Permanent magnet direct drive motor for ball mill

Abstract

The invention relates to the field of permanent magnet direct drive motors, in particular to a permanent magnet direct drive motor for a ball mill, which comprises a machine body part, a rotor part is arranged in the machine body part, two groups of external fixing parts are arranged at the bottom of the machine body part, and locking parts are arranged in the two groups of external fixing parts. Through shaft sleeve type connection of the synchronous sleeve and the rotor rotating shaft and cooperation of the butt joint block and the arc-shaped groove of the same-position baffle plate, high-precision positioning during installation is guaranteed, assembling and debugging time is reduced, and the whole rotor part can be rapidly disassembled. The motor is used as an energy-saving motor, and the rotor part can be taken out by pulling out the rotor rotating shaft during maintenance. By utilizing the driving effect when the synchronous sleeve is separated from the rotor rotating shaft, the magnetic fixing frame is separated from the inner insertion through hole of the rotor iron core, the permanent magnet is directly exposed, complicated disassembly steps are not needed, the permanent magnet replacement process is simplified, the replacement time is greatly shortened, the maintenance difficulty is remarkably reduced, and the problem of difficult maintenance caused by the complicated disassembly steps of the permanent magnet is avoided.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet direct drive motors, specifically a permanent magnet direct drive motor for ball mills. Background Technology

[0002] In modern industrial production, ball mills, as key equipment widely used in mining, metallurgy, chemical, and building materials industries, undertake the important task of material grinding and crushing. With the continuous development of permanent magnet motor technology, permanent magnet direct drive motors have gradually become a research hotspot for ball mill drive systems due to their unique advantages. Permanent magnet direct drive motors directly connect the motor to the ball mill cylinder, eliminating the intermediate multi-stage reduction transmission device and fundamentally simplifying the system structure. At the same time, the direct drive method avoids energy loss during transmission, further improving the energy efficiency of the entire drive system. However, ball mills have characteristics such as high load, high starting torque requirements, and complex and variable operating conditions, which place higher demands on permanent magnet direct drive motors. As a typical high-inertia, heavy-load starting device, the ball mill requires the permanent magnet direct drive motor to operate under high load for a long time, which leads to a sharp increase in copper and iron losses inside the motor, causing a rapid rise in the temperature of the windings and permanent magnets, resulting in demagnetization of the motor and a decrease in magnetic flux. Therefore, a permanent magnet direct drive motor is needed to facilitate its use in ball mills.

[0003] In ball mill applications, traditional permanent magnet direct drive motors often employ embedded or built-in permanent magnet layouts in their magnetic circuit structures. These permanent magnets are dispersed and embedded within the rotor core. When dealing with permanent magnet demagnetization faults, maintenance is extremely complex for this energy-saving motor. It requires sequentially disassembling core components such as the motor end cover, bearings, and rotor core to access the failed magnet. Furthermore, the use of high-strength adhesives or interference fits between the permanent magnet and the core further complicates disassembly and replacement, making it difficult to replace the permanent magnet. Additionally, the mechanical vibrations generated during ball mill operation can be transmitted to the permanent magnet direct drive motor through the base. Prolonged vibration can cause fatigue and loosening of the motor base's connecting bolts, leading to eccentric operation. This eccentricity exacerbates bearing wear and shortens the motor's lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a permanent magnet direct-drive motor for ball mills, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a permanent magnet direct drive motor for a ball mill, comprising a body portion, an internal rotor portion, a rotor portion including a rotor shaft, a mating block fixedly connected to the outer wall of the rotor shaft, a co-position baffle fixedly fitted to the outside of the mating block, three circumferentially distributed fixed magnet frames fixedly connected to the co-position baffle, two sets of external fixed portions at the bottom of the body portion, each set of external fixed portions including a fixed foot, an internal adjustment groove formed inside the fixed foot, a locking portion inside each set of external fixed portions, and an internal fixed gear movably connected to the corresponding internal adjustment groove, the internal fixed gear being connected to a movable ruler plate via a snap-fit, and top feet fixedly connected to both ends of the movable ruler plate.

[0006] Preferably, the body part includes a permanent magnet shell, a junction box is fixedly connected to the top of the permanent magnet shell, a permanent magnet stator is fixedly connected inside the permanent magnet shell, an engine shaft shell is fixedly connected to the bottom surface of the permanent magnet shell, the engine shaft shell and the permanent magnet shell are kept on the same axis, an engine shaft hole is opened at the center of the engine shaft shell, and four external base frames are fixedly connected to the bottom of the permanent magnet shell.

[0007] Preferably, the rotor shaft is rotatably connected to the shaft hole of the machine shaft housing, and a hexagonal prism-shaped protrusion is fixedly connected to the end of the rotor shaft. The rotor shaft and the permanent magnet stator are kept on the same axis. Three arc-shaped grooves distributed in a circle are opened on the outer wall of the docking block. A synchronization sleeve is fixedly fitted on the outer wall of the rotor shaft, and a rotor core is fixedly fitted on the outside of the synchronization sleeve.

[0008] Preferably, the rotor core has three circumferentially distributed internal insertion holes, the inner wall of the corresponding baffle has three arc-shaped protrusions that fit into the fan-shaped grooves of the docking block, each of the three magnet holders has a set of slots, the three magnet holders are respectively fixedly inserted into the corresponding internal insertion holes, the slots in the three magnet holders are each fixedly inserted with a permanent magnet, and the three sets of permanent magnets are respectively fixedly inserted into the corresponding internal insertion holes.

[0009] Preferably, the exterior of the body portion is provided with a heat dissipation section, which includes a heat dissipation sleeve. The heat dissipation sleeve is fixed to the other bottom surface of the permanent magnet shell. The heat dissipation sleeve is provided with a heat dissipation panel. An inner frame is fixed to the inner wall of the heat dissipation sleeve. A shaft hole is opened at the center of the inner frame. A set of fan-shaped through holes distributed in a circle are opened on the inner frame. Six docking holes are opened in a circle. A torsion block is rotatably connected in the shaft hole of the inner frame. A docking slot is opened on one bottom surface of the torsion block. A hexagonal prism protrusion of the rotor shaft is fixedly inserted in the docking slot.

[0010] Preferably, a cooling fan is fixedly connected to the bottom surface of the other side of the torsion block. The cooling fan is rotatably connected to the inside of the cooling sleeve. A barrier cover is fixedly inserted inside the cooling sleeve. A dustproof plate is provided on the barrier cover. A shaft hole is provided in the middle of the dustproof plate of the barrier cover. A rotor shaft is rotatably connected in the shaft hole of the barrier cover. Six circumferentially distributed docking blocks are fixedly connected to the barrier cover. The six docking blocks are respectively fixedly inserted into corresponding docking holes.

[0011] Preferably, the fixed base is fixedly connected to the two external base frames on the same side, the fixed base has a rectangular through hole, the upper and lower sides of the inner adjustment groove are connected to rectangular through holes, the inner adjustment groove is connected to the rectangular through holes of the fixed base, the inner wall of the inner adjustment groove is fixedly connected to a fixed ruler plate, and the outer wall of the fixed base has two opposing inward grooves, both of which are connected to circular through holes.

[0012] Preferably, the internal fixed gear is connected to the fixed ruler plate by a snap ring, the internal fixed gear has a shaft hole at its center, and cylindrical rods are fixed to both the upper and lower sides of the internal fixed gear. The cylindrical rods of the internal fixed gear are slidably connected to the rectangular through holes of the corresponding internal adjustment grooves.

[0013] Preferably, a fixed shaft is rotatably connected inside the shaft hole of the internal fixed gear. A threaded through hole is provided at the center of the fixed shaft. A locking bolt is threaded onto the fixed shaft through the threaded through hole. The movable ruler plate is slidably connected inside the rectangular through hole of the fixed base. Both top feet are fixedly connected with a retaining block. Both retaining blocks are slidably connected in corresponding inner grooves. Both retaining blocks are fixedly connected with a buffer spring.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The high-precision positioning of each component during installation is ensured by the bushing connection between the synchronous sleeve and the rotor shaft, the arc-shaped groove of the mating block and the corresponding baffle, and the precise fit between the hexagonal prism protrusion at the end of the rotor shaft and the mating slot of the torsion block. This reduces assembly and debugging time, improves production efficiency, and ensures the stability and reliability of motor operation. The rotor can be quickly disassembled as a whole. During maintenance, the rotor shaft can be pulled out to remove the rotor. The magnetic frame is disengaged from the inner through hole of the rotor core by the driving action of the synchronous sleeve separating from the rotor shaft, directly exposing the permanent magnet. This simplifies the permanent magnet replacement process without complicated disassembly steps, significantly shortens the replacement time, significantly reduces maintenance difficulty, and saves manpower and time costs.

[0016] 2. When the vibration of the ball mill is transmitted to the motor and the fixed base vibrates, the internal fixed gear rotates under the action of the fixed ruler plate, driving the movable ruler plate to move in the opposite direction, so that the top foot plate is pressed tightly against the fixed base. Combined with the clamping block and the buffer spring, the vibration energy is absorbed and converted, preventing the motor from shifting, maintaining a stable connection between the motor and the ball mill, reducing vibration damage to the motor, reducing the risk of loosening and wear of parts, and ensuring normal motor transmission. At the same time, the connection between the fixed base and the external base frame, as well as the locking structure composed of the internal fixed gear, movable ruler plate and other components, provide stable support for the motor. The locking teeth connection between the internal fixed gear and the fixed ruler plate, together with the buffer spring, can adaptively adjust the clamping force according to the vibration conditions, so that the motor can maintain stable operation under different working conditions and enhance the motor's adaptability to complex working environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional assembly structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the three-dimensional assembly structure from below according to the present invention;

[0019] Figure 3 This is an exploded structural diagram of the present invention;

[0020] Figure 4 This is an exploded bottom view schematic diagram of the structure of the present invention;

[0021] Figure 5 This is a partial cross-sectional view of the present invention;

[0022] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of part A is shown.

[0023] Figure 7 For the present invention Figure 5 A schematic diagram of the enlarged structure of section B is shown.

[0024] Figure 8 This is a schematic diagram of the assembly structure of the body part of the present invention;

[0025] Figure 9 This is a schematic diagram of the rotor assembly structure of the present invention;

[0026] Figure 10 This is a schematic diagram of the assembly structure of the heat dissipation part of the present invention;

[0027] Figure 11 This is a schematic diagram of the assembly structure of the outer fixing part and the locking part of the present invention.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Main Body; 101. Permanent Magnet Housing; 102. Junction Box; 103. Permanent Magnet Stator; 104. Shaft Housing; 105. External Base Frame; 2. Rotor Body; 201. Rotor Shaft; 202. Connecting Block; 203. Synchronous Sleeve; 204. Rotor Core; 205. Internal Through Hole; 206. Co-position Baffle; 207. Magnet Fixing Frame; 208. Permanent Magnet; 3. Heat Dissipation Part; 301. Heat Dissipation Sleeve; 302. Internal Fixing Frame; 303. 304. Connecting socket; 305. Torsion block; 306. Connecting slot; 307. Cooling fan; 308. Barrier cover; 309. Connecting plug; 4. External fixing part; 401. Fixed foot; 402. Internal adjustment groove; 403. Fixed ruler plate; 404. Internal shrink groove; 5. Locking part; 501. Internal fixing gear; 502. Fixed shaft; 503. Locking bolt; 504. Movable ruler plate; 505. Top foot plate; 506. Binding block; 507. Buffer spring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figure 1 - Figure 11 A permanent magnet direct drive motor for a ball mill includes a body part 1. Inside the body part 1 is a rotor part 2. The rotor part 2 includes a rotor shaft 201. A docking block 202 is fixedly connected to the outer wall of the rotor shaft 201. A corresponding baffle 206 is fixedly sleeved on the outside of the docking block 202. Three circumferentially distributed fixed magnet frames 207 are fixedly connected to the corresponding baffle 206. The bottom of the body part 1 is provided with two sets of external fixed parts 4. Both sets of external fixed parts 4 include fixed feet 401. An internal adjustment groove 402 is opened inside the fixed feet 401. Both sets of external fixed parts 4 are provided with locking parts 5. Both sets of locking parts 5 include internal fixed gears 501. The internal fixed gears 501 are movably connected in the corresponding internal adjustment grooves 402. The internal fixed gears 501 are connected to a movable ruler plate 504 through a snap tooth. Top foot plates 505 are fixedly connected to both ends of the movable ruler plate 504.

[0032] The main body 1 includes a permanent magnet housing 101, a junction box 102 fixed to the top of the permanent magnet housing 101, a permanent magnet stator 103 fixed to the inside of the permanent magnet housing 101, a shaft housing 104 fixed to the bottom surface of the permanent magnet housing 101, the shaft housing 104 and the permanent magnet housing 101 are kept on the same axis, a shaft hole is opened at the center of the shaft housing 104, and four external base frames 105 are fixed to the bottom of the permanent magnet housing 101.

[0033] The rotor shaft 201 is rotatably connected to the shaft hole of the shaft housing 104. A hexagonal prism-shaped protrusion is fixed at the end of the rotor shaft 201. The rotor shaft 201 and the permanent magnet stator 103 are kept on the same axis. Three arc-shaped grooves are provided on the outer wall of the mating block 202. A synchronous sleeve 203 is fixedly sleeved on the outer wall of the rotor shaft 201. The rotor core 204 is fixedly sleeved on the outside of the synchronous sleeve 203.

[0034] The rotor core 204 has three circumferentially distributed internal insertion holes 205. The inner wall of the corresponding baffle 206 has three arc-shaped protrusions that fit into the fan-shaped grooves of the docking block 202. Each of the three magnet holders 207 has a set of slots. The three magnet holders 207 are respectively fixed in the corresponding internal insertion holes 205. Permanent magnets 208 are fixed in the slots of the three magnet holders 207. The three sets of permanent magnets 208 are respectively fixed in the corresponding internal insertion holes 205.

[0035] In this embodiment, as an energy-saving motor, a docking block 202 is fixedly installed on the outer wall of the rotor shaft 201. A synchronizing sleeve 203 is fitted onto the rotor shaft 201, and then the rotor core 204 is fitted onto the outside of the synchronizing sleeve 203. The synchronizing baffle 206 is fixedly fitted onto the outside of the docking block 202 by utilizing the arc-shaped protrusion on the inner wall of the corresponding baffle 206 and the arc-shaped groove on the outer wall of the docking block 202. Then, three magnetic fixing frames 207 are inserted into the corresponding internal insertion holes 205 on the rotor core 204, and permanent magnets 208 are embedded into the slots of the magnetic fixing frames 207, completing the assembly of the rotor part 2. During maintenance, the rotor shaft 201 is removed from the shaft housing 104. The rotor part 2 is removed as a whole by pulling it out of the shaft hole. Since the synchronous sleeve 203 and the rotor shaft 201 are connected by a bushing, the synchronous sleeve 203 and the rotor shaft 201 can be separated by external tools after the rotor part 2 is removed. At the same time, during the separation process, the synchronous sleeve 203 pulls the solid magnet 207 out of the inner insertion hole 205, exposing the solid magnet 207. After it is completely pulled out, the failed permanent magnet 208 can be easily taken out from the slot to complete the replacement process in one go. By removing it in one go, the replacement process of the permanent magnet 208 is simplified, the disassembly and replacement difficulty is reduced, and the replacement of the permanent magnet 208 is convenient.

[0036] Example 2: Please refer to Figure 1 - Figure 11The exterior of the body part 1 is provided with a heat dissipation part 3, which includes a heat dissipation sleeve 301. The heat dissipation sleeve 301 is fixed to the other bottom surface of the permanent magnet shell 101. The heat dissipation sleeve 301 is provided with a heat dissipation panel. An inner frame 302 is fixed to the inner wall of the heat dissipation sleeve 301. A shaft hole is opened at the center of the inner frame 302. A set of fan-shaped through holes distributed in a circle are opened on the inner frame 302. Six docking holes 303 are distributed in a circle on the inner frame 302. A torsion block 304 is rotatably connected in the shaft hole of the inner frame 302. A docking slot 305 is opened on one bottom surface of the torsion block 304. A hexagonal prism protrusion of the rotor shaft 201 is fixedly inserted in the docking slot 305.

[0037] A cooling fan 306 is fixedly connected to the bottom surface of the other side of the torsion block 304. The cooling fan 306 is rotatably connected to the inside of the cooling sleeve 301. A barrier cover 307 is fixedly inserted inside the cooling sleeve 301. A dustproof plate is provided on the barrier cover 307. A shaft hole is provided in the middle of the dustproof plate of the barrier cover 307. A rotor shaft 201 is rotatably connected in the shaft hole of the barrier cover 307. Six circumferentially distributed docking blocks 308 are fixedly connected to the barrier cover 307. The six docking blocks 308 are respectively fixedly inserted into the corresponding docking holes 303.

[0038] In this embodiment, as an energy-saving electric motor, during motor operation, the rotor shaft 201 rotates, driving the torsion block 304 and the cooling fan 306 to rotate synchronously. The rotation of the cooling fan 306 generates airflow, and external cold air enters the interior of the cooling sleeve 301 through the heat dissipation panel on the cooling sleeve 301 and the fan-shaped through hole of the inner frame 302, sweeps over the surface of the permanent magnet shell 101, and carries away the heat generated by the motor operation. The hot air is then discharged from the air outlet of the cooling sleeve 301, realizing active heat dissipation of the motor and controlling the working temperature of the permanent magnet 208 below the demagnetization threshold, avoiding magnetic flux attenuation due to high temperature, and ensuring the long-term efficient operation of the energy-saving electric motor. At the same time, the built-in barrier cover 307 facilitates heat dissipation of the motor while preventing dust generated by the ball mill during operation from entering the motor, so as to maintain the normal use of the motor.

[0039] Example 3: Please refer to Figure 1 - Figure 11 The fixed base 401 is fixedly connected to the two external base frames 105 on the same side. A rectangular through hole is opened in the fixed base 401. The upper and lower sides of the inner adjustment groove 402 are connected to rectangular through holes. The inner adjustment groove 402 is connected to the rectangular through hole of the fixed base 401. A fixed ruler plate 403 is fixedly connected to the inner wall of the inner adjustment groove 402. Two opposing inner grooves 404 are opened on the outer wall of the fixed base 401. Both inner grooves 404 are connected to circular through holes.

[0040] The internal fixed gear 501 is connected to the fixed ruler plate 403 by a snap ring. The internal fixed gear 501 has a shaft hole at its center. Cylindrical rods are fixed to both the upper and lower sides of the internal fixed gear 501. The cylindrical rods of the internal fixed gear 501 are slidably connected to the rectangular through holes of the corresponding internal adjustment grooves 402.

[0041] A fixed shaft 502 is rotatably connected inside the shaft hole of the internal fixed gear 501. A threaded through hole is opened at the center of the fixed shaft 502. A locking bolt 503 is threadedly connected to the fixed shaft 502 through the threaded through hole. The movable ruler plate 504 is slidably connected in the rectangular through hole of the fixed base 401. A retaining block 506 is fixedly connected to both top foot plates 505. Both retaining blocks 506 are slidably connected in the corresponding inner grooves 404. A buffer spring 507 is fixedly connected to both retaining blocks 506.

[0042] In this embodiment, as an energy-saving electric motor, when the vibration generated by the ball mill operation is transmitted to the motor, the fixed base 401 vibrates accordingly. The internal fixed gear 501 is fixed in position by the fixed shaft 502 and the locking bolt 503 in conjunction with the external expansion sleeve. Because the overall volume of the internal fixed gear 501 is much smaller than that of the motor, it is less affected by vibration. When the fixed base 401 is displaced due to vibration, the fixed ruler plate 403 drives the internal fixed gear 501 to rotate, forcing the movable ruler plate 504 to move in the opposite direction to the fixed ruler plate 403, so that the top foot plate 505 presses against the fixed base 401 to prevent it from shifting through locking. The positioning block 506 absorbs vibration energy under the action of the buffer spring 507, ensuring the stability of the connection between the motor and the ball mill, avoiding connection misalignment, and ensuring normal motor transmission.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet direct-drive motor for a ball mill, characterized in that, The device includes a body part (1), inside which is a rotor part (2). The rotor part (2) includes a rotor shaft (201). A docking block (202) is fixedly connected to the outer wall of the rotor shaft (201). A co-position baffle (206) is fixedly fitted to the outside of the docking block (202). Three circumferentially distributed magnetic frames (207) are fixedly connected to the co-position baffle (206). Two sets of external fixed parts (4) are provided at the bottom of the body part (1). Both sets of external fixed parts (4) are... The device includes a fixed base (401), which has an internal adjustment groove (402) inside. Both sets of external fixed parts (4) have locking parts (5) inside. Both sets of locking parts (5) include internal fixed gears (501). The internal fixed gears (501) are movably connected in the corresponding internal adjustment grooves (402). The internal fixed gears (501) are connected to a movable ruler plate (504) through a snap-fit. Both ends of the movable ruler plate (504) are fixedly connected to top foot plates (505).

2. The permanent magnet direct drive motor for a ball mill according to claim 1, characterized in that: The body part (1) includes a permanent magnet shell (101), a junction box (102) is fixedly connected to the top of the permanent magnet shell (101), a permanent magnet stator (103) is fixedly connected inside the permanent magnet shell (101), an organic shaft shell (104) is fixedly connected to the bottom surface of the permanent magnet shell (101), the organic shaft shell (104) and the permanent magnet shell (101) are kept on the same axis, an axle hole is opened at the center of the organic shaft shell (104), and four external base frames (105) are fixedly connected to the bottom of the permanent magnet shell (101).

3. A permanent magnet direct drive motor for a ball mill according to claim 2, characterized in that: The rotor shaft (201) is rotatably connected to the shaft hole of the machine shaft housing (104). A hexagonal prism protrusion is fixedly connected to the end of the rotor shaft (201). The rotor shaft (201) and the permanent magnet stator (103) are kept on the same axis. Three arc-shaped grooves are opened on the outer wall of the docking block (202). A synchronous sleeve (203) is fixedly sleeved on the outer wall of the rotor shaft (201). The rotor core (204) is fixedly sleeved on the outside of the synchronous sleeve (203).

4. A permanent magnet direct drive motor for a ball mill according to claim 3, characterized in that: The rotor core (204) has three circumferentially distributed internal insertion holes (205). The inner wall of the corresponding baffle (206) has three arc-shaped protrusions that fit into the fan-shaped groove of the docking block (202). Each of the three magnetic frames (207) has a set of slots. The three magnetic frames (207) are respectively fixed in the corresponding internal insertion holes (205). Permanent magnets (208) are fixed in the slots of the three magnetic frames (207). The three sets of permanent magnets (208) are respectively fixed in the corresponding internal insertion holes (205).

5. A permanent magnet direct drive motor for a ball mill according to claim 1, characterized in that: The exterior of the body part (1) is provided with a heat dissipation part (3), which includes a heat dissipation sleeve (301). The heat dissipation sleeve (301) is fixed to the other bottom surface of the permanent magnet shell (101). The heat dissipation sleeve (301) is provided with a heat dissipation panel. An inner frame (302) is fixed to the inner wall of the heat dissipation sleeve (301). A shaft hole is opened at the center of the inner frame (302). A set of fan-shaped through holes distributed in a circle is opened on the inner frame (302). Six docking holes (303) distributed in a circle are opened on the inner frame (302). A torsion block (304) is rotatably connected in the shaft hole of the inner frame (302). A docking slot (305) is opened on one bottom surface of the torsion block (304). A hexagonal prism protrusion of the rotor shaft (201) is fixedly inserted in the docking slot (305).

6. A permanent magnet direct drive motor for a ball mill according to claim 5, characterized in that: A cooling fan (306) is fixedly attached to the bottom surface of the other side of the torsion block (304). The cooling fan (306) is rotatably connected to the inside of the cooling sleeve (301). A barrier cover (307) is fixedly inserted inside the cooling sleeve (301). A dustproof plate is provided on the barrier cover (307). A shaft hole is provided in the middle of the dustproof plate of the barrier cover (307). A rotor shaft (201) is rotatably connected in the shaft hole of the barrier cover (307). Six circumferentially distributed docking blocks (308) are fixedly attached to the barrier cover (307). The six docking blocks (308) are respectively fixedly inserted into the corresponding docking holes (303).

7. A permanent magnet direct drive motor for a ball mill according to claim 2, characterized in that: The fixed base (401) is fixedly connected to the two external base frames (105) on the same side. A rectangular through hole is provided in the fixed base (401). The upper and lower sides of the inner adjustment groove (402) are connected to rectangular through holes. The inner adjustment groove (402) is connected to the rectangular through hole of the fixed base (401). A fixed ruler plate (403) is fixedly connected to the inner wall of the inner adjustment groove (402). Two opposing inner grooves (404) are provided on the outer wall of the fixed base (401). Both inner grooves (404) are connected to circular through holes.

8. A permanent magnet direct drive motor for a ball mill according to claim 7, characterized in that: The internal fixed gear (501) is connected to the fixed ruler plate (403) by a snap ring. The internal fixed gear (501) has a shaft hole at its center. Cylindrical rods are fixed to both the upper and lower sides of the internal fixed gear (501). The cylindrical rods of the internal fixed gear (501) are slidably connected to the rectangular through holes of the corresponding internal adjustment grooves (402).

9. A permanent magnet direct drive motor for a ball mill according to claim 8, characterized in that: A fixed shaft (502) is rotatably connected to the shaft hole of the internal fixed gear (501). A threaded through hole is provided at the center of the fixed shaft (502). A locking bolt (503) is threadedly connected to the fixed shaft (502) through the threaded through hole. The movable ruler plate (504) is slidably connected to the rectangular through hole of the fixed base (401). A retaining block (506) is fixedly connected to both top foot plates (505). Both retaining blocks (506) are slidably connected to the corresponding inner grooves (404). A buffer spring (507) is fixedly connected to both retaining blocks (506).

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