WO2018124351A1

WO2018124351A1 - Automatic clamping apparatus for extracting casing

Info

Publication number: WO2018124351A1
Application number: PCT/KR2017/000014
Authority: WO
Inventors: 이상식; 이상태; 송수동; 임종규
Original assignee: (주)부마씨이
Priority date: 2016-12-30
Filing date: 2017-01-02
Publication date: 2018-07-05
Also published as: KR101840396B1

Abstract

The present invention relates to an automatic clamping apparatus for extracting a casing, the apparatus comprising: an upper frame means having an upper frame into which the casing is inserted, and a wedge clamp; an intermediate frame means, which has an intermediate frame positioned at the lower part of the upper frame and having the casing inserted thereinto, and a clamp body mounted at the intermediate frame; a lower frame means having a lower frame into which the casing is inserted, a retaining cylinder extended and contracted by hydraulic pressure, and a retainer capable of holding the lower part of the casing when the retaining cylinder is contracted; a clamping cylinder extended and contracted by hydraulic pressure so as to enable the wedge clamp to hold the upper part of the casing; a crowd cylinder of which one end is coupled to the upper frame and the other end is coupled to the lower frame so as to enable the crowd cylinder to be contracted when the retainer holds the lower part of the casing; and a control means for supplying the hydraulic pressure to the clamping cylinder.

Description

Automatic clamping device for casing draw

The present invention relates to an automatic clamping device for casing draw, and more particularly, to an automatic clamping device for casing draw which can prevent the casing from falling out during casing extraction.

Casing rotator is equipment used for foundation work to build pillars or piers of large buildings. It is used to insert casings (steel pipes so that excavated holes do not collapse) to the required depth, and to extract casings after concrete pouring.

2 to 4 show an embodiment of an automatic clamping device for casing draw as disclosed in Korean Patent No. 10-1536302. The process of extracting the casing by the automatic clamping device for the conventional casing draw disclosed in FIGS. 2 to 4 is as follows.

When the clamping cylinder 400 is reduced, the upper frame 310 descends and the wedge clamp 330 is inserted into the clamp body 270. The wedge clamp 330 then grips the top of the casing. The retainer cylinder 170b is extended to separate the retainer 170a from the casing. The crowd cylinder 550 is extended to raise the casing held by the wedge clamp 330. When the casing is raised, the retaining cylinder 170b is again reduced to grip the casing with the retainer 170a. When the casing is gripped by the retainer 170a, the clamping cylinder 400 is raised to separate the wedge clamp 330 from the casing. When the casing is separated from the wedge clamp 330, the crowd cylinder 550 is reduced to lower the upper frame 310. This process is repeated to extract the casing with the automatic clamping device for casing draw. That is, when the casing is raised, the hydraulic pressure is supplied to the clamping cylinder 400 and the casing is gripped by the wedge clamp 330. When the upper frame 310 is lowered, the hydraulic pressure is supplied to the retainer cylinder 170b to maintain the retainer 170a. The casing was gripped with.

In the conventional case, the operator manually supplied hydraulic pressure to the clamping cylinder and the retainer cylinder. At this time, hydraulic pressure is supplied to the clamping cylinder when the retainer is separated from the casing, and hydraulic pressure is supplied to the retainer cylinder when the wedge clamp is removed from the casing. So either the wedge clamp or the retainer must grip the casing. However, when the hydraulic pressure is not supplied to both the clamping cylinder and the retainer cylinder due to the operator's mistake, the casing is not fixed and there is a problem that the casing falls.

The present invention is to solve the above problems, it is an object of the present invention to provide an automatic clamping device for drawing the casing to prevent the casing does not fall when the casing is not gripped during casing extraction.

An automatic clamping device for casing drawing according to the invention comprises an upper frame means, an intermediate frame means, a lower frame means, a clamping cylinder, a crowd cylinder and a control means. The upper frame means has an upper frame and a wedge clamp. The upper frame is inserted into the casing. The wedge clamp has a wedge clamp coupled to the upper frame for gripping the upper portion of the casing. The intermediate frame means has an intermediate frame and a clamp body. The intermediate frame is located below the upper frame and the casing is inserted. The clamp body is mounted to the intermediate frame such that the wedge clamp is inserted to grip the upper portion of the casing. The lower frame means comprises a lower frame, a retaining cylinder and a retainer. The lower frame is located below the intermediate frame and the casing is inserted. The retaining cylinder is installed in the lower frame and stretched hydraulically. The retainer is coupled to the retaining cylinder so that the lower portion of the casing can be gripped when the retaining cylinder is reduced. The clamping cylinder is hydraulically stretched so that one end is coupled to the upper frame and the other end is coupled to the wedge clamp so that the wedge clamp can grip the upper portion of the casing. The crowd cylinder is coupled to the upper frame and the other end is coupled to the lower frame so that the wedge clamp extends when the wedge clamp grips the upper portion of the casing and shrinks when the retainer grips the lower portion of the casing. The control means supplies the hydraulic pressure to the retaining cylinder so that the retainer grips the casing when the wedge clamp tries to release the casing after the crowd cylinder is extended, and after the crowd cylinder is lowered the retainer is Attempting to release the casing causes the wedge clamp to supply the hydraulic pressure to the chuck cylinder so as to grip the casing.

According to the present invention, the control means is to supply the hydraulic pressure to any one of the clamping cylinder and the retaining cylinder to grip the casing. Thus, casing can be prevented from falling during casing extraction. Therefore, the casing can be prevented from being broken or lost.

1 is a conceptual diagram of one embodiment of an automatic clamping device for casing draw according to the invention,

2 is a conceptual diagram of a prior art;

3 is a front view of the embodiment shown in FIG.

4 is a perspective view of the lower frame means of the embodiment shown in FIG.

1: casing 10, 300: upper frame means

11, 310: upper frame 13, 330: wedge clamp

20, 200: intermediate frame means 21: intermediate frame

23, 270: clamp body 30, 100: lower frame means

31, 110:

Lower frame

33, 170b: Retaining cylinder

35, 170a: Retainer 40, 400: Clamping cylinder

50, 550: crowd cylinder 530: lower guide

With reference to Figure 1 will be described in detail an embodiment of an automatic clamping device for the casing draw according to the present invention.

Automatic clamping device for drawing the casing according to the present invention is the upper frame means 10, the intermediate frame means 20, the lower frame means 30, the clamping cylinder 40, crowd cylinder 50, control means (not shown) ).

The upper frame means 10 has an upper frame 11 and a wedge clamp 13. The upper frame 10 is inserted into the casing (1).

The wedge clamp 13 serves to grip the upper part of the casing 1 and is coupled to the upper frame 10. In the present embodiment, the wedge clamp 13 has a wedge shape on one surface thereof.

The intermediate frame means 20 has an intermediate frame 21 and a clamp body 23. The intermediate frame 21 is located below the upper frame 11 and the casing 1 is inserted.

The clamp body 23 is mounted to the intermediate frame 21 so that the wedge clamp 13 can be inserted to grip the upper portion of the casing 1. In the present embodiment, the clamp body 23 is formed in a wedge shape so that one surface may contact one surface of the wedge clamp 13.

The lower frame means 30 has a lower frame 31, a retaining cylinder 33 and a retainer 35. The lower frame 31 is located below the intermediate frame 21 and the casing 1 is inserted.

The retaining cylinder 33 is hydraulically expanded and installed in the lower frame 31.

The retainer 35 is coupled to the retaining cylinder 33 so that the lower portion of the casing 1 can be gripped when the retaining cylinder 33 is reduced.

The clamping cylinder 40 is hydraulically expanded so that the wedge clamp 13 can grip the upper part of the casing 1. To this end, the clamping cylinder 40 has one end coupled to the upper frame 11 and the other end coupled to the wedge clamp 13.

One end of the crowd cylinder 50 is coupled to the upper frame 11 and the other end is coupled to the lower frame 31 is stretched. During casing extraction, the crowd cylinder 50 is stretched when the wedge clamp 13 grips the upper part of the casing 1 and shrinks when the retainer 35 grips the lower part of the casing 1.

The control means serves to prevent the casing 1 from falling. For this purpose, the control means supplies hydraulic pressure to the retaining cylinder 33 when the wedge clamp 13 tries to release the casing 1 after the crowd cylinder 33 is extended. The retainer 35 then grips the bottom of the casing 1. Further, the control means supplies hydraulic pressure to the clamping cylinder 40 when the retainer 35 tries to release the casing 1 after the crowd cylinder 50 is reduced. The wedge clamp 13 is then inserted into the clamp body 33 to grip the upper portion of the casing (1). In this embodiment, the control means can be set to on / off. If the control means is set to on, the above-described function is performed, and if it is set to off, the operator can work the above work manually as in the prior art.

The operation of this embodiment will be described. After the operator completes the rotator work, the control means supplies hydraulic pressure to the clamping cylinder 40 when the casing is extracted, and the clamping cylinder 40 is reduced. Then, the wedge clamp 13 is inserted into the clamp body 23 to grip the upper portion of the casing (1). And the control means stops the hydraulic pressure supplied to the retaining cylinder 33, and then separates the retainer 35 from the casing (1). Then, the crowd cylinder 50 is extended to move the casing 1 upward. After the crowd cylinder 50 is extended, the casing 1 is moved upward, and the control means supplies hydraulic pressure to the retaining cylinder 33 to hold the lower part of the casing 1 with the retainer 35. And the control means stops the hydraulic pressure supplied to the clamping cylinder 40 to separate the wedge clamp 13 from the casing (1). The wedge clamp 13 is separated from the casing 1 and the crowd cylinder 50 is reduced to move the upper frame 11 and the intermediate frame 21 downward. The intermediate frame 21 is moved downward, and the control means supplies hydraulic pressure to the clamping cylinder 40 to grip the casing 1 with the wedge clamp 12. Then, the control means stops the hydraulic pressure supplied to the retaining cylinder 33 to separate the retainer 35 from the casing 1. In this embodiment, since the casing 1 is extracted by repeating the above process, the casing 1 may be prevented from falling.

Claims

An upper frame means having an upper frame into which a casing is inserted, and a wedge clamp coupled to the upper frame to hold an upper portion of the casing;

An intermediate frame means positioned below the upper frame and having an intermediate frame into which the casing is inserted, and a clamp body mounted to the intermediate frame to insert the wedge clamp to grip the upper portion of the casing;

Located in the lower portion of the intermediate frame and the lower frame is inserted into the casing, the retaining cylinder is installed in the lower frame and hydraulically stretched, and the retaining cylinder is reduced so that the lower portion of the casing to grip A lower frame means having a retainer coupled to the inning cylinder,

A clamping cylinder having one end coupled to the upper frame and the other end coupled to the wedge clamp such that the wedge clamp is hydraulically stretched to grip the upper portion of the casing;

A crowd cylinder coupled to the upper frame and one end coupled to the lower frame such that the wedge clamp extends when the upper part of the casing is gripped and contracts when the retainer grips the lower part of the casing;

When the wedge clamp tries to release the casing after the crowd cylinder is extended, the hydraulic pressure is supplied to the retaining cylinder so that the retainer grips the casing, and the retainer attempts to release the casing after the crowd cylinder is lowered. And lowering control means for supplying the hydraulic pressure to the clamping cylinder so that the wedge clamp grips the casing.