CN114714589A

CN114714589A - Processing method and forming equipment for producing PVC plastic products through extruder

Info

Publication number: CN114714589A
Application number: CN202210359686.8A
Authority: CN
Inventors: 郁秋峰; 郁冯; 陆学明
Original assignee: Zhejiang Wanhui New Material Technology Co ltd
Current assignee: Zhejiang Wanhui New Material Technology Co ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-07-08

Abstract

The invention discloses a processing method and molding equipment for producing PVC plastic products by an extruder, which comprises a box body and a charging barrel, a feed hopper is arranged on one side of the top end of the box body, a stirring cavity for stirring materials is arranged in the box body, heating cavities for keeping the constant temperature of the inner cavity of the box body are arranged on both sides of the stirring cavity, the feed inlet of the charging barrel is communicated with the discharge outlet of the box body, the invention can effectively save energy, realize green production, improve production efficiency in the full-automatic production process, effectively save energy by the cooperation of electromagnetic heating and preheating in the heating cavity, improve heating efficiency, and make up for the defects of slower resistance heating speed, lower efficiency and the like.

Description

Processing method and forming equipment for producing PVC plastic products through extruder

Technical Field

The invention relates to the technical field of plastic production equipment, in particular to a processing method and forming equipment for producing PVC plastic products through an extruder.

Background

With the continuous development and technological innovation of the current extruder equipment in various production application fields, the current extruder market still maintains a rapidly developing situation. It is a fact within the industry that the equipment price of traditional domestic single function extruders has decreased. The competitiveness and the production quality of plastic extruders in China are greatly reduced by malignant price war and rough manufacture of some manufacturers, and the healthy development of the whole plastic processing industry is also greatly limited.

At present, the existing extruder is mostly through resistance heating, and resistance heating speed is slow, and is slow to the melting rate of material, greatly reduced the production efficiency of equipment, also great waste the energy simultaneously, in addition, the existing extruder is mostly directly sent the material into the feed cylinder and is processed, and this kind of mode makes the material all pour into the feed cylinder, is difficult to melt it fast, has further increased the degree of difficulty of melting.

Disclosure of Invention

The object of the present invention is to provide a processing method and a molding apparatus for producing PVC plastic products by means of an extruder, which solve the problems set forth in the background art described above.

In order to achieve the purpose, the invention provides the following technical scheme:

a molding apparatus for producing PVC plastic products by an extruder, comprising:

the device comprises a box body, wherein a feed hopper is arranged on one side of the top end of the box body, a stirring cavity for stirring materials is arranged in the box body, and heating cavities for keeping the inner cavity of the box body constant in temperature are arranged on two sides of the stirring cavity;

the feed inlet of feed cylinder is linked together with the discharge gate of box, just the inner chamber of feed cylinder is provided with the screw rod, the tip of feed cylinder is provided with the die head, just the surface of feed cylinder is provided with electromagnetic heating mechanism.

As a further scheme of the invention: the stirring device is characterized in that a vertically distributed stirring shaft is arranged in the middle of the stirring cavity, the stirring shaft is rotationally connected with the inner wall of the box body through a bearing, the top end of the stirring shaft extends to the upper part of the box body and is connected with a motor, a screen is arranged in the inner cavity of the stirring cavity, three fixing rods distributed in a circumferential array are arranged at the position, above the screen, of the stirring shaft, three stirring blades distributed at equal intervals are arranged on each fixing rod, a spiral extrusion belt is arranged at the position, below the screen, of the stirring shaft, the position, below the screen, of the stirring cavity is of a conical structure, the stirring shaft is rotated by starting the motor, so that the fixing rods drive the stirring blades to stir materials, the materials are enabled to be heated uniformly and not to be adhered to the box body and not to flow downwards, and the resistance of the materials which are relatively hard at the beginning can be relatively large when stirring is carried out, if there is not the interval between the stirring piece, the stirring piece will extrude by force, the atress is very big, cause the damage of stirring piece very easily like this, even the fracture, consequently make three stirring piece equidistant distribution install, stirring piece can cover whole screen cloth plane when not only having ensured to rotate, and the material has been saved, whole quality keeps balanced when the (mixing) shaft operation simultaneously, can not cause excessive wearing and tearing because of taking place the focus skew, thereby prolong its life, a spiral extrusion area is installed to the (mixing) shaft below the screen cloth, its effect is in making the melting material through the screen cloth clearance can flow into the feed cylinder downwards with higher speed under the effect of rotatory extrusion force in, and can not be detained or be stained with on the (mixing) shaft bottom the box.

As a still further scheme of the invention: the fixing rods are distributed in an inclined manner, the stirring plates are made of spring steel plates, the fixing rods are arranged in an inclined manner, so that an included angle is formed between the stirring plates and the plane of the screen, when the stirring shaft rotates, the stirring plates can generate an oblique downward extrusion force on the materials, the force can be decomposed into a horizontal force and a downward pressure when the stirring plates rotate along with the stirring plates, the force can extrude the melted materials downwards through the gaps of the screen and finally flows to the lower part of the box body to enter the charging barrel, the stirring plates can be bent to a certain degree in actual work, the downward extrusion force is increased, the melted materials are extruded downwards through the gaps of the screen more easily, and the stirring plates are made of spring steel plates with better elasticity, so that the stirring plates can be prevented from being broken due to too large resistance and being elastically deformed when stirred under the condition that the materials are more and the materials are not melted, and the pressure is reduced and the material is restored to the original state after the material is melted.

As a still further scheme of the invention: the heating cavity is internally provided with a separation frame which is of a cavity structure, openings are formed in one side and the bottom of the separation frame, a fan is arranged on the outer wall of the heating cavity, fan blades of the fan are positioned in the separation frame, a heating pipe is arranged in the inner cavity of the heating cavity and positioned below the separation frame, in order to ensure the constant temperature in the box body, a temperature sensor is arranged in the box body, heat generated by the heating pipe enters the feeding hole through starting the heating pipe and the fan, partial heat enters the stirring cavity through the bottom of the box body, a gap is formed between the top ends of the two sides of the stirring cavity and the heating cavity, the heat entering the stirring cavity enters the heating cavity again through the gap, and then enters the feeding hopper and the stirring cavity again through the separation frame, so that the reciprocating circulation is realized, and the hot air circulation is favorable for preheating materials entering the box body, the quick melting of the later stage material of being convenient for, when the temperature in the whole box heated required temperature, it was unchangeable at required within range to keep through temperature controller intelligent control box internal temperature, so not only ensure to preheat inside material, also avoided the high temperature to cause some materials to be heated the burning degradation simultaneously, reduced the consumption of the energy simultaneously.

As a still further scheme of the invention: an air guide channel is arranged between the heating cavity and the bottom of the stirring cavity and communicated with the feed inlet and the stirring cavity.

As a still further scheme of the invention: the inner wall of feed cylinder is provided with a plurality of chute feeders that are circumference array and distribute, the chute feeder is the rectangle straight flute of slope, and the feed cylinder can increase the transport of material, because set up one section bush in the reinforced section barrel, and a plurality of recesses have been seted out to this bush inner wall, through setting up a plurality of rectangle straight flutes that are the slope of circumference array and distribute in the feed cylinder, not only make the feed cylinder have better self-cleaning ability, still make the feed cylinder have best conveying ability, more be suitable for large-scale plastics extrusion equipment's production and application.

As a still further scheme of the invention: the electromagnetic heating mechanism comprises a plurality of groups of electromagnetic induction coils which are arranged on the outer wall of the charging barrel and are arranged at equal intervals, a thermocouple is arranged between every two adjacent electromagnetic induction coils, the electromagnetic induction coils are connected with an electromagnetic controller, the electromagnetic heating technology is an important means of a thermal processing technology, the application in the aspect of metal thermal treatment is very mature, the charging barrel is wrapped with an insulating layer, then the electromagnetic induction coils are wound on the insulating layer and connected to the electromagnetic controller, the electromagnetic controller is used for rectifying common low-frequency alternating current (50/60Hz) into direct current, then the direct current is converted into high-frequency alternating current (20-50KHz), the high-frequency alternating current can generate a rapidly-changing alternating magnetic field through the coils, and countless small eddy currents can be generated when magnetic lines in the magnetic field pass through the magnetically conductive charging barrel, the metal charging barrel is enabled to self-heat, then heat is conducted to materials in the charging barrel, the purpose of material melting is achieved, the metal charging barrel is enabled to self-heat through electromagnetic heating, certain heat insulation materials wrap the outside of the charging barrel, heat loss is greatly reduced, heat efficiency is improved, a power saving effect is obvious, and therefore the electromagnetic heating is more energy-saving and efficient than resistance heating, and the metal charging barrel is long in service life and simple to maintain.

As a still further scheme of the invention: the die head comprises a bushing, a die is arranged in the bushing, one end of the die is rotatably connected with a rotating shaft through a bearing, a cutting blade is sleeved on the rotating shaft, a plurality of through holes which are distributed in order are formed in the die, the side wall of the cutting blade is in contact with the outlet end of the through holes, a sprue is arranged at one end, located in the inner cavity of the bushing, of the die, after the molten material is extruded from the extrusion end of the screw rod, the molten material enters the die through the sprue to be extruded and formed, and the cutting blade in contact with the end face of the die is cut into certain uniform particles to be recycled.

The invention also relates to a process for producing PVC plastic articles by means of an extruder, comprising the following steps:

s, feeding the materials into a stirring cavity through a feed hopper, starting a motor to enable a stirring shaft to rotate, driving a stirring sheet to stir the materials, simultaneously starting a fan and a heating pipe to heat the materials in the stirring cavity, extruding the materials into the lower part of a screen through a screen by the stirring sheet, and feeding the materials into a charging barrel through a feed inlet by a spiral extrusion belt;

s, a motor for driving a screw rod is started, so that the material entering a material barrel is conveyed to one end of a die head under the action of the screw rod, and an electromagnetic controller is started, so that the material barrel is heated to melt the material;

s, the melted materials enter the die head, enter the through hole through the spreader cone, the motor connected with the rotating shaft is started, and the rotating shaft drives the cutting blade to rotate, so that cutting is completed, and the plastic is prepared.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention can effectively save energy, realize green and environment-friendly production, improve the production efficiency in the full-automatic production process, effectively save energy by the cooperation of electromagnetic heating and preheating in the heating cavity, improve the heating efficiency, make up the defects of lower resistance heating speed, lower efficiency and the like, lead the device to preheat materials by the arrangement of the heating cavity, realize hot air circulation, be favorable for saving energy, be convenient for quickly melting the materials in the later period, be favorable for improving the production efficiency of equipment, lead the stirring sheets to uniformly stir the materials under the action of the stirring shaft, ensure that the materials can be uniformly heated and can not be adhered in the box body and can not flow downwards, lead the three stirring sheets to be arranged at equal intervals, not only ensure that the stirring sheets can cover the whole screen plane during rotation, but also save the materials, whole quality is balanced when the (mixing) shaft moves simultaneously, can not cause excessive wearing and tearing because of taking place the focus skew to prolong its life, a screw extrusion area is installed to the (mixing) shaft below the screen cloth, and its effect is in making the melting material through the screen cloth clearance can flow into the feed cylinder downwards with higher speed under the effect of rotatory extrusion force, and can not be detained or be stained with glutinous on the (mixing) shaft bottom the box.

2. Through setting up the dead lever slope, make stirring piece and the plane of screen cloth be an contained angle, stirring piece has a decurrent extrusion force to the material when the (mixing) shaft is rotatory, this power can be decomposed into horizontal force and decurrent pressure when rotatory along with stirring piece, this power can be with the clearance of the material extrusion downwards through the screen cloth of melting, flow into the box lower part at last and get into in the feed cylinder, the bending of certain degree can take place for stirring piece in the actual work, decurrent extrusion force has been strengthened, make the material after the melting more easily extruded down through the screen cloth clearance, make stirring piece through the better spring steel sheet of adoption elasticity, can ensure like this that the material is when more and not have under the fused condition, the stirring piece can not take place the rupture because of the resistance is too big when the stirring, but elastic deformation, treat that material melting back pressure diminishes and the reconversion.

3. The feed cylinder can increase the transport of material, because set up one section bush in the section barrel that adds the material, and a plurality of recesses are opened to this bush inner wall, through set up the rectangle straight flute that a plurality of slopes that are circumference array and distribute in the feed cylinder, not only make the feed cylinder have better self-cleaning ability, still make the feed cylinder have best conveying ability, more be suitable for large-scale plastics extrusion equipment's production and application.

4. The electromagnetic heating is to make the metal charging barrel self-heating, and wrap up certain thermal-insulated insulation material outside the charging barrel, greatly reduce the thermal loss, raise the thermal efficiency, the electricity-saving effect is apparent, therefore, the electromagnetic heating is more energy-conserving, high-efficient than resistance heating, and long service life, it is simple to maintain.

Drawings

Fig. 1 is a schematic structural diagram of a molding device for producing PVC plastic products by an extruder.

FIG. 2 is a schematic view showing the structure of a stirring shaft in a molding apparatus for producing PVC plastic products by an extruder.

FIG. 3 is a connection diagram of a screw and a barrel in a molding apparatus for producing PVC plastic products by an extruder.

Fig. 4 is a schematic structural diagram of a charging barrel in the forming device for producing PVC plastic products through an extruder.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is a schematic structural view of a die in a molding apparatus for producing PVC plastic articles by an extruder.

In the figure: 1. a box body; 2. a feed hopper; 3. a stirring chamber; 4. a heating cavity; 5. a motor; 6. a stirring shaft; 7. fixing the rod; 8. a stirring sheet; 9. screening a screen; 10. spirally extruding the strip; 11. a separation frame; 12. a fan; 13. heating a tube; 15. an air guide duct; 16. a charging barrel; 17. a feed inlet; 18. an electromagnetic induction coil; 19. a thermocouple; 20. an electromagnetic controller; 21. a die head; 22. a screw; 23. a feed chute; 24. a bushing; 25. a spreader cone; 26. a rotating shaft; 27. a cutting blade; 28. a neck ring mold; 29. and a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 6, in the embodiment of the present invention, a molding apparatus for producing PVC plastic products by an extruder includes a box 1 and a charging barrel 16, a feeding hopper 2 is disposed on one side of a top end of the box 1, a stirring chamber 3 for stirring materials is disposed in the box 1, heating chambers 4 for keeping a constant temperature of an inner chamber of the box 1 are disposed on both sides of the stirring chamber 3, a vertically distributed stirring shaft 6 is disposed in a middle portion of the stirring chamber 3, the stirring shaft 6 is rotatably connected to an inner wall of the box 1 through a bearing, a top end of the stirring shaft 6 extends to a position above the box 1 and is connected to a motor 5, a screen 9 is disposed in the inner chamber of the stirring chamber 3, three fixing rods 7 distributed in a circumferential array are disposed above the screen 9 on the stirring shaft 6, three stirring blades 8 distributed at equal intervals are mounted on each fixing rod 7, and a spiral extrusion belt 10 is disposed below the stirring shaft 6, the stirring cavity 3 is arranged below the screen 9 and is provided with a conical structure, the stirring shaft 6 is rotated by starting the motor 5, so that the fixed rod 7 drives the stirring blades 8 to stir the materials, the materials are ensured to be heated uniformly and not to be adhered in the box body 1 and not to flow downwards, the resistance to the materials which are hard at the beginning is larger when stirring is carried out, if no interval exists between the stirring blades 8, the stirring blades 8 are extruded forcibly, the stress is large, the stirring blades 8 are easily damaged and even broken, therefore, the three stirring blades 8 are arranged at equal intervals, the stirring blades 8 can cover the whole screen 9 plane when rotating is ensured, the materials are saved, the whole quality of the stirring shaft 6 is kept balanced when in operation, excessive abrasion caused by gravity center offset is avoided, the service life of the stirring shaft 6 is prolonged, the stirring shaft 6 is provided with a spiral extrusion belt 10 below the screen 9, the stirring mechanism has the effects that molten materials passing through gaps of the screen meshes 9 can flow downwards into the charging barrel 16 at an accelerated speed under the action of rotating extrusion force, the molten materials cannot be detained at the bottom of the box body 1 or adhered to the stirring shaft 6, the fixing rods 7 are distributed in an inclined manner, the stirring sheets 8 are made of spring steel sheets, the fixing rods 7 are arranged in an inclined manner, so that an included angle is formed between the stirring sheets 8 and the plane of the screen meshes 9, the stirring sheets 8 have an inclined downward extrusion force on the materials when the stirring shaft 6 rotates, the force can be decomposed into horizontal force and downward pressure when the stirring sheets 8 rotate, the molten materials can be extruded downwards through the gaps of the screen meshes 9 and finally flow into the charging barrel 16 towards the lower part of the box body, the stirring sheets 8 can be bent to a certain degree in actual work, the downward extrusion force is increased, and the molten materials are extruded downwards through the gaps of the screen meshes 9 more easily, the stirring sheet 8 is made of the spring steel sheet with better elasticity, so that the stirring sheet 8 can not be broken due to too large resistance during stirring but elastically deformed under the condition that materials are more and are not melted, and the pressure is reduced and the materials are restored to the original state after being melted;

a separation frame 11 is arranged in the heating cavity 4, the separation frame 11 is a cavity structure, openings are arranged on one side and the bottom of the separation frame 11, a fan 12 is arranged on the outer wall of the heating cavity 4, fan blades of the fan 12 are positioned in the separation frame 11, a heating pipe 13 is arranged in the heating cavity 4 and below the separation frame 11, an air guide channel 15 is arranged between the heating cavity 4 and the bottom of the stirring cavity 3, the air guide channel 15 is communicated with a feed inlet 17 and the stirring cavity 3, in order to ensure the constant temperature in the box body 1, a temperature sensor is arranged in the box body 1, heat generated by the heating pipe 13 enters the feed inlet 17 through the air guide channel 15 and partial heat enters the stirring cavity 3 through the bottom of the box body 1 by starting the heating pipe 13 and the fan 12, gaps are arranged between the top ends of two sides of the stirring cavity 3 and the heating cavity 4, and the heat entering the stirring cavity 3 enters the heating cavity 4 again through the gaps, the materials enter the air guide duct 15 again through the partition frame 11, and the circulation is performed in a reciprocating manner, so that hot air circulation is realized, the preheating of the materials entering the box body 1 is facilitated, the rapid melting of the materials in the later period is facilitated, when the temperature in the whole box body 1 is heated to the required temperature, the temperature in the box body 1 is intelligently controlled to be kept within the required range through the temperature controller, the preheating of the internal materials is ensured, the thermal combustion degradation of some materials caused by overhigh temperature is avoided, and the energy consumption is reduced;

the feed inlet 17 of the charging barrel 16 is communicated with the discharge outlet of the box body 1, the inner cavity of the charging barrel 16 is provided with a screw 22, the end part of the charging barrel 16 is provided with a die head 21, the surface of the charging barrel 16 is provided with an electromagnetic heating mechanism, the inner wall of the charging barrel 16 is provided with a plurality of feeding grooves 23 distributed in a circumferential array, the feeding grooves 23 are inclined rectangular straight grooves, the charging barrel 16 can increase the conveying of materials, because a section of lining is arranged in the charging section of the charging barrel, and the inner wall of the lining is provided with a plurality of grooves, the charging barrel 16 is provided with a plurality of inclined rectangular straight grooves distributed in a circumferential array, the charging barrel 16 not only has better self-cleaning capability, but also has the best conveying capability, and is more suitable for the production and application of large-scale plastic extrusion equipment, the electromagnetic heating mechanism comprises a plurality of groups of electromagnetic induction coils 18 which are arranged on the outer wall of the charging barrel 16 at equal intervals, and a thermocouple 19 is arranged between every two adjacent electromagnetic induction coils 18, the electromagnetic induction coil 18 is connected with an electromagnetic controller 20, the electromagnetic heating technology is an important means of the heat processing technology, the application in the aspect of metal heat treatment is very mature, an insulating heat-insulating layer is wrapped on the charging barrel 16, then the electromagnetic induction coil 18 is wound on the heat-insulating layer, the electromagnetic induction coil 18 is connected onto the electromagnetic controller 20, the electromagnetic controller 20 is used for rectifying common low-frequency alternating current (50/60Hz) into direct current, the direct current is converted into high-frequency alternating current (20-50KHz), the high-frequency alternating current can generate a rapidly-changing alternating magnetic field through the coil, countless small eddy currents can be generated when magnetic lines of force in the magnetic field pass through the magnetic conductive charging barrel, so that the metal charging barrel self-heats, then the heat is conducted to materials in the charging barrel 16, the purpose of material melting is achieved, the electromagnetic heating is that the metal charging barrel self-heats, a certain heat insulation material is wrapped outside the charging barrel 16, so that heat loss is greatly reduced, the heat efficiency is improved, the electricity-saving effect is obvious, and therefore, electromagnetic heating is more energy-saving and efficient than resistance heating, the service life is long, and the maintenance is simple;

the die head 21 comprises a lining 24, a die 28 is arranged in the lining 24, one end of the die 28 is rotatably connected with a rotating shaft 26 through a bearing, a cutting blade 27 is sleeved on the rotating shaft 26, a plurality of through holes 29 which are distributed in order are formed in the die 28, the side wall of the cutting blade 27 is in contact with the outlet ends of the through holes 29, a sprue 25 is arranged at one end, located in the inner cavity of the lining 24, of the die 28, after a molten material is extruded from the extrusion end of the screw 22, the molten material enters the die 28 through the sprue 25 to be extruded and formed in an extrusion mode, and the cutting blade 27 in contact with the end face of the die 28 is cut into certain uniform particles to be recycled.

s101, feeding materials into a stirring cavity 3 through a feed hopper 2, starting a motor 5 to enable a stirring shaft 6 to rotate, driving a stirring sheet 8 to stir the materials, simultaneously starting a fan 12 and a heating pipe 13 to heat the stirring cavity 3, extruding the materials into the lower part of a screen 9 through the screen 9 by the stirring sheet 8, and feeding the materials into a charging barrel 16 through a feeding hole 17 through a spiral extrusion belt 10;

s201, by starting a motor for driving a screw 22, the material entering a material barrel 16 is conveyed to one end of a die head 21 under the action of the screw 22, and an electromagnetic controller 20 is started, so that the material barrel 16 is heated to melt the material;

s301, the melted material enters the die head 21, enters the through hole 29 through the spreader cone 25, the motor connected with the rotating shaft 26 is started, the rotating shaft 26 drives the cutting blade 27 to rotate, cutting is completed, and the plastic is manufactured.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A molding apparatus for producing PVC plastic products by an extruder, comprising:

the device comprises a box body (1), wherein a feed hopper (2) is arranged on one side of the top end of the box body (1), a stirring cavity (3) for stirring materials is arranged in the box body (1), and heating cavities (4) for keeping the inner cavity of the box body (1) constant in temperature are arranged on two sides of the stirring cavity (3);

the feeding device comprises a charging barrel (16), wherein a feeding hole (17) of the charging barrel (16) is communicated with a discharging hole of a box body (1), a screw rod (22) is arranged in an inner cavity of the charging barrel (16), a die head (21) is arranged at the end part of the charging barrel (16), and an electromagnetic heating mechanism is arranged on the surface of the charging barrel (16).

2. A molding apparatus for producing PVC plastic products by an extruder according to claim 1, it is characterized in that a vertically distributed stirring shaft (6) is arranged in the middle part in the stirring cavity (3), the stirring shaft (6) is rotationally connected with the inner wall of the box body (1) through a bearing, the top end of the stirring shaft (6) extends to the upper part of the box body (1) and is connected with a motor (5), the inner cavity of the stirring cavity (3) is provided with a screen (9), the stirring shaft (6) is provided with three fixing rods (7) distributed in a circumferential array manner at the position above the screen (9), each fixing rod (7) is provided with three stirring blades (8) distributed at equal intervals, and a spiral extrusion belt (10) is arranged at the lower part of the stirring shaft (6) positioned on the screen (9), the stirring cavity (3) is arranged below the screen (9) and is of a conical structure.

3. A forming apparatus for PVC plastic products produced by extruder as claimed in claim 2, characterized in that said fixing rods (7) are distributed in an inclined shape and said stirring plate (8) is made of spring steel plate.

4. The forming device for producing PVC plastic products by an extruder according to claim 1, wherein a separation frame (11) is arranged in the heating chamber (4), the separation frame (11) is a cavity structure, an opening is arranged at one side and at the bottom of the separation frame (11), a fan (12) is arranged on the outer wall of the heating chamber (4), the fan blade of the fan (12) is positioned inside the separation frame (11), and a heating pipe (13) is arranged in the inner cavity of the heating chamber (4) below the separation frame (11).

5. The forming equipment for producing PVC plastic products through an extruder according to claim 1, wherein an air guide channel (15) is arranged between the heating cavity (4) and the bottom of the stirring cavity (3), and the air guide channel (15) is communicated with the feeding hole (17) and the stirring cavity (3).

6. A forming apparatus for PVC plastic products by extruder according to claim 1, characterized in that the inner wall of the barrel (16) is provided with a plurality of feeding grooves (23) distributed in a circumferential array, and the feeding grooves (23) are inclined rectangular straight grooves.

7. The forming equipment for producing PVC plastic products through an extruder according to claim 1, wherein the electromagnetic heating mechanism comprises a plurality of groups of electromagnetic induction coils (18) which are arranged on the outer wall of the charging barrel (16) and are spaced at equal intervals, a thermocouple (19) is arranged between every two adjacent electromagnetic induction coils (18), and an electromagnetic controller (20) is connected with the electromagnetic induction coils (18).

8. The forming device for producing PVC plastic products through an extruder is characterized in that the die head (21) comprises a bushing (24), a die (28) is arranged in the bushing (24), one end of the die (28) is rotatably connected with a rotating shaft (26) through a bearing, a cutting blade (27) is sleeved on the rotating shaft (26), a plurality of through holes (29) which are distributed in order are formed in the die (28), the side wall of the cutting blade (27) is in contact with the outlet ends of the through holes (29), and a shunting cone (25) is arranged at one end of the die (28) positioned in the inner cavity of the bushing (24).

9. A process for the production of PVC plastic articles by means of an extruder, characterized in that it comprises the following steps:

s101, feeding materials into a stirring cavity (3) through a feed hopper (2), starting a motor (5) to enable a stirring shaft (6) to rotate to drive a stirring sheet (8) to stir the materials, simultaneously starting a fan (12) and a heating pipe (13) to heat the interior of the stirring cavity (3), extruding the materials into the lower portion of a screen (9) through the screen (9) by the stirring sheet (8), and feeding the materials into a charging barrel (16) through a feed inlet (17) through a spiral extrusion belt (10);

s201, a motor for driving a screw rod (22) is started, so that a material entering a material barrel (16) is conveyed to one end of a die head (21) under the action of the screw rod (22), and an electromagnetic controller (20) is started, so that the material barrel (16) is heated to melt the material;

s301, enabling the melted materials to enter a die head (21), enabling the melted materials to enter a through hole (29) through a spreader cone (25), starting a motor connected with a rotating shaft (26), enabling the rotating shaft (26) to drive a cutting blade (27) to rotate, completing cutting, and obtaining the plastic.