A follow-up drive motor on a permanent magnet direct-drive ball mill

Abstract

The present invention discloses a follow-up drive motor for a permanent magnet direct-drive ball mill, comprising a ball mill drum, a stator power mechanism, a rotor power mechanism, a support frame and a rotating drum. The stator power mechanism is connected to the centripetal inner side of the support frame, the stator power mechanism comprises a stator silicon steel sheet, a coil, a stator shell, a guide wheel and an elastic pressure device; the rotor power mechanism comprises a rotor silicon steel sheet, a permanent magnet and a magnetic isolation aluminum plate; the rotor power mechanism is arranged on the outer surface of the rotating drum, the ball mill drum is arranged on the inner surface of the rotating drum, the guide wheel is arranged between the centripetal inner surface of the stator shell and the rotating drum, the elastic pressure device is arranged between the support frame and the centripetal outer surface of the stator shell, and the stator power mechanism and the rotor power mechanism constitute a follow-up drive motor; the structural design is novel, and the gap between the stator iron core and the rotor iron core can be controlled to be constant, so that the gap is designed to be very small, the amount of permanent magnets used is reduced, and the manufacturing cost of the motor is reduced, while the influence of the eccentricity of the motor rotor is greatly reduced or avoided, and the operation is stable. It subverts the traditional concept and enables the motor to operate normally even when it rotates eccentrically, eliminating the need for frequent correction of the gap between the stator core and the rotor core, and the need for frequent maintenance and replacement of bearings. It also eliminates the need to shut down the machine for maintenance after eccentricity occurs, resulting in longer continuous working time, reduced maintenance times, and improved production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ball mill drive motors, in particular to a follower drive motor on a permanent magnet direct-drive ball mill. Background Art

[0002] A ball mill is a device for crushing materials. Its basic principle is to use the rotational force to lift the steel balls in the drum to a certain height and drop them to hit the materials. The materials are crushed through the contact between the steel balls and the materials. The existing ball mills require a complicated transmission mechanism. The traditional ball mill uses the motor output shaft to drive the small gear through the reducer, and the small gear drives the large gear to drive the drum to rotate. The Chinese patent application number is 201610640563.6, which discloses a permanent magnet synchronous motor direct-driven energy-saving ball mill, which has a rotating drum with a feed shaft and a discharge end at both ends respectively. The rotating drum is sleeved in a sliding bearing, and the sliding bearing is placed on a bearing support frame. A ring-shaped motor is sleeved on the surface of the rotating drum, and the ring-shaped motor is placed on a motor bracket. The ring-shaped motor includes a casing, a stator and a rotor. The casing is fixed to the motor bracket. A stator core and a stator winding are arranged in the stator. The stator is fixedly arranged inside the casing. The rotor is a permanent magnet pole fixedly connected to a pole bracket, and the pole bracket is fixedly arranged on the outer shell of the rotating drum; the permanent magnet pole is directly installed on the surface of the rotating drum, and the rotating drum is directly driven by the ring motor. All complicated transmission mechanisms are eliminated, the operation is more stable, there is no transmission loss, and the floor space is smaller. More ball mills can be equipped in the same factory, which is conducive to improving production efficiency and energy conservation and emission reduction. However, due to the large diameter of the ball mill drum, using the drum as the rotor for a permanent magnet direct-drive motor can cause deformation during mechanical manufacturing, material processing, and assembly. The excessive length and weight of the ball mill itself, coupled with play and wear in the support system, can cause eccentric swing during operation. This eccentricity creates an uneven gap between the motor's stator and rotor cores, generating vibration and noise, increased losses, and increased temperature rise. In severe cases, the stator and rotor cores can contact, causing bore swabbing and damaging the motor. Therefore, the only way to prevent bore swabbing during manufacturing is to increase the gap between the rotor and stator, requiring frequent machine stops for gap adjustment. However, increasing the gap between the stator and rotor of a direct-drive permanent magnet motor increases the amount of permanent magnets required, further increasing costs. Therefore, there is an urgent need for improved technologies to address these issues. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a follow-up drive motor for a permanent magnet direct-drive ball mill. The structure is novel and can control the gap between the stator core and the rotor core to be constant, so that the gap is designed to be very small, reduce the amount of permanent magnets used, reduce the manufacturing cost of the motor, and at the same time greatly reduce or avoid the influence of the eccentricity of the motor rotor, and run smoothly. Subverting the traditional concept, the motor can still run normally when it rotates eccentrically, eliminating the need for frequent correction of the gap between the stator core and the rotor core, and eliminating the need for frequent maintenance and replacement of bearings. There is no need to stop the machine for maintenance after eccentricity occurs, and the continuous working time is longer, which reduces the number of maintenance times and improves production efficiency. It can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a follower drive motor for a permanent magnet direct-drive ball mill, comprising a ball mill drum, a stator power mechanism, a rotor power mechanism, a support frame, and a rotating drum. The stator power mechanism is connected to the centripetal inner side of the support frame and comprises stator silicon steel sheets, a coil, a stator housing, a guide pulley, and an elastic pressure device. The rotor power mechanism comprises rotor silicon steel sheets, permanent magnets, and a magnetic isolation aluminum plate. The rotor power mechanism is disposed on the outer surface of the drum, the ball mill drum is disposed on the inner surface of the drum, the guide wheel is disposed between the centripetal inner surface of the stator housing and the drum, and the elastic pressure device is disposed between the support frame and the centripetal outer surface of the stator housing. The stator power mechanism and the rotor power mechanism constitute a follower drive motor. The permanent magnets and rotor silicon steel sheets are evenly distributed around the drum axis. When the motor is energized, the rotor power mechanism is driven to rotate the drum. When the ball mill drum is eccentric, several independent follower drive motors flexibly follow the drum in the circumferential and radial directions. The rolling guide wheels of the follower drive motors constantly control the gap between the stator and rotor of the motor. As long as the motor does not sweep the bore, the smaller the gap between the stator and rotor, the less permanent magnets are used, the lower the motor manufacturing cost, the higher the efficiency, and the more significant the energy saving effect. By disposing several modular follower drive motors on the outer surface of the rotor structure, which is screwed to the outer periphery of the eccentric or vibrating drum, the follower drive motors move in accordance with the drum vibration, ensuring a constant gap between the stator and rotor, thereby achieving smooth operation.

[0005] Furthermore, the support frame is assembled in a splicing manner, and the support frame is installed on a pre-buried foundation in contact with the ground by screwing. The splicing manner of the support frame is convenient for transportation, and the outer periphery of the support frame and the two side surfaces are movably sealed to prevent dust and water from affecting the internal drive motor.

[0006] Furthermore, the elastic pressure device includes a connecting rod, a fixed screw, an adjusting nut, and a pressure spring. Several bosses are welded along the circumference of the inner side of the support frame, and several small support members are screwed onto the bosses. The small support members support the connecting rod and the elastic pressure device. A concave cavity is provided on the stator housing, and the lower end of the connecting rod is inserted into the concave cavity through the small support member for fixation. The fixed connection plate at the upper end of the connecting rod is provided with a through hole, and multiple fixed screws pass through the through hole of the connection plate and are screwed to the small support frame. An adjusting nut is installed above the fixed screw, and a pressure spring is provided between the adjusting nut and the fixed connection plate of the connecting rod. The adjusting nut serves to adjust the radial pressure of the drive motor.

[0007] Furthermore, the assembly position of the elastic pressure device is preferably assembled on the circumferential surface of the support frame, and the pressure spring is preferably a disc spring.

[0008] Furthermore, the elastic pressure device is installed between the stator housing and the support frame without affecting the disassembly of the stator power mechanism. It can be installed in the middle above the stator housing or on both sides above the stator housing. That is, the elastic pressure device structure is arranged on the centripetal outer side of each stator housing and within the support frame, and can be distributed at different positions on the inner circumference of the support frame.

[0009] Furthermore, a guide wheel fixing seat is fixed to the centripetal inner surface of the stator shell, and the guide wheel is installed on the guide wheel fixing seat. The guide wheel contacts the outer surface of the rotating drum. A single stator power mechanism is provided with four guide wheels, and the guide wheels are arranged at four centripetal corner positions of the follow-up drive motor chassis to ensure stability. The guide wheel mechanism includes a guide wheel fixing seat, a pin shaft, and a bearing. The distance between the centripetal outer arc surface of the guide wheel fixing seat and the centripetal inner surface of the stator shell can be adjusted. The guide wheel can be adjusted during initial assembly and can also be adjusted after subsequent guide wheel wear. After the distance is adjusted, the positioning is screwed, and the guide wheel of the follow-up drive motor rolls at a constant distance to contact the outer surface of the rotating drum screwed to the outer periphery of the drum, ensuring that the gap between the stator core and the rotor core remains unchanged. The gap can be designed to be smaller and the chamber sweeping phenomenon will not occur to damage the motor. The smaller the gap, the less permanent magnets are used in the motor, the higher the efficiency, the more energy-saving the motor, and the lower the cost.

[0010] Furthermore, the follow-up drive motor adopts a modular design, and the stator power mechanism is independently installed on the circumference of the rotating drum, with its own independent sector block shell mechanical structure, silicon steel sheet, water cooling pipe, coil, test system and independent elastic pressure device.

[0011] Furthermore, the support frame is fixedly provided with blocks at both circumferential ends of each follow-up drive motor along the circumferential direction, and the contact surface between the block and the stator power mechanism is equipped with rubber blocks. The function of the block is to limit the range of movement of the stator power mechanism, and to block the torque of the drive motor running in the circumferential direction when the drive motor rotates forward or reverse, thereby protecting adjacent stator silicon steel sheets from collision and deformation.

[0012] Furthermore, stoppers may be further provided in the axial and circumferential radial directions of the support frame to provide position limiting protection for the stator power mechanism in all directions.

[0013] Furthermore, the stator punchings of each stator module are stacked and tightened separately, compressed and fixed by an arc-shaped stator pressure ring, and a small-span coil is embedded in the stator slot. At the same time, the stator winding is insulated and tied. The manufactured stator module is varnished and dried as a whole to complete the production and packaging of each module. Each stator module is installed and fixed on the fan-shaped stator housing, and a guide wheel and an elastic pressure device are added. They are distributed and installed in the support frame to form a follow-up drive motor with the rotor power mechanism, and are debugged and operated separately or as a whole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This invention overturns the traditional concept, allowing the motor to operate normally even when it rotates eccentrically. The traditional concept is that eccentricity requires correction or maintenance. This invention eliminates the need for frequent correction of the gap between the stator core and the rotor core, and the need for frequent maintenance and replacement of bearings. The bearings can still be used even if they are severely worn, and it does not affect the motor efficiency. Unlike traditional motors, there is no need to shut down for maintenance after eccentricity occurs. The continuous working time is longer, and the mill is large and difficult to repair. Reducing the number of repairs means improving production efficiency.

[0016] 2. The present invention is provided with a follow-up drive motor, and the gap between the stator and the rotor of the motor is controlled at a constant distance by the rolling guide wheel of the follow-up drive motor. As long as the motor is running without sweeping the barrel, the smaller the gap between the stator and the rotor, the higher the motor efficiency, the more obvious the power saving effect, the lower the motor manufacturing cost, and the drive motor itself releases the amplitude to achieve the purpose of smooth operation.

[0017] 3. The present invention is provided with an elastic pressure device. The pressure spring of the elastic pressure device is in a semi-compressed state when the ball mill drum is not eccentric. If the ball mill drum fluctuates upward, the drum will push up the guide wheel on the stator power mechanism of the follower drive motor, thereby driving the stator power mechanism upward. The upper pressure spring continues to compress, and the pressure spring on the lower stator power mechanism pushes the lower stator power mechanism upward, ensuring that the guide wheel of the lower stator power mechanism remains in contact with the outer surface of the drum, thereby ensuring that the gap between the stator and rotor remains unchanged. If the ball mill drum returns to its original position or continues to fluctuate downward, the pressure spring of the upper stator power mechanism presses the upper stator power mechanism downward, and the lower stator power mechanism is pressed downward by the drum. This ensures that the gap between the stator core and the rotor core remains unchanged when the motor vibrates eccentrically. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the partial structure of the rotor power mechanism of the present invention;

[0020] Figure 3 It is a schematic side view of the rotor power mechanism and a single stator power mechanism structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the elastic device in a single stator power mechanism of the present invention.

[0022] In the figure: 1 ball mill drum, 2 stator power mechanism, 3 elastic pressure device, 4 support frame, 5 rotor power mechanism, 6 drum, 7 adjusting nut, 8 pressure spring, 9 connecting rod, 10 fixed screw, 11 concave cavity, 12 guide wheel fixing seat, 13 guide wheel, 14 follow-up drive motor, 15 connecting hole, 16 magnetic isolation aluminum plate, 17 rotor silicon steel sheet, 18 stator silicon steel sheet, 19 coil, 20 water cooling pipe, 21 stator housing, 22 permanent magnet, 23 block, 24 small support member. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] The present invention is described in detail with reference to the accompanying drawings to provide a technical solution: a follow-up drive motor for a permanent magnet direct-drive ball mill, comprising a ball mill drum 1, a stator power mechanism 2, a rotor power mechanism 5, a support frame 4, and a drum 6; the stator power mechanism is connected to the centripetal inner side of the support frame, and the stator power mechanism comprises a stator silicon steel sheet 18, a coil 19, a stator housing 21, a guide wheel 13, and an elastic pressure device 3. The rotor power mechanism comprises a rotor silicon steel sheet 17, a permanent magnet 22, and a magnetic isolation aluminum plate 16. The rotor power mechanism is arranged on the outer surface of the drum, and the drum is provided with a connection hole 15 for flange mounting of the ball mill drum. The guide wheel is arranged between the centripetal inner surface of the stator housing and the drum, and the elastic pressure device is arranged between the support frame and the centripetal outer surface of the stator housing. The stator power mechanism and the rotor power mechanism constitute a follow-up drive motor 14, and the permanent magnets and rotor silicon steel sheets of the rotor power mechanism are evenly distributed around the drum shaft; when the motor is energized, the rotor power mechanism is driven to drive the drum to rotate, and in the eccentric state of the ball mill drum, In the state, several independent follow-up drive motors flexibly follow the circumferential and radial directions. The gap between the stator and the rotor of the motor is controlled at a constant distance by the rolling guide wheel of the follow-up drive motor. As long as the motor does not sweep the bore during operation, the smaller the gap between the stator and the rotor, the higher the motor efficiency, the more obvious the power saving effect, and the lower the motor manufacturing cost. By arranging several modular follow-up drive motors on the outer surface of the rotor structure screwed to the outer periphery of an eccentric or vibrating drum, the follow-up drive motor moves with the vibration of the drum, ensuring that the gap between the stator core and the rotor core remains unchanged, so as to achieve the purpose of smooth operation.

[0025] The support frame is assembled using a splicing method and is screwed onto a pre-buried foundation in contact with the ground. The splicing method of the support frame facilitates transportation. The outer periphery of the support frame is movably sealed on both sides to prevent dust and water from affecting the internal drive motor. The elastic pressure device is connected to the support frame at one end and to the stator housing of the drive motor at the other end. The elastic pressure device includes a connecting rod 9, a fixed screw 10, an adjustment nut 7, and a pressure spring 8. Several bosses are welded to the inner side of the support frame, and several small support members 24 are screwed onto the bosses. The small support members support the connecting rod and the elastic pressure device. The stator housing is provided with a cavity 11. The lower end of the connecting rod is inserted into the cavity through the small support member for fixation. The fixed connection plate at the upper end of the connecting rod is provided with a through hole. Multiple fixed screws pass through the connection plate through the through hole and are screwed to the small support frame. An adjustment nut is installed above the fixed screw. A pressure spring is provided between the adjustment nut and the fixed connection plate of the connecting rod. The adjustment nut serves to adjust the radial pressure of the drive motor. The assembly position of the elastic pressure device is preferably installed on the circumferential surface of the support frame, and the pressure spring is preferably a disc spring. The elastic pressure device is used to buffer and consume the amplitude transmitted to the drive motor when the drum rotates, and also release the amplitude from the drum; the elastic pressure device structure is set on the centripetal outside of each driving stator shell and inside the support frame, distributed at different parts of the inner circumference of the frame, and each pressure device has a different position in the annular support frame and a different pressure setting; for example: when the frame is directly above, due to the weight of the stator power mechanism itself and the attraction of the permanent magnet, the elastic pressure can be set smaller. The frame is set directly below, and due to the sinking of the weight of the stator power mechanism itself, the elastic pressure in the pressure device should be increased accordingly.

[0026] The elastic pressure device is installed between the stator housing and the support frame and does not affect the disassembly of the stator power mechanism. It can be installed in the middle above the stator housing or on both sides above the stator housing. That is, the elastic pressure device structure is arranged on the centripetal outer side of each stator housing and within the support frame, and can be distributed at different positions on the inner circumference of the support frame.

[0027] A guide wheel is arranged between the centripetal inner surface of the stator shell of the follow-up drive motor and the rotating drum, and an elastic pressure device is arranged between the centripetal outer surface of the stator shell and the supporting frame. When the motor is energized, the stator power mechanism drives the rotor power mechanism to drive the rotating drum and the roller to rotate. When the roller is eccentric, several independent drive motors flexibly follow the circumference and radial direction. The guide wheel of the drive motor controls the gap between the motor stator and the rotor by constant rolling, which can control the gap to a minimum. The follow-up drive motor adopts a modular design, factory-based assembly line production, transportation, on-site assembly, and subsequent replacement is convenient. Several structurally independent follow-up drive motors on the rotating drum have their own independent sector block shell mechanical structure, silicon steel sheet, cooling system, coil, test system and independent elastic pressure system.

[0028] A guide wheel fixing seat 12 is fixed on the inner side surface of the stator shell, and the guide wheel is installed on the guide wheel fixing seat. The guide wheel contacts the outer surface of the rotating drum. A single stator power mechanism is provided with four guide wheels, and the guide wheels are arranged at four centripetal corner positions of the follow-up drive motor chassis to ensure stability. The guide wheel mechanism includes a guide wheel fixing seat, a pin shaft, and a bearing. The distance between the centripetal outer arc surface of the guide wheel fixing seat and the centripetal inner surface arc surface of the stator shell can be adjusted. The guide wheel can be adjusted during initial assembly and can also be adjusted after subsequent guide wheel wear. After the distance is adjusted, the positioning screw connection is performed, and the guide wheel of the follow-up drive motor rolls at a constant distance to contact the outer surface of the rotating drum screwed to the outer periphery of the drum, so as to ensure that the gap between the stator core and the rotor core remains unchanged, so that the gap can be designed to be smaller and the sweeping phenomenon will not occur to damage the motor. The smaller the gap, the less permanent magnets are used in the motor, the higher the motor efficiency, the more energy-saving the motor, and the lower the cost.

[0029] The follow-up drive motor adopts a modular design, and the stator power mechanism is independently installed on the circumference of the drum. It has its own independent sector block shell mechanical structure, silicon steel sheet, water cooling pipe 20, coil, test system and independent elastic pressure device.

[0030] The support frame is arranged along the circumferential direction, and blocks 23 are fixedly provided at both circumferential ends of each follow-up drive motor. The function of the blocks is to limit the range of motion of the stator power mechanism, to block the torque of the drive motor running in the circumferential direction when the drive motor rotates forward or reverse, and to protect the adjacent stator silicon steel sheets from collision and deformation. Blocks can continue to be provided in the axial and circumferential radial directions of the support frame to limit the stator power mechanism from all directions. The contact surface between the block and the stator power mechanism is equipped with rubber blocks or other materials to reduce the noise generated in the event of a collision. Several small circular holes are opened on one side of the support frame to facilitate the routing of the water pipes and winding outlet wires of each drive motor.

[0031] The stator punchings of each stator module are stacked and tightened separately, compressed and fixed by an arc-shaped stator pressure ring, and small-span coils are embedded in the stator slots. At the same time, the stator winding is insulated and tied. The manufactured stator module is varnished and dried as a whole to complete the production and packaging of each module. Each stator module is installed and fixed on the fan-shaped stator housing, and is equipped with a guide wheel and an elastic pressure device. It is distributed and installed in the support frame to form a follow-up drive motor with the rotor power mechanism, and is debugged and operated separately or as a whole.

[0032] The water cooling system can be installed around the outer periphery of the drive motor's silicon steel laminations. Semicircular grooves are excavated axially, and repeated S-shaped, seamless copper pipes are placed. The pipe inlets and outlets are connected to the outer periphery of the drive motor and connected to soft, high-pressure water pipes. Alternatively, a traditional water tank can be installed on the centripetal outer side of the stator housing, which holds the stator silicon steel laminations. A key feature of this system is that the external water pipes connecting the water cooling system's inlet and outlet must be flexible, such as soft, high-pressure water pipes, to ensure that the water cooling system pipes do not interfere with or become damaged by the movement of the stator drive mechanism.

[0033] The inverter is used to control the stator winding of the drive motor. The stator winding consists of multiple short-pitch independent sub-windings arranged on the stator. The three-phase terminals of each sub-winding are connected to the terminals in the terminal box on the casing. The terminal output ends of the terminal box connected to the sub-winding are led out through the frame through-holes and electrically connected to the inverter respectively. The design of the low-voltage coil and winding solves the problem of using high-priced high-voltage inverters and low cost-effectiveness when high-voltage AC motors are used as the main drive motors of mechanical equipment. It also overcomes the high-current contactor control problem existing in low-voltage and high-power AC motors. It avoids the current level and cooling difficulties when low-voltage and high-power AC motors are powered by low-voltage and high-power inverters.

[0034] Several drive motors are evenly arranged in a circle within the support frame. After all the drive motors are assembled, the outer surface and two side surfaces of the frame are closed. The blower blows air into the drive motor. The air volume is blown out from the circumferential gap between the stator and the drum under positive pressure, which not only cools the inside of the drive motor but also seals the drive motor from external dust, water, and iron grains.

[0035] During use: the pressure spring of the elastic pressure device is in a semi-compressed state when the ball mill drum is not eccentric. If the ball mill drum fluctuates upward, the drum will push up the guide wheel on the stator power mechanism of the follower drive motor, thereby driving the stator power mechanism to move upward, and the upper pressure spring continues to compress. At the same time, the pressure spring on the lower stator power mechanism pushes the lower stator power mechanism upward to ensure that the guide wheel of the lower stator power mechanism still fits the outer surface of the drum, thereby ensuring that the gap between the stator and the rotor remains unchanged. If the ball mill drum resets downward or continues to fluctuate downward, the pressure of the upper stator power mechanism will be reduced. The spring presses the upper stator power mechanism downward, and the lower stator power mechanism is pressed downward by the rotating drum; the gap between the stator and the rotor of the motor is controlled by the rolling guide wheel of the follow-up drive motor at a constant distance. As long as the motor is running without sweeping the bore, the smaller the gap between the stator and the rotor, the higher the motor efficiency, the more obvious the power saving effect, the less permanent magnets are used, and the lower the motor manufacturing cost. The drive motor itself releases the amplitude to achieve the purpose of stable operation. The elastic pressure device can adjust the distance between the centripetal outer arc surface of the guide wheel fixing seat and the centripetal inner surface of the stator housing in the follow-up drive motor structure. The present invention subverts the traditional concept and allows the motor to operate normally even when it rotates eccentrically. The traditional concept is that eccentricity requires correction or maintenance. The present invention avoids frequent correction of the gap between the stator core and the rotor core, and avoids frequent maintenance and replacement of bearings. The bearing can still be used even if it is worn out, and it will not affect the efficiency of the motor. Unlike traditional structure motors, it does not need to be shut down for maintenance after eccentricity occurs. The continuous working time is longer. The grinder is large and difficult to maintain. Reducing the number of maintenance times means improving production efficiency.

[0036] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which fall within the scope of the present invention to be protected.

Claims

1. A follower drive motor for a permanent magnet direct drive ball mill, comprising a ball mill drum, a stator power mechanism, a rotor power mechanism, a support frame, and a rotating drum, characterized in that: The stator power mechanism is connected to the centripetal inner side of the support frame. The stator power mechanism includes stator silicon steel sheets, coils, stator housings, guide wheels, and elastic pressure devices. The rotor power mechanism includes rotor silicon steel sheets, permanent magnets, and magnetic isolation aluminum plates. The rotor power mechanism is arranged on the outer surface of the drum, the ball mill drum is arranged on the inner surface of the drum, the guide wheel is arranged between the centripetal inner surface of the stator housing and the drum, and the elastic pressure device is arranged between the support frame and the centripetal outer surface of the stator housing. The stator power mechanism and the rotor power mechanism constitute a follow-up drive motor. The permanent magnets and rotor silicon steel sheets are evenly distributed around the rotating shaft of the drum. The elastic pressure device includes a connecting rod, a fixed screw rod, an adjusting nut, and a pressure spring. Several bosses are welded on the inner side of the support frame, and several small support members are screwed on the bosses. The small support members support the connecting rod and the elastic pressure device. A concave cavity is provided on the stator housing, and the lower end of the connecting rod passes through the small support member and is inserted into the concave cavity. The fixed connecting disk at the upper end of the connecting rod is provided with a through hole, and multiple fixed screw rods pass through the through holes of the connecting disk and are screwed to the small support frame. An adjusting nut is installed above the fixed screw rod, and a pressure spring is provided between the adjusting nut and the fixed connecting disk of the connecting rod. The adjusting nut serves to adjust the radial pressure of the driving motor.

2. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: The support frame is assembled in a splicing manner and is installed on a pre-buried foundation in contact with the ground by screw connection.

3. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: The assembly position of the elastic pressure device is preferably assembled on the circumferential surface of the support frame, the pressure spring is a disc spring, and the concave cavity is welded to the lower end of the connecting rod.

4. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: The elastic pressure device is installed between the stator housing and the support frame without affecting the disassembly of the stator power mechanism, or is installed in the middle above the stator housing, or is installed on both sides above the stator housing.

5. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: A guide wheel fixing seat is fixed to the centripetal inner surface of the stator shell, and the guide wheel is installed on the guide wheel fixing seat. The guide wheel contacts the outer surface of the rotating drum. A single stator power mechanism is provided with four guide wheels, and the guide wheels are arranged at four centripetal corner positions of the follow-up drive motor chassis.

6. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: The follow-up drive motor adopts a modular design, and the stator power mechanism of the follow-up drive motor is independently installed on the circumference of the rotating drum. It has its own independent sector block shell mechanical structure, silicon steel sheet, water cooling pipe, coil and testing system, its own variable frequency power supply system and independent elastic pressure device.

7. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: The support frame is provided with stoppers fixedly at both ends of each follower drive motor along the circumferential direction, and the contact surfaces between the stoppers and the stator power mechanism are provided with rubber blocks.

8. The follower drive motor for a permanent magnet direct drive ball mill according to claim 3, characterized in that: The stator punchings of each stator module are stacked and tightened separately, compressed and fixed by an arc-shaped stator pressure ring, and small-span coils are embedded in the stator slots. At the same time, the stator winding is insulated and tied. The manufactured stator module is varnished and dried as a whole to complete the production and packaging of each module. Each stator module is installed and fixed on the fan-shaped stator housing, and is equipped with a guide wheel and an elastic pressure device. It is distributed and installed in the support frame to form a follow-up drive motor with the rotor power mechanism, and is debugged and operated separately or as a whole.

9. The follower drive motor for a permanent magnet direct drive ball mill according to claim 1, characterized in that: The elastic pressure device structure is arranged on the centripetal outer side of each stator shell and inside the support frame, and is distributed at different positions on the inner circumference of the support frame.

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