Tree shearing and grabbing edging cutting board for excavator

Abstract

Knife boards are respectively installed on two sides of a tree shear claw and are arranged in a crossed mode, the knife boards are right-angle knife boards, one side of each knife board is fixedly installed with a knife handle, the cambered surface of the front end of each knife board is a knife face, each knife face is composed of two parts, namely a positive arc-shaped knife face and a reverse arc-shaped knife face, and each reverse arc-shaped knife face is used for holding and grabbing branches. When cutting is carried out, the reverse arc-shaped blade faces hold branches and are matched with the arc faces of the branches, cutting is convenient, large thick and hard branches can be easily cut, the tree scissors are not prone to shaking, force exerting is stable, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, and particularly relates to a tree shear grabbing and opening-edge knife plate for an excavator. Background Art

[0002] Traditional tree shears for excavators include a knife handle and a blade connected to the front end of the knife handle. The two blades are arranged crosswise at the front end and hinged at the tail. The existing blade surface is composed of two smooth blade surfaces, two toothed blade surfaces, or one smooth blade surface and the other toothed blade surface. This tree shear is only suitable for shearing smaller branches. When the branches to be sheared are thick and hard, the tree shear is prone to shaking, and the user cannot apply force smoothly, which is very laborious. Summary of the Invention

[0003] In order to solve the above technical problems, the utility model provides a tree shear grabbing and opening-edge knife plate for an excavator, and its technical solution is as follows:

[0004] The knife plate includes a vertex O. Taking O as the vertex, respectively make right-angle sides OA and OB, and ∠AOB = 90°. Taking OA as the side, a number of mounting holes are arranged at equal distances along the OA direction, and the mounting holes are in the shape of an inverted frustum of a cone;

[0005] AB is an arc structure, and the arc AB is the blade surface of the knife plate. This blade surface is composed of two parts, namely a positive arc blade surface and a reverse arc blade surface. The reverse arc blade surface holds and grabs the branch arc surface, which is convenient for shearing branches;

[0006] This knife plate is installed on the knife handle. The knife handle is provided with holes corresponding to the mounting holes of the knife plate and is installed and fixed by countersunk head screws;

[0007] There are two groups of knife plates, and they are arranged crosswise relatively.

[0008] Further, there are eight mounting holes on each group of knife plates, and the hole pitch is 40 mm.

[0009] Further, C is a point on OB, and OC = 44.5 mm. Make a perpendicular line to OC so that CD⊥OC. E is a point on the extension line of CD. Taking the vertex D as the center and the length of DE as the radius to draw an arc, ∠EDF = 85.12°, which is the degree of the positive arc blade surface.

[0010] Further, I is a point on DF. Taking the extension line G point of DF as the center and the length of GI as the radius to draw an arc, ∠GIH = 26.29°, which is the degree of the reverse arc blade surface.

[0011] The beneficial effects of the present utility model are as follows: The present utility model is a cutting-edge knife plate for a tree shear grab of an excavator. Knife plates are respectively installed on both sides of the tree shear grab and are arranged crosswise. The knife plate is a right-angle knife plate. One side of the knife plate is fixedly installed with a knife handle, and the front arc surface is a cutting edge surface. The cutting edge surface is composed of two parts, namely a positive arc cutting edge surface and a reverse arc cutting edge surface. The reverse arc cutting edge surface is used to hold and grab branches. When cutting, the reverse arc cutting edge surface holds and grabs the branches, fitting with the arc surface of the branches, facilitating cutting, and being able to easily cut even relatively thick and hard branches. The tree shear does not easily shake, the force application is stable, and it saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is Figure 1 a side view;

[0014] Figure 3 is Figure 1 a schematic structural diagram applied in a tree shear;

[0015] Figure 4 is Figure 3 a schematic structural diagram after operation;

[0016] Figure 5 is Figure 3 a side view;

[0017] Figure 6 is Figure 5 a partial enlarged view;

[0018] As shown in the figure, 1 is an excavator connection frame, 2 is a box body assembly, 3 is a left rotary oil cylinder driving device, 4 is a left claw welded part, 5 is a countersunk head screw, 6 is a cutting-edge knife plate, 7 is a right claw welded part, 8 is a right rotary oil cylinder driving device, 9 is a mounting hole, and 10 is a branch. DETAILED IMPLEMENTATION MANNER

[0019] As shown in the figure, the present utility model is a cutting-edge knife plate for a tree shear grab of an excavator. The tree shear grab can be mechanically connected to the excavator through the excavator connection frame 1 at the top, and the hydraulic working oil pipe passes through the middle hole and is connected to the excavator.

[0020] The excavator connecting frame 1 (1 piece) is connected and installed with the lower box body assembly 2 (1 piece). The left rotary oil cylinder driving device 3 (1 piece) and the right rotary oil cylinder driving device 8 (1 piece) are installed on the box body assembly 2, which can drive the left claw welded part 4 (1 piece) and the right claw welded part 7 (1 piece) to rotate inwards or outwards simultaneously. The left claw welded part 4 and the right claw welded part 7 are respectively composed of a tool handle and a sharpened knife plate. At the tool handle part on the inner side of the inner end of the left claw welded part 4, 8 countersunk head screws 5 are used to install the tree shear grab sharpened knife plate 6 of the present utility model. Another tree shear grab sharpened knife plate 6 (2 groups) of the present utility model is fastened and installed at the tool handle part on the outer side of the inner end of the right claw welded part 7 by 8 countersunk head screws (a total of 16 countersunk head screws for the two sharpened knife plates). The two tree shear grab sharpened knife plates 6 installed on the left and right are exactly the same, which is convenient for processing, and only the installation direction and position are different.

[0021] As Figure 1 and Figure 2 shown, the knife plate includes the vertex O. Taking O as the vertex, the right-angled sides OA (OA = 321.73 mm) and OB (OB = 349.55 mm) are respectively made, and ∠AOB = 90°. Taking OA as the side, eight mounting holes 9 are arranged at equal distances along the OA direction, and the hole pitch is 40 mm. And the mounting holes are of an isosceles inverted frustum structure; AB is an arc structure, and the arc AB is the cutting edge surface of the knife plate. This cutting edge surface is composed of two parts, namely a positive arc cutting edge surface and a reverse arc cutting edge surface. The reverse arc cutting edge surface holds the tree branch arc surface, which is convenient for shearing branches; this knife plate is installed on the tool handle, and the tool handle is provided with holes corresponding to the mounting holes of the knife plate and is installed and fixed by countersunk head screws. According to the actual situation, the cutting edge surfaces of the two knife plates can be smooth cutting edge surfaces, toothed cutting edge surfaces, or one smooth cutting edge surface and the other toothed cutting edge surface. The present utility model has two smooth cutting edge surfaces.

[0022] The knife plates are in two groups and are arranged in a relatively crossed manner. The two tree shear grab sharpened knife plates 6 of the present utility model after installation are 5 mm apart (as Figure 6 shown).

[0023] C is a point on OB, and OC = 44.5 mm. Make a perpendicular line to OC so that CD⊥OC and CD = 20 mm. E is a point on the extension line of CD. Taking the vertex D as the center and the length of DE as the radius to draw an arc, ∠EDF = 85.12°, which is the degree of the positive arc cutting edge surface.

[0024] I is a point on DF. Taking the extension line G point of DF as the center and the horizontal distance from G to the extension line of CD as 433.39 mm, and taking GI as the radius to draw an arc, ∠GIH = 26.29°, which is the degree of the reverse arc cutting edge surface.

[0025] The working principle of the present utility model:

[0026] After the tree shear grab is connected to the excavator, the excavator can be operated to make the tree shear grab with the claw tips facing forward, the cutting blade plates 6 horizontal and at the lowest position, and close to the ground. This working position is the required working position. By operating the excavator to control the oil flow direction of the hydraulic working oil pipes of the tree shear grab, the left and right rotary cylinder drive devices can be simultaneously rotated inward or outward, so as to realize the synchronous inward or outward rotation of the left claw welded part 4 and the right claw welded part 7 (the maximum rotation angle is 110°). When rotating inward, the left claw welded part 4 and the right claw welded part 7 simultaneously deflect toward the center position to realize clamping. The cutting edges of the two cutting blade plates 6 gradually approach to realize shearing and extrusion. The designed curved cutting edge can ensure that a single soft tree with a diameter of 30 cm can be cut off at one time during a single operation (the left and right cutting blade plates 6 have each cut more than half) and grabbed (see the attached drawings). When rotating outward, the left claw welded part 4 and the right claw welded part 7 simultaneously deflect outward from the center position to realize the opening of the cutting blade plates 6, and the cutting edges of the two cutting blade plates 6 gradually move away to realize the preparation working position for placing or the next tree shearing operation.

[0027] The utility model relates to a cutting blade plate of a tree shear grab for an excavator. Cutting blade plates are respectively installed on both sides of the tree shear grab and are arranged crosswise. The cutting blade plates are right-angle cutting blade plates. One side of the cutting blade plate is fixedly installed with a knife handle, and the front arc surface is a cutting surface. The cutting surface is composed of two parts, namely a positive arc cutting surface and a reverse arc cutting surface. The reverse arc cutting surface is used for grabbing branches. When shearing, the reverse arc cutting surface grabs the branches and fits with the branch arc surface, which is convenient for shearing. Moreover, even for relatively thick and hard branches, they can be easily sheared. The tree shear is not easy to shake, the force is stable, and it saves time and effort.

[0028] Although the embodiments of the present invention have been shown and described above, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tree shear and grab opening blade plate for an excavator, the blade plate comprising a vertex O, characterized in that, Take O as the vertex to respectively make the right-angled sides OA and OB, and ∠AOB = 90°. Take OA as the side, and arrange a number of mounting holes at equal distances along the OA direction, and the mounting hole (9) is in the shape of an inverted truncated cone; AB is an arc-shaped structure, and the arc AB is the blade surface of the knife plate. This blade surface consists of two parts, namely a positive arc blade surface and a reverse arc blade surface. The reverse arc blade surface holds and grabs the branch arc surface to facilitate shearing branches; This knife plate is installed on the knife handle. There are holes corresponding to the mounting holes of the knife plate on the knife handle, and it is installed and fixed by countersunk head screws (5); There are two groups of knife plates, and they are arranged relatively and crosswise.

2. The tree-shearing and grabbing open-edge knife plate for an excavator according to claim 1, wherein, There are eight mounting holes on each group of knife plates, and the hole pitch is 40 mm.

3. The tree shear grab opening blade plate for an excavator according to claim 1, characterized in that, The blade surface of the said knife plate is a smooth blade surface, a toothed blade surface or a combination of a smooth blade surface and a toothed blade surface.

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