Single pendulum impact pneumatic wrench

Abstract

The utility model belongs to the technical field of pneumatic wrenches, and discloses a single pendulum impact pneumatic wrench to solve the technical problems of pendulum impact pneumatic wrenches in the prior art, the impact pneumatic wrench comprises a handle body air inlet system, one side of the handle body air inlet system is provided with an engine assembly, and the engine assembly comprises an engine body. An air cylinder is arranged in an engine body, an air inlet hole is formed in the air cylinder, the air inlet hole is communicated with a handle body air inlet system, a blade type engine is arranged in the air cylinder, a front body is arranged on one side of an engine assembly, a pulling shaft is arranged in the front body, a bracket is further arranged in the front body, and a pendulum bob impact block is arranged on one side of the bracket. The pendulum bob impact block is matched with an impact arm on one side of the wrench shaft, a transmission sleeve is installed on one side in the bracket, the transmission sleeve is in matched transmission through a rotor shaft of the vane type engine, and the transmission sleeve, the bracket and the pendulum bob impact block are in matched integrated transmission. According to the utility model, a single pendulum bob impact structure is adopted, a formed forging pendulum bob technology is adopted, the processing is simple, and the processing cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic wrenches, and particularly relates to a single pendulum hammer impact pneumatic wrench. Background Art

[0002] The pendulum hammers of double pendulum hammer impactors belong to special-shaped parts, so in the processing, the processing difficulty is relatively large, the processing process is cumbersome, and it is difficult to guarantee the accuracy of the parts (such as the powerful impact pneumatic wrench disclosed in CN01258210.7).

[0003] Moreover, when assembling, the pin shaft and the pendulum hammer are separated, and the clearance between the pin shaft and the pendulum hammer is relatively large. During the impact process, the mutual wear is relatively serious, resulting in problems such as the decline of the performance of the pneumatic wrench machine, unstable impact, and loud noise.

[0004] In addition, at present, an independent sealing and lubricating component is designed inside the impactor. For example, the striking structure of the impact pneumatic wrench disclosed in 201510067592.3. When processing this kind of sealing component, the phase tolerance with the impactor is required to be relatively high, and the processing difficulty is large. At the same time, it also increases the difficulty of assembly and maintenance. Moreover, when lubricating, a high-viscosity grease is used, which will affect the performance of the pneumatic wrench with a high rotational speed. It will not only cause the reduction of the striking frequency of the impactor, but also affect the output power of the impactor, thereby reducing the working performance of the pneumatic wrench. The prior art cannot solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the technical problems existing in the pendulum hammer impact pneumatic wrench in the prior art, and provide a single pendulum hammer impact pneumatic wrench.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A single pendulum hammer impact pneumatic wrench includes a handle body air intake system. An engine assembly is installed on one side of the handle body air intake system. The engine assembly includes an engine body. A cylinder is installed inside the engine body. An air intake hole is opened on the cylinder, and the air intake hole is communicated with the handle body air intake system. A vane type engine is installed inside the cylinder. A front body is installed on one side of the engine assembly. A wrench shaft is installed inside the front body. A bracket is also installed inside the front body. A pendulum hammer impact block is installed on one side of the bracket. The pendulum hammer impact block cooperates with an impact arm on one side of the wrench shaft. A transmission sleeve is installed on one side inside the bracket. The transmission sleeve is driven by the rotor shaft of the vane type engine in a cooperative manner, and the transmission sleeve is integrally driven in cooperation with the bracket and the pendulum hammer impact block.

[0008] Furthermore, the pendulum hammer impact block is connected to the bracket through a pin shaft, and the pin shaft is in interference fit with the bracket and the pendulum hammer impact block.

[0009] Further, a cylinder front cover is installed on one side of the cylinder close to the front body, and a cylinder rear cover is installed on one side of the cylinder close to the handle body intake system. Deep groove ball bearings are installed between the cylinder front cover, the cylinder rear cover and the rotor shaft.

[0010] Further, a bushing is installed at the contact between the front body and the wrench shaft, and a thrust washer is installed on the wrench shaft between the bushing and the bracket.

[0011] Further, a handle is installed on one side of the front body by bolt fastening.

[0012] Further, a gasket is installed on the rotor shaft between the deep groove ball bearing near the cylinder front cover and the transmission sleeve.

[0013] Further, the handle body intake system includes a handle body, on which an intake valve and a throttle valve are installed, and the intake valve and the throttle valve are communicated with each other, and the throttle valve is communicated with the intake hole.

[0014] The utility model has the following beneficial effects compared with the prior art:

[0015] The utility model adopts a single pendulum hammer impact structure, has a formed forging pendulum hammer technology, is simple to process, and has a low processing cost.

[0016] The pin shaft and the pendulum hammer of the single pendulum hammer impactor of the utility model are designed to be in interference fit, which not only reduces the wear of the pin shaft and the pendulum hammer, but also solves the problem of unstable impact. The impact frequency of the impact is increased, and the labor intensity of the operator is reduced.

[0017] The utility model eliminates the design of independent sealing and lubricating components inside the impact mechanism. When high-pressure air vaporizes high-speed lubricating oil and gas, it enters the rotating engine and the inside of the impact mechanism to achieve the effect of simultaneous steam and oil lubrication, and will not affect the working performance of the pneumatic wrench.

[0018] The compressed air of the utility model enters through the intake valve at the body joint, enters the vane engine through the throttle valve, makes the engine rotate, drives the single pendulum hammer mechanism to rotate, and uses the impact principle of the single pendulum hammer to output torque by impact.

[0019] The pneumatic wrench of the utility model has no speed reduction mechanism, so the rotation speed of the engine can be directly transmitted to the impact mechanism, thus increasing the impact frequency of the impact mechanism, achieving the effects of high output speed, high impact frequency and high torque, and can tighten and disassemble screws at high speed. Description of the Drawings

[0020] Figure 1 is a structural schematic diagram of the utility model.

[0021] Figure 2 is a structural schematic diagram of the impact part of the utility model.

[0022] Figure 3 is Figure 2 the sectional view taken along the A-A direction of

[0023] Figure 4 the structural schematic diagram of the engine assembly of the present utility model.

[0024] Figure 5 is Figure 4 the sectional view taken along the B-B direction of

[0025] Figure 6 the structural schematic diagram of the handle body intake system of the present utility model.

[0026] Figure 7 the schematic diagram of the impact process principle of the present utility model.

[0027] The meanings of the reference numerals are as follows: 1. wrench shaft; 2. front body; 3. handle body; 4. gasket; 5. engine assembly; 6. handle body intake system; 7. impact arm; 8. bracket; 9. thrust washer; 10. pendulum hammer impact block; 11. pin shaft; 12. transmission sleeve; 13. handgrip; 14. bolt; 15. rotor shaft; 16. cylinder front cover; 17. cylinder; 18. vane type engine; 19. cylinder rear cover; 20. bushing; 21. intake valve; 22. throttle valve; 23. engine body; 24. deep groove ball bearing; 25. intake hole. Specific embodiments

[0028] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] As Figures 1-6 shown, a single pendulum hammer impact pneumatic wrench includes a handle body intake system 6, and the handle body intake system 6 includes a handle body 3. An intake valve 21 and a throttle valve 22 are installed on the handle body 3, and the intake valve 21 and the throttle valve 22 are communicated with each other. The handle body intake system 6 in the present application is the same as the handle body intake system solution disclosed in Patent CN201320883881.7.

[0030] An engine assembly 5 is installed on one side of the handle body intake system 6. The engine assembly 5 includes an engine body 23, and the body 23 is fixedly connected to the handle body 3 through bolts. A front body 2 is installed on one side of the engine assembly 5 (the engine body 23 and the front body 2 are fixedly connected through bolts), and a handgrip 13 is fixedly installed on one side of the front body 2 through a bolt 14. A cylinder 17 is installed inside the engine body 23. A cylinder front cover 16 is fixedly installed on the side of the cylinder 17 close to the front body 2 through bolts, and a cylinder rear cover 19 is fixedly installed on the side of the cylinder 17 close to the handle body intake system 6 through bolts. Deep groove ball bearings 24 are installed between the cylinder front cover 16, the cylinder rear cover 19 and the rotor shaft 15. A gasket 4 is installed on the rotor shaft 15 between the deep groove ball bearing 24 close to the cylinder front cover 16 and the transmission sleeve 12.

[0031] An air inlet hole 25 is formed in the cylinder 17. A communication passage is formed between the air inlet hole 25 and the throttle valve 22 of the handle body air inlet system 6. A vane type engine 18 is installed in the cylinder 17. A wrench shaft 1 is installed in the front body 2. A bushing 20 is installed at the contact part between the front body 2 and the wrench shaft 1. A thrust washer 9 is installed on the wrench shaft 1 between the bushing 20 and the bracket 8.

[0032] A bracket 8 is also installed in the front body 2. A pendulum impact block 10 is installed on one side of the bracket 8. The pendulum impact block 10 is connected to the bracket 8 through a pin shaft 11, and an interference fit is provided between the pin shaft 11, the bracket 8, and the pendulum impact block 10.

[0033] The pendulum impact block 10 cooperates with the impact shoulder 7 on one side of the wrench shaft 1. A transmission sleeve 12 is installed on one side inside the bracket 8. The transmission sleeve 12 is driven by the rotor shaft 15 of the vane type engine 18 (gear meshing transmission is provided between the transmission sleeve 12 and the rotor shaft 15), and the transmission sleeve 12 is integrally driven in cooperation with the bracket 8 and the pendulum impact block 10.

[0034] Compressed air enters the handle body 3 through the air inlet valve 21 of the handle body air inlet system 6. The air path of the handle body 3 enters the engine body 23 after passing through the throttle valve 21, and then enters the vane type engine 18 through the air inlet hole 25 of the cylinder 17, enabling the vane type engine 18 to start normal operation.

[0035] As Figure 7 shown in Figure a, when the pneumatic wrench has not started tightening the nut, the pneumatic wrench is idling.

[0036] As Figure 7 shown in Figure b, when the pneumatic wrench starts tightening the nut, the wrench shaft 1 is stressed and in a relatively stationary state. Due to centrifugal force, the pendulum impact block 10 impacts the impact shoulder 7 of the wrench shaft 1 once.

[0037] As Figure 7 shown in Figure c, after the pendulum impact block 10 impacts once, it quickly rebounds.

[0038] As Figure 7 shown in Figure d, after the pendulum impact block 10 rebounds, due to inertia, it bypasses the relatively stationary wrench shaft 1, completing one impact process.

Claims

1. A single pendulum impact gas trigger, comprising a handle air intake system (6), an engine assembly (5) being mounted on one side of the handle air intake system (6), wherein: The engine assembly (5) comprises an engine body (23), a cylinder (17) is installed in the engine body (23), an air inlet (25) is opened on the cylinder (17), the air inlet (25) is connected to the handle body air inlet system (6), a vane engine (18) is installed in the cylinder (17), a front body (2) is installed on one side of the engine assembly (5), a pull shaft (1) is installed in the front body (2), a bracket (8) is also installed in the front body (2), a pendulum impact block (10) is installed on one side of the bracket (8), the pendulum impact block (10) cooperates with an impact wing (7) on one side of the pull shaft (1), a transmission sleeve (12) is installed on one side of the bracket (8), the transmission sleeve (12) is driven by the rotor shaft (15) of the vane engine (18), and the transmission sleeve (12) cooperates with the bracket (8) and the pendulum impact block (10) to be transmitted as a whole.

2. A single pendulum impact gas trigger according to claim 1, characterized in that: The pendulum impact block (10) and the bracket (8) are connected via a pin shaft (11), and the pin shaft (11), the bracket (8), and the pendulum impact block (10) are interference fit.

3. A single pendulum impact gas trigger according to claim 2, characterized in that: A cylinder front cover (16) is installed on the side of the cylinder (17) close to the front body (2), and a cylinder rear cover (19) is installed on the side of the cylinder (17) close to the handle body air intake system (6). Deep groove ball bearings (24) are installed between the cylinder front cover (16), the cylinder rear cover (19) and the rotor shaft (15).

4. The single pendulum impact gas trigger according to claim 3, characterized in that: A bushing (20) is installed at the contact point between the front body (2) and the lever shaft (1), and a thrust washer (9) is installed on the lever shaft (1) between the bushing (20) and the bracket (8).

5. The single pendulum impact gas trigger according to claim 1, characterized in that: A handle (13) is fastened to one side of the front body (2) via a bolt (14).

6. The single pendulum impact gas trigger according to claim 3, characterized in that: A gasket (4) is mounted on the rotor shaft (15) between the deep groove ball bearing (24) near the cylinder front cover (16) and the transmission sleeve (12).

7. The single pendulum impact gas trigger according to claim 1, characterized in that: The handle body air intake system (6) comprises a handle body (3), on which an air intake valve (21) and a throttle valve (22) are mounted, wherein the air intake valve (21) and the throttle valve (22) are connected, and the throttle valve (22) is connected to an air intake hole (25).

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