A power transformer core silicon steel sheet stacking system and a stacking method

Abstract

The application discloses a kind of power transformer core silicon steel sheet stacking system and stacking method, and the stacking table in stacking system is provided with magnetic attraction piece below, and the silicon steel sheet on the stacking table is positioned by magnetic attraction of magnetic attraction piece;Including the pressing device of the elastic pressing of the silicon steel sheet on the stacking table includes the flatness detection device for the rolling flatness detection of the surface of the silicon steel sheet in stacking state.The silicon steel sheet is positioned and pressed by magnetic attraction in the stacking process in the application, to avoid silicon steel sheet side slip and improve the compactness of silicon steel sheet stacking, and the stacking quality is grasped in time by flatness detection, to improve the stacking precision of silicon steel sheet.

Description

Technical Field

[0001] This invention belongs to the field of silicon steel sheet stacking technology, and particularly relates to a silicon steel sheet stacking system and stacking method for power transformer cores. Background Technology

[0002] During the stacking of silicon steel sheets, the silicon steel sheets are prone to lateral slippage due to the stacking bonding force, which affects the stacking quality of the silicon steel sheets. This is especially serious when there is a lack of downward positioning force. Moreover, the force to ensure the tightness of the stacking is not perfect enough, and the silicon steel sheets are prone to curling at both ends or bulging in the middle, which affects the stacking accuracy of the silicon steel sheets. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a stacking system and method for silicon steel sheets of power transformer core. By magnetically positioning and pressing down on the silicon steel sheets during the stacking process, the silicon steel sheets are prevented from slipping and the compactness of the stacking is improved. The stacking quality is monitored in a timely manner by flatness detection, thereby improving the stacking accuracy of silicon steel sheets.

[0004] Technical solution: To achieve the above objectives, the present invention provides a method for stacking silicon steel sheets for the core of a power transformer, comprising a stacking system and a stacking method for stacking silicon steel sheets for the core of a power transformer using the stacking system.

[0005] The stacking system has magnetic suction components installed under the stacking table, which magnetically position the silicon steel sheets on the stacking table.

[0006] Includes a clamping device to elastically clamp the silicon steel sheets on the stacking table;

[0007] Includes a flatness testing device for rolling flatness testing of the surface of stacked silicon steel sheets;

[0008] During the stacking of silicon steel sheets, as the stacking thickness increases, the magnetic suction components gradually adjust their distance from the stacking table to ensure that all stacked silicon steel sheets are within the magnetic suction range, forming magnetic positioning in the vertical direction. As the silicon steel sheets are stacked layer by layer or partially layer by layer, the elastic clamping of the clamping device forms an elastic clamping force from top to bottom, strengthening the stacking compactness of the silicon steel sheets. During the stacking process, the flatness is checked layer by layer or multiple layers by a flatness detection device.

[0009] Furthermore, a thickness detection sensor is installed above the stacking table in the stacking system. The thickness detection sensor detects the stacking thickness during the stacking of silicon steel sheets. Based on the thickness detection result, the magnetic suction component is gradually raised and adjusted as the stacking thickness increases through the matching lifting and adjusting drive unit.

[0010] Furthermore, the magnetic suction component, the lifting and adjusting drive unit, and the thickness detection sensor device correspond one-to-one; there are multiple magnetic suction components, each corresponding to a position of the central column, upper yoke, lower yoke, and side yoke of the iron core.

[0011] Furthermore, the clamping device includes a telescopic elastic clamping member, which can be raised and lowered relative to the stacking table; when it is necessary to clamp the silicon steel sheet, the telescopic elastic clamping member descends to clamp the silicon steel sheet on the stacking table; when it is necessary to stack the next silicon steel sheet, the telescopic elastic clamping member rises to release the elastic clamping on the silicon steel sheet on the stacking table.

[0012] Furthermore, the elastic component of the telescopic elastic clamping member is a pressure sensor spring. During the descent of the telescopic elastic clamping member, the pressure sensor spring is gradually compressed from the moment it contacts the silicon steel sheet. When the pressure sensor spring detects that the pressure value exceeds the critical value, it maintains the elastic clamping force at this time to elastically clamp the silicon steel sheet on the stacking table.

[0013] Furthermore, the clamping force on the silicon steel sheets on the stacking table is adjustable, and the clamping force increases as the pressure sensor spring is compressed.

[0014] Furthermore, each part of the iron core, including the central column, upper yoke, lower yoke, and side yoke, corresponds to at least two elastic clamping components. All elastic clamping components corresponding to the same part of the iron core are installed at the same height on the same mounting plate, and the elastic clamping components on the same mounting plate are in the same vertical plane, forming a dual-point clamping structure or a multi-point clamping structure.

[0015] Furthermore, the flatness detection device includes a walking flatness detection array, which has several pressure rolling detectors arranged in an array. The flatness detection array moves along the contour trajectory of the iron core, causing each pressure rolling detector to roll on the surface of the silicon steel sheet. By the difference in the pressure values ​​detected by the pressure rolling detectors, it is determined whether the stacked silicon steel sheets are flat.

[0016] Furthermore, the pressure-type rolling detector includes a pressure detection unit, an elastic support, and a rolling part arranged sequentially from top to bottom. The rolling part maintains the state of the pressure detection part at the top of the spring through the elastic support.

[0017] Furthermore, the walking flatness detection array also includes a honeycomb mounting with honeycomb holes; each of the pressure rolling detectors is arranged in a linear array on the honeycomb mounting corresponding to the honeycomb holes, with the honeycomb holes being adapted to the width of the silicon steel sheet.

[0018] Beneficial effects: The beneficial effects of the silicon steel sheet stacking system and method for power transformer cores of the present invention are as follows:

[0019] 1) By using magnetic positioning and pressing to tighten the silicon steel sheets during the stacking process, the silicon steel sheets are prevented from slipping and the tightness of the stacking is improved, thereby improving the stacking accuracy and quality of the silicon steel sheets.

[0020] 2) The magnetic components in the magnetic positioning system can be raised according to the increase in stacking thickness to adjust the magnetic distance and ensure the magnetic positioning of the upper silicon steel sheet.

[0021] 3) The pressing process is elastic pressing, which has a buffering and protective effect on the silicon steel sheet, avoiding deformation of the silicon steel sheet under pressure;

[0022] 4) Flatness inspection by rolling can promptly assess the stacking quality, allowing for timely rework to identify problems and reduce losses. Attached Figure Description

[0023] Appendix Figure 1 This is a schematic flowchart of the method for stacking silicon steel sheets in the core of a power transformer according to the present invention.

[0024] Appendix Figure 2 A schematic diagram of the stacking platform and magnetic components;

[0025] Appendix Figure 3 A schematic diagram showing the distribution of the magnetic components;

[0026] Appendix Figure 4 This is a schematic diagram of an embodiment of the clamping device;

[0027] Appendix Figure 5 This is a schematic diagram of an embodiment of the flatness detection device;

[0028] Appendix Figure 6 This is a schematic diagram of the flatness detection array. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] As attached Figure 1As shown, a method for stacking silicon steel sheets for power transformer cores includes a stacking system. The stacking system is used to stack silicon steel sheets for power transformer cores. A magnetic suction element 21 is installed below the stacking platform 1 in the stacking system. The magnetic suction element 21 positions the silicon steel sheets on the stacking platform 1 magnetically. During the stacking process, the silicon steel sheets on the upper layer are easily affected by the adhesion force of the next stacked silicon steel sheet, causing them to slip sideways and affecting the stacking operation. The magnetic suction element 21, by magnetically positioning the silicon steel sheets, can eliminate this effect and prevent the silicon steel sheets from slipping. The sheets slip sideways due to the stacking and bonding force. Moreover, during the stacking process of silicon steel sheets, the magnetic suction component 21 gradually adjusts its distance from the stacking table 1 as the stacking thickness increases, keeping all stacked silicon steel sheets within the magnetic suction range and forming magnetic positioning in the vertical direction. As the stacking thickness increases, it is necessary to ensure the magnetic suction effect of the magnetic suction component 21 on the top silicon steel sheet. Therefore, during the stacking operation, the magnetic suction component 21 gradually rises as the stacking thickness of the silicon steel sheets increases, realizing the adjustment of the magnetic suction distance, thereby ensuring the retention and stability of the magnetic suction of the silicon steel sheets.

[0031] As attached Figure 2 As shown, a support plate 26 is mounted on the bottom of the stacking table 1 via a support column 25. A magnetic suction element 21, which is a magnet, slides vertically through the support plate 26. The lifting and adjusting drive unit 22 can be an electric push rod. (See attached diagram) Figure 3 As shown, the magnetic suction component 21, the lifting and adjusting drive unit 22, and the thickness detection sensor device 23 correspond one-to-one; there are multiple magnetic suction components 21, which correspond to the central column, upper yoke, lower yoke, and side yoke of the iron core, thereby ensuring that the silicon steel sheets stacked at each position have a magnetic suction positioning effect.

[0032] A thickness detection sensor 23 is installed above the stacking table in the stacking system. During the stacking of silicon steel sheets, the thickness detection sensor 23 detects the stacking thickness. Based on the thickness detection result, the magnetic suction component 23 is gradually raised and adjusted according to the increasing stacking thickness via a matching lifting and adjusting drive unit 22. This achieves the purpose of automatically adjusting the magnetic suction distance according to the stacking thickness, resulting in high automation accuracy and efficiency. The thickness detection sensor 23 is a distance sensor located above the stacking table 1 and mounted on a matching first movable bracket 24. The principle of automated magnetic suction adjustment is as follows: during the silicon steel sheet stacking operation, as the stacking thickness increases, the distance detected by the distance sensor gradually decreases, and a corresponding signal is sent to the control system. The control system then controls an electric push rod to gradually move the magnetic suction component 21 upwards, achieving magnetic suction distance adjustment and ensuring continuous magnetic positioning of the silicon steel sheet by the magnetic suction component.

[0033] The device includes a pressing device 3, which elastically presses the silicon steel sheets on the stacking table. More specifically, as the silicon steel sheets are stacked layer by layer or locally layer by layer, the pressing device 3 forms an elastic pressing force from top to bottom, which strengthens the stacking compactness of the silicon steel sheets. This makes the stacking of each silicon steel sheet more tightly fitted, improving the stacking accuracy and quality. The pressing force pressing down on the silicon steel sheets is an elastic pressing force, which plays a buffering and protective role against downward pressure, avoiding downward impact damage to the silicon steel sheets.

[0034] The clamping device 3 includes a telescopic elastic clamping member 32, which can be raised and lowered relative to the stacking table 1. When it is necessary to clamp the silicon steel sheet, the telescopic elastic clamping member 32 descends to clamp the silicon steel sheet on the stacking table. When it is necessary to stack the next silicon steel sheet, the telescopic elastic clamping member 32 rises to release the elastic clamping on the silicon steel sheet on the stacking table. The elastic component of the telescopic elastic clamping member 32 is a pressure sensor spring. During the descent of the telescopic elastic clamping member 32, the pressure sensor spring is gradually compressed from the point of contact with the silicon steel sheet. When the pressure sensor spring detects that the pressure value exceeds a critical value, it maintains the elastic clamping force at this point to elastically clamp the silicon steel sheet on the stacking table. Moreover, the clamping force on the silicon steel sheet on the stacking table is adjustable, and the clamping force increases as the pressure sensor spring is compressed.

[0035] As attached Figure 4 As shown, the elastic clamping component 32 includes a cylinder 3.1, a clamping column 3.2, and a first spring 3.3; the top of the cylinder 3.1 is a plug 3.4, and the elastic clamping component 32 is mounted on the mounting plate 33 through the plug 3.4. A downward driving part 31 is connected to the mounting plate 33, and the downward driving part 31 is mounted on the second movable bracket 34. The downward driving part 31 can be an electric push rod; the clamping column 3.2 and the cylinder 3.1 are elastically slidingly engaged through the first spring 3.3. In the dual-point clamping structure and the multi-point clamping structure, one of the elastic components... The first spring 3.3 of the clamping component 32 is a pressure sensor spring. The automatic control of the downward clamping is realized through the linkage between the pressure sensor spring and the downward driving part 31. In order to prevent the clamping column 3.2 from detaching from the cylinder 3.1, it is necessary to limit it axially. The cylinder opening end of the cylinder 3.1 has a limiting block 3.52, and the side of the clamping column 3.2 has an axially extending limiting groove 3.52. The limiting groove 3.52 is a groove structure with closed ends, that is, it is not a through groove structure. The limiting block 3.51 extends into the limiting groove 3.51.

[0036] Each of the central column, upper yoke, lower yoke, and side yoke of the iron core corresponds to at least two elastic clamping members 32. All elastic clamping members 32 corresponding to the same part of the iron core are installed at the same height on the same mounting plate 33, and the elastic clamping members 32 on the same mounting plate 33 are in the same vertical plane, forming a dual-point clamping structure or a multi-point clamping structure. The clamping of the silicon steel sheet needs to prevent the silicon steel sheet from warping at both ends due to downward pressure from a single point, which would result in insufficient clamping. Therefore, we adopt a dual-point clamping structure or a multi-point clamping structure with at least two clamping points on the silicon steel sheet to avoid the situation where the silicon steel sheet warps and the clamping is inadequate.

[0037] The system includes a flatness detection device 4, used to roll and flatten the surface of the stacked silicon steel sheets. More specifically, during the stacking process, the flatness detection device 4 performs flatness checks layer by layer or multiple layers. During the stacking of silicon steel sheets, it is necessary to detect the flatness of the stack to understand the stacking quality and accuracy in a timely manner. If unevenness is detected, rework can be carried out promptly, avoiding further time waste and economic losses, and improving stacking efficiency.

[0038] More specifically, as shown in the appendix Figure 5 and attached Figure 6 As shown, the flatness detection device 4 includes a mobile flatness detection array 42, which has several pressure-type rolling detectors 43 arranged in an array. The flatness detection array 42 moves along the contour trajectory of the iron core, causing each pressure-type rolling detector 43 to roll on the surface of the silicon steel sheet. By analyzing the differences in the pressure values ​​detected by the pressure-type rolling detectors 43, the flatness of the stacked silicon steel sheets is determined. This method provides comprehensive flatness detection and accurate results.

[0039] The walking flatness detection array 42 also includes a honeycomb mounting 44 with honeycomb holes 440, i.e., a honeycomb block, with mounting rods on the honeycomb block. The flatness detection device 4 also includes a three-axis servo slide module 41 that provides lifting and walking driving force for the walking flatness detection array 42. The three-axis servo slide module 41 is mounted on the third movable support 44. Each of the pressure rolling detectors 43 is arranged in a linear array on the honeycomb mounting 44 corresponding to the honeycomb holes 440, which is adapted to the width of the silicon steel sheet. During rolling, it can cover the silicon steel sheet in the width direction.

[0040] The pressure-type rolling detector 43 includes a pressure detection unit 4.3, an elastic support, and a rolling part 4.4 arranged sequentially from top to bottom. The rolling part 4.4 maintains the state of the pressure detection unit 4.3 at the top of the spring through the elastic support. The pressure detection unit 4.3 is a miniature pressure sensor, installed at the upper end of the honeycomb hole 440; the rolling part 4.4 is composed of a ball cup 4.4 at the bottom of the rod 4.1 with a built-in ball; the lower end of the honeycomb hole 440 has a plug 4.7; the rod 4.1 slides through the plug 4.7 and extends into the honeycomb hole 440; the elastic support includes a second spring 4.5 and an elastic abutment 4.6; the top of the rod 4.1 has a baffle 4.5; the second spring 4.5 elastically connects the baffle 4.5 and the plug 4.7, so that the rod 4.1 and the plug 4.7 elastically cooperate; the elastic abutment 4.6 is located between the pressure detection unit 4.3 and the baffle 4.5; the elastic abutment 4.6 is provided with elastic force by the second spring 4.5 to maintain the state of elastic abutment against the pressure detection unit 4.3. During the rolling flatness test, rolling will not damage the silicon steel sheet. During the rolling process, the pressure on the top is detected by a miniature pressure sensor. If unevenness occurs, the detection value of the miniature pressure sensor will be different from that of other miniature pressure sensors, resulting in a discrepancy.

[0041] The silicon steel sheet stacking method using this stacking system is divided into a stacking section followed by a flatness inspection section. The specific steps are as follows:

[0042] a) Stacked section

[0043] a1: Silicon steel sheets are stacked on the stacking table 1. The stacking order is first the central column, then the upper and lower yokes, and finally the side yokes, using one sheet at a time. The main sheet of the central column can be stacked one level at a time. When the silicon steel sheets are stacked, the magnetic suction component 21 directly below the corresponding position will exert a downward magnetic attraction on the silicon steel sheet above, realizing the magnetic attraction and positioning of the silicon steel sheet. As the stacking progresses, the stacking thickness gradually increases, and the magnetic attraction on the upper silicon steel sheet gradually weakens. After the thickness detection sensor device 23 detects the increase in stacking thickness, it drives the lifting adjustment drive unit 22 to move the magnetic suction component 21 upward, adjusting the magnetic attraction distance to ensure the side attraction and positioning of the upper silicon steel sheet. This achieves the purpose of raising and adjusting the magnetic attraction distance of the magnetic suction component 21 as the stacking thickness of the silicon steel sheets increases, ensuring that the magnetic suction component 21 will have a magnetic attraction and positioning effect on all the stacked silicon steel sheets above it, and that the magnetic attraction and positioning force on the upper silicon steel sheet will not be insufficient due to the increase in thickness.

[0044] a2: After each silicon steel sheet is stacked, the elastic clamping device 32 driven by the downward driving part 31 moves downward until the elastic clamping device 32 gradually moves downward and elastically presses on the silicon steel sheet, thereby achieving buffered and protective downward pressure on the silicon steel sheet and improving the compactness of the stacked silicon steel sheets.

[0045] b) Flatness Inspection Section

[0046] During the stacking of silicon steel sheets, flatness testing device 4 should be used to perform multiple flatness tests. During flatness testing, the flatness detection array 42 is first driven downwards by the three-axis servo slide module 41, causing the pressure-type rolling detector 43 to press down on the silicon steel sheet. Then, the three-axis servo slide module 41 drives the flatness detection array 42 to move along the stacking contour of the silicon steel sheets, causing the pressure-type rolling detector 43 to roll on the stacked silicon steel sheets. Because the magnetic suction component 21 maintains its magnetic positioning effect on the silicon steel sheet at all times, the silicon steel sheet will not slide due to the rolling pressure of the pressure-type rolling detector 43. When the pressure of each pressure-type rolling detector 43... When the test values ​​are the same, it means that the silicon steel sheets are stacked flat and subsequent stacking operations can continue. When the pressure test values ​​of some pressure rolling detectors 43 are different from those of other pressure rolling detectors 43, it means that the silicon steel sheets are not stacked flat. In this case, the silicon steel sheets stacked between the previous flatness test and the current flatness test should be removed and re-stacked until the flatness test meets the requirements before continuing the subsequent stacking operations. After all the silicon steel sheets are stacked, a flatness test should be performed again. If the test fails, the silicon steel sheets stacked between the previous flatness test and the current flatness test should be reworked until the flatness test meets the requirements.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for stacking silicon steel sheets for a power transformer core, comprising a stacking system, characterized in that: A stacking method for stacking silicon steel sheets in the core of a power transformer using a stacking system; A magnetic suction component (21) is provided below the stacking table (1) in the stacking system. The magnetic suction component (21) positions the silicon steel sheet on the stacking table (1) by magnetic attraction. Includes a clamping device (3) to elastically clamp the silicon steel sheets on the stacking table; Includes a flatness detection device (4) for rolling flatness detection of the surface of stacked silicon steel sheets; During the stacking of silicon steel sheets, as the stacking thickness increases, the magnetic suction component (21) gradually adjusts its distance from the stacking table (1) to keep all stacked silicon steel sheets within the magnetic suction range, forming magnetic positioning in the vertical direction; as the silicon steel sheets are stacked layer by layer or locally layer by layer, the elastic clamping of the clamping device (3) forms an elastic clamping force from top to bottom, strengthening the stacking compactness of the silicon steel sheets; during the stacking process, the flatness is detected layer by layer or multiple layers by the flatness detection device (4); A thickness detection sensor device (23) is installed above the stacking table in the stacking system. The thickness detection sensor device (23) detects the stacking thickness during the stacking of silicon steel sheets. Based on the thickness detection result, the magnetic suction component (21) is gradually raised and adjusted as the stacking thickness increases through the matching lifting adjustment drive unit (22).

2. The method for stacking silicon steel sheets for a power transformer core as described in claim 1, characterized in that: The magnetic suction component (21), the lifting adjustment drive unit (22), and the thickness detection sensor device (23) correspond one-to-one; there are multiple magnetic suction components (21), which correspond to the central column, upper yoke, lower yoke, and side yoke of the iron core.

3. The method for stacking silicon steel sheets for a power transformer core according to claim 1, characterized in that: The clamping device (3) includes a telescopic elastic clamping member (32), which can be raised and lowered relative to the stacking table (1). When it is necessary to clamp the silicon steel sheet, the telescopic elastic clamping member (32) descends to clamp the silicon steel sheet on the stacking table. When it is necessary to stack the next silicon steel sheet, the telescopic elastic clamping member (32) rises to release the elastic clamping of the silicon steel sheet on the stacking table.

4. The method for stacking silicon steel sheets for a power transformer core according to claim 3, characterized in that: The elastic component of the telescopic elastic clamping member (32) is a pressure sensor spring. During the descent of the telescopic elastic clamping member (32), the pressure sensor spring is gradually compressed from the point of contact with the silicon steel sheet. When the pressure sensor spring detects that the pressure value exceeds the critical value, it maintains the elastic clamping force at this time to elastically clamp the silicon steel sheet on the stacking table.

5. The method for stacking silicon steel sheets for a power transformer core according to claim 4, characterized in that: The clamping force on the silicon steel sheets on the stacking table is adjustable, and the clamping force increases as the pressure sensor spring is compressed.

6. The method for stacking silicon steel sheets for a power transformer core according to claim 5, characterized in that: Each part of the iron core, including the central column, upper yoke, lower yoke, and side yoke, corresponds to at least two elastic clamping members (32). All elastic clamping members (32) corresponding to the same part of the iron core are installed at the same height on the same mounting plate (33), and the elastic clamping members (32) on the same mounting plate (33) are in the same vertical plane, forming a double-point clamping structure or a multi-point clamping structure.

7. The method for stacking silicon steel sheets for a power transformer core according to claim 1, characterized in that: The flatness detection device (4) includes a walking flatness detection array (42), which has several pressure rolling detectors (43) arranged in an array. The flatness detection array (42) moves along the contour trajectory of the iron core, so that each pressure rolling detector (43) rolls on the surface of the silicon steel sheet. By the difference in the pressure value detected by the pressure rolling detector (43), it is determined whether the silicon steel sheet stack is flat.

8. The method for stacking silicon steel sheets for a power transformer core as described in claim 7, characterized in that: The pressure-type rolling detector (43) includes a pressure detection unit (4.3), an elastic support, and a rolling part (4.4) arranged sequentially from top to bottom. The rolling part (4.4) maintains the state of the pressure detection unit (4.3) through the elastic support.

9. The method for stacking silicon steel sheets for a power transformer core as described in claim 8, characterized in that: The walking flatness detection array (42) also includes a honeycomb mount (44) with honeycomb holes (440); each of the pressure rolling detectors (43) is arranged in a linear array on the honeycomb mount (44) corresponding to the honeycomb holes (440) and adapted to the width of the silicon steel sheet.

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