JP3535104B2 - Hydraulic device for driving tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe pile, and more particularly to a tool-driving hydraulic device for rotating a tool such as a steel pipe pile with a tip outer blade, a casing tube, and a kelly bar.

[0002]

2. Description of the Related Art Conventionally, in an auger device or a tubing device that pushes into the ground while rotating a steel pipe pile or a casing tube, or in a kelly drive device that pushes into the ground while rotating a kerry bar, a steel pipe pile, a casing tube, or a kelly bar is used. Tools such as grips are held by a chuck mechanism or held by a lock mechanism, hydraulic oil is supplied / discharged via a supply / discharge flow path in which a switching valve is installed in the hydraulic motor, and the hydraulic motor is supplied via the chuck mechanism or lock mechanism. The tool is rotated by.

For example, as shown in FIG. 6 , a hydraulic motor 1
A pair of supply / discharge passages 102, 104 is connected to 00, and the supply / discharge passages 102, 104 are connected to a switching valve 106. A hydraulic pump 110 is connected to the switching valve 106 via a high-pressure flow path 108, and a hydraulic tank 114 is connected to the switching valve 106 via a return flow path 112. At the time of stop, the switching valve 106 is switched to the stop position so that the supply / discharge passage 1
02, 104, the high-pressure flow path 108, and the return flow path 112 are communicated with each other.

Further, as shown in FIG. 7 , there is also known one in which a brake valve 116 is provided in a pair of supply / discharge passages 102 and 104. The brake valve 116 includes a pilot type switching valve 118 that is switched by introducing pilot pressure,
The pilot type switching valve 118 was provided with a stop position in which check valves 120 and 122 for restricting the outflow of hydraulic oil from the hydraulic motor 100 via the pair of supply / discharge passages 102 and 104 were provided.

The brake valve 116 includes a pair of relief valves 12 that connect a pair of supply / discharge passages 102 and 104 to each other.
Often equipped with 4,126. When the hydraulic motor 100 is rotationally driven by the action of the inertial force of the rotating portion when the hydraulic motor 100 is switched to the stop position, the hydraulic oil discharged from the hydraulic motor 100 is supplied and discharged through the pair of check valves 120 and 122. Outflow to 102 and 104 is regulated, and it is configured to be returned to the hydraulic motor 100 via the relief valves 124 and 126.

[0006]

However, when the hydraulic motor 100 is pushing the tool into the ground while rotating the tool, particularly when the ground is a long object and the resistance of the ground at the tip is large, the torque is applied. The tool may be twisted at an appropriate angle.

In the former case shown in FIG. 6 of the related art, when the switching valve 106 is switched to the stop position in this state, the hydraulic motor 100 causes the supply / discharge channels 102 and 104 and the return channel 11 to flow.
It communicates with the hydraulic tank 114 via 2. Therefore, there is a problem that an external force due to the twist of the tool is applied to the hydraulic motor 100, the hydraulic motor 100 is rotated vigorously, and the hydraulic motor 100 may be damaged beyond its allowable rotation speed. It was

Further, in the latter one shown in FIG. 7 of the prior art,
When the switching valve 106 is switched to the stop position, the check valves 120 and 122 of the brake valve 116 regulate the outflow of hydraulic oil from the hydraulic motor 100 to the supply / discharge passages 102 and 104, so that the tool is twisted. It will be held in the open state.

Among the latter ones shown in FIG. 7 of the related art, for example, in a tubing apparatus, a steel pipe pile or a casing tube as a tool is chucked and a hydraulic motor 100 rotates the steel pipe pile or the casing tube to rotate the steel pipe pile or the casing tube. After pushing in for one stroke and pushing for one stroke, once release the chuck, extend the thrust cylinder, and chuck the steel pipe pile or casing tube again. When the chuck was opened, there was a problem that the torsion of the steel pipe pile and the casing tube suddenly returned, the chuck mechanism was damaged, and noise was generated.

Further, among the latter ones shown in FIG. 7 of the related art, for example, in a kelly drive device, the kerry bar is slightly pulled up in order to reduce the resistance of the ground while the rotation of the kerry bar as a tooling tool by the hydraulic motor is stopped. When,
There was a problem that the torsion suddenly returned and the lock mechanism was damaged or noise was generated.

An object of the present invention is to provide a hydraulic device for driving a tool, which prevents damage to the device and generation of noise.

[0012]

In order to achieve the above object, the present invention takes the following means in order to solve the object. That is, hydraulic oil is supplied and discharged through a supply and discharge flow path in which a switching valve is interposed in a hydraulic actuator that rotates or swings a tool,
In a tool-applying hydraulic device that is inserted into the ground while rotating or swinging the tool, a restriction valve that restricts the outflow from the hydraulic actuator when stopped is provided in the supply / discharge passage, and the restriction is performed. A throttle is provided in parallel with the valve , and
The restriction valve and the throttle are integrated into the switching valve.
Is it construction instrument drive hydraulic device, characterized in that it.

Alternatively, the switching valve may be directly attached to the port of the hydraulic actuator.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a tubing device, in which a plurality of lifting cylinders 4 for lifting the lifting frame 3 are assembled on a base frame 2 which is held in a horizontal state by a horizontal jack (not shown), and a bearing 5 is mounted on the lifting frame 3. The ring-shaped rotating member 6 is rotatably supported via.

A gear 7 is formed on the outer periphery of the rotary member 6, and a drive gear 8a and a gear 7 fixed to a rotary shaft of a hydraulic motor 8 as a hydraulic actuator provided on the elevating frame 3 are connected via an idle gear 9. The rotary member 6 is rotated by the rotation of the hydraulic motor 8.

A taper hole 11 through which a casing tube 10 as a tool is inserted is formed on the inner circumference of the rotary member 6, and the taper hole 11 is formed so as to reduce its diameter downward. Above the rotating member 6, there is provided a bracket 13a which is moved up and down by a chuck cylinder 12 arranged on the elevating frame 3.
A rotating frame 13c is supported between the rotating member 6 and the rotating member 6 via a bearing 13b so as to move up and down together with the bracket 13a. Rotating frame 13c
The wedge-shaped wedge member 14 suspended from the taper hole 11
And the casing tube 10.

The tooling tool is not limited to the cheasing tube 10 but may be a steel pipe pile, and particularly a thin steel pipe pile. When a kelly drive device is used instead of the tubing device 1, the kerry bar corresponds to the tooling tool. The tooling tool refers to an elongated tool such as a steel pipe pile, a casing tube, or a kelly bar that is inserted into the ground while rotating or rocking to construct a pile.

In this embodiment, the chuck mechanism 16 is composed of the rotary member 6, the chuck cylinder 12, the bracket 13a, the bearing 13b, the rotary frame 13c, and the wedge member 14.
Are formed. Further, as shown in FIG. 2, a hydraulic device 20 is connected to the hydraulic motor 8. Incidentally, as described above
The same members as those shown in FIGS. 6 and 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

The switching valve 106 is provided in the high pressure passage 1 as in the conventional case.
08 and one supply / exhaust passage 102a, and the return flow passage 112 and the other supply / exhaust passage 104a are connected to the normal rotation position 106a, the high-pressure passage 108, and the pair of supply / exhaust passages 10a.
2a, 104a, a stop position 106b for communicating the return flow path 112 with each other, a high-pressure flow path 108 and the other supply / discharge flow path 104
A reverse rotation position 106c is provided which communicates with the return passage 112 and one of the supply and discharge passages 102a. The switching valve 106 is switched according to the pilot pressure introduced from the outside.

A pilot type switching valve 22 is connected to the supply / discharge channels 102a, 104a, and the pilot type switching valve 22 and the hydraulic motor 8 form a pair of supply / discharge channels 102b, 1b.
04b, the supply and discharge flow paths 102a, 102
A pilot type switching valve 22 is provided at b, 104a and 104b.

The pilot type switching valve 22 has a forward rotation position 22.
a, a stop position 22b, and a reverse rotation position 22c. The forward rotation position 22a communicates one of the supply / exhaust passages 102a, 102b via a check valve 23 that allows the flow into the hydraulic motor 8, and the other supply / exhaust passages 104a, 104b.
To communicate.

The stop position 22b is located at one of the supply / discharge channels 102.
The valves a and 102b are communicated with each other via a check valve 24 as a control valve that controls the outflow from the hydraulic motor 8, and a throttle 26 connected in parallel with the check valve 24 is provided. Further, the other supply / discharge passages 104a and 104b are communicated with each other via a check valve 28 as a control valve that controls the outflow from the hydraulic motor 8, and a throttle 30 connected in parallel with the check valve 28 is provided. .

The reverse position 22c is the other supply / discharge channel 104.
a and 104b are communicated with each other via a check valve 29 which allows the hydraulic motor 8 to flow into the hydraulic motor 8, and one of the supply / discharge channels 10 is connected.
2a and 102b are connected. Pilot type switching valve 22
Is switched to the forward rotation position 22a by the pilot pressure introduced from one supply / discharge channel 102a, and is switched to the reverse position 22c by the pilot pressure introduced from the other supply / discharge channel 104a. In addition, both supply / discharge channels 102a,
When the pressure of 104a is low and the pilot pressure is not introduced, it is switched to the stop position 22b.

Incidentally, the pilot type switching valve 22 of the present embodiment
Then, the check valve 23 at the forward rotation position 22a and the stop position 22
The check valve 24 of b, the check valve 28 of the stop position 22b, and the check valve 29 of the reverse rotation position 22c are denoted by different reference numerals in FIG. 2, but in reality, they are commonly used. .

Further, in this embodiment, the check valves 23,
It is configured as a pilot type switching valve 22 in which the valves 24, 28 and 29 and the throttles 26 and 30 are integrally incorporated. Further, the relief valve 124, 126 are also integrally incorporated, the pilot selector valve 22 is, as shown in FIG. 5, it is attached directly to the port (not shown) of the hydraulic motor 8. Thereby, the hydraulic motor 8 can be easily added.

Next, the operation of the hydraulic tool driving tool of the present embodiment described above will be described. First, the casing tube 10 is inserted into the rotating member 6, and the chuck cylinder 12 is driven to lower the bracket 13a. As a result, the wedge member 14 is inserted into the tapered hole 11 and the casing tube 10 via the bearing 13b and the rotating frame 13c.
And the wedge member 14 is inserted between the casing tube 1 and
It is pressed to the outer circumference of 0. Therefore, the casing tube 10 is gripped by the chuck mechanism 16.

Then, the switching valve 106 has the forward rotation position 106a.
Is switched to the high pressure flow path 1 from the hydraulic pump 110.
The high pressure hydraulic oil is supplied to one of the supply / discharge passages 102a via 08 and the switching valve 106. This one supply / discharge channel 102a
The pilot type switching valve 22 is switched to the forward rotation position 22a by the pilot pressure introduced from the hydraulic motor 8
One of the supply / discharge passage 102a, the pilot type switching valve 22,
High-pressure hydraulic oil is supplied through one of the supply / discharge passages 102b.

Further, from the hydraulic motor 8 to the other supply / discharge passage 1
04b, pilot type switching valve 22, the other supply and discharge flow path 10
The hydraulic oil is returned to the hydraulic tank 114 via the 4a, the switching valve 106, and the return flow path 112, and the hydraulic motor 8 is normally rotated. Therefore, the drive gear 8a, the idle gear 9, the gear 7,
The casing tube 10 is rotated via the chuck mechanism 16. Further, when the elevating cylinder 4 is driven to lower the elevating frame 3, the casing tube 10 is pushed into the ground while being rotated through the rotating member 6, the wedge member 14 and the like.

The casing tube 10 is attached to the lifting cylinder 4
After pushing in by one stroke, the switching valve 106 is switched to the stop position 106b. Thereby, the high pressure flow path 10
8, a pair of supply / discharge channels 102a and 104a, return channel 11
2 are communicated with each other, and a pair of supply / discharge channels 102a, 102a, 10
The hydraulic pressure of 4a becomes low. Therefore, the pilot type switching valve 22 is switched to the stop position 22b.

At that time, due to the twisting of the casing tube 10, the chuck mechanism 16, the gear 7, the idle gear 9,
An external force for rotating the hydraulic motor 8 is applied via the drive gear 8a. With this external force, the hydraulic motor 8 acts as a pump, and high-pressure hydraulic oil corresponding to the external force due to the twist is discharged from the hydraulic motor 8. For example, when high-pressure hydraulic oil is discharged from the hydraulic motor 8 to the one supply / discharge passage 102b, the outflow is regulated by the check valve 24 of the pilot type switching valve 22, but one supply / discharge via the throttle 26. The hydraulic oil gradually flows into the flow path 102a. In the other supply / discharge channels 104a and 104b, the hydraulic oil is sucked into the hydraulic motor 8 via the check valve 28.

Therefore, since the amount of hydraulic oil discharged from the hydraulic motor 8 is throttled by the throttle 26, the hydraulic motor 8 is gently rotated according to the throttle amount of the throttle 26. Therefore,
When stopped, the casing tube 10 does not suddenly rotate due to its twisting, so that damage to the hydraulic motor 8 can be prevented. Further, the hydraulic motor 8 is gently rotated until the twist of the casing tube 10 is eliminated. After that, the casing tube 10 by the chuck mechanism 16
Even if the grip is released, the casing tube 10 does not rotate due to torsion, and the chuck mechanism 16 is not damaged or noise is not generated.

Casing tube 1 of chuck mechanism 16
After releasing the grip of 0, the elevating cylinder 4 is driven to raise the elevating frame 3 by one stroke, and then the casing tube 10 is gripped by the chuck mechanism 16 again, and the above-described operation is repeated.
Push in while rotating to a predetermined depth. The switching valve 1
Similarly, when the drive is stopped by switching from the reverse rotation position 106c of 06 to the stop position 106b, the hydraulic motor 8 is gently rotated by the diaphragm 30 to prevent the hydraulic motor 8 and the chuck mechanism 16 from being damaged or generating noise. To do.

Further , the chuck mechanism 16 described above is not limited to the one using the wedge member 14, but as shown in FIG. 3 , an arcuate chuck member 60 disposed on the rotating member 6 and both ends of the chuck member 60. A pair of arcuate rocking members 62 and 64 that are rockably supported by the chuck cylinder 66, and the rocking members 62 and 64 are rocked by the chuck cylinder 66 to grip the outer circumference of the casing tube 10. But it's okay.

Furthermore, tubing apparatus 1 described above has a configuration in which the rotary member 6 can be rotated more than one revolution by the hydraulic motor 8 is not limited to this, FIG. 3, as shown in FIG. 4,
A structure in which the rotating member is rocked by rocking cylinders 68 and 70 as hydraulic actuators may be used. Even in that case, the rocking cylinders 68, 70 are connected to the pair of supply / discharge passages 10.
2, 104 may be connected, and the pilot type switching valve 22 described above may be provided in the supply / discharge channels 102, 104 .

The present invention is not limited to such an embodiment as described above, and can be carried out in various modes without departing from the scope of the present invention.

[0036]

As described above in detail, in the hydraulic tool driving tool of the present invention, when the tool is stopped, the hydraulic actuator is gently driven by the external force generated by the twist of the tool, and the hydraulic actuator is driven by the rapid rotation of the tool. As a result, it is possible to prevent damage to the chuck mechanism and the chuck mechanism and to prevent noise from being generated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a tubing apparatus using a hydraulic device for driving a tool as an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of a hydraulic device for driving a tool according to the present embodiment.

FIG. 3 is a plan view of a chuck mechanism as another embodiment.

FIG. 4 is a hydraulic circuit diagram showing a main part of a tool application hydraulic system using a cylinder as a hydraulic actuator according to another embodiment.

FIG. 5 is an enlarged view of a switching valve and a hydraulic motor of this embodiment.

FIG. 6 is a hydraulic circuit diagram of a conventional hydraulic device for driving a tool.

FIG. 7 is a hydraulic circuit diagram of another conventional hydraulic device for driving a tool.

[Explanation of symbols]

1 ... Tubing device 4 ... Lifting cylinder 8,100 ... Hydraulic motor 10 ... Casing tube 11 ... Tapered hole 14 ... Wedge member 16 ... Chuck mechanism 20 ... Hydraulic device 22 ... Pilot type switching valve 23, 24, 28, 29 ... Check valve 26,3 0,5 6,58 ... aperture Ri 6 2, 64 ... swinging member 66 ... chuck cylinder 68, 70 ... rocking cylinder 102,102a, 102b, 104,104a, 10
4b ... Supply / exhaust flow path 106 ... Switching valve 108 ... High pressure flow path 110 ... Hydraulic pump 112 ... Flow path 114 ... Hydraulic tank 116 ... Brake valve

Continuation of the front page (56) References JP-A-10-281103 (JP, A) JP-A-2-180301 (JP, A) Actual opening 5-42705 (JP, U) Toshio Kaneko, hydraulic equipment and application circuits -Revised edition-, Nikkan Kogyo Shimbun, Japan, December 25, 1977, p. 248, "10.1.3 Circuits for reliable locking" (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 7/22 E21B 3/02 F15B 11/00

Claims (2)

(57) [Claims] 1. A hydraulic actuator for rotating or rocking a tool, supplies and drains hydraulic oil through a supply / discharge channel in which a switching valve is interposed, and rotates or rocks the tool to the ground. In the tool-applying hydraulic device to be inserted, a regulating valve for regulating the outflow from the hydraulic actuator at the time of stoppage is provided in the supply / discharge channel , and a throttle is provided in parallel with the regulating valve , and the regulating valve is provided. And the throttle are integrated into the switching valve.
A hydraulic system for driving tools that has been incorporated . 2. The hydraulic device for driving a tool according to claim 1, wherein the switching valve is directly attached to a port of the hydraulic actuator.