Pneumatic actuating mechanism with zero grease leakage under all working conditions

Abstract

The utility model belongs to the technical field of pneumatic actuating mechanisms, and particularly relates to a pneumatic actuating mechanism with zero grease leakage under all working conditions. A groove A is formed in the end of the cylinder cover in the circumferential direction, a sealing ring A is placed in the groove A and makes contact with the inner side wall of the cylinder body, a sealing spigot A is formed in the side face, making contact with the end of the cylinder body, of the end of the cylinder cover, and a round oil seal A is installed in the sealing spigot A in a pressed mode and makes contact with the end of the cylinder body. A shaft hole A and a shaft hole B are sequentially formed in the top and the bottom of the cylinder body, a connecting shaft is vertically inserted into the shaft hole A and the shaft hole B, a groove B is formed in the inner side of the shaft hole A in the circumferential direction, a sealing ring B is arranged in the groove B and makes contact with the outer side of the connecting shaft, a sealing spigot B is formed in the upper end of the shaft hole A, and a circular oil seal B is installed in the sealing spigot B in a pressed mode. According to the pneumatic actuating mechanism, the sealing rings and the circular oil seals are arranged at the two ends and the top of the cylinder body, so that air leakage and oil leakage of the cylinder body are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic actuators, and in particular relates to a pneumatic actuator with zero grease leakage under all working conditions. Background Art

[0002] The actuating and regulating mechanisms of a pneumatic actuator are a unified whole. Pneumatic actuators come in diaphragm, piston, scotch fork, and rack-and-pinion types. The piston type has a long stroke and is suitable for applications requiring high thrust. The principle of a pneumatic actuator is based on the compression and expansion of gas. When compressed air or gas enters the actuator through a control valve, the gas drives components such as pistons and gears within the mechanism to move. By varying the opening and closing of the control valve and the gas pressure, different movement modes of the mechanism can be achieved, such as pushing, pulling, and rotating. Pneumatic actuators offer advantages such as fast response, high torque, and high reliability, and are therefore widely used in automation devices and mechanical equipment in industrial production.

[0003] During use, the rotation of the connecting shaft and piston in pneumatic actuators causes the oil reservoir to move. The mechanical compression of the grease in the reservoir causes oil separation. Dynamic oil separation significantly impacts grease performance and can lead to grease leakage. During storage and transportation, static oil separation can also occur due to factors such as vibration, storage temperature, and storage time, leading to grease leakage. Utility Model Content

[0004] The utility model provides a pneumatic actuator with zero grease leakage under all working conditions, which solves the above-mentioned grease leakage problem.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] A pneumatic actuator with zero grease leakage under all working conditions comprises a cylinder body, with cylinder covers detachably connected to the left and right ends of the cylinder body, a groove A formed in an annular direction at the end of the cylinder cover, a sealing ring A disposed in the groove A, the sealing ring A being located inside the cylinder body and contacting the inner side wall of the cylinder body, a sealing stop A being provided on the side where the end of the cylinder cover contacts the end of the cylinder body, a circular oil seal A being press-fitted inside the sealing stop A, the circular oil seal A contacting the end of the cylinder body;

[0007] The top and bottom of the cylinder body are sequentially provided with an axial hole A and an axial hole B, and a connecting shaft is vertically inserted into the axial hole A and the axial hole B, and the connecting shaft is rotatably connected to the cylinder body. A groove B is provided on the inner side of the axial hole A along the circumferential direction, and a sealing ring B is provided in the groove B, and the sealing ring B contacts the outer side of the connecting shaft. A sealing stop B is provided at the upper end of the axial hole A, and a circular oil seal B is pressed inside the sealing stop B, and the circular oil seal B is located between the sealing stop B and the connecting shaft. A groove E is provided on the lower end of the connecting shaft along the circumferential direction, and a sealing ring E is provided in the groove E, and the sealing ring E contacts the inner side wall of the axial hole B.

[0008] Through the above technical solution, sealing ring A can improve the sealing performance at the connection between the outer end of the cylinder head and the interior of the cylinder body. Sealing seam A and circular oil seal A can improve the sealing performance of the contact surface between the cylinder head and the cylinder body. Sealing ring A, sealing seam A and circular oil seal A can improve the sealing performance at the connection between the cylinder head and the cylinder body, avoiding air and oil leakage. Sealing ring B at the upper end of the connecting shaft can improve the sealing performance when the connecting shaft rotates in the shaft hole A. Sealing seam B and circular oil seal B can seal the end of the connecting shaft that contacts the shaft hole A. Sealing ring B, sealing seam B and circular oil seal B can improve the sealing performance at the connection between the upper end of the connecting shaft and the cylinder body, avoiding air and oil leakage.

[0009] Optionally, a groove C is opened at the upper end of the connecting shaft, a support ring C is provided in the groove C, the support ring C contacts the inner wall of the shaft hole A, and the support ring C is located below the sealing ring B.

[0010] Through the above technical solution, the support ring C can improve the sealing performance of the connection between the connecting shaft and the cylinder body, and improve the sealing performance of the shaft hole A.

[0011] Optionally, a groove D is formed at the lower end of the connecting shaft along the circumferential direction, and the groove D is located above the groove E. A support ring D is provided in the groove D, and the support ring D contacts the inner side wall of the shaft hole B.

[0012] Through the above technical solution, the support ring D and the sealing ring E can improve the sealing performance at the connection between the lower end of the connecting shaft and the cylinder body, and improve the sealing performance at the shaft hole B.

[0013] Optionally, a gear is fixedly mounted on the outer side of the connecting shaft, pistons are respectively provided on the left and right sides of the connecting shaft, the pistons are provided with racks, the pistons are meshed with the gears through the racks, and the positions where the two pistons mesh with the gears are not on the same side of the connecting shaft.

[0014] Optionally, the piston is disc-shaped, and a groove F is formed on the piston along the circumferential direction. A sealing ring F is provided in the groove F, and the sealing ring F contacts the inner wall of the cylinder body.

[0015] Optionally, the outer wall of the cylinder body is provided with an air source hole A and an air source hole B which are arranged in parallel and at intervals.

[0016] Optionally, the outer wall of the cylinder body is threadedly connected to two parallel and spaced screw fasteners, and a positioning block is fixed on the upper end of the connecting shaft. The positioning block is located inside the cylinder body, and limiting protrusions are respectively provided on the left and right ends of the positioning block. The ends of the two screw fasteners respectively extend into the interior of the cylinder body, and the end of one of the screw fasteners contacts one of the limiting protrusions of the positioning block.

[0017] After adopting the above technical solution, the beneficial effects of the utility model are:

[0018] In the utility model, groove A, sealing ring A, sealing stop A and circular oil seal A are designed at the connection between the cylinder body and the cylinder head, thereby improving the sealing performance at the connection between the two ends of the cylinder body and the cylinder head, thereby avoiding air leakage and oil leakage. Groove B, sealing ring B, sealing stop B and circular oil seal B are designed at the connection between the connecting shaft and the cylinder body, thereby improving the sealing performance at the connection between the connecting shaft and the cylinder body, thereby avoiding air leakage and oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 2 is a schematic cross-sectional view of a pneumatic actuator in an embodiment;

[0021] Figure 2 It is a three-dimensional representation of the pneumatic actuator in the embodiment. Figure I ;

[0022] Figure 3 The three-dimensional structure of the pneumatic actuator in the embodiment Figure II (excluding cylinder body);

[0023] Figure 4 yes Figure 1 Enlarged view of point A in the middle;

[0024] Figure 5 yes Figure 1 Enlarged view of point B in the middle;

[0025] Figure 6 yes Figure 1 Enlarged view of point C in the middle;

[0026] Figure 7 yes Figure 1 Enlarged view of point D in the middle.

[0027] Explanation of the accompanying symbols: 1. cylinder body; 2. cylinder head; 3. groove A; 4. sealing ring A; 5. sealing stop A; 6. circular oil seal A; 7. connecting shaft; 8. groove B; 9. sealing ring B; 10. sealing stop B; 11. circular oil seal B; 12. groove C; 13. supporting ring C; 14. groove D; 15. supporting ring D; 16. groove E; 17. sealing ring E; 18. gear; 19. piston; 20. groove F; 21. sealing ring F; 22. air source hole A; 23. air source hole B; 24. screw fastener; 25. positioning block; 26. limiting protrusion. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The embodiment of the present application discloses a pneumatic actuator with zero grease leakage under all working conditions.

[0030] Example

[0031] according to Figures 1 to 7 As shown, a pneumatic actuator with zero grease leakage under all working conditions includes a cylinder body 1. Openings are provided on the left and right sides of the cylinder body 1. The openings are detachably connected to the cylinder head 2 by bolts. A groove A3 is circumferentially provided on the outer side of the end of the cylinder head 2. A sealing ring A4 is placed in the groove A3. The sealing ring A4 is located inside the cylinder body 1 and contacts the inner side wall of the cylinder body 1. A sealing stop A5 is provided on the side where the end of the cylinder head 2 contacts the end of the cylinder body 1. A circular oil seal A6 is press-fitted inside the sealing stop A5 and contacts the end of the cylinder body 1.

[0032] The top of the cylinder body 1 is provided with an axial hole A, and the bottom of the cylinder body 1 is provided with an axial hole B. The connecting line between the axial hole A and the axial hole B is vertically arranged. A connecting shaft 7 is vertically inserted into the axial hole A and the axial hole B. The connecting shaft 7 is rotatably connected to the cylinder body 1. A groove B8 is provided on the inner side of the axial hole A along the annular direction. A sealing ring B9 is provided in the groove B8. The sealing ring B9 contacts the outer side of the connecting shaft 7. A sealing stop B10 is provided on the upper end of the axial hole A. A circular oil seal B11 is press-fitted inside the sealing stop B10. The circular oil seal B11 Located between the sealing stop B10 and the connecting shaft 7, a groove C12 is provided at the upper end of the connecting shaft 7, and a support ring C13 is provided in the groove C12. The support ring C13 contacts the inner wall of the shaft hole A. The support ring C13 is located below the sealing ring B9. Grooves D14 and grooves E16 are respectively provided at the upper and lower ends of the connecting shaft 7 along the ring. A support ring D15 is provided in the groove D14, and a sealing ring E17 is provided in the groove E16. Both the support ring D15 and the sealing ring E17 contact the inner wall of the shaft hole B.

[0033] A gear 18 is sleeved and fixed on the outside of the connecting shaft 7. Pistons 19 are provided on either side of the connecting shaft 7. Pistons 19 are equipped with racks that mesh with gear 18 via the racks. The pistons 19 are disc-shaped, and the two pistons 19 mesh with gear 18 on different sides of the connecting shaft 7. A groove F20 is formed circumferentially in the piston 19. A sealing ring F21 is provided in the groove F20, which contacts the inner wall of the cylinder body 1.

[0034] The outer wall of the cylinder body 1 is provided with an air source hole A22 and an air source hole B23 arranged in parallel and spaced apart. The outer wall of the cylinder body 1 is threadedly connected to two screw fasteners 24 arranged in parallel and spaced apart. A positioning block 25 is fixed on the upper end of the connecting shaft 7. The positioning block 25 is located inside the cylinder body 1. Limiting protrusions 26 are respectively provided on the left and right ends of the positioning block 25. The ends of the two screw fasteners 24 respectively extend into the interior of the cylinder body 1, and the end of one of the screw fasteners 24 contacts one of the limiting protrusions 26 of the positioning block 25.

[0035] Grooves B8, E16 and F20 are oil storage tanks for storing lubricating oil; sealing rings B9, E17 and F21 are dynamic seals, and sealing rings B9, E17 and F21 are star-shaped sealing rings.

[0036] When air enters the air source hole A22, the pistons 19 are pushed by the gas, and the two pistons 19 move toward the two cylinder heads 2. The gas at both ends of the cylinder body 1 is discharged from the air source hole B23, and the connecting shaft 7 rotates. When the connecting shaft 7 rotates to the point where a limiting protrusion 26 of the positioning block 25 contacts the end of a screw fastener 24, the connecting shaft 7 stops rotating. When air enters the air source hole B23 and exits the air source hole A22, the connecting shaft 7 rotates in the opposite direction. When the connecting shaft 7 rotates to the point where another limiting protrusion 26 of the positioning block 25 contacts the end of another screw fastener 24, the connecting shaft 7 stops rotating. The specific structure and working principle of the cylinder body 1 belong to the prior art and are not within the scope of protection of the present utility model. They will not be described in detail here.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pneumatic actuator with zero grease leakage under all working conditions, characterized by: The cylinder body comprises a cylinder head, the left and right ends of which are detachably connected to each other, a groove A is formed in the circumferential direction at the end of the cylinder head, a sealing ring A is placed in the groove A, the sealing ring A is located inside the cylinder body and contacts the inner side wall of the cylinder body, a sealing stop A is provided on the side where the end of the cylinder head contacts the end of the cylinder body, a circular oil seal A is press-fitted inside the sealing stop A, and the circular oil seal A contacts the end of the cylinder body; The top and bottom of the cylinder body are sequentially provided with an axial hole A and an axial hole B, and a connecting shaft is vertically inserted into the axial hole A and the axial hole B, and the connecting shaft is rotatably connected to the cylinder body. A groove B is provided on the inner side of the axial hole A along the circumferential direction, and a sealing ring B is provided in the groove B, and the sealing ring B contacts the outer side of the connecting shaft. A sealing stop B is provided at the upper end of the axial hole A, and a circular oil seal B is pressed inside the sealing stop B, and the circular oil seal B is located between the sealing stop B and the connecting shaft. A groove E is provided on the lower end of the connecting shaft along the circumferential direction, and a sealing ring E is provided in the groove E, and the sealing ring E contacts the inner side wall of the axial hole B.

2. The pneumatic actuator with zero grease leakage under all working conditions according to claim 1, characterized in that: A groove C is formed at the upper end of the connecting shaft, and a support ring C is provided in the groove C. The support ring C contacts the inner side wall of the shaft hole A, and the support ring C is located below the sealing ring B.

3. The pneumatic actuator with zero grease leakage in all working conditions according to claim 1, characterized in that: A groove D is formed at the lower end of the connecting shaft along the circumferential direction. The groove D is located above the groove E. A support ring D is provided in the groove D. The support ring D contacts the inner side wall of the shaft hole B.

4. The pneumatic actuator with zero grease leakage in all working conditions according to claim 1, characterized in that: A gear is fixedly sleeved on the outer side of the connecting shaft, and pistons are respectively provided on the left and right sides of the connecting shaft. The pistons are provided with racks, and the pistons are meshed with the gears through the racks. The positions where the two pistons mesh with the gears are not on the same side of the connecting shaft.

5. The pneumatic actuator with zero grease leakage in all working conditions according to claim 4, characterized in that: The piston is disc-shaped and is provided with a groove F along the circumferential direction. The groove F is provided with a sealing ring F, and the sealing ring F contacts the inner side wall of the cylinder body.

6. The pneumatic actuator with zero grease leakage in all working conditions according to claim 4, characterized in that: The outer side wall of the cylinder body is provided with an air source hole A and an air source hole B which are arranged in parallel and at intervals.

7. The pneumatic actuator with zero grease leakage in all working conditions according to claim 4, characterized in that: The outer wall of the cylinder body is threadedly connected to two parallel and spaced screw fasteners, and a positioning block is fixed on the upper end of the connecting shaft. The positioning block is located inside the cylinder body, and limiting protrusions are respectively provided at the left and right ends of the positioning block. The ends of the two screw fasteners respectively extend into the interior of the cylinder body, and the end of one of the screw fasteners contacts one of the limiting protrusions of the positioning block.

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