Gear shaft transmission limiting structure and long-service-life pneumatic actuator applying same

Abstract

The utility model relates to the technical field of pneumatic actuators, in particular to a gear shaft transmission limiting structure and a long-service-life pneumatic actuator using the same. The gear shaft transmission limiting structure comprises a piston head and a rack connected with the piston head, straight teeth are arranged on the inner side of the rack, the gear shaft is meshed with the rack, a reinforcing rib is arranged in the middle of the rack in a penetrating mode, a limiting groove matched with the reinforcing rib is formed in the middle of the gear shaft, and the straight teeth are arranged on the inner side of the rack. The limiting blocks at the two ends of the gear shaft are correspondingly arranged on the end faces of the racks respectively. The long-service-life pneumatic actuator comprises a cylinder body and end covers arranged at the two ends of the cylinder body, and further comprises the gear shaft transmission limiting mechanism and spring seats arranged between the piston heads and the end covers. The gear shaft transmission limiting structure has the advantages of being good in stability, capable of reducing noise, long in service life, simple in structure, convenient to disassemble and assemble and the like, and the long-service-life pneumatic actuator using the gear shaft transmission limiting structure is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pneumatic actuator especially relates to gear shaft drive limiting structure and the long service life pneumatic actuator of application of this structure. BACKGROUND

[0002] Gear rack pneumatic actuator is through linear motion piston rack the linear motion of cylinder piston is converted into rotation, and rotation speed and output torque are even, the existing gear rack pneumatic actuator has certain drawbacks when using, first, the gear shaft of existing gear rack pneumatic actuator just relies on the positioning of outer snap spring, in the running process, gear shaft will fall due to the deformation of outer snap spring wear and other factors, even leak out the bottom of cylinder body, when using, certain influence is brought, second, gear rack pneumatic actuator switch is by the gear structure cooperation operation of rack and gear shaft in cylinder piston structure, outer snap spring wear and deformation lead to the activity clearance of gear shaft in cylinder body is larger, gear rack pneumatic actuator switch will appear gear shaft up and down shaking phenomenon, the disturbance of the piston yoke end that cooperates also appears, thereby the vibration of gear rack pneumatic actuator when working appears, even lead to the noise of cylinder body friction when piston runs, reduce the service life of actuator.

[0003] Chinese patent CN207648244U discloses a kind of gear rack structure of pneumatic actuator, including actuator main body, the front end of the actuator main body is fixedly installed with cylinder, and the rear end of cylinder is fixedly installed with piston, the outer surface of the piston is movably installed with yoke near upper end position, and the front end of yoke is movably installed with rack, the inside of the rack is provided with damping rubber ring, and the two ends of the piston are fixedly installed with No. The structure of a kind of gear rack structure of pneumatic actuator disclosed in the utility model is provided with No. One reinforcing rib, second reinforcing rib, damping rubber ring and glass fiber, which can improve the structural reliability of cylinder piston during operation, effectively increase the strength of rack, so that the structural strength can exceed the yield strength of the material itself, and effectively reduce vibration, improve the service life of actuator, also can prevent corrosion, reduce noise, have certain practicality, bring better use prospect.

[0004] But the technical scheme does not further limit the gear shaft, and the up-and-down shaking phenomenon still occurs when using, and the disturbance of the piston yoke end also occurs, so that the pneumatic actuator is not stable enough, which affects the use. UTILITY MODEL CONTENT

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a gear shaft transmission limiting structure and a high-life pneumatic actuator using this structure. By installing the reinforcing rib in the middle of the rack into a matching limiting groove in the middle of the gear shaft, the gear shaft is limited and fixed, making its operation more stable and solving the problem of gear shaft vibration in existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A gear shaft transmission limiting structure includes: a piston head and a rack connected to the piston head, the rack having straight teeth on its inner side; and a gear shaft meshing with the rack, a reinforcing rib penetrating through the middle of the rack, a limiting groove adapted to the reinforcing rib being provided in the middle of the gear shaft, and limiting blocks at both ends of the gear shaft being respectively disposed on the end faces of the rack.

[0008] Preferably, the outer side of the rack has several cavities.

[0009] Preferably, the outer surface of the rack is provided with several rows of protrusions.

[0010] Preferably, the protrusions and the cavities are arranged sequentially and at intervals.

[0011] Preferably, a bearing is disposed close to the outer side of the limiting block, and the bearing is sleeved on the gear shaft.

[0012] Preferably, a position indicator is provided on the outer side of the bearing, and the position indicator is located at the end of the gear shaft.

[0013] A high-life pneumatic actuator includes: a cylinder body and end caps disposed at both ends of the cylinder body, and further includes: the aforementioned gear shaft transmission limiting mechanism and a spring seat disposed between the piston head and the end caps.

[0014] Preferably, the protrusion abuts against the inner wall of the cylinder.

[0015] Preferably, a plurality of horizontal bolts are provided through the cylinder body on the side near the position indicator, the ends of the horizontal bolts are located near the limiting block, and the horizontal bolts are located above the rack.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) By setting several cavities on the outside of the rack, this utility model helps to reduce the pressure buildup inside the pneumatic actuator, prevent component damage or performance degradation caused by pressure buildup, and the cavities can alleviate pressure changes during gas discharge, thereby reducing noise.

[0018] (2) This utility model provides several rows of protrusions on the outer surface of the rack. The protrusions can serve as guides to ensure that the rack moves smoothly and accurately in the cylinder, reducing wear caused by friction or offset. The presence of the protrusions increases the contact area between the rack and the cylinder, thereby improving the stability and reliability of the entire pneumatic actuator.

[0019] (3) By abutting against the inner wall of the cylinder, the present invention helps to maintain the alignment between the rack and the inner wall of the cylinder, thereby achieving precise control of the opening and closing of the valve. When the pneumatic actuator is working, the protrusion can reduce the lateral force on the rack and prevent the rack from shifting or being damaged due to uneven force.

[0020] (4) By setting horizontal bolts on the cylinder body, the pneumatic actuator can withstand the torque generated by air pressure when it is working, thus ensuring the stability of the cylinder body and connecting parts. When the horizontal bolts are used to fix the pneumatic actuator to the valve or other equipment, they can ensure the correct alignment between the actuator and the valve.

[0021] In summary, this utility model has the advantages of good stability, reduced noise, long service life, simple structure, and convenient assembly and disassembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0023] Figure 2 This is a schematic diagram of the internal installation of the gear shaft in Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model;

[0025] Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are 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 component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Example 1

[0029] like Figure 1 and Figure 2 As shown, this embodiment provides a gear shaft transmission limiting structure, including: a piston head 1 and a rack 2 connected to the piston head 1. The rack 2 has spur teeth 21 on its inner side. It also includes: a gear shaft 3 that meshes with the rack 2. A reinforcing rib 22 is provided through the middle of the rack 2. A limiting groove 31 adapted to the reinforcing rib 22 is provided in the middle of the gear shaft 3. Limiting blocks 32 at both ends of the gear shaft 3 are respectively provided on the end face of the rack 2. This can prevent the gear shaft 3 from falling off and reduce the wear of the nylon gasket, thus extending its service life.

[0030] The piston head 1 is provided with rubber sealing rings 11 and composite sealing rings 12 in a stacked manner from the inside to the outside, which can reduce friction and ensure its sealing performance.

[0031] Meanwhile, the outer side of the rack 2 is provided with several cavities 23. The cavities 23 help to reduce the pressure buildup inside the pneumatic actuator, i.e., the exhaust function, to prevent component damage or performance degradation caused by pressure buildup. In addition, the cavities 23 can alleviate pressure changes during gas exhaust, thereby reducing noise.

[0032] In this embodiment, the outer surface of the rack 2 is provided with several rows of protrusions 24. The protrusions 24 can serve as guides to ensure that the rack 2 moves smoothly and accurately within the cylinder 4, reducing wear caused by friction or offset. Furthermore, the presence of the protrusions 24 increases the contact area between the rack 2 and the cylinder 4, thereby improving the stability and reliability of the entire pneumatic actuator.

[0033] In this embodiment, the protrusion 24 and the cavity 23 are arranged sequentially and alternately to reduce the direct contact between the rack 2 and the inner wall of the cylinder 4, thereby reducing wear and extending the service life of the pneumatic actuator.

[0034] Of course, a bearing 33 is provided close to the outer side of the limiting block 32, and the bearing 33 is sleeved on the gear shaft 3.

[0035] In addition, a position indicator 34 is provided on the outer side of the bearing 33. The position indicator 34 is located at the end of the gear shaft 3. It has a compact structure and is easy to disassemble and assemble.

[0036] Example 2

[0037] like Figure 3 and Figure 4 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0038] This embodiment provides a high-life pneumatic actuator, including: a cylinder body 4 and end caps 5 disposed at both ends of the cylinder body 4, and also including: a gear shaft 3 transmission limiting mechanism as described in Embodiment 1 and a spring seat 6 disposed between the piston head 1 and the end caps 5. The anti-dislodgement design of the gear shaft 3 can eliminate disturbances during the operation of the piston head 1, improve the reliability and service life of the pneumatic actuator, is suitable for high-frequency operation, has certain practicality, and has a switching cycle of more than 1 million times (with a 1 million cycle test report witnessed by a TUV organization), which can bring better application prospects.

[0039] The working medium for this pneumatic actuator is generally dry or humid air. Inert or non-corrosive gases should be compatible with the internal components and lubricants of the actuator. The dew point of the working medium is approximately -20°C or 10°C lower than the ambient temperature. The maximum particle size of inhalable particulate matter is no greater than 30µm. Under normal conditions, the working air pressure for both double-acting and single-acting actuators is between 2.5 bar and 8 bar.

[0040] Of course, the protrusion 24 abuts against the inner wall of the cylinder 4. At this time, the protrusion 24 helps to maintain the alignment between the rack 2 and the inner wall of the cylinder 4, thereby achieving precise control of the opening and closing of the valve. When the pneumatic actuator is working, the protrusion 24 can reduce the lateral force on the rack 2 and prevent the rack 2 from shifting or being damaged due to uneven force.

[0041] In addition, a number of horizontal bolts 41 are provided through one side of the cylinder body 4 near the position indicator 34. The ends of the horizontal bolts 41 are located near the limiting block 32 and are positioned above the rack 2. The horizontal bolts 41 are used to fix the pneumatic actuator to the valve or other equipment to ensure the correct alignment between the actuator and the valve. When the pneumatic actuator is working, the horizontal bolts 41 can withstand the torque generated by the air pressure, ensuring the stability of the cylinder body 4 and the connecting parts.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gear shaft transmission limiting structure, comprising: The piston head and the rack connected to the piston head, wherein the rack has straight teeth on its inner side, characterized in that it further includes: a gear shaft meshing with the rack, wherein a reinforcing rib is provided through the middle of the rack, a limiting groove adapted to the reinforcing rib is provided in the middle of the gear shaft, and limiting blocks at both ends of the gear shaft are respectively provided on the end faces of the rack.

2. The gear shaft transmission limiting structure according to claim 1, characterized in that, The outer side of the rack has several cavities.

3. The gear shaft transmission limiting structure according to claim 2, characterized in that, The outer surface of the rack is provided with several rows of protrusions.

4. The gear shaft transmission limiting structure according to claim 3, characterized in that, The protrusions and the cavity are arranged sequentially and at intervals.

5. The gear shaft transmission limiting structure according to claim 1, characterized in that, A bearing is provided close to the outer side of the limiting block, and the bearing is sleeved on the gear shaft.

6. The gear shaft transmission limiting structure according to claim 5, characterized in that, A position indicator is provided on the outer side of the bearing, and the position indicator is located at the end of the gear shaft.

7. A long-life pneumatic actuator, comprising: The cylinder body and the end caps disposed at both ends of the cylinder body are characterized in that they further include: a gear shaft transmission limiting structure as described in any one of claims 1-6 and a spring seat disposed between the piston head and the end caps.

8. A high-lifespan pneumatic actuator according to claim 7, characterized in that, The protrusion abuts against the inner wall of the cylinder.

9. A high-lifespan pneumatic actuator according to claim 7, characterized in that, Several horizontal bolts are provided through the cylinder body on the side near the position indicator. The ends of the horizontal bolts are located near the limiting block, and the horizontal bolts are positioned above the rack.

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