Injection molding pipe twin-screw extrusion molding machine and injection molding pipe production process

Abstract

The invention relates to the technical field of double-screw extrusion equipment, in particular to an injection molding pipe double-screw extrusion molding machine and an injection molding pipe production process. Comprising a base, and a driving box is mounted at the top of the base. According to the device, through the arrangement of the first treatment cavity, the second treatment cavity, the gas conveying pipe and the hollow disc, gas can firstly make contact with a reaction solution to separate hydrogen chloride and then make contact with activated carbon to separate vinyl chloride monomers and dioxin, and then the situation that the removal efficiency is affected due to interference generated by unified filtration is avoided; meanwhile, a hollow disc and activated carbon can move circularly through a servo motor, the hollow disc rotates to enable gas to be in contact with reaction solutions at different positions through air holes, the activated carbon can also move circularly to be in contact with the gas at different positions, and meanwhile, an annular plate and the air holes are matched to enable the gas to be shunted so as to be uniformly diffused; therefore, the gas is fully contacted with the reaction solution and the activated carbon, and the filtering effect is prevented from being influenced by local contact filtering.

Description

Technical Field

[0001] The present invention relates to the technical field of twin-screw extrusion equipment, and specifically relates to an injection pipe twin-screw extrusion molding machine and an injection pipe production process. Background Art

[0002] Currently, most plastics are processed on extrusion machines, which can be divided into single-screw and twin-screw extrusion machines. Among them, the twin-screw extrusion machine is developed on the basis of the single-screw extrusion machine. Usually, two screws are closely meshed and rotate in opposite directions to push, heat, and extrude the raw materials into a molded shape.

[0003] In the existing twin-screw extrusion molding machine, two screws (co-rotating / counter-rotating) rotate in the barrel to convey the material from the hopper to the die head. At the same time, when the screws rotate, the material is evenly dispersed through compression and the shearing and mixing effects of structures such as kneading blocks, and volatile substances are removed. Finally, it is extruded through the die head to form a shape. However, when plastic particles are heated and melted, toxic gases such as hydrogen chloride (HCl), vinyl chloride monomer (VCM), and dioxins (PCDD / Fs) are easily generated. If these gases are not adsorbed and filtered in time, they will not only pose a serious threat to the physical health of operators, but also may pollute the surrounding environment. There is also an automatic feeding device for an FEP granulation twin-screw extrusion machine disclosed in the utility model patent with the publication number CN208290429U, which filters toxic gases through an adsorption pad. However, hydrogen chloride (HCl) is a polar molecule, and vinyl chloride monomer (VCM) and dioxins (PCDD / Fs) are non-polar organic substances. The adsorption capacity of unmodified activated carbon for hydrogen chloride is extremely weak, and alkali-modified activated carbon will cause a decrease in the adsorption capacity for vinyl chloride monomer and dioxins, affecting the removal efficiency. Moreover, the gas only flows in a local position of the adsorption pad and is difficult to contact other positions of the adsorption pad, which easily affects the purification efficiency and is not convenient to use. Summary of the Invention

[0004] Based on this, in order to solve the problems of the existing technology, it is necessary to provide an injection pipe twin-screw extrusion molding machine and an injection pipe production process.

[0005] To solve the problems of the existing technology, the technical solution adopted by the present invention is: an injection pipe twin-screw extrusion molding machine, including a base, a drive box is installed on the top of the base, a screw column is rotationally installed on the side of the drive box through a gear set, an extrusion barrel is installed on the side of the drive box, a feed hopper and an extrusion head are respectively installed on the top and side of the extrusion barrel, a heater is fixed on the extrusion barrel, and a gas treatment mechanism is arranged on the base; The gas treatment mechanism includes a treatment box installed on the top of the base. A first treatment chamber and a second treatment chamber which are connected in sequence from bottom to top are provided in the treatment box. A hollow disk and two sector-shaped shells are respectively arranged in the first treatment chamber and the second treatment chamber. Activated carbon is fixedly arranged on both of the two sector-shaped shells. An annular plate is installed in the second treatment chamber. A plurality of air-permeable holes are formed in both the hollow disk and the annular plate. A driving air inlet component for rotating the hollow disk and the two sector-shaped shells is arranged on the base.

[0006] Further, the driving air inlet component includes an installation hole formed in the top of the hollow disk. An air delivery pipe is installed on the installation hole. The two sector-shaped shells are fixedly connected to the air delivery pipe through a fixing unit. The top of the air delivery pipe extends outside the treatment box and is installed with a rotary joint. An exhaust port is arranged at the bottom of the treatment box. A first fan and a second fan are installed on the top of the treatment box. An air outlet and an air inlet are formed in the top of the extrusion barrel. The inlet end and the outlet end of the first fan are respectively installed with an air inlet pipe and a first air pipe. The other ends of the air inlet pipe and the first air pipe are respectively communicated with the air outlet and the rotary joint. The inlet end and the outlet end of the second fan are respectively installed with a second air pipe and an air outlet pipe. The second air pipe and the air outlet pipe are respectively communicated with the exhaust port and the air inlet. Filters are installed in both the air outlet and the air inlet. A driving hole is formed in the bottom of the treatment box. A sleeve is rotatably installed on the driving hole. Two L-shaped plates are installed outside the sleeve. Cutting knives are installed on the tops of the two L-shaped plates. A movable rod is rotatably installed in the sleeve. The hollow disk is installed on the top end of the movable rod. A driving unit for rotating the movable rod and the sleeve is arranged on the base.

[0007] Further, the driving unit includes a servo motor installed on the side of the base. An installation groove is formed in the top of the base. A rotating shaft is rotatably installed in the installation groove. One end of the rotating shaft is connected to the output shaft of the servo motor. A reciprocating thread sleeve is sleeved on the rotating shaft. A moving seat is threadedly sleeved on the reciprocating thread sleeve. A first rack and a second rack are installed on the side of the moving seat. The bottom end of the movable rod extends outside the sleeve and is installed with a first gear. The first gear meshes with the first rack. A second gear is installed at the bottom end of the sleeve. The first gear and the second gear respectively mesh with the first rack and the second rack. A degassing element adapted to the extrusion barrel is arranged on the base. The degassing element is cooperatively installed with the rotating shaft.

[0008] Further, a guide rod is installed in the installation groove. The moving seat is slidably connected to the guide rod.

[0009] Further, the number of teeth of the first gear is greater than that of the second gear.

[0010] Further, the degassing element includes a turntable installed at one end of the rotating shaft. An eccentric shaft is eccentrically installed on the side of the turntable. A connecting rod is rotatably sleeved on the eccentric shaft. A telescopic rod is installed on the top of the base. A lifting block is installed at the end of the telescopic rod. The other end of the connecting rod is rotatably installed at the bottom of the lifting block. A lifting plate is installed on the side of the lifting block. A plurality of insertion rods are installed at the bottom of the lifting plate. A plurality of insertion holes are formed at the top of the extrusion barrel. Fixing tubes adapted to the insertion rods are installed on the plurality of insertion holes.

[0011] Further, the fixing unit includes a sector-shaped block installed on the outer wall of the air delivery pipe. Two moving chambers are formed in the sector-shaped block. Sliding blocks are slidably installed in the two moving chambers. Moving rods and locking blocks are respectively installed on the two sides of the two sliding blocks away from each other. The other ends of the two moving rods both extend outside the sector-shaped block and are installed with pull plates. Limiting plates are installed at the bottoms of the two sector-shaped shells. Two limiting grooves communicating with the moving chambers are formed at the top of the sector-shaped block. Card slots are formed on the sides of the two limiting plates. Springs are installed on the sides of the two sliding blocks. The other ends of the two springs are respectively installed on the inner walls of the sides of the two moving chambers.

[0012] Further, a partition plate is installed on the inner wall of the side of the first treatment chamber. A flow hole is formed in the middle of the partition plate. A mesh demister is installed in the flow hole.

[0013] Further, a sealing door is hingedly installed on the side of the treatment box. A drain pipe communicating with the first treatment chamber is fixedly provided at the bottom of the treatment box. A valve is fixedly provided on the drain pipe.

[0014] An injection pipe production process of the above-mentioned injection pipe twin-screw extrusion molding machine includes the following steps: S1: Before use, pour raw materials and reaction solutions into the feed hopper and the treatment box respectively. After the raw materials enter the feed hopper, they will enter the inside of the extrusion barrel under the action of gravity. Then, the screw column is rotated through the drive box, and the raw materials are pushed forward. During this process, the heater on the extrusion barrel performs gradient heating on the raw materials, and finally, they are evenly extruded through the forming flow channel of the extrusion head, so as to be extruded into shape; S2: The gas in the extrusion barrel is sent into the hollow disk, discharged from the plurality of air permeation holes on the hollow disk and contacts the reaction solution. At this time, the reaction solution reacts with hydrogen chloride, and then the gas with moisture removed will continue to move and contact the activated carbon. The activated carbon adsorbs and filters vinyl chloride monomer and dioxin in the gas, and the adsorbed gas is sent into the extrusion barrel again; S4: The hollow disk rotates, enabling the gas to contact the reaction solution at different positions. Then, the ascending gas is first blocked by the annular plate and then dispersed and moves upward through the air-permeable holes, allowing the gas to diffuse evenly.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: Firstly: By setting up the first treatment chamber, the second treatment chamber, the air delivery pipe, and the hollow disk, the gas can first contact the reaction solution to separate hydrogen chloride, and then contact the activated carbon to separate vinyl chloride monomers and dioxins. This can avoid interference caused by unified filtration and affect the removal efficiency. At the same time, the hollow disk can be rotated and the activated carbon can move in a circular motion through the servo motor. The rotation of the hollow disk enables the gas to contact the reaction solution at different positions through the air-permeable holes, and the activated carbon also moves in a circular motion to contact the gas at different positions. Meanwhile, the annular plate and the air-permeable holes can be used to split the gas and make it diffuse evenly, so that the gas can fully contact the reaction solution and the activated carbon, avoiding local contact filtration and affecting the filtration effect. Secondly: By setting up the servo motor, the second rack, the second gear, the sleeve, and the L-shaped plate, the cutting knife can rotate in a circular motion. The circular motion of the cutting knife cuts the bubbles, thereby refining the bubble size and increasing the gas-liquid contact area, effectively improving the reaction efficiency and strengthening the separation effect. At the same time, through the diameter ratio of the first gear and the second gear, the rotation speed of the cutting knife can be made greater than the rotation speed of the hollow disk, thus avoiding the cutting knife being too slow or rotating synchronously with the hollow disk and affecting the cutting effect. By setting up the partition plate 46, the flow holes, the mesh demister, and the heat-conducting sheet, the moisture in the gas can be effectively removed, avoiding affecting the activated carbon. Thirdly: By setting up the turntable, the eccentric shaft, the connecting rod, the telescopic rod, the lifting block, and the lifting plate, the insertion rod can move up and down while the servo motor outputs. The up-and-down movement of the insertion rod will continuously insert the molten raw material in the extrusion barrel under the action of the fixed pipe 15, thereby causing the bubbles wrapped in the melt to burst. Then, the shear effect of the melt flow is used to make the gas escape, thus avoiding affecting the product quality due to bubble inclusion. Description of the Drawings

[0016] Figure 1 is the three-dimensional structural schematic diagram from the first perspective in the embodiment; Figure 2 is the three-dimensional structural schematic diagram from the second perspective in the embodiment; Figure 3 is Figure 2 the enlarged view of the structure at A in Figure 4 is the three-dimensional structural schematic diagram of the partial section of the extrusion barrel and the treatment box in the embodiment; Figure 5 is Figure 4Enlarged view of the structure at B in [Chinese text]; Figure 6 It is a three-dimensional structure schematic diagram of the partial section of the base and the processing box in the embodiment; Figure 7 It is a three-dimensional structure schematic diagram of the partial section of the processing box in the embodiment; Figure 8 It is Figure 7 Enlarged view of the structure at C in [Chinese text]; Figure 9 It is an enlarged structure schematic diagram of the partial section of the semi-circular block and the sector-shaped housing in the embodiment.

[0017] The reference numerals in the figure are: 1, base; 2, extrusion barrel; 3, drive box; 4, servo motor; 5, processing box; 6, sealing door; 7, rotating shaft; 8, turntable; 9, eccentric shaft; 10, connecting rod; 11, telescopic rod; 12, lifting block; 13, lifting plate; 14, insertion rod; 15, fixed pipe; 16, first processing chamber; 17, second processing chamber; 18, movable rod; 19, hollow disc; 20, air delivery pipe; 21, rotary joint; 22, first fan; 23, second fan; 24, intake pipe; 25, outlet pipe; 26, air outlet; 27, air inlet; 28, annular plate; 29, sector block; 30, sector-shaped housing; 31, activated carbon; 32, reciprocating thread sleeve; 33, moving seat; 34, first rack; 35, first gear; 36, second rack; 37, second gear; 38, sleeve; 39, L-shaped plate; 40, cutting knife; 41, moving rod; 42, sliding block; 43, locking block; 44, limiting plate; 45, spring; 46, partition plate; 47, mesh demister; 48, heat conducting sheet; 49, screw column. Detailed implementation manners

[0018] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0019] Figures 1-9 This is the best embodiment of the present invention. The following will further explain the present invention in conjunction with the attached Figures 1-9 Make a further explanation of the present invention.

[0020] Refer to the attached Figures 1-9, an injection molding pipe twin-screw extrusion molding machine and an injection molding pipe production process, including a base 1, an extrusion barrel 2 installed on the upper side of the base 1, and a screw column 49 arranged inside the extrusion barrel 2. Two screw columns 49 are arranged side by side to form a twin-screw extrusion structure. A drive box 3 is installed on the top of the base 1, and both screw columns 49 are communicated with the drive box 3, which has the same structure as the extrusion screw of a twin-screw extrusion molding machine with the publication number CN211994133U. The drive box 3 includes an extrusion motor and a speed reducer. Both the extrusion motor and the speed reducer are installed on the base 1. The output shaft of the extrusion motor is connected to the input shaft of the speed reducer, and the output shaft of the speed reducer is connected to any one of the screw columns 49 through a coupling. Transmission gears that mesh with each other are arranged on both screw columns 49. A feed hopper is arranged on the upper side of the feed end of the extrusion barrel 2, and an extrusion head is installed at the discharge end of the extrusion barrel 2. A heater is fixed on the extrusion barrel 2. Specifically, the heater is a prior art and can adopt an electric heating coil. A gas treatment mechanism is arranged on the base 1.

[0021] The gas treatment mechanism includes a treatment box 5 installed on the top of the base 1. The treatment box 5 is a cuboid box body. The treatment box 5 is located on one side of the middle of the extrusion barrel 2. A first treatment chamber 16 and a second treatment chamber 17 are sequentially arranged in the treatment box 5 from bottom to top. A hollow disc 19 is arranged in the first treatment chamber 16, and a circular shell composed of two sector-shaped shells 30 is arranged in the second treatment chamber 17. Activated carbon 31 is filled in both sector-shaped shells 30. An annular plate 28 is installed in the second treatment chamber 17, and the annular plate 28 is located below the sector-shaped shell 30. A plurality of ventilation holes are opened on both the hollow disc 19 and the annular plate 28. A drive air inlet assembly for rotating the hollow disc 19 and the two sector-shaped shells 30 is arranged on the base 1.

[0022] With the above structure, before use, the raw materials and the reaction solution are respectively poured into the feed hopper and the treatment tank 5. The raw materials enter the extrusion cylinder 2 through the feed hopper. The drive box 3 drives the screw column 49 to rotate, causing the raw materials to move along the extrusion cylinder 2. During this process, the heater outside the extrusion cylinder 2 heats the raw materials, gradually softening and melting them. The raw materials in the molten state continue to move along the extrusion cylinder 2 under the shearing and conveying action of the screw column 49, and finally are evenly extruded through the forming channel of the extrusion head, thus achieving extrusion molding. At the same time, during the processing, the gas in the extrusion cylinder 2 is driven into the hollow disc 19 by the air intake assembly and discharged from the multiple air permeable holes of the hollow disc 19. After contacting the reaction solution, it absorbs hydrogen chloride. At this time, the gas continues to move and contacts the activated carbon 31. The activated carbon 31 adsorbs and filters the vinyl chloride monomer and dioxin in the gas. The filtered gas is then sent into the extrusion cylinder 2 through the air intake assembly, thereby classifying and filtering hydrogen chloride, vinyl chloride monomer, and dioxin with high filtration efficiency. At the same time, the air intake assembly causes the hollow disc 19 and the two sector-shaped shells 30 to rotate, enabling the gas to contact the reaction solution and the activated carbon 31 at different positions. Moreover, when the gas rises, it is blocked by the annular plate 28, causing the gas to disperse and move upward through the multiple air permeable holes on the annular plate 28, thereby enabling the gas to diffuse evenly, and thus enabling the gas to fully contact the reaction solution and the activated carbon 31.

[0023] As Figures 2-6As shown in the figure, the driving air intake assembly includes a mounting hole formed in the hollow disc 19. A gas delivery pipe 20 is mounted on the mounting hole. The upper end of the gas delivery pipe 20 extends outside the processing box 5, and the lower end extends into the mounting hole. An exhaust port is provided at the bottom of the processing box 5. Two sector-shaped shells 30 are fixedly connected to the gas delivery pipe 20 through a fixing unit. A rotary joint 21 is mounted at the top of the gas delivery pipe 20. The rotary joint 21 is located outside the processing box 5. A first fan 22 and a second fan 23 are mounted on the upper side of the processing box 5. An air outlet 26 and an air inlet 27 are formed at the top of the extrusion barrel 2. The inlet end and the outlet end of the first fan 22 are respectively mounted with an air inlet pipe 24 and a first air pipe. The other ends of the air inlet pipe 24 and the first air pipe are respectively communicated with the inner wall of the air outlet 26 and the rotary joint 21. The inlet end and the outlet end of the second fan 23 are respectively mounted with a second air pipe and an air outlet pipe 25. The second air pipe and the air outlet pipe 25 are respectively communicated with the exhaust port and the air inlet 27. Filters are mounted in both the air outlet 26 and the air inlet 27. A driving hole is formed at the bottom of the processing box 5. A sleeve 38 is rotatably mounted in the driving hole. Two L-shaped plates 39 are symmetrically mounted on both sides of the sleeve 38. Cutting knives 40 are mounted on the tops of the two L-shaped plates 39. The cutting knives 40 are arranged along the radial direction of the hollow disc 19. A movable rod 18 is rotatably mounted in the sleeve 38. The hollow disc 19 is coaxially and fixedly mounted at the top end of the movable rod 18. A driving unit for rotating the movable rod 18 and the sleeve 38 is provided on the base 1. In this embodiment, a sealing is provided between the movable rod 18 and the sleeve 38, and the sealing can be achieved by using a sealing ring or a mechanical seal.

[0024] In this solution, the gas in the extrusion barrel 2 flows out, is adsorbed and filtered, and then is discharged into the extrusion barrel 2. Through the settings of the movable rod 18, the sleeve 38, the L-shaped plates 39 and the cutting knives 40, the rotation of the hollow disc 19 drives the movement of the cutting knives 40, thereby cutting the bubbles.

[0025] Specifically, through the gas delivery pipe 20, the rotary joint 21, the first fan 22, the air inlet pipe 24, the first air pipe and the air outlet 26, the toxic gas in the extrusion barrel 2 can be sucked and conveyed, so that the gas enters into the hollow disc 19. Then, after the gas is filtered and adsorbed, it will be conveyed into the extrusion barrel 2 under the cooperation of the second fan 23, the air outlet pipe 25, the second air pipe, the exhaust port and the air inlet 27, thereby forming a gas cycle, and continuously processing the gas in the extrusion barrel 2. Through the settings of the movable rod 18 and the driving unit, the hollow disc 19 can be rotated, so that the gas contacts the reaction solution at different positions. At the same time, the driving unit will rotate the sleeve 38, and the sleeve 38 will make the cutting knives 40 move in a circular motion through the L-shaped plates 39, cutting the bubbles, thereby refining the bubble size and increasing the gas-liquid contact area, effectively improving the reaction efficiency and strengthening the separation effect.

[0026] Such as Figure 6As shown, the driving unit includes a servo motor 4 installed on the side of the base 1. An installation groove is formed at the top of the base 1. A rotating shaft 7 is rotatably installed in the installation groove. One end of the rotating shaft 7 is fixedly connected to the output shaft of the servo motor 4. A reciprocating thread sleeve 32 is fixedly sleeved on the rotating shaft 7. A moving seat 33 is threadedly sleeved on the reciprocating thread sleeve 32. A first rack 34 and a second rack 36 are installed on the side of the moving seat 33. The second rack 36 is located above the first rack 34. The bottom end of the movable rod 18 extends outside the sleeve 38 and is provided with a first gear 35. The first gear 35 meshes with the first rack 34. A second gear 37 is installed at the bottom end of the sleeve 38. The second gear 37 meshes with the second rack 36. A degassing element adapted to the extrusion barrel 2 is arranged on the base 1. The degassing element is cooperatively installed with the rotating shaft 7.

[0027] Specifically, the servo motor 4 drives the rotating shaft 7 to rotate. The rotating shaft 7 drives the moving seat 33 to reciprocate through the reciprocating thread sleeve 32. The moving seat 33 makes the first gear 35 and the second gear 37 rotate simultaneously through the first rack 34 and the second rack 36, so that the movable rod 18 and the sleeve 38 rotate simultaneously. In this embodiment, the reciprocating thread sleeve 32 continuously rotates in one direction to achieve the reciprocating movement of the moving seat 33, which belongs to the prior art.

[0028] As Figure 6 shown, a guide rod is installed in the installation groove. The guide rod is arranged parallel to the rotating shaft 7. The moving seat 33 is slidably connected to the guide rod.

[0029] In this solution, through the arrangement of the guide rod, a certain guiding effect is achieved. During use, the moving seat 33 can move more stably in the horizontal direction.

[0030] As Figure 6 shown, the module of the first gear 35 is the same as that of the second gear 37, and the number of teeth of the first gear 35 is greater than that of the second gear 37.

[0031] In this solution, through the setting of the tooth number ratio of the first gear 35 and the second gear 37, the rotation speed of the movable rod 18 is less than that of the sleeve 38.

[0032] Specifically, when the first rack 34 and the second rack 36 move, the first gear 35 and the second gear 37 will rotate. At this time, due to the tooth number ratio of the first gear 35 and the second gear 37, the rotation speed of the first gear 35 will be less than that of the second gear 37. Furthermore, the rotation speed of the movable rod 18 is less than that of the sleeve 38, so that the rotation speed of the hollow disc 19 is less than that of the cutting tool 40, avoiding the same rotation speed of the cutting tool 40 and the hollow disc 19 and affecting the cutting effect.

[0033] As Figure 3 、 Figure 5and Figure 6 As shown in the figure, the degassing element includes a turntable 8 installed at one end of a rotating shaft 7. An eccentric shaft 9 is eccentrically installed on one side of the turntable 8. A connecting rod 10 is rotatably sleeved on the eccentric shaft 9. A telescopic rod 11 is installed on the top of the base 1. A lifting block 12 is installed at the end of the telescopic rod 11. The other end of the connecting rod 10 is rotatably installed at the bottom of the lifting block 12. A lifting plate 13 is installed on the side of the lifting block 12. A plurality of insertion rods 14 are installed at the bottom of the lifting plate 13. A plurality of insertion holes are formed in the top of the extrusion barrel 2. A fixing tube 15 corresponding to each insertion rod 14 is installed on each of the plurality of insertion holes. The lower ends of the insertion rods 14 can all slide into the corresponding fixing tubes 15.

[0034] Specifically, when the rotating shaft 7 rotates, the lifting plate 13 will move up and down reciprocally, and then the insertion rods 14 will continuously move up and down. Under the action of the fixing tubes 15, the insertion rods 14 will continuously insert into the molten raw materials in the extrusion barrel 2, so that the bubbles wrapped in the melt will burst, and then the gas will escape by using the shear effect of the melt flow, thus avoiding the influence on the product quality caused by bubble inclusion.

[0035] As Figure 7 and Figure 9 shown in the figure, the fixing unit includes a sector block 29 installed on the outer wall of the air delivery pipe 20. Two moving cavities are formed in the sector block 29. A sliding block 42 is slidably installed in each of the two moving cavities. A moving rod 41 and a locking block 43 are respectively installed on the opposite sides of the two sliding blocks 42. The locking block 43 is arranged on the side close to the air delivery pipe 20, and the top of the locking block 43 is inclined and gradually approaches the air delivery pipe 20 from top to bottom. The other ends of the two moving rods 41 both extend outside the sector block 29 and are installed with a pulling plate. A limiting plate 44 is installed at the bottom of each of the two sector-shaped shells 30. Two limiting grooves communicating with the moving cavities are formed in the top of the sector block 29. A clamping groove is formed in the side of each of the two limiting plates 44. A spring 45 is installed on the side of each of the two sliding blocks 42 away from the locking block 43. The spring 45 is sleeved on the moving rod 41.

[0036] Specifically, the locking block 43 can be driven to move through the pulling plate and the moving rod 41, so that the locking block 43 is separated from the clamping groove, and then the limitation on the limiting plate 44 is cancelled; during installation, the limiting plate 44 moves downward and presses the top of the locking block 43, and with the cooperation of the spring 45, the locking block 43 first moves out of the way and then resets and extends into the clamping groove to fix the limiting plate 44, thus facilitating the replacement of the activated carbon 31 and reducing the replacement time.

[0037] As Figure 8As shown, a partition plate 46 is installed on the inner wall of the first processing chamber 16. A flow hole is provided in the middle of the partition plate 46. A mesh demister 47 is installed on the inner wall of the flow hole. Three fixing holes are provided on the air delivery pipe 20, and heat conducting sheets 48 are installed on all three fixing holes. The heat conducting sheets 48 are located in the flow hole and are located above the mesh demister 47. In this embodiment, the partition plate 46 is located between the first processing chamber 16 and the second processing chamber 17.

[0038] Specifically, the first processing chamber 16 and the second processing chamber 17 can be separated by the partition plate 46, so that gas can only enter the second processing chamber 17 from the flow hole. At the same time, the flowing gas will contact the mesh demister 47 and the heat conducting sheets 48. At this time, the fine mesh layer of the mesh demister 47 can efficiently intercept the water vapor droplets carried in the gas, and the heat conducting sheets 48 will absorb the waste heat of the high-temperature gas in the pipe in real time and form heat conduction, and perform heat exchange on the gas after the demisting treatment to improve the activity of the activated carbon 31.

[0039] As Figure 1 and Figure 4 shown, a sealing door 6 is hingedly installed on the side of the processing box 5. A drain pipe communicating with the first processing chamber 16 is fixedly provided at the bottom of the processing box 5, and a valve is fixedly provided on the drain pipe.

[0040] In this solution, through the settings of the sealing door 6 and the drain pipe, it is convenient to maintain the devices inside the processing box 5. Through the setting of the drain pipe, it is convenient to process the solution after the reaction in the first processing chamber 16.

[0041] The injection pipe production process of an injection pipe twin-screw extrusion molding machine includes the following steps: S1: Before use, pour the raw materials and the reaction solution into the feed hopper and the processing box 5 respectively. The reaction solution is only introduced into the first processing chamber 16. The reaction solution can be sodium carbonate solution, sodium bicarbonate solution, organic weak base solution (such as triethanolamine), etc. After the raw materials enter the feed hopper, they enter the inside of the extrusion barrel 2 under the action of gravity. Then, the screw column 49 is rotated by the drive box 3, and the raw materials are pushed forward. During this process, the segmented heaters outside the extrusion barrel 2 are provided with multiple independently controlled segments, so as to realize the gradient heating of the raw materials. The raw materials are gradually softened and melted through precise temperature control. The molten raw materials continue to move forward under the action of screw shearing and conveying, and finally are evenly extruded through the forming flow channel of the extrusion head, so as to be extruded and formed; S2: When heating, start the servo motor 4. Starting the servo motor 4 will cause the rotating shaft 7 to rotate. The rotation of the rotating shaft 7 will cause the inserting rod 14 to move up and down continuously, and then continuously insert the molten raw materials in the extrusion barrel 2, so that the bubbles wrapped in the melt burst, and then use the shear effect of the melt flow to make the gas escape, so as to avoid affecting the product quality due to bubble inclusion. S3: Start the first fan 22 and the second fan 23. The output of the first fan 22 causes the gas in the extrusion barrel 2 to discharge from multiple ventilation holes on the hollow disk 19 and contact the reaction solution. At this time, the reaction solution will react with hydrogen chloride, while vinyl chloride monomer and dioxin will not react with the reaction solution and will continue to move. After passing through the mesh demister 47 and the heat conducting sheet 48, the moisture in the gas is removed. The gas will continue to move and contact the activated carbon 31. The activated carbon 31 adsorbs and filters the vinyl chloride monomer and dioxin in the gas. The adsorbed gas then enters the extrusion barrel 2 through the second fan 23, the air outlet pipe 25, the exhaust port, the air inlet 27 and the second air pipe, so as to classify and filter hydrogen chloride, vinyl chloride monomer and dioxin, thus avoiding interference caused by unified filtration and affecting the removal efficiency. S4: At the same time, the rotation of the rotating shaft 7 causes the hollow disk 19 to rotate. The rotation of the hollow disk 19 makes the gas contact the reaction solution at different positions. The rising gas will first be blocked by the annular plate 28 and then dispersed and move upward through the ventilation holes, making the gas evenly diffuse. At the same time, the rotation of the hollow disk 19 causes the two sector-shaped shells 30 to rotate through the air delivery pipe 20. The rotation of the two sector-shaped shells 30 causes the activated carbon 31 to move, so that the gas contacts the activated carbon 31 at different positions, thus enabling the gas to fully contact the reaction solution and the activated carbon 31 and avoiding local contact filtration from affecting the filtration effect. S5: When the rotating shaft 7 rotates, it causes the cutting knife 40 to perform circular motion. The circular motion of the cutting knife 40 cuts the bubbles, thereby refining the bubble size, increasing the gas-liquid contact area, improving the reaction efficiency and strengthening the separation effect.

[0042] Working principle of this device: Before use, pour the raw materials and the reaction solution into the feed hopper and the treatment tank 5 respectively. After the raw materials enter the feed hopper, they will enter the interior of the extrusion barrel 2 under the action of gravity. Then, through the drive box 3, the screw column 49 rotates. At this time, the meshing rotation of the screw column 49 forms forced conveyance, and the solid raw materials in the extrusion barrel 2 are pushed forward axially. During this process, the segmented heater outside the extrusion barrel 2 synchronously heats the raw materials in a gradient manner. Through precise temperature control, the raw materials are gradually softened and melted. The raw materials in the molten state continue to move forward under the action of screw shearing and conveyance, and finally are evenly extruded through the forming flow channel of the extrusion head, thus achieving extrusion molding.

[0043] When heated, the servo motor 4, the first blower 22 and the second blower 23 are started. Starting the servo motor 4 causes the rotating shaft 7 to rotate. The rotation of the rotating shaft 7 causes the turntable 8 to rotate. The rotation of the turntable 8 causes the eccentric shaft 9 to perform a circular motion. The circular motion of the eccentric shaft 9 applies a force to the lifting block 12 through the connecting rod 10. The lifting block 12 moves up and down continuously under the action of the telescopic rod 11. The continuous up and down movement of the lifting block 12 causes the lifting plate 13 to move up and down continuously. The continuous up and down movement of the lifting plate 13 causes the insertion rod 14 to move up and down continuously. The continuous up and down movement of the insertion rod 14 continuously inserts the molten raw material in the extrusion cylinder 2 under the action of the fixed tube 15, thereby causing the bubbles wrapped in the melt to burst. Then, the shear effect of the melt flow is used to make the gas escape, thus avoiding the influence on the product quality caused by bubble inclusion. At the same time, the output of the first blower 22 will output the gas generated by the heating of the raw material and overflowing due to the bursting of the bubbles in the extrusion cylinder 2 to the rotary joint 21 through the air inlet pipe 24, the air outlet 26 and the first air pipe. At this time, the gas will continue to flow and be output to the hollow disc 19 through the air delivery pipe 20, and then discharged from a plurality of air permeable holes and contacted with the reaction solution. At this time, the reaction solution will react with hydrogen chloride, while vinyl chloride monomer and dioxin will continue to move without reacting with the reaction solution. The gas continues to move and enters the second treatment chamber 17. At this time, the gas will first be blocked by the annular plate 28 and then dispersed and move upward through the air permeable holes, thereby making the gas uniformly diffuse. Then the gas continues to rise and contacts the activated carbon 31. When contacting, the activated carbon 31 adsorbs and filters the vinyl chloride monomer and dioxin in the gas. The adsorbed gas is then discharged into the extrusion cylinder 2 through the second blower 23, the air outlet pipe 25, the exhaust port, the air inlet 27 and the second air pipe, thereby classifying and filtering hydrogen chloride, vinyl chloride monomer and dioxin, thus avoiding the interference caused by unified filtration and affecting the removal efficiency. At the same time, when the rotating shaft 7 rotates, it causes the reciprocating thread sleeve 32 to rotate. The rotation of the reciprocating thread sleeve 32 causes the moving seat 33 to reciprocate under the action of the guide rod. The reciprocating movement of the moving seat 33 causes the first rack 34 to reciprocate. The reciprocating movement of the first rack 34 causes the first gear 35 to rotate. The rotation of the first gear 35 causes the movable rod 18 to rotate. The rotation of the movable rod 18 causes the hollow disc 19 to rotate, thereby making the gas contact the reaction solution at different positions. At the same time, the rotation of the hollow disc 19 causes the air delivery pipe 20 to rotate. The rotation of the air delivery pipe 20 causes the two sector-shaped shells 30 to rotate through the sector-shaped block 29. The rotation of the two sector-shaped shells 30 causes the activated carbon 31 to move, thereby making the gas contact the activated carbon 31 at different positions, so that the gas is in full contact with the reaction solution and the activated carbon 31, avoiding local contact filtration and affecting the filtration effect.

[0044] When the moving seat 33 reciprocates, it will drive the second rack 36 to reciprocate. The reciprocating movement of the second rack 36 will cause the second gear 37 to rotate. The reciprocating rotation of the second gear 37 will cause the sleeve 38 to rotate. The rotation of the sleeve 38 will cause the L-shaped plate 39 to perform a circular motion. The circular motion of the L-shaped plate 39 will cause the cutting knife 40 to perform a circular motion. The circular motion of the cutting knife 40 will cut the bubbles, thereby refining the bubble size and increasing the gas-liquid contact area, effectively improving the reaction efficiency and strengthening the separation effect.

[0045] After the gas reacts with the reaction solution, the gas will contact the mesh demister 47 during the rising process. At this time, the fine mesh layer of the mesh demister 47 can efficiently intercept the water vapor droplets carried in the gas. At the same time, the heat-conducting sheet 48 arranged along the gas transmission pipe 20 can absorb the waste heat of the high-temperature gas in the pipe in real time and form heat conduction to exchange heat with the gas that has undergone demisting treatment.

[0046] When the activated carbon 31 needs to be replaced, pull the pull plate. The movement of the pull plate will cause the moving rod 41 to move. The movement of the moving rod 41 will cause the sliding block 42 to move. The movement of the sliding block 42 will cause the locking block 43 to move. When the locking block 43 moves out of the card slot, the limiting plate 44 is not limited, and then the limiting plate 44 is moved out, and then the sector-shaped housing 30 is moved out. After moving out, release the pull plate, and the sliding block 42 will reset under the action of the spring 45. Then insert the limiting plate 44 on the new sector-shaped housing 30 into the limiting groove. When the limiting plate 44 contacts the locking block 43, the continuous movement of the limiting plate 44 will squeeze the locking block 43 to make it move. When the card slot is aligned with the locking block 43, the locking block 43 will reset under the action of the spring 45, thereby fixing the limiting plate 44, so as to facilitate the replacement of the activated carbon 31 and reduce the replacement time.

[0047] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. Injection pipe twin-screw extrusion molding machine, including a base (1), characterized in that: A drive box (3) is installed on the top of the base (1). A screw column (49) is rotatably installed on the side of the drive box (3) through a gear set. An extrusion barrel (2) is installed on the side of the drive box (3). A feed hopper and an extrusion head are respectively installed on the top and side of the extrusion barrel (2). A heater is fixedly installed on the extrusion barrel (2). A gas treatment mechanism is arranged on the base (1). The gas treatment mechanism includes a treatment box (5) installed on the top of the base (1). A first treatment chamber (16) and a second treatment chamber (17) which are communicated with each other are sequentially arranged in the treatment box (5) from bottom to top. A hollow disc (19) and two sector-shaped shells (30) are respectively arranged in the first treatment chamber (16) and the second treatment chamber (17). Activated carbon (31) is fixedly installed on both of the two sector-shaped shells (30). An annular plate (28) is installed in the second treatment chamber (17). A plurality of ventilation holes are formed in both the hollow disc (19) and the annular plate (28). A drive air intake assembly for rotating the hollow disc (19) and the two sector-shaped shells (30) is arranged on the base (1).

2. The injection molding pipe twin-screw extrusion molding machine according to claim 1, characterized in that, The drive air intake assembly includes a mounting hole formed in the top of the hollow disc (19). An air delivery pipe (20) is installed on the mounting hole. The two sector-shaped shells (30) are fixedly connected to the air delivery pipe (20) through a fixing unit. The top of the air delivery pipe (20) extends outside the treatment box (5) and is installed with a rotary joint (21). An exhaust port is arranged at the bottom of the treatment box (5). A first fan (22) and a second fan (23) are installed on the top of the treatment box (5). An air outlet (26) and an air inlet (27) are formed in the top of the extrusion barrel (2). The inlet end and the outlet end of the first fan (22) are respectively installed with an air inlet pipe (24) and a first air pipe. The other ends of the air inlet pipe (24) and the first air pipe are respectively communicated with the air outlet (26) and the rotary joint (21). The inlet end and the outlet end of the second fan (23) are respectively installed with a second air pipe and an air outlet pipe (25). The second air pipe and the air outlet pipe (25) are respectively communicated with the exhaust port and the air inlet (27). Filters are installed in both the air outlet (26) and the air inlet (27). A drive hole is formed in the bottom of the treatment box (5). A sleeve (38) is rotatably installed on the drive hole. Two L-shaped plates (39) are installed outside the sleeve (38). Cutting knives (40) are installed on the tops of the two L-shaped plates (39). A movable rod (18) is rotatably installed in the sleeve (38). The hollow disc (19) is installed on the top end of the movable rod (18). A drive unit for rotating the movable rod (18) and the sleeve (38) is arranged on the base (1).

3. The injection molding pipe twin-screw extrusion molding machine according to claim 2, characterized in that, The driving unit includes a servo motor (4) installed on the side of the base (1). An installation groove is formed at the top of the base (1), and a rotating shaft (7) is rotatably installed in the installation groove. One end of the rotating shaft (7) is connected to the output shaft of the servo motor (4). A reciprocating thread sleeve (32) is sleeved on the rotating shaft (7), and a moving seat (33) is threadedly sleeved on the reciprocating thread sleeve (32). A first rack (34) and a second rack (36) are installed on the side of the moving seat (33). The bottom end of the movable rod (18) extends outside the sleeve (38) and is provided with a first gear (35). The first gear (35) meshes with the first rack (34). A second gear (37) is installed at the bottom end of the sleeve (38). The first gear (35) and the second gear (37) respectively mesh with the first rack (34) and the second rack (36). A degassing element adapted to the extrusion barrel (2) is arranged on the base (1), and the degassing element is cooperatively installed with the rotating shaft (7).

4. The injection-molded pipe twin-screw extrusion molding machine according to claim 3, characterized in that, A guide rod is installed in the installation groove, and the moving seat (33) is slidably connected to the guide rod.

5. The injection molding pipe twin-screw extrusion molding machine according to claim 3, characterized in that, The number of teeth of the first gear (35) is greater than the number of teeth of the second gear (37).

6. The injection molding pipe twin-screw extrusion molding machine according to claim 3, characterized in that, The degassing element includes a turntable (8) installed at one end of the rotating shaft (7). An eccentric shaft (9) is eccentrically installed on the side of the turntable (8). A connecting rod (10) is rotatably sleeved on the eccentric shaft (9). A telescopic rod (11) is installed at the top of the base (1), and a lifting block (12) is installed at the end of the telescopic rod (11). The other end of the connecting rod (10) is rotatably installed at the bottom of the lifting block (12). A lifting plate (13) is installed on the side of the lifting block (12), and a plurality of insertion rods (14) are installed at the bottom of the lifting plate (13). A plurality of insertion holes are formed at the top of the extrusion barrel (2), and fixing tubes (15) adapted to the insertion rods (14) are installed on the plurality of insertion holes.

7. The injection molding pipe twin-screw extrusion molding machine according to claim 2, characterized in that, The fixing unit includes a sector block (29) installed on the outer wall of the air delivery pipe (20). Two moving cavities are formed in the sector block (29), and sliding blocks (42) are slidably installed in the two moving cavities. Moving rods (41) and locking blocks (43) are respectively installed on the two sides of the two sliding blocks (42) away from each other. The other ends of the two moving rods (41) both extend outside the sector block (29) and are provided with pull plates. Limiting plates (44) are installed at the bottoms of the two sector-shaped shells (30). Two limiting grooves communicating with the moving cavities are formed at the top of the sector block (29). Card slots are formed on the sides of the two limiting plates (44). Springs (45) are installed on the sides of the two sliding blocks (42), and the other ends of the two springs (45) are respectively installed on the inner walls of the two sides of the two moving cavities.

8. The injection-molded pipe twin-screw extrusion molding machine according to claim 2, characterized in that, A partition plate (46) is installed on the inner wall of the side of the first processing chamber (16). A flow hole is formed in the middle of the partition plate (46), and a mesh demister (47) is installed in the flow hole.

9. The injection molding pipe twin-screw extrusion molding machine according to claim 1, wherein, A sealing door (6) is hingedly installed on the side of the processing box (5). A drain pipe communicating with the first processing chamber (16) is fixedly provided at the bottom of the processing box (5), and a valve is fixedly provided on the drain pipe.

10. The injection pipe production process of the injection pipe double-screw extrusion molding machine according to any one of claims 1-9, characterized in that, It includes the following steps: S1: Before use, pour the raw material and the reaction solution into the feed hopper and the processing box (5) respectively. After the raw material enters the feed hopper, it will enter the inside of the extrusion barrel (2) under the action of gravity. Then, the screw column (49) is rotated by the drive box (3), and the raw material is pushed forward. During this process, the heater on the extrusion barrel (2) performs gradient heating on the raw material, and finally, it is evenly extruded through the forming flow channel of the extrusion head, so as to be extruded into shape. S2: The gas in the extrusion barrel (2) is sent into the hollow disc (19), discharged from the plurality of air-permeable holes on the hollow disc (19) and contacts the reaction solution. At this time, the reaction solution will react with hydrogen chloride, and then the gas removing moisture will continue to move and contact the activated carbon (31). The activated carbon (31) adsorbs and filters the vinyl chloride monomer and dioxin in the gas, and the adsorbed gas is sent into the extrusion barrel (2) again. S4: The hollow disc (19) rotates, so that the gas contacts the reaction solution at different positions. Then, the rising gas will be blocked by the annular plate (28) first, and then dispersed and move upward through the air-permeable holes, so that the gas is evenly diffused.

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