Air cylinder with self-locking function

Abstract

An air cylinder with a self-locking function comprises a cylinder body, a movable first piston provided with a first piston rod and a second piston provided with a second piston rod are arranged in a cavity of the cylinder body, and the cavity of the cylinder body serves as a first air cavity in the space located on the right side of the second piston and is communicated with a first air hole formed in the cylinder body. The cavity of the cylinder body serves as a second air cavity in the space located on the left side of the first piston and communicates with a second air hole formed in the cylinder body, and part of the second piston rod moves in the first piston so as to serve as a power component to drive the first piston to move when the first piston rod stretches out or retracts back. The first piston is provided with a plurality of vent holes for guiding gas to penetrate through the first piston to act on the second piston, the first piston is provided with a locking unit capable of retracting after being extruded, and the inner wall of the cavity of the cylinder body is provided with a locking node which is combined with the locking unit and prevents the first piston from moving. The locking unit can automatically enter or leave the locking node.

Description

Technical Field

[0001] The invention relates to the technical field of cylinders, in particular to a cylinder with a self-locking function. Background Art

[0002] The cylinder is generally composed of a cylinder body, an end cover, a piston, a piston rod and a seal. The cylinder is a cylindrical metal part that guides the piston to perform linear reciprocating motion in it, converting the pressure energy of compressed air into mechanical energy, driving the mechanism to perform linear reciprocating motion, swinging and rotating motion. At present, cylinders have been widely used in printing, semiconductors, automation control, robots and other fields.

[0003] Publication (announcement) number: CN107191428B discloses an inner and outer piston self-locking cylinder, comprising a cylinder body, with a front cover and a rear cover fixedly connected at both ends of the cylinder body respectively, the cylinder body comprising an inner cylinder sleeve and an outer cylinder sleeve, the inner cylinder sleeve is provided with a movable inner piston and a piston rod, the piston rod extends into the inner cylinder sleeve from the front cover, and one end of the piston rod extending into the inner cylinder sleeve is fixedly connected to the inner piston, the front cover is provided with an air outlet connecting the inner cylinder sleeve with the outside, the outer cylinder sleeve is provided with an outer piston and hydraulic oil, the front cover is provided with an air inlet connecting with the outer piston, the rear cover is provided with a connecting hole connecting the hydraulic oil with the inner cylinder sleeve, the front cover is provided with a accommodating chamber connecting with the air outlet, a brake lock assembly in the accommodating chamber, the brake lock assembly comprises a brake rod, the piston rod is provided with an embedding groove matching with the brake rod, the end of the brake rod is connected with a brake piston, and a spring is provided between the brake piston and the accommodating chamber to make the brake rod tightly against the embedding groove. This cylinder is provided with a brake lock assembly for preventing the piston rod from suddenly retracting due to air leakage after the piston rod is extended. The brake lock assembly cooperates with the embedded groove on the piston rod, that is, when the piston rod is extended to the limit position, the brake rod originally against the outer peripheral surface of the piston rod automatically enters the embedded groove under the drive of the spring to complete the locking, and when unlocking, the brake rod is moved out of the embedded groove by pneumatic means to unlock at night. Although this method can achieve automatic locking and unlocking, it has a defect, that is, it needs to rely on gas drive when unlocking, because the brake piston connected to the brake rod is arranged in a accommodating chamber connected to the air outlet. Although the gas can push the brake piston to move after entering the accommodating chamber, the gas is also used to push the inner piston to move, which results in a large gas pressure required for the cylinder, that is, a large air intake requirement, so This results in high energy consumption; the cylinder also uses two power media, namely hydraulic oil and gas. The gas is used to drive the outer piston to move, and then the hydraulic oil is pushed into the inner cylinder sleeve through the outer piston and used to drive the inner piston to move. This method has defects. Even if a seal is set on the outer piston, the seal is a consumable part. After a certain period of use, the seal will harden. After hardening, the fitting gap cannot be completely sealed, which will cause gas leakage and gas and hydraulic oil cross-contamination. The cross-contamination will cause the cylinder to be unstable during pressurization, shake during use, slow piston rod movement, abnormal noise inside, etc., affecting the normal use of the cylinder. Moreover, when too much gas enters, the volume of the hydraulic oil will increase, resulting in the risk of explosion of the cylinder. Therefore, it is necessary to vent the air regularly, which increases the workload. Summary of the invention

[0004] The present invention aims to solve the above-mentioned shortcomings of the prior art and provide a cylinder with a self-locking function to solve the above-mentioned problems.

[0005] The present invention adopts a technical solution to solve its technical problems: the cylinder with a self-locking function comprises a cylinder body, a first piston which is movable and provided with a first piston rod, and a second piston which is provided with a second piston rod are arranged in a chamber of the cylinder body, a space in the chamber of the cylinder body located on the right side of the second piston is used as a first air chamber and is communicated with a first air hole arranged on the cylinder body, a space in the chamber of the cylinder body located on the left side of the first piston is used as a second air chamber and is communicated with a second air hole arranged on the cylinder body, a part of the second piston rod moves in the first piston to act as a power component to drive the first piston to move when the first piston rod is extended or retracted, a plurality of air vents are arranged on the first piston to guide gas to pass through the first piston to act on the second piston, a locking unit which can be retracted under compression is arranged on the first piston, a locking node which is combined with the locking unit and prevents the first piston from moving is arranged on the inner wall of the chamber of the cylinder body, and the locking unit can automatically enter or leave the locking node.

[0006] For further improvement, the first piston is provided with a first guide channel which runs transversely therethrough, a second guide channel which is perpendicular to the guiding direction of the first guide channel and is symmetrically distributed on both sides thereof, and a third guide channel which is interconnected with the first guide channel and the second guide channel and whose guiding direction is consistent with that of the first guide channel. The first guide channel is for part of the second piston rod to move therein, and each second guide channel is for a locking unit to move therein. A stop block which is symmetrically distributed on both sides and moves within the third guide channel is provided on part of the piston rod placed in the first guide channel. The stop block abuts against the side surface of the locking unit when the locking unit has not entered into the locking node, and abuts against the bottom surface of the locking unit when the locking unit enters into the locking node.

[0007] Further improvement, the first piston includes two mutually assembled blocks, and the assembled surfaces of the assembled blocks are provided with a first guide channel, a second guide channel, and a third guide channel.

[0008] Further improvement, the ventilation holes are arranged throughout the assembly block and are distributed in an array along the width direction thereof.

[0009] For further improvement, when the stop block abuts against the side of the locking unit, a d1 reserved spacing is formed between the stop block and the stop side of the third guide channel, and a d2 reserved spacing consistent with the distance of the d1 reserved spacing is provided between the first piston and the second piston, so that after the locking unit enters the locking node, the second piston rod continues to move the distance of the d1 reserved spacing so that the stop block abuts against the bottom surface of the locking unit, and the second piston continues to move the distance of the d2 reserved spacing so that the second piston abuts against the first piston.

[0010] Further improvement, the locking node includes a semi-enclosing wall formed on the inner wall of the cylinder chamber, and a rebound space defined within the semi-enclosing wall and allowing the locking unit to rebound therein; the semi-enclosing wall abuts against the locking unit in the direction opposite to the locking direction.

[0011] Further improvement, the locking unit includes a locking block, and extension blocks extending in different directions from both sides of the locking block, the locking block is combined with the locking node and used in conjunction with the stop block, the second guide channel is provided with a fourth guide channel on the splicing block that is consistent with its guide direction and extends to the third guide channel, the extension block extends into the fourth guide channel, and is provided with a spring placed in the fourth guide channel and having an elastic compression amount in the retraction direction of the locking unit, the spring provides support for the extension body so that the locking unit can automatically rebound into the locking node.

[0012] Further improvement, the semi-enclosing wall is in the shape of an isosceles trapezoid, and the configurations of the front end and the rear end of the locking block are consistent with the configuration of the semi-enclosing wall.

[0013] Further improvement, the end of the stop block in contact with the locking block has a chamfer transition that is consistent with the isosceles angle of the isosceles trapezoidal configuration.

[0014] For further improvement, the first piston and the second piston are both provided with sealing rings and wear-resistant rings; sealing rings are both provided between the first piston rod and the cylinder body, and between the second piston rod and the cylinder body.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention utilizes the vent hole provided on the first piston to guide the gas to act directly on the second piston, and utilizes the cooperation between the second piston rod and the first piston to realize the passive movement of the first piston, thereby realizing the pure use of gas as the driving medium, that is, in this way, the situation of cross-flow of hydraulic oil and gas will not occur, and the regular exhaust maintenance operation is reduced while ensuring the stable operation of the cylinder;

[0017] 2. The locking unit of the present invention utilizes its own configuration, spring, and the configuration of the locking node to enable the locking unit to have the ability to automatically enter or leave the locking node, so that there is no need for gas intervention, so that the gas pressure required by the cylinder is smaller, that is, the air intake requirement is small, thereby resulting in low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the full cross-section structure of the present invention, and the cylinder is in an unactivated state;

[0019] Figure 2 It is a schematic diagram of the full cross-section structure of the present invention, and the cylinder is in the starting state;

[0020] Figure 3It is a structural schematic diagram of the splicing block of the present invention;

[0021] Figure 4 For the present invention Figure 3 A partial enlarged schematic diagram of part A;

[0022] Figure 5 It is a structural schematic diagram of the side surface of the splicing block of the present invention;

[0023] Figure 6 It is a partial enlarged schematic diagram of the cylinder body of the present invention, used to show the locking node. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Referring to the accompanying drawings: This cylinder with a self-locking function includes a cylinder body 1, a first piston 2 which is movable and is provided with a first piston rod 21, and a second piston 3 which is provided with a second piston rod 31 are arranged in the chamber of the cylinder body 1, the chamber of the cylinder body 1 is used as a first air chamber 11 in the space located on the right side of the second piston 3, and is communicated with a first air hole 11-a arranged on the cylinder body 11, the chamber of the cylinder body 1 is used as a second air chamber 12 in the space located on the left side of the first piston 2, and is communicated with a second air hole 12-a arranged on the cylinder body 1, part of the second piston rod 31 moves in the first piston 2 to drive the first piston 2 to move as a power component when the first piston rod 2 is extended or retracted, a plurality of ventilation holes 8 are arranged on the first piston 2 to guide gas to pass through the first piston 2 to act on the second piston 3, a locking unit 4 which can be squeezed and retracted is arranged on the first piston 2, and a locking node 5 which is combined with the locking unit 4 and prevents the first piston 2 from moving is arranged on the inner wall of the chamber of the cylinder body 1, and the locking unit 4 can automatically enter or leave the locking node 5. The principle of the present invention is that pure gas is used as the driving medium, so that there will be no cross-talk between hydraulic oil and gas, while ensuring the stable operation of the cylinder, it also reduces the regular exhaust maintenance operation. The first piston 2 is a passive moving component, and the second piston 3 is an active moving component. When the first piston rod 21 extends and moves, the gas enters from the first air hole 11-a and acts on the right side of the second piston 3, so that the second piston rod 31 that moves with the second piston 3 can push the first piston 2 to move. Similarly, when the first piston rod 21 retracts and moves, the gas enters from the second air hole 12-a and passes through the air vent 8 to act on the left side of the second piston 3, so that the second piston rod 31 that moves with the second piston 3 can pull the first piston 2. The piston 2 moves, and the locking unit 4 and the locking node 5 lock the position of the first piston 2 after the first piston rod 21 moves to the extended limit position, so that the first air hole 11-a no longer continues to take in air. In this way, the first piston rod 21 can always maintain the extended state in the absence of a gas medium. At the same time, the gravity of the external connection parts is applied to the first piston rod 21, that is, the first piston 2. In this way, when the cylinder is subjected to external connection parts with a gravity greater than its own gravity, it can also ensure a stable supporting effect, thereby improving safety. The locking unit 4 has the ability to automatically enter or leave the locking node 5, and does not need to be achieved through gas as a medium. In this way, the gas pressure required by the cylinder is relatively small, that is, the air intake requirement is small, thereby resulting in low energy consumption.

[0026] The first piston 2 is provided with a first guide channel 22 which runs transversely therethrough, a second guide channel 23 which is perpendicular to the guiding direction of the first guide channel 22 and is symmetrically distributed on both sides thereof, and a third guide channel 24 which is interconnected with the first guide channel 22 and the second guide channel 23 and has a guiding direction consistent with that of the first guide channel 22. The first guide channel 22 allows part of the second piston rod 31 to move therein, and each second guide channel 23 allows a locking unit 4 to move therein. A stop block 6 which is symmetrically distributed on both sides and moves within the third guide channel 24 is provided on part of the second piston rod 31 which is disposed within the first guide channel 22. The stop block 6 abuts against the side surface of the locking unit 4 when the locking unit 4 has not entered into the locking node 5, and abuts against the bottom surface of the locking unit 4 when the locking unit 4 enters into the locking node 5. Such a configuration enables the second piston rod 31 to move within the first piston 2, that is, it is achieved through the first guide channel 22, the second guide channel 23 places the locking unit 4 therein and provides movement guidance for it, so that the locking unit 4 can smoothly enter or leave the locking node 5 under the guidance of the second guide channel 23, and the third guide channel 24 is used to meet the configuration of the second piston rod 31 after the stop block 6 is set, that is, it is a step configuration, so that when the second piston rod 31 is retracted, the stop block 6 can abut against the step surface of the third guide channel 24, thereby driving the first piston 2 to move back, and also allowing the locking unit 4 to cooperate with the stop block 6. The stop block 6 is a multifunctional component, that is, when the locking unit 4 does not reach the locking node 5, it is used as a force transmission part to cooperate with the locking unit 4, and when the locking unit 4 reaches and combines with the locking node 5, it is used as a blocking component to cooperate with the locking unit 4 to prevent the locking unit 4 from escaping from the locking node 5.

[0027] The first piston 2 includes two mutually assembled blocks 25, and the first guide channel 22, the second guide channel 23, and the third guide channel 24 are arranged on the assembly surface 25-a of the assembly block 25. Such an arrangement is made in consideration that the outer shape of the second piston rod 31 is no longer a simple cylindrical configuration after the stop block 6 is set, so it cannot be directly inserted into the first piston 2. Therefore, the first piston 2 is constructed by assembly, so that the second piston rod 31 after the stop block 6 is set exists in the first guide channel 22. The two assembly blocks 24 can be fixed by bolts after assembly, and a sealing strip can be arranged at the edge position of the assembly surface 25-a to seal the assembly gap generated by the assembly, so as to prevent gas from entering the first guide channel 22, the second guide channel 23, and the third guide channel 24. At the same time, the depth of the first guide channel 22, the second guide channel 23, and the third guide channel 24 on each assembly block 25 is half of the depth of the components placed therein, so that after the two assembly blocks 25 are assembled, there will be no uneven matching with the components existing therein.

[0028] The vent holes 8 are arranged throughout the assembly block 25 and are distributed in an array along its width direction. Such an arrangement allows the assembly block 25 to have multiple vent holes 8, namely, there are two vent holes, so that the gas can quickly reach the second piston 3, thereby improving the timeliness of the second piston 3 when the first piston rod 21 retracts.

[0029] When the stop block 6 abuts against the side of the locking unit 4, a reserved spacing of d1 is formed between the stop block 6 and the stop side surface 24-a of the third guide channel 24, and a reserved spacing of d2 that is consistent with the distance of the reserved spacing of d1 is provided between the first piston 2 and the second piston 3, so that after the locking unit 4 enters the locking node 5, the second piston rod 31 continues to move the distance of the reserved spacing of d1 so that the stop block 6 abuts against the bottom surface of the locking unit 4, and the second piston 3 continues to move the distance of the reserved spacing of d2 so that the second piston 3 abuts against the first piston 2. Such a setting is made in consideration of the fact that when the locking unit 4 is in the unlocked state, the inner wall of the chamber of the cylinder body 1 is used as a constraint surface to completely confine it within the second guide channel 23. In this case, the stop block 6 abuts against the side of the locking unit 4, thereby transmitting the thrust of the second piston rod 31 to the first piston 2 to make it move in the extending direction, and wait until the first piston 2 moves to When the locking unit 4 is at the position corresponding to the locking node 5, the locking unit 4 enters the locking node 5. At this time, the locking unit 4 no longer abuts against the inner wall of the chamber of the cylinder body 1, and the locking unit 4 no longer abuts against the stop block 6, that is, the movement restriction of the second piston rod 31 is also released, and the second piston rod 31 continues to move under the thrust of the gas medium, that is, it moves a distance of d1 reserved spacing, so that the second piston rod 31 abuts against the stop side 24-a of the third guide channel 24 and shifts to the bottom of the locking unit 4, that is, it is used as a constraint component for the locking unit 4 to disengage from the locking node 5. At the same time, the second piston 3 also instantly moves a distance of d2 reserved spacing, so that the side of the second piston 3 can abut against the side of the first piston 2. This arrangement allows the gas to directly act on the side of the second piston 3 through the vent 8, thereby improving the timeliness of the second piston 3 when the first piston rod 21 retracts.

[0030] The locking node 5 includes a semi-enclosing wall 51 formed on the inner wall of the chamber of the cylinder body 1, and a rebound space 52 defined within the semi-enclosing wall 51 and allowing the locking unit 4 to rebound therein; the semi-enclosing wall 51 abuts against the locking unit 4 in the direction opposite to the locking direction, and when the locking unit 4 reaches the rebound space 52 of the locking node 5, the locking unit 4 is freely released from the restrained state squeezed by the inner wall of the chamber of the cylinder body 1, that is, it enters the locking node 5 under its rebound performance, and the enclosing wall 51 blocks the entering locking unit 4 and abuts against the locking unit 4 in the direction opposite to the locking direction, thereby preventing the locking unit 4 from returning along the original path, thereby completing the locking state of the cylinder.

[0031] The locking unit 4 includes a locking block 41 and extension blocks 42 extending in different directions from both sides of the locking block 41. The locking block 41 is combined with the locking node 5 and used in conjunction with the stop block 6. The second guide channel 23 is provided with a fourth guide channel 23-a on the splicing block 25 that is consistent with its guide direction and extends to the third guide channel 24. The extension block 42 extends into the fourth guide channel 23-a and is provided with a spring 7 placed in the fourth guide channel 23-a and having an elastic compression amount in the retraction direction of the locking unit 4. The spring 7 provides support for the extension body 42 so that the locking unit 4 can automatically rebound into the locking node 5, that is, the locking unit 4 has the ability to automatically enter the locking node 5. When the locking block 41 When it abuts against the inner wall of the chamber of the cylinder body 1, the spring 7 is in a compressed and force-accumulating state, so that when the locking block 41 is located at the locking node 5, the locking block 41 no longer abuts against the inner wall of the chamber of the cylinder body 1, and the spring 7 is freely released without constraint (i.e., it returns to its original length), so that the locking block 41 enters the locking node 5, and the fourth guide channel 23-a places the spring 7 inside, so that the spring 7 can be stably present inside by virtue of its setting that matches the size of the spring 7, and will not swing when deformation occurs. The extension block 42, as an extension of the locking block 41, abuts against the spring 7 to receive the thrust transmitted by the release of the spring 7, and uses the fourth guide channel 23-a as a moving guide to achieve movement.

[0032] The semi-enclosing wall 51 is in the shape of an isosceles trapezoid, and the front and rear ends of the locking block 41 are in the same shape as the semi-enclosing wall 51. This arrangement makes the locking node 5 as a whole in the shape of an isosceles trapezoid that is narrow inside and wide outside. The locking block 41 is consistent with the semi-enclosing wall 51 in configuration, so that the width of the part of the locking block 41 that first enters the rebound space 52 is smaller than the width of the entrance of the rebound space 52, so that the locking block 41 can quickly enter the locking node 5 without any interference in the fit. At the same time, such a configuration can squeeze the locking block 41 when the first piston 2 moves back, that is, the locking node 5 is gradually withdrawn from the locking node 5 during the movement of the first piston 2 by squeezing, so that no interference will occur when unlocking, thereby achieving automatic withdrawal from the locking node 5.

[0033] The end of the stop block 6 that contacts the locking block 41 has a chamfered transition 61 that is consistent with the isosceles angle of the isosceles trapezoidal configuration. This arrangement allows the inclined surface formed by the chamfered transition of the stop block 6 to fit with the inclined surface formed by the trapezoidal configuration of the locking block 41 when the stop block 6 contacts the side of the locking block 41. This can increase the contact area and improve the force transmission effect.

[0034] The first piston 2 and the second piston 3 are both provided with sealing rings and wear-resistant rings; sealing rings are provided between the first piston rod 21 and the cylinder body 1, between the second piston rod 31 and the cylinder body 1, and between the second piston rod 31 and the first piston 2. Such a setting can increase the sealing performance and avoid gas leakage.

[0035] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A cylinder with a self-locking function, comprising a cylinder body (1), characterized in that: The chamber of the cylinder body (1) is provided with a movable first piston (2) provided with a first piston rod (21), and a second piston (3) provided with a second piston rod (31); the chamber of the cylinder body (1) is used as a first air chamber (11) in a space located on the right side of the second piston (3) and is communicated with a first air hole (11-a) provided on the cylinder body (11); the chamber of the cylinder body (1) is used as a second air chamber (12) in a space located on the left side of the first piston (2) and is communicated with a second air hole (12-a) provided on the cylinder body (1); part of the second piston rod (31) is used as a second air chamber (12) in a space located on the left side of the first piston (2) and is communicated with a second air hole (12-a) provided on the cylinder body (1); ) moves in the first piston (2) so as to act as a power component to drive the first piston (2) to move when the first piston rod (2) is extended or retracted. The first piston (2) is provided with a plurality of vent holes (8) for guiding gas to pass through the first piston (2) to act on the second piston (3). The first piston (2) is provided with a locking unit (4) that can be retracted when squeezed. The cylinder body (1) is provided with a locking node (5) on the inner wall of the chamber, which is combined with the locking unit (4) and prevents the first piston (2) from moving. The locking unit (4) can automatically enter or leave the locking node (5).

2. The cylinder with self-locking function according to claim 1, characterized in that: The first piston (2) is provided with a first guide channel (22) which runs transversely through the first guide channel (22), a second guide channel (23) which is perpendicular to the guide direction of the first guide channel (22) and is symmetrically distributed on both sides thereof, and a third guide channel (24) which is interconnected with the first guide channel (22) and the second guide channel (23) and has a guide direction consistent with the guide direction of the first guide channel (22). The first guide channel (22) allows part of the second piston rod (31) to move therein, and each of the second guide channels (23) allows the locking unit (4) to move therein. A stop block (6) which is symmetrically distributed on both sides and moves in the third guide channel (24) is provided on the part of the second piston rod (31) disposed in the first guide channel (22). The stop block (6) abuts against the side surface of the locking unit (4) when the locking unit (4) has not entered the locking node (5), and abuts against the bottom surface of the locking unit (4) when the locking unit (4) enters the locking node (5).

3. The cylinder with self-locking function according to claim 2, characterized in that: The first piston (2) comprises two mutually assembled blocks (25), and the first guide channel (22), the second guide channel (23), and the third guide channel (24) are arranged on the assembled surfaces (25-a) of the assembled blocks (25).

4. The cylinder with self-locking function according to claim 3, characterized in that: The ventilation holes (8) are arranged throughout the assembly block (25) and are distributed in an array along the width direction thereof.

5. The cylinder with self-locking function according to claim 4, characterized in that: When the stop block (6) abuts against the side surface of the locking unit (4), a reserved spacing of d1 is formed between the stop block (6) and the stop side surface (24-a) of the third guide channel (24), and a reserved spacing of d2 that is consistent with the distance of the reserved spacing of d1 is formed between the first piston (2) and the second piston (3), so that after the locking unit (4) enters the locking node (5), the second piston rod (31) continues to move the distance of the reserved spacing of d1 so that the stop block (6) abuts against the bottom surface of the locking unit (4), and the second piston (3) continues to move the distance of the reserved spacing of d2 so that the second piston (3) abuts against the first piston (2).

6. The cylinder with self-locking function according to claim 2, characterized in that: The locking node (5) comprises a semi-enclosing wall (51) formed on the inner wall of the chamber of the cylinder (1), and a rebound space (52) defined within the semi-enclosing wall (51) and allowing the locking unit (4) to rebound therein; the semi-enclosing wall (51) abuts against the locking unit (4) in a direction opposite to the locking direction.

7. The cylinder with self-locking function according to claim 6, characterized in that: The locking unit (4) comprises a locking block (41) and extension blocks (42) extending in different directions from both sides of the locking block (41); the locking block (41) is combined with the locking node (5) and used in conjunction with the stop block (6); the second guide channel (23) is provided with a fourth guide channel (23-a) on the splicing block (25) which is consistent with its guide direction and extends to the third guide channel (24); the extension block (42) extends into the fourth guide channel (23-a) and is provided with a spring (7) which is placed in the fourth guide channel (23-a) and has an elastic compression amount in the retraction direction of the locking unit (4); the spring (7) provides support for the extension body (42) so that the locking unit (4) can automatically rebound into the locking node (5).

8. The cylinder with self-locking function according to claim 7, characterized in that: The semi-enclosed wall (51) is in the shape of an isosceles trapezoid, and the configurations of the front end and the rear end of the locking block (41) are consistent with the configuration of the semi-enclosed wall (51).

9. The cylinder with self-locking function according to claim 8, characterized in that: The end of the stop block (6) in contact with the locking block (41) has a chamfer transition (61) that is consistent with the isosceles angle of the isosceles trapezoidal configuration.

10. The cylinder with self-locking function according to claim 1, characterized in that: The first piston (2) and the second piston (3) are both provided with sealing rings and wear-resistant rings; sealing rings are both provided between the first piston rod (21) and the cylinder body (1), and between the second piston rod (31) and the cylinder body (1).

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