JPH07150773A - Grip opening/closing link device - Google Patents

Abstract

PURPOSE:To enable fitting of a grip mechanism to an arm without special reinforcement in a grip device in which an arm tip shaft is adopted as a rotary shaft, by constituting a three-point link having a cylinder pressing point. CONSTITUTION:A grip device, in which one side or both are opened/closed by combination of grip claws or buckets 12, is opened/closed with a tip shaft 5 of an arm 10 as a rotary shaft. A link mechanism is constituted of a base link 1 for two-point support at a tip of the arm 10, a work link 2 for fitting of the bucket 12 or the like, an arm link 3 extended from a lower part to an upper part of the base link 1, and a three-point link 4 connecting an upper point of the arm link 3 to an upper point of the work link 2 and having a cylinder pressing point P thereunder. With this constitution, a sufficient cylinder stroke can be obtained without increasing a load onto the arm 10 main body, and required grip operation can be satisfactorily dealed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a grip opening / closing link device in a grip device in which a grip claw or a bucket opens and closes with an arm tip shaft as a rotation axis.

[0002]

2. Description of the Related Art In a power shovel for a construction machine, a gripping claw or a gripping mechanism for opening and closing a bucket of a power shovel is provided as it is, for the purpose of gripping a house or a dismantled object, and dismantling other materials. And a bending moment is applied to the arm. Therefore, since the use as it is will result in damage to the arm, and in particular, damage to the gripping claw or the pivot pin that pivotally supports the bucket, some kind of reinforcement that increases the weight load is applied to the tip of the arm. Was needed.

[0003]

In the case of normal bucket work, as shown in FIG. 8, the bucket cylinder force causes a counterclockwise moment in the arm.
On the contrary, a reaction force from the ground causes a moment in the clockwise direction, and the two cancel each other out. Therefore, the upper portion of the arm link 11 may be pushed by the bucket cylinder. However, if an attempt is made to allow the gripping operation by putting a grip on the bucket 12, reaction force from the soil will not be applied to the bucket 12, and an excessive counterclockwise moment due to the bucket cylinder will remain. Then, when the cylinder rod 14 pushes on the arm link 11, the load on the arm body increases. If the cylinder rod 14 pushes this in the middle of the arm link 11, the moment may be small, but the stroke cannot be taken and the cylinder rod 14 will immediately rest on the arm 10 and interfere, so this is also impossible. Is.

According to the present invention, when a gripping mechanism for opening and closing a gripping claw or a bucket is provided in place of a power shovel in a construction machine, a sufficient cylinder stroke can be obtained without increasing the load on the arm body.
An object of the present invention is to provide a grip opening / closing link device that can sufficiently cope with a required grip operation.

[0005]

[Means for Solving the Problems] As a result of examining the above problems,
In a gripping device in which one or both of which is opened / closed by a combination of a gripping claw or a bucket with the tip axis of the arm 10 as a rotation axis, a base link 1 supporting two points at the arm tip, a work link 2 for mounting a gripping claw, a bucket, etc. The grip opening / closing link device is composed of the arm link 3 extending from the lower side of the link to the upper side, and the three-point link 4 connecting the arm link upper point and the work link upper point and having the cylinder pushing point P below the arm link 3.

[0006]

With this structure, since the cylinder pushing point P of the three-point link 4 is pushed, it is possible to push below the arm link 3. Also, the bending moment applied to the arm is reduced. The effect of reducing the load per pin was obtained.

[0007]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a side view at the time of gripping. In this example, of the bucket 12 and the bucket receiver 15 that enable gripping, the bucket receiver 15 is fixed to the arm 10. Only the bucket 12 is pushed by the cylinder rod 14 and can swing.

The links for enabling the bucket 12 to swing are composed of four links: a base link 1, a work link 2, an arm link 3, and a three-point link 4. The base link 1 is an arm tip portion, and is a portion that supports one end side of the work link 2 and one end side of the arm link 3 at two points of shafts 5 and 6, respectively. In this example, the work link 2 pivotally supports the bucket 12 by the shaft 5 to the tip of the arm 10 and the tip of the three-point link 4 by the shaft 7. The arm link 3 is pivotally supported on the arm 10 by the shaft 6, and the upper point is pivotally supported on the top of the three-point link 4 by the shaft 8. The circles in each figure are link diagrams.

The three-point link 4, which is the most characteristic feature of the present invention, is an arm having a substantially triangular shape, and a cylinder rod 14 is connected to the remaining one of the triangles by a shaft 9 to form a pushing point P. . Because of this structure,
The cylinder push point P is below the top axis 8 of the three-point link 4. This state is almost the same when the bucket 12 in FIG. 1 is expanded and when the bucket 12 in FIG. 3 is swinging its head and an object is sandwiched between the bucket 12 and the bucket receiver 15. Even in the middle, the radius of the arc locus becomes larger than in the case of directly pushing the arm link, and the rocking of the cylinder can be almost eliminated at the position close to the upper surface of the arm. This will be described with reference to FIG. (a) is the case of the present invention in which the three-point link 4 is provided, and (b) is the case where the middle of the arm link 11 is pushed. The movement width of the cylinder rod 14 is 50
In the case of 0 mm, when the middle of the arm link is pushed as in (b), the radius of the arc locus is 250 mm, but in the present invention of (a) it is slightly
It's only 67mm.

With the structure of this embodiment, when the house is dismantled, the bucket receiver 15 is initially gripped, the soil on the wall and the mortar wall are broken, and the soil is scraped later. At this time, the bucket receiver 15 is useful for scraping, and the bucket is useful for holding the wall soil. You can also excavate the bucket by removing the bucket bridge 15.

4 and 5 show a second embodiment of the present invention,
It is a side view of a type in which both the bucket 12 and the bucket receiver 15 are movable. In this example, the bucket 12 is in the same connected state as in the first embodiment. In order to make the bucket receiver 15 movable, the base of the bucket receiver 15 is coaxially supported by the shaft 5 to the tip of the arm 10 coaxially with the bucket, and an arc-shaped driven link 16 is also provided near the base shaft support by the shaft 18. Further, when the operation lever 17 is fixedly provided near the center of the three-point link 4, the link 16 and the lever 17 are connected at the center, and the bucket 12 is pushed by the cylinder rod 14 to rotate, the bucket receiver 15 Is rotated in the opposite direction, so that it can be grasped.

FIGS. 6 and 7 show a third embodiment of the present invention,
Grasp claws instead of the bucket and bucket receiver of the second embodiment
This is an example in which 19a and 19b are provided. FIG. 6 shows a state in which the claw is opened, and FIG. 7 shows a state in which the claw is closed and an object is grasped. Also in this example, the use of the three-point link 4 does not increase the load on the arm body, allows the cylinder stroke to be sufficiently taken, and can sufficiently cope with the required gripping operation.

[0013]

Since the present invention has the above structure,
The gripping mechanism can be attached to the arm of an ordinary power shovel without special reinforcement, and it is lightweight and durable, and is economical.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment.

FIG. 2 is a plan view of the first embodiment.

FIG. 3 is a side view of the first embodiment at the time of gripping.

FIG. 4 is a side view of the second embodiment.

FIG. 5 is a side view of the second embodiment during gripping.

FIG. 6 is a side view of the third embodiment.

FIG. 7 is a side view of the third embodiment at the time of gripping.

FIG. 8 is a side view of a conventional example.

FIG. 9 is a diagram showing an operating state of a cylinder when pushed by a three-point link (a) and when pushing the middle of an arm link (b).

[Explanation of symbols]

 1 Base Link 2 Work Link 3 Arm Link 4 Three-Point Link 5 Axis 6 Axis 7 Axis 8 Axis 9 Axis 10 Arm 12 Bucket 14 Cylinder Rod 15 Bucket Receiver 16 Link 17 Lever 18 Axis 19a Grip Claw 19b Grip Claw

Claims (1)

[Claims] 1. A gripping device in which one or both of which is opened / closed by a combination of a gripping claw or a bucket with the tip end shaft of the arm 10 as a rotation axis is equipped with a base link 1, a gripping claw, a bucket, etc. which are supported at two points at the arm end. A grip opening / closing link including a work link 2, an arm link 3 extending from the lower side of the base link to an upper side, and a three-point link 4 connecting the arm link upper point and the work link upper point and having a cylinder pushing point P below the work link 2. apparatus.