Copper wire shielding aluminum alloy cable and copper wire calendaring processing method thereof

Abstract

The invention relates to the technical field of copper wire calendaring, in particular to a copper wire shielding aluminum alloy cable and a copper wire calendaring processing method thereof.The method comprises the following steps that S1, copper rods are subjected to quality screening and classified, and quality screening comprises physical screening and chemical screening; s2, the screened copper rods are pretreated, wherein pretreatment at least comprises copper rod surface cleaning treatment and oxide layer removing treatment; s3, the pretreated copper rod is subjected to preheating treatment, namely temperature control heating, so that the internal molecular structure of metal is adjusted, and the heating temperature ranges from 300 DEG C to 500 DEG C; s4, the copper rod subjected to preheating treatment is fed into a rolling wheel of a calender to be calendered, and S5, annealing treatment at least comprises natural cooling and cooling through a cooling medium. Under the condition that the fracture rate of the copper wire is controllable, the calendering efficiency is improved, and the calendering efficiency is further improved through automatic butt-joint calendering.

Description

Technical Field

[0001] The invention relates to the technical field of copper wire rolling, and in particular to a copper wire shielded aluminum alloy cable and a copper wire rolling processing method thereof. Background Art

[0002] The cable is made of one or more mutually insulated conductors and an outer insulating protective layer. It is a wire that transmits electricity or information from one place to another. In order to meet market demand, the current wire core is made of aluminum alloy, wrapped with a protective layer and a copper wire shielding layer.

[0003] The rolling of copper wire is one part of the copper wire manufacturing process. During the rolling process, when each copper rod passes through the initial pressing roller, one end of the copper rod will be controlled by pliers or other tools, and then slowly aligned between the subsequent pressing rollers for feeding. This is dangerous for the workers and affects the efficiency of rolling to a certain extent. Summary of the invention

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art: when each copper rod passes through the initial pressing roller, one end of the copper rod is controlled by tools such as pliers and slowly aligned between the subsequent pressing rollers for feeding, which is dangerous to the workers and affects the efficiency of rolling to a certain extent. A copper wire shielded aluminum alloy cable and a copper wire rolling processing method thereof are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for processing copper wire rolling in a copper wire shielded aluminum alloy cable comprises the following steps:

[0007] S1, quality screening and classification of copper rods, quality screening includes physical screening and chemical screening;

[0008] S2, pre-treating the screened copper rods, wherein the pre-treatment at least includes cleaning the copper rod surface and removing the oxide layer;

[0009] S3, preheating the pretreated copper rod, i.e., heating it under controlled temperature, so as to adjust the internal molecular structure of the metal, and the heating temperature is 300-500 degrees Celsius;

[0010] S4, sending the preheated copper rod to the roller of a calender for calendering, wherein the calendering comprises at least the following steps:

[0011] a. Send the copper rod along the limiting sleeve 1 between the two front rolling wheels. A high temperature resistant bearing is arranged between the limiting sleeve 1 and the front rolling wheels to maintain their respective stability and not interfere with each other. A sensing module for sensing the thickness change of the copper rod is arranged in the limiting sleeve 1. The sensing module converts the thickness change into pressure change and then converts it into pressure data and transmits it to the data terminal. A speed measuring module is connected to the rotating shaft of the front rolling wheel. The speed measuring module transmits the speed data of the front rolling wheel to the data terminal, and records the data corresponding to different speeds and different pressures;

[0012] b. The copper rod coming out of the front rolling wheel after the initial rolling automatically enters the limit sleeve 2. The limit sleeve 2 is provided with an adjustment module for adjusting the height of the copper rod and an optical distance meter. After the adjustment module adjusts the height of the copper rod, the optical distance meter will collect the distance data between the limit plate and the upper side wall of the limit sleeve 2, and the collected distance signal is transmitted to the data terminal;

[0013] c. The two rear rolling wheels will receive the copper rod from the front rolling wheel as the secondary rolling. The two rear rolling wheels are installed on a movable plate, and the movable plate is corrected by the correction module. The copper rod coming out of the second limit sleeve will automatically enter between the two rear rolling wheels for secondary rolling through the joint action of the adjustment module, the optical rangefinder and the correction module;

[0014] S5, annealing treatment, the annealing treatment at least includes natural cooling and cooling using a cooling medium;

[0015] S6, copper wire quality inspection, including at least diameter inspection, shape inspection, surface quality inspection, and electrical conductivity inspection;

[0016] S7, processing the tested copper wire into a copper wire shielding layer, and then manufacturing the copper wire shielded aluminum alloy cable.

[0017] Preferably, the above-mentioned sensing module includes a pressure sensor arranged on one side wall of the limit sleeve, a pressure block and an insulating pad installed between the pressure block and the pressure sensor. During the rolling process, the unrolled part of the copper rod will expand and thicken as the internal molecules move, and the pressure block will be squeezed at this time. The pressure generated will be received by the pressure sensor and transmitted to the data terminal, and database one and database two will be established in the data terminal. A threshold is set between database one and database two, and data exceeding the threshold enters database two.

[0018] Preferably, a database three is established in the data terminal, and the rotation speed data collected in the speed measurement module enters the database three and keeps correlation with the database one at all times.

[0019] Preferably, the limit sleeve 2 is arranged between the calendering front wheel and the calendering rear wheel, and the adjustment module is arranged in the limit sleeve 2, the adjustment module includes a telescopic cylinder 1, the telescopic cylinder 1 is used to adjust the height of the limit plate, that is, the distance between the limit plate and the upper side wall of the limit sleeve 2, and a rotatable limit column is provided at one end of the limit plate close to the calendering front wheel, which is used to quickly guide the copper rod after the initial rolling between the limit plate and the optical rangefinder. At this time, the optical rangefinder collects distance data, creates a folder in the data terminal, and pre-sets a correction function in the folder, and the collected data is imported into the correction function.

[0020] Preferably, the result of the correction function is to calculate the center point coordinates of the distance, and the correction module controls the movement of the movable plate according to the center point coordinates, making the longitudinal coordinates of the center point coordinates between the centers of the two rear rolling wheels the same as the longitudinal coordinates of the center point coordinates of the distance.

[0021] A copper wire shielded aluminum alloy cable, comprising a cable, an armor layer and an outer sheath, wherein the cable comprises at least a conductor core and an insulating layer, and is characterized in that a copper wire shielding layer is provided on the outer layer of the cable, the cable is connected in sections, a space formed between the copper wire shielding layer and the armor layer is filled with a liquid having an inert property, and sealing layers are installed at both ends of the cable.

[0022] Preferably, the liquid includes at least one of pure water, mineral oil and fluorinated liquid.

[0023] Preferably, a cardboard with high hardness is provided between the armor layer and the outer sheath.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. While ensuring that the copper wire breakage rate is controllable, the calendering efficiency is improved, and the calendering efficiency is further improved through automatic docking calendering.

[0026] 2. Protect the cables in various ways to extend their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A partial cross-sectional schematic diagram of a rolling process of a method for rolling copper wires in a copper wire shielded aluminum alloy cable proposed by the present invention;

[0028] Figure 2 This is a schematic diagram of the partially enlarged structure of a copper wire shielded aluminum alloy cable.

[0029] In the figure: 1 cable, 2 sealing layer, 3 armor layer, 4 outer sheath, 5 cardboard, 6 high temperature resistant bearing, 7 limit sleeve 1, 8 pressure block, 9 pressure sensor, 10 limit column, 11 telescopic cylinder 1, 12 optical rangefinder, 13 limit plate, 14 rolled rear wheel, 15 movable plate, 16 rolled front wheel. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1 A method for processing copper wire rolling in a copper wire shielded aluminum alloy cable comprises the following steps:

[0032] S1, quality screening and classification of copper rods. Quality screening includes physical screening and chemical screening. Physical screening includes mechanical property testing, such as but not limited to testing and screening of parameters such as tensile strength, yield strength, elongation, etc. Chemical screening mainly includes measuring the copper content, impurity content and other parameters of the copper rods.

[0033] S2, pre-treating the screened copper rods, the pre-treatment at least includes copper rod surface cleaning and oxide layer removal, wherein the copper rod surface cleaning mainly removes oil stains on the copper rod surface, and the oxide layer removal treatment is to soak the copper rod in a chemical polishing solution for 1-3 minutes, and control the temperature at 40-50 degrees Celsius, or use an acid solution, a detergent for oxide removal, or use a physical method such as sandpaper polishing to remove the oxide layer.

[0034] S3, preheating treatment is performed on the pretreated copper rod, i.e. temperature-controlled heating, so as to adjust the internal molecular structure of the metal. The heating temperature is 300-500 degrees Celsius, which is convenient for subsequent rolling.

[0035] S4, sending the preheated copper rod to the roller of a calender for calendering, wherein the calendering comprises at least the following steps:

[0036] a. The copper rod is fed into between two front rolling wheels 16 along a limiting sleeve 7. A high temperature resistant bearing 6 is arranged between the limiting sleeve 7 and the front rolling wheel 16 to maintain their respective stability and not interfere with each other. A sensing module for sensing the thickness change of the copper rod is arranged in the limiting sleeve 7. The sensing module converts the thickness change into pressure change and then converts it into pressure data and transmits it to the data terminal. A speed measuring module is connected to the rotating shaft of the front rolling wheel 16. The speed measuring module transmits the speed data of the front rolling wheel 16 to the data terminal, and records data corresponding to different speeds and different pressures. The upper sensing module includes a sensor module arranged on the side wall of the limiting sleeve 7. The pressure sensor 9, the pressure block 8 and the heat insulating pad installed between the pressure block 8 and the pressure sensor 9, during the rolling process, the unrolled part of the copper rod will expand and thicken with the movement of the internal molecules, and the pressure block 8 will be squeezed at this time. The pressure generated will be received by the pressure sensor 9 and transmitted to the data terminal, and database one and database two are established in the data terminal. A threshold is set between database one and database two, and the data exceeding the threshold enters database two. Database three is established in the data terminal, and the rotation speed data collected in the speed measurement module enters database three and keeps correlation with database one at all times.

[0037] In the above process, a straightening process can be added before the limit sleeve 7 according to actual conditions to facilitate the subsequent copper rod rolling. When the copper rod enters the rolling front wheel 16 for rolling, the speed data of the rolling front wheel 16 will be recorded and transmitted to the database 3, and the recorded data is R. At the same time, the molecules inside the copper rod will move backwards, that is, Figure 1 The left direction will cause the accumulation of some molecules that have not been rolled later, thereby making the copper rod part thicker. The end face of the pressure block 8 protrudes from the inner wall of the limit sleeve 7, and the copper rod is located at the center of the limit sleeve 7. The thickened copper rod will continuously squeeze the pressure blocks 8 on both sides, and the pressure signal of this part will be transmitted to the database 1 through the pressure sensor 9 and compared with the threshold value. Data greater than the threshold value will be sent to the database 2.

[0038] Establishment of threshold value: The threshold value is represented by Q. In the copper wire rolling process, the rotation speed of the rolling front wheel 16 has a range. This range is suitable for some copper wire rolling processes. Within this range, the fracture rate of the rolled copper rod has a controllable range. At this time, the rotation speed of the rolling front wheel 16 has an upper limit, represented by V1. This upper limit of the speed corresponds to the degree of thickening of the copper rod when it is rolled, and there will also be a corresponding pressure value, which is the threshold value.

[0039] The rotation speed of the front rolling wheel 16 is increased slowly, and the data in the database 3 is continuously recorded. At the same time, different rotation speeds correspond to different pressure values. When the pressure value exceeds the threshold, these data will enter the database 2, and the rotation speed data in the database 3 that is associated with it will also enter. A curve chart of real-time detection is drawn with the rotation speed as the horizontal axis and the pressure value as the vertical axis. When the pressure value suddenly increases rapidly, regardless of whether the copper rod is broken, the rotation speed of the front rolling wheel 16 is stopped immediately. At this time, the maximum value of F1 is recorded, and the rotation speed of the front rolling wheel 16 is slowly reduced. speed until the pressure value is the average between F1 and Q. At this time, the corresponding rotational speed data of the calendering front wheel 16 is V2. At this time, V2 is greater than the rotational speed V1 corresponding to Q. At such a rotational speed, by comparison, it can not only speed up the calendering speed, but also ensure that the copper rod breakage rate is within a controllable range. Since the copper rods have been screened and classified before this process, the copper rods of the same batch can be calendered at this speed. Taking the average value can ensure the speed while ensuring the controllable range of the breakage rate. This method can be used to find the maximum calendering speed in each subsequent batch of screened and classified copper rods, so as to improve production efficiency.

[0040] b The copper rod coming out of the calendering front wheel 16 after the initial calendering automatically enters the limit sleeve 2, and the limit sleeve 2 is provided with an adjustment module for adjusting the height of the copper rod and an optical rangefinder 12. After the adjustment of the height of the copper rod in the adjustment module, the optical rangefinder 12 will collect the distance data between the limit plate 13 and the upper side wall of the limit sleeve 2, and the collected distance signal is transmitted to the data terminal. The limit sleeve 2 is arranged between the calendering front wheel 16 and the calendering rear wheel 14, and the adjustment module is arranged in the limit sleeve 2. The adjustment module includes a telescopic cylinder 11, a telescopic cylinder 12, and a telescopic cylinder 13. Cylinder 11 is used to adjust the height of the limit plate 13, that is, the distance between the limit plate 13 and the upper side wall of the limit sleeve 2. A rotatable limit column 10 is provided at one end of the limit plate 13 close to the rolling front wheel 16, which is used to quickly guide the copper rod after the initial rolling between the limit plate 13 and the optical rangefinder 12. At this time, the optical rangefinder 12 collects distance data, creates a folder in the data terminal, and pre-sets a correction function in the folder. The collected data is imported into the correction function, and the correction function is only a Y-axis function, Y=y / 2.

[0041] c The two rear rolling wheels 14 will receive the copper rod from the front rolling wheel 16 as the secondary rolling. The two rear rolling wheels 14 are installed together on the movable plate 15, and the movable plate 15 is corrected by the correction module. The copper rod coming out of the above-mentioned limit sleeve will automatically enter between the two rear rolling wheels 14 for secondary rolling after the joint action of the adjustment module, the optical rangefinder 12 and the correction module. The result of the above-mentioned correction function is the center point coordinates of the distance calculated. The correction module controls the movement of the movable plate 15 according to the center point coordinates, and makes the longitudinal coordinates of the center point coordinates between the centers of the two rear rolling wheels 14 the same as the longitudinal coordinates of the center point coordinates of the above-mentioned distance.

[0042] The above steps bc are used to calibrate the moving trajectory of the copper rod after being rolled. The limit sleeve 2 and the limit sleeve 1 7 are both controlled by the telescopic cylinder 2 and are slidably connected to the frame of the equipment to control the positions of the limit sleeve 1 7 and the limit sleeve 2. The control of the limit sleeve 2 and the limit sleeve 1 7 by the frame and the telescopic cylinder 2 belongs to the prior art and is not shown in the figure or described in detail. When the limit plate 13 is in the initial position, the distance from the limit plate 13 to the upper side wall of the limit sleeve 2 is greater than the diameter of the copper rod. The copper rod is bent upward after being rolled. Since the limit column 10 is a cylindrical An arc-shaped surface is provided when in contact with the copper rod and is rotatable, which effectively buffers the extrusion force caused by the movement of the copper rod, and slowly guides the copper rod into the limit sleeve 2 as it is pushed. At this time, the telescopic cylinder 11 is used to control the limit plate 13 to move upward. In the process of moving upward, the copper rod is slowly pressed straight until the distance is slightly larger than the diameter of the copper rod after being rolled, and the movement of the limit plate 13 is stopped. This process can be observed manually with the naked eye or monitored by a camera. The errors caused by these two methods can be automatically corrected by the two rear rolling wheels 14 at the back.

[0043] The time when the limit plate 13 stops moving up is before the copper rod blocks the light of the optical rangefinder 12. When the limit plate 13 stops, the point on the Y axis represented by the distance measured by the optical rangefinder 12 is y1. Substituting y1 into the correction function will obtain the coordinate of the center point of the copper rod on the Y axis. At the same time, the two data terminals send the signal of the Y coordinate to the telescopic cylinder 1. The Y coordinate of the center point between the centers of the two rolling rear wheels 14 is y2. When the telescopic cylinder 1 receives the coordinate, it will control the movement of the movable plate 15 so that y2 is the same as y1, and then stop moving. Then, when the copper rod comes out of the limit sleeve 2, it will automatically enter between the two rolling rear wheels 14, thereby completing the guidance and automatic docking of the copper rod, avoiding manual auxiliary processing with tools such as pliers, improving work efficiency, and reducing the danger of equipment to labor.

[0044] S5, annealing treatment, which at least includes natural cooling and cooling using a cooling medium, and the cooling medium includes water, oil and a special coolant.

[0045] S6, copper wire quality inspection, at least including diameter inspection, shape inspection, surface quality inspection, and conductivity inspection.

[0046] S7, processing the tested copper wire into a copper wire shielding layer, and then manufacturing the copper wire shielded aluminum alloy cable.

[0047] In the present invention, the above processing technology is utilized to improve the rolling efficiency while ensuring that the breakage rate of the copper wire is controllable, and the rolling efficiency is further improved by automatic docking rolling.

[0048] In addition, the above-mentioned equipment all adopts heat insulation treatment, which belongs to the existing technology, and the working principle will not be described in detail.

[0049] refer to Figure 2 A copper wire shielded aluminum alloy cable, comprising a cable 1, an armor layer 3 and an outer sheath 4. The cable 1 at least comprises a conductor core and an insulating layer. The outer layer of the cable 1 is provided with a copper wire shielding layer. The cable is connected in sections. The cable connectors used in the sectioned connection can be purchased on the market. They belong to the prior art and are not described in detail. The space formed between the copper wire shielding layer and the armor layer 3 is filled with a liquid with inert properties. The liquid comprises at least one of pure water, mineral oil and fluorinated liquid. First, the liquid has a better pressure resistance and buffering effect than the plastic protective sheath. Secondly, under special conditions, it is better than For example, when the temperature is high, it can absorb heat to cool down. When the temperature drops in winter, due to the large specific heat capacity, the temperature change is very small. Therefore, in the cold winter, it can maintain a certain temperature to avoid the insulator from breaking, thereby further improving the protection of the internal cable 1. Sealing layers 2 are installed at both ends of the cable to achieve a sealing effect. The material of the sealing layer 2 is rubber, plastic, asbestos and other materials commonly used in industry. A cardboard 5 with high hardness is arranged between the armor layer 3 and the outer sheath 4. The cardboard has movable support, which can effectively avoid the extrusion of the internal structure of the cardboard 5, thereby playing a protective role.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for processing copper wire rolling in a copper wire shielded aluminum alloy cable, characterized in that: The steps include: S1, quality screening and classification of copper rods, quality screening includes physical screening and chemical screening; S2, pre-treating the screened copper rods, wherein the pre-treatment at least includes cleaning the copper rod surface and removing the oxide layer; S3, preheating the pretreated copper rod, i.e., heating it under controlled temperature, so as to adjust the internal molecular structure of the metal, and the heating temperature is 300-500 degrees Celsius; S4, sending the preheated copper rod to the roller of a calender for calendering, wherein the calendering comprises at least the following steps: a. The copper rod is fed along the limiting sleeve 1 (7) into between the two front rolling wheels (16). A high temperature resistant bearing (6) is arranged between the limiting sleeve 1 (7) and the front rolling wheel (16) to maintain their respective stability and not interfere with each other. A sensing module for sensing the thickness change of the copper rod is arranged in the limiting sleeve 1 (7). The sensing module converts the thickness change into pressure change and then into pressure data to be transmitted to the data terminal. A speed measuring module is connected to the rotating shaft of the front rolling wheel (16). The speed measuring module transmits the rotation speed data of the front rolling wheel (16) to the data terminal, and data is recorded corresponding to different rotation speeds and different pressures; b. The copper rod coming out of the front rolling wheel (16) after the initial rolling automatically enters the second limit sleeve. The second limit sleeve is provided with an adjustment module for adjusting the height of the copper rod and an optical distance meter (12). After the adjustment module adjusts the height of the copper rod, the optical distance meter (12) collects the distance data between the limit plate (13) and the upper side wall of the second limit sleeve, and the collected distance signal is transmitted to the data terminal; c. The two rear rolling wheels (14) receive the copper rod from the front rolling wheel (16) as the secondary rolling wheel. The two rear rolling wheels (14) are installed on the movable plate (15) and the movable plate (15) is corrected by the correction module. The copper rod coming out of the limit sleeve will automatically enter between the two rear rolling wheels (14) for secondary rolling through the joint action of the adjustment module, the optical rangefinder (12) and the correction module; S5, annealing treatment, the annealing treatment at least includes natural cooling and cooling using a cooling medium; S6, copper wire quality inspection, at least including diameter inspection, shape inspection, surface quality inspection, and conductivity inspection. S7, processing the tested copper wire into a copper wire shielding layer, and then manufacturing the copper wire shielded aluminum alloy cable.

2. The method for processing copper wire rolling in a copper wire shielded aluminum alloy cable according to claim 1, characterized in that: The sensing module comprises a pressure sensor (9) arranged on the side wall of the limiting sleeve (7), a pressure block (8) and a heat insulating pad installed between the pressure block (8) and the pressure sensor (9). During the rolling process, the unrolled portion of the copper rod will expand and thicken as the internal molecules move, squeezing the pressure block (8). The pressure generated will be received by the pressure sensor (9) and transmitted to the data terminal. Database 1 and database 2 are established in the data terminal. A threshold is set between database 1 and database 2, and data exceeding the threshold enters database 2.

3. The method for processing copper wire rolling in a copper wire shielded aluminum alloy cable according to claim 2, characterized in that: Database three is established in the data terminal, and the speed data collected in the speed measurement module enters database three and keeps correlation with database one at all times.

4. The method for processing copper wire rolling in a copper wire shielded aluminum alloy cable according to claim 3, characterized in that: The second limiting sleeve is arranged between the front rolling wheel (16) and the rear rolling wheel (14), and the adjustment module is arranged in the second limiting sleeve. The adjustment module comprises a telescopic cylinder (11), and the telescopic cylinder (11) is used to adjust the height of the limiting plate (13), that is, the distance between the limiting plate (13) and the upper side wall of the second limiting sleeve. The limiting plate (13) is provided with a rotatable limiting column (10) at one end close to the front rolling wheel (16) for quickly introducing the copper rod after the initial rolling into the space between the limiting plate (13) and the optical distance meter (12). At this time, the optical distance meter (12) collects distance data, creates a folder in the data terminal, and pre-sets a correction function in the folder. The collected data is introduced into the correction function.

5. The method for processing copper wire rolling in a copper wire shielded aluminum alloy cable according to claim 4, characterized in that: The result of the correction function is to calculate the center point coordinates of the distance. The correction module controls the movement of the movable plate (15) according to the center point coordinates, and makes the longitudinal coordinates of the center point coordinates between the centers of the two rear rolling wheels (14) the same as the longitudinal coordinates of the center point coordinates of the distance.

6. A copper wire shielded aluminum alloy cable according to claim 5, comprising a cable (1), an armor layer (3) and an outer sheath (4), wherein the cable (1) comprises at least a conductor core and an insulating layer, and is characterized in that: The outer layer of the cable (1) is provided with a copper wire shielding layer, the cable is connected in sections, the space formed between the copper wire shielding layer and the armor layer (3) is filled with a liquid with inert properties, and sealing layers (2) are installed at both ends of the cable.

7. The copper wire shielded aluminum alloy cable according to claim 6, characterized in that: The liquid includes at least one of pure water, mineral oil and fluorinated liquid.

8. The copper wire shielded aluminum alloy cable according to claim 7, characterized in that: A paperboard (5) with high hardness is arranged between the armor layer (3) and the outer sheath (4).

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