JP6282127B2 - hydraulic unit - Google Patents

Description

  The present invention relates to a hydraulic unit, and more particularly, to a hydraulic unit for supplying pressurized hydraulic oil to a hydraulic working machine such as a small pile driver.

  As a pile driver which is one of hydraulic working machines, a small pile driver capable of working even in a narrow residential area is often used. Such small pile driving machines are equipped with small engines and hydraulic pumps due to their size limitations. However, in recent years, even with a small pile driver, it is possible to construct a large-diameter steel pipe pile using a large-sized auger as much as possible, for example, a large auger, or to shorten the construction time. It is desired to increase work efficiency. In addition, when the pile driver's engine or hydraulic pump fails and the pile driver cannot travel, the hydraulic circuit of the emergency escape device is connected to the hydraulic circuit of the pile driver, and the hydraulic oil supplied from the emergency escape device The pile driver is caused to run and escape from the work place (for example, see Patent Document 1).

JP 2010-180539 A

  The emergency escape device is indispensable depending on the work place such as a pile driver, but its use frequency is extremely low, and most of them are in a standby state. On the other hand, improvement in work efficiency such as pile driving work is always required.

  Therefore, the present invention can be used for increasing the output of a hydraulic working machine such as a pile driving machine, and can also be used for emergency escape when a failure occurs in the engine or hydraulic pump of the hydraulic working machine. It aims to provide a hydraulic unit.

In order to achieve the above object, a hydraulic unit according to the present invention is a hydraulic unit for supplying hydraulic oil to a hydraulic working machine and using it for output enhancement and emergency escape, and is an engine mounted on the hydraulic working machine. A first control for switching the path of the engine having an output larger than the output of the hydraulic pump, the hydraulic pump having a pressure higher than that of the hydraulic pump mounted on the hydraulic work machine, and the hydraulic fluid boosted by the hydraulic pump driven by the engine A valve and a second control valve, an oil tank for storing hydraulic oil, and a flow rate control means for controlling the flow rate of the hydraulic pump when used for output enhancement and when used for emergency escape , A first shut-off valve provided in a first hydraulic pipe from the discharge side of the hydraulic pump to the P port of the first control valve; and the second control valve from the discharge side of the hydraulic pump. A second shut-off valve provided in a second hydraulic pipe reaching the P port; and a third shut-off valve provided in a third hydraulic pipe extending from the oil tank to the suction side of the hydraulic pump. The first external connection on the valve side is connected to a first A port hydraulic pipe connected to the A port of the first control valve, a first B port hydraulic pipe connected to the B port of the first control valve, and an oil tank. A drain pipe, and a second output hydraulic pipe connected to the output port of the second control valve and a pump suction pipe connected to the suction side of the hydraulic pump at the second external connection portion on the second control valve side And the first shut-off valve and the third shut-off valve are in an open state, and the second shut-off valve and the second external connection portion are in a shut-off state, 1A port hydraulic piping and 1B port of 1 external connection The pressure piping is connected to the forward rotation side and the reverse rotation side of the hydraulic motor provided in the hydraulic work machine, and the drain piping is connected to the drain recovery part of the hydraulic motor and used for emergency escape. The second shutoff valve is in an open state, the first shutoff valve, the third shutoff valve, and the first external connection portion are in a shutoff state, and the second output hydraulic piping of the second external connection portion is The pump is connected to a discharge side of a hydraulic pump mounted on the hydraulic working machine, and the pump suction pipe is connected to an oil tank provided in the hydraulic working machine .

Furthermore, the hydraulic unit of the present invention is characterized in that the electrically operated by a pre Symbol remote controller first control valve is pulled out from the hydraulic unit to the hydraulic working machine.

The hydraulic unit of the present invention, prior Symbol second control valve is the hydraulic working machine to the installed continuously provided the pressure compensated multi-proportional control direction change the number of control valve unit corresponding to the number of installed hydraulic pump It is characterized by being a valve. Further, wherein the first external connecting portion and the connection end of the second external connecting portion, is characterized that you self-sealing couplings are respectively provided.

  According to the hydraulic unit of the present invention, rotation is performed by supplying hydraulic oil from the hydraulic unit to a hydraulic motor provided in a rotary drive device of a hydraulic working machine, for example, a pile driving machine, using the first control valve. Since the driving force of the drive unit can be increased, for example, the time required for pile driving work can be shortened, large diameter piles can be used, and large diameter holes can be excavated. Can be improved. In addition, by supplying hydraulic oil to the discharge side of the hydraulic pump installed in the pile driver using the second control valve, the pile driver can be operated even if the engine or hydraulic pump of the pile driver fails. It can be operated in the same manner as usual, and can escape from the work place.

It is a hydraulic circuit diagram showing an example of one form of the hydraulic unit of the present invention. It is a hydraulic circuit diagram which similarly shows an example of the flow control circuit of a hydraulic pump. It is an electric circuit diagram which similarly shows an example of the electric circuit for control. It is a side view which shows the example of 1 type which connected the hydraulic unit to the pile driver. It is explanatory drawing which shows one example of a hydraulic circuit when the hydraulic unit of this invention is used for the output increase of a pile driver. It is explanatory drawing which shows one example of a hydraulic circuit when the hydraulic unit of this invention is used for emergency escape of a pile driver.

  First, as shown in FIG. 4, the hydraulic unit 11 of the present invention supplies hydraulic oil to a hydraulic working machine, for example, a pile driving machine 51, and is used for output enhancement and emergency escape of the pile driving machine 51. As shown in FIG. 1, the hydraulic circuit of the hydraulic unit 11 shown in the present embodiment is mounted on the engine 12 and the pile driving machine 51 having higher output than the engine mounted on the pile driving machine 51. A hydraulic pump 13 having a higher pressure and flow rate than the hydraulic pump, a first control valve 14 for boosting output that switches the path of hydraulic oil boosted by the hydraulic pump 13 driven by the engine 12, and a plurality of, in this embodiment. And a second control valve 15 for emergency escaping comprising a pressure-compensated multi-proportional control direction switching valve in which four control valve portions 15a, 15b, 15c, 15d are connected.

  The first hydraulic piping 16 extending from the discharge side 13a of the hydraulic pump 13 to the P port 14p of the first control valve 14 is provided with a first shut-off valve 17, and the first cutoff valve 17 is provided from the discharge side 13a of the hydraulic pump 13. 2 A second shutoff valve 19 is provided in the second hydraulic pipe 18 leading to the P port 15 p of the control valve 15, and a third shutoff is provided in the third hydraulic pipe 21 leading from the oil tank 20 to the suction side 13 b of the hydraulic pump 13. A valve 22 is provided. Each of these shut-off valves 17, 19, and 22 is of a type that closes by energizing the solenoids 17S, 19S, and 22S and shuts off each piping flow path. A return pipe 24 having an oil cooler 23 is connected to the T port 14t of the first control valve 14.

  On the side surface of the casing 11 a of the hydraulic unit 11, a first external connection portion 25 used when supplying hydraulic oil to the pile driving machine 51 from the first control valve 14 side, and a pile driving from the second control valve 15 side. A second external connection portion 26 used when supplying hydraulic oil to the machine 51 is provided. The first external connection portion 25 on the first control valve 14 side includes a first A port hydraulic pipe 27 connected to the A port 14a of the first control valve 14 and a first port connected to the B port 14b of the first control valve 14. A 1B port hydraulic pipe 28 and a drain pipe 29 connected to the oil tank 20 are provided, and self-sealing couplings are provided at connection ends of the pipes 27, 28, and 29, respectively.

  On the other hand, the second external connection portion 26 on the second control valve 15 side is connected to each output port (A port or B port) of each control valve portion 15a, 15b, 15c, 15d in the second control valve 15. There are provided four second output hydraulic pipes 31, 32, 33, 34, and a pump suction pipe 35 connected to the suction side 13b of the hydraulic pump 13, and each of the pipes 31, 32, 33, 34, Similarly to the first external connection portion 25, self-sealing couplings are also provided at the connection ends 35. Further, a relief pipe 37 having a relief valve 36 is provided between the discharge side 13 a of the hydraulic pump 13 and the pump suction pipe 35, and the pump suction pipe 35 is provided at the T port 15 t of the second control valve 15. A return pipe 38 to be connected to is connected.

  FIG. 2 shows a flow rate control circuit (flow rate control means) 40 that changes the discharge flow rate of the hydraulic pump 13 when the hydraulic unit 11 is used for output enhancement and when it is used for emergency escape. This flow rate control circuit 40 is connected to the hydraulic pump 13 and driven by the engine 12 and has a small capacity pilot pump 41, a discharge flow rate switching solenoid valve 42, a discharge flow rate control cylinder 43, and a relief valve. 44. When the solenoid 42S of the solenoid valve 42 is energized (the state shown in FIG. 2), hydraulic oil from the pilot pump 41 is supplied to the cylinder 43 in a state in which the pressure is controlled by the relief valve 44, and the piston 43a moves forward. Thus, the discharge flow rate of the hydraulic pump 13 is reduced to, for example, about half of the maximum flow rate. Further, when the solenoid 42S is in a non-energized state, the flow path from the pilot pump 41 is shut off and the hydraulic oil is withdrawn from the cylinder 43, so that the piston 43a moves backward and the discharge flow rate of the hydraulic pump 13 Is set to the maximum flow rate.

  FIG. 3 shows a control electric circuit 45 for selecting by the selection switch 46 whether the hydraulic unit 11 is used for output enhancement or emergency escape. When the selector switch 46 is switched to the output increasing contact 46a side, the solenoid 19S is energized, the second shut-off valve 19 shuts off the second hydraulic pipe 18, and the solenoids 17S, 22S are de-energized. The 1 cutoff valve 17 and the 3rd cutoff valve 22 will be in an open state. At the same time, the solenoid 42S is in a non-energized state and the hydraulic oil is extracted from the cylinder 43, so that the discharge flow rate of the hydraulic pump 13 becomes the maximum flow rate. As a result, the hydraulic pump 13 draws hydraulic oil from the oil tank 20 through the third hydraulic pipe 21, and the maximum flow rate of hydraulic oil boosted by the hydraulic pump 13 passes through the first hydraulic pipe 16 to the first control valve. 14 P ports 14p are supplied.

  In this state, if necessary, the remote control switch 47 pulled out from the hydraulic unit 11 to the vicinity of the hydraulic oil supply destination by an extension cord or the like is operated to the A port side 47a or the B port side 47b, and the first solenoids 14Sa and 14Sb When the control valve 14 is actuated, the pressurized hydraulic fluid is supplied from the A port 14a or the B port 14b of the first control valve 14 to the actuator of the use destination through the first A port hydraulic pipe 27 or the first B port hydraulic pipe 28. Is done. The hydraulic fluid returning from the actuator of the use destination returns to the B port 14b or A port 14a of the first control valve 14 from the first B port hydraulic pipe 28 or the first A port hydraulic pipe 27, passes through the return pipe 24 from the T port 14t, It is cooled by the oil cooler 23 and returned to the oil tank 20. In addition, the hydraulic oil leaked from the drain of the actuator at the usage destination returns to the oil tank 20 through the drain pipe 29.

  When the selection switch 46 is switched to the emergency exit contact 46b, the solenoids 17S, 22S, 42S are energized, and the first shut-off valve 17 and the third shut-off valve 22 shut off the first hydraulic pipe 16 and the third hydraulic pipe 21. At the same time, the solenoid valve 42 is in a state of supplying hydraulic oil to the cylinder 43, so that the discharge flow rate of the hydraulic pump 13 is controlled to about half of the maximum flow rate. As a result, the hydraulic pump 13 sucks the hydraulic oil from the pump suction pipe 35, and the hydraulic oil boosted by the hydraulic pump 13 is supplied to the P port 15 p of the second control valve 15 through the second hydraulic pipe 18. It becomes a state.

  Further, when the second control valve operation switch 48 is turned on in this state, the solenoids 15e, 15f, 15g, 15h of the control valve portions 15a, 15b, 15c, 15d in the second control valve 15 are energized. The control valve portions 15a, 15b, 15c, 15d are opened, and the second output hydraulic pipes 31, 32, 33, 34 are operated from the output ports of the control valve portions 15a, 15b, 15c, 15d. Oil spills. The outflow amount of the hydraulic oil to each of the second output hydraulic pipes 31, 32, 33, 34 can be a flow rate set in advance in each of the control valve portions 15a, 15b, 15c, 15d.

  FIG. 4 shows a state in which the hydraulic unit 11 of the present invention is connected to the pile driver 51. The pile driving machine 51 shown in the present embodiment includes a lower traveling body 52 having a pair of left and right crawlers, an upper revolving body 53 provided on the lower traveling body 52 via a swivel bearing, and an upper revolving body. A leader 54 that can be raised and lowered at the front of 53, a back stay 55 that supports the leader 54 from the rear, a rotary drive device 56 that is a hydraulic working device that can be raised and lowered on the leader 54, and an upper part The revolving unit 53 includes a pair of front jacks 57 provided on the left and right of the front part, a pair of rear jacks 58 provided on the left and right of the rear part, and various other devices. It is configured to operate with hydraulic oil supplied from a hydraulic unit (hereinafter referred to as an internal hydraulic unit) 60 mounted on the vehicle. A hose guide 59 is provided at the rear of the upper swing body 53.

  As shown in FIGS. 5 and 6, the internal hydraulic unit 60 provided in the pile driving machine 51 was discharged from the four hydraulic pumps 62 to 65 driven by the engine 61 and the hydraulic pumps 62 to 65. As a hydraulic device operated by the control valves 66 to 68, a plurality of control valves 66 to 68 for controlling the flow of hydraulic oil and a remote control valve 69 for indirectly operating the control valves 66 to 68 are provided. Traveling hydraulic motors 52RM and 52LM for driving the left and right crawlers of the traveling body 52, a spanner cylinder 52S for changing the left and right crawler intervals, a turning hydraulic motor 53M for swinging the upper swinging body 53, and the longitudinal angle of the reader 54 Of the undulation cylinder 55S and the leader 54 for expanding and contracting the back stay 55 to adjust the A tilt cylinder 54S for adjusting the angle in the right direction, a driving hydraulic motor 56M for rotating the rotation driving device 56, a lifting cylinder 56S for moving the rotation driving device 56 up and down along the reader 54, a front jack 57 and a rear jack 58 are provided. Respective jack cylinders 57S and 58S to be expanded and contracted are provided.

  Further, the internal hydraulic unit 60 shown in this embodiment has an emergency escape pipe for connecting the external hydraulic unit 11 from the downstream side of the check valves 62a to 65a provided in the discharge side pipes of the hydraulic pumps 62 to 65. 62b to 65b are branched and provided in advance, and the oil tank 70 is provided with an emergency escape pipe 70a. Furthermore, the hydraulic piping of the drive hydraulic motor 56M is provided with output switching pipe switching portions 56a to 56c for connecting an external hydraulic unit. Self-sealing couplings that can be attached and detached with one touch are provided at the connection parts of the emergency escape pipes 62b to 65b, 70a and the pipe switching parts 56a to 56c.

  FIG. 5 shows an example in which the hydraulic unit 11 of the present invention (hereinafter sometimes referred to as an external hydraulic unit) 11 is used to increase the output of the rotary drive device 56 in the pile driving machine 51. The first external connection portion 25 and the internal hydraulic unit 60 of the pile driving machine 51 are connected by three hydraulic hoses 71a to 71c. At this time, the 2nd external connection part 26 is in the interruption | blocking state by the effect | action of a self seal coupling. The 1st A port hydraulic piping 27 in the 1st external connection part 25 of the external hydraulic unit 11 is the connection part for right rotation of the drive hydraulic motor 56M via the 1st connection hose 71a, the 1st connection pipe 72a, and the piping switch part 56a. The first B port hydraulic pipe 28 is connected to the left rotation connection part of the drive hydraulic motor 56M via the second connection hose 71b, the second connection pipe 72b, and the pipe switching part 56b. Further, the drain pipe 29 is connected to the drain recovery part of the drive hydraulic motor 56M via the third connection hose 71c, the third connection pipe 72c, and the pipe switching part 56c.

  That is, the hydraulic circuit in the driving hydraulic motor 56 </ b> M of the pile driving machine 51 is changed from the motor pipes 73 a to 73 c of the internal hydraulic unit 60 to the connection pipes 72 a to 72 c for increasing output. In this state, when the selection switch 46 of the external hydraulic unit 11 is switched to the output increasing contact 46a side and both the external hydraulic unit 11 and the internal hydraulic unit 60 of the pile driving machine 51 are operated, the pile driving machine 51 is controlled by the control valve. Each device other than the drive hydraulic motor 56M of the rotary drive device 56 is normally operated by directly operating 66 to 68 with a lever or pedal in the cab or indirectly with a remote control valve 69. Can do. Therefore, pre-construction preparatory work such as running, turning, and adjusting the leader in the front-rear direction and the left-right direction is performed using the internal hydraulic unit 60.

  When the steel pipe pile 81 attached to the rotary drive device 56 is press-fitted into the ground, the remote control switch 47 pulled out from the external hydraulic unit 11 and pulled into the cab is operated. For example, the remote control switch 47 is connected to the A port side. By operating to 47a, the A-side solenoid 14Sa that is the operating portion of the first control valve 14 is operated via a connection wiring (not shown), and the spool is moved in the direction in which the hydraulic oil flows from the P port 14p to the A port 14a. .

  That is, when the remote control switch 47 is operated to the A port side 47 a, in the external hydraulic unit 11, the hydraulic oil sucked from the oil tank 20 and boosted by the hydraulic pump 13 is supplied from the A port 14 a of the first control valve 14 to the first A It is supplied to the drive hydraulic motor 56M through the port hydraulic pipe 27, the first connection hose 71a, the first connection pipe 72a, and the pipe switching unit 56a, and the drive hydraulic motor 56M is rotated clockwise, for example. Thereby, the drive hydraulic motor 56M can be rotated with hydraulic oil having a larger flow rate than the internal hydraulic unit 60, and the press-fitting speed of the steel pipe pile 81 by the rotation drive device 56 can be increased, or the high pressure can be driven. The rotational force can be increased, and a large diameter steel pipe pile 81 can be used.

  In particular, the engine 12 having a larger output than the engine 61 of the pile driving machine 51 drives the hydraulic pump 13 having a high pressure and a large flow rate compared to the hydraulic pumps 62 to 65 of the pile driving machine 51, and the high pressure and high flow rate hydraulic pump. 13 can be used as a driving force for rotating the driving hydraulic motor 56M, so that the output of the driving hydraulic motor 56M can be further enhanced. Furthermore, since the operation of the first control valve 14 can be performed by the switch operation of the remote control switch 47, even when the external hydraulic unit 11 is connected and the output is increased, no special operation is required and normal operation is performed. The pile driving work can be done with the same simple operation.

  The hydraulic oil after rotating the driving hydraulic motor 56M is supplied from the left rotation connecting portion of the driving hydraulic motor 56M to the pipe switching portion 56b, the second connecting pipe 72b, the second connecting hose 71b, and the first B port hydraulic pipe 28. And then returns to the B port 14 b of the first control valve 14, further passes through the T port 14 t, passes through the drain pipe 29, is cooled by the oil cooler 23, and then returns to the oil tank 20. Further, the drain generated by the driving hydraulic motor 56M passes from the drain collecting unit of the driving hydraulic motor 56M to the pipe switching unit 56c, the third connection pipe 72c, and the third connection hose 71c, and from the drain pipe 29 to the oil tank 20. Collected. Accordingly, the hydraulic oil for rotating the drive hydraulic motor 56M circulates in the oil tank 20 of the external hydraulic unit 11 regardless of the hydraulic oil of the internal hydraulic unit 60. The oil amount of each of these oils does not change and can be stably operated for a long time. Further, since the entire amount of the hydraulic oil returns to the oil tank 20 through the oil cooler 23, an increase in the temperature of the hydraulic oil can be suppressed.

  FIG. 6 shows an example in which the external hydraulic unit 11 is used for emergency escape of the pile driving machine 51. Even when the external hydraulic unit 11 is used for emergency escape, the second external connection portion 26 of the external hydraulic unit 11 and the internal hydraulic unit 60 are connected by the five hydraulic hoses 75a to 75e. Thereby, the output ports of the control valve portions 15a to 15d in the second control valve 15 pass through the second output hydraulic pipes 31 to 34, the hydraulic hoses 75a to 75d, and the emergency escape pipes 62b to 65b, respectively. It will be in the state connected to the discharge side piping of -65, respectively. Also in this case, the first external connection portion 25 to which the hydraulic hose is not connected is in a cut-off state due to the action of the self seal coupling.

  At this time, the discharge flow rate of the hydraulic pump 13 is controlled by the flow rate control circuit 40 to, for example, about half of the maximum flow rate, and the discharge flow rate of the first hydraulic pump 62 corresponding to the flow rate from the first control valve unit 15a. The flow rate of the second control valve portion 15b is set to the discharge flow rate of the second hydraulic pump 63, and the flow rate of the third control valve portion 15c is set to the third hydraulic pump. The discharge flow rate of 64 and the flow rate of the fourth control valve portion 15d are set to flow rates corresponding to the discharge flow rate of the fourth hydraulic pump 65, respectively.

  As a result, even if an abnormality occurs in the engine 61 or the hydraulic pumps 62 to 65 of the internal hydraulic unit 60, the hydraulic oil is supplied to the discharge side pipes of the hydraulic pumps 62 to 65. Therefore, by operating the control valves 66 to 68 and the remote control valve 69, each device can be operated in the same manner as in the normal state, and the traveling hydraulic motors 52RM and 52LM are operated to escape from the work site. be able to.

  Further, the hydraulic oil that has actuated each device of the internal hydraulic unit 60 returns to the oil tank 70 as usual, and the hydraulic pump 13 of the external hydraulic unit 11 connects the pump suction pipe 35, the hydraulic hose 75e, and the emergency escape pipe 70a. Since the hydraulic oil is sucked from the oil tank 70 of the internal hydraulic unit 60, the hydraulic oil that operates each device circulates in the oil tank 70 of the internal hydraulic unit 60. Therefore, as in the case of use for output enhancement, there is no change in the oil amount of each of the hydraulic units 11 and 60.

  In this way, in normal work, the efficiency of the pile driving work can be improved by using the external hydraulic unit 11 for increasing the output of the rotation drive device 56, so that the engine and the hydraulic pump of the pile driving machine 51 can be improved. When an abnormality occurs, the external hydraulic unit 11 can be used for emergency escape. Therefore, it is not necessary to prepare two hydraulic units for output enhancement and emergency escape, so that the overall cost required for the pile driving work can be reduced.

  Furthermore, by using a multi-proportional control directional control valve with pressure compensation as the second control valve 15, since it can play a role equivalent to a multiple pump in a pseudo manner, there is no need to install a multiple pump, Not only can the apparatus cost be reduced, but also energy loss can be reduced.

  In this embodiment, a pile driving machine is exemplified as the hydraulic working machine. However, the hydraulic working machine can be applied to various hydraulic working machines such as a ground improvement machine, an earth drill, a crane, and a tubing device. Further, when not used for output enhancement or emergency escape, it is also possible to supply hydraulic oil to the plurality of hydraulic machines from the second control valve 15 side. Further, each shut-off valve may be manually opened and closed.

DESCRIPTION OF SYMBOLS 11 ... Hydraulic unit, 11a ... Casing, 12 ... Engine, 13 ... Hydraulic pump, 13a ... Discharge side, 13b ... Suction side, 14 ... First control valve, 14a ... A port, 14b ... B port, 14p ... P port, 14Sa ... A side solenoid, 14Sb ... B side solenoid, 14t ... T port, 15 ... Second control valve, 15a, 15b, 15c, 15d ... Control valve part, 15e, 15f, 15g, 15h ... Solenoid, 15p ... P port , 15t ... T port, 16 ... first hydraulic piping, 17 ... first cutoff valve, 17S ... solenoid, 18 ... second hydraulic piping, 19 ... second cutoff valve, 19S ... solenoid, 20 ... oil tank, 21 ... first 3 hydraulic piping, 22 ... third shut-off valve, 22S ... solenoid, 23 ... oil cooler, 24 ... return piping, 25 ... first external connection, 26 ... second external connection, 27 1st A port hydraulic piping, 28 ... 1st B port hydraulic piping, 29 ... Drain piping, 31, 32, 33, 34 ... 2nd output hydraulic piping, 35 ... Pump suction piping, 36 ... Relief valve, 37 ... Relief piping, 38 Return pipe, 40 ... Flow control circuit, 41 ... Pilot pump, 42 ... Solenoid valve, 42S ... Solenoid, 43 ... Cylinder, 43a ... Piston, 44 ... Relief valve, 45 ... Electric circuit for control, 46 ... Selection switch, 46a ... contact for output augmentation, 46b ... contact for emergency escape, 47 ... remote control switch, 47a ... A port side, 47b ... B port side, 48 ... second control valve operation switch, 51 ... pile driver, 52 ... undercarriage , 52RM, 52LM ... travel hydraulic motor, 52S ... spanner cylinder, 53 ... upper turning body, 53M ... turning hydraulic motor, 54 ... leader, 54 ... Tilt cylinder, 55 ... Backstay, 55S ... Rolling cylinder, 56 ... Rotary drive device, 56a, 56b, 56c ... Pipe switching unit, 56M ... Driving hydraulic motor, 56S ... Elevating cylinder, 57 ... Front jack, 57S ... Jack Cylinder, 58 ... Rear jack, 58S ... Jack cylinder, 59 ... Hose guide, 60 ... Internal hydraulic unit, 61 ... Engine, 62-65 ... Hydraulic pump, 62a-65a ... Check valve, 62b-65b ... Emergency escape piping, 66-68 ... control valve, 69 ... remote control valve, 70 ... oil tank, 70a ... emergency escape piping, 71a-71c ... hydraulic hose, 72a-72c ... connection piping, 73a, 73b ... motor piping, 75a-75e ... Hydraulic hose, 81 ... steel pipe pile

Claims (4)

In a hydraulic unit for supplying hydraulic oil to a hydraulic work machine and using it for output enhancement and emergency escape , an engine having an output larger than the output of the engine mounted on the hydraulic work machine, and the hydraulic work A hydraulic pump capable of discharging hydraulic oil at a high pressure and a large flow rate from a hydraulic pump mounted on the machine, a first control valve and a second control valve for switching a path of the hydraulic oil boosted by the hydraulic pump driven by the engine, An oil tank for storing hydraulic oil; and a flow rate control means for controlling the flow rate of the hydraulic pump when used for output augmentation and when used for emergency escape, and from the discharge side of the hydraulic pump A first shut-off valve provided in the first hydraulic pipe reaching the P port of the first control valve, and a second hydraulic pipe extending from the discharge side of the hydraulic pump to the P port of the second control valve. Comprising a second shut-off valve that is kicked, and a third shut-off valve provided in the third hydraulic pipe extending from the oil tank to the suction side of the hydraulic pump,
The first external connection on the first control valve side includes a first A port hydraulic pipe connected to the A port of the first control valve, a first B port hydraulic pipe connected to the B port of the first control valve, and oil A drain pipe connected to the tank is provided, and the second external connection portion on the second control valve side is connected to the second output hydraulic pipe connected to the output port of the second control valve and the suction side of the hydraulic pump. a pump suction pipe to be formed,
When used for output enhancement, the first shut-off valve and the third shut-off valve are in an open state, and the second shut-off valve and the second external connection portion are in a shut-off state, and the first external connection portion The first A port hydraulic piping and the first B port hydraulic piping are respectively connected to the forward rotation side and the reverse rotation side of the hydraulic motor provided in the hydraulic work machine, and the drain piping is connected to the drain collecting portion of the hydraulic motor. Connected,
When used for emergency escape, the second shut-off valve is open, and the first shut-off valve, the third shut-off valve, and the first external connection part are shut off, and the second external connection part The second output hydraulic pipe is connected to a discharge side of a hydraulic pump mounted on the hydraulic work machine, and the pump suction pipe is connected to an oil tank provided in the hydraulic work machine. A hydraulic unit characterized by the above. Wherein the first control valve, a hydraulic unit according to claim 1, wherein the electrically operated by a remote controller drawn from the hydraulic unit to the hydraulic working machine. The second control valve is a multi-proportional control direction switching valve with pressure compensation in which a number of control valve portions corresponding to the number of installed hydraulic pumps mounted on the hydraulic working machine are connected. Item 3. The hydraulic unit according to Item 1 or 2 . Wherein the first external connecting portion and the connection end of the second external connecting portion, self-sealing coupling hydraulic unit according to any one of claims 1 to 3, characterized in that are provided.

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