JPH078407U - Swivel joint integrated switching valve - Google Patents

Abstract

(57) [Summary] [Purpose] A railway-type hydraulic power shovel with a switching device between crawler track traveling and iron wheel traveling that can be switched in the driver's seat, has a small number of pipes, and is easy to assemble and maintain. To [Structure] A block 10 in which a crawler belt traveling hydraulic circuit and a steel wheel traveling hydraulic circuit are installed is attached to a lower portion of a swivel joint 7 at a center of rotation of an undercarriage 2, and a lower portion of the block 10 can be operated by a driver's seat. Four pilot operation switching valves 20 are attached. The block 10 is attached to the frame 8 of the undercarriage 2. The block 10 and the left and right crawler belt traveling motors and iron wheel traveling motors are connected by piping. As a result, crawler belt traveling and iron wheel traveling can be switched at the driver's seat, and piping between the center swivel 7 and the block 10 and the pilot operation switching valve 20 is not required, and the assembling and maintainability are improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a hydraulic circuit switching device for switching between crawler track traveling and iron wheel traveling of a railway-type hydraulic power shovel.

[0002]

[Prior art]

 Fig. 1 is a side view of a railway-type hydraulic power shovel, and 1 is an upper swing body. The undercarriage 2 includes a crawler belt 3 and iron wheels 4. Although Fig. 1 shows a case where the iron wheel 4 travels on the rail, in the case of ordinary running, the iron wheel 4 is lifted as shown by a chain double-dashed line and the crawler belt 3 is grounded. A crawler belt traveling hydraulic motor 5 is mounted on the crawler belt 3, and an iron wheel traveling hydraulic motor 6 is mounted on the iron wheel 4 on the left and right. A swivel joint 7 is attached to the swing center of the upper swing body 1, and the hydraulic device mounted on the upper swing body 1 and the track traveling hydraulic motor 5 and the iron wheel traveling hydraulic motor 6 mounted on the lower traveling body 2 are swivel. It is connected via a joint 7, and crawler track traveling and iron wheel traveling can be switched by a switching valve.

FIG. 7 is a configuration diagram of a first example of a traveling hydraulic pipe mounted on a conventional undercarriage 2, which includes a swivel joint 7, left and right crawler belt traveling hydraulic motors 5a and 5b, and left and right iron wheel traveling hydraulic motors. The hydraulic pipes connecting the 6a and 6b are arranged via four manual switching valves 30 and mounted on the frame of the lower traveling body 2. Switching between crawler belt traveling and iron wheel traveling is performed by the operator switching the manual switching valve 30.

FIG. 8 is a plan view of a second example of a conventional traveling hydraulic pipe, and FIG. 9 is a side sectional view. A swivel joint 7 is mounted on the upper surface of a frame 8 of a lower traveling body, and a hydraulic pipe is formed on the bottom surface. A block 31 in which is installed is attached. A pilot operation switching valve 32 that is switched by pilot oil pressure is mounted on the upper portion of the block 31. The swivel joint 7 and the block 31, and the block 31 and each traveling hydraulic motor are connected by piping. The pilot operation switching valve 32 can be switched at the driver's seat.

[0005]

[Problems to be solved by the device]

 However, the following problems occur in the above configuration. In the first example, when switching between crawler track traveling and iron wheel traveling, it is necessary for the operator to get out of the cab and switch all four switching valves. Further, as shown in FIG. 7, the number of pipes between the swivel joint and the manual switching valve is large, and the ease of assembly and maintenance in the frame is extremely poor. In the second example, switching between crawler track traveling and iron wheel traveling can be performed from the driver's seat, but as with the first example, the number of pipes in the frame is large, assembly and maintenance are poor, and the frame is small. However, small hydraulic excavators may not be installed due to lack of space.

The present invention has been made in view of the above-mentioned problems, and it is possible to switch between crawler belt running and iron wheel running in the driver's seat. Moreover, the number of pipes in the frame is small, and the assemblability and maintainability are improved. The objective is to provide a swivel joint-integrated switching valve that is good and can be mounted on small models.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in a swivel joint integrated type switching valve according to the present invention, in a railway-type hydraulic power shovel, a swivel joint below the hydraulic circuit between the upper revolving structure and the lower traveling structure is connected to the lower part of the swivel joint. The track running hydraulic circuit and the iron wheel running hydraulic circuit are installed in the block, and the block is equipped with a switching valve that can be operated in the driver's seat to switch between the track running circuit and the iron wheel running circuit. It is a feature.

[0008]

[Advantageous Effects] According to the above configuration, a block in which the traveling hydraulic circuit for the crawler belt and the iron wheel is installed is attached to the lower part of the swivel joint, and the block has a switching valve that can be switched between the crawler belt and the iron wheel in the driver's seat. Since it is installed, the piping between the swivel joint-block-switching valve is unnecessary, and the operator can switch between crawler belt traveling and iron wheel traveling by operating the switching valve.

[0009]

【Example】

 An embodiment of a swivel joint integrated switching valve according to the present invention will be described below with reference to the drawings. FIG. 2 is a cross-sectional view of the center of turning of the vehicle body. Below the swivel joint 7, a block 10 in which a track traveling hydraulic circuit and an iron wheel traveling hydraulic circuit are installed is installed, and below the block 10, pilot hydraulic pressure is applied. The pilot operation switching valve 20 that can be switched is mounted, and the block 10 is mounted on the frame 8 of the undercarriage 2.

FIG. 3 is a plan view of the block 10, and FIG. 4 is a side view. The upper surface is provided with holes 11, 12, 13, 14 for connecting to the hydraulic motor circuit formed on the lower surface of the swivel joint 7, and the lower surface is provided with three holes each for connecting four pilot switching valves 20. Holes 11 (a, b, c), 12 (a, b, c), 13 (a, b, c), 14 (a, b, c) are drilled. The holes 11, 12, 13, 14 communicate with the holes 11a, 12a, 13a, 14a, respectively. Holes 11 (d, e), 12 (d, e), 13 (d, e), 14 (d, e) are provided on both side surfaces of the block 10, and the holes 11b and 11d, the holes 11c and 11e. And are in communication with each other. The other 12 (b, c) and (d, e), 13 (b, c) and (d, e), 14 (b, c) and (d, e) are also communicated in the same relationship. There is.

FIG. 5 is an external view of the pilot operation switching valve 20, where (a) is a side view and (b) is a bottom view. As shown in FIG. 5 (b), three holes 21a, 21b, 21c are provided on the bottom surface of the pilot operation switching valve 20, and the hole 21a is changed to 21b or 21c by the operation of the operator in the driver's seat. It can be switched to communicate.

The swivel joint 7 is mounted on the upper surface of the block 10 as shown in FIG. 6, and the four pilot switching valves 20 are mounted on the lower surface at positions matching the three holes provided on the lower surface of the block 10. It is installed. Holes on the side surface of the block 20, 11d and 12d for the right track running motor, 13d and 14d for the left track running motor, 11e and 12e for the right iron wheel running motor, and 13e and 14e for the left iron wheel running motor. Connected to. Therefore, the operator operates the four pilot operation switching valves 20 in the driver's seat to connect the holes 21a and 21b to each other so that the holes 11, 12, 13, 14 and the holes 11d, 12d, 13d, 14d communicate with each other. Thus, the crawler belt can be run, and by connecting the holes 21a and 21c to each other, the holes 11, 12, 13, and 14 and the holes 11e, 12e, 13e, and 14e are connected to each other, and the iron wheel can be run.

[0013]

[Effect of device]

 As described above, the present invention installs a block in which the track running hydraulic circuit and the iron wheel running circuit are installed in the lower part of the swivel joint of the railway hydraulic excavator, and the track running circuit and the iron wheel running circuit are installed on the bottom surface of the block. The operator can switch between crawler track running and iron wheel running in the driver's seat because a switching valve that can be operated in the driver's seat is installed, and the piping between the swivel join and the block and the switching valve can be switched. Since it is no longer required, the number of pipes is greatly reduced, assembly and maintenance are good, and a swivel joint integrated switching valve that can be installed in small models is obtained.

[Brief description of drawings]

FIG. 1 is a side view of a railroad hydraulic excavator.

FIG. 2 is a vehicle body mounting view of a swivel joint integrated switching valve of the present invention.

FIG. 3 is a plan view of the block of the present invention.

FIG. 4 is a side view of the block of the present invention.

FIG. 5 is an external view of a pilot operation switching valve.

FIG. 6 is a side view of the swivel joint integrated type switching valve of the present invention.

FIG. 7 is a configuration diagram of a first example of a conventional traveling hydraulic circuit.

FIG. 8 is a plan view of a second example of a conventional traveling hydraulic circuit.

FIG. 9 is a side view of a second example of a conventional traveling hydraulic circuit.

[Explanation of symbols]

 2 Undercarriage 7 Swivel joint 8 Frame 10 Block 20 Pilot operation switching valve

Claims (1)

[Scope of utility model registration request] 1. In a railroad hydraulic excavator, a block in which a crawler track hydraulic circuit and an iron wheel traveling hydraulic circuit are installed is provided below a swivel joint that connects a hydraulic circuit of an upper revolving structure and a lower traveling structure. The swivel joint-integrated switching valve is characterized in that a switching valve that switches between the crawler belt traveling circuit and the iron wheel traveling circuit is mounted on the block and that can be operated in the driver's seat.