KR200390808Y1 - Crusher for cutting steel-structure with cutter body to which bushing is supportably inserted - Google Patents

Abstract

Disclosed is a crusher for cutting steel structures having a cutter body equipped with a bushing for preventing shortening of service life. The steel structure cutting crusher includes: first and second crushing arms pivotally coupled to a pivot central axis; A plurality of first through-holes, each of which is mounted to the first and second crushing arms and is formed of a second portion communicating with the first portion and the first portion and having a larger diameter than the first portion, First and second cutter bodies, wherein cylindrical bushings are mounted on a wall of the second portion of the first through hole; First and second cutters which are fastened to the first and second cutter bodies, respectively, to cut an object, wherein a plurality of second through holes corresponding to the first portions of the plurality of first through holes are formed; And driving means mounted to rear ends of the first and second crushing arms.

Description

Crusher for cutting steel-structure with cutter body to which bushing is supportably inserted}

The present invention relates to a crusher for cutting steel structures, and more particularly, to a crusher for cutting steel structures having a cutter body equipped with a support bushing for preventing shortened service life.

In general, as a method of dismantling steel structures such as steel concrete structures, steel frames, etc., a blasting method, a crushing method for cutting a structure using a crusher, etc. is commonly used. A diamond wire saw method for cutting an object by rotating the wire at high speed with a driving device, and a water jet method for destroying a structure by spraying high pressure water has been developed and used. The double crushing method is suitable for construction in the city due to the relatively low generation of pollution such as noise and vibration when dismantling the structure, and also eliminates the need for secondary work for cutting rebars by simultaneously cutting internal reinforcing bars when crushing concrete structures. Most commonly used.

The crusher used in such a crushing method has a pair of opposing crushing arms which are pivotally coupled to one central axis and equipped with a cutter body, and at the rear end of the pair of crushing arms, the amount of hydraulic cylinder As the end is mounted and the piston of the hydraulic cylinder reciprocates, the front end of the crush arm equipped with the cutter is opened and closed, so that an object located between the cutters of the crush arm is cut.

At present, a method of mounting the cutter on the cutter body of the crushing arm includes a method of fastening a screw into a threaded hole provided in the cutter body, and inserting a screw into a through hole provided in the cutter body and then attaching one end of the screw. There is a method of tightening with a nut.

In order to use the former method, the cutter body must be formed with a plurality of holes in which the screw thread to be inserted is formed, and the cutter must be formed with a through hole through which the screw to be inserted into the hole of the cutter body passes. However, since the manufacture of a hole having a screw thread corresponding to a predetermined screw is not easy, when the former method is used, fastening between the screw and the hole may not be easy, and the coupling thereof may not be secure.

Meanwhile, in the crusher using the latter method, as shown in FIG. 3, the recess 31c communicating with the through hole 31b and the through hole 31b in the cutter body 31 mounted on the crush arm (not shown). ) Is formed. The cutter 32 also has a through hole 32a through which the countersunk screw 37 penetrates corresponding to the through hole 31b of the cutter body 31. The countersunk screw 37 comes out of the recess 31c through the through hole 32a of the cutter 32 and the through hole 31b of the cutter body 31, and passes through the nut 33 in the recess 31c. By tightening, the cutter 32 is attached to the cutter body 31. Here, the diameter of the recess 31c is larger than the diameter of the nut 37, so that a space S is formed between the recess 31c and the nut 37 in the fastened state.

If the crusher is used for a long time, the blade of the cutter 32 becomes dull. In this case, loosen the nut 37 to separate the cutter 32 from the cutter body 31 and turn it to use the blade opposite to the cutter 32. After replacing or replacing, the plate screw 37 and the nut 33 are mounted on the cutter body 31 again.

However, as described above, since there is a space S spaced apart from the nut 37 in the recess 31c, when an external shock is applied to the cutter body 31 mounted on the crush arm during the crushing operation, a circular dotted line is provided. The part indicated by is easily broken so that the fragments fill the space (S). In this case, the nut 37 cannot be loosened, and therefore, the blade opposite to the cutter 32 cannot be used, and the cutter is not smoothly replaced, thereby reducing the service life of the crusher employing such a cutter.

Accordingly, it is an object of the present invention to provide a crusher for cutting steel structures to easily and firmly fasten the cutter and the cutter body while preventing shortening of the life of the crusher.

In order to achieve the above object, the crusher for cutting steel structure of the present invention is the first and second crushing arm which is pivotally coupled to the pivot axis; A plurality of first through-holes, each of which is mounted to the first and second crushing arms and is formed of a second portion communicating with the first portion and the first portion and having a larger diameter than the first portion, First and second cutter bodies, wherein cylindrical bushings are mounted on a wall of the second portion of the first through hole; First and second cutters which are fastened to the first and second cutter bodies, respectively, to cut an object, wherein a plurality of second through holes corresponding to the first portions of the plurality of first through holes are formed; And driving means mounted to rear ends of the first and second crushing arms . Here, in the second portion of the first through hole, a screw passing through the first portion of the first through hole and the second through hole is fastened by a nut, and the diameter of the bushing is not smaller than the diameter of the nut. The bushing is preferably made of an alloy having a hardness of about HRC 40 or more after heat treatment.

Hereinafter, with reference to the accompanying drawings will be described in detail a crusher for cutting steel structure according to a preferred embodiment of the present invention.

1 is a front view of a crusher for cutting a steel structure according to an embodiment of the present invention, Figure 2a is an exploded cross-sectional view taken along the line A-A of Figure 1, Figure 2b is a front view along the line B-B of Figure 2a.

As shown in FIG. 1, the crusher for cutting a steel structure according to an embodiment of the present invention is pivotally coupled to a pivot center axis 10, and opposes the first and second crushing arms 11, 13) is included. The first and second crushing arms 11 and 13 are combined with cutters 12 and 14 to be described later, and first and second cutter bodies 21 and 41 made of an alloy (for example, SKD61) are formed. It is. First and second cutters 12 and 14 for cutting an object are mounted at front ends of the first and second cutter bodies 21 and 41, respectively, and the first and second crushing arms 11 and 13 are mounted. The end of the hydraulic cylinder main body 15 and the hydraulic cylinder piston rod 17 is fixed to the rear end of the crusher, for example. Here, the hydraulic cylinder body 15 coupled to the rear end of the first crushing arm 11 is rotatably coupled around the hydraulic cylinder fixed shaft 16, and coupled to the rear end of the second crushing arm 13. The hydraulic cylinder piston rod 17 is rotatably coupled to the piston fixed shaft 18.

2A and 2B, the fastening structure of the first cutter body 21 and the first cutter 12 mounted on the first crushing arm 11 will be described in detail. 2A and 2B, only the fastening structures of the first cutter body 21 and the first cutter 12 are shown, but the same structure and description are also applied to the fastening of the second cutter body 41 and the second cutter 14. Is self explanatory.

One end of the first cutter body 21 is provided with an accommodating groove 22 for accommodating and mounting the first cutter 12, and a plurality of first through holes 21a are provided on the sidewall of the accommodating groove 22. Formed. Each of the plurality of first through holes 21a includes a first portion 21a-1 and a first portion through which a screw 27, which is a fastening means of the first cutter body 21 and the first cutter 12, passes. The second portion 21a-2 has a larger diameter than the portion 21a-1. The first cutter 12 is provided with a plurality of second through holes 12a through which the fastening screw 27 penetrates and corresponds to the plurality of first through holes 21a.

In the state where the first cutter 12 is attached to the first cutter body 21, both ends of the screw 27 are preferably not protruded in consideration of the cutting operation, and thus the cylindrical body as the screw 27 is formed. It is preferable to use a countersunk screw having a 27a and a pan head 27b. The second through hole 12a is formed at the center of the first cutter 12 and has a first portion 12a- having the same diameter as the first portion 21a-1 of the first through hole 21a. 2) and a pair of second portions 12a-1 having a diameter that increases from the first portion 12a-2 toward both outer sides of the first cutter 12. And a hollow cylindrical bushing supporting the second portion 21a-2 not smaller than the diameter of the hexagon nut 23 on the wall surface of the second portion 21a-2 of the first through hole 21a. (25) is attached.

The bushing 25 supports the second portion 21a-2 while the first through hole 21a when an external impact is applied to the first cutter body 21 mounted on the first crushing arm 11. It is suppressed that the corner C etc. which contact | connect the 2nd part 21a-2 of () are damaged. The bushing 29 has a thickness and strength such that a broken piece of the crusher flows around the nut 23 and does not interfere with the tightening and bearing operation of the nut 23 and the bushing 25 is not damaged by an external impact. Since it is sufficient, the material and thickness of the bushing 25 are not particularly limited. As an example, when the diameter of the bushing 25 is substantially the same as the diameter of the nut 23, there is no gap (SP in FIG. 2B) between the second portion 21a-2 and the nut 23. . Therefore, even if a part of the crusher including the corner C is broken, the removal of the screw 27 from the nut 23 is not affected, so that the work for the use of the opposite blade of the cutter or the cutter replacement operation can proceed smoothly. have. In addition, the bushing 25 may be made of a material which is not damaged by an external impact applied to the first cutter body 21 and may be alleviated or absorbed, and an alloy having a hardness after heat treatment of about HRC40 or more, for example, SCM440. It is preferable to make.

On the other hand, the second through hole 12a (particularly, the second portion 21a-1 of the second through hole 21a), the diameter of the body 27a of the screw 27, the diameter of the nut 23, the bushing ( The relationship between the diameter of 25 and the diameter of the second part 21a-2 of the first through hole 21a is shown in FIG. 2B. As shown in FIG. 2B, the diameter of the body 27a of the screw 27 is substantially the same as the inner diameter of the nut 23 and the outer diameter of the bushing 25 is the second of the first through hole 21a. Equal to the diameter of the portion 21a-2, and the inner diameter of the bushing 25 is larger than the outer diameter of the nut 23. As shown in FIG. 2B, a space SP may be formed between the bushing 25 and the nut 23. The space SP may be formed within a range that is not disturbed by the tightening and loosening of the nut 23. It is possible to adjust the inner diameter of the bushing 25 and the outer diameter of the nut 23 so that there is no SP). As an example, if the inner diameter of the bushing 25 and the outer diameter of the nut 23 are substantially the same as described above, the space SP does not exist.

In the present specification, the present invention has been described based on the accompanying drawings, but various modifications are possible within the scope of the present invention described in the following claims. For example, the crushing arms 11 and 13 may be constituted by a single steel plate or a plurality of steel plates instead of two parallel steel plates, and other motors such as a motor instead of a hydraulic cylinder as a driving means of the crushing arms 11 and 13. It is apparent that the driving means may be used, or the connecting means of each member such as bolts and nuts may be replaced by other conventional connecting means such as rivets.

As described above, since the bushing 25 for supporting the empty space into which the nut is inserted is mounted on the cutter body of the crusher for cutting steel structures according to the present invention, it is possible to suppress the breakage of the cutter body of the crusher and to replace the cutter. Since it becomes easy, shortening of the lifetime of a cutter and a crusher by a broken piece can be prevented.

In addition, since the thread is not formed in the through-hole 21a-1 formed in the cutter body of the crusher according to the present invention, it is easier to manufacture the through-hole 21a-1 that is tightly coupled with the screw.

1 is a front view of a crusher for cutting steel structures according to an embodiment of the present invention.

2A is an exploded cross sectional view taken along the line A-A in FIG. 1;

FIG. 2B is a cross sectional view along line B-B in FIG. 2A; FIG.

3 is a cross-sectional view showing the fastening between the cutter and the cutter body according to the prior art.

Claims (4)

First and second crushing arms pivotally coupled to the pivot central axis; A plurality of first through-holes, each of which is mounted to the first and second crushing arms, and comprises a first portion and a second portion communicating with the first portion and having a larger diameter than the first portion; First and second cutter bodies, wherein cylindrical bushings are mounted on a wall of the second portion of the first through hole; First and second cutters which are fastened to the first and second cutter bodies, respectively, to cut an object, wherein a plurality of second through holes corresponding to the first portions of the plurality of first through holes are formed; And And a drive means mounted to the rear ends of the first and second crushing arms. The screw of claim 1, wherein a screw passing through the first portion of the first through hole and the second portion of the second through hole is fastened by a nut, and the diameter of the bushing is defined by the nut. No less than diameter, crusher for cutting steel structures. The crusher of claim 1, wherein the bushing is made of an alloy having a hardness of about HRC 40 or more after heat treatment. The cutter according to claim 1, wherein the second through hole is formed in a central portion of the cutter and has a first portion having the same diameter as the first portion of the first through hole, and the first through hole from the first portion of the second through hole. Comprising a pair of second parts having a diameter that increases in both outwards, the steel structure cutting crusher.