CN204322344U - A kind of two rank extruding granulator of high rotating speed high shear high dispersive - Google Patents

Abstract

The utility model discloses a high-speed, high-shear and high-dispersion double-stage extrusion granulator, which includes a first-order single-screw injection system and a second-order twin-screw deep blending extrusion system; the first-order single-screw injection system It is injected into the side feed through the injection head and connected with the second-stage twin-screw deep blending extrusion system. In the first-stage single-screw injection system, a non-return ring is installed on the injection single-screw head; in the second-stage twin-screw deep blending extrusion system, a material flow is provided on the side of the cylinder body, and a recirculation groove is provided on the cylinder for backflow , a melt pump is installed at the discharge port to pump materials; the second-stage twin-screw deep blending extrusion system drives the intermediate gear through the belt, and the intermediate gear simultaneously drives the two screws to realize the synchronous rotation of the two screws in the same direction. The utility model can realize the high speed, high torque and high shear of the screw through the double-stage blending, so as to realize the efficient dispersion of the material, and is especially suitable for the blending and dispersion of the high filling system, which greatly improves the working efficiency and the quality of the material .

Description

A high-speed, high-shear, and high-dispersion two-stage extrusion granulator

technical field

The utility model belongs to the field of modified plastic mechanical equipment, and relates to a high-speed, high-shear and high-dispersion double-stage extrusion granulation equipment, in particular to a double-stage screw method to achieve high Mixing with high dispersion, and then directly extruding and granulating to obtain highly dispersed and uniform modified plastic particles.

Background technique

At present, twin-screw extruders have been widely used in the fields of plastics and rubber, especially the co-rotating parallel twin-screw extruders have excellent mixing effects and high processing efficiency, and are the most effective means for processing modified plastics. The twin-screw extruder can add solid raw materials such as polymer pellets or flakes to the screw part through the feed port, and plasticize the polymer material into a molten state through the combined action of heating and screw extrusion force for standby. Because the twin-screw extruder has better mixing, exhaust and self-cleaning functions than the single-screw extruder, it has been widely used and valued.

For a long time, "high torque, high speed, and high output", which are the main performance indicators of extrusion molding equipment, has been the main direction of extrusion molding machine development, especially the rapid development of polymer nanocomposites puts forward new requirements for extrusion molding equipment. higher requirements. However, the traditional extruder screw is roughly divided into a feeding section, a melting section, a mixing section, an exhaust section, and a metering section. In order to ensure its melting and plasticizing, mixing and dispersing, compacting and extrusion, etc., the screw must ensure sufficient length. Therefore, the rotational speed and torque of the traditional extruder cannot be improved very well, so it is often impossible to effectively achieve uniform mixing and dispersion of materials. At present, there is no precedent for an extruder that can achieve perfect mixing of molten materials.

Contents of the invention

In view of the problems existing in current twin-screw extruders, the purpose of this utility model is to provide a high-speed, high-shear, and high-dispersion two-stage extrusion granulator.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a high-speed, high-shear and high-dispersion two-stage extrusion granulator described in the utility model includes: a first-stage single-screw injection system, a second-stage twin-screw injection system Deep blending extrusion system and circulation blending dispersion system; characterized in that:

The first-stage single-screw injection system includes a machine base, a first-stage drive motor, a first-stage reduction box, a hydraulic cylinder, a feeding device, a screw transmission gear, an injection single screw, an injection machine barrel, an injection system outlet, a First-stage heating system and first-stage exhaust system, the bottom of the casing of the hydraulic cylinder is installed on the base, the first-stage reduction box is installed on the top of the casing of the hydraulic cylinder, the first-stage drive motor is installed on the side of the first-stage reduction box, One end of the injection machine barrel is connected or integrated with the shell of the hydraulic cylinder, and the other end is provided with an injection system outlet, and an injection single screw is arranged in the injection machine barrel, and the injection single screw and the hydraulic cylinder connected to realize hydraulic transmission injection, the injection single screw meshes with the inner tooth groove of the screw transmission gear through the teeth groove, and the screw transmission gear meshes with the first-order drive motor through the first-order reduction box for transmission; the injection machine There is an exhaust system and a feeding device on the barrel. The feeding device includes: a feeding machine, a hopper, a feeding motor and a feeding motor driver, the feeding motor is connected to the feeding motor driver, the feeding motor driver is connected to the feeding machine, and the outlet of the feeding machine Align with the hopper and set; a first-stage heating system is installed outside the barrel of the injection machine;

The second-stage twin-screw deep blending extrusion system includes a machine base, a second-stage drive motor, a transmission belt, a transmission pulley, an intermediate gear, a screw driving gear, a screw driven gear, an extruder screw, and an extruder barrel , a hydraulic chassis, a second-stage reduction box, a second-stage exhaust system and a second-stage heating system, the extruder barrel and the second-stage reduction box are installed on the machine base, and the extruder barrel is fixed on the machine base The second-order bracket support; the second-order drive motor is installed on the base wall, and drives the transmission pulley through the transmission belt, and the transmission pulley drives the intermediate gear located in the second-stage reduction box to rotate through the second-order reduction box, and the intermediate gear drive the screw of the extruder to rotate; the barrel of the extruder is provided with a second-stage exhaust system, and a second-stage heating system is installed outside the barrel of the extruder; the screw of the extruder and the hydraulic pressure in the hydraulic box Cylinder connection;

The circulating blending and dispersing system comprises an extruder barrel, a melt inlet, a circulation outlet, a circulation tank, a circulation inlet, an extruder outlet, a melt outlet pump, and a die Heating mantle and discharge die head, the melt inlet is opened in the middle of the side of the extruder barrel and connected with the outlet of the injection system to realize its side injection feeding; The extruder barrel at the head of the extruder screw is provided with a circulation outlet, which communicates with the extruder outlet provided on the side of the extruder barrel; There is a circulation trough in the middle, one end of the circulation trough communicates with the circulation inlet provided in the middle of the barrel of the extruder, and the other end communicates with the circulation outlet; the outlet of the extruder is installed with a The melt discharge pump realizes the extraction of the melt material from the discharge port of the extruder; the melt discharge pump is equipped with a discharge touch head to realize the extrusion and granulation of the melt material. A die heating jacket is installed to prevent condensation of the material at the discharge port.

The extruder screw in the extruder barrel adopts a driving screw and a driven screw arranged in parallel, and the driving screw and the driven screw are respectively connected with the hydraulic oil cylinder in the hydraulic chassis to realize the axial direction of the driving screw and the driven screw. Movement, the intermediate gear set in the second-stage reduction box meshes with the screw driving gear set on the driving screw and the screw driven gear set on the driven screw at the same time to drive the driving screw and the driven screw synchronously in the same direction turn.

The pitch of the injection single screw decreases gradually.

A non-return ring is installed on the head of the injection single screw to prevent the reverse flow of the material in the barrel cavity.

The notch of the circulation chute of the extruder barrel is larger than that of the circulation outlet, which can store materials and prevent them from overheating.

The driving screw and the driven screw are both cylindrical and detachable screws.

The difference between the utility model and the traditional twin-screw extruder is that the utility model adopts a double-stage twin-screw extruder, and the first stage is a single-screw injection system. The screw pitch of the single-screw injection system is gradually reduced, and the barrel of the single-screw injection system is equipped with an exhaust system, so that the plastic particles will be continuously compacted during the process of melting and propelling. Exhaust gases and volatiles will be discharged through the exhaust system. A non-return ring is installed on the head of the injection single screw to prevent the reverse flow of the material in the barrel cavity. The single-screw injection system uses a hydraulic system to precisely control the output of the material, and injects it into the second-stage twin-screw deep blending extrusion system through the head of the single-screw injection system for deep blending.

The material after the first-stage single-screw injection system is injected into the side feed of the second-stage twin-screw deep blending extrusion system through the injection head, and then deeply blended. The side of the barrel of the twin-screw extruder is provided with a material flow channel, which is relatively matched with the head of the single-screw injection system. The tail of the machine barrel is provided with a circulation outlet. The circulation outlet is divided into two passages, the extruder outlet and the circulation trough, through the circulation channel. The material flow through the discharge port of the extruder is pumped out by the melt pump, passed through the discharge die, and then dragged to granulate. The material passing through the circulation trough returns to the second-stage twin-screw deep blending extrusion system through the circulation feed port. The circulation trough of the barrel is larger than the circulation outlet, which can store materials and prevent them from overheating. The screw pitch of the second-stage twin-screw deep blending extrusion system is gradually reduced, and the material is compacted again during the extrusion process, and the gas and volatiles during the compaction process are discharged through the exhaust system. The twin screws include a driving screw and a driven screw. The second-stage drive motor drives the intermediate gear to rotate through the transmission belt, and the intermediate gear drives the driving screw and the driven screw at the same time. In this way, there will be no breakage of the most vulnerable part of the gear teeth in the transmission process due to excessive torque during the speed-up process. The driving screw passes through the screw driving gear, and the driven screw passes through the screw driven gear, and meshes with the intermediate gear at the same time, so as to realize the synchronous rotation of the two screws in the same direction. A melt pump is installed at the discharge port of the barrel, and a discharge die is installed on the melt pump, and the discharge of the material in the barrel cavity of the twin-screw extruder is realized through the pumping of the melt pump, and then extruded and granulated through the die. . The second-stage twin-screw deep blending extrusion system can realize the longitudinal movement of the twin-screw through the hydraulic system, so that the material can be better sheared. The twin-screws described are cylindrical and detachable twin-screws, and different modules such as kneading discs and screw blocks can be installed accordingly according to the needs of shearing.

The utility model has the advantages that: the utility model adopts the double-stage twin-screw method to replace the traditional single-stage twin-screw method for blending, extrusion and granulation, and a circulation trough is set up to make the materials circulate and blend. Two-stage blending enables the heating section, melting section and compression section of the traditional screw to be carried out in the single-screw injection system, and injected into the second-stage twin-screw deep blending extrusion system in the form of injection; while the blending section is mainly in the In the second-stage twin-screw deep blending extrusion system, the length of the screw can be reduced by half or more compared with the traditional one, and the problems of low speed and low torque faced by the traditional screw extruder can be easily solved. In addition, a circulation trough is set on the twin-screw barrel, so that if the material is not uniformly mixed and dispersed, it can be recycled and remixed until it is evenly mixed. Two-stage granulation not only greatly improves the uniformity of mixing and dispersion of materials, but also reduces the moisture content of materials to a greater extent, making the obtained materials more dense, smooth and full. It integrates the processing procedures of multiple materials and improves work efficiency. , which improves the quality of the material output.

Description of drawings

Fig. 1 is the front view of the utility model structure.

Fig. 2 is an enlarged left view of the second-stage twin-screw deep blending extrusion system in Fig. 1 .

Fig. 3 is an enlarged cross-sectional view of the circulating blending and dispersing system in Fig. 1 .

In Figure 1, 1. Machine base, 2. Discharge die, 3. Die heating jacket, 4. Melt discharge pump, 5. Injection system discharge port, 6. Injection machine barrel, 7. First stage Heating system, 8. Non-return ring, 9. First-stage exhaust system, 10. Injection single screw, 11. Feeding device, 12. First-stage reduction box, 13. First-stage drive motor, 14. Screw transmission gear, 15. hydraulic cylinder.

In Figure 2, 21. Second-stage drive motor, 22. Second-stage bracket, 23. Extruder barrel, 24. Second-stage heating system, 25. Extruder screw, 26. Second-stage exhaust system, 27. Two Step reduction box, 28. transmission pulley, 29. hydraulic chassis, 30. intermediate gear, 31. transmission belt.

In Fig. 3, 41. extruder outlet, 42. circulation trough, 43. circulation inlet, 44. driven screw, 45. screw driven gear, 46. screw driving gear, 47. driving screw, 48. Melt inlet, 49. Circulation outlet.

Detailed ways

As shown in Figure 1, Figure 2 and Figure 3, a high-speed, high-shear and high-dispersion two-stage extrusion granulator described in the utility model mainly includes a first-stage single-screw injection system, a second-stage Twin-screw deep blending extrusion system, circular blending dispersion system.

1) The first-stage single-screw injection system is mainly composed of machine base 1, first-stage drive motor 13, first-stage reduction box 12, hydraulic cylinder 15, feeding device 11, screw transmission gear 14, injection single screw 10, check ring 8, injection Machine barrel 6, injection system outlet 5, primary heating system 7, primary exhaust system 9 and other main components. The bottom of the hydraulic cylinder casing is installed on the base 1, the first-stage reduction box 12 is installed on the top of the hydraulic cylinder casing, the first-stage drive motor 13 is installed on the side of the first-stage reduction box 12, and the injection machine barrel 6 One end is connected or integrated with the hydraulic cylinder casing, the other end is provided with an injection system outlet 5, and an injection single screw 10 is arranged in the barrel 6 of the injection machine, and the injection single screw 10 is connected with the hydraulic cylinder casing. The hydraulic cylinder 15 is connected to realize hydraulic transmission injection. The injection single screw 10 meshes with the internal tooth groove of the screw drive gear 14 through the tooth groove, and the screw drive gear 14 finally connects with the first-stage drive motor 13 through the first-stage reduction box 12 meshing transmission; the barrel 6 of the injection machine is provided with an exhaust system 9 and a feeding device 11, and the feeding device includes: a feeding machine, a hopper, a feeding motor and a charging motor driver; the barrel 6 of the injection machine A first-stage heating system 7 is installed externally. The thread pitch of the injection single screw 10 is gradually reduced, which plays the role of compaction and exhaust; the anti-return ring 8 is installed on the head of the injection single screw 10 .

2) The second-stage twin-screw deep blending extrusion system is mainly composed of machine base 1, second-stage drive motor 21, transmission belt 31, transmission pulley 28, intermediate gear 30, screw driving gear 45, screw driven gear 44, extruder Screw 25, extruder barrel 23, hydraulic chassis 29, secondary reduction box 27, secondary exhaust system 26, secondary heating system 24 and other main components. The extruder barrel 23 and the second-stage reduction box 27 are installed on the machine base 1 , and the extruder barrel 23 is supported and fixed on the machine base 1 by the second-stage bracket 22 . The second-stage driving motor 21 is installed on the wall of the support 1, and drives the transmission pulley 28 through the transmission belt 31, and the transmission pulley 28 drives the intermediate gear 30 to rotate through the second-stage reduction box 27. The extruder barrel 23 is provided with a secondary exhaust system 26 , and the extruder barrel 23 is equipped with a secondary heating system 24 . The extruder screw 25 is connected with the hydraulic cabinet 29 to realize the longitudinal shearing of the second-stage twin-screw deep blending extrusion system. The thread pitch of the extruder screw 25 is gradually reduced, which plays the role of compaction and exhaust, and different modules such as kneading discs and thread blocks can be installed accordingly according to shearing needs. When the extruder screw 25 in the extruder barrel 23 adopts the driving screw 47 and driven screw 44 arranged in parallel, the intermediate gear 30 and the screw driving gear 46 that is located on the driving screw 47 and the screw driving gear 46 that is located on the driven screw 44 The screw driven gear 45 meshes at the same time, thereby simultaneously driving the driving screw 47 and the driven screw 44 to realize the synchronous rotation of the two screws in the same direction.

3) The circulation blending and dispersion system is mainly composed of extruder barrel 23, melt inlet 48, circulation outlet 49, circulation trough 42, circulation inlet 43, extruder outlet 41, melt The discharge pump 4, the die heating sleeve 3, the discharge touch head 2 and other main components are composed. The melt feed port 48 is opened at the middle position of the side of the extruder barrel 23 and connected with the discharge port 5 of the injection molding machine to realize its side injection molding feeding. The said circulation outlet 49 is provided in the extruder barrel 23 located at the head of the extruder screw 25 (when the extruder screw 25 in the extruder barrel 23 adopts the active screw 47 and When the driven screw 44 is used, the circulation outlet 49 is opened in the extruder barrel 23 at the head of the driving screw 47 and the driven screw 44), that is, the extruder at the head of the extruder screw 25 The barrel 23 is provided with a circulation discharge port 49, and the circulation discharge port 49 communicates with the extruder discharge port 41 provided on the side of the extruder barrel 23, that is to say, the head of the extruder screw 25 is set. The circulation discharge port 49 is folded to the side of the extruder barrel 23 and leads to the discharge port 41 of the extruder. A circulation trough 42 is provided in the middle of the extruder barrel, one end of the circulation trough 42 communicates with the circulation inlet 43 provided in the middle of the extruder barrel, and the other end communicates with the circulation outlet 49, so that the circulation The trough 42 is finally returned to the second-stage twin-screw deep blending extrusion system through the circulation feed port 43 for further dispersion and kneading. A melt discharge pump 4 is installed at the discharge port 41 of the extruder to realize the extraction of the melt material. The melt discharge pump 4 is equipped with a discharge touch head 2 to realize extrusion granulation of the melt material, and a die heating jacket 3 is installed on the discharge die head 2 to prevent condensation of the material at the discharge port.

The specific working principle is:

Mix plastic particles and plastic modification additives, etc., and then add them to the feeding device. The materials are fed into the first-stage single-screw injection system driven by the feeding motor, and are rapidly melted under the heating of the first-stage heating system, and then injected. Under the rotation of the single screw 10, it is preliminarily mixed, dispersed and transported forward. During the conveying process, due to the pitch of the injection single screw 10 gradually decreasing, the material is compacted, and the gas originally mixed with it and the gas generated during the melting and kneading process are squeezed out and discharged through the first-stage exhaust system. The material is transported forward to the cavity of the injection machine barrel 6, and the reverse flow of the material is prevented by the check ring 8, waiting for injection. Driven by the hydraulic cylinder, the injection single-screw 10 is pushed forward, injected into the second-stage twin-screw deep blending extrusion system through the injection system outlet 5 and the melt inlet 48, and passed through the extruder barrel. The second-stage heating system conducts heat preservation and heating.

The material entering the second-stage twin-screw deep blending extrusion system is molten material and the screw is short, so the torque on the screw is very small, and the rotation speed can be continuously increased. The material is continuously kneaded, dispersed and conveyed forward under the high-speed rotating second-stage twin-screw deep blending extrusion system. Due to the gradual reduction of the screw pitch of the driving screw 47 and the driven screw 44, the material is conveyed again during the conveying process. After being compacted, the generated gas is discharged through the second-stage exhaust system, and then enters the circulation trough through the circulation outlet, and then enters the second-stage twin-screw deep blending extrusion system through the circulation inlet for further mixing and dispersion. Therefore, the melt discharge pump is not turned on at this time, so the material will not flow out from the discharge port of the extruder. After the material is mixed and dispersed, the melt discharge pump is turned on to pump out the material, extruded through the discharge die, and then pulled to granulate. The kneading block can be properly installed in the driving screw 47 and the driven screw 44 according to the shearing needs, and the driving screw 47 and the driven screw 44 can also open the hydraulic cabinet according to the shearing needs to perform longitudinal shearing movement during the rotation process; The material mixing and dispersing effect requirements can be met by controlling the rotating speed of the driving screw 47 and the driven screw 44 and the material mixing time.

The above-mentioned specific implementation methods and accompanying drawings are a further detailed description of the application of the utility model, but the scope of protection of the claims of the utility model is not limited to the scope described in the implementation mode, and any technical solution that adopts equivalent replacement or equivalent deformation , all fall within the scope of protection of the utility model claims.

Claims (1)

1. two rank extruding granulator of high rotating speed high shear high dispersive, comprising: single order singe screw injecting systems, second order twin-screw degree of depth blending extrusion system and the blended decentralized system that circulates; It is characterized in that:

Described single order singe screw injecting systems, comprise support (1), single order drive motors (13), single order reduction box (12), hydraulic cylinder (15), feeding device (11), screw drive gear (14), injection singe screw (10), injector machine barrel (6), injecting systems discharging opening (5), single order heating system (7) and single order gas extraction system (9), the bottom of the shell of described hydraulic cylinder (15) is arranged on support (1), single order reduction box (12) is arranged on the top of the shell of hydraulic cylinder (15), single order drive motors (13) is arranged on single order reduction box (12) side, described injector machine barrel (6) one end is connected with the shell of hydraulic cylinder (15) or makes one, the other end is provided with injecting systems discharging opening (5), injection singe screw (10) is provided with in injector machine barrel (6), described injection singe screw (10) is connected with hydraulic cylinder (15), realize hydraulic drive injection, described injection singe screw (10) is engaged with the internal tooth tooth groove of screw drive gear (14) by teeth teeth groove, screw drive gear is by single order reduction box (12) and single order drive motors (13) engaged transmission, described injector machine barrel (6) offers gas extraction system (9) and feeding device (11), described feeding device comprises: charger, hopper, reinforced motor and reinforced motor driver, reinforced motor connects reinforced motor driver, reinforced motor driver connects charger, and the discharging opening of charger is aimed at hopper and arranged, described injector machine barrel (6) outside is provided with single order heating system (7),

Described second order twin-screw degree of depth blending extrusion system, comprise support (1), second order drive motors (21), driving belt (31), driving pulley (28), idler gear (30), screw drive gear (45), screw rod driven gear (44), extruder screw, extruder barrel (23), hydraulic pressure cabinet (29), second order reduction box (27), second order gas extraction system (26) and second order heating system (24), described extruder barrel (23) and second order reduction box (27) are arranged on support (1), extruder barrel (23) is supported by the second order support (22) be fixed on support (1), described second order drive motors (21) to be installed on support (1) wall and to drive driving pulley (28) by driving belt (31), driving pulley (28) drives the idler gear (30) be located in second order reduction box (27) to rotate through second order reduction box (27), and idler gear (30) drives extruder screw (25) to rotate, described extruder barrel (23) offers second order gas extraction system (26), and extruder barrel outside is provided with second order heating system (24), described extruder screw (25) is connected with the hydraulic jack in hydraulic pressure cabinet (29),

The blended decentralized system of described circulation comprises extruder barrel (23), melt charging aperture (48), circulation discharging opening (49), circulation material trough (42), recycle feed mouth (43), extruder discharging mouth (41), melt discharging pump (4), mouth mould heating jacket (3) and discharging die head (2), described melt charging aperture (48) is opened in the side middle position of extruder barrel (23) and is connected with injecting systems discharging opening (5), realizes its side injection moulding feeding; The described extruder barrel (23) being positioned at the head place of extruder screw (25) is provided with circulation discharging opening (49), and the extruder discharging mouth (41) that circulation discharging opening (49) and the side of extruder barrel (23) are provided with is communicated with; Offer a circulation material trough (42) in the middle of extruder barrel (23), circulation material trough (42) one end is communicated with the recycle feed mouth (43) be provided with in the middle part of extruder barrel, the other end is communicated with circulation discharging opening (49); A melt discharging pump (4) is installed at described extruder discharging mouth (41) place, realizes the extraction of melt material from extruder discharging mouth (41); Described melt discharging pump (4) place is provided with discharging and gets to know (2), realizes the extruding pelletization of melt material, discharging die head (2) is provided with a mouthful mould heating jacket (3), prevents the condensation of discharging opening material.

2. two rank extruding granulator of a kind of high rotating speed high shear high dispersive according to claim 1, it is characterized in that: the extruder screw (25) in described extruder barrel (23) adopts the active screw rod (47) and driven screw (44) that be arranged in parallel, described active screw rod (47) and driven screw (44) are connected the axially-movable realizing initiatively screw rod (47) and driven screw (44) respectively with the hydraulic jack in hydraulic pressure cabinet (29), the idler gear (30) be located in second order reduction box (27) engages with the screw drive gear (46) be located in active screw rod (47) and the screw rod driven gear (45) be located on driven screw (44) simultaneously and can drive the synchronous rotating in same direction of initiatively screw rod (47) and driven screw (44) simultaneously.

3. two rank extruding granulator of a kind of high rotating speed high shear high dispersive according to claim 1 and 2, is characterized in that: the pitch of described injection singe screw is for reduce gradually.

4. two rank extruding granulator of a kind of high rotating speed high shear high dispersive according to claim 1 and 2, is characterized in that: the head of described injection singe screw (10) is provided with check ring, prevents material adverse current in cylinder chamber.

5. two rank extruding granulator of a kind of high rotating speed high shear high dispersive according to claim 1 and 2; it is characterized in that: the notch of the circulation material trough (42) in described extruder barrel (23) is larger than the material mouth of circulation discharging opening (49), can play the effect storing material and prevent material overheated.

6. two rank extruding granulator of a kind of high rotating speed high shear high dispersive according to claim 2, is characterized in that: described active screw rod (47) and driven screw (44) are column type and detachable screw rod.