CN221095247U - Double-cutter-head small arm of excavator - Google Patents

Abstract

The utility model discloses a double-cutter-head small arm of an excavator, which comprises a small arm and a cutter plate; the forearm includes: a small arm oil cylinder connecting hole, a large arm connecting hole and a knife board connecting hole; the knife board comprises: the cutter comprises a cutter plate and a tooth holder, wherein a connecting hole is formed in the cutter plate and connected with the forearm, a force unloading hole is formed in the middle of the cutter plate, and the tooth holders are arranged at two ends of the cutter plate. The utility model adopts the detachable pin shaft connection, solves the problem that the damaged parts cannot be replaced quickly after the front section of the existing forearm is damaged, and the two ends of the cutter plate can be replaced and installed, thereby reducing the shutdown maintenance time of the excavator and increasing the use efficiency of the excavator.

Description

Double-cutter-head small arm of excavator

Technical Field

The utility model relates to the technical field of engineering equipment, in particular to rock breaking equipment of an excavator.

Background

An excavator rock arm is a rock breaking device used to excavate rock. The large arm is connected with the excavator frame, the small arm is connected with the large arm, and the small arm directly participates in the rock breaking and excavating process.

The working environment of the rock breaking equipment is very bad, the working place is remote, and the equipment is damaged and lacks maintenance conditions.

The utility model patent CN217896606U discloses a hook arm for tunnel construction, comprising: big arm, small arm, loosener, bucket rod oil cylinder and bucket oil cylinder; the rear end of the big arm is hinged on the excavator frame, the rear end of the small arm 4 is hinged on the front end of the big arm, and the rear end of the scarifier is hinged on the front end of the small arm; an oil cylinder is connected between the frame and the big arm 1, the small arm and the big arm are connected with a bucket rod oil cylinder, and the scarifier and the small arm are connected with a bucket oil cylinder; the loosener is provided with upper teeth and lower teeth which are distributed in an eight shape. The device of the utility model has the working range of the upper part and the right front part of the excavator, is suitable for the construction of the front face, the side wall and the top of a tunnel, and is not suitable for common open-air operation.

The utility model patent CN206591553U discloses an integrated rock breaking small arm, adopts the combination mode of the small arm and a scarifier, omits a bucket rod oil cylinder, has simple structure and convenient operation, enables the small arm to be an integral excavating main body, and well solves the problem of insufficient excavating depth. However, the front end knife board is worn seriously because of the direct participation of the operation, and meanwhile, the front end knife board is also subjected to extremely large impact force, after the front end knife board is damaged, the whole arm or the knife board is required to be replaced, the maintenance time of the excavator is long, and the cost is high.

Disclosure of utility model

The utility model aims to solve the technical problems of the existing rock breaking equipment and provides the small arm of the excavator, which is more convenient and simpler to maintain.

The technical scheme adopted by the utility model is as follows:

A double-cutter-head small arm of an excavator comprises a small arm and a cutter plate. The small arm is provided with a large arm connecting hole, an oil cylinder connecting hole and a cutter plate connecting hole, and the middle part of the cutter plate is provided with a hole connected with the small arm; the cutter plate is connected with the small arm through a detachable pin shaft; the cutter plate is divided into an upper part and a lower part, and the lower part is a working end; the upper part and the lower part of the cutter plate are respectively provided with a tooth seat for installing cutter teeth; the lower part of the knife board and the upper part of the knife board can be used interchangeably.

The small arm is provided with at least two groups of knife board connecting holes which are connected with the knife boards.

The upper and lower blade portions are approximately symmetrical about a central plane.

The knife plate is approximately centrosymmetric.

The forearm is provided with a cavity for receiving a portion of the blade.

And the cutter plate is provided with a force unloading hole, and the cross section of the force unloading hole is in a smooth transition arc shape.

Reinforcing blocks are attached to the outer sides of the cutter plate connecting holes.

The side wings of the knife board are provided with wear-resisting blocks.

The toothholder at the end part of the cutter plate is used for installing cutter teeth.

The utility model has the beneficial effects that:

the cutting board has two working ends, and one end works, and one end is reserve, and when one of them working end damages the back can change the other end and continue work. When maintenance conditions exist, the damaged end can be maintained on the excavator equipment without disassembling the cutter unloading plate. The downtime is shortened, and the maintenance is more flexible.

The small arm and the knife board are arranged to be detachable, and after the knife board is damaged, a new knife board can be quickly replaced or the working end of the knife board can be turned to work continuously, so that the maintenance cost is reduced, the maintenance time is saved, and the maintenance is simpler.

Drawings

Fig. 1 is a schematic diagram of the large and small arm connection of the present utility model.

Fig. 2 is a schematic view of the entire forearm of the utility model.

Fig. 3 is a schematic view of a knife plate of the present utility model.

Fig. 4 is a schematic view of a second form of the blade of the present utility model.

Fig. 5 is a schematic view of the forearm of the utility model.

In the figure, a small arm 100, a fork plate 101, a cover plate 102, a large arm connecting hole 105, an oil cylinder connecting hole 106 and knife plate connecting holes 103 and 104; blade 200, tooth holder 201, wear-resisting block 202, holes 203, 204, blade teeth 205, reinforcing block 206 and unloading hole 207; large arm 300, small arm cylinder 301.

Detailed Description

Example 1

Referring to fig. 1 to 5, the small arm of the double-cutter-head excavator comprises a small arm 100 and a cutter plate 200, wherein the small arm 100 is provided with a large arm connecting hole 105 and an oil cylinder connecting hole 106, cutter plate connecting holes 103 and 104 connected with the cutter plate 200 are formed in the lower part of the small arm 100, and corresponding holes 203 and 204 are formed in the cutter plate 200; the knife board 200 is arranged between the two parallel fork opening boards 101, the small arm 100 and the knife board 200 are connected with each other through a detachable pin shaft, the knife board 200 is divided into an upper part and a lower part, and the lower part is a working end; the upper part and the lower part of the cutter plate are respectively provided with a tooth seat 201 for installing cutter teeth; the lower part of the knife board and the upper part of the knife board can be used in a position-changeable way. The upper part of the knife board 200 is exposed out of the forearm 100, so that the knife board 200 is convenient to maintain, and the position of the knife board 200 can be exchanged or replaced only by pulling out the connecting pin shaft during disassembly.

Example 2

In this embodiment, the structure of the forearm is further described on the basis of embodiment 1, the knife board connecting holes 103 and 104 of the forearm are arranged on two fork boards 101, two groups of holes are symmetrically arranged in parallel and have a certain distance in the middle, each group of holes are coaxial, the cover board 102 covers the side face of the fork board 101 to form a box-type structure, and the inside of the box body is provided with reinforcing ribs to ensure the structural strength of the box body. The connection part of the front section of the forearm 100 and the knife board 200 is in a fork structure, and the knife board 200 is inserted between the two fork opening boards 101 for alignment installation. The cover plate 102 is provided with a avoiding groove, which is convenient for the installation, replacement and maintenance of the knife board 200. The upper part of the forearm 100 is provided with a hole 105 hinged to the forearm, the hole 105 being located at the upper left of the line connecting the centers of the holes 103 and 104, as shown in fig. 5. An oil cylinder connecting hole 106 hinged with the small arm oil cylinder 301 is arranged above the large arm connecting hole 105, and the small arm oil cylinder 301 pushes the small arm to work through telescopic action.

Example 3

In this embodiment, the cutting board is further described on the basis of embodiment 1, and the cutting board 200 is provided with a force unloading hole 207 for dispersing stress, reducing stress concentration, reducing rigidity and improving stability. As shown in fig. 3 and 4, the force relief hole 207 is a curved kidney-shaped hole. The relief holes 207 may also be provided in other forms, as long as they have a smooth transition curve in cross-sectional profile along the length of the blade.

The cutter plate is provided with at least two tooth holders 201 which are respectively arranged at two ends of the cutter plate, the two side edges of the tooth holders are provided with wear-resisting blocks 202, and cutter teeth 205 for breaking rocks can be arranged on the tooth holders.

The tooth holder 201 positions at two ends of the cutter plate can be designed into different installation distances, and the cutter plate can be quickly replaced and installed under different working conditions to meet the use requirements. During replacement, the pin shafts at the holes 103 and 104 are detached, two ends of the cutter plate 200 are replaced and turned 180 degrees, the holes 203 and 204 are aligned with the cutter plate connecting holes 103 and 104, and then the pin shafts are reloaded and fixed.

Example 4

In this embodiment, the upper and lower parts of the cutting board are approximately symmetrical with respect to the center plane, and as shown in fig. 3, the cutting board is moved up and down along the center plane, and the upper part of the cutting board is moved to the working position.

As shown in fig. 4, the upper and lower blade portions of the present utility model may also be arranged to be center-symmetrical, i.e., the upper blade portion is exchanged to the working position by rotating the blade 180 ° along its center.

In order to adapt to different working conditions, the upper part of the cutter plate and the lower part of the cutter plate can be set to be different in length and different in appearance, and cutter teeth 205 with different specifications can be installed. The short knife board is used for hard rocks, the digging force is larger, and the long knife board is used for softer rocks, so that the digging depth is deeper.

Example 5

In this embodiment, the present utility model is further described with respect to the arm of embodiment 1, in which the cavity is provided and the blade 200 is partially accommodated; in particular for receiving the upper part of the blade.

Claims (9)

1. An excavator forearm of two tool bits, its characterized in that: comprises a small arm and a knife board; the small arm is provided with a large arm connecting hole, an oil cylinder connecting hole and a cutter plate connecting hole, and the middle part of the cutter plate is provided with a hole connected with the small arm; the cutter plate is connected with the small arm through a detachable pin shaft; the cutter plate is divided into an upper part and a lower part, and the lower part is a working end; the upper part and the lower part of the cutter plate are respectively provided with a tooth seat for installing cutter teeth; the lower part of the knife board and the upper part of the knife board can be used in a position-changeable way.

2. The dual bit excavator forearm of claim 1 wherein: the small arm is provided with at least two groups of knife board connecting holes which are connected with the knife boards.

3. The dual bit excavator forearm of claim 1 wherein: the upper and lower blade portions are approximately symmetrical about a central plane.

4. The dual bit excavator forearm of claim 1 wherein: the knife plate is approximately centrosymmetric.

5. The dual bit excavator forearm of claim 1 wherein: the forearm is provided with a cavity for receiving a portion of the blade.

6. The dual bit excavator forearm of claim 1 wherein: and the cutter plate is provided with a force unloading hole, and the cross section of the force unloading hole is in a smooth transition arc shape.

7. The dual bit excavator forearm of claim 1 wherein: reinforcing blocks are attached to the outer sides of the cutter plate connecting holes.

8. The dual bit excavator forearm of claim 1 wherein: the side wings of the knife board are provided with wear-resisting blocks.

9. The dual bit excavator forearm of claim 1 wherein: the toothholder at the end part of the cutter plate is used for installing cutter teeth.