Plastic extruder

Abstract

The utility model discloses a plastic extruder, the side surface of the extruder is provided with an extrusion port, the upper surface of one end of the extruder is fixedly provided with a cooling box, the interior of the cooling box is fixedly provided with a heat exchange tube, and the side surface of the cooling box is connected with one end of a water return tube and one end of a water outlet tube. The cooling forming mechanism comprises a cooling water tank formed in one end of the cooling water tank, a motor fixedly installed on the outer side surface of one end of the extruder and a transmission wheel rotationally connected to the inner side surface of the cooling water tank. According to the plastic extruder, water sprayed out of the water spraying holes is pushed by water flow to move upwards when strip-shaped materials are about to make contact with the water spraying holes in the mode that the rotating rod continuously sprays water outwards through the water spraying holes in the rotating process, and the materials are prevented from making contact with the rotating rod as much as possible through supporting of the water flow; and the possibility that the extruder cannot work normally due to adhesion of the material and the rotating rod is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic processing, in particular to a plastic extruder. Background Art

[0002] Cooling is an important measure to ensure the geometric shape and internal structure of plastic products. The plastic extruded layer should be cooled immediately after leaving the machine head, otherwise it will be deformed under the action of gravity. For non-crystalline materials such as polyvinyl chloride, the problem of crystallization can be ignored. Plastic products can be cooled by rapid cooling method, directly cooled with water, so that they are cooled thoroughly in the cooling water tank and no longer deformed. For the cooling of crystalline polymers such as polyethylene and polypropylene, the crystallization problem should be considered. If the rapid cooling method is used, it will have an adverse effect on the organization of the plastic product and produce internal stress, which is one of the reasons for the cracking of the material in the future. It must be taken seriously in the extrusion process. Therefore, the extruded layer of crystalline plastics such as polyethylene and polypropylene should be cooled by warm water. In the cooling water tank, the plastic, During the cooling process of plastics and crystalline polymers, rollers are usually used to support and convey the strip materials immersed in water to prevent the soft materials just extruded from deformation under the pull of gravity. However, if the material is not cooled and hardened in time due to the influence of water temperature during the conveying process, the possibility of the material sticking to the conveyor roller will increase, causing the subsequent material to continuously wrap around the surface of the conveyor roller after being sent out, seriously threatening the normal operation of the extruder. At the same time, when the material enters the cooling water tank, the surface of the cooling chamber is suddenly cooled and a certain amount of crystals will precipitate. These crystals floating in the water will gradually adhere to the surface of the subsequent extruded material, resulting in a large number of point-like protrusions on the surface of the subsequent extruded material, affecting the surface smoothness and appearance of the material. Utility Model Content

[0003] The purpose of the present invention is to provide a plastic extruder to solve the problems raised in the above background technology, that is, the material sticks to the conveying roller and impurities adhere to the surface of the material and affect the quality of the material.

[0004] To achieve the above object, the present invention provides the following technical solution: a plastic extruder, wherein an extrusion port is provided on a side surface of the extruder, a cooling box is fixedly provided on an upper surface of one end of the extruder, and a heat exchange tube is fixedly installed inside the cooling box, and a return pipe and one end of a water outlet pipe are connected to the side surface of the cooling box;

[0005] A cooling and molding mechanism is provided inside one end of the extruder and is used to cool and mold the plastic strip extruded from the extrusion port;

[0006] The cooling and molding mechanism includes: a cooling water tank provided inside the extruder, a motor fixedly mounted on the outer surface of one end of the extruder, a transmission wheel rotatably connected to the inner surface of the cooling water tank, a connecting pipe fixedly mounted on the side surface of one end of the extruder, a rotating rod rotatably connected to the inner surface of the cooling water tank, a water spray hole provided on the outer surface of the rotating rod, and a water purification filter fixedly mounted on the outer surface of one end of the extruder;

[0007] An impurity removal and filtering mechanism is provided inside the lower surface of the extruder below the cooling water tank, and is used to remove impurities from the cooling water inside the cooling water tank;

[0008] The impurity removal and filtering mechanism includes: an impurity removal chamber provided inside the lower surface of the extruder, a roller installed on the inner surface of the cooling water tank, a material storage tank provided on the outer surface of the roller, a filter screen fixedly provided inside the impurity removal chamber, a push rod slidably connected to the impurity removal chamber, a scraper fixedly connected to the side surface of the push rod, and a water pump fixedly installed on the outer surface of the lower end of the extruder;

[0009] A water level monitoring mechanism is provided on the inner surface of the cooling water tank and is used to monitor the water level inside the cooling water tank;

[0010] The water level monitoring mechanism includes: a push switch fixedly installed on the inside of the side surface of the cooling water trough, a push block slidably connected to the side surface of the cooling water trough, a mounting block fixedly arranged on the bottom surface of the inside of the cooling water trough, a trigger rod passing through the outer surface of the mounting block, a buoyancy plate slidably connected to the inner surface of the cooling water trough, a rotating plate rotatably connected to the lower end surface of the buoyancy plate, and a warning light fixedly installed on the outer surface of the extruder.

[0011] Preferably, the output shaft of the motor passes through the inner surface of the cooling water tank and is fixedly connected to the rotating shaft of a transmission wheel, and the outer surface of the transmission wheel is in contact with the outer surface of the rotating rod.

[0012] Preferably, one end of the connecting pipe passes through the inner surface of the cooling water tank, and the end of the connecting pipe passing through the inner surface of the cooling water tank is rotatably connected to the rotating rod, and the connecting pipe and the rotating rod are connected.

[0013] Preferably, the water spray holes are evenly distributed on the outer surface of the rotating rod, and the rotating rod is hollow in design, and the rotating rod facing the water purification filter element is connected to the water outlet end of the water purification filter element.

[0014] Preferably, the heat exchange tube is a continuous S-shaped design, and both ends of the heat exchange tube pass through the side surface of the cooling box, and the two ends of the heat exchange tube are respectively connected to the return pipe and the outlet pipe, one end of the return pipe is connected to the water inlet hole of the water purification filter element, and one end of the outlet pipe is connected to the water outlet of the water pump.

[0015] Preferably, the upper surface of the impurity removal chamber is penetrated by a roller, and the outer surface of the roller is in contact with the outer surface of the transmission wheel.

[0016] Preferably, the upper end of the push rod is an isosceles trapezoidal structure, and the upper end of the push rod is in contact with the outer surface of the drum, and a spring is connected between the push rod and the debris removal chamber.

[0017] Preferably, the side surface of the scraper fits the outer surface of the filter screen, and the scraper is located on the side of the filter screen away from the water pump, and the scraper is designed as a right triangle, and the water inlet of the water pump passes through the inner surface of the impurity removal cavity.

[0018] Preferably, a spring is connected between the pressing block and the extruder, and the pressing block and the trigger rod are at the same horizontal height, and the pressing block is arranged opposite to the trigger rod.

[0019] Preferably, a spring is connected between the trigger rod and the mounting block, and the end of the trigger rod facing the roller is designed as an isosceles trapezoid, and the end of the trigger rod with the isosceles trapezoid design is connected to the roller through a material storage trough.

[0020] Preferably, the buoyancy plate and the rotating plate are both located directly above the gap between the pressing block and the trigger rod, and the lower end of the rotating plate is designed as an isosceles trapezoid, and the end of the rotating plate with a smaller width is arranged downward.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the plastic extruder:

[0022] 1. The rotating rod continuously sprays water outward through the water spray hole during the rotation process, so that the water sprayed from the water spray hole is pushed upward by the water flow when the strip material is about to contact the water spray hole. The water flow is used to support the material to avoid contact with the rotating rod as much as possible, reducing the possibility of the material and the rotating rod sticking to each other and causing the extruder to malfunction;

[0023] 2. During the rotation of the drum, the impurities floating in the cooling water tank are continuously brought into the impurity removal chamber through the storage tank. The water exchange is carried out by overlapping the storage tank cavity with the impurity removal chamber cavity. This reduces the disturbance of the water flow in the cooling water tank when the water pump is pumping water, so that the materials in the cooling water tank will not be pulled downward by the flowing water and cause deformation of the materials.

[0024] 3. The water level inside the cooling water tank is monitored by continuously squeezing the trigger rod during the rotation of one side of the roller. Once the water level falls below the preset value, the trigger rod squeezes one end of the rotating plate that slides down with the water level. The rotating plate pushes the pressing block to slide and squeeze the press switch to trigger the warning light, automatically alerting staff when the water level is too low.

[0025] 4. The large particles of impurities are filtered on the surface of the filter screen. At the same time, the storage tank alternately squeezes the top rod during the rotation of the drum, so that the top rod slides up and down and drives the scraper to scrape the impurities on the surface of the filter screen to prevent the filter screen from being blocked and causing water to be unable to flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the connection between the extruder and the connecting pipe of the utility model;

[0028] Figure 3 This is a schematic diagram of the three-dimensional structure of the connection between the extruder and the transmission wheel of the utility model;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the connection between the extruder and the rotating rod of the utility model;

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the connection between the cooling box and the heat exchange tube of the utility model;

[0031] Figure 6 This is a schematic diagram of the overall front cross-sectional structure of the utility model;

[0032] Figure 7 This is a schematic side view of the overall structure of the utility model;

[0033] Figure 8 For this utility model Figure 6 Enlarged structural diagram at point A in the middle.

[0034] In the figure: 1. Extruder; 2. Extrusion port;

[0035] Cooling and molding mechanism: 31, cooling water tank; 32, motor; 33, transmission wheel; 34, connecting pipe; 35, rotating rod; 36, water spray hole; 37, water purification filter element;

[0036] 4. Cooling box; 5. Heat exchange tube; 6. Return pipe; 7. Outlet pipe;

[0037] Impurity removal and filtering mechanism: 81, impurity removal chamber; 82, roller; 83, storage trough; 84, filter screen; 85, ejector rod; 86, scraper; 87, water pump;

[0038] Water level monitoring: 91. Push switch; 92. Press block; 93. Mounting block; 94. Trigger rod; 95. Buoyancy plate; 96. Rotating plate; 97. Warning light. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] An embodiment of the present application provides a plastic extruder, which supports the material from below by means of water flow after the material is extruded, thereby reducing the possibility of the material sticking to the conveying roller, and reduces the possibility of impurities adhering to the surface of the material by removing impurities in the cooling water tank 31.

[0041] The plastic extruder is described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0042] The present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] See also Figure 1-8 In the embodiment, a plastic extruder is provided, wherein an extrusion port 2 is provided on the side surface of the extruder 1, a cooling box 4 is fixedly provided on the upper surface of one end of the extruder 1, and a heat exchange tube 5 is fixedly installed inside the cooling box 4, and one end of a return pipe 6 and a water outlet pipe 7 are connected to the side surface of the cooling box 4;

[0044] In this embodiment, the plastic extruder mainly includes an extruder 1, an extrusion port 2, a cooling and molding mechanism, a cooling box 4, a heat exchange pipe 5, a return pipe 6, a water outlet pipe 7, a debris removal and filtering mechanism, and a water level monitoring mechanism. The plastic extruder provided by this solution reduces the possibility of adhesion between the conveying roller and the material through the cooling and molding mechanism, and cooperates with the debris removal and filtering mechanism to remove impurities, so that the material can maintain a good shape and surface finish after extrusion and cooling. During the cooling process, the water level is detected in real time by the water level monitoring mechanism, and the warning light 97 is triggered in time to remind the staff when the water level is low.

[0045] In some embodiments, the cooling and molding mechanism includes: a cooling water trough provided inside the extruder 1, a motor 32 fixedly mounted on the outer surface of one end of the extruder 1, a transmission wheel 33 rotatably connected to the inner surface of the cooling water trough 31, a connecting pipe 34 fixedly mounted on the side surface of one end of the extruder 1, a rotating rod 35 rotatably connected to the inner surface of the cooling water trough 31, a water spray hole 36 provided on the outer surface of the rotating rod 35, and a water purification filter element 37 fixedly mounted on the outer surface of one end of the extruder 1. When the extruder 1 extrude the material into the cooling water trough 31 through the extrusion port 2, the motor 32 drives the transmission wheel 33 to rotate, and the transmission wheel 33 drives the rotating rod 35 to rotate by fitting with the rotating rod 35. At the same time, the connecting pipe 34 injects water purified by the water purification filter element 37 into the interior of the rotating rod 35 and sprays it out through the water spray hole 36, so that the material is laterally pulled out of the extruder 1 by the external winding equipment under the support of the water column.

[0046] In some embodiments, the impurity removal and filtering mechanism includes: a impurity removal chamber 81 provided inside the lower surface of the extruder 1, a roller 82 installed on the inner surface of the cooling water tank 31, a material storage tank 83 provided on the outer surface of the roller 82, a filter screen 84 fixedly provided inside the impurity removal chamber 81, a push rod 85 slidably connected to the inside of the impurity removal chamber 81, a scraper 86 fixedly connected to the side surface of the push rod 85, and a water pump 87 fixedly installed on the outer surface of the lower end of the extruder 1. The water pump 87 pumps water out of the impurity removal chamber 81, and impurities in the water in the impurity removal chamber 81 are filtered by the filter screen 84. The roller 82 driven to rotate by the transmission wheel 33 alternately engages and disengages with the push rod 85 through the material storage tank 83 to squeeze the inclined surface of the push rod 85 during rotation, so that the push rod 85 can slide up and down to drive the scraper 86 to scrape off impurities accumulated on the side surface of the filter screen 84, thereby reducing the possibility of the filter screen 84 being completely blocked by impurities.

[0047] In some embodiments, the water level monitoring mechanism includes: a push switch 91 fixedly mounted on the inner side surface of the cooling water tank 31, a push block 92 slidably connected to the side surface of the cooling water tank 31, a mounting block 93 fixedly set on the bottom surface of the inner side of the cooling water tank 31, a trigger rod 94 passing through the outer surface of the mounting block 93, a buoyancy plate 95 slidably connected to the inner side surface of the cooling water tank 31, a rotating plate 96 rotatably connected to the lower end surface of the buoyancy plate 95, and a warning light 97 fixedly mounted on the outer surface of the extruder 1. When the water level inside the cooling water tank 31 is too low, the buoyancy is insufficient to support the buoyancy plate 95 to drive the rotating plate 96 to float up. At this time, the rotating plate 96 slides between the trigger rod 94 and the push block 92 under the action of gravity. When the drum 82 rotates and causes the trigger rod 94 to be squeezed by the storage trough 83 and slide relative to the mounting block 93, the trigger rod 94 squeezes the rotating plate 96, causing the rotating plate 96 to rotate and push the push block 92 to slide. The push switch 91 is triggered by the push block 92 to start the warning light 97 to remind the staff.

[0048] In some embodiments, the output shaft of the motor 32 passes through the inner surface of the cooling water trough 31 and is fixedly connected to the rotating shaft of a transmission wheel 33, and the outer surface of the transmission wheel 33 fits the outer surface of the rotating rod 35, so that the transmission wheel 33 can drive all the rotating rods 35 to rotate in the same direction through contact with the outer surface of the rotating rod 35, so as to achieve the purpose of driving the material to produce lateral displacement by spraying water to reduce the pulling force and prevent sticking.

[0049] In some embodiments, one end of the connecting pipe 34 passes through the inner surface of the cooling water trough 31, and the end of the connecting pipe 34 passing through the inner surface of the cooling water trough 31 is rotatably connected to the rotating rod 35, and the connecting pipe 34 and the rotating rod 35 are connected, so that the connecting pipe 34 can supply water to the rotating rod 35 connected to the water purification filter element 37 on one side, ensuring that all rotating rods 35 discharge water evenly.

[0050] In some embodiments, the water spray holes 36 are evenly distributed on the outer surface of the rotating rod 35, and the rotating rod 35 is hollow in design. The rotating rod 35 facing the water purification filter element 37 is connected to the water outlet end of the water purification filter element 37, so that the rotating rod 35 can spray water outward through the water spray holes 36 to provide upward supporting force for the material, thereby reducing the possibility of the material sticking to the rotating rod 35.

[0051] In some embodiments, the heat exchange tube 5 is a continuous S-shaped design, and both ends of the heat exchange tube 5 pass through the side surface of the cooling box 4, and the two ends of the heat exchange tube 5 are respectively connected to the return pipe 6 and the outlet pipe 7, one end of the return pipe 6 is connected to the water inlet of the water purification filter element 37, and one end of the outlet pipe 7 is connected to the water outlet of the water pump 87, so that the heat exchange tube 5 can receive the water injected by the water pump 87 through the outlet pipe 7 to condense the steam floating into the cooling box 4, so that the condensed water falls back into the cooling water tank 31, reducing the water consumption rate inside the cooling water tank 31, and the water after heat exchange is injected into the water purification filter element 37 through the return pipe 6 to filter out fine impurities.

[0052] In some embodiments, the upper surface of the impurity removal chamber 81 is penetrated by the roller 82, and the outer surface of the roller 82 is in contact with the outer surface of the transmission wheel 33, so that the transmission wheel 33 can drive the roller 82 to rotate and discharge water containing impurities.

[0053] In some embodiments, the upper end of the push rod 85 is an isosceles trapezoidal structure, and the upper end of the push rod 85 is in contact with the outer surface of the drum 82, and a spring is connected between the push rod 85 and the debris removal chamber 81, so that the push rod 85 can slide back and forth up and down during the rotation of the drum 82 through the pressure of the inclined surface and the support of the spring.

[0054] In some embodiments, the side surface of the scraper 86 is in contact with the outer surface of the filter 84, and the scraper 86 is located on the side of the filter 84 away from the water pump 87, and the scraper 86 is designed as a right triangle. The water inlet of the water pump 87 passes through the inner surface of the impurity removal chamber 81, so that the top rod 85 can drive the scraper 86 to scrape off impurities accumulated on the outer surface of the filter 84 during the up and down reciprocating sliding process, thereby preventing the filter 84 from being always blocked by impurities and causing water to be unable to flow.

[0055] In some embodiments, a spring is connected between the pressing block 92 and the extruder 1, and the pressing block 92 and the trigger rod 94 are at the same horizontal height, and the pressing block 92 is arranged opposite the trigger rod 94, so that the trigger rod 94 can slide opposite the pressing block 92 and push the pressing block 92 with the help of the rotating plate 96 after the buoyancy plate 95 and the rotating plate 96 slide down.

[0056] In some embodiments, a spring is connected between the trigger rod 94 and the mounting block 93, and the end of the trigger rod 94 facing the roller 82 is designed as an isosceles trapezoid, and the end of the isosceles trapezoid of the trigger rod 94 is engaged with the roller 82 through the storage trough 83, so that the trigger rod 94 can slide when squeezed by the storage trough 83.

[0057] In some embodiments, the buoyancy plate 95 and the rotating plate 96 are both located directly above the gap between the pressing block 92 and the trigger rod 94, and the lower end of the rotating plate 96 is designed as an isosceles trapezoid, and the end of the rotating plate 96 with a smaller width is set downward, so that when the lower end of the rotating plate 96 moves between the pressing block 92 and the trigger rod 94, even if the trigger rod 94 happens to slide, it will not be stuck.

[0058] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic extruder, wherein the side surface of the extruder (1) is provided with an extrusion port (2), a cooling box (4) is fixedly provided on the upper surface of one end of the extruder (1), and a heat exchange tube (5) is fixedly installed inside the cooling box (4), and the side surface of the cooling box (4) is connected to one end of a return pipe (6) and a water outlet pipe (7); Its characteristics are: Also includes, A cooling and molding mechanism, the cooling and molding mechanism being arranged inside one end of the extruder (1) and being used for cooling and molding the plastic strip extruded from the extrusion port (2); The cooling molding mechanism includes: a cooling water trough (31) provided inside the extruder (1), a motor (32) fixedly mounted on the outer surface of one end of the extruder (1), a transmission wheel (33) rotatably connected to the inner surface of the cooling water trough (31), a connecting pipe (34) fixedly mounted on the side surface of one end of the extruder (1), a rotating rod (35) rotatably connected to the inner surface of the cooling water trough (31), a water spray hole (36) provided on the outer surface of the rotating rod (35), and a water purification filter element (37) fixedly mounted on the outer surface of one end of the extruder (1); An impurity removal and filtering mechanism, the impurity removal and filtering mechanism being arranged inside the lower surface of the extruder (1) below the cooling water tank (31) and being used to remove impurities from the cooling water inside the cooling water tank (31); The impurity removal and filtering mechanism comprises: an impurity removal chamber (81) provided inside the lower surface of the extruder (1), a roller (82) installed on the inner surface of the cooling water tank (31), a material storage tank (83) provided on the outer surface of the roller (82), and a water pump (87) fixedly installed on the outer surface of the lower end of the extruder (1), wherein the water inlet of the water pump (87) passes through the inner surface of the impurity removal chamber (81); A water level monitoring mechanism, the water level monitoring mechanism being arranged on the inner surface of the cooling water tank (31) and being used to monitor the water level inside the cooling water tank (31); The water level monitoring mechanism includes: a push switch (91) fixedly mounted on the inner side surface of the cooling water trough (31), a push block (92) slidably connected to the side surface of the cooling water trough (31), a mounting block (93) fixedly arranged on the inner bottom surface of the cooling water trough (31), a trigger rod (94) passing through the outer surface of the mounting block (93), a buoyancy plate (95) slidably connected to the inner side surface of the cooling water trough (31), a rotating plate (96) rotatably connected to the lower end surface of the buoyancy plate (95), and a warning light (97) fixedly mounted on the outer surface of the extruder (1).

2. A plastic extruder according to claim 1, characterized in that: The output shaft of the motor (32) passes through the inner surface of the cooling water tank (31) and is fixedly connected to the rotating shaft of a transmission wheel (33), and the outer surface of the transmission wheel (33) is in contact with the outer surface of the rotating rod (35).

3. A plastic extruder according to claim 1, characterized in that: One end of the connecting pipe (34) passes through the inner surface of the cooling water tank (31), and the end of the connecting pipe (34) passing through the inner surface of the cooling water tank (31) is rotatably connected to the rotating rod (35), and the connecting pipe (34) and the rotating rod (35) are connected. The water spray holes (36) are evenly distributed on the outer surface of the rotating rod (35), and the rotating rod (35) is hollow in design. The rotating rod (35) facing the water purification filter element (37) is connected to the water outlet end of the water purification filter element (37).

4. A plastic extruder according to claim 1, characterized in that: The heat exchange tube (5) is of a continuous S-shaped design, and both ends of the heat exchange tube (5) pass through the side surface of the cooling box (4), and the two ends of the heat exchange tube (5) are respectively connected to the return pipe (6) and the outlet pipe (7), one end of the return pipe (6) is connected to the water inlet hole of the water purification filter element (37), and one end of the outlet pipe (7) is connected to the water outlet of the water pump (87).

5. A plastic extruder according to claim 1, characterized in that: The upper surface of the impurity removal chamber (81) is penetrated by the roller (82), and the outer surface of the roller (82) is in contact with the outer surface of the transmission wheel (33).

6. A plastic extruder according to claim 1, characterized in that: The impurity removal and filtering mechanism further comprises: a filter screen (84) fixedly arranged inside the impurity removal chamber (81), a top rod (85) slidably connected to the inside of the impurity removal chamber (81), and a scraper (86) fixedly connected to the side surface of the top rod (85).

7. A plastic extruder according to claim 6, characterized in that: The upper end of the push rod (85) is an isosceles trapezoidal structure, and the upper end of the push rod (85) is in contact with the outer surface of the roller (82), and a spring is connected between the push rod (85) and the impurity removal chamber (81).

8. A plastic extruder according to claim 6, characterized in that: The side surface of the scraper (86) is in contact with the outer surface of the filter screen (84), and the scraper (86) is located on the side of the filter screen (84) away from the water pump (87), and the scraper (86) is designed in the shape of a right triangle.

9. A plastic extruder according to claim 1, characterized in that: A spring is connected between the pressing block (92) and the extruder (1), and the pressing block (92) and the trigger rod (94) are at the same level, and the pressing block (92) is arranged opposite to the trigger rod (94).

10. A plastic extruder according to claim 1, characterized in that: A spring is connected between the trigger rod (94) and the mounting block (93), and the end of the trigger rod (94) facing the roller (82) is designed to be an isosceles trapezoid, and the end of the trigger rod (94) with the isosceles trapezoid design is engaged and connected with the roller (82) through the material storage trough (83); the buoyancy plate (95) and the rotating plate (96) are both located directly above the gap between the pressing block (92) and the trigger rod (94), and the lower end of the rotating plate (96) is designed to be an isosceles trapezoid, and the end of the rotating plate (96) with a smaller width is arranged downward.

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