PET (Polyethylene Terephthalate) slice production equipment and production process

Abstract

The invention discloses PET slice production equipment and a production process, and relates to the technical field of plastic processing.The PET slice production equipment comprises an integrated brace cold cutting assembly and a switching net cylinder, the integrated brace cold cutting assembly continuously extrudes a polymer melt into strips, the PET slice production equipment is provided with the switching net cylinder, the switching net cylinder is arranged in a horizontal cylinder, and the horizontal cylinder is provided with a horizontal opening; four screening areas are arranged on the inner wall of the switching net barrel, a back flushing assembly is arranged on the top of the horizontal barrel, only one screening area of the switching net barrel conducts screening action during normal work, and a positioning motor arranged on a rotating shaft of the switching net barrel conducts back flushing when meshes of one screening area of the switching net barrel are blocked. The positioning motor can drive the blocked screening area of the switching net barrel to move to the back flushing assembly for self-cleaning, shutdown is not needed, production interruption caused by manual screen cleaning is avoided, the continuity, the automation level and the production efficiency of equipment are greatly improved, and the cleaning effect of the back flushing assembly on the screening area is rapid.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing, and particularly relates to a PET chip production device and a production process. Background Art

[0002] As an organic polymer compound, PET chip materials can be combined with materials such as plates, foams or granules to manufacture building energy-saving thermal insulation materials, such as PET foam boards, non-woven felts, etc. They have excellent heat preservation, heat resistance and environmental protection. Before preparing these materials, it is necessary to first slice the PET raw material, cool and solidify the polymerized PET melt and cut it into uniform particles, which is beneficial to subsequent processing and forming. The slices are convenient for storage, transportation, metering and drying treatment, and at the same time ensure stable and continuous feeding of the raw materials in processes such as extrusion, foaming and spinning. It is a key step in the transformation from raw materials to functional materials.

[0003] After the PET raw material is sliced and granulated, it needs to enter a screening device to screen out waste particles from normal PET particles. In the prior art, PET slicing devices are usually equipped with vibrating screens for screening materials. However, when the vibrating screen discharges waste particles during the screening process, the principle of screening by vibration force usually slowly releases the vibration force to the waste outlet, and the movement of materials has a certain randomness. Fine particles and light particles may be mis-screened or carried out. The waste particles slide down from the screen to the waste outlet on one side through vibration. If the waste is not cleared in time, it is easy to accumulate near the discharge port, causing blockage or even backflow again, that is, the waste particles that have been screened out re-enter the normal material flow, which will cause the waste particles that have been identified as unqualified to re-mix into the qualified PET chips. Since the waste particles usually have a larger particle size or irregular shape, the overall particle size distribution of the normal materials will become uneven after mixing, reducing the purity of the materials. In the subsequent screening process, the re-mixed waste particles may block the sieve holes, resulting in a decrease in the sorting efficiency of the screen and a deterioration of the screening accuracy. Some particles that should have been removed may not be effectively separated, or the originally qualified chips may be misjudged as waste and removed, further causing waste of raw materials and affecting production stability and product consistency. Summary of the Invention

[0004] The object of the present invention is to solve the problem that ET slicing equipment is usually equipped with a vibrating screen for screening materials. However, during the discharging process of screening waste particles by the vibrating screen, the principle of screening by vibration force usually slowly releases the vibration force to the waste outlet, and the movement of materials has a certain randomness. Fine particles and light particles may be mis-screened or carried out. The waste particles slide down from the screen to the waste outlet on one side through vibration. If the waste is not cleared in time, it is easy to accumulate near the outlet, causing blockage or even material return phenomenon again, that is, the screened waste particles re-enter the normal material flow, which will cause the already identified unqualified waste particles to re-mix into the qualified PET slices. Since the waste particles usually have a larger particle size or irregular shape, the overall particle size distribution of the normal material will become uneven after mixing, reducing the purity of the material. In the subsequent screening process, the re-mixed waste particles may block the sieve holes, resulting in a decrease in the sorting efficiency of the sieve mesh and a deterioration of the screening accuracy. Some particles that should have been removed may not be effectively separated, or the originally qualified slices may be misjudged as waste and removed, further causing waste of raw materials and affecting the production stability and product consistency. Therefore, a PET slice production equipment and production process are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A PET slice production equipment includes an integrated strip cold cutting component and a switching cylinder. The integrated strip cold cutting component continuously extrudes the polymer melt into strips, which are cut into uniform particles after cooling, water removal, and traction. The integrated cold drawing and cold cutting component includes a melt pump, an extrusion die head, and a water cooling box. A cooling and guiding granulation component is arranged inside the water cooling box; the output end of the melt pump is provided with an extrusion die head, the water cooling box is fixedly arranged below the side of the melt pump, a fixed base is fixedly arranged at the bottom of the side of the water cooling box away from the melt pump, the switching cylinder is movably inserted into the horizontal cylinder, a guiding hopper is arranged below the cooling and guiding granulation component in the water cooling box, and the end of the guiding hopper obliquely extends into the switching cylinder. Four screening areas are circularly arranged on the outer wall of the switching cylinder for screening plastic particles and waste particles. An air blowing component for self-cleaning the screening areas is arranged inside the horizontal cylinder of the switching cylinder. The air blowing component includes an air blowing box, a U-shaped pipe, and a in-place air supply component. The in-place air supply component enables the air blowing component to obtain the air source only after the screening area is completely docked with the air blowing box, avoiding waste of the air source; a horizontal column is fixedly arranged at a non-middle position on the side wall of the horizontal cylinder, the end of the horizontal column is rotatably connected to the top of the side of the transverse movement seat, a waste particle self-dumping component is arranged below the horizontal cylinder on the fixed base, and the waste particle self-dumping component regularly dumps the waste particles intercepted by the switching cylinder.

[0007] Optionally, the cooling and guiding granulation assembly includes guiding rollers, traction rollers, and rotary cutting blades. Two transverse columns are rotatably connected to the side of the water cooling box. The outer walls of the transverse columns are fixedly provided with guiding rollers at equal intervals. An avoidance opening is formed in the side of the water cooling box. Edge seats are symmetrically and fixedly provided on the outer side of the avoidance opening. Two groups of traction rollers are rotatably arranged along the vertical direction at equal intervals on the edge seats.

[0008] Optionally, the in-place air supply assembly includes a switching disk, a light-shielding rod, an air supply pipe, and a photoelectric sensor. A sealing ring is fixedly provided in common between the inner wall of the horizontal cylinder and the outer wall of the switching mesh cylinder. A U-shaped pipe is fixedly provided on the side of the horizontal cylinder away from the guiding hopper. One end of the U-shaped pipe is fixedly communicated with a backwashing box. The top of the backwashing box is attached to the inner wall of the switching mesh cylinder. An anti-blowing collection box is fixedly communicated above the backwashing box in the horizontal cylinder. A receiving hopper is fixedly communicated directly below the anti-blowing collection box in the horizontal cylinder. Anti-blowing holes are arranged at equal intervals on the top of the backwashing box. A folded seat is vertically and fixedly provided at one end of the U-shaped pipe away from the U-shaped pipe.

[0009] Optionally, a positioning motor is fixedly provided on the side of the folded seat. The output end of the positioning motor is fixedly connected to the center position on the side of the switching mesh cylinder. The output end of the positioning motor is fixedly provided with a switching disk. A photoelectric sensor is fixedly provided below the folded seat on the U-shaped pipe. Light-shielding rods are circularly arrayed on the outer wall of the switching disk. Docking holes are formed in the side of the switching disk at positions corresponding to the light-shielding rods.

[0010] Optionally, the waste granule self-dumping assembly includes a release screw, an inverted U-shaped frame, a support plate, and a blocking semi-ring. Both ends of the release screw are rotatably connected to the top of the fixed base. One end of the release screw is fixedly connected to the output end of the release motor. The housing of the release motor is fixedly provided on the side of the fixed base.

[0011] Optionally, the bottom of the transverse movement seat is screwed onto the outer wall of the release screw. An inverted U-shaped frame is fixedly provided on the side of the bottom of the receiving hopper away from the horizontal column. Traveling wheels are symmetrically and rotatably connected to the bottom of the inverted U-shaped frame. A waste hopper is formed in the middle position of the top of the fixed base. Support plates are symmetrically and fixedly provided on the top of the waste hopper.

[0012] Optionally, a horizontal plane and an inclined plane are sequentially formed on the top of the support plate. The traveling wheels travel along the top of the horizontal plane or the top of the inclined plane. The top of the blocking semi-ring is fixedly connected to the bottom of the guiding hopper through a vertical rod. The side wall of the blocking semi-ring is attached to the side wall of the switching mesh cylinder.

[0013] Optionally, the rotating shaft of one group of traction rollers is fixedly connected to the output end of the traction motor. The traction motor is fixedly provided on the side of the edge seat. A horizontal folding seat is fixedly provided on the side of the water cooling box at the edge seat. A rotary cutting motor is fixedly provided on the side of the horizontal folding seat. The output end of the rotary cutting motor is fixedly provided with a rotary cutting blade. The diameter of the rotary cutting blade is larger than the transverse length of the traction roller.

[0014] Optionally, an air supply pipe is fixedly arranged above the folding seat and above the positioning motor. The U-shaped pipe is provided with an air inlet hole below the folding seat. The switching disc extends into the gap between the air inlet hole and the air supply pipe.

[0015] Optionally, a solenoid valve is arranged on the side surface of the bottom of the guiding hopper, and a pressure sensor is embedded on the side surface of the blocking semi-ring close to the horizontal cylinder.

[0016] A production process of PET chips, which is used for a PET chip production device according to any one of claims 1-10, includes the following steps:

[0017] S1. PET plastic granulation: Workers put the polymerized melt into the integrated strip cooling and cutting assembly. The integrated strip cooling and cutting assembly continuously extrudes the polymerized melt into strips, which are cut into uniform particles after cooling, water removal, and traction, and are sent into the switching mesh cylinder through the guiding hopper.

[0018] S2. PET particle screening: Any one of the screening areas of the switching mesh cylinder separates waste particles from PET particles. The back-blowing assembly periodically back-blows and cleans the blocked screening area of the switching mesh cylinder. The waste particles are self-dumped by the self-dumping assembly of the switching mesh cylinder.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention is provided with a waste particle self-dumping assembly at the bottom of the horizontal cylinder. When the switching mesh cylinder is screening plastic particles, different from the vibrating screen structure, the blocking semi-ring of the waste material self-dumping assembly will temporarily intercept the waste particles inside the switching mesh cylinder, and the waste particles will not be discharged in advance. When it is necessary to discharge the waste material, the waste material self-dumping assembly can periodically drive the switching mesh cylinder to separate from the blocking semi-ring, and dump the waste particles inside the switching mesh cylinder into an independent storage chamber, realizing the centralized and automatic dumping and discharging of waste particles, improving the waste discharging efficiency. Compared with the vibrating screen equipment, it will not block the waste material discharge port, and to a certain extent, solves the problems of blockage and even material return at the waste material discharge port when the vibrating screen screens PET chips, ensuring the screening efficiency and screening accuracy of the screen to a certain extent, ensuring the quality of the post-treatment of PET chips. Moreover, a pressure sensor is arranged on the side surface of the blocking semi-ring, and a solenoid valve is arranged at the discharge port of the guiding hopper. When the waste material self-dumping assembly periodically drives the switching mesh cylinder to separate from the blocking semi-ring and is about to dump the waste particles inside the switching mesh cylinder, the guiding hopper is made to stop feeding the material to be screened into the screening mesh cylinder, avoiding the mixing of new materials, interfering with the discharging action or causing misclassification during the dumping process, improving the screening accuracy and stability, effectively preventing the blockage of the screening channel and the misoperation of the equipment, and ensuring the coordinated, efficient, and safe operation of the entire automatic screening and waste cleaning process.

[0021] 2. The PET chip equipment of the present invention is provided with a switching cylinder, which is arranged inside the horizontal cylinder. The inner wall of the switching cylinder is provided with four screening zones. The top of the horizontal cylinder is provided with a backwashing component. During normal operation, only one screening zone of the switching cylinder performs the screening action. A positioning motor is arranged on the rotating shaft of the switching cylinder. When the mesh holes of one screening zone of the switching cylinder are blocked, the positioning motor can drive the blocked screening zone of the switching cylinder to move to the backwashing component for self-cleaning, without stopping the machine, avoiding production interruption caused by manual cleaning of the screen, greatly improving the continuity, automation level and production efficiency of the equipment, and the cleaning effect of the screening zone by the backwashing component is rapid.

[0022] 3. The backwashing component of the present invention is based on the principle of an external high-pressure gas source, and one of the core components of the backwashing component is the in-place gas supply component. Only after any screening zone is completely docked with the backwashing component can the backwashing component obtain the gas source, avoiding gas source waste and mis-blowing phenomena, ensuring operation safety at the same time, and improving the backwashing efficiency and gas source utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is Figure 1 a schematic diagram of the structure from another perspective.

[0025] Figure 3 It is a schematic diagram of the cooperation structure of the guiding hopper and the horizontal cylinder.

[0026] Figure 4 It is a schematic diagram of the structure of the guiding hopper and its connecting parts.

[0027] Figure 5 It is a schematic diagram of the structure of the horizontal cylinder and its connecting parts.

[0028] Figure 6 It is Figure 5 a schematic diagram of the structure from another perspective.

[0029] Figure 7 It is Figure 6 a schematic diagram of the half-sectional structure.

[0030] Figure 8 It is Figure 7 a schematic diagram of the enlarged partial structure at A of

[0031] Figure 9 It is a schematic diagram of the structure of the switching cylinder and its connecting parts.

[0032] Figure 10 It is a schematic diagram of the structure of the backwashing component and its connecting parts.

[0033] Figure 11It is a schematic structural diagram of a slicing component.

[0034] Figure 12 It is a schematic structural diagram of a rotary positioning component.

[0035] In the figure: 1. Melt pump; 2. Extrusion die head; 3. Water cooling box; 4. Horizontal column; 41. Guide roller; 5. Traction motor; 51. Traction roller; 6. Edge seat; 7. Avoidance opening; 8. Guide hopper; 81. Solenoid valve; 9. Vertical rod; 10. Blocking semi-ring; 100. Pressure sensor; 11. Horizontal cylinder; 110. Sealing ring; 111. Backflush header; 112. Receiving hopper; 12. Horizontal column; 13. Transverse moving seat; 14. Fixed base; 15. Release motor; 151. Release screw; 16. Positioning motor; 161. Switching disk; 1610. Docking hole; 1611. Light-shielding rod; 17. Inverted U-shaped frame; 18. Walking wheel; 19. Scrap hopper; 20. Horizontal plane; 21. Support plate; 22. Inclined plane; 23. Screening hole; 24. Switching mesh cylinder; 25. Backflush box; 251. Backflush hole; 26. U-shaped pipe; 261. Air inlet hole; 27. Photoelectric sensor; 28. Folded seat; 29. Air supply pipe; 30. Rotary cutting motor; 31. Rotary cutting edge; 32. Horizontal folding seat. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0038] Refer to Figure 1-12, A PET chip production device and production process, including an integrated draw-bar cold cutting component and a switching drum 24. The integrated draw-bar cold cutting component continuously extrudes the polymer melt into strips, which are cut into uniform particles after cooling, water removal, and traction. The integrated cold drawing and cold cutting component includes a melt pump 1, an extrusion die head 2, and a water-cooling box 3. Inside the water-cooling box 3, there is a cooling and guiding granulation component, which includes a guiding roller 41, a traction roller 51, and a rotary cutting blade 31. On the side of the water-cooling box 3, there are two horizontal columns 4 rotatably connected. On the outer wall of the horizontal column 4, guiding rollers 41 are fixedly arranged at equal intervals. On the side of the water-cooling box 3, there is an avoidance opening 7. On the outer side of the avoidance opening 7, edge seats 6 are symmetrically fixedly arranged. Along the vertical direction, two groups of traction rollers 51 are rotatably arranged at equal intervals on the edge seats 6. The rotating shaft of one group of traction rollers 51 is fixedly connected to the output end of the traction motor 5.

[0039] The traction motor 5 is fixedly arranged on the side of the edge seat 6. On the side of the water-cooling box 3, a horizontal folding seat 32 is fixedly arranged on the side of the edge seat 6. On the side of the horizontal folding seat 32, a rotary cutting motor 30 is fixedly arranged. The output end of the rotary cutting motor 30 is fixedly provided with a rotary cutting blade 31. The diameter of the rotary cutting blade 31 is greater than the horizontal length of the traction roller 51. On the outer walls of the traction roller 51 and the guiding roller 41, wheel grooves are arranged at equal intervals to guide the plastic strip extending from the die head to the position of the rotary cutting blade 31. The number of wheel grooves matches the number of extrusion holes of the extrusion die head 2. The melt pump 1 and the extrusion die head 2 are relatively mature devices in the prior art, so their detailed structures are not disclosed in this application document.

[0040] The output end of the melt pump 1 is provided with an extrusion die head 2. Below the side of the melt pump 1, a water-cooling box 3 is fixedly arranged. At the bottom of the side of the water-cooling box 3 away from the melt pump 1, a fixed base 14 is fixedly arranged. When a sufficient amount of cooling water is introduced into the water-cooling box 3, the two groups of guiding rollers 41 will be submerged by the cooling water, and the plastic strip needs to pass through the bottom of the wheel grooves of the two groups of traction rollers 51. The setting height of the traction rollers 51 needs to be higher than that of the traction rollers 51.

[0041] The switching drum 24 is movably inserted into the horizontal cylinder 11. Below the cooling and guiding granulation component of the water-cooling box 3, there is a guiding hopper 8. On the bottom side of the guiding hopper 8, there is a solenoid valve 81. On the side of the blocking semi-ring 10 close to the horizontal cylinder 11, a pressure sensor 100 is inlaid. When the pressure sensor 100 is completely pressed, the side wall of the blocking semi-ring 10 will fit with the side wall of the sealing ring 110.

[0042] The end of the guiding hopper 8 is obliquely extended into the switching drum 24. On the outer wall of the switching drum 24, there are four screening areas arranged in a circular array for screening plastic particles and waste particles. Each screening area consists of several rows of screening holes 23. Inside the horizontal cylinder 11 of the switching drum 24, there is a back-blowing component for self-cleaning the screening area. The back-blowing component includes a back-blowing box 25, a U-shaped pipe 26, and a gas supply component in place. The gas supply component in place enables the back-blowing component to obtain the gas source only after the screening area is completely docked with the back-blowing box 25, avoiding waste of the gas source;

[0043] The in-place air supply assembly includes a switching disk 161, a light-shielding rod 1611, an air supply pipe 29, a photoelectric sensor 27. A sealing ring 110 is fixedly arranged in common between the inner wall of the horizontal cylinder 11 and the outer wall of the switching mesh cylinder 24. A U-shaped pipe 26 is fixedly arranged on the side of the horizontal cylinder 11 away from the guiding hopper 8. One end of the U-shaped pipe 26 is fixedly communicated with a backwashing box 25. The top of the backwashing box 25 fits to the inner wall of the switching mesh cylinder 24. Therefore, the top of the backwashing box 25 is an arc surface. The horizontal cylinder 11 is fixedly communicated with a backwashing header 111 above the backwashing box 25. The horizontal cylinder 11 is fixedly communicated with a receiving hopper 112 directly below the backwashing header 111. The top of the backwashing box 25 is equidistantly provided with backwashing holes 251. A folding seat 28 is vertically and fixedly arranged at one end of the U-shaped pipe 26 away from the U-shaped pipe 26.

[0044] A positioning motor 16 is fixedly arranged on the side of the folding seat 28. The output end of the positioning motor 16 is fixedly connected to the center position of the side of the switching mesh cylinder 24. The output end of the positioning motor 16 is fixedly provided with a switching disk 161. A photoelectric sensor 27 is fixedly arranged below the folding seat 28 on the U-shaped pipe 26. The outer wall of the switching disk 161 is circularly arrayed with light-shielding rods 1611. Docking holes 1610 are opened at the corresponding positions of the light-shielding rods 1611 on the side of the switching disk 161. An air supply pipe 29 is fixedly arranged above the positioning motor 16 on the folding seat 28. An air inlet hole 261 is opened below the folding seat 28 on the U-shaped pipe 26. The switching disk 161 extends into the gap between the air inlet hole 261 and the air supply pipe 29. The number of the light-shielding rods 1611 is set to one, which is used for the positioning motor 16 to determine the actual screening area position.

[0045] A horizontal column 12 is fixedly arranged at a non-middle position on the side wall of the horizontal cylinder 11. The end of the horizontal column 12 is rotatably connected to the top of the side of the transverse movement seat 13. A waste particle self-dumping assembly is arranged below the horizontal cylinder 11 on the fixed base 14. The waste particle self-dumping assembly regularly dumps the waste particles intercepted by the switching mesh cylinder 24. The waste particle self-dumping assembly includes a release screw 151, an inverted U-shaped frame 17, a support plate 21 and a blocking semi-ring 10. Both ends of the release screw 151 are rotatably connected to the top of the fixed base 14. One end of the release screw 151 is fixedly connected to the output end of the release motor 15. The inner diameter of the blocking semi-ring 10 is set to be smaller than the inner diameter of the switching mesh cylinder 24.

[0046] The housing of the release motor 15 is fixedly arranged on the side of the fixed base 14. The bottom of the transverse movement seat 13 is screwed onto the outer wall of the release screw 151. On the side of the bottom of the material receiving hopper 112 away from the horizontal column 12, an inverted U-shaped frame 17 is fixedly arranged. Symmetrically rotatably connected to the bottom of the inverted U-shaped frame 17 are traveling wheels 18. In the middle position of the top of the fixed base 14, a waste hopper 19 is provided. Symmetrically fixedly arranged at the top of the waste hopper 19 are support plates 21. On the top of the support plates 21, a horizontal plane 20 and an inclined plane 22 are successively provided. The traveling wheels 18 travel along the top of the horizontal plane 20 or the top of the inclined plane 22. The top of the blocking semi-ring 10 is fixedly connected to the bottom of the guiding hopper 8 through a vertical rod 9, and the side wall of the blocking semi-ring 10 is attached to the side wall of the switching cylinder 24.

[0047] The specific implementation steps and principles of the present invention are as follows:

[0048] Under normal conditions, the blocking semi-ring 10 is attached to the bottom of the side wall of the closed ring 110, the pressure sensor 100 is triggered, the solenoid valve 81 is opened, and the traveling wheels 18 are at the top of the horizontal plane 20 on the top of the support plate 22.

[0049] The plastic particles generated by the integrated draw bar cold cutting assembly are introduced into the switching cylinder 24 through the inclined guiding hopper 8. The positioning motor 16 intermittently rotates forward and backward by a certain small angle, driving the switching cylinder 24 to intermittently rotate forward and backward. The waste particles are intercepted by the switching cylinder 24, and the normal particles fall into the material receiving hopper 112.

[0050] When it is necessary to perform back blowing and cleaning on a screening area, a screening area of the switching cylinder 24 enters the top of the back blowing box 25. The positioning motor 16 rotates until a light blocking rod 1611 blocks the photoelectric sensor 27. At this time, the docking hole 1611 of the switching disk 161 is communicated with the air inlet hole 261 and the air supply pipe 29, and the back blowing box 25 performs back blowing on the blocked mesh holes of the screening area through high-pressure gas.

[0051] When it is necessary to dump the waste particles, the release motor 15 drives the horizontal cylinder 11 away from the guiding hopper 8 through the release screw 151. At this time, the pressure sensor 100 is released, the solenoid valve 81 is closed, and the guiding hopper 8 stops feeding the material to be screened into the switching cylinder 24. When the traveling wheels 18 move to the bottom of the inclined plane 22, since the horizontal column 12 is installed at a non-central line position of the horizontal cylinder 11, one end of the horizontal cylinder 11 close to the guiding hopper 8 will move downward due to its own weight, and finally the waste particles are poured into the waste hopper 19.

[0052] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A PET slice production equipment, comprising an integrated cold-cutting assembly and a switching net cylinder, characterized in that: The integrated cold-drawing and cold-cutting assembly continuously extrude the polymer melt into strips, and cuts them into uniform particles after cooling, dehydration and pulling. The integrated cold-drawing and cold-cutting assembly includes a melt pump, an extrusion die head and a water cooling box, and a cooling guide granulation assembly is arranged inside the water cooling box; An extrusion die head is provided at the output end of the melt pump, a water cooling box is fixedly provided at the lower side of the melt pump, a fixed base is fixedly provided at the bottom of a side of the water cooling box away from the melt pump, the switching net cylinder is movably inserted into the interior of the horizontal cylinder, a guide bucket is provided at the lower side of the water cooling box for cooling and guiding the granulation assembly, the end of the guide bucket is inclined to extend into the interior of the switching net cylinder, the circular array on the outer wall of the switching net cylinder has four screening areas for screening plastic particles and waste particles, the horizontal cylinder is provided with a back-blowing assembly for self-cleaning the screening area inside the switching net cylinder, the back-blowing assembly includes a back-blowing box, a U-shaped pipe and an in-place air supply assembly, the in-place air supply assembly enables the back-blowing assembly to obtain an air source only after the screening area is completely docked with the back-blowing box, thereby avoiding waste of air source; A horizontal column is fixedly arranged at a non-middle position of the side wall of the horizontal cylinder, and the end of the horizontal column is rotatably connected to the top of the side of the transverse displacement seat. A waste particle self-dumping component is arranged on the fixed base below the horizontal cylinder, and the waste particle self-dumping component will switch the net cylinder to intercept the waste particles for timed dumping.

2. A PET slice production equipment according to claim 1, characterized in that: The cooling guide granulation assembly includes a guide roller, a traction roller, and a rotary cutting blade. The side of the water cooling box is rotatably connected to two transverse columns, and the outer wall of the transverse column is equidistantly fixed with guide rollers. The side of the water cooling box is provided with an escape opening, and the outer side surface of the escape opening is symmetrically fixed with an edge seat, and the edge seat is equidistantly rotatably provided with two groups of traction rollers along the vertical direction.

3. A PET slice production equipment according to claim 1, characterized in that: The in-place air supply assembly includes a switching disk, a light-shielding rod, an air supply pipe, and a photoelectric sensor. A closed ring is fixedly provided between the inner wall of the horizontal cylinder and the outer wall of the switching net cylinder. A U-shaped tube is fixedly provided on the side of the horizontal cylinder away from the guide bucket. One end of the U-shaped tube is fixedly connected to a backblowing box. The top of the backblowing box is attached to the inner wall of the switching net cylinder. The horizontal cylinder is fixedly connected to a backblowing collection box above the backblowing box. The horizontal cylinder is fixedly connected to a receiving hopper just below the backblowing collection box. Backblowing holes are equidistantly provided on the top of the backblowing box. A folding seat is vertically fixedly provided on the end of the U-shaped tube away from the U-shaped tube.

4. A PET slice production equipment according to claim 3, characterized in that: A positioning motor is fixedly arranged on the side of the folding seat, and the output end of the positioning motor is fixedly connected to the center position of the side of the switching net cylinder. A switching disk is fixedly arranged on the output end of the positioning motor. A photoelectric sensor is fixedly arranged on the U-shaped tube below the folding seat. A circular array of shading rods is arranged on the outer wall of the switching disk, and a docking hole is opened on the side of the switching disk at the position corresponding to the shading rod.

5. A PET slice production equipment according to claim 4, characterized in that: The waste particle self-dumping assembly includes a release screw, an inverted U frame, a support plate and a blocking half ring. Both ends of the release screw are rotatably connected to the top of the fixed base, one end of the release screw is fixedly connected to the output end of the release motor, and the release motor housing is fixedly arranged on the side of the fixed base.

6. A PET slice production equipment according to claim 5, characterized in that: The bottom thread of the transverse shift seat is screwed into the outer wall of the release screw, and an inverted U-frame is fixedly arranged on the side of the bottom of the receiving hopper away from the horizontal column. The bottom of the inverted U-frame is symmetrically connected to the walking wheels for rotation. A waste hopper is opened in the middle position of the top of the fixed base, and a support plate is symmetrically fixed on the top of the waste hopper.

7. A PET slice production equipment according to claim 6, characterized in that: The top of the support plate is provided with a horizontal plane and an inclined plane in sequence, the walking wheel walks along the top of the horizontal plane or the top of the inclined plane, the top of the blocking semi-ring is fixedly connected to the bottom of the guide bucket through a vertical rod, and the side wall of the blocking semi-ring is attached to the side wall of the switching net cylinder.

8. A PET slice production equipment according to claim 2, characterized in that: One group of traction roller shafts is fixedly connected to the output end of the traction motor, the traction motor is fixedly arranged on the side of the edge seat, the water cooling box is fixedly provided with a transverse folding seat on the side of the edge seat, the side of the transverse folding seat is fixedly provided with a rotary cutting motor, and the output end of the rotary cutting motor is fixedly provided with a rotary cutting blade, and the diameter of the rotary cutting blade is larger than the horizontal length of the traction roller.

9. A PET slice production equipment according to claim 4, characterized in that: The folding seat is fixedly provided with an air supply pipe above the positioning motor, the U-shaped tube is provided with an air inlet hole below the folding seat, and the switching disk extends into the gap between the air inlet hole and the air supply pipe.

10. The PET slice production equipment according to claim 5, characterized in that: A solenoid valve is arranged on the bottom side of the guide bucket, and a pressure sensor is inlaid on the side of the blocking half ring close to the horizontal cylinder.

11. A PET slice production process, used for a PET slice production device according to any one of claims 1 to 10, characterized in that: The following steps are involved: S1, PET plastic granulation and slicing, workers put the polymer melt into the integrated drawing cold cutting component, the integrated drawing cold cutting component continuously extrude the polymer melt into strips, after cooling, dehydration, traction, cut into uniform particles, and send them into the switching net cylinder through the guide bucket; S2, PET particle screening, switching any screening area of ​​the mesh cylinder to separate the waste particles from the PET particles, the backflush component regularly backflushs and cleans the blocked screening area of ​​the switching mesh cylinder, and the waste particle self-dumping component switches the mesh cylinder to intercept the waste particles for self-dumping.

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