Blade type rotating cylinder
By incorporating flexible seals and limiting ring grooves in the vane-type rotary cylinder, the problem of poor sealing is solved, achieving good sealing effect and stable output torque. The structure is reasonably designed and easy to install.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-04-03
AI Technical Summary
Existing vane-type rotary cylinders have poor sealing performance during use, resulting in serious air leakage and affecting the output torque.
Flexible first and second seals are connected to the blade and the limiting block respectively to form a sealing fit and prevent gas leakage; at the same time, a third seal is provided to form a seal with the rotating shaft and the through hole to prevent gas leakage; and the installation strength and sealing performance of the component are improved by the convex ring and the limiting ring groove.
It effectively prevents gas leakage inside the cylinder, ensuring the stability of output torque and sealing effect. The structure is reasonably designed and the installation is simple and secure.
Smart Images
Figure CN224079391U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cylinder technology, and in particular to a vane-type rotary cylinder. Background Technology
[0002] A rotary cylinder is a pneumatic actuator that reciprocates within a range of less than 360°. It uses compressed air to drive an output shaft to rotate within a certain angle range, and is used for tasks such as rotating, flipping, sorting, clamping, opening and closing valves, and robotic arm movements. Rotary cylinders are divided into vane-type and gear-type rotary cylinders. Vane-type rotary cylinders change their swing angle through internal stop blocks or external stops. The stop blocks are fixed to the cylinder body, and the vanes are connected to the rotating shaft. Air enters the cylinder through the intake pipe, and then acts on the vanes, thereby driving the rotating shaft to rotate and output torque. However, existing vane-type rotary cylinders have poor sealing during use, and air leakage is prone to occur in the chambers on both sides of the cylinder relative to the stop blocks and vanes, resulting in poor torque output. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a vane-type rotary cylinder that is not prone to gas leakage during use, has a good sealing effect, thus effectively ensuring the output torque, and has a reasonable structure.
[0004] The technical solution adopted by this utility model to solve its technical problem is a vane-type rotary cylinder, including a cylinder body and a rotating shaft. The rotating shaft is vertically rotatably mounted on the cylinder body. The cylinder body has a rotating cavity, and a limiting block is detachably fixedly installed in the rotating cavity. A vane is fixedly installed on the rotating shaft in the rotating cavity. The limiting block is used to limit the rotation angle of the vane. The cylinder body also has a first air hole and a second air hole. By introducing an air source into the first air hole or the second air hole, the vane and the rotating shaft are driven to rotate. The rotating cavity also has a sealing assembly, which includes a flexible first sealing element and a flexible second sealing element. The first sealing element is connected to the vane, and the first sealing element forms a sealing fit between the vane and the rotating cavity and the rotating shaft. The second sealing element is connected to the limiting block, and the second sealing element is arranged opposite to the first air hole and the second air hole. The second sealing element forms a sealing fit between the limiting block and the rotating cavity and the rotating shaft.
[0005] In the above scheme, air is introduced through the first vent, and the incoming gas acts on the blades, causing the blades to rotate the shaft in the forward direction. Simultaneously, air is exhausted through the second vent. The blades rotate in the forward direction until they form a limiting engagement with one side of the limiting block. Correspondingly, when air is introduced through the second vent, air is exhausted simultaneously through the first vent, causing the blades to rotate the shaft in the reverse direction until they form a limiting engagement with the other side of the limiting block. This achieves angular rotation of the blades within the rotating cavity. The first seal seals the gaps between the blades and the rotating cavity and shaft, thereby preventing phase leakage within the rotating cavity. The second seal prevents gas from leaking between the two sides of the blade through the gap between the blade and the rotating cavity and shaft. This seal prevents gas from leaking between the two sides of the rotating cavity relative to the limit block through the gap between the blade and the rotating cavity and shaft, ensuring that the gas source introduced from the first or second air hole can effectively act on the blade. Therefore, by setting the first and second seals, the device is less prone to gas leakage during use, thus effectively ensuring the output torque, resulting in good performance and a reasonable structure.
[0006] Furthermore, the sealing assembly also includes two flexible third seals. Through holes are formed at the center of both the upper and lower ends of the rotating cavity. The through holes cooperate with the rotating shaft. The third seals are arranged opposite to the upper and lower ends of the first seals. The third seals form a sealing fit between the rotating shaft and the through holes. The third seals and the first seals are an integral structure and are respectively injection molded and connected to the rotating shaft and the blade.
[0007] In the above scheme, by setting two third seals, the two third seals can form a seal at the fit gap between the rotating shaft and the through hole, thereby preventing the gas in the rotating cavity from leaking into the external gas through the fit gap between the rotating shaft and the through hole. At the same time, the third seals can also prevent water leakage at the connection between the rotating shaft and the through hole, resulting in better sealing and better performance. In addition, the third seals and the first seals are made into an integral structure and are connected to the rotating shaft and blades by injection molding. This makes the installation of the first and third seals more reasonable and also improves their performance.
[0008] Furthermore, a convex ring is provided on the rotating shaft within the rotating cavity, and an axial mounting recess is provided on the peripheral wall surface of the convex ring. The blade is fastened to the mounting recess, the first seal covers the mounting recess, and the convex ring also provides support and positioning for the third seals at both ends.
[0009] In the above solution, the convex ring with the mounting recess allows the blade to be connected to the rotating shaft by welding it into the mounting recess, thereby improving the fit strength between the rotating shaft and the blade. The first seal also covers the connection between the blade and the rotating shaft, achieving good sealing protection. At the same time, the convex ring also provides support and positioning for the third seal, so that the integrated third seal and the first seal are effectively positioned, resulting in better overall performance.
[0010] Furthermore, the first sealing member has a first sealing lip along its surface, the first sealing lip being used to connect the rotating cavity, and at least one first sealing lip is provided.
[0011] In the above solution, by setting a first sealing lip and cooperating with the rotating cavity, the frictional resistance between the first sealing element and the rotating cavity is reduced while ensuring the sealing effect of the first sealing element, resulting in better performance and a reasonable structural design.
[0012] Furthermore, a limiting ring groove is formed around the limiting block along the axial direction, and the second seal is injection molded and connected to the limiting ring groove. The second seal has a second sealing lip along its surface. The second sealing lip is used to connect the rotating cavity, and there is at least one second sealing lip.
[0013] In the above scheme, by setting a limiting ring groove on the limiting block, the installation position of the second seal is limited, avoiding the phenomenon of the second seal shifting position during the rotation of the shaft, thus ensuring safety in use. Furthermore, by setting a second sealing lip, the cooperation between the second sealing lip and the shaft reduces the frictional resistance between the second seal and the shaft while ensuring the sealing effect of the second seal, resulting in better performance and a reasonable structural design.
[0014] Furthermore, a first notch and a second notch are respectively provided at corresponding positions on both sides of the upper and lower ends of the limiting block. The first notch cooperates with the first air hole, and the second notch cooperates with the second air hole.
[0015] In the above scheme, by setting the first notch and the second notch, the first air hole and the second air hole can be avoided, which can ensure the rotation angle of the blade and allow the gas to be quickly discharged or discharged. During installation, there is no need to identify the upper and lower installation directions of the limit block. The molding is also simple and convenient, and the structural design is reasonable.
[0016] Furthermore, the cylinder body includes an upper cylinder seat and a lower cylinder seat connected as one piece by a fastening device, and the upper cylinder seat and the lower cylinder seat are provided with a mounting ring groove and a mounting ring edge at the splice, with the mounting ring edge inserted into the mounting ring groove.
[0017] In the above scheme, the cylinder body is set as a split structure, which facilitates the installation of the limiting block and rotating shaft inside the cylinder body. By setting the mounting ring groove and mounting ring edge for insert fitting, the accurate installation of the upper cylinder seat and the lower cylinder seat is achieved. The contact between the rotating cavity and the first seal and the second seal is uniform and reasonable, and it also facilitates the use of the fastening device.
[0018] Furthermore, the upper and lower ends of the limiting block are both provided with a first insertion post and a second insertion post, and the corresponding positions of the upper cylinder seat and the lower cylinder seat are provided with a first insertion hole and a second insertion hole. The first insertion post cooperates with the first insertion hole, and the second insertion post cooperates with the second insertion hole.
[0019] In the above scheme, during installation, the first and second pins at the lower end of the limiting block are aligned with the first and second pins on the lower cylinder seat and inserted. After insertion, the first and second pins on the upper cylinder seat are aligned with the first and second pins at the upper end of the limiting block. Once installed, the limiting block is positioned, making the installation simple and providing a good fixing effect. At the same time, it also makes the installation and matching of the lower and upper cylinder seats more accurate.
[0020] Furthermore, bearings are provided at both ends of the rotating shaft, and the bearings are located inside the rotating cavity.
[0021] In the above scheme, the bearing configuration makes the rotation of the shaft on the cylinder block more stable and the performance better. Attached Figure Description
[0022] Figure 1 Cross-sectional view of the overall structure of this utility model Figure 1 ;
[0023] Figure 2 Cross-sectional view of the overall structure of this utility model Figure 2 ;
[0024] Figure 3 This is a partial structural schematic diagram of the present invention;
[0025] Figure 4 This is a schematic diagram of the rotating shaft structure of this utility model;
[0026] Figure 5 This is a schematic diagram of the structure of the first and third sealing elements of this utility model;
[0027] Figure 6 This is a schematic diagram of the limiting block structure of this utility model;
[0028] Figure 7 This is a schematic diagram of the second sealing element structure of this utility model;
[0029] Figure 8This is a schematic diagram of the lower cylinder seat structure of this utility model;
[0030] Figure 9 This is a schematic diagram of the upper cylinder seat structure of this utility model.
[0031] In the diagram: 1-Cylinder body, 2-Rotating shaft, 3-Rotating cavity, 4-Limiting block, 5-Blade, 6-First air hole, 7-Second air hole, 8-First seal, 9-Second seal, 10-Third seal, 11-Through hole, 12-Protruding ring, 13-Mounting recess, 14-First sealing lip, 15-Limiting ring groove, 16-Second sealing lip, 17-First notch groove, 18-Second notch groove, 19-Upper cylinder seat, 20-Lower cylinder seat, 21-Mounting ring groove, 22-Mounting ring edge, 23-First insert, 24-Second insert, 25-First insertion hole, 26-Second insertion hole, 27-Bearing. Detailed Implementation
[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model and / or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort. Furthermore, references to orientation only indicate the relative positional relationship between the components, not their absolute positional relationship.
[0033] Please see Figures 1 to 9 As shown, a vane-type rotary cylinder includes a cylinder body 1 and a rotating shaft 2. The rotating shaft 2 is vertically rotatably mounted on the cylinder body 1. A rotating cavity 3 is provided inside the cylinder body 1. A limiting block 4 is detachably and fixedly installed inside the rotating cavity 3. A vane 5 is fixedly mounted on the rotating shaft 2 within the rotating cavity 3. The limiting block 4 is used to limit the rotation angle of the vane 5. A first air hole 6 and a second air hole 7 are also provided through the cylinder body 1. Air is introduced into the first air hole 6 or the second air hole 7 to drive the vane 5 and the rotating shaft 2 to rotate. In the above structure... By allowing air to enter through the first air hole 6, the incoming gas acts on the blade 5, causing the blade 5 to drive the rotating shaft 2 to rotate in the forward direction. At the same time, the second air hole 7 will simultaneously exhaust the gas. The blade 5 rotates in the forward direction until it forms a limiting engagement with one side of the limiting surface of the limiting block 4. Correspondingly, when air enters through the second air hole 7, the first air hole 6 simultaneously exhausts the gas, causing the blade 5 to drive the rotating shaft 2 to rotate in the reverse direction. The blade 5 rotates in the reverse direction until it forms a limiting engagement with the other side of the limiting block 4, thereby realizing the angular rotation of the blade 5 within the rotating cavity 3.
[0034] In this embodiment, a sealing assembly is also provided inside the rotating cavity 3. More specifically, the sealing assembly includes a flexible first sealing element 8 and a flexible second sealing element 9. The first sealing element 8 is connected to the blade 5, forming a sealing fit between the blade 5 and the rotating cavity 3 and the rotating shaft 2. The second sealing element 9 is connected to the limiting block 4, and is positioned between the first air hole 6 and the second air hole 7, forming a sealing fit between the limiting block 4 and the rotating cavity 3 and the rotating shaft 2. In the above structure, the first sealing element 8 can seal the gap between the blade 5 and the rotating cavity 3 and the rotating shaft 2, thereby preventing gas from passing through the blade 5 and the rotating cavity 3 and the rotating shaft 2 from the sides opposite to the blade 5 inside the rotating cavity 3. The second seal 9 prevents air leakage at the joint gap between the limiting block 4 and the rotating cavity 3 and the rotating shaft 2. This seal prevents air from leaking between the two sides of the rotating cavity 3 relative to the limiting block 4 through the joint gap between the blade 5 and the rotating cavity 3 and the rotating shaft 2. This ensures that the air source introduced from the first air hole 6 or the second air hole 7 can effectively act on the blade 5. Therefore, by setting the first seal 8 and the second seal 9, the device is less prone to air leakage during use, thus effectively ensuring the output torque. It has good performance and reasonable structure. Moreover, during the rotation of the blade 5 and the rotating shaft 2, the first seal 8 and the second seal 9 always maintain a seal with the rotating cavity 3 and the rotating shaft 2.
[0035] In this embodiment, the sealing assembly further includes two flexible third seals 10. Through holes 11 are formed at the center of both the upper and lower ends of the rotating cavity 3, and these through holes 11 mate with the rotating shaft 2. The third seals 10 are positioned relative to the upper and lower ends of the first seal 8, ensuring a sealing fit between the rotating shaft 2 and the through holes 11. The third seals 10 and the first seal 8 are integrally formed and injection-molded onto the rotating shaft 2 and the blade 3, respectively. In this structure, by providing two third seals 10, the two third seals 10 can seal the gap between the rotating shaft 2 and the through holes 11. The seal prevents gas inside the rotating cavity 3 from leaking into the external gas through the gap between the rotating shaft 2 and the through hole 11. At the same time, the third seal 10 can also prevent water leakage at the connection between the rotating shaft 2 and the through hole 11, resulting in better sealing and better performance. The third seal 10 and the first seal 8 are integrated into one structure and are connected to the rotating shaft 2 and the blade 5 by injection molding. This makes the installation of the first seal 8 and the third seal 10 more reasonable and improves their performance. The first seal 8 is also designed to wrap around the blade 5.
[0036] In this embodiment, a convex ring portion 12 is provided on the rotating shaft 2 within the rotating cavity 3. An axial mounting recess 13 is provided on the peripheral wall surface of the convex ring portion 12. The blade 5 is fastened to the mounting recess 13. The first sealing member 8 covers the mounting recess 13, and the convex ring portion 12 also provides support and positioning for the third sealing members 10 at both ends. In the above structure, with the convex ring portion 12 having the mounting recess 13, the blade 5 can be connected to the rotating shaft 2 by welding it into the mounting recess 13, thereby improving the fit strength between the rotating shaft 2 and the blade 5. The first sealing member 8 also covers the connection between the blade 5 and the rotating shaft 2, achieving good sealing protection. At the same time, the convex ring portion 12 also provides support and positioning for the third sealing member 10, so that the integrated third sealing member 10 and the first sealing member 8 are effectively positioned, resulting in better overall performance.
[0037] In this example, the first sealing member 8 is provided with a first sealing lip 14 along its surface. The first sealing lip 14 is used to connect the rotating cavity 3, and there is at least one first sealing lip 14. In the above structure, by providing the first sealing lip 14, the frictional resistance between the first sealing member 8 and the rotating cavity 3 is reduced while ensuring the sealing effect of the first sealing member 8. The effect is better and the structural design is reasonable.
[0038] In this example, a limiting annular groove 15 is formed around the limiting block 4 along the axial direction. The second seal 9 is injection molded and connected to the limiting annular groove 15. A second sealing lip 16 is provided on the surface of the second seal 9. The second sealing lip 16 is used to connect the rotating cavity 3, and there is at least one second sealing lip 16. In the above structure, by setting the limiting annular groove 15 on the limiting block 4, the installation position of the second seal 9 is limited, avoiding the phenomenon of the second seal 9 shifting position during the rotation of the rotating shaft 2, thus ensuring the safety of use. Furthermore, by setting the second sealing lip 16, the cooperation between the second sealing lip 16 and the rotating shaft 2 reduces the frictional resistance between the second seal 9 and the rotating shaft 2 while ensuring the sealing effect of the second seal 9, resulting in better performance and a reasonable structural design.
[0039] In this embodiment, the limiting block 4 has a symmetrical structure. The first notch 17 and the second notch 18 are respectively provided at corresponding positions on both sides of the upper and lower ends of the limiting block 4. The first notch 17 cooperates with the first air hole 6, and the second notch 18 cooperates with the second air hole 7. In the above structure, by setting the first notch 17 and the second notch 18, the first air hole 6 and the second air hole 7 can be avoided, which can ensure the rotation angle of the blade 5 and allow the gas to be discharged quickly. The first notch 17 and the second notch 18 set at the same end are symmetrical, and the first notch 17 and the second notch 18 set at the upper and lower ends are also symmetrical. Therefore, it is not necessary to identify the installation direction of the upper and lower ends of the limiting block 4 during installation, and the molding is simple and convenient, and the structural design is reasonable.
[0040] In this embodiment, the cylinder body 1 includes an upper cylinder seat 19 and a lower cylinder seat 20 connected as a single unit by a fastening device. The upper cylinder seat 19 and the lower cylinder seat 20 are also provided with an installation ring groove 21 and an installation ring edge 22 at the splice. The installation ring edge 22 is inserted into the installation ring groove 21. In the above structure, the cylinder body 1 is set as a split structure, which facilitates the installation of the limiting block 3 and the rotating shaft 3 inside the cylinder body 1. By setting the installation ring groove 21 and the installation ring edge 22 for insertion and matching, the accurate installation of the upper cylinder seat 19 and the lower cylinder seat 20 is achieved, so that the contact between the rotating cavity 3 and the first seal 8 and the second seal 9 is uniform and reasonable. The upper cylinder seat 19 and the lower cylinder seat 20 after insertion will not have a large misalignment, which also facilitates the use of the fastening device. The fastening device can be a fastening screw fixed by a screw. The first air hole 6 and the second air hole 7 are also formed on the lower cylinder seat 20.
[0041] In this embodiment, the upper and lower ends of the limiting block 4 are each provided with a first insertion post 23 and a second insertion post 24. The upper cylinder seat 19 and the lower cylinder seat 20 are each provided with a first insertion hole 25 and a second insertion hole 26 at corresponding positions. The first insertion post 23 cooperates with the first insertion hole 25, and the second insertion post 24 cooperates with the second insertion hole 26. During installation, the first insertion post 23 and the second insertion post 24 at the lower end of the limiting block 4 are aligned with the first insertion hole 25 and the second insertion hole 26 on the lower cylinder seat 20 and inserted. After insertion, the first insertion hole 25 and the second insertion hole 26 on the upper cylinder seat 19 are aligned with the first insertion post 23 and the second insertion post 24 at the upper end of the limiting block 4. After installation, the position of the limiting block 4 can be limited. The installation is simple and the fixing effect is good. At the same time, it also makes the installation and matching of the lower cylinder seat 20 and the upper cylinder seat 19 more accurate and facilitates the use of the fastening device.
[0042] In this embodiment, the first insertion post 23 and the second insertion post 24 are arranged on both sides of the second sealing member 9. At the same time, the first insertion post 23 and the second insertion post 24 at the same end are symmetrical, and the first insertion post 23 and the second insertion post 24 at the upper and lower ends are also symmetrical.
[0043] In this embodiment, bearings 27 are provided at both ends of the rotating shaft 2. The bearings 27 are located in the rotating cavity 3. The arrangement of the bearings 27 makes the rotation of the rotating shaft 2 on the cylinder 1 more stable and the performance better.
[0044] In this embodiment, a waterproof and breathable membrane can also be fixedly installed on the inner wall of the first vent 6 and the inner wall of the second vent 7. By setting the waterproof and breathable membrane, water can be effectively prevented from entering through the first vent 6 and the second vent 7.
[0045] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.
Claims
1. A rotary vane cylinder comprising a cylinder body (1) and a rotary shaft (2) vertically rotatably arranged in the cylinder body (1), a rotary cavity (3) being arranged in the cylinder body (1), a limiting block (4) being detachably and fixedly arranged in the rotary cavity (3), a vane (5) being fixedly arranged on the rotary shaft (2) in the rotary cavity (3), the limiting block (4) being used for limiting the rotation angle of the vane (5), a first air hole (6) and a second air hole (7) being further arranged in the cylinder body (1), the vane (5) and the rotary shaft (2) being driven to rotate by inputting a gas source into the first air hole (6) or the second air hole (7), a sealing assembly being further arranged in the rotary cavity (3), characterized in that: The sealing assembly comprises a flexible first sealing piece (8) connected to the vane (5), which forms a sealing fit between the vane (5) and the rotating cavity (3) and the rotating shaft (2), and a flexible second sealing piece (9) connected to the limiting block (4) and arranged between the first air hole (6) and the second air hole (7), which forms a sealing fit between the limiting block (4) and the rotating cavity (3) and the rotating shaft (2).
2. A vane-type rotary air cylinder according to claim 1, characterized in that: The sealing assembly further comprises two flexible third sealing pieces (10), through holes (11) are formed at the centers of the upper and lower ends of the rotating cavity (3) and matched with the rotating shaft (2), the third sealing pieces (10) are arranged at the upper and lower ends of the first sealing piece (8), which form a sealing fit between the rotating shaft (2) and the through holes (11), and the third sealing pieces (10) are integrally formed with the first sealing piece (8) and respectively connected to the rotating shaft (2) and the vane (5) by injection molding.
3. A vane-type rotary air cylinder according to claim 2, characterized in that: Therefore, a convex ring part (12) is arranged in the rotating cavity (3) of the rotating shaft (2), an installation recess (13) is arranged on the circumferential wall surface of the convex ring part (12) in the axial direction, the vane (5) is tightly connected in the installation recess (13), the first sealing piece (8) covers the installation recess (13), and the convex ring part (12) further supports and positions the third sealing pieces (10) at the two ends.
4. A vane-type rotary air cylinder according to claim 3, characterized in that: A first sealing lip (14) is arranged on the surface of the first sealing piece (8), which is used to connect the rotating cavity (3), and at least one first sealing lip (14) is arranged.
5. A vane-type rotary air cylinder according to claim 1, characterized in that: A limiting ring groove (15) is formed on the limiting block (4) in the axial direction, the second sealing piece (9) is connected to the limiting ring groove (15) by injection molding, a second sealing lip (16) is arranged on the surface of the second sealing piece (9), which is used to connect the rotating cavity (3), and at least one second sealing lip (16) is arranged.
6. A vane-type rotary air cylinder according to claim 1, characterized in that: First and second notched grooves (17) and (18) are respectively arranged at the corresponding positions on the two sides of the upper and lower ends of the limiting block (4), the first notched groove (17) is matched with the first air hole (6), and the second notched groove (18) is matched with the second air hole (7).
7. A vane-type rotary air cylinder according to claim 1, characterized in that: The cylinder body (1) comprises an upper cylinder base (19) and a lower cylinder base (20) connected as a whole by fastening devices, and the upper cylinder base (19) and the lower cylinder base (20) are further provided with an installation ring groove (21) and an installation ring edge (22) at the splicing position, and the installation ring edge (22) is inserted into the installation ring groove (21).
8. A vane-type rotary air cylinder according to claim 7, characterized in that: The upper and lower ends of the limiting block (4) are provided with a first inserting column (23) and a second inserting column (24), the upper cylinder seat (19) and the lower cylinder seat (20) are provided with a first inserting hole (25) and a second inserting hole (26) at corresponding positions, the first inserting column (23) is matched with the first inserting hole (25), and the second inserting column (24) is matched with the second inserting hole (26).
9. A vane-type rotary air cylinder according to claim 1, characterized in that: Both ends of the rotating shaft (2) are provided with a bearing (27), and the bearing (27) is located in the rotating cavity (3).