Air intake adjusting structure on a pneumatic dry grinder

Abstract

The application relates to an air inlet adjusting structure of a pneumatic dry grinder, which comprises a casing provided with an air inlet channel, an adjusting knob rotatably arranged on the upper portion of the casing, an upper pressing cover arranged on the casing and used for limiting the axial position of the adjusting knob, an opening and closing rod axially slidably penetrating through the middle portion of the adjusting knob, an opening and closing pin arranged in the air inlet channel and linked with the opening and closing rod, a sealing gasket arranged in the air inlet channel and used for realizing air path on-off control by acting on the opening and closing pin, and a movable trigger rotatably arranged on the casing, wherein the upper end of the opening and closing rod penetrates through the upper pressing cover and abuts against the movable trigger, the adjusting knob can be rotated to align or misalign the adjusting hole with the air inlet hole at the front end of the air inlet channel, when the adjusting hole is aligned with the air inlet hole, the movable trigger is pressed to make the opening and closing rod descend, the opening and closing rod drives the opening and closing pin to move away from the sealing gasket, and the internal air path is guided to be conducted; the adjusting knob and the movable trigger are arranged on the same side of the casing, and the actual use is more convenient.

Description

Technical Field

[0001] This utility model relates to an air intake adjustment structure for a pneumatic dry grinding mill. Background Technology

[0002] The pneumatic dry grinder uses compressed air as a power source to drive the pneumatic motor to rotate at high speed. When the grinding pad installed at the output end of the pneumatic motor comes into contact with the surface of the object to be ground, the polishing operation can be achieved.

[0003] Figure 1 The diagram shows a cross-sectional view of an existing pneumatic dry grinder. In this structure, the adjusting knob 4 and the opening / closing lever 6 are positioned on the upper and lower sides of the air intake channel 11. The opening / closing lever 6 controls the airflow of the air intake channel 11 by interlocking with the opening / closing pin 2 installed in the air intake channel. The adjusting knob 4 is mounted on the housing 1 via a cylindrical pin 60 and can rotate. By rotating, the adjusting hole 41 on the adjusting knob 4 can be aligned with or offset from the air intake hole 111 at the front end of the air intake channel 11. In other words, the adjusting knob 4 is used as the main switch for the airflow. Because the adjusting knob 4 and the opening / closing lever 6 are not on the same side, it is inconvenient to operate with one hand. Summary of the Invention

[0004] To address the shortcomings mentioned above, this utility model provides an air intake adjustment structure for a pneumatic dry grinding mill.

[0005] To achieve the above objectives, this utility model provides an air intake adjustment structure for a pneumatic dry grinder, including a housing with an air intake channel, an adjustment knob rotatably mounted on the upper part of the housing, an upper pressure cover mounted on the housing to limit the axial position of the adjustment knob, an opening / closing rod axially sliding through the middle of the adjustment knob, an opening / closing pin placed in the air intake channel and linked with the opening / closing rod, and a sealing gasket placed in the air intake channel and interacting with the opening / closing pin to control the air passage opening / closing. The housing also has a rotatable movable trigger. The upper end of the opening / closing rod extends through the upper pressure cover and abuts against the movable trigger. By rotating the adjustment knob, its adjustment hole can be aligned with or offset from the air intake hole at the front end of the air intake channel. When the adjustment hole is aligned with the air intake hole, pressing the movable trigger causes the opening / closing rod to move downwards. The opening / closing rod drives the opening / closing pin to move away from the sealing gasket, thus opening the internal air passage.

[0006] Furthermore, the upper pressure cover is fixed to the housing by a cross-grooved pan head self-tapping screw.

[0007] Furthermore, the adjustment knob is provided with a first sealing ring, and the opening and closing rod is provided with a second sealing ring.

[0008] Furthermore, the top of the opening / closing lever has a ball-head structure.

[0009] Furthermore, the opening / closing rod and the opening / closing pin are linked together by an inclined plane structure.

[0010] Furthermore, a pneumatic motor is also provided inside the housing. A pivot shaft is mounted on the output shaft of the pneumatic motor via a bearing. A grinding pad is mounted on the pivot shaft. The eccentricity between the pivot shaft and the output shaft is 2.5 mm.

[0011] The advantages of this utility model over the prior art are as follows:

[0012] The adjustment knob and the movable trigger are located on the same side of the upper part of the housing, allowing the user to operate them with one hand, making them more convenient to use. Attached Figure Description

[0013] Figure 1 A cross-sectional view of an existing pneumatic dry grinding mill;

[0014] Figure 2 This is a cross-sectional view of the air intake adjustment structure on a pneumatic dry mill.

[0015] In the diagram: 1. Housing; 11. Air intake channel; 111. Air intake hole; 2. Opening / closing pin; 3. Sealing gasket; 4. Adjusting knob; 41. Adjusting hole; 5. Sealing ring one; 6. Opening / closing rod; 7. Sealing ring two; 8. Upper pressure cover; 9. Movable trigger; 10. Cross-shaped pan head self-tapping screw; 20. Pneumatic motor; 201. Output shaft; 30. Bearing; 40. Pivot shaft; 50. Grinding pad; 60. Cylindrical pin. Detailed Implementation

[0016] like Figure 2As shown in the figure, an air intake adjustment structure for a pneumatic dry grinder according to an embodiment of the present invention includes a housing 1 with an air intake channel 11, an adjustment knob 4 rotatably mounted on the upper part of the housing 1, an upper pressure cover 8 mounted on the housing 1 to limit the axial position of the adjustment knob 4, an opening and closing rod 6 axially sliding through the middle of the adjustment knob 4, an opening and closing pin 2 placed in the air intake channel 11 and linked with the opening and closing rod 6, and a sealing gasket 3 placed in the air intake channel 11 and interacting with the opening and closing pin 2 to control the air passage opening and closing. The housing 1 is also provided with a rotatable movable trigger 9. The upper end of the opening and closing rod 6 extends through the upper pressure cover 8 and abuts against the movable trigger 9. The adjustment knob 4 can be rotated to align its adjustment hole 41 with the air intake hole 111 at the front end of the air intake channel 11. With the adjusting hole 41 aligned with the air inlet 111, pressing the trigger 9 causes the opening / closing lever 6 to move downwards. The opening / closing lever 6 drives the opening / closing pin 2 to move away from the sealing gasket 3, thus opening the internal air passage. The upper pressure cover 8 is fixed to the housing 1 by a cross-shaped self-tapping screw 10. The adjusting knob 4 is equipped with a sealing ring 5, and the opening / closing lever 6 is equipped with a sealing ring 7. The top of the opening / closing lever 6 has a ball head structure. The opening / closing lever 6 and the opening / closing pin 2 are linked by a bevel structure. A pneumatic motor 20 is also installed inside the housing 1. A pivot shaft 40 is configured on the output shaft 201 of the pneumatic motor 20 via a bearing 30. A grinding pad 50 is configured on the pivot shaft 40. The eccentricity between the pivot shaft 40 and the output shaft 201 is 2.5 mm.

[0017] The adjustment knob and the movable trigger are located on the same side of the upper part of the housing, allowing the user to operate them with one hand, making them more convenient to use.

[0018] In practical use, for ease of understanding of this utility model, it will be described in conjunction with the accompanying drawings;

[0019] See Figure 2 At this time, the adjusting hole 41 is aligned with the air inlet hole 111, and the adjusting knob 4, which serves as the main switch for the air circuit, is in the open state. Pressing down the movable trigger 9 causes the opening and closing lever 6 to move downward. The opening and closing lever 6 drives the opening and closing pin 2 to move away from the sealing gasket 3, that is, the opening and closing pin 2 moves to the right. The opening and closing pin 2 is no longer in close contact with the sealing gasket 3, and the size of the opening and closing pin 2 is slightly smaller than the air inlet channel 11. The airflow flows through the gap between the opening and closing pin 2 and the air inlet channel 11 to the pneumatic motor 20, causing the pneumatic motor 20 to work.

[0020] When the adjustment knob 4 is rotated to set the angle so that the adjustment hole 41 is misaligned with the air inlet 111, the adjustment knob 4, which serves as the main switch for the air circuit, is in the closed state. At this time, pressing the movable trigger 9 will not start the pneumatic motor 20.

[0021] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An air intake regulating structure for a pneumatic dry grinding mill, characterized in that: The device includes a housing (1) with an air intake channel (11), an adjustment knob (4) rotatably located on the upper part of the housing (1), an upper pressure cover (8) on the housing (1) for limiting the axial position of the adjustment knob (4), an opening and closing rod (6) axially sliding through the middle of the adjustment knob (4), an opening and closing pin (2) placed in the air intake channel (11) and linked with the opening and closing rod (6), and a sealing gasket (3) placed in the air intake channel (11) and interacting with the opening and closing pin (2) to control the air passage opening and closing. The housing (1) is also provided with A rotatable trigger (9) is provided. The upper end of the opening and closing lever (6) extends through the upper pressure cover (8) and abuts against the rotatable trigger (9). The adjustment knob (4) can be rotated to align or offset its adjustment hole (41) with the air inlet hole (111) at the front end of the air inlet channel (11). When the adjustment hole (41) is aligned with the air inlet hole (111), pressing the rotatable trigger (9) causes the opening and closing lever (6) to move downward. The opening and closing lever (6) drives the opening and closing pin (2) to move away from the sealing gasket (3), thereby opening the internal air passage.

2. The air intake adjustment structure for a pneumatic dry mill according to claim 1, characterized in that: The upper pressure cover (8) is fixed to the housing (1) by a cross-shaped pan head self-tapping screw (10).

3. The air intake adjustment structure for a pneumatic dry grinding mill according to claim 1, characterized in that: The adjustment knob (4) is provided with a sealing ring one (5), and the opening and closing rod (6) is provided with a sealing ring two (7).

4. The air intake adjustment structure for a pneumatic dry grinding mill according to claim 3, characterized in that: The top of the opening / closing lever (6) is a ball head structure.

5. The air intake adjustment structure for a pneumatic dry grinding mill according to claim 4, characterized in that: The opening / closing rod (6) and the opening / closing pin (2) are linked by an inclined plane structure.

6. The air intake adjustment structure for a pneumatic dry grinding mill according to claim 5, characterized in that: The housing (1) is also provided with a pneumatic motor (20). A pivot shaft (40) is arranged on the output shaft (201) of the pneumatic motor (20) via a bearing (30). A grinding pad (50) is arranged on the pivot shaft (40). The eccentricity between the pivot shaft (40) and the output shaft (201) is 2.5 mm.

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