A transformer sealing ring sector plate step splicing and processing technology and its special assembly tool

Abstract

The present invention relates to a transformer sealing ring sector plate step splicing process method and a special assembly tool thereof, belonging to the technical field of power transformer insulation production and manufacturing. The technical solution is as follows: a clamping device includes a base (11) and a clamping mechanism slidably arranged on a processing table (33) and two auxiliary clamping mechanisms. The base (11) is arranged above the processing table (33). The placement angle of the base (11) on the processing table (33) is adjustable. The two auxiliary clamping mechanisms are symmetrically arranged on the left and right sides of the base. The two auxiliary clamping mechanisms clamp the base (11) above the processing table. One end of the processed sector plate (2) is clamped on the base through the clamping mechanism. The base of the present invention can be adjusted in angle according to the size of the sealing ring sector plate to ensure that the step line of the processed sector plate passes through the center of the circle. The clamping mechanism and the auxiliary clamping mechanism can position and lock the base and the sector plate, thereby improving processing stability.

Description

Technical Field

[0001] The invention relates to a transformer sealing ring sector plate step splicing and processing technology and a special assembly tool thereof, belonging to the technical field of production and manufacturing of power transformer insulation parts. Background Art

[0002] Among the complete set of insulation components in power transformers, sealing rings are made from high-density laminated insulating paperboard made from pure kraft wood pulp. Thicknesses range from a few millimeters to 90 millimeters, offering high mechanical strength and rigidity. Placed at the upper and lower ends of the transformer coils, they act as a sealant and insulator. Currently, a common method for producing sealing rings involves machining them directly into a circular shape using machining centers. However, due to their large circumferential diameter, these rings are difficult to manufacture and can suffer from dimensional deviations. In particular, the production of narrow-width sealing rings can lead to low raw material utilization and high overall production costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a transformer sealing ring fan plate step splicing and processing process and a special assembly tool. The sealing ring is segmented into several fan plates, and the steps are processed at the head and tail ends of the fan plates. The fan plates are overlapped and spliced ​​at the head and tail steps, or the fan plates are butt-jointed and inserted into the connecting plate to splice the head and tail steps. This solves the problems of difficulty in sealing ring processing and high overall production cost of narrow-width sealing rings. At the same time, due to the large circumferential diameter of the sealing ring, each fan plate needs to be fastened and assembled to each other, so the central symmetry and dimensional accuracy of the steps on them are very high. To this end, the present invention also provides a special assembly tool that can solve the problems of difficult clamping and poor processing stability caused by the large diameter, different thickness, and different radial dimensions of the fan plates. It can improve the accuracy of the step processing dimensions and the flatness of the processing surface on the fan plates, meet the quality requirements of the components, improve processing quality and efficiency, and reduce processing costs.

[0004] The technical solution of the present invention is:

[0005] A special combination tool for processing the steps of a transformer sealing ring sector plate includes a clamping device, which is arranged on a processing table of a horizontal milling processing equipment. The clamping device includes a base, a clamping mechanism and two auxiliary clamping mechanisms that are arranged to slide left and right on the processing table. The base is arranged above the processing table, and the placement angle of the base on the processing table is adjustable. The two auxiliary clamping mechanisms are symmetrically arranged on the left and right sides of the base. The two auxiliary clamping mechanisms clamp the base above the processing table, and one end of the processed sector plate is clamped to the base through the clamping mechanism.

[0006] Furthermore, a boss is provided on one side edge of the base, and the end of the processed sector plate is close to the boss to position the processed sector plate.

[0007] Furthermore, the upper end surface of the base is provided with two symmetrically arranged positioning threaded holes. When the radial width of the sector plate is small, positioning screws are provided on the two positioning threaded holes at the same time. The upper ends of the two positioning screws protrude from the upper surface of the base, and the inner diameter side and outer diameter side of the processed sector plate are close to the two positioning screws, and the two positioning screws position the processed sector plate; when the radial width of the sector plate is large, a positioning screw is provided on the positioning threaded hole located on the inner diameter side of the processed sector plate, and the upper end of the positioning screw protrudes from the upper surface of the base, and the inner diameter side of the processed sector plate is close to the positioning screw, and the positioning screw positions the processed sector plate.

[0008] Furthermore, threaded blind holes are provided on the three sides of the base, and the number of threaded blind holes is not limited. The outer side of each threaded blind hole can be matched with a side baffle, and the side baffle is provided with a side baffle circular hole. The side baffle bolt passes through the side baffle circular hole and is screwed into the threaded blind hole to fix the side baffle on the side of the base. The side baffle contacts the side of the processing table. By selecting a suitable threaded blind hole to install the side baffle, the angle α between the base and the processing table is adjusted. At the same time, the base can be positioned on the processing table of the horizontal milling equipment through the side baffle to keep the angle α unchanged.

[0009] Specifically, place the base on the machining table, select the appropriate threaded blind hole to install the side guard, and adjust the angle α between the base and the machining table to the preset angle, so that the centerline of the base boss passes through the center of the circle. When machining the fan-shaped plate, the boss on the base is always parallel to the end of the fan-shaped plate to ensure that the edge line of the machined fan-shaped plate step passes through the center of the circle.

[0010] Furthermore, the processing table is provided with a T-slot 1 and a T-slot 2 arranged parallel to each other in front and back, the clamping mechanism is slidably arranged on the T-slot 1, and the two auxiliary clamping mechanisms are slidably arranged on the T-slot 2.

[0011] Furthermore, the clamping mechanism includes a fixing screw, a wide-side nut, a T-shaped screw, a long pressure plate and a spiral washer. Two through slots are symmetrically arranged on the left and right sides of the base. A pressure plate groove is provided on the long pressure plate. The fixing screw passes through the pressure plate groove and one of the through slots. The bottom of the fixing screw is threadedly connected to the T-shaped screw. The T-shaped screw is slidably arranged in the T-slot of the processing table. A spiral washer is placed under one end of the long pressure plate. The spiral washer is located on the upper end surface of the processing table. The other end of the long pressure plate extends toward the fan plate and is located above the fan plate. Tighten the wide-side nut to press the long pressure plate against the fan plate.

[0012] Furthermore, the auxiliary clamping mechanism includes a second fixing screw, a second T-screw, a short pressure plate, a second wide-side nut and a second spiral washer. The short pressure plate is provided with a second pressure plate groove. The second fixing screw is passed through the second pressure plate groove. The bottom of the second fixing screw is threadedly connected to the second T-screw. The second T-screw is slidably set in the second T-slot of the processing table. The second spiral washer is placed under one end of the short pressure plate. The second spiral washer is located on the upper end surface of the processing table. The other end of the short pressure plate extends toward the base and is located above the base. Tighten the second wide-side nut so that the short pressure plate locks the base on the processing table.

[0013] The clamping mechanism uses a wide-edge nut 1 to press and fix the long pressure plate, the fan-shaped plate, and the spiral washer 1 in sequence from top to bottom. The two auxiliary clamping mechanisms use a wide-edge nut 2 to press and fix the short pressure plate, the base, and the spiral washer 2 in sequence from top to bottom.

[0014] A transformer sealing ring sector plate step splicing and processing process, processing steps on the processed sector plate, using the above-mentioned special device, performing milling processing, the steps are as follows:

[0015] ① According to the different diameters of the sealing ring, select the appropriate number of equal parts of the sector plate;

[0016] ② According to the different thickness and size of the sealing ring, select the appropriate sector plate splicing method;

[0017] ③Measure and mark the position of the step to be processed at the end of the fan-shaped plate;

[0018] ④Install and adjust the clamping device: According to the diameter of the sealing ring to be processed, adjust the angle α between the base and the processing table, install the side baffle for positioning, install the positioning screw, install the clamping mechanism and two auxiliary clamping mechanisms, and lock the base on the processing table through the two auxiliary clamping mechanisms;

[0019] ⑤Prepare the milling cutter;

[0020] ⑥Adjust the processing table and milling cutter position;

[0021] ⑦ Clamping the fan-shaped plate: Place one end of the fan-shaped plate flat on the base, adjust the position of the fan-shaped plate, and fix the fan-shaped plate on the base through the clamping mechanism;

[0022] ⑧Adjust the equipment feed parameters: use the reverse milling method, control the milling cutter speed to maintain 600r / min~900r / min, and the worktable feed speed to 180mm / min~200mm / min;

[0023] ⑨ Milling the steps: Control the worktable to feed at a constant speed and mill out the steps at the end of the sector plate. After milling the steps at one end of the sector plate, move the X-axis horizontally in the opposite direction to the processing table and return the milling cutter to its initial position.

[0024] ⑩ Check whether the required size has been achieved: If not, return the processing table and milling cutter to their original positions, remove the sector plate, adjust the position of the clamping device, and repeat steps ⑦, ⑧, and ⑨ until the required size is achieved; if it has been achieved, loosen the clamping mechanism, remove the sector plate, and place the end of the sector plate with the step milled facing outwards and the step facing downwards; place the other end of the sector plate to be processed facing the milling cutter, re-place it in a suitable position on the base and clamp it, and continue processing the step on the other end of the sector plate until all the steps of the sector plate are processed;

[0025] Remove the fan plate;

[0026] Deal with step burrs;

[0027] Check if a coupling plate is required; if no coupling plate is required, continue with step If there is a connecting plate, follow the steps After inserting the coupling plate, continue with step

[0028] Insert the connecting plate;

[0029] Trial assembly;

[0030] Make a mark;

[0031] Apply glue to the steps;

[0032] Use callan to tighten the joints;

[0033] Punch rivet holes;

[0034] Riveting;

[0035] Deal with burrs.

[0036] Furthermore, in step ③, the position of the step to be processed is marked. The specific steps are: the step edge line of the fan-shaped plate needs to pass through the center of the circle, confirm the inner and outer chord dimensions of the step part, and use a pen to mark the position of the step to be processed on the fan-shaped plate. Fan-shaped plates of different diameters need to be marked first.

[0037] Furthermore, the specific steps of step ⑩ are: check whether it has been processed to the required size. If it has not been processed to the required size, return the processing table and the milling cutter to their positions, loosen the wide-side nut 1, loosen the long pressure plate, remove the fan-shaped plate, adjust the position of the clamping device, and repeat steps ⑦, ⑧, and ⑨ for milling until the required size is reached; if it has been processed to the required size, loosen the wide-side nut 1, loosen the long pressure plate, remove the fan-shaped plate, and mill the fan-shaped plate with one end of the step facing outward and the step facing downward, and face the end of the fan-shaped plate to be processed toward the milling cutter. After re-placement in the appropriate position on the base and clamping, continue with the processing of the next step until the step processing of all fan-shaped plates is completed.

[0038] Furthermore, the specific steps of step ⑦ are: place one end of the fan-shaped plate flat on the base of the clamping device, adjust the position of the fan-shaped plate so that one end face of the fan-shaped plate is close to the boss of the base, the fan-shaped plate is close to the positioning screw on the base, and rotate the wide-side nut 1 to move the long pressure plate downward to fix the clamping fan-shaped plate.

[0039] The beneficial effects of the present invention are as follows: (1) The process of splicing the fan-shaped plates at the ends with overlapping steps or inserting the fan-shaped plates at the ends with connecting plates is adopted, which solves the problems of difficult processing of sealing rings and high overall production costs of narrow-width sealing rings. The splicing process is efficient, stable and reliable, ensuring the roundness of multiple fan-shaped plates on the circumference of the sealing ring after splicing, and reducing processing costs. (2) The clamping device has accurate positioning, high processing precision, high speed, and is convenient and fast. It solves the problems of inconvenient clamping of fan-shaped plates, vibration, large sawing resistance, poor stability, and dimensional deviation, meets the high precision and flatness requirements of the steps of the fan-shaped plates of the sealing ring, improves processing stability, processing quality and processing efficiency, and reduces labor intensity. The clamping device is suitable for clamping fan-shaped plates of different diameters, different thicknesses, and different radial widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the step splicing structure of the sealing ring sector plate of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the sealing ring sector plate step connecting plate of the present invention;

[0042] Figure 3 This is a top view of the fan-shaped plate step of the present invention;

[0043] Figure 4 is a side view of the sector plate step of the present invention;

[0044] Figure 5 This is a top view of the splicing portion of the fan-shaped plate steps of the present invention;

[0045] Figure 6 This is a side view of the splicing portion of the fan-shaped plate step of the present invention;

[0046] Figure 7 This is a top view of the sector plate step of the present invention riveted by the connecting plate;

[0047] Figure 8 This is a side view of the sector plate step of the present invention riveted by the connecting plate;

[0048] Figure 9 is a top view of the connecting plate of the present invention;

[0049] Figure 10 It is a flow chart of the processing method of the present invention;

[0050] Figure 11 is a top view of the base of the present invention;

[0051] Figure 12 is a side view of the base of the present invention;

[0052] Figure 13 It is a schematic structural diagram of the clamping device of the present invention;

[0053] Figure 14 is a top view of the clamping device of the present invention;

[0054] Figure 15 It is a schematic diagram of the working of the present invention;

[0055] Figure 16 This is a schematic structural diagram of a T-screw rod according to the present invention;

[0056] Figure 17 1. It is a top view of the T-screw of the present invention;

[0057] In the figure: sealing ring 1, sector plate 2, step 3, connecting plate 4, outlet groove 5, rivet hole 6, pin 7, joint seam 8, air escape groove 9, base 11, weight reduction groove 12, weight reduction hole 13, threaded blind hole 14, side baffle 15, side baffle circular hole 16, side baffle bolt 17, boss 18, positioning threaded hole 19, positioning screw 20, through groove 21, fillet 22, fixing screw 1 23-1, fixing screw 2 23-2, wide-edge nut 1 2 4-1, wide-edge nut 2 24-2, T-slot 1 25-1, T-slot 2 25-2, T-screw 1 26-1, T-screw 2 26-2, straight slot 26A, oblong plate 26B, short pressure plate 27, long pressure plate 28, pressure plate groove 1 29-1, pressure plate groove 2 29-2, pressure plate slope 30, pressure plate bevel 31, spiral washer 1 32-1, spiral washer 2 32-2, processing table 33, milling cutter 34, dust suction pipe 35. DETAILED DESCRIPTION

[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0059] Refer to the attached Figure 11-15A special combination tool for processing the steps of the fan-shaped plate of the transformer sealing ring includes a clamping device, which is arranged on the processing table 33 of the horizontal milling processing equipment. The clamping device includes a base 11 and a clamping mechanism arranged on the processing table 33 for sliding left and right, as well as two auxiliary clamping mechanisms.

[0060] Refer to the attached Figure 11 and 12 The base 11 is provided with a weight-reducing groove 12 at the bottom, and a number of weight-reducing holes 13 are symmetrically arranged on the left and right sides of the base 11 to reduce the weight of the base while ensuring the supporting strength of the base. Four threaded blind holes 14 are provided on the side of the base 11, two of which are symmetrically arranged on the front side of the base, and the other two threaded blind holes 14 are symmetrically arranged on the left and right sides of the base. The outside of each threaded blind hole 14 can be matched with a side baffle 15, and the side baffle 15 is provided with a side baffle circular hole 16. The side baffle bolt 17 passes through the side baffle circular hole 16 and is screwed into the threaded blind hole 14 to fix the side baffle 15 to the side of the base 11.

[0061] Two symmetrically arranged positioning threaded holes 19 are provided on the front side of the upper end face of the base 11. In this embodiment, two positioning screws 20 are respectively inserted into the corresponding positioning threaded holes 19. The upper ends of the two positioning screws 20 protrude from the upper surface of the base 11. The inner diameter side and outer diameter side of the processed sector plate 2 are close to the two positioning screws 20. The two positioning screws 20 position the processed sector plate 2. Two through grooves 21 are symmetrically provided on the left and right sides of the base 11. A linear boss 18 is provided at the front edge of the base 11. The two corners of the rear side of the base 11 are provided with rounded corners 22 to prevent scratches on people and the sector plate. The entire surface of the base 11 is blackened to prevent rust and contamination of the sector plate. The edges of the base are blunted to prevent scratches on people and the sector plate.

[0062] According to the different diameters and radial dimensions of the sector plate being processed, the base 11 needs to be adjusted to different angles with the processing table 33 and the milling cutter 34 to ensure that the step edge line of the processed sector plate passes through the center of the circle. The angle adjustment between the base 11 and the processing table 33 is achieved by selecting a suitable threaded blind hole to install the side baffle. The side baffle is clamped on the side of the processing table 33 to keep the angle between the base 11 and the processing table 33 unchanged.

[0063] In this embodiment, the angle α between the base 11 and the processing table 33 is constant. In order to ensure that the angle α between the base 11 and the processing table 33 remains unchanged, a side baffle can be installed by selecting a threaded blind hole on the left side of the base so that the side baffle is stuck on the side of the processing table 33, so that the base remains tilted to the right and the angle α remains unchanged.

[0064] Preferably, the side guards can be steel plates such as rectangular plates or bent plates. When the angle α between the base 11 and the processing table 33 is 0 degrees, a rectangular plate can be used, parallel to the side of the processing table 33. When the angle α between the base 11 and the processing table 33 is greater than 0 degrees, a rectangular plate can be used, with the side edges of the rectangular plate clamped against the side of the processing table 33; alternatively, a bent plate can be used, with the bending angle being the same as the angle α between the base 11 and the processing table 33, with one side of the bent plate connected to the base 11 and the other side clamped against the side of the processing table 33.

[0065] Preferably, in order to ensure machining accuracy, a linear boss 18 is provided on the front edge of the base. When machining the fan-shaped plate, the placement angle of the base is adjusted so that the center line of the boss of the base passes through the center of the circle, the fan-shaped plate is placed flat on the base, the end of the fan-shaped plate 2 is closely aligned with the boss 8 on the base 11, the end of the fan-shaped plate is parallel to the center line of the boss, the fan-shaped plate 2 is close to the positioning screw 20, and then the clamping mechanism is used to clamp the fan-shaped plate 2 to ensure that the edge line of the processed fan-shaped plate step passes through the center of the circle.

[0066] Refer to the attached Figure 13-15 The two auxiliary clamping mechanisms have the same structure and are symmetrically arranged on the left and right sides of the base 11. The auxiliary clamping mechanism includes a fixed screw 23-2, a T-screw 26-2, a short pressure plate 27, a spiral washer 32-2 and a wide-side nut 24-2; the fixed screw 23-2 passes through the pressure plate groove 29-2 of the short pressure plate 27, and the bottom of the fixed screw 23-2 is threadedly connected to the T-screw 26-2, and the T-screw 26-2 is slidably set in the T-slot 25-2 of the processing table 33. One side of the short pressure plate 27 is supported on the processing table 33 by the spiral washer 32-2, and the other side of the short pressure plate 27 is pressed tightly on the base 11. The upper end of the fixed screw 23-2 is provided with a wide-side nut 24-2. By tightening the wide-side nut 24-2, the short pressure plate 27, the spiral washer 32-2 and the base 11 are pressed and fixed on the processing table 33.

[0067] The clamping mechanism includes a fixed screw 23-1, a T-screw 26-1, a long pressure plate 28, a wide-edge nut 24-1, and a spiral washer 32-1; the fixed screw 23-1 is set in the through slot 21 of the base 11, the bottom of the fixed screw 23-1 is threadedly connected to the T-screw 26-1, and the bottom of the fixed screw 23-1 and the T-screw 26-1 extend out of the through slot 21 of the base 11 and then slide into the T-slot of the processing table 33. The pressing plate groove 29-1 of the long pressing plate 28 passes through the fixing screw 23-1, and one side of the long pressing plate 28 is supported on the processing table 33 through the spiral washer 32-1. The other side of the long pressing plate 28 is pressed tightly on the fan-shaped plate 2, and a wide-side nut 24-1 is provided at the upper end of the fixing screw 23-1. By tightening the wide-side nut 24-1, the long pressing plate 28 is pressed downward to tighten the spiral washer 32-1 and the fan-shaped plate 2, thereby pressing and fixing the fan-shaped plate 2 on the base 11.

[0068] Both sides of the short pressing plate 27 and the long pressing plate 28 are provided with pressing plate slopes 30 and pressing plate angles 31 to prevent collisions with personnel and workpieces.

[0069] The wide-edge nut 1 24-1 and the wide-edge nut 2 24-2 are both integral structures of nuts and washers, which avoids the tediousness of repeatedly adjusting the washers. At the same time, the bottom edge is widened to facilitate the tightening operation of the ratchet wrench on the fixed screw 1 and the fixed screw 2.

[0070] Both T-screw 1 (26-1) and T-screw 2 (26-2) have straight grooves 26A at their bases to prevent them from interfering with T-slot 1 (25-1) and T-slot 2 (25-2), respectively, on the processing table 33. The bottoms of both fixing screw 1 (23-1) and T-screw 25 are equipped with oblong plates 26B, which fit into T-slot 1 (25-1) and T-slot 2 (25-2), respectively. When wide-edge nuts 1 (24-1) and 2 (24-2) are tightened, T-screw 1 (26-1) and T-screw 2 (26-2) are kept relatively fixed.

[0071] A transformer sealing ring sector plate step splicing and processing process, which processes steps on the processed sector plate and uses the above-mentioned special combination tool for milling, is characterized by the following steps:

[0072] ① According to the different diameters of the sealing ring 1, select the appropriate number of equal parts of the sector plate 2;

[0073] ② According to the different thicknesses of the sealing ring 1, select the appropriate splicing method of the sector plate 2;

[0074] ③ Measure and mark the position of the step 3 to be processed at the end of the sector plate 2;

[0075] ④ Install and adjust the clamping device: adjust the angle α between the base 11 and the processing table 33 according to the diameter of the sealing ring 1 to be processed, install the side baffle 15 for positioning, install the two positioning screws 20, install the clamping mechanism and the two auxiliary clamping mechanisms, and lock the base 11 on the processing table 33 through the two auxiliary clamping mechanisms;

[0076] ⑤ Prepare the milling cutter 34;

[0077] ⑥ Adjust the position of the processing table 33 and the milling cutter 34;

[0078] ⑦ Clamping the fan-shaped plate 2: Place one end of the fan-shaped plate flat on the base 11, adjust the position of the fan-shaped plate, and fix the fan-shaped plate on the base 11 through the clamping mechanism;

[0079] ⑧Adjust the equipment feed parameters: use the reverse milling method, control the milling cutter speed to maintain 600r / min~900r / min, and the worktable feed speed to 180mm / min~200mm / min;

[0080] ⑨ Milling the steps: Control the worktable to feed at a constant speed and mill out the steps at the end of the sector plate. After milling the steps at one end of the sector plate, move the X-axis horizontally in the opposite direction to the processing table and return the milling cutter to its initial position.

[0081] ⑩ Check whether the required size has been achieved: If the required size has not been achieved, return the processing table and milling cutter to their original positions, remove the fan-shaped plate, adjust the position of the clamping device, and repeat the milling process of steps ⑦, ⑧, and ⑨ until the required size is achieved; If the required size has been achieved, loosen the clamping mechanism, remove the fan-shaped plate, and place the end of the fan-shaped plate with the step milled facing outwards, with step (3) facing downwards; Place the other end of the fan-shaped plate to be processed toward the milling cutter, re-place it in a suitable position on the base and clamp it, and continue to process the step at the other end of the fan-shaped plate until all the steps of the fan-shaped plate are processed;

[0082] Remove the fan plate;

[0083] Deal with step burrs;

[0084] Check if a coupling plate is required; if no coupling plate is required, continue with step If there is a connecting plate, follow the steps After inserting the coupling plate, continue with step

[0085] Insert the connecting plate;

[0086] Trial assembly;

[0087] Make a mark;

[0088] Apply glue to the steps;

[0089] Use callan to tighten the joints;

[0090] Punch rivet holes;

[0091] Riveting;

[0092] Deal with burrs.

[0093] The specific steps of step ① are: according to the outer diameter size of the sealing ring 1, calculate the appropriate number of fan-shaped plates 2, and set the splicing amount on each fan-shaped plate 2. When the thickness of the fan-shaped plate 2 is thinner, the splicing amount is selected as a shorter size, and when the thickness of the fan-shaped plate 2 is thicker, the splicing amount is selected as a longer size.

[0094] The specific steps of step ② are: when the thickness of the fan-shaped plate 2 is relatively thin, a direct splicing method of the step 3 is adopted; when the thickness of the fan-shaped plate 2 is relatively thick, a splicing method of the connecting plate 4 is adopted.

[0095] Step ③ is to mark the position of the step 3 to be processed. The specific steps are as follows: the edge line of the step 3 of the sector plate 2 needs to pass through the center of the circle, confirm the inner and outer chord dimensions of the step 3, and use a red and blue pencil or EDDING 3000 pen to mark the position of the step 3 to be processed on the sector plate 2. Sector plates 2 of different diameters all need to be marked first.

[0096] The specific steps of step ④ are: determining the angle between the step 3 and the milling cutter 34 according to the different diameters of the sealing ring 1, and adjusting and fixing the base 11.

[0097] The specific steps of step ⑤ are as follows: according to the different thicknesses of the sector plate 2, a corresponding milling cutter 34 is selected; when the thickness of the sector plate 2 is t≤10mm, a milling cutter 34 of φ14mm is selected to process the step (3); when the thickness of the sector plate 2 is 10mm<t≤30mm, a milling cutter 34 of φ20mm is selected to process the step 3; when the thickness of the sector plate 2 is 30mm<t≤50mm, a milling cutter 34 of φ14mm is selected to process the step 3; when the thickness of the sector plate 2 is 50mm<t≤90mm, a milling cutter 34 of φ20mm is selected to process the step 3; when the thickness of the sector plate 2 is t>90mm, a milling cutter 34 of φ30mm is selected to process the step 3, and the milling cutter 34 is a three-edge straight shank milling cutter.

[0098] The specific steps of step ⑦ are: place one end of the fan-shaped plate 2 flat on the base 11 of the clamping device, adjust the position of the fan-shaped plate 2 so that one end face of the fan-shaped plate 2 is close to the boss 18 of the base 11, and the inner diameter side and / or outer diameter side of the fan-shaped plate 2 is close to the positioning screw 20 on the base 11, rotate the wide-side nut 24-1, and move the long pressure plate 28 downward to fix the fan-shaped plate 2.

[0099] The specific steps of step ⑧ are: adopting the reverse milling method, controlling the milling cutter speed to maintain 600r / min~900r / min, and the workbench feed speed to 180mm / min~200mm / min.

[0100] The specific steps of step ⑩ are: check whether it has been processed to the required size. If it has not been processed to the required size, return the processing table 33 and the milling cutter 34 to their positions, loosen the wide-side nut 24-1, loosen the long pressure plate 28, remove the sector plate 2, adjust the position of the clamping device, and repeat steps ⑦, ⑧, and ⑨ milling until the required size is reached; if it has been processed to the required size, loosen the wide-side nut 24-1, loosen the long pressure plate 28, remove the sector plate 2, and mill one end of the sector plate 2 with the step 3 milled outward and the step 3 facing downward, and face the other end of the sector plate 2 to be processed toward the milling cutter 34, re-place it in the appropriate position on the base 11 and clamp it, and continue processing the step 3 at the other end of the sector plate until the steps 3 of all sector plates 2 are processed.

[0101] The steps The specific steps are: check whether the connecting plate 4 is needed, if there is no connecting plate 4, then continue step If there is a connecting plate 4, follow the steps After inserting the coupling plate, continue with step

[0102] The steps The specific steps are: after the step 3 of the fan-shaped plate 2 is completed, the two fan-shaped plates 2 are spliced ​​together; a fan-shaped plate 2 is placed above the splicing seam 8, and the position of the fan-shaped plate 2 is adjusted to ensure that the arc at the step 3 is consistent with the arc of the fan-shaped plate 2, and the splicing seam 8 of the step 3 and the connecting plate 4 is less than 1 mm.

[0103] The steps The specific steps are: after the trial installation is suitable, mark the two adjacent sector plates 2, including the corresponding connecting plates 4.

[0104] The steps The specific steps are: after the step 3 is glued together, the overflowing glue needs to be removed.

[0105] The steps The specific steps are: when the sector plate 2 is radially narrow, two rivet holes 6 are punched at the step 3; when the sector plate 2 is radially wide, four rivet holes 6 are punched at the step 3. The rivet holes 6 are blind holes, and the hole depth is about 4 mm from the bottom surface of the sector plate 2.

[0106] The steps The specific steps are as follows: the pin 7 is made of φ10mm laminated cardboard, needs to be dried in the oven in advance, and the air escape groove 9 needs to be thinned by 1mm on one side. The length of the pin 7 is 5mm smaller than the thickness of the sector plate 2. The pin 7 is inserted into the rivet hole 6. The upper end of the pin 7 must not be exposed to the surface of the sector plate 2. If the pin 7 breaks during the riveting process, the pin 7 needs to be shaved flat and a rivet hole 6 is drilled next to it for riveting.

[0107] The milling cutter described in step ⑤ is provided with three cutting edges.

[0108] In conjunction with the embodiments below, Figure 10 and 15 The working diagram is shown, and the detailed steps are as follows:

[0109] Place the base 11 of the clamping device on the processing table 33 of the horizontal milling equipment. When using the overlapping splicing method, in order to reduce the splicing seam 8 and make the step 3 of the sector plate 2 fit together, it is necessary to adjust the angle α between the base 11 and the processing table 33 to ensure that the edge line of the milled step 3 passes through the center of the circle. Slide the T-screws 1 (26-1) and 2 (26-2) at the bottoms of the fixing screws 1 (23-1) and 2 (23-2) from the sides of the machining table 33 into the T-slots 2 (25-2) and 1 (25-1) of the machining table 33, respectively. The upper end of the fixing screw 2 (23-2) passes through the pressure plate groove 2 (29-2) of the short pressure plate 27. One side of the short pressure plate 27 is supported on the machining table 33 by the spiral washer 2 (32-2). Tighten the wide-edge nut 2 (24-2) on the fixing screw 2 (23-2) to press the other side of the short pressure plate 27 against the base 11, thereby firmly securing the base 11 to the machining table 33. Screw the two positioning screws 20 into the positioning threaded holes 19, ensuring that the upper ends of the two positioning screws 20 protrude from the upper surface of the base 11. The protruding portions of the two positioning screws 20 do not exceed the height of the step 3 of the sector plate 2 to be machined.

[0110] In order to facilitate the rapid adjustment of the angle α between the positioning base 11 and the processing table 33, the side guard bolt 17 is screwed into the threaded blind hole 14 on the front side of the base 11 through the side guard circular hole 16, and the side guard 15 is fixed to the front side of the base 11, and the side guard 15 is close to the edge of the processing table 33.

[0111] Place one end of the fan plate 2 on the base 11 of the clamping device so that one end face of the fan plate 2 is close to the boss 18 of the base 11. In order to make the clamping of the fan plate 2 more secure and the processing more stable and reliable, and to prevent the fan plate 2 from rotating or loosening along the circumferential direction during processing, the inner diameter side and the outer diameter side of the fan plate 2 are close to the positioning screw 20 of the base 11, and the wide-side nut 24-1 on the fixing screw 23-1 is screwed to move the long pressure plate 28 downward. One end of the long pressure plate 28 presses the spiral washer 32-1, and the other end of the long pressure plate 28 presses the fan plate 2, thereby ensuring the stability of the fan plate 2 during processing.

[0112] Adjust the positions of the processing table 33 and the milling cutter 34 so that the milling cutter 34 is located at the starting position of the step 3 to be processed on the sector plate 2.

[0113] Adjust the feed parameters of the horizontal milling equipment, that is, adjust the spindle speed to between 600 and 900 r / min, the moving speed of the equipment processing table 33 to 180 to 200 mm / min, and use the reverse milling method to ensure that there is no jamming during the processing and the processed surface is smooth and flat.

[0114] Control the processing table 33 to feed at a uniform speed in the X-axis direction, so that the processing table 33 and the fan-shaped plate 2 slowly move toward the milling cutter 34, control the moving speed of the processing table 33, control the cutting amount of the milling cutter 34, and take "small cutting amount and slow milling" as the principle to make the fan-shaped plate 2 contact the milling cutter 34. When the fan-shaped plate 2 adopts the overlapping splicing method, the step 3 can be directly milled. At the same time, the dust suction tube 35 is aimed at the step 3 to promptly absorb and clean the paper scraps generated during the processing. When the fan-shaped plate 2 adopts the docking insertion connecting plate splicing method, the position of the milling cutter 34 should be adjusted to the middle part of the thickness direction of the fan-shaped plate 2, that is, the plug-in position of the connecting plate 4 is milled out. After milling the step 3 at one end of the fan-shaped plate 2, the X-axis moves the processing table 3 in the opposite direction to return the milling cutter 34 to its initial position.

[0115] It is worth noting that during the milling process, the dust suction pipe 35 needs to be aligned with the portion of the step 3 to be processed to suck away the debris in time and keep the milling smooth.

[0116] In view of the fact that the size of step 3 in the Y-axis direction is large and the milling cutter 34 is likely to break under stress, the milling position of the milling cutter 34 can be adjusted to half of the size of the step 3 to be processed in the Y-axis direction. After half of the step 3 is milled, the processing table 33 is moved in the opposite direction of the X-axis horizontally, and the milling cutter 34 is returned to the initial position. The processing table 33 is adjusted in the horizontal direction of the Y-axis so that the milling cutter 34 can mill to the root of the step 3 until the step 3 is completely milled out, thereby obtaining a smoother machined surface.

[0117] After the step 3 is processed, the X-axis moves the processing table 33 in the opposite horizontal direction, returns the milling cutter 34 to the initial position, loosens the wide-side nut 24-1 on the fixing screw 23-1, and removes the sector plate 2.

[0118] Processing workpiece burrs.

[0119] In this embodiment, when the thickness of the fan-shaped plate is relatively thin, a milling cutter of φ14mm is selected to process the step; when the thickness of the fan-shaped plate is moderate, a milling cutter of φ20mm is selected to process the step; when the thickness of the fan-shaped plate is relatively thick, a milling cutter of φ30mm is selected to process the step.

[0120] The connecting plate is cut by a band saw, and the burrs are smoothed by a sander, a knife, sandpaper, etc. The size of the connecting plate matches the size of the processed step, and the negative tolerance of the connecting plate size is controlled.

[0121] If the sealing ring is provided with a wire outlet groove, the position of the wire outlet groove should be far away from the step joint of the sector plate.

[0122] The trial assembly process requires splicing multiple sector plates together, adjusting the splicing position size, ensuring that the arc of the splicing is consistent with the arc of the sector plate, and after the trial assembly is suitable, marking is done in sequence on adjacent sector plates, including the connecting plate.

[0123] The joint seam between the step and the connecting plate is less than 1 mm.

[0124] After the step is glued and bonded, the overflowed glue needs to be cleaned.

[0125] The rivet holes are blind holes, and the hole depth is about 4 mm from the bottom surface of the sector plate.

[0126] When the sector plate is radially narrow, two rivet holes are punched at the step portion; when the sector plate is radially wide, four rivet holes are punched at the step portion.

[0127] The pins are made of φ10mm laminated cardboard and need to be dried in the oven in advance. A 1mm thin air escape groove needs to be removed on one side. The pins are inserted into the rivet holes, and the upper end of the pins must not be exposed on the surface of the fan-shaped board.

[0128] After processing the fan-shaped plate, align the end edges of multiple fan-shaped plates, insert the connecting plate at the step of the fan-shaped plate, use the clamp to clamp the step connection part of the fan-shaped plate, use a hand drill to drill rivet holes at the step connection part, and insert rivets to ensure that the entire sealing ring is connected tightly.

[0129] Figure 1 and Figure 2 Sealing rings made from two different overlapping processes. Figure 1It is a sealing ring sector plate step splicing structure. It is a circular ring as a whole and is made of several sector plates spliced ​​together on the circumference. Steps are set at both ends of each sector plate. The steps of two adjacent sector plates are set up and down and connected by pins. Figure 2 It is a sealing ring sector plate step connecting plate structure. It is a circular ring as a whole and is made of several sector plates spliced ​​together on the circumference. Steps are set in the middle of the two ends of each sector plate. The adjacent sector plates are connected by connecting plates and pins.

Claims

1. A special combination tool for machining steps of transformer sealing ring sector plates, characterized by: The invention comprises a clamping device, wherein the clamping device is arranged on a processing table (33) of a horizontal milling processing device, the clamping device comprises a base (11), a clamping mechanism and two auxiliary clamping mechanisms which are arranged on the processing table (33) and slide left and right. The base (11) is arranged above the processing table (33), and the placement angle of the base (11) on the processing table (33) is adjustable. The two auxiliary clamping mechanisms are symmetrically arranged on the left and right sides of the base (11). The two auxiliary clamping mechanisms clamp the base (11) above the processing table (33), and one end of the processed sector plate (2) is clamped on the base (11) through the clamping mechanism. The upper end surface of the base (11) is provided with two symmetrically arranged positioning threaded holes (19), and positioning screws (20) are provided on the two positioning threaded holes (19). The upper ends of the two positioning screws (20) protrude from the upper surface of the base (11), and the inner diameter side and the outer diameter side of the processed sector plate (2) are close to the two positioning screws (20). The two positioning screws (20) position the processed sector plate (2); or the positioning screw (20) is provided on the positioning threaded hole (19) on the inner diameter side of the processed sector plate (2), and the upper ends of the positioning screws (20) protrude from the upper surface of the base (11), and the inner diameter side of the processed sector plate (2) is close to the positioning screws. (20), the positioning screw (20) positions the processed sector plate (2); threaded blind holes (14) are provided on the three sides of the base (11), and the outer side of each threaded blind hole (14) can be matched with a side baffle (15), and the side baffle (15) is provided with a side baffle circular hole (16). The side baffle bolt (17) passes through the side baffle circular hole (16) and is screwed into the threaded blind hole (14), fixing the side baffle (15) to the side of the base (11), and the side baffle (15) contacts the side of the processing table (33). By selecting a suitable threaded blind hole to install the side baffle, the angle α between the base and the processing table is adjusted; The processing table (33) is provided with a T-slot 1 (25-1) and a T-slot 2 (25-2) arranged parallel to each other in the front and back directions; a clamping mechanism is arranged on the T-slot 1 (25-1) for sliding left and right; and two auxiliary clamping mechanisms are arranged on the T-slot 2 (25-2) for sliding left and right. The clamping mechanism comprises a fixed screw (23-1), a wide-edge nut (24-1), a T-shaped screw (26-1), a long pressure plate (28) and a spiral washer (32-1). Two through grooves (21) are symmetrically provided on the left and right sides of the base (11). A pressure plate groove (29-1) is provided on the long pressure plate (28). The fixed screw (23-1) passes through the pressure plate groove (29-1) and one of the through grooves (21). The bottom thread of the fixed screw (23-1) Connect a T-screw rod (26-1), which is slidably set in a T-slot (25-1) of a processing table (33), and a spiral washer (32-1) is placed under one end of the long pressure plate (28). The spiral washer (32-1) is located on the upper end surface of the processing table (33). The other end of the long pressure plate (28) extends toward the fan-shaped plate (2) and is located above the fan-shaped plate (2). Tighten the wide-side nut (24-1) so that the long pressure plate (28) presses the fan-shaped plate (2).

2. A special combined tool for machining steps of a transformer sealing ring sector plate according to claim 1, characterized in that: A boss (18) is provided on one side edge of the base (11), and the end of the processed sector plate (2) is close to the boss (18) to position the processed sector plate (2).

3. The special combined tool for machining the step of the transformer sealing ring sector plate according to claim 1, characterized in that: The auxiliary clamping mechanism comprises a second fixing screw (23-2), a second T-shaped screw (26-2), a short pressure plate (27), a second wide-edge nut (24-2) and a second spiral washer (32-2). The short pressure plate (27) is provided with a second pressure plate groove (29-2). The second fixing screw (23-2) is passed through the second pressure plate groove (29-2). The bottom of the second fixing screw (23-2) is threadedly connected to the second T-shaped screw (26-2). The second T-shaped screw (2 6-2) is slidably arranged in the T-slot 2 (25-2) of the processing table (33), and a spiral washer 2 (32-2) is placed under one end of the short pressure plate (27). The spiral washer 2 (32-2) is located on the upper end surface of the processing table. The other end of the short pressure plate (27) extends toward the base (11) and is located above the base (11). Tighten the wide-side nut 2 (24-2) so that the short pressure plate (27) locks the base (11) to the processing table (33).

4. A transformer sealing ring sector plate step splicing and processing process, processing the steps on the processed sector plate, using the special combination tool according to any one of claims 1-3 for milling, characterized in that The steps are as follows: ① According to the different diameters of the sealing ring (1), select the appropriate number of equal parts of the sector plate (2); ② According to the different thicknesses of the sealing ring (1), select the appropriate splicing method of the fan-shaped plate (2); ③ Measure and mark the position of the step (3) to be processed at the end of the fan-shaped plate (2); ④ Install and adjust the clamping device: according to the diameter of the sealing ring (1) to be processed, adjust the angle α between the base (11) and the processing table (33), install the side baffle (15) for positioning, install the positioning screw (20), install the clamping mechanism and the two auxiliary clamping mechanisms, and lock the base (11) on the processing table (33) through the two auxiliary clamping mechanisms; ⑤ Prepare the milling cutter (34); ⑥ Adjust the position of the processing table (33) and the milling cutter (34); ⑦ Clamping the fan-shaped plate (2): Place one end of the fan-shaped plate flat on the base (11), adjust the position of the fan-shaped plate, and fix the fan-shaped plate on the base (11) through the clamping mechanism; ⑧Adjust the equipment feed parameters: use the reverse milling method, control the milling cutter speed to maintain 600r / min~900r / min, and the worktable feed speed to 180mm / min~200mm / min; ⑨ Milling the steps: Control the worktable to feed at a constant speed and mill out the steps at the end of the sector plate. After milling the steps at one end of the sector plate, move the X-axis horizontally in the opposite direction to the processing table and return the milling cutter to its initial position. ⑩ Check whether the required size has been achieved: If the required size has not been achieved, return the processing table and milling cutter to their original positions, remove the fan-shaped plate, adjust the position of the clamping device, and repeat the milling process of steps ⑦, ⑧, and ⑨ until the required size is achieved; If the required size has been achieved, loosen the clamping mechanism, remove the fan-shaped plate, and place the fan-shaped plate with the end of the step milled facing outwards and the step (3) facing downwards; Place the other end of the fan-shaped plate to be processed toward the milling cutter, re-place it in a suitable position on the base and clamp it, and continue to process the steps on the other end of the fan-shaped plate until all the steps of the fan-shaped plate are processed; Remove the sector plate; Deal with step burrs; Check whether a connecting plate is required; if no connecting plate is required, proceed to step ⑮. If a connecting plate is required, insert the connecting plate according to step ⑭ and proceed to step ⑮. Insert the connecting plate; Trial assembly; Make a mark; Apply glue to the steps; Use callan to tighten the joints; Punch rivet holes; Riveting; Deal with burrs.

5. The transformer sealing ring sector plate step splicing and processing technology according to claim 4 is characterized in that Step ③ marks the position of the step (3) to be processed, and the specific steps are as follows: the edge line of the step (3) of the fan-shaped plate (2) needs to pass through the center of the circle, confirm the inner and outer chord sizes of the step (3) part, and mark the position of the step (3) to be processed on the fan-shaped plate (2) with a pen. Fan-shaped plates (2) of different diameters all need to be marked with lines first.

6. The transformer sealing ring sector plate step splicing and processing process according to claim 4, characterized in that The specific steps of step ⑩ are as follows: Check whether the required size has been processed. If not, return the processing table (33) and the milling cutter (34) to their original positions, loosen the wide-side nut (24-1), loosen the long pressure plate (28), remove the fan-shaped plate (2), adjust the position of the clamping device, and repeat the milling process of steps ⑦, ⑧, and ⑨ until the required size is reached; if the required size has been processed, loosen the wide-side nut (24-1), loosen the long pressure plate (28), remove the fan-shaped plate (2), and place the fan-shaped plate (2) with one end of the step (3) facing outward and the step (3) facing downward, and place the other end of the fan-shaped plate (2) to be processed toward the milling cutter (34), re-place it in a suitable position on the base (11) and clamp it, and continue to process the step (3) at the other end of the fan-shaped plate until the steps (3) of all fan-shaped plates (2) are processed.

7. The transformer sealing ring sector plate step splicing and processing process according to claim 4, characterized in that The specific steps of step ⑦ are as follows: place one end of the fan-shaped plate (2) flat on the base (11) of the clamping device, adjust the position of the fan-shaped plate (2) so that one end surface of the fan-shaped plate (2) is close to the boss (18) of the base (11), the fan-shaped plate (2) is close to the positioning screw (20) on the base (11), and rotate the wide-side nut (24-1) to move the long pressure plate (28) downward to fix the fan-shaped plate (2).

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