Protective device for air cylinder of electric hammer

Abstract

The utility model relates to the technical field of electric tools, and discloses an electric hammer air cylinder protection device which comprises a shell, a transmission mechanism is arranged in the shell and comprises a swing rod bearing and an air cylinder, the closed end of the air cylinder extends outwards to form a pair of lug plates, a swing rod of the swing rod bearing is located in the middle of the pair of lug plates, and the swing rod of the swing rod bearing is connected with the air cylinder. U-shaped gaskets are arranged between the swing rod and the lug plates on the two sides, and the closed ends of the U-shaped gaskets abut against the closed ends of the air cylinders. According to the electric hammer, the U-shaped gasket is arranged, the closed end of the air cylinder blocks the closed end of the U-shaped gasket, and the U-shaped gasket cannot move relatively, so that abrasion caused by friction between the gasket and the connecting part of the air cylinder in the working process of the electric hammer is eliminated, and tight matching and reasonable clearance between the bearing and the air cylinder are ensured; and the working efficiency and performance of the electric hammer are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a protective device for an electric hammer cylinder. Background Art

[0002] An electric hammer is a power tool that combines rotation and hammering functions, primarily used for quickly drilling holes in hard materials such as concrete and stone. Its operating principle is that an electric motor drives the drill bit to rotate, while simultaneously utilizing the impact force generated by compressed air to simultaneously hammer the drill bit with high frequency, effectively breaking up the material and quickly forming a hole. During operation, the electric hammer uses an intermediate shaft to drive the rocker bearing back and forth, which in turn drives the cylinder back and forth. This causes a piston to reciprocate within a cylinder, compressing the air. The cyclical fluctuations in air pressure within the cylinder drive the hammer in the cylinder to reciprocate and strike the top of the drill bit.

[0003] Existing technology, such as the utility model patent with announcement number CN 211729048U announced by the State Intellectual Property Office on October 23, 2020, discloses an electric hammer. Its content states: "The transmission mechanism includes an intermediate shaft, a rocker bearing, and a cylinder assembly. The motor and the intermediate shaft are connected by gear transmission. The rocker bearing is installed on the intermediate shaft and can rotate with the intermediate shaft. The rotating sleeve is connected to the intermediate shaft by gear transmission." Figure 1 It can be seen that a circular gasket is set between the swing rod and the cylinder ear plate. The purpose is to avoid direct contact between the swing rod and the cylinder ear plate, thereby dispersing stress and reducing wear.

[0004] However, since the swing rod swings at a high frequency while driving the cylinder to reciprocate, and at the same time drives the pin to rotate back and forth at a high frequency, the circular gasket will inevitably vibrate and rotate under the dual drive of the swing rod and the pin, making a loud noise, and causing wear on the ear plate, continuously thinning the ear plate, and aggravating the wear of the ear plate through hole, thereby seriously affecting the service life of the cylinder. Summary of the Invention

[0005] In order to overcome the above defects, the technical problem to be solved by the present invention is: to provide an electric hammer cylinder protection device for reducing the wear on the cylinder connection caused by the relative movement of the gasket in the process of the rocker bearing driving the cylinder to move.

[0006] In order to solve the technical problem, the technical solution of the utility model is: a protective device for an electric hammer cylinder, comprising a shell, a transmission mechanism provided in the shell, the transmission mechanism comprising a rocker bearing and a cylinder, a pair of ear plates extending outward from the closed end of the cylinder, the rocker rod of the rocker bearing being located in the middle of the pair of ear plates and being hingedly connected to the pair of ear plates through a pin shaft, a U-shaped gasket being provided between the rocker rod and the ear plates on both sides, the closed end of the U-shaped gasket abutting against the closed end of the cylinder. We know that when the swing arm of the rocker bearing pushes the ear plate toward the cylinder, it is a heavy-load stroke, and when the swing arm of the rocker bearing pushes the ear plate against the cylinder, it is a light-load stroke. Because the closed end of the U-shaped gasket abuts the closed end of the cylinder, and the hardness of the U-shaped gasket is greater than that of the ear plate, the U-shaped gasket can bear most of the impact load for the ear plate during the heavy-load stroke, which can greatly extend the service life of the ear plate. Because the closed end of the U-shaped gasket abuts the closed end of the cylinder, when the swing arm and the pin rotate, the closed end of the cylinder abuts the closed end of the U-shaped gasket, preventing the U-shaped gasket from rotating relative to the ear plate. In this way, relative wear between the U-shaped gasket and the ear plate will not occur, thereby extending the service life of the ear plate. The failure of the ear plate is the main cause of cylinder failure. Therefore, a significant extension of the service life of the ear plate is also a significant extension of the service life of the cylinder. In addition, since the closed end of the U-shaped gasket abuts against the closed end of the cylinder, the U-shaped gasket will not vibrate when the swing rod and pin shaft rotate like a circular gasket, thereby greatly reducing the working noise of the electric hammer.

[0007] As a further technical solution, the two ends of the pin shaft (6) of the swing rod (5) are respectively passed through the side plates and ear plates (9) of the U-shaped gasket (7). The ear plates of the cylinder are usually made of aluminum, while the U-shaped gasket is made of hard metal. During the rotation process, the pin shaft is fixed to the center hole of the U-shaped gasket side plate, ensuring that the wear between the ear plates and the pin shaft can be reduced during the long-term rotation process.

[0008] As a further technical solution, the side of the swing arm contacts the inner side of the side plate of the U-shaped gasket, and the outer side of the side plate of the U-shaped gasket contacts the inner side of the ear plate. The U-shaped gasket is used to fill the gap between the swing arm and the ear plate, ensuring a tight kinematic fit between the swing bearing and the cylinder.

[0009] As a further technical solution: the outer periphery of the cylinder is arranged inside the shell.

[0010] As a further technical solution, a motor is disposed within the housing, the output end of the motor being connected to an intermediate shaft via a gear transmission, and the inner ring of the rocker bearing is disposed on the outer periphery of the intermediate shaft. The motor can provide the power required for rotation, and the intermediate shaft can drive the rocker bearing to move.

[0011] As a further technical solution: the intermediate shaft outer periphery is rotatably connected to the inside of the electric hammer shell through a bearing.

[0012] The utility model has the advantages of:

[0013] 1. In the utility model, by setting U type gasket, make the closed end of cylinder block U type gasket's closed end, make U type gasket unable to rotate relatively, thereby eliminate the abrasion that produces between gasket and cylinder connecting portion in the working process of electric hammer because of friction, ensure that the cooperation of bearing and cylinder is close and clearance is reasonable, improve the working efficiency and performance of electric hammer.

[0014] 2. In the utility model, by setting U type gasket made of hard metal, the abrasion of U type gasket is smaller when pin shaft rotates, thereby reduce the damage to cylinder, and after the abrasion of U type gasket, only need to replace U type gasket, not only improve the durability of equipment, but also reduce the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A kind of electric hammer cylinder protection device's shell front view cross section schematic view is proposed for the utility model;

[0016] Figure 2 A kind of electric hammer cylinder protection device's Figure 1 The enlarged schematic view of place A of;

[0017] Figure 3 A kind of electric hammer cylinder protection device's cylinder top surface cross section schematic view is proposed for the utility model;

[0018] Figure 4 A kind of electric hammer cylinder protection device's U type gasket three-dimensional schematic view is proposed for the utility model.

[0019] LEGEND:

[0020] 1, shell;2, motor;3, intermediate shaft;4, swing lever bearing;5, swing lever;6, pin shaft;7, U type gasket;8, cylinder;9, ear plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0022] Refer to Figures 1-3The utility model provides an embodiment: a hammer cylinder protection device, including casing 1, the inside of casing 1 is provided with the motor 2 of providing equipment power, the rear end of the inside of casing 1 is arranged to the motor 2, the motor 2 output shaft is connected with intermediate shaft 3 through gear drive, open motor 2, and the motor 2 will drive intermediate shaft 3 rotation, and intermediate shaft 3 is rotatably connected in the inside of casing 1, and intermediate shaft 3 periphery is provided with swing lever bearing 4, and swing lever bearing 4 is inclined to the axial direction of intermediate shaft 3, so that intermediate shaft 3 rotation can drive the swing of swing lever bearing 4 outer ring, and swing lever bearing 4 top end extends upwards and forms swing bar 5, and swing bar 5 top end is hinged with cylinder 8 through pin shaft 6, and swing bar 5 can rotate with pin shaft 6 as the shaft, at this time, swing bar 5 can transmit the swing of swing lever bearing 4 to cylinder 8, and cylinder 8 reciprocates along the axial direction, and cylinder 8 is arranged in the inside of casing 1;

[0023] Referring to Figures 2-4 The inside of the closed end of cylinder 8 is fixedly connected with lug plate 9, lug plate 9 is provided with two, and is symmetrically arranged on the front and back sides of the inside end face of cylinder 8, and pin shaft 6 is rotatably connected in the inside of lug plate 9;U-shaped gasket 7 is arranged between the inside of lug plate 9 and the top end of swing bar 5, and the outside of the base end of U-shaped gasket 7 abuts against the inside end face of cylinder 8, and the side plate of U-shaped gasket 7 abuts against the inside of lug plate 9, at this time, when pin shaft 6 rotates, friction drives U-shaped gasket 7 to rotate, at this time, the inside end face of cylinder 8 will stop U-shaped gasket 7, so that U-shaped gasket 7 cannot rotate, reducing the friction between U-shaped gasket 7 and lug plate 9, a circular through hole is formed in the center of the side plate of U-shaped gasket 7, pin shaft 6 penetrates and is rotatably connected in the center through hole of the side plate of U-shaped gasket 7, when the swing angle of swing bar 5 is too large, the inside of the base end of U-shaped gasket 7 can be contacted with the top end of swing bar 5, at this time, the inside of the base end of U-shaped gasket 7 can absorb part of impact energy, reducing the damage to swing lever bearing 4 and cylinder 8.

[0024] Working principle: when the electric hammer is opened, the output shaft of the motor 2 drives the intermediate shaft 3 to rotate through gear transmission, the intermediate shaft 3 drives the inner ring of the swing lever bearing 4 to rotate, the inner ring of the swing lever bearing 4 drives the outer ring of the swing lever bearing 4 to swing, the outer ring of the swing lever bearing 4 drives the top end of the swing lever 5 to swing, the swing lever 5 drives the cylinder 8 to reciprocate along the axis direction through the pin shaft 6, at this time the swing lever 5 will rotate along the shaft of the pin shaft 6, drive the pin shaft 6 to rotate, at this time the inner side end face of the cylinder 8 will block the base of the U-shaped gasket 7, so that the U-shaped gasket 7 cannot rotate relative to the lug plate 9, thereby eliminating the wear between the U-shaped gasket 7 and the lug plate 9, improving the durability of the equipment. At the same time, the pin shaft 6 will produce friction on the connecting hole of the lug plate 9 and the circular through hole of the U-shaped gasket 7 when rotating, and wear them. The lug plate 9 of the cylinder 8 is made of aluminum, and the U-shaped gasket 7 is made of relatively hard metal, so the wear of the U-shaped gasket 7 caused by the rotation of the pin shaft 6 is relatively small, thereby reducing the damage to the cylinder 8. At the same time, after the U-shaped gasket 7 is worn, only the U-shaped gasket 7 needs to be replaced, which not only improves the durability of the equipment, but also reduces the maintenance cost.

[0025] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A protection device for an electric hammer cylinder, comprising a housing (1), a transmission mechanism provided in the housing (1), the transmission mechanism comprising a rocker bearing (4), a cylinder (8), a pair of lugs (9) extending outward from a closed end of the cylinder (8), a rocker rod (5) of the rocker bearing (4) being located in the middle of the pair of lugs (9) and being hingedly connected to the pair of lugs (9) via a pin (6), characterized in that: A U-shaped gasket (7) is provided between the swing rod (5) and the ear plates (9) on both sides, and the closed end of the U-shaped gasket (7) abuts against the closed end of the cylinder (8).

2. The electric hammer cylinder protection device according to claim 1, characterized in that: The two ends of the pin shaft (6) of the swing lever (5) are passed through the gap, and the side plates and ear plates (9) of the U-shaped gasket (7) are passed through the gap in turn.

3. The electric hammer cylinder protection device according to claim 1, characterized in that: The side surface of the swing rod (5) contacts the inner side of the side plate of the U-shaped gasket (7), and the outer side of the side plate of the U-shaped gasket (7) contacts the inner side of the ear plate (9).

4. The electric hammer cylinder protection device according to claim 1, characterized in that: The outer periphery of the cylinder (8) is arranged inside the housing (1).

5. The electric hammer cylinder protection device according to claim 1, characterized in that: A motor (2) is arranged inside the housing (1); an output end of the motor (2) is connected to an intermediate shaft (3) via a gear transmission; and an inner ring of the rocker bearing (4) is arranged on the outer periphery of the intermediate shaft (3).

6. The electric hammer cylinder protection device according to claim 5, characterized in that: The outer periphery of the intermediate shaft (3) is rotatably connected to the interior of the electric hammer housing via a bearing.

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