A flat winding forming device for a half-turn type rotor coil of a steam turbine generator

Abstract

The present invention discloses a flat winding forming device for a half-turn type rotor coil of a steam turbine generator, which comprises a first chassis (1) and a second chassis (2). A flat winding rotating mechanism is arranged inside the second chassis (2), and the output end of the flat winding rotating mechanism extends outside the second chassis (2). A lining ring (3) and a fastening nut (4) are sleeved on the output end of the flat winding rotating mechanism. One side of the first chassis (1) is provided with an adjustable first positioning plate (5), at least one first positioning hole is formed in the first positioning plate (5), and a first pin is movably inserted into the first positioning hole. A positioning assembly is slidably arranged on one side of the second chassis (2), and the positioning assembly is located at the outer side end of the lining ring (3). The present invention has the advantages of improving the processing and forming efficiency and having higher processing dimension accuracy.

Description

Technical Field

[0001] The invention relates to the field of processing copper busbars with holes, in particular to a flat-winding forming device for a half-turn rotor coil of a steam turbine generator. Background Art

[0002] As a core component of a turbine generator, the manufacturing process for its rotor coils is crucial. A turbine rotor coil consists of 12-14 windings, each consisting of 18-22 turns of copper bar. Each turn in each winding group is of uniform length and arranged in equal widths. Before forming the ends, process holes are drilled or milled midway between the length and width of the bar. After the ends of the rotor bar are formed, the difference between the ends and the center of the positioning holes must not exceed 0.5mm, and the total length of the formed ends must not exceed 1mm. Each rotor coil turn is formed at each end of the 4000mm-long bar. Existing flat-coil winding equipment can only rotate 90 degrees on one side, making it extremely difficult to meet these product requirements. Excessive dimensional deviations can significantly complicate subsequent rotor wire insertion and pose safety risks to the overall operation of the motor.

[0003] Currently, when forming half-turn rotor coils for 40MW and 50MW steam turbines, a forming ring is installed at the sidewinder's rotating section, based on the copper bar thickness and the inner corner radius (R). The starting point of the copper bar bend is adjusted, and the sidewinder's top plate is used to press the bar securely. Simultaneously, the clamping device is activated to clamp the bar up and down. The sidewinder's rotating component rotates 90 degrees clockwise to form one end of the rotor coil. During the return stroke, the sidewinder's pressing and clamping devices are released, and the rotor bar is stretched a certain distance along the sidewinder's worktable. A length positioning rod is used to press the formed coil end with one end and the other end against the sidewinder's pressure head. The sidewinder's pressing and clamping devices are activated to form the other end. This forming method generally results in a 2-3mm oversize in the length direction. If the rotor bar has a center positioning hole, process testing has shown that the distance between the ends and the center hole is generally 2-4mm. Forming rotor coils with center positioning holes using this method does not meet product requirements.

[0004] In patent CN202020554969.4, a forming die for a rotor coil in the technical field of forming dies for rotor coils is disclosed. A convex pressing plate is fixedly assembled at the center of the bottom of the upper die. A plug-in installation groove is formed at the top of the mounting seat. A plug-in column adapted to the plug-in installation groove is integrally formed at the bottom of the lower die. A bending and forming groove adapted to the convex pressing plate is formed at the center of the top of the lower die. A top pressing groove is formed at the bottom of the bending and forming groove. A bending and positioning step is fixedly arranged on one side of the top of the lower die close to the bending and forming groove. Positioning grooves adapted to the positioning columns are formed at the four corners of the top of the lower die. The coil can be formed into a predetermined arc shape in one step. This patent improves the processing accuracy and efficiency, is convenient for only replacing the lower die when coils of different arc model specifications are needed, is easy to operate, other parts can be reused, has a high error tolerance rate, and at the same time has a low use cost and high processing efficiency. However, it cannot solve the problem of dimensional differences in the processing of half-turn rotor coils.

[0005] In patent CN201820608378.3, a forming die for a rotor coil is disclosed, which includes an upper die and a lower die. A square-shaped positioning block protrudes on the lower die. One end of the positioning block is a triangular bending wall. Positioning steps are arranged on both sides of the lower die along the positioning block. Arc-shaped positioning grooves are arranged on the positioning steps close to the side wall of the forming block. A "V"-shaped bending and forming step is arranged on the lower die along the bending wall of the positioning block. A contact convex edge is arranged at the middle position of the contact of the bending and forming step. The upper die is provided with a plurality of pressing blocks. The pressing blocks are arranged in a circle to form a fitting groove matching the positioning block. Pressing grooves corresponding to the positioning grooves are arranged on the pressing blocks. An inverted "V"-shaped top pressing step is arranged on one side of the upper die. A contact concave edge corresponding to the contact convex edge is arranged on the top pressing step. After the positioning block is inserted into the pressing groove, the top pressing step and the bending and forming step are arranged at intervals. This patent achieves the technical effect of reliable and convenient forming, thus improving the production efficiency. However, it also cannot solve the problem of dimensional differences in the processing of half-turn rotor coils. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a flat winding forming device for a half-turn rotor coil of a steam turbine generator, so as to solve the above defects.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] A flat winding forming device for a half-turn rotor coil of a steam turbine generator includes:

[0009] The first chassis and the second chassis, a flat winding rotating mechanism is arranged inside the second chassis, and the output end of the flat winding rotating mechanism extends outside the second chassis; a lining ring and a fastening nut are sleeved on the output end of the flat winding rotating mechanism; one side of the first chassis is provided with an adjustable first positioning plate, at least one first positioning hole is formed in the first positioning plate, and a first pin is movably inserted into the first positioning hole; a positioning component is slidably arranged on one side of the second chassis, and the positioning component is located on the outer side end of the lining ring.

[0010] Further, an adjusting component for adjusting the position of the first positioning plate is arranged on the side surface of the first chassis. The adjusting component includes two fixing bars fixed on the outer side surface of the first frame, a first sliding member is slidably arranged on the fixing bars, and the extending end of the first sliding member penetrates through the first positioning plate and is fixed by a fixing member.

[0011] Further, four adjusting holes arranged in a rectangular array are formed in the first positioning plate, and the first sliding member is located in the corresponding adjusting hole.

[0012] Further, side pressing blocks are arranged on the outer side surface of the second chassis, and the side pressing blocks are located on both sides of the lining ring.

[0013] Further, the positioning component includes a connecting plate slidably arranged on the outer side surface of the second chassis, a second positioning plate is fixed outside the connecting plate through a second pin, a third pin is further inserted into the second positioning plate, and the extending end of the third pin extends towards the second chassis but does not touch; the inner diameters of the third pin and the first pin are the same.

[0014] Furthermore, a sliding groove is formed in the side surface of the second chassis, a sliding block is slidably arranged in the sliding groove, and the connecting plate is fixed on the outer side of the sliding block.

[0015] Furthermore, the flat winding rotating mechanism includes a numerical control motor installed on the second frame, the lining ring and the fastening nut are sleeved on the output shaft of the numerical control motor, a baffle is further fixed on the side surface of the second frame, the output shaft of the numerical control motor penetrates through the baffle, and the lining ring and the fastening nut are located outside the baffle.

[0016] Advantages of the present invention:

[0017] A flat winding forming device for a half-turn rotor coil of a steam turbine generator proposed by the present invention, through the cooperative setting of the first positioning plate, the positioning component and the copper bar with a positioning through hole, solves the problems of out-of-tolerance of the axial length dimension of each turn of the half-turn rotor coil and out-of-tolerance of the dimensions of the central hole and the two-end processing parts of the copper bar of each half-turn of the half-turn rotor coil; when processing the copper bar, the device respectively positions the same positions, thereby improving the forming efficiency of the half-turn rotor coil. Description of the drawings

[0018] Figure 1 is the front view of the present invention;

[0019] Figure 2 is the schematic structural view of the second chassis and the positioning assembly;

[0020] Figure 3 is the sectional view of the positioning assembly.

[0021] In the figure, 1 - the first chassis, 2 - the second chassis, 21 - the sliding groove, 3 - the lining ring, 4 - the fastening nut, 5 - the first positioning plate, 51 - the adjusting hole, 6 - the fixing strip, 7 - the first sliding member, 8 - the side pressing block, 9 - the connecting plate, 10 - the second pin, 11 - the second positioning plate, 12 - the third pin, 13 - the slider, 14 - the baffle, 15 - the copper bar. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the first embodiment, in this embodiment, as Figures 1 to 3 shown, a flat winding forming device for a half-turn rotor coil of a steam turbine generator includes a first chassis 1 and a second chassis 2. A flat winding rotating mechanism is provided inside the second chassis 2, and the output end of the flat winding rotating mechanism extends outside the second chassis 2; a lining ring 3 and a fastening nut 4 are sleeved on the output end of the flat winding rotating mechanism; a first positioning plate 5 with an adjustable position is provided on one side of the first chassis 1, at least one first positioning hole is opened on the first positioning plate 5, and a first pin is movably inserted into the first positioning hole; a positioning assembly is slidably provided on one side of the second chassis 2, and the positioning assembly is located outside the outer end of the lining ring 3.

[0024] In this embodiment, the device is used to bend both ends of the copper bar 15 by ninety degrees. By pushing the lining ring 3 with the fastening nut 4, the lining ring 3 presses and fixes one end of the copper bar 15. A positioning through hole is opened on the copper bar 15, and the positioning through hole corresponds to the first positioning hole. The first pin is used to correspondingly fix the positioning through hole and the first positioning hole.

[0025] This embodiment is further configured as follows: An adjusting component for adjusting the position of the first positioning plate 5 is provided on the side surface of the first chassis 1. The adjusting component includes two fixing bars 6 fixed to the outer side surface of the first chassis 1. A first sliding member 7 is slidably arranged on the fixing bar 6, and the extending end of the first sliding member 7 penetrates through the first positioning plate 5 and is fixed by a fixing member.

[0026] In this embodiment, a sliding groove is formed on the fixing bar 6. The first sliding member is a square head bolt, and the head of the square head bolt is slidably arranged in the sliding groove. Through the arrangement of the first sliding member, it is convenient to replace the first positioning plates 5 of different models so as to adapt to copper bars 15 of different models.

[0027] This embodiment is further configured as follows: Four adjusting holes 51 arranged in a rectangular array are provided on the first positioning plate 5, and the first sliding member 7 is located in the corresponding adjusting holes 51.

[0028] In this embodiment, the adjusting holes 51 are strip-shaped holes. By changing the position of the first sliding member 7 in the strip-shaped holes on the first positioning plate 5, the length between the first positioning hole and the lining ring 3 can be adjusted, which is convenient for adjusting the flat winding position of the copper bar 15; the fixing member is a nut, and the fixing member is located outside the first positioning plate 5.

[0029] This embodiment is further configured as follows: Side pressing blocks 8 are provided on the outer side surface of the second chassis 2, and the side pressing blocks 8 are located on both sides of the lining ring 3.

[0030] In this embodiment, the side pressing blocks 8 are fixed by bolts. Fixing holes are formed on both sides of the lining ring 3. The side pressing blocks 8 are first fixed to the left side of the lining ring 3, and when the other end of the copper bar 15 is processed, the side pressing blocks 8 are fixed to the right side of the lining ring 3. The outer side surface of the copper bar 15 abuts against the side pressing blocks 8 and is close to the lining ring 3, so that the latter half of the copper bar 15 will not warp during the processing of the copper bar 15.

[0031] This embodiment is further configured as follows: The positioning component includes a connecting plate 9 slidably arranged on the outer side surface of the second chassis 2. A second positioning plate 11 is fixed to the outside of the connecting plate 9 through a second pin 10. A third pin 12 is also inserted on the second positioning plate 11, and the extending end of the third pin 12 extends towards the second chassis 2 but does not touch it; the inner diameter of the third pin 12 is the same as that of the first pin.

[0032] In this embodiment, when processing the other end of the copper bar, the positioning through hole is correspondingly fixed to the third pin 12 to position the distance between the two ends in sequence, so that the axial length dimension of each turn of the rotor coil is more accurate.

[0033] This embodiment is further configured as follows: a chute 21 is formed on the side surface of the second chassis 2, a slider 13 is slidably arranged in the chute 21, and the connecting plate 9 is fixed to the outer side of the slider 13.

[0034] In this embodiment, the cross-sectional shapes of the chute 21 and the slider 13 are "I"-shaped. The second positioning plate 11, the connecting plate 9 and the outer side surface of the second frame 2 form a placement groove, and the copper bar is located in the placement groove.

[0035] This embodiment is further configured as follows: the flat winding rotating mechanism includes a numerical control motor installed on the second frame 2. The lining ring 3 and the fastening nut 4 are sleeved on the output shaft of the numerical control motor. A baffle 14 is also fixed on the side surface of the second frame 2. The output shaft of the numerical control motor penetrates through the baffle, and the lining ring 3 and the fastening nut 4 are located outside the baffle 14.

[0036] Embodiment 2 discloses a flat winding forming device for a half-turn type rotor coil of a steam turbine generator, which includes a first chassis 1 and a second chassis 2. A flat winding rotating mechanism is arranged in the second chassis 2, and the output end of the flat winding rotating mechanism extends outside the second chassis 2; a lining ring 3 and a fastening nut 4 are sleeved on the output end of the flat winding rotating mechanism; a first positioning plate 5 with an adjustable position is arranged on one side of the first chassis 1. At least one first positioning hole is formed in the first positioning plate 5, and a first pin is movably inserted into the first positioning hole; a positioning assembly is slidably arranged on one side of the second chassis 2, and the positioning assembly is located at the outer side end of the lining ring 3.

[0037] In this embodiment, the first chassis 1 is a fixed chassis for the flat winding machine, and the second chassis 2 is a rotating chassis; this device is used to bend both ends of the copper bar 15 by 90 degrees. By pushing the lining ring 3 with the fastening nut 4, the lining ring 3 presses and fixes one end of the copper bar 15. A positioning through hole is formed in the copper bar 15, and the positioning through hole corresponds to the first positioning hole. The first pin is used to correspondingly fix the positioning through hole and the first positioning hole.

[0038] This embodiment is further configured as follows: an adjusting assembly for adjusting the position of the first positioning plate 5 is arranged on the side surface of the first chassis 1. The adjusting assembly includes two fixing bars 6 fixed on the outer side surface of the first frame 1. A first sliding member 7 is slidably arranged on the fixing bar 6, and the extending end of the first sliding member 7 penetrates through the first positioning plate 5 and is fixed by a fixing member.

[0039] In this embodiment, a sliding groove is formed on the fixing bar 6. The first sliding member is formed by screwing a bolt and a rear seat nut. The rear seat nut has a rectangular structure and is slidably arranged in the sliding groove. The position of the first positioning plate 5 is adjusted by the rear seat nut, so as to facilitate the replacement of first positioning plates 5 of different models to adapt to copper bars 15 of different models.

[0040] This embodiment is further configured as follows: Four adjustment holes 51 arranged in a rectangular array are provided on the first positioning plate 5, and the first sliding member 7 is located in the corresponding adjustment holes 51.

[0041] In this embodiment, the adjustment holes 51 are strip-shaped holes. By changing the position of the first sliding member 7 in the strip-shaped holes on the first positioning plate 5, the length between the first positioning hole and the lining ring 3 can be adjusted, which is convenient for adjusting the flat winding position of the copper bar 15; the fixing member is a nut and is located outside the first positioning plate 5.

[0042] This embodiment is further configured as follows: Side pressing blocks 8 are arranged on the outer side surface of the second chassis 2, and the side pressing blocks 8 are located on both sides of the lining ring 3.

[0043] In this embodiment, four side pressing blocks 8 are provided, and two of them are arranged on the left and right sides of the lining ring 3 respectively. When the first end of the copper bar 15 is processed, it is limited by the two side pressing blocks 8 located on the left side of the lining ring 3. When the second end of the copper bar 15 is processed, it is limited by the two side pressing blocks 8 located on the right side of the lining ring 3. Fixing holes are formed on both sides of the lining ring 3, and the side pressing blocks 8 are fixed to the corresponding fixing holes by bolts. The outer side surface of the copper bar 15 abuts against the side pressing blocks 8 and is close to the lining ring 3, so that when the two ends of the copper bar 15 are processed respectively, the other end section of the copper bar 15 will not warp.

[0044] This embodiment is further configured as follows: The positioning assembly includes a connecting plate 9 slidably arranged on the outer side surface of the second chassis 2. A second positioning plate 11 is fixed to the outside of the connecting plate 9 through a second pin 10. A third pin 12 is also inserted on the second positioning plate 11, and the extending end of the third pin 12 extends towards the second chassis 2 but does not touch it; the inner diameter of the third pin 12 is the same as that of the first pin.

[0045] In this embodiment, when the other end of the copper bar is processed, the positioning through hole is correspondingly fixed to the third pin 12 to position the distance between the two ends in sequence, so that the axial length dimension of each turn of the rotor coil is more accurate.

[0046] This embodiment is further configured as follows: A sliding groove 21 is formed on the side surface of the second chassis 2, and a slider 13 is slidably arranged in the sliding groove 21. The connecting plate 9 is fixed to the outside of the slider 13.

[0047] In this embodiment, the cross-sectional shapes of the chute 21 and the slider 13 are inverted T-shaped. The second positioning plate 11, the connecting plate 9 and the outer side surface of the second frame 2 form a placement groove, and the copper bar is located in the placement groove.

[0048] This embodiment is further configured as follows: The flat winding rotating mechanism includes a numerical control motor installed on the second frame 2. The lining ring 3 and the fastening nut 4 are sleeved on the output shaft of the numerical control motor. A baffle 14 is also fixed on the side surface of the second frame 2. The output shaft of the numerical control motor penetrates through the baffle, and the lining ring 3 and the fastening nut 4 are located outside the baffle 14.

[0049] The working principle of the present invention:

[0050] When assembling the device, the lining ring sleeve 3 is sleeved on the output shaft of the flat winding rotating mechanism of the flat winding machine, and then the lining ring 3 is pressed tightly by the fastening nut 4; then the first positioning plate 5 with the first positioning holes is installed on the fixed base of the flat winding machine, and the distance between the center of the lining ring 3 and the first positioning hole on the first positioning plate 5 is adjusted. Then, the side pressing block 8 is installed on the rotating base of the flat winding machine; a positioning assembly is installed on the rotating base of the flat winding machine, and the distance between the second positioning hole and the center of the lining ring 3 is adjusted. When adjusting, the elongation rate during the forming of the copper bar 15 needs to be considered. In order to improve the forming efficiency of the rotor coil, two copper bars 15 are formed at one time during forming;

[0051] As Figure 1 shown, when in use, when forming the first group of rotor windings, the two turns of copper bars are arranged neatly, strung together with the first pin, and inserted into the first first positioning hole of the first positioning plate 5. Then, one end of the copper bar 15 is fixed between the baffle 14 and the lining ring 3 through the fastening nut 4. Then, the first pin on the first positioning plate 5 is pulled out. Because the copper bar 15 needs to be wound around the lining ring 3 during forming and the tail of the copper bar 15 needs to move forward, the numerical control motor is started, so that one end of the copper bar 15 is bent downward by ninety degrees. After one end is formed, the fastening nut 4 is loosened, and the copper bar 15 is pulled out a certain distance towards the second base 2 (as Figure 2 shown), then the two turns of copper bars are positioned on the positioning assembly with the third pin 12, and then the fastening nut 4 is tightened, and then the numerical control motor is restarted to form the end of the other end of the copper bar of the rotor coil.

[0052] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, terms such as "arrangement", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A flat winding forming device for a half-turn type rotor coil of a turbo-generator, characterized in that, Comprising: A first chassis (1) and a second chassis (2), a flat winding rotating mechanism is arranged inside the second chassis (2), and the output end of the flat winding rotating mechanism extends outside the second chassis (2); a lining ring (3) and a fastening nut (4) are sleeved on the output end of the flat winding rotating mechanism; a first positioning plate (5) with an adjustable position is arranged on one side of the first chassis (1), at least one first positioning hole is opened on the first positioning plate (5), and a first pin is movably inserted into the first positioning hole; a positioning assembly is slidably arranged on one side of the second chassis (2), and the positioning assembly is located at the outer side end of the lining ring (3). An adjusting assembly for adjusting the position of the first positioning plate (5) is arranged on the side surface of the first chassis (1), the adjusting assembly includes two fixing bars (6) fixed on the outer side surface of the first chassis (1), a first sliding member (7) is slidably arranged on the fixing bars (6), and the extending end of the first sliding member (7) penetrates through the first positioning plate (5) and is fixed by a fixing member. The positioning assembly includes a connecting plate (9) slidably arranged on the outer side surface of the second chassis (2), a second positioning plate (11) is fixed outside the connecting plate (9) through a second pin (10), a third pin (12) is also inserted on the second positioning plate (11), and the extending end of the third pin (12) extends towards the second chassis (2) but does not touch; the inner diameters of the third pin (12) and the first pin are the same.

2. The flat winding forming device for a half-turn rotor coil of a steam turbine generator according to claim 1, wherein: Four adjusting holes (51) arranged in a rectangular array are provided on the first positioning plate (5), and the first sliding member (7) is located in the corresponding adjusting hole (51).

3. A flat winding forming device for a half-turn type rotor coil of a turbogenerator according to claim 1, characterized in that: Side pressing blocks (8) are arranged on the outer side surface of the second chassis (2), and the side pressing blocks (8) are located on both sides of the lining ring (3).

4. A flat winding forming device for a half-turn rotor coil of a steam turbine generator according to claim 1, characterized in that: A chute (21) is opened on the side surface of the second chassis (2), a slider (13) is slidably arranged in the chute (21), and the connecting plate (9) is fixed on the outer side of the slider (13).

5. A flat winding forming device for a half-turn rotor coil of a steam turbine generator according to claim 1, characterized in that: The flat winding rotating mechanism includes a numerical control motor installed on the second chassis (2), the lining ring (3) and the fastening nut (4) are sleeved on the output shaft of the numerical control motor, a baffle (14) is also fixed on the side surface of the second chassis (2), the output shaft of the numerical control motor penetrates through the baffle, and the lining ring (3) and the fastening nut (4) are located outside the baffle (14).

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