On-segment disassembly-free bearing replacement device and method for asynchronous motor with single bearing structure
By adopting a single bearing structure and specific tooling device in the asynchronous motor, the method of replacing the bearings without disassembly in the segment is realized, and the problems of complex and high cost of disassembly and repair of the bearing failure of asynchronous motors in the prior art are solved, and the replacement is fast, low cost and high efficiency are achieved.
Patent Information
- Application Number
- CN202411969656.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-04
AI Technical Summary
The existing asynchronous motor bearing failure dismantling and maintenance requires dismantling the entire motor, resulting in complex operation, high cost, low efficiency, and difficult to replace in sections.
The single-bearing structure asynchronous motor is used to replace the bearing device without disassembly in the segment, including rotor concentricity adjustment tooling, shaft sleeve, rotor support screw, double-head screw of pull-out bearing outer ring, etc., these tooling and methods are used to replace the bearing.
It realizes the rapid, low cost and high efficiency of replacing new bearings during motor bearing failure or overhaul, avoids the back and forth motor transportation and complex disassembly and reassembly processes, and shortens the maintenance cycle.
Smart Images
Figure CN119765830A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of asynchronous motor processing equipment, and in particular to a device and method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly. Background Art
[0002] Conventional asynchronous motor bearing failure disassembly and repair all involve removing the motor from the transmission system as a whole, returning the motor to a professional manufacturer or repair station for disassembly to complete the stator and rotor separation and bearing disassembly, and finally replacing the bearings to reassemble the motor and complete the factory test before reinstalling it into the transmission system. This method requires a lot of tooling to disassemble and install the transmission system and the motor each time, and has disadvantages such as heavy workload, low efficiency, and high cost.
[0003] In order to save the axial space of the bogie, simplify the structure of the traction drive system and improve the reliability of the traction system, a traction motor with a single bearing structure has emerged. The main structure of this single bearing structure motor is different from that of the ordinary asynchronous traction motor. The schematic diagram of the integrated structure of the motor and the gearbox is shown in the figure. Figure 1 As shown, after the motor structure is optimized, there is no D-end end cover, eliminating the conventional asynchronous motor D-end bearing and the small gear structure between the motor and the gear box, saving the axial space of the integrated transmission system and improving the system operation reliability. If the motor bearing of this structure fails during operation and the motor needs to be disassembled to replace the bearing, the motor disassembly and reassembly is more complicated and more costly than that of conventional asynchronous motors.
[0004] Conventional asynchronous motor bearing failure disassembly and repair all involve removing the motor from the transmission system as a whole, returning the motor to a professional manufacturer or repair station for disassembly to complete the stator and rotor separation and bearing disassembly, and finally replacing the bearings to reassemble the motor and complete the factory test before reinstalling it into the transmission system. This method requires a lot of tooling to disassemble and install the transmission system and the motor each time, and has disadvantages such as heavy workload, low efficiency, and high cost.
[0005] How to realize reliable, efficient and low-cost bearing replacement of this motor with integrated motor and gearbox structure is a problem that must be solved in motor manufacturing technology. Summary of the invention
[0006] To solve the above problems, the present invention discloses a device and method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly, which has a simple structure, is easy to carry and has low cost, and is suitable for replacing bearings of this type of motor without disassembly.
[0007] A device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly comprises a rotor concentricity adjustment tool, a shaft sleeve, a rotor support screw, a double-headed screw for pulling out the outer ring of the bearing, a baffle for pulling out the outer ring of the bearing, a pressure plate for pulling out the outer ring of the bearing, a support screw, an induction heater with an induction coil, an induction heater, and a pressure cylinder. The rotor concentricity adjustment tool is fastened to the installation position of the speed sensor seat of the motor N-end end cover by bolts, and the stator center is positioned through the transition fit between the stopper and the end cover. Four adjustment bolts are installed in the radial four screw holes of the rotor concentricity adjustment tool, and the shaft sleeve installed on the N-end shaft adjusts the concentricity of the rotor and the motor N-end end cover to ensure that the axial center line of the rotor is basically coincident with the axial center line of the end cover bearing chamber. The shaft sleeve is axially fixed to the N-end end face of the shaft by bolts, and the rotor center is positioned through the transition fit between the stopper and the shaft head. The support screw is fastened to the central screw hole of the shaft sleeve through the bottom thread. The rotor support screw is fastened in the screw hole of the N-end end cover of the motor through the rear end thread to support the rotor to prevent the rotor from sinking due to the lack of N-end support and fixation when the rotor concentricity adjustment tool adjustment bolt is loosened during the bearing replacement operation.
[0008] Furthermore, the stop of the rotor concentricity adjustment tooling and the stop of the N-end end cover of the motor adopt a transition fit, and 6 small through holes are evenly distributed on the outside to fix the tooling to the end cover. The two large through holes symmetrically distributed in the 12 points of the tooling are used to avoid the rotor support screw to avoid interference with it and improper installation.
[0009] Furthermore, the stopper of the shaft sleeve and the matching part of the N-end shaft adopt a transition fit, 3 evenly distributed through holes are used to install bolts to fix the shaft sleeve to the shaft, 3 evenly distributed screw holes are used to disassemble the shaft sleeve, the center screw hole is used to install the support screw, and the tail of the shaft sleeve is inlaid with a tapered copper sleeve. The outer diameter of the copper sleeve is slightly smaller than the outer diameter of the bearing inner ring, which has a guiding role when disassembling and installing the bearing outer ring.
[0010] Furthermore, the outer diameter of the pressing cylinder is approximately smaller than the inner diameter of the inner cylinder of the rotor concentricity adjustment tooling, and the inner diameter of the pressing cylinder is approximately larger than the outer diameter of the outer ring of the cylindrical bearing to ensure that the pressing cylinder is only pressed on the outer end surface of the bearing sleeve when the outer ring of the bearing is installed. The length of the hollow cylindrical body of the pressing cylinder is greater than the axial length of the shaft sleeve, and 4 notches evenly distributed at 90° are opened on the pressing cylinder to avoid the four evenly distributed adjustment bolts on the rotor concentricity adjustment tooling.
[0011] A method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly, the specific steps are as follows: When in use, the first step is to remove the speed sensor seat, test gear plate and N-end bearing outer cover and store them away. Align the threaded sides of the two rotor support screws with the screw holes of the rotor support screws on the N-end end cover of the motor, and then use a wrench to tighten the two rotor support screws into place. Then align the copper sleeve side of the shaft sleeve with the threaded hole on the N-end end face of the shaft, and then use three process bolts to fasten the shaft sleeve to the shaft and tighten it to the required torque. The second step is to align the stop of the rotor concentricity adjustment tooling with the stop of the end cover and the rotor support screw through the through hole on the top of the tooling, and then use six process bolts to fasten it to the N-end end cover of the motor. Tighten the bolt torque symmetrically, install the four adjustment bolts into the corresponding screw holes of the rotor concentricity adjustment tooling, and adjust the positions of the four adjustment bolts so that the distances from the four evenly distributed points on the inner circle of the rotor concentricity adjustment tooling to the four evenly distributed points on the outer circle of the shaft sleeve are basically equal. Use a vernier caliper to check the four distance values and record A, B, C and D respectively. The error of the four values is required to be no more than 0.03 mm. If the requirements are not met, continue to fine-tune the adjustment bolts until the requirements are met, thereby confirming that the center of the shaft basically coincides with the center of the bearing chamber of the N-end end cover of the motor.
[0012] The third step is to install the support screw into the center screw hole of the shaft sleeve and tighten it into place. Install the four double-headed screws for the outer ring of the bearing into the four screw holes evenly distributed on the end surface of the bearing sleeve and tighten them into place. Align the center holes of the outer ring pressure plate of the bearing, the hollow hydraulic head of the hydraulic pump, and the baffle of the outer ring of the bearing. After the support screw passes through the center hole, use the hexagonal nuts and flat washers that come with the four double-headed screws for the outer ring of the bearing to tighten them to the outer threads of the double-headed screws of the outer ring of the bearing until the four nuts press the gaskets against the surface of the baffle. Start the hydraulic pump to pull the bearing sleeve with the column bearing outer ring out of the bearing chamber of the end cover as a whole.
[0013] Step 4. Remove the four adjustment bolts of the rotor concentricity adjustment tool and the tail nuts of the four double-headed screws of the bearing outer ring, remove the baffle plate, pressure plate and hydraulic pump of the bearing outer ring from the support screw, remove the bearing sleeve with the bearing outer ring from the shaft sleeve, remove the four double-headed screws of the bearing outer ring on the bearing sleeve, and remove the shaft sleeve from the shaft.
[0014] Step 5. Use the induction coil and the induction heater to heat the bearing sleeve and the inner ring of the column bearing respectively. After the heating temperature reaches 100 degrees Celsius, quickly remove the bearing sleeve from the outer ring of the column bearing. Use the same method to heat the inner ring of the bearing to 100 degrees Celsius and then quickly remove the inner ring of the column bearing from the shaft bearing block.
[0015] Step 6. Clean the residual grease on the bearing outer cover, the oil storage tank of the motor N-end end cover, the bearing sleeve and the bearing chamber surface, replace the new column bearing, take out the bearing outer ring and fill it with grease as required, place the new column bearing inner ring on the induction heater and heat it to 100 degrees Celsius, then quickly put on heat-insulating gloves, remove the column bearing inner ring and hot-fit it onto the shaft bearing block, use the induction coil sleeve and the matching induction heater to heat the bearing sleeve, and when the bearing sleeve temperature reaches 100 degrees Celsius, quickly put on heat-insulating gloves and hot-fit the bearing sleeve onto the column bearing outer ring.
[0016] Step 7. Install the shaft sleeve onto the shaft through three process bolts and tighten it to the required torque. Install the support screw into the center screw hole of the shaft sleeve and tighten it in place. Pass the outer ring bearing sleeve of the column bearing through the shaft sleeve and then put it on the outer ring of the tail copper sleeve. Align the stop of the rotor concentricity adjustment tooling with the stop of the end cover and the rotor support screw through the top through-hole of the tooling, and fasten it to the N-end end cover of the motor with six process bolts in a symmetrical manner. Tighten the bolt torque. Install the four adjustment bolts into the corresponding screw holes of the rotor concentricity adjustment tooling. Adjust the positions of the four adjustment bolts so that the distances from the four evenly distributed points on the inner circle of the rotor concentricity adjustment tooling to the four evenly distributed points on the outer circle of the shaft sleeve are basically equal. Use a vernier caliper to detect the four distance values and record A, B, C and D respectively. The error of the four values is required to be no more than 0.03 mm. If the requirements are not met, continue to fine-tune the adjustment bolts until the requirements are met, so as to confirm that the center of the shaft basically coincides with the center of the bearing chamber of the N-end end cover of the motor.
[0017] Step 8. Align the center hole of the pressure cylinder with the support screw and four evenly spaced adjustment bolts, then pass the adjustment bolts until the pressure cylinder is attached to the outer surface of the bearing sleeve. Align the hollow pump head of the hydraulic pump and the outer ring baffle of the pull bearing with the support screw, then pass the screw and tighten it in place with a hexagonal nut. Start the hydraulic pump to press the bearing sleeve with the outer ring of the column bearing into the bearing chamber as a whole. When the hydraulic pump pressure reaches 10MPa, release the pressure, remove the outer ring baffle of the pull bearing, the hydraulic pump and the pressure cylinder. Remove the rotor coaxiality adjustment tool from the end cover, remove the support screw from the shaft sleeve, and remove the shaft sleeve from the shaft.
[0018] Step 9. Add grease to the oil reservoir of the N-end bearing cover as required, align the bearing cover seal gasket with the through hole position and stick it to the bearing cover mating surface, then assemble the two into a whole, align the motor N-end end cover mounting screw hole, install it on the end cover, tighten the bolts symmetrically and tighten the torque value as required and mark the anti-loosening mark, install the test gear plate on the shaft as required, tighten the bolts symmetrically and tighten the torque value as required and mark the anti-loosening mark. Finally, align the speed sensor seat with the motor N-end end cover mounting screw hole, install it on the end cover, tighten the bolts symmetrically and tighten the torque value as required and mark the anti-loosening mark, and finally complete the motor disassembly-free N-end column bearing replacement operation.
[0019] Beneficial effects of the present invention: 1. After the implementation of the present invention, when a motor bearing fails or the bearing reaches the overhaul period and needs to be replaced with a new bearing, two after-sales personnel can be arranged on site at the vehicle depot to perform bearing replacement and maintenance operations. Normally, a generator bearing can be replaced in one day, with a short maintenance cycle and low cost, avoiding the need for the generator to be transported back and forth to the factory for maintenance and disassembly. Not only does it require special protective tooling (because the motor and gearbox are an integrated structure) to protect the gearbox and motor bearings to avoid damage to the bearings during transportation, but the gearbox and motor must be transported together during transportation, which also has a high overall transportation cost.
[0020] 2. The tooling structure required for this method is simple, easy to carry, and low in cost. It is suitable for the bearing replacement operation of this model motor without disassembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 , a schematic diagram of the first stage required for a method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly provided by the present invention; Figure 2 , a schematic diagram of the second stage required for a method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly provided by the embodiment of the present invention; Figure 3 , a schematic diagram of the three stages required for a method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly provided by the present invention; Figure 4 , a schematic diagram of the fourth stage required for a method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly provided by the present invention; Figure 5 , a schematic diagram of the five stages required for a method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly provided by the present invention; Figure 6 It is a schematic diagram of the structure of the outer ring pressure plate of the pull bearing provided by the implementation of the present invention; Figure 7 It is a schematic diagram of the structure of the rotating shaft sleeve provided by the embodiment of the present invention; Figure 8 It is a schematic diagram of the structure of the rotor concentricity adjustment tool provided by the embodiment of the present invention; Fig. 9 It is a schematic diagram of the pressing cylinder structure provided by the embodiment of the present invention; Fig.10 It is a schematic diagram of the structure of the outer ring baffle of the pull-out bearing provided by the embodiment of the present invention; Fig.11 It is a schematic diagram of the rotor support screw structure provided by the embodiment of the present invention; Fig.12 It is a schematic diagram of the double-headed screw structure of the outer ring of the pull-out bearing provided by the embodiment of the present invention; Fig.13It is a schematic diagram of the support screw structure provided by the implementation of the present invention; Fig.14 The present invention Figure 2 Partial view in the direction of A.
[0022] List of reference numerals: 1-motor, 1-1. motor stator, 1-2. motor rotor, 1-2-1. N-end shaft, 1-3. motor N-end cover, 2. gearbox, 3. speed sensor seat, 4. speed measuring gear plate, 5. N-end bearing cover, 6. rotor support screw, 7. rotor concentricity adjustment tool, 8. shaft sleeve, 9. column bearing outer ring, 10. column bearing inner ring, 11. bearing sleeve, 12. double-headed screw for pulling bearing outer ring, 13. pull bearing outer ring baffle, 14. hydraulic pump, 15. support screw, 16. pull bearing outer ring pressure plate, 17. induction heater with induction coil, 18. press cylinder. DETAILED DESCRIPTION
[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.
[0024] like Figure 1-14 , as shown in the figure, a method for replacing bearings of an asynchronous motor with a single bearing structure in a stage without disassembly is provided in this embodiment. The required devices of the method include a rotor concentricity adjustment tool 7, a shaft sleeve 8, a rotor support screw 6, a double-headed screw 12 for pulling out the bearing outer ring, a baffle 13 for pulling out the bearing outer ring, a pressure plate 16 for pulling out the bearing outer ring, a support screw 15, an induction heater 17 with an induction coil, and a pressing cylinder 18. The rotor concentricity adjustment tool 7 is fastened to the installation position of the speed sensor seat 3 of the motor N-end end cover 1-3 by bolts, and the stator center is positioned through the transition fit between the stopper and the end cover. Four adjustment bolts are installed in the radial four screw holes of the rotor concentricity adjustment tool 7, and the shaft sleeve 8 installed on the N-end shaft 1-2-1 acts together to adjust the concentricity of the rotor and the N-end end cover to ensure that the axial center line of the rotor is basically coincident with the axial center line of the end cover bearing chamber. The shaft sleeve 8 is axially fixed to the end face of the N-end shaft 1-2-1 by bolts, and the rotor center is positioned through the transition fit between the stopper and the shaft head. The support screw 15 is fastened to the central screw hole of the shaft sleeve 8 through the bottom thread. The rotor support screw 6 is fastened to the screw hole of the motor N-end end cover 1-3 through the rear end thread to support the rotor to prevent the rotor from sinking without N-end support when the rotor concentricity adjustment tool 7 adjustment bolt is loosened during the bearing replacement operation.
[0025] Furthermore, the stopper of the rotor concentricity adjustment tool 7 and the matching stopper of the motor N-end end cover 1-3 adopt transitional fit, and 6 small through holes are evenly distributed on the outside to fix the tool to the end cover. The two large through holes symmetrically distributed in the middle of the tool 12 points are used to avoid the rotor support screw 6 to avoid interference with it and improper installation. Further, the stopper of the shaft sleeve 8 and the matching part of the N-end shaft 1-2-1 adopt transitional fit, and 3 through holes are evenly distributed to install bolts to fix the shaft sleeve 8 to the shaft 1-2-1, and 3 screw holes are evenly distributed for disassembly of the shaft sleeve. The center screw hole is used to install the support screw 15. The tail of the shaft sleeve 8 is inlaid with a conical copper sleeve. The outer diameter of the copper sleeve is slightly smaller than the outer diameter of the inner ring of the bearing, which has a guiding effect when disassembling and installing the outer ring of the bearing.
[0026] Furthermore, the outer diameter of the pressing cylinder 18 is approximately smaller than the inner diameter of the inner cylinder of the rotor concentricity adjustment tool 7, and the inner diameter of the pressing cylinder 18 is approximately larger than the outer diameter of the cylindrical bearing outer ring 9 to ensure that the pressing cylinder is only pressed on the outer end surface of the bearing sleeve 11 when the bearing outer ring is installed. The length of the inner cylindrical hollow body of the pressing cylinder is greater than the axial length of the shaft sleeve 8. Four notches evenly distributed at 90° are opened on the pressing cylinder 18 to avoid the four evenly distributed adjustment bolts on the rotor concentricity adjustment tool 7.
[0027] When in use, the first step is to remove and store the speed sensor seat 3, the speed measuring gear plate 4 and the N-end bearing outer cover 5 on the N-end end cover 1-3 of the motor, align the threaded sides of the two rotor support screws 6 with the screw holes of the rotor support screws on the N-end end cover 1-3 of the motor, and then use a wrench to tighten the two rotor support screws 6 into place, and then align the copper sleeve side of the shaft sleeve 8 with the threaded hole on the N-end end face of the shaft 1-2-1, and then use three process bolts to fasten the shaft sleeve 8 to the shaft 1-2-1 and tighten it to the required torque.
[0028] The second step is to align the stop of the rotor concentricity adjustment tool 7 with the stop of the end cover. After the rotor support screw 6 passes through the through hole on the top of the tool, use six process bolts to fasten it to the N-end end cover 1-3 of the motor and tighten the bolt torque symmetrically. Install the four adjustment bolts into the corresponding screw holes of the rotor concentricity adjustment tool 7, and adjust the positions of the four adjustment bolts so that the distances from the four evenly distributed points on the inner circle of the rotor concentricity adjustment tool 7 to the four evenly distributed points on the outer circle of the shaft sleeve 8 are basically equal. Use a vernier caliper to detect the four distance values and record A, B, C and D respectively. The error of the four values is required to be no more than 0.03 mm. If the requirement is not met, continue to fine-tune the adjustment bolts until the requirement is met, thereby confirming that the center of the shaft basically coincides with the center of the bearing chamber of the N-end end cover of the motor.
[0029] The third step is to install the support screw 15 into the center screw hole of the shaft sleeve 8 and tighten it in place, install the four bearing outer ring stud screws 12 into the four screw holes evenly distributed on the end surface of the bearing sleeve 11 and tighten them in place, align the center holes of the bearing outer ring pressure plate 16, the hollow hydraulic head of the hydraulic pump 14 and the bearing outer ring baffle 13, and after the support screw 15 passes through the center hole, use the four bearing outer ring stud screws 12 with their own hexagonal nuts and flat washers to tighten them to the outer threads of the bearing outer ring stud screws until the four nuts press the gaskets tightly against the baffle surface, start the hydraulic pump 14 to pull the bearing sleeve 11 with the column bearing outer ring 9 as a whole out of the end cover bearing chamber.
[0030] Step 4. Remove the four adjustment bolts and the tail nuts of the four bearing outer ring stud screws 12 on the rotor concentricity adjustment tool 7, remove the bearing outer ring baffle 13, pressure plate 16 and hydraulic pump 14 from the support screw 15, remove the bearing sleeve 11 with the bearing outer ring from the shaft sleeve 8, remove the four bearing outer ring stud screws 12 on the bearing sleeve 11, and remove the shaft sleeve 8 from the shaft 1-2-1.
[0031] The fifth step is to heat the bearing sleeve 11 and the column bearing inner ring 10 respectively with the induction coil sleeve and the induction heater 17. When the temperature reaches 100 degrees Celsius, the bearing sleeve 11 is quickly removed from the column bearing outer ring 9. The column bearing inner ring 10 is heated in the same way. When the temperature reaches 100 degrees Celsius, the column bearing inner ring 10 is quickly removed from the bearing block of the rotating shaft 1-2-1.
[0032] Step 6. Clean the remaining grease on the bearing outer cover 5, the oil storage tank of the motor N-end end cover 1-3, the bearing sleeve 11 and the bearing chamber surface, replace the new column bearing, take out the bearing outer ring 9 and fill it with grease as required, place the new column bearing inner ring 10 on the induction heater and heat it to 100 degrees Celsius, then quickly put on heat-insulating gloves, remove the column bearing inner ring 10 and hot-slip it onto the bearing block of the rotating shaft 1-2-1, use an induction coil sleeve to match the induction heater and heat the bearing sleeve 11. When the temperature of the bearing sleeve 11 reaches 100 degrees Celsius, quickly put on heat-insulating gloves and hot-slip the bearing sleeve 11 onto the column bearing outer ring 9.
[0033] Step 7. Install the shaft sleeve 8 onto the shaft 1-2-1 through three process bolts and tighten the torque as required. Install the support screw 15 into the center screw hole of the shaft sleeve 8 and tighten it into place. Pass the column bearing outer ring 9 and the bearing sleeve 11 through the shaft sleeve 8 and then put it on the outer ring of the tail copper sleeve. Align the stop of the rotor concentricity adjustment tool 7 with the stop of the end cover, and after the rotor support screw 6 passes through the through hole on the top of the tool, use six process bolts to fasten it to the N-end end cover 1-3 of the motor and tighten the bolt torque symmetrically. Install the four adjustment bolts into the corresponding screw holes of the rotor concentricity adjustment tool 7, and adjust the positions of the four adjustment bolts so that the distances from the four evenly distributed points on the inner circle of the rotor concentricity adjustment tool 7 to the four evenly distributed points on the outer circle of the shaft sleeve 8 are basically equal. Use a vernier caliper to check the values of these four distances and record A, B, C and D respectively. The error of the four values is required to be no more than 0.03 mm. If the requirement is not met, continue to fine-tune the adjustment bolts until the requirement is met, thereby confirming that the center of the shaft basically coincides with the center of the bearing chamber of the N-end end cover of the motor.
[0034] Step 8. Align the center hole of the pressure cylinder 18 with the support screw 15 and four evenly spaced adjustment bolts, and then pass the adjustment bolts until the pressure cylinder 18 is attached to the outer surface of the bearing sleeve. Align the center holes of the hollow pump head of the hydraulic pump 14 and the outer ring baffle 13 of the pull bearing with the support screw 15, and then tighten them in place with hexagonal nuts. Start the hydraulic pump 13 and press the bearing sleeve 11 with the outer ring of the column bearing 9 into the bearing chamber as a whole. When the hydraulic pump pressure reaches 10MPa, release the pressure, and remove the outer ring baffle 13 of the pull bearing, the hydraulic pump 14 and the pressure cylinder 18. Remove the rotor coaxiality adjustment tool 7 from the end cover 1-3, remove the support screw 15 from the shaft sleeve 8, and remove the shaft sleeve from the shaft 1-2-1.
[0035] Step 9. Add grease to the oil reservoir of the N-end bearing cover 5 as required, align the bearing cover seal gasket with the through hole position and stick it to the bearing cover mating surface, then assemble the two into a whole, align the motor N-end end cover 1-3 mounting screw holes, install them on the end cover, tighten the bolts symmetrically and tighten the torque value as required and mark the anti-loosening mark, install the test gear plate 4 on the shaft 1-2-1 as required, tighten the bolts symmetrically and tighten the torque value as required and mark the anti-loosening mark. Finally, align the speed sensor seat 3 with the motor N-end end cover 1-3 mounting screw holes, install it on the end cover, tighten the bolts symmetrically and tighten the torque value as required and mark the anti-loosening mark, and finally complete the motor disassembly-free N-end column bearing replacement operation.
[0036] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.
Claims
1. A device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly, characterized in that : It comprises a rotor concentricity adjustment tool (7), a shaft sleeve (8), a rotor support screw (6), a double-headed screw for pulling out the outer ring of the bearing (12), a baffle plate for pulling out the outer ring of the bearing (13), a pressure plate for pulling out the outer ring of the bearing (16), a support screw (15), an induction heater with an induction coil (17) and a pressure cylinder (18); the rotor concentricity adjustment tool (7) is fastened to the installation position of the speed sensor seat (3) of the motor N-end end cover (1-3) by bolts; and the stator center is positioned by transitional fit with the motor N-end end cover (1-3) through a stopper, and four adjustment screws are installed in four radially evenly distributed screw holes of the rotor concentricity adjustment tool (7). Bolts; wherein the shaft sleeve (8) is fixed on the N-end shaft (1-2-1) by three bolts; the support screw 15 is fastened to the center screw hole of the shaft sleeve (8) by the bottom thread; the rotor support screw (6) is threadedly fastened to the screw hole of the N-end end cover (1-3) of the motor; an induction heater (17) with an induction coil heats the bearing sleeve (11) and the inner ring of the column bearing (10) respectively, the center hole of the pressing cylinder (18) is aligned with the support screw (15) and the bottom surface of the pressing cylinder (18) is attached to the outer surface of the bearing sleeve by adjusting the bolts.
2. The device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly according to claim 1 is characterized in that The stopper of the rotor concentricity adjustment tool (7) and the stopper of the motor N-end end cover (1-3) are transitionally matched, and six small through holes are evenly distributed on the outer side thereof for fixing the rotor concentricity adjustment tool 7 to the motor N-end end cover (1-3), wherein the rotor concentricity adjustment tool (7) has two through holes with a diameter larger than the maximum outer diameter of the rotor support screw symmetrically distributed in the 12-point direction.
3. The device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly according to claim 1 is characterized in that The stopper on the shaft sleeve (8) and the matching part of the N-end shaft (1-2-1) adopt a transition fit, wherein the shaft sleeve (8) has three evenly distributed through holes for installing bolts to fix the shaft sleeve (8) to the N-end shaft (1-2-1), wherein three evenly distributed screw holes are used to disassemble the shaft sleeve (8), and the center screw hole is used to install a support screw (15), and the tail of the shaft sleeve (8) is inlaid with a tapered copper sleeve, and the outer diameter of the tapered copper sleeve is smaller than the outer diameter of the inner ring of the bearing.
4. The device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly according to claim 1 is characterized in that The outer diameter of the pressing cylinder (18) is approximately smaller than the inner diameter of the inner cylinder of the rotor concentricity adjustment tool (7), the inner diameter of the pressing cylinder (18) is larger than the outer diameter of the cylindrical bearing outer ring (9), and the length of the inner cylindrical hollow body of the pressing cylinder (18) is larger than the axial length of the shaft sleeve (8).
5. The device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly according to claim 4 is characterized in that Four notches evenly spaced at 90° are provided on the pressure cylinder (18) to avoid four evenly spaced adjustment bolts on the rotor concentricity adjustment tool (7).
6. The device for replacing bearings of an asynchronous motor with a single bearing structure without disassembly according to claim 4 is characterized in that The shaft sleeve (8) is axially fixed to the end surface of the N-end shaft (1-2-1) by bolts and is transitionally matched with the shaft head through a stop to locate the center of the rotor.
7. A method for replacing bearings of an asynchronous motor with a single bearing structure without disassembly, characterized in that :Specific steps include: Step 1: When in use, remove the speed sensor seat (3), speed measuring gear plate (4) and N-end bearing outer cover (5) on the N-end end cover (1-3) of the motor and store them away. Align the threaded sides of the two rotor support screws (6) with the screw holes of the rotor support screws on the N-end end cover (1-3) of the motor, and tighten the two rotor support screws (6) in place with a wrench. Then align the copper sleeve side of the shaft sleeve (8) with the threaded hole on the end face of the N-end shaft (1-2-1), and tighten the shaft sleeve (8) to the N-end shaft (1-2-1) with three process bolts. Step 2: Align the stop of the rotor concentricity adjustment tool (7) with the stop of the end cover. After the rotor support screw (6) passes through the through hole at the top of the rotor concentricity adjustment tool (7), use six process bolts to fasten it to the N-end end cover (1-3) of the motor. Tighten the bolt torque in a symmetrical manner. Install the four adjustment bolts into the corresponding screw holes of the rotor concentricity adjustment tool (7). Adjust the positions of the four adjustment bolts so that the distances from the four evenly distributed points on the inner circle of the rotor concentricity adjustment tool (7) to the four evenly distributed points on the outer circle of the shaft sleeve (8) are basically equal. Use a vernier caliper to detect the distance values of these four points and record them as A, B, C and D respectively. The error of the four values is required to be no more than 0.03 mm. If the requirement is not met, continue to fine-tune the adjustment bolts until the requirement is met, thereby confirming that the center of the shaft is basically coincident with the center of the bearing chamber of the N-end end cover of the motor. Step 3: Install the support screw (15) into the central screw hole of the shaft sleeve (8), install the four bearing outer ring double-ended screws (12) into the four screw holes evenly distributed on the end surface of the bearing sleeve (11), align the center holes of the bearing outer ring pressure plate (16), the hollow hydraulic head of the hydraulic pump (14) and the bearing outer ring baffle (13) with the support screw (15), and after passing through the center hole, use the hexagonal nuts and flat washers provided by the four bearing outer ring double-ended screws (12) 12 to tighten them onto the outer threads of the bearing outer ring double-ended screws until the four nuts press the washers against the baffle surface, start the hydraulic pump (14) and pull the bearing sleeve (11) with the columnar bearing outer ring (9) out of the bearing chamber of the end cover as a whole; Step 4. Remove the four adjustment bolts and the nuts at the tails of the four bearing outer ring double-ended screws (12) on the rotor concentricity adjustment tool (7), remove the bearing outer ring baffle (13), the pressure plate (16) and the hydraulic pump (14) from the support screw (15), remove the bearing sleeve (11) with the bearing outer ring from the shaft sleeve (8), remove the four bearing outer ring double-ended screws (12) on the bearing sleeve (11), and remove the shaft sleeve (8) from the N-end shaft (1-2-1); Step 5: Use the induction coil sleeve and the matching induction heater (17) to heat the bearing sleeve (11) and the column bearing inner ring (10) respectively. When the temperature reaches 100 degrees Celsius, quickly remove the bearing sleeve (11) from the column bearing outer ring (9). Use the same method to heat the column bearing inner ring (10). When the temperature reaches 100 degrees Celsius, quickly remove the column bearing inner ring (10) from the N-end shaft (1-2-1) bearing block. Step 6. Clean the residual grease on the bearing outer cover (5), the oil storage tank of the motor N-end end cover, the bearing sleeve (11) and the bearing chamber surface, replace the new column bearing, take out the bearing outer ring (9) and fill it with grease as required, place the new column bearing inner ring (10) on the induction heater and heat it to 100 degrees Celsius, then quickly put on heat-insulating gloves, remove the column bearing inner ring (10) and heat it onto the N-end shaft (1-2-1) bearing stopper, use the induction coil to cover the matching induction heater to heat the bearing sleeve (11), and when the temperature of the bearing sleeve (11) reaches 100 degrees Celsius, quickly put on heat-insulating gloves and heat the bearing sleeve (11) onto the column bearing outer ring (9); Step 7. Install the shaft sleeve (8) to the N-end shaft (1-2-1) with three process bolts, install the support screw (15) into the center screw hole of the shaft sleeve (8) and tighten it. Pass the bearing sleeve (11) with the column bearing outer ring (9) through the shaft sleeve (8) and then put it on the outer ring of the tail copper sleeve. Align the stop of the rotor concentricity adjustment tool (7) with the stop of the end cover. After the rotor support screw (6) passes through the top through hole of the tool, use six process bolts to tighten it to the N-end end cover (1-3) of the motor. Tighten the bolts symmetrically. Torque, install four adjustment bolts into the corresponding screw holes of the rotor concentricity adjustment tool (7), adjust the positions of the four adjustment bolts so that the distances between the four evenly distributed points on the inner circle of the rotor concentricity adjustment tool (7) and the four evenly distributed points on the outer circle of the shaft sleeve (8) are basically equal, use a vernier caliper to detect the values of these four distances and record them as A, B, C and D respectively. The error of the four values is required to be no more than 0.03 mm. If the requirement is not met, continue to fine-tune the adjustment bolts until the requirement is met, thereby confirming that the center of the shaft is basically coincident with the center of the bearing chamber of the N-end end cover of the motor; Step 8. Align the center hole of the pressure cylinder (18) with the support screw (15) and four evenly spaced adjustment bolts, and then pass the adjustment bolts until the pressure cylinder (18) touches the outer surface of the bearing sleeve. Align the center holes of the hollow pump head of the hydraulic pump (14) and the outer ring baffle plate (13) of the bearing extraction unit with the support screw (15), and then tighten them in place with hexagonal nuts. Start the hydraulic pump (13) and press the bearing sleeve (11) with the outer ring of the column bearing (9) into the bearing chamber as a whole. When the hydraulic pump pressure gauge reaches 10 MPa, release the pressure, remove the outer ring baffle plate (13), the hydraulic pump (14) and the pressure cylinder (18); remove the rotor coaxiality adjustment tool (7) from the N-end end cover (1-3) of the motor, remove the support screw (15) from the shaft sleeve (8), and remove the shaft sleeve from the N-end shaft (1-2-1); Step 9. After adding grease to the oil reservoir of the N-end bearing cover (5) as required, align the bearing cover seal gasket with the through hole position and stick it to the bearing cover mating surface. Then align the two as a whole and install them on the end cover (1-3) after aligning the mounting screw holes of the motor N-end end cover. Tighten the bolts symmetrically and tighten them to the required torque value and mark the anti-loosening mark. Install the test gear disc (4) on the N-end shaft (1-2-1) as required. Finally, align the speed sensor seat (3) and the motor N-end end cover (1-3) mounting screw holes, install it on the end cover, tighten the bolts symmetrically and tighten them to the required torque value and mark the anti-loosening mark. Finally, complete the motor disassembly-free N-end column bearing replacement operation.