Air cylinder with high buffering performance for pneumatic valve

Abstract

The invention discloses a high-buffering-performance air cylinder for a pneumatic valve. The high-buffering-performance air cylinder comprises a cylinder body and a piston movably arranged in the cylinder body in a penetrating mode. The piston divides the interior of the cylinder body into a rodless cavity and a rod cavity; a first gas path and a second gas path are arranged on the cylinder wall in the cylinder body; the first gas path and the second gas path are both communicated with the rodless cavity and the rod cavity; a first driving assembly is arranged in the rodless cavity of the first gas circuit in a sealing manner; a second driving assembly is hermetically arranged in the rod cavity of the second gas circuit; the piston part of the piston is provided with first through holes corresponding to the first gas path and the second gas path respectively; a sealing sliding block used for controlling opening and closing of the first through hole is movably arranged on the piston part of the piston. The sealing slide block corresponding to the first gas path can enable the corresponding first through hole to communicate the rodless cavity with the rod cavity under the driving of the first driving assembly; a sealing slide block corresponding to the second gas path can enable a corresponding first through hole to communicate a rodless cavity with a rod cavity under the driving of a second driving assembly; and the service life and the buffering performance of the cylinder are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinders, and more specifically to a cylinder for a pneumatic valve with strong buffering performance. Background Art

[0002] Traditional pneumatic actuators generally adopt the technical solution of using a cylinder to drive the valve core to actuate. Specifically, when compressed gas acts on the cylinder chamber, the reciprocating motion of the piston drives the valve core to actuate, thereby realizing the on-off control or flow regulation of the fluid medium.

[0003] However, the existing technology has significant defects in practical applications: when the actuator is in a high-frequency start-stop working condition or a high-speed moving state, limited by the inertia of the piston assembly and the commutation hysteresis effect, the piston is prone to impact when approaching the end of the stroke, affecting the structural stability of the pneumatic valve, resulting in reduced structural sealing performance and service life. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned disadvantages and provide a cylinder for a pneumatic valve with strong buffering performance, which has high structural reliability and effectively improves the service life and buffering performance of the cylinder.

[0005] To achieve the above purpose, the specific solution of the present invention is as follows:

[0006] A cylinder for a pneumatic valve with strong buffering performance, including a cylinder body and a piston movably inserted into the cylinder body; the piston divides the inside of the cylinder body into a rodless chamber and a rod chamber; at least one first air passage and at least one second air passage are provided on the cylinder wall inside the cylinder body; both ends of the first air passage and both ends of the second air passage are respectively communicated with the rodless chamber and the rod chamber; each first air passage is hermetically provided with a first driving assembly in the rodless chamber; each second air passage is hermetically provided with a second driving assembly in the rod chamber;

[0007] The plug portion of the piston is respectively provided with a first through hole corresponding to each first air passage and each second air passage; the plug portion of the piston is respectively movably provided with a sealing slider corresponding to each first through hole; the sealing slider is used to control the opening and closing of the first through hole; the sealing slider corresponding to the first air passage can, under the drive of the first driving assembly, connect the corresponding first through hole to communicate the rodless chamber and the rod chamber; the sealing slider corresponding to the second air passage can, under the drive of the second driving assembly, connect the corresponding first through hole to communicate the rodless chamber and the rod chamber.

[0008] Further, the first driving assembly includes a first top block and a second top block; a cylinder wall of the cylinder body is provided with a first accommodation groove and a second accommodation groove communicated with the first air path in the rodless cavity; the first accommodation groove is arranged close to the rod cavity; the first top block is slidably arranged in the first accommodation groove; a first tension spring is connected between the first top block and the cylinder body; the first top block is provided with a first inclined surface; the second top block is hermetically and slidably arranged in the second accommodation groove; the second top block is provided with a second inclined surface; when air enters the rod cavity, the first top block can overcome the acting force of the first tension spring and push the second top block to protrude out of the second accommodation groove through the first inclined surface.

[0009] Further, the second driving assembly includes a third top block and a fourth top block; a cylinder wall in the cylinder body is provided with a third accommodation groove and a fourth accommodation groove communicated with the second air path in the rod cavity; the third accommodation groove is arranged close to the rodless cavity; the third top block is slidably arranged in the third accommodation groove; a second tension spring is connected between the third top block and the cylinder body; the third top block is provided with a third inclined surface; the fourth top block is hermetically and slidably arranged in the fourth accommodation groove; the fourth top block is provided with a fourth inclined surface; when air enters the rodless cavity, the third top block can overcome the acting force of the second tension spring and push the fourth top block to protrude out of the fourth accommodation groove through the third inclined surface.

[0010] Further, the sealing slider is provided with a second through hole, and a first spring is connected between the sealing slider and the plug portion of the piston; when the position of the second through hole corresponds to the position of the first through hole, the rodless cavity is communicated with the rod cavity.

[0011] Further, two relatively arranged first air paths and two relatively arranged second air paths are arranged on the cylinder wall in the cylinder body.

[0012] Further, buffer pads are respectively arranged at two ends of the cylinder body.

[0013] Further, a friction assembly is arranged on the plug portion of the piston; the friction assembly includes a friction slider and a friction block; the friction slider movably penetrates through the plug portion of the piston; second springs are respectively connected between two ends of the friction slider and the plug portion of the piston; the friction block is slidably arranged on the plug portion of the piston; a connecting rod is hinged between the friction block and the friction slider.

[0014] Further, two convex platforms are symmetrically arranged on the friction slider; the second springs are connected to the convex platforms.

[0015] Further, a plurality of the friction assemblies are arranged, and the plurality of friction assemblies are evenly distributed in the circumferential direction; the sealing slider and the friction assemblies are alternately arranged at intervals.

[0016] The beneficial effects of the present invention are as follows: By providing a sealing slider and a first through hole on the piston, and a first driving component and a second driving component at both ends in the cylinder body, when the piston moves close to the end of the stroke, the first driving component and the second driving component are used to open the first through hole with the sealing slider, so that the rodless cavity and the rod chamber communicate, reducing the pressure difference on both sides of the piston, thereby forming an adaptive buffer, reducing the impact at the end of the piston stroke, and without external control devices, pure mechanical linkage, with high structural reliability, effectively improving the service life and buffering performance of the cylinder. Description of the Drawings

[0017] Figure 1 is a schematic cross-sectional view of the present invention when the piston rod of the piston extends;

[0018] Figure 2 is Figure 1 a partial enlarged schematic view of part A in

[0019] Figure 3 is a schematic cross-sectional view of the present invention when the piston rod of the piston retracts;

[0020] Figure 4 is Figure 3 a partial enlarged schematic view of part B in

[0021] Figure 5 is a schematic cross-sectional view of the present invention when the sealing slider opens the first through hole with the fourth top block;

[0022] Figure 6 is a schematic cross-sectional view of the present invention when the sealing slider opens the first through hole with the second top block;

[0023] Figure 7 is a schematic structural view of the cylinder body of the present invention;

[0024] Figure 8 is an exploded schematic view of the piston, the sealing slider and the friction component of the present invention;

[0025] Figure 9 is a schematic cross-sectional view of the piston, the sealing slider and the friction component in cooperation of the present invention;

[0026] Figure 10 is a schematic cross-sectional view of the piston, the sealing slider and the friction component in cooperation of the present invention from another perspective;

[0027] Description of reference numerals: 1. Cylinder block; 11. End cover; 12. Rodless cavity; 13. Rod chamber; 14. First air passage; 15. Second air passage; 16. First accommodation groove; 17. Second accommodation groove; 18. Third accommodation groove; 19. Fourth accommodation groove; 2. Piston; 21. First through hole; 31. First top block; 32. Second top block; 33. First tension spring; 41. Third top block; 42. Fourth top block; 43. Second tension spring; 5. Sealing slider; 51. Second through hole; 6. First spring; 7. Buffer pad; 81. Friction slider; 811. Boss; 82. Friction block; 83. Second spring; 84. Connecting rod. Detailed implementation manners

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the scope of implementation of the present invention is not limited thereto.

[0029] As Figures 1 to 10 shown, a cylinder for a pneumatic valve with strong buffering performance described in this embodiment includes a cylinder block 1 and a piston 2; end covers 11 are respectively arranged at the upper and lower ends of the cylinder block 1; the two end covers 11 and the cylinder block 1 jointly enclose a cavity; air holes communicating with the cavity are respectively arranged on the two end covers 11;

[0030] The piston 2 is movably arranged in the cavity, and the peripheral wall of the piston 2 is in surface fit with the inner wall of the cylinder block 1 to limit the rotational freedom of the piston 2, thereby ensuring the reliability of the sliding of the piston 2; the piston rod of the piston 2 movably penetrates through the end cover 11 at one end and extends outwards; the piston 2 divides the inside of the cylinder block 1 into a rodless cavity 12 and a rod chamber 13; the rodless cavity 12 is located below, and the rod chamber 13 is located above. At least one first air passage 14 and at least one second air passage 15 are provided on the cylinder wall inside the cylinder block 1; both ends of the first air passage 14 and both ends of the second air passage 15 are respectively connected to the rodless cavity 12 and the rod chamber 13; a first driving component is hermetically arranged in each first air passage 14 in the rodless cavity 12; a second driving component is hermetically arranged in each second air passage 15 in the rod chamber 13; that is, the first driving component is arranged at the lower end position inside the cylinder block 1, and the second driving component is arranged at the upper end position inside the cylinder block 1. Specifically, the first driving component and the second driving component are respectively arranged at positions close to the end points of the stroke of the piston 2;

[0031] The plug portion of the piston 2 is respectively provided with first through holes 21 corresponding to each first air passage 14 and each second air passage 15; sealing sliders 5 are respectively movably arranged corresponding to each first through hole 21 on the plug portion of the piston 2; the sealing sliders 5 are used to control the opening and closing of the first through holes 21; the sealing slider 5 corresponding to the first air passage 14 can, under the drive of the first driving component, connect the corresponding first through hole 21 to communicate the rodless cavity 12 and the rod chamber 13; the sealing slider 5 corresponding to the second air passage 15 can, under the drive of the second driving component, connect the corresponding first through hole 21 to communicate the rodless cavity 12 and the rod chamber 13.

[0032] In the natural state, that is, when no air enters the rodless cavity 12 and the rod chamber 13, there is no pressure difference on both sides of the piston 2. The sealing slider 5 blocks the first through hole 21, and the rodless cavity 12 and the rod chamber 13 are completely isolated, maintaining the normal driving pressure difference.

[0033] When the piston rod of the piston 2 needs to extend in the cylinder of this embodiment, gas is introduced into the rodless cavity 12. At this time, the air pressure in the rodless cavity 12 is greater than the air pressure in the rod chamber 13, thereby pushing the piston 2 to slide. The effective volume of the rodless cavity 12 increases, and the effective volume of the rod chamber 13 decreases. The gas in the rodless cavity 12 causes the second driving assembly to be in a working state through the second gas path 15. When the piston part of the piston 2 approaches the end cover 11, that is, when the piston 2 runs near the end of the stroke, the corresponding sealing slider 5 on the piston 2 contacts the second driving assembly in the working state, causing the sealing slider 5 to open the first through hole 21, as Figure 5 shown, so that the rodless cavity 12 and the rod chamber 13 are connected, and the pressure difference between the rodless cavity 12 and the rod chamber 13 gradually decreases, thereby achieving adaptive buffering and reducing the impact force. After the pressure difference between both sides of the piston 2 tends to balance, the sealing slider 5 resets and closes the first through hole 21 again, restoring the isolated state.

[0034] Similarly, when the piston rod of the piston 2 needs to retract, gas is introduced into the rod chamber 13. At this time, the air pressure in the rod chamber 13 is greater than the air pressure in the rodless cavity 12, pushing the piston 2 to slide. The effective volume of the rodless cavity 12 decreases, and the effective volume of the rod chamber 13 increases. The gas in the rod chamber 13 causes the first driving assembly to be in a working state through the first gas path 14. When the piston 2 runs near the end of the stroke, the corresponding sealing slider 5 on the piston 2 contacts the first driving assembly in the working state, causing the sealing slider 5 to open the first through hole 21, as Figure 6 shown, the rodless cavity 12 and the rod chamber 13 are connected, and the pressure difference between the rodless cavity 12 and the rod chamber 13 gradually decreases, thereby achieving adaptive buffering and reducing the impact force. After the pressure difference between both sides of the piston 2 tends to balance, the sealing slider 5 resets and closes the first through hole 21 again to wait for the piston rod of the piston 2 to extend again.

[0035] In this embodiment, by providing the sealing slider 5 and the first through hole 21 on the piston 2, and providing the first driving assembly and the second driving assembly at both ends in the cylinder block 1, when the piston 2 moves close to the end of the stroke, the first driving assembly and the second driving assembly are used to make the sealing slider 5 open the first through hole 21, so that the rodless cavity 12 and the rod chamber 13 are connected, reducing the pressure difference between both sides of the piston 2, thereby forming adaptive buffering, reducing the impact at the end of the piston 2 stroke, and without external control components, pure mechanical linkage, high structural reliability, effectively improving the service life and buffering performance of the cylinder.

[0036] AsFigure 3 , Figure 4 , Figure 6 and Figure 7 As shown in Figure 6 , Figure 7 , in some embodiments, the cylinder for the pneumatic valve with strong buffering performance of this embodiment, the first driving component includes a first top block 31, a second top block 32 and a first tension spring 33; a first accommodating groove 16 and a second accommodating groove 17 communicating with the first air passage 14 are provided in the cylinder wall of the cylinder body 1 in the rodless cavity 12; the first accommodating groove 16 is arranged close to the rod cavity 13, that is, the first accommodating groove 16 is located at the upper end of the second accommodating groove 17; the first top block 31 is slidably arranged in the first accommodating groove 16; the first tension spring 33 is connected between the first top block 31 and the cylinder body 1; the first top block 31 is provided with a first inclined surface; the second top block 32 is hermetically slidably arranged in the second accommodating groove 17; the second top block 32 is provided with a second inclined surface; specifically, a first arc portion is provided at the end of the second inclined surface close to the first inclined surface, so that the first top block 31 can extrude the second top block 32 to extend out of the second accommodating groove 17; when air enters the rod cavity 13, the first top block 31 can overcome the acting force of the first tension spring 33 and push the second top block 32 to protrude out of the second accommodating groove 17 through the first inclined surface.

[0037] When the piston 2 slides downward, causing the piston rod of the piston 2 to retract inward, the gas in the rod cavity 13 enters the first air passage 14, thereby pushing the first top block 31 to overcome the pulling force of the first tension spring 33 and extend into the second accommodating groove 17. Under the action of the first inclined surface, the first top block 31 extrudes the second top block 32, causing the second top block 32 to protrude into the rodless cavity 12. Thus, when the piston 2 slides downward to approach the end of the stroke, the corresponding sealing slider 5 contacts the second inclined surface of the protruding second top block 32, and the second top block 32 extrudes the sealing slider 5 to slide, causing the sealing slider 5 to slide to open the first through hole 21, as Figure 6 shown. At this time, the rod cavity 13 and the rodless cavity 12 are connected, and the pressure difference on both sides of the piston 2 decreases, thereby reducing the impact at the end of the piston 2 stroke, which is beneficial to extending the service life of the cylinder sealing ring and improving the use reliability of the cylinder.

[0038] When the pressure difference on both sides of the piston 2 tends to balance, the first tension spring 33 pulls the first top block 31 to reset, releases the extrusion on the second top block 32, the sealing slider 5 resets, and pushes the second top block 32 to reset, thereby closing the first through hole 21, as Figure 3 and Figure 4 shown.

[0039] As Figure 1 , Figure 2 , Figure 5 and Figure 7As shown, in some embodiments, the cylinder for a pneumatic valve with strong buffering performance in this embodiment, the second driving assembly includes a third top block 41, a fourth top block 42 and a second tension spring 43; on the cylinder wall inside the cylinder body 1, a third accommodation groove 18 and a fourth accommodation groove 19 communicating with the second air passage 15 are provided in the rod chamber 13; the third accommodation groove 18 is arranged close to the rodless chamber 12, that is, the third accommodation groove 18 is located at the lower end of the fourth accommodation groove 19; the third top block 41 is slidably arranged in the third accommodation groove 18; the second tension spring 43 is connected between the third top block 41 and the cylinder body 1; the third top block 41 is provided with a third inclined surface; the fourth top block 42 is hermetically slidably arranged in the fourth accommodation groove 19; the fourth top block 42 is provided with a fourth inclined surface; specifically, the end of the fourth inclined surface close to the third inclined surface is provided with a second arc portion, so that the third top block 41 can extrude the fourth top block 42 to protrude out of the fourth accommodation groove 19; when air enters the rodless chamber 12, the third top block 41 can overcome the acting force of the second tension spring 43 and push the fourth top block 42 to protrude out of the fourth accommodation groove 19 through the third inclined surface.

[0040] When the piston 2 slides upward, causing the piston rod of the piston 2 to extend outward, the gas in the rodless chamber 12 enters the second air passage 15, thereby pushing the third top block 41 to overcome the tension of the second tension spring 43 and extend into the fourth accommodation groove 19. Under the action of the third inclined surface, the third top block 41 extrudes the fourth top block 42, causing the fourth top block 42 to protrude into the rod chamber 13. Thus, when the piston 2 slides upward to approach the end of the stroke, the corresponding sealing slider 5 contacts the fourth inclined surface of the protruding fourth top block 42, and the fourth top block 42 extrudes the sealing slider 5 to slide, causing the sealing slider 5 to slide to open the first through hole 21, as Figure 5 shown. At this time, the rod chamber 13 and the rodless chamber 12 are connected, and the pressure difference on both sides of the piston 2 decreases, thereby reducing the impact at the end of the piston 2 stroke.

[0041] When the pressure difference on both sides of the piston 2 tends to balance, the second tension spring 43 pulls the third top block 41 to reset, releases the extrusion on the fourth top block 42, the sealing slider 5 resets, and pushes the fourth top block 42 to reset, thereby closing the first through hole 21, as Figure 1 and Figure 2 shown.

[0042] This embodiment realizes the internal self-buffering process without external control signals by setting pressure difference drive + mechanical linkage, which not only ensures the high sealing performance of the overall cylinder, but also greatly reduces the impact at the end of the piston 2, which is beneficial to extending the service life of the cylinder and is applicable to the control occasions of pneumatic valves with high frequency, high response and high sealing requirements.

[0043] As Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 9As shown, for the cylinder of the pneumatic valve with strong buffering performance in this embodiment, in some embodiments, the sealing slider 5 is provided with a second through hole 51, and a first spring 6 is connected between the sealing slider 5 and the plug portion of the piston 2; when the position of the second through hole 51 corresponds to the position of the first through hole 21, the rodless chamber 12 communicates with the rod chamber 13. In this embodiment, by setting the first spring 6, when the piston 2 slides, the sealing slider 5 contacts the second top block 32 or the fourth top block 42, so that the sealing slider 5 contracts inward against the elastic force of the first spring 6, making the position of the second through hole 51 correspond to the position of the first through hole 21, thereby connecting the rodless chamber 12 and the rod chamber 13 to reduce the pressure difference on both sides of the piston 2 and achieve the buffering effect; when the pressure difference on both sides of the piston 2 tends to balance, the first spring 6 pushes the sealing slider 5 to reset, so that the sealing slider 5 can push the corresponding second top block 32 or fourth top block 42 to automatically reset without an external control signal.

[0044] As Figure 7 shown, for the cylinder of the pneumatic valve with strong buffering performance in this embodiment, in some embodiments, the cylinder wall in the cylinder body 1 is provided with two relatively arranged first air paths 14 and two relatively arranged second air paths 15. Correspondingly, four first through holes 21 and four sealing sliders 5 are provided on the piston 2, and two sealing sliders 5 correspond to the two first air paths 14 one by one, and two sealing sliders 5 correspond to the two second air paths 15 one by one. Such a setting is to improve the self-buffering process inside the cylinder body 1 and the buffering effect is better.

[0045] As Figures 1 to 6 shown, for the cylinder of the pneumatic valve with strong buffering performance in this embodiment, in some embodiments, buffer pads 7 are respectively provided at both ends in the cylinder body 1. In this embodiment, by setting the buffer pads 7, the buffering effect at the end position of the piston 2 stroke is further improved, and the reliability of the cylinder is further enhanced.

[0046] As Figure 8 and Figure 10As shown, for the air cylinder for pneumatic valve with strong buffering performance in this embodiment, in some embodiments, a friction assembly is provided on the plug portion of the piston 2; the friction assembly includes a friction slider 81 and a friction block 82; the friction slider 81 movably penetrates through the plug portion of the piston 2; second springs 83 are connected between the two ends of the friction slider 81 and the plug portion of the piston 2 respectively; the friction block 82 is slidably arranged on the plug portion of the piston 2; a connecting rod 84 is hinged between the friction block 82 and the friction slider 81. Specifically, when there is no pressure difference on both sides of the piston 2, the two second springs 83 are balanced, the connecting rod 84 is horizontal, and the friction block 82 extends out to be in frictional contact with the cylinder wall of the cylinder body 1, so that the piston 2 can be stably maintained in the current pressure relief position, preventing the piston 2 from getting out of control during pressure relief buffering and thus strengthening the impact force; when the rodless chamber 12 or the rod chamber 13 intakes air, the friction slider 81 slides under the action of air pressure, so that the corresponding second spring 83 is compressed and the other second spring 83 is stretched. For example, when the rodless chamber 12 intakes air, the friction slider 81 slides towards the rod chamber 13, and when the rod chamber 13 intakes air, the friction slider 81 slides towards the rodless chamber 12; during the sliding process of the friction slider 81, the friction block 82 is driven by the connecting rod 84 to automatically retract, thereby reducing the sliding resistance of the piston 2 and improving the feeding efficiency.

[0047] As Figure 8 and Figure 10 As shown, for the air cylinder for pneumatic valve with strong buffering performance in this embodiment, in some embodiments, the friction slider 81 is symmetrically provided with two bosses 811; the second spring 83 is connected to the bosses 811. In this embodiment, by providing the two bosses 811, it is convenient for the installation of the second spring 83.

[0048] As Figure 8 As shown, for the air cylinder for pneumatic valve with strong buffering performance in this embodiment, in some embodiments, a plurality of friction assemblies are provided, and the plurality of friction assemblies are evenly distributed in the circumferential direction; the sealing slider 5 and the friction assemblies are alternately arranged at intervals. In this embodiment, by providing a plurality of friction assemblies distributed in the circumferential direction, the stability of the piston 2 in the pressure relief position is enhanced.

[0049] The above are only the preferred embodiments of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the scope of this invention patent application are included in the protection scope of this invention patent application.

Claims

1. A cylinder for a pneumatic valve with strong buffering performance, characterized in that, It includes a cylinder block and a piston movably inserted into the cylinder block; the piston divides the interior of the cylinder block into a rodless chamber and a rod chamber; at least one first air passage and at least one second air passage are provided on the cylinder wall inside the cylinder block; both ends of the first air passage and both ends of the second air passage are respectively communicated with the rodless chamber and the rod chamber; a first driving component is hermetically provided in the rodless chamber for each first air passage; a second driving component is hermetically provided in the rod chamber for each second air passage. The plug portion of the piston is respectively provided with first through holes corresponding to each first air passage and each second air passage; a sealing slider is movably provided corresponding to each first through hole on the plug portion of the piston; the sealing slider is used to control the opening and closing of the first through hole; the sealing slider corresponding to the first air passage can, under the drive of the first driving component, make the corresponding first through hole communicate the rodless chamber and the rod chamber; the sealing slider corresponding to the second air passage can, under the drive of the second driving component, make the corresponding first through hole communicate the rodless chamber and the rod chamber.

2. The air cylinder for a pneumatic valve with strong buffering performance according to claim 1, wherein, The first driving component includes a first top block and a second top block; the cylinder wall of the cylinder block is provided with a first accommodation groove and a second accommodation groove communicating with the first air passage in the rodless chamber; the first accommodation groove is arranged close to the rod chamber; the first top block is slidably arranged in the first accommodation groove; a first tension spring is connected between the first top block and the cylinder block; the first top block is provided with a first inclined surface; the second top block is hermetically and slidably arranged in the second accommodation groove; the second top block is provided with a second inclined surface; when air enters the rod chamber, the first top block can overcome the acting force of the first tension spring and push the second top block to protrude out of the second accommodation groove through the first inclined surface.

3. The air cylinder for a pneumatic valve with strong buffering performance according to claim 1, wherein The second driving component includes a third top block and a fourth top block; the cylinder wall inside the cylinder block is provided with a third accommodation groove and a fourth accommodation groove communicating with the second air passage in the rod chamber; the third accommodation groove is arranged close to the rodless chamber; the third top block is slidably arranged in the third accommodation groove; a second tension spring is connected between the third top block and the cylinder block; the third top block is provided with a third inclined surface; the fourth top block is hermetically and slidably arranged in the fourth accommodation groove; the fourth top block is provided with a fourth inclined surface; when air enters the rodless chamber, the third top block can overcome the acting force of the second tension spring and push the fourth top block to protrude out of the fourth accommodation groove through the third inclined surface.

4. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, wherein, The sealing slider is provided with a second through hole, and a first spring is connected between the sealing slider and the plug portion of the piston; when the position of the second through hole corresponds to the position of the first through hole, the rodless chamber communicates with the rod chamber.

5. The air cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that Two relatively arranged first air passages and two relatively arranged second air passages are provided on the cylinder wall inside the cylinder block.

6. The air cylinder for a pneumatic valve with strong buffering performance according to claim 1, wherein, Buffer pads are respectively provided at both ends inside the cylinder block.

7. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that, The plug portion of the piston is provided with a friction component; the friction component includes a friction slider and a friction block; the friction slider movably penetrates through the plug portion of the piston; second springs are respectively connected between both ends of the friction slider and the plug portion of the piston; the friction block is slidably arranged on the plug portion of the piston; a connecting rod is hinged between the friction block and the friction slider.

8. A cylinder for a pneumatic valve with strong buffering performance according to claim 7, characterized in that, Two convex platforms are symmetrically provided on the friction slider; the second springs are connected to the convex platforms.

9. The air cylinder for a pneumatic valve with strong buffering performance according to claim 7, characterized in that, A plurality of the friction assemblies are provided, and the plurality of the friction assemblies are circumferentially arranged at equal intervals; the sealing sliders and the friction assemblies are alternately arranged at intervals.

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