JP2012067454A - Hydraulic working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic working machine having a hydraulic circuit that can be used for emergency escape of other machines with hydraulic working equipment mounted on the hydraulic working machine and enables emergency escape of the own machine by hydraulic pressure supply from other machines.SOLUTION: In a hydraulic working machine having a hydraulic circuit 20 for operating a traveling device and working equipment, the hydraulic circuit is provided with a supply pipe connecting circuit 31 branched from between a hydraulic pump 21 and a hydraulic control unit 22, a supply channel selector valve 32 installed between the supply pipe connecting circuit and the hydraulic control unit, a check valve 33 installed in the piping between a branch point of the supply pipe connecting circuit and the hydraulic pump, a return pipe connecting circuit 34 branched from between a tank 23 and the hydraulic pump 21, a return channel selector valve 35 installed between the return pipe connecting circuit and the hydraulic pump, and a hose connection part 19 for connecting a hydraulic hose to the supply pipe connecting circuit and the return pipe connecting circuit through a self seal coupling 17.

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 In the event that the hydraulic work machine cannot be withdrawn from the railway track, the emergency work device for operating the hydraulic work machine from the outside and causing the hydraulic work machine to escape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 Document 1).

JP 2010-180537 A

  The emergency escape device described in Patent Document 1 only needs to replace the hydraulic working machine of a hydraulic working machine such as a pile driver with a hydraulic oil supply device in a state where a hydraulic hose is wound around a hose reel, Although there is an advantage that various hydraulic work machines can be used for emergency escape, it has only a function as an emergency escape equipment when the hydraulic oil supply device is installed, so a hydraulic work machine using a hydraulic work machine The original work could not be performed, and when it was used as an emergency escape device, it had to wait at a predetermined place.

  Therefore, the present invention can be used as an emergency escape device that allows an emergency escape of another machine while the hydraulic work machine is mounted, and when the self machine cannot run on its own, the hydraulic pressure is supplied from the other machine. An object of the present invention is to provide a hydraulic working machine having a hydraulic circuit capable of emergency escape.

  In order to achieve the above object, the first configuration of the hydraulic working machine according to the present invention includes a traveling device that is operated by hydraulic oil supplied from a hydraulic pump driven by an engine via a hydraulic circuit having a hydraulic control unit, and In the hydraulic working machine including a work machine, the hydraulic circuit includes a supply pipe connection circuit branched from a pipe between the hydraulic pump and the hydraulic control unit, a branch point of the supply pipe connection circuit, and the hydraulic control. A supply flow path switching valve provided in a pipe between the hydraulic pipe and the branch line between the supply pipe connection circuit and the hydraulic pump to restrict the flow of hydraulic oil toward the hydraulic pump. Means, a return pipe connection circuit branched from a pipe between the tank and the hydraulic pump, a return flow path switching valve provided between the branch point of the return pipe connection circuit and the hydraulic pump, and the supply Piping connection It is characterized in that it comprises a means for regulating the flow of hydraulic fluid in each connection circuit provided on each of the circuit and return pipe connection circuit.

  The second configuration of the hydraulic working machine of the present invention includes a traveling device and a work machine that are operated by hydraulic oil supplied from a hydraulic pump driven by an engine via a hydraulic circuit having a hydraulic control unit. In the hydraulic working machine, the hydraulic circuit includes a supply pipe connection circuit branched from a pipe between the hydraulic pump and the hydraulic control unit, and a branch point between the supply pipe connection circuit and the hydraulic control unit. A supply flow path switching valve provided in the pipe, a means provided in the pipe between the branch point of the supply pipe connection circuit and the hydraulic pump, for regulating the flow of hydraulic oil in the direction of the hydraulic pump, to the tank A return pipe connection circuit branched from the return pipe, a return flow path switching valve provided between the branch point of the return pipe connection circuit and the tank, and the supply pipe connection circuit and the return pipe connection circuit. It is characterized in that its dependent and means for regulating the flow of hydraulic fluid of the connection circuit.

  According to the hydraulic work machine of the present invention, the supply pipe connection circuit and the return pipe connection circuit of the hydraulic work machine in which an abnormality has occurred in the engine or the hydraulic pump, the supply pipe connection circuit of the hydraulic work machine in a normal state, and By connecting the return pipe connection circuit via a hydraulic hose and switching the supply flow path switching valve and the return flow path switching valve, the hydraulic work machine in a normal state is connected to the hydraulic circuit of the hydraulic work machine in which an abnormality has occurred. Since the hydraulic oil can be supplied from the hydraulic circuit, the hydraulic working machine in which an abnormality has occurred can be caused to travel and escape from the work place to the evacuation place.

1 is a hydraulic circuit diagram illustrating a first embodiment of a hydraulic working machine according to the present invention. It is explanatory drawing which shows the state which connected the two hydraulic working machines via the hydraulic hose. FIG. 3 is a hydraulic circuit diagram illustrating an example of a circuit configuration when an emergency occurrence hydraulic work machine is urgently escaped by a normal state hydraulic work machine. It is a hydraulic circuit diagram which shows the 2nd form example of the hydraulic working machine of this invention.

  The hydraulic working machine which is the object of the present invention is a pile driving machine 11 as shown in FIG. 2, for example. Note that “A” and “B” attached to the reference numerals in FIG. 2 are used for explanation of emergency escape described later, and “A” and “B” are omitted in the common explanation.

  The pile driving machine 11 shown in the present embodiment includes a lower traveling body 13 provided with a crawler 12, an upper revolving body 14 that is turnable on the lower traveling body 13, and a front portion of the upper revolving body 14. The pile driving machine 15 provided is provided. An engine, a hydraulic pump, a hydraulic circuit, a fuel tank, and the like are accommodated inside the upper swing body 14, and a cab 16 is provided on the upper swing body 14. Further, a hose connection part 19 for connecting a hydraulic hose 18 via a self-seal coupling 17 is provided at the rear part of the upper swing body 14.

  As shown in FIG. 1, the hydraulic circuit 20 of the pile driver 11 includes a plurality of hydraulic pumps 21 driven by an engine (not shown), a hydraulic motor provided in a crawler 12, a pile driving machine 15, and the like. A plurality of hydraulic control units 22 having control valves and electromagnetic valves for controlling hydraulic oil supplied to various hydraulic devices such as cylinders, a tank 23 for storing return oil from each hydraulic control unit 22, and oil The cooler 24 and the circulation pump 25 and pipes for connecting them are provided. By operating each hydraulic control unit 22 by operating an operation lever or the like provided on the cab 16, The upper turning body 14 is turned, and the pile driving work 15 is performed so that the pile driving work 15 can be performed.

  Further, the hydraulic circuit 20 includes a supply pipe connection circuit 31 branched from a discharge side pipe 26 between the hydraulic pump 21 and the hydraulic control unit 22 as an emergency escape circuit, and a supply pipe connection circuit 31. The supply flow path switching valve 32 provided in the pipe 26a between the branch point 31a and the hydraulic control unit 22, and the pipe 26b between the branch point 31a and the hydraulic pump 21 are provided in the direction of the hydraulic pump 21. A check valve 33, which is a means for regulating the flow of hydraulic oil to the tank, a return pipe connection circuit 34 branched from the suction side pipe 27 between the tank 23 and the hydraulic pump 21, and the return pipe connection circuit 34 A return flow path switching valve 35 provided between the branch point 34a and the tank 23 is provided, and hydraulic oil of each connection circuit is provided at the tip of each supply pipe connection circuit 31 and the return pipe connection circuit 34. The hose connection portion 19 through the self-sealing coupling 17 is a means for regulating the flow are provided.

  The supply flow path switching valve 32 and the return flow path switching valve 35 are self-sealing couplings when the valve open state shown in FIG. 1 is in the steady position and the hydraulic hose 18 is not connected to the hose connection portion 19. 17 is all closed. When the supply flow path switching valve 32 and the return flow path switching valve 35 are in the steady positions, the pile driving machine 11 is in a state of performing the pile driving work alone, and the hydraulic oil discharged from each hydraulic pump 21 to the discharge side pipe 26. Since the front end of the supply pipe connection circuit 31 is blocked by the self-seal coupling 17, it does not flow through the supply pipe connection circuit 31, but passes through the check valve 33 and the supply flow path switching valve 32 of each discharge side pipe 26. Are supplied to the hydraulic control unit 22 and supplied from the hydraulic control units 22 to various hydraulic devices.

  The return oil from the hydraulic equipment returns from each hydraulic control unit 22 to the tank 23 via the return pipe 28 and the return pipe connection circuit 34 is closed, so that the suction side pipe 27 and the return flow path switching valve from the tank 23 are closed. It is sucked into the hydraulic pump 21 through 35 and circulated. Some hydraulic oil is circulated through the oil cooler 24 by the circulation pump 25 and cooled.

  The pile driver 11 thus formed is a single pile driver by preparing two or more hydraulic working machines having a similar emergency escape circuit, for example, two pile drivers of the same type. When an abnormality occurs in the engine or the hydraulic pump, the pile driver in which the abnormality has occurred can be escaped from the work place to the retreat place using another pile driver. Hereinafter, the hydraulic circuit of the pile driver in which an abnormality has occurred will be described with “A” added to each symbol, and the hydraulic circuit of a normal pile driver added with “B” added to each symbol.

  That is, as shown in FIGS. 2 and 3, when the hydraulic pump 21A marked with a cross in FIG. 3 becomes inoperable and an abnormality occurs in one pile driving machine 11A, another normal pile driving operation is performed. The machine 11B is used as an emergency escape device, the corresponding hose connection portions 19A, 19B of both pile driving machines 11A, 11B are connected by a hydraulic hose 18, the self seal coupling 17 is opened, and both pile driving machines 11A are connected. 11B, the supply pipe connection circuits 31A and 31B and the return pipe connection circuits 34A and 34B communicate with each other, and the supply flow path switching valve 32B and the return flow path switching in the hydraulic circuit 20B of the normal pile driver 11B. The valve 35B is switched to the closed state.

  When the hydraulic circuit 20B of the pile driving machine 11B is operated in this state, the hydraulic oil discharged from each hydraulic pump 21B has the supply flow path switching valve 32B closed and the self-seal coupling 17 opened. After passing through the check valve 33B of the discharge side piping 26B, it flows into the supply piping connection circuit 31B, and is supplied to the supply piping connection circuit 31A in the hydraulic circuit 20A of the pile driver 11A in which an abnormality has occurred through the hydraulic hose 18. At this time, since the flow of each hydraulic pump 21A is regulated by the check valve 33A, the hydraulic oil supplied from the supply piping connection circuit 31A is supplied to the hydraulic control unit 22A through the supply flow path switching valve 32A. It becomes a state to be.

  Furthermore, since the return flow path switching valve 35B provided in the suction side pipe 27B from the tank 23B in the hydraulic circuit 20B of the normal pile driving machine 11B is closed, the suction input of each hydraulic pump 21B is the return pipe. Each hydraulic pump 21B is brought into a state of acting on the tank 23A of the pile driver 11A in which an abnormality has occurred via the connection circuit 34B, the hydraulic hose 18, the return pipe connection circuit 34A, the return flow path switching valve 35A, and the suction side pipe 27A. Will suck hydraulic oil from the tank 23A.

  Therefore, when each hydraulic pump 21B of the normal pile driving machine 11B is operated in this state, the pressurized hydraulic oil is supplied to the hydraulic circuit 20A of the pile driving machine 11A where the abnormality has occurred, so By operating the hydraulic control unit 22A of the machine 11A, the lower traveling body 13A, the upper turning body 14A, and the pile driving machine 15A of the pile driving machine 11A can be operated in the same manner as normal.

  Further, the supply flow path switching valve 32A and the return flow path switching valve 35A in the hydraulic circuit 20A of the pile driving machine 11A in which an abnormality has occurred are switched to the closed state, and the supply flow path in the hydraulic circuit 20B of the normal pile driving machine 11B. By switching the switching valve 32B and the return flow path switching valve 35B to the open state, the hydraulic circuit 20B of the pile driving machine 11B can be brought into the same state as the normal state, and the pile driving machine 11B can be run. Furthermore, in the case of pile drivers of the same type and the same series, the same hydraulic circuit and the same connection port are used by switching valves regardless of whether the pile driver is normal or abnormal. Therefore, it is not necessary to change the configuration of the apparatus significantly, and various operations can be performed in the same manner, which is extremely rational.

  Thus, by using the normal pile driving machine 11B as an emergency escape device, the pile driving machine 11A in which an abnormality has occurred can be made to travel after the work in progress is completed. The pile driver 11 </ b> A can travel from the work place to a predetermined evacuation place to escape. Further, the pile driving machine 11B used as an emergency escape device keeps the supply flow path switching valve 32B and the return flow path switching valve 35B open without connecting the hydraulic hose 18 to the hose connection portion 19B. Since it can be used as a normal pile driver, it is possible to perform pile driving work at two places simultaneously with the pile driver 11A before the occurrence of an abnormality, compared to the case where a dedicated emergency escape device is kept on standby. Efficiency is improved and the construction period can be shortened. Furthermore, when performing construction that does not require emergency evacuation, each pile driver can be used as it is at different construction sites, and a separate emergency evacuation device can be prepared, or work machines can be used for emergency evacuation. The pile driver can be used more efficiently than those to be replaced.

  FIG. 4 shows a second embodiment of the hydraulic circuit provided in the hydraulic working machine. In the following description, the same components as those in the hydraulic circuit of the hydraulic working machine shown in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, the hydraulic circuit shown in the present embodiment is replaced with the tank 23 instead of branching the return pipe connecting circuit 34 from the suction side pipe 27 between the tank 23 and the hydraulic pump 21. The return pipe connection circuit 51 is branched from the return pipe 28, and a return flow path switching valve 52 is provided between the branch point 51 a of the return pipe connection circuit 51 and the tank 23. In this embodiment, the oil cooler 24 is disposed between the return flow path switching valve 52 and the tank 23.

  In this embodiment, when the pile driver 11A in which an abnormality has occurred is urgently escaped by the pile driver 11B in a normal state, the hose connection portion 19A of the pile driver 11A in which an abnormality has occurred and the pile driver 11B in a normal state. The hose connection portion 19B is connected with the hydraulic hose 18, and each supply flow path switching valve 32B of the pile driving machine 11B is switched to the closed state, and the return flow path switching valve 52A of the pile driving machine 11A is closed. Switch. Accordingly, the hydraulic oil discharged from each hydraulic pump 21B of the pile driving machine 11B causes the hydraulic circuit 20A of the pile driving machine 11A in which an abnormality has occurred via the supply pipe connection circuit 31B, the hydraulic hose 18 and the supply pipe connection circuit 31A. Can be supplied to. In addition, the return oil from the hydraulic control unit 22A of the pile driving machine 11A in which an abnormality has occurred, since the return flow path switching valve 52A is closed, passes through the return pipe connection circuit 51A and the hydraulic hose 18 from the return pipe 28A. It returns to the tank 23B of the hydraulic circuit 20B through the return pipe connection circuit 51B of the pile driver 11B in a normal state, and circulates to the hydraulic pump 21B.

  Accordingly, in the present embodiment, as in the first embodiment, the hydraulic circuit 20A of the pile driving machine 11A in which an abnormality has occurred can be operated by operating the hydraulic pump 21B of the pile driving machine 11B. The pile driver 11 </ b> A can be run to escape to the evacuation place.

  In both embodiments, the pile driver of the same type is illustrated as the two hydraulic working machines, but the two hydraulic working machines do not have to be the same, and the engine, hydraulic pump, hydraulic circuit In addition to the pile driving machine, a crawler crane, a hydraulic excavator, or the like can be appropriately combined as long as the main body unit including the fuel tank and the traveling device are provided. The number of pumps and the number of hydraulic control units are arbitrary, and check valves and self-sealing couplings can be used as normal on-off valves. Each switching valve can be a manual valve or an electromagnetic valve. Can be switched in conjunction with each other.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Crawler, 13 ... Lower traveling body, 14 ... Upper turning body, 15 ... Pile driving machine, 16 ... Driver's cab, 17 ... Self-seal coupling, 18 ... Hydraulic hose, 19 ... Hose connection , 20 ... hydraulic circuit, 21 ... hydraulic pump, 22 ... hydraulic control unit, 23 ... tank, 24 ... oil cooler, 25 ... circulation pump, 26 ... discharge side piping, 26a ... piping, 26b ... piping, 27 ... suction side Piping, 28 ... Return piping, 31 ... Supply piping connection circuit, 31a ... Branch point, 32 ... Supply flow path switching valve, 33 ... Check valve, 34 ... Return piping connection circuit, 34a ... Branch point, 35 ... Return flow path switching Valve, 51 ... Return pipe connection circuit, 52 ... Return flow switching valve

Claims (2)

  In a hydraulic working machine including a traveling device and a work machine that are 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 includes the hydraulic pump, A supply pipe connection circuit branched from a pipe between the hydraulic control unit, a supply flow path switching valve provided in a pipe between the branch point of the supply pipe connection circuit and the hydraulic control unit, and the supply pipe connection Means for restricting the flow of hydraulic oil in the direction of the hydraulic pump provided in a pipe between the branch point of the circuit and the hydraulic pump, and a return pipe connection circuit branched from the pipe between the tank and the hydraulic pump A return flow path switching valve provided between the branch point of the return pipe connection circuit and the hydraulic pump, and a hydraulic fluid of each connection circuit provided in the supply pipe connection circuit and the return pipe connection circuit, respectively. Hydraulic working machine, characterized in that it comprises a means for regulating the LES.   In a hydraulic working machine including a traveling device and a work machine that are 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 includes the hydraulic pump, A supply pipe connection circuit branched from a pipe between the hydraulic control unit, a supply flow path switching valve provided in a pipe between the branch point of the supply pipe connection circuit and the hydraulic control unit, and the supply pipe connection Means for restricting the flow of hydraulic oil in the direction of the hydraulic pump provided in a pipe between the branch point of the circuit and the hydraulic pump, a return pipe connection circuit branched from the return pipe to the tank, and the return pipe connection A return flow path switching valve provided between a branch point of the circuit and the tank, and a means for regulating the flow of hydraulic fluid in each connection circuit provided in the supply pipe connection circuit and the return pipe connection circuit, respectively Hydraulic working machine, characterized in that it comprises.

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