A piston end resilient support mechanism for a pneumatic actuator

Abstract

The utility model relates to actuator technical field, concretely is a kind of piston end elastic support mechanism for pneumatic actuator, including cylinder body, piston is arranged in the cylinder body, and it is sealed by being set with the end cap of the end of the cylinder body, forms piston movable cavity, the outside wall of the piston is provided with first spring assembly insertion slot, the inner wall of the end cap is provided with the second spring assembly insertion slot corresponding with the first spring assembly insertion slot, one end of spring assembly is inserted with the first spring assembly insertion slot, and the other end is inserted with the second spring assembly insertion slot. This mechanism component simple structure can effectively solve the technical problem that one spring exists between piston and end cap in prior art, such as spring failure, uneven stress, unstable reset, insufficient torque, easy to jam. It provides guarantee for the stable work of actuator, and effectively prolongs the service life of actuator.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to an elastic support mechanism for the piston end of a pneumatic actuator. Background Technology

[0002] Actuators are an essential component of automatic control systems. Their function is to receive control signals from the controller, change the magnitude of the controlled medium, and thus maintain the controlled variable at the required value or within a certain range. They are widely used in industries such as petrochemicals and metallurgy, and are mostly used for remote control. Actuators can be classified into three main categories according to their energy source: pneumatic, hydraulic, and electric.

[0003] As a type of actuator, the single-acting double-piston double-fork pneumatic actuator combines high torque output and rapid response in emergency situations through the logic of "air intake in the intermediate chamber drives the double pistons to move outward → double forks work together to drive the rotating shaft to open the valve (spring energy storage)" and "double springs reset after pressure relief → double forks reverse drive the rotating shaft to quickly close the valve". It is an important actuator in the field of industrial safety control.

[0004] Currently, the single-acting double-piston double-fork pneumatic actuator, with a single spring directly between the piston and end cap, has the following disadvantages: the spring is prone to fatigue failure due to long-term unidirectional compression force, affecting the reliability of reset; the force is concentrated on a single spring, which can easily lead to piston tilting, uneven wear on the cylinder wall, and increased air leakage and component wear; the reset force varies greatly with the compression, and excessive force at the initial valve closing stage can easily impact the valve, while insufficient force at the later stage may result in failure to close tightly; the spring installation space is limited, making it difficult to provide a large reset torque and unsuitable for large-diameter valves; and the spring and piston coaxiality requirements are high, and assembly deviations can easily cause jamming, reducing the stability and lifespan of the actuator.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of the prior art and provide an elastic support mechanism for the piston end of a pneumatic actuator, so as to solve the technical problems of easy failure, uneven force, unstable reset, insufficient torque, and easy jamming in the prior art where a spring is directly set between the piston and the end cover.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A piston end elastic support mechanism for a pneumatic actuator includes a cylinder body, in which a piston is disposed and sealed by an end cap disposed at the end of the cylinder body to form a piston movable cavity. A first spring assembly slot is disposed on the outer side wall of the piston, and a second spring assembly slot corresponding to the first spring assembly slot is disposed on the inner wall of the end cap. One end of the spring assembly is inserted into the first spring assembly slot, and the other end is inserted into the second spring assembly slot.

[0009] Furthermore, the spring assembly includes four springs arranged in parallel to each other, with one end of each spring sleeved on a first guide sleeve and the other end sleeved on a second guide sleeve. The first guide sleeve and the second guide sleeve are respectively movably sleeved on both ends of the same guide rod.

[0010] Furthermore, the first guide sleeve is T-shaped and includes a first guide sleeve seat and a first guide sleeve rod connected to each other, as well as a first guide rod through hole through which the guide rod passes; the second guide sleeve is T-shaped and includes a second guide sleeve seat and a second guide sleeve rod connected to each other, as well as a second guide rod through hole through which the guide rod passes.

[0011] Furthermore, the spring is a flat spring.

[0012] Furthermore, a circular piston groove is formed on the outer side wall of the piston, and the first spring assembly slot is provided in the piston groove.

[0013] Furthermore, the first spring assembly slot includes four first spring slots symmetrically arranged around the center of the piston groove for insertion of the first guide sleeve and the end of the spring; the outer side of each first spring slot is connected to the inner wall of the piston groove, and the sides of adjacent first spring slots are connected by a first reinforcing rib.

[0014] Furthermore, the bottom wall of the first spring slot is also provided with a first bottom wall guide groove for the guide rod to be inserted.

[0015] Furthermore, the end cap includes a circular end cap cavity with an opening facing the piston, and a second spring assembly slot is provided within the end cap cavity.

[0016] Furthermore, the second spring assembly slot includes four second spring slots symmetrically arranged around the center of the end cap cavity for insertion of the second guide sleeve and the end of the spring; the outer side of each second spring slot is connected to the inner wall of the end cap cavity, and the sides of adjacent second spring slots are connected by a second reinforcing rib.

[0017] Furthermore, the bottom wall of the second spring slot is also provided with a second bottom wall guide groove into which the guide rod can be inserted.

[0018] This utility model provides an elastic support mechanism for the piston end of a pneumatic actuator. By providing a first spring assembly slot on the outside of the piston and a second spring assembly slot on the inner wall of the end cap, the two ends of the spring assembly are connected, ensuring stable operation of the spring assembly within the piston's moving chamber. This mechanism has a simple component structure and effectively solves the technical problems of existing technologies where a single spring is directly placed between the piston and end cap, such as easy spring failure, uneven force distribution, unstable reset, insufficient torque, and easy jamming. It provides a guarantee for the stable operation of the actuator and effectively extends its service life. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the piston end elastic support mechanism for a pneumatic actuator described in this utility model applied to the actuator;

[0020] Figure 2 This is an assembly diagram of an elastic support mechanism for the piston end of a pneumatic actuator according to the present invention.

[0021] Figure 3 This is a first-view schematic diagram of the connection between the spring assembly, guide rod, and guide sleeve in the piston end elastic support mechanism for a pneumatic actuator according to the present invention.

[0022] Figure 4 This is a second-view schematic diagram of the connection between the spring assembly, guide rod, and guide sleeve in the piston end elastic support mechanism for a pneumatic actuator according to the present invention.

[0023] Figure 5 This is a schematic diagram of the spring structure in the piston end elastic support mechanism for a pneumatic actuator described in this utility model;

[0024] Figure 6 This is a schematic diagram showing the connection of the guide rod and guide sleeve in the piston end elastic support mechanism for a pneumatic actuator described in this utility model;

[0025] Figure 7 This is a schematic diagram of the piston with a first spring assembly slot in the piston end elastic support mechanism for a pneumatic actuator according to the present invention.

[0026] Figure 8 This is a schematic diagram of the end cap with a second spring assembly slot in the piston end elastic support mechanism for a pneumatic actuator according to the present invention.

[0027] Illustration markings:

[0028] 1-Cylinder block;

[0029] 2-Piston, 201-Piston groove;

[0030] 3-First spring assembly slot, 301-First spring slot, 302-First reinforcing rib, 303-First bottom wall guide groove;

[0031] 4-Piston moving chamber;

[0032] 5-End cap, 501-End cap cavity;

[0033] 6-Second spring assembly slot, 601-Second spring slot, 602-Second reinforcing rib, 603-Second bottom wall guide groove;

[0034] 7-Spring assembly, 701-Spring, 702-First guide sleeve, 703-Second guide sleeve, 704-First guide sleeve seat, 705-First guide sleeve rod, 706-First guide rod through hole, 707-Second guide sleeve seat, 708-Second guide sleeve rod, 709-Second guide rod through hole;

[0035] 8-Guide rod;

[0036] 9-Shift fork. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the figures and embodiments.

[0038] like Figure 1 and 2 As shown, a piston end elastic support mechanism for a pneumatic actuator includes a cylinder body 1, a piston 2 disposed inside the cylinder body 1, and a piston movable cavity 4 formed by sealing the piston 2 with an end cap 5 at the end of the cylinder body 1; a fork 9 is connected to the inner side of the piston 2; the piston 2 has a first spring assembly slot 3 on its outer side wall, and a second spring assembly slot 6 corresponding to the first spring assembly slot 3 on the inner wall of the end cap 5; one end of a spring assembly 7 is inserted into the first spring assembly slot 3, and the other end is inserted into the second spring assembly slot 6, thereby achieving elastic support for the piston 2.

[0039] like Figures 3-6 As shown, the spring assembly 7 in this embodiment includes four springs 701 arranged in parallel with each other. One end of each spring 701 is sleeved on the first guide sleeve 702 and the other end is sleeved on the second guide sleeve 703. The first guide sleeve 702 and the second guide sleeve 703 are respectively movably sleeved on both ends of the same guide rod 8.

[0040] The first guide sleeve 702 is T-shaped and includes a first guide sleeve seat 704 and a first guide sleeve rod 705 connected to each other, as well as a first guide rod through hole 706 through which the guide rod 8 can pass.

[0041] The second guide sleeve 703 is T-shaped and includes a second guide sleeve seat 707 and a second guide sleeve rod 708 connected to each other, as well as a second guide rod through hole 709 through which the guide rod 8 can pass.

[0042] In this embodiment, one end of the spring 701 is fitted with the first guide sleeve 705 and is limited and supported by the first guide sleeve seat 704; the other end of the spring 701 is fitted with the second guide sleeve 708 and is limited and supported by the second guide sleeve seat 707.

[0043] The guide rod 8 passes through the first guide rod through hole 706 and the second guide rod through hole 709 respectively, and is used to guide the spring 701 during extension and retraction to ensure that the force on a single spring 701 is uniform, the reset is stable, and there is no displacement.

[0044] It should be noted that the spring 701 described in this embodiment is a flat spring.

[0045] Specifically, a flat spring is made by winding a flat metal strip into a spiral shape with gaps between adjacent coils. Its cross-section is rectangular, unlike a circular cross-section spring. This structure allows for a more reasonable stress distribution when the spring is axially compressed, and its compact shape allows it to be arranged in a limited space.

[0046] Its use in actuators has the following advantages:

[0047] Stress and lifespan: The flat cross-section makes the spring more evenly stressed. Compared with the round cross-section spring, it has better fatigue resistance. When subjected to unidirectional force for a long time, it is not easy to fail quickly due to stress concentration, thus improving the reliability and lifespan of the actuator reset.

[0048] Reset characteristics: The reset force changes relatively smoothly with the amount of compression. When closing the valve, the initial impact force is small, and there is a stable force in the later stage, which can avoid valve impact and incomplete closing, making the actuator move more smoothly.

[0049] Space and Torque: The compact structure is adapted to the limited space of the actuator, allowing for the design of larger wire diameters and turns, providing greater reset torque in small installation spaces, meeting the needs of large-diameter valves, and broadening the application scenarios of the actuator.

[0050] Coaxiality and stability: During installation, the coaxiality of the flat spring and the piston is easily guaranteed, and it is not easy to get stuck due to assembly deviation, which improves the operating stability of the actuator, reduces component wear, and ensures long-term reliable operation.

[0051] In this embodiment, the length of the guide rod 8 is greater than the length of the spring 701 in its contracted state and less than the length of the spring 701 in its extended state. This ensures that the spring 701 can achieve stable extension and retraction within the piston's movable chamber 4 under the action of air pressure and spring return force.

[0052] like Figure 2 and 7 As shown, a circular piston groove 201 is provided on the outer side wall of the piston 2, and the first spring assembly slot 3 is provided in the piston groove 201.

[0053] Specifically, the first spring assembly slot 3 includes four first spring slots 301 symmetrically arranged around the center of the piston groove 201 for insertion of the first guide sleeve 702 and the end of the spring 701; the outer side of each first spring slot 301 is connected to the inner wall of the piston groove 201, and the sides of adjacent first spring slots 301 are connected by a first reinforcing rib 302.

[0054] This embodiment forms a stable first spring assembly slot 3 by providing four first spring slots 301 in the piston groove 201, ensuring that the outer wall of each first spring slot 301 is in contact with and connected to the inner wall of the piston groove 201, and that the sides of adjacent first spring slots 301 are connected by first reinforcing ribs 302, thereby ensuring stability during operation.

[0055] In addition, a first bottom wall guide groove 303 is provided on the bottom wall of the first spring slot 301 for the guide rod 8 to be inserted. The first bottom wall guide groove 303 is located at the axial position of the bottom wall of the first spring slot 301. The outer diameter of the first bottom wall guide groove 303 is not less than the outer diameter of the guide rod 8, and the outer diameter of the first bottom wall guide groove 303 is less than the outer diameter of the first guide sleeve 704. It is used to provide space for the guide rod 8 to be stored when the spring 701 is contracted, so as to facilitate the extension and retraction control of the spring 701.

[0056] like Figure 2 and 8 As shown, the end cap 5 includes a circular end cap cavity 501 with an opening facing the piston 2, and the second spring assembly slot 6 is provided in the end cap cavity 501.

[0057] Specifically, the second spring assembly slot 6 includes four second spring slots 601 symmetrically arranged around the center of the end cap cavity 501 for insertion of the second guide sleeve 703 and the end of the spring 701; the outer side of each second spring slot 601 is connected to the inner wall of the end cap cavity 501, and the sides of adjacent second spring slots 601 are connected by a second reinforcing rib 602.

[0058] This embodiment forms a stable second spring assembly slot 6 by providing four second spring slots 601 in the end cap cavity 501, ensuring that the outer wall of each second spring slot 601 is in contact with and connected to the inner wall of the end cap cavity 501, and that the sides of adjacent second spring slots 601 are connected by second reinforcing ribs 602, thereby ensuring stability during operation.

[0059] In addition, the bottom wall of the second spring slot 601 is also provided with a second bottom wall guide groove 603 for the guide rod 8 to be inserted. The second bottom wall guide groove 603 is located at the axial position of the bottom wall of the second spring slot 601. The outer diameter of the second bottom wall guide groove 603 is not less than the outer diameter of the guide rod 8, and the outer diameter of the second bottom wall guide groove 603 is less than the outer diameter of the second guide sleeve 707. It is used to provide space for the guide rod 8 to be stored when the spring 701 is contracted, so as to facilitate the extension and retraction control of the spring 701.

[0060] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this utility model are included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A piston end elastic support mechanism for a pneumatic actuator, comprising a cylinder body (1), wherein a piston (2) is disposed within the cylinder body (1), and a piston movable chamber (4) is formed by sealing the piston with an end cap (5) at the end of the cylinder body (1), characterized in that, The piston (2) has a first spring assembly slot (3) on its outer side wall, and the end cap (5) has a second spring assembly slot (6) corresponding to the first spring assembly slot (3) on its inner side wall. One end of the spring assembly (7) is inserted into the first spring assembly slot (3), and the other end is inserted into the second spring assembly slot (6).

2. The piston-end elastic support mechanism for a pneumatic actuator according to claim 1, characterized in that, The spring assembly (7) includes four springs (701) arranged in parallel to each other. One end of each spring (701) is sleeved on the first guide sleeve (702) and the other end is sleeved on the second guide sleeve (703). The first guide sleeve (702) and the second guide sleeve (703) are respectively movably sleeved on both ends of the same guide rod (8).

3. The piston-end elastic support mechanism for a pneumatic actuator according to claim 2, characterized in that, The first guide sleeve (702) is T-shaped and includes a first guide sleeve seat (704) and a first guide sleeve rod (705) connected to each other, as well as a first guide rod through hole (706) through which the guide rod (8) can pass. The second guide sleeve (703) is T-shaped and includes a second guide sleeve seat (707) and a second guide sleeve rod (708) connected to each other, as well as a second guide rod through hole (709) through which the guide rod (8) can pass.

4. The piston-end elastic support mechanism for a pneumatic actuator according to claim 3, characterized in that, The spring (701) is a flat spring.

5. The piston-end elastic support mechanism for a pneumatic actuator according to claim 3, characterized in that, A circular piston groove (201) is provided on the outer side wall of the piston (2), and the first spring assembly slot (3) is provided in the piston groove (201).

6. The piston-end elastic support mechanism for a pneumatic actuator according to claim 5, characterized in that, The first spring assembly slot (3) includes four first spring slots (301) symmetrically arranged around the center of the piston groove (201) for insertion of the first guide sleeve (702) and the end of the spring (701); the outer side of each first spring slot (301) is connected to the inner wall of the piston groove (201), and the sides of adjacent first spring slots (301) are connected by a first reinforcing rib (302).

7. The piston-end elastic support mechanism for a pneumatic actuator according to claim 6, characterized in that, The bottom wall of the first spring slot (301) is also provided with a first bottom wall guide groove (303) into which the guide rod (8) can be inserted.

8. The piston end elastic support mechanism for a pneumatic actuator according to claim 3, characterized in that, The end cap (5) includes a circular end cap cavity (501) with an opening facing the piston (2), and the second spring assembly slot (6) is provided in the end cap cavity (501).

9. The piston-end elastic support mechanism for a pneumatic actuator according to claim 8, characterized in that, The second spring assembly slot (6) includes four second spring slots (601) symmetrically arranged around the center of the end cap cavity (501) for insertion of the end of the second guide sleeve (703) and the spring (701); the outer side of each second spring slot (601) is connected to the inner wall of the end cap cavity (501), and the sides of adjacent second spring slots (601) are connected by a second reinforcing rib (602).

10. A piston-end elastic support mechanism for a pneumatic actuator according to claim 9, characterized in that, The bottom wall of the second spring slot (601) is also provided with a second bottom wall guide groove (603) into which the guide rod (8) can be inserted.

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