Patent Application
20230408230
Since the invention of dynamite, we no longer detonate explosives with fire, but instead by percussion, triggered by the prior detonation of a high explosive (shock wave). These methods are what we call “initiation systems”.
In 1863 Alfred Nobel patented his first initiator, consisting of a piece of wood filled with black powder. He later invented a device with a copper capsule system inside which contained mercury fulminate. Afterwards, an extensive range of detonators were developed, whose characteristics varied according to the circumstances in which they were to be applied (mining, quarrying, construction) and the type of dynamite with which they were to be used.
Another initiation system is the safety wick or slow wick system This consists of black powder wrapped in textile yarns, with a braiding machine, then waterproofed with a layer of asphalt and covered with a new layer of textile or wax. From 1936 to date, a detonating cord has been used, which is a flexible, waterproof rope containing explosive inside, originally trinitrotoluene (TNT) and penthrite.
The mass application of explosives in the more than 140-year history of the industry has been due to their low cost and accessibility. There have been technological advances in mixing and detonators. Currently, the explosive technology used consists of the use of a blasting agent, “Anfo” (Ammonium Nitrate-Fuel Oil), a mixture of ammonium nitrate and petroleum that does not produce toxic gases and has an adequate power according to the type of rock to be fragmented.
A technical problem with rock blasting is its effect on the rock in the vicinity, as it can produce intense fragmentation and disruption of the integrity of the rock in the surrounding area if the blasting or drilling systems are incorrect. The damage would be greater if the blasting energy were transmitted to a more remote area, destabilizing the mine structures.
The results of a blast depend on factors such as: rock type, stress regime, structural geology, and the presence of water. Appropriate measures to minimize blast damage include: proper choice of explosive, use of perimeter blasting techniques such as pre-division blasting (closely spaced parallel holes that define the perimeter of the excavation), decoupling charges (the diameter of the explosive is smaller than that of the blast hole), delay time and stop drills.
Some references with respect to electronic detonator developments may include European patent DE 102005052578.4 describing a method and a system for assigning a delay time to an electronic delay detonator, where the detonator includes an information register (24), in which the desired delay time value, supplied by the controller, is recorded, where subsequently, during a predetermined time period (t), the contents of the information register (24) are repetitively added to a counter register (26), where the contents are accumulated, where after a division of the contents of the counter register over the calibration time, the contents of the counter register (26) are subsequently counted backwards using the same oscillator (18) controlling the accumulation process. The present invention allows the value of the delay time supplied by the controller to be accurately matched, using an oscillator (18) with low precision and no feedback from the trigger (12) to the controller.
Another development with respect to electronic detonators refers to U.S. Patent US 61/108,277 describing a detonator that incorporates a high voltage switch, an initiator and an initiation pellet, with the detonator also comprising a low- to high-voltage detonation group connected to the switch and the initiator, such that the detonator includes a high voltage power source and an initiator in one integrated package. The detonator may also include a power cord and communications devices, a microprocessor, tracking and/or locating technologies, such as rfid, gps, etc., and a pellet of an explosive or combination of explosives. The combination explosive pellet has a first explosive with a first-impact energy, and a secondary high explosive in the exit pellet with a second impact energy greater than the impact energy of the first explosive. Systems for quick and easy deployment of one or more detonators in the field are also provided.
Within the large universe of patents on electronic detonators, we can mention patents EP1105693/WO0009967 describing a method and apparatus for setting up a blasting arrangement by loading at least one detonator in each of the numerous blasting holes, placing explosive material in each blasting hole, connecting to a trunk line a control unit with a power source incapable of firing the detonators, sequentially connecting the detonators—using respective bypass lines—to the trunk line and leaving each detonator connected to the trunk line. The device further includes means for receiving and storing in memory the identity data of each detonator, means for causing a signal to be generated to test the integrity of the detonator/trunk line connection and the functionality of the detonator, and being able to assign a predetermined time delay to each detonator to be stored in memory.
One may also mention patents E12706936/EP2678633/ES2540573T3, which disclose an explosive detonator system for detonating a charge of explosive whereby, during use, arranged in a detonation relation, the detonator system comprising a detonator, which includes a detonator capsule; a detonation circuit within the detonator capsule, including the detonation circuit comprising a conductive path; an igniter head within the detonator capsule, the igniter head comprising at least two spatially separated conductive electrodes and a resistive bridge connecting the space between the electrodes, integrating the igniter head with the detonation circuit such that the conductive path passes along both the electrodes and the resistive bridge; included in a charge signal communicated to the detonator during use, such that exposure to the charge property charges the voltage source, thereby rendering the voltage source capable of causing a potential difference between the electrodes at least to equal the breakdown voltage of the resistive bridge; and a shock tube which is provided, during use, in close proximity of initiation to the detonator and is capable of providing a shock signal as at least part of the charge signal, the shock tube comprising a hollow elongated body, within which is provided a shock tube explosive, whose detonation provides the shock signal, wherein the charging property includes at least a charging light pulse and, optionally, a charging temperature, a charging pressure and/or a charging radio frequency of the charging signal, making the chargeable voltage source therefore sensitive to the charging light pulse and, optionally, to either the charging temperature, the charging pressure and the charging radio frequency, or their conjunction; and whereby a photoluminescent chemical is provided within the hollow elongated body supplying the charging light pulse.
On the other hand, patent U.S. Pat. No. 6,173,651B1 discloses a detonator control method equipped with an electronic ignition module. Each module is associated with specific parameters including at least one identification parameter and a burst delay time, and includes a trigger capacitor and a rudimentary internal clock. The modules can communicate with a trigger control unit equipped with a reference time base. Identification parameters are stored in the modules via a programming unit; specific parameters are stored in the trigger control unit; for each successive module, their internal clock is calibrated by the trigger control unit and the associated delay time is sent to the module; the modules are commanded to charge the trigger capacitors and a trigger command is sent to the modules via the trigger control unit, which triggers an eventual reset of the internal clocks as well as a trigger sequence.
A second US patent, U.S. Pat. No. 4,674,047 A1 discloses a detonation system for use with electric power supply that has a user-operable firing console for selectively transmitting unit identification information, firing delay time information, and selections from a set of commands including Exit, Delay, Fire (Time), Abort, Power On (Arm), Entry, and Store. The console displays the responses or digested information from the responses of the electrical delay triggers to the commands. Detonators have an explosive, a capacitor to store energy from the supply to activate the explosive, a circuit to charge the capacitor from the supply and transfer energy from the capacitor to the explosive in response to first and second signals caused by the commands. Each detonator can be programmed with a unique identification number and delay time. The time base for each detonator can be compensated, avoiding time base errors preventing a correct delay. The security code circuits and software are described in such a way that each detonator can only be activated by authorized users.
However, their use has not been without problems; the vibration caused by the explosives restricts their use in urban areas and damages the environment, causing the risk of scour and forcing the company to incur the cost of repairing the surrounding geology. On the other hand, in commercial mining operations, the conventional explosive fragmentation method results in a jumbled mixture of inert material with the ore, which must be removed from the mine, crushed and processed; this, added to the depletion and lowering of ore grades worldwide, has implied an increase in tailings removal, and the way in which this is treated is key, where stages such as fragmentation can affect a company's productivity and profitability. The importance of the concept of controlled fragmentation in mining transpires from this.
The use of alternative fast expanding metallic mixtures, which do not contain dynamite, dates from after World War II, and the technological advances are mainly reflected in the Korean patent No. 10-0213577, consisting of a fast expanding metallic mixture with ignition points up to 700° C., with applications in the mining and civil works industry and whose main characteristic is a higher and shorter (time) expansion force when compared to dynamite.
The fast-expanding metallic mixture corresponds to a chemical mixture composed of metal salts and powders, available in multiple formulations on the market, according to the following examples:
2Fe(NO3)2+12Mn; Patent No. 10-0213577 Formula 1:
Fe(NO3)2+3CuO+6Al; Patent No. 10-0213577 Formula 2:
3Ca(NO3)2+Fe3O4+12Al; Patent No. 10-0213577 Formula 3:
Fe2O3+4Na2O+BaCO3+4Mg; Patent No. 10-0213577 Formula 4:
Fe2O3+NaSO4+4Al; Patent No. 10-0213577 Formula 5:
2Na2O+Fe2O3+3CuO+2Al; Patent No. 10-0213577 Formula 6:
2NaClO4+2CuO+2Al; Patent No. 10-0213577 Formula 7:
A formula, as identified in Formula 1 above, subjected to temperatures of 1,500° C., (Note that the ignition temperature varies according to the ratios of salt and metal powder mixture in each Formula), triggers the following thermochemical reaction of its components:
2Fe (NO3)3+12Mn→2FeO+4Mn3O4+3N2
The metal salt allows the oxidation of the metal powder, the heat generated in the oxidation process of extremely high temperatures (3,000° C.-30,000° C.) is caused instantaneously, releasing a large amount of thermal energy, converting the iron (Fe) and manganese oxide (Mn3O4) products into vaporized gases that expand rapidly; the expanded product by vaporization is changed to a solid state, thus stopping the expansion reaction. When the outcome occurs in a confined space, the release of expansive energy is what finally allows the rock to fracture due to the high pressures reached (5,000-20,000 Atm).
As in the formula stated above (Formula 1), metal nitrates are the most preferable; however, a rapidly expanding metal mixture can also be composed of other metal salts such as: metal oxides, metal hydroxides, metal carbonates, metal sulfates and metal perchlorates. This metallic salt can be used on its own or combined with others. In particular, metal nitrates can be further added with at least one metal salt selected from metal oxides, metal hydroxides, sulfates and metal perchlorates, to control the temperature required for the onset of oxidation and the period of time required for oxidation.
As in the formula noted above (Formula 1), the metal powder is preferably selected from the group consisting of aluminum powder (Al), sodium powder (Na), potassium powder (K), lithium powder (Li), magnesium powder (Mg), calcium powder (Ca), Manganese powder (Mn), Barium powder (Ba), Chromium powder (Cr), silicon powder (Si) and combinations thereof.
The proportions used to compose the mixture of metallic salts and powdered metal are defined according to the ratio of amounts of oxygen caused by the metallic salts and the amounts of oxygen required to oxidize the powdered metal. This ratio of generation versus requirement provides a ratio based on molecular weights calculated from chemical formulas.
The composition, function, and preparation process of a rapidly expanding metallic mixture is not part of the subject matter of this paper. There are various public domain documents or patents with this information.
The high temperature condition required to trigger the oxidation reaction of a rapidly expanding metal mixture can be achieved through various methods. However, one of the most widely used methods today consists of that described in patent EP 1 306 642 B1, in which a capsule structure is provided for a rapidly expanding metallic mixture, in which high-voltage arc discharge heat (causing temperatures of thousands of degrees), is used as the heat source.
As described in patent EP 1 306 642 B1, the capsule for a rapidly expanding metallic mixture comprises an outer casing made of an insulating material, with the rapidly expanding mixture contained in the outer casing, and two power supply rods extending outwardly from both ends of the outer casing. Two main firing electrodes are provided to induce arc discharge at the inner ends of the two power supply rods. The two main firing electrodes induce an arc discharge between them when high voltage is applied to them.
When a high voltage of 2 kV or more is applied to the two feed rods, an arc discharge is induced between two trigger electrodes, instantly causing a high temperature of approximately 2,000° C. or more at the positions around the positive and negative trigger electrodes. The voltage requirement varies according to the distance of the electrodes, namely, when the firing electrodes are spaced at intervals of 200 mm or more, a voltage of 6-7 kV or more needs to be applied to the trigger electrodes to induce an effective arc discharge between the electrodes. Nevertheless, in the case of activating trigger electrodes spaced at intervals of 100 mm or less, an equally effective arc discharge between the electrodes is induced, even with the use of a voltage of 3-4 kV. It is understood that the voltage level has a slight variation depending on other conditions, such as type of resistance wires, as well as types and concentrations of electrolytes.
The disadvantages of this method lie mainly in the high voltage requirement necessary to achieve the high temperature that triggers the chemical reaction and the lack of a testing system to reduce or eliminate the existence of non-activated capsules.
The use of patent EP 1 306 642 B1 could be reduced in projects requiring a large volume of non-explosive fragmentation, because the high voltage required for the activation of the necessary chemical reaction would be a limiting factor for the number of capsules in the field. For example, if 10 boreholes are required in a given project, using the system of patent EP 1 306 642 B1, it would be necessary to connect 10 initiators in series; since the voltage requirement to activate the chemical reaction is 2 kV per capsule, the generator equipment must supply the system with 20 kV.
This development aims to provide a non-explosive (deflagrating) programmable electronic initiator for a rapidly expanding metallic mixture (such as plasma and/or explosives of different category), which seeks to provide a solution to the above technical problems in rock fragmentation; to achieve the high temperature necessary to activate a rapidly expanding metallic mixture with a very low voltage requirement; to improve the rates of non-activated charges (left behind firings) with an effective test system; to provide work continuity, increase productivity and safety in the processes related to rock fragmentation with a programmed delay system in each initiator.
This development is related to a non-explosive programmable electronic initiator, whose purpose is to activate the chemical reaction of a rapidly expanding metallic mixture with a temperature higher than 1,000° C.; whose main characteristics are: a low voltage requirement (less than 35 V), which allows a large number of capsules in the mesh to be fragmented (more than 400 capsules); a delay system (from 1 to 64,000 milliseconds), which allows greater precision and control of the fragmentation; a testing system that allows validation of the circuit prior to ignition, which eliminates the existence of non-activated capsules.
These differentiating characteristics individually and jointly improve the industrial applicability of a rapidly expanding metallic mixture in non-explosive rock fragmentation, significantly increasing production (fragmented m3), safety and control with a minimum energy requirement.
By way of summary, the technical problems that the present development aims to solve are based on delay, voltage, temperature, and multi-testing.
In general, fast-expanding metallic mixtures, unlike other similar products, do not have any explosive components. However, its use allows obtaining similar results and with important advantages such as a significant reduction of handling and transportation risks, due to the great stability of the chemical mixture against shocks, friction, pressure and high temperatures; significant reduction of risks of work accidents; operational continuity due to the fact that the evacuation of people and equipment is minimal in a radius close to the blasting area; lower environmental impact due to the minimum levels of vibration, noise, shrapnel and no toxic gases.
However, their use has been limited by some features of the current patents available on the market, which are outlined below:
a. Delay
A technical problem with rock blasting is its effect on the rock in the vicinity, as it can produce intense fragmentation and disruption of the integrity of the rock in the surrounding area if the blasting or drilling systems are incorrect. One of the measures used to minimize the environmental impact caused by high vibrations and improve the safety of field work is the time delay in blasting.
In this development, each initiator has a programmable delay system, which allows to program in advance and individually the required delay period according to the blasting schedule. Each Non-Explosive Programmable Electronic Initiator [07] can be programmed with a delay time in the range of 1 millisecond to 64,000 milliseconds.
In the case of patent EP 1 306 642 B1, another initiator of rapidly expanding metallic mixtures, the lack of delay time is observed.
Some electronic initiators for explosives have a programmable delay time, which is the case of patent U.S. Pat. No. 6,173,651 (14,000 milliseconds, patent EP 1105693 B1, WO 0009967 A1 (according to patent 3,000 milliseconds, however, according to data sheet 30,000 milliseconds) whose initiators have the longest delay time known to date.
Another characteristic of a longer delay time would be the increase in productivity, since a greater number of drillings could be carried out for a more extensive blasting, maintaining a safe level with respect to vibrations and without having to re-equip the work area and reducing the workers' exposure to risk.
b. Voltage
In accordance with the provisions of the Regulation on High-Current Electrical Systems in Chile, high-voltage, high-current electrical systems or systems with rated voltages above 1,000V with a maximum of 220,000V are considered high voltage electrical systems and require a series of safety measures, while low voltage systems include systems or installations with rated voltages of between 100V and 1,000V. Understand the direct effect of this point on occupational safety and the potential effect of any accident related to the life and health of the workers involved.
A key feature of the present development is to deliver the voltage necessary to activate a single (or more than one) Programmable Non-Explosive Electronic Initiator [07] for a rapidly expanding metallic mixture. A voltage between 24V and 35V is required to activate the Programmable Non-Explosive Electronic Initiator [07]. The same voltage is required to activate one hundred (100) or more units of Non-Explosive Programmable Electronic Initiator(s) [07]: 24V and 35V. The voltage requirement does not vary either by distance between activation electrodes or by electronic initiator units arranged in the line. This is because the connection of each Programmable Non-Explosive Electronic Initiator [07] to the line is in parallel.
In patent EP 1 306 642 B1, which considers an initiator for the activation of a rapidly expanding metallic mixture, each initiator requires 2,000V or more. Similarly, this patent points out different voltage requirements according to the distance between the activation electrodes: when the activation electrodes are separated by 200 mm or more, the voltage requirement for activation is between 6,000V and 7,000V; when the activation electrodes are separated by 100 mm or more, the voltage requirement for activation is between 3,000V and 4,000V. Because the connection of the initiators to the line is in series, the applied voltage is divided by the number of initiators on the line, so the voltage requirement of each initiator arranged in a blast increases the total voltage requirement.
In a concrete example, if 100 initiators were required to be used on a site, it is estimated that 200,000V (or more) would be required for initiators of the type proposed in patent EP 1 306 642 B1 to activate all the initiators. This requirement is impractical both in the mining industry and in civil works. If the same site were to use the Programmable Non-Explosive Electronic Initiators [07] proposed in this development, the total voltage requirement would be between 24V to 35V.
In other cases, the use of pyrotechnic drops or explosive tallow has been a solution to avoid the high voltage requirement, even if this means losing several of the qualities of the rapidly expanding metallic mixture, such as: reduced handling and transportation risks, reduced risk of occupational accidents, and operational continuity.
Other initiators such as, U.S. Pat. No. 5,171,935 A, CA 2 339 167 C, U.S. Pat. No. 8,746,144 B2, use a low voltage, however, they do not seek to reach a high temperature, a basic requirement for activation of the rapidly expanding metallic mixture.
c. Temperature
The voltage factor is also related to the high temperature condition required to trigger the oxidation reaction of a rapidly expanding metal mixture, as this can be achieved by various methods. In patent EP 1 306 642 B1, the high temperatures required (700° C. or more) for activation of the rapidly expanding metallic mixture is achieved by the high temperatures (thousands of degrees) caused by the electric arc from the high voltaic discharge; it is so large that it spares the existing filament in some instances.
In this development, the required high temperature (1,000° C. or more) is reached through the controlled discharge of Capacitor C7 [21] on the filament [30], leading it to glow for as long as needed, reaching the required temperature to activate the first rapidly expanding metallic mixture [13], which serves as a non-explosive tallow. Once the rapidly expanding metallic mixture [13] is activated, the necessary temperature (1,200° C. or more) is reached to activate the second rapidly expanding metallic mixture [15].
The higher temperature requirement (1,000° C.) for activating a rapidly expanding metallic mixture [13] in Programmable Non-Explosive Electronic Initiators [07] has a direct positive impact in terms of safety, both in terms of handling and transport.
d. Multi-Test System
It should also be noted that one of the key precautions to be taken in blasting, once the shot has been fired, is to examine the intervened area for the presence of non-activated initiators (misfire). An uncontrolled explosion could seriously endanger the integrity of the workers, so a team prepared for this purpose must guard the site and eliminate these shots, following the instructions established in the specific site's work procedures. Such is the seriousness of non-activated initiators (misfire), which are regulated by law in some countries.
The process requires, among other things, the presence of a supervisor during the entire operation, ensuring that the compromised area is cleared, removing unrelated workers and equipment, and using the minimum personnel necessary for this activity, thus reducing the number of people exposed to highly critical conditions.
This development involves a test system that avoids non-activated initiators (misfire) from taking place once the blasting is finished, reducing the labor risk in the field, allowing a safe execution and improving compliance with the blasting program.
By means of multiple internal diagnostics, the Programmable Non-Explosive Electronic Initiators [07] of the present development warn of specific errors:
With the respective software diagnostics, the necessary information is obtained, ensuring the correct operation of the Programmable Non-Explosive Electronic Initiator(s) [07].
In the case of patent EP 1 306 642 B1, another initiator of rapidly expanding metallic mixtures, the lack of a test system may be observed.
Other patents such as WO 0009967 may include a test system focused on their needs; however, such systems lack a verification of the system's frequency shift.
The frequency change verification becomes essential to ensure the correct state prior to the activation of the “sleep” functionality of Microprocessor IC1 [07], which is directly related to the low voltage requirement and the achievement of the maximum delay time of 64,000 milliseconds.
Given all of the above, this development proposes advances that would allow the safe and productive, widespread use of the rapidly expanding metallic mixture.
It must be stated that this development is not limited to the particular methodology, compounds, materials, manufacturing techniques, uses, and applications described herein, as these may vary. It should also be understood that the terminology employed herein is used for the sole purpose of describing a particular embodiment, and is not intended to limit the perspective and potential of this invention.
It should be noted that in the use and method, here, in the statement of claims and throughout the text, the singular does not exclude the plural, unless the context clearly implies so. So, for example, the reference to a “use or method” is a reference to one or more uses or methods and includes equivalents known to those familiar with the subject matter (the art). Similarly, as a further example, the reference to “a step”, “a stage” or “a mode” is a reference to one or more steps, stages, or modes and may include implied and/or upcoming sub-steps, stages, or modes.
All conjunctions used should be understood in the least restrictive and most inclusive sense possible. Thus, for example, the conjunction “or” should be understood in its orthodox logical sense, and not as an “or excluding”, unless the context or the text expressly requires or indicates it. The structures, materials, and/or elements described must be understood to also refer to those functionally equivalent in order to avoid endless, exhaustive enumerations.
Expressions used to indicate approximations or conceptualizations should be understood as such, unless the context dictates a different interpretation.
All technical and/or scientific names and terms used herein have the common meaning given to them by an ordinary person qualified in these matters, unless expressly indicated otherwise.
Methods, techniques, elements, compounds, and compositions are described, although similar and/or equivalent methods, techniques, compounds, and compositions to those described may be used or preferred in practice and/or when testing this invention.
All patents and other publications are incorporated as references, for the purpose of describing and/or reporting, for example, methodologies described in such publications, which may be useful in connection with this invention.
These publications are included only for the information they contain prior to the filing date of this patent application.
Nothing in this regard should be considered an admission or acceptance, rejection or exclusion, of the entitlement of the authors/inventors to be considered as such, or of such publications being backdated pursuant to previous ones, or for any other reason.
In order to provide clarity to the present development, the following concepts will be defined:
In order to operate the present development, a Command Equipment (Console or Master) [01], with the capacity to convert the serial communication into a communication protocol based on Voltage Modulation [03] through a Communication and Power Line (parallel lines) [02A and 02B], a connector [04] that connects said parallel lines with the Non Explosive Programmable Electronic Initiator(s) [07] (
Other general requirements for the operation of the Command Equipment [01] consist of, but are not limited to: external power supply (preferably 24V to 36V battery), microprocessor, Micro SD card, Bluetooth system, RFID reader [06], wireless transmission and display with keypad.
The operation of the development also requires a Communication and Power Line [02A and 02B] consisting of two parallel copper wires, each with a diameter greater than 0.5 millimeters, and a resistance of less than 36 ohm per kilometer. These cables play an essential role, and when used according to the instructions in Table I, they ensure both the reliability in the transmission of Voltage Modulation [03] and communication protocol (
For this development to have a practical use (in the field), it should consider the use of a portion of two rapidly expanding metallic mixtures [13] and [15] (PLASMA) with a formulation similar to the ones mentioned earlier, such as:
2Fe(NO3)2+12Mn; Patent No. 10-0213577 Formula 1:
Fe(NO3)2+3CuO+6Al; Patent No. 10-0213577 Formula 2:
3Ca(NO3)2+Fe3O4+12Al; Patent No. 10-0213577 Formula 3:
Fe2O3+4Na2O+BaCO3+4Mg; Patent No. 10-0213577 Formula 4:
Fe2O3+NaSO4+4Al; Patent No. 10-0213577 Formula 5:
2Na2O+Fe2O3+3CuO+2Al; Patent No. 10-0213577 Formula 6:
2NaClO4+2CuO+2Al; Patent No. 10-0213577 Formula 7:
It should be understood that, for the use of the present development, the rapidly expanding metal mixtures [13] and [15] will be activated and the expected exothermic reaction will be triggered.
The present development consists of a Programmable Non-Explosive Electronic Initiator [07], comprising a capsule with two types of rapidly expanding metallic mixture [13] and [15] that allows coupling to a container tube or sleeve [16] and a sealing plug [17](
An algorithm is programmed and saved in Microprocessor IC1 [28] in order to give functionality to the system. By means of functions and commands, this algorithm recognizes from the input signal, reads input data concerning the oscillator frequency (
Each Non-Explosive Programmable Electronic Initiator [07] has a unique and unrepeatable identification (ID), which is recorded at the factory and matches the internal code of the external RFID card [05]. By means of an algorithm, the Command Equipment [01] captures this ID through the serial port via Bluetooth through the RFID reader equipment (Logger) [06] (
The Programmable Non-Explosive Electronic Initiator [07], has a Microprocessor IC1 [28] (
With the Command Equipment [01] activated, and all requirements for operation in order, the Communication and Power Line [02A and 02B] is activated, initiating the Voltage Modulation [03] and the communication protocol (
It is to be understood that the abovementioned Voltage Modulation [03] (
A bidirectional communication protocol (
Data is sent at a communication rate equivalent to 2400 baud from the Command Equipment [01] via the Communication and Power Line [02A and 02B] and is received by the Programmable Non-Explosive Electronic Initiator(s) [07] (
Data is sent over the Communication and Power Line [02A and 02B] from the Programmable Non-Explosive Electronic Initiator(s) [07] and received by the Command Equipment [01] (
The Programmable Non-Explosive Electronic Initiator input [07], comprises a diode D1 and a Voltage Rectifier D2 [18] (
A Voltage Regulator IC2 [20] receives the voltage from 24V to 35V and the rectified current (DC). This IC2 Voltage Regulator regulates the initial voltage to 5V (
For bidirectional communication between the Command Equipment [01] and the Programmable Non-Explosive Electronic Initiator [07], two voltage divider resistors R1 and R2 [24] are connected to the system input of the Programmable Non-Explosive Electronic Initiator [07], which lower the voltage from 24V-35V to 5V, thus adjusting to the operating level of the Microprocessor IC1 [28]. In addition, R1 operates with resistance between 90 and 170 kOhm, preferably 110 kOhm, preferably 120 kOhm and preferably 130 kOhm and R2 operates with resistance between 15 kOhm and 25 kOhm, preferably 110 kOhm, preferably 120 kOhm and preferably 130 kOhm. The square wave with the data is then transmitted from the Command Unit [01] to the INT/IO PORT input pin [41] (
In response, the Microprocessor IC1 [28] through the EUSART transmission block [28E] (
Two diodes D4 and D5 are connected to the 5V voltage input [19]. In this stage of the circuit, the input voltage 5V is reduced to 3.6V, which is necessary to operate the IC1 microprocessor [28]. Diodes D4 and D5 [19] suppress transient currents and prevent current leakage.
A 6.3V, 470 pF Capacitor C4 [19], connected to diodes D4 and D5 [19] and to the voltage input of Microprocessor IC1 [28], keeps the 3.6V input voltage stable. Capacitor C4 [19] is an energy reservoir that is continuously charged. It is essential to note that this device will be the power source for Microprocessor IC1 [28] and will keep it active for up to 64,000 milliseconds, once the Communication and Power Line [02A and 02B] is interrupted. The discharge time of this capacitor must be greater than the programmed delay time; this point is addressed in more depth when describing the operation of the External Oscillator [25] (
Two resistors R6 and R7 [26] divide the voltage between Ground (GND), Filament [30] and Capacitor C7 [08] (
As a safety measure, a transistor T4 [22] (
Filament [30] is connected to Capacitor C7 [21] (initial charge 0V) and transistor T2 [27]. Once the Trigger Command (Command 7) has been activated, the I/O PORT pin C5 [28B] (
Resistor R9 [21] limits the input current to a value ranging between 2 and 3 milliamps, this allows a slow charging of Capacitor C7 [21] and a minimum current consumption. Diode D3 [21] prevents current leakage from Capacitor C7 [21].
The resulting analog voltage between resistors R6 and R7 [26] (DC) enters the ADC/AN pin [28C] (
The arrangement of the elements, together with the processes and commands activated by means of an algorithm, allow for establishing a Test System based on the values provided by the sensor configured on the ADC/AN pin [42] (
The Test System is powered by the sensor data configured on the ADC/AN pin [42](
The Performance Test System is activated via Command 3 (described below) and consists of the following tests:
Microprocessor IC1 [28], which has an internal oscillator of preferably 16 MHz [28A](
This development includes a 32 kHz External Oscillator Q1 [25] (
The Filament [30] (
In
An External Oscillator Q1 [25] of lower frequency than the internal oscillator of the Microprocessor IC1 [28], emits pulses that are read by TIMER1 [37] (
Using an algorithm, the operation of the External Oscillator Q1 [25] is automatically enabled once the internal oscillator of the Microprocessor IC1 [28] becomes disabled.
When the internal oscillator of Microprocessor IC1 [28] is turned off and the External Oscillator Q1 [25] starts to operate, the TIMER1 [37] (
The delay time is defined in the field and before issuing the Fire command. The defined delay time is programmed in the Programmable Non-Explosive Electronic Initiator(s) [07] through the Command Set [01]. The data related to the programmed delay time is stored in the non-volatile EEPROM memory of the Microprocessor IC1 [28] of each Programmable Non-Explosive Electronic Initiator [07].
The delay time of each Programmable Non-Explosive Electronic Initiator [07] is limited by three characteristics associated with different functionalities.
Capacitor C4 [19] (
The 32 kHz External Oscillator Q1 [25] [25] emits 32,000 pulses per second, these are counted by TIMER1 [37] (
Microprocessor IC1 [28] has a sleep mode function, which is activated by an instruction. When entering sleep mode, the TIMER1 oscillator of Microprocessor IC1 [37] is not affected and the peripherals operating from it can continue to operate in sleep mode (
Due to the low power consumption obtained with the activation of the External Oscillator Q1 [25], we may achieve a sleep state of more than 64,000 milliseconds due to the activation of the “sleep” function of the Microprocessor IC1 [28] and the autonomy of the Capacitor C4 [19].
All in all, the programmable delay time of each Programmable Non-Explosive Electronic Initiator [07] is limited to a range between 1 and 64,000 milliseconds.
When the programmed delay time (Command 2) is reached, Microprocessor IC1 [28] is interrupted internally, deactivating the “sleep” mode and activating the other functions required to complete the final firing.
The activation of Fire (Command 6), causes the following actions:
Once the delay time has elapsed, Capacitor C7 [21] is enabled; at that moment Transistor T2 (NPN) [27] and its Resistor R8 [27] are enabled to discharge all the energy accumulated in Capacitor C7 [21] on the Filament [30] (
The Filament [30] then begins to glow, generating a temperature of more than 1,200° C. due to the capacitance of Capacitor C7 [21] of between 24V and 35 V and a current of approximately 0.250 A, which activates the Rapidly Expanding Metal Mixture [13] (
The Programmable Non-Explosive Electronic Initiator [07] performs the processes described below:
The sensor [28C] (
Using an algorithm, the IC1 microprocessor sensor [28] reads the initial charge state of Capacitor C7 [21]. The first sampling is expected to be less than 1V (Command 3).
Command 1: Records the ID, the RFID identifier code [05], in the non-volatile EEPROM memory of the IC1 microprocessor [28], which uniquely identifies a Programmable Non-Explosive Electronic Initiator [07].
Command 2: It saves in the non-volatile EEPROM memory of Microprocessor IC1 [28] the programmed delay time, which varies between 1 millisecond and 64,000 milliseconds.
Command 3: Query ID. It diagnoses the current functionality, except for Command 7 (Fire).
At this point, the user must repeat Command 3 to check again that the system is operational including the status change of Capacitor C7 [21].
Command 6: Safety measure in case of any failure. If Command 5 fails, it responds with an error code, Transistor T4 [22] is activated, connecting Capacitor C7 [21] to ground and discharging it.
Command 7: Fire. Disables external interrupts of the microprocessor [28]. Disables the charging of Capacitor C7 [21]. TIMER1 is loaded with the data related to the delay time. Activates the “sleep” function of Microprocessor IC1 [21]. Enables countdown of the assigned delay time of the Programmable Non-Explosive Electronic Initiator [07]. At the end of the countdown assigned to the programmed delay time, activates Capacitor C7 [21]. Activates I/O output PORT C5 [40] (
In order to better describe the figures, below is a list of all the items shown in them:
This figure shows two diagrams, A and B, where the left diagram or
This figure shows three diagrams A, B and C, representing voltage waves, where
This figure shows three diagrams: A, B and C, where the first two show a schematic description of the Printed Circuit Board (PCB). Diagram C shows a detail of the interaction between Filament [12] coated with a Rapidly Expanding Metal Mixture [13], inserted in a Shrink Sleeve [14], where the Shrink Sleeve [14] holds together the Filament [12] with the Rapidly Expanding Metal Mixture [13], and where the Shrink Sleeve [14] is contained by a Capsule container [16] which in turn contains another amount of a Rapidly Expanding Metal Mixture [15].
This figure shows a schematic circuit of the Programmable Non-Explosive Electronic Initiator [07].
This figure shows a specification of the CPU programming and feedback [28F] described in the schematic circuit of the Programmable Non-Explosive Electronic Initiator [07].
This figure is a detailed representation of the dynamics generated in the Clock Source Block [28A].
This figure shows a diagram of how the square wave with the data is transmitted from the Command Unit [01] to the INT/IO PORT input pin [41] and 10 output ports [28B](for charging Capacitor C7 [38], for discharging Capacitor C7 [39], for firing and discharging Capacitor C7 in Filament [30] [40]) (
This figure shows a diagram of the analog information received by the Microprocessor IC1 [28] through the ADC/AN pin [42] (
This figure shows a diagram of how Microprocessor IC1 [28], through the USART transmission block pin TX [43] (
In order to calculate the ignition temperature of the primary metallic mixture, the following mixture Al+Fe2O3+NaNO3(Aluminum+Iron Oxide+Sodium Nitrate) was used, using the following equations:
The resistivity of a metal (p) increases with temperature; this relationship is determined by the following equation:
ρ(T)=ρo (1+α(ΔT)) (Equation No. 1)
Where:
In turn, the resistivity of a metal is directly proportional to the resistance of the metal, the relationship between the two is given by:
R=ρ*L/A (Equation No. 2)
Where:
Knowing the values at an ambient temperature of To=20° C. and Ro at that temperature equal to 10.5Ω, the temperature coefficient (a) of tungsten is α=0.0045. If we do an experimental calculation of the RF resistance of tungsten, we get, when applying a voltage of V=24 V (volts), 20V calculated by the voltage drop and an electric current I=0.100 A (amperes) and substituting the resistivity (ρ) of equation No. 2 in equation No. 1.
ρ=R*A/L (Equation No. 2)
(R*A(T))/L=(R0*A(1+α(TF−To)))/L (Equation No. 1)
Multiplying both members by L/A
(R*A(T)*L)*(L/A)=(Ro*A(1+α(TF−To)))*(L/A)
R(T)=Ro(1+α(TF−To)) (Equation No. 3)
Determining variable TF from equation No. 3:
T
F=((RF/Ro)−1)/α+To (Equation No. 4)
Calculating experimentally with the discharge of capacitor C7 gives us a final resistance per temperature difference of 90 ohm, substituting these values in equation No. 4:
T
F=((90Ω/10.5Ω)−1)/0.0045+20° C.
Based on the results obtained, it is concluded that at an ambient temperature of 20° C., the filament temperature for igniting the first rapidly expanding metallic mixture [13] is approximately 1,702° C.
Considering that the melting point of tungsten metal is 3,422° C., it is concluded that the filament will not break before activating the first rapidly expanding metallic mixture [13].
Since the filament incandescence has a time limit [30], in an environment exposed to oxygen (no vacuum) its consumption is inevitable. Once the discharge of capacitor C7 [31a] is activated, the minimum average glow period of filament [30] is greater than 100 milliseconds, enough time for the glow of filament [30] to activate the first rapidly expanding metallic mixture [13].
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CL2020/050144 | 10/29/2020 | WO |
