Extrusion molding device for high-density polyethylene hose

Abstract

The invention belongs to the technical field of forming devices, and particularly relates to a high-density polyethylene hose extrusion forming device which comprises a cooling tank, cooling liquid is arranged in the cooling tank, an extrusion mechanism is arranged in the cooling tank, and molten polyethylene is extruded and output into the cooling tank through the extrusion mechanism for cooling forming; a driving part is arranged at the upper part of the cooling tank, a traction mechanism, a turbulent flow part and a shaping mechanism are arranged in the cooling tank, and the traction mechanism, the turbulent flow part and the shaping mechanism can be in power connection through the driving part, so that linkage operation of the traction mechanism, the turbulent flow part and the shaping mechanism is realized; the polyethylene hose extruded by the extrusion mechanism is conveyed into the turbulent flow part through the traction mechanism, and flowing of cooling liquid near the polyethylene hose is promoted. Multi-procedure cooperative operation is achieved through the synchronous transmission system, the heat exchange uniformity is enhanced through a turbulent flow cooling mechanism, the size precision and the surface quality are improved, and the forming stability and continuity are guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of molding equipment technology, and specifically relates to a high-density polyethylene hose extrusion molding device. Background Technology

[0002] High-density polyethylene (HDPE) hoses are widely used in municipal engineering, agricultural irrigation, food and pharmaceutical fields due to their corrosion resistance, high flexibility, and cost advantages. Their extrusion molding process requires the coordinated execution of key steps such as molten raw material extrusion, cooling and shaping, and dimensional control. However, existing technologies suffer from the following core problems: I. Insufficient synergy among multi-process drives, resulting in poor molding stability. Traditional equipment employs an "independent motor + decentralized transmission" model, where processes such as conveying, cooling, and shaping are driven by individual motors, transmitting power via belts or chains. This design results in low speed matching accuracy across different stages, easily leading to tensile deformation or wrinkling during pipe traction. Belt drives are susceptible to slippage, and their transmission efficiency decreases over long-term operation, requiring frequent maintenance and component replacement, increasing production costs and impacting continuous production.

[0003] II. Insufficient heat exchange uniformity in the cooling system, resulting in prominent internal stress issues. Current cooling methods rely on static immersion or unidirectional spraying, resulting in a stable boundary layer formed by the coolant on the pipe surface. This leads to low heat exchange efficiency and the formation of localized "dead water zones." Consequently, there is a significant difference in cooling rates between the inner and outer walls of the pipe, generating substantial internal stress. Thin-walled pipes are prone to shrinkage and indentation of the inner wall due to the outer wall solidifying first. Furthermore, the lack of directional flow control design results in uneven circumferential cooling of the pipe, leading to large deviations in straightness after forming and requiring additional straightening processes, thus extending the manufacturing process.

[0004] Third, the forming mechanism lacks self-adaptive capability, making it difficult to guarantee dimensional and surface quality. Existing forming equipment mostly uses fixed molds or rigid roller assemblies, which cannot adapt to the minute dimensional fluctuations during the tube cooling process. When the viscosity of the raw material or the traction speed changes, it can easily lead to out-of-tolerance outer diameter or surface scratches. Stress concentration from rigid molds may cause thin-walled tubes to rupture, and roller assembly designs without elastic buffers are prone to edge collisions due to eccentricity when the tube enters the forming zone, resulting in surface defects. The unreasonable edge design of traditional forming rollers easily generates sliding friction during high-speed traction, leading to a decrease in surface finish and making it difficult to meet the requirements of precision applications.

[0005] IV. The overall structure has a low degree of modularity, which limits maintenance and replacement efficiency. The existing equipment's functional modules are mostly integrated welded structures, lacking a unified installation standard. This results in poor positioning accuracy during component replacement and lengthy changeover times for multi-specification production. The separate design of the pushing system and cooling tank means that the molten tube must pass through an air section to enter the coolant after extrusion. Under high temperatures, this makes it prone to deformation due to gravity, affecting the stability of the initial shape and further restricting product quality consistency. Summary of the Invention

[0006] The purpose of this invention is to provide a high-density polyethylene hose extrusion molding device that can achieve multi-process coordinated operation through a synchronous transmission system, enhance heat exchange uniformity through a turbulent cooling mechanism, improve dimensional accuracy and surface quality through an adaptive shaping system, and ensure molding stability and continuity.

[0007] The specific technical solution adopted by this invention is as follows: A high-density polyethylene hose extrusion molding apparatus includes a cooling tank, the interior of which is filled with coolant, and an extrusion mechanism is installed inside the cooling tank. The extrusion mechanism extrudes molten polyethylene into the interior of the cooling tank for cooling and molding. The upper part of the cooling tank is provided with a drive unit, and the interior of the cooling tank is provided with a traction mechanism, a turbulence-disrupting part and a shaping mechanism. The traction mechanism, the turbulence-disrupting part and the shaping mechanism can be powered by the drive unit, thereby realizing the linkage operation of the traction mechanism, the turbulence-disrupting part and the shaping mechanism. The traction mechanism delivers the polyethylene hose extruded from the extrusion mechanism to the interior of the turbulence section, which promotes the flow of coolant near the polyethylene hose, thereby accelerating the cooling and molding of the polyethylene hose. The hose then enters the shaping mechanism, where the outer edge of the polyethylene hose is trimmed and shaped. The traction mechanism transports the shaped hose out of the shaping mechanism; The extrusion mechanism includes a storage chamber, which is fixedly connected to one end of a cooling tank. A flow guide seat is fixedly installed at the lower end of the storage chamber. A push motor is fixedly installed at one end of the flow guide seat. A push screw is fixedly connected to the output end of the push motor. A die is threadedly connected to the other end of the flow guide seat. A core mold is also threadedly connected to the other end of the flow guide seat. The gap between the die and the core mold serves as the output nozzle of the polyethylene hose.

[0008] In a preferred embodiment, the drive unit includes a mounting plate, a drive motor, a drive gear, an assembly plate, and a follower gear. The mounting plate is fixedly connected to the upper part of the cooling tank by bolts. The drive motor is fixedly connected to the upper part of the mounting plate. The drive gear is fixedly connected to the output end of the drive motor. The assembly plate can also be fixedly connected to the upper part of the cooling tank by bolts. The follower gear is rotatably connected to the corresponding assembly plate.

[0009] In a preferred embodiment, the axial length of the core mold extends through the interior of the traction mechanism, the turbulence section, and the shaping mechanism, and a cooling channel is provided inside the core mold, which is connected to the inner diameter of the tubular blank.

[0010] In a preferred embodiment, the cooling tank has multiple mounting slots with the same spacing inside, and the mounting slots are matched with the mounting positions of the traction mechanism, the turbulence section and the shaping mechanism.

[0011] In a preferred embodiment, the traction mechanism includes a conveyor frame, a conveyor wheel, a connecting gear, a conveyor roller, and a driven roller. The conveyor frame is mounted in a mounting slot inside the cooling tank. The conveyor wheel is rotatably disposed inside the conveyor frame and meshes with a corresponding driven gear. One end of the connecting gear meshes with the conveyor wheel. The conveyor roller is rotatably connected to the interior of the conveyor frame, and one end of the conveyor roller meshes with the other end of the connecting gear. The driven roller is also rotatably disposed inside the conveyor frame and is perpendicular to the conveyor roller.

[0012] In a preferred embodiment, the spoiler includes a spoiler frame, a rotating cylinder, and multiple spoilers arranged in a ring inside the rotating cylinder.

[0013] In a preferred embodiment, the interior of the turbulence tube is provided with a liquid storage tank.

[0014] In a preferred embodiment, the shaping mechanism includes a shaping frame, a rotating seat, a sliding seat, a shaping roller, and a spring. The shaping frame is assembled in a mounting slot inside the cooling tank. The rotating seat is rotatably disposed inside the shaping frame and meshes with a corresponding follower gear. Multiple sliding seats are rotatably disposed in a ring inside the rotating seat. The shaping roller is rotatably disposed inside the sliding seat. The spring is disposed between the sliding seat and the rotating seat.

[0015] In a preferred embodiment, the middle part of the shaping roller is cylindrical, and both ends of the shaping roller are provided with inclined surfaces.

[0016] In a preferred embodiment, both ends of the rotating seat, the conveying wheel, and the rotating cylinder are fixedly provided with toothed rings of the same specification, and each toothed ring can mesh with the corresponding follower gear.

[0017] The technical effects achieved by this invention are as follows: This invention employs a rigid synchronous transmission mechanism by meshing uniformly sized gear rings with follower gears at both ends of the rotating base, conveying wheel, and rotating cylinder. This ensures strict matching of the rotational speed and phase during the conveying, cooling, and shaping processes. The drive motor of the drive unit is linked with the follower gear through the drive gear, forming a mechanically rigid power transmission chain that eliminates the speed difference caused by traditional independent drives and prevents the pipe from stretching or accumulating wrinkles during conveying. Simultaneously, the rigid meshing transmission reduces power loss, lowers the risk of slippage, extends maintenance cycles, and improves the overall stability and production continuity of the system. This invention employs a design with an internal annular turbulence-inducing cylinder within the rotating cylinder. When the rotating cylinder is driven by a follower gear, the turbulence-inducing cylinder synchronously agitates the coolant, creating localized vortices that break down the boundary layer on the pipe surface and accelerate heat exchange. The coolant is stored in a reservoir within the turbulence-inducing cylinder, and during rotation, it forms a directional jet that impacts the outer circumference of the pipe. Combined with the "internal cooling" design of the internal drainage pipes within the mandrel, this achieves simultaneous cooling of the inner and outer walls. This mechanism avoids uneven cooling caused by localized "dead water areas," reduces internal stress in the pipe, solves the problem of indentation caused by the outer wall solidifying first in thin-walled pipes, and ensures the structural stability of the pipe after molding. This invention employs a ring-shaped sliding seat, elastic spring pressure, and a special structure for the shaping roller to achieve adaptive finishing. As the sliding seat revolves with the rotating seat, the spring pushes the shaping roller to adhere tightly to the outer wall of the tube. The central cylindrical roller surface trims the outer diameter, while the beveled ends form a "flared mouth" guide to prevent edge damage. This design can adapt to minute dimensional fluctuations in the tube, and combined with the "ironing" effect of the rotating shaping roller, it improves surface smoothness. Simultaneously, the spring buffer mechanism reduces the risk of rigid contact, is compatible with processing multiple tube specifications, and ensures consistency in dimensional accuracy and surface quality of the formed tube. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of an embodiment of the present invention; Figure 2 This is a side sectional view of an embodiment of the present invention; Figure 3 This is an exploded view of an embodiment of the present invention; Figure 4 This is a cross-sectional view of the cooling tank according to an embodiment of the present invention; Figure 5 This is an exploded view of the extrusion mechanism according to an embodiment of the present invention; Figure 6 This is an exploded view of the drive unit according to an embodiment of the present invention; Figure 7 This is an exploded view of the flow-disrupting section according to an embodiment of the present invention; Figure 8 This is an exploded view of the prototype mechanism of an embodiment of the present invention; Figure 9 This is a schematic diagram of a shaping roller according to an embodiment of the present invention; Figure 10 This is an exploded view of the traction mechanism according to an embodiment of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Cooling tank; 2. Extrusion mechanism; 201. Storage bin; 202. Guide seat; 203. Push motor; 204. Push screw; 205. Die; 206. Core mold; 3. Drive unit; 301. Mounting plate; 302. Drive motor; 303. Drive gear; 304. Assembly plate; 305. Follower gear; 4. Traction mechanism; 401. Conveyor frame; 402. Conveyor wheel; 403. Connecting gear; 404. Conveyor roller; 405. Driven roller; 5. Turbine unit; 501. Turbine frame; 502. Rotating cylinder; 503. Turbine cylinder; 6. Shaping mechanism; 601. Shaping frame; 602. Rotating seat; 603. Sliding seat; 604. Shaping roller; 605. Spring. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0024] Please see Figures 1 to 10 As shown, the present invention provides a high-density polyethylene hose extrusion molding device, including a cooling tank 1, a coolant inside the cooling tank 1, and an extrusion mechanism 2 inside the cooling tank 1. The molten polyethylene is extruded and output into the cooling tank 1 for cooling and molding through the extrusion mechanism 2. The upper part of the cooling tank 1 is provided with a drive unit 3, and the interior of the cooling tank 1 is provided with a traction mechanism 4, a turbulence part 5 and a shaping mechanism 6. The traction mechanism 4, the turbulence part 5 and the shaping mechanism 6 can be connected by the drive unit 3 to achieve the linkage operation of the traction mechanism 4, the turbulence part 5 and the shaping mechanism 6. The polyethylene hose extruded from the extrusion mechanism 2 is transported to the interior of the turbulence section 5 by the traction mechanism 4. The turbulence section 5 can promote the flow of coolant near the polyethylene hose, thereby accelerating the cooling and molding of the polyethylene hose. The hose then enters the shaping mechanism 6, where the outer edge of the polyethylene hose is trimmed and shaped. The traction mechanism 4 transports the shaped hose out of the interior of the shaping mechanism 6; The extrusion mechanism 2 includes a storage chamber 201, which is fixedly connected to one end of the cooling tank 1. A guide seat 202 is fixedly installed at the lower end of the storage chamber 201. A push motor 203 is fixedly installed at one end of the guide seat 202. A push screw 204 is fixedly connected to the output end of the push motor 203. A die 205 is threadedly connected to the other end of the guide seat 202. A core mold 206 is also threadedly connected to the other end of the guide seat 202. The gap between the die 205 and the core mold 206 serves as the outlet for the polyethylene hose.

[0025] Specifically, molten high-density polyethylene raw material enters the storage chamber 201 of the extrusion mechanism 2, is guided to the area of ​​the push screw 204 by the guide seat 202, and is driven to rotate by the push motor 203 to push the molten raw material along the guide seat 202 to the end. The raw material is squeezed in the annular gap between the core die 206 and the die 205 to form a hose blank with a preliminary tubular structure. The extruded hose blank directly enters the coolant in the cooling tank 1 to complete the preliminary cooling and solidification and maintain the stability of the shape. The molten high-density polyethylene raw material first enters the storage chamber 201, and is initially guided by the guide seat 202 fixed at its lower end, so that the raw material flows steadily into the pushing area.

[0026] The pusher motor 203 provides power to drive the pusher screw 204 to rotate. The pusher screw 204 pushes the molten raw material axially along the guide seat 202 through the spiral structure. By using the squeezing action between the screw and the pipe wall, the raw material is ensured to flow evenly and without stagnation, avoiding local overheating or pressure fluctuations.

[0027] After the raw material is pushed to the end of the guide seat 202, it completes the final molding through the annular gap between the core mold 206 and the die 205. The core mold 206 is fixed inside the flow guide seat 202 by a threaded connection, serving as the inner mold to define the inner diameter of the hose; The die 205 is threaded to the end of the guide seat 202 and serves as an outer mold that mates with the core mold 206. The width of the gap between the two directly determines the wall thickness of the hose. The molten raw material is squeezed into a tubular blank in the gap and directly enters the coolant in cooling tank 1 to complete the initial solidification and shaping; By coaxially arranging the storage chamber 201, the guide seat 202, and the push screw 204, the raw material flow path can be shortened, pressure loss can be reduced, and extrusion efficiency can be improved. Furthermore, the nozzle directly faces the coolant in the cooling tank 1, allowing the extruded tubular billet to immediately enter the cooling process, avoiding gravity deformation under high temperature conditions and maintaining the stability of the initial shape.

[0028] The easy disassembly of the threaded connection between the die 205 and the core die 206 facilitates cleaning and replacement of parts, reduces the risk of mold blockage caused by material residue, and extends the continuous operation time of the equipment. The drive motor 302 of the drive unit 3 drives the drive gear 303 to rotate, and through the follower gear 305 meshing with the gear ring of each component, synchronously drives the traction mechanism 4, the turbulence unit 5 and the shaping mechanism 6 to run.

[0029] In the traction mechanism 4, the follower gear 305 drives the conveyor wheel 402 to rotate, and drives the conveyor roller 404 to rotate through the connecting gear 403. The driven roller 405 clamps the hose and pulls the hose from the extrusion mechanism 2 to the shaping mechanism 6 at a constant speed, avoiding hose stretching or wrinkling caused by uneven conveying speed. After the hose enters the turbulence section 5, the rotating cylinder 502 rotates under the drive of the drive section 3, and the turbulence cylinders 503 distributed in a ring inside rotate synchronously. The liquid storage tank inside the turbulence cylinder 503 can store coolant. When rotating, it forms a local vortex, which breaks the coolant boundary layer on the surface of the hose and accelerates heat exchange.

[0030] The annular arrangement of the baffle 503 ensures that the coolant can agitate the outer periphery of the hose without dead angles, avoiding stress concentration or deformation caused by uneven local cooling, so that the hose has sufficient structural strength before entering the molding process.

[0031] After the hose enters the shaping mechanism 6, the rotating seat 602 rotates, causing the sliding seat 603 and the shaping roller 604 to rotate around the hose axis. The spring 605 provides radial pressure to the sliding seat 603, making the shaping roller 604 fit tightly against the outer edge of the hose. The outer diameter is adjusted by the central cylindrical structure, and the beveled surfaces at both ends guide the hose to transition smoothly, avoiding edge damage.

[0032] The core mold 206 axially passes through the traction mechanism 4, the turbulence part 5, and the shaping mechanism 6, serving as an "inner mold" to ensure accurate positioning of the hose axis; the elastic pressure of the external shaping roller 604 can adapt to the slight fluctuations in the hose size, ensuring the quality of the finished product's outer diameter. The shaped hose is transported by the traction mechanism 4 at the rear and continuously output from the end of the cooling tank 1, completing the entire molding process.

[0033] Please see Figures 1 to 3 as well as Figure 5As shown, the drive unit 3 includes a mounting plate 301, a drive motor 302, a drive gear 303, an assembly plate 304, and a follower gear 305. The mounting plate 301 is fixedly connected to the upper part of the cooling tank 1 by bolts. The drive motor 302 is fixedly connected to the upper part of the mounting plate 301. The drive gear 303 is fixedly connected to the output end of the drive motor 302. The assembly plate 304 can also be fixedly connected to the upper part of the cooling tank 1 by bolts. The follower gear 305 is rotatably connected to the corresponding assembly plate 304. The drive motor 302 is fixed to the mounting plate 301. The output torque is transmitted through the meshing of the drive gear 303 and the follower gear 305. The follower gear 305 then drives the rotating seat 602, the conveying wheel 402, and the rotating cylinder 502 to rotate synchronously through the gear ring, completing the conveying, cooling turbulence, and shaping of the pipe. The mounting plate 301 and the assembly plate 304 are independently fixed to the upper part of the cooling tank 1 by bolts, providing rigid support for the drive system and ensuring gear meshing accuracy and transmission stability.

[0034] Please see Figure 2 As shown, the axial length of the core mold 206 extends through the interior of the traction mechanism 4, the turbulence section 5, and the shaping mechanism 6, and a cooling channel is provided inside the core mold 206, which is connected to the inner diameter of the tubular blank.

[0035] The internal drainage pipes of the core mold 206 are connected to an external coolant source via an axially continuous structure. Their outlets are located on the outer wall of the core mold 206, allowing coolant to be directly introduced into the inner wall of the tubular blank, forming a dual cooling system with the coolant in the external cooling tank 1. This design achieves synchronous heat exchange between the inner and outer walls. When the tubular billet is pulled away from the end of the mandrel 206, due to the extremely small gap between the billet and the outer wall of the mandrel 206, the high-speed moving billet will form a dynamic negative pressure zone at the contact interface. This "negative pressure self-priming" automatically draws the coolant from the drainage pipe into the billet. This self-driven liquid-suction mechanism requires no additional pump power, reducing equipment energy consumption and failure rate. Simultaneously, it achieves "on-demand supply" of coolant—the higher the traction speed, the greater the negative pressure intensity, and the automatically increased liquid intake, avoiding problems of excessive liquid accumulation or insufficient supply. The drawn-in coolant forms a continuous and uniform liquid film on the inner wall of the billet. This not only enhances heat dissipation from the inner wall through forced convection but also forms an "internal support cold film" to maintain the cross-sectional shape. This not only improves the surface smoothness of the inner wall but also solves the problem of inward sinking caused by the pre-solidification of the outer wall in thin-walled hoses.

[0036] Please see Figures 2 to 4 As shown, the interior of the cooling tank 1 has multiple mounting slots with the same spacing. The mounting slots are matched with the mounting positions of the traction mechanism 4, the turbulence part 5 and the shaping mechanism 6, serving as a standardized installation station for installing modular functional components. Multiple identically spaced mounting slots inside the cooling tank 1, through precise matching with the mounting positions of the traction mechanism 4, the turbulence part 5, and the shaping mechanism 6, construct an integrated modular support that combines "positioning, function, and maintenance." Each component is bolted to the cooling tank 1 via the mounting slots. With the positioning design, the efficiency of replacing individual components can be improved. The system achieved the technical goals of "unified positioning benchmarks, graded functional zoning, and modularized maintenance and operation." While ensuring the straightness and dimensional accuracy of the pipes, it significantly improved the equipment's changeover efficiency and long-term operational stability, providing stable support for the continuous production of high-density polyethylene hoses.

[0037] Please see Figures 2 to 4 as well as Figure 10 As shown, the traction mechanism 4 includes a conveyor frame 401, a conveyor wheel 402, a connecting gear 403, a conveyor roller 404, and a driven roller 405. The conveyor frame 401 is mounted in the mounting slot inside the cooling tank 1. The conveyor wheel 402 is rotatably disposed inside the conveyor frame 401 and meshes with the corresponding driven gear 305. One end of the connecting gear 403 meshes with the conveyor wheel 402. The conveyor roller 404 is rotatably connected to the inside of the conveyor frame 401, and one end of the conveyor roller 404 meshes with the other end of the connecting gear 403. The driven roller 405 is also rotatably disposed inside the conveyor frame 401, and the driven roller 405 is perpendicular to the conveyor roller 404. The follower gear 305 meshes with the teeth of the conveyor wheel 402, transmitting power to the conveyor wheel 402 and causing it to rotate around its own axis. Both sides of the conveyor wheel 402 are equipped with gear structures; one side meshes with the follower gear 305, and the other side meshes with one end of the connecting gear 403. The other end of the connecting gear 403 simultaneously meshes with a gear at the end of the conveyor roller 404, forming a two-stage gear transmission: "conveyor wheel 402 → connecting gear 403 → conveyor roller 404". This process achieves a power direction conversion, driving the conveyor roller 404 to rotate actively. The rotation of the conveyor roller 404 can transport the tubular billet. Simultaneously, the driven roller 405, through its own gravity, compresses the tubular billet into close contact with the conveyor roller 404, ensuring the stability of the tubular billet transport.

[0038] Please see Figures 2 to 4 as well as Figure 7 As shown, the turbulence section 5 includes a turbulence frame 501, a rotating cylinder 502 and a turbulence cylinder 503. The turbulence frame 501 is assembled in the mounting slot inside the cooling tank 1. The rotating cylinder 502 is rotatably disposed inside the turbulence frame 501. Multiple turbulence cylinders 503 are arranged in a ring inside the rotating cylinder 502. The spoiler frame 501 is rigidly fixed through the mounting slot of the cooling tank 1, providing stable support for the entire spoiler section 5; the rotating cylinder 502 is rotatably installed in the central through hole of the spoiler frame 501 through the bearing assembly, and its power comes from the meshing follower gear 305; multiple spoiler cylinders 503 are evenly distributed in a ring along the inner wall of the rotating cylinder 502 and rotate synchronously with the rotating cylinder 502. When the coolant, such as water or a special cooling medium, fills the cooling tank 1, the rotating baffle 503 generates a tangential thrust on the coolant, breaking the natural convection state and forming a local turbulent flow field. Under the agitation of the baffle 503, the coolant flows along the outer periphery of the tubular billet without dead angles, avoiding the formation of local "dead water areas". The tubular billet pulled in by the traction mechanism 4 passes through the center of the rotating cylinder 502. The high-temperature billet comes into direct contact with the agitated low-temperature coolant. Through turbulent enhanced convection heat transfer, the heat on the surface of the billet is quickly carried away, achieving gradient cooling from the outside to the inside.

[0039] Through a mechanical structure consisting of a rotating cylinder 502 and a turbulent flow tube 503, the flow state of the coolant is transformed from laminar to turbulent, fundamentally solving the pain points of "low efficiency and poor uniformity" in traditional cooling processes. Its technological advantages are not only reflected in the dual improvement of cooling speed and uniformity, but also in the provision of stable temperature conditions for precise shaping by the downstream shaping mechanism 6 through modular design and process adaptability, ultimately ensuring the quality of the finished pipe product.

[0040] Please see Figure 7 As shown, the interior of the turbulence tube 503 is equipped with a liquid storage chamber; When the turbulence cylinder 503 rotates with the rotating cylinder 502, the coolant in the storage tank flows out from the opening of the tank body under the action of gravity, forming a directional jet that directly impacts the surface of the tubular billet to improve cooling efficiency. At the same time, the rotation of the baffle 503 can also quickly diffuse and reduce the temperature of the heated coolant around the tubular billet, further reducing the stagnant water area of ​​the hot spot.

[0041] Please see Figures 2 to 4 as well as Figure 8 and Figure 9 As shown, the shaping mechanism 6 includes a shaping frame 601, a rotating seat 602, a sliding seat 603, a shaping roller 604, and a spring 605. The shaping frame 601 is assembled in the mounting slot inside the cooling tank 1. The rotating seat 602 is rotatably disposed inside the shaping frame 601 and meshes with the corresponding follower gear 305. Multiple sliding seats 603 are rotatably disposed in a ring inside the rotating seat 602. The shaping roller 604 is rotatably disposed inside the sliding seat 603. The spring 605 is disposed between the sliding seat 603 and the rotating seat 602. The shaping frame 601 is installed and fixed through the mounting slot of the cooling tank 1, providing a reference support for the entire shaping mechanism 6. The rotating seat 602 is rotatably connected to the inside of the shaping frame 601 through the bearing assembly. The outer peripheral gear structure of the rotating seat 602 meshes with the follower gear 305, transmitting the rotational power to the rotating seat 602. Multiple sliding seats 603 are distributed in a ring along the inner wall of the rotating seat 602, and form a radial sliding fit with the rotating seat 602 through the slide rail. The spring 605 is set in the radial gap between the sliding seat 603 and the rotating seat 602, and is in a pre-compressed state, continuously applying an elastic force pointing towards the center to the sliding seat 603. When the tubular blank passes through the center of the shaping mechanism 6, the outer wall of the blank contacts the shaping roller 604, pushing the sliding seat 603 to slide radially outward against the elastic force of the spring 605 until the elastic force of the spring 605 and the reaction force of the blank on the shaping roller 604 are balanced. With the rolling rotation of the shaping roller 604, the tiny wrinkles caused by the cooling and shrinkage of the outer wall of the tube can be eliminated, and the surface smoothness can be improved. At the same time, the clamping force of the shaping roller 604 can also correct the slight deformation of the blank during the cooling process into a standard circle.

[0042] Please see Figure 9 As shown, the middle part of the shaping roller 604 is cylindrical, and both ends of the shaping roller 604 are provided with inclined surfaces; The chrome-plated cylindrical mirror rollers create an "ironing" effect on the tube surface during rolling, eliminating minor wrinkles remaining from the cooling stage, improving surface smoothness, and meeting the surface requirements of food-grade or precision tubes. The inclined structure of multiple shaping rollers 604 forms a "trumpet mouth" type inlet. When the tube enters the shaping mechanism 6 from the cooling tank 1, even if there is a slight bend or eccentricity, the inclined surface can automatically center the tube through sliding guidance to avoid rigid collision with the edge of the roller body. It is especially suitable for high-speed traction of thin-walled tubes. If a right-angle edge design is used, the pipe is prone to stress concentration due to instantaneous impact when it enters, resulting in surface scratches or micro-cracks. The beveled transition can disperse the stress to a larger contact area. Combined with the rotation of the shaping roller 604, it achieves "rolling contact" rather than sliding friction. The rotational speed of the shaping roller 604 is matched with the forward speed of the pipe, ensuring that the linear velocity of the contact point between the shaping roller 604 and the pipe is always equal to the traction speed. This avoids surface scratches or sticking of molten polyethylene to the roller due to sliding friction. At the same time, the precise speed matching makes the radial pressure applied by the shaping roller 604 to the pipe wall more uniform and stable, further improving its correction effect on slight roundness deviations such as ellipticity of the pipe, and ensuring the roundness of the pipe during continuous high-speed production.

[0043] Please see Figure 2As shown, the rotating seat 602, the conveying wheel 402 and the rotating cylinder 502 are all fixedly provided with toothed rings of the same specification at both ends, and the toothed rings can mesh with the corresponding follower gears 305. The rotating seat 602, the conveying wheel 402, and the two ends of the rotating cylinder 502 are connected to the follower gear 305 by fixed toothed rings of the same specification, forming a synchronous transmission system with mechanical hard connection. This achieves strict synchronization of the rotation speed and phase of the entire system, ensuring that the forward speed, turbulence speed, and revolution shaping speed of the pipe are precisely matched in the conveying, cooling, and shaping processes. This eliminates material deformation and surface ripples caused by speed differences. At the same time, the rigid gear meshing ensures seamless connection of the time windows of multiple processes, improving the overall processing efficiency.

[0044] The working principle of this invention is as follows: molten high-density polyethylene raw material enters the storage chamber 201 of the extrusion mechanism 2, is guided to the area of ​​the push screw 204 by the guide seat 202, and is driven to rotate by the push motor 203, pushing the molten raw material along the guide seat 202 to the end. The raw material is squeezed in the annular gap between the core mold 206 and the die 205 to form a hose blank with a preliminary tubular structure. The extruded hose blank directly enters the coolant in the cooling tank 1 to complete the preliminary cooling and solidification and maintain the stability of the shape. The drive motor 302 of the drive unit 3 drives the drive gear 303 to rotate, and through the follower gear 305 meshing with the gear ring of each component, synchronously drives the traction mechanism 4, the turbulence unit 5 and the shaping mechanism 6 to run.

[0045] In the traction mechanism 4, the follower gear 305 drives the conveyor wheel 402 to rotate, and drives the conveyor roller 404 to rotate through the connecting gear 403. The driven roller 405 clamps the hose and pulls the hose from the extrusion mechanism 2 to the shaping mechanism 6 at a constant speed, avoiding hose stretching or wrinkling caused by uneven conveying speed. After the hose enters the turbulence section 5, the rotating cylinder 502 rotates under the drive of the drive section 3, and the turbulence cylinders 503 distributed in a ring inside rotate synchronously. The liquid storage tank inside the turbulence cylinder 503 can store coolant. When rotating, it forms a local vortex, which breaks the coolant boundary layer on the surface of the hose and accelerates heat exchange.

[0046] The annular arrangement of the baffle 503 ensures that the coolant can agitate the outer periphery of the hose without dead angles, avoiding stress concentration or deformation caused by uneven local cooling, so that the hose has sufficient structural strength before entering the molding process.

[0047] After the hose enters the shaping mechanism 6, the rotating seat 602 rotates, causing the sliding seat 603 and the shaping roller 604 to rotate around the hose axis. The spring 605 provides radial pressure to the sliding seat 603, making the shaping roller 604 fit tightly against the outer edge of the hose. The outer diameter is adjusted by the central cylindrical structure, and the beveled surfaces at both ends guide the hose to transition smoothly, avoiding edge damage.

[0048] The core mold 206 axially passes through the traction mechanism 4, the turbulence part 5, and the shaping mechanism 6, serving as an "inner mold" to ensure accurate positioning of the hose axis; the elastic pressure of the external shaping roller 604 can adapt to the slight fluctuations in the hose size, ensuring the quality of the finished product's outer diameter. The shaped hose is transported by the traction mechanism 4 at the rear and continuously output from the end of the cooling tank 1, completing the entire molding process.

[0049] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A high-density polyethylene hose extrusion molding apparatus, characterized in that: It includes a cooling tank (1), the interior of which is filled with coolant, and the interior of which is filled with an extrusion mechanism (2). The molten polyethylene is extruded and output into the interior of the cooling tank (1) through the extrusion mechanism (2) for cooling and molding. The upper part of the cooling tank (1) is provided with a drive unit (3), and the interior of the cooling tank (1) is provided with a traction mechanism (4), a turbulence part (5) and a shaping mechanism (6). The traction mechanism (4), the turbulence part (5) and the shaping mechanism (6) can be connected by the drive unit (3) to achieve the linkage operation of the traction mechanism (4), the turbulence part (5) and the shaping mechanism (6). The polyethylene hose extruded from the extrusion mechanism (2) is transported to the interior of the turbulence section (5) by the traction mechanism (4). The turbulence section (5) can promote the flow of coolant near the polyethylene hose, thereby accelerating the cooling and molding of the polyethylene hose. The hose then enters the shaping mechanism (6) to trim and shape the outer edge of the polyethylene hose; The traction mechanism (4) transports the shaped hose out of the interior of the shaping mechanism (6); The extrusion mechanism (2) includes a storage chamber (201), which is fixedly connected to one end of the cooling tank (1). A guide seat (202) is fixedly provided at the lower end of the storage chamber (201). A push motor (203) is fixedly provided at one end of the guide seat (202). A push screw (204) is fixedly connected to the output end of the push motor (203). A die (205) is threadedly connected to the other end of the guide seat (202). A core mold (206) is also threadedly connected to the other end of the guide seat (202). The gap between the die (205) and the core mold (206) serves as the outlet for the polyethylene hose.

2. The high-density polyethylene hose extrusion molding apparatus according to claim 1, characterized in that: The drive unit (3) includes a mounting plate (301), a drive motor (302), a drive gear (303), an assembly plate (304), and a follower gear (305). The mounting plate (301) is fixedly connected to the upper part of the cooling tank (1) by bolts. The upper part of the mounting plate (301) is fixedly connected to the drive motor (302). The drive gear (303) is fixedly connected to the output end of the drive motor (302). The assembly plate (304) can also be fixedly connected to the upper part of the cooling tank (1) by bolts. The follower gear (305) is rotatably connected to the corresponding assembly plate (304).

3. The high-density polyethylene hose extrusion molding apparatus according to claim 2, characterized in that: The axial length of the core mold (206) extends through the interior of the traction mechanism (4), the turbulence part (5), and the shaping mechanism (6), and a cooling channel is provided inside the core mold (206), which is connected to the inner diameter of the tubular blank.

4. The high-density polyethylene hose extrusion molding apparatus according to claim 1, characterized in that: The cooling tank (1) has multiple mounting slots with the same spacing inside, and the mounting slots are matched with the mounting positions of the traction mechanism (4), the turbulence part (5) and the shaping mechanism (6).

5. The high-density polyethylene hose extrusion molding apparatus according to claim 2, characterized in that: The traction mechanism (4) includes a conveyor frame (401), a conveyor wheel (402), a connecting gear (403), a conveyor roller (404), and a driven roller (405). The conveyor frame (401) is mounted in the mounting slot inside the cooling tank (1). The conveyor wheel (402) is rotatably disposed inside the conveyor frame (401). The conveyor wheel (402) meshes with the corresponding driven gear (305). One end of the connecting gear (403) meshes with the conveyor wheel (402). The conveyor roller (404) is rotatably connected to the inside of the conveyor frame (401), and one end of the conveyor roller (404) meshes with the other end of the connecting gear (403). The driven roller (405) is also rotatably disposed inside the conveyor frame (401), and the driven roller (405) is perpendicularly corresponding to the conveyor roller (404).

6. The high-density polyethylene hose extrusion molding apparatus according to claim 2, characterized in that: The turbulence section (5) includes a turbulence frame (501), a rotating cylinder (502) and a turbulence cylinder (503). The turbulence frame (501) is mounted in the mounting slot inside the cooling tank (1). The rotating cylinder (502) is rotatably disposed inside the turbulence frame (501). Multiple turbulence cylinders (503) are arranged in a ring inside the rotating cylinder (502).

7. The high-density polyethylene hose extrusion molding apparatus according to claim 6, characterized in that: The inside of the turbulence tube (503) is equipped with a liquid storage tank.

8. The high-density polyethylene hose extrusion molding apparatus according to claim 2, characterized in that: The shaping mechanism (6) includes a shaping frame (601), a rotating seat (602), a sliding seat (603), a shaping roller (604), and a spring (605). The shaping frame (601) is mounted in the mounting slot inside the cooling tank (1). The rotating seat (602) is rotatably disposed inside the shaping frame (601) and meshes with a corresponding follower gear (305). Multiple sliding seats (603) are arranged in a ring inside the rotating seat (602). The shaping roller (604) is rotatably disposed inside the sliding seat (603). The spring (605) is disposed between the sliding seat (603) and the rotating seat (602).

9. The high-density polyethylene hose extrusion molding apparatus according to claim 8, characterized in that: The middle part of the shaping roller (604) is cylindrical, and both ends of the shaping roller (604) are provided with inclined surfaces.

10. A high-density polyethylene hose extrusion molding apparatus according to claim 8, characterized in that: The rotating seat (602), the conveying wheel (402) and the rotating cylinder (502) are all fixedly provided with toothed rings of the same specification at both ends, and the toothed rings can mesh with the corresponding follower gears (305).

Images