A high-power belt conveyor with high-torque permanent magnet variable frequency speed regulation motor roller

Abstract

The application discloses a high-torque permanent magnet variable-frequency speed-regulating electric roller for a high-power belt conveyor and relates to the technical field of belt conveyors.The roller mechanism comprises a frequency converter, a roller body and a main shaft, a cooling water channel is preset on the main shaft, an auxiliary mechanism is arranged on the main shaft, the auxiliary mechanism comprises a plurality of cooling fins, a plurality of communication holes and a plurality of groups of mounting plates, a water channel is reserved on each cooling fin for water delivery, a three-way pipe is communicated between two opposite water outlets of each cooling fin, a first check valve is communicated with the water outlet of each three-way pipe, a heat preservation pipe is communicated with the water outlet of each first check valve, and a plurality of heat-conducting fins are fixed to the outer wall of each cooling fin.The auxiliary mechanism can greatly reduce the local temperature rise of the stator assembly, relieve the high-temperature demagnetization of the permanent magnet, improve the heat dissipation efficiency and reduce the risk of water and electricity leakage.

Description

Technical Field

[0001] This invention relates to the field of belt conveyor technology, specifically to a high-torque permanent magnet variable frequency speed-regulating electric roller for high-power belt conveyors. Background Technology

[0002] Belt conveyors rely on the cyclic operation of a circular conveyor belt and are general-purpose conveying equipment for continuously transporting coal, ore, and bulk materials. High-power belt conveyors refer to large belt conveyors with long conveying distances, large conveying capacities, large belt widths, high lifting heights, and heavy loads. Among them, large belt conveyors have problems such as large starting inertia and difficulty in starting under heavy loads. However, these problems can be solved by using a low-speed, high-torque permanent magnet variable frequency electric drum, which can replace the complex drive of traditional motors and reducers and can adapt to the operating requirements of heavy loads, long distances, and harsh working conditions.

[0003] The mainstream cooling methods for existing high-torque permanent magnet variable frequency speed control electric drums in high-power belt conveyors mainly include four types: pure shaft water cooling, stator water jacket water cooling, internal cavity air cooling, end cover fan blade heat dissipation, and cylinder inner wall water cooling. Among them, pure shaft water cooling has a single heat dissipation path, stator water jacket water cooling has the disadvantages of leakage damaging the winding insulation and occupying radial space, reducing power density, air cooling has insufficient heat dissipation capacity under high power conditions, and cylinder inner wall water cooling has the defects of easy leakage of rotary seals, complex structure and high manufacturing cost. These conventional heat dissipation methods all have inherent shortcomings, namely, the equipment is prone to various faults such as low heat dissipation efficiency, water and electricity leakage, local overheating, and high temperature demagnetization of permanent magnets during operation. If the equipment is under heavy load, low speed and long-term continuous operation, the operating stability and overall service life of the permanent magnet variable frequency speed control electric drum will be affected.

[0004] Therefore, we propose a high-torque permanent magnet variable frequency speed-regulating electric roller for high-power belt conveyors to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a high-torque permanent magnet variable frequency speed control electric drum for high-power belt conveyors, in order to solve the problem that the mainstream cooling method of high-torque permanent magnet variable frequency speed control electric drum for existing high-power belt conveyors is insufficient, and the operating stability and overall service life of the permanent magnet variable frequency speed control electric drum will be affected when the equipment is running continuously at low speed under heavy load for a long time.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor, comprising a drum mechanism, wherein the drum mechanism includes a frequency converter, a drum body and a main shaft, wherein a cooling water channel is pre-set on the main shaft, and an auxiliary mechanism is provided on the main shaft; The auxiliary mechanism includes multiple cooling plates, multiple connecting holes, and multiple sets of mounting plates. Each cooling plate has a water channel for cooling water transportation. A three-way pipe is connected between two opposite water outlets on each cooling plate. A first check valve is connected to the water outlet of each three-way pipe. A heat insulation pipe is connected to the water outlet of each first check valve. Multiple heat-conducting plates are fixed on the outer wall of each cooling plate. The interior of each connecting hole is connected to the interior of the corresponding water channel inlet on the corresponding cooling plate. It also includes a fixing rod and a drain groove. The fixing rod is used to seal the outlet end of the cooling water channel that is blocked. The drain groove is preset at one end of the main shaft, and the outlet end of each of the heat insulation pipes extends into the interior of the drain groove.

[0007] Preferably, each cooling fin is fixedly sleeved on the main shaft, the water outlet of each insulation tube is fixedly penetrated through the surface of the main shaft, the water outlet of each insulation tube is fixedly penetrated through the inner wall of the cooling water channel, and each connecting hole is pre-set in the inner wall of the cooling water channel.

[0008] Preferably, multiple sets of mounting plates and multiple cooling fins are arranged in an alternating pattern, and multiple guide blocks are fixedly sleeved inside the drainage trough, with each guide block having a reserved water passage hole for the normal transport of cooling water carrying heat inside the drainage trough.

[0009] Preferably, each of the mounting plates is installed on the inner wall of the cylinder, one end of the main shaft is fixed with a connecting shell, the water outlet end of the connecting shell is connected to a second check valve, and the interior of the connecting shell is connected to the interior of the drainage groove.

[0010] Preferably, the cylinder is located on one side of the frequency converter, the main shaft is located inside the cylinder, and end caps are respectively connected to both ends of the cylinder. Both end caps are rotatably connected to the main shaft through bearings, and the inner rings of both bearings are fixed to the main shaft, and the outer rings of both bearings are fixed to the corresponding end caps.

[0011] Preferably, the cylinder is provided with an anti-slip sleeve, the outer wall of the cylinder is bonded to the inner wall of the anti-slip sleeve by adhesive, multiple permanent magnets are bonded to the inner wall of the cylinder, a stator assembly is fixed on the main shaft, and a temperature sensor is provided inside the end slot of the stator three-phase winding on the stator assembly.

[0012] Preferably, a plurality of permanent magnets are arranged to form a circular tube, and the circular tube is fitted onto the stator assembly. A mounting bracket is installed on the surface of the spindle, and an encoder is installed on the mounting bracket. A first gear is installed on the inspection end of the encoder, and a mounting ring is fixed on the surface of one of the end covers.

[0013] Preferably, the mounting ring and the mounting bracket are both located inside the cylinder. A second gear is installed on the mounting ring, and the first gear and the second gear are meshed together. Two first sealing rings of different sizes are bonded to the inside of each end cover. A wire hole is pre-set between the other end of the main shaft and the surface of the main shaft.

[0014] Preferably, the inlet of the cooling water channel is connected to a first one-way valve, the inlet end of the first one-way valve is connected to a filter, and both ends of the main shaft are provided with mounting seats and fixing covers. The two ends of the main shaft are respectively fixed between the corresponding mounting seats and the corresponding fixing covers, and the mounting seats and fixing covers are fixed together by bolts.

[0015] Preferably, a second sealing ring is bonded to the inside of the wire hole near the opening. The second sealing ring is used to seal between the cable and the wire hole. A third sealing ring is bonded to the opposite end of each of the two end caps. The first sealing ring is used to seal between the end cap and the main shaft, and the third sealing ring is used to seal between the end cap and the cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting up an auxiliary mechanism, the local temperature rise of the stator assembly can be significantly reduced, the high-temperature demagnetization of the permanent magnet can be alleviated, the heat dissipation efficiency can be low, and the risk of water leakage and electric leakage can be reduced. With the cooperation of the rotating mounting plate, the air inside the space composed of the end cover and the cylinder can be allowed to flow. At the same time, with the cooperation of the cooling plate, the heat conducting plate and the cooling water flowing in the water channel inside the cooling plate, the heat distributed in the space during the operation of the stator assembly can be quickly removed. Then, with the cooperation of the guide block and the drainage groove, the cooling water with heat collected in the drainage groove can be smoothly transported away.

[0017] 2. In this invention, the rotor magnetic pole angle can be calculated by the combination of frequency converter, encoder, first gear, second gear, mounting ring, end cover and internal algorithm of frequency converter. At the same time, the cylinder can be rotated by the interaction between the stator rotating magnetic field in the stator assembly and the rotor permanent magnet. The first sealing ring, second sealing ring and third sealing ring can prevent water vapor and dust in the environment from entering the cylinder.

[0018] 3. In this invention, the entire high-torque permanent magnet variable frequency speed-regulating electric drum can be stably fixed on the frame of the belt conveyor by the cooperation of the mounting base and the fixing cover. By cooperating with the filter, the first one-way valve and the cooling water channel, the incoming cooling water can be filtered and then diverted to each connecting hole. By cooperating with the frequency converter to set the temperature threshold and the temperature sensor, the operation of the drum can be controlled. Attached Figure Description

[0019] Figure 1This is a perspective view of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 2 This is a top view structural diagram of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 3 This is a right-side sectional perspective view of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 4 This is a partial sectional perspective view of the left side of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 5 This is a three-dimensional structural diagram of the cylinder and mounting plate of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 6 This is a three-dimensional structural diagram of the cooling plate, three-way pipe, first check valve, heat insulation pipe and heat conduction plate of a high-torque permanent magnet variable frequency speed regulating electric drum for a high-power belt conveyor according to the present invention. Figure 7 This is a perspective sectional view of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 8 This is a cross-sectional view of the cooling fins and a three-dimensional structural diagram of the heat-conducting fins of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 9 This is a three-dimensional structural diagram of the insulation pipe and guide block of a high-torque permanent magnet variable frequency speed-regulating electric drum for a high-power belt conveyor according to the present invention. Figure 10 This invention relates to a high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors. Figure 7 Enlarged 3D view of the structure at point A in the middle; Figure 11 This invention relates to a high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors. Figure 7 Enlarged 3D view of the structure at point B.

[0020] In the diagram: 1. Roller mechanism; 11. Frequency converter; 12. End cover; 13. Cylinder; 14. Anti-slip sleeve; 15. Permanent magnet; 16. Main shaft; 17. Stator assembly; 18. Mounting bracket; 19. Encoder; 110. First gear; 111. Mounting ring; 112. Second gear; 113. First sealing ring; 114. Wire hole; 115. Cooling water channel; 116. First one-way valve; 117. Filter; 118. Mounting base; 119. Fixing cover; 120. Second sealing ring; 121. Third sealing ring; 2. Auxiliary mechanism; 21. Cooling fin; 22. T-pipe; 23. First check valve; 24. Insulation pipe; 25. Heat-conducting fin; 26. Connecting hole; 27. Mounting plate; 28. Fixing rod; 29. ​​Guide block; 210. Drainage groove; 211. Connecting shell; 212. Second check valve. Detailed Implementation

[0021] Please see Figures 1 to 11 The present invention provides a technical solution: A high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors includes a drum mechanism 1. The drum mechanism 1 includes a frequency converter 11, a drum body 13 and a main shaft 16. Cooling water channels 115 are preset on the main shaft 16, and an auxiliary mechanism 2 is provided on the main shaft 16. The auxiliary mechanism 2 includes multiple cooling plates 21, multiple connecting holes 26, and multiple sets of mounting plates 27. Each cooling plate 21 has a water channel for cooling water transportation. A three-way pipe 22 is connected between two opposite water outlets on each cooling plate 21. A first check valve 23 is connected to the water outlet of each three-way pipe 22. A heat insulation pipe 24 is connected to the water outlet of each first check valve 23. Multiple heat-conducting plates 25 are fixed on the outer wall of each cooling plate 21. The interior of each connecting hole 26 is connected to the interior of the corresponding water channel inlet on the corresponding cooling plate 21. It also includes a fixing rod 28 and a drain groove 210. The fixing rod 28 is used to seal and block the outlet end of the cooling water channel 115. The drain groove 210 is preset at one end of the main shaft 16, and the outlet end of each heat insulation pipe 24 extends into the interior of the drain groove 210.

[0022] Each cooling fin 21 is fixedly sleeved on the spindle 16, the water outlet of each insulation pipe 24 is fixedly penetrated through the surface of the spindle 16, and the water outlet of each insulation pipe 24 is fixedly penetrated through the inner wall of the cooling water channel 115. Each connecting hole 26 is preset in the inner wall of the cooling water channel 115.

[0023] Multiple mounting plates 27 and multiple cooling fins 21 are arranged in an alternating pattern. Multiple guide blocks 29 are fixedly fitted inside the drain trough 210, and each guide block 29 has a reserved water passage hole for the normal transportation of cooling water carrying heat inside the drain trough 210.

[0024] Each mounting plate 27 is installed on the inner wall of the cylinder 13. One end of the main shaft 16 is fixed with a connecting shell 211. The water outlet end of the connecting shell 211 is connected to a second check valve 212. The interior of the connecting shell 211 is connected to the interior of the drainage trough 210.

[0025] By adopting the above technical solution, when the cylinder 13 rotates, the mounting plate 27 connected to it will drive the airflow inside the space formed by the end cap 12 and the cylinder 13, and allow the flowing air (carrying heat) to blow onto the surface of the cooling fins 21 and the surface of the heat-conducting fins 25. Then, the clean cooling water delivered to the cooling water channel 115 is distributed to the water channel reserved in each cooling fin 21 through multiple connecting holes 26. At this time, the heat transferred to the cooling water is carried away by the internal flowing cooling water. Then, the cooling water carrying heat will pass through the three-way pipe. 22. The first check valve 23, the insulation pipe 24 and the guide block 29 work together to transport all the contents into the drainage trough 210, and then stably transport them into the connecting shell 211. After that, they are transported away through the second check valve 212. That is, the heat dissipation method of using metal cooling plates 21 (stationary) with water channels evenly distributed on the main shaft 16, mounting plates 27 (moving) evenly distributed on the cylinder 13, and non-contact with the stator and reserved gaps is adopted to greatly reduce the local temperature rise of the stator assembly 17, alleviate the high temperature demagnetization of the permanent magnet 15, low heat dissipation efficiency and the risk of water leakage and electric leakage.

[0026] Specifically, such as Figures 1-4 and Figure 10 As shown, the cylinder 13 is located on one side of the frequency converter 11, the main shaft 16 is located inside the cylinder 13, and the two ends of the cylinder 13 are respectively connected to end caps 12. Both end caps 12 are rotatably connected to the main shaft 16 through bearings, and the inner rings of the two bearings are fixed to the main shaft 16, and the outer rings of the two bearings are fixed to the corresponding end caps 12.

[0027] An anti-slip sleeve 14 is provided on the cylinder 13. The outer wall of the cylinder 13 and the inner wall of the anti-slip sleeve 14 are connected by adhesive. Multiple permanent magnets 15 are bonded to the inner wall of the cylinder 13. A stator assembly 17 is fixed on the main shaft 16. A temperature sensor is provided inside the end slot of the stator three-phase winding on the stator assembly 17.

[0028] Multiple permanent magnets 15 are arranged to form a circular tube, which is fitted onto the stator assembly 17. A mounting bracket 18 is installed on the surface of the main shaft 16, and an encoder 19 is installed on the mounting bracket 18. A first gear 110 is installed on the inspection end of the encoder 19, and a mounting ring 111 is fixed on the surface of one of the end caps 12.

[0029] The mounting ring 111 and the mounting bracket 18 are both located inside the cylinder 13. A second gear 112 is installed on the mounting ring 111. The first gear 110 and the second gear 112 are meshed together. Two first sealing rings 113 of different sizes are bonded to the inside of each end cover 12. A wire hole 114 is pre-set between the other end of the main shaft 16 and the surface of the main shaft 16.

[0030] A second sealing ring 120 is bonded to the inside of the wire hole 114 near the opening. The second sealing ring 120 is used to seal between the cable and the wire hole 114. A third sealing ring 121 is bonded to the opposite end of each of the two end caps 12. The first sealing ring 113 is used to seal between the end cap 12 and the main shaft 16, and the third sealing ring 121 is used to seal between the end cap 12 and the cylinder 13.

[0031] By adopting the above technical solution, when in use, the inverter (model: GD200A-110G / 132P-4) 11 outputs low-frequency high-voltage three-phase AC power to the stator winding in the stator assembly 17. At the same time, the rotor magnetic pole angle is calculated by the encoder (model: E6B2-CWZ6C) 19, the first gear 110, the second gear 112, the mounting ring 111, the end cover 12, and the internal algorithm of the inverter 11. Then, the rotating magnetic field of the stator in the stator assembly 17 interacts with the rotor permanent magnet 15 to drive the cylinder 13 to rotate at a low speed until the rotation speed of the cylinder 13 reaches the preset initial speed. Then, by using the rotating cylinder 13, the auxiliary transmission roller on the belt conveyor, and the conveyor belt on the belt conveyor, the material placed on the conveyor belt can be transported away. When the inverter 11 collects the temperature data of the stator assembly 17, the cavity environment (composed of end cover 12 and cylinder 13), and the permanent magnet 15 in real time through the temperature sensor inside the end slot of the stator three-phase winding on the stator assembly 17, and any temperature value exceeds the preset temperature threshold of the inverter 11 (temperature range of 85–105℃, which needs to match the demagnetization temperature of the permanent magnet 15 and the insulation heat resistance level of the stator winding on the stator assembly 17), the inverter 11 will immediately start the over-temperature trip shutdown protection program. That is, it will first cut off the three-phase variable frequency AC power output to the stator winding on the stator assembly 17, so that the rotating magnetic field of the stator assembly 17 disappears instantly, and the electromagnetic torque returns to zero synchronously. The cylinder 13 will continue to drive the conveyor belt to rotate under the inertia of the conveyor belt and the material. However, due to the loss of power input and the combined effect of the friction of the conveyor belt, the bearing resistance, and the material resistance, the rotation speed of the cylinder 13 will continue to gradually decrease until it stops completely. When all temperature data collected by inverter 11 are lower than the preset temperature threshold of inverter 11, and there are no other fault alarm signals in the equipment, and at the same time a normal shutdown command (not an emergency shutdown signal) is received from the PLC controller of the belt conveyor, inverter 11 will execute a smooth shutdown control program. That is, by gradually reducing the output frequency and output voltage, the output torque is reduced synchronously, so that the speed of the drum 13 can be slowly reduced according to the preset deceleration curve. During this process, inverter 11 will continuously monitor the actual speed of drum 13 (through data feedback from encoder 19) and dynamically adjust the output parameters to ensure that the speed of drum 13 decreases smoothly until the speed of drum 13 approaches zero speed (value range ≤0.5r / min). At this time, the braking device on the belt conveyor can also be triggered to lock drum 13 to complete the entire normal shutdown process according to the working conditions.

[0032] Specifically, such as Figures 1-4 , Figure 7 , Figure 10 and Figure 11 As shown, the inlet of the cooling water channel 115 is connected to a first one-way valve 116, and the inlet of the first one-way valve 116 is connected to a filter 117. Both ends of the main shaft 16 are provided with mounting seats 118 and fixing covers 119. The two ends of the main shaft 16 are respectively fixed between the corresponding mounting seats 118 and the corresponding fixing covers 119. The mounting seats 118 and the fixing covers 119 are fixed together by bolts.

[0033] By adopting the above technical solution, the incoming cooling water can be filtered through the filter 117. After filtration, the cooling water will be transported to the interior of the cooling water channel 115 through the first one-way valve 116, and then continue to the next step. At the same time, with the cooperation of the fixing rod 28, it can be ensured that the cooling water in the cooling water channel 115 enters the water channel reserved in each cooling fin 21 for the next step.

[0034] Before use, directly use the mounting base 118 and the fixing cover 119 to install the entire high-power belt conveyor with a high-torque permanent magnet variable frequency speed-regulating electric roller onto the belt conveyor frame. Then, install the prepared auxiliary drive roller onto the belt conveyor frame. Next, install the conveyor belt between the anti-slip sleeve 14 and the auxiliary drive roller. Then, install the frequency converter 11 onto the belt conveyor frame. Once the belt conveyor is assembled, directly connect the frequency converter 11 to the power supply equipment via a cable, and then power on and start the frequency converter 11 to begin operation. After the self-test is normal, set the two temperature thresholds (one is the initial temperature, which is determined according to the actual situation, and the other is the over-temperature trip and shutdown) and multiple speed values ​​and corresponding frequency, torque and other parameters directly through the control buttons on the frequency converter 11. Then connect the output end of the water pipe that delivers cooling water to the input end of the filter 117, and connect the input end of the water pipe that delivers the used cooling water to the output end of the second check valve 212. At the same time, electrically connect the frequency converter 11 to the PLC controller of the belt conveyor. In use, the PLC controller of the belt conveyor sends a start command to the frequency converter 11. Upon receiving the command, the frequency converter 11 outputs low-frequency, high-voltage three-phase AC power to the stator winding in the stator assembly 17. At the same time, the frequency converter 11, through its internal algorithm and the position pulse signal output by the encoder 19, accurately calculates the rotor magnetic pole angle, thereby achieving precise control of the phase of the stator rotating magnetic field in the stator assembly 17. Subsequently, through the interaction between the stator rotating magnetic field in the stator assembly 17 and the rotor permanent magnet 15, the cylinder 13 is driven to overcome the static friction of the conveyor belt and the inertia of the material, starting from a stationary state and rotating at a low speed until the speed of the cylinder 13 reaches the preset initial speed. Meanwhile, when the cylinder 13 starts to rotate, the mounting plate 27 installed on its inner wall allows the air inside the space formed by the end cap 12 and the cylinder 13 (the heat generated by the stator assembly 17 during operation is also distributed into this space) to flow towards the cooling fins 21, that is, to allow the flowing air to contact the surface of the cooling fins 21 and the surface of the heat-conducting fins 25. Then, the water pipes that deliver cooling water deliver cooling water to the inside of the filter 117. After being filtered by the filter 117, the cooling water is first delivered to the inside of the first one-way valve 116, and then to the inside of the cooling water channel 115. After that, the clean cooling water delivered to the cooling water channel 115 is delivered to the internal water channel of each cooling fin 21 through multiple connecting holes 26. When the clean cooling water passes through the internal water channel of the cooling fin 21, the cooling water will remove the air inside the space. The heat (which is transferred to the cooling water flowing in the cooling plate 21 through the cooling plate 21 and the heat conduction plate 25) is carried away, thus solving various potential faults such as low heat dissipation efficiency, water leakage, electric leakage, local overheating, and high temperature demagnetization of permanent magnet 15 during long-term operation of high-torque permanent magnet variable frequency speed control electric drum of high power belt conveyor. Then, the cooling water with heat is first delivered to the corresponding three-way pipe 22, then to the corresponding first check valve 23, and then to the insulation pipe 24. Next, the cooling water with heat in all the insulation pipes 24 is smoothly delivered to the drainage tank 210 through the corresponding guide block 29. Then, the cooling water with heat in the drainage tank 210 is delivered to the connecting shell 211, and then through the second check valve 212, it is delivered to the water pipe of the used cooling water, and then it is transported away. Meanwhile, the temperature sensor inside the end slot of the stator three-phase winding in the stator assembly 17 will also collect the operating temperature of the stator assembly 17 in real time, and then transmit the collected temperature data to the frequency converter 11. When the temperature exceeds the preset temperature threshold of the frequency converter 11 (the over-temperature trip and shutdown temperature value preset by the frequency converter 11), the frequency converter 11 will cut off the power supply. At this time, the stator winding in the stator assembly 17 will immediately stop receiving the frequency converter AC power, and then the rotating magnetic field will disappear instantly, the electromagnetic torque will return to zero synchronously, and then the cylinder 13, which has lost the electromagnetic torque drive, will continue to drive the conveyor belt under the action of inertia. The cylinder rotates, but the speed gradually decreases. When the temperature does not exceed the preset temperature threshold of the inverter 11 and a stop command is received from the PLC controller on the belt conveyor, the inverter 11 will gradually reduce the output frequency, causing the cylinder 13 speed to decrease slowly. At the same time, the output torque will also decrease. When the cylinder 13 speed drops to near zero, the braking device on the belt conveyor will lock the cylinder 13 to achieve precise stopping. At this time, the cooling water will continue to be supplied for 5-10 minutes until the temperature of the stator assembly 17 drops to the initial temperature (the initial temperature value preset by the inverter 11), and then the cooling water supply will be stopped.

[0035] The second sealing ring 120 is used to seal between the cable and the wire hole 114. The "cable" is used for electrical connection between the encoder 19, the frequency converter 11, the temperature sensor (pre-embedded in the end slot of the stator three-phase winding in the stator assembly 17) and the stator assembly 17.

[0036] The rotational speed of the cylinder 13 is determined by the combination of the encoder 19, the first gear 110, the second gear 112, the mounting ring 111, the end cover 12, and the frequency converter 11. The formula for the rotational speed of the cylinder 13 is as follows: , The actual rotational speed of the electric drum 13 (unit: r / min). The pulse frequency (in Hz) output by encoder 19 in real time. The number of teeth of the first gear 110 connected to the encoder 19. This refers to the number of pulses per revolution of encoder 19 (a factory-fixed parameter). The number of teeth of the second gear 112, which is connected to the end cover 12 (which rotates synchronously with the cylinder 13) and meshes with the first gear 110.

[0037] In summary, in practical use, this invention allows airflow within the space formed by the end cap and the cylinder through the mounting plate 27. Simultaneously, the cooling fins 21 and heat-conducting fins 25 work together to allow cooling water passing through the pre-reserved channels in the cooling fins 21 to carry away heat from the space, thereby alleviating the demagnetization of the permanent magnet 15 due to high temperatures. It also reduces the local temperature rise of the stator assembly 17, improving heat dissipation efficiency. Furthermore, the first sealing ring 113, the second sealing ring 120, and the third sealing ring 121 work together to prevent moisture from entering the cylinder 13. The cooling fins 21 and the main... The fixed connection of shaft 16 can prevent the risk of water leakage and electric leakage when the cooling water in the cooling water channel 115 enters the water channel reserved in the cooling plate 21 through the connecting hole 26. Through the cooperation of frequency converter 11, encoder 19 and internal algorithm of frequency converter 11, and by utilizing the interaction between the stator rotating magnetic field in stator assembly 17 and rotor permanent magnet 15, the cylinder 13 can be rotated. Through the cooperation of filter 117 and first one-way valve 116, the delivered cooling water can be filtered and delivered to the cooling water channel 115 for the cooling water required by the cooling plate 21 later.

Claims

1. A high-torque permanent magnet variable frequency speed-regulating electric roller for a high-power belt conveyor, comprising a roller mechanism (1), characterized in that: The roller mechanism (1) includes a frequency converter (11), a cylinder (13) and a main shaft (16). A cooling water channel (115) is pre-set on the main shaft (16), and an auxiliary mechanism (2) is provided on the main shaft (16). The auxiliary mechanism (2) includes multiple cooling plates (21), multiple connecting holes (26) and multiple sets of mounting plates (27). Each cooling plate (21) has a water channel for cooling water transportation. A three-way pipe (22) is connected between two opposite water outlets on each cooling plate (21). A first check valve (23) is connected to the water outlet of each three-way pipe (22). A heat insulation pipe (24) is connected to the water outlet of each first check valve (23). Multiple heat-conducting plates (25) are fixed on the outer wall of each cooling plate (21). The interior of each connecting hole (26) is connected to the interior of the corresponding water channel inlet on the corresponding cooling plate (21). It also includes a fixing rod (28) and a drain groove (210), the fixing rod (28) being used to seal and block the outlet of the cooling water channel (115), the drain groove (210) being pre-set at one end of the main shaft (16), and the outlet of each of the heat insulation pipes (24) extending into the interior of the drain groove (210).

2. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 1, characterized in that: Each of the cooling plates (21) is fixedly sleeved on the main shaft (16), the water outlet of each of the insulation pipes (24) is fixedly penetrated through the surface of the main shaft (16), and the water outlet of each of the insulation pipes (24) is fixedly penetrated through the inner wall of the cooling water channel (115). Each of the connecting holes (26) is preset in the inner wall of the cooling water channel (115).

3. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 1, characterized in that: Multiple mounting plates (27) and multiple cooling plates (21) are arranged in an alternating pattern. Multiple guide blocks (29) are fixedly fitted inside the drainage trough (210), and each guide block (29) has a reserved water passage hole for the normal transport of cooling water carrying heat inside the drainage trough (210).

4. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 1, characterized in that: Each of the mounting plates (27) is installed on the inner wall of the cylinder (13). One end of the main shaft (16) is fixed with a connecting shell (211). The water outlet end of the connecting shell (211) is connected to a second check valve (212). The interior of the connecting shell (211) is connected to the interior of the drainage groove (210).

5. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 1, characterized in that: The cylinder (13) is located on one side of the frequency converter (11), the main shaft (16) is located inside the cylinder (13), and the two ends of the cylinder (13) are respectively connected to end caps (12). Both end caps (12) are rotatably connected to the main shaft (16) through bearings, and the inner rings of the two bearings are fixed to the main shaft (16), and the outer rings of the two bearings are fixed to the corresponding end caps (12).

6. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 5, characterized in that: The cylinder (13) is provided with an anti-slip sleeve (14). The outer wall of the cylinder (13) and the inner wall of the anti-slip sleeve (14) are bonded together with glue. Multiple permanent magnets (15) are bonded to the inner wall of the cylinder (13). A stator assembly (17) is fixed on the main shaft (16). A temperature sensor is provided inside the end slot of the stator three-phase winding on the stator assembly (17).

7. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 6, characterized in that: Multiple permanent magnets (15) are arranged to form a circular tube, and the circular tube is fitted on the stator assembly (17). A mounting bracket (18) is installed on the surface of the main shaft (16), and an encoder (19) is installed on the mounting bracket (18). A first gear (110) is installed on the inspection end of the encoder (19), and a mounting ring (111) is fixed on the surface of one of the end caps (12).

8. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 7, characterized in that: The mounting ring (111) and the mounting bracket (18) are both located inside the cylinder (13). A second gear (112) is installed on the mounting ring (111). The first gear (110) and the second gear (112) are meshed together. Two first sealing rings (113) of different sizes are bonded to the inside of each end cap (12). A wire hole (114) is pre-set between the other end of the main shaft (16) and the surface of the main shaft (16).

9. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 1, characterized in that: The inlet of the cooling water channel (115) is connected to a first one-way valve (116), and the inlet of the first one-way valve (116) is connected to a filter (117). Both ends of the main shaft (16) are provided with mounting seats (118) and fixing covers (119). The two ends of the main shaft (16) are respectively fixed between the corresponding mounting seats (118) and the corresponding fixing covers (119). The mounting seats (118) and the fixing covers (119) are fixed together by bolts.

10. The high-torque permanent magnet variable frequency speed-regulating electric drum for high-power belt conveyors according to claim 8, characterized in that: A second sealing ring (120) is bonded to the inside of the wire hole (114) near the opening. The second sealing ring (120) is used to seal between the cable and the wire hole (114). A third sealing ring (121) is bonded to the opposite end of each of the two end caps (12). The first sealing ring (113) is used to seal between the end cap (12) and the main shaft (16). The third sealing ring (121) is used to seal between the end cap (12) and the cylinder (13).

Images