JPH0648057Y2 - Concrete crusher for power shovel - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete crusher for a power shovel used when dismantling a concrete structure or the like.

[0002]

2. Description of the Related Art As a conventional concrete crusher for a power shovel of this type, a connecting portion and a base portion are rotatable via rolling bearings so that a crushing arm can properly bite concrete. When connecting and changing the opening and closing direction of the crushing arm, the operator slightly touches the crushing arm against the structure etc. being dismantled and rotates the base part. There was something.

[0003]

However, in the case where the conventional connecting portion and the base portion are rotatably connected to each other through the rolling bearing, the rolling resistance of the bearing portion is small, and therefore, the rolling portion rotates too much when the direction is changed. There is a problem that the positioning cannot be performed easily, and a separate braking device is required to prevent this excessive rotation. The present invention has been made to solve the above-mentioned conventional problems, and the purpose thereof is to easily perform crushing even if the base portion to which the crushing arm is attached does not have a rotation motor. An object of the present invention is to provide a concrete crusher for a power shovel, which can position an arm.

[0004]

As a means for achieving the above object, in the concrete crusher for a power shovel of the present invention, the tip of the intermediate boom of the power shovel and the tip side of the piston rod of the hydraulic cylinder are provided. On the other hand, a power having a pair of crushing arms that are opened and closed by hydraulic pressure is rotatably supported on a base part that has a connecting part that can be rotatably connected to each other.
A concrete crusher for excavators, wherein the base portion and the connecting portion have parallel surface portions facing each other, and between the parallel surface portions, a pair of ring-shaped sliding plates are arranged in parallel in a substantially central portion. A holding ring integrally provided with a shaft portion slidably fitted in the inner diameter portions of both ring-shaped sliding plates and a disk portion orthogonal to the shaft portion is a ring-shaped sliding plate. The holding rings are arranged so as to be slidably sandwiched between each other, and the holding ring is fixed to one parallel surface portion and the pair of ring-shaped slide plates are fixed to the other parallel surface portion.

[0005]

In the concrete crusher for a power shovel according to the present invention, the parallel surface portion of the base portion that pivotally supports the pair of crushing arms and the parallel surface portion of the connecting portion that connects the base portion to the intermediate boom of the power shovel. And a pair of ring-shaped sliding plates arranged in parallel with each other are fixed to the other parallel surface portion, and a holding ring having a disk portion sandwiched between the ring-shaped sliding plates is provided on one parallel surface portion. It is fixed. When the concrete crusher is suspended in air, the load is held at the face-to-face portion between the ring-shaped sliding plates and the disc portion. Further, since the sliding portion slides at the face-to-face portion, the base portion can be rotated. In this case, it is possible to position the crushing arm at an appropriate position without causing an excessive load to the rotation of the base portion due to the slip resistance of the face-to-face portion and causing excessive rotation. Further, when a force acts in the displacement direction at the face-to-face portion, it can be held by the fitting portion formed by the inner diameter portion of the ring-shaped sliding plate and the shaft portion of the holding ring.

[0006]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a partially cutaway front view showing a concrete crusher for power shovels of the present embodiment, FIG. 2 is a sectional view showing a rotating part of the same, FIG. 3 is a sectional view showing a swivel joint part of the same, and FIG. It is explanatory drawing which shows the use condition. The concrete crusher A for a power shovel of this embodiment has a connecting portion 1, a base portion 2, a rotating portion 3, one crushing arm 4, the other crushing arm 4a, and an opening / closing hydraulic cylinder 5. And the tuning means 6 are the main components.

The connecting portion 1 serves as a mounting portion for mounting the power shovel 7 on the intermediate boom 70, and a pair of left and right brackets 10, 10 facing each other are fixed to the upper surface of the lower plate 11 with a predetermined space therebetween. ing. The bracket 10,
10, a tip portion 71 of the intermediate boom 70 in the power shovel 7 and a hydraulic cylinder 72 on the intermediate boom 70.
It has pivot holes 12 and 13 for rotatably and detachably connecting to the piston rod tip side 73. In the drawing, 14 is a link connecting the piston rod tip side 73 and the pivot hole 13, and 15 is a guide link connecting the link 14 and the intermediate boom 70.

The base 2 is provided with both crushing arms 4 and 4a.
And a pair of left and right side plates 20 and 20 facing each other, which serve as a mounting portion for the opening and closing hydraulic cylinder 5.
It is fixed on the lower surface side of the so as to be separated for a predetermined period. The side plate 2
0 and 20, both crushing arms 4 and 4a at the downward symmetrical position.
Through holes 22, 22 for the shaft support are provided. The lower surface plate 11 of the connecting portion 1 and the upper surface plate 21 of the base portion 2 are arranged in parallel to form a parallel surface portion 23.

The rotating part 3 is for freely rotating the base part 2 to position the crushing arms 4 and 4a, and has a holding ring 30 and a pair of ring-shaped sliding disks 31 ,.
32 and a fixed bracket 33 for the sliding disks 31, 32. The holding ring 30 has a disc portion 30b at an intermediate portion of the shaft portion 30a, and the top plate 21 of the base portion 2 is provided.
It is firmly fixed to the upper surface of the and substantially in the center. The outer peripheral surface of the shaft portion 30a and both surfaces of the disc portion 30b are formed as sliding surfaces. The sliding discs 31 and 32 are for rotatably holding the retaining ring 30 with the disc portion 30b of the retaining ring 30 faced from above and below, and are arranged on the upper surface side of the disc portion 30b. The sliding disc 31 has a sliding surface on the lower surface side, and is provided with a sliding hole 31a as an inner diameter portion fitted into the shaft portion 30a of the holding ring 30. Further, the sliding disk 32 arranged on the lower surface side of the disk portion 30b is provided with a sliding hole 32a as an inner diameter portion which is formed on the upper surface side as a sliding surface and is fitted into the shaft portion 30a.
The holding ring 30 is made of carbon steel, and the sliding disk is made of gun metal. The fixing bracket 33 is
It is fixed to the center of rotation of the bottom plate 11 of the connecting portion 1,
The fixing bracket 33 is provided with a ring-shaped lower end member 33a that holds the sliding disc 31 in parallel with the upper plate 21, and is a circle that faces the sliding disc 32 arranged on the upper plate 21 side. The upper surface of the plate portion 30b is provided so as to be held at a height that is in contact with the lower surface of the sliding disk 31. This rotating part 3
By providing a swivel joint 34 at the center of rotation, the base part 3 is formed so as to be freely rotatable in any direction. In the figure, 34a is an outer cylinder portion fixed to the lower surface plate 11 of the connecting portion 1, and 34b is a shaft portion fixed to the upper surface plate 21 of the base 2. Further, 34c is a retaining nut for the shaft portion 34b, 34d and 34d are fixed side connection ports, and 34e and 3d.
4e is a rotation side connection port.

The one crushing arm 4 is provided with a crushing blade 40 for crushing concrete and a shearing blade 41 of a reinforcing bar on the front end side 42, and a supporting shaft 43 is provided on one end side of the base portion 2. Is rotatably supported on the piston rod 5 of the opening / closing hydraulic cylinder 5 by a base end portion 44 above the shaft support portion.
0 and a spindle 51 are rotatably connected. The other crushing arm 4a is provided with a crushing blade 40a facing the crushing blade 40 and a shearing blade 41a intersecting the shearing blade 41 on the tip end side 42a, and the spindle 43a serves as the base. A base end portion 44a, which is rotatably supported by the other end of the base portion 2 and is above the shaft support portion, is rotatably connected to a cylinder 52 of the opening / closing hydraulic cylinder 5 by a support shaft 53. .

The tuning means 6 comprises both crushing arms 4 and 4a.
The opening and closing of the crushing arm 4 is synchronized, and a projecting portion 45 is provided from the lateral position of the shaft support portion of the crushing arm 4 toward the inner side in the opening and closing direction of the crushing arm 4 and the projecting portion 45. An elongated hole 46 is provided on the inner side of the casing so as to extend obliquely upward. Further, a protrusion 45a is provided which intersects the protrusion 45 inwardly from a lateral position of the shaft support portion 43a of the crushing arm 4a in parallel with the protrusion 45. The protrusion 45a is movable in the elongated hole 46. The rotation support shaft 46a to be fitted
Is projected.

Next, the operation of this embodiment will be described. First, when hydraulic pressure is applied to the opening / closing hydraulic cylinder 5, the piston rod 50 and the cylinder 52 relatively push open the base end portions 43 and 43a of the crushing arms 4 and 4a, so that the tip end sides 42 and 42a are moved. The crushing blades 40 and 40a rotate in the closing direction.
To crush concrete, and also shear blades 41 and 41a
You can cut the rebar with and. Further, at this time, since the slot 46 and the rotation support shaft 46a are in opposite positions to the support shafts 43, 43a, the rotation directions are regulated and interfere with each other. Can be made.

Further, in the rotating portion 3, the upper and lower surfaces of the disc portion 30b provided on the holding ring 30 and the pair of sliding discs 31, 3 are provided.
With the sliding surface of 2, the base 2 can be rotated while receiving a load in the radial direction. In this case, since the slip resistance acts as a brake and the base 2 rotates only while applying a force in the rotational direction, the base 2 can be positioned at any position. Further, since the shaft portion 30a of the retaining ring 30 and the sliding holes 31a and 32a of the sliding discs 31 and 32 are fitted to each other, the load of the base portion 2 in the thrust direction can be carried.

As described above, according to the present embodiment, since the rotating portion is rotated by the sliding surface, it is rotated only while the sliding resistance acts and the force is applied in the rotating direction. Accurate positioning can be performed without doing this.

A pair of ring-shaped sliding disks 31, 32 are also provided.
Since the disk portion 30b is slidably held by the above, it is possible to receive the force acting in either the vertical direction of the rotating portion 3. Further, since the sliding holes 31a, 32a of the sliding discs 31, 32 are fitted to the shaft portion 30a formed integrally with the disc portion 30b, it is possible to receive a force acting in the lateral direction. Therefore, a compact structure with excellent operability and durability can be obtained.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and the present invention is not limited to this embodiment even if the design is changed without departing from the scope of the invention. Included in the device. For example, in the embodiment, the holding ring 30 is fixed to the upper surface plate 21 of the base portion 2, but it is fixed to the lower surface plate 11 of the connecting portion 1 and the sliding disks 31 and 32 are fixed to the upper surface plate 21 side. You may

In the embodiment, the holding ring 30 in the rotating portion 3 is made of carbon steel and the ring-shaped sliding disk 32 is made of gun metal, but the invention is not limited to this, and other metal or alloy material is used. , Coating material, resin, etc. can be arbitrarily set.

Further, in the embodiment, the base portion 2 is formed so as to be rotatable in an arbitrary direction without limitation by providing a swivel joint, but the swivel joint may be attached arbitrarily, and the shape of the swivel joint is also set. It is optional.

Further, in the embodiment, the protruding portion 4 of the tuning means 6
Although 5,5a are provided at the lateral positions of the shaft supporting portion, the position of the protruding portion is not limited to this, and can be set arbitrarily.

[0020]

As described above, in the concrete crusher for a power shovel according to the present invention, since the rotating part has the sliding bearing structure, the sliding resistance exerts a braking force to rotate the base part to apply a force. The crushing arm can be accurately positioned without providing a rotation motor or a special brake device.

Further, since the disk portion, which is the rotating body, is slidably held by the pair of ring-shaped sliding plates, it is possible to receive the force acting in either the vertical direction of the rotating portion. Further, since the inner diameter portion of the sliding plate is fitted to the shaft portion formed integrally with the disc portion, it is possible to receive the force acting in the lateral direction. Therefore, it is possible to obtain an effect such as a compact structure having excellent operability and durability.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a concrete crusher for a power shovel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a rotating part of the above.

FIG. 3 is a sectional view showing a swivel joint portion of the above.

FIG. 4 is an explanatory diagram showing a usage state of the above.

[Explanation of symbols]

 A Concrete crusher for power shovel 1 Connection part 2 Base part 3 Rotating part 4 One crushing arm 4a The other crushing arm 5 Opening / closing hydraulic cylinder 7 Power shovel 11 Lower plate 20 Side plate 21 Upper plate 22 Through hole 23 Parallel Face part 30 Holding ring 31 Ring-shaped sliding disk (ring-shaped sliding plate) 32 Ring-shaped sliding disk (ring-shaped sliding plate) 33 Fixed bracket 30a Shaft part 30b Disk part 31a Sliding hole (inner diameter part) 32a Sliding hole (inner diameter part) 43 Spindle 43a Spindle 70 Intermediate boom 71 Intermediate boom tip 72 Hydraulic cylinder 73 Piston rod tip

Claims (1)

[Scope of utility model registration request] 1. A pair of bases that are hydraulically opened / closed to a base having a connecting portion that is rotatably connected to the tip of the intermediate boom of the power shovel and the tip of the piston rod of the hydraulic cylinder. Is a concrete crusher for power shovels which axially supports the crushing arm, wherein the base portion and the connecting portion have parallel surface portions facing each other, and between the parallel surface portions, a substantially central portion is provided. A pair of ring-shaped sliding plates are arranged in parallel with each other, and a shaft portion slidably fitted in the inner diameter portions of both ring-shaped sliding plates and a disc portion orthogonal to the shaft portions are integrally provided and held. The ring is arranged such that the disc portion is slidably sandwiched between the ring-shaped sliding plates, the holding ring is fixed to one parallel surface portion, and the pair of ring-shaped sliding plates are parallel to each other. Concrete for power shovel characterized by being fixed to the surface Crusher.