JP2017008604A - Hydraulic work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic work machine that has a hydraulic circuit for emergency escape applicable to two types of emergency escape devices.SOLUTION: A hydraulic work machine has a supply pipe connection circuit 21 and a hydraulic oil suction connection circuit 25, which are applicable to a first emergency escape device 31 that uses a hydraulic oil in a hydraulic oil tank 18 of the hydraulic work machine when the hydraulic work machine such as a pile driver 11 is made to escape. The hydraulic work machine also has a supply pipe connection circuit and a return pipe connection circuit 23, which are applicable to a second emergency escape device that uses the hydraulic oil in the hydraulic oil tank of the emergency escape device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic working machine, and more specifically, even if an abnormality occurs in an engine or a hydraulic pump during work and self-propulsion becomes impossible, the hydraulic working machine can be escaped from a work place to a safe place. It relates to work equipment.

  Equipped with a traveling device and a working device that are operated by hydraulic oil supplied from a hydraulic pump driven by an engine via a hydraulic control unit such as a control valve for laying and maintenance work of railway tracks, maintenance work of surrounding facilities, etc. A hydraulic working machine is used. Usually, the work on the railway track is performed after the last train passes and before the first train starts operation, and it is necessary to promptly evacuate from the railway track after the work is completed.

  In addition, when working on railway tracks such as under overhead lines, overpasses, and tunnels, hydraulic oil can be supplied to the traveling equipment due to an abnormality in the hydraulic work machine engine or hydraulic pump for some reason. In the event that the hydraulic work machine cannot be withdrawn from the railway track, the emergency work device for operating the hydraulic work machine from the outside and causing the hydraulic work machine to escape from the railway track is put on standby. (For example, refer to Patent Documents 1 and 2).

JP 2010-180537 A JP 2010-180540 A

  The emergency escape device described in Patent Documents 1 and 2 uses, as an emergency escape device, a hydraulic work machine having the same configuration as the hydraulic work machine to be escaped and a hydraulic unit that supplies hydraulic oil to various hydraulic devices Because it has been modified so that it can, it has a hydraulic pump that boosts hydraulic oil, an engine that drives the hydraulic pump, a hydraulic oil tank that stores hydraulic oil, a hose reel that winds a hydraulic hose for connecting the hydraulic circuit, etc. The hydraulic oil sucked from the hydraulic oil tank in the emergency escape device is boosted by the hydraulic pump and supplied to the hydraulic work machine via the supply-side hydraulic hose, and the used hydraulic oil is returned to the return-side hydraulic hose. Is circulated to the hydraulic oil tank in the emergency escape device. Therefore, it is necessary to provide the hydraulic work machine to be escaped with a hydraulic circuit for returning the hydraulic oil supplied from the emergency escape device to the emergency escape device after use.

  On the other hand, as the hydraulic oil necessary for escaping the hydraulic work machine, it is possible to use the hydraulic oil stored in the hydraulic oil tank in the hydraulic work machine. When using this hydraulic oil, It is not necessary to provide a hydraulic oil tank in the emergency escape device. In this case, the emergency escape device has only the hydraulic pump and the engine in the simplest configuration. However, in order to use the hydraulic oil stored in the hydraulic oil tank in the hydraulic work machine to be escaped for emergency escape, the hydraulic pump of the emergency escape device sucks the hydraulic oil from the hydraulic oil tank in the hydraulic work machine It is necessary to provide a hydraulic circuit.

  That is, the emergency escape device uses a hydraulic circuit in the hydraulic working machine when using the hydraulic oil in the hydraulic oil tank in the emergency escape device, and a hydraulic pressure when using the hydraulic oil in the hydraulic oil tank in the hydraulic working machine. Therefore, it is necessary to prepare a hydraulic working machine having a hydraulic circuit corresponding to the type of emergency escape device used at the work site.

  Then, this invention aims at providing the hydraulic working machine provided with the hydraulic circuit for emergency escapes which can respond to any of two types of emergency escape apparatuses.

  In order to achieve the above object, the hydraulic working machine of the present invention is the hydraulic working machine operated by hydraulic oil supplied from a hydraulic pump driven by an engine via a hydraulic circuit having a hydraulic control unit. The circuit is provided in a supply pipe connection circuit branched from a discharge pipe for supplying hydraulic oil from the hydraulic pump to the hydraulic control unit, and in a pipe between the branch point of the supply pipe connection circuit and the hydraulic pump. A means for regulating the flow of hydraulic oil in the pump direction, a return pipe connection circuit branched from the hydraulic oil return pipe for returning the used hydraulic oil to the hydraulic oil tank, and a branch point of the return pipe connection circuit A return direction switching valve that switches the return direction of hydraulic oil between the hydraulic oil tank direction and the return pipe connection circuit direction, and a hydraulic oil suction connection circuit that sucks hydraulic oil in the hydraulic oil tank, When the hydraulic work machine has a failure, the first emergency escape device that uses the hydraulic oil in the hydraulic oil tank of the hydraulic work machine is used to make the hydraulic work machine emergency escape. The hydraulic oil discharged from the hydraulic pump of the emergency escape device is supplied to the hydraulic control unit via the supply pipe connection circuit, and the return direction of the hydraulic oil after use is returned to the hydraulic oil return pipe by the return direction switching valve. The used hydraulic oil is returned to the hydraulic oil tank of the hydraulic work machine, and the hydraulic oil in the hydraulic oil tank is supplied to the hydraulic pump of the first emergency escape device via the hydraulic oil suction connection circuit. When the hydraulic work machine breaks down, the hydraulic work machine is operated using the second emergency escape device that uses the hydraulic oil in the hydraulic oil tank of the second emergency escape device. When making an emergency escape, the second The hydraulic oil discharged from the hydraulic pump of the emergency escape device is supplied to the hydraulic control unit via the supply pipe connection circuit, and the return direction of the used hydraulic oil is returned to the return pipe connection circuit by the return direction switching valve. Set, return the used hydraulic oil to the hydraulic oil tank of the second emergency escape device via the hydraulic oil return pipe, and supply the hydraulic oil in the hydraulic oil tank via the hydraulic oil suction connection circuit It sets so that it may inhale with the hydraulic pump of a said 2nd emergency escape apparatus.

  Further, in the hydraulic work machine of the present invention, the supply pipe connection circuit, the return pipe connection circuit, and the hydraulic oil suction connection circuit are connected to a hydraulic hose for connecting to the hydraulic circuit of the emergency escape device. It is characterized by having a self-sealing coupling.

  According to the hydraulic working machine of the present invention, the emergency escape device to be used in the event of a failure can correspond to either one having no hydraulic oil tank or one having a hydraulic oil tank, and is disposed at a work site. In any case of the emergency escape device, the failed hydraulic working machine can be escaped.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a hydraulic circuit diagram showing a state in which an emergency escape device that does not have a hydraulic oil tank is connected, showing an example of a hydraulic working machine according to the present invention. Similarly, it is a hydraulic circuit diagram which shows the state which connected the emergency escape apparatus which has a hydraulic-oil tank.

  This embodiment exemplifies a pile driving machine as a hydraulic working machine, and the pile driving machine 11 shown in this embodiment is provided with an upper turning body so as to be able to turn on a lower traveling body, and the upper turning The body is provided with various devices necessary for the pile driving work and an engine-driven hydraulic circuit having control means for operating them.

  The hydraulic circuit 12 provided in the pile driving machine 11 is provided in a plurality of hydraulic pumps 14 driven by the engine 13, traveling means and turning means for the lower traveling body, auger lifting and lowering means, auger rotating means, winch, and the like. A plurality of hydraulic motors 15, a plurality of hydraulic cylinders 16 provided in the leader raising / lowering means, tilting means, jack means, chuck means, etc., and control valves and solenoid valves for controlling the flow of hydraulic oil to these devices Provided with a hydraulic control unit 17 including a plurality of various valves, a hydraulic oil tank 18 that stores hydraulic oil, and a hydraulic pipe that connects these various devices, and an operation lever provided on a driver's cab or a remote controller. By operating each hydraulic control unit 17 using a switch or a switch, the pile driving machine 11 can be run, the upper turning body can be turned, pile driving work, etc. It is formed so as to obtain.

  Furthermore, the hydraulic circuit 12 includes a supply pipe connection circuit 21 branched from a discharge pipe 14a for supplying hydraulic fluid whose pressure has been raised from a plurality of hydraulic pumps 14 to corresponding hydraulic control units 17 as emergency escape hydraulic circuits. A check valve 22 which is provided in the discharge pipe 14a between the branch point 21a of the supply pipe connection circuit 21 and the hydraulic pump 14 and is a means for regulating the flow of hydraulic oil in the direction of the hydraulic pump 14; A return pipe connection circuit 23 branched from the hydraulic oil return pipe 19 for returning the hydraulic oil used in the equipment to the hydraulic oil tank 18, and a return point of the hydraulic oil provided at a branch point 23a of the return pipe connection circuit 23 A return direction switching valve 24 that switches between the direction of the hydraulic oil tank 18 and the direction of the return pipe connection circuit 23, and hydraulic oil in the emergency escape device for transferring the hydraulic oil in the hydraulic oil tank 18. Pump and a hydraulic oil inlet connection circuit 25 for sucking is. At the branching point 23a between the hydraulic oil return pipe 19a and the return pipe connection circuit 23 of the pilot hydraulic circuit, an opening / closing valve 24a that opens and closes the hydraulic circuit to the hydraulic oil tank 18 instead of the return direction switching valve. Is provided.

  In addition, the supply pipe connection circuit 21, the return pipe connection circuit 23, and the hydraulic oil suction connection circuit 25 each have a self-seal coupling 26 at a connection portion with a hydraulic hose for connection to a hydraulic circuit of an emergency escape device. The circuit is opened only when the hydraulic hose is connected, and the circuit is closed when the hydraulic hose is not connected.

  In the normal single working state of the pile driver 11, the hydraulic hose from the emergency escape device is not connected to each connection circuit, and the return direction switching valve 24 has a hydraulic oil return direction of the hydraulic oil tank 18. The on-off valve 24a is set in an open state. The hydraulic oil having a predetermined pressure discharged from each hydraulic pump 14 to the discharge pipe 14 a passes through the check valve 22 and is supplied to the corresponding hydraulic control unit 17. At this time, since the front end of the supply pipe connection circuit 21 is closed by the self-seal coupling 26, the hydraulic oil does not flow into the supply pipe connection circuit 21. The hydraulic oil supplied from the hydraulic control units 17 to the various devices returns to the hydraulic oil tank 18 through the hydraulic oil return pipes 19 and 19a after use. The hydraulic oil in the hydraulic oil tank 18 is sucked into each hydraulic pump 14 through a suction pipe (not shown) and circulated. Thereby, the pile driving machine 11 can perform a normal pile driving work alone.

  When the work cannot be continued due to a failure of the engine 13 or the hydraulic pump 14 of the pile driving machine 11 and the work place cannot be retreated, the first emergency escape device 31 shown in FIG. 1 or the second emergency escape shown in FIG. Using the device 51, the pile driver 11 is allowed to escape from the work place to a predetermined shelter.

  First, the first emergency escape device 31 shown in FIG. 1 is an emergency escape device having a simple structure that does not have a hydraulic oil tank, and the number of escape hydraulic pressures necessary for making the pile driver 11 escape. A pump 32, an engine 33 for driving the escape hydraulic pump 32, and self-seal couplings 34 provided on the discharge pipe 32a and the suction pipe 32b of the escape hydraulic pump 32, respectively, are provided.

  The first emergency escape device 31 includes a gap between the self seal coupling 34 and the self seal coupling 26 of the supply pipe connection circuit 21 and the hydraulic oil suction connection circuit 25 provided in the pile driving machine 11. Each is connected by a hydraulic hose 41. However, a hydraulic hose is not connected to the return pipe connection circuit 23, and the return pipe connection circuit 23 is closed by a self-seal coupling 26. Further, the return direction switching valve 24 remains in the direction of the hydraulic oil tank 18 and the on-off valve 24a remains open.

  When the first emergency escape device 31 is operated in a state where each hydraulic hose 41 is connected and hydraulic oil of a predetermined pressure is supplied from the hydraulic pump 32 for escape, each hydraulic oil passes through the hydraulic hose 41 from each discharge pipe 32a. It is supplied to the supply piping connection circuit 21 through. The hydraulic oil supplied to the supply piping connection circuit 21 does not flow in the direction of the hydraulic pump 14 of the pile driving machine 11 by the check valve 22 but is supplied to the hydraulic control unit 17. The hydraulic oil supplied from the hydraulic control units 17 to various devices returns to the hydraulic oil tank 18 through the hydraulic oil return pipe 19 after use. The hydraulic oil in the hydraulic oil tank 18 is sucked into the hydraulic oil suction connection circuit 25, passes through the hydraulic hose 41, is sucked into each escape hydraulic pump 32 from the suction pipe 32 b and circulates.

  As a result, by operating each hydraulic control unit 17 by operating levers and switches provided on the driver's cab and remote controller of the pile driving machine 11, the traveling of the pile driving machine 11 and the upper turning body can be It is possible to perform turning and pile driving work. Therefore, after the turning state of the upper swinging body and the state of the auger are made ready for traveling, the pile driving machine 11 can be driven by operating the traveling means of the lower traveling body, and it is stored in a safe place. Can be made.

  The second emergency escape device 51 shown in FIG. 2 is a device in which a hydraulic circuit for emergency escape is added based on a pile driver smaller than the pile driver 11. That is, like the normal pile driver, the hydraulic circuit 52 of the second emergency escape device 51 includes a plurality of hydraulic pumps 54 driven by the engine 53, traveling means and swiveling means for the lower traveling body, and auger lifting and lowering means. , A plurality of hydraulic motors 55 provided in the auger rotating means, the winch, etc., a plurality of hydraulic cylinders 56 provided in the leader raising / lowering means, tilting means, jack means, chuck means, etc., and hydraulic oil for these devices It has a hydraulic control unit 57 comprising a plurality of various valves such as control valves and solenoid valves for controlling the flow, a hydraulic oil tank 58 for storing hydraulic oil, and hydraulic piping for connecting these various devices. When not used as an emergency escape device, each hydraulic control unit 57 is operated by an operating lever or switch provided on the cab or the like. The Rukoto, traveling, turning of the upper frame, and is formed to allow a like Kuida work. In FIG. 2, equipment that is not related to emergency escape, such as a leader cylinder, is not shown.

  The emergency escape hydraulic circuit in the emergency escape device 51 is used for pile driving work, but is not used for emergency escape, for example, a hydraulic circuit connected to the hydraulic motor 55 of the auger rotating means or auger lifting means. The circuit is used as a hydraulic oil supply circuit 61 for supplying hydraulic oil for escaping the pile driving machine 11 and a hydraulic oil return circuit 62 for returning the hydraulic oil used by the pile driving machine 11 to the hydraulic oil tank 58. At the same time, the circuit of the winch hydraulic motor is used as the hydraulic oil supply circuit 63 for supplying the pilot hydraulic oil for the pile driving machine 11, and one of the auger lifting hydraulic motor circuits is used to operate the pilot hydraulic oil after use. A hydraulic oil return circuit 64 for returning to the oil tank 58 is used. A self-seal coupling 65 is provided at the tip of each circuit as described above.

  When the pile driver 11 is escaped using the emergency escape device 51, the return direction switching valve 24 in the pile driver 11 is switched from the direction of the hydraulic oil tank 18 to the direction of the return pipe connection circuit 23, and the on-off valve 24a. Are connected to each other by a hydraulic hose 41 between the predetermined self-sealing couplings in a state of switching to the closed state.

  As a result, the hydraulic oil of a predetermined pressure sucked from the hydraulic oil tank 58 of the emergency escape device 51 and discharged from the hydraulic pump 54 passes through the hydraulic oil supply circuit 61 that passes through the auger rotating means, the auger lifting means, and the winch hydraulic motor 55. , 63, through the hydraulic hose 41, and supplied to the supply piping connection circuit 21 of the pile driving machine 11. The hydraulic oil supplied to the supply pipe connection circuit 21 of the pile driver 11 is supplied to various devices from each hydraulic pressure control unit 17 in the same manner as described above, and after use, the hydraulic oil passing through the hydraulic oil return pipe 19 is returned to the return pipe. The return direction switching valve 24 switched to the connection circuit 23 side passes through the return pipe connection circuit 23, the hydraulic hose 41, the hydraulic oil return circuit 62, and flows through the return side circuit 62 a of the hydraulic motor 55 and the hydraulic control unit 57. Return to the oil tank 58. The pilot hydraulic fluid passing through the hydraulic fluid return pipe 19a passes through the return pipe connection circuit 23, the hydraulic hose 41, and the hydraulic fluid return circuit 64 because the on-off valve 24a is closed. The flow returns to the hydraulic oil tank 58 through the return side circuit 62 b of 55.

  Thus, similarly to the above, by operating each hydraulic control unit 17 with an operating lever or the like provided on the cab of the pile driving machine 11, the turning state of the upper turning body and the state of the auger are brought into a travelable state. Thereafter, by operating the traveling means of the lower traveling body, the pile driving machine 11 can be driven, and the pile driving machine 11 can be retracted to a safe retreat place.

  In this way, the pile driver 11 is configured so that even if the emergency escape device is the first emergency escape device 31 having no hydraulic oil tank as shown in FIG. Even the second emergency escape device 51 having a tank can cope with the connection location of the hydraulic hose 41 and the switching of the return direction switching valve 24 and the on-off valve 24a. Therefore, the pile driver 11 can be used regardless of the type of the emergency escape device that is on standby at the work site, and there is no need to select a pile driver having a hydraulic circuit corresponding to the type of the emergency escape device.

  In the above-described embodiment, the pile driving machine that performs the pile driving work in the railway track is exemplified as the hydraulic working machine that is escaped by using the emergency escape device, but the hydraulic working machine of the present invention is based on the engine. The present invention can be applied to various hydraulic working machines such as cranes and excavators provided with a traveling device that is operated by hydraulic oil supplied from a driven hydraulic pump via a hydraulic circuit. The work place of the hydraulic working machine is not particularly limited, and can be applied to various hydraulic working machines that work in places where cranes cannot be used, such as under overhead lines, under bridges, and in tunnels.

  In addition, by using a self-seal coupling at the hydraulic hose connection, the hydraulic circuit can be opened and closed automatically by attaching and detaching the hydraulic hose, and operability can be improved. The hydraulic circuit can also be opened and closed.

DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Hydraulic circuit, 13 ... Engine, 14 ... Hydraulic pump, 14a ... Discharge piping, 15 ... Hydraulic motor, 16 ... Hydraulic cylinder, 17 ... Hydraulic control part, 18 ... Hydraulic oil tank, 19, 19a ... hydraulic oil return pipe, 21 ... supply pipe connection circuit, 21a ... branch point, 22 ... check valve, 23 ... return pipe connection circuit, 23a ... branch point, 24 ... return direction switching valve, 24a ... on-off valve, 25 ... operation Oil suction connection circuit, 26 ... self-sealing coupling, 31 ... first emergency escape device, 32 ... hydraulic pump for escape, 32a ... discharge pipe, 32b ... suction pipe, 33 ... engine, 34 ... self-sealing coupling, 41 DESCRIPTION OF SYMBOLS ... Hydraulic hose, 51 ... Second emergency escape device, 52 ... Hydraulic circuit, 53 ... Engine, 54 ... Hydraulic pump, 55 ... Hydraulic motor, 56 ... Hydraulic cylinder, 57 ... Hydraulic control unit, 8 ... hydraulic oil tank, 61 ... hydraulic oil supply circuit, 62 ... hydraulic oil return circuit, 62a, 62b ... back-side circuit, 63 ... hydraulic oil supply circuit, 64 ... hydraulic oil return circuit, 65 ... self-sealing coupling

Claims (2)

In a hydraulic working machine operated by hydraulic oil supplied from a hydraulic pump driven by an engine via a hydraulic circuit having a hydraulic control unit, the hydraulic circuit supplies hydraulic oil from the hydraulic pump to the hydraulic control unit A supply piping connection circuit branched from the discharge piping, a means provided in a piping between the branch point of the supply piping connection circuit and the hydraulic pump to restrict the flow of hydraulic oil in the direction of the hydraulic pump; A return pipe connection circuit branched from the hydraulic oil return pipe returning the hydraulic oil to the hydraulic oil tank, and the return direction of the hydraulic oil provided at the branch point of the return pipe connection circuit is connected to the hydraulic oil tank direction and the return pipe connection. A return direction switching valve for switching to the circuit direction and a hydraulic oil suction connection circuit for sucking hydraulic oil in the hydraulic oil tank,
When the hydraulic work machine breaks down, the first emergency escape device using the hydraulic oil in the hydraulic oil tank of the hydraulic work machine is used to make the hydraulic work machine emergency escape. The hydraulic oil discharged from the hydraulic pump of the emergency escape device is supplied to the hydraulic control unit via the supply piping connection circuit, and the return direction of the hydraulic oil after use is returned by the return direction switching valve. The hydraulic oil set in the pipe is returned to the hydraulic oil tank of the hydraulic work machine after use, and the hydraulic oil in the hydraulic oil tank is supplied to the hydraulic oil of the first emergency escape device via the hydraulic oil suction connection circuit. Set to inhale with a pump,
When the hydraulic work machine is in trouble, the second emergency escape device using the hydraulic oil in the hydraulic oil tank of the second emergency escape device is used to make an emergency escape using the second emergency escape device. The hydraulic oil discharged from the hydraulic pump of the emergency escape device 2 is supplied to the hydraulic control unit via the supply pipe connection circuit, and the return direction of the used hydraulic oil is connected to the return pipe by the return direction switching valve. The hydraulic oil after use is returned to the hydraulic oil tank of the second emergency escape device through the hydraulic oil return pipe, and the hydraulic oil in the hydraulic oil tank is connected to the hydraulic oil suction connection circuit. Via a hydraulic pump of the second emergency escape device.   The supply pipe connection circuit, the return pipe connection circuit, and the hydraulic oil suction connection circuit each include a self-seal coupling at a connection portion with a hydraulic hose for connecting to the hydraulic circuit of the emergency escape device. The hydraulic working machine according to claim 1, characterized in that:

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