Stable dynamic seal axial sliding structure

Abstract

The invention relates to the technical field of axial sliding structures, and discloses a stable dynamic seal axial sliding structure which comprises a pipe body, and an air guide assembly for guiding air leaked when a movable rod contracts is arranged on the circumferential inner wall of the pipe body. A liquid guiding assembly for guiding leaked media due to extension of the movable rod is arranged on the circumferential inner wall of the pipe body, the air guiding assembly is located above the liquid guiding assembly, an upper sealing cover and a lower sealing cover which are used for fixing the pipe body to the position needing to be sealed are arranged at the upper end and the lower end of the pipe body correspondingly, and the upper sealing cover and the lower sealing cover are in threaded connection with the pipe body. The outer wall of the circumference of the upper sealing cover is provided with a sealing assembly for preventing dust of the extending-out part of the movable rod, by arranging the sealing assembly, the extending-out movable rod can be completely isolated from the external environment, then dust particles in the external environment cannot make contact with the surface of the sliding movable rod, and the cleanliness of the movable rod in the moving process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of axial sliding structures, in particular to a stable dynamic sealing axial sliding structure. Background Art

[0002] Dynamic seals refer to the seals between relatively moving parts in machines or equipment. They are mainly divided into two categories: reciprocating dynamic seals and rotary dynamic seals. Among them, reciprocating dynamic seals are divided into three categories: molded packing seals, stuffing box seals and expansion ring seals.

[0003] After searching, a Chinese patent with publication number CN218468241U discloses a differential pressure reciprocating sliding sealing box, which can be used for sealing a variety of equipment with pressurized solid-liquid two-phase fluid media inside. It can ensure that the working medium does not leak and that the equipment push rod and other components will not be worn, corroded, contaminated and fail due to leakage of the working medium. However, after long-term use, the seal ages and the medium is very easy to leak from the seal. In addition, its movable rod is in contact with the external environment, which makes it easy for dust particles to be adsorbed on the movable rod, further increasing the wear between the movable rod and the seal. Summary of the Invention

[0004] Technical problems solved In response to the shortcomings of the existing technology, the present invention provides a stable dynamic seal axial sliding structure, which is mainly used to solve the problem that after long-term use, the seal ages and the medium is very easy to leak from the seal. In addition, its movable rod is in contact with the external environment, which makes it easy for dust particles to be adsorbed on the movable rod, further increasing the wear between the movable rod and the seal.

[0005] Technical Solution To achieve the above object, the present invention provides the following technical solutions: The circumferential inner wall of the tube body is provided with an air guide component for guiding the air leaked when the movable rod is contracted, the circumferential inner wall of the tube body is provided with a liquid guide component for guiding the leaked medium when the movable rod is extended, and the air guide component is located above the liquid guide component, the upper and lower ends of the tube body are provided with an upper sealing cover and a lower sealing cover for fixing the tube body at the required sealing position, and the upper and lower sealing covers are threadedly connected to the tube body, the circumferential outer wall of the upper sealing cover is provided with a sealing component for dust-proofing the protruding part of the movable rod, a placement groove is formed between the upper and lower sealing covers and the tube body, a sealing ring is placed in the placement groove, a secondary sealing component is provided between the upper and lower sealing covers and the tube body to seal the connection between them, and rubber pads are bonded to the top inner wall of the upper sealing cover and the bottom inner wall of the lower sealing cover.

[0006] Furthermore, the air guide assembly includes a first scraper groove, which is opened on the circumferential inner wall of the tube body. A first through hole is opened on the inner wall of one side of the first scraper groove, and the other end of the first through hole is connected to the placement groove formed between the upper cover and the tube body. The top of the first scraper groove is a first inclined surface.

[0007] Based on the above-mentioned scheme, the liquid guiding component includes a second scraper groove, which is opened on the circumferential inner wall of the tube body. A second through hole is opened on the inner wall of one side of the second scraper groove, and the other end of the second through hole is connected to the placement groove formed between the lower cover and the tube body. The lower end of the second scraper groove is a second inclined surface.

[0008] As a further solution of the present invention, the closing component includes a lower groove, which is opened on the top outer wall of the upper cover. A rotating disk is rotatably connected in the lower groove, and the position of the rotating disk is limited by a limiting component. A dust cover is provided on the outer side of the circumference of the rotating disk. The dust cover is corrugated. The dust cover is connected to the rotating disk by a first fixing component. A connecting ring is provided on the top of the dust cover, and the connecting ring is fixed to the movable rod by a locking mechanism. The connecting ring and the dust cover are connected by a second fixing component.

[0009] Furthermore, the limiting assembly includes at least two threaded rods, which are welded to the top outer wall of the upper cover, and the circumferential outer wall of the threaded rod is sleeved with a pressure cover, and the top end of the threaded rod is threadedly connected to a nut, and the nut is in contact with the pressure cover, and a rotation groove is provided on the lower surface of the pressure cover, and the rotation groove and the lower groove are combined to form a cross-shaped ring groove, and the rotating disk rotates in the cross-shaped ring groove, and a second tooth groove is provided on the lower surface of the pressure cover, and a first tooth groove is provided on the top outer wall of the upper cover, and the second tooth groove can be inserted into the first tooth groove.

[0010] Based on the above scheme, the first fixing component includes a first fixing groove, which is opened on the circumferential outer wall of the rotating disk. A first steel wire is provided in the first fixing groove, and the bottom end of the dust cover is tied in the first fixing groove by the first steel wire.

[0011] As a further solution of the present invention, the second fixing assembly includes a second fixing groove, which is opened on the circumferential outer wall of the connecting ring. A second steel wire is provided in the second fixing groove, and the other end of the dust cover is tied in the second fixing groove by the second steel wire.

[0012] Furthermore, the limiting mechanism includes a threaded hole, which is opened on the outer wall of one side of the connecting ring. A screw rod is threadedly connected to the threaded hole, and a friction plate is bonded to one end of the screw rod, and the friction plate is in contact with the movable rod.

[0013] Based on the above scheme, the secondary sealing assembly includes two slots, which are respectively opened on the upper surface and the lower surface of the tube body. A rubber ring is bonded to the inner wall of one side of the two slots, and a fixing ring is inserted into the two slots, and the two fixing rings are respectively fixed to the bottom inner wall of the lower cover and the top inner wall of the upper cover.

[0014] As a further solution of the present invention, a mounting groove is provided on the circumferential inner wall of the connecting ring, a sealing ring is bonded in the mounting groove, and the circumferential inner wall of the sealing ring is an eight-shaped ring.

[0015] Beneficial effects Compared with the prior art, the present invention provides a stable dynamic seal axial sliding structure with the following beneficial effects: 1. The present invention is capable of completely isolating the extended movable rod from the external environment by providing a sealing component, thereby preventing dust particles in the external environment from contacting the sliding surface of the movable rod, thereby improving the cleanliness of the movable rod when it moves.

[0016] 2. The present invention is provided with an air guide component, so that the leaked air will pass over the sealing ring and enter the first scraping groove, and the movement of the movable rod will provide power for the air, so that the air will enter the upper placement groove from the first through hole, thereby increasing the pressure between the upper sealing ring and the placement groove, thereby pushing the sealing ring to move toward the movable rod for sealing, thereby improving the sealing performance when the movable rod is retracted.

[0017] 3. The present invention is provided with a liquid guide component, and the leaked medium will enter the second scraping groove. The extended movable rod will drive the medium to move from the second scraping groove to the second through hole, and flow into the space between the placement groove and the sealing ring below, thereby pushing the sealing ring below to move toward the movable rod, thereby improving the sealing performance when the movable rod is extended.

[0018] 4. The present invention is provided with a secondary sealing component. When the upper cover and the lower cover are installed, the fixing ring will be inserted into the slot. After the fixing is completed, the fixing ring will contact the rubber ring to perform secondary sealing, thereby improving the sealing between the upper cover, the lower cover and the tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the front three-dimensional structure of a stable dynamic sealing axial sliding structure proposed by the present invention; Figure 2 This is a partially enlarged structural diagram of a stable dynamic seal axial sliding structure proposed by the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of a tube body of a stable dynamic sealing axial sliding structure proposed by the present invention; Figure 4 A stable dynamic seal axial sliding structure proposed by the present invention Figure 3 A schematic diagram of the enlarged structure of part A; Figure 5 A stable dynamic seal axial sliding structure proposed by the present invention Figure 3 Schematic diagram of the enlarged structure of part B; Figure 6 This is a partial cross-sectional structural diagram of a stable dynamic seal axial sliding structure proposed by the present invention; Figure 7 A stable dynamic seal axial sliding structure proposed by the present invention Figure 6 Schematic diagram of the enlarged structure of part C; Figure 8 This is a schematic cross-sectional view of the connecting ring of a stable dynamic sealing axial sliding structure proposed by the present invention.

[0020] In the figure: 1. tube body; 2. lower cover; 3. rubber pad; 4. first steel wire; 5. dust cover; 6. second steel wire; 7. connecting ring; 8. rotating disk; 9. pressure cover; 10. first fixing groove; 11. upper cover; 12. threaded rod; 13. nut; 14. placement groove; 15. first through hole; 16. first scraping groove; 17. first inclined surface; 18. second through hole; 19. second scraping groove; 20. second inclined surface; 21. fixing ring; 22. rubber ring; 23. slot; 24. first tooth groove; 25. lower groove; 26. rotating groove; 27. second tooth groove; 28. second fixing groove; 29. ​​mounting groove; 30. sealing ring; 31. threaded hole; 32. screw rod; 33. friction plate; 34. sealing ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0023] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] Reference Figures 1-8 , a stable dynamic sealing axial sliding structure, comprising a tube body 1, an air guide component for guiding the air leaked when the movable rod is retracted is provided on the circumferential inner wall of the tube body 1, a liquid guide component for guiding the leaked medium when the movable rod is extended is provided on the circumferential inner wall of the tube body 1, and the air guide component is located above the liquid guide component, and the upper and lower ends of the tube body 1 are provided with an upper sealing cover 11 and a lower sealing cover 2 for fixing the tube body 1 at the required sealing position, and the upper sealing cover 11 and the lower sealing cover 2 are threadedly connected to the tube body 1, and the circumferential outer wall of the upper sealing cover 11 is provided with a sealing component for dustproofing the protruding part of the movable rod, a placement groove 14 is formed between the upper sealing cover 11 and the lower sealing cover 2 and the tube body 1, and a sealing ring 34 is placed in the placement groove 14, and a secondary sealing component for sealing the connection between the upper sealing cover 11 and the lower sealing cover 2 and the tube body 1 is provided, and the inner wall of the top of the upper sealing cover 11 Rubber pads 3 are bonded to the bottom inner wall of the lower cover 2. When in use, the tube body 1 is installed in the sliding hole that needs to be sealed, and the tube body 1 is fixed with the upper cover 11 and the lower cover 2. When the movable rod is extended and leaks, the leaked medium will be redirected by the liquid guide component to the lower placement groove 14 and push the sealing ring 34, so that the medium will not flow out when the movable rod is extended, thereby improving the sealing when the movable rod is extended. When the movable rod is retracted, the leaked air will be redirected by the air guide component to the upper placement groove 14, and the air will push the sealing ring 34, so that the air will not flow into the medium when the movable rod is retracted, thereby improving the sealing when the movable rod is retracted. In addition, the extended movable rod will be isolated from the external environment by the sealing component, so that dust is not easily attached to the movable rod, thereby reducing the friction loss between the movable rod and the tube body 1.

[0025] Among them, the air guide component includes a first scraper groove 16, which is opened on the circumferential inner wall of the tube body 1, and a first through hole 15 is opened on the inner wall of one side of the first scraper groove 16, and the other end of the first through hole 15 is connected to the placement groove 14 formed between the upper cover 11 and the tube body 1, and the top of the first scraper groove 16 is a first inclined surface 17. When the movable rod is retracted, the leaked air will pass over the sealing ring 34 and enter the first scraper groove 16. Since the top of the first scraper groove 16 is the first inclined surface 17, the leaked air will enter the first scraper groove 16, and the movement of the movable rod will provide power for the air, so that the air enters the placement groove 14 above from the first through hole 15, thereby increasing the pressure between the upper sealing ring 34 and the placement groove 14, thereby pushing the sealing ring 34 to move toward the movable rod for sealing, thereby improving the sealing performance when the movable rod is retracted.

[0026] Among them, the liquid guiding component includes a second scraper groove 19, which is opened on the circumferential inner wall of the tube body 1. A second through hole 18 is opened on the inner wall of one side of the second scraper groove 19, and the other end of the second through hole 18 is connected to the placement groove 14 formed between the lower cover 2 and the tube body 1. The lower end of the second scraper groove 19 is a second inclined surface 20. When the movable rod is extended, the leaked medium will enter the second scraper groove 19. The leaked medium will be driven by the extended movable rod to move from the second scraper groove 19 to the second through hole 18, and flow into the space between the placement groove 14 and the sealing ring 34 below, thereby pushing the sealing ring 34 below to move toward the movable rod, thereby improving the sealing when the movable rod is extended.

[0027] Among them, the closing component includes a lower groove 25, which is opened on the top outer wall of the upper cover 11, and a rotating disk 8 is rotatably connected in the lower groove 25, and the position of the rotating disk 8 is limited by the limit assembly. A dust cover 5 is provided on the outer circumference of the rotating disk 8, and the dust cover 5 is corrugated. The dust cover 5 is connected to the rotating disk 8 by a first fixing component, and a connecting ring 7 is provided on the top of the dust cover 5, and the connecting ring 7 is fixed to the movable rod by a locking mechanism. The connecting ring 7 and the dust cover 5 are connected by a second fixing component, and the connecting ring 7 is connected to the top of the movable rod by the locking mechanism, and then the rotating disk 8 is installed on the upper cover 11 through the limit assembly, and the first fixing assembly and the second fixing assembly are used to fix the two ends of the dust cover 5 on the rotating disk 8 and the connecting ring 7 respectively, so that the exposed part of the movable rod is completely isolated by the dust cover 5, thereby reducing the amount of dust particles attached to the movable rod.

[0028] Among them, the limiting assembly includes at least two threaded rods 12, the threaded rods 12 are welded on the top outer wall of the upper cover 11, the circumferential outer wall of the threaded rod 12 is sleeved with a pressure cover 9, the top of the threaded rod 12 is threadedly connected with a nut 13, and the nut 13 is in contact with the pressure cover 9, and a rotation groove 26 is provided on the lower surface of the pressure cover 9. The rotation groove 26 and the lower groove 25 are combined to form a cross-shaped ring groove, and the rotating disk 8 rotates in the cross-shaped ring groove. A second tooth groove 27 is provided on the lower surface of the pressure cover 9, and the top outer wall of the upper cover 11 A first tooth groove 24 is provided, and a second tooth groove 27 can be inserted into the first tooth groove 24, thereby increasing the sealing between the pressure cover 9 and the upper cover 11. During installation, first install the rotating disk 8 in the lower groove 25, and then put the pressure cover 9 on the circumferential outer side of the threaded rod 12, so that the top of the circumferential inner wall of the rotating disk 8 is inserted into the rotating groove 26, and the pressure cover 9 is fixed with the nut 13, thereby completing the installation of the rotating disk 8, so that the rotating disk 8 can rotate with the rotation of the movable rod to avoid twisting and damaging the dust cover 5.

[0029] Among them, the first fixing component includes a first fixing groove 10, which is opened on the circumferential outer wall of the rotating disk 8, and a first steel wire 4 is provided in the first fixing groove 10, and the bottom end of the dust cover 5 is tied to the first steel wire 4 in the first fixing groove 10, and the first steel wire 4 is used to tie the bottom end of the dust cover 5 and tie it in the first fixing groove 10 to fix the bottom end of the dust cover 5, and the second fixing component includes a second fixing groove 28, and the second fixing groove 28 is opened on the circumferential outer wall of the connecting ring 7, and a second steel wire 6 is provided in the second fixing groove 28, and the other end of the dust cover 5 is tied to the second steel wire 6 in the second fixing groove 28, and the second steel wire 6 is used to tie the top end of the dust cover 5 and tie it in the second fixing groove 28 to fix the top end of the dust cover 5.

[0030] Among them, the limiting mechanism includes a threaded hole 31, which is opened on the outer wall of one side of the connecting ring 7. A screw rod 32 is connected to the inner thread of the threaded hole 31, and a friction plate 33 is bonded to one end of the screw rod 32, and the friction plate 33 is in contact with the movable rod. The screw rod 32 is rotated to move the screw rod 32 in the threaded hole 31, so that the friction plate 33 on one side of the screw rod 32 is in contact with the movable rod, thereby fixing the movable rod and the connecting ring 7.

[0031] Among them, the secondary sealing component includes two slots 23, and the two slots 23 are respectively opened on the upper surface and the lower surface of the tube body 1. A rubber ring 22 is bonded to the inner wall of one side of the two slots 23, and a fixing ring 21 is inserted into the two slots 23. The two fixing rings 21 are respectively fixed to the bottom inner wall of the lower cover 2 and the top inner wall of the upper cover 11. When the upper cover 11 and the lower cover 2 are installed, the fixing ring 21 will be inserted into the slot 23. After the fixation is completed, the fixing ring 21 will contact the rubber ring 22 for secondary sealing, thereby improving the sealing between the upper cover 11 and the lower cover 2 and the tube body 1.

[0032] Among them, the circumferential inner wall of the connecting ring 7 is provided with an installation groove 29, and a sealing ring 30 is bonded in the installation groove 29. The circumferential inner wall of the sealing ring 30 is an eight-shaped ring, which seals the movable rod and the connecting ring 7 to prevent dust from entering the dust cover 5 from the gap between the connecting ring 7 and the movable rod.

[0033] The working principle of the present invention is as follows: when in use, the tube body 1 is installed in the sliding hole that needs to be sealed, and the upper sealing cover 11 and the lower sealing cover 2 are used to fix the tube body 1, and the movable rod passes through the tube body 1, and then the rotating disk 8 is installed in the lower groove 25, and then the pressure cover 9 is put on the circumferential outside of the threaded rod 12, so that the top of the inner wall of the circumference of the rotating disk 8 is inserted into the rotating groove 26, and the pressure cover 9 is fixed with the nut 13, thereby completing the installation of the rotating disk 8, and installing the connecting ring 7 on the top of the movable rod, and using the first fixing component and the second fixing component to install the dust cover 5 on the rotating disk 8 and the connecting ring 7, so that the exposed part of the movable rod is completely isolated by the dust cover 5. When the movable rod is extended, the leaked medium will enter the second scraping groove 19, and the leaked medium will be deeply The movable rod drives the air to move from the second scraping groove 19 to the second through hole 18, and flows into the space between the placement groove 14 below and the sealing ring 34, thereby pushing the sealing ring 34 below to move toward the movable rod to seal the medium. When the movable rod contracts, the leaked air will pass over the sealing ring 34 and enter the first scraping groove 16. Since the top of the first scraping groove 16 is the first inclined surface 17, the leaked air will enter the first scraping groove 16, and the movement of the movable rod will provide power for the air, so that the air enters the upper placement groove 14 from the first through hole 15, thereby increasing the pressure between the upper sealing ring 34 and the placement groove 14, thereby pushing the sealing ring 34 to move toward the movable rod for sealing, thereby sealing the air and improving the stability of the sliding sealing structure.

[0034] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A stable dynamic sealing axial sliding structure, comprising a tube body (1), characterized in that: An air guide assembly is provided on the inner circumference wall of the tube body (1) for guiding the air leaked when the movable rod is retracted, and a liquid guide assembly is provided on the inner circumference wall of the tube body (1) for guiding the medium leaked when the movable rod is extended, and the air guide assembly is located above the liquid guide assembly. An upper cover (11) and a lower cover (2) are provided at both the upper and lower ends of the tube body (1) for fixing the tube body (1) at the required sealing position, and the upper cover (11) and the lower cover (2) are threadedly connected to the tube body (1). The upper cover (11) and the lower cover (2) are threadedly connected to the tube body (1). The outer circumferential wall of the cover (11) is provided with a sealing component for dustproofing the extended portion of the movable rod, a placement groove (14) is formed between the upper cover (11) and the lower cover (2) and the tube body (1), a sealing ring (34) is placed in the placement groove (14), and a secondary sealing component is provided between the upper cover (11) and the lower cover (2) and the tube body (1) to seal the connection therebetween, and a rubber pad (3) is fixedly connected to the top inner wall of the upper cover (11) and the bottom inner wall of the lower cover (2).

2. A stable dynamic seal axial sliding structure according to claim 1, characterized in that: The air guide assembly includes a first scraper groove (16), which is provided on the inner circumferential wall of the tube body (1). A first through hole (15) is provided on the inner wall of one side of the first scraper groove (16), and the other end of the first through hole (15) is connected to the placement groove (14) formed between the upper cover (11) and the tube body (1). The top end of the first scraper groove (16) is a first inclined surface (17).

3. The stable dynamic seal axial sliding structure according to claim 1, characterized in that: The liquid guiding assembly includes a second scraping groove (19), which is provided on the inner circumferential wall of the tube body (1). A second through hole (18) is provided on the inner wall of one side of the second scraping groove (19), and the other end of the second through hole (18) is connected to the placement groove (14) formed between the lower cover (2) and the tube body (1). The lower end of the second scraping groove (19) is a second inclined surface (20).

4. The stable dynamic seal axial sliding structure according to claim 1, characterized in that: The closure assembly comprises a lower groove (25), the lower groove (25) being opened on the top outer wall of the upper cover (11), a rotating disk (8) being rotatably connected in the lower groove (25), and the position of the rotating disk (8) being limited by a limiting assembly, a dust cover (5) being provided on the circumferential outer side of the rotating disk (8), the dust cover (5) being in a corrugated shape, the dust cover (5) and the rotating disk (8) being connected via a first fixing assembly, a connecting ring (7) being provided on the top of the dust cover (5), and the connecting ring (7) being fixed to the movable rod via a locking mechanism, and the connecting ring (7) and the dust cover (5) being connected via a second fixing assembly.

5. The stable dynamic sealing axial sliding structure according to claim 4, characterized in that: The limiting assembly includes at least two threaded rods (12), the threaded rods (12) are fixedly connected to the top outer wall of the upper cover (11), the circumferential outer wall of the threaded rod (12) is sleeved with a pressure cover (9), the top end of the threaded rod (12) is threadedly connected with a nut (13), and the nut (13) is in contact with the pressure cover (9), the lower surface of the pressure cover (9) is provided with a rotation groove (26), the rotation groove (26) and the lower groove (25) are combined to form a cross-shaped ring groove, and the rotating disk (8) rotates in the cross-shaped ring groove, the lower surface of the pressure cover (9) is provided with a second tooth groove (27), the top outer wall of the upper cover (11) is provided with a first tooth groove (24), and the second tooth groove (27) can be inserted into the first tooth groove (24).

6. The stable dynamic seal axial sliding structure according to claim 4, characterized in that: The first fixing assembly comprises a first fixing groove (10), the first fixing groove (10) being formed on the circumferential outer wall of the rotating disk (8), a first steel wire (4) being provided in the first fixing groove (10), and the bottom end of the dust cover (5) being bound by the first steel wire (4) in the first fixing groove (10).

7. The stable dynamic seal axial sliding structure according to claim 4, characterized in that: The second fixing assembly comprises a second fixing groove (28), the second fixing groove (28) being formed on the circumferential outer wall of the connecting ring (7), a second steel wire (6) being provided in the second fixing groove (28), and the other end of the dust cover (5) being bound in the second fixing groove (28) by the second steel wire (6).

8. The stable dynamic seal axial sliding structure according to claim 4, characterized in that: The limiting mechanism comprises a threaded hole (31), the threaded hole (31) being formed on an outer wall of one side of the connecting ring (7), a screw rod (32) being connected to an inner thread of the threaded hole (31), a friction plate (33) being fixedly connected to one end of the screw rod (32), and the friction plate (33) being in contact with the movable rod.

9. The stable dynamic seal axial sliding structure according to claim 1, characterized in that: The secondary sealing assembly comprises two slots (23), the two slots (23) being respectively opened on the upper surface and the lower surface of the tube body (1), the inner walls of one side of the two slots (23) being fixedly connected with a rubber ring (22), the two slots (23) being respectively inserted with a fixing ring (21), and the two fixing rings (21) being respectively fixed to the bottom inner wall of the lower cover (2) and the top inner wall of the upper cover (11).

10. The stable dynamic seal axial sliding structure according to claim 4, characterized in that: The circumferential inner wall of the connecting ring (7) is provided with a mounting groove (29), and a sealing ring (30) is fixedly connected in the mounting groove (29). The circumferential inner wall of the sealing ring (30) is an eight-shaped ring.

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