TWM670053U - Pneumatic Hammer - Google Patents

Abstract

The invention relates to a pneumatic hammer, comprising: a body, comprising an air inlet; a cylinder, connected to the body, comprising a first chamber, a second chamber and a partition radially spaced between the first chamber and the second chamber, the partition comprising a through hole, the through hole connecting the first chamber and the second chamber; a working piece, arranged at one end of the cylinder; a valve assembly, accommodated in the second chamber, comprising a seat and a valve member movably arranged on the seat, the valve member comprising a base and a side projection laterally connected to the base, the valve member can movably close or not close the through hole; and a piston, movably accommodated in the first chamber.

Description

Pneumatic Hammer

This invention relates to a pneumatic tool, in particular to a pneumatic hammer.

A pneumatic hammer is a tool that uses compressed gas as a power source. By driving the hammer (piston) to strike the shaft back and forth quickly, the shaft then transmits the impact force to the target object to perform various operations such as pulling, knocking, digging or cutting. For example, in the field of automobile maintenance, pneumatic hammers are often used to dismantle automobile components such as fuel injectors that are difficult to remove manually, or in the field of structural construction, pneumatic hammers can be used for operations such as impacting or drilling objects.

It is known that the end faces of the hammer and the valve member of the pneumatic hammer 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 member and the seat where the valve member is set. Since the valve member is usually made of a relatively high-elasticity material, it is easily damaged.

Therefore, it is necessary to provide a novel and advanced pneumatic hammer to solve the above-mentioned problems.

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

To achieve the above-mentioned purpose, the present invention provides a pneumatic hammer, comprising: a body, comprising an air inlet; a cylinder, connected to the body, comprising a first chamber, a second chamber and a partition portion radially spaced between the first chamber and the second chamber, the partition portion comprising a through hole, the through hole connecting the first chamber and the second chamber; a working piece, arranged at one end of the cylinder; a valve group, accommodated in the second chamber, comprising a seat and a valve member movably arranged on the seat, the valve member comprising a base and a side projection laterally connected to the base, the valve member can be movably closed to close or not close the through hole; and a piston, movably accommodated in the first chamber.

The following is merely an example to illustrate possible implementations of the present invention, but it is not intended to limit the scope of protection for the present invention. The "one" or "at least one" preceding the terms mentioned in the text does not limit the quantity, and it can also be "plural" according to needs. This change in quantity is also within the scope of protection, which should be stated in advance.

Please refer to FIG. 1 to FIG. 10 , which show an embodiment of the present invention. The pneumatic hammer 1 of the present invention includes a body 10 , a cylinder 20 , a working piece 30 , a valve assembly 40 and a piston 50 .

The body 10 includes an air inlet 11. The cylinder 20 is connected to the body 10, and includes a first chamber 21, a second chamber 22, and a partition 23 radially spaced between the first chamber 21 and the second chamber 22. The partition 23 includes a through hole 231, and the through hole 231 connects the first chamber 21 and the second chamber 22. The working piece 30 is disposed at one end of the cylinder 20. The valve assembly 40 is accommodated 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 valve member 42 includes a base 421 and a side protrusion 422 laterally connected to the base. The side protrusion 422 extends into the through hole 231 and can move axially along the through hole 231. The seat 41 includes a communication pipeline 411 connected to the gas of the intake duct 11. The gas from the intake duct 11 flows through the communication pipeline 411 and actuates the valve member 42 to close or not close the through hole 231. The piston 50 is movably accommodated 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 piece 30. When the gas actuates the piston 50 to move back toward the spacer 23, the valve member 42 moves away from the spacer 23 (pushed by the compressed gas or pushed by the piston 50). Thereby, before the piston 50 moves back to contact the spacer 23, it can be buffered by the compressed gas therebetween to reduce the impact on the piston 50, the spacer 23 and the valve 42, thereby 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 located at the next impact initial position, so that a reciprocating impact action can be performed.

The cylinder 20 further includes a first cylinder body 24 and a second cylinder body 25 which are screwed together for easy assembly, replacement and maintenance. The first chamber 21 is located in the first cylinder body 24, the seat 41 is accommodated in the second cylinder body 25, and the spacer 23 is clamped between the first cylinder body 24 and the seat 41.

The cylinder 20 further includes a first pipe 26 and a first exhaust pipe 27 connected to the first chamber 21. The first pipe 26 is in gas communication with the communication line 411. One end of the first pipe 26 is farther from the partition 23 than one end of the first exhaust pipe 27. The first exhaust pipe 27 is connected 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 communication line 411 via the first pipe 26. When the piston 50 moves from the spacer 23 toward the workpiece 30, the gas is squeezed out of the cylinder 20 from the first exhaust pipe 27; after the piston 50 impacts the workpiece 30, the gas from the intake passage 11 flows through the communication pipe 411 and the first pipe 26 into the annular recess 52 and pushes the piston 50 back toward the spacer 23. Preferably, the annular recess 52 gradually deepens toward the spacer 23, which can provide a larger force-bearing area and increase the force for pushing the piston 50 back.

The cylinder 20 further includes a second exhaust pipe 28 connected to the first chamber 21, and the partition 23 further includes a through passage 232, which is connected between the communication pipe 411 and the second exhaust pipe 28. When the piston 50 moves back through the first exhaust pipe 27, the compressed air in the first chamber 21 can be conducted to the communication pipe 411 through the second exhaust pipe 28 and the passage 232, thereby adjusting and changing the air pressure on the two opposite sides of the valve 42, so that the valve 42 is subjected to appropriate pressure when opening and closing, thereby obtaining a stable and reliable opening and closing effect.

Specifically, a convex portion 51 is provided on one end face of the piston 50, and the side protrusion 422 is axially opposite to the convex portion 51 of the piston 50, and the side protrusion 422 is preferably radially spaced from the hole 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 extend into the first chamber 21. When the gas drives the piston 50 to move back toward the spacer 23, the convex portion 51 hits the side protrusion 422 to move the valve 42 away from the spacer 23, thereby preventing the valve 42 from being directly hit and reducing damage. In detail, the side protrusion 422 is plate-shaped and includes two opposite arc surfaces 423. The two arc surfaces 423 match the shape of the inner surface of the through hole 231. The side protrusion 422 can stably move along the inner surface of the through hole 231, and can guide and maintain the valve 42 to move linearly without deviation. In this way, the operation and opening and closing of the valve 42 are more stable and accurate 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 is flush with the end plane 424 of the side protrusion 422, thereby enhancing the stable contact between the protrusion 51 and the side protrusion 422 and the stable and precise operation of the valve 42.

Preferably, the pneumatic hammer 1 further includes a first elastic member 60 and a second elastic member 70, the first elastic member 60 and the second elastic member 70 are axially elastically pressed between the cylinder 20 and the body 10, respectively, and the directions of the axial forces exerted by the first elastic member 60 and the second elastic member 70 on the cylinder 20 are opposite. In this embodiment, the first elastic member 60 is a coil spring and is sleeved on the first cylinder 24 and abuts against the inner wall of a front shell 12 of the body 10, and the second elastic member 70 is a wave-shaped elastic sheet and abuts against the inner wall of the second cylinder 25 and a rear shell 13 of the body 10. The first elastic member 60 and the second elastic member 70 can respectively buffer the impact force generated by the piston 50 impacting forward and returning backward.

1: Pneumatic hammer 10: Body 11: Intake duct 12: Front shell 13: Rear shell 20: Cylinder 21: First chamber 22: Second chamber 23: Partition 231: Through hole 232: Passage 24: First cylinder body 25: Second cylinder body 26: First pipe 27: First exhaust pipe 28: Second exhaust pipe 30: Working piece 40: Valve assembly 41: Seat 411: Connecting pipe 42: Valve piece 421: Base 422: Lateral convexity 423: Arc surface 424: End plane 50: Piston 51: Convexity 511: End plane 52: Concave ring 60: First elastic member 70: Second elastic member

Figure 1 is a three-dimensional diagram of an embodiment of the present invention. Figure 2 is an exploded view of an embodiment of the present invention. Figure 3 is another exploded view of an embodiment of the present invention. Figure 4 is a three-dimensional diagram of a piston of an embodiment of the present invention. Figure 5 is a side view of a piston of an embodiment of the present invention. Figure 6 is a three-dimensional diagram of a valve of an embodiment of the present invention. Figures 7 and 8 are cross-sectional views of a piston of an embodiment of the present invention in an initial position. Figures 9 and 10 are cross-sectional views of a piston of an embodiment of the present invention in an impact position.

1: Pneumatic hammer

10: Body

20: Cylinder

30: Workpiece

Claims (10)

A pneumatic hammer comprises: A body, comprising an air inlet; A cylinder, connected to the body, comprising a first chamber, a second chamber and a partition radially spaced between the first chamber and the second chamber, the partition comprising a through hole, the through hole connecting the first chamber and the second chamber; A working piece, arranged at one end of the cylinder; A valve assembly, accommodated in the second chamber, comprising a seat and a valve member movably arranged on the seat, the valve member comprising a base and a side projection laterally connected to the base, the valve member can movably close or not close the through hole; and A piston, movably accommodated in the first chamber. A pneumatic hammer as described in claim 1, wherein the cylinder further includes a first cylinder body and a second cylinder body with a screw lock, the first chamber is located in the first cylinder body, the seat is accommodated in the second cylinder body, and the spacer is clamped between the first cylinder body and the seat. A pneumatic hammer as described in claim 2, wherein the seat portion includes a connecting pipe connected to the intake gas, the cylinder further includes a second exhaust pipe connected to the first chamber, and the partition portion further includes a through channel connected between the connecting pipe and the second exhaust pipe. A pneumatic hammer as described in claim 1, wherein a convex portion is provided on one end face of the piston, and the side convex portion is axially opposite to the convex portion of the piston. When the gas from the intake passage drives the piston to move back toward the space portion, the convex portion hits the side convex portion to cause the valve member to move away from the space portion. A pneumatic hammer as described in claim 4, wherein the side protrusion is radially spaced from the hole wall of the through hole. A pneumatic hammer as described in claim 4, wherein the side protrusion is movable through the through hole and partially extends into the first chamber. A pneumatic hammer as described in claim 1, wherein the seat portion includes a connecting pipe connected to the intake duct gas, and the cylinder further includes a first pipe and a first exhaust pipe connected to the first chamber, the first pipe is gas-connected to the connecting pipe, a port of the first pipe is farther away from the partition portion than a port of the first exhaust pipe, and the first exhaust pipe is connected to the outside of the cylinder. A pneumatic hammer as described in claim 3, wherein the side projection extends into the through hole and can move axially along the through hole, and the gas from the intake passage flows through the communication pipe and actuates the valve to close or not close the through hole; a convex portion is provided on one end face of the piston, and the side projection is axially opposite to the convex portion of the piston, and when the gas actuates the piston to move back toward the spacer, the convex portion hits the side projection. The convex part causes the valve member to move away from the spacer; the side convex part is plate-shaped and includes two opposite arc surfaces, and the two arc surfaces match the shape of the inner surface of the through hole; the convex part includes an end plane, and the side convex part includes an end plane. When the convex part hits the side convex part, the end plane of the convex part is flat against the end plane of the side convex part; there is a radial spacing between the side convex part and the hole wall of the through hole; the side convex part can move through the through hole. The pneumatic hammer further comprises a first elastic member and a second elastic member. The first elastic member and the second elastic member are axially elastically pressed between the cylinder and the body respectively, and the directions of the axial forces exerted by the first elastic member and the second elastic member on the cylinder are opposite; when the through hole is not closed by the valve member, the gas actuates the piston to impact the working member, and when the gas actuates the piston to move back toward the space portion, the valve member moves away from the space portion. A pneumatic hammer as described in any one of claims 3, 7 and 8, wherein the piston includes an annular recess, and when the piston contacts the workpiece, the annular recess is connected to the gas in the connecting pipeline. A pneumatic hammer as described in claim 9, wherein the annular recess gradually deepens toward the space portion.

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