Damping electric hammer

Abstract

The utility model relates to the technical field of electric hammers, in particular to a damping electric hammer which comprises a shell and a tail handle, and a motor, a gearbox, an air cylinder piston system and a drill bit assembly are arranged in the shell; the gearbox and the shell are arranged in a clearance fit mode, and a flexible damping piece is arranged between a rear cover of the gearbox and the shell. One end of the tail handle is rotatably connected with the shell, and a sliding damping connecting piece used for mutual connection is arranged between the other end of the tail handle and the shell. The gear box has the effects of reducing vibration of the gear box and guaranteeing the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric hammers, in particular to a shock-absorbing electric hammer. BACKGROUND

[0002] An electric hammer is a high-efficiency impact type electric tool driven by electric energy, which is widely used in the fields of construction, decoration, mining, etc., and is mainly used for drilling holes or breaking hard materials such as concrete, stone and brick walls. The core structure of the electric hammer is composed of an electric motor, a transmission mechanism, a cylinder piston system and a drill bit, which converts electric energy into high-frequency impact force through mechanical transmission, and realizes efficient penetration by combining rotary motion.

[0003] Compared with the traditional electric drill, the electric hammer adopts the pneumatic impact principle, and the internal piston reciprocates in the cylinder to produce continuous impact force during work, so that the drill bit can produce thousands of impacts per minute (usually 4000-6000 times per minute), and the impact energy can reach 2-10 joules. This design greatly improves the efficiency of hard material processing, and the operation speed is 3-5 times faster than that of ordinary electric drills, and can effectively reduce the physical exertion of the operator.

[0004] For the above-mentioned related technology, the inventor found that the gear box is clamped and fixed on the shell, and then the reaction force during the work of the cylinder piston system will cause a rigid collision between the gear box and the shell, which will easily damage the transmission components in the gear box, thereby reducing the service life. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above technical problems, the present application provides a shock-absorbing electric hammer, which has the advantages of reducing the vibration of the gear box and ensuring the service life.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0007] A shock-absorbing electric hammer, comprising a shell and a tail handle, wherein the shell is provided with an electric motor, a gear box, a cylinder piston system and a drill bit assembly;

[0008] The gear box and the shell are gap-fitted, and a flexible damping member is arranged between the rear cover of the gear box and the shell;

[0009] One end of the tail handle is rotatably connected with the shell, and the other end is provided with a sliding damping connecting piece for mutual connection.

[0010] The technical scheme is realized, that is, the gear box is driven by the motor to drive the piston in the piston system of the cylinder to reciprocate, thereby driving the drill bit assembly to move, so that axial impact drilling is realized; the gap is arranged between the gear box and the shell, that is, the gear box is not directly fixed and contacted with the shell, so that the gear box can shake in the shell without colliding with the shell, the vibration of the gear box is transmitted to the flexible damping piece, and the vibration is absorbed through the flexible damping piece, so that the vibration frequency of the gear box is reduced, and the damage of the gear box is reduced.

[0011] As a preferred scheme of the present application, the flexible damping piece comprises a plurality of flexible damping pads, and a plurality of deformation holes are arranged in the flexible damping pads.

[0012] The technical scheme is realized, so that when the flexible damping pad is impacted, it can be bent and deformed into the deformation hole, thereby improving the deformation and shock absorption capacity.

[0013] As a preferred scheme of the present application, the flexible damping pad is provided with an arc-shaped concave side wall away from the gear box.

[0014] The technical scheme is realized, and the arc-shaped concave side wall can further improve the damping capacity of the flexible damping pad, because the arc-shaped arrangement ensures the resilience of the concave side wall.

[0015] As a preferred scheme of the present application, the sliding damping connecting piece comprises a positioning column arranged on the tail handle, a sliding groove for sliding the positioning column is arranged on the shell, and an elastic piece for moving the positioning column away from the shell is arranged between the shell and the positioning column.

[0016] The technical scheme is realized, and the tail rotating shaft is rotated, and the rotating range is limited by the positioning column and the arc-shaped groove, so as to prevent the drill bit assembly on the shell from deviating too much. When the positioning column moves back and forth in the sliding groove, the elastic piece is compressed or released, so that the elastic piece absorbs kinetic energy, thereby achieving the effect of further damping.

[0017] As a preferred scheme of the present application, the shell is provided with a sliding sleeve, the tail handle is provided with a avoiding groove for inserting the sliding sleeve, and the sliding groove is arranged on the sliding sleeve.

[0018] The technical scheme is realized, so that the whole sliding damping connecting piece is located in the avoiding groove in the tail handle, thereby ensuring the aesthetic appearance.

[0019] As a preferred scheme of the present application, the elastic member is a spring, and the sliding sleeve is provided with an abutting plate on the side away from the sliding groove, and the spring is arranged between the abutting plate and the positioning column.

[0020] The above technical solution can absorb the kinetic energy of the positioning column by the spring.

[0021] In summary, the present application has at least one of the following beneficial technical effects:

[0022] 1. The electric motor drives the gear box to rotate, and then drives the piston in the piston-cylinder system to reciprocate, thereby driving the drill bit assembly to move, so as to realize axial impact drilling; the gear box and the shell are arranged in clearance fit, that is, the gear box and the shell are not directly fixed and contacted, so that the gear box can shake in the shell without colliding with the shell when subjected to the reaction force, the vibration of the gear box is transmitted to the flexible damping member, and the vibration is absorbed by the flexible damping member, so as to reduce the vibration frequency of the gear box, and further reduce the damage of the gear box; the vibration of the shell can be further absorbed by the sliding damping connecting piece, so as to ensure the stability of the tail handle held by the personnel, and reduce the vibration of the shell as a whole, thereby reducing the vibration of the gear box in the inner wall. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the internal structure of the shell in the embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the structure of the flexible damping pad in the embodiment of the present application.

[0027] Figure 4 It is a schematic diagram of the structure of the sliding damping connecting piece in the embodiment of the present application.

[0028] The drawings show that: 1, electric motor; 2, gear box; 3, cylinder-piston system; 4, drill bit assembly; 5, flexible damping member; 51, flexible damping pad; 52, deformation hole; 53, arc-shaped concave side wall; 6, shell; 61, rotating shaft; 7, tail handle; 8, sliding damping connecting piece; 81, positioning column; 82, sliding groove; 83, sliding sleeve; 84, spring; 85, abutting plate. DETAILED DESCRIPTION

[0029] The accompanying drawings are incorporated in and constitute a part of this specification and will be understood by those skilled in the art to illustrate various embodiments of the application. Figures 1-4 The application is further described in detail.

[0030] The application discloses a shock-absorbing electric hammer. Referring to Figure 1 The shock-absorbing electric hammer comprises a shell 6 and a tail handle 7, and the shell 6 is provided with a motor 1, a gear box 2, a cylinder piston system 3 and a drill bit assembly 4, that is, the motor 1 drives the gear box 2 to rotate, drives the piston in the cylinder piston system 3 to reciprocate, and drives the drill bit assembly 4 to act, so as to realize axial impact drilling.

[0031] The gear box 2 is arranged in clearance fit with the shell 6, that is, the gear box 2 is not directly fixed and contacted with the shell 6, so that the gear box 2 can shake in the shell 6 without colliding with the shell 6 when the gear box 2 is subjected to a reaction force, and a flexible shock-absorbing piece 5 is arranged between the rear cover of the gear box 2 and the shell 6; further, the gear box 2 shakes and is transmitted to the flexible shock-absorbing piece 5, and the vibration is absorbed through the flexible shock-absorbing piece 5, so as to reduce the vibration frequency of the gear box 2 and further reduce the damage of the gear box 2. The flexible shock-absorbing piece 5 comprises a plurality of flexible shock-absorbing pads 51, which can be rubber pads or silica gel pads, and a plurality of deformation holes 52 are arranged in the flexible shock-absorbing pads 51, so that the flexible shock-absorbing pads 51 can be bent and deformed into the deformation holes 52 when subjected to impact, thereby improving the deformation shock-absorbing capacity. An arc-shaped concave side wall 53 is arranged on the side of the flexible shock-absorbing pad 51 away from the gear box 2, so that the flexible shock-absorbing pad 51 can further improve the shock-absorbing capacity of the flexible shock-absorbing pad 51, because the arc-shaped arrangement ensures the resilience of the concave side wall.

[0032] One end of the tail handle 7 is rotationally connected with the shell 6, and in the embodiment, a rotating shaft 61 is arranged at the bottom of the shell 6, the tail handle 7 is rotationally arranged on the rotating shaft 61 and is locked by bolts, so that the tail handle 7 can rotate around the rotating shaft 61, and a sliding shock-absorbing connecting piece 8 for mutual connection is arranged between the other end of the tail handle 7 and the shell 6, so that the vibration of the gear box 2 transmitted to the shell 6 through the flexible shock-absorbing piece 5 is transmitted to the tail handle 7, and the one end of the tail handle 7 is rotationally connected with the shell 6 and the other end is connected through the sliding shock-absorbing connecting piece 8, so that the vibration of the shell 6 is further absorbed by the sliding shock-absorbing connecting piece 8, thereby ensuring the stability of the personnel holding the tail handle 7 and reducing the overall vibration of the shell 6, so as to reduce the vibration of the gear box 2 in the inner wall.

[0033] The sliding damping connecting piece 8 comprises a positioning column 81 arranged on the tail handle 7, and the shell 6 is provided with a sliding groove 82 for sliding of the positioning column 81, the sliding groove 82 is an arc-shaped groove with the rotating shaft 61 as an axis, and an elastic piece is arranged between the shell 6 and the positioning column 81 and used for moving the positioning column 81 away from the shell 6, so that the tail rotating shaft 61 is rotated, and the rotating range is limited by the positioning column 81 and the arc-shaped groove, so as to prevent the drill bit assembly 4 on the shell 6 from being deviated too much, when the positioning column 81 moves back and forth in the sliding groove 82, the elastic piece is compressed or released, so that the elastic piece absorbs kinetic energy, thereby achieving the effect of further damping.

[0034] The shell 6 is provided with a sliding sleeve 83, the tail handle 7 is provided with a avoiding groove for insertion of the sliding sleeve 83, and the sliding groove 82 is arranged on the sliding sleeve 83, so that the entire sliding damping connecting piece 8 is located in the avoiding groove inside the tail handle 7, thereby ensuring the aesthetic property.

[0035] The elastic piece is a spring 84, the side, away from the sliding groove 82, of the sliding sleeve 83 is provided with an abutting plate 85, and the spring 84 is arranged between the abutting plate 85 and the positioning column 81, so that the kinetic energy of the positioning column 81 can be absorbed by the spring 84.

[0036] The implementation principle of the damping electric hammer in the embodiment of the application is as follows: the motor 1 drives the gear box 2 to rotate, and then drives the piston in the cylinder piston system 3 to reciprocate, so as to drive the drill bit assembly 4 to act, thereby realizing axial impact drilling; the gear box 2 and the shell 6 are arranged in clearance fit, that is, the gear box 2 and the shell 6 are not directly fixed and contacted, so that the gear box 2 can shake in the shell 6 without colliding with the shell 6 when the gear box 2 is subjected to a reaction force, the vibration of the gear box 2 is transmitted to the flexible damping piece 5, and the vibration is absorbed by the flexible damping piece 5, so as to reduce the vibration frequency of the gear box 2, thereby reducing the damage of the gear box 2; the vibration of the shell 6 is further absorbed by the sliding damping connecting piece 8, so as to ensure the stability of the tail handle 7 held by a person, and the vibration of the shell 6 as a whole is reduced, thereby reducing the vibration of the gear box 2 on the inner wall of the shell 6.

[0037] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A vibration-damping electric hammer, characterized in that: It includes a housing (6) and a tail shank (7), wherein the housing (6) is provided with an electric motor (1), a gearbox (2), a cylinder piston system (3) and a drill bit assembly (4); The gearbox (2) and the housing (6) are fitted with a clearance, and a flexible shock absorber (5) is provided between the rear cover of the gearbox (2) and the housing (6); One end of the tailstock (7) is rotatably connected to the housing (6), and the other end is provided with a sliding shock-absorbing connector (8) for mutual connection between the tailstock (7) and the housing (6).

2. The vibration-damping electric hammer according to claim 1, characterized in that: The flexible damping component (5) includes a plurality of flexible damping pads (51), and the flexible damping pads (51) are provided with a plurality of deformation holes (52).

3. The vibration-damping electric hammer according to claim 2, characterized in that: The flexible shock-absorbing pad (51) has an arc-shaped concave sidewall (53) on the side away from the gearbox (2).

4. The vibration-damping electric hammer according to claim 1, characterized in that: The sliding shock-absorbing connector (8) includes a positioning post (81) provided on the tailstock (7), a sliding groove (82) provided on the housing (6) for the positioning post (81) to slide, and an elastic element provided between the housing (6) and the positioning post (81) for moving the positioning post (81) away from the housing (6).

5. A vibration-damping electric hammer according to claim 4, characterized in that: The housing (6) is provided with a sliding sleeve (83), the tail shank (7) is provided with a clearance groove for the sliding sleeve (83) to be inserted, and the sliding groove (82) is provided on the sliding sleeve (83).

6. A vibration-damping electric hammer according to claim 5, characterized in that: The elastic element is configured as a spring (84), and the sliding sleeve (83) is provided with an abutment plate (85) on the side away from the sliding groove (82). The spring (84) is disposed between the abutment plate (85) and the positioning post (81).

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