A spindle for a dehydrator

Abstract

This utility model discloses a spindle for a dewatering machine, belonging to the technical field of dewatering machines. Its key technical features include a shaft body with a first cavity and a second cavity arranged vertically inside. A vertically arranged drive rod is rotatably connected within the first cavity. The drive rod consists of several bidirectional lead screws, each coaxially connected via a coupling. Each bidirectional lead screw is equipped with a locking component. A drive unit for driving the drive rod to rotate is located within the second cavity. The shaft body is fitted with mounting rings, the number of which matches the number of locking components. This utility model, by employing a detachable mounting ring connection structure with the blade assembly, solves the problem of requiring complete replacement of damaged blades in traditional fully welded spindles. It enables individual disassembly and replacement of damaged components, effectively reducing maintenance costs and significantly shortening equipment downtime, thus improving maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of dehydrator technology, specifically a dehydrator spindle. Background Technology

[0002] Plastic dewatering machines are automatic feeding and dewatering devices for plastics after crushing and washing. They are primarily used as the final stage after cyclic coarse washing, crushing, washing, and rinsing, replacing manual handling and adding an extra level of washing and automatic high-speed dewatering. The dewatering rate can reach 90%, significantly saving labor, improving washing quality, and reducing energy consumption. They can also be integrated with automatic conveying devices to form a higher level of automated production line. The plastic dewatering machine utilizes a spiral, upward pushing, and separation dewatering mechanism, automatically feeding and discharging material in one pass, handling over 1 ton of sheet material. Its unique automatic feeding and discharging function overcomes the shortcomings of traditional centrifuges that require manual feeding and discharging, offering convenience, speed, and significant labor savings and improved work efficiency.

[0003] However, in practical applications, most traditional dewatering machines on the market use a thin-walled, fully welded, closely spaced blade structure for their main shaft, with the blades and main shaft being fixedly connected and non-removable. This integrated structure means that when a local blade is damaged, worn, or requires maintenance, the damaged part cannot be replaced individually; the entire main shaft must be replaced. This not only increases maintenance costs but also extends equipment downtime. Furthermore, the fully welded main shaft needs to be integrally welded during manufacturing. If it is necessary to adjust the blade angle, spacing, or replace blades of different specifications to adapt to different materials (such as large particles or flakes), disassembly and adjustment are almost impossible. A new main shaft must be custom-made, resulting in extremely poor flexibility. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a dewatering machine spindle. This technical solution solves the problem mentioned in the background section that traditional dewatering machines on the market often use a thin-walled, fully welded, closely spaced blade structure for their spindles, with the blades and spindle fixedly connected in a non-detachable manner. This integrated structure means that when local blades are damaged, worn, or require maintenance, the damaged parts cannot be replaced individually; the entire spindle must be replaced. This not only increases maintenance costs but also prolongs equipment downtime. Furthermore, the fully welded spindle requires integral welding during manufacturing. If adjustments to blade angles, spacing, or replacement with different blade specifications to suit different materials (such as large particles or flakes) are needed later, disassembly and adjustment are almost impossible, requiring the customization of a new spindle, resulting in extremely poor flexibility.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A dewatering machine spindle includes a shaft body. The shaft body has a first cavity and a second cavity arranged vertically inside. A vertically arranged drive rod is rotatably connected to the first cavity. The drive rod is composed of several bidirectional lead screws, each of which is equipped with a locking component. A drive unit for driving the drive rod to rotate is provided in the second cavity. The shaft body is fitted with mounting rings of the same number as the locking components. The inner ring of each mounting ring has a locking groove that mates with the locking components. The outer ring of each mounting ring is fixedly connected to several mounting blocks arranged in a circular array. A connecting plate is detachably connected to the side of each mounting block away from the mounting ring. Several receiving plates are arranged vertically and parallel to each other on the side of the connecting plate away from the mounting blocks.

[0007] Preferably, the locking assembly includes two movable seats that are threadedly connected to a bidirectional lead screw and distributed vertically. Push rods are hinged to both sides of the movable seats. A push plate is hinged to one end of two push rods located on the same side of the two movable seats. A locking insert that matches the locking groove is fixedly connected to the side of the push plate away from the push rod. A through groove is provided on the shaft for the locking insert to move laterally.

[0008] Preferably, the drive unit includes a first bevel gear, the bottom end of the drive rod extends into the second cavity and is fixedly connected to the first bevel gear, a horizontally arranged rotating rod and a worm are rotatably connected in the second cavity, the rotating rod and the worm are perpendicular to each other, a second bevel gear that meshes with the first bevel gear is fixedly connected to the rotating rod, a worm wheel that meshes with the worm is also fixedly connected to the rotating rod, one end of the worm extends to the outside of the shaft and is fixedly connected to a rotating block, and a slot is provided on the outer side of the rotating block to facilitate rotation with a tool.

[0009] Preferably, the receiving plate is made of high-chromium cast iron, and the shaft body is made of 40CrNiMoA high-strength alloy steel, which is subjected to overall quenching and tempering and journal surface hardening.

[0010] Preferably, the inner ring of the mounting ring has a guide groove, and a guide block that cooperates with the guide groove is fixedly connected to the outer side of the shaft. Through the cooperation of the guide groove and the guide block, when the mounting ring is sleeved on the shaft, the locking groove in the mounting ring is easy to align with the locking component. The inner ring of the mounting ring also has a groove for the rotating block to pass through, and the groove extends along the axial direction of the shaft.

[0011] Preferably, the top of the mounting block is provided with a T-shaped slot, a T-shaped insert is movably inserted into the T-shaped slot, the T-shaped insert is fixedly connected to the connecting plate, and a horizontally arranged fixing bolt passes through the T-shaped insert and the mounting block. The connecting plate is detachably connected to the mounting block through the cooperation of the T-shaped slot, the T-shaped insert and the fixing bolt.

[0012] Preferably, a limiting ring is fixedly connected to the outer side of the shaft near the top. When the mounting ring is sleeved on the shaft and slides to fit against the limiting ring, the locking groove in the mounting ring will align with the uppermost locking component. When the top of the connecting plate of the subsequent mounting ring sleeved on the shaft fits against the bottom of the connecting plate of the upper mounting ring, the locking groove in the subsequent mounting ring can align with the corresponding locking component.

[0013] Preferably, a sealing ring adapted to the locking block is fixedly connected in the through groove, and the sealing ring and the locking block are gap-sealed, with a fitting gap of no more than 0.05mm.

[0014] Compared with the prior art, the present invention provides a spindle for a dehydrator, which has the following advantages:

[0015] 1. This utility model solves the problem of needing to replace the entire spindle when some blades are damaged in a traditional fully welded spindle by adopting a detachable mounting ring and blade assembly connection structure. It realizes the individual disassembly and replacement of damaged parts, effectively reduces maintenance costs, and significantly shortens equipment downtime and improves maintenance efficiency.

[0016] 2. Compared with the limitations of traditional all-welded structures that cannot adjust blade parameters, this utility model, with the cooperation of locking components, T-shaped slots and inserts, can flexibly adjust blades of different specifications to meet the dewatering needs of various materials such as large particles and flakes, greatly improving the flexibility and applicability of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a sectional view of the central shaft of this utility model;

[0019] Figure 3 In this utility model Figure 2 A magnified structural diagram at point A;

[0020] Figure 4 This is a cross-sectional view of the central axis of this utility model from another perspective;

[0021] Figure 5 In this utility model Figure 4 A magnified structural diagram at point B;

[0022] Figure 6 This is a schematic diagram of the external structure of the central shaft of this utility model;

[0023] Figure 7 This is a schematic diagram of the mounting ring in this utility model.

[0024] The following are the labels in the diagram: 1. Shaft; 2. First cavity; 3. Second cavity; 4. Drive rod; 5. Two-way lead screw; 6. Locking assembly; 601. Moving seat; 602. Push rod; 603. Push plate; 604. Locking insert; 605. Through slot; 7. Drive unit; 701. First bevel gear; 702. Rotating rod; 703. Second bevel gear; 704. Worm gear; 705. Worm; 706. Rotating block; 8. Mounting ring; 9. Locking groove; 10. Mounting block; 11. Connecting plate; 12. Feeding plate; 13. Guide groove; 14. Guide block; 15. Groove; 16. T-slot; 17. T-block; 18. Fixing bolt; 19. Limiting ring; 20. Sealing ring. Detailed Implementation

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0026] Example 1

[0027] Please refer to Figures 1 to 7 As shown, a dewatering machine main shaft includes a shaft body 1. The shaft body 1 has a first cavity 2 and a second cavity 3 arranged vertically. A vertically arranged drive rod 4 is rotatably connected in the first cavity 2. The drive rod 4 is composed of several bidirectional lead screws 5. Each bidirectional lead screw 5 is coaxially connected by a coupling. Each bidirectional lead screw 5 is provided with a locking component 6. A drive unit 7 for driving the drive rod 4 to rotate is provided in the second cavity 3. The shaft body 1 is fitted with mounting rings 8 in the same number as the locking components 6. The inner ring of the mounting ring 8 has a locking groove 9 that cooperates with the locking components 6. The outer ring of the mounting ring 8 is fixedly connected with several mounting blocks 10 arranged in a ring array. A connecting plate 11 is detachably connected to the side of the mounting block 10 away from the mounting ring 8. Several receiving plates 12 are arranged vertically and parallel to each other on the side of the connecting plate 11 away from the mounting block 10.

[0028] Those skilled in the art will understand that the shaft body 1 is fitted with mounting rings 8 in the same number as the locking components 6, and the mounting rings 8 are fixed to the locking components 6 through the inner ring locking grooves 9; the mounting blocks 10 on the outer ring of the mounting rings 8 are fitted with the receiving plates 12 through the detachably connected connecting plates 11, and the receiving plates 12 are distributed in parallel vertically.

[0029] The drive unit 7 and the locking component 6 work together to quickly lock and unlock the mounting ring 8. Combined with the detachable structure of the mounting block 10 and the connecting plate 11, the problem of disassembly and assembly of the traditional fully welded spindle is solved, providing a basis for subsequent maintenance and component replacement.

[0030] Example 2

[0031] Furthermore, the locking assembly 6 includes two movable seats 601 that are threadedly connected to the bidirectional lead screw 5 and distributed vertically. Push rods 602 are hinged to both sides of the movable seats 601. One end of the two push rods 602 located on the same side of the upper and lower movable seats 601 is hinged to a push plate 603. A locking insert 604 that is adapted to the locking groove 9 is fixedly connected to the side of the push plate 603 away from the push rod 602. A through groove 605 is provided on the shaft 1 for the locking insert 604 to move laterally.

[0032] As will be understood by those skilled in the art, in the locking assembly 6, when the bidirectional lead screw 5 rotates, the two vertically distributed movable seats 601 move relative to each other along the lead screw, driving the push rods 602 hinged on both sides to push the push plate 603 to move laterally, so that the locking insert 604 on the push plate 603 is inserted into the locking groove 9 of the mounting ring 8 through the through groove 605 of the shaft 1, thereby fixing the mounting ring 8 to the shaft 1; when the bidirectional lead screw 5 is rotated in the opposite direction, the locking insert 604 disengages from the locking groove 9, completing the unlocking.

[0033] By utilizing the linkage between the bidirectional lead screw 5 and the connecting rod structure, the locking plug 604 can be automatically extended and retracted without manual operation, thus improving the efficiency of the installation ring 8. The through slot 605 provides space for the locking plug 604 to move, ensuring a stable and smooth locking and unlocking process.

[0034] Example 3

[0035] Furthermore, the drive unit 7 includes a first bevel gear 701, the bottom end of the drive rod 4 extends into the second cavity 3 and is fixedly connected to the first bevel gear 701, a horizontally arranged rotating rod 702 and a worm gear 705 are rotatably connected in the second cavity 3, the rotating rod 702 and the worm gear 705 are perpendicular to each other, a second bevel gear 703 that meshes with the first bevel gear 701 is fixedly connected to the rotating rod 702, a worm wheel 704 that meshes with the worm gear 705 is also fixedly connected to the rotating rod 702, one end of the worm gear 705 extends to the outside of the shaft 1 and is fixedly connected to a rotating block 706, and a slot is provided on the outer side of the rotating block 706 to facilitate rotation with tools.

[0036] As will be understood by those skilled in the art, in the drive unit 7, the rotating block 706 outside the rotating shaft 1 drives the worm 705 to rotate, the worm 705 meshes with the worm wheel 704 on the rotating rod 702, driving the rotating rod 702 to rotate; the second bevel gear 703 on the rotating rod 702 meshes with the first bevel gear 701 at the bottom of the drive rod 4, ultimately driving the drive rod 4 to rotate, thereby realizing the power transmission of the locking assembly 6.

[0037] The combination of worm gear 705, worm wheel 704 and bevel gear is used to convert horizontal rotation into vertical rotation of drive rod 4. At the same time, the self-locking characteristics of worm gear and worm wheel are used to prevent drive rod 4 from reversing due to load, thus improving structural safety. The slotted design of rotating block 706 facilitates tool operation and reduces the control difficulty of drive unit 7.

[0038] Example 4

[0039] Furthermore, the receiving plate 12 is made of high-chromium cast iron, and the shaft body 1 is made of 40CrNiMoA high-strength alloy steel, which is tempered and the journal surface is hardened.

[0040] Those skilled in the art will understand that the receiving plate 12 is made of high-chromium cast iron, which utilizes its high wear resistance to adapt to material impact; the shaft body 1 is made of 40CrNiMoA high-strength alloy steel, which is subjected to overall quenching and tempering and journal surface hardening treatment to improve overall strength and journal wear resistance, ensuring stable operation of the spindle during high-speed dehydration.

[0041] The targeted material selection and heat treatment process extended the service life of the feed plate 12 and the shaft 1, solved the problem of easy wear and deformation caused by insufficient material strength of traditional spindles, and improved the durability of the equipment.

[0042] Example 5

[0043] Furthermore, the inner ring of the mounting ring 8 is provided with a guide groove 13, and a guide block 14 that cooperates with the guide groove 13 is fixedly connected to the outer side of the shaft body 1. Through the cooperation of the guide groove 13 and the guide block 14, when the mounting ring 8 is sleeved on the shaft body 1, the locking groove 9 in the mounting ring 8 is easy to align with the locking component 6. The inner ring of the mounting ring 8 is also provided with a groove 15 for the rotating block 706 to pass through, and the groove 15 extends along the axial direction of the shaft body 1.

[0044] Those skilled in the art will understand that the guide groove 13 of the inner ring of the mounting ring 8 cooperates with the guide block 14 on the outer side of the shaft 1 to ensure that the locking groove 9 and the locking component 6 are precisely aligned when the mounting ring 8 is fitted; the groove 15 of the inner ring of the mounting ring 8 extends axially along the shaft 1 to provide clearance space for the rotating block 706 and avoid interference between the mounting ring 8 and the rotating block 706 during installation.

[0045] The cooperation between the guide groove 13 and the guide block 14 improves the assembly accuracy of the mounting ring 8, and the design of the groove 15 eliminates the spatial obstruction of the rotating block 706 on the mounting ring 8, further optimizing the disassembly and assembly process.

[0046] Example 6

[0047] Furthermore, a T-shaped slot 16 is provided on the top of the mounting block 10, and a T-shaped insert 17 is movably inserted into the T-shaped slot 16. The T-shaped insert 17 is fixedly connected to the connecting plate 11, and a horizontally arranged fixing bolt 18 passes between the T-shaped insert 17 and the mounting block 10. The connecting plate 11 is detachably connected to the mounting block 10 through the cooperation of the T-shaped slot 16, the T-shaped insert 17 and the fixing bolt 18.

[0048] Those skilled in the art will understand that after the T-shaped slot 16 on the top of the mounting block 10 engages with the T-shaped insert 17 on the connecting plate 11 to achieve initial positioning, the T-shaped insert 17 is fastened to the mounting block 10 by the horizontally set fixing bolts 18, thus completing the detachable connection between the connecting plate 11 and the mounting block 10.

[0049] The T-shaped plug structure serves both positioning and load-bearing functions. Combined with the secondary tightening of the fixing bolts 18, it ensures a stable connection between the connecting plate 11 and the mounting block 10. The detachable design makes it easier to replace the material receiving plate 12 individually, reducing maintenance costs.

[0050] Example 7

[0051] Furthermore, a limiting ring 19 is fixedly connected to the outer side of the shaft 1 near the top. When the mounting ring 8 is sleeved on the shaft 1 and slides to fit against the limiting ring 19, the locking groove 9 in the mounting ring 8 will align with the uppermost locking component 6. When the top of the connecting plate 11 installed on the outer side of the subsequent mounting ring 8 fits against the bottom of the connecting plate 11 installed on the outer side of the upper mounting ring 8, the locking groove 9 in the subsequent mounting ring 8 can align with the corresponding locking component 6.

[0052] Those skilled in the art will understand that the limiting ring 19 outside the shaft 1 axially positions the first mounting ring 8 so that its locking groove 9 is aligned with the uppermost locking component 6; subsequent mounting rings 8 are positioned by the upper and lower fitting of the external connecting plate 11, ensuring that the locking groove 9 of each mounting ring 8 is precisely matched with the corresponding locking component 6.

[0053] By fitting and positioning the limiting ring 19 with the connecting plate 11, the alignment problem when multiple mounting rings 8 are stacked is solved, ensuring the coaxiality of the overall structure and avoiding equipment vibration or component wear caused by installation deviation.

[0054] Example 8

[0055] Furthermore, a sealing ring 20 adapted to the locking plug 604 is fixedly connected inside the through groove 605. The sealing ring 20 and the locking plug 604 are gap-sealed, and the fitting gap is no more than 0.05mm.

[0056] Those skilled in the art will understand that a sealing ring 20 adapted to the locking block 604 is fixed in the through groove 605 of the shaft 1. The sealing ring 20 and the locking block 604 are sealed with a gap of no more than 0.05mm, which prevents external impurities from entering the shaft 1 and does not affect the lateral movement of the locking block 604.

[0057] The gap seal design balances sealing performance with movement flexibility, avoids the locking block 604 jamming problem caused by the traditional seal ring being too tight, and protects the internal cavity of the shaft 1 from contamination, extending the service life of the drive unit 7 and the locking assembly 6.

[0058] The working principle and usage procedure of this device are as follows: First, the mounting ring 8 is fitted onto the shaft 1 via the guide groove 13 of the inner ring and the guide block 14 on the outer side of the shaft 1. This allows the first mounting ring 8 to slide until it engages with the limiting ring 19 on the outside of the shaft 1. Subsequent mounting rings 8 are positioned by the upper and lower engagement of the external connecting plate 11, ensuring that the locking groove 9 within each mounting ring 8 aligns with the corresponding locking component 6. Next, a tool is used to rotate the rotating block 706 on the outside of the shaft 1, causing the worm gear 705 to rotate. The worm gear 705 meshes with the worm wheel 704 on the rotating rod 702, causing the rotating rod 702 to rotate. The second bevel gear 703 on the rotating rod 702 meshes with the first bevel gear 701 at the bottom of the drive rod 4, driving the... The drive rod 4, which is connected by a coupling, rotates through the double-acting screw 5. The double-acting screw 5 drives the upper and lower moving seats 601 to move relative to each other, pushing the push rod 602 and the push plate 603 so that the locking block 604 is inserted into the locking groove 9 through the through groove 605, thus fixing the mounting ring 8. Then, the connecting plate 11 is engaged with the T-shaped slot 16 of the mounting block 10 through the T-shaped plug 17 and tightened by the fixing bolt 18 to realize the installation of the receiving plate 12. During maintenance, the rotating block 706 is rotated in the opposite direction to disengage the locking block 604 from the locking groove 9. The fixing bolt 18 can be removed to take off the connecting plate 11 and the receiving plate 12. The gap between the sealing ring 20 in the through groove 605 and the locking block 604 can prevent impurities from entering the shaft 1.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dehydration machine spindle comprising a shaft body (1), characterized in that, The shaft (1) has a first cavity (2) and a second cavity (3) arranged vertically inside. A vertically arranged drive rod (4) is rotatably connected inside the first cavity (2). The drive rod (4) is composed of several bidirectional lead screws (5). Each bidirectional lead screw (5) is provided with a locking component (6). A drive unit (7) for driving the drive rod (4) to rotate is provided inside the second cavity (3). The shaft (1) is fitted with a number of mounting rings (8) that are the same as the number of locking components (6). The inner ring of the mounting ring (8) is provided with a locking groove (9) that cooperates with the locking component (6). The outer ring of the mounting ring (8) is fixedly connected with several mounting blocks (10) arranged in a ring array. A connecting plate (11) is detachably connected to the side of the mounting block (10) away from the mounting ring (8). Several receiving plates (12) are arranged vertically and parallel to each other on the side of the connecting plate (11) away from the mounting block (10).

2. A main shaft for a spin dryer according to claim 1, characterised in that The locking assembly (6) includes two movable seats (601) that are threaded onto a bidirectional lead screw (5) and distributed vertically. Push rods (602) are hinged to both sides of the movable seats (601). A push plate (603) is hinged to one end of the two push rods (602) located on the same side of the upper and lower movable seats (601). A locking block (604) that is adapted to the locking groove (9) is fixedly connected to the side of the push plate (603) away from the push rod (602). A through groove (605) for the locking block (604) to move laterally is provided on the shaft (1).

3. A main shaft for a spin dryer according to claim 1, characterised in that The drive unit (7) includes a first bevel gear (701). The bottom end of the drive rod (4) extends into the second cavity (3) and is fixedly connected to the first bevel gear (701). A rotating rod (702) and a worm gear (705) are rotatably connected in the second cavity (3). The rotating rod (702) and the worm gear (705) are perpendicular to each other. A second bevel gear (703) that meshes with the first bevel gear (701) is fixedly connected to the rotating rod (702). A worm wheel (704) that meshes with the worm gear (705) is also fixedly connected to the rotating rod (702). One end of the worm gear (705) extends to the outside of the shaft (1) and is fixedly connected to a rotating block (706). A slot is provided on the outside of the rotating block (706) to facilitate rotation with tools.

4. A main shaft for a spin dryer according to claim 1, characterized in that The receiving plate (12) is made of high-chromium cast iron, and the shaft body (1) is made of 40CrNiMoA high-strength alloy steel, which is tempered and the journal surface is quenched.

5. A spin dryer main shaft according to claim 3, characterized in that The inner ring of the mounting ring (8) is provided with a guide groove (13). The outer side of the shaft (1) is fixedly connected with a guide block (14) that cooperates with the guide groove (13). Through the cooperation of the guide groove (13) and the guide block (14), when the mounting ring (8) is sleeved on the shaft (1), the locking groove (9) in the mounting ring (8) is easy to align with the locking component (6). The inner ring of the mounting ring (8) is also provided with a groove (15) for the rotating block (706) to pass through. The groove (15) extends along the axial direction of the shaft (1).

6. A spin-dryer spindle according to claim 1, wherein The top of the mounting block (10) is provided with a T-shaped slot (16), and a T-shaped plug (17) is movably inserted into the T-shaped slot (16). The T-shaped plug (17) is fixedly connected to the connecting plate (11). A horizontally arranged fixing bolt (18) passes between the T-shaped plug (17) and the mounting block (10). The connecting plate (11) is detachably connected to the mounting block (10) through the cooperation of the T-shaped slot (16), the T-shaped plug (17) and the fixing bolt (18).

7. A spin-dryer spindle according to claim 1, wherein A limiting ring (19) is fixedly connected to the outside of the shaft (1) near the top. When the mounting ring (8) is sleeved on the shaft (1) and slides to fit with the limiting ring (19), the locking groove (9) in the mounting ring (8) will be aligned with the uppermost locking component (6). When the top of the connecting plate (11) installed on the outside of the subsequent mounting ring (8) fits with the bottom of the connecting plate (11) installed on the outside of the upper mounting ring (8), the locking groove (9) in the subsequent mounting ring (8) can be aligned with the corresponding locking component (6).

8. A spin-dryer spindle according to claim 2, wherein A sealing ring (20) adapted to the locking plug (604) is fixedly connected in the through groove (605). The sealing ring (20) and the locking plug (604) are sealed with a gap, and the gap is no more than 0.05mm.

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