Extruder voc devolatilization device

Abstract

The present application relates to a kind of extruder VOC devolatilization device, including extruder, further comprising: recovery mechanism, recovery mechanism is sealed with the exhaust hole of extruder by detachable connection component connection;Refrigeration cycle system, refrigeration cycle system is connected with recovery mechanism by pipeline, and creates refrigeration environment inside recovery mechanism;Vacuum pump, vacuum pump is connected with recovery mechanism by pipeline, vacuum pump constructs vacuum environment by pipeline to recovery mechanism and the exhaust hole of extruder, and vacuum pump drives recovery mechanism to collect condensed VOC when working.The kind of extruder VOC devolatilization device, by setting recovery mechanism, realize the condensation recovery of VOC, and vacuum pump drives the rotation of pipe shaft, condensing plate and rotating disc in condensing cylinder when working, the VOC condensed on condensing surface is collected, and the load pressure of refrigeration cycle system is reduced, by setting detachable connection component, condensing cylinder is sealed with the exhaust hole of extruder and connected, easy to disassemble, maintenance is convenient.

Description

Technical Field

[0001] This invention relates to the field of extruder equipment, specifically to a VOC devolatilization device for an extruder. Background Technology

[0002] In the production of polymer materials (especially engineering plastics and high-performance polymers), it is necessary to remove volatile organic compounds (VOCs) generated in the molten state to meet product purity, performance, and safety standards. VOCs escaping from extruders cannot be directly emitted because they pose significant environmental and health hazards. Furthermore, many VOCs are flammable and explosive (such as acetone, ethanol, and benzene), and reach certain concentrations in the air, posing an explosion risk and safety hazard in the working environment. Therefore, condensing and recovering high-concentration VOCs escaping from extruders can improve their recycling value and significantly reduce the pressure and difficulty of subsequent VOC treatment. Based on this, we propose an extruder VOC devolatilization device. Summary of the Invention

[0003] The purpose of this invention is to provide a VOC devolatilization device for an extruder to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a VOC devolatilization device for an extruder, comprising an extruder, and further comprising the following parts:

[0004] The recycling mechanism is sealed to the vent holes on the extruder via a detachable connecting component;

[0005] The refrigeration cycle system is connected to the recovery mechanism through pipelines and creates a refrigeration environment inside the recovery mechanism.

[0006] A vacuum pump is connected to the recovery mechanism via a pipeline. The vacuum pump creates a vacuum environment for the recovery mechanism and the exhaust port on the extruder through the pipeline. When the vacuum pump is working, it drives the recovery mechanism to collect the condensed VOCs.

[0007] Preferably, the recycling mechanism includes a conical condenser cylinder, and a cavity structure is formed inside the peripheral wall of the condenser cylinder. A disc box is coaxially fixedly connected to the large-diameter end of the condenser cylinder, and a turntable is rotatably connected to the end face of the disc box facing the inner side of the condenser cylinder. A through hole seven communicating with the cavity structure is formed on the disc box. A cap is fitted and fixedly connected to the small-diameter end of the condenser cylinder. The cap is connected to a detachable connecting assembly through a conduit, so that the detachable connecting assembly is sealed to the exhaust port of the extruder.

[0008] Preferably, a tube shaft is vertically inserted through the center of the end face of the tray away from the condenser cylinder, and the tube shaft is rotatably connected to the end face of the condenser cylinder. The tube shaft passes through and is fixedly connected to the center of the turntable. One end of the tube shaft inside the condenser cylinder is rotatably connected to a support, and the support is fixed to the inner wall of the smaller diameter end of the condenser cylinder. The other end of the tube shaft outside the condenser cylinder is fitted with and rotatably connected to a cap. The refrigerant output port of the refrigeration cycle system is connected to the cap through an output pipe. The refrigerant return port of the refrigeration cycle system is connected to the end of the cavity structure one near the cap through a return pipe.

[0009] Preferably, multiple condensing plates are fixed on a section of the circumferential wall inside the condensing cylinder of the tube shaft, and the condensing plates are in the shape of right-angled trapezoids. The multiple condensing plates are evenly distributed on the circumferential wall of the tube shaft along the circumferential direction. The inclined waist edge of the condensing plate is attached to the inner wall of the condensing cylinder and slides relative to it. The long side of the condensing plate is fixed on the turntable. A through hole five communicating with the cavity structure two is opened on the inclined waist edge of the condensing plate away from the tube shaft, and a through hole six communicating with the through hole five is opened on the turntable. A through hole three communicating with the cavity structure two is opened on the straight waist edge of the condensing plate near the support, and a through hole four communicating with the through hole three is opened on the circumferential wall of the tube shaft.

[0010] Preferably, a shaft bracket is fixed on the disc box, and a cap two is fixed on the shaft bracket. A worm gear is rotatably connected to the shaft bracket. One end of the worm gear is connected to the output shaft of the vacuum pump, and the other end is coaxially fixed to a reciprocating lead screw. A section of the tube shaft located outside the condenser cylinder passes through and is fixedly connected to the center of the worm wheel, and the worm wheel and worm gear are meshed. The lower end of the side wall of the large-diameter end of the condenser cylinder is fixed and connected to a collecting cylinder. A vacuum tube is fixedly connected to the side wall of the collecting cylinder, and the vacuum tube is inclined upward. A filter screen is fixed on the inner wall of the end of the vacuum tube connected to the collecting cylinder. The vacuum tube is connected to the suction port of the vacuum pump. A check valve two is fixed at the lower end of the collecting cylinder, and the check valve two is connected to a suction pipe two.

[0011] Preferably, the detachable connection assembly includes a cylinder fixed at the exhaust port of the extruder and a cap connected to a conduit. The cap is used to seal the upper end of the cylinder. An annular groove is fixed on the inner wall of the cap, and a through hole is provided on the side wall of the cap, which communicates with the bottom of the annular groove. The port of the through hole facing the outside of the cap is connected to a check valve, and the check valve is connected to a suction pipe.

[0012] Preferably, the recycling mechanism further includes a pump cylinder, inside which a piston plate is slidably connected, and a sliding connecting sleeve is fitted on a reciprocating screw and adapted to it. The sleeve is fixedly connected to the piston plate through a connecting rod. The bottom of the pump cylinder is connected to a suction pipe three and a check valve three. The suction pipe three is connected to suction pipe one and suction pipe two through a three-way pipe. The check valve three is connected to the collection tank through a discharge pipe.

[0013] Preferably, the lower end of the outer peripheral wall of the cap is fixed with an annular protrusion 1, and multiple insert rods are connected through and fixedly connected to the annular protrusion 1. The multiple insert rods are arranged at equal intervals along the circumference of the annular protrusion 1. The outer side of the column is fitted with an annular protrusion 2, an annular frame 2 and a gear ring from top to bottom. The annular protrusion 2 is fixed on the column and has a through hole 2 corresponding to the insert rod. The annular frame 2 is slidably connected to the column and has a through hole 8 corresponding to the insert rod. The gear ring is rotatably connected to the column with a fixed axis, and a rotating ring is fixed at the lower end of the gear ring.

[0014] Preferably, multiple screws are threaded through and connected to the second ring frame. The upper end of the screw is rotatably connected to the bottom surface of the second ring protrusion, and the lower end of the screw is coaxially fixedly connected to a gear. The multiple screws are evenly distributed on the second ring frame along the circumferential direction, and the multiple gears are respectively meshed with the gear ring.

[0015] Preferably, a cavity is formed on the inner side of the lower end of the insertion rod, and two symmetrically arranged slides are formed on the side wall of the lower end of the insertion rod, and the slides are connected to the cavity. A slide rod is slidably connected in the slides, and the opposite ends of the two slide rods are connected by a spring. A pull rod is inserted into and slidably connected in the insertion rod, and the lower end of the pull rod is located in the cavity. The lower end of the pull rod is connected to the two slide rods respectively through two connecting rods. The upper ends of the multiple pull rods are all fixedly connected to a ring frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. By setting up a recycling mechanism and using a refrigeration cycle system to create a refrigeration environment inside the recycling mechanism, and using a vacuum pump to create a vacuum environment at the exhaust port on the recycling mechanism and the extruder, VOCs can be condensed and recovered. When the vacuum pump is working, it drives the tube shaft, condenser plate and turntable inside the condenser to rotate, collect the VOCs condensed on the condenser surface and reduce the load pressure of the refrigeration cycle system.

[0018] 2. The condenser cylinder is sealed to the exhaust port on the extruder by setting a detachable connection component, which makes disassembly and assembly convenient and maintenance easy. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the overall assembly structure of the present invention;

[0020] Figure 2 for Figure 1 Enlarged structural diagram at point A in the diagram;

[0021] Figure 3 for Figure 1 Enlarged structural diagram at point B in the diagram;

[0022] Figure 4 for Figure 1 Enlarged structural diagram at point C;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the tube shaft and the various condensing plates on its peripheral wall in this invention.

[0024] Figure 6 for Figure 2 Enlarged structural diagram at point D in the diagram;

[0025] Figure 7 This is a schematic diagram of the structure of the two sliding rods at the lower end of the insertion rod in the retracted state in this invention.

[0026] In the diagram: 1. Extruder; 2. Sealing cap; 3. Guide tube; 4. Cap 1; 5. Condenser; 6. Vacuum pump; 7. Pan; 8. Shaft bracket; 9. Worm gear; 10. Pump barrel; 11. Refrigeration cycle system; 12. Return pipe; 13. Output pipe; 14. Suction pipe 1; 15. Support; 16. Pipe shaft; 17. Worm gear; 18. Cap 2; 19. Reciprocating screw; 20. Sliding sleeve; 21. Connecting rod 1; 22. Piston plate; 23. Suction pipe 3; 24. T-connector; 25. Cavity structure 1; 26. Condenser plate; 27. Cavity structure 2; 28. Vacuum tube; 29. ​​Filter screen; 30. Gathering cylinder; 3 1. Check valve 2; 32. Suction pipe 2; 33. Discharge pipe; 34. Check valve 3; 35. Ring frame 1; 36. Ring protrusion 1; 37. Ring protrusion 2; 38. Insert rod; 39. Gear; 40. Gear ring; 41. Rotary ring; 42. Ring groove; 43. Through hole 1; 44. Check valve 1; 45. Through hole 2; 46. Ring frame 2; 47. Screw; 48. Column; 49. Through hole 3; 50. Through hole 4; 51. Through hole 5; 52. Through hole 6; 53. Through hole 7; 54. Pull rod; 55. Cavity; 56. Slide rail; 57. Connecting rod 2; 58. Slide rod; 59. Spring; 60. Turntable; 61. Through hole 8. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1 to 7 The present invention provides a technical solution: a VOC devolatilization device for an extruder, comprising an extruder 1, and further comprising the following parts:

[0029] The recycling mechanism is sealed to the vent hole on the extruder 1 via a detachable connecting component;

[0030] The refrigeration cycle system 11 is connected to the recovery mechanism through pipelines and creates a refrigeration environment inside the recovery mechanism. The refrigeration cycle system 11 in this application is prior art and will not be described in detail here.

[0031] The vacuum pump is connected to the recovery mechanism via a pipeline, and the vacuum pump creates a vacuum environment for the recovery mechanism and the exhaust port on the extruder 1 through the pipeline. When the vacuum pump is working, it drives the recovery mechanism to collect the condensed VOCs. The vacuum pump in this application is prior art and will not be described in detail here.

[0032] In this embodiment, the recycling mechanism includes a conical condenser cylinder 5, and a cavity structure 25 is formed inside the peripheral wall of the condenser cylinder 5. A disc box 7 is coaxially fixedly connected to the large-diameter end of the condenser cylinder 5, and a turntable 60 is rotatably connected to the end face of the disc box 7 facing the inner side of the condenser cylinder 5. A through hole 53 communicating with the cavity structure 25 is formed on the disc box 7. A cap 4 is fitted and fixedly connected to the small-diameter end of the condenser cylinder 5. The cap 4 is connected to a detachable connecting assembly through a conduit 3, so that the detachable connecting assembly is sealed to the exhaust port of the extruder 1.

[0033] In this embodiment, a tube shaft 16 is vertically inserted through the center of the end face of the tray 7 away from the condenser cylinder 5, and the tube shaft 16 is rotatably connected to the end face of the condenser cylinder 5. The tube shaft 16 is inserted through and fixedly connected to the center of the turntable 60. One end of the tube shaft 16 located inside the condenser cylinder 5 is rotatably connected to the bracket 15, and the bracket 15 is fixed to the inner wall of the small diameter end of the condenser cylinder 5. The other end of the tube shaft 16 located outside the condenser cylinder 5 is fitted with and rotatably connected to a cap 18. The refrigerant output port of the refrigeration cycle system 11 is connected to the cap 18 through the output pipe 13. The refrigerant return port of the refrigeration cycle system 11 is connected to the end of the cavity structure 25 near the cap 4 through the return pipe 12.

[0034] In this embodiment, a plurality of condensing plates 26 are fixed on a section of the peripheral wall inside the condensing cylinder 5 of the tube shaft 16. The condensing plates 26 are in the shape of a right trapezoid. The plurality of condensing plates 26 are evenly distributed on the peripheral wall of the tube shaft 16 along the circumferential direction. The inclined waist edge of the condensing plate 26 is attached to the inner wall of the condensing cylinder 5 and slides relative to it. The long side of the condensing plate 26 is fixed on the turntable 60. A through hole 51 communicating with the cavity structure 27 is opened at the end of the inclined waist edge of the condensing plate 26 away from the tube shaft 16. A through hole 62 communicating with the through hole 51 is opened on the turntable 60. A through hole 3 49 communicating with the cavity structure 27 is opened at the end of the straight waist edge of the condensing plate 26 near the support 15. A through hole 40 communicating with the through hole 3 49 is opened on the peripheral wall of the tube shaft 16.

[0035] In this embodiment, a shaft bracket 8 is fixed on the disc box 7, and a cap 18 is fixed on the shaft bracket 8. A worm gear 17 is rotatably connected to the shaft bracket 8. One end of the worm gear 17 is connected to the output shaft of the vacuum pump 6, and the other end is coaxially fixedly connected to a reciprocating lead screw 19. A section of the tube shaft 16 located outside the condenser cylinder 5 passes through and is fixedly connected to the center of the worm wheel 9, and the worm wheel 9 is meshed with the worm gear 17. The lower end of the side wall of the large-diameter end of the condenser cylinder 5 is fixedly connected to the collecting cylinder 30. A vacuum tube 28 is fixedly connected to the side wall of the collecting cylinder 30, and the vacuum tube 28 is inclined upward, which can prevent condensed VOCs from flowing into the vacuum. Inside the vacuum tube 28, to improve the collection effect, a filter screen 29 is fixed on the inner wall of the end of the vacuum tube 28 that connects to the collecting cylinder 30. The filter screen 29 plays the role of blocking condensed VOC particles. In addition, the vacuum tube 28 is connected to the suction port of the vacuum pump 6. A check valve 21 is fixed at the lower end of the collecting cylinder 30. The check valve 21 is connected to the suction pipe 22. The exhaust port of the vacuum pump 6 is connected to the waste gas treatment system. The residual VOC after condensation is treated at the end, such as by thermal incineration, catalytic combustion, biological filtration, plasma oxidation, photocatalytic oxidation and other treatment processes, to convert it into carbon dioxide and water purification treatment.

[0036] In this embodiment, the detachable connection assembly includes a cylindrical tube 48 fixed at the exhaust port of the extruder 1 and a cap 2 connected to the conduit 3. The cap 2 is used to seal the upper end of the cylindrical tube 48. An annular groove 42 is fixed on the inner wall of the cap 2, and a through hole 43 communicating with the bottom of the annular groove 42 is opened on the side wall of the cap 2. The port of the through hole 43 facing the outside of the cap 2 is connected to a check valve 44, and the check valve 44 is connected to a suction pipe 14.

[0037] In this embodiment, the recycling mechanism also includes a pump cylinder 10, with a piston plate 22 slidably connected inside the pump cylinder 10. A sliding connecting sleeve 20 is fitted and adapted on the reciprocating screw 19, and the sleeve 20 is fixedly connected to the piston plate 22 through a connecting rod 21. The bottom of the pump cylinder 10 is connected to a suction pipe 23 and a check valve 34. The suction pipe 23 is connected to a suction pipe 14 and a suction pipe 22 through a three-way pipe 24. The check valve 34 is connected to a collection tank through a discharge pipe 33, which is not shown in this application.

[0038] In this embodiment, an annular protrusion 36 is fixed to the lower end of the outer peripheral wall of the cap 2. Multiple insert rods 38 are threaded through and fixedly connected to the annular protrusion 36. The insert rods 38 are arranged at equal intervals along the circumferential direction of the annular protrusion 36. From top to bottom, the outer surface of the column 48 is fitted with an annular protrusion 37, a ring frame 46, and a gear ring 40. The annular protrusion 37 is fixed to the column 48 and has through holes 45 corresponding to the insert rods 38. The ring frame 46 is slidably connected to the column 48 and has through holes 61 corresponding to the insert rods 38. The gear ring 40 is rotatably connected to the column 48, and a rotating ring 41 is fixed to the lower end of the gear ring 40. Multiple screws 47 are threaded through and threaded to the ring frame 46, and the upper ends of the screws 47 are rotatably connected to the ring frame 46. On the bottom surface of convex 37, a gear 39 is coaxially fixedly connected to the lower end of the screw 47. Multiple screws 47 are evenly distributed on the ring frame 46 along the circumferential direction. Multiple gears 39 are respectively meshed with the gear ring 40. A cavity 55 is opened on the inner side of the lower end of the insertion rod 38. Two symmetrically arranged slide rails 56 are opened on the side wall of the lower end of the insertion rod 38, and the slide rails 56 are connected to the cavity 55. A slide rod 58 is slidably connected in the slide rail 56, and the opposite ends of the two slide rods 58 are connected by a spring 59. A pull rod 54 is inserted into and slidably connected in the insertion rod 38, and the lower end of the pull rod 54 is located in the cavity 55. The lower end of the pull rod 54 is connected to the two slide rods 58 respectively through two connecting rods 57. The upper ends of multiple pull rods 54 are fixedly connected to the ring frame 35.

[0039] Working principle and advantages of this invention: The working process of this VOC devolatilization device for extruders is as follows:

[0040] like Figures 1 to 7 As shown, before starting the VOC devolatilization device of the extruder, the detachable connecting assembly needs to be sealed to the exhaust port of the extruder 1. The operation process is as follows:

[0041] like Figure 7As shown, in the initial state, the two sliding rods 58 are retracted into the slide rail 56 and do not protrude. At this time, the two connecting rods 57 maintain an angle of not less than 40°, pressing the cap 2 onto the upper end of the column 48, and a sealing strip is set between the contact surfaces to provide a better sealing effect. At the same time, each insert rod 38 passes through the corresponding through hole 45 and through hole 61 from top to bottom, so that the slide rail 56 is located below the through hole 61. Then, the ring frame 35 is pressed down, so that the ring frame 35 applies downward pressure to the pull rod 54, and the lower end of the pull rod 54 applies opposite thrust to the two sliding rods 58 through the two connecting rods 57 respectively, so that the two sliding rods 58 move away from each other and slide outward from the slide rail 56 against the elastic force of the spring 59, until the two connecting rods 57 and the two sliding rods 58 are in a straight line, and the pull rod 54 is perpendicular to the connecting rods 57. Furthermore, the lower end of the pull rod 54 abuts against the bottom surface of the cavity 55. At this time, the two connecting rods 57 and the two sliding rods 58 form a dead point state and keep the two sliding rods 58 from retracting. Then, the rotating ring 41 is rotated so that the rotating ring 41 drives the gear ring 40 to rotate, thereby causing the gear ring 40 to drive each gear 39 to rotate synchronously, and then causing the gear 39 to drive the screw 47 to rotate synchronously. While the screw 47 rotates, it drives the ring frame 46 to move down through the threaded transmission, and causes the ring frame 46 to apply downward pressure to the insertion rod 38 through the sliding rod 58, thereby causing the insertion rod 38 to press and fix the cap 2 on the column cylinder 48 through the annular protrusion 36, thus achieving a sealed connection. The annular groove 42 on the inner wall of the cap 2 is used to collect the VOCs that condense on the inner wall of the pipe due to the sudden drop in temperature caused by the high-temperature VOC vapor escaping from the exhaust hole, preventing it from flowing back into the exhaust hole and avoiding volatilization loss.

[0042] As described above, when it is necessary to remove the cap 2, firstly, rotate the rotating ring 41 in the opposite direction so that the rotating ring 41 drives the gear ring 40 to rotate in the opposite direction, thereby causing the gear ring 40 to synchronously drive each gear 39 to rotate in the opposite direction, and then causing the gear 39 to synchronously drive the screw 47 to rotate in the opposite direction. While the screw 47 rotates in the opposite direction, it drives the ring frame 46 to move upward through the threaded transmission, and causes the ring frame 46 to disengage from the slide rod 58 without applying downward pressure. Then, lift the ring frame 35 so that the ring frame 35 applies a pulling force to the two connecting rods 57 through the pull rod 54, breaking the dead point state of the two connecting rods 57. Under the restoring force of the spring 59, the two slide rods 58 move closer to each other and retract into the slide rail 56 without leakage. At this time, the cap 2 can be lifted and removed from the column cylinder 48. The operation is simple and convenient, easy to install and disassemble, and very convenient.

[0043] After sealing the vent holes, before the extruder 1 operates, the vacuum pump 6 and the refrigeration cycle system 11 are started via the control system. The vacuum pump 6 evacuates the inside of the condenser cylinder 5 through the vacuum pipe 28 and creates a vacuum environment at the vent holes through the conduit 3 and the column cylinder 48. This allows the VOCs in the molten raw material to be extracted through the vent holes and enter the condenser cylinder 5 for condensation and liquefaction, so that they can be collected in the collection cylinder 30. At the same time, after the refrigeration cycle system 11 starts working, it delivers the low-temperature refrigerant to the inside of the tube shaft 16 through the output pipe 13, and then enters the cavity structure 27 inside the condenser plate 26 through the through hole 40 and the through hole 39 to cool the condenser plate 26, so that the high-temperature VOCs can be collected. After contacting the condensing plate, condensation occurs. Multiple condensing plates 26 increase the condensation area. Then, the refrigerant enters the tray 7 through through hole 51 and through hole 6 52, and then enters the cavity structure 1 25 inside the side wall of the condensing cylinder 5 through through hole 7 53, thereby cooling the condensing cylinder 5. This allows the inner wall of the condensing cylinder 5 to form a low-temperature condensation surface, expanding the condensation area. On the other hand, the refrigerant in the cavity structure 1 25 surrounds the internal space of the condensing cylinder 5, helping to maintain a stable low-temperature effect inside the condensing cylinder 5. Then, the refrigerant flows back to the refrigeration cycle system 11 through the return pipe 12, forming a cycle to create a continuous and stable low-temperature environment inside the condensing cylinder 5, maintaining a stable and efficient condensation effect.

[0044] When the vacuum pump 6 is working, it drives the worm gear 17 to rotate, which in turn drives the worm wheel 9 and the reciprocating screw 19 to rotate. The rotation of the worm wheel 9 drives the tube shaft 16 and its condensing plate 26 and turntable 60 to rotate. This causes the inclined side of the condensing plate 26 to scrape down the condensed VOCs on the inner wall of the condensing cylinder 5 and collect them in the collecting cylinder 30. At the same time, the rotating condensing plate 26 increases the probability of contact with VOCs, thus better condensing the VOCs. Moreover, the rotating condensing plate 26 causes the VOCs condensed on its surface to flow towards the inclined side of the condensing plate 26 under centrifugal force, so that they can flow into the collecting cylinder 30 better. Meanwhile, the refrigerant inside the cavity structure 27 is subjected to centrifugal force to increase the internal driving force, so that the refrigerant can flow better in the cavity structure 27, the tray 7 and the cavity structure 25, reducing the load pressure of the refrigeration cycle system 11, improving its service life and ensuring operational stability.

[0045] As described above, while the reciprocating screw 19 rotates, it drives the piston plate 22 to move reciprocally within the pump cylinder 10 via the sliding sleeve 20 and connecting rod 21. This causes the piston plate 22 to alternately provide compression and suction within the pump cylinder 10. When suction is generated within the pump cylinder 10, this suction force applies suction to the suction pipe 14 and suction pipe 22 through the suction pipe 3 23 and the three-way pipe 24, respectively. This allows the condensed VOCs in the annular groove 42 and the condensed VOCs in the collecting cylinder 30 to enter the pump cylinder 10. When compression is generated within the pump cylinder 10, the condensed VOCs in the pump cylinder 10 are transported to the collection tank through the discharge pipe 33, thus realizing the recovery of condensed VOCs.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A VOC devolatilization device for an extruder, comprising an extruder (1), characterized in that: It also includes the following parts: The recycling mechanism is sealed to the exhaust port on the extruder (1) by means of a detachable connecting assembly; A refrigeration cycle system (11) is connected to the recycling mechanism through pipelines and creates a refrigeration environment inside the recycling mechanism; Vacuum pump (6), the vacuum pump (6) is connected to the recycling mechanism via a pipeline, and the vacuum pump (6) creates a vacuum environment for the recycling mechanism and the exhaust port on the extruder (1) via the pipeline, and the vacuum pump drives the recycling mechanism to collect the condensed VOC when it is working; The recycling mechanism includes a conical condenser (5), and a cavity structure (25) is opened inside the peripheral wall of the condenser (5). A disc box (7) is coaxially fixedly connected to the large diameter end of the condenser (5), and a turntable (60) is fixedly rotatably connected to the end face of the disc box (7) facing the inner side of the condenser (5). A through hole (53) is opened on the disc box (7) and communicates with the cavity structure (25). A cap (4) is fitted and fixedly connected to the small diameter end of the condenser (5). The cap (4) is connected to a detachable connection assembly through a conduit (3) and the detachable connection assembly is sealed to the exhaust port of the extruder (1). The plate box (7) is perpendicular to and has a tube shaft (16) through the center of the end face away from the condenser cylinder (5), and the tube shaft (16) is fixedly and rotatably connected to the end face of the condenser cylinder (5). The tube shaft (16) is through and fixedly connected to the center of the turntable (60). The end of the tube shaft (16) inside the condenser cylinder (5) is fixedly and rotatably connected to the bracket (15), and the bracket (15) is fixed to the inner wall of the small diameter end of the condenser cylinder (5). The end of the tube shaft (16) outside the condenser cylinder (5) is fitted with and fixedly and rotatably connected to the cap (18). The refrigerant output port of the refrigeration cycle system (11) is connected to the cap (18) through the output pipe (13). The refrigerant return port of the refrigeration cycle system (11) is connected to the end of the cavity structure (25) near the cap (4) through the return pipe (12). The disc box (7) is fixed with a shaft bracket (8), and the cap (18) is fixed on the shaft bracket (8). The shaft bracket (8) is rotatably connected to a worm gear (17). One end of the worm gear (17) is connected to the output shaft of the vacuum pump (6), and the other end is coaxially fixedly connected to a reciprocating screw (19). A section of the tube shaft (16) located outside the condenser (5) passes through and is fixedly connected to the center of the worm wheel (9), and the worm wheel (9) is meshed with the worm gear (17). The lower end of the side wall of the large diameter end of the condenser (5) is fixed and connected to the collecting cylinder (30). The tube shaft (16) is located on a section of the peripheral wall inside the condenser cylinder (5) and a plurality of condensing plates (26) are fixed thereon. The condensing plates (26) are in the shape of right trapezoids. The plurality of condensing plates (26) are evenly distributed on the peripheral wall of the tube shaft (16) along the circumferential direction. The sloping waist edge of the condensing plate (26) is attached to the inner wall of the condenser cylinder (5) and slides relative to it.

2. The VOC devolatilization device for an extruder according to claim 1, characterized in that: The long side of the condenser plate (26) is fixed on the turntable (60). The end of the sloping waist side of the condenser plate (26) away from the tube shaft (16) is provided with a through hole five (51) that communicates with the cavity structure two (27). The turntable (60) is provided with a through hole six (52) that communicates with the through hole five (51). The end of the straight waist side of the condenser plate (26) near the support (15) is provided with a through hole three (49) that communicates with the cavity structure two (27). The peripheral wall of the tube shaft (16) is provided with a through hole four (50) that communicates with the through hole three (49).

3. The VOC devolatilization device for an extruder according to claim 2, characterized in that: The detachable connection assembly includes a cylinder (48) fixed at the exhaust port of the extruder (1) and a cap (2) connected to the conduit (3). The cap (2) is used to seal the upper end of the cylinder (48). An annular groove (42) is fixed on the inner wall of the cap (2), and a through hole (43) connected to the bottom of the annular groove (42) is opened on the side wall of the cap (2). The port of the through hole (43) facing the outside of the cap (2) is connected to a check valve (44), and the check valve (44) is connected to a suction pipe (14).

4. The VOC devolatilization device for an extruder according to claim 3, characterized in that: The recycling mechanism also includes a pump cylinder (10), inside which a piston plate (22) is slidably connected. A sliding connecting sleeve (20) is fitted on the reciprocating screw (19) and adapted to it. The sleeve (20) is fixedly connected to the piston plate (22) through a connecting rod (21). The bottom of the pump cylinder (10) is connected to a suction pipe (23) and a check valve (34). The suction pipe (23) is connected to a suction pipe (14) and a suction pipe (22) through a three-way pipe (24). The check valve (34) is connected to the collection tank through a discharge pipe (33).

5. The VOC devolatilization device for an extruder according to claim 3, characterized in that: The lower end of the outer peripheral wall of the cap (2) is fixed with an annular protrusion 1 (36). Multiple insert rods (38) are connected through and fixed to the annular protrusion 1 (36). The multiple insert rods (38) are arranged at equal intervals along the circumferential direction of the annular protrusion 1 (36). The outer side of the column (48) is fitted with an annular protrusion 2 (37), an annular frame 2 (46) and a gear ring (40) from top to bottom. The annular protrusion 2 (37) is fixed on the column (48), and a through hole 2 (45) corresponding to the insert rod (38) is opened on the annular protrusion 2 (37). The annular frame 2 (46) is slidably connected to the column (48), and a through hole 8 (61) corresponding to the insert rod (38) is opened on the annular frame 2 (46). The gear ring (40) is rotatably connected to the column (48) on a fixed axis, and a rotating ring (41) is fixed at the lower end of the gear ring (40).

6. The VOC devolatilization device for an extruder according to claim 5, characterized in that: Multiple screws (47) are threaded through and connected to the second ring frame (46). The upper end of the screw (47) is rotatably connected to the bottom surface of the second ring protrusion (37) with a fixed axis. The lower end of the screw (47) is coaxially fixedly connected to a gear (39). The multiple screws (47) are evenly distributed on the second ring frame (46) along the circumferential direction. The multiple gears (39) are respectively meshed with the gear ring (40).

7. The VOC devolatilization device for an extruder according to claim 5, characterized in that: The lower end of the insertion rod (38) has a cavity (55) on its inner side. Two symmetrically arranged slides (56) are provided on the lower side wall of the insertion rod (38), and the slides (56) are connected to the cavity (55). A slide rod (58) is slidably connected in the slide (56), and the opposite ends of the two slide rods (58) are connected by a spring (59). A pull rod (54) is inserted into and slidably connected in the insertion rod (38), and the lower end of the pull rod (54) is located in the cavity (55). The lower end of the pull rod (54) is connected to the two slide rods (58) respectively through two connecting rods (57). The upper ends of the multiple pull rods (54) are all fixedly connected to the ring frame (35).

8. The VOC devolatilization device for an extruder according to claim 1, characterized in that: A vacuum tube (28) is fixedly connected to the side wall of the gathering cylinder (30), and the vacuum tube (28) is inclined upward. A filter screen (29) is fixed on the inner wall of the end of the vacuum tube (28) connected to the gathering cylinder (30). The vacuum tube (28) is connected to the air extraction port of the vacuum pump (6). A second check valve (31) is fixed at the lower end of the gathering cylinder (30). The second check valve (31) is connected to a second suction pipe (32).

Images