Pneumatic grinding machine

Abstract

The utility model provides a pneumatic grinding machine with a valve element easy to replace. According to the technical scheme, the device comprises a shell and a pneumatic rotor arranged in the shell, a handle is arranged at the lower end of the shell, a valve switch is arranged at the upper end of the handle, an air pipe connector is arranged at the tail of the handle, and an air inlet channel and an air outlet channel which are communicated with the shell are arranged in the handle. The valve switch comprises a valve body, a valve rod, a trigger, an air valve nut and an air inlet valve element, the valve body is arranged in the handle, the valve rod is telescopically arranged in the valve body, and the trigger is hinged to the handle.

Description

Technical Field

[0001] The utility model belongs to the field of pneumatics, and in particular relates to a pneumatic grinding machine. Background Art

[0002] A pneumatic grinder is a grinding tool that uses compressed air as a power source. It is mainly composed of a housing, a pneumatic rotor, a handle, an air circuit, etc. A valve switch is provided on the housing to control the opening or closing of the air circuit. The traditional valve switch structure is shown in the Chinese utility model patent with the authorization announcement number "CN2587588Y" and the name "Pneumatic Grinder". It includes a valve body and a valve stem disposed in the valve body, and the valve stem head is integrally formed with a valve core. The disadvantage is that since the valve core and the sealing ring on the valve core are wearing parts, the traditional valve core and sealing ring are inconvenient and need to be replaced together with the valve stem, which is costly. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pneumatic grinding machine which is easy to replace the valve core.

[0004] To solve the above problems, the technical solution adopted by the utility model includes: a shell and a pneumatic rotor arranged in the shell, a handle is provided at the lower end of the shell, a valve switch is provided at the upper end of the handle, and an air pipe joint is provided at the tail, and an air inlet channel and an air outlet channel connected to the shell are provided in the handle, characterized in that: the valve switch includes a valve body, a valve stem, a trigger, an air valve nut and an air inlet valve core, the valve body is arranged in the handle, the valve stem is telescopically arranged in the valve body, the trigger is hinged to the handle, the air inlet valve core is arranged at the air inlet port of the valve body, the air valve nut is connected to the handle, a reset spring is provided between the air inlet valve core and the air valve nut, and a first sealing ring is provided on the air inlet valve core.

[0005] The pneumatic grinding machine is characterized in that a second sealing ring is provided on the air valve nut.

[0006] The pneumatic grinder is characterized in that a muffler nut is provided on the air outlet channel of the handle, and a muffler is connected through the muffler nut. The muffler includes a cylindrical sleeve and a set screw, and the side wall of the cylindrical sleeve is provided with a group of inclined exhaust ports.

[0007] The pneumatic grinder is characterized in that the air inlet passage of the handle is connected to the air pipe joint via an air inlet nut, and a regulating valve is provided on the air inlet nut.

[0008] The pneumatic grinding machine described above is characterized in that: the regulating valve includes a regulating valve rod penetrating through the air inlet nut, an adjusting nut integrally formed at the end of the regulating valve rod, and third sealing rings provided at both ends of the regulating valve rod. The front end of the regulating valve rod extends out of the air inlet nut and is fixed by a first circlip.

[0009] The pneumatic grinding machine described above is characterized in that: a balance body is provided on the output shaft of the pneumatic rotor. A bearing and a rotating shaft are provided inside the balance body and are fixed by a second circlip.

[0010] The pneumatic grinding machine described above is characterized in that: a fourth sealing ring for sealing cooperation with the air inlet nut is provided on the air pipe joint.

[0011] The beneficial effect of the pneumatic grinding machine of the present utility model: By unscrewing the air valve nut, the air inlet valve core can be replaced separately, making disassembly and assembly more convenient.

[0012] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the pneumatic grinding machine of the present utility model;

[0014] Figure 2 is a cross-sectional view of the pneumatic grinding machine of the present utility model;

[0015] Figure 3 is a structural schematic diagram between the air inlet nut, the regulating valve and the air pipe joint of the present utility model;

[0016] Figure 4 is an exploded view of the valve switch of the present utility model;

[0017] Figure 5 is a structural schematic diagram of the balance body of the present utility model. Specific Embodiments

[0018] Such as Figures 1 to 5As shown in the figure, the right-angle pneumatic engraving and grinding machine of the present utility model, the pneumatic grinding machine, includes a housing 1 and a pneumatic rotor 2 provided in the housing 1. A handle 3 is provided at the lower end of the housing 1. A valve switch 4 is provided at the upper end of the handle 3. An air pipe joint 5 is provided at the tail of the handle 3. An air inlet passage 6 and an air outlet passage 7 communicating with the housing 1 are provided in the handle 3. The valve switch 4 includes a valve body 8, a valve rod 9, a trigger 10, an air valve nut 11 and an air inlet valve core 12. The valve body 8 is provided in the handle 3. The valve rod 9 is telescopically arranged in the valve body 8. The trigger 10 is hinged to the handle 3, and the telescopic movement of the valve rod 9 is controlled by pressing the trigger 10. The air inlet valve core 12 is provided at the air inlet 13 of the valve body 8. When the valve rod 9 is pressed, the air inlet valve core 12 is pushed open, so that gas enters from the air inlet 13. The air valve nut 11 is connected to the handle 3. A return spring 14 is provided between the air inlet valve core 12 and the air valve nut 11. A first sealing ring 15 is provided on the air inlet valve core 12.

[0019] Preferably, a second sealing ring 16 is provided on the air valve nut 11. The second sealing ring 16 is in sealing cooperation with the handle 3.

[0020] Preferably, a silencer nut 17 is provided on the air outlet passage 7 of the handle 3. A silencer 18 is connected through the silencer nut 17. The silencer 18 includes a cylindrical sleeve body 19 made of plastic and a set screw 20. The cylindrical sleeve body 19 is fixed to the silencer nut 17 through the set screw 20. A group of inclined exhaust ports 21 are provided on the side wall of the cylindrical sleeve body 19. After the high-speed gas comes out and circulates through the inner cavity of the cylindrical sleeve body 19, it is then discharged through the wider exhaust ports 21, so as to reduce noise.

[0021] Preferably, the air pipe joint 5 is connected to the air inlet passage 6 of the handle 3 through an air inlet nut 22. A regulating valve 23 is provided on the air inlet nut 22. The regulating valve 23 includes a regulating valve rod 24 penetrating through the air inlet nut 22, an adjusting nut 25 integrally formed at the end of the regulating valve rod 24, and third sealing rings 26 provided at both ends of the regulating valve rod 24. The front end of the regulating valve rod 24 extends out of the air inlet nut 22 and is fixed by a first snap ring 27. By rotating the adjusting nut 25 to rotate the regulating valve rod 2, the opening degree of the adjusting port on the regulating valve rod 2 is changed to realize the adjustment of the air inlet size.

[0022] Preferably, a balance body 28 is provided on the output shaft of the pneumatic rotor 2. A bearing 29 and a rotating shaft 30 are provided in the balance body 28 and are fixed by a second snap ring 31. The rotating shaft 30 is used to connect the grinding head. By fixing the bearing 29 and the rotating shaft 30 through the balance body 28, the grinding head is more stable when rotating.

[0023] Preferably, a fourth sealing ring 32 that is hermetically engaged with the intake nut 22 is provided on the tracheal joint 5 to improve the sealing performance of the connection.

[0024] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention are all included within the protection scope of the present invention.

Claims

1. A pneumatic grinding machine, comprising a housing (1) and a pneumatic rotor (2) provided in the housing (1). A handle (3) is provided at the lower end of the housing (1). A valve switch (4) is provided at the upper end of the handle (3), and an air pipe joint (5) is provided at the tail. An air inlet passage (6) and an air outlet passage (7) that communicate with the housing (1) are provided in the handle (3), and it is characterized in that: The valve switch (4) includes a valve body (8), a valve stem (9), a trigger (10), an air valve nut (11) and an intake valve core (12). The valve body (8) is arranged inside the handle (3). The valve stem (9) is telescopically arranged inside the valve body (8). The trigger (10) is hinged to the handle (3). The intake valve core (12) is arranged at the intake port (13) of the valve body (8). The air valve nut (11) is connected to the handle (3). A return spring (14) is arranged between the intake valve core (12) and the air valve nut (11). A first sealing ring (15) is arranged on the intake valve core (12).

2. The pneumatic grinding machine according to claim 1, characterized in that: A second sealing ring (16) is arranged on the air valve nut (11).

3. The pneumatic grinding machine according to claim 1, wherein: A silencer nut (17) is arranged on the air outlet channel (7) of the handle (3). A silencer (18) is connected through the silencer nut (17). The silencer (18) includes a cylindrical sleeve body (19) and a set screw (20). A group of inclined exhaust ports (21) are arranged on the side wall of the cylindrical sleeve body (19).

4. The pneumatic grinding machine according to claim 1, wherein: The air inlet channel (6) of the handle (3) is connected to the air pipe joint (5) through an air inlet nut (22). A regulating valve (23) is arranged on the air inlet nut (22).

5. The pneumatic grinding machine according to claim 4, wherein: The regulating valve (23) includes a regulating valve stem (24) penetrating through the air inlet nut (22), an adjusting nut (25) integrally formed at the end of the regulating valve stem (24), and third sealing rings (26) arranged at both ends of the regulating valve stem (24). The front end of the regulating valve stem (24) extends out of the air inlet nut (22) and is fixed by a first circlip (27).

6. The pneumatic grinding machine according to claim 1, wherein: A balance body (28) is arranged on the output shaft of the pneumatic rotor (2). A bearing (29) and a rotating shaft (30) are arranged inside the balance body (28) and are fixed by a second circlip (31).

7. The pneumatic grinding machine according to claim 4, characterized in that: A fourth sealing ring (32) which is in sealing cooperation with the air inlet nut (22) is arranged on the air pipe joint (5).

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