Vertical lossless clamping system for large motor stator

Abstract

The invention discloses a vertical lossless clamping system for a large motor stator. The clamped large motor stator comprises an annular stator iron core, and annular end coils are arranged at the two ends of the annular stator iron core; comprising a guide rail platform, and a plurality of radially-distributed guide rail grooves are distributed in the guide rail platform in a circumferential array mode. A plurality of sliding tables are arranged on the upper side of the guide rail platform in a circumferential array mode, each sliding table corresponds to one guide rail groove, and sliding blocks on the lower sides of the sliding tables are arranged in the corresponding guide rail grooves in a sliding fit mode, so that the sliding tables move horizontally in the extending direction of the corresponding guide rail grooves. The upper side distance of each sliding table is fixedly provided with a vertical supporting frame which is vertically and upwards derived; in the clamping process, friction damage caused when rigid lateral acting force is applied to the peripheral face of the attached annular end coil by the inner arc faces of the upper portions of the four vertical supporting frames is effectively restrained.

Description

Technical Field

[0001] The present invention belongs to the field of motor assembly. Background Art

[0002] For motors with a center height H400 or above, due to their large size and heavy weight, during the assembly of large motors, a hoisting device is required to first hoist the large motor stator 51 in a vertical posture onto a vertical clamping device, and then install the stator housing and rotor, etc. by using gravity inertia on the basis of vertical clamping;

[0003] As Figure 1 and 2 shown, the large motor stator 51 includes an annular stator core 1, and both ends of the annular stator core 1 are annular end coils 3; both ends of the annular stator core 1 are annular end coils 3. Since the coils are exposed, they are fragile and easily deformed parts. When vertically clamping the large motor stator 51, the end coils 3 cannot contact the ground and are subject to rigid lateral forces and high-strength sliding frictions. Summary of the Invention

[0004] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a vertical non-destructive clamping system for a large motor stator, which effectively inhibits frictional damage formed between the inner arc surfaces of the upper parts of four vertical support frames applying rigid lateral forces to the outer peripheral surfaces of the fitted annular end coils during the clamping process.

[0005] Technical Solution: To achieve the above object, a vertical non-destructive clamping system for a large motor stator of the present invention, the large motor stator to be clamped includes an annular stator core, and both ends of the annular stator core are annular end coils.

[0006] It includes a guide rail platform, and a number of radially distributed guide rail grooves are arranged in a circumferential and integral array on the guide rail platform.

[0007] A number of sliding platforms are arranged in a circumferential array on the upper side of the guide rail platform. Each sliding platform corresponds to a guide rail groove, and the slider on the lower side of the sliding platform is slidably matched with the corresponding guide rail groove, so that the sliding platform translates along the extending direction of the corresponding guide rail groove; vertical support frames extending upward are fixedly installed on the upper sides of each sliding platform at equal distances.

[0008] Further, the inner sides of a number of vertical support frames are arc surfaces; in the state where the large motor stator in a vertical posture is clamped, the inner arc surfaces of the upper parts of a number of vertical support frames are arranged in a circumferential and integral array and fit the outer peripheral surfaces of the lower annular end coils of the large motor stator; and the upper ends of a number of vertical support frames support the lower end surface of the annular stator core upward.

[0009] Further, a reinforcing rib is provided at the connection between the sliding platform and the vertical support frame.

[0010] Furthermore, a base platform is arranged at a certain distance below the guide rail platform, and the base platform fixedly supports the upper guide rail platform through a number of support columns.

[0011] Furthermore, a central axis through hole runs through the guide rail platform vertically at its geometric center. There is also a central column that movably passes through the central axis through hole coaxially. At the upper end of the central column, a tray is fixedly connected coaxially. A support spring is sleeved outside the central column, and the upper end of the support spring elastically supports the tray. Above the tray, a lifting ring plate is fixedly connected coaxially through a number of lower connecting arms. Above the lifting ring plate, a floating ring plate is coaxially supported by an inflated annular support airbag. Inside the annular support airbag is an annular airbag cavity; an air pump is arranged on the lifting ring plate or the floating ring plate, and the air pump can pump air into the annular airbag cavity. A manual or electric air release nozzle is arranged on the annular support airbag;

[0012] Above the floating ring plate, a ring-shaped end coil drag is fixedly connected coaxially through a number of upper connecting arms, and the ring-shaped end coil drag is within the range enclosed by a number of vertical support frames;

[0013] At the lower end of the central column, a traction disc is fixedly connected coaxially;

[0014] The traction disc is respectively traction-connected to the lower parts of a number of vertical support frames through a number of traction ropes distributed in a circular array.

[0015] Furthermore, a number of fixed pulleys are arranged in a circular and integral array around the central column on the upper side of the guide rail platform, and the pulley seats of each fixed pulley are fixed on the guide rail platform; on one side of each fixed pulley away from the central column, there is a corresponding vertical support frame;

[0016] On the guide rail platform, a number of vertically hollowed traction rope through holes are arranged in a circular and integral array around the central column. The traction rope through holes are distributed between each pulley seat and the central column; the middle parts of a number of traction ropes respectively cross a number of fixed pulleys.

[0017] Furthermore, a section of the traction rope between the fixed pulley and the corresponding vertical support frame is the horizontal section of the traction rope, and a section of the traction rope between the fixed pulley and the traction disc is the vertical section of the traction rope. The vertical section of the traction rope passes through the corresponding traction rope through hole.

[0018] Furthermore, in step one, in the initial state, the annular support airbag is inflated, and the four vertical support frames are in a state of moving away from each other;

[0019] In step two, the hoisting device hoists the large motor stator directly above the ring-shaped end coil drag;

[0020] In step three, the hoisted large motor stator slowly descends in a vertical posture until the lower end of the ring-shaped end coil at the lower part of the large motor stator touches the upper surface of the ring-shaped end coil drag, and there is a certain distance between the inner arc surfaces at the upper ends of the four vertical support frames and the outer peripheral surface of the ring-shaped end coil;

[0021] Step 4: The large motor stator being hoisted continues to descend slowly. The annular end coil at the lower part of the large motor stator generates a downward thrust on the annular end coil drag, causing the central column and the traction plate to gradually displace downward. The gradually descending traction plate synchronously pulls four vertical support frames through respective traction ropes, causing the four vertical support frames to synchronously move gradually closer to the annular end coil under the guidance of their respective guide rail grooves until the inner arc surfaces at the upper parts of the four vertical support frames just fit the outer circumference of the annular end coil at the lower part of the large motor stator. At this time, there is still a certain distance between the upper ends of the four vertical support frames and the lower end surface of the circular stator core of the large motor stator.

[0022] Step 5: At this time, open the manual or electric air release nozzle on the annular support airbag, so that the gas in the annular support airbag is gradually discharged. Thus, the annular support airbag automatically deflates after the gas is released. The annular end coil drag naturally descends under the action of gravity and separates from the lower end of the annular end coil at the lower part of the large motor stator being hoisted. Then immediately lock the sliders in each guide rail groove to lock the positions of the four vertical support frames at this time.

[0023] Step 6: The large motor stator being hoisted continues to descend slowly until the upper ends of the four vertical support frames support and contact the lower end surface of the circular stator core of the large motor stator.

[0024] Beneficial effects: The present invention effectively inhibits the rigid lateral force and frictional damage exerted by the inner arc surfaces at the upper parts of the four vertical support frames on the outer circumferential surface of the annular end coil being fitted during the clamping process. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the first embodiment;

[0026] Figure 2 It is a schematic diagram when the large motor stator of the first embodiment is being hoisted;

[0027] Figure 3 It is a schematic diagram when the large motor stator of the first embodiment is being clamped;

[0028] Figure 4 It is a schematic diagram of the clamping device of the second embodiment after improving the clamping device based on the first embodiment;

[0029] Figure 5 It is a schematic diagram when the large motor stator of the second embodiment is being hoisted;

[0030] Figure 6 It is a schematic diagram when the large motor stator of the second embodiment is being clamped;

[0031] Figure 7 ForFigure 6 Partial enlarged schematic view;

[0032] Figure 8 is Figure 4 Schematic three-dimensional structure diagram after hiding the guide rail platform and the base platform on the basis of

[0033] Figure 9 Cross-sectional view of the annular support airbag. Specific implementation manner

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] The large motor stator 51 to be clamped includes a circular stator core 1, and both ends of the circular stator core 1 are annular end coils 3; the annular end coils 3 at both ends of the circular stator core (1) are fragile and easily deformable parts, and the end coils cannot contact the ground, be subjected to rigid lateral forces and high-strength sliding frictional forces.

[0036] The clamping device of the "first embodiment" is as shown in the attached Figures 1 to 3 A vertical non-destructive clamping system for a large motor stator is shown: it includes a guide rail platform 14, and a number of radially distributed guide rail grooves 29 are arranged in a circumferential array on the guide rail platform 14; the guide rail platform 14 is a square platform, and the four guide rail grooves 29 all extend along the extension lines of the diagonals of the guide rail platform 14;

[0037] A number of sliding tables 21 are arranged in a circumferential array on the upper side of the guide rail platform 14, each sliding table 21 corresponds to a guide rail groove 29, and the slider on the lower side of the sliding table 21 is slidably matched in the corresponding guide rail groove 29, so that the sliding table 21 translates along the extension direction of the corresponding guide rail groove 29; the slider in this case has a locking function; vertical support frames 2 extending upward are fixedly installed on the upper sides of the sliding tables 21 at equal distances, and the inner sides of the number of vertical support frames 2 are arc surfaces; in the state where the large motor stator 51 in the vertical posture is clamped, the inner arc surfaces of the upper parts of the number of vertical support frames 2 are arranged in a circumferential array and fit the outer peripheral surface of the lower annular end coil 3 of the large motor stator 51; and the upper ends of the number of vertical support frames 2 support the lower end surface of the circular stator core 1 upward; a reinforcing rib 67 is arranged at the connection between the sliding table 21 and the vertical support frame 2.

[0038] The basic working process of the above first embodiment is that the hoisting device 48 hoists the large motor stator 51 in a vertical posture and translates it to directly above the clamping device, as Figure 2As shown, the hoisting device 48 then slowly lowers the large motor stator 51 in a vertical posture. Meanwhile, each sliding table 21 is adaptively translated along the extending direction of the corresponding guide groove 29 by manual or tool drive. During the process of gradually lowering the hoisted large motor stator 51, finally, the upper ends of the four vertical support frames 2 support and contact the lower end face of the circular stator core 1 of the large motor stator 51. The large motor stator 51 is supported by the upper ends of the four vertical support frames 2, and the inner arc surfaces of the upper parts of the four vertical support frames 2 just fit the outer peripheral surface of the annular end coil 3. Although the vertical clamping of the large motor stator 51 can be achieved during the above process, effectively avoiding the annular end coil 3 at the lower end of the large motor stator 51 from contacting the ground, the problem that the annular end coil 3 at the lower end of the large motor stator 51 is unable to effectively avoid being subjected to rigid lateral forces and high-strength sliding friction forces cannot be solved.

[0039] In order to avoid the problem that the annular end coil 3 at the lower end of the large motor stator 51 is subjected to rigid lateral forces and high-strength sliding friction forces during the process of the large motor stator 51 changing from the vertical hoisting state to being completely vertically clamped, a certain improvement is made in the second embodiment on the basis of the above "first embodiment". The specific content of the second embodiment is as follows:

[0040] As Figures 4 to 9 shown, a base platform 11 is arranged at a certain distance below the guide rail platform 14 on the basis of the structure of the "first embodiment". The base platform 11 fixedly supports the upper guide rail platform 14 through several support columns 9 at the edge.

[0041] A central axis through hole 63 runs through the guide rail platform 14 at the geometric center up and down. It also includes a central column 19 that coaxially and movably passes through the central axis through hole 63. The upper end of the central column 19 is coaxially and fixedly connected with a tray 8. A support spring 18 is sleeved outside the central column 19. The upper end of the support spring 18 elastically supports the tray 8. Above the tray 8, a lifting ring plate 7 is coaxially and fixedly connected through several lower connecting arms 15. Above the lifting ring plate 7, a floating ring plate 5 is coaxially supported by an inflated annular support airbag 16. The upper and lower ends of the annular support airbag 16 are hermetically and fixedly connected to the floating ring plate 5 and the lifting ring plate 7 along the contour respectively. The annular support airbag 16 is a composite material with a rubber inner wall and a high-strength nylon fiber fabric outer wall. An annular airbag cavity 17 is formed inside the annular support airbag 16. An air pump is arranged on the lifting ring plate 7 or the floating ring plate 5, and the air pump can pump air into the annular airbag cavity 17. A manual or electric air release nozzle is arranged on the annular support airbag 16.

[0042] Above the floating ring disk 5, a ring-shaped end coil drag 4 is coaxially and fixedly connected by a number of upper connecting arms 6. The ring-shaped end coil drag 4 is within the range enclosed by a number of vertical support frames 2. The lower end of the central column 19 is coaxially and fixedly connected with a traction disk 13. A number of fixed pulleys 20 are arranged in a circumferential array around the central column 19 on the upper side of the guide rail platform 14. The pulley seats 71 of each fixed pulley 20 are fixed on the guide rail platform 14. One side of each fixed pulley 20 away from the central column 19 corresponds to a vertical support frame 2. A number of vertically hollowed-out traction rope through holes 94 are arranged in a circumferential array around the central column 19 on the guide rail platform 14. The traction rope through holes 94 are distributed between each pulley seat 71 and the central column 19. The traction disk 13 is respectively traction-connected to the lower parts of a number of vertical support frames 2 through a number of traction ropes 10 arranged in a circumferential array. The middle parts of a number of traction ropes 10 respectively cross a number of fixed pulleys 20. The section of the traction rope 10 between the fixed pulley 20 and the corresponding vertical support frame 2 is the horizontal section 10.1 of the traction rope, and the section of the traction rope 10 between the fixed pulley 20 and the traction disk 13 is the vertical section 10.2 of the traction rope. The vertical section 10.2 of the traction rope passes through the corresponding traction rope through hole 94.

[0043] Working principle:

[0044] Step 1, in the initial state, the annular support airbag 16 is in a bulged and inflated state. The four vertical support frames 2 arranged in a circumferential array are in a state of moving away from each other. The ring-shaped end coil drag 4 is within the range enclosed by a number of vertical support frames 2.

[0045] Step 2, the hoisting device 48 hoists the large motor stator 51 in a vertical posture and translates it directly above the ring-shaped end coil drag 4.

[0046] Step 3, under the hoisting of the hoisting device 48, the large motor stator 51 slowly descends in a vertical posture until the lower end of the ring-shaped end coil 3 at the lower part of the large motor stator 51 touches the upper surface of the ring-shaped end coil drag 4. At this time, the ring-shaped end coil 3 at the lower part of the large motor stator 51 is within the range enclosed by the upper ends of the four vertical support frames 2, but there is a certain distance between the inner arc surfaces of the upper ends of the four vertical support frames 2 and the outer peripheral surface of the ring-shaped end coil 3.

[0047] Step 4: Under the hoisting of the hoisting device 48, the large motor stator 51 continues to slowly descend, so that the annular end coil 3 at the lower part of the large motor stator 51 generates a downward thrust on the annular end coil drag 4. This thrust is flexibly transmitted to the support spring 18 through the annular support airbag 16, so that the support spring 18 is adaptively compressed, and thus the central column 19 and the traction disc 13 gradually move downward. The gradually descending traction disc 13 synchronously pulls the four vertical support frames 2 through the respective traction ropes 10, so that the four vertical support frames 2 synchronously move gradually closer to the annular end coil 3 under the guidance of their respective guide grooves 29, so that the four vertical support frames 2 gradually close to restrain the annular end coil 3 at the lower end of the large motor stator 51 under hoisting. Since the annular support airbag 16 is a flexible structure, during the above process, the floating ring disc 5 slowly descends while floating adaptively in the horizontal direction; as the four vertical support frames 2 gradually approach each other, until the inner arc surfaces of the upper parts of the four vertical support frames 2 just fit the outer periphery of the annular end coil 3 at the lower part of the large motor stator 51, since the annular support airbag 16 is a flexible structure, under the transmission of force, the acting force between the inner arc surface of the upper part of the four vertical support frames 2 at this time and the outer peripheral surface of the annular end coil 3 in contact is flexible, thus avoiding the rigid acting force of the inner arc surface of the upper part of the four vertical support frames 2 on the outer peripheral surface of the contacted annular end coil 3 and causing damage to the annular end coil 3.

[0048] When the inner arc surfaces of the upper parts of the four vertical support frames 2 just fit the outer periphery of the annular end coil 3 at the lower part of the large motor stator 51, there is still a certain distance between the upper ends of the four vertical support frames 2 and the lower end surface of the circular stator core 1 of the large motor stator 51.

[0049] Step 5: At this time, open the manual or electric air release nozzle on the annular support airbag 16, so that the gas in the annular support airbag 16 is gradually discharged, so that the annular support airbag 16 automatically deflates after the gas is released. The annular end coil drag 4 naturally descends under the action of gravity and separates from the lower end of the annular end coil 3 at the lower part of the large motor stator 51 being hoisted, so that the downward thrust originally generated by the annular end coil 3 at the lower part of the large motor stator 51 being hoisted on the annular end coil drag 4 disappears, thus releasing the tension of the respective traction ropes 10, and reducing the acting force between the inner arc surface of the upper part of the four vertical support frames 2 and the outer peripheral surface of the annular end coil 3 in contact. Then immediately lock the sliders in the respective guide grooves 29, so that the positions of the four vertical support frames 2 at this time are locked. The acting force between the inner arc surface of the upper part of the four vertical support frames 2 in the locked state at this time and the outer peripheral surface of the annular end coil 3 in contact is further reduced compared with that in "Step 4", thus ensuring that the large motor stator 51 in the hoisting state can continue to slowly descend smoothly in the next step and avoiding frictional damage to the greatest extent.

[0050] Step Six: Finally, under the hoisting of the hoisting device 48, the large motor stator 51 continues to slowly descend until the upper ends of the four vertical support frames 2 come into contact with the lower end surface of the circular stator core 1 of the large motor stator 51, and the large motor stator 51 is supported by the upper ends of the four vertical support frames 2; then the hoisting device 48 is disassembled to complete the vertical non-destructive clamping process of the large motor stator 51.

[0051] Since the acting force between the inner arc surfaces of the upper parts of the four vertical support frames 2 in the locked state and the outer peripheral surfaces of the attached annular end coils 3 in the previous step is further reduced compared with that in "Step Four", the large motor stator 51 in the hoisting state can smoothly continue to slowly descend in this step, and effectively inhibits the formation of frictional damage between the inner arc surfaces of the upper parts of the four vertical support frames 2 and the outer peripheral surfaces of the attached annular end coils 3.

[0052] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A vertical non-destructive clamping system for a large motor stator, wherein the clamped large motor stator (51) comprises a circular stator core (1), and both ends of the circular stator core (1) are circular end coils (3); Features: It comprises a guide rail platform (14), on which a plurality of guide rail grooves (29) are distributed in a radial pattern in a circular arrangement; A plurality of slides (21) are arranged in a circular array on the upper side of the guide rail platform (14), each slide (21) corresponds to a guide rail groove (29), and a slider on the lower side of the slide (21) is slidably engaged in the corresponding guide rail groove (29), so that the slide (21) is translated along the extension direction of the corresponding guide rail groove (29); a vertical support frame (2) extending vertically upward is fixedly installed on the upper side of each slide (21).

2. According to claim 1, a vertical non-destructive clamping system for a large motor stator is characterized in that: The inner sides of the plurality of vertical support frames (2) are arc surfaces; when the large motor stator (51) in a vertical posture is clamped, the inner arc surfaces of the upper parts of the plurality of vertical support frames (2) are arranged in a circular row and fit the outer peripheral surface of the annular end coil (3) at the lower end of the large motor stator (51); and the upper ends of the plurality of vertical support frames (2) support the lower end surface of the annular stator core (1) upward.

3. The vertical non-destructive clamping system for a large motor stator according to claim 1 is characterized in that: A reinforcing rib (67) is provided at the connection between the slide (21) and the vertical support frame (2).

4. The vertical non-destructive clamping system for a large motor stator according to claim 2 is characterized in that: A base platform (11) is arranged at a distance below the guide rail platform (14), and the base platform (11) is fixedly supported by the guide rail platform (14) above via a plurality of support columns (9).

5. The vertical non-destructive clamping system for a large motor stator according to claim 4 is characterized in that: The guide rail platform (14) has a central axis through hole (63) passing through the geometric center thereof from top to bottom, and also includes a central column (19) coaxially movable through the central axis through hole (63), the upper end of the central column (19) is coaxially fixedly connected to a tray (8), the outer cover of the central column (19) is provided with a support spring (18), the upper end of the support spring (18) elastically supports the tray (8), the upper part of the tray (8) is coaxially fixedly connected to a lifting ring disk (7) through a plurality of lower connecting arms (15), the upper part of the lifting ring disk (7) is coaxially supported by a floating ring disk (5) coaxially supported by an annular support airbag (16) in an inflated state, the annular support airbag (16) contains an annular airbag cavity (17); an air pump is provided on the lifting ring disk (7) or the floating ring disk (5), the air pump can pump air into the annular airbag cavity (17), and a manual or electric air release nozzle is provided on the annular support airbag (16); An annular end coil drag (4) is coaxially fixedly connected to the floating ring disk (5) via a plurality of upper connecting arms (6), and the annular end coil drag (4) is within the enclosed range of a plurality of vertical support frames (2); The lower end of the central column (19) is coaxially fixedly connected with a traction disk (13); The traction plate (13) is respectively traction-connected to the lower parts of a plurality of vertical support frames (2) through a plurality of traction ropes (10) distributed in a circumferential array.

6. The vertical non-destructive clamping system for a large motor stator according to claim 5 is characterized in that: A plurality of fixed pulleys (20) are arranged in a circle around the central column (19) on the upper side of the guide rail platform (14), and the pulley seat (71) of each fixed pulley (20) is fixed on the guide rail platform (14); a vertical support frame (2) corresponds to a side of each fixed pulley (20) away from the central column (19); The guide rail platform (14) is provided with a plurality of vertically hollowed-out traction rope passage holes (94) arranged in a circle around the central column (19); the traction rope passage holes (94) are distributed between each pulley seat (71) and the central column (19); and the middle parts of the plurality of traction ropes (10) respectively cross over the plurality of fixed pulleys (20).

7. The vertical non-destructive clamping system for a large motor stator according to claim 6 is characterized in that: A section of the traction rope (10) between the fixed pulley (20) and the corresponding vertical support frame (2) is a horizontal section of the traction rope (10.1), and a section of the traction rope (10) between the fixed pulley (20) and the traction plate (13) is a vertical section of the traction rope (10.2). The vertical section of the traction rope (10.2) passes through the corresponding traction rope passing hole (94).

8. The clamping method of a vertical non-destructive clamping system for a large motor stator according to claim 7, characterized in that: Step 1: In the initial state, the annular support airbag (16) is inflated and the four vertical support frames (2) are in a state of being away from each other; Step 2: The hoisting device (48) moves the large motor stator (51) to the position just above the annular end coil drag (4); Step 3: The hoisted large motor stator (51) is slowly lowered in a vertical posture until the lower end of the annular end coil (3) at the lower part of the large motor stator (51) contacts the upper surface of the annular end coil drag (4), and there is a certain distance between the inner arc surface of the upper end of the four vertical support frames (2) and the outer peripheral surface of the annular end coil (3); Step 4: The hoisted large motor stator (51) continues to slowly descend, and the annular end coil (3) at the bottom of the large motor stator (51) generates a downward thrust on the annular end coil drag (4), so that the central column (19) and the traction disk (13) gradually move downward, and the gradually descending traction disk (13) synchronously pulls the four vertical support frames (2) through the traction ropes (10), so that the four vertical support frames (2) are synchronously moved closer to the annular end coil (3) under the guidance of their respective guide rail grooves (29), until the inner arc surfaces of the upper parts of the four vertical support frames (2) just fit the outer periphery of the annular end coil (3) at the bottom of the large motor stator (51), and there is still a certain distance between the upper ends of the four vertical support frames (2) and the lower end surface of the annular stator core (1) of the large motor stator (51); Step 5, at this time, the manual or electric air release nozzle on the annular support airbag (16) is opened, so that the gas in the annular support airbag (16) is gradually discharged, so that the annular support airbag (16) automatically deflates after the gas in the annular support airbag (16) is released, and the annular end coil drag (4) naturally descends under the action of gravity and separates from the lower end of the annular end coil (3) at the lower part of the hoisted large motor stator (51), and then the sliders in each guide groove (29) are immediately locked, so that the positions of the four vertical support frames (2) are locked at this time; Step 6: The hoisted large motor stator (51) continues to slowly descend until the upper ends of the four vertical support frames (2) contact the lower end surface of the annular stator core (1) of the large motor stator (51).

Images