A telescopic high-voltage motor rotor extraction method and a dummy shaft tool

Abstract

The present invention belongs to the technical field of motor maintenance, and specifically relates to a telescopic high-voltage motor rotor extraction method and a dummy shaft tool. The method first removes the couplings between the motor and the pump, and between the motor and the fan; connects the coupling A or the adjustable coupling A to the motor rotor shaft; installs the non-drive end dummy shaft on the rotor shaft; pulls the rotor, and installs the adjustable dummy shaft on the coupling A or the adjustable coupling A; continues to pull the rotor, and installs the segmented adjustable dummy shaft piece by piece until the rotor is completely pulled out. The dummy shaft tool includes a plurality of adjustable dummy shafts that can be connected at the end, and a connecting structure connected to the rotor, and the connecting structure is fixed to the adjustable dummy shaft at the end. The dummy shaft required for the rotor extraction work is made telescopic, which is suitable for the rotor extraction work in the motor maintenance workshop, and is also suitable for the rotor extraction work using dummy shafts in the narrow space of the motor work site, solving the problem of no available dummy shafts for rotor extraction on site.

Description

Technical Field

[0001] The invention belongs to the technical field of motor maintenance, and in particular relates to a telescopic high-voltage motor rotor extraction method and a dummy shaft tool. Background Art

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its primary function is to generate driving torque. As a power source for electrical appliances and various machines, it is widely used in various industrial fields and is one of the most widely used electrical equipment. High-voltage motors generally refer to medium-to-large electric motors with voltage levels of 6kV and above. They are generally large in size, weight, and power.

[0003] High-voltage motors require regular preventive maintenance, and rotor removal and disassembly is a key step in this process. Research indicates that the current "dummy shaft rotor removal" method used in the industry often requires the use of pre-made dummy shafts of varying specifications depending on the type of motor. This method presents the following issues:

[0004] (1) Different models of high-voltage motor rotors have different shaft diameters and motor lengths. Whole stainless steel (or carbon steel) pipes of different specifications and lengths are often used as dummy shafts. This leads to problems such as a large number of finished dummy shafts, large storage space, and high maintenance costs.

[0005] (2) The motor backrest wheel must be removed before the rotor can be disassembled for inspection. This work involves on-site hot work, and frequent disassembly poses a safety hazard of equipment damage and personnel burns.

[0006] (3) The clearance between the finished dummy shaft and the shaft diameter is generally relatively large, which poses a greater risk of scratching the shaft diameter during use;

[0007] (4) The clearance between the finished dummy shaft and the shaft diameter is generally relatively large. During use, there is a problem of downward tilt of the motor rotor shaft system. During the process of pulling out the rotor, it is easy to cause damage to the motor stator and rotor, and there is a hidden danger of the rotor slipping, which poses a high risk of equipment damage. Summary of the Invention

[0008] The purpose of the present invention is to provide a telescopic high-voltage motor rotor extraction method and a dummy shaft tool, which can be used for different types of high-voltage motors and can achieve reliable connection with the rotor of the motor to be repaired.

[0009] The technical solutions of the present invention are as follows:

[0010] A method for withdrawing a rotor of a telescopic high-voltage motor comprises the following steps:

[0011] Step 1: Remove the couplings between the motor and the pump, and between the motor and the fan;

[0012] Step 2: Connect the coupling A or the adjustable coupling A to the motor rotor shaft;

[0013] Step 3: Install the non-drive end dummy shaft on the rotor shaft;

[0014] Step 4: Pull the rotor and install the adjustable dummy shaft on the coupling A or the adjustable coupling A;

[0015] Step 5: Continue pulling the rotor and install the segmented adjustable dummy shaft piece by piece until the rotor is completely pulled out;

[0016] Step 6: After the motor stator and rotor inspection is completed, remove the components in steps 1-5.

[0017] When the motor rotor shaft diameter is large, the specific steps are:

[0018] Step 1: Remove the couplings between the motor and pump, and between the motor and fan;

[0019] Step 2: Connect coupling A to the motor rotor shaft;

[0020] Step 3: The non-drive end dummy shaft structure is a coupling B. The coupling B is placed on the rotor shaft diameter and fixed axially to the motor rotor through the axial mounting hole A using the motor's own bolts;

[0021] Step 4: Pull the rotor and install the adjustable dummy shaft on coupling A;

[0022] Step 5: After connecting the adjustable dummy shaft to coupling A, secure it with the anti-dropout pin. Connect multiple adjustable dummy shafts and secure them with the anti-dropout pins until the rotor is completely pulled out.

[0023] Step 6: After the motor stator and rotor inspection is completed, remove the components in steps 1-5.

[0024] The coupling A comprises a coaxially mounted butt sleeve A, a main sleeve A and a connecting flange, wherein the butt sleeve A is welded to one end of the main sleeve A, and the other end of the main sleeve A is welded to the connecting flange.

[0025] The middle of the connecting flange is processed with a mounting hole for welding the main shaft sleeve A, and four coupling docking holes A are provided in the circumferential direction for connection with the motor rotor.

[0026] A mounting hole A is machined on the side walls of the butt sleeve A and the main sleeve A for installing an anti-dropout pin, which is inserted into the coupling A.

[0027] When the motor rotor shaft diameter is small, the specific steps are:

[0028] Step 1: Remove the couplings between the motor and pump, and between the motor and fan;

[0029] Step 2: Connect the adjustable coupling A to the motor rotor shaft;

[0030] Step 3: The non-drive end dummy shaft includes an adjustable coupling B and a coupling B. The adjustable coupling B is placed on the rotor shaft diameter and fixed. Then, the coupling B is placed on the adjustable coupling B and fixed.

[0031] Step 4: Pull the rotor and install the adjustable dummy shaft on the adjustable coupling A;

[0032] Step 5: After connecting the adjustable dummy shaft to the adjustable coupling A, secure it with the anti-dropout pin. Connect multiple adjustable dummy shafts and secure them with the anti-dropout pins until the rotor is completely withdrawn.

[0033] Step 6: After the motor stator and rotor inspection is completed, remove the components in steps 1-5.

[0034] The adjustable coupling A includes a main shaft sleeve C, a copper liner A embedded in one end of the main shaft sleeve C, and an adjusting bolt A, a chuck A and a screw plug A connecting the above two; the inner ring of one side of the main shaft sleeve C is interference-embedded with the copper liner A, the chuck A is welded to the side wall of the main shaft sleeve C, the screw plug A is placed inside the copper liner A, and the adjusting bolt A passes through the chuck A and is threadedly connected to the screw plug A.

[0035] The adjustable coupling B includes a main shaft sleeve F, a main shaft sleeve G and a main shaft sleeve E30 coaxially welded together, a copper liner D installed inside the main shaft sleeve G, a copper liner C32 installed on the inner side of the outer end of the main shaft sleeve F, an adjusting bolt B, a chuck B and a screw plug B installed on the side wall of the main shaft sleeve F, and an end plate with an axial mounting hole B installed on the inner side of the outer end.

[0036] The inner ring of one side of the main shaft sleeve F is interference-embedded with the copper liner C, the main shaft sleeve F is welded and connected with a chuck B, the screw plug B is placed inside the copper liner C, the adjusting bolt B passes through the chuck B and is threadedly connected to the screw plug B to achieve radial expansion and contraction of the screw plug B, the main shaft sleeve G is welded and connected to the main shaft sleeve F, the inner ring of the main shaft sleeve G is interference-embedded with the copper liner D; the inner ring of the main shaft sleeve E is welded and embedded outside the main shaft sleeve G, the outer side of the main shaft sleeve E is fixed with an end plate, and the axial mounting hole B is processed on the end plate.

[0037] The coupling B includes a main shaft sleeve D, a side shaft sleeve connected to one end of the main shaft sleeve D, and a copper liner B installed in the main shaft sleeve D, wherein an axial mounting hole is machined at the center of the end of the main shaft sleeve D; the side shaft sleeve is nested with the main shaft sleeve D, and the copper liner B6 is nested inside the main shaft sleeve D.

[0038] The adjustable dummy shaft includes a docking sleeve C, a main shaft sleeve B, and a docking sleeve B. The docking sleeve C is welded to the main shaft sleeve B, and the main shaft sleeve B is welded to the docking sleeve B. Two installation process holes B are provided on both sides of the main shaft sleeve B for installing anti-dropout pins.

[0039] The anti-drop pin comprises a pin, a connecting plate welded on the upper end of the pin, and a U-shaped ring welded on the connecting plate.

[0040] A telescopic high-voltage motor rotor dummy shaft extraction tool comprises a plurality of adjustable dummy shafts that can be connected at the end, and a connection structure connected to the rotor, wherein the connection structure is fixed to the adjustable dummy shafts at the end.

[0041] The connection structure is a coupling A, which includes a coaxially mounted butt sleeve A, a main sleeve A and a connecting flange, wherein the butt sleeve A is welded to one end of the main sleeve A, and the other end of the main sleeve A is welded to the connecting flange.

[0042] The middle of the connecting flange is processed with a mounting hole for welding the main shaft sleeve A, and four coupling docking holes A are provided in the circumferential direction for connection with the motor rotor.

[0043] A mounting hole A is machined on the side walls of the butt sleeve A and the main sleeve A for installing an anti-dropout pin, which is inserted into the coupling A.

[0044] The connection structure is an adjustable coupling A, which includes a main shaft sleeve C, a copper liner A embedded in one end of the main shaft sleeve C, and an adjusting bolt A, a chuck A and a screw plug A on the side walls of the above two; the inner ring of one side of the main shaft sleeve C is interference-embedded with the copper liner A, the chuck A is welded to the side wall of the main shaft sleeve C, the screw plug A is placed inside the copper liner A, and the adjusting bolt A passes through the chuck A and is threadedly connected to the screw plug A.

[0045] The adjustable dummy shaft includes a docking sleeve C, a main shaft sleeve B, and a docking sleeve B. The docking sleeve C is welded to the main shaft sleeve B, and the main shaft sleeve B is welded to the docking sleeve B. Two installation process holes B are provided on both sides of the main shaft sleeve B for installing anti-dropout pins.

[0046] The anti-drop pin comprises a pin, a connecting plate welded on the upper end of the pin, and a U-shaped ring welded on the connecting plate.

[0047] The remarkable effects of the present invention are as follows:

[0048] (1) Due to the design of a multi-stage adjustable dummy shaft, the dummy shaft required for rotor extraction is made retractable, which is suitable for rotor extraction in motor maintenance workshops and also for rotor extraction using a dummy shaft in a narrow space at a motor work site, thus solving the problem of no available dummy shaft for rotor extraction at the site.

[0049] (2) Due to the design of an adjustable coupling that can connect to motor rotors of various sizes, it is highly versatile and suitable for high-voltage motor rotor extraction work with different rotor shaft diameters;

[0050] (3) Due to the design of an adjustable coupling that can connect motor rotors of various sizes, it can effectively solve the problems of the current "dummy shaft and rotor extraction" method, such as the large number of finished dummy shafts used for high-voltage motors of different specifications, the large storage space occupied, and the high management cost;

[0051] (4) Due to the design of the anti-drop pin, it has the function of preventing the rotor from slipping off, which can completely prevent the rotor from slipping off during the extraction process and effectively reduce the risk of equipment damage;

[0052] (5) Due to the design of the coupling and the adjustable coupling, it can be reliably connected to the motor rotor, solving the problem of poor fit between the traditional finished fake shaft and the shaft neck and damage to the shaft neck. At the same time, it can effectively prevent the rotor from slipping during the extraction process, effectively reducing the risk of equipment damage;

[0053] (6) Due to the design of a coupling that can be directly connected to the motor backrest wheel, there is no need to remove the motor backrest wheel, which can solve the current problem of frequent disassembly and installation of the motor backrest wheel when pulling out the rotor. It does not involve hot work and effectively reduces the risk of equipment damage and personnel burns;

[0054] (7) Due to the design of a multi-stage adjustable dummy shaft, the telescopic function of the dummy shaft for extracting the rotor is realized, which can cooperate with the on-site rotor extraction function, and can effectively solve the current problems of long dismantling and maintenance period and low maintenance efficiency of high-voltage motors, and shorten the dismantling and maintenance period of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a cross-sectional view of coupling A;

[0056] Figure 2 Schematic diagram of the installation process holes on coupling A;

[0057] Figure 3 This is a schematic diagram of the coupling butt hole at the bottom of coupling A;

[0058] Figure 4 Schematic diagram to prevent out of stock;

[0059] Figure 5 It is a cross-sectional view of the adjustable coupling A;

[0060] Figure 6 It is a cross-sectional view of coupling B;

[0061] Figure 7 It is a cross-sectional view of the adjustable coupling B;

[0062] Figure 8 This is a schematic diagram of the dummy shaft structure at the non-driving end;

[0063] Figure 9 This is a schematic diagram of an adjustable false shaft;

[0064] Figure 10 Schematic diagram of the first driving end dummy shaft;

[0065] Figure 11 Schematic diagram of the second driving end dummy shaft;

[0066] Figure: 1. Adjustable dummy shaft; 2. Anti-dropout pin; 3. Coupling A; 4. Docking sleeve A; 5. Main shaft sleeve A; 6. Connecting flange; 7. Installation process hole A; 8. Coupling docking hole A; 9. Docking sleeve C; 10. Main shaft sleeve B; 11. Docking sleeve B; 12. Installation process hole B; 13. U-shaped ring; 14. Connecting plate; 15. Pin; 16. Adjustable coupling A; 17. Main shaft sleeve C; 18. Adjusting bolt A; 19 , chuck A; 20. Plug screw A; 21. Copper liner A; 22. Adjustable coupling B; 23. Coupling B; 24. Spindle sleeve D; 25. Side sleeve; 26. Copper liner B; 27. Axial mounting hole A; 28. Adjusting bolt B; 29. ​​Chuck B; 30. Spindle sleeve E; 31. Plug screw B; 32. Copper liner C; 33. Spindle sleeve F; 34. Spindle sleeve G; 35. Copper liner D; 36. Axial mounting hole B; 37. Bolt. DETAILED DESCRIPTION

[0067] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0068] Step 1: Remove the couplings between the motor and the pump (or fan, etc.);

[0069] Step 2: Connect the coupling A3 or the adjustable coupling A16 to the motor rotor shaft;

[0070] When the motor rotor shaft diameter is large, i.e., above 140 mm, connect the coupling A3 to the motor rotor shaft;

[0071] like Figure 1 、 Figure 2 and Figure 3 As shown, the coupling A3 includes a coaxially mounted docking sleeve A4, a main shaft sleeve A5 and a connecting flange 6, wherein the docking sleeve A4 is welded to one end of the main shaft sleeve A5, and the other end of the main shaft sleeve A5 is welded to the connecting flange 6.

[0072] A mounting hole for welding the main shaft sleeve A5 is processed in the middle of the connecting flange 6, and four coupling docking holes A8 are provided in the circumferential direction for connection with the motor rotor.

[0073] A mounting hole A7 is machined on the side walls of the butt sleeve A4 and the main sleeve A5 for mounting the anti-dropout pin 2, which is inserted into the coupling A3.

[0074] like Figure 4 The anti-dropout pin 2 shown includes a pin 15, a connecting plate 14 welded to the upper end of the pin 15, and a U-shaped ring 13 welded to the connecting plate 14. Pulling the U-shaped ring 13 facilitates personnel to install or remove the anti-dropout pin 2.

[0075] In the subsequent process of pulling the rotor, the pin 15 is directly inserted into the above-mentioned installation process hole A7 to fix the coupling A3 and the motor rotor, which is conducive to reliable pulling of the motor rotor.

[0076] When the motor rotor shaft diameter is small, that is, less than 140mm, the adjustable coupling A16 is placed outside the motor rotor shaft for connection;

[0077] like Figure 5 As shown, the adjustable coupling A16 includes a main shaft sleeve C17, a copper washer A21 embedded in one end of the main shaft sleeve C17, and an adjusting bolt A18, a chuck A19 and a screw plug A20 connecting the above two.

[0078] The inner ring of one side of the main shaft sleeve C17 is interference-fitted with a copper liner A21, a chuck A19 is welded to the side wall of the main shaft sleeve C17, a screw plug A20 is placed inside the copper liner A21, and an adjusting bolt A18 passes through the chuck A19 and is threadedly connected to the screw plug A20 to achieve radial expansion and contraction of the screw plug A20, thereby achieving the function of fixing rotors of different shaft diameters.

[0079] Step 3: Install the non-drive end dummy shaft on the rotor shaft to prevent the rotor from slipping during the extraction process.

[0080] When the motor rotor shaft diameter is large, put the coupling B23 on the rotor shaft diameter and use the motor's own bolts to fix it axially to the motor rotor through the axial mounting hole A27;

[0081] like Figure 6 As shown, the coupling B23 includes a main shaft sleeve D24, a side shaft sleeve 25 connected to one end of the main shaft sleeve D24, and a copper liner B26 installed in the main shaft sleeve D24, wherein an axial mounting hole 27 is processed in the center of the end of the main shaft sleeve D24.

[0082] The side sleeve 25 and the main sleeve D24 are interference-fitted, and the copper liner B26 is interference-fitted inside the main sleeve D24. When the rotor is subsequently pulled, the motor's own bolts 37 pass through the axial mounting holes A27 to secure the coupling B23 to the rotor.

[0083] When the motor rotor shaft diameter is small, put the adjustable coupling B22 on the rotor shaft diameter and fix it, then put the coupling B23 on the adjustable coupling B22 and fix it;

[0084] like Figure 7As shown, the adjustable coupling B22 includes a main shaft sleeve F33, a main shaft sleeve G34 and a main shaft sleeve E30 that are coaxially welded, a copper liner D35 installed inside the main shaft sleeve G34, a copper liner C32 installed inside the outer end of the main shaft sleeve F33, an adjusting bolt B28, a chuck B29 and a screw plug B31 installed on the side wall of the main shaft sleeve F33, and an end plate with an axial mounting hole B36 installed inside the outer end;

[0085] The inner ring of the main shaft sleeve F33 is fitted with a copper washer C32, which is welded to a chuck B29. A plug B31 is inserted into the copper washer C32. An adjusting bolt B28 passes through the chuck B29 and threads into the plug B31, allowing the plug B31 to expand and contract radially to secure rotors of varying diameters. The main shaft sleeve G34 is welded to the main shaft sleeve F33, and its inner ring is fitted with a copper washer D35. The inner ring of the main shaft sleeve E30 is welded to the outside of the main shaft sleeve G34, securing the end plate. The end plate has an axial mounting hole B36 machined in it for use with the axial mounting hole A27 of the coupling B23.

[0086] like Figure 8 As shown, for motors with smaller rotor diameters, the adjustable coupling B22 is nested within coupling B23 via main shaft sleeve E30. Bolts 37 provided with the motor are inserted through axial mounting holes A27 and connected to axial mounting holes B36 to secure the motor. This forms a single, non-drive-end dummy shaft structure, preventing the rotor from slipping during rotor extraction. For motors with larger rotor diameters, the non-drive-end dummy shaft structure consists solely of coupling B23, secured by connecting the rotor with motor bolts 37 and axial mounting holes B36.

[0087] Step 4: Pull the rotor and install the adjustable dummy shaft 1 on the coupling A3 or the adjustable coupling A16;

[0088] like Figure 9 As shown, the adjustable dummy shaft 1 includes a docking sleeve C9, a main shaft sleeve B10, and a docking sleeve B11. The docking sleeve C9 is welded to the main shaft sleeve B10, and the main shaft sleeve B10 is welded to the docking sleeve B11. Two installation process holes B12 are provided on both sides of the main shaft sleeve B10 for installing the anti-slip pin 2 and inserting it into the adjustable dummy shaft 1.

[0089] Step 5: Continue pulling the rotor and install the segmented adjustable dummy shaft 1 piece by piece until the rotor is completely pulled out;

[0090] The butt-jointed sleeve design at both ends of the adjustable dummy shaft 1 allows multiple adjustable dummy shafts 1 to be connected at the end.

[0091] When the motor rotor shaft diameter is large, after the coupling A3 is connected to the motor rotor shaft, the adjustable dummy shaft 1 is connected to the coupling A3 and then fixed by the anti-dropout pin 2. After that, multiple adjustable dummy shafts 1 are connected using the butt-jointed sleeve design of the tail connection, and then fixed by the anti-dropout pin 2 respectively until the rotor is completely withdrawn. The coupling A3, multiple adjustable dummy shafts 1, and multiple anti-dropout pins 2 fix the rotor and withdraw it to form the first drive end dummy shaft, as shown in the figure. Figure 10 shown.

[0092] When the motor rotor shaft diameter is small, after the adjustable coupling A16 is connected to the motor rotor shaft, the rotor is fixed using the adjusting bolt A18, chuck A19, and screw plug A20. The adjustable dummy shaft 1 is connected to the adjustable coupling A16 and then fixed with the anti-dropout pin 2. Using the butt-jointed sleeve design of the tail connection, multiple adjustable dummy shafts 1 are connected and then fixed with the anti-dropout pin 2 respectively until the rotor is completely withdrawn. The adjustable coupling A16, multiple adjustable dummy shafts 1, and multiple anti-dropout pins 2 secure the rotor when it is withdrawn, forming the second drive end dummy shaft, as shown in FIG. Figure 11 shown.

[0093] Step 6: After the motor stator and rotor inspection is completed, remove the components in steps 1-5.

Claims

1. A method for withdrawing the rotor of a telescopic high-voltage motor, characterized in that: When the motor rotor shaft diameter is large, the specific steps are: Step 1: Remove the couplings between the motor and pump, and between the motor and fan; Step 2: Connect the coupling A (3) to the motor rotor shaft; Step 3, install the non-drive end dummy shaft on the rotor shaft; the non-drive end dummy shaft structure is a coupling B (23), the coupling B (23) is placed on the rotor shaft diameter, and is fixed to the motor rotor axially through the axial mounting hole A (27) with the motor's own bolts; Step 4: Pull the rotor and install the adjustable dummy shaft (1) on the coupling A (3); and fix the adjustable dummy shaft (1) with the anti-drop pin; Step 5: Continue pulling the rotor and install the segmented adjustable dummy shaft (1) piece by piece. After connecting the adjustable dummy shaft (1) to the coupling A (3), fix it with the anti-drop pin (2). Connect multiple adjustable dummy shafts (1) and fix them with the anti-drop pin (2) until the rotor is completely pulled out. Step 6: After the stator and rotor maintenance work is completed, remove the components in steps 1-5; The adjustable dummy shaft (1) comprises a butt joint sleeve C (9), a main shaft sleeve B (10), and a butt joint sleeve B (11). The butt joint sleeve C (9) is welded to the main shaft sleeve B (10), and the main shaft sleeve B (10) is welded to the butt joint sleeve B (11). Two mounting process holes B (12) are provided on both sides of the main shaft sleeve B (10) for mounting the anti-drop pin (2). The anti-drop pin (2) comprises a pin (15), a connecting plate (14) welded to the upper end of the pin (15), and a U-shaped ring (13) welded to the connecting plate (14); The coupling A (3) comprises a coaxially mounted butt joint sleeve A (4), a main shaft sleeve A (5) and a connecting flange (6), wherein the butt joint sleeve A (4) is welded to one end of the main shaft sleeve A (5), and the other end of the main shaft sleeve A (5) is welded to the connecting flange (6).

2. A method for withdrawing a rotor of a telescopic high-voltage motor according to claim 1, characterized in that: The connecting flange (6) is processed in the middle with a mounting hole for welding the main shaft sleeve A (5), and is provided with four coupling butt holes A (8) in the circumferential direction for connection with the motor rotor.

3. A method for withdrawing a rotor of a telescopic high-voltage motor according to claim 2, characterized in that: A mounting hole A (7) is machined on the side wall of the butt sleeve A (4) and the main sleeve A (5) for mounting the anti-dropout pin (2), which is inserted into the coupling A (3).

4. A method for withdrawing the rotor of a telescopic high-voltage motor, characterized in that: When the motor rotor shaft diameter is small, the specific steps are: Step 1: Remove the couplings between the motor and pump, and between the motor and fan; Step 2: Connect the adjustable coupling A (16) to the motor rotor shaft; Step 3, installing the non-drive end dummy shaft on the rotor shaft; the non-drive end dummy shaft includes an adjustable coupling B (22) and a coupling B (23), the adjustable coupling B (22) is placed on the rotor shaft diameter and fixed, and then the coupling B (23) is placed on the adjustable coupling B (22) and fixed; Step 4: Pull the rotor and install the adjustable dummy shaft (1) on the adjustable coupling A (16); and fix the adjustable dummy shaft (1) with the anti-drop pin; Step 5: Continue pulling the rotor and install the segmented adjustable dummy shaft (1) piece by piece. After connecting the adjustable dummy shaft (1) to the adjustable coupling A (16), fix it with the anti-drop pin (2). Connect multiple adjustable dummy shafts (1) and fix them with the anti-drop pin (2) until the rotor is completely pulled out. Step 6: After the stator and rotor maintenance work is completed, remove the components in steps 1-5; The adjustable dummy shaft (1) comprises a butt joint sleeve C (9), a main shaft sleeve B (10), and a butt joint sleeve B (11). The butt joint sleeve C (9) is welded to the main shaft sleeve B (10), and the main shaft sleeve B (10) is welded to the butt joint sleeve B (11). Two mounting process holes B (12) are provided on both sides of the main shaft sleeve B (10) for mounting the anti-drop pin (2). The anti-drop pin (2) comprises a pin (15), a connecting plate (14) welded to the upper end of the pin (15), and a U-shaped ring (13) welded to the connecting plate (14); The adjustable coupling A (16) comprises a main shaft sleeve C (17), a copper liner A (21) embedded in one end of the main shaft sleeve C (17), and an adjusting bolt A (18), a chuck A (19) and a screw plug A (20) connecting the above two. The inner ring of one side of the main shaft sleeve C (17) is interference-embedded with the copper liner A (21), the chuck A (19) is welded to the side wall of the main shaft sleeve C (17), the screw plug A (20) is placed inside the copper liner A (21), and the adjusting bolt A (18) passes through the chuck A (19) and is threadedly connected to the screw plug A (20).

5. A method for withdrawing a rotor of a telescopic high-voltage motor according to claim 4, characterized in that: The adjustable coupling B (22) comprises a main shaft sleeve F (33), a main shaft sleeve G (34) and a main shaft sleeve E (30) coaxially welded together, a copper liner D (35) mounted inside the main shaft sleeve G (34), a copper liner C (32) mounted inside the outer end of the main shaft sleeve F (33), an adjusting bolt B (28), a chuck B (29) and a screw plug B (31) mounted on the side wall of the main shaft sleeve F (33), and an end plate with an axial mounting hole B (36) mounted inside the outer end.

6. A method for withdrawing a rotor of a telescopic high-voltage motor according to claim 5, characterized in that: The inner ring of one side of the spindle sleeve F (33) is interference-embedded with the copper liner C (32), the spindle sleeve F (33) is welded and connected with the chuck B (29), the screw plug B (31) is placed inside the copper liner C (32), the adjusting bolt B (28) passes through the chuck B (29) and is threadedly connected with the screw plug B (31), so as to realize the radial expansion and contraction of the screw plug B (31), the spindle sleeve G (34) is welded and connected with the spindle sleeve F (33), the inner ring of the spindle sleeve G (34) is interference-embedded with the copper liner D (35); the inner ring of the spindle sleeve E (30) is welded and embedded outside the spindle sleeve G (34), the outer side of the spindle sleeve E (30) is fixed with an end plate, and the axial mounting hole B (36) is processed on the end plate.

7. A method for withdrawing a rotor of a telescopic high-voltage motor according to any one of claims 1 to 6, characterized in that: The coupling B (23) comprises a main shaft sleeve D (24), a side shaft sleeve (25) connected to one end of the main shaft sleeve D (24), and a copper liner B (26) installed in the main shaft sleeve D (24), wherein an axial mounting hole (27) is machined at the center of the end of the main shaft sleeve D (24); the side shaft sleeve (25) and the main shaft sleeve D (24) are interference-fitted, and the copper liner B (26) is interference-fitted inside the main shaft sleeve D (24).

8. A telescopic high-voltage motor rotor false shaft extraction tool, characterized in that: It comprises a plurality of adjustable dummy shafts (1) that can be connected at the end, and a connection structure connected to the rotor, wherein the connection structure is fixed to the adjustable dummy shafts (1) at the end; The connecting structure is a coupling A (3), which comprises a coaxially mounted butt joint sleeve A (4), a main shaft sleeve A (5) and a connecting flange (6), wherein the butt joint sleeve A (4) is welded to one end of the main shaft sleeve A (5), and the other end of the main shaft sleeve A (5) is welded to the connecting flange (6); Alternatively, the connection structure is an adjustable coupling A (16), which includes a main shaft sleeve C (17), a copper liner A (21) embedded in one end of the main shaft sleeve C (17), and an adjusting bolt A (18), a chuck A (19) and a screw plug A (20) on the side walls of the above two; the inner ring of one side of the main shaft sleeve C (17) is interference-embedded with the copper liner A (21), the chuck A (19) is welded to the side wall of the main shaft sleeve C (17), the screw plug A (20) is placed inside the copper liner A (21), and the adjusting bolt A (18) passes through the chuck A (19) and is threadedly connected to the screw plug A (20); The adjustable dummy shaft (1) comprises a butt joint sleeve C (9), a main shaft sleeve B (10), and a butt joint sleeve B (11). The butt joint sleeve C (9) is welded to the main shaft sleeve B (10), and the main shaft sleeve B (10) is welded to the butt joint sleeve B (11). Two mounting process holes B (12) are provided on both sides of the main shaft sleeve B (10) for mounting the anti-drop pin (2). The anti-drop pin (2) comprises a pin (15), a connecting plate (14) welded to the upper end of the pin (15), and a U-shaped ring (13) welded to the connecting plate (14).

9. A telescopic high-voltage motor rotor and false shaft extraction tool as claimed in claim 8, characterized in that: The connecting flange (6) is processed in the middle with a mounting hole for welding the main shaft sleeve A (5), and is provided with four coupling butt holes A (8) in the circumferential direction for connection with the motor rotor.

10. A telescopic high-voltage motor rotor and false shaft extraction tool as claimed in claim 9, characterized in that: A mounting hole A (7) is machined on the side wall of the butt sleeve A (4) and the main sleeve A (5) for mounting the anti-dropout pin (2), which is inserted into the coupling A (3).

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