Special permanent magnet motor rotor for ball mill

Abstract

The utility model relates to a special permanent magnet motor rotor for a ball mill, which comprises a rotor shaft unit, a rotor iron core, a first pressing plate, a second pressing plate and a baffle plate, the rotor shaft unit is fixedly arranged on the rotor iron core in a penetrating manner, the rotor iron core is provided with a plurality of magnetic steel grooves, the plurality of magnetic steel grooves are distributed along the circumferential direction of the rotor iron core at intervals, and the first pressing plate and the second pressing plate are arranged on the baffle plate. The first pressing plate is fixedly installed between the rotor shaft unit and the upper end of the rotor core and just exposes the upper opening of the magnetic steel groove, and the second pressing plate is fixedly installed between the rotor shaft unit and the lower end of the rotor core and completely covers the lower opening of the magnetic steel groove. The baffle plate is fixedly installed on the first pressing plate and can shield the upper opening of the magnetic steel groove. After the scheme is adopted, the assembling efficiency of the rotor can be effectively improved, the problems of falling apart of the rotor punching sheets and rebounding of the magnetic steel in the assembling process are avoided, and the firm rotor structure can effectively prolong the service life of the rotor.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotors, in particular to a permanent magnet motor rotor dedicated to a ball mill. Background Art

[0002] Ball mill is the key equipment for crushing materials after they are broken. It is widely used in cement, silicate products, new building materials, refractory materials, fertilizers, ferrous and non-ferrous metal beneficiation, glass and ceramics and other production industries. It can grind various ores and other grindable materials by dry or wet method. Permanent magnet motor is a new type of motor that uses permanent magnets to generate magnetic field. Compared with traditional motors, it has higher efficiency, greater output torque, smaller size and weight, so it is also often used in ball mills.

[0003] In a permanent magnet motor, the rotor is the core component for generating magnetic field and converting energy. Since the permanent magnet motor used in the ball mill needs to have strong magnetism, magnets with strong magnetism are installed in the rotor. However, during the installation of the magnets, due to the repulsion of like poles, the rotor punchings are very likely to fall apart, and when the magnets are installed, they are very likely to rebound, which greatly reduces the assembly efficiency of the rotor. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a permanent magnet motor rotor dedicated to a ball mill, which can effectively improve the assembly efficiency of the rotor, avoid the problems of rotor punchings falling apart and magnetic steel rebounding during the assembly process, and the firm rotor structure can effectively increase the life of the rotor and reduce maintenance costs.

[0005] In order to solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0006] A permanent magnet motor rotor for a ball mill comprises a rotor shaft unit, a rotor core, a first pressure plate, a second pressure plate and a baffle, wherein the rotor shaft unit is fixedly arranged on the rotor core, a plurality of magnetic steel slots are arranged on the rotor core, and the plurality of magnetic steel slots are distributed at intervals along the circumference of the rotor core, the first pressure plate is fixedly installed between the rotor shaft unit and the upper end of the rotor core and just exposes the upper opening of the magnetic steel slot, the second pressure plate is fixedly installed between the rotor shaft unit and the lower end of the rotor core and completely covers the lower opening of the magnetic steel slot, and the baffle is fixedly installed on the first pressure plate and can cover the upper opening of the magnetic steel slot.

[0007] Preferably, the rotor shaft unit includes a rotor center axis and an end plate, the inner side surface of the end plate is fixedly connected to the rotor center axis, the outer side surface of the end plate is in contact with the inner wall of the rotor core, the end plate is provided with multiple end plates and distributed at intervals along the circumference of the rotor center axis, a protrusion is fixedly provided at the lower end of the end plate, the upper end of the protrusion can abut against the lower end of the second pressure plate, a first keyway is provided on the inner wall of the rotor core, a second keyway is provided on the end plate, and the first keyway corresponds to the second keyway.

[0008] Preferably, it also includes a B-type key, the upper end of the end plate is provided with a first groove, the B-type key is installed in the first groove, the upper surface of the B-type key contacts the inner wall of the first groove, and the lower surface of the B-type key contacts the upper surface of the first pressure plate.

[0009] Preferably, a lifting hole is provided on the end plate.

[0010] Preferably, a plurality of second grooves are provided on the outer wall of the rotor core, and the plurality of second grooves correspond one-to-one to the two side walls of the plurality of magnetic steel slots.

[0011] Preferably, the rotor core is formed by stacking a plurality of rotor punching sheets along the axial direction of the rotor shaft unit.

[0012] The beneficial effect of the utility model is that when assembling the rotor, the first pressing plate and the second pressing plate are first installed at the upper end and the lower end of the rotor core respectively, the first pressing plate is first pressed on the upper end of the rotor core to facilitate the adjustment of the components during the installation process, the first pressing plate will expose the upper opening of the magnetic steel slot after being pressed on the rotor core, the second pressing plate is welded to the lower end of the rotor core and will block the lower opening of the magnetic steel slot, and then the rotor shaft unit is placed in the rotor core; then the magnetic steel is sequentially placed in the magnetic steel slot from the upper opening of the magnetic steel slot as required, and each time two adjacent magnetic steels are inserted, it is necessary to place the first pressing plate on the magnetic steel slot. A baffle is installed on the rotor to block the upper opening of the magnetic steel slot. The baffle is installed by fixing the baffle, the first pressure plate and the rotor core with bolts. Repeating this operation will block the upper openings of all the magnetic steel slots. After installation, the rotor shaft unit is fixed on the rotor core. At this time, the rotor shaft unit just rests on the first pressure plate and the second pressure plate. In this way, the assembly efficiency of the rotor can be effectively improved, and the problems of rotor punching falling apart and magnetic steel rebounding during the assembly process can be avoided. In addition, the solid rotor structure can effectively increase the life of the rotor and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0014] Figure 1The structure diagram of the permanent magnet motor rotor for ball mill of the utility model (1) is shown;

[0015] Figure 2 for Figure 1 A local enlarged view of the area marked A;

[0016] Figure 3 This is a structural schematic diagram of the permanent magnet motor rotor for ball mills according to the utility model (2);

[0017] Figure 4 This is a schematic diagram of the structure of the rotor shaft unit in the permanent magnet motor rotor for ball mills of the utility model;

[0018] Figure 5 The utility model is a schematic diagram of the structure of the rotor core in the permanent magnet motor rotor for ball mill.

[0019] in:

[0020] 1- rotor shaft unit; 11- rotor center axis; 12- end plate; 121- bump; 122- hoisting hole; 123- first groove; 124- second keyway;

[0021] 2- rotor core; 21- magnetic steel slot; 22- first key slot;

[0022] 3- first pressing plate;

[0023] 4- second pressing plate;

[0024] 5-Baffle;

[0025] 6-B type bond;

[0026] 7- Second groove. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] In the description of the present invention, it is necessary to understand that the directions and positional relationships indicated by “up”, “down”, “left”, “right”, “front”, “back”, “vertical”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] like Figures 1 to 5 As shown,

[0030] A permanent magnet motor rotor for a ball mill comprises a rotor shaft unit 1, a rotor core 2, a first pressure plate 3, a second pressure plate 4 and a baffle 5. The rotor shaft unit 1 is fixedly penetrated on the rotor core 2. The rotor core 2 is provided with a plurality of magnetic steel slots 21. The plurality of magnetic steel slots 21 are distributed at intervals along the circumference of the rotor core 2. The first pressure plate 3 is fixedly installed between the rotor shaft unit 1 and the upper end of the rotor core 2 and just exposes the upper opening of the magnetic steel slot 21. The second pressure plate 4 is fixedly installed between the rotor shaft unit 1 and the lower end of the rotor core 2 and completely covers the lower opening of the magnetic steel slot 21. The baffle 5 is fixedly installed on the first pressure plate 3 and can cover the upper opening of the magnetic steel slot 21.

[0031] In this way, when assembling the rotor, the first pressing plate 3 and the second pressing plate 4 are first installed at the upper end and the lower end of the rotor core 2 respectively. The first pressing plate 3 is first pressed on the upper end of the rotor core 2 to facilitate the adjustment of the components during the installation process. After the first pressing plate 3 is pressed on the rotor core 2, the upper opening of the magnetic steel slot 21 will be exposed, and the second pressing plate 4 is welded to the lower end of the rotor core 2 and will block the lower opening of the magnetic steel slot 21. Then, the rotor shaft unit 1 is placed in the rotor core 2; then, the magnetic steel is sequentially placed from the upper opening of the magnetic steel slot 21 into the magnetic steel slot 21 as required. Every time two adjacent magnetic steels are inserted, it is necessary to place the first pressing plate 3 on the rotor core 2. The baffle 5 is installed to block the upper opening of the magnetic steel slot 21 with the baffle 5. The installation method of the baffle 5 is to use bolts to fix the baffle 5, the first pressure plate 3 and the rotor core 2 together. Repeating this operation will block the upper openings of all magnetic steel slots 21. After installation, the rotor shaft unit 1 is fixedly installed on the rotor core 2. At this time, the rotor shaft unit 1 just rests on the first pressure plate 3 and the second pressure plate 4. In this way, the assembly efficiency of the rotor can be effectively improved, and the problems of rotor punching falling apart and magnetic steel rebounding during the assembly process can be avoided. The firm rotor structure can effectively increase the life of the rotor and reduce maintenance costs. By dividing the magnetic steel slot 21 into multiple pieces, smaller magnetic steels can be used for installation operations, making installation more convenient and less likely to pinch your hands.

[0032] In addition, the rotor shaft unit 1 includes a rotor central axis 11 and an end plate 12, the inner side of the end plate 12 is fixedly connected to the rotor central axis 11, the outer side of the end plate 12 is in contact with the inner wall of the rotor core 2, the end plate 12 is provided with a plurality of protrusions 121 which are distributed at intervals along the circumference of the rotor central axis 11, the lower end of the end plate 12 is fixedly provided with a protrusion 121, the upper end of the protrusion 121 can be abutted against the lower end of the second pressure plate 4, the inner wall of the rotor core 2 is provided with a first keyway 22, the end plate 12 is provided with a second keyway 124, and the first keyway 22 corresponds to the second keyway 124. Specifically, one end of the key is inserted into the second keyway 124, and then the other end of the key is matched with the first keyway 22, so that the connection between the rotor shaft unit 1 and the rotor core 2 is completed; after the rotor shaft unit 1 is installed, the protrusion 121 will be firmly abutted against the second pressure plate 4.

[0033] In this way, the rotor shaft unit 1 can be firmly connected to the rotor core 2 and can move simultaneously; replacing the original solid rotor shaft with a hollow design of a rotor center shaft 11 plus an end plate 12 can effectively reduce the overall weight of the rotor.

[0034] In addition, a B-type key 6 is included. A first groove 123 is provided at the upper end of the end plate 12. The B-type key 6 is installed in the first groove 123. The upper surface of the B-type key 6 contacts the inner wall of the first groove 123, and the lower surface of the B-type key 6 contacts the upper surface of the first pressing plate 3. Specifically, since the permanent magnet will lose its magnetism when it encounters high temperature, the first pressing plate 3 cannot be further fixed by welding after the magnetic steel is inserted, so the B-type key 6 is used to press the first pressing plate 3 instead.

[0035] In this way, in cooperation with the protrusion 121 at the lower end of the rotor shaft unit 1, the rotor shaft unit 1 will firmly press the first pressing plate 3, thereby further effectively preventing the rotor punching from falling apart.

[0036] In addition, a lifting hole 122 is provided on the end plate 12 .

[0037] In this way, the hoisting operation of the rotor shaft unit 1 is facilitated.

[0038] In addition, a plurality of second grooves 7 are provided on the outer wall of the rotor core 2 , and the plurality of second grooves 7 correspond one-to-one to the two side walls of the plurality of magnetic steel slots 21 .

[0039] This makes it easier to distinguish the magnetic poles on the rotor.

[0040] In addition, the rotor core 2 is formed by laminating a plurality of rotor punching sheets along the axial direction of the rotor shaft unit 1 .

[0041] In this way, the manufacture of the rotor core 2 is simplified. If a punching sheet is damaged during the lamination process, a new punching sheet can be replaced, thereby reducing the manufacturing cost of the rotor core 2.

[0042] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet motor rotor for a ball mill, characterized in that: The invention comprises a rotor shaft unit (1), a rotor core (2), a first pressure plate (3), a second pressure plate (4) and a baffle (5), wherein the rotor shaft unit (1) is fixedly arranged on the rotor core (2), a plurality of magnetic steel slots (21) are arranged on the rotor core (2), and the plurality of magnetic steel slots (21) are distributed at intervals along the circumference of the rotor core (2), the first pressure plate (3) is fixedly installed between the rotor shaft unit (1) and the upper end of the rotor core (2) and just exposes the upper opening of the magnetic steel slot (21), the second pressure plate (4) is fixedly installed between the rotor shaft unit (1) and the lower end of the rotor core (2) and completely covers the lower opening of the magnetic steel slot (21), and the baffle (5) is fixedly installed on the first pressure plate (3) and can cover the upper opening of the magnetic steel slot (21).

2. The permanent magnet motor rotor for ball mill according to claim 1, characterized in that: The rotor shaft unit (1) comprises a rotor central axis (11) and an end plate (12), wherein the inner side surface of the end plate (12) is fixedly connected to the rotor central axis (11), and the outer side surface of the end plate (12) is in contact with the inner wall of the rotor core (2), and the end plate (12) is provided with a plurality of protrusions (121) which are distributed at intervals along the circumference of the rotor central axis (11), and the lower end of the end plate (12) is fixedly provided with a protrusion (121), and the upper end of the protrusion (121) can abut against the lower end of the second pressure plate (4), and the inner wall of the rotor core (2) is provided with a first keyway (22), and the end plate (12) is provided with a second keyway (124), and the first keyway (22) corresponds to the second keyway (124).

3. The permanent magnet motor rotor for ball mill according to claim 2, characterized in that: It also includes a B-type key (6), the upper end of the end plate (12) is provided with a first groove (123), the B-type key (6) is installed in the first groove (123), the upper surface of the B-type key (6) contacts the inner wall of the first groove (123), and the lower surface of the B-type key (6) contacts the upper surface of the first pressure plate (3).

4. The permanent magnet motor rotor for ball mill according to claim 2 or 3, characterized in that: The end plate (12) is provided with a lifting hole (122).

5. The permanent magnet motor rotor for ball mill according to claim 1, 2 or 3, characterized in that: A plurality of second grooves (7) are provided on the outer wall of the rotor core (2), and the plurality of second grooves (7) correspond one-to-one to the two side walls of the plurality of magnetic steel slots (21).

6. The permanent magnet motor rotor for ball mill according to claim 1, 2 or 3, characterized in that: The rotor core (2) is formed by stacking a plurality of rotor punching sheets along the axial direction of the rotor shaft unit (1).

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