Air cylinder with swinging piston rod

Abstract

The utility model relates to an air cylinder with a swinging piston rod, which comprises an air cylinder shell, a cylinder barrel, a front cover, a rear cover and a piston transversely mounted in the cylinder barrel in a sliding manner. A first spring and a second spring are arranged on the front side and the rear side of the piston correspondingly and used for buffering impact force and adjusting motion. The piston is provided with a piston rod component extending out of the air cylinder shell and comprises an outer piston rod and an inner piston rod, the inner side of the inner piston rod is rotationally installed on the piston through a spherical connector, and the outer side of the inner piston rod is connected with a to-be-driven component. A piston rod hole is formed in the center of the front cover, a sealing ring is arranged on the hole wall, the outer piston rod is in clearance fit with the piston rod hole, friction is reduced, and gas leakage is prevented. The eccentric wear phenomenon is reduced, the sealing performance of the air cylinder is remarkably improved, the service life of the air cylinder is remarkably prolonged, meanwhile, the maintenance cost is reduced, and the air cylinder is particularly suitable for high-precision pneumatic application under complex working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic technology, and in particular relates to a cylinder with a swaying piston rod. Background Technology

[0002] In pneumatic systems, cylinders, as common actuators, are widely used in various industrial automation equipment and mechanical devices. Their main function is to convert the pressure energy of compressed air into mechanical energy, and to complete various working tasks through the reciprocating motion of the piston and piston rod. However, existing ordinary cylinders have some technical limitations in practical use, especially in the connection method between the piston and piston rod and the sealing performance.

[0003] In conventional cylinders, the piston and piston rod are typically connected by a fixed mechanical connection. While this design ensures a tight axial fit for efficient power transmission, it also restricts their relative movement. When the piston rod is subjected to lateral force, it deviates from its linear trajectory, causing uneven wear against the cylinder wall and seals. This uneven wear increases localized contact pressure on the seals, exacerbating wear, shortening their lifespan, reducing cylinder sealing performance, and ultimately leading to cylinder leakage. Cylinder leakage not only reduces work efficiency and increases operating costs but can also cause safety and environmental problems, such as wasted energy and harm to operator health and the working environment. Utility Model Content

[0004] (I) Purpose of the utility model

[0005] To overcome the above shortcomings, the purpose of this utility model is to provide a cylinder with a swaying piston rod to solve the above technical problems.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the technical solution provided in this application is as follows:

[0008] A cylinder with a swayable piston rod includes a cylinder housing, a piston that is laterally slidable inside the cylinder housing, springs that are provided between the piston and the cylinder housing on both its lateral front and rear sides, and a piston rod component extending out of the cylinder housing on the piston. The piston rod component includes an outer piston rod fixedly mounted on the piston, an inner piston rod inside the outer piston rod, the inner side of the inner piston rod being rotatably mounted on the piston, and the outer side of the inner piston rod being connected to a component to be driven.

[0009] Preferably, the cylinder housing includes a cylinder barrel and a front cover and a rear cover installed on the front and rear sides of the cylinder barrel in the lateral direction. The piston is slidably installed on the cylinder barrel. A first spring is provided between the front cover and the piston, and a second spring is provided between the piston and the rear cover.

[0010] Preferably, the front cover has a piston rod hole at its center that allows the outer piston rod to pass through, the outer piston rod is spaced apart from the piston rod hole, and at least one sealing ring is provided on the hole wall of the piston rod hole.

[0011] Preferably, the inner piston rod includes a connector disposed on the inner side and a rod body connected to the connector. The connector is spherical, and the rod body includes a first rod body connected to the connector. The front end of the first rod body is connected to a second rod body. The second rod body is frustum-shaped, and the diameter of the front end of the second rod body is smaller than the diameter of the rear end.

[0012] Preferably, the outer piston rod is fixedly mounted on the piston via a connecting seat, and a spherical connecting groove matching the spherical shape of the connecting head is formed between the connecting seat and the piston.

[0013] Preferably, the ratio of the outer diameter of the inner piston rod to the inner diameter of the outer piston is between 0.6 and 0.8.

[0014] Beneficial effects:

[0015] 1. Improved sealing performance and service life: The piston rod assembly adopts an inner and outer piston rod structure. The inner piston rod is rotatably mounted on the piston, allowing the piston rod to adjust its position by swinging when subjected to lateral forces. This avoids uneven wear between the piston rod and the sealing ring, significantly reducing seal wear and extending its service life. Simultaneously, it improves the cylinder's sealing performance and effectively prevents gas leakage. A sealing ring is installed on the wall of the piston rod bore, and the gap between the outer piston rod and the piston rod bore is designed to ensure smooth piston rod movement while further enhancing the cylinder's sealing effect, ensuring the cylinder maintains good sealing performance during long-term use.

[0016] 2. Enhanced cylinder adaptability and flexibility: The inner piston rod connector is spherical, and the outer piston rod forms a spherical connecting groove with the piston through the connecting seat. This spherical connection method allows the inner piston rod to swing freely within a certain range, further enhancing the piston rod's flexibility and adaptability. It is particularly suitable for cylinders that need to work under complex conditions, such as in environments with lateral forces or vibrations, and can effectively reduce piston rod wear and damage.

[0017] 3. Reduced maintenance costs: The piston rod's oscillating design effectively reduces wear on the sealing rings, extending their service life and thus minimizing leaks caused by seal damage. This not only improves cylinder reliability but also reduces maintenance costs associated with frequent seal replacements. The cylinder's overall structural design is rational, facilitating disassembly and maintenance, further reducing the difficulty and cost of equipment maintenance. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention;

[0019] Figure 2 This is a structural diagram of a piston rod component according to one embodiment of the present invention;

[0020] Figure 3 This is a structural diagram of an existing cylinder. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with specific embodiments and the appendix, provides further details. Figure 1-3 The present invention will be described in further detail below. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0022] This utility model provides a cylinder with a swingable piston rod, comprising a cylinder housing, within which a piston 6 is laterally slidable. Springs are provided between the piston 6 and the cylinder housing on both its lateral front and rear sides. The cylinder housing includes a cylinder barrel 5 and a front cover 3 and a rear cover 7 mounted on the lateral front and rear sides of the cylinder barrel 5, facilitating cylinder assembly and maintenance. This structural design allows for individual processing and replacement of components, reducing maintenance costs and difficulty. Simultaneously, the design of the front and rear covers provides space for spring installation, further optimizing the cylinder's structural layout.

[0023] The piston 6 is slidably mounted on the cylinder 5. A first spring 4 is provided between the front cover 3 and the piston 6, and a second spring 8 is provided between the piston 6 and the rear cover 7. This can effectively buffer the impact force generated by the piston during reciprocating motion, reduce the collision between the piston and the cylinder housing, and thus improve the smoothness of cylinder operation and service life.

[0024] The front cover 3 has a piston rod hole at its center, allowing the outer piston rod 1 to pass through. The outer piston rod 1 is spaced apart from the piston rod hole. At least one sealing ring 2 is provided on the wall of the piston rod hole. This sealing ring effectively prevents compressed gas in the cylinder from leaking through the gap between the piston rod and the hole wall, ensuring the cylinder's sealing performance. Simultaneously, the clearance between the outer piston rod and the piston rod hole reduces friction between the piston rod and the hole wall, lowering wear and further improving the cylinder's operating efficiency and service life.

[0025] The piston 6 is provided with a piston rod component extending out of the cylinder housing. The piston rod component includes an outer piston rod 1 fixedly mounted on the piston 6, and an inner piston rod 13 inside the outer piston rod 1. The inner side of the inner piston rod 13 is rotatably mounted on the piston 6, and the outer side of the inner piston rod 13 is connected to the component to be driven. The inner piston rod can automatically adjust its position by swinging when subjected to lateral force, effectively avoiding uneven wear between the piston rod and the sealing ring, significantly reducing the wear of the sealing ring, extending the service life of the sealing ring, and also improving the sealing performance and reliability of the cylinder.

[0026] The inner piston rod 13 includes a connector 9 disposed on the inner side and a rod body connected to the connector 9. The connector 9 is spherical. The rod body includes a first rod body 11 connected to the connector 9. The front end of the first rod body 11 is connected to a second rod body 12. The second rod body 12 is frustum-shaped, and the diameter of the front end of the second rod body 12 is smaller than the diameter of the rear end.

[0027] The structure of the inner piston rod not only optimizes its structural strength and connection stability but also further enhances its flexibility and adaptability. The spherical connector allows for multi-directional oscillation, enabling the inner piston rod to better cope with lateral forces and reduce uneven wear. The frustum-shaped second rod design provides greater movement space during the inner piston rod's oscillation, improving the cylinder's applicability.

[0028] The outer piston rod 1 is fixedly mounted on the piston 6 via a connecting seat 10. A spherical connecting groove is formed between the connecting seat 10 and the piston 6, which matches the spherical shape of the connecting head 9. The design of the spherical connecting groove provides stable support and precise positioning for the spherical connecting head of the inner piston rod, ensuring that the inner piston rod can swing freely within a certain range without becoming loose or falling off.

[0029] The ratio of the outer diameter of the inner piston rod to the inner diameter of the outer piston is between 0.6 and 0.8. This ratio range ensures both the free rotation of the inner piston rod within the outer piston rod and the overall strength of the piston rod assembly.

[0030] In operation, when not inflated, the piston is stationary in the middle of the cylinder under the force of the springs on both sides. When air enters through the left inflation port 14, air exits through the right inflation port 14, and the piston moves to the left. Conversely, when air enters through the right inflation port 14, air exits through the left inflation port 14, and the piston moves to the left. When the inner piston rod is subjected to a lateral force, it can rotate within the outer piston rod, thereby balancing the lateral force and preventing uneven wear.

[0031] This utility model provides a cylinder with a swingable piston rod, which significantly improves the overall performance and reliability of the cylinder through its unique structural design. The piston rod assembly adopts an inner and outer piston rod structure. The spherical connector of the inner piston rod mates with the spherical connecting groove of the outer piston rod, allowing the piston rod to automatically adjust its position when subjected to lateral force. This effectively avoids uneven wear between the piston rod and the sealing ring, significantly extending the service life of the sealing ring and improving the cylinder's sealing performance. Furthermore, springs are provided on the front and rear sides of the piston to buffer the impact force generated during reciprocating motion, reducing collisions between the piston and the cylinder housing and improving the cylinder's operational smoothness and service life. The cylinder housing adopts a split structure of cylinder barrel, front cover, and rear cover, facilitating assembly and maintenance and reducing repair costs and difficulty. A clearance is provided between the outer piston rod and the piston rod hole, and a sealing ring is provided on the hole wall to further optimize the sealing effect. The frustum-shaped design of the inner piston rod not only enhances structural strength but also facilitates connection with the driven component, improving the cylinder's applicability. Overall, the cylinder of this invention has significantly improved in terms of sealing performance, service life, adaptability and flexibility, while reducing maintenance costs. It is particularly suitable for various complex working conditions and high-requirement application scenarios, and has high practicality and market competitiveness.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A piston rod swingable cylinder, characterized in that, The device includes a cylinder housing, within which a piston is laterally slidable. Springs are provided between the piston and the cylinder housing on both its lateral front and rear sides. A piston rod component extending out of the cylinder housing is provided on the piston. The piston rod component includes an outer piston rod fixedly mounted on the piston, and an inner piston rod is provided inside the outer piston rod. The inner side of the inner piston rod is rotatably mounted on the piston, and the outer side of the inner piston rod is connected to the component to be driven.

2. A swing-piston ram air cylinder as defined in claim 1, characterized in that The cylinder housing includes a cylinder barrel and a front cover and a rear cover installed on the front and rear sides of the cylinder barrel. The piston is slidably installed on the cylinder barrel. A first spring is provided between the front cover and the piston, and a second spring is provided between the piston and the rear cover.

3. A swing-piston ram air cylinder as defined in claim 2, characterized in that The front cover has a piston rod hole at its center that allows the outer piston rod to pass through. The outer piston rod is spaced apart from the piston rod hole, and at least one sealing ring is provided on the hole wall of the piston rod hole.

4. A swing-piston ram air cylinder as defined in claim 1, wherein, The inner piston rod includes a connector on the inner side and a rod body connected to the connector. The connector is spherical. The rod body includes a first rod body connected to the connector. The front end of the first rod body is connected to a second rod body. The second rod body is frustum-shaped, and the diameter of the front end of the second rod body is smaller than the diameter of the rear end.

5. A swing-piston ram air cylinder as defined in claim 4, wherein, The outer piston rod is fixedly mounted on the piston via a connecting seat, and a spherical connecting groove is formed between the connecting seat and the piston, which matches the spherical shape of the connecting head.

6. A swing-piston ram air cylinder as defined in claim 1, wherein, The ratio of the outer diameter of the inner piston rod to the inner diameter of the outer piston is between 0.6 and 0.8.

Images