Small-size and quick-response pneumatic actuating mechanism

Abstract

The invention discloses a small-size and quick-response pneumatic actuating mechanism, which relates to the technical field of pneumatic actuating mechanisms, and comprises a cylinder body, a first end cover, a driving box body, a second end cover, a third end cover, a first piston, a first spring, a plurality of pneumatic driving mechanisms, a push rod and a connecting rod mechanism, the outer edge of the first end of the inner cylinder is integrally connected with the first end of the outer cylinder, and the first piston is slidably connected into the first piston movement cavity. The first spring sleeves the annular cavity; the pneumatic driving mechanisms are sequentially connected in series in the second piston movement cavity; one end of the push rod penetrates through the second end cover and is fixedly connected with the output end of each pneumatic driving mechanism, and the other end of the push rod penetrates through the first end cover and extends into the driving box body; the pneumatic actuating mechanism has the advantages that the structure is simple, the size and the weight of the pneumatic actuating mechanism are effectively reduced, and the response speed is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic actuators, and in particular to a small-volume and fast-response pneumatic actuator. Background Art

[0002] Pneumatic actuators use compressed air as their power source and have the characteristics of simple structure, fast response, good explosion-proof performance, and low maintenance cost. They are widely used in industrial fields such as petrochemical, electric power, and metallurgy. However, the existing technology has the following problems:

[0003] Slow response: Due to the characteristics of compressed air transmission and system inertia, there is a delay in the transmission of air pressure signals in the pipeline. Especially in long-distance air supply or large-volume cylinder applications, the filling and deflation process takes longer, making it difficult for the actuator to meet high-precision and high-frequency control requirements.

[0004] Bulky Structure: To achieve long strokes, traditional pneumatic actuators often require large cylinders and extra-long return springs, resulting in a bulky and heavy overall structure. This not only takes up a large amount of equipment layout space but also may affect the layout of surrounding components. Long springs are also prone to fatigue failure, increasing maintenance costs and space requirements. Summary of the Invention

[0005] The purpose of the present invention is to provide a small-volume and fast-response pneumatic actuator to solve the problems existing in the above-mentioned prior art. It has a simple structure, effectively reduces the volume and weight of the pneumatic actuator, and effectively increases the response speed.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a pneumatic actuator with a small volume and fast response, comprising: a cylinder body, a first end cover, a drive housing, a second end cover, a third end cover, a first piston, a first spring, a plurality of pneumatic drive mechanisms, a push rod and a connecting rod mechanism. The cylinder body comprises an outer cylinder and an inner cylinder, the inner cylinder having a first end and a second end which are arranged opposite to and connected to each other, the outer cylinder having a first end and a second end which are arranged opposite to and connected to each other, the inner cylinder being sleeved in the outer cylinder, the outer edge of the first end of the inner cylinder and the first end of the outer cylinder being integrally connected, an annular cavity being provided between the inner cylinder and the outer cylinder, a first piston movement cavity being provided in a portion of the outer cylinder which is not sleeved with the inner cylinder, and a second piston movement cavity being provided in the inner cylinder; the first end cover is tightly connected to the first end of the outer cylinder; the drive housing is fixedly connected to the first end cover; the second end cover is tightly connected to the second end of the inner cylinder; the third end cover is tightly connected to the first end of the inner cavity Tight connection; the first piston is slidably connected to the first piston movement chamber and the outer edge of the first piston is slidably and sealedly connected to the inner wall of the outer cylinder; the first spring is sleeved on the annular chamber, and one end of the first spring is detachably connected to the first piston, and the other end is detachably connected to the second end of the outer cylinder; each of the pneumatic drive mechanisms is sequentially connected in series in the second piston movement chamber; the push rod passes through the first piston and is fixedly connected to the first piston, one end of the push rod passes through the second end cover and is fixedly connected to the output end of each pneumatic drive mechanism, and the push rod is sealingly and slidingly connected to the second end cover, the other end of the push rod passes through the first end cover and extends into the drive box body, and the push rod is slidably connected to the first end cover; one end of the connecting rod mechanism is transmission connected to one end of the push rod extending into the drive box body, and the other end is fixedly connected to the output shaft of the drive box body.

[0008] Preferably, an air intake and exhaust pipe is provided in the side wall of the inner cylinder, and a plurality of air intake and exhaust ports connecting the second piston movement chamber and the air intake and exhaust pipe are provided on the side wall of the inner cylinder. The air intake and exhaust ports are arranged in sequence along the length direction of the inner cylinder, and one end of the air intake and exhaust pipe extends out of the inner cylinder and is connected to the air source mechanism, and the air intake and exhaust ports are arranged corresponding to the pneumatic drive mechanism.

[0009] Preferably, the pneumatic drive mechanism includes a fixed spring seat, a plurality of second springs and a second piston, the fixed spring seat is sealed and fixedly connected to the inner cylinder, the second piston is slidably connected to the second piston movement chamber and the outer edge of the second piston is slidably and sealedly connected to the inner wall of the inner cylinder, one end of the second spring is detachably fixedly connected to the fixed spring seat, and the other end is detachably fixedly connected to the second piston, and the air intake and exhaust ports are arranged between the fixed spring seat and the adjacent second piston and close to the fixed spring seat.

[0010] Preferably, each of the second springs is evenly arranged between the fixed spring seat and the second piston.

[0011] Preferably, it further includes a plurality of third springs and a third piston, wherein the third piston is slidably connected to the second piston movement chamber and the outer edge of the second piston is slidably and sealingly connected to the inner wall of the inner cylinder, the third piston is detachably connected to the push rod, one end of the third spring is detachably connected to the third end cover, and the other end is detachably connected to the third piston.

[0012] Preferably, it also includes multiple piston guide shafts, one end of the piston guide shaft is detachably connected to the third end cover, and the other end is detachably connected to the second end cover, and the piston guide shaft passes through and sealingly slides to connect each second piston, each fixed spring seat and the third piston.

[0013] Preferably, it also includes a first limiting bolt, the first end cover is provided with a first threaded hole, the first limiting screw is threadedly connected to the first threaded hole, and one end of the first limiting screw extends into the first piston movement cavity to abut against the first piston to adjust the sliding stroke of the first piston.

[0014] Preferably, the connecting rod mechanism includes a ball head connecting rod, a guide slider, a transmission pin, a slider guide shaft and a crank, one end of the ball head connecting rod is fixedly connected to one end of the push rod extending into the drive box, and the other end is transmission connected to the guide slider, the crank is transmission connected to the guide slider through the transmission pin, the slider guide shaft is fixedly connected to the drive box and arranged parallel to the push rod, the guide slider is sleeved on the outside of the slider guide shaft, and the slider guide shaft can guide the moving direction of the guide slider, and the crank is fixedly connected to the output shaft of the drive box.

[0015] Preferably, it also includes a second limiting bolt and a third limiting bolt, and the drive box body is provided with a second threaded hole and a third threaded hole, the second limiting bolt is threadedly connected to the second threaded hole, and the third limiting bolt is threadedly connected to the third threaded hole, and one end of the second limiting bolt extends into the drive box body for abutting against the crank to limit the clockwise rotation angle of the crank, and one end of the third limiting bolt extends into the drive box body for abutting against the crank to limit the counterclockwise rotation angle of the crank.

[0016] Preferably, it also includes a gas storage tank, a control valve and a gas delivery pipe, one end of the gas delivery pipe is connected to the gas storage tank, and the other end is connected to the air intake and exhaust pipes, and the control valve is installed on the gas delivery pipe.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention provides a small-volume and fast-response pneumatic actuator. The nesting of the outer cylinder and the inner cylinder and the arrangement of different cavities provide reasonable installation space for various components and optimize the overall layout. The cylinder and the piston cylinder are integrated into a cylinder body, effectively reducing the overall size of the actuator.

[0019] Furthermore, by arranging a plurality of pneumatic drive mechanisms and cooperating with the first spring, the response speed is effectively improved;

[0020] Furthermore, a connecting rod mechanism replaces the traditional piston-type shift fork mechanism, optimizing the conversion process from piston linear motion to shift fork rotation. This design effectively reduces the size and weight of the piston cylinder, improves system accuracy and stability, reduces energy consumption and complexity, reduces noise, and extends equipment life. Furthermore, the connecting rod mechanism offers greater installation precision and ease of maintenance, better adapting to complex and changing control requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a small-volume and fast-response pneumatic actuator provided by the present invention;

[0023] In the figure: 1. Air storage tank; 2. Outer cylinder; 3. Inner cylinder; 4. First spring; 5. O-ring; 6. First end cover; 7. First limit bolt; 8. Slider guide shaft; 9. Drive housing; 10. Crank; 11. Second limit bolt; 12. Transmission pin; 13. Guide slider; 14. Ball head connecting rod; 15. Third limit bolt; 16. First piston; 17. Second end cover; 18. Push rod; 19. Piston guide shaft; 20. D-ring; 21. Second piston; 22. Second spring; 23. Fixed spring seat; 25. Third spring; 26. Third piston; 27. Third end cover; 28. Intake and exhaust ports; 29. ​​Control valve. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a small-volume and fast-response pneumatic actuator to solve the problems existing in the above-mentioned prior art. It has a simple structure, effectively reduces the volume and weight of the pneumatic actuator, and effectively increases the response speed.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a small-volume and fast-response pneumatic actuator, such as Figure 1As shown, it includes: a cylinder body, a first end cover 6, a drive box body 9, a second end cover 17, a third end cover 27, a first piston 16, a first spring 4, a plurality of pneumatic drive mechanisms, a push rod 18 and a connecting rod mechanism. The cylinder body includes an outer cylinder 3 and an inner cylinder. The inner cylinder has a first end and a second end that are relatively arranged and connected. The outer cylinder 3 has a first end and a second end that are relatively arranged and connected. The inner cylinder is sleeved in the outer cylinder 3. The outer edge of the first end of the inner cylinder is integrally connected to the first end of the outer cylinder 3. An annular cavity is provided between the inner cylinder and the outer cylinder 3. The part of the outer cylinder 3 that is not sleeved with the inner cylinder is provided with a first piston 16 movement cavity, and the inner cylinder is provided with a second piston 21 movement cavity; the first end cover 6 is tightly connected to the first end of the outer cylinder 3; the drive box body 9 is fixedly connected to the first end cover 6; the second end cover 17 is tightly connected to the second end of the inner cylinder; the third end cover 27 is tightly connected to the first end of the inner cavity; the first piston 16 is slidably connected to the first piston 16 movement cavity and the outer edge of the first piston 16 is connected to the inner wall of the outer cylinder 3 Sliding sealed connection; the first spring 4 is sleeved in the annular cavity, and one end of the first spring 4 is detachably connected to the first piston 16, and the other end is detachably connected to the second end of the outer cylinder 3; each pneumatic drive mechanism is connected in series in the motion cavity of the second piston 21 in sequence; the push rod 18 passes through the first piston 16 and is fixedly connected to the first piston 16, one end of the push rod 18 passes through the second end cover 17 and is fixedly connected to the output end of each pneumatic drive mechanism, and the push rod 18 is sealed and slidingly connected to the second end cover 17, the other end of the push rod 18 passes through the first end cover 6 and extends into the drive box body 9, and the push rod 18 is slidingly connected to the first end cover 6; one end of the connecting rod mechanism is transmission-connected to one end of the push rod 18 extending into the drive box body 9, and the other end is fixedly connected to the output shaft of the drive box body 9. This complex but carefully designed cylinder structure, including the nesting of the outer cylinder 3 and the inner cylinder and the setting of different cavities, provides a reasonable installation space for each component, optimizes the overall layout, and helps to achieve the goal of small volume design. The tight connection and sealed sliding connection of each component ensures the stability and sealing of the mechanism, helps prevent gas leakage, and improves the overall performance of the mechanism. The coordinated arrangement of these components provides the basic conditions for realizing various actions of the actuator, such as the sliding of the first piston 16 in the first piston 16 movement chamber and the operation of the pneumatic drive mechanism in the second piston 21 movement chamber, enabling the entire actuator to achieve stable and efficient operation.

[0028] In a preferred embodiment, an air intake and exhaust duct is disposed within the sidewall of the inner cylinder. Multiple air intake and exhaust ports 28 are provided on the sidewall of the inner cylinder, connecting the motion chamber of the second piston 21 and the air intake and exhaust duct. Each air intake and exhaust port 28 is sequentially arranged along the length of the inner cylinder. One end of the air intake and exhaust duct extending from the inner cylinder is connected to an air source mechanism. The air intake and exhaust ports 28 are positioned correspondingly to the pneumatic drive mechanisms. The arrangement of the air intake and exhaust duct and the corresponding air intake and exhaust ports 28 provides a stable and smooth air source for the pneumatic drive mechanisms, enabling precise air supply and exhaust to each pneumatic drive mechanism. The sequential arrangement of the air intake and exhaust ports 28 along the length of the inner cylinder, corresponding to the pneumatic drive mechanisms, facilitates separate control of pneumatic drive mechanisms at different locations, improves control accuracy and flexibility, and enables flexible adjustment of the operating state of each pneumatic drive mechanism according to actual operational requirements. The connection with the air source mechanism ensures a continuous supply of power to the entire actuator, ensuring stable and reliable operation of the actuator.

[0029] In a preferred embodiment, the pneumatic drive mechanism includes a fixed spring seat 23, multiple second springs 22, and a second piston 21. The fixed spring seat 23 is sealed and fixedly connected within the inner cylinder. The second piston 21 is slidably connected within the second piston 21's motion chamber, and the outer edge of the second piston 21 is slidably and sealedly connected to the inner wall of the inner cylinder. One end of the second spring 22 is detachably fixedly connected to the fixed spring seat 23, and the other end is detachably fixedly connected to the second piston 21. The air inlet and outlet ports 28 are located between the fixed spring seat 23 and the adjacent second piston 21, and are proximate to the fixed spring seat 23. The sealed and fixed fixed spring seat 23 provides a stable support structure for the second springs 22 and the second piston 21, ensuring the stability of the pneumatic drive mechanism during operation. The sealed sliding connection of the second piston 21 within the second piston 21's motion chamber ensures gas sealing and improves energy efficiency, while also ensuring smooth piston movement. The provision of multiple second springs 22 provides a more stable driving force and cushioning effect, making the movement of the second piston 21 more stable and precise. The intake and exhaust ports 28 are arranged between the fixed spring seat 23 and the adjacent second piston 21 and close to the fixed spring seat 23, which is beneficial to improving the efficiency of intake and exhaust, can quickly push the second piston 21 to move or reset it, and enhance the response speed of the actuator.

[0030] In a preferred embodiment, the second springs 22 are evenly spaced between the fixed spring seat 23 and the second piston 21. This even placement of the second springs 22 results in a more uniform distribution of force acting on the second piston 21, effectively preventing eccentricity or jamming of the piston due to uneven force, and improving the smoothness of the piston's motion. This helps improve the operating accuracy and stability of the entire actuator, ensuring that the actuator can accurately complete various movements, reducing errors and failures caused by unstable piston motion, and further enhancing the reliability and durability of the actuator.

[0031] In a preferred embodiment, multiple third springs and a third piston 26 are further included. The third piston 26 is slidably connected to the motion chamber of the second piston 21, and the outer edge of the second piston 21 is slidably and sealingly connected to the inner wall of the inner cylinder. The third piston 26 is detachably connected to the push rod 18. One end of the third spring is detachably connected to the third end cap 27, and the other end is detachably connected to the third piston 26. The multiple third springs and the third piston 26 that cooperate with them increase the flexibility and reliability of the actuator. The sliding of the third piston 26 within the motion chamber of the second piston 21 and its detachable connection to the push rod 18 enable the movement of the push rod 18 to be assisted and regulated by the third piston 26 and the third spring. The third spring can provide additional cushioning and reset functions. When the actuator is subjected to external impact or requires rapid reset, the third spring can effectively cushion and push the third piston 26 and push rod 18 back to their initial positions, improving the overall performance and anti-interference capabilities of the actuator and extending its service life.

[0032] In a preferred embodiment, it also includes multiple piston guide shafts 19, one end of the piston guide shaft 19 is detachably connected to the third end cover 27, and the other end is detachably connected to the second end cover 17. The piston guide shaft 19 passes through and seals and slides to connect each second piston 21, each fixed spring seat 23 and the third piston 26. The setting of the piston guide shaft 19 provides a guide for each piston (the second piston 21 and the third piston 26), so that they can maintain an accurate position and direction during movement, effectively preventing the piston from offsetting, shaking or getting stuck during movement, and greatly improving the stability and reliability of the actuator. The design of the detachable connection facilitates the assembly, disassembly and maintenance of the equipment, reducing the difficulty and cost of maintenance. The sealed sliding connection not only ensures the smooth movement of each component, but also further enhances the sealing of the entire actuator, reduces the possibility of gas leakage, and improves energy efficiency.

[0033] In a preferred embodiment, it also includes a first limiting bolt 7, the first end cover 6 is provided with a first threaded hole, the first limiting screw is threadedly connected to the first threaded hole, and one end of the first limiting screw extends into the motion chamber of the first piston 16 to abut against the first piston 16 to adjust the sliding stroke of the first piston 16. The provision of the first limiting bolt 7 allows the sliding stroke of the first piston 16 to be flexibly adjusted according to different working requirements, thereby increasing the versatility and adaptability of the actuator, enabling it to meet diverse working requirements under different working conditions. By adjusting the stroke of the first piston 16, the output position or movement amplitude of the actuator can be precisely controlled, thereby improving the control accuracy of the actuator. The threaded connection method is not only convenient to install and disassemble, but also the adjustment process is relatively simple and precise, allowing operators to easily make adjustments according to actual needs, reducing the difficulty of operation and improving work efficiency.

[0034] In a preferred embodiment, it also includes an O-ring 5 and multiple D-rings 20. A first mounting groove is provided on the outer periphery of the first piston 16, and the O-ring 5 is installed in the first mounting groove. One end of the O-ring 5 extending out of the first mounting groove is pressed against the inner wall of the outer cylinder 3. A second mounting groove is provided on the outer periphery of the second piston 21, and the D-ring 20 is installed in the second mounting groove. One end of the D-ring 20 extending out of the second mounting groove is pressed against the inner wall of the inner cylinder. The O-ring is installed in the first mounting groove on the outer periphery of the first piston 16 and presses against the inner wall of the outer cylinder 3, which can form a good seal between the first piston 16 and the outer cylinder 3, effectively preventing fluid (such as compressed air) from leaking in the gap between the two, ensuring the sealing of the moving chamber of the first piston 16, and improving the operating efficiency and energy utilization of the actuator. Multiple D-rings are installed in the second mounting grooves on the outer periphery of the second piston 21 and press against the inner wall of the inner cylinder, providing a reliable seal between the second piston 21 and the inner cylinder. This prevents gas leakage within the second piston 21's motion chamber, ensuring stable operating pressures in the pneumatic drive mechanisms and, in turn, the precision and reliability of the entire actuator, enhancing its overall performance and operational stability. This sealing design ensures that the actuator maintains a good seal and normal operation under varying operating pressures and conditions, improving the product's applicability and durability.

[0035] In a preferred embodiment, the connecting rod mechanism includes a ball-end connecting rod 14, a guide slider 13, a transmission pin 12, a slider guide shaft 8, and a crank 10. One end of the ball-end connecting rod 14 is fixedly connected to one end of the push rod 18 extending into the drive housing 9, and the other end is transmission-connected to the guide slider 13. The crank 10 is transmission-connected to the guide slider 13 via the transmission pin 12. The slider guide shaft 8 is fixedly connected to the drive housing 9 and arranged parallel to the push rod 18. The guide slider 13 is sleeved on the outside of the slider guide shaft 8, and the slider guide shaft 8 is capable of guiding the movement direction of the guide slider 13. The crank 10 is fixedly connected to the output shaft of the drive housing 9. The structural design of this connecting rod mechanism enables the linear motion of the push rod 18 to be effectively converted into the rotational motion of the crank 10, realizing the conversion of motion forms and broadening the application scenarios of the actuator. The coordination of the ball-end connecting rod 14, the guide slider 13, the transmission pin 12, and other components ensures the accuracy and stability of power transmission. Slider guide shaft 8 provides precise guidance for guide slider 13, ensuring it moves in the intended direction, making the entire linkage mechanism operate more smoothly and reliably. This transmission structure effectively transmits the force generated by push rod 18 to the output shaft of drive housing 9, enabling the actuator to drive external devices. It offers high levels of smoothness and reliability, adapting to a variety of operating environments and requirements.

[0036] In a preferred embodiment, a second limiting bolt 11 and a third limiting bolt 15 are further included. The drive housing 9 is provided with a second threaded hole and a third threaded hole. The second limiting bolt 11 is threadedly connected to the second threaded hole, and the third limiting bolt 15 is threadedly connected to the third threaded hole. The second limiting bolt 11 extends into the drive housing 9 at one end to abut against the crank 10 to limit the clockwise rotation angle of the crank 10, and the third limiting bolt 15 extends into the drive housing 9 at one end to abut against the crank 10 to limit the counterclockwise rotation angle of the crank 10. The arrangement of the second limiting bolt 11 and the third limiting bolt 15 can accurately limit the rotation angle of the crank 10, thereby further precisely controlling the output motion range and angle of the actuator. This is particularly important for work scenarios that require control of the motion angle accuracy, greatly improving the control accuracy of the actuator. By adjusting these two limiting bolts, the actuator can be adapted to the crank 10 rotation angle requirements of different work tasks, increasing the versatility and applicability of the actuator. The threaded connection method makes the adjustment operation simple and convenient. The staff can quickly adjust the limit bolt according to actual needs to achieve flexible control of the rotation angle of the crank 10.

[0037] In a preferred embodiment, it also includes a gas tank 1, a control valve 2 and a gas delivery pipe. One end of the gas delivery pipe is connected to the gas tank 1, and the other end is connected to the air intake and exhaust pipes. The control valve 2 is installed on the gas delivery pipe. The setting of the gas tank 1 helps to store compressed gas, and can quickly provide sufficient gas source when the actuator needs to run. By utilizing the intermittent working characteristics of the actuator, the response speed of the actuator is accelerated, so that it can start and operate quickly. The control valve 2 is installed on the gas delivery pipe, which can accurately control the gas delivery volume and delivery timing, and flexibly adjust the gas supply process according to the actual working needs of the actuator. The gas delivery pipe connects the gas tank 1 with the air intake and exhaust pipes, ensuring the integrity and smoothness of the entire gas supply system, and providing a reliable gas source guarantee for the stable and efficient operation of the actuator.

[0038] The method of using this small-sized and fast-response pneumatic actuator is as follows:

[0039] Preparation stage

[0040] Check each component: Check whether the gas tank 1 has sufficient compressed gas storage capacity and confirm that it is leak-free. Carefully check whether the control valve 2 is in normal working condition and can be flexibly opened and closed to accurately control gas delivery. Check whether the gas delivery pipe connection is tight to prevent air leakage. Carry out a comprehensive inspection of the mechanical structural components such as the cylinder body, the first end cover 6, the drive housing 9, the second end cover 17, the third end cover 27 and the piston guide shaft 19 to ensure that the connection between them is stable and the seal is good; check the sliding sealing connection between each piston and the cylinder wall to ensure that there is no gap or damage to avoid gas leakage affecting the performance of the actuator. At the same time, check whether each spring is in normal condition and whether there is any damage or insufficient elasticity.

[0041] Adjust the limit bolts: According to the actual work accuracy and action requirements, flexibly adjust the positions of the first limit bolt 7, the second limit bolt 11 and the third limit bolt 15, determine the reasonable motion range and rotation angle of the first piston 16 and the crank 10, and ensure that the actuator outputs the motion amplitude and angle accuracy that meet the work requirements.

[0042] Operational phase

[0043] To start the gas supply: Open control valve 2, and the compressed gas stored in gas tank 1 is delivered via the gas delivery pipe to the intake and exhaust ducts on the inner cylinder sidewall. The gas enters the motion chamber of the second piston 21 through the intake and exhaust ports 28, pushing the second piston 21 in motion according to the corresponding configuration of the multiple pneumatic drive mechanisms. Thanks to the evenly distributed second springs 22 and the strategically positioned intake and exhaust ports 28, the second piston 21 can move smoothly and precisely. The coordinated operation of the multiple pneumatic drive mechanisms drives the linear motion of the push rod 18.

[0044] Power transmission and output: The push rod 18 passes through the first piston 16 and drives it to slide in the motion cavity of the first piston 16. At the same time, the end of the push rod 18 extending into the drive box 9 drives the guide slider 13 to move stably under the guidance of the slider guide shaft 8 through the ball head connecting rod 14. The guide slider 13 drives the crank 10 to rotate through the transmission pin 12, converting the linear motion of the push rod 18 into the rotational motion of the crank 10, and realizing power output through the fixed connection between the crank 10 and the output shaft of the drive box 9, thereby driving the external equipment to work.

[0045] Continuous and stable operation: During the air supply process, the air tank 1 continuously provides air source protection, and the air intake and exhaust pipes and the air intake and exhaust ports 28 accurately supply and exhaust air to the pneumatic drive mechanism, ensuring the continuous and stable operation of the actuator. Multiple third springs and the third piston 26 that cooperate with them assist and regulate the movement of the push rod 18, and provide buffering and reset functions when subjected to external impact or when reset is required, ensuring the stable operation of the actuator. The piston guide shaft 19 ensures the accurate position and direction of each piston (second piston 21 and third piston 26) and the fixed spring seat 23 during movement, preventing them from deflecting, shaking or getting stuck, and improving the stability and reliability of the actuator operation.

[0046] Stop phase

[0047] Close control valve 2: After the work task is completed, close control valve 2 to cut off the gas supply from gas tank 1 to the intake and exhaust pipes.

[0048] Reset Operation: After the air supply is stopped, the second piston 21 in each pneumatic drive mechanism returns to its initial position under the action of the second spring 22, pushing the gas into the intake and exhaust ducts through the intake and exhaust ports 28. The first piston 16 also returns to its initial position under the action of the first spring 4. Simultaneously, the crank 10, guide slider 13, and other components return to their corresponding initial positions under the restraint of the corresponding limit bolts. The entire actuator completes the reset process and awaits the next operating instruction.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A small-volume and fast-response pneumatic actuator, characterized by: include: A cylinder body, the cylinder body comprising an outer cylinder (3) and an inner cylinder, the inner cylinder having a first end and a second end which are arranged opposite to each other and are in communication with each other, the outer cylinder (3) having a first end and a second end which are arranged opposite to each other and are in communication with each other, the inner cylinder being sleeved in the outer cylinder (3), the outer edge of the first end of the inner cylinder being integrally connected to the first end of the outer cylinder (3), an annular cavity being provided between the inner cylinder and the outer cylinder (3), a first piston (16) movement cavity being provided in a portion of the outer cylinder (3) not sleeved with the inner cylinder, and a second piston (21) movement cavity being provided in the inner cylinder; a first end cover (6), the first end cover (6) being tightly connected to the first end of the outer cylinder (3); A driving box (9), wherein the driving box (9) is fixedly connected to the first end cover (6); a second end cover (17), the second end cover (17) being tightly connected to the second end of the inner cylinder; a third end cover (27), the third end cover (27) being tightly connected to the first end of the inner cavity; A first piston (16), wherein the first piston (16) is slidably connected in the first piston (16) movement chamber and an outer edge of the first piston (16) is slidably and sealingly connected to the inner wall of the outer cylinder (3); a first spring (4), wherein the first spring (4) is sleeved in the annular cavity, and one end of the first spring (4) is detachably connected to the first piston (16), and the other end of the first spring (4) is detachably connected to the second end of the outer cylinder (3); A plurality of pneumatic drive mechanisms, each of the pneumatic drive mechanisms being sequentially connected in series within the second piston (21) motion chamber; a push rod (18), the push rod (18) passing through the first piston (16) and being fixedly connected to the first piston (16), one end of the push rod (18) passing through the second end cover (17) and being fixedly connected to the output end of each of the pneumatic drive mechanisms, the push rod (18) and the second end cover (17) being sealingly and slidingly connected, the other end of the push rod (18) passing through the first end cover (6) and extending into the drive housing (9), and the push rod (18) and the first end cover (6) being slidingly connected; and A connecting rod mechanism, one end of which is transmission-connected to one end of the push rod (18) extending into the drive housing (9), and the other end of which is fixedly connected to the output shaft of the drive housing (9).

2. The small-volume and fast-response pneumatic actuator according to claim 1, characterized in that: An air intake and exhaust pipe is provided in the side wall of the inner cylinder, and a plurality of air intake and exhaust ports (28) are provided on the side wall of the inner cylinder to connect the second piston (21) movement chamber and the air intake and exhaust pipe. The air intake and exhaust ports (28) are arranged in sequence along the length direction of the inner cylinder. One end of the air intake and exhaust pipe extends out of the inner cylinder and is connected to the air source mechanism. The air intake and exhaust ports (28) are arranged corresponding to the pneumatic drive mechanism.

3. The small-volume and fast-response pneumatic actuator according to claim 2, characterized in that: The pneumatic drive mechanism comprises a fixed spring seat (23), a plurality of second springs (22) and a second piston (21); the fixed spring seat (23) is sealed and fixedly connected to the inner cylinder; the second piston (21) is slidably connected to the movement chamber of the second piston (21) and the outer edge of the second piston (21) is slidably and sealedly connected to the inner wall of the inner cylinder; one end of the second spring (22) is detachably fixedly connected to the fixed spring seat (23) and the other end is detachably fixedly connected to the second piston (21); the air intake and exhaust port (28) is arranged between the fixed spring seat (23) and the adjacent second piston (21) and is close to the fixed spring seat (23).

4. The small-volume and fast-response pneumatic actuator according to claim 3, characterized in that: Each of the second springs (22) is evenly arranged between the fixed spring seat (23) and the second piston (21).

5. The small-volume and fast-response pneumatic actuator according to claim 4, characterized in that: The invention also includes a plurality of third springs and a third piston (26), wherein the third piston (26) is slidably connected to the movement chamber of the second piston (21) and the outer edge of the second piston (21) is slidably and sealedly connected to the inner wall of the inner cylinder, the third piston (26) is detachably connected to the push rod (18), one end of the third spring is detachably connected to the third end cover (27), and the other end is detachably connected to the third piston (26).

6. The small-volume and fast-response pneumatic actuator according to claim 5, characterized in that: The invention also includes a plurality of piston guide shafts (19), one end of each piston guide shaft (19) is detachably connected to the third end cover (27), and the other end is detachably connected to the second end cover (17). The piston guide shaft (19) passes through and is sealingly and slidably connected to each second piston (21), each fixed spring seat (23) and the third piston (26).

7. The small-volume and fast-response pneumatic actuator according to claim 6, characterized in that: It also includes a first limiting bolt (7), the first end cover (6) is provided with a first threaded hole, the first limiting screw is threadedly connected to the first threaded hole, and one end of the first limiting screw extends into the movement cavity of the first piston (16) for abutting against the first piston (16) to adjust the sliding stroke of the first piston (16).

8. The small-volume and fast-response pneumatic actuator according to claim 7, characterized in that: The connecting rod mechanism includes a ball head connecting rod (14), a guide slider (13), a transmission pin (12), a slider guide shaft (8) and a crank (10). One end of the ball head connecting rod (14) is fixedly connected to one end of the push rod (18) extending into the drive housing (9), and the other end is transmission-connected to the guide slider (13). The crank (10) is transmission-connected to the guide slider (13) through the transmission pin (12). The slider guide shaft (8) is fixedly connected to the inside of the drive housing (9) and is arranged parallel to the push rod (18). The guide slider (13) is sleeved on the outside of the slider guide shaft (8), and the slider guide shaft (8) can guide the moving direction of the guide slider (13). The crank (10) is fixedly connected to the output shaft of the drive housing (9).

9. The small-volume and fast-response pneumatic actuator according to claim 8, characterized in that: The invention also includes a second limiting bolt (11) and a third limiting bolt (15), the driving housing (9) is provided with a second threaded hole and a third threaded hole, the second limiting bolt (11) is threadedly connected to the second threaded hole, the third limiting bolt (15) is threadedly connected to the third threaded hole, and one end of the second limiting bolt (11) extends into the driving housing (9) and is used to abut against the crank (10) to limit the clockwise rotation angle of the crank (10), and one end of the third limiting bolt (15) extends into the driving housing (9) and is used to abut against the crank (10) to limit the counterclockwise rotation angle of the crank (10).

10. The small-volume and fast-response pneumatic actuator according to claim 9, characterized in that: It also includes a gas storage tank (1), a control valve (2) and a gas delivery pipe, one end of the gas delivery pipe is connected to the gas storage tank (1), and the other end is connected to the air intake and exhaust pipes, and the control valve (2) is installed on the gas delivery pipe.

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