Blocking air cylinder capable of adjusting resistance
Through the design of the flow adjustment cavity and regulating valve needle in the blocking cylinder, the problem that the airflow cannot be adjusted in the existing technology has been solved, the stable buffer blocking function is achieved, the service life of the cylinder is extended and the cost is reduced.
Patent Information
- Application Number
- CN202420132907.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-19
AI Technical Summary
The airflow size in existing blocking cylinders cannot be adjusted, resulting in unstable blocking, damage to workpieces and cylinders, reducing service life and increasing costs.
Design a blocking cylinder including the first cylinder and the second cylinder seat. By setting the flow adjustment cavity and regulating valve needle, it can adjust the size of the air flow, thereby achieving a stable buffer blocking function.
The regulation of the size of the airflow is achieved, ensuring the stability and buffering effect of blocking, extending the service life of the cylinder and reducing the cost.
Smart Images
Figure CN222415468U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pneumatics, in particular to a blocking cylinder with adjustable resistance. Background Art
[0002] The blocking cylinder is mainly used in various automatic production lines. Its function is to buffer and block the workpiece moving at high speed. However, the airflow size in the existing blocking cylinder cannot be adjusted, so that the blocking cylinder has no adjustment force and the blocking is not stable. This is not good for the cylinder and the blocked workpiece, and it is easy to cause damage, which ultimately leads to a greatly reduced life of the blocking cylinder and an increasing cost of use. Utility Model Content
[0003] In view of the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a blocking cylinder with adjustable resistance, which has a reasonable and compact overall structure and can adjust the size of the airflow, thereby stably realizing the buffering and blocking function.
[0004] The utility model solves the technical problem by adopting a technical solution that is a blocking cylinder with adjustable resistance, comprising a first cylinder seat provided with a first air hole and a second air hole, and a second cylinder seat provided with a third air hole, the first cylinder seat is provided with a first pneumatic component that slides with a first cavity inside the first cylinder seat, a spring is provided at the bottom of the first pneumatic component, the second cylinder seat is transversely and vertically fixedly connected to the top of the upper end of the first pneumatic component, and moves vertically under the drive of the first pneumatic component, the second cylinder seat is also provided with a second pneumatic component that slides with a second cavity inside the first cylinder seat, the second pneumatic component The right end of the component is connected to a blocking block for blocking the workpiece. The first cylinder seat and the second cylinder seat are also provided with a connecting cavity connecting the first air hole and the third air hole. A guide rod with two ends passing through to form a guide channel is installed in the connecting cavity. The lower end of the guide rod is sealed and slidably matched in the lower part of the connecting cavity, and the upper end of the guide rod is sealed and fixedly matched in the upper part of the connecting cavity. The second cylinder seat is also provided with a flow regulating cavity. An adjusting valve needle is sealed and installed in the flow regulating cavity, and the adjusting valve needle can change the opening degree of the upper end through-port of the guide channel or the third air hole.
[0005] In the above scheme, the blocking block on the right end of the second pneumatic component will form a block for the workpiece on the production line. Under the action of the inertia of the workpiece, the blocking block causes the second pneumatic component to move toward the inside of the second cylinder seat. After blocking in place, the external switch uses the second air hole to make the upper air pressure of the first cavity overcome the elastic force of the spring and the lower air pressure. At this time, the first pneumatic component will synchronously drive the second cylinder seat to move downward, so that the blocking block makes way for the blocked workpiece, and the decelerated workpiece can pass slowly. The external switch then passes through the second air hole, and causes the first pneumatic component to drive the second cylinder seat to move upward under the joint action of the lower air pressure and the spring until it is reset, and a connecting chamber connecting the first air hole and the third air hole is provided between the first cylinder seat and the second cylinder seat, and a guide channel with a guide channel is provided in the connecting chamber. The guide rod, on the one hand, the air pipe only needs to be installed and cooperated with the first air hole and the second air hole, so that the overall structure of the blocking cylinder is simpler. At the same time, during the up and down movement of the second cylinder seat, the guide rod and the lower part of the connecting cavity will also form a guide, so that the movement of the second cylinder seat is smoother. In addition, an adjusting valve needle is arranged in the flow regulating cavity on the second cylinder seat. When the buffering force needs to be adjusted, the valve needle is adjusted to change the opening degree of the upper end through-port of the guide channel or the third air hole, so that the size of the airflow flowing into the second cavity is changed. When the blocking block on the second pneumatic component moves inward under the action of the inertia of the workpiece, the gas in the second cavity forms a corresponding buffering force. Therefore, the overall structure is reasonable and compact, and the airflow size can be adjusted, which can stably realize the buffering and blocking functions.
[0006] Furthermore, the flow regulating chamber is located directly above the connecting chamber, and the lower end of the flow regulating chamber cooperates with the middle end thread of the regulating valve needle. The lower end of the regulating valve needle is a conical head, and the conical head cooperates with the upper end through-port of the guide channel. A first annular groove is also provided above the threaded structure of the regulating valve needle, and a first sealing member is installed in the first annular groove.
[0007] In the above scheme, by setting the flow regulating chamber just above the connecting chamber, and setting the regulating valve needle and the flow regulating chamber in a threaded fit, and the lower end of the regulating valve needle is set as a conical head, as the regulating valve needle is screwed in or out, the opening degree of the upper end through-port of the guide channel can be gradually changed. The structural design is reasonable, and the adjustment is convenient and reasonable. The setting of the first annular groove can prevent the gas in the guide channel from leaking through the flow regulating chamber after the first sealing member is installed, thereby achieving reasonable sealing.
[0008] Furthermore, the top of the upper end of the guide rod is matched with the upper top of the connecting cavity in a gap, and the upper end of the guide channel is set to a corresponding narrow part to match the conical head, and radial air holes are also provided on the narrow part. The outer wall surface of the upper end of the guide rod is provided with a second annular groove relative to the top of the narrow part, and the second annular groove can be installed with a second seal.
[0009] In the above scheme, the upper end of the guide channel is set to a narrow part to match the conical head, and the structural design is reasonable. At the same time, radial air holes are set on the narrow part, and a gap is set between the upper top of the guide rod and the upper top of the connecting cavity. Under the action of the radial air holes and the upper end through-hole of the guide channel, the gas flow rate flowing into the second cylinder seat will be relatively large, so that the blocking cylinder can be used in an environment with large inertia, and the upper end outer wall surface of the guide rod is relative to the second annular groove above the narrow part. When the inertia of the blocked workpiece is too small, the second sealing member can be installed in the second annular groove to prevent the gas from flowing in from the radial air holes. Under the same working time, the gas flow rate in the second cylinder seat is small. Therefore, the blocking cylinder can also be used in an environment with too small inertia, with a wider range of applications. In addition, due to the threaded fixed fit between the guide rod and the second cylinder seat, assembly is also convenient.
[0010] Furthermore, a third annular groove is provided on the bottom of the lower end of the guide rod, and a third seal is installed in the third annular groove. A fourth annular groove is also provided at the upper bottom end of the connecting cavity below the threaded structure of the guide rod, and a fourth seal is installed in the fourth annular groove.
[0011] In the above scheme, the guide rod can achieve sealing of the lower and upper parts of the connecting chamber by means of a third seal installed in the third annular groove and a fourth seal installed in the fourth annular groove, so that the gas will not leak from the gap between the connecting chamber and the guide rod. The sealing effect is also good, and the stable buffering of the blocking cylinder is also ensured.
[0012] Furthermore, the first pneumatic component includes a first pneumatic piston that slides with the first cavity, and a first pneumatic piston rod that slides with the through hole in the center of the upper end of the first cylinder seat, the upper end of the spring is supported in the bottom cavity of the first pneumatic piston, the lower end of the first pneumatic piston rod is engaged in the top cavity of the first pneumatic piston, and the first pneumatic piston is provided with a through hole connecting the bottom cavity and the top cavity, and a blind hole is also provided in the bottom center of the lower end of the first pneumatic piston rod.
[0013] In the above scheme, the first pneumatic component is composed of a first pneumatic piston and a first pneumatic piston rod. Therefore, the first pneumatic piston and the first pneumatic piston rod can use metals of different materials according to the use requirements of different parts, and the lower end of the first pneumatic piston rod and the spring are respectively matched in the corresponding concave cavity of the first pneumatic piston, so that the up and down movement of the first pneumatic piston and the first pneumatic piston rod is more stable. Through the setting of through holes and blind holes, the weight of the first pneumatic piston and the first pneumatic piston rod is greatly reduced, the service life of the spring is guaranteed, and the use effect of the blocking cylinder is good.
[0014] Furthermore, the second pneumatic component includes a second pneumatic piston that is sealingly and slidingly matched with the second cavity, and a second pneumatic piston rod that is penetrated by the second pneumatic piston. The left end of the mounting hole that matches the second pneumatic piston and the second pneumatic piston rod is provided with a chamfer, and a countersunk hole is provided at the center of the left end of the second pneumatic piston rod. The countersunk hole causes the end of the second pneumatic piston rod to expand radially under the action of an external tool, and the second pneumatic piston rod extends to the chamfer after radial expansion.
[0015] In the above scheme, the second pneumatic piston and the second cavity are sealed and slidably matched. Therefore, during the operation of the second pneumatic component, the gas at the left end of the second cavity will not experience gas blowby, which makes the stable buffering effect better. The second pneumatic component adopts a split structure, and can also achieve the purpose of applying metals of different materials according to the use requirements of different parts. After the second pneumatic piston and the second pneumatic piston rod are assembled, an external tool is inserted into the countersunk hole to cause this end of the second pneumatic piston rod to expand radially, that is, to stretch this end of the second pneumatic piston rod to achieve the limitation of the second pneumatic piston. Compared with the interference fit method, during the resetting process, the second pneumatic piston is not easy to fall off when colliding with the cavity wall of the second cavity. The second pneumatic piston and the second pneumatic piston rod have high assembly stability, the blocking cylinder has a longer service life, and the structural design is more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a cross-sectional view of the overall structure of the utility model;
[0017] Figure 2 This is a structural cross-sectional view of the regulating valve needle and the guide rod of the utility model;
[0018] Figure 3 It is a structural cross-sectional view of the first cylinder seat and the second cylinder seat of the utility model;
[0019] Figure 4 This is a structural cross-sectional view of the first cylinder seat of the utility model (at the second air hole).
[0020] In the figure: 1-first cylinder seat, 2-second cylinder seat, 3-first air hole, 4-second air hole, 5-third air hole, 6-spring, 7-blocking block, 8-connecting chamber, 9-guide rod, 10-guide channel, 11-flow regulating chamber, 12-regulating valve needle, 13-conical head, 14-first annular groove, 15-narrow part, 16-radial air hole, 17-second annular groove, 18-third annular groove, 19-fourth annular groove, 20-first pneumatic piston, 21-first pneumatic piston rod, 22-through hole, 23-blind hole, 24-second pneumatic piston, 25-second pneumatic piston rod, 26-chamfer, 27-countersunk hole. DETAILED DESCRIPTION
[0021] In order to more clearly illustrate the embodiments of the utility model and / or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work. In addition, the orientation only represents the relative position relationship between the components, not the absolute position relationship.
[0022] See also Figures 1 to 4 As shown, a blocking cylinder with adjustable resistance includes a first cylinder seat 1 provided with a first air hole 3 and a second air hole 4, and a second cylinder seat 2 provided with a third air hole 5. More specifically, the first air hole 3 and the second air hole 4 are each provided with two and are distributed left and right, the first air hole 3 is connected with the lower end of the first cavity, the second air hole 4 is connected with the upper end of the first cavity, the third air hole 5 is provided with one and is formed on the left end bottom of the second cavity, the first cylinder seat 1 is also provided with a first pneumatic component that slides with the first cavity inside it, and the bottom of the first pneumatic component is also provided with a spring 6, the second cylinder seat 2 is transversely and vertically fixedly connected to the upper end top of the first pneumatic component, and is driven by the first pneumatic component to move vertically in the mounting groove at the upper end of the first cylinder seat 1, the second cylinder seat 2 is also provided with a second pneumatic component that slides with the second cavity inside it, and the right end of the second pneumatic component is connected to a blocking block 7 for blocking the workpiece.
[0023] In the above structure, the blocking block 7 on the right end of the second pneumatic component will form a block for the workpiece on the production line. Under the action of the inertia of the workpiece, the blocking block 7 causes the second pneumatic component to move toward the inside of the second cylinder base 2. After blocking in place, the external switch uses the second air hole 4 to allow the upper air pressure of the first cavity to overcome the elastic force and the lower air pressure of the spring 6. At this time, the first pneumatic component will synchronously drive the second cylinder base 2 to move downward, so that the blocking block 7 makes way for the blocked workpiece, and the decelerated workpiece can pass slowly. The external switch then passes through the second air hole 4, and causes the first pneumatic component to drive the second cylinder base 2 to move upward under the joint action of the lower air pressure and the spring 6 until it is reset. By utilizing the gas in the second cavity to form a buffering deceleration for the second pneumatic component, the buffering effect is good and the cost is saved. At the same time, the second cylinder base 2 is installed horizontally and vertically relative to the first cylinder base 1, which also serves the purpose of saving installation space.
[0024] In the present embodiment, a connecting chamber 8 connecting the first air hole 3 and the third air hole 5 is further provided between the first cylinder seat 1 and the second cylinder seat 2. More specifically, the connecting chamber 8 connects the third air hole 5 and the first air hole 3 on the left side. A guide rod 9 with two ends passing through to form a guide channel 10 is installed in the connecting chamber 8, and the lower end of the guide rod 9 is sealed and slidably matched in the lower part of the connecting chamber 8, and the upper end of the guide rod 9 is sealed and fixedly matched in the upper part of the connecting chamber 8. The guide rod 9 with the guide channel 10 is provided in the connecting chamber 8. With this structural setting, the air pipe only needs to be installed and matched with the first air hole 3 and the second air hole 4, and there is no need to install the air pipe at the third air hole 5. Therefore, the overall structure of the blocking cylinder is simpler. At the same time, during the up and down movement of the second cylinder seat 2, the guide rod 9 and the lower part of the connecting chamber 8 will also form a guide, so that the movement of the second cylinder seat 2 is smoother.
[0025] In the present embodiment, a flow regulating chamber 11 is further provided on the second cylinder seat 2, and an adjusting valve needle 12 is sealed and installed in the flow regulating chamber 11, and the adjusting valve needle 12 can change the opening degree of the upper end through-hole of the guide channel 10 or the third air hole 5. By arranging the adjusting valve needle 12 in the flow regulating chamber 11 on the second cylinder seat 2, when the buffering force needs to be adjusted, the opening degree of the upper end through-hole of the guide channel 10 or the third air hole 5 is changed by adjusting the valve needle 12, so that the size of the airflow flowing into the second cavity is changed. When the blocking block 7 on the second pneumatic component moves inward under the action of the inertia of the workpiece, the gas in the second cavity forms a corresponding buffering force. Therefore, the overall structure is reasonable and compact, and the purpose of adjusting the airflow size is achieved, and the buffering and blocking functions can be stably realized.
[0026] In the present embodiment, the flow regulating chamber 11 is arranged directly above the connecting chamber 8. More specifically, the flow regulating chamber 11 is formed by penetrating downward from the position where the upper end of the second cylinder seat 2 is directly opposite to the connecting chamber 8, and the lower end of the flow regulating chamber 11 cooperates with the middle end thread of the regulating valve needle 12. That is to say, the diameter of the lower end of the flow regulating chamber 11 will be smaller to form an internal thread structure, and the middle end of the regulating valve needle 12 will be larger to form a corresponding external thread structure, and the lower end of the regulating valve needle 12 is set as a conical head 13, and the conical head 13 cooperates with the upper end through-port of the guide channel 10. The lower end of the regulating valve needle 12 is set as the conical head 13. In this way, as the regulating valve needle 12 is screwed in or out, the opening degree of the upper end through-port of the guide channel 10 can be gradually changed. The structural design is reasonable, and the adjustment is also convenient and reasonable.
[0027] In this embodiment, a first annular groove 14 is further provided above the threaded structure of the regulating valve needle 12, and a first sealing member is installed in the first annular groove 14. The setting of the first annular groove 14 can prevent the gas in the guide channel 10 from leaking through the flow regulating chamber 11 after the first sealing member is installed, thereby achieving reasonable sealing.
[0028] In this embodiment, the top of the upper end of the guide rod 9 is matched with the upper top of the connecting chamber 8 in a gap, and the upper end of the guide channel 10 is set to a corresponding narrow portion 15 to match the conical head 13. The upper end of the guide channel 10 is set to a narrow portion 15 to match the conical head 13. The structural design is reasonable, and the narrow portion 15 is also provided with a radial air hole 16. In this way, since the upper end of the guide rod 9 and the upper top of the connecting chamber 8 are set to have a gap, under the action of the radial air hole 16 and the upper end through-hole of the guide channel 10, the gas flow rate flowing into the second cylinder seat 2 will be relatively large, so that the gas blocking The cylinder can be used in an environment with large inertia. More specifically, a second annular groove 17 is provided on the outer wall surface of the upper end of the guide rod 9 relative to the narrow portion 15. The second annular groove 17 can be installed with a second sealing member. In more detail, when the inertia of the blocked workpiece is too small, the second sealing member can be installed in the second annular groove 17 to prevent the gas from flowing in from the radial air hole 16. Under the same working time, the gas flow in the second cylinder base 2 is small. Therefore, the blocking cylinder can also be used in an environment with too small inertia, and has a wider range of applications. In addition, since the guide rod 9 and the second cylinder base 2 are threadedly fixed together, assembly is also convenient.
[0029] In this embodiment, the guide rod 9 and the upper part of the connecting chamber 8 are fixed by means of threaded cooperation, and a third annular groove 18 is provided on the bottom of the lower end of the guide rod 9, and a third sealing member is installed in the third annular groove 18. A fourth annular groove 19 is also provided at the upper bottom end of the connecting chamber 8 below the threaded structure of the guide rod 9, and a fourth sealing member is installed in the fourth annular groove 19. The guide rod 9 can seal the lower and upper parts of the connecting chamber 8 by means of the third sealing member installed in the third annular groove 18 and the fourth sealing member installed in the fourth annular groove 19, so that the gas will not leak from the gap between the connecting chamber 8 and the guide rod 9, and the sealing effect is also good, thereby ensuring the stable buffering of the blocking cylinder.
[0030] In this embodiment, a limiting ring groove is further formed below the threaded structure of the guide rod 9 and above the fourth ring groove 19. The formation of the limiting ring groove enables the guide rod 9 to form an installation limit when it is threadedly connected and fixed to the upper part of the connecting cavity 8, and limits the direction of the radial air hole 16.
[0031] In this embodiment, the first pneumatic assembly includes a first pneumatic piston 20 that is slidably matched with the first cavity, and a first pneumatic piston rod 21 that is slidably matched with the through hole at the center of the upper end of the first cylinder seat 1. The upper end of the spring 6 is supported in the bottom concave cavity of the first pneumatic piston 20, and the lower end of the first pneumatic piston rod 21 is matched in the top concave cavity of the first pneumatic piston 20. A through hole 22 that connects the bottom concave cavity and the top concave cavity is provided on the first pneumatic piston 20. A blind hole 23 is also provided at the bottom center of the lower end of the first pneumatic piston rod 21. The first pneumatic assembly consists of the first pneumatic piston 20 and the first pneumatic piston rod 21. The first pneumatic piston 20 and the first pneumatic piston rod 21 are composed of a pneumatic piston rod 21, so the first pneumatic piston 20 and the first pneumatic piston rod 21 can use metals of different materials according to the use requirements of different parts, and the lower end of the first pneumatic piston rod 21 and the spring 6 are respectively matched in the corresponding concave cavity of the first pneumatic piston 20, so that the up and down movement of the first pneumatic piston 20 and the first pneumatic piston rod 21 is more stable, and then through the setting of the through hole 22 and the blind hole 23, the weight of the first pneumatic piston 20 and the first pneumatic piston rod 21 is greatly reduced, the service life of the spring 6 is guaranteed, and the use effect of the blocking cylinder is good.
[0032] In this embodiment, a fifth annular groove is provided in the through hole at the center of the upper end of the first cylinder seat 1. The fifth annular groove is used to install a fifth sealing member. The fifth sealing member forms a sealed sliding fit with the first pneumatic piston rod 21. This arrangement can prevent leakage of gas in the first container.
[0033] In this embodiment, the second pneumatic assembly includes a second pneumatic piston 24 that is slidably matched with the second cavity, and a second pneumatic piston rod 25 that is inserted into the second pneumatic piston 24. The second pneumatic assembly also adopts a split structure, so that the purpose of applying metals of different materials according to the use requirements of different parts can be achieved, and the left end of the mounting hole where the second pneumatic piston 24 and the second pneumatic piston rod 25 match is provided with a chamfer 26, and the center of the left end of the second pneumatic piston rod 25 is provided with a countersunk hole 27, and the countersunk hole 27 causes the second pneumatic piston rod 25 to be moved under the action of an external tool. The second pneumatic piston rod 25 expands radially, and after the radial expansion, it extends to the chamfer 26, and is inserted into the countersunk hole 27 through an external tool, so that this end of the second pneumatic piston rod 25 expands radially, that is, this end of the second pneumatic piston rod 25 is stretched to achieve the limitation of the second pneumatic piston 24. Compared with the interference fit method, during the resetting process, the second pneumatic piston 24 is not easy to fall off when colliding with the cavity wall of the second cavity. The second pneumatic piston 24 and the second pneumatic piston rod 25 have high assembly stability, the blocking cylinder has a longer service life, and the structural design is more reasonable.
[0034] In this example, a sixth annular groove is provided on the skirt of the second pneumatic piston 24, and the sixth annular groove is used to install the sixth seal. This structure realizes the sealed sliding cooperation between the second pneumatic piston 24 and the second cavity. Therefore, during the movement of the second pneumatic piston 24, the gas at the left end of the second cavity will not experience gas blowby, so that the stable buffering effect is better.
[0035] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A blocking cylinder with adjustable resistance, comprising a first cylinder seat (1) provided with a first air hole (3) and a second air hole (4), and a second cylinder seat (2) provided with a third air hole (5), the first cylinder seat (1) being provided with a first pneumatic assembly slidably matched with a first cavity inside the first cylinder seat, a spring (6) being provided at the bottom of the first pneumatic assembly, the second cylinder seat (2) being laterally and vertically fixedly connected to the top of the upper end of the first pneumatic assembly and being moved vertically under the drive of the first pneumatic assembly, the second cylinder seat (2) being further provided with a second pneumatic assembly slidably matched with a second cavity inside the second cylinder seat, a blocking block (7) for blocking a workpiece being connected to the right end of the second pneumatic assembly, characterized in that: The first cylinder seat (1) and the second cylinder seat (2) are also provided with a connecting cavity (8) communicating with the first air hole (3) and the third air hole (5). A guide rod (9) is installed in the connecting cavity (8) with two ends passing through to form a guide channel (10). The lower end of the guide rod (9) is sealed and slidably matched in the lower part of the connecting cavity (8), and the upper end of the guide rod (9) is sealed and fixedly matched in the upper part of the connecting cavity (8). The second cylinder seat (2) is also provided with a flow regulating cavity (11). A regulating valve needle (12) is sealed and installed in the flow regulating cavity (11), and the regulating valve needle (12) can change the opening degree of the upper end through-hole of the guide channel (10) or the third air hole (5).
2. A blocking cylinder with adjustable resistance according to claim 1, characterized in that: The flow regulating chamber (11) is arranged directly above the connecting chamber (8), and its lower end is threadedly matched with the middle end of the regulating valve needle (12). The lower end of the regulating valve needle (12) is a conical head (13), and the conical head (13) is matched with the upper end through-opening of the guide channel (10). A first annular groove (14) is also provided above the threaded structure of the regulating valve needle (12), and a first sealing member is installed in the first annular groove (14).
3. A blocking cylinder with adjustable resistance according to claim 2, characterized in that: The top of the upper end of the guide rod (9) is matched with the upper top of the connecting cavity (8) in a gap, and the upper end of the guide channel (10) is set as a corresponding narrow part (15) to match the conical head (13), and the narrow part (15) is also provided with a radial air hole (16). The outer wall surface of the upper end of the guide rod (9) is provided with a second annular groove (17) above the narrow part (15), and the second annular groove (17) can be installed with a second sealing member.
4. A blocking cylinder with adjustable resistance according to claim 3, characterized in that: A third annular groove (18) is provided on the bottom of the lower end of the guide rod (9), and a third sealing member is installed in the third annular groove (18). A fourth annular groove (19) is provided below the threaded structure of the guide rod (9) and at the upper bottom end relative to the connecting cavity (8), and a fourth sealing member is installed in the fourth annular groove (19).
5. The blocking cylinder with adjustable resistance according to claim 1, characterized in that: The first pneumatic assembly comprises a first pneumatic piston (20) slidably matched with the first cavity, and a first pneumatic piston rod (21) slidably matched with a through hole at the center of the upper end of the first cylinder seat (1); the upper end of the spring (6) is supported in the bottom cavity of the first pneumatic piston (20); the lower end of the first pneumatic piston rod (21) is matched in the top cavity of the first pneumatic piston (20); the first pneumatic piston (20) is provided with a through hole (22) connecting the bottom cavity and the top cavity; and the bottom center of the lower end of the first pneumatic piston rod (21) is also provided with a blind hole (23).
6. The blocking cylinder with adjustable resistance according to claim 1, characterized in that: The second pneumatic assembly comprises a second pneumatic piston (24) which is sealingly and slidably matched with the second cavity, and a second pneumatic piston rod (25) which is penetrated by the second pneumatic piston (24); a chamfer (26) is arranged at the left end of the mounting hole which matches the second pneumatic piston (24) and the second pneumatic piston rod (25); a countersunk hole (27) is arranged at the center of the left end of the second pneumatic piston rod (25); the countersunk hole (27) causes the end of the second pneumatic piston rod (25) to expand radially under the action of an external tool, and the second pneumatic piston rod (25) extends to the chamfer (26) after radial expansion.