Pneumatic hammer

Abstract

The utility model relates to a pneumatic hammer which comprises a body comprising an air inlet channel; the cylinder is connected with the body and comprises a first chamber, a second chamber and a spacing part which is radially spaced between the first chamber and the second chamber, the spacing part comprises a through hole, and the through hole is communicated with the first chamber and the second chamber; the working piece is arranged at one end of the cylinder; the valve group is accommodated in the second cavity and comprises a seat part and a valve piece movably arranged on the seat part, the seat part comprises a communicating pipeline communicated with gas in the gas inlet channel, and gas from the gas inlet channel flows through the communicating pipeline and actuates the valve piece to close or not close the through hole; and the piston is movably accommodated in the first cavity, one tail end surface of the piston is provided with a convex part, and the convex part can abut against the valve piece to move towards the direction far away from the spacing part. Therefore, impact can be buffered and reduced, and damage to components is greatly reduced.

Description

Technical Field

[0001] This utility model relates to a pneumatic tool, and more particularly to a pneumatic hammer. Background Technology

[0002] A pneumatic hammer is a tool that uses compressed gas as a power source. It drives a hammer (piston) to strike a shaft back and forth rapidly, and the shaft then transmits the impact force to the target object, allowing for various operations such as pulling, hammering, digging, or cutting. For example, in the automotive repair industry, pneumatic hammers are often used to disassemble car components that are difficult to remove manually, such as fuel injectors. In the construction industry, pneumatic hammers can be used for impacting or chiseling objects.

[0003] In conventional pneumatic hammers, the impact surfaces of the hammer and valve that open and close the high-pressure gas flow channel are flat. After the hammer moves back after impacting forward, it will directly hit the valve and the seat where the valve is located. Since the valve is usually made of a material with relatively high flexibility, it is easily damaged.

[0004] Therefore, it is necessary to provide a novel and progressive pneumatic hammer to solve the above problems. Utility Model Content

[0005] The main purpose of this invention is to provide a pneumatic hammer that can buffer and reduce impact, thereby significantly reducing damage to components.

[0006] To achieve the above objectives, this utility model provides a pneumatic hammer, comprising: a body including an air inlet; a cylinder connected to the body, including a first chamber, a second chamber, and a spacer radially spaced between the first chamber and the second chamber, the spacer including a through hole communicating between the first chamber and the second chamber; a working member disposed at one end of the cylinder; a valve assembly housed in the second chamber, including a seat and a valve movably disposed in the seat, the seat including a connecting pipe communicating with the gas inlet, the gas from the air inlet flowing through the connecting pipe and actuating the valve to close or not close the through hole; and a piston movably housed in the first chamber, one end face of which is provided with a protrusion, the protrusion being able to push against the valve and move away from the spacer.

[0007] Preferably, the cylinder further includes a first cylinder body and a second cylinder body that are screwed together, the first chamber being located in the first cylinder body, the seat being accommodated in the second cylinder body, and the spacer being clamped between the first cylinder body and the seat.

[0008] Preferably, the cylinder further includes a second exhaust pipe communicating with the first chamber, and the spacer further includes a through channel communicating between the communicating pipe and the second exhaust pipe.

[0009] Preferably, the valve includes a base and a side protrusion laterally connected to the base, the side protrusion extending into the through hole and axially opposite to the protrusion of the piston, the protrusion impacting the side protrusion when the gas actuates the piston to move back toward the spacer.

[0010] Preferably, the lateral protrusion is radially spaced from the wall of the through hole.

[0011] Preferably, the lateral protrusion is movable through the through hole and partially extends into the first chamber.

[0012] Preferably, the cylinder further includes a first pipe and a first exhaust pipe communicating with the first chamber. The first pipe is in gas communication with the communicating pipeline. One end of the first pipe is further away from the partition than one end of the first exhaust pipe. The first exhaust pipe communicates with the outside of the cylinder.

[0013] Preferably, the valve includes a base and a side protrusion laterally connected to the base. The side protrusion extends into the through hole and is axially opposite to the protrusion of the piston. When the gas actuates the piston to move back towards the spacer, the protrusion impacts the side protrusion. The side protrusion is plate-shaped and includes two opposing arc surfaces that match the shape of the inner surface of the through hole. The protrusion includes an end face, and the side protrusion includes an end face. When the protrusion impacts the side protrusion, the end face of the protrusion is flush with the end face of the side protrusion. The side protrusion is radially spaced from the wall of the through hole. The side protrusion is movable through the through hole. The cylinder further includes a first pipe and a first exhaust pipe that connect to the first chamber. The first pipe is in gas communication with the connecting pipe. One end of the first pipe is further away from the spacer than one end of the first exhaust pipe. The first exhaust pipe connects to the outside of the cylinder. The pneumatic hammer further includes a first elastic member and a second elastic member. The first elastic member and the second elastic member axially abut against the cylinder and the body, respectively. The axial forces exerted by the first elastic member and the second elastic member on the cylinder are in opposite directions.

[0014] Preferably, the piston includes an annular recess that communicates with the gas in the connecting pipe when the piston contacts the working element.

[0015] Preferably, the annular recess deepens towards the spacer portion.

[0016] The advantages of this utility model are:

[0017] This utility model provides a pneumatic hammer that can buffer and reduce impact, significantly reducing damage to components. Attached Figure Description

[0018] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0019] Figure 2 This is an exploded view of an embodiment of the present invention.

[0020] Figure 3 This is another exploded view of an embodiment of the present invention.

[0021] Figure 4 This is a perspective view of a piston according to an embodiment of the present invention.

[0022] Figure 5 This is a side view of a piston according to an embodiment of the present invention.

[0023] Figure 6 This is a perspective view of a valve component according to an embodiment of the present invention.

[0024] Figure 7 and Figure 8 This is a cross-sectional view of the piston in an initial position according to an embodiment of the present invention.

[0025] Figure 9 and Figure 10 This is a cross-sectional view of the piston in an impact position according to an embodiment of the present invention. Detailed Implementation

[0026] The following examples illustrate possible implementations of this utility model, but are not intended to limit the scope of protection of this utility model. The prefixes "a" or "at least one" before the terms mentioned herein are not intended to limit the quantity. Depending on the requirements, there may also be "multiple" items. This variation in quantity is also within the scope of protection, as will be stated in advance.

[0027] Please refer to Figures 1 to 10 The illustration shows an embodiment of the present invention. The pneumatic hammer 1 of the present invention includes a body 10, a cylinder 20, a working part 30, a valve group 40 and a piston 50.

[0028] The main body 10 includes an air intake 11. A cylinder 20 is connected to the main body 10. The cylinder 20 includes a first chamber 21, a second chamber 22, and a spacer 23 radially spaced between the first chamber 21 and the second chamber 22. The spacer 23 includes a through hole 231 communicating between the first chamber 21 and the second chamber 22. A working member 30 is disposed at one end of the cylinder 20. A valve assembly 40 is housed in the second chamber 22. The valve assembly 40 includes a seat 41 and a valve member 42 movably disposed on the seat 41. The seat 41 includes a connecting pipe 411 communicating with the gas in the air intake 11. Gas from the air intake 11 flows through the connecting pipe 411 and actuates the valve member 42 to close or not close the through hole 231. The piston 50 is movably housed in the first chamber 21. A protrusion 51 is provided on one end face of the piston 50, which can impact the valve member 42 and move away from the spacer 23. Furthermore, when the through hole 231 is not closed by the valve member 42, the gas actuates the piston 50 to impact the working piece 30. When the gas actuates the piston 50 to move back towards the spacer 23, the protrusion 51 impacts the valve member 42 and moves away from the spacer 23. Thus, before the piston 50 returns and contacts the spacer 23, the impact on the piston 50, the spacer 23, and the valve member 42 is buffered by the compressed gas between them, significantly reducing damage to these components. When the protrusion 51 impacts the valve member 42, the compressed gas can open the valve member 42 through the through hole 231 and gradually release the compressed gas, placing the piston 50 in the initial position of the next impact, thereby enabling reciprocating impact actions.

[0029] The cylinder 20 further includes a first cylinder body 24 and a second cylinder body 25 that are screwed together, facilitating assembly, disassembly, replacement and maintenance. The first chamber 21 is located in the first cylinder body 24, the seat portion 41 is accommodated in the second cylinder body 25, and the spacer portion 23 abuts against the first cylinder body 24 and the seat portion 41.

[0030] The cylinder 20 further includes a first conduit 26 and a first exhaust conduit 27 connecting the first chamber 21. The first conduit 26 is in gas communication with the connecting pipe 411. One end of the first conduit 26 is further away from the spacer 23 than one end of the first exhaust conduit 27. The first exhaust conduit 27 connects to the outside of the cylinder 20. In this embodiment, the piston 50 includes an annular recess 52. When the piston 50 contacts the working piece 30, the annular recess 52 is in gas communication with the connecting pipe 411 via the first conduit 26. As the piston 50 moves from the spacer 23 toward the working piece 30, it compresses gas and discharges it from the first exhaust conduit 27 to the outside of the cylinder 20. After the piston 50 impacts the working piece 30, the gas from the intake passage 11 flows through the connecting pipe 411 and the first conduit 26 into the annular recess 52, pushing the piston 50 back toward the spacer 23. Preferably, the annular recess 52 gradually deepens towards the spacer 23, which can provide a larger force-bearing area and increase the force that pushes the piston 50 back.

[0031] The cylinder 20 further includes a second exhaust pipe 28 connecting the first chamber 21, and the partition 23 further includes a through channel 232 connecting the connecting pipe 411 and the second exhaust pipe 28. When the piston 50 returns and moves through the first exhaust pipe 27, the compressed air in the first chamber 21 can be conducted to the connecting pipe 411 through the second exhaust pipe 28 and the channel 232, thereby adjusting and changing the air pressure on the valve 42 on both sides, so that the valve 42 is subjected to appropriate pressure during opening and closing to obtain a stable and reliable opening and closing effect.

[0032] In detail, the valve 42 includes a base 421 and a side protrusion 422 laterally connected to the base 421. The side protrusion 422 extends into the through hole 231 and is axially opposite to the protrusion 51 of the piston 50. Preferably, the side protrusion 422 is radially spaced from the wall of the through hole 231 to provide a larger gas flow. The side protrusion 422 can move through the through hole 231 and partially extends into the first chamber 21. When the gas actuates the piston 50 to move back towards the spacer 23, the protrusion 51 impacts the side protrusion 422, which can prevent the valve 42 from being directly impacted and reduce damage. In detail, the side protrusion 422 is plate-shaped and includes two opposing arc surfaces 423. The two arc surfaces 423 are matched with the shape of the inner surface of the through hole 231. The side protrusion 422 can move stably along the inner surface of the through hole 231, guiding and maintaining the linear movement of the valve 42 without deflection. Thus, the operation and opening and closing of the valve 42 are more stable and precise and less prone to wear. In this embodiment, the protrusion 51 includes an end plane 511, and the side protrusion 422 includes an end plane 424. When the protrusion 51 impacts the side protrusion 422, the end plane 511 of the protrusion 51 and the end plane 424 of the side protrusion 422 are flat against each other, improving the stable contact between the protrusion 51 and the side protrusion 422 and the stable and precise operation of the valve 42.

[0033] Preferably, the pneumatic hammer 1 further includes a first elastic element 60 and a second elastic element 70, which axially abut against the cylinder 20 and the body 10, respectively. The axial forces exerted by the first elastic element 60 and the second elastic element 70 on the cylinder 20 are in opposite directions. In this embodiment, the first elastic element 60 is a coiled spring sleeved on the first cylinder 24 and abutting against the inner wall of a front shell 12 of the body 10. The second elastic element 70 is a wave-shaped spring sheet abutting against the inner walls of the second cylinder 25 and a rear shell 13 of the body 10. The first elastic element 60 and the second elastic element 70 can respectively buffer the impact forces generated by the piston 50's forward impact and backward return.

[0034] The above description is a preferred embodiment of the present utility model and the technical principles applied thereto. For those skilled in the art, any obvious changes such as equivalent transformations or simple substitutions based on the technical solution of the present utility model without departing from the spirit and scope of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A pneumatic hammer, characterized in that, include: One main body, including an air intake; A cylinder, connected to the body, includes a first chamber, a second chamber, and a spacer radially spaced between the first chamber and the second chamber. The spacer includes a through hole that connects the first chamber and the second chamber. A working part is located at one end of the cylinder; A valve assembly, housed in the second chamber, includes a seat and a valve movably disposed on the seat. The seat includes a connecting pipe communicating with the gas in the intake passage. Gas from the intake passage flows through the connecting pipe and actuates the valve to close or unclose the through-hole. A piston is movably housed in the first chamber, and a protrusion is provided on one end face of the piston, which can push against the valve and move away from the gap.

2. The pneumatic hammer as described in claim 1, characterized in that, The cylinder further includes a first cylinder body and a second cylinder body that are screwed together, the first chamber is located in the first cylinder body, the seat is accommodated in the second cylinder body, and the spacer is sandwiched between the first cylinder body and the seat.

3. The pneumatic hammer as described in claim 2, characterized in that, The cylinder further includes a second exhaust pipe communicating with the first chamber, and the spacer further includes a through channel communicating between the communicating pipe and the second exhaust pipe.

4. The pneumatic hammer as described in claim 1, characterized in that, The valve includes a base and a side protrusion laterally connected to the base. The side protrusion extends into the through hole and is axially opposite to the protrusion of the piston. When the gas actuates the piston to move back toward the gap, the protrusion impacts the side protrusion.

5. The pneumatic hammer as described in claim 4, characterized in that, The lateral protrusion is radially spaced from the wall of the through hole.

6. The pneumatic hammer as described in claim 4, characterized in that, The lateral protrusion is movable through the through hole and partially extends into the first chamber.

7. The pneumatic hammer as described in claim 1, characterized in that, The cylinder further includes a first pipe and a first exhaust pipe that connect to the first chamber. The first pipe is in gas communication with the connecting pipe. One end of the first pipe is further away from the partition than one end of the first exhaust pipe. The first exhaust pipe connects to the outside of the cylinder.

8. The pneumatic hammer as described in claim 3, characterized in that, The valve includes a base and a side protrusion laterally connected to the base. The side protrusion extends into the through hole and is axially opposite to the protrusion of the piston. When the gas actuates the piston to move back towards the spacer, the protrusion impacts the side protrusion. The side protrusion is plate-shaped and includes two opposing arc surfaces that match the shape of the inner surface of the through hole. The protrusion includes an end face, and the side protrusion includes an end face. When the protrusion impacts the side protrusion, the end face of the protrusion and the end face of the side protrusion are flush. The side protrusion is radially spaced from the wall of the through hole. The side protrusion is movable through the through hole and Part of it extends into the first chamber; the cylinder further includes a first pipe and a first exhaust pipe communicating with the first chamber, the first pipe communicating with the gas in the communicating pipe, one end of the first pipe being further away from the spacer than one end of the first exhaust pipe, and the first exhaust pipe communicating with the outside of the cylinder; the pneumatic hammer further includes a first elastic member and a second elastic member, the first elastic member and the second elastic member respectively axially abutting between the cylinder and the body, and the axial forces exerted by the first elastic member and the second elastic member on the cylinder are in opposite directions.

9. The pneumatic hammer according to any one of claims 1 to 8, characterized in that, The piston includes an annular recess that communicates with the gas in the connecting pipe when the piston contacts the working part.

10. The pneumatic hammer as described in claim 9, characterized in that, The annular recess gradually deepens towards the spacer.

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