Pneumatic wrench

Abstract

The utility model discloses a pneumatic wrench which comprises an outer shell, an air cylinder, a valve sleeve and a throttling core, the outer shell is provided with an air inlet channel, the air cylinder is arranged in the outer shell, the valve sleeve is provided with a forward rotation air inlet hole and a reverse rotation air inlet hole which are communicated with the air cylinder, the valve sleeve is provided with a main air inlet hole communicated with the air inlet channel, and the throttling core is arranged in the valve sleeve. The throttling core moves in the axis direction of the valve sleeve, and the valve sleeve is detachably connected to the air cylinder. When the valve sleeve breaks down, the valve sleeve can be detached from the air cylinder, technicians are allowed to rapidly separate the air cylinder from the valve sleeve, and therefore the maintenance process is simplified, meanwhile, the damaged valve sleeve can be independently replaced instead of the whole pneumatic wrench, the maintenance cost can be reduced, economic benefits can be improved, and the service life of the pneumatic wrench can be prolonged. And the safety and the reliability are improved.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic tool technology, specifically relating to a pneumatic wrench. 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] In existing technology, the forward and reverse air inlets of the valve sleeve are connected to the cylinder, and the throttle core moves left and right within the valve sleeve to achieve the forward and reverse rotation of the pneumatic wrench. However, when the valve sleeve malfunctions, it cannot be removed from the cylinder independently, making the entire repair process cumbersome. 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 can remove the valve sleeve from the cylinder when the valve sleeve fails, allowing technicians to quickly separate the cylinder and the valve sleeve, thereby simplifying the maintenance process. At the same time, by replacing the damaged valve sleeve separately instead of the entire pneumatic wrench, maintenance costs can be reduced, economic efficiency can be improved, the service life of the pneumatic wrench can be extended, and its safety and reliability can be improved.

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

[0007] A pneumatic wrench includes a housing, a cylinder, a valve sleeve, and a throttle core. The housing has an air inlet channel, the cylinder is disposed within the housing, the valve sleeve has a forward rotation air inlet and a reverse rotation air inlet communicating with the cylinder, and a main air inlet communicating with the air inlet channel. The throttle core is disposed within the valve sleeve and moves along the axis of the valve sleeve. The key feature is that the valve sleeve is detachably connected to the cylinder.

[0008] Furthermore, the outer side of the valve sleeve protrudes outward to form a connecting part one, and the cylinder is provided with a fixing seat. The outer side of the fixing seat protrudes outward to form a connecting part two, and the connecting part one is detachably connected to the connecting part two.

[0009] Furthermore, the first connecting part is provided with a threaded hole, and the second connecting part is provided with a threaded hole. Screws are threadedly connected in the first and second threaded holes.

[0010] Furthermore, the connecting part is provided with a countersunk groove, which is connected to the threaded hole, and the end of the screw is recessed into the countersunk groove.

[0011] Furthermore, the valve sleeve is provided with a groove located below the screw.

[0012] Furthermore, the outer side of the valve sleeve protrudes outward to form an edge portion, and the connecting portion is fixedly connected to the edge portion.

[0013] Furthermore, the valve sleeve is provided with a pad, the pad is provided with a through hole, the through hole is connected to the main air inlet, and at the same time the through hole is connected to the air inlet channel.

[0014] Furthermore, the outer casing includes a front casing and a rear casing, the rear casing including the housing and the handle, and the front casing being bolted to the housing.

[0015] Furthermore, a sealing element is provided between the front shell and the housing. The sealing element has a groove one, and the housing has a limiting protrusion one, which is embedded in the groove one. The sealing element has a groove two, and the front shell has a limiting protrusion two, which is embedded in the groove two.

[0016] Furthermore, it also includes a housing with a cavity, a handle located in the cavity, a cover plate with a groove three, and the rear end of the housing is embedded in the groove three.

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

[0018] When the valve sleeve malfunctions, it can be removed from the cylinder, allowing technicians to quickly separate the cylinder and valve sleeve, thus simplifying the maintenance process. At the same time, by replacing the damaged valve sleeve separately instead of the entire pneumatic wrench, maintenance costs can be reduced, improving economic efficiency, extending the service life of the pneumatic wrench, and enhancing its safety and reliability. 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 a pneumatic wrench according to the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the cylinder located inside the outer shell in this utility model;

[0022] Figure 3 This is a schematic diagram of the connection between the valve sleeve and the cylinder in this utility model;

[0023] Figure 4 This is a schematic diagram of the valve sleeve in this utility model;

[0024] Figure 5 for Figure 4 The main view;

[0025] Figure 6 for Figure 4 Top view;

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

[0027] Figure 8 This is a schematic diagram of the rear side of the sealing element in this utility model;

[0028] Figure 9 This is a schematic diagram of the front side of the sealing element in this utility model;

[0029] Figure 10 This is a schematic diagram of the rear shell structure in this utility model;

[0030] Figure 11 This is a schematic diagram of the shell structure in this utility model;

[0031] Figure 12 This is a schematic diagram of the front shell structure in this utility model;

[0032] Figure 13 This is a schematic diagram of the structure of this utility model without the housing installed.

[0033] In the diagram, 1-outer shell; 11-front shell; 111-connecting hole; 112-front shell hole; 113-limiting protrusion two; 12-shell; 121-limiting protrusion one; 122-cavity; 123-bore; 124-mounting hole; 13-handle; 14-seal; 141-slot one; 142-protrusion; 143-notch; 144-valve sleeve hole; 145-slot two;

[0034] 2-Cylinder; 21-Fixed seat; 22-Connecting part two; 23-Threaded hole two;

[0035] 3-Valve sleeve; 31-Reverse air inlet; 32-Forward air inlet; 33-Connecting part one; 34-Threaded hole one; 35-Counterhead groove; 36-Edge part; 37-Groove; 38-Padded block; 39-Main air inlet; 310-Through hole;

[0036] 4-Throttling core;

[0037] 5- Screws;

[0038] 6- Bolt; 61- Head;

[0039] 7-Shell; 71-Cover plate; 72-Limiting part; 73-Mounting groove; 74-Limiting hole; 75-Anti-slip texture. Detailed Implementation

[0040] like Figures 1 to 13 As shown, this utility model provides a pneumatic wrench, which includes a housing 1, a cylinder 2, a valve sleeve 3, and a throttling core 4.

[0041] The outer shell 1 includes a front shell 11 and a rear shell. The rear shell includes a housing 12 and a handle 13. The housing 12 and the handle 13 are integrally formed by injection molding, which can reduce quality defects of the rear shell. At the same time, the injection molding technology helps to reduce production costs by reducing production steps and shortening the production cycle, and can also design more complex rear shells.

[0042] The housing 12 has a boss 123 with a mounting hole 124. The front housing 11 has a connecting hole 111. A bolt 6 is installed in the mounting hole 124 and threaded into the connecting hole 111, allowing the front housing 11 to be detachably installed in the rear housing. This invention provides ample space for the bolt 6 by providing a boss 123 on the outer side of the housing 12. Furthermore, the boss 123 has specific dimensions, giving it good strength and increasing the load-bearing capacity of the bolt 6, while also increasing the overall strength of the housing 12.

[0043] A sealing element 14 is provided between the front shell 11 and the housing 12. The rear side of the sealing element 14 has a groove 141, and the housing 12 has a limiting protrusion 121 that is embedded in the groove 141. The front side of the sealing element 14 has a groove 145, and the front shell 11 has a limiting protrusion 113 that is embedded in the groove 145, increasing the airtightness of the front shell 11 and the housing 12. The sealing element 14 has a notch 143 through which the bolt 6 passes for easy installation. The sealing element 14 also has a protrusion 142 for easy and quick installation between the front shell 11 and the housing 12.

[0044] The handle 13 has an air intake channel. The cylinder 2 is located in the cavity 122 of the housing 12. The valve sleeve 3 has a forward rotation air intake hole 32 and a reverse rotation air intake hole 31 that communicate with the cylinder 2. The valve sleeve 3 passes through the valve sleeve hole 144 of the seal 14. The front housing 11 has a front housing hole 112. One end of the valve sleeve 3 is located in the front housing hole 112. The valve sleeve 3 has a main air intake hole 39 that communicates with the air intake channel. The throttle core 4 is located inside the valve sleeve 3 and moves along the axis of the valve sleeve 3. The forward and reverse rotation of the pneumatic wrench is existing technology, such as the utility model patent entitled "A New Type of Pneumatic Wrench" (authorization announcement number: CN206623026U). This utility model will not elaborate on the specific working principle of forward and reverse rotation.

[0045] The valve sleeve 3 and cylinder 2 of this utility model are detachably connected. Specifically, the outer side of the valve sleeve 3 protrudes outward to form a connecting part 33. The connecting part 33 is provided with a threaded hole 34. The cylinder 2 is provided with a fixing seat 21. The outer side of the fixing seat 21 protrudes outward to form a connecting part 22. The connecting part 22 is provided with a threaded hole 23. A screw 5 is threaded into the threaded hole 34 and the threaded hole 23, so that the connecting part 33 is detachably connected to the connecting part 22. When the screw 5 is unscrewed, the valve sleeve 3 can be removed from the cylinder 2, allowing technicians to quickly separate the cylinder 2 and the valve sleeve 3, thereby simplifying the maintenance process. At the same time, by replacing the damaged valve sleeve 3 separately instead of the entire pneumatic wrench, maintenance costs can be reduced, economic efficiency can be improved, the service life of the pneumatic wrench can be extended, and its safety and reliability can be improved.

[0046] The connecting part 33 is provided with a countersunk groove 35, which is connected to the threaded hole 34. The end of the screw 5 is recessed into the countersunk groove 35, so that the end of the screw 5 does not protrude, improving the aesthetics. At the same time, it can prevent accidental collision or scratching by objects or people, improving the safety of product use. Moreover, it can distribute the load when the end of the screw 5 is under force, reducing local stress concentration, thereby protecting the cover plate from damage. It can also reduce the risk of the screw 5 loosening, ensuring the stability and reliability of the connection between the valve sleeve 3 and the cylinder 2.

[0047] The valve sleeve 3 is provided with a groove 37, which is located below the screw 5. This provides a larger space for the valve sleeve 3 when the screw 5 is screwed in. When the screw 5 is installed, it prevents the screw 5 from scratching the outside of the valve sleeve 3. At the same time, it makes it easier for the screw 5 to be screwed into the threaded hole 34 and the threaded hole 23 vertically from top to bottom, ensuring the effective connection between the connecting part 33 and the connecting part 22.

[0048] The outer side of the valve sleeve 3 protrudes outward, forming an edge portion 36. The connecting portion 33 and the edge portion 36 are integrally formed, which fixes the connecting portion 33 and the edge portion 36 together, providing good strength. At the same time, it leaves a large space between the connecting portion 33 and the outer side of the valve sleeve 3, which facilitates the installation of screws 5 with a designed diameter, meeting the installation requirements of the valve sleeve 3 and the cylinder 2.

[0049] The valve sleeve 3 is provided with a pad 38, and the pad 38 is provided with a through hole 310, which is connected to the main air inlet 39 and also connected to the air intake channel. The pad 38 is made of an elastic material, such as a rubber pad, to increase the airtightness between the valve sleeve 3 and the handle 13.

[0050] This utility model adds a housing 7 with a cavity. The handle 13 is located in the cavity, so that the housing 7 covers the handle 13, protecting it and increasing the service life of the pneumatic wrench. The housing 7 is manufactured separately, and its surface has anti-slip textures, giving the handle 13 an anti-slip function.

[0051] The housing 7 is equipped with a cover plate 71. The housing 7 and the cover plate 71 are integrally molded by injection molding, giving them good strength. The cover plate 71 has a groove into which the rear end of the housing 12 is embedded. The cover plate 71 supports the housing 12, increases its strength, and meets the requirements for the rotation of the knob in the rear housing. The cover plate 71 has a limiting hole 74 and a mounting groove 73. The threaded rod of the bolt 6 passes through the limiting hole 74, and the head 61 of the bolt 6 is recessed into the mounting groove 73, preventing the head 61 of the bolt 6 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 head 61 of the bolt 6 to distribute the load when under force, reducing local stress concentration, thereby protecting the cover plate 71 from damage and reducing the risk of the bolt 6 loosening, ensuring the stability and reliability of the connection between the front housing 11 and the rear housing. The cover plate 71 is provided with a limiting part 72, and the limiting part 72 is provided with a limiting groove. The boss 123 is embedded in the limiting groove, so that the cover plate 71 is positioned on the housing 12, which facilitates the quick installation of the bolt 6 and improves the overall strength of the rear housing. In this utility model, the housing 7 is manufactured separately, and the surface of the housing 7 is formed with anti-slip texture 75, so that the handle has an anti-slip function.

[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: An outer casing, wherein the outer casing is provided with an air intake channel; A cylinder, wherein the cylinder is disposed within the housing; A valve sleeve, the valve sleeve having a forward rotation air inlet and a reverse rotation air inlet communicating with the cylinder, and the valve sleeve having a main air inlet communicating with the air inlet channel; A throttling core is disposed inside the valve sleeve, and the throttling core moves along the axial direction of the valve sleeve; Its features are: The valve sleeve is detachably connected to the cylinder.

2. A pneumatic wrench according to claim 1, characterized in that: The outer side of the valve sleeve protrudes outward to form a connecting part one. The cylinder is provided with a fixed seat, and the outer side of the fixed seat protrudes outward to form a connecting part two. The connecting part one is detachably connected to the connecting part two.

3. A pneumatic wrench according to claim 2, characterized in that: The first connecting part is provided with a threaded hole, and the second connecting part is provided with a threaded hole. Screws are threadedly connected to the first threaded hole and the second threaded hole.

4. A pneumatic wrench according to claim 3, characterized in that: The connecting part is provided with a countersunk groove, which is connected to the threaded hole, and the end of the screw is recessed into the countersunk groove.

5. A pneumatic wrench according to claim 3, characterized in that: The valve sleeve has a groove located below the screw.

6. A pneumatic wrench according to claim 3, characterized in that: The outer side of the valve sleeve protrudes outward to form an edge portion, and the connecting portion is fixedly connected to the edge portion.

7. A pneumatic wrench according to claim 1, characterized in that: The valve sleeve is provided with a pad, the pad is provided with a through hole, the through hole is connected to the main air inlet, and the through hole is also connected to the air inlet channel.

8. A pneumatic wrench according to claim 1, characterized in that: The outer casing includes a front casing and a rear casing, the rear casing includes a housing and a handle, and the front casing is bolted to the housing.

9. A pneumatic wrench according to claim 8, characterized in that: A sealing element is provided between the front shell and the housing. The sealing element has a first groove. The housing has a first limiting protrusion. The first limiting protrusion is embedded in the first groove. The sealing element has a second groove. The front shell has a second limiting protrusion. The second limiting protrusion is embedded in the second groove.

10. A pneumatic wrench according to claim 8, characterized in that: It also includes a housing with a cavity, the handle being disposed in the cavity, the housing having a cover plate with a groove three, and the rear end of the housing being embedded in the groove three.

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