LOW VOLTAGE HYDRAULIC SYSTEM WITH ELECTRONIC CONTROL FOR MOVING AUTOMATIC CLOSING APPARATUSES

Abstract

The invention concerns a hydraulic system for moving automatic closing apparatuses, comprising hydraulic actuating means capable to move at least one movable member coupled to at least one closing apparatus, wherein said hydraulic actuating means is operated by at least one low voltage dc motor. Preferably, the electronic unit controls, through an encoder and microswitches, the position of a piston or a rotating shaft that operates the automatic closing apparatus during closing and opening phase, favouring an automatic learning of operation times.

Description

The present invention will be now described, by way of illustration and not by way of limitation, according to its preferred embodiments, by particularly referring to the Figures of the enclosed drawings, in which:

FIG. 1 shows a schematic perspective view of a portion of a first embodiment of the system according to the invention;

FIG. 2 shows a top view of the system of FIG. 1;

FIG. 3 shows a perspective view of a particular of the system of FIG. 1;

FIG. 4 shows a schematic block diagram of the system of FIG. 1;

FIG. 5 shows a schematic perspective view of a portion of a second embodiment of the system according to the invention; and

FIG. 6 shows a schematic perspective view of a portion of a third embodiment of the system according to the invention.

In the following of the description same reference numbers will be used for indicating alike elements in the Figures.

With reference to FIGS. 1 and 2, it may be observed that a first embodiment of the system according to the invention comprises a linear hydraulic actuator applied to a swing-gate (not shown), to which it is conventionally coupled through two plates 1 and 2. In particular, the plate 1 is coupled to the fixed frame of the gate (or to the fixed structure, such as a wall, in which the gate is inserted), whereas the plate 2 is coupled to the wing.

The actuator comprises a low voltage (preferably 12 V or 24 V) dc motor 3 controlling a pump 4. The pump 4, through a distributor or directional valve 5 for switching the oil flow, linearly moves a piston 6, the distal end of which (that is external to a cylinder 9 wherein the other end of the piston 6 slides) is integrally coupled, through the plate 2, to the gate wing. A rod 7 is integrally coupled to the distal end of the piston 6, whereby it is linearly moved with respect to the pump 4 by the movement of the same piston 6.

The motor 3, the pump 4, the distributor 5 and the cylinder 9 for sliding the piston 6 are integrally coupled to each other and hinged on the first plate 1, whereby the linear movement of the piston 6, coupled to the second plate 2, causes the wing to which the latter is attached to open or close.

The proximal end (that is the one closest to the pump 4) of the rod 7, the position of which with respect to the pump 4 depends on the movement of the piston 6, is provided with a cursor 8 capable to interact with a first switch 10, when the position of the cursor 8 corresponds to the complete opening of the gate wing, and with a second switch 11, when the position of the cursor 8 corresponds to the complete closing of the gate wing. In particular, when the cursor 8 interacts with one out of the two switches 10 and 11, a corresponding signal is forwarded through cables 12 to a control electronic unit (not shown in FIGS. 1 and 2) that stops the motor 3 and, consequently, the pump 4.

With reference to FIG. 3, it may be observed that the system of FIGS. 1 and 2 is further provided with a detector for detecting the position of piston 6 (and, consequently, of rod 7 and cursor 8) which detector is made through a magnetic encoder comprising a rotating disc 13 of ferrous material, integral with the shaft of the motor 3, and a detection unit 14, measuring the variation of a flow generated by a permanent magnet and sending to the control electronic unit a corresponding signal depending on the detected variations of magnetic field, i.e. on the angular position of the motor and, consequently, the position of the piston 6.

With reference to FIG. 4, it may be observed that the electronic architecture of the system of FIGS. 1 and 2 comprises the control electronic unit 16, that controls the motor 3 of the system hydraulic actuator, and that receives the signals coming from a unit 15 for detecting the position of the piston 6 (depending on the rotation of the motor 3). Such detection unit 15 comprises the switches 10 and 11 and the magnetic encoder 13-14.

Unit 16 is further connected to an input/output interface unit 16, through which system operation data may be read, thus detecting for instance possible malfunctions, and through which system operation parameters may be updated.

In particular, through a button 18, operatable by an installer, that is connected to such interface unit 17, it is possible to carry out in an automatic manner stroke and time learning through the control unit 16, as it already usually occurs in low voltage electromechanical actuators. In fact, the magnetic encoder (or, alternatively, a plurality of limit switches, of the same type as switches 10 and 11, distributed along the path of the cursor 8) allows the control unit 16 to know the position of the gate wing during its movement, and in particular when the latter reaches a final beat (either when opening or closing), thus favouring a substantially automatic learning of operation times.

FIG. 5 shows a second embodiment of the system according to the invention, applied to an underground rotating actuator, wherein the low voltage (preferably 12 V or 24 V) dc motor 3 is still visible, which motor controls the pump 4 that, through the distributor 5, causes a rotating shaft 19 to rotate, which shaft is connected to the closing apparatus (not shown), e.g. a gate, of which the system controls the movement. The system of FIG. 5 is provided with a detector for detecting the angular position of the shaft 19 that is implemented through a magnetic encoder, comprising a rotating disc 13 and a detection unit 14, that measures the angular position of the motor 3.

FIG. 6 shows a third embodiment of the system according to the invention, applied to a traffic bollard or a barrier, wherein a low voltage (preferably 12 V or 24 V) dc motor 3 is still visible, which motor controls a pump 4 that linearly moves, through a distributor 5 connected through two ducts 20 and 21 to a cylinder 9 within which a piston 6 slides, the same piston 6, to which the traffic bollard (not shown), of which the system controls the movement, is integrally applied. The system of FIG. 6 is provided with both the switches 10 and 11, capable to interact, similarly to the system of FIGS. 1 and 2, with the cursor 8 of a rod 7 integral to the piston 6 for detecting its two limit positions, and a detector for detecting the angular position of the piston 6 implemented through a magnetic encoder, comprising a rotating disc 13 and a detection unit 14, which measures the angular position of the motor 3.

Other embodiments of the system according to the invention may further comprise a conventional device for amperometrically recognizing an obstacle, that possibly causes an impact during closing, which device is controlled by the electronic unit 16.

Still, thanks to the low voltage power supply, further embodiments of the system according to the invention may comprise emergency batteries and/or solar panels for ensuring system operation even in case of lack of energy.

The advantages offered by the system according to the invention are evident.

First of all, besides the fact that it operates at low voltage, the system has no calibration valves on the distributor, and all the parameters of speed, force, decelerations and sensitivity are adjustable at electronic level. In particular, adjustments of speed and sensitivity, nowadays impossible on presently commercialized traditional hydraulic automations, are instead possible in the system according to the invention. This entails a great simplification of the system installation, that does not necessarily require intervention of specialized installers, consequently reducing the related costs.

Also, the system according to the invention more easily allows to meet safety regulations in force without using expensive and complex external devices.

Still, use of electronic and/or magnetic detectors for detecting the position of the automatic closing apparatus, or even only the complete opening and the complete closing thereof, allows, on the one hand, to avoid the use of mechanical beats on the ground, forbidden in some countries such as the US for safety reasons, thus also simplifying system installation, and, on the other hand, to eliminate the classical problem of the hydraulic actuator that prosecutes for some seconds its pushing movement even after having arrived at stop, causing a greater wear and a more frequent maintenance thereof.

The present invention has been described, by way of illustration and not by way of limitation, according to preferred embodiments thereof, but it should be understood that those skilled in the art can make variations and/or changes, without so departing from the related scope of protection, as defined by the enclosed claims.

Claims

1. A hydraulic system for moving automatic closing apparatuses, comprising hydraulic actuating means capable to move at least one movable member coupled to at least one closing apparatus, wherein said hydraulic actuating means is operated by at least one low voltage dc motor.

2. A hydraulic system according to claim 1, wherein said at least one low voltage dc motor operates at 12 V or 24 V.

3. A hydraulic system according to claim 1, the system further comprising detecting, preferably electronic and/or magnetic, means for detecting the position of said at least one movable member.

4. A hydraulic system according to claim 1, wherein said hydraulic actuating means is capable to linearly move said at least one movable member, making it translate.

5. A hydraulic system according to claim 4, the system further comprising detecting, preferably electronic and/or magnetic, means for detecting the position of said at least one movable member, which detecting means comprises one or more electronic switches each one of which is capable to detect a corresponding linear position of said at least one movable member.

6. A hydraulic system according to claim 5, wherein said at least one movable member is a piston.

7. A hydraulic system according to claim 6, wherein said one or more electronic switches are capable to interact with a cursor member of a rod integrally coupled to the piston.

8. A hydraulic system according to claim 1, wherein said hydraulic actuating means is capable to angularly move said at least one movable member, making it rotate.

9. A hydraulic system according to claim 8, the system further comprising detecting, preferably electronic and/or magnetic, means for detecting the position of said at least one movable member, which detecting means is capable to detect the angular position of said at least one movable member.

10. A hydraulic system according to claim 8, wherein said at least one movable member is a rotating shaft.

11. A hydraulic system according claim 4, the system further comprising detecting, preferably electronic and/or magnetic, means for detecting the position of said at least one movable member, which detecting means comprises a magnetic encoder, provided with a rotating disc, coupled to the shaft of said at least one motor, and with a detection unit.

12. A hydraulic system according to claim 1, the system further comprising an electronic unit controlling said at least one motor.

13. A hydraulic system according to claim 12, the system further comprising detecting, preferably electronic and/or magnetic, means for detecting the position of said at least one movable member, wherein the electronic unit controls said at least one motor on the basis of one or more signals which it receives from said detecting means.

14. A hydraulic system according to claim 12, wherein the electronic unit is connected to an input/output interface unit.

15. A hydraulic system according to claim 14, wherein the interface unit is connected to at least one button, the electronic unit learning one or more movement parameters of said at least one closing apparatus on the basis of at least one signal received from said at least one button.

16. A hydraulic system according to claim 1, wherein said hydraulic actuating means comprises a pump capable to move, through a distributor or directional valve for switching an oil flow, said at least one movable member.

17. A hydraulic system according to claim 1, the system further comprising means for recognizing, preferably amperometrically, an obstacle.

18. A hydraulic system according to claim 1, the system further comprising battery and/or solar panel power supply means.