Air cylinder

Abstract

The invention discloses an air cylinder, which relates to the technical field of air cylinder design and comprises a front cover, a cylinder body and a piston, a first through hole and a second through hole are formed in the cylinder body and used for air inlet and outlet. The front cover is fixedly connected with the cylinder body; the piston is arranged in the cylinder body; the device further comprises a connecting rod and a movement guide rail. The connecting rod is movably connected with the moving guide rail; hole grooves are formed in the lower end faces of the moving guide rails. An internal thread is arranged in the hole groove; a through hole is formed in the piston, and a fixing screw penetrates through the through hole to connect the movement guide rail with the piston in a threaded mode. A track of the moving guide rail is matched with steel balls in the steel ball fixing ring; the moving guide rail penetrates through the front cover and is locked in a positioning hole in the steel ball fixing ring through a positioning screw. The air leakage problem during high-frequency vibration is solved, the concentricity problem of moving parts of the air cylinder is solved, the operation stability is improved, the service life is prolonged, and smooth production is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cylinder design, and more particularly to a cylinder. BACKGROUND

[0002] At present, as a core power element in the field of industrial automation, the reliability of the pneumatic transmission device directly affects the overall operation efficiency of the equipment. The traditional cylinder structure has formed a relatively mature technical system under normal working conditions, but there are still the following technical bottlenecks under severe working conditions such as high-frequency vibration (> 50Hz) and alternating load: Most existing cylinders use a single lip seal ring structure, which is prone to the following defects during high-frequency reciprocating motion: uneven contact pressure distribution between the sealing lip and the piston rod, vibration-induced gap separation of the sealing interface, stress relaxation of the rubber material under alternating stress, elastic recovery lagging behind the motion frequency, the sealing groove design not considering the influence of vibration harmonics, and aggravating the axial movement of the sealing element. The design defects of the traditional guide structure: Single-point guide bearing layout leads to movement trajectory deviation (actual measurement data shows that the coaxiality deviation under vibration working condition can reach 0.15mm) the cooperation gap between the piston rod and the end cover bushing lacks dynamic compensation mechanism structure resonance causes second-order bending deformation, aggravating the eccentric wear of the friction pair. The chain reaction caused by the reliability defects of the system leads to the following operation abnormalities of the equipment: Leakage > 3L / min (standard working condition allowable value < 0.5L / min); Effective thrust decay rate > 25% (200 million cycle test data); The service life of the sealing element is shortened to 1 / 3 of that under normal working conditions; Abnormal vibration increases the risk of fatigue fracture of the connecting piece by 47%; Although the double-sealing structure proposed by the existing improvement scheme can improve the sealing performance in the short term, it has the following limitations: the increase of 30% friction resistance leads to an increase in energy consumption, and the rigid coupling problem in the vibration transmission path is not solved. The guide system still uses the traditional split copper sleeve structure; Therefore, it is urgent to develop a new type of cylinder structure that can achieve reliable sealing and precise guidance under vibration working conditions while maintaining high dynamic response, which has important engineering value for improving the running stability of automated equipment and reducing maintenance costs. SUMMARY

[0003] Therefore, the present application provides a cylinder to solve the air leakage problem during high-frequency vibration, solve the concentricity problem of the cylinder moving parts, improve the stability of operation, thereby increasing the service life and ensuring smooth production.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: A cylinder, comprising a front cover, a cylinder body and a piston; the cylinder body is provided with a first through hole and a second through hole for air intake and exhaust; the front cover is fixedly connected with the cylinder body; the piston is arranged inside the cylinder body; further comprising a connecting rod and a motion guide rail; the connecting rod and the motion guide rail are movably connected; the lower end surface of the motion guide rail is provided with a hole groove; the hole groove is provided with an internal thread; a through hole is formed in the piston, and a fixing screw passes through the through hole to threadedly connect the motion guide rail and the piston; the track of the motion guide rail cooperates with a steel ball in a steel ball fixing ring; the motion guide rail passes through the front cover and is locked into a positioning hole in the steel ball fixing ring through a positioning screw.

[0005] Through the above technical scheme, the beneficial effects of the present application are as follows: the special connecting structure of the pull rod, the overall stainless steel material and the integrated structure ensure the stability of the device; the front end guide rail steel ball fixing ring is improved into an overall screw, the screw is not loosened by utilizing the natural space of the cylinder body, the steel ball is prevented from falling off, and the stability of the device is greatly improved; in addition, the through hole connected with the piston and the guide rail is changed into a thread, and the guide rail and the piston are fastened by thread glue to form an overall effect, and the assembly concentricity and sealing effect are greatly improved.

[0006] On the basis of the above technical scheme, the present application can be further improved as follows.

[0007] Further, at least two sealing grooves are arranged in the front cover; a dustproof sealing ring and a first sealing ring are respectively arranged in the sealing grooves.

[0008] The above further beneficial effects are as follows: the dustproof sealing ring and the first sealing ring are added to greatly reduce the air leakage condition, and the sealing rings form a bearing effect; the concentricity is ensured, and the device moves more smoothly and smoothly; in addition, the dustproof sealing ring can prevent foreign matters from entering the interior in an environment where dust and other small foreign matters are flying.

[0009] Further, a strip-shaped hole is arranged on the motion guide rail; a mounting pin passes through the strip-shaped hole.

[0010] The above further beneficial effects are as follows: the connecting part of the motion guide rail is a vertical long hole, and can move up and down.

[0011] Further, the motion guide rail passes through a spring.

[0012] The further beneficial effect of using the spring is that it can generate a continuous and stable pressure, which is crucial for ensuring the tight fit of the internal components of the cylinder. During the operation of the machine, a certain pressure and tightness are required between the components to ensure the stability and efficiency of the entire system. The spring, through its elastic force, can effectively maintain this necessary pressure. During the operation of the machine, various impacts and vibrations often occur. The spring can effectively buffer these impacts and reduce the damage to the mechanical system. When external forces act on the cylinder, the spring can absorb part of the impact force, protecting the internal components of the cylinder from damage. In addition, after the mechanical movement is completed, the spring can also help the components to return to the initial position, preparing for the next mechanical movement. This reset function is very important for maintaining the continuity and stability of the mechanical system.

[0013] Further, the upper surface of the piston has a positioning groove adapted to the motion guide rail, and the lower surface of the piston is adapted to the nut of the fixed screw; a second sealing ring is arranged between the piston and the motion guide rail.

[0014] The further beneficial effect of using the spring is that the motion guide rail and the piston are fixed together after being fastened with thread glue, which greatly improves the assembly concentricity and sealing effect, forms a double seal with the second sealing ring, effectively reduces air leakage, and ensures the stability and reliability of the device tension.

[0015] Further, the connecting rod includes a device connecting rod and a device separation module connecting rod; the device connecting rod and the device separation module connecting rod are movably connected.

[0016] The further beneficial effect of using the spring is that the connecting rod is divided into two sections, one section is the device connecting rod, and the other section is the device separation module connecting rod, which are fixed with a pin shaft and a split pin. The device separation module connecting rod is designed with a threaded structure, a pin hole structure, and a connecting shape in the inner hole, which facilitates connection with other related components.

[0017] Further, anti-collision pad installation grooves are arranged on the upper and lower surfaces of the piston respectively; anti-collision pads are placed in the anti-collision pad installation grooves.

[0018] The further beneficial effect of using the spring is that the anti-collision pad absorbs the impact energy generated at the end of high-speed movement of the piston through the compression and rebound characteristics of elastic materials such as rubber and polyurethane, avoiding damage caused by direct impact of metal parts. The material damping characteristics can significantly reduce mechanical vibration and noise caused by the reciprocating motion of the piston, improve the smoothness of equipment operation, prevent problems such as deformation of the inner wall of the cylinder and wear of the sealing element by reducing the rigid collision of the piston and the cylinder end cover, and reduce the maintenance frequency. Further, the steel ball fixing ring comprises a first fixing ring and a second fixing ring; the first fixing ring and the second fixing ring are matched, and the steel ball is installed between the first fixing ring and the second fixing ring; the steel ball is matched with the moving guide rail, so that the steel ball rotates in a composite motion of up and down on the air inlet and the air outlet.

[0019] The further beneficial effect is that the guide steel ball is installed in two special installation hole positions of the first fixing ring, the hole has an inclination, the positioning of the steel ball is not easy to fall out, the second fixing ring is combined on the outside of the first positioning ring, the positioning hole is aligned and positioned, the combination is installed in the device front cover.

[0020] Further, the second fixing ring is provided with a positioning hole, and the positioning screw is matched with the positioning hole; the positioning screw is installed in the front cover, the outside of the front cover is wrapped by the cylinder body, the positioning screw cannot be taken out, and automatic anti-loosening is realized.

[0021] The further beneficial effect is that the steel ball is connected with the moving guide rail track, at this time, the two positioning screws are locked on the two sides of the device front cover, the positioning screw is locked into the positioning hole of the first fixing ring, and the direction is fixed.

[0022] Further, the piston side surface is provided with a sealing ring installation groove, and the third sealing ring is arranged in the sealing ring installation groove.

[0023] The further beneficial effect is that the sealing effect is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0025] Figure 1 The perspective view provided for the present application; Figure 2 The top view provided for the present application; Figure 3 The provided for the present application Figure 2 The D-D cross-sectional view; Figure 4 The explosion diagram provided for the present application.

[0026] In the diagram: 1. Device separation module connecting rod; 2. Cotter pin; 3. Device connecting rod; 4. Dustproof sealing ring; 5. First sealing ring; 6. Spring; 7. Mounting pin; 8. Motion guide rail; 9. Steel ball; 10. First fixing ring; 11. Second fixing ring; 12. Second sealing ring; 13. Fixing screw; 14. Headless fixing screw; 15. Pin shaft; 16. Front cover; 17. Fourth sealing ring; 18. Positioning screw; 19. Third sealing ring; 20. Anti-collision pad; 21. Piston; 22. Cylinder body. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1-4 As shown, an embodiment of the present invention discloses a cylinder, including a front cover 16, a cylinder body 22, and a piston 21; the cylinder body 22 is provided with a first through hole and a second through hole for air inlet and outlet; the front cover 16 is fixedly connected to the cylinder body 22, specifically by a retaining ring being held in place on the front cover and locked in place on the side by a fastening screw; the piston 21 is placed inside the cylinder body 22; it also includes: a connecting rod and a motion guide rail 8; the connecting rod and the motion guide rail 8 are movably connected; the lower end face of the motion guide rail 8 is provided with a groove; the groove is provided with an internal thread; the piston 21 is provided with a threaded hole, the fixing screw 13 is padded with an anti-loosening washer and applied with thread fixing glue, and screwed into the threaded hole to thread the motion guide rail 8 and the piston 21; the track of the motion guide rail 8 engages with the steel balls in the steel ball fixing ring; the motion guide rail 8 passes through the front cover 16 and is locked into the positioning hole on the steel ball fixing ring by a positioning screw 18.

[0029] In some specific embodiments, at least two sealing grooves are provided inside the front cover 16; the sealing grooves are respectively fitted with a dustproof sealing ring 4 and a first sealing ring 5.

[0030] Furthermore, the front cover 16 is secured by headless fixing screws 14.

[0031] In this embodiment, a dustproof sealing ring 4 is provided to prevent foreign objects from entering the interior in an environment where dust and other small foreign objects are scattered.

[0032] Furthermore, multiple first sealing rings 5 ​​are provided, which, together with the dustproof sealing ring 4, greatly reduce air leakage. The sealing rings act as bearings, making the device move more smoothly and steadily.

[0033] Furthermore, a fourth sealing ring 17 is also provided on the contact surface between the front cover 16 and the cylinder 22.

[0034] In some embodiments, a strip-shaped hole is arranged on the motion guide rail 8; the mounting pin 7 is arranged in the strip-shaped hole.

[0035] In some embodiments, the motion guide rail 8 passes through the spring 6.

[0036] In some embodiments, the upper surface of the piston 21 is provided with a positioning groove matched with the motion guide rail 8 to ensure concentricity, and the lower surface of the piston 21 is matched with the nut of the fixing screw 13; the second sealing ring 12 is arranged between the piston 21 and the motion guide rail 8.

[0037] In some embodiments, the connecting rod includes the device connecting rod 3 and the device separation module connecting rod 1; the device connecting rod 3 and the device separation module connecting rod 1 are movably connected.

[0038] Further, the device connecting rod 3 and the device separation module connecting rod 1 are fixedly connected through the pin shaft 15 and the split pin 2.

[0039] In some embodiments, the upper and lower surfaces of the piston 21 are respectively provided with the anti-collision pad 20 mounting groove; the anti-collision pad 20 is placed in the anti-collision pad 20 mounting groove.

[0040] In some embodiments, the steel ball fixing ring includes the first fixing ring 10 and the second fixing ring 11; the first fixing ring 10 and the second fixing ring 11 are matched, the steel ball 9 is arranged between the first fixing ring 10 and the second fixing ring 11; the steel ball 9 is matched with the motion guide rail 8 to make it rotate in a composite manner up and down.

[0041] In some embodiments, the second fixing ring 11 is provided with a positioning hole, and the positioning screw 18 is matched with the positioning hole; the positioning screw 18 is screwed into the front cover, the outer side of the front cover is wrapped by the cylinder body, the positioning screw 18 cannot be taken out, and automatic anti-loosening is realized.

[0042] In some embodiments, the side surface of the piston 21 is provided with a sealing ring mounting groove, and the third sealing ring 19 is arranged in the sealing ring mounting groove.

[0043] As shown in the figure, the dustproof sealing ring 4 and the two first sealing rings 5 are arranged in the inner side of the front cover 16 to play a dustproof and sealing role, and the three sealing rings can realize double sealing and better guiding; The connecting rod and the motion guide rail 8 are connected through the mounting pin 7, and the connection part of the motion guide rail 8 is a vertical long hole, so that the motion guide rail 8 can move up and down.

[0044] The combined connecting rod and the motion guide rail 8 are inserted into the front cover 16, and a spring 6 is arranged on the rear motion guide rail 8. The guide steel ball is arranged in two specially designed mounting hole positions of the first fixing ring 10, the hole has an inclination, and the positioning of the steel ball is not easy to fall out.

[0045] The second fixed ring 11 is combined with the first fixed ring 10, and the positioning holes are aligned to ensure accurate positioning. The combination is loaded into the front cover 16, and the steel ball is connected with the track of the moving guide rail 8. At this time, the two positioning screws 18 are locked on both sides of the front cover 16, and the positioning screws 18 are locked into the positioning holes of the first fixed ring 10 to fix the direction.

[0046] Two sealing grooves are also arranged on the contact surface between the front cover 16 and the cylinder body 22 to achieve sealing effect.

[0047] The screw rod of the fixing screw 13 is upward, and the spring pad and the threaded sealant are locked into the piston 21.

[0048] The third sealing ring 19 is loaded into the side sealing groove of the piston 21.

[0049] The two anti-collision pads 20 are respectively loaded into the anti-collision pad 20 installation groove on the upper and lower surfaces of the piston 21. The fixing screw 13 is coated with threaded sealant and locked into the threaded connection part at the rear end of the moving guide rail 8.

[0050] After the above combination is completed, the combined workpiece is inserted from the upper insertion device cylinder body 22, and then the clasp screw is used to fix it.

[0051] The connecting rod has two structures, namely, the integral type and the separated type. The connecting rod of the separated type is divided into two sections, one section is the device connecting rod 3, and the other section is the device separation module connecting rod 1, and the two sections are fixed by the pin shaft 15 and the split pin 2. The device separation module connecting rod 1 is designed with a threaded structure, a pin hole structure, and a required connecting shape in the inner hole, which is convenient for connecting with other related parts.

[0052] In the description of the embodiments, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0053] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cylinder comprising a front cover, a cylinder body and a piston; the cylinder body is provided with a first through hole and a second through hole for air intake and exhaust; the front cover is fixedly connected with the cylinder body; the piston is placed inside the cylinder body; characterized in that, It also includes connecting rod and motion guide; the connecting rod and the motion guide are movably connected; the lower end surface of the motion guide is provided with a hole groove; the hole groove is provided with an internal thread; the piston is provided with a through hole, and the fixing screw passes through the through hole to threadedly connect the motion guide and the piston; the track of the motion guide is matched with the steel ball in the steel ball fixing ring; the motion guide passes through the front cover and is locked into the positioning hole on the steel ball fixing ring through the positioning screw.

2. A gas cylinder as claimed in claim 1, wherein At least two sealing grooves are arranged in the front cover; the sealing grooves are respectively provided with dustproof sealing rings and first sealing rings.

3. A cylinder according to claim 1, wherein A strip-shaped hole is arranged on the motion guide; a mounting pin passes through the strip-shaped hole.

4. A cylinder according to claim 1, characterized in that The motion guide passes through the spring.

5. A cylinder according to claim 1, wherein The upper surface of the piston is provided with a positioning groove matched with the motion guide, and the lower surface of the piston is matched with the nut of the fixing screw; the second sealing ring is arranged between the piston and the motion guide.

6. A cylinder according to claim 1, wherein The connecting rod includes a device connecting rod and a device separation module connecting rod; the device connecting rod and the device separation module connecting rod are movably connected.

7. A cylinder according to claim 1, wherein Anti-collision pads are arranged in anti-collision pad mounting grooves on the upper and lower surfaces of the piston.

8. A cylinder according to claim 1, characterized in that The steel ball fixing ring includes a first fixing ring and a second fixing ring; the first fixing ring and the second fixing ring are matched, and the steel ball is arranged between the first fixing ring and the second fixing ring; the steel ball is matched with the motion guide to rotate in combination in the up-and-down direction.

9. A cylinder according to claim 8, wherein The second fixing ring is provided with a positioning hole, and the positioning screw is matched with the positioning hole.

10. A cylinder according to claim 1, characterized in that A sealing ring mounting groove is arranged on the side surface of the piston, and a third sealing ring is arranged in the sealing ring mounting groove.

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