High-density HDPE pipe forming device and method

Abstract

The invention relates to the technical field of HDPE pipe forming, in particular to a high-density HDPE pipe forming device and method. The high-density HDPE pipe forming device comprises a base, an injection molding module, a forming module, an electric push rod, a motor and a screw rod, the forming module is fixedly connected to the left side of the top of the base, the injection molding module is slidably connected to the right side of the top of the base through a sliding rail, and the motor is installed on the right side of the injection molding module through a support. A screw rod is connected to an output shaft of the motor and rotationally arranged in the injection molding module. Synchronous cooling of the inner wall and the outer wall of the HDPE pipe is achieved through a double cooling system composed of the outer cooling pipe and the inner cooling pipe-spray pipe. The outer cooling pipe circulates cooling liquid to cool the periphery of the pipe, the inner cooling pipe evenly sprays the cooling liquid to the inner wall through the spraying pipe, the problems of internal stress concentration, deformation and the like caused by uneven cooling of the pipe are effectively avoided, the size precision, the mechanical property and the surface quality of the pipe are remarkably improved, and the service life of the pipe is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of HDPE pipe forming, and particularly relates to a high-density HDPE pipe forming device and a method thereof. Background Art

[0002] In modern industrial production, high-density polyethylene (HDPE) pipes are widely used in fields such as municipal water supply and drainage, gas transmission, agricultural irrigation, and industrial fluid transmission due to their excellent chemical corrosion resistance, high wear resistance, good environmental stress cracking resistance, and long service life. With the continuous improvement of market requirements for the quality and performance of HDPE pipes, the cooling process during pipe forming has become a key factor affecting product quality.

[0003] At present, traditional HDPE pipe forming devices mostly adopt a single external cooling method, that is, the outer wall of the pipe is cooled by an external cooling pipe. This cooling method has obvious defects: since the heat inside the pipe is difficult to dissipate quickly, the cooling speeds of the inside and outside of the pipe are inconsistent, forming a large temperature gradient. Research shows that when the temperature difference between the inside and outside of the pipe exceeds 15 °C, significant residual stress will be generated inside the pipe, which will in turn cause quality problems such as pipe deformation and warping. At the same time, uneven cooling will also lead to uneven crystallinity distribution of the pipe, reducing the tensile strength and impact resistance of the pipe.

[0004] Therefore, it is of great practical significance to develop an HDPE pipe forming device that can achieve uniform cooling inside and outside the pipe and improve product quality. Summary of the Invention

[0005] In order to overcome the above-mentioned drawbacks, the present invention provides a high-density HDPE pipe forming device and a method thereof.

[0006] The technical implementation solution of the present invention is: a high-density HDPE pipe forming device, including a base, an injection molding module, a forming module, an electric push rod, a motor, and a screw rod. The left side of the top of the base is fixedly connected with the forming module. The right side of the top of the base is slidably connected with the injection molding module through a slide rail. The motor is installed on the right side of the injection molding module through a bracket. The output shaft of the motor is connected with the screw rod. The screw rod is rotatably arranged inside the injection molding module. The right side of the top of the base is provided with an electric push rod. The telescopic rod of the electric push rod is connected with the bottom of the injection molding module. It also includes a docking pipe, an internal cooling pipe, a conveying pipe, a spray pipe, an external cooling pipe, and a water supply component. The left end of the screw rod is rotatably connected with the docking pipe, and the two are interconnected. The right side of the forming module is connected with the internal cooling pipe through a bracket. The internal cooling pipe is located inside the forming module. The conveying pipe is connected inside the screw rod. The spray pipe is rotatably connected inside the internal cooling pipe. The right end of the screw rod is provided with a water supply component. The outside and inside of the forming module are connected in a surrounding manner with the external cooling pipe. The two ends of the external cooling pipe respectively penetrate out of the outside of the forming module.

[0007] In a preferred embodiment of the present invention, the inner wall of the conveying pipe is coated with a high-temperature resistant coating, which can effectively isolate the heat transfer of the molten liquid in the injection molding module.

[0008] In a preferred embodiment of the present invention, the nozzle is designed with multiple holes, and the outlet of the holes is designed in the shape of an outwardly expanding flared mouth.

[0009] In a preferred embodiment of the present invention, the water conveying assembly includes an annular frame, a collar, a connecting pipe, a water outlet pipe and a water inlet pipe. Two collars are connected to the outer side of the right end of the screw rod. Annular frames are respectively rotatably connected to the parts of the screw rod outside the two collars. The annular frame communicates with the collar. A through hole is provided on the left collar, and the through hole penetrates through the inside of the screw rod for communicating the inside of the left annular frame with the inside of the screw rod. The right end of the conveying pipe is connected and communicated with a connecting pipe, and the connecting pipe penetrates through the screw rod and is connected to the right collar and communicates with the right annular frame. The front side of the left annular frame is connected and communicated with a water outlet pipe, and the front side of the right annular frame is connected and communicated with a water inlet pipe.

[0010] In a preferred embodiment of the present invention, it further includes a support ring, a sealing block and a return spring. Support rings are respectively connected to the left end of the conveying pipe and the right end of the nozzle. Sealing blocks are respectively slidably connected to the support rings. The support rings are in close contact with the sealing blocks. A return spring is connected between the sealing block and the support ring. The two sealing blocks are in contact and cooperate with each other.

[0011] In a preferred embodiment of the present invention, it further includes a docking rod, a support block, a sealing frame and a compression spring. Support blocks are respectively connected to the inside of the docking pipe and the right end inside the inner cooling pipe. A sealing frame is slidably connected to the support block. A compression spring is between the sealing frame and the support block. Docking rods are respectively connected to the positions on the other side of the support blocks inside the docking pipe and the right end inside the inner cooling pipe. The sealing frame is in close contact with the docking rod. The two support blocks, docking rods and sealing frames are respectively in sealing and rotational cooperation with the corresponding conveying pipe and nozzle. The two sealing frames are in contact and cooperate with each other.

[0012] In a preferred embodiment of the present invention, it further includes a support seat, a horizontal slide rail, a vertical slide rail, a lifting block and a cutting knife. A support seat is connected to the left side of the top of the base, and the support seat is located on the left side of the molding module. Horizontal slide rails are symmetrically installed on the top of the support seat. A vertical slide rail is slidably connected to the horizontal slide rail. A lifting block is slidably connected between the two vertical slide rails. A cutting knife is installed at the bottom of the lifting block.

[0013] In a preferred embodiment of the present invention, it further includes a follower frame, an inclined plate, a support plate, a clamping plate, a tension spring and a return spring. The outer sides of both vertical sliding rails are slidably connected with inclined plates. Tension springs are connected between the inclined plates and the corresponding vertical sliding rails. A follower frame is connected between the right sides of the two inclined plates. The follower frame abuts against the lifting block, so that the tension spring is in a stretched state. A support plate is connected to the left side of the vertical sliding rail. A clamping plate is slidably connected to the support plate. Two return springs are connected between the clamping plate and the support plate. The outer ends of the inclined plate and the clamping plate are in contact and cooperation.

[0014] A method for using a high-density HDPE pipe forming device includes the following steps: S1: First, build the cooling system. Firmly connect the cooling module with the inlet pipe and outlet pipe of the water delivery component through quick connectors to ensure the smoothness of the coolant circulation path; connect the two ends of the outer cooling pipe to the coolant supply device and the recycler respectively; add HDPE raw materials to the injection module and start the injection module to heat and melt the raw materials. S2: Start the motor to drive the screw rod to convey the molten liquid; manually dock the new and old materials, and push the injection module to move leftward through the electric push rod, so that the docking pipe and the inner cooling pipe are tightly and embeddedly clamped, and at the same time, the spray pipe and the conveying pipe are accurately engaged to complete the double docking of the molten liquid conveying channel and the coolant circulation channel. S3: The screw rod continuously feeds the material, and first injects the molten liquid into the forming channel for forming; at the same time, the cooling module is started, the spray pipe sprays the coolant on the inner wall of the inner cooling pipe, and the outer cooling pipe synchronously cools the periphery of the pipe. The used coolant flows back to the cooling system through the recovery channel and is recycled after temperature reduction treatment. S4: When the formed and cooled pipe is output from the discharge end of the forming module, the controller controls the cutter to descend and move with the pipe for cutting, and the auxiliary clamping plate synchronously clamps; after cutting, the cutter resets and the pipe is collected. S5: After completing the production task, turn off the motor, the injection module and the cooling module in sequence, stop the molten liquid conveying and cooling operations, and make the injection module move rightward to return to its position by starting the electric push rod, clean the equipment, and prepare for the next production.

[0015] Compared with the prior art, the present invention has the following advantages: 1. Through the double cooling system composed of the outer cooling pipe and the inner cooling pipe - spray pipe, synchronous cooling of the inner and outer walls of the HDPE pipe is realized. The outer cooling pipe circulates the coolant to cool the periphery of the pipe, and the inner cooling pipe sprays the coolant evenly onto the inner wall through the spray pipe, effectively avoiding problems such as internal stress concentration and deformation caused by uneven cooling of the pipe, significantly improving the dimensional accuracy, mechanical properties and surface quality of the pipe, and extending the service life of the pipe.

[0016] 2. The device adopts a double-sealed docking structure of a sealing block - return spring and a sealing frame - compression spring. When the injection molding module is docked with the molding module, the channels are connected and sealed through mechanical extrusion, ensuring a reliable connection for the molten liquid transportation and the coolant circulation path; after the operation is completed, the seal is automatically reset to prevent external dust and impurities from entering, avoiding raw material contamination and equipment failures, and ensuring the continuity and stability of the production process.

[0017] 3. The cutting assembly synchronizes the cutting tool with the pipe conveying speed by precisely adjusting the movements of the horizontal slide rail and the vertical slide rail, achieving automated and accurate cutting, and avoiding the errors and low efficiency problems of manual cutting; the clamping plate automatically clamps the pipe during cutting, ensuring the stability of the pipe during the cutting process, reducing defects such as burrs on the cutting surface and uneven cross-sections, and at the same time automatically resetting after cutting is completed, shortening the auxiliary time and significantly improving the overall production efficiency. Brief Description of the Drawings

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 It is a three-dimensional structural schematic diagram of components such as the electric push rod, motor, and docking pipe of the present invention.

[0020] Figure 3 It is a three-dimensional structural schematic diagram of components such as the docking pipe, internal cooling pipe, and screw rod of the present invention.

[0021] Figure 4 It is a three-dimensional structural schematic diagram of components such as the conveying pipe, spray pipe, and ring-shaped frame of the present invention.

[0022] Figure 5 It is a three-dimensional structural schematic diagram of components such as the collar, connecting pipe, and water outlet pipe of the present invention.

[0023] Figure 6 It is a three-dimensional structural schematic diagram of components such as the external cooling pipe, molding module, and internal cooling pipe of the present invention.

[0024] Figure 7 It is a three-dimensional structural schematic diagram of components such as the sealing block, support block, and docking pipe of the present invention.

[0025] Figure 8 It is a three-dimensional structural schematic diagram of components such as the conveying pipe, support ring, and sealing block of the present invention.

[0026] Figure 9 It is an exploded view of components such as the support ring, sealing block, and return spring of the present invention.

[0027] Figure 10 It is a three-dimensional structural schematic diagram of components such as the docking rod, support block, and sealing frame of the present invention.

[0028] Figure 11Schematic diagram of the disengaged sealing state of the docking rod and the sealing frame of the present invention.

[0029] Figure 12 Schematic three-dimensional structure diagram of components such as the vertical slide rail, lifting block, and cutting knife of the present invention.

[0030] Figure 13 Schematic three-dimensional structure diagram of components such as the follower frame, return spring, and clamping plate of the present invention.

[0031] Figure 14 Schematic three-dimensional structure diagram of the follower frame, inclined plate, and tension spring of the present invention.

[0032] Among them, the above-mentioned drawings include the following reference numerals: 1, base; 101, injection molding module; 102, molding module; 1021, filling cavity; 103, electric push rod; 104, motor; 105, docking pipe; 106, internal cooling pipe; 107, screw rod; 201, conveying pipe; 202, nozzle; 203, ring-shaped frame; 204, collar; 205, connecting pipe; 206, water outlet pipe; 207, water inlet pipe; 301, support ring; 302, sealing block; 303, return spring; 304, docking rod; 305, support block; 306, sealing frame; 307, compression spring; 401, support seat; 402, horizontal slide rail; 403, vertical slide rail; 404, lifting block; 405, cutting knife; 501, follower frame; 502, inclined plate; 503, support plate; 504, clamping plate; 505, tension spring; 506, return spring; 6, external cooling pipe. Detailed implementation manners

[0033] Embodiment 1: A high-density HDPE pipe forming device, as Figures 1-6As shown in the figure, it includes a base 1, an injection molding module 101, a forming module 102, an electric push rod 103, a motor 104, a docking pipe 105, an internal cooling pipe 106, a screw rod 107, a delivery pipe 201, a nozzle 202, an external cooling pipe 6, and a water delivery component. The base 1 provides a stable support foundation for the entire device. On the left side of its top, the forming module 102 is fixedly connected. On the right side of the top of the base 1, the injection molding module 101 is slidably connected through a slide rail to realize the left and right movement of the injection molding module 101. On the right side of the injection molding module 101, a motor 104 is installed through a bracket. A screw rod 107 is connected to the output shaft of the motor 104. The screw rod 107 is rotatably arranged inside the injection molding module 101. A molten liquid flow channel is formed between the screw rod 107 and the inner wall of the injection molding module 101, which is used to convey the heated and melted raw material molten liquid. The left end of the screw rod 107 is rotatably connected to the docking pipe 105, and the two are interconnected. On the right side of the forming module 102, an internal cooling pipe 106 is connected through a bracket. The internal cooling pipe 106 is located inside the forming module 102. A pipe fitting forming channel is formed between the outer wall of the internal cooling pipe 106 and the inner wall of the forming module 102. The right side of this channel near the port is a filling cavity 1021. When the forming module 102 is docked with the injection molding module 101, the molten liquid flowing out from the molten liquid flow channel of the injection molding module 101 first fills this filling cavity 1021, and then gradually forms and cools in the pipe fitting forming channel, and finally forms a complete pipe body. A delivery pipe 201 is connected inside the screw rod 107. There is a chamber between the delivery pipe 201 and the inside of the screw rod 107. The inner wall of the delivery pipe 201 is coated with a high-temperature resistant coating, which can effectively isolate the heat transfer of the molten liquid in the injection molding module 101 and ensure the low temperature of the coolant in the delivery pipe 201. A nozzle 202 is rotatably connected inside the internal cooling pipe 106. There is also a chamber between the nozzle 202 and the internal cooling pipe 106. The nozzle 202 adopts a porous design, and the outlet of the hole is designed in the shape of an outward expanding bell mouth. This structure can guide the coolant to be dispersed and sprayed at a specific angle, increasing the spraying coverage area of the coolant, and at the same time reducing the resistance when the coolant is sprayed, so that the coolant can exchange heat with the inner wall of the internal cooling pipe 106 more smoothly and enhance the cooling performance. Two grooves are opened at the left end of the delivery pipe 201, and two protrusions are provided at the right end of the nozzle 202. When the injection molding module 101 drives the delivery pipe 201 to move to the left and dock with the nozzle 202, through the clamping fit of the protrusions and the grooves, the tight connection between the delivery pipe 201 and the nozzle 202 is realized, and when the delivery pipe 201 rotates with the screw rod 107, it can drive the nozzle 202 to rotate synchronously. A water delivery component is provided at the right end of the screw rod 107. An electric push rod 103 is installed on the right side of the top of the base 1 through bolts. The telescopic rod of the electric push rod 103 is connected to the bottom of the injection molding module 101. Through the telescopic action of the electric push rod 103, the left and right movement of the injection molding module 101 is accurately controlled to realize the docking and separation of the injection molding module 101 and the forming module 102. The external cooling pipe 6 is connected around the inside and outside of the forming module 102. The two ports of the external cooling pipe 6 respectively penetrate outside the forming module 102.Both ends of the external cooling pipe 6 are respectively used to connect the coolant water supply device and the coolant water recovery device, so as to realize the circulating flow of the coolant in the external cooling pipe 6, and the external cooling pipe 6 is isolated from the pipe forming channel in the forming module 102.

[0034] As Figures 4-5 shown, the water conveying assembly includes an annular frame 203, a collar 204, a connecting pipe 205, a water outlet pipe 206 and a water inlet pipe 207. Two collars 204 are connected to the outer side of the right end of the screw rod 107. Annular frames 203 are respectively rotatably connected to the parts of the screw rod 107 outside the two collars 204. The annular frame 203 communicates with the collar 204. A through hole is formed in the left collar 204, and the through hole penetrates through the inside of the screw rod 107 for communicating the inside of the left annular frame 203 with the inside of the screw rod 107, and is not communicated with the inside of the conveying pipe 201. The right end of the conveying pipe 201 is connected and communicated with a connecting pipe 205. The connecting pipe 205 penetrates through the screw rod 107 and is connected to the right collar 204 and communicates with the right annular frame 203. The front side of the left annular frame 203 is connected and communicated with a water outlet pipe 206, and the front side of the right annular frame 203 is connected and communicated with a water inlet pipe 207.

[0035] Before the pipe forming process, the construction of the cooling system needs to be completed. Specifically, the cooling module is reliably connected to the water outlet pipe 206 and the water inlet pipe 207 of the water conveying assembly. At the same time, both ends of the external cooling pipe 6 are respectively connected to the coolant water supply device and the coolant water recovery device to ensure the integrity and tightness of the cooling system. Subsequently, the HDPE raw material is added to the injection molding module 101. The injection molding module 101 turns on the heating function. By precisely controlling the heating temperature and time, the HDPE raw material is fully melted and transformed into a molten state with good fluidity, preparing for the subsequent conveying and forming processes.

[0036] Start the motor 104. The motor 104 outputs power to drive the screw rod 107 to rotate. Under the rotation of the screw rod 107, the molten liquid is continuously and stably conveyed in the molten liquid flow channel. At the same time, the rotation of the screw rod 107 drives the connected conveying pipe 201 to rotate synchronously. The rotation of the conveying pipe 201 further drives the collar 204 and the connecting pipe 205 to rotate. Since the annular frame 203 and the collar 204 are designed with a rotational fit, this structure can effectively prevent the rotation of the collar 204 from affecting the connection stability of the water outlet pipe 206 and the water inlet pipe 207 on the annular frame 203, ensuring that the cooling system can operate continuously and stably during the raw material conveying process; before the processing operation, the old material in the forming module 102 needs to be connected to the new material in the injection molding module 101. The screw rod 107 continuously conveys the new material to the left. After the operator completes the connection operation of the old and new materials, start the electric push rod 103. The telescopic rod of the electric push rod 103 starts to extend, driving the injection molding module 101 to move to the left until the injection molding module 101 is docked with the forming module 102. During the docking process, the docking pipe 105 and the inner cooling pipe 106 are embedded and clamped, and the protrusion on the spray pipe 202 is clamped with the groove on the conveying pipe 201, ensuring a tight and reliable connection between the two. After the docking is completed, the screw rod 107 continues to rotate. Since the inner cooling pipe 106 limits the docking pipe 105, the rotation of the screw rod 107 will not drive the docking pipe 105 to rotate; the rotation of the conveying pipe 201 will drive the spray pipe 202 to rotate. The screw rod 107 continuously conveys the molten liquid. The molten liquid first accumulates in the filling cavity 1021. With the continuous pushing of the molten liquid, the molten liquid gradually flows in the pipe forming channel and forms a tubular structure; while the molten liquid is being formed, the cooling system is started synchronously. The cooling module injects the coolant into the water inlet pipe 207. The coolant flows through the right annular frame 203, the connecting pipe 205 and the conveying pipe 201 in sequence under the action of pressure, and finally enters the spray pipe 202. The rotating spray pipe 202 evenly sprays the coolant on the inner wall of the inner cooling pipe 106. The coolant exchanges heat with the molten liquid in the forming channel to realize the cooling and shaping of the inner periphery of the molten liquid. The used coolant flows to the right in the inner cavity of the inner cooling pipe 106, passes through the docking pipe 105 and the inner cavity of the screw rod 107, and flows into the left annular frame 203 through the through hole on the left collar 204, and then flows back to the cooling system through the water outlet pipe 206 for temperature reduction treatment, realizing the recycling of the coolant; at the same time, the coolant water supply device connected to the outer cooling pipe 6 is started synchronously, injecting the coolant into the outer cooling pipe 6. The coolant flows in the outer cooling pipe 6 and exchanges heat with the outer periphery of the forming pipe to realize the cooling of the outer periphery of the pipe. The heated coolant is recovered by the coolant recovery device, completing the circulating flow of the coolant, ensuring that the inside and outside of the pipe are evenly cooled at the same time, effectively reducing the stress concentration inside the pipe, and improving the quality and performance of the pipe through the synergistic effect of the internal and external cooling systems.

[0037] After the pipe is cooled and formed, it is smoothly output from the discharge end at the left end of the forming module 102. Subsequently, the formed HDPE pipe fittings are segmented and collected to meet different production requirements. When the pipe production task is completed, relevant equipment such as the injection molding module 101 and the motor 104 are sequentially shut down, and the conveyance of the coolant is stopped. The electric push rod 103 is started, and the telescopic rod of the electric push rod 103 contracts, driving the injection molding module 101 to move to the right along the slide rail and return to its position. During the movement, the delivery pipe 201 is disengaged from the spray pipe 202, and the docking pipe 105 is also disengaged from the internal cooling pipe 106, returning the device to its initial state and preparing for the next production operation.

[0038] Embodiment 2: On the basis of Embodiment 1, as Figures 7-9 shown, it further includes a support ring 301, a sealing block 302, and a return spring 303. The left end of the delivery pipe 201 and the right end of the spray pipe 202 are respectively connected with a support ring 301. Sealing blocks 302 are respectively slidably connected to the support rings 301. The support rings 301 are in close contact with the sealing blocks 302, thereby blocking the ports of the delivery pipe 201 and the spray pipe 202. A return spring 303 is connected between the sealing blocks 302 and the support rings 301. When the two sealing blocks 302 on both sides come into contact with each other, a mutually squeezing force will be generated, causing the sealing blocks 302 to disengage from the corresponding support rings 301 in the sealed state. At this time, the delivery pipe 201 and the spray pipe 202 are in a communicating state.

[0039] As Figure 7 、 Figure 10 and Figure 11 shown, it further includes a docking rod 304, a support block 305, a sealing frame 306, and a compression spring 307. Support blocks 305 are respectively connected to the inside of the docking pipe 105 and the right end inside the internal cooling pipe 106. A sealing frame 306 is slidably connected to the support blocks 305. A compression spring 307 is provided between the sealing frame 306 and the support blocks 305. Docking rods 304 are respectively connected to the positions on the other side of the support blocks 305 inside the docking pipe 105 and the right end inside the internal cooling pipe 106. The sealing frame 306 is in close contact with the docking rods 304, making the chambers between the docking pipe 105 and the screw rod 107 and the delivery pipe 201 in a sealed state, and the chamber between the internal cooling pipe 106 and the spray pipe 202 is also in a sealed state. The support blocks 305, docking rods 304, and sealing frames 306 on both sides are respectively in sealed rotational cooperation with the corresponding delivery pipe 201 and spray pipe 202. When the two sealing frames 306 approach each other, they will squeeze each other, causing the sealing frame 306 to disengage from the docking rods 304 in the sealed state. At this time, the originally sealed chambers on both sides are in a communicating state.

[0040] In the initial state, the chamber between the screw rod 107 and the delivery pipe 201, as well as the chamber inside the delivery pipe 201, are both in a closed state. Similarly, the chamber between the internal cooling pipe 106 and the nozzle 202, as well as the chamber inside the nozzle 202, are also in a closed state. This sealing design can effectively prevent foreign impurities from entering, ensuring the cleanliness inside the device and the purity of the coolant. When the newly formed material in the injection molding module 101 is docked with the reserved old material in the molding module 102, the molding module 102 moves to the left under the drive of the electric push rod 103 and gradually approaches the injection molding module 101. During this process, the docking pipe 105 and the delivery pipe 201 gradually approach the internal cooling pipe 106. When the sealing blocks 302 on both sides come into contact with each other, as the molding module 102 continues to move, the sealing blocks 302 squeeze against each other and move outward, and the return spring 303 is compressed. At this time, the sealing blocks 302 and the support ring 301 no longer maintain a sealed state, and the delivery pipe 201 and the nozzle 202 are connected. At the same time, the sealing frames 306 on both sides also come into contact with each other, are also squeezed and move outward, and the sealing frames 306 are separated from the docking rods 304 in the sealed state, and the compression spring 307 is compressed, and the docking pipe 105 and the internal cooling pipe 106 are connected. After the delivery pipe 201 and the nozzle 202, and the docking pipe 105 and the internal cooling pipe 106 are connected, the coolant in the delivery pipe 201 is conveyed to the left, enters the nozzle 202, and is evenly sprayed onto the inner wall of the internal cooling pipe 106 by the nozzle 202. The coolant exchanges heat with the formed pipe body to cool down the pipe body. When the operation is completed and the injection molding module 101 and the molding module 102 are separated, the sealing blocks 302 on both sides are separated from each other. The return spring 303 releases its elastic potential energy, rebounds and resets, driving the sealing blocks 302 to move inward and reset, and then tightly abutting against the support ring 301 again to restore the sealed state. At the same time, the sealing frames 306 on both sides are separated from each other, the compression spring 307 rebounds and resets, driving the sealing frames 306 to move inward and reset, and then tightly abutting against the docking rods 304 again to restore the sealed state. This sealing and reset mechanism can ensure the sealing of each channel of the device, effectively prevent the entry of foreign dust and other impurities, extend the service life of the device, and ensure the stable operation of the device.

[0041] As Figure 12As shown in the figure, it further includes a support base 401, a horizontal slide rail 402, a vertical slide rail 403, a lifting block 404 and a cutting knife 405. The left side of the top of the base 1 is connected with the support base 401 by bolts. The support base 401 is located on the left side of the forming module 102. Horizontally slide rails 402 are symmetrically installed at the front and rear of the top of the support base 401 by bolts. A vertical slide rail 403 is slidably connected to the horizontal slide rail 402. A lifting block 404 is slidably connected between the two vertical slide rails 403. The cutting knife 405 is detachably installed at the bottom of the lifting block 404. By adjusting the speed of the horizontal slide rail 402 to make it consistent with the pipe forming speed, and controlling the speed of the vertical slide rail 403 according to the length required for cutting the pipe belt. When the formed and cooled pipe fittings are output to the left from the discharge end of the forming module 102, on the one hand, control the vertical slide rail 403 to drive the lifting block 404 and the cutting knife 405 to move downward, so that the cutting knife 405 cuts the pipe fittings; on the other hand, during the downward movement of the cutting knife 405, the horizontal slide rail 402 drives the vertical slide rail 403, the lifting block 404 and the cutting knife 405 to move to the left as a whole at a speed consistent with the pipe conveying speed. This synchronous movement method can ensure that the neatness of the cutting surface is guaranteed when the cutting knife 405 cuts the pipe fittings, and at the same time adapt to the continuous output of the pipe fittings. After cutting, the vertical slide rail 403 drives the lifting block 404 and the cutting knife 405 to move upward, and the horizontal slide rail 402 drives the vertical slide rail 403, the lifting block 404 and the cutting knife 405 to move to the right and return to their positions to prepare for the next cutting.

[0042] As Figure 13 and Figure 14 shown in the figure, it further includes a follower frame 501, an inclined plate 502, a support plate 503, a clamping plate 504, a tension spring 505 and a return spring 506. The inclined plates 502 are slidably connected to the outer sides of the two vertical slide rails 403. Tension springs 505 are connected between the inclined plates 502 and the corresponding vertical slide rails 403. A follower frame 501 is connected between the right sides of the two inclined plates 502. The follower frame 501 abuts against the lifting block 404, making the tension spring 505 in a stretched state. A support plate 503 is connected to the left side of the vertical slide rail 403. A clamping plate 504 is slidably connected to the support plate 503. The front and rear clamping plates 504 are distributed oppositely and fit the shape of the pipe fittings. Two return springs 506 are connected between the clamping plate 504 and the support plate 503. The outer ends of the inclined plate 502 and the clamping plate 504 are in contact and cooperate with each other.

[0043] When the lifting block 404 drives the cutting knife 405 to move downward to perform the pipe cutting operation, the pressure of the lifting block 404 on the follower frame 501 is released, and the tension spring 505 in the stretched state releases its elastic force, driving the follower frame 501 and the inclined plate 502 to move downward. The inclined plate 502 uses its inclined surface structure to push the clamping plate 504 to move inward. At this time, the return spring 506 is compressed, and the clamping plate 504 gradually clamps the pipe, keeping the pipe in a horizontal state. This process assists the cutting knife 405 to accurately cut the pipe. At the same time, the clamping plate 504 will move to the left along the vertical slide rail 403 to adapt to the movement of the pipe. After cutting, the lifting block 404 drives the cutting knife 405 to move upward, and at the same time pushes the follower frame 501 to move upward. The follower frame 501 then drives the inclined plate 502 to move upward, and the tension spring 505 is stretched again. The acting force of the inclined plate 502 on the clamping plate 504 disappears, and the return spring 506 rebounds and resets, driving the clamping plate 504 to move outward to return to the initial position, waiting for the next cutting operation. This design ensures the stability and accuracy of the cutting process, and improves the quality and efficiency of pipe fitting cutting.

[0044] A method for using a high-density HDPE pipe forming device includes the following steps: S1: First, build the cooling system. Firmly connect the cooling module with the inlet pipe 207 and the outlet pipe 206 of the water delivery component through quick connectors to ensure the smoothness of the coolant circulation path; connect the two ends of the outer cooling pipe 6 to the coolant supply device and the recycler respectively; add HDPE raw materials to the injection molding module 101 and start the injection molding module 101 to heat and melt the raw materials. S2: Start the motor 104 to drive the screw rod 107 to convey the molten liquid; manually connect the new and old materials. Push the injection molding module 101 to move leftward through the electric push rod 103 so that the docking pipe 105 and the inner cooling pipe 106 achieve a tight embedded connection, and at the same time, the spray pipe 202 and the conveying pipe 201 are accurately engaged to complete the double docking of the molten liquid conveying channel and the coolant circulation channel. S3: The screw rod 107 continuously feeds the material, and first injects the molten liquid into the forming channel to form; at the same time, the cooling module is started, the spray pipe 202 sprays coolant on the inner wall of the inner cooling pipe 106, and the outer cooling pipe 6 synchronously cools the periphery of the pipe. The used coolant flows back to the cooling system through the recovery channel and is recycled after temperature reduction treatment. S4: When the formed and cooled pipe is output from the discharge end of the forming module 102, the controller controls the cutting knife 405 to descend and move with the pipe to cut, and the auxiliary clamping plate 504 clamps synchronously; after cutting, the cutting knife 405 resets and the pipe is collected. S5: After completing the production task, turn off the motor 104, the injection molding module 101 and the cooling module in sequence, stop the molten liquid conveying and cooling operations, and make the injection molding module 101 move rightward to return to its position by starting the electric push rod 103, and clean the equipment to prepare for the next production.

Claims

1. A high-density HDPE pipe forming device, comprising a base (1), an injection molding module (101), a forming module (102), an electric push rod (103), a motor (104) and a screw rod (107). A forming module (102) is fixedly connected to the left side of the top of the base (1). An injection molding module (101) is slidably connected to the right side of the top of the base (1) through a slide rail. A motor (104) is installed on the right side of the injection molding module (101) through a bracket. A screw rod (107) is connected to the output shaft of the motor (104). The screw rod (107) is rotatably arranged inside the injection molding module (101). An electric push rod (103) is installed on the right side of the top of the base (1). The telescopic rod of the electric push rod (103) is connected to the bottom of the injection molding module (101). Its characteristic is that, It also includes a docking pipe (105), an internal cooling pipe (106), a conveying pipe (201), a nozzle (202), an external cooling pipe (6) and a water supply component. The left end of the screw rod (107) is rotatably connected to the docking pipe (105), and the two are interconnected. The right side of the forming module (102) is connected to the internal cooling pipe (106) through a bracket. The internal cooling pipe (106) is located inside the forming module (102). The conveying pipe (201) is connected inside the screw rod (107). The nozzle (202) is rotatably connected inside the internal cooling pipe (106). The right end of the screw rod (107) is provided with a water supply component. The external cooling pipe (6) is connected around the inside and outside of the forming module (102), and the two ends of the external cooling pipe (6) respectively penetrate outside the forming module (102).

2. The high-density HDPE pipe forming device according to claim 1, characterized in that, The inner wall of the conveying pipe (201) is coated with a high-temperature resistant coating, which can effectively isolate the heat transfer of the molten liquid in the injection molding module (101).

3. A high-density HDPE pipe forming device according to claim 2, characterized in that, The nozzle (202) adopts a porous design, and the outlet of the hole is designed in the shape of an outward-expanded flared mouth.

4. A high-density HDPE pipe forming device according to claim 3, characterized in that, The water supply component includes an annular frame (203), a collar (204), a connecting pipe (205), a water outlet pipe (206) and a water inlet pipe (207). Two collars (204) are connected to the outer side of the right end of the screw rod (107). The annular frames (203) are respectively rotatably connected to the parts of the screw rod (107) outside the two collars (204). The annular frame (203) communicates with the collar (204). A through hole is opened on the left collar (204), and the through hole penetrates inside the screw rod (107) for communicating the inside of the left annular frame (203) with the inside of the screw rod (107). The right end of the conveying pipe (201) is connected and communicated with the connecting pipe (205). The connecting pipe (205) penetrates the screw rod (107), is connected to the right collar (204), and communicates with the right annular frame (203). The front side of the left annular frame (203) is connected and communicated with the water outlet pipe (206). The front side of the right annular frame (203) is connected and communicated with the water inlet pipe (207).

5. The high-density HDPE pipe forming device according to claim 4, characterized in that, It also includes a support ring (301), a sealing block (302) and a return spring (303). Support rings (301) are respectively connected to the left end of the conveying pipe (201) and the right end of the nozzle (202). Sealing blocks (302) are respectively slidably connected to the support rings (301). The support rings (301) are in close contact with the sealing blocks (302). A return spring (303) is connected between the support rings (301) and the sealing blocks (302). The sealing blocks (302) on both sides are in contact and cooperation.

6. The high-density HDPE pipe forming device according to claim 5, characterized in that, It further includes a docking rod (304), a support block (305), a sealing frame (306) and a compression spring (307). Support blocks (305) are respectively connected to the inside of the docking pipe (105) and the right inner end of the inner cooling pipe (106). A sealing frame (306) is slidably connected to the support block (305). A compression spring (307) is provided between the sealing frame (306) and the support block (305). Docking rods (304) are respectively connected to the positions on the other side of the support blocks (305) at the right inner end of the inside of the docking pipe (105) and the inner cooling pipe (106). The sealing frame (306) is in close contact with the docking rod (304). The support blocks (305), docking rods (304) and sealing frames (306) on both sides are respectively in sealed rotational fit with the corresponding conveying pipes (201) and nozzle pipes (202). The sealing frames (306) on both sides are in contact fit with each other.

7. The forming device for a high-density HDPE pipe according to claim 6, characterized in that, It further includes a support base (401), a horizontal slide rail (402), a vertical slide rail (403), a lifting block (404) and a cutting knife (405). A support base (401) is connected to the left side of the top of the base (1). The support base (401) is located on the left side of the forming module (102). Horizontal slide rails (402) are symmetrically installed on the top of the support base (401). A vertical slide rail (403) is slidably connected to the horizontal slide rail (402). A lifting block (404) is slidably connected between the two vertical slide rails (403). A cutting knife (405) is installed at the bottom of the lifting block (404).

8. The high-density HDPE pipe forming device according to claim 7, characterized in that, It further includes a follower frame (501), an inclined plate (502), a support plate (503), a clamping plate (504), a tension spring (505) and a return spring (506). Inclined plates (502) are slidably connected to the outer sides of the two vertical slide rails (403). Tension springs (505) are respectively connected between the inclined plates (502) and the corresponding vertical slide rails (403). A follower frame (501) is connected between the right sides of the two inclined plates (502). The follower frame (501) abuts against the lifting block (404) to keep the tension spring (505) in a stretched state. A support plate (503) is connected to the left side of the vertical slide rail (403). A clamping plate (504) is slidably connected to the support plate (503). Two return springs (506) are connected between the clamping plate (504) and the support plate (503). The outer ends of the inclined plate (502) and the clamping plate (504) are in contact fit with each other.

9. A method for using a forming device for high-density HDPE pipes, which uses a forming device for high-density HDPE pipes according to any one of claims 1-8, characterized in that, It includes the following steps: S1: First, build the cooling system. Firmly connect the cooling module with the inlet pipe (207) and the outlet pipe (206) of the water conveying component through quick connectors to ensure the smoothness of the coolant circulation path. The two ends of the outer cooling pipe (6) are respectively docked with the coolant supply device and the recycler. Add HDPE raw materials to the injection molding module (101), and start the injection molding module (101) to heat and melt the raw materials. S2: Start the motor (104) to drive the screw rod (107) to convey the molten liquid; manually dock the new and old materials, and push the injection molding module (101) to move left by the electric push rod (103) to enable the docking pipe (105) to be tightly and embeddedly clamped with the internal cooling pipe (106). At the same time, the spray pipe (202) is precisely engaged with the conveying pipe (201) to complete the double docking of the molten liquid conveying channel and the coolant circulation channel; S3: The screw rod (107) continuously feeds the material, and first injects the molten liquid into the molding channel for molding; meanwhile, the cooling module is started, the spray pipe (202) sprays the coolant on the inner wall of the internal cooling pipe (106), and the external cooling pipe (6) synchronously cools the periphery of the pipe. The used coolant flows back to the cooling system through the recovery channel and is recycled after temperature reduction treatment; S4: When the molded and cooled pipe is output from the discharge end of the molding module (102), the controller controls the cutter (405) to descend and move with the pipe for cutting, and the auxiliary clamping plate (504) clamps synchronously; after cutting, the cutter (405) resets to collect the pipe; S5: After completing the production task, turn off the motor (104), the injection molding module (101) and the cooling module in sequence, stop the molten liquid conveying and cooling operations, and make the injection molding module (101) move right to return to its original position by starting the electric push rod (103), clean the equipment, and prepare for the next production.

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