A compression fitting device for limiting deformation of a ball valve seat

Abstract

This invention provides a pressing device for limiting the deformation of a ball valve seat, belonging to the field of valves. It includes a valve body and a valve ball, with the valve ball installed inside the valve body cavity and connecting pipes installed on both sides of the valve body. A valve stem is installed on the valve ball. The invention is characterized by having an inner ring shell and an outer ring shell on both the left and right sides of the valve body, with a plurality of annular plates evenly distributed within the inner ring shell. Under the elastic force of a first spring, the fixed rod drives the annular plates to move, ensuring that the multiple annular plates are tightly pressed against the side wall of the valve ball. The first sealing ring effectively ensures the sealing between the annular plates and the valve ball. Furthermore, the multi-layered annular plate structure, utilizing the mutual support and synergy between the layers, as well as the support of the evenly distributed fixed plates, effectively disperses stress, significantly improving the overall deformation resistance of the valve seat and resulting in good performance.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a press-fit device that can limit the deformation of a ball valve seat. Background Technology

[0002] In the petroleum, chemical, and natural gas industries, ball valves are widely used due to their advantages such as simple structure, good sealing performance, and convenient operation. As a key component for achieving the sealing function of a ball valve, the performance of the valve seat directly affects the sealing effect and service life of the ball valve. In actual working conditions, the valve seat is affected by various factors such as medium pressure, temperature changes, and mechanical vibration, which can cause the valve seat to deform, thereby damaging the sealing structure and causing medium leakage. This not only wastes resources but may also lead to safety accidents. Currently, improvements to ball valve seats in existing technologies mainly focus on material selection and surface treatment processes. These improvements aim to enhance the seat's resistance to deformation and its sealing performance by using high-strength, high-wear-resistant materials or applying special surface treatments. However, these methods have significant shortcomings: First, most existing valve seats employ a single structure, which cannot effectively disperse and buffer external stresses through structural design. Under complex operating conditions, a single-structure valve seat is ill-suited to resist deformation. Second, existing devices lack a mechanism for actively adjusting the valve seat's resistance to deformation, making it impossible to apply tightening forces and prestresses according to different application environments, thus failing to meet diverse industrial needs.

[0003] Based on the above reasons, this invention proposes a pressing device that can limit the deformation of a ball valve seat, effectively disperse stress, significantly improve the overall deformation resistance of the valve seat, and flexibly adjust the pressure on the valve seat according to different application environments, further improving the deformation resistance of the ball valve seat. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pressing device that can limit the deformation of ball valve seat and has the advantage of good deformation resistance.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A pressing device for limiting the deformation of a ball valve seat includes a valve housing, a valve ball installed in the inner cavity of the valve housing, and connecting pipes installed on both sides of the valve housing. A valve stem is installed on the valve ball. An inner ring shell and an outer ring shell are provided on both the left and right sides of the valve housing. A plurality of annular plates are evenly distributed in the inner ring shell. A plurality of movable grooves are opened on the side of each annular plate away from the valve ball. A pressing component is provided in each movable groove. A plurality of pressure plates are evenly distributed in the outer ring shell. A pressing component is provided on each pressure plate. An embedding component is provided on the side wall of the outer ring shell.

[0006] Preferably, the clamping assembly includes a fixing plate, which is movably connected to the movable groove. The fixing plate has a circular groove on one side of the inner cavity of the movable groove, and a fixing rod is inserted into the circular groove. One end of the fixing rod is fixedly connected to a first spring, which is fixedly connected to the inner wall of the circular groove. The other end of the fixing rod extends out of the circular groove and is fixedly connected to the inner wall of the movable groove. The end of the fixing plate away from the fixing rod extends out of the movable groove and is fixedly connected to the inner ring shell. The fixing plates on adjacent ring plates are staggered.

[0007] Preferably, the clamping assembly includes a vertical rod, which is fixedly connected to a pressure plate, and the end of the vertical rod away from the pressure plate is movably connected to the inner wall of the outer ring shell. A movable ring is sleeved on the vertical rod, and a horizontal rod is fixedly connected to the side wall of the movable ring. A circular shell is sleeved on the outer wall of the horizontal rod, and the circular shell penetrates the outer ring shell and is fixedly connected to it. A one-way component is provided in the inner cavity of the circular shell.

[0008] Preferably, the embedded component includes a positioning rod, and a plurality of positioning rods are movably connected to the side wall of the outer ring shell. A circular plate is fixedly connected to one end of the positioning rod located in the inner cavity of the outer ring shell. A second spring is sleeved on the positioning rod, and the two ends of the second spring are fixedly connected to the circular plate and the inner wall of the outer ring shell, respectively. A plurality of positioning grooves are opened on the inner wall of the valve shell, and the end of the positioning rod away from the circular plate is inserted into the positioning groove.

[0009] Preferably, the unidirectional component includes a fixing ring, a fixing ring is fixedly connected to the inner wall of the circular shell, a vertical plate is fixedly connected to the inner wall of the fixing ring, a circular rod is movably connected to the center of the side wall of the vertical plate, a side plate and a baffle are fixedly connected to both ends of the circular rod respectively, and a third spring is sleeved on the circular rod, with both ends of the third spring fixedly connected to the side plate and the vertical plate respectively.

[0010] Preferably, the annular plate is configured to match the side wall of the valve ball on the side near the valve ball, and a first sealing ring is fixedly connected to the side of the annular plate near the valve ball.

[0011] Preferably, several annular plates are nested together, and a second sealing ring is fixedly connected to the inner sidewall of each annular plate.

[0012] Preferably, a first sliding groove is provided on the inner wall of the movable groove, and a first slider is fixedly connected to the fixed plate. The first slider is inserted into the first sliding groove and is movably connected to the first sliding groove.

[0013] Preferably, the inner wall of the outer ring shell is inclined near the valve ball, and a plurality of second sliding grooves are provided on the inner wall of the outer ring shell. The end of the vertical rod away from the pressure plate is fixedly connected to a second slider, and the second slider is movably connected to the second sliding groove.

[0014] Preferably, the inner and outer ring shells have matching annular grooves on their sidewalls, and the two annular grooves are staggered. The outer ring shell is evenly distributed with a number of fixing bolts on the side close to the inner ring shell, and the fixing bolts pass through the inner ring shell and are threadedly connected to the inner ring shell.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: This invention enables the fixed rod to move the annular plate under the elastic force of the first spring, so that the multiple annular plates are tightly attached to the side wall of the valve ball. Through the action of the first sealing ring, the sealing between the annular plate and the valve ball can be effectively ensured. Furthermore, through the multi-layer annular plate structure, the mutual support and synergy between the layers, as well as the support of the annular plate by the evenly distributed fixed plates, can effectively disperse stress and significantly improve the overall deformation resistance of the valve seat, resulting in good performance. This invention utilizes an external pressurizing device connected to a circular shell to input high-pressure gas into the shell. The high-pressure gas pushes a horizontal bar, which in turn drives a vertical bar via a movable ring. The second slider on the vertical bar moves within a second groove on the inner wall of the outer ring shell. This allows the pressure plate to continuously apply pressure to the outermost annular plate. When the pressure on the annular plate matches the pressure required for the ball valve to operate, the pressurizing device stops. At this point, the pressure plate applies a certain amount of prestress to the annular plate, effectively reducing the deformation of the ball valve seat caused by pressure differences and improving the stability of the ball valve. This invention achieves the embedding and installation of the inner and outer ring shells into the valve shell by inserting them into both sides of the valve shell and adjusting their position and rotation. This allows the positioning rod to be pushed into the positioning groove by the elastic force of the second spring, thus improving the ease of installation. Attached Figure Description

[0016] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the transverse cross-section of the present invention; Figure 3 This is a three-dimensional structural diagram of the inner ring shell of the present invention; Figure 4 This is a three-dimensional structural diagram of the outer ring shell of the present invention; Figure 5 This is a three-dimensional structural diagram of the annular plate of the present invention; Figure 6 This is the invention Figure 2 Enlarged view of point A; Figure 7 This is a three-dimensional structural diagram of the clamping assembly of the present invention; Figure 8 This is a three-dimensional structural diagram of the embedded component of the present invention; Figure 9 This is a three-dimensional structural diagram of the unidirectional component of the present invention; Figure 10 This is a three-dimensional structural diagram of the valve housing of the present invention.

[0018] 1. Valve housing; 2. Valve ball; 3. Connecting pipe; 4. Valve stem; 5. Inner ring shell; 6. Outer ring shell; 7. Annular plate; 8. Movable groove; 9. Tightening assembly; 10. Pressure plate; 11. Pressing assembly; 12. Embedding assembly; 13. Fixing plate; 14. Fixing rod; 15. First spring; 16. Vertical rod; 17. Movable ring; 18. Horizontal rod; 19. Round shell; 20. One-way assembly; 21. Positioning rod; 22. Round plate; 23. Second spring; 24. Positioning groove; 25. Fixing ring; 26. Vertical plate; 27. Round rod; 28. Side plate; 29. ​​Baffle; 30. Third spring; 31. First sealing ring; 32. Second sealing ring; 33. First sliding groove; 34. First slider; 35. Second sliding groove; 36. Second slider; 37. Fixing bolt.

[0019] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0020] The following is a detailed description of a pressing device for limiting the deformation of a ball valve seat provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0021] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0022] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0023] It is understood that the meanings of “on”, “above” and “above” in this disclosure should be interpreted in the broadest sense, such that “on” means not only “directly on” something, but also includes something with an intermediary feature or layer, and that “above” or “above” means not only “on” something, but also includes something “above” or “above” without an intermediary feature or layer.

[0024] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0025] like Figure 1-10 As shown, an embodiment of the present invention provides a pressing device that can limit the deformation of a ball valve seat, including a valve shell 1, a valve ball 2 installed in the inner cavity of the valve shell 1, and connecting pipes 3 installed on both sides of the valve shell 1. A valve stem 4 is installed on the valve ball 2. The opening and closing function of the ball valve can be realized by controlling the valve ball 2 through the valve stem 4. The valve housing 1 is provided with an inner ring shell 5 and an outer ring shell 6 on both the left and right sides. Matching annular grooves are provided on the side walls of the inner ring shell 5 and the outer ring shell 6. The two annular grooves are staggered. Several fixing bolts 37 are evenly distributed and movably connected on the side of the outer ring shell 6 near the inner ring shell 5. The fixing bolts 37 pass through the inner ring shell 5 and are threadedly connected to the inner ring shell 5, which can realize the fixed connection between the inner ring shell 5 and the outer ring shell 6, which is convenient for use. A plurality of annular plates 7 are evenly distributed within the inner ring shell 5. Each annular plate 7 has a plurality of movable grooves 8 on the side away from the valve ball 2. Each movable groove 8 is provided with a clamping component 9. The clamping component 9 includes a fixed plate 13. The fixed plate 13 is movably connected to the movable groove 8. The fixed plate 13 has a circular groove on the side of the inner cavity of the movable groove 8. A fixed rod 14 is inserted into the circular groove. A first spring 15 is fixedly connected to one end of the fixed rod 14. The first spring 15 is fixedly connected to the inner wall of the circular groove. The other end of the fixed rod 14 extends out of the circular groove and is fixedly connected to the inner wall of the movable groove 8. The fixed plate 13 extends out of the movable groove 8 on the side away from the fixed rod 14 and is fixedly connected to the inner ring shell 5. The fixed plates 13 on adjacent annular plates 7 are staggered. The side of the annular plate 7 near the valve ball 2 is matched with the side wall of the valve ball 2. A first sealing ring 31 is fixedly connected to the side of the annular plate 7 near the valve ball 2. In the technical solution of this embodiment, after the inner ring shell 5 and the outer ring shell 5 are installed in the valve shell 1, the fixing rod 14 can drive the annular plate 7 to move under the elastic force of the first spring 15, so that the multiple annular plates 7 are all tightly attached to the side wall of the valve ball 2. Through the action of the first sealing ring 31, the sealing between the annular plate 7 and the valve ball 2 can be effectively ensured. Furthermore, through the structure of the multiple annular plates 7, the mutual support and synergy between the layers, as well as the support of the annular plates 7 by the evenly distributed fixing plates 13, can effectively disperse stress, significantly improve the overall deformation resistance of the valve seat, and achieve good performance. Furthermore, several annular plates 7 are nested together, and a second sealing ring 32 is fixedly connected to the inner side wall of each annular plate 7, which can effectively improve the sealing performance between the annular plates 7 and facilitate the use of the ball valve. Furthermore, a first sliding groove 33 is provided on the inner wall of the movable groove 8, and a first slider 34 is fixedly connected to the fixed plate 13. The first slider 34 is inserted into the first sliding groove 33 and is movably connected to the first sliding groove 33, which allows the annular plate 7 to move stably within the inner ring shell 5, ensuring the sealing and pressure uniformity of the annular plate 7 and improving its resistance to deformation. A plurality of pressure plates 10 are evenly distributed inside the outer ring shell 6. Each pressure plate 10 is provided with a pressing component 11. The pressing component 11 includes a vertical rod 16, which is fixedly connected to the pressure plate 10. The end of the vertical rod 16 away from the pressure plate 10 is movably connected to the inner wall of the outer ring shell 6. A movable ring 17 is sleeved on the vertical rod 16. A horizontal rod 18 is fixedly connected to the side wall of the movable ring 17. A circular shell 19 is sleeved on the outer wall of the horizontal rod 18. The circular shell 19 penetrates the outer ring shell 6 and is fixedly connected to the outer ring shell 6. A one-way component 20 is provided in the inner cavity of the circular shell 19. The inner side wall of the outer ring shell 6 is inclined near the valve ball 2. A plurality of second sliding grooves 35 are opened on the inner wall of the outer ring shell 6. A second slider 36 is fixedly connected to the end of the vertical rod 16 away from the pressure plate 10. The second slider 36 is movably connected to the second sliding groove 35. In the technical solution of this embodiment, after the annular plate 7 and the valve ball 2 are pressed together, an external pressurizing device is connected to the circular shell 19. The pressurizing device inputs high-pressure gas into the circular shell 19. The high-pressure gas pushes the crossbar 18. The crossbar 18 drives the vertical rod 16 to move through the movable ring 17. The second slider 36 on the vertical rod 16 moves in the second sliding groove 35 on the inner wall of the outer ring shell 6. This allows the pressure plate 10 to continuously apply pressure to the outermost annular plate 7. When the pressure on the annular plate 7 matches the pressure when the ball valve is in use, the movement of the pressurizing device is stopped. At this time, the pressure plate 10 applies a certain amount of prestress to the annular plate 7, which can effectively reduce the deformation of the ball valve seat caused by the pressure difference and improve the stability of the ball valve. The one-way component 20 includes a fixed ring 25, which is fixedly connected to the inner wall of the circular shell 19. A vertical plate 26 is fixedly connected to the inner wall of the fixed ring 25. A circular rod 27 is movably connected to the center of the side wall of the vertical plate 26. A side plate 28 and a baffle 29 are fixedly connected to both ends of the circular rod 27, and a third spring 30 is sleeved on the circular rod 27. The two ends of the third spring 30 are fixedly connected to the side plate 28 and the vertical plate 26, respectively. When gas is filled, the airflow pushes the baffle 29 to move, so that the airflow enters the inner cavity of the circular shell 19 through the space between the fixed ring 25 and the baffle 29. When the circular shell 19 has a specified air pressure, the pressurization device is turned off. At this time, under the action of air pressure, the baffle 29 is pressed tightly against the side wall of the fixed ring 25, thus sealing the inner cavity of the circular shell 19, preventing gas leakage, and improving the stability of air pressure. An embedded component 12 is provided on the side wall of the outer ring shell 6. The embedded component 12 includes a positioning rod 21. Several positioning rods 21 are movably connected to the side wall of the outer ring shell 6. A circular plate 22 is fixedly connected to one end of the positioning rod 21 located in the inner cavity of the outer ring shell 6. A second spring 23 is sleeved on the positioning rod 21. The two ends of the second spring 23 are fixedly connected to the circular plate 22 and the inner wall of the outer ring shell 6, respectively. Several positioning grooves 24 are opened on the inner wall of the valve shell 1. The end of the positioning rod 21 away from the circular plate 22 is inserted into the positioning groove 24. In the technical solution of this embodiment, when installing the inner ring shell 5 and the outer ring shell 6, the inner ring shell 5 and the outer ring shell 6 are inserted into both sides of the valve shell 1, and the position and rotation of the inner ring shell 5 and the outer ring shell 6 are adjusted so that one end of the positioning rod 21 is pushed into the positioning groove 24 under the elastic force of the second spring 23. This realizes the embedding and installation operation of the inner ring shell 5 and the outer ring shell 6 in the valve shell 1, improving the convenience of installation.

[0026] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0027] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A press-fit device for limiting the deformation of a ball valve seat, comprising a valve housing (1), wherein a valve ball (2) is installed in the inner cavity of the valve housing (1), and connecting pipes (3) are installed on both sides of the valve housing (1), and a valve stem (4) is installed on the valve ball (2), characterized in that, The valve housing (1) is provided with an inner ring shell (5) and an outer ring shell (6) on both the left and right sides. Several annular plates (7) are evenly distributed in the inner ring shell (5). Several movable grooves (8) are opened on the side of each annular plate (7) away from the valve ball (2). A clamping component (9) is provided in each movable groove (8). Several pressure plates (10) are evenly distributed in the outer ring shell (6). A clamping component (11) is provided on each pressure plate (10). An embedding component (12) is provided on the side wall of the outer ring shell (6).

2. The pressing device for limiting the deformation of a ball valve seat according to claim 1, characterized in that, The clamping assembly (9) includes a fixing plate (13), which is movably connected to the movable groove (8). The fixing plate (13) has a circular groove on one side of the inner cavity of the movable groove (8). A fixing rod (14) is inserted into the circular groove. A first spring (15) is fixedly connected to one end of the fixing rod (14). The first spring (15) is fixedly connected to the inner wall of the circular groove. The other end of the fixing rod (14) extends out of the circular groove and is fixedly connected to the inner wall of the movable groove (8). The end of the fixing plate (13) away from the fixing rod (14) extends out of the movable groove (8) and is fixedly connected to the inner ring shell (5). The fixing plates (13) on adjacent ring plates (7) are staggered.

3. The pressing device for limiting the deformation of a ball valve seat according to claim 2, characterized in that, The clamping assembly (11) includes a vertical rod (16), which is fixedly connected to the pressure plate (10), and the end of the vertical rod (16) away from the pressure plate (10) is movably connected to the inner wall of the outer ring shell (6). A movable ring (17) is sleeved on the vertical rod (16), and a horizontal rod (18) is fixedly connected to the side wall of the movable ring (17). A circular shell (19) is sleeved on the outer wall of the horizontal rod (18), and the circular shell (19) penetrates the outer ring shell (6) and is fixedly connected to the outer ring shell (6). A one-way assembly (20) is provided in the inner cavity of the circular shell (19).

4. The pressing device for limiting the deformation of a ball valve seat according to claim 3, characterized in that, The embedded component (12) includes a positioning rod (21). Several positioning rods (21) are movably connected to the side wall of the outer ring shell (6). A circular plate (22) is fixedly connected to one end of the positioning rod (21) in the inner cavity of the outer ring shell (6). A second spring (23) is sleeved on the positioning rod (21). The two ends of the second spring (23) are fixedly connected to the circular plate (22) and the inner wall of the outer ring shell (6) respectively. Several positioning grooves (24) are opened on the inner wall of the valve shell (1). The end of the positioning rod (21) away from the circular plate (22) is inserted into the positioning groove (24) respectively.

5. The pressing device for limiting the deformation of a ball valve seat according to claim 4, characterized in that, The unidirectional component (20) includes a fixing ring (25), which is fixedly connected to the inner wall of the circular shell (19). A vertical plate (26) is fixedly connected to the inner wall of the fixing ring (25). A round rod (27) is movably connected to the center of the side wall of the vertical plate (26). A side plate (28) and a baffle (29) are fixedly connected to both ends of the round rod (27). A third spring (30) is sleeved on the round rod (27). The two ends of the third spring (30) are fixedly connected to the side plate (28) and the vertical plate (26) respectively.

6. The press-fit device for limiting the deformation of a ball valve seat according to claim 5, characterized in that, The annular plate (7) is matched with the side wall of the valve ball (2) on the side near the valve ball (2), and the annular plate (7) is fixedly connected with a first sealing ring (31) on the side near the valve ball (2).

7. The pressing device for limiting the deformation of a ball valve seat according to claim 6, characterized in that, Several annular plates (7) are nested together, and a second sealing ring (32) is fixedly connected to the inner sidewall of each annular plate (7).

8. The press-fit device for limiting the deformation of a ball valve seat according to claim 7, characterized in that, The inner wall of the movable groove (8) is provided with a first sliding groove (33), and a first slider (34) is fixedly connected to the fixed plate (13). The first slider (34) is inserted into the first sliding groove (33) and the first slider (34) is movably connected to the first sliding groove (33).

9. A pressing device for limiting the deformation of a ball valve seat according to claim 8, characterized in that, The inner wall of the outer ring shell (6) is inclined on the side near the valve ball (2), and a number of second sliding grooves (35) are provided on the inner wall of the outer ring shell (6). The end of the vertical rod (16) away from the pressure plate (10) is fixedly connected to a second slider (36), and the second slider (36) is movably connected to the second sliding groove (35).

10. A pressing device for limiting the deformation of a ball valve seat according to claim 9, characterized in that, The inner ring shell (5) and the outer ring shell (6) have matching annular grooves on their side walls. The two annular grooves are staggered. The outer ring shell (6) has several fixed bolts (37) evenly distributed and movably connected on the side close to the inner ring shell (5). The fixed bolts (37) penetrate the inner ring shell (5) and are threadedly connected to the inner ring shell (5).

Images