A stator bar VPI hot pressing fixture

Abstract

This utility model discloses a stator bar VPI hot pressing fixture, relating to the field of frame coil processing and production technology. The stator bar VPI hot pressing fixture includes: a base plate; two positioning frames fixedly disposed on the base plate, the two positioning frames being symmetrically arranged along the diagonal of the base plate; a positioning base frame fixedly disposed inside the positioning frames, the positioning base frame having a C-shaped cross-section, and several positioning slots opened at the top of the positioning base frame; and a pressure frame slidably disposed inside the positioning frames, the pressure frame being located above the positioning base frame. This stator bar VPI hot pressing fixture, through the arrangement of the positioning base frame and pressure blocks, fixes the lead end of the bar body, and then limits and fixes the R-angle of the bar body at both ends of the straight iron, ensuring that the shape of the bar body does not easily deform during the hot pressing process, thus improving the yield rate of the hot-pressed product.

Description

Technical Field

[0001] This utility model relates to the field of frame coil processing and production technology, specifically a stator bar VPI hot pressing tool. Background Technology

[0002] VPI (Vacuum Pressure Impregnation) stator bars are key insulation components of stator windings in high-voltage motors (such as hydro-generators and pumped storage units). They are manufactured using vacuum pressure impregnation technology, which involves impregnating epoxy resin under high vacuum to eliminate air gaps within the insulation layer and improve overall insulation integrity. As the heart of the generator, the stator bar is also the most expensive part. Therefore, improving the stability of hot pressing and the consistency of the stator bars during manufacturing is crucial, as their quality directly affects the lifespan of the entire unit. VPI technology, due to its combination of insulation reliability, cost-effectiveness, and automation potential, is gradually replacing multi-adhesive molding processes and becoming the mainstream technology for high-voltage motor stator bars, especially with broad prospects in the fields of hydropower and new energy equipment.

[0003] Currently, during the VPI hot pressing process, the R-corner of the wire rod lacks a positioning device, and there are no support blocks at the upper and lower leads of the wire rod. Prolonged high-temperature baking (150℃, 12h) can easily cause deformation of the copper leads, resulting in inconsistent wire rod quality and affecting the quality of the wire rod after it is unloaded, thereby reducing the pass rate of the wire rod after hot pressing. Utility Model Content

[0004] The purpose of this invention is to provide a stator bar VPI hot pressing fixture to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stator bar VPI hot pressing fixture, comprising: a base plate; two positioning frames fixedly disposed on the base plate, the two positioning frames being symmetrically arranged along the diagonal of the base plate; a positioning base frame fixedly disposed inside the positioning frames, the positioning base frame having a C-shaped cross-section, and the top of the positioning base frame having several positioning slots; a pressure frame slidably disposed inside the positioning frames, the pressure frame being located above the positioning base frame; a pressure plate disposed inside the pressure frame, the bottom end of the pressure plate having several positioning grooves, the positioning slots and positioning grooves being connected when the pressure plate is pressed into the positioning base frame; several bar bodies disposed on the base plate, the lead ends of the bar bodies being located inside the positioning slots and positioning grooves to fix the lead ends; several straight abutments disposed between two adjacent bar bodies, both ends of the straight abutments being fixedly provided with R-angle abutments, the surface of the R-angle abutments being tightly fitted with the R-angle of the bar body.

[0006] Preferably, it further includes: a plurality of reference plates, fixedly mounted on the base plate, with the bottom end of the straight abutment in contact with the surface of the reference plates; a plurality of positioning posts, fixedly mounted on both sides of the reference plates, with an adjustment frame fixedly mounted on the top of the positioning posts; a pressure iron, mounted on the top of the straight abutment; and a plurality of adjusting bolts, threaded onto the adjustment frame and the positioning frame respectively, with the bottom end of the adjusting bolt on the adjustment frame pressing against the surface of the pressure iron, and the bottom end of the adjusting bolt on the positioning frame pressing against the top of the pressure frame.

[0007] Preferably, it further includes: an upper pad strip disposed at the top of the bar body, the top of the upper pad strip being in contact with the bottom of the pressure iron; and a lower pad strip disposed at the bottom of the bar body, the bottom of the lower pad strip being in contact with the surface of the reference plate.

[0008] Preferably, it further includes: two extrusion blocks disposed in the middle of several straight iron blocks, the side of the extrusion block being in contact with the surface of the adjacent straight iron block, and the cross-section of the extrusion block being a right-angled triangle; a trapezoidal block inserted between the two extrusion blocks, the top of the trapezoidal block being in contact with the surface of the iron block; and a screw fixedly connected between several reference plates.

[0009] Preferably, it further includes: a square through hole, formed on the positioning post; and a wedge block inserted into the square through hole, the bottom end of the wedge block being tightly fitted to the surface of the pressure iron.

[0010] Preferably, it further includes: a plurality of fixed through holes, which are formed through the pressure plate and the pressure frame; a mounting block, which is inserted into the fixed through holes; and a locking pin, which is inserted into the fixed through holes and is tightly fitted with the mounting block.

[0011] Preferably, it further includes: a limiting through hole, which is opened through the pressure frame; and a limiting bolt, which is fixedly installed inside the limiting through hole.

[0012] This utility model provides a VPI hot pressing fixture for stator bars, which has the following advantages:

[0013] (1) By setting up a positioning base and a pressure block, the lead end of the wire body is fixed. Then, by using the R-angle irons at both ends of the straight iron, the R-angle of the wire body is limited and fixed, so that the shape of the wire body is not easily deformed during the hot pressing process, thus improving the qualification rate of the product after hot pressing.

[0014] (2) This utility model adds an adjustment frame and adjustment bolts to the upper part of the original positioning column and wedge block by adjusting the pressure iron. By changing the height of the adjustment bolts, the downward pressure is controlled to prevent deformation of the upper pressure iron. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is an exploded view of the internal structure of the positioning frame in this utility model;

[0017] Figure 3 This is a schematic diagram showing the overall structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the overall internal structure of this utility model;

[0019] Figure 5 For practical purposes Figure 1 Enlarged schematic diagram of the structure of region A in the middle.

[0020] In the diagram: 1. Base plate; 2. Positioning frame; 3. Positioning base frame; 4. Positioning slot; 5. Pressure frame; 6. Pressure plate; 7. Positioning groove; 8. Mounting block; 9. Locking pin; 10. Limiting through hole; 11. Limiting bolt; 12. Fixing through hole; 13. Linear bar body; 14. Straight guide iron; 15. Lower pad strip; 16. Upper pad strip; 17. Positioning post; 18. Adjusting bracket; 19. Adjusting bolt; 20. Pressure iron; 21. Square through hole; 22. Wedge block; 23. Extrusion block; 24. Trapezoidal block; 25. Reference plate; 26. Screw; 27. R-angle guide iron. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: Referring to 1-5, in this embodiment, a stator bar VPI hot pressing fixture includes: a base plate 1; two positioning frames 2 fixedly disposed on the base plate 1, the two positioning frames 2 being symmetrically arranged along the diagonal of the base plate 1; a positioning base frame 3 fixedly disposed inside the positioning frames 2, the positioning base frame 3 having a C-shaped cross-section, and a plurality of positioning slots 4 opened at the top of the positioning base frame 3; a pressure frame 5 slidably disposed inside the positioning frames 2, the pressure frame 5 being located above the positioning base frame 3; a pressure plate 6 disposed inside the pressure frame 5, the bottom end of the pressure plate 6 having a plurality of positioning grooves 7, the positioning slots 4 and the positioning grooves 7 being connected when the pressure plate 6 is pressed into the positioning base frame 3; and a plurality of bar bodies. 13, set on the base plate 1, the lead end of the bar body 13 is located inside the positioning slot 4 and positioning groove 7 to fix the lead end; several straight abutments 14 are located between two adjacent bar bodies 13, and R-angle abutments 27 are fixedly set at both ends of the straight abutments 14. The surface of the R-angle abutments 27 is tightly fitted with the R-angle of the bar body 13. By setting the positioning slot 4 and positioning groove 7, the lead of the bar body 13 can be fixed to prevent it from deforming due to excessive stability during hot pressing. By setting the R-angle abutments 27, the R-angle of the bar body 13 can be positioned and fixed to prevent deformation and improve the pass rate of the product after hot pressing.

[0023] It also includes: several reference plates 25, fixedly set on the base plate 1, with the bottom end of the straight abutment 14 in contact with the surface of the reference plate 25; several positioning posts 17, fixedly set on both sides of the reference plate 25, with an adjustment frame 18 fixedly set at the top of the positioning post 17; a pressure iron 20, set at the top of the straight abutment 14; and several adjusting bolts 19, respectively threaded on the adjustment frame 18 and the positioning frame 2. The bottom end of the adjusting bolt 19 on the adjustment frame 18 abuts against the surface of the pressure iron 20, and the bottom end of the adjusting bolt 19 on the positioning frame 2 abuts against the top of the pressure frame 5. By setting the reference plate 25, correction can be performed to prevent deformation after hot pressing. By setting the adjusting bolts 19, the pressure iron 20 can be supported to prevent the deformation force of the bar body 13 from being too large and causing the pressure iron 20 to deform. The position of the pressure frame 5 can also be adjusted to facilitate the fixing and disassembly of the pins of the bar body 13.

[0024] It also includes: an upper pad 16, which is set at the top of the bar body 13, and the top of the upper pad 16 is in contact with the bottom of the pressure iron 20; and a lower pad 15, which is set at the bottom of the bar body 13, and the bottom of the lower pad 15 is in contact with the surface of the reference plate 25. It can wrap the bar body 13 by cooperating with the straight iron 14 to prevent it from deforming during the hot pressing process.

[0025] It also includes: two extrusion blocks 23, which are disposed in the middle of several straight iron blocks 14, with the side of the extrusion block 23 in contact with the surface of the adjacent straight iron block 14, and the cross section of the extrusion block 23 being a right-angled triangle; a trapezoidal block 24, which is inserted between the two extrusion blocks 23, with the top of the trapezoidal block 24 in contact with the surface of the pressure iron 20; and a screw 26, which is fixedly connected between several reference plates 25. The extrusion blocks 23 can fix the wire rod body 13 by cooperating with the trapezoidal block 24, thereby improving the stability during the hot pressing process.

[0026] It also includes: a square through hole 21, which is opened on the positioning post 17; and a wedge block 22, which is inserted into the square through hole 21. The bottom end of the wedge block 22 is in close contact with the surface of the pressure iron 20, so as to press the pressure iron 20 tightly.

[0027] It also includes: several fixed through holes 12, which are opened through the pressure plate 6 and the pressure frame 5; a mounting block 8, which is inserted into the fixed through holes 12; and a locking pin 9, which is inserted into the fixed through holes 12. The locking pin 9 fits tightly with the mounting block 8 and can fix the pressure plate 6.

[0028] It also includes: a limiting through hole 10, which is opened through the pressure frame 5; and a limiting bolt 11, which is fixedly installed inside the limiting through hole 10 to prevent the pressure frame 5 from deforming.

[0029] This utility model provides a VPI hot pressing fixture for stator wire rods, the specific working principle of which is as follows:

[0030] The worker places the bar body 13 to be hot-pressed onto the reference plate 25. During placement, the lower pad 15 is placed below the bar body 13, followed by the placement of the straight guide iron 14 between adjacent bar bodies 13. Two pressing blocks 23 are placed in the middle, and a trapezoidal block 24 is inserted between the two pressing blocks. Then, the lead end of the bar body 13 is inserted into the positioning slot 4 on the positioning base 3. Afterward, the upper pad 16 is placed on top of the bar body 13, and the pressing iron 20 and the installation adjustment bracket 18 are covered. The wedge-shaped block 22 is inserted into the square through hole 21 to press and fix the pressure iron 20. During the pressing of the pressure iron 20, the trapezoidal block 24 goes into the space between the two pressing blocks 23, so that the pressure block 23 and the pressure iron 20 simultaneously press the bar body 13, thus fixing the bar body 13. After fixing, the workers rotate the adjusting bolt 19 in sequence to apply force to the pressure iron 20 to prevent deformation. The pressure frame 5 is applied force to make the pressure plate 6 go into the positioning base frame 3 to position and support the lead end of the bar body 13.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stator bar VPI hot press tooling characterized by: include: Base plate (1); Two positioning frames (2) are fixedly set on the base plate (1), and the two positioning frames (2) are symmetrically set along the diagonal of the base plate (1); The positioning base (3) is fixedly installed inside the positioning frame (2). The positioning base (3) has a C-shaped cross section and several positioning slots (4) are provided at the top of the positioning base (3). The pressure frame (5) is slidably set inside the positioning frame (2), and the pressure frame (5) is located above the positioning base frame (3); The pressure plate (6) is set inside the pressure frame (5). The bottom end of the pressure plate (6) is provided with several positioning grooves (7). When the pressure plate (6) is pressed into the positioning base frame (3), the positioning slot (4) and the positioning groove (7) are connected. Several bar bodies (13) are set on the base plate (1), and the lead ends of the bar bodies (13) are located inside the positioning slots (4) and positioning grooves (7) so that the lead ends are fixed. Several straight guide irons (14) are located between two adjacent rod bodies (13). Both ends of the straight guide irons (14) are fixedly provided with R-angle guide irons (27). The surface of the R-angle guide irons (27) is closely attached to the R-angle of the rod body (13).

2. A stator bar VPI hot press tooling according to claim 1, characterized in that: Also includes: Several reference plates (25) are fixedly set on the base plate (1), and the bottom end of the straight iron (14) is in contact with the surface of the reference plate (25); Several positioning posts (17) are fixedly installed on both sides of the reference plate (25), and an adjustment frame (18) is fixedly installed at the top of the positioning posts (17). The pressure iron (20) is set at the top of the straight iron (14); Several adjusting bolts (19) are threaded onto the adjusting frame (18) and the positioning frame (2), respectively. The bottom end of the adjusting bolt (19) on the adjusting frame (18) abuts against the surface of the pressure iron (20), and the bottom end of the adjusting bolt (19) on the positioning frame (2) abuts against the top of the pressure frame (5).

3. A stator bar VPI hot press tooling according to claim 2, characterized in that: Also includes: The upper pad (16) is set at the top of the bar body (13), and the top of the upper pad (16) is in contact with the bottom of the pressure iron (20); The lower pad (15) is set at the bottom end of the bar body (13), and the bottom end of the lower pad (15) is in contact with the surface of the reference plate (25).

4. A stator bar VPI hot press tooling according to claim 3, wherein: Also includes: Two extrusion blocks (23) are set in the middle of several straight iron blocks (14). The side of the extrusion block (23) is in contact with the surface of the adjacent straight iron block (14). The cross section of the extrusion block (23) is a right triangle. A trapezoidal block (24) is inserted between two extrusion blocks (23), and the top of the trapezoidal block (24) is in contact with the surface of the pressure iron (20); a screw (26) is fixedly connected between several reference plates (25).

5. A stator bar VPI hot press tooling according to claim 2, characterized in that: Also includes: A square through hole (21) is provided on the positioning post (17); A wedge block (22) is inserted into a square through hole (21), and the bottom end of the wedge block (22) is in close contact with the surface of the pressure iron (20).

6. A stator bar VPI hot press tooling according to claim 1, characterized in that: Also includes: Several fixed through holes (12) are opened through the pressure plate (6) and the pressure frame (5); the mounting block (8) is inserted into the fixed through holes (12); The locking pin (9) is inserted into the fixed through hole (12), and the locking pin (9) is tightly fitted with the mounting block (8).

7. The stator bar VPI hot pressing fixture according to claim 1, characterized in that: Also includes: A limiting through hole (10) is opened through the pressure frame (5); The limiting bolt (11) is fixedly installed inside the limiting through hole (10).

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