Pneumatic wrench

Abstract

The utility model discloses a pneumatic wrench which comprises a rear shell, a front shell and a plug, the rear shell comprises a shell body and a handle, the handle is provided with an air inlet and an air inlet channel which are communicated, the handle is provided with an air flowing channel, the air flowing channel is communicated with an air outlet, the air outlet is communicated with a cavity of the shell body, and the handle is provided with an exhaust port and an exhaust channel which are communicated. The exhaust port is communicated with the cavity of the shell, and the front shell is installed on the rear shell. The air flowing channel is provided with a through hole, the plug is plugged in the through hole, and the plug limits the front shell. The front shell and the handle are connected through the plug, a screw used for connecting the front shell and the handle is omitted, screw hole tapping operation does not need to be carried out on the connecting position, used for connecting the front shell, of the handle, and the effects that the handle technological process is short, and cost is reduced are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic tool technology, specifically relating to pneumatic wrenches. Background Technology

[0002] Pneumatic transmission evolved from and developed from pneumatic and hydraulic technologies. It uses compressed air as the working medium to transmit motion and power. Because air is an inexhaustible source of power, pneumatic transmission produces less pollution and therefore has broad prospects in the field of automation. It is widely used in industries such as textiles, machinery, automobiles, electronics, military, steel, chemicals, food, and packaging. With the development of atomic energy, space technology, and computer technology, pneumatic transmission technology will undoubtedly be applied even more extensively in various industrial sectors.

[0003] Pneumatic wrenches are based on the principle of air pressure transmission and are widely used in many industries, such as automobile repair, heavy equipment maintenance, product assembly, major construction projects, installation of wire thread inserts, and any other place where high torque output is needed.

[0004] Existing pneumatic wrenches consist of a rear shell and a front shell. For example, a Chinese utility model patent entitled "A Pneumatic Wrench" (authorization announcement number: CN222553410U) discloses that the front and rear shells are fixed together by bolts, while the handle is fixed to both the front and rear shells. Specifically, the handle is first injection molded, then the screw holes in the handle are tapped, then glue is applied to the screws, and finally, the handle is fixed to both the front and rear shells using screws. Although this achieves a fixed connection between the front shell and the handle, it results in a long handle manufacturing process and high costs. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art and to provide a pneumatic wrench that shortens the handle manufacturing process and reduces costs.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A pneumatic wrench includes a rear shell and a front shell. The rear shell includes a housing and a handle. The handle has a connected air inlet and air inlet channel, and an air flow channel connected to an air outlet. Air from the air outlet enters a drive device within the housing cavity. The handle has a connected exhaust port and exhaust channel, and the exhaust port connects to the housing cavity. Air discharged from the drive device passes through the cavity, exhaust port, and exhaust channel before being discharged. The front shell is mounted on the rear shell. The wrench is characterized by further including a plug. The air flow channel has a through hole, and the plug seals the through hole, limiting the movement of the front shell.

[0008] Furthermore, the plug is equipped with a limiting protrusion, which limits the airflow channel to the outside.

[0009] Furthermore, the plug is provided with a connecting part, the front shell is provided with a connecting hole, and the connecting part is located in the connecting hole.

[0010] Furthermore, a muffler is fixed to the plug, and the muffler and exhaust port are set accordingly.

[0011] Furthermore, the housing is provided with a boss, the boss is provided with a mounting hole, the front housing is provided with a threaded hole, the mounting hole is provided with a bolt, and the bolt is threaded into the threaded hole.

[0012] Furthermore, it also includes a housing with a cavity, and the handle is located in the cavity.

[0013] Furthermore, the outer shell is provided with a cover plate, the cover plate has a groove, and the rear end of the shell is embedded in the groove.

[0014] Furthermore, the cover plate is provided with a countersunk groove, into which the end of the bolt is recessed.

[0015] Furthermore, the cover plate is provided with a limiting part, and the limiting part is provided with a limiting groove, with the boss embedded in the limiting groove.

[0016] Furthermore, the surface of the outer casing is textured with anti-slip patterns.

[0017] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0018] After the handle is injection molded, this utility model uses a plug to seal the through hole of the air flow channel on the handle. Then, the front shell is placed in front of the rear shell. At this time, the plug limits the front shell and the handle is connected by the plug. The screw used to connect the front shell and the handle is eliminated, and there is no need to tap the screw hole at the connection point of the handle to the front shell. It has the effect of shortening the handle process and reducing costs. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the pneumatic wrench of this utility model;

[0021] Figure 2 for Figure 1 The left view;

[0022] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0023] Figure 4 This is a schematic diagram of the pneumatic wrench of this utility model without the outer casing installed;

[0024] Figure 5 This is a schematic diagram of the rear shell structure in this utility model;

[0025] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0026] Figure 7 This is a schematic diagram of the front shell structure in this utility model;

[0027] Figure 8 This is a schematic diagram of the connection between the outer shell and the cover plate in this utility model;

[0028] Figure 9 for Figure 8 Rear structural diagram;

[0029] Figure 10 This is a schematic diagram of the structure in which the plug and muffler are installed in the rear shell in this utility model;

[0030] Figure 11 This is a schematic diagram of the connection between the plug and the muffler in this utility model;

[0031] Figure 12 This is a schematic diagram of the structure of the sealing ring installed on the plug in this utility model;

[0032] Figure 13 This is a schematic diagram of the structure in which the plug is installed in the rear shell in this utility model;

[0033] Figure 14 This is a schematic diagram of the structure of the plug without a muffler installed in this utility model.

[0034] In the diagram, 1-rear shell; 11-shell; 12-handle; 13-air inlet; 14-air inlet channel; 15-air flow channel; 16-air outlet; 17-cavity; 18-exhaust port; 19-exhaust channel; 110-through hole; 111-bore; 112-rear end; 113-mounting hole; 114-slot.

[0035] 2-Front housing; 21-Connecting hole; 22-Threaded hole;

[0036] 31-Plug; 32-Limiting protrusion; 33-Connecting part; 34-Sealing ring;

[0037] 4-Silencer;

[0038] 5- Bolts;

[0039] 6-Outer shell; 61-Cavity; 62-Cover plate; 63-Gate; 64-Limiting part; 65-Limiting groove; 66-Limiting hole; 67-Counterhead groove; 68-Anti-slip texture; 69-Clamping part;

[0040] 7-Drive unit;

[0041] 8-Strike Components. Detailed Implementation

[0042] like Figures 1 to 14 As shown, this utility model pneumatic wrench is based on the principle of pneumatic transmission and features lighter weight and more stable torque output.

[0043] Example 1,

[0044] The pneumatic wrench includes a rear shell 1 and a front shell 2. The rear shell 1 includes a housing 11 and a handle 12. The housing 11 and the handle 12 are integrally molded by injection molding, which can reduce quality defects of the rear shell 1. At the same time, the injection molding technology helps to reduce production costs by reducing production steps and shortening the production cycle, and allows for the design of more complex rear shells 1.

[0045] The handle 12 is provided with an air inlet 13 and an air inlet channel 14 that are connected together. The air inlet 13 is connected to an air source. The handle 12 is provided with an air flow channel 15 that is connected to an air outlet 16. The air outlet 16 is connected to the cavity 17 of the housing 11. The handle 12 is provided with an exhaust port 18 and an exhaust channel 19 that are connected together. The exhaust port 18 is connected to the cavity 17 of the housing 11. The air from the air source passes through the air inlet 13, the air inlet channel 14, the air flow channel 15 and the air outlet 16 in sequence, and then enters the drive device 7 in the cavity 17 to provide air for the drive device 7. The drive device 7 drives the striking component 8. The air discharged by the drive device 7 passes through the cavity 17, the exhaust port 18 and the exhaust channel 19, and is finally discharged from the opening of the exhaust channel 19.

[0046] The housing 11 has a boss 111 with a mounting hole 113. The front housing 2 has a threaded hole 22, and a bolt 5 is installed in the mounting hole 113. The bolt 5 is threaded into the threaded hole 22, allowing the front housing 2 to be detachably installed on the rear housing 1. This invention provides sufficient space for the bolt 5 by providing a boss 111 on the outer side of the housing 11. Furthermore, the boss 111 has specific dimensions, giving it good strength and increasing the load-bearing capacity of the bolt 5, while also increasing the overall strength of the housing 11.

[0047] After the handle 12 is injection molded, this utility model uses a plug 31 to seal the through hole 110 of the air flow channel 15 on the handle 12 (e.g., ...). Figure 13As shown, the plug 31 of this invention is cylindrical, and the through hole 110 is circular. The plug 31 and the through hole 110 can also have other shapes or other interlocking connection methods. To ensure the sealing of the plug 31 in the through hole 110, an O-ring seal 34 can be fitted onto the plug 31. When the plug 31 is placed in the through hole 110, the deformed seal 34 fits tightly against the through hole 110, preventing air leakage. The plug 31 has a limiting protrusion 32, which is positioned on the outside of the airflow channel 15, ensuring that the plug 31 extends into the through hole 110 to a predetermined length, effectively connecting the plug 31 within the through hole 110 while also preventing air leakage. The plug 31 has a connecting part 33, and the front shell 2 has a connecting hole 21. The connecting part 33 is cylindrical, and the connecting hole 21 is a round hole. When the front shell 2 is positioned on the front side of the rear shell 1, the connecting part 33 is located in the connecting hole 21, thus limiting the position of the plug 31 on the front shell 2. This invention connects the front shell 2 and the handle 12 via the plug 31, eliminating the need for screws used to connect the front shell 2 and the handle 12. It also eliminates the need for tapping the screw holes at the connection point of the handle 12 to the front shell 2, resulting in a shorter process flow and reduced cost for the handle 12.

[0048] This invention adds a shell 6, which has a cavity 61. The handle 12 is disposed in the cavity 61, so that the shell 6 encloses the handle 12, protecting it and increasing the service life of the pneumatic wrench. This invention manufactures the shell 6 separately, and the surface of the shell 6 is formed with anti-slip texture 68, so that the handle 12 has an anti-slip function.

[0049] The outer shell 6 is equipped with a cover plate 62. The outer shell 6 and the cover plate 62 are integrally molded by injection molding, giving them good strength. The cover plate 62 has a groove 63, into which the rear end 112 of the shell 11 is embedded. The cover plate 62 supports the shell 11, increases its strength, and meets the requirements for the rotation of the knob in the rear shell 1. The cover plate 62 has a limiting hole 66 and a countersunk groove 67. The threaded rod of the bolt 5 passes through the limiting hole 66, and the end of the bolt 5 is recessed into the countersunk groove 67, preventing the end of the bolt 5 from protruding, improving aesthetics, and preventing accidental collisions or scratches from objects or people, thus improving the safety of product use. It also allows the end of the bolt 5 to distribute the load when under force, reducing local stress concentration, thereby protecting the cover plate 62 from damage and reducing the risk of bolt 5 loosening, ensuring the stability and reliability of the connection between the front shell 2 and the rear shell 1. The cover plate 62 is provided with a limiting part 64, and the limiting part 64 is provided with a limiting groove 65. The boss 111 is embedded in the limiting groove 65, so that the cover plate 62 is positioned on the housing 11, which facilitates the quick installation of the bolts 5 and improves the overall strength of the rear housing 1. In order to improve the stability of the connection between the cover plate 62 and the housing 11, the housing 11 is formed with a retaining groove 114, and the inner side of the cover plate 62 is formed with a locking part 69, which is embedded in the retaining groove 114.

[0050] Example 2,

[0051] Based on the structure of Embodiment 1 above, this utility model adds a silencer 4 (such as...). Figure 10 and Figure 11 (As shown). The technical solution of using the silencer 4 in a pneumatic wrench is prior art. For example, the prior art discloses an invention patent entitled "A Pneumatic Wrench with a Pinless Strike Mechanism" (application publication number: CN115741561A), which installs the silencer 4 in the opening of the exhaust channel 19. This utility model reduces noise at the exhaust port 18 by placing the silencer 4 in the cavity 17 of the housing 11, and the silencer 4 and the exhaust port 18 are correspondingly arranged, so that the silencer 4 has sufficient installation space. The plug 31 of this utility model is fixedly connected to the silencer 4, realizing the fixation of the silencer 4 at the exhaust port 18, which can reduce the noise of the pneumatic wrench.

[0052] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A pneumatic wrench, comprising: a rear shell, the rear shell comprising a shell body and a handle, the handle being provided with an air inlet and an air inlet channel in communication, the handle being provided with an air flow channel, the air flow channel being in communication with an air outlet, air from the air outlet entering a driving device in a cavity of the shell body, the handle being provided with an air outlet and an air outlet channel in communication, the air outlet being in communication with the cavity of the shell body, air discharged by the driving device being discharged through the cavity, the air outlet and the air outlet channel; a front shell, the front shell being mounted at the rear shell; characterized in that it further comprises: a plug, the air flow channel being provided with a through hole, the plug being sealed in the through hole, the plug limiting the front shell.

2. The pneumatic wrench of claim 1, wherein: The plug is provided with a limiting protrusion, the limiting protrusion limiting the outside of the air flow channel.

3. The pneumatic wrench of claim 1, wherein: The plug is provided with a connecting portion, the front shell is provided with a connecting hole, and the connecting portion is arranged in the connecting hole.

4. The pneumatic wrench of claim 3, wherein: The plug is fixed with a silencer, the silencer is arranged in the cavity and is correspondingly arranged with the air outlet.

5. The pneumatic wrench of claim 1, wherein: The shell body is provided with a boss, the boss is provided with a mounting hole, the front shell is provided with a threaded hole, a bolt is arranged in the mounting hole, and the bolt is threadedly connected in the threaded hole.

6. The pneumatic wrench of claim 5, wherein: Further comprising an outer shell, the outer shell being provided with a cavity, the handle being arranged in the cavity.

7. The pneumatic wrench of claim 6, wherein: The outer shell is provided with a cover plate, the cover plate being provided with a slot, and the rear end of the shell body is embedded in the slot.

8. The pneumatic wrench of claim 7, wherein: The cover plate is provided with a limiting hole and a countersunk groove, the threaded rod of the bolt passes through the limiting hole, and the end of the bolt is sunk in the countersunk groove.

9. The pneumatic wrench of claim 7, wherein: The cover plate is provided with a limiting portion, the limiting portion is provided with a limiting groove, and the boss is embedded in the limiting groove.

10. The pneumatic wrench of claim 6, wherein: The surface of the outer shell is provided with anti-skid lines.

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