A permanent magnet internal mine hoist

Abstract

This application provides a permanent magnet internal mine hoist, belonging to the field of hoist technology. It includes two symmetrically arranged supports, a stator, a rotor, a drum, and a cooling assembly. A main shaft is fixedly arranged between the two supports. The drum is coaxially rotatably mounted on the main shaft, with a steel wire rope wound around its outer arc surface. A connecting cylinder is coaxially arranged inside the drum, and the rotor is coaxially fixedly installed on the inner arc surface of the connecting cylinder. Connecting plates are evenly arranged circumferentially in the middle of the main shaft, and the stator is fixedly connected to the outer arc surface of each connecting plate. The stator and rotor are coaxially arranged and form an electromagnetic connection. The cooling assembly includes a semiconductor cooling chip and fan blades. The semiconductor cooling chip is evenly fixedly installed on the outer circumferential surface of the connecting cylinder, with the cold end of the semiconductor cooling chip facing the rotor side. This application can solve the problems of insufficient targeted heat dissipation structure and low heat dissipation efficiency in existing permanent magnet internal mine hoists, leading to poor operational stability.

Description

Technical Field

[0001] This application relates to the field of hoisting technology, specifically to a permanent magnet internal mine hoist. Background Technology

[0002] In the field of mine hoisting equipment, the internally mounted mine hoist, with its integrated layout of permanent magnet motor and hoisting drum, has significant structural advantages over traditional externally mounted permanent magnet hoists and asynchronous motor hoists. It greatly shortens the power transmission link, effectively reduces power loss during transmission, and significantly improves transmission efficiency. At the same time, it reduces the overall size and space occupied by the equipment, making it more suitable for the narrow and complex installation environment of underground mines, and reducing the difficulty of equipment transportation and installation. It has gradually become one of the preferred solutions for mine hoisting systems.

[0003] However, while the integrated structure of permanent magnet internal mine hoists brings many advantages, it also raises significant heat dissipation challenges. Because the core heat-generating components, such as the stator and rotor, are enclosed inside the drum, the heat generated by the rotor's permanent magnets and the heat from stator winding losses is difficult to dissipate quickly during prolonged high-load operation, easily leading to temperature buildup and increases inside the drum. Furthermore, the magnetic properties of permanent magnets are extremely sensitive to temperature; excessively high temperatures can cause irreversible demagnetization of the permanent magnets and reduce the insulation performance of the stator windings, severely impacting the hoist's operational stability and service life.

[0004] Referring to Chinese patent application document CN118713333A, published on September 27, 2024, entitled "An Internally Mounted External Rotor Hybrid Excitation Mining Hoist with Cooling Structure," the invention includes a motor body and a cooling system. The motor body includes a rotor housing, a permanent magnet rotor, an electrically excited winding rotor, and a stator. The right side portion has permanent magnet cooling pipes and electrically excited cooling pipes respectively. The cooling system includes a coolant tank and a gear pump. The coolant tank is connected to the internal water inlet channel of the stator shaft through the gear pump and pipes, and the internal water outlet channel of the stator shaft is connected to the coolant tank through pipes.

[0005] Referring to the above technical solution, the coolant tank is connected to the inlet channel inside the stator shaft via a gear pump and pipelines, and the outlet channel inside the stator shaft is connected to the coolant tank via pipelines, transferring heat from inside the motor to the coolant. In actual applications, the rotor temperature is usually higher (especially in permanent magnet internal structures, where the rotor is located in the core enclosed area of ​​the drum, where heat radiation and conduction paths are blocked, and heat easily accumulates around the rotor, often reaching a temperature 20-50°C higher than the stator). The rotor's heat needs to be conducted sequentially from inside the drum to the drum wall and then dissipated to the outside. This results in a long heat dissipation path and low heat transfer efficiency, making it difficult to quickly remove the concentrated heat generated inside the drum and the rotor. Relying solely on coolant flow to dissipate heat from the stator is ineffective and cannot meet the requirements. A low coolant delivery rate leads to low heat transfer efficiency, which is far from meeting the heat dissipation needs of the hoist during high-load operation. A high coolant delivery rate, on the other hand, cannot fully exchange heat, causing the external coolant supply equipment to operate continuously at high loads, increasing the equipment's operating burden. Summary of the Invention

[0006] In view of this, this application provides a permanent magnet internal mine hoist, which aims to solve the problems of insufficient heat dissipation structure and low heat dissipation efficiency of existing permanent magnet internal mine hoists, resulting in poor operational stability.

[0007] To solve the above-mentioned technical problems, this application provides a permanent magnet internal mine hoist, including two symmetrically arranged supports, a stator, a rotor, a drum, and a cooling assembly. A main shaft is fixedly arranged between the two supports. The drum is coaxially rotatably mounted on the main shaft. A steel wire rope is wound on the outer arc surface of the drum. A connecting cylinder is coaxially arranged inside the drum. The rotor is coaxially fixedly installed on the inner arc surface of the connecting cylinder. A connecting plate is evenly arranged circumferentially in the middle of the main shaft. The stator is fixedly connected to the outer arc surface of the connecting plate. The stator and rotor are coaxially arranged and form an electromagnetic connection.

[0008] The cooling assembly includes a thermoelectric cooler and fan blades. The thermoelectric cooler is uniformly fixedly installed on the outer circumferential surface of the connecting cylinder, with the cold end of the thermoelectric cooler facing the rotor side. The fan blades are uniformly rotated around the outer arc surface of the right end of the main shaft through bearings. The outer ends of the fan blades are all fixedly connected to the inner ring of the second bearing provided on the inner arc surface of the drum. The outer ring of the first bearing is connected to the side plate of the drum through a transmission component. Heat dissipation holes are provided on the side plate.

[0009] By adopting the above technical solution, the semiconductor cooling chip is fixed on the outer circumference of the connecting cylinder with its cold end close to the rotor, directly acting on the surrounding area of ​​the rotor to absorb the heat generated during rotor operation and conduct it to the hot end, effectively preventing the rotor temperature from becoming too high; the fan blade is installed on the right end of the main shaft through bearing one, and its outer end is connected to bearing two inside the drum. The outer ring of bearing one is linked to the side plate of the drum through a transmission component. When the drum rotates, the outer ring of bearing one is driven to rotate through the transmission component, thereby driving the fan blade to rotate and accelerating the air flow inside the drum. At the same time, the heat dissipation holes on the side plate provide a channel for air circulation, so that the air around the rotor cooled by the semiconductor cooling chip can quickly exchange with the air in other areas inside the drum, and the heat is discharged through the heat dissipation holes to achieve efficient cooling of the rotor, avoiding the demagnetization of the permanent magnet and the degradation of the insulation performance of the stator winding due to high temperature.

[0010] Optionally, the cooling assembly further includes a main channel, connecting rings, conduits, and branch channels. The main channels are axially opened inside both ends of the main shaft. There are two connecting rings, which are fixedly connected to both ends of the outer arc surface of the main shaft. The inner ends of the main channels are respectively connected to the inner chambers of the adjacent connecting rings. The conduits are circumferentially and uniformly fixed on the connecting rings and are connected to the inner chambers of the connecting rings. The branch channels are respectively opened inside the connecting plate. The two ends of the branch channels are respectively connected to the conduits corresponding to the axial direction. The outer end of the main channel on the right is used to connect to an external coolant supply device.

[0011] By adopting the above technical solution, the external coolant supply device supplies coolant to the connecting ring through the main channel on the right. The coolant enters the branch channel through the conduit, and carries away the heat transferred from the stator to the connecting plate when it flows through the connecting plate. Then it is discharged through the conduit on the left, the connecting ring and the main channel, forming a coolant circulation for heat dissipation. Combined with the airflow driven by the fan blades, it also dissipates heat from the stator and the connecting plate, further improving the overall heat dissipation effect and ensuring that the stator works stably at a suitable temperature.

[0012] Optionally, it also includes bending plates, wherein there are multiple bending plates and each is fixedly disposed between two adjacent connecting plates.

[0013] By adopting the above technical solution, the bending plate is fixed between two adjacent connecting plates, which increases the connection strength between the connecting plates and makes the support of the connecting plates for the stator more stable. At the same time, the bending plate expands the contact area with the airflow inside the drum. When the airflow flows over the surface of the bending plate, it can carry away more heat, improve the heat exchange efficiency, and help improve the heat dissipation effect.

[0014] Optionally, it also includes V-shaped guide rings, two of which are fixedly mounted on the left and right ends of the connecting cylinder by multiple mounting plates. The opening of the V-shaped guide ring is close to the gap sidewall of the stator and rotor and is not in contact with the sidewall of the stator and rotor. The mounting plates pass through the internal space of the V-shaped guide ring and are connected to the connecting cylinder.

[0015] By adopting the above technical solution, when the airflow flows inside the drum, the V-shaped structure of the V-shaped guide ring guides the airflow, causing the airflow to flow along the outer side of the V-shape. This reduces the direct entry of airflow into the air gap between the stator and rotor, preventing airflow disturbance from disrupting the uniformity of the magnetic field. At the same time, it blocks dust and impurities carried in the airflow from entering the air gap, preventing dust accumulation from affecting the electromagnetic coordination between the stator and rotor, ensuring the stable operation of the stator and rotor, and preventing dust accumulation from reducing the heat dissipation effect.

[0016] Optionally, both ends of the main shaft are provided with support plates via bearings, and the outer edges of the support plates are fixedly connected to the inner wall of the drum. The connecting cylinder is fixedly installed between the two support plates, and the support plates are provided with strip holes for airflow.

[0017] By adopting the above technical solution, the support plate is mounted on both ends of the main shaft by bearings in three rotations, with its outer edge fixed to the inner wall of the drum. The connecting cylinder is fixed between the two support plates, so that the connecting cylinder and the drum rotate synchronously, ensuring that the rotor runs stably with the drum. At the same time, the strip holes on the support plate provide a channel for air circulation between the inside and outside of the drum. Together with the heat dissipation holes on the side plate, it promotes bidirectional airflow, accelerates heat dissipation, and improves heat dissipation efficiency.

[0018] Optionally, it also includes air guide ducts, which are circumferentially and uniformly fixedly installed on the side plates of the drum, and the air guide ducts are configured to cooperate with the heat dissipation holes.

[0019] By adopting the above technical solution, the air guide tube is fixed to the side plate of the drum and cooperates with the heat dissipation holes. It guides the airflow entering and exiting the drum through the heat dissipation holes, so that the external air enters the drum in a specific direction, and at the same time guides the hot air inside the drum to be discharged in a specific direction, avoiding the reverse flow of airflow from affecting the heat dissipation effect and accelerating the heat exchange rate.

[0020] Optionally, the interior of the air duct is filled with filter material.

[0021] By adopting the above technical solution, the air guide tube is filled with filter material. When external air enters the drum through the air guide tube, the filter material intercepts dust and impurities in the air, reducing the amount of dust entering the drum and adhering to the surface of components such as stator, rotor, and connecting plate. This prevents dust from affecting the operating accuracy and heat dissipation of the components and extends their service life.

[0022] Optionally, the transmission component includes a bevel ring one, a bevel gear, and a bevel ring two. The bevel ring one is fixedly installed on the inner wall of the right side plate, and the bevel ring two is fixedly installed on the right side of the outer ring of bearing one. The bevel gear is rotatably mounted on the main shaft via a support shaft, and the bevel gear meshes with bevel ring one and bevel ring two respectively.

[0023] By adopting the above technical solution, when the drum rotates, it drives the first bevel gear ring to rotate, and through the transmission action of the bevel gear, it drives the second bevel gear ring to rotate in the opposite direction, thereby driving the outer ring of the first bearing to rotate, realizing the rotation of the fan blade. The fan blade can run synchronously with the drum without the need for an additional power source, saving energy. Moreover, the transmission structure is stable, ensuring that the fan blade rotates continuously to promote airflow.

[0024] Optionally, it also includes disc brakes, with brake discs fixedly installed on the opposite outer sides of the two side plates. The disc brakes are fixedly installed on the left and right sides of the drum, and each set of disc brakes includes a pair of two braking devices. The two braking devices are clamped on both sides of the brake disc to jointly hold the brake disc.

[0025] By adopting the above technical solution, when braking is required, the braking devices of the two sets of disc brakes clamp the brake discs relative to each other. The friction between the braking device and the brake discs hinders the rotation of the brake discs, thereby driving the drum to stop rotating. The braking method is reliable and responds quickly, effectively controlling the drum speed or achieving emergency braking, and ensuring the safe operation of the hoist.

[0026] Optionally, an O-ring is provided between the connecting ring and the main shaft, and a skeleton oil seal is provided at the connection between the guide tube and the connecting ring.

[0027] By adopting the above technical solutions, the O-ring seal and the skeleton oil seal effectively prevent the heat dissipation effect from decreasing due to coolant leakage, and at the same time prevent the leaked coolant from corroding other components.

[0028] In summary, compared with the prior art, this application includes the following beneficial technical effects:

[0029] 1. The semiconductor cooling chip is fixed to the outer circumference of the connecting cylinder with its cold end close to the rotor, which can absorb the rotor's heat. By setting a flow channel inside the connecting plate and introducing coolant, the stator is cooled. At the same time, the fan blades are driven to rotate through the cooperation of bevel ring one, bevel gear and bevel ring two. The kinetic energy of the drum is converted into the driving force of the fan blades by the transmission component, forming a bidirectional airflow circulation. Heat dissipation and synchronous operation of the hoist can be achieved without additional power, simplifying the structure, reducing energy consumption and improving operational stability.

[0030] 2. The V-shaped structure of the V-shaped guide ring guides the airflow, causing it to flow along the outer side of the V-shape. This reduces the direct entry of airflow into the air gap between the stator and rotor, preventing airflow disturbance from disrupting the uniformity of the magnetic field. At the same time, it blocks dust and impurities carried in the airflow from entering the air gap, preventing dust accumulation from affecting the electromagnetic coordination between the stator and rotor, ensuring the stable operation of the stator and rotor, and avoiding dust accumulation that reduces heat dissipation.

[0031] 3. The bending plate is fixed between two adjacent connecting plates, which increases the connection strength between the connecting plates and makes the support of the connecting plates for the stator more stable. At the same time, the bending plate expands the contact area with the airflow inside the drum. When the airflow flows over the surface of the bending plate, it can carry away more heat, improve the heat exchange efficiency, and help improve the heat dissipation effect.

[0032] 4. Adopting an internal permanent magnet structure improves space utilization and transmission efficiency. The rotor is installed internally in the connecting cylinder inside the drum, and the stator and main shaft are coaxially fixed through the connecting plate, which greatly shortens the transmission link, reduces power loss, and improves transmission efficiency compared to traditional external permanent magnet hoists; at the same time, the compact internal structure significantly reduces the overall size of the equipment, making it more suitable for the limited installation space in mines and effectively expanding the scope of application of the equipment. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a permanent magnet internal mine hoist according to this application;

[0034] Figure 2 This is a schematic diagram of the front sectional planar structure of this application;

[0035] Figure 3 This is a schematic diagram of the right sectional planar structure of this application;

[0036] Figure 4 For this application Figure 2 A magnified structural diagram of region A in the middle;

[0037] Figure 5 For this application Figure 2 A magnified structural diagram of region B in the middle;

[0038] Figure 6 This is a schematic diagram of the connecting cylinder and the semiconductor cooling chip of this application;

[0039] Figure 7 This is a schematic diagram of the planar structure of the V-shaped flow guide ring of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Support; 2. Stator; 3. Rotor; 4. Drum; 41. Side plate; 5. Cooling assembly; 51. Semiconductor refrigeration chip; 52. Fan blade; 53. Main channel; 54. Connecting ring; 55. Conduit; 56. Diverter channel; 6. Main shaft; 7. Wire rope; 8. Connecting cylinder; 9. Connecting plate; 10. Bearing 1; 11. Bearing 2; 12. Transmission component; 121. Bevel gear ring 1; 122. Bevel gear; 123. Bevel gear ring 2; 13. Bending plate; 14. V-shaped guide ring; 141. Mounting plate; 15. Support plate; 151. Strip hole; 16. Air guide tube; 17. Filter media; 18. Disc brake; 19. Brake disc; 20. Braking device; 21. O-ring seal; 22. Frame oil seal; 23. Bearing 3. Detailed Implementation

[0041] The following will be described in conjunction with embodiments of this application. Figures 1-7 The technical solutions of the embodiments of this application are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this application are within the scope of protection of this application.

[0042] Reference Figure 1 and Figure 2 This embodiment provides a permanent magnet internal mine hoist, including a support 1, a stator 2, a rotor 3, a drum 4, a cooling assembly 5, and a disc brake 18. The stator 2 and the rotor 3 are coaxially arranged and form an electromagnetic connection to drive the drum 4 to rotate. The cooling assembly 5 is used to cool the stator 2 and the rotor 3, and the disc brake 18 is used to brake the drum 4.

[0043] Reference Figure 2 A main shaft 6 is fixedly installed between two supports 1. Support plates 15 are rotatably mounted on the outer arc surfaces of both ends of the main shaft 6 via bearings 23. The outer edges of the support plates 15 are fixedly connected to the inner wall of the drum 4. A connecting cylinder 8 is fixedly installed between the two support plates 15. The rotor 3 is coaxially fixedly installed on the inner arc surface of the connecting cylinder 8 (the permanent magnets of the rotor 3 are arranged in a built-in V-shape and are made of neodymium iron boron permanent magnet material, which is fixed by interference fit). Connecting plates 9 are evenly arranged circumferentially in the middle of the main shaft 6. The stator 2 is fixedly installed on the outer arc surface of multiple connecting plates 9. It is coaxially fixed with the main shaft 6 through the evenly distributed connecting plates 9 (the stator 2 adopts distributed winding, the winding is embedded in the slot of the stator 2 core, and the core is made of silicon steel sheets). The stator 2 and the rotor 3 are coaxially arranged and form an electromagnetic engagement. A steel wire rope 7 is wound on the outer arc surface of the drum 4.

[0044] When in use, after the stator 2 is connected to three-phase AC power, it will generate a rotating magnetic field. This rotating magnetic field interacts with the permanent magnet on the rotor 3 to generate electromagnetic torque, which drives the rotor 3 to rotate. The rotor 3 drives the support plate 15 to rotate through the connecting cylinder 8. The middle part of the support plate 15 rotates relative to the main shaft 6 through the bearing 23. The outer edge of the support plate 15 drives the drum 4 to rotate, thereby driving the wire rope 7 to wind.

[0045] Reference Figure 2 , Figure 3 and Figure 6The cooling assembly 5 includes a semiconductor cooling chip 51, fan blades 52, a main flow channel 53, a connecting ring 54, a conduit 55, and a branch flow channel 56. The semiconductor cooling chip 51 is uniformly and fixedly installed on the outer circumferential surface of the connecting cylinder 8, with the cold end of the semiconductor cooling chip 51 facing the rotor 3 and tightly fitted to the outer wall of the connecting cylinder 8. The semiconductor cooling chip 51 (its working principle is based on the Peltier effect, where a temperature difference is generated at the two ends of the coupler when direct current passes through a couple composed of two different semiconductor materials, with the cold end absorbing heat and the hot end releasing heat) can quickly absorb the heat generated by the rotor 3 during operation, preventing the rotor 3 from overheating and causing demagnetization of the permanent magnet or a decrease in insulation performance. The fan blades 52 are uniformly and circumferentially mounted on the outer arc surface of the right end of the main shaft 6 via bearing 10. The inner ring of bearing 10 is fixedly fitted to the main shaft 6, and the outer ring is fixedly connected to the fan blades 52. At the same time, the outer ends of the fan blades 52 are all fixedly connected to the inner ring of bearing 11 set on the inner arc surface of the drum 4. The outer ring of the 10 is connected to the side plate 41 of the drum 4 via a transmission component 12. The support plate 15 has a strip-shaped hole 151 for airflow, and the side plate 41 has heat dissipation holes. Both the strip-shaped hole 151 and the heat dissipation holes facilitate airflow inside and outside the drum 4. The drum 4 drives the fan blade 52 to rotate via the transmission assembly, increasing airflow inside the drum 4 and facilitating rapid heat dissipation between the connecting drum 8 and the drum 4, thus improving heat exchange efficiency. (Bearing) The outer ring of bearing 10 is connected to the side plate 41 of the drum 4 via a transmission component 12. The transmission component 12 includes a bevel ring 121, a bevel gear 122, and a bevel ring 123. The bevel ring 121 is fixedly installed on the inner wall of the right side plate 41, and the bevel ring 123 is fixedly installed on the right side of the outer ring of bearing 10. The bevel gear 122 is rotatably mounted on the main shaft 6 via a support shaft. The bevel gear 122 meshes with the bevel ring 121 and the bevel ring 123 respectively (e.g., ...). Figure 4 ).

[0046] During the rotation of the drum 4, the bevel gear ring 121 rotates. Since the bevel gear 122 is meshed with the bevel gear ring 121 and the bevel gear ring 123 respectively, the bevel gear ring 121 drives the bevel gear ring 123 to rotate in the opposite direction through the bevel gear 122, and then drives the fan blade 52 to rotate through the outer ring of the bearing 10, promoting the airflow inside the drum 4 to flow to the left.

[0047] The thermoelectric cooler 51 is powered by a slip ring assembly (the slip ring assembly is fixed to one end of the main shaft 6, including a stationary ring fixed to the main shaft 6 and a moving ring fixed to the connecting cylinder 8; the moving ring is electrically connected to the thermoelectric cooler 51, and the stationary ring is connected to an external DC power supply), which rapidly dissipates heat from the rotor 3. During the rotation of the fan blade 52, the airflow carries away the heat from the hot end of the thermoelectric cooler 51. Since the thermoelectric cooler 51 actively conducts heat away from the rotor 3, and the fan blade 52 accelerates the airflow to enhance heat exchange, the heat dissipation efficiency can be greatly improved compared to the natural heat dissipation of the rotor 3, thus preventing the rotor 3 from failing due to high temperature.

[0048] Reference Figure 2 and Figure 5 Main channels 53 are axially opened at both ends of the main shaft 6. There are two connecting rings 54, which are fixedly connected to both ends of the outer arc surface of the main shaft 6. The connecting rings 54 have annular chambers inside. The inner ends of the main channels 53 communicate with the annular chambers of the adjacent connecting rings 54 through through holes in the side wall of the main shaft 6. The guide tubes 55 are circumferentially and evenly fixed on the connecting rings 54. The connecting rings 54 serve to divert the coolant and prevent the main shaft 6 from weakening due to multiple main channels 53 in multiple directions. The branch channels 56 are opened inside the connecting plate 9. One end of the guide tube 55 communicates with the annular chamber of the connecting ring 54, and the other end extends to the connecting plate 9 and connects with the branch channels 56. An O-ring 21 is provided between the connecting ring 54 and the main shaft 6. A skeleton oil seal 22 is provided at the connection between the guide tube 55 and the connecting ring 54 (see reference). Figure 5 To prevent coolant leakage, the outer end of the main channel 53 on the right is used to connect to an external coolant supply device (such as a coolant circulation pump or a coolant tank). A bent plate 13 is fixed between two adjacent connecting plates 9, and the bent plate 13 is fixed to the side of the two adjacent connecting plates 9 by welding.

[0049] The conduit 55 on the right connecting ring 54 is the liquid inlet conduit, and the conduit 55 on the left connecting ring 54 is the liquid outlet conduit. The external coolant supply device supplies coolant into the right connecting ring 54 through the main channel 53 on the right. The coolant enters the branch channel 56 through the conduit 55 on the right to dissipate heat from the connecting plate 9, and then dissipates heat from the stator 2 through the connecting plate 9. The coolant that has absorbed heat is discharged to the outside through the conduit 55 on the left, the connecting ring 54, and the main channel 53 on the left in sequence. At the same time, the fan blades 52 rotate to dissipate heat from the surface of the connecting plate 9. The bending plate 13 not only enhances the connection rigidity between adjacent connecting plates 9 and improves the stability of the stator 2 installation, but also increases the contact area with the airflow inside the drum 4. When the airflow flows over the surface of the bending plate 13, it can carry away more heat and help improve the heat dissipation efficiency.

[0050] Reference Figure 2 and Figure 7It also includes a V-shaped guide ring 14. There are two V-shaped guide rings 14, which are fixed to the inner arc surfaces of the left and right ends of the connecting cylinder 8 by multiple radially distributed mounting plates 141. The opening of the V-shaped guide ring 14 is close to the gap side wall of the stator 2 and the rotor 3, and keeps it in non-contact with the side wall of the stator 2 and the rotor 3, so as to ensure that the V-shaped guide ring 14 does not interfere with the stator 2 and the rotor 3 respectively. The mounting plates 141 pass through the internal space of the V-shaped guide ring 14 and are connected to the connecting cylinder 8. The V-shaped structure of the V-shaped guide ring 14 can form an airflow guiding channel, allowing the airflow inside the drum 4 to flow along the outer side of the V-shape, reducing the direct entry of airflow into the air gap between the stator 2 and the rotor 3. Since the airflow may contain dust or impurities, and airflow disturbances can disrupt the magnetic field uniformity between the stator 2 and the rotor 3, the V-shaped guide ring 14 reduces the interference of airflow on the magnetic field by changing the airflow direction, ensuring the stable operation of the stator 2 and the rotor 3, and also prevents dust from entering between the stator 2 and the rotor 3, avoiding dust accumulation that affects the heat dissipation effect.

[0051] Reference Figure 1 and Figure 2 The side plate 41 of the drum 4 is uniformly fixed with air guide tubes 16 in the circumferential direction. The air guide tubes 16 are set in conjunction with the heat dissipation holes. The outer end of the air guide tube 16 is provided with an inclined air inlet. The air guide tube 16 is used to control the direction of airflow in and out, and to prevent external airflow from being introduced into the drum 4 in the opposite direction. The interior of the air guide tube 16 is filled with fiberglass cotton filter material 17 to block external dust and reduce the adhesion of dust inside the drum 4.

[0052] Reference Figure 1 It also includes disc brakes 18. Brake discs 19 are fixedly installed on the opposite outer sides of the two side plates 41. The disc brakes 18 are fixedly installed on the left and right sides of the drum 4. Each set of disc brakes 18 includes two pairs of braking devices 20. The two braking devices 20 are clamped on both sides of the brake disc 19 to jointly hold the brake disc 19. The disc brakes 18 are centrally controlled by a hydraulic station. The control system triggers the braking command, the hydraulic station pressurizes rapidly, and the braking devices 20 clamp the brake disc 19 under hydraulic action to brake, ensuring the safe operation of the hoist.

[0053] The implementation principle of a permanent magnet internal mine hoist according to an embodiment of this application is as follows:

[0054] When the stator 2 is connected to three-phase alternating current, it generates a rotating magnetic field. The rotating magnetic field interacts with the permanent magnets on the rotor 3 to generate electromagnetic torque, driving the rotor 3 to rotate. The rotor 3 drives the support plate 15 to rotate through the connecting cylinder 8. The middle part of the support plate 15 rotates relative to the main shaft 6 through the bearing 23, and its outer edge drives the drum 4 to rotate, thereby realizing the winding of the wire rope 7 and completing the lifting operation.

[0055] During the operation of the hoist, the semiconductor refrigeration chip 51, based on the Peltier effect, has its cold end positioned close to the rotor 3, which can quickly absorb the heat generated by the rotor 3 during operation. The airflow generated by the rotation of the fan blades 52 flows directly through the hot end of the semiconductor refrigeration chip 51, quickly carrying away the heat from the hot end. This achieves a virtuous cycle of continuous heat absorption from the cold end of the rotor 3 and timely heat discharge from the hot end, preventing the rotor 3 from overheating and causing demagnetization of the permanent magnet or a decrease in insulation performance. The semiconductor refrigeration chip 51 is powered through a slip ring assembly, which includes a stationary ring fixed to the main shaft 6 and a moving ring fixed to the connecting cylinder 8. The moving ring is electrically connected to the semiconductor refrigeration chip 51, and the stationary ring is connected to an external DC power supply. Meanwhile, the rotation of the drum 4 drives the bevel gear ring 121 to rotate. Since the bevel gear 122 is meshed with the bevel gear ring 121 and the bevel gear ring 123 respectively, the bevel gear ring 121 drives the bevel gear ring 123 to rotate in the opposite direction through the bevel gear 122, which in turn drives the fan blade 52 to rotate through the outer ring of the bearing 10, promoting the airflow inside the drum 4 to flow to the left. During the airflow, the heat from the hot end of the semiconductor cooling chip 51 will be carried away. The strip hole 151 on the support plate 15 and the heat dissipation hole on the side plate 41 ensure smooth airflow between the inside and outside of the drum 4, further improving the heat exchange efficiency.

[0056] At the same time, the external coolant supply device supplies coolant into the connecting ring 54 on the right through the main channel 53 on the right. The coolant enters the branch channel 56 inside the connecting plate 9 through the conduit 55 on the right, dissipating heat from the connecting plate 9. Then, the connecting plate 9 dissipates heat from the stator 2. After absorbing heat, the coolant is discharged to the outside through the conduit 55 on the left, the connecting ring 54 and the main channel 53 on the left, thus achieving coolant heat dissipation.

[0057] The semiconductor cooling chip 51 actively absorbs the heat from the rotor 3. The airflow generated by the rotation of the fan blade 52 carries away the heat from the hot end of the semiconductor cooling chip 51 on the one hand, and flows over the surface of the stator 2 and the connecting plate 9 on the other hand, assisting the coolant in heat dissipation. The coolant flows through the interior of the connecting plate 9, directly carrying away the heat generated by the stator 2. The airflow and coolant target different heat-generating components and assist each other to ensure that the temperature of each area inside the drum 4 is balanced, and the overall heat dissipation efficiency is improved compared with a single heat dissipation method.

[0058] V-shaped guide rings 14 are fixedly installed at both ends of the connecting cylinder 8 by multiple mounting plates 141. The openings of the V-shaped guide rings 14 are close to the side wall of the gap between the stator 2 and the rotor 3 but not in contact. Their V-shaped structure can form an airflow guiding channel, so that the airflow inside the drum 4 flows along the outer side of the V-shape. This reduces the direct entry of airflow into the air gap between the stator 2 and the rotor 3 to avoid disrupting the uniformity of the magnetic field, and also prevents dust from entering the gap between them, preventing dust accumulation from affecting heat dissipation. The circumferentially uniformly fixed air guide tubes 16 on the side plate 41 are configured to cooperate with the heat dissipation holes. The inclined air inlet at the outer end of the air guide tube can control the direction of airflow in and out, preventing the reverse introduction of external airflow. The fiberglass cotton filter material 17 filled inside the air guide tube 16 can also block external dust and reduce the adhesion of dust inside the drum 4.

[0059] When braking is required, the control system triggers a braking command, the hydraulic station rapidly pressurizes, and the braking device 20, under hydraulic action, is relatively locked on both sides of the brake disc 19 and together clamps the brake disc 19, thereby braking the drum 4 and ensuring the safe operation of the hoist.

[0060] Furthermore, in the description of this application, the terms "installation", "connection", "linking", and "setting" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A permanent magnet internal mine hoist, characterized in that, It includes two symmetrically arranged supports, a stator, a rotor, a drum, and a cooling assembly. A main shaft is fixedly arranged between the two supports. The drum is coaxially rotatably mounted on the main shaft. A steel wire rope is wound on the outer arc surface of the drum. A connecting cylinder is coaxially arranged inside the drum. The rotor is coaxially fixedly installed on the inner arc surface of the connecting cylinder. Connecting plates are evenly arranged circumferentially in the middle of the main shaft. The stator is fixedly connected to the outer arc surface of the connecting plates. The stator and rotor are coaxially arranged and form an electromagnetic engagement. The cooling assembly includes a thermoelectric cooler and a fan blade. The thermoelectric cooler is uniformly fixedly installed on the outer circumferential surface of the connecting cylinder, with the cold end of the thermoelectric cooler facing the rotor side. The fan blade is uniformly rotated around the outer arc surface of the right end of the main shaft through a bearing. The outer ends of the fan blades are all fixedly connected to the inner ring of the second bearing set on the inner arc surface of the drum. The outer ring of the first bearing is connected to the side plate of the drum through a transmission component. Heat dissipation holes are provided on the side plate. The cooling assembly also includes a main channel, connecting rings, conduits, and branch channels. The main channels are axially opened inside both ends of the main shaft. There are two connecting rings, which are fixedly connected to both ends of the outer arc surface of the main shaft. The inner ends of the main channels are connected to the inner chambers of the adjacent connecting rings. The conduits are circumferentially and uniformly fixed on the connecting rings and are connected to the inner chambers of the connecting rings. The branch channels are opened inside the connecting plates, and the two ends of the branch channels are connected to the corresponding axial conduits. The outer end of the main channel on the right is used to connect to an external coolant supply device. The airflow generated by the fan blade rotation carries away the heat from the hot end of the semiconductor cooling chip and flows over the surface of the stator and connecting plate to assist in the cooling of the coolant. It also includes V-shaped guide rings. There are two V-shaped guide rings, which are fixed to the left and right ends of the connecting cylinder by multiple mounting plates. The opening of the V-shaped guide ring is close to the gap side wall of the stator and rotor and is not in contact with the side wall of the stator and rotor. The mounting plates pass through the internal space of the V-shaped guide ring and are connected to the connecting cylinder. The transmission components include a bevel ring I, a bevel gear, and a bevel ring II. The bevel ring I is fixedly installed on the inner wall of the right side plate, and the bevel ring II is fixedly installed on the right side of the outer ring of bearing I. The bevel gear is rotatably mounted on the main shaft via a support shaft. The bevel gear meshes with bevel ring I and bevel ring II respectively. During the rotation of the drum, bevel ring I is driven to rotate. Since the bevel gear meshes with bevel ring I and bevel ring II respectively, bevel ring I drives bevel ring II to rotate in the opposite direction through the bevel gear, which in turn drives the fan blade to rotate through the outer ring of bearing I, promoting the airflow inside the drum to flow to the left. It also includes bending plates, of which there are multiple bending plates and each is fixedly installed between two adjacent connecting plates.

2. The permanent magnet internal mine hoist according to claim 1, characterized in that: Both ends of the main shaft have support plates mounted on their outer arc surfaces via bearings. The outer edges of the support plates are fixedly connected to the inner wall of the drum. The connecting cylinder is fixedly installed between the two support plates. The support plates have strip-shaped holes for airflow.

3. A permanent magnet internal mine hoist according to claim 1, characterized in that: It also includes air guide tubes, which are uniformly fixedly installed on the side plates of the drum in a circumferential direction, and the air guide tubes are configured in conjunction with the heat dissipation holes.

4. A permanent magnet internal mine hoist according to claim 3, characterized in that: The air duct is filled with filter material.

5. A permanent magnet internal mine hoist according to claim 1, characterized in that: It also includes disc brakes, with brake discs fixedly installed on the opposite outer sides of the two side plates. The disc brakes are fixedly installed on the left and right sides of the drum. Each set of disc brakes includes a pair of two braking devices, which are clamped onto the two sides of the brake disc to jointly hold the brake disc.

6. A permanent magnet internal mine hoist according to claim 1, characterized in that: An O-ring is provided between the connecting ring and the main shaft, and a skeleton oil seal is provided at the connection between the guide tube and the connecting ring.

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