A waste plastic recycling pressure forming device and method

Abstract

This invention relates to the recycling of plastic waste, and more specifically to a pressure molding device and method for recycling waste plastics. The device includes a raw material cavity, with a molding die slidably connected to the upper end of the raw material cavity. The molding die has multiple rows of molding holes. The method includes the following steps: Step 1: Raw material is introduced into the raw material cavity, and the raw material cavity is compressed by two limiting sliders at its upper part before entering the molding die; Step 2: The raw material is extruded and molded through the multiple molding holes on the molding die; Step 3: The molding die is moved, causing it to slide back and forth at the upper end of the raw material cavity, completing the extrusion molding of the raw material in batches. Waste plastic can be extruded into the molding die, forming it into a certain regular shape.

Description

Technical Field

[0001] This invention relates to the recycling of plastic waste, and more specifically to a pressure molding equipment and method for recycling waste plastics. Background Technology

[0002] Pressure molding equipment for waste plastic recycling is a key piece of equipment for realizing plastic recycling. It is mainly used to transform waste plastics, such as films, bottle flakes, and granules, into recycled products through processes such as heating and compression. In the current technology, when extruding and recycling waste plastics, the equipment uses strong pressure to force the waste plastics through molding holes for molding. Although the waste plastics processed in this way have a certain shape, due to the material and numerous pores of the waste plastics themselves, the strength of the molded waste plastics after passing through the molding holes is inconsistent, and the fracture points are inconsistent, making it impossible to form a regular shape, resulting in high subsequent processing costs. Summary of the Invention

[0003] The purpose of this invention is to provide a pressure molding device and method for recycling waste plastics, which can extrude waste plastics into a molding die to form the waste plastics into a certain regular shape.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A pressure molding device for recycling waste plastics includes a raw material chamber, a molding die slidably connected to the upper end of the raw material chamber, and multiple rows of molding holes provided on the molding die; an extrusion plate is slidably connected inside the molding holes.

[0006] Both sides of the bottom of the raw material cavity are fixedly connected to a feeding cylinder, and an inlet pipe is fixedly connected to the feeding cylinder. A spiral shaft is rotatably connected inside the feeding cylinder, and a drive motor II for driving the spiral shaft to rotate is fixedly connected to the feeding cylinder. The feeding cylinder and the raw material cavity are connected.

[0007] Two homogenizing plates are provided in the raw material cavity. Two telescopic mechanisms I are fixedly connected to the raw material cavity. A sliding column I is fixedly connected to the telescopic end of the telescopic mechanism I. The sliding column I is slidably connected to the raw material cavity. The end of the sliding column I extends into the raw material cavity. A spring I is fixedly connected between the end of the sliding column I and the homogenizing plate.

[0008] The homogenizing plate is provided with a plurality of homogenizing holes;

[0009] Both sides of the upper end of the raw material cavity are fixedly connected to closed side plates. Two telescopic mechanisms II are fixedly connected to the raw material cavity. Cooling cavities are fixedly connected to the telescopic ends of the two telescopic mechanisms II. Limiting sliders are fixedly connected to the two cooling cavities. The two limiting sliders are slidably connected to both sides of the upper end of the raw material cavity. The two ends of the limiting sliders are respectively covered by the two closed side plates. Cooling water pipes are connected to the cooling cavities. The upper end surface of the cooling cavities is flush with the upper end surface of the limiting sliders.

[0010] The molding die is slidably connected between two closed side plates, and the lower end of the molding die is attached between two cooling chambers and two limiting sliders.

[0011] A sliding rail is fixedly connected to the raw material cavity, a lead screw is rotatably connected to the sliding rail, and a drive motor I for driving the lead screw to rotate is fixedly connected to the sliding rail.

[0012] A sliding seat is fixedly connected to the molding die, the sliding seat is slidably connected to the sliding rail, and the sliding seat is threadedly connected to the lead screw;

[0013] The forming mold is fixedly connected to a telescopic mechanism Ⅲ, and a lifting bracket is fixedly connected to the telescopic end of the telescopic mechanism Ⅲ. Multiple insertion molds are fixedly connected to the lifting bracket. The multiple insertion molds are inserted into multiple forming holes respectively. Each insertion mold is slidably connected to a sliding column Ⅱ. An extrusion plate is fixedly connected to the bottom of the sliding column Ⅱ. A spring Ⅱ is fixedly connected between the top of the sliding column Ⅱ and the lifting bracket.

[0014] A method for pressure molding recycling of waste plastics, the method comprising the following steps:

[0015] Step 1: The raw material is fed into the raw material cavity, which is then compressed by the two limiting sliders at the top and enters the molding die.

[0016] Step 2: The raw material enters the molding die and is extruded into shape through multiple molding holes.

[0017] Step 3: Move the molding die so that it slides back and forth at the top of the raw material cavity to complete the extrusion molding of the raw materials in batches. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 This is a schematic diagram of the waste plastic recycling pressure molding equipment of the present invention;

[0020] Figure 2 This is a schematic diagram of the waste plastic recycling pressure molding equipment of the present invention;

[0021] Figure 3 This is a side view of the waste plastic recycling pressure molding equipment of the present invention;

[0022] Figure 4 This is a schematic diagram of the raw material cavity structure of the present invention;

[0023] Figure 5 This is a cross-sectional view of the raw material cavity of the present invention;

[0024] Figure 6 This is a schematic diagram of the feeding cylinder structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the homogeneous plate structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the limiting slider structure of the present invention;

[0027] Figure 9 This is a schematic diagram of the cooling cavity structure of the present invention;

[0028] Figure 10 This is a bottom view of the cooling cavity of the present invention;

[0029] Figure 11 This is a schematic diagram of the molding die structure of the present invention;

[0030] Figure 12 This is a schematic diagram of the extrusion plate structure of the present invention;

[0031] Figure 13 This is a schematic diagram of the insertion mold structure of the present invention.

[0032] In the diagram: Raw material cavity 11; Closed side plate 12; Sliding rail 13; Lead screw 14; Drive motor I 15; Feed cylinder 21; Drive motor II 22; Screw shaft 23; Feed pipe 24; Telescopic mechanism I 31; Sliding column I 32; Homogenizing plate 33; Limiting slider 41; Cooling cavity 42; Cooling water pipe 43; Telescopic mechanism II 44; Forming mold 51; Forming hole 52; Sliding seat 53; Telescopic mechanism III 61; Lifting bracket 62; Insertion mold 63; Extrusion plate 64; Sliding column II 65. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings.

[0034] like Figures 1 to 13 As shown below, the structure and function of a pressure molding equipment for recycling waste plastics will be described in detail.

[0035] To address the technical problem of shaping waste plastics into regular shapes, an embodiment of a pressure molding device for recycling waste plastics is described in detail below.

[0036] A pressure molding device for recycling waste plastics includes a raw material cavity 11, a molding die 51 is slidably connected to the upper end of the raw material cavity 11, the molding die 51 is provided with multiple rows of molding holes 52, and an extrusion plate 64 is slidably connected in the molding holes 52.

[0037] Molten waste plastic material is fed into the material cavity 11. The material moves upward in the material cavity 11 and enters the forming hole 52 in the forming mold 51. The material is extruded and formed in the forming hole 52, which can be circular or rectangular. Through the extrusion of the extrusion plate 64, the material is formed into a regular shape, which is convenient for subsequent use. Compared with the existing technology that only uses forming holes, the addition of the extrusion of the extrusion plate 64 makes the material forming more regular. Furthermore, the height of the extrusion plate 64 can control the length of the material forming and can also expel air from the inside of the material through extrusion.

[0038] Furthermore, in order to solve the technical problem of feeding materials into the raw material cavity 11, a feeding cylinder 21 is provided;

[0039] The bottom of the raw material cavity 11 is fixedly connected to two sides of the feeding cylinder 21, that is, there are two feeding cylinders 21. The two feeding cylinders 21 feed the raw material into the raw material cavity 11 from both sides. The purpose of setting two feeding cylinders 21 is to take advantage of the rectangular structure of the raw material cavity 11, so that the raw material can be fed into the raw material cavity 11 quickly and evenly from both sides. Compared with one feeding cylinder 21, the method of feeding the raw material from both sides with two feeding cylinders 21 can make the raw material enter the raw material cavity 11 quickly and evenly.

[0040] A feed pipe 24 is fixedly connected to the feed cylinder 21, a screw shaft 23 is rotatably connected inside the feed cylinder 21, and a drive motor II 22 for driving the screw shaft 23 to rotate is fixedly connected to the feed cylinder 21. The feed cylinder 21 is connected to the raw material chamber 11.

[0041] In use, the waste plastic raw material is crushed and put into the feed pipe 24. The feed pipe 24 is connected to the feeding cylinder 21, and then the waste plastic raw material enters the feeding cylinder 21. The feeding cylinder 21 is equipped with a heating mechanism, which heats the waste plastic raw material to make it melt. The drive motor II 22 is started. The drive motor II 22 is preferably a servo motor. The output shaft of the drive motor II 22 drives the spiral shaft 23 to rotate. When the spiral shaft 23 rotates, it generates a lateral pushing force, which pushes the molten waste plastic raw material into the raw material cavity 11.

[0042] Furthermore, a stirring mechanism can be provided on the spiral shaft 23. The stirring mechanism can be a convex point, a stirring column arranged laterally through the spiral shaft 23, or a blade-shaped stirring blade. The convex point and the blade-shaped stirring blade are set on the surface of the spiral body of the spiral shaft 23. Then, during the rotation of the spiral shaft 23, the stirring mechanism is driven to rotate by the spiral shaft 23, that is, the convex point, stirring column, or stirring blade is driven to rotate by the spiral shaft 23, so that the convex point, stirring column, or stirring blade can stir the waste plastic raw material to a certain extent. The structure of the convex point, stirring column, or stirring blade is not shown in the figure. As long as it can stir, it is fine. This can make the waste plastic raw material evenly distributed.

[0043] This presents a technical problem. Since the raw material cavity 11 is rectangular, this structure can perform injection molding on a row of molding holes 52. However, since the rotation of the spiral shaft 23 requires the feed cylinder 21 to be circular, it is easy to cause uneven distribution of the raw material entering the raw material cavity 11.

[0044] Therefore, two homogenizing plates 33 are provided in the raw material cavity 11, and two telescopic mechanisms I 31 are fixedly connected to the raw material cavity 11. A sliding column I 32 is fixedly connected to the telescopic end of the telescopic mechanism I 31. The sliding column I 32 is slidably connected to the raw material cavity 11, and the end of the sliding column I 32 extends into the raw material cavity 11. A spring I is fixedly connected between the end of the sliding column I 32 and the homogenizing plate 33.

[0045] When it is necessary to ensure uniform distribution of the raw material within the raw material cavity 11, the telescopic mechanism I31 is activated. The telescopic mechanism I31 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism I31 drives the sliding column I32 to move, causing the sliding column I32 to slide on the raw material cavity 11. This continuous up-and-down reciprocating motion of the sliding column I32 pulls the spring I, which in turn pulls the end of the homogenizing plate 33, causing the homogenizing plate 33 to oscillate. Figure 6 As shown, the inner ends of the two homogenizing plates 33 are rotatably connected to the side wall of the raw material cavity 11, and the spring I is fixedly connected to the outer ends of the two homogenizing plates 33. Therefore, when the sliding column I 32 moves up and down, it will pull the outer ends of the homogenizing plates 33 to swing up and down. Since the feeding cylinder 21 feeds the raw material into the raw material cavity 11 from the side, it may cause more raw material on both sides and less raw material in the middle. Therefore, when the outer side of the homogenizing plate 33 swings up and down, it pushes the raw material on both sides towards the middle, thereby achieving the effect of homogenization.

[0046] like Figure 7As shown, the homogenizing plate 33 is provided with multiple homogenizing holes, so that during the swinging process of the homogenizing plate 33, that is, during the material pushing process, a certain amount of raw material can still pass through the homogenizing plate 33, which will not cause the raw material to be too concentrated, and can also play a certain material dispersion technical effect.

[0047] Because the types of waste plastic materials are different, the physical properties of the waste plastic materials may be different. For example, some waste plastic materials are easy to shape. In order to ensure processing efficiency, the opening at the top of the material cavity 11 can be enlarged. However, the preferred waste plastic materials are not easy to shape and require greater extrusion pressure. Therefore, the opening at the top of the material cavity 11 needs to be reduced.

[0048] Therefore, closed side plates 12 are fixedly connected to both sides of the upper end of the raw material cavity 11. Two telescopic mechanisms II 44 are fixedly connected to the raw material cavity 11. Cooling cavities 42 are fixedly connected to the telescopic ends of the two telescopic mechanisms II 44. Limiting sliders 41 are fixedly connected to the two cooling cavities 42. The two limiting sliders 41 are slidably connected to both sides of the upper end of the raw material cavity 11. The two ends of the limiting sliders 41 are respectively covered on the two closed side plates 12. Cooling water pipes 43 are connected to the cooling cavities 42. The upper end surface of the cooling cavities 42 is flush with the upper end surface of the limiting sliders 41.

[0049] The molding die 51 is slidably connected between two closed side plates 12, and the lower end of the molding die 51 is attached between two cooling chambers 42 and two limiting sliders 41.

[0050] like Figure 8 As shown, when it is necessary to control the size of the opening at the upper end of the raw material cavity 11, the telescopic mechanism II 44 is activated. The telescopic mechanism II 44 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism II 44 drives the cooling cavity 42 to move. The cooling cavity 42 drives the limiting slider 41 to move, so that the limiting slider 41 slides on the raw material cavity 11, thereby adjusting the size of the opening at the upper end of the raw material cavity 11, and thus adjusting the size of the injection opening to meet the processing requirements of waste plastic raw materials.

[0051] Furthermore, in order to ensure the sealing of the contact position between the limiting slider 41 and the raw material cavity 11, a sealing gasket can be provided between the limiting slider 41 and the raw material cavity 11.

[0052] Furthermore, a cooling water pipe is pre-connected to the cooling water pipe 43, and cooling water is introduced into the cooling chamber 42, so that the cooling chamber 42 can cool and mold the raw material in the molding hole 52. At the same time, due to the adjustment of the size of the opening at the upper end of the raw material chamber 11, the position of the limiting slider 41 is adjusted accordingly, and the position of the cooling chamber 42 is also adjusted accordingly. When the opening at the upper end of the raw material chamber 11 becomes smaller, the injection time increases, so a longer cooling contact time is not required. Thus, the relative proximity of the two cooling chambers 42 shortens the injection cooling time and matches the size of the opening of the raw material chamber 11. Conversely, when the opening at the upper end of the raw material chamber 11 becomes larger, the injection time decreases, so a longer cooling contact time is required. Thus, the relative distance of the two cooling chambers 42 increases the injection cooling time and matches the size of the opening of the raw material chamber 11.

[0053] Furthermore, during the injection molding process, when the molding die 51 slides relative to the upper end of the raw material cavity 11, the raw material cavity 11 can then perform injection molding on the multiple rows of molding holes 52 on the molding die 51.

[0054] Furthermore, to improve molding quality and prevent the bottom of the molded part in contact with the cooling cavity 42 from cooling too quickly, potentially forming a low-crystallinity structure that leads to decreased strength and toughness, while the surrounding area cools slowly, resulting in high crystallinity and brittle material, an independent cavity can be formed around each row of molding holes 52. A flowing cooling liquid, such as cooling water, can be introduced into this cavity to cool the area around each molding hole 52 in that row, resulting in a more uniform temperature drop and thus improving molding quality.

[0055] The cooling liquid in each row of forming holes 52 is not interconnected, so that cooling is only applied to the area around the row of forming holes 52 where the plastic material has been injected.

[0056] A sliding rail 13 is fixedly connected to the raw material cavity 11, a lead screw 14 is rotatably connected to the sliding rail 13, and a drive motor I 15 for driving the lead screw 14 to rotate is fixedly connected to the sliding rail 13; the drive motor I 15 is preferably a servo motor.

[0057] A sliding seat 53 is fixedly connected to the molding die 51. The sliding seat 53 is slidably connected to the sliding rail 13. The sliding seat 53 is threadedly connected to the lead screw 14. The sliding seat 53 and the lead screw 14 are connected by a lead screw drive.

[0058] Therefore, the drive motor I15 is started, and the output shaft of the drive motor I15 begins to rotate. The output shaft of the drive motor I15 drives the lead screw 14 to rotate. When the lead screw 14 rotates, it drives the sliding seat 53 to move laterally through the thread. The sliding seat 53 drives the molding die 51 to move laterally, so that the molding die 51 slides at the upper end of the raw material cavity 11. Then, after the raw material cavity 11 has finished injection molding a row of molding holes 52 on the molding die 51, the molding die 51 moves laterally, and the injection-molded raw material moves to the cooling cavity 42 for cooling. The raw material cavity 11 then injection molds the next row of molding holes 52. In this way, the molding die 51 moves laterally back and forth on the raw material cavity 11. That is, the molding die 51 moves to the limit position on one side. After the raw material cavity 11 has finished injection molding the last row of molding holes 52, the molding die 51 moves in the opposite direction. This process is repeated to complete the cycle.

[0059] In the process of implementing this patent, it is sometimes necessary to control the length of the raw material processing;

[0060] Therefore, a telescopic mechanism Ⅲ61 is fixedly connected to the forming mold 51, a lifting bracket 62 is fixedly connected to the telescopic end of the telescopic mechanism Ⅲ61, a plurality of insertion molds 63 are fixedly connected to the lifting bracket 62, the plurality of insertion molds 63 are respectively inserted into a plurality of forming holes 52, a sliding column Ⅱ65 is slidably connected to each insertion mold 63, an extrusion plate 64 is fixedly connected to the bottom of the sliding column Ⅱ65, and a spring Ⅱ is fixedly connected between the top of the sliding column Ⅱ65 and the lifting bracket 62.

[0061] When it is necessary to control the length of the raw material forming in the forming hole 52, the telescopic mechanism III 61 is activated. The telescopic mechanism III 61 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism III 61 drives the lifting bracket 62 to move. The lifting bracket 62 drives the insertion mold 63 to move, adjusting the depth of the insertion mold 63 into the forming hole 52. Thus, when the raw material is injected into the forming hole 52, the raw material is injected from bottom to top. This injection method can reduce the generation of air bubbles. At the same time, the raw material will push the extrusion plate 64 to move upward. The extrusion plate 64 drives the sliding column II 65 to move upward, pulling the spring II. The spring II generates a reaction force to push the extrusion plate 64 downward to extrude the raw material, so that the raw material is extruded and formed. When the extrusion plate 64 moves upward to contact the insertion mold 63, the extrusion plate 64 can no longer move upward, thus controlling the height of the insertion mold 63, which in turn controls the forming height of the raw material.

[0062] Furthermore, in order to improve molding quality and prevent the top of the plastic material in the molding hole 52 from cooling slowly, resulting in high crystallinity and brittleness, the extrusion plate 64 and the sliding column II 65 can be provided with hollow and interconnected cavities. This allows flowing cooling liquid, such as cooling water, to be introduced into the cavities, thereby cooling the top of the plastic material in the molding hole 52 and making the temperature drop more uniform, thus improving molding quality.

[0063] Furthermore, this is an optimization description of the previous embodiment;

[0064] After injection molding is completed, the limiting slider 41 and the cooling cavity 42 leave the molding hole 52 and no longer provide rigid support for the molding hole 52. The spring II returns to its original position, so the material in the molding hole 52 will move downward under the push of the extrusion plate 64, so that the material is discharged from the molding hole 52 and the extrusion plate 64 returns to its original position. This allows for cyclic injection molding.

[0065] A method for pressure molding recycling of waste plastics, the method comprising the following steps:

[0066] Step 1: The raw material is fed into the raw material cavity 11. The raw material cavity 11 is compressed by the two limiting sliders 41 on its upper part and then enters the molding die 51.

[0067] Step 2: The raw material enters the multiple forming holes 52 provided on the forming mold 51 and is extruded and formed; through the extrusion of the extrusion plate 64, the raw material is formed into a regular shape;

[0068] Step 3: Move the molding die 51 so that it slides back and forth on the upper end of the raw material cavity 11 to complete the extrusion molding of the raw material in batches; that is, after the molding die 51 moves to the extreme position on one side and the raw material cavity 11 completes the injection molding of the last row of molding holes 52, the molding die 51 moves in the opposite direction, and so on, to complete the cycle processing.

Claims

1. A waste plastic recycling pressure forming apparatus comprising a raw material cavity (11), characterized in that: The upper end of the raw material cavity (11) is slidably connected to a molding die (51), and the molding die (51) is provided with multiple rows of molding holes (52), and an extrusion plate (64) is slidably connected inside the molding holes (52). The forming mold (51) is fixedly connected to a telescopic mechanism III (61), and a lifting bracket (62) is fixedly connected to the telescopic end of the telescopic mechanism III (61). Multiple insertion molds (63) are fixedly connected to the lifting bracket (62). The multiple insertion molds (63) are inserted into multiple forming holes (52) respectively. Each insertion mold (63) is slidably connected to a sliding column II (65). The bottom of the sliding column II (65) is fixedly connected to an extrusion plate (64). A spring II is fixedly connected between the top of the sliding column II (65) and the lifting bracket (62).

2. The pressure molding equipment for recycling waste plastics according to claim 1, characterized in that: The bottom of the raw material cavity (11) is fixedly connected to both sides of the feeding cylinder (21), the feeding cylinder (21) is fixedly connected to the feeding pipe (24), the feeding cylinder (21) is rotatably connected to the spiral shaft (23), the feeding cylinder (21) is fixedly connected to the driving motor II (22) for driving the spiral shaft (23) to rotate, and the feeding cylinder (21) and the raw material cavity (11) are connected.

3. The pressure molding equipment for recycling waste plastics according to claim 1, characterized in that: Two homogenizing plates (33) are provided inside the raw material cavity (11). Two telescopic mechanisms I (31) are fixedly connected to the raw material cavity (11). A sliding column I (32) is fixedly connected to the telescopic end of the telescopic mechanism I (31). The sliding column I (32) is slidably connected to the raw material cavity (11). The end of the sliding column I (32) extends into the raw material cavity (11). A spring I is fixedly connected between the end of the sliding column I (32) and the homogenizing plate (33).

4. The pressure molding equipment for recycling waste plastics according to claim 3, characterized in that: The homogenizing plate (33) is provided with a plurality of homogenizing holes.

5. The pressure molding equipment for recycling waste plastics according to claim 1, characterized in that: The raw material cavity (11) is fixedly connected to both sides of the upper end with closed side plates (12). Two telescopic mechanisms II (44) are fixedly connected to the raw material cavity (11). Cooling cavities (42) are fixedly connected to the telescopic ends of the two telescopic mechanisms II (44). Limiting sliders (41) are fixedly connected to the two cooling cavities (42). The two limiting sliders (41) are slidably connected to both sides of the upper end of the raw material cavity (11). The two ends of the limiting sliders (41) are covered on the two closed side plates (12). Cooling water pipes (43) are connected to the cooling cavities (42). The upper end surface of the cooling cavities (42) is flush with the upper end surface of the limiting sliders (41).

6. The pressure molding equipment for recycling waste plastics according to claim 5, characterized in that: The molding die (51) is slidably connected between two closed side plates (12), and the lower end of the molding die (51) is attached between two cooling cavities (42) and two limiting sliders (41).

7. The waste plastic recycling pressure molding equipment according to claim 6, characterized in that: A sliding rail (13) is fixedly connected to the raw material cavity (11), a lead screw (14) is rotatably connected to the sliding rail (13), and a drive motor I (15) for driving the lead screw (14) to rotate is fixedly connected to the sliding rail (13).

8. The waste plastic recycling pressure molding equipment according to claim 7, characterized in that: A sliding seat (53) is fixedly connected to the molding die (51). The sliding seat (53) is slidably connected to the sliding rail (13). The sliding seat (53) is threadedly connected to the lead screw (14).

9. A method for using the pressure molding equipment for recycling waste plastics as described in claim 8, characterized in that: The method includes the following steps: Step 1: The raw material is fed into the raw material cavity (11). The raw material cavity (11) is compressed by the two limiting sliders (41) on its upper part and then enters the molding die (51). Step 2: The raw material enters the molding die (51) and is extruded through multiple molding holes (52). Step 3: Move the molding die (51) so that the molding die (51) slides back and forth on the upper end of the raw material cavity (11) to complete the extrusion molding of the raw materials in batches.

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