Assembling method of permanent magnet semi-direct drive motor of large vertical mill

Abstract

The invention discloses an assembling method for a permanent magnet semi-direct-drive motor of a large vertical mill, which comprises the following steps of: completing the assembling of a motor rotor assembly, sleeving and rotationally connecting a supporting plate to the middle part of a motor main shaft, fixedly mounting a motor rotor on the motor main shaft, and forming at least two through holes in the motor rotor and the supporting plate; a motor stator assembly and guide rods with the same number as the through holes in the supporting plate are installed in the speed reducer box body. After the guide rod is aligned with the through holes in the motor rotor and the supporting plate, the motor main shaft is assembled in a sliding mode downwards along the guide rod till the motor rotor reaches the assembling position, the supporting plate is fixed to the speed reducer box body, the guide rod is disassembled, and assembling is completed. According to the invention, the speed reducer box body and the guide rod are vertically assembled, so that directional guiding in the assembling process of the motor rotor assembly can be realized, auxiliary equipment is not needed, the motor rotor assembly can be assembled in place at one time, the assembling convenience of the rotor and the stator of the large permanent magnet motor is improved, and the assembling cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet semi-direct drive motors for large vertical mills, and in particular to an assembly method for permanent magnet semi-direct drive motors for large vertical mills. Background Art

[0002] In recent years, in response to the national requirements for energy conservation and consumption reduction, some small vertical mill application enterprises have gradually transformed and optimized, eliminated the traditional vertical mill drive system (high-voltage asynchronous motor, coupling, vertical mill reducer and lubrication device), and replaced it with a permanent magnet semi-direct drive vertical mill transmission system. The large permanent magnet semi-direct drive vertical mill transmission system is mainly composed of a permanent magnet synchronous motor, a frequency converter, a single-stage or two-stage planetary gear transmission system, a lubrication system, etc.; the permanent magnet synchronous motor drives the planetary gear transmission system to reduce speed and then drives the millstone of the vertical mill to rotate.

[0003] The traditional permanent magnet semi-direct drive vertical mill transmission system makes the permanent magnet motor and the reducer into two complete products. The motor and the reducer housing are fixed together vertically by bolts and pins, and the drum gear coupling structure is used to connect them in series to achieve the integration of the two products. The deeply integrated large-scale vertical mill permanent magnet semi-direct drive system adopts another method. The stator of the permanent magnet motor is integrated on the reducer housing, and the rotor of the permanent magnet motor is assembled on the support plate inside the reducer housing. The clearance control between the rotor and stator of the permanent magnet motor is determined by the connection between the support plate and the gear box housing.

[0004] Regarding the above-mentioned related technologies, the inventor believes that due to the large magnetic attraction between the rotor and stator of a large permanent magnet motor, the size and weight of the rotor, stator and gearbox housing are large, and horizontal assembly cannot be achieved, so vertical assembly is the only option. However, due to the strong magnetic attraction of the magnet, the rotor will attract one side, which may cause the rotor and stator to be out of center, resulting in a large number of bearing damages during stator-rotor assembly, and the inner cylindrical surface of the stator and the outer cylindrical surface of the rotor may be easily damaged; secondly, manual assembly cannot be completed in one go, and auxiliary equipment such as a rubber hammer is required to knock it into place, and then it is fixed with bolts, and the assembly process is relatively cumbersome. Although a stator-rotor assembly machine can be purchased to assemble the rotor and stator, the purchase cost of the stator-rotor assembly machine is very high, and the cost of purchasing a stator-rotor assembly machine that can assemble the rotor and stator of a large permanent magnet motor will increase further. Summary of the invention

[0005] The problem to be solved by the present invention is how to conveniently assemble the rotor and stator of a large permanent magnet motor.

[0006] In order to achieve the above-mentioned invention object, the present invention provides an assembly method of a large vertical mill permanent magnet semi-direct drive motor, which adopts the following technical solution:

[0007] A method for assembling a large vertical mill permanent magnet semi-direct drive motor comprises the following steps:

[0008] The motor rotor assembly is assembled outside the reducer housing, the support plate is sleeved and rotatably connected to the middle of the motor main shaft, and the motor rotor is fixedly installed on the lower end surface of the motor main shaft, the motor rotor and the support plate are each provided with at least two through holes, and the through holes of the motor rotor and the support plate correspond to each other one by one and are arranged on the same central axis;

[0009] A motor stator assembly and guide rods having the same number as the through holes on the support plate are installed inside the reducer housing, and the guide rods are parallel to the axis of the motor stator assembly;

[0010] Move the motor spindle to the opening of the reducer housing, align the guide rod with the through holes on the motor rotor and the support plate, slide downward along the guide rod for assembly until the motor rotor reaches the assembly position with the motor stator assembly, then fix the support plate to the reducer housing, and finally remove the guide rod to complete the assembly of the motor rotor and the motor stator assembly.

[0011] By adopting the above technical solution, during the assembly process, at least two guide rods parallel to the motor stator assembly axis are fixed in the reducer housing to ensure that the motor rotor assembly is completely centered during the falling assembly process, reducing the magnetic attraction generated by the non-concentricity of the motor stator and the motor rotor assembly; at the same time, the guide rod can fully withstand the magnetic attraction generated between the motor stator and the motor rotor assembly without deformation, avoiding the damage to the magnetic steel caused by the contact between the motor stator and the rotor due to the magnetic attraction. In summary, the above assembly method can effectively ensure that the motor rotor assembly is assembled according to the established trajectory, avoid the possibility of contact between the motor stator and the motor rotor assembly, and realize the lossless installation of the stator and rotor of the large vertical mill permanent magnet semi-direct drive motor.

[0012] And through the cooperation of the reducer case, guide rods and vertical assembly method, it is possible to achieve directional guidance of the motor rotor assembly during assembly and withstand a large magnetic attraction force. No auxiliary equipment is required, and it can be assembled in one go. There is no need to purchase a stator and rotor assembly machine separately, which improves the convenience of assembling the rotor and stator of large permanent magnet motors and greatly reduces the assembly cost.

[0013] Optionally, a guide support is sleeved on the motor main shaft so that the guide support is placed on the support plate, and then the motor main shaft is moved to the opening of the reducer housing and assembled downward;

[0014] The lower side wall of the guide support is provided with at least two plug-in holes, and the number of the plug-in holes is set corresponding to the number of guide rods. When the guide rods are inserted into the plug-in holes one by one during the downward assembly process, the guide support is detachably installed on the reducer housing, and then the motor spindle housing is further assembled downward.

[0015] By adopting the above technical solution, the guide support is installed on the reducer housing, and the guide rod is inserted into the plug-in hole. The guide support and the reducer housing cooperate to limit and fix the guide rod, so that the guide rod can more stably withstand the magnetic attraction force, thereby stably centering and guiding the motor rotor assembly.

[0016] Optionally, when the guide rods are inserted into the insertion holes one by one, the guide supports just overlap the reducer housing, and at this time, the guide supports are bolted to the reducer housing.

[0017] By adopting the above technical solution, the guide support can be detachably installed on the reducer housing by fixing with bolts, and the installation is stable and the removal is convenient.

[0018] Optionally, a stop structure is provided at the overlap between the guide support and the reducer housing.

[0019] By adopting the above technical solution, the guide support can be radially positioned relative to the reducer housing through the stop structure at the overlap, so as to facilitate the alignment of the screw holes on the guide support and the reducer housing, thereby improving the convenience of installing the guide support; and the stop structure can also bear the force that assists the bolt in bearing part of the guide rod and transmits to the guide support, thereby further improving the guiding stability of the guide rod.

[0020] Optionally, one end of the guide rod is provided with a thread. When installing the guide rod, the guide rod is inserted into the corresponding screw hole provided on the bottom wall of the reducer housing and tightened.

[0021] By adopting the above technical solution, the guide rod is threadedly connected to the reducer housing through the above structure, so that the guide rod can be detachably installed on the reducer housing, and the installation is stable and the removal is convenient.

[0022] Optionally, a support plate mounting ring is provided inside the reducer housing, and the support plate is overlapped and bolted to the support plate mounting ring; the guide support is provided with a plurality of movable openings, and the plurality of movable openings are provided corresponding to the bolt mounting locations of the support plate and the support plate mounting ring.

[0023] By adopting the above technical solution, the support plate is overlapped and bolted to the support plate mounting ring to stably mount the support plate on the reducer housing, so as to stably assemble the motor rotor assembly and the motor stator assembly. In addition, the operator can reach in through the multiple movable openings of the guide support to fix the support plate in the reducer housing when the motor rotor assembly reaches the assembly position.

[0024] Optionally, a stop structure is provided at the overlap between the support plate and the support plate mounting ring.

[0025] By adopting the above technical solution, the guide support plate can be radially positioned relative to the support plate mounting ring through the stop structure at the overlap, so as to facilitate the alignment of the screw holes on the support plate and the support plate mounting ring, thereby improving the convenience of supporting plate installation.

[0026] Optionally, a stator mounting ring is provided inside the reducer housing, and the motor stator assembly is overlapped and bolted to the stator mounting ring.

[0027] By adopting the above technical solution, the motor stator assembly is overlapped and bolted to the stator mounting ring, so that the motor stator assembly can be stably mounted on the reducer housing.

[0028] Optionally, a stop structure is provided at the overlap between the motor stator assembly and the stator mounting ring.

[0029] By adopting the above technical solution, the motor stator assembly can be radially positioned relative to the stator mounting ring through the stop structure at the overlap, so as to facilitate the alignment of the screw holes on the motor stator assembly and the stator mounting ring, thereby improving the convenience of installing the motor stator assembly.

[0030] Optionally, a combined bearing is arranged between the support plate and the motor main shaft.

[0031] By adopting the above technical solution, the combined bearing stably guides the rotation of the motor main shaft relative to the support plate, so that the motor rotor can perform reduction transmission more stably.

[0032] In summary, the present invention includes at least one of the following beneficial technical effects:

[0033] 1. The guide rod can ensure that the motor rotor assembly is completely centered during the falling assembly process, reducing the magnetic attraction generated by the non-concentricity of the motor stator and the motor rotor assembly; at the same time, the guide rod can fully withstand the magnetic attraction generated between the motor stator and the motor rotor assembly without deformation, avoiding the damage of the magnetic steel caused by the contact between the motor stator and the rotor due to the magnetic attraction; through the coordination of the reducer housing, the guide rod and the vertical assembly method, the directional guidance of the motor rotor assembly during the assembly process and the effect of withstanding a large magnetic attraction can be achieved, without the need for auxiliary equipment, and the assembly can be completed in one time, and there is no need to purchase a stator-rotor assembly machine separately, which improves the convenience of assembling the rotor and stator of large permanent magnet motors, and greatly reduces the assembly cost;

[0034] 2. The guide support and the reducer housing work together to limit and fix the guide rod, so that the guide rod can more stably withstand the magnetic attraction force, so as to stably center and guide the motor rotor assembly;

[0035] 3. Through the stop structure at the overlap, the guide support can be radially positioned relative to the reducer housing first, so as to align the screw holes on the guide support and the reducer housing, thereby improving the convenience of installing the guide support; and the stop structure can also assist the bolt in bearing part of the force transmitted to the guide support by the guide rod, thereby further improving the guiding stability of the guide rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of a permanent magnet semi-direct drive motor for displaying a large vertical mill in an embodiment of the present invention.

[0037] Figure 2 It is a structural schematic diagram for illustrating a motor rotor assembly in an embodiment of the present invention.

[0038] Explanation of the accompanying drawings: 1. reducer housing; 2. guide support; 3. motor stator assembly; 4. guide rod; 5. motor rotor assembly; 5-1. support plate; 5-2. motor rotor; 5-3. bearing; 5-4. motor main shaft; 5-5. fixing bolt. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-2 The present invention is described in further detail.

[0040] The embodiment of the present invention discloses a method for assembling a large vertical mill permanent magnet semi-direct drive motor. Figure 1 and Figure 2 The assembly method of a large vertical mill permanent magnet semi-direct drive motor includes the following steps:

[0041] 1) Complete the assembly of the motor rotor assembly 5 outside the reducer housing 1:

[0042] The motor rotor assembly 5 includes a motor main shaft 5-4, a support plate 5-1 and a motor rotor 5-2, wherein the support plate 5-1 is sleeved on the motor main shaft 5-4. A combined bearing 5-3 is arranged between the support plate 5-1 and the motor main shaft 5-4, and the combined bearing 5-3 includes at least two rolling bearings 5-3. In the embodiment of the present invention, two rolling bearings 5-3 are arranged, and in other embodiments of the present invention, three, four or more rolling bearings 5-3 may be arranged. The outer rings of the two rolling bearings 5-3 are both fixedly connected to the inner circumference of the support plate 5-1, and the inner rings of the two rolling bearings 5-3 are both fixedly connected to the outer circumference of the motor main shaft 5-4.

[0043] The motor rotor 5-2 is sleeved on the motor main shaft 5-4 and is arranged coaxially with the motor main shaft 5-4. The web of the motor rotor 5-2 extends to the bottom of the motor main shaft 5-4. The web of the motor rotor 5-2 and the lower end surface of the motor main shaft 5-4 are fixedly connected by circumferentially distributed fixing bolts 5-5. The motor rotor 5-2 is located below the support plate 5-1.

[0044] The motor rotor 5-2 and the support plate 5-1 are each provided with at least two through holes. In the embodiment of the present invention, the number of through holes is set to four. In other embodiments of the present invention, the number of through holes can be set to two, three or more. The four through holes of the motor rotor 5-2 and the support plate 5-1 correspond to each other one by one and are arranged on the same central axis.

[0045] 2) Internal settings of reducer housing 1:

[0046] A support plate mounting ring is provided inside the reducer housing 1, and the axis of the support plate mounting ring is parallel to the axis of the reducer housing 1. A stator mounting ring is also provided inside the reducer housing 1, and the axis of the stator mounting ring is parallel to the axis of the reducer housing 1, and the stator mounting plate is located below the support plate mounting ring.

[0047] 3) Install the motor stator assembly 3 inside the reducer housing 1:

[0048] The motor stator assembly 3 is overlapped on the stator mounting ring. A stop structure is provided at the overlap between the motor stator assembly 3 and the stator mounting ring. The stop structure first radially positions the motor stator assembly 3 relative to the stator mounting ring, and then bolts the motor stator assembly 3 to the stator mounting ring.

[0049] 4) Install the guide rod 4 inside the reducer housing 1:

[0050] The number of guide rods 4 corresponds to the number of through holes on the support plate 5-1. In the embodiment of the present invention, the number of guide rods 4 is four. In other embodiments of the present invention, the number of guide rods 4 can be set to two, three or more corresponding to the number of through holes on the support plate 5-1.

[0051] Four screw holes are correspondingly opened on the bottom wall of the reducer housing 1. When installing the guide rods 4, the four guide rods 4 are correspondingly inserted into the screw holes opened on the bottom wall of the reducer housing 1 and tightened. The four guide rods 4 are parallel to the axis of the motor stator assembly 3 and are located in the hollow of the motor stator assembly 3.

[0052] 5) Set the guide support 2:

[0053] The guide support 2 is sleeved on the motor main shaft 5-4 and placed on the support plate 5-1. The guide support 2 is provided with a plurality of movable openings, which are arranged at intervals around the central axis of the guide support 2.

[0054] At least two plugging holes are formed on the lower side wall of the guide support 2. The number of the plugging holes corresponds to the number of the guide rods 4. In the embodiment of the present invention, the number of the plugging holes is four.

[0055] 6) Perform preliminary assembly and install guide support 2:

[0056] A lifting ring is fixed on the upper end surface of the motor main shaft 5-4, and the motor rotor assembly 5 and the guide support 2 are lifted to the opening of the reducer housing 1 by a lifting device. The operator adjusts the motor rotor assembly 5 so that the four guide rods 4 are aligned with the corresponding through holes on the motor rotor 5-2 and the support plate 5-1, and then lifts it downward along the guide rods 4 for sliding assembly.

[0057] When the guide rods 4 are inserted into the insertion holes one by one during the downward sliding process, the guide support 2 just overlaps the reducer housing 1, and a stop structure is provided at the overlap of the guide support 2 and the reducer housing 1. The stop structure first radially positions the guide support 2 relative to the reducer housing 1, and then bolts the guide support 2 to the reducer housing 1.

[0058] 7) Perform final assembly:

[0059] After installing the guide support 2, continue to slide the motor rotor assembly 5 downward along the guide rod 4 until the support plate 5-1 overlaps the support plate mounting ring, indicating that the motor rotor 5-2 has reached the assembly position with the motor stator assembly 3. A stopper structure is provided at the overlap of the support plate 5-1 and the support plate mounting ring, and the stopper structure first radially positions the support plate 5-1 relative to the support plate mounting ring, and the operator then reaches in through the multiple movable openings provided on the guide support 2 to bolt the support plate 5-1 to the support plate mounting ring.

[0060] Finally, the guide support 2 and the guide rod 4 are removed relative to the reducer housing 1, and the assembly of the motor rotor 5-2 and the motor stator assembly 3 is completed.

[0061] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for assembling a large vertical mill permanent magnet semi-direct drive motor, characterized in that: The following steps are involved: The motor rotor assembly (5) is assembled outside the reducer housing (1), the support plate (5-1) is sleeved and rotatably connected to the middle of the motor main shaft (5-4), and the motor rotor (5-2) is fixedly installed on the lower end surface of the motor main shaft (5-4), the motor rotor (5-2) and the support plate (5-1) are each provided with at least two through holes, and the through holes of the motor rotor (5-2) and the support plate (5-1) correspond to each other one by one and are arranged on the same central axis; A motor stator assembly (3) and guide rods (4) having the same number as the through holes on the support plate (5-1) are installed inside the reducer housing (1), and the guide rods (4) are parallel to the axis of the motor stator assembly (3); The motor main shaft (5-4) is moved to the opening of the speed reducer housing (1), and after the guide rod (4) is aligned with the through holes on the motor rotor (5-2) and the support plate (5-1), the motor is slid downwardly along the guide rod (4) until the motor rotor (5-2) reaches the assembly position with the motor stator assembly (3), and then the support plate (5-1) is fixedly installed on the speed reducer housing (1), and finally the guide rod (4) is removed to complete the assembly of the motor rotor (5-2) and the motor stator assembly (3).

2. The assembly method of a large vertical mill permanent magnet semi-direct drive motor according to claim 1, characterized in that: A guide support (2) is sleeved on the motor main shaft (5-4), and the guide support (2) is placed on the support plate (5-1), and then the motor main shaft (5-4) is moved to the opening of the reducer housing (1) and assembled downward; The lower side wall of the guide support (2) is provided with at least two plug-in holes, the number of which corresponds to the number of guide rods (4). When the guide rods (4) are inserted into the plug-in holes one by one during the downward assembly process, the guide support (2) is detachably mounted on the reducer housing (1), and then the motor spindle (5-4) housing is further assembled downward.

3. The assembly method of a large vertical mill permanent magnet semi-direct drive motor according to claim 2 is characterized in that: When the guide rods (4) are inserted into the insertion holes in a one-to-one correspondence, the guide support (2) overlaps the reducer housing (1), and at this time, the guide support (2) is bolted to the reducer housing (1).

4. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to claim 3, characterized in that: A stop structure is provided at the overlap between the guide support (2) and the reducer housing (1).

5. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to any one of claims 1 to 4, characterized in that: One end of the guide rod (4) is provided with a thread. When installing the guide rod (4), the guide rod (4) is correspondingly inserted into a screw hole provided on the bottom wall of the reducer housing (1) and then tightened.

6. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to any one of claims 2 to 4, characterized in that: A support plate mounting ring is arranged inside the reducer housing (1), and the support plate (5-1) is overlapped and bolted to the support plate mounting ring; the guide support (2) is provided with a plurality of movable openings, and the plurality of movable openings are arranged corresponding to the bolt mounting positions of the support plate (5-1) and the support plate mounting ring.

7. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to claim 6, characterized in that: A stop structure is provided at the overlap between the support plate (5-1) and the support plate mounting ring.

8. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to any one of claims 1 to 4, characterized in that: A stator mounting ring is arranged inside the reducer housing (1), and the motor stator assembly (3) is overlapped and bolted to the stator mounting ring.

9. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to claim 8, characterized in that: A stop structure is provided at the overlap between the motor stator assembly (3) and the stator mounting ring.

10. The method for assembling a large vertical mill permanent magnet semi-direct drive motor according to claim 1, characterized in that: A combined bearing (5-3) is arranged between the support plate (5-1) and the motor main shaft (5-4).

Images