Core pulling and core penetrating construction method for large synchronous motor

Abstract

The invention relates to the field of motor disassembly and maintenance, in particular to a large synchronous motor core-pulling and core-penetrating construction method which is used for disassembling and maintaining a large synchronous motor through the steps of equipment checking, motor disassembly, matched hoisting, core-pulling detection, motor core penetrating, overall hoisting, supporting core-pulling, core-penetrating reassembly and the like. By means of the matched lifting mode, a large-load lifting appliance does not need to be additionally placed when the load of the lifting appliance on site is insufficient, the construction time can be shortened, the construction process is simplified, meanwhile, the construction investment is reduced, and the whole core pulling and core penetrating process is smoother and more efficient. Meanwhile, the risk of equipment damage caused by overlarge local stress can be reduced; after the rotor and the stator are completely separated, the stator and the rotor are cleaned, after burrs are removed, dough detection is carried out, parts such as a machine shell and a tilting fillet are cleaned, the flatness of the surfaces of the parts such as the machine shell, a bearing bush and the tilting fillet can be known by observing the contact surfaces of the dough and the parts such as the machine shell, the bearing bush and the tilting fillet, and meanwhile the detection cost of the parts such as the machine shell, the bearing bush and the tilting fillet can be effectively controlled.

Description

Technical Field

[0001] The invention relates to the field of motor disassembly and maintenance, and in particular to a core pulling and core threading construction method for a large synchronous motor. Background Art

[0002] Large synchronous motors are usually large and heavy, with complex structures consisting of multiple components such as stators, rotors, bearing seats, cooling systems, etc. These components play a key role in the operation of the motor, but also make the maintenance and overhaul of the motor complicated.

[0003] In the prior art, when a large synchronous motor is to be overhauled, it is necessary to separate the stator and rotor of the motor, and then reassemble them after the overhaul is completed, which is the core pulling and core threading process. However, due to its large size and weight, a large-load lifting device must be prepared on site. If a large-load lifting device is not available on site, a lifting device that meets the lifting conditions must be brought in. The cost of bringing in a lifting device that meets the conditions is high and consumes time, which greatly increases the time cost and maintenance cost of the overhaul of the large synchronous motor. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a synchronous motor core pulling and core threading construction method, which can reduce the investment cost of the hanger and reduce the inspection and maintenance hours and maintenance costs.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

[0006] A large synchronous motor core pulling and core threading construction method comprises the following steps.

[0007] Step 1: Check the equipment, prepare the hanging beams, extension shafts, stator lifting angle plates and pads, lay the stator core pulling and core penetration and temporary rotor padding planks, and place the stator placement fixture.

[0008] Step 2: Disassemble the motor, remove the motor cooling pipes, hydraulic pipes, and lubrication pipes, and wrap the pipe openings to prevent foreign matter from entering.

[0009] Remove the instruments, control circuits, motor cooling and ventilation systems.

[0010] After removing the above components, remove the motor housing and remove the main shaft connecting bolts using a hydraulic puller.

[0011] Remove the bearing cover, mark it and measure the original top clearance and side clearance.

[0012] If the disassembled motor exceeds the safe load of the sling, go to step 3 to step 5; if it does not exceed the safe load of the sling, go to step 3-1 to step 5-1.

[0013] Step 3: To cooperate with the lifting, place at least two jacks on both sides of the stator, install the stator lifting angle plate at the corresponding jack top force point, hang the wire rope at the force points on both sides of the rotor shaft, hang the wire rope on the lifting beam to lift the rotor, and start the jack to lift the stator through the stator lifting angle plate while lifting the rotor, so that the stator and rotor are lifted synchronously.

[0014] After the rotor and stator are synchronously lifted to the specified height, add pads on both sides of the stator to fix the stator height. After the stator height is fixed, connect the extended shaft with the rotor shaft.

[0015] Step 4: Core pulling inspection. After the stator is fixed, a wire rope is placed on one end of the rotor shaft and the extension shaft. The rotor is lifted horizontally along the axial direction of the rotor shaft. The rotor coil is lifted to the outside of the stator and separated from the stator. The arc wood is placed under the rotor to support the rotor. After support, the upper motor rotor is inspected to complete the upper motor core pulling inspection.

[0016] Step 5: After the core pulling test of the upper motor is completed, a steel wire rope is placed on one end of the rotor shaft and the extension shaft, and the rotor shaft is lifted horizontally along the axial direction. The arc wood is removed, and the rotor coil is lifted to the inside of the stator to complete the core pulling assembly, thereby completing the core pulling of the upper motor. After the core pulling is completed, the air gap of the rotor four axes is adjusted, and the magnetic center is aligned. The core pulling test steps and core pulling steps of the lower motor are the same as those of the upper motor.

[0017] Step 3-1: Lift as a whole, place the stator placement tooling on the laid rails, fix the wire rope of the lifting beam on the rotor shaft, lift the rotor together with the stator and lift them out of the motor installation pit, place them on the pre-installed stator placement tooling, and connect the extension shaft with the rotor shaft after placement.

[0018] Step 4-1: Support the core pulling, complete the connection between the extension shaft and the rotor shaft, lift the rotor and stator again, place a cushion block at one end of the rotor shaft and the end of the extension shaft, and fix one end of the rotor shaft and the cushion block, and the end of the extension shaft and the cushion block to complete the placement and support of the stator and rotor.

[0019] Remove the wire rope, fix the wire rope to the lifting lug on the top of the stator, lift the stator, move it along the rotor axis toward the extension axis, stop lifting until the rotor completely exposes the coil, lower the stator, and complete the initial separation of the rotor and stator.

[0020] After the rotor and stator are initially separated, remove the wire rope, fix one side of the wire rope to the end of the rotor shaft, and fix the other side of the wire rope to the rotor shaft between the coil and the stator, lift the rotor, remove the pads at the end of the extension shaft and one end of the rotor shaft, and then translate the rotor along the axial direction of the rotor shaft. After the rotor is translated until it is completely separated from the stator, place an arc-shaped wood under the rotor to complete the support core pulling. After the support core pulling is completed, inspect the rotor and stator.

[0021] Step 5-1: Fix the wire rope on one side to the end of the rotor shaft and the wire rope on the other side to the rotor shaft on the coil side. Hang the top of the wire rope on the hanging beam, adjust the wire rope so that it is perpendicular to the rotor axis, lift the rotor and insert it into the stator.

[0022] After the rotor penetrates the stator to the wire rope on the side of the coil, stop inserting. At this time, one end of the rotor shaft extension shaft has passed through the stator. Place pads on one end of the rotor shaft and the end of the extension shaft, and fix one end of the rotor shaft and the pad, and the end of the extension shaft and the pad.

[0023] After the two ends of the rotor are padded, fix the steel wire rope on the side of the coil and the steel wire rope at one end of the rotor shaft to the lifting ears on the top of the stator, lift the stator, and when the stator axis coincides with the rotor shaft axis, translate the stator to allow the rotor coil to be inserted into the stator.

[0024] When the stator and rotor coils are completely overlapped, adjust the air gap around the stator and rotor, drop the stator and pad it level with pads; stuff red steel paper into the air gap around the stator.

[0025] Fix the wire rope on the rotor shaft and lift the rotor and stator at the same time, drop the stator on the bottom plate, drop both ends of the rotor shaft into the bearing seat and align the magnetic center to complete the motor reinstallation;

[0026] The support core pulling steps and core threading and reinstallation steps of the upper motor and the lower motor are the same.

[0027] In the above-mentioned large synchronous motor core pulling and core penetration construction method, preferably, the suspension beam in step 1 is a shoulder beam, the extension shaft is an extension shaft that can be adapted to be connected with the rotor shaft, and the rail has a length of 2000 mm and a width and height of 200 mm.

[0028] In the above-mentioned large synchronous motor core pulling and core threading construction method, preferably, the stator placement tooling frame in step 1 includes a crossbeam and a column, the crossbeam specification is 20# H-shaped steel, the column specification is 20# channel steel, the columns are symmetrically and vertically arranged on the top of the crossbeam, the columns and the crossbeam are connected by angle steels, the angle steel specifications are 10# angle steels, and an upper beam is arranged on the top of the column, and the upper beam is 20# channel steel.

[0029] In the above-mentioned large synchronous motor core pulling and core threading construction method, preferably, the jack in step 3 is a 50T jack, the steel wire rope is a DN60 steel wire rope, and the steel wire rope is perpendicular to the rotor axis and the suspension beam when under stress.

[0030] In the above-mentioned large synchronous motor core pulling and core penetration construction method, preferably, the arc-shaped wood in step 4 and step 4-1 is 2000mm long, 200mm high, and 180mm wide, and an arc-shaped groove is opened at the top of the middle position of the arc-shaped wood, and the depth of the arc-shaped groove is 100mm.

[0031] In the above-mentioned large synchronous motor core pulling and core threading construction method, preferably, the air gap in step 5-1 is measured by a bevel gauge and a vernier caliper, and four points A, B, C, and D are taken at corresponding positions on the upper, lower, left, and right sides of the inner wall circumference of the stator for measurement. The measurement is carried out on a flat stator and rotor core, and the measured values ​​are used to calculate the average value Y of the air gap, wherein Y=(A+B+C+D) / 4, and the allowable error value is ±5% of the average value Y; the air gap is achieved by adjusting the pad at the bottom of the stator and moving the stator left and right.

[0032] In the above-mentioned large synchronous motor core pulling and core threading construction method, after the air gap is adjusted and the magnetic center is aligned, the bearing side gap and top gap are measured.

[0033] Specifically, when measuring, first take out the bearing temperature thermometer, pour oil on the shaft diameter, and after oiling the journal, rotate and take out the lower bearing shell, confirm that the lower bearing alloy surface and ball seat surface are intact, and then install the lower bearing shell, and measure the side clearance of the bearing shell with a feeler gauge. The side clearance is 1 / 2 of the top clearance.

[0034] After adjusting the lower bearing shell, assemble the upper bearing shell and measure the clearance between the upper bearing shell and the journal by lead pressure. The allowable value of the top clearance of the journal is (1D-1.5D) / 1000, where D is the shaft diameter. After completing the measurement of the bearing shell side clearance and top clearance, assemble the bearing cover and adjust the oil seal clearance.

[0035] Compared with the prior art, the large synchronous motor core pulling and core threading construction method of the present invention has at least the following beneficial effects:

[0036] 1. The core pulling and core threading construction method of a large synchronous motor of the present invention can effectively reduce the risk of overturning when the stator or rotor is lifted alone by cooperating with the lifting method to lift the large motor that exceeds the safe load-bearing capacity of the lifting equipment, thereby improving the safety of the entire construction process. Measures such as installing a stator lifting angle plate on the top of the jack and hanging steel wire ropes on both sides of the rotor shaft provide additional protection for the lifting process and effectively reduce the occurrence of accidents. By cooperating with the lifting method, there is no need to bring in a large-load lifting equipment when the load of the on-site lifting equipment is insufficient, which can shorten the construction time, simplify the construction process, and reduce the construction investment, making the entire core pulling and core threading process smoother and more efficient. At the same time, it can ensure that the stator and rotor are evenly stressed during the lifting process, reducing equipment damage caused by excessive local stress.

[0037] 2. After the rotor and stator are completely separated, clean the stator and rotor, repair the burrs, and then use dough to inspect and clean the casing, bearing seat and other parts. The surface flatness can be understood by observing the contact surface between the dough and the casing, bearing, bearing seat and other parts. At the same time, the inspection cost of the casing, bearing, bearing seat and other parts can be effectively controlled.

[0038] 3. The large synchronous motor core pulling and core threading construction method of the present invention performs core pulling and core threading by overall lifting when the sausage hanger meets the lifting conditions, with high construction efficiency and low construction investment. At the same time, the core pulling is performed by supporting the core pulling, which has strong stability during construction and effectively reduces safety hazards during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the coordinating lifting process in step 3 of the core pulling and core threading construction method of a large synchronous motor of the present invention;

[0040] Figure 2 It is a schematic diagram of the process of adding a cushion block in step 3 of the core pulling and core threading construction method of a large synchronous motor of the present invention;

[0041] Figure 3 It is a schematic diagram of the core pulling detection process in step 4 of the core pulling and core threading construction method of a large synchronous motor of the present invention;

[0042] Figure 4 It is a schematic diagram of the large synchronous motor core pulling and core threading construction method of the present invention after placing the cushion block in step 4-1;

[0043] Figure 5 It is a schematic diagram of the stator lifting process in step 4-1 of the core pulling and core threading construction method of a large synchronous motor of the present invention;

[0044] Figure 6 It is a schematic diagram of the stator and rotor after they are completely separated in step 4-1 of the core pulling and core threading construction method of a large synchronous motor of the present invention.

[0045] In the figure:

[0046] 1-rotor, 2-stator, 3-hanging beam, 4-extension shaft, 5-motor seat, 6-jack, 7-lifting angle plate, 8-pad, 9-arc wood, 10-track wood, 11-stator placement tooling. DETAILED DESCRIPTION

[0047] The core pulling and core threading construction method of a large synchronous motor of the present invention is described in more detail below in conjunction with the embodiments.

[0048] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] Example 1

[0050] This embodiment discloses a construction method for core pulling and core threading of a large synchronous motor, which can reduce the investment cost of the lifting equipment for core pulling and core threading of a large synchronous motor, and reduce the maintenance hours and overall maintenance costs. It includes the following steps:

[0051] Step 1: Check the equipment, prepare the hanging beams, extension shafts, stator lifting angle plates and pads, lay the stator core pulling and core penetration and temporary rotor padding planks, and place the stator placement fixture.

[0052] In this embodiment, the hanging beam is a shoulder pole beam, the extension shaft is an extension shaft that can be adapted to be connected with the rotor shaft, the length of the rail is 2000 mm, and the width and height are 200 mm.

[0053] When pulling and threading the core of the motor rotor and stator, the stator and rotor can be lifted by the pre-prepared lifting beam and extension shaft. The stator lifting angle plate and rotor can be positioned and lifted by the pad. The stator can be positioned by the rail and stator placement tooling frame.

[0054] In order to realize the positioning and placement of the stator, the stator placement fixture includes a crossbeam and a column, the crossbeam specification is 20# H-shaped steel, the column specification is 20# channel steel, the column is symmetrically and vertically arranged on the top of the crossbeam, the column and the crossbeam are connected by angle steel, the angle steel specification is 10# angle steel, and an upper beam is arranged on the top of the column, and the upper beam is 20# channel steel. It has strong support and can prevent the stator from displacement.

[0055] Step 2: Disassemble the motor, remove the motor cooling pipes, hydraulic pipes, and lubrication pipes, and wrap the pipe openings to prevent foreign matter from entering.

[0056] Remove the instrument, control circuit, motor cooling and ventilation system. After removing the above components, remove the motor housing and remove the main shaft connection bolts using a hydraulic puller. Remove the bearing cover, mark it and measure the original top clearance and side clearance.

[0057] By removing the above-mentioned various devices, the rotor and stator of the motor are exposed, thereby preventing various devices from interfering with the core pulling and core threading process.

[0058] Step 3: To cooperate with the lifting, place at least two jacks on both sides of the stator, install the stator lifting angle plate at the corresponding jack top force point, hang the wire rope at the force points on both sides of the rotor shaft, hang the wire rope on the lifting beam to lift the rotor, and start the jack to lift the stator through the stator lifting angle plate while lifting the rotor, so that the stator and rotor are lifted synchronously.

[0059] It should be noted that the jack is a 50T jack, the steel wire rope is a DN60 steel wire rope, and the steel wire rope is perpendicular to the rotor axis and the suspension beam when under stress.

[0060] Lifting the stator and rotor with four 50T jacks in conjunction with a hoist can reduce the risk of tipping over when lifting the stator or rotor alone, and improve the safety of the entire construction process. Installing stator lifting angle plates on the top of the jacks and hanging steel wire ropes on both sides of the rotor shaft provide additional protection for the lifting process and effectively reduce the occurrence of accidents.

[0061] After the rotor and stator are synchronously lifted to the specified height, add pads on both sides of the stator to fix the stator height. After the stator height is fixed, connect the extended shaft with the rotor shaft.

[0062] The lifting method can shorten the construction time, simplify the construction process, and make the entire core pulling and core threading process smoother and more efficient. At the same time, it can ensure that the stator and rotor are evenly stressed during the lifting process, reducing equipment damage caused by excessive local stress.

[0063] Step 4: Core pulling test: After the stator is fixed, place a steel wire rope on one end of the rotor shaft and the extension shaft, and lift it along the axis of the rotor shaft. Lift the rotor coil to the outside of the stator and separate it from the stator. Then place the arc wood under the rotor to support the rotor. After support, test the upper motor rotor and complete the upper motor core pulling test.

[0064] In this step, the length of the arc wood is 2000 mm, the height is 200 mm, and the width is 180 mm. An arc groove is opened at the top of the middle position of the arc wood, and the depth of the arc groove is 100 mm. The arc wood with the groove at the top of the middle position can support the rotor and prevent damage to the rotor, which has strong protection and stability.

[0065] In addition, after the rotor and stator are completely separated, the stator and rotor are cleaned, and the removed housing, bearings, etc. are cleaned with cleaning oil and burrs are repaired. After cleaning, the housing, bearing seat and other parts are tested with dough and cleaned. When using dough to test it, the contact surface between the dough and the housing, bearing, bearing seat and other parts can be observed to understand the surface flatness, and the testing cost can be effectively controlled.

[0066] Step 5: After the core pulling test of the upper motor is completed, a steel wire rope is placed on one end of the rotor shaft and the extension shaft, and the rotor shaft is lifted horizontally along the axis of the rotor shaft. The arc wood is removed, and the coil of the rotor is lifted to the inside of the stator to complete the core pulling assembly, thereby completing the core pulling of the upper motor. After the core pulling is completed, the air gap of the rotor four axes is adjusted, and the magnetic center is aligned. The core pulling test steps and core pulling steps of the lower motor are the same as those of the upper motor.

[0067] When measuring the air gap, the measurement is completed by using an inclined gauge and a vernier caliper. Four points A, B, C, and D are taken along the corresponding positions of the inner wall of the stator, and the measurement is performed on the flat stator and rotor core. The average value Y of the air gap is obtained by measuring the value, and Y = (A + B + C + D) / 4. The allowable error value is ± 5% of the average value Y. If the air gap exceeds the error value, it can be completed by adjusting the pad at the bottom of the stator and moving the stator left and right.

[0068] After completing the air gap measurement and magnetic center alignment, measure the bearing side gap and top gap;

[0069] When measuring, first take out the bearing temperature thermometer, pour oil on the shaft diameter, and after oiling the journal, rotate and take out the lower bearing shell, confirm that the lower bearing alloy surface and ball seat surface are intact, and then install the lower bearing shell, and measure the side clearance of the bearing shell with a feeler gauge. The side clearance is 1 / 2 of the top clearance.

[0070] After adjusting the lower bearing shell, assemble the upper bearing shell and measure the clearance between the upper bearing shell and the journal by lead pressure. The allowable value of the top clearance of the journal is (1D-1.5D) / 1000, where D is the shaft diameter. After completing the measurement of the bearing shell side clearance and top clearance, assemble the bearing cover and adjust the oil seal clearance to complete the overall maintenance.

[0071] Example 2

[0072] Steps 1 to 2, air gap measurement, bearing clearance measurement, top gap measurement methods, and housing, bearing, and bearing seat cleaning and detection methods are the same as those in Example 1, and will not be described in detail here. The difference is that:

[0073] If the disassembled motor does not exceed the safe load-bearing capacity of the sling, proceed to step 3-1 to step 5-1.

[0074] Step 3-1: Lift as a whole, place the stator placement tooling on the laid rails, fix the wire rope of the lifting beam on the rotor shaft, lift the rotor together with the stator and lift them out of the motor installation pit, place them on the pre-installed stator placement tooling, and connect the extension shaft with the rotor shaft after placement.

[0075] The stator and rotor are positioned by means of the stator placement tool, thus ensuring stability during core pulling and core threading.

[0076] Step 4-1: Support the core pulling, complete the connection between the extension shaft and the rotor shaft, lift the rotor and stator again, place a cushion block at one end of the rotor shaft and the end of the extension shaft, and fix one end of the rotor shaft and the cushion block, and the end of the extension shaft and the cushion block to complete the placement and support of the stator and rotor.

[0077] Remove the wire rope, fix the wire rope to the lifting lug on the top of the stator, lift the stator, move it along the rotor axis toward the extension axis, stop lifting until the rotor completely exposes the coil, lower the stator, and complete the initial separation of the rotor and stator.

[0078] After the rotor and stator are initially separated, remove the wire rope, fix one side of the wire rope to the end of the rotor shaft, and fix the other side of the wire rope to the rotor shaft between the coil and the stator, lift the rotor, remove the pads at the end of the extension shaft and one end of the rotor shaft, and then translate the rotor along the axial direction of the rotor shaft. After the rotor is translated until it is completely separated from the stator, place an arc-shaped wood under the rotor to complete the support core pulling. After the support core pulling is completed, inspect the rotor and stator.

[0079] Step 5-1: Fix the wire rope on one side to the end of the rotor shaft and the wire rope on the other side to the rotor shaft on the coil side. Hang the top of the wire rope on the hanging beam, adjust the wire rope so that it is perpendicular to the rotor axis, lift the rotor and insert it into the stator.

[0080] After the rotor penetrates the stator to the wire rope on the side of the coil, stop inserting. At this time, one end of the rotor shaft extension shaft has passed through the stator. Place pads on one end of the rotor shaft and the end of the extension shaft, and fix one end of the rotor shaft and the pad, and the end of the extension shaft and the pad.

[0081] After the two ends of the rotor are padded, fix the steel wire rope on the side of the coil and the steel wire rope at one end of the rotor shaft to the lifting ears on the top of the stator, lift the stator, and when the stator axis coincides with the rotor shaft axis, translate the stator to allow the rotor coil to be inserted into the stator.

[0082] When the stator and rotor coils are completely overlapped, measure and adjust the air gap around the stator and rotor, drop the stator and pad it level with pads, and stuff red steel paper into the air gap around the stator.

[0083] Fix the wire rope on the rotor shaft and lift the rotor and stator at the same time, drop the stator onto the bottom plate, drop both ends of the rotor shaft into the bearing seat and align the magnetic center to complete the motor reinstallation.

[0084] It should be noted that the support core pulling steps and core threading and reinstallation steps for the upper motor and the lower motor are the same, so they will not be elaborated here.

[0085] Unless otherwise defined, technical or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs.

[0086] The exemplary implementation modes of the present invention are described in detail above with reference to the preferred embodiments. The protection scope of the present invention is not limited thereto. It can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various combinations of the various technical features proposed in the present invention can be made without exceeding the protection scope of the present invention.

Claims

1. A core pulling and core threading construction method for a large synchronous motor, characterized in that: The steps include: Step 1: Check the equipment, prepare the hanging beam, extension shaft, stator lifting angle plate and pad, lay the stator core pulling and core passing and temporary rotor padding planks, and place the stator placement tooling frame; Step 2: Disassemble the motor, remove the motor cooling pipeline, hydraulic pipeline, and lubrication pipeline, and wrap the pipe openings to prevent foreign matter from entering; Remove the instruments, control circuits, motor cooling and ventilation systems; After the above components are removed, remove the motor housing and remove the main shaft connection bolts using a hydraulic puller; Remove the bearing cover, mark it and measure the original top clearance and side clearance; If the disassembled motor exceeds the safe load of the sling, go to step 3 to step 5; if it does not exceed the safe load of the sling, go to step 3-1 to step 5-1; Step 3: To cooperate with the lifting, place at least two jacks on both sides of the stator, install stator lifting angle plates at the corresponding jack tops, hang steel wire ropes at the points where the rotor shaft can be used, hang the steel wire ropes on the lifting beam to lift the rotor, and start the jacks to lift the stator through the stator lifting angle plates while the rotor is lifted, so that the stator and rotor are lifted synchronously; After the rotor and stator are synchronously lifted to the specified height, add pads on both sides of the stator to fix the stator height. After the stator height is fixed, connect the extension shaft with the rotor shaft; Step 4: Core pulling test: After the stator is fixed, a steel wire rope is placed on one end of the rotor shaft and the extension shaft, and the rotor is lifted horizontally along the axial direction of the rotor shaft. The rotor coil is lifted to the outside of the stator and separated from the stator. Then, an arc-shaped wood is placed under the rotor to support the rotor. After support, the upper motor rotor is tested to complete the upper motor core pulling test; Step 5: After the core pulling test of the upper motor is completed, a steel wire rope is placed on one end of the rotor shaft and the extension shaft, and the rotor shaft is lifted horizontally along the axis of the rotor shaft. The arc wood is removed, and the coil of the rotor is lifted to the inside of the stator to complete the core pulling assembly, thereby completing the core pulling of the upper motor. After the core pulling is completed, the air gap of the rotor four axes is adjusted, and the magnetic center is aligned. The core pulling test steps and core pulling steps of the lower motor are the same as those of the upper motor; Step 3-1: Lift the whole body, place the stator placement tooling on the laid rails, fix the steel wire rope of the lifting beam on the rotor shaft, lift the rotor together with the stator and lift them out of the motor installation pit, and place them on the pre-installed stator placement tooling after placement, and then connect the extension shaft with the rotor shaft; Step 4-1: Support the core pulling, complete the docking of the extension shaft and the rotor shaft, lift the rotor and stator again, place a cushion block at one end of the rotor shaft and the end of the extension shaft, and fix one end of the rotor shaft and the cushion block, and the end of the extension shaft and the cushion block to complete the placement and support of the stator and rotor; Remove the wire rope, fix the wire rope to the lifting lug on the top of the stator, lift the stator, move along the rotor axis toward the extension axis, stop lifting until the rotor completely exposes the coil, put down the stator, and complete the initial separation of the rotor and stator; After the rotor and stator are initially separated, remove the wire rope, fix one side of the wire rope to the end of the rotor shaft, and fix the other side of the wire rope to the rotor shaft between the coil and the stator, lift the rotor, remove the pads at the end of the extension shaft and one end of the rotor shaft, and then translate the rotor along the rotor shaft axis. After the rotor is translated until it is completely separated from the stator, place an arc wood under the rotor to complete the support core pulling. After the support core pulling is completed, inspect the rotor and stator; Step 5-1: After core insertion, fix the wire rope on one side to the end of the rotor shaft and the wire rope on the other side to the rotor shaft on the coil side. Hang the top of the wire rope on the hanging beam, adjust the wire rope so that it is perpendicular to the rotor axis, lift the rotor and insert the rotor into the stator. After the rotor penetrates the stator to the wire rope at the side of the coil, stop penetrating. At this time, one end of the rotor shaft installation extension shaft has penetrated the stator. Place a cushion block on the end of the rotor shaft and the end of the extension shaft, and fix one end of the rotor shaft and the cushion block, and the end of the extension shaft and the cushion block; After the two ends of the rotor are padded, fix the steel wire rope on the side of the coil and the steel wire rope at one end of the rotor shaft to the lifting lugs on the top of the stator, lift the stator, and when the stator axis coincides with the rotor axis, translate the stator to allow the rotor coil to penetrate into the stator. When the stator and rotor coils are completely overlapped, adjust the air gap around the stator and rotor, drop the stator and use pads to level the stator; stuff red steel paper into the air gap around the stator; Fix the wire rope on the rotor shaft and lift the rotor and stator at the same time, drop the stator on the bottom plate, drop both ends of the rotor shaft into the bearing seat and align the magnetic center to complete the motor reinstallation; The support core pulling steps and core threading and reinstallation steps of the upper motor and the lower motor are the same.

2. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: The hanging beam in step 1 is a shoulder pole beam, the extension shaft is an extension shaft that can be adapted to be connected with the rotor shaft, and the rail has a length of 2000 mm and a width and height of 200 mm.

3. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: The stator placement tooling frame in step 1 includes a crossbeam and a column. The crossbeam is 20# H-shaped steel, and the column is 20# channel steel. The columns are symmetrically and vertically arranged on the top of the crossbeam. The columns and the crossbeam are connected by angle steels. The angle steel is 10# angle steel. An upper beam is arranged on the top of the column, and the upper beam is 20# channel steel.

4. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: The jack in step 3 is a 50T jack, the steel wire rope is a DN60 steel wire rope, and the steel wire rope is perpendicular to the rotor axis and the suspension beam when under stress.

5. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: The length of the arc-shaped wood in step 4 and step 4-1 is 2000 mm, the height is 200 mm, and the width is 180 mm. An arc-shaped groove is opened at the top of the middle position of the arc-shaped wood, and the depth of the arc-shaped groove is 100 mm.

6. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: The air gap in step 5 and step 5-1 is measured by an inclined gauge and a vernier caliper. Four points A, B, C, and D are respectively taken along the corresponding positions of the inner wall of the stator, and the measurement is performed on a flat stator and rotor core. The average value Y of the air gap is calculated by measuring the values ​​of each point. The Y=(A+B+C+D) / 4, and the allowable error value is ±5% of the average value Y. The air gap is achieved by adjusting the pad at the bottom of the stator and moving the stator left and right.

7. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: After the air gap is adjusted and the magnetic center is aligned, the bearing side gap and top gap are measured; When measuring, first take out the bearing temperature thermometer, pour oil on the shaft diameter, and after pouring oil on the journal, rotate and take out the lower bearing shell, confirm that the lower bearing alloy surface and ball seat surface are intact, then install the lower bearing shell, and measure the side clearance of the bearing shell with a feeler gauge. The side clearance is 1 / 2 of the top clearance. After adjusting the lower bearing shell, assemble the upper bearing shell and measure the clearance between the upper bearing shell and the journal by lead pressure. The allowable value of the top clearance of the journal is (1D-1.5D) / 1000, where D is the shaft diameter. After completing the measurement of the bearing shell side clearance and top clearance, assemble the bearing cover and adjust the oil seal clearance.

8. A large synchronous motor core pulling and core threading construction method as claimed in claim 1, characterized in that: After the rotor and stator are completely separated, the stator and rotor are cleaned. At the same time, the dismantled casing, bearings, etc. are cleaned with cleaning oil and burrs are repaired. After cleaning, the dough is tested and the casing, bearing seat and other parts are cleaned.

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