JPH0336980B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crushing device such as a cutter or crusher for crushing structures such as reinforced concrete.

(Technical Background of the Invention and Problems Thereof) The present applicant has proposed that the intermediate portion of a pair of arms having crushing blades be pivoted between parallel side plates, and that a vertically elongated hole be formed in each side plate along the longitudinal axis direction. A trunnion pin protruding from the cylindrical wall of a double-acting hydraulic cylinder that intersects with the vertical axis direction is slidably pivotally attached to each of the longitudinal holes, and a pair of piston rods are inserted into the cylinder from both sides. proposed a crushing device (Japanese Patent Laid-Open No. 60-233276) in which the two arms are pivotally connected to the rear ends of the respective arms. However, since this device is configured so that the cylinder can freely rotate around the piston stem, the hydraulic hose connected to the hydraulic cylinder will not oscillate irregularly when supplying or draining pressure oil from the hydraulic cylinder. There was a concern that the hydraulic cylinder would rotate around the piston stem inadvertently due to such movement, and the trunnion pin would fall out of the vertical hole. In addition, although the vertical hole and trunnion pin are protected by covering the outer surface of the vertical hole with a cover, it is easy for concrete debris to become clogged between the cover and the end face of the trunnion pin, and work continues with this clog. This caused accidents such as pushing the gap between the side plates wider or damaging the cover or trunnion pin.

(Structure of the Invention) The structure of the present invention is such that the intermediate portion of a pair of arms having crushing blades is pivotally connected between parallel side plates, and
A vertically long hole extending along the vertical axis direction is formed in each side plate, and a trunnion pin protruding from the cylinder wall of the double-acting hydraulic cylinder that intersects with the vertical axis direction is slidably pivoted in each vertically long hole, and the hydraulic In a crushing device in which a pair of piston rods are inserted into a cylinder from both sides and are pivotally connected to the rear end of each of the arms, both ends covering the entire length of each of the vertical holes are provided on the outer surface of the vertically long holes of each of the side plates. A cover with an open vertical groove formed on the inner surface is attached, and concrete debris etc. that have entered between the cover and the end face of the trunnion pin are allowed to fall under their own weight through the vertical groove of the cover and are quickly discharged to the outside. A rotation preventing body fixed to the cylindrical wall of the hydraulic cylinder is brought into contact with the inner surface of each of the side plates to prevent the piston from rotating around the piston rod, thereby preventing the hydraulic cylinder from rotating around the piston rod.

(Embodiment of the Invention) The present invention will be described below based on an embodiment shown in the drawings.

In the figure, 1 and 1' are a pair of arms having opposing crushing blades 2 and 2' and whose intermediate parts are pivoted between parallel side plates 3 and 3 via pins 4 and 4'. , the crushing blades 2, 2' are, for example, a pair of crushing blades 2a, 2a' arranged oppositely at the tips of the arms 1, 1', and the arms 1, 1 on the side of the pins 4, 4' from the crushing blades 2a, 2a'. A pair of shearing blades 2b, 2b' are arranged opposite to each other. Vertical elongated holes 5, 5 are formed in the side plates 3, 3 to face each other, respectively, along the longitudinal axis direction X-X'. Guides 6, 6 having a rectangular cross section are slidably fitted into the vertical holes 5, 5.
The small diameter ends 8a of trunnion pins 8, 8 protruding from the cylindrical wall of the double-acting hydraulic cylinder 7 intersecting the longitudinal axis direction X-X' are rotatably fitted into the center holes 6a of the 6. It will be worn. This double-acting hydraulic cylinder 7
As shown in FIG. 2, both ends of the cylinder tube 7a disposed between the side plates 3 and 3 are closed by end plates 7b and 7b', and the central part of the cylinder tube 7a and the end plates 7b and 7b are closed. 'Pressure oil ports 7c and 7d, 7 to which hydraulic hoses (not shown) are connected, respectively, in the vicinity
d', and these pressure oil ports 7c, 7d, 7d' are connected to, for example, a hydraulic pressure supply source (not shown) on a crushing machine equipped with the device of the present invention. A pair of piston rods 9, 9' are inserted into this hydraulic cylinder 7 from both sides through end plates 7b, 7b'. ' through the cylinder tube 7a.
By selectively supplying pressurized oil therein, it is moved forward and backward relative to the vertical axis X-X'. The tips of the piston rods 9, 9' are pivotally connected to the rear ends 1a, 1a' of the arms 1, 1', respectively, via pins 10, 10'. In addition, each vertical hole 5 is provided on the outer surface of the side plates 3, 3.
A cover 11 having a concave cross section and having a longitudinal groove 12 formed on the inner surface with both ends 12a and 12b open and covering the entire length of the cover 11 is attached with bolts 13. A portion 6b of the outer surface of each guide 6 is engaged with the inner surface 11a of each cover 11 to prevent each guide 6 from slipping out of the longitudinal hole 5. Further, on the cylindrical wall of the hydraulic cylinder 7, square frame-shaped half-split detent bodies 14a, 14b are fixedly installed, the vertical side edges 14c of which are in sliding contact with the inner surfaces of the side plates 3, 3. That is, the upper and lower outer peripheral surfaces of the cylinder tube 7a are provided with sandwiching members 15a and 1.
5b, 16a, 16b are welded 17 at intervals in the circumferential direction, and can be freely inserted and removed from both sides of the upright member 19 held in the groove 18 along the cylinder axis direction formed between the sandwich members 15a, 15b. The upper end flange portions 14d of the detent bodies 14a and 14b are fastened with the bolts 21a and nuts 21b with the shims 20 interposed, and the flange portions 14d protrude into the grooves 22 formed between the sandwich members 16a and 16b along the cylinder axis direction. By screwing 24 the receiving frame 23 holding the strip 23a from the lower side of the cylinder tube 7a to the lower end 14e of the detents 14a, 14b, the detents 14a, .
14b is fixed to the outer periphery of the cylinder tube 7a, and each vertical side edge 14c of the detent body 14a, 14b is abutted against the inner surface of each side plate 3 to prevent rotation around the piston rod. The position of each vertical side edge 14c of each detent body 14a, 14b with respect to the inner surface of each side plate 3 is adjusted by inserting and removing a shim 20. Further, the side plates 3, 3 are fixed to a rotating plate 16, and the rotating plate 16 is attached to a support plate 17 so as to be freely rotatable around an axis. A bracket member 18 having mounting holes 19 and 20 is fixed to this support plate 17. Mounting hole 19 of bracket member 18
For example, the tip of the arm 21 of a boom of a movable crushing machine (not shown) is pivotally attached via a pin 22, and the attachment hole 20 and the arm 21 of the boom are provided with a Connecting links 26 and 27 pivotally connected to the tip pin 25 of the piston rod 24 of the hydraulic cylinder 23 are connected to the pin 2.
8 and 29, respectively, and the working angle of the side plates 3, 3, that is, the arms 1, 1' is set by the expansion and contraction of the piston rod 23. Also, the piston 9a of the piston rod 9, 9',
9a' are stoppers 7e, 7e', and 7 in the hydraulic cylinder 7 that do not block the pressure oil ports 7c, 7d, and 7d'.
It is reciprocated between f and 7f', respectively. Further, it is preferable to provide a pressure equalizing pipe (not shown) in order to equalize the pressure of the pressure oil supplied into both piston chambers 30, 30' of the hydraulic cylinder 7 from the pressure oil ports 7d, 7d'.

To explain the operation of crushing the reinforced concrete structure A using the above device, first, the piston rods 9, 9' are retracted by the hydraulic cylinder 7, and the arms 1, 1' are opened as shown by solid lines in Fig. 1. Then, by operating the arm 21 and hydraulic cylinder 23 of the crushing boom, the crushing blades 2 of the arms 1 and 1'
The object A to be crushed is positioned at the center between a and 2a'. Next, the piston rods 9, 9' are extended by the hydraulic cylinder 7 to close the arms 1, 1' as shown by chain lines 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 the concrete part is destroyed, the internal reinforcing steel
A'' is exposed. Retract the piston rods 9, 9' again and open the arms 1, 1' so that the exposed reinforcing bar is located at the center between the shearing blades 2b, 2b'. In this state, the piston rod 9 , 9' are extended and the exposed reinforcing bars are cut with the shearing blades 2b, 2b'.

In addition, in the above embodiment, the crushing blades 2, 2' are
Although a description has been given of a device equipped with crushing blades 2a, 2a' and shearing blades 2b, 2b', the present invention can also be practiced with a crushing device equipped only with crushing blades or a cutter equipped only with shearing blades. Further, the vertical hole 5 and the trunnion pin 8 do not need to be provided in the center of the hydraulic cylinder 7 as in the illustrated example. For example, by placing the hydraulic cylinder 7 in the illustrated position, the vertical hole 5 and the trunnion pin 8 The present invention can also be carried out even if the cylinder 7 is provided offset to the left or right from the center.
Furthermore, the hydraulic cylinder 7 is not limited to the one in which the detent bodies 14a and 14b are provided around the entire circumference as shown in the figure, but it is also possible to provide the detent bodies 14a and 14b on either one of the cylinders 7 and 14b. The structure of the rotation stopper may be arbitrary as long as it prevents rotation around the rod, and for example, it can be implemented by directly welding a square plate or the like to the outer peripheral surface of the cylinder tube 7a.

(Effects of the Invention) Since the present invention has the above configuration, the hydraulic cylinder 7 is prevented from rotating around the piston rods 9 and 9' by the rotation prevention bodies 14a and 14b, so the trunnion pin 8 is 6 into the vertical hole 5, and there is no fear of it falling out of the vertical hole 5 due to irregular swinging of the hydraulic hose. In addition, concrete debris that has entered between the cover 12 and the end face of the trunnion pin 8 should be removed from the vertical groove 1 of the cover 12.
2 and fall under its own weight through the vertical groove 12, or from the downward opening 12a of the longitudinal groove 12, or when the arms 1, 1' are at an upward working angle, the other end opening 12 is downward, so it is immediately released from there. This prevents damage to the side plates, cover, and trunnion pins.

Further, in the present invention, the trunnion pin 8 is
If it is pivoted to a guide 6 having a rectangular cross section that is slidably fitted into each longitudinal hole 5, the guiding operation of the trunnion pin 8 by the longitudinal hole 5 can be made smoother.

[Brief explanation of drawings]

The drawings show an embodiment of the device of the present invention, and FIG. 1 is a side view, FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. 3 is a sectional view taken along the line - in FIG. 2. be. 1, 1'... Arm, 3... Side plate, 5... Vertical hole, 6... Guide, 7... Double-acting hydraulic cylinder,
8...Trunion pin, 9,9'...Piston rod,
11...Cover, 12...Vertical groove, 14a, 14
b... Rotating body.

Claims (1)

[Scope of Claims] 1. The intermediate portion of a pair of arms having crushing blades is pivotally connected between parallel side plates, and a vertically long hole is formed in each side plate along the vertical axis direction, and each vertically long hole is provided with: A trunnion pin protruding from the cylinder wall of a double-acting hydraulic cylinder that intersects with the vertical axis direction is slidably pivoted, and a pair of piston rods inserted into this hydraulic cylinder from both sides are connected to the rear ends of each of the arms. In the crushing device which is pivotally connected to the hydraulic cylinder, a cover is attached to the outer surface of the vertically elongated hole of each of the side plates, the cover having a longitudinal groove formed on the inner surface with both ends open to cover the entire length of each of the vertically elongated holes; The anti-rotation body fixed to the cylinder wall of
A crushing device in which the inner surface of each of the side plates is stopped to prevent rotation of the piston around the rod. 2. The crushing device according to claim 1, wherein a trunnion pin protruding from the cylindrical wall of the hydraulic cylinder is pivotally connected to a guide having a square cross section that is slidably fitted into a longitudinal hole in each side plate.