Continuous mixing, extruding and granulating unit

Abstract

A continuous mixing and extruding granulation unit comprises a feeding system, a melting mixing system, an extruding granulation system and a particle post-processing system, the feeding system comprises a stock bin, the melting mixing system comprises a driving end supporting piece, a water end supporting piece and a combined machine barrel, the combined machine barrel comprises a feeding machine barrel, a middle machine barrel and a discharging machine barrel, and a conveying screw penetrates through the feeding machine barrel. The extrusion granulation system comprises a melt gear pump, a screen exchanger, a machine head template and a granulator which are connected in sequence; the particle post-treatment system comprises a water tank, a water powder sieve, a plate heat exchanger, a drying machine and a vibrating screen. The utility model adopts a design mode that mixing and extruding granulation are divided into two sections, is reasonable in layout, convenient to install, intelligent and high in safety, facilitates improvement of production efficiency and realization of automatic control, is not easy to pollute workshops, reduces the labor intensity of workers, can realize the material yield of not less than 100,000 tons per year, and reduces the production cost compared with the existing small-sized unit. And the performance requirements of a continuous mixing and extruding granulation unit are met.

Description

Technical Field

[0001] The utility model relates to the field of mixing, extruding and granulating devices, in particular to a continuous mixing, extruding and granulating unit. Background Art

[0002] The mixing, extrusion and granulation unit can mix, plasticize, extrude, pelletize, separate and dry the materials, and finally process them into regular granular products. It mainly consists of metering, feeding and mixing systems, melt mixing systems, extrusion granulation systems and granule post-processing systems. At present, most of the twin-screw extruder units needed in China are still imported, and only some small units have been developed. Moreover, in terms of the unit's working principle, automatic control, performance parameters, technical complexity, manufacturing difficulty, reliability requirements, electrical control and protection, etc., it is difficult to meet the continuous and efficient automated production requirements of the continuous mixing, extrusion and granulation unit. Utility Model Content

[0003] The purpose of the utility model is to provide a continuous mixing, extruding and granulating machine unit, which is convenient for improving production efficiency and realizing automatic control, and achieving a material output of no less than 100,000 tons / year.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a continuous mixing extrusion granulation unit, comprising a feeding system, a melt mixing system, an extrusion granulation system and a particle post-processing system, the feeding system comprising a cylindrical silo, the side wall of the silo is connected with a feeding pipe, the feeding pipe is inclined and the top is connected with a feeding hose, the bottom of the silo is provided with a gradient section, the small end of the gradient section is downwardly facing and provided with a long strip-shaped discharge port, the discharge port is connected to the mixing system through a canvas soft connection, the side wall of the gradient section is provided with an observation window and is connected with a nitrogen purge pipe, the nitrogen purge pipe can blow away the material covering the observation window in the silo, the end cover at the top of the silo is connected with an exhaust hose, the end cover is also provided with an additive inlet and a high-level material level gauge installation port, the side wall of the gradient section is also provided with a manual discharge port and a low-level material level gauge installation port, the high-level material level gauge installation port and the low-level material level gauge installation port are respectively provided with a material level gauge extending into the silo;

[0005] The melt mixing system includes a driving end support, a water end support and a combined barrel. The combined barrel includes a feed barrel, a middle barrel and a discharge barrel connected in the axial direction. The feed barrel is connected to the driving end support, and the discharge barrel is connected to the water end support. The insides of the feed barrel, the middle barrel and the discharge barrel are matched to form an axially through mixing chamber. Two conveying screws are passed through the mixing chamber. The two ends of the conveying screws are respectively installed on the driving end support and the water end support through bearings. The feed port of the feed barrel is connected to the discharge port of the silo through a canvas soft connection. The insides of the feed barrel, the middle barrel and the discharge barrel are all provided with a heating element surrounding the mixing chamber. The flow channel and the heating flow channel are connected to the mixing system pipeline assembly so as to heat the material in the mixing chamber to a molten state. One end of the conveying screw extends from the driving end support and is connected to the main motor through a reducer so as to drive the material from the feed barrel to the discharge barrel through the conveying screw. The mixing system pipeline assembly is also connected to the water end support so as to input cooling water to the water end support and cool the conveying screw. A throttle valve for controlling the material flow is installed on the middle barrel, a discharge port is opened on the side wall of the discharge barrel, a discharge port is opened on the bottom side of the discharge barrel, and a discharge valve for switching the discharge port on or off is also installed on the discharge barrel;

[0006] The extrusion granulation system includes a melt gear pump, a screen changer, a head template and a pelletizer connected in sequence, the discharge port of the discharging barrel is connected to a transition connector, and the transition connector is also connected to the inlet of the melt gear pump, the melt gear pump can transport the material to the screen changer through two gear shafts, and make the material flow to the head template after passing through the filter component in the screen changer, the melt gear pump and the screen changer are also connected to the extrusion granulation system pipeline assembly to facilitate the transportation of cooling water and heating medium to the melt gear pump and the screen changer; the head template cover is arranged at the inlet of the water chamber of the pelletizer, and the side of the water chamber away from the head template is provided with an auxiliary motor, the auxiliary motor is connected to the knife shaft extending into the water chamber, and the end of the knife shaft is equipped with a knife disk matching the head template, the water chamber is provided with a water inlet and a water outlet, and the circulating water flowing in through the water inlet can transport the material that passes through the head template and is cut into granules by the knife disk from the water outlet to the particle post-processing system;

[0007] The particle post-processing system includes a water tank, a gouache screen, a plate heat exchanger, a dryer and a vibrating screen. A water pump is installed on the water outlet pipe of the water tank. The water pump can transport the circulating water in the water tank to the plate heat exchanger, and the cooled circulating water is transported to the water chamber through the plate heat exchanger. The dryer can separate material particles from the circulating water sent out of the water chamber and transport the material particles to the vibrating screen. The circulating water separated by the dryer is transported to the gouache screen through the water inlet pipe. The gouache screen is installed on the top of the water tank. The bottom side of the gouache screen and the top side of the water tank are equipped with a return pipe to facilitate the circulation water after screening to flow back to the water tank.

[0008] Preferably, the side wall of the gradual transition section of the silo is further provided with a reserved opening.

[0009] Preferably, the water tank is provided with a steam inlet, a water supply inlet, a cleaning water inlet and a drain outlet.

[0010] According to the above technical solution, the beneficial effects of the utility model are:

[0011] The continuous mixing and extrusion granulation unit of the utility model adopts a design method in which mixing and extrusion granulation are divided into two sections, which reduces screw wear and extends service life. It has a reasonable layout, is easy to install, safe and reliable, has clear control, simple operation, intelligence, and high safety. Compared with existing miniaturized units, it is easy to improve production efficiency and realize automatic control, is not easy to pollute the workshop and reduce the labor intensity of workers, and can achieve a material output of no less than 100,000 tons / year, meeting the performance requirements of the continuous mixing and extrusion granulation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the feeding system, mixing system and extrusion granulation system;

[0013] Figure 2 is a schematic diagram of the feeding system;

[0014] Figure 3 Schematic diagram of the mixing system, in which the conveying screw is shown outside the barrel;

[0015] Figure 4 Schematic diagram of the extrusion granulation system;

[0016] Figure 5 This is a schematic diagram of a circulating water system. The side panels of the water-powder screen are not shown in the figure.

[0017] Markings in the figure: 1. Silo, 2. Feed pipe, 3. Exhaust hose, 4. Feeding hose, 5. Nitrogen purge pipe, 6. Canvas soft connection, 7. Observation window, 8. Reserved port, 9. Low level meter installation port, 10. Manual discharge port, 11. High level meter installation port, 12. Additive inlet, 13. Drive end support, 14. Feed barrel, 15. Middle barrel, 16. Throttle valve, 17. Discharge barrel, 18. Water end support, 19. Conveying screw, 20. Mixing system piping assembly, 21. Transition connector, 22. Melt gear pump, 23. Screen changer, 24. Extrusion granulation system piping assembly, 25. Die template, 26. Water chamber, 27. Pelletizer, 28. Water tank, 29. Water powder sieve, 30. Water inlet pipe, 31. Water pump, 32. Drain port, 33. Steam inlet, 34. Water supply port, 35. Cleaning water port, 36. Return pipe, 37. Discharge valve.

[0018] Plate heat exchanger, centrifugal dryer, vibrating screen DETAILED DESCRIPTION

[0019] With reference to the accompanying drawings, the specific implementation is as follows:

[0020] like Figure 1 As shown in FIG, a continuous mixing extrusion granulation unit includes a feeding system, a melt mixing system, an extrusion granulation system and a particle post-processing system. Figure 2 As shown, the feeding system includes a cylindrical silo 1, the side wall of the silo 1 is connected to a feeding pipe 2, the feeding pipe 2 is inclined and the top is connected to a feeding hose 4, the bottom of the silo 1 has a gradient section, the small end of the gradient section faces downward and is provided with a long strip of discharge port, the discharge port is connected to the mixing system through a canvas soft connection 6, the side wall of the gradient section is provided with an observation window 7 and is connected to a nitrogen purge pipe 5, the nitrogen purge pipe 5 can blow away the material covering the observation window 7 in the silo 1, the end cover on the top of the silo 1 is connected to an exhaust hose 3, the end cover is also provided with an additive inlet 12 and a high-level material level meter installation port 11, the side wall of the gradient section is also provided with a manual discharge port 10, a low-level material level meter installation port 9 and a reserved port 8, the high-level material level meter installation port 11 and the low-level material level meter installation port 9 are respectively installed with material level meters extending into the silo 1. As the material is conveyed, the material level in silo 1 gradually rises until the high-level material level meter signal is triggered, and the material input is stopped. The raw materials continue to enter the mixing system from the discharge port, and the material level decreases until the low-level material level meter signal is triggered, and the material is conveyed into silo 1 again, realizing automatically controlled cyclic feeding.

[0021] like Figure 1 、 3 As shown, the melt mixing system includes a driving end support 13, a water end support 18 and a combined barrel, the combined barrel includes a feed barrel 14, a middle barrel 15 and a discharge barrel 17 connected in the axial direction, the feed barrel 14 is connected to the driving end support 13, the discharge barrel 17 is connected to the water end support 18, the feed barrel 14, the middle barrel 15 and the discharge barrel 17 are internally cooperated to open an axially through mixing chamber, two conveying screws 19 are passed through the mixing chamber, the two ends of the conveying screw 19 are respectively mounted on the driving end support 13 and the water end support 18 through bearings, the feed port of the feed barrel 14 is connected to the discharge port of the silo 1 through a canvas soft connection 6, the feed barrel 14, the middle barrel 15 and the discharge barrel 17 are internally provided with a heating flow channel surrounding the mixing chamber, the heating flow channel is connected to the mixing system pipeline assembly 20, so as to heat the material in the mixing chamber to a molten state.

[0022] One end of the conveying screw 19 extends from the driving end support 13 and is connected to the main motor through a reducer, so that the material is driven by the conveying screw 19 to flow from the feed barrel 14 to the discharge barrel 17. The mixing system pipeline assembly 20 is also connected to the water end support 18 to input cooling water into the water end support 18 and cool the conveying screw 19. A throttle valve 16 for controlling the material flow rate is installed on the middle barrel 15, and a discharge port is provided on the side wall of the discharge barrel 17. A discharge port is provided on the bottom side of the discharge barrel 17. A discharge valve 37 for switching the discharge port open or closed is also installed on the discharge barrel 17. When the discharge valve 37 closes the discharge port, the material flows out of the discharge barrel 17 from the discharge port. When the discharge valve 37 opens the discharge port, the material is discharged directly from the discharge port.

[0023] like Figure 1 、 4 As shown, the extrusion granulation system includes a melt gear pump 22, a screen changer 23, a head template 25 and a pelletizer 27 connected in sequence. The discharge port of the discharge barrel 17 is connected to a transition connector 21, and the transition connector 21 is also connected to the inlet of the melt gear pump 22. The melt gear pump 22 can transport the material to the screen changer 23 through two gear shafts, and allow the material to pass through the filter component in the screen changer 23 and flow to the head template 25. The filter component in the screen changer 23 can be replaced without stopping the machine. The melt gear pump 22 and the screen changer 23 are also connected to the extrusion granulation system pipeline component 24 to facilitate the transportation of cooling water and heating medium to the melt gear pump 22 and the screen changer 23.

[0024] like Figure 4 As shown, the head template 25 is covered on the feed port of the water chamber 26 of the pelletizer 27. An auxiliary motor is provided on the side of the water chamber 26 away from the head template 25. The auxiliary motor is connected to the knife shaft extending into the water chamber 26. The end of the knife shaft is equipped with a knife disc that cooperates with the head template 25. The water chamber 26 is provided with a water inlet and a water outlet. Circulating water flows in through the water inlet. After passing through the head template 25, the material will form a long strip and be cut into granules by the knife disc. The granular material is transported from the water outlet to the particle post-processing system through circulating water.

[0025] like Figure 5As shown, the particle post-processing system includes a water tank 28, a water powder screen 29, a plate heat exchanger, a dryer, and a vibrating screen. A water pump 31 is installed on the outlet pipe of the water tank 28. The water pump 31 can transport the circulating water in the water tank 28 to the plate heat exchanger, and the cooled circulating water is transported to the water chamber 26 through the plate heat exchanger. The water tank 28 is also equipped with a steam inlet 33, a water replenishment port 34, a cleaning water port 35, and a drain port 32. The steam inlet 33 is used to pass hot steam to heat the water tank 28. The drain port 32 is used when inspecting and cleaning the water tank 28, and the cleaning water port 35 is used when cleaning the water pump. The dryer can separate the material particles from the circulating water sent from the water chamber 26 and transport the material particles to the vibrating screen, which vibrates and screens out qualified and unqualified particles. The circulating water separated by the dryer is transported to the water powder screen 29 through the water inlet pipe 30. The water powder screen 29 is installed on the top of the water tank 28. The bottom side of the water powder screen 29 and the top side of the water tank 28 are equipped with a return pipe 36 to facilitate the circulation water after screening to flow back to the water tank 28, and the screened powder is discharged as waste.

[0026] When this embodiment is working, the hopper mixes and automatically weighs the materials, including the main material and auxiliary materials. The main motor device starts at a low speed, the main reducer runs at a low speed, and the conveying screw runs at a low speed to discharge the residual waste materials in the barrel through the discharge valve device. After confirming that there is no residual waste material, the main motor device increases the speed, the main reducer runs normally, and the feeding starts at the same time. Under the action of the conveying screw, the material is melted, plasticized, sheared, pressurized, and conveyed to the discharge valve device and the throttle valve to form a stable melt flow, enter the melt gear pump for further plasticization, stabilization, and increase of melt pressure, and then enter the screen changer for filtration. The filtered melt enters the head template and is divided into thousands of melt strips. At the moment of entering the pelletizer, the surface of the melt strip will be cooled by warm process water and the surface will be slightly hardened. The cutter cuts the pellets into millions of small particles. Because the pellets are processed in a sealed water chamber, they do not adhere to each other and are washed by the water flow into a centrifugal dryer, which separates the process water and pellet mixture. The process water then returns to the underwater pelletizing unit for new pelletizing. The separated particles are then piped to a vibrating screen. Vibrating, screening, and air drying the screen break them down into large, medium, and small pellets to meet pellet product standards. The pellets are then transported by an air conveyor system to a finished product silo. The circulating water, after separation, enters a water-powder screen for screening and preparation for a new water cycle. The entire mixing, extrusion, and granulation process takes place under conditions of high temperature, high pressure, high speed, high torque, high output, high flow rate, high wear, high corrosion, high voltage, and high current, ensuring the safe and stable production of continuous mixing, extrusion, and granulation units exceeding 100,000 tons per year.

Claims

1. A continuous mixing extrusion granulation unit, characterized by: The invention comprises a feeding system, a melt mixing system, an extrusion granulation system and a particle post-processing system, wherein the feeding system comprises a cylindrical silo (1), the side wall of the silo (1) is connected to a feeding pipe (2), the feeding pipe (2) is inclined and the top end is connected to a feeding hose (4), the bottom of the silo (1) has a gradient section, the small end of the gradient section faces downward and is provided with a long strip-shaped discharge port, the discharge port is connected to the mixing system through a canvas soft connection (6), the side wall of the gradient section is provided with an observation window (7) and is connected A nitrogen purge pipe (5) is provided, and the nitrogen purge pipe (5) can blow away the material covering the observation window (7) in the silo (1). The end cover at the top of the silo (1) is connected to an exhaust hose (3). The end cover is also provided with an additive inlet (12) and a high-level material level meter installation port (11). The side wall of the gradient section is also provided with a manual discharge port (10) and a low-level material level meter installation port (9). The high-level material level meter installation port (11) and the low-level material level meter installation port (9) are respectively provided with material level meters extending into the silo (1); The melt mixing system includes a drive end support (13), a water end support (18) and a combined barrel. The combined barrel includes a feed barrel (14), a middle barrel (15) and a discharge barrel (17) connected in the axial direction. The feed barrel (14) is connected to the drive end support (13), and the discharge barrel (17) is connected to the water end support (18). The feed barrel (14), the middle barrel (15) and the discharge barrel (17) are internally provided with an axially through mixing chamber. Two conveying screws (19) are provided in the mixing chamber. The two ends of the conveying screw (19) are respectively mounted on the drive end support (13) and the water end support (18) through bearings. The feed port of the feed barrel (14) is connected to the discharge port of the silo (1) through a canvas soft connection (6). The feed barrel (14), the middle barrel (15) and the discharge barrel (17) are internally provided with an axially through mixing chamber. A heating flow channel surrounding the mixing chamber is provided, and the heating flow channel is connected to the mixing system pipeline assembly (20) so as to heat the material in the mixing chamber to a molten state. One end of the conveying screw (19) extends from the driving end support (13) and is connected to the main motor through a reducer so as to drive the material from the feed barrel (14) to the discharge barrel (17) through the conveying screw (19). The mixing system pipeline assembly (20) is also connected to the water end support (18) so as to input cooling water to the water end support (18) and cool the conveying screw (19). A throttle valve (16) for controlling the flow of material is installed on the middle barrel (15). A discharge port is provided on the side wall of the discharge barrel (17). A discharge port is provided on the bottom side of the discharge barrel (17). A discharge valve (37) for switching the discharge port on or off is also installed on the discharge barrel (17). The extrusion granulation system includes a melt gear pump (22), a screen changer (23), a die plate (25) and a pelletizer (27) connected in sequence. The discharge port of the discharge barrel (17) is connected to a transition connector (21). The transition connector (21) is also connected to the inlet of the melt gear pump (22). The melt gear pump (22) can transport the material to the screen changer (23) through two gear shafts, and make the material flow to the die plate (25) after passing through the filter component in the screen changer (23). The melt gear pump (22) and the screen changer (23) are also connected to the extrusion granulation system pipeline component (24). ) is connected so as to facilitate the delivery of cooling water and heating medium to the melt gear pump (22) and the screen changer (23); the die template (25) is covered at the inlet of the water chamber (26) of the pelletizer (27), and a secondary motor is provided on the side of the water chamber (26) away from the die template (25), and the secondary motor is connected to the knife shaft extending into the water chamber (26), and a knife disk matching the die template (25) is installed at the end of the knife shaft. The water chamber (26) is provided with a water inlet and a water outlet, and the circulating water flowing in through the water inlet can transport the material that passes through the die template (25) and is cut into granules by the knife disk from the water outlet to the particle post-processing system; The particle post-processing system includes a water tank (28), a water powder screen (29), a plate heat exchanger, a dryer and a vibrating screen. A water pump (31) is installed on the water outlet pipe of the water tank (28). The water pump (31) can transport the circulating water of the water tank (28) to the plate heat exchanger, and the cooled circulating water is transported to the water chamber (26) through the plate heat exchanger. The dryer can separate material particles from the circulating water sent out of the water chamber (26) and transport the material particles to the vibrating screen. The circulating water separated by the dryer is transported to the water powder screen (29) through the water inlet pipe (30). The water powder screen (29) is installed on the top of the water tank (28). The bottom side of the water powder screen (29) and the top side of the water tank (28) are equipped with a return pipe (36) to facilitate the circulation water after screening to flow back to the water tank (28).

2. The continuous mixing extrusion granulation unit according to claim 1, characterized in that: The side wall of the gradual transition section of the silo (1) is also provided with a reserved opening (8).

3. The continuous mixing extrusion granulation unit according to claim 1, characterized in that: The water tank (28) is provided with a steam inlet (33), a water supply port (34), a water cleaning port (35) and a water discharge port (32).

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