JPH04153468A - Crusher - Google Patents

Abstract

PURPOSE:To enable a crushing force and a holding force to be increased by fitting links pivotally on the left and right of 8 device main-body, to fit opening or closing arms at the one-ends of the links and to fit a first hydraulic cylinder on a section between the upper sections of the opening or closing arms, and by fitting a second hydraulic cylinder on a section between the other ends of the links. CONSTITUTION:On a crusher main-body 2, a pair of links 4 are pivotally fitted with pins 5. After that, at the lower sections of the respective links 4, opening or closing arms 6 are fitted to be freely opened or closed with pins 7 as centers. After that, a first hydraulic cylinder 8 for opening or closing the opening or closing arms 6 is connected to the upper sections of the opening or closing arms 6 with pins 9, 9. Besides, on a section between the other ends of the links 4, a second hydraulic cylinder 10 is fitted with pins 11. When an object to be crushed is forced to be crushed with the force of F2 by moving the opening or closing arms 6 rotationally with the pins 7 as centers with the force of F1 clue to the elongation of the first cylinder 8, then a force F3 to an external side is worked on the pins 7, and the force is reversed by the links 4, and the compressive force of F4 is worked on the second hydraulic cylinder 10.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an opening/closing type crushing device used for building construction, road crushing, dismantling structures such as automobiles, or grasping and transporting wood, etc. This invention relates to a device having means for changing the opening width of the arm.

(Prior Art and Problems to be Solved by the Invention) Among conventionally known opening/closing type crushing devices, one in which the opening width of the opening/closing arm can be changed is disclosed in Japanese Utility Model Application No. 56-122479. This means that one end of a hydraulic cylinder is connected to the pivot point of one opening/closing arm, and the other end of the hydraulic cylinder is the pivot point of the other opening/closing arm. The opening and closing arm is opened and closed by a separate hydraulic cylinder.

According to this known structure, when performing crushing work, a large tensile force is applied to the hydraulic cylinder that changes the interval between the pivot points of the opening and closing arm, and the hydraulic pressure on the piston rod side rises by J-. The problem is that it cannot absorb a large amount of crushing force and cannot obtain a large crushing force. Also, since it is necessary to install a large hydraulic cylinder between the pivot points of the opening/closing arm,
The problem is that the crushing equipment must be large and heavy, making it difficult to implement.

The present invention has been made in view of these problems, and an object of the present invention is to provide a crushing device that can easily obtain large crushing force and gripping force.

(Means for Solving the Problems) In order to achieve this object, the present invention provides links that are pivotally connected to each other by a pair of pins on the left and right sides of the crushing device main body, and that can be opened and closed at one end of the link with the pins as the center. The arm is attached to be openable and closable, a first hydraulic cylinder for opening and closing the arm is attached between the -L portions of both the opening and closing arms, and a second hydraulic cylinder for rotating the link is attached between the other ends of the two links. It is characterized by having a .

(Function) Since the crushing device according to the present invention has the above-described structure, the distance between the pivot points of the opening/closing arm with respect to the link changes by the expansion and contraction of the second hydraulic cylinder, and the opening width of the opening/closing arm changes. do. In addition, in the prior art, the rotation center of the opening and closing arm is a pin that pivotally connects the opening and closing arm to the crusher main body, or in the present invention, the rotation center of the opening and closing arm is located closer to the tip of the opening and closing arm than the pivot pin. (on the nail side)
This can be done by increasing the strength of your toes.

(Example) Fig. 1 is a side view of an embodiment of the crushing apparatus according to the present invention, and Figs. 2 and 3 are A-A and B= of Fig. 1, respectively.
-B sectional view. In Figures 1 to 3, ■ is a bracket attached to the arm of the working machine, 2 is a crushing device main body formed by combining parallel plates attached via a rotating device 3, and 4 is a crushing device body connected to the main body 2 by a pin 5. A pair of links are pivotally connected, 6 is an opening/closing arm attached to the lower part of each link so that it can be opened and closed about a pin 7, 8 is a first hydraulic cylinder for opening and closing the opening/closing arm 6, and both ends of the opening/closing arm 6 are connected to the pin 7. 9
．． 9 is connected to the opening/closing arm 6. 10
is a second hydraulic cylinder mounted between the upper ends of the link 4.4 with both ends thereof connected by a pin 11. The links 4.4 are provided on both sides of the hydraulic cylinder 10 as shown in FIG. A pin 7 that connects and pivotally connects the opening/closing arm 6 to the link 4 and a pin 11 that connects the hydraulic cylinder 10 are connected to and penetrate through the lower and upper portions of the links 4.4 at both ends, respectively.

FIG. 4 shows an example of a hydraulic circuit applied to the crushing device of this embodiment, and includes control valves 15.14 corresponding to the first and second hydraulic cylinders 8.10, respectively. 16.
Reference numeral 17 indicates a hydraulic power source and an oil tank mounted on the main body of the work machine. By operating the control valve 14 of the second hydraulic cylinder 10, the amount of expansion and contraction of the second hydraulic cylinder IO is adjusted, thereby adjusting the opening width of the opening/closing arm 6, and by operating the control valve 15, the opening width of the opening/closing arm 6 is adjusted. The claws 6a are used to crush, grasp, and release the parts by opening and closing them.

Here, as shown in Fig. 4, the second hydraulic cylinder ■0
The distance a between the connection point between the link 4 and the link 4 (the center of the pin 11) and the pivot point of the link 4 with respect to the main body 2 (the center of the pin 5) is
If the distance between the pivot point and the pivot point (the center of the pin 7) for the link of the opening/closing arm 6 is wider ((a>b), then the distance between the pivot point and the pivot point (the center of the pin 7) for the link of the opening/closing arm 6 is set by the second hydraulic cylinder 10 according to the lever principle. Even if an opening/closing force larger than the opening/closing force (a force larger by the ratio of a/b) acts on the pivot point (pin 7), this may be affected. The diameter can be made smaller accordingly.

Furthermore, in the prior art, since the opening/closing arm 6 is rotated around the pivot pin 5 to the main body 2, the opening/closing arm 6 is rotated around the pivot pin 5. It is difficult to approach the tip of the opening/closing arm 6 for the following reason. That is, the reason L-1 for increasing the opening width of the opening/closing arm 6 is that the pivot pins 5 are fixed with a wide interval, making it difficult to close the opening/closing arm 6 completely.

In order to completely close it, it is necessary that the distance between the pins 5 is not too wide. Therefore, the pin 5 is placed in a part of the opening/closing arm 6 that is not opened much, that is, near the middle of the opening/closing arm 6. had to be installed.

According to the structure of the strength tree invention, since the interval between the rotation center pins 7 of the opening/closing arm 6 can be widened and then gradually narrowed, the above-mentioned concerns are eliminated, and therefore, the rotation of the opening/closing arm 6 toward the tip of the opening/closing arm 6 can be made narrower. I hope to publish the center of motion soon, and the crushing force at the tip.''
I can get it.

In FIG. 1, due to the extension of the first hydraulic cylinder 8, F
When attempting to crush the object to be crushed by applying a force F2 by rotating the opening/closing arm 6 around the pin 7 with a force F2,
An outward force F3 acts on the pin 7, this force is reversed by the link 4, and a compressive force F4 acts on the second hydraulic cylinder lO. It is thought that the hydraulic pressure in the head chamber in the hydraulic cylinder 10 reaches 700 kg/ci+2 to 1000 kg/cm2, which can be withstood since the pressure is received in a stopped state. In addition, the product described in the above-mentioned Utility Model Application No. 56-122479 receives the crushing force by the bow tension of the hydraulic cylinder, so the crushing force is received in the lot chamber of the hydraulic cylinder with a narrow cross-sectional area. However, since there is no force-relaxation effect by the link 4 as in the present invention, this pressure becomes high and is difficult to realize.

The fifth [A] is another example of the hydraulic circuit of the present invention applied to the crushing device of the above embodiment, in which the second hydraulic cylinder 10 first performs an extension operation during the operation of crushing the object to be crushed, Thereafter, after the object to be crushed is gripped by the claws 6a, the second hydraulic cylinder 10 is stopped, and the first hydraulic cylinder 8 is extended to carry out the crushing operation.

That is, as shown in FIG. 5, if the connecting pin 9 between the first hydraulic cylinder 8 and the opening/closing arm 6
If the distance from the pivot pin 7 is C, and the distance between the pin 9 and the point receiving the reaction force of the object to be crushed is d, then if it is assumed that the first hydraulic cylinder 8 is stationary, the crushing force will be Due to the corresponding reaction force F2, the pin 9.
Approximately, if the point of application of the crushing force by 7 and the claw 6a is on the straight line 2, a compressive force of F4=F2X (b/a) x (d/c) will act. - force, if the second hydraulic cylinder 10 is stationary and the first hydraulic cylinder 8 extends to grasp the object to be crushed, then the first hydraulic cylinder 8 has the following force: FI=F2x ( The force (d-c)/c) acts. - For example, a:b=3:2
, c : d = 2 : 3, then Fl/F4=
l: 2, which is much smaller than the force acting on the first hydraulic cylinder 8 or the force acting on the second hydraulic cylinder IO; in other words, the force acting on the first hydraulic cylinder 8
If the second hydraulic cylinder 10 has the same diameter and applies the same pressure, the first hydraulic cylinder 8 will operate preferentially.

Therefore, in order to order the operation of the hydraulic cylinders 8.10, from the common control valve 18, a circuit 19.20 for the first hydraulic cylinder 8 and a circuit 19.20 for the second hydraulic cylinder lO
A pilot check valve 24 connected to the other circuit 22 by a pilot circuit 23 is connected to the circuit 21 to which pressure oil is supplied when the opening/closing arm 6 of the second hydraulic cylinder 10 is closed. The circuit 19 to which pressurized oil is supplied when the opening/closing arm 6 of the first hydraulic cylinder 8 is inserted and the opening/closing arm 6 of the first hydraulic cylinder 8 is closed is connected to a circuit 19 in which the object to be crushed is gripped by the extension of the second hydraulic cylinder 10 or the first hydraulic cylinder 8 is immobile. A sequence valve 25 is inserted, and a check valve 26 for opening the opening/closing arm 6 is connected in parallel to the sequence valve 25.

In this circuit, when the control valve 18 is switched to the left position and the opening/closing arm 6 is closed, the hydraulic pressure in the circuits 19 and 21 is low until the object to be crushed is gripped.
Without opening the sequence valve 23, the opening/closing arm 6 closes due to the extension of the second hydraulic cylinder 10.

When an object to be crushed is gripped by the claws 6a and pressed, the hydraulic pressure of the circuit 19 is +f1 and sequence 5 (2s is opened,
The first hydraulic cylinder 8 performs an extension operation, and the second hydraulic cylinder 10 remains stationary and receives most of the crushing reaction force. At this time, the pilot check valve 24 is
The hydraulic pressure in the second hydraulic cylinder 10 or the operating tool of the first hydraulic cylinder 8. IL prevents the flow from flowing backwards into the first hydraulic cylinder 8 even if it reaches L.

If the crushing (or grasping of the damaged object) is performed by such a combined operation of both the hydraulic cylinders 8 and 1O, the following effects can be obtained.

(1) As mentioned above, a large force acts on the second hydraulic cylinder 10, or the pressure is received by the head chamber in the stop state F, so it can withstand it.

(2) In the case of only the first hydraulic cylinder 8, the opening/closing width cannot be increased unless the distance C between pin 7 and pin 9 is made small, or if this is made small, C/(d-c) The crushing force becomes smaller and it becomes impossible to obtain a large crushing force. On the other hand, according to the mechanism of the present invention, since the opening width of the opening/closing arm 6 can be changed from large to small, the distance glc can be increased, and therefore the crushing force can be increased.

(Effect of the invention) According to claim J, it is also possible to change the interval between the rotation centers of the opening and closing arms from large to small, and by bringing this rotation center closer to the tip of the opening and closing arm, the crushing force can be applied. 1- I can get it. In addition, the second hydraulic cylinder receives pressure from the head side, and the second hydraulic cylinder receiving pressure can be reduced from the ratio of the lengths of the links.

According to the second aspect, since the second hydraulic cylinder receives the pressure in a stopped state, it can withstand a large crushing or gripping reaction force.

In addition, since the closing operation of the opening/closing arm is performed by the combined operation of the first and second hydraulic cylinders, the first
A large opening/closing width can be obtained with the hydraulic cylinder. Also,
Since the stroke of the first hydraulic cylinder can be made small, the first hydraulic cylinder does not get in the way of the work, the crushing device is lighter, and the ratio of the distance between the force points of the opening and closing arms is reduced. Since it does not decrease, the crushing force is reduced.

]　2

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the crushing device according to the present invention, FIGS. 2 and 3 are sectional views taken along A-A and B-B in FIG. 1, and FIGS. 4 and 5 are sectional views, respectively. These are inverted versions of the hydraulic circuit of the present invention. 2: Main body, 4: Link, 5.7.9.11: Pin, 6:
Opening/closing arm, 6a: Claw, 8: First hydraulic cylinder, work 0
: 2nd hydraulic cylinder, 14.15.18: Control valve, 24: Pilot check valve, 25 Nisken valve

Claims (1)

[Scope of Claims] 1. Links are pivotally connected to the left and right sides of the crushing device main body by pairs of pins, and each opening/closing arm is attached to one end of the link so as to be freely openable/closable about the pin, and the upper part of both opening/closing arms is attached to one end of the link. A crushing device characterized in that a first hydraulic cylinder for opening and closing an arm is installed between the links, and a second hydraulic cylinder for rotating the links is installed between the other ends of both the links. 2. A control valve common to the first and second hydraulic cylinders is provided, and a circuit for hydraulic oil to the first hydraulic cylinder,
A sequence valve that operates the first hydraulic cylinder after the second hydraulic cylinder is provided, and the hydraulic oil circuit to the second hydraulic cylinder is configured to open and close the second hydraulic cylinder by the reaction force of the claw when the opening/closing arm is closed. The crushing device according to claim 1, further comprising a pilot check valve that prevents the arm from operating in the opening direction.