A cylinder for pneumatic valve with strong buffering performance

Abstract

The present invention discloses a cylinder for a pneumatic valve with strong buffering performance, comprising a cylinder body and a piston movably arranged in the cylinder body; the piston divides the cylinder body into a rodless chamber and a rod chamber; the cylinder wall in the cylinder body is provided with a first air path and a second air path; the first air path and the second air path are both connected with the rodless chamber and the rod chamber; the first air path is sealed with a first drive component in the rodless chamber; the second air path is sealed with a second drive component in the rod chamber; the plug portion of the piston is respectively provided with first through holes corresponding to the first air path and the second air path; the plug portion of the piston is movably provided with a sealing slider for controlling the opening and closing of the first through hole; the sealing slider corresponding to the first air path can, under the drive of the first drive component, connect the rodless chamber with the rod chamber through the corresponding first through hole; the sealing slider corresponding to the second air path can, under the drive of the second drive component, connect the rodless chamber with the rod chamber through the corresponding first through hole; the structural reliability is high, and the service life and buffering performance of the cylinder are effectively improved.

Description

Technical Field

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

[0002] Traditional pneumatic actuators generally use a cylinder-driven valve core actuation technology. Specifically, when compressed gas acts on the cylinder chamber, the reciprocating motion of the piston drives the valve core actuation, thereby achieving 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 condition or a high-speed movement state, due to the inertia of the piston assembly and the switching 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 shortcomings and provide a cylinder for a pneumatic valve with strong buffering performance, high structural reliability, and effectively improve the service life and buffering performance of the cylinder.

[0005] To achieve the above object, the specific solutions of the present invention are as follows:

[0006] A pneumatic valve cylinder with strong buffering performance comprises a cylinder body and a piston movably provided in the cylinder body; the piston divides the cylinder body into a rodless chamber and a rod chamber; a cylinder wall in the cylinder body is provided with at least one first air path and at least one second air path; both ends of the first air path and the second air path are respectively connected to the rodless chamber and the rod chamber; each of the first air paths is sealed with a first drive assembly in the rodless chamber; each of the second air paths is sealed with a second drive assembly in the rod chamber;

[0007] The plug part of the piston is respectively provided with a first through hole corresponding to each first air path and each second air path; the plug part of the piston is respectively provided with a sealing slider movably 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 path can, under the drive of the first driving component, enable the corresponding first through hole to connect the rodless cavity and the rod cavity; the sealing slider corresponding to the second air path can, under the drive of the second driving component, enable the corresponding first through hole to connect the rodless cavity and the rod cavity.

[0008] The present invention further provides that the first driving assembly includes a first top block and a second top block; the cylinder wall of the cylinder body is provided with a first accommodating groove and a second accommodating groove connected in series with the first air path in the rodless chamber; the first accommodating groove is arranged close to the rod chamber; the first top block is slidably arranged in the first accommodating 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 sealingly slidably arranged in the second accommodating groove; the second top block is provided with a second inclined surface; the first top block can overcome the action of the first tension spring when air is taken into the rod chamber, and push the second top block to protrude out of the second accommodating groove through the first inclined surface.

[0009] The present invention further provides that the second driving assembly includes a third top block and a fourth top block; the cylinder wall in the cylinder body is provided with a third accommodating groove and a fourth accommodating groove in series in the rod chamber, which are connected to the second air path; the third accommodating groove is arranged close to the rodless chamber; the third top block is slidably arranged in the third accommodating 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 sealingly slidably arranged in the fourth accommodating groove; the fourth top block is provided with a fourth inclined surface; the third top block can overcome the action of the second tension spring when air is taken into the rodless chamber, and push the fourth top block to protrude out of the fourth accommodating groove through the third inclined surface.

[0010] The present invention further provides a second through hole on the sealing slider, 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 connected to the rod cavity.

[0011] Furthermore, the present invention provides a cylinder wall inside the cylinder body with two oppositely arranged first air paths and two oppositely arranged second air paths.

[0012] Furthermore, the present invention provides buffer pads at both ends of the cylinder body.

[0013] The present invention further provides a friction assembly on the plug portion of the piston; the friction assembly includes a friction slider and a friction block; the friction slider moves through the plug portion of the piston; a second spring is connected between the two ends of the friction slider and the plug portion of the piston respectively; 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] Furthermore, in the present invention, the friction sliding block is symmetrically provided with two bosses; and the second spring is connected to the bosses.

[0015] Furthermore, the present invention provides a plurality of friction assemblies, which are uniformly distributed along the circumferential direction; and the sealing sliders and the friction assemblies are alternately arranged at intervals.

[0016] The beneficial effects of the present invention are as follows: the present invention arranges a sealing slider and a first through hole on the piston, and arranges a first drive assembly and a second drive assembly at both ends of the cylinder body, so that when the piston moves near the end of the stroke, the first drive assembly and the second drive assembly are utilized to make the sealing slider open the first through hole, so that the rodless cavity and the rod cavity are connected, 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 no external control device is required, pure mechanical linkage, high structural reliability, and effectively improving the service life and buffering performance of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional schematic diagram of the present invention when the plug rod of the piston is extended;

[0018] Figure 2 yes Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0019] Figure 3 It is a cross-sectional schematic diagram of the present invention when the plug rod of the piston is retracted;

[0020] Figure 4 yes Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0021] Figure 5 is a cross-sectional schematic diagram of the present invention when the fourth top block causes the sealing slider to open the first through hole;

[0022] Figure 6 It is a cross-sectional schematic diagram of the present invention when the second top block causes the sealing slider to open the first through hole;

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

[0024] Figure 8 1 is an exploded schematic diagram of the piston, sealing slider and friction assembly of the present invention;

[0025] Figure 9 It is a cross-sectional schematic diagram of the piston, sealing slider and friction assembly of the present invention when they are in cooperation;

[0026] Figure 10 is a cross-sectional schematic diagram of another perspective of the piston, sealing slider and friction assembly of the present invention when they are fitted together;

[0027] Explanation of the accompanying drawings: 1. Cylinder body; 11. End cover; 12. Rodless chamber; 13. Rod chamber; 14. First air path; 15. Second air path; 16. First accommodating groove; 17. Second accommodating groove; 18. Third accommodating groove; 19. Fourth accommodating 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 DESCRIPTION

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

[0029] like Figures 1 to 10 As shown, the embodiment of the present invention provides a pneumatic valve cylinder with strong buffering performance, comprising a cylinder body 1 and a piston 2; end caps 11 are respectively provided at the upper and lower ends of the cylinder body 1; the two end caps 11 and the cylinder body 1 together enclose a cavity; and the two end caps 11 are respectively provided with air holes communicating with the cavity;

[0030] The piston 2 is movably arranged in the cavity, and the peripheral wall of the piston 2 cooperates with the inner wall surface of the cylinder body 1 to limit the rotational freedom of the piston 2, thereby ensuring the reliability of the sliding of the piston 2; the plug rod of the piston 2 is movably passed through the end cover 11 at one end and then extends outward; the piston 2 divides the cylinder body 1 into a rodless chamber 12 and a rod chamber 13; the rodless chamber 12 is located at the bottom, and the rod chamber 13 is located at the top, and the cylinder wall in the cylinder body 1 is provided with at least one first air path 14 and at least one second air path 15; the two ends of the first air path 14 and the two ends of the second air path 15 are respectively connected to the rodless chamber 12 and the rod chamber 13; each first air path 14 is sealed with a first drive assembly in the rodless chamber 12; each second air path 15 is sealed with a second drive assembly in the rod chamber 13; that is, the first drive assembly is arranged at the lower end position in the cylinder body 1, and the second drive assembly is arranged at the upper end position in the cylinder body 1. Specifically, the first drive assembly and the second drive assembly are respectively arranged at positions close to the end points of the stroke of the piston 2;

[0031] The plug part of the piston 2 is respectively provided with a first through hole 21 corresponding to each first through hole 14 and each second through hole 15; the plug part of the piston 2 is respectively provided with a sealing slider 5 movably corresponding to each first through hole 21; the sealing slider 5 is used to control the opening and closing of the first through hole 21; the sealing slider 5 corresponding to the first air circuit 14 can, under the drive of the first driving component, enable the corresponding first through hole 21 to connect the rodless cavity 12 and the rod cavity 13; the sealing slider 5 corresponding to the second air circuit 15 can, under the drive of the second driving component, enable the corresponding first through hole 21 to connect the rodless cavity 12 and the rod cavity 13.

[0032] In the natural state, that is, when no air enters the rodless chamber 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 chamber 12 and the rod chamber 13 are completely isolated to maintain a normal driving pressure difference.

[0033] When the piston rod of the pneumatic valve cylinder of this embodiment needs to extend, gas is introduced into the rodless chamber 12. At this time, the air pressure in the rodless chamber 12 is greater than the air pressure in the rod chamber 13, thereby pushing the piston 2 to slide, and the effective volume of the rodless chamber 12 increases, and the effective volume of the rod chamber 13 decreases. The gas in the rodless chamber 12 is put into the working state through the second air path 15. When the plug of the piston 2 is close to the end cover 11, that is, when the piston 2 runs to the end of the stroke, the corresponding sealing slider 5 on the piston 2 contacts the second driving assembly in the working state, so that the sealing slider 5 opens the first through hole 21. Figure 5 As shown, the rodless chamber 12 and the rod chamber 13 are connected, and the pressure difference between the rodless chamber 12 and the rod chamber 13 gradually decreases, thereby adaptively buffering and reducing the impact force. After the pressure difference on both sides of the piston 2 tends to be balanced, the sealing slider 5 is reset, and the first through hole 21 is closed again to restore the isolation state.

[0034] Similarly, when the piston rod of the piston 2 needs to be retracted, 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 chamber 12, pushing the piston 2 to slide. The effective volume of the rodless chamber 12 decreases, and the effective volume of the rod chamber 13 increases. The gas in the rod chamber 13 is put into the working state through the first air path 14. When the piston 2 moves to the end of the stroke, the corresponding sealing slider 5 on the piston 2 contacts the first driving assembly in the working state, so that the sealing slider 5 opens the first through hole 21. Figure 6 As shown, the rodless chamber 12 and the rod chamber 13 are connected, and the pressure difference between the rodless chamber 12 and the rod chamber 13 gradually decreases, thereby adaptively buffering and reducing the impact force. After the pressure difference on both sides of the piston 2 tends to be balanced, the sealing slider 5 is reset and the first through hole 21 is closed again to wait for the plug rod of the piston 2 to extend again.

[0035] In this embodiment, a sealing slider 5 and a first through hole 21 are provided on the piston 2, and a first drive assembly and a second drive assembly are provided at both ends of the cylinder body 1. Thus, when the piston 2 moves close to the end of its stroke, the first drive assembly and the second drive assembly are utilized to cause the sealing slider 5 to open the first through hole 21, so that the rodless chamber 12 and the rod chamber 13 are connected, reducing the pressure difference on both sides of the piston 2, thereby forming an adaptive buffer and reducing the impact at the end of the stroke of the piston 2. No external control device is required, and the purely mechanical linkage has high structural reliability, which effectively improves the service life and buffering performance of the cylinder.

[0036] like Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, in some embodiments of the present embodiment, the pneumatic valve cylinder with strong buffering performance includes a first driving assembly 31, a second lifting block 32 and a first tension spring 33; the cylinder wall of the cylinder body 1 is provided with a first accommodating groove 16 and a second accommodating groove 17 in series on the first air path 14 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 lifting block 31 is slidably arranged in the first accommodating groove 16; the first tension spring 33 is connected to 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 sealingly slidably arranged in the second accommodating groove 17; the second top block 32 is provided with a second inclined surface; specifically, the second inclined surface is provided with a first arc portion at the end close to the first inclined surface, so that the first top block 31 squeezes the second top block 32 to extend out of the second accommodating groove 17; the first top block 31 can overcome the action of the first tension spring 33 when air is taken into the rod chamber 13, 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 and the piston rod of the piston 2 is retracted inward, the gas in the rod chamber 13 enters the first gas path 14, thereby pushing the first top block 31 to overcome the tension 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 squeezes the second top block 32, so that the second top block 32 protrudes into the rodless chamber 12. In this way, when the piston 2 slides downward to near 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 squeezes the sealing slider 5 to slide, so that the sealing slider 5 slides to open the first through hole 21. Figure 6 As 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 is reduced, thereby reducing the impact at the end of the stroke of the piston 2, which is beneficial to extending the life of the cylinder sealing ring and improving the reliability of the cylinder.

[0038] When the pressure difference on both sides of the piston 2 tends to be balanced, the first tension spring 33 pulls the first top block 31 to return to its original position, releasing the squeeze on the second top block 32, and the sealing slider 5 returns to its original position, and pushes the second top block 32 to return to its original position, thereby closing the first through hole 21. Figure 3 and Figure 4 shown.

[0039] like Figure 1 、 Figure 2 、 Figure 5 and Figure 7As shown, in the embodiment of the pneumatic valve cylinder with strong buffering performance, in some embodiments, the second drive assembly includes a third top block 41, a fourth top block 42 and a second tension spring 43; the cylinder wall in the cylinder body 1 is provided with a third accommodating groove 18 and a fourth accommodating groove 19 in series on the second air path 15 in the rod cavity 13; the third accommodating groove 18 is arranged close to the rodless cavity 12, that is, the third accommodating groove 18 is located at the lower end of the fourth accommodating groove 19; the third top block 41 is slidably arranged in the third accommodating 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 sealingly slidably arranged in the fourth accommodating 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 squeezes the fourth top block 42 to extend out of the fourth accommodating groove 19; the third top block 41 can overcome the action of the second tension spring 43 when air is taken into the rodless chamber 12, and push the fourth top block 42 to protrude out of the fourth accommodating groove 19 through the third inclined surface.

[0040] When the piston 2 slides upward and the plug rod of the piston 2 extends outward, the gas in the rodless chamber 12 enters the second gas path 15, thereby pushing the third top block 41 to overcome the tension of the second tension spring 43 and extend into the fourth accommodating groove 19. Under the action of the third inclined surface, the third top block 41 squeezes the fourth top block 42, so that the fourth top block 42 protrudes into the rod chamber 13. In this way, when the piston 2 slides upward to near 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 squeezes the sealing slider 5 to slide, so that the sealing slider 5 slides to open the first through hole 21. Figure 5 As 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 is reduced, thereby reducing the impact of the piston 2 at the end of the stroke.

[0041] When the pressure difference on both sides of the piston 2 tends to be balanced, the second tension spring 43 pulls the third top block 41 to return to its original position, releasing the squeeze on the fourth top block 42, and the sealing slider 5 returns to its original position, and pushes the fourth top block 42 to return to its original position, thereby closing the first through hole 21. Figure 1 and Figure 2 shown.

[0042] This embodiment realizes an internal self-buffering process without the need for an external control signal by setting up a pressure difference drive + mechanical linkage, which not only ensures the high sealing performance of the cylinder as a whole, but also greatly reduces the impact at the end of the piston 2, which is beneficial to extending the service life of the cylinder. It is suitable for pneumatic valve control occasions with high frequency, high response and high sealing requirements.

[0043] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9As shown, 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 cavity 12 is connected to the rod cavity 13. In this embodiment, by providing 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 overcomes the elastic force of the first spring 6 and retracts, so that the second through hole 51 corresponds to the position of the first through hole 21, thereby connecting the rodless cavity 12 and the rod cavity 13 to reduce the pressure difference on both sides of the piston 2 and achieve a buffering effect; when the pressure difference on both sides of the piston 2 tends to be balanced, 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 the need for an external control signal.

[0044] like Figure 7 As shown, in some embodiments of the pneumatic valve cylinder with strong buffering performance of this embodiment, two first air passages 14 and two second air passages 15 are provided on the cylinder wall of the cylinder body 1. Correspondingly, four first through holes 21 and four sealing sliders 5 are provided on the piston 2. The two sealing sliders 5 correspond one-to-one with the two first air passages 14, and the two sealing sliders 5 correspond one-to-one with the two second air passages 15. This arrangement enhances the self-buffering process within the cylinder body 1 and improves the buffering effect.

[0045] like Figures 1 to 6 As shown, in some embodiments of the pneumatic valve cylinder with strong cushioning performance of this embodiment, cushion pads 7 are respectively provided at both ends of the cylinder body 1. By providing cushion pads 7, this embodiment further enhances the cushioning effect at the end position of the stroke of the piston 2 and further improves the reliability of the cylinder.

[0046] like Figure 8 and Figure 10As shown, in the pneumatic valve cylinder with strong buffering performance of this embodiment, in some embodiments, the plug of the piston 2 is provided with a friction assembly; the friction assembly includes a friction slider 81 and a friction block 82; the friction slider 81 is movable through the plug of the piston 2; the two ends of the friction slider 81 are respectively connected to the plug of the piston 2 with a second spring 83; the friction block 82 is slidably provided on the plug 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 to frictionally 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 to prevent the piston 2 from losing control and thus increasing the impact force due to the pressure relief buffer; when the rodless chamber 12 or the rod chamber 13 is intaken, 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 is intaken, the friction slider 81 slides toward the rod chamber 13, and when the rod chamber 13 is intaken, the friction slider 81 slides toward the rodless chamber 12; during the sliding process of the friction slider 81, the friction block 82 is automatically retracted by the connecting rod 84, thereby reducing the sliding resistance of the piston 2 and improving the feeding efficiency.

[0047] like Figure 8 and Figure 10 As shown, in the embodiment of the pneumatic valve cylinder with strong buffering performance, 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, the two bosses 811 are provided to facilitate the installation of the second spring 83.

[0048] like Figure 8 As shown, in some embodiments of the pneumatic valve cylinder with high cushioning performance of this embodiment, multiple friction assemblies are provided, and the multiple friction assemblies are evenly distributed along the circumference. The sealing sliders 5 are arranged alternately with the friction assemblies. This embodiment enhances the stability of the piston 2 in the pressure relief position by providing multiple friction assemblies distributed along the circumference.

[0049] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A pneumatic valve cylinder with strong buffering performance, characterized in that: It comprises a cylinder body and a piston movably arranged in the cylinder body; the piston divides the cylinder body into a rodless chamber and a rod chamber; the cylinder wall of the cylinder body is provided with at least one first air path and at least one second air path; the two ends of the first air path and the two ends of the second air path are respectively connected to the rodless chamber and the rod chamber; each of the first air paths is sealed with a first drive assembly in the rodless chamber; each of the second air paths is sealed with a second drive assembly in the rod chamber; The plug part of the piston is respectively provided with a first through hole corresponding to each first air path and each second air path; the plug part of the piston is respectively provided with a sealing slider movably 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 path can, under the drive of the first driving component, enable the corresponding first through hole to connect the rodless cavity and the rod cavity; the sealing slider corresponding to the second air path can, under the drive of the second driving component, enable the corresponding first through hole to connect the rodless cavity and the rod cavity.

2. A pneumatic valve cylinder with strong buffering performance according to claim 1, characterized in that: The first driving assembly includes a first top block and a second top block; the cylinder wall of the cylinder body is provided with a first accommodating groove and a second accommodating groove connected in series with the first air path in the rodless chamber; the first accommodating groove is arranged close to the rod chamber; the first top block is slidably arranged in the first accommodating 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 sealingly slidably arranged in the second accommodating groove; the second top block is provided with a second inclined surface; the first top block can overcome the action of the first tension spring when air is taken into the rod chamber, and push the second top block to protrude out of the second accommodating groove through the first inclined surface.

3. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that: The second driving assembly includes a third top block and a fourth top block; the cylinder wall in the cylinder body is provided with a third accommodating groove and a fourth accommodating groove in series in the rod chamber, which are connected to the second air path; the third accommodating groove is arranged close to the rodless chamber; the third top block is slidably arranged in the third accommodating 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 sealingly slidably arranged in the fourth accommodating groove; the fourth top block is provided with a fourth inclined surface; the third top block can overcome the action of the second tension spring when air is taken into the rodless chamber, and push the fourth top block to protrude out of the fourth accommodating groove through the third inclined surface.

4. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that: 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.

5. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that: The cylinder wall in the cylinder body is provided with two oppositely arranged first gas paths and two oppositely arranged second gas paths.

6. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that: Buffer pads are respectively provided at both ends of the cylinder body.

7. The cylinder for a pneumatic valve with strong buffering performance according to claim 1, characterized in that: The plug of the piston is provided with a friction assembly; the friction assembly includes a friction slider and a friction block; the friction slider is movable through the plug of the piston; a second spring is connected between the two ends of the friction slider and the plug of the piston respectively; the friction block is slidably provided on the plug of the piston; a connecting rod is hinged between the friction block and the friction slider.

8. The cylinder for a pneumatic valve with strong buffering performance according to claim 7, characterized in that: The friction sliding block is symmetrically provided with two bosses; the second spring is connected to the bosses.

9. The cylinder for a pneumatic valve with strong buffering performance according to claim 7, characterized in that: There are multiple friction components, and the multiple friction components are evenly distributed along the circumferential direction; the sealing sliders and the friction components are alternately arranged at intervals.

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