Continuous extruder for producing zipper packaging bag bone strips from waste plastics and forming method thereof

Abstract

The application relates to a continuous extruder for producing zipper packaging bag bones from waste plastics and a forming method thereof, which comprises the following steps: an extruder body, a slidingly-installed extrusion plate on the extruder body, two groups of die holes arranged on the extrusion plate, a switching assembly connected with the extrusion plate, the switching assembly being capable of driving the extrusion plate to act so that materials can be extruded from the two groups of die holes, a connecting part installed on the extruder body, an elastic connection of a dredging piece and a traction frame on the connecting part, cooperation of the dredging piece and a scraping part at the end of the traction frame, removal of impurities outside the die holes, a side plate connected with the switching assembly, a guide structure arranged on the side plate, cooperation of the guide structure and an embedded shaft connected with the traction frame, driving of the traction frame to transversely move relative to the extrusion plate, and a differential assembly connected with the dredging piece and the traction frame, the differential assembly being capable of sequentially driving the traction frame and the dredging piece to act, and improvement of the yield.

Description

Technical Field

[0001] The invention relates to a continuous extruder for producing zipper packaging bag strips by utilizing waste plastics and a molding method thereof. Background Art

[0002] The zipper bag bone is a key component of the bag and is installed at the opening of the bag. Its special structural design can make the bag tightly sealed, effectively preventing food from getting damp and spoiling, and maintaining the freshness and taste of the food.

[0003] In actual production, after processing waste plastics and ensuring that they meet safety standards, they can be used to produce zipper bag strips. This not only reduces environmental pollution, but also reduces production costs, providing a sustainable development solution for the food packaging industry.

[0004] During production, processed waste plastic is first pelletized and then melted and extruded through an extruder to produce zipper bag ribs. However, during the extrusion process, impurities are easily generated at the extrusion head due to temperature issues. These impurities primarily manifest themselves as: if the temperature is too low, the material will not fully melt and will have poor fluidity, resulting in the accumulation of impurities outside the extrusion head; if the temperature is too high, the material will degrade and carbonize, with residues adhering to the outside of the extrusion head as impurities. These impurities can cause the ribs to fluctuate in size, resulting in inconsistent width and thickness, and affecting the fit of the ribs. Summary of the Invention

[0005] The object of the present invention is to provide a continuous extruder and a molding method thereof for producing zipper packaging bag strips using waste plastics, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Continuous extruder for producing zipper packaging bag strips using waste plastics, including:

[0008] An extruder body, on which an extrusion plate is slidably mounted, and on which two sets of die holes are provided;

[0009] A switching component is connected to the extrusion plate, and the switching component can drive the extrusion plate to move so that the material can be extruded from the two groups of die holes respectively;

[0010] A connecting portion is mounted on the extruder body, wherein a dredging member and a traction frame are elastically connected to the connecting portion, and the dredging member cooperates with a scraping portion at the end of the traction frame to remove impurities outside the die hole;

[0011] A side plate connected to the switching assembly, wherein a guide structure is provided on the side plate, and the guide structure cooperates with the interlocking shaft connected to the traction frame to drive the traction frame to move laterally relative to the extrusion plate;

[0012] A differential assembly connects the clearing piece and the traction frame, and the differential assembly enables the traction frame and the clearing piece to move in sequence.

[0013] As a further solution of the present invention: the switching assembly includes a connecting plate provided on the side of the extrusion plate, and two sets of limiting grooves are formed on the connecting plate;

[0014] The switching assembly further comprises a supporting structure adapted to the limiting groove and a driving structure connected to the link plate, wherein a limiting wheel adapted to the limiting groove is rotatably mounted on the supporting structure.

[0015] As a further solution of the present invention: the support structure includes a hysteresis sleeve installed on the extruder body, a telescopic shaft is slidably installed in the hysteresis sleeve, one end of the telescopic shaft is rotatably connected to the limiting wheel, and the other end of the telescopic shaft is connected to the hysteresis sleeve through a first spring.

[0016] As a further solution of the present invention: the driving structure includes an electric telescopic rod installed on the extruder body, the action end of the electric telescopic rod is connected to the side plate, and the action end of the electric telescopic rod is provided with a lag groove, and the lag groove is slidably connected to the traction piece installed on the side of the connecting plate.

[0017] As a further solution of the present invention: a transverse axis is provided on the connecting portion, a guide sleeve connected to the traction frame is slidably mounted on the transverse axis, and the guide sleeve and the transverse axis are connected via a second spring.

[0018] As a further solution of the present invention: a telescopic rod is provided on the connecting portion, the telescopic rod is connected to the dredging member, and a third spring is sleeved on the telescopic rod.

[0019] As a further solution of the present invention: the differential assembly includes a slide groove arranged on the traction frame, a slider is slidably installed in the slide groove, a pulling rod is rotatably installed on the slider, and the pulling rod is connected to the clearing member at one end away from the slider.

[0020] As a further solution of the present invention: the guide structure includes a vertical groove provided on the side plate, horizontal grooves are provided at both ends of the vertical groove, and one end of the horizontal groove away from the vertical groove is connected to the vertical groove through an inclined groove;

[0021] A deflecting member is provided at the connection between the inclined slot and the vertical slot, and a torsion spring is provided on the rotating shaft of the deflecting member.

[0022] A method for producing zipper packaging bag strips using waste plastics, using the above-mentioned continuous extruder, comprises:

[0023] The waste plastic particles are poured into the extruder body, the extruder body extrudes the molten waste plastic particles from the die hole to form the zipper packaging bag rib, after extruding for a predetermined time, the switching assembly acts, the dredging piece and the traction frame act in turn and are separated from the extrusion plate, then the extrusion plate switches position, and after the position of the extrusion plate is switched, the dredging piece and the traction frame act in turn to remove the impurities outside the die hole.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] Through the control of the movement time sequence of the extrusion plate, the dredging piece and the scraping part, firstly, the dredging piece can be separated from the die hole when the extrusion plate acts, avoiding interference between the two, secondly, after the extrusion plate completes switching, the dredging piece will be inserted into the die hole first to eject the impurities in the die hole, and then the scraping part can remove the impurities ejected by the dredging piece and generated outside the die hole, so that the die hole can maintain good extrusion performance when it is switched to the extrusion station next time, improving the extrusion effect.

[0026] Through the switching assembly, on the one hand, the two groups of die holes can be alternately switched to the extrusion station, improving the continuity of the extrusion operation, on the other hand, the position of the die hole can be positioned to avoid position deviation between the dredging piece and the die hole, and by actively driving the extrusion plate to be in place first than the side plate, the stability of the dredging piece inserted into the die hole can be improved, ensuring the stability of the impurity removal operation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Structure schematic view of an embodiment of the continuous extruder for producing zipper packaging bag rib by using waste plastic.

[0028] Figure 2 For Figure 1 Structure enlarged view of A in the middle.

[0029] Figure 3 Structure schematic view of the extruder body, the switching assembly, the connecting part, the side plate and the differential assembly in an embodiment of the continuous extruder for producing zipper packaging bag rib by using waste plastic.

[0030] Figure 4 Structure exploded view of the switching assembly in an embodiment of the continuous extruder for producing zipper packaging bag rib by using waste plastic.

[0031] Figure 5 Structure schematic view of the connecting part, the dredging piece and the traction frame in an embodiment of the continuous extruder for producing zipper packaging bag rib by using waste plastic.

[0032] Figure 6 For Figure 5Structure of the enlarged view at the middle B.

[0033] Figure 7 Structure of the exploded view of the local structure in one embodiment of the continuous extruder for producing zipper packaging bag bone strips by using waste plastics.

[0034] Figure 8 Structure diagram of the electric telescopic rod and the side plate in one embodiment of the continuous extruder for producing zipper packaging bag bone strips by using waste plastics.

[0035] Figure 9 Another angle structure diagram of the electric telescopic rod and the side plate in one embodiment of the continuous extruder for producing zipper packaging bag bone strips by using waste plastics.

[0036] Figure 10 Structure diagram of the side plate in one embodiment of the continuous extruder for producing zipper packaging bag bone strips by using waste plastics.

[0037] In the figure: 1, extruder body; 2, extrusion plate; 201, die hole; 202, guide part; 3, connecting plate; 301, limiting groove; 4, limiting wheel; 5, telescopic shaft; 6, first spring; 7, lagging sleeve; 8, traction piece; 9, electric telescopic rod; 10, side plate; 1001, vertical groove; 1002, horizontal groove; 1003, inclined groove; 11, lagging groove; 12, deflection piece; 13, traction frame; 1301, removal part; 1302, chute; 14, fitting shaft; 15, connecting part; 16, cross shaft; 17, guide sleeve; 18, second spring; 19, telescopic rod piece; 20, third spring; 21, dredging piece; 22, abutment part; 23, pull rod; 24, sliding block. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] In addition, the elements in the present application are referred to as "fixed to" or "provided on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0040] Please refer to 图1~图10The continuous extruder for producing zipper packaging bag bone strips from waste plastics in the embodiment of the application comprises an extruder body 1, a switching assembly, a connecting portion 15, a side plate 10 and a differential assembly.

[0041] The extruder body 1 is slidably provided with an extrusion plate 2, and two groups of die holes 201 are arranged on the extrusion plate 2. The side of the extrusion plate 2 facing the extruder body 1 is provided with a guide portion 202, and the guide portion 202 is in sealing sliding connection with a guide groove on the extruder body 1. This sealing sliding connection design can effectively prevent the molten waste plastic particles in the extruder body 1 from flowing out to the inside of the equipment, thereby improving the reliability, sealing performance and service life of the equipment. Under the cooperation of the guide portion 202 and the guide groove, the extrusion plate 2 can stably move in the vertical direction, so as to realize the alternation of the two groups of die holes 201 with the extruder body 1 and complete the extrusion work. This alternating use of the die holes 201 not only improves the production efficiency of the equipment, but also reduces the influence of impurities on the formation of the bone strips when the impurities exist outside one group of die holes 201, thereby improving the product quality. At the same time, the outside of the switched-out die holes 201 can be cleaned, so that the die holes 201 can restore the original extrusion performance and perform the predetermined quality of extrusion effect when switched next time, thereby ensuring the continuous production of the bone strips. In addition, this design also facilitates the maintenance and repair of the equipment, reduces the downtime of the equipment, and improves the production efficiency and economic benefits.

[0042] The switching assembly is connected to the extrusion plate 2, and the switching assembly can drive the extrusion plate 2 to move in the vertical direction of space, so that the material can be extruded from the two groups of die holes 201, respectively. Specifically, the switching assembly comprises a connecting plate 3 arranged on the side of the extrusion plate 2, and two groups of limiting grooves 301 are formed on the connecting plate 3, and the two groups of limiting grooves 301 correspond to the two groups of die holes 201, respectively.

[0043] The switching assembly further comprises a support structure matched with the limiting grooves 301 and a driving structure connected to the connecting plate 3. The support structure is rotatably provided with a limiting wheel 4 matched with the limiting grooves 301. In the initial state, the support structure makes the limiting wheel 4 have a tendency to move towards the connecting plate 3, so that when the limiting wheel 4 is in the limiting groove 301, the position of the connecting plate 3 and the extrusion plate 2 can be locked, thereby ensuring the stability of the extrusion plate 2 and avoiding the phenomenon that the extruded bone strips are twisted and deformed due to the movement of the extrusion plate 2 during the extrusion process.

[0044] Furthermore, when the limiting wheel 4 is in the limiting groove 301, the rotating shaft of the limiting wheel 4 is located on the side of the connecting plate 3 away from the limiting groove 301. This arrangement enables the limiting wheel 4 to be disengaged from the limiting groove 301 when the driving structure drives the connecting plate 3 to move, and when the limiting wheel 4 is combined with another limiting groove 301, the position of the die hole 201 is switched, and after the switching, when the limiting wheel 4 continues to cooperate with the limiting groove 301, it can still maintain the locking effect on the extrusion plate 2.

[0045] It should be noted that in the process of switching the die hole 201, due to the brief blockage in the extruder body 1, the pressure in the extruder body 1 will increase. When the die hole 201 is connected to the extruder body 1 again, the increased pressure will be released instantly, resulting in the extruded bone strips having bubbles, deformation and other adverse phenomena. Therefore, the bone strips extruded within the predetermined time of switching extrusion need to be removed in subsequent production.

[0046] Specifically, the support structure includes a hysteresis sleeve 7 installed on the extruder body 1, a telescopic shaft 5 is slidably installed in the hysteresis sleeve 7, one end of the telescopic shaft 5 is rotatably connected to the limiting wheel 4, and the other end of the telescopic shaft 5 is connected to the hysteresis sleeve 7 through a first spring 6. The driving structure includes an electric telescopic rod 9 installed on the extruder body 1, the action end of the electric telescopic rod 9 is connected to the side plate 10, and the action end of the electric telescopic rod 9 is provided with a hysteresis groove 11, and the hysteresis groove 11 is slidably connected to the traction member 8 installed on the side of the connecting plate 3.

[0047] In the initial state, the first spring 6 is in a compressed state. At this time, the first spring 6 has a force for pushing the telescopic shaft 5 toward the connecting plate 3. This force acts on the limiting wheel 4, which can ensure that the limiting wheel 4 is always in rolling contact with the side wall of the connecting plate 3, and when the limiting wheel 4 moves into the limiting groove 301, it can immediately enter the limiting groove 301, thereby locking the connecting plate 3 and the extrusion plate 2, and ensuring the stability of the basic plate 2 after the position is switched.

[0048] Since the telescopic shaft 5 and the hysteresis sleeve 7 are in a sliding connection state, the telescopic shaft 5 can only drive the limiting wheel 4 to move toward or away from the extruder body 1, that is, the telescopic shaft 5 can always maintain a state of being perpendicular to the extrusion plate 2, further ensuring the position stability of the extrusion plate 2 when the limiting wheel 4 cooperates with the limiting groove 301, ensuring that when the clearing piece 21 is subsequently actuated, it can be accurately inserted into the die hole 201, preventing the clearing piece 21 from being unable to be inserted into the die hole 201 due to misalignment between the two, causing the impurities in the die hole 201 to be unable to be cleaned or the clearing piece 21 itself to be damaged.

[0049] It should also be noted that a limit groove is provided along the length direction of the telescopic shaft 5, and the limit groove slides with the limit block provided on the hysteresis sleeve 7, so as to realize axial self-locking between the telescopic shaft 5 and the hysteresis sleeve 7, thereby preventing the telescopic shaft 5 from rotating relative to the hysteresis sleeve 7, causing the limiting wheel 4 to deflect with the telescopic shaft 5 and fail to cooperate well with the limit groove 301. In addition to the above method, the cross section of the telescopic shaft 5 can also be set to a non-circular shape, which can also achieve the same effect.

[0050] When the action end of the electric telescopic rod 9 moves, it can drive the retardation groove 11 connected thereto to move, wherein the length of the retardation groove 11 is greater than the length of the traction member 8, so that only when the end of the retardation groove 11 away from its movement direction abuts against the end of the traction member 8, can the retardation groove 11 and the traction member 8 cooperate to drive the connecting plate 3 and the extrusion plate 2 to move, and after the connecting plate 3 and the extrusion plate 2 move to a predetermined position, when the limiting wheel 4 cooperates with the limiting groove 301, the connecting plate 3 can actively drive the extrusion plate 2 to move at a speed faster than the movement speed of the action end of the electric telescopic rod 9, so that the extrusion plate 2 is positioned in advance, avoiding the inaccurate position state of the extrusion plate 2 caused by the stroke control error of the action end of the electric telescopic rod 9, and further avoiding the misalignment between the dredging member 21 and the die hole 201 after the extrusion plate 2 completes the position switching.

[0051] See also Figures 5 to 7 The connecting part 15 is installed on the extruder body 1, and the connecting part 15 is elastically connected with a clearing piece 21 and a traction frame 13. The clearing piece 21 cooperates with the shoveling part 1301 at the end of the traction frame 13 to clear impurities outside the die hole 201. In detail, the elastic connection includes: a horizontal axis 16 is provided on the connecting part 15, and a guide sleeve 17 connected to the traction frame 13 is slidably installed on the horizontal axis 16, and the guide sleeve 17 is connected to the horizontal axis 16 by a second spring 18; a telescopic rod 19 is provided on the connecting part 15, and the telescopic rod 19 is connected to the clearing piece 21, and a third spring 20 is sleeved on the telescopic rod 19, and an abutting portion 22 is provided on the clearing piece 21. When the abutting portion 22 abuts against the extrusion plate 2, the end of the clearing piece 21 away from the third spring 20 is coplanar with the outer side of the extrusion plate 2.

[0052] In this embodiment, two symmetrically arranged groups of clearing pieces 21 cooperate with two groups of traction frames 13. In the initial state, the ends of the two groups of clearing pieces 21 away from the third spring 20 are coplanar with the side of the extrusion plate 2 facing away from the extruder body 1, and the corresponding two groups of traction frames 13 are in a closed state. At this time, only one group of mold holes 201 has a clearing piece 21 inserted therein.

[0053] Before the extrusion plate 2 moves, the two groups of traction frames 13 move away from each other, so that the second spring 18 is stretched a certain amount of displacement, and the differential assembly moves to drive the clearing piece 21 away from the extrusion plate 2. During this process, the third spring 20 is compressed until the clearing piece 21 is completely misaligned with the extrusion plate 2, and the extrusion plate 2 switches its position; after the position switch, the clearing piece 21 and the traction frame 13 reset synchronously. During the reset, the clearing piece 21 is first inserted into the die hole 201 to push out the impurities in the die hole 201, and then the scraping parts 1301 on the two groups of traction frames 13 move to the die hole 201 to remove the impurities outside the die hole 201 and those pushed out by the clearing piece 21, so as to prevent the impurities from affecting the quality of the bone strips during the next switching.

[0054] The differential assembly connects the clearing piece 21 and the traction frame 13. The differential assembly enables the traction frame 13 and the clearing piece 21 to move in sequence. The differential assembly includes a slide groove 1302 arranged on the traction frame 13. A slider 24 is slidably installed in the slide groove 1302. A pulling rod 23 is rotatably installed on the slider 24. The pulling rod 23 is connected to the clearing piece 21 at one end away from the slider 24.

[0055] In the initial state, under the elastic force of the third spring 20, the end of the clearing piece 21 remains coplanar with the outside of the extrusion plate 2. At this time, the third spring 20 is in a compressed state. At the same time, the abutment portion 22 is tightly abutted against the inner side of the extrusion plate 2, further ensuring the stability of the end of the clearing piece 21 being coplanar with the outside of the extrusion plate 2, effectively avoiding the problem of insufficient movement stroke of the clearing piece 21 resulting in the inability to completely remove impurities in the mold hole 201, and also preventing interference with the scraping portion 1301 caused by excessive stroke.

[0056] When the two groups of traction frames 13 are pulled and move away from each other, the slider 24 can slide freely in the slide groove 1302. At this time, the clearing piece 21 remains stationary. When the traction frame 13 moves until the die hole 201 is completely exposed, the slider 24 reaches one end of the slide groove 1302. As the traction frame 13 continues to move, the slider 24 begins to move synchronously with the traction frame 13, and drives the clearing piece 21 to move through the pulling rod 23, so that the third spring 20 is further stretched until the clearing piece 21 is completely separated from the extrusion plate 2; at this time, the position of the extrusion plate 2 is switched, and after the switching is completed, the traction frame 13 and the clearing piece 21 start to move in the opposite direction. During this process, the clearing piece 21 can enter the die hole 201 first, and then the shoveling part 1301 moves relatively close to the outer surface of the extrusion plate 2, thereby effectively removing impurities inside and outside the die hole 201, laying a good foundation for subsequent extrusion operations.

[0057] See also Figure 5 、 Figures 7 to 10The side plate 10 is connected to the electric telescopic rod 9, and a guide structure is provided on the side plate 10. The guide structure cooperates with the interlocking shaft 14 connected to the traction frame 13 to drive the traction frame 13 to move horizontally relative to the extrusion plate 2;

[0058] The guide structure includes a vertical groove 1001 provided on the side plate 10, with horizontal grooves 1002 provided at both ends of the vertical groove 1001, and one end of the horizontal groove 1002 away from the vertical groove 1001 is connected to the vertical groove 1001 through an inclined groove 1003;

[0059] A deflecting member 12 is provided at the connection between the inclined slot 1003 and the vertical slot 1001 , and a torsion spring is provided on the rotating shaft of the deflecting member 12 ;

[0060] As can be seen from the above, the length of the retardation groove 11 is greater than the length of the traction member 8. When the action end of the electric telescopic rod 9 starts to move, the traction member 8 moves relative to the retardation groove 11. At this time, the extrusion plate 2 is stationary, and the side plate 10 follows the action end of the electric telescopic rod 9 to move, driving the interlocking shaft 14 to move along the inclined groove 1003, driving the two sets of traction frames 13 away from each other. When the traction frame 13 moves to the predetermined position and the dredging member 21 is separated from the extrusion plate 2, the interlocking shaft 14 reaches the end of the inclined groove 1003, acting on the deflection member 12 to deflect it. At the same time, the end of the retardation groove 11 is fitted with the end of the traction member 8, and the position of the extrusion plate 2 is switched. Since the dredging member 21 is separated from the extrusion plate 2, interference with the dredging member 21 during movement of the extrusion plate 2 is avoided.

[0061] When the side plate 10 is about to move to the end of the stroke, the limiting groove 301 cooperates with the limiting wheel 4 to actively drive the extrusion plate 2 to move and lock it. When the side plate 10 reaches the end of the stroke, the interlocking shaft 14 moves to the other end of the vertical groove 1001. Under the action of the second spring 18 and the third spring 20, the interlocking shaft 14 moves along the horizontal groove 1002, driving the clearing piece 21 and the traction frame 13 to move, and clean the impurities inside and outside the mold hole 201.

[0062] In this embodiment, the deflection member 12 can only move toward the vertical groove 1001. When the interlocking shaft 14 moves from the inclined groove 1003 to the vertical groove 1001, the deflection member 12 deflects once and then resets under the action of the torsion spring. As the interlocking shaft 14 continues to move, when it abuts against another deflection member 12, the deflection member 12 guides the interlocking shaft 14 to continue moving along the vertical groove 1001, preventing it from moving along the other inclined groove 1003, ensuring that after the extrusion plate 2 is in place, the clearing member 21 and the traction frame 13 move again, thereby improving the orderliness of the movement of each component.

[0063] As an embodiment of the present invention, a method for producing zipper packaging bag strips using waste plastics is also proposed, using the above-mentioned continuous extruder, comprising:

[0064] The waste plastic particles are poured into the extruder body 1, and the extruder body 1 extrude the melted waste plastic particles from the die hole 201 to form zipper packaging bag strips. After the predetermined extrusion time, the switching component is activated to make the clearing piece 21 and the traction frame 13 move in sequence and separate from the extrusion plate 2. Then the extrusion plate 2 switches its position, and after the position of the extrusion plate 2 is switched, the clearing piece 21 and the traction frame 13 move in sequence to remove impurities outside the die hole 201.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0066] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A continuous extruder for producing zipper packaging bag strips using waste plastics, characterized in that: include: An extruder body (1), an extrusion plate (2) being slidably mounted on the extruder body (1), and two groups of die holes (201) being provided on the extrusion plate (2); A switching component connected to the extrusion plate (2), wherein the switching component can drive the extrusion plate (2) to move so that the material can be extruded from the two groups of die holes (201) respectively; A connecting portion (15) is mounted on the extruder body (1), wherein a dredging member (21) and a traction frame (13) are elastically connected to the connecting portion (15), and the dredging member (21) cooperates with a scraping portion (1301) at the end of the traction frame (13) to remove impurities outside the die hole (201); A side plate (10) is connected to the switching assembly, and a guide structure is provided on the side plate (10). The guide structure cooperates with a fitting shaft (14) connected to the traction frame (13) to drive the traction frame (13) to move laterally relative to the extrusion plate (2); A differential assembly connects the dredging member (21) and the traction frame (13), wherein the differential assembly enables the traction frame (13) and the dredging member (21) to move in sequence; The switching assembly comprises a connecting plate (3) arranged on the side of the extrusion plate (2), and a driving structure connected to the connecting plate (3); The driving structure comprises an electric telescopic rod (9) mounted on the extruder body (1), the action end of the electric telescopic rod (9) is connected to a side plate (10), and a retardation groove (11) is provided on the action end of the electric telescopic rod (9), the retardation groove (11) is slidably connected to a traction member (8) mounted on the side of the connecting plate (3), and the length of the retardation groove (11) is greater than the length of the traction member (8); A transverse shaft (16) is provided on the connecting portion (15), a guide sleeve (17) connected to the traction frame (13) is slidably mounted on the transverse shaft (16), and the guide sleeve (17) and the transverse shaft (16) are connected via a second spring (18); A telescopic rod (19) is provided on the connecting portion (15), the telescopic rod (19) is connected to the dredging member (21), and a third spring (20) is sleeved on the telescopic rod (19); The differential assembly includes a slide groove (1302) provided on the traction frame (13), a slider (24) is slidably installed in the slide groove (1302), a pulling rod (23) is rotatably installed on the slider (24), and an end of the pulling rod (23) away from the slider (24) is connected to the dredging member (21); The guide structure comprises a vertical groove (1001) provided on the side plate (10), horizontal grooves (1002) are provided at both ends of the vertical groove (1001), and one end of the horizontal groove (1002) away from the vertical groove (1001) is connected to the vertical groove (1001) via an inclined groove (1003); A deflecting member (12) is provided at the connection between the inclined slot (1003) and the vertical slot (1001), and a torsion spring is provided on the rotating shaft of the deflecting member (12).

2. The continuous extruder for producing zipper packaging bag strips using waste plastics according to claim 1, characterized in that: Two groups of limiting grooves (301) are formed on the connecting plate (3); The switching assembly further comprises a supporting structure adapted to the limiting groove (301), and a limiting wheel (4) adapted to the limiting groove (301) is rotatably mounted on the supporting structure.

3. The continuous extruder for producing zipper packaging bag strips using waste plastics according to claim 2, characterized in that: The support structure comprises a hysteresis sleeve (7) mounted on the extruder body (1), a telescopic shaft (5) being slidably mounted in the hysteresis sleeve (7), one end of the telescopic shaft (5) being rotationally connected to the limiting wheel (4), and the other end of the telescopic shaft (5) being connected to the hysteresis sleeve (7) via a first spring (6).

4. A method for producing zipper packaging bag strips using waste plastics, characterized in that: The continuous extruder according to any one of claims 1 to 3 comprises: The waste plastic particles are poured into the extruder body (1), and the extruder body (1) extrude the melted waste plastic particles from the die hole (201) to form zipper packaging bag strips. After a predetermined extrusion time, the components are switched to operate, so that the clearing piece (21) and the traction frame (13) are operated in sequence and separated from the extrusion plate (2). Then, the extrusion plate (2) switches its position, and after the position of the extrusion plate (2) is switched, the clearing piece (21) and the traction frame (13) are operated in sequence to remove impurities outside the die hole (201).

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