A sealing structure of a rotary lifting shaft

Abstract

The utility model discloses a kind of sealing structure of rotary lifting shaft, including base, it has perforation;Shaft, it is matched with perforation, and, shaft can do axial lifting movement relative to base, and can do rotary motion along the central axis of shaft relative to base;Bearing, it is placed between perforation and shaft;Seal, it is placed between bearing and shaft;Bearing includes bearing outer ring and bearing inner ring, seal includes first sealing part on the bearing inner ring, the side of first sealing part close to shaft is formed with first sealing lip, the inside of first sealing lip is attached to the outer surface of shaft and forms first sealing interface, and, first sealing lip is always in interference fit with the outer surface of shaft by elastic deformation.The first sealing lip of the utility model always keeps interference fit with the outer surface of shaft by elastic deformation, ensure the continuity of sealing interface in the process of shaft lifting, adapt to the size change caused by reciprocating motion of shaft, avoid leakage or wear.

Description

Technical Field

[0001] This utility model relates to the technical field of shaft sealing, and in particular to a sealing structure for a rotary lifting shaft. Background Technology

[0002] As a composite motion involving the coupling of rotational and linear motion, the rotary lifting shaft presents a dual challenge to the dynamic tracking capability and lifespan reliability of the sealing system. Existing technical solutions mostly adopt a combined sealing architecture of "bearing + skeleton oil seal". This solution achieves radial limiting through the cooperation between the inner ring of the bearing and the shaft, and ensures axial positioning through the cooperation between the outer ring and the housing bore; the oil seal lip uses the spring clamping force or the elasticity of the material itself to form the initial sealing pressure, which, together with the lubricating grease film, achieves dynamic sealing.

[0003] However, the combined sealing structure of "bearing + skeleton oil seal" is not suitable for the combined motion of axial reciprocating displacement and 360° continuous rotation of the oil seal lip. At the same time, in order to achieve radial movement, the radial fit clearance between the inner ring of the bearing and the shaft will cause a dynamic impact effect. During the radial displacement, the shaft will have discontinuous contact with the inner ring of the bearing. This contact will cause scratches and abrasions on the shaft surface. This phenomenon will cause tearing damage to the oil seal, causing it to lose its sealing effect. In addition, the axial movement generated by the insertion and removal of the shaft and the rotational sealing characteristics of the sealing lip design are mismatched under working conditions, resulting in wear of the lip during repeated insertion and removal, leading to oil seal failure. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a sealing structure for a rotary lifting shaft. The first sealing lip maintains an interference fit with the outer surface of the shaft through elastic deformation, ensuring the continuity of the sealing interface during the lifting process of the shaft, adapting to the dimensional changes caused by the reciprocating motion of the shaft, and avoiding leakage or wear. Through the interference fit between the first sealing lip and the shaft, the combined working conditions of axial lifting (dynamic sealing) and rotational motion (radial sealing) are solved at the same time, avoiding the failure risk of traditional single sealing structures. It also blocks the metal contact between the shaft and the inner ring of the bearing, eliminating friction noise and wear from the root.

[0006] (II) Technical Solution

[0007] The solution adopted by this utility model to solve the above-mentioned technical problem is a sealing structure for a rotary lifting shaft, including...

[0008] The base has perforations;

[0009] The shaft body mates with the through hole, and the shaft body is capable of axial lifting and lowering relative to the base, and of rotating relative to the base along the central axis of the shaft body;

[0010] A bearing, which is positioned between the through hole and the shaft body;

[0011] A seal is placed between the bearing and the shaft.

[0012] The bearing includes an outer ring and an inner ring. The seal includes a first sealing portion that is sleeved on the inner ring. A first sealing lip is formed on the side of the first sealing portion near the shaft. The inner side of the first sealing lip is in contact with the outer surface of the shaft to form a first sealing interface. The first sealing lip is always in interference fit with the outer surface of the shaft through elastic deformation.

[0013] In some embodiments, a cup body is provided above the base; a stirring blade is connected to the top of the shaft, and the stirring blade is always placed inside the cup body; the axial lifting and lowering movement of the shaft can realize the lifting and lowering of the stirring blade; the rotational movement of the shaft can realize the rotational stirring action of the stirring blade.

[0014] Specifically, the first sealing part adopts an embedded structure ring sleeved on the inner ring of the bearing, so that the end of the first sealing part facing the shaft is a protruding structure, forming the first sealing lip. When the shaft performs reciprocating lifting and lowering motion, the sealing element and the shaft generate axial relative displacement. The first sealing lip maintains a constant interference with the outer surface of the shaft through elastic deformation, ensuring sealing performance equivalent to a standard dynamic sealing ring.

[0015] Using the above solution, the first sealing lip maintains an interference fit with the outer surface of the shaft through elastic deformation, ensuring the continuity of the sealing interface during shaft lifting and lowering, adapting to dimensional changes caused by the reciprocating motion of the shaft, and avoiding leakage or wear. Through the interference fit between the first sealing lip and the shaft, the combined working conditions of axial lifting (dynamic sealing) and rotational motion (radial sealing) are solved simultaneously, avoiding the failure risk of traditional single sealing structures, and also blocking the metal-to-metal contact between the shaft and the inner ring of the bearing, eliminating friction noise and wear from the root.

[0016] In some embodiments, a support frame for supporting the outer ring of the bearing is provided between the bearing and the through hole of the base. The support frame extends from the top of the outer ring of the bearing toward the shaft to form an extension arm. The seal includes a second sealing portion disposed above the first sealing portion. The second sealing portion includes a second sealing lip that cooperates with the extension arm and forms a second sealing interface.

[0017] Specifically, under rotational conditions, the seal rotates synchronously with the bearing inner ring and the shaft. The second sealing lip and the support frame form the second sealing interface, achieving equivalent sealing of a standard oil seal through radial interference fit. The double-lip design formed by the first and second sealing lips effectively avoids sealing interference under combined motion conditions. The axial displacement sealing lip automatically fills the radial gap between the shaft and the bearing inner ring during the sealing process, forming an elastic buffer layer that completely blocks metal-to-metal contact between the shaft and the bearing inner ring, eliminating the risk of collision and wear from the root. At the same time, the axial movement generated by the insertion and removal of the shaft matches the sealing characteristics of the first sealing lip under working conditions, supporting repeated disassembly and assembly of the shaft within the combined seal.

[0018] Using the above scheme, the second sealing lip and the support frame form a second sealing interface (radial seal), which, together with the first sealing lip (axial seal), constitutes a collaborative sealing system, significantly improving the reliability of leak prevention. Furthermore, the first sealing lip handles axial movement, while the second sealing lip handles rotational movement, each performing its specific function to avoid sealing interference. The elastic buffer layer of the first sealing lip automatically fills the radial gap between the shaft and the inner ring of the bearing, adapting to tolerance fluctuations during shaft insertion and removal, completely blocking metal-to-metal contact, eliminating the risk of collision and wear at the source, and extending service life. At the same time, the support frame provides additional support, improving the overall structural stability.

[0019] In some embodiments, the second sealing portion includes a groove covering the extension arm, the top wall of the groove extending downward to form the second sealing lip.

[0020] By adopting the above solution, the design of the groove covering the extension arm enhances the fit between the second sealing part and the support frame, preventing the seal from shifting or falling off under rotation conditions.

[0021] In some embodiments, the support frame includes a support arm that is tightly abutted between the inner wall of the perforation and the outer ring of the bearing, and an extension arm that extends from the top of the support arm toward the shaft; the portion of the extension arm near the shaft extends downward to form a first wall, and a second wall that extends from the first wall toward the shaft; the second sealing lip abuts against the second wall.

[0022] Using the above scheme, the extension arm provides directional support for the second sealing lip through the multi-segment structure of the first and second walls, ensuring uniform pressure distribution at the second sealing interface, and the second sealing lip abuts against the second wall to achieve precise sealing positioning.

[0023] In some embodiments, the support arm extends in a direction away from the bearing and forms an engagement groove for engaging the outer ring of the bearing.

[0024] By adopting the above solution, the locking groove locks the outer ring of the bearing, preventing the bearing from loosening during rotation or vibration and improving the overall structural rigidity; moreover, it makes the assembly of the outer ring of the bearing more convenient and improves assembly efficiency.

[0025] In some embodiments, the second wall is inclined from bottom to top towards the shaft at one end near the shaft to form an inclined wall, and the inclined wall, the second wall and the first wall cooperate to form a receiving groove for receiving the second sealing lip.

[0026] With the above solution, the receiving groove provides a dedicated receiving space for the second sealing lip, preventing damage, limiting excessive deformation of the second sealing lip, and maintaining long-term sealing performance; the inclined wall guides the assembly of the second sealing lip and avoids installation damage.

[0027] In some embodiments, the support frame has a magnetic structure to attract the outer ring of the bearing.

[0028] Specifically, an installation space is formed between the extension arm, the first wall, and the support arm. A magnet 900 is installed in the installation space and is positioned above the outer ring of the bearing to firmly attract the outer ring of the bearing and limit its wobbling.

[0029] Using the above solution, the magnetic structure firmly adheres to the outer ring of the bearing, suppressing bearing micro-movements or vibrations during high-speed rotation, improving operational stability, reducing noise, and extending bearing life; the 900 magnet assists in automatic alignment during bearing assembly, improving production efficiency.

[0030] In some embodiments, the base is provided with a support member at the bottom end of the perforation for supporting the bearing.

[0031] In some embodiments, the support member is detachably connected to the underside of the base.

[0032] The above solution allows for easy replacement of bearings and seals with detachable support components, reducing maintenance costs. The support components provide bottom support for the bearings, improving overall stability, and can also share the axial load of the bearings, preventing the base from being perforated and deformed due to long-term stress.

[0033] In some embodiments, the support member has an upwardly protruding portion below the outer ring of the bearing, a receiving space for accommodating the first sealing portion is formed between the support member and the inner ring of the bearing, and the bottom of the first sealing portion is provided with a plurality of wedge-shaped portions.

[0034] In some embodiments, the wedge-shaped portion is formed by extending from the bottom of the first sealing portion near the support member in a direction close to the support member.

[0035] Using the above solution, the protrusion ensures the precise positioning of the bearing, so that the outer ring of the bearing is confined between the magnet 900 and the protrusion; the wedge-shaped part has a guiding function, which facilitates assembly, increases the sealing contact area, improves sealing performance, and also helps to disperse the compressive stress at the bottom of the seal, avoiding local aging and cracking.

[0036] The working principle of this utility model:

[0037] The shaft is inserted into the seal. During insertion, the first sealing lip deforms, automatically filling the radial gap between the shaft and the bearing inner ring. As the shaft rotates and rises, the seal rotates synchronously with the bearing inner ring and the shaft. The first sealing lip of the seal is interference-fitted with the shaft, forming the first sealing interface, filling the gap between the shaft and the bearing, preventing media leakage and buffering impact. The second sealing lip of the seal is interference-fitted with the support frame, independently forming an oil seal effect. Simultaneously, the second sealing lip continuously compensates for displacement, ensuring sealing reliability under the combined axial reciprocating and rotational motions.

[0038] (III) Beneficial Effects

[0039] Compared with the prior art, this utility model designs a sealing structure for a rotary lifting shaft.

[0040] (1) The first sealing lip of this utility model maintains an interference fit with the outer surface of the shaft through elastic deformation, ensuring the continuity of the sealing interface during the lifting and lowering of the shaft, adapting to the dimensional changes caused by the reciprocating motion of the shaft, and avoiding leakage or wear; through the interference fit between the first sealing lip and the shaft, the combined working conditions of axial lifting (dynamic sealing) and rotational motion (radial sealing) are solved at the same time, avoiding the failure risk of traditional single sealing structure, and also blocking the metal contact between the shaft and the inner ring of the bearing, eliminating friction noise and wear from the root.

[0041] (2) The second sealing lip of this utility model forms a second sealing interface (radial sealing) with the support skeleton, and together with the first sealing lip (axial sealing), it constitutes a cooperative sealing system, which significantly improves the reliability of leakage prevention. Moreover, the first sealing lip handles axial movement and the second sealing lip handles rotational movement, each performing its own function to avoid sealing interference. The elastic buffer layer of the first sealing lip automatically fills the radial gap between the shaft and the inner ring of the bearing, adapts to the tolerance fluctuations when the shaft is inserted and removed, completely blocks metal contact, eliminates the risk of collision and wear from the root, and extends the service life. At the same time, the support skeleton provides additional support and improves the overall structural stability.

[0042] (3) The groove-covered extension arm design of this utility model enhances the fit between the second sealing part and the support frame, preventing the seal from shifting or falling off under rotation conditions; the extension arm provides directional support for the second sealing lip through the multi-segment structure of the first and second walls, ensuring uniform pressure distribution at the second sealing interface, and the second sealing lip abuts against the second wall to achieve precise sealing positioning; the locking groove locks the bearing outer ring, preventing the bearing from loosening during rotation or vibration, and improving the overall structural rigidity; and makes the assembly of the bearing outer ring more convenient and improves assembly efficiency.

[0043] (4) The receiving groove of this utility model provides a special receiving space for the second sealing lip, preventing damage, limiting excessive deformation of the second sealing lip, and maintaining long-term sealing performance; the inclined wall guides the assembly of the second sealing lip and avoids installation damage;

[0044] (5) This utility model uses a magnetic structure to firmly attract the outer ring of the bearing, suppressing the bearing micro-movement or vibration during high-speed rotation, improving operational stability, reducing noise and extending bearing life; the 900 magnet assists in the automatic alignment during bearing assembly, improving production efficiency.

[0045] (6) The detachable support of this utility model facilitates the replacement of bearings and seals, reduces maintenance costs, provides bottom support for the bearing, improves overall stability, and can also share the axial load of the bearing, preventing the base from being perforated and deformed due to long-term stress.

[0046] (7) The protrusion of this utility model ensures the precise positioning of the bearing so that the outer ring of the bearing is restricted between the magnet 900 and the protrusion; the wedge has a guiding function, which facilitates assembly, enhances the sealing contact area, improves sealing performance, and also helps to disperse the compressive stress at the bottom of the seal and avoid local aging and cracking. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a cross-sectional view of a sealing structure for a rotary lifting shaft according to the present invention;

[0049] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0050] Figure 3 This is a cross-sectional view of the sealing element of this utility model;

[0051] Figure 4This is a cross-sectional view of the support frame of this utility model.

[0052] The component names corresponding to the various reference numerals in the figure are as follows: 100, base; 101, perforation; 200, shaft; 201, stirring blade; 300, bearing; 301, bearing outer ring; 302, bearing inner ring; 400, seal; 401, first sealing part; 4011, first sealing lip; 4012, wedge-shaped part; 402, second sealing part; 4021, second sealing lip; 4022, groove; 500, support frame; 501, extension arm; 5011, first wall; 5012, second wall; 5013, inclined wall; 5014, receiving groove; 502, support arm; 5021, engaging groove; 503, installation space; 600, support member; 601, protrusion; 700, receiving space; 800, cup body; 900, magnet. Detailed Implementation

[0053] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0054] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0057] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0058] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0059] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0060] like Figures 1-4As shown, this utility model provides a sealing structure for a rotary lifting shaft, including a base 100 having a through hole 101; a shaft 200 that mates with the through hole 101, wherein the shaft 200 is capable of axial lifting relative to the base 100 and rotational movement relative to the base 100 along its central axis; a bearing 300 disposed between the through hole 101 and the shaft 200; and a seal 400 disposed between the bearing 300 and the shaft 200. The bearing 300 includes an outer ring 301 and an inner ring 302. The seal 400 includes a first sealing portion 401 that is sleeved on the inner ring 302. A first sealing lip 4011 is formed on the side of the first sealing portion 401 near the shaft 200. The inner side of the first sealing lip 4011 is in contact with the outer surface of the shaft 200 to form a first sealing interface. The first sealing lip 4011 is always in an interference fit with the outer surface of the shaft 200 through elastic deformation. In some embodiments, a cup 800 is provided above the base 100. A stirring blade 201 is connected to the top of the shaft 200. The stirring blade 201 is always placed inside the cup 800. The axial lifting and lowering movement of the shaft 200 can realize the lifting and lowering of the stirring blade 201. The rotational movement of the shaft 200 can realize the rotational stirring action of the stirring blade 201. Specifically, the first sealing part 401 is embedded in the bearing inner ring 302, so that the end of the first sealing part 401 facing the shaft 200 is a protruding structure, forming the first sealing lip 4011. When the shaft 200 performs reciprocating lifting motion, the sealing part 400 and the shaft 200 generate axial relative displacement. The first sealing lip 4011 maintains a constant interference with the outer surface of the shaft 200 through elastic deformation, ensuring sealing performance equivalent to a standard dynamic sealing ring. By adopting the above solution, the first sealing lip 4011 maintains an interference fit with the outer surface of the shaft 200 through elastic deformation, ensuring the continuity of the sealing interface during the lifting and lowering of the shaft 200, adapting to the dimensional changes caused by the reciprocating motion of the shaft 200, and avoiding leakage or wear. Through the interference fit between the first sealing lip 4011 and the shaft 200, the combined working conditions of axial lifting (dynamic sealing) and rotational motion (radial sealing) are solved at the same time, avoiding the failure risk of traditional single sealing structures, and also blocking the metal contact between the shaft 200 and the inner ring 302 of the bearing, eliminating friction noise and wear from the root.

[0061] In some embodiments, a support frame 500 for supporting the bearing outer ring 301 is provided between the bearing 300 and the through hole 101 of the base 100. The support frame 500 extends from the top of the bearing outer ring 301 toward the shaft 200 to form an extension arm 501. The seal 400 includes a second sealing part 402 disposed above the first sealing part 401. The second sealing part 402 includes a second sealing lip 4021 that cooperates with the extension arm 501 and forms a second sealing interface. Specifically, under rotational conditions, the seal 400 rotates synchronously with the bearing inner ring 302 and the shaft 200. The second sealing lip 4021 and the support frame 500 form the second sealing interface, achieving equivalent sealing of a standard oil seal through radial interference fit. The double-lip design formed by the first sealing lip 4011 and the second sealing lip 4021 effectively avoids sealing interference under compound motion conditions. The axial displacement sealing lip automatically fills the radial gap between the shaft 200 and the bearing inner ring 302 during the sealing process, forming an elastic buffer layer, completely blocking the metal contact between the shaft 200 and the bearing inner ring 302, eliminating the risk of collision and wear from the root. At the same time, the axial movement generated by the insertion and removal of the shaft 200 matches the working condition sealing characteristics of the first sealing lip 4011, supporting repeated disassembly and assembly of the shaft 200 within the combined seal 400. Using the above scheme, the second sealing lip 4021 and the support frame 500 form a second sealing interface (radial seal), which together with the first sealing lip 4011 (axial seal) constitutes a cooperative sealing system, significantly improving the reliability of leakage prevention. Moreover, the first sealing lip 4011 handles axial movement, and the second sealing lip 4021 handles rotational movement, each performing its own function to avoid sealing interference. The elastic buffer layer of the first sealing lip 4011 automatically fills the radial gap between the shaft 200 and the bearing inner ring 302, adapting to the tolerance fluctuations when the shaft 200 is inserted and removed, completely blocking metal-to-metal contact, eliminating the risk of collision and wear from the root, and extending service life. At the same time, the support frame 500 provides additional support, improving the overall structural stability.

[0062] In some embodiments, the second sealing portion 402 includes a groove 4022 covering the extension arm 501, the top wall of the groove 4022 extending downward to form the second sealing lip 4021. With this design, the groove 4022 covering the extension arm 501 enhances the fit between the second sealing portion 402 and the support frame 500, preventing displacement or detachment of the seal 400 under rotational conditions. In some embodiments, the support frame 500 includes a support arm 502 tightly abutting between the inner wall of the through hole 101 and the outer ring 301 of the bearing, and an extension arm 501 extending from the top of the support arm 502 toward the shaft 200; the portion of the extension arm 501 near the shaft 200 extending downward to form a first wall 5011, and a second wall 5012 extending from the first wall 5011 toward the shaft 200; the second sealing lip 4021 abuts against the second wall 5012. Using the above scheme, the extension arm 501 provides directional support for the second sealing lip 4021 through the multi-segment structure of the first wall 5011 and the second wall 5012, ensuring uniform pressure distribution at the second sealing interface. Furthermore, the second sealing lip 4021 abuts against the second wall 5012, achieving precise sealing positioning. In some embodiments, the support arm 502 extends away from the bearing 300 to form a locking groove 5021 for engaging the bearing outer ring 301. Using the above scheme, the locking groove 5021 locks the bearing outer ring 301, preventing the bearing 300 from loosening during rotation or vibration, thus improving the overall structural rigidity; and making the assembly of the bearing outer ring 301 more convenient and improving assembly efficiency. In some embodiments, the end of the second wall 5012 near the shaft 200 is inclined from bottom to top towards the shaft 200 to form an inclined wall 5013. The inclined wall 5013, the second wall 5012, and the first wall 5011 cooperate to form a receiving groove 5014 for accommodating the second sealing lip 4021. Using the above solution, the receiving groove 5014 provides a dedicated receiving space 700 for the second sealing lip 4021 to prevent damage, limit excessive deformation of the second sealing lip 4021, and maintain long-term sealing performance; the inclined wall 5013 guides the assembly of the second sealing lip 4021 to avoid installation damage.

[0063] In some embodiments, the support frame 500 has a magnetic structure to attract the bearing outer ring 301. Specifically, an installation space 503 is formed between the extension arm 501, the first wall 5011, and the support arm 502. A magnet 900 is installed in the installation space 503, and the magnet 900 is positioned above the bearing outer ring 301 to firmly attract the bearing outer ring 301 and limit its wobbling. With this solution, the magnetic structure firmly attracts the bearing outer ring 301, suppressing the micro-movement or vibration of the bearing 300 during high-speed rotation, improving operational stability, reducing noise, and extending the bearing 300's lifespan. The magnet 900 also assists in the automatic alignment of the bearing 300 during assembly, improving production efficiency.

[0064] In some embodiments, a support member 600 for supporting the bearing 300 is provided at the bottom end of the base 100 at the through hole 101. In some embodiments, the support member 600 is detachably connected to the bottom of the base 100. With the above solution, the detachable support member 600 facilitates the replacement of the bearing 300 and the seal 400, reducing maintenance costs. The support member 600 provides bottom support for the bearing 300, improving overall stability, and can also share the axial load of the bearing 300, preventing the through hole 101 of the base 100 from deforming due to long-term stress. In some embodiments, the support member 600 has an upwardly protruding portion 601 below the outer ring 301 of the bearing, and a receiving space 700 for accommodating the first seal 401 is formed between the support member 600 and the inner ring 302 of the bearing. Furthermore, the bottom of the first seal 401 is provided with a plurality of wedge-shaped portions 4012. In some embodiments, the wedge-shaped portion 4012 is formed by extending from the bottom end of the first sealing portion 401 near the support member 600 in a direction close to the support member 600. With this design, the protrusion 601 ensures precise positioning of the bearing 300, so that the outer ring 301 of the bearing is confined between the magnet 900 and the protrusion 601; the wedge-shaped portion 4012 has a guiding function, facilitating assembly, increasing the sealing contact area, improving sealing performance, and also helping to disperse compressive stress at the bottom of the seal member 400, preventing localized aging and cracking.

[0065] The working principle of this utility model:

[0066] The shaft 200 is inserted into the seal 400. The first sealing lip 4011 deforms during insertion, automatically filling the radial gap between the shaft 200 and the bearing inner ring 302. During the rotation and lifting of the shaft 200, the seal 400 rotates synchronously with the bearing inner ring 302 and the shaft 200. The first sealing lip 4011 of the seal 400 is interference-fitted with the shaft 200, forming a first sealing interface, filling the gap between the shaft 200 and the bearing 300, preventing media leakage and buffering impact. The second sealing lip 4021 of the seal 400 is interference-fitted with the support frame 500, independently forming an oil seal effect. Simultaneously, the second sealing lip 4021 continuously compensates for displacement, ensuring sealing reliability under the combined axial reciprocating and rotational motions. Similar or identical parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0067] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sealing structure for a rotary lifting shaft, characterized in that: include Base (100) having a perforation (101); The shaft (200) is fitted with the through hole (101), and the shaft (200) is capable of axial lifting relative to the base (100) and rotational movement relative to the base (100) along the central axis of the shaft (200). A bearing (300) is positioned between the through hole (101) and the shaft (200); A seal (400) is placed between the bearing (300) and the shaft (200); The bearing (300) includes an outer ring (301) and an inner ring (302). The seal (400) includes a first sealing part (401) that is sleeved on the inner ring (302). A first sealing lip (4011) is formed on the side of the first sealing part (401) near the shaft (200). The inner side of the first sealing lip (4011) is attached to the outer surface of the shaft (200) to form a first sealing interface. The first sealing lip (4011) is always in interference fit with the outer surface of the shaft (200) through elastic deformation.

2. The sealing structure of the rotary lifting shaft according to claim 1, characterized in that: A support frame (500) for supporting the outer ring (301) of the bearing (300) and the base (100) is provided between the through hole (101). The support frame (500) extends from the top of the outer ring (301) toward the shaft (200) to form an extension arm (501). The seal (400) includes a second sealing part (402) disposed above the first sealing part (401). The second sealing part (402) includes a second sealing lip (4021) that cooperates with the extension arm (501) and forms a second sealing interface.

3. The sealing structure of the rotary lifting shaft according to claim 2, characterized in that: The second sealing portion (402) includes a groove (4022) covering the extension arm (501), the top wall of the groove (4022) extending downward to form the second sealing lip (4021).

4. The sealing structure of the rotary lifting shaft according to claim 2, characterized in that: The support frame (500) includes a support arm (502) that is tightly attached between the inner wall of the perforation (101) and the outer ring (301) of the bearing, and an extension arm (501) that extends from the top of the support arm (502) toward the shaft (200); the portion of the extension arm (501) near the shaft (200) extends downward to form a first wall (5011), and a second wall (5012) that extends from the first wall (5011) toward the shaft (200); the second sealing lip (4021) abuts against the second wall (5012).

5. The sealing structure of the rotary lifting shaft according to claim 4, characterized in that: The support arm (502) extends in a direction away from the bearing (300) and forms an engagement groove (5021) for engaging the outer ring (301) of the bearing.

6. The sealing structure of the rotary lifting shaft according to claim 4, characterized in that: The second wall (5012) is inclined from bottom to top towards the shaft (200) to form an inclined wall (5013). The inclined wall (5013), the second wall (5012) and the first wall (5011) cooperate to form a receiving groove (5014) for receiving the second sealing lip (4021).

7. The sealing structure of the rotary lifting shaft according to claim 2, characterized in that: The support frame (500) has a magnetic structure to attract the outer ring (301) of the bearing.

8. The sealing structure of the rotary lifting shaft according to claim 1, characterized in that: The base (100) is provided with a support member (600) for supporting the bearing (300) at the bottom end of the perforation (101).

9. The sealing structure of the rotary lifting shaft according to claim 8, characterized in that: The support member (600) is located below the outer ring (301) of the bearing and protrudes upward to form a protrusion (601). A receiving space (700) for receiving the first sealing part (401) is formed between the support member (600) and the inner ring (302) of the bearing. Furthermore, a plurality of wedge-shaped parts (4012) are provided at the bottom of the first sealing part (401).

10. The sealing structure of the rotary lifting shaft according to claim 9, characterized in that: The wedge-shaped portion (4012) is formed by extending from the bottom of the first sealing portion (401) near the support member (600) in a direction close to the support member (600).

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