Low-resistance carrier roller device

Abstract

The low-resistance carrier roller device comprises a carrier roller, a bearing seat and a first sealing assembly, the carrier roller comprises a roller and a rotating shaft, the roller is arranged on the rotating shaft in a penetrating mode, the bearing seat comprises a shell with an opening and a bearing arranged in the shell, one end of the rotating shaft penetrates through the opening and is arranged on the bearing in a penetrating mode, and the other end of the rotating shaft is connected with the first sealing assembly. The first sealing assembly is arranged in the shell and arranged on the rotating shaft in a penetrating mode, the inner circumferential face of the first sealing assembly and the outer circumferential face of the rotating shaft are arranged at intervals in the radial direction of the rotating shaft and are filled with magnetic liquid, and the first sealing assembly is located on the side, close to the opening, of the bearing. The first sealing assembly seals the opening with the magnetic liquid. The low-resistance carrier roller device has the advantages of being low in resistance, small in leakage, long in service life and the like.

Description

Technical Field

[0001] The utility model relates to the field of mining machinery, in particular to a magnetic liquid sealed low-resistance long-life low-resistance roller device. Background Art

[0002] The working environment of rollers is generally bad, such as high dust and high moisture environment. The main problem during use is the increase of rotation resistance, and in serious cases, it may even get stuck, causing serious safety accidents. Studies have shown that most roller failures are caused by seal leakage, which causes pollutants to enter the bearings and make them lose lubrication.

[0003] In the related technology, the common sealing methods for rollers are non-contact labyrinth seals and contact lip seals. The labyrinth has small resistance, simple structure and low cost, but it cannot fully guarantee the stable and reliable operation of the rollers due to the large dust and harsh environment in the well. The lip seal has good dust and water resistance, but it has large rotation resistance, increases energy consumption, and has a short life span and requires frequent maintenance and replacement. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the utility model provides a low-resistance roller device with good sealing performance and simple structure.

[0006] According to an embodiment of the utility model, the low-resistance roller device includes: a roller, the roller includes a roller and a rotating shaft, the roller is inserted on the rotating shaft; a bearing seat, the bearing seat includes a shell with an opening and a bearing arranged in the shell, one end of the rotating shaft passes through the opening and is inserted on the bearing, so that the rotating shaft is supported in the shell through the bearing; a first sealing component, the first sealing component is arranged in the shell and inserted on the rotating shaft, the first sealing component is located on a side of the bearing adjacent to the opening, the inner circumferential surface of the first sealing component and the outer circumferential surface of the rotating shaft are arranged at intervals along the radial direction of the rotating shaft and are filled with magnetic liquid, the first sealing component can generate a magnetic field, so as to adsorb the magnetic liquid between the rotating shaft and the first sealing component to seal the opening.

[0007] The low-resistance roller device of the embodiment of the utility model is provided with a first sealing component, so that the magnetic liquid forms a liquid sealing ring under the action of the magnetic field of the first sealing component to seal the opening of the shell, which can prevent the invasion of pollutants such as dust, protect the normal operation of the bearing, and extend the service life of the roller.

[0008] In some embodiments, the first sealing assembly includes: a plurality of pole shoes, the plurality of pole shoes are disposed in the housing and sleeved on the rotating shaft, the inner circumferential surfaces of the plurality of pole shoes and the outer circumferential surface of the rotating shaft are arranged at radial intervals along the rotating shaft and are filled with magnetic liquid; a permanent magnet, the permanent magnet is disposed in the housing and surrounds the outer circumferential side of the rotating shaft, and the permanent magnet is located between adjacent pole shoes.

[0009] In some embodiments, the first sealing assembly further includes a plurality of first sealing rings, at least one of which is sleeved on the outer circumferential surface of the pole shoe and located between the pole shoe and the housing, so that the first sealing ring seals the pole shoe and the housing.

[0010] In some embodiments, the low-resistance roller device further comprises a magnetic isolation ring, wherein the magnetic isolation ring is disposed in the housing and located between the bearing and the first sealing assembly.

[0011] In some embodiments, the low-resistance roller device further includes a retaining ring with a magnetic isolation function, wherein the retaining ring is disposed in the housing and is located on a side of the first sealing component adjacent to the opening.

[0012] In some embodiments, the inner circumference of the pole shoe is provided with a plurality of pole teeth, the plurality of pole teeth are arranged at intervals along the axial direction of the rotating shaft, the pole teeth and the outer circumference of the rotating shaft are arranged at intervals along the radial direction of the rotating shaft, and the magnetic liquid is filled between the pole teeth and the rotating shaft.

[0013] In some embodiments, the low-resistance roller device further includes a protective cover, which is sleeved on the rotating shaft and at least part of which is located in the opening, and the protective cover is used to prevent dust or water from flowing into the shell.

[0014] In some embodiments, the protective cover and the first sealing assembly are spaced apart from each other along the axial direction of the rotating shaft.

[0015] In some embodiments, the low-resistance roller device also includes a second sealing assembly, which is sleeved on the rotating shaft and located in the housing, and the second sealing assembly is arranged on the side of the bearing away from the first sealing assembly. The inner circumferential surface of the second sealing assembly and the outer circumferential surface of the rotating shaft are arranged at intervals along the radial direction of the rotating shaft and are filled with the magnetic liquid. The second sealing assembly can generate a magnetic field so as to adsorb the magnetic liquid between the rotating shaft and the second sealing assembly to seal the bearing.

[0016] In some embodiments, the low-resistance roller device also includes a third sealing assembly, which is sleeved on the rotating shaft and located in the housing. The third sealing assembly is arranged on the side of the bearing away from the first sealing assembly so that the third sealing assembly seals the bearing. The third sealing assembly can be a non-contact labyrinth sealing assembly or a contact lip sealing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a low resistance roller device according to an embodiment of the utility model.

[0018] Figure 2 This is a partial enlarged view of A in 1.

[0019] Low resistance roller device 100;

[0020] Shaft 1;

[0021] Bearing seat 2; housing 21; opening 211; bearing 22;

[0022] The first sealing assembly 3; the pole shoe 31; the pole tooth 311; the permanent magnet 32; the first sealing ring 33; the magnetic isolation ring 34; the retaining ring 35; the magnetic liquid 36;

[0023] Protective cover 4; third sealing assembly 5; first part 51; second part 52. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0025] The low resistance roller device 100 according to an embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0026] like Figure 1-2 As shown, the low-resistance roller device 100 according to the embodiment of the utility model includes a roller, a bearing seat 2 and a first sealing assembly 3.

[0027] The roller includes a roller (not shown in the figure) and a rotating shaft 1, and the roller is arranged on the rotating shaft 1. Specifically, Figure 1 As shown, the rotating shaft 1 penetrates the drum in the left-right direction, and the drum rotates through the rotating shaft 1.

[0028] The bearing housing 2 includes a housing 21 having an opening 211 and a bearing 22 disposed in the housing 21. One end of the rotating shaft 1 passes through the opening 211 and is disposed on the bearing 22, so that the rotating shaft 1 is supported in the housing 21 through the bearing 22. Specifically, Figure 1As shown, the housing 21 is a chamber with an opening 211 facing rightward, the bearing 22 is arranged in the housing 21 and the outer periphery of the bearing 22 is interference fit with the inner periphery of the housing 21, the left end of the rotating shaft 1 is passed through the housing 21 and the inner ring of the bearing 22 is interference fit with the outer periphery of the rotating shaft 1, so that the rotating shaft 1 is rotatably supported in the housing 21 through the bearing 22.

[0029] The first sealing assembly 3 is disposed in the housing 21 and penetrates the rotating shaft 1. The first sealing assembly 3 is located on the side of the bearing 22 adjacent to the opening 211. The inner circumference of the first sealing assembly 3 and the outer circumference of the rotating shaft 1 are spaced apart in the radial direction of the rotating shaft 1 (such as Figure 1 The first sealing component 3 is provided with a magnetic liquid 36 in the inner and outer directions as shown, and the first sealing component 3 can generate a magnetic field so as to adsorb the magnetic liquid 36 between the rotating shaft 1 and the first sealing component 3 to seal the opening 211. Specifically, as shown in FIG. Figure 1 As shown, the first sealing component 3 is a magnetic liquid sealing component, and the first sealing component 3 is arranged in the housing 21 and is located on the right side of the bearing 22. The first sealing component 3 is provided with a through hole that penetrates the first sealing component 3 in the left-right direction. The rotating shaft 1 passes through the through hole and extends into the housing 21. The outer circumferential surface of the rotating shaft 1 and the inner circumferential surface of the through hole are arranged at an interval. The magnetic liquid 36 is filled in the through hole and is located between the rotating shaft 1 and the first sealing component 3. Therefore, the first sealing component 3 can absorb the magnetic liquid 36 between the rotating shaft 1 and the first sealing component 3 to seal the opening 211 of the housing 21.

[0030] The low-resistance roller device 100 of the utility model embodiment is provided with a first sealing component 3, so that the magnetic liquid 36 forms a liquid sealing ring under the action of the magnetic field of the first sealing component 3 to seal the opening 211 of the shell 21, which can prevent the invasion of pollutants such as dust. Since the magnetic liquid 36 seal has the advantages of small leakage, low resistance, high reliability, and long life, it is suitable for harsh environments such as high speed, high temperature, and high pressure. Compared with the non-contact labyrinth seal in the relevant technology, the first sealing component 3 and the magnetic liquid 36 seal and protect the stable and reliable operation of the roller, and extend the service life of the roller. Moreover, the liquid sealing ring formed by the magnetic liquid 36 can effectively reduce the rotation resistance of the rotating shaft 1 of the roller, reduce the operating power of the conveyor, save electricity consumption, and improve the conveying efficiency, compared with the contact lip seal in the relevant technology.

[0031] In some embodiments, the first sealing assembly 3 includes a plurality of pole pieces 31 and a permanent magnet 32 ​​.

[0032] A plurality of pole shoes 31 are disposed in the housing 21 and sleeved on the rotating shaft 1. The inner circumference of the plurality of pole shoes 31 and the outer circumference of the rotating shaft 1 are spaced apart along the radial direction of the rotating shaft 1 and filled with magnetic fluid 36. A permanent magnet 32 ​​is disposed in the housing 21 and surrounds the outer circumference of the rotating shaft 1. The permanent magnet 32 ​​is located between adjacent pole shoes 31.

[0033] Specifically, Figure 1 As shown, a plurality of pole shoes 31 are arranged at intervals along the left-right direction and sleeved on the rotating shaft 1, and the inner circumference of each pole shoe 31 is arranged at intervals along the inner-outer direction with the outer circumference of the rotating shaft 1, and the magnetic liquid 36 is filled between the inner circumference of the pole shoe 31 and the outer circumference of the rotating shaft 1. The permanent magnet 32 ​​is arranged in the housing 21 and is located between two adjacent pole shoes 31. Thus, the permanent magnet 32, the pole shoe 31, and the magnetic liquid 36 constitute a closed magnetic circuit, and the permanent magnet 32 ​​is used to generate a non-uniform magnetic field with alternating strong and weak between the pole shoe 31 and the rotating shaft 1, and the magnetic liquid 36 is adsorbed between the pole shoe 31 and the rotating shaft 1, so that the magnetic liquid 36 is filled in the gap, generating pressure resistance, and achieving the purpose of sealing.

[0034] In some embodiments, the first sealing assembly 3 further includes a plurality of first sealing rings 33, at least one of which is sleeved on the outer circumferential surface of the pole shoe 31 and is located between the pole shoe 31 and the housing 21, so that the first sealing ring 33 seals the pole shoe 31 and the housing 21. Specifically, as Figure 1 As shown, the number of first sealing rings 33 can be equal to the number of pole shoes 31, or can be greater than the number of pole shoes 31. The outer peripheral surface of each pole shoe 31 is provided with a mounting groove extending in the inner and outer directions. The first sealing ring 33 is arranged in the mounting groove and at least part of the first sealing ring 33 protrudes from the mounting groove. The outer peripheral surface of the first sealing ring 33 and the outer peripheral surface of the shell 21 are abutted against each other, thereby sealing the first sealing assembly 3 and the shell 21 to prevent dust or water from flowing into the shell 21, further ensuring the service life of the bearing 22.

[0035] In some embodiments, the low resistance roller device 100 further includes a magnetic isolation ring 34, which is disposed in the housing 21 and between the bearing 22 and the first sealing assembly 3. Specifically, Figure 1 As shown, the magnetic isolation ring 34 is provided on the rotating shaft 1 and is located between the left side of the first sealing assembly 3 and the right side of the bearing 22. The outer circumference of the magnetic isolation ring 34 is in contact with the inner circumference of the housing 21, thereby positioning the magnetic isolation ring 34 to prevent the magnetic isolation ring 34 from moving in the housing 21 in the inner and outer directions and causing damage to the parts in the housing 21 or generating noise. The inner circumference of the magnetic isolation ring 34 is spaced apart from the outer circumference of the rotating shaft 1, thereby facilitating the installation of the magnetic isolation ring 34. Since the magnetic isolation ring 34 has the ability to block the magnetic field, it prevents the magnetic field lines of the first sealing assembly 3 from being lost, thereby ensuring the sealing performance of the first sealing assembly 3.

[0036] In some embodiments, the low resistance roller device 100 further includes a retaining ring 35 having a magnetic isolation function, and the retaining ring 35 is disposed in the housing 21 and located on a side of the first sealing component 3 adjacent to the opening 211. Specifically, as Figure 1As shown, the retaining ring 35 is a magnetic isolation material, and the retaining ring 35 is sleeved in the shell 21 and is located on the right side of the first sealing component 3. The outer circumferential surface of the retaining ring 35 is against the inner circumferential surface of the shell 21, and the left side of the retaining ring 35 is against the right side of the first sealing component 3. Therefore, the retaining ring 35 can not only prevent the loss of magnetic lines of force of the first sealing component 3, but also prevent iron filings and other materials in the environment from being attracted to the pole shoe 31 by magnetic force, and can also press the first sealing component 3, so that multiple pole shoes 31 and permanent magnets 32 are in close contact, thereby ensuring the sealing performance of the first sealing component 3.

[0037] In some embodiments, the inner circumference of the pole shoe 31 is provided with a plurality of pole teeth 311, the plurality of pole teeth 311 are arranged at intervals along the axial direction of the rotating shaft 1, the pole teeth 311 and the outer circumference of the rotating shaft 1 are arranged at intervals along the radial direction of the rotating shaft 1, and the magnetic liquid 36 is filled between the pole teeth 311 and the rotating shaft 1. Specifically, as Figure 2 As shown, multiple pole teeth 311 are arranged on the inner circumference of the pole shoe 31 and are arranged at equal intervals in the left-right direction. The inner circumference of the multiple pole teeth 311 and the outer circumference of the rotating shaft 1 are arranged at intervals in the inside-outside direction, and the magnetic liquid 36 is filled between the inner circumference of the pole teeth 311 and the outer circumference of the rotating shaft 1. Therefore, through the magnetic energy in the permanent magnet 32, a strong and weak alternating non-uniform magnetic field is generated in the gap between the pole teeth 311 of the pole shoe 31, thereby adsorbing the magnetic liquid 36 between the pole teeth 311 and the rotating shaft 1, forming a magnetic liquid 36 sealing ring, and then blocking the gap between the pole shoe 31 and the rotating shaft 1, thereby achieving the purpose of sealing.

[0038] In some embodiments, the low-resistance roller device 100 further includes a protective cover 4, which is sleeved on the rotating shaft 1 and at least part of the protective cover 4 is located in the opening 211, and the protective cover 4 is used to prevent dust or water from flowing into the housing 21. Specifically, Figure 1 As shown, the protective cover 4 is arranged at the opening 211 of the shell 21, and the rotating shaft 1 passes through the protective cover 4 and extends into the shell 21. The outer circumference of the rotating shaft 1 can be interference fit with the inner circumference of the protective cover 4, so that the rotating shaft 1 drives the protective cover 4 to rotate. The protective cover 4 can play a role in dustproof and waterproofing the interior of the shell 21, thereby preliminarily sealing the shell 21.

[0039] Since the protective cover 4 rotates with the rotating shaft 1 and is relatively stationary with the rotating shaft 1, and the first sealing assembly 3 does not rotate with the rotating shaft 1. Therefore, in some embodiments, the protective cover 4 and the first sealing assembly 3 are spaced axially from each other along the rotating shaft 1 (e.g. Figure 1 Specifically, Figure 1 As shown, the protective cover 4 and the retaining ring 35 are spaced apart in the left-right direction, thereby preventing friction between the protective cover 4 and the retaining ring 35, reducing the wear of the protective cover 4, and ensuring the service life of the protective cover 4.

[0040] In some embodiments, the low resistance roller device 100 further includes a third sealing assembly 5, which is sleeved on the rotating shaft 1 and located in the housing 21. The third sealing assembly 5 is arranged on the side of the bearing 22 away from the first sealing assembly 3. The inner circumference of the third sealing assembly 5 abuts against the outer ring of the rotating shaft 1, and at least part of the outer circumference of the third sealing assembly 5 abuts against the outer circumference of the bearing 22. Specifically, Figure 1 As shown, the third sealing assembly 5 is arranged on the left side of the bearing 22 and is located in the housing 21. The rotating shaft 1 passes through the third sealing assembly 5 and the outer circumferential surface of the rotating shaft 1 is abutted against the inner circumferential surface of the third sealing assembly 5. The outer circumferential surface of the third sealing assembly 5 is abutted against the outer circumferential surface of the bearing 22, so that the left side of the bearing 22 is sealed by the third sealing assembly 5 to prevent the lubricating oil on the left side of the bearing 22 from leaking.

[0041] In some embodiments, the low-resistance roller device 100 also includes a second sealing assembly (not shown in the figure), which is sleeved on the rotating shaft 1 and located in the housing 21. The second sealing assembly is arranged on the side of the bearing 22 away from the first sealing assembly 3. The inner circumferential surface of the second sealing assembly and the outer circumferential surface of the rotating shaft 1 are arranged at intervals along the radial direction of the rotating shaft 1 and are filled with magnetic liquid. The second sealing assembly can generate a magnetic field so as to adsorb the magnetic liquid between the rotating shaft 1 and the second sealing assembly to seal the bearing 22.

[0042] Specifically, the second sealing component is arranged on the left side of the bearing 22 and is located in the housing 21, and the second sealing component is a magnetic liquid sealing component. The second sealing component is provided with a through hole that penetrates the second sealing component in the left-right direction. The rotating shaft 1 passes through the through hole and extends out of the housing 21, and the outer circumferential surface of the rotating shaft 1 and the inner circumferential surface of the through hole of the second sealing component are arranged at intervals. The magnetic liquid is filled in the through hole and is located between the rotating shaft 1 and the second sealing component. Therefore, the second sealing component can adsorb the magnetic liquid between the rotating shaft 1 and the second sealing component to seal the bearing 22 of the housing 21, prevent pollutants such as dust from entering the bearing 22 from the left side of the housing 21, and prevent the lubricating oil on the left side of the bearing 22 from leaking.

[0043] It should be noted that the second sealing assembly has the same structure as the first sealing assembly, and the low-resistance roller device 100 of the embodiment of the utility model will not be described in detail.

[0044] In some embodiments, the low resistance roller device 100 further includes a third sealing assembly 5, which is sleeved on the rotating shaft 1 and located in the housing 21. The third sealing assembly 5 is arranged on the side of the bearing 22 away from the first sealing assembly 3, so that the third sealing assembly 5 seals the bearing 22. The third sealing assembly 5 can be a non-contact labyrinth sealing assembly or a contact lip sealing assembly. Specifically, Figure 1As shown, the third sealing assembly 5 is arranged on the left side of the bearing 22 and is located in the housing 21. The third sealing assembly 5 can be fundamentally selected as a non-contact labyrinth sealing assembly or a contact lip sealing assembly, so that the left side of the bearing 22 is sealed by the third sealing assembly 5 to prevent pollutants such as dust from entering the bearing 22 from the left side of the housing 21, and to prevent the lubricating oil on the left side of the bearing 22 from leaking.

[0045] In some embodiments, the third sealing assembly 5 has a first part 51 and a second part 52 connected in sequence along the radial direction of the rotating shaft 1, the first part 51 extends along the radial direction of the rotating shaft 1, and the second part 52 extends along the axial direction of the rotating shaft 1 toward the side adjacent to the first sealing assembly 3, the free end of the first part 51 abuts against the outer circumferential surface of the rotating shaft 1 and the side of the first part 51 facing the bearing 22 is spaced apart from the bearing 22 along the axial direction of the rotating shaft 1, and the free end of the second part 52 abuts against the outer ring of the bearing 22.

[0046] Specifically, Figure 1 As shown, the third sealing component 5 has a first part 51 and a second part 52 connected to each other along the inner-outer direction, the first part 51 is a sleeve extending along the inner-outer direction, the second part 52 is a sleeve extending along the left-right direction and the left end of the second part 52 is connected to the outer circumferential surface of the first part 51, the inner circumferential surface of the first part 51 is the inner circumferential surface of the third sealing component 5 and the inner circumferential surface of the first part 51 is against the outer circumferential surface of the rotating shaft 1, the right end surface of the second part 52 is the outer circumferential surface of the third sealing component 5 and the right end surface of the second part 52 is against the outer ring of the bearing 22, the left end of the first part 51 is spaced apart from the bearing 22 along the left-right direction, while ensuring the sealing performance, the wear between the first part 51 and the bearing 22 can be prevented, so that the setting of the third sealing component 5 is more reasonable.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A low resistance roller device, characterized in that: include: A roller, the roller includes a drum and a rotating shaft, the drum is inserted on the rotating shaft; a bearing seat, the bearing seat includes a shell with an opening and a bearing arranged in the shell, one end of the rotating shaft passes through the opening and is inserted on the bearing, so that the rotating shaft is supported in the shell through the bearing; a first sealing component, the first sealing component is arranged in the shell and inserted on the rotating shaft, the first sealing component is located on a side of the bearing adjacent to the opening, the inner circumferential surface of the first sealing component and the outer circumferential surface of the rotating shaft are arranged at intervals along the radial direction of the rotating shaft and are filled with magnetic liquid, the first sealing component can generate a magnetic field, so as to adsorb the magnetic liquid between the rotating shaft and the first sealing component to seal the opening.

2. The low resistance roller device according to claim 1, characterized in that: The first sealing assembly comprises: A plurality of pole shoes, the plurality of pole shoes are arranged in the housing and sleeved on the rotating shaft, the inner circumferences of the plurality of pole shoes and the outer circumference of the rotating shaft are spaced apart along the radial direction of the rotating shaft and are filled with magnetic liquid; A permanent magnet is disposed in the housing and surrounds the outer circumference of the rotating shaft, and the permanent magnet is located between adjacent pole shoes.

3. The low resistance roller device according to claim 2, characterized in that: The first sealing assembly also includes a plurality of first sealing rings, at least one of which is sleeved on the outer circumferential surface of the pole shoe and located between the pole shoe and the housing, so that the first sealing ring seals the pole shoe and the housing.

4. The low resistance roller device according to claim 2, characterized in that: It also includes a magnetic isolation ring, which is arranged in the housing and located between the bearing and the first sealing assembly.

5. The low resistance roller device according to claim 2, characterized in that: It also includes a retaining ring with a magnetic isolation function, which is arranged in the shell and located on a side of the first sealing component adjacent to the opening.

6. The low resistance roller device according to claim 2, characterized in that: The inner circumference of the pole shoe is provided with a plurality of pole teeth, the plurality of pole teeth are spaced apart along the axial direction of the rotating shaft, the pole teeth and the outer circumference of the rotating shaft are spaced apart along the radial direction of the rotating shaft, and the magnetic liquid is filled between the pole teeth and the rotating shaft.

7. The low resistance roller device according to claim 1, characterized in that: It also includes a protective cover, which is sleeved on the rotating shaft and at least part of which is located in the opening. The protective cover is used to prevent dust or water from flowing into the shell.

8. The low resistance roller device according to claim 7, characterized in that: The protective cover and the first sealing assembly are spaced apart from each other along the axial direction of the rotating shaft.

9. The low resistance roller device according to any one of claims 1 to 8, characterized in that: It also includes a second sealing component, which is sleeved on the rotating shaft and located in the housing. The second sealing component is arranged on a side of the bearing away from the first sealing component. The inner circumference of the second sealing component and the outer circumference of the rotating shaft are arranged at intervals along the radial direction of the rotating shaft and are filled with the magnetic liquid. The second sealing component can generate a magnetic field so as to adsorb the magnetic liquid between the rotating shaft and the second sealing component to seal the bearing.

10. The low resistance roller device according to any one of claims 1 to 8, characterized in that: It also includes a third sealing component, which is sleeved on the rotating shaft and located in the housing. The third sealing component is arranged on a side of the bearing away from the first sealing component so that the third sealing component can seal the bearing. The third sealing component can be a non-contact labyrinth sealing component or a contact lip sealing component.

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