Insulated electric wire, method for manufacturing the same, and production apparatus

Abstract

The application provides an insulated electric wire and a preparation method and production equipment thereof. The insulated electric wire comprises a wire and an insulation layer. The wire is coated with at least one insulation layer on the outside. The eccentricity of the insulated electric wire is less than 1.30. The application solves the technical problem of uneven wire in the production process of the existing PEEK insulated conductor and achieves the technical effect of improving the flatness of the wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of insulated electric wires, in particular to an insulated electric wire and a preparation method and production equipment thereof. BACKGROUND

[0002] An electric wire with a uniform and closed layer of non-conductive material, such as resin, plastic, silicone rubber, PVC, etc., wrapped around the conductor to form an insulation layer to prevent the conductor from contacting the outside world and causing accidents such as electric leakage, short circuit, electric shock, etc., is called an insulated electric wire. The insulated electric wire with PEEK as the insulation layer has good mechanical properties and excellent properties such as radiation resistance, high temperature resistance, flame resistance, high temperature index, and good high temperature hydrolysis resistance. Currently, the production process of PEEK insulated conductors is to extrude molten PEEK insulation material onto the conductor, and then cool the PEEK material to solidify the insulation layer and tightly adhere to the inner conductor.

[0003] The existing problem is that the conductor, such as copper, is deformed in the flat hole and has different flow rates during the extrusion process, resulting in a concave center point on the wide edge of the extruded flat copper wire, which affects the size of the bare copper wire during the later production of PEEK wire. SUMMARY

[0004] The present application solves the technical problem of unevenness of the conductor in the production process of the existing PEEK insulated conductor, and achieves the technical effect of improving the flatness of the conductor.

[0005] To solve the above problems, the present application provides an insulated electric wire, comprising: a conductor; an insulation layer, at least one layer of insulation layer covering the outside of the conductor; and the eccentricity of the insulated electric wire is less than 1.30.

[0006] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the eccentricity can reflect the flatness of the insulated electric wire, the eccentricity of the insulated electric wire provided by the present application is small, the flatness is good, and the uniformity is high. The calculation method of the eccentricity is to divide the maximum thickness of the covered insulation layer by the minimum thickness.

[0007] In one example of the present application, the conductor is flat; and / or the cross section of the conductor is rectangular, and the four corners of the rectangle are r-angles; and / or the radius of any r-angle of the cross section is 0.3mm-2.0mm; and / or the raw material of the conductor is one or more of low-oxygen copper, oxygen-free copper, copper alloy, and aluminum; and / or the raw material of the insulation layer is polyether ether ketone or modified polyether ether ketone; and / or the thickness of the single-layer insulation layer is 0.08mm-0.50mm.

[0008] Compared with the prior art, the technical effects reached by the technical scheme are as follows: the raw material of the insulation layer is polyether ether ketone or modified polyether ether copper, which is a material with high mechanical strength, heat resistance, friction resistance, drug resistance, moisture resistance, etc., and can better control the uniformity and quality of the thickness of the insulation layer.

[0009] The application further provides a preparation method of the insulated wire, for preparing the insulated wire of any one of the examples, the preparation method comprising: extruding a wire into a flat shape through an extrusion die, the center of the wide side of the extrusion die being outwardly convex, the convex value of the wide side of the extrusion die being 0.02 mm-0.035 mm, to obtain a flat wire; heating the flat wire to a surface temperature of 135℃-235℃ by electromagnetic induction; melting the insulation layer material to obtain the insulation layer material in a molten state; rotating and extruding the insulation layer material in the molten state to the die head through the main screw to perform coating treatment on the heated flat wire, to obtain the insulated wire; the temperature of the coating treatment being 360℃-420℃; the wide side of the inner hole of the extrusion die being outwardly convex in an arc shape, the convex value at the center of the inner hole of the extrusion die being 0.02 mm-0.035 mm.

[0010] Compared with the prior art, the technical effects reached by the technical scheme are as follows: the hole size and shape of the extrusion die affect whether the wide side of the extruded flat wire is straight. Therefore, in the case that the width-to-thickness ratio of the wire is less than 33%, the wide side of the extrusion die needs to be outwardly convex to ensure that the wide side of the extruded flat wire is straight. The flat wire is preheated by an electromagnetic induction heater before coating, which facilitates improving the adhesion between the glue and the copper wire at the die head. Preferably, the insulation layer material needs to be baked in an oven for at least 8 hours before use to reach a completely dry state, so as to avoid causing bubbles or poor flat appearance of the product. The coating treatment is performed under the above temperature and pressure conditions, so that the insulation material has good coating effect on the flat wire.

[0011] In one example of the application, the coating treatment adopts an extrusion type extrusion die, which comprises: an inner die for limiting the flat wire, the flat wire passing through the inner hole of the inner die; an outer die sleeved with the inner die, the insulation layer material in a molten state flowing in the gap between the outer die and the inner die; wherein the length-to-width size of the inner hole of the inner die is greater than the length-to-width size of the flat wire by 0.06 mm-0.12 mm, and the inner hole size of the outer die is greater than the diameter size of the insulated wire by 0.05 mm-1.0 mm.

[0012] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the extrusion die is divided into an outer die and an inner die, the product size is mainly controlled by the outer die, and the position stability of the flat copper wire in the production process is controlled by the inner die. The inner hole size of the inner die is 0.06mm-0.12mm larger than that of the flat copper wire, which can prevent scratches of the flat copper wire on the inner hole of the inner die and prevent the flat copper wire from swinging up and down or left and right in the inner die, thereby preventing eccentricity defects. The inner hole size of the outer die is 0.05mm-1.0mm larger than the outer diameter size of the insulating wire, so as to meet the thickness requirement of the insulating layer, and the larger the thickness is, the larger the inner hole size of the outer die is. The shape of the die hole can be rectangular or irregular.

[0013] In an example of the present application, when the ratio of the narrow side to the wide side of the inner hole of the extrusion die is 0.25-0.33, the protrusion value at the center of the inner hole of the extrusion die is 0.02mm-0.03mm; wherein the narrow side length of the inner hole of the extrusion die is 1mm-3mm, the wide side length of the inner hole of the extrusion die is 5mm-6mm, and the cross-sectional area of the inner hole of the extrusion die is 10mm 2 -20mm 2 , the protrusion value at the center of the inner hole of the extrusion die is 0.02mm; when the narrow side length of the inner hole of the extrusion die is 3mm-4mm, the wide side length of the inner hole of the extrusion die is 10mm-13mm, and the cross-sectional area of the inner hole of the extrusion die is 40mm 2 -50mm 2 , the protrusion value at the center of the inner hole of the extrusion die is 0.025mm.

[0014] In an example of the present application, when the ratio of the narrow side to the wide side of the inner hole of the extrusion die is 0.13-0.24, the protrusion value at the center of the inner hole of the extrusion die is 0.03mm-0.035mm; wherein the narrow side length of the inner hole of the extrusion die is 1.3mm-2mm, the wide side length of the inner hole of the extrusion die is 7mm-20mm, and the cross-sectional area of the inner hole of the extrusion die is 9mm 2 -22mm 2 , the protrusion value at the center of the inner hole of the extrusion die is 0.03mm; when the narrow side length of the inner hole of the extrusion die is 2mm-3.5mm, the wide side length of the inner hole of the extrusion die is 10mm-15mm, and the cross-sectional area of the inner hole of the extrusion die is 15mm 2 -49mm 2 , the protrusion value at the center of the inner hole of the extrusion die is 0.035mm.

[0015] Compared with the prior art, the technical effects reached by adopting the technical scheme are: due to the deformation of the wire in the flat hole and the different flow rates, the center point of the wide edge of the extruded flat wire is concave, the wide edge of the flat wire is uneven, which affects the size of the bare copper wire in the later production of the insulated wire, so the extrusion die needs to be fully considered when being manufactured, so that the flatness of the obtained flat wire is good, and the surface is not easy to appear the inwardly concave phenomenon. Therefore, the wide edge of the extrusion die designed in the application protrudes 0.02mm-0.035mm at the center, the narrow-width ratio of the obtained wire is less than 33%, and the smaller the narrow-width ratio, the greater the value of the protrusion of the wide edge of the extrusion die.

[0016] In an example of the application, the flat wire heating is carried out under a protective gas, and the protective gas is an inert gas.

[0017] Compared with the prior art, the technical effects reached by adopting the technical scheme are: to prevent the chemical reaction between the wire and oxygen in the air during the heating process, which causes the oxidation of the surface of the wire, therefore, the flat wire is heated under an inert gas, for example, the inert gas can be nitrogen. The protective gas is filled into the flat wire heating pipe, and preferably, the gas pressure is 0.02MPa-0.10MPa, so as to prevent the surface temperature of the flat wire from being reduced and the heating effect from being affected.

[0018] In an example of the application, the preparation method further comprises: cooling treatment of the insulated wire, and the cooling treatment comprises at least one of air cooling, air cooling, water cooling or a combination of two.

[0019] Compared with the prior art, the technical effects reached by adopting the technical scheme are: the product after coating is cooled by air cooling+air cooling or water cooling, so as to reduce the surface defects or poor adhesion caused by too fast cooling when the insulation layer material is crystallized, so that the covering effect of the insulation layer on the wire is better. Preferably, the air cooling+air cooling cooling method can save the industrial production cost, and is convenient, efficient and easy to operate.

[0020] The application further provides a production device applied to the preparation method of any of the above examples, which comprises: an extrusion device for extruding the wire into a flat shape to obtain a flat wire; a wire storage device for collecting the flat wire; a preheater for heating the flat wire; an insulation layer material feeding device for placing the insulation layer raw material; a main machine arranged at the outlet end of the insulation layer material feeding device, wherein a screw rod and a heater are arranged in the main machine, the heater is used for heating the insulation layer raw material in the main machine, and the screw rod is used for pushing the melted insulation layer material in the main machine to a die head of the main machine; an extrusion type die is arranged at the die head, the insulation layer raw material in the die head is extruded to the extrusion type die, and the extrusion type die is used for coating the insulation layer material on the flat wire to obtain an insulated wire; a cooling device for cooling treatment of the insulated wire, wherein a shockproof plate and a self-checking device are arranged in the cooling device, the shockproof plate is used for preventing the insulated wire from shaking, and the self-checking device is used for visually checking the thickness of the insulation layer of the insulated wire; an online detection device arranged at the rear end of the cooling device; a conveying device arranged at the rear end of the online detection device; and a wire collecting device for collecting the insulated wire, wherein the wire collecting device is arranged at the rear end of the conveying device.

[0021] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the wire raw material is first extruded into a flat wire by the extrusion device, the wide side of the extrusion die in the extrusion device is outwardly convex at the center by 0.02mm-0.035mm, so that the extruded wire is flat. Then the wire is collected by the wire storage machine through the wire storage device, and is ready for use. The wire is heated by the preheater after being unwound from the wire storage device, the preheater is an electromagnetic induction heater, and preferably, a slide rail device is arranged below the electromagnetic induction heater to improve the position stability of the electromagnetic induction heater. Before coating, the insulation layer material loading device collects the insulation layer raw material, which enters the main machine, is heated to its melting temperature by the heating device, and is continuously heated to the coating temperature in the main machine. The inner die of the extrusion die is provided with the wire, and the molten insulation layer raw material is extruded into the inner hole of the outer die by the die head. At a certain wire speed, the insulation layer raw material realizes the coating of the wire, and the insulated wire is obtained. After the coating is completed, the insulated wire is supported by the shockproof plate placed in the cooling device, which can prevent the insulated wire from producing abnormal conditions such as appearance defects or size defects due to shaking. The shockproof plate is high-temperature resistant. The insulated wire is conveyed to the cooling device, and the self-checking device is arranged in the cooling device, preferably, the self-checking device is a plane mirror, which is used to observe the thickness of the coating of the insulated wire in the cooling tank. The color depth can be distinguished, the darker color depth is the thinner coating, and vice versa, so that the position of the outer die can be adjusted in time, which can greatly save the adjustment time and waste. After self-checking, the insulated wire enters the online detection device, which uses high voltage, laser, video and the like to detect the insulated wire product online. The detection items include the thickness of the insulation layer, the characteristic pinhole, the bad point photographing, the marking and the like, which can greatly prevent the internal winding defective products from being discovered in time, and fundamentally eliminates the output of defective products. The insulated wire then enters the conveying device, which conveys the insulated wire to the take-up device, so as to facilitate the take-up of the insulated wire. The take-up device is used for take-up, and the product winding is neat. The above production equipment can complete the production of the insulated wire through a series of assembly line operations, which greatly saves the labor cost and time cost, and has high production efficiency.

[0022] In an example of the present application, four temperature zones are arranged in the main machine, including: a first temperature zone of 280-340℃, a second temperature zone of 340-360℃, a third temperature zone of 350-380℃, and a fourth temperature zone of 350-370℃.

[0023] Compared with the prior art, the technical effects reached by adopting the technical scheme are that four temperature sections are set at the host, the first temperature section is set between 280 DEG C and 340 DEG C, the rubber material rotates with the screw before being completely melted, and the rubber material comes to the second, third and fourth sections in turn, and finally flows to the die head for coating, since the temperature for coating treatment is 360 DEG C-420 DEG C, the temperature of the rubber material when flowing to the die head is suitable for coating, and the heating mode of multiple temperature sections can ensure the performance of the rubber material. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0025] Figure 1 A flowchart of a preparation method of an insulating wire provided by an embodiment of the present application is shown in the figure.

[0026] Figure 2 A structure diagram of an extrusion die provided by an embodiment of the present application is shown in the figure.

[0027] Figure 3 A structure diagram of a cross section of an extrusion die provided by an embodiment of the present application is shown in the figure.

[0028] Figure 4 A structure diagram of a production device provided by an embodiment of the present application is shown in the figure.

[0029] Explanation of reference signs:

[0030] 10-extrusion device; 20-extrusion die; 30-wire storage device; 40-preheater; 50-insulating layer material feeding device; 60-host; 70-cooling device; 71-anti-vibration plate; 72-self-checking device; 80-online detection device; 90-conveying device; 100-winding device. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below.

[0032] Embodiment one:

[0033] The embodiment provides a preparation method of an insulating wire, referring to Figure 1 , Figure 1 A flowchart of the preparation method is shown in the figure, and the preparation method comprises the following steps.

[0034] S100: extruding a wire through an extrusion die into a flat shape to obtain a flat wire;

[0035] S200: heating the flat wire to a surface temperature of 135 DEG C-235 DEG C;

[0036] S300: melt the insulation layer raw material to obtain the insulation layer raw material in a molten state;

[0037] S400: the insulation layer raw material in the molten state flows to the die head to perform coating treatment on the heated flat conductor to obtain the insulated wire;

[0038] The temperature of the coating treatment is 360-420°C;

[0039] The wide side of the inner hole of the extrusion die is arc-shaped and protrudes outward, and the protruding value at the center of the inner hole of the extrusion die is 0.02-0.035 mm.

[0040] Specifically, the material of the conductor is oxygen-free copper. In step S100, the hole shape of the extrusion die 20 is particularly important. When the narrow-to-wide ratio of the conductor is less than 33%, the center of the wide side of the inner hole of the extrusion die 20 needs to protrude by 0.020-0.035 mm. Referring to Figure 2 , Figure 2 FIG. 4 is a structural schematic diagram of the extrusion die 20.

[0041] Specifically, referring again to Figure 3 , Figure 3 FIG. 5 is a structural schematic diagram of the cross section of the extrusion die 20. The narrow side is A, the wide side is B, and the protruding value of the wide side is 2C, that is, the two opposite wide sides of the inner hole of the extrusion die 20 are arc-shaped and protrude outward, the distance between the highest point of the protrusion and the horizontal plane at the center of the corresponding wide side is 2C, and 2C is 0.02-0.035 mm. In the case where the ratio of the narrow side to the wide side of the inner hole of the extrusion die 20 is 0.25-0.33, the protruding value at the center of the inner hole of the extrusion die 20 is 0.02-0.03 mm; wherein, in the case where the length of the narrow side of the inner hole of the extrusion die 20 is 1-3 mm, the length of the wide side of the inner hole of the extrusion die 20 is 5-6 mm, and the cross-sectional area of the inner hole of the extrusion die 20 is 10-20 mm 2 2 , the protruding value at the center of the inner hole of the extrusion die 20 is 0.02 mm; in the case where the length of the narrow side of the inner hole of the extrusion die 20 is 3-4 mm, the length of the wide side of the inner hole of the extrusion die 20 is 10-13 mm, and the cross-sectional area of the inner hole of the extrusion die 20 is 40-50 mm 2 2 , the protruding value at the center of the inner hole of the extrusion die 20 is 0.025 mm. In the case where the ratio of the narrow side to the wide side of the inner hole of the extrusion die 20 is 0.13-0.24, the protruding value at the center of the inner hole of the extrusion die 20 is 0.03-0.035 mm; wherein, in the case where the length of the narrow side of the inner hole of the extrusion die 20 is 1.3-2 mm, the length of the wide side of the inner hole of the extrusion die 20 is 7-20 mm, and the cross-sectional area of the inner hole of the extrusion die 20 is 9-22 mm 2 .​​2 In the case that the length of the narrow side of the inner hole of the extrusion die 20 is 2mm-3.5mm, the length of the wide side of the inner hole of the extrusion die 20 is 10mm-15mm, and the sectional area of the inner hole of the extrusion die 20 is 15mm 2 -49mm 2 In the case that the length of the narrow side of the inner hole of the extrusion die 20 is 2mm-3.5mm, the length of the wide side of the inner hole of the extrusion die 20 is 10mm-15mm, and the sectional area of the inner hole of the extrusion die 20 is 15mm

[0042] The wide side of the inner hole of the extrusion die 20 is protruded by 0.02mm-0.035mm at the center, the narrow-width ratio of the obtained conductor is less than 33%, and the smaller the narrow-width ratio is, the greater the protruding value of the wide side of the extrusion die 20 needs to be.

[0043] Further, the flat conductor heating is carried out under a protective gas, the protective gas is an inert gas, and the gas pressure is 0.02MPa-0.10MPa.

[0044] Further, the preparation method further comprises: cooling treatment on the insulated wire, the cooling treatment comprising at least one of air cooling, air cooling, water cooling. The thickness of the insulation layer is detected at the same time during the cooling treatment.

[0045] Further, the preparation method further comprises: optical detection on the insulated wire, detecting product size, 4000V high pressure pinhole and product surface particulate matter, the measurement accuracy of the optical detection is 0.001mm, the measurement range is 0.50mm-20.00mm, and the CPK value is calculated in real time, and the alarm and photographing are carried out in time when the standard is exceeded.

[0046] Further, the coating treatment adopts an extrusion type extrusion die, the extrusion type extrusion die comprises: an inner die for limiting the flat conductor, the flat conductor passing through the inner hole of the inner die; an outer die sleeved with the inner die, the molten insulation layer material flowing in the outer die; wherein the length and width dimensions of the inner hole of the inner die are greater than the length and width dimensions of the flat conductor by 0.06mm-0.12mm, and the inner hole dimension of the outer die is greater than the diameter dimension of the insulated wire by 0.05mm-1.0mm.

[0047] Example two:

[0048] On the basis of example one, the present embodiment provides a preparation method of an insulated wire, the conductor selects a copper rod with a diameter of 12.5mm (diameter tolerance range is ±0.03mm) and oxygen content below 7PPM, and the preparation method comprises:

[0049] S100: extruding the copper into a flat shape to obtain a flat conductor;

[0050] S200: heating the flat conductor to a surface temperature of 135℃;

[0051] S300: melt the insulation layer raw material to obtain the insulation layer raw material in a molten state;

[0052] S400: the insulation layer raw material in the molten state flows to the die to coat the heated flat conductor to obtain the insulated wire;

[0053] The coating treatment temperature is 360°C.

[0054] Specifically, the extrusion uses a cold extrusion die, and the cold extrusion die has an outer dimension of 37mm*18mm (diameter of 37mm and height of 18mm).

[0055] Preferably, before step S300, the insulation layer raw material is further subjected to a drying treatment to make the insulation layer raw material reach a completely dry state.

[0056] Further, after step S400, the method further comprises:

[0057] S500: cooling treatment is performed on the insulated wire, and the cooling treatment is air cooling and air cooling.

[0058] S500: the thickness of the insulation layer of the insulated wire is detected.

[0059] Example three:

[0060] The embodiment provides a preparation method of an insulated wire, and the steps of the preparation method are the same as those of example two, and the difference lies in that the flat conductor is heated to a surface temperature of 182°C; and the coating treatment temperature is 370°C.

[0061] Example four:

[0062] The embodiment provides a preparation method of an insulated wire, and the steps of the preparation method are the same as those of example two, and the difference lies in that the flat conductor is heated to a surface temperature of 220°C; and the coating treatment temperature is 415°C.

[0063] Example five:

[0064] The embodiment provides a preparation method of an insulated wire, and the steps of the preparation method are the same as those of example two, and the difference lies in that the flat conductor is heated to a surface temperature of 235°C; and the coating treatment temperature is 420°C.

[0065] The insulated wire obtained in the above examples two to five is subjected to performance testing, and the test results are as follows: the eccentricity of the insulated wire is less than 1.21; the elongation at break of the insulated wire is not less than 40%; the resistance of the insulated wire at 20°C is 0.001Ω / m-0.003Ω / m; the rebound angle of the insulated wire is 4.4°-5.2°; and the room temperature breakdown voltage of the insulated wire is not less than 16kV.

[0066] The preparation method provided by the application can produce PEEK material products with rectangular or circular cross-sectional area and surface attachment, the rectangular size range is 0.50mm-20.00mm in length of side, and the radius of any r angle is 0.30mm-2mm, and the circular size range is 0.50mm-20.0mm in diameter.

[0067] Embodiment six:

[0068] The embodiment provides a production equipment, see Figure 4 , Figure 4 The production equipment is a structural schematic diagram of the production equipment, and is applied to the preparation method in any of the above examples. The production equipment comprises: an extrusion device 10, which is used for extruding a wire into a flat shape to obtain a flat wire; a wire storage device 30, which is used for collecting the flat wire; a preheater 40, which is used for heating the flat wire; an insulation layer material feeding device 50, which is used for placing dry insulation layer raw materials; a main machine 60, which is arranged at an outlet end of the insulation layer material feeding device 50, and is provided with a screw rod and a heater in the main machine 60, the heater is used for heating the insulation layer raw materials in the main machine 60, and the screw rod is used for pushing the melted insulation layer raw materials in the main machine 60 to a die head of the main machine 60, the die head is provided with an extrusion type extrusion die, the insulation layer raw materials in the die head are extruded to the extrusion type extrusion die, and the extrusion type extrusion die is used for coating the insulation layer materials on the flat wire to obtain an insulated wire; a cooling device 70, which is used for cooling treatment of the insulated wire, and is provided with an anti-vibration plate 71 and a self-checking device 72, the anti-vibration plate 71 is used for preventing the insulated wire from shaking, and the self-checking device 72 is used for detecting the thickness of the insulation layer of the insulated wire; an online detection device 80, which is arranged at a rear end of the cooling device 70; a conveying device 90, which is arranged at a rear end of the online detection device 80; and a wire collecting device 100, which is used for collecting the insulated wire and is arranged at a rear end of the conveying device 90.

[0069] It is worth noting that the rear end is the outlet end of the product.

[0070] Specifically, the extrusion device 10 comprises an extrusion die 20, and the extrusion die 20 can extrude the wire into a flat shape.

[0071] Specifically, the anti-vibration plate 71 is located at 1m-1.5m of an inlet end of the cooling device 70, and preferably at 1.5m. After the insulated wire is coated, the insulated wire is supported by the anti-vibration plate 71 and cooled in the cooling device 70, and the anti-vibration plate 71 can prevent abnormal conditions such as appearance defects or size defects of the product caused by shaking of the insulated wire.

[0072] Preferably, the self-checking device 72 is a plane mirror, which is used to observe the thickness of the insulating wire coating in the cooling tank, and the color depth can be distinguished, the darker color depth is the thinner coating, and vice versa, so as to adjust the position of the outer mold in time, which can greatly save the adjustment time and waste.

[0073] Specifically, the online detection device 80 uses high voltage, laser, video, etc. to detect the insulating wire product online, and the detection items include the thickness of the insulating layer, the characteristic pinhole, the bad point shooting, the identification, etc. which can greatly prevent the internal winding of the defective product from being found in time, and fundamentally eliminate the output of the defective product.

[0074] Further, the online detection device 80 includes an optical detection device for detecting the product size and the product surface particles, the measurement accuracy of the optical detection device is 0.001 mm, the measurement range is 0.50 mm-20.00 mm, and the CPK value is calculated in real time to determine whether the product quality meets the standard, and the alarm and identification are performed in time for the over-standard condition, which greatly improves the product quality. The online detection device 80 also includes an online high-voltage detection device, which can reduce the defective waste caused by high voltage.

[0075] Further, the main machine 60 is provided with four temperature zones, including: a first temperature zone of 280℃-340℃; a second temperature zone of 340℃-360℃; a third temperature zone of 350℃-380℃; and a fourth temperature zone of 350℃-370℃.

[0076] Further, the temperature control of the main machine 60 seat temperature, the main machine nozzle temperature, the main machine head temperature, and the main machine lock temperature is respectively 150℃-200℃, 360℃-420℃, 360℃-420℃, and 37℃-420℃.

[0077] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art, without departing from the spirit and scope of the present application, can make various changes and modifications, therefore the protection scope of the present application should be subject to the range defined by the claims.

Claims

1. An insulated electric wire characterized by comprising: include: wire; An insulating layer, wherein the conductor is covered with at least one layer of the insulating layer; The eccentricity of the insulated wire is less than 1.30; The aspect ratio of the conductor is less than 33%; The wire is extruded into a flat shape using an extrusion die to obtain a flat wire. The conductor has a rectangular cross-section, with four corners of the rectangle being r-angles; the radius of any r-angle of the cross-section is 0.3mm-2.0mm. The wide side of the inner hole of the extrusion die protrudes outward in an arc shape, and the protrusion value at the center of the inner hole of the extrusion die is 0.02mm-0.035mm; The smaller the width-to-width ratio of the wire, the greater the protrusion value at the center of the inner hole of the extrusion die.

2. The insulated wire according to claim 1, characterized in that, The conductor is flat; and / or The raw material for the conductor is one or more of low-oxygen copper, oxygen-free copper, copper alloy, and aluminum; and / or The raw material for the insulating layer is polyetheretherketone or modified polyetheretherketone; and / or The thickness of a single insulating layer is 0.08mm-0.50mm.

3. A method for producing an insulated electric wire, characterized by The method for preparing the insulated wire according to any one of claims 1-2 comprises: Flat wires are obtained by extruding wires into a flat shape using an extrusion die. The flat wire is heated to a surface temperature of 135°C-235°C. The insulating layer raw material is melted to obtain the insulating layer raw material in a molten state; The molten insulating material flows to the die head and coats the heated flat wire to obtain the insulated wire. The coating process is performed at a temperature of 360℃-420℃. The wide side of the inner hole of the extrusion die protrudes outward in an arc shape, and the protrusion value at the center of the inner hole of the extrusion die is 0.02mm-0.035mm.

4. The production method according to claim 3, characterized by, The coating process employs an extrusion die, which includes: An inner mold is used to limit the flat wire, which passes through the inner hole of the inner mold; An outer mold is fitted with an inner mold, and the molten insulating layer material flows in the holes of the outer mold and the inner mold. The inner diameter of the inner mold is 0.06mm-0.12mm larger than the length and width of the flat conductor, and the inner diameter of the outer mold is 0.05mm-1.0mm larger than the diameter of the insulated wire.

5. The preparation method according to claim 3, characterized in that, When the ratio of the narrow side to the wide side of the inner hole of the extrusion die is 0.25-0.33, the protrusion at the center of the inner hole of the extrusion die is 0.02mm-0.03mm; wherein, in the case that the narrow side length of the extrusion die inner hole is 1mm-3mm, the wide side length of the extrusion die inner hole is 5mm-6mm, and the cross-sectional area of the extrusion die inner hole is 10mm 2 -20mm 2 , the protrusion value at the center of the extrusion die inner hole is 0.02mm; In the case where the narrow side length of the inner hole of the extrusion die is 3 mm to 4 mm, the wide side length of the inner hole of the extrusion die is 10 mm to 13 mm, and the cross-sectional area of the inner hole of the extrusion die is 40 mm 2 - 50 mm 2 , the convex value at the center of the inner hole of the extrusion die is 0.025 mm.

6. The preparation method according to claim 3, characterized in that, When the ratio of the narrow side to the wide side of the inner hole of the extrusion die is 0.13-0.24, the protrusion at the center of the inner hole of the extrusion die is 0.03mm-0.035mm. wherein the narrow side length of the extrusion die inner hole is 1.3mm-2mm, the wide side length of the extrusion die inner hole is 7mm-20mm, and the cross-sectional area of the extrusion die inner hole is 9mm 2 -22mm 2 In the case where the narrow side length of the extrusion die inner hole is 1.3mm-2mm, the wide side length of the extrusion die inner hole is 7mm-20mm, and the cross-sectional area of the extrusion die inner hole is 9mm 2 -22mm 2 In the case where the narrow side length of the extrusion die inner hole is 1.3mm-2mm, the wide side length of the extrusion die inner hole is 7mm-20mm, and the cross-sectional area of the extrusion die inner hole is 9mm < In the case where the narrow side length of the inner hole of the extrusion die is 2 mm to 3.5 mm, the wide side length of the inner hole of the extrusion die is 10 mm to 15 mm, and the cross-sectional area of the inner hole of the extrusion die is 15 mm 2 -49 mm 2 In this case, the convex value at the center of the inner hole of the extrusion die is 0.035 mm.

7. The preparation method according to claim 3, characterized in that, The flat wire is heated under a protective gas, which is an inert gas.

8. The preparation method according to claim 3, characterized in that, The preparation method further includes: The insulated wire is subjected to a cooling treatment, which includes at least one of air cooling, wind cooling, and water cooling.

9. A production apparatus, used in the preparation method according to any one of claims 3-8, the production apparatus comprising: An extrusion device (10) is used to extrude the wire into a flat shape to obtain a flat wire; Wire collector (30) for collecting the flat wire; Preheater (40) for heating the flat wire; An insulating layer material feeding device (50) is used to place the insulating layer raw materials; The host (60) is located at the outlet end of the insulation material feeding device (50). The host (60) is equipped with a screw and a heater. The heater is used to heat the insulation material in the host (60). The screw is used to push the molten insulation material in the host (60) to the die head of the host (60). The die head is equipped with an extrusion die. The insulation material in the die head is extruded into the extrusion die. The extrusion die is used to coat the insulation material onto the flat wire to obtain the insulated wire. A cooling device (70) is used to cool the insulated wire. The cooling device (70) is provided with a shock-absorbing plate (71) and a self-testing device (72). The shock-absorbing plate (71) is used to prevent the insulated wire from shaking. The self-testing device (72) is used to visually inspect the insulation layer thickness of the insulated wire. An online detection device (80) is located at the rear end of the cooling device (70); A conveying device (90) is disposed at the rear end of the online detection device (80); A take-up device (100) is used to collect the insulated wire, and the take-up device (100) is disposed at the rear end of the conveying device (90).

10. The production equipment according to claim 9, characterized in that, The host (60) has four temperature zones, including: A temperature zone with a range of 280℃-340℃; The second temperature zone has a temperature range of 340℃-360℃; Three temperature zones, with temperatures ranging from 350℃ to 380℃; The temperature range is 350℃-370℃.

Images