Large permanent magnet motor stator and rotor combination device

Abstract

The invention belongs to the technical field of motor assembly, and particularly relates to a large permanent magnet motor stator and rotor assembling device which comprises a base plate, an annular platform plate is installed on the base plate through a first supporting plate, and a stator is placed on the platform plate; a positioning cylinder is installed on the base plate, and a guide shaft is installed in the positioning cylinder in an inserted mode. A positioning frame is arranged in the stator and is arranged on the guide shaft in a sliding manner; the positioning frame gradually moves from the upper end to the lower end in the stator along with the downward assembly of the rotor into the stator, and a magnet vane is mounted on the outer side of the rotor; the device is simple in structure, the lower end and the upper end of the guide shaft can be positioned and fixed together, the phenomenon that the lower end and the upper end of the guide shaft attract each other during assembly is avoided, the uniformity of a circumferential air gap when a rotor enters a stator is affected, the influence of unilateral magnetic force on the assembly process is avoided or reduced, and it is guaranteed that assembly is conducted smoothly and the assembly quality is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor assembly, in particular to a large permanent magnet motor stator and rotor combined assembly device. BACKGROUND

[0002] During the assembly of the permanent magnet motor, it is crucial to ensure that the stator and rotor do not attract each other during the assembly process. However, due to the large mass and large amount of magnetic steel used in large permanent magnet motors, the rotor may still attract the stator when it first enters the stator, making it difficult to control the uniformity, levelness, and perpendicularity of the air gap when the rotor first enters the stator, resulting in uneven air gaps during the combined assembly and large single-sided magnetic pull.

[0003] It is a great challenge to control the single-sided magnetic pull during the assembly process to a minimum and ensure the quality of the bearings during the assembly process. In terms of assembly technology, the current methods used are vertical assembly and horizontal assembly. However, horizontal assembly involves a large device and needs to overcome the influence of the rotor's own weight on the uniformity of the air gap and the quality of the bearing assembly. The difficulty of vertical assembly lies in the control of the uniformity, levelness, and perpendicularity of the air gap when the rotor first enters the stator. SUMMARY

[0004] To make up for the shortcomings of the prior art, the lower end and the upper end of the guide shaft are positioned and fixed together to avoid the phenomenon of mutual attraction during the combined assembly, which affects the uniformity of the circumferential air gap when the rotor enters the stator, avoids or reduces the influence of single-sided magnetic force on the combined assembly process, ensures the smooth progress of the combined assembly, and ensures good quality of the combined assembly. The present application proposes a large permanent magnet motor stator and rotor combined assembly device.

[0005] The technical solution adopted by the present application to solve its technical problems is as follows: the large permanent magnet motor stator and rotor combined assembly device of the present application comprises a base plate, the base plate is installed with a circular ring-shaped platform plate through a support plate, and the platform plate is placed with a stator; A stop ring is installed on the platform plate and is tightly fixed through a fixed plate, and the stop ring is located outside the stator; A positioning cylinder is installed on the base plate, a guide shaft is inserted and installed in the positioning cylinder, the guide shaft passes out from the middle of the stator, and the rotor is assembled into the stator from top to bottom along the guide shaft; A positioning frame is arranged in the stator, the positioning frame comprises a sleeve ring, the sleeve ring is slidingly installed on the guide shaft, a plurality of evenly distributed ejector rods are installed on the outer side of the sleeve ring, the other end of each ejector rod is fixedly installed with a contact arc plate, and the contact arc plates abut against the inner wall of the stator; The positioning frame gradually moves from the upper end to the lower end in the stator as the rotor is combined and assembled into the stator, upper and lower baffles are installed at both ends of the rotor, a lifting ring is installed on the upper baffle, and a magnetic separation plate is installed on the outer side of the rotor.

[0006] Preferably, an installation groove is arranged on the inner wall of the positioning cylinder, and a plurality of groups of hydraulic bags are installed in the installation groove, the hydraulic bags are uniformly distributed along the circumferential direction of the installation groove, the hydraulic bags are in communication with each other, and the hydraulic bags are connected to a hydraulic pump station in the outside world. The inner diameter of the positioning cylinder is greater than the diameter of the guide shaft, an inclined surface is arranged at the inlet of the positioning cylinder, and an isolation layer is installed on the inclined surface, the isolation layer being made of polytetrafluoroethylene material.

[0007] Preferably, the inner diameter of the hydraulic bag before expansion is greater than the inner diameter of the positioning cylinder, and the edges of the installation groove on the upper and lower sides are inverted to form inclined surfaces. The positioning cylinder is fixedly installed on the base plate through the support plate II, and a gap exists between the lower end of the positioning cylinder and the base plate, and the lower end surface of the guide shaft contacts the surface of the base plate.

[0008] Preferably, the positioning frame includes two groups of upper and lower positioning frames, a sliding rod is slidingly installed on the positioning frame, and the sliding rod penetrates through the two groups of upper and lower sleeve rings. The two groups of upper and lower positioning frames are distributed in a staggered manner.

[0009] Preferably, an abutting rod is installed on the positioning frame, an elastic layer is installed on the upper end of the abutting rod, the abutting rod is a telescopic rod, and the upper end of the abutting rod contacts the lower baffle on the rotor.

[0010] Preferably, the sleeve ring, the contact arc plate and the abutting rod are made of non-magnetic conductive material.

[0011] Preferably, a plurality of split magnetic shielding plates are installed on the outer circumferential surface of the rotor, the magnetic shielding plates are in inverted L shape, the magnetic shielding plates include a plate body and a fixing block, the fixing block is installed on the lower baffle through bolts, and the edge of the fixing block is inverted at an angle. The length of the plate body is greater than or equal to the height of the rotor, and the end of the plate body away from the fixing block is close to the upper end of the rotor.

[0012] Preferably, a communication groove is arranged in the end of the plate body away from the fixing block, a limiting ring is installed in the communication groove, and the limiting ring extrudes the plate body to be tightly attached to the outer circumferential surface of the rotor.

[0013] The beneficial effects of the present application are as follows: 1. The large permanent magnet motor stator and rotor assembling device, through the setting of the positioning frame, the sleeve ring, the ejection rod, the contact arc plate and the positioning cylinder, the lower end and the upper end of the guide shaft are positioned and fixed at the same time, the center line of the guide shaft and the axis of the stator coincide during assembling, the upper end of the guide shaft is slightly skewed and deviated after being affected by the single magnetic force, the phenomenon that the rotor and the stator are adsorbed to each other when the rotor enters the stator is avoided, and the uniformity of the circumferential air gap when the rotor enters the stator is affected.

[0014] 2. The large permanent magnet motor stator and rotor assembling device, through the setting of the positioning cylinder, the hydraulic bag and the inclined surface, the inner diameter of the positioning cylinder is larger than the diameter of the guide shaft, the gap between the positioning cylinder and the guide shaft is avoided to be too small, the difficulty of inserting the guide shaft into the positioning cylinder is increased, and the surface friction of the two is damaged, at the same time, the inner wall of the hydraulic bag does not contact each other when the guide shaft is inserted, the hydraulic bag is avoided to be damaged by scratching and friction when the guide shaft is inserted. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described below in combination with the drawings.

[0016] Figure 1 is the perspective view of the assembling device of the application; Figure 2 is the structural schematic view of the assembling device of the application; Figure 3 is the structural schematic view of the assembling device of the application when the stator and the rotor are assembled; Figure 4 is the structural schematic view of the magnetic separation plate in the assembling device of the application; Figure 5 is the structural schematic view of the positioning frame in the assembling device of the application; Figure 6 is Figure 3 is the local enlarged view of A in the figure; Figure 7 is Figure 3 is the local enlarged view of B in the figure; Figure 8 is Figure 3 is the local enlarged view of C in the figure; Figure 9 is Figure 3 is the local enlarged view of D in the figure; Figure 10 is Figure 4 is the local enlarged view of E in the figure; In the diagram: Base plate 1, Support plate 11, Platform plate 12, Fixing plate 13, Stop ring 14, Positioning cylinder 2, Support plate 21, Hydraulic bladder 22, Beveled surface 23, Isolation layer 24, Stator 3, Rotor 4, Upper baffle 41, Lower baffle 42, Magnetic shielding plate 5, Fixing block 51, Limiting ring 52, Positioning frame 6, Collar 61, Abutting rod 62, Ejecting rod 63, Contact arc plate 64, Sliding rod 65, Guide shaft 7. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] like Figures 1 to 10 As shown, the present invention provides a large permanent magnet motor stator and rotor assembly device, including a base plate 1, on which a circular platform plate 12 is mounted via a support plate 11, and a stator 3 is placed on the platform plate 12. A stop ring 14 is installed on the platform plate 12. The stop ring 14 is pressed and fixed by the fixing plate 13. The stop ring 14 is located on the outside of the stator 3. A positioning cylinder 2 is installed on the base plate 1, and a guide shaft 7 is inserted into the positioning cylinder 2. The guide shaft 7 passes through the middle of the stator 3, and the rotor 4 is installed into the stator 3 from top to bottom along the guide shaft 7. The stator 3 is provided with a positioning frame 6, which includes a collar 61. The collar 61 is slidably mounted on the guide shaft 7. The outer side of the collar 61 is provided with evenly distributed ejector rods 63. The other end of the ejector rods 63 is fixedly mounted with a contact arc plate 64, which abuts against the inner wall of the stator 3. As the rotor 4 is assembled into the stator 3, the positioning frame 6 gradually moves from the upper end to the lower end of the stator 3. The rotor 4 is equipped with an upper baffle 41 and a lower baffle 42 at both ends. A lifting ring is installed on the upper baffle 41. A magnetic shielding plate 5 is installed on the outside of the rotor 4. During operation, the worker places the stator 3 in the middle of the stop ring 14 on the platform plate 12. Then, the worker passes the guide shaft 7 through the stator 3 and inserts the lower end of the guide shaft 7 into the positioning cylinder 2 to complete the positioning and fixing of the stator 3 and the guide shaft 7, so as to avoid displacement and offset of the stator 3 and the guide shaft 7 during the assembly process, which would affect the smooth progress of the assembly. Afterwards, the staff installed the magnetic shielding plate 5 on the outer circumference of the rotor 4 to prevent the rotor 4 from attracting each other when it first entered the stator 3 during assembly. Afterwards, the staff installs the positioning frame 6 to the guide shaft 7, so that the positioning frame 6 is located at the upper end close to the stator 3, then the staff controls the ejection rod 63 to act, so that the ejection rod 63 drives the contact arc plate 64 to extend, so that the contact arc plate 64 abuts on the inner wall of the stator 3, and the position of the positioning frame 6 in the stator 3 is positioned and fixed, and it is ensured that the end of the guide shaft 7 away from the positioning cylinder 2 is also positioned accurately, avoiding shaking or deviation during assembly, causing the rotor 4 to interfere with the stator 3, causing damage; Afterwards, the staff hoists up the rotor 4 through the lifting ring on the rotor 4, and inserts the guide shaft 7 into the rotor 4, so that the rotor 4 moves downward along the guide shaft 7 under the action of its own gravity, so that the rotor 4 gradually enters the stator 3, realizing the assembly of the stator and the rotor 4, and at the same time, when the rotor 4 approaches the positioning frame 6, the hoisted rotor 4 is temporarily stopped from descending, at this time, the staff controls the ejection rod 63 to retract, releasing the contact between the contact arc plate 64 and the inner wall of the stator 3, so that the sleeve ring 61 on the positioning frame 6 can move downward along the guide shaft 7 for a distance, so that the positioning frame 6 and the rotor 4 are re-spaced, then the ejection rod 63 is controlled to extend again, and the positioning frame 6 is positioned and fixed again, then the hoisted rotor 4 is controlled to continue to descend, and the process is repeated until the assembly of the stator and the rotor 4 is completed; At the same time, by installing the upper baffle 41 and the lower baffle 42 on both ends of the rotor 4, the end faces of the rotor 4 are protected, avoiding contact or collision between the end faces of the rotor 4 and the stator 3 and other equipment during assembly, which may cause damage to the rotor 4, and at the same time, the installation of the lifting ring on the rotor 4 and the hoisting of the rotor 4 are facilitated by the upper baffle 41 and the lower baffle 42; At the same time, since the stop ring 14 on the platform plate 12 is tightly fixed by the fixed plate 13, when assembling different models of motor stators and rotors 4, the staff selects a stop ring 14 with a diameter suitable for the diameter of the motor stator 3 to be assembled, installs the stop ring 14 on the platform plate 12, so that the stop ring 14 and the platform plate 12 form a stepped shape, then places the motor stator 3 in the middle of the stop ring 14, positions and fixes the stator 3, so that the assembly device can adapt to the assembly of different motor stators and rotors 4, and the application range of the assembly device is expanded; Meanwhile, the lower end of the guide shaft 7 is inserted into the positioning cylinder 2 to position and fix the lower end of the guide shaft 7, the positioning frame 6 mounted on the guide shaft 7 positions and fixes the upper end of the guide shaft 7 close to the upper end of the stator 3, and the positioning and fixing of the stator 3 on the platform plate 12 cooperate to sufficiently position and fix the upper and lower ends of the guide shaft 7, so that the upper end of the guide shaft 7 is not slightly skewed and deviated due to the elastic deformation of the guide shaft 7 or the gap between the guide shaft 7 and the positioning cylinder 2 or the local wear of the positioning cylinder 2 when the lower end of the guide shaft 7 is fixed, and the interference between the rotor 4 and the stator 3 is caused, so that the rotor 4 and the stator 3 are damaged and the safety of the assembly is affected; Meanwhile, the ejection rod 63 is a hydraulic rod or an electric telescopic rod, the side surface of the contact arc plate 64 facing the inner wall of the stator 3 is provided with an elastic layer to avoid damage to the inner wall of the stator 3 caused by the abutment between the contact arc plate 64 and the inner wall of the stator 3, and the magnetic attraction between the stator 3 and the rotor 4 is reduced by mounting the magnetic separation plate 5 on the outer side of the rotor 4 to isolate the stator 3 and the rotor 4 from each other, so that the mutual adsorption between the stator 3 and the rotor 4 is avoided when the rotor 4 enters the stator 3, the circumferential air gap is uniform when the rotor 4 enters the stator 3, and the influence of the radial one-sided magnetic attraction between the rotor 4 and the stator 3 due to the axis deviation on the assembly process is reduced.

[0019] As an embodiment of the present application, the inner wall of the positioning cylinder 2 is provided with a mounting groove, a plurality of hydraulic capsules 22 are mounted in the mounting groove, the hydraulic capsules 22 are uniformly distributed along the circumferential direction of the mounting groove, the hydraulic capsules 22 are connected to each other, and the hydraulic capsules 22 are connected to the hydraulic pump station outside; The inner diameter of the positioning cylinder 2 is greater than the diameter of the guide shaft 7, a bevel is formed at the inlet of the positioning cylinder 2, and a separation layer 24 made of polytetrafluoroethylene is mounted on the bevel; Since the inner diameter of the positioning cylinder 2 is greater than the diameter of the guide shaft 7, the assembly gap between the two is relatively large, so that the process of inserting the lower end of the guide shaft 7 into the positioning cylinder 2 is facilitated, the assembly gap between the two is not too small, the difficulty of inserting the guide shaft 7 into the positioning cylinder 2 is reduced, and the interference and friction between the guide shaft 7 and the positioning cylinder 2 during the insertion process is avoided, so that the surface of the guide shaft 7 is not damaged and the positioning cylinder 2 is not worn; Meanwhile, the bevel is arranged at the opening of the positioning cylinder 2 to guide the guide shaft 7 during the process of inserting the guide shaft 7 into the positioning cylinder 2, so that the guide shaft 7 is conveniently inserted into the positioning cylinder 2, and the separation layer 24 made of polytetrafluoroethylene is mounted on the bevel to reduce the friction between the guide shaft 7 and the positioning cylinder 2 and avoid damage caused by the friction between the two; Meanwhile, after the guide shaft 7 is inserted into the positioning cylinder 2, the staff controls the hydraulic pump station outside to fill the hydraulic oil into the hydraulic bag 22, so that the hydraulic bag 22 starts to expand, thereby positioning and fixing the guide shaft 7, ensuring the position accuracy of the guide shaft 7 in the positioning cylinder 2, avoiding the center line of the guide shaft 7 from deviating from the axis, meanwhile, by arranging multiple groups of hydraulic bags 22 and the mutual communication between the hydraulic bags 22, the force of each hydraulic bag 22 on the guide shaft 7 is the same, so that the guide shaft 7 is located at the middle position in the positioning cylinder 2, improving the positioning accuracy of the guide shaft 7, and further ensuring the position accuracy of the guide shaft 7 and improving the quality and effect of the assembly of the rotor 4 and the guide shaft 7.

[0020] As an embodiment of the application, the inner diameter of the hydraulic bag 22 before expansion is greater than the inner diameter of the positioning cylinder 2, and the edges of the installation groove on the upper and lower sides are inclined to form an inclined surface 23; The positioning cylinder 2 is fixedly installed on the base plate 1 through the support plate two 21, and there is a gap between the lower end of the positioning cylinder 2 and the base plate 1, and the lower end surface of the guide shaft 7 contacts the surface of the base plate 1; Since the inner diameter of the hydraulic bag 22 before expansion is greater than the inner diameter of the positioning cylinder 2, there is a gap between the outer wall of the guide shaft 7 and the side surface of the hydraulic bag 22 during the insertion of the guide shaft 7 into the positioning cylinder 2, and no contact occurs between the two, thereby avoiding the contact or scratching between the guide shaft 7 and the hydraulic bag 22 during the downward insertion of the guide shaft 7 into the positioning cylinder 2, which causes the surface of the hydraulic bag 22 to be damaged or broken, affecting the normal use of the hydraulic bag 22 and the subsequent positioning and fixing effect of the hydraulic bag 22 on the guide shaft 7; Meanwhile, since the edges of the installation groove on the upper and lower sides are inclined, the edges of the installation groove become inclined surfaces, which facilitates the smooth passage of the guide shaft 7 through the area where the installation groove is located during the downward insertion of the guide shaft 7 into the positioning cylinder 2, avoids the relatively large assembly gap between the guide shaft 7 and the positioning cylinder 2, the deviation of the center line of the guide shaft 7 from the axis of the positioning cylinder 2 when the guide shaft 7 moves downward, the interference or abutment between the lower end of the guide shaft 7 and the side wall of the installation groove, and affects the insertion of the guide shaft 7 or causes the edge of the end surface of the guide shaft 7 to be damaged; Meanwhile, since the lower end of the positioning cylinder 2 is installed on the base plate 1 through the support plate two 21, and there is a gap between the positioning cylinder 2 and the base plate 1, the impurities and debris falling into the positioning cylinder 2 during the use of the assembling device can be conveniently cleaned through the gap between the positioning cylinder 2 and the base plate 1. Meanwhile, since there is a gap between the positioning cylinder 2 and the base plate 1, when the guide shaft 7 is inserted into the positioning cylinder 2, the staff can intuitively see the placement of the guide shaft 7, thereby facilitating the staff to judge the positioning and fixing effect of the guide shaft 7, and improving the effect and quality of the assembling.

[0021] As an embodiment of the present application, the positioning frame 6 comprises two groups of upper and lower positioning frames, a sliding rod 65 is slidably installed on the positioning frame 6, and the sliding rod 65 penetrates the two groups of upper and lower positioning frames; The two groups of upper and lower positioning frames 6 are distributed in a staggered manner; Since the positioning frame 6 comprises two groups of upper and lower positioning frames, and the two groups of positioning frames 6 are connected through the sliding rod 65, during the assembling of the stator 3 and the rotor 4, when the rotor 4 approaches the positioning frame 6, the staff controls the ejection rod 63 on the lower positioning frame 6 to retract, so that the lower positioning frame 6 is released from the fixing in the stator 3, and the lower positioning frame 6 can slide downward along the sliding rod 65 under the action of gravity, that is, the distance between the two groups of positioning frames 6 is pulled apart, then the lower positioning frame 6 is fixed in the stator 3 again, and the upper positioning frame 6 is released from the fixing, so that the upper positioning frame 6 recontacts and abuts against the lower positioning frame 6 under the action of gravity, then the upper positioning frame 6 is fixed in the stator 3 again, so that the distance between the rotor 4 and the positioning frame 6 is pulled apart again, and the rotor 4 can continue to be assembled downward into the stator 3. During this process, the upper end of the guide shaft 7 is always positioned and fixed by the positioning frame 6 through the cooperation between the two groups of upper and lower positioning frames 6, so that the guide shaft 7 is not deviated by the influence of the unilateral magnetic force when the positioning frame 6 is adjusted downward, the rotor 4 and the stator 3 are not interfered with, and the safety and effect of the assembling are improved. Meanwhile, since the two groups of upper and lower positioning frames 6 are distributed in a staggered manner, the ejection rod 63 and the contact arc plate 64 on the two groups of positioning frames 6 are also relatively staggered, so that the positioning of the two groups of positioning frames 6 in the stator 3 is more accurate, the positioning and fixing effect of the guide shaft 7 is improved, and the contact or collision between the rotor 4 and the stator 3 during the assembling is avoided.

[0022] As an embodiment of the present application, the positioning frame 6 is installed with an abutting rod 62, the upper end of the abutting rod 62 is installed with an elastic layer, the abutting rod 62 is a telescopic rod, and the upper end of the abutting rod 62 contacts with the lower baffle 42 on the rotor 4; By installing the abutment rod 62 on the positioning frame 6, the abutment rod 62 and the lower end face of the rotor 4 are in contact and bear each other, thus preventing the rotor 4 from directly contacting the positioning frame 6 and causing damage to the surface of the rotor 4. At the same time, the mutual contact between the abutment rod 62 and the lower end face of the rotor 4 can also prevent the rotor 4 from rotating relative to each other during the assembly process, which would affect the smooth progress and safety of the assembly.

[0023] In one embodiment of the present invention, the collar 61, the contact arc plate 64, and the abutment rod 62 are made of non-magnetic materials; The non-magnetic collar 61, contact arc plate 64, and abutment rod 62 are used to prevent the positioning frame 6 from being affected by the permanent magnet on the rotor 4. This allows the positioning frame 6 to move smoothly downwards by its own gravity when it descends inside the stator 3, preventing the magnetic force of the permanent magnet on the rotor 4 from attracting or pulling the positioning frame 6, which would prevent the positioning frame 6 from moving downwards inside the stator 3 and thus affect the smooth progress of the assembly process.

[0024] As one embodiment of the present invention, a plurality of separate magnetic shielding plates 5 are installed on the outer circumferential surface of the rotor 4. The magnetic shielding plates 5 are in the shape of an inverted L. The magnetic shielding plate 5 includes a plate body and a fixing block 51. The fixing block 51 is installed on the lower baffle 42 by bolts. The edge of the fixing block 51 near the stator 3 is chamfered. The length of the plate is greater than or equal to the height of the rotor 4, and the end of the plate away from the fixing block 51 is close to the upper end of the rotor 4. Since the length of the plate is greater than or equal to the height of the rotor 4, and the magnetic shielding plate 5 is fixed by the fixing block 51 at the lower end, the magnetic shielding plate 5 can completely shield the outer circumference of the rotor 4. In addition, during the assembly of the rotor 4, the magnetic shielding plate 5 will not have any end or edge located inside the stator 3 except for the lower end face. This avoids the situation where, during the assembly process, due to the relatively small air gap between the stator and rotor 4 and the presence of a joint between the magnetic shielding plates 5 in the middle, the joint in the middle of the magnetic shielding plate 5 is not subjected to contact or scraping by the inner wall of the stator 3, causing the magnetic shielding plate 5 to lift up or get stuck between the stator and rotor 4, thus affecting the assembly process of the rotor 4. Meanwhile, due to the chamfered edge of the fixing block 51 on the magnetic shielding plate 5 and the fact that the fixing block 51 is located at the lower end of the magnetic shielding plate 5, the chamfer on the fixing block 51 guides and directs the rotor 4 when it enters the stator 3 during the assembly process. Furthermore, the fixing of the lower end of the magnetic shielding plate 5 ensures that the magnetic shielding plate 5 can smoothly enter the stator 3 along with the rotor 4, preventing the other end of the magnetic shielding plate 5 from tilting up and affecting the assembly process.

[0025] In one embodiment of the present invention, a connecting groove is provided at the end of the plate away from the fixing block 51, and a limiting ring 52 is installed in the connecting groove. The limiting ring 52 presses the plate tightly against the outer circumferential surface of the rotor 4. By opening a connecting groove at the upper end of the magnetic shielding plate 5 and installing a limiting ring 52 in the connecting groove, the upper end of the magnetic shielding plate 5 is positioned so that the upper part of the magnetic shielding plate 5 can be tightly attached to the surface of the rotor 4. This prevents the upper end of the magnetic shielding plate 5 from tilting up or deforming after being hit, which would affect the isolation effect of the magnetic shielding plate 5 on the magnetic attraction between the stator and rotor 4. It also prevents the upper end of the magnetic shielding plate 5 from tilting up and scraping against the inner wall of the stator 3 during the assembly process, which would affect the assembly. Furthermore, the positioning and fixing by the limiting ring 52 reduces the number of bolts used for fixing the magnetic shielding plate 5, making it easier to install and remove the magnetic shielding plate 5. After the assembly is completed, after removing the bolts on the fixing block 51, the magnetic shielding plate 5 can be pulled downwards from between the stator and rotor 4.

[0026] The specific workflow is as follows: During operation, the worker places the stator 3 in the middle of the stop ring 14 on the platform plate 12. Then, the worker passes the guide shaft 7 through the stator 3 and inserts the lower end of the guide shaft 7 into the positioning cylinder 2. Afterwards, the staff installed the magnetic shielding plate 5 onto the outer circumference of the rotor 4; Afterwards, the staff installed the positioning frame 6 onto the guide shaft 7, so that the positioning frame 6 was located near the upper end of the stator 3. Then, the staff controlled the ejector rod 63 to move, so that the ejector rod 63 drove the contact arc plate 64 to extend, so that the contact arc plate 64 abutted against the inner wall of the stator 3, thereby positioning and fixing the position of the positioning frame 6 inside the stator 3. Afterwards, the workers hoisted the rotor 4 using the lifting rings on the rotor 4 and inserted the guide shaft 7 into the rotor 4. Under its own weight, the rotor 4 moved downwards along the guide shaft 7 and gradually entered the stator 3. At the same time, when the rotor 4 approached the positioning frame 6, the hoisted rotor 4 was temporarily stopped from descending. At this time, the workers controlled the ejector rod 63 to retract, releasing the contact arc plate 64 from the inner wall of the stator 3. This allowed the collar 61 on the positioning frame 6 to move downwards along the guide shaft 7 a certain distance, thus widening the distance between the positioning frame 6 and the rotor 4. Then, the ejector rod 63 was extended again to reposition and fix the positioning frame 6. Afterwards, the hoisted rotor 4 continued to descend, and the process was repeated until the stator and rotor 4 were fully assembled. Meanwhile, by installing upper baffles 41 and lower baffles 42 at both ends of the rotor 4, the end faces of both ends of the rotor 4 are protected, and it is also convenient to install lifting rings on the rotor 4 for hoisting. Meanwhile, when assembling different models of motor stators and rotors 4, the staff selects a stop ring 14 with a suitable diameter according to the diameter of the motor stator 3 to be assembled, and then installs the stop ring 14 onto the platform plate 12 so that the stop ring 14 and the platform plate 12 form a stepped shape. Then, the motor stator 3 is placed in the middle of the stop ring 14 to position and fix the stator 3. Meanwhile, since the lower end of the guide shaft 7 is inserted into the positioning cylinder 2, the lower end of the guide shaft 7 is positioned and fixed. The positioning frame 6 installed on the guide shaft 7 positions and fixes the part of the guide shaft 7 near the upper end of the stator 3, that is, the upper end of the guide shaft 7. Together with the positioning and fixing of the stator 3 on the platform plate 12, both the upper and lower ends of the guide shaft 7 are fully positioned and fixed. This avoids the situation where only the lower end of the guide shaft 7 is fixed, and the upper end of the guide shaft 7 is slightly skewed or offset due to its own elastic deformation, the gap between the guide shaft 7 and the positioning cylinder 2, or the local wear of the positioning cylinder 2. This would prevent interference between the rotor 4 and the stator 3 caused by the unilateral magnetic pull when the rotor 4 is assembled. Meanwhile, the ejector rod 63 is a hydraulic rod or an electric telescopic rod, and an elastic layer is installed on the side of the contact arc plate 64 facing the inner wall of the stator 3. At the same time, a magnetic shielding plate 5 is installed on the outside of the rotor 4. Since the inner diameter of the positioning cylinder 2 is larger than the diameter of the guide shaft 7, the assembly gap between the two is relatively large, which facilitates the process of inserting the lower end of the guide shaft 7 into the positioning cylinder 2. Meanwhile, an inclined surface is provided at the opening of the positioning cylinder 2. The inclined surface is used to guide and direct the guide shaft 7 during the insertion of the positioning cylinder 2. At the same time, a polytetrafluoroethylene isolation layer 24 is installed on the inclined surface to reduce the friction between the guide shaft 7 and the positioning cylinder 2. Meanwhile, after the guide shaft 7 is inserted into the positioning cylinder 2, the staff controls the external hydraulic pump station to fill the hydraulic bladder 22 with hydraulic oil, so that the hydraulic bladder 22 begins to expand, positioning and fixing the guide shaft 7. At the same time, by setting up multiple sets of hydraulic bladders 22 and connecting them with each other, the force exerted by each hydraulic bladder 22 on the guide shaft 7 is the same, so that the guide shaft 7 is located in the middle position inside the positioning cylinder 2. Because the inner diameter of the hydraulic bladder 22 before expansion is larger than the inner diameter of the positioning cylinder 2, there is a gap between the outer wall of the guide shaft 7 and the side of the hydraulic bladder 22 during the process of inserting the guide shaft 7 into the positioning cylinder 2. The two will not come into contact, thus avoiding contact or scraping between the guide shaft 7 and the hydraulic bladder 22 during the process of inserting the guide shaft 7 downward into the positioning cylinder 2, which would cause damage to the surface of the hydraulic bladder 22. Meanwhile, since the edges of the upper and lower sides of the mounting groove are beveled, the edges of the mounting groove become inclined surfaces, which makes it easier for the guide shaft 7 to pass smoothly through the area where the mounting groove is located during the process of inserting the guide shaft 7 downward into the positioning cylinder 2, and avoids interference or contact between the lower end of the guide shaft 7 and the side wall of the mounting groove. Meanwhile, since the lower end of the positioning cylinder 2 is mounted on the base plate 1 through the support plate 21, and there is a gap between the positioning cylinder 2 and the base plate 1, the impurities and debris that fall into the positioning cylinder 2 during the use of the assembly device can be easily cleaned through the gap between the positioning cylinder 2 and the base plate 1. During the assembly of the stator and rotor 4, when the rotor 4 approaches the positioning frame 6, the operator controls the ejector rod 63 on the lower positioning frame 6 to retract, thereby releasing the lower positioning frame 6 from its fixation within the stator 3. This allows the lower positioning frame 6 to slide downwards along the sliding rod 65 under gravity, creating a distance between the two sets of positioning frames 6. Afterwards, the lower positioning frame 6 is re-fixed within the stator 3, and the upper positioning frame 6 is released from its fixation, allowing the upper positioning frame 6 to re-contact and adhere to the lower positioning frame 6 under gravity. Then, the upper positioning frame 6 is fixed within the stator 3, thereby creating a distance between the rotor 4 and the positioning frame 6 again, facilitating the rotor 4 to continue its downward assembly into the stator 3. This ensures that the upper end of the guide shaft 7 is always positioned and fixed by the positioning frame 6. Meanwhile, due to the staggered distribution between the upper and lower sets of positioning frames 6, the ejector rods 63 and contact arc plates 64 on the upper and lower sets of positioning frames 6 are also relatively staggered, making the positioning of the two sets of positioning frames 6 in the stator 3 more accurate. By installing the abutment rod 62 on the positioning frame 6, the abutment rod 62 and the lower end face of the rotor 4 are in contact and bear each other, thus preventing the rotor 4 from directly contacting the positioning frame 6 and preventing the rotor 4 from rotating relative to each other during assembly. The positioning frame 6 is protected from the influence of the permanent magnet on the rotor 4 by the collar 61, contact arc plate 64 and abutment rod 62 made of non-magnetic material, so that the positioning frame 6 can move smoothly downward by its own gravity when it descends in the stator 3. Since the length of the plate is greater than or equal to the height of the rotor 4, and the magnetic shielding plate 5 is fixed by the fixing block 51 at the lower end, the magnetic shielding plate 5 can completely shield the outer circumference of the rotor 4. In addition, during the assembly of the rotor 4, the magnetic shielding plate 5 will not have any end or edge located inside the stator 3 except for the lower end face. This avoids the magnetic shielding plate 5 from being contacted or scraped by the inner wall of the stator 3 due to the relatively small air gap between the stator and rotor 4 and the presence of a splicing seam in the middle of the magnetic shielding plate 5 during the assembly process, which would cause the magnetic shielding plate 5 to lift up or get stuck between the stator and rotor 4. Meanwhile, due to the chamfered edge of the fixing block 51 on the magnetic shielding plate 5 and the fact that the fixing block 51 is located at the lower end of the magnetic shielding plate 5, the chamfer on the fixing block 51 guides and directs the rotor 4 when it enters the stator 3 during the assembly process of the rotor 4. Furthermore, the lower end of the magnetic shielding plate 5 is fixed, which also ensures that the magnetic shielding plate 5 can smoothly enter the stator 3 along with the rotor 4. By opening a connecting groove at the upper end of the magnetic shielding plate 5 and installing a limiting ring 52 in the connecting groove, the upper end of the magnetic shielding plate 5 is positioned so that the upper part of the magnetic shielding plate 5 can be tightly attached to the surface of the rotor 4, and to prevent the upper end of the magnetic shielding plate 5 from tilting up and scraping against the inner wall of the stator 3 during assembly. Furthermore, the positioning and fixing by the limiting ring 52 reduces the number of bolts used for fixing the magnetic shielding plate 5, making it easier to install and disassemble the magnetic shielding plate 5.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large permanent magnet motor stator and rotor assembly device, characterized in that: Includes a base plate (1), on which a circular platform plate (12) is mounted via a support plate (11), and a stator (3) is placed on the platform plate (12); A stop ring (14) is installed on the platform plate (12). The stop ring (14) is pressed and fixed by the fixing plate (13). The stop ring (14) is located outside the stator (3). A positioning cylinder (2) is installed on the base plate (1), and a guide shaft (7) is inserted into the positioning cylinder (2). The guide shaft (7) passes through the middle of the stator (3), and the rotor (4) is installed into the stator (3) from top to bottom along the guide shaft (7). The stator (3) is provided with a positioning frame (6), the positioning frame (6) includes a collar (61), the collar (61) is slidably mounted on the guide shaft (7), and the outer side of the collar (61) is provided with evenly distributed ejector rods (63), the other end of the ejector rod (63) is fixedly mounted with a contact arc plate (64), and the contact arc plate (64) abuts against the inner wall of the stator (3); The positioning frame (6) moves gradually from the upper end to the lower end of the stator (3) as the rotor (4) is assembled into the stator (3). The rotor (4) is equipped with an upper baffle (41) and a lower baffle (42) at both ends. A lifting ring is installed on the upper baffle (41), and a magnetic shielding plate (5) is installed on the outside of the rotor (4).

2. The large permanent magnet motor stator and rotor assembly device according to claim 1, characterized in that: The inner wall of the positioning cylinder (2) is provided with an installation groove, and multiple sets of hydraulic bladders (22) are installed in the installation groove. The hydraulic bladders (22) are evenly distributed along the circumference of the installation groove. The hydraulic bladders (22) are interconnected and connected to an external hydraulic pump station. The inner diameter of the positioning cylinder (2) is larger than the diameter of the guide shaft (7). An inclined surface is provided at the entrance of the positioning cylinder (2). An isolation layer (24) is installed on the inclined surface. The isolation layer (24) is made of polytetrafluoroethylene.

3. The large permanent magnet motor stator and rotor assembly device according to claim 2, characterized in that: The inner diameter of the hydraulic bladder (22) before expansion is larger than the inner diameter of the positioning cylinder (2), and the chamfered edges of the upper and lower sides of the mounting groove become chamfered surfaces (23); The positioning cylinder (2) is fixedly installed on the base plate (1) by the support plate (21). There is a gap between the lower end of the positioning cylinder (2) and the base plate (1). The lower end face of the guide shaft (7) contacts the surface of the base plate (1).

4. The large permanent magnet motor stator and rotor assembly device according to claim 1, characterized in that: The positioning frame (6) includes upper and lower sets, and a sliding rod (65) is slidably installed on the positioning frame (6). The sliding rod (65) passes through the collars (61) of the upper and lower sets. The upper and lower sets of positioning frames (6) are staggered with each other.

5. The large permanent magnet motor stator and rotor assembly device according to claim 4, characterized in that: The positioning frame (6) is equipped with an abutment rod (62), the upper end of which is equipped with an elastic layer. The abutment rod (62) is a telescopic rod, and the upper end of the abutment rod (62) is in contact with the lower baffle (42) on the rotor (4).

6. The large permanent magnet motor stator and rotor assembly device according to claim 5, characterized in that: The collar (61), contact arc plate (64), and abutment rod (62) are made of non-magnetic materials.

7. The large permanent magnet motor stator and rotor assembly device according to claim 1, characterized in that: Multiple separate magnetic shielding plates (5) are installed on the outer circumferential surface of the rotor (4). The magnetic shielding plate (5) is in the shape of an inverted L. The magnetic shielding plate (5) includes a plate body and a fixing block (51). The fixing block (51) is installed on the lower baffle (42) by bolts. The edge of the fixing block (51) near the stator (3) is chamfered. The length of the plate is greater than or equal to the height of the rotor (4), and the end of the plate away from the fixing block (51) is close to the upper end of the rotor (4).

8. The large permanent magnet motor stator and rotor assembly device according to claim 7, characterized in that: A connecting groove is provided at one end of the plate away from the fixing block (51), and a limiting ring (52) is installed in the connecting groove. The limiting ring (52) presses the plate tightly against the outer circumference of the rotor (4).

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