Shifting fork type pneumatic actuator

Abstract

The utility model discloses a shifting fork type pneumatic actuator which comprises a shell and a partition plate arranged in the shell, and the interior of the shell is divided into a first cavity and a second cavity through the partition plate. A shifting fork and a transmission shaft are arranged in the first cavity, and the shifting fork is meshed with a tooth groove formed in the transmission shaft through a rack. A piston is also arranged in the second cavity; wherein the shifting fork penetrates through the partition plate through an arranged connecting rod and then is connected with the piston, and a protruding part is further arranged on the face, facing the partition plate, of the piston. The second cavity is further provided with a first air inlet and a second air inlet, and exhaust ports are formed in the lower portion of the first air inlet and the lower portion of the second air inlet. In conclusion, due to the fact that the transmission shaft and the shifting fork are in rack transmission, the actuator has the advantages of being large in bearing capacity, high in transmission precision and high in transmission speed while the transmission efficiency is improved, and meanwhile the moving stroke of the piston can be limited through the partition plate.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, specifically a pneumatic actuator of the fork type. Background Technology

[0002] Based on existing pneumatic actuators, such as those with publication numbers CN111946888A or CN222458566U, the power transmission between the shift fork and the transmission component is lever-driven. This lever-driven transmission has low efficiency, significant wear, and, most importantly, generates considerable impact and vibration, affecting transmission smoothness and lifespan. Utility Model Content

[0003] The purpose of this invention is to provide a pneumatic actuator with a fork to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic actuator with a shift fork, comprising a housing and a partition disposed inside the housing, the partition dividing the interior of the housing into a first cavity and a second cavity; the first cavity is provided with a shift fork and a drive shaft, the shift fork engaging with a toothed groove on the drive shaft via a rack; the second cavity is also provided with a piston; wherein, the shift fork is connected to the piston after passing through the partition via a connecting rod, and the piston has a protrusion on the side facing the partition; the second cavity is also provided with a first air inlet and a second air inlet, and both the first air inlet and the second air inlet have an exhaust port below them; after the air source enters the second cavity through the first air inlet or the second air inlet, it causes the piston to move towards the second air inlet or towards the first air inlet.

[0005] As a preferred technical solution of this utility model: the first cavity is further provided with a guide plate, and the guide plate guides the fork to slide in a directional manner.

[0006] As a preferred technical solution of this utility model: the guide plate is provided with a guide hole in the middle, and one end of the fork passes through the guide hole and slides in the guide hole.

[0007] As a preferred technical solution of this utility model, it further includes a bolt, and one end of the bolt passes through the piston and is connected to one end of the connecting rod.

[0008] As a preferred technical solution of this utility model: the upper end of the transmission shaft is provided with a pointer, and the lower end of the transmission shaft is also provided with a connection port.

[0009] As a preferred technical solution of this utility model: the housing is further provided with an indicator area to facilitate pointer rotation, and the indicator area is connected to the provided transparent cover.

[0010] The beneficial effects of this utility model by adopting the above technical solution are: 1. Since the transmission shaft and the shift fork are connected by rack and pinion, the actuator has the advantages of high load capacity, high transmission accuracy and high transmission speed while improving transmission efficiency;

[0011] 2. Since the protrusion abuts against the partition or the shift fork abuts against the partition, the partition can not only perform the function of partitioning, but also limit the movement distance of the piston. Therefore, it can ensure the uniformity of the rotation angle of the drive shaft each time, so as to completely solve the problem of uncontrollable rotation angle of the drive shaft caused by excessive piston movement. In addition, the limiting structure of this actuator is simpler and more reliable. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0013] Figure 2 This is an exploded structural diagram of the present invention;

[0014] Figure 3 This is a schematic diagram showing the state of the pointer of this utility model when it rotates to the first position;

[0015] Figure 4 This is a schematic diagram showing the state of the pointer of this utility model when it rotates to the second position;

[0016] Figure 5 This is a schematic diagram of the main structure of the drive shaft of this utility model;

[0017] Figure 6 This is a schematic diagram of the main structure of the shift fork of this utility model.

[0018] In the diagram: 1. Housing; 2. Transparent cover; 3. First air inlet; 4. Second air inlet; 5. Exhaust port; 6. Rack; 7. Connecting rod; 8. Gear groove; 9. Pointer; 10. Bolt; 11. Piston; 12. Shift fork; 13. Guide plate; 14. First cavity; 15. Drive shaft; 16. Second cavity; 17. Indicator area; 18. Guide hole; 19. Connection port; 20. Partition; 21. Protrusion. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model.

[0020] Please see Figure 1-6 This utility model provides an embodiment of a pneumatic actuator with a fork, comprising a housing 1 and a partition 20 disposed inside the housing 1, and the partition 20 dividing the interior of the housing 1 into a first cavity 14 and a second cavity 16; the first cavity 14 is provided with a fork 12 and a drive shaft 15, and the fork 12 meshes with the toothed groove 8 provided on the drive shaft 15 through a rack 6; therefore, by using rack and pinion transmission, the problem of low transmission efficiency and severe wear between parts caused by the use of lever structure transmission in existing equipment is solved.

[0021] The second cavity 16 is also equipped with a piston 11; wherein, the fork 12 is connected to the piston 11 after passing through the partition 20 via a connecting rod 7, and the piston 11 is also provided with a protrusion 21 on the side facing the partition 20. Therefore, when one end of the connecting rod 7 abuts against the partition 20, it can prevent the piston 11 from moving to the left under the action of air pressure, and the protrusion 21 is used to prevent the piston 11 from moving to the right under the action of air pressure, so as to limit the stroke of the piston 11. In particular, the protrusion 21 abuts against the partition 20, so that the air source can pass through the first air inlet 3 and cause the piston 11 to move to the left; after the air source enters the second cavity 16 through the first air inlet 3 or through the second air inlet 4, it causes the piston 11 to move towards the second air inlet 4 or towards the first air inlet 3. Since the second cavity 16 is also provided with a first air inlet 3 and a second air inlet 4, and both the first air inlet 3 and the second air inlet 4 are provided with exhaust ports 5 below them, the piston 11 has less resistance when it moves.

[0022] In summary, since the drive shaft 15 and the shift fork 12 are connected by a rack and pinion drive, the actuator not only improves transmission efficiency but also has the advantages of high load-bearing capacity, high transmission accuracy, and high transmission speed. At the same time, by using the protrusion 21 to abut against the partition plate 20 or by using the shift fork 12 to abut against the partition plate 20, the partition plate 20 can not only perform the function of partitioning but also limit the movement distance of the piston 11. Therefore, it can ensure the uniformity of the rotation angle of the drive shaft each time, so as to completely solve the problem of uncontrollable rotation angle of the rotating shaft 15 caused by excessive piston movement. In addition, the limiting structure of the actuator is simpler and more reliable.

[0023] Furthermore, a guide plate 13 is also provided inside the first cavity 14, and the fork 12 is guided to slide in a specific direction through the guide plate 13. Specifically, a guide hole 18 is provided in the middle of the guide plate 13, and one end of the fork 12 slides within the guide hole 18 after passing through the guide hole 18.

[0024] In summary, this design allows the end of the shift fork 12 furthest from the piston 11 to slide within the guide hole 18. Therefore, while ensuring the directional sliding of the shift fork 12, it also provides support, guaranteeing smooth and reliable operation of the shift fork 12. Screws or other fasteners are inserted through the bottom surface of the housing 1 and connected to threaded holes on the guide plate 13 to fix the guide plate 13 within the first cavity 14.

[0025] In addition, to facilitate the assembly of piston 11 and shift fork 12 and subsequent maintenance, one end of bolt 10 passes through piston 11 and is connected to one end of connecting rod 7. Therefore, piston 11 and shift fork 12 can be separated by disassembling bolt 10, and the linkage between piston 11 and shift fork 12 can be ensured by fixing shift fork 12 to piston 11 with bolt 10.

[0026] Based on the above scheme, the upper end of the transmission shaft 15 is provided with a pointer 9. Therefore, the rotation of the pointer 9 can be used to remind the user of the current position of the transmission shaft 15, so that the user can more intuitively understand the working status of the transmission shaft 15. In addition, the lower end of the transmission shaft 15 is also provided with a connection port 19, which makes it easy to connect the actuator to the valve stem of the valve through the connection port 19.

[0027] Furthermore, since the housing 1 is also provided with an indicator area 17 to facilitate the rotation of the pointer 9, and the indicator area 17 is connected to the provided transparent cover 2, the pointer 9 can be protected by the transparent cover 2 without affecting the user's viewing of the working status of the drive shaft 15.

[0028] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A pneumatic actuator of the fork type, characterized in that: It includes a housing (1) and a partition (20) disposed inside the housing (1), and the interior of the housing (1) is divided into a first cavity (14) and a second cavity (16) by the partition (20). The first cavity (14) is provided with a shift fork (12) and a drive shaft (15). The shift fork (12) meshes with the toothed groove (8) on the drive shaft (15) through a rack (6). The second cavity (16) is also provided with a piston (11); wherein, the fork (12) passes through the partition (20) via a connecting rod (7) and is connected to the piston (11), and the piston (11) is also provided with a protrusion (21) on the side facing the partition (20). The second cavity (16) is also provided with a first air inlet (3) and a second air inlet (4), and an exhaust port (5) is provided below both the first air inlet (3) and the second air inlet (4); After the air source enters the second cavity (16) through the first air inlet (3) or the second air inlet (4), it causes the piston (11) to move toward the second air inlet (4) or toward the first air inlet (3).

2. The pneumatic actuator of the fork type according to claim 1, characterized in that: The first cavity (14) is also provided with a guide plate (13), and the guide plate (13) guides the fork (12) to slide in a specific direction.

3. A fork-type pneumatic actuator according to claim 2, characterized in that: The guide plate (13) has a guide hole (18) in the middle, and one end of the fork (12) slides in the guide hole (18) after passing through the guide hole (18).

4. A fork-type pneumatic actuator according to claim 3, characterized in that: It also includes a bolt (10), one end of which passes through the piston (11) and is connected to one end of the connecting rod (7).

5. A fork-type pneumatic actuator according to any one of claims 1-4, characterized in that: The upper end of the drive shaft (15) is provided with a pointer (9), and the lower end of the drive shaft (15) is also provided with a connection port (19).

6. A pneumatic actuator of the fork type according to claim 5, characterized in that: The housing (1) is also provided with an indicator area (17) to facilitate the rotation of the pointer (9), and the indicator area (17) is connected to the provided transparent cover (2).

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