JPH041146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a claw mounting structure for a crusher that crushes and destroys concrete, stone, etc. of structures.

BACKGROUND ART FIG. 2 is a plan view of a crusher for crushing and crushing concrete, stones, etc. of structures. The arms 4, 4' are rotated around the axes P, P' by the hydraulic cylinder 3, and the claws 5,
The concrete or stone is clamped by the hydraulic cylinder 5', and the concrete or stone is crushed under pressure by the force of the hydraulic cylinder.

However, if you use this crusher for a long time, the claws 5,
5' becomes worn out and becomes unusable. Therefore, the claws 5, 5' are detachably fixed to the arms 4, 4'.

FIG. 3 is a diagram showing a conventional mounting structure in which a claw is fixed to an arm. Reference numeral 4 is an arm of a crusher, and a claw pedestal 6 is welded 10 to the tip of the arm 4 and fixed. A claw 5 is fitted into a hole in the claw pedestal 6 and is fixed to the claw pedestal 6 with a plurality of bolts 8 and also to the arm 4 with bolts 7. Note that, in order to make the structure easier to understand, FIG. 3 shows a diagram in which the claw pedestal 6 is cut at the center point.

The claws of conventional crushers are attached by the above-mentioned mounting structure, and when concrete or stone is crushed by the claws 5 attached in this way,
Forces are applied to the claw 5 in various directions, and these forces are strong, and the fitting between the claw 5 and the claw pedestal 6 usually has some looseness, so the bolt 7 alone can eliminate that looseness. If it is not possible to prevent the nail from sticking, and if use continues, the part of the nail base 6 shown in FIG. 3a will be destroyed due to the rattling of the nail 5. In addition, since the strong force applied to the claw 5 is unevenly applied, the bolt 8 that fixes the claw 5 to the claw pedestal 6 may come off, or cracks may occur in the area of the claw 5 that is fixed by the bolt 8, as shown in FIG. 3b. Occurs. Furthermore, as the pawl 5 wears out, the bolt 8 to which the pawl is fixed also collapses, making it impossible to remove the bolt 8. In such a case, conventionally, the bolt 8 was cut with oxygen gas, the pawl 5 was removed, and the pawl 5 was replaced.

Problems to be Solved by the Invention The object of the present invention is to improve the above-mentioned drawbacks of the conventional technology, to facilitate attachment and detachment of the claws of a crusher, and to reduce damage to the claws and the claw pedestal.

Means for Solving the Problem A claw pedestal having a tapered hole is fixed to the arm of the crusher, and a tapered mounting portion is made of a metal that is somewhat softer than the tapered portion of the claw pedestal. A claw having a shape is provided, and a mounting portion of the claw is fitted into a hole of the claw pedestal and fixed thereto.

Function: Since the claw mounting part is made of a metal that is a little softer than the tapered part of the claw base, the tapered mounting part blends well with the hole in the claw base and fits in a tight state. , Even if forces are applied to the nail from various directions, the nail pedestal will receive the force as a whole,
The claws and the claw pedestal are less likely to be damaged because the force is not applied locally or intensively.

In the event that excessive force is applied to the claw, the claw, which is softer than the hole in the claw pedestal, will deform and break first and absorb the excessive force. As a result, damage to parts that are difficult or expensive to replace is prevented.

Embodiment FIG. 1 is a diagram showing an embodiment of the present invention, where 4 is an arm of a crusher similar to FIGS. 2 and 3, and 11 is a claw pedestal, which is fixed to the arm 4 by welding 20 or the like. ing. The claw pedestal 11 has a tapered hole 12 whose diameter decreases toward the joint surface of the arm 4.

Reference numeral 13 denotes a claw, and the claw 13 has a tapered mounting portion 1 that closely fits into the tapered hole 12 of the claw pedestal 11.
4, and when the mounting part 14 is fitted into the hole 12 of the claw pedestal and installed as shown in FIG. 1, a small space is formed between the tip of the mounting part 14 and the arm 4. The hole 12 and the mounting portion 14 are tapered so as to be securely fitted. Also, nail 1
The attachment part 14 in 3 is somewhat softer than the hole 12 of the nail pedestal 11, and key grooves 17 and 18 are provided in the hole 12 and a part of the tapered surface of the attachment part 14, respectively. A key 19 is inserted between 18 and prevents the claw 13 from rotating.

Further, the claw 13 is fixed to the arm 4 with a bolt 21. Note that 15 is a flange provided on the claw 13, and a gap 22 of the same size as the space 16 is provided between the flange portion 15 and the claw pedestal 11. Alternatively, a claw without the flange 15 may be used.

With the structure described above, when attaching the claw 13 to the arm 4, the key 19 is inserted into the key groove 18 of the attachment part 14 of the claw 13, and the key 19 is inserted into the key groove 17 of the claw base 11. Attachment part 1 of claw 13 along
4 into the hole 12 and fit together. Next, bolt 21
Attachment of the claw is completed by simply fixing the arm 4 and the claw 13.

Next, to remove the pawl 13, remove the bolt 21, insert a rod with a diameter slightly smaller than the diameter of the bolt 21 into the bolt mounting hole of the pawl, and strike the rod with a hammer or the like to knock out the pawl 13. Also,
In case the claw 13 bites into the claw pedestal 11 and cannot be easily removed, protrusions 23 and 23' are provided on the bolt attachment part of the arm 4 as shown in FIG. diameter lot 2
4, a rectangular nut 25 is provided to be screwed into the screw, and the short side of the rectangular nut 25 is passed between the protrusions 23 and 23', and the rectangular nut 25 is rotated. The long sides of the projections 23, 23' as shown in FIG.
and a rectangular nut 25 (see Fig. 5),
Rotate the rod 24 so that the tip of the rod 24 is located at the claw 1.
The bolt 24 may be tightened until it comes into pressure contact with the bolt hole 3, and then the rod 24 may be struck with a hammer or the like to knock out the pawl 13.

With the claw 13 attached as described above,
When crushing concrete or stone to destroy it, enormous forces are applied to the claws 13 from various directions;
Since the claw pedestal 11 and the claw are closely fitted with each other by fitting well into the tapered hole 12 and the slightly softer tapered claw attachment part 14, the above force is not applied to the claw pedestal 11 as a whole. Since force is not applied locally or intensively, the claw pedestal 11 and the claw 13 are less likely to be damaged. Further, there is a space between the claw attachment part 14 and the arm 4, and there is also a space between the flange 15 and the claw pedestal 11. With this, claw 13
Each time crushing pressure is applied to the material, the tapered portions fit deeper, further preventing rattling. Furthermore, at this time, if the number of bolts 21 is increased, the attachment of the pawl 13 will become stronger and will not come loose.

In addition, as a method for configuring the attachment portion 14 of the claw 13 to be somewhat softer than the tapered portion of the claw base 11, there is a method such as hardening by heat treatment. for example,
The attachment part 14 of the claw 13 and the claw pedestal 11 are attached together.
Claw pedestal 11 made of special steel such as SNCM-8
If only the hole 12 is hardened by heat treatment, the hardness of the attachment portion 14 with respect to the hole 12 will be relatively low. According to such heat treatment, there is no need to go to the trouble of reducing the mechanical strength of the raw material when selecting the material constituting the claw 13, and the attachment portion 14 can be made to fit well into the hole 12 while maintaining the overall strength. be able to.

Effects of the Invention As described above, the present invention fixes the nail to the nail base by fitting the hole of the nail base formed into a tapered shape with the attachment portion of the nail that is somewhat softer than the hole. , the attachment part of the claw fits well into the hole of the claw base, and the forces applied to the claw from various directions are applied to the claw base as a whole, and are applied locally and concentratedly. This reduces damage to the nails and nail pedestals. In addition, since the claw is fixed by fitting the tapered hole and the mounting part, it is easy to attach and remove the claw, and even if excessive force is applied to the claw, the claw pedestal The claws, which are softer than the holes, deform and break first and absorb excessive force, preventing damage to parts that are difficult to replace or expensive, such as the claw pedestal or arm that is fixed to the arm. It is economical and repair work is easy because only a small nail needs to be replaced. Furthermore, since a space is formed between the claw attachment part and the arm, the claw will not come off or wobble during use. Additionally, for claws with flanges,
The gap between the flange and the pawl pedestal and the gap between the pawl mounting part and the arm are made almost the same, so when the pawl is pressed with great force, or after long-term use, the taper of the pawl bottoms out. When the grip is caused, the flange and the claw attachment portion come into contact with the claw pedestal and the arm, respectively, thereby distributing stress.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a plan view of a crusher to which the present invention is applied, Fig. 3 is a diagram showing a conventional claw mounting structure, and Fig. 4 is a diagram showing an embodiment of the present invention. FIG. 5 is a diagram showing one method of removing the nail in the embodiment, and is an explanatory view of the use of the nail removing rod. 4...Arm, 11...Claw pedestal, 13...Claw, 14
...Mounting part, 17, 18...Keyway, 19...Key, 1
6...Space, 21...Volt.

Claims (1)

[Scope of Claims] 1. In a crusher that crushes and crushes concrete, rocks, etc. of a structure, a claw pedestal having a tapered hole is fixed to an arm of the crusher, and the taper of the claw pedestal is fixed to an arm of the crusher. 1. A claw mounting structure for a crusher, characterized in that a claw having a tapered mounting portion made of a metal that is somewhat softer than the other parts is fitted and fixed in the tapered hole. 2. A claw attachment structure for a crusher according to claim 1, wherein the claw is further fixed to the arm with a bolt. 3. The claw is fixed by fitting the tapered hole of the claw pedestal with the tapered mounting portion of the claw, forming a space between the mounting portion of the claw and the arm. A claw attachment structure in a crusher according to item 1 or 2. 4. The crusher according to claim 1, 2 or 3, wherein a keyway is provided in each of the tapered surfaces of the claw pedestal and the claw attachment part, and a key is inserted into the keyway. Claw mounting structure. 5. The claw attachment according to claim 3, wherein the claw has a flange, and the distance between the flange and the claw pedestal is substantially the same as the space between the claw attachment part and the arm. structure.