Plastic corrugated cooling pipe for automobile and forming equipment of plastic corrugated cooling pipe

Abstract

The invention relates to the technical field of corrugated cooling pipe manufacturing, and particularly discloses a plastic corrugated cooling pipe for an automobile, which comprises a pipe body, and the pipe body is provided with an asymmetric corrugated structure formed by alternately arranged peak parts and valley parts; the inner layer of the pipe body is a heat-conducting modified nylon pipe, and the outer layer of the pipe body is a heat-conducting modified nylon pipe. The reinforcing layer is of a continuous spiral winding structure of a single high-carbon steel wire, and the surface of the steel wire is coated with a modified polyamide hot melting treatment layer; the outer layer is a weather-proof thermoplastic polyurethane layer and wraps the inner layer wound with the reinforcing layer to form the corrugated cooling pipe. The corrugated cooling pipe has the effects that the pressure resistance and the fatigue resistance of the corrugated cooling pipe are improved, and the overall sealing performance and the long-term reliability are improved.

Description

Technical Field

[0001] The present application relates to the technical field of corrugated cooling pipe manufacturing, and in particular to a plastic corrugated cooling pipe for automobiles and a molding device thereof. Background Art

[0002] With the advancement of lightweight and energy-efficient automobiles, plastic corrugated cooling pipes have gradually replaced traditional metal pipes due to their advantages such as light weight, corrosion resistance, and high flexibility. They are widely used in automotive cooling systems, fuel systems, and exhaust systems. Among them, steel wire reinforced plastic corrugated hoses have become core components of cooling pipes due to their high pressure resistance, deformation resistance, and bendability. Such pipes are usually manufactured using a winding and overmolding process, which forms a corrugated structure by evenly wrapping molten plastic around the surface of a rotating steel wire skeleton and cooling it to form a fixed shape. However, as automotive cooling systems have increasingly stringent requirements for pipe sealing, fatigue resistance, and long-term reliability, defects in the molding process have gradually become a key bottleneck restricting product performance improvements.

[0003] Currently, the mainstream corrugated cooling pipe forming technologies in the industry mainly include extrusion winding, injection molding, and multi-layer co-extrusion. Extrusion winding is widely adopted due to its high production efficiency and low equipment cost. Its core process is to spirally wind molten plastic through the extruder head onto a steel wire skeleton, and then use a mold to press it to form a corrugated profile. For example, the Chinese patent with publication number CN119458841A in the related art proposes an exhaust bellows extrusion manufacturing equipment. The raw material is heated and plasticized into a plastic sheet through an extruder. It is then wound with steel wire conveyed by a reeling device in a mold device to form a corrugated pipe. The formed corrugated pipe is shaped by a cooling device and then cut to size by a shearing device (first cutting the plastic layer and then cutting the steel wire). The clamping assembly (first / second clamping members and insertion member) is then precisely inserted into the corrugated pipe trough. The moving drive component compresses and folds the corrugated pipe, shortening its length for storage. The compressed corrugated pipe slides into a receiving bin via an inclined discharge plate, avoiding the inconvenience of traditional large-volume material collection.

[0004] However, during the spiral winding process, when the molten plastic is extruded from the extruder head and continuously wrapped around the steel wire skeleton, in the overlapping area of ​​adjacent winding layers (i.e., the overlap area), the corrugated cooling pipe is very likely to cause the winding trajectory to deviate due to rotational inertia and extruder discharge fluctuations, resulting in uneven wall thickness distribution in the overlap area. This will greatly reduce the fatigue resistance of the corrugated cooling pipe, and will also cause internal stress concentration in the subsequent cooling and shaping stage, resulting in wall cracks or sealing failure in the corrugated cooling pipe. Once the corrugated cooling pipe is under high temperature and high pressure conditions, the area with sudden changes in wall thickness can easily become a weak point for leakage or pipe burst, seriously threatening the stability of the vehicle's cooling system. Summary of the Invention

[0005] The present application provides a plastic corrugated cooling pipe for automobiles and a molding device thereof. The plastic corrugated cooling pipe for automobiles has excellent comprehensive performance. At the same time, the molding device for the plastic corrugated cooling pipe for automobiles can not only greatly improve the production efficiency of the corrugated cooling pipe, but also perform targeted treatment on the uneven wall thickness distribution that occurs during production, thereby ensuring the overall quality and production stability of the corrugated cooling pipe.

[0006] In the first aspect, the present application provides a plastic corrugated cooling pipe for automobiles using the following technical solution: A plastic corrugated cooling pipe for automobile, comprising: A tube body having an asymmetric corrugated structure formed by alternately arranged peaks and valleys; The tube body is configured from inside to outside in sequence as follows: An inner layer, wherein the inner layer is configured as a thermally conductive modified nylon tube; The reinforcement layer is configured as a single high-carbon steel wire continuously spirally wound structure, the steel wire being wound around the outer surface of the inner layer at a winding angle a and a constant pitch, wherein the pitch S of the spiral winding of the steel wire and the diameter d of the steel wire satisfy the relationship S=kd, where k is set to a constant; wherein the surface of the steel wire is coated with a modified polyamide hot-melt treatment layer; The outer layer is configured as a weather-resistant thermoplastic polyurethane layer, and the outer layer is coated on the inner layer wrapped with the reinforcement layer to form a corrugated cooling pipe, and the ratio of the corrugation depth H to the inner diameter D of the pipe body is b, wherein the corrugation depth refers to the height from the peak to the valley of the corrugation.

[0007] By adopting the above technical solution, the plastic corrugated cooling pipe adopts an asymmetric corrugated structure and a layered structure. The thermal conductive nylon inner layer improves the heat transfer efficiency, and the high-carbon steel wire reinforcement layer is wound at a specific angle and pitch to improve the pressure resistance and fatigue resistance of the pipe body. The coated hot-melt layer improves the bonding strength between the steel wire and the plastic layer, which helps to improve the overall sealing and long-term reliability; the outer layer uses weather-resistant polyurethane material to enhance aging resistance and environmental adaptability.

[0008] In a second aspect, the present application provides a molding device for a plastic corrugated cooling pipe for an automobile, with the following technical solutions: A molding device for a plastic corrugated cooling pipe for an automobile, comprising a machine platform, a rotary drive member, and a guide frame. The machine platform is disposed on one side of a first extruder discharge port. A controller is disposed on the machine platform. A bearing seat is fixedly disposed on the machine platform. The rotary drive member is fixedly disposed on the bearing seat and electrically connected to the controller. A transmission shaft is fixedly disposed on the output end of the rotary drive member. The guide frame is fixedly sleeved on the transmission shaft. The guide frame includes a guide rod and a forming cylinder, and the transmission shaft is fixed with a first fixed disk, a second fixed disk and a third fixed disk in sequence. The forming cylinder is sleeved on the transmission shaft, and the forming cylinder is located between the first fixed disk and the second fixed disk. One end of the forming cylinder is fixedly connected to the first fixed disk, and the other end of the forming cylinder is fixedly connected to the second fixed disk. The guide rod is arranged between the second fixed disk and the third fixed disk, one end of the guide rod is connected to the second fixed disk, and the other end of the guide rod is connected to the third fixed disk. There are multiple groups of guide rods on the transmission shaft, and the multiple groups of guide rods are distributed circumferentially with the transmission shaft as the axis.

[0009] By adopting the above technical solution, the first to third fixed plates and the forming cylinders and guide rods arranged at intervals inside the guide frame, the forming cylinders enable the inner tube to be stably guided and shaped during the forming process, while the multiple sets of guide rods ensure the uniformity of steel wire winding and the consistency of winding angles; at the same time, the multiple sets of guide rods are distributed in a ring with the transmission shaft as the axis, which can support and guide the inner tube at multiple angles and points, prevent the inner tube from deflecting or twisting, improve the forming accuracy and the synchronization of equipment operation, provide a good foundation for the subsequent covering of the outer layer material, and effectively improve the overall forming quality and production efficiency of the corrugated pipe.

[0010] Optionally, the molding equipment further includes a traction mechanism, which includes a reciprocating screw, a transmission gear, a gear ring, a slide and a limit block. The reciprocating screw is arranged between the second fixed disk and the third fixed disk, one end of the reciprocating screw is rotatably passed through the second fixed disk, and the other end of the reciprocating screw is rotatably connected to the third fixed disk. An extension rod is fixed to one end of the reciprocating screw close to the second fixed disk, and the extension rod is rotatably passed through the first fixed disk. The transmission gear is fixed to the extension rod away from the second fixed disk. At one end of the reciprocating screw, a fixed seat is fixed on the machine platform, the fixed group is located on the side of the first fixed disk away from the forming cylinder, the gear ring is fixed on the fixed seat, and the transmission gear is engaged with the gear ring; the slide is arranged on the reciprocating screw, the slide is threadedly connected to the reciprocating screw, the limit block is rotatably arranged on the slide, the slide is provided with a first plug-in slot, and the limit block is provided with a second plug-in slot, the first plug-in slot and the second plug-in slot can be combined to form a limit hole for fixing the end of the steel wire.

[0011] By adopting the above technical solution, the traction mechanism adopts a combination of multiple structures including a reciprocating screw, a slide, a limit block, etc., which can provide stable steel wire traction force and guiding accuracy during the winding process; wherein, the limit hole formed by the combination of the first plug-in slot and the second plug-in slot can firmly position the end of the steel wire, and the set slide can realize reciprocating movement under the action of the screw, thereby realizing automatic traction and winding of the steel wire, reducing labor costs, and reducing the impact of human errors on product performance; combined with the multiple sets of guide rods set on the guide frame, it effectively avoids slipping or deviation of the steel wire at the beginning of winding, thereby improving the consistency of the spiral winding angle and pitch of the steel wire, and also improving the close fit and corrugation stability of the entire reinforcement layer during the molding process, effectively reducing the misalignment between the outer wall of the inner tube and the steel wire, and laying a uniform foundation for the subsequent outer plastic coating.

[0012] Optionally, the slide is further provided with a locking piece, the locking piece includes a locking pin, a tightening spring and a pressing rod, the limit block is respectively provided with an inserting slot and a receiving slot, the inserting slot and the receiving slot are cross-arranged, the slide is fixed with an inserting portion, the inserting portion is respectively provided with a locking hole and a giving slot, the giving slot is communicated with the locking hole, and the giving slot passes through an end of the slide that is away from the inserting portion, the locking pin and the tightening spring are both slidably arranged in the receiving slot, one end of the tightening spring is connected to one end of the locking pin, and the other end of the tightening spring is connected to the receiving slot. The inner wall of the receiving groove is connected, and one end of the locking pin is away from the tightening spring and is plugged into the locking hole, and the diameter of the locking pin is larger than the groove width of the give way groove. The pressing rod is fixed on the side of the third fixed plate close to the second fixed plate, and the diameter of the pressing rod is smaller than the groove width of the give way groove. The pressing rod is plugged into the receiving groove. When the slide moves to one side of the third fixed plate, the pressing rod is inserted into the receiving groove, and one end of the pressing rod pushes one end of the locking pin out of the locking hole, thereby causing the limit block to swing to one side, thereby releasing the fixed limit on one end of the steel wire.

[0013] By adopting the above technical solution, a mechanical interlocking structure is set between the limit block and the slide seat to achieve reliable fixation and quick release of the steel wire end. Under the elastic force of the pressing spring, the locking pin can be stably inserted into the locking hole of the plug-in part, effectively preventing the steel wire from loosening or dislocating during the winding process, and ensuring the stability and repeatability of the starting point of the steel wire winding; the addition of the pressing rod automatically triggers the unlocking action when the slide seat moves to the predetermined position, and the steel wire end release operation can be completed without human intervention, which significantly improves the degree of automation and continuous production efficiency of the equipment, reduces human operation errors, and helps to improve the consistency and structural stability of the finished product of the corrugated cooling tube.

[0014] Optionally, the molding equipment also includes a detection mechanism, which includes an abutment wheel, a compression spring and a pressure sensor. A mounting sleeve is fixedly provided on the surface of the third fixed disk facing away from the second fixed disk, and a mounting bracket is provided on the machine platform. A sliding cylinder is fixedly provided on the mounting bracket, and a sliding rod is slidingly provided in the sliding cylinder. The compression spring and the pressure sensor are both arranged in the sliding cylinder, and the pressure sensor is fixedly embedded in the inner wall of the sliding cylinder. The pressure sensor is electrically connected to the controller, one end of the compression spring is connected to the pressure sensor, and the other end of the compression spring is fixedly connected to one end of the sliding rod. A rotating seat is fixed on the end of the sliding rod away from the compression spring, and the abutment wheel is rotatably provided on the rotating seat. The abutment wheel is movably abutted against the valley position of the corrugated cooling pipe. When the wall thickness of the valley position is uneven, the pressure sensor will experience obvious fluctuations due to the force of the compression spring.

[0015] By adopting the above technical solution, utilizing the set abutment wheel, sliding rod, compression spring, pressure sensor and other components, and through the continuous contact between the abutment wheel and the valley of the corrugated cooling pipe, it is possible to sense in real time the slight changes in the wall thickness of the pipe body in the valley area. When the wall thickness is uneven, the contact pressure between the valley and the abutment wheel changes, thereby causing the deformation of the compression spring to change, and then the corresponding signal fluctuation is detected by the pressure sensor, thereby realizing the continuous wall thickness detection of the corrugated cooling pipe. This detection method not only has high-sensitivity recognition, but also has the characteristics of fast response, accurate feedback, and adaptability to periodic changes in the corrugated structure. It provides a real-time and reliable signal basis for the subsequent adjustment mechanism to perform automatic compensation, significantly improving the intelligence and automation level of the corrugated cooling pipe wall thickness uniformity control, and effectively avoiding the low efficiency and data lag problems of traditional manual sampling or contact measurement methods.

[0016] Optionally, the molding equipment further includes an adjusting mechanism, which includes a liquid storage tank, an infusion tube and a curing lamp. The liquid storage tank is fixedly mounted on the machine platform, and a polymer material with a photoinitiator added is injected into the liquid storage tank. A nozzle is provided at one end of the infusion tube, and the other end of the infusion tube is connected to the liquid storage tank. The nozzle is fixedly mounted on the mounting frame, and the nozzle is located on one side of the abutting wheel. The nozzle sprays toward the abutment position between the abutting wheel and the corrugated cooling tube. The curing lamp is fixed on the mounting frame, and the curing lamp is located on the side of the abutting wheel away from the guide frame. When the force applied to the pressure sensor decreases, the nozzle sprays the polymer material to the corresponding position of the valley to fill it.

[0017] By adopting the above technical solution, a polymer material with added photoinitiator is introduced into an adjusting mechanism to achieve targeted spraying of patching materials at the valley position of the corrugated cooling pipe, which can form a directional repair layer in the area with insufficient wall thickness; the sprayed material is further photocured by a curing lamp, so that the patching layer is quickly cured and formed, forming a good combination with the original pipe structure; this method does not require overall heating and does not damage the original structure, and has the characteristics of rapid response, local repair, and non-contact operation. It effectively solves the structural weakness caused by insufficient wall thickness in the valley of the corrugated pipe, improves the overall uniformity and pressure resistance of the cooling pipe, and avoids the risk of fatigue damage and leakage during use due to differences in wall thickness.

[0018] Optionally, the adjustment mechanism also includes a scraper and a scraping drive member, the scraper is tilted on the mounting frame, the scraper is located on the side of the abutment wheel close to the guide frame, a connecting rod is fixed to one end of the scraper, the connecting rod is slid through the mounting frame, and the scraper is tangent to the valley position of the corrugated cooling tube, the scraping drive member is electrically connected to the controller, the scraping drive member is fixed on the mounting frame, and the scraper is fixedly connected to the output end of the scraping drive member through the connecting rod.

[0019] By adopting the above technical solution, a scraper and a scraping drive are newly provided in the adjustment mechanism, so that the valley position of the corrugated cooling tube can be pre-shaped before entering the wall thickness detection process, and the locally too thick plastic material can be accurately scraped off, thereby avoiding misjudgment of the detection or material redundancy in subsequent processing; this structure makes the wall thickness adjustment work more efficient and targeted, and only needs to compensate for the thin wall area, which improves the overall adjustment efficiency, saves the amount of polymer repair material, and significantly improves the molding accuracy and appearance consistency.

[0020] Optionally, the molding equipment also includes a lap joint mechanism, which includes a driving gear, a driven gear, a first motor and a lap joint rod. A rotating frame is fixed on the machine platform, the rotating frame is sleeved on the transmission shaft, the rotating frame is located on the side of the molding cylinder close to the rotating drive member, the driven gear is sleeved on the transmission shaft, the first motor is fixed on the mounting frame, the first motor is electrically connected to the controller, the driving gear is fixed on the output end of the first motor, the driving gear is meshed with the driven gear, the lap joint rod is fixed on the driven gear, the lap joint rod is parallel to the transmission shaft, and the end of the lap joint rod away from the driven gear is close to the third fixed disk.

[0021] By adopting the above-mentioned technical solution, the overlapping mechanism is set up to drive the overlapping rod to rotate synchronously through the transmission of the driving gear and the driven gear, which can realize the automatic traction of the strip embryo, ensuring that the embryo is quickly and accurately fitted to the guide frame. Compared with the traditional operation of manually pulling the high-temperature embryo to the guide system, this automated overlapping mechanism not only greatly improves the forming efficiency, but also effectively avoids the risk of high-temperature burns and overlapping errors caused by manual operation, ensuring the safety and consistency of the production process; in addition, the embryo trajectory during the automatic overlapping process is more stable, which helps to form a corrugated profile with complete structure and uniform overlapping, thereby improving the forming quality and service life of the corrugated cooling tube from the source.

[0022] Optionally, the forming equipment also includes a cutting mechanism, which includes a sliding seat, a sliding drive member and a cutting member. The sliding seat is slidably arranged on the machine platform, and the sliding seat is located on the side of the guide frame away from the rotating drive member. The sliding drive member is fixed on the machine platform, and the output end of the sliding drive member is connected to the sliding seat. The cutting member is fixed on the sliding seat, and a collecting basket is provided under the machine platform. The cutting member can cut the produced corrugated cooling pipes.

[0023] By adopting the above technical solution, the cutting mechanism is arranged on the machine platform away from the tail end of the guide frame and close to the discharge position of the corrugated cooling tube. After the corrugated tube is formed, it can cooperate with the sliding drive member to drive the sliding seat to move, so that the cutting member can be flexibly moved at different positions and perform cutting operations. This structure can realize automatic cutting, avoiding the problems of corrugated tube deformation, burrs or tube wall flattening caused by traditional manual cutting, while improving the neatness and size consistency of the product; in addition, the cutting mechanism is linked to the collection basket, so that the cut tube scraps can automatically fall into the collection basket, which not only improves production efficiency, but also optimizes the material collection process to facilitate subsequent plastic recycling and steel wire scrap recycling, avoids material stacking chaos and manual sorting, and meets the needs of continuous and automated production.

[0024] In a third aspect, the present application further provides a molding process suitable for producing a plastic corrugated cooling pipe for automobiles, comprising the following steps: S1, the mixed plastic particles are fed into a first extruder to be heated and melted, and a strip-shaped embryo is extruded through a die. The molding equipment is then started to pull and shape the extruded embryo into a hollow, thin-walled inner tube; In step S2, the technician fixes the end of the steel wire on the forming equipment, and the forming equipment spirally winds the steel wire into an equal pitch around the inner tube; S3, feeding the mixed plastic granules into a second extruder for heating and melting, and the second extruder extruding a strip embryo through a die, and starting a molding device to pull the strip embryo extruded by the second extruder onto an inner tube wrapped with a steel wire; S4: As the forming equipment rotates continuously, the strip-shaped embryo completely covers the steel wire and fuses with the inner tube. The formed corrugated cooling tube continues to extend to one side as it rotates. The forming equipment first trims the wall thickness of the valley of the corrugated cooling tube. S5, the molding equipment then performs a wall thickness test on the preliminarily formed plastic corrugated cooling pipe. When it is detected that the wall thickness at the valley portion of the corrugated cooling pipe is thinning, the molding equipment will perform targeted repairs and adjustments to the wall thickness to make the wall thickness of the corrugated cooling pipe uniform.

[0025] By adopting the above-mentioned technical solution, combining multi-stage extrusion and winding, supplemented by overlap and wall thickness control mechanisms, the plastic embryo can stably cover the steel wire skeleton, ensuring the uniformity of the corrugated tube's molding. In particular, by setting up wall thickness detection and adjustment steps, the problem of uneven wall thickness in the overlap area is effectively overcome, thereby improving the quality stability and fatigue resistance of the corrugated cooling tube from the source.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The traction mechanism can provide stable wire traction and guiding accuracy during the winding process. The limit hole can firmly position the end of the wire, and the slide can move back and forth under the action of the screw rod. This can realize automatic traction and winding of the wire, reducing labor costs and reducing the impact of human error on product performance. Combined with the multiple sets of guide rods set on the guide frame, it effectively prevents the wire from slipping or deflecting at the beginning of winding, thereby improving the consistency of the spiral winding angle and pitch of the wire, and also improving the close fit and corrugation stability of the entire reinforcement layer during the molding process. It effectively reduces the misalignment between the outer wall of the inner tube and the steel wire, laying a uniform foundation for the subsequent outer plastic coating. 2. The mechanical interlocking structure between the limit block and the slide achieves reliable fixation and quick release of the wire end. Under the elastic force of the holding spring, the locking pin can be stably inserted into the locking hole of the plug-in part, effectively preventing the wire from loosening or dislocating during the winding process, ensuring the stability and repeatability of the wire winding starting point. The addition of a pressing rod automatically triggers the unlocking action when the slide moves to the predetermined position, and the wire end release operation can be completed without manual intervention. This significantly improves the automation level of the equipment and continuous production efficiency, reduces human operation errors, and helps to improve the consistency and structural stability of the finished product of the corrugated cooling tube. 3. Through the continuous contact between the abutment wheel and the valley of the corrugated cooling tube, it can sense in real time the slightest changes in the tube wall thickness in the valley area. When the wall thickness is uneven, the contact pressure between the valley and the abutment wheel changes, causing the deformation of the compression spring to change. The corresponding signal fluctuation is then detected by the pressure sensor, achieving continuous wall thickness detection of the corrugated cooling tube. This provides a real-time and reliable signal basis for the subsequent automatic compensation of the adjustment mechanism, significantly improving the intelligent and automated level of corrugated cooling tube wall thickness uniformity control, and effectively avoiding the low efficiency and data lag problems of traditional manual sampling or contact measurement methods. 4. The provided adjustment mechanism can be used to adjust the wall thickness of the corrugated cooling pipe in a targeted manner, that is, by introducing a polymer material with added photoinitiator into the adjustment mechanism, a targeted spraying and patching of the valley portion of the corrugated cooling pipe can be achieved, and a directional repair layer can be formed in the area where the wall thickness is insufficient; and a hot rolling roller is used to roll and distribute the excessive wall thickness at the center line of the overlap area to both sides, thereby avoiding the problem of unstable pipeline performance caused by local uneven thickness, effectively solving the structural weakness caused by insufficient wall thickness in the valley portion of the corrugated pipe, improving the overall uniformity and pressure resistance of the cooling pipe, and at the same time avoiding the risk of fatigue damage and leakage during use due to differences in wall thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a plastic corrugated cooling pipe for automobiles in an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the overall structure of the equipment for producing plastic corrugated cooling pipes in the embodiment of the present application.

[0029] Figure 3 It is a structural diagram of the molding equipment in the embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the overall structure of the overlapping mechanism and the guide frame in the embodiment of the present application.

[0031] Figure 5 It is a structural diagram of the traction mechanism in an embodiment of the present application.

[0032] Figure 6 It is a structural diagram of the adjustment mechanism in the embodiment of the present application.

[0033] Figure 7 yes Figure 6 Enlarged schematic diagram of part A.

[0034] Figure 8 It is a partial cross-sectional schematic diagram of the detection mechanism in the embodiment of the present application.

[0035] Figure numerals: 1, tube body; 11, inner layer; 12, reinforcement layer; 13, outer layer; 2, molding equipment; 21, machine; 211, controller; 212, bearing seat; 213, fixed seat; 214, mounting frame; 215, rotating frame; 216, collecting basket; 22, rotating drive member; 221, transmission shaft; 222, first fixed disk; 223, second fixed disk; 224, third fixed disk; 225, mounting sleeve; 23, guide frame; 231, molding cylinder; 232, guide rod; 24, traction mechanism; 241, reciprocating screw; 2411, extension rod; 242, transmission gear ; 243, gear ring; 244, slide; 2441, plug-in portion; 2442, locking hole; 2443, give way groove; 245, limit block; 2451, plug-in slot; 2452, receiving slot; 246, limit hole; 247, locking member; 2471, locking pin; 2472, abutting spring; 2473, pressing rod; 25, detection mechanism; 251, abutting wheel; 252, compression spring; 253, pressure sensor; 254, sliding cylinder; 255, sliding rod; 26, adjustment mechanism; 261, liquid storage tank; 262, infusion tube; 2621, nozzle; 263, curing lamp; 264. Scraper; 265. Scraping drive member; 27. Overlapping mechanism; 271. Driving gear; 272. Driven gear; 273. First motor; 274. Overlapping rod; 28. Cutting mechanism; 281. Sliding seat; 282. Sliding drive member; 283. Cutting member; 3. First extruder; 4. Second extruder. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail.

[0037] The embodiment of the present application discloses a plastic corrugated cooling pipe for an automobile.

[0038] Reference Figure 1 The plastic corrugated cooling pipe for automobiles is configured as an asymmetric corrugated structure formed by alternating peaks and valleys, and the tube body 1 of the plastic corrugated cooling pipe for automobiles is configured as a multi-layer structure, which is sequentially configured from the inside to the outside: an inner layer 11, a reinforcement layer 12 and an outer layer 13, wherein the inner layer 11 is configured as a thermally conductive modified nylon tube.

[0039] The reinforcement layer 12 is configured as a single high-carbon steel wire continuously spirally wound on the inner layer 11, and the steel wire is wound on the outer surface of the inner layer 11 with a winding angle a and a pitch. The winding angle is set to a, and a can be any degree between (60°~75°). The pitch S of the spiral winding of the steel wire and the diameter d of the steel wire satisfy the relationship S=kd, and k can be any constant between (8~12), wherein the surface of the steel wire is coated with a modified polyamide hot-melt treatment layer.

[0040] The larger the winding angle, that is, the closer the tangent direction of the steel wire winding position is to the axial direction of the inner tube, the better the axial flexibility can usually be provided, but the radial compressive strength will decrease accordingly; while a smaller winding angle can enhance the radial support force, but will limit the axial bending ability. According to the actual application of the plastic corrugated cooling pipe in the embodiment of the present application, that is, taking into account the bending and vibration of the vehicle during driving to maintain the flexibility of the pipe body, and at the same time sufficient radial support can withstand the pressure of the internal cooling medium, it is wound on the outer surface of the inner tube at equal distances with a winding angle of 60°~75°.

[0041] Pitch refers to the axial distance between two adjacent turns of wire. A larger pitch means the wire is wound more loosely, and vice versa. Setting the ratio of pitch to wire diameter ensures that the pitch adjustment remains proportional for wires of different diameters, thus maintaining structural consistency. For example, as the wire diameter increases, the pitch increases accordingly, avoiding the situation where a pitch that is too small will lead to an overly tight structure, affecting flexibility, or a pitch that is too large will lead to insufficient support.

[0042] The outer layer 13 is set as a weather-resistant thermoplastic polyurethane layer. The outer layer 13 is coated on the inner layer 11 wrapped with the reinforcement layer 12 to form a corrugated cooling pipe. The ratio of the corrugation depth H to the inner diameter D of the pipe body 1 is b, where the corrugation depth refers to the height from the peak to the valley of the corrugation. If the ratio H / D is too small, it may mean that the corrugation is not deep enough, affecting the flexibility and vibration absorption capacity of the pipeline; and if the ratio is too large, it may lead to insufficient structural strength, which is easy to deform or rupture under high pressure.

[0043] Automotive cooling systems often need to withstand the circulation of high-temperature coolant while also coping with the mechanical stresses of engine vibration and vehicle movement. Bellows must maintain excellent sealing and durability under these conditions. b can be a constant between 0.12 and 0.20, balancing flexibility and rigidity to ensure the pipe does not collapse when bent, while maintaining sufficient flow area and reducing fluid resistance.

[0044] The present application also discloses a molding process for a plastic corrugated cooling pipe for an automobile, comprising the following steps: S1, inner tube molding: the mixed plastic granules are fed into the first extruder 3 for heating and melting, and a strip-shaped embryo is extruded through a die. The molding device 2 is started to pull the extruded embryo into a hollow, thin-walled inner tube; S2, winding of the reinforcement layer 12, the technician fixes the end of the steel wire on the forming device 2, and the forming device 2 spirally winds the steel wire with equal pitch on the inner tube; S3, outer tube winding, the mixed plastic particles are fed into the second extruder 4 for heating and melting, the second extruder 4 extrude a strip embryo through a die, and the molding device 2 is started to pull the strip embryo extruded by the second extruder 4 onto the inner tube wound with the steel wire; S4, outer tube shaping: As the forming device 2 rotates continuously, the strip-shaped embryo completely covers the steel wire and fuses with the inner tube. The formed corrugated cooling tube will continue to extend to one side as it rotates. The forming device 2 will first trim the wall thickness of the valley of the corrugated cooling tube. S5, wall thickness detection, then the molding device 2 performs wall thickness detection on the preliminarily formed plastic corrugated cooling pipe. When it is detected that the wall thickness at the valley position of the corrugated cooling pipe is thinning, the molding device 2 will make targeted adjustments to the wall thickness to make the wall thickness of the corrugated cooling pipe uniform.

[0045] According to the above process, the present application also proposes a molding device for a plastic corrugated cooling pipe, referring to Figure 1 and Figure 3 The forming equipment 2 includes a machine table 21, a rotary driving member 22, a guide frame 23, a traction mechanism 24, a splicing mechanism 27, a detection mechanism 25, an adjustment mechanism 26 and a cutting mechanism 28. The rotary driving member 22 is installed on the machine table 21, the guide frame 23 is installed on the output end of the rotary driving member 22, the traction mechanism 24 is installed on the guide frame 23, the splicing mechanism 27, the detection mechanism 25, the adjustment mechanism 26 and the cutting mechanism 28 are all installed on the machine table 21, the splicing mechanism 27 is arranged between the guide frame 23 and the rotary driving member 22, the detection mechanism 25 is located on the side of the guide frame 23 away from the rotary driving member 22, the adjustment mechanism 26 is installed on one side of the detection mechanism 25, and the cutting mechanism 28 is installed on the side of the detection mechanism 25 away from the guide frame 23.

[0046] The machine 21 serves as the installation base of the entire molding equipment 2, and the rotating drive part 22 can drive the guide frame 23 to rotate, and the molten plastic of the two extruders is gradually wound into a pipe through the guide frame 23; the traction mechanism 24 can automatically wind the steel wire spirally onto the guide frame 23 with equal spacing, and automatically release the fixed limit of the steel wire at the end of the guide frame 23; the detection mechanism 25 can detect the wall thickness of the valley position on the corrugated cooling pipe; the adjustment mechanism 26 can make targeted wall thickness adjustments to the corrugated cooling pipe according to the real-time detection feedback of the detection mechanism 25, so that the wall thickness of the produced corrugated cooling pipe is evenly distributed; the cutting mechanism 28 can cut the formed corrugated cooling pipe to divide it into the length required for actual production.

[0047] Reference Figure 4 and Figure 5 In the embodiment of the present application, the first extruder 3 and the second extruder 4 are respectively arranged on both sides of the machine platform 21, and the first extruder 3 is located at one end of the length direction of the machine platform 21, and the second extruder 4 is located at the other end of the length direction of the machine platform 21. A controller 211 is installed on the machine platform 21, and a supporting seat 212 is fixed on the machine platform 21. The supporting seat 212 is located on the side of the machine platform 21 close to the first extruder 3.

[0048] The rotating drive member 22 is configured as a servo motor, and the rotating drive member 22 is fixed on the supporting plate. The rotating drive member 22 is electrically connected to the controller 211. A transmission shaft 221 is fixed on the output end of the rotating drive member 22, and the transmission shaft 221 is rotatably passed through the supporting seat 212. A bearing seat is also installed on the side of the supporting seat 212 away from the rotating drive member 22. The transmission shaft 221 is rotatably connected to the bearing seat, and the guide frame 23 is installed on the end of the transmission shaft 221 away from the supporting seat 212.

[0049] The guide frame 23 includes a guide rod 232 and a forming cylinder 231. A first fixed disc 222, a second fixed disc 223, and a third fixed disc 224 are fixedly mounted on the transmission shaft 221 along its axis. A counterweight disc is also fixed to the transmission shaft 221, located between the first fixed disc 222 and the bearing seat. The forming cylinder 231 is coaxially sleeved on the transmission shaft 221 and positioned between the first fixed disc 222 and the second fixed disc 223. One end of the forming cylinder 231 is fixedly connected to the first fixed disc 222, and the other end is fixedly connected to the second fixed disc 223. The machine platform 21 is equipped with multiple sets of first extrusion rollers, which are mounted on both sides of the forming cylinder 231 and arranged alternately. The first extrusion rollers are in active contact with the forming cylinder 231.

[0050] The guide rod 232 is disposed between the second fixed disk 223 and the third fixed disk 224. One end of the guide rod 232 is fixedly connected to the second fixed disk 223, and the other end is fixedly connected to the third fixed disk 224. In this embodiment, the guide rod 232 includes a fixed portion and a guide portion. The fixed portion is configured as a round rod, and the guide portion is configured as a double cone. The guide portion is coaxially fixed to the fixed portion and has a guide ring groove. The guide portion is provided with multiple groups of guide portions on the fixed portion, and the multiple groups of guide portions are arranged in an array on the fixed portion. Four groups of guide rods 232 are provided on the second fixed disk 223, and the four groups of guide rods 232 are distributed circumferentially around the transmission shaft 221 as the axis.

[0051] Reference Figure 4 and Figure 5In the embodiment of the present application, the traction mechanism 24 includes a reciprocating screw rod 241, a transmission gear 242, a gear ring 243, a slide 244, a limit block 245 and a locking member 247. A reel 245 wound with steel wire is provided on one side of the second extruder 4. The reel 245 unwinds the steel wire outward, and the surface of the steel wire is coated with a modified polyamide hot-melt treatment layer. The reciprocating screw rod 241 is arranged between the second fixed disk 223 and the third fixed disk 224. One end of the reciprocating screw rod 241 is rotatably passed through the second fixed disk 223, and the other end of the reciprocating screw rod 241 is rotatably connected to the third fixed disk 224. An extension rod 2411 is coaxially fixed to one end of the reciprocating screw rod 241 close to the second fixed disk 223. The extension rod 2411 is rotatably passed through the first fixed disk 222. A guide rod is also installed between the second fixed disk 223 and the third fixed disk 224. The guide rod is located below the reciprocating screw rod 241 and is not shown in the drawings of this embodiment.

[0052] The transmission gear 242 is fixed to the end of the extension rod 2411 away from the reciprocating screw rod 241, and a fixed seat 213 is fixed on the machine table 21. The fixed seat 213 is located between the counterweight plate and the first fixed plate 222. The transmission shaft 221 is rotatably connected to the fixed seat 213, and the gear ring 243 is fixed on the fixed seat 213 away from the rotating drive member 22. The transmission gear 242 is meshed with the gear ring 243. A sealing ring is also installed between the fixed seat 213 and the first fixed plate 222. The sealing ring separates the gear ring 243 from the external environment.

[0053] The slide 244 is arranged on the reciprocating screw rod 241, the slide 244 is threadedly connected to the reciprocating screw rod 241, and the slide 244 is slidably connected to the guide rod. The limit block 245 is arranged on the outer wall of the slide 244 through a hinge rotation, and a torsion spring is installed on the hinge. A first plug-in slot 2451 is provided on the side of the slide 244 away from the transmission shaft 221, and a second plug-in slot 2451 is provided on the side of the limit block 245 away from the transmission shaft 221. The first plug-in slot 2451 and the second plug-in slot 2451 can be combined to form a limit hole 246 for fixing the end of the steel wire.

[0054] The locking member 247 includes a locking pin 2471, a clamping spring 2472 and a pressing rod 2473. The limit block 245 is respectively provided with an insertion groove 2451 and a receiving groove 2452. The insertion groove 2451 is provided on the side of the limit block 245 that is in contact with the slide seat 244, and the receiving groove 2452 is provided on the side of the limit block 245 that faces the third fixed disk 224. The insertion groove 2451 and the receiving groove 2452 are cross-arranged.

[0055] The locking pin 2471 is slidably set in the accommodating groove 2452, and the tightening spring 2472 is set in the accommodating groove 2452. One end of the tightening spring 2472 is connected to one end of the locking pin 2471, and the other end of the tightening spring 2472 is connected to the inner wall of the accommodating groove 2452. A plug-in portion 2441 is fixed on the surface of the slide 244 that is in contact with the limit block 245. A locking hole 2442 and a give way groove 2443 are provided on the plug-in portion 2441. The give way groove 2443 is connected with the locking hole 2442, and the give way groove 2443 passes through the end of the plug-in portion 2441 that is away from the slide 244. The end of the locking pin 2471 away from the tightening spring 2472 is plugged into the locking hole 2442.

[0056] The pressing rod 2473 is fixed on the side of the third fixed plate 224 facing the second fixed plate 223, and the pressing rod 2473 is plugged into the accommodating groove 2452. The diameter of the pressing rod 2473 is smaller than the diameter of the locking pin 2471, and the diameter of the pressing rod 2473 is smaller than the width of the yield groove 2443.

[0057] More specifically, when the rotary drive member 22 drives the guide frame 23 to rotate, the transmission gear 242 engages and rotates in the gear ring 243, thereby causing the transmission gear 242 to drive the reciprocating screw rod 241 to rotate. At the beginning of the corrugated cooling tube forming, the limit block 245 is engaged on the slide 244, and the end of the steel wire is inserted into the limit hole 246. As the guide frame 23 rotates, the steel wire can be spirally wound on the guide frame 23. When the slide 244 moves to the third fixed disk 224, the pressing rod 2473 is inserted into the receiving groove 2452. The end of the pressing rod 2473 away from the third fixed disk 224 squeezes the locking pin 2471 out of the locking hole 2442. Under the action of the torsion spring, the limit block 245 swings to the side away from the slide 244, and the pressing rod 2473 slides out of the clearance groove 2443, thereby releasing the fixed limit on one end of the steel wire.

[0058] Reference Figure 4 In the embodiment of the present application, the overlapping mechanism 27 includes a driving gear 271, a driven gear 272, a first motor 273 and a overlapping rod 274. A rotating frame 215 is fixed on the machine 21, and the rotating frame 215 is sleeved on the transmission shaft 221. The rotating frame 215 is located on the side of the forming cylinder 231 close to the rotating driving member 22. The driven gear 272 is sleeved on the transmission shaft 221. The first motor 273 is fixed on the mounting frame 214. The first motor 273 can also be set as a servo motor. The first motor 273 is electrically connected to the controller 211. The driving gear 271 is fixed on the output end of the first motor 273. The driving gear 271 is meshed with the driven gear 272. One end of the overlapping rod 274 is fixed on the side of the driven gear 272 away from the rotating frame 215. The overlapping rod 274 is arranged parallel to the transmission shaft 221, and the end of the overlapping rod 274 away from the driven gear 272 is close to the third fixed disk 224.

[0059] Reference Figure 6 、 Figure 7 and Figure 8 In the embodiment of the present application, the detection mechanism 25 includes a sliding cylinder 254, a sliding rod 255, an abutting wheel 251, a compression spring 252 and a pressure sensor 253. A mounting sleeve 225 is fixedly provided on the surface of the third fixed disk 224 facing away from the second fixed disk 223. A mounting frame 214 is provided on the machine 21. The mounting frame 214 is configured as a door-shaped frame. The mounting frame 214 is mounted above the mounting sleeve 225. The sliding cylinder 254 is configured as a quadrangular prism cylinder with an open end. One end of the sliding cylinder 254 is fixed on the mounting frame 214. The open end of the sliding cylinder 254 faces the mounting sleeve 225. One end of the sliding rod 255 is slidably arranged in the sliding cylinder 254. A rotating seat is fixed on the end of the sliding rod 255 facing away from the sliding cylinder 254. The abutting wheel 251 is rotatably arranged on the rotating seat. The abutting wheel 251 is movably abutted against the valley position of the corrugated cooling pipe.

[0060] The compression spring 252 and pressure sensor 253 are both disposed within the sliding cylinder 254. The pressure sensor 253 is fixedly embedded in the inner bottom wall of the sliding cylinder 254 and electrically connected to the controller 211. One end of the compression spring 252 is connected to the pressure sensor 253, while the other end is fixedly connected to one end of the sliding rod 255. Initially, the compression spring 252 is compressed. If the wall thickness at the valley is uniform, the pressure applied to the pressure sensor 253 should be a fixed value. An increase in the force applied to the pressure sensor 253 indicates a thickening of the wall at that location; conversely, a decrease in the force applied to the pressure sensor 253 indicates a thinning of the wall at that location. In this embodiment, three groups of detection mechanisms 25 are provided. The three groups of detection mechanisms 25 are arranged in a row on the mounting frame 214, and each group of abutment wheels 251 deflects toward the direction of rotation of the corrugated cooling tube.

[0061] Reference Figure 6 and Figure 7In the embodiment of the present application, the regulating mechanism 26 includes a liquid storage tank 261, a liquid infusion tube 262, a curing lamp 263, a scraper 264 and a scraping drive 265. The liquid storage tank 261 is fixed on the machine 21. The liquid storage tank 261 is injected with a polyurethane prepolymer. The polyurethane prepolymer is mixed with a photoinitiator and a reactive diluent. A pressure pump is installed on the liquid storage tank 261. The pressure pump is electrically connected to the controller 211. The input end of the pressure pump is connected to the liquid storage tank 261. The liquid infusion tube 263 is connected to the liquid storage tank 261. One end of the infusion tube 262 is connected to the output end of the pressure pump, and the other end of the infusion tube 262 is provided with a nozzle 2621. The nozzle 2621 is fixedly mounted on the mounting frame 214 and is located on one side of the abutting wheel 251. The spray direction of the nozzle 2621 is toward the abutment position between the abutting wheel 251 and the corrugated cooling tube. The curing lamp 263 is fixedly mounted on the mounting frame 214 and is located on the side of the abutting wheel 251 away from the extruder. In this embodiment, the curing lamp 263 is configured as a UV lamp.

[0062] The curing lamp 263 acts on the photoinitiator added to the polyurethane prepolymer, thereby initiating a chain polymerization reaction between the polyurethane prepolymer and the active monomer, thereby causing the polyurethane prepolymer to cure quickly to fill the thinning position of the upper valley wall.

[0063] The scraper 264 is tilted and arranged on the mounting frame 214. The scraper 264 is located on the side of the abutment wheel 251 close to the guide frame 23. A connecting rod is fixed at one end of the scraper 264. The connecting rod is slidably passed through the mounting frame 214, and the scraper 264 is tangent to the valley position of the corrugated cooling pipe. The scraper 264 is fixedly connected to the output end of the scraping drive 265 through the connecting rod. The scraping drive 265 can be set as a piezoelectric transducer. The scraping drive 265 and the scraper 264 are combined to form an ultrasonic cutting knife used for the initially formed corrugated cooling pipe. The scraping drive 265 is electrically connected to the controller 211 and is fixed on the mounting frame 214.

[0064] More specifically, under normal conditions, the wall thickness of the valley portion of the corrugated cooling tube is uniform, and at this time, the movement of the abutment wheel 251 along the radial direction of the mounting sleeve 225 is stable, which means that the force exerted on the pressure sensor 253 is also stable; however, the corrugated cooling tube is very likely to cause the winding trajectory to deviate due to rotational inertia and extruder discharge fluctuations, resulting in uneven distribution of the wall thickness in the overlap area. Then, three situations will occur in the overlap area. The first is that the winding trajectory is correct and the wall thickness in the overlap area is uniformly distributed; the second is that the winding trajectory deviates toward the discharge direction of the corrugated cooling tube. At this time, the wall thickness in the overlap area will be normal on both sides of the overlap area, while the wall thickness in the center line of the overlap area will become thinner; the third is that the winding trajectory deviates toward the forming direction of the corrugated cooling tube. At this time, the wall thickness in the overlap area will become thinner on both sides of the overlap area, while the wall thickness in the center line of the overlap area will become thicker.

[0065] Three groups of abutment wheels 251 are provided for testing, one for each side of the overlap zone and the other for the middle. Therefore, the corresponding three groups of pressure sensors 253 are configured as the first, second, and third detection groups. When the value of the second detection group decreases and the values ​​of the first and third detection groups stabilize, the controller 211 activates the pressure pump, spraying polyurethane prepolymer through the nozzle toward the centerline of the overlap zone. Simultaneously, the curing lamp 263 is activated to rapidly cure the prepolymer, filling the gaps in the wall thickness. A scraper 264 is provided to first trim the valley, scraping off any excess wall thickness. The valley is then further inspected for any thinning issues. Targeted repairs are then made to the thinned areas, thereby adjusting the wall thickness of the overlap zone (valley).

[0066] Reference Figure 3 In the embodiment of the present application, the cutting mechanism 28 includes a sliding seat 281, a sliding drive member 282, and a cutting member 283. The sliding seat 281 is slidingly arranged on the side of the machine 21 away from the supporting seat 212. The sliding drive member 282 is fixed on the machine 21. The sliding drive member 282 is set as an electric push rod. The sliding drive member 282 is electrically connected to the controller 211. The output end of the sliding drive member 282 is connected to the sliding seat 281. The cutting member 283 is fixed on the sliding seat 281. The cutting member 283 is set as an electric pipe cutting machine. The cutting machine is electrically connected to the controller 211. A collecting basket 216 is provided under the machine 21, and the collecting basket 216 is located below the cutting member 283.

[0067] At the same time, a crawler-type tractor for pulling and discharging the corrugated cooling tubes is installed on the side of the machine 21 away from the rotating drive member 22. A certain distance is reserved between the crawler-type tractor and the machine 21. In addition to being used to separate the corrugated cooling tubes into finished products, the cutting machine can also cut off transitional products in production and drop them into a collection basket 216. Transitional products, such as corrugated cooling tubes that have just been produced, can be collected in the collection basket 216 and the plastic and steel wire therein can be sorted and recycled in subsequent production, especially the plastic scraps, thereby reducing some production costs and improving production efficiency. The crawler-type tractor is not shown in the drawings of this embodiment.

[0068] The implementation principle of the automotive plastic corrugated cooling tube and its molding process according to the embodiment of the present application is as follows: first, the first extruder 3 is started, mixed plastic granules are fed into the first extruder 3 for heating and melting, and a strip embryo is extruded through a die. Then, the first motor 273 is started to drive the connecting rod 274 to deflect from the first extruder 3 to the second extruder 4. The connecting rod 274 connects the extruded strip embryo to the molding cylinder 231. The controller 211 controls the guide frame 23 to rotate, so that the embryo forms an inner tube on the molding cylinder 231. Subsequently, the technician inserts the end of the steel wire into the limiting hole 246, and the steel wire is spirally wound around the inner tube as the guide frame 23 rotates. At this time, the lap rod 274 is just deflected above the steel wire, and when the slide 244 moves to the third fixed disk 224, the limiting hole 246 automatically releases the limit on the end of the steel wire; the mixed plastic particles are put into the second extruder 4 for heating and melting, and the second extruder 4 extrudes a strip embryo through the die, and then the controller 211 starts the first motor 273 to continue to deflect, and the lap rod 274 covers the extruded strip embryo on the inner tube wrapped with the steel wire. As the guide frame 23 continues to rotate, the extrusion roller cooperates to ensure that the strip embryo completely covers the steel wire and merges with the inner tube, so that the outer ring shape of the plastic corrugated cooling tube is initially fixed; The corrugated cooling pipe with preliminary formation is moved to the end of the guide frame 23, and the scraper 264 first scrapes and reshapes the outer wall of the corrugated cooling pipe, and then uses the abutment wheel 251 and the installation sleeve 225 to detect the wall thickness of the preliminarily formed plastic corrugated cooling pipe. When the detection mechanism 25 detects that the wall thickness of the corrugated cooling pipe is uneven, the adjustment mechanism 26 set on the molding equipment 2 will make targeted adjustments to the wall thickness to make the wall thickness of the corrugated cooling pipe uniform.

[0069] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A plastic corrugated cooling pipe for automobile, characterized in that: include: A tube body having an asymmetric corrugated structure formed by alternately arranged peaks and valleys; The tube body is configured from inside to outside in sequence as follows: An inner layer, wherein the inner layer is configured as a thermally conductive modified nylon tube; The reinforcement layer is configured as a single high-carbon steel wire continuously spirally wound structure, the steel wire being wound around the outer surface of the inner layer at a winding angle a and a constant pitch, wherein the pitch S of the spiral winding of the steel wire and the diameter d of the steel wire satisfy the relationship S=kd, where k is set to a constant; wherein the surface of the steel wire is coated with a modified polyamide hot-melt treatment layer; The outer layer is configured as a weather-resistant thermoplastic polyurethane layer, and the outer layer is coated on the inner layer wrapped with the reinforcement layer to form a corrugated cooling pipe, and the ratio of the corrugation depth H to the inner diameter D of the pipe body is b, wherein the corrugation depth refers to the height from the peak to the valley of the corrugation.

2. A molding device for a plastic corrugated cooling pipe for automobiles, used for producing the plastic corrugated cooling pipe for automobiles according to claim 1, characterized in that: The machine comprises a platform, a rotary drive member and a guide frame, wherein the platform is arranged on one side of the discharge port of the first extruder, a controller is arranged on the platform, a bearing seat is fixed on the platform, the rotary drive member is fixed on the bearing seat, the rotary drive member is electrically connected to the controller, a transmission shaft is fixed on the output end of the rotary drive member, and the guide frame is fixedly sleeved on the transmission shaft; The guide frame includes a guide rod and a forming cylinder, and the transmission shaft is fixed with a first fixed disk, a second fixed disk and a third fixed disk in sequence. The forming cylinder is sleeved on the transmission shaft, and the forming cylinder is located between the first fixed disk and the second fixed disk. One end of the forming cylinder is fixedly connected to the first fixed disk, and the other end of the forming cylinder is fixedly connected to the second fixed disk. The guide rod is arranged between the second fixed disk and the third fixed disk, one end of the guide rod is connected to the second fixed disk, and the other end of the guide rod is connected to the third fixed disk. There are multiple groups of guide rods on the transmission shaft, and the multiple groups of guide rods are distributed circumferentially with the transmission shaft as the axis.

3. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 2, characterized in that: The cam is fixedly mounted on the support frame, and the cam is connected to the support frame by the second end face having the first end fixed to the support frame and the second end face having the first end fixed to the support frame.

4. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 3, characterized in that: The slide is also provided with a locking piece, which includes a locking pin, a tightening spring and a pressing rod, and the limit block is respectively provided with an inserting slot and a receiving slot, and the inserting slot and the receiving slot are cross-arranged, and the slide is fixed with an inserting portion, and a locking hole and a giving slot are respectively provided on the inserting portion, and the giving slot is communicated with the locking hole, and the giving slot passes through an end of the slide that is away from the inserting portion, and the locking pin and the tightening spring are both slidably arranged in the receiving slot, one end of the tightening spring is connected to one end of the locking pin, and the other end of the tightening spring is connected to the receiving slot. The inner wall is connected, and one end of the locking pin is away from the tightening spring and is plugged into the locking hole, and the diameter of the locking pin is larger than the width of the give way groove. The pressing rod is fixed on the side of the third fixed plate close to the second fixed plate, and the diameter of the pressing rod is smaller than the width of the give way groove. The pressing rod is plugged into the accommodating groove. When the slide moves to one side of the third fixed plate, the pressing rod is inserted into the accommodating groove, and one end of the pressing rod pushes one end of the locking pin out of the locking hole, thereby causing the limit block to swing to one side, thereby releasing the fixed limit on one end of the steel wire.

5. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 2, characterized in that: The molding equipment also includes a detection mechanism, which includes an abutment wheel, a compression spring and a pressure sensor. A mounting sleeve is fixedly provided on the side of the third fixed disk facing away from the second fixed disk. A mounting bracket is provided on the machine platform. A sliding cylinder is fixedly provided on the mounting bracket. A sliding rod is slidingly provided in the sliding cylinder. The compression spring and the pressure sensor are both arranged in the sliding cylinder. The pressure sensor is fixedly embedded in the inner wall of the sliding cylinder. The pressure sensor is electrically connected to the controller. One end of the compression spring is connected to the pressure sensor, and the other end of the compression spring is fixedly connected to one end of the sliding rod. A rotating seat is fixedly provided on the end of the sliding rod away from the compression spring. The abutment wheel is rotatably set on the rotating seat. The abutment wheel is movably abutted against the valley position of the corrugated cooling pipe. When the wall thickness of the valley position is uneven, the pressure sensor will experience obvious fluctuations due to the force of the compression spring.

6. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 5, characterized in that: The molding equipment also includes an adjustment mechanism, which includes a liquid storage tank, an infusion tube and a curing lamp. The liquid storage tank is fixedly mounted on the machine platform, and a polymer material added with a photoinitiator is injected into the liquid storage tank. A nozzle is provided at one end of the infusion tube, and the other end of the infusion tube is connected to the liquid storage tank. The nozzle is fixedly mounted on the mounting frame, and the nozzle is located on one side of the abutting wheel. The nozzle sprays toward the abutment position between the abutting wheel and the corrugated cooling tube. The curing lamp is fixed on the mounting frame, and the curing lamp is located on the side of the abutting wheel away from the guide frame. When the force applied to the pressure sensor decreases, the nozzle sprays the polymer material to the corresponding position of the valley to fill it.

7. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 6, characterized in that: The adjustment mechanism also includes a scraper and a scraping drive. The scraper is tilted on the mounting frame. The scraper is located on the side of the abutment wheel close to the guide frame. A connecting rod is fixed to one end of the scraper. The connecting rod is slidably passed through the mounting frame, and the scraper is tangent to the valley of the corrugated cooling pipe. The scraping drive is electrically connected to the controller and fixed on the mounting frame. The scraper is fixedly connected to the output end of the scraping drive through the connecting rod.

8. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 6, characterized in that: The molding equipment also includes a lap joint mechanism, which includes a driving gear, a driven gear, a first motor and a lap joint rod. A rotating frame is fixedly provided on the machine platform, the rotating frame is sleeved on the transmission shaft, the rotating frame is located on the side of the molding cylinder close to the rotating drive member, the driven gear is sleeved on the transmission shaft, the first motor is fixed on the mounting frame, the first motor is electrically connected to the controller, the driving gear is fixed on the output end of the first motor, the driving gear is meshed with the driven gear, the lap joint rod is fixed on the driven gear, the lap joint rod is arranged parallel to the transmission shaft, and the end of the lap joint rod away from the driven gear is close to the third fixed disk.

9. The molding equipment for a plastic corrugated cooling pipe for automobile according to claim 2, characterized in that: The forming equipment also includes a cutting mechanism, which includes a sliding seat, a sliding drive member and a cutting member. The sliding seat is slidably arranged on the machine platform. The sliding seat is located on the side of the guide frame away from the rotating drive member. The sliding drive member is fixed on the machine platform. The output end of the sliding drive member is connected to the sliding seat. The cutting member is fixed on the sliding seat. A collection basket is provided under the machine platform. The cutting member can cut the produced corrugated cooling pipes.

10. A molding process for a plastic corrugated cooling pipe for automobiles according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1, the mixed plastic particles are fed into a first extruder to be heated and melted, and a strip-shaped embryo is extruded through a die. The molding equipment is then started to pull and shape the extruded embryo into a hollow, thin-walled inner tube; In step S2, the technician fixes the end of the steel wire on the forming equipment, and the forming equipment spirally winds the steel wire into an equal pitch around the inner tube; S3, feeding the mixed plastic granules into a second extruder for heating and melting, and the second extruder extruding a strip embryo through a die, and starting a molding device to pull the strip embryo extruded by the second extruder onto the inner tube wrapped with steel wire; S4: As the forming equipment rotates continuously, the strip-shaped embryo completely covers the steel wire and fuses with the inner tube. The formed corrugated cooling tube continues to extend to one side as it rotates. The forming equipment first trims the wall thickness of the valley of the corrugated cooling tube. S5, the molding equipment then performs a wall thickness test on the preliminarily formed plastic corrugated cooling pipe. When it is detected that the wall thickness at the valley portion of the corrugated cooling pipe is thinning, the molding equipment will perform targeted repairs and adjustments to the wall thickness to make the wall thickness of the corrugated cooling pipe uniform.

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