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 cylinder further comprises a first cylinder body and a second cylinder body which are locked in a screwed mode, the first chamber is located in the first cylinder body, the spacing part comprises a through hole, and the second chamber is located in the second cylinder body. 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, and the valve piece can move to seal or not seal the through hole; the piston is movably accommodated in the first cavity; wherein the pneumatic hammer further comprises a first elastic piece and a second elastic piece, the first elastic piece and the second elastic piece are axially and elastically abutted between the cylinder and the body respectively, and the axial forces of the first elastic piece and the second elastic piece acting on the cylinder are opposite in direction.

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] It is known that the impact surfaces of the hammer and valve in a pneumatic hammer, which open and close the high-pressure gas flow channel, are flat. After the hammer impacts forward and moves back, it directly strikes the valve and the seat on which the valve is located. Since the valve is usually made of a relatively flexible material, it is easily damaged. In addition, it is known that other internal components of the pneumatic hammer are also easily damaged by the impact.

[0004] Therefore, it is necessary to provide a novel and progressive pneumatic hammer to solve the above-mentioned 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 cylinder further including a first cylinder body and a second cylinder body screwed together, the first chamber being located in the first cylinder body, 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 valve movably closing or not closing the through hole; and a piston movably housed in the first chamber;

[0007] The pneumatic hammer further includes a first elastic element and a second elastic element, which axially abut against the cylinder and the body, respectively. The axial forces exerted by the first elastic element and the second elastic element on the cylinder are in opposite directions.

[0008] The seat is housed in the second cylinder body. The seat includes a connecting pipe that communicates with the gas in the intake manifold. The spacer is sandwiched between the first cylinder body and the seat. When the through hole is not closed by the valve, the gas actuates the piston to impact the working part. When the gas actuates the piston to move back towards the spacer, the valve moves away from the spacer.

[0009] 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.

[0010] The piston has a protrusion on one end face. 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 from the intake passage actuates the piston to move back towards the interval, the protrusion hits the side protrusion, causing the valve to move away from the interval.

[0011] The lateral protrusion is radially spaced from the wall of the through hole.

[0012] The lateral protrusion is movable through the through hole and partially extends into the first chamber.

[0013] 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.

[0014] The piston has a protrusion at one end face. 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 gas from the intake passage actuates the piston to move back towards the spacer, the protrusion impacts the side protrusion, causing the valve to move away from the spacer. The side protrusion is plate-shaped and includes two opposing arc surfaces, which 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 hits the side protrusion, the end plane of the protrusion is flush with the end plane of the side protrusion; the side protrusion is radially spaced from the wall of the through hole; the side protrusion can move through the through hole and partially extend 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.

[0015] The piston includes an annular recess that communicates with the gas in the connecting pipe when the piston contacts the working part.

[0016] The annular recess gradually deepens towards the spacer.

[0017] The beneficial effects of this utility model are: the pneumatic hammer obtained by this utility model can buffer and reduce impact, and greatly reduce 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.

[0026] 1: Pneumatic hammer

[0027] 10:Ontology

[0028] 11: Air intake

[0029] 12: Front shell

[0030] 13: Back cover

[0031] 20: Cylinder

[0032] 21: First Chamber

[0033] 22: Second Chamber

[0034] 23: Spacing section

[0035] 231: Through-hole

[0036] 232: Channel

[0037] 24: First cylinder block

[0038] 25: Second cylinder block

[0039] 26: First Pipeline

[0040] 27: First exhaust pipe

[0041] 28: Second exhaust pipe

[0042] 30: Workpiece

[0043] 40: Valve assembly

[0044] 41: Seat

[0045] 411: Connecting pipes

[0046] 42: Valve

[0047] 421: Base

[0048] 422: Lateral convexity

[0049] 423: Curved surface

[0050] 424: End plane

[0051] 50: Piston

[0052] 51:convex part

[0053] 511: End plane

[0054] 52: Ring concave

[0055] 60: First elastic element

[0056] 70: Second elastic element Detailed Implementation

[0057] 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, and is therefore stated in advance.

[0058] 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.

[0059] 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 cylinder 20 also includes a first cylinder body 24 and a second cylinder body 25 screwed together for easy assembly, disassembly, replacement, and maintenance. The first chamber 21 is located within the first cylinder body 24, and a seat 41 is accommodated in the second cylinder body 25. Preferably, the spacer 23 abuts against the first cylinder body 24 and the seat 41. The spacer 23 includes a through hole 231 communicating between the first chamber 21 and the second chamber 22. A working member 30 is located at one end of the cylinder 20. The 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. When the through hole 231 is not closed by the valve member 42, the gas actuates the piston 50 to impact the working member 30. When the gas actuates the piston 50 to move back towards the spacer 23, the valve member 42 moves away from the spacer 23 (driven by compressed gas or pushed by the piston 50). The pneumatic hammer 1 further includes a first elastic element 60 and a second elastic element 70. The first elastic element 60 and the second elastic element 70 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.

[0060] In this way, before the piston 50 returns to contact the spacer 23, it can be buffered by the compressed gas between the two, reducing the impact on the piston 50, the spacer 23 and the valve 42, greatly reducing the damage to these components. When the valve 42 moves away from the spacer 23, the compressed gas can open the valve 42 through the through hole 231 and gradually release the compressed gas, so that the piston 50 is in the next impact initial position, thus enabling reciprocating impact action.

[0061] 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.

[0062] 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.

[0063] In detail, the valve 42 includes a base 421 and a side protrusion 422 laterally connected to the base 421. A protrusion 51 is provided on one end face of the piston 50. 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, providing a larger gas flow rate. 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, causing the valve 42 to move away from the spacer 23, thus preventing the valve 42 from being directly impacted and reducing 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 wobbling. 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 hits the side protrusion 422, the end plane 511 of the protrusion 51 and the end plane 424 of the side protrusion 422 are flat, improving the stable contact between the protrusion 51 and the side protrusion 422 and the stable and precise operation of the valve 42.

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 portion radially spaced between the first chamber and the second chamber. 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 spacer portion 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 member movably disposed on the seat, the valve member being movably capable of closing or unclosing the through hole; and A piston is movably housed in the first chamber; The pneumatic hammer further includes a first elastic element and a second elastic element, which axially abut against the cylinder and the body, respectively. The axial forces exerted by the first elastic element and the second elastic element on the cylinder are in opposite directions.

2. The pneumatic hammer as described in claim 1, characterized in that: The seat is housed in the second cylinder body. The seat includes a connecting pipe that communicates with the gas in the intake manifold. The spacer is sandwiched between the first cylinder body and the seat. When the through hole is not closed by the valve, the gas actuates the piston to impact the working part. When the gas actuates the piston to move back towards the spacer, the valve moves away from the spacer.

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 piston has a protrusion on one end face. 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 from the intake passage actuates the piston to move back towards the interval, the protrusion hits the side protrusion, causing the valve to move away from the interval.

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 2, 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 piston has a protrusion at one end face. 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 gas from the intake passage actuates the piston to move back towards the spacer, the protrusion impacts the side protrusion, causing the valve to move away from the spacer. The side protrusion is plate-shaped and includes two opposing arc surfaces, which 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 hits the side protrusion, the end plane of the protrusion is flush with the end plane of the side protrusion; the side protrusion is radially spaced from the wall of the through hole; the side protrusion can move through the through hole and partially extend 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.

9. The pneumatic hammer as described in any one of claims 2, 3, 7 and 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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