Mounting structure and method for the tip claws of a hydraulic crushing machine for demolishing concrete structures.

Abstract

The tip claws of a hydraulic crushing machine (a so-called large-scale crushing machine) used for demolishing concrete structures can be easily attached and detached without requiring welding. [Solution] In a hydraulic crusher for demolishing concrete structures, a pair of tip claws are detachably provided on the tip sides of each of the pair of main arms of the hydraulic crusher, and the tip sides of the pair of main arms are opened and closed by a hydraulic cylinder to crush the object to be crushed, a tip claw integrated tooth is provided, on which the tip claws are integrally formed and arranged, and the tip claw integrated tooth, which has the inside formed to a corresponding shape, is fitted over the corresponding part of the main arm which is formed to a predetermined shape, and is detachably fixed using fixing means.

Description

Technical Field

[0001] The present invention relates to an attachment structure and method of a detachable tip claw suitable for use in a hydraulic crusher for demolishing concrete structures.

Background Art

[0002] Conventionally, as a method of attaching tip claws (at the time of new product and repair) of a hydraulic crusher (so-called large breaker) for demolishing concrete structures, tip claws and middle claws are respectively attached to each arm (both left and right sides) of the crusher body by welding work (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a conventional attachment method, in order to prevent cracks and the like due to heat influence during welding, it is necessary to warm the arms and claw materials of the crusher body to an appropriate temperature before and after construction, and after construction, strict temperature control such as slow cooling to avoid rapid cooling and penetration depth flaw testing (PT inspection) are required, which requires a corresponding amount of time and equipment and also requires a high level of skill from the operator. However, in recent years, the number of skilled workers in welding work has been significantly decreasing, making it difficult to carry out the above work, and this trend of shortage of workers is particularly prominent overseas, and it is an undeniable fact that the difficulty of carrying out claw material welding work overseas is increasing.

[0005] Furthermore, conventionally, buildings are generally demolished using a so-called large crusher as an attachment (primary crushing), and then the demolished concrete blocks are further crushed into smaller pieces using a so-called small crusher and transported to a processing company (secondary crushing). In this case, with a crusher that has one fixed arm and the other movable arm (a so-called small crusher), the reaction force received from the object being crushed is relatively small, so there is little wear or damage to the claws fixed to the tip of the arm, and the frequency of claw replacement is not that high, so the problem is small. However, with a hydraulic crusher for demolishing concrete structures (a so-called large crusher) that is used to demolish concrete structures erected from the ground, such as buildings, the tip claws are provided opposite each other at the ends of a pair of arms, and the tip of the pair of arms is opened and closed by a hydraulic cylinder to crush the object being crushed, reinforced concrete columns and the like are crushed in the air, so the wear and damage to the claws at the tip of the arm is great, and the frequency of claw replacement is high, so the shortage of skilled welders mentioned above is a serious problem.

[0006] Furthermore, since welding is performed using a gas burner, the method of attaching and replacing claws, which requires frequent welding, cannot be said to meet the demands of a so-called deoxygenated society.

[0007] This invention has been made in view of the above-mentioned problems, and its purpose is to provide a mounting structure and method that allows for easy attachment and detachment of the claw material, particularly the tip claw, of a hydraulic crushing machine (so-called large crushing machine) for demolishing concrete structures without requiring welding. [Means for solving the problem]

[0008] To solve these problems, the inventors diligently continued their research and development, and as a result, conceived of providing a tooth with an integrated tip that can be easily attached and detached without the need for welding. They found that in a hydraulic crusher for demolishing concrete structures, a tooth with an integrated tip, molded to a similar shape, can be fitted onto the arm of the main body, which is molded to a predetermined shape, and fixed in a detachable manner, thereby enabling easy attachment and detachment without the need for welding.

[0009] In other words, in order to achieve the above objective, the mounting structure for the tip claws in the hydraulic crusher for demolishing concrete structures of the present invention is characterized in that, in a hydraulic crusher for demolishing concrete structures in which at least one pair of tip claws are detachably provided facing each other on the tip side of a pair of main arms of the hydraulic crusher, and the tip side of the pair of main arms is opened and closed by a hydraulic cylinder to crush the object to be crushed, a tip claw integrated tooth is provided on which the tip claws are integrally formed and arranged, and the tip claw integrated tooth, which has the inside formed to a corresponding shape, is fitted over the corresponding part of the main arm which is formed to a predetermined shape, and is detachably fixed using fixing means.

[0010] According to the mounting structure of the present invention, even when used in a hydraulic crushing machine for demolishing concrete structures (a so-called large crushing machine), the tip claws will not easily break off even when subjected to strong reaction forces from reinforced concrete, etc.

[0011] Furthermore, since welding of claw materials using a gas burner becomes unnecessary, carbon dioxide emissions from the work can be reduced, thus meeting the demands of an era of decarbonization.

[0012] Furthermore, the tip-claw integrated tooth may also have a wedge integrally formed and disposed in addition to the tip claw. It is also preferable that the tip-claw integrated tooth further has an intermediate claw integrally formed and disposed between the tip claw and the wedge at a predetermined distance or with the wedge in between.

[0013] Furthermore, as a means of fixing the tip-claw-integrated tooth to the main body arm, it is preferable to use two pins, and to prevent each pin from falling out, to secure it to the end plate and bolt from the opposite side. However, more or fewer pins may be used.

[0014] Furthermore, as a modification of the present invention, the corresponding portion of the main body arm may be molded to have a step, and the inside of the tip claw-integrated tooth may also be molded to a shape corresponding to the step.

[0015] Furthermore, the present invention relates to a method for attaching the tip claws in a hydraulic crusher for demolishing concrete structures, wherein at least one pair of tip claws are detachably provided facing each other on the tip side of a pair of main arms of the hydraulic crusher, and the object to be crushed is crushed by opening and closing the tip sides of the pair of main arms with a hydraulic cylinder, and the method for attaching the tip claws in a hydraulic crusher for demolishing concrete structures comprises the steps of: shaping the corresponding parts of the main arms into a predetermined shape; providing a tip claw integrated tooth on which the tip claws are integrally formed and arranged, and shaping the inside of the tip claw integrated tooth into a corresponding shape; fitting the tip claw integrated tooth onto the corresponding parts of the main arms; and fixing the fitted tip claw integrated tooth to the main arms detachably using fixing means. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view of a hydraulic crusher for demolishing concrete structures to which the tip claw mounting structure of an embodiment of the present invention is applied. [Figure 2] This is a perspective view showing the mounting structure of the tip claw according to an embodiment of the present invention in comparison with a conventional mounting structure of the tip claw, where (A) is a perspective view showing the mounting structure of the tip claw according to an embodiment of the present invention, and (B) is a perspective view showing a conventional mounting structure of the tip claw. [Figure 3] This figure shows an integrated tip-and-middle-jaw tooth according to an embodiment of the present invention, where (A) is a perspective view thereof and (B) is a cross-sectional view thereof. [Figure 4] This is a side view showing one side of the main body arm of a hydraulic crushing machine for demolishing concrete structures, before attaching the integrated tip and middle tooth of an embodiment of the present invention. [Figure 5] This is a partially cutaway cross-sectional view showing the main part of the integrated tip claw and middle claw tooth in an embodiment of the present invention, when it is attached to the main arm (one side) of a hydraulic crusher for demolishing concrete structures. [Modes for carrying out the invention]

[0017] Hereinafter, with reference to Figures 1 to 5, the mounting structure of the tip claws in a hydraulic crusher for demolishing concrete structures according to an embodiment of the present invention will be described. Figure 1 is a perspective view of a hydraulic crusher for demolishing concrete structures to which the mounting structure of the tip claws according to an embodiment of the present invention is applied. As shown in Figure 1, the mounting structure of the tip claws according to an embodiment of the present invention is applied to a hydraulic crusher 10, which is a so-called large-scale crusher. This hydraulic crusher 10 generally comprises a pair of main body arms 12, two hydraulic cylinders 14, a work bracket 16, and an arm support 18. The pair of main body arms 12 are formed in a substantially triangular shape and arranged symmetrically. The inner rear end of each is pivotally supported by the arm support 18, and the outer rear end is further pivotally supported by the outer cylinder of the two hydraulic cylinders 14 attached to the arm support 18. Furthermore, each main body arm 12 of the hydraulic crusher 10 has a tip claw 22a positioned opposite to the tip of the arm at its outermost end for crushing objects to be crushed (not shown), such as concrete structures. Near the pivot support of the arm support 18, a shearing blade 26a for cutting reinforcing bars, steel frames, etc., is positioned opposite to the tip claw 22a and the shearing blade 26a. In addition, a crushing blade (wedge) 22b for biting into and crushing the object to be crushed is positioned opposite to the tip claw 22a and the shearing blade 26a. A crushing blade (wedge) 22b for biting into and crushing the object to be crushed is positioned opposite to the tip claw 22a and the shearing blade 22c. The hydraulic crusher 10 configured in this way dismantles concrete structures, etc., by opening and closing the tip ends of a pair of main body arms 12 with two hydraulic cylinders 14 to crush the object to be crushed.

[0018] In this embodiment of the present invention, as shown in Figure 1, a pair of tip-claw integrated teeth 22, each having at least a tip claw 22a integrally formed and disposed thereon, are provided. Each tip-claw integrated tooth 22, with its inner surface molded to a corresponding shape, is fitted onto the corresponding portion of each main body arm 12, which is molded to a predetermined shape, and is configured to be detachably fixed using fixing means. Furthermore, as shown in Figures 2(A) and 3(A)(B) described later, each tip-claw integrated tooth 22 also has a wedge 22b integrally formed and disposed thereon in addition to the tip claw 22a, and a middle claw 22c is also integrally formed and disposed thereon with the wedge 22b sandwiched between the tip claw 22a and the wedge 22b. Therefore, in the mounting structure of this embodiment, the tip-claw integrated tooth 22 is configured as a tip-claw / middle claw (and wedge) integrated tooth, and will be referred to as the tip-claw / middle claw integrated tooth 22 hereafter. Furthermore, in order to form the main arm 12 and the tip-claw-integrated tooth 22 into the predetermined shape, machining may be performed, or it may be possible to form them without machining by using precision casting or the like. Also, the tip-claw-integrated tooth 22 only needs to have at least the tip claw 22a integrally formed and arranged, and for example, it may be configured as a tooth without a middle claw.

[0019] The mounting structure of the tip claw according to an embodiment of the present invention will be described in more detail with reference to Figures 2 to 5 in addition to Figure 1. Figure 2 is a perspective view showing the mounting structure of the tip claw according to an embodiment of the present invention in comparison with a conventional mounting structure of a tip claw, where (A) is a perspective view showing the mounting structure of the tip claw according to an embodiment of the present invention, and (B) is a perspective view showing a conventional mounting structure of a tip claw. That is, in the conventional mounting structure of a tip claw, as shown in Figure 2(B), welding surfaces 32f are provided at the tip and center of a pair of main body arms 32 [only one main body arm 32 is shown in Figure 2(B)], and the bottom surfaces of the substantially pyramidal tip claws 32a and middle claws 32c are welded to these welding surfaces 32f, respectively, thereby fixing the tip claws 32a and middle claws 32c to the main body arms 32. Even when a crushing blade (wedge) is provided, the crushing blade (wedge) is often not welded, but rather molded to the corresponding part of the main body arm 32 and provided integrally with the main body arm 32. As mentioned above, conventional mounting structures for tip claws 32a and middle claws 32c require, during welding, to prevent cracking due to heat effects, the claw materials used for the main arm 32, tip claws 32a, and middle claws 32c must be heated to an appropriate temperature before and after construction. Furthermore, after construction, strict temperature control, such as slow cooling to avoid rapid cooling, and penetrating deep scratch testing (PT testing) must be performed. This requires considerable time and equipment, as well as a high level of skill from the workers. In contrast, the mounting structure of the tip claw of this embodiment is provided as shown in Figure 2(A), in which the tip claw 22a, (wedge 22b), and middle claw 22c are integrally formed and arranged, and a tip claw / middle claw integrated tooth 22 is provided [Figure 2(A) only shows the tip claw / middle claw integrated tooth 22 on one side of the main body arm 12] is provided, and the tip claw / middle claw integrated tooth 22, which has the inside formed to the corresponding shape, is fitted over the corresponding part of the main body arm 12 which has been formed to a predetermined shape, and is configured to be fixed detachably using fixing means. In the mounting structure of this embodiment, the fixing means is as shown in Figures 2(A) and 3(A)(B), the tip claw / middle claw integrated tooth 2 Two through holes are provided at corresponding positions 12Z of the main body arm 12 and the two-tooth main body 22Z of 2, respectively. Two pins 22d are inserted into these through holes, and each pin 22d is fixed from the opposite side by an end plate 22f and a bolt 22h so as not to fall off. However, it is of course possible that the number of through holes and the number of pins may be more or less than two.

[0020] Figure 3 shows an integrated tip-and-middle-claw tooth according to an embodiment of the present invention, where (A) is a perspective view and (B) is a cross-sectional view thereof. Figure 4 is a side view of one side of the main body arm of a hydraulic crusher for demolishing concrete structures before attaching the integrated tip-and-middle-claw tooth according to an embodiment of the present invention, and Figure 5 is a partially cutaway cross-sectional view showing the main part of the state in which the integrated tip-and-middle-claw tooth according to an embodiment of the present invention is attached to one side of the main body arm of a hydraulic crusher for demolishing concrete structures. As shown in Figures 3(A) and (B), the integrated tip-and-middle-claw tooth 22 of this embodiment [only the integrated tip-and-middle-claw tooth 22 on one side of the main body arm 12 is shown in Figures 3(A) and (B)] has a tip-and-middle-claw on the tip side of the tooth body 22Z and a middle-claw 22c which is slightly lower in height than the tip-and-middle-claw on the opposite side (towards the center of the arm body), which are continuously formed and arranged from the same material with a wedge 22b in between. The lower part of the tip claw 22a and the lower part of the middle claw 22c of the tooth body 22Z have through holes 22m and 22n, respectively, for fixing to the main arm 12. The upper end of the tip claw 22a has a ridge 22ar perpendicular to the length direction of the tooth body 22Z, and the upper end of the middle claw 22c has a ridge 22cr along the length direction of the tooth body 22Z. The wedge 22b is formed in a curved recessed shape between the tip claw 22a and the middle claw 22c, and the upper end of this wedge 22b has a ridge 22br along the length direction of the tooth body 22Z that is continuous with the ridge 22cr of the middle claw 22c. Due to this ridge 22br, the wedge 22b functions as a crushing blade that bites into the object to be crushed when the pair of main arms 12 are closed. Here, the inner portion 22U of the integrated tip-and-middle-jaw tooth 22, which roughly corresponds to the tooth body 22Z, is molded into a corresponding shape (cavity) so that it can be fitted over the corresponding portion 12Z of the main arm 12 (see Figures 4 and 5), as shown in Figure 3(B). On the other hand, the corresponding portion 12Z of the main arm 12 is molded into a predetermined shape corresponding to the inner portion 22U of the integrated tip-and-middle-jaw tooth 22, as shown in Figure 4. Furthermore, as shown in Figure 4, through holes 12m and 12n are formed at the corresponding portion 12Z of the main arm 12 at positions corresponding to the through holes 22m and 22n of the tooth body 22Z.Due to the corresponding part 12Z of the main body arm 12 and the tip claw and middle claw integrated tool 22 being formed as described above, as shown in FIGS. 2(A) and 5, the tip claw and middle claw integrated tool 22 can be placed over and inserted into the corresponding part 12Z of the main body arm 12. Then, the two pins 22d are respectively inserted into the through holes 22m and 12m, and through holes 22n and 12n, and each pin 22d is fixed from the opposite side by the end plate 22f and the bolt 22h so as not to fall off. Thereby, as shown in FIG. 5, the tip claw and middle claw integrated tool 22 can be firmly fixed to the corresponding part 12Z of the main body arm 12.

[0021] According to the mounting structure of the present invention, even when used in a hydraulic crusher for demolishing concrete structures (so-called large cutters) 10, the tip claws 22a and middle claws 22c are not likely to be easily dislodged even when receiving a strong reaction force from reinforced concrete or the like. Also, when manufacturing and delivering a new hydraulic crusher 10 for demolishing concrete structures (at the time of new product) or when replacing the tip claws and / or middle claws when it is worn out after being delivered to a demolition contractor and used for demolition (at the time of replacement), the welding operation of the tip claws 22a and middle claws 22c using a gas burner becomes unnecessary. Thus, the operation of discharging carbon dioxide can be reduced, and it becomes possible to meet the requirements of the times for a deoxygenated society.

[0022] In addition, in the mounting structure of the present embodiment, as shown in FIGS. 2 to 5, as the above fixing means, through holes are provided in the tool body 22Z of the tip claw and middle claw integrated tool 22 and the corresponding part 12Z of the main body arm 12 respectively, and the pin 22d is inserted into these through holes. Each pin 22d is fixed from the opposite side by the end plate 22f and the bolt 22h so as not to fall off. However, other fixing means other than through holes and pins may also be used.

[0023] Although not shown in the figures, the corresponding parts of the pair of main body arms 12 may be molded to have steps, and the inside of the tip-claw integrated tooth may also be molded to correspond to these steps. That is, as shown in Figure 5, the inside of the tooth body 22Z of the tip-claw / middle-claw integrated tooth 22 fits into the corresponding part 12Z of the main body arm 12. As a modification, this corresponding part 12Z may be molded to have a step that is narrower at the top and wider at the bottom (this step is not shown in Figure 5), and the inside of the tooth body 22Z of the tip-claw / middle-claw integrated tooth 22 may also be molded to correspond to this step, so that the two can be fitted together and fixed. By providing such steps, the surface area that receives reaction forces due to crushing (pressure receiving surface) increases, so it is possible to increase the strength of the tip-claw / middle-claw integrated tooth.

[0024] Next, a method for attaching the tip claws in a hydraulic crusher for demolishing concrete structures, as an embodiment of the present invention, will be described. The attachment method of this embodiment is also applied to a so-called large crusher, a hydraulic crusher 10 shown in Figure 1, in which a pair of tip claws are detachably attached to the tip of each of the pair of main body arms 12, facing each other, and two hydraulic cylinders 14 open and close the tip of the pair of main body arms 12 to crush and demolish concrete structures and other objects to be crushed (not shown). The attachment method of this embodiment is shown in detail in Figures 1 to 5, but in general terms, first, the corresponding parts of each main body arm 12 of the hydraulic crusher 10 are formed into a predetermined shape. In addition, a tip claw integrated tooth 22, on which at least a tip claw 22a is integrally formed and arranged, is provided, and the inside of the tip claw integrated tooth 22 is formed into a corresponding shape. Then, the integrated claw-tip teeth 22 are fitted onto the corresponding parts of each main body arm 12, and the fitted integrated claw-tip teeth 22 are detachably fixed to the main body arm 12 using a fixing means.

[0025] Furthermore, in the mounting method of this embodiment, the tip-claw integrated tooth 22 also has a wedge 22b integrally formed and disposed in conjunction with the tip claw 22a, in addition to the tip claw 22a. In addition, the tip-claw integrated tooth 22 also has a middle claw 22c integrally formed and disposed in conjunction with the wedge 22b, with the wedge 22b sandwiched between the tip claw 22a and the middle claw 22c. Therefore, in the mounting method of this embodiment as well, the tip-claw integrated tooth 22 is configured as a tip-claw / middle claw (and wedge) integrated tooth.

[0026] According to the mounting method of the present invention, even when used in a hydraulic crusher (so-called large crusher) 10 for demolishing concrete structures, the tip claws 22a and middle claws 22c will not easily break off even when subjected to strong reaction forces from reinforced concrete, etc. Furthermore, when manufacturing and delivering a new hydraulic crusher 10 for demolishing concrete structures (when new) or when replacing the tip claws and / or middle claws after they have worn out from use in demolition by a demolition company (when replaced), welding work on the tip claws 22a and middle claws 22c using a gas burner becomes unnecessary, thus reducing the amount of work that emits carbon dioxide and meeting the demands of an era of decarbonization.

[0027] In this embodiment, the mounting method, as shown in Figures 2 to 5, involves providing through holes in the tooth body 22Z of the tip claw / middle claw integrated tooth 22 and the corresponding location 12Z of the main body arm 12, inserting pins 22d through these through holes, and securing each pin 22d from the opposite side with an end plate 22f and a bolt 22h to prevent it from falling out. However, other fixing means may also be used. Furthermore, the corresponding locations of the pair of main body arms 12 may be molded to have steps, and the inside of the tip claw integrated tooth may also be molded to a shape corresponding to these steps. [Explanation of symbols]

[0028] 10 Hydraulic crusher, 12 Main arm, 12Z Compatible area, 12m,12n Through hole, 14 Hydraulic cylinder, 16 Working bracket, 18 Arm support, 22 Integrated tip and middle tooth, 22a Tip tooth, 22b Crushing blade (wedge), 22c Middle tooth, 22U Inner part, 22m,22n Through hole, 22d Pin, 22f End plate, 22h Bolt, 26a Shear blade

Claims

1. In a hydraulic crusher for demolishing concrete structures, at least one pair of end claws are detachably provided on the tip sides of each of a pair of main arms, facing each other, and a hydraulic cylinder is used to open and close the tip sides of the pair of main arms to crush the object to be crushed, the mounting structure for the end claws in a hydraulic crusher for demolishing concrete structures is characterized by providing an integrated end claw tooth on which the end claws are integrally formed and disposed, and fitting the integrated end claw tooth, which has the inside molded to a corresponding shape, onto a corresponding part of the main arm that is molded to a predetermined shape, and fixing it detachably using fixing means.

2. The mounting structure for the tip claw in a hydraulic crusher for demolishing concrete structures, characterized in that, in addition to the tip claw, a wedge is also integrally formed and disposed on the tip claw-integrated tooth according to claim 1.

3. The mounting structure for the tip claw according to claim 1 or 2, wherein the tip claw integrated tooth is further characterized in that an intermediate claw is integrally formed and disposed between it and the tip claw at a predetermined distance or with the wedge in between, in a mounting structure for the tip claw in a hydraulic crusher for demolishing concrete structures.

4. A mounting structure for a tip claw in a hydraulic crusher for demolishing concrete structures, according to any one of claims 1 to 3, characterized in that the fixing means uses two pins, and each pin is fixed from the opposite side by an end plate and a bolt so as not to fall out.

5. A mounting structure for a tip claw in a hydraulic crusher for demolishing concrete structures, characterized in that the corresponding portion of the main body arm is molded to have a step, and the inside of the tip claw integrated tooth is also molded to a shape corresponding to the step.

6. A method for attaching tip claws in a hydraulic crusher for demolishing concrete structures, wherein at least one pair of tip claws are detachably provided on the tip side of each of a pair of main arms of the hydraulic crusher, and the tip side of the pair of main arms is opened and closed by a hydraulic cylinder to crush the object to be crushed, the method comprising: a step of shaping the corresponding part of the main arm into a predetermined shape; a step of providing a tip claw integrated tooth on which the tip claw is integrally formed and disposed, and shaping the inside of the tip claw integrated tooth into a corresponding shape; a step of fitting the tip claw integrated tooth over the corresponding part of the main arm; and a step of fixing the fitted tip claw integrated tooth to the main arm detachably using a fixing means.

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