Air cylinder with front end lock

Abstract

The invention relates to an air cylinder with a front end lock and belongs to the technical field of air cylinder production, the air cylinder comprises a cylinder barrel and a piston rod arranged in the cylinder barrel, a front end cover and a rear end cover are arranged at the two ends of the cylinder barrel respectively, and a supporting cover is arranged at the end, away from the cylinder barrel, of the front end cover. The locking piston is arranged in the supporting cover, a locking assembly is arranged between the locking piston and the piston rod, a first containing cavity is formed between the locking piston and the front end cover, and a reset spring is arranged at the end, away from the first containing cavity, of the locking piston. The front end cover, the cylinder barrel and the rear end cover are provided with communicated ventilation channels, and the ventilation channels are communicated with the first containing cavity, so that the locking piston unlocks or locks the locking assembly through air pressure penetrating through the ventilation channels. The front end lock has the effect that the situation that the piston rod is prone to being blocked in the front end lock unlocking process can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of cylinder production, and in particular to a cylinder with a front lock. Background Art

[0002] With the continuous development of automation technology and the continuous increase of labor costs, mechanical equipment will inevitably develop towards high speed, high efficiency and full automation. The realization of automation is inseparable from electric, pneumatic and other actuators. The cylinder is the most common pneumatic actuator. A common cylinder generally consists of a cylinder barrel, end covers, a piston, a piston rod, sealing rings, etc., and can perform linear reciprocating motion. On this basis, by adding a set of locking components and a positioning and detection component, the piston can be locked at a specific position. Currently, cylinders with locking components usually extend and retract the piston rod and unlock the locking components at the same time. For this type of cylinder structure, the piston rod often has a slight camming first, especially when the load is applied and the direction of the load force is the same as the direction of cylinder contraction. In this case, the tensile force generated by the air pressure acting on the front chamber of the cylinder and the load force will ultimately act on the front lock, resulting in an increase in the unlocking force of the cylinder, and thus causing the cylinder to jam or even fail to unlock during unlocking. Summary of the Utility Model

[0003] In order to solve the problem that the piston rod is prone to jamming during the unlocking of the front lock, the present application provides a cylinder with a front lock.

[0004] A cylinder with a front lock provided by the present application adopts the following technical solution:

[0005] A cylinder with a front lock includes a cylinder barrel and a piston rod disposed inside the cylinder barrel. Front end covers and rear end covers are respectively provided at both ends of the cylinder barrel. A support cover is provided at one end of the front end cover facing away from the cylinder barrel. A locking piston is provided at one end of the piston rod passing through the front end cover. The locking piston is disposed inside the support cover. A locking component is provided between the locking piston and the piston rod. A first cavity is provided between the locking piston and the front end cover. A return spring is provided at one end of the locking piston facing away from the first cavity. The front end cover, the cylinder barrel and the rear end cover are provided with a communicating air passage, and the air passage is communicated with the first cavity, so that the locking piston unlocks or locks the locking component through the air pressure passing through the air passage.

[0006] By adopting the above technical scheme, a locking piston is provided at the end of the piston rod passing through the front end cover, a locking assembly is provided between the locking piston and the piston rod, a first cavity is provided between the locking piston and the front end cover, and a return spring is provided at the end of the locking piston away from the first cavity. A connected ventilation channel is provided at the front end cover, the cylinder barrel and the rear end cover, and the ventilation channel is connected to the first cavity, so that the locking piston unlocks or locks the locking assembly through the air pressure passing through the ventilation channel. When the compressed air in the first cavity is discharged through the ventilation channel, the locking piston moves toward the front end cover under the action of the return spring to lock the locking assembly. When the ventilation channel is connected to the compressed gas and reaches the first cavity, the locking piston moves in the direction away from the front end cover, and the locking piston unlocks the locking assembly, so that there is no need for manual operation, and the locking assembly can be unlocked or locked only by the air pressure difference, which is conducive to first unlocking the locking assembly and then extending and retracting the piston rod, so that the piston rod is not prone to jamming.

[0007] Optionally, the locking assembly includes a locking pin arranged at one end of the piston rod passing through the front end cover, the locking member is provided with a plurality of equally spaced through holes, locking steel balls for locking the piston rod are placed in the through holes, and the locking piston is provided with a lending groove for the locking steel balls to unlock the piston rod.

[0008] By adopting the above technical solution, a locking pin is provided at one end of the piston rod passing through the front end cover, and a plurality of equidistantly distributed through holes are provided on the locking pin. A locking steel ball for locking the piston rod is placed in the through hole, and a lending groove for the locking steel ball to unlock the piston rod is provided at the locking piston. When the lending groove is aligned with the locking steel ball, the locking steel ball can move in the direction of the lending groove, so that the locking steel ball unlocks the piston rod, which is conducive to the movement or retraction of the locking piston in the direction of the front end cover.

[0009] Optionally, the piston rod is provided with annular grooves on the side walls of the front end cover and the rear end cover for engaging with the locking steel balls.

[0010] By adopting the above technical solution, annular grooves that engage with locking steel balls are provided on the side walls of the piston rod located at the front cover and the rear cover. The locking steel balls engage with the annular grooves, which is conducive to locking or unlocking the piston rod.

[0011] Optionally, the ventilation channel includes a first air inlet and a first channel connected to each other and arranged on the rear end cover, a second channel extending along the length direction of the cylinder barrel, and a third channel arranged on the front end cover, and the third channel is connected to the first cavity.

[0012] By adopting the above technical solution, a first air inlet and a first channel are provided on the rear end cover, a second channel extending along the length direction of the cylinder barrel, and a third channel provided on the front end cover, and the third channel is communicated with the first cavity, and the first channel, the second channel and the third channel are also communicated with each other, so that the compressed air passing through the first channel, the second channel and the third channel can reach the first cavity, which is beneficial to generating a pressure difference in the first cavity.

[0013] Optionally, the ventilation channel further includes a fourth channel connected and communicated between the locking piston and the locking pin and communicated with the first cavity, a fifth channel provided on the locking pin, a sixth channel provided between the locking pin and the piston rod, a seventh channel provided between the front end cover and the piston rod, and a ventilation groove provided at one end of the front end cover facing away from the first cavity, and the ventilation groove is communicated with the inside of the cylinder barrel.

[0014] By adopting the above technical solution, a fourth channel is provided between the locking piston and the locking pin, a fifth channel provided on the locking pin, a sixth channel provided between the locking pin and the piston rod, a seventh channel provided between the front end cover and the piston rod, and a ventilation groove provided at one end of the front end cover facing away from the first cavity, and the fourth channel is communicated with the first cavity, and the ventilation groove is communicated with the inside of the cylinder barrel, which is beneficial to generating a pressure difference in the first cavity.

[0015] Optionally, a first sealing member is provided at the side wall where the locking pin abuts against the locking piston, and the first sealing member is provided behind the fifth channel and located in the first cavity.

[0016] By adopting the above technical solution, a first sealing member is provided at the side wall where the locking pin abuts against the locking piston, and the first sealing member is provided behind the fifth channel and located in the first cavity, so that before the piston rod is unlocked, the gas can be prevented from entering under the action of the first sealing member, thereby realizing that the cylinder is unlocked first and then operates, which is beneficial to preventing the cylinder from jamming when unlocking.

[0017] Optionally, a second sealing member is provided between the locking piston and the supporting cover.

[0018] By adopting the above technical solution, a second sealing member is provided between the locking piston and the supporting cover, so that the compressed air is not easily spilled from the abutting portion between the locking piston and the supporting cover, which is beneficial to improving the sealing performance.

[0019] Optionally, the ventilation channel further includes a second air inlet provided on the rear end cover and an eighth channel connected and communicated with each other.

[0020] Optionally, a piston is provided at one end of the piston rod close to the rear end cover, and a second cavity is provided between the piston and the rear end cover, and the second cavity is communicated with the eighth channel.

[0021] By adopting the above technical solution, a piston is provided at one end of the piston rod close to the rear end cover. A second cavity is provided between the piston and the rear end cover, and the second cavity is communicated with the eighth channel. The second air inlet is also communicated with the eighth channel, so that the compressed gas passing through the second air inlet and the eighth channel reaches the second cavity, which is beneficial to generating a pressure difference in the second cavity, thereby pushing the piston to move.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. A locking piston is provided at one end of the piston rod passing through the front end cover. A locking assembly is provided between the locking piston and the piston rod. A first cavity is provided between the locking piston and the front end cover. A return spring is provided at one end of the locking piston facing away from the first cavity. A communicating ventilation channel is provided in the front end cover, the cylinder barrel and the rear end cover, and the ventilation channel is communicated with the first cavity, so that the locking piston unlocks or locks the locking assembly through the air pressure passing through the ventilation channel. When the compressed air in the first cavity is discharged through the ventilation channel, the locking piston moves towards the front end cover under the action of the return spring to lock the locking assembly. When the ventilation channel is connected to the compressed gas to reach the first cavity, the locking piston moves away from the front end cover, and the locking piston unlocks the locking assembly, so that it is not necessary to manually unlock or lock the locking assembly only through the air pressure difference, which is beneficial to unlocking the locking assembly first and then telescoping the piston rod, so that the piston rod is not prone to jamming.

[0024] 2. A locking pin is provided at one end of the piston rod passing through the front end cover. A plurality of through holes are provided in the locking pin at equal intervals, and locking steel balls for locking the piston rod are placed in the through holes. A lending groove for the locking steel balls to unlock the piston rod is provided at the locking piston. When the lending groove is aligned with the locking steel balls, the locking steel balls can move towards the lending groove, so that the locking steel balls unlock the piston rod, which is beneficial to the locking piston moving towards the front end cover or retracting.

[0025] 3. An annular groove for engaging with the locking steel balls is provided on the side wall of the piston rod between the front end cover and the rear end cover. The locking steel balls are engaged with the annular groove, which is beneficial to locking or unlocking the piston rod. Description of the Drawings

[0026] Figure 1 is a cross-sectional view of the overall structure in the embodiment of the present application.

[0027] Figure 2 is a partial structural schematic diagram of the front end of the cylinder in the embodiment of the present application.

[0028] Figure 3It is a schematic diagram of the explosion structure at the front end of the cylinder in the embodiment of the present application.

[0029] Figure 4 It is Figure 3 a schematic diagram of the structure of part A in

[0030] Figure 5 It is a partial schematic diagram of the rear end of the cylinder in the embodiment of the present application.

[0031] Figure 6 It is a schematic diagram of the structure of the front end cover in the embodiment of the present application.

[0032] Figure 7 It is Figure 2 a schematic diagram of the structure of part B in

[0033] Figure 8 It is Figure 1 a schematic diagram of the structure of part C in

[0034] Explanation of reference numerals: 1, cylinder barrel; 11, piston rod; 111, piston; 112, annular groove; 12, front end cover; 121, first convex block; 122, limiting ring block; 13, rear end cover; 131, second convex block; 14, support cover; 141, locking piston; 1411, second seal; 1412, lending groove; 142, return spring; 15, second cavity; 16, third cavity; 17, first cavity; 2, locking assembly; 21, locking pin; 211, limiting ring groove; 212, through hole; 2121, blocking ring block; 213, first seal; 22, locking steel ball; 3, ventilation passage; 31, first air inlet; 32, second air inlet; 33, first passage; 34, second passage; 35, third passage; 36, fourth passage; 37, fifth passage; 38, sixth passage; 39, seventh passage; 40, eighth passage; 41, ventilation groove. Detailed implementation manners

[0035] The following further describes the present application in detail with reference to the Figure 1-8 accompanying drawings.

[0036] An embodiment of the present application discloses a cylinder with a front end lock. Referring to Figure 1 , a cylinder with a front end lock includes a cylinder barrel 1, a locking assembly 2 and a ventilation passage 3. A piston rod 11 is arranged in the cylinder barrel 1. The locking assembly 2 is sleeved on the piston rod 11 to lock or unlock the piston rod 11. The ventilation passage 3 is arranged in the cylinder barrel 1 to generate a pressure difference through the ventilation passage 3.

[0037] Referring to Figure 1, the cylinder barrel 1 is cylindrical. At both ends of the cylinder barrel 1, a front end cover 12 and a rear end cover 13 are respectively inserted. Let the end of the cylinder barrel 1 connected to the front end cover 12 be the front end of the cylinder barrel 1, then the end of the cylinder barrel 1 connected to the rear end cover 13 is the rear end of the cylinder barrel 1. A first convex block 121 is integrally formed on the outer side wall of the front end cover 12, so that after the front end cover 12 is inserted into the front end of the cylinder barrel 1, it can abut against the front end of the cylinder barrel 1. A support cover 14 is connected to the end of the front end cover 12 facing away from the cylinder barrel 1. The end of the front end cover 12 facing away from the cylinder barrel 1 is inserted into the support cover 14, so that the end of the support cover 14 close to the front end cover 12 abuts against the first convex block 121. A second convex block 131 is integrally formed on the end of the rear end cover 13 facing away from the cylinder barrel 1, so that after the rear end cover 13 is inserted into the rear end of the cylinder barrel 1, the end of the cylinder barrel 1 close to the rear end cover 13 can abut against the second convex block 131.

[0038] Refer to Figure 1 and Figure 2 , let the end of the piston rod 11 close to the front end cover 12 be the front end of the piston rod 11, then the end of the piston rod 11 close to the rear end cover 13 is the rear end of the piston rod 11. The front end of the piston rod 11 is sequentially passed through the front end cover 12 and the support cover 14. The locking assembly 2 is sleeved on the front end of the piston rod 11. A piston 111 is sleeved at the rear end of the piston rod 11. A second cavity 15 is left between the piston 111 and the rear end cover 13, and a third cavity 16 is left between the piston 111 and the front end cover 12.

[0039] Refer to Figure 2 and Figure 3 , the locking assembly 2 includes a locking pin 21 and a number of uniformly distributed locking steel balls 22. The rear end of the locking pin 21 is inserted into the front end cover 12. The front end cover 12 is threadedly connected to the locking pin 21, and a high-strength thread glue is provided at the threaded connection of the front end cover 12 and the locking pin 21. A limiting ring block 122 is integrally formed in the inner side wall of the front end cover 12. A limiting ring groove 211 is provided at the corresponding position of the locking pin 21, so that the locking pin 21 can be installed at an appropriate position. A number of equally spaced through holes 212 are provided in the peripheral wall of the locking pin 21. In this embodiment, according to the size of the locking pin 21, three equally spaced through holes 212 are preferably provided. The adjacent two through holes 212 are uniformly distributed at 120°. The locking steel balls 22 are placed in the through holes 212. Therefore, in this embodiment, three equally spaced locking steel balls 22 are selected and arranged in the locking pin 21. A first sealing member 213 is sleeved on the outer peripheral wall of the locking pin 21. The first sealing member 213 is located behind the locking steel balls 22.

[0040] Refer to Figure 2 , Figure 3 and Figure 4A shielding ring block 2121 is integrally formed at the peripheral wall of the through hole 212 near the locking pin 21. The diameter of the shielding ring block 2121 is smaller than the diameter of the locking steel ball 22, so that the locking steel ball 22 is not easy to escape from the through hole 212, and a locking piston 141 is sleeved on the outer peripheral wall of the locking pin 21. The locking piston 141 is located in the support cover 14, and the front end of the locking piston 141 abuts against the support cover 14. A first cavity 17 is left between the rear end of the locking piston 141 and the front end cover 12. The first sealing member 213 is located in the first cavity 17 and cooperates with the locking piston 141 to seal;

[0041] Reference Figure 1 , Figure 2 and Figure 3 A return spring 142 is sleeved at the front end of the locking piston 141, and the end of the return spring 142 that is away from the locking piston 141 abuts against the support cover 14, and a second sealing member 1411 is sleeved at the rear end of the locking piston 141, and the end of the second sealing member 1411 that is away from the locking piston 141 abuts against the inner side wall of the support cover 14, and a lending groove 1412 is provided at the end of the locking piston 141 abutting against the locking pin 21, so that the locking steel ball 22 can be engaged with the lending groove 1412, and an annular groove 112 that is engaged with the locking steel ball 22 is provided at the outer side wall of the piston rod 11 between the front end cover 12 and the rear end cover 13, and the annular groove 112 is flared to facilitate the engagement with the locking steel ball 22.

[0042] Reference Figures 1 to 8 The ventilation channel 3 includes a first air inlet 31, a second air inlet 32, a first channel 33, a second channel 34, a third channel 35, a fourth channel 36, a fifth channel 37, a sixth channel 38, a seventh channel 39, an eighth channel 40 and a ventilation groove 41. The first air inlet 31 and the second air inlet 32 ​​are respectively arranged at the second protrusion 131 of the rear end cover 13. In this embodiment, the first air inlet 31 and the second air inlet 32 ​​are arranged opposite to each other, and the eighth channel 40 is opened at the rear end cover 13. One end of the eighth channel 40 is connected to the second air inlet 32, and the other end of the eighth channel 40 is connected to the second volume chamber 15, so that when the second air inlet 32 ​​is connected to the air source, the connected compressed air passes through the second air inlet 32 ​​and the eighth channel 40 in sequence to reach the second volume chamber 15, so that the air pressure in the second volume chamber 15 changes, thereby pushing the piston 111 to move toward the front end cover 12.

[0043] Reference Figure 1 , Figure 2 and Figure 6, there is a gap between the inner wall of the front end cover 12 behind the first bump 121 and the outer wall of the piston rod 11. This gap is the seventh channel 39, and the seventh channel 39 is connected to the third cavity 16. An air vent groove 41 is also provided at the rear end of the front end cover 12. The air vent groove 41 is respectively connected to the seventh channel 39 and the third cavity 16. When the piston 111 moves to abut against the front end cover 12, the seventh channel 39 is no longer directly connected to the third cavity 16. At this time, the seventh channel 39 can be connected to the third cavity 16 through the air vent groove 41.

[0044] Refer to Figure 2 and Figure 7 , there is a gap between the inner wall of the locking pin 21 at the rear end and the outer wall of the piston rod 11. This gap is the sixth channel 38. One end of the sixth channel 38 is connected to the seventh channel 39. The locking pin 21 is provided with a fifth channel 37. The end of the sixth channel 38 facing away from the connection with the seventh channel 39 is connected to the fifth channel 37. There is a gap between the outer wall of the locking pin 21 and the inner wall of the locking piston 141. This gap is the fourth channel 36. One end of the fourth channel 36 is connected to the fifth channel 37. The end of the fourth channel 36 facing away from the connection with the fifth channel 37 is connected to the first cavity 17.

[0045] Refer to Figures 1 to 8 , a third channel 35 is provided at the front end of the front end cover 12. One end of the third channel 35 is connected to the first cavity 17. A second channel 34 is provided inside the side wall of the cylinder barrel 1. The second channel 34 extends along the length direction of the cylinder barrel 1. The end of the third channel 35 facing away from the connection with the first cavity 17 is connected to the second channel 34. A first channel 33 is provided at the rear end cover 13. The end of the second channel 34 facing away from the connection with the third channel 35 is connected to the first channel 33. The end of the first channel 33 facing away from the connection with the second channel 34 is connected to the first air inlet 31, so that the first air inlet 31, the first channel 33, the second channel 34, the third channel 35, the fourth channel 36, the fifth channel 37, the sixth channel 38, the seventh channel 39 and the air vent groove 41 are connected, which is conducive to the reciprocating circulation of compressed air.

[0046] The implementation principle of a cylinder with a front-end lock in an embodiment of the present application is as follows: Connect the second air inlet 32 to a gas source, and introduce compressed air into the second cavity 15 through the second air inlet 32 and the eighth channel 40. Under the action of the compressed air, the piston 111 is pushed in the direction of the front end cover 12, and at the same time, the piston rod 11 is also pushed out of the cylinder, that is, the piston rod 11 extends outwards. During the movement of the piston 111, the gas in the third cavity 16 is compressed, and the compressed gas enters the first cavity 17 through the seventh channel 39, the sixth channel 38, the fifth channel 37, and the fourth channel 36, and then is discharged from the first cavity 17 through the third channel 35, the second channel 34, and the first channel 33, and from the first air inlet 31. As the gas in the first cavity 17 is discharged, the locking piston 141 moves in the direction of the front end cover 12 under the action of the return spring 142. At this time, the lending groove 1412 also moves in the direction of the front end cover 12. Therefore, the locking steel ball 22 is pushed towards the piston rod 11 by the inner side wall of the locking piston 141. When the piston 111 moves to abut against the front end cover 12, the locking steel ball 22 engages with the annular groove 112, and the locking piston 141 also abuts against the front end cover 12.

[0047] Then connect the first air inlet 31 to a gas source, and the compressed air sequentially passes through the first air inlet 31, the first channel 33, the second channel 34, and the third channel 35 to reach the first cavity 17. Since the locking piston 141 abuts against the front end cover 12, the fourth channel 36 is sealed by the first seal 213. At this time, the compressed air cannot diffuse to the third cavity 16. Therefore, the compressed air in the first cavity 17 pushes the locking piston 141 in the direction of the return spring 142. As the locking piston 141 moves, the lending groove 1412 aligns with the locking steel ball 22, and the locking steel ball 22 unlocks the piston rod 11, and the fourth channel 36 is no longer sealed by the first seal 213. Therefore, the compressed air in the first cavity 17 is sequentially discharged into the third cavity 16 along the directions of the fourth channel 36, the fifth channel 37, the sixth channel 38, the seventh channel 39, and the ventilation groove 41. The piston 111 is pushed back by the compressed air discharged into the third cavity 16. During the backward movement of the piston 111, the gas in the second cavity 15 is compressed, and the compressed gas is discharged along the eighth channel 40 and the second air inlet 32. When the piston 111 moves to abut against the rear end cover 13, the cylinder is completely retracted at this time.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A cylinder with a front end lock, comprising a cylinder barrel (1) and a piston rod (11) arranged in the cylinder barrel (1), the cylinder barrel (1) having a front end cover (12) and a rear end cover (13) at both ends thereof, the front end cover (12) having a support cover (14) at one end thereof facing away from the cylinder barrel (1), characterized in that: A locking piston (141) is provided at one end of the piston rod (11) passing through the front end cover (12). The locking piston (141) is arranged in the support cover (14). A locking assembly (2) is provided between the locking piston (141) and the piston rod (11). A first cavity (17) is provided between the locking piston (141) and the front end cover (12). A return spring (142) is provided at one end of the locking piston (141) facing away from the first cavity (17). The front end cover (12), the cylinder barrel (1) and the rear end cover (13) are provided with a connected ventilation channel (3). The ventilation channel (3) is connected to the first cavity (17), so that the locking piston (141) unlocks or locks the locking assembly (2) by the air pressure passing through the ventilation channel (3).

2. A cylinder with a front end lock according to claim 1, characterized in that: The locking assembly (2) further comprises a locking pin (21) arranged at one end of the piston rod (11) passing through the front end cover (12); the locking pin (21) is provided with a plurality of equally spaced through holes (212); a locking steel ball (22) for locking the piston rod (11) is placed in the through hole (212); and the locking piston (141) is provided with a lending groove (1412) for the locking steel ball (22) to unlock the piston rod (11).

3. A cylinder with a front end lock according to claim 2, characterized in that: The piston rod (11) is provided with an annular groove (112) at the side walls of the front end cover (12) and the rear end cover (13) for engaging with the locking steel ball (22).

4. A cylinder with a front end lock according to claim 2, characterized in that: The ventilation channel (3) comprises a first air inlet (31) and a first channel (33) which are connected and arranged on the rear end cover (13), a second channel (34) which is extended along the length direction of the cylinder barrel (1), and a third channel (35) which is arranged on the front end cover (12), wherein the third channel (35) is connected to the first cavity (17).

5. A cylinder with a front end lock according to claim 4, characterized in that: The ventilation channel (3) further comprises a fourth channel (36) which is arranged between the locking piston (141) and the locking pin (21) and is connected to the first cavity (17), a fifth channel (37) which is arranged at the locking pin (21), a sixth channel (38) which is arranged between the locking pin (21) and the piston rod (11), a seventh channel (39) which is arranged between the front end cover (12) and the piston rod (11), and a ventilation groove (41) which is arranged at one end of the front end cover (12) away from the first cavity (17), and the ventilation groove (41) is connected to the inside of the cylinder barrel (1).

6. A cylinder with a front end lock according to claim 5, characterized in that: A first sealing member (213) is provided at the side wall where the locking pin (21) abuts against the locking piston (141), and the first sealing member (213) is provided behind the fifth channel (37) and in the first cavity (17).

7. A cylinder with a front end lock according to claim 6, characterized in that: A second sealing member (1411) is provided between the locking piston (141) and the support cover (14).

8. The cylinder with a front end lock according to claim 4, characterized in that: The ventilation channel (3) further comprises a second air inlet (32) and an eighth channel (40) which are connected and arranged on the rear end cover (13).

9. A cylinder with a front end lock according to claim 8, characterized in that: A piston (111) is provided at one end of the piston rod (11) close to the rear end cover (13), a second cavity (15) is provided between the piston (111) and the rear end cover (13), and the second cavity (15) is communicated with the eighth channel (40).

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