Low-friction ball type composite sliding table air cylinder

Abstract

The invention discloses a low-friction ball type composite sliding table air cylinder and relates to the technical field of air cylinders, the low-friction ball type composite sliding table air cylinder comprises a cylinder body, a piston rod is movably installed in the cylinder body, a first piston and a second piston are sequentially and fixedly installed on the surface of the piston rod, and a rear cover is fixedly installed at one end of the cylinder body; the rear cover is fixedly connected with the cylinder body through a first inner hexagon screw, a guide rail claw plate combination is fixedly installed on the side face of the cylinder body, and a guide rail positioning pin is movably installed in the guide rail claw plate combination and penetrates through the guide rail claw plate combination to be attached to the side face of the cylinder body. The air cylinder has the advantages that through cooperation of the curved bar, the strong magnet and the curved bar tooth pin, the motion posture of the piston rod can be stabilized, direct friction between the first piston and the second piston and the inner wall of the cylinder body is avoided, and compared with a traditional air cylinder without a guide structure, friction resistance is reduced, the reciprocating motion precision of the piston rod is improved, and the advantages of low friction, high stability and high reliability are achieved. And the motion precision is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of cylinder technology, specifically to a low-friction ball-type composite slide cylinder. Background Technology

[0002] In the field of pneumatic transmission, slide cylinders, as core driving components of automated equipment, are widely used in precision assembly, material handling, inspection and positioning, and other scenarios. Their operational stability, frictional resistance, and sealing performance directly determine the working accuracy and service life of the equipment. However, traditional slide cylinders have many technical shortcomings and cannot meet the stringent requirements of modern industry for "low friction, high precision, and long life." The specific problems are as follows: high frictional resistance and insufficient motion accuracy. In traditional slide cylinders, the piston and the inner wall of the cylinder are mostly in direct sliding contact, lacking an effective guiding and stabilizing structure. When the piston rod reciprocates, it is easy to deviate due to uneven force, which leads to increased friction between the piston and the cylinder wall—frictional resistance generally exceeds 15N. This not only increases the energy consumption of compressed air but also easily causes cylinder wall scratches and piston wear, resulting in a decrease in motion accuracy (reciprocating deviation can reach ±0.1mm or more). Especially in precision assembly scenarios (such as electronic component welding and micro-part handling), insufficient precision can easily lead to an increase in product defect rate and make it difficult to adapt to the needs of high-precision production. To address this, we propose a low-friction ball-type composite slide cylinder. Summary of the Invention

[0003] The purpose of this invention is to provide a low-friction ball-type composite slide cylinder.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-friction ball-bearing composite slide cylinder, comprising a cylinder body, a piston rod movably mounted inside the cylinder body, and a first piston and a second piston sequentially fixedly mounted on the surface of the piston rod; a rear cover fixedly mounted at one end of the cylinder body, and the rear cover and the cylinder body being fixedly connected by a first internal hexagon screw; a guide rail claw plate assembly fixedly mounted on the side of the cylinder body, and a guide rail positioning pin movably mounted inside the guide rail claw plate assembly, the guide rail positioning pin penetrating the guide rail claw plate assembly and fitting against the side of the cylinder body; a piston rod positioning pin fixedly mounted on the surface of the piston rod; a crank rod provided inside the cylinder body, and one end of the crank rod being movably connected to the piston rod positioning pin; a crank rod tooth pin fixedly mounted at the other end of the crank rod; and a strong magnet fixedly mounted on the inner wall of the cylinder body, the strong magnet magnetically attracting and engaging with the crank rod tooth pin.

[0005] As a further aspect of the present invention: the surface of the first piston is provided with a first orifice ring and a first flat buffer pad in sequence, and the surface of the second piston is provided with a double orifice sealing ring and a second flat buffer pad in sequence, and the first orifice ring and the double orifice sealing ring are both tightly fitted to the inner wall of the cylinder.

[0006] As a further embodiment of the present invention: the interior of the rear cover is provided with a second orifice ring and a dustproof ring, and the second orifice ring is located on the side of the dustproof ring closer to the cylinder body. The cross-section of the dustproof ring is U-shaped, and the inner wall is tightly fitted with the surface of the piston rod. The second orifice ring is in a sealed fit with the inner wall of the rear cover and the surface of the piston rod.

[0007] As a further aspect of the present invention: the guide rail claw plate assembly is fixedly connected to the cylinder body by a second internal hexagon screw, and the guide rail claw plate assembly has a positioning hole adapted to the guide rail positioning pin inside. The inner diameter of the positioning hole is equal to the outer diameter of the guide rail positioning pin, and the surface of the guide rail positioning pin is provided with anti-slip texture, and the anti-slip texture is distributed in a ring.

[0008] As a further aspect of the present invention: the surface of the crank is provided with weight-reducing holes, and the weight-reducing holes are evenly distributed along the length direction of the crank; the surface of the crank pin is provided with a wear-resistant coating, and the coating material is chromium nitride.

[0009] As a further embodiment of the present invention: a retaining ring is fixedly installed at the bottom of the cylinder body, and the retaining ring is located at the end of the piston rod away from the rear cover. The cross-section of the retaining ring is C-shaped, and the inner diameter is adapted to the outer diameter of the piston rod.

[0010] As a further aspect of the present invention: the crank rod, piston rod positioning pin, crank rod toothed pin, and strong magnet form a "guiding stability-friction reduction protection" linkage function: one end of the crank rod is movably connected to the piston rod positioning pin and can rotate synchronously with the reciprocating motion of the piston rod; the crank rod toothed pin at the other end of the crank rod maintains magnetic attraction with the strong magnet on the inner wall of the cylinder, and the rotation trajectory of the crank rod is constrained by the magnetic attraction force, thereby pulling the piston rod to always move along the cylinder axis, avoiding piston rod deviation that would cause direct friction between the first piston, the second piston, and the inner wall of the cylinder, while maintaining the stability of the piston rod's motion posture and ensuring accuracy during the reciprocating motion.

[0011] As a further aspect of the present invention: the first flat buffer pad, the second flat buffer pad, the first orifice ring, and the double orifice sealing ring form a "buffering protection-sealing enhancement" linkage function: the first flat buffer pad and the second flat buffer pad are respectively attached to the ends of the first piston and the second piston, which can buffer the impact between the piston and the inner wall of the cylinder when the piston moves to both ends of the cylinder, avoiding damage to the components caused by hard collision; at the same time, the first orifice ring and the double orifice sealing ring are respectively tightly attached to the gap between the first piston, the second piston and the inner wall of the cylinder, forming a double seal on the basis of buffering protection, preventing compressed air leakage, ensuring stable cylinder output force, and preventing impurities from entering the gap through which friction between the piston and the cylinder wall is aggravated.

[0012] As a further aspect of the present invention: the dustproof ring, the second orifice ring, the rear cover, and the piston rod form a "dustproof sealing-cylinder protection and pressure maintenance" linkage function: the dustproof ring has a U-shaped cross-section, and its inner wall is tightly fitted with the surface of the piston rod, which can prevent external dust and impurities from entering the cylinder body with the movement of the piston rod, and avoid wear caused by impurities adhering to the surface of the piston rod or the inner wall of the cylinder body; the second orifice ring located inside the dustproof ring also forms a sealing fit with the inner wall of the rear cover and the surface of the piston rod, further enhancing the sealing performance between the rear cover and the piston rod on the basis of dust prevention, preventing compressed air leakage in the cylinder body, and jointly ensuring the cleanliness and air pressure stability inside the cylinder body.

[0013] As a further aspect of the present invention: the snap ring, the guide rail claw plate assembly, and the guide rail positioning pin form a "stroke limit-installation positioning" linkage function: the snap ring has a C-shaped cross-section, which is adapted to the outer diameter of the piston rod and fixed to the bottom of the cylinder body. It can prevent the piston rod from continuing to move when it extends to the limit position, thus avoiding the component from falling off or being damaged due to excessive extension of the piston rod; the guide rail claw plate assembly is fixed to the side of the cylinder body by a second internal hexagon screw, and its internal positioning hole is adapted to the guide rail positioning pin. After the guide rail positioning pin passes through the positioning hole, it fits against the side of the cylinder body, which can accurately position the position of the cylinder body during cylinder installation, avoiding misalignment of the piston rod movement direction with the external slide mechanism due to installation misalignment. Combined with the stroke limit function of the snap ring, the overall operational reliability of the cylinder is guaranteed from both the aspects of installation accuracy and movement safety.

[0014] Compared with the prior art, the beneficial effects of the present invention by adopting the above technical solution are as follows:

[0015] 1. This invention stabilizes the movement of the piston rod by cooperating with the crank rod, strong magnet, and crank rod tooth pin, avoiding direct friction between the first and second pistons and the inner wall of the cylinder. Compared with traditional cylinders without guide structure, frictional resistance is reduced and the reciprocating motion accuracy of the piston rod is improved. It features low friction, high stability, and significantly improved motion accuracy.

[0016] 2. The present invention forms a double sealing structure by having the first orifice ring and the double orifice sealing ring respectively attached to the first piston, the second piston and the inner wall of the cylinder, thereby reducing the leakage rate, improving the sealing performance, avoiding the waste of compressed air and ensuring the stability of the cylinder output force.

[0017] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the crank pin structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the cylinder block of the present invention;

[0021] Figure 4 This is a schematic diagram of the guide rail positioning pin structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the bottom structure of the cylinder block of the present invention.

[0023] In the diagram: 1. Cylinder body; 2. Piston rod; 3. First piston; 4. Second piston; 5. Rear cover; 6. Guide rail positioning pin; 7. Crank rod; 8. Strong magnet; 9. Crank rod toothed pin; 10. First U-shaped ring; 11. First flat buffer pad; 12. Double U-shaped sealing ring; 13. Second flat buffer pad; 14. Second U-shaped ring; 15. Dustproof ring; 16. Snap ring; 17. First internal hex screw; 18. Piston rod positioning pin; 19. Guide rail claw plate assembly; 20. Second internal hex screw. Detailed Implementation

[0024] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0025] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Please see the attached Figure 1 -Attached Figure 5 This invention provides a low-friction ball-bearing composite slide cylinder, comprising a cylinder body 1, a piston rod 2 movably mounted inside the cylinder body 1, and a first piston 3 and a second piston 4 sequentially fixedly mounted on the surface of the piston rod 2, a rear cover 5 fixedly mounted on one end of the cylinder body 1, and the rear cover 5 and the cylinder body 1 are fixedly connected by a first internal hexagon screw 17, a guide rail claw plate assembly 19 fixedly mounted on the side of the cylinder body 1, and a guide rail positioning pin 6 movably mounted inside the guide rail claw plate assembly 19, the guide rail positioning pin 6 penetrating the guide rail claw plate assembly 19 and fitting against the side of the cylinder body 1, a piston rod positioning pin 18 fixedly mounted on the surface of the piston rod 2, a crank rod 7 provided inside the cylinder body 1, one end of the crank rod 7 being movably connected to the piston rod positioning pin 18, and a crank rod tooth pin 9 fixedly mounted on the other end of the crank rod 7, and a strong magnet 8 fixedly mounted on the inner wall of the cylinder body 1, and the strong magnet 8 and the crank rod tooth pin 9 being magnetically attracted to each other;

[0027] The above solution, through the cooperation between the crank 7, the strong magnet 8, and the crank pin 9, can stabilize the movement of the piston rod 2, avoiding direct friction between the first piston 3 and the second piston 4 and the inner wall of the cylinder 1. Compared with the traditional cylinder without a guide structure, the frictional resistance is reduced, and the reciprocating motion accuracy of the piston rod 2 is improved. It has the characteristics of low friction, high stability, and significantly improved motion accuracy.

[0028] like Figure 3 As shown, the surface of the first piston 3 is sequentially provided with a first orifice ring 10 and a first flat buffer pad 11, and the surface of the second piston 4 is sequentially provided with a double orifice sealing ring 12 and a second flat buffer pad 13, and the first orifice ring 10 and the double orifice sealing ring 12 are both tightly fitted to the inner wall of the cylinder body 1.

[0029] The above solution is adopted: the first orifice ring 10 and the double orifice sealing ring 12 are respectively attached to the first piston 3, the second piston 4 and the inner wall of the cylinder 1 to form a double sealing structure, which reduces the leakage rate, improves the sealing performance, avoids the waste of compressed air and ensures the stable output force of the cylinder 1.

[0030] like Figure 3 As shown, the interior of the rear cover 5 is provided with a second orifice ring 14 and a dustproof ring 15, and the second orifice ring 14 is located on the side of the dustproof ring 15 close to the cylinder body 1. The cross-section of the dustproof ring 15 is U-shaped, and the inner wall is tightly fitted with the surface of the piston rod 2. The second orifice ring 14, the inner wall of the rear cover 5, and the surface of the piston rod 2 are all sealed together.

[0031] The above solution is adopted: the dustproof ring 15 inside the rear cover 5 can block external dust and impurities from entering the cylinder 1, and avoid wear caused by dust adhering to the surface of the piston rod 2. The second orifice ring 14 further strengthens the seal between the rear cover 5 and the piston rod 2 to prevent compressed air leakage.

[0032] like Figure 3 As shown, the guide rail claw plate assembly 19 is fixedly connected to the cylinder body 1 by a second internal hex screw 20, and the guide rail claw plate assembly 19 has a positioning hole adapted to the guide rail positioning pin 6. The inner diameter of the positioning hole is equal to the outer diameter of the guide rail positioning pin 6. The surface of the guide rail positioning pin 6 is provided with anti-slip texture, and the anti-slip texture is distributed in a ring.

[0033] The above solution is adopted: by designing the positioning holes of the guide rail claw plate assembly 19 and the guide rail positioning pin 6 with the same diameter, it is ensured that the guide rail positioning pin 6 is tightly fitted with the side of the cylinder body 1, the installation position deviation of the cylinder body 1 is small, and the movement deviation of the slide table caused by installation offset is avoided.

[0034] like Figure 3 As shown, the surface of the crank 7 is provided with weight reduction holes, and the weight reduction holes are evenly distributed along the length of the crank 7. The surface of the crank pin 9 is provided with a wear-resistant coating, and the coating material is chromium nitride.

[0035] The above solution is adopted: the weight reduction hole on the surface of the crank 7 can reduce the weight of the component, reduce the driving load of the piston rod 2, save compressed air energy consumption, and the chromium nitride on the surface of the crank pin 9 improves wear resistance and avoids wear of the crank pin 9 caused by long-term adsorption friction.

[0036] like Figure 3 As shown, a retaining ring 16 is fixedly installed at the bottom of the cylinder body 1, and the retaining ring 16 is located at the end of the piston rod 2 away from the rear cover 5. The cross section of the retaining ring 16 is C-shaped, and the inner diameter is adapted to the outer diameter of the piston rod 2.

[0037] The above solution is adopted: the C-type retaining ring 16 can limit the extreme stroke of the piston rod 2, avoid damage to the components caused by excessive extension of the piston rod 2, and thus reduce the failure rate of the cylinder 1.

[0038] In this invention, the crank rod 7, piston rod positioning pin 18, crank rod toothed pin 9, and strong magnet 8 form a "guiding stability-friction reduction protection" linkage function: one end of the crank rod 7 is movably connected to the piston rod positioning pin 18 and can rotate synchronously with the reciprocating motion of the piston rod 2; the crank rod toothed pin 9 at the other end of the crank rod 7 maintains magnetic attraction with the strong magnet 8 on the inner wall of the cylinder 1, and the rotation trajectory of the crank rod 7 is constrained by the magnetic attraction force, thereby pulling the piston rod 2 to always move along the axis of the cylinder 1, avoiding the piston rod 2 from deviating and causing the first piston 3 and the second piston 4 to directly rub against the inner wall of the cylinder 1, while maintaining the stability of the piston rod 2's motion posture and ensuring the accuracy during the reciprocating motion.

[0039] In this invention, the first flat buffer pad 11, the second flat buffer pad 13, the first orifice ring 10, and the double orifice sealing ring 12 form a "buffering protection-sealing enhancement" linkage function: the first flat buffer pad 11 and the second flat buffer pad 13 are respectively attached to the ends of the first piston 3 and the second piston 4, which can buffer the impact between the piston and the inner wall of the cylinder 1 when the piston moves to both ends of the cylinder 1, avoiding damage to the components caused by hard collision; at the same time, the first orifice ring 10 and the double orifice sealing ring 12 are respectively tightly attached to the gap between the first piston 3, the second piston 4 and the inner wall of the cylinder 1, forming a double seal on the basis of buffering protection, preventing compressed air leakage, ensuring stable output force of the cylinder 1, and preventing impurities from entering between the piston and the cylinder wall through the gap and aggravating friction.

[0040] In this invention, a low-friction ball-bearing composite slide cylinder according to claim 3 is characterized in that the dustproof ring 15, the second orifice ring 14, the rear cover 5, and the piston rod 2 form a "dustproof sealing-cylinder protection and pressure maintenance" linkage function: the dustproof ring 15 has a U-shaped cross-section, and its inner wall is tightly fitted with the surface of the piston rod 2, which can prevent external dust and impurities from entering the cylinder body 1 with the movement of the piston rod 2, and avoid wear caused by impurities adhering to the surface of the piston rod 2 or the inner wall of the cylinder body 1; the second orifice ring 14 located inside the dustproof ring 15 forms a sealing fit with the inner wall of the rear cover 5 and the surface of the piston rod 2, further enhancing the sealing performance between the rear cover 5 and the piston rod 2 on the basis of dust prevention, preventing compressed air leakage in the cylinder body 1, and jointly ensuring the cleanliness and air pressure stability inside the cylinder body 1.

[0041] In this invention, the retaining ring 16, the guide rail claw plate assembly 19, and the guide rail positioning pin 6 form a "stroke limit - installation positioning" linkage function: the retaining ring 16 has a C-shaped cross-section, which is adapted to the outer diameter of the piston rod 2 and fixed to the bottom of the cylinder body 1. It can prevent the piston rod 2 from continuing to move when it extends to the limit position, thus avoiding the component from falling off or being damaged due to excessive extension of the piston rod 2; the guide rail claw plate assembly 19 is fixed to the side of the cylinder body 1 by the second internal hexagon screw 20. Its internal positioning hole is adapted to the guide rail positioning pin 6. After the guide rail positioning pin 6 passes through the positioning hole, it fits against the side of the cylinder body 1, which can accurately position the position of the cylinder body 1 during cylinder installation, avoiding the piston rod 2's movement direction from being misaligned with the external slide mechanism due to installation misalignment. Combined with the stroke limit function of the retaining ring 16, the overall operational reliability of the cylinder is guaranteed from both the aspects of installation accuracy and movement safety.

[0042] Working principle:

[0043] First piston 3 and second piston 4 are fixed sequentially to the surface of piston rod 2, ensuring that first orifice ring 10 and double orifice sealing ring 12 are tightly fitted to the surfaces of first piston 3 and second piston 4 respectively. Piston rod 2 is then inserted into cylinder 1, ensuring that first flat buffer pad 11 and second flat buffer pad 13 do not make any jamming contact with the inner wall of cylinder 1. Rear cover 5 is fixed to one end of cylinder 1 with first hex socket screw 17, ensuring that second orifice ring 14 and dustproof ring 15 inside rear cover 5 are tightly fitted to the surface of piston rod 2 without gaps. The guide rail claw plate assembly 19 is fixed to the side of the cylinder body 1 by the second internal hex screw 20. The guide rail positioning pin 6 is inserted into the positioning hole of the guide rail claw plate assembly 19 to ensure that the guide rail positioning pin 6 fits against the side of the cylinder body 1 after passing through the guide rail claw plate assembly 19. The crank rod 7 is installed inside the cylinder body 1 so that one end of the crank rod 7 is movably connected to the piston rod positioning pin 18, and the other end of the crank rod tooth pin 9 is magnetically attracted to the strong magnet 8 on the inner wall of the cylinder body 1. Finally, the retaining spring 16 is fixed at the bottom of the cylinder body 1 to limit the limit stroke of the piston rod 2.

[0044] Compressed air is introduced into cylinder 1. Observe whether there is air leakage at the first orifice ring 10, double orifice sealing ring 12, and second orifice ring 14. If there are air bubbles, the positions of the first orifice ring 10, double orifice sealing ring 12, and second orifice ring 14 need to be readjusted. Push the piston rod 2 to move back and forth. Check whether the crank rod 7 rotates synchronously with the piston rod 2 and whether the adsorption between the crank rod tooth pin 9 and the strong magnet 8 is stable. Ensure that the piston rod 2 moves without jamming and the frictional resistance is controlled within 5N. Connect cylinder 1 to the external slide mechanism. Position the cylinder 1 through the guide rail claw plate assembly 19 and the guide rail positioning pin 6 to ensure that the slide and piston rod 2 move in the same direction. Start the pneumatic control system to control the compressed air to enter both sides of cylinder 1 and drive the piston rod 2 to drive the slide to move back and forth. During the process, the adsorption between the strong magnet 8 and the crank rod tooth pin 9 stabilizes the movement posture of the piston rod 2 and avoids deviation. At the same time, the first flat buffer pad 11 and the second flat buffer pad 13 buffer the impact between the first piston 3 and the second piston 4 and cylinder 1, reducing the operating noise.

[0045] Regularly inspect the dust seal 15 at the rear cover 5. If the dust seal 15 is worn and dust enters the cylinder 1, it needs to be replaced in time. Clean the impurities on the surface of the guide rail positioning pin 6 to ensure accurate positioning. Check the wear-resistant coating on the surface of the crankshaft tooth pin 9. If the coating is peeled off, it needs to be re-sprayed with chromium nitride to maintain wear resistance. If the cylinder 1 leaks air, the rear cover 5 needs to be disassembled to check whether the first orifice ring 10 and the double orifice sealing ring 12 are aged. Replace the damaged first orifice ring 10 and double orifice sealing ring 12. If the piston rod 2 moves stuck, check whether the connection between the crankshaft 7 and the piston rod positioning pin 18 is loose, or whether there are scratches on the inner wall of the cylinder 1. After repair, reassemble and adjust to ensure that the cylinder 1 returns to a low-friction operating state.

[0046] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on.

[0047] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0049] It is obvious to those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these changes still fall within the scope of protection of the present invention.

Claims

1. A low-friction ball-type composite slide cylinder, comprising a cylinder body (1), characterized in that: A piston rod (2) is movably installed inside the cylinder (1), and a first piston (3) and a second piston (4) are sequentially fixedly installed on the surface of the piston rod (2). A rear cover (5) is fixedly installed at one end of the cylinder (1), and the rear cover (5) is fixedly connected to the cylinder (1) by a first internal hexagon screw (17). A guide rail claw plate assembly (19) is fixedly installed on the side of the cylinder (1), and a guide rail positioning pin (6) is movably installed inside the guide rail claw plate assembly (19). The positioning pin (6) passes through the guide rail claw plate assembly (19) and fits against the side of the cylinder body (1). The piston rod (2) is fixedly installed with a piston rod positioning pin (18). The cylinder body (1) is provided with a crank rod (7), and one end of the crank rod (7) is movably connected to the piston rod positioning pin (18). The other end of the crank rod (7) is fixedly installed with a crank rod tooth pin (9). The inner wall of the cylinder body (1) is fixedly installed with a strong magnet (8), and the strong magnet (8) and the crank rod tooth pin (9) are magnetically attracted to each other.

2. The low-friction ball-type composite slide cylinder according to claim 1, characterized in that: The surface of the first piston (3) is provided with a first orifice ring (10) and a first flat buffer pad (11) in sequence, and the surface of the second piston (4) is provided with a double orifice sealing ring (12) and a second flat buffer pad (13) in sequence, and the first orifice ring (10) and the double orifice sealing ring (12) are tightly fitted to the inner wall of the cylinder (1).

3. The low-friction ball-type composite slide cylinder according to claim 1, characterized in that: The rear cover (5) is provided with a second orifice ring (14) and a dustproof ring (15) inside. The second orifice ring (14) is located on the side of the dustproof ring (15) close to the cylinder (1). The cross section of the dustproof ring (15) is U-shaped, and the inner wall is tightly fitted with the surface of the piston rod (2). The second orifice ring (14) is sealed to the inner wall of the rear cover (5) and the surface of the piston rod (2).

4. The low-friction ball-type composite slide cylinder according to claim 1, characterized in that: The guide rail claw plate assembly (19) is fixedly connected to the cylinder body (1) by a second internal hex screw (20), and the guide rail claw plate assembly (19) has a positioning hole adapted to the guide rail positioning pin (6) inside. The inner diameter of the positioning hole is equal to the outer diameter of the guide rail positioning pin (6). The surface of the guide rail positioning pin (6) is provided with anti-slip texture, and the anti-slip texture is distributed in a ring.

5. A low-friction ball-type composite slide cylinder according to claim 1, characterized in that: The surface of the crank (7) is provided with weight reduction holes, and the weight reduction holes are evenly distributed along the length of the crank (7). The surface of the crank pin (9) is provided with a wear-resistant coating, and the coating material is chromium nitride.

6. A low-friction ball-type composite slide cylinder according to claim 1, characterized in that: A retaining ring (16) is fixedly installed at the bottom of the cylinder (1), and the retaining ring (16) is located at the end of the piston rod (2) away from the rear cover (5). The cross section of the retaining ring (16) is C-shaped, and the inner diameter is adapted to the outer diameter of the piston rod (2).

7. A low-friction ball-type composite slide cylinder according to claim 1, characterized in that, One end of the crank (7) is movably connected to the piston rod positioning pin (18) and rotates synchronously with the reciprocating motion of the piston rod (2); the crank tooth pin (9) at the other end of the crank (7) is magnetically attracted to the strong magnet (8) on the inner wall of the cylinder (1), and the rotation trajectory of the crank (7) is constrained by the magnetic attraction force, thereby pulling the piston rod (2) to always move along the axis of the cylinder (1).

8. A low-friction ball-type composite slide cylinder according to claim 2, characterized in that, The first flat buffer pad (11) and the second flat buffer pad (13) are respectively attached to the ends of the first piston (3) and the second piston (4). When the piston moves to both ends of the cylinder (1), the impact between the piston and the inner wall of the cylinder (1) is buffered. At the same time, the first orifice ring (10) and the double orifice sealing ring (12) are respectively tightly attached to the gap between the first piston (3), the second piston (4) and the inner wall of the cylinder (1), forming a double seal on the basis of buffer protection.

9. A low-friction ball-type composite slide cylinder according to claim 3, characterized in that, The dustproof ring (15) has a U-shaped cross section, and its inner wall is tightly fitted to the surface of the piston rod (2), preventing external dust and impurities from entering the cylinder (1) with the movement of the piston rod (2). The impurities adhere to the surface of the piston rod (2) or the inner wall of the cylinder (1), causing wear. The second orifice ring (14) located inside the dustproof ring (15) forms a sealing fit with the inner wall of the rear cover (5) and the surface of the piston rod (2), further enhancing the sealing performance between the rear cover (5) and the piston rod (2) on the basis of dust prevention.

10. A low-friction ball-type composite slide cylinder according to claim 1, characterized in that, The snap ring (16) has a C-shaped cross section, which is adapted to the outer diameter of the piston rod (2) and fixed to the bottom of the cylinder (1). When the piston rod (2) extends to the limit position, it prevents it from moving further. The guide rail claw plate assembly (19) is fixed to the side of the cylinder (1) by the second internal hex screw (20). Its internal positioning hole is adapted to the guide rail positioning pin (6). After the guide rail positioning pin (6) passes through the positioning hole, it fits against the side of the cylinder (1). When the cylinder is installed, the position of the cylinder (1) is accurately positioned, which works in conjunction with the stroke limit function of the snap ring (16).

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