JPH0550108U - Hydraulic circuit for propulsion body - Google Patents

Abstract

(57) [Summary] [Structure] The first and second oil passages 13 for supplying pressure oil to the first and second cylinder chambers 10A and 10B formed in the propelling body 3.
16 is provided. A first state in which one of them is connected to the pump P and the other is connected to the oil tank T;
A switching valve 18 is provided for switching between a second state in which both oil passages 13 and 16 are in a neutral state and a third state in which the other oil passage is connected to the pump P and one oil passage is connected to the oil tank T. There is. Both cylinder chambers 10A, 10B and switching valve 18
And a communication state in which the two cylinder chambers 10A,
First and second shut valves 19 and 20 for switching to a shut-off state for shutting off the flow from the 10B side are provided, respectively. An interlocking mechanism 21 is provided which interlocks the operation of putting one of the shut valves 19 and 20 with the shutoff state and the operation of putting the switching valve 18 in the neutral state. [Effect] It is possible to easily stop the propelling body which is being driven accurately at a predetermined position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a propelling body driving piston, which is slidable with respect to a cylinder provided in a propelling body, is provided, and first and second cylinder chambers are formed on both sides of the piston, and the first and second cylinder chambers are provided. First and second oil passages for supplying pressure oil are provided, and one of the first and second oil passages is connected to a pump and the other oil passage is connected to a drain tank. Switch to 1 state, a second state in which the first and second oil passages are in a neutral state, and a third state in which the other oil passage is connected to a pump and the one oil passage is connected to a drain tank. A switching valve is provided, and in the first and second oil passages, between the first and second cylinder chambers and the switching valve, a communication state in which they communicate with each other, and the first and second cylinders The first and second shut valves that switch to a shutoff state that shuts off the flow from the chamber side Re on the promotion-body hydraulic circuit respectively is provided.

[0002]

[Prior Art]

 Conventionally, in the above-mentioned hydraulic circuit for a propelling body, an interlocking mechanism is provided between the first shut valve and the second shut valve so that they are switched at the same time and in the same switching direction. Further, the switching valve is provided with a switching mechanism for performing the switching separately from the interlocking mechanism. Then, when stopping the propelling body during driving at a predetermined position, the interlocking mechanism is operated to switch both shut valves to the shutoff state side, and then the switching valve is switched to the neutral state to release the pressure oil from the pump. With the oil discharged to the drain tank, the flow from the first and second cylinder chambers in the first and second oil passages is shut off, and the oil is contained in the first and second cylinder chambers to move the piston. To stop the propelling body connected to the piston.

[0003]

[Problems to be solved by the device]

 However, in hydraulic circuits for propulsion units, the oil passage between the shut valve and the cylinder is generally long, and moreover, the oil passage is often formed by piping of an elastic material such as resin, so that the drive When the first and second shut valves are simultaneously switched to confine the oil in the cylinder chamber and the oil passage in an attempt to stop the inner propelling body at a predetermined position, the oil passage on the side supplying the pressure oil is While the pressure is higher than the pressure in the other oil passage, that is, the pressure is likely to be stored in the oil passage in the pressure state before switching, and as a result, the pressure in one cylinder chamber is There is a drawback that the pressure becomes higher than the pressure in the room, the piston overruns to the low pressure side due to the pressure difference, and it is difficult to accurately stop at the predetermined position. An object of the present invention is to solve the above-mentioned conventional drawbacks and to provide a hydraulic circuit for a propulsion body, which makes it easy to accurately stop the propulsion body during driving at a predetermined position.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the hydraulic circuit for a propellant according to the present invention is provided with an interlocking mechanism that interlocks the operation of putting one of the shutoff valves with the shutoff state and the operation of putting the switching valve in the neutral state. It has the following features and effects.

[0005]

[Action]

 In other words, because of the above-described configuration, when stopping the propelling body that is being driven at a predetermined position, an operation that shuts off the shut valve in the oil passage on the side where pressure oil is discharged, If the operation to put the switching valve in the neutral state is linked, the oil in the oil passage supplying the pressure oil will flow into the drain tank at the same time as the operation, and the oil in the cylinder chamber on the pressure oil supply side will It is possible to reduce the pressure and prevent the piston from moving after the operation.

[0006]

[Effect of the device]

 Therefore, it is possible to prevent the piston from moving after the shut valve and the switching valve are interlocked with each other, so that it is possible to provide a hydraulic circuit for a propulsion body that makes it easy to accurately stop the propelling body during driving at a predetermined position.

[0007]

[Embodiment] Next, an embodiment of a hydraulic circuit for a propellant according to the present invention will be described with reference to the drawings. FIG. 1 shows a propulsion device 2 for the propulsion method.

In the propulsion device 2, an excavation pipe 3 having a propulsion head 15 for propelling in the soil between the first construction pit A and the second construction pit B, and a plurality of pipes following the excavation pipe 3. The propulsion unit 4 and the propulsion pipe 4 are flexibly connected in advance via a joint (not shown) to form a propulsion unit 5. This propulsion unit 5 is formed by forming a hole in the ground by the propulsion head 15 and then winding it up by the propulsion unit winding drum 6 installed outside the ground part of the first construction pit A on the propulsion device 2 side. is there.

A pressing mechanism 7 including a combination of a clamper 7a and a pressing cylinder 7b is installed at the bottom of the first construction pit A. The propulsion unit 5 rewound from the propulsion unit winding drum 6 is supplied to the pressing mechanism 7 via a guide roller 8. Then, the pressing mechanism 7 moves the pressing unit 7 forward by operating the pressing cylinder 7b while clamping the pressing unit 5 with the clamper 7a, and the pressing cylinder 7b is released with the clamper 7a released. By operating in reverse, the new portion of the propulsion unit 5 is prepared for clamping, and by repeating this, the propulsion unit 5 is pushed from the rear side for propulsion. In addition, 9 is a support jack which supports the side wall of the construction pit A from the inside.

As shown in FIG. 1, the propulsion head 15 is formed with a pressure receiving surface 17 for receiving earth pressure during propulsion and changing the propulsion direction of the propulsion head 15 to the direction in which the earth pressure is received. is there. The drive shaft 14 extending from the excavation pipe 3 at the tip of the propulsion unit 5 is driven and rotated by hydraulic pressure to change the direction of the pressure receiving surface 17, thereby propelling the propulsion unit 5 flexibly. It is configured to be able to.

A cylinder 10 is provided in the propulsion unit 5, a drive shaft driving piston 11 is provided slidably with respect to the cylinder 10, and first and second cylinder chambers 10 A are provided on both sides of the piston 11. , 10B are formed. The first and second oil passages 13 and 16 for supplying pressure oil are provided between the first and second cylinder chambers 10A and 10B and the oil tank T (this oil tank also serves as a drain tank). is there. The rotary drive mechanism 23 for rotating the drive shaft 14 includes a spiral groove 24 formed in a part of the inner peripheral surface of the excavation pipe 3 and a screwing convex portion 25 that engages with the spiral groove 24. A rotary drive piston 11 fitted in the excavation pipe 3, a drive shaft 14 having a spline shaft portion formed on the outer peripheral portion that meshes with a spline hole formed on the inner surface side of the piston 11, and the piston 11 of the piston 11. First and second oil passages 13 for reciprocating the piston 11 in the axial direction of the excavation pipe 3 by supplying and discharging pressurized oil to and from the first and second cylinder chambers 10A and 10B on both sides of the piston head 26, 16 and. A switching valve 18 is provided in each of the oil passages 13 and 16 so that the flow in the oil passage can be switched between the first to third states. In the switching valve 18, one of the first and second oil passages 13 and 16 is connected to the pump P, and the other oil passage is connected to the oil tank T. It is freely switchable between a second state in which the second oil passages 13 and 16 are in a neutral state and a third state in which the other oil passage is connected to the pump and the one oil passage is connected to the oil tank T. ing.

Further, in the first and second oil passages 13 and 16, between the first and second cylinder chambers 10 A and 10 B and the switching valve 18, there is a communication state in which they communicate with each other, and There are provided first and second shut valves 19 and 20 for switching to a shut-off state for shutting off the flow from the second cylinder chambers 10A and 10B, respectively. An interlocking mechanism 21 for interlocking the first and second shut valves 19 and 20 and the switching valve 18 is provided. The interlocking mechanism 21 is configured to interlock the operation of placing one of the first and second shut valves 19 and 20 with the shutoff state and the operation of placing the switching valve 18 in the neutral state. The shut valve and the oil tank 1 are provided outside the propulsion unit.

In the above configuration, when the propulsion head 15 is rotated by a predetermined angle as described above in order to make the propulsion head 15 moving straight ahead, the operation procedure and the operating state of the hydraulic circuit 22 are different from each other. It looks like this: For example, as shown in FIG. 1, the switching valve 18 is switched to the first state in which the first oil passage 13 is connected to the pump P and the second oil passage 16 is connected to the oil tank T. Then, the pressure oil is supplied into the first cylinder chamber 10A. Then, the piston 11 slides toward the second cylinder chamber 10B and the drive shaft 14 starts to rotate. When the rotation reaches a predetermined angle, as shown in FIG. 2, the interlocking mechanism 21 is operated to turn off the second shut valve 20 in the second oil passage 16, and the switching valve 18 is turned to the neutral state. It works in conjunction with the operation. At the same time when the interlocking operation is performed, the oil in the first oil passage 13 flows into the oil tank T, so that the pressure in the first cylinder chamber 10A on the side to which the pressure oil is supplied decreases, and The piston 11 can be prevented from moving, and the drive shaft can be prevented from rotating more than the above angle. As shown in FIG. 3, the first shut valve 19 is closed to fix the position of the piston 11.

The excavation pipe 3 and the propulsion pipe 4 are collectively referred to as a propelling body.

[Other Embodiments] In the above embodiments, the case where the propulsion bodies 3 and 4 are rotationally driven has been described. However, the present invention is applicable even when the propulsion bodies 3 and 4 are pressed or retracted. A hydraulic circuit can be applied.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 Hydraulic circuit diagram for propulsion body

FIG. 2 is a diagram showing an operating state of a hydraulic circuit.

FIG. 3 is a diagram showing an operating state of a hydraulic circuit.

[Figure 4] Overall view of the propulsion device

[Explanation of symbols]

 3, 4 Propulsion body 10 Cylinder 10A First cylinder chamber 10B Second cylinder chamber 11 Piston 13 First oil passage 16 Second oil passage 18 Switching valve 19 First shut valve 20 Second shut valve 21 Interlocking mechanism P pump T drain tank

Claims (1)

[Scope of utility model registration request] 1. A propellant driving piston (1) slidable with respect to a cylinder (10) provided in the propellant (3), (4).
1) is provided, and the first and second sides are provided on both sides of the piston (11).
The cylinder chambers (10A), (10B) are formed, and the first,
First and second oil passages (13) and (16) for supplying pressure oil to the second cylinder chambers (10A) and (10B) are provided, and the first and second oil passages (13) and (16) are provided. A first state in which one of the oil passages is connected to the pump (P) and the other oil passage is connected to the drain tank (T); and the first and second oil passages (13), (16) A switching valve (18) for switching between a second state in which the oil is in a neutral state and a third state in which the other oil passage is connected to the pump (P) and the one oil passage is connected to the drain tank (T). The first and second oil passages (1
3) and (16), the first and second cylinder chambers (10
A), (10B) and the switching valve (18) are cut off from each other, and the flow from the first and second cylinder chambers (10A), (10B) is shut off. The first and second shut valves (19), (2
0) are respectively provided for the propulsion body hydraulic circuits, the operation of putting one of the first and second shut valves (19), (20) in the shut-off state, and the switching valve (18) being neutralized. A hydraulic circuit for a propulsion body, which is provided with an interlocking mechanism (21) for interlocking with the operation for setting the state.