An autogenous ball mill and an autogenous ball milling system

Abstract

The present application relates to a self-grinding ball mill and a self-grinding ball mill system, belonging to the field of ball mill technology. It includes a ball mill body, and also includes a mounting frame, a mounting box, a cooling mechanism and a driving mechanism. The mounting frame covers the outside of the ball mill body. A guide rail parallel to the outer wall of the ball mill body is provided on the mounting frame. The mounting box is slidably arranged on the guide rail. The cooling mechanism is arranged on the mounting box and is in contact with the ball mill body. The cooling mechanism is used to cool down the ball mill body. The driving mechanism is arranged on the guide rail and is connected to the mounting box. The driving mechanism is used to drive the mounting box to move around the ball mill body on the guide rail. The present application can improve the problem that the friction heat of materials during the use of the ball mill affects the grinding effect.

Description

Technical Field

[0001] This application relates to the field of ball mill technology, and particularly to a self-grinding ball mill and a self-grinding ball mill system. Background Art

[0002] In the production process of powder building materials such as cement, gypsum powder, and lime powder, the grinding process is involved. After the raw materials of these materials are crushed, they are usually crushed and ground by a self-grinding ball mill.

[0003] A ball mill is a grinding mill. Inside the ball mill, there are multiple steel balls with different diameters. The materials and the steel balls rotate in the drum as the drum rotates. When the steel balls rise to a certain height and the gravity of the steel balls is greater than the centrifugal force they receive, the steel balls will fall off the inner wall of the drum. The huge impact force of the steel balls will break the materials. At the same time, with the rotation of the ball mill, the sliding between multiple steel balls will continuously grind the materials. The ball mill has the advantages of high operating efficiency, large output, low dust pollution, adjustable particle size, and low failure rate.

[0004] In view of the above related technologies, during the grinding process of the ball mill on the materials, the materials will generate heat through friction. The heated material powder will adhere to and coat the steel balls, affecting the grinding effect. Summary of the Invention

[0005] In order to improve the problem that the grinding effect is affected by the heat generated by the friction of the materials during the use of the ball mill, this application provides a self-grinding ball mill and a self-grinding ball mill system.

[0006] On the one hand, a self-grinding ball mill provided by this application adopts the following technical solutions:

[0007] A self-grinding ball mill and a self-grinding ball mill system include a ball mill body, and also include a mounting frame, a mounting box, a cooling mechanism, and a driving mechanism. The mounting frame covers the outside of the ball mill body. A guide rail parallel to the outer wall of the ball mill body is provided on the mounting frame. The mounting box is slidably arranged on the guide rail. The cooling mechanism is arranged on the mounting box and is in contact with the ball mill body. The cooling mechanism is used to cool down the ball mill body. The driving mechanism is arranged on the guide rail and is connected to the mounting box. The driving mechanism is used to drive the mounting box to move around the ball mill body on the guide rail.

[0008] Optionally, the cross-section of the guide rail is T-shaped, and a clamping groove adapted to the guide rail is opened at the top of the mounting box.

[0009] Optionally, steel balls are embedded on both sides of the mounting box and located on both sides of the guide rail.

[0010] Optionally, the driving mechanism includes a rack, a gear, and a driving motor. The rack is arranged inside the guide rail. The driving motor is arranged on the mounting box. The gear is coaxially arranged on the output shaft of the driving motor, and the gear meshes with the rack.

[0011] Optionally, the driving mechanism includes a driving ring, a mounting block, an electromagnet, a thermal expansion element, and a connecting piece. The driving ring is connected to the mounting frame. The driving ring is an annular hollow plate body covering the outside of the ball mill body and parallel to the guide rail. The inside of the driving ring is divided into multiple identical fan-shaped spaces by partitions. Inside each fan-shaped space, the electromagnet, the mounting block, the connecting piece, and the thermal expansion element are sequentially arranged from outside to inside along the radial direction of the driving ring. The mounting block is provided with a first contact piece connected to the electromagnet and a second contact piece connected to an external power supply. One end of the thermal expansion element is close to the ball mill body, and the other end is connected to the connecting piece. The connecting piece is a conductive metal sheet. The thermal expansion element is used to drive the connecting piece to approach or move away from the mounting block. A permanent magnet is arranged inside the mounting box.

[0012] Optionally, the cooling mechanism includes a mounting plate, a water-absorbing sponge, a water storage tank, and a water delivery pipe. One side of the mounting box facing the ball mill body is open. A receiving groove is formed through the mounting box parallel to the axis of the ball mill body. The mounting plate is slidably arranged inside the mounting box through the receiving groove, and the mounting plate extends in the direction parallel to the axis of the ball mill body. The water-absorbing sponge is arranged on the mounting plate. The mounting plate is provided with a water seepage pipe with multiple water seepage holes, and the water seepage pipe is buried in the water-absorbing sponge. The water storage tank is arranged on one side of the ball mill body, and a water pump is connected to the water storage tank. One end of the water delivery pipe is connected to the water seepage pipe, and the other end is connected to the water pump. The water delivery pipe is a flexible pipe. A moving component is further arranged on the mounting box. The moving component is connected to the mounting plate and is used to drive the mounting plate to approach or move away from the ball mill body.

[0013] Optionally, the side of the water-absorbing sponge close to the ball mill body is set as an arc surface parallel to the outer wall of the ball mill body.

[0014] Optionally, the moving component includes a cylinder. The cylinder is arranged inside the mounting box, and the piston rod of the cylinder extends towards the mounting plate and is fixedly connected to the mounting plate.

[0015] Optionally, multiple mounting frames are arranged outside the ball mill body. Multiple mounting boxes are located on the same horizontal line, and the mounting plate passes through multiple mounting boxes at the same time.

[0016] On the other hand, the present application also provides a self-powder ball milling system, adopting the following technical solution:

[0017] Adopting the above self-grinding ball mill, it further includes a jaw crusher, a hoist, and a raw material bin that are sequentially connected and arranged on the feeding side of the ball mill body; a cylindrical screen, a dust collector, and a material taking port that are sequentially connected and arranged on the discharging side of the ball mill body. The raw material bin is communicated with the feeding port of the ball mill body, and the cylindrical screen is connected to the discharging port of the ball mill body.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. During the operation of the ball mill body, the installation box is installed on the installation frame, and the ball mill body is cooled by the cooling mechanism installed on the installation box. When the ball mill body grinds different materials, the rotation speed of the drum is different, and the accumulation point of the materials in the drum is also different. Therefore, the position of the point with the highest temperature in the drum is different when facing different materials. The installation box is driven by the driving mechanism to move on the guide rail, so that the cooling mechanism is always located at the highest temperature point of the ball mill body, making the cooling effect of the cooling mechanism good and improving the problem that the friction heat of the materials during the use of the ball mill affects the grinding effect;

[0020] 2. Start the driving motor, the driving motor drives the gear to rotate, thereby driving the gear to move along the rack, and then driving the installation box to move along the guide rail, achieving the effect of facilitating the driving of the cooling mechanism to move along the guide rail;

[0021] 3. The side of the water-absorbing sponge facing the ball mill body is an arc surface, and the arc surface is parallel to the outer wall of the ball mill body, so that the water-absorbing sponge can fit more closely with the outer wall of the ball mill body, and at the same time, the contact area between the water-absorbing sponge and the outer wall of the ball mill body is larger, making the cooling effect of the ball mill body better. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present application.

[0023] Figure 2 It is a schematic diagram for showing the structure of the installation frame in Embodiment 1 of the present application.

[0024] Figure 3 It is a cross-sectional view for showing the structure of the installation box in Embodiment 1 of the present application.

[0025] Figure 4 It is a schematic diagram for showing the structure of the installation plate and the water-absorbing sponge in Embodiment 1 of the present application.

[0026] Figure 5 It is a schematic diagram for showing the driving mechanism in Embodiment 3 of the present application.

[0027] Figure 6It is a schematic diagram for showing the internal structure of the driving ring in Embodiment 3 of the present application.

[0028] Explanation of reference numerals:

[0029] 1. Ball mill body; 2. Mounting frame; 21. Guide rail; 3. Mounting box; 31. Clamping groove; 32. Steel ball; 33. Accommodating groove; 4. Cooling mechanism; 41. Mounting plate; 42. Water-absorbing sponge; 421. Tank; 43. Water storage tank; 44. Water delivery pipe; 45. Water seepage pipe; 46. Water pump; 47. Cylinder; 5. Driving mechanism; 51. Rack; 52. Gear; 53. Driving motor; 54. Driving ring; 55. Mounting block; 551. First contact piece; 552. Second contact piece; 56. Electromagnet; 57. Thermal expansion element; 58. Connecting piece; 59. Partition; 6. Blower. Detailed implementation manners

[0030] The following further Figure 1-6 describes the present application in detail.

[0031] Embodiment 1:

[0032] Embodiment 1 of the present application discloses a self-grinding ball mill. Referring to Figure 1 and Figure 2 , a self-grinding ball mill and a self-grinding ball mill system include a ball mill body 1. The ball mill body 1 mainly includes bases at both ends and a drum rotatably connected between the bases. Related equipment for driving the drum to rotate is arranged in the bases. The self-grinding ball mill further includes a mounting frame 2, a mounting box 3, a cooling mechanism 4, and a driving mechanism 5. The mounting frame 2 is a portal frame covering the drum of the ball mill body 1. A guide rail 21 is installed on the mounting frame 2. The guide rail 21 is annular and coaxially arranged with the drum of the ball mill body 1, that is, the guide rail 21 is parallel to the outer wall of the ball mill body 1. The mounting box 3 is slidably installed on the guide rail 21. The cooling mechanism 4 is installed on the mounting box 3 and contacts the ball mill body 1. The cooling mechanism 4 is used to cool down the ball mill body 1. The driving mechanism 5 is installed on the guide rail 21 and connected to the mounting box 3. The driving mechanism 5 is used to drive the mounting box 3 to move on the guide rail 21, so as to drive the mounting box 3 to move around the ball mill body 1.

[0033] During the operation of the ball mill body 1, the materials inside the ball mill body 1 generate heat through friction. The installation box 3 is installed on the installation frame 2, and the cooling mechanism 4 installed on the installation box 3 cools down the ball mill body 1. Since the rotation speed of the drum is different when the ball mill body 1 grinds different materials, and the adhesiveness between different material powders is also different, the moving range of the materials inside the drum is different. As a result, the position of the hottest point inside the drum is different when facing different materials. The driving mechanism 5 drives the installation box 3 to move on the guide rail 21, so that the cooling mechanism 4 is always located at the hottest point of the ball mill body 1, making the cooling effect of the cooling mechanism 4 good and improving the problem that the friction heat of the materials during the use of the ball mill affects the grinding effect.

[0034] Refer to Figure 2 and Figure 3 , the cross-sectional shape of the guide rail 21 is T-shaped. The guide rail 21 is connected and installed inside the installation frame 2 through multiple connecting rods. A clamping groove 31 with a T-shaped cross-section and adapted to the guide rail 21 is opened at the top of the installation box 3. The installation box 3 is slidably installed on the guide rail 21 through the clamping groove 31. Thus, while facilitating the clamping and installation of the installation box 3 onto the guide rail 21, it is also convenient to drive the installation box 3 to move along the guide rail 21.

[0035] Refer to Figure 3 , steel balls 32 are embedded on the side walls of the clamping groove 31 inside the installation box 3 on both sides of the guide rail 21, and both sides of the guide rail 21 are in contact with the steel balls 32. The steel balls 32 convert the sliding friction between the guide rail 21 and the installation box 3 into rolling friction, reducing the frictional resistance when the installation box 3 moves on the guide rail 21 and facilitating the driving of the installation box 3 to move on the guide rail 21.

[0036] Refer to Figure 3 , the driving mechanism 5 includes a rack 51, a gear 52 and a driving motor 53. The rack 51 is also annular. The rack 51 is fixedly installed inside the guide rail 21. The driving motor 53 is installed on the installation box 3. An installation cavity communicating with the clamping groove 31 is opened inside the installation box 3. The output shaft of the driving motor 53 extends into the installation cavity inside the installation box 3. The gear 52 is rotatably arranged on the installation box 3 and is located inside the installation cavity, and the gear 52 is coaxially and fixedly connected to the output shaft of the driving motor 53. The gear 52 meshes with the rack 51. Start the driving motor 53, and the output shaft of the driving motor 53 drives the gear 52 to rotate, thereby driving the gear 52 to move along the pre-meshed rack 51, and then driving the installation box 3 to move along the guide rail 21. It realizes the effect of facilitating the driving of the cooling mechanism 4 to move along the guide rail 21 around the ball mill body 1.

[0037] Refer to Figure 1 and Figure 3, the cooling mechanism 4 includes a mounting plate 41, a water-absorbing sponge 42, a water storage tank 43 and a water delivery pipe 44. One side of the mounting box 3 facing the ball mill body 1 is open, and a receiving groove 33 is formed through the side of the mounting box 3 facing the ball mill body 1 in parallel with the axis direction of the ball mill body 1. The mounting plate 41 is slidably mounted in the mounting box 3 through the receiving groove 33. The mounting plate 41 extends in the direction parallel to the axis of the ball mill body 1, and the length of the mounting plate 41 is the same as the length of the drum of the ball mill body 1. The water-absorbing sponge 42 is fixedly mounted on the side of the mounting plate 41 facing the ball mill body 1. Refer to Figure 4 , a water seepage pipe 45 is mounted on the side of the mounting plate 41 facing the ball mill body 1 along the length direction of the mounting plate 41. Both ends of the water seepage pipe 45 are closed, and a plurality of water seepage holes are formed in the water seepage pipe 45. When the water-absorbing sponge 42 is mounted on the mounting plate 41, the water seepage pipe 45 is buried in the water-absorbing sponge 42. The water storage tank 43 is mounted on one side of the ball mill body 1, and a water pump 46 is connected and communicated on the water storage tank 43. One end of the water delivery pipe 44 is connected and communicated with the middle of the water seepage pipe 45, and the other end is connected with the output end of the water pump 46. The water delivery pipe 44 is a flexible pipe, and during the rotation of the mounting box 3, the water delivery pipe 44 can undergo a certain deformation. It should be noted that the mounting box 3 should be prevented from rotating in the same direction by more than 180°. By controlling the rotation direction of the mounting box 3 and adjusting the position of the mounting box 3, the water delivery pipe 44 can be prevented from winding around the ball mill body.

[0038] The water-absorbing sponge 42 abuts against the outer wall of the ball mill body 1. Start the water pump 46, and the water pump 46 transports the water in the water storage tank 43 to the water seepage pipe 45 through the water delivery pipe 44. The water in the water seepage pipe 45 flows out through the water seepage holes and wets the water-absorbing sponge 42. The wet water-absorbing sponge 42 contacts the ball mill body 1, and the heat of the drum of the ball mill body 1 is transferred to the water-absorbing sponge 42. The water in the water-absorbing sponge 42 evaporates and takes away heat. Adjust the water output of the water pump 46 so that the water-absorbing sponge 42 is always in a wet state, and at the same time, avoid wasting water due to excessive cooling water input into the water-absorbing sponge 42. At the same time, the outer wall of the ball mill body 1 passing through the water-absorbing sponge 42 is wetted, and the evaporation of the water on the surface of the ball mill body 1 will also take away heat, thereby realizing the cooling of the ball mill body 1.

[0039] Refer to Figure 3, a moving component is also installed on the installation box 3. The moving component is connected to the mounting plate 41 and is used to drive the mounting plate 41 to approach or move away from the ball mill body 1, so as to drive the water-absorbing sponge 42 to contact or disengage from the outer wall of the ball mill body 1. The moving component includes a cylinder 47. Moving grooves are formed on both sides of the accommodating groove 33 inside the installation box 3. The cylinder 47 is inside the installation box 3 and located in the moving groove, and the cylinder 47 is installed on both sides of the installation box 3. The piston rod of the cylinder 47 extends towards the mounting plate 41 and is fixedly connected to the mounting plate 41. Synchronously start the two cylinders 47, and the piston rods of the two cylinders 47 extend or retract synchronously, so as to drive the mounting plate 41 to approach or move away from the ball mill body 1, so as to facilitate driving the water-absorbing sponge 42 on the mounting plate 41 to fit or move away from the outer wall of the ball mill body 1.

[0040] The implementation principle of a self-powder ball mill in Embodiment 1 of the present application is as follows: During the operation of the ball mill body 1, the materials inside the ball mill body 1 generate heat. The installation box 3 is installed on the installation frame 2. Start the driving motor 53 to drive the installation box 3 to move to the place with the highest temperature of the ball mill body 1, and drive the mounting plate 41 to move so that the water-absorbing sponge 42 fits against the outer wall of the ball mill body 1. Start the water pump 46, and the water pump 46 transports the water in the water storage tank 43 to the water seepage pipe 45 through the water delivery pipe 44. The water in the water seepage pipe 45 flows out and wets the water-absorbing sponge 42, so as to cool the ball mill body 1 through the wet water-absorbing sponge 42. At the same time, the ball mill body 1 passing through the water-absorbing sponge 42 will be wetted, and the heat will also be taken away when the water on the outer wall of the ball mill body 1 evaporates, so as to cool the ball mill body 1 and improve the problem that the friction heat of the materials during the use of the ball mill affects the grinding effect.

[0041] Embodiment 2:

[0042] Refer to Figure 3 and Figure 4 , the side of the water-absorbing sponge 42 close to the ball mill body 1 is set as an arc surface parallel to the outer wall of the ball mill body 1. The arc surface parallel to the outer wall of the ball mill body 1 is provided on the water-absorbing sponge 42, so that the water-absorbing sponge 42 can fit more closely against the outer wall of the ball mill body 1, and at the same time, the contact area between the water-absorbing sponge 42 and the outer wall of the ball mill body 1 is larger, so that the cooling range of the outer wall of the ball mill body 1 is larger, and the cooling effect of the ball mill body 1 is better. Combined with Figure 1 , a plurality of bolts for connecting the drum lining plate protrude regularly outside the ball mill body 1. A plurality of grooves 421 opposite to the bolts on the ball mill body 1 are formed on the water-absorbing sponge 42. When the drum of the ball mill body 1 rotates, the bolts pass through the grooves 421, so that the bolts will not damage the water-absorbing sponge 42 when the ball mill body 1 rotates, and the service life of the water-absorbing sponge 42 is extended.

[0043] Refer toFigure 1 Outside the ball mill body 1, there are multiple mounting brackets 2. The multiple mounting brackets 2 have the same structure and are facing each other. The mounting boxes 3 on the multiple mounting brackets 2 are located on the same horizontal line, and the mounting plate 41 passes through the multiple mounting boxes 3 at the same time. The multiple mounting brackets 2 make the overall structure more stable and improve the stability of the overall structure.

[0044] Embodiment 3:

[0045] Referring to Figure 5 and Figure 6 The driving mechanism 5 includes a driving ring 54, a mounting block 55, an electromagnet 56, a thermal expansion member 57, and a connecting piece 58. The driving ring 54 is an annular plate body, and the driving ring 54 is a hollow plate body with an opening on the inner side. A plurality of partition plates 59 are arranged at equal intervals inside the driving ring 54, and the plurality of partition plates 59 are all arranged along the radial direction of the driving ring 54. Thus, the plurality of partition plates 59 divide the interior of the driving ring 54 into a plurality of identical fan-shaped spaces. An electromagnet 56, a mounting block 55, a connecting piece 58, and a thermal expansion member 57 are all installed on the driving ring 54 and located in the plurality of fan-shaped spaces. The electromagnet 56, the mounting block 55, the connecting piece 58, and the thermal expansion member 57 are arranged in the direction from the outer diameter to the inner diameter of the driving ring 54 in sequence. The electromagnet 56 faces the mounting box 3, and a permanent magnet is arranged in the mounting box 3. The mounting block 55 is an arc-shaped block body. A first contact piece 551 and a second contact piece 552 are arranged on the side of the mounting block 55 facing the ball mill body 1. The first contact piece 551 is electrically connected to the electromagnet 56, and the second contact piece 552 is connected to an external power supply. The connecting piece 58 is a conductive metal sheet, and the connecting piece 58 is also arc-shaped. There is a gap between the connecting piece 58 and the first contact piece 551 and the second contact piece 552. One end of the thermal expansion member 57 is close to the outer wall of the ball mill body 1, and the other end is connected to the connecting piece 58. The thermal expansion member 57 includes an airbag and a gas that is easily expandable when heated inside the airbag, such as oxygen or hydrogen.

[0046] When the ball mill body 1 operates, the materials inside the ball mill body 1 rub and generate heat. Due to the different types of materials, the adhesion between the materials is different, so that the rising height of the materials in the ball mill body 1 is different, and the highest temperature point on the ball mill body 1 also varies; at this time, the temperature inside the airbag at the highest temperature point of the ball mill body 1 is the highest, the gas volume changes, and the airbag volume increases the most. Thus, the connecting piece 58 is pushed and abutted against the first contact piece 551 and the second contact piece 552. The connecting piece 58 connects the first contact piece 551 and the second contact piece 552. The electromagnet 56 is energized and generates an attractive force on the permanent magnet in the mounting box 3, driving the mounting box 3 to move to be opposite to the activated electromagnet 56. Thus, the cooling mechanism 4 continuously cools the highest temperature point on the ball mill body 1.

[0047] Embodiment 4:

[0048] Embodiment 4 of the present application discloses a self-powder ball mill system, including the above-mentioned self-powder ball mill, and also including a jaw crusher, an elevator and a raw material bin which are sequentially connected to the feeding side of the ball mill body 1, and a cylindrical screen, a dust collector and a material taking port which are sequentially connected to the discharging side of the ball mill body 1. The raw material bin is connected to the feeding port of the ball mill body 1, and the cylindrical screen is connected to the discharging port of the ball mill body 1. The cylindrical screen is a vibrating cylindrical screen, and the ground material vibrates when passing through the vibrating cylindrical screen to avoid clogging the sieve holes. The dust collecting duct of the dust collector has a diameter of 320 mm, which is a significant improvement over the currently common dust collecting duct size, and increases the air extraction volume of the dust collector fan.

[0049] During the operation of the self-grinding ball mill system, the block raw materials are crushed by the jaw crusher and then transported to the raw material bin by the elevator. The raw materials are transported to the ball mill body 1 by controlling the discharge of the raw material bin. The raw materials are self-grinded by the ball mill body 1. The ground materials are output through the discharge port of the ball mill body 1 and enter the drum screen. The drum screen screens the materials, and the screened materials are taken out through the sampling port.

[0050] At the same time, a blower 6 is provided on one side of the ball mill body 1, and the output end of the blower 6 is connected to the inside of the ball mill body 1. The blower 6 blows air into the ball mill body 1 to promote the heat dissipation inside the blower 6, thereby further improving the cooling effect of the ball mill body 1.

[0051] Finally, it should be noted that in the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-grinding ball mill, comprising a ball mill body (1), characterized in that: It further includes a mounting frame (2), a mounting box (3), a cooling mechanism (4) and a driving mechanism (5). The mounting frame (2) covers the outside of the ball mill body (1). A guide rail (21) parallel to the outer wall of the ball mill body (1) is provided on the mounting frame (2). The mounting box (3) is slidably arranged on the guide rail (21). The cooling mechanism (4) is arranged on the mounting box (3) and is in contact with the ball mill body (1). The cooling mechanism (4) is used to cool down the ball mill body (1). The driving mechanism (5) is arranged on the guide rail (21) and is connected to the mounting box (3). The driving mechanism (5) is used to drive the mounting box (3) to move around the ball mill body (1) on the guide rail (21); The cross-section of the guide rail (21) is T-shaped, and a clamping groove (31) adapted to the guide rail (21) is opened at the top of the mounting box (3); The driving mechanism (5) includes a driving ring (54), a mounting block (55), an electromagnet (56), a thermal expansion element (57) and a connecting piece (58). The driving ring (54) is connected to the mounting frame (2). The driving ring (54) is an annular hollow plate body covering the outside of the ball mill body (1) and parallel to the guide rail (21). The inside of the driving ring (54) is divided into a plurality of identical fan-shaped spaces by a partition plate (59). In each fan-shaped space, the electromagnet (56), the mounting block (55), the connecting piece (58) and the thermal expansion element (57) are sequentially arranged from outside to inside along the radial direction of the driving ring (54). A first contact piece (551) connected to the electromagnet (56) and a second contact piece (552) connected to an external power supply are provided on the mounting block (55). One end of the thermal expansion element (57) is close to the ball mill body (1), and the other end is connected to the connecting piece (58). The connecting piece (58) is a conductive metal sheet. The thermal expansion element (57) is used to drive the connecting piece (58) to approach or move away from the mounting block (55). A permanent magnet is arranged in the mounting box (3); The cooling mechanism (4) includes a mounting plate (41), a water-absorbing sponge (42), a water storage tank (43) and a water delivery pipe (44). One side of the mounting box (3) facing the ball mill body (1) is open. A receiving groove (33) is formed in the mounting box (3) parallel to the axis of the ball mill body (1) and penetrating through it. The mounting plate (41) is slidably arranged in the mounting box (3) through the receiving groove (33), and the mounting plate (41) extends in a direction parallel to the axis of the ball mill body (1). The water-absorbing sponge (42) is arranged on the mounting plate (41). A water seepage pipe (45) with a plurality of water seepage holes is arranged on the mounting plate (41), and the water seepage pipe (45) is buried in the water-absorbing sponge (42). The water storage tank (43) is arranged on one side of the ball mill body (1), and a water pump (46) is connected to the water storage tank (43). One end of the water delivery pipe (44) is connected to the water seepage pipe (45), and the other end is connected to the water pump (46). The water delivery pipe (44) is a flexible pipe. A moving component is further arranged on the mounting box (3), and the moving component is connected to the mounting plate (41) and is used to drive the mounting plate (41) to approach or move away from the ball mill body (1).

2. The self-powder ball mill according to claim 1, wherein: Steel balls (32) are embedded on both sides of the mounting box (3) and located on both sides of the guide rail (21).

3. The self-grinding ball mill according to claim 1, characterized in that: The side of the water-absorbing sponge (42) close to the ball mill body (1) is set as an arc surface parallel to the outer wall of the ball mill body (1).

4. The self-pulverizing ball mill according to claim 1, wherein: The moving component includes a cylinder (47). The cylinder (47) is arranged in the mounting box (3), and the piston rod of the cylinder (47) extends towards the mounting plate (41) and is fixedly connected to the mounting plate (41).

5. The self-powder ball mill according to claim 1, wherein: A plurality of mounting frames (2) are arranged outside the ball mill body (1). A plurality of the mounting boxes (3) are on the same horizontal line, and the mounting plate (41) passes through a plurality of the mounting boxes (3) at the same time.

6. A self-powder ball milling system, characterized in that: For the self-grinding ball mill according to any one of the above claims 1-5, it further includes a jaw crusher, a hoist and a raw material bin which are sequentially connected and arranged on the feeding side of the ball mill body (1); a cylindrical screen, a dust collector and a material taking port which are sequentially connected and arranged on the discharging side of the ball mill body (1). The raw material bin is communicated with the feeding port of the ball mill body (1), and the cylindrical screen is communicated with the discharging port of the ball mill body (1).

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