A low-loss millimeter-wave test cable manufacturing process and pretreatment equipment

Abstract

This application relates to the field of cable manufacturing processes, and in particular to a manufacturing process and pretreatment equipment for low-loss millimeter-wave test cables. To address the problem of unstable dielectric constant and high high-frequency signal loss caused by interlayer gaps, the steps are as follows: First, conductor pretreatment, selecting silver-plated copper conductors, cleaning and drying them in pretreatment equipment; Second, PTFE insulation layer wrapping and heat setting, using PTFE film to wrap the pretreated silver-plated copper conductor in layers, followed by high-temperature heat setting in a heat setting furnace; Third, wrapping silver-plated copper flat strips around the PTFE insulation layer; Fourth, sequentially wrapping composite aluminum foil and PTFE film around the silver-plated copper flat strips to form a stabilizing layer; Fifth, preparation of the braided shielding layer. This application has the dual advantages of achieving high-frequency low loss and high structural stability, solving the problems of high high-frequency signal loss and poor structural stability in existing millimeter-wave test cables.

Description

Technical Field

[0001] This application relates to the field of cable manufacturing processes, and in particular to a manufacturing process and pretreatment equipment for low-loss millimeter-wave test cables. Background Technology

[0002] Low-loss millimeter-wave test cables are key components of radio frequency, microwave, and millimeter-wave test systems, and must possess characteristics such as high frequency, low loss, stable structure, and high dimensional accuracy.

[0003] However, the insulation layer of traditional low-loss millimeter-wave test cables is mostly made by single wrapping or extrusion molding, which is prone to unstable dielectric constant due to interlayer gaps, resulting in high-frequency signal loss. In addition, the outer conductor and shielding layer structure is simple, with weak anti-interference ability and is prone to structural loosening after long-term use. At the same time, the sheath cooling is mostly done by a single cold water tank, which is prone to sheath cracking or internal stress residue due to excessive temperature difference, affecting the overall stability of the cable and making it difficult to meet the requirements of high-precision testing.

[0004] Furthermore, in the manufacturing of millimeter-wave test cables, pretreatment of the silver-plated copper conductor is necessary to ensure extremely high adhesion between the subsequent silver plating layer and the copper substrate. Because the cable undergoes various mechanical stresses during processing and use, such as wrapping, heat setting, and bending, insufficient plating adhesion will directly lead to blistering, peeling, or other defects, severely affecting the cable's signal transmission performance and stability. In particular, oil, oxides, and other impurities on the copper conductor surface hinder the direct growth of the silver layer, directly causing reduced adhesion, rough plating, or pinhole defects. Summary of the Invention

[0005] To address the problem of unstable dielectric constant and high high-frequency signal loss caused by interlayer gaps, this application provides a low-loss millimeter-wave test cable manufacturing process and pretreatment equipment.

[0006] The manufacturing process for a low-loss millimeter-wave test cable provided in this application adopts the following technical solution:

[0007] A manufacturing process for a low-loss millimeter-wave test cable includes the following steps:

[0008] The first step is conductor pretreatment, which involves selecting silver-plated copper conductors, cleaning them with pretreatment equipment, and then drying them.

[0009] The second step is PTFE insulation layer wrapping and heat setting. PTFE film is used to wrap the pre-treated silver-plated copper conductor in layers. After wrapping, it is sent to a heat setting furnace for high-temperature heat setting.

[0010] The third step is to wrap silver-plated copper flat strip around the PTFE insulation layer;

[0011] The fourth step is to wrap a composite aluminum foil and a PTFE film around the silver-plated copper flat strip in sequence to form a stabilizing layer;

[0012] The fifth step is to prepare the shielding layer by twisting multiple silver-plated copper wires together and weaving them outside the stabilizing layer to form a shielding layer.

[0013] The sixth step is FEP sheath extrusion and gradient cooling. FEP raw material is extruded by a single screw extruder to coat the braided shielding layer. After extrusion, the cable is first sent to a hot water tank for pre-cooling, and then transferred to a cold water tank to cool to room temperature.

[0014] This application provides a pretreatment device for the production of low-loss millimeter-wave test cables, comprising:

[0015] The frame has positioning frames fixedly connected to both ends. Each positioning frame is equipped with a lead wire assembly at its top. One lead wire assembly is used to release the silver-plated copper conductor to be cleaned and dried, and the other lead wire assembly is used to wind up the silver-plated copper conductor after cleaning and drying.

[0016] An ultrasonic cleaner, wherein the ultrasonic cleaner is embedded at the top of a frame, and a wire assembly is provided at the top of the frame;

[0017] A drying assembly is mounted on the top of the frame away from the ultrasonic cleaner, and a wire assembly is used to pass a silver-plated copper conductor between the wire assembly, the ultrasonic cleaner, and the drying assembly.

[0018] Two trays are fixedly connected to both ends of the frame, and a wire supply assembly is assembled between the two trays. The wire supply assembly is used to cooperate with the lead assembly to form the initial setup of the silver-plated copper conductor to be processed.

[0019] Optionally, the lead assembly includes:

[0020] The mounting shaft is rotatably connected to the top of the positioning frame, and a drive motor is fixedly connected to the top of the positioning frame. The output end of the drive motor is also fixedly connected to the mounting shaft.

[0021] A reel is sleeved on the outside of a mounting shaft. A threaded rod is fixedly connected to the end of the mounting shaft away from the drive motor, and a retaining plate is threadedly connected to the outside of the threaded rod.

[0022] Optionally, the conductor assembly includes:

[0023] Multiple support seats are fixedly connected to the top of the frame, and a support roller A is rotatably connected to the top of each support seat;

[0024] A limiting frame is fixedly connected to the top of the machine frame. A limiting rod is vertically slidably connected to the top of the limiting frame. An adjusting plate is fixedly connected to the bottom of the limiting rod. A guide groove is provided in the middle of the adjusting plate.

[0025] A guide plate is fixedly connected to the bottom of an adjusting plate. A support frame is fixedly connected to the bottom of the guide plate, and multiple support rollers B are rotatably connected to one side of the support frame.

[0026] Optionally, the drying assembly includes:

[0027] A drying oven is fixedly connected to the top of the frame away from the ultrasonic cleaner. A diversion pipe is fixedly connected to the top of the interior of the drying oven, and multiple drying branch pipes are fixedly connected to both sides of the diversion pipe.

[0028] An air supply fan is fixedly connected to the top of the drying box. A transmission pipe is fixedly connected to the output end of the air supply fan. A heating box is fixedly connected to the top of the drying box. The end of the transmission pipe away from the air supply fan is also connected to the heating box.

[0029] An electric heating wire is fixedly connected inside the heating chamber. A gas supply pipe is fixedly connected to the top of one side of the heating chamber, and the end of the gas supply pipe away from the heating chamber is also connected to a distribution pipe.

[0030] Two sealing doors are vertically slidably connected to both ends of the drying oven. An avoidance groove is provided in the middle of the sealing door, and a heat insulation curtain is fixedly connected to the avoidance groove.

[0031] A transmission frame is fixedly connected to the top of the drying oven. A hydraulic cylinder is fixedly connected to the top of the transmission frame. A displacement plate is fixedly connected to the output end of the hydraulic cylinder, and the two ends of the displacement plate are fixedly connected to two sealing doors respectively.

[0032] A transmission assembly is assembled between one of the blocking doors and the adjusting plate. The transmission assembly is used to cooperate with the adjusting plate to change the vertical position of the support frame.

[0033] Optionally, the transmission assembly includes:

[0034] An extension plate is fixedly connected to the top of one of the sealing doors. A transmission rod is fixedly connected to the end of the extension plate away from the sealing door. A linkage shaft is rotatably connected to the top of the frame near the ultrasonic cleaner. A push plate is fixedly connected to one end of the linkage shaft. A push rod is fixedly connected to the end of the push plate away from the linkage shaft. The push rod is also movably connected inside the guide channel.

[0035] A linkage plate is fixedly connected to the side of the linkage shaft near the transmission rod. A linkage through groove is provided in the middle of the linkage plate, and the transmission rod is also movably connected inside the linkage through groove.

[0036] Optionally, the power supply assembly includes:

[0037] Two linkage rods are rotatably connected to the middle of two support plates respectively. A pulley is fixedly connected to the outer side of each linkage rod. A drive motor is fixedly connected to one side of one of the support plates, and the output end of the drive motor is also fixedly connected to one of the linkage rods. A transmission belt is provided between the two pulleys.

[0038] A transfer frame is fixedly connected to a transmission belt. One end of the transfer frame is fixedly connected to a positioning seat. A rotating shaft is rotatably connected to the inner side of the positioning seat. The top and bottom ends of the outer side of the rotating shaft are threaded, and the threads of the two threaded ends are opposite in direction. A positioning clamp is threadedly connected to each of the two threaded ends.

[0039] In summary, this application includes at least one of the following beneficial technical effects:

[0040] Silver-plated copper conductors reduce conductor loss by 20%–25%, PTFE layered wrapping and heat setting stabilize the dielectric constant of the insulation layer at 2.1±0.02, the outer conductor and shielding layer structure ensures shielding efficiency ≥95%, and gradient cooling ensures sheath elongation at break ≥250%, ultimately achieving the dual advantages of high frequency, low loss and high structural stability, solving the problems of high high frequency signal loss and poor structural stability in existing millimeter wave test cables;

[0041] Through the structural coordination of the pretreatment equipment, the drying process can be quickly switched after the silver-plated copper conductor is cleaned, which greatly improves the pretreatment efficiency of the silver-plated copper conductor and allows it to be quickly transferred to the subsequent wrapping process. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the preprocessing equipment of this application.

[0043] Figure 2 yes Figure 1 The diagram shows the separate structure of the frame and drying assembly.

[0044] Figure 3 yes Figure 1 The diagram shows the structure of the lead assembly.

[0045] Figure 4 yes Figure 2 The diagram shows the assembly structure of support roller A.

[0046] Figure 5 yes Figure 1 The diagram shows the assembly structure of the support roller B.

[0047] Figure 6 yes Figure 2 The diagram shows the structure of the drying assembly.

[0048] Figure 7 yes Figure 6 The diagram shows the internal structure of the heating chamber.

[0049] Figure 8 yes Figure 6 The diagram shows the assembly structure of the displacement plate.

[0050] Figure 9 yes Figure 8 The diagram shows the assembly structure of the transmission rod.

[0051] Figure 10 yes Figure 9 The diagram shows the assembly structure of the extension plate.

[0052] Figure 11 yes Figure 1 The diagram shows the structure of the power supply assembly.

[0053] Figure 12 yes Figure 11 The diagram shows the assembly structure of the positioning seat. Detailed Implementation

[0054] The following is in conjunction with the appendix Figure 1 -Appendix Figure 12 This application will be described in further detail.

[0055] This application discloses a manufacturing process for a low-loss millimeter-wave test cable, the steps of which are as follows:

[0056] The first step is conductor pretreatment, which involves selecting silver-plated copper conductors, cleaning them with pretreatment equipment, and then drying them.

[0057] More specifically, in this embodiment, the diameter of the silver-plated copper conductor is 0.75-0.8 mm, the thickness of the silver plating layer of the silver-plated copper conductor is 1.8-2 μm, and the surface roughness of the silver-plated copper conductor is ≤0.8 μm.

[0058] Furthermore, the drying temperature for silver-plated copper conductors is 80-100℃, and the drying time is 15-20 minutes.

[0059] The second step is PTFE insulation layer wrapping and heat setting. PTFE film is used to wrap the pretreated silver-plated copper conductor in layers. After wrapping, the material is sent to a heat setting furnace for high-temperature heat setting.

[0060] More specifically, the PTFE film has a thickness of 0.05–0.12 mm, and the pretreated silver-plated copper conductor is wrapped in 4–6 layers with an overlap rate of 50%–75%, with the wrapping tension controlled at 3–5 N.

[0061] Furthermore, the heat setting temperature is 180-200℃, and the holding time is 8-10 hours.

[0062] In this embodiment, when the PTFE film is wrapped in layers, the wrapping directions of adjacent layers are opposite. The first layer is wrapped clockwise, and the second layer is wrapped counterclockwise, and so on.

[0063] The third step is to wrap silver-plated copper flat strip around the PTFE insulation layer.

[0064] More specifically, the silver-plated copper flat strip has a width of 1.2-1.5mm and a thickness of 0.03-0.05mm, and is wrapped around the PTFE insulation layer with an overlap rate of 40%-50%, with a wrapping tension of 4-6N.

[0065] The fourth step involves wrapping a composite aluminum foil and a PTFE film around the silver-plated copper flat strip to form a stabilizing layer.

[0066] More specifically, the thickness of the composite aluminum foil is 0.04-0.05 mm, the thickness of the PTFE film is 0.05-0.08 mm, and the overlap rate of the composite aluminum foil wrapping is ≥50%, while the wrapping tension of the PTFE film is 4-5 N.

[0067] Furthermore, during the silver-plated copper wire bundling process, a wire bundling machine is used for untwisting and bundling, with an untwisting angle of 15°-20°, resulting in a bundle diameter of 0.3-0.4mm after bundling.

[0068] The fifth step is to prepare the shielding layer by twisting multiple silver-plated copper wires together and weaving them outside the stabilizing layer to form a shielding layer.

[0069] More specifically, the diameter of the silver-plated copper wire is 0.08-0.1mm, with 6-8 wires in each bundle, woven outside the stabilizing layer at a weaving angle of 30°-40° and a weaving density of ≥95%, with a weaving tension of 1.5-2N.

[0070] The sixth step is FEP sheath extrusion and gradient cooling. FEP raw material is extruded by a single screw extruder to coat the braided shielding layer. After extrusion, the cable is first sent to a hot water tank for pre-cooling, and then transferred to a cold water tank to cool to room temperature.

[0071] More specifically, the extrusion temperature is 280-350℃, and the sheath thickness is 0.2-0.3mm.

[0072] The hot water tank has a temperature of 45-55℃ with a temperature fluctuation range of ≤±3℃, a pre-cooling time of 10-15s with a temperature fluctuation range of ≤±3℃, and a cold water tank has a temperature of 15-25℃.

[0073] Furthermore, the take-up speed is matched with the extrusion speed to 8-thread rod (12) m / min.

[0074] In summary, silver-plated copper conductors are selected to reduce conductor resistance; PTFE layered wrapping combined with high-temperature heat setting eliminates interlayer gaps, improves insulation density, and reduces dielectric loss; silver-plated copper flat strip wrapping ensures the basic conductivity of the outer conductor; composite aluminum foil + PTFE stabilizing layer enhances structural support; and silver-plated copper wire braided shielding layer improves anti-interference capability. The three-layer structure works together to reduce signal leakage. At the same time, pre-cooling in a hot water bath avoids internal stress caused by sudden cooling of the sheath, and then rapid cooling and setting in a cold water bath ensures the dimensional accuracy and mechanical properties of the sheath.

[0075] This application discloses a pretreatment device for the production of low-loss millimeter-wave test cables, comprising:

[0076] A frame 1 has positioning frames 2 fixedly connected to both ends. Each positioning frame 2 is equipped with a lead wire assembly 3 at its top. One lead wire assembly 3 is used to release the silver-plated copper conductor to be cleaned and dried, and the other lead wire assembly 3 is used to reel in the cleaned and dried silver-plated copper conductor. An ultrasonic cleaner 4 is embedded at the top of the frame 1, and a wire assembly 5 is provided at the top of the frame 1.

[0077] More specifically, the ultrasonic cleaner 4 includes:

[0078] An ultrasonic generator is used to convert mains power into high-frequency electrical signals to provide an energy source for the transducer;

[0079] An ultrasonic transducer, installed at the bottom or side of the cleaning tank, is responsible for converting high-frequency electrical energy into mechanical vibration.

[0080] A cleaning tank is a stainless steel container for holding cleaning fluid and serves as the working chamber for cleaning operations.

[0081] A heating and temperature control system is used to increase the temperature of the cleaning solution to enhance the cleaning effect;

[0082] The control system, including timers, power regulation, and temperature display, is used to set and monitor cleaning parameters.

[0083] When ultrasound propagates in a liquid, it generates alternating positive and negative pressure phases. During the negative pressure phase, numerous tiny bubbles form inside the liquid; when the pressure shifts to the positive phase, these bubbles rapidly collapse and burst, instantly generating localized high temperatures and pressures, and releasing intense shock waves and microjets. This process removes oil, dust, oxides, and other contaminants from the surface of the silver-plated copper conductor, achieving a precise cleaning effect that traditional brushing or soaking cannot reach. This is a mature existing technology and will not be elaborated upon further here.

[0084] Drying assembly 6 is mounted on the top of frame 1 away from ultrasonic cleaner 4. Lead assembly 5 is used to pass silver-plated copper conductor between lead assembly 3, ultrasonic cleaner 4 and drying assembly 6.

[0085] Two trays 7 are fixedly connected to both ends of the frame 1. A wire supply assembly 8 is assembled between the two trays 7. The wire supply assembly 8 is used to cooperate with the lead wire assembly 3 to form the initial setup of the silver-plated copper conductor to be processed.

[0086] Please refer to Figure 3 In this embodiment, the lead assembly 3 includes:

[0087] The mounting shaft 9 is rotatably connected to the top of the positioning frame 2. The top of the positioning frame 2 is fixedly connected to the drive motor 10, and the output end of the drive motor 10 is also fixedly connected to the mounting shaft 9.

[0088] The coil 11 is sleeved on the outside of the mounting shaft 9. The end of the mounting shaft 9 away from the transmission motor 10 is fixedly connected to a threaded rod 12, and a baffle 13 is threadedly connected to the outside of the threaded rod 12.

[0089] Please refer to Figure 3 In this embodiment, the baffle 13 has a threaded hole in the middle, and the baffle 13 is connected to the threaded rod 12 through the threaded hole.

[0090] Furthermore, with the threaded hole, when the baffle 13 is rotated, the baffle 13 can be adjusted along the threaded rod 12 until it contacts the coil 11, so that the mounting shaft 9 can be assembled onto the coil 11.

[0091] Please refer to Figure 5 In this embodiment, the wire assembly 5 includes:

[0092] Multiple support seats 14 are fixedly connected to the top of the frame 1, and a support roller A15 is rotatably connected to the top of each support seat 14.

[0093] The limiting frame 16 is fixedly connected to the top of the frame 1. The top of the limiting frame 16 is vertically slidably connected to the limiting rod 17. The bottom end of the limiting rod 17 is fixedly connected to the adjusting plate 18. The middle part of the adjusting plate 18 is provided with a guide groove 19.

[0094] Please refer to Figure 5 In this embodiment, there are two limit frames 16, which are located at both ends of the adjustment plate 18. By setting the two limit frames 16, the adjustment plate 18 can be guided at multiple points in conjunction with the limit rod 17, which greatly ensures the stability of the adjustment plate 18 during adjustment.

[0095] Please refer to Figure 5 In this embodiment, a baffle is fixedly connected to the top of the limiting rod 17. By setting the baffle, the limiting rod 17 can be prevented from detaching from the limiting frame 16, thereby ensuring the assembly effect of the limiting rod 17 and the limiting frame 16.

[0096] The guide plate 20 is fixedly connected to the bottom of the adjusting plate 18. The bottom of the guide plate 20 is fixedly connected to the support frame 21. Multiple support rollers B22 are rotatably connected to one side of the support frame 21.

[0097] Please refer to Figure 6 In this embodiment, the drying component 6 includes:

[0098] Drying box 23 is fixedly connected to the top of the frame 1 at the end away from the ultrasonic cleaner 4. A diversion pipe 24 is fixedly connected to the top of the inside of the drying box 23. Multiple drying branch pipes 25 are fixedly connected to both sides of the diversion pipe 24.

[0099] Please refer to Figure 7 In this embodiment, each drying branch pipe 25 has multiple air jet holes at its bottom end, and each air jet hole has a nozzle fixedly connected inside.

[0100] More specifically, through the structural cooperation between the jet hole and the nozzle, the airflow entering the drying branch pipe 25 can be discharged over a wider range, reducing the blind spot of the drying branch pipe 25.

[0101] An air supply fan 26 is fixedly connected to the top of the drying chamber 23. A transmission pipe 27 is fixedly connected to the output end of the air supply fan 26. A heating chamber 28 is fixedly connected to the top of the drying chamber 23. The end of the transmission pipe 27 away from the air supply fan 26 is also connected to the heating chamber 28.

[0102] Please refer to Figure 7 In this embodiment, a filter cylinder is fixedly connected to the input end of the air supply fan 26, and a filter screen is fixedly connected inside the filter cylinder.

[0103] More specifically, in conjunction with the filter cartridge, when the airflow passes through the filter cartridge, the filter screen can remove large-sized impurities from the airflow, preventing impurities from entering the air supply fan 26 and causing damage to the impeller of the air supply fan 26.

[0104] An electric heating wire 29 is fixedly connected inside the heating chamber 28. A gas supply pipe 30 is fixedly connected to the top of one side of the heating chamber 28. The end of the gas supply pipe 30 away from the heating chamber 28 is also connected to the diversion pipe 24.

[0105] Two sealing doors 31 are vertically slidably connected to both ends of the drying oven 23. A relief groove 32 is provided in the middle of the sealing door 31, and a heat insulation curtain 33 is fixedly connected to the relief groove 32.

[0106] Please refer to Figure 6 In this embodiment, the drying box 23 has openings at both ends, which allow the silver-plated copper conductor to be moved into or out of the drying box 23.

[0107] Please refer to Figure 8 In this embodiment, guide strips are vertically fixedly connected to both ends of the drying box 23, and a guide groove is provided at one end of the sealing door 31 near the guide strip. The sealing door 31 is slidably connected to the guide strip through the guide groove.

[0108] More specifically, the guide strips and guide grooves can guide the vertical displacement of the blocking door 31, ensuring the displacement effect of the blocking door 31.

[0109] A transmission frame 34 is fixedly connected to the top of the drying oven 23. A hydraulic cylinder 35 is fixedly connected to the top of the transmission frame 34. A displacement plate 36 is fixedly connected to the output end of the hydraulic cylinder 35, and the two ends of the displacement plate 36 are fixedly connected to two sealing doors 31 respectively.

[0110] In other embodiments, a threaded rod is rotatably provided on the inner side of the transmission frame 34 to generate a threaded transmission relationship with the displacement plate 36. At the same time, an electric motor for driving the threaded rod is fixed on the top of the transmission frame 34. When the electric motor is driving, it can drive the displacement plate 36 to adjust the corresponding position along the threaded rod, thereby meeting the transmission requirements of the blocking door 31.

[0111] More specifically, an observation window is provided on one side of the drying oven 23. The observation window is made of transparent material, and its presence allows personnel to observe the internal condition of the drying oven 23 through the observation window.

[0112] A transmission assembly is installed between one of the blocking doors 31 and the adjusting plate 18. The transmission assembly is used to cooperate with the adjusting plate 18 to change the vertical position of the support frame 21.

[0113] Please refer to Figure 9In this embodiment, the transmission assembly includes:

[0114] An extension plate 37 is fixedly connected to the top of one of the sealing doors 31. A transmission rod 38 is fixedly connected to the end of the extension plate 37 away from the sealing door 31. A linkage shaft 39 is rotatably connected to the top of the frame 1 near the ultrasonic cleaner 4. A push plate 40 is fixedly connected to one end of the linkage shaft 39. A push rod 41 is fixedly connected to the end of the push plate 40 away from the linkage shaft 39. The push rod 41 is also movably connected inside the guide channel 19.

[0115] Linkage plate 42 is fixedly connected to the side of linkage shaft 39 near transmission rod 38. Linkage through groove 43 is provided in the middle of linkage plate 42, and transmission rod 38 is also movably connected inside linkage through groove 43.

[0116] Please refer to Figure 11 In this embodiment, the power supply assembly 8 includes:

[0117] Two linkage rods 44 are rotatably connected to the middle of two support plates 7 respectively. A pulley 45 is fixedly connected to the outer side of the linkage rod 44. A drive motor 46 is fixedly connected to one side of one of the support plates 7, and the output end of the drive motor 46 is also fixedly connected to one of the linkage rods 44. A transmission belt 47 is provided between the two pulleys 45.

[0118] In other embodiments, on the one hand, the pulley 45 can be replaced with a sprocket and the drive belt 47 can be replaced with a chain. When the drive motor 46 drives one of the sprockets to rotate, the position of the transmission frame 48 can be changed by means of the chain adjusting between the two sprockets.

[0119] On the other hand, a rodless cylinder can be directly installed between the two pallets 7, and the transfer frame 48 can be connected to the output end of the rodless cylinder. When the rodless cylinder is running, it can drive the transfer frame 48 to make adaptive adjustments.

[0120] The transfer frame 48 is fixedly connected to the transmission belt 47. One end of the transfer frame 48 is fixedly connected to the positioning seat 49. The inner side of the positioning seat 49 is rotatably connected to the rotating shaft 50. The top and bottom ends of the outer side of the rotating shaft 50 are both provided with threaded ends 51, and the threads of the two threaded ends 51 are opposite. The two threaded ends 51 are threadedly connected to the positioning clamps 52.

[0121] Please refer to Figure 11 In this embodiment, a guide slide rod is fixedly connected between the two trays 7, and a linear slider is fixedly connected to the bottom end of the transfer frame 48, and the linear slider is also slidably connected to the guide slide rod.

[0122] More specifically, the structural cooperation between the guide slide and the linear slider can guide the displacement of the transfer frame 48 and prevent the transfer frame 48 from undergoing uncontrollable displacement.

[0123] Please refer to Figure 12 In this embodiment, anti-slip blocks are fixedly connected to the ends of the two positioning clamps 52 that are close to each other, and the anti-slip blocks have anti-slip textures.

[0124] More specifically, the anti-slip block design ensures that the positioning clamp 52 can stably contact the silver-plated copper conductor, guaranteeing the clamping stability of the positioning clamp 52.

[0125] The implementation principle of the pretreatment equipment in this application embodiment is as follows: First, the coil 11 with the silver-plated copper conductor to be cleaned and dried is placed on the mounting shaft 9 located at one end of the ultrasonic cleaner 4, and the baffle 13 is rotated to cause the baffle 13 to move on the threaded rod 12 until the coil 11 is locked on the mounting shaft 9.

[0126] Then, the free end of the silver-plated copper conductor is released and placed between the two positioning clamps 52. Then, the rotating shaft 50 is rotated. With the two threads on the rotating shaft 50 turned towards the threaded end 51, the two positioning clamps 52 can be driven to move closer to each other until the free end of the silver-plated copper conductor is clamped between the two positioning clamps 52.

[0127] Then start the drive motor 10 to release the silver-plated copper conductor. At the same time, start the drive motor 46 to drive the linkage rod 44 connected to it to rotate. Since the transmission belt 47 is connected between the two pulleys 45, when the linkage rod 44 rotates, it can drive the transmission frame 48 to adjust laterally through the transmission belt 47, so that the free end of the silver-plated copper conductor passes over the support roller A15 and under the support roller B22 until the free end of the silver-plated copper conductor reaches another coil 11 and is connected to the other coil 11.

[0128] The hydraulic cylinder 35 is activated to pull the displacement plate 36. With the connection between the displacement plate 36 and the sealing door 31, the sealing door 31 can move upward with the displacement plate 36, thus releasing the sealing door 31. Since the transmission rod 38 is connected inside the linkage channel 43, when the transmission rod 38 moves upward, it can drive the push plate 40 to rotate downward by means of the adaptive adjustment of the transmission rod 38 inside the linkage channel 43. Since the push rod 41 is connected inside the guide channel 19, with the adaptive displacement of the push rod 41 inside the guide channel 19, it will drive the support frame 21 to adjust downward. Since the silver-plated copper conductor is located below the support roller B22, as the support roller B22 continues to move downward, the silver-plated copper conductor will enter the ultrasonic cleaner 4.

[0129] Next, the ultrasonic cleaner 4 is started to clean the silver-plated copper conductor inside the ultrasonic cleaner 4. At the same time, two drive motors 10 are started to release the silver-plated copper conductor and, with the help of another coil 11, to wind up the released silver-plated copper conductor.

[0130] After the cleaned silver-plated copper conductor is removed from the ultrasonic cleaner 4, it will enter the drying chamber 23. At the same time, the air supply fan 26 will be started to inject the airflow into the heating chamber 28 through the transmission pipe 27, and the airflow will be heated by the electric heating wire 29. The heated airflow will be injected into the distribution pipe 24 through the air supply pipe 30, and finally sprayed onto the silver-plated copper conductor through the drying branch pipe 25 to dry it, thereby realizing the pretreatment of the silver-plated copper conductor.

[0131] After the silver-plated copper conductor on the single coil 11 is consumed, the hydraulic cylinder 35 is activated to push the displacement plate 36 down, causing the sealing door 31 to seal the drying box 23, preventing the heat inside the drying box 23 from dissipating too quickly. At the same time, in conjunction with the connection between the transmission rod 38 and the linkage channel 43, the support roller B22 will be moved out of the ultrasonic cleaner 4, waiting for the next coil of silver-plated copper conductor to pass through.

[0132] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manufacturing process for a low-loss millimeter-wave test cable, characterized in that: The steps are as follows: The first step is conductor pretreatment, which involves selecting silver-plated copper conductors, cleaning them with pretreatment equipment, and then drying them. The second step is PTFE insulation layer wrapping and heat setting. PTFE film is used to wrap the pre-treated silver-plated copper conductor in layers. After wrapping, it is sent to a heat setting furnace for high-temperature heat setting. The third step is to wrap silver-plated copper flat strip around the PTFE insulation layer; The fourth step is to wrap a composite aluminum foil and a PTFE film around the silver-plated copper flat strip in sequence to form a stabilizing layer; The fifth step is to prepare the shielding layer by twisting multiple silver-plated copper wires together and weaving them outside the stabilizing layer to form a shielding layer. The sixth step is FEP sheath extrusion and gradient cooling. FEP raw material is extruded through a single screw extruder to coat the braided shielding layer. After extrusion, the cable is first sent to a hot water tank for pre-cooling, and then transferred to a cold water tank to cool to room temperature. The pretreatment equipment includes: A frame (1) is fixedly connected to both ends of the frame (1) with a positioning frame (2). Each positioning frame (2) is equipped with a lead wire assembly (3) at its top. One of the lead wire assemblies (3) is used to release the silver-plated copper conductor to be cleaned and dried, and the other lead wire assembly (3) is used to rewind the silver-plated copper conductor after cleaning and drying. An ultrasonic cleaner (4) is embedded at the top of a frame (1), and a wire assembly (5) is provided at the top of the frame (1). Drying assembly (6), which is mounted on the top of the frame (1) away from the ultrasonic cleaner (4), and the wire assembly (5) is used to transfer the silver-plated copper conductor between the lead assembly (3), the ultrasonic cleaner (4) and the drying assembly (6). Two trays (7) are fixedly connected to both ends of the frame (1). A wire supply assembly (8) is assembled between the two trays (7). The wire supply assembly (8) is used to cooperate with the lead assembly (3) to form the initial setup of the silver-plated copper conductor to be processed.

2. The manufacturing process for a low-loss millimeter-wave test cable according to claim 1, characterized in that: The lead assembly (3) includes: A mounting shaft (9) is rotatably connected to the top of a positioning frame (2). A drive motor (10) is fixedly connected to the top of the positioning frame (2), and the output end of the drive motor (10) is also fixedly connected to the mounting shaft (9). A coil (11) is sleeved on the outside of a mounting shaft (9). A threaded rod (12) is fixedly connected to one end of the mounting shaft (9) away from the drive motor (10). A baffle (13) is threadedly connected to the outside of the threaded rod (12).

3. The manufacturing process for a low-loss millimeter-wave test cable according to claim 1, characterized in that: The conductor assembly (5) includes: Multiple support seats (14) are fixedly connected to the top of the frame (1), and each support seat (14) is rotatably connected to the top of the top of the frame (1). A limiting frame (16) is fixedly connected to the top of the frame (1). A limiting rod (17) is vertically slidably connected to the top of the limiting frame (16). An adjusting plate (18) is fixedly connected to the bottom of the limiting rod (17). A guide groove (19) is provided in the middle of the adjusting plate (18). A guide plate (20) is fixedly connected to the bottom of an adjusting plate (18). A support frame (21) is fixedly connected to the bottom of the guide plate (20). A plurality of support rollers B (22) are rotatably connected to one side of the support frame (21).

4. The manufacturing process for a low-loss millimeter-wave test cable according to claim 3, characterized in that: The drying assembly (6) includes: Drying box (23), the drying box (23) is fixedly connected to the top of the frame (1) away from the ultrasonic cleaner (4), the top of the drying box (23) is fixedly connected to a diversion pipe (24), and multiple drying branch pipes (25) are fixedly connected to both sides of the diversion pipe (24). An air supply fan (26) is fixedly connected to the top of the drying box (23). A transmission pipe (27) is fixedly connected to the output end of the air supply fan (26). A heating box (28) is fixedly connected to the top of the drying box (23). The end of the transmission pipe (27) away from the air supply fan (26) is also connected to the heating box (28). An electric heating wire (29) is fixedly connected inside a heating box (28). A gas supply pipe (30) is fixedly connected to the top of one side of the heating box (28). The end of the gas supply pipe (30) away from the heating box (28) is also connected to a shunt pipe (24). Two sealing doors (31) are vertically slidably connected to both ends of the drying box (23). A relief groove (32) is provided in the middle of the sealing door (31), and a heat insulation curtain (33) is fixedly connected to the relief groove (32). A transmission frame (34) is fixedly connected to the top of the drying box (23). A hydraulic cylinder (35) is fixedly connected to the top of the transmission frame (34). A displacement plate (36) is fixedly connected to the output end of the hydraulic cylinder (35), and the two ends of the displacement plate (36) are fixedly connected to two sealing doors (31) respectively. A transmission assembly is mounted between one of the blocking doors (31) and the adjusting plate (18), and the transmission assembly is used to cooperate with the adjusting plate (18) to change the vertical position of the support frame (21).

5. The manufacturing process for a low-loss millimeter-wave test cable according to claim 4, characterized in that: The transmission assembly includes: An extension plate (37) is fixedly connected to the top of one of the sealing doors (31). A transmission rod (38) is fixedly connected to the end of the extension plate (37) away from the sealing door (31). A linkage shaft (39) is rotatably connected to the top of the frame (1) near the ultrasonic cleaner (4). A push plate (40) is fixedly connected to one end of the linkage shaft (39). A push rod (41) is fixedly connected to the end of the push plate (40) away from the linkage shaft (39). The push rod (41) is also movably connected inside the guide channel (19). Linkage plate (42), which is fixedly connected to the side of the linkage shaft (39) near the transmission rod (38), has a linkage through groove (43) in the middle, and the transmission rod (38) is also movably connected inside the linkage through groove (43).

6. The manufacturing process for a low-loss millimeter-wave test cable according to claim 1, characterized in that: The power supply assembly (8) includes: Two linkage rods (44) are rotatably connected to the middle of two support plates (7). A pulley (45) is fixedly connected to the outer side of each linkage rod (44). A drive motor (46) is fixedly connected to one side of one of the support plates (7), and the output end of the drive motor (46) is also fixedly connected to one of the linkage rods (44). A transmission belt (47) is provided between the two pulleys (45). A transfer frame (48) is fixedly connected to a transmission belt (47). One end of the transfer frame (48) is fixedly connected to a positioning seat (49). A rotating shaft (50) is rotatably connected to the inner side of the positioning seat (49). Threaded ends (51) are provided at the top and bottom of the outer side of the rotating shaft (50), and the threads of the two threaded ends (51) are opposite in direction. Positioning clamps (52) are threadedly connected to the two threaded ends (51).

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