JPH0326846Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a crushing device such as a cutter or crusher for crushing structures such as reinforced concrete.

2. Description of the Related Art This type of crushing device crushes an object by opening and closing a pair of arms each having a crushing blade at the tip, and biting an object between the crushing blades of both arms.

In the conventional device, as shown in FIG.
A stopper e, which is free with respect to c' and is provided on the side plate c when the arms a and a', which are pivoted to the side plate c with axes f and f', are opened to the maximum and minimum positions,
e' is configured to restrict the wobbling of both arms a and a', and a hydraulic cylinder in which one piston rod d is inserted is used as hydraulic cylinder b, and one arm a is connected to its hydraulic cylinder b. The other arm a' was connected to the piston rod d.

Problems to be Solved by the Invention In such a crushing device, it is necessary not only to open and close both arms, but also to bite the object to be crushed at the center between the two arms to prevent reaction force from acting on the device. However, in the conventional device, both arms a and a' can swing freely within the movable range until they come into contact with stoppers e and e', so when both arms are in a horizontal state, when the piston rod is extended, Arms a and a' are opened symmetrically with respect to the center line, but when both arms a and a' do not contact stoppers e and e', that is, at an intermediate opening degree between the minimum opening and the maximum opening, When both the arms a and a' are in the vertical state, the weight of the hydraulic cylinder b causes one of the arms a, a,
Rotate until a' comes into contact with one of the stoppers e and e'. FIG. 5 is a diagram showing the state at this time. In FIG. 5, the crushing device is rotated so that the left side is up and the right side is down, and the arm is a,
a' is rotated clockwise around the axes f and f' until one or both of the arms a and a' abuts against the stoppers e and e', and the state shown in Fig. 5 is maintained. becomes. Therefore, each time the direction in which the object to be crushed changes, the center line of the opening changes, making crushing control and work difficult, and the position at which the object is to be crushed changes, resulting in a reaction force in the device. was.

To prevent this, open arms a and a' to the maximum to prevent them from wobbling, and then
The object to be crushed must be caught in the center between a', but if the arms a and a' are opened wide, there will be a large loss of working time, especially when crushing thin or small objects.

Means and action for solving the problem The intermediate support shafts of a pair of arms having crushing blades at the tips are pivotally connected to the side plates, and a double-acting hydraulic cylinder is disposed between the side plates to be orthogonal to the longitudinal axis direction. Then, trunnion pins protruding from the hydraulic cylinder so as to be guided by the side plate are engaged with both sides of the side plate, and a pair of trunnion pins inserted on both sides of the hydraulic cylinder and moved back and forth symmetrically with respect to the vertical axis are engaged with both sides of the side plate. A piston rod is pivotally attached to the rear end of each arm, and the trunnion pin of the hydraulic cylinder is guided by both sides of the side plate and slidably moves in the vertical axis direction to prevent the hydraulic cylinder from tilting. The aim is to open the handle at any position without wobbling, and to ensure that the crushed object is caught in the center between both arms.

Embodiment Hereinafter, the present invention will be explained based on a first embodiment shown in FIGS. 1 to 3.

In the figure, 1 and 1' are a pair of blades having crushing blades 2 and 2' at their tips, and pivoting shafts provided in the middle of the side plates 3 and 3' via shafts 4 and 4'. The crushing blades 2, 2' are, for example, a pair of crushing blades 2a, 2a' disposed opposite to each other at the tips of the arms 1, 1' and the arms 1, 2'.
A pair of shearing blades 2b arranged opposite to each other on the support shaft side of 1′,
2b'. A double-acting hydraulic cylinder 6 is provided between the side plates 3, 3. As shown in FIG. 3, this double-acting hydraulic cylinder 6 has a cylinder cylinder 6a disposed between the side plates 3 and 3'.
are closed at both ends by end plates 6b, 6b', and a pressure oil port 6c is formed in the center, and pressure oil ports 6d, 6d' are formed near the end plates 6b, 6b', respectively. 6d and 6d' are connected, for example, to a hydraulic power source (not shown) on a crushing machine equipped with the device of the present invention. On both sides of this hydraulic cylinder 6, a pair of piston rods 8, 8' are provided with the end plates 6b, 6.
b', and these piston rods 8, 8'
is the pressure oil port 6c or 6d, 6 of the hydraulic cylinder 6
By selectively supplying pressure oil into the cylinder tube 6a through d', the cylinder 6a can be moved forward and backward symmetrically with respect to the vertical axis X-X'. and,
The tips of the piston rods 8, 8' are pivotally connected to the rear ends of the arms 1, 1' via pins 9, 9', respectively. Trunnion pins 7a, 7a', 7b, 7b' are protruded from this double-acting type hydraulic cylinder 6 so as to sandwich the side plates 3, 3, and these trunnion pins 7a, 7a', 7b, 7b' .

Further, the side plates 3, 3 are fixed to a rotating plate 10, and the rotating plate 10 is attached to a support plate 11 so as to be freely rotatable around an axis. A bracket member 12 having mounting holes 13 and 14 is fixed to this support plate 11. Mounting hole 1 of bracket member 12
3 is pivotally attached to the tip of a boom 15 of a movable crushing machine (not shown) via a pin 16, for example, and the mounting hole 14 is connected to the tip of a piston rod 18 of a hydraulic cylinder 17 installed on the boom 15. is pivotally connected to the piston rod 18 via a pin 19.
By changing the protruding length of the side plates 3, 3, that is, the arms 1, 1', the working angle can be set.

To explain the operation of crushing the reinforced concrete structure A using the apparatus of the present invention configured as described above, first, the piston rods 8, 8' are retracted by the hydraulic cylinder 6, and the arms 1, 1' are moved as shown in FIG. The boom 15 of the crushing machine in the open position as shown in
By operating the hydraulic cylinder 17, the arm 1,
The object A to be crushed is placed in the center between the crushing blades 2a and 2a' of 1'.
position. Next, the piston rods 8, 8' are extended by the hydraulic cylinder 6 to close the arms 1, 1' as shown in FIG. 1, and the crushing blades 2a, 2 are closed.
The concrete part A' is destroyed by pushing the concrete structure A by a'. When concrete part A′ is destroyed, the internal reinforcing steel
A'' is exposed. This exposed reinforcing bar is positioned at the center between the shearing blades 2b, 2b' by retracting the piston rods 8, 8' again and opening the arms 1, 1'. By extending 8', the exposed reinforcing bars are cut by the shearing blades 2b, 2b', and the reinforced concrete structure A is crushed.

During this crushing operation, the hydraulic cylinder 6 moves up and down as shown in FIGS. 1 and 2, but the trunnion pins 7a, 7a', 7b, and 7b' are guided by both side edges of the side plates 3 and 3'. Therefore, the hydraulic cylinder 6 is
In Figures 2 and 2, even if the crushing device is moved up and down while maintaining the horizontal position and one arm is placed in the lower position and the other arm is placed in the upper position, the fourth
As shown in the figure, arms 1 and 1' do not rotate,
Since the hydraulic cylinder 6 is held in the states shown in FIGS. 1 and 2 by the trunnion pins 7a, 7a', 7b, and 7b', the openings of the arms 1 and 1' are always symmetrical about the vertical axis X-X'. Opening and closing operations will be performed.

FIG. 4 is a diagram showing a second embodiment, which is different from the first embodiment described above. The trunnion pins 7a, 7a', 7b, 7b' fixed to the cylinder 6 are connected to the guide portions 3a, 3
When the hydraulic cylinder is activated, the trunnion pin 7 is brought into contact with the inside of the guide portions 3a and 3b.
a, 7a', 7b, and 7b' are guided to move the hydraulic cylinder 6 parallel to the side plate 3 in a direction perpendicular to the side plate 3.

In the above embodiment, the crushing blades 2, 2' are equipped with crushing blades 2a, 2a' and shearing blades 2b, 2b'. It can also be carried out using a crushing device equipped with only a blade. When the present invention is implemented in a crushing device (cutter) having only a shearing blade as described above, the objects to be crushed are mainly thin and small items, so there is an advantage that the various effects of the present invention described above can be more fully exhibited.

In addition, the trunnion pin in the above embodiment is
Although one protrusion was provided on each side of the side wall of the hydraulic cylinder 6 at the front and back, the number may be increased to two or three. Furthermore, the trunnion pins 7a, 7a', 7b, and 7b' may be provided with bushings or may be provided with rotatable rollers to improve the sliding between the trunnion pins and both side edges of the side plates 3 and 3'. Further, in order to prevent rotation of the hydraulic cylinder 6, in the first embodiment, a plate extending in the form of a flange from the side plates 3, 3' may be provided to cover the head of the trunnion pin.

Effects of the invention As described above, since the trunnion pin of the hydraulic cylinder slides on the guides on both sides of the side plate, the hydraulic cylinder does not move in the longitudinal direction but only in the vertical direction, and the arms 1 and 1' are moved vertically. The piston rods 8, 8' move back and forth symmetrically with respect to the axis to open and close the pins 4, 4' symmetrically with respect to the vertical axis, and there is no wobbling in any opening position.

For this reason, both arms 1 opened at arbitrary positions,
The object A to be crushed can be reliably caught in the center between arms 1 and 1', and especially when crushing thin or small items, both arms 1 and 1' can be opened with a correspondingly small opening width.
By opening and closing the crusher, it is possible to greatly reduce the loss of working time, and the crushing apparatus can be easily controlled and operated.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a side view of the same as shown in the operating state, and FIG. 4 is a cross-sectional view taken along the - line, FIG. 4 is a diagram showing the second embodiment, and FIG. 5 is a side view of the conventional device. 1, 1'...Arm, 3...Side plate, 6...Double-acting hydraulic cylinder, 7a, 7a', 7b, 7b'...
Trunnion pin, 8, 8'...piston rod.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The intermediate support shafts of a pair of arms having crushing blades at their tips are pivotally connected to side plates, and a double-acting hydraulic cylinder is arranged between the side plates to be orthogonal to the longitudinal axis direction. A trunnion pin is provided on the hydraulic cylinder and protrudes so as to be guided by a side plate, and a pair of piston rods that are inserted on both sides of the hydraulic cylinder and move back and forth symmetrically with respect to the vertical axis are connected to each arm. A crushing device that is pivotally attached to the rear end. (2) The crushing device according to claim 1, wherein the trunnion pin is provided on a hydraulic cylinder so as to sandwich the side plates. (3) The side edge of the side plate has a guide portion protruding toward the hydraulic cylinder, and the trunnion pin is fixed to the hydraulic cylinder so as to abut the inside of the guide portion. The crushing device according to item 1. (4) The crushing device according to claim 1, 2 or 3, wherein the trunnion pin is rotatably formed into a roller shape. (5) The trunnion pins guided by each side edge of the side plate are each comprised of a plurality of pieces. Device.