JP5401133B2 - Demolition attachment - Google Patents

Description

  The present invention provides a pair of jaws (including a combination of a movable jaw and a movable jaw, including a combination of a movable jaw and a fixed jaw) with a blade attached to an attachment portion provided at each facing portion by opening and closing the pair of jaws. The present invention relates to a dismantling attachment that disassembles a building by crossing and shearing steel or the like or crushing concrete.

  A type consisting of a pair of jaws as a dismantling attachment to be attached to the arm of a construction machine (3 types of crushing machine, cutting machine, crushing and cutting combined machine) has a blade on the mounting part provided on the opposite part of each jaw The building is disassembled by attaching and opening and closing the pair of jaws to cross the blades to shear steel or the like or to crush the concrete. At this time, when a thin or thin metal scrap is sandwiched between the blades, a load to be moved from the attachment portion is applied to the blade, and there is a possibility that the fixing bolt for attaching the blade to the attachment portion is damaged. From this, it is desired that the blade is not displaced from the mounting portion in opposition to the load, and that the load does not damage the fixing bolt. In order not to shift the blade, conventionally, there has been a response in which an attachment portion surrounded by a wall on three sides (the front, the rear and the outer side excluding the inner side of the opposing blade) is provided on the jaw, and the blade is regulated by the wall. Yes. However, in this response, the front wall tends to be thin and fragile, and the presence of the front wall makes it impossible to shear in front of the blade and shortens the blade to reduce the shear range of the jaw. There was a problem to make it smaller.

  The dismantling attachment disclosed in Patent Document 1 includes a mounting portion (cutter mounting recess) provided with a plurality of bolt holes and a load receiving portion having a pressure receiving surface, and a blade (cutter) receiving pressure surface of the load receiving portion. And a screw hole corresponding to the bolt hole. The cross-sectional shape of the load receiving portion and the hole of the cutter is a shape (transfer shape) that matches when the cutter is inverted and assembled. The dismantling attachment disclosed in Patent Document 1 is provided with a protrusion (load receiving portion) that is one of the transfer shapes on the attachment portion of the opposing portion, and a recess (hole) that is the other of the corresponding transfer shapes on the blade. By fitting the concavo-convex portions, the blade is not displaced from the mounting portion at the opposing portion, and a load is not applied to the fixing bolt.

JP 2006-219948 A (claims, [0022] to [0026])

  The dismantling attachment disclosed in Patent Document 1 eliminates the possibility that a load is certainly applied to the fixing bolt by forming a portion that receives a load other than the fixing bolt. However, the load concentrates on the convex portion provided in the mounting portion, and there is a risk of damaging the mounting portion around the convex portion. In addition, the shape of the mounting portion and the blade becomes complicated, which makes it difficult to process and raises the problem of increasing the processing cost. Therefore, in order to apply a measure to the dismantling attachment so that the load does not directly damage the fixing bolt without forming a convex portion on which the load is concentrated on the mounting surface of the mounting portion facing or the inner surface of the blade.

As a result of the examination, the blades attached to the attachment portions provided at the opposing portions of the pair of jaws are crossed by opening and closing the pair of jaws, and the steel is sheared or the concrete is crushed to dismantle the building In the dismantling attachment, the jaw side bolt hole provided in the attachment part is provided through the jaw side collar fitting recess opening in the attachment surface of the attachment site, and the blade side bolt hole provided in the blade is provided on the inner surface of the blade. It is provided penetrating from the opening blade side collar fitting recess, and the depth of the jaw side collar fitting recess and the depth of the blade side collar fitting recess are the compressive strength of the material constituting the mounting portion and the material constituting the blade A disassembly attachment was developed in which a collar was fitted into both the jaw side collar fitting recess and the blade side collar fitting recess , and a fixing bolt was inserted through the collar. The inner diameter of the collar (or also called a sleeve) is preferably larger than the outer diameter of the fixing bolt. The collar of the present invention is fitted to both the mounting part and the blade across the boundary where the mounting surface of the mounting part and the inner surface of the blade are in contact with each other, and the load when the blade is displaced with respect to the mounting part is The load is not applied to the fixing bolt. Further, since the collar only needs to have a function of receiving a load toward the fixing bolt, the collar may be loosely fitted to the fixing bolt, or may be externally fitted within a range that does not hinder the fastening of the fixing bolt.

  A specific dismantling attachment can have the following configuration. That is, the jaw side bolt hole is provided to penetrate from the jaw side collar fitting recess opened on the attachment surface of the attachment site, and the blade side bolt hole is penetrated from the blade side collar fitting recess opened to the inner surface of the blade. And a collar is fitted in both the jaw side collar fitting recess and the blade side collar fitting recess. The fixing bolt is inserted from, for example, a jaw side bolt hole, and is screwed into the blade side bolt hole through a collar fitted to both the jaw side collar fitting recess and the blade side collar fitting recess. The fixing bolt may be inserted and screwed from the blade side bolt hole toward the jaw side bolt hole. As long as the fixing bolt can be inserted into the collar, the inner peripheral shape is free and the outer peripheral shape is also free. However, in order to receive a load from an arbitrary circumferential direction equally, the outer peripheral shape is preferably circular in cross section. In this case, in order to avoid a stressed slab of a collar that receives a load, the inner peripheral shape is a circular cross section similar to the outer peripheral shape.

The disassembly attachment of the present invention can prevent the load from directly damaging the fixing bolt by the collar fitted around the fixing bolt. Further, since the fixing bolt is protected by the collar, there is no need to provide a structure for preventing the displacement of the blade with respect to the mounting portion, for example, a convex portion where the load concentrated in the transfer shape of Patent Document 1 is provided. Both the mounting surface of the mounting portion facing each other and the inner surface of the blade can be made flat and brought into close contact with each other. Thereby, while being able to avoid the damage of the blade by the attachment part which does not provide a convex part, or concentration of a load, the effect of reducing the processing cost of an attachment part or a blade is brought about. In addition, it is no longer necessary to surround the blade seen in the past with three walls, and in particular, the front wall can be omitted, allowing shearing at the front end of the blade and making the blade longer than before. Jaw shear range can be increased. Further, the depth of the jaw side collar fitting recess and the depth of the blade side collar fitting recess are set by the inverse ratio of the compressive strength of the material constituting the mounting portion and the compressive strength of the material constituting the blade. The mounting portion and the blade are equally opposed to the load applied from the collar to the jaw side collar fitting concave portion or the blade side collar fitting concave portion, thereby preventing stress uneven distribution. Further, the collar is loosely fitted to the inserted fixing bolt with a gap Δ, so that the fixing bolt can be inserted, for example, from the jaw side bolt hole to the blade side bolt hole without obstructing the collar.

It is a side view showing an example of the dismantling attachment to which this invention is applied. It is the fragmentary sectional view which looked at the blade attached to the opposition site | part of a jaw from the front. It is a side view showing another example of the dismantling attachment to which this invention is applied.

  A mode for carrying out the present invention will be described. As shown in FIG. 1, the disassembly attachment to which the present invention is applied is not different from the conventional configuration in appearance. The disassembly attachment (demolition dedicated machine) of this example has the upper jaw 2 and the lower jaw 3 pivotally attached to the attachment main body 1, the rod of the cylinder 24 pivotally attached to the attachment main body 1 is connected to the upper jaw 2, and the attachment main body 1 The rod of the cylinder 34 pivotally attached to the lower jaw 3 is connected to the lower jaw 3. The upper jaw 2 and the lower jaw 3 are provided with crushing claws 21 and 31 for holding and crushing a concrete block at the tip side, and mounting portions 22 and 32 are formed on the back side in the vicinity of the attachment main body 1. Blades 23 and 33 are attached to each. For distinction in the drawing, the upper jaw is called the upper jaw 2 and the lower jaw is called the lower jaw 3 in FIG. Although both are vertically symmetrical and have the same structure, the symbols are separated for convenience of explanation.

  Since the disassembly attachment of this example applies the present invention, the attachment portions 22 and 32 do not have a front wall among the three walls. That is, the blades 23 and 33 are in contact only with the outer walls 224 and 324 and the rear walls 225 and 325 except that the inner surfaces 231 and 331 are in contact with the mounting surfaces 221 and 321 of the corresponding mounting portions 22 and 32 (see FIG. 2). Not. Conventionally, the front wall is provided so that the blades 23 and 33 do not move forward due to the applied load. However, in the present invention, the blades 23 and 33 are attached to the mounting portions 22 and 32 by the fixing bolt 5. Since it can be firmly fixed, the front wall can be omitted. For this reason, the blades 23 and 33 of this example are attached so that the front ends are exposed to the respective attachment portions 22 and 32, and a flange projecting inward is formed inside the front end so as not to let the steel material escape. Thus, the entire blade span is made available for shearing.

  The attachment relationship of the blades 23 and 33 with respect to the attachment portions 22 and 32 is similar to that of the prior art, but as shown in FIG. 2, the jaw side collar fitting recesses 223 and 323 communicating with the jaw side bolt holes 222 and 322 are provided as attachment portions 22. 32, and the blade side collar fitting recesses 223 and 323 communicating with the blade side bolt holes 232 and 332 are opened on the inner surfaces 231 and 331 of the blades 23 and 33, respectively. When the inner surfaces 231 and 331 of the 33 are brought into contact with each other, the collar 4 into which the fixing bolt 5 can be inserted is fitted into the space formed by the jaw side collar fitting recesses 223 and 323 and the blade side collar fitting recesses 223 and 323. Is different from the conventional one. That is, the mounting portions 22 and 32 and the blades 23 and 33 are not provided with convex portions on the mounting surfaces 221 and 321 and the inner surfaces 231 and 331, respectively, and the mounting surfaces 221 and 321 and the inner surfaces 231 and 331 can be brought into close contact with each other. In this example, the fixing bolt 5 is inserted into the jaw-side bolt hole 222 from the back side of the mounting portion 22, and the collar 4 is passed through and the fixing bolt 5 is screwed into the blade-side bolt hole 232 of the blade 23 (in FIG. 2). Upper jaw 2).

  The collar 4 in this example has a short pipe shape with a circular cross section, and receives the load when the blades 23 and 33 are displaced with respect to the mounting portions 22 and 32 before the blades 23 and 33, and applies the load to the fixing bolt 5. In order not to add, a material having high compressive strength (for example, bearing steel) is used, and the thickness (radius difference between the inner and outer circumferences) is set to 2 mm to 5 mm. Since the collar 4 is closely fitted in the jaw side collar fitting recesses 223 and 323 and the blade side collar fitting recesses 223 and 323, respectively, the jaw side collar fitting recesses 223 and 323 and the blade side collar fitting recesses 223 and 323 are formed of the collar 4. It is a hollow with a circular cross section equal to the outer peripheral shape. On the other hand, since the collar 4 only needs to have a function of receiving a load toward the fixing bolt 5, the collar 4 is loosely fitted to the fixing bolt, and the inner diameter of the inner peripheral shape is made larger than the outer diameter of the fixing bolt 5. ing. That is, in this example, the inner peripheral shape of the collar 4 is loosely fitted with a gap Δ to the fixing bolt 5 to be inserted. Accordingly, the fixing bolt 5 can be inserted from the jaw side bolt hole 322 into the blade side bolt hole 332 without disturbing the collar 4 (see the lower jaw 3 in FIG. 2). As a guide, the gap Δ is 0 mm (when the inner circumference is in contact with the thread of the fixing bolt) to 2 mm.

  The collar 4 is fitted to the mounting portions 22 and 32 and the blades 23 and 33 across the boundary where the mounting surfaces 221 and 321 of the mounting portions 22 and 32 are in contact with the inner surfaces 231 and 331 of the blades 23 and 33. Since the shearing force is received by the blades 23 and 33 that are about to be displaced with respect to the attachment portions 22 and 32, it is only necessary to scoop the boundary, and the fitting portions 22 and 32 or the blades 23 and 33 are respectively fitted. The depth (= depth d1 of the jaw side collar fitting recess 323 and depth d2 of the blade side collar fitting recess 323) can be freely set to 3 mm or more. However, the mounting portions 22 and 32 and the blades 23 and 33 equally oppose the load applied from the collar 4 to the jaw side collar fitting recesses 223 and 323 or the blade side collar fitting recesses 223 and 323 to prevent stress uneven distribution. Therefore, the depth d1 of the jaw side collar fitting recess 323 and the depth d2 of the blade side collar fitting recess 323 are determined by the compressive strength of the material constituting the mounting portions 22 and 32 and the material constituting the blades 23 and 33. It is good to set by the inverse ratio to the compressive strength. In this example, assuming that the compressive strength of the material constituting the attachment portions 22 and 32 is equal to the compressive strength of the material constituting the blades 23 and 33, the depth d1 of the jaw side collar fitting recess 323 and the blade side collar fitting The depth d2 of the joint recess 323 is made equal.

  In addition, the present invention can bring about an effect of extending the life of the dismantling attachment. For example, in the dismantling attachment (combining machine for crushing and cutting) shown in FIG. 3, the upper jaw 7 and the lower jaw 8 are axially attached to the attachment body 6, and the rod of the cylinder 74 that is also axially attached to the attachment body 6 is connected to the upper jaw 7. The rod 84 of the cylinder 84 pivotally attached to the attachment body 6 is connected to the lower jaw 8, and the front blades 71 and 81 have not only the outer walls 724 and 824 but also the front walls 726 and 826 as in the prior art. Parts 72 and 82 are provided. For distinction in the drawing, the upper jaw is called the upper jaw 7 and the lower jaw is called the lower jaw 8 in FIG. Although both are vertically symmetrical and have the same structure, the symbols are separated for convenience of explanation.

  According to the present invention, the front walls 726 and 826 are not necessary for the mounting portions 72 and 82, but in order to maintain as much as possible the component shape compatibility with the conventional equivalents, as in the dismantling attachment shown in FIG. In some cases, the front walls 726,826 may be left in the portions 72,82. However, if the present invention is applied, the front blades 71 and 81 do not move, and even the thin front walls 726 and 826 are not easily damaged. Since the mounting parts 72 and 82, front blades 71 and 81, and rear blades 73 and 83 are simply provided with a jaw side collar fitting recess and a blade side collar fitting recess (see Fig. 2), existing disassembly attachments In addition, the application of the present invention is easy. As described above, since the front walls 726 and 826 are hardly damaged, not only the disassembly attachment to which the present invention is applied from the beginning but also the effect of extending the life of the existing disassembly attachment is brought about.

1 Attachment body 2 Upper jaw
22 Mounting part
221 Mounting surface
222 Jaw bolt hole
223 jaw side collar fitting recess
23 blades
231 Inside
232 Blade side bolt hole
233 Blade side collar fitting recess 3 Lower jaw
32 Mounting part
321 Mounting surface
322 Jaw bolt hole
323 jaw side collar fitting recess
33 blades
331 Inside
332 Blade side bolt hole
333 Blade side collar fitting recess 4 Collar 5 Fixing bolt

Claims (2)

In the dismantling attachment that disassembles the building by crossing the blades attached to the attachment parts provided at the opposing parts of the pair of jaws by opening and closing the pair of jaws, shearing steel materials, etc. or crushing the concrete ,
The jaw side bolt hole provided in the attachment part is provided through the jaw side collar fitting recess opening in the attachment surface of the attachment part, and the blade side bolt hole provided in the blade is provided in the blade side collar opening in the inner surface of the blade. Provided through the fitting recess,
The depth of the jaw side collar fitting recess and the depth of the blade side collar fitting recess are set by the inverse ratio of the compressive strength of the material constituting the mounting portion and the compressive strength of the material constituting the blade,
A disassembly attachment characterized in that a collar is fitted into both the jaw side collar fitting recess and the blade side collar fitting recess , and a fixing bolt is inserted through the collar. The disassembly attachment according to claim 1 , wherein the collar has an inner diameter larger than an outer diameter of the fixing bolt .

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