Processing technology of corona-resistant enameled copper flat wire

Abstract

The invention discloses a processing technology of a corona-resistant enameled copper flat wire, which comprises the following steps: sequentially carrying out wire drawing, calendering and drawing treatment on a round copper wire with the diameter phi of 12.5 mm to prepare a copper flat wire, then cleaning the surface of the copper flat wire, removing residual wire drawing oil and copper powder on the surface of the copper flat wire, and attaching cleaning liquid to the surface of the copper wire after cleaning to obtain a copper wire C; then the C copper wire is subjected to annealing treatment, the cleaning liquid on the surface of the C copper wire is evaporated into water vapor in the annealing process and wraps the C copper wire, so that oxidation of the C copper wire in the annealing process is relieved, and a D copper wire is obtained; the surface of the D copper wire is coated with a primer layer and a finish paint layer in sequence, the primer layer is formed by coating 240-grade polyimide paint, the finish paint layer is formed by coating corona-resistant polyimide paint, and the finished enameled wire is obtained. According to the invention, the adhesion stability of the paint film on the surface of the enameled copper flat wire can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a processing technology of an enameled wire, in particular to a processing technology of a corona-resistant enameled copper flat wire. BACKGROUND

[0002] Currently, although there is a 240-grade polyimide enameled wire paint on the market, it is difficult for the enameled copper flat wire to achieve a heat resistance level of 240℃. The reason is that the copper wire needs to be sequentially subjected to wire drawing, drawing and annealing processes before the painting process. The wire drawing process is to draw a 12.5mm diameter copper round wire into a 5mm diameter copper round wire. The drawing process is to draw the 5mm diameter copper round wire into a copper flat wire. The annealing process is to anneal the copper flat wire to improve the flexibility of the copper flat wire. On the one hand, the copper wire needs to be lubricated by drawing oil during the wire drawing and drawing processes, so that the drawing oil will be partially left on the surface of the copper wire after lubrication. Moreover, a certain amount of copper powder will be generated during the wire drawing process, which will also adhere to the surface of the copper wire with the drawing oil, so that the copper wire will be hindered by the copper powder and the drawing oil during the subsequent painting process, reducing the adhesion stability of the paint film after coating.

[0003] On the other hand, the copper wire also has the problem of oxidation with the air in the annealing furnace during the annealing process. When the surface of the copper wire is oxidized, the oxidation layer not only causes the surface of the copper wire to form pinhole defects and unevenness, thereby reducing the uniformity of the paint film during coating, but also hinders the close combination between the paint film and the pure copper, greatly reducing the adhesion performance of the paint film. Under the above limitations, the current 240-grade polyimide enameled wire paint is difficult to stably adhere to the surface of the copper flat wire.

[0004] In view of the above defects, although some manufacturers have tried to filter the drawing oil by standing and sedimentation or filter cloth filtration to reduce the copper powder content in the drawing oil, the filtering effect is not ideal. The reason is that the standing and sedimentation method can only separate part of the copper powder with large particle size and heavy mass, while part of the small particle copper powder will be suspended in the middle position of the drawing oil, and the separation effect is relatively poor. Although the filter cloth filtration method can filter the drawing oil by using non-woven fabric, on the one hand, it can only partially suck and filter the drawing oil in the sedimentation tank, and cannot completely treat the drawing oil. On the other hand, as the copper powder continuously accumulates on the surface of the non-woven fabric, the permeability of the non-woven fabric will decrease, thereby reducing the filtering efficiency of the drawing oil, and there is a possibility that the non-woven fabric will be pressed and turned over due to excessive accumulation of the drawing oil. Under the above limitations, even if the manufacturers use the above method to filter the drawing oil, the surface of the copper wire after treatment will still have copper powder, thereby affecting the adhesion stability of the subsequent insulating paint.

[0005] Therefore, the existing processing technology of the enameled copper flat wire has the problem of poor adhesion stability of the paint film. SUMMARY

[0006] The present application aims to provide a processing technology of corona-resistant enameled copper flat wire.

[0007] The technical solution of the present application is a processing technology of corona-resistant enameled copper flat wire, comprising the following steps: ①φ12.5mm copper round wire is subjected to wire drawing treatment to produce φ5mm copper round wire, obtaining A copper wire; ②φ5mm A copper wire is subjected to calendering and drawing treatment to produce copper flat wire, obtaining B copper wire; ③the surface of B copper wire is cleaned to remove the residual wire drawing oil and copper powder on the surface of B copper wire, and the surface of the copper wire is attached with cleaning liquid after cleaning, obtaining C copper wire; ④C copper wire is subjected to annealing treatment, and the cleaning liquid on the surface of C copper wire evaporates into water vapor during the annealing process and wraps C copper wire, thereby relieving the oxidation of C copper wire during the annealing process, obtaining D copper wire; ⑤the surface of D copper wire is coated with a primer layer and a topcoat layer in sequence, wherein the primer layer is coated with 240-grade polyimide paint, and the topcoat layer is coated with corona-resistant polyimide paint, obtaining finished enameled wire.

[0008] In the aforementioned processing technology of corona-resistant enameled copper flat wire, the copper round wire in step ① is lubricated by wire drawing oil during wire drawing treatment, and the A copper wire in step ② is lubricated by wire drawing oil during calendering and drawing treatment; the wire drawing oil is filtered by a filtering mechanism after wire drawing, calendering or drawing treatment.

[0009] In the aforementioned processing technology of corona-resistant enameled copper flat wire, the filtering mechanism comprises a sedimentation tank, a first sedimentation zone, a second sedimentation zone and a third sedimentation zone are sequentially arranged in the sedimentation tank along the flow direction of the wire drawing oil, a first filtering assembly is arranged above the third sedimentation zone, an oil outlet pipe is arranged in the third sedimentation zone, and a second filtering assembly is connected to the middle part of the oil outlet pipe; The first filtering assembly is used for continuously sucking and filtering the wire drawing oil in the third sedimentation zone, so as to remove impurities and copper powder in the wire drawing oil; The second filtering assembly is used for filtering the wire drawing oil entering the wire drawing, calendering or drawing equipment, so as to remove impurities and copper powder in the wire drawing oil.

[0010] In the aforementioned processing technology of corona-resistant enameled copper flat wire, a first channel is arranged on one side of the first sedimentation zone and communicates with the second sedimentation zone, the first channel is located at the bottom of the sedimentation tank, a second channel is arranged on one side of the second sedimentation zone and communicates with the third sedimentation zone, and the second channel is located at the top of the sedimentation tank.

[0011] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the first filtering assembly comprises a filtering box body located above the third precipitation zone, the bottom of the filtering box body is provided with a liquid outlet communicating with the third precipitation zone, the middle of the filtering box body forms a filtering cavity, the first filtering layer is arranged in the filtering cavity, the two ends of the first filtering layer are respectively connected with the cloth feeding roller and the cloth collecting roller, a spraying pipe and a liquid level sensor are respectively arranged above the first filtering layer and located in the filtering cavity, the end of the spraying pipe extends into the third precipitation zone, and a pressing assembly connected with the filtering box body is arranged on the two sides of the first filtering layer; the pressing assembly comprises a lower pressing plate located below the first filtering layer and an upper pressing plate located above the first filtering layer, the two sides of the upper pressing plate are slidably connected with the filtering box body through guide rods, and the middle of the upper pressing plate is connected with the filtering box body through an extension rod.

[0012] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the two sides of the lower pressing plate along the moving direction of the first filtering layer are provided with driven rollers rotatably connected with the filtering box body, the driven rollers are located above the cloth feeding roller and the cloth collecting roller in the height direction, and a rotary encoder is connected with the outside of any driven roller.

[0013] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the cloth feeding roller and the cloth collecting roller are both rotatably connected with the filtering box body, and the outside of the cloth feeding roller and the cloth collecting roller is respectively connected with two driving motors.

[0014] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the two sides of the filtering box body are connected with the cloth feeding roller and the cloth collecting roller through U-shaped grooves, and the driving motor is connected with the cloth feeding roller or the cloth collecting roller through a connecting flange.

[0015] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the connecting flange comprises two flange plates in a split type, the two flange plates are connected with each other through bolts, one flange plate is driven by a driving motor, and the other flange plate is connected with the cloth feeding roller or the cloth collecting roller.

[0016] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the second filtering assembly comprises a centrifugal tank, the top of the centrifugal tank is connected with a centrifugal cover plate, the inner side of the centrifugal tank is rotatably connected with an inner cylinder body, the bottom center of the inner cylinder body is connected with a driving mechanism, the bottom periphery and the side wall of the inner cylinder body are provided with openings for the drawing oil to pass through, the inner side of the inner cylinder body is fixedly connected with a filter frame, and the second filtering layer is wrapped on the filter frame; the middle of the centrifugal cover plate is connected with an oil outlet pipe through a flexible oil conveying pipe, and the bottom of the centrifugal tank is connected with the oil outlet pipe through an oil discharge pipe.

[0017] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein the oil outlet pipe comprises a first oil outlet pipe and a second oil outlet pipe, two ends of the first oil outlet pipe are respectively connected to the third sedimentation zone and the flexible oil conveying pipe, and an end of the second oil outlet pipe is connected to the oil discharge pipe; a flow sensor is connected to the second oil outlet pipe; the first oil outlet pipe and the second oil outlet pipe are connected to each other through a connecting pipe; the first oil outlet pipe, the flexible oil conveying pipe and the connecting pipe are connected to each other through an electric three-way valve; and the oil discharge pipe and the connecting pipe are both connected to an electric ball valve.

[0018] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein the filter frame comprises two annular plates arranged side by side in an up-down manner, the two annular plates are connected to each other through a vertical plate, a first mounting ring is connected to the annular plate at the top of the filter frame, and a second mounting ring is connected to the annular plate at the bottom of the filter frame. The second filter layer comprises a first second filter layer and a second second filter layer, the first second filter layer is a long-strip-shaped filter cloth which is sleeved on the outer walls of the two annular plates and connected end to end, and the second second filter layer is a circular filter cloth which is adhered to the bottom of the second mounting ring.

[0019] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein a plurality of fixing bolts are annularly distributed around the top of the inner cylinder body, a circular hole matched with the fixing bolts is arranged on the first mounting ring, and the upper ends of the fixing bolts pass through the circular hole and are connected to fixing nuts.

[0020] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein the driving mechanism is a belt driving mechanism, one end of the belt driving mechanism is fixedly connected to the bottom of the inner cylinder body through a belt pulley, and the other end of the belt driving mechanism extends to the outside of the centrifugal tank and is connected to a centrifugal motor.

[0021] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein the surface of the B copper wire is cleaned in step ③ through a cleaning mechanism, the cleaning mechanism comprises a cleaning pool, a cleaning chamber and a filtering chamber are formed in the cleaning pool respectively, the cleaning chamber and the filtering chamber are separated from each other through a filter screen, a first guide wheel is arranged outside the cleaning chamber, a second guide wheel is arranged in the cleaning pool, the first guide wheel and the second guide wheel are distributed in a high-low staggered manner, the cleaning chamber and the filtering chamber are connected to each other through a reflux pipe, and a circulating pump is connected to the reflux pipe.

[0022] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein the filter screen comprises a metal frame, the metal frame is inserted into the cleaning pool at both sides, and a non-woven fabric filter layer is arranged on the metal frame.

[0023] The processing technology of the foregoing corona-resistant enameled copper flat wire, wherein a cleaning cover plate is connected to the top of the cleaning pool, and openings for the B copper wire to pass through are arranged at both sides of the cleaning cover plate.

[0024] The first guide wheel and the second guide wheel are symmetrically arranged on the two sides of the cleaning tank along the running direction of the B copper wire, the inner side of the first guide wheel and the second guide wheel is rotationally connected with a mounting shaft, and the mounting shaft is detachably connected to the side wall of the cleaning tank through a mounting frame.

[0025] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the D copper wire is painted by a painting machine in step 5, an air wire drawing mechanism is mounted on the side wall of the painting machine, the air wire drawing mechanism comprises an air inlet cylinder, a wire running portion is fixedly connected in the air inlet cylinder on one side of the air inlet cavity, a wire running hole is formed in the middle of the wire running portion for matching the enameled wire, an outlet tube is connected to the air inlet cylinder on the other side of the air inlet cavity, an air inlet pipe is connected to the side wall of the air inlet cylinder, one end of the air inlet pipe communicates with the air inlet cavity, and the other end of the air inlet pipe is connected with an air pump.

[0026] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the wire running hole is conical in shape, and the inner diameter of the wire running hole gradually decreases towards the air inlet cavity.

[0027] In the processing technology of the foregoing corona-resistant enameled copper flat wire, one side of the wire running portion is provided with a limiting portion fixedly connected in the air inlet cylinder, and the other side of the wire running portion is provided with a cover plate fixedly connected to the air inlet cylinder and used for extruding and limiting the wire running portion.

[0028] In the processing technology of the foregoing corona-resistant enameled copper flat wire, the limiting portion is cylindrical in shape, and the limiting portion and the air inlet cylinder are nested and mutually fitted, the two ends of the limiting portion are mutually fitted with the air inlet cylinder and the wire running portion respectively, and the side wall of the limiting portion is provided with an opening matched with the outlet tube.

[0029] Compared with the prior art, the present application has the following characteristics: (1) The present application can remove the wire drawing oil and copper powder attached to the surface of the C copper wire before annealing treatment, thereby improving the stability of the copper flat wire core during subsequent painting and ensuring the coating stability of the paint film on the surface of the enameled wire. (2) The surface of the C copper wire after cleaning will still be attached with a certain amount of cleaning liquid, which will evaporate and form water vapor when the copper flat wire core enters the annealing furnace, thereby wrapping the surface of the C copper wire with water vapor, reducing the possibility of oxidation caused by mutual contact with oxygen in the furnace during the annealing process, and further improving the adhesion stability of the subsequent paint film on the surface of the C copper wire. (3) Through the structural limitation of the filtering mechanism, the wire drawing oil can be first filtered by the first and second sedimentation zones after entering the sedimentation tank, so that the copper powder and impurities with large mass in the wire drawing oil can be settled at the bottom of the first and second sedimentation zones, thereby reducing the copper powder content of the wire drawing oil when entering the third sedimentation zone; after the wire drawing oil enters the third sedimentation zone, the first filtering assembly can continuously suck and secondarily filter the wire drawing oil, thereby further reducing the copper powder content in the wire drawing oil; after the wire drawing oil is drawn out through the oil outlet pipe, the second filtering assembly can also thirdly filter the wire drawing oil, thereby greatly reducing the copper powder adhesion amount of the copper wire when entering the cleaning mechanism, and ensuring the filtering efficiency of the wire drawing oil in the circulating filtering process, preventing the normal circulation and lubrication of the wire drawing oil from being affected by the filtering process; (4) Through the structural limitation of the first filtering assembly, the two side edges of the first filter layer can be tightly pressed and limited after the first filter layer is moved into position, thereby ensuring the structural stability of the first filter layer at the filtering position and preventing deformation and leakage of the first filter layer when the wire drawing oil accumulates excessively; when the adhesion amount of copper powder on the surface of the first filter layer reaches a threshold value, the wire drawing oil cannot penetrate quickly and accumulates at the middle position of the first filter layer due to the obstruction of copper powder; at this time, the liquid level of the accumulated wire drawing oil can be detected by the liquid level sensor, and the control of the rotating of the cloth feeding roller and the cloth collecting roller is realized after the threshold value is reached, that is, the automatic replacement of the filter cloth is realized; On the basis of the above, through the cooperation of the driven rollers, on the one hand, the driven rollers can limit the height of the front and back sides of the first filter layer, so that the first filter layer maintains a horizontal state in the filtering cavity and ensures its filtering effect; on the other hand, the driven rollers can also support the first filter layer, that is, the wire drawing oil on the surface of the first filter layer can concentrate at the middle position of the first filter layer after accumulation, thereby improving the detection accuracy of the liquid level sensor for the wire drawing oil; (5) Through the structural limitation of the second filtering assembly, the wire drawing oil can be quickly filtered by centrifugation before entering the processing equipment, that is, the residence time of the wire drawing oil in the inner cylinder is effectively reduced, and the wire drawing oil can uniformly pass through the four second filter layers with the rotation of the inner cylinder, thereby avoiding the possibility of excessive accumulation of copper powder at the local position of the second filter layer causing blockage; at the same time, since the wire drawing oil has passed through two filtering processes before entering the second filtering assembly, the accumulation speed of copper powder at the second filter layer can be effectively reduced, thereby greatly reducing the replacement frequency of the second filter layer by the operator and improving the practicability of the second filtering assembly; (6) And under the above cooperation, the present application can completely remove the wire drawing oil and copper powder remaining on the surface of the copper flat wire before the painting process, and alleviate the oxidation of the copper flat wire during the annealing process, thereby enabling the paint film to stably adhere to the surface of the copper flat wire after being coated, and ensuring the film forming and forming quality of the 240-grade polyimide paint; Therefore, the present application can improve the adhesion stability of the paint film on the surface of the enameled copper flat wire. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of the filtering mechanism in Example 1; Figure 2 is a structural schematic diagram of Example 2; Figure 3 is an installation schematic diagram of the connecting flange in Example 2; Figure 4 is a structural schematic diagram of Example 3; Figure 5 is an A-direction enlarged view of Figure 4 ; Figure 6 is a B-direction enlarged view of Figure 4 ; Figure 7 is a structural schematic diagram of Example 4; Figure 8 is an installation structure diagram of the first guide wheel and the second guide wheel in Example 4; Figure 9 is a structural schematic diagram of Example 5; Figure 10 is an installation schematic diagram of Example 5 on the enameling machine.

[0031] The signs in the drawings are: 1-precipitation tank, 2-oil outlet pipe, 3-filtering box body, 4-first filtering layer, 5-cloth feeding roller, 6-cloth collecting roller, 7-spraying pipe, 8-liquid level sensor, 9-pressing plate, 10-pressing plate, 11-guide rod, 12-telescopic rod, 13-driven roller, 14-flange plate, 15-centrifugal tank, 16-inner cylinder, 17-filtering frame, 18-second filtering layer, 19-second filtering layer, 20-oil discharge pipe, 21-connecting pipe, 22-fixing bolt, 23-fixing nut, 24-cleaning tank, 25-filter screen, 26-first guide wheel, 27-second guide wheel, 28-backflow pipe, 29-air inlet cylinder, 30-air inlet cavity, 31-wiring part, 32-wiring hole, 33-wire outlet pipe, 34-air inlet pipe, 35-limiting part, 36-air extraction cover plate, 37-mounting frame, 100-first filtering assembly, 200-second filtering assembly, 101-first precipitation area, 102-second precipitation area, 103-third precipitation area, 171-annular plate, 172-vertical plate, 173-first mounting ring, 174-second mounting ring, 181-second filtering layer one, 182-second filtering layer two, 201-first oil outlet pipe, 202-second oil outlet pipe, 241-cleaning chamber, 242-filtering chamber. DETAILED DESCRIPTION

[0032] The application will be further described in conjunction with the drawings and examples, but not as the basis for limiting the application.

[0033] Embodiment 1. A processing technology of a corona-resistant enameled copper flat wire, comprising the following steps: ①φ12.5mm copper round wire is subjected to wire drawing treatment to prepare φ5mm copper round wire, and A copper wire is obtained; ②φ5mm A copper wire is subjected to calendering and drawing treatment in sequence to prepare copper flat wire, and B copper wire is obtained; ③the surface of B copper wire is cleaned by a cleaning mechanism to remove residual wire drawing oil and copper powder on the surface of B copper wire, and the surface of copper wire is attached with cleaning liquid after cleaning, the cleaning liquid is specifically deionized water, and C copper wire is obtained; ④C copper wire is subjected to annealing treatment by an annealing furnace, and the cleaning liquid on the surface of C copper wire evaporates into water vapor and wraps C copper wire in the annealing process, so as to relieve oxidation of C copper wire in the annealing process, and D copper wire is obtained; ⑤the surface of D copper wire is coated with a primer layer and a topcoat layer in sequence by an enameling machine and is cured, the primer layer is coated by 240-grade polyimide paint, and the topcoat layer is coated by corona-resistant polyimide paint, and finished enameled wire is obtained.

[0034] In the step ①, the copper round wire is lubricated by wire drawing oil during wire drawing treatment, and the A copper wire is lubricated by wire drawing oil during calendering and drawing treatment in the step ②; the wire drawing oil is filtered by a filtering mechanism after wire drawing, calendering or drawing treatment.

[0035] The filtering mechanism is composed as shown in Figure 1 The filtering mechanism is composed as shown in The first filtering assembly 100 is used for continuously sucking and filtering the wire drawing oil in the third sedimentation zone 103, so as to remove impurities and copper powder in the wire drawing oil; The second filtering assembly 200 is used for filtering the wire drawing oil entering the wire drawing, calendering or drawing equipment, so as to remove impurities and copper powder in the wire drawing oil.

[0036] The first sedimentation area 101 is provided with a first channel communicating with the second sedimentation area 102, and the first channel is located at the bottom of the sedimentation tank 1. The second sedimentation area 102 is provided with a second channel communicating with the third sedimentation area 103, and the second channel is located at the top of the sedimentation tank 1.

[0037] The first sedimentation area 101 is provided with a first channel communicating with the second sedimentation area 102, and the first channel is located at the bottom of the sedimentation tank 1. The second sedimentation area 102 is provided with a second channel communicating with the third sedimentation area 103, and the second channel is located at the top of the sedimentation tank 1.

[0038] The first sedimentation area 101 is provided with a first channel communicating with the second sedimentation area 102, and the first channel is located at the bottom of the sedimentation tank 1. The second sedimentation area 102 is provided with a second channel communicating with the third sedimentation area 103, and the second channel is located at the top of the sedimentation tank 1.

[0039] The first sedimentation area 101 is provided with a first channel communicating with the second sedimentation area 102, and the first channel is located at the bottom of the sedimentation tank 1. The second sedimentation area 102 is provided with a second channel communicating with the third sedimentation area 103, and the second channel is located at the top of the sedimentation tank 1.

[0040] The first sedimentation area 101 is provided with a first channel communicating with the second sedimentation area 102, and the first channel is located at the bottom of the sedimentation tank 1. The second sedimentation area 102 is provided with a second channel communicating with the third sedimentation area 103, and the second channel is located at the top of the sedimentation tank 1.

[0041] The first sedimentation area 101 is provided with a first channel communicating with the second sedimentation area 102, and the first channel is located at the bottom of the sedimentation tank 1. The second sedimentation area 102 is provided with a second channel communicating with the third sedimentation area 103, and the second channel is located at the top of the sedimentation tank 1.

[0042] Embodiment 2. The first filter assembly is constituted as shown in Figures 2-3As shown, the first filter assembly is used for continuous pumping and filtering of the drawing oil standing in the third sedimentation area 103 in Example 1, so as to remove impurities and copper powder in the drawing oil; specifically comprising a filter box 3 located above the third sedimentation area 103, the bottom of the filter box 3 is fixed by a section steel above the third sedimentation area 103 and is in an up-down separated state with the third sedimentation area 103, the bottom of the filter box 3 is provided with a liquid outlet communicating with the third sedimentation area 103, the middle of the filter box 3 forms a filter cavity, and the filter cavity is provided with a first filter layer 4, the first filter layer 4 can be selected from non-woven fabric, and the two ends of the first filter layer 4 are respectively connected with an inlet cloth roller 5 and a cloth collecting roller 6, and the upper side of the first filter layer 4 is respectively provided with a spraying pipe 7 and a liquid level sensor 8 located in the filter cavity, the liquid level sensor 8 is a non-contact infrared liquid level sensor, the detection direction of the liquid level sensor 8 is towards the middle position of the first filter layer 4 in the filter cavity, and the end of the spraying pipe 7 extends into the third sedimentation area 103, the middle of the spraying pipe 7 is connected with a water pump, and the two sides of the first filter layer 4 are provided with a pressing assembly connected with the filter box 3; the pressing assembly comprises a lower pressing plate 9 located below the first filter layer 4 and an upper pressing plate 10 located above the first filter layer 4, the two sides of the upper pressing plate 10 are slidingly connected with the filter box 3 through guide rods 11, and the middle of the upper pressing plate 10 is connected with the filter box 3 through an extension rod 12, and the extension rod 12 can be selected from an electric push rod.

[0043] The lower pressing plate 9 is provided with driven rollers 13 rotatingly connected with the filter box 3 on the front and back sides along the moving direction of the first filter layer 4, the driven rollers 13 are located above the inlet cloth roller 5 and the cloth collecting roller 6 along the height direction, so that the first filter layer 4 is guided by the driven rollers 13 and horizontally passes through the filter box 3, and the outside of any driven roller 13 is connected with a rotary encoder.

[0044] Tension sensors can be installed at the two ends of the driven rollers 13 as needed, so as to detect the tension of the first filter layer 4 by the tension sensors, and when the tension reaches a threshold value, the inlet cloth roller 5 is controlled to continue rotating until the tension is lower than the threshold value after the cloth collecting roller 6 stops working, so as to prevent the first filter layer 4 from being excessively tightened due to different amounts of cloth entering and collecting by the inlet cloth roller 5 and the cloth collecting roller 6.

[0045] The inlet cloth roller 5 and the cloth collecting roller 6 are both rotatingly connected with the filter box 3, and the outside of the inlet cloth roller 5 and the cloth collecting roller 6 is respectively connected with two drive motors.

[0046] The two sides of the filter box 3 are connected with the inlet cloth roller 5 and the cloth collecting roller 6 through U-shaped grooves, the inlet cloth roller 5 and the cloth collecting roller 6 are placed on the U-shaped grooves through rolling bearings, and the drive motors are connected with the inlet cloth roller 5 or the cloth collecting roller 6 through connecting flanges.

[0047] The connecting flange comprises two flange plates 14 which are connected to each other by bolts, one of which is sleeved on the motor shaft of the driving motor and is keyed to the motor shaft, and the other of which is sleeved on the entry roller 5 or the take-up roller 6 and is keyed to the entry roller 5 or the take-up roller 6.

[0048] In this embodiment, the structure of the first filter assembly is limited based on that of the embodiment 1, so that the first filter assembly can be used to extract the wire drawing oil in the third sedimentation zone 103 by the spray pipe 7 and spray the wire drawing oil from above the first filter layer 4, so that the wire drawing oil can flow vertically downward through the first filter layer 4 and return to the third sedimentation zone 103 after being sprayed, thereby realizing the circulation filtration of the wire drawing oil in the third sedimentation zone 103. Since this filtration process only extracts and filters part of the wire drawing oil in the third sedimentation zone 103, the filtration process will not affect the normal circulation of the wire drawing oil, i.e., when the first filter assembly is stopped for maintenance or the first filter layer 4 is replaced, the wire drawing oil can still flow in a conventional manner.

[0049] In the filtration process, the telescopic rod 12 is in the extended state and controls the upper pressing plate 10 to clamp the two side edges of the first filter layer 4, so as to prevent the first filter layer 4 from tilting and discharging after the wire drawing oil accumulates. When the amount of copper powder on the surface of the first filter layer 4 reaches a threshold value, the wire drawing oil cannot quickly penetrate the first filter layer 4, and the wire drawing oil will accumulate at the middle position of the first filter layer 4 and cause the first filter layer 4 to sag at the accumulation position, so that a certain liquid level height of the wire drawing oil is formed at this position. At this time, the liquid level sensor 8 can detect the liquid level height of the wire drawing oil at this position, and when the liquid level height reaches a threshold value, the telescopic rod 12 is controlled to lift the upper pressing plate 10 to release the pressing and limiting of the first filter layer 4, and then the entry roller 5 and the take-up roller 6 are simultaneously rotated to replace the first filter layer 4, thereby realizing the automatic replacement function of the first filter layer 4.

[0050] When the first filter layer 4 is moving, the movement length of the first filter layer 4 can be detected by the cooperation of the rotary encoder and the driven roller 13, and the device is controlled to stop conveying when the first filter layer 4 is moved into position, so that the length of the first filter layer 4 remains consistent during each replacement.

[0051] Embodiment 3. The second filter assembly, which is constituted as Figures 4-6As shown, the second filter assembly is used for filtering the drawing oil entering the drawing, calendering or drawing equipment in Example 1, so as to remove impurities and copper powder in the drawing oil; specifically comprising a centrifugal tank 15, a centrifugal cover plate is connected to the top of the centrifugal tank 15, an inner cylinder 16 is rotatably connected to the inner side of the centrifugal tank 15, a driving mechanism is connected to the bottom center of the inner cylinder 16, openings for the drawing oil to pass through are arranged on the bottom periphery and the side wall of the inner cylinder 16, a filter frame 17 is fixedly connected to the inner side of the inner cylinder 16, and a second filter layer 18 is wrapped on the filter frame 17; a flexible oil conveying pipe 19 is connected to the centrifugal cover plate, and an oil outlet pipe 2 is connected to the bottom of the centrifugal tank 15 through an oil discharge pipe 20.

[0052] The oil outlet pipe 2 comprises a first oil outlet pipe 201 and a second oil outlet pipe 202, two ends of the first oil outlet pipe 201 are respectively connected to the third sedimentation zone 103 and the flexible oil conveying pipe 19, one end of the second oil outlet pipe 202 is connected to the oil discharge pipe 20, and the other end of the second oil outlet pipe 202 is connected to the drawing, calendering or drawing equipment.

[0053] Oil pumps are connected to the first oil outlet pipe 201 and the second oil outlet pipe 202, the drawing oil is drawn into the centrifugal tank 15 through the cooperation of the oil pumps and the first oil outlet pipe 201, and the filtered drawing oil is drawn into the drawing, calendering or drawing equipment through the cooperation of the oil pumps and the second oil outlet pipe 202.

[0054] A flow sensor is connected to the second oil outlet pipe 202, the first oil outlet pipe 201 and the second oil outlet pipe 202 are connected to each other through a connecting pipe 21, the first oil outlet pipe 201, the flexible oil conveying pipe 19 and the connecting pipe 21 are connected to each other through an electric three-way valve, and electric ball valves are connected to the oil discharge pipe 20 and the connecting pipe 21.

[0055] The flow sensor is used to detect the flow of the drawing oil in the second oil outlet pipe 202, if the flow is lower than a threshold value, it means that the copper powder attached to the second filter layer 18 is too much to cause blockage, which affects the normal discharge of the drawing oil; then an operator controls the electric three-way valve to switch the flow direction of the drawing oil, so that the drawing oil enters the second oil outlet pipe 202 through the connecting pipe 21, and then the second filter layer 18 in the centrifugal tank 15 is replaced.

[0056] The filter frame 17 comprises two annular plates 171 arranged side by side in an up-down manner, the two annular plates 171 are connected to each other through a vertical plate 172, a first mounting ring 173 is connected to the annular plate 171 at the top of the filter frame 17, and a second mounting ring 174 is connected to the annular plate 171 at the bottom of the filter frame 17; the annular plate 171, the vertical plate 172, the first mounting ring 173 and the second mounting ring 174 are welded together.

[0057] The second filter layer 18 comprises a second filter layer one 181 and a second filter layer two 182. The second filter layer one 181 is a long strip-shaped filter cloth, which is arranged on the outer wall of the two annular plates 171 and connected by long leg staples. The second filter layer two 182 is a circular filter cloth, which is adhered to the bottom of the second mounting ring 174.

[0058] A plurality of fixing bolts 22 are annularly distributed around the top of the inner cylinder body 16. The first mounting ring 173 is provided with a circular hole matched with the fixing bolts 22. The upper end of the fixing bolt 22 penetrates through the circular hole and is connected with a fixing nut 23. The fixing nut 23 can be a cover nut. After being screwed, the fixing nut 23 can also extrude and limit the filter frame 17, so that the second filter layer two 182 is completely attached to the inner cylinder body 16 and the second mounting ring 174 under the extrusion, thereby avoiding the leakage of the drawing oil from the connecting gap of the second filter layer two 182.

[0059] The driving mechanism is a belt transmission mechanism. One end of the belt transmission mechanism is fixedly connected to the bottom of the inner cylinder body 16 through a belt pulley. The other end of the belt transmission mechanism extends to the outside of the centrifugal tank 15 and is connected with a centrifugal motor. The centrifugal motor is fixed on the outer wall of the centrifugal tank 15. A protective cover is arranged at the connection between the belt transmission mechanism and the centrifugal motor for sealing. The centrifugal motor is shielded at the connection by the protective cover, thereby preventing the drawing oil from flowing out of the centrifugal tank 15 from the connecting gap.

[0060] In this embodiment, based on the embodiment 1, the structure of the second filter assembly is limited, so that the drawing oil can be centrifugally filtered by the second filter assembly before entering the drawing, calendering or drawing equipment. On the one hand, the drawing oil is completely filtered before lubrication, thereby avoiding the re-contact of the copper powder in the drawing oil with the copper wire. On the other hand, the centrifugal filtration can realize the rapid filtration and discharge of the drawing oil, thereby preventing the reduction of the drawing oil delivery caused by the reduction of the permeability of the second filter layer 18, and ensuring the circulation stability of the drawing oil.

[0061] In use, the drawing oil is extracted through the first oil outlet pipe 201 and then delivered to the inner cylinder body 16 through the flexible oil delivery pipe 19. At the same time, the inner cylinder body 16 is driven by the driving mechanism to rotate at high speed, so that the drawing oil flows through the second filter layer 18 around the filter frame 17 under the rotating action and rapidly flows into the bottom of the centrifugal tank 15. The copper powder in the drawing oil is intercepted in the second filter layer 18, thereby realizing the filtering function.

[0062] When the second filter layer 18 needs to be replaced, the operator can first control the electric three-way valve to switch the flow direction of the drawing oil, so that the drawing oil, after being extracted, flows directly into the second oil outlet pipe 202 through the first oil outlet pipe 201 and the connecting pipe 21. Then, after opening the centrifuge cover, unscrew the fixing nut 23 to release the fixation of the filter frame 17, and then remove the filter frame 17 entirely from the inner cylinder 16 and replace the second filter layer 18 covering its surface. In addition, the manufacturer can also process two filter frames 17 as needed, and when replacing the second filter layer 18, the filter frame 17 covered with the clean second filter layer 18 can be directly replaced on the filter frame 17 with copper powder adhering to it inside the inner cylinder 16, thereby improving the replacement efficiency of the operator.

[0063] Example 4. Cleaning mechanism, configured as follows: Figures 7-8 As shown, the cleaning mechanism is used to clean the surface of copper wire B in Example 1. Specifically, it includes a cleaning tank 24, in which a cleaning chamber 241 and a filter chamber 242 are formed. The cleaning chamber 241 and the filter chamber 242 are separated from each other by a filter screen 25. A first guide wheel 26 is provided on the outside of the cleaning chamber 241, and a second guide wheel 27 is provided inside the cleaning tank 24. The first guide wheel 26 and the second guide wheel 27 are staggered in height. The outside of the cleaning chamber 241 and the filter chamber 242 are connected to each other by a return pipe 28. A circulation pump is connected to the return pipe 28. The circulation pump is used to pump the cleaning liquid in the cleaning chamber 241 into the filter chamber 242 through the return pipe 28, so that the cleaning liquid can circulate along the cleaning chamber 241, the return pipe 28 and the filter chamber 242.

[0064] The filter 25 includes a metal frame, with both sides of the metal frame inserted into the washing tank 24, and a non-woven filter layer is provided on the metal frame.

[0065] The cleaning tank 24 has C-shaped slots on both side walls and bottom surface that fit the metal frame. The inner end of the C-shaped slot is provided with a sealing strip. After the filter screen 25 is inserted, it is in close contact with the cleaning tank 24 through the sealing strip and forms a seal, so as to prevent copper powder and wire drawing oil in the filter chamber 242 from seeping into the cleaning chamber 241 from the installation gap of the filter screen 25.

[0066] The top of the cleaning tank 24 is connected to a cleaning cover plate, and the cleaning cover plate has openings on both sides for the B copper wire to pass through.

[0067] The first guide wheel 26 and the second guide wheel 27 are symmetrically arranged on the front and rear sides of the cleaning tank 24 along the routing direction of the copper wire B. The inner sides of the first guide wheel 26 and the second guide wheel 27 are rotatably connected to the mounting shaft, which is detachably connected to the side wall of the cleaning tank 24 via the mounting bracket.

[0068] The B copper wire can be guided by the cooperation of the first guide wheel 26 and the second guide wheel 27, so that the B copper wire is stably immersed into the cleaning liquid in the cleaning chamber 241 during the wiring process, and the cleaning effect is ensured. The cleaning liquid is specifically ionized water.

[0069] In this embodiment, the copper powder and the drawing oil on the copper wire can flow into the filtering chamber 242 after being cleaned, and cannot flow back to the cleaning chamber 241 due to the interception of the filter screen 25, so that the cleanliness of the cleaning liquid in the cleaning chamber 241 is ensured, and the cleaning effect on the copper wire is improved. On this basis, the operator can clean the filtering chamber 242 and the filter screen 25 regularly to prevent the copper powder on the surface of the filter screen 25 from affecting the permeability due to excessive adhesion.

[0070] When the copper wire passes through the cleaning pool 24, a certain amount of cleaning liquid will adhere to the surface of the copper wire. The cleaning liquid will enter the annealing furnace together with the copper wire and evaporate into water vapor under the action of high temperature in the annealing furnace. Thus, the copper wire is blocked by the water vapor, the possibility of oxidation of the copper wire caused by contact with external air is reduced, and the annealing quality of the copper wire is improved.

[0071] Embodiment 5. An air wire drawing mechanism, as shown in Figures 9-10 The air wire drawing mechanism is installed on the outer wall of the enameled wire machine in embodiment 1 and is used for drawing the enameled wire. Specifically, the air wire drawing mechanism includes an air inlet cylinder 29, a middle part of the air inlet cylinder 29 forms an air inlet cavity 30, a walking part 31 is fixedly connected in the air inlet cylinder 29 on one side of the air inlet cavity 30, a middle part of the walking part 31 forms a wire walking hole 32 matched with the enameled wire, an air outlet pipe 33 is connected to the air inlet cylinder 29 on the other side of the air inlet cavity 30, an air inlet pipe 34 is connected to the side wall of the air inlet cylinder 29, one end of the air inlet pipe 34 communicates with the air inlet cavity 30, a ball valve is connected to the middle part of the air inlet pipe 34, and the other end of the air inlet pipe 34 is connected to a gas pump.

[0072] The wire walking hole 32 is conical in shape, and the inner diameter of the wire walking hole 32 gradually decreases towards the air inlet cavity 30.

[0073] One side of the walking part 31 is provided with a limiting part 35 fixedly connected in the air inlet cylinder 29, the other side of the walking part 31 is provided with an air extraction cover plate 36, the air extraction cover plate 36 is buckled or threadedly connected to the air inlet cylinder 29 and is used for extruding and limiting the walking part 31, and a wire inlet pipe matched with the enameled wire is connected to the middle part of the air extraction cover plate 36.

[0074] The limiting part 35 is cylindrical in shape, and the limiting part 35 and the air inlet cylinder 29 are arranged in an inner-outer nested manner and are mutually fitted, the two ends of the limiting part 35 are mutually fitted with the air inlet cylinder 29 and the walking part 31 respectively, and the middle part of the side wall of the limiting part 35 is provided with an opening matched with the air outlet pipe 33.

[0075] The end of the limiting part 35 and the air inlet cylinder 29 are provided with a rubber pad.

[0076] Further, an L-shaped mounting bracket 37 is provided, one end of the mounting bracket 37 is fixedly connected with the enameled frame, the other end of the mounting bracket 37 forms a mounting part, and the outgoing wire tube 33 is bound on the mounting part by a strap.

[0077] In the processing of the enameled wire in the processing technology of the embodiment 1, there may be a situation that the enameled wire film quality has defects due to the fact that the previous process is not in place, at this time, the operator needs to cut off the wire with quality defects on the production line and extract it.

[0078] On this basis, the embodiment limits the structure of the air wire extraction mechanism, so that when the operator extracts the wire, one end of the enameled wire to be extracted can be extended out of the wire hole 32 and sequentially pass through the air inlet cavity 30 and the outgoing wire tube 33, and then the air pump is opened to make the air enter the air inlet cavity 30 from the air inlet tube 34 and be discharged outward through the outgoing wire tube 33. Thus, the air will drive the enameled wire to be extracted outward during the flow process, realizing the wire extraction function.

Claims

1. A process for processing corona resistant enameled copper flat wire, characterized by, The method comprises the following steps:

1. A copper round wire with a diameter of 12.5 mm is drawn to produce a copper round wire with a diameter of 5 mm, and A copper wire is obtained; 2. The A copper wire with a diameter of 5 mm is successively subjected to calendering and drawing to produce a copper flat wire, and B copper wire is obtained; 3. The surface of the B copper wire is cleaned to remove the drawing oil and copper powder remaining on the surface of the B copper wire, and the cleaning liquid is attached to the surface of the copper wire after cleaning, and C copper wire is obtained; 4. The C copper wire is annealed, and the cleaning liquid on the surface of the C copper wire evaporates into water vapor during the annealing process and wraps the C copper wire, thereby relieving the oxidation of the C copper wire during the annealing process, and D copper wire is obtained; 5. The surface of the D copper wire is successively coated with a primer layer and a topcoat layer, wherein the primer layer is coated with a 240-grade polyimide paint, and the topcoat layer is coated with a corona-resistant polyimide paint, and a finished enameled wire is obtained.

2. The processing technology of corona-resistant enameled copper flat wire according to claim 1, characterized in that: In the step 1, the copper round wire is lubricated by drawing oil during the drawing process, and the A copper wire is lubricated by drawing oil during the calendering and drawing process in the step 2; the drawing oil is filtered by a filtering mechanism after the drawing, calendering or drawing process.

3. The processing method of corona-resistant enameled copper flat wire according to claim 2, characterized in that: The filtering mechanism comprises a sedimentation tank (1), and the sedimentation tank (1) is provided with a first sedimentation zone (101), a second sedimentation zone (102) and a third sedimentation zone (103) in sequence along the flow direction of the drawing oil; the upper side of the third sedimentation zone (103) is provided with a first filtering assembly; the third sedimentation zone (103) is provided with an oil outlet pipe (2); and the middle part of the oil outlet pipe (2) is connected with a second filtering assembly. The first filtering assembly is used for continuously pumping and filtering the drawing oil in the third sedimentation zone (103), so as to remove the impurities and copper powder in the drawing oil. The second filtering assembly is used for filtering the drawing oil entering the drawing, calendering or drawing equipment, so as to remove the impurities and copper powder in the drawing oil.

4. The processing method of corona-resistant enameled copper flat wire according to claim 3, characterized in that: The first filtering assembly comprises a filtering box (3) located above the third sedimentation zone (103); the bottom of the filtering box (3) is provided with a liquid outlet communicating with the third sedimentation zone (103); the middle part of the filtering box (3) forms a filtering cavity; the filtering cavity is provided with a first filter layer (4); the two ends of the first filter layer (4) are respectively connected with an inlet roller (5) and a take-up roller (6); the upper side of the first filter layer (4) is respectively provided with a spray pipe (7) and a liquid level sensor (8) located in the filtering cavity; the end of the spray pipe (7) extends into the third sedimentation zone (103); and the two sides of the first filter layer (4) are provided with a pressing assembly connected with the filtering box (3); the pressing assembly comprises a lower pressing plate (9) located below the first filter layer (4) and an upper pressing plate (10) located above the first filter layer (4); the two sides of the upper pressing plate (10) are slidably connected with the filtering box (3) through guide rods (11); and the middle part of the upper pressing plate (10) is connected with the filtering box (3) through an extension rod (12).

5. The process for processing corona resistant enamelled flat copper conductor as claimed in claim 4 wherein the process is characterized by: The lower pressing plate (9) is provided with a driven roller (13) rotatably connected with the filtering box (3) on the front and back sides along the moving direction of the first filter layer (4); the driven roller (13) is located above the inlet roller (5) and the take-up roller (6) along the height direction; and the outer part of any driven roller (13) is connected with a rotary encoder.

6. The process for processing corona resistant enamelled flat copper conductor as claimed in claim 3 wherein the process is characterized by: The second filtering assembly comprises a centrifugal tank (15), a centrifugal cover plate connected to the top of the centrifugal tank (15), an inner cylinder (16) rotatably connected to the inner side of the centrifugal tank (15), a driving mechanism connected to the bottom center of the inner cylinder (16), openings provided on the bottom periphery and the sidewall of the inner cylinder (16) for the passage of wire drawing oil, a filtering frame (17) fixedly connected to the inner side of the inner cylinder (16), and a second filtering layer (18) wrapped on the filtering frame (17); the middle part of the centrifugal cover plate is connected to an oil outlet pipe (2) through a flexible oil conveying pipe (19), and the bottom of the centrifugal tank (15) is connected to the oil outlet pipe (2) through an oil discharge pipe (20).

7. The process for processing corona resistant enamelled flat copper conductor wire according to claim 6, characterized in that: The oil outlet pipe (2) comprises a first oil outlet pipe (201) and a second oil outlet pipe (202), the two ends of the first oil outlet pipe (201) are respectively connected to the third sedimentation zone (103) and the flexible oil conveying pipe (19), and the end of the second oil outlet pipe (202) is connected to the oil discharge pipe (20); a flow sensor is connected to the second oil outlet pipe (202), the first oil outlet pipe (201) and the second oil outlet pipe (202) are connected to each other through a connecting pipe (21), the first oil outlet pipe (201), the flexible oil conveying pipe (19) and the connecting pipe (21) are connected to each other through an electric three-way valve, and the oil discharge pipe (20) and the connecting pipe (21) are both connected to an electric ball valve.

8. The process for processing corona resistant enamelled flat copper conductor as claimed in claim 6 wherein the process is characterized by: The filtering frame (17) comprises two annular plates (171) arranged side by side in an up-down manner, the two annular plates (171) are connected to each other through a vertical plate (172), a first mounting ring (173) is connected to the annular plate (171) at the top of the filtering frame (17), and a second mounting ring (174) is connected to the annular plate (171) at the bottom of the filtering frame (17). The second filtering layer (18) comprises a second filtering layer one (181) and a second filtering layer two (182), the second filtering layer one (181) is a long strip-shaped filter cloth wrapped on the outer walls of the two annular plates (171) and connected end to end, and the second filtering layer two (182) is a circular filter cloth and is adhered to the bottom of the second mounting ring (174).

9. The process for processing corona resistant enamelled flat copper conductor wire according to claim 8, characterized in that: A plurality of fixing bolts (22) are annularly distributed around the top of the inner cylinder (16), a circular hole matched with the fixing bolts (22) is arranged on the first mounting ring (173), and the upper ends of the fixing bolts (22) pass through the circular hole and are connected to fixing nuts (23).

10. The process for processing corona resistant enamelled flat copper conductor as claimed in claim 1 wherein the process is characterized by: In step ③, the surface of the B copper wire is cleaned by a cleaning mechanism, the cleaning mechanism comprises a cleaning pool (24), a cleaning chamber (241) and a filtering chamber (242) are respectively formed in the cleaning pool (24), the cleaning chamber (241) and the filtering chamber (242) are separated from each other through a filter screen (25), a first guide wheel (26) is arranged outside the cleaning chamber (241), a second guide wheel (27) is arranged in the cleaning pool (24), the first guide wheel (26) and the second guide wheel (27) are distributed in a high-low staggered manner, the outside of the cleaning chamber (241) and the filtering chamber (242) are connected to each other through a backflow pipe (28), and a circulating pump is connected to the backflow pipe (28).

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