JPH0421786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shear blade attachment device for a cutting machine that is attached to the tip of a boom of a working vehicle for cutting steel frames and other structural materials in concrete structures.

(Prior Art) A cutting machine for a working vehicle has a working range ranging from high places to underground, has various working angles, and is used under severe working conditions.

The shearing blades of cutting machines are subject to complex external forces from various directions, so the bolts that secure the shearing blades are likely to loosen, and working with the shearing blades loose can be dangerous as there is a risk of damage to the shearing blades or other serious accidents. be.

Therefore, it is necessary to tighten bolts that have become loose during work, resulting in low work efficiency.

(Problem to be solved) As a structure for fixing the shearing blade, there is a known structure (in practice) in which the shearing blade is fixed using a tapered intermediate body and a wedge body having a reverse taper in the groove of the mounting base. However, it is impossible to adopt such a mounting structure for a fixed type cutting machine to the shearing blade mounting device of the present invention because it is extremely dangerous, such as the shearing blades falling off. be.

The present invention has a mounting structure that uses the contact force of the cutting body itself to compress and compress the shearing blade, which tends to loosen during repeated cutting operations, and prevents the shearing blade itself and the mounting member from falling off even if the shearing blade itself becomes loose. It provides:

(Means for Solving the Problem) In the shearing blade mounting device of the present invention, a groove is formed in the opposing surface of the rotary collar body that opens and closes oppositely, with one side being a vertical surface and the other side being a tapered surface. The base of the shearing blade is inserted into the vertical surface side of the groove and is fixed to the flange body by a mounting bolt nut that passes through the shearing blade base and the vertical wall, and the inner surface of the shearing blade and the groove A rod-shaped wedge body having the same length as the shearing blade is press-fitted between the tapered surfaces of the shearing blade in a state in which it protrudes outside the groove, and the rod-shaped wedge body holds the wedge body and the flange body parallel to the shearing blade. It is fastened by a plurality of tightening bolts and nuts that pass through it vertically.

In the present invention, it is necessary that the rod-shaped wedge body protrude slightly from the groove so that it comes into contact with the cut object when the cut object is cut.

Further, it is preferable that the head or end portion of the bolt nut does not protrude outward from the member to which it is attached.

(Embodiment) In the figure, reference numeral 1 denotes a support plate that is integrated into the front and back, and its upper end (not shown) is rotatably attached to the tip of the boom of a working vehicle.

Reference numerals 2 and 2 denote collar bodies that rotate in opposition to each other, and are pivotally connected near their intermediate portions by separate pivot pins 3 and 4, and a driving hydraulic cylinder 5 is connected between their base ends. There is. 6 is a stopper fixedly installed between the support plates.

Reference numeral 7 indicates a crushing blade for pre-cutting treatment arranged oppositely to the opening end side of the collar body, 8 indicates a shearing blade adjacent to this, and 9
is the mounting bolt.

The mounting structure of the shearing blade is as shown in FIG. 2, and the shearing blade is mounted in a groove 10 formed on the inner surface facing the opening side of the collar body.

The groove has one side as a vertical surface 10a and the other side as a tapered surface 10b.

11 is a vertical wall, and 12 is a tapered wall.

Reference numeral 13 designates a plurality of bolt insertion holes drilled across the shear blade base 8a, and reference numeral 14 indicates insertion holes drilled at corresponding positions in the vertical wall 11.

The bolt head 9a is attached so as not to protrude from the blade surface of the shearing blade.

Further, it is preferable that the nut 15 also be provided with a counterbore portion 16 so as not to protrude from the outer surface of the vertical wall.

17 is a rod-shaped wedge body that is fitted into the groove along the shearing blade, and has a tapered surface 18 corresponding to the tapered surface 10b of the groove and a vertical surface 19 in contact with the blade surface of the shearing blade. A plurality of bolt insertion holes 20 parallel to the blade surface of the shearing blade are penetrated between both surfaces.

17a is the upper end of the wedge body and is attached so as to be exposed outside the groove.

21 is a tightening bolt, 21a is the head of the bolt, and a counterbore portion 17b is provided to prevent it from protruding outside the wedge body.
Located within.

22 is a concave hole for nut rotation formed from the back side of the collar body corresponding to the tightening bolt 21, 23 is a bolt insertion hole, 24 is a nut, and 25 is a concave groove bottom 10c.
and the space between the wedge body.

(Function) When the object A to be cut is sandwiched as shown in FIG. 2 and the collar body is moved in the direction of the arrow, it will be cut as shown in FIG. 3.

At this time, the cut objects are pushed by the tips of the shearing blades and come into contact with the exposed upper end portions of the wedge bodies on the opposite side, thereby acting to push the wedge bodies into the grooves.

Therefore, the next cutting operation can be carried out with the shearing blade firmly fixed by the wedge body.

If the tightening bolts become loose due to repeated work,
It is only necessary to retighten the nut 24, and there is no danger of either the shear blade or the wedge body falling off during this process.

(Effects) As described above, according to the mounting structure of the present invention, the upper end portion 17a of the rod-shaped wedge body adjacent to each shearing blade is press-fitted with the upper end portion 17a protruding from the groove in which the wedge body is accommodated. As shown in Fig. 3, each cutting body comes into contact with the upper end of each wedge in such a way as to push it into the concave groove, and the wedge body is automatically pushed in each cutting operation, resulting in shearing. The fixation of the blade is ensured, allowing repeated cutting operations without the need for frequent retightening, and efficiency is also improved.

Furthermore, since the rod-shaped wedge body is configured to have the same length as the blade of the shearing blade, the above-mentioned effects can be expected no matter where the cutting is performed.

Additionally, even if the tightening bolts become loose, there are no parts that will fall, so you can work at heights with confidence.

[Brief explanation of drawings]

Fig. 1 is a front view of a cutting machine equipped with a shearing blade according to the mounting structure of the present invention, Fig. 2 is a sectional view taken along the line shown in Fig. 1, and Fig. 3 is a sectional view showing the relationship between the cut object and the wedge body during cutting. It is. Explanation of symbols 8 is shear blade, 9 is mounting bolt, 1
0 is a groove, 17 is a wedge body, 17a is an upper end, 2
1 is a tightening bolt.

Claims (1)

[Claims] 1 A groove with one side being a vertical surface and the other side being a tapered surface is formed on the opposing surfaces of the rotating collar bodies that open and close oppositely, and the base of the shearing blade is inserted into the vertical surface side of the groove. A rod-shaped wedge having the same length as the shearing blade is fixed to the flange body by a mounting bolt nut passing through the base of the shearing blade and the vertical wall, and a rod-shaped wedge having the same length as the shearing blade is provided between the inner surface of the shearing blade and the tapered surface of the groove. The rod-shaped wedge body is press-fitted with the body projecting out of the groove, and the rod-shaped wedge body is fastened by a plurality of tightening bolts and nuts that vertically pass through the wedge body and the collar body in parallel with the shearing blade. A shear blade attachment device for cutting machines that can be attached to working vehicles.