JPH0629216Y2 - Hydraulic circuit for running on soft ground improvement machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hydraulic circuit for traveling in a 4-float type soft ground improvement machine in which a hardener such as fresh concrete or cement is mixed into soft ground such as a landfill.

(Prior art) A soft ground improvement machine is equipped with a stirrer that mixes a soil hardening agent into soft ground while stirring, at the front of a self-propelled lower body that has a float equipped with crawler tracks. An upper car body is installed, and a driver's cab and a prime mover are mounted on the upper car body. The agitator may be a trencher having a stirrer attached to a chain rotated by a motor, or a stirring blade on a vertical rotary shaft. A vertical stirrer equipped with is attached.

Of such a soft ground improvement machine, a guide frame is attached to the front part of the lower body in a direction crossing the lower body, a traverse frame is attached movably along the guide frame, and an agitator is attached to the traverse frame. There is a structure in which the ground is agitated and the hardening agent is injected in a zigzag manner while the traverse frame is reciprocated (Japanese Patent Laid-Open No. Sho 5).
No. 8-127829), this structure has an advantage that work can be performed more efficiently than a work machine that performs work while constantly traveling. In this type of ground improvement machine, there is a lower vehicle body having a total of four floats each having two floats on the left and right sides to increase the reciprocating width of the agitator. However, with this 4-float type, if the hydraulic circuits of the left and right hydraulic motors of the two floats are connected in series, the two hydraulic motors will rotate at the same speed, so that they will travel in a curved shape on hard ground. Of the inner and outer float tracks, the inner float track will rotate too fast and the outer float track will rotate too slowly, resulting in a trailing track while dragging the outer track or float. Therefore, there is a problem that energy is wasted.

Also, if the hydraulic circuits of the left and right hydraulic motors of the two floats are connected in parallel, when working on soft ground, if the softness of the ground on which each float is mounted is slightly different, the two hydraulic motors One of them (the weaker one)
There is a problem in that it is difficult to drive because only the car rotates.

(Problems to be Solved by the Invention) The present invention has been made in view of these problems.
It is an object of the present invention to provide a traveling hydraulic circuit for a soft ground improvement machine having a configuration capable of efficiently traveling regardless of the softness of the ground.

(Means for Solving Problems) The present invention has two floats on each of the left and right sides, and a track and a traveling hydraulic motor are attached to each float to form a self-propelled lower vehicle body. In the 4 float type soft ground improvement machine in which a stirrer that mixes soil hardening agent into soft ground while stirring is installed in the front part of the machine, a common control valve is provided for each of the left and right 2 floats. And a switching device for connecting the hydraulic circuits of the traveling hydraulic motors, which are respectively provided on the secondary side of each control valve, in parallel and in series on the secondary side of the control valve. To do.

(Operation) In the present invention, when traveling on soft ground, the hydraulic circuits of the hydraulic motors of the inner and outer floats are connected in series, and the hydraulic motors of the inner and outer floats are rotated at a constant speed. When traveling on a hard ground, the hydraulic circuits of the hydraulic motors of the inner and outer floats are connected in parallel, so that the hydraulic motor rotates at a speed corresponding to the resistance received by the crawler belt during bending.

(Embodiment) FIG. 1 to FIG. 3 are a side view, a plan view and a front view, respectively, for explaining an embodiment of a soft ground improvement machine to which the present invention is applied, in these drawings, 1 is a lower body, Reference numeral 2 denotes an upper vehicle body, and lower vehicle body 1 has two floats 3A to 3D on the left and right, and a total of four floats 3A to 3D. Two front and rear lateral beams 4 fixed through these four floats 3A to 3D. Four
Main vertical beams 5 and 5 fixed to the inner beams 3B and 3C in the vicinity of the horizontal beams 4 and 4, and the main vertical beams 5 and 5.
The upper vehicle body mounting table 6 fixed between 5 and the lateral beams 4, 4
Auxiliary vertical beams 7A, 7 installed and fixed between the floats 3A and 3B and between the floats 3C and 3D, respectively.
B, auxiliary vertical beams 7C and 7D installed and fixed to both ends of the horizontal beams 4 and 4, and the floats 3A to 3D.
Of the driving wheels 20, driven wheels 21, and receiving wheels (not shown) around the float, and the crawler belts 9 which are rotationally driven by the traveling hydraulic motors 8A to 8D, respectively.

An agitator 10 is attached to the front of the lower vehicle body 1 by the following mechanism. That is, the vertical beams 5, 7
A hydraulic cylinder 1 in which a stirrer traverse guide frame 12 is mounted on brackets 11 fixed to the front portions of A to 7D, respectively, between the upper portion of the guide frame 12 and the beams 5, 7A to 7D.
The tilt angle can be adjusted with the pin 14 as the center. A transverse frame 15A is attached to the guide frame 12 via a guide roller (not shown) so as to be movable left and right, and the transverse frame 15A is moved and attached by a hydraulic motor 16 attached to the back surface of the guide frame 12. The sprocket 17 attached to the left and right end portions of the guide frame 12 and the transverse frame 15A, and the sprocket 17 are wound around the sprocket 17.
Chain 18 with both ends connected to the left and right ends of the guide frame 12.
And a drive sprocket 16a that is rotated by the hydraulic motor 16 and meshes with the chain 18. By operating the hydraulic motor 16, the traverse frame 15A can be moved left and right.

An elevating frame 15B is mounted on the traverse frame 15A so as to be vertically movable by a hydraulic cylinder 60. A supporting frame 22 of the stirrer 10 is attached to a front portion of the elevating frame 15B via an arm 23. The main body 24 of the stirrer 10 is attached by a hydraulic cylinder (not shown) so that it can be moved up and down.
Attach the drive shaft 26 rotated by the hydraulic motor 25,
A plurality of vertical frames 27 are fixed to the lower part of the main body 24.
A driven shaft 28 is rotatably attached to a lower portion of the chain, and a chain 31 is wound around sprockets 29 and 30 fitted to the drive shaft 26 and the driven shaft 28 as a pair, respectively, to form a pair of chains 31 and 31. Stirrer 3 connected between
2 are attached to the entire circumference of the chain 31 with a plurality of intervals, and by operating the hydraulic motor 25, the chain 31 rotates together with the agitator 32 to agitate the soft ground. . It is to be noted that the elevating frame 15B is mounted on the traverse frame 15A so as to be able to ascend and descend is the agitator 1
This is because the elevating height of 0 is increased to allow the long stirrer 10 to be mounted and the stirring depth to be increased.

On the other hand, the upper vehicle body 2 has the beam 5 on the lower vehicle body 1.
It is installed via the front-back position adjusting mechanism of the upper vehicle body 2 and the turning device 33 which are interposed between the vehicle body and the mounting table 6, and a driver's cab 35 is installed in front of the vehicle body frame 34 to drive the vehicle body frame 34. Behind the chamber 35, a prime mover 36, an oil tank 37, a power unit 38, and a fuel tank 39.
Is mounted, and a generator 40 and a compressor 41 are mounted as needed.

In FIG. 1, reference numeral 42 denotes a hydraulic hose 43 for feeding hydraulic oil to an actuator used in the agitator 10, a pipe for feeding fresh concrete and compressed air together with the concrete, or an electric type instead of a hydraulic actuator. A hose attachment frame that supports cables and the like without hanging when a device is used. The hose attachment frame 42 connects two frames 42A and 42B with a pin 45 rotatably at an intermediate portion. The other ends of the frames 42A and 42B are connected to the upper vehicle body 2 and the traverse frame 15A via joints 44 and 46 which are rotatable and vertically rotatable, and can move following the left and right movements of the traverse frame 15A. it can. In addition, 70 supports hoses for supplying hydraulic oil to the traverse hydraulic motor 16,
It is an excavation type support frame provided between the mounting table 6 and the beam 5 or a portion integrated with the beam 5.

In this ground improvement machine, cement is sprayed on the ground, the hydraulic motor 25 of the agitator 10 is operated, and the hydraulic motor 16 is operated in a traveling stopped state to traverse the agitator 10 in a range from a to b. When it comes to position a or b, stirrer 10
A hydraulic cylinder for lifting and lowering the body and a hydraulic cylinder 60
Operation, the machine is pulled up as shown in FIG.
The work is performed by retreating the width of 0 and lowering and operating the stirrer 10 again, and the work may be performed while pouring fresh concrete. When the vertical type is used, the same work as described above is performed while pouring fresh concrete and moving the stirrer up and down at a slower speed than the above case.

In such a ground improvement machine, the traveling hydraulic circuit for supplying hydraulic oil to the traveling hydraulic motors 8A to 8D, which is the main part of the present invention, is configured as shown in FIGS. 4 and 5, for example. It 4 and 5 show the left float 3
Regarding the hydraulic motors 8A and 8B provided in A and 3B,
Although the serial connection and the parallel connection are respectively shown, the hydraulic circuits of the hydraulic motors 8C and 8D on the right side are similarly configured.

In FIGS. 4 and 5, 47 is the power unit 3
A hydraulic pressure source including a hydraulic pump provided in 8, an oil tank 37, a control valve 48 provided in the operator's cab 35, a center joint 49 provided in the swivel device 33, 50 and 51 2 of the control valve 48 The secondary side pipelines of the book, 52A, 52B are hydraulic pipelines connected to the hydraulic oil inlet / outlet of one (outer) hydraulic motor 8A, 53A, 5A
3B is a hydraulic pipeline connected to the hydraulic oil inlet / outlet of the other (inner) hydraulic motor 8B, and the pipelines 50 and 51 are one pipeline 52A connected to the outside hydraulic motor 8A, respectively.
The pipeline 53B is connected to one of the inner hydraulic motors 8B, and the pipeline 51 is connected to the other pipeline 52A of the outer hydraulic motor 8A via an opening / closing valve 61. In addition, the other pipeline 5 connected to the inner hydraulic motor 8B
3A has a hydraulic hose 55 for connection change through a joint 54.
Is connected to the tip of the connection-changing hydraulic hose 55,
A quick joint 57 is provided, and quick joints 58 and 59 which are attached to and detached from the joint 57 are respectively provided in the pipe lines 52A and 52B connected to the outer hydraulic motor 8A.

When performing work using this ground improvement machine, when the ground is soft, as shown in FIG. 4, the quick joint 57 at the tip of the hydraulic hose 55 for connection change is connected to the outer hydraulic motor 8.
The valve 59 is connected to the joint 59 provided in the conduit 52B connected to A, and the on-off valve 61 is set to the shut-off position as shown. As a result, the pipe line 52 is provided between the hydraulic motors 8A and 8B.
B, the joints 59 and 57, the hydraulic hose 55 for connection change, and the conduit 53A are connected in series. Therefore, the internal and external hydraulic motors 8A and 8B rotate at a constant speed in forward and reverse directions by switching the control valve 48 to the right or left position, so that the floats 3A and 3B are irrespective of the resistance of the ground on which the floats 3A and 3B are mounted. The crawler belt wound around 3B rotates at a constant speed, the situation in which only one crawler belt 9 rotates due to the difference in the resistance of the ground is prevented, and the machine can be reliably driven.

On the other hand, when the ground is relatively hard, as shown in FIG. 5, the quick-connect joint 5 at the tip of the connection-changing hydraulic hose 55 is used.
7 is connected to the joint 58 provided in the conduit 52A connected to the outer hydraulic motor 8A, and the opening / closing valve 61 is switched to the communicating position. As a result, the hydraulic motors 8A and 8B are connected in parallel. Therefore, the internal and external hydraulic motors 8A, 8B
Is affected by the resistance of the ground on which the floats 3A and 3B are placed when the control valve 48 is rotated in the forward or reverse direction by switching the control valve 48 to the right or left position. For example, when turning the machine to the right, Since the resistance applied to the crawler belt 9 wound around the outer float 3A is smaller than the resistance applied to the crawler belt 9 wound around the inner float 3A, the outer hydraulic motor 8
A rotates faster than the inner hydraulic motor 8B, and the curved movement can be smoothly performed with less energy loss.

FIG. 6 shows another embodiment of the present invention. In this embodiment, the switching for selectively connecting the conduits 52A and 52B connected to the outer hydraulic motor 8A to the conduit 53A connected to the inner hydraulic motor 8B. A valve 62 is provided and the on-off valve 61 is provided.
As described above, when the switching valve 62 is set to the right position and the opening / closing valve 61 is in the communication position, the hydraulic motors 8A and 8B are in the parallel connection state, and vice versa. When the switching valve 62 is set to the left position and the opening / closing valve 61 is set to the shutoff position, the hydraulic motors 8A and 8B are connected in series.

When implementing the present invention, in FIGS. 4 and 5, the circuit switching may be performed by using a hydraulic hose having a joint instead of the opening / closing valve 61. Further, as shown in FIG. 6, when the circuit is switched by switching the valves, it is possible to use an electromagnetically operated type or hydraulically operated type in which each valve can be remotely operated.

(Effects of the Invention) As described above, according to the present invention, the common hydraulic control valve is provided for each of the two left and right floats, and two traveling hydraulic pressures are provided on the secondary side of each control valve. Since a switching device for connecting the hydraulic circuit of the motor on the secondary side of the control valve in parallel or in series is provided, when traveling on soft ground, the hydraulic circuits of the hydraulic motors of the inner and outer floats are connected in series. By connecting to, the crawler belt inside and outside can be rotated at a constant speed to ensure reliable running,
When traveling on relatively hard ground, the hydraulic circuits connected to the internal and external hydraulic motors for traveling can be connected in parallel to respond to the resistance of the track during traveling. Since the inner and outer crawler belts rotate at a speed, it is possible to efficiently and smoothly move and run without loss of output of the inner and outer hydraulic motors.

[Brief description of drawings]

1 is a side view showing an embodiment of a ground improvement machine according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, and FIG. 4 is an embodiment of a traveling hydraulic circuit according to the present invention. Is a hydraulic circuit diagram showing the parts connected in series, FIG. 5 is a hydraulic circuit diagram showing the parts connected in parallel, and FIG. 6 is a hydraulic circuit diagram showing another embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] 1. A self-propelled lower vehicle body having two floats on each of the left and right sides, a track and a hydraulic motor for traveling are attached to each float, and a soil hardening agent is provided on the front portion of the lower vehicle body. A 4-float type soft ground improvement machine in which a stirrer that mixes into soft ground while stirring is installed so that it can traverse freely. A common control valve is provided for each of the two floats on the left and right, and the secondary side of each control valve. A hydraulic circuit for traveling in a soft ground improvement machine, characterized in that it is provided with a switching device for switching the hydraulic circuits of the traveling hydraulic motors provided for each of the two in parallel and in series on the secondary side of the control valve. circuit.