A method for fixing silicon steel sheets to the yoke of an AC transformer.

Abstract

This invention relates to a method for fixing silicon steel sheets for inserting the yoke into an AC transformer, belonging to the field of transformer manufacturing technology. It designs a dedicated fixture assembly for fixing the silicon steel sheets for inserting the yoke, including an adjustable I-beam structure, detachable thin square tubes, and fixing plates. The fixing plates are fixedly installed onto the pull plates of the three-phase core columns, using three sets of fixing plates. Two sets of adjustable I-beam structures are used, with the two thick square tubes of the two adjustable I-beam structures connected by a detachable thin square tube. A detachable thin square tube is inserted into the outer end of each of the two thick square tubes of the two adjustable I-beam structures. The upper yoke silicon steel sheets of the three phases are inserted simultaneously, vertically from top to bottom. While inserting the steel sheets, the position of the second thin square tube in the slider is adjusted synchronously, ensuring that the first thin square tube always presses firmly against the already inserted upper yoke silicon steel sheets until the insertion is complete. This invention effectively fixes the inserted silicon steel sheets, preventing overlap and tilting.

Description

Technical Field

[0001] This invention belongs to the field of transformer manufacturing technology, specifically relating to a method for fixing silicon steel sheets for inserting iron yokes into an AC transformer. Background Technology

[0002] After the coil assembly of an AC transformer is completed, silicon steel sheets for the upper yoke need to be inserted from the center of the main stage outwards to both sides. Currently, the production process uses straight square timber (2000mm long) and gantry-type fixtures for support. However, the current method of fixing the inserted silicon steel sheets in AC transformers is insufficient for relatively large cores (silicon steel sheet width greater than 520mm and length greater than 1500mm). Simply adding gantry-type fixtures is insufficient to completely secure the inserted silicon steel sheets, failing to meet the process requirements.

[0003] How to reduce operational deviations and improve the quality of inserting the silicon steel sheets into the yoke has become a technical problem that urgently needs to be solved in the production process of AC transformers. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for fixing the silicon steel sheets of the upper yoke in an AC transformer, which can effectively control the waviness and flatness of the upper yoke silicon steel sheets. The technical solution adopted by this invention is as follows:

[0005] A method for fixing silicon steel sheets to the yoke of an AC transformer includes the following steps:

[0006] Step 1: Design a dedicated fixture assembly for fixing silicon steel sheets with an inserted yoke. The fixture assembly includes: an adjustable I-beam structure, a detachable thin square tube, and a fixing plate. The adjustable I-beam structure includes: a first thin square tube, a second thin square tube, a thick square tube, and a slider. The first and second thin square tubes are integrally formed into a T-shape. The end of the second thin square tube furthest from the first thin square tube is movably connected to the thick square tube via the slider. The thick square tube has several first positioning holes. The slider is a cubic structure, with thin square tube through holes and thick square tube through holes staggered vertically within the slider. The through holes, thin square tube through holes, and thick square tube through holes intersect in a cross shape. A third positioning hole is set on the upper part of the slider, and the third positioning hole is connected to the thin square tube through hole. The fixing plate is a plate-shaped structure with several fixing and mounting holes vertically set from top to bottom on the fixing plate. An upper protruding support plate and a lower protruding support plate are set parallel to each other on the upper part of the fixing plate. The distance between the upper protruding support plate and the lower protruding support plate is greater than the side length of the cross-section of the detachable thin square tube. One end of the detachable thin square tube is inserted between the upper protruding support plate and the lower protruding support plate, and the other end of the detachable thin square tube is inserted into the thick square tube.

[0007] Step 2: Fix the fixing plates onto the tie plates of the three-phase core columns. A total of 3 sets of fixing plates are used, which are fixed onto the tie plates of phase A, phase B and phase C core columns respectively.

[0008] Step 3: Use two sets of adjustable I-beam structures. The two thick square tubes of the two sets of adjustable I-beam structures are connected by a detachable thin square tube. Insert a detachable thin square tube into the outer end of each of the two thick square tubes of the two sets of adjustable I-beam structures. Adjust the length of the detachable thin square tube to the appropriate position and tighten it with bolts.

[0009] Step 4: Insert the upper iron yoke silicon steel sheets of phases A, B and C simultaneously. Insert the upper iron yoke silicon steel sheets vertically from top to bottom. Adjust the position of the second thin square tube in the slider so that the first thin square tubes of the two sets of adjustable I-beam structures are pressed against the inserted upper iron yoke silicon steel sheets to prevent them from tipping over.

[0010] Step 5: While inserting the iron, simultaneously adjust the position of the second thin square tube in the slider so that the first thin square tube is always pressed tightly against the already inserted upper iron yoke silicon steel sheet, until the iron insertion work is completed.

[0011] The beneficial effects of this invention are:

[0012] The method for fixing the insert iron yoke and the fixing fixture assembly effectively secures the inserted silicon steel sheets, ensuring their straightness, reducing waviness from 4mm to no more than 2mm, and limiting the insert iron joint gap to no more than 3mm. It also prevents overlap and tilting of the silicon steel sheets. This fixing method and fixture assembly are simpler and faster, effectively improving the quality of the inserted irons. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some specific embodiments of the present invention. For those skilled in the art, other drawings falling within the scope of protection of this application can be obtained based on these drawings without any creative effort.

[0014] Figure 1 This is a flowchart of the fixing method according to an embodiment of the present invention;

[0015] Figure 2 This is a front view of the adjustable I-beam structure according to an embodiment of the present invention;

[0016] Figure 3 This is a cross-sectional view of the slider according to an embodiment of the present invention;

[0017] Figure 4 This is a front view of the fixing plate according to an embodiment of the present invention;

[0018] Figure 5 This is a left view of the fixing plate according to an embodiment of the present invention;

[0019] Figure 6 This is a front view of the fixed tooling assembly in use according to an embodiment of the present invention;

[0020] Figure 7 This is a top view of the fixed tooling assembly in use according to an embodiment of the present invention;

[0021] In the diagram, 1 is the first thin square tube, 2 is the thick square tube, 3 is the second thin square tube, 4 is the slider, 5 is the first positioning hole, 6 is the adjustable I-beam structure, 7 is the through hole of the thin square tube, 8 is the through hole of the thick square tube, 9 is the fixing plate, 10 is the upper protruding support plate, 11 is the lower protruding support plate, 12 is the second positioning hole, 13 is the fixed mounting hole, 14 is the upper iron yoke silicon steel sheet, 15 is the detachable thin square tube, and 16 is the pull plate. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] like Figure 1 The diagram shown is a flowchart of a fixing method according to an embodiment of the present invention. A method for fixing silicon steel sheets to an AC transformer yoke includes the following steps:

[0024] Step 1: Design a special fixture assembly for fixing silicon steel sheets with inserted iron yokes. The fixture assembly includes: an adjustable I-beam structure 6, a detachable thin square tube 15, and a fixing plate 9.

[0025] like Figure 2 The figure shown is a front view of the adjustable H-shaped structure according to an embodiment of the present invention. The adjustable H-shaped structure 6 includes: a first thin square tube 1, a second thin square tube 3, a thick square tube 2, and a slider 4. The first thin square tube 1 and the second thin square tube 3 are welded into a T-shaped structure. One end of the second thin square tube 3 is welded to the middle position of the first thin square tube 1. The end of the second thin square tube 3 away from the first thin square tube 1 is movably connected to the thick square tube 2 through the slider 4. The thick square tube 2 is provided with a plurality of first positioning holes 5, which are used to fix and position the detachable thin square tube 15 inserted into the thick square tube 2.

[0026] like Figure 3The figure shown is a cross-sectional view of the slider according to an embodiment of the present invention. The slider 4 is a cubic structure. Thin square tube through holes 7 and thick square tube through holes 8 are staggered vertically in the slider 4, and the thin square tube through holes 7 and thick square tube through holes 8 intersect each other. The end of the second thin square tube 3 away from the first thin square tube 1 passes through the thin square tube through hole 7, and the thick square tube 2 passes through the thick square tube through hole 8. Using the slider 4, the adjustable I-beam structure 6 can be freely disassembled and assembled according to the center distance of the three-phase core columns, which meets the usage requirements of inserting iron yoke silicon steel sheets for various core models. A third positioning hole is provided on the upper part of the slider 4. The third positioning hole is connected to the thin square tube through hole 7. After the second thin square tube 3 passes through the thin square tube through hole 7, the second thin square tube 3 is fixed by bolts and the third positioning hole, so that the first thin square tube 1 is pressed against the iron yoke silicon steel sheet. As the insertion of the iron proceeds, the position of the second thin square tube 3 inserted into the through hole 7 of the thin square tube is continuously adjusted so that the first thin square tube 1 is always pressed tightly against the already inserted upper iron yoke silicon steel sheet. To reduce the weight of the slider 4, aluminum alloy is preferred.

[0027] like Figure 4 The image shown is a front view of the fixing plate according to an embodiment of the present invention; as shown Figure 5 The image shown is a left view of the fixing plate according to an embodiment of the present invention. The fixing plate 9 is a plate-shaped structure with several fixing holes 13 vertically arranged from top to bottom. The fixing plate 9 is installed onto the pull plate 16 by bolts and fixing holes 13. An upper protruding support plate 10 and a lower protruding support plate 11 are arranged parallel to each other on the upper part of the fixing plate 9. The distance between the upper protruding support plate 10 and the lower protruding support plate 11 matches the detachable thin square tube 15 and is slightly larger than the cross-sectional side length of the detachable thin square tube 15. One end of the detachable thin square tube 15 is inserted between the upper protruding support plate 10 and the lower protruding support plate 11, and the other end of the detachable thin square tube 15 is inserted into the thick square tube 2. Second positioning holes 12 are respectively provided on the upper protruding support plate 10 and the lower protruding support plate 11. One end of the detachable thin square tube 15 is further fixed by bolts and second positioning holes 12. The mounting position of the fixing plate 9 can be connected to the pull plate 16 of the three-phase core column according to the width of the upper yoke silicon steel sheet. The entire fixture assembly is fixed to the upper yoke of the transformer, which determines the height of the entire fixing fixture assembly. The fixing plate 9 is indirectly connected to the adjustable I-beam structure 6. The fixing plate 9 is movably connected to the detachable thin square tube 15. One end of the detachable thin square tube 15 is inserted between the upper protruding support plate 10 and the lower protruding support plate 11 and tightened with bolts. Then, the other end of the detachable thin square tube 15 is inserted into the thick square tube 2, its length is adjusted to the appropriate position and tightened with bolts.

[0028] Step 2: Fix the fixing plate 9 onto the pull plate 16 of the three-phase core column. A total of 3 sets of fixing plates 9 are used, and they are fixed onto the pull plates 16 of the A-phase, B-phase and C-phase core columns respectively.

[0029] Step 3: Use two sets of adjustable I-beam structures 6. The two thick square tubes 2 of the two sets of adjustable I-beam structures 6 are connected by a detachable thin square tube 15. The middle part of the detachable thin square tube 15 is tightened with bolts through the upper protruding support plate 10 and the lower protruding support plate 11 of the pull plate 16 of the B-phase core column. Insert a detachable thin square tube 15 into the outer end of each of the two thick square tubes 2 of the two sets of adjustable I-beam structures 6, adjust the length of the detachable thin square tube 15 to the appropriate position, and tighten it with bolts.

[0030] Step 4: Insert the upper iron yoke silicon steel sheets of phases A, B and C simultaneously. Insert the upper iron yoke silicon steel sheets vertically from top to bottom. Adjust the position of the second thin square tube 3 in the slider 4 so that the first thin square tube 1 of the two sets of adjustable I-beam structures 6 presses against the inserted upper iron yoke silicon steel sheets to prevent them from tipping over.

[0031] Step 5: While inserting the iron, simultaneously adjust the position of the second thin square tube 3 in the slider 4 so that the first thin square tube 1 is always pressed against the already inserted upper iron yoke silicon steel sheet until the iron insertion work is completed.

[0032] like Figure 6 The image shown is a front view of the fixed tooling assembly in use according to an embodiment of the present invention; as shown... Figure 7 The figure shown is a top view of the fixed fixture assembly in use according to an embodiment of the present invention. The pull plate 16 is fixedly installed on the core column clamp of the transformer (the core column clamp is not shown in the figure). The insertion of the iron is completed after the two sets of fixed fixture assemblies are combined. The two thick square tubes 2 are connected by a detachable thin square tube 15. The fixed fixture assembly is in direct contact with the inserted silicon steel sheet. The upper yoke silicon steel sheet of phase A is pressed by one set of fixed fixture assemblies, the upper yoke silicon steel sheet of phase C is pressed by another set of fixed fixture assemblies, and the upper yoke silicon steel sheet of phase B is pressed by both sets of fixed fixture assemblies at the same time. The fixed fixture assembly plays a supporting and fixing role during the insertion process. After the fixture is fixed and installed, the horizontality and flatness are relatively high. After the iron is inserted, the silicon steel sheet is close to the fixture, which can effectively reduce the waviness and ensure the horizontality of the inserted silicon steel sheet. As the waviness is reduced, the flatness of the silicon steel sheet is controlled, and the joints with the core columns of phases A, B, and C are controlled accordingly, optimizing the assembly requirements.

[0033] For example, in a certain AC transformer (SZ11-50000 / 110), the length of the silicon steel sheet on the upper yoke is 1500-2030mm, and the width is 295-660mm. Based on the core dimensions, the thick square tube 2 in the adjustable I-beam structure 6 is determined to be a stainless steel thick square tube with a cross-sectional side length of 36mm and a length of 1000mm; the thin square tube is a thin square tube with a cross-sectional side length of 30mm and a length of 1000mm. Based on the size and spacing of the openings on the pull plate 16, the openings on the fixing plate 9 are determined to be... and Two types are available, with hole spacing of 180mm and 260mm respectively. Appropriate openings are selected based on the width of the silicon steel sheet as connection holes, and the fixing plate 9 is bolted to the tie plate 16 for fixation. This design can also be applied to various specifications of AC transformers. Different sized openings and different hole spacings are used to adjust the height of the fixing plate 9; typically, six openings are used. Among them, the larger opening... The small holes are made according to the threaded holes of the pull plate 16 on the 220kV transformer product, and the small holes are made according to the threaded holes of the pull plate 16 on the 110kV transformer core. Two hole spacings are made for the 110kV transformer core, and the height of the fixing plate 9 can be adjusted by opening the holes. Two detachable thin square tubes 15 are inserted into the outer ends of the thick square tubes 2 of the two adjustable I-beam structures 6 by about 300mm. The two thick square tubes 2 are connected by a detachable thin square tube 15. The thick square tubes 2 of the adjustable I-beam structure 6 are adjusted to be about 350mm away from the first thin square tube 1, so that the adjustable I-beam structure 6 supports and fixes the inserted silicon steel sheet tightly. The slider 4 and the square tube always maintain a 1mm gap to achieve sliding. The two are in movable contact. After adjustment, the bolts are tightened. When the iron is inserted, after the silicon steel sheet of the upper yoke is inserted into the first stage of the high voltage side of the transformer core, the adjustable I-beam structure 6 is fixed on the other side (i.e., the low voltage side). One end of the first thin square tube 6 of the adjustable I-beam structure 6 rests against the center of the upper yoke silicon steel sheet 100mm above it, which serves to support the upper yoke silicon steel sheet.

[0034] The wider the silicon steel sheet, the higher the fixed position of the adjustable I-beam structure 6. It is advisable to fix the adjustable I-beam structure 6 at the upper 2 / 3 of the width of the silicon steel sheet to better prevent the silicon steel sheet from tipping over.

[0035] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A method for fixing silicon steel sheets to the yoke of an AC transformer, characterized in that, Includes the following steps: Step 1: Design a dedicated tooling assembly for fixing silicon steel sheets with an inserted iron yoke, including: an adjustable I-beam structure (6), a detachable thin square tube (15), and a fixing plate (9). The adjustable I-beam structure (6) includes: a first thin square tube (1), a second thin square tube (3), a thick square tube (2), and a slider (4). The first thin square tube (1) and the second thin square tube (3) are integrally formed into a T-shaped structure. The end of the second thin square tube (3) away from the first thin square tube (1) is movably connected to the thick square tube (2) through the slider (4). The thick square tube (2) is provided with several first positioning holes (5). The slider (4) is a cubic structure. The slider (4) is provided with thin square tube through holes (7) and thick square tube through holes (8) staggered vertically. The through hole (7) and the through hole (8) of the thick square tube intersect each other. A third positioning hole is set on the upper part of the slider (4). The third positioning hole is connected to the through hole (7) of the thin square tube. The fixing plate (9) is a plate structure. Several fixing installation holes (13) are set vertically from top to bottom on the fixing plate (9). An upper protruding support plate (10) and a lower protruding support plate (11) are set parallel to each other on the upper part of the fixing plate (9). The distance between the upper protruding support plate (10) and the lower protruding support plate (11) is greater than the side length of the cross section of the detachable thin square tube (15). One end of the detachable thin square tube (15) is inserted between the upper protruding support plate (10) and the lower protruding support plate (11). The other end of the detachable thin square tube (15) is inserted into the thick square tube (2). Step 2: Fix the fixing plate (9) onto the pull plate (16) of the three-phase core column. A total of 3 sets of fixing plates (9) are used, and they are fixed onto the pull plates (16) of the A-phase, B-phase and C-phase core columns respectively. Step 3: Use two sets of adjustable I-beam structures (6). The two thick square tubes (2) of the two sets of adjustable I-beam structures (6) are connected by a detachable thin square tube (15). Insert a detachable thin square tube (15) into the outer end of each of the two thick square tubes (2) of the two sets of adjustable I-beam structures (6). Adjust the length of the detachable thin square tube (15) to the appropriate position and tighten it with a bolt. Step 4: Insert the upper iron yoke silicon steel sheets of phases A, B and C simultaneously. Insert the upper iron yoke silicon steel sheets vertically from top to bottom. Adjust the position of the second thin square tube (3) in the slider (4) so ​​that the first thin square tube (1) of the two sets of adjustable I-beam structures (6) presses against the inserted upper iron yoke silicon steel sheets to prevent them from tipping over. Step 5: While inserting the iron, simultaneously adjust the position of the second thin square tube (3) in the slider (4) so ​​that the first thin square tube (1) is always pressed against the already inserted upper iron yoke silicon steel sheet until the iron insertion work is completed.

2. The method for fixing silicon steel sheets to an AC transformer by inserting a yoke according to claim 1, characterized in that, The middle part of the detachable thin square tube (15) between the two thick square tubes (2) is bolted together by the upper protruding support plate (10) and the lower protruding support plate (11) of the pull plate (16) of the B phase core column.

3. The method for fixing silicon steel sheets to an AC transformer by inserting a yoke according to claim 2, characterized in that, The first thin square tube (1) and the second thin square tube (3) are welded into a T-shaped structure.

4. The method for fixing silicon steel sheets to an AC transformer by inserting a yoke according to claim 3, characterized in that, One end of the second thin square tube (3) is welded to the middle position of the first thin square tube (1).

5. The method for fixing silicon steel sheets to an AC transformer by inserting a yoke according to claim 4, characterized in that, The upper protruding support plate (10) and the lower protruding support plate (11) are respectively provided with second positioning holes (12).

6. The method for fixing silicon steel sheets to an AC transformer by inserting a yoke according to claim 1, characterized in that, Slider (4) is made of aluminum alloy.

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