A low resistivity constantan wire and its manufacturing process

Abstract

This invention provides a low-resistivity constantan wire and its production process, relating to the field of copper wire processing technology. The invention includes a mounting platform with a winding roller on one side. The constantan wire to be processed is wound around the surface of the winding roller. A drawing die is located inside the mounting platform, through which the constantan wire passes. The internal opening of the drawing die gradually narrows, making the constantan wire thinner as it passes through the die. A wiping section is also located inside the mounting platform to wipe and lubricate the constantan wire. The production process employs a dual wiping and lubrication structure. The toothed ring of the wiping section drives a circumferential array of cleaning blades to rotate around the constantan wire. Combined with lubricating oil sprayed from a spray head, this achieves comprehensive wiping and uniform lubrication of impurities on the copper wire surface. A secondary wiping is performed by an adjustable wiping wheel, effectively removing oxide layers, dust, and other impurities from the copper wire surface, preventing scratches and breakage caused by surface uncleanliness or insufficient lubrication during the drawing process.

Description

Technical Field

[0001] This invention relates to the field of copper wire processing technology, and in particular to a low resistivity constantan wire and its production process. Background Technology

[0002] Constantan wire, as an important precision alloy material, is widely used in key fields such as precision electronic components, instruments, and sensors due to its excellent resistance stability, low temperature coefficient, and strong oxidation resistance. These applications place extremely high demands on the consistency of the constantan wire's resistance coefficient, surface smoothness, and processing yield. Among these, the surface cleaning and lubrication effect during the wire drawing process directly determines the final product quality of the constantan wire.

[0003] In existing constantan wire production processes, surface treatment before drawing typically involves only a single wiping or lubrication structure, which is insufficient to achieve thorough cleaning and uniform lubrication of the copper wire surface. Traditional wiping structures often employ fixed cleaning pads or brushes, which can only perform unidirectional or localized wiping of the copper wire surface, failing to achieve circumferential and all-around coverage. This results in the inability to completely remove residual oxide layers, dust, oil, and other impurities adhering to the copper wire surface during production.

[0004] Therefore, how to solve the problems of incomplete wiping of constantan wire, uneven lubrication, and poor compatibility in the existing process, effectively remove surface impurities, ensure sufficient lubrication, and thus improve product quality and production efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low resistivity constantan wire and its manufacturing process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a low resistivity constantan wire production process, comprising a mounting platform arranged horizontally, a winding roller rotatably supported on the outer wall of one end of the mounting platform, and constantan wire to be processed wound on the outer circumferential surface of the winding roller; a through processing channel is formed inside the mounting platform along its length, and a wiping part and a drawing die are arranged sequentially in the processing channel, with the wiping part located between the winding roller and the drawing die; the inner diameter of the drawing die gradually narrows along the conveying direction of the constantan wire, so that the constantan wire passing through the drawing die gradually becomes thinner along its axial direction; the wiping part can circumferentially wipe and lubricate the constantan wire during the conveying process.

[0007] Preferably, the wiping unit includes an operating chamber located inside the mounting platform. The operating chamber is an annular cavity coaxial with the processing channel. Multiple mounting rods are fixedly connected to the circumferential inner wall of the operating chamber. These mounting rods are arranged in a circular array along the central axis of the operating chamber. The free end of each mounting rod is rotatably connected to a clamping wheel via a pivot. An annular groove is formed in the center of the outer circumferential surface of each clamping wheel. The annular grooves of the multiple clamping wheels collectively clamp a toothed ring. The toothed ring is coaxial with the processing channel and can rotate around its own axis under the support of the multiple clamping wheels. A spray head is fixedly installed on the top inner wall of the operating chamber. The spray direction of the spray head is towards the central axis of the processing channel, and it can spray lubricating oil onto the constantan wire passing through the toothed ring.

[0008] Preferably, a No. 1 motor is fixedly connected to one inner wall of the operating chamber. The output shaft of the No. 1 motor is arranged along the tangential direction of the operating chamber, and a drive gear is fixedly connected to the output end of the No. 1 motor. The drive gear meshes with the outer peripheral teeth of the gear ring, which can drive the gear ring to rotate around its own axis. A cleaning plate is fixedly connected to the inner peripheral surface of the gear ring, and the constantan wire passes through the cleaning plate along the central axis of the gear ring.

[0009] Preferably, multiple cleaning pads are provided, and the multiple cleaning pads are arranged in a circumferential array along the inner circumferential surface of the toothed ring; each cleaning pad is bent and protruded towards the central axis of the toothed ring, and a brush is fixedly connected to the free end of the cleaning pad; the cleaning pad is bent by its own elastic compression, so that the brush fits tightly against the outer circumferential surface of the constantan wire; when the toothed ring rotates, it drives the multiple cleaning pads to move circumferentially around the constantan wire, so as to achieve all-round wiping of the constantan wire surface.

[0010] Preferably, a mounting frame is fixedly connected inside the operating chamber and between the wiping section and the wire drawing die. The mounting frame is shaped like a gate spanning above the processing channel. A conveying assembly base is fixedly connected to the bottom of the mounting frame. Two conveying rollers are symmetrically arranged vertically inside the conveying assembly base. The outer circumferential surfaces of the two conveying rollers are in contact with each other, and the constantan wire is clamped between the two conveying rollers. A second motor is fixedly connected to the upper end of the mounting frame. The output shaft of the second motor is connected to the two conveying rollers through a gear set, which can drive the two conveying rollers to rotate in opposite directions, thereby driving the constantan wire to move linearly along the processing channel towards the wire drawing die.

[0011] Preferably, a column is vertically fixed to the upper end face of the roller, and a turntable is rotatably connected to the outer peripheral wall of the column via a bearing; a combing arm is fixedly connected to the outer peripheral wall of the turntable, the combing arm extends radially outward along the turntable, and a sleeve is fixedly connected to the free end of the combing arm; the end of the constantan wire wound on the surface of the roller away from the roller passes through the sleeve and enters the operating chamber, and the turntable can rotate around the axis of the column, driving the combing arm and the sleeve to swing circumferentially, thereby combing the constantan wire on the roller.

[0012] Preferably, a fixed arm is fixedly connected to the lower part of the mounting frame. The fixed arm extends downward in a vertical direction, and the lower end of the fixed arm is rotatably connected to two wiping wheels via a rotating shaft. The two wiping wheels are symmetrically distributed on both sides of the processing channel, and the outer peripheral surfaces of the two wiping wheels are clamped together on the surface of the constantan wire. When the constantan wire is pulled and moved along the processing channel, it can drive the two wiping wheels to rotate synchronously around their own rotating shafts to perform secondary wiping on the surface of the constantan wire.

[0013] Preferably, each wiping wheel includes two parallel circular clamps. Multiple wiping strips are uniformly fixedly connected between the two clamps along their circumference. These wiping strips are arranged in a circumferential array along the central axis of the clamps, with the middle portion of each strip recessed towards the central axis to form a clamping surface compatible with the constantan wire. A rotating cylinder is vertically fixedly connected to the upper end of each clamp, and the rotating cylinder is rotatably connected to the lower end of a fixed arm via a bearing. Multiple fastening bolts are uniformly inserted between the two clamps along their circumference. Nuts are threaded onto both ends of each fastening bolt. Tightening or loosening the nuts adjusts the distance between the two clamps, thereby changing the degree of concavity of the wiping strips to accommodate constantan wires of different diameters.

[0014] Preferably, the fastening bolt has a flow guide cavity along its axial direction inside, and the lower end of the fastening bolt is connected to an infusion tube. The end of the infusion tube away from the fastening bolt is connected to an oil pump. Multiple infusion tubes are fixedly connected to the outer peripheral wall of the fastening bolt. The multiple infusion tubes are arranged inclined downwards along the circumference of the fastening bolt, and the interior of the infusion tubes is connected to the flow guide cavity. The free ends of the multiple infusion tubes are fixedly connected to a connecting ring. The connecting ring is located inside the area surrounded by multiple wiping strips, and the inner peripheral surface of the connecting ring is opposite to the outer peripheral surface of the constantan wire. Multiple leakage ports are opened on the surface of the infusion tubes. The lubricating oil delivered by the oil pump can flow sequentially through the infusion tube, the flow guide cavity, the infusion tube, and the leakage ports to the connecting ring, and then evenly wet the surface of the wiping strips through the connecting ring. A collection hopper is fixedly installed on the bottom inner wall of the operating chamber. The collection hopper is located directly below the wiping part and the wiping wheel part, and can collect the dripping lubricating oil.

[0015] Preferably, a constantan wire with low resistivity is prepared using any of the low resistivity constantan wire production processes described in the present invention, wherein the chemical composition of the constantan wire, by mass percentage, is: Cu: 59.0%-61.0%, Ni: 38.5%-40.0%, Mn: 0.8%-1.2%.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, by precisely optimizing the chemical composition ratio of constantan wire, the Cu content is controlled at 59.0%-61.0%, the Ni content at 38.5%-40.0%, and the Mn content at 0.8%-1.2%. After multiple experiments, it has been verified that this ratio can effectively reduce the resistivity of constantan wire and has strong resistance stability. It can meet the application requirements of precision electronics, instruments and meters and other scenarios with strict requirements for resistance performance, and solve the problems of high resistivity and poor consistency of traditional constantan wire.

[0017] 2. In this invention, a dual-wiping and lubrication structure is incorporated into the production process. The first stage involves a toothed ring on the wiping section driving a circumferential array of cleaning blades to rotate around the constantan wire. The cleaning blades, utilizing their own elasticity, ensure the brushes adhere tightly to the copper wire surface. Combined with lubricating oil sprayed from the spray head, this achieves comprehensive wiping and uniform lubrication of impurities on the copper wire surface. The second stage involves an adjustable wiping wheel for secondary wiping of the copper wire. Lubricating oil is precisely delivered to the wiping strips via a guide cavity and delivery pipe, ensuring sufficient lubrication. This dual-structure synergistic effect effectively removes oxide layers, dust, and other impurities from the copper wire surface, preventing scratches and breakages caused by surface uncleanliness or insufficient lubrication during the wire drawing process. This significantly improves the smoothness of the constantan wire surface and the processing yield.

[0018] 3. In this invention, the wiping wheel can flexibly adjust the distance between the two clamping plates by fastening the bolts and nuts, thereby changing the degree of concavity of the wiping strip. This can adapt to the processing requirements of constantan wire of different diameters without the need to change special tooling, reducing production changeover costs. At the same time, the comb arm and sleeve can comb the constantan wire released by the winding roller, avoiding tangling and knotting, ensuring the smoothness of the conveying process of copper wire of different specifications, and improving the versatility and practicality of the process.

[0019] 4. In this invention, two conveying rollers are driven to rotate in opposite directions by a second motor, providing stable and continuous conveying power for the constantan wire. Combined with the structure of the gradually shrinking inner hole of the drawing die, continuous wire drawing processing of copper wire is achieved. Compared with the traditional manual assisted conveying method, production efficiency is greatly improved. Multiple clamping wheels in the wiping section provide stable support for the toothed ring, ensuring that the toothed ring rotates smoothly under the drive gear. The contact pressure between the cleaning plate and the copper wire is uniform, avoiding component wear caused by excessive local friction, extending the service life of the equipment, and ensuring the stability of the production process.

[0020] In this invention, the collection hopper at the bottom of the operating chamber can collect and recycle the lubricating oil dripping during the wiping process. After processing, it can be reused, reducing the waste of lubricating oil and lowering the cost of production consumables. At the same time, the dual wiping lubrication structure reduces the frictional wear between the mold and the copper wire during the wire drawing process, reducing the frequency of equipment maintenance and energy consumption, which meets the requirements of energy-saving and environmentally friendly production. Attached Figure Description

[0021] Figure 1 A three-dimensional structural diagram of a low resistivity constantan wire and its manufacturing process is provided for this invention. Figure 2 This invention presents a partial structural schematic diagram of a low resistivity constantan wire and its manufacturing process. Figure 3 This invention provides a low resistivity constantan wire and a partial schematic diagram of the winding roller in its production process. Figure 4 This invention provides a low resistivity constantan wire and a partial schematic diagram of the wiping section in its manufacturing process. Figure 5 This invention presents a low resistivity constantan wire and a partial internal schematic diagram of its manufacturing process. Figure 6 This invention proposes a low resistivity constantan wire and its manufacturing process. Figure 4 Enlarged view of point A; Figure 7 This invention proposes a low resistivity constantan wire and its manufacturing process. Figure 5 Enlarged view of point B.

[0022] Legend: 1. Mounting platform; 2. Roller; 3. Column; 4. Turntable; 5. Combing arm; 6. Mounting frame; 7. Conveyor assembly seat; 8. Conveyor roller; 9. Wiping section; 91. Motor No. 1; 92. Mounting rod; 93. Clamping wheel; 94. Gear ring; 95. Cleaning disc; 96. Drive gear; 10. Collection hopper; 11. Infusion tube; 12. Fixing arm; 13. Clamping plate; 14. Fastening bolt; 15. Wiping strip; 16. Guide cavity; 17. Infusion tube; 18. Connecting ring. Detailed Implementation

[0023] like Figure 1-7As shown, this invention provides a low-resistivity constantan wire and its manufacturing process. A mounting platform 1 is arranged horizontally. A winding roller 2 is rotatably supported on the outer wall of one end of the mounting platform 1 via a bearing seat. The outer circumferential surface of the winding roller 2 is used to wind the constantan wire to be processed. A through processing channel is formed inside the mounting platform 1 along its length. A wiping section 9 and a drawing die are sequentially arranged within the processing channel along the conveying direction of the constantan wire. The wiping section 9 is located between the winding roller 2 and the drawing die. The inner diameter of the drawing die gradually narrows along the conveying direction of the constantan wire, allowing the constantan wire passing through the drawing die to gradually become thinner along its axial direction. The wiping section 9 is used to circumferentially wipe and lubricate the constantan wire during the conveying process. The wiping section 9 includes an operating mechanism located inside the mounting platform 1. The operating chamber is an annular cavity coaxial with the processing channel. Multiple mounting rods 92 are fixedly connected to the inner circumferential wall of the operating chamber, arranged in a circular array along the central axis of the operating chamber. The free end of each mounting rod 92 is rotatably connected to a clamping wheel 93 via a pivot. An annular groove is formed in the center of the outer circumference of each clamping wheel 93. The annular grooves of the multiple clamping wheels 93 collectively clamp a toothed ring 94. The toothed ring 94 is coaxial with the processing channel and can rotate smoothly around its own axis with the support of the clamping wheels 93. A spray head is fixedly installed on the top inner wall of the operating chamber, spraying towards the central axis of the processing channel, precisely spraying lubricating oil onto the constantan wire passing through the toothed ring 94. One side of the operating chamber... A No. 1 motor 91 is fixedly connected to the inner wall. The output shaft of the No. 1 motor 91 is arranged tangentially to the operating chamber. A drive gear 96 is fixedly connected to the output end of the No. 1 motor 91. The drive gear 96 meshes with the outer circumferential teeth of the gear ring 94 for transmission. After starting the No. 1 motor 91, it can drive the gear ring 94 to rotate stably around its own axis. A cleaning plate 95 is fixedly connected to the inner circumferential surface of the gear ring 94. A constantan wire passes through the cleaning plate 95 along the central axis of the gear ring 94. Multiple cleaning plates 95 are provided, and the multiple cleaning plates 95 are arranged in a circumferential array along the inner circumferential surface of the gear ring 94. Each cleaning plate 95 is bent and protruded towards the central axis of the gear ring 94. A brush is fixedly connected to the free end of the cleaning plate 95 by adhesive bonding. The cleaning plate 95 is bent by its own elasticity, so that... The brush can fit closely against the outer circumference of the constantan wire. When the toothed ring 94 rotates, it drives multiple cleaning blades 95 to move circumferentially around the constantan wire, thereby achieving all-round wiping of the constantan wire surface. Inside the operating chamber, between the wiping section 9 and the wire drawing die, a mounting frame 6 is fixedly connected. The mounting frame 6 is shaped like a gate spanning above the processing channel. The bottom of the mounting frame 6 is fixedly connected to a conveyor assembly seat 7. Inside the conveyor assembly seat 7, two conveyor rollers 8 are symmetrically arranged vertically. The outer circumferences of the two conveyor rollers 8 are in contact with each other, and the constantan wire is clamped between the two conveyor rollers 8. The upper end of the mounting frame 6 is fixedly connected to a second motor. The output shaft of the second motor is connected to the two conveyor rollers 8 through a gear set. After starting the second motor, it can drive the two conveyor rollers 8 to rotate in the opposite direction.This causes the constantan wire to move smoothly in a straight line along the processing channel towards the drawing die. A column 3 is vertically fixed to the upper end of the roller 2. A turntable 4 is rotatably connected to the outer peripheral wall of the column 3 via bearings. A combing arm 5 is fixedly connected to the outer peripheral wall of the turntable 4, extending radially outwards. A sleeve is fixedly connected to the free end of the combing arm 5. The end of the constantan wire wound on the surface of the roller 2 away from the roller 2 passes through the sleeve and enters the operating chamber. The turntable 4 can rotate around the axis of the column 3. During rotation, it causes the combing arm 5 and the sleeve to oscillate circumferentially, thereby combing the constantan wire on the roller 2 and preventing it from tangling. A fixing arm 12 is fixedly connected to the lower part of the mounting frame 6, extending downwards in the vertical direction. The lower end of the fixed arm 12 is rotatably connected to two wiping wheels via a rotating shaft. The two wiping wheels are symmetrically distributed on both sides of the processing channel. The outer circumferential surfaces of the two wiping wheels clamp the surface of the constantan wire. When the constantan wire is pulled along the processing channel, it drives the two wiping wheels to rotate synchronously around their own shafts, thus performing a secondary wiping of the constantan wire surface and further improving its cleanliness. Each wiping wheel includes two parallel circular clamping plates 13. Multiple wiping strips 15 are uniformly fixedly connected between the two clamping plates 13 along their circumference. The wiping strips 15 are made of wear-resistant fiber material, and are arranged in a circumferential array along the central axis of the clamping plates 13. The center of each wiping strip 15 is recessed towards the central axis of the clamping plates 13, forming a groove with the constantan wire. The clamping surface is adapted to the copper wire. A rotating drum is vertically fixed to the upper end of the clamping plate 13. The rotating drum is rotatably connected to the lower end of the fixed arm 12 via a bearing. Multiple fastening bolts 14 are evenly inserted circumferentially between the two clamping plates 13. Nuts are threaded onto both ends of the fastening bolts 14. By tightening or loosening the nuts, the distance between the two clamping plates 13 can be adjusted, thereby changing the degree of concavity of the wiping strip 15 to accommodate constantan wires of different diameters. A guide cavity 16 is formed axially inside the fastening bolt 14. The lower end of the fastening bolt 14 is connected to an infusion tube 11 via a threaded connection. The end of the infusion tube 11 away from the fastening bolt 14 is connected to an external oil pump. Multiple delivery tubes 17 are fixedly connected to the outer peripheral wall of the fastening bolt 14. The multiple delivery tubes 17 extend along the fastening bolt. The circumferential direction of the wiping strip 14 is inclined downward. The interior of the liquid delivery pipe 17 is connected to the guide cavity 16. The free ends of multiple liquid delivery pipes 17 are fixedly connected to a connecting ring 18. The connecting ring 18 is located inside the area surrounded by multiple wiping strips 15. The inner circumferential surface of the connecting ring 18 is opposite to the outer circumferential surface of the constantan wire. Multiple leakage ports are opened on the surface of the liquid delivery pipe 17. The lubricating oil delivered by the oil pump can flow sequentially through the liquid delivery pipe 11, the guide cavity 16, the liquid delivery pipe 17 and the leakage ports to the connecting ring 18, and then evenly wet the surface of the wiping strip 15 through the connecting ring 18. A collection hopper 10 is fixedly installed on the bottom inner wall of the operating chamber. The collection hopper 10 is located directly below the wiping part 9 and the wiping wheel part, which can collect the dripping lubricating oil for subsequent recycling.This low-resistivity constantan wire is manufactured using the above-mentioned process. Its chemical composition, by mass percentage, is Cu 59.0%-61.0%, Ni 38.5%-40.0%, and Mn 0.8%-1.2%. This composition ratio has been optimized through multiple experiments to ensure the constantan wire possesses the characteristic of a low resistivity.

[0024] Working principle: The constantan wire to be processed wound on the winding roller 2 first passes through the sleeve at the end of the combing arm 5. The turntable 4 rotates around the column 3, causing the combing arm 5 and the sleeve to swing circumferentially, combing the constantan wire released from the winding roller 2 to avoid tangling and knotting. The combed constantan wire enters the processing channel of the mounting platform 1. After the second motor starts, it drives the two conveying rollers 8 to rotate in opposite directions through the gear set. With the help of the friction between the two conveying rollers 8 and the constantan wire, the constantan wire is smoothly conveyed along the processing channel towards the wire drawing die. During the conveying process, the constantan wire first passes through the wiping section 9. The spray head on the top of the operating room sprays lubricating oil onto the constantan wire. At the same time, the first motor 91 starts and drives the drive gear 96 to rotate. The drive gear 96 meshes with the gear ring 94 and drives the gear ring 94 to rotate around its own axis. When the gear ring 94 rotates, it drives multiple cleaning blades 95 to move circumferentially around the constantan wire. The cleaning blades 95 use their own elasticity to make the brushes fit tightly against the surface of the constantan wire, realizing all-round wiping and cleaning of the constantan wire surface. At the same time, the sprayed lubricating oil is sprayed out. The constantan wire is evenly coated on the surface to complete the first wiping lubrication. Afterward, the constantan wire is conveyed between two wiping wheels. As the constantan wire moves, it drives the two wiping wheels to rotate synchronously. The wiping strips 15 of the wiping wheels perform a second wiping of the constantan wire surface to further remove surface impurities. At the same time, an external oil pump delivers lubricating oil to the guide cavity 16 of the fastening bolt 14 through the liquid delivery pipe 11, and then flows to the connecting ring 18 through the leakage port of the liquid delivery pipe 17. The connecting ring 18 evenly wets the surface of the wiping strips 15, so that lubrication is achieved synchronously during the second wiping process, ensuring that the constantan wire surface is fully lubricated. The constantan wire, after being wiped and lubricated twice, then enters the drawing die. With the help of the gradually shrinking structure of the drawing die's inner hole, it gradually becomes thinner along the axial direction to reach the required diameter specification. The lubricating oil dripping during the wiping process is collected by the collection hopper 10 below and can be recycled. The entire production process, through reasonable structural layout and component matching, combined with specific chemical composition ratios, ultimately produces constantan wire with a low resistivity coefficient.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may utilize the disclosed technical content to make changes or modifications to create equivalent embodiments applicable to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, still fall within the protection scope of the present invention. In the description of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

Claims

1. A process for producing constantan wire with low resistivity, characterized in that: The device includes a mounting platform (1), on one side of which is a winding roller (2), on the surface of which is wound with constantan wire to be processed. A wire drawing die is provided inside the mounting platform (1), through which the constantan wire passes. The internal hole of the wire drawing die gradually shrinks, and the constantan wire becomes thinner as it passes through the wire drawing die. A wiping part (9) is provided inside the mounting platform (1), which can wipe and lubricate the constantan wire.

2. The production process of low resistivity constantan wire according to claim 1, characterized in that: The wiping part (9) includes a mounting rod (92), and a clamping wheel (93) is rotatably connected to the end of the mounting rod (92). The clamping wheel (93) is recessed in the middle. Multiple mounting rods (92) are provided and are distributed in a circumferential array. A toothed ring (94) is provided on the surface of the multiple clamping wheels (93). The toothed ring (94) is clamped on the surface of the multiple clamping wheels (93). The multiple clamping wheels (93) are supported inside the toothed ring (94) to fix the toothed ring (94) and allow the toothed ring (94) to rotate on the surface of the multiple clamping wheels (93). An operating chamber is provided inside the mounting platform (1). The interior of the operating chamber is fixed to the mounting rod (92). A spray head is provided inside the operating chamber, which can spray lubricating oil onto the constantan wire.

3. The production process of low resistivity constantan wire according to claim 2, characterized in that: The operating room is fixedly connected to a No. 1 motor (91), and the output end of the No. 1 motor (91) is fixedly connected to a drive gear (96). The drive gear (96) and the gear ring (94) mesh and drive each other. The surface of the gear ring (94) is uniformly provided with cleaning plates (95), and the constantan wire passes through the cleaning plates (95).

4. The low resistivity constantan wire production process according to claim 3, characterized in that: Multiple cleaning plates (95) are provided, and the multiple cleaning plates (95) are arranged in a circumferential array on the surface of the toothed ring (94). The cleaning plates (95) are bent, and a brush is provided at the port of the cleaning plate (95). The cleaning plate (95) is squeezed and bent so that the brush is attached to the surface of the constantan wire. The cleaning plate (95) can wipe the surface of the constantan wire.

5. The production process of low resistivity constantan wire according to claim 4, characterized in that: The operating room is fixedly connected to a mounting frame (6), and the bottom of the mounting frame (6) is fixedly connected to a conveying assembly seat (7). The conveying assembly seat (7) is fixedly connected to two conveying rollers (8), and the constantan wire is sandwiched between the two conveying rollers (8). The upper end of the mounting frame (6) is fixedly connected to a second motor, and the output shaft of the second motor drives the conveying rollers (8) to rotate. The constantan wire can be transported towards the wire drawing die by the conveying rollers (8).

6. The low resistivity constantan wire production process according to claim 5, characterized in that: The upper end of the roller (2) is fixedly connected to a column (3), and a turntable (4) is rotatably connected to the surface of the column (3). A combing arm (5) is fixedly connected to the side of the turntable (4), and a sleeve is fixedly connected to the end of the combing arm (5). The constantan wire wound on the surface of the roller (2) passes through the sleeve, and the sleeve can be used to support the constantan wire for combing.

7. The production process of low resistivity constantan wire according to claim 6, characterized in that: A fixed arm (12) is fixedly connected to the lower part of the mounting bracket (6). A wiping wheel is rotatably connected to the lower end of the fixed arm (12). There are two wiping wheels. The two wiping wheels are clamped on the surface of the constantan wire. During the pulling and moving of the constantan wire, the two wiping wheels are rotated to wipe the constantan wire.

8. The production process of low resistivity constantan wire according to claim 7, characterized in that: The wiping wheel includes two clamping plates (13), and multiple wiping strips (15) are fixedly connected between the two clamping plates (13). The multiple wiping strips (15) are arranged in a circumferential array, and the middle part of the wiping strips (15) is recessed towards the center of the array. The wiping wheel uses the central recess to clamp the constantan wire. A rotating drum is fixedly connected to the upper end of the clamping plate (13). The rotating drum and the fixed arm (12) are rotatably connected. A fastening bolt (14) is vertically inserted between the two clamping plates (13). The surface of the fastening bolt (14) is threaded with a nut. The degree of concavity of the wiping strips (15) can be adjusted by using the fastening bolt (14) and the nut to clamp the two clamping plates (13) to adapt to constantan wires of different thicknesses.

9. The production process of low resistivity constantan wire according to claim 8, characterized in that: The fastening bolt (14) has a flow guide cavity (16) inside. The lower part of the fastening bolt (14) is connected to the infusion pipe (11). The infusion pipe (11) is connected to an oil pump. Multiple inclined liquid delivery pipes (17) are fixedly connected to the surface of the fastening bolt (14). The ports of the multiple liquid delivery pipes (17) are fixedly connected to a connecting ring (18). The connecting ring (18) is located inside the multiple wiping strips (15). The surface of the liquid delivery pipe (17) has a leakage port. The lubricant delivered by the oil pump can be delivered along the inclined downward liquid delivery pipe (17) to the connecting ring (18), and then delivered to the surface of the wiping strip (15) by the connecting ring (18) to wipe the constantan wire. The operating chamber is equipped with a collection hopper (10), which can collect the dripping lubricating oil.

10. A constantan wire with a low resistivity, characterized in that: The production process of constantan wire with low resistivity according to any one of claims 1-9 includes the following materials: Cu: 59.0%-61.0%, Ni: 38.5%-40.0%, Mn: 0.8%-1.2%.

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