Single-ring hammer striking assembly of pneumatic wrench

Abstract

The utility model provides a single-ring hammer striking assembly of a pneumatic wrench, and belongs to the technical field of pneumatic tools. The pneumatic wrench solves the technical problems that when an existing pneumatic wrench with a single hammer works, vibration is too large, and comfort is poor. A large receding groove and a small receding groove are formed in a striking block of the single-ring hammer striking assembly of the pneumatic wrench, a striking face matched with a striking protrusion is formed between the large receding groove and the small receding groove, and weight reduction grooves or weight reduction holes are formed in the left side and the right side of the side, close to the small receding groove, of the striking block. The lightening grooves or lightening holes are symmetrically formed in the left side and the right side of the striking block. The weight reducing grooves or the weight reducing holes are formed in the two sides of the striking block, so that the weights of the upper side and the lower side of the striking block are close or the same, the situation that the gravity center moving range of the single-ring hammer striking assembly is too large in the process that the striking block rotates to strike the striking shaft is avoided, and the vibration amplitude during working of a pneumatic wrench is reduced; and the holding comfort and the working efficiency of workers are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pneumatic tool technical field, especially point to a single ring hammer strike subassembly of pneumatic wrench. BACKGROUND

[0002] Pneumatic wrench is with compressed air as working medium, is used to tighten and disassemble threaded fastener. Pneumatic wrench is widely used in the assembly of automobile, ship and other industries due to convenient use, low cost, no pollution and other advantages.

[0003] The existing pneumatic wrench whether single ring hammer strike subassembly or double ring hammer strike subassembly, the middle part of the strike block is provided with a large displacement slot and a small displacement slot, the large displacement slot and the small displacement slot are combined to form a strike hole for the strike shaft to pass through, and a strike surface is formed between the large displacement slot and the small displacement slot and cooperates with the strike protrusion on the strike shaft, as shown in the drawings of the utility model with application number 202120575408.7, but when the strike block is used for the double ring hammer strike subassembly, the two strike blocks move in opposite directions, which can balance the entire strike subassembly during work, and the vibration of the pneumatic wrench is relatively small, but when the strike block is used for the single ring hammer strike subassembly, the size of the large displacement slot and the small displacement slot is different, which leads to uneven mass distribution on both sides of the strike block, and during the working process of the strike subassembly, the vibration of the pneumatic wrench is large due to the movement of the strike block, which affects the comfort of holding and the work efficiency of workers, and also more easily causes the wear of various parts of the pneumatic wrench, affecting the service life of the pneumatic wrench. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a single ring hammer strike subassembly capable of reducing vibration.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A single ring hammer strike subassembly of a pneumatic wrench, comprising a strike frame, a strike shaft, a strike block and a strike pin, the strike block is movably installed in the strike frame through the strike pin, the strike shaft passes through the strike frame and the strike block, the strike shaft is provided with a strike protrusion cooperating with the strike block, the strike block is provided with a large displacement slot and a small displacement slot, a strike surface cooperating with the strike protrusion is formed between the large displacement slot and the small displacement slot, characterized in that: the left and right sides of the strike block close to the small displacement slot are each provided with a weight-reducing groove or a weight-reducing hole, and the weight-reducing grooves or the weight-reducing holes are symmetrically arranged on the left and right sides of the strike block.

[0007] The weight of the upper and lower sides of the striking block is close to or the same by setting the weight-reducing grooves or holes on both sides of the striking block, so that the center of gravity of the single-ring hammer striking assembly does not move too much during the process of the striking block rotating and impacting the striking shaft, which is beneficial to reduce the vibration amplitude of the pneumatic wrench during work, improve the comfort of holding and the work efficiency of workers, and the reduced vibration amplitude of the pneumatic wrench during work is beneficial to reduce the wear of each part and improve the overall service life of the pneumatic wrench.

[0008] In the single-ring hammer striking assembly of the pneumatic wrench, the weight-reducing grooves are in a circular arc shape, and the two sides of the weight-reducing grooves each have a circular arc-shaped connecting part.

[0009] The circular arc-shaped weight-reducing grooves and connecting parts can avoid stress concentration, which is beneficial to improve the overall structural strength of the striking block, and the more rounded outer periphery can also improve the stability of the striking block during rotation and reduce wind resistance.

[0010] In the single-ring hammer striking assembly of the pneumatic wrench, the weight of the side of the striking block close to the small displacement groove is close to or the same as the weight of the side of the striking block close to the large displacement groove.

[0011] The weight of the upper and lower sides of the striking block is close to or the same, so that the center of gravity of the single-ring hammer striking assembly does not move too much during the process of the striking block rotating and impacting the striking shaft, which is beneficial to reduce the vibration amplitude of the pneumatic wrench during work, improve the comfort of holding and the work efficiency of workers.

[0012] In the single-ring hammer striking assembly of the pneumatic wrench, the outer periphery of the side of the striking block close to the small displacement groove is provided with a first pin groove, and the outer periphery of the side of the striking block close to the large displacement groove is provided with a second pin groove, the striking pin has two, and the two striking pins respectively pass through the striking frame and extend into the first pin groove and the second pin groove, the width of the second pin groove is greater than the width of the first pin groove, and the striking pin can move relative to the striking block along the width direction of the second pin groove.

[0013] The cooperation of the first pin groove, the second pin groove and the striking pin can realize the connection of the striking block and the striking frame, and the wider design of the second pin groove can make the striking pin move along the second pin groove, so as to ensure that when the striking block rotates with the striking frame, the striking block can move relative to the second pin shaft after the striking surface on the striking block impacts the striking protrusion of the striking shaft, so that the striking shaft enters the small displacement groove of the striking block, and the striking block and the striking shaft are not stuck, so that the pneumatic wrench can work normally.

[0014] In the single-ring hammer striking assembly of the pneumatic wrench, an outward protruding limiting protrusion is formed on the outer circumferential surface of the striking block near the small displacement slot, a second pin slot is arranged on the outer circumferential surface of the striking block near the large displacement slot, two striking pins pass through the striking frame and extend into the second pin slot, the striking frame is provided with a limiting groove matched with the limiting protrusion, the limiting protrusion can be inserted into the limiting groove and rotate relative to the limiting groove, and the width of the second pin slot is greater than the width of the limiting groove, so that the striking pin can move relative to the striking block along the width direction of the second pin slot.

[0015] The limiting protrusion, the limiting groove, the second pin slot and the striking pin are matched to realize the connection of the striking block and the striking frame, and the wider second pin slot can make the striking pin move along the second pin slot, so that when the striking surface on the striking block collides with the striking protrusion of the striking shaft, the striking block can move relative to the second pin shaft, the striking shaft enters the small displacement slot of the striking block, the striking block and the striking shaft are prevented from being stuck, and the pneumatic wrench can work normally.

[0016] In the single-ring hammer striking assembly of the pneumatic wrench, an outward protruding limiting protrusion is formed on the outer circumferential surface of the striking block near the small displacement slot, a second pin slot is arranged on the outer circumferential surface of the striking block near the large displacement slot, two striking pins pass through the striking frame and extend into the second pin slot, the striking frame is provided with a limiting groove matched with the limiting protrusion, the limiting protrusion can be inserted into the limiting groove and rotate relative to the limiting groove, and the width of the second pin slot is greater than the width of the limiting groove, so that the striking pin can move relative to the striking block along the width direction of the second pin slot.

[0017] The distance between the connecting slot, the weight-reducing slot and the outer circumferential surface of the striking block is limited, so that after the weight-reducing slot is arranged, the upper part of the striking block still has sufficient structural strength.

[0018] Compared with the prior art, the technical effects of the pneumatic wrench are as follows:

[0019] The weight-reducing slots or holes are arranged on the two sides of the striking block, so that the weights of the upper and lower sides of the striking block are close to or the same, the range of movement of the center of gravity of the single-ring hammer striking assembly during the process that the striking block rotates and collides with the striking shaft is reduced, the vibration amplitude of the pneumatic wrench during work is reduced, the comfort of holding and the work efficiency of workers are improved. ACCURATE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the pneumatic wrench. Figure 1 .

[0021] Figure 2 It is a perspective view of the striking block of the pneumatic wrench.

[0022] Figure 3 It is a front view of the striking block of the pneumatic wrench.

[0023] Figure 4This is a schematic diagram of the overall structure of this utility model. Figure 2

[0024] In the diagram, 1. Strike block; 11. Large clearance groove; 12. Small clearance groove; 13. Connecting groove; 131. Strike surface; 14. Weight reduction groove; 141. Connecting part; 15. First pin groove; 16. Second pin groove; 17. Limiting protrusion; 2. Strike frame; 21. Limiting groove; 3. Strike shaft; 31. Strike protrusion; 4. Strike pin. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] The single-ring hammer striking assembly of this pneumatic wrench includes a striking frame 2, a striking shaft 3, a striking block 1, and a striking pin 4. The striking block 1 is movably installed in the striking frame 2 via the striking pin 4. The striking shaft 3 passes through the striking frame 2 and the striking block 1. The striking shaft 3 is provided with a striking protrusion 31 that cooperates with the striking block 1. The striking block 1 is provided with a large clearance groove 11 and a small clearance groove 12. A striking surface 131 that cooperates with the striking protrusion 31 is formed between the large clearance groove 11 and the small clearance groove 12. The striking block 1 is characterized in that: a weight reduction groove 14 or a weight reduction hole is provided on both the left and right sides of the side of the striking block 1 closest to the small clearance groove 12. The weight reduction groove 14 or the weight reduction hole are symmetrically arranged on the left and right sides of the striking block 1. In this single-ring hammer impact assembly, by setting weight-reducing grooves 14 or weight-reducing holes on both sides of the impact block 1, the weight on the upper and lower sides of the impact block 1 is made close or the same. This avoids excessive movement of the center of gravity of the single-ring hammer impact assembly during the rotation of the impact block 1 and impact of the impact shaft 3. This helps to reduce the vibration amplitude of the pneumatic wrench during operation, improves the comfort of holding and the work efficiency of the worker. Furthermore, the reduced vibration amplitude of the pneumatic wrench during operation helps to reduce the wear of various parts and improve the overall service life of the pneumatic wrench.

[0027] like Figures 1-4 As shown, the weight-reducing groove 14 is arc-shaped, and both sides of the weight-reducing groove 14 have arc-shaped connecting parts 141. The arc-shaped weight-reducing groove 14 and connecting parts 141 can avoid stress concentration, which is beneficial to improving the overall structural strength of the impact block 1. At the same time, the more rounded outer circumference can also improve the stability of the impact block 1 when rotating and reduce wind resistance.

[0028] Furthermore, the weight of the side of the striking block 1 closest to the small clearance groove 12 is close to or the same as the weight of the side of the striking block 1 closest to the large clearance groove 11. The weight of the upper and lower sides of the striking block 1 is close to or the same, which avoids excessive movement of the center of gravity of this single-ring hammer striking assembly during the rotation of the striking block 1 and impact of the striking shaft 3. This helps to reduce the amplitude of vibration when the pneumatic wrench is working, improve the comfort of holding it and the work efficiency of the worker.

[0029] As shown in Figures 1-3 The first pin groove 15 is arranged on the outer circumferential surface of the hitting block 1 close to the small let-in slot 12, and the second pin groove 16 is arranged on the outer circumferential surface of the hitting block 1 close to the large let-in slot 11. The two hitting pins 4 pass through the hitting frame 2 and extend into the first pin groove 15 and the second pin groove 16, respectively. The width of the second pin groove 16 is greater than that of the first pin groove 15, and the hitting pin 4 can move relative to the hitting block 1 along the width direction of the second pin groove 16. The cooperation of the first pin groove 15, the second pin groove 16 and the hitting pin 4 can realize the connection of the hitting block 1 and the hitting frame 2. The wider design of the second pin groove 16 can make the hitting pin 4 move along the second pin groove 16, thereby ensuring that after the hitting surface 131 on the hitting block 1 collides with the hitting protrusion 31 of the hitting shaft 3 when the hitting block 1 rotates with the hitting frame 2, the hitting block 1 can move relative to the second pin shaft, so that the hitting shaft 3 enters the small let-in slot 12 of the hitting block 1, ensuring that the hitting block 1 and the hitting shaft 3 will not be stuck, and the pneumatic wrench can work normally.

[0030] As another solution, as shown in Figure 4 The hitting block 1 is formed with a limiting protruding rib 17 protruding outward on the outer circumferential surface close to the small let-in slot 12. The hitting block 1 is provided with a second pin groove 16 on the outer circumferential surface close to the large let-in slot 11. The two hitting pins 4 pass through the hitting frame 2 and extend into the second pin groove 16. The hitting frame 2 is provided with a limiting groove 21 matched with the limiting protruding rib 17. The limiting protruding rib 17 can be inserted into the limiting groove 21 and rotate relative to the limiting groove 21. The width of the second pin groove 16 is greater than that of the limiting groove 21, and the hitting pin 4 can move relative to the hitting block 1 along the width direction of the second pin groove 16. The cooperation of the limiting protruding rib 17, the limiting groove 21, the second pin groove 16 and the hitting pin 4 can realize the connection of the hitting block 1 and the hitting frame 2. The wider design of the second pin groove 16 can make the hitting pin 4 move along the second pin groove 16, thereby ensuring that after the hitting surface 131 on the hitting block 1 collides with the hitting protrusion 31 of the hitting shaft 3 when the hitting block 1 rotates with the hitting frame 2, the hitting block 1 can move relative to the second pin shaft, so that the hitting shaft 3 enters the small let-in slot 12 of the hitting block 1, ensuring that the hitting block 1 and the hitting shaft 3 will not be stuck, and the pneumatic wrench can work normally.

[0031] Further, the connection groove 13 recessed outward is formed at the connection position of the large let-in slot 11 and the small let-in slot 12. The hitting surface 131 is formed at the upper groove wall of the connection groove 13. The distance between the groove wall of the connection groove 13 and the groove wall of the weight-reducing groove 14 and the outer circumferential surface of the hitting block 1 is greater than or equal to the shortest distance between the large let-in slot 11 and the second pin groove 16. The distance between the connection groove 13, the weight-reducing groove 14 and the outer circumferential surface of the hitting block 1 can ensure that after the weight-reducing groove 14 is arranged, the upper part of the hitting block 1 still has sufficient structural strength.

[0032] The above embodiments are only preferred embodiments of the utility model, not to limit the protection scope of the utility model thus, all equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope defined by the utility model claims.

Claims

1. A single ring hammer striking assembly of a pneumatic wrench, comprising a striking frame (2), a striking shaft (3), a striking block (1) and a striking pin (4), the striking block (1) is movably installed in the striking frame (2) through the striking pin (4), the striking shaft (3) passes through the striking frame (2) and the striking block (1), the striking shaft (3) is provided with a striking protrusion (31) matched with the striking block (1), the striking block (1) is provided with a large displacement slot (11) and a small displacement slot (12), a striking surface (131) matched with the striking protrusion (31) is formed between the large displacement slot (11) and the small displacement slot (12), characterized in that: The hitting block (1) is provided with a weight-reducing groove (14) or a weight-reducing hole on the left and right sides of the side close to the small displacement slot (12), and the weight-reducing groove (14) or the weight-reducing hole is symmetrically arranged on the left and right sides of the hitting block (1).

2. A single ring hammer striking assembly for a pneumatic wrench as defined in claim 1 wherein: The weight-reducing groove (14) is in a circular arc shape, and the two sides of the weight-reducing groove (14) are provided with a connecting part (141) in a circular arc shape.

3. A single ring hammer striking assembly for a pneumatic wrench as defined in claim 1 wherein: The weight of the side of the hitting block (1) close to the small displacement slot (12) is close to or the same as the weight of the side of the hitting block (1) close to the large displacement slot (11).

4. A single ring hammer striking assembly for a pneumatic wrench as defined in claim 1 or 2 or 3, wherein: The hitting block (1) is provided with a first pin groove (15) on the outer periphery close to the small displacement slot (12) and a second pin groove (16) on the outer periphery close to the large displacement slot (11), the hitting pin (4) has two, the two hitting pins (4) pass through the hitting frame (2) and extend into the first pin groove (15) and the second pin groove (16), the width of the second pin groove (16) is greater than the width of the first pin groove (15), and the hitting pin (4) can move relative to the hitting block (1) along the width direction of the second pin groove (16).

5. A single ring hammer striking assembly for a pneumatic wrench as defined in claim 1 or 2 or 3 wherein: The hitting block (1) is provided with a second pin groove (16) on the outer periphery close to the large displacement slot (11), the two hitting pins (4) pass through the hitting frame (2) and extend into the second pin groove (16), the hitting frame (2) is provided with a limiting groove (21) matched with the limiting convex rib (17), the limiting convex rib (17) can be inserted into the limiting groove (21) and rotate relative to the limiting groove (21), the width of the second pin groove (16) is greater than the width of the limiting groove (21), and the hitting pin (4) can move relative to the hitting block (1) along the width direction of the second pin groove (16).

6. A single ring hammer striking assembly for a pneumatic wrench as defined in claim 1 or 2 or 3 wherein: The connection between the large displacement slot (11) and the small displacement slot (12) is formed with an outwardly recessed connecting groove (13), the hitting surface (131) is formed at the upper groove wall of the connecting groove (13), and the distance between the groove wall of the connecting groove (13) and the groove wall of the weight-reducing groove (14) and the outer periphery of the hitting block (1) is greater than or equal to the shortest distance between the large displacement slot (11) and the second pin groove (16).

Images