Roller units and belt conveyors

Abstract

The present invention discloses a roller device and a belt conveyor. The roller device includes a rotating member, a mounting seat, a bearing, a sealing assembly, and a first permanent magnet. The bearing is provided with lubricating fluid and is disposed within a mounting cavity. One end of the rotating member extends through an opening and extends within the bearing. The sealing assembly includes a sealing unit and magnetic fluid. The sealing unit is disposed within the mounting seat and extends through the rotating member. The sealing unit is located on a side of the bearing adjacent to the opening, and the inner circumference of the sealing unit and the outer circumference of the rotating member are spaced apart in an inner-outer direction to form a first gap. The magnetic fluid fills the first gap. The first permanent magnet is disposed within the mounting cavity and located between the sealing assembly and the bearing. The first permanent magnet is connected to the sealing assembly. The first permanent magnet extends through the rotating member, and the inner circumference of the first permanent magnet and the outer circumference of the rotating member are spaced apart to form a second gap. The roller device of the present invention has the advantages of a simple structure and a long service life.

Description

Technical Field

[0001] The present invention relates to the field of mining machinery, and in particular to a roller device and a belt conveyor. Background Art

[0002] In belt conveyor systems in industries like mining and coal mining, the roller, as a crucial component of the conveyor, often needs to operate for extended periods in harsh environments. The roller's sealing structure is crucial for ensuring proper operation, reducing frictional losses, and preventing lubricant leakage.

[0003] In the related art, the drum sealing structure has disadvantages such as low sealing efficiency, high maintenance cost, and complex structure. Summary of the Invention

[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0005] Conventional seals are prone to lubricant leakage, leading to increased maintenance costs, environmental pollution, and safety hazards. While emerging magnetic fluid seals can achieve "zero leakage," they face technical bottlenecks in liquid-liquid interface stability. Existing improvements improve sealing by adding a gas barrier, but this comes with structural complexity and increased costs.

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, an embodiment of the present invention provides a roller device with high sealing efficiency and simple structure.

[0008] The embodiment of the present invention provides a belt conveyor with long service life and low cost.

[0009] The roller device according to an embodiment of the present invention is characterized in that it includes: a rotating member; a mounting seat and a bearing, the mounting seat has an opening and a mounting cavity that are connected to each other, a lubricating liquid is provided in the bearing and the bearing is arranged in the mounting cavity, one end of the rotating member passes through the opening and is inserted into the bearing, so that the rotating member rotates in the mounting seat through the bearing; a sealing assembly, the sealing assembly includes a sealing unit and a magnetic liquid, the sealing unit is arranged in the mounting seat and inserted on the rotating member, the sealing unit is located on a side of the bearing adjacent to the opening, and the inner circumferential surface of the sealing unit and the outer circumferential surface of the rotating member are spaced apart in the inner and outer directions to form a first gap, the magnetic liquid is filled in the a first permanent magnet disposed in the mounting cavity and between the sealing assembly and the bearing; and a first permanent magnet connected to the sealing assembly so that the first permanent magnet magnetizes the sealing unit to increase the magnetic field strength between the sealing unit and the rotating member. The first permanent magnet is passed through the rotating member and the inner circumference of the first permanent magnet is spaced from the outer circumference of the rotating member to form a second gap. The spacing of the first gap is equal to the spacing of the second gap, so that when the lubricating liquid in the bearing flows into the second gap, the first permanent magnet can reduce the speed difference between the magnetic liquid and the lubricating liquid.

[0010] The roller device of the embodiment of the present invention is provided with a sealing assembly and a first permanent magnet, which can seal the bearing to prevent leakage of the lubricating liquid in the bearing, reduce environmental pollution and safety hazards, increase the service life of the roller device, and also improve the stability of the magnetic liquid interface, thereby extending the service life of the sealing structure.

[0011] In some embodiments, the roller device also includes a second permanent magnet, which is inserted into the rotating part and the inner circumference of the second permanent magnet is spaced from the outer circumference of the rotating part to form a third gap, so that the magnetic liquid and the lubricating liquid form an air layer between the third gap. The second permanent magnet is located between the sealing assembly and the first permanent magnet and the two ends of the second permanent magnet are respectively connected to the first permanent magnet and the sealing assembly, so that the second permanent magnet magnetizes the sealing unit to increase the magnetic field strength between the sealing unit and the rotating part.

[0012] In some embodiments, the first permanent magnet and the second permanent magnet are integrally formed, the spacing of the third gap is greater than the spacing of the second gap and the difference between the third gap and the second gap is 0.01 mm-1 mm, and / or the polarity of the magnetic pole of the first permanent magnet on the side away from the rotating part is the same as the polarity of the magnetic pole of the second permanent magnet on the side away from the rotating part.

[0013] In some embodiments, the roller device further includes magnetic particles filled in at least one of the second gap and the third gap, and the lubricating liquid in the bearing can be mixed with the magnetic particles to form the magnetic liquid so as to replenish the sealing assembly with the magnetic liquid.

[0014] In some embodiments, the drum device further includes a magnetic isolation ring, which is sleeved on the rotating member and located between the bearing and the first permanent magnet. The inner circumference of the magnetic isolation ring is spaced apart from the outer circumference of the rotating member.

[0015] In some embodiments, the sealing unit includes: a plurality of pole shoes, the plurality of pole shoes are arranged in the mounting seat and sleeved on the rotating member, a plurality of pole teeth are arranged at intervals along the length direction of the rotating member on the inner circumferential surface of the pole shoe, the rotating member and the plurality of pole teeth are spaced apart along the inner and outer directions to form the first gap; a third permanent magnet, the third permanent magnet is arranged in the mounting seat and sleeved on the rotating member, the permanent magnet is arranged between two adjacent pole shoes, the polarity of the side of the third permanent magnet adjacent to the first permanent magnet is the same as the polarity of the pole of the first permanent magnet on the side away from the rotating member.

[0016] In some embodiments, the drum device also includes a magnetic ring, which is arranged in the mounting seat and sleeved on the outer peripheral side of the first permanent magnet. One end of the magnetic ring is connected to the sealing unit so that the first permanent magnet magnetizes the sealing assembly through the magnetic ring.

[0017] In some embodiments, the sealing unit is provided with a channel running through the sealing unit in the inward and outward directions, one end of the channel is connected to the first gap, and the other end of the channel is suitable for passing magnetic liquid so that the magnetic liquid flows into the first gap through the channel.

[0018] In some embodiments, the drum device further includes a blocking member, which is disposed in the channel to block the channel.

[0019] The belt conveyor of the embodiment of the present invention includes: a roller device, which is the roller device of any one of the above embodiments; and a conveyor belt, which is passed through the roller device so that the roller device drives the conveyor belt to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a schematic structural diagram of a roller device according to an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 A partial enlarged view of middle A.

[0022] Roller device 100; rotating member 1; mounting seat 2; bearing 3; sealing assembly 4; sealing unit 41; first pole shoe 411; second pole shoe 412; magnetic fluid 42; third permanent magnet 43; first permanent magnet 5; second permanent magnet 6; magnetic particles 7; magnetic conductive ring 8; magnetic isolation ring 9. DETAILED DESCRIPTION

[0023] 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 should not be understood as limiting the present invention.

[0024] Hereinafter, a drum device 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0025] like Figure 1-2 As shown, the drum device 100 according to the embodiment of the present invention includes a rotating member 1 , a mounting seat 2 , a bearing 3 , a sealing assembly 4 and a first permanent magnet 5 .

[0026] The mounting seat 2 has an opening and a mounting cavity that are connected to each other. Lubricating liquid is provided in the bearing 3 and the bearing 3 is arranged in the mounting cavity. One end of the rotating member 1 passes through the opening and is arranged in the bearing 3, so that the rotating member 1 rotates in the mounting seat 2 through the bearing 3. Specifically, Figure 1-2 As shown, the mounting seat 2 can be a bearing 3 seat with an opening facing left, and the rotating part 1 includes a rotating shaft. The outer ring of the bearing 3 is fixed in the mounting cavity of the mounting seat 2, and the rotating shaft passes through the opening and is arranged in the inner ring of the bearing 3 seat, so that the rotating shaft rotates in the mounting seat 2 through the bearing 3.

[0027] The sealing assembly 4 includes a sealing unit 41 and a magnetic fluid 42. The sealing unit 41 is arranged in the mounting seat 2 and penetrates the rotating member 1. The sealing unit 41 is located on the side of the bearing 3 adjacent to the opening. The inner circumference of the sealing unit 41 and the outer circumference of the rotating member 1 are spaced apart in the inner and outer directions to form a first gap. The magnetic fluid 42 is filled in the first gap so that the sealing assembly 4 can seal the bearing 3. Specifically, as shown in FIG. Figure 1-2 As shown, the sealing unit 41 is provided on the rotating part 1 and is located at the left end of the bearing 3. The inner circumference of the sealing unit 41 and the outer circumference of the rotating shaft are spaced apart to form a first gap. The magnetic liquid 42 is adsorbed between the sealing unit 41 and the rotating shaft, thereby preventing the lubricating liquid in the bearing 3 from leaking and blocking external impurities from entering the interior of the bearing 3, thereby ensuring the service life of the bearing 3.

[0028] The first permanent magnet 5 is arranged in the installation cavity and is located between the sealing component 4 and the bearing 3. The first permanent magnet 5 is connected to the sealing component 4 so that the first permanent magnet 5 magnetizes the sealing unit 41 to increase the magnetic field strength between the sealing unit 41 and the rotating part 1. The first permanent magnet 5 is passed through the rotating part 1 and the inner circumference of the first permanent magnet 5 is spaced apart from the outer circumference of the rotating part 1 to form a second gap. The spacing of the first gap is equal to the spacing of the second gap, so that when the lubricating liquid in the bearing 3 flows into the second gap, the first permanent magnet 5 can reduce the speed difference between the magnetic liquid 42 and the lubricating liquid. Specifically, as Figure 1-2 As shown, the first permanent magnet 5 is arranged in the mounting seat 2 and penetrates the rotating part 1. The first permanent magnet 5 is arranged between the sealing assembly 4 and the bearing 3 and is connected to the sealing unit 41, so that the first permanent magnet 5 magnetizes the sealing unit 41 to increase the magnetic field strength between the sealing unit 41 and the rotating part 1, thereby improving the sealing performance and stability of the sealing assembly 4. The first permanent magnet 5 penetrates the rotating part 1 and the inner circumference of the first permanent magnet 5 and the outer circumference of the rotating part 1 are spaced apart to form a second gap. Since the bearing 3 rotates at high speed along with the rotating member 1, the lubricating liquid in the bearing 3 flows into the second gap, and the rotating member 1 rotates, the first permanent magnet 5 and the sealing unit 41 are both stationary, and the spacing of the first gap is equal to the spacing of the second gap (in other words, the spacing between the inner circumference of the sealing unit 41 and the outer circumference of the rotating member 1 is equal to the spacing between the inner circumference of the first permanent magnet 5 and the outer circumference of the rotating member 1). Therefore, the rotational speed difference between the magnetic liquid 42 in the first gap and the rotational speed of the lubricating liquid in the second gap can be reduced, thereby extending the service life of the sealing unit 41. In addition, the provision of the first permanent magnet 5 reduces the contact area between the magnetic liquid 42 and the lubricated liquid, thereby extending the service life of the sealing assembly 4.

[0029] The roller device 100 of the embodiment of the present invention is provided with a sealing assembly 4 and a first permanent magnet 5. The sealing assembly 4 is used to seal the bearing 3 to prevent leakage of the lubricating liquid in the bearing 3, reduce environmental pollution and safety hazards, and extend the service life of the equipment. The first permanent magnet 5 can magnetize the sealing assembly 4 to improve the sealing efficiency and sealing performance of the sealing assembly 4. In addition, the first permanent magnet 5 can effectively reduce the speed difference between the magnetic liquid 42 and the lubricating liquid, improve the interface stability of the magnetic liquid 42, and extend the service life of the sealing structure.

[0030] In some embodiments, the drum device 100 further includes a second permanent magnet 6, which is disposed on the rotating member 1 and the inner circumference of the second permanent magnet 6 is spaced from the outer circumference of the rotating member 1 to form a third gap, so that the magnetic liquid 42 and the lubricating liquid form an air layer between the third gap. The second permanent magnet 6 is located between the sealing assembly 4 and the first permanent magnet 5, and the two ends of the second permanent magnet 6 are respectively connected to the first permanent magnet 5 and the sealing assembly 4, so that the second permanent magnet 6 magnetizes the sealing unit 41 to increase the magnetic field strength between the sealing unit 41 and the rotating member 1. Specifically, as Figure 1-2 As shown, the second permanent magnet 6 is arranged in the installation cavity and is located between the sealing component 4 and the first permanent magnet 5. The left and right ends of the second permanent magnet 6 are respectively in contact with the sealing component 4 and the first permanent magnet 5, so that the second permanent magnet 6 magnetizes the sealing component 4, thereby improving the sealing performance of the sealing component 4. The inner circumference of the second permanent magnet 6 is spaced from the outer circumference of the rotating part 1 to form a third gap. The magnetic liquid 42 in the first gap seals the first gap, and the lubricating liquid in the second gap seals the second gap, so that air is sealed in the third gap to form an air layer in the third gap, thereby preventing the lubricating liquid from flowing into the magnetic liquid 42, achieving effective isolation between the magnetic liquid 42 and the lubricating liquid, and preventing the two liquids from mixing.

[0031] In some embodiments, the first permanent magnet 5 and the second permanent magnet 6 are integrally formed. Figure 1-2 As shown, the first permanent magnet 5 and the second permanent magnet 6 can be provided in a separate manner or in an integrally formed manner. The separate arrangement facilitates flexible adjustment of the relative position and gap between the first permanent magnet 5 and the second permanent magnet 6. The first permanent magnet 5 and the second permanent magnet 6 can also be replaced according to the magnetization requirements of the sealing assembly 4 to ensure the sealing performance of the sealing assembly 4. The integrally formed design reduces assembly steps, reduces performance deviations caused by assembly errors, and at the same time enhances the integrity and durability of the structure, thereby extending its service life.

[0032] In some embodiments, the spacing of the third gap is greater than the spacing of the second gap and the difference between the third gap and the second gap is 0.01mm-1mm. Figure 1-2 As shown, the distance between the inner circumference of the second permanent magnet 6 and the outer circumference of the rotating part 1 is greater than the distance between the inner circumference of the first permanent magnet 5 and the outer circumference of the rotating part 1, and the distance of the third gap is greater than the distance of the second gap, and the difference between the third gap and the second gap can be any one of 0.01mm, 0.03mm, 0.06mm, 0.08mm, 0.09mm, 1mm, etc. If the difference in the distance is too small or too large, the air layer may not be able to exist stably, and the magnetic liquid 42 and the lubricating liquid cannot be effectively isolated, resulting in direct contact between the magnetic liquid 42 and the lubricating liquid, thereby mixing.

[0033] In some embodiments, the sealing unit 41 includes a plurality of pole pieces and a third permanent magnet 43 .

[0034] A plurality of pole shoes are arranged in the mounting seat 2 and sleeved on the rotating member 1. A plurality of pole teeth are arranged at intervals along the length direction of the rotating member 1 on the inner circumference of the pole shoe. The rotating member 1 and the plurality of pole teeth are arranged at intervals along the inner and outer directions to form a first gap. Specifically, Figure 1-2 As shown, the inner circumference of the pole shoe is provided with a plurality of pole teeth spaced apart in the left-right direction. The inner circumference of the pole teeth is spaced apart from the outer circumference of the rotating member 1 to form a first gap. The magnetic fluid 42 is adsorbed between the pole teeth and the rotating shaft.

[0035] The third permanent magnet 43 is arranged in the mounting seat 2 and is sleeved on the rotating member 1. The permanent magnet is arranged between two adjacent pole shoes. The polarity of the side of the third permanent magnet 43 adjacent to the first permanent magnet 5 is the same as the polarity of the magnetic pole of the side of the first permanent magnet 5 away from the rotating member 1. Specifically, Figure 1-2 As shown, the plurality of pole shoes include a first pole shoe 411 and a second pole shoe 412, and the first pole shoe 411 and the second pole shoe 412 are spaced apart in the left-right direction, the third permanent magnet 43 is located between the first pole shoe 411 and the second pole shoe 412, and the two ends of the third permanent magnet 43 are respectively attached to the first pole shoe 411 and the second pole shoe 412, and the first pole shoe 411 is located between the second permanent magnet 6 and the third permanent magnet 43. A closed magnetic circuit is formed by the third permanent magnet 43, the first pole shoe 411, the second pole shoe 412 and the rotating member 1. The magnetic energy in the third permanent magnet 43 is used to generate a strong and weak alternating non-uniform magnetic field in the gap between the rotating member 1 and the pole teeth, thereby turning the magnetic liquid 4 2 is adsorbed between the pole teeth and the rotating member 1, forming a sealing ring of magnetic liquid 42, thereby blocking the gap between the pole shoe and the shaft, thereby achieving the purpose of sealing. In addition, the polarity of the right magnetic pole of the third permanent magnet 43 is the same as the polarity of the outer ring magnetic pole of the first permanent magnet 5. For example, the polarity of the right magnetic pole of the third permanent magnet 43 and the polarity of the outer ring magnetic pole of the first permanent magnet 5 are both N poles, or the polarity of the right magnetic pole of the third permanent magnet 43 and the polarity of the outer ring magnetic pole of the first permanent magnet 5 are both S poles. As a result, the third permanent magnet 43 and the first permanent magnet 5 simultaneously magnetize the first pole shoe 411, thereby increasing the magnetic field strength between the first pole shoe 411 and the rotating member 1.

[0036] In some embodiments, the roller device 100 further includes magnetic particles 7, which are filled in at least one of the second gap and the third gap. The lubricating liquid in the bearing 3 can be mixed with the magnetic particles 7 to form a magnetic liquid 42, so as to replenish the magnetic liquid 42 to the sealing component 4. Specifically, Figure 1-2As shown, the magnetic particles 7 are adsorbed in the second and third gaps by the first and second permanent magnets 5, 6, achieving a magnetic powder seal. When the rotating member 1 drives the bearing 3 to rotate at high speed, the lubricating liquid flows out of the bearing 3 and into the magnetic particles 7 to mix with the magnetic particles 7. The heat generated by the continuous operation of the bearing 3 and the heat generated by the friction between the magnetic particles 7, the first and second permanent magnets 5, 6, and the rotating member 1 provide an environment for the preparation of the magnetic liquid 42. Therefore, the magnetic particles 7 react with the lubricating liquid to form the magnetic liquid 42. Since the first, second, and third permanent magnets 5, 6, 43 all magnetize the first pole piece 411, the magnetic field strength generated by the first pole piece 411 in the first gap is greater than the magnetic field strength generated by the first and second permanent magnets 5, 6 in the second and third gaps. The magnetic liquid 42 prepared by the magnetic particles 7 is also fluid, allowing it to flow into the first gap between the first pole piece 411 and the rotating member 1 under the action of the magnetic field strength, further improving the life of the sealing structure.

[0037] In some embodiments, the drum device 100 further includes a magnetic isolation ring 9, which is sleeved on the rotating member 1 and located between the bearing 3 and the first permanent magnet 5. The inner circumference of the magnetic isolation ring 9 is spaced apart from the outer circumference of the rotating member 1. Specifically, Figure 1-2 As shown, the magnetic isolation ring 9 is made of non-magnetic material, is arranged in the mounting seat 2 and is sleeved on the rotating part 1, and is arranged between the bearing 3 and the first permanent magnet 5. The two ends of the magnetic isolation ring 9 are respectively fitted with the bearing 3 and the first permanent magnet 5. The magnetic isolation ring 9 blocks the magnetic field generated by the first permanent magnet 5 from diffusing toward the bearing 3, ensuring that the magnetic field of the first permanent magnet 5 is concentrated on the sealing unit 41, thereby improving the sealing performance.

[0038] In some embodiments, the drum device 100 further includes a magnetic ring 8, which is disposed in the mounting base 2 and sleeved on the outer periphery of the first permanent magnet 5. One end of the magnetic ring 8 is connected to the sealing unit 41 so that the first permanent magnet 5 can magnetize the sealing assembly 4 through the magnetic ring 8. Specifically, Figure 1-2 As shown, the magnetic ring 8 is made of magnetic material, is arranged in the mounting seat 2 and is sleeved on the rotating part 1, and is sleeved on the outer peripheral side of the first permanent magnet 5 and the second permanent magnet 6. The left and right ends of the magnetic ring 8 are respectively fitted with the first pole shoe 411 and the magnetic isolation ring 9. The magnetic field generated by the first permanent magnet 5 and the second permanent magnet 6 is concentratedly guided to the sealing unit 41 through the magnetic ring 8 to avoid the loss of the magnetic field and improve the utilization rate of the magnetic field, so that the sealing unit 41 can obtain a stronger magnetization effect, thereby improving the sealing performance.

[0039] In some embodiments, the polarity of the magnetic pole of the first permanent magnet 5 away from the rotating member 1 is the same as the polarity of the magnetic pole of the second permanent magnet 6 away from the rotating member 1. Figure 1As shown, the first permanent magnet 5 and the second permanent magnet 6 are both annular and both are radiation magnetized. The polarity of the outer ring of the first permanent magnet 5 is the same as the polarity of the outer ring of the second permanent magnet 6. For example, the polarity of the outer ring of the first permanent magnet 5 and the polarity of the outer ring of the second permanent magnet 6 are both N poles, or the polarity of the outer ring of the first permanent magnet 5 and the polarity of the outer ring of the second permanent magnet 6 are both S poles. The outer ring of the first permanent magnet 5 and the outer ring of the second permanent magnet 6 are both in contact with the inner ring of the magnetic ring 8. Therefore, the first permanent magnet 5 and the second permanent magnet 6 are magnetized to the sealing unit 41 through the magnetic ring 8. Since the polarity of the outer ring of the first permanent magnet 5 and the polarity of the outer ring of the second permanent magnet 6 are the same, the first permanent magnet 5 is prevented from magnetizing the second permanent magnet 6, or the second permanent magnet 6 is prevented from magnetizing the first permanent magnet 5, thereby ensuring the magnetization effect of the sealing unit 41.

[0040] In some embodiments, the sealing unit 41 is provided with a channel (not shown) extending through the sealing unit 41 in an inward-outward direction. One end of the channel is connected to the first gap, and the other end of the channel is adapted to allow the magnetic liquid 42 to flow through the channel into the first gap. Specifically, the first pole piece 411 or the second pole piece 412 is provided with a channel extending through the first pole piece 411 or the second pole piece 412 in an inward-outward direction. The outlet of the channel is connected to the first gap, and the inlet of the channel is adapted to allow the magnetic liquid 42 to flow. By providing a flow path for the magnetic liquid 42, dynamic replenishment and uniform distribution of the magnetic liquid 42 are achieved, thereby improving the sealing performance and overall energy efficiency of the device and extending the service life of the drum device 100.

[0041] In some embodiments, the drum device 100 further includes a sealing member (not shown) disposed within the channel to seal the channel. Specifically, the sealing member may be a rubber sealing cap that can be inserted into the channel inlet to seal the channel, allowing the drum device 100 to function normally. Alternatively, the sealing member can be removed to facilitate adding magnetic fluid 42 to the sealing assembly 4.

[0042] The roller device 100 of the embodiment of the present invention is provided with a sealing component 4 to effectively prevent oil leakage. The design of the first permanent magnet 5 can effectively reduce the speed difference and contact area between the magnetic liquid 42 and the sealed liquid. Moreover, the cavity between the second permanent magnet 6 and the pole shoe can form an air layer to prevent direct contact between the magnetic liquid 42 and the sealed liquid. The structure can also self-replenish the magnetic fluid, and the design of the first permanent magnet 5 and the second permanent magnet 6 can enhance the magnetic field strength in the sealing gap. The device solves the problem of lubricating oil leakage in the traditional sealing method of the roller and improves the service life of the roller.

[0043] The belt conveyor includes a roller device 100 and a conveyor belt (not shown in the figure).

[0044] The roller device 100 is any of the roller devices 100 described in the above embodiments. The conveyor belt is threaded through the roller device 100 so that the roller device 100 drives the conveyor belt to rotate. Thus, the rotating member 1 (e.g., the rotating shaft and the rotating drum) of the roller device 100 is supported within the mounting base 2 via the bearing 3. The roller device 100 is installed below or above the conveyor belt to provide stable support for the conveyor belt and the material it carries, preventing the conveyor belt from sagging or deformation, and ensuring that the material can move smoothly and steadily along the conveyor belt.

[0045] The belt conveyor of the embodiment of the present invention has the advantages of simple structure, long service life, etc.

[0046] 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 to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] 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.

[0050] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A roller device, characterized in that: include: rotating parts; A mounting seat and a bearing, wherein the mounting seat has an opening and a mounting cavity communicating with each other, a lubricating liquid is provided in the bearing and the bearing is disposed in the mounting cavity, and one end of the rotating member passes through the opening and is disposed in the bearing, so that the rotating member rotates in the mounting seat via the bearing; a sealing assembly, the sealing assembly comprising a sealing unit and a magnetic liquid, the sealing unit being disposed within the mounting seat and passing through the rotating member, the sealing unit being located on a side of the bearing adjacent to the opening, the inner circumferential surface of the sealing unit and the outer circumferential surface of the rotating member being spaced apart in an inner-outer direction to form a first gap, the magnetic liquid being filled in the first gap so that the sealing assembly seals the bearing; A first permanent magnet is disposed in the mounting cavity and between the sealing assembly and the bearing. The first permanent magnet is connected to the sealing assembly so that the first permanent magnet magnetizes the sealing unit to increase the magnetic field strength between the sealing unit and the rotating member. The first permanent magnet is passed through the rotating member and the inner circumference of the first permanent magnet is spaced apart from the outer circumference of the rotating member to form a second gap. The spacing of the first gap is equal to the spacing of the second gap. When the lubricating liquid in the bearing flows into the second gap, the first permanent magnet can reduce the speed difference between the magnetic liquid and the lubricating liquid.

2. The roller device according to claim 1, characterized in that It also includes a second permanent magnet, which is arranged on the rotating part and the inner circumference of the second permanent magnet is spaced from the outer circumference of the rotating part to form a third gap, so that the magnetic liquid and the lubricating liquid form an air layer between the third gap. The second permanent magnet is located between the sealing assembly and the first permanent magnet, and the two ends of the second permanent magnet are respectively connected to the first permanent magnet and the sealing assembly, so that the second permanent magnet magnetizes the sealing unit to increase the magnetic field strength between the sealing unit and the rotating part.

3. The roller device according to claim 2, characterized in that The first permanent magnet and the second permanent magnet are integrally formed, the spacing of the third gap is greater than the spacing of the second gap and the difference between the third gap and the second gap is 0.01mm-1mm, and / or the polarity of the magnetic pole of the first permanent magnet on the side away from the rotating part is the same as the polarity of the magnetic pole of the second permanent magnet on the side away from the rotating part.

4. The roller device according to claim 2, characterized in that The bearing further comprises magnetic particles filled in at least one of the second gap and the third gap. The lubricating liquid in the bearing can be mixed with the magnetic particles to form the magnetic liquid, so as to replenish the magnetic liquid for the sealing assembly.

5. The roller device according to claim 1, characterized in that It also includes a magnetic isolation ring, which is sleeved on the rotating part and located between the bearing and the first permanent magnet. The inner circumference of the magnetic isolation ring is spaced apart from the outer circumference of the rotating part.

6. The roller device according to claim 1, characterized in that The sealing unit comprises: a plurality of pole shoes, the plurality of pole shoes being disposed in the mounting seat and sleeved on the rotating member, the inner circumferential surface of the pole shoe being provided with a plurality of pole teeth spaced apart along the length direction of the rotating member, the rotating member and the plurality of pole teeth being spaced apart along the inner and outer directions to form the first gap; A third permanent magnet is arranged in the mounting seat and sleeved on the rotating member, and the permanent magnet is arranged between two adjacent pole shoes. The polarity of the side of the third permanent magnet adjacent to the first permanent magnet is the same as the polarity of the magnetic pole of the side of the first permanent magnet away from the rotating member.

7. The drum device according to claim 1, characterized in that It also includes a magnetic ring, which is arranged in the mounting seat and sleeved on the outer circumference of the first permanent magnet. One end of the magnetic ring is connected to the sealing unit so that the first permanent magnet can magnetize the sealing assembly through the magnetic ring.

8. The drum device according to claim 1, characterized in that The sealing unit is provided with a channel running through the sealing unit in the inward and outward directions. One end of the channel is connected to the first gap, and the other end of the channel is suitable for introducing magnetic liquid so that the magnetic liquid flows into the first gap through the channel.

9. The drum device according to claim 8, characterized in that It also includes a blocking piece, which is arranged in the channel to block the channel.

10. A belt conveyor, characterized in that: include: A roller device, wherein the roller device is the roller device according to any one of claims 1 to 9; A conveyor belt is passed through the roller device so that the roller device drives the conveyor belt to rotate.

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