JP5545998B2 - Hydraulic work machine and output increasing method - Google Patents

Description

  The present invention relates to a hydraulic working machine and an output increasing method, and more particularly to a hydraulic working machine including a working machine that is operated by hydraulic oil supplied from a hydraulic pump and an output increasing method of the hydraulic working machine.

  For example, in the ground improvement work, a ground improvement machine or a pile driving machine having a capacity corresponding to the ground condition investigated in advance is used. The ground improvement machine attaches a drilling head having a drilling blade and a stirring blade to the tip of the hollow rod, lowers the rotary drive device that rotationally drives the hollow rod, and passes through the hollow rod to the grounding agent such as cement milk to the drilling head. The ground is improved by stirring and mixing the earth and sand excavated with the excavating blade and the ground improving agent with a stirring blade. As such a ground improvement machine, excavation heads are used properly for soft ground and hard ground (see, for example, Patent Document 1).

JP 2007-279883 A

  The ground improvement machine described in Patent Document 1 can perform good ground improvement by sufficiently mixing and mixing earth and sand and ground improvement agent in both soft ground and hard ground. In the case of hard ground that differs greatly, for example, where there is unexpected rolling stones, the excavation head may not be able to rotate due to insufficient output of the rotation drive device, and in order to improve the ground to a predetermined depth It was necessary to replace the used ground improvement machine with a high output ground improvement machine.

  However, replacement of the ground improvement machine requires a great deal of labor and expense, and may cause cost cracking. In addition, using a high-power ground improvement machine from the beginning also increases the transportation cost and operation cost of the ground improvement machine. Furthermore, high-power large ground improvement machines may not be used in confined areas and places with height restrictions. Also, when performing work such as embedding steel pipes with a pile driver, if there is an unexpectedly hard ground, the work cannot be continued in the same manner as described above, and the pile driver in use is large and has a high output. Had to be replaced with a pile driver.

  Accordingly, an object of the present invention is to provide a hydraulic working machine and an output increasing method capable of easily increasing the output when the output for driving the hydraulic working machine is temporarily insufficient.

In order to achieve the above object, a hydraulic working machine according to the present invention includes a hydraulic working machine that is operated by hydraulic fluid 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 discharge side pipe that supplies hydraulic oil from the hydraulic pump to the hydraulic control unit, and an intake that causes the hydraulic pump to suck the hydraulic oil returned to the tank from the hydraulic control unit A side pipe and a circuit used to increase the output of the hydraulic work machine provided in the discharge side pipe and the suction side pipe, and the circuit for increasing the output of the discharge side pipe. A supply pipe connection circuit branched from between the hydraulic pump and the hydraulic control unit, and a supply flow path switching valve provided between the branch point of the supply pipe connection circuit of the discharge side pipe and the hydraulic control unit and, Serial and a while whether we branched return pipe connection circuit between the tank on the suction side pipe and the hydraulic pump, the tip of the supply pipe connection circuit, a means for regulating the flow of hydraulic fluid of the supply pipe connection circuit Through which a hydraulic hose is connected to a supply piping connection circuit of another hydraulic work machine, and the flow of hydraulic oil in the return piping connection circuit is regulated at the tip of the return piping connection circuit A hose connection part for connecting a hydraulic hose to the return pipe connection circuit of the another hydraulic work machine via the means is provided .

  Also, the output increasing method in the hydraulic working machine according to the present invention is a method of increasing the output of one hydraulic working machine by using two hydraulic working machines, and a supply piping connection circuit of one hydraulic working machine Is connected to the supply piping connection circuit of the other hydraulic working machine via a hydraulic hose, the flow restriction by the means for restricting the flow of hydraulic oil in each connection circuit is released, and the supply flow of the other hydraulic working machine is The flow direction of the hydraulic oil discharged from the hydraulic pump is switched from the hydraulic control unit direction to the supply piping connection circuit by operating the path switching valve, and the hydraulic oil discharged from the hydraulic pump of one hydraulic working machine and the other hydraulic pressure The hydraulic oil discharged from the hydraulic pump of the working machine and joined to the hydraulic pipe supplied from the supply piping connection circuit of the other hydraulic working machine to the supply piping connection circuit of one hydraulic working machine via the hydraulic hose joined together. hydraulic oil The hydraulic control unit of one hydraulic working machine is supplied to the working machine of the one hydraulic working machine to increase the output of the working machine, in particular, the hydraulic working machine is a ground improvement machine, and the output The work machine that increases the pressure is a hydraulic motor that drives the rotary excavator.

  According to the present invention, when the output for driving the work machine is temporarily insufficient and the work cannot be continued, the hydraulic fluid from the hydraulic circuit of the other hydraulic work machine is transferred to the hydraulic circuit of the hydraulic work machine that is working. The hydraulic oil supplied to the work machine can be increased and the output of the hydraulic working machine during work can be increased.

1 is a hydraulic circuit diagram showing an example of an 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. It is a hydraulic circuit diagram which shows an example of a circuit structure at the time of making the output of one hydraulic working machine increase with the other hydraulic working machine.

  The hydraulic working machine that is the subject of the present invention is a pile driving machine (ground improvement machine) 11 as shown in FIG. Note that “A” and “B” attached to the reference numerals in FIG. 2 are used for explanation of output increase 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. And a hydraulic pile driving machine 15 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.

  In the hydraulic circuit 20, in this embodiment, a discharge side pipe 26 of a hydraulic pump 21 (P1) that supplies hydraulic oil to a hydraulic motor 32 provided in a rotary drive device 31 of the pile driving machine 15, a tank A circuit used to increase the output of the hydraulic motor 32 is provided in the suction side pipe 27 from which the hydraulic pump 21 sucks the hydraulic oil from 23. This circuit for increasing output includes a supply pipe connection circuit 33 branched from the discharge side pipe 26, and a supply provided in a pipe 26a between the branch point 33a of the supply pipe connection circuit 33 and the hydraulic control unit 22. A flow path switching valve 34 and a return pipe connection circuit 36 branched from the suction side pipe 27 are provided. At the tips of the supply pipe connection circuit 33 and the return pipe connection circuit 36, the flow of hydraulic oil of each connection circuit The hose connection portion 19 is provided via the self-seal coupling 17 which is a means for regulating the above.

  The supply flow path switching valve 34 is in a steady position in the valve opening state shown in FIG. 1, and the self seal coupling 17 is closed when the hydraulic hose 18 is not connected to the hose connection portion 19. Therefore, when the supply flow path switching valve 34 is in the steady position, the hydraulic oil discharged from the hydraulic pump 21 (P1) to the discharge side pipe 26 passes through the discharge side pipe 26 and the supply flow path switching valve 34. A steel pipe or the like that is supplied to the hydraulic control unit 22 and supplied from the hydraulic control unit 22 to the hydraulic motor 32 and press-fitted into the ground is rotated. The return oil from the hydraulic motor 32 returns to the tank 23 from the hydraulic control unit 22 through the return pipe 28, and is sucked into the hydraulic pumps 21 from the tank 23 through the suction side pipes 27 and circulates. At this time, part of the hydraulic oil is cooled by circulating through the oil cooler 24 by the circulation pump 25.

  The pile driver 11 formed in this way is prepared by preparing two or more hydraulic work machines having the same output increasing circuit, for example, two pile drivers of the same type. When an output shortage occurs in the hydraulic equipment of the machine, in this embodiment, the output of the pile driver in operation can be increased by using another pile driver for support. Hereinafter, the hydraulic circuit of the pile driving machine in which output shortage occurred during the operation will be described with “A” attached to each symbol, and the hydraulic circuit of the pile driver used for support will be attached with “B” added to each symbol. To do.

  That is, as shown in FIG.2 and FIG.3, when the output of the hydraulic motor 32A is insufficient in the pile driver 11A in operation, the other pile driver 11B is used for support and both pile drivers 11A are used. , 11B supply and return hose connections 19A, 19B are connected to each other by a hydraulic hose 18, and the self seal coupling 17 is opened to supply piping connection circuits 33A of both pile driving machines 11A, 11B, 33B and the return pipe connection circuits 36A and 36B are made to communicate with each other, and the supply flow path switching valve 34B in the hydraulic circuit 20B of the support pile driving machine 11B is switched to the closed state.

  In this state, when the hydraulic circuits 20A and 20B of the pile driving machine 11A and the pile driving machine 11B are operated, the hydraulic oil discharged from the hydraulic pump 21B (PT1) closes the supply flow path switching valve 34B and self-seals. Since the coupling 17 is open, the pile controller in which output shortage has occurred through the hydraulic hose 18 from the supply piping connection circuit 33B without being supplied from the hydraulic controller 22B to the hydraulic motor 32B of the pile driver 11B. Supplied to the supply piping connection circuit 33A in the 11A hydraulic circuit 20A. As a result, the hydraulic oil discharged from the hydraulic pump 21A (PT1) of the pile driving machine 11A and the hydraulic oil discharged from the hydraulic pump 21B (PT1) of the pile driving machine 11B merge and the hydraulic pressure of the pile driving machine 11A. It will be in the state supplied to the motor 32A.

  As a result, the hydraulic oil discharged from the hydraulic pump 21A (PT1) and the hydraulic pump 21B (PT1) respectively joins the hydraulic motor 32A and is supplied with, for example, twice the amount of hydraulic oil. The motor 32A can be rotated at a high speed. In particular, as shown in the present embodiment, in the case where the hydraulic pump 21A (PT1) and the hydraulic pump 21B (PT1) are variable displacement pumps and have a horsepower control, the discharge flow rate decreases at high pressure, so two By supplying the hydraulic oil discharged from the hydraulic pump 21A (PT1) and the hydraulic pump 21B (PT1) in a combined manner, a decrease in the discharge flow rate at the time of high pressure is suppressed and high pressure and high flow rate hydraulic oil is supplied to the hydraulic motor 32A. Since it can be supplied, the steel pipe and the excavation head can be rotationally driven with high torque and high rotation by the hydraulic motor 32A. Therefore, even when unexpectedly hard ground exists, the work of the pile driving machine 11A is continued by keeping the working pile driving machine 11A as it is and using the other pile driving machine 11B for support. Therefore, it is not necessary to replace the pile driver with a large and high output, and the working time can be greatly reduced and the cost can be reduced as compared with the case of replacing the pile driver.

  On the other hand, part of the return oil that has returned to the tank 23A of the hydraulic circuit 20A through the return pipe 28A after driving the hydraulic motor 32A is returned from the suction side pipe 27A by the suction force of the hydraulic pump 21B (PT1). The flow is diverted to the connection circuit 36A, and is sucked from the return pipe connection circuit 36B of the hydraulic circuit 20B through the hydraulic hose 18 to the hydraulic pump 21B (PT1) through the suction side pipe 27B. At this time, the hydraulic pump 21B (PT1) sucks the hydraulic oil from the tank 23B of the hydraulic circuit 20B and the amount of oil in the tank 23B may decrease, so as shown in FIG. It is preferable to provide a return pipe 38 provided with a return pump 37 between them to return a part of the hydraulic oil in the tank 23A to the tank 23B. Further, a sensor for detecting the amount of oil in the tank 23A or the tank 23B is provided, and when the amount of oil in the tank 23A detected by the sensor exceeds the set amount, or the amount of oil in the tank 23B is It is also possible to form the return pump 37 so as to operate when it becomes less than the set amount.

  Further, the other pile driving machine 11B used for support keeps the supply flow path switching valve 34B open without connecting the hydraulic hose 18 to the hose connection portion 19B except when used for support. Because it can be used as a normal pile driver, pile driving work and ground improvement work can be performed in parallel with two pile driving machines, improving construction efficiency and shortening the construction period. be able to. In particular, when two or more of the same pile driving machines are used for construction, any pile driving machine can quickly cope with any output shortage. In addition, by using two small pile drivers in advance and using one as a working machine and the other as support, in a confined area where there is no large high output pile driver or where there is a height restriction Work is also possible.

  In a normal hydraulic circuit, a relief valve for protecting the hydraulic motor is provided on the high-pressure side in advance, so that even if high-pressure hydraulic oil is supplied to the hydraulic motor, the hydraulic valve is protected by the relief valve. In addition, by using a control valve that can control the flow rate as the hydraulic control unit, it is possible to prevent the hydraulic motor from over-rotating, so that the performance of the hydraulic motor can be maximized. Become.

  Moreover, in the said example, the pile driver of the same type was illustrated as two hydraulic working machines, However, The two hydraulic working machines do not need to be the same, an engine, a hydraulic pump, a 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. Further, the number of pumps and the number of hydraulic control units are arbitrary, and a check valve and a self-sealing coupling can be used as a normal on-off valve, and each switching valve may be a manual valve or an electromagnetic valve. Furthermore, the output of other hydraulic motors and hydraulic cylinders can be increased.

  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, 27 ... suction side piping, 28 ... Return pipe, 31 ... Rotation drive device, 32 ... Hydraulic motor, 33 ... Supply pipe connection circuit, 33a ... Branch point, 34 ... Supply flow path switching valve, 36 ... Return pipe connection circuit, 37 ... Return pump, 38 ... Return pipe

Claims (3)

In a hydraulic working machine including a hydraulic working machine that is 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 a discharge-side pipe that supplies hydraulic oil from the hydraulic pump to the hydraulic control unit, a suction-side pipe that causes the hydraulic pump to suck the hydraulic oil returned to the tank from the hydraulic control unit, and the discharge A circuit used for increasing the output of the hydraulic work machine provided in the side pipe and the suction side pipe,
The output increasing circuit includes a supply pipe connection circuit branched from between the hydraulic pump of the discharge side pipe and the hydraulic control unit, a branch point of the supply pipe connection circuit of the discharge side pipe, and the hydraulic control. It includes a supply flow path switching valve provided between the parts, and between or we branched return pipe connection circuit between said hydraulic pump and said tank of said inlet-side pipe,
A hose connection portion for connecting a hydraulic hose to a supply piping connection circuit of another hydraulic work machine is provided at the tip of the supply piping connection circuit via means for regulating the flow of hydraulic oil in the supply piping connection circuit. And a hose connection for connecting a hydraulic hose to the return pipe connection circuit of the other hydraulic work machine via a means for restricting the flow of hydraulic oil in the return pipe connection circuit at the tip of the return pipe connection circuit A hydraulic working machine characterized in that a section is provided .   A method for increasing the output of one hydraulic work machine using two hydraulic work machines according to claim 1, wherein the supply pipe connection circuit of one hydraulic work machine and the supply pipe connection circuit of the other hydraulic work machine Are connected via a hydraulic hose to release the flow restriction by the means for restricting the flow of hydraulic oil in each connection circuit, and the other hydraulic working machine operates the supply flow path switching valve to discharge from the hydraulic pump. The flow direction of the hydraulic fluid is switched from the direction of the hydraulic control unit to the supply piping connection circuit, and the hydraulic oil discharged from the hydraulic pump of one hydraulic working machine and the hydraulic pump of the other hydraulic working machine are discharged to the other The hydraulic oil supplied from the supply pipe connection circuit of the hydraulic work machine to the supply pipe connection circuit of one hydraulic work machine via the hydraulic hose is joined, and the combined hydraulic oil is hydraulically controlled by one hydraulic work machine The one from the part The output method of increasing the hydraulic working machine, characterized in that to increase the output of the working machine is supplied to the working machine hydraulic working machine.   3. The method of increasing output of a hydraulic working machine according to claim 2, wherein the hydraulic working machine is a ground improvement machine, and the working machine for increasing the output is a hydraulic motor for driving a rotary excavator.

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