JP2591377Y2 - Hydraulic excavator for railway specification - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a hydraulic circuit switching device for switching between track running and iron wheel running of a hydraulic excavator of a railway specification.

[0002]

2. Description of the Related Art FIG. 1 is a side view of a hydraulic excavator of a railway specification, and 1 is an upper swing body. The lower traveling body 2 includes a crawler belt 3 and an iron wheel 4. FIG. 1 shows a case in which the iron wheel 4 travels on a rail. In the case of ordinary traveling, the iron wheel 4 is raised as indicated by a two-dot chain line, and the track 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 sides, respectively. A swivel joint 7 is mounted at the center of rotation of the upper revolving unit 1, and a hydraulic device mounted on the upper revolving unit 1 is connected to a crawler traveling hydraulic motor 5 and a steel wheel traveling hydraulic motor 6 mounted on the lower traveling unit 2. 7 so that crawler belt running and iron wheel running 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 lower traveling body 2, and includes a swivel joint 7, left and right crawler traveling hydraulic motors 5a and 5b, and left and right iron wheel traveling hydraulic motors 6a. , 6b are disposed via four manual switching valves 30 and mounted on the frame of the lower traveling unit 2. Switching between crawler belt running and iron wheel running 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 showing a frame 8 of a lower traveling body.
A swivel joint 7 is mounted on the upper surface, and a block 31 provided with a hydraulic pipe is mounted on the lower surface. A pilot operation switching valve 32 that is switched by a pilot oil pressure is mounted above the block 31. The swivel joint 7, the block 31, and the block 31 and each traveling hydraulic motor are connected by piping. The pilot operation switching valve 32 is switched at the driver's seat.

[0005]

However, in the above configuration, the following problems occur. In the first example, when switching between crawler 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,
Very poor assemblability and maintainability in the frame. In the second example, switching between crawler traveling and iron wheel traveling can be performed at the driver's seat, but as in the first example, the number of pipes in the frame is large,
In the case of a small-sized hydraulic excavator with a small frame and a small hydraulic excavator, the assemblability and the maintainability are poor, and it may be impossible to mount the excavator due to insufficient space.

The present invention has been made in view of the above-mentioned problems, and it is possible to switch between crawler traveling and iron wheel traveling in a driver's seat, and furthermore, the number of pipes in a frame is small, and assembling and maintenance are easy. An object of the present invention is to provide a swivel joint-integrated switching valve that is excellent and can be mounted on a small model.

[0007]

In order to achieve the above object,
The railway-specific hydraulic excavator according to the present invention has two
Hydraulic motor alternate reciprocating drive with two pipes on each side
Circular track and two crawler tracks each paired with two pipelines
Iron having an alternating reciprocating drive circuit for the driving hydraulic motor
A pair of right and left iron wheel drive hydraulic motors for road rail traveling,
Equipped with a pair of left and right crawler drive hydraulic motors for traveling on an endless track
Hydraulic excavators of railway specifications
Attached to the same position on the left and right sides for each alternate reciprocating drive circuit
One reciprocating return drive for each iron wheel drive hydraulic motor
The circuit is assembled so that it can be selectively connected through a switching valve.
A pipeline housing with four combined pipeline switching points
And the four pipeline switching points are provided with iron wheel drive.
To the driver's seat to selectively connect the crawler drive hydraulic circuit
A switching valve device provided with a switching valve operable by
Swivel joint that connects the hydraulic circuit between the vehicle and the undercarriage
It is a configuration that is integrally attached to the

[0008]

According to the above construction, a block in which a traveling hydraulic circuit for the crawler belt and the iron wheel is installed is mounted below the swivel joint, and a switching valve operable in the driver's seat to switch between the crawler belt and the iron wheel is mounted on the block. As a result, the piping between the swivel joint, the block and the switching valve becomes unnecessary, and
When the operator operates the switching valve in the driver's seat, it is possible to switch between crawler traveling and iron wheel traveling.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 turning center of the vehicle body. A block 10 having a track running hydraulic circuit and an iron wheel running hydraulic circuit is installed below the swivel joint 7, and the lower part of the block 10 is switched by pilot hydraulic pressure. The block 10 is mounted on the frame 8 of the lower traveling unit 2.

FIG. 3 is a plan view of the block 10, and FIG.
Is a side view. On the upper surface, holes 11, 12, which are connected to the hydraulic motor circuit formed on the lower surface of the swivel joint 7,
13 and 14 are provided, and three holes 11 (a, b, and 11) respectively connected to four pilot switching valves 20 are provided on the lower surface.
c), 12 (a, b, c), 13 (a, b, c), 14
(A, b, c) are perforated. Holes 11, 12, 1
3, 14 are holes 11a, 12a, 13a, 14a, respectively.
Is in communication with Holes 11 on both sides of block 10
(D, e), 12 (d, e), 13 (d, e), 14
(D, e) are provided, and the hole 11b, the hole 11d, and the hole 11c are provided.
And 11e communicate with each other. The other 12 (b,
c) and (d, e), 13 (b, c) and (d, e), 14
(B, c) and (d, e) also communicate in a similar relationship.

FIG. 5 is an external view of the pilot operation switching valve 20, in which (a) is a side view and (b) is a bottom view. FIG.
As shown in (b), three holes 21a, 21b, and 21c are provided on the bottom surface of the pilot operation switching valve 20, and the holes 21a are formed by the operation of the operator in the driver's seat.
b or 21c.

As shown in FIG. 6, a swivel joint 7 is mounted on the upper surface of the block 10, and four pilot switching valves 20 are provided on the lower surface of the block 10 on the lower surface.
Attached to the position that fits the holes. Holes on the side surface of the block 20, 11d and 12d correspond to the right crawler running motor,
3d and 14d are left crawler running motors, 11e and 12e
Is connected to the right iron wheel traveling motor, and 13e and 14e are connected to the left iron wheel traveling motor. Therefore, the operator operates the four pilot operation switching valves 20 in the driver's seat to make the holes 21a and 21b communicate with each other, thereby opening the hole 1.
1, 12, 13, 14 and holes 11d, 12d, 13d, 1
4d communicates with the crawler track, allowing holes 21a and 2
1c, the holes 11, 12, 13, 1
4 communicates with the holes 11e, 12e, 13e, and 14e to enable iron wheel running.

[0013]

[Effect of the Invention] As described above, the present invention mounts a block in which a track traveling hydraulic circuit and an iron wheel traveling circuit are installed below a swivel joint of a hydraulic excavator of a railway specification, and a track traveling circuit on a lower surface of the block. The operator can switch between crawler traveling and iron wheel traveling at the driver's seat by installing a switching valve that can be operated at the driver's seat, which switches between the wheel driving circuit and the iron wheel traveling circuit. This eliminates the need for piping, greatly reducing the number of piping, providing good assemblability and maintainability, and providing a swivel joint-integrated switching valve that can be mounted on small models.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator of a railway specification.

FIG. 2 is a vehicle-mounted view of the 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 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 the conventional traveling hydraulic circuit.

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

[Explanation of symbols]

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

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of two conduits, one each on the left and right
Hydraulic motor alternate reciprocating drive circuit and two pipelines are paired
Alternate reciprocating drive for two crawler track driving hydraulic motors
A pair of left and right iron wheels for traveling on railroad rails having a dynamic circuit
Hydraulic motor for driving and a pair of left and right crawler tracks for traveling on an endless track
Railway-specific hydraulic power shovel with hydraulic motor for driving
In each case, each hydraulic motor alternate reciprocating drive circuit
In addition, for the iron wheel drive hydraulic motor
Selectable one reciprocating drive circuit by switching valve
There are four pipeline switching points combined to connect to
And the four conduits
Selects the drive hydraulic circuit of iron wheel drive and crawler belt drive at the switching point
With a switching valve operable at the driver's seat
Connects the valve device to the hydraulic circuit between the upper revolving unit and the lower traveling unit
Specially attached to the swivel joint
Hydraulic excavator of railway specification.