JP2010216619A - Hydraulic circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching type hydraulic circuit for driving by connecting an oil tank unit to a selected hydraulic driving device between the oil tank unit and a plurality of hydraulic driving devices. <P>SOLUTION: This hydraulic circuit has a tank unit 15 having a circulating circuit 13 for circulating oil of an oil storage tank 11 and a flushing means 14 for removing foreign matter in the oil, and a hydraulic control unit 25 having a high pressure pump 21 arranged in close vicinity to a valve stand 18 of an actuator 17 and pressurizing the oil flowing in from a connecting pipe 20 connected to the circulating circuit 13 via a first self-seal coupling 19, a high pressure pipe 22 supplying the oil from the high pressure pump 21 to the valve stand 18 and a return pipe 24 connected to the valve stand 18, connected to the circulating circuit 13 via a second self-seal coupling 23 and making the oil from the actuator 17 flow in the circulating circuit 13. A bypass circuit 27 is arranged via a switching valve 26 between the connecting pipe 20 and the return pipe 24. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a hydraulic circuit, and more particularly, to a switchable hydraulic circuit that connects and drives an oil tank unit to a selected hydraulic drive device between an oil tank unit and a plurality of hydraulic drive devices.

Conventionally, as shown in FIG. 2, it is difficult to secure an installation space around each hydraulic drive device 70 in each hydraulic drive device 70 provided in each facility of the production line. A common large-capacity pressure source (power unit) 71 is installed at the same location. When driving the hydraulic drive device 70, high-pressure oil sent from the pressure source 71 is supplied to the valve stand 73 provided in the hydraulic drive device 70 using the high-pressure pipe 72, and the pressure and flow rate are supplied by the valve stand 73. Etc. are supplied to the actuator 74 of the hydraulic drive device 70 after adjustment. The low-pressure oil that has passed through the actuator 74 is returned to the pressure source 71 via the return pipe 75.

Here, the pressure source 71 includes an oil storage tank 76 that stores oil, and a main (high pressure) circuit 77 that sends high-pressure oil to the high-pressure pipe 72, and the main circuit 77 includes oil in the oil storage tank 76. A filter 78 that removes foreign matter contained therein, a high-pressure pump 79 that pressurizes and sends oil that has passed through the filter 78, and a receiving pipe that is connected to the return pipe 75 and returns oil flowing out from the return pipe 75 to the oil storage tank 76. 80 is provided. Furthermore, the pressure source 71 has a circulation circuit 84 that takes out the oil in the oil storage tank 76 via the low-pressure pump 81, removes foreign matter in the oil with the filter 82, cools it with the cooler 83, and returns it to the oil storage tank 76. ing. Reference numeral 85 is a high-pressure pressure gauge for measuring the pressure of oil delivered from the high-pressure pump 79, and reference numeral 86 is a low-pressure pressure gauge for measuring the pressure of oil flowing in the circulation circuit 84. Reference numeral 87 denotes a self-sealing coupling that connects the outlet side of the main circuit 77 and the high-pressure pipe 72, and reference numeral 88 denotes a self-sealing coupling that connects the return pipe 75 and the receiving pipe 79.

Patent Document 1 discloses a hydraulic circuit using a high and low pressure two-stage pump in which oil in an oil storage tank is sent to a high pressure pump by a low pressure pump, and the oil is made high pressure by a high pressure pump and supplied to an actuator. Yes. Referring to this hydraulic circuit, instead of the high pressure pump 79 of FIG. 2, as shown in FIG. 3, a low pressure pump 89 provided on the oil storage tank 76 side, a high pressure pump 90 provided on the valve stand 73 side, It is also possible to use a main circuit 93 having a connection pipe 91 for connecting the pump 89 and the high-pressure pump 90 and connecting the connection pipe 91 and the outlet side of the low-pressure pump 89 via a self-seal coupling 92. Conceivable.

JP 2002-54605 A

However, when the main circuit 77 of FIG. 2 is used, when the distance between the hydraulic drive device 70 and the pressure source 71 is long, the high-pressure piping that connects the valve stand 73 on the hydraulic drive device 70 side to the outlet side of the main circuit 77. There is a problem that the length of 72 becomes long and the equipment cost increases. Further, when another hydraulic drive device is driven from the hydraulic drive device 70, the high-pressure pipe 72 and the return pipe 75 are removed, and the high-pressure pipe and the return pipe respectively connected to the valve stand of the other hydraulic drive apparatus are connected. An operation for connecting to the main circuit 77 is required, and at this time, a problem arises in that foreign matters such as dust and dust enter the pipe from the self-seal couplings 88 and 87.

On the other hand, when the main circuit 93 of FIG. 3 is used, the high-pressure pump 90 is provided on the valve stand 73 side, so that the length of the high-pressure pipe 94 connecting the valve stand 73 and the high-pressure pump 90 is shortened. Although it is possible to reduce the cost, when another hydraulic drive device is driven from the hydraulic drive device 70, a connection pipe 91 connected to the outlet side of the low-pressure pump 89, and a receiving pipe 80 of the main circuit 93 The return pipe 75 to be connected needs to be disconnected and disconnected from the self-seal couplings 88 and 92, respectively, to connect the connection pipe and the return pipe of another hydraulic drive device. The problem that foreign matters such as dust and dust enter the pipe from the rings 88 and 92 cannot be solved.

The present invention has been made in view of such circumstances, and it is possible to remove foreign matter that enters between the oil tank unit and the plurality of hydraulic drive devices when the selected hydraulic drive device is connected to the oil tank unit. An object is to provide a possible low-cost switching hydraulic circuit.

A hydraulic circuit according to the present invention that meets the above-described object is a tank including an oil storage tank, a circulation circuit that circulates oil in the oil storage tank via a low-pressure pump, and flushing means that removes foreign matter in the oil in the oil storage tank. Unit,
Using a connection pipe that is arranged close to a valve stand that controls oil supplied to an actuator provided in a hydraulic drive device and that is connected to the circulation circuit on the downstream side of the low-pressure pump via a first self-seal coupling. A high-pressure pump that pressurizes oil flowing in, a high-pressure pipe that supplies high-pressure oil supplied from the high-pressure pump to the inlet side of the valve stand, and one end connected to the outlet side of the valve stand, and the other end Is connected to the circulation circuit downstream of the position where the first self-sealing coupling is provided via a second self-sealing coupling, and the oil discharged from the actuator flows into the circulation circuit. A hydraulic control unit with a return pipe,
A bypass circuit is provided between the connection pipe and the return pipe for connecting the connection pipe and the return pipe via a switching valve provided in the connection pipe.

In the hydraulic circuit according to the present invention, the flushing means includes a filter that removes foreign matters and a cooler that cools oil, and is provided in a region downstream from the low-pressure pump and upstream from the first self-seal coupling. It can be provided in the circulation circuit.

In the hydraulic circuit according to the present invention, the discharge amount of the low-pressure pump is preferably larger than the discharge amount of the high-pressure pump.

In the hydraulic circuit according to the present invention, the hydraulic control unit having the high-pressure pump and the high-pressure pipe is disposed close to the valve stand of the actuator provided in the hydraulic drive device even if the hydraulic drive device exists at a location away from the tank unit. Therefore, the length of the high-pressure pipe for supplying high-pressure oil from the high-pressure pump to the valve stand can be shortened, and the equipment cost (high-pressure pipe installation cost) can be reduced.
Further, when the hydraulic control unit is detached from the tank unit and the hydraulic control unit of another hydraulic drive device is connected, the first and second self-seal couplings are released when the first and second self-seal couplings are released. Even if foreign matter such as dust or dirt enters the circulation circuit, connection piping, and return piping from the valve, the oil from the tank unit (oil storage tank) is bypassed by operating the switching valve before driving another hydraulic drive unit. By flowing into the circuit and returning to the oil storage tank via the return pipe, foreign matter can flow into the oil storage tank and be removed by the flushing means provided in the tank unit, and provided in the hydraulic drive device and the hydraulic control unit. It is possible to prevent malfunction and breakage of hydraulic equipment.

In the hydraulic circuit according to the present invention, the flushing means includes a filter that removes foreign matter and a cooler that cools oil, and is provided in a circulation circuit in a region downstream from the low-pressure pump and upstream from the first self-sealing coupling. If provided, the circulation flow in the circulation circuit can be used to remove foreign matter and adjust the oil temperature, simplifying the tank unit configuration and reducing the cost of the tank unit, and removing foreign matter. The temperature-controlled oil can then flow into the connecting pipe.

In the hydraulic circuit according to the present invention, when the discharge amount of the low pressure pump is larger than the discharge amount of the high pressure pump, the oil amount required by the actuator of the hydraulic drive device can be reliably supplied to the hydraulic control unit.

It is explanatory drawing of the hydraulic device which concerns on one embodiment of this invention. It is explanatory drawing of the pressure source for the hydraulic drive device which concerns on a prior art example. It is explanatory drawing of the pressure source for the hydraulic drive device which concerns on another prior art example.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, a hydraulic circuit 10 according to an embodiment of the present invention includes an oil storage tank 11, a circulation circuit 13 that circulates oil in the oil storage tank 11 via a low-pressure pump 12, and an oil storage tank 11. The tank unit 15 is provided with flushing means 14 for removing foreign matter in the oil.

The hydraulic circuit 10 is disposed close to a valve stand 18 that controls oil supplied to an actuator 17 provided in the hydraulic drive device 16, and the first self-seal cup is connected to the circulation circuit 13 on the downstream side of the low-pressure pump 12. A high-pressure pump 21 that pressurizes oil flowing in through a connection pipe 20 connected through a ring 19; a high-pressure pipe 22 that supplies high-pressure oil supplied from the high-pressure pump 21 to the inlet side of the valve stand 18; One end is connected to the exit side of the stand 18, and the other end is connected to the circulation circuit 13 on the downstream side of the first self-seal coupling 19 via the second self-seal coupling 23. It has a hydraulic control unit 25 including a return pipe 24 through which discharged oil flows into the circulation circuit 13.

In the hydraulic control unit 25, a bypass circuit (bypass pipe) 27 connecting the connection pipe 20 and the return pipe 24 via a switching valve 26 provided in the connection pipe 20 between the connection pipe 20 and the return pipe 24. Is provided. The low pressure pump 12 and the high pressure pump 21 are selected so that the discharge amount of the low pressure pump 12 is larger than the discharge amount of the high pressure pump 21. As a result, the amount of oil required by the actuator 17 of the hydraulic drive device 16 can be reliably supplied to the hydraulic control unit 25.

The flushing means 14 includes a filter 28 that removes foreign matter and a cooler 29 that cools oil, and the circulation circuit 13 in a region downstream from the low-pressure pump 12 and upstream from the first self-seal coupling 19. For example, a filter 28 is provided upstream and a cooler 29 is provided immediately downstream of the filter 28. Thereby, the configuration of the tank unit 15 can be simplified, foreign matters can be removed and the oil temperature can be adjusted using the circulating flow in the circulation circuit 13, and the oil whose temperature has been removed from the foreign matters has been removed is connected to the connecting pipe 20. Can be allowed to flow into. Furthermore, from the second attachment portion 31 of the circulation circuit 13 to which the second self-sealing coupling 23 is attached, and downstream of the first attachment portion 30 of the circulation circuit 13 to which the first self-sealing coupling 19 is attached. A flow rate adjustment valve 32 is provided in the circulation circuit 13 in the upstream region. Thereby, the flow rate of the oil in the circulation circuit 13 and the flow rate of the oil flowing into the connection pipe 20 can be adjusted.

Then, the effect | action of the hydraulic circuit 10 which concerns on one embodiment of this invention is demonstrated.
As shown in FIG. 1, even if the hydraulic drive device 16 exists at a location away from the tank unit 15, the hydraulic control unit 25 is disposed close to the valve stand 18 of the actuator 17 provided in the hydraulic drive device 16. Therefore, the length of the high-pressure pipe 22 that supplies high-pressure oil from the high-pressure pump 21 to the valve stand 18 can be shortened. Thereby, the installation expense of the high voltage | pressure piping 22 can be reduced. Further, in the tank unit 15, the oil in the oil storage tank 11 is circulated in the circulation circuit 13 by operating the low-pressure pump 12, thereby removing the foreign matter in the oil with the filter 28 of the flushing means 14 and cooling the oil. The oil cooled to the set temperature at 29 can be returned to the oil storage tank 11.

Here, when the switching valve 26 is operated to cut off the connection between the connection pipe 20 and the bypass circuit 27 and the flow rate adjustment valve 32 is throttled, a part of the oil cooled to the set temperature by the cooler 29 is removed. The high-pressure pump 21 can be supplied using a connecting pipe 20 connected via a self-seal coupling 19. Then, high-pressure oil sent from the high-pressure pump 21 is supplied to the valve stand 18 through the high-pressure pipe 22, and the pressure, flow rate, etc. are adjusted by the valve stand 18 and then supplied to the actuator 17 of the hydraulic drive device 16. Thus, the actuator 17 can be driven. The low-pressure oil that has passed through the actuator 17 has a return pipe 24 having one end connected to the outlet side of the valve stand 18 and the other end connected to the circulation circuit 13 via a second self-seal coupling 23. It can be used to flow into the circulation circuit 13 and return to the oil storage tank 11.

On the other hand, when the hydraulic drive device 16 is to be newly operated, the first and second self-seal couplings 19 and 23 are connected to the hydraulic control unit 25 and the tank unit 15 of the hydraulic drive device 16 that has been operated. To release. Then, the hydraulic control unit 25 and the tank unit 15 of the new hydraulic drive device 16 are connected via the first and second self-seal couplings 19 and 23. At this time, there is a high possibility that foreign matters such as dust and dirt enter the circulation circuit 13, the connection pipe 20, and the return pipe 24 from the first and second self-seal couplings 19 and 23. For this reason, before driving the hydraulic drive device 16, the switching valve 26 is operated so that the oil that has entered the inlet side region of the connecting pipe 20 from the tank unit 15 flows into the bypass circuit 27 and exits the return pipe 24. A flow path returning to the oil storage tank 11 via the region is formed, and the low-pressure pump 12 is operated.

As a result, the flow of oil returning to the oil storage tank 11 via the connection pipe 20, the bypass circuit 27 and the return pipe 24 and the flow of oil returning to the oil storage tank 11 via the flow rate adjustment valve 32 cause the first, When the second self-seal couplings 19 and 23 are disconnected, foreign matter that has entered the circulation circuit 13, connection pipe 20, and return pipe 24 from the first and second self-seal couplings 19 and 23 is stored in the oil storage tank 11. Can be moved in. The foreign matter that has moved into the oil storage tank 11 is sucked together with the oil in the oil storage tank 11 by the low-pressure pump 12 and can be removed by the filter 28 of the flushing means 14 incorporated in the circulation circuit 13. As a result, it is possible to prevent malfunction and breakage of the hydraulic equipment provided in the newly connected hydraulic drive device 16 and hydraulic control unit 25.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the present embodiment, each of the first and second self-sealing couplings is provided in the circulation circuit, but a plurality of first and second self-sealing couplings may be provided. By providing a plurality of first and second self-sealing couplings, the hydraulic control units of a plurality of hydraulic drive devices can be connected to the tank unit, and the plurality of hydraulic drive devices can be driven simultaneously.

10: Hydraulic circuit, 11: Oil storage tank, 12: Low pressure pump, 13: Circulation circuit, 14: Flushing means, 15: Tank unit, 16: Hydraulic drive device, 17: Actuator, 18: Valve stand, 19: First Self-sealing coupling, 20: connection piping, 21: high-pressure pump, 22: high-pressure piping, 23: second self-sealing coupling, 24: return piping, 25: hydraulic control unit, 26: switching valve, 27: bypass circuit , 28: filter, 29: cooler, 30: first mounting portion, 31: second mounting portion, 32: flow rate adjusting valve

Claims (3)

A tank unit comprising an oil storage tank, a circulation circuit for circulating the oil in the oil storage tank via a low-pressure pump, and a flushing means for removing foreign matter in the oil in the oil storage tank;
Using a connection pipe that is arranged close to a valve stand that controls oil supplied to an actuator provided in a hydraulic drive device and that is connected to the circulation circuit on the downstream side of the low-pressure pump via a first self-seal coupling. A high-pressure pump that pressurizes oil flowing in, a high-pressure pipe that supplies high-pressure oil supplied from the high-pressure pump to the inlet side of the valve stand, and one end connected to the outlet side of the valve stand, and the other end Is connected to the circulation circuit downstream of the position where the first self-sealing coupling is provided via a second self-sealing coupling, and the oil discharged from the actuator flows into the circulation circuit. A hydraulic control unit with a return pipe,
A hydraulic circuit characterized in that a bypass circuit for connecting the connection pipe and the return pipe is provided between the connection pipe and the return pipe via a switching valve provided in the connection pipe. 2. The hydraulic circuit according to claim 1, wherein the flushing means includes a filter that removes foreign matters and a cooler that cools oil, and is located downstream of the low-pressure pump and upstream of the first self-sealing coupling. The hydraulic circuit is provided in the circulation circuit. 3. The hydraulic circuit according to claim 1, wherein a discharge amount of the low-pressure pump is larger than a discharge amount of the high-pressure pump. 4.

Images