FR2459895A1 - REMOTE POWER SUPPLY AND CONTROL DEVICE FOR A PLURALITY OF HYDRAULIC RECEIVERS ARRANGED ON THE SAME GEAR - Google Patents

Abstract

THIS DEVICE CONCERNS THE POWER SUPPLY AND REMOTE CONTROL OF HYDRAULIC CYLINDERS, MOTORS OR PERCUSSION MECHANISMS, PROVIDED ON THE SAME DEVICE. A HYDRAULIC ELECTRO-VALVE IS MOUNTED ON THE UNIT NEAR EACH RECEIVER, OR INTEGRATED IN THIS RECEIVER. ALL THE RECEIVERS ARE POWERED BY TWO COMMON HYDRAULIC DUCTS, ONE OUTWARD AND THE OTHER RETURN, WHICH GO THROUGH THE DIFFERENT ELECTRO-VALVES. ALL THESE SOLENOID VALVES ARE REMOTELY CONTROLLED BY MEANS OF A COMMON ELECTRICAL CABLE, FOR EXAMPLE TRANSMITTING COMMAND ORDERS IN THE FORM OF CODED SIGNALS THAT CAN DESIGNATE THE DIFFERENT RECEIVERS. APPLICATIONS: MACHINERY USED IN THE OPERATION OF MINES, PUBLIC WORKS EQUIPMENT.

Description

I

  The present invention relates to a feeding device

  and remote control for a plurality of receivers

  such as cylinders, motors or percussion mechanisms.

  hydraulics, arranged on one and the same machine,

  gin used in mining or public works machinery.

  In vehicles of this kind, such as, for example,

  boreholes and hydraulic excavators, feeding the various hydraulic receivers, usually carried by a

  same articulated arm, is performed by a set of hoses.

  Each receiver is powered by two hydraulic hoses, one for the one and the other for the return of the fluid, so that on multi-receiver machines, it is necessary to

  provide a beam comprising a large number of hoses.

  By way of example, FIG. 1 represents, schematically,

  a system of this type applied to a drill rail 1 carrying various receivers such as hydraulic cylinders 2, 1, 4 and a hydraulic motor 5. Each receiver is connected by two hoses 6, 7 to a corresponding hydraulic distributor 8, placed on the rolling frame of the drilling apparatus. The

  Receptors are usually divided into several groups.

  group of distributors 8 whose food

  tion is carried out from separate pumps, the drawing

  corresponding to the case, taken as an example, of two groups of dis-

  tributors fed respectively by two pumps 9 and 10. A

  common return conduit 11 connects all distributors to the

  tank. It is understood that the hydraulic connection between the frame of the apparatus and the slide Rre 1, schematically connected by a

  single feature at 12, actually includes 2 n hydraulic hoses

  if n represents the total number of receivers (without

  any hoses for the direct return of the leaks to the tank). It is also understood that this bundle of multiple hoses is a disadvantage in the use of the machine, since the hoses are subject to twisting, clashing, wear, breakage ...., and that these operating incidents are obviously all the more frequent as the hoses are numerous.

  These numerous hoses have the additional disadvantages

  res, significant weight and bulk, and high cost; the considerable volume occupied by the hoses makes

  difficult to access some organs of the craft.

  Referring again to Figure 1, here again we recall

  whereas, in the case where distributors 8 are not

  Directly, manually, it is already known to achieve, for the kind of gear considered, an electric remote control cable circuit, comprising a remote control box 13 connected, via a multi-wire cable. conductors 14, to a connecting box 15, itself connected by wires 16 to

  electromagnets of the different distributors 8.

  In view of the foregoing, the invention is aimed primarily at

  supply of a plurality of hydraulic receivers which no longer requires a large number of

  hydraulic connection hoses, so that the disadvantages

  previously reported issues will be eliminated, while being

  patible with a centralized remote control, by electric means.

  For this purpose, the subject of the invention is a feeding device

  and remote control for a plurality of receivers.

  hydraulic actuators, such as cylinders, motors or hydraulic percussion mechanisms, arranged on the same machine, in which: a hydraulic electro-valve is mounted on the machine nearby

  each receiver, or integrated this receiver, all receivers

  They are powered by only two common hydraulic lines, one to go and one to return, through the different solenoid valves; and all electro-valves are remotely controlled by means of a common electrical cable, with a single or multiple conductor terminating in the different electro-valves. The principle of the invention thus consists in connecting

  electro-valves on two common hydraulic lines, these electro-

  valves supplying respective receivers placed in close proximity, which allows to significantly reduce the number of hydraulic hoses, and more generally hydraulic connections, since this number is reduced to two regardless of the total number of receivers. Simplification as well

  obtained greatly reduces the frequency of operational incidents.

  (clashes, breaks ...), and reduces the weight and the volume of the hydraulic connections, so allows a decrease

  their cost and better accessibility to the organs of

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  gin; it should be noted that the cockpit of the machine is thus made more "ventilated", and that the maintenance of the machine is facilitated. Another advantage of this device, interesting in some applications, is the reduction of the response time of the receivers to a control command. Indeed the electro-valves, being arranged near the receivers and being connected to hydraulic ducts whose go duct can be pressurized permanently, cause an immediate start of the receivers, while in the current systems there is a certain response time due to the prior pressurization of the hoses. Furthermore, the feed device according to the invention makes it possible to have only one feed pump, while offering the same possibilities of hydraulic use, in particular the possibility of simultaneously controlling several receivers, by choosing a

suitable type of electro-valves.

  The previously defined feed device can be combined with a remote control according to the principle of FIG. 1, that is to say with a set of electric wires such as the wires 16, resulting in the different electro-valves which are then controlled. independently. In the case where the machine

  considered is used in a normal atmosphere, this electrical connection

  that with the different electro-valves is quite easily achievable by means of a multi-conductor cable, gathering all the wires, although the dimensions of this cable become

  important if the number of receivers to be fed is high.

  On the other hand, in the case of a machine working in an atmosphere

  explosive, which is sometimes the case with

  the solution which has just been

  sagé is not always acceptable. This multicore cable solution, with independent control of the different electro-valves, remains applicable if a level of

  low electrical power compatible with the relative standards

  are intrinsically safe; in this case, an amplifier stage

  hydraulic system is simply to be expected on each electro-

  valve. On the contrary, if intrinsic safety is not

  the connecting wires should be controlled individually

  This would lead to the replacement of multi-core cable

  by a set of cables. Thus the hydraulic hose bundle

  could actually be removed, but there would be

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  its place, a bundle of electrical cables, bulky and obviously exposed to the same risks of twisting, snagging, etc ..., and there would be virtually no benefit of this substitution. Moreover, in the current remote control circuit illustrated in FIG. 1, the multi-conductor cable 14, which connects the remote control box 13 to the terminal box 15, is of large dimensions, and therefore of high weight, if the number of receivers to order is large. In this case, the operator who

  wears the shoemaker has trouble moving.

  In order to eliminate these disadvantages, it is provided, according to one embodiment of the invention, means located at a distance from the receivers and able to convert the control commands of the

  different receivers in coded signals transmitted on a

  simple or multi-electric common electric actuator to all solenoid valves, each solenoid valve being associated with a

  signal decoder circuit, able to excite the coil of the electio-

  valve only when transmitting a signal designating the

  hydraulic receiver corresponding to this electro-valve.

  Thanks to this coding system for the control commands of the receivers, the device according to the invention can be used in all cases in an explosive atmosphere, this in good security conditions, without this leading to a complication of the electrical wiring. The choice of a coding system may also eliminate the need for a multiconductor cable terminating

to the remote control cabinet.

  The device according to the invention is compatible not only with

  with a remote control cable, but also with a remote control by radio: -in the first case, there is provided a remote control box

  with encoder connected by a cable to a receiver-analyzer of

  the electrical conductor passing through all the electro-valves mounted near the corresponding hydraulic receivers; in the second case, there is provided a remote control unit by

  radio, with transmitter and encoder, associated with a receiver-amplifier

  signal generator connected by a cable to a signal receiver-analyzer, from which the common electrical conductor passes through all the solenoid valves mounted near the receivers

corresponding hydraulic systems.

  In both cases, the remote control cabinet includes a

  code operator transposing the order

  coded signal receivers which, after formatting and

  amplification by the receiver-analyzer of signax, .. are transmitted by a single or multiple conductor, but always common, to each hydraulic solenoid valve. Of course, he

  It is also necessary to power the coils of the different

  your electro-valves; this can be achieved by one or more separate cables but the device according to the invention comprises

  advantageously a single connecting cable with all the electri-

  three-way valves mounted near the hydraulic receivers cor-

  said cable containing, on the one hand, the electrical conductors for the power supply of the coils of

  electro-valves, and on the other hand, the aforementioned driver transmits

  coded signals, this conductor being surrounded by a

  ge. When the device is intended for a machine operating in an explosive atmosphere, all the conductors of the cable of

  aforementioned connection is surrounded, in addition, an armor.

  Anyway, the invention will be better understood using

  of the description which follows, with reference to the schematic drawing

  annexed representative, as non-limiting examples, a few embodiments of this device for supply and remote control for a plurality of hydraulic receivers arranged on the same machine: Figure 2 is a block diagram of the device according to the invention, with indication of a possible variant Figure 3 shows an embodiment of the device according to the invention, applied to a drill slide; Figures 4L and 5 are sectional views of the binding target with the receiver-mounted solenoid valves in two embodiments;

  Figure 6 is a detailed view of one of these electro-valves.

associated with a receiver.

  As shown in FIG. 2, the device according to the invention comprises, for its "remote control" part, a remote control box 17 connected by a cable 18 to a signal receiver-analyzer 19, itself connected by another 20 to a plurality of electro-valves 21. Each electro-valve 21 is

  mounted on the corresponding receiver, not shown.

  On the remote control unit 17 is provided an encoder which converts the control commands of the different receivers into coded signals, which are transmitted on the cable 18 to the receiver-analyzer 19. The functions of this signal receiver-analyzer 19 are: the shaping and amplification of the signals, before sending them to the electro-valves 21;

  - an operating logic block role, containing all the se-

  necessary curities and prohibitions;

  - the possible programming of automatic sequences.

  Each solenoid valve 21 comprises a decoder circuit of the signals transmitted on the cable 20, this circuit functioning to excite the coil of the solenoid valve only when transmitting a signal designating the hydraulic receiver.

associated with this electro-valve.

  Two hydraulic ducts 22 and 23, one to go and the other

  back, feed all the receivers, the electro-

  valves 21 are all connected to these conduits 22 and 23.

  In a possible variant, the remote control box 17 with encoder, connected by a cable 18 to the signal receiver-analyzer 19, can be replaced by a radio remote control box 24, always having the same command coding function.

  control of the different receivers. This telecommut box

  of 24 thus combines a transmitter and an encoder, and it is associated with a receiver-signal amplifier 25, which is itself connected by

  a cable 26 to the signal receiver-analyzer 19.

  FIG. 3 shows how this principle is applicable to a drilling slide 1 which is mounted on an articulated arm (not shown) and which, as already described with reference to FIG. 1, carries various hydraulic receivers such as those

indicated in 2,3,4 and 5.

  From the hydraulic point of view, an electro-valve 21 is

  directly to each receiver 2 to 5, and all these

  Three valves are powered by two hydraulic lines.

  muns 22 and 23 which connect the frame of the machine to the slide

  1. A single pump 27 feeds the conduit to go 22.

  From an electrical point of view, the device of FIG. 3 comprises a cable remote control 18, from a stacker

  17 ?, the receiver-signal analyzer 19 being connected by a cable

  ble only to all electro-valves mounted on the

receptors.

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  As a result, the connection between the chassis of the apparatus

  and the slide 1, schematically connected at 28, comprises in practice

  only two hydraulic hoses, corresponding to the

  22 and 23, and a single cable 20. The number of flexi-

  The hydraulic system is therefore greatly reduced in comparison with the known system described in Figure 1. It should be noted, moreover, that this reduction in the number of hoses in no case, in return, a significant increase in section of the hoses. flexible, because in practice we only feed one or

  two receivers at a time so that the flow of hydraulic fluid

  to be transported is not significantly increased.

  The cable 20 connecting with the electro-valves 21 has a

  more specific structure, shown in Figures 4 and 5.

  This cable contains, on the one hand, the conductors 29 and 30, here in the number of two, necessary for the power supply of the coils of the solenoid valves, and on the other hand, the conductor 31 transmitting the coded signals, which in the example considered

is a simple driver.

  In the case of a machine operating in a normal atmosphere, the section of the cable 20 may be that visible in FIG. 4 to the supply conductors 29 and 30 are simply embedded in the insulator of the hull, and only the transmission conductor

  signals 31 is surrounded by a shield 32, which is required

  to avoid possible pests.

  In the case of a machine operating in an explosive atmosphere, the section of the cable 20 is advantageously that visible in FIG. 5: not only the transmission conductor 31 is

  surrounded by an armor 32, but still all three

  ductors 29, 30 and 31 is surrounded, in addition, an armor 33 for monitoring the cable. It should be noted that in the

  case of application considered here, it is also appropriate to

  see a remote control cabinet 17 (or 24) intrinsically safe

  Sque, an explosion-proof box for the receiver-analyzer

  19 (possibly also for the receiver-amplifier

  25), as well as explosion-proof housings for

  electrical parts of each solenoid valve 21, with presses

  Explosion-proof cable for the different cable outlets.

  FIG. 6 shows, finally, the detail of one of the electro-valves 21 mounted on a hydraulic receiver 2,5 or 4, represented as being a jack. As already indicated above,

  the solenoid valve 21 is interposed on the two hydraulic ducts

  22 and 23 and on the power cable 20, including sections

  We are represented. The electrovalve considered includes

  also a signal decoder 34, associated with a relay of cou-

  from the reel. It goes without saying that the invention is not limited to the embodiments of this remote power supply and control device which have been described above, by way of examples; it embraces, on the contrary, all the variants based on the same principle, whatever the modifications made to the details of realization, such as those of the cable of connection with the electro-valves mounted on the receivers, and whatever also the application envisaged. Thus the sections of the cable 20, shown in FIGS. 4 and 5, are given for information only and may be modified, on the one hand according to the standards in force according to the country,

  on the other hand, depending on the coding system chosen:

  single driver 31, intended to convey a code formed by a succession of unit signals, may be especially replaced

  by a multiple driver, to send a code consisting of

  simultaneous unitary units transmitted in parallel, which combine

  each of the receivers. As for the applica-

  the devices of the invention, they extend in particular to the following areas: machinery used in mines, public works machinery, handling equipment, more or fewer hydraulic receivers can be cylinders, motors or mechanisms of percussion. Finally, the electro-valves 21, which are supposed to be mounted on the

  corresponding receivers in the application examples de-

  can also be integrated into these receivers, by giving

  nant to these a special construction.

Claims (7)

-REVENDICATIONS -   1.- Power and control device & distance for   a plurality of hydraulic receivers, such as cylinders,   hydraulic percussion units or mechanisms, arranged on the same machine, in particular a machine used in the exploitation of mines or a public works machine, characterized in that a hydraulic electro-valve is mounted on the machine close to each receiver, or integrated to this receiver, in that all   the receivers are powered by only two hydrau-   common lice, one to go and one to return, passing through   different electro-valves, and in that all electro-valves   Valves are remotely controlled by means of an electrical cable.   that common, with a single or multiple driver ending to different electro-valves.   2. Device according to claim 1, characterized in that there is provided, at a distance from the receivers, means capable of converting the control commands of the different receivers into coded signals, transmitted over a common electrical conductor, single or multiple, . leading to all the electro-valves, each solenoid valve being associated with a signal decoder circuit, able to excite the coil of the solenoid valve only   when transmitting a signal designating the hydraulic receiver   than corresponding to this electro-valve.   3.- Device according to claim 2, characterized in that it comprises a remote control unit with encoder connected by a cable to a signal analyzer receiver, o by the   common electrical conductor passing through all the electro-   valves mounted near the hydraulic receivers corresponding to   respondents. 4.- Device according to claim 2, characterized in that   it includes a radio remote control box, with   encoder, associated with a receiver-signal amplifier connected by a wire to a receiver-signal analyzer, from   the common electrical conductor passing through all the electro-   mounted near the hydraulic receivers corresponding to respondents.   5 .-- Device according to any one of the claims   2 & 4, characterized in that it comprises a single connecting cable   with all the electro-valves mounted near the corresponding hydraulic receivers, said cable containing, 1084S9895   on the one hand, the electrical conductors for the power supply of the coils of the electro-valves, and on the other hand, the aforementioned conductor, simple or multipletransmettant the   coded signals, this conductor being surrounded by a shield.   6. Device according to claim 5, intended for a machine operating in an explosive atmosphere, characterized in that   all the conductors of the above-mentioned connecting cable are In addition, he wore an armor.   7.- Device according to any one of the claims   1 to 6, characterized by its application to a slide of   ge mounted on an articulated arm and carrying various receivers   such as cylinders, motors or hydraulic percussion mechanisms   a solenoid valve being mounted on each receiver, or integrated in this receiver, and the hydraulic connection between the chassis of the machine and said slide comprising only two hoses.