Electromagnetic suspension type roller for belt conveyor and belt conveyor

Abstract

The invention provides an electromagnetic suspension type roller for a belt conveyor and the belt conveyor, and belongs to the technical field of mining machine.The electromagnetic suspension type roller for the belt conveyor comprises a roller body, a roller shaft and two sets of magnetic suspension assemblies, the roller shaft penetrates through the roller body, and the two sets of magnetic suspension assemblies are located between the two ends of the roller body and the two ends of the roller shaft respectively; the magnetic suspension assembly comprises an electromagnetic coil and a permanent magnet coil, the electromagnetic coil is arranged on the roller shaft in a sleeving mode, the permanent magnet coil is arranged in the roller body and located between the roller body and the electromagnetic coil, a gap is formed between the electromagnetic coil and the permanent magnet coil, and the electrified electromagnetic coil and the permanent magnet coil are supported in a suspended mode; the suspension supporting force between the electromagnetic coil and the permanent magnet coil is controlled by adjusting the magnitude of the current to ensure that the electromagnetic coil does not make contact with the permanent magnet coil, the larger the current introduced into the electromagnetic coil is, the stronger the magnetic force of the electromagnetic coil is, and the larger the suspension supporting force between the electromagnetic coil and the permanent magnet coil is. And mechanical wear caused by contact between the electromagnetic coil and the permanent magnet ring is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of mining machinery, and particularly relates to an electromagnetic suspension drum for a belt conveyor and a belt conveyor. Background Art

[0002] Belt conveyors are widely used in the field of mining machinery to transport bulk materials. As a key component of a belt conveyor, the operating state of the drum directly affects the conveying efficiency, energy consumption, and maintenance cost of the belt conveyor. However, there are still technical bottlenecks in existing drums, and optimization and improvement are urgently needed.

[0003] For example, the Chinese utility model patent with the application number "CN200620165109.1" discloses a magnetic suspension drum bearing, which includes a core shaft, a shaft sleeve, a permanent magnet inner ring, and a permanent magnet outer ring; a pair of permanent magnet inner rings in the shape of frustum cones with opposite cone surface directions are fixed on the core shaft, and the permanent magnet outer ring surrounding the outside of the permanent magnet inner ring and magnetically cooperating with the permanent magnet inner ring is fixed on the inner wall of the shaft sleeve. When the magnetic suspension drum bearing described in the above technical solution is applied to a belt conveyor, since the types of materials transported by the same belt conveyor will change. For example, in coal mining production in coal mines, due to the existence of coal seams and coal gangue layers, the belt conveyor needs to separately transport coal and coal gangue. If the initial magnetic force between the permanent magnet inner ring and the permanent magnet outer ring is set to adapt to the weight of coal, when transporting coal gangue, since the weight of coal gangue is greater than that of coal, it may cause insufficient suspension support force between the permanent magnet inner ring and the permanent magnet outer ring, and there will also be a magnetic force attenuation situation for the permanent magnet inner ring or the permanent magnet outer ring, resulting in contact between the core shaft installed with the permanent magnet inner ring and the shaft sleeve installed with the permanent magnet outer ring, causing mechanical wear between the core shaft and the shaft sleeve during the operation of the drum bearing, and reducing the service life of the drum bearing. Summary of the Invention

[0004] In view of this, it is necessary to provide an electromagnetic suspension drum for a belt conveyor to ensure that the magnetized core shaft and the magnetized shaft sleeve do not come into contact, and avoid mechanical wear between the core shaft and the shaft sleeve; It is also necessary to provide a belt conveyor.

[0005] On the one hand, an electromagnetic suspension drum for a belt conveyor provided by the present invention includes a cylinder body, a drum shaft, and two groups of magnetic suspension components. The drum shaft penetrates through the cylinder body. The two groups of magnetic suspension components are respectively located between the two ends of the cylinder body and the drum shaft. The magnetic suspension component includes an electromagnetic coil and a permanent magnetic ring. The electromagnetic coil is sleeved on the drum shaft. The permanent magnetic ring is arranged in the cylinder body, and the permanent magnetic ring is located between the cylinder body and the electromagnetic coil. There is a gap between the electromagnetic coil and the permanent magnetic ring. The cylinder body drives the permanent magnetic ring to rotate. The energized electromagnetic coil and the permanent magnetic ring are in a suspended support state, so as to control the suspended support force between the electromagnetic coil and the permanent magnetic ring by adjusting the magnitude of the current to ensure that the electromagnetic coil and the permanent magnetic ring do not come into contact.

[0006] On the other hand, the present invention also provides a belt conveyor, including the electromagnetic suspension drum for a belt conveyor described in the above aspect.

[0007] As can be seen from the above technical solutions, an electromagnetic suspension drum for a belt conveyor provided by the present invention includes a cylinder body, a drum shaft, and two groups of magnetic suspension components. The drum shaft penetrates through the cylinder body. The two groups of magnetic suspension components are respectively located between the two ends of the cylinder body and the drum shaft. The magnetic suspension component includes an electromagnetic coil and a permanent magnetic ring. The electromagnetic coil is sleeved on the drum shaft. The permanent magnetic ring is arranged in the cylinder body, and the permanent magnetic ring is located between the cylinder body and the electromagnetic coil. There is a gap between the electromagnetic coil and the permanent magnetic ring. The cylinder body drives the permanent magnetic ring to rotate. The energized electromagnetic coil and the permanent magnetic ring are in a suspended support state, so as to control the suspended support force between the electromagnetic coil and the permanent magnetic ring by adjusting the magnitude of the current to ensure that the electromagnetic coil and the permanent magnetic ring do not come into contact. The greater the current passed through the electromagnetic coil, the stronger the magnetic force of the electromagnetic coil, and the greater the suspended support force between the electromagnetic coil and the permanent magnetic ring. The smaller the current passed through the electromagnetic coil, the weaker the magnetic force of the electromagnetic coil, and the smaller the suspended support force between the electromagnetic coil and the permanent magnetic ring. This ensures that when the electromagnetic suspension drum for a belt conveyor conveys bulk materials of different weights, there is sufficient suspended support force between the electromagnetic coil and the permanent magnetic ring. At the same time, since the magnetic force of the electromagnetic coil is controlled by the current, the greater the current passed through the electromagnetic coil, the stronger the magnetic force of the electromagnetic coil, and the greater the suspended support force between the electromagnetic coil and the permanent magnetic ring, avoiding mechanical wear caused by contact between the electromagnetic coil and the permanent magnetic ring during the operation of the electromagnetic suspension drum for a belt conveyor due to the decrease in the suspended support force caused by the magnetic force attenuation of the permanent magnetic ring, thereby improving the service life of the electromagnetic suspension drum for a belt conveyor. Description of the Drawings

[0008] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0009] Figure 1 It is a cross-sectional view of an electromagnetic suspension drum for a belt conveyor provided by the present invention.

[0010] Figure 2 It is a cross-sectional view of the cylinder body in the present invention.

[0011] Figure 3 It is a cross-sectional view of the drum shaft in the present invention.

[0012] Figure 4 It is an exploded view of the electromagnetic coil protection assembly in the present invention.

[0013] Figure 5 It is an axonometric view of the outer sealing part in the present invention.

[0014] In the figure: electromagnetic suspension drum 10 for belt conveyor, cylinder body 110, first cavity 111, second cavity 112, third cavity 113, drum shaft 120, connection hole 121, first shaft body 122, second shaft body 123, annular groove 1231, magnetic suspension assembly 130, electromagnetic coil 131, permanent magnet ring 132, electromagnetic coil protection assembly 140, first through hole 141, snap ring 142, outer sealing part 143, second through hole 1431, outer retaining ring 1432, outer sealing cover 1433, sealing ring 1434, inner sealing part 144, inner sealing cover 1441, annular accommodation groove 14411, elastic retaining ring 1442, rubber ring 1443, power supply 20. Detailed implementation manners

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0016] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0017] Please refer toFigures 1-5 , on the one hand, an electromagnetic suspension drum 10 for a belt conveyor provided by the present invention includes a cylinder body 110, a drum shaft 120, and two sets of magnetic suspension components 130. Connection holes 121 are provided at both ends of the drum shaft 120. The drum shaft 120 passes through the cylinder body 110. The two sets of magnetic suspension components 130 are respectively located between the two ends of the cylinder body 110 and the drum shaft 120. The magnetic suspension component 130 includes an electromagnetic coil 131 and a permanent magnetic ring 132. The electromagnetic coil 131 and the permanent magnetic ring 132 have the same magnetic property. The electromagnetic coil 131 is sleeved on the drum shaft 120. The permanent magnetic ring 132 is arranged in the cylinder body 110, and the permanent magnetic ring 132 is located between the cylinder body 110 and the electromagnetic coil 131. There is a gap between the electromagnetic coil 131 and the permanent magnetic ring 132. The connecting wire of the electromagnetic coil 131 passes through the connection hole 121 and is connected to the power supply 20. The cylinder body 110 drives the permanent magnetic ring 132 to rotate. The energized electromagnetic coil 131 and the permanent magnetic ring 132 are in a suspended support state. By adjusting the magnitude of the current, the suspended support force between the electromagnetic coil 131 and the permanent magnetic ring 132 is ensured so that the electromagnetic coil 131 and the permanent magnetic ring 132 do not come into contact. The greater the current passed into the electromagnetic coil 131, the stronger the magnetic force of the electromagnetic coil 131, and the greater the suspended support force between the electromagnetic coil 131 and the permanent magnetic ring 132. The smaller the current passed into the electromagnetic coil 131, the weaker the magnetic force of the electromagnetic coil 131, and the smaller the suspended support force between the electromagnetic coil 131 and the permanent magnetic ring 132. This ensures that when the electromagnetic suspension drum 10 for a belt conveyor conveys bulk materials of different weights, there is sufficient suspended support force between the electromagnetic coil 131 and the permanent magnetic ring 132. At the same time, since the magnetic force of the electromagnetic coil 131 is controlled by current, the greater the current passed into the electromagnetic coil 131, the stronger the magnetic force of the electromagnetic coil 131, and the greater the suspended support force between the electromagnetic coil 131 and the permanent magnetic ring 132. This avoids mechanical wear caused by contact between the electromagnetic coil 131 and the permanent magnetic ring 132 during the operation of the electromagnetic suspension drum 10 for a belt conveyor due to the decrease in the suspended support force caused by the magnetic force attenuation of the permanent magnetic ring 132, thereby improving the service life of the electromagnetic suspension drum 10 for a belt conveyor.

[0018] In this application, the magnitude of the current passed into the electromagnetic coil 131 can be determined according to experiments. For example, when conveying coal gangue, gradually increase the current passed into the electromagnetic coil 131 and observe the operating state of the electromagnetic suspension drum 10 for a belt conveyor. When it is observed that the electromagnetic suspension drum 10 for a belt conveyor operates smoothly, the magnitude of the current at this time is the optimal threshold value, ensuring that there is sufficient suspended support force between the electromagnetic coil 131 and the permanent magnetic ring 132. Since the weight of coal gangue is greater than that of coal, after passing the above threshold current into the electromagnetic coil 131, the electromagnetic suspension drum 10 for a belt conveyor can convey both coal gangue and coal.

[0019] Further, to facilitate the assembly of the permanent magnet rings 132 to the cylinder 110, the cylinder 110 includes a first cavity 111 and two second cavities 112. The inner diameters of the two second cavities 112 are both larger than that of the first cavity 111, and the two second cavities 112 are respectively located at two ends of the first cavity 111. The two permanent magnet rings 132 are respectively located in the two second cavities 112, and the permanent magnet rings 132 and the second cavities 112 are in transition fit.

[0020] In the present application, the transition fit means that: the maximum limit dimension of the shaft is larger than the minimum limit dimension of the hole, the minimum limit dimension of the shaft is smaller than the maximum limit dimension of the hole, and the actual dimension of the shaft may be larger or smaller than the actual dimension of the hole, so that the tolerance zone of the hole and the tolerance zone of the shaft overlap with each other.

[0021] Further, to facilitate the assembly of the electromagnetic coils 131 to the drum shaft 120, the drum shaft 120 includes a first shaft body 122 and two second shaft bodies 123. The radii of the two second shaft bodies 123 are both smaller than that of the first shaft body 122, and the two second shaft bodies 123 are respectively located at two ends of the first shaft body 122. The length of the first shaft body 122 is the same as that of the first cavity 111, and the two electromagnetic coils 131 are respectively sleeved on the two second shaft bodies 123.

[0022] Further, to protect and fix the electromagnetic coils 131, the electromagnetic suspension drum 10 for a belt conveyor further includes two sets of electromagnetic coil protection assemblies 140. The middle parts of the two sets of electromagnetic coil protection assemblies 140 both have a first through hole 141. The two sets of electromagnetic coil protection assemblies 140 are both located in the cylinder 110, and the two sets of electromagnetic coil protection assemblies 140 are respectively located at the two open ends of the cylinder 110. The drum shaft 120 passes through the first through hole 141. One end of the electromagnetic coil 131 abuts against the first shaft body 122, and the other end of the electromagnetic coil 131 abuts against the electromagnetic coil protection assembly 140, so that the electromagnetic coil protection assembly 140 and the first shaft body 122 jointly fix the electromagnetic coil 131. At the same time, the electromagnetic coil protection assembly 140 and the cylinder 110 enclose a sealed space to ensure that the electromagnetic coils 131 are not eroded or worn by external substances, for example, the dust generated by the belt conveyor when conveying bulk materials.

[0023] Further, the cylinder body 110 further includes two third cavities 113. The inner diameters of the two third cavities 113 are both larger than those of the two second cavities 112, and the two third cavities 113 are respectively located at one end of the two second cavities 112 close to the opening of the cylinder body 110. The electromagnetic coil protection assembly 140 includes snap rings 142, an outer sealing portion 143, and an inner sealing portion 144. There are two snap rings 142. The numbers of the outer sealing portion 143 and the inner sealing portion 144 are the same as that of the snap rings 142. The middle of the inner sealing portion 144 has a first through hole 141, and the middle of the outer sealing portion 143 has a second through hole 1431. The snap rings 142 are located on one side of the permanent magnet ring 132 close to the opening of the cylinder body 110, and one end of the two snap rings 142 is in transitional fit with the two second cavities 112. The other ends of the two snap rings 142 respectively extend into the two third cavities 113. The two outer sealing portions 143 are respectively located in the two third cavities 113, and the outer sealing portion 143 is clamped between the snap ring 142 and the inner wall of the third cavity 113. The two inner sealing portions 144 are respectively arranged on the two second through holes 1431. The outer sealing portion 143 and the inner sealing portion 144 can rotate relative to each other and jointly form a sealed space with the cylinder body 110. When the electromagnetic suspension drum 10 for belt conveyors is applied to humid and high-dust environments such as mines or coal preparation plants, the contact area between the outer sealing portion 143 and dust and moisture is relatively large, so that most of the dust and moisture will first fall on the surface of the outer sealing portion 143, thereby forming a preliminary filtration of the dust and moisture. When the cylinder body 110 rotates, the outer sealing portion 143 will throw off the dust and moisture on its surface as the cylinder body 110 rotates, preventing excessive dust and moisture from falling onto the inner sealing portion 144 or the drum shaft 120. At the same time, the inner sealing portion 144 seals the outer peripheral surface of the drum shaft 120 to prevent the dust and moisture on the drum shaft 120 from entering the cylinder body 110.

[0024] Among them, the outer sealing part 143 includes an outer retaining ring 1432, an outer sealing cover 1433, and a sealing ring 1434. A second through hole 1431 is formed in the middle of the outer sealing cover 1433. The vertical cross-sections of the outer sealing cover 1433 and the sealing ring 1434 are both funnel-shaped. The outer retaining ring 1432 is clamped between the snap ring 142 and the inner wall of the third cavity 113. The outer sealing cover 1433 surrounds the inner circumferential surface of the outer retaining ring 1432. The sealing ring 1434 surrounds the second through hole 1431. The inner sealing part 144 is arranged on the sealing ring 1434. The outer retaining ring 1432 and the outer sealing cover 1433 are integrally formed. The outer sealing cover 1433 and the sealing ring 1434 are integrally formed. The sealing ring 1434 and the inner sealing part 144 can rotate relative to each other. Since the vertical cross-section of the outer sealing cover 1433 is funnel-shaped, its opening is large at the end close to the opening of the cylinder body 110 and small at the end close to the permanent magnet ring 132, showing a shrinking trend. On the one hand, the contact area between the outer sealing cover 1433 and dust and moisture is large. Most of the dust and moisture will be initially blocked by the outer sealing cover 1433 and cannot directly reach the contact position between the sealing ring 1434 and the inner sealing part 144. A small amount of dust or moisture is intercepted at the arc-shaped transition position between the outer sealing cover 1433 and the sealing ring 1434. When the cylinder body 110 rotates, the outer sealing cover 1433 will rotate with the cylinder body 110. The arc-shaped transition structure between the outer sealing cover 1433 and the sealing ring 1434 causes the dust or moisture intercepted therein to be shaken off and discharged, effectively blocking external substances from entering the sealed space surrounded by the electromagnetic coil protection component 140 and the cylinder body 110, avoiding erosion or wear of the electromagnetic coil 131 and the permanent magnet ring 132. In particular, it can effectively prevent water vapor from entering the sealed space surrounded by the electromagnetic coil protection component 140 and the cylinder body 110, avoiding the electromagnetic coil 131 from getting damp, which may affect the insulation performance and even cause short circuit or open circuit faults. On the other hand, the dust and moisture on the surface of the outer sealing cover 1433 gather and will not directly fall onto the inner sealing part 144 or the roller shaft 120. At the same time, since the vertical cross-section of the sealing ring 1434 is funnel-shaped, its opening is large at the end close to the opening of the cylinder body 110 and small at the end close to the permanent magnet ring 132, showing a shrinking trend, dust and moisture will not enter the inner sealing part 144. The outer sealing cover 1433 and the sealing ring 1434 are superimposed together to jointly prevent dust and moisture from entering the cylinder body 110 and protect the electromagnetic coil 131 and the permanent magnet ring 132.

[0025] Further, on the one hand, in order to enhance the sealing effect of the inner sealing portion 144 on the drum shaft 120, and on the other hand, in order to better fix the electromagnetic coil 131, annular grooves 1231 are formed on both of the two second shaft bodies 123, and the annular grooves 1231 are located on the side of the electromagnetic coil 131 close to the opening of the cylinder body 110. The inner sealing portion 144 includes an inner sealing cover 1441 and an elastic retaining ring 1442. A first through hole 141 is formed in the middle of the inner sealing cover 1441. The elastic retaining ring 1442 is adapted to the annular groove 1231. The inner sealing cover 1441 is covered on the sealing ring 1434, and the inner sealing cover 1441 and the sealing ring 1434 are in a transition fit, so that the inner sealing cover 1441 and the sealing ring 1434 can rotate relative to each other. The elastic retaining ring 1442 is located at one end of the first through hole 141 close to the electromagnetic coil 131. The elastic retaining ring 1442 is inserted into the annular groove 1231. One end of the elastic retaining ring 1442 abuts against the electromagnetic coil 131, and the other end of the elastic retaining ring 1442 abuts against the inner sealing cover 1441, so that the inner sealing cover 1441, the elastic retaining ring 1442 and the first shaft body 122 jointly fix the electromagnetic coil 131.

[0026] Further, two annular accommodation grooves 14411 are formed on the inner sealing cover 1441. The inner sealing portion 144 further includes rubber rings 1444. The number of the rubber rings 1444 is the same as that of the annular accommodation grooves 14411. The rubber rings 1444 are located in the annular accommodation grooves 14411. The inner sealing cover 1441 is covered on the sealing ring 1434. The rubber rings 1444 are located between the inner sealing cover 1441 and the sealing ring 1434, so that the rubber rings 1444 seal the sealing ring 1434. At the same time, because the rubber rings 1444 have a certain elasticity, there is a certain elastic space between the inner sealing cover 1441 and the sealing ring 1434, thereby reducing the mechanical wear between the inner sealing cover 1441 and the sealing ring 1434.

[0027] Further, in order to improve the stability between the permanent magnet ring 132 and the electromagnetic coil 131 and prevent the permanent magnet ring 132 and the electromagnetic coil 131 from relatively shifting, the vertical cross-section of the permanent magnet ring 132 is frustum-shaped, and the conical surface directions of the two electromagnetic coils 131 are opposite. The vertical cross-section of the permanent magnet ring 132 is matched with the electromagnetic coil 131, so that there is a gap between the permanent magnet ring 132 and the electromagnetic coil 131 for suspended support.

[0028] On the other hand, the present invention also provides a belt conveyor, including the electromagnetic suspension drum 10 for belt conveyor described in the above aspect.

[0029] The assembly process of the electromagnetic suspension drum 10 for belt conveyor is as follows: First, place the permanent magnet ring 132 into the second cavity 112. One end of the permanent magnet ring 132 abuts against the first cavity 122. Then, insert the snap ring 142 into the second cavity 112. One end of the snap ring 142 abuts against the other end of the permanent magnet ring 132, and the other end of the snap ring 142 extends into the third cavity 113. Subsequently, insert the roller shaft 120 into the cylinder body 110. The electromagnetic coil 131 is sleeved on the second shaft body 123. One end of the electromagnetic coil 131 abuts against the first shaft body 122. The elastic snap ring 1442 is inserted into the annular groove 1231, and one end of the elastic snap ring 1442 abuts against the other end of the electromagnetic coil 131. Use a tool to hook out the connecting wire of the electromagnetic coil 131 from the connecting hole 121. Then, snap the outer retaining ring 1432 between the snap ring 142 and the inner wall of the third cavity 113. Finally, use a press to cover the inner seal cover 1441 on the sealing ring 1434 to complete the assembly.

[0030] The working principle of the electromagnetic suspension roller 10 for belt conveyors is as follows: After the electromagnetic coil 131 is energized using a power source and connecting wires, the magnetic property of the electromagnetic coil 131 becomes the same as that of the permanent magnet ring 132. Based on the principle of like poles repelling each other, the roller shaft 120 obtains a suspension support force, and the cylinder body 110 realizes rotation without mechanical friction. Moreover, the suspension support force between the permanent magnet ring 132 and the electromagnetic coil 131 can be adjusted by the magnitude of the current of the power source. The greater the current of the power source, the stronger the magnetic property of the electromagnetic coil 131; the smaller the current of the power source, the weaker the magnetic property of the electromagnetic coil 131.

[0031] During operation, the cylinder body 110 rotates, thereby driving the clamping ring 142, the outer sealing portion 143, and the permanent magnet ring 132 to rotate together. The vertical cross-section of the outer sealing cover 1433 is funnel-shaped, with a larger opening at the end close to the opening of the cylinder body 110 and a smaller opening at the end close to the permanent magnet ring 132, showing a shrinking trend. On the one hand, this makes the contact area between the outer sealing cover 1433 and dust and moisture relatively large. Most of the dust and moisture will be initially blocked by the outer sealing cover 1433 and cannot directly reach the contact position between the outer sealing cover 1433 and the inner sealing portion 144. A small amount of dust or moisture is intercepted at the arc-shaped transition position between the outer sealing cover 1433 and the sealing ring 1434. Moreover, when the cylinder body 110 rotates, the outer sealing cover 1433 will rotate with the cylinder body 110. The arc-shaped transition structure between the outer sealing cover 1433 and the sealing ring 1434 causes the intercepted dust or moisture to be shaken off and discharged, thereby effectively blocking external substances from entering the sealed space enclosed by the electromagnetic coil protection component 140 and the cylinder body 110, avoiding erosion or wear of the electromagnetic coil 131 and the permanent magnet ring 132. In particular, it can effectively prevent water vapor from entering the sealed space enclosed by the electromagnetic coil protection component 140 and the cylinder body 110, avoiding the electromagnetic coil 131 from getting damp, which may affect its insulation performance and even cause short-circuit or open-circuit faults. On the other hand, it makes the dust and moisture on the surface of the outer sealing cover 1433 gather and not directly fall onto the inner sealing portion 144 or the roller shaft 120. At the same time, since the vertical cross-section of the sealing ring 1434 is funnel-shaped, with a larger opening at the end close to the opening of the cylinder body 110 and a smaller opening at the end close to the permanent magnet ring 132, showing a shrinking trend, dust and moisture will not enter the inner sealing portion 144. The outer sealing cover 1433 and the sealing ring 1434 work together to prevent dust and moisture from entering the cylinder body 110 to protect the electromagnetic coil 131 and the permanent magnet ring 132. The inner sealing cover 1441 is covered on the sealing ring 1434, and the rubber ring 1444 is located between the inner sealing cover 1441 and the sealing ring 1434. The rubber ring 1444 seals the sealing ring 1434. The elastic retaining ring 1442 is inserted into the annular groove 1231 to further prevent dust and moisture on the roller shaft 120 from entering the cylinder body 110. At the same time, one end of the elastic retaining ring 1442 abuts against the electromagnetic coil 131, and the other end of the elastic retaining ring 1442 abuts against the inner sealing cover 1441, so that the inner sealing cover 1441, the elastic retaining ring 1442, and the first shaft body 122 jointly fix the electromagnetic coil 131.

[0032] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand the entire or partial processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. An electromagnetic levitation drum for a belt conveyor, characterized in that: It includes a cylinder body, a roller shaft, and two sets of magnetic levitation components. The roller shaft penetrates through the cylinder body. The two sets of magnetic levitation components are respectively located between the two ends of the cylinder body and the roller shaft. The magnetic levitation component includes an electromagnetic coil and a permanent magnet ring. The electromagnetic coil is sleeved on the roller shaft. The permanent magnet ring is arranged in the cylinder body and is located between the cylinder body and the electromagnetic coil. There is a gap between the electromagnetic coil and the permanent magnet ring. The cylinder body drives the permanent magnet ring to rotate. The energized electromagnetic coil and the permanent magnet ring are in a suspended support, so as to control the suspended support force between the electromagnetic coil and the permanent magnet ring by adjusting the magnitude of the current to ensure that the electromagnetic coil and the permanent magnet ring do not come into contact.

2. The electromagnetic suspension drum for belt conveyor according to claim 1, characterized in that: The cylinder body includes a first cavity and two second cavities. The inner diameters of the two second cavities are both larger than that of the first cavity, and the two second cavities are respectively located at both ends of the first cavity. The two permanent magnet rings are respectively located in the two second cavities, and the permanent magnet ring and the second cavity are in a transition fit.

3. The electromagnetic suspension drum for belt conveyor according to claim 2, wherein: The roller shaft includes a first shaft body and two second shaft bodies. The radii of the two second shaft bodies are both smaller than that of the first shaft body, and the two second shaft bodies are respectively located at both ends of the first shaft body. The length of the first shaft body is the same as that of the first cavity. The two electromagnetic coils are respectively sleeved on the two second shaft bodies.

4. The electromagnetic suspension drum for belt conveyor according to claim 3, wherein: The electromagnetic levitation roller for a belt conveyor further includes two sets of electromagnetic coil protection components. The middle parts of the two sets of electromagnetic coil protection components both have a first through hole. The two sets of electromagnetic coil protection components are both located in the cylinder body and are respectively located at the openings at both ends of the cylinder body. The roller shaft penetrates through the first through hole. One end of the electromagnetic coil abuts against the first shaft body, and the other end of the electromagnetic coil abuts against the electromagnetic coil protection component, so that the electromagnetic coil protection component and the first shaft body jointly fix the electromagnetic coil. At the same time, the electromagnetic coil protection component and the cylinder body enclose a sealed space to ensure that the electromagnetic coil is not eroded or worn by external substances.

5. The electromagnetic suspension drum for belt conveyor according to claim 4, characterized in that: The cylinder body further includes two third cavities. The inner diameters of the two third cavities are both larger than those of the two second cavities, and the two third cavities are respectively located at one end of the two second cavities close to the opening of the cylinder body. The electromagnetic coil protection assembly includes snap rings, an outer sealing part, and an inner sealing part. There are two snap rings, and the numbers of the outer sealing part and the inner sealing part are the same as that of the snap rings. The middle of the inner sealing part has the first through hole, and the middle of the outer sealing part has the second through hole. The snap rings are located on the side of the permanent magnet ring close to the opening of the cylinder body, and one ends of the two snap rings are in transitional fit with the two second cavities. The other ends of the two snap rings respectively extend into the two third cavities. The two outer sealing parts are respectively located in the two third cavities, and the outer sealing part is clamped between the snap ring and the inner wall of the third cavity. The two inner sealing parts are respectively arranged on the two second through holes. The outer sealing part and the inner sealing part can rotate relatively and jointly form a sealed space with the cylinder body.

6. The electromagnetic suspension drum for belt conveyors according to claim 5, characterized in that: The outer sealing part includes an outer retaining ring, an outer sealing cover, and a sealing ring. The second through hole is opened in the middle of the outer sealing cover. The vertical cross-sections of the outer sealing cover and the sealing ring are both funnel-shaped. The outer retaining ring is clamped between the snap ring and the inner wall of the third cavity. The outer sealing cover surrounds the inner circumferential surface of the outer retaining ring. The sealing ring surrounds the second through hole. The inner sealing part is arranged on the sealing ring. The outer retaining ring and the outer sealing cover are integrally formed. The outer sealing cover and the sealing ring are integrally formed. The sealing ring and the inner sealing part can rotate relatively.

7. The electromagnetic suspension drum for belt conveyor according to claim 6, characterized in that: Annular grooves are opened on both of the two second shafts, and the annular grooves are located on the side of the electromagnetic coil close to the opening of the cylinder body. The inner sealing part includes an inner sealing cover and an elastic retaining ring. The first through hole is opened in the middle of the inner sealing cover. The elastic retaining ring is adapted to the annular groove. The inner sealing cover covers the sealing ring, and the inner sealing cover and the sealing ring are in transitional fit so that the inner sealing cover and the sealing ring can rotate relatively. The elastic retaining ring is located at one end of the first through hole close to the electromagnetic coil. The elastic retaining ring is inserted into the annular groove. One end of the elastic retaining ring abuts against the electromagnetic coil, and the other end of the elastic retaining ring abuts against the inner sealing cover.

8. The electromagnetic suspension drum for a belt conveyor according to claim 7, wherein: At least one annular accommodation groove is opened on the inner sealing cover. The inner sealing part further includes rubber rings. The number of the rubber rings is the same as that of the annular accommodation grooves. The rubber rings are located in the annular accommodation grooves. The inner sealing cover covers the sealing ring. The rubber rings are located between the inner sealing cover and the sealing ring so that the rubber rings seal the sealing ring.

9. The electromagnetic suspension drum for belt conveyor according to claim 1, characterized in that: The vertical cross-section of the permanent magnet ring is frustum-shaped, and the conical surface directions of the two electromagnetic coils are opposite. The vertical cross-section of the permanent magnet ring is matched with the electromagnetic coil so that there is a gap between the permanent magnet ring and the electromagnetic coil for suspended support.

10. A belt conveyor, characterized in that: Comprising an electromagnetic suspension drum for a belt conveyor as described in any one of claims 1-9.

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