Method for pressing a generator stator core

Abstract

The present application relates to a kind of generator stator core press mounting method.By executing the steps of generator stator core press mounting method, stator core is divided into first section glue mounting core, multiple section intermediate press mounting core and tail section glue mounting core, and different press mounting means is used respectively, so that the pre-press height adjustment space is larger, and the threaded pull rod assembly and upper tooth pressure plate of stator core original are used, the problem that stator core is stacked in the top end part close to design height and cannot be pre-pressed tightly in real time is solved, the difficulty of stator core press mounting is reduced, and the press mounting quality of generator stator core is stable and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of generator processing, in particular to a method for press-fitting a generator stator core. Background Art

[0002] The stator core is a crucial component of a hydro-turbine generator and a key element of the magnetic circuit. It is typically constructed from 0.5mm thick sector-shaped sheets stacked one by one, compressed and held together by threaded tie rods and toothed pressure plates. During operation, the core is subject to a combination of electromagnetic forces, thermal stress, and mechanical forces. To ensure the quality of the stator core's press-fit and prevent loosening and increased losses, the stacking coefficient is typically no less than 0.96.

[0003] Traditional medium and large hydro-turbine generator stator cores generally adopt the bonding technology of the first and last sector sheets. The first and last stator cores must be immediately pressed and baked after glue coating and stacking. The middle part generally adopts the method of multiple pre-pressing. Or during the assembly process, the height and number of pre-pressing are allocated according to the actual assembly needs to ensure the stacking quality of the stator core.

[0004] However, traditional generator stator core press-assembly methods have the following problems: First, the stator core's pre-compression height can only be the distance between the two stator frame ring plates at any one time, leaving little room for adjustment; second, pre-compression cannot be performed when the stator core stack is near the top of the designed height. Consequently, traditional generator stator core press-assembly methods suffer from unstable press-assembly quality and difficulty. Summary of the Invention

[0005] Based on this, it is necessary to provide a generator stator core press-assembly method with stable and reliable press-assembly quality and simple operation.

[0006] A method for press-assembling a generator stator core comprises the following steps:

[0007] Place the lower gear pressure plate on the lower ring plate of the stator frame;

[0008] Applying glue layer by layer on the lower tooth pressure plate to stack multiple silicon steel sheets to obtain a first section of glued silicon steel segments;

[0009] Placing the upper pressing plate on the first glued silicon steel section, and locking the two ends of the pre-stressing tie rod assembly on the upper pressing plate and the lower ring plate respectively, so as to press the first glued silicon steel section to a first preset height;

[0010] The first glued silicon steel section is heated after being pressed to bake and cure the adhesive to obtain the first glued iron core;

[0011] Loosen the pre-compression rod assembly and remove the upper pressure plate;

[0012] Stacking a plurality of silicon steel sheets layer by layer on the first section of glued iron core, and placing a lower pressing plate, a pre-pressing mechanism and an upper pressing plate on the plurality of silicon steel sheets in order from bottom to top;

[0013] Locking the two ends of the pre-stressing tie rod assembly on the upper pressing plate and the lower ring plate respectively, and using the pre-stressing mechanism to pre-stress the plurality of silicon steel sheets for a preset time period to obtain a middle section press-fit core;

[0014] Remove the pre-stressing pull rod assembly, the upper pressing plate, the lower pressing plate and the pre-stressing mechanism;

[0015] Returning to the step of stacking a plurality of silicon steel sheets layer by layer and repeatedly performing the step of removing the pre-stressing tie rod assembly, the upper pressing plate, the lower pressing plate, and the pre-stressing mechanism a preset number of times, and stacking and press-fitting a plurality of middle press-fit cores in sequence from bottom to top to obtain an intermediate press-fit core;

[0016] Applying glue piece by piece and layer by layer on the middle press-fit core to stack a plurality of silicon steel sheets to obtain a tail-section glued silicon steel section;

[0017] Placing an upper tooth pressure plate on the tail section adhesive silicon steel section, and using the two ends of the original threaded tie rod assembly of the stator core to respectively lock the upper tooth pressure plate and the lower ring plate to press the tail section adhesive silicon steel section to a second preset height;

[0018] The tail section glued silicon steel section after press-fitting is heated to bake and solidify the adhesive to obtain the tail section glued iron core.

[0019] The above-mentioned generator stator core press-fitting method uses the pre-stressing tie rod assembly to provide opposite pulling forces to the lower ring plate and the upper pressure plate respectively, so as to press the first section of the glued silicon steel section between the upper pressure plate and the lower ring plate, thereby realizing the press-fitting of the first section of the glued iron core; uses the original tie rod assembly to provide opposite pulling forces to the upper pressure plate and the lower ring plate respectively, so as to position the pre-stressing mechanism and the lower pressure plate on the multiple stacked silicon steel sheets, and then uses the pre-stressing force provided by the pre-stressing mechanism to press the stacked silicon steel sheets. Perform pre-pressing to obtain a middle-section press-fit core with good press-fit quality; repeat the press-fitting steps of the middle-section press-fit core a preset number of times to obtain the middle press-fit core by segmented press-fitting; use the original threaded tie rod assembly of the stator core to provide opposite pulling forces to the upper tooth pressure plate and the lower ring plate of the stator core respectively, so as to press the last section of the glued silicon steel section between the upper tooth pressure plate and the lower tooth pressure plate, thereby realizing the press-fitting of the tail-section glued core and the press-fitting of the entire stator core at the same time. In this way, the stator core is divided into the first-section glued core, the multi-section middle-section press-fit core and the tail-section glued core, and different press-fitting methods are used respectively, so that the pre-pressing height adjustment space is large, and the original threaded tie rod assembly and the upper tooth pressure plate of the stator core are used to solve the problem of not being able to perform the pre-pressing operation in real time when the stator core is stacked close to the top part of the design height, thereby reducing the difficulty of pressing the stator core and making the press-fitting quality of the generator stator core stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic flow chart of a method for press-assembling a generator stator core according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The schematic diagram of the state of the engine stator core press-fitting method when the first section of the glue-fitted core is press-fitted;

[0022] Figure 3 for Figure 1 The schematic diagram of the state of the engine stator core press-fitting method when the remaining middle-section press-fitting cores except for a section of the middle-section press-fitting core adjacent to the tail-section glue-fitting core are press-fitted;

[0023] Figure 4 for Figure 1 The diagram shows a state diagram of the engine stator core press-fitting method when the middle press-fit core at one end adjacent to the tail glue-fit core is press-fitted.

[0024] Explanation of reference numerals: 100, stator core press-fitting device; 110, lower tooth pressure plate; 120, lower ring plate; 130, upper pressure plate; 140, pre-stressing rod assembly; 141, pre-stressing threaded rod; 142, pre-stressing nut; 143, pre-stressing gasket; 150, lower pressure plate; 160, pre-stressing mechanism; 161, mechanical jack; 162, pre-stressing pad; 170, adjusting bolt; 180, middle layer ring plate; 190, upper ring plate; 20, first section glued core; 30, middle section press-fit core. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also exist. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or one or more intervening elements may also exist.

[0028] In the case of using “including,” “having,” and “comprising” described herein, another component may be added unless a clear limiting term such as “only,” “consisting of,” etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as having one number.

[0029] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0030] See also Figure 1 A method for pressing a generator stator core provided by one embodiment of the present invention includes steps S1 to S12.

[0031] Please also refer to Figure 2 , step S1, placing the lower gear pressure plate 110 on the lower ring plate 120 of the stator base.

[0032] Step S2: glue-coating and stacking a plurality of silicon steel sheets on the lower tooth pressure plate 110 layer by layer to obtain a first section of glued silicon steel segments.

[0033] In step S3, the upper pressing plate 130 is placed on the first glued silicon steel section, and both ends of the pre-stressing rod assembly 140 are locked on the upper pressing plate 130 and the lower ring plate 120 respectively to press the first glued silicon steel section to a first preset height.

[0034] Step S4 , heating the compressed first glued silicon steel section to bake and solidify the adhesive, thereby obtaining the first glued iron core 20 .

[0035] When executing step S2, the number of silicon steel sheets can be freely selected according to design requirements, as long as the height of the first section of glued core 20 obtained in step S4 can meet the design requirements.

[0036] Step S5 , loosen the pre-compression rod assembly 140 and remove the upper pressing plate 130 .

[0037] Please also refer to Figure 3 In step S6, a plurality of silicon steel sheets are stacked layer by layer on the first section of the glued iron core 20, and a lower pressing plate 150, a pre-pressing mechanism 160 and an upper pressing plate 130 are placed on the plurality of silicon steel sheets in order from bottom to top.

[0038] In step S7 , the two ends of the pre-stressing rod assembly 140 are respectively locked on the upper pressing plate 130 and the lower ring plate 120 , and the pre-stressing mechanism 160 is used to pre-stress the plurality of silicon steel sheets for a preset time period to obtain the middle section press-fit core 30 .

[0039] In step S8 , the pre-pressing rod assembly 140 , the upper pressing plate 130 , the lower pressing plate 150 and the pre-pressing mechanism 160 are removed.

[0040] Please also refer to Figure 4 , step S9, return to repeat the steps of stacking multiple silicon steel sheets layer by layer to the step of removing the pre-stressing rod assembly 140, the upper pressure plate 130, the lower pressure plate 150, and the pre-stressing mechanism 160 for a preset number of times, so as to stack and press multiple middle-section press-fit cores 30 in sequence from bottom to top to obtain an intermediate press-fit core.

[0041] That is, step S9 is to return to repeating steps S6 to S8 a predetermined number of times to obtain an intermediate press-packed core formed by stacking and press-packing multiple intermediate press-packed cores 30 by segmented press-packing. The number of silicon steel sheets stacked in step S6 can be freely selected as needed, as long as the height of the intermediate press-packed core obtained in step S9 meets the design requirements. Furthermore, the number of silicon steel sheets can be the same or different each time step S6 is performed during the execution of steps S6 to S9.

[0042] Step S10: glue-coating and stacking a plurality of silicon steel sheets on the middle press-fit core layer by layer to obtain a tail-section glued silicon steel segment.

[0043] Step S11, placing an upper tooth pressure plate on the tail section adhesive silicon steel section, and using the two ends of the original threaded pull rod assembly of the stator core to lock the upper tooth pressure plate and the lower ring plate 120 respectively, so as to press the tail section adhesive silicon steel section to a second preset height.

[0044] Step S12, heating the press-assembled tail section glued silicon steel section to bake and cure the adhesive to obtain the tail section glued iron core.

[0045] By executing steps S1 to S12, the generator stator core is press-assembled in sections and assembled as a whole. Specifically, by executing steps S1 to S5, the first section of the glued core 20 is press-assembled; by executing steps S6 to S9, the middle section of the press-assembled core is press-assembled in sections; and by executing steps S10 to S12, the final glued core is press-assembled.

[0046] When executing steps S1 to S5, the pre-stressing rod assembly 140 is used to provide opposite pulling forces to the lower ring plate 120 and the upper pressure plate 130 respectively, so as to press the first section of the glued silicon steel section between the upper pressure plate 130 and the lower ring plate 120, thereby realizing the press-fitting of the first section of the glued iron core 20; when executing steps S6 and S7, the original rod assembly is first used to provide opposite pulling forces to the upper pressure plate 130 and the lower ring plate 120 respectively, so as to position the pre-stressing mechanism 160 and the lower pressure plate 150 on the multiple silicon steel sheets stacked, and then the pre-stressing mechanism 160 is used to provide the pre-stressing mechanism 160 to press the stacked silicon steel sheets. The placed silicon steel sheets are pre-pressed to obtain a middle press-fit core 30 with good press-fitting quality; when executing step S9, the press-fitting steps of the middle press-fit core 30 are returned and repeated to obtain the middle press-fit core by segmented press-fitting; when executing steps S10 to S12, the original threaded pull rod assembly of the stator core is used to provide opposite pulling forces to the upper tooth pressure plate and the lower ring plate 120 of the stator core respectively, so as to press the last section of the glued silicon steel section between the upper tooth pressure plate and the lower tooth pressure plate 110, thereby realizing the press-fitting of the tail section of the glued core and the press-fitting of the entire stator core.

[0047] In this way, the stator core is divided into a first-section glue-mounted core 20, a multi-section middle-section press-mounted core 30 and a tail-section glue-mounted core, and different pressing methods are adopted respectively, so that the pre-stressing height adjustment space is larger, and the original threaded pull rod assembly and upper tooth pressure plate of the stator core are used to solve the problem of not being able to perform real-time pre-tightening operation when the stator core is stacked close to the top part of the design height, thereby reducing the difficulty of pressing the stator core and making the pressing quality of the generator stator core stable and reliable.

[0048] Furthermore, while the tail section glued core is being pressed, the upper tooth pressure plate, pre-stressing rod assembly 140, lower tooth pressure plate 110, stator frame and core in the generator stator core can be assembled conveniently and quickly.

[0049] Please refer again Figure 3 and Figure 4 In some embodiments, the upper pressing plate 130 includes a plurality of fan-shaped upper pressing sub-plates spaced apart along the annular direction. Each upper pressing sub-plate is provided with a locking through hole and an adjusting screw hole, and the locking through hole is located outside the adjusting screw hole.

[0050] The steps of respectively locking the two ends of the prestressing rod assembly 140 to the upper pressure plate 130 and the lower ring plate 120 include: respectively locking one end of the plurality of prestressing rod assemblies 140 to the plurality of locking through holes, and respectively locking the other ends to the plurality of tightening through holes on the lower ring plate 120; providing a plurality of adjustment bolts 170, respectively screwing one end of the plurality of adjustment bolts 170 to the plurality of adjustment screw holes, and respectively abutting the lower ring plate 120, the intermediate ring plate 180, or the upper ring plate 190 of the stator frame at one end. The number of locking through holes and the number of adjustment screw holes on each upper pressure plate can be the same or different, and can be one or more.

[0051] Specifically, in step S3, the other end of each adjusting bolt 170 abuts against the lower ring plate 120. In steps S7 and S11, the other end of each adjusting bolt 170 abuts against the middle ring plate 180 or the upper ring plate 190 of the stator frame. More specifically, when press-fitting the middle press-fit core preceding the last glue-fit core, the adjusting bolt 170 abuts against the upper ring plate 190. When press-fitting the remaining middle press-fit cores, the adjusting bolt 170 abuts against the middle ring plate 180.

[0052] It should be noted that the tightening through-holes on the lower ring plate 120 are original structural holes on the stator frame, which are used for installing the threaded tie rod assembly when assembling the generator stator core.

[0053] Specifically, the spacing between two adjacent upper pressing plates is 6 mm to 10 mm to ensure that the multiple upper pressing plates can be pressed flatly on the multiple stacked silicon steel sheets during the press-fitting process and form an upper pressing plate 130 with a complete circle structure.

[0054] The adjusting bolt 170 and the pre-stressing rod assembly 140 on the same upper pressing plate form a lever structure, so that the lever principle can be used to adjust the press-fitting flatness of the upper pressing plate 130 to improve the flatness of the press-fitted iron core, thereby further improving the press-fitting quality.

[0055] At the same time, the lever structure formed by the adjusting bolt 170 and the prestressing rod assembly 140 on the same upper press plate can ensure high press-fitting quality even if the prestressing rod assembly 140 is located outside the stator core.

[0056] Furthermore, in some embodiments, the lower pressing plate 150 includes a plurality of lower pressing sub-plates spaced apart along an annular direction, and the number of the lower pressing sub-plates is the same as that of the upper pressing sub-plates, and the number of the lower pressing sub-plates corresponds to the number of the upper pressing sub-plates. In the step of sequentially placing the lower pressing plate 150, the pre-pressing mechanism 160, and the upper pressing plate 130 on the plurality of silicon steel sheets from bottom to top, at least one pre-pressing mechanism 160 is placed on each lower pressing sub-plate.

[0057] Specifically, the spacing between two adjacent lower pressing plates is 6 mm to 10 mm, to ensure that the multiple lower pressing plates can be pressed flatly on the multiple stacked silicon steel sheets during the press-fitting process and form a lower pressing plate 150 with a complete circle structure.

[0058] Specifically, a plurality of pre-pressing mechanisms 160 are placed on each lower pressing plate 150. More specifically, a plurality of pre-pressing mechanisms 160 are evenly distributed on each lower pressing sub-plate.

[0059] In this way, each lower pressure plate 150, upper pressure plate 130, the pre-pressing mechanism 160 therebetween, the pre-pressing rod assembly 140 and the adjusting bolt 170 together constitute a pressing unit for the middle section press-fitted core 30, and the pressing work of the middle section press-fitted core 30 is completed by multiple pressing units arranged at circumferential intervals along the stator core. This can not only ensure that multiple silicon steel sheets are subjected to a larger pre-pressure during the pressing process, but also ensure a higher pressing flatness during the pressing process, so as to further improve the pressing quality.

[0060] In some embodiments, when the ends of the pre-stressing rod assembly 140 are respectively locked to the upper pressure plate 130 and the lower ring plate 120, the pre-stressing rod assembly 140 is located in the core slot of the stator core. When the ends of the threaded rod assembly are respectively locked to the upper toothed pressure plate and the lower ring plate 120, the threaded rod assembly is located in the core slot of the stator core.

[0061] In this way, when performing the pre-stressing work on the first-section glue-mounted core 20 and the middle-section press-mounted core 30, the two ends of the pre-stressing rod assembly 140 are respectively locked with the middle parts of the upper pressure plate 130 and the lower ring plate 120; when performing the pre-stressing work on the tail-section glue-mounted core, the two ends of the original threaded rod assembly are respectively locked with the middle parts of the upper tooth pressure plate and the lower ring plate 120, so that the force-bearing part is near the center position of the stator core, so as to further ensure the pressing quality of the stator core.

[0062] At the same time, because the threaded pull rod assembly passes through the core slot of the stator core, the threaded pull rod is far away from the outer edge of the stator core and close to the holding part of the stator core. Even when the stator core is stacked at a high height, the clamping effect on the stator core holding part is still very good, which is conducive to further improving the quality reliability of the stator core press-fitting.

[0063] In some embodiments, when the first glued silicon steel section is compressed to the first preset height, the pre-compression rod assembly 140 uses a first rod, that is, both ends of the first rod are locked with the upper pressing plate 130 and the lower ring plate 120 respectively.

[0064] In the step of respectively locking the ends of the prestressing rod assembly 140 to the upper platen 130 and the lower ring plate 120, and prestressing the plurality of silicon steel sheets for a preset period of time using the prestressing mechanism 160, the prestressing rod assembly 140 uses a second rod. That is, the ends of the second rod are respectively locked to the upper platen 130 and the lower ring plate 120.

[0065] Wherein, the length of the first pull rod is smaller than the length of the second pull rod.

[0066] A large number of pre-stressing tie rod assemblies 140 are required during the entire stator core press-fitting process, and first tie rods and second tie rods of different lengths are adaptively selected in different steps to achieve the purpose of cost saving.

[0067] In some embodiments, when the middle section of the press-fit core 30 is pressed before the last section of the glue-fit core, the pre-pressing mechanism 160 uses a pre-pressing pad 162. When the middle sections of the press-fit core 30 are pressed before the middle section of the press-fit core 30 is pressed before the first section of the glue-fit core 20, the pre-pressing mechanism 160 uses a mechanical jack.

[0068] Because when press-fitting multiple middle-section press-fitted cores 30 close to the first-section glue-fitted core 20, the pre-stressing height adjustment space is relatively large, the pre-stressing mechanism 160 can use a mechanical jack 161 to provide a larger pre-stressing force during the press-fitting process to ensure the press-fitting quality; when press-fitting the middle-section press-fitted core 30 before the tail-section glue-fitted core, the pre-stressing height adjustment space is already very small, and the mechanical jack 161 cannot be used to perform the pre-stressing work. At this time, the mechanical jack 161 is replaced by a pre-stressing pad 162, so that high-quality press-fitting of a middle-section press-fitted core 30 close to the tail-section glue-fitted core can be achieved within the limited pre-stressing height adjustment space.

[0069] Of course, in other embodiments, the pre-compression mechanism 160 may also be a combination of a mechanical jack 161 and a pre-compression pad 162 .

[0070] In some embodiments, a plurality of first avoidance notches are formed circumferentially at intervals along the outer edge of the upper pressing plate 130. The first avoidance notches are used to avoid positioning ribs or ribs on the stator base. A plurality of second avoidance notches are formed circumferentially at intervals along the outer edge of the lower pressing plate 150. The second avoidance notches are used to avoid positioning ribs or ribs on the stator base.

[0071] In this way, the setting of the first avoidance gap and the second avoidance gap can ensure that the upper pressure plate 130 and the lower pressure plate 150 can avoid the interference of the positioning ribs or rib plates, which is conducive to the bottom surface of the lower pressure plate 150 to fully fit with the silicon steel sheet. The upper pressure plate 130 can extend to the ring plate of the stator base, so that the stator core can be pre-pressed at each ring plate position of the stator base, so that it can be suitable for the press-fitting work of the stator core of the generator whose stator base has rib plates or positioning ribs, and has high applicability.

[0072] In some embodiments, the pre-stressing rod assembly 140 includes a pre-stressing threaded rod 141 and a pre-stressing nut 142 and a pre-stressing washer screwed to both ends of the pre-stressing threaded rod 141 .

[0073] When a locking through hole is opened on the upper pressure plate 130, and the two ends of the prestressing rod assembly 140 are respectively locked with the upper pressure plate 130 and the lower ring plate 120, the two ends of the prestressing threaded rod 141 are respectively passed through the locking through hole and the original tightening through hole on the lower ring plate 120, and the prestressing gasket 143 is respectively put on the prestressing threaded rod 141 from the upper direction of the lower pressure plate 150 and the prestressing nut 142 is screwed on, and the prestressing gasket 143 is put on one end of the prestressing threaded rod 141 from the lower direction of the lower ring plate 120 and the prestressing nut 142 is screwed on, so that the prestressing nut 142 is screwed on to lock the prestressing threaded rod 141, which is simple and convenient to operate.

[0074] Of course, in other embodiments, the pre-stressing rod assembly 140 can also be locked with the upper pressure plate 130 and the lower ring plate 120 respectively by other means, using locking holes, locking teeth or locking grooves arranged along the axial direction at both ends of the pre-stressing rod, and then using locking shaft parts that cooperate with the locking holes and locking structures that cooperate with the locking teeth or locking grooves for locking.

[0075] In some embodiments, when the ends of the prestressing rod assembly 140 are respectively fastened to the upper pressure plate 130 and the lower ring plate 120, a prestressing tube is installed over one or both ends of the prestressing threaded rod 141. The prestressing tube is clamped between the prestressing nut 142 and the upper surface of the upper pressure plate 130 and / or between the prestressing nut 142 and the lower surface of the lower ring plate 120. Specifically, the prestressing tube is a seamless steel tube with a wall thickness greater than or equal to 5 mm. This allows the prestressing height of the stator core to be adjusted via the prestressing tube if the prestressing threaded rod 141 is too long, further improving the prestressing quality.

[0076] Specifically, the staff can ensure the pre-pressing height position in each pressing step by selecting pre-pressing tubes of different heights or different numbers of pre-pressing tubes.

[0077] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for press-fitting a generator stator core, characterized in that: Including steps: Place the lower gear pressure plate on the lower ring plate of the stator frame; Applying glue layer by layer on the lower tooth pressure plate to stack multiple silicon steel sheets to obtain a first section of glued silicon steel segments; Placing the upper pressing plate on the first glued silicon steel section, and locking the two ends of the pre-stressing tie rod assembly on the upper pressing plate and the lower ring plate respectively, so as to press the first glued silicon steel section to a first preset height; The first glued silicon steel section is heated after being pressed to bake and cure the adhesive to obtain the first glued iron core; Loosen the pre-compression rod assembly and remove the upper pressure plate; Stacking a plurality of silicon steel sheets layer by layer on the first section of glued iron core, and placing a lower pressing plate, a pre-pressing mechanism and an upper pressing plate on the plurality of silicon steel sheets in order from bottom to top; Locking the two ends of the pre-stressing tie rod assembly on the upper pressing plate and the lower ring plate respectively, and using the pre-stressing mechanism to pre-stress the plurality of silicon steel sheets for a preset time period to obtain a middle section press-fit core; Remove the pre-stressing pull rod assembly, the upper pressing plate, the lower pressing plate and the pre-stressing mechanism; Returning to the step of stacking a plurality of silicon steel sheets layer by layer and repeatedly performing the step of removing the pre-stressing tie rod assembly, the upper pressing plate, the lower pressing plate, and the pre-stressing mechanism a preset number of times, and stacking and press-fitting a plurality of middle press-fit cores in sequence from bottom to top to obtain an intermediate press-fit core; Applying glue piece by piece and layer by layer on the middle press-fit core to stack a plurality of silicon steel sheets to obtain a tail-section glued silicon steel section; Placing an upper tooth pressure plate on the tail section adhesive silicon steel section, and using the two ends of the original threaded tie rod assembly of the stator core to respectively lock the upper tooth pressure plate and the lower ring plate to press the tail section adhesive silicon steel section to a second preset height; The tail section glued silicon steel section after press-fitting is heated to bake and solidify the adhesive to obtain the tail section glued iron core.

2. The method for press-assembling the generator stator core according to claim 1, characterized in that: The upper pressing plate includes a plurality of fan-shaped upper pressing sub-plates spaced apart in an annular direction; each of the upper pressing sub-plates is provided with a locking through hole and an adjusting screw hole, and the locking through hole is located outside the adjusting screw hole; The steps of locking the two ends of the pre-stressing rod assembly on the upper pressure plate and the lower ring plate respectively include: locking one end of the multiple pre-stressing rod assemblies on the multiple locking through holes respectively and correspondingly, and locking the other ends on the multiple tightening through holes on the lower ring plate respectively; providing multiple adjustment bolts, screwing one end of the multiple adjustment bolts on the multiple adjustment screw holes respectively and correspondingly, and abutting the lower ring plate, middle layer ring plate or upper ring plate of the stator base at the other ends.

3. The method for press-assembling the generator stator core according to claim 2, characterized in that: The distance between two adjacent upper pressing plates is 6 mm to 10 mm.

4. The method for press-assembling the stator core of a generator according to claim 2, characterized in that: The lower pressing plate includes a plurality of lower pressing sub-plates spaced apart in a circular direction; and the number of the lower pressing sub-plates and the upper pressing sub-plates is the same and corresponds one to one; In the step of placing a lower pressing plate, a pre-pressing mechanism and an upper pressing plate in sequence from bottom to top on a plurality of silicon steel sheets, at least one pre-pressing mechanism is placed on each of the lower pressing plates.

5. The method for press-assembling the generator stator core according to claim 4, characterized in that: The distance between two adjacent lower pressing sub-plates is 6 mm to 10 mm.

6. The method for press-assembling a generator stator core according to claim 1, characterized in that: When the first adhesive silicon steel section is pressed to a first preset height, the pre-stressing tie rod assembly adopts a first tie rod; In the step of respectively locking the two ends of the prestressing rod assembly on the upper pressing plate and the lower ring plate, and using the prestressing mechanism to prestress the plurality of silicon steel sheets for a preset time period, the prestressing rod assembly adopts a second rod; Wherein, the length of the first pull rod is smaller than the length of the second pull rod.

7. The method for press-assembling a generator stator core according to claim 1, wherein: When the middle section of the core is press-fitted before the tail section of the glue-fitted core is press-fitted, the pre-pressing mechanism uses a pre-pressing pad; When press-fitting the multiple middle-section press-fit cores before the middle-section press-fit core before the first-section glue-fitted core, the pre-pressing mechanism adopts a mechanical jack.

8. The method for press-assembling a generator stator core according to claim 1, wherein: The outer edge of the upper pressing plate is formed with a plurality of first avoidance notches at intervals along the circumferential direction; the first avoidance notches are used to avoid the positioning ribs or rib plates on the stator base; the outer edge of the lower pressing plate is formed with a plurality of second avoidance notches at intervals along the circumferential direction; the second avoidance notches are used to avoid the positioning ribs or rib plates on the stator base; and / or When the two ends of the pre-stressing rod assembly are respectively locked with the upper pressure plate and the lower ring plate, the pre-stressing rod assembly is located in the core slot of the stator core; when the two ends of the threaded rod assembly are respectively locked with the upper tooth pressure plate and the lower ring plate, the threaded rod assembly is located in the core slot of the stator core.

9. The method for press-assembling a generator stator core according to claim 1, wherein: The prestressing rod assembly includes a prestressing threaded rod and a prestressing nut and a prestressing washer screwed to both ends of the prestressing threaded rod.

10. The method for press-assembling a generator stator core according to claim 9, wherein: When the two ends of the prestressing rod assembly are respectively locked on the upper pressure plate and the lower ring plate, a prestressing tube is sleeved on one end or both ends of the prestressing threaded rod, and the prestressing tube is clamped between the prestressing nut and the upper surface of the upper pressure plate and / or between the prestressing nut and the lower surface of the lower ring plate.

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