Pneumatic actuator with load protection mechanism

Abstract

The utility model belongs to the technical field of actuators, and particularly relates to a pneumatic actuator with a load protection mechanism, which comprises an actuator shell, an output shaft is rotatably connected with an inner shaft of the actuator shell, the output shaft is coaxially and fixedly connected with a connecting shaft connected with a driving component, and a protection mechanism is arranged in the actuator shell. According to the utility model, the protection mechanism is arranged to monitor and protect the load, contact between the convex block and the push switch, cut off the air source, effectively prevent the actuator from continuously bearing overlarge load, adjust the distance between the screw rod and the rack II, and flexibly adjust the load protection range; the actuator can adapt to different working environments and load requirements, universality and practicability of the actuator are improved, equipment damage and maintenance cost caused by overload are reduced, and the actuator has the advantages of being efficient in load protection, flexible in adjustment performance, reliable in safety performance, wide in application field and the like.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to a pneumatic actuator with a load protection mechanism. Background Technology

[0002] Pneumatic actuators are an essential component of automatic control systems and are widely used in production processes such as chemical, papermaking, and oil refining. They can be easily used with passive instruments. Pneumatic actuators are actuators that use air pressure to open, close, or regulate valves; they are also known as pneumatic actuators or pneumatic devices.

[0003] Pneumatic actuators with load protection mechanisms can protect the actuator from damage through specific designs or mechanisms when the load is too heavy or when encountering abnormal conditions. However, traditional load protection actuators are difficult to adjust the load protection range flexibly during use and cannot adapt to different working environments and load requirements. Their versatility and practicality need to be further improved.

[0004] To address the aforementioned technical shortcomings, a solution is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatic actuator with a load protection mechanism. By setting up a protection mechanism, the load is monitored and protected, effectively preventing the actuator from continuing to bear excessive load. Adjusting the distance between the screw and the rack allows for flexible adjustment of the load protection range, enabling the actuator to adapt to different working environments and load requirements, improving its versatility and practicality, and solving the problems raised in the background art.

[0006] The purpose of this utility model can be achieved through the following technical solution: a pneumatic actuator with a load protection mechanism, including an actuator housing, an output shaft rotatably connected to the actuator housing, a connecting shaft coaxially fixedly connected to the output shaft and connected to the drive assembly, and a protection mechanism provided inside the actuator housing;

[0007] The protection mechanism includes a sector tooth fixedly connected to the outer contour of the connecting shaft. A rack 1 that meshes with the sector tooth is horizontally slidably connected inside the actuator housing. A rotating shaft is rotatably connected to the actuator housing. A mounting base is fixedly provided on one side of the actuator housing near the rotating shaft. A protrusion that intermittently contacts a trigger switch on the mounting base is fixedly connected to the outer contour of the rotating shaft. A screw is threaded through and screwed onto the rack 1. A rack 2 is provided on one side of the rotating shaft. A gear 1 that meshes with the rack 2 is threaded through and fixedly connected to the rotating shaft.

[0008] Preferably, the outer wall of the actuator housing is penetrated and rotatably connected by a pin, and the pin is fixedly connected to a key shaft that penetrates the screw and is horizontally slidably connected to the screw at its shaft end near the screw.

[0009] Preferably, a connecting block is fixedly connected to the upper surface of the rack, and two limiting rods are fixedly connected to the inner wall of the actuator housing. The two limiting rods pass through the connecting block and are slidably connected to the connecting block in the horizontal direction.

[0010] Preferably, a washer is fixedly connected to one end of rack one near rack two, and a washer two corresponding to washer one is fixedly connected to one end of rack two near rack one.

[0011] Preferably, a limiting rod two is fixedly connected to the inner wall of the actuator housing, and the limiting rod two passes through the rack two and is slidably connected to the rack two in the horizontal direction.

[0012] Preferably, a spring is fitted on the outer contour of the limiting rod, one end of the spring abuts against the two ends of the rack, and the other end of the spring abuts against the inner wall of the actuator housing.

[0013] The beneficial effects of this utility model are:

[0014] (1) This utility model achieves load monitoring and protection by setting up a protection mechanism, which can flexibly adjust the range of load protection, so that the actuator can adapt to different working environments and load requirements, improve its versatility and practicality, prevent the actuator from working for a long time under excessive load, effectively extend the service life of the equipment, reduce equipment damage and maintenance costs caused by overload, and has the advantages of efficient load protection, flexible adjustment performance, reliable safety performance and wide application fields.

[0015] (2) The present invention also pushes rack two through spring, and pushes gear one through rack two to rotate, and the corresponding protrusion rotates and resets. After the air source is restored or the abnormal situation is resolved, the protection mechanism can automatically adjust its state and prepare for the next operation of the protection mechanism. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings;

[0017] Figure 1 This utility model has a three-dimensional overall structure. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the interior of the actuator housing of this utility model;

[0019] Figure 3 This is a schematic cross-sectional view of the structure of this utility model;

[0020] Figure 4 This is a top view of the structure of this utility model;

[0021] Figure 5This is a schematic diagram of the screw structure of this utility model.

[0022] Legend: 1. Actuator housing; 2. Output shaft; 3. Connecting shaft; 4. Sector gear; 5. Rack 1; 6. Rack 2; 7. Screw; 8. Washer 1; 9. Gear 1; 10. Rotating shaft; 11. Protrusion; 12. Mounting base; 13. Limiting rod 2; 14. Spring; 15. Limiting rod 1; 16. Connecting block; 17. Pin. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Please refer to Figure 1-Figure 5 As shown, this embodiment is a pneumatic actuator with a load protection mechanism, including an actuator housing 1, an output shaft 2 rotatably connected to the actuator housing 1, a connecting shaft 3 coaxially fixedly connected to the output shaft 2 and connected to the drive assembly, the drive assembly is a cylinder, the cylinder extension end pushes the gear meshing with the rack to move, and is connected to the connecting shaft 3 for transmission, and a protection mechanism is provided inside the actuator housing 1;

[0025] The protection mechanism includes a sector tooth 4 fixedly connected to the outer contour of the connecting shaft 3, a rack 5 that meshes with the sector tooth 4 and is horizontally slidably connected inside the actuator housing 1, a rotating shaft 10 is fixedly connected inside the actuator housing 1, a mounting base 12 is fixedly provided on the side of the actuator housing 1 near the rotating shaft 10, a protrusion 11 that intermittently contacts the trigger switch on the mounting base 12 is fixedly connected to the outer contour of the rotating shaft 10, and a screw 7 is screwed through and screwed onto the rack 5.

[0026] When the screw 7 rotates, the distance between the end of the screw 7 and the rack 6 can be adjusted, thereby adjusting the load protection range. The rack 6 is provided on one side of the shaft 10, and the gear 9 that meshes with the rack 6 is connected through and fixed to the shaft 10.

[0027] When the connecting shaft 3 rotates towards the maximum load, the sector tooth 4 deflects and drives the rack 5 meshing with it to move. The rack 5 moves towards the rack 6 and pushes the rack 6, which causes the gear 9 meshing with the rack 6 to drive the rotating shaft 10 to rotate. The protrusion 11 on the rotating shaft 10 rotates and contacts the push switch on the side of the mounting base 12, cutting off the air supply and preventing the actuator from continuing to bear excessive load, thus avoiding equipment damage or safety accidents and achieving load protection.

[0028] The outer wall of the actuator housing 1 is penetrated and rotatably connected by a pin 17. The pin 17 is fixedly connected to a key shaft that passes through the screw 7 and is horizontally slidably connected to the screw 7 near the shaft end of the screw 7. Rotating the pin 17 can cause the screw 7, which is inserted into the key shaft, to rotate. The screw 7 rotates within the rack 5 and moves, so that the end of the screw 7 is close to or away from the rack 6, thereby adjusting the load protection range.

[0029] A connecting block 16 is fixedly connected to the upper surface of rack 5, and two limiting rods 15 are fixedly connected to the inner wall of actuator housing 1. The two limiting rods 15 pass through the connecting block 16 and slide horizontally connected to the connecting block 16. The two limiting rods 15 limit the horizontal movement of rack 5, ensuring that the limiting rods 15 move stably in the horizontal direction.

[0030] A washer 8 is fixedly connected to one end of rack 5 near rack 6, and a washer 2 corresponding to washer 8 is fixedly connected to one end of rack 6 near rack 5. Both washer 8 and washer 2 are made of rubber to ensure that screw 7 can stably push rack 6 to move. A stop is provided on the lower surface of actuator housing 1 to position rack 6 and prevent rack 6 from popping out directly.

[0031] Example 2: Please refer to Figure 1-Figure 5 As shown, in this embodiment, a pneumatic actuator with a load protection mechanism is provided. A limit rod 13 is fixedly connected to the inner wall of the actuator housing 1. The limit rod 13 passes through the rack 6 and is slidably connected to the rack 6 in the horizontal direction. By setting the limit rod 13, the horizontal position of the rack 6 is limited, ensuring the stability of the rack 6 in the horizontal direction.

[0032] A spring 14 is fitted on the outer contour of the limit rod 13. One end of the spring 14 abuts against the end of the rack 6, and the other end of the spring 14 abuts against the inner wall of the actuator housing 1. By setting the spring 14, the spring 14 pushes the rack 6, and the rack 6 pushes the gear 9 to rotate. The corresponding protrusion 11 rotates and resets. After the air source is restored or the abnormal situation is resolved, the protection mechanism can automatically adjust its state and prepare for the next operation of the protection mechanism.

[0033] As can be seen from Embodiments 1 and 2, by setting up a protection mechanism, the load is monitored and protected, effectively preventing the actuator from continuing to bear excessive load. Adjusting the distance between the screw 7 and the rack 6 can flexibly adjust the range of load protection, enabling the actuator to adapt to different working environments and load requirements, improving its versatility and practicality. Timely cut-off of the air supply prevents the actuator from working for a long time under excessive load, effectively extending the service life of the equipment and reducing equipment damage and maintenance costs caused by overload.

[0034] Furthermore, the rack 2 6 is pushed by the spring 14, and the gear 1 9 is rotated by the rack 2 6. The corresponding protrusion 11 rotates and resets. After the air source is restored or the abnormal situation is resolved, the protection mechanism can automatically adjust its state and prepare for the next operation. It has the advantages of efficient load protection, flexible adjustment performance, reliable safety performance and wide range of applications.

[0035] like Figure 1-Figure 5 As shown, the working process and principle of this utility model are as follows:

[0036] Step 1: When compressed air enters the pneumatic actuator, the gas pushes the piston to move linearly to both ends. The rack on the piston drives the gear on the connecting shaft 3 to rotate, thereby opening or closing the valve. When the connecting shaft 3 rotates, the rack 5 that meshes with the sector tooth 4 on the connecting shaft 3 moves. The rack 5 moves towards the rack 6. The screw 7 on the rack 5 moves closer to the end of the rack 6. The washer 8 on the screw 7 contacts the washer 2 on the rack 6, pushing the rack 6 to move against the elastic force of the spring 14. The gear 9 that meshes with the rack 6 drives the rotating shaft 10 to rotate. The protrusion 11 that is fixedly connected to the rotating shaft 10 swings and contacts the push switch on the mounting base 12.

[0037] Step 2: Rotating the pin 17 will cause the screw 7, which is connected to the key shaft on the pin 17, to rotate. The screw 7 rotates within the rack 5 and moves, allowing the end of the screw 7 to move closer to or further away from the rack 6. By adjusting the distance between the end of the screw 7 and the rack 6, the load protection range can be adjusted.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pneumatic actuator with a load protection mechanism, comprising an actuator housing (1), characterized in that, An output shaft (2) is rotatably connected to the actuator housing (1) on a fixed axis. The output shaft (2) is coaxially fixedly connected to a connecting shaft (3) that is connected to the drive assembly. A protective mechanism is provided inside the actuator housing (1). The protection mechanism includes a sector tooth (4) fixedly connected to the outer contour of the connecting shaft (3), a rack (5) that meshes with the sector tooth (4) is horizontally slidably connected inside the actuator housing (1), a rotating shaft (10) is fixedly connected inside the actuator housing (1), a mounting base (12) is fixedly provided on the side of the actuator housing (1) near the rotating shaft (10), a protrusion (11) that intermittently contacts the trigger switch on the mounting base (12) is fixedly connected to the outer contour of the rotating shaft (10), a screw (7) is screwed through the rack (5), a rack (6) is provided on one side of the rotating shaft (10), and a gear (9) that meshes with the rack (6) is screwed through and fixedly connected to the rotating shaft (10).

2. A pneumatic actuator with a load protection mechanism according to claim 1, characterized in that, The outer wall of the actuator housing (1) is penetrated and rotatably connected by a pin (17). The pin (17) is fixedly connected to a key shaft that penetrates the screw (7) and is horizontally slidably connected to the screw (7) near the shaft end of the screw (7).

3. A pneumatic actuator with a load protection mechanism according to claim 1, characterized in that, A connecting block (16) is fixedly connected to the upper surface of the rack (5), and two limiting rods (15) are fixedly connected to the inner wall of the actuator housing (1). The two limiting rods (15) pass through the connecting block (16) and slide horizontally connected to the connecting block (16).

4. A pneumatic actuator with a load protection mechanism according to claim 1, characterized in that, A gasket 1 (8) is fixedly connected to one end of the rack 1 (5) near the rack 2 (6), and a gasket 2 corresponding to the gasket 1 (8) is fixedly connected to one end of the rack 2 (6) near the rack 1 (5).

5. A pneumatic actuator with a load protection mechanism according to claim 1, characterized in that, The actuator housing (1) is fixedly connected to the inner wall of the limiting rod (13), which passes through the rack (6) and is slidably connected to the rack (6) in the horizontal direction.

6. A pneumatic actuator with a load protection mechanism according to claim 5, characterized in that, A spring (14) is fitted on the outer contour of the limiting rod 2 (13). One end of the spring (14) abuts against the end of the rack 2 (6), and the other end of the spring (14) abuts against the inner wall of the actuator housing (1).

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