A co-extrusion molding apparatus and molding process for a multi-layer composite water supply pipe

Abstract

The application relates to the technical field of plastic recycling material processing, and discloses a co-extrusion forming device and forming process for a multi-layer composite water supply pipe, which comprises an extruder assembly, a die assembly is arranged at the output end of the extruder assembly, a pulling assembly is arranged at the outlet end of the die assembly, a limiting cooling mechanism is arranged on the pulling assembly, the limiting cooling mechanism comprises a limiting cavity arc plate, the limiting cavity arc plate limits a pipe blank in a pulling process, an arc cavity support plate is movably sleeved in the limiting cavity arc plate, a pressure nozzle is arranged on the arc cavity support plate, the arc cavity support plate cooperates with the limiting cavity arc plate to form a cylinder type framework when the arc cavity support plate is stretched out, the pipe blank is located in the cylinder type framework, the pipe wall is sprayed and cooled by the inside and outside pressure nozzles, and a shearing assembly is further arranged at the outlet end of the die assembly. The device can synchronously spray the inside and outside of the pipe body, the inside and outside of the pipe wall are uniformly stressed in the spraying process, and deformation is prevented.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, and more specifically to a co-extrusion molding equipment and molding process for multi-layer composite water supply pipes. Background Technology

[0002] Plastic waste recycling is an important direction for plastic recycling. Processing recycled plastics for use in the production of multi-layer composite water supply pipes can significantly reduce costs and resource consumption. In the processing of recycled plastic multi-layer composite water supply pipes, the recycled material is crushed, granulated, and dried, and then co-extrusion molding equipment is used to produce multi-layer composite water supply pipes. During production, each layer of raw material enters its corresponding extruder. The raw material is heated, melted, mixed, and pressurized to transform into a uniform molten plastic. Then, the different molten plastics are transported to a multi-layer co-extrusion die to merge. These melts merge at the die outlet, bond together, and form a complete, multi-layer pipe blank. The formed pipe will be gradually pulled out of the co-extrusion die under the drive of the traction device, and will be completely cooled and solidified after being sprayed with coolant; However, in actual processing, the co-extrusion molding process of multi-layer composite water supply pipes under the existing technology still has the following shortcomings; First, when the existing co-extrusion molding equipment pulls the formed pipe, as the length of the pipe increases and the weight of the pipe increases, the pipe is not completely cured at this time. During the pulling process, the pipe is easily deformed by gravity. The existing co-extrusion molding equipment does not have the function of limiting the pipe during pulling. Secondly, in the co-extrusion molding equipment under the existing technology, when cooling and solidifying the formed pipe, coolant is sprayed onto the pipe body. However, the coolant can generally only be sprayed onto the outside of the pipe body, and the inner wall of the pipe cannot be sprayed with coolant. This results in uneven stress on the inside and outside of the pipe wall, which leads to uneven stress on the pipe body during the cooling stage and deformation. Therefore, in order to solve the above problems, it is necessary to provide a co-extrusion molding equipment and molding process for multi-layer composite water supply pipes. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a co-extrusion molding equipment and molding process for multi-layer composite water supply pipes, so as to solve the problems existing in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a co-extrusion molding equipment for multi-layer composite water supply pipes, comprising a plastic recycling crusher, wherein the discharge end of the plastic recycling crusher is connected to an extruder assembly, the output end of the extruder assembly is equipped with a die assembly, the outlet end of the die assembly is provided with a pulling assembly, and the pulling assembly is provided with a limiting cooling mechanism; The limiting cooling mechanism includes a limiting cavity arc plate, which limits the tube blank during the drawing process; An arc-shaped cavity support plate is movably sleeved in the limiting cavity arc plate. A pressure nozzle is installed on the arc-shaped cavity support plate. When the arc-shaped cavity support plate extends, it cooperates with the limiting cavity arc plate to form a cylindrical skeleton. The tube blank is located inside the cylindrical skeleton, and its tube wall is cooled by spraying from the inner and outer pressure nozzles.

[0005] Furthermore, the outlet end of the die assembly is also provided with a shearing component.

[0006] Furthermore, the extruder assembly includes a base plate, a bracket fixedly mounted on the base plate, a material cylinder fixedly mounted on the bracket, a heating element on the material cylinder, a feeding hopper fixedly mounted on the material cylinder, the feeding hopper communicating with the internal space of the material cylinder, a push screw movably sleeved inside the material cylinder, an extrusion motor fixedly mounted on the base plate, the drive shaft of the extrusion motor fixedly connected to the shaft of the push screw, a front mounting plate fixedly mounted on the output end of the material cylinder, the front mounting plate fixedly mounted on the base plate, a base mounted on the bottom of the base plate, and a docking shaft provided at the front end of the base.

[0007] Furthermore, the die head assembly includes a co-extrusion die head, which is fixedly mounted on a front mounting plate. A central flow channel is formed in the co-extrusion die head, and the central flow channel is connected to the output end of the barrel. Side flow channels are formed on both sides of the co-extrusion die head, and injection pipes are fixedly connected to the outer ends of each side flow channel. Insulation holes are formed in the co-extrusion die head, distributed on both sides of the central and side flow channels. Insulation pipes are externally connected to each insulation hole. The cavities of the central and side flow channels converge at the front to form three cavities. A confluence channel is connected to the front cavities of the central and side flow channels. A forming die channel is connected to the front end of the confluence channel. A core mold is provided inside the forming die channel. A support block is fixedly sleeved on the outer side of the forming die channel, and the support block is fixedly mounted on a base.

[0008] Furthermore, the pulling assembly includes a pulling seat, a mating hole on the rear side of the pulling seat, the mating hole fitting with the docking shaft, a track groove on the pulling seat, shaft support plates fixedly installed at both ends of the track groove, a pulling screw movably sleeved between the shaft support plates, a pulling motor installed at the front end of the pulling seat, the drive shaft of the pulling motor fixedly connected to the shaft of the pulling screw, a pulling head movably sleeved in the track groove, and the pulling head threadedly driven into the pulling screw.

[0009] Furthermore, the pulling head is provided with a cross-shaped rail groove, and two symmetrical soft arc chucks are movably sleeved in each of the four grooves of the cross-shaped rail groove. A shaft block is fixedly installed at the end of each groove, and a short lead screw is movably sleeved on each shaft block. The short lead screw is located in each of the four grooves and is threadedly driven by the two soft arc chucks at that location. The two individual soft arc chucks in the same groove have opposite thread directions. The driving state of each pair of soft arc chucks in the four grooves is consistent. Four mounting plates are fixedly installed on the outside of the pulling head, and a clamping motor is fixedly installed on the mounting plate. The drive shaft of the clamping motor passes through the mounting plate and is connected to the short lead screw. The pulling head is provided with four evenly distributed outer arc openings and four evenly distributed inner arc openings. A tube blank is extruded at the forming die.

[0010] Furthermore, the limiting cooling mechanism includes an end plate, which is fixedly installed at the front end of the traction seat. Eight evenly distributed limiting cavity arc plates are fixedly installed on the end plate, arranged in an alignment of four inner and four outer sections. The four outer arc plates are movably sleeved with the outer arc opening, and the four inner arc plates are movably sleeved with the inner arc opening. One side of each limiting cavity arc plate has a sleeve opening communicating with the internal cavity, and the other side of each limiting cavity arc plate has a fitting groove. The inner surface of the limiting cavity arc plate is uniformly distributed and movably sleeved with arc-shaped cavity support plates. The arc-shaped cavity support plates are movably sleeved with the sleeve opening. When the arc-shaped cavity support plates extend outward, their ends fit with adjacent matching grooves. The root side walls of the arc-shaped cavity support plates are provided with slots. Limiting strips are provided on both outer sides of the arc-shaped cavity support plates. Elastic reset members are connected between the inner top of the arc-shaped cavity support plates and the inner bottom of the limiting cavity arc plate. Pressure nozzles are installed on the inner surface of the outer individual of the limiting cavity arc plate and the outer surface of its inner individual. The pressure nozzles are radially aligned.

[0011] Furthermore, a water box is fixedly installed on the outer side of the end plate, the water box is connected to the limiting cavity arc plate, a water tank is fixedly installed on the outer side of the traction seat, a pressure pump is provided in the water tank, and a liquid pipe is connected between the output end of the pressure pump and the water box.

[0012] Furthermore, the shearing assembly includes column plates, which are fixedly installed on both sides of the traction seat. A top frame is fixedly installed between the upper ends of the column plates. A cutter is movably sleeved in the top frame. A shearing motor is fixedly installed at the upper end of the top frame. The drive shaft of the shearing motor is connected to the cutter. A storage groove aligned with the cutter is provided in the traction seat.

[0013] The technical effects and advantages of this invention are as follows: By connecting the discharge end of the plastic recycling crusher with the extruder, the recycling and remolding processes of waste plastics can be quickly integrated, improving the processing efficiency of waste plastics. When the soft arc chuck on the pulling head clamps the tube blank and pulls it forward, the tube body of the tube blank will enter between the inner and outer limiting cavity arc plates and be limited by the limiting cavity arc plates, thereby preventing the tube body from bending due to gravity during the pulling process. When the pulling head reaches the end plate, the pulling process of the tube blank ends, and the tube body is positioned between the inner and outer limiting cavity arc plates. At this time, the pressure pump starts and injects the coolant in the water tank into the limiting cavity arc plate through the liquid pipe. The coolant enters the interior of the arc-shaped cavity support plate through the slot. Under the action of water pressure, the arc-shaped cavity support plate extends from the sleeve and finally fits into the adjacent fitting groove. The inner and outer arc-shaped cavity support plates, together with the inner and outer limiting cavity arc plates, form a cylindrical skeleton. Under the continuous action of water pressure, the coolant is sprayed out towards the tube body through the pressure nozzles on both sides of the tube wall, thereby spraying the tube body synchronously on both the inner and outer sides. This ensures that the inner and outer sides of the tube wall are evenly stressed during the spraying process, preventing deformation. Furthermore, the cylindrical skeleton can improve the stability of the device during the spraying process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the extruder assembly structure of the present invention; Figure 3 This is a schematic cross-sectional view of the extruder assembly of the present invention; Figure 4 This is a schematic diagram of the mold head assembly structure of the present invention; Figure 5 This is a schematic cross-sectional view of the mold head assembly of the present invention; Figure 6 This is a schematic diagram of the traction component structure of the present invention; Figure 7 This is a schematic diagram of the structure of the traction head of the present invention; Figure 8 This is a schematic diagram of the limiting cooling mechanism of the present invention; Figure 9This is a schematic diagram of the cross-sectional structure of the limiting cavity arc plate of the present invention; Figure 10 This is a schematic diagram of the cross-sectional structure of the arc-shaped cavity support plate of the present invention; Figure 11 This is a schematic diagram of the water tank structure of the present invention; Figure 12 This is a schematic diagram of the arc-shaped cavity support plate in the extended state of the present invention; Figure 13 This is a schematic cross-sectional view of the arc-shaped cavity support plate in the extended state of the present invention; Figure 14 This is a schematic diagram of the shearing component structure of the present invention.

[0015] The attached figures are labeled as follows: 1. Extruder assembly; 101. Base plate; 102. Support; 103. Barrel; 104. Heating element; 105. Feed hopper; 106. Push screw; 107. Extrusion motor; 108. Front mounting plate; 109. Base; 110. Connecting shaft; 2. Die head assembly; 201. Co-extrusion die head; 202. Central runner; 203. Side runner; 204. Injection pipe; 205. Insulation hole; 206. Insulation pipe; 207. Manifold; 208. Forming die runner; 209. Support block; 3. Traction assembly; 301. Traction seat; 302. Connecting hole; 303. Track groove; 304. Shaft support plate; 305. Traction screw; 306. Traction motor; 307. 308. Pulling head; 309. Cross rail groove; 310. Soft arc chuck; 311. Shaft block; 312. Short lead screw; 313. Mounting plate; 314. Clamping motor; 315. Outer arc opening; 316. Inner arc opening; 317. Tube blank; 4. Limiting cooling mechanism; 401. End plate; 402. Limiting cavity arc plate; 403. Fitting groove; 404. Arc-shaped cavity support plate; 405. Groove; 406. Limiting strip; 407. Elastic reset component; 408. Pressure nozzle; 409. Water box; 410. Water tank; 411. Pressure pump; 412. Liquid pipe; 5. Shearing assembly; 501. Column plate; 502. Top frame; 503. Cutter; 504. Shearing motor; 505. Storage groove. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The co-extrusion molding equipment and molding process for multi-layer composite water supply pipes involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Reference Figure 1The present invention provides a co-extrusion molding equipment and molding process for multi-layer composite water supply pipes, including a plastic recycling crusher (not shown in the figure), an extruder assembly 1 connected to the discharge end of the plastic recycling crusher, a die assembly 2 installed at the output end of the extruder assembly 1, a pulling assembly 3 provided at the outlet end of the die assembly 2, a limiting cooling mechanism 4 provided on the pulling assembly 3, and a shearing assembly 5 provided at the outlet end of the die assembly 2. Plastic recycling crushers are the core pre-processing equipment for waste plastic recycling. Their core function is to crush large pieces of waste plastic into uniform small particles. After the waste plastic is fed into the crusher, the electric motor drives the cutter roller to rotate at high speed. The moving blades and the fixed blades fixed in the cavity form continuous shearing, tearing and squeezing. The material is repeatedly subjected to force in the crushing chamber and is gradually refined to the target particle size. Since plastic recycling crushers are a conventional technology known to those skilled in the art, the specific structure and working principle of the equipment will not be described in detail in the embodiments. When the device is in use, recycled plastic waste particles enter the extruder assembly 1, where they are heated, melted, mixed, and pressurized to transform into a uniform molten plastic. Different types of molten plastic enter the die assembly 2, where they are mixed and bonded together to form a complete, multi-layered tube blank. Under the conveying of the extruder assembly 1, the tube blank is discharged from the outlet end of the die assembly 2. The pulling assembly 3 can pull the tube blank, the limiting and cooling mechanism 4 is used to provide limiting and cooling for the tube body, and the shearing assembly 5 cuts the pulled tube.

[0018] Reference Figure 2 and Figure 3 The extruder assembly 1 includes a base plate 101, a bracket 102 fixedly mounted on the base plate 101, a barrel 103 fixedly mounted on the bracket 102, a heating element 104 provided on the barrel 103, a feeding hopper 105 fixedly mounted on the barrel 103, the feeding hopper 105 communicating with the internal space of the barrel 103, a push screw 106 movably sleeved inside the barrel 103, an extrusion motor 107 fixedly mounted on the base plate 101, the drive shaft of the extrusion motor 107 fixedly connected to the shaft of the push screw 106, a front mounting plate 108 fixedly mounted on the output end of the barrel 103, the front mounting plate 108 fixedly mounted on the base plate 101, a base 109 mounted on the bottom of the base plate 101, and a docking shaft 110 provided at the front end of the base 109. When the device is in use, recycled plastic waste particles are fed into the inside of the barrel 103 from the feeding hopper 105. The extrusion motor 107 drives the push screw 106 to rotate. The heating element 104 heats the plastic raw material. Through the heating of the heating element 104 and the shearing action of the push screw 106, the raw material is heated, melted, mixed and transformed into a uniform molten plastic. Under the rotating pushing action of the push screw 106, the molten plastic is discharged from the front output end of the barrel 103. Since this structure is a conventional technical means known to those skilled in the art, its specific working principle will not be described in detail in this embodiment.

[0019] Reference Figure 4 and Figure 5 The die assembly 2 includes a co-extrusion die 201, which is fixedly mounted on the front mounting plate 108. A central flow channel 202 is formed in the co-extrusion die 201, which is connected to the output end of the barrel 103. Side flow channels 203 are formed on both sides of the co-extrusion die 201, and injection pipes 204 are fixedly connected to the outer ends of each side flow channel 203. Thermal insulation holes 205 are formed in the co-extrusion die 201, distributed in the central flow channel 202 and the side flow channels 203. On both sides, the insulation holes 205 are connected to the insulation pipes 206. The cavity layers of the middle flow channel 202 and the side flow channel 203 merge at the front to form a three-layer cavity. The front cavity of the middle flow channel 202 and the side flow channel 203 is connected to the confluence channel 207. The front end of the confluence channel 207 is connected to the molding mold channel 208. The mold channel 208 is provided with a core mold (not shown in the figure). The outer side of the molding mold channel 208 is fixedly sleeved with a support block 209. The support block 209 is fixedly installed on the base 109. When the device is in use, different types of recycled plastic waste particles are injected into the co-extrusion die 201 from the injection pipes 204 on both sides and the material cylinder 103 in the middle. The raw materials flow in the side channels 203 on both sides and the middle channel 202 in the middle. After passing through the front cavity, they converge in the confluence channel 207. The molten plastic that has converged is in a multi-layer state. Then it enters the forming die channel 208. The melt flows around the core mold to form the inner wall of the pipe and is formed in the forming die channel 208 to form a multi-layer composite pipe blank. Since the above-mentioned device is a conventional technical means used by those skilled in the art, the specific structure and working principle of its molding die will not be described in detail in this embodiment.

[0020] Reference Figure 6 and Figure 7The traction assembly 3 includes a traction seat 301, with a mating hole 302 on the rear side of the traction seat 301, which fits into the mating shaft 110. A track groove 303 is provided on the traction seat 301, with shaft support plates 304 fixedly installed at both ends of the track groove 303. A traction screw 305 is movably sleeved between the shaft support plates 304. A traction motor 306 is installed at the front end of the traction seat 301, with the drive shaft of the traction motor 306 fixedly connected to the shaft of the traction screw 305. A traction head 307 is movably sleeved in the track groove 303, and the traction head 307 is threadedly connected to the traction screw 305. A cross rail groove 308 is provided on the traction head 307, with two symmetrical soft arc clamps 309 movably sleeved in each of the four grooves of the cross rail groove 308. A shaft block 310 is fixedly installed at the end of each channel. A short lead screw 311 is movably sleeved on each shaft block 310. The short lead screw 311 is located in each of the four channels and is threadedly driven by two soft arc chucks 309 at that location. The two individual soft arc chucks 309 located in the same channel have opposite thread directions. The driving state of each pair of soft arc chucks 309 in the four channels is consistent. Four mounting plates 312 are fixedly installed on the outside of the pulling head 307. A clamping motor 313 is fixedly installed on the mounting plate 312. The drive shaft of the clamping motor 313 passes through the mounting plate 312 and is connected to the short lead screw 311. The pulling head 307 has four evenly distributed outer arc openings 314 and four evenly distributed inner arc openings 315. A tube blank 316 is extruded at the forming die channel 208. When the device is in use, when the tube blank 316 is extruded from the forming die 208, the traction motor 306 drives the traction screw 305 to rotate, thereby driving the traction head 307 to move backward to the tube opening of the tube blank 316. At this time, the clamping motors 313 on the four sides drive the four short screws 311 to rotate, thereby driving each pair of soft arc chucks 309 to move closer to each other and clamp the inner wall of the tube opening of the tube blank 316. Then, through the driving action of the traction motor 306, the traction head 307 is gradually driven forward, thereby pulling the gradually extruded tube blank, thus realizing the pulling effect on the tube blank.

[0021] Reference Figures 8-13The limiting cooling mechanism 4 includes an end plate 401, which is fixedly installed at the front end of the traction seat 301. Eight evenly distributed limiting cavity arc plates 402 are fixedly installed on the end plate 401, with four inner arc plates aligned with four outer arc plates. The four outer arc plates 402 are movably sleeved with outer arc openings 314, and the four inner arc plates 402 are movably sleeved with inner arc openings 315. A sleeve opening is provided on one side of each limiting cavity arc plate 402, communicating with the internal cavity. A fitting groove 403 is provided on the other side of each limiting cavity arc plate 402. Arc-shaped cavity support plates 404 are evenly distributed and movably sleeved inside each limiting cavity arc plate 402, movably sleeved with the sleeve openings. When 404 extends outward, its end engages with the adjacent engagement groove 403. The two side walls of the root of the arc-shaped cavity support plate 404 are provided with slots 405. Limiting strips 406 are provided on both outer sides of the arc-shaped cavity support plate 404. Elastic reset members 407 are connected between the inner top of the arc-shaped cavity support plate 404 and the inner bottom of the limiting cavity arc plate 402. Pressure nozzles 408 are installed on the inner side of the outer individual of the limiting cavity arc plate 402 and on the outer side of its inner individual. The pressure nozzles 408 are radially aligned. A water box 409 is fixedly installed on the outer side of the end plate 401. The water box 409 is connected to the limiting cavity arc plate 402. A water tank 410 is fixedly installed on the outer side of the pulling seat 301. A pressure pump 411 is provided in the water tank 410. A liquid pipe 412 is connected between the output end of the pressure pump 411 and the water box 409. When the device is in use, when the flexible arc chuck 309 on the pulling head 307 clamps the tube blank 316 and pulls it forward, the tube body of the tube blank 316 will enter between the inner and outer limiting cavity arc plates 402 and be limited by the limiting cavity arc plates 402, thereby preventing the tube body from bending due to gravity during the pulling process. When the pulling head 307 moves to the end plate 401, the pulling process of the tube blank 316 ends, and the tube body of the tube blank 316 is between the inner and outer limiting cavity arc plates 402. At this time, the pressure pump 411 starts to inject the coolant in the water tank 410 into the limiting cavity arc plate through the liquid pipe 412. In section 402, coolant enters the interior of the arc-shaped cavity support plate 404 through the slot 405. Under water pressure, the arc-shaped cavity support plate 404 extends from the sleeve opening and finally fits into the adjacent fitting groove 403. The inner and outer arc-shaped cavity support plates 404, together with the inner and outer limiting cavity arc plates 402, form a cylindrical skeleton. Under the continuous action of water pressure, coolant is sprayed out towards the pipe body through the pressure nozzles 408 on both sides of the pipe wall, thereby spraying the pipe body synchronously on the inner and outer sides. This ensures that the pipe body is subjected to uniform force on the inner and outer sides during the spraying process, preventing deformation. Furthermore, the cylindrical skeleton can improve the stability of the device during the spraying process.

[0022] Reference Figure 14The shearing assembly 5 includes a column plate 501, which is fixedly installed on both sides of the traction seat 301. A top frame 502 is fixedly installed between the upper ends of the column plate 501. A cutter 503 is movably sleeved in the top frame 502. A shearing motor 504 is fixedly installed at the upper end of the top frame 502. The drive shaft of the shearing motor 504 is connected to the cutter 503. A storage groove 505 aligned with the cutter 503 is provided in the traction seat 301. When the device is in use, after the tube blank 316 is pulled, the shearing motor 504 can drive the cutter 503 to move downward to shear the tube blank 316. The storage groove 505 stores the cutter 503 that has moved to the bottom. The device realizes the shearing function of the tube blank 316 in the above manner.

[0023] The working principle of this invention is as follows: When the tube blank 316 is extruded from the forming die 208, the traction motor 306 drives the traction screw 305 to rotate, thereby driving the traction head 307 to move backward to the tube opening of the tube blank 316. At this time, the clamping motors 313 on the four sides drive the four short screws 311 to rotate, thereby driving each pair of soft arc clamps 309 to move closer to each other and clamp the inner wall of the tube opening of the tube blank 316. Then, through the driving action of the traction motor 306, the traction head 307 is gradually driven forward, thereby pulling the gradually extruded tube blank, thus realizing the pulling action of the tube blank. When the flexible arc chuck 309 on the pulling head 307 clamps the tube blank 316 and pulls it forward, the tube body of the tube blank 316 will enter between the inner and outer limiting cavity arc plates 402 and be limited by the limiting cavity arc plates 402, thereby preventing the tube body from bending due to gravity during the pulling process. When the pulling head 307 moves to the end plate 401, the pulling process of the tube blank 316 ends, and the tube body of the tube blank 316 is between the inner and outer limiting cavity arc plates 402. At this time, the pressure pump 411 starts to inject the coolant in the water tank 410 into the limiting cavity arc plate 402 through the liquid pipe 412. Coolant enters the interior of the arc-shaped cavity support plate 404 through the slot 405. Under the action of water pressure, the arc-shaped cavity support plate 404 extends from the sleeve and finally fits into the adjacent fitting groove 403. The inner and outer arc-shaped cavity support plates 404, together with the inner and outer limiting cavity arc plates 402, form a cylindrical skeleton. Under the continuous action of water pressure, coolant is sprayed out towards the pipe body through the pressure nozzles 408 on both sides of the pipe wall, thereby spraying the pipe body synchronously on the inner and outer sides. This ensures that the pipe body is subjected to uniform force on the inner and outer sides during the spraying process, preventing deformation. In addition, the cylindrical skeleton can improve the stability of the device during the spraying process. After the tube blank 316 is pulled, the shearing motor 504 can drive the cutter 503 to move downward to shear the tube blank 316. The storage groove 505 stores the cutter 503 that has moved to the bottom. The device realizes the shearing function of the tube blank 316 in the above manner.

[0024] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A co-extrusion molding equipment for multi-layer composite water supply pipes, comprising a plastic recycling crusher, wherein the discharge end of the plastic recycling crusher is connected to an extruder assembly (1), the output end of the extruder assembly (1) is equipped with a die assembly (2), and the outlet end of the die assembly (2) is provided with a pulling assembly (3), characterized in that: The traction assembly (3) is provided with a limiting cooling mechanism (4); The limiting cooling mechanism (4) includes a limiting cavity arc plate (402), which limits the tube blank during the drawing process; An arc-shaped cavity support plate (404) is movably sleeved in the limiting cavity arc plate (402). A pressure nozzle (408) is installed on the arc-shaped cavity support plate (404). When the arc-shaped cavity support plate (404) extends, it cooperates with the limiting cavity arc plate (402) to form a cylindrical skeleton. The tube blank is located inside the cylindrical skeleton, and its tube wall is cooled by spraying from the inner and outer pressure nozzles (408).

2. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 1, characterized in that: The exit end of the die assembly (2) is also provided with a shearing assembly (5).

3. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 2, characterized in that: The extruder assembly (1) includes a base plate (101), a bracket (102) fixedly mounted on the base plate (101), a barrel (103) fixedly mounted on the bracket (102), a heating element (104) provided on the barrel (103), a feeding hopper (105) fixedly mounted on the barrel (103), the feeding hopper (105) communicating with the internal space of the barrel (103), and a push screw movably connected inside the barrel (103). 106), an extrusion motor (107) is fixedly installed on the base plate (101), the drive shaft of the extrusion motor (107) is fixedly connected to the shaft of the push screw (106), a front mounting plate (108) is fixedly installed at the output end of the barrel (103), the front mounting plate (108) is fixedly installed on the base plate (101), a base (109) is installed at the bottom of the base plate (101), and a docking shaft (110) is provided at the front end of the base (109).

4. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 3, characterized in that: The die assembly (2) includes a co-extrusion die (201), which is fixedly mounted on the front mounting plate (108). A central flow channel (202) is provided in the co-extrusion die (201), which is connected to the output end of the barrel (103). Side flow channels (203) are provided on both sides of the co-extrusion die (201), and injection pipes (204) are fixedly connected to the outer ends of the side flow channels (203). Insulation holes (205) are provided in the co-extrusion die (201), which are distributed in the central flow channel (202) and the side flow channels (204). On both sides of the flow channel (203), the heat insulation hole (205) is externally connected to the heat insulation pipe (206). The cavity layers of the middle flow channel (202) and the side flow channel (203) merge at the front to form a three-layer cavity. The front cavity of the middle flow channel (202) and the side flow channel (203) is connected to the confluence channel (207). The front end of the confluence channel (207) is connected to the molding mold channel (208). The mold is provided with a core mold inside the molding mold channel (208). A support block (209) is fixedly sleeved on the outside of the molding mold channel (208). The support block (209) is fixedly installed on the base (109).

5. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 4, characterized in that: The traction assembly (3) includes a traction seat (301), a mating hole (302) is provided on the rear side of the traction seat (301), the mating hole (302) is fitted with the docking shaft (110), a track groove (303) is provided on the traction seat (301), a shaft support plate (304) is fixedly installed at both ends of the track groove (303), a traction screw (305) is movably sleeved between the shaft support plates (304), a traction motor (306) is installed at the front end of the traction seat (301), the drive shaft of the traction motor (306) is fixedly connected to the shaft of the traction screw (305), a traction head (307) is movably sleeved in the track groove (303), and the traction head (307) is threadedly sleeved with the traction screw (305).

6. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 5, characterized in that: The pulling head (307) is provided with a cross rail groove (308). Two symmetrical soft arc chucks (309) are movably sleeved in each of the four channels of the cross rail groove (308). A shaft block (310) is fixedly installed at the end of each channel of the cross rail groove (308). A short lead screw (311) is movably sleeved on each shaft block (310). The short lead screw (311) is located in each of the four channels and is threadedly driven by the two soft arc chucks (309) there. The two individual soft arc chucks (309) in the same channel have opposite thread directions. The driving state of each pair of soft arc chucks (309) in the four channels is the same. Four mounting plates (312) are fixedly installed on the outer side of the pulling head (307). A clamping motor (313) is fixedly installed on the mounting plate (312). The drive shaft of the clamping motor (313) passes through the mounting plate (312) and is connected to the short lead screw (311). Four evenly distributed outer arc openings (314) are opened on the pulling head (307). Four evenly distributed inner arc openings (315) are opened on the pulling head (307). A tube blank (316) is extruded at the forming die (208).

7. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 6, characterized in that: The limiting cooling mechanism (4) includes an end plate (401), which is fixedly installed at the front end of the traction seat (301). The end plate (401) is fixedly installed with uniformly distributed limiting cavity arc plates (402). There are eight limiting cavity arc plates (402). The limiting cavity arc plates (402) are arranged with four on the inner side and four on the outer side. The four limiting cavity arc plates (402) on the outer side are movably connected to the outer arc opening (314), and the four limiting cavity arc plates (402) on the inner side are movably connected to the inner arc opening (315). One side of the limiting cavity arc plate (402) is provided with a sleeve opening, which communicates with the internal cavity. The other side of the limiting cavity arc plate (402) is provided with a fitting groove (403). Arc-shaped cavity support plates (404) are evenly distributed and movably sleeved inside the limiting cavity arc plate (402). The arc-shaped cavity support plates (404) are movably sleeved with the sleeve opening. When the arc-shaped cavity support plates (404) extend outward, their ends fit with the adjacent fitting grooves (403). The root side walls of 04) are provided with slots (405), and the two outer sides of the arc-shaped cavity support plate (404) are provided with limiting strips (406). The inner top of the arc-shaped cavity support plate (404) and the inner bottom of the limiting cavity arc plate (402) are connected with elastic reset members (407). Pressure nozzles (408) are installed on the inner side of the outer individual of the limiting cavity arc plate (402) and the outer side of its inner individual. The pressure nozzles (408) are radially aligned.

8. The co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 7, characterized in that: A water box (409) is fixedly installed on the outside of the end plate (401). The water box (409) is connected to the limiting cavity arc plate (402). A water tank (410) is fixedly installed on the outside of the traction seat (301). A pressure pump (411) is provided in the water tank (410). A liquid pipe (412) is connected between the output end of the pressure pump (411) and the water box (409).

9. A co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 8, characterized in that: The shearing assembly (5) includes a column plate (501), which is fixedly installed on both sides of the traction seat (301). A top frame (502) is fixedly installed between the upper ends of the column plate (501). A cutter (503) is movably sleeved in the top frame (502). A shearing motor (504) is fixedly installed at the upper end of the top frame (502). The drive shaft of the shearing motor (504) is connected to the cutter (503). A storage groove (505) aligned with the cutter (503) is provided in the traction seat (301).

10. The molding process of a co-extrusion molding equipment for multi-layer composite water supply pipes according to claim 9, characterized in that, Includes the following steps: S1. After the waste plastic is put into the crusher, the motor drives the cutter roller to rotate at high speed. The moving blade and the fixed blade fixed in the cavity form continuous shearing, tearing and squeezing. The material is repeatedly subjected to force in the crushing chamber and gradually refined to the target particle size. S2. Recycled plastic waste particles enter the extruder assembly (1) and are heated, melted, mixed and pressurized in the extruder assembly (1) to be transformed into uniform molten plastic. Different types of molten plastic enter the die assembly (2) to mix and bond together to form a complete, multi-layered tube blank. S3. When the tube blank (316) is extruded from the forming die (208), the traction motor (306) drives the traction screw (305) to rotate, thereby driving the traction head (307) to move backward to the tube opening of the tube blank (316). At this time, the clamping motors (313) on the four sides drive the four short screws (311) to rotate, thereby driving each pair of soft arc chucks (309) to move closer to each other and clamp the inner wall of the tube opening of the tube blank (316). Then, through the driving action of the traction motor (306), the traction head (307) is gradually driven forward, thereby pulling the gradually extruded tube blank. S4. When the soft arc chuck (309) on the pulling head (307) clamps the tube blank (316) and pulls it forward, the tube body of the tube blank (316) will enter between the inner and outer limiting cavity arc plates (402) and be limited by the limiting cavity arc plates (402); S5. When the pulling head (307) moves to the end plate (401), the pulling process of the tube blank (316) ends, and the tube body of the tube blank (316) is between the inner and outer limiting cavity arc plates (402). At this time, the pressure pump (411) starts to inject the coolant in the water tank (410) into the limiting cavity arc plate (402) through the liquid pipe (412). The coolant enters the interior of the arc-shaped cavity support plate (404) through the slot (405). Under the action of water pressure, the arc-shaped cavity support plate (404) moves... The sleeve extends from the sleeve opening and finally fits into the adjacent fitting groove (403). The inner and outer arc-shaped cavity support plate (404) and the inner and outer limiting cavity arc plate (402) form a cylindrical skeleton. Under the continuous action of water pressure, the coolant is sprayed out towards the pipe body at the pressure nozzles (408) on both sides of the pipe wall, thereby spraying the pipe body synchronously on the inner and outer sides. During the spraying process, the inner and outer sides of the pipe wall are subjected to uniform force to prevent deformation. In addition, the cylindrical skeleton can improve the stability of the device during the spraying process. S6. After the tube blank (316) is pulled, the shearing motor (504) can drive the cutter (503) to move downward to shear the tube blank (316). The storage groove (505) stores the cutter (503) that has moved to the bottom. The device realizes the shearing function of the tube blank (316) in the above manner.

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