CN206825879U - Height is than moment of torsion augmentation of heat transfer with being kneaded plasticizing extruder - Google Patents

Abstract

The utility model discloses a high specific torque enhanced heat transfer and mixing plasticizing extruder, which mainly includes a frame, a reduction box, a feeding device, a barrel, an active plasticizing part, a gear pump, a driven mixing part, and a machine head , motor, heating and cooling parts and control system, etc. The active plasticizing part and the driven mixing part are connected by a gear pump, and the active plasticizing part is mainly composed of a spline hole screw element and a spline mandrel. Multiple building blocks The spline hole screw element is connected in series on the spline mandrel to form the active plasticizing part screw; the driven mixing part is mainly composed of a cylindrical hole screw element and a cylindrical mandrel, and multiple building block cylindrical hole screw elements are connected in series on the cylindrical mandrel. The screw rod of the driven mixing part, and the two ends of the cylindrical mandrel are respectively fixed at the gear pump and the machine head. The utility model can significantly increase the screw torque and the length-to-diameter ratio of the screw by introducing driven mixing, improve the heat transfer and mixing and plasticizing effects of the extruder, and obtain extruded products with higher quality and greater output.

Description

High specific torque enhanced heat transfer and mixing plasticizing extruder

technical field

The invention relates to a plastic extrusion molding device, in particular to a high specific torque extruder capable of enhancing heat transfer and mixing and plasticizing.

Background technique

The aspect ratio of the extruder screw is the ratio of the length L of the screw to the diameter D of the screw. Generally speaking, the larger the length-to-diameter ratio of the extruder screw, the longer the thermal history of the polymer, the better the plasticizing quality, and the higher the output. Under the condition that the screw speed n is constant, the length-to-diameter ratio increases, which means that the movement time of the material in the screw increases, which is beneficial to the plasticization and mixing of plastics, reduces the counterflow and leakage of molten materials, and improves production capacity. However, due to the limitation of the torque that the screw can withstand, the length-to-diameter ratio of the screw cannot be increased infinitely. If the length-to-diameter ratio is too long, the lower the speed that can withstand, the lower the viscosity of the material, and the screw is prone to twisting.

Since the advent of the extruder, the screw aspect ratio has experienced a process of gradually increasing. The length-to-diameter ratio of the early extruder screw was small, only 12-16. With the development of the plastic molding processing industry, the length-to-diameter ratio of the extruder screw gradually increased. Currently, the commonly used ones are 15, 20, 25, 28, etc. , up to 43. Increasing the length-to-diameter ratio has many advantages, such as: the screw is fully pressurized, and the physical and mechanical properties of the product can be improved; the material is well plasticized, and the appearance quality of the product is better; the extrusion rate is increased by 20-40%. At the same time, the slope of the characteristic curve of the screw with a large length-to-diameter ratio is small, relatively flat, and the extrusion volume is stable; it is conducive to powder molding, such as PVC powder extrusion.

The patent "Ultra-large aspect ratio twin-screw granulation equipment" (Patent No.: 201020680116.1) involves a super-large aspect ratio conical twin-screw extruder, but the patent only mentions the effective length of the two conical screws The ratio is 25 to 95:1, and it is not clear how to achieve a larger aspect ratio. At present, we mainly start with the material of the screw and mandrel, and select materials with higher torque bearing capacity to achieve high torque of the screw, thereby increasing the length-to-diameter ratio of the screw. For example, Nanjing Keya Company adopts a non-standard involute spline design with higher load-bearing torque and more convenient assembly and disassembly on the screw and mandrel to achieve high speed, high torque and high output of the twin-screw extruder. However, due to the limitations of the material itself, the difficulty in screw processing, and the inconvenient installation of the screw and barrel, the increase in the length-to-diameter ratio of the screw is limited.

Contents of the invention

The purpose of the present invention is to provide a high specific torque enhanced heat transfer and mixing and plasticizing extruder, which can significantly increase the screw torque and screw length-to-diameter ratio, and improve the heat transfer and mixing and plasticizing of the extruder. The effect is to obtain higher-quality, higher-yield extruded products.

The technical solution of the present invention is a high specific torque enhanced heat transfer and mixing plasticizing extruder, which mainly includes a frame, a reduction box, a feeding device, a machine barrel, an active plasticizing part, a gear pump, a driven mixing part, a machine Head, motor, heating and cooling parts, control system, etc. The active plasticizing part and the driven mixing part are connected by a gear pump. The function of the gear pump is to transport the plasticized melt of the active plasticizing part to the Driven mixing components. Among them, the active plasticizing part is mainly composed of a spline hole screw element and a spline mandrel. Multiple building block type spline hole screw elements are connected in series on the spline mandrel to form the active plasticizing part screw. The end of the spline mandrel is connected to the deceleration The box is connected, and the torque is transmitted to the screw mandrel through the speed reduction of the reduction box through the rotation of the motor, and then drives the screw rotation of the active plasticizing part to promote the plasticization and forward transportation of the material. The driven mixing part is mainly composed of a cylindrical hole screw element, a cylindrical mandrel, and a plurality of building block cylindrical hole screw elements, such as enhanced dispersion and mixing screw elements (such as separation type, shunt type, etc. screw configuration), enhanced heat transfer elements etc., connected in series on the cylindrical mandrel to form the driven mixing component screw, and the two ends of the cylindrical mandrel are respectively fixed at the gear pump and the machine head. After the polymer is plasticized by the active plasticizing part, it is transported to the driven mixing part through the gear pump. Driven by the flow of the polymer melt itself, the cylindrical hole screw element in the driven mixing part is driven on the cylindrical mandrel. Rotating, while rotating, it further drives the polymer melt to mix, plasticize and convey forward.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the plasticizing part is realized by two parts: active plasticizing and driven mixing. The active plasticizing part drives the screw of the active plasticizing part to rotate by the motor through the gearbox, and the driven mixing part indirectly drives the screw of the driven mixing part to rotate through the material flow. Therefore, the cylindrical mandrel of the driven mixing part does not need to bear torque, and the length-to-diameter ratio of the screw is not limited; while the screw length of the active plasticizing part is short and can be used to bear high torque. The invention is not only applicable to multi-screw extruders such as twin-screws, but also applicable to single-screw extruders.

The high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the active plasticizing part and the driven mixing part are connected by a gear pump, and the function of the gear pump is to reduce the plasticized melt of the active plasticizing part Large flows are delivered to driven mixing elements. In the case of sufficient flow, the gear pump may not be used. The active plasticizing part is directly connected to the driven mixing part. The cylindrical mandrel of the driven mixing part is fixed directly to the splined mandrel of the active plasticizing part. The spline hole screw element in the active plasticizing part is connected in series to the spline mandrel of the active plasticizing part, and the cylindrical hole screw element in the driven mixing part is connected in series to the cylindrical mandrel of the driven mixing part.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the connection scheme between the cylindrical mandrel and the spline mandrel and the machine head can be, the connection between the cylindrical mandrel and the spline mandrel is, the spline core Shaft opening, relative rotation between cylindrical mandrel and spline mandrel through thrust bearing, elastic retaining ring limit, end cover and seal ring seal, end cover and spline mandrel are connected by bolts, thrust bearing The end cover and the shaft shoulder of the splined mandrel are positioned, the thrust bearing is used to bear the axial force, and a sealing ring is provided between the end cover and the cylindrical mandrel for sealing; similarly, the connection between the cylindrical mandrel and the machine head is, shunt There is a hole in the center of the plate, and the cylindrical mandrel extends into the hole of the manifold, and the relative rotation occurs through the thrust bearing, the end cover and the sealing ring are sealed, the end cover and the manifold are connected by bolts, and the thrust bearing is close to the center hole of the end cover and the manifold The shaft shoulder is positioned, and a sealing ring is provided between the end cover and the cylindrical mandrel for sealing.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, one end of each screw element end face of the driven mixing part is grooved, and a boss is arranged at one end, and adjacent screw elements are bonded to each other through the groove and the boss, which changes the In the form of torque transmission, the spline transmission between the traditional mandrel and the screw element is changed to the keying transmission between the end faces of the screw element, which can effectively solve the problem that the spline mandrel is easy to twist.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the end face bonding form of each screw element in the driven mixing part may be "cross" bonding or other forms. The cross-shaped bonding form is mainly to set a cross-shaped boss and a cross-shaped groove on the two ends of the screw element respectively, and insert the cross-shaped boss of one screw element into the cross-shaped groove of the adjacent screw element, and so on to form a screw The string, together with the cylindrical mandrel, constitutes the driven mixing element screw.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the active plasticizing part can be in the form of a barrel with internal spiral grooves and a screw with long grooves to obtain good heat transfer plasticizing and conveying capabilities.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the cylindrical mandrel in the driven mixing part may also be a flexible mandrel such as a chain or a steel wire rope.

The beneficial effects of the present invention are: by introducing driven mixing, the screw torque and screw length-to-diameter ratio can be significantly improved, satisfying the increasingly complex special extrusion such as reaction extrusion molding, and improving the heat transfer and mixing and plasticizing effects of the extruder , to obtain higher quality, larger output extrusion molding products.

Description of drawings

Fig. 1 is a schematic diagram of the whole machine of the high specific torque enhanced heat transfer and mixing and plasticizing extruder of the present invention;

Fig. 2 is the screw mandrel of the high specific torque enhanced heat transfer and mixing and plasticizing extruder not using the gear pump of the present invention;

Fig. 3 is the twin-screw of the high specific torque enhanced heat transfer and mixing and plasticizing extruder without gear pump of the present invention;

Fig. 4 is a form of the active plasticizing part of the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention;

Fig. 5 is a form of the plasticizing part of the high specific torque enhanced heat transfer and mixing plasticizing extruder not using the gear pump of the present invention.

Fig. 6 is the connection between the cylindrical mandrel and the spline mandrel and the machine head of the high specific torque enhanced heat transfer and mixing and plasticizing extruder without using the gear pump;

Fig. 7 shows the connection between the high specific torque enhanced heat transfer and the screw element in the driven mixing part of the mixing and plasticizing extruder of the present invention.

In the figure, 1. Rack; 2. Gear box; 3. Feeding device; 4. Barrel; 5. Spline hole screw element; 6. Spline mandrel, 7. Gear pump; Screw element; 9. Enhanced heat transfer element; 10. Cylindrical mandrel; 11. Machine head 12. Motor; 13. Internal spiral groove barrel; Push bearing; 17. Seal ring; 18. End cover; 19. Splitter plate; 20. Cross-shaped boss; 21. Cross-shaped groove.

detailed description

The high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, as shown in Figure 1, mainly includes a frame 1, a reduction box 2, a feeding device 3, a barrel 4, active plasticizing parts, a gear pump 7, The driven mixing part, machine head 11, motor 12, heating and cooling parts, control system, etc., the active plasticizing part and the driven mixing part are connected by a gear pump 7, and the function of the gear pump 7 is to plasticize the active plasticizing part The melt is delivered to the driven mixing part with a large flow rate. Among them, the active plasticizing part is mainly composed of a spline hole screw element 5 and a spline mandrel 6, and a plurality of building block type spline hole screw elements 5 are connected in series on the spline mandrel 6 to form the active plasticizing part screw, and the spline mandrel 6. The end is connected to the reduction box 2. The motor 12 is rotated and the speed is reduced by the reduction box 2. The torque is transmitted to the screw mandrel, which then drives the active plasticizing component screw to rotate, and promotes the material to be plasticized and transported forward. The driven mixing part is mainly composed of a cylindrical hole screw element and a cylindrical mandrel 10, a plurality of building block type cylindrical hole screw elements, such as a screw element 8 for strengthening dispersion and mixing (such as a separation type, a shunt type, etc. screw configuration), a strengthening transmission The heat element 9 etc. are connected in series on the cylindrical mandrel 10 to form the driven mixing component screw, and the two ends of the cylindrical mandrel are respectively fixed at the gear pump 7 and the machine head 11. After the polymer is plasticized by the active plasticizing part, it is transported to the driven mixing part through the gear pump 7, and driven by the flow of the polymer melt itself, the cylindrical hole screw element in the driven mixing part is generated on the cylindrical mandrel 10. Driven by rotation, it further drives the polymer melt to mix, plasticize and convey forward while rotating.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the plasticizing part is realized by two parts: active plasticizing and driven mixing. The active plasticizing part is driven by the motor 12 through the reduction box 2 to rotate the screw of the active plasticizing part, and the driven mixing part indirectly drives the screw of the driven mixing part to rotate through the material flow. Therefore, the cylindrical mandrel 10 of the driven mixing part does not need to bear torque, and the length-to-diameter ratio of the screw is not limited; while the screw length of the active plasticizing part is short and can be used to bear high torque. The invention is not only applicable to multi-screw extruders such as twin-screws, but also applicable to single-screw extruders.

The high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the active plasticizing part and the driven mixing part are connected by a gear pump 7, and the function of the gear pump 7 is to plasticize the melt of the active plasticizing part Delivered to driven mixing elements at high flow rates. In the case of sufficient flow, the gear pump 7 may not be used. The active plasticizing part is directly connected to the driven mixing part. The cylindrical mandrel 10 of the driven mixing part is directly fixed on the splined mandrel 6 of the active plasticizing part, as shown in FIG. 2 . The spline hole screw element 5 in the active plasticizing part is connected in series to the spline mandrel 6 of the active plasticizing part, and the cylindrical hole screw element in the driven mixing part is connected in series to the cylindrical mandrel 10 of the driven mixing part, as shown in Figure 3 Show.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the connection scheme between the cylindrical mandrel 10, the spline mandrel 6 and the machine head 11 can be, as shown in Figure 6, the cylindrical mandrel 10 and the spline The connection of the key mandrel 6 is that the spline mandrel 6 has a hole, the cylindrical mandrel 10 and the spline mandrel 6 are relatively rotated through the thrust bearing 16, the circlip 15 is limited, the end cover 18 and the sealing ring 17 is sealed, the end cover 18 and the spline mandrel 6 are connected by bolts, the thrust bearing 16 is positioned by the shoulder of the end cover 18 and the spline mandrel 6, the thrust bearing 16 is used to bear the axial force, the end cover 18 and the cylinder A sealing ring 17 is provided between the mandrels 10 for sealing; similarly, the connection between the cylindrical mandrel 10 and the machine head 11 is that the center of the splitter plate 19 has a hole, and the cylindrical mandrel 10 extends into the hole of the diverter plate 19, and through the thrust The bearing 16 rotates relative to each other, the end cover 18 is sealed with the seal ring 17, the end cover 18 and the splitter plate 19 are connected by bolts, the thrust bearing 16 is positioned by the shoulder of the center hole of the end cover and the splitter plate 19, the end cover 18 and the cylindrical mandrel 10 is provided with sealing ring 17 sealing.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, one end of each screw element end face of the driven mixing part is grooved, and a boss is arranged at one end, and adjacent screw elements are bonded to each other through the groove and the boss, which changes the In the form of torque transmission, the traditional spline transmission between the mandrel and the screw element is changed to the keying transmission between the end faces of the screw element, which can effectively solve the problem that the spline mandrel 6 is easily twisted.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the end face bonding form of each screw element in the driven mixing part may be "cross" bonding or other forms, as shown in Figure 7. The cross-shaped bonding form is mainly to set up a cross-shaped boss 20 and a cross-shaped groove 21 on the two ends of the screw element, and insert the cross-shaped boss 20 of one screw element into the cross-shaped groove 21 of the adjacent screw element, thereby By analogy, a screw string is formed, and together with the cylindrical mandrel 10, a driven mixing component screw is formed.

The high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the active plasticizing part can adopt the form of a barrel 13 with an inner spiral groove and a screw 14 with a long groove to obtain good heat transfer plasticization and conveying capabilities, as shown in Figures 4 and 5.

In the high specific torque enhanced heat transfer and mixing plasticizing extruder of the present invention, the cylindrical mandrel 10 in the driven mixing part may also be a flexible mandrel such as a chain or a steel wire rope.

The above are concrete equipment and process conditions of the present invention, which are explained in cooperation with each figure. But the present invention is not limited to the above-mentioned specific equipment and process, any modification or replacement of related equipment based on the above-mentioned, any local adjustment of related processes based on the above-mentioned, as long as it is within the spirit of the present invention Within the scope, all belong to the present invention.

Claims (9)

1. It is 1. high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Mainly include frame, reduction box, charging dress Put, machine barrel, active Plasticized component, gear pump, driven hydrid component, head, motor, heating cooling-part and control system, it is main Dynamic to be connected between Plasticized component and driven hydrid component by gear pump, wherein active Plasticized component is mainly by splined hole screw element Being formed with spline mandrel, multiple building block system splined hole screw elements are connected on composition active Plasticized component screw rod on spline mandrel, Multiple key core shaft end is connected with reduction box, rotates the reduction of speed through reduction box by motor, moment of torsion is delivered to screw mandrel, and then band Dynamic active Plasticized component screw rod rotation, promotes material plasticizing and is fed forward；Driven hydrid component is mainly by cylindrical hole screw rod member Part and cylindrical mandrel's composition, multiple building block system cylindrical hole screw elements, which are connected in cylindrical mandrel, forms driven hydrid component spiral shell Bar, cylindrical mandrel both ends are separately fixed at gear pump and head.
2. It is 2. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Actively plastify Part is rotated by motor by reduction box active drive active Plasticized component screw rod, and driven hydrid component is indirect by Flow of Goods and Materials Driven hydrid component screw rod is driven to rotate.
3. It is 3. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Screw Extrusion Machine is double screw extruder or single screw extrusion machine.
4. It is 4. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Actively plastify Part is directly connected to driven hydrid component, and driven hydrid component cylindrical mandrel is directly anchored to active Plasticized component spline mandrel On, the splined hole screw element in active Plasticized component is connected on active Plasticized component spline mandrel, in driven hydrid component Cylindrical hole screw element is connected in driven hydrid component cylindrical mandrel.
5. It is 5. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Cylindrical mandrel Connection with spline mandrel is spline mandrel perforate, and relative rotation occurs by thrust bearing between cylindrical mandrel and spline mandrel Turn, circlip is spacing, end cap and sealing ring seal, end cap is bolted with spline mandrel, thrust bearing by end cap and The spline mandrel shaft shoulder is positioned, and thrust bearing is used for bearing axial force, and sealing ring is provided between end cap and cylindrical mandrel and is sealed；Cylinder Mandrel is flow distribution plate center drilling with the connection at head, and cylindrical mandrel is stretched into shunting plate hole, and phase occurs by thrust bearing Rotation, end cap and sealing ring are sealed, end cap is bolted with flow distribution plate, and thrust bearing is by end cap and flow distribution plate centre bore The shaft shoulder is positioned, and sealing ring is provided between end cap and cylindrical mandrel and is sealed.
6. It is 6. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Driven mixing Each screw element end face in part one end is slotted, and one end sets boss, and adjacent screw element is mutually bonded by groove and boss, changed The transmission form of moment of torsion is become, biography is bonded between traditional mandrel is changed into screw element end face with the spline drived of screw element It is dynamic.
7. It is 7. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Driven mixing Each screw element end face bonding scheme in part is cross bonding scheme, and cross bonding scheme is mainly at screw element both ends Face opens up cross boss and cross groove respectively, and adjacent screws element is inserted by the cross boss of a screw element Cross groove, by that analogy, form screw rod string, driven hydrid component screw rod is formed together with cylindrical mandrel.
8. It is 8. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Actively plastify Part is using opening inner spiral groove machine barrel and opening the form of strip grooves screw rod, to obtain good heat transfer plasticizing and conveying capacity.
9. It is 9. according to claim 1 high than moment of torsion augmentation of heat transfer and mixing plasticizing extruder, it is characterised in that：Driven mixing Cylindrical mandrel in part is chain or steel wire rope.