Novel plastic extruding machine with high product forming rate for manufacturing PVC (Polyvinyl Chloride) pipeline and method

Abstract

The invention relates to the technical field of PVC (polyvinyl chloride) pipeline processing, in particular to a novel plastic extruding machine with high product forming rate for PVC pipeline manufacturing and a method. The device comprises a discharging mechanism, a plasticizing mechanism and a pipe fitting forming mechanism, the discharging mechanism at least comprises a hopper, the plasticizing mechanism at least comprises a plasticizing pipe, the pipe fitting forming mechanism at least comprises a fixed mold and a movable mold, the plasticizing pipe is communicated with the fixed mold, and the bottom of the hopper is communicated with the top of the plasticizing pipe; according to the novel plastic extruding machine with the high product forming rate for PVC pipeline manufacturing, the discharging speed of plastic raw materials is controlled through the arranged discharging mechanism, and meanwhile water attached to plastic particles is dried through heat dissipated in the plasticizing mechanism. After falling into the hopper, the plastic particles gradually gather at the tops of the two movable plates, and a narrow gap is formed between the two movable plates, so that heat in the plasticizing pipe can be dissipated upwards, and water attached to the plastic particles at the tops of the movable plates is dried.

Description

Technical Field

[0001] The invention relates to the technical field of PVC pipe processing, in particular to a new extruder and method for manufacturing PVC pipes with a high product forming rate. Background Art

[0002] The forming rate of PVC pipes is affected by many factors, among which the feeding speed and the dryness of the plastic raw materials have a particularly significant impact on the forming rate of pipe products.

[0003] According to a Chinese patent with announcement number CN118404774B, an injection molding mechanism of an injection molding machine used for a 5G antenna cover is disclosed. The application uses a first hydraulic rod to push the first template and the second template to close the mold. The second template pushes the rotating arm to rotate and push the second sliding rod through the push rod, thereby increasing the inclination angle of the movable plate, allowing the raw material to enter the drying tank from the storage bin, so that intermittent material feeding can be carried out during the injection molding process, and the feeding rhythm is consistent with the closing frequency, so that the material can be adequately supplied and the problem of excessive material feeding in existing equipment causing pipeline blockage is avoided. It can be seen that when the plastic raw material in the hopper falls into the heating pipe, the feeding speed needs to be controlled, otherwise it is easy to cause pipeline blockage, thereby affecting the processing efficiency of the product.

[0004] According to the Chinese patent with the announcement number CN116373217B, an injection molding machine for mold processing is disclosed. This application improves the inside of the feed hopper, which can effectively increase the hot air flow efficiency from the dryer and reduce the upward resistance of the hot air. By driving the inner and outer parts of the raw materials to turn alternately, the wind plate and the contact rod stir the raw materials on the outside when they rotate together, so that the raw materials accumulated in the inner cavity of the middle cover generate kinetic energy inside the whole. The inner and outer raw materials rotate by mutual friction to reduce the superimposed gravity generated from top to bottom, thereby effectively increasing the gap between the small particles of the raw materials and accelerating the hot air flow efficiency. It can be seen that the raw materials need to be dried during injection molding production. If the raw materials contain moisture, on the one hand, the obtained product will contain bubbles; on the other hand, the mold sticking phenomenon will occur, which makes it more difficult to demold the product.

[0005] When processing plastic components, such as PVC pipes, the existing extruder needs to control the speed of material discharging by setting a control balance mechanism (structures such as the push rod, rotating arm and movable plate in the patent with the announcement number CN118404774B), but the water contained in the plastic raw material is not processed. In the long run, the plastic raw material will form a kind of "glue" effect with water after melting due to the internal water content, so that the wall sticking phenomenon occurs at the connection between the heating pipe and the hopper, which will affect the subsequent discharging of the plastic raw material. For the presence of water in the plastic raw material, the existing extruder usually adds a drying mechanism (the dryer in the patent with the announcement number CN116373217B) in the hopper, and does not utilize the heat generated by the original structure in the extruder, which not only causes waste in energy consumption, but also does not control the speed at which the plastic raw material enters the heating pipe. If too much feed is fed, it will cause pipeline blockage, affecting the forming rate of the product.

[0006] In view of this, we propose a new extruder and method with high product forming rate for PVC pipe manufacturing to improve the shortcomings of the prior art. Summary of the invention

[0007] The object of the present invention is to provide a new extruder and method for manufacturing PVC pipes with a high product forming rate, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned object, one of the objects of the present invention is to provide a new extruder with a high product forming rate for manufacturing PVC pipes, comprising a feeding mechanism, a plasticizing mechanism and a pipe forming mechanism, wherein the feeding mechanism at least comprises a hopper, the plasticizing mechanism at least comprises a plasticizing pipe, the pipe forming mechanism at least comprises a fixed mold and a movable mold, the plasticizing pipe is connected to the fixed mold, and the bottom of the hopper is connected to the top of the plasticizing pipe;

[0009] The hopper is used to control the speed at which the plastic raw material falls into the plasticizing tube, the plasticizing tube is used to heat and melt the plastic raw material, and the fixed mold and the movable mold that are closely attached to each other are used to cool and shape the PVC pipe;

[0010] When the plastic raw material in the hopper does not fall into the plasticizing tube, the heat in the plasticizing tube is used to dry the plastic raw material in the hopper, and the plasticizing mechanism can prevent the heat in the hopper from escaping to the outside, and the fixed mold and movable mold separated from each other are used to quickly demold the formed PVC pipe.

[0011] As a further improvement of the technical solution, the unloading mechanism further includes a plurality of check valves and a pair of movable plates, the check valves are located above the movable plates, and a drying chamber is provided between the plurality of check valves and the two movable plates.

[0012] As a further improvement of the present technical solution, each of the movable plates is rotatably connected to the inner wall of the hopper, the outer ring of the movable plate shaft is fixedly connected to a torsion spring, the outer ring of the torsion spring is fixedly connected to a limiting wall, and the side wall of the limiting wall is fixedly connected to the outer wall of the hopper.

[0013] As a further improvement of the technical solution, the height of the two movable plates on the side close to each other is lower than the height of the two movable plates on the side away from each other.

[0014] As a further improvement of the present technical solution, the plasticizing mechanism further comprises an auger rotatably connected to the plasticizing tube, one end of the auger is provided with a motor, the auger is coaxially connected to the output shaft of the motor, and the outer wall of the plasticizing tube is sleeved with a plurality of heating rings.

[0015] As a further improvement of the present technical solution, the pipe forming mechanism further includes a first mold frame and a second mold frame arranged at intervals, a connecting pipe is provided on the first mold frame, one end of the connecting pipe is connected to the plasticizing pipe, and the end of the connecting pipe away from the plasticizing pipe is connected to the cavity of the fixed mold, a movable mold is provided between the second mold frame and the fixed mold, a first hydraulic rod is provided on the second mold frame, a fixed part of the first hydraulic rod is fixedly connected to the second mold frame, and a movable part of the first hydraulic rod is fixedly connected to the movable mold, the first mold frame is provided with a second hydraulic rod on one side of the fixed mold, the fixed part of the second hydraulic rod is fixedly connected to the first mold frame, and a core is fixedly connected to the movable part of the second hydraulic rod.

[0016] As a further improvement of the technical solution, the friction coefficients of the fixed mold and the movable mold are both greater than the friction coefficient of the core.

[0017] The second object of the present invention is to provide a method for a novel extruder with a high product forming rate for manufacturing PVC pipes, comprising the following steps:

[0018] S1. Add plastic raw materials into the hopper. When the amount of plastic raw materials reaches a certain level, the plastic raw materials automatically fall into the plasticizing tube;

[0019] S2, the plastic raw materials falling into the plasticizing tube are heated and melted to gradually become plastic melt. At the same time, the heat in the plasticizing tube dries the plastic raw materials that have not fallen into the plasticizing tube;

[0020] S3. The plastic melt in the plasticizing tube is squeezed into the cavity between the first mold frame and the fixed mold. After the plastic melt is cooled into a PVC pipe, the fixed mold and the movable mold separated from each other enable the PVC pipe to be demolded quickly.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the new extruder with high product forming rate for PVC pipe manufacturing, the feeding speed of plastic raw materials is controlled by the feeding mechanism, and the heat dissipated in the plasticizing mechanism is used to dry the moisture attached to the plastic particles. After the plastic particles fall into the hopper, they gradually gather on the top of the two movable plates. A narrow gap formed between the two movable plates allows the heat in the plasticizing tube to dissipate upward, thereby drying the moisture attached to the plastic particles on the top of the movable plate. When the plastic particles on the top of the movable plate accumulate to a certain amount, the two movable plates are pressed open by the plastic particles, and the plastic particles fall into the plasticizing tube below, thereby realizing the intermittent feeding of plastic raw materials, preventing the wall sticking phenomenon near the interface of the hopper and the plasticizing tube, and affecting the subsequent feeding of plastic particles.

[0023] 2. In the new extruder with a high product forming rate for the manufacture of PVC pipes, the fixed mold, movable mold and core that can be separated from each other are arranged, so that: even if the plastic melt injected into the cavity contains water, and the PVC pipe adheres to the cavity after cooling, the separated fixed mold and movable mold can be easily demolded. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structure of the present invention is three-dimensional Figure 1 ;

[0025] Figure 2 The overall structure of the present invention is three-dimensional Figure 2 ;

[0026] Figure 3 It is a partially cutaway perspective view of the present invention;

[0027] Figure 4 It is a cutaway stereoscopic view of the blanking mechanism of the present invention;

[0028] Figure 5 It is a cutaway front view of the blanking mechanism of the present invention;

[0029] Figure 6 For the present invention Figure 4 Enlarged view of point A in the middle;

[0030] Figure 7 It is a cutaway front view of the plasticizing mechanism of the present invention;

[0031] Figure 8 It is a three-dimensional diagram of the pipe forming mechanism of the present invention.

[0032] The meaning of each number in the figure is:

[0033] 100, feeding mechanism; 110, hopper; 120, check valve; 130, movable plate; 140, limiting wall; 150, torsion spring;

[0034] 200, plasticizing mechanism; 210, plasticizing tube; 220, auger; 230, motor; 240, heating ring;

[0035] 300, pipe forming mechanism; 310, first mold frame; 320, second mold frame; 330, fixed mold; 340, first hydraulic rod; 350, movable mold; 360, second hydraulic rod; 370, core. DETAILED DESCRIPTION

[0036] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] Example 1: In order to prevent the plastic raw material from being discharged too quickly and blocking the heating pipe (plasticizing pipe 210 to be described below), the internal structure of the discharge bin (hopper 110 to be described below) is optimized to achieve intermittent discharge. Figure 1-Figure 3 As shown, the purpose of this embodiment is to provide a new extruder with a high product forming rate for PVC pipe manufacturing, including a feeding mechanism 100, a plasticizing mechanism 200 and a pipe forming mechanism 300, the feeding mechanism 100 at least includes a hopper 110, the plasticizing mechanism 200 at least includes a plasticizing tube 210, the pipe forming mechanism 300 at least includes a fixed mold 330 and a movable mold 350, the plasticizing tube 210 is connected to the fixed mold 330, and the bottom of the hopper 110 is connected to the top of the plasticizing tube 210;

[0040] The hopper 110 is used to control the speed at which the plastic raw material falls into the plasticizing tube 210, the plasticizing tube 210 is used to heat and melt the plastic raw material, and the fixed mold 330 and the movable mold 350 that are closely attached to each other are used to cool and shape the PVC pipe;

[0041] When the plastic raw material in the hopper 110 does not fall into the plasticizing tube 210, the heat in the plasticizing tube 210 is used to dry the plastic raw material in the hopper 110, and the plasticizing mechanism 200 can prevent the heat in the hopper 110 from escaping to the outside, and the fixed mold 330 and the movable mold 350 separated from each other are used to quickly demold the formed PVC pipe.

[0042] Working principle: First, put plastic raw materials into the hopper 110. When the plastic raw materials reach a certain amount, the plastic raw materials automatically fall into the plasticizing tube 210;

[0043] The plastic raw material falling into the plasticizing tube 210 is heated and melted to gradually become a plastic melt. At the same time, the heat in the plasticizing tube 210 dries the plastic raw material that has not fallen into the plasticizing tube 210.

[0044] The plastic melt in the plasticizing tube 210 is squeezed into the cavity between the first mold frame 310 and the fixed mold 330. After the plastic melt is cooled to form a PVC pipe, the fixed mold 330 and the movable mold 350 are separated from each other so that the PVC pipe can be demoulded quickly.

[0045] If the material discharge speed in the hopper 110 is not controlled, the plastic raw material will be blocked at the interface between the hopper 110 and the plasticizing tube 210, causing wall adhesion, which affects the subsequent material discharge rate. In addition, the water contained in the plastic raw material will cause the plastic to form a "glue"-like effect after melting, which increases the adhesion between the PVC pipe and the cavity of the fixed mold 330 and the movable mold 350, affecting the demolding of the PVC pipe after molding. Therefore, the internal structure of the hopper 110 is improved.

[0046] like Figure 4-Figure 6 As shown, the specific structure of the unloading mechanism 100 is further disclosed below. The unloading mechanism 100 also includes a plurality of check valves 120 and a pair of movable plates 130. The check valves 120 are located above the movable plates 130. A drying chamber is provided between the plurality of check valves 120 and the two movable plates 130.

[0047] The improvement lies in that: each movable plate 130 is rotatably connected to the inner wall of the hopper 110, the outer ring of the rotating shaft of the movable plate 130 is fixedly connected to the torsion spring 150, the outer ring of the torsion spring 150 is fixedly connected to the limiting wall 140, and the side wall of the limiting wall 140 is fixedly connected to the outer wall of the hopper 110; the height of the side where the two movable plates 130 are close to each other is lower than the height of the side where the two movable plates 130 are far away from each other.

[0048] It should be noted that after the plastic raw material is added into the hopper 110, it will be intercepted by the two movable plates 130 at first, and then gradually gathered at the top of the two movable plates 130, and under the effect of the deformation resistance of the torsion spring 150, the plastic particles will not fall into the plasticizing tube 210. At the same time, since the two movable plates 130 are slightly inclined, a narrow gap is formed between the two movable plates 130, so that the heat in the plasticizing tube 210 can dissipate upward, and the check valve 120 prevents the heat from dissipating to the hopper. 110, so the temperature in the drying chamber will rise, thereby drying the moisture attached to the plastic particles gathered on the top of the two movable plates 130. When the plastic particles on the top of the two movable plates 130 accumulate to a certain amount, the gravity of the plastic particles is greater than the deformation resistance of the two torsion springs 150, so the two movable plates 130 are pressed open by the plastic particles, and the plastic particles are able to fall into the plasticizing tube 210 below, thereby realizing intermittent feeding of plastic raw materials and preventing the interface between the hopper 110 and the plasticizing tube 210 from being blocked.

[0049] In order to heat and melt the plastic particles into a plastic melt that can be freely shaped, a plasticizing mechanism 200 for melting the plastic raw materials is provided at the bottom of the hopper 110 .

[0050] exist Figure 7 In the figure, the plasticizing mechanism 200 also includes an auger 220 rotatably connected to the plasticizing tube 210, one end of the auger 220 is provided with a motor 230, the auger 220 is coaxially connected to the output shaft of the motor 230, and the outer wall of the plasticizing tube 210 is provided with a plurality of heating rings 240.

[0051] The improvement lies in that after the dried plastic particles fall into the plasticizing tube 210, they are heated and melted by the heating ring 240 (a conventional electric heating coil), and at the same time, the motor 230 drives the auger 220 to rotate. Under the combined effect of the shear force of the auger 220 and the heat generated by the heating ring 240, the plastic in the plasticizing tube 210 gradually turns into a plastic melt, and then the plastic melt is squeezed from the connecting tube into the cavity between the fixed mold 330 and the movable mold 350.

[0052] If the plastic particles are accumulated on the movable plate 130, resulting in an unsatisfactory drying effect of the drying chamber on the plastic particles, or the speed of adding the plastic raw materials into the hopper 110 is too fast, resulting in a short drying time of the plastic particles in the drying chamber, causing some of the plastic particles falling into the plasticizing tube 210 to be accompanied by moisture, which will increase the adhesion between the plastic melt and the cavity, making it difficult to demold the subsequent PVC pipe after molding. Therefore, the material and demolding method of the pipe molding mechanism 300 are optimized.

[0053] Figure 8The demoulding method of the PVC pipe in the pipe forming mechanism 300 is shown, and then the specific structure of the pipe forming mechanism 300 is further disclosed. The pipe forming mechanism 300 also includes a first mold frame 310 and a second mold frame 320 arranged at intervals. The first mold frame 310 is provided with a connecting pipe, one end of which is connected to the plasticizing pipe 210, and the end of the connecting pipe away from the plasticizing pipe 210 is connected to the cavity of the fixed mold 330. A movable mold 350 is provided between the second mold frame 320 and the fixed mold 330. A first hydraulic rod 340 is provided on the second mold frame 320, and the fixed part of the first hydraulic rod 340 is fixedly connected to the second mold frame 320, and the movable part of the first hydraulic rod 340 is fixedly connected to the movable mold 350. The first mold frame 310 is provided with a second hydraulic rod 360 on one side of the fixed mold 330, and the fixed part of the second hydraulic rod 360 is fixedly connected to the first mold frame 310, and the movable part of the second hydraulic rod 360 is fixedly connected to the core 370.

[0054] Furthermore, the friction coefficients of the fixed mold 330 and the movable mold 350 are both greater than the friction coefficient of the core 370 .

[0055] It should be noted that before the plastic melt is extruded, the movable part of the first hydraulic rod 340 pushes the movable mold 350 toward the fixed mold 330 until the two are close to each other, and then the movable part of the second hydraulic rod 360 pushes the core 370 to insert the core 370 into the cavity between the fixed mold 330 and the movable mold 350. Then, the plastic melt in the plasticizing tube 210 is squeezed into the gap between the core 370 and the cavity. After the plastic melt is cooled and formed, the second hydraulic rod 360 retracts the core 370. Since the friction coefficients of the fixed mold 330 and the movable mold 350 are both greater than the friction coefficient of the core 370, the friction force on the outer wall of the plastic part is greater than the friction force on the inner wall. Therefore, the cooled plastic part will stay in the cavity and will not move with the core 370. Then, the movable mold 350 is retracted by the first hydraulic rod 340. Even if the PVC pipe adheres to the inner wall of the cavity due to water in the plastic melt, after the movable mold 350 and the fixed mold 330 are separated from each other, the PVC pipe will only adhere to the inner wall of one of them, thereby facilitating demolding of the PVC pipe after molding.

[0056] Embodiment 2: This embodiment is based on the content provided in Embodiment 1, and aims to provide a method for a new extruder with a high product forming rate for manufacturing PVC pipes, and the specific steps are as follows:

[0057] S1. Put plastic particles into the hopper 110. The plastic particles will be intercepted by the two movable plates 130 at first, and then gradually gathered on the top of the two movable plates 130. Under the deformation resistance of the torsion spring 150, the plastic particles will not fall into the plasticizing tube 210. At the same time, since the two movable plates 130 are slightly inclined, a narrow gap is formed between the two movable plates 130, so that the heat in the plasticizing tube 210 can dissipate upward. At the same time, the check valve 120 prevents the heat from escaping to the outside of the hopper 110. Therefore, the temperature in the drying chamber will increase, thereby drying the moisture attached to the plastic particles gathered on the top of the two movable plates 130. When the plastic particles on the top of the two movable plates 130 accumulate to a certain amount, the gravity of the plastic particles is greater than the deformation resistance of the two torsion springs 150, so the two movable plates 130 are pressed open by the plastic particles, and the plastic particles fall into the plasticizing tube 210 below, thereby realizing intermittent unloading of plastic raw materials;

[0058] S2, the plastic raw material falling into the plasticizing tube 210 is heated and melted to gradually become a plastic melt. Before the plastic melt is squeezed in, the movable part of the first hydraulic rod 340 pushes the movable mold 350 to approach the fixed mold 330 until the two are close to each other, and then the movable part of the second hydraulic rod 360 pushes the core 370 to insert the core 370 into the cavity between the fixed mold 330 and the movable mold 350, and then the plastic melt in the plasticizing tube 210 is squeezed into the gap between the cavity and the core 370 by the rotating auger 220;

[0059] S3. After the plastic melt is cooled and formed, the second hydraulic rod 360 retracts the core 370. Since the friction coefficients of the fixed mold 330 and the movable mold 350 are both greater than the friction coefficient of the core 370, the friction force on the outer wall of the plastic part is greater than the friction force on the inner wall. Therefore, the cooled plastic part will stay in the cavity and will not move with the core 370. Then, the movable mold 350 is retracted by the first hydraulic rod 340. Even if the PVC pipe adheres to the inner wall of the cavity due to water in the plastic melt, after the movable mold 350 and the fixed mold 330 are separated from each other, the PVC pipe will only adhere to the inner wall of one of them, thereby facilitating demolding of the PVC pipe after molding.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A new extruder with a high product forming rate for manufacturing PVC pipes, comprising a feeding mechanism (100), a plasticizing mechanism (200) and a pipe forming mechanism (300), characterized in that: The material discharge mechanism (100) at least comprises a hopper (110), the plasticizing mechanism (200) at least comprises a plasticizing tube (210), the pipe forming mechanism (300) at least comprises a fixed mold (330) and a movable mold (350), the plasticizing tube (210) is connected to the fixed mold (330), and the bottom of the material hopper (110) is connected to the top of the plasticizing tube (210); The hopper (110) is used to control the speed at which the plastic raw material falls into the plasticizing tube (210), the plasticizing tube (210) is used to heat and melt the plastic raw material, and the fixed mold (330) and the movable mold (350) that are closely attached to each other are used to cool and shape the PVC pipe; When the plastic raw material in the hopper (110) does not fall into the plasticizing tube (210), the heat in the plasticizing tube (210) is used to dry the plastic raw material in the hopper (110), and the plasticizing mechanism (200) can prevent the heat in the hopper (110) from escaping to the outside, and the fixed mold (330) and the movable mold (350) separated from each other are used to quickly demould the formed PVC pipe.

2. The novel extruder with high product forming rate for manufacturing PVC pipes according to claim 1 is characterized in that: The unloading mechanism (100) further comprises a plurality of check valves (120) and a pair of movable plates (130), wherein the check valves (120) are located above the movable plates (130), and a drying chamber is provided between the plurality of check valves (120) and the two movable plates (130).

3. The new extruder with high product forming rate for PVC pipe manufacturing according to claim 2 is characterized in that: Each movable plate (130) is rotatably connected to the inner wall of the hopper (110); the outer ring of the rotating shaft of the movable plate (130) is fixedly connected to a torsion spring (150); the outer ring of the torsion spring (150) is fixedly connected to a limiting wall (140); and the side wall of the limiting wall (140) is fixedly connected to the outer wall of the hopper (110).

4. The novel extruder with high product forming rate for manufacturing PVC pipes according to claim 2 is characterized in that: The height of the side where the two movable plates (130) are close to each other is lower than the height of the side where the two movable plates (130) are far away from each other.

5. The novel extruder with high product forming rate for manufacturing PVC pipes according to claim 1 is characterized in that: The plasticizing mechanism (200) further comprises an auger (220) rotatably connected to the plasticizing tube (210), one end of the auger (220) being provided with a motor (230), the auger (220) being coaxially connected to the output shaft of the motor (230), and the outer wall of the plasticizing tube (210) being provided with a plurality of heating rings (240).

6. The novel extruder with high product forming rate for manufacturing PVC pipes according to claim 1 is characterized in that: The pipe forming mechanism (300) further comprises a first mold frame (310) and a second mold frame (320) which are arranged at intervals. A connecting pipe is provided on the first mold frame (310), one end of which is connected to the plasticizing pipe (210), and the end of which is away from the plasticizing pipe (210) is connected to the mold cavity of the fixed mold (330). A movable mold (350) is provided between the second mold frame (320) and the fixed mold (330). A first hydraulic rod (340) is provided on the second mold frame (320), a fixed portion of the first hydraulic rod (340) is fixedly connected to the second mold frame (320), and a movable portion of the first hydraulic rod (340) is fixedly connected to the movable mold (350). The first mold frame (310) is provided with a second hydraulic rod (360) on one side of the fixed mold (330), a fixed portion of the second hydraulic rod (360) is fixedly connected to the first mold frame (310), and a core (370) is fixedly connected to the movable portion of the second hydraulic rod (360).

7. The novel extruder with high product forming rate for manufacturing PVC pipes according to claim 6 is characterized in that: The friction coefficients of the fixed mold (330) and the movable mold (350) are both greater than the friction coefficient of the core (370).

8. A method for using the novel extruder with high product forming rate for manufacturing PVC pipes as claimed in any one of claims 1 to 7, characterized in that: The steps include: S1, adding plastic raw materials into the hopper (110), and when the plastic raw materials reach a certain amount, the plastic raw materials automatically fall into the plasticizing tube (210); S2, the plastic raw material falling into the plasticizing tube (210) is heated and melted to gradually become a plastic melt, and at the same time, the heat in the plasticizing tube (210) dries the plastic raw material that has not fallen into the plasticizing tube (210); S3, the plastic melt in the plasticizing tube (210) is squeezed into the mold cavity between the first mold frame (310) and the fixed mold (330), and after the plastic melt is cooled to form a PVC pipe, the fixed mold (330) and the movable mold (350) are separated from each other so that the PVC pipe can be quickly demolded.

Images