A fixture for rotary body turning and milling composite machining

Abstract

The application relates to the technical field of rotary body machining clamps, and particularly discloses a clamp for rotary body turning and milling composite machining, which comprises a fixed shell, a connecting shell detachably connected to the fixed shell, a through groove formed in the connecting shell, a guide piece fixedly connected in the through groove of the connecting shell, a sliding block slidingly connected to the guide piece, and an extrusion block detachably connected to the sliding block; four connecting pieces are arranged on the lower side of the sliding block and are fixedly connected to the sliding block, and the connecting pieces are provided with limiting portions; a threaded column is rotationally connected to the connecting shell, the threaded column is threadedly connected with a spline sleeve, the spline sleeve is spline-connected with a connecting plate, and a fixed rod is fixedly connected to the inner top of the connecting shell. The limiting block and the limiting portions of the connecting pieces are matched to form mechanical limiting after normal clamping of a driving mechanism. Even if abnormal conditions such as interruption of air supply, leakage or hydraulic failure occur, the limiting assembly can still prevent the sliding block from moving reversely, so that the extrusion block can continuously clamp the part.

Description

Technical Field

[0001] This invention relates to the field of rotary machining fixtures, and more specifically, to a fixture for rotary turning and milling combined machining. Background Technology

[0002] In the mill-turn machining of rotary parts, fixtures are key process equipment to ensure part positioning accuracy and machining safety. Traditional rotary machining fixtures typically use pneumatic or hydraulic drives for clamping and unclamping, which improves clamping efficiency, but still has the following shortcomings: During the use of the fixture, if the air supply is interrupted, the pipeline leaks, or the hydraulic system suddenly fails, the original clamping force will be lost quickly or even instantly, causing the parts to lose their fixation immediately. If this is during milling, it is very easy for the tool to collide with the workpiece, the parts will be scrapped due to loosening and displacement, or even serious machining accidents such as damage to the spindle or turret.

[0003] In view of this, the present invention proposes a fixture for combined turning and milling machining of rotary bodies. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a fixture for rotary milling and turning to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fixture for rotary milling and turning composite machining, comprising: a fixed shell, wherein the fixed shell is detachably connected to a connecting shell, the connecting shell has a through groove, a guide member is fixedly connected in the through groove of the connecting shell, the guide member is slidably connected to a slider, and the slider is detachably connected to a pressing block; Four connectors are provided, each fixed to the lower side of the slider, and each connector is provided with a limiting part; A threaded column is rotatably connected to the connecting shell. The threaded column is threadedly connected to a spline sleeve, and the spline sleeve is spline-connected to a connecting plate. A fixing rod is fixedly connected to the inner top of the connecting shell. The fixing rod passes through the connecting plate, and a spring is fixedly connected between the fixing rod and the connecting plate. A limiting component is disposed on the connecting plate, and the limiting component limits the limiting portion of the connecting member; A driving mechanism is disposed on the fixed housing, and the driving mechanism is used to drive the slider to slide along the guide member.

[0006] Furthermore, the lower part of the spline sleeve is provided with an annular protrusion, which limits the position of the connecting plate.

[0007] Furthermore, the limiting component includes four support blocks, which are circumferentially and equally spaced and fixed to the connecting plate. The support blocks are slidably connected to limiting blocks, which limit the limiting portion of the connecting member.

[0008] Furthermore, the support block has a through groove, and a support plate is slidably connected in the through groove of the support block. The support plate is fixedly connected to the limiting block, and a sliding rod is fixedly connected to the support plate. The sliding rod passes through the support block, and a spring is fixedly connected between the support block and the support plate.

[0009] Furthermore, the limiting block is wedge-shaped, and the limiting part of the connector is inclined on the side near the connecting plate.

[0010] Furthermore, the drive mechanism includes a bottom cover, which is detachably fixed to the lower side of the fixed shell. A sealing disc is fixed inside the fixed shell. A piston rod is slidably connected between the sealing disc and the bottom cover. The piston rod is dynamically sealed to the sealing disc and the bottom cover. A piston disc is fixed to the piston rod, and the piston disc is dynamically sealed to the inner wall of the fixed shell.

[0011] Furthermore, the piston rod has two stepped surfaces, and a connecting ring is slidably connected between the two stepped surfaces of the piston rod. A hinge is hinged between the connecting ring and the connecting member.

[0012] Furthermore, a connecting frame is fixedly connected to the lower side of the connecting plate, and a push rod is fixedly connected between the connecting frame and the piston rod, with the push rod abutting against the connecting frame.

[0013] Furthermore, the fixed shell is fixedly connected to and communicates with two air nozzles, and the communication points between the two air nozzles and the fixed shell are located on the upper and lower sides of the piston disc, respectively.

[0014] Furthermore, a magnetic ring one is fixedly connected to the lower side of the connecting ring, and a magnetic ring two is fixedly connected to the upper side of the sealing disc, with the magnetic ring one and the magnetic ring two being magnetically connected.

[0015] Compared with the prior art, the present invention provides a fixture for milling and turning of a rotating body, which has the following advantages: 1. Through the cooperation of the limiting block and the limiting part of the connecting piece, a mechanical limit is formed after the drive mechanism clamps normally. Even in the event of abnormal situations such as interruption of air supply, leakage or hydraulic failure, the limiting component can still prevent the slider from moving in the opposite direction, ensuring that the extrusion block continues to clamp the parts, effectively avoiding serious accidents such as tool collision, parts scrapping or equipment damage caused by loss of clamping force.

[0016] 2. The slider and the extrusion block are detachably connected. When the diameter of the part changes, the position of the extrusion block can be quickly adapted by simply replacing or adjusting it without changing the main structure of the fixture, which improves the versatility and flexible processing capability of the fixture.

[0017] 3. For special working conditions such as pipe parts, when the drive mechanism fails and cannot automatically release the clamp, the threaded column can be rotated with a hex wrench to move the spline sleeve and connecting plate upwards, separating the limit block from the connecting parts, and then the clamping block can be manually pushed to loosen the parts. This design provides a reliable emergency escape route and enhances the maintainability and safety of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a fixture for rotary milling and turning machining according to the present invention; Figure 2 This is a cross-sectional view of the fixed shell and the connecting shell in this invention; Figure 3 This is a schematic diagram of the structure of the guide and slider in this invention; Figure 4 This is a schematic diagram of the connecting ring and hinge in this invention; Figure 5 This is a schematic diagram of the connecting frame and the top rod in this invention; Figure 6 This is a cross-sectional view of the spline sleeve and connecting plate in this invention. Figure 7 This is a cross-sectional view of the support block in this invention. Figure 8 This is a cross-sectional view of the piston rod and connecting ring in this invention.

[0019] In the diagram: 1. Fixed shell; 2. Connecting shell; 3. Guide component; 4. Slider; 5. Extrusion block; 6. Connecting component; 7. Limiting part; 8. Threaded column; 9. Spline sleeve; 10. Connecting plate; 11. Fixed rod; 12. Spring 1; 13. Support block; 14. Limiting block; 15. Support plate; 16. Sliding rod; 17. Spring 2; 18. Bottom cover; 19. Sealing disc; 20. Piston rod; 201. Piston disc; 21. Connecting ring; 22. Hinge component; 23. Connecting frame; 24. Top rod; 25. Air nozzle; 26. Magnetic ring 1; 27. Magnetic ring 2. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0023] This invention provides a fixture for milling and turning machining of rotary bodies, such as... Figures 1-8 As shown, it includes: a fixed shell 1, a connecting shell 2, a guide 3, a slider 4, a pressing block 5, a connecting piece 6, a limiting part 7, a threaded column 8, a spline sleeve 9, a connecting plate 10, a fixing rod 11, a spring 12, a limiting assembly, and a driving mechanism. A fixed shell 1 is detachably connected to a connecting shell 2. The connecting shell 2 has a through groove, and a guide 3 is fixedly connected to the through groove of the connecting shell 2. The guide 3 is slidably connected to a slider 4, and the slider 4 is detachably connected to a pressing block 5. Four connecting parts 6 are provided, which are fixedly connected to the lower side of the slider 4 respectively. The connecting parts 6 are provided with a limiting part 7. A threaded column 8 is rotatably connected to the connecting shell 2. The threaded column 8 is threadedly connected to a spline sleeve 9. The spline sleeve 9 is splinedly connected to a connecting plate 10. A fixing rod 11 is fixedly connected to the inner top of the connecting shell 2. The fixing rod 11 passes through the connecting plate 10. A spring 12 is fixedly connected between the fixing rod 11 and the connecting plate 10. A limiting component is provided on the connecting plate 10. The limiting component limits the limiting part 7 of the connecting parts 6. A driving mechanism is provided on the fixed shell 1. The driving mechanism is used to drive the slider 4 to slide along the guide 3. An annular protrusion is provided on the lower part of the spline sleeve 9. The annular protrusion of the spline sleeve 9 limits the connecting plate 10.

[0024] When machining a rotating body by turning and milling, the part is placed on the upper side of the connecting shell 2. The four sliders 4 are driven to move closer to each other by the drive mechanism. The sliders 4 drive the extrusion block 5 to slide along the guide 3 until the extrusion block 5 clamps the part. When the diameter of the part changes, only the position of the extrusion block 5 needs to be changed.

[0025] Before the four sliders 4 approach and interact with each other, the connecting plate 10 slides down along the spline sleeve 9 under the elastic force of the spring 12. The connecting plate 10 stops moving downward when it contacts the lower annular protrusion of the spline sleeve 9. During the process of the four sliders 4 approaching and moving towards each other, the sliders 4 drive the connecting piece 6 to move synchronously until the limiting component limits the connecting piece 6, thereby preventing the extrusion block 5 from losing its fixation on the part after the drive mechanism fails, thus preventing a processing accident.

[0026] After the part is processed, the control drive mechanism drives the connecting plate 10 to move upward and reset, so that the limiting component no longer limits the limiting part 7 of the connecting piece 6. The drive mechanism then drives the four sliders 4 to move away from each other, and the four pressing blocks 5 no longer press on the part.

[0027] like Figures 1-5 and Figure 8 As shown, the limiting assembly includes: support block 13, limiting block 14, support plate 15, sliding rod 16 and spring 17; Four support blocks 13 are provided, and the four support blocks 13 are fixed to the connecting plate 10 at equal intervals around the circumference. The support blocks 13 are slidably connected to the limiting blocks 14, and the limiting blocks 14 limit the limiting part 7 of the connecting member 6. The support blocks 13 have through slots, and the support plate 15 is slidably connected in the through slots of the support blocks 13. The support plate 15 is fixedly connected to the limiting blocks 14, and the support plate 15 is fixedly connected to the sliding rod 16, which passes through the support blocks 13. A spring 17 is fixedly connected between the support blocks 13 and the support plate 15. The limiting blocks 14 are wedge-shaped, and the limiting part 7 of the connecting member 6 is inclined on the side near the connecting plate 10.

[0028] When the connecting plate 10 slides downward along the spline sleeve 9, it drives the four support blocks 13 and their limiting components to move downward. After the connecting plate 10 stops moving, the slider 4 drives the connecting piece 6 to move synchronously. The limiting part 7 of the connecting piece 6 presses against the limiting block 14, and the limiting block 14 moves upward along the support block 13. The limiting block 14 drives the support plate 15 to move upward along the through groove of the support block 13. The support plate 15 drives the sliding rod 16 to slide along the support block 13, and the second spring 17 is compressed. When the limiting part 7 of the connecting piece 6 no longer presses against the limiting block 14, the limiting block 14 slides downward along the support block 13 to reset under the elastic force of the second spring 17. The limiting block 14 limits the limiting part 7 of the connecting piece 6.

[0029] like Figures 1-4 As shown, the drive mechanism includes: a bottom cover 18, a sealing disc 19, a piston rod 20, a piston disc 201, a connecting ring 21, a hinge 22, a connecting frame 23, a push rod 24, an air nozzle 25, a magnetic ring one 26, and a magnetic ring two 27. The bottom cover 18 is detachably fixed to the lower side of the fixed shell 1. A sealing disc 19 is fixed inside the fixed shell 1. A piston rod 20 is slidably connected between the sealing disc 19 and the bottom cover 18. The piston rod 20 is dynamically sealed to the sealing disc 19 and the bottom cover 18. A piston disc 201 is fixedly connected to the piston rod 20, and the piston disc 201 is dynamically sealed to the inner wall of the fixed shell 1. The piston rod 20 has two stepped surfaces, and a connecting ring 21 is slidably connected between the two stepped surfaces of the piston rod 20. The connecting ring 21 is connected to the connecting... Hinged member 22 is hinged between parts 6; a connecting frame 23 is fixed to the lower side of the connecting plate 10, and a push rod 24 is fixed to the piston rod 20, with the push rod 24 abutting against the connecting frame 23; two air nozzles 25 are fixed to and connected to the fixed shell 1, with the connection points between the two air nozzles 25 and the fixed shell 1 located on the upper and lower sides of the piston disc 201, respectively; a magnetic ring 26 is fixed to the lower side of the connecting ring 21, and a magnetic ring 27 is fixed to the upper side of the sealing disc 19, with magnetic ring 26 and magnetic ring 27 being magnetically connected.

[0030] In use, the two air pipes of the air pump are connected to the two air nozzles 25 respectively. The air pump alternately supplies air to both sides of the piston disc 201 through the two air nozzles 25, driving the piston rod 20 to move. When air is injected into the upper side of the piston disc 201, the piston disc 201 and the piston rod 20 slide downward. The piston rod 20 drives the push rod 24 to move downward. At this time, the connecting ring 21 and the piston rod 20 slide relative to each other. Under the elastic force of the spring 12, the connecting plate 10 slides downward until the connecting plate 10 contacts the annular protrusion of the spline sleeve 9. The piston disc 201 and the piston rod 20 continue to move downward. The upper stepped surface of the piston rod 20 contacts the connecting ring 21. The piston rod 20 drives the connecting ring 21 to move downward through the upper stepped surface. The connecting ring 21 drives the slider 4 to slide along the guide 3 through the hinge 22. The slider 4 drives the connecting piece 6 to move synchronously, so that the limiting block 14 limits the limiting part 7 of the connecting piece 6.

[0031] After the clamping block 5 clamps and fixes the part, magnetic ring 26 and magnetic ring 27 are in contact. When it is necessary to release the fixation of the part, air is injected into the lower side of the piston disc 201, while the air on the upper side of the piston disc 201 is expelled. The piston rod 20 and the piston disc 201 slide upward. Under the magnetic force between magnetic ring 26 and magnetic ring 27, the connecting ring 21 slides relative to the piston rod 20, and the connecting ring 21 separates from the upper stepped surface of the piston rod 20. The piston rod 20 drives the push rod 24 to move upward. 4. The connecting frame 23 is squeezed, causing the connecting frame 23 to move the connecting plate 10 upward. The spring 12 is compressed, and the connecting plate 10 moves the limiting block 14 upward through the support block 13. The limiting block 14 separates from the limiting part 7 of the connecting member 6. The piston rod 20 continues to move upward until the lower step surface of the piston rod 20 contacts the connecting ring 21. The piston rod 20 moves the connecting ring 21 upward, and the connecting ring 21 drives the slider 4 to reset through the hinge 22. The magnetic ring 1 26 and the magnetic ring 27 separate from each other.

[0032] In use, if air leakage or other problems occur, the limiting block 14 is used to limit the limiting part 7 of the connecting part 6. Even if the piston rod 20 loses its pulling force on the connecting ring 21, the pressing block 5 can always clamp the part, thereby preventing the part from losing its fixation and causing a production accident caused by the collision between the milling cutter and the part.

[0033] When it is necessary to release the clamping block 5 from the part, the piston rod 20 can be pushed to reset, so that the slider 4 can be reset. If the part is a pipe, the threaded column 8 can be rotated with a hex wrench. The threaded column 8 drives the spline sleeve 9 to move upward through the thread. The spline sleeve 9 drives the connecting plate 10 to move upward, so that the limiting block 14 is separated from the limiting part 7 of the connecting part 6. Then the clamping block 5 is pushed to separate the clamping block 5 from the part. Then the threaded column 8 is rotated in the opposite direction to reset the spline sleeve 9 to the initial position.

[0034] Working principle of the invention: When the rotating part needs to be machined by turning, the part is placed on the upper side of the connecting shell 2. Compressed air is injected into the upper side of the piston disc 201 inside the fixed shell 1 through two air nozzles 25 by an external air pump, while the air under the piston disc 201 is discharged, so that the piston disc 201 and the piston rod 20 slide downward. The piston rod 20 drives the push rod 24 to move downward. At this time, the piston rod 20 slides relative to the connecting ring 21. The connecting plate 10 slides downward along the spline sleeve 9 under the elastic force of the spring 12 until the connecting plate 10 abuts against the annular protrusion at the lower part of the spline sleeve 9 and stops moving.

[0035] The piston rod 20 continues to move downwards until the upper step surface contacts the connecting ring 21 and pulls the connecting ring 21 downwards. The connecting ring 21 drives the four sliders 4 to move closer to each other along the guide 3 through the hinge 22. The sliders 4 drive the pressing block 5 to move synchronously until the pressing block 5 clamps the part. During the process of the sliders 4 moving closer to each other, the connecting piece 6 on the lower side of the slider 4 moves synchronously. The limiting part 7 of the connecting piece 6 contacts and presses the wedge-shaped limiting block 14, pushing the limiting block 14 to move upwards along the support block 13. At the same time, it drives the support plate 15 and the sliding rod 16 to slide, and the second spring 17 is compressed. When the connecting piece 6 continues to move until its limiting part 7 passes the limiting block 14, the connecting piece 6 no longer presses the limiting block 14. The second spring 17 returns to its original position and pushes the limiting block 14 to slide downwards, so that the limiting block 14 locks the limiting part 7 of the connecting piece 6, forming a mechanical limit. At this time, even if the drive mechanism fails due to air supply interruption or air leakage, the limit component can still prevent the slider 4 from moving in the opposite direction, ensuring that the extrusion block 5 continues to clamp the part and prevent processing accidents.

[0036] When the piston rod 20 moves downward to its end point, the magnetic ring 26 on the lower side of the connecting ring 21 contacts the magnetic ring 27 on the upper side of the sealing disc 19 and forms a magnetic connection. When the clamping needs to be released after the part is processed, compressed air is injected into the lower side of the piston disc 201 by an air pump, while the air on the upper side of the piston disc 201 is discharged, causing the piston disc 201 and piston rod 20 to slide upward. The piston rod 20 drives the push rod 24 to move upward. The push rod 24 first pushes the connecting frame 23, overcoming the elastic force of the spring 12, causing the connecting plate 10 to move upward. The spring 12 is compressed, and the connecting plate 10 drives the limiting block 14 to move upward through the support block 13, causing the limiting block 14 to separate from the limiting part 7 of the connecting piece 6. The piston rod 20 continues to move upward, and the piston rod 20 drives the connecting ring 21 to move upward synchronously through the lower step surface. The connecting ring 21 pulls the four sliders 4 along the guide 3 to move away from each other through the hinge 22, and the squeezing block 5 is separated from the surface of the part, completing the reset. After the piston rod 20 moves further upward, the magnetic ring 26 and the magnetic ring 27 overcome the magnetic force and separate, and the device returns to its initial state.

[0037] When the drive mechanism fails and the part is a pipe, the clamping can be released manually: use a hex wrench to turn the threaded column 8. The threaded column 8 drives the spline sleeve 9 to move upward through the thread. The spline sleeve 9 drives the connecting plate 10 to move upward, so that the limiting block 14 separates from the limiting part 7 of the connecting part 6. Then, manually push the pressing block 5 to separate it from the part. Finally, turn the threaded column 8 in the opposite direction to reset the spline sleeve 9 and the connecting plate 10 to their initial positions.

[0038] In all the solutions mentioned above, for connections between two components, welding, bolt and nut connection, bolt or screw connection, or other known connection methods can be selected according to the actual situation. These will not be elaborated here. For all fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A fixture for milling and turning machining of a rotating body, comprising: A fixed shell (1) is detachably connected to a connecting shell (2). The connecting shell (2) has a through groove, and a guide member (3) is fixedly connected in the through groove of the connecting shell (2). The guide member (3) is slidably connected to a slider (4), and the slider (4) is detachably connected to a pressing block (5). The feature is that it further includes: There are four connectors (6), which are fixed to the lower side of the slider (4) respectively. The connectors (6) are provided with limiting parts (7). A threaded column (8) is rotatably connected to the connecting shell (2). The threaded column (8) is threadedly connected to a spline sleeve (9). The spline sleeve (9) is spline-connected to a connecting plate (10). A fixing rod (11) is fixedly connected to the inner top of the connecting shell (2). The fixing rod (11) passes through the connecting plate (10). A spring (12) is fixedly connected between the fixing rod (11) and the connecting plate (10). A limiting component is disposed on the connecting plate (10), and the limiting component limits the limiting part (7) of the connecting member (6); A driving mechanism is provided on the fixed shell (1), and the driving mechanism is used to drive the slider (4) to slide along the guide (3).

2. The fixture for combined turning and milling machining of a rotary body according to claim 1, characterized in that, The lower part of the spline sleeve (9) is provided with an annular protrusion, and the annular protrusion of the spline sleeve (9) limits the connection plate (10).

3. A fixture for milling and turning of a rotating body according to claim 1, characterized in that, The limiting component includes a support block (13), and four support blocks (13) are provided. The four support blocks (13) are fixed to the connecting plate (10) at equal intervals in the circumference. The support blocks (13) are slidably connected to a limiting block (14), and the limiting block (14) limits the limiting part (7) of the connecting member (6).

4. A fixture for milling and turning of a rotating body according to claim 3, characterized in that, The support block (13) has a through groove, and a support plate (15) is slidably connected in the through groove of the support block (13). The support plate (15) is fixedly connected to the limiting block (14). A sliding rod (16) is fixedly connected to the support plate (15). The sliding rod (16) passes through the support block (13). A spring (17) is fixedly connected between the support block (13) and the support plate (15).

5. A fixture for combined turning and milling machining of a rotary body according to claim 4, characterized in that, The limiting block (14) is wedge-shaped, and the limiting part (7) of the connector (6) is inclined on the side near the connecting plate (10).

6. A fixture for milling and turning of a rotating body according to claim 1, characterized in that, The driving mechanism includes a bottom cover (18), which is detachably fixed to the lower side of the fixed shell (1). A sealing disc (19) is fixed inside the fixed shell (1). A piston rod (20) is slidably connected between the sealing disc (19) and the bottom cover (18). The piston rod (20) is dynamically sealed to the sealing disc (19) and the bottom cover (18). A piston disc (201) is fixed to the piston rod (20), and the piston disc (201) is dynamically sealed to the inner wall of the fixed shell (1).

7. A fixture for combined turning and milling machining of a rotary body according to claim 6, characterized in that, The piston rod (20) has two stepped surfaces, and a connecting ring (21) is slidably connected between the two stepped surfaces of the piston rod (20). A hinge (22) is hinged between the connecting ring (21) and the connecting member (6).

8. A fixture for milling and turning of a rotating body according to claim 6, characterized in that, A connecting frame (23) is fixedly connected to the lower side of the connecting plate (10), and a push rod (24) is fixedly connected between the connecting frame (23) and the piston rod (20), and the push rod (24) abuts against the connecting frame (23).

9. A fixture for milling and turning of a rotating body according to claim 8, characterized in that, The fixed shell (1) is fixedly connected to and connected to two air nozzles (25), and the connection points between the two air nozzles (25) and the fixed shell (1) are located on the upper and lower sides of the piston disc (201), respectively.

10. A fixture for combined turning and milling machining of a rotary body according to claim 9, characterized in that, A magnetic ring one (26) is fixedly connected to the lower side of the connecting ring (21), and a magnetic ring two (27) is fixedly connected to the upper side of the sealing disc (19). The magnetic ring one (26) and the magnetic ring two (27) are magnetically connected.

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