A method for passing a core through a main motor of a heavy plate rolling mill

Abstract

The present application relates to a kind of thick plate rolling mill main motor core-penetrating method, comprising the following steps: step one: construction preparation;Step two: stator installation;Step three: rotor balancing;Step four: rotor primary core-penetrating;Step five: rotor secondary core-penetrating;Step six: rotor, stator drop position.This application increases fixed cable in the process of core-penetrating, greatly strengthens the stability of rotor in the whole process of core-penetrating, effectively avoids the bumping of rotor and stator in the process of core-penetrating;Rope sling of rotor adopts the way of short sling band cooperating electric hoist, which greatly shortens the length of rope sling, and can make the whole descending process more accurate, fast and reliable by the control of electric hoist during the descending process of stator and rotor;When switching the hanging point of rope sling from primary core-penetrating to secondary core-penetrating, the hanging point of rope sling is directly replaced without temporary fixing by using aerial support, which makes the whole switching process more economical, fast and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of installation of a main motor of a rolling mill, in particular to a core threading method of a main motor of a thick plate rolling mill. Background Art

[0002] At present, wide and thick plate production lines generally use double-stand four-roll reversible rolling mills, which are divided into roughing mills and finishing mills. This type of rolling mill has two working rolls and two support rolls. The two working rolls are driven by large motors respectively. The motors generally use AC speed-regulated synchronous motors. The motors are usually arranged front and back and up and down. The front lower motor is used to drive the lower working roll of the rolling mill, and the rear upper motor is used to drive the upper working roll of the rolling mill.

[0003] Due to the large size and weight of the main motors for thick and wide plate mills, hoisting them requires large lifting machinery. Furthermore, since the main motor installation has high requirements for external environments such as air humidity and cleanliness, it must be installed within a closed factory building. Therefore, the cranes installed within the factory building are the only options for hoisting. To reduce the investment costs of hoisting machinery and factory building construction, the lifting capacity of the cranes within the factory building is generally set to meet the needs of motor core pulling and is only sufficient to hoist the motor rotor. Furthermore, the crane's maximum lifting height is determined by the maximum lifting height limit of the upper motor rotor.

[0004] The current mainstream installation method for the main motors of wide and heavy plate mills is essentially an on-site, online core threading installation method. The overall installation sequence is to install the lower motor first, then the upper motor. The installation sequence for a single motor is to first install the stator, then thread the core to complete the rotor installation, and finally complete the installation of the motor's ancillary equipment. The hoisting machinery uses a gantry crane in the main motor plant, and the core threading is completed using a balance beam combined with a sling and a fall chain. The existing technology has the following shortcomings:

[0005] 1. The existing technology balance beam rotor lifting point is fixed and determined in advance by calculation. If the type of slings and fall chains on site changes, the fixed lifting point cannot ensure the level of the balance beam. Moreover, it can only adapt to the lifting of one type of motor rotor and is not universal.

[0006] 2. Since the air gap between the rotor and the stator is relatively small, generally about 10mm-20mm for large motors, the lifting device needs to be kept balanced and stable during the core threading process of the motor. That is, the rotor always remains horizontal during the core threading process, and the up and down, front and back swinging amplitude of the rotor during the movement cannot exceed the gap between the rotor and the stator to prevent the rotor and stator from colliding and damaging the equipment. The existing technology has not yet addressed measures to maintain the balance and stability of the rotor during the lifting process.

[0007] 3. In the prior art, when changing the hanging point after one core penetration, the rotor needs to be temporarily supported to complete the change of the hanging point, which requires additional temporary facilities, poor stability and low efficiency.

[0008] 4. The rotor sling in the prior art uses a hand chain hoist, which has poor stability and low construction efficiency during the lowering process of the rotor and stator. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a core-threading method for a main motor of a thick plate rolling mill, which solves the technical problem of poor stability of a hoisting system in the prior art and improves the efficiency of core-threading construction.

[0010] The technical solution adopted by the present invention to solve the technical problem is: to provide a core threading method for the main motor of a thick plate rolling mill, comprising the following steps:

[0011] Step 1: Construction preparation;

[0012] It includes: handover of civil equipment foundation, plant enclosure, and acceptance of plant crane. The handover of civil equipment foundation requires verification of the foundation elevation, center line, and outline dimensions, and that the elevation and center line of embedded bolts and anchor plates meet the design requirements of the drawings. The walls and roof around the enclosed plant must not leak, otherwise rainwater entering the equipment base will cause the insulation of the motor bearing seat to fail. The plant crane must pass the acceptance of the special inspection institute, and all performance indicators must meet the design requirements. The crane must operate stably to ensure the safety of the lifting process. The crane is a gantry crane.

[0013] Step 2: stator installation;

[0014] First, install the motor base plate. After measurement, adjustment and acceptance, install the stator and rotor bearing seats. Only the lower part of the bearing seat at the load end of the rotor is installed on the rotor bearing seat, and the non-load end is not installed. Place two sets of pads at the four corners of the stator. The fixed pad plate group is placed at the bottom of the stator, and the lifting pad plate group is placed at the bottom of the stator lifting plate. A screw jack is set on the upper part of the lifting pad plate group, and the screw jack rod is in the raised state.

[0015] Step 3: Rotor balancing;

[0016] First, hoist the rotor from the transport rack to the through-core lifting position, place the rotor on two temporary rotor support frames, assemble the rotor's non-load-end bearing seat onto the rotor's non-load-end bearing as a counterweight for rotor hoisting, and simultaneously assemble the extension shaft onto the rotor's load-end bearing end face; hoist the balance beam with the gantry crane, hang three sets of rotor slings on the balance beam, connect the rotor's non-load-end bearing slings and load-end bearing slings to the rotor, and temporarily fix the first electric fall chain on the rotor extension shaft sling with its chain and hook on the balance beam; conduct a trial lift of the rotor, and make the balance beam level by adjusting the position of the sling hanging on the balance beam, and make the rotor level by adjusting the fall chain on the sling;

[0017] Step 4: Rotor core passing once;

[0018] Operate the gantry crane to slowly move the rotor toward the stator, and stop when the extended shaft of the rotor approaches the end face of the stator; adjust the rotor elevation and horizontal distance by raising and lowering the gantry crane's main hook and moving the trolley to ensure that the rotor centerline and the stator centerline coincide;

[0019] Step 5: Rotor secondary core threading;

[0020] First, safely lower the chain and hook of the first electric fall chain on the rotor extension shaft sling, connect it to the short sling of the rotor extension shaft, tighten the first electric fall chain to put the entire rotor extension shaft sling in a stressed state, and loosen the load-end bearing sling; then open the joint of the load-end bearing sling, straighten the two ends of the load-end bearing sling and fix them on the lower beams on both sides of the gantry crane. The height of the straightened load-end bearing sling should be higher than the top surface of the stator housing; adjust the second electric fall chain of the rotor non-load-end bearing sling and the first electric fall chain of the extension shaft end sling to make the rotor horizontal and in the center of the stator, add left and right fixed cables on both sides of the extension shaft, fix the left and right fixed cables on both sides to the lower beam of the gantry crane, and tighten the manual fall chains of the left and right fixed cables; jog the gantry crane to continue moving the rotor toward the inner cavity of the stator, and observe that a safe gap is maintained between the rotor and the stator while moving, until the center line of the rotor coincides with the center line of the stator;

[0021] Step 6: The rotor and stator are lowered into place.

[0022] As a supplement to the technical solution described in the present invention, in the step four, in order to ensure the stability of the rotor during the core threading process, a rear fixing cable and left and right fixing cables are added to the non-load bearing end of the rotor, the rear fixing cable is fixed to the anchor on the ground, and the left and right fixing cables are fixed to the bottom beam of the gantry crane; the left and right fixing cables are tightened by a manual fall chain, and the rear fixing cable is first pre-tightened by the manual fall chain. The wire rope is synchronously loosened by the manual fall chain during the rotor core threading process to ensure that the rotor does not swing forward too much due to inertia when the gantry crane is moved.

[0023] As a supplement to the technical solution described in the present invention, in the step 4, after the rotor center position adjustment is completed and the left and right fixing cables and the rear fixing cable are set, the gantry crane is operated to continue moving the rotor toward the stator cavity until the rotor load end bearing cable approaches the stator end face.

[0024] As a supplement to the technical solution described in the present invention, the specific steps of step six are as follows: slightly lift the screw jacks at the four corners of the stator, pull out a pad from the fixed pad group, and at the same time lower the screw jacks at the four corners. When the gap between the stator and rotor tops is 10 mm, stop lowering the screw jacks; operate the four electric fall chains on the sling to lower the rotor until the gap between the rotor and the lower part of the stator is 10 mm; repeat the above process until the screw jack push rod drops to the bottom position, use flat pads and inclined pads to fill the gap between the fixed pad group and the stator bottom plate tightly, pull out the pad of the lifting pad group located under the screw jack, push out the screw jack push rod, and loosen the fixed pad group and the stator bottom plate, repeat the above steps until all pads are pulled out, the stator is completely positioned on the motor bottom plate, and the rotor is positioned on the rotor bearing seat. At this point, the core threading is completed, and the next step of adjusting the rotor and stator is entered.

[0025] Beneficial effects: The present invention relates to a method for threading the core of the main motor of a thick plate rolling mill. A fixed rope is added during the threading process, which greatly enhances the stability of the rotor during the threading process and effectively avoids the collision between the rotor and the stator during the threading process. The rotor sling adopts a short sling combined with an electric fall chain, which greatly shortens the length of the sling and can be controlled by the electric fall chain during the lowering of the stator and rotor, making the entire lowering process more accurate, fast and reliable. When switching the sling hanging point from the first threading to the second threading, the rotor does not need to be temporarily fixed with a pad, and the sling hanging point can be directly replaced, making the entire switching process more economical, fast and reliable. Therefore, this lifting system makes the entire threading process more reliable and stable, and also greatly improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the main motor core threading flow chart of the present invention;

[0027] Figure 2 1 is a schematic diagram of the installation of the stator according to the present invention;

[0028] Figure 3 1 is a schematic diagram of the rotor trim of the present invention;

[0029] Figure 4 This is a schematic structural diagram of the rotor primary core insertion according to the present invention;

[0030] Figure 5 This is a schematic structural diagram of the rotor secondary core penetration according to the present invention;

[0031] Figure 6 Schematic diagram of the rotor fixing cable arrangement according to the present invention.

[0032] Diagram: 1. Gantry crane, 2. Balance beam, 3. Rotor non-load end bearing sling, 4. Balance beam sling, 5. Rotor non-load end bearing seat, 6. Stator, 7. Extension shaft, 8. Rotor load end bearing sling, 9. Rotor, 10. Rotor extension shaft sling, 11. Rotor support frame, 12. Left and right fixing ropes, 13. Rear fixing rope, 14. Ground anchor, 15. Fixed pad group, 16. Lifting pad group, 17. Screw jack, 18. Motor base plate, 31. Second electric fall chain, 91. Rotor non-load end bearing, 92. Rotor load end bearing, 101. First electric fall chain, 102. Extension shaft sling short sling, 122. Manual fall chain. DETAILED DESCRIPTION

[0033] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0034] The embodiment of the present invention relates to a method for core threading of a main motor of a thick plate rolling mill, such as Figures 1-6 As shown, the following steps are included:

[0035] Step 1: Construction preparation;

[0036] Including: handover of civil equipment foundation, plant enclosure, and acceptance of plant crane. The handover of civil equipment foundation shall verify the elevation, center line, outline size of the foundation, and the elevation and center line of the embedded bolts and anchor plates shall meet the design requirements of the drawings; the walls and roof around the enclosed plant shall not leak, otherwise rainwater will enter the equipment base and cause the insulation of the motor bearing seat to fail. The plant crane must pass the acceptance of the special inspection institute, and all performance indicators must meet the design requirements. The crane must operate stably to ensure the safety of the lifting process. The crane is a gantry crane 1.

[0037] Step 2: stator installation;

[0038] First, install the motor base plate 18. After measurement, adjustment and acceptance, install the stator 6 and rotor bearing seat. The rotor bearing seat is only installed at the lower part of the bearing seat at the load end of the rotor, and the non-load end is not installed. Place two sets of pad groups at the four corners of the stator. The fixed pad plate group 15 is placed at the bottom of the stator, and the lifting pad plate group 16 is placed at the lower part of the stator lifting plate. A screw jack 17 is set on the upper part of the lifting pad plate group 16, and the screw jack 17 rod is in the raised state.

[0039] Step 3: Balancing of rotor 9;

[0040] First, the rotor 9 is hoisted and moved from the transport frame to the core lifting position, and the rotor 9 is placed on two temporary rotor support frames 11. The rotor non-load end bearing seat 5 is assembled to the rotor non-load end bearing 91 as a counterweight for the rotor 9 hoisting. At the same time, the extension shaft 7 is assembled to the end face of the rotor load end bearing 92. The gantry crane 1 lifts the balance beam 2 through the balance beam sling, suspends three sets of rotor slings on the balance beam 2, connects the rotor non-load end bearing sling 3 and the load end bearing sling 8 to the rotor 9, and temporarily fixes the first electric fall chain 101 on the rotor extension shaft sling 10 with its chain and hook on the balance beam 2. The rotor 9 is hoisted for trial, and the balance beam 2 is leveled by adjusting the position of the sling hanging on the balance beam 2. The rotor 9 is leveled by adjusting the fall chain on the sling.

[0041] Step 4: Rotor 9 is threaded once;

[0042] Operate the gantry crane 1 to slowly move the rotor 9 toward the stator 6, and stop when the extended shaft 7 of the rotor approaches the end face of the stator 6; adjust the elevation and horizontal distance of the rotor 9 by raising and lowering the main hook of the gantry crane 1 and moving the trolley to ensure that the center line of the rotor 9 coincides with the center line of the stator 6;

[0043] Step 5: Rotor 9 is threaded through the core twice;

[0044] First, lower the chain and hook of the first electric fall chain 101 on the rotor extension shaft sling 10 safely, connect it to the rotor extension shaft short sling 102, tighten the first electric fall chain 101 to put the entire rotor extension shaft sling 10 in a stressed state, and loosen the load-end bearing sling 8; then open the joint of the load-end bearing sling 8, straighten the two ends of the load-end bearing sling 8 and fix them on the lower crossbeams on both sides of the gantry crane 1. The height of the straightened load-end bearing sling 8 should be higher than the top surface of the stator 6 housing; adjust the rotor non-load end The second electric fall chain 31 of the bearing sling 3 and the first electric fall chain 101 of the rotor extension shaft sling 10 make the rotor 9 horizontal and at the center of the stator 6. Left and right fixed cables 12 are added on both sides of the extension shaft 7. The left and right fixed cables 12 are fixed to the lower crossbeam of the gantry crane 1 on both sides, and the manual fall chains 122 of the left and right fixed cables 12 are tightened. The gantry crane 1 is then inched to continue moving the rotor 9 into the inner cavity of the stator 6, while ensuring that a safe gap is maintained between the rotor 9 and the stator 6 until the center line of the rotor 9 coincides with the center line of the stator 6.

[0045] Step 6: The rotor 9 and stator 6 are lowered into place.

[0046] In the above-mentioned step 4, in order to ensure the stability of the rotor 9 during the core threading process, a rear fixing cable 13 and left and right fixing cables 12 are added to the non-load end bearing 91 of the rotor, the rear fixing cable 13 is fixed to the anchor on the ground, and the left and right fixing cables 12 are fixed to the bottom crossbeam of the gantry crane 1; the left and right fixing cables 12 are tightened by the manual fall chain 122, and the rear fixing cable 13 is first pre-tightened by the manual fall chain 122. During the core threading process of the rotor 9, the steel wire rope is synchronously loosened by the manual fall chain 122 to ensure that the rotor 9 does not swing forward too much due to inertia when the gantry crane 1 is inched.

[0047] In step 4, after the center position of the rotor 9 is adjusted and the left and right fixing cables 12 and the rear fixing cable 13 are set, the gantry crane 1 is operated to move the rotor 9 further toward the inner cavity of the stator 6 until the rotor load end bearing cable 8 approaches the end face of the stator 6.

[0048] The specific steps of the step six are as follows: slightly lift the screw jacks 17 at the four corners of the stator 6, pull out a pad of the fixed pad group 15, and at the same time lower the screw jacks 17 at the four corners. When the gap between the stator and rotor top is about 10 mm, stop lowering the screw jacks 17; operate the four electric fall chains on the sling to lower the rotor 9 until the gap between the rotor 9 and the lower part of the stator 6 is about 10 mm; repeat the above process until the screw jack 17 push rods drop to the bottom position, use flat pads and inclined pads to fill the gap between the fixed pad group 15 and the stator 6 bottom plate tightly, pull out the pad of the lifting pad group 16 located below the screw jack 17, push out the screw jack 17 push rods, and loosen the fixed pad group 15 and the stator 6 bottom plate, repeat the above steps until all pads are fully pulled out, the stator 6 is fully positioned to the motor base plate 18, and the rotor 9 is located on the rotor bearing seat. At this point, the core is completed and the next step of adjusting the rotor 9 and the stator 6 is entered.

[0049] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0052] The above is a detailed introduction to the core threading method of the main motor of a thick plate rolling mill provided by this application. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method of this application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

Claims

1. A method for threading the core of a main motor of a thick plate rolling mill, characterized by: The following steps are involved: Step 1: Construction preparation; Including: handover of civil engineering equipment foundation, factory building closure, factory building crane acceptance, among which the handover of civil engineering equipment foundation must verify the elevation, center line, outline size of the foundation, and the elevation and center line of the embedded bolts and anchor plates meet the design requirements of the drawings; the walls and roofs around the factory building closure must not leak, otherwise rainwater entering the equipment base will cause the insulation of the motor bearing seat to fail to meet the standards; the factory building crane must pass the acceptance of the special inspection institute, and all performance indicators must meet the design requirements. The crane must operate stably to ensure the safety of the lifting process. The crane is a gantry crane (1); Step 2: stator installation; First, the motor base plate (18) is installed. After the measurement and adjustment are qualified, the stator (6) and the rotor bearing seat are installed. The rotor bearing seat is only installed at the lower part of the bearing seat at the load end of the rotor, and the non-load end is not installed. Two sets of pad groups are placed at the four corners of the stator. The fixed pad group (15) is placed at the bottom of the stator, and the lifting pad group (16) is placed at the lower part of the stator lifting plate. A screw jack (17) is set on the upper part of the lifting pad group (16), and the screw jack (17) rod is in a raised state. Step 3: Balancing the rotor (9); First, the rotor (9) is hoisted and moved from the transport frame to the core lifting position, the rotor (9) is placed on two temporary rotor support frames (11), the rotor non-load end bearing seat (5) is assembled on the rotor non-load end bearing (91) as a counterweight for the rotor (9) hoisting, and the extension shaft (7) is assembled on the end face of the rotor load end bearing (92); the gantry crane (1) hoists the balance beam (2), hangs three sets of rotor slings on the balance beam (2), connects the rotor non-load end bearing sling (3) and the load end bearing sling (8) to the rotor (9), and temporarily fixes the first electric fall chain (101) on the rotor extension shaft sling (10) with its chain and hook on the balance beam (2); the rotor (9) is hoisted for trial, and the balance beam (2) is leveled by adjusting the position of the sling hanging on the balance beam (2), and the rotor (9) is leveled by adjusting the fall chain on the sling; Step 4: The rotor (9) is threaded through the core once; Operate the gantry crane (1) to slowly move the rotor (9) toward the stator (6), and stop when the extended shaft (7) of the rotor approaches the end face of the stator (6); adjust the elevation and horizontal distance of the rotor (9) by raising and lowering the main hook of the gantry crane (1) and moving the trolley to ensure that the center line of the rotor (9) and the center line of the stator (6) coincide with each other; Step 5: Rotor (9) is threaded through the core twice; First, lower the chain and hook of the first electric fall chain (101) on the rotor extension shaft sling (10) safely, connect it to the rotor extension shaft short sling (102), tighten the first electric fall chain (101) to put the entire rotor extension shaft sling (10) in a stressed state, and loosen the load-end bearing sling (8); then open the joint of the load-end bearing sling (8), straighten the two ends of the load-end bearing sling (8) and fix them on the lower crossbeams on both sides of the gantry crane (1); the height of the straightened load-end bearing sling (8) should be higher than the top surface of the stator (6) housing; adjust the rotor non-load end bearing sling (3) The second electric fall chain (31) and the first electric fall chain (101) of the rotor extension shaft sling (10) make the rotor (9) horizontal and located at the center of the stator (6), and left and right fixed ropes (12) are added on both sides of the extension shaft (7), and both sides of the left and right fixed ropes (12) are fixed on the lower crossbeam of the gantry crane (1), and the manual fall chains (122) of the left and right fixed ropes (12) are tightened; the gantry crane (1) is moved in a short time to continue moving the rotor (9) toward the inner cavity of the stator (6), and a safe gap is maintained between the rotor (9) and the stator (6) while moving, until the center line of the rotor (9) coincides with the center line of the stator (6); Step 6: The rotor (9) and stator (6) are lowered into place.

2. A method for core threading of a main motor of a thick plate rolling mill according to claim 1, characterized in that: In the fourth step, in order to ensure that the rotor (9) is stable during the core threading process, a rear fixing rope (13) and left and right fixing ropes (12) are added to the rotor non-load end bearing (91), the rear fixing rope (13) is fixed to the anchor (14) on the ground, and the left and right fixing ropes (12) are fixed to the bottom crossbeam of the gantry crane (1); the left and right fixing ropes (12) are tightened by the manual fall chain (122), the rear fixing rope (13) is first pre-tightened with the wire rope by the manual fall chain (122), and the wire rope is synchronously loosened by the manual fall chain (122) during the core threading process of the rotor (9), so as to ensure that the rotor (9) does not swing forward too much due to inertia when the gantry crane (1) is inched.

3. A method for core threading of a main motor of a thick plate rolling mill according to claim 1, characterized in that: In the fourth step, after the center position of the rotor (9) is adjusted and the left and right fixing cables (12) and the rear fixing cable (13) are set, the gantry crane (1) is operated to move the rotor (9) further toward the inner cavity of the stator (6) until the load-end bearing cable (8) of the rotor (9) approaches the end face of the stator (6).

4. A method for core threading of a main motor of a thick plate rolling mill according to claim 1, characterized in that: The specific steps of step six are as follows: slightly lift the screw jacks (17) at the four corners of the stator (6), extract a pad from the fixed pad group (15), and at the same time lower the screw jacks (17) at the four corners. When the gap between the stator and rotor tops is 10 mm, stop lowering the screw jacks (17); operate the four electric fall chains on the sling to lower the rotor (9) until the gap between the rotor (9) and the lower part of the stator (6) is 10 mm; repeat the above process until the screw jack (17) top rod drops to the bottom position, and use the flat pad to lower the screw jacks (17). , fill the gap between the fixed pad group (15) and the stator (6) bottom plate tightly with the inclined pad, pull out the pad of the lifting pad group (16) located under the screw jack (17), push out the screw jack (17) push rod, and loosen the fixed pad group (15) and the stator (6) bottom plate, repeat the above steps until all the pads are pulled out, the stator (6) is completely placed on the motor bottom plate (18), and the rotor (9) is placed on the rotor bearing seat. At this point, the core is completed and the next step is to adjust the rotor (9) and stator (6).

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