KR20100117356A

KR20100117356A - Shock-absorbing device, and excavation hammer having the same

Info

Publication number: KR20100117356A
Application number: KR1020090036052A
Authority: KR
Inventors: 김정겸
Original assignee: (주)탑드릴
Priority date: 2009-04-24
Filing date: 2009-04-24
Publication date: 2010-11-03

Abstract

PURPOSE: A shock absorbing device and a hammer for ground excavation therewith are provided to conveniently control load carrying capacity of a shock absorbing member using the amount of coil springs. CONSTITUTION: A shock absorbing device comprises a pair of frames and multiple coil springs(203). The frames face with each other. The coil springs are inserted between the frames and are arranged to be separated from each other. The frames have ring-shaped bodies(201,202). Coupling holes are formed on the ring-shaped bodies at uniform intervals.

Description

SHOCK-ABSORBING DEVICE, AND EXCAVATION HAMMER HAVING THE SAME}

The present invention relates to a shock absorber of a ground drilling hammer, and more particularly, to a shock absorber and a ground drilling hammer having the same to mitigate the impact applied when the piston (Piston) is raised.

Ground excavation hammer is rotated as a whole to receive the rotational force and high pressure air from the excavator at the same time configured to hit the ground (Bit) to perform the function of excavating the soil layer and rock layer.

As shown in FIG. 1, the ground drilling hammer includes a top sub 10 having an air inlet 10 a, a case 11 coupled to a lower part of the top sub 10, and A piston 13 is installed in the case 11 so as to reciprocate up and down, and a bit 14 that receives an impact force from the piston 13 and strikes the ground. In addition, an air distributor 12 is provided between the top sub 10 and the piston 13 to distribute the air introduced through the air inlet hole 10a to reciprocate the piston 13. Ground excavation hammer having such a configuration is disclosed in the Republic of Korea Utility Model Registration No. 331848.

In the ground drilling hammer, the hammer body is rotated by the rotational force provided from the ground excavator, and at the same time, the piston 13 is selectively lowered by the high pressure air provided from the ground excavator to hit the bit 14 to excavate the ground. To perform the operation.

However, the conventional ground excavation hammer does not properly absorb the physical shock generated by the piston 13 rising after hitting the bit 14, the air distributor 12, the top sub 10, the check valve ( 15), or a problem that frequently occurs that the connection parts are broken.

Although the shock absorbing member 16 is provided between the top sub 10 and the air distributor 12 to absorb the shock applied to the air distributor 12 when the piston 13 is raised, the conventional shock absorbing member 16 is provided. In fact, it is true that it is difficult to properly absorb the enormous compressive force and mechanical impact force applied from the piston 13.

Typically, the buffer member 16 is a leaf spring or a rubber ring (Rubber Ring) is installed to surround the top of the distributor.

The leaf spring has a structure in which several leaf springs 16a to 16d in a ring shape having an inclined cross section are overlapped as shown in FIG. 1. However, the leaf spring is not easy to manufacture, and in order to cushion the impact force of the piston, a plurality of leaf springs must be overlapped in series, thereby making the hammer bulky.

On the other hand, the rubber ring (not shown) is not only insufficient to alleviate the impact of the large force generated from the piston, but also has a disadvantage of severe wear.

The present invention has been made in view of the above problems, and has a shock absorber having a structure in which coil springs are arranged in parallel so as to effectively buffer a physical shock from a piston without causing an increase in the volume of a hammer. The purpose is to provide a ground drilling hammer.

In order to achieve the above object, a shock absorber according to the present invention includes a pair of frames facing each other; And a plurality of coil springs interposed between the pair of frames and elastically biased in a direction in which the frames are spaced apart from each other and arranged to be spaced apart from each other along a circumference of the frame.

Preferably, the pair of frames has a ring-shaped body, and the coil spring is a mold spring.

Fastening holes for fastening bolts are formed in the frame at regular intervals along the planar portion of the ring-shaped body, and the depth from the surface of the frame to the head surface of the bolt is preferably coincident with the distance between the frames.

According to another aspect of the invention, the top sub-formed inlet hole for the inlet of air; A case coupled to the bottom of the top sub; A piston which is installed to reciprocate vertically in the case and is driven by air introduced through the inlet hole; A bit mounted in the case to receive the impact force from the piston and strike the ground; And elastically biased in a direction interposed between the pair of ring-shaped frames and the pair of ring-shaped frames facing up and down and spaced apart from each other to be installed in the case so as to alleviate the shock generated when the piston is raised. There is provided a ground drilling hammer comprising a; buffer member having a plurality of coil springs arranged to be spaced apart from each other along the circumference of the ring-shaped frame.

Preferably, a mold spring may be employed as the coil spring of the buffer member.

Preferably, the ground excavation hammer further comprises an air distributor disposed between the top sub and the piston for distributing air flowing through the inlet hole toward the piston, wherein the buffer member is the top sub and the air Interposed between the distributors to mitigate the impact on the air distributor when the piston is raised.

According to the present invention, since the buffer is made by a plurality of coil springs arranged in parallel in the shock absorbing member, it is possible to mitigate a strong physical shock applied from the piston while keeping the thickness of the shock absorbing member slim.

In addition, the load resistance of the buffer member can be conveniently adjusted according to the number of coil springs arranged at regular intervals in the buffer member, thereby providing a buffering performance that meets the specifications of the ground drilling hammer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Figure 2 is a cross-sectional view showing the configuration of the ground drilling hammer according to a preferred embodiment of the present invention.

Referring to Figure 2, the ground drilling hammer according to a preferred embodiment of the present invention, the tubular case 102 is coupled to the lower portion of the top sub-101, the air distributor 103 inside the case 102, The piston 106, the bit 107 and the shock absorbing member 200 has a structure mounted.

A joint 100 for coupling with an excavator is connected to an upper portion of the top sub 101, and an air inlet hole 101a for introducing air provided from the excavator into the hammer is formed therein.

The air distributor 103 is fixed between the top sub 101 and the piston 106 to distribute the air introduced through the air inlet hole 101a toward the piston 106. The check valve 104 is elastically coupled to the center of the upper end of the air distributor 103 to prevent the air introduced into the hammer through the air inlet hole (101a) to flow back and out again.

The lower portion of the air distributor 103 is fitted with a sleeve 105 for guiding the sliding of the piston 106.

The piston 106 is installed so as to reciprocate up and down while the body is partially fitted into the sleeve 105, and is operated by high pressure air to strike the bit 107 while repeating the lifting movement to impact the ground excavation To provide.

The buffer member 200 is installed to surround the upper circumference of the air distributor 103 to absorb the physical shock generated when the piston 106 is raised. That is, the shock absorbing member 200 buffers the physical shock generated when the sleeve inner space S of the upper portion of the piston 106 is compressed by the rising of the piston 106, and the top sub-101 from the air distributor 103. ) To absorb shock force so that it is not transmitted.

3 and 4 show the detailed configuration of the buffer member 200 provided in accordance with the present invention. As shown in the figure, the buffer member 200 includes a pair of ring-shaped frames 201 and 202 facing each other and a plurality of coil springs 203 arranged between the ring-shaped frames 201 and 202.

The ring-shaped frames 201 and 202 are configured in the form of a ring-shaped thin metal tube in which one flat portion is open as shown in FIG. Form a space.

Fastening holes 205 are formed in the planar portions of the ring-shaped frames 201 and 202 at regular intervals, and bolts 204 are coupled to the fastening holes 205 to fasten the pair of ring-shaped frames 201 and 202 to each other. At this time, the depth A from the surfaces of the ring frames 201 and 202 to the surface of the bolt head 204a preferably coincides with the spacing B between the ring frames 201 and 202. According to this structure, even if the shock absorbing member 200 is compressed until the ring-shaped frames 201 and 202 are in contact with each other, the bolt head 204a does not protrude out of the surfaces of the ring-shaped frames 201 and 202 so that the shock absorbing member 200 and the air distributor ( The phenomenon that the alignment state between the 103) is shifted can be prevented.

The coil spring 203 has a compression coil type spring structure that elastically biases in a direction in which the pair of ring-shaped frames 201 and 202 are spaced apart from each other during compression. As shown in FIG. 6, it is preferable that a mold spring having a relatively high load resistance is employed as the coil spring 203. Here, the number of coil springs 203 may be variously modified according to the load resistance required for the ground drilling hammer.

In the ground drilling hammer having the above configuration, the drilling proceeds by the piston 106 hitting the bit 107 by the high pressure air supplied through the air inlet hole 101a, and the rise of the piston 106 is performed. The impact force applied to the upper portion of the hammer by the buffer member 200 is relaxed.

In particular, the shock absorbing member 200 has a plurality of coil springs coupled in parallel between the pair of ring-shaped frame (201, 202) when a strong impact force is transmitted to the air distributor 103 and its surroundings by the rise of the piston 106 The 203 is simultaneously compressed to absorb the shock efficiently in a narrow space.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The following drawings, which are attached to this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a cross-sectional view showing the configuration of a ground drilling hammer according to the prior art.

Figure 3 is a perspective view showing the configuration of a buffer member provided in accordance with a preferred embodiment of the present invention.

4 is a plan view illustrating an arrangement structure of the coil spring in FIG. 3.

FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 3.

6 is a perspective view illustrating a configuration of a coil spring in FIG. 3.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS

100: joint 101: top sub

101a: air inlet hole 102: case

103: air distributor 104: check valve

105: sleeve 106: piston

107: bit 200: buffer member

201,202: ring-shaped frame 203: coil spring

Claims

A pair of frames facing each other; And

A plurality of coil springs interposed between the pair of frames and elastically biased in a direction in which the frames are spaced apart from each other, and arranged to be spaced apart from each other along a circumference of the frame.

The method of claim 1,

The pair of frames has a ring-shaped body,

The coil spring is a shock absorber, characterized in that the mold spring.

The method of claim 2,

The frame has fastening holes for fastening bolts are formed at regular intervals along the planar portion of the ring-shaped body,

And the depth from the surface of the frame to the head surface of the bolt coincides with the spacing between the frames.

Top sub-formed inlet hole for the inlet of air;

A case coupled to the bottom of the top sub;

A piston which is installed to reciprocate vertically in the case and is driven by air introduced through the inlet hole;

A bit mounted in the case to receive the impact force from the piston and strike the ground; And

It is installed in the case to mitigate the impact generated when the piston is raised, interposed between a pair of ring frame and the pair of ring frame facing up and down elastically biased in the direction to space the ring-shaped frame mutually and the And a buffer member having a plurality of coil springs arranged to be spaced apart from each other along a circumference of the ring-shaped frame.

The method of claim 4, wherein

The coil spring is ground excavation hammer, characterized in that the mold spring.

The method according to claim 4 or 5,

An air distributor positioned between the top sub and the piston to distribute air introduced through the inlet to the piston;

The cushioning member is interposed between the top sub and the air distributor, the ground drilling hammer, characterized in that to mitigate the impact on the air distributor when the piston is raised.