Rotary long-stroke air cylinder

Abstract

The utility model discloses a rotary long-stroke air cylinder which comprises a sleeve, a piston rod, a piston, a cylinder cover, a guide assembly and a rotary driving assembly. The piston is slidably sealed in an inner cavity of the sleeve, the piston rod is connected with the piston and penetrates out of the sleeve cover, and air inlets and air outlets are formed in the two sides of the sleeve. The guide assembly comprises a guide base, a guide rod and a fixed disc, the guide base is rotationally arranged in the sleeve, one end of the guide rod is connected with the guide base, the other end penetrates through a piston guide hole to be connected with the fixed disc, and the guide hole is in sliding sealing fit with the guide rod; the rotation driving assembly is connected with the guiding base and drives the guiding base to rotate. The cylinder achieves accurate rotation of the piston rod through the rotary driving assembly, and the application range is expanded; the guide assembly prevents the piston from rotating during movement, the telescopic stability and precision of the piston rod are ensured, the equipment failure risk is reduced, the service life is prolonged, the requirements of industrial automation for functional diversification and high precision of the air cylinder are met, and the practical and popularization value is high.

Description

A rotary long-stroke cylinder Technical Field

[0001] This utility model relates to the field of cylinder technology, specifically to a rotary long-stroke cylinder. Background Technology

[0002] In the field of industrial automation, long-stroke cylinders are widely used as important actuators in machining, automated assembly, material handling, and many other scenarios. Traditional long-stroke cylinders mainly consist of components such as a sleeve, piston rod, piston, and cylinder cover. The inlet and outlet of gas are controlled by the inlet and outlet ports on both sides of the sleeve to realize the extension and retraction of the piston rod, thereby completing the corresponding work task.

[0003] However, with the continuous development of industrial technology, the functional requirements for cylinders are becoming increasingly diversified. In some specific working scenarios, cylinders are not only required to achieve long-stroke linear extension and retraction, but also to perform precise rotational movements to meet complex process requirements. Existing long-stroke cylinder structures, lacking effective rotary drive and guiding control mechanisms, struggle to achieve precise piston rod rotation. Furthermore, during piston movement, uneven force distribution can easily cause piston rod rotation, leading to unnecessary rotation during extension and retraction, affecting working accuracy and equipment stability. In addition, when piston rod rotation is required, existing cylinder structures cannot accurately control the rotation angle and speed, failing to meet the demands of high-precision operations. Therefore, there is an urgent need to design a long-stroke cylinder capable of achieving piston rod rotation while ensuring motion accuracy. Summary of the Invention

[0004] In view of the shortcomings of the prior art, this utility model provides a rotary long-stroke cylinder.

[0005] The technical solution adopted by this utility model is: a rotary long-stroke cylinder, including a sleeve, a piston rod, a piston, and a cylinder cover. The cylinder cover is connected to an opening at one end of the sleeve. The piston is slidably and sealingly connected to the inner cavity of the sleeve. One end of the piston rod is fixedly connected to the piston, and the other end extends toward one end of the cylinder cover and passes through the cylinder cover. Air inlet and outlet ports are provided on both sides of the sleeve. It also includes a guide assembly and a rotary drive assembly. The guide assembly includes a guide base, a guide rod, and a fixed disk. The rotary drive assembly is connected to the guide base for driving the guide base to rotate.

[0006] The guide base is rotatably mounted inside the sleeve cavity. One end of the guide rod is fixedly connected to the guide base, and the other end passes through the guide hole on the piston and is fixedly connected to the fixed plate. The guide hole and the guide rod are in sliding sealing fit.

[0007] Furthermore, the guide base is a cylindrical structure with an annular groove on its outer ring, and a sliding sleeve is installed in the annular groove.

[0008] Furthermore, the guide rod has threaded sections at both ends and fixing nuts that are threadedly connected to the threaded sections, and the guide base and the fixing plate are both provided with fixing holes that are fixedly engaged with the threaded sections.

[0009] Furthermore, the rotary drive assembly is a rotary cylinder fixed on the sleeve.

[0010] Furthermore, the rotary cylinder includes an upper cylinder body, a lower cylinder body, a rotary piston, and a rotating rod. A cavity for mounting the rotary piston is formed between the upper cylinder body and the lower cylinder body. One end of the rotating rod extends into the rotary hole of the upper cylinder body and connects to the rotary piston, while the other end is fixedly connected to the guide base. The rotating rod is rotatably sealed with the rotary hole on the cylinder body. The upper cylinder body is provided with an air inlet and an air outlet that communicate with the cavity.

[0011] Furthermore, a positioning block is also provided in the cavity of the upper cylinder and the lower cylinder. The pins on both sides of the positioning block are connected to the pin holes on the upper cylinder and the lower cylinder. A limiting surface is provided on one side of the positioning block.

[0012] Furthermore, a sealing ring is provided between the guide rod and the guide hole.

[0013] The beneficial effects of this utility model are:

[0014] Firstly, the rotary drive assembly provides a reliable power source for the piston rod's rotation, enabling it to rotate precisely according to actual work requirements. This effectively solves the problem of traditional cylinders struggling to achieve precise piston rod rotation, greatly expanding the application range of cylinders in complex process scenarios. On automated production lines requiring multi-angle machining or assembly of workpieces, this cylinder can precisely control the piston rod's rotation angle and speed, achieving linear conveying and rotary motion of the product.

[0015] Secondly, the design of the guide assembly plays a crucial role. The guide base is rotatably mounted within the sleeve cavity, with one end of the guide rod fixedly connected to the guide base and the other end passing through a guide hole on the piston and fixedly connected to the fixed plate. The guide hole and guide rod are in a sliding, sealed fit. This structure effectively prevents the piston from rotating during movement within the sleeve cavity, fundamentally eliminating unnecessary rotation caused by piston rotation during piston rod extension and retraction, significantly improving the stability and working accuracy of the cylinder movement. Even during long-stroke extension and retraction, it ensures that the piston rod always moves along a predetermined straight trajectory, reducing equipment wear and malfunction risks caused by movement deviations and extending the cylinder's service life.

[0016] In summary, this rotary long-stroke cylinder, through the coordinated work of the rotary drive component and the guide component, achieves both precise rotation of the piston rod and ensures high precision and stability of the telescopic motion, meeting the diverse and high-precision needs of cylinders in the field of industrial automation. It has high practical value and promising market prospects.

[0017] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of this utility model.

[0020] Figure 2 is a cross-sectional schematic diagram of this utility model.

[0021] Figure 3 is an exploded view of the rotary drive assembly.

[0022] Figure 4 is an exploded view of the guide assembly.

[0023] In Figure 1-4: 1. Sleeve; 2. Piston rod; 3. Piston; 4. Cylinder cover; 5. Air inlet and outlet; 6. Rotary drive assembly; 7. Guide base; 8. Guide rod; 9. Fixing plate; 10. Guide hole; 11. Annular groove; 12. Sliding sleeve; 13. Threaded section; 14. Fixing nut; 15. Fixing hole; 16. Upper cylinder body; 17. Lower cylinder body; 18. Rotating piston; 19. Rotating rod; 20. Cavity; 21. Air inlet; 22. Air outlet; 23. Positioning block; 24. Pin; 25. Pin hole; 26. Sealing ring; 27. Limiting surface. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] This utility model provides a rotary long-stroke cylinder.

[0027] In this embodiment, referring to Figures 1-4, the rotary long-stroke cylinder includes a sleeve 1, a piston rod 2, a piston 3, and a cylinder cover 4. The cylinder cover 4 is connected to an opening at one end of the sleeve. The piston is slidably and sealingly connected to the inner cavity of the sleeve. One end of the piston rod is fixedly connected to the piston, and the other end extends toward one end of the cylinder cover and passes through the cylinder cover. Air inlet and outlet ports 5 are provided on both sides of the sleeve. It also includes a guide assembly and a rotary drive assembly 6. The guide assembly includes a guide base 7, a guide rod 8, and a fixed disk 9. The rotary drive assembly is connected to the guide base 7 to drive the guide base to rotate.

[0028] The guide base is rotatably disposed within the inner cavity of the sleeve. One end of the guide rod is fixedly connected to the guide base, and the other end passes through the guide hole 10 on the piston 3 and is fixedly connected to the fixed plate. The guide hole and the guide rod are in sliding sealing fit.

[0029] In the above technical solution, the newly added guiding component and rotary drive component work together. The rotary drive component drives the guide base to rotate, and the guide base is connected to the fixed plate through a guide rod passing through the piston guide hole. The guide hole and the guide rod are in sliding sealing fit. When the rotary drive component is working, the guide base rotates and drives the guide rod. Since the guide rod restricts the rotational freedom of the piston, the piston can only move linearly along the inner cavity of the sleeve. The rotation of the guide rod is ultimately transmitted to the piston rod, so that the piston rod can be rotated in a controlled manner during the extension and retraction process.

[0030] This structural design breaks through the limitations of traditional cylinders that can only extend and retract linearly, enabling the piston rod to rotate and expanding the application range of cylinders. In automated assembly, machining, and other scenarios, it can meet the needs of multi-angle operation of workpieces. Simultaneously, the guide assembly ensures the linear movement of the piston, preventing rotation due to uneven force during movement. This ensures the accuracy and stability of the piston rod's extension and retraction, reduces the risk of equipment failure due to movement deviations, and improves work efficiency and product quality.

[0031] Specifically, the guide base is a cylindrical structure with an annular groove 11 on its outer ring, and a sliding sleeve 12 is installed in the annular groove.

[0032] In the above technical solution,

[0033] In this embodiment, the sliding sleeve significantly reduces the frictional resistance during the rotation of the guide base, making the rotation of the guide base easier and smoother. At the same time, the reduced friction effectively avoids problems such as guide base jamming and wear caused by excessive friction, enhances the stability and reliability of the guide base rotation, extends the service life of the guide assembly and the entire cylinder, and ensures the long-term stable operation of the cylinder.

[0034] Specifically, the guide rod has threaded sections 13 at both ends and fixing nuts 14 that are threaded to the threaded sections 13. The guide base and the fixing plate are both provided with fixing holes 15 that are fixedly engaged with the threaded sections.

[0035] In this embodiment, the threaded connection facilitates the installation, disassembly, and maintenance of the guide assembly. When the guide assembly malfunctions or requires replacement, the operation can be performed quickly, saving maintenance time and labor costs. Simultaneously, the tightness of the threaded connection ensures that the guide rod will not loosen with the guide base and fixed plate during the transmission of rotational force and restriction of piston rotation, guaranteeing the stability and reliability of the guide assembly and making the entire cylinder system safer and more reliable.

[0036] Specifically, the rotary drive assembly is a rotary cylinder fixed on the sleeve.

[0037] In this embodiment, the rotary cylinder, as a rotary drive component, has advantages such as compact structure, stable power output, and convenient control. It can provide stable and controllable rotational power to the piston rod. By adjusting parameters such as intake pressure, flow rate, and intake time, the rotation angle and speed of the piston rod can be precisely controlled, meeting the accuracy requirements for piston rod rotation under different working conditions. This enables the cylinder to accurately perform tasks in complex processes, improving its applicability and performance.

[0038] Specifically, the rotary cylinder includes an upper cylinder body 16, a lower cylinder body 17, a rotary piston 18, and a rotating rod 19. A cavity 20 for mounting the rotary piston is formed between the upper and lower cylinder bodies. One end of the rotating rod extends into the rotating hole of the upper cylinder body and connects to the rotary piston, while the other end is fixedly connected to the guide base. The rotating rod is rotatably sealed with the rotating hole on the cylinder body. The upper cylinder body is provided with an air inlet 21 and an air outlet 22 that communicate with the cavity.

[0039] In this embodiment, the rotary cylinder consists of an upper cylinder body, a lower cylinder body, a rotary piston, and a rotating rod. The upper and lower cylinder bodies form a closed cavity to accommodate the rotary piston. One end of the rotating rod passes through a rotating hole in the upper cylinder body and connects to the rotary piston, while the other end is fixedly connected to the guide base. The rotating rod and the rotating hole are rotatably sealed to prevent gas leakage. The air inlet and outlet of the upper cylinder body are connected to the cavity. When gas enters the cavity through the air inlet, it pushes the rotary piston to move within the cavity. The rotary piston drives the rotating rod to rotate, and the rotating rod transmits the rotational motion to the guide base, realizing the rotation of the guide base and the piston rod. When the gas is discharged through the air outlet, the rotary piston resets under the action of a reset force or the gas pressure on the other side, preparing for the next rotation.

[0040] Specifically, a positioning block 23 is also provided in the cavity of the upper cylinder and the lower cylinder. The pins 24 on both sides of the positioning block are connected to the pin holes 25 on the upper cylinder and the lower cylinder. A limiting surface 27 is provided on one side of the positioning block.

[0041] In this embodiment, positioning blocks are installed within the cavities of the upper and lower cylinders, with pins on both sides of the positioning blocks connected to pin holes on the upper and lower cylinders. When the rotating piston moves within the cavity, the positioning blocks restrict the piston's range of motion, allowing for rotation control at different angles as needed. As clearly shown in the accompanying drawings, the positioning block of this application has a semi-circular structure, occupying half of the central cavity. The side of the positioning block forms a limiting surface, restricting the piston to a maximum rotation of 180 degrees. Those skilled in the art can design positioning blocks with different structures based on this structural principle to achieve rotation requirements at different angles.

[0042] Specifically, a sealing ring 26 is provided between the guide rod and the guide hole.

[0043] In this embodiment, the sealing ring ensures the sealing of the sleeve cavity, maintains stable internal air pressure in the cylinder, and ensures that the cylinder can work normally and perform at its best.

[0044] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A rotary long-stroke cylinder, comprising a sleeve, a piston rod, a piston, and a cylinder cover, wherein the cylinder cover is connected to an opening at one end of the sleeve, the piston is slidably and sealingly connected to the inner cavity of the sleeve, one end of the piston rod is fixedly connected to the piston, and the other end extends toward one end of the cylinder cover and passes through the cylinder cover; inlet and outlet ports are provided on both sides of the sleeve, characterized in that: It also includes a guide assembly and a rotary drive assembly. The guide assembly includes a guide base, a guide rod, and a fixed disk. The rotary drive assembly is connected to the guide base to drive the guide base to rotate. The guide base is rotatably disposed inside the sleeve cavity. One end of the guide rod is fixedly connected to the guide base, and the other end passes through the guide hole on the piston and is fixedly connected to the fixed disk. The guide hole and the guide rod are in a sliding sealing fit.

2. The rotary long-stroke cylinder according to claim 1, characterized in that: The guide base is a cylindrical structure with an annular groove on its outer ring, and a sliding sleeve is installed in the annular groove.

3. The rotary long-stroke cylinder according to claim 1, characterized in that: The guide rod has threaded sections at both ends and fixing nuts that are threadedly connected to the threaded sections. The guide base and the fixing plate are both provided with fixing holes that are fixedly engaged with the threaded sections.

4. The rotary long-stroke cylinder according to claim 1, characterized in that: The rotary drive assembly is a rotary cylinder fixed on the sleeve.

5. The rotary long-stroke cylinder according to claim 4, characterized in that: The rotary cylinder includes an upper cylinder body, a lower cylinder body, a rotary piston, and a rotating rod. A cavity for mounting the rotary piston is formed between the upper and lower cylinder bodies. One end of the rotating rod extends into the rotary hole of the upper cylinder body and connects to the rotary piston, while the other end is fixedly connected to the guide base. The rotating rod is rotatably sealed to the rotary hole on the cylinder body. The upper cylinder body is provided with an air inlet and an air outlet that communicate with the cavity.

6. The rotary long-stroke cylinder according to claim 5, characterized in that: The upper and lower cylinder bodies are also provided with positioning blocks. The pins on both sides of the positioning blocks are connected to the pin holes on the upper and lower cylinder bodies. A limiting surface is provided on one side of the positioning block.

7. The rotary long-stroke cylinder according to claim 5, characterized in that: A sealing ring is provided between the guide rod and the guide hole.

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