PP hollow grid plate production extruder based on recycled plastic regeneration

Abstract

The invention relates to the technical field of hollow plate forming extrusion, and discloses a PP hollow grid plate production extruder based on recycled plastic regeneration, which comprises an extruder base, a charging barrel arranged on the top of the extruder base, a hopper arranged on the top of the charging barrel, an extrusion head arranged on one side of the extruder base, and a connecting pipe arranged between the charging barrel and the extrusion head, and the extrusion discharging component is arranged on the connecting pipe. According to the PP hollow grid plate production extruder based on recycled plastic regeneration, through full-process extrusion cleaning of the extrusion discharging assembly, mixing of residual condensate and new melt is reduced, the extruded PP hollow grid plate is uniform in thickness and free of surface flaws, and the qualified rate of regenerated material products is remarkably increased. The core problem that after a traditional extruder is shut down, residual molten plastic is solidified to block a pipeline is effectively solved. Melt conveying blocking caused to next production after the residual plastic is cooled and cured is avoided, disassembly for cleaning is not needed, and the equipment maintenance cost and shutdown loss are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of hollow board forming and extrusion technology, and in particular to an extruder for producing PP hollow boards based on recycled plastic. Background Technology

[0002] Driven by the "dual carbon" goals and the "plastic ban" policy, the recycling and reuse of plastics has become a core direction of green development. PP hollow fiberboard, with its lightweight and recyclable advantages, is widely used in logistics packaging, construction, and other fields. This model not only solves the problem of "white pollution" from waste plastics but also reduces dependence on virgin petroleum resources, aligning with the concept of a circular economy. Current recycling technologies are continuously upgrading, enabling recycled materials to further improve resource utilization while ensuring the performance of the boards, helping the industry achieve a win-win situation for environmental protection and economic benefits, resulting in a steady increase in market demand. The production process of hollow fiberboard requires the use of extruders to extrude the hollow fiberboard. However, existing extruders still have the following shortcomings: In the extrusion production of PP hollow sheets and other plastic products, the core working logic of the extruder is to melt plastic granules through barrel heating and screw shearing, and then continuously inject the uniform molten plastic into the extruder head, completing the product processing through die forming, cooling and shaping, and other processes. However, when the equipment is shut down, this continuous production process is interrupted, which easily leads to the problem of molten plastic residue in the pipeline. As the heating system of the barrel, connecting pipes and extruder head is gradually shut down after shutdown, the temperature continues to drop. The molten plastic that has not been completely discharged from the pipeline loses its heat support and gradually loses its fluidity, slowly solidifying and adhering to the inner wall of the pipeline, the corners of the flow channel, and the die opening of the extruder head. These solidified plastic residues are hard and will firmly adhere to the inner wall of the pipeline, forming stubborn blockages. When production is restarted, the newly heated molten plastic will be directly blocked by these solidified residues during the process of conveying it to the extruder head. This will not only cause a significant increase in melt conveying resistance, affecting the stability of extrusion pressure, but may also cause uneven melt flow, resulting in quality problems such as thickness deviation and surface defects in the formed sheets. In severe cases, the solidified residue can completely block the pipes, preventing the melt from being transported normally. This necessitates shutdown, disassembly, and cleaning, which delays production and increases equipment maintenance costs and raw material losses. Summary of the Invention

[0003] Given the existing technology where molten plastic residue in the pipes solidifies and adheres as the temperature drops, the solidified residue will block the delivery of new melt when the machine is started again, leading to unstable extrusion pressure, product quality defects, and in severe cases, pipe blockage, requiring disassembly and cleaning, which increases maintenance costs and production losses, a new PP hollow board production extruder based on recycled plastic is proposed.

[0004] This application provides an extruder for producing PP hollow core boards based on recycled plastic. Its purpose is to solve the problem of residual solidified and blocked molten recycled PP material in the pipeline after shutdown, ensure smooth conveying of melt during the next startup, reduce disassembly and cleaning costs and production losses, and improve product quality stability and resource recycling rate.

[0005] The technical solution of the present invention is as follows: an extruder for producing PP hollow board based on recycled plastic, including an extruder base, a material cylinder provided on the top of the extruder base, a hopper provided on the top of the material cylinder, an extrusion head provided on one side of the extruder base, a connecting pipe provided between the material cylinder and the extrusion head, and an extrusion discharge component provided on the connecting pipe. The extrusion discharge component includes an extrusion discharge assembly disposed within a connecting pipe, and the extrusion discharge assembly is provided with a rotating assembly, an anti-blocking assembly, and a pushing assembly. The extrusion discharge component is used to extrude the molten plastic remaining in the connecting pipe. The extrusion discharge assembly includes two outer cylinders symmetrically distributed inside the connecting pipe, and an inner cylinder is provided inside each of the two outer cylinders. Several first discharge ports are arranged in a ring array on the outer cylinders, and several second discharge ports are arranged in a ring array on the inner cylinders.

[0006] Furthermore, the rotating assembly includes a rotating column disposed on the inner cylinder, the rotating column being provided with an arc-shaped inclined groove, and a sleeve being provided on the rotating column, the inner side of the sleeve being provided with a protrusion, the protrusion being slidably connected to the inner side of the arc-shaped inclined groove.

[0007] Furthermore, the anti-blocking component includes a sealing plate disposed on the inner side of the inner cylinder, and a plurality of anti-blocking blocks are arranged in a circular array on the sealing plate, and the anti-blocking blocks are slidably connected to the inner side of the corresponding first discharge port.

[0008] Furthermore, the push-opening assembly includes push-opening rods respectively disposed on the two outer cylinders, the two push-opening rods being symmetrically distributed, the push-opening rods abutting against the sealing plate, and a reset spring being disposed between the anti-blocking block and the inner wall of the inner cylinder.

[0009] Furthermore, the extrusion discharge component also includes an air-push assembly disposed on the connecting pipe, a pressurization assembly disposed on the air-push assembly, a reverse thrust assembly disposed on the pressurization assembly, and a material receiving assembly disposed on the connecting pipe. The air-push assembly includes two air-push cylinders symmetrically distributed inside the connecting pipe. An inner rod is provided inside the air-push cylinder, and the inner rod is fixedly connected to the corresponding sleeve. A bend is provided on the air-push cylinder, and the end of the bend away from the air-push cylinder extends through the connecting pipe to the outside of the connecting pipe.

[0010] Furthermore, the pressurization assembly includes two pressurization cylinders symmetrically distributed on the connecting pipe. A piston plate is provided inside the pressurization cylinder, and a piston rod is provided on the piston plate. The piston rod is slidably connected to the pressurization cylinder, and the end of the bend away from the air pusher is fixedly connected to the corresponding pressurization cylinder.

[0011] Furthermore, the thrust reverser assembly includes a drive motor mounted on the connecting pipe, a double-headed cam mounted on the output shaft of the drive motor, the double-headed cam abutting against the end of the piston rod away from the piston plate, the double-headed cam being rotatably connected to the connecting pipe, and a compression spring being mounted between the piston rod and the pressure cylinder, the compression spring being sleeved on the piston rod.

[0012] Furthermore, the receiving assembly includes a receiving box disposed on the connecting pipe, a discharge pipe disposed on the receiving box, an inlet pipe disposed on the connecting pipe inside the receiving box, a U-shaped plate disposed on the inlet pipe, an L-shaped plate disposed inside the U-shaped plate via a connecting shaft, a torsion spring disposed between the U-shaped plate and the L-shaped plate, the torsion spring being sleeved on the connecting shaft, and a bottom sealing plate disposed on the L-shaped plate, the bottom sealing plate being fitted to the bottom of the inlet pipe.

[0013] The beneficial effects of this invention are: By employing a full-process extrusion cleaning method to remove components, the mixing of residual solidified material with new melt is reduced, resulting in extruded PP interlayer boards with uniform thickness and flawless surfaces, significantly improving the yield of recycled material products. This effectively solves the core problem of residual molten plastic solidifying and clogging pipes after traditional extruder shutdowns. It avoids the blockage of melt transport in subsequent production caused by cooled and solidified residual plastic, eliminating the need for disassembly and cleaning, and greatly reducing equipment maintenance costs and downtime losses.

[0014] It achieves automated cleaning and resetting, reducing the intensity of manual operation. Through the linkage of the reverse push component, the air push component and the rotating component, the machine can be stopped for cleaning without manual disassembly of the connecting pipes. The drive motor can drive each component to complete the entire process of material outlet misalignment, extrusion discharge and resetting and realignment. The bottom sealing plate of the receiving component opens and closes automatically without manual intervention to collect residual materials, which greatly improves the convenience of operation and adapts to the needs of large-scale production.

[0015] The equipment cleaning process is fast and efficient, requiring only a short time from shutdown to restart and complete reset, significantly reducing downtime and ensuring continuous operation of the production line. At the same time, the receiving component can collect and recycle the discharged residual molten PP material, avoiding raw material waste. Combined with the production base of recycled PP material, it further reduces raw material costs, aligns with the industrial development direction of resource recycling, and enhances the company's environmental benefits and market competitiveness. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2This is a three-dimensional structural diagram of the extrusion discharge component of the present invention; Figure 3 This is a schematic diagram of the internal structure of the extrusion discharge component of the present invention; Figure 4 This is an exploded structural diagram of the extrusion discharge component of the present invention; Figure 5 This is an exploded view of the rotating component of the present invention; Figure 6 This is an exploded view of the anti-blocking component and the pushing component of the present invention; Figure 7 This is a cross-sectional view of the air propulsion component of the present invention; Figure 8 This is a cross-sectional view of the pressurization component of the present invention; Figure 9 This is a schematic diagram of the reverse-engineering component structure of the present invention; Figure 10 This is a schematic diagram of the material receiving assembly structure of the present invention.

[0017] In the picture: 1. Extruder base; 11. Barrel; 12. Hopper; 13. Extrusion head; 14. Connecting pipe; 2. Extrusion discharge assembly; 21. Outer cylinder; 22. Inner cylinder; 23. First discharge port; 24. Second discharge port; 3. Rotating assembly; 31. Rotating column; 32. Arc-shaped inclined groove; 33. Sleeve; 34. Protrusion; 4. Anti-clogging assembly; 41. Sealing plate; 42. Anti-clogging block; 5. Push-open assembly; 51. Push-open rod; 52. Return spring; 6. Pneumatic push assembly; 61. Pneumatic push cylinder; 62. Inner rod; 63. Bend; 7. Pressurization assembly; 71. Pressurization cylinder; 72. Piston plate; 73. Piston rod; 8. Reverse push assembly; 81. Drive motor; 82. Double-headed cam; 83. Compression spring; 9. Material receiving assembly; 91. Material receiving box; 92. Discharge pipe; 93. Feed pipe; 94. U-shaped plate; 95. L-shaped plate; 96. Bottom sealing plate. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] Example 1, referring to Figures 1-6This is the first embodiment of the present invention, which provides an extruder for producing PP hollow board based on recycled plastic. The extruder includes an extruder base 1, a barrel 11 fixedly connected to the top of the extruder base 1, a hopper 12 fixedly connected to the top of the barrel 11, an extrusion head 13 disposed on one side of the extruder base 1, and a connecting pipe 14 fixedly connected between the barrel 11 and the extrusion head 13. It also includes an extrusion discharge component mounted on the connecting pipe 14. The extrusion discharge component includes an extrusion discharge assembly 2 installed inside the connecting pipe 14, and a rotating assembly 3, an anti-blocking assembly 4, and a pushing assembly 5 mounted on the extrusion discharge assembly 2. The extrusion discharge component is used to extrude and discharge the residual molten plastic inside the connecting pipe 14. The extrusion discharge assembly 2 includes two outer cylinders 21 symmetrically distributed and slidably connected to the inner side of the connecting pipe 14, and an inner cylinder 22 rotatably connected to the inner side of each outer cylinder 21. Several first discharge ports 23 are arranged in a ring array on the outer cylinders 21, and several second discharge ports 24 are arranged in a ring array on the inner cylinders 22.

[0020] Specifically, during normal production, workers first feed recycled PP plastic granules into hopper 12. After entering cylinder 11 from hopper 12, the granules are melted by the shearing action of the heating device and the internal screw in cylinder 11. At this time, the two outer cylinders 21 in the extrusion discharge assembly 2 are in the initial position of limiting sliding. By rotating the inner cylinder 22, the second discharge port 24 on it is fully aligned with the first discharge port 23 of the outer cylinder 21. The molten recycled PP plastic can smoothly pass through the extrusion discharge assembly 2 in the connecting pipe 14 and be smoothly injected into the extrusion head 13, and finally formed into a PP hollow plate through the extrusion head 13. When the equipment needs to be stopped, the extrusion discharge assembly starts to enter the cleaning stage. First, the two inner cylinders 22 are rotated to gradually misalign the second discharge port 24 with the first discharge port 23. The two outer cylinders 21 are then controlled to slide relative to each other along the inner side of the connecting pipe 14. The inner walls of the outer cylinders 21 exert a squeezing force on the residual molten recycled PP plastic inside the connecting pipe 14. This squeezing and discharge component extrudes and collects the molten plastic inside the connecting pipe 14, ensuring that the molten plastic adhering to the inner wall of the connecting pipe 14 is fully removed. This effectively solves the core problem of residual molten plastic solidifying and clogging the pipe after shutdown in traditional extruders. Through the mechanical squeezing and scraping action of the squeezing and discharge component 2, the residual molten recycled PP plastic inside the connecting pipe 14 can be completely discharged during shutdown, preventing the residual plastic from cooling and solidifying and obstructing melt transport for the next production run. This eliminates the need for disassembly and cleaning, significantly reducing equipment maintenance costs and downtime losses.

[0021] Reference Figure 4 and Figure 5The rotating component 3 includes a rotating column 31 fixedly connected to the inner cylinder 22. An arc-shaped inclined groove 32 is provided on the rotating column 31. A sleeve 33 is also slidably connected to the rotating column 31. A protrusion 34 is fixedly connected to the inner side of the sleeve 33. The protrusion 34 is slidably connected to the inner side of the arc-shaped inclined groove 32.

[0022] Specifically, initially, the sleeve 33 is located at the end of the rotating column 31 away from the inner cylinder 22, and the protrusion 34 is located at the end of the arc-shaped inclined groove 32 away from the inner cylinder 22. The first discharge port 23 and the second discharge port 24 coincide, allowing the molten plastic in the connecting pipe 14 to pass through normally. When the extrusion discharge assembly 2 is activated, it pushes the sleeve 33 to slide on the rotating column 31 towards the end of the inner cylinder 22, causing the protrusion 34 to slide inside the arc-shaped inclined groove 32. Under the action of the arc-shaped inclined groove 32, the rotating column 31 rotates in the forward direction, driving the inner cylinder 22 to rotate, causing the first discharge port 23 and the second discharge port 24 to be misaligned. This ensures that when the two outer cylinders 21 slide relative to each other to extrude the molten plastic in the connecting pipe 14, the molten plastic will not flow out between the first discharge port 23 and the second discharge port 24. When the two outer cylinders 21 come into contact, i.e. The molten plastic in the connecting pipe 14 is squeezed out, and the two outer cylinders 21 need to be reset to their original positions. The sleeve 33 slides on the rotating column 31 away from the inner cylinder 22, so that the protrusion 34 slides on the inner side of the arc-shaped groove 32 away from the inner cylinder 22. Under the action of the arc-shaped groove 32, the rotating column 31 is reversed, which drives the inner cylinder 22 to rotate, so that the first discharge port 23 and the second discharge port 24 coincide. This ensures that when the two outer cylinders 21 slide in opposite directions, no negative pressure is formed between the two outer cylinders 21 and the connecting pipe 14, which would prevent the two outer cylinders 21 from resetting.

[0023] Reference Figure 6 The anti-blocking component 4 includes a sealing plate 41 that is slidably connected to the inner side of the inner cylinder 22. Several anti-blocking blocks 42 are slidably connected to the sealing plate 41 in a ring array. The anti-blocking blocks 42 are slidably connected to the inner side of the corresponding first discharge port 23.

[0024] Specifically, when the inner cylinder 22 rotates, it drives the sealing plate 41 to rotate, causing the anti-blocking block 42 to rotate to the corresponding first discharge port 23 position. The sealing plate 41 and the inner cylinder 22 are connected by a sealing limit sliding connection, and the anti-blocking block 42 and the sealing plate 41 are connected by a sealing sliding connection. Therefore, when the sealing plate 41 slides towards the inner side of the inner cylinder 22, the volume of the cavity formed between the inner cylinder 22 and the sealing plate 41 will decrease, and the gas pressure will increase, pushing the anti-blocking block 42 towards the outer side of the sealing plate 41, so that the anti-blocking block 42 is inserted into the inner side of the corresponding first discharge port 23. When the two outer cylinders 21 slide relative to each other, the first discharge port 23 is blocked, so that the opposite sides of the two outer cylinders 21 form a plane, avoiding the residue of molten plastic inside the first discharge port 23, which would cause the first discharge port 23 to be blocked.

[0025] Reference Figure 6 The push-opening component 5 includes push-opening rods 51 that are respectively limited and slidably connected to the two outer cylinders 21. The two push-opening rods 51 are symmetrically distributed. The push-opening rods 51 abut against the sealing plate 41. A return spring 52 is fixedly connected between the anti-blocking block 42 and the inner wall of the inner cylinder 22.

[0026] Specifically, when the two outer cylinders 21 slide relative to each other and approach each other, the push rod 51 will abut against the opposite outer cylinder 21, causing the push rod 51 to retract inward to the inner side of the outer cylinder 21, pushing the sealing plate 41, causing the anti-blocking block 42 to be squeezed out, and the return spring 52 to stretch. When the two outer cylinders 21 slide away from each other, the push rod 51 will no longer be pushed by the outer cylinder 21, the return spring 52 will reset, the anti-blocking block 42 will return to its original position, push the sealing plate 41 to reset, and cause the push rod 51 to extend again.

[0027] Example 2, refer to Figure 7 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the extrusion discharge component further includes an air-push assembly 6 installed on the connecting pipe 14. A pressurizing assembly 7 is installed on the air-push assembly 6, and a reverse thrust assembly 8 is installed on the pressurizing assembly 7. A receiving assembly 9 is also installed on the connecting pipe 14. The air-push assembly 6 includes two air-push cylinders 61 symmetrically distributed inside the connecting pipe 14. An inner rod 62 is slidably connected to the inner side of the air-push cylinder 61. The inner rod 62 is fixedly connected to the corresponding sleeve 33. A bent pipe 63 is fixedly connected to the air-push cylinder 61. The end of the bent pipe 63 away from the air-push cylinder 61 extends through the connecting pipe 14 to the outside of the connecting pipe 14.

[0028] Specifically, the gas inside the bend 63 is forced into the pneumatic cylinder 61. The inner rod 62, which is sealed and sliding inside the pneumatic cylinder 61, will extend out of the pneumatic cylinder 61 under the pressure of the gas, pushing the sleeve 33 to move. The gas inside the bend 63 is no longer compressed, allowing the gas inside the pneumatic cylinder 61 to enter the bend 63, and the inner rod 62 will retract into the pneumatic cylinder 61 to reset.

[0029] Reference Figure 8 The pressurizing assembly 7 includes two pressurizing cylinders 71 that are symmetrically distributed and fixedly connected to the connecting pipe 14. A piston plate 72 is slidably connected to the inner side of the pressurizing cylinder 71. A piston rod 73 is fixedly connected to the piston plate 72. The piston rod 73 is slidably connected to the pressurizing cylinder 71. The end of the bend 63 away from the air pusher 61 is fixedly connected to the corresponding pressurizing cylinder 71.

[0030] Specifically, when the piston rod 73 slides inward toward the pressure cylinder 71, it drives the piston plate 72 to slide inward toward the pressure cylinder 71, compressing the gas inside the pressure cylinder 71 and causing the gas inside the pressure cylinder 71 to enter the bend 63. When the piston rod 73 slides outward toward the pressure cylinder 71, the piston plate 72 slides outward toward the pressure cylinder 71, drawing the gas in the bend 63 back into the pressure cylinder 71. The remaining structure is the same as in Embodiment 1.

[0031] Example 3, referring to Figure 9 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the reverse thrust assembly 8 includes a drive motor 81 fixedly connected to the connecting pipe 14. A double-headed cam 82 is fixedly connected to the output shaft of the drive motor 81. The double-headed cam 82 abuts against the end of the piston rod 73 away from the piston plate 72. The double-headed cam 82 is rotatably connected to the connecting pipe 14. A compression spring 83 is fixedly connected between the piston rod 73 and the pressure cylinder 71. The compression spring 83 is sleeved on the piston rod 73.

[0032] Specifically, the drive motor 81 is started, which drives the double-headed cam 82 to rotate. The convex end of the double-headed cam 82 presses against the piston rod 73, causing the compression spring 83 to contract. When the convex end of the double-headed cam 82 moves away from the piston rod 73, the compression spring 83 will return to its original position, which will drive the piston rod 73 to return to its original position.

[0033] Reference Figure 2 , Figure 3 and Figure 10 The receiving assembly 9 includes a receiving box 91 fixedly connected to the connecting pipe 14, a discharge pipe 92 fixedly connected to the receiving box 91, an inlet pipe 93 fixedly connected to the connecting pipe 14 inside the receiving box 91, a U-shaped plate 94 fixedly connected to the inlet pipe 93, an L-shaped plate 95 rotatably connected to the inside of the U-shaped plate 94 via a connecting shaft, a torsion spring fixedly connected between the U-shaped plate 94 and the L-shaped plate 95, the torsion spring being sleeved on the connecting shaft, and a bottom sealing plate 96 fixedly connected to the L-shaped plate 95, the bottom sealing plate 96 being in contact with the bottom of the inlet pipe 93.

[0034] Specifically, initially, the bottom sealing plate 96 is attached to the bottom of the feed pipe 93 under the action of the torsion spring, ensuring that the molten plastic conveyed in the connecting pipe 14 does not fall from the feed pipe 93 into the receiving box 91. When the molten plastic in the connecting pipe 14 is squeezed by the two outer cylinders 21, the volume of the movable cavity formed by the two outer cylinders 21 and the connecting pipe 14 decreases, and the pressure in the movable cavity increases, which will squeeze the bottom sealing plate 96 downward, causing the bottom sealing plate 96 to rotate downward against the torsion force of the torsion spring, opening the bottom of the feed pipe 93, so that the molten plastic squeezed in the connecting pipe 14 enters the receiving box 91 from the feed pipe 93. When the two outer cylinders 21 are completely attached together, the volume of the movable cavity returns to zero, and the bottom sealing plate 96 is no longer squeezed. Under the action of the torsion spring reset, the bottom sealing plate 96 rotates upward, re-sealing the bottom of the feed pipe 93. The rest of the structure is the same as that in Embodiment 2.

[0035] Based on embodiments 1-3, the working principle of the present invention is as follows: During normal production, recycled PP granules enter the feed cylinder 11 through the hopper 12 and are melted into a melt by the heating device and the shearing action of the internal screw in the feed cylinder 11. At this time, the sleeve 33 in the rotating assembly 3 is located at the end of the rotating column 31 away from the inner cylinder 22, and the protrusion 34 is located at the far end of the arc-shaped inclined groove 32. The first discharge port 23 of the outer cylinder 21 of the extrusion discharge assembly 2 completely overlaps with the second discharge port 24 of the inner cylinder 22, and the melt can smoothly pass through the connecting pipe 14 and be injected into the extrusion head 13 for forming. The bottom sealing plate 96 of the receiving assembly 9 adheres to the bottom of the feed pipe 93 under the action of the torsion spring, preventing the melt from falling into the receiving box 91. During shutdown and cleaning, the reverse push assembly 8 drives the motor 81 to drive the double-headed cam 82 to rotate, compressing the compression spring 83 by squeezing the piston rod 73, so that the gas in the pressure cylinder 71 is sent into the air push cylinder 61 through the bend pipe 63, pushing the inner rod 62 to drive the sleeve 33 to slide along the rotating column 31 towards the inner cylinder 22. The protrusion 34 slides within the arc-shaped inclined groove 32, causing the rotating column 31 to drive the inner cylinder 22 to rotate, thus misaligning the first discharge port 23 and the second discharge port 24. Simultaneously, the outer cylinder 21 slides relative to the connecting pipe 14, compressing the residual melt. The push rod 51 of the push-open component 5 is compressed and retracts inward, pushing the sealing plate 41, causing the anti-blocking block 42 to insert into the first discharge port 23, preventing melt residue from remaining in the first discharge port 23. The pressure generated by the melt compression within the connecting pipe 14 overcomes the torsion spring's torque, pushing open the bottom sealing plate 96 and entering the receiving box 91 through the feed pipe 93 for collection. After cleaning, the protruding end of the double-headed cam 82 moves away from the piston rod 73, the compression spring 83 resets and drives the piston rod 73 to retract, the gas in the air-push cylinder 61 flows back, the sleeve 33 resets and causes the rotating column 31 to reverse, the outlets of the inner cylinder 22 and the outer cylinder 21 coincide; the outer cylinder 21 slides in opposite directions, the reset spring 52 pulls the anti-blocking block 42 to reset, the sealing plate 41 pushes the push rod 51 to extend, and the bottom sealing plate 96 closes the feed pipe 93 under the action of the torsion spring.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A kind of production extruder of PP hollow lattice board based on recycled plastic regeneration, including extruder base (1), the top of extruder base (1) is provided with barrel (11), the top of barrel (11) is provided with hopper (12), one side of extruder base (1) is provided with extrusion head (13), connecting pipe (14) is provided between barrel (11) and extrusion head (13), it is characterized by: The extrusion discharge part is arranged on the connecting pipe (14); The extrusion discharge part comprises an extrusion discharge assembly (2) arranged in the connecting pipe (14), and the extrusion discharge assembly (2) is provided with a rotating assembly (3), a anti-blocking assembly (4) and a pushing assembly (5); The extrusion discharge part is used for extruding and discharging the residual molten plastic in the connecting pipe (14); The extrusion discharge assembly (2) comprises two outer cylinders (21) symmetrically arranged on the inner side of the connecting pipe (14), and the inner sides of the two outer cylinders (21) are provided with inner cylinders (22); a plurality of first discharge ports (23) are arranged in an annular array on the outer cylinder (21); and a plurality of second discharge ports (24) are arranged in an annular array on the inner cylinder (22).

2. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 1, characterized in that: The rotating assembly (3) comprises a rotating column (31) arranged on the inner cylinder (22), and the rotating column (31) is provided with an arc-shaped chute (32) and a sleeve (33); the inner side of the sleeve (33) is provided with a protrusion (34) which is in sliding connection with the inner side of the arc-shaped chute (32).

3. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 1, characterized in that: The anti-blocking assembly (4) comprises a sealing plate (41) arranged on the inner side of the inner cylinder (22), and a plurality of anti-blocking blocks (42) are arranged in an annular array on the sealing plate (41); the anti-blocking blocks (42) are in sliding connection with the inner sides of the corresponding first discharge ports (23).

4. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 3, characterized in that: The pushing assembly (5) comprises two pushing rods (51) respectively arranged on the two outer cylinders (21), and the two pushing rods (51) are symmetrically arranged; the pushing rod (51) is in abutment with the sealing plate (41); and the anti-blocking block (42) and the inner wall of the inner cylinder (22) are provided with a return spring (52).

5. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 2, characterized in that: The extrusion discharge part further comprises a gas pushing assembly (6) arranged on the connecting pipe (14), and the gas pushing assembly (6) is provided with a pressurizing assembly (7) and a reverse pushing assembly (8); and the connecting pipe (14) is further provided with a material receiving assembly (9). The gas pushing assembly (6) comprises two gas pushing cylinders (61) symmetrically arranged in the connecting pipe (14), and the inner side of the gas pushing cylinder (61) is provided with an inner rod (62) which is fixedly connected with the corresponding sleeve (33); the gas pushing cylinder (61) is provided with a bent pipe (63) which extends to the outer side of the connecting pipe (14) through the connecting pipe (14) at the end away from the gas pushing cylinder (61).

6. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 5, characterized in that: The pressurizing assembly (7) comprises two pressurizing cylinders (71) symmetrically arranged on the connecting pipe (14), and the inner side of the pressurizing cylinder (71) is provided with a piston plate (72) which is provided with a piston rod (73) in sliding connection with the pressurizing cylinder (71); and the end of the bent pipe (63) away from the gas pushing cylinder (61) is fixedly connected with the corresponding pressurizing cylinder (71).

7. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 6, characterized in that: The reverse pushing assembly (8) comprises a driving motor (81) arranged on the connecting pipe (14), a double-end cam (82) is arranged on the output shaft of the driving motor (81), the double-end cam (82) is in abutment with the end of the piston rod (73) away from the piston plate (72), the double-end cam (82) is rotatably connected with the connecting pipe (14), and the extrusion spring (83) is arranged between the piston rod (73) and the pressurizing cylinder (71) and is sleeved on the piston rod (73).

8. The extruder for producing recycled plastic-based PP hollow lattice plate according to claim 5, characterized in that: The material receiving assembly (9) comprises a material receiving box (91) arranged on the connecting pipe (14), a discharging pipe (92) is arranged on the material receiving box (91), a feeding pipe (93) is arranged on the connecting pipe (14) and located on the inner side of the material receiving box (91), a U-shaped plate (94) is arranged on the feeding pipe (93), an L-shaped plate (95) is arranged on the inner side of the U-shaped plate (94) through a connecting shaft, a torsional spring is arranged between the U-shaped plate (94) and the L-shaped plate (95) and is sleeved on the connecting shaft, a bottom sealing plate (96) is arranged on the L-shaped plate (95), and the bottom sealing plate (96) is attached to the bottom of the feeding pipe (93).

Images