JPH0336382B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a crushing device such as a cutter or crusher for crushing a structure such as reinforced concrete, and a gripping device such as a glove.

BACKGROUND TECHNOLOGY This type of crushing device crushes an object by opening and closing a pair of arms each having a crushing blade at the tip thereof so that an object to be crushed is bitten between the crushing blades of both arms.

In the conventional device, as shown in FIG. 3, a hydraulic cylinder b that opens and closes arms a and a' is connected to side plates c and
It is free with respect to c', and is pivotally connected to side plates c and c' with axes f and f', and provided on side plates c and c' with arms a and a' at the maximum or minimum open position. The stoppers e and e' are configured to prevent wobbling of both arms a and a'.

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 both arms to prevent reaction force from acting on the device. No. 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, piston rod d is extended. In this case, arms a, a' are opened symmetrically with respect to the center line, but both arms a, a' are opened at stopper e,
When the arms a and a' are in a vertical state when not in contact with e', that is, at an intermediate opening degree between the minimum opening and the maximum opening, the hydraulic cylinder b
, one of the arms a, a' rotates until it abuts one of the stoppers e, e'. Figure 3 is a diagram showing the state at this time.
Figure 3 shows the state when the crushing device is rotated so that the left side is upward and the right side is downward, and the gravity of hydraulic cylinder b causes arms 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. 3 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 gripped changes, resulting in a reaction force in the device. was.

To prevent this, it is best to open the arms a and a' to the maximum extent to prevent them from wobbling before starting work. However, when the arms a and a' are opened wide, there is a problem in that there is a large loss of working time, especially when crushing thin or small objects, and it is difficult to perform the crushing work.

Means and Effects for Solving the Problems The present invention has been made in view of the above-mentioned circumstances, and includes a pair of arms having a crushing blade at their tips, whose intermediate support shafts are pivotally connected to the side plates, and a space between the side plates. In a crushing device in which a double-acting hydraulic cylinder is disposed orthogonal to the vertical axis direction, one arm is connected to the hydraulic cylinder, and the other arm is connected to a piston rod, the side plate is connected to the hydraulic cylinder. The rear end of the arm forms a long groove on an arc similar to the trajectory taken when the arm opens and closes, and a trunnion pin protruding from the side wall of the hydraulic cylinder is fitted into the long groove so as to be able to swing freely. The aim is to prevent the arm from tilting, to allow the arm to open at any position without wobbling, and to ensure that the crushed object is caught at the center between both arms.

Embodiments The present invention will be described below based on embodiments shown in FIGS. 1 and 2.

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 9 and 9'. The crushing blades are, for example, a pair of crushing blades 2a, 2a' arranged oppositely at the tips of the arms 1, 1', and a pair of shearing blades 2b, 2 oppositely arranged on the spindle side of the arms 1, 1'.
b'. A double-acting hydraulic cylinder 4 is disposed between the side plates 3 and 3' and is perpendicular to the vertical axis direction, and the rear end of one arm 1 is pivotally connected to the hydraulic cylinder 4 via a pin 5. The other arm 1' is pivotally connected to the piston rod 6 via a pin 5'.

A hydraulic cylinder 4 is attached to the side plates 3, 3'.
The rear end of the arm 1 connected to the arm 1 is formed with arc-shaped long grooves 7, 7' facing each other, similar to the locus taken when the arm opens and closes, and the hydraulic cylinder 4 is provided with a projection in the long grooves 7, 7'. trunnion pins 8, 8'
be fitted so that they can swing freely. Further, the side plates 3, 3' are fixed to the rotating plate 10, and the rotating plate 10
is attached to the support plate 11 so as to be rotatable around an axis. A bracket member 14 is fixed to the support plate 11, and has a mounting hole 12 for mounting on the boom of a crushing machine and a mounting hole 13 for mounting on the piston rod of a hydraulic cylinder installed on the boom. In addition, 15,
Reference numeral 15' denotes a stopper that corresponds to the maximum and minimum open positions of the arms 1 and 1'.

To explain the operation of crushing a reinforced concrete structure using the apparatus of the present invention configured as described above, first, the piston rod 6 is retracted by the hydraulic cylinder 4, and the arms 1 and 1' are opened.
By operating the boom and hydraulic cylinder of a crushing machine (not shown), the crushing blades 2a,
Place the object to be crushed in the center between 2a'. Next, the piston rod 6 is extended by the hydraulic cylinder 4 to close the arms 1, 1', and the crushing blades 2a,
2a', the concrete part is destroyed by pushing the concrete structure. When the concrete section is destroyed, the internal reinforcing steel is exposed. The exposed reinforcing bars are removed by retracting the piston rod 6 again and opening the arms 1, 1' to remove the shearing blades 2b, 2.
It is located at the center between b′. Next, piston rod 6
By stretching the shear blades 2b, 2
At b′, the exposed reinforcing steel is cut and the reinforced concrete structure is crushed.

During this crushing operation, the arm 1 rotates around the shaft 9, but the arc-shaped long groove has the same shape as the locus of the pin 5, which is the pivot point between the rear end of the arm 1 and the hydraulic cylinder 4. Trunnion pins 8, 8' projecting from the hydraulic cylinder 4 inside 7, 7' swing. At this time, since the distance between the pin 5 and the trunnion pin 8 is constant, the hydraulic cylinder 4
It is held perpendicular to the vertical axis X-X' as shown in the figure and moves up and down. This allows the arms 1, 1' to move in one direction as shown in FIG.
The opening and closing operations are always performed symmetrically with respect to the vertical axis X-X' without deviation.

In the above embodiments, the destruction blades 2 and 2' are equipped with crushing blades 2a and 2a' and shearing blades 2b and 2b', but the present invention is not limited to blades equipped with only crushing blades or shearing blades. 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 objects and small objects, so there is an advantage that the above-mentioned effects of the present invention can be more fully exerted. Further, the arcuate long grooves 7 may not be formed as through holes as in the above embodiments, but may be formed in a concave groove shape in cross section with the outer surface of each side plate 3 being blind.

Effects of the Invention As described above, the hydraulic cylinder is restricted by the arc-shaped long groove of the side plate into which the trunnion pin fits, so that the hydraulic cylinder does not move in the longitudinal direction, but only in the vertical direction. , the arm opens and closes symmetrically and does not wobble in any opening position. Therefore, the object to be crushed can be reliably captured at the center between the two arms that are opened at arbitrary positions.Especially when crushing thin or small items, both arms can be opened and closed with a correspondingly small opening width. This significantly reduces the loss of working time and makes it easier to control and operate the crushing device.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a side view of a conventional device. 1, 1'... Arm, 3, 3'... Side plate, 4...
Double-acting hydraulic cylinder, 6...Piston rod, 7
...A long arc-shaped groove, 8...Trunion pin.

Claims (1)

[Claims] 1 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. In a crushing device in which one arm is connected to a hydraulic cylinder and the rear end of the other arm is connected to a piston rod, the rear end of the arm connected to the hydraulic cylinder is attached to the side plate in a manner similar to the trajectory taken when the arm opens and closes. It forms long arc-shaped grooves,
A crushing device characterized in that a trunnion pin protruding from the hydraulic cylinder is swingably fitted into the long groove.