Built-in pneumatic actuator buffer structure

Abstract

The utility model discloses a built-in pneumatic actuator buffering structure which comprises a buffering valve element which is installed in an air cylinder end cover and internally of a hollow structure, a buffering elastic piece arranged on the buffering valve element and a buffering pressing plate which is arranged on the air cylinder end cover and installed with the buffering valve element in a matched mode. The buffering valve element corresponds to an air inlet / outlet in the air cylinder end cover, reciprocates along the air cylinder end cover under the action of the thrust of the air cylinder piston and the elastic force of the buffering elastic piece, and is provided with a flow channel structure with a variable section. The exhaust speed is adjusted by changing the sectional area of the variable-section runner structure, and then the speed of the air cylinder piston is adjusted. The buffering structure is built-in, an external additional device is not needed, the air cylinder buffering effect is achieved by reducing the exhaust flow channel through the conical structure, the speed reduction effect is achieved by reducing the exhaust speed of the air cylinder, the problem of violent impact caused by too high speed of an air cylinder piston is avoided, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator technology, specifically to a built-in pneumatic actuator buffer structure. Background Technology

[0002] With the development of the machinery industry, various functional and sophisticated pneumatic control valves are emerging in large numbers, which in turn promotes the vigorous development of the mechanical control industry. However, with the increasing demands for new valves and control requirements, the cost of the corresponding actuator control components will also increase accordingly.

[0003] Depending on the operating conditions, for pneumatic actuators that require end-buffered structures, the conventional buffer structures of large-diameter pneumatic actuators are often complex and large in size; while external valves used for buffering and deceleration often require large-diameter valves in order not to affect the mid-way exhaust speed, and also require corresponding electronic or pneumatic control components, which are costly and not ideal. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a built-in pneumatic actuator buffer structure.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A built-in pneumatic actuator buffer structure, the buffer structure is installed inside the cylinder end cover, the buffer structure includes a buffer valve core installed inside the cylinder end cover and having a hollow internal structure, a buffer elastic element disposed on the buffer valve core, and a buffer pressure plate disposed on the cylinder end cover and installed in cooperation with the buffer valve core. The buffer valve core corresponds to the inlet / exhaust port on the cylinder end cover. Under the action of the thrust of the cylinder piston and the elastic force of the buffer elastic element, the buffer valve core reciprocates along the cylinder end cover.

[0006] The buffer valve core is equipped with a flow channel structure with a variable cross-section. The exhaust speed is adjusted by changing the cross-sectional area of ​​the flow channel structure, thereby adjusting the speed of the cylinder piston.

[0007] Furthermore, the variable cross-section flow channel structure includes a tapered flow channel disposed on the outer wall of the buffer valve core and a venting groove disposed on the end face of the buffer valve core that contacts the cylinder piston. The tapered flow channel and the buffer pressure plate form a gradually narrowing exhaust flow channel.

[0008] Furthermore, the buffer valve core includes a valve core body and a stepped ring disposed on the valve core body. The stepped ring is configured to cooperate with the cylinder end cover, and the valve core body is configured to cooperate with the inner hole of the buffer pressure plate. A tapered flow channel is formed on the outer wall of the valve core body, and a vent groove is formed on the end face of the valve core body that contacts the cylinder piston.

[0009] Furthermore, the diameter of the stepped ring is larger than the diameter of the valve core body.

[0010] Furthermore, the buffer plate is installed on the cylinder end cover by countersunk screws, and cooperates with the buffer valve core to form a two-point support structure.

[0011] Furthermore, the buffer elastic element is a buffer spring.

[0012] The present invention has the following beneficial effects: The built-in pneumatic actuator buffer structure provided by the present invention has a reliable structure and good performance. The buffer structure is built-in and does not require external additional devices. The cylinder buffering effect is achieved by reducing the exhaust flow channel through the conical structure. By reducing the exhaust speed of the cylinder, a deceleration effect is formed, avoiding the problem of severe impact caused by excessive speed of the cylinder piston, extending the service life of the equipment. Moreover, it is simple to control and operate, small in size and light in weight, and saves costs significantly. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the buffer valve core structure of this utility model;

[0015] Figure 3 This is a schematic diagram of a pneumatic actuator.

[0016] Figure 4 This is a schematic diagram of the pneumatic working process of this utility model;

[0017] Figure 5 This is a schematic diagram of the pneumatic return process of this utility model;

[0018] Figure 6 This is a schematic diagram of the pneumatic buffering process of this utility model;

[0019] Figures 1 to 6 The reference numerals in the attached figures are as follows: 1-cylinder end cover, 2-buffer structure, 3-cylinder piston, 4-cylinder barrel, 5-cylinder spring, 6-buffer spring, 7-buffer valve core, 8-countersunk screw, 9-buffer pressure plate; 70-vent groove, 71-conical flow channel, 72-valve core body, 73-step ring. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] like Figures 1 to 3As shown, a built-in pneumatic actuator buffer structure 2 is installed inside the cylinder end cover 1. The cylinder end cover 1 serves as the mounting base for the buffer structure 2, fixed to the upper or lower end of the cylinder, providing support and sealing for the internal components. It integrates components such as the buffer valve core 7 and the buffer spring, making the buffer structure 2 internal and eliminating the need for external auxiliary devices. The cylinder barrel 4, as the main structure of the pneumatic actuator, is the cylindrical outer shell of the cylinder, with the internal cavity for the movement of the cylinder piston 3. The cylinder piston 3 is located inside the cylinder barrel 4. One end of the cylinder spring 5 is fixed inside the cylinder barrel 4, and the other end is connected to the cylinder piston 3. When compressed air pushes the cylinder piston 3 to move, the cylinder spring 5 is compressed; when the air pressure is released, the cylinder spring 5 releases its elastic force, pushing the cylinder piston 3 back to its initial position. During the buffering phase, the cylinder spring 5 works in conjunction with the buffer structure to further reduce the impact of the piston.

[0022] The buffer structure 2 includes a buffer valve core 7 with a hollow interior, installed inside the cylinder end cover 1; a buffer elastic element 6 mounted on the buffer valve core 7; and a buffer pressure plate 9 mounted on the cylinder end cover 1 and cooperating with the buffer valve core 7. The buffer elastic element 6 is a buffer spring that provides a restoring force, allowing the buffer valve core 7 to return to its initial position after the thrust of the cylinder piston 3 is removed. The buffer pressure plate 9 is mounted on the cylinder end cover 1 by countersunk screws 8 and cooperates with the buffer valve core 7 to form a two-point support structure, ensuring the stable movement of the buffer valve core 7. At the same time, the buffer pressure plate 9 restricts the axial displacement of the buffer valve core 7, preventing it from detaching from the cylinder end cover 1.

[0023] The buffer valve core 7 corresponds to the inlet / outlet on the cylinder end cover 1. Under the thrust of the cylinder piston 3 and the elastic force of the buffer elastic element 6, the buffer valve core 7 reciprocates along the cylinder end cover 1. The buffer valve core 7 is equipped with a variable cross-section flow channel structure. The exhaust speed is adjusted by the change of the cross-sectional area of ​​the variable cross-section flow channel structure, thereby adjusting the speed of the cylinder piston 3.

[0024] Specifically, the variable cross-section flow channel structure includes a tapered flow channel 71 disposed on the outer wall of the buffer valve core 7 and a venting groove 70 disposed on the end face of the buffer valve core 7 that contacts the cylinder piston 3. The tapered flow channel 71 and the buffer pressure plate 9 form a gradually narrowing exhaust flow channel, achieving deceleration through changes in cross-sectional area. When the venting groove 70 contacts the cylinder piston 3, it serves as an auxiliary exhaust channel to ensure minimum exhaust volume. During the retraction of the buffer valve core 7, the tapered flow channel 71 reduces the size of the exhaust flow channel to achieve a cylinder buffering effect; by reducing the exhaust speed of the cylinder, a deceleration effect is achieved, avoiding the severe impact problem caused by excessive speed of the cylinder piston 3, and extending the service life of the equipment.

[0025] The buffer valve core 7 includes a valve core body 72 and a stepped ring 73 disposed on the valve core body 72. The diameter of the stepped ring 73 is larger than the diameter of the valve core body 72. The stepped ring 73 is fitted with the cylinder end cover 1, and the valve core body 72 is fitted with the inner hole of the buffer pressure plate 9. As the core part of the buffer valve core 7, the valve core body 72 carries the tapered flow channel 71 and the venting groove 70, and is responsible for adjusting the exhaust flow channel area. Specifically, the tapered flow channel 71 is formed on the outer wall of the valve core body 72, and the venting groove 70 is formed on the end face of the valve core body 72 that contacts the cylinder piston 3.

[0026] The diameter of the stepped ring 73 is larger than that of the valve core body 72. It fits with the inner wall of the cylinder end cover 1 to form the first support point, ensuring the axial movement stability of the buffer valve core 7. The valve core body 72 fits with the inner hole of the buffer pressure plate 9 to form the second support point. Together with the stepped ring 73, they form a "two-point support structure" to improve stability.

[0027] like Figures 4 to 6 As shown, high-pressure air enters the buffer valve core 7 through the inlet / outlet ports and then enters the cylinder through the vent groove 70 of the buffer valve core 7. Specifically, after the compressed air enters the cylinder, it pushes the cylinder piston 3 to move within the cylinder barrel 4 and compresses the cylinder spring 5. Simultaneously, as the cylinder piston 3 rises, the buffer valve core 7 in the buffer structure 2 moves upward synchronously under the action of the buffer spring 6. When the buffer valve core 7 disengages from the cylinder piston, the cylinder piston continues to move under the action of the compressed air.

[0028] When the intake / exhaust port stops supplying high-pressure air to the cylinder and exhausts air, the cylinder piston 3 returns to its original position under the buffer spring, and the air in the cylinder is discharged through the buffer structure 22. Specifically, during the return operation, the air in the cylinder is discharged through the buffer structure 22. When the lower end face of the cylinder piston 3 contacts the upper end face of the buffer valve core 7, the air in the cylinder can only be discharged from the vent groove 70 and the tapered flow channel 71 of the buffer valve core 7.

[0029] As the cylinder piston 3 pushes the buffer valve core 7 down, the conical flow channel 71 on the buffer valve core 7 intersects with the buffer pressure plate 9, making the exhaust area of ​​the conical flow channel 71 smaller, until the conical flow channel 71 is completely hidden in the buffer pressure plate 9. At this point, the exhaust area is at its minimum, and only the area of ​​the vent groove 70 is available for exhaust. During the exhaust process, as the exhaust area of ​​the conical flow channel 71 on the buffer valve core 7 gradually decreases, the cylinder exhaust speed gradually decreases, thereby achieving deceleration control of the cylinder.

[0030] The work steps are as follows:

[0031] (1) Buffering phase:

[0032] When the cylinder piston 3 approaches the end of its stroke, it pushes the buffer valve core 7 to move into the cylinder end cover 1, compressing the buffer spring.

[0033] As the buffer valve core 7 retracts, its external tapered flow channel 71 is gradually blocked by the buffer pressure plate 9, and the cross-sectional area of ​​the exhaust flow channel gradually decreases.

[0034] The reduction in the cross-sectional area of ​​the flow channel leads to a decrease in exhaust velocity and a drop in cylinder pressure, thereby slowing down the piston movement and achieving a buffering effect.

[0035] (2) Exhaust stage

[0036] If the gas supply is cut off when the cylinder piston 3 returns, the remaining gas in the cylinder needs to be discharged through the buffer structure 2.

[0037] At this time, the buffer valve core 7 is reset under the elastic force of the buffer spring, the conical flow channel 71 gradually opens, the cross-sectional area of ​​the exhaust flow channel increases, and the exhaust speed returns to the normal level.

[0038] Before the buffer valve core 7 is fully reset, the vent groove 70 serves as an auxiliary channel to maintain a minimum exhaust volume, thus preventing the piston from impacting due to complete blockage of airflow.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A built-in pneumatic actuator cushioning structure, characterized by, The buffer structure (2) is installed in the cylinder end cover (1), the buffer structure (2) comprises a buffer valve core (7) installed in the cylinder end cover (1) and having a hollow structure inside, a buffer elastic element (6) arranged on the buffer valve core (7), and a buffer pressing plate (9) arranged on the cylinder end cover (1) and matched with the buffer valve core (7), the buffer valve core (7) corresponds to the inlet / outlet of the cylinder end cover (1), and the buffer valve core (7) reciprocates along the cylinder end cover (1) under the thrust of the cylinder piston (3) and the elastic force of the buffer elastic element (6). The buffer valve core (7) is provided with a variable cross-section flow channel structure, and the exhaust speed is adjusted by changing the cross-sectional area of the variable cross-section flow channel structure, so as to adjust the speed of the cylinder piston (3).

2. The built-in pneumatic actuator cushioning structure according to claim 1, wherein, The variable cross-section flow channel structure comprises a tapered flow channel (71) arranged on the outer wall of the buffer valve core (7) and an air passage (70) arranged on the end surface of the buffer valve core (7) in contact with the cylinder piston (3), and the tapered flow channel (71) and the buffer pressing plate (9) form a tapered exhaust flow channel.

3. The built-in pneumatic actuator cushioning structure of claim 1, wherein, The buffer valve core (7) comprises a valve core body (72) and a stepped ring (73) arranged on the valve core body (72), the stepped ring (73) is matched with the cylinder end cover (1), and the valve core body (72) is matched with the inner hole of the buffer pressing plate (9).

4. The built-in pneumatic actuator cushioning structure of claim 3, wherein, The diameter of the stepped ring (73) is greater than the diameter of the valve core body (72).

5. The in-line pneumatic actuator cushioning structure of claim 1, wherein, The buffer pressing plate (9) is installed on the cylinder end cover (1) by means of a countersunk screw (8) and matched with the buffer valve core (7) to form a two-point support structure.

6. The built-in pneumatic actuator cushioning structure according to any one of claims 1 to 5, characterized in that, The buffer elastic element (6) is a buffer spring.

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