JPH08319637A - Attaching-detaching device for counterweight - Google Patents

Abstract

PURPOSE: To simplify the structure of a counterweight attaching-detaching device for an industrial vehicle and lighten the counterweight detachable device, and to load a counterweight on a frame. CONSTITUTION: This device consists of a hydraulic cylinder 10, in which a base end section is fitted rotatably to a first pin 11 (a center is represented by (x)) at the rear end section of a car body frame 1 and a front end section to a counterweight 20, a link 12, in which one end section is installed rotatably to a second pin 13 (a center is represented by (y)) at the rear end section of the car body frame 1 and the other end section to the counterweight 20, and the counterweight 20 rotatably set up to a third pin 14 (a center is represented by (z)) connecting the front end section of the hydraulic cylinder 10 and the other end section of the link 12. Lines tying the centers (x), (y) and (z) of each pin 11, 13 and 14 form a triangle at all times during a time when the counterweight 20 is removed from a car-body loading place to a specified place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight attaching / detaching device for industrial vehicles such as hydraulic excavators or cranes.

[0002]

2. Description of the Related Art Many proposals have been made for a counter weight attaching / detaching device for an industrial vehicle, but representative examples thereof are Japanese Utility Model Laid-Open No. 3-23186 and Japanese Utility Model Laid-Open No. 4-33758.

In Japanese Utility Model Laid-Open No. 3-23186, as shown in FIG. 6, a chain sprocket 43 is attached to the tip of a rod 42 of a hydraulic cylinder 41 whose base end is attached to the rear end of a vehicle body 40. There is. The chain 44 has one end attached to the vehicle body 40 and the other end attached to the counterweight 45 via a chain sprocket 43. In the above description, when the hydraulic cylinder 41 is extended, the counterweight rises as shown, and when the hydraulic cylinder 41 is shortened, the counterweight 45 descends. The counterweight 41 is fastened to the vehicle body 40 from the side surface with bolts (not shown) or the like in a raised state.

In Japanese Utility Model Laid-Open No. 4-33758, as shown in FIG. 7, a lever 51 is swingably attached to a rear end of a vehicle body 50 by a pin 52. A lower end of the lever 51 is connected to a rod 54 of a hydraulic cylinder 53 having a rear end portion and a base end portion attached to a lower surface of the vehicle body 50, and an upper end thereof is connected to an upper portion of a counterweight 56 by a pin 55. In the above structure, when the hydraulic cylinder 53 is extended, the counter weight 56 rises as shown by the solid line in the figure, and the hydraulic cylinder 5
When 3 is shortened, the counterweight 56 descends as shown by the thin two-dot chain line. The Ucanter weight 56 is fastened to the vehicle body 50 from the side by bolts or the like (not shown) in the raised state.

[0005]

However, the above structure has the following problems. Actual Kaihei 3-231
According to Japanese Patent Publication No. 86, the counterweight, which is positioned in close contact with the rear part of the vehicle body, is hung by a chain, so that it is difficult to stack the counterweight when mounting it on a truck. In addition, the counterweight is fastened to the vehicle body from the side surface with bolts or the like, which impairs the appearance.

In Japanese Utility Model Laid-Open No. 4-33758, a bending moment is generated in the lever when the counterweight is moved up and down, so that the device needs to be large in size, the weight of the device is heavy, and the cost is high. When connecting the counter weight and the lever placed on the ground or another place, it is very difficult to align the position and it takes a lot of time. Further, the counterweight is fastened to the vehicle body from the side surface with bolts or the like, which impairs the appearance.

The present invention has been made by paying attention to the above-mentioned problems, and it is easy to connect the counterweight and the attaching / detaching device and to mount the counterweight on the truck, and the structure is simple, the cost is low, and the appearance is good. It is an object of the present invention to provide a counterweight attaching / detaching device that is not damaged.

[0008]

In order to achieve the above object, in a counterweight attaching / detaching device according to the present invention, a working machine is provided at a front portion of a body frame 1, and a counterweight 20 and its attaching / detaching portion are provided at a rear portion. An industrial vehicle equipped with the device, wherein a base end portion is rotatably attached to a first pin 11 (centered at x) of a rear end portion of the vehicle body frame 1, and a tip end portion is rotatably attached to a counterweight 20. A link in which the attached hydraulic cylinder 10 is rotatably attached to the second pin 13 (centered at y) at the rear end of the vehicle body frame 1 and the other end to the counterweight 20. 12 and a counterweight 20 rotatably attached to a third pin 14 (centered at z) connecting the tip of the hydraulic cylinder 10 and the other end of the link 12 to each other. Pins 11 and 13 During the 14 center x, y, a line the counterweight 20 connecting the z from the vehicle mounting position to detach at a predetermined position is always configured so as to form a triangle.

Further, in the above structure, each of the pins 1
When the counterweight 20 is mounted on the vehicle body, the positions of the centers 1, 3, and 14 of x, y, and z are set to the center of the third pin 14 z.
The center y of the second pin 13 of the vehicle body frame 1 to which one end of the link 12 is attached is located rearward with respect to the perpendicular line passing through, and the center x of the first pin 11 to which the base end of the hydraulic cylinder 10 is attached.
Is located behind the center y of the second pin 13.

Further, in the above structure, the third pin 1
The four centers and the counterweight 20 are connected by a connecting member (33) whose length and position can be adjusted.

[0011]

With the configuration as described above, the bending moment is not applied to the link, and the weight of the device can be reduced. Further, since the counterweight is separated from the frame when descending, it can be easily mounted on a truck, and the counterweight placed on the ground or another place can be easily connected to the lever. The counterweight can be fastened to the vehicle body from below with bolts.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a counterweight attaching / detaching device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing a partial cross section of a first embodiment of a counterweight attaching / detaching device. A base end portion of the hydraulic cylinder 10 is rotatably attached by a first pin 11 to a pin hole whose center is x provided at the rear end of the vehicle body frame 1. One end of a link 12 is rotatably attached by a second pin 13 to a pin hole whose center is y and which is located at a position different from the pin hole whose center is x provided in the vehicle body frame 1. The third pin 14 rotatably connects the pin hole having the center of the tip of 10 to z and the pin hole having the center of the other end of the link 12 to z. Further, the third pin 14 and the bracket 21 provided on the upper portion of the counterweight 20 are rotatably connected.

The second pin center y is located a distance a behind a perpendicular line Y-Y passing through the third pin center z, and the first pin center x is located a distance b behind the second pin center y. ing. Therefore, the line connecting the second pin center y and the third pin center z is inclined forward by an angle α with respect to the perpendicular line Y-Y, and the line connecting the respective pin centers x, y, z forms a triangle. .

A front mounting seat 2 and a rear mounting seat 3 are provided in the rear portion of the frame 1 in a stepped state, on which stepped front seats 22 and rear seats 23 provided on the counterweight 20 are mounted. Bolts 4 and 5 from below
It is fastened by. At this time, the hydraulic cylinder 10 is in the expanded state.

When the hydraulic cylinder 10 is shortened, the link 12
2 rotates about the second pin 13 as shown by an arrow as shown in FIG. 2, and the counterweight 20 is lowered to the ground. At this time, the position of the center z of the third pin 14 is set to be always above the extension line connecting the center x of the first pin 11 and the center y of the second pin 13 even when the hydraulic cylinder 10 is most shortened. Has been done. During this time, the link 12 receives only a compressive force and a tensile force but no bending force. Therefore, the weight of the device can be reduced. Also,
Since the counterweight 20 is lowered apart from the rear end of the frame 1, loading on a truck can be easily performed.

FIG. 3 shows the front mounting seat 2 and the rear mounting seat 3 at the rear of the frame 1 and the front seat 2 of the counterweight 20.
It is a figure which shows the relationship with 2 and the rear seat 23. Link 1
2 is tilted forward by an angle α, and the counterweight 20 is mounted on the frame 1, the third pin center z
The horizontal line passing through is XX. Link 12 to second pin 1
The third pin center z is above the horizontal line X-X until it reaches the position of the angle -α by rotating about 3, and the maximum value thereof is c. Therefore, the counter weight 20
Becomes higher than the mounting position while moving from the angle α to −α, and it is possible to transfer even a structure in which the bolts 4 and 5 are tightened from below.

Let L1 be the horizontal movement distance of the third pin center z when the link 12 is inclined from the angle α to −α. When the counterweight 20 is mounted on the frame 1, the distance from the front end of the front seat 22 of the counterweight 20 to the rear end of the front mounting seat 2 of the frame 1 is set to L2, and the front end of the rear seat 23 of the counterweight 20 is set. When the distance from to the rear end of the rear mounting seat 3 of the frame 1 is L3, it is determined that L1> L2 and L1> L3. That is, while the counterweight 20 moves the distance L1, as shown by the thin two-dot chain line, the counterweight 20
Does not interfere with the front mounting seat 2 and the rear mounting seat 3 of the frame 1.

FIG. 4 is a side view showing a partial cross-section of a second embodiment of the counterweight attaching / detaching device, and FIG. 5 is a view taken in the direction of arrow A in FIG. FIG. 4 shows a state in which the counterweight 24 is lowered to the ground. The first joint 30 is attached to the third pin 14 at the tip of the link 12 so as to be rotatable in the front-rear direction. A pin 25 is welded to the side surface of the counterweight 24, and a second joint 31 having an elongated hole 32 is attached so as to be rotatable in the front-rear direction. The first joint 30 and the second joint 31 are connected to the pins 34, 35 via the turnbuckle 33.
And are rotatable with respect to the turnbuckle 33 in the left-right direction. Therefore, the second joint 3
The position of the one elongated hole 32 can be adjusted in the front-rear direction and the left-right up-down direction. Therefore, since the counterweight 24 installed on the ground and the third pin 14 of the link 12 are connected, they can be connected if the mutual positions are brought close to each other when the vehicle body is moved and aligned, and the operation is easy. can do.

In the above example, a flexible member such as a chain or a wire may be used at the connecting portion between the first joint 30 and the second joint 31.

[0020]

Since the present invention is configured as described above,
The structure is simple and the weight is light, and it can be fastened from the bottom with bolts so that it does not spoil the appearance. Further, it is possible to obtain a counterweight attaching / detaching device that can be easily loaded onto a truck and can be easily connected to the counterweight and the attaching / detaching device.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of a first embodiment of an attachment / detachment device of the present invention.

FIG. 2 is a side view showing a state where the counter weight is descending.

FIG. 3 is an explanatory diagram showing a positional relationship between a frame and a counter weight.

FIG. 4 is a side view showing a partial cross section of a second embodiment of the attachment / detachment device of the present invention.

FIG. 5 is a front view of the same.

FIG. 6 is a side view of a first example of a conventional attaching / detaching device.

FIG. 7 is a side view of a second example of a conventional attaching / detaching device.

[Explanation of symbols]

1 ... Frame, 2 ... Front mounting seat, 3 ... Rear mounting seat, 10
... hydraulic cylinder, 11 ... first pin, 13 ... second pin, 1
4 ... 3rd pin, 12 ... Link, 20, 24 ... Counterweight, 22 ... Front seat, 23 ... Rear seat, 30 ... 1st joint, 31 ... 2nd joint, 33 ... Turn buckle.

Claims (3)

[Claims] 1. An industrial vehicle equipped with a working machine in the front part of a body frame (1) and a counterweight (20) and its attaching / detaching device in the rear part of the body frame (1), the base end of which is the body frame.
(1) A hydraulic cylinder (10) rotatably attached to the first pin (11) (centered as x) at the rear end of the rear end and a counterweight (20) at the front end, and one end The body frame (1)
To the second pin (13) at the rear end (center is y), and
The link (12) having the other end rotatably attached to the counterweight (20), the tip of the hydraulic cylinder (10) and the link (1).
A counterweight (20) rotatably attached to a third pin (14) (centered at z) connected to the other end of 2), and each of the pins (11, 13, 14) Attachment / detachment of the counterweight, characterized in that the line connecting the centers x, y, z is configured to always form a triangle until the counterweight (20) is removed from the vehicle body mounting position to a predetermined position. apparatus. 2. The position of the center x, y, z of each pin (11, 13, 14) is perpendicular to the center z of the third pin (14) when the counterweight (20) is mounted on the vehicle body. Link to (12)
The center y of the second pin (13) of the body frame (1) attached to one end of is located rearward, and the center x of the first pin (11) attached to the base end of the hydraulic cylinder (10) is 2nd pin (13) center y
The counterweight attaching / detaching device according to claim 1, wherein the counterweight attaching / detaching device is located further rearward. 3. A connecting member (3) capable of adjusting the length and position of the center of the third pin (14) and the counterweight (20).
The counterweight attaching / detaching device according to claim 1 or 2, which is connected by 3).