Plastic corrugated cooling pipe for automobile and its forming equipment

Abstract

The application relates to the technical field of corrugated cooling pipe manufacturing, and particularly discloses a plastic corrugated cooling pipe for automobiles, which comprises a pipe body, the pipe body has an asymmetric corrugated structure formed by alternately arranged peak portions and valley portions; the pipe body is sequentially provided from inside to outside as follows: an inner layer is provided as a heat-conducting modified nylon pipe; a reinforcing layer is provided as a single high-carbon steel wire continuous spiral winding structure, and the steel wire surface is coated with a modified polyamide hot melting treatment layer; and an outer layer is provided as a weather-resistant thermoplastic polyurethane layer, the outer layer is coated on the inner layer with the reinforcing layer wound thereon to form the corrugated cooling pipe. The application has the effects of improving the pressure resistance and fatigue resistance of the corrugated cooling pipe, and improving the overall sealing performance and long-term reliability.

Description

Technical Field

[0001] This application relates to the field of corrugated cooling pipe manufacturing technology, and in particular to a plastic corrugated cooling pipe for automobiles and its molding equipment. Background Technology

[0002] With the advancement of automotive lightweighting and energy conservation trends, plastic corrugated cooling pipes, due to their advantages of light weight, corrosion resistance, and high flexibility, have gradually replaced traditional metal pipes and are widely used in automotive cooling, fuel, and exhaust systems. Among them, steel wire reinforced plastic corrugated hoses, due to their combination of high pressure resistance, deformation resistance, and bendability, have become a core component of cooling pipelines. These pipes are typically manufactured using a spiral winding process, where molten plastic is evenly wound around the surface of a rotating steel wire skeleton, and after cooling and setting, a corrugated structure is formed. However, as the requirements for pipeline sealing, fatigue resistance, and long-term reliability in automotive cooling systems become increasingly stringent, defects in the molding process are gradually becoming key bottlenecks restricting product performance improvement.

[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 used due to its high production efficiency and low equipment cost. Its core process is: molten plastic is spirally wound onto a steel wire skeleton through an extruder head, and the corrugated profile is formed by pressing with a mold. For example, Chinese patent CN119458841A in related technologies proposes an exhaust corrugated pipe extrusion manufacturing equipment. The raw material is heated and plasticized into a plastic sheet through an extrusion device, and then wound with steel wire conveyed by an unwinding device in a mold device to form a corrugated pipe. After forming, the 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). Subsequently, the clamping components (first / second clamping parts and inserts) are precisely inserted into the troughs of the corrugated pipe, and the moving drive component pushes the corrugated pipe to compress and fold, shortening its length for storage. The compressed corrugated pipe slides into the receiving box by an inclined pouring 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 wound to cover the steel wire skeleton, the corrugated cooling pipe is prone to deviation of the winding trajectory due to rotational inertia and extruder discharge fluctuations in the overlapping area of ​​adjacent winding layers (i.e., the overlap area). This results in uneven wall thickness distribution in the overlap area, which significantly reduces the fatigue resistance of the corrugated cooling pipe and causes internal stress concentration in the subsequent cooling and shaping stage, leading to pipe wall cracks or sealing failure. Once the corrugated cooling pipe is under high temperature and high pressure conditions, the area of ​​sudden wall thickness change is prone to become a weak point for leakage or pipe burst, seriously threatening the stability of the automotive cooling system. Summary of the Invention

[0005] This application provides a corrugated plastic cooling pipe for automobiles and its molding equipment. The corrugated plastic cooling pipe for automobiles has excellent comprehensive performance. At the same time, the molding equipment for the corrugated plastic cooling pipe for automobiles can not only greatly improve the production efficiency of the corrugated cooling pipe, but also address the uneven wall thickness distribution that occurs during production, ensuring the overall quality and production stability of the corrugated cooling pipe.

[0006] Firstly, the technical solution of the automotive plastic corrugated cooling pipe provided in this application is as follows:

[0007] A corrugated plastic cooling pipe for automobiles, comprising:

[0008] The tube body has an asymmetric corrugated structure formed by alternating peaks and valleys;

[0009] The tube body is configured from the inside out as follows:

[0010] Inner layer, wherein the inner layer is configured as a thermally conductive modified nylon tube;

[0011] The reinforcing layer is configured as a single high-carbon steel wire continuously spirally wound structure. The steel wire is wound on the outer surface of the inner layer with a constant pitch at a winding angle α. 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 as a constant. The surface of the steel wire is covered with a modified polyamide hot-melt treatment layer.

[0012] The outer layer is a weather-resistant thermoplastic polyurethane layer, which covers the inner layer with a reinforcing layer to form a corrugated cooling pipe. The ratio of the corrugation depth H to the inner diameter D of the pipe is b, where the corrugation depth refers to the height from the peak to the valley of the corrugation.

[0013] By adopting the above technical solution, the plastic corrugated cooling pipe adopts an asymmetric corrugated structure and a layered structure. The inner layer of thermally conductive nylon improves the heat transfer efficiency, 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, and the hot melt coating layer improves the bonding strength between the steel wire and the plastic layer, which helps to improve the overall sealing performance and long-term reliability. The outer layer uses weather-resistant polyurethane material to enhance aging resistance and environmental adaptability.

[0014] Secondly, this application provides a molding equipment for automotive plastic corrugated cooling pipes, with the following technical solution:

[0015] A molding device for automotive plastic corrugated cooling pipes includes a machine base, a rotary drive, and a guide frame. The machine base is located on one side of the discharge port of a first extruder. A controller is mounted on the machine base, and a support seat is fixed on the machine base. The rotary drive is fixed on the support seat and electrically connected to the controller. A drive shaft is fixed on the output end of the rotary drive, and the guide frame is fixedly sleeved on the drive shaft.

[0016] The forming frame includes a forming rod and a forming cylinder. A first fixed plate, a second fixed plate, and a third fixed plate are sequentially fixed on the drive shaft at intervals. The forming cylinder is sleeved on the drive shaft and is located between the first fixed plate and the second fixed plate. One end of the forming cylinder is fixedly connected to the first fixed plate, and the other end of the forming cylinder is fixedly connected to the second fixed plate. The forming rod is disposed between the second fixed plate and the third fixed plate. One end of the forming rod is connected to the second fixed plate, and the other end of the forming rod is connected to the third fixed plate. Multiple sets of the forming rod are arranged on the drive shaft, and the multiple sets of the forming rod are circumferentially distributed with the drive shaft as the axis.

[0017] By adopting the above technical solution, the first to third fixed discs and the spaced forming cylinders and guide rods inside the forming frame ensure that the inner tube can be stably guided and shaped during the forming process. The multiple sets of guide rods ensure the uniformity of wire winding and the consistency of winding angle. At the same time, the multiple sets of guide rods are distributed in a ring around the drive shaft, which can provide multi-angle and multi-point support and guidance for the inner tube, prevent the inner tube from deviating or twisting, improve the forming accuracy and the synchronization of equipment operation, provide a good foundation for the subsequent outer layer material covering, and effectively improve the overall forming quality and production efficiency of the corrugated pipe.

[0018] Optionally, the molding equipment further includes a traction mechanism, which comprises a reciprocating lead screw, a transmission gear, a gear ring, a slide block, and a limiting block. The reciprocating lead screw is disposed between the second fixed plate and the third fixed plate. One end of the reciprocating lead screw rotatably passes through the second fixed plate, and the other end of the reciprocating lead screw is rotatably connected to the third fixed plate. An extension rod is fixedly provided at the end of the reciprocating lead screw near the second fixed plate. The extension rod rotatably passes through the first fixed plate, and the transmission gear is fixedly disposed on the extension rod away from the first fixed plate. At one end of the reciprocating lead screw, a fixed seat is fixedly provided on the machine base, the fixed assembly is located on the side of the first fixed plate away from the forming cylinder, the gear ring is fixedly provided on the fixed seat, and the transmission gear meshes with the gear ring; the slide is provided on the reciprocating lead screw, the slide is threadedly connected to the reciprocating lead screw, the limiting block is rotatably provided on the slide, the slide has a first insertion groove, the limiting block has a second insertion groove, and the first insertion groove and the second insertion groove can be combined to form a limiting hole for fixing the end of the steel wire.

[0019] By adopting the above technical solution, the traction mechanism uses a combination of multiple structures including a reciprocating screw, a slide block, and a limiting block, which can provide stable wire traction force and guiding accuracy during the winding process. The limiting hole formed by the combination of the first and second insertion slots can firmly position the end of the wire, while the slide block can reciprocate under the action of the screw, thus achieving automatic wire traction and winding, reducing labor costs and minimizing the impact of human error on product performance. Furthermore, the multiple sets of guiding rods on the guiding frame effectively prevent slippage or deviation of the wire during initial winding, thereby improving the consistency of the wire spiral winding angle and pitch, enhancing the tightness and corrugation stability of the entire reinforcing layer during the forming process, and effectively reducing misalignment between the inner tube outer wall and the wire, laying a uniform foundation for subsequent outer plastic coating.

[0020] Optionally, the slide block is further provided with a locking element, which includes a locking pin, a retaining spring, and a pressing rod. The limiting block has a insertion slot and a receiving slot respectively, the insertion slot and the receiving slot being arranged intersectingly. The slide block has a fixed insertion part, which has a locking hole and a clearance slot respectively. The clearance slot communicates with the locking hole, and the clearance slot extends through to one end of the insertion part away from the slide block. The locking pin and the retaining spring are both slidably disposed within the receiving slot. One end of the retaining spring is connected to one end of the locking pin, and the other end of the retaining spring is connected to the receiving slot. The inner wall of the receiving groove is connected, and the end of the locking pin away from the clamping spring is inserted into the locking hole. The diameter of the locking pin is larger than the width of the relief groove. The pressing rod is fixed on the side of the third fixed plate near the second fixed plate. The diameter of the pressing rod is smaller than the width of the relief groove. The pressing rod is inserted 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. One end of the pressing rod pushes one end of the locking pin out of the locking hole, thereby causing the limiting block to swing to one side, thereby releasing the fixed limitation on one end of the steel wire.

[0021] By adopting the above technical solution, a mechanical interlocking structure is set between the limit block and the slide to achieve reliable fixing and rapid release of the end of the steel wire. Under the elastic force of the clamping spring, the locking pin can be stably inserted into the locking hole of the insertion part, effectively preventing the steel wire from loosening or dislodging 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 enables the unlocking action to be automatically triggered when the slide moves to the predetermined position, and the steel wire end release operation can be completed without manual intervention. This significantly improves the automation level and continuous production efficiency of the equipment, reduces human operation errors, and helps to improve the finished product consistency and structural stability of the corrugated cooling pipe.

[0022] Optionally, the molding equipment further includes a detection mechanism, which includes an abutment wheel, a compression spring, and a pressure sensor. A mounting sleeve is fixed to the side of the third fixed plate facing away from the second fixed plate. A mounting frame is provided on the machine base, and a sliding cylinder is fixed to the mounting frame. A sliding rod is slidably disposed inside the sliding cylinder. The compression spring and the pressure sensor are both disposed inside the sliding cylinder. The pressure sensor is fixedly embedded in the inner wall of the sliding cylinder and 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 to the end of the sliding rod away from the compression spring. The abutment wheel is rotatably disposed on the rotating seat. The abutment wheel movably abuts against the valley of the corrugated cooling pipe. When the wall thickness at the valley is uneven, the pressure sensor will experience significant fluctuations due to the force exerted by the compression spring.

[0023] By adopting the above technical solution, and utilizing components such as the contact wheel, sliding rod, compression spring, and pressure sensor, the contact wheel continuously contacts the valley of the corrugated cooling pipe, enabling real-time sensing of minute changes in the pipe wall thickness in the valley region. When the wall thickness is uneven, the contact pressure between the valley and the contact wheel changes, causing a change in the deformation of the compression spring. The pressure sensor then detects the corresponding signal fluctuation, achieving continuous wall thickness detection of the corrugated cooling pipe. This detection method not only has high sensitivity recognition but also features fast response, accurate feedback, and adaptability to the periodic changes in the corrugated structure. It provides a real-time and reliable signal basis for subsequent automatic compensation by the adjustment mechanism, significantly improving the intelligence and automation level of the wall thickness uniformity control of the corrugated cooling pipe, and effectively avoiding the low efficiency and data lag problems of traditional manual sampling or contact measurement methods.

[0024] Optionally, the molding equipment further includes an adjustment mechanism, which includes a storage tank, an infusion pipe, and a curing lamp. The storage tank is fixed on the machine base and contains a polymer material with an added photoinitiator. One end of the infusion pipe is equipped with a nozzle, and the other end of the infusion pipe is connected to the storage tank. The nozzle is fixedly mounted on the mounting frame and is located on one side of the abutment wheel. The nozzle sprays towards the abutment wheel and the corrugated cooling pipe abutment position. The curing lamp is fixed on the mounting frame and is located on the side of the abutment wheel away from the guide frame. When the force on the pressure sensor decreases, the nozzle sprays polymer material onto the corresponding position of the valley to fill it.

[0025] By adopting the above technical solution, a polymer material with added photoinitiator is introduced into the adjustment mechanism to achieve targeted spraying of material at the valley of the corrugated cooling pipe, forming a directional repair layer in areas with insufficient wall thickness. Further, the sprayed material is photocured by a curing lamp, allowing the repair layer to quickly solidify and form a good bond with the original pipe structure. This method requires no overall heating, does not damage the original structure, and features rapid response, localized 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 fatigue damage and leakage risks during use due to differences in wall thickness.

[0026] Optionally, the adjustment mechanism further includes a scraper and a scraping drive. The scraper is obliquely mounted on the mounting frame and is located on the side of the abutment wheel near the guide frame. A connecting rod is fixedly mounted on one end of the scraper, and the connecting rod slides through the mounting frame. The scraper is tangentially positioned to the valley of the corrugated cooling pipe. The scraping drive is electrically connected to the controller and is fixedly mounted on the mounting frame. The scraper is fixedly connected to the output end of the scraping drive via the connecting rod.

[0027] By adopting the above technical solution, a scraper and scraping drive are added to the adjustment mechanism, which can pre-treat the valley position before the corrugated cooling pipe enters the wall thickness detection process, accurately scraping away the excessively thick plastic material in some areas, thereby avoiding detection misjudgment or material redundancy in subsequent processing. This structure makes the wall thickness adjustment work more efficient and targeted, only needing to compensate for the thinner areas, improving the overall adjustment efficiency, saving the amount of polymer repair material, and significantly improving molding accuracy and appearance consistency.

[0028] Optionally, the molding equipment further includes an overlapping mechanism, which includes a driving gear, a driven gear, a first motor, and an overlapping rod. A rotating frame is fixed on the machine base and sleeved on the transmission shaft. The rotating frame is located on the side of the molding cylinder near the rotary drive member. The driven gear is sleeved on the transmission shaft. The first motor is fixed on the mounting frame and electrically connected to the controller. The driving gear is fixed on the output end of the first motor and meshes with the driven gear. The overlapping rod is fixed on the driven gear and is arranged parallel to the transmission shaft. The end of the overlapping rod away from the driven gear is close to the third fixed plate.

[0029] By adopting the above technical solution, the overlapping mechanism, through the transmission of the active and driven gears, drives the overlapping rod to rotate synchronously, which can realize the automatic traction of the strip-shaped preform, ensuring that the preform is quickly and accurately attached to the guide frame. Compared with the traditional operation of manually pulling the high-temperature preform to the guiding system, this automated overlapping mechanism not only greatly improves the molding 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 trajectory of the preform during the automatic overlapping process is more stable, which helps to form a corrugated profile with complete structure and uniform overlap, improving the molding quality and service life of the corrugated cooling tube from the source.

[0030] Optionally, the forming equipment further includes a cutting mechanism, which includes a sliding seat, a sliding drive, and a cutting component. The sliding seat is slidably disposed on the machine base and is located on the side of the forming frame away from the rotary drive. The sliding drive is fixedly disposed on the machine base, and its output end is connected to the sliding seat. The cutting component is fixedly disposed on the sliding seat. A collection basket is provided below the machine base, and the cutting component can cut the produced corrugated cooling pipes.

[0031] By adopting the above technical solution, the cutting mechanism is set at the tail end of the machine platform away from the guide frame and close to the outlet of the corrugated cooling pipe. After the corrugated pipe is formed, it can move the sliding seat in conjunction with the sliding drive component, so that the cutting part can move flexibly in different positions and perform cutting operations. This structure can realize automated cutting, avoiding problems such as corrugated pipe deformation, burrs or pipe wall flattening caused by traditional manual cutting, while improving product neatness and dimensional consistency. In addition, the cutting mechanism is linked with the collection basket, so that the cut pipe scraps can automatically fall into the collection basket, which not only improves production efficiency, but also optimizes the material collection process, which facilitates subsequent plastic recycling and steel wire scrap recycling, avoids messy stacking and manual sorting, and meets the needs of continuous and automated production.

[0032] Thirdly, this application also provides a molding process suitable for producing automotive plastic corrugated cooling pipes, comprising the following steps:

[0033] S1, the mixed plastic granules are put into the first extruder and heated to melt. The strip-shaped preform is extruded through the die. The molding equipment is started to pull and shape the extruded preform into a hollow thin-walled inner tube.

[0034] S2, the technicians fix the end of the steel wire to the forming equipment, and the forming equipment spirally winds the steel wire around the inner tube with equal pitch.

[0035] S3, the mixed plastic granules are fed into the second extruder and heated to melt. The second extruder extrudes a strip-shaped preform through the die. The molding equipment is started to pull the strip-shaped preform extruded by the second extruder to cover the inner tube wrapped with steel wire.

[0036] S4. As the forming equipment continues to rotate, the strip-shaped blank completely covers the steel wire and merges with the inner tube. The corrugated cooling tube that has been formed will continue to extend to one side as it rotates. The forming equipment will first adjust the wall thickness at the valley part of the corrugated cooling tube.

[0037] S5. Subsequently, the molding equipment performs wall thickness detection on the preliminarily formed plastic corrugated cooling pipe. When it is detected that the wall thickness is thinner at the valley position of the corrugated cooling pipe, the molding equipment will make targeted repair and adjustment to make the wall thickness of the corrugated cooling pipe uniform.

[0038] By adopting the above technical solution, using a combination of multi-stage extrusion and winding, and supplemented by an overlap and wall thickness control mechanism, a stable coverage of the steel wire skeleton by the plastic preform is achieved, ensuring the uniformity of the corrugated pipe forming. 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 pipe from the source.

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

[0040] 1. The traction mechanism provides stable wire traction force and guiding accuracy during the winding process. The limiting holes securely position the end of the wire, while the slide block reciprocates under the action of the lead screw, thus enabling automatic wire traction and winding, reducing labor costs and minimizing the impact of human error on product performance. Furthermore, the multiple sets of guide rods on the guide frame effectively prevent slippage or deviation during the initial winding of the wire, thereby improving the consistency of the wire spiral winding angle and pitch. This also enhances the tightness and corrugation stability of the entire reinforcing layer during the molding process, effectively reducing misalignment between the inner tube outer wall and the wire, laying a uniform foundation for subsequent outer plastic coating.

[0041] 2. Through the mechanical interlocking structure set between the limit block and the slide, reliable fixing and rapid release of the end of the steel wire are achieved. Under the elastic force of the clamping spring, the locking pin can be stably inserted into the locking hole of the insertion part, effectively preventing the steel wire from loosening or dislodging 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 enables the unlocking action to be automatically triggered when the slide moves to the predetermined position, and the steel wire end release operation can be completed without manual intervention. This significantly improves the automation level and continuous production efficiency of the equipment, reduces human operation error, and helps to improve the finished product consistency and structural stability of the corrugated cooling pipe.

[0042] 3. By continuously contacting the valley of the corrugated cooling pipe with the abutment wheel, the minute changes in the wall thickness of the pipe in the valley area can be sensed in real time. When the wall thickness is uneven, the contact pressure between the valley and the abutment wheel changes, which causes the deformation of the compression spring to change. The pressure sensor then detects the corresponding signal fluctuation, realizing continuous wall thickness detection of the corrugated cooling pipe. This 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 wall thickness uniformity control of the corrugated cooling pipe, and effectively avoiding the problems of low efficiency and data lag in traditional manual sampling or contact measurement methods.

[0043] 4. The adjustable mechanism allows for targeted wall thickness adjustment of the corrugated cooling pipe. By introducing a polymer material with added photoinitiator into the adjustment mechanism, targeted spraying of material can be applied to the valley areas of the corrugated cooling pipe, forming a directional repair layer in areas with insufficient wall thickness. Additionally, hot rollers can be used to spread and distribute excessive wall thickness at the center line of the overlap area to both sides, avoiding instability in pipe performance caused by uneven local thickness. This effectively solves the structural weakness caused by insufficient wall thickness in the valley areas of the corrugated pipe, improves the overall uniformity and compressive strength of the cooling pipe, and avoids fatigue damage and leakage risks during use due to differences in wall thickness. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the automotive plastic corrugated cooling pipe in the embodiments of this application.

[0045] Figure 2 This is a schematic diagram of the overall structure of the equipment for producing plastic corrugated cooling pipes in the embodiments of this application.

[0046] Figure 3 This is a schematic diagram of the molding equipment in the embodiments of this application.

[0047] Figure 4 This is a schematic diagram of the overall structure of the overlapping mechanism and the guide frame in the embodiments of this application.

[0048] Figure 5 This is a schematic diagram of the traction mechanism in the embodiments of this application.

[0049] Figure 6 This is a schematic diagram of the adjustment mechanism in the embodiments of this application.

[0050] Figure 7 yes Figure 6 An enlarged schematic diagram of part A in the middle.

[0051] Figure 8 This is a partial cross-sectional schematic diagram of the testing mechanism in the embodiments of this application.

[0052] Reference numerals: 1. Tube body; 11. Inner layer; 12. Reinforcing layer; 13. Outer layer; 2. Molding equipment; 21. Machine base; 211. Controller; 212. Bearing seat; 213. Fixed seat; 214. Mounting frame; 215. Rotating frame; 216. Collection basket; 22. Rotary drive component; 221. Drive shaft; 222. First fixed plate; 223. Second fixed plate; 224. Third fixed plate; 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 block; 2441. Insertion part; 2442. Locking hole; 2443. Relief groove; 245. Limiting block; 2451. Insertion groove; 2452. Receiving groove; 246. Limiting hole; 247. Locking element; 2471. Locking pin; 2472. Pressing spring; 2473. Pressing rod; 25. Detection mechanism; 251. Abutment 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; 27. Overlapping mechanism; 271. Drive gear; 272. Driven gear; 273. First motor; 274. Overlapping rod; 28. Cutting mechanism; 281. Sliding seat; 282. Sliding drive; 283. Cutting component; 3. First extruder; 4. Second extruder. Detailed Implementation

[0053] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0054] This application discloses a plastic corrugated cooling pipe for automobiles.

[0055] Reference Figure 1 The automotive plastic corrugated cooling pipe is configured with an asymmetrical corrugated structure formed by alternating peaks and valleys, and the pipe body 1 of the automotive plastic corrugated cooling pipe is configured with a multi-layer structure, which is configured from the inside to the outside as: inner layer 11, reinforcing layer 12 and outer layer 13, wherein the inner layer 11 is configured as a thermally conductive modified nylon pipe.

[0056] The reinforcing 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 spiral angle α and a pitch of α, where α can be any degree between 60° and 75°. The spiral winding pitch S of the steel wire and the diameter d of the steel wire satisfy the relationship S=kd, where k can be any constant between 8 and 12. The surface of the steel wire is covered with a modified polyamide hot-melt treatment layer.

[0057] A larger winding angle, meaning the tangent direction of the wire winding position is closer to the axis of the inner tube, generally provides better axial flexibility, but the radial compressive strength will decrease accordingly. On the other hand, a smaller winding angle can enhance the radial support force, but will limit the axial bending ability. According to the embodiments of this application, in practical applications, considering the bending and vibration of the vehicle during driving, the plastic corrugated cooling pipe is wound at equal intervals on the outer surface of the inner tube with a winding angle of 60°~75° to maintain the flexibility of the pipe body, while sufficient radial support can withstand the pressure of the internal cooling medium.

[0058] 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 consistent for wires of different diameters, thus maintaining structural consistency. For example, when the wire diameter is larger, the pitch also increases to avoid an overly tight structure due to a too-small pitch, which would affect flexibility, or an overly large pitch, which would result in insufficient support.

[0059] The outer layer 13 is a weather-resistant thermoplastic polyurethane layer. The outer layer 13 covers the inner layer 11, which is wrapped with the reinforcing 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. 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, which will affect the flexibility and vibration absorption capacity of the pipe. If the ratio is too large, it may lead to insufficient structural strength, making it easy to deform or break under high pressure.

[0060] Automotive cooling systems typically need to withstand the circulation of high-temperature coolant while also dealing with mechanical stresses from engine vibration and vehicle movement. The bellows needs to maintain good sealing and durability under these conditions. The constant 'b' can be any value between 0.12 and 0.20 to balance flexibility and rigidity, ensuring the pipe doesn't collapse when bent, while maintaining sufficient flow area and reducing fluid resistance.

[0061] This application also discloses a molding process for a plastic corrugated cooling pipe for automobiles, including the following steps:

[0062] S1, Inner tube forming: The mixed plastic granules are fed into the first extruder 3 and heated to melt. The strip-shaped preform is extruded through the mold. The forming equipment 2 is started to pull and shape the extruded preform into a hollow thin-walled inner tube.

[0063] S2, Reinforcing layer 12 winding, technicians fix the end of the steel wire to the forming equipment 2, and the forming equipment 2 spirally winds the steel wire with equal pitch onto the inner tube;

[0064] S3, outer tube winding: the mixed plastic granules are fed into the second extruder 4 and heated to melt. The second extruder 4 extrudes a strip-shaped preform through the die. The molding equipment 2 is started to pull the strip-shaped preform extruded by the second extruder 4 to cover the inner tube wound with steel wire.

[0065] S4, Outer tube shaping: As the forming equipment 2 rotates continuously, the strip-shaped blank completely covers the steel wire and merges with the inner tube. The already formed corrugated cooling tube will extend to one side as it rotates. The forming equipment 2 will first adjust the wall thickness at the valley position of the corrugated cooling tube.

[0066] S5, Wall thickness detection: Subsequently, the molding equipment 2 performs wall thickness detection on the preliminarily formed plastic corrugated cooling pipe. When it is detected that the wall thickness is thinner at the valley position of the corrugated cooling pipe, the molding equipment 2 will make targeted adjustments to the wall thickness to make the wall thickness of the corrugated cooling pipe uniform.

[0067] Based on the above process, this application also proposes a molding device for plastic corrugated cooling pipes, referring to... Figure 1 and Figure 3 The molding equipment 2 includes a machine base 21, a rotary drive component 22, a guide frame 23, a traction mechanism 24, an overlapping mechanism 27, a detection mechanism 25, an adjustment mechanism 26, and a cutting mechanism 28. The rotary drive component 22 is mounted on the machine base 21, the guide frame 23 is mounted on the output end of the rotary drive component 22, the traction mechanism 24 is mounted on the guide frame 23, the overlapping mechanism 27, the detection mechanism 25, the adjustment mechanism 26, and the cutting mechanism 28 are all mounted on the machine base 21. The overlapping mechanism 27 is located between the guide frame 23 and the rotary drive component 22, the detection mechanism 25 is located on the side of the guide frame 23 away from the rotary drive component 22, the adjustment mechanism 26 is mounted on one side of the detection mechanism 25, and the cutting mechanism 28 is mounted on the side of the detection mechanism 25 away from the guide frame 23.

[0068] The machine base 21 serves as the installation foundation for the entire molding equipment 2. The rotary drive component 22 drives the guide frame 23 to rotate, and the molten plastic from the two extruders is gradually wound into a tube through the guide frame 23. The traction mechanism 24 can automatically wind the steel wire spiral at equal intervals onto the guide frame 23 and automatically release the fixing limit on the steel wire at the end of the guide frame 23. The detection mechanism 25 can detect the wall thickness at the valley position of the corrugated cooling tube. The adjustment mechanism 26 can adjust the wall thickness of the corrugated cooling tube according to the real-time detection feedback of the detection mechanism 25, so that the wall thickness of the produced corrugated cooling tube is uniform. The cutting mechanism 28 can cut the formed corrugated cooling tube into the length required for actual production.

[0069] Reference Figure 4 and Figure 5In this embodiment of the application, the first extruder 3 and the second extruder 4 are respectively arranged on both sides of the machine base 21, and the first extruder 3 is located at one end of the length direction of the machine base 21, and the second extruder 4 is located at the other end of the length direction of the machine base 21. A controller 211 is installed on the machine base 21, and a support seat 212 is fixed on the machine base 21. The support seat 212 is located on the side of the machine base 21 close to the first extruder 3.

[0070] The rotary drive component 22 is configured as a servo motor and is fixed on the support plate. The rotary drive component 22 is electrically connected to the controller 211. A transmission shaft 221 is fixed on the output end of the rotary drive component 22. The transmission shaft 221 rotatably passes through the support seat 212. A bearing seat is also installed on the side of the support seat 212 away from the rotary drive component 22. The transmission shaft 221 is rotatably connected to the bearing seat. The guide frame 23 is installed on the end of the transmission shaft 221 away from the support seat 212.

[0071] The forming frame 23 includes a forming rod 232 and a forming cylinder 231. A first fixed plate 222, a second fixed plate 223, and a third fixed plate 224 are sequentially fixed along the axis of the drive shaft 221. A counterweight plate is also fixed on the drive shaft 221, located between the first fixed plate 222 and the bearing seat. The forming cylinder 231 is coaxially sleeved on the drive shaft 221, and is located between the first fixed plate 222 and the second fixed plate 223. One end of the forming cylinder 231 is fixedly connected to the first fixed plate 222, and the other end is fixedly connected to the second fixed plate 223. Multiple sets of first extrusion rollers are installed on the machine base 21, and these rollers are installed on both sides of the forming cylinder 231 and arranged alternately. The first extrusion rollers movably abut against the forming cylinder 231.

[0072] A guide rod 232 is disposed between the second fixed plate 223 and the third fixed plate 224. One end of the guide rod 232 is fixedly connected to the second fixed plate 223, and the other end is fixedly connected to the third fixed plate 224. In this embodiment, the guide rod 232 includes a fixed part and a guide part. The fixed part is a round rod, and the guide part is a double cone. The guide part is coaxially fixed on the fixed part and has a guide ring groove. Multiple sets of guide parts are provided on the fixed part, and the multiple sets of guide parts are arranged in an arrangement on the fixed part. At the same time, four sets of guide rods 232 are provided on the second fixed plate 223, and the four sets of guide rods 232 are circumferentially distributed with the transmission shaft 221 as the axis.

[0073] Reference Figure 4 and Figure 5In this embodiment, the traction mechanism 24 includes a reciprocating screw 241, a transmission gear 242, a gear ring 243, a slide block 244, a limiting block 245, and a locking member 247. A unwinding machine with a steel wire wound around it is provided on one side of the second extruder 4. The unwinding machine unwinds the steel wire outward, and the surface of the steel wire is covered with a modified polyamide hot-melt treatment layer. The reciprocating screw 241 is located between the second fixed plate 223 and the third fixed plate 224. One end of the reciprocating screw 241 is rotatably passed through the second fixed plate 223, and the other end of the reciprocating screw 241 is rotatably connected to the third fixed plate 224. An extension rod 2411 is coaxially fixed at one end of the reciprocating screw 241 near the second fixed plate 223. The extension rod 2411 is rotatably passed through the first fixed plate 222. A guide rod is also installed between the second fixed plate 223 and the third fixed plate 224. The guide rod is located below the reciprocating screw 241 and is not shown in the accompanying drawings of this embodiment.

[0074] The transmission gear 242 is fixed at the end of the extension rod 2411 away from the reciprocating lead screw 241. A fixed seat 213 is fixed on the machine base 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. The gear ring 243 is fixed on the fixed seat 213 away from the rotating drive member 22. The transmission gear 242 meshes 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.

[0075] The slide 244 is mounted on the reciprocating lead screw 241 and is threadedly connected to the reciprocating lead screw 241. The slide 244 is also slidably connected to the guide rod. The limiting block 245 is rotatably mounted on the outer wall of the slide 244 via a hinge. A torsion spring is mounted on the hinge. A first insertion groove 2451 is provided on the side of the slide 244 away from the drive shaft 221. A second insertion groove 2451 is provided on the side of the limiting block 245 away from the drive shaft 221. The first insertion groove 2451 and the second insertion groove 2451 can be combined to form a limiting hole 246 for fixing the end of the steel wire.

[0076] The locking component 247 includes a locking pin 2471, a retaining spring 2472, and a pressing rod 2473. The limiting block 245 is provided with a insertion groove 2451 and a receiving groove 2452. The insertion groove 2451 is provided on the side of the limiting block 245 that is in contact with the slide 244, and the receiving groove 2452 is provided on the side of the limiting block 245 facing the third fixing plate 224. The insertion groove 2451 and the receiving groove 2452 are arranged in a cross pattern.

[0077] The locking pin 2471 is slidably disposed in the receiving groove 2452. The clamping spring 2472 is disposed in the receiving groove 2452. One end of the clamping spring 2472 is connected to one end of the locking pin 2471, and the other end of the clamping spring 2472 is connected to the inner wall of the receiving groove 2452. The slide block 244 and the limiting block 245 are fixedly provided with a plug-in part 2441. The plug-in part 2441 is provided with a locking hole 2442 and a clearance groove 2443. The clearance groove 2443 communicates with the locking hole 2442, and the clearance groove 2443 is opened through the end of the plug-in part 2441 that is away from the slide block 244. The end of the locking pin 2471 that is away from the clamping spring 2472 is plugged into the locking hole 2442.

[0078] The pressing rod 2473 is fixed on the side of the third fixed plate 224 facing the second fixed plate 223. The pressing rod 2473 is inserted into the receiving 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 groove width of the relief groove 2443.

[0079] More specifically, when the rotary drive 22 drives the guide frame 23 to rotate, the transmission gear 242 meshes and rotates in the gear ring 243, thereby causing the transmission gear 242 to drive the reciprocating screw 241 to rotate. At the beginning of the corrugated cooling tube forming, the limiting block 245 is fastened on the slide 244, and the end of the steel wire is inserted into the limiting hole 246. As the guide frame 23 rotates, the steel wire can spirally wind around the guide frame 23. When the slide 244 moves to the third fixed plate 224, the pressing rod 2473 is inserted into the receiving groove 2452. The end of the pressing rod 2473 away from the third fixed plate 224 pushes the locking pin 2471 out of the locking hole 2442. Under the action of the torsion spring, the limiting block 245 swings away from the slide 244, and the pressing rod 2473 slides out from the relief groove 2443, thereby releasing the fixed limitation on one end of the steel wire.

[0080] Reference Figure 4 In this embodiment, the overlapping mechanism 27 includes a drive gear 271, a driven gear 272, a first motor 273, and an overlapping rod 274. A rotating frame 215 is fixed on the machine base 21 and is sleeved on the transmission shaft 221. The rotating frame 215 is located on the side of the forming cylinder 231 near the rotating drive 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 configured as a servo motor. The first motor 273 is electrically connected to the controller 211. The drive gear 271 is fixed on the output end of the first motor 273 and meshes 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 plate 224.

[0081] Reference Figure 6 , Figure 7 and Figure 8 In this embodiment, the detection mechanism 25 includes a sliding cylinder 254, a sliding rod 255, an abutment wheel 251, a compression spring 252, and a pressure sensor 253. A mounting sleeve 225 is fixed on the side of the third fixed plate 224 facing away from the second fixed plate 223. A mounting frame 214 is provided on the machine base 21. The mounting frame 214 is a gantry frame and is mounted above the mounting sleeve 225. The sliding cylinder 254 is a quadrangular prism cylinder with one open end. One end of the sliding cylinder 254 is fixed on the mounting frame 214, and the open end of the sliding cylinder 254 faces the mounting sleeve 225. One end of the sliding rod 255 is slidably disposed inside 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 abutment wheel 251 is rotatably disposed on the rotating seat and is in contact with the valley of the corrugated cooling pipe.

[0082] Both the compression spring 252 and the pressure sensor 253 are disposed inside the sliding cylinder 254. The pressure sensor 253 is fixedly embedded in the bottom wall of the sliding cylinder 254 and is electrically connected to the controller 211. One end of the compression spring 252 is connected to the pressure sensor 253, and the other end of the compression spring 252 is fixedly connected to one end of the sliding rod 255. In the initial state, the compression spring 252 is in a compressed state. If the wall thickness at the valley position is uniform, the pressure on the pressure sensor 253 should be a fixed value. If the force on the pressure sensor 253 increases, it means that the wall thickness at that position has increased; conversely, if the force on the pressure sensor 253 decreases, it means that the wall thickness at that position has decreased. In this embodiment, three sets of detection mechanisms 25 are provided. The three sets of detection mechanisms 25 are arranged in a row on the mounting frame 214, and each set of abutment wheels 251 is deflected to the side of the rotation direction of the corrugated cooling pipe.

[0083] Reference Figure 6 and Figure 7In this embodiment, the regulating mechanism 26 includes a storage tank 261, an infusion pipe 262, a curing lamp 263, a scraper 264, and a scraping drive 265. The storage tank 261 is fixed on the machine base 21. Polyurethane prepolymer is injected into the storage tank 261, and a photoinitiator and reactive diluent are mixed into the polyurethane prepolymer. A pressure pump is installed on the storage tank 261, and the pressure pump is electrically connected to the controller 211. The input end of the pressure pump is connected to the storage tank 261. The infusion pipe 264... 2 One end is connected to the output end of the pressure pump, and the other end of the infusion pipe 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 abutment wheel 251. The spray direction of the nozzle 2621 is towards the abutment wheel 251 and the corrugated cooling pipe abutment position. The curing lamp 263 is fixedly mounted on the mounting frame 214 and is located on the side of the abutment wheel 251 away from the extruder. In this embodiment, the curing lamp 263 is set as an ultraviolet lamp.

[0084] 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, which in turn causes the polyurethane prepolymer to cure rapidly and fill the thinned area of ​​the upper valley wall.

[0085] The scraper 264 is obliquely mounted on the mounting bracket 214. The scraper 264 is located on the side of the abutment wheel 251 near the guide frame 23. A connecting rod is fixedly mounted on one end of the scraper 264. The connecting rod slides through the mounting bracket 214, and the scraper 264 is tangentially positioned to the valley 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 configured as a piezoelectric transducer. The scraping drive 265 and the scraper 264 together form an ultrasonic cutting blade for use on the initially formed corrugated cooling pipe. The scraping drive 265 is electrically connected to the controller 211 and is fixedly mounted on the mounting bracket 214.

[0086] More specifically, under normal conditions, the wall thickness at the valley section of the corrugated cooling pipe is uniform. 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 on the pressure sensor 253 is also stable. However, the corrugated cooling pipe is prone to deviation of the winding trajectory due to rotational inertia and extruder discharge fluctuations, resulting in uneven wall thickness distribution in the overlap area. In this case, three situations will occur in the overlap area: First, the winding trajectory is correct, and the wall thickness distribution in the overlap area is uniform; second, the winding trajectory is shifted towards the discharge direction of the corrugated cooling pipe, in which case the wall thickness in the overlap area will be normal on both sides, but thinner at the center of the overlap area; third, the winding trajectory is shifted towards the forming direction of the corrugated cooling pipe, in which case the wall thickness in the overlap area will be thinner on both sides, but thicker at the center of the overlap area.

[0087] Meanwhile, three sets of abutment rollers 251 are used for detection, one for each side of the overlap area and the other for the middle of the overlap area. Therefore, the three sets of pressure sensors 253 are designated as the first, second, and third detection groups, respectively. 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 onto the center line of the overlap area through the nozzle. Simultaneously, the curing lamp 263 is activated to quickly cure and fill the thinned areas. A scraper 264 is used to first reshape the valley area, removing any excessive wall thickness. Further detection is then performed on the valley area to check for any thinning. By specifically repairing the thinned areas, the wall thickness of the overlap area (valley area) can be adjusted.

[0088] Reference Figure 3 In this embodiment, the cutting mechanism 28 includes a sliding base 281, a sliding drive 282, and a cutting component 283. The sliding base 281 is slidably disposed on the side of the machine base 21 away from the support base 212. The sliding drive 282 is fixed on the machine base 21 and is configured as an electric push rod. The sliding drive 282 is electrically connected to the controller 211, and the output end of the sliding drive 282 is connected to the sliding base 281. The cutting component 283 is fixed on the sliding base 281 and is configured as an electric pipe cutter. The cutter is electrically connected to the controller 211. A collection basket 216 is disposed below the machine base 21 and is located below the cutting component 283.

[0089] Meanwhile, a tracked traction machine for pulling corrugated cooling pipes out is installed on the side of the machine base 21 away from the rotating drive component 22. A certain distance is reserved between the tracked traction machine and the machine base 21. In addition to dividing the corrugated cooling pipes into finished products, the cutting machine can also cut off transitional products during production, causing them to fall into the collection basket 216. Transitional products, such as the corrugated cooling pipes produced at the beginning, can be collected in the collection basket 216 for subsequent recycling of plastic and steel wire, especially plastic scraps, thereby reducing production costs and improving production efficiency. The tracked traction machine is not shown in the accompanying drawings of this embodiment.

[0090] The implementation principle of the automotive plastic corrugated cooling pipe and its molding process in this application embodiment is as follows: First, start the first extruder 3, put the mixed plastic granules into the first extruder 3 for heating and melting, and extrude a strip-shaped preform through the die. Then, start the first motor 273 to drive the overlapping rod 274 to deflect from the first extruder 3 to the second extruder 4. The overlapping rod 274 will overlap the extruded strip-shaped preform on the forming cylinder 231. The controller 211 controls the guide frame 23 to rotate, so that the preform forms an inner tube on the forming cylinder 231.

[0091] Subsequently, the technicians inserted the end of the steel wire into the limiting hole 246. The steel wire was wound around the inner tube by the spiral of the guide frame 23. At this time, the overlapping rod 274 was deflected above the steel wire. During this period, when the slide 244 moved to the third fixed plate 224, the limiting hole 246 automatically released the limiting of the end of the steel wire. The mixed plastic granules were put into the second extruder 4 for heating and melting. The second extruder 4 extruded a strip-shaped preform through the die. Then, the controller 211 started the first motor 273 to continue to deflect. The overlapping rod 274 covered the inner tube with the steel wire wrapped with the extruded strip-shaped preform. As the guide frame 23 continued to rotate, the extrusion rollers made the strip-shaped preform completely cover the steel wire and fuse with the inner tube, so as to initially fix the shape of the outer ring of the plastic corrugated cooling tube.

[0092] The corrugated cooling tube with preliminary forming is moved to the end of the forming frame 23. The scraper 264 first scrapes and shapes the outer wall of the corrugated cooling tube. Then, the abutment wheel 251 and the mounting sleeve 225 are used to detect the wall thickness of the preliminarily formed plastic corrugated cooling tube. When the detection mechanism 25 detects that the wall thickness of the corrugated cooling tube is uneven, the adjustment mechanism 26 set on the forming equipment 2 will make targeted adjustment of the wall thickness to make the wall thickness of the corrugated cooling tube uniform.

[0093] 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 molding equipment for automotive plastic corrugated cooling pipes, characterized in that, The device includes a machine base, a rotary drive, and a guide frame. The machine base is located on one side of the discharge port of the first extruder. A controller is installed on the machine base, and a support is fixed on the machine base. The rotary drive is fixed on the support and electrically connected to the controller. A drive shaft is fixed on the output end of the rotary drive, and the guide frame is fixedly sleeved on the drive shaft. The forming frame includes a forming rod and a forming cylinder. A first fixed plate, a second fixed plate, and a third fixed plate are sequentially fixed on the drive shaft at intervals. The forming cylinder is sleeved on the drive shaft and is located between the first fixed plate and the second fixed plate. One end of the forming cylinder is fixedly connected to the first fixed plate, and the other end of the forming cylinder is fixedly connected to the second fixed plate. The forming rod is disposed between the second fixed plate and the third fixed plate. One end of the forming rod is connected to the second fixed plate, and the other end of the forming rod is connected to the third fixed plate. Multiple sets of the forming rod are arranged on the drive shaft, and the multiple sets of the forming rod are circumferentially distributed with the drive shaft as the axis. The forming equipment further includes a traction mechanism, which comprises a reciprocating screw, a transmission gear, a gear ring, a slide block, and a limiting block. The reciprocating screw is disposed between the second fixed plate and the third fixed plate. One end of the reciprocating screw rotatably passes through the second fixed plate, and the other end of the reciprocating screw is rotatably connected to the third fixed plate. An extension rod is fixedly disposed at the end of the reciprocating screw near the second fixed plate, and the extension rod rotatably passes through the first fixed plate. The transmission gear is fixedly disposed at the end of the extension rod away from the reciprocating screw. A fixed seat is fixedly disposed on the machine base, located on the side of the first fixed plate away from the forming cylinder. The gear ring is fixedly disposed on the fixed seat, and the transmission gear meshes with the gear ring. The slide block is disposed on the reciprocating screw and is threadedly connected to the reciprocating screw. The limiting block is rotatably disposed on the slide block, and a first insertion groove is provided on the slide block. A second insertion groove is provided on the limiting block. The first insertion groove and the second insertion groove can be combined to form a limiting hole for fixing the end of the steel wire. The slide block is also equipped with a locking element, which includes a locking pin, a retaining spring, and a pressing rod. The limiting block has a insertion slot and a receiving slot respectively, which are arranged intersectingly. The slide block has a fixed insertion part, which has a locking hole and a clearance slot respectively. The clearance slot communicates with the locking hole and extends through to one end of the insertion part away from the slide block. The locking pin and the retaining spring are both slidably disposed within the receiving slot. One end of the retaining spring is connected to one end of the locking pin, and the other end of the retaining spring is connected to the receiving slot. The inner wall is connected, and the end of the locking pin away from the clamping spring is inserted into the locking hole. The diameter of the locking pin is larger than the width of the relief groove. The pressing rod is fixed on the side of the third fixed plate near the second fixed plate. The diameter of the pressing rod is smaller than the width of the relief groove. The pressing rod is inserted 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. One end of the pressing rod pushes one end of the locking pin out of the locking hole, thereby causing the limiting block to swing to one side, thereby releasing the fixed limitation on one end of the steel wire. The above-mentioned molding equipment is used to produce a corrugated plastic cooling pipe for automobiles, the corrugated cooling pipe comprising: The tube body has an asymmetric corrugated structure formed by alternating peaks and valleys; The tube body is configured from the inside out as follows: an inner layer, wherein the inner layer is a heat-conducting nylon tube; The reinforcing layer is configured as a single high-carbon steel wire continuously spirally wound structure; The outer layer is a weather-resistant thermoplastic polyurethane layer, which covers the inner layer with a reinforcing layer to form a corrugated cooling pipe. The ratio of the corrugation depth H to the inner diameter D of the pipe is b, where the corrugation depth refers to the height from the peak to the valley of the corrugation.

2. The molding equipment for automotive plastic corrugated cooling pipes according to claim 1, characterized in that: The steel wires in the reinforcing layer of the corrugated cooling pipe are wound around the outer surface of the inner layer with a constant pitch at a winding angle α. The pitch S of the spiral winding of the steel wires and the diameter d of the steel wires satisfy the relationship S=kd, where k is set as a constant. The surface of the steel wires is covered with a modified polyamide hot-melt treatment layer.

3. The molding equipment for automotive plastic corrugated cooling pipes according to claim 1, 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 fixed to the side of the third fixed plate facing away from the second fixed plate. A mounting frame is provided on the machine base, and a sliding cylinder is fixed to the mounting frame. A sliding rod is slidably disposed inside the sliding cylinder. The compression spring and the pressure sensor are both disposed inside the sliding cylinder. The pressure sensor is fixedly embedded in the inner wall of the sliding cylinder and 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 to the end of the sliding rod away from the compression spring. The abutment wheel is rotatably disposed on the rotating seat. The abutment wheel movably abuts against the valley portion of the corrugated cooling pipe. When the wall thickness at the valley portion is uneven, the pressure sensor will experience significant fluctuations due to the force exerted by the compression spring.

4. The molding equipment for automotive plastic corrugated cooling pipes according to claim 3, characterized in that: The molding equipment also includes an adjustment mechanism, which comprises a storage tank, an infusion pipe, and a curing lamp. The storage tank is fixed on the machine base and contains a polymer material with an added photoinitiator. One end of the infusion pipe is equipped with a nozzle, and the other end of the infusion pipe is connected to the storage tank. The nozzle is fixedly mounted on the mounting frame and is located on one side of the abutment wheel. The nozzle sprays towards the abutment wheel and the corrugated cooling pipe abutment position. The curing lamp is fixed on the mounting frame and is located on the side of the abutment wheel away from the guide frame. When the force on the pressure sensor decreases, the nozzle sprays polymer material into the corresponding valley position to fill it.

5. The molding equipment for automotive plastic corrugated cooling pipes according to claim 4, characterized in that: The adjustment mechanism also includes a scraper and a scraping drive. The scraper is obliquely mounted on the mounting frame and is located on the side of the abutment wheel near the guide frame. A connecting rod is fixedly mounted on one end of the scraper, and the connecting rod slides through the mounting frame. The scraper is tangentially positioned to the valley of the corrugated cooling pipe. The scraping drive is electrically connected to the controller and is fixedly mounted on the mounting frame. The scraper is fixedly connected to the output end of the scraping drive via the connecting rod.

6. The molding equipment for automotive plastic corrugated cooling pipes according to claim 4, characterized in that: The molding equipment further includes an overlapping mechanism, which includes a driving gear, a driven gear, a first motor, and an overlapping rod. A rotating frame is fixed on the machine base and is sleeved on the transmission shaft. The rotating frame is located on the side of the molding cylinder near the rotary drive component. The driven gear is sleeved on the transmission shaft. The first motor is fixed on the mounting frame and is electrically connected to the controller. The driving gear is fixed on the output end of the first motor and meshes with the driven gear. The overlapping rod is fixed on the driven gear and is arranged parallel to the transmission shaft. The end of the overlapping rod away from the driven gear is close to the third fixed plate.

7. The molding equipment for automotive plastic corrugated cooling pipes according to claim 1, characterized in that: The forming equipment also includes a cutting mechanism, which includes a sliding seat, a sliding drive, and a cutting component. The sliding seat is slidably mounted on the machine base and is located on the side of the forming frame away from the rotary drive. The sliding drive is fixed on the machine base and its output end is connected to the sliding seat. The cutting component is fixed on the sliding seat. A collection basket is provided below the machine base. The cutting component can cut the produced corrugated cooling pipes.

8. A molding process for automotive plastic corrugated cooling pipes, applicable to the molding equipment for automotive plastic corrugated cooling pipes according to any one of claims 1-7, characterized in that: Includes the following steps: S1, start the first extruder to melt and extrude plastic granules into strip-shaped preforms, start the first motor to drive the overlapping rod to deflect and overlap the preforms onto the forming cylinder; at the same time, the rotating drive component drives the guide frame to rotate, so that the preforms spirally wind to form an inner tube; S2, insert the end of the steel wire into the limiting hole of the traction mechanism, the guide frame continues to rotate, and the traction mechanism drives the slide to move through the reciprocating screw, so that the steel wire spirals and winds evenly on the surface of the inner tube; when the slide moves to the third fixed plate, the pressing rod triggers the locking device to release the end of the steel wire. S3, start the second extruder to melt and extrude plastic granules into strip-shaped preforms. The overlapping rod continues to deflect, covering the newly extruded preforms over the steel wire layer. With the help of multiple sets of first extrusion rollers, the preforms completely wrap the steel wires and fuse with the inner tube to form a preliminary corrugated cooling tube. S4. If the overlap area on the initially formed plastic corrugated cooling pipe has a thickened centerline wall, the scraper driven by the scraper will perform ultrasonic cutting and shaping of the excessively thick area. S5, the contact wheels of the three sets of detection mechanisms contact the valley of the corrugated pipe in real time to detect whether the wall thickness is uniform after the initial wall thickness modification. The pressure sensor monitors the wall thickness data and feeds it back to the controller. If the wall thickness is thinned in the center line area of ​​the overlap area, the pressure pump is started to spray the polyurethane prepolymer in the storage tank through the nozzle to the thinned area. The curing lamp irradiates and causes rapid curing. S6, the cutting mechanism starts, the sliding drive pushes the sliding seat and the cutting component, and the cutting component divides the corrugated pipe into a set length.

Images