Subzero treatment method of contact wire

Abstract

The invention discloses a subzero treatment method of a contact line, which not only can be suitable for subzero treatment of different contact lines, but also can greatly improve the subzero treatment efficiency of the contact line. The method is characterized in that the contact wire is placed in a continuous subzero treatment device to be subjected to subzero treatment for set times, and the set times are larger than or equal to 1; then the contact wire subjected to subzero treatment for set times is wound and reeled through a take-up machine; wherein the single-time subzero treatment comprises the following steps: S1, carrying out variable-temperature subzero treatment on the contact wire through a variable-temperature device; s2, quickly heating the contact line to room temperature through spraying liquid in a spraying box; and S3, driving the contact line to pass through a drying device for drying treatment.

Description

Technical Field

[0001] The invention relates to the technical field of cryogenic treatment of contact wires, and in particular to a cryogenic treatment method for contact wires. Background Art

[0002] In recent years, with the development of electrified railways in the direction of high speed, energy saving and systematic development, its construction area has gradually extended to areas with complex topography and harsh environment such as Yanbian and Plateau. The speed increase of trains and the harsh environment have put forward higher requirements on the electrical and mechanical properties of contact wires used in the contact network of electrified railways. The conventional contact wire preparation method can no longer meet the requirements. Therefore, on the basis of the existing technology, a cryogenic treatment method is used to make the contact wire achieve higher performance. At present, there is no case of using a cryogenic treatment method to prepare contact wires in the industry. The general cryogenic treatment method is to perform a cryogenic treatment on a certain size of products, parts, tooling, etc. in a closed warehouse of a certain size, then take them out and perform a designed number of cryogenic treatments. If the above method is used to perform cryogenic treatment on long-length and large-tonnage contact wires, the closed warehouse needs to have sufficient space, and the amount of cryogenic medium is large, the cost is high, and the process of performing multiple cryogenic treatments at the same time is cumbersome and complicated, and the efficiency of cryogenic treatment is low. Therefore, it is urgent to develop a cryogenic treatment method for contact wires, so that it can improve the performance of contact wires while achieving efficient and low-cost cryogenic treatment of long-length and large-tonnage contact wires. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a cryogenic treatment method for a contact wire, so that it can improve the performance of the contact wire while achieving efficient and low-cost cryogenic treatment of long-length and large-tonnage contact wires.

[0004] A cryogenic treatment method for a contact wire, characterized in that the contact wire is placed in a continuous cryogenic treatment device for a set number of cryogenic treatments, wherein the set number of times is greater than or equal to 1; then the contact wire that has been cryogenically treated the set number of times is wound up by a wire take-up machine;

[0005] The single cryogenic treatment includes the following steps:

[0006] S1. The contact wire is subjected to temperature-changing cryogenic treatment through a temperature-changing device;

[0007] S2, the contact line is quickly heated to room temperature by the spray liquid in the spray box;

[0008] S3, driving the contact wire to pass through a drying device for drying.

[0009] It is further characterized by:

[0010] In step S1, the contact wire passes through a number of temperature adjustment chambers arranged in a temperature-decreasing trend in sequence, and finally enters a cryogenic treatment chamber for cryogenic treatment to complete the variable temperature cryogenic treatment;

[0011] In step S1, the number of cryogenic treatment chambers in each group of temperature changing devices is one;

[0012] A cryogenic medium that does not react with the contact wire is used for variable temperature cryogenic treatment. The cryogenic medium is vaporized into ultracold gas molecules and then passed into the spiral cooling tube in the temperature regulating chamber to cool the contact wire at its center. The cryogenic medium is vaporized into ultracold gas molecules and then passed into the cryogenic treatment chamber to cryogenically treat the contact wire located therein.

[0013] A transversely arranged guide roller is provided in the cryogenic treatment chamber, and a concave spiral groove is provided on the surface of the guide roller. The contact wire is spirally wound along the concave spiral groove on the surface of the guide roller and then passes through the outlet end of the cryogenic treatment chamber. The cryogenic medium performs a cryogenic operation on the contact wire through the surface of the contact wire, and the single cryogenic time is controlled by three factors: the wire taking-up speed of the wire take-up machine, the number of turns of the wire material wound on the guide roller in the cryogenic treatment chamber, and the outer diameter size of the guide roller;

[0014] The contact wire is cryogenically treated in a single cryogenic treatment chamber at a temperature of -80°C to -190°C for 5 to 30 minutes;

[0015] During the cryogenic treatment of the contact line, the cryogenic medium is recycled and reused through a circulating refrigeration system.

[0016] The spray liquid is circulated through the spray circulation system. The spray liquid is sprayed out from the spray head in the spray box, used for spraying and heating the contact line, and then flows into the spray liquid storage tank; the liquefied water in the temperature control chamber is collected in the spray liquid storage tank for recycling.

[0017] After the contact wire is formed, the online cryogenic treatment of the contact wire by the present invention can not only increase the dislocations in the contact wire to form dislocation rings, increase the number of twins and change the morphology, increase the precipitated phases, and reduce the size and distribute them evenly; it can also eliminate defects such as pores and holes inside the contact wire and improve the density of the contact wire; in addition, the stability of the organization, performance, size, etc. of the contact wire during use, especially in extreme environments, is improved; in short, cryogenic treatment changes the microstructure of the contact wire, eliminates defects, and comprehensively improves its strength, hardness, wear resistance, corrosion resistance, arc erosion resistance, stability, etc., and has high electrical conductivity, so that it still has a long service life in extreme environments.

[0018] The present invention performs continuous cryogenic treatment on the contact wire, and the cryogenic treatment method has the following advantages:

[0019] 1. The present invention is provided with a plurality of independent temperature adjustment chambers and cryogenic treatment chambers, each of which is provided with an independent temperature control system. By controlling the temperature of each temperature adjustment chamber and cryogenic treatment chamber respectively, the contact wire is gradually brought from room temperature to a low temperature, ultra-low temperature, and cryogenic treatment temperature environment, thereby realizing online temperature change treatment of the contact wire and effectively avoiding defects such as brittle cracking of the contact wire caused by a sudden drop in temperature;

[0020] 2. The present invention can be adjusted as follows according to the performance requirements of the product: (1) by increasing or decreasing the number of temperature-adjusting chambers and cryogenic treatment chambers, the purpose of slow cooling and repeated cryogenic treatment can be achieved; (2) by setting the temperature of each temperature-adjusting chamber in the temperature-changing device to achieve multi-mode temperature-changing treatment; (3) the cryogenic treatment time can be adjusted by the wire-receiving speed, the size of the temperature-adjusting chamber, the number of windings of the contact wire in the cryogenic treatment chamber, and the outer diameter of the guide roller;

[0021] The invention has extremely high flexibility and adaptability and can meet the cryogenic treatment requirements of various long-length wire products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a specific embodiment of the continuous cryogenic device used in the present invention;

[0023] Figure 2 A three-dimensional schematic diagram of a spiral cooling tube spiral coil used in the present invention;

[0024] Figure 3 A schematic front view of the guide roller used in the present invention;

[0025] Figure 4 is a cross section of the contact wire of Embodiment 1 corresponding to the present invention;

[0026] The names corresponding to the serial numbers in the figure are as follows:

[0027] Temperature changing device 100, circulating refrigeration system 200, circulating spraying system 300, temperature regulating chamber group 400, contact line 500;

[0028] Cryogenic medium storage tank 1, transformer 2, first safety valve 3, non-return valve 4, cryogenic treatment chamber 5, evaporator 6, temperature control and display device 7, temperature detection device 8, temperature adjustment chamber 9, circulating spray box 10, guide roller 11, concave spiral groove 111, ventilation hole 112, drying device 12, wire take-up machine 13, spray head 14, reflux pipe 15, spray box temperature controller 16, pump 17, heating and insulation device 18, spray liquid storage tank 19, condensate water pipe 20, spiral cooling pipe 21, collection tank 22, pressure gauge 23, condensation filter 24, compressor 25, second safety valve 26, second non-return valve 27. DETAILED DESCRIPTION

[0029] A cryogenic treatment method for a contact wire comprises placing the contact wire in a continuous cryogenic treatment device for cryogenic treatment for a set number of times, wherein the set number of times is greater than or equal to 1; then the contact wire after the cryogenic treatment for the set number of times is wound up and coiled by a wire take-up machine.

[0030] The steps of a single cryogenic treatment are as follows:

[0031] S1. The contact wire is subjected to variable temperature cryogenic treatment through a temperature variable device. Each set of temperature variable devices includes a plurality of temperature regulating chambers and a cryogenic treatment chamber. The contact wire passes through a plurality of temperature regulating chambers arranged in a temperature decreasing trend in sequence, and finally enters the cryogenic treatment chamber for cryogenic treatment, thereby completing the variable temperature cryogenic treatment;

[0032] S2, the contact line is quickly heated to room temperature by the spray liquid in the spray box;

[0033] S3, driving the contact wire to pass through a drying device for drying.

[0034] In specific implementation, each group of temperature changing devices includes at least one group of temperature regulating chambers and one cryogenic treatment chamber, wherein a plurality of temperature regulating chambers are arranged in sequence in the temperature regulating chamber group. By controlling the temperatures of the plurality of temperature regulating chambers and the cryogenic treatment chamber respectively, a certain temperature reduction trend is exhibited until the cryogenic treatment temperature is reached.

[0035] It uses a cryogenic medium that does not react with the contact wire for variable temperature cryogenic treatment. The cryogenic medium is vaporized into ultra-cold gas molecules and then passed into the spiral cooling tube in the temperature regulating chamber to cool the contact wire at its center. The cryogenic medium is vaporized into ultra-cold gas molecules and then passed into the cryogenic treatment chamber to cryogenically treat the contact wire located therein, effectively reducing the thermal shock of the cryogenic medium on the contact wire and avoiding crack defects caused by sudden temperature changes in the contact wire. At the same time, the spiral cooling tube in the temperature regulating chamber can quickly reach the set temperature, and the temperature distribution is uniform.

[0036] A cryogenic medium such as liquid nitrogen or liquid argon is introduced into the temperature adjustment chamber and the cryogenic treatment chamber. A transversely arranged guide roller is provided in the cryogenic treatment chamber. The surface of the guide roller is provided with an inwardly concave spiral groove. The contact line is spirally wound along the inwardly concave spiral groove on the surface of the guide roller and then passes through the outlet end of the cryogenic treatment chamber.

[0037] The cryogenic treatment temperature of the contact wire is -80℃~-190℃, and the time is 5-30min;

[0038] When the contact line is subjected to cryogenic treatment, the cryogenic medium is recycled and reused through the circulating refrigeration system;

[0039] The spray liquid is recycled through the spray circulation system. The spray liquid is sprayed from the spray head in the spray box, used for spraying and heating the contact line, and then flows into the spray liquid storage tank; the liquefied water in the temperature control chamber is also collected in the spray liquid storage tank for recycling.

[0040] The continuous cryogenic device used in the specific implementation is shown in Figure 1-Figure 3 , which only includes a set of temperature changing devices 100, and the continuous cryogenic device also includes a circulating refrigeration system 200, a circulating spraying system 300, a drying device 12 and a wire taking-up device;

[0041] The temperature changing device 100 is composed of a group of temperature-adjusting chambers 400 and a cryogenic treatment chamber 5. Each group of temperature-adjusting chambers 400 includes at least two independent temperature-adjusting chambers 9. The temperature-adjusting chambers 9 in each group of temperature-adjusting chambers 400 are closely connected and only have a communicating contact line flow port. The temperature-adjusting chamber 9 at the end of each group of temperature-adjusting chambers 400 is closely connected to the input end of the cryogenic treatment chamber 5.

[0042] The circulating refrigeration system 200 includes a cryogenic medium storage tank 1, a transformer 2, an evaporator 6, a condensation filter 24, a compressor 23, a cryogenic medium collection tank 22 and a number of pipelines;

[0043] The circulating spray system 300 includes a spray box 10, a spray liquid storage box 19, and a plurality of corresponding pipes. A plurality of groups of spray heads 14 are arranged in the spray box 10; the spray liquid storage box 19 is connected to each group of spray heads 14 through pipes. The spray heads 14 are located above the inside of the spray box 10, and are arranged in parallel and spaced apart along the direction of the contact line and spray downwards;

[0044] The wire taking-up device is specifically a wire taking-up machine 13;

[0045] A spray box 10 is fixedly arranged behind the cryogenic treatment chamber 5 at the end of the temperature changing device 100, a drying device 12 is arranged at the output port of the spray box 10, and a wire take-up machine 13 is arranged behind the drying device 12;

[0046] A spiral cooling tube 21 is provided in each temperature regulating chamber 9, the central part of the spiral cooling tube 21 is used to penetrate the contact line, the upper input end of the spiral cooling tube 21 is introduced into the cryogenic medium, and the lower output end of the spiral cooling tube 21 is externally connected to the inlet of the condensation filter 24 through the first reflux pipeline;

[0047] A cryogenic medium is introduced into each cryogenic treatment chamber 5, and the cryogenic medium outlet at the bottom of the cryogenic treatment chamber 5 is connected to the inlet of the condensation filter 24 through the corresponding second reflux pipe; a transversely arranged guide roller 11 is provided in the cryogenic treatment chamber 5, and a concave spiral groove 111 is provided on the surface of the guide roller 11. The contact wire 500 is spirally wound along the concave spiral groove 111 on the surface of the guide roller 11 and then passes through the outlet end of the cryogenic treatment chamber 5, and the cryogenic medium performs a cryogenic operation on the contact wire 500 through the surface of the contact wire 500;

[0048] The output end of the cryogenic medium storage tank 1 is connected to the transformer 2, the first safety valve 3, the first non-return valve 4 and the evaporator 6 in sequence. The cryogenic medium enters the evaporator 6 and vaporizes. The vaporized cryogenic medium flows into the spiral cooling pipe 21 and the cryogenic treatment chamber 5 in each temperature adjustment chamber 9 according to the set multiple groups of branch pipes. The temperature adjustment chamber 9 and the cryogenic treatment chamber 5 are both provided with a temperature control and display device 7 and a temperature detection device 8, wherein the temperature control and display device 7 is connected to the branch pipes and is provided with a cryogenic medium flow control valve and a temperature display module. The temperature display module is used to compare the difference between the chamber temperature measured by the temperature detection device 8 and the set temperature in real time, and control the cryogenic medium flow entering the corresponding chamber through the flow control valve according to the difference;

[0049] The corresponding outlet of the condensation filter 24 is connected to the cryogenic medium collection tank 16 after passing through the compressor 25 .

[0050] In specific implementation, the two ends of the guide roller 11 in the length direction are limited by corresponding bearings and rotated to work, and the guide roller 11 is an axially hollow structure, and a plurality of through ventilation holes 112 are provided on the surface. The provision of the ventilation holes 112 is conducive to the rapid and uniform cryogenic treatment of the contact line 500;

[0051] The bottom of the spray box 10 is a first funnel slope, the bottom of the first funnel slope is connected to a return pipe 15, and the return pipe 15 is connected to a filter and a spray liquid storage tank 19 in sequence to realize the recovery of the spray liquid;

[0052] The bottom of each temperature adjustment chamber 9 is a second funnel slope, the bottom of the second funnel slope is connected to the condensate return flow channel 20, and the condensate return flow channel 20 is connected to the spray liquid storage tank 19.

[0053] The cryogenic medium collecting tank is connected to the cryogenic medium storage tank through a pipeline. The cryogenic medium collecting tank and the cryogenic medium storage tank are the same tank body, so that the cryogenic medium can be circulated.

[0054] In a specific embodiment, the temperature changing device 100 is composed of a temperature regulating chamber group 400 and a cryogenic treatment chamber 5. The temperature regulating chamber group 400 includes four independent temperature regulating chambers 9, and the four temperature regulating chambers 9 are closely fitted and arranged in sequence.

[0055] The condensate return flow channels 20 of the four temperature adjustment bins 9 form a condensate return flow channel arranged obliquely downward, and the condensate return flow channel 20 is connected to the spray liquid storage tank 19;

[0056] A heating and heat preservation device 18 is provided inside the spray liquid storage tank 19, and a temperature controller 16 is provided outside the spray liquid storage tank 19;

[0057] The spray liquid output pipeline is also provided with a filter, a pressure gauge, a pump 17 and a one-way valve;

[0058] All the first reflux pipes and the second reflux pipes are refluxed to the reflux main pipe, connected to the second safety valve 26 and the second check valve 27, and then lead to the inlet of the condensation filter 24.

[0059] In the specific embodiment, pressure gauges 23 are provided on the evaporator 6 and the compressor 25 .

[0060] Example 1: The material of the contact wire is prepared by melting and casting, continuous extrusion, cold deformation, aging treatment, and drawing to obtain the following components according to the mass percentage: 0.6wt% Cr, 0.11wt% Zr, 0.05wt% Sn, and the remainder Cu and unavoidable impurities, and the total mass percentage of each component is 100%. Figure 4 The cross-sectional area is 150 mm 2 The contact line is then cryogenically treated as follows:

[0061] One end of the contact wire is connected to a chain, which passes through a plurality of temperature-adjusting chambers 9, is wound several times on a guide roller 11 in a cryogenic treatment chamber 5, and is then connected to a wire take-up machine 13 through a circulating spray box 10 and a drying device 12.

[0062] Turn on the spray box temperature controller 16 to start the heating and heat preservation device 18 to work. When it reaches the set temperature of 20°C±1°C and stabilizes, turn on the pump 17 and the spray liquid is sprayed through the spray head 14.

[0063] Turn on the temperature control and display device 7 and the temperature detection device 8 on each temperature adjustment chamber 9 and the cryogenic treatment chamber, and set the temperature of each temperature control and display device 7 to -10°C, -40°C, -70°C, -90°C, and -100°C from left to right, with a temperature error of ±2°C.

[0064] Turn on the switch of the cryogenic medium storage tank 1, set the transformer 2, open the first safety valve 3 and the evaporator 6, and the cryogenic medium enters the evaporator 6 from the cryogenic medium storage tank 1 through the transformer 2, the first safety valve 3, the one-way valve 4, and then the cryogenic medium vaporizes. After the cryogenic medium vaporizes, it flows through the pipeline, the temperature control and display device 7, and flows from the upper end of the spiral cooling pipe and the entrance of the cryogenic treatment chamber. The temperature-adjusting chamber and the cryogenic treatment chamber are cooled accordingly. The temperature detection device 8 detects the temperature of each temperature-adjusting chamber and the cryogenic treatment chamber in real time. When the set temperature is reached, the temperature control and display device 7 stops inputting the cryogenic medium through the flow controller. When the temperature detected by the temperature detection device 8 is higher than the set temperature, the cryogenic temperature control and display device 7 inputs the vaporized cryogenic medium through the flow controller. The above process is repeated to keep each temperature-adjusting chamber and the cryogenic treatment chamber at the set temperature.

[0065] The safety valve, condensation filter 24, compressor 25 and collection tank 22 on the cryogenic medium recovery pipeline are opened to recover the cryogenic medium.

[0066] The wire take-up machine 13 is turned on, and the rotation of the wire drum drives the chain to rotate, so that the contact wire passes through four temperature adjustment chambers 9 in sequence and reaches the deep cold treatment chamber 5, in which it is deep cold treated. The time of deep cold treatment is adjusted by the wire drum take-up speed and the number of contact wire winding turns on the guide roller. The deep cold time of each part of the contact wire is 30 minutes. After that, it enters the spray box 10, and the spray liquid fully contacts the contact wire, so that the contact wire is quickly heated to room temperature. After being dried by the drying device 12, it is wound on the wire drum.

[0067] During the cryogenic treatment process, the circulating refrigeration system and the circulating spraying system continue to work. The cryogenic medium flows out from the lower end of each spiral cooling tube and the cryogenic treatment chamber, and is collected in the condensation filter 24 for filtration, and then compressed into liquid by the compressor 25, and collected in the collection tank 22 for secondary recycling. The spray liquid is sprayed from the multiple spray heads 14 inside the spray box 10, and after contacting the contact line, it enters the spray liquid storage tank 19 through the funnel area and the return pipe 15 below the spray box 10. At the same time, the condensed water flows into the spray liquid storage tank 19 from the pipe 20, and is recycled in this way.

[0068] After the wire is taken up, turn off the wire taking-up device, drying device, related switches of the circulating refrigeration system, temperature variable device switch, and circulating spray system switch.

[0069] In Comparative Example 1, Example 1 is not subjected to cryogenic treatment, and the remaining steps are the same as those of Example 1.

[0070] In Comparative Example 2, Example 1 is directly placed in a cryogenic treatment chamber at -190°C for cryogenic treatment, and the cryogenic time of each contact line is 30 minutes.

[0071] The performance test of the copper alloy contact wires prepared in Example 1 and Comparative Examples 1 and 2 was carried out. The cross-sectional dimensions of the contact wires were the same. Figure 3 The main electromechanical performance test results are as follows

[0072]

[0073] It can be seen from the table that the tensile strength, wear resistance and arc erosion resistance of the copper alloy contact wire prepared by Example 1 and Comparative Example 2 are relatively high, but the repeated bending performance of Comparative Example 2 is poor, and the surface quality is unqualified; the copper alloy contact wire prepared by Comparative Example 1 has low tensile strength and softening rate, and its wear resistance and arc erosion resistance are worse than those of Example 1.

[0074] After the contact wire is formed, it is subjected to a single or set number of online variable temperature cryogenic treatments to gradually cool it down. This can not only increase the number of dislocations in the contact wire to form dislocation rings, increase the number of twins, and change the morphology, increase the number of precipitated phases, and make them smaller and more evenly distributed; it can also eliminate defects such as pores and holes inside the contact wire and improve the density of the contact wire; in addition, it improves the stability of the organization, performance, and size of the contact wire during use, especially in extreme environments. In summary, cryogenic treatment changes the microstructure of the contact wire, eliminates defects, and comprehensively improves its strength, hardness, wear resistance, corrosion resistance, arc erosion resistance, and stability. It also has high electrical conductivity, which enables it to have a long service life in extreme environments.

[0075] The present application can make the following adjustments according to the performance requirements of the product: (1) by increasing or decreasing the number of temperature-adjusting bins and cryogenic treatment bins, the purpose of slow cooling and repeated cryogenic treatment can be achieved; (2) by setting the temperature of each temperature-adjusting bin in the temperature-changing device to achieve multi-mode temperature-changing treatment; (3) the cryogenic treatment time can be adjusted by the wire-winding speed, the size of the temperature-adjusting bin, the winding condition of the contact wire in the cryogenic treatment bin, the outer diameter of the guide roller, etc. The present invention has extremely high flexibility and adaptability, and is not only applicable to the cryogenic treatment requirements of contact wires, but also to the cryogenic treatment requirements of other metal wires;

[0076] A guide roller is arranged in the cryogenic treatment chamber, so that the contact wire is wound on it for cryogenic treatment, which not only greatly expands the cryogenic treatment time range, makes the applicability of the continuous cryogenic device wider, but also saves the equipment space;

[0077] By introducing cooling medium into the spiral cooling tube, the contact line at the core is subjected to indirect cryogenic treatment, which has the following advantages: (1) the direct thermal shock of the cryogenic medium on the contact line can be effectively reduced, which not only further avoids the occurrence of defects such as cracks, but also reduces the erosion of the surface of the contact line by the cryogenic medium and its impurities, thereby ensuring the surface quality of the product; (2) the spiral cooling tube can quickly reach the set temperature, and the temperature distribution is uniform, which is conducive to rapid and high-quality cryogenic treatment; (3) the efficient recovery and reuse of the cryogenic medium is realized;

[0078] The bottom of each temperature-adjusting chamber and cryogenic treatment chamber is funnel-shaped, and the condensate recovery pipes are tightly connected and angled downward as a whole, which is convenient for condensate recovery and can effectively prevent gas circulation between temperature-adjusting chambers;

[0079] During operation, the continuous cryogenic device has a complete collection and circulation system, which can effectively recycle and reuse cryogenic media, spray liquids and other liquids, reducing production costs, avoiding the leakage of harmful substances, and achieving the goals of energy saving and environmental protection.

[0080] At least one group of temperature-changing devices is arranged according to the demand of the contact line, and each group of temperature-changing devices includes several groups of independent temperature-adjusting chambers and one group of cryogenic treatment chambers. Each temperature-adjusting chamber is provided with an independent temperature control system. By controlling the temperature of each temperature-adjusting chamber and the temperature of the cryogenic treatment chamber respectively, the purpose of gradually changing the contact line from room temperature to low temperature, ultra-low temperature, and finally to the cryogenic treatment temperature is achieved. It realizes online temperature-changing treatment of the contact line and effectively avoids defects such as brittle cracking of the contact line caused by sudden temperature drop. Moreover, since a transversely arranged guide roller is arranged in the cryogenic treatment chamber, the surface of the guide roller is provided with a concave spiral groove, and the contact wire is spirally wound along the concave spiral groove on the surface of the guide roller and then passes through the outlet end of the cryogenic treatment chamber. The single cryogenic time is controlled by three factors: the wire-winding speed of the wire-winding machine, the number of turns of the wire wound on the guide roller in the cryogenic treatment chamber, and the outer diameter size of the guide roller.

[0081] In summary, a cryogenic treatment method for a contact wire can not only produce a high-performance contact wire, but also has low production cost and high efficiency. In addition, the present application is applicable to wires other than contact wires and has a wide range of applicability.

[0082] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0083] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cryogenic treatment method for a contact wire, It is characterized in that The contact wire is placed in a continuous cryogenic treatment device for a set number of cryogenic treatments, wherein the set number of treatments is greater than or equal to 1; the contact wire that has undergone the set number of cryogenic treatments is then wound up by a wire take-up machine; The single cryogenic treatment includes the following steps: S1. The contact wire is subjected to temperature-changing cryogenic treatment through a temperature-changing device; S2, the contact line is quickly heated to room temperature by the spray liquid in the spray box; S3, driving the contact wire to pass through a drying device for drying.

2. A cryogenic treatment method for a contact wire according to claim 1, Features: In step S1, the contact wire passes through a number of temperature regulating chambers arranged in a temperature decreasing trend in sequence, and finally enters a cryogenic treatment chamber for cryogenic treatment, thereby completing the variable temperature cryogenic treatment.

3. A cryogenic treatment method for a contact wire according to claim 2, Features: It uses a cryogenic medium that does not react with the contact wire to perform variable temperature cryogenic treatment. The cryogenic medium is vaporized into ultra-cold gas molecules and then passed into a spiral cooling tube in a temperature control chamber to cool the contact wire at its center. The cryogenic medium is vaporized into ultra-cold gas molecules and then passed into a cryogenic treatment chamber to perform cryogenic treatment on the contact wire inside.

4. A cryogenic treatment method for a contact wire according to claim 3, Features: A transversely arranged guide roller is provided in the cryogenic treatment chamber, and a concave spiral groove is provided on the surface of the guide roller. The contact wire is spirally wound along the concave spiral groove on the surface of the guide roller and then passes through the outlet end of the cryogenic treatment chamber. The cryogenic medium performs a cryogenic operation on the contact wire through the surface of the contact wire, and the single cryogenic time is controlled by three factors: the wire taking-up speed of the wire taking-up machine, the number of turns of the wire wound around the guide roller in the cryogenic treatment chamber, and the outer diameter size of the guide roller.

5. A cryogenic treatment method for a contact wire according to claim 2, Features: The contact wire is cryogenically treated in a single cryogenic treatment chamber at a temperature of -80°C to -190°C for 5 to 30 minutes.

6. A cryogenic treatment method for a contact wire according to claim 1, Features: During the cryogenic treatment of the contact line, the cryogenic medium is recycled and reused through a circulating refrigeration system.

7. A cryogenic treatment method for a contact wire according to claim 1, Features: The spray liquid is circulated through the spray circulation system. The spray liquid is sprayed out from the spray head in the spray box, used for spraying and heating the contact line, and then flows into the spray liquid storage tank; the liquefied water in the temperature control chamber is collected in the spray liquid storage tank for recycling.

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