Generator tray type stator hot jacket hanger and use method thereof

Abstract

The invention relates to the technical field of stator hot jacket lifting appliances, and provides a generator tray type stator hot jacket lifting appliance and a use method, and an external expansion lifting plate in the hot jacket lifting appliance comprises a plurality of first through holes matched and connected with a stator iron core, at least one first threaded hole and at least one second threaded hole; the bottom hoisting structure comprises a tray, a supporting rod and a thickened gasket, the upper end of the supporting rod is connected with the stator core, and the lower end of the supporting rod penetrates through the thickened gasket and is fixed on the tray; the negative pressure L plate is connected with a threaded hole in the bottom of the machine base through a screw rod; initial hoisting of the stator iron core is achieved through cooperation of the externally-expanded hoisting plate and the cross-shaped hoisting beam, and bottom hoisting of the stator iron core is completed through assembly of the supporting rod and the tray. According to the invention, the purpose of completing the stator shrinkage fit operation from bottom hoisting is achieved, meanwhile, the technical problem of maintaining the negative pressure of the stator after shrinkage fit is solved, it is ensured that the base and the stator iron core are tightly attached in the axial direction without gaps, and the collision damage to the stator coil in the shrinkage fit process can be effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of stator hot - sleeve lifting tools, and particularly relates to a generator tray - type stator hot - sleeve lifting tool and a using method thereof. Background Technique

[0002] Currently, our company has successfully developed a motor with a new cooling method. The stator structure of this motor is special, and pipelines are arranged at both the lead end and the non - lead end. This makes it impossible to directly install a suspension rod at the lead end of the stator clamping ring and then hot - sleeve and lift the stator core, because the lifting hole at the lead end of the stator is completely blocked by the pipeline. In view of this, it is only possible to perform the lifting operation from the non - lead end. However, there are problems with the non - lead end, such as a relatively long axial height and a relatively large distance between the bottom and the center of gravity of the stator.

[0003] In the prior art field, for example, in the patented technology with the publication number CN206872263U and the name "Disc - type Simple Lifting Tool", it is welded by two plates and directly contacts the components during lifting. However, this lifting tool has obvious technical drawbacks: on the one hand, it is only applicable to lifting components with a relatively small diameter; on the other hand, its application scenario is limited to the case where the lifted parts can be completely fitted with the lifting tool, and it is difficult to meet the lifting requirements for components with a large diameter, which need to be lifted from the bottom and there is a certain axial distance between the stator and the lifting tool.

[0004] In addition, in the patent with the publication number CN212403192U and the name "An Assembled and Adjustable Tray - type Lifting Tool", it includes multiple lifting arm components, a lifting tool ear, and a lifting ear support plate. The center of the lifting tool ear and the lifting ear support plate are detachably connected, and the lifting ear support plate is respectively connected to multiple lifting arm components. The lifting arm components also include a main structural plate, an auxiliary adjustment plate, and a support plate, and the angles between the plates can be adjusted through a specific hinged method. Although this lifting tool belongs to the bottom - lifting type, its technical solution is designed specifically for bearing lifting, directly contacts the bearing, and due to the adoption of a Y - type structure, the lifting load is limited, and it is also not suitable for the lifting scenario of a stator core with a large diameter, large weight, and a large axial length between the stator and the lifting tool.

[0005] For the current semi - direct - drive motor of our company, the lifting hole at the upper end of the axial space of the stator core is completely blocked, and it is impossible to directly install a suspension rod to complete the lifting task. Even if an attempt is made to install a movable lifting tool at the lead end, it will interfere with the axial machine base and accessories. The process holes at the non - lead end (i.e., the bottom of the core) of the stator core have been fixedly installed with accessories. At the same time, the coil noses at the upper and lower ends of the core occupy a certain axial space of the stator core, resulting in the complete blockage of the axial direction of the upper - end lifting hole of the stator core. Although the axial direction of the lower - end lifting hole is not completely blocked, some process holes have been occupied and the lower - end lifting hole is at a relatively long distance from the non - lead end.

[0006] In summary, there is an urgent need for a special lifting tool at present, which can not only overcome the problem that the upper end of the stator core cannot be lifted, realize lifting from the bottom to complete the stator hot sleeve process, but also ensure the negative pressure of the stator after the hot sleeve, and ensure that there is no axial clearance between the frame and the stator core. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a generator tray-type stator hot sleeve lifting tool, which solves the problem that the upper end of the stator core cannot be lifted due to structural or working condition limitations. By designing a special lifting tool, the purpose of completing the stator hot sleeve operation by lifting from the bottom is realized; at the same time, the technical problem of maintaining the negative pressure of the stator after the hot sleeve is overcome, and it is ensured that the frame and the stator core are closely fitted axially and there is no clearance.

[0008] On the one hand, a generator tray-type stator hot sleeve lifting tool provided by the present invention includes:

[0009] An outwardly expanding lifting plate: including a plurality of first through holes that are matingly connected to the stator core, at least one first threaded hole, and at least one second threaded hole;

[0010] A bottom lifting structure: including a tray, a support rod, and a thickening washer. The upper end of the support rod is connected to the stator core, and its lower end passes through the thickening washer and is fixed on the tray;

[0011] A negative pressure L plate: connected to the threaded hole at the bottom of the frame through a screw;

[0012] The lifting tool realizes the initial lifting of the stator core through the cooperation of the outwardly expanding lifting plate and the cross lifting beam. The assembly of the support rod and the tray completes the bottom lifting of the stator core, and the negative pressure L plate enables the stator core and the frame to be axially and gaplessly fitted after the hot sleeve.

[0013] Further, the outwardly expanding lifting plate is of a triangular structure, and multiple groups are arranged along the circumferential direction of the upper end face of the stator core.

[0014] Further, the first threaded hole is opened at the top of the triangular structure for installing the first lifting ring screw; the second threaded hole is opened at the geometric center of the triangular structure for assisting in hole positioning; the first through hole is opened at the bottom of the triangular structure and is detachably connected to the upper end face of the stator core.

[0015] Further, the load that the first lifting ring screw can bear is greater than the sum of the weights of the stator core and the tooling.

[0016] Further, the tray is of a hollow circular ring structure, and a plurality of outer circle through holes are evenly distributed on the outer circle, and the outer circle through holes are consistent with the bottom mounting holes of the stator core; a plurality of middle threaded holes are evenly distributed on the middle circle for connecting with the negative pressure L plate; a plurality of groups of inner circle threaded holes are evenly distributed on the inner circle for installing the second lifting ring screw.

[0017] Further, the support rod has a threaded structure at both ends and a smooth rod structure in the middle section. The diameter of the smooth rod structure is larger than that of the threaded structure. The upper threaded structure is threadedly connected to the stator core, and the length of the threaded structure is less than or equal to the thread depth of the stator core.

[0018] Further, the inner diameter of the thickened washer is larger than the diameter of the threaded structure of the support rod and smaller than the outer diameter of the smooth rod structure of the support rod.

[0019] Further, a plurality of groups of negative pressure L plates are evenly installed along the circumferential direction of the bottom of the machine base. A long through hole and a single-hole are provided on the negative pressure L plate.

[0020] Further, it further includes a plurality of connecting plates fixedly arranged evenly along the circumferential direction of the upper end surface of the stator core. Two rows of through holes are provided on the connecting plates. Among them, the innermost row of through holes is used for threaded connection with the upper end of the stator core, and the through holes on the outer side are in clearance fit with the smooth rod section of the guide rod. The threaded section of the guide rod is screwed into the corresponding threaded hole of the machine base, so that the stator core and the machine base form circumferential positioning.

[0021] On the other hand, the present invention also provides a use method of a generator tray-type stator hot sleeve lifting tool, including the following steps:

[0022] Step 1: Uniformly install the outer expansion lifting plate on the upper end of the stator core through the first through holes and screw the first lifting ring screw into the first threaded hole;

[0023] Step 2: Initially use a cross lifting beam to connect the lifting ring screws on the outer expansion lifting plate during hoisting, and lift the stator core to a certain height above the ground;

[0024] Step 3: Threadedly connect the upper end of the support rod to the bottom of the stator core, place the tray on the support platform, and align the lower end of the support rod with the outer circular through hole of the tray through the thickened washer and pre-tighten and fix it with a nut;

[0025] Step 4: Remove the outer expansion lifting plate and install the connecting plate. Through the second lifting ring screw fixed on the tray, use a cross lifting beam to lift the stator core and the bottom lifting structure above the machine base, then sleeve it into the heated machine base and connect and align it with the guide rod;

[0026] Step 5: Install the negative pressure L plate at the bottom of the machine base, connect the negative pressure L plate to the tray through bolts, after completing torque tightening, apply negative pressure to the stator core, and remove the negative pressure L plate and the bottom lifting structure after cooling.

[0027] The present invention has the following advantages compared with the prior art:

[0028] 1. The present invention adopts a method of hoisting the stator core coil assembly from the bottom, which solves the problem of interference of the top-mounted suspension rod and also solves the problem that the traditional hoisting method cannot be used due to structural changes caused by other cooling methods.

[0029] 2. The present invention borrows the structure of the hoisting tooling, installs a negative pressure L plate at the bottom of the machine base, and solves the problem of maintaining negative pressure after hot shrinking.

[0030] 3. In the sling of the present invention, the tray adopts a hollow ring structure, which greatly reduces the weight of the tooling while ensuring the hoisting strength. There is a certain gap between the mating spigot of the tray and the machine base, and there will be no interference with the machine base during the hot shrinking process.

[0031] 4. The sling of the present invention adopts a modular assembly structure, which has the advantages of light overall weight, simple structure, high structural strength, convenient installation and disassembly, and is suitable for repeated use.

[0032] 5. The sling of the present invention can effectively avoid the collision between the lower coil of the stator core coil assembly and the machine base during the hot shrinking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and form a part of the specification, and are used together with the specification to explain the principles of the present invention.

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic diagram of the initial hoisting of the present invention using a cross hoisting beam to connect the lifting ring screws on the outward-expanded lifting plate and then installing the bottom hoisting structure.

[0036] Figure 2 It is a schematic diagram of the structure of the bottom hoisting structure of the present invention connecting the stator core.

[0037] Figure 3 It is a schematic diagram of the connection of some structures during the negative pressure operation of the stator of the present invention.

[0038] Figure 4 It is a schematic diagram of the outward-expanded lifting plate of the present invention.

[0039] Figure 5 It is a schematic diagram of the negative pressure L plate of the present invention.

[0040] Figure 6 It is a schematic top view of the tray of the present invention.

[0041] Wherein: 1 - outward expansion hanging plate; 11 - first threaded hole; 12 - second threaded hole; 13 - first through hole; 2 - bottom hoisting structure; 21 - support rod; 22 - tray; 23 - thickened washer; 221 - outer circular through hole; 222 - middle threaded hole; 223 - inner ring threaded hole; 3 - negative pressure L-shaped plate; 31 - long through hole; 32 - single-hole; 4 - connecting plate; 5 - machine base. Detailed implementation manners

[0042] The following will describe the implementation schemes of the present invention in detail in conjunction with the embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0043] According to the embodiments of the present invention, in combination with the attached Figure 1-6 As shown, the present invention provides a generator tray-type stator hot sleeve hoist, mainly including: an outward expansion hanging plate 1, a bottom hoisting structure 2, and a negative pressure L-shaped plate 3. Among them, the bottom hoisting structure 2 includes a tray 22, a support rod 21, and a thickened washer 23. The outward expansion hanging plate 1 is installed at the upper end of the stator core, and cooperates with the cross hanging beam to lift the stator core. Then, multiple groups of support rods 21 are evenly installed at the bottom of the stator core. A thickened washer 23 is installed between the support rod 21 and the tray 22. After being sleeved into the tray 22, it is fastened with bolts. Then, the outward expansion hanging plate 1 is removed, and the tray 22 is hoisted to lift the stator core. It is sleeved into the machine base 5, and then the negative pressure L-shaped plate 3 is installed to ensure that the stator core is axially completely attached to the machine base 5.

[0044] According to the embodiments of the present invention, the outward expansion hanging plate 1 in the present invention has a triangular structure, and multiple groups are arranged along the circumferential direction of the upper end face of the stator core, preferably set to 4 groups, and can cooperate with the cross hanging beam for hoisting. The purpose of setting the triangular structure: First, the radial lifting points are expanded; second, the triangle has good stability, and the structure weight is designed to be the lightest on the premise of meeting the expansion of the lifting points. There are multiple first through holes 13 that are matched and connected with the stator core, at least one first threaded hole 11, and at least one second threaded hole 12 on the outward expansion hanging plate 1. Among them, the first threaded hole 11 is opened at the top of the triangular structure for installing the first lifting ring screw; the second threaded hole 12 is opened at the geometric center of the triangular structure for assisting in hole positioning; the first through hole 13 is opened at the bottom of the triangular structure and is detachably connected to the upper end face of the stator core, and threaded bolt connection or other detachable connections can be carried out through the first through hole 13.

[0045] According to the embodiments of the present invention, the installation of the outward expansion hanging plate 1 is applicable to both uniform distribution and non-uniform distribution. Four groups of uniform distribution can directly use the adjustable stator hoist to cooperate to complete the hoisting.

[0046] According to the embodiments of the present invention, the load that the first lifting ring screw can bear is greater than the sum of the weights of the stator core and the tooling.

[0047] According to an embodiment of the present invention, the bottom lifting structure 2 includes a tray 22, a support rod 21, and a thickening washer 23. The upper end of the support rod 21 is connected to the stator core, and its lower end passes through the thickening washer 23 and is fixed on the tray 22. Among them, the tray 22 is a hollow circular ring structure, with a plurality of outer circle through holes 221 evenly distributed on the outer circle, a plurality of middle threaded holes 222 evenly distributed on the middle circle, and 4 groups of inner circle threaded holes 223 evenly arranged on the inner circle. The outer circle through holes 221 on the outer circle pitch circle are consistent with the bottom mounting holes of the stator core, and the tray 22 and the stator core are connected and fixed through the support rod 21; a plurality of middle threaded holes 222 evenly distributed on the middle pitch circle are connected to the single holes 32 on the negative pressure L plate 3; the inner circle threaded holes 223 are used to install the matching second lifting ring screws. The support rod 21 has a threaded structure at both ends and a smooth rod structure in the middle section. The diameter of the smooth rod structure is larger than that of the threaded structure. The upper threaded structure is threadedly connected to the stator core, and the length of the threaded structure is less than or equal to the thread depth of the stator core. The support rod 21 is integrally heat treated to obtain good comprehensive mechanical properties and increase hardness. A clamping groove is provided near the lower end of the support rod 21 for wrench tightening installation or disassembly. The inner diameter of the thickening washer 23 is larger than the threaded structure diameter of the support rod 21 and smaller than the outer diameter of the smooth rod structure of the support rod 21, which is used to increase the force bearing area of the support rod.

[0048] According to an embodiment of the present invention, multiple groups of negative pressure L plates 3 are evenly installed along the circumferential direction of the bottom of the machine base, and the bent side faces the inner circle of the stator core. Through bolt pre-tightening, the stator core is pulled downward to ensure that there is no gap after the axial shrink fit of the stator core and the machine base 5. A long through hole 31 and a single hole 32 are provided on the negative pressure L plate 3. The single hole 32 is threadedly connected to the middle threaded hole 222 on the tray 22; it is connected and fixed to the threaded hole at the bottom of the machine base 5 through an extended screw rod. 4 to 8 groups are evenly installed in the circumferential direction of the bottom of the machine base 5, and the torque value is 200 to 300 N·m. The setting of the negative pressure L plate 3 ensures that the axial mating stop of the machine base 5 and the stator core is completely fitted. The purpose of setting the single hole 32 in the present invention is that after the machine base is heated, it expands, and during the cooling process of the shrink fit, the radial relative distance between the machine base and the stator core becomes smaller. The single hole 32 is used to make up for the shrinking process stroke. If it is set as a through hole, interference may occur during the cooling process. The support rod 21 is connected and fixed to the tray 22, and the stator core and the bottom lifting structure 2 can be regarded as a whole. When the tray 22 is stressed downward, it will pull the stator core downward.

[0049] According to an embodiment of the present invention, it further includes a plurality of connecting plates 4 that are evenly and detachably fixedly connected along the circumferential direction of the upper end face of the stator core, and there can be 4 to 8; two rows of through holes are provided on the connecting plate 4. Among them, the innermost row of through holes is used for threaded connection with the upper end of the stator core, and the outer through holes form a small clearance fit with the smooth rod section of the guide rod. The threaded section of the guide rod is screwed into the corresponding threaded hole of the machine base 5 to form circumferential positioning between the stator core and the machine base 5.

[0050] According to an embodiment of the present invention, the stator assembly of the present invention mainly includes a stator frame and a stator core coil assembly; the stator core coil assembly mainly includes accessories such as a stator core, coils, and cooling pipelines; hoisting process holes are provided at both the upper and lower ends of the stator core. However, the hoisting process hole at the upper end (lead end) of the stator core is axially blocked by the cooling pipeline, and it is impossible to directly install a suspension rod at the upper end of the stator core to complete the hoisting of the stator core as in the previous traditional structure; moreover, the distribution of the process holes at the upper end of some structures is uneven, making hoisting somewhat difficult; the stator core and the frame are in interference fit, and the frame 5 is provided with a boss for positioning the stator core stop. After hot sleeving, a plurality of connecting plates 4 are installed on the upper plane of the stator core. There are two groups of through holes on the connecting plate 4, one group is connected to the stator core, and one group is connected to the frame 5. During hot sleeving, the connecting plate 4 is used for alignment to ensure that the directions of the stator core and the frame are relatively correct after hot sleeving.

[0051] According to an embodiment of the present invention, a method for using a tray-type stator hot-sleeving lifting tool for a generator provided by the present invention includes the following steps:

[0052] Step 1: Uniformly install the outward-expanding lifting plate 1 on the upper end of the stator core through the first through holes 13 and screw the first lifting ring screw into the first threaded hole 11.

[0053] Step 2: Initially use a cross lifting beam to connect the first lifting ring screws on the outward-expanding lifting plate 1 and lift the stator core to a height of 1-2 m above the ground for installing the bottom lifting structure 2.

[0054] Step 3: Threadedly connect the upper end of the support rod 21 to the bottom of the stator core. Place the tray 22 on the support platform. The lower end of the support rod 21 passes through the thickened washer 23 and aligns with the outer circular through hole 221 of the tray 22 and is pre-tightened and fixed with a nut.

[0055] Step 4: Remove the outward-expanding lifting plate 1 and install the connecting plate 4. Through the second lifting ring screws fixed on the tray 21, use a cross lifting beam to lift the stator core and the bottom lifting structure 2 above the frame 5 and then sleeved into the heated frame 5 and connect and align with a guiding rod;

[0056] Step 5: Install the negative pressure L-shaped plate 3 at the bottom of the frame 5. Connect the negative pressure L-shaped plate 3 to the tray 21 through bolts. After completing torque tightening, apply negative pressure to the stator core and remove the negative pressure L-shaped plate 3 and the bottom lifting structure 2 after cooling.

[0057] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A generator tray-type stator hot-sleeved lifting tool, characterized in that Comprising: Outward-expanding suspension plate (1): including a plurality of first through holes (13) that are matingly connected to the stator core, at least one first threaded hole (11), and at least one second threaded hole (12); Bottom hoisting structure (2): including a tray (22), a support rod (21), and a thickening washer (23), the upper end of the support rod (21) is connected to the stator core, and its lower end passes through the thickening washer (23) and is fixed to the tray (22); Negative pressure L-shaped plate (3): connected to the threaded hole at the bottom of the machine base through a screw; The lifting tool realizes the initial hoisting of the stator core through the cooperation of the outward-expanding suspension plate (1) and the cross lifting beam, the assembly of the support rod (21) and the tray (22) completes the bottom lifting and transportation of the stator core, and the negative pressure L-shaped plate (3) enables the stator core to be axially and gaplessly fitted after hot sleeving with the machine base (5).

2. The generator tray-type stator hot sleeve lifting tool according to claim 1, characterized in that The outward-expanding suspension plate (1) is of a triangular structure and is provided with multiple groups along the circumferential direction of the upper end face of the stator core.

3. The generator tray-type stator hot-sheathing lifting tool according to claim 2, characterized in that The first threaded hole (11) is opened at the top of the triangular structure for installing the first lifting ring screw; the second threaded hole (12) is opened at the geometric center of the triangular structure for assisting in hole positioning; the first through hole (13) is opened at the bottom of the triangular structure and is detachably connected to the upper end face of the stator core.

4. The generator tray-type stator hot-sheathing lifting tool according to claim 3, characterized in that, The load that the first lifting ring screw can bear is greater than the sum of the weights of the stator core and the tooling.

5. The generator tray-type stator hot-sheathing lifting tool according to claim 1, wherein The tray (22) is of a hollow circular ring structure, and a plurality of outer circle through holes (221) are evenly distributed on the outer circle, and the outer circle through holes (221) are consistent with the bottom mounting holes of the stator core; a plurality of middle threaded holes (222) are evenly distributed on the middle circle for connecting with the negative pressure L-shaped plate (3); a plurality of groups of inner circle threaded holes (222) are evenly distributed on the inner circle for installing the second lifting ring screw.

6. The generator tray-type stator hot-sheathing lifting tool according to claim 1, wherein The support rod (21) has a threaded structure at both ends and a smooth rod structure in the middle section, the diameter of the smooth rod structure is larger than the diameter of the threaded structure, and the length of the threaded structure at the upper end is threadedly connected to the stator core and is less than or equal to the threaded depth of the stator core.

7. The generator tray-type stator hot sleeve lifting tool according to claim 1, characterized in that, The inner diameter of the thickening washer (23) is larger than the diameter of the threaded structure of the support rod (21) and smaller than the outer diameter of the smooth rod structure of the support rod (21).

8. The generator tray-type stator hot-sheathing lifting tool according to claim 1, characterized in that A plurality of groups of the negative pressure L-shaped plates (3) are evenly installed along the circumferential direction of the bottom of the machine base (5), and a long through hole (31) and a single-hole (32) are opened on the negative pressure L-shaped plate (3).

9. The generator tray type stator hot sleeve lifting tool according to claim 1, wherein, It further includes a plurality of connecting plates (4) evenly fixed along the circumferential direction of the upper end face of the stator core. Two rows of through holes are provided on the connecting plate (4). Among them, the innermost row of through holes is used for threaded connection with the upper end of the stator core, and the through holes on the outer side are in clearance fit with the smooth rod section of the guide rod. The threaded section of the guide rod is screwed into the corresponding threaded hole of the machine base (5) to form circumferential positioning between the stator core and the machine base (5).

10. A method for using the generator tray-type stator hot sleeve lifting tool according to any one of claims 1-9, characterized in that, Including the following steps: Step 1: Evenly install the outward-expanding suspension plate (1) on the upper end of the stator core through the first through holes (13) and screw the first lifting ring screw into the first threaded hole (11); Step 2: For initial hoisting, use a cross lifting beam to connect the lifting ring screws on the outward-expanding suspension plate (1) and lift the stator core to a certain height above the ground; Step 3: Thread-connect the upper end of the support rod (21) to the bottom of the stator core. Place the tray (22) on the support platform. Align the lower end of the support rod (21) with the outer circular through-hole (221) of the tray (22) after passing through the thickening washer (23), and fix it in a pre-tightened manner with a nut. Step 4: Remove the outward-expanding lifting plate (1) and install the connecting plate (4). After lifting the stator core and the bottom lifting structure (2) to directly above the machine base (5) by using the cross lifting beam through the second lifting ring screw fixed on the tray (21), sleeve it into the heated machine base (5) and connect and align it with the guide rod. Step 5: Install the negative pressure L-shaped plate (3) at the bottom of the machine base (5). Connect the negative pressure L-shaped plate (3) to the tray (21) with bolts. After completing the torque fastening, apply negative pressure to the stator core, and remove the negative pressure L-shaped plate (3) and the bottom lifting structure (2) after cooling.

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