CN112531984A - Motor slot wedge withdrawing method and slot wedge withdrawing system device - Google Patents
Motor slot wedge withdrawing method and slot wedge withdrawing system device Download PDFInfo
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- CN112531984A CN112531984A CN202011294051.1A CN202011294051A CN112531984A CN 112531984 A CN112531984 A CN 112531984A CN 202011294051 A CN202011294051 A CN 202011294051A CN 112531984 A CN112531984 A CN 112531984A
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- slot wedge
- grooving
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention provides a motor slot wedge withdrawing method which comprises the following steps: the mode of grooving the slot wedge is adopted to reduce the strength and rigidity of the slot wedge, the binding force and the friction force between the slot wedge and the dovetail groove opening are reduced, and the slot wedge is easy to withdraw. The slot wedge withdrawing system device comprises a slot cutting device, an end limiting device, a depth adjusting device and a slot wedge withdrawing device, can avoid damaging an insulating layer of a winding in the slot cutting and slot wedge withdrawing processes, can withdraw a slot wedge without damage, greatly improves the slot wedge withdrawing efficiency, and reduces the maintenance cost of a motor.
Description
Technical Field
The invention belongs to the field of motor processing, and particularly relates to a motor slot wedge withdrawing method and a slot wedge withdrawing system device.
Background
The traction motor stator mainly comprises a winding, a slot wedge, an iron core and the like, wherein after the winding is embedded into an iron core slot, the slot wedge is embedded into a slot dovetail groove to fix the winding, then the slot wedge, a stator coil and the iron core are solidified into a whole after the stator is integrally treated by VPI paint dipping, and the slot wedge is required to be withdrawn under the condition that the insulation of the stator winding is not damaged during stator maintenance.
In the prior art, a method that a hand hammer is matched with a flat chisel to knock a slot wedge to withdraw is adopted, the slot wedge, a stator coil and an iron core are solidified into a whole, knocking out is difficult, the knocking direction is difficult to keep in the horizontal direction, the slight deflection can knock the insulation of a winding to cause insulation damage, the whole stator winding is scrapped, and the qualification rate of withdrawing the slot wedge is extremely low. Therefore, it is necessary to solve the following problems: the problem of the slot wedge being withdrawn without damaging the insulation of the stator winding.
Through patent retrieval, the following patents mainly exist, which have a certain relationship with the invention:
1. the invention belongs to the motor processing technology and discloses a slot wedge paper forming die for sealing a slot of a motor stator, which belongs to the Chinese invention patents of ' 201610185553.8 ' application number, ' 2016.03.29 ' application date, ' CN 105811672A ' publication number, ' 2016.07.27 ' name, ' slot wedge paper forming die for sealing a slot of a motor stator and ' Hangzhou nine-dimensional motor limited ' application date, wherein the slot wedge paper forming die for sealing a slot of a motor stator comprises a forming female die and a forming pressing block, a cavity of the forming female die is of a linear slot structure, and the cavity comprises a feeding area and a forming area; the width of the feeding area is not less than the width of the slot wedge paper before forming, the width of the forming area is not less than the width of the forming slot wedge paper before rebounding and is less than the width of the forming slot wedge paper after rebounding, the width of a transition area between the feeding area and the forming area is less than the width of the forming area, and two ends of the forming area are communicated; the inner side wall surface of the forming area is a forming concave surface matched with the surface shape of the forming slot wedge paper before rebounding, and the front end surface of the forming pressing block is a forming convex surface matched with the surface shape of the forming slot wedge paper before rebounding. The double-area cavity design provided by the invention not only can simplify a feeding mechanism before forming, but also can save the additional arrangement of a slot wedge paper clamping mechanism, and is beneficial to simplifying the structural composition of automatic forming wedge inserting equipment.
2. The invention discloses a process for assembling a stator slot wedge corrugated plate of a low-speed synchronous motor, which is a Chinese invention patent with the application number of 201710202803.9, the application date of 2017.03.30, the publication number of CN 106685162A and the publication date of 2017.05.17, is named as a process for assembling the stator slot wedge corrugated plate of the low-speed synchronous motor, and is applied to Shanghai electric group Shanghai Motor plant Limited company.
3. The invention discloses a method for preventing a stator slot wedge from loosening, which is applied to a large vertical generator, and relates to a method for preventing the stator slot wedge from loosening, which is named as CN201010542862.9, 2010.11.10, 102468720A and 2012.05.23, and is also named as a method for preventing the stator slot wedge from loosening of the large vertical generator. The stator slot wedge locking device aims to solve the defects that the stator slot wedge is loosened, the slot wedge, an in-slot wedge and a filler strip sink and fall off and the like due to poor slot wedge fixing effect in the running of a generator. The method comprises the following steps: preparing stator tapered slot wedges with three specifications for each stator slot, wherein the stator tapered slot wedges with each specification comprise an upper cover slot wedge and a lower insertion tapered wedge which are used in a matched mode; preparing adhesive glue, a semiconductor gasket strip and a corrugated gasket strip; cleaning stator slot wedges and stator slots by using industrial alcohol, punching middle slot wedges from bottom to top, then punching upper slot wedges, and finally punching lower slot wedges; the length dimension of the lower inserting wedge is shortened by 5mm compared with the length dimension of the upper cover slot wedge matched with the lower inserting wedge; coating adhesive glue on the assembly surfaces of the stator core notches corresponding to the upper section upper cover slot wedge, the lowest middle section upper cover slot wedge and the lower section upper cover slot wedge, and the assembly surfaces of the corresponding upper section lower insertion wedge, the lowest middle section lower insertion wedge and the lower section lower insertion wedge; and the other middle-section stator slot wedges are still directly tightened.
4. The invention discloses a slot wedge rolling forming device, which is a Chinese invention patent with the application number of CN200610070530.9, the application date of 2006.11.24, the publication number of CN101190448A, the publication date of 2008.06.04, the name of a slot wedge rolling forming device and the application name of 'Wangweikui'. The utility model provides a slot wedge rolling forming device, is equipped with the driven roll of round pin axle installation mainly by the layer board on, walk the initiative that cardboard and upside were equipped with and link to each other with the motor shaft and roll and form its characterized in that down: two circles of mutually matched bulges and grooves are arranged on the outer edges of the driving roller and the driven roller. The stator wedge is formed by cutting and punching, has stable shape, does not rebound, is not easy to turn over in the stator slot, and improves the quality and the service life of the stator.
5. The utility model relates to the technical field of motors, in particular to a magnetic slot wedge fixing structure of a stator of a centrifugal refrigeration motor, which comprises a stator coil, a stator punching sheet set, a magnetic slot wedge, a fixing rod and a binding belt, wherein the application number is 201721445095.3, the application date is 2017.11.02, the publication number is CN 207304208U, the publication date is 2018.05.01, the name is 'magnetic slot wedge fixing structure of a stator of a centrifugal refrigeration motor', and the application is 'Chongqing Hezhong electric industry limited company'; the stator punching sheet group is sleeved with a tubular roller, two ends of the tubular roller are fixedly provided with a mounting seat, the upper side of the mounting seat is provided with a thread fixing head of a fixing rod, and the lower side of the mounting seat is provided with a through hole structure so as to facilitate a stator coil to penetrate out; one side of the stator coil corresponding to the mounting seat is bound and fixed with the magnetic slot wedge through a binding belt; and the tip of the outer side of the stator coil is bound and fixed with the tip of the fixing rod. The structure can effectively prevent the magnetic slot wedge from loosening caused by expansion with heat and contraction with cold or vibration in long-term work, and can prolong the service life of the magnetic slot wedge.
6. The utility model provides an application number is "201821325458.4", application date is "2018.08.16", the publication number is "CN 208674970U", the publication date is "2019.03.29", the name is "slot wedge of axial magnetic field motor and stator core", the applicant is the utility model patent of "suitable reach power science and technology limited company" in Shanghai, this utility model provides a stator core's slot wedge, include the slot spout sliding fit's slot wedge main part with stator core, the width direction's of slot wedge main part both sides are provided with the direction slide rail that slides fit with the slot spout, the external diameter end of slot wedge main part be provided with the complex limited slip boss that clamps of slot spout. Pack into through the direction slide rail structure between slot wedge main part and the notch spout, the external diameter end of slot wedge main part sets up limited slip boss, and after the slot wedge main part was assembled into the position, limited slip boss clamped in the loading end of notch spout, through the structure that clamps of the loading end of limited slip boss and notch spout, it is spacing to carry out in the slot wedge main part working process, avoids the slot wedge atress to drop along stator core's radial roll-off, iron core and slot wedge mounting structure stability. The utility model discloses an axial magnetic field motor is still provided.
7. The utility model discloses an application number is "201822038025.7", application date is "2018.12.04", the publication number is "CN 209150837U", the publication date is "2019.07.23", the name is "a slot wedge, plastic envelope stator and plastic envelope motor", the applicant is "combine fertile Kebang motor Limited", this application relates to plastic envelope motor preparation technical field, especially relates to a slot wedge, plastic envelope stator and plastic envelope motor, including can insert stator module's stator inslot slot wedge body, the slot wedge body is provided with the slot wedge hole that is used for holding the sinle silk and is used for the restriction the sinle silk by the card line structure that the slot wedge hole deviates from. So set up, it is downthehole at the slot wedge to restrict the sinle silk through the card line structure to prevent that the sinle silk from deviating from by the slot wedge is downthehole because of the impact of plastic envelope material, and then make the sinle silk more firm with being connected of slot wedge body, and then be favorable to having promoted the performance of motor, reduced the manufacturing cost of motor.
8. The utility model discloses a be "CN 89213771.1", application date is "1989.07.13", the publication number is "CN 2052984U", the publication date is "1990.02.14", the name is "a neotype slot wedge storage ware and push rod", the applicant is the utility model patent of "the Shanghai electrical science institute of mechano-electronics industry portion", this utility model improves current structure, it has the recess of 1 x 0.5 square millimeter cross-section to open on the slot wedge storage ware, the two wings of the same cross-section of push rod both sides protrusion just in time with the recess sliding fit of storage ware, rely on the protruding wing to withstand the both sides of "concave" slot wedge, carry into the stator inslot smoothly to them.
9. The device comprises a frame and a support frame, wherein the device is a utility model patent with the application number of CN201020279156.5, the application date of 2010.08.03, the publication number of CN201877972U and the publication date of 2011.06.22, the name of the device is a motor slot wedge embedding device and the application person is 'Tanshiji science and technology company Limited in the development area of Tanzhou high and new technology industry'; a movable transverse adjusting device is arranged on the rack, a slot wedge embedded with a motor winding coil is arranged on the transverse adjusting device, and the slot wedge embedded with the motor winding coil can move on the rack through the transverse adjusting device; the position of the grooving can be adjusted through the movement of the transverse adjusting device, so that the purpose of positioning once and simultaneously inserting a plurality of wires is achieved; a power device for embedding the motor winding coil slot wedge is also arranged on the rack, one end of the power device is connected with the rack, the other end of the power device is connected with the transverse adjusting device, and a piston rod of the power device drives the transverse adjusting device and the embedded motor winding coil slot wedge to linearly move together when stretching; the motor stator is arranged on the support frame and is fixed by the positioning device.
10. The utility model discloses an application number is "CN 201120409440.4", application date is "2011.10.25", the publication number is "CN 202309299U", the publication date is "2012.07.04", the name is "the magnetic slot wedge of stator part improves the structure", the utility model discloses a utility model patent of "Hangzhou Fuchunjiang hydroelectric equipment limited company" is applied for, this utility model discloses a structure is improved to the magnetic slot wedge of stator part, including the stator punching, stator punching component inslot is equipped with down stator coil and last stator coil, goes up the stator coil and is equipped with the magnetic slot wedge, is equipped with a soft gasket strip in the space between magnetic slot wedge and last stator coil, soft gasket strip and last stator coil and magnetic slot wedge adhesive connection. This improve the effectual technology space that has eliminated between magnetic slot wedge and lower stator coil of structure, avoided the magnetic slot wedge can produce not hard up phenomenon of wearing and tearing after the long-time work of stator punching inslot, and insulating nature is good, and the motor security is high.
11. The utility model relates to a utility model patent of "stator rule is beaten slot wedge instrument and is improved device" CN201120506734.9 ", application date is" 2011.11.30 ", publication number is" CN202334198U ", publication date is" 2012.07.11 ", the name is" stator rule and beats slot wedge instrument and improve device ", the applicant is" Hunan Hanlong hydroelectric equipment limited company ", this utility model relates to a stator rule beats slot wedge instrument and improves device. The device mainly aims to solve the problem that when a stator of the hydraulic generator is embedded with a wire, a slot wedge can be well tightened, and the slot wedge cannot be broken. The head of the tool is provided with a right-angle notch; one side of the right-angle notch is a longer plane, and the other side of the right-angle notch is a narrower plane; the longer plane of the right-angle notch forms an included angle with the axis of the tool; the top of the right-angle notch is a tool withdrawal groove. The utility model discloses simple structure, processing is convenient, when the slot wedge is beaten to actual rule, not only can beat the slot wedge well tightly, and the slot wedge is also seldom beaten and is daggered, is cracked, can material saving, strikes the in-process moreover more laborsaving.
12. The utility model relates to a stator inserting line and slot wedge paper slot mechanism, which comprises a machine base, a mould needle seat, a mechanical pressure arm, a pressure arm rotation control device, a stator, a thread protecting mould, a paper pushing mould moving control device and a thread mould, wherein the paper mould, the thread mould and the stator can be respectively arranged at the upper end of the mould needle, when the paper mould is arranged at the upper end of the mould needle, the slot wedge paper in the paper mould is pushed into the mould needle through the paper pushing mould, when the thread mould is arranged at the upper end of the mould needle, the thread inserting line in the thread mould is manually pushed into the mould needle by an operator, when the stator is arranged at the upper end of the mould needle, the thread protecting mould is arranged at the upper end of the stator and is pressed tightly by the mechanical pressure arm, the lower end in the mould pin is provided with a slot wedge paper push block and a coil inserting push head, and the slot wedge paper push block and the coil inserting push head can move up and down under the control of a lifting device. The mechanism can automatically embed the whole motor stator coils (multiple groups) and slot wedge paper into stator slots simultaneously, thereby improving the production efficiency, reducing the labor intensity of workers, and having simple structure, convenient operation and low cost.
The above patents do not relate to a motor slot wedge withdrawing method and a system device, the slot wedge is difficult to withdraw, the slot wedge withdrawing efficiency is low, and the motor maintenance cost is high.
Disclosure of Invention
Aiming at the problem that the slot wedge is difficult to withdraw in the prior art, the technical problem to be solved by the invention is that the strength and the rigidity of the slot wedge are reduced by grooving the slot wedge, so that the slot wedge is easy to withdraw; meanwhile, the depth adjusting device and the end limiting device are adopted, the insulating layer of the winding is prevented from being damaged in grooving work, the efficiency of groove wedge retreating is improved, and the maintenance cost of the motor is reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a motor slot wedge withdrawing method is characterized in that a slot wedge is easy to deform in a mode of reducing the strength and rigidity of the slot wedge, so that the matching compactness and friction force of the slot wedge and a dovetail groove are reduced, and the slot wedge is convenient to withdraw.
Further, the strength and rigidity of the wedge is reduced by grooving the wedge. The mode of grooving the slot wedge is adopted to reduce the strength and rigidity of the slot wedge, the binding force and the friction force between the slot wedge and the dovetail groove opening are reduced, and the slot wedge is easy to withdraw. Meanwhile, the limiting plate is used for controlling the grooving depth, the winding insulating layer is prevented from being damaged in the grooving process, the efficiency of groove wedge retreating is greatly improved, and the maintenance cost of the motor is reduced.
Further, damage to the insulation of the winding is avoided by controlling the depth of the cut to be less than the thickness of the wedge.
Furthermore, the slot wedge withdrawing device is utilized to push against the slot wedge along the axial direction of the iron core, and the slot wedge withdrawing device is hammered, so that the slot wedge is withdrawn from the dovetail groove. The insulating layer of the winding can be prevented from being damaged in the slot wedge withdrawing process.
The motor slot wedge withdrawing method comprises the following steps:
the method comprises the following steps: according to the thickness of the slot wedge, adjusting the slot cutting depth of the slot cutting device to enable the slot cutting depth to be smaller than the thickness of the slot wedge;
step two: adjusting the limiting length of the end limiting device according to the distance between one end of the iron core and the end spigot of the stator, and installing the end limiting device;
step three: placing the grooving device into an inner cavity of the iron core, aligning a cutting blade of the grooving device to a block slot wedge in the iron core along the axial direction of the iron core for grooving, drawing back the grooving device after the grooving device touches an end limiting device, and then aligning adjacent slot wedges for grooving until all slot wedges are grooved;
step four: adjusting a slot wedge withdrawing device according to the distance between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core, so that the exposed height of the cutting edge is smaller than the distance between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core;
step five: the end limiting device is dismounted;
step six: aligning the chisel to the end part of the slot wedge along the axial direction of the iron core, respectively placing the depth limiting plates on the two sides of the chisel on the iron core on the two sides of the slot wedge, hammering the chisel along the axial direction of the iron core, withdrawing the slot wedge from the dovetail groove of the iron core by using the chisel, and repeating the operation until all the slot wedges 3 are withdrawn.
The invention provides a slot wedge withdrawing system device for realizing the motor slot wedge withdrawing method, which comprises a slot cutting device, an end part limiting device, a depth adjusting device and a slot wedge withdrawing device. The slot wedge can be withdrawn in a lossless manner by utilizing the slot wedge withdrawing system device, so that the slot wedge withdrawing efficiency is greatly improved, and the maintenance cost of the motor is reduced.
Further, including the groover device includes: the cutting device comprises a grinding wheel machine, a grooving support, a cutting piece, a limiting plate, a bolt and a nut; the cutting device grinding machine is fixed on the cutting support, and the cutting blade is rotationally connected to the grinding machine; the limiting plates are provided with waist-shaped holes, and the two limiting plates are respectively arranged on two sides of the grooving bracket; the bolt sequentially penetrates through the waist-shaped hole of the limiting plate on one side, the bolt hole of the grooving support and the waist-shaped hole of the limiting plate on the other side, is connected with the nut in a matched mode, and clamps the grooving support between the two limiting plates. The grooving depth can be controlled, and the winding insulation layer is prevented from being damaged in the grooving process.
Further, the end stop device includes: the stator comprises a limiting ring, a fixing plate, a limiting bolt and a limiting nut, wherein the fixing plate is connected to one end of the stator, and the limiting ring is connected with the fixing plate through the limiting bolt and the limiting nut. The end limiting device is used for blocking the grooving device for limiting so as to avoid damaging winding insulation during grooving.
Further, the depth adjusting device includes: the measuring device comprises a U-shaped frame, a measuring block and a locking bolt, wherein a measuring groove is formed in the U-shaped frame, the measuring block is long in strip shape, the width of the measuring block is smaller than the width of the measuring groove, the difference between the depth of the measuring groove and the height of the measuring block is larger than the depth of a cutting groove, the measuring block is adjusted to be equal to the depth of the cutting groove relative to the U-shaped frame, and the measuring block is locked in the measuring groove through the locking bolt. The height of the cutting blade in the grooving device extending out of the positioning plate can be accurately and conveniently adjusted by using the grooving depth adjusting device, the grooving depth can be accurately controlled, and the winding insulating layer is prevented from being damaged during grooving.
Further, the slot wedge withdrawing device comprises: the chisel, the two depth limiting plates and the bolt assembly; the cutting edge of the chisel is provided with a cutting edge raised edge, and the included angle alpha between the cutting edge raised edge and the straight edge of the chisel is 179.1 degrees; the two depth limiting plates are respectively arranged on two sides of the chisel, and the chisel is clamped between the two depth limiting plates through a bolt assembly; the exposed height of the cutting edge of the chisel is less than the distance between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core. The position height between the cutting edge and the winding is controlled by the slot wedge withdrawing device when the chisel pushes the slot wedge, so that the chisel is prevented from contacting the winding in the pushing process, and the insulating layer of the winding is prevented from being damaged.
The invention has the beneficial effects that: the mode of grooving the slot wedge is adopted to reduce the strength and rigidity of the slot wedge, the binding force and the friction force between the slot wedge and the dovetail groove opening are reduced, and the slot wedge is easy to withdraw. The system device comprising the grooving device, the end limiting device, the depth adjusting device and the slot wedge withdrawing device can avoid damaging an insulating layer of a winding in the grooving and the slot wedge withdrawing processes, can withdraw the slot wedge without damage, greatly improves the slot wedge withdrawing efficiency and reduces the maintenance cost of a motor.
Drawings
Figure 1 is a schematic diagram of a motor slot wedge structure,
FIG. 2 is a schematic sectional view A-A of FIG. 1,
figure 3 is a schematic view of a prior art groove retracting wedge scheme,
FIG. 4 is a schematic diagram of a conventional slot-withdrawing wedge damaging the insulation layer of a winding,
figure 5 is a schematic view of a motor slot wedge grooving scheme,
figure 6 is an enlarged view of a portion of figure 5,
FIG. 7 is a perspective view of the grooving apparatus,
figure 8 is a cross-sectional schematic view of the nicking apparatus,
figure 9 is a schematic perspective view of a slotted bracket,
figure 10 is a schematic view of a three-dimensional structure of a limiting block,
figure 11 is a schematic perspective view of the depth adjustment device,
figure 12 is a front view of the depth adjustment device,
figure 13 is a front view schematic diagram of a depth adjustment method,
figure 14 is a side view schematic diagram of a depth adjustment method,
FIG. 15 is a front view of the grooving apparatus,
figure 16 is a front view of the wedge after being grooved,
figure 17 is a schematic view of the end stop,
figure 18 is a schematic view of the front end of the end stop arrangement in perspective,
figure 19 is a rear perspective view of the end stop device,
figure 20 is a schematic cross-sectional view of an end stop,
figure 21 is a front view of the stop collar,
figure 22 is a schematic cross-sectional view of a stop collar,
figure 23 is a schematic view of a stop screw,
figure 24 is a schematic perspective view of the slot wedge withdrawing device in embodiment 1,
figure 25 is a schematic front view of an embodiment 1 of the slot wedge withdrawing device,
figure 26 is a schematic elevational view of the chipper,
figure 27 is an enlarged partial schematic view of figure 26,
figure 28 is a perspective view of a depth stop plate,
figure 29 is a schematic front view of an embodiment 2 of the slot wedge withdrawing device,
figure 30 is a schematic side view of embodiment 2 of the slot wedge removal device,
figure 31 is a schematic cross-sectional view of B-B of figure 29,
fig. 32 is a schematic diagram of the height-limiting bolt in fig. 31 after adjustment.
Figure 33 is a schematic front view of the slot wedge retracting method,
FIG. 34 is a schematic side view of the back wedge method.
In the figure: 1-iron core, 11-dovetail notch, 2-winding, 3-slot wedge, 31-slot, 4-slot cutting device, 41-cutting piece, 42-grinder, 43-lock nut, 44-slot cutting bracket, 441-shaft hole, 442-mounting screw hole, 443-cutting piece slot, 444-bolt hole, 45-bolt, 46-limit plate, 461-kidney hole, 47-nut, 5-end limit device, 51-limit ring, 511-limit screw hole, 52-limit screw, 521-limit connecting end, 522-length adjusting end, 53-limit nut, 54-fixing plate, 541-fixing screw hole, 6-depth adjusting device, 61-U-shaped frame, 611-measuring slot, 612-observing slot, 62-measuring block, 63-lock bolt, 7-slot wedge withdrawing device, 71-chisel, 711-screw hole, 712-cutting edge raising, 713-chisel, 72-depth limiting plate, 721-adjusting hole, 713-chisel edge raising, and chisel edge raising, 73-bolt assembly, 74-height limiting bolt and 75-height limiting nut; the method comprises the following steps of V-grooving direction, F-hammering direction, L-stator end and spigot distance, L1-limiting plate limiting distance, L2-end limiting device limiting length, L3-limiting thread length, L4-adjusting thread length, L5-limiting screw length, K1-dovetail notch width, K2-slot wedge width, K3-cutting blade width, K4-limiting plate width, K5-limiting plate inner side distance, K6-limiting plate outer side distance, K7-measuring block width, K8-measuring slot width, K9-U-shaped frame width, K10-chisel width, D-limiting ring diameter, H-limiting ring thickness, a-slot wedge thickness, D-grooving depth, H1-slot wedge bottom surface and iron core inner cavity surface distance, H2-measuring block height, H3-measuring slot depth, H4-exposed height and alpha-rake angle cutting edge.
Detailed Description
The invention is further described by the following specific embodiments in conjunction with the attached drawings:
the structure of the motor stator is shown in fig. 1 to 2: the slot wedge type winding machine mainly comprises an iron core 1, a winding 2, a slot wedge 3 and the like, wherein the slot wedge 3 is inserted into a dovetail groove of the iron core 1 to fix the winding 2 in a caulking groove of the iron core 1. When the motor needs to be taken out for maintenance, the slot wedge 3 used for fixing the winding 2 needs to be withdrawn from the dovetail groove of the notch of the iron core 1.
The existing wedge-withdrawing method is as shown in fig. 3 to 4: in the prior art, a method that a hand hammer is matched with a flat chisel to knock the slot wedge 3 to withdraw is adopted, and the slot wedge 3 is tightly matched with a dovetail groove and is difficult to withdraw; meanwhile, the knocking direction is difficult to keep in the horizontal direction, the insulation of the windings 2 can be knocked by slight deflection, so that the insulation is damaged, and the whole winding 2 is scrapped. Therefore, the qualification rate and the efficiency of the slot wedge withdrawing are extremely low, and the maintenance cost is high.
As shown in fig. 5 to 6: the invention provides a method and a system device for withdrawing a slot wedge and taking out a winding of a motor stator, aiming at solving the problems of withdrawing the slot wedge and taking out the winding under the condition of not damaging the insulation of a stator winding.
The slot wedge withdrawing method comprises the following steps: firstly, the strength and rigidity of the slot wedge 3 are reduced, so that the slot wedge 3 is easy to deform, the matching tightness and friction force of the slot wedge 3 and a dovetail groove are reduced, and finally the slot wedge 3 is withdrawn.
The slot wedge withdrawing system device comprises: the grooving device 4, the depth adjusting device 6, the end limiting device 5 and the slot wedge withdrawing device 7. A U-shaped cutting groove 31 with the width K3 and the depth d is cut on the slot wedge 3 by adopting a cutting groove device 4, so that the strength and the rigidity of the slot wedge 3 are reduced, the slot wedge 3 is easy to deform, the tightness and the friction force of the matching of the slot wedge 3 and a dovetail groove are reduced, and finally the slot wedge 3 is withdrawn by utilizing a slot wedge withdrawing device 7.
The nicking device 4, as shown in fig. 7 to 10, comprises: a cutting blade 41, a grinder 42, a lock nut 43, a notch holder 44, a bolt 45, a stopper plate 46, and a nut 47. The cutting groove bracket 44 is L-shaped, a shaft hole 441 and an installation screw hole 442 are formed on the L-shaped vertical plate, and a cutting piece groove 443 and a bolt hole 444 are formed on the L-shaped bottom plate. The bolts are connected to the grinder 42 through the mounting screw holes 442 to mount the grinder 42 to the slot bracket 44. The rotation shaft of the grinder 42 passes through the shaft hole 441, and the cutting blade 41 is mounted on the grinder 42 by means of the locking nut 43, with the cutting blade 41 protruding from the bottom of the cutting blade groove 443. The stopper plate 46 is provided with a kidney-shaped hole 461 corresponding to the bolt hole 444 of the slot bracket 44. The two limit plates 46 are respectively arranged at two sides of the grooving bracket 44, and the bolt 45 passes through the waist-shaped hole 461 of one limit plate 46, the bolt hole 444 and the waist-shaped hole 461 of the other limit plate 46 in sequence to be connected with the nut 47, thereby clamping the grooving bracket 44 in the middle. The height of the limiting plate 46 relative to the grooving bracket 44 is adjusted, so that the height of the cutting blade 41 extending out of the bottom of the limiting plate 46 is adjusted, and finally the purpose of adjusting the grooving depth d (the distance between the bottom surface of the grooving 31 and the upper surface of the wedge 3) is achieved. Blade width K3 is equal to the slot width of slot 31 and blade width K3 should be less than wedge 3 dovetail slot width K1 to avoid blade 41 damaging dovetail slot 11. Limiting plate width K4 should be less than slot wedge 3 forked tail notch width K1, still should be greater than grooving width K3, so that limiting plate 46 can enough put into the forked tail notch 11 of slot wedge 3, but can not get into in the grooving 31, make limiting plate 46 can slide along the upper surface of the slot wedge 3 behind the grooving, thereby avoid the limiting plate 46 of grooving device 4 one side to get into the grooving 31 in the back deepening the degree of depth of grooving 31, avoid cutting blade 41 to cut off the insulating layer of slot wedge 3 and damage winding 2. The spacing K6 between the outer sides of the limiting plates is larger than the width K1 of the dovetail groove, so that the limiting plates 46 are prevented from being clamped into the dovetail groove 11 for grooving, and grooving work is prevented from being influenced. The interval between the limiting plate 46 through adjustment both sides is the same with the interval of waiting to cut the adjacent both sides slot wedge 3 of slot wedge 3 for the limiting plate 46 of both sides can stretch into respectively in the adjacent both sides forked tail notch 11, make the limiting plate 46 of both sides shelve the slot wedge 3 top surface in both sides, when promoting groover 4 to carry out the grooving, the limiting plate 46 of both sides removes along the forked tail notch 11 of both sides, thereby control grooving degree of depth d and lead, make grooving 31 straight.
The limiting plates 46 on the two sides can also be placed on the surface of the inner cavity of the iron core 1, the surface of the inner cavity of the iron core 1 is used as a supporting and positioning surface of the grooving device 4, and the grooving depth d is controlled by controlling the height difference between the cutting blade 41 and the surface of the inner cavity of the iron core 1. The positioning mode does not need to adjust the distance between the limit plates 46 according to the distance between the slot wedges 3, and is more convenient.
The lower portion of the limit plate 46 is provided with a beveled edge so that the limit plate 46 can be inserted into the dovetail slot 11 in a direction perpendicular to the dovetail slot 11 so that the limit plate 46 can smoothly move along the dovetail slot 11.
The depth adjusting means 6, as shown in fig. 11 to 12, includes: u-shaped frame 61, measuring block 62 and locking bolt 63. The U-shaped frame 61 is provided with a U-shaped measuring groove 611, the measuring block (62) is in a long strip shape, the width K7 of the measuring block is smaller than the width K8 of the measuring groove, so that the measuring block 62 can be placed in the measuring groove 611, the difference between the depth h3 of the measuring groove and the height h2 of the measuring block is larger than the depth d of the cutting groove, namely h3-h2 > d, and therefore an adjusting space meeting the requirement of adjusting the depth of the cutting groove is provided. The height difference of the measuring block 62 relative to the top surface of the U-shaped frame 61 can be adjusted by adding a spacer to the bottom surface of the measuring groove 611. A U-shaped observation groove 612 is arranged in the direction perpendicular to the measurement groove 611, the measurement block 62 is placed in the measurement groove 611, the height of the measurement block 62 in the measurement groove 611 can be adjusted, and then the measurement block 62 is locked and fixed by the locking bolt 63.
The grooving depth adjusting method is shown in fig. 13 to 14: the grooving depth d is determined according to the wedge thickness a so that the grooving depth d is smaller than the wedge thickness a. Then the depth of the upper surface of the measuring block 62 with respect to the U-shaped frame 61 is measured with a height gauge so that the depth of the measuring block 62 with respect to the U-shaped frame 61 is equal to the depth d of the notch, and then the measuring block 62 is locked with a locking bolt 63. Then, the grooving device 4 is placed on the depth adjusting device 6, so that the cutting blade 41 is aligned with the measuring block 62, the limiting plates 46 at two sides are aligned with two sides of the U-shaped frame 61, and the nuts 47 are loosened, so that the limiting plates 46 at two sides of the cutting blade 41 can move up and down. The height of the cutting blade 41 is viewed from the side through the viewing groove 612, and when the cutting blade 41 comes into contact with the measuring block 62, the nuts 47 are tightened, thereby fixing the position restricting plates 46 at both sides of the cutting blade 41 such that the bottom height of the cutting blade 41 exposed to the position restricting plates 46 at both sides is equal to the cutting groove depth d.
The grooving process is illustrated in fig. 15 to 16: the grooving device 4 is placed in the internal control of the iron core 1, the cutting blade 41 is aligned to the middle position of one slot wedge 3 along the axial direction of the iron core 1, the limiting plates 46 on two sides are respectively placed on the slot wedges 3 adjacent to each other on the two sides, the grinding wheel 42 is started, and the grooving device 4 is pushed to cut along the axial direction of the iron core 1, so that a U-shaped grooving is cut in the middle of the slot wedges 3, the strength and the rigidity of the slot wedges 3 are reduced, and the slot wedges 3 can be conveniently withdrawn. The position of the grooving apparatus 4 is then adjusted so that the cutting blade 41 is aligned with the intermediate position of the non-grooved wedges 3 adjacent to the grooved wedge 3, and grooving is performed until all the wedges 3 are grooved.
The end stop 5 is shown in fig. 17 to 23, since the slot cutting device 4 controls the slot cutting depth by means of the stop 46 placed on the slot wedge 3, when the slot cutting device 4 moves to the end of the iron core 1, since the slot wedge 3 is not used to support the slot cutting device 4, the support slot cutting device 4 will cut the winding 2 exposing the iron core 1 under the action of the weight, and the winding 2 will be discarded. For this reason, it is necessary to limit the grooving range of the grooving apparatus 4. The end stop 5 is capable of limiting the grooving range of the grooving apparatus 4, and includes: a limit ring 51, a limit screw 52, a limit nut 53 and a fixing plate 54. The limiting ring 51 is a disc or a circular ring, the diameter D of the limiting ring is smaller than that of the inner cavity of the iron core 1, and a limiting threaded hole 511 connected with the limiting screw 52 is formed in the limiting ring 51. The fixing plate 54 is provided with a fixing screw hole 541, and the fixing plate 54 is fixedly connected to a spigot of an end portion of the stator by a bolt. The limit screw 52 is a double-threaded screw, and the limit thread length L3 for connecting with the limit ring 51 is smaller than the limit ring thickness H, so that the limit screw 52 is prevented from being exposed from the other side of the limit ring 51, and the limit deviation caused by the unevenness of the end surface of the limit ring 51 is avoided. The other end of the stopper screw 52 passes through the fixing plate 54, and the fixing plate 54 is fixed by two stopper nuts 53 from both sides of the fixing plate 54, respectively, thereby locking the end stopper limit length L2. The adjusting thread length L4 of the limiting screw 52 is longer, and the adjusting requirement of the limiting length L2 of the end limiting device can be met.
The end limiting method is shown in fig. 15: firstly, the distance L between one end of the iron core 1 and the end spigot of the stator and the limiting plate limiting distance L1 of the grooving device 4 are measured, and then the limiting length L2= L-L1 of the end limiting device is calculated. The stop nut 53 of the end stop 5 is then loosened and the distance between the stop collar 51 and the holding plate 54 is adjusted to equal the end stop length L2. And then the limiting ring 51 is extended into the inner cavity of the iron core 1 from one end of the motor, and the fixing plate 54 is fixed on the spigot at one end of the motor by using a bolt. When the grooving device 4 extends from the other end of the motor to the inner cavity of the iron core 1 and moves to perform grooving on the slot wedge 3 towards the end provided with the limiting ring 51, the limiting plate 46 of the grooving device 4 cannot move forwards when contacting the limiting ring 51, so that the grooving device 4 is prevented from cutting the winding 2, and the loss caused by the cutting is avoided.
The slot wedge withdrawing method is shown in fig. 31 to 32: firstly, the distance h1 between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core is measured, then the bolt assembly 73 of the slot wedge withdrawing device 7 is unscrewed, and the edge exposure height h4 of the edge warping edge 712 of the chisel 71 is adjusted to enable the edge exposure height h4 to be smaller than the distance h1 between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core, so that the insulating layer of the winding 2 is prevented from being damaged by the edge when the slot wedge is withdrawn. Then, the chisel 71 is aligned to the end part of the slot wedge 3 along the axial direction of the iron core, and the depth limiting plates 72 on two sides of the chisel 71 are respectively placed on the surfaces of the inner cavities of the iron core 1 on two sides of the slot wedge 3, so that the edge raised edge 712 of the chisel 71 is suspended and is not contacted with the winding 2. Finally, the chisel 71 is hammered in the axial direction of the iron core, and the wedge 3 is removed from the dovetail groove of the iron core 1 by the chisel 71. The above operation is repeated until all the wedges 3 have been withdrawn in order to take the winding 2 out for maintenance.
The motor slot wedge withdrawing method comprises the following steps:
the method comprises the following steps: according to the thickness a of the slot wedge, adjusting the slot cutting depth d of the slot cutting device 4 to enable the slot cutting depth d to be smaller than the thickness a of the slot wedge;
step two: adjusting the limiting length L2 of the end limiting device 5 according to the distance L between one end of the iron core 1 and the spigot of the end part of the stator, and installing the end limiting device 5;
step three: putting the grooving device 4 into the inner cavity of the iron core, aligning the cutting blade 41 of the grooving device 4 with the inner block slot wedge 3 along the axial direction of the iron core for grooving, pulling back the grooving device 4 after the grooving device 4 touches the end limiting device 5, and then aligning the adjacent slot wedges 3 for grooving until all the slot wedges 3 are grooved;
step four: adjusting the slot wedge withdrawing device 7 according to the distance h1 between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core, so that the exposed height h4 of the cutting edge is smaller than the distance h1 between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core;
step five: the end limiting device 5 is dismounted;
step six: aligning a chisel 71 to the end part of the slot wedge 3 along the axial direction of the iron core, respectively placing depth limiting plates 72 on two sides of the chisel 71 on the iron core 1 on two sides of the slot wedge 3, hammering the chisel 71 along the axial direction of the iron core, withdrawing the slot wedge 3 from the dovetail groove of the iron core 1 by using the chisel 71, and repeating the operation until all the slot wedges 3 are withdrawn.
In conclusion, the beneficial effects of the invention are as follows: the mode of grooving the slot wedge is adopted to reduce the strength and rigidity of the slot wedge, the binding force and the friction force between the slot wedge and the dovetail groove opening are reduced, and the slot wedge is easy to withdraw. The system device comprising the grooving device, the end limiting device, the depth adjusting device and the slot wedge withdrawing device can avoid damaging an insulating layer of a winding in the grooving and the slot wedge withdrawing processes, can withdraw the slot wedge without damage, greatly improves the slot wedge withdrawing efficiency and reduces the maintenance cost of a motor.
The above embodiments are provided for illustrative purposes only and not for limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, and therefore all equivalent technical solutions should fall within the scope of the invention, and the scope of the invention should be limited by the claims.
Claims (10)
1. A motor slot wedge withdrawing method is characterized in that: the slot wedge (3) is easy to deform in a mode of reducing the strength and the rigidity of the slot wedge (3), so that the matching tightness and the friction force of the slot wedge (3) and a dovetail groove are reduced, and the slot wedge (3) can exit conveniently.
2. The motor slot wedge exit method of claim 1, wherein: the strength and rigidity of the slot wedge (3) are reduced by grooving the slot wedge (3).
3. The motor slot wedge exit method of claim 2, wherein: damage to the insulation of the winding (2) is avoided by controlling the slot depth (d) to be less than the wedge thickness (a).
4. A motor slot wedge exit method according to claim 3, wherein: and the slot wedge withdrawing device is utilized to push the slot wedge (3) along the axial direction of the iron core (1), and the slot wedge withdrawing device is hammered, so that the slot wedge (3) withdraws from the dovetail groove.
5. The motor slot wedge exit method of claim 4, wherein: the method comprises the following steps:
the method comprises the following steps: adjusting the grooving depth (d) of the grooving device (4) according to the wedge thickness (a) so that the grooving depth (d) is smaller than the wedge thickness (a);
step two: adjusting the limiting length (L2) of the end limiting device (5) according to the distance (L) between one end of the iron core (1) and the end spigot of the stator, and installing the end limiting device (5);
step three: putting a grooving device (4) into an inner cavity of the iron core, aligning a cutting blade (41) of the grooving device (4) to a block wedge (3) in the grooving device along the axial direction of the iron core for grooving, pulling back the grooving device (4) after the grooving device (4) touches an end limiting device (5), and then aligning adjacent wedges (3) for grooving until all wedges (3) are grooved;
step four: adjusting a slot wedge withdrawing device (7) according to the distance (h 1) between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core, so that the exposed height (h 4) of the cutting edge is smaller than the distance (h 1) between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core;
step five: the end limiting device (5) is dismounted;
step six: aligning a chisel (71) to the end part of the slot wedge (3) along the axial direction of the iron core, respectively placing depth limiting plates (72) on two sides of the chisel (71) on the iron core (1) on two sides of the slot wedge (3), hammering the chisel (71) along the axial direction of the iron core, withdrawing the slot wedge (3) from a dovetail groove of the iron core (1) by using the chisel (71), and repeating the operation until all the slot wedges (3) are withdrawn.
6. A slot wedge withdrawing system device for realizing the motor slot wedge withdrawing method of any one of claims 1 to 5, wherein: comprises a grooving device (4), an end limiting device (5), a depth adjusting device (6) and a slot wedge withdrawing device (7).
7. The slot wedge ejecting system apparatus as claimed in claim 6, wherein: comprising a grooving apparatus (4) comprising: the cutting device comprises a grinding machine (42), a grooving support (44), a cutting piece (41), a limiting plate (46), a bolt (45) and a nut (47); the grinding machine (42) of the grooving device (4) is fixed on the grooving support (44), and the cutting blade (41) is rotationally connected to the grinding machine (42); the limiting plates (46) are provided with waist-shaped holes (461), and the two limiting plates (46) are respectively arranged at two sides of the grooving bracket (44); the bolt (45) sequentially penetrates through the waist-shaped hole (461) of the limiting plate (46) at one side, the bolt hole (444) of the grooving support (44) and the waist-shaped hole (461) of the limiting plate (46) at the other side, is matched and connected with the nut (47), and clamps the grooving support (44) between the two limiting plates (46).
8. The slot wedge ejecting system apparatus as claimed in claim 6, wherein: the end stop device (5) comprises: the stator comprises a limiting ring (51), a fixing plate (54), a limiting bolt (52) and a limiting nut (53), wherein the fixing plate (54) is connected to one end of the stator, and the limiting ring (51) is connected with the fixing plate (54) through the limiting bolt (52) and the limiting nut (53).
9. The slot wedge ejecting system apparatus as claimed in claim 6, wherein: the depth adjustment device (6) comprises: u-shaped frame (61), measuring block (62) and locking bolt (63), be provided with measuring groove (611) on U-shaped frame (61), measuring block (62) are rectangular shape, and measuring block width (K7) is less than measuring groove width (K8), and the difference of measuring groove depth (h 3) and measuring block height (h 2) is greater than grooving depth (d), and through adjusting measuring block (62) and being equal to grooving depth (d) for U-shaped frame (61), utilize locking bolt (63) to lock measuring block (62) in measuring groove (611).
10. The slot wedge ejecting system apparatus as claimed in claim 6, wherein: the slot wedge withdrawing device (7) comprises: a chisel (71), two depth stop plates (72) and a bolt assembly (73); the cutting edge of the chisel (71) is provided with a cutting edge warped edge (712), and the included angle between the cutting edge warped edge (712) and the straight edge (713) of the chisel is 179.1 degrees; the two depth limiting plates (72) are respectively arranged on two sides of the chisel (71), and the chisel (71) is clamped between the two depth limiting plates (72) through a bolt assembly (73); the exposed height (h 2) of the cutting edge of the chisel (71) is less than the distance (h 1) between the bottom surface of the slot wedge and the surface of the inner cavity of the iron core.
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| CN202011294051.1A CN112531984B (en) | 2020-11-18 | 2020-11-18 | Motor slot wedge withdrawing method and slot wedge withdrawing system device |
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