Patent Application
20210223018
The invention relates to a mining vehicle for delivering a detonation device for initiating an explosion of an explosives material into a hole in a floor of a mine.
The invention also relates to a method of using the mining vehicle within a mine for the purpose described in the preceding paragraph.
The drill and blast process used on many mining sites involves a number of operations that are carried out by mine personnel on a pit floor.
There are safety risks for the mine personnel when on a pit floor. The safety risks are compounded when mining operations are carried out in extreme conditions, such as in mines located in very hot and in very cold regions. The safety risks are also compounded when mining in and around pits where there is geothermal activity and the surface of the pit floor is hot and unstable and the pit temperature increases with depth. When mining in these pits, by way of example there can be unpredictable geysers in drilled holes, with hot water/steam being projected upwardly.
One of the operations in a drill and blast process involves locating detonation devices into blast holes in the pit floor. The detonation devices typically contain a small charge of explosive material. The purpose of the detonation devices is to initiate an explosion of explosives material, such as a bulk explosives material, in the blast hole. Each detonation device is hereinafter referred to as a “booster”.
More specifically, the term “booster” as used herein is understood to refer to a detonation device typically containing a small charge of explosive material that can be located in a blast hole for the purpose of initiating an explosion of an explosive, such as a bulk explosives material, in the blast hole. In a situation where the booster contains an explosive material, the explosive material may be a charge of liquid or solid explosive of a fixed quantity that is calculated to detonate a fixed volume of explosive emulsion (or other suitable form of explosive formulation) within a primed hole in the pit floor.
The present invention is concerned with minimising the safety risks associated with locating boosters in blast holes in a pit floor.
The above description is not an admission of the common general knowledge in Australia and elsewhere.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods, vehicles and other equipment and devices, and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, a limited number of the exemplary methods, vehicles and other equipment and devices, and materials are described herein.
In broad terms, the invention provides an explosives delivery vehicle for delivering a booster for initiating an explosion of an explosives material in a hole in a floor of a pit to an operative depth in the hole, the vehicle comprising:
The vehicle makes it possible to insert boosters into holes without an operator having to stand on the floor of the pit. The vehicle has other advantages that are described below.
The loading assembly may comprise a pusher element for applying a downwardly-acting force to move the booster into the hole to the operative depth.
The downwardly acting force may be a downward force applied via the pusher element to the booster to drive the booster into the hole.
The downwardly acting force may be a consequence of the weight of the pusher element and the booster. In other words, the downwardly acting force may be a gravitational force pulling the booster into the hole to the operative depth.
The booster and the pusher element may have complementary formations that allow the booster to receive and locate the pusher element.
The complementary formations may allow the pusher element to be releasably coupled to the booster.
The complementary formations may allow the pusher element to be positively docked with the booster.
The complementary formations may include a recess in an upper end of the booster that can receive the pusher element.
The pusher element may be formed to (a) couple the booster and the pusher element together to support the booster while the pusher element, in use, moves the booster downwardly into the hole to the operative depth in the hole and (b) release the booster from the pusher element when the booster is at the operative depth so that the pusher element can be withdrawn from the hole.
The delivery assembly may be any suitable assembly for transporting the booster from the storage assembly to the loading assembly.
For example, the delivery assembly may comprise an arm that is moveable to transport the booster from the storage assembly to the loading assembly.
The arm may comprise a retaining member, for example in the form of grippers, that can engage and retain the booster while the arm, in use, transports the booster from the booster storage assembly to the booster delivery position and can release the booster when the booster is at the booster delivery position.
The arm may be pivotally mounted for movement about a vertical axis for transporting the booster from the storage assembly to the loading assembly.
The booster may be part of a booster assembly, with the booster assembly comprising in co-axial alignment:
An end of the spool may be formed to receive and locate an end of the booster such that the booster is seated on the spool when the booster assembly is in an upright orientation in the storage position before moving the booster to the operative depth in the hole.
The booster and the spool may have complementary formations that allow the spool to receive and locate the booster and thereby seat the booster on the spool.
The booster may be seated on the spool by being releasably coupled to the spool so that, in use, the booster is coupled to the spool in the storage position and can be moved clear of the spool as part of a process for moving the booster to the operative depth in the hole.
The booster and the spool may have complementary formations that allow the booster and the spool to be releasably coupled together by positively docking the booster on the spool and allow the booster to be released from the positive docking and moved clear of the spool as part of the process for moving the booster to the operative depth in the hole. With this arrangement, in use, the booster, spool and stake of the booster assembly may be moved together as a unit from the storage position to a position proximate the hole.
The storage assembly may be adapted to store a plurality of the booster assemblies.
The booster may comprise a booster casing that contains the explosives charge.
The booster casing may have an engagement feature, such as a collar, that facilitates engagement of the booster with the arm of the delivery assembly.
The spool may have a brake to control the release of the detonation cord.
The spool may comprise a spool casing having an engagement feature, such as a collar, that facilitates engagement of the booster assembly with the arm of the delivery assembly. With this arrangement, in use, the delivery assembly can move the booster assembly from the booster storage assembly to the loading assembly.
The stake may be connected to the spool so that the spool and the stake are movable as a unit.
The spool and the stake may be separately formed as two components that are connected together.
The spool and the stake may be connected together so that the spool can rotate about a central axis of the stake.
The spool may include a central cavity extending axially upwardly from a lower end of the spool that receives the stake.
The stake may include an elongate shank that is received in the cavity of the spool and supported for rotation about a central axis of the shank.
The storage assembly may comprise a plurality of upwardly-extending storage tubes for receiving and retaining the booster or booster assembly, with one booster or booster assembly per tube.
The storage assembly may comprise a lifting assembly for lifting each booster or booster assembly upwardly to an extended position such that the booster extends at least partially from the tube,
Each storage tube may include an internal guide that can slide in the tube and is adapted to receive and support a lower end of the booster assembly in the tube.
The internal guide may be adapted to receive and support a lower end of the stake of the booster assembly in the tube.
The internal guide may include an outer surface that has a diameter that is marginally less than a diameter of an internal wall of the tube and, in use, contacts the inner wall and facilitates sliding movement of the guide in the tube.
The internal guide may include a pair of spaced apart collars that have the above-described outer surfaces that, in use, contact the inner wall and facilitate sliding movement of the guide in the tube.
The spacing between the collars may be selected so that the guide can move in a stable way within the tube.
The internal guide may include a cavity extending from an upper wall of the guide for releasably receiving and supporting the stake. With this arrangement, the stake can be lifted clear of the internal guide when the booster assembly has been lifted to a raised position in the tube.
The storage assembly may comprise a platform that is arranged to rotate about a central upright axis, with the platform supporting the tubes. Rotation of the platform moves the tubes (and the boosters in the tubes) into a loading position. The tubes are open-ended, with the lower ends aligned with openings in the platform.
The invention also provides a booster assembly for use in a drill and blast operation, with the booster assembly comprising in co-axial alignment:
An end of the spool may be formed to receive and locate an end of the booster such that the booster is seated on the spool when the booster assembly is in an upright orientation in the storage position before moving the booster to the operative depth in the hole.
The invention also provides a method of delivering a booster for initiating an explosion of an explosive material in a hole in a floor of a pit into the hole, the method comprising the following steps controlled by an operator in a cabin of the vehicle or at a remote location to the vehicle or controlled as part of autonomous operation:
The booster may be part of a booster assembly, with the booster assembly comprising in co-axial alignment: the booster, a spool and a detonation cord wrapped around the spool at a storage position outside the hole and connected to the spool and to the booster, with the spool being provided for allowing the detonation cord to be unwound from the spool as the booster is moved from the storage position to the operative depth in the hole and the spool remains in the storage position, and a stake for locating the spool in the pit floor proximate the hole after the booster is at the operative depth in the hole.
With this arrangement, step (b) may comprise moving the booster assembly from the storage unit to an intermediate delivery position and then moving the booster of the booster assembly to the delivery position above the hole.
The method may comprise retaining the spool and the stake of the booster assembly at the intermediate position when the booster is moved to the delivery position.
Alternatively, with this arrangement, step (b) may comprise moving the booster from the storage unit to the delivery position above the hole, with the spool and the stake remaining in the storage unit.
Step (c) may comprise moving the booster downwardly by applying a downward force that moves the booster into the hole to the operative depth.
The method may comprise moving the booster downwardly solely via gravity pulling the booster into the hole to the operative depth.
Step (c) may comprise (i) coupling together the booster and a pusher element that is adapted to apply a downwardly-acting force to the booster, (ii) while coupled together, allowing the pusher element to move the booster and the pusher element downwardly from the delivery position to the operative depth of the booster in the hole, and (iii) releasing the booster from the pusher element when the booster is at the operative depth and withdrawing the pusher element from the hole.
The method may include supplying an explosive emulsion to a required height in the hole prior to positioning the booster into the hole.
The method may include supplying an explosive emulsion to a required height in the hole after positioning the booster into the hole.
Step (b) of the method may comprise removing the booster assembly from the bomb-proof storage unit and moving the booster assembly in an intermediate delivery position and then moving the booster of the booster assembly to the delivery position above the hole.
The method may include retaining the other components of the booster assembly at the intermediate position when the booster is moved to the delivery position.
The vehicle provides the following functions/advantages:
Various features, aspects, and advantages of the invention will become more apparent from the following description of embodiments of the invention, along with the accompanying drawings in which like numerals represent like components.
Embodiments of the invention are illustrated by way of example, and not by way of limitation, with reference to the accompanying drawings, of which:
Embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which various embodiments, although not the only possible embodiments, of the invention are shown. The invention may be embodied in many different forms and should not be construed as being limited to the embodiments described below.
While the embodiments of the initiation system vehicle (“ISV”) of the invention described and illustrated herein with reference to the Figures are described in relation to a drill and blast gold mining operation, this is merely illustrative, and it is contemplated that the ISV is applicable to other forms of mining operations and other suitable applications.
The embodiments of the ISVs are described by the reference numerals 1 and 101 in the Figures.
In general terms, the booster assembly 60 for use with the vehicles ISV 1 and ISV 101 shown in the Figures comprises (a) the booster 65, (b) a spool 63 with an upright axis (when in a storage position in the ISVs) and a length of detonation cord 66 wrapped around the spool and connected at one end to the spool 63 and at the other end to the booster, and (c) an elongate stake 61 connected at one end to the spool 63, with an upper end of the spool 63 being formed to receive a lower end of the booster 65 such that the booster 65 rests on and is not connected to the spool 63.
Two embodiments of the booster assembly 60 are described in more detail below in relation to
It is noted that the invention is not confined to use with the booster assembly 60 described above and shown in the Figures, and the key assemblies 10, 20, 30 of the initiation system vehicle described below and shown in the Figures may be adapted as required to store and insert different types of booster assembly into drilled holes in pit floors.
As shown in
With further reference to
Although the hole 90 is filled with explosive emulsion 93 and contains a booster 65, the hole 90 is referred to as a “safe hole” 90a as the aggregate 92 has been packed into the opening 94 of the hole 90 and mine personnel can approach the spool 63 with relative safety to tie the detonation cord 66 into other cords 66, in preparation for blasting.
Each of the embodiments ISV 1 and ISV 101 of the ISV comprises:
The storage assembly 10, the loading assembly 30 and the delivery assembly 30 are the key assemblies of ISV 1 and ISV 101. These assemblies store boosters 65 safely and transfer the boosters 65 in turn from storage positions to drilled holes in a pit floor.
The embodiment ISV 1 of the ISV shown in
The storage assembly 10 includes bomb-proof box 11 carrying a plurality of booster assemblies 60 in storage positions grouped in booster crates 83 on a rotating carousel 35.
The delivery assembly 20 comprises an adjustable transfer arm 21 having a gripping means in the form of a pair of jaws 23 for gripping a booster 65 or a booster assembly 60 while it is partially within the bomb box 11 and transferring the booster 65 or the booster assembly 60 to the loading assembly 30 positioned above a drill hole 90 on a pit floor 91, as illustrated in
The multiple assemblies 10, 20, 30 of the ISV 1, described in more detail below, allow an operator to remove each booster assembly 60 in turn from the bomb-proof box 11 and insert a booster 65 of the booster assembly 60 into an emulsion explosive-filled hole 90, such as illustrated in
The upper left-hand panel of
The remainder of
In general terms, the mine and the mining method shown in
The ISV 1 is suitable for use in step 8 of the mining method.
Steps 1-7 define the following steps: drilling a hole 90 such as shown in
More particularly, the mining method described in the specification of the International application comprises the following steps:
The ISV 1 illustrated in
In contrast, the ISV 101 of
Where components of the booster assembly 60 are retained in the bomb-proof box 11, as is the case in of ISV 1 shown in
The prime mover 70 is a vehicle having a cab 3 supported on a wheeled chassis 2. It is noted that the prime mover may be any other suitable vehicle. The chassis 2 also supports a mounting arm 4 operatively engaged to the frame 5 via a coupling 86. The coupling 86 allows the frame 5 to be pivoted about the arm 4. The coupling 86 allows the frame 5 to be disengaged and re-engaged from the arm 4 and thus removably attached to an alternative prime mover 70.
Illustrated in
On a first side of the frame 5, there is a winch arm 31 supporting a winch 8. These components form part of the loading assembly 30. The winch arm 31 is pivotable about the frame 5 to provide access to a plurality of holes 90 without the need to move the ISV 1. Nevertheless, typically (although not necessarily), the ISV1 will be moved from one hole 90 to the next hole 90 rather than be used to insert boosters 65 into multiple locations while the ISV1 is at one location.
At a distal end of the winch arm 31 is a fairlead 31a which guides a winch cable 32. The winch cable 32 is shown in
The loading assembly 30 also comprises at least one camera 19 and at least one light 77 mounted to the distal end of the winch arm 31 to assist in positioning and launching the booster 65 into the hole 90. The light or lights 77 and the camera or cameras 19 are preferably mounted in proximity to the pusher 41 to make it possible for the operator to visualise and analyse the hole 90 and the hole surroundings before, during and after loading of the booster 65. The camera(s) 19 can be an IR camera to take thermal readings before, during or after loading of the booster 65. The camera(s) 19 and the light (s) 77 may be any suitable products.
The bomb-proof box 11 has an access hatch 12 which allows for loading of the booster crates 83 therein. On a top surface of the bomb-proof box 11 there is also provided a booster access port 84, through which a booster 65 or booster assembly 60 can be controllably ejected from within the bomb-proof box 11. When, in use, the booster 65 is projected though the access port 84 and above the top of the bomb-proof box 11, the delivery assembly 20 can access the booster 65 and transfer the booster 65 to the loading assembly 30.
Once the booster 65 or booster assembly 60 is securely held in the jaws 23a, 23b, the transfer arm 21 is raised on a transfer arm booster 18, which allows the booster 65 or booster assembly 60 to be lifted clear of the access port 84. Once clear of the access port 84, the booster 65 or booster assembly 60 is rotated over the bomb-proof box 11 to a delivery tube 78 of the loading assembly 30. The purpose of the delivery tube 78 is to help guide boosters 65 into drilled holes 90.
Turning to
Each of the booster crates 83 contains between 1 and 6 booster assemblies 65 that are preloaded into the box 11 prior to the ISV 1 travelling onto the pit floor 91. Each of the booster crates 83 is locked into position on a rotating plate or carousel 35 which internally rotates about a central upright axis with the box 11 to align a predetermined booster assembly 65 with the access port 84.
Activation of a lifting assembly 50 below the carousel 35 raises a selected booster assembly 65 though the access port 84 so that the booster 60 of the booster assembly 65 can be received and gripped by the jaws 23a, 23b of the transfer arm 21. In this position, the transfer arm 21 can move the booster 60 clear of the other components of the booster assembly 65, which are retained in the box 11. The lifting assembly 50 is described in more detail in conjunction with
The access hatch 12 has handles 51 (see
To one side of the hatch 12 there is provided an emergency stop (e-stop) 6 (see
When the storage assembly 10 is being transported to a drilled hole 90, the access port 84 of the storage assembly 10 is sealed by an actuated lid 36, which ensures full containment of the contents of the bomb-proof box 11. The actuated lid 36 is only opened to unseal the access port 84 once a booster 65 of a selected booster assembly 60 is ready to be ejected from the box 11.
Turning now to
The loading assembly 130 comprises a loading cage 133 which houses the pusher 41.
Also illustrated in
The holder 188 is a frame made from a plurality of hoops which, in use, receive the stake 61 of the booster assembly 60. The hoops are engaged with the winch arm 131 to keep the cage 133 clear of external attachments. While the stake 61 is held in the holder 188, the spool 63 of the booster assembly 60 is free to rotate and pay-out detonation cord 66 as the booster 65 descends into the hole 90. A tie-off slot 68 (see
A detonation cord guide 134 is positioned around a portion of a periphery of the top of the box 111 in which the detonation cord 66 (not shown in
With further reference to
Below the top of the box 111 is a circular arrangement of 6-8 booster crates 83 each containing 6 booster assemblies 60. Each of the crates 83 is mounted in a predetermined location onto the carousel 135 to be rotated in turn to align with the access port 184.
Mounted to a side wall of the bomb-proof box 111 is a water tank 137 and water pump 138.
Mounted under the carousel 135 is a slew drive 139 for rotating the carousel 135, the lifting assembly 50 for raising the booster assemblies 60, and a radio frequency identification (RFID) reader 199 for monitoring and recording the status of each crate 83.
The RFID reader 199 makes it possible to locate each booster assembly 60 in a particular crate 83. This is important in order to match a booster 65 having particular detonation characteristics with the requirements for a drilled hole 90. The RFID reader 199 also facilitates monitoring of the status of the booster crates 83 and the number and location of the remaining booster assemblies 60 within the crates 83.
The carousel 135 is provided with a manual-rotation hand pump 114, illustrated in
Additional arrays of lights 177 and cameras 119 are disposed about the storage assembly 110 and its subassemblies to illuminate and analyse conditions about the ISV 101 when in use.
In the exploded view of
The transfer arm booster 118 is illustrated in cross-section in
A proximity sensor 129 is located centrally at the base of the support post 126 to monitor the location of the transfer arm 121.
Within the support post 126, a telescoping post 127 is engaged with the hydraulic cylinder 125, to raise and lower the telescoping post 127, and thus raise and lower the attached transfer arm 121, relative to the frame 5.
The transfer arm 121 is illustrated in detail in
Extending from the transfer arm booster 118 is a rigid winch arm 131 which supports the winch 108 of the loading assembly 130. The loading assembly 130 comprises the loading cage 133, a loading chute 189, the pusher 41 and attached winch cable 132. The winch 108 is activated to pay-out or haul-in the winch cable 132 to lower or raise the pusher 41, respectively.
The pusher 41 is stored in a retracted configuration whereby the pusher 41 is retracted in a chute 198 (not shown in 10A and 10B). The chute 198 surrounds the pusher 41 and protects a booster engagement mechanism 149 thereon. The booster 65 is brought towards the cage 133, wherein the booster 65 fits between bars of the cage 133 to be centrally located therein. This brings the booster 65 and a booster dock 69 into alignment with the pusher 41 and the booster engagement mechanism 49. The winch 108 is activated and the cable 132 is paid-out to lower the pusher 41 within the chute 198 and engage the booster engagement mechanism 49 into the booster dock 69 to thereby couple the pusher 41 and the booster 65 together. The booster engagement mechanism 49 is activated to lock the pusher 41 to the booster 65. This mechanism 49 is described in further detail in relation to
The combined weight of the pusher 41 and the booster 65 is sufficient to push the pusher 41 and the booster 65 downwards through the explosive emulsion 93 and insert the booster 65 at a selected operative depth within a hole 90. It is noted that the weight of the pusher 41 and/or the booster 65 may be adjusted as required to insert the booster 65 at the required depth having regard to factors, such as the viscosity of the emulsion explosive 93 in the hole 90.
Various sensors can be attached to the winch 108 and the cable 132 to monitor the progress of the booster 65 as it descends into the hole 90. For example, if the rate of descent changes, a signal can be feedback to the operator in the cabin 3 that the booster 65 may have become caught or impeded in some manner. Similarly, if the winch cable 132 becomes slack a signal can be sent to alert the operator in the cabin 3 that the booster 65 has reached a base of the hole 90.
Once the booster 65 has reached the selected operative depth within the hole 90, the booster engagement mechanism 49 is deactivated severing the engagement between the booster 65 and the pusher 41, such that the winch 108 is placed into reverse, the winch cable 132 hauled-in and the pusher 41 ascends the hole to be returned to the retracted configuration with the chute 198.
The chute 198 and the cage 133 are formed from a series of constant diameter, elongate rods 133a. A plurality of rods 133a (between 6 and 10) are arranged equidistantly in a circular formation. The diameter of the arrangement of rods 133a sufficient to house the pushed 41 in the chute 198. A portion of the chute 198 greatly increases in diameter to form the cage 133 and is sufficiently wide to house the pusher 141 and the booster 65 therein, as illustrated in
In
Although
Within the booster crates 83, six individual booster assemblies 60 are housed. It is noted that the crates 83 may be formed to receive any other suitable number of boosters 60. The booster crates 83 are essentially comprised of six hollow storage tubes 17 held in configuration by an end plate 89a, a top plate 89b, and a mid-plate 89c. Each crate 83 further comprises a handle 87 for manually loading the crates 83 onto the carousel 135, see
The bomb-proof box 111 comprises an inner casing 111a within which the carousel 135, lifting assembly 50, and rotation mechanism 139 is housed. This is typically formed from steel and is sufficiently strong to contain an explosion with the box 111, illustrated in
Within each of the storage tubes 17 of the crate 83 there is a guide 62 that holds the booster assembly 60 within the storage tube 17. The guide 62 in cross-section has an I-beam shape, having a central recess for receiving and supporting the stake 61 of the booster assembly 60 and an upper and lower flange that holds the guide 62 at a fixed location within the tube 17. The guide 62 is held in place by friction between the flanges of the guide and the inner walls of the tube 17.
As the carousel 135 rotates, three storage tubes 17 are brought into alignment with three lifters 59 of the lifting assembly 50. The carousel 135 comprises a plurality of through-holes 147 which are aligned with the storage tubes 17 of each crate 83. The alignment is facilitated by the mounting slots 53 and guides 55 of the booster crates 83 as loaded onto the carousel 135.
As the first of the three lifters 59 is activated, the lifter 59 extends through the cooperating through-hole 147 in the carousel 135 and extends further into the storage tube 17 above. The lifter 59 makes contact with the guide 62 and pushes the guide 62 (and booster assembly 60 therein) upwards along the tube 17, until the booster 65 is ejected from the box 111 through the access port 184. Once the lifter 59 reaches the extent of allowable travel, the lifter 59 is retracted back through the tube 17 and withdrawn from the cooperating hole 147 to allow the carousel 135 to rotate freely over the lifting assembly 50.
When the booster assembly 60 is withdrawn entirely from the storage tube 17, the guide 62 is retained by friction within the tube 17 and can be reused when the storage tubes 17 of each crate 83 are reloaded.
The cross-sectional view of
The lifting assembly 50 is illustrated in
With further reference to
With reference to
The booster assembly 60 includes two axially-spaced apart collars 103 with outermost surfaces 101 having diameters that are selected to be marginally less than an inner diameter of the hollow storage tubes 17 so that the booster assembly 60 can be snugly stored in the tube and can slide in the tube.
As can best be seen in
A base 74 of the booster 65 is a bullnose shape that in use cooperates with an engagement recess 67 extending into the spool 63 from an upper end (as viewed in the Figures) and forms a booster dock 69 in the spool 63. The connection between the recess 67 of the spool 63 and the bullnose end 74 of the booster 65 is a push fit: tight enough to support and connect the spool 63 and the booster 65 but easily separated.
The spool 63 has a central neck 63 around which the detonation cord 66 (not shown in
As can best be seen in
The stake 61 has an elongate shank 75 and a pointed end 77 and is a robust structure for anchoring the spool 63 and attached detonation cord 66 to the pit floor 91 proximate a safe hole 90a in preparation for tie-in, as described above in relation to
The stake 61 is connected to the spool 63 so that the spool 63 and the stake 61 are movable as a unit. The spool 63 and the stake 61 may be separately formed as two components that are connected together. The shank 75 of the stake 61 is received in the cavity 91 of the spool 63 and supported via bearings 87 so that the spool 63 can rotate about a central axis of the shank 75 and thereby, in use facilitate the detonation cord 66 unwinding from the spool 63 as the booster 65 is positioned in the hole 90 in the pit floor 91—see
The head of the spool 63 and the head of the booster 65 have the same neck profile 71 so that the spool 63 and the boosters 65 can cooperate with the same gripping mechanism (not shown) of a delivery assembly of the above-mentioned ISV.
The spool 63 and the booster 65 have the same-shaped recess 67 to allow a pusher 41 of a delivery assembly of the above-mentioned ISV to separately engage with the spool 63 and the booster 65. The engagement of the pusher 41 and the booster 65 is illustrated in the embodiment of the booster assembly shown in
The embodiment of the booster assembly shown in
The spool 63 and the stake 61 are identical to the same components in the embodiment shown in
However, the booster 65 is different. Specifically, the booster 65 is the same booster 65 as the booster 65 of the embodiment shown in
The booster 65 of this booster assembly 60, as shown in
The booster 65′ shown in
A base 74, 74′ of both boosters 65, 65′ provides a rounded protrusion that in use cooperates with the engagement recess 67 that forms a booster dock 69 in the spool 63. The connection between the recess 67 of the spool 63 and the base 74 of each booster 65, 65′ is a push fit: tight enough to support and connect the spool 63 and each booster 65, 65′ but easily separated.
The upper and lower portions of each booster 65, 65′ are identical to facilitate engagement with a common design of the spool 63 and the pusher 41.
The spool 63 has a central neck 63a around which the detonation cord 66 is wound for storage. The tie-off slot 68 can be located anywhere upon the spool 63 and is used to secure a free end (not illustrated) of the detonation cord 66.
A brake mechanism 64 is provided within the spool 63 to limit the rate at which the detonation cord 66 is paid-out. The brake 64 comprises a pin that extends through the spool 63 and into contact with the stake 61 therein. Pushing or pulling on the pin increases or decreases the friction between the spool 63 and the stake 61 thereby altering the rate at which the spool 63 rotates about the stake 61.
The stake 61 of the booster assembly 60 is pointed and robust for anchoring the spool 63 and attached detonation cord 66 to the pit floor 91 adjacent to a safe hole 90a in preparation for tie-in.
The head of the spool 63 and the heads of the booster 65, 65′ have the same neck profile 71 so that the spool 63 and each of the boosters 65, 65′ can cooperate with the same gripping mechanism 123 of the delivery assembly 120.
The spool 63 and the booster 65, 65′ have the same shaped recess 67′ to allow the pusher 41 of the delivery assembly 30 to engage with the spool 63 and each of the boosters 65, 65′. The engagement of the pusher 4 and the booster 65 is illustrated in
The booster engagement mechanism of 49 of the pusher 41 of the delivery assembly of ISV 1 is illustrated in
The pusher 41 is an elongate element with an upper end and a lower end as evident from
A large portion of the internal volume of the pusher 41 is filled with ballast 105 for example lead, to increase the weight of the pusher 41 and to assist the booster 65 move downwardly through the explosive emulsions 93 (
The booster engagement mechanism 49 is located in a lower section of the pusher 41.
The pusher 41 includes a chamber 117 in a lower section of the pusher 41. The chamber 117 is defined by a section of the side wall 121 of the pusher 41, An upper partition member 123 that separates the chamber 117 and the ballast 105, and lower end element 125.
The pusher 41 also includes a plate 75 that is arranged for sliding movement along the length of the chamber 119. The plate 75 divides the chamber 117 into an upper chamber 117a and a lower chamber 117b.
The pusher 41 also includes a spring 43 in the upper chamber 117a. The spring 43 is selected so that it can extend axially downwardly and compress axially upwardly in response to sliding movement of the plate 75 in the chamber 117.
As can best be seen in
The pusher 41 also includes a cylindrical actuator 45 that is connected at one end to the plate 75 and at the other end to the above-mentioned conical nose 46. The actuator 45 extends through an opening in the lower end element 125.
In addition, the pusher 41 includes a compressible member 48 that is mounted along a section of the length of the actuator 45 between the nose 46 and an end plate 75.
As can be appreciated from
Under normal operating conditions, it is necessary to supply air to the pusher 41 in order to couple together the booster 65 and the pusher 41. It is noted that when there is no air supply to the pusher 41, the pusher 41 will automatically decouple form the booster 65.
In use, in order to couple the pusher 41 to the booster 65, the pusher 41 and booster 65 are first axially aligned.
The conical nose 46 of the pusher 41 is then inserted into the recess 67 of the pusher dock 79 of the booster 65 until it cannot move forward from this engaged position—as shown in
Compressed air is then fed into the inlet 44 and downwardly through the central tube 115 and into the lower chamber 117b. The air increases the pressure in the lower chamber 117b and causes the plate 75 to move upwardly in chamber 117 against the action of the spring 43. This upward movement of the plate 75 cause the actuator 45 and the nose 46 to move upwardly, thereby causing the compressible member 48 to be compressed in an axial direction and expanded outwardly in a radial direction. As the compressible member expands in a radial direction the friction between the recess 67 and the compressible member 48 is increased locking the pusher 41 to the booster 65, illustrated in the coupled mode of
To decouple the pusher 41 from the booster 65, the compressed air source (not shown) is de-activated, and reduces the pressure in chamber 117b, at which time the return spring 43 expands, pushing plate 75 downwardly and the actuator 45 away from the pusher 41 and allowing the compressed member 48 to expand in an axial direction and contract in the radial direction, reducing the friction between the recess 67 and the compressible member 48 and releasing the booster 65 from the pusher 41, illustrated in the decoupled mode of
A booster delivery vehicle 80 is illustrated in
The booster crates 83 are entirely housed within a bomb-proof casing 82 which forms an enclosed cargo area of the vehicle 80. During transit the driver of the vehicle 80 and other road users are isolated from the loaded crates 82 within.
It will be appreciated by persons skilled in the art that numerous variations and modifications may be made to the above-described embodiments, without departing from the scope of the following claims. The present embodiments are, therefore, to be considered in all respects as illustrative of the scope of protection, and not restrictively.
By way of example, it is noted that the ISV 1,101 may include load sensing, for example, a load cell on the base of the winch 108 to detect the tension in the cable 132 and hence delivery force of the booster 65. This can be used to sense the medium the booster 65 is being deployed into such as emulsion 93, water, mud, air etc. A force versus velocity map can be derived and stored in the controller of the ISV 1, 101, when deploying the booster 65 at different speeds the medium can be identified by comparing the force to the map derived and stored in the controller or another accessible means of data storage. This feature may also be applied to limit the force applied to the pusher 41 and hence the booster to avoid unsafe situations.
In addition, the embodiments of the ISV 1, 101 may include a control system 95 that is able to accept data such as a shot plan or call on data from a drill, emulsion loading device or other relevant surveying devices such as a temperature monitoring unit. The control system can receive this data by local upload/download, cloud server or other data transfer means. This data could be used for suitable product selection based on the data referenced to that drilled hole, depth of product insertion, location and/or identification of the hole. Data collected from the ISV 1, 101 may also be retrieved and/or uploaded to other systems and machines such as shot planning software and/or downstream processes such as stemming loaders to enhance the accuracy of automated mining processes.
In addition, whilst the embodiments of the ISV 1 are described in the context of delivering boosters 65, 65′ containing an explosives charge to a blast hole, the invention is not so limited and extends to the use of other types of boosters that can initiate an explosion of an explosives material in a blast hole and do not rely on an explosives charge in the boosters.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, a limited number of the exemplary methods and materials are described herein.
It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.
In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2018902374 | Jun 2018 | AU | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/AU2019/050689 | 6/28/2019 | WO | 00 |
