Automatic reciprocating cylinder

Abstract

The utility model discloses an automatic reciprocating cylinder. The automatic reciprocating cylinder comprises a control valve, a cylinder main body and a reversing valve, the reversing valve is arranged outside the air cylinder body and used for injecting gas into the front cavity or the rear cavity of the air cylinder body so that the air cylinder can reciprocate. The control valve comprises a valve element and a reset spring. The control valve is used for controlling the reversing valve to reverse; the valve element and the reset spring are arranged in a cavity formed in an end cover of the air cylinder body. One end of the reset spring abuts against the valve element, and the other end of the reset spring abuts against the inner wall of the cavity. An air cavity is formed in the cavity; and the air cavity is used for introducing compressed air to push the valve core to reset. Through innovative combination of a pneumatic structure and a mechanical structure, the problems that a traditional automatic reciprocating air cylinder is low in reliability, frequent in maintenance and the like due to dependence of a spring are solved, system durability, control precision and environmental adaptability are remarkably improved, and the automatic reciprocating air cylinder has outstanding industrial application value.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic technical field especially relates to a kind of automatic reciprocating cylinder. BACKGROUND

[0002] The existing automatic reciprocating cylinder, control valve with spring can be used to control the reversing valve reversing. Its basic principle is that in the process of piston rod, piston and control valve contact, spring is retracted and reset accordingly, and the control valve controls the reversing valve reversing accordingly, so that the cylinder can be alternately supplied with gas to the front cavity or the rear cavity, so that the cylinder realizes automatic reciprocating motion. Therefore, whether the spring set in the control valve can be flexibly stretched and retracted is a key factor to realize the reversing of the reversing valve.

[0003] After the control valve is used for a long time, with the wear of its internal parts and the possible impurities inside, the control valve will inevitably increase the friction resistance. When the spring force is not enough to overcome the gradually increasing friction resistance in the process of retraction and reset, the control valve will malfunction, causing the reversing valve to fail to reverse. In addition, the decrease in elasticity caused by fatigue damage of the spring during long-term use is also inevitable, which will cause the sensitivity of the control valve to decrease, and the cylinder to reciprocate unsmoothly or even the reversing valve to fail to reverse. SUMMARY

[0004] In view of the above problems, the purpose of the utility model is to provide an automatic reciprocating cylinder.

[0005] In the first aspect, the utility model embodiment provides an automatic reciprocating cylinder, which comprises:

[0006] control valve, cylinder body and reversing valve;

[0007] The reversing valve is arranged outside the cylinder body and is used to inject gas into the front cavity or the rear cavity of the cylinder body, so that the cylinder reciprocates;

[0008] The control valve comprises a valve core and a reset spring; the control valve is used to control the reversing of the reversing valve;

[0009] The valve core and the reset spring are arranged in a cavity formed in the end cover of the cylinder body; one end of the reset spring abuts against the valve core, and the other end abuts against the inner wall of the cavity;

[0010] The cavity comprises a gas cavity; the gas cavity is used to introduce compressed air to reset the valve core.

[0011] In one embodiment, the control valve further comprises a valve sleeve;

[0012] The valve sleeve is sleeved outside the valve core;

[0013] The space of the valve sleeve not wrapping the valve core is the air cavity;

[0014] The air cavity is communicated with the external air source through the first channel arranged in the end cover.

[0015] In an embodiment, the end cover comprises a front end cover and a rear end cover;

[0016] The second channel communicating with the reversing valve and the third channel communicating with the external atmosphere are further arranged in the end cover.

[0017] In an embodiment, the valve sleeve is arranged with a first groove, a second groove and a third groove at intervals;

[0018] The first groove is arranged with a plurality of first main air holes communicating with the first channel; the first main air holes are used for communicating with the air cavity when the valve core is in the reset state during the reciprocating movement of the air cylinder;

[0019] The second groove is arranged with a second air hole communicating with the second channel;

[0020] The third groove is arranged with a third air hole communicating with the third channel.

[0021] In an embodiment, the valve core is arranged with a fourth groove;

[0022] The fourth groove is used for conducting the second air hole and the third air hole when the valve core is in the reset state during the reciprocating movement of the air cylinder;

[0023] And conducting the first main air hole and the second air hole when the valve core is in the compression state during the reciprocating movement of the air cylinder.

[0024] In an embodiment, the valve core is arranged with a wear-resistant ring;

[0025] The first groove is further arranged with a plurality of first auxiliary air holes communicating with the first channel;

[0026] The plurality of first main air holes and the plurality of first auxiliary air holes are arranged side by side on the first groove.

[0027] In an embodiment, further comprising: a gas distribution block;

[0028] The gas distribution block is arranged outside the air cylinder body;

[0029] The gas distribution block is respectively communicated with the air source, the first channel, the second channel, the third channel, the reversing valve and the external atmosphere.

[0030] In an embodiment, the reversing valve is arranged above the gas distribution block;

[0031] The reversing valve is a two-position five-way electromagnetic valve.

[0032] In one embodiment, further comprising:

[0033] The first sealing ring arranged on the valve core between the fourth groove and the wear-resistant ring.

[0034] In one embodiment, further comprising:

[0035] The plurality of second sealing rings arranged on the valve core and the valve sleeve.

[0036] The beneficial effects of the above technical solutions provided by the embodiments of the utility model at least include:

[0037] The utility model discloses an automatic reciprocating cylinder, through the gas cavity of adding in the rear end of control valve and the compression air of passing, forms the stable pneumatic thrust and resets the valve core, effectively replaces the single mode of traditional dependence spring force. The pneumatic thrust does not decay because of long -term use, avoids the elasticity decline problem of spring because of fatigue or friction resistance increase, thereby reduces the risk of control valve failure greatly, significantly improves the reliability of control valve and ensures the long -term stability of reversing action of reversing valve. Reset spring is only used for the valve core positioning of initial state when not passing the compression air in the gas cavity, and its action range is limited, avoids the fatigue failure of cylinder caused by long -term reciprocating compression.

[0038] Further, the multi-channel gas path design (such as the first channel, the second channel and the third channel), and the coordinated action of the fourth groove on the valve core with the first groove, the second groove and the third groove on the valve sleeve during movement, can realize the dynamic conduction or closure of different gas paths of the valve core in different movement states, can realize the accurate distribution of airflow, and the quick response of the reversing valve.

[0039] Further, the first auxiliary gas hole is additionally arranged on the valve sleeve, which solves the problem of poor gas path caused by the wear-resistant ring, effectively improves the sensitivity of the control valve in controlling the reversing of the reversing valve and the fluency of the reciprocating motion of the cylinder, and optimizes the system response accuracy and efficiency.

[0040] Further, the combination of the two-position five-way electromagnetic valve and the gas distribution block optimizes the gas source utilization rate, and can realize efficient reciprocating operation of the cylinder.

[0041] Further, the wear-resistant ring and the plurality of sealing rings are arranged, which ensures the tightness during the ventilation of different gas paths, reduces the friction loss between the valve core and the valve sleeve during the working process of the control valve, and also prevents impurities in the external adverse environment from invading the gas path system, thereby enhancing the environmental applicability and reducing the maintenance cost.

[0042] In conclusion, the automatic reciprocating cylinder of the utility model solves the problems of low reliability and frequent maintenance caused by spring dependence of traditional automatic reciprocating cylinder, significantly improves the system durability, control accuracy and environmental adaptability, and has outstanding industrial application value.

[0043] Other features and advantages of the present utility model will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present utility model. The objects and other advantages of the present utility model can be realized and achieved by means of the structures particularly pointed out in the written description, claims, and accompanying drawings.

[0044] The technical scheme of the present utility model will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0045] The accompanying drawings are included to provide a further understanding of the present utility model, and constitute a part of the specification, and are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation on the present utility model. In the drawings:

[0046] Figure 1 It is an appearance view of the automatic reciprocating cylinder in the embodiments of the present utility model;

[0047] Figure 2 It is a structure sectional view of the automatic reciprocating cylinder in the embodiments of the present utility model;

[0048] Figure 3 It is an enlarged view of the control valve on the front end cover in the embodiments of the present utility model;

[0049] Figure 4 It is a valve sleeve schematic view in the embodiments of the present utility model;

[0050] Figure 5 It is a valve core schematic view in the embodiments of the present utility model.

[0051] BRIEF DESCRIPTION OF DRAWINGS

[0052] 1, control valve; 2, reversing valve; 3, cylinder barrel; 4, piston; 5, piston rod; 6, front end cover; 7, rear end cover; 8, gas distribution block;

[0053] 101, valve core; 102, reset spring; 103, valve cover; 104, first groove; 105, second groove; 106, third groove; 107, first main gas hole; 108, second gas hole; 109, third gas hole; 110, fourth groove; 111, wear-resistant ring; 112, first auxiliary gas hole; 113, first sealing ring; 114, sealing ring A; 115, sealing ring B; 116, sealing ring C; 117, sealing ring D; 118, sealing ring E; 119, sealing ring F; 120, sealing ring G; 121, mounting screw. DETAILED DESCRIPTION

[0054] The present embodiment provides an automatic reciprocating air cylinder, although the drawings show exemplary embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] The present embodiment provides an automatic reciprocating air cylinder, as shown in Figure 1 , Figure 2 and Figure 3 , comprising:

[0056] Control valve 1, cylinder body and reversing valve 2;

[0057] The reversing valve 2 is arranged outside the cylinder body, which is used for injecting gas into the front cavity or rear cavity of the cylinder body, so that the cylinder reciprocates;

[0058] The control valve 1 comprises a valve core 101 and a reset spring 102; the control valve 1 is used for controlling the reversing of the reversing valve 2;

[0059] The valve core 101 and the reset spring 102 are arranged in the cavity formed in the end cover of the cylinder body; one end of the reset spring 102 abuts against the valve core 101, and the other end abuts against the inner wall of the cavity;

[0060] The cavity comprises a gas cavity; the gas cavity is used for introducing compressed air to push the valve core 101 to reset.

[0061] The utility model embodiment provides a kind of automatic reciprocating cylinder, by adding air cavity and passing into compressed air in control valve 1 rear end, form stable pneumatic thrust to reset valve core 101, effectively replace traditional single mode depending on spring force.The pneumatic thrust will not attenuate due to long-term use, avoid the problem of elasticity decline caused by fatigue or friction resistance increase of spring, to significantly improve the reliability of control valve 1 and ensure the long-term stability of reversing valve 2 reversing action.The reset spring 102 is only used for the valve core 101 positioning in initial state when compressed air is not passed into in air cavity, its range of action is limited, avoid fatigue failure caused by long-term reciprocating compression.

[0062] In one embodiment, referring to Figure 2 The cylinder body includes end cap, cylinder barrel 3, piston 4 and piston rod 5; Specifically, the end cap includes front end cap 6 and rear end cap 7, respectively connected to the cylinder barrel 3. The piston 4 is arranged in the cylinder barrel 3 and connected with the piston rod 5, and the piston rod 5 can reciprocate together with the piston 4. During the movement, the cylinder barrel 3 is divided into front and rear cavities by the piston 4. The piston rod 5 extends out of the cylinder, for example, through the front end cap 6, and the piston rod 5 is provided with a rod seal ring and a bushing on the contact surface with the front end cap 6. The end surface of the piston 4 in contact with the cylinder barrel 3 is provided with a piston seal ring and a piston wear ring. A pull rod is arranged between the two end caps and fastened by a pull rod nut.

[0063] In one embodiment, referring to Figure 2 The reversing valve 2 is arranged outside the cylinder body and can inject gas into the front or rear cavity of the cylinder body through, for example, a channel formed in the cylinder body, so as to compress the piston 4 and drive the piston rod 5 to reciprocate under the action of gas pressure.

[0064] In one embodiment, referring to Figure 2 And Figure 3 The control valve 1 further includes a valve sleeve; the valve sleeve is sleeved outside the valve core 101; the space of the valve sleeve not wrapping the valve core 101 is an air cavity; the air cavity is communicated with the external gas source through a first channel arranged in the end cap.

[0065] In one embodiment, referring to Figure 2 And Figure 3 The control valve 1 further includes a valve cover 103; the valve cover 103 is fixed on the end cap by a mounting screw 121.

[0066] In one embodiment, referring to Figures 2 to 5, the valve sleeve is a hollow cylinder, the valve core 101 is a variable cross-section cylinder, the valve core 101 has a valve core head, and a valve core cavity is arranged in the valve core 101. The valve sleeve is arranged in the cavity arranged in the end cover, the valve core 101 is movably sleeved in the valve sleeve, and the valve core head of the valve core 101 can extend into the front cavity or the rear cavity of the cylinder body or the cylinder barrel 3 through one end of the valve sleeve. The end of the valve core 101 away from the valve core head forms an air cavity with the inner wall of the cavity in the end cover (namely the inner wall of the valve cover 103). Part of the reset spring 102 is sleeved in the valve core cavity, and the other part is located in the air cavity. With the reset or contraction of the valve core 101, the size of the air cavity also changes. The first channel can continuously inject compressed air into the air cavity through an external air source.

[0067] In one embodiment, the front end cover 6 and the rear end cover 7 are further provided with a second channel communicating with the reversing valve 2 and a third channel communicating with the external atmosphere.

[0068] In one embodiment, during the reciprocating movement of the air cylinder, the valve core 101 has two movement states, namely a compression state and a reset state. The compression state refers to that after the piston 4 abuts against the valve core head, the piston 4 continues to move the valve core 101, the valve core head gradually retracts into the cavity of the front end cover 6 or the rear end cover 7, and the reset spring 102 is compressed. The reset state refers to that the piston 4 gradually moves away from the valve core 101 until the piston 4 is out of contact with the valve core head, the valve core head gradually extends from the cavity to the front cavity or the rear cavity, and the reset spring 102 is gradually elongated.

[0069] In one embodiment, referring to Figure 3 and Figure 4 , the valve sleeve is provided with a first groove 104, a second groove 105 and a third groove 106 at intervals; the first groove 104 is provided with a plurality of first main air holes 107 communicating with the first channel; the first main air hole 107 is used for communicating with the air cavity when the valve core 101 is in the reset state during the reciprocating movement of the air cylinder; the second groove 105 is provided with a second air hole 108 communicating with the second channel; and the third groove 106 is provided with a third air hole 109 communicating with the third channel.

[0070] In one embodiment, referring to Figures 3 to 5 , the valve core 101 is provided with a fourth groove 110; the fourth groove 110 is used for conducting the second air hole 108 and the third air hole 109 when the valve core 101 is in the reset state during the reciprocating movement of the air cylinder, and conducting the first main air hole 107 and the second air hole 108 when the valve core 101 is in the compression state during the reciprocating movement of the air cylinder.

[0071] In one embodiment, referring to Figures 2 to 5For example, the control valve 1 on the front cover 6, the valve core 101 is in the limit state of reset state, which is the initial state of the valve core 101 at the beginning. At this time, the cavity of the front cover 6 is communicated with the first channel through the first main gas hole 107 on the first groove 104 of the valve sleeve, and the external gas source continuously injects compressed air into the cavity through the first channel. In addition, the second gas hole 108 and the third gas hole 109 are also communicated. Start the reversing valve 2. If the reversing valve 2 injects gas into the rear cavity of the cylinder barrel 3, the piston 4 gradually approaches the front cover 6 and contacts the valve core head, and then continues to move the valve core 101 to the cavity of the front cover 6. At this time, the valve core 101 is in the compression state, and the second gas hole 108 is gradually communicated with the third gas hole 109 through the movement of the fourth groove 110. The second gas hole 108 is gradually communicated with the first main gas hole 107, and the first main gas hole 107 is gradually not communicated with the cavity. Therefore, the external gas source can pass through the first channel, the first main gas hole 107, the fourth groove 110, the second gas hole 108 and the second channel to the reversing valve 2, thereby controlling the reversing of the reversing valve 2. After the reversing of the reversing valve 2, the gas is injected into the front cavity of the cylinder barrel 3, and the piston 4 moves to the rear cover 7 and gradually separates from the valve core head. At this time, the valve core 101 is in the reset state, and the first main gas hole 107 is gradually not communicated with the second gas hole 108 through the movement of the fourth groove 110. The second gas hole 108 is gradually communicated with the third gas hole 109, and the first main gas hole 107 is gradually communicated with the cavity in the front cover 6. Therefore, the external gas source re-injects compressed air into the cavity through the first channel and the first main gas hole 107, and the original injected gas in the second channel can be released through the third channel. Because there is a large area difference between the front and rear ends of the valve core 101, a large pushing force can be formed at the rear end of the valve core 101, so that the valve core head gradually extends out of the front cover 6, and the reset spring 102 is gradually elongated, which can assist the reset of the valve core 101. In the process of gradually contacting the control valve 1 on the rear cover 7 by the piston 4, the state change of the valve core 101 and the process of controlling the displacement of the reversing valve 2 are the same as described above, and will not be described again. It can be seen that the continuous injection of compressed air in the cavity can form a continuous pushing force at the rear end of the valve core 101. The pushing force source comes from the external gas source, and the specific stability and constant advantage remains unchanged during the working process, which is the main power source for the reset of the valve core 101. The reset spring 102 plays a role in assisting the reset of the valve core 101.

[0072] In one embodiment, with reference to Figure 3 , Figure 4 and Figure 5The valve core 101 is provided with a wear-resistant ring 111; the first recess 104 is further provided with a plurality of first auxiliary gas holes 112 communicating with the first channel; the first auxiliary gas hole 112 is used for communicating with the second gas hole 108 through the fourth recess 110 when the valve core 101 is in the contraction state during the reciprocating movement of the cylinder; the plurality of first main gas holes 107 and the plurality of first auxiliary gas holes 112 are arranged side by side on the first recess 104. Specifically, for example, the wear-resistant ring 111 is arranged between the fourth recess 110 and the end face of the valve core 101 away from the valve core head. Because the wear-resistant ring 111 is arranged, when the valve core 101 is in the compression state, the conduction of the first main gas hole 107 and the second gas hole 108 may be blocked or the gas flow communication may be poor, so a plurality of first auxiliary gas holes 112 are arranged on the first recess 104 of the valve sleeve, which can effectively conduct the second gas hole 108 and the first channel. In addition, in order to further ensure sufficient and smooth gas flow, the first main gas hole 107 and the first auxiliary gas hole 112 are both a plurality of and arranged side by side in a ring on the first recess 104.

[0073] In one embodiment, with reference to Figure 2 The automatic reciprocating cylinder further comprises a gas distribution block 8; the gas distribution block 8 is arranged outside the cylinder body; the gas distribution block 8 is in communication with the gas source, the first channel, the second channel, the third channel, the reversing valve 2 and the external atmosphere respectively. Specifically, the gas distribution block 8 is arranged above the cylinder body, and the gas distribution block 8 can effectively manage and distribute the gas, so that the cylinder runs more efficiently.

[0074] In one embodiment, with reference to Figure 2 The reversing valve 2 is arranged above the gas distribution block 8; the reversing valve 2 is a two-position five-way electromagnetic valve.

[0075] In one embodiment, with reference to Figures 3 to 5 The automatic reciprocating cylinder further comprises a first sealing ring 113; the first sealing ring 113 is arranged on the valve core 101 between the fourth recess 110 and the wear-resistant ring 111. Specifically, for example, the first sealing ring 113 can better seal the gas flow connection between the first main gas hole 107, the first auxiliary gas hole 112 and the second gas hole 108 during the resetting process of the valve core 101, and ensure the precision of the reversing function of the reversing valve 2.

[0076] In one embodiment, with reference to Figure 2 and Figure 3The automatic reciprocating cylinder further comprises a plurality of second sealing rings, each of which is arranged on the valve core 101 and the valve sleeve. The sealing rings include sealing ring A 114, sealing ring B 115, sealing ring C 116, sealing ring D 117, sealing ring E 118, sealing ring F 119 on the valve sleeve, and sealing ring G 120 on the valve core 101. The arrangement of these sealing rings can effectively ensure the air tightness between the control valve 1 itself, the control valve 1 and the front end cover 6 and the rear end cover 7, and the control valve 1 and the front cavity and the rear cavity.

[0077] The working principle of the automatic reciprocating cylinder will be briefly described below through an example. For example, referring to Figure 2 and Figure 3 When the compressed air is introduced into the P port (communicated with the air source, not shown in the figure) of the gas distribution block 8, the compressed air enters the A port (not shown in the figure) of the reversing valve 2, and then enters the front cavity of the cylinder barrel 3 through the channel arranged in the front end cover 6, thereby pushing the piston 4 to move towards the rear end cover 7. When the piston 4 moves to contact the valve core 101 of the control valve 1, the valve core 101 is pushed to retract. After the valve core 101 retracts, the compressed air from the air source is communicated with the gas path of the reversing valve core in the reversing valve 2, and the compressed air pushes the reversing valve 2 to reverse. At this time, the compressed air in the P port enters the B port (not shown in the figure) of the reversing valve 2, and then enters the rear cavity of the cylinder barrel 3, thereby pushing the piston 4 to move towards the front end cover 6.

[0078] When the piston 4 moves away from the rear end cover 7 and gradually separates from the valve core 101 on the rear end cover, the valve core 101 gradually extends into the cylinder barrel 3 under the pushing force of the compressed air in the gas cavity. At this time, the compressed air is disconnected with the gas path of the reversing valve 2, and the gas path in the reversing valve 2 is communicated with the atmosphere, so that the gas in the reversing valve 2 is discharged to the atmosphere. When the piston 4 continues to move to contact the control valve 1 on the front end cover 6, the valve core 101 on the front end cover is pushed to retract, the compressed air is communicated with the reversing valve 2, the reversing valve 2 is reversed, and the compressed air is introduced into the A port of the reversing valve 2 through the P port of the gas distribution block 8 again. Thus, the automatic reciprocating movement of the cylinder is continuously cycled.

[0079] Obviously, those skilled in the art can make various changes to the utility model without departing from the spirit and scope of the utility model. Therefore, if these modifications of the utility model belong to the scope of the claims of the utility model and its equivalent technologies, the utility model also intends to include these modifications.

Claims

1. An automatic reciprocating cylinder characterized by, The utility model relates to a control valve, a cylinder body and a reversing valve, and relates to a cylinder control system. The reversing valve is arranged outside the cylinder body and is used to inject gas into the front cavity or the rear cavity of the cylinder body to make the cylinder reciprocate. The control valve comprises a valve core and a reset spring, and is used to control the reversing of the reversing valve. The valve core and the reset spring are arranged in a cavity formed in an end cover of the cylinder body, one end of the reset spring abuts against the valve core, and the other end abuts against the inner wall of the cavity. The cavity comprises a gas cavity, and the gas cavity is used to introduce compressed air to push the valve core to reset. The control valve further comprises a valve sleeve.

2. The air cylinder of claim 1, wherein, The valve sleeve is sleeved on the outside of the valve core. The space of the valve sleeve that does not wrap the valve core is the gas cavity. The gas cavity is communicated with an external gas source through a first channel arranged in the end cover. The end cover comprises a front end cover and a rear end cover.

3. The air cylinder of claim 2, wherein, The end cover further comprises a second channel that is communicated with the reversing valve and a third channel that is communicated with the external atmosphere. The valve sleeve is spaced apart and comprises a first groove, a second groove and a third groove.

4. The air cylinder of claim 3, wherein, The first groove is provided with a plurality of first main air holes that are communicated with the first channel, and the first main air holes are used to communicate with the gas cavity when the valve core is in a reset state during the reciprocation of the cylinder. The second groove is provided with a second air hole that is communicated with the second channel. The third groove is provided with a third air hole that is communicated with the third channel. The valve core is provided with a fourth groove.

5. The air cylinder of claim 4, wherein, The fourth groove is used to guide the second air hole and the third air hole when the valve core is in a reset state during the reciprocation of the cylinder, and is used to guide the first main air hole and the second air hole when the valve core is in a compression state during the reciprocation of the cylinder. The valve core is provided with a wear-resistant ring. The first groove is further provided with a plurality of first auxiliary air holes that are communicated with the first channel.

6. The air cylinder of claim 5, wherein, The plurality of first main air holes and the plurality of first auxiliary air holes are arranged side by side on the first groove. The utility model further comprises a gas distribution block. The gas distribution block is arranged outside the cylinder body.

7. The air cylinder of claim 6, wherein, The gas distribution block is communicated with the gas source, the first channel, the second channel, the third channel, the reversing valve and the external atmosphere, respectively. The reversing valve is arranged above the gas distribution block. The reversing valve is a two-position five-way electromagnetic valve. The valve core is provided with a first sealing ring between the fourth groove and the wear-resistant ring.

8. The air cylinder of claim 7, wherein, The valve core and the valve sleeve are provided with a plurality of second sealing rings. ​ 9. The air cylinder of claim 8, wherein, ​ ​ 10. The air cylinder of claim 9, wherein, ​ ​

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