A method for improving the efficiency of a distribution transformer core insert

Abstract

The application is a method for improving the efficiency of the inserted sheet of the distribution transformer core. The core adopts three-column step type, and the silicon steel sheet is easier to be inserted, so the efficiency can be improved. The method further includes the pre-treatment before the upper yoke is pulled out, and the glue is brushed at the two windows of the core, so the integrity of the silicon steel sheet can be improved, and the sheet arranging time in the inserting process can be reduced. The method further includes that the upper yoke is placed on the upper yoke placing rack located in front of the core after the upper yoke is pulled out according to the inserting sequence, the silicon steel sheet with a longer length is placed below the core upper yoke placed on the upper yoke placing rack, and the inserting efficiency is improved. The height of the upper yoke placing rack and the core placing rack is adjustable, the universality is improved, the personnel bending work is avoided, and the labor intensity is reduced. The silicon steel sheet is inserted according to the edge column-middle column-edge column sequence. The silicon steel sheet is easier to be inserted, and the efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of improving the efficiency of distribution transformer core insert piece insert piece method, belong to distribution transformer body assembly technical field. BACKGROUND

[0002] In the production process of distribution transformer core, generally whole stack is used, and the upper yoke of the core is removed during the assembly of the transformer, the coil is assembled, and then the upper yoke is inserted back.

[0003] In the prior art, the core structure in the distribution transformer industry generally adopts two-column step mode, and it is difficult to insert silicon steel sheets during insertion, which affects the insertion efficiency; the surface of the upper yoke is not treated during insertion, which causes poor integrity of the silicon steel sheets, and the sheet arranging time during insertion is long, which is not conducive to the insertion alignment; the removed core upper yoke is generally placed on the desktop behind the worker, and the worker needs to turn around to take the sheet, which is inconvenient to operate, has high labor intensity, and affects the insertion efficiency; and the insertion operation method of the worker and the insertion sequence of the core column are different in each company, the operation lacks consistency, the insertion quality and efficiency completely depend on the proficiency and personal experience of the staff, which causes uneven production quality and low production efficiency. SUMMARY

[0004] The present application proposes an insertion method for improving the efficiency of distribution transformer core insertion, which aims to overcome the above-mentioned deficiencies in the prior art, improve the efficiency and quality stability of distribution transformer core insertion, and is easy to operate.

[0005] The technical solution of the present application is an insertion method for improving the efficiency of distribution transformer core insertion, and the core adopts three-column step mode. The three-column step core is a high-voltage side step mode, that is, the middle column and the two side columns of the high-voltage side of the core can see steps, the middle column and the two side columns of the low-voltage side of the core cannot see steps, and the insertion is started from the low-voltage side to the high-voltage side, and the steps of the core column are always visible during the insertion process. The steps are all visible, which makes it easier to insert silicon steel sheets during insertion, and can improve the efficiency.

[0006] Preferably, it also includes pre-treatment before the upper yoke is pulled out, specifically, a layer of glue is applied to the surface of the core upper yoke corresponding to the two windows of the core, and the core upper yoke is pulled out after the glue on the surface of the core upper yoke is completely dry. The glue is 550 glue with a width of 3 cm. It can increase the integrity of the silicon steel sheets and reduce the sheet arranging time during insertion.

[0007] Preferably, it also includes placing the upper yoke after pulling it out, specifically, the pulled-out core upper yoke is placed on the upper yoke placing rack located in front of the core in the order of re-insertion, and the core upper yoke placed on the upper yoke placing rack is synchronized with the silicon steel sheets with longer length below. The silicon steel sheets can be taken without turning around, which improves the insertion efficiency.

[0008] Preferably, the height of the upper yoke placement frame is adjustable, and the height of the core placement frame at the bottom of the core is also adjustable. This accommodates cores of different heights and operators, improving versatility, avoiding bending over during operation, and reducing labor intensity.

[0009] Preferably, the laminations are inserted in the order of one side post – the middle post – the other side post. Specifically, during the core yoke insertion, when retrieving the silicon steel laminations from the core placement rack, first pick up the head of the longest silicon steel lamination in a single step, then clamp all the silicon steel laminations above it. One or more steps are taken at a time, first inserting one side post along the seam, then inserting the middle post and the other side post in sequence. This makes the silicon steel laminations easier to insert and increases efficiency.

[0010] Advantages of this invention:

[0011] 1) Compared with the existing two-column stepped iron core structure, the three-column stepped iron core structure makes all the steps visible, making it easier to insert silicon steel sheets during lamination and resulting in higher efficiency;

[0012] 2) Compared with the existing technology where the yoke of the iron core is not treated, a layer of glue is applied to each of the iron core windows before the yoke is pulled out. This can increase the integrity of the silicon steel sheets, reduce the time for sheet sorting during the insertion process, and make the sheet alignment more convenient and faster.

[0013] 3) Compared with the existing technology, the removed iron core yoke is placed behind the personnel. The removed upper yoke silicon steel sheets are placed on the upper yoke placement rack in front of the iron core in the order of re-insertion. The longer silicon steel sheets are placed at the bottom. The silicon steel sheets can be picked up without turning around, which is more convenient and faster. It can reduce labor intensity, reduce ineffective work time, and improve the efficiency of inserting the sheets.

[0014] 4) The height-adjustable placement rack can accommodate iron cores and operators of different heights, has good versatility, avoids bending over for operation, and reduces the labor intensity of personnel;

[0015] 5) Compared with the existing technology where the insertion sequence is unclear, the insertion sequence of side post-middle post-side post is adopted, which makes it easier to insert silicon steel sheets and is more efficient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the working state of an embodiment of the method for improving the efficiency of transformer core lamination according to the present invention.

[0017] Figure 2 This is a schematic diagram of an embodiment of a three-column stepped iron core.

[0018] Figure 3 This is a schematic diagram of an embodiment of the method for improving the efficiency of transformer core laminations in this invention, which involves applying adhesive to the yoke of the core.

[0019] Figure 4is Figure 2 The three-dimensional structure diagram after removing the coil.

[0020] 1 is a plug worker, 2 is a core, 21 is glue, 22 is a middle column, 23 is a side column, 3 is a core placement rack, 4 is an upper yoke placement rack, and 5 is an upper yoke of the core. DETAILED DESCRIPTION

[0021] The application will be further described in detail below in combination with examples and specific embodiments. Example 1

[0022] A plug-in method for improving the efficiency of plug-in of a distribution transformer core, comprising: distribution transformer core structure design, pre-treatment before pulling out the upper yoke, placement after pulling out the upper yoke, and plug-in sequence.

[0023] Specifically comprising the following steps:

[0024] Step 1: Distribution transformer core structure design: adopt the three-column step mode as shown in Figure 2 , 4 , and the high-voltage side has steps.

[0025] Specifically, the middle column 22 and the two side columns 23 of the high-voltage side of the core 2 can have steps, and the middle column 22 and the two side columns 23 of the low-voltage side of the core 2 cannot have steps.

[0026] Step 2: Pre-treatment before pulling out the upper yoke: before pulling out the core upper yoke 5, brush a line of glue 21 at each window of the core upper yoke 5;

[0027] Step 3: Placement after pulling out the upper yoke: design a height-adjustable upper yoke placement rack 4, place it in front of the core 2, and place the pulled-out core upper yoke 5 on the upper yoke placement rack 4 according to the re-insertion sequence, and simultaneously put the longer silicon steel sheets in the lower part.

[0028] Step 4: Plug-in sequence: adopt the sequence of one side column 23-middle column 22-another side column 23 for plug-in, and specifically adopt the sequence of right side column-middle column-left side column for plug-in in this embodiment.

[0029] As shown in Figures 1-4 , when designing the structure of the distribution transformer core 2, the three-column step mode is adopted, the low-voltage side has no steps, the high-voltage side has steps, the plug-in worker 1 stands on the high-voltage side, and the plug-in starts from the low-voltage side and proceeds to the high-voltage side, and the core column steps remain fully visible throughout the plug-in process.

[0030] As shown in Figure 3As shown, the method is used when the transformer is assembled, before the upper yoke 5 is pulled out, a 3 cm wide 550 glue 21 is applied on the surface of the upper yoke 5 corresponding to the two windows of the core 2, and after the surface of the upper yoke 5 is completely dry, the upper yoke 5 is pulled out manually.

[0031] As shown, Figure 1 As shown, when the insert piece is inserted, the height-adjustable upper yoke placing rack 4 and the core placing rack 3 (wherein the core placing rack 3 can be used to place the core and can also be used as a standing platform for the insert piece worker 1) are used, which can adapt to cores of various specifications, so that the core 2 and the upper yoke 5 are always at a relatively comfortable height compared to insert piece workers 1 of different heights when inserting the insert piece; at the same time, the silicon steel sheets pulled out from the upper yoke 5 are placed in front of the core 2 according to the order of re-insertion, and the silicon steel sheets with longer lengths are placed below.

[0032] During the re-insertion operation of the upper yoke 5 by the insert piece worker 1, when the silicon steel sheet is taken from the core placing rack 3, the head of the single-step silicon steel sheet with the longest length is first picked up with the hand, and then all the silicon steel sheets above are clamped, one step or multiple steps can be taken each time, and the re-insertion sequence of the silicon steel sheet is in the order of side column-middle column-side column, that is, one side column 23 is inserted first, and then the middle column 22 and the other side column 23 are inserted in turn.

[0033] The difference between Comparative Example 1 and Example 1 is that no glue is applied before the upper yoke is pulled out, and three groups of 50kVA capacity core insert piece experiments are respectively carried out, and the experimental data are as follows:

[0034]

[0035] According to the above table, brushing glue before pulling out the upper yoke can effectively reduce the average step insertion time.

[0036] Comparative Examples 2-5 and Example 1 differ in that no glue is applied before the upper yoke is pulled out, and Comparative Examples 2, 4 and 5 and Example 1 also differ in that three-column stepless, two-column stepped and single-column stepped structures are respectively used, and three groups of 50kVA capacity core insert piece experiments are respectively carried out, and the experimental data are as follows:

[0037]

[0038] According to the above table, the three-column stepped structure of the variable transformer core can effectively reduce the average step insertion time.

[0039] Comparative Examples 6-8 and Example 1 differ in that no glue is applied before the upper yoke is pulled out, and Comparative Examples 7 and 8 and Example 1 also differ in that the upper yoke is placed behind and on the side of the core after being pulled out, and three groups of 50kVA capacity core insert piece experiments are respectively carried out, and the experimental data are as follows:

[0040]

[0041] According to the above table, placing the upper yoke in front of the core after pulling out can effectively reduce the average step-in time of the insert piece.

[0042] Comparative examples 9-12 differ from example 1 in that no glue is applied before pulling out the upper yoke of the core, and comparative examples 9-11 also differ from example 1 in that the insert piece sequence is respectively defined as left column-middle column-right column, middle column-left column-right column, and middle column-right column-left column, and three groups of 50kVA capacity core insert piece experiments are respectively carried out, and the experimental data are as follows:

[0043]

[0044] According to the above table, the sequence of the insert piece sequence is defined as the sequence of the side column-middle column-side column, and the insert piece is inserted, which can effectively reduce the average step-in time of the insert piece.

[0045] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A method of improving the efficiency of a laminated core insert, characterized by, The iron core (2) adopts three-column step type; the insertion piece is performed in the order of one side column (23)-middle column (22)-another side column (23); it also includes pre-treatment before the upper yoke is pulled out, specifically, a layer of glue (21) is applied on the surface of the corresponding upper yoke (5) of the iron core (2) at two windows, and the upper yoke (5) is pulled out after the glue (21) on the surface of the upper yoke (5) is completely dry; it also includes placing the upper yoke after being pulled out, specifically, the pulled-out upper yoke (5) is placed on the upper yoke placing rack (4) located in front of the iron core (2) according to the insertion sequence; the upper yoke placing rack (4) is height-adjustable; the iron core placing rack (3) where the bottom of the iron core (2) is located is height-adjustable; the three-column step type iron core (2) is high-voltage side step type, that is, the middle column (22) and the two side columns (23) of the high-voltage side of the iron core (2) can all be seen as steps, the middle column (22) and the two side columns (23) of the low-voltage side of the iron core (2) cannot all be seen as steps, the insertion piece is performed from the low-voltage side to the high-voltage side, and the iron core column steps are always fully visible during the insertion piece process; specifically, the upper yoke (5) is inserted back, when the silicon steel sheets are taken from the iron core placing rack (3), the sheet head of the single-step silicon steel sheet with the longest length is first picked up, then all the upper silicon steel sheets are clamped, one step or multiple steps are taken each time, one side column (23) is first inserted, then the middle column (22) and the other side column (23) are sequentially inserted.

2. The method of claim 1, wherein the step of inserting the core sheet is performed by a method comprising: The glue (21) is 550 glue with a width of 3 cm. ​ 3. The method of claim 1, wherein the step of inserting the core insert is performed by a method comprising: The iron core upper yoke (5) placed on the upper yoke placing rack (4) is synchronized with the silicon steel sheets with longer length below. ​

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