A pneumatic tool

Abstract

The technical scheme belongs to the technical field of pneumatic tools and specifically relates to a pneumatic tool, which comprises a front end cover and a cylinder arranged on the front end cover, the front end cover has a mounting cavity for accommodating the cylinder, further comprises a front baffle, the front baffle is arranged in the mounting cavity, and the two sides of the front baffle are respectively abutted against the opposite side walls of the cylinder and the mounting cavity. The front baffle is abutted against on both sides, which provides stable axial support for the cylinder, serves as a barrier, and transfers the main friction contact surface of the rotor rotating during the working of the cylinder to the front baffle. The front baffle is made of a material with excellent wear resistance, which slows down the wear process caused by high-speed rotation and friction of the blade, protects the front end cover body from wear, prolongs the service life of the front end cover body, keeps the tightness of the contact interface between the front end cover and the cylinder for a long time, and thus ensures the air tightness stability of the key part of the pneumatic system.

Description

Technical Field

[0001] This technical solution relates to the field of pneumatic tool technology, and specifically refers to a pneumatic tool. Background Technology

[0002] Pneumatic tools are power devices that use compressed air as a power source. Their core is to use an air compressor to generate high-pressure gas, which is then delivered to the tool through pipelines. This drives an internal pneumatic motor to convert air pressure energy into mechanical energy, thereby generating rotational or reciprocating impact motion. They are widely used in fastening, grinding, and cutting operations.

[0003] For example, Chinese patent CN217380656U discloses a pneumatic motor for a pneumatic wrench, including a stator housing, a first cover, and a second cover. The first cover has a forward-rotating air inlet and a reverse-rotating air inlet for air to enter. The stator housing has an air outlet for air to leave. The stator housing has at least an outer shell, a rotor, and blades. When the pneumatic motor needs to rotate forward, when the gas enters the stator housing from the forward-rotating air inlet, part of it flows along the first air outlet of the outer shell to the first air outlet at the other end of the rotor, and the other part flows clockwise along the direction of the first guide groove of the outer shell. Both parts of the airflow impact the blades clockwise, causing the rotor to rotate clockwise. Finally, the gas flows to the air outlet of the outer shell and is discharged from the pneumatic motor.

[0004] The aforementioned pneumatic motor is installed inside the pneumatic wrench and also needs to be fitted with a front cover. The current front cover is designed to meet the requirements of lightweight and one-piece molding process, but in actual use, its key friction parts are not wear-resistant enough. As it rotates with the rotor, it will make frictional contact with the front cover of the housing. Long-term operation will easily lead to wear of the front cover, resulting in a reduction in its service life. At the same time, after wear, it will also affect the airtightness of the pneumatic system, resulting in a reduction in the performance of the pneumatic wrench or even making it unusable. Utility Model Content

[0005] This technical solution aims to improve the existing front cover's poor wear resistance, which leads to short service life and affects the airtightness of the pneumatic system under long-term wear, by providing a pneumatic tool.

[0006] The purpose of this technical solution is achieved as follows: A pneumatic tool includes a front end cap and a cylinder disposed on the front end cap. The front end cap has a mounting cavity for receiving the cylinder and also includes a front baffle plate installed in the mounting cavity, with its two sides abutting against the opposite sidewalls of the cylinder and the mounting cavity, respectively.

[0007] Through the above technical solution, when a pneumatic tool is in normal use, the front baffle adopts double-sided contact to provide stable axial support for the cylinder. As a barrier, it transfers the main friction contact surface of the rotor rotation during cylinder operation to the front baffle. The front baffle is made of a material with excellent wear resistance to slow down the wear process caused by the high-speed rotation friction of the blades, so as to protect the front cover body from wear, extend its service life, and maintain the tightness of the contact interface between the front cover and the cylinder for a long time, thereby ensuring the airtightness stability of key parts of the pneumatic system.

[0008] Preferably, the front baffle is formed with an annular groove along the inner wall of the periphery of the mounting cavity bottom, and the edge of the front baffle is embedded in the annular groove.

[0009] Through the above technical solution, the front cover is formed with an annular groove during die casting. The front cover is embedded with a punched front baffle through the annular groove to achieve radial constraint and enhance the connection rigidity between components.

[0010] Preferably, the front baffle has a snap-fit ​​protrusion, and the front end cover has a snap-fit ​​groove that matches the snap-fit ​​protrusion.

[0011] With the above technical solution, when the front baffle is installed in the mounting cavity, the snap-fit ​​protrusion is embedded in the snap-fit ​​groove to limit the relative rotation between the front baffle and the front end cover, prevent abnormal wear caused by relative rotation, and improve stability.

[0012] Preferably, the inner side of the snap-fit ​​protrusion has a limiting groove one, and the cylinder has a limiting groove two that corresponds to the limiting groove one. After the limiting groove one and the limiting groove two on both sides are aligned and spliced, a limiting shaft is installed.

[0013] With the above technical solution, when the cylinder and the front baffle are assembled and abutted, the limiting grooves on both sides are precisely aligned and spliced ​​together to form a complete shaft hole. The limiting shaft is installed in the shaft hole. Based on the fixed position of the cylinder housing, the relative rotation between the front baffle and the cylinder housing is limited to avoid the rotation of the rotor driving the front baffle, and further prevent abnormal wear caused by relative rotation.

[0014] Preferably, the front baffle has a shaft hole for the output shaft of the cylinder to pass through.

[0015] Through the above technical solution, the cylinder's output shaft can pass through the shaft hole, ensuring that the output shaft can rotate freely and smoothly.

[0016] Preferably, the front baffle is made of carbon steel, stainless steel, or bearing steel.

[0017] Through the above technical solution, the front bumper is made of high-strength and high-wear-resistance materials such as carbon steel.

[0018] Preferably, the front cover is made of aluminum alloy, magnesium alloy, or titanium alloy.

[0019] Through the above technical solution, the material of the front cover is preferably a lightweight material such as aluminum alloy, which achieves weight reduction and can withstand higher working pressure and impact load.

[0020] The key and beneficial technical effects of this technical solution compared to existing technologies are: 1. This technical solution involves setting a matching front baffle inside the mounting cavity, with its two sides abutting against the cylinder and the side wall of the mounting cavity respectively. This transfers the friction generated by the rotor rotation to the front baffle, reduces the wear of the front cover, extends the overall service life, and ensures the airtight stability of the cylinder contact interface, thereby ensuring the reliable operation of the pneumatic system.

[0021] 2. In this technical solution, the front end cover is formed with an annular groove during die casting. The front end cover is embedded with a punched front baffle through the annular groove to achieve radial constraint and enhance the connection rigidity between components.

[0022] 3. This technical solution uses carbon steel or similar materials for the front baffle, which has high strength and high wear resistance, further reducing the impact of wear. The front cover is preferably made of aluminum alloy or similar materials, achieving lightweighting and weight reduction, and is able to withstand higher working pressure and impact loads. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 This is a partial structural diagram of the front cover and cylinder in the embodiment; Figure 3 This embodiment Figure 2 Schematic diagram of a partial explosion; Figure 4 This embodiment Figure 3 Another perspective illustration; Figure 5 This is a partial sectional view of this embodiment; Figure 6 For the example Figure 5 A magnified view of part A.

[0024] Reference numerals: 1. Front end cover; 2. Cylinder; 3. Mounting cavity; 4. Front baffle; 5. Annular groove; 61. Snap-fit ​​protrusion; 62. Snap-fit ​​groove; 71. Limiting groove one; 72. Limiting groove two; 8. Limiting shaft; 9. Shaft hole. Detailed Implementation

[0025] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0026] Example: See Figures 1-4A pneumatic tool includes a front cover 1 and a cylinder 2. The front cover 1 is made of aluminum alloy, magnesium alloy, or titanium alloy, which have lightweight and impact-resistant properties. In this embodiment, aluminum alloy is preferred. The front cover 1 has a mounting cavity 3, and the cylinder 2 is installed in the mounting cavity 3. The specific structure of the cylinder 2 can be found in Chinese Patent CN217380656U, which includes a housing and a rotor rotatably disposed in the housing, as well as a front baffle 4. The front baffle 4 is made of carbon steel, stainless steel, or bearing steel, which have high strength and high wear resistance. The front baffle 4 is installed in the mounting cavity 3. The specific installation method between the front cover 1 and the front cover 1 is that the front cover 1 is embedded with the punched front baffle 4 during aluminum die casting, so that the front cover 1 has an annular groove 5 corresponding to the front baffle 4. The edge of the front cover 1 is fitted into the annular groove 5 to prevent the front cover 1 from axially disengaging from the mounting cavity 3.

[0027] Meanwhile, the front baffle 4 is formed with a protruding snap-fit ​​protrusion 61, which is cylindrical in shape. During the aluminum die-casting process, the front cover 1 is formed with a matching snap-fit ​​groove 62 corresponding to the snap-fit ​​protrusion 61. The snap-fit ​​protrusion 61 is embedded and fitted in the snap-fit ​​groove 62 to restrict the circumferential rotation of the front baffle 4 and improve stability.

[0028] See Figure 5 and Figure 6 The cylinder 2 is installed on the side of the front baffle 4 away from the bottom of the mounting cavity 3. The cylinder 2 abuts against one side of the front baffle 4, and the other side of the front baffle 4 abuts against the corresponding end face of the mounting cavity 3. The front baffle 4 has a shaft hole 9 for the output shaft of the cylinder 2 to pass through. The front baffle 4 can completely block the airflow area abutting against the inside of the cylinder 2, reduce the assembly gap at the edge, reduce the possibility of leakage, and improve airtightness.

[0029] The inner side of the snap-fit ​​protrusion 61 has a corresponding limiting groove 71. The outer shell of the cylinder 2 has a limiting groove 72 corresponding to the limiting groove 71. The limiting groove 72 and the limiting groove 71 are aligned and spliced ​​together to form a whole space. The limiting groove 72 and the limiting groove 71 are simultaneously installed with a limiting shaft 8 to limit the relative rotation between the cylinder 2 and the front baffle 4, so as to prevent the rotor of the cylinder 2 from driving the front baffle 4 to rotate, thereby improving the installation stability.

[0030] The specific work process of this plan is as follows: This technical solution involves a front baffle 4 that abuts against both sides during normal use of a pneumatic tool, providing stable axial support for the cylinder 2. As a barrier, it transfers the main friction contact surface of the rotor rotation during cylinder 2 operation to the front baffle 4. The front baffle 4 is made of a material with excellent wear resistance, which slows down the wear process caused by the high-speed rotation friction of the blades, thus protecting the front cover 1 from wear, extending its service life, and maintaining the tightness of the contact interface between the front cover 1 and the cylinder 2 for a long time, thereby ensuring the airtightness of key parts of the pneumatic system.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A pneumatic tool, comprising a front end cap (1) and a cylinder (2) disposed on the front end cap (1), the front end cap (1) having a mounting cavity (3) for receiving the cylinder (2), characterized in that: It also includes a front baffle (4), which is installed in the mounting cavity (3) with its two sides abutting against the opposite sidewalls of the cylinder (2) and the mounting cavity (3).

2. A pneumatic tool according to claim 1, characterized in that: The front baffle (4) has an annular groove (5) formed on the inner wall of the periphery of the bottom of the mounting cavity (3), and the edge of the front baffle (4) is embedded in the annular groove (5).

3. A pneumatic tool according to claim 1, characterized in that: The front baffle (4) has a snap-fit ​​protrusion (61), and the front end cover (1) is formed with a snap-fit ​​groove (62) that matches the snap-fit ​​protrusion (61).

4. A pneumatic tool according to claim 3, characterized in that: The inner side of the snap-fit ​​protrusion (61) has a limiting groove 1 (71), and the cylinder (2) has a limiting groove 2 (72) corresponding to the limiting groove 1 (71). After the limiting groove 1 (71) and the limiting groove 2 (72) on both sides are aligned and spliced, a limiting shaft (8) is installed.

5. A pneumatic tool according to claim 1, characterized in that: The front baffle (4) has a shaft hole (9) through which the output shaft of the cylinder (2) passes.

6. A pneumatic tool according to claim 1, characterized in that: The front baffle (4) is made of carbon steel, stainless steel or bearing steel.

7. A pneumatic tool according to claim 1, characterized in that: The front cover (1) is made of aluminum alloy, magnesium alloy or titanium alloy.

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