Modular permanent magnet direct drive motor for use in a ball mill

Abstract

The application discloses a modular permanent magnet direct drive motor used on a ball mill, which comprises a tension mechanism, a support frame, a stator power mechanism, a rotor power mechanism, a rotating drum and a ball mill drum, the stator power mechanism is arranged on the centripetal inner side of the support frame, the stator power mechanism comprises a stator shell, a stator iron core and a coil, the stator iron core is arranged in the stator shell, the tension mechanism is arranged between the stator shell and the support frame, and rollers are fixed on the two sides of the stator shell, the rotor power mechanism comprises a rotor iron core, permanent magnets and a magnetic separation 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 rotating drum is provided with a slide way for the rolling of the rollers, and the rollers are attached to the surface of the slide way of the rotating drum, which is away from the center of the circle; the novel structure design of the application can ensure the constant gap between the stator iron core and the rotor iron core, the gap can be designed to be very small, the amount of the permanent magnets can be reduced, the influence of the motor eccentricity can be greatly reduced, the protection mechanism is arranged to avoid the occurrence of the sweeping phenomenon and the damage of the motor, the manufacturing cost is low, the installation and dismounting are convenient, and the problems in the background art can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of drive motors for ball mills, and in particular to a modular permanent magnet direct drive motor used in ball mills. Background Art

[0002] A ball mill is a material pulverizing device. Its basic principle is to use rotational force to lift steel balls within a drum to a certain height, dropping them onto the material. The contact between the balls and the material pulverizes the material. Existing ball mills require a complex transmission mechanism. Traditionally, the motor output shaft drives a small gear through a reducer, which in turn drives a large gear, which in turn rotates the drum. Due to the large diameter of the ball mill drum, which serves as the rotor for a permanent magnet direct-drive motor, deformation can occur during mechanical manufacturing, material processing, and assembly. The excessive length and weight of the ball mill, coupled with play and wear in the support system, can cause eccentric oscillation during operation. This eccentric oscillation can cause uneven clearance between the stator and rotor cores, reducing motor efficiency, increasing motor temperature, and generating vibration and noise. In severe cases, it can also cause collisions between the stator and rotor cores, resulting in chamber scavenging and damage to the motor. Therefore, when manufacturing products, the only way to prevent motor bore scraping is to increase the gap between the stator core and the rotor core. Frequent shutdowns are also required to calibrate and adjust the gap. As the gap between the stator core and the rotor core of a direct-drive permanent magnet motor increases, the amount of permanent magnets used increases, and the cost of the motor also increases. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a modular permanent magnet direct drive motor for use in a ball mill. The structural design is novel, which can ensure that the gap between the stator core and the rotor core is constant, so that the gap design can be very small, reducing the amount of permanent magnets used, and at the same time greatly reducing or avoiding the impact of motor eccentricity, and providing a protective mechanism to avoid the occurrence of chamber sweeping and thus damage to the motor. The manufacturing cost is low, and the installation and disassembly are convenient, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above object, the application provides the following technical scheme: a modular permanent magnet direct drive motor used in a ball mill, comprising a tension mechanism, a support frame, a stator power mechanism, a rotor power mechanism, a rotating drum and a ball mill drum, characterized in that: the stator power mechanism is arranged on the centripetal inner side of the support frame, the stator power mechanism comprises a stator shell, a stator core, a coil and a roller, the stator core is arranged in the stator shell, the tension mechanism is arranged between the stator shell and the support frame, the roller is fixed on both sides of the stator shell, the rotor power mechanism comprises a rotor core, a permanent magnet and a magnetic separation 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 rotating drum is provided with a slide for the roller to roll, the roller is attached to the surface of the slide away from the center of the rotating drum, and the support frame is provided with a baffle.

[0005] Further, the tension mechanism comprises a force receiving plate and a tension spring, the force receiving plate is arranged on the side of the baffle, the upper end of the tension spring is fixedly connected with the force receiving plate, and the lower end of the tension spring is fixedly connected with the stator shell.

[0006] Further, the tension mechanism is arranged on the centripetal outer side of each stator shell and inside the support frame, and can be distributed at different positions on the inner circumference of the support frame; the tension of the tension mechanism can be changed by replacing different tension springs, or a structure capable of adjusting the tension can be adopted.

[0007] Further, the tension of the tension mechanism at different angles is different, for example, the tension of the tension mechanism directly above the motor is greater than the sum of the weight of the stator power mechanism and the attraction of the permanent magnet to the stator power mechanism, and the tension of the tension mechanism directly below the motor only needs to be greater than the difference between the attraction of the permanent magnet to the stator power mechanism and the weight of the stator power mechanism.

[0008] Further, a connecting plate is connected to the side of the stator shell through a fixing piece, the connecting plate is fixedly connected with a connecting rod, the connecting rod is connected with the roller, the fixing piece is a metal plate, and a bolt fixing hole is arranged on the metal plate.

[0009] Further, the rotating drum is connected with the ball mill drum through a flange plate.

[0010] Further, the distance between the baffle and the stator shell is set as a limit protection gap I, the distance of the limit protection gap I is less than the distance between adjacent stator cores, and the baffle and the stator shell are ensured to collide first through the limit protection gap I, at the same time, the adjacent stator cores will not collide, so as to avoid damaging the stator core and the coil.

[0011] Furthermore, the distance between the roller and the surface of the slideway in the rotating drum close to the center of the circle is set to a limit protection gap II. The distance of the protection gap II is smaller than the distance between the stator core and the rotor core. The protection gap II ensures that the stator core and the rotor core will not contact when the tension of the tension spring is attenuated, thereby avoiding the occurrence of a chamber sweep phenomenon and damaging the motor.

[0012] Furthermore, the pulling mechanism provides a pulling force away from the center of the circle to the stator power mechanism, so that the roller fits the surface of the slideway in the rotating drum away from the center of the circle. The roller rotates as the ball mill drum rotates. Regardless of whether the drum is centered or eccentric, the roller fits the slideway and rotates. As long as the pulling force does not decrease and the roller does not separate from the slideway, the gap will be maintained constant and the motor will not sweep the barrel.

[0013] Furthermore, when the tension of the tension spring decays, the roller will slide against the surface of the slideway in the rotating drum close to the center. Since the distance of the protective gap II is smaller than the distance between the stator core and the rotor core, the motor will not experience the bore sweeping phenomenon.

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

[0015] 1. The structural design of the present invention is novel, which can ensure that the gap between the stator core and the rotor core is constant, so that the gap can be designed to be very small, reducing the amount of permanent magnets used, and at the same time greatly reducing the impact of motor eccentricity. A protection mechanism is provided to avoid the occurrence of the bore sweeping phenomenon and thus damage to the motor. The manufacturing cost is low and the installation and disassembly are convenient.

[0016] 2. The present invention is provided with a tension mechanism to prevent the roller from separating from the surface of the slideway in the rotating drum away from the center. The roller rotates as the ball mill drum rotates. Regardless of whether the drum is centered or eccentric, the roller will rotate in line with the slideway. As long as the tension is not reduced and the roller does not separate from the slideway, the gap between the stator core and the rotor core will be kept constant.

[0017] 3. The present invention is provided with a limiting protection gap I, which ensures that the baffle collides with the stator housing first, while the adjacent stator cores do not collide, thereby avoiding damage to the stator core and the coil. The protection gap II ensures that the stator core and the rotor core do not contact when the tension of the tension spring decays, thereby avoiding the occurrence of a chamber sweep phenomenon and damage to the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a single tension mechanism of the present invention;

[0019] Figure 2 It is a schematic side view of the structure of the present invention;

[0020] Figure 3 It is a front view schematic diagram of the overall structure of the present invention.

[0021] In the figure: 1 connecting rod, 2 limit protection gap II, 3 rotating drum, 4 connecting plate, 5 fixing part, 6 tension spring, 7 force plate, 8 stator housing, 9 supporting frame, 10 baffle, 11 limit protection gap I, 12 permanent magnet, 13 magnetic isolation aluminum plate, 14 roller, 15 rotor core, 16 rotor mechanism, 17 ball mill drum, 18 stator core. DETAILED DESCRIPTION

[0022] 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.

[0023] The present invention is described in detail with reference to the accompanying drawings and provides a technical solution: it includes a tension mechanism, a support frame, a stator power mechanism, a rotor power mechanism, a rotating drum, and a ball mill drum, and is characterized in that: the stator power mechanism is arranged on the centripetal inner side of the support frame, the stator power mechanism includes a stator shell, a stator core, a coil, and a roller, the stator core is arranged in the stator shell, a tension mechanism is arranged between the stator shell and the support frame, the roller is fixed on both sides of the stator shell, the rotor power mechanism includes a rotor core, 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 rotating drum is provided with a slideway for the roller to roll, the roller is attached to the surface of the slideway in the rotating drum away from the center of the circle, and a baffle is provided on the support frame; the distance between the baffle and the stator shell is set to a limit protection gap I, the distance of the limit protection gap I is smaller than the distance between adjacent stator cores, and the limit protection gap I ensures that the baffle collides with the stator shell first, and at the same time, adjacent stator cores will not collide, thereby avoiding damage to the stator core and the coil. The distance between the roller and the surface of the slideway in the rotating drum close to the center of the circle is set as the limit protection gap II. The distance of the protection gap II is smaller than the distance between the stator core and the rotor core. The protection gap II ensures that the stator core and the rotor core will not contact each other, avoiding the occurrence of the chamber sweeping phenomenon and damaging the motor. The rotating drum is connected to the ball mill drum through the flange. The tension mechanism provides a pulling force away from the center of the circle to the stator power mechanism, so that the roller fits the surface of the slideway in the rotating drum away from the center of the circle. The roller rotates as the ball mill drum rotates, regardless of whether the drum is centered or eccentric. They all rotate along the slide. As long as the tension does not decrease and the roller does not separate from the slide, the gap will be kept constant and the motor will not sweep the bore. The tension mechanism includes a force plate and a tension spring. The force plate is arranged on the side of the baffle. The upper end of the tension spring is fixedly connected to the force plate, and the lower end of the tension spring is fixedly connected to the stator shell. The tension mechanism is arranged on the centripetal outer side of each stator shell and inside the support frame, and can be distributed at different parts of the inner circumference of the support frame. The tension of the tension mechanism can be changed by replacing different tension springs, or a structure that can adjust the tension can be used. A connecting plate is connected to the side of the stator shell through a fixing piece, the connecting plate is fixed to the connecting rod, and the connecting rod is connected to the roller, and the fixing piece is a metal plate with bolt fixing holes provided on the metal plate; the permanent magnet acts on the stator power mechanism to attract the stator power mechanism toward the center of the circle, the support frame is fixed, and the tension spring of the tension mechanism installed on the support frame acts on the stator power mechanism to pull away from the center of the circle; when the tension of the tension spring is greater than the sum of the attraction of the permanent magnet and the weight of the stator power mechanism itself, the roller will always fit the surface of the slideway in the rotating drum away from the center of the circle, and the roller rotates as the ball mill drum rotates. Regardless of whether the drum is centered or eccentric, the roller fits the slideway and rotates. As long as the tension does not decrease and the roller does not separate from the slideway, the gap between the stator and the rotor will remain constant; when the tension of the tension spring decays and is not enough to pull up the stator power mechanism, the permanent magnet will attract the stator power mechanism toward the center of the circle, and at this time the roller will fit the surface of the slideway in the rotating drum close to the center of the circle.The structure has two limit protections. One is located at the baffle and the stator housing. The distance between the baffle and the stator housing should be smaller than the distance between adjacent stator cores to ensure that the baffle collides with the stator housing first, and the adjacent stator cores will not collide, thereby avoiding damage to the stator core and the coil; the other is located at the surface close to the center of the circle between the roller and the rotor mechanism to ensure that when the roller fits the surface of the rotor mechanism away from the center of the circle, the distance between the roller and the surface of the slideway in the rotating drum close to the center of the circle is smaller than the gap between the stator and the rotor. The purpose is that when the tension of the tension spring decays, the roller will fit the surface of the rotor mechanism away from the center of the circle, the gap between the stator and the rotor will become smaller, but the stator core and the rotor core will not contact, thereby avoiding the phenomenon of sweeping the chamber and damaging the motor.

[0024] 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 modular permanent magnet direct drive motor for a ball mill, comprising a tension mechanism, a support frame, a stator power mechanism, a rotor power mechanism, a rotating drum, and a ball mill drum, characterized in that: The stator power mechanism is arranged on the centripetal inner side of the support frame, and the stator power mechanism includes a stator shell, a stator core, a coil, and a roller. The stator core is arranged in the stator shell, and a tension mechanism is arranged between the stator shell and the support frame. The roller is fixed on both sides of the stator shell. The rotor power mechanism includes a rotor core, a permanent magnet, and a magnetic isolation aluminum plate. The rotor power mechanism is arranged on the outer surface of the rotating drum, and the ball mill drum is arranged on the inner surface of the rotating drum. The rotating drum is provided with a slideway for the roller to roll, and the roller is attached to the surface of the slideway in the rotating drum away from the center of the circle. The support frame is provided with a roller. A baffle is provided, and the pulling mechanism includes a force-bearing plate and a tension spring. The force-bearing plate is arranged on the side of the baffle, the upper end of the tension spring is fixedly connected to the force-bearing plate, and the lower end of the tension spring is fixedly connected to the stator housing. The distance between the roller and the surface of the slideway in the rotating drum close to the center of the circle is set to a limit protection gap II, and the distance of the protection gap II is smaller than the distance between the stator core and the rotor core. When the tension of the tension spring decays, the roller will slide against the surface of the slideway in the rotating drum close to the center of the circle. Since the distance of the protection gap II is smaller than the distance between the stator core and the rotor core, the motor will not experience a chamber sweeping phenomenon.

2. The modular permanent magnet direct drive motor for a ball mill according to claim 1, characterized in that: A connecting plate is connected to the side surface of the stator housing via a fixing piece. The connecting plate is fixed to the connecting rod, and the connecting rod is connected to the roller. The fixing piece is a metal plate, and a bolt fixing hole is provided on the metal plate.

3. The modular permanent magnet direct drive motor for a ball mill according to claim 1, characterized in that: The rotating drum is connected to the ball mill drum through a flange.

4. The modular permanent magnet direct drive motor for a ball mill according to claim 1, characterized in that: The distance between the baffle and the stator housing is set to a position limiting protection gap I, and the distance of the position limiting protection gap I is smaller than the distance between adjacent stator cores.

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