Vertically-distributed multi-stage double-screw extruder

Abstract

The utility model discloses a vertically-distributed multi-stage double-screw extruder which comprises a plurality of double-screw extruders and a barrel bracket, each double-screw extruder comprises a driving device, two screws and a machine barrel, the two screws are in meshed transmission with each other, the two screws are in transmission connection with the driving device and can be rotatably inserted into the machine barrel, and the machine barrel is provided with a feeding port, a discharging port and / or a liquid feeding port; the multiple double-screw extruders are distributed in the vertical direction, driving devices of the multiple double-screw extruders are vertically stacked and connected with one another, machine barrels of the multiple double-screw extruders are sequentially arranged on the barrel support in the vertical direction, and a discharging port of the machine barrel of each double-screw extruder is connected with a feeding port of the machine barrel of the adjacent double-screw extruder. Therefore, the double-screw extruder in multi-stage arrangement is formed. The screw rod is large in total length-diameter ratio, small in occupied area and capable of increasing the material flowing space and improving the material output quality.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery slurry, and more specifically to a vertically distributed multi-stage twin-screw extruder. Background Art

[0002] In the field of lithium battery slurry preparation, the positive and negative raw materials (powders and liquids) of lithium batteries are mostly mixed, dispersed, ground, and vacuumed through parallel twin-screw extruders to form slurries. At present, in order to fully mix the materials, one way is to increase the aspect ratio of the screw to extend the residence time of the materials, but the large aspect ratio screw will cause greater bending deformation and reduce the gap between the screw and the barrel wall, resulting in friction and heat generation between the screw and the barrel wall during rotation, and wear and tear to produce metal particles, reducing the quality of material output; another way is to distribute multiple twin-screw extruders horizontally and connect adjacent twin-screw extruders. Although the materials are fully mixed, it occupies a large area.

[0003] In summary, how to provide a vertically distributed multi-stage twin-screw extruder with a long screw total length-to-diameter ratio and a small footprint to increase material flow space and improve material output quality is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a vertically distributed multi-stage twin-screw extruder, which has a long total screw length-to-diameter ratio and a small footprint, can increase material flow space and improve material output quality.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A vertically distributed multi-stage twin-screw extruder comprises a plurality of twin-screw extruders and a barrel support;

[0007] Each of the twin-screw extruders comprises a driving device, two mutually meshing screws and a barrel, the two screws are both connected to the driving device and can be rotatably inserted into the barrel, and the barrel is respectively provided with a feed port, a discharge port and / or a liquid feeding port;

[0008] Multiple twin-screw extruders are distributed in a vertical direction, and the driving devices of the multiple twin-screw extruders are vertically stacked and connected to each other, the barrels of the multiple twin-screw extruders are sequentially arranged on the barrel support in a vertical direction, and the discharge port of the barrel of each twin-screw extruder is connected to the feed port of the barrel of the adjacent twin-screw extruder to form a multi-stage arrangement of the twin-screw extruders.

[0009] Preferably, the barrel comprises a plurality of barrel sections, and the plurality of barrel sections are distributed in a horizontal direction.

[0010] Preferably, the driving device comprises a motor, a transmission box and a transmission cylinder, and both ends of the transmission cylinder are respectively sealed and connected between the transmission box and the first section of the cylinder;

[0011] One end of the two screws extends out of the first section of the barrel, and extends into the transmission barrel to be respectively connected to the two output shafts of the transmission box. The input shaft of the transmission box is connected to the motor, and a first seal is provided between one end of the two screws and the first section of the barrel.

[0012] Preferably, a transmission box spacer is provided between the transmission boxes of adjacent twin-screw extruders.

[0013] Preferably, the transmission cylinder comprises two support plates distributed up and down and two transparent plates arranged between the two support plates, and a first waste outlet is provided on the lower support plate at a position corresponding to the first sealing member.

[0014] Preferably, the last section of the barrel of each twin-screw extruder is connected to a supporting transmission barrel, the other ends of the two screws are rotatably disposed in the supporting transmission barrel through bearings, a second seal is provided between the other ends of the two screws and the supporting transmission barrel, and a second waste outlet is provided at the position of the supporting transmission barrel corresponding to the second seal.

[0015] Preferably, the barrel supports are provided in at least two numbers, one of which is supported between the transmission barrel and the first barrel section of the plurality of twin-screw extruders, and the other of which is supported between the last two barrel sections of the plurality of twin-screw extruders.

[0016] Preferably, the cylinder support comprises two vertical beams arranged in the vertical direction, a plurality of horizontal beams arranged in the horizontal direction and a base, the two vertical beams are symmetrically arranged on the base, and the plurality of horizontal beams are evenly spaced and arranged between the two vertical beams in the vertical direction;

[0017] The transmission cylinder and the first section of the cylinder, as well as the last two sections of the cylinder, are both arranged on the crossbeam via flanges, and an adjustment pad is arranged between the flange and the crossbeam.

[0018] Preferably, the twin-screw extruder is provided with five units to form a twin-screw extruder arranged in five stages, and the multi-section barrel is provided with four sections;

[0019] In the single-stage twin-screw extruder, the first-stage barrel, the third-stage barrel and the fourth-stage barrel are respectively provided with a first-stage feed port, a first-stage liquid feed port and a first-stage discharge port;

[0020] In the two-stage twin-screw extruder, the barrel described in the first section, the barrel described in the third section and the barrel described in the fourth section are respectively provided with a second-stage discharge port, a second-stage liquid feeding port and a second-stage feed port;

[0021] In the three-stage twin-screw extruder, the barrel described in the first section, the barrel described in the third section and the barrel described in the fourth section are respectively provided with a three-stage feed port, a three-stage liquid feed port and a three-stage discharge port;

[0022] In the four-stage twin-screw extruder, the barrel described in the first section and the barrel described in the fourth section are respectively provided with a four-stage discharge port and a four-stage discharge port;

[0023] In the five-stage twin-screw extruder, the first-stage barrel and the supporting transmission barrel are respectively provided with a five-stage feed port and a five-stage discharge port.

[0024] Preferably, the screw of the first-stage twin-screw extruder is provided with a first-stage forward conveying screw element;

[0025] The screws of the second-stage twin-screw extruder are staggered with second-stage forward conveying screw elements and second-stage forward deflection kneading block elements, and the second-stage forward deflection kneading block elements are correspondingly arranged between the second-stage liquid feeding port and the second-stage discharge port;

[0026] The screws of the three-stage twin-screw extruder are staggered with three-stage forward conveying screw elements and three-stage forward deflection kneading block elements, and the three-stage forward deflection kneading block elements are correspondingly arranged between the three-stage liquid feeding port and the three-stage discharge port;

[0027] The screw of the four-stage twin-screw extruder is staggered with a four-stage forward conveying screw element, a four-stage forward deflection kneading block element, and a four-stage reverse conveying screw element and a four-stage reverse deflection kneading block element which are shorter than the two, for enhancing the mixing of materials;

[0028] The screw of the five-stage twin-screw extruder is provided with a five-stage forward conveying screw element.

[0029] Compared with the background technology, the vertically distributed multi-stage twin-screw extruder provided by the utility model is composed of multiple twin-screw extruders and barrel supports, multiple twin-screw extruders are distributed in the vertical direction, and the driving devices of the multiple twin-screw extruders are vertically stacked and connected to each other, and the barrels of the multiple twin-screw extruders are arranged on the barrel support in sequence in the vertical direction, and the barrel discharge port of each twin-screw extruder is connected to the barrel feed port of its adjacent twin-screw extruder to form a multi-stage arranged twin-screw extruder. In this way, the driving device of each stage twin-screw extruder drives two screws to rotate, and the powder and the glue are first added to the barrel of the first-stage twin-screw extruder through the first-stage feed port and the first-stage liquid feed port respectively, and the two screws are used for rotation and transportation, and the materials are preliminarily mixed and transported to the first-stage discharge port, and fall into the barrel of the second-stage twin-screw extruder under the action of gravity, and the materials are mixed for the second time until they fall into the barrel of the last-stage twin-screw extruder, and the materials are fully mixed.

[0030] Therefore, this application has the following beneficial effects:

[0031] (1) Multiple twin-screw extruders are distributed vertically to save floor space.

[0032] (2) Multiple twin-screw extruders are connected to form a multi-stage twin-screw extruder. The total length-to-diameter ratio of the screw is large, so that the screw length-to-diameter of each stage of the twin-screw extruder is small, reducing the bending deformation of the screw, avoiding the problem of heat generation due to screw friction and impurities caused by metal wear, that is, increasing the material flow space and improving the material output quality.

[0033] (3) Twin-screw extruders of any order can operate independently, which can meet the production requirements of modularization and complex materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of the vertically distributed multi-stage twin-screw extruder provided by the utility model

[0036] Figure 2 A front view of the vertically distributed multi-stage twin-screw extruder provided by the utility model;

[0037] Figure 3 for Figure 2 Section view at AA.

[0038] Figure 1-3 middle:

[0039] 1 is a first-stage twin-screw extruder, 2 is a second-stage twin-screw extruder, 3 is a third-stage twin-screw extruder, 4 is a fourth-stage twin-screw extruder, 5 is a fifth-stage twin-screw extruder, 6 is a barrel bracket, 7 is a motor, 8 is a transmission box, 9 is a transmission box bottom plate, 10 is a positioning bolt, 11 is a positioning nut, 12 is a transmission box spacer, 13 is an adjustment pad, 14 is a transmission barrel, 15 is a spline sleeve, 16 is a screw, 17 is a barrel, 18 is a support Transmission cylinder, 19 is the first-order feed port, 20 is the first-order liquid feeding port, 21 is the first-order discharge port, 22 is the second-order feed port, 23 is the second-order liquid feeding port, 24 is the second-order discharge port, 25 is the third-order feed port, 26 is the third-order liquid feeding port, 27 is the third-order discharge port, 28 is the fourth-order feed port, 29 is the fourth-order discharge port, 30 is the fifth-order feed port, 31 is the fifth-order discharge port, 32 is the first row of waste ports, and 33 is the second row of waste ports. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The core of the utility model is to provide a vertically distributed multi-stage twin-screw extruder. The vertically distributed multi-stage twin-screw extruder has a long total length-to-diameter ratio of the screws and a small footprint, which can increase the material flow space and improve the material output quality.

[0042] It should be noted that, in the present embodiment, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0043] Please refer to Figure 1 The present application provides a vertically distributed multi-stage twin-screw extruder, comprising a plurality of twin-screw extruders and a barrel support 6.

[0044] Each twin-screw extruder includes a driving device, two mutually meshing screws 16 and a barrel. The two screws 16 are connected to the driving device and can be rotatably inserted into the barrel. The barrel is respectively provided with a feed port, a discharge port and / or a liquid feeding port.

[0045] Multiple twin-screw extruders are distributed in a vertical direction, and the driving devices of the multiple twin-screw extruders are vertically stacked and connected to each other. The barrels of the multiple twin-screw extruders are arranged on the barrel support 6 in sequence in the vertical direction, and the discharge port of the barrel of each twin-screw extruder is connected to the feed port of the barrel of the adjacent twin-screw extruder to form a multi-stage arrangement of the twin-screw extruders.

[0046] It should be noted that multiple twin-screw extruders are distributed in the vertical direction, and each twin-screw extruder includes a driving device, two screws 16 and a barrel. The two screws 16 are meshed and driven with each other, and are arranged close to the axis of the barrel to avoid wear between the screws 16 and the inner wall of the barrel. Both screws 16 can be rotatably inserted into the barrel, and one end of the two screws 16 is connected to the output end of the driving device, and the driving device is used to drive the two screws 16 to rotate synchronously in the same direction. In addition, the driving devices of multiple twin-screw extruders are stacked vertically and connected to each other, and the barrels of multiple twin-screw extruders are arranged on the barrel support 6 in sequence in the vertical direction, and the barrel discharge port of each twin-screw extruder is connected to the barrel feed port of its adjacent twin-screw extruder. In this way, the driving device of each twin-screw extruder drives the two screws 16 to rotate, and the powder and the glue are first added into the barrel of the first-stage twin-screw extruder 1 through the first-stage feed port 19 and the first-stage liquid feed port 20 respectively. The two screws 16 are used for rotation and transportation. The materials are preliminarily mixed and transported to the first-stage discharge port 21, and fall into the barrel of the second-stage twin-screw extruder 2 under the action of gravity. The materials are mixed for the second time until they fall into the barrel of the last-stage twin-screw extruder and are fully mixed.

[0047] Considering the specific structure and installation mode of the barrel, on the basis of the above embodiment, the barrel includes a multi-section barrel 17, and the multi-section barrel 17 is distributed in the horizontal direction. In this way, the barrel composed of the multi-section barrel is suitable for conveying long materials, and is convenient for disassembly and assembly and processing of the barrel.

[0048] Considering the specific structure and installation method of the driving device, based on the above embodiment, please refer to Figure 2 The driving device includes a motor 7, a transmission box 8 and a transmission cylinder 14, and the two ends of the transmission cylinder 14 are respectively sealed and connected between the transmission box 8 and the first section of the cylinder; one end of the two screws 16 extends out of the first section of the cylinder and extends into the transmission cylinder 14 and is respectively connected to the two output shafts of the transmission box 8, the input shaft of the transmission box 8 is connected to the motor 7, and a first seal is provided between one end of the two screws 16 and the first section of the cylinder.

[0049] Specifically, the driving device is composed of a motor 7, a transmission box 8 and a transmission barrel 14. The output shaft of the motor 7 is coaxially connected to the input shaft of the transmission box 8 to provide a power source, and the motor 7 of each stage of the twin-screw extruder can be independently adjusted and controlled; a gear set is arranged in the transmission box 8, and the two output shafts of the transmission box 8 are coaxially connected to the left ends of the two screws 16 respectively. The transmission box 8 is used to convert the single-axis rotation input by the motor 7 into the synchronous rotation of the two shafts in the same direction through the gear set transmission. It should be noted that the screws 16 of the adjacent twin-screw extruders have opposite directions; sealing ring grooves are provided on the two end surfaces of the transmission barrel 14, and sealing rings are embedded in the sealing ring grooves. The two ends of the transmission barrel 14 are respectively connected to the transmission box 8 and the first section barrel through flanges, and the left end of the screw 16 extends out of the first section barrel and extends into the transmission barrel 14. The left end of the screw 16 is provided with a sealing packing sleeve and is fastened to the first section barrel through a pressure cap to seal the end of the screw 16 to prevent the material in the barrel from flowing out.

[0050] Optionally, the output shaft of the transmission box 8 is connected to the left end of the screw 16 through a spline sleeve 15. Specifically, the output shaft of the transmission box 8 is an involute external spline, the inner hole of the spline sleeve 15 is an involute internal spline, the left end of the screw 16 is an involute external spline, and the involute external spline connected to the inner hole of the spline sleeve 15 and its two ends is transmitted through an involute spline pair to efficiently transmit torque.

[0051] In addition, optionally, the gears of the gear set are oil-immersed and lubricated, and the transmission box 8 is externally connected to a circulating oil pump to cool the lubricating oil through a heat exchanger to reduce friction between gears, reduce power loss, and increase service life.

[0052] During use, a small amount of material may leak from the sealing packing and flow into the transmission cylinder 14. In order to realize the timely cleaning of the transmission cylinder 14, based on the above embodiment, please refer to Figure 3 The transmission cylinder 14 includes two support plates distributed up and down and two transparent plates arranged between the two support plates, and a first row of waste ports 32 is arranged on the lower support plate and at a position corresponding to the first sealing member.

[0053] Specifically, the two support plates are distributed up and down and connected between them. Transparent plates are arranged between the two sides of the two support plates to facilitate observation of the material situation in the transmission cylinder 14 and the transmission situation of the spline sleeve 15. The first row of waste ports 32 are arranged near the sealing packing on the lower support plate. The first row of waste ports 32 can be discharged through an external pipeline to timely remove the material leaked from the sealing packing to avoid affecting the torque transmitted by the spline sleeve 15.

[0054] It should be noted that the transmission box bottom plates 9 of the adjacent-stage twin-screw extruders are fixed by a plurality of positioning studs and connected by positioning nuts 11 to limit the displacement of the transmission box 8 in the vertical and horizontal directions.

[0055] For further information, please refer to Figure 2 A transmission box spacer 12 is provided between the transmission boxes 8 of adjacent twin-screw extruders to play a role in shock absorption and auxiliary support.

[0056] Considering the stability of the screw rod 16, based on the above embodiment, please refer to Figure 1 and Figure 3 The last barrel section 17 of each twin-screw extruder is connected to a supporting transmission barrel 18, the other ends of the two screws 16 are rotatably arranged in the supporting transmission barrel 18 through bearings, a second seal is arranged between the other ends of the two screws 16 and the supporting transmission barrel 18, and a second waste outlet 33 is arranged at the position of the supporting transmission barrel 18 corresponding to the second seal.

[0057] Specifically, taking the first-stage twin-screw extruder 1 as an example, the last section of the cylinder 17 is connected to the supporting transmission cylinder 18, and a bearing is arranged in the supporting transmission cylinder 18. The left end of the screw 16 is connected to the output shaft of the transmission box 8, and the right end extends out of the last section of the cylinder 17 and is rotatably arranged on the bearing to support and drive the screw 16, so that both ends of the screw 16 are supported, reducing the bending deformation of the screw 16, thereby avoiding the frictional heat of the screw 16 or the generation of metal foreign matter due to wear. In addition, a sealing packing is arranged on the right end of the screw 16 to seal the end of the screw 16, and since a small amount of material leaks from the sealing packing and flows into the supporting transmission cylinder 18, a second row of waste ports 33 is arranged below the supporting transmission cylinder 18 and close to the sealing packing. The second row of waste ports 33 can be discharged through an external pipeline to timely remove the material leaking from the sealing packing.

[0058] Considering the stability of the barrel structure, based on the above examples, please refer to Figure 1 There are at least two barrel supports 6, one barrel support 6 is supported between the transmission barrel 14 and the first barrel section of multiple twin-screw extruders, and the other barrel support 6 is supported between the last two barrel sections 17 of multiple twin-screw extruders to ensure that the barrels of the multiple twin-screw extruders are distributed in the vertical direction and firmly installed on the ground.

[0059] It should be noted that adjacent stages of the cylinder bodies 17 are connected via flanges to ensure that the multiple stages of the cylinder bodies 17 are coaxially connected to form a barrel.

[0060] Considering the specific structure and installation method of the cylinder support 6, based on the above embodiment, please refer to Figure 1The cylinder support 6 includes two vertical beams arranged in the vertical direction, multiple horizontal beams arranged in the horizontal direction and a base. The two vertical beams are symmetrically arranged on the base, and multiple horizontal beams are evenly distributed between the two vertical beams in the vertical direction; the transmission cylinder 14 and the first section of the cylinder, as well as the last two sections of the cylinder 17 are all arranged on the horizontal beam through flanges, and an adjustment pad 13 is provided between the flange and the horizontal beam.

[0061] Specifically, the barrel support 6 is composed of two vertical beams, multiple horizontal beams and a base. The two vertical beams are symmetrically and vertically arranged on the base. The multiple horizontal beams are evenly spaced in the vertical direction, and the distance between adjacent horizontal beams must be greater than the height of the flange; in addition, the multiple flanges between the transmission barrel 14 and the first section of the barrel in the multi-stage twin-screw extruder are distributed in the vertical direction on the multiple horizontal beams of one barrel support 6, and the multiple flanges between the last two sections of the barrel 17 in the multi-stage twin-screw extruder are distributed in the vertical direction on the multiple horizontal beams of another barrel support 6, and an adjustment pad 13 is provided between the flange and the horizontal beam, so as to fine-tune the height of the barrel 17 by fine-tuning the height of the adjustment pad 13, thereby reducing the wear between the inner wall of the barrel 17 and the screw 16 caused by the coaxiality error.

[0062] In order to clarify the function of each stage of twin-screw extruders and to adapt to the production requirements of various formula materials, based on the above embodiment, the multiple twin-screw extruders are set to five to form a five-stage arrangement of the twin-screw extruder, and the multi-section barrel 17 is set to four sections.

[0063] In the single-stage twin-screw extruder 1, the first barrel section, the third barrel section and the fourth barrel section are respectively provided with a first-stage feed port 19, a first-stage liquid feed port 20 and a first-stage discharge port 21.

[0064] In the two-stage twin-screw extruder 2, the first barrel section, the third barrel section and the fourth barrel section are respectively provided with a second-stage discharge port 24, a second-stage liquid feed port 23 and a second-stage feed port 22.

[0065] In the three-stage twin-screw extruder 3, a third-stage feed port 25, a third-stage liquid feed port 26 and a third-stage discharge port 27 are respectively provided on the first barrel section, the third barrel section and the fourth barrel section.

[0066] The first barrel section and the fourth barrel section of the four-stage twin-screw extruder 4 are respectively provided with a fourth-stage discharge port 29 and a fourth-stage discharge port 29 .

[0067] The first barrel section and the supporting transmission barrel section 18 of the five-stage twin-screw extruder 5 are respectively provided with a five-stage feed port 30 and a five-stage discharge port 31 .

[0068] It should be noted that the first-stage twin-screw extruder 1 realizes preliminary mixing, the first-stage feed port 19 is used to add powder into the barrel, and the first-stage liquid feed port 20 is used to add glue into the barrel. After preliminary mixing, the material enters the second-stage twin-screw extruder 2 through the first-stage discharge port 21; the second-stage twin-screw extruder 2 and the third-stage twin-screw extruder 3 are both conducive to sufficient mixing of the materials, and the second-stage liquid feed port 23 and the third-stage liquid feed port 26 are both used to add viscosity adjusting solvents into the barrel to mix with the initial mixed materials to reduce the viscosity, which is more convenient for subsequent shear enhanced dispersion, thereby ensuring sufficient mixing of the materials, and other solvents can also be added to achieve the preparation of materials with different formulas; the fourth-stage twin-screw extruder 4 further enhances material mixing; the fifth-stage twin-screw extruder 5 realizes material conveying and discharge.

[0069] Furthermore, a first-order forward conveying screw element is provided on the screw 16 of the first-stage twin-screw extruder 1, so that the powder is added into the first-stage barrel through the first-stage feed port 19, and moves to the first-stage discharge port 21 under the action of the first-stage forward conveying screw element, and the glue is added through the first-stage liquid feeding port 20, and intersects with the powder in the third-stage barrel to achieve preliminary mixing, and is transported to the first-stage discharge port 21 by the first-stage forward conveying screw element, and falls into the second-stage twin-screw extruder 2 through the second-stage feed port 22 under the action of gravity.

[0070] It should be noted that the first-order forward conveying screw element forward conveying refers to rightward conveying, and it is mainly composed of a forward large lead screw element, a forward small lead screw element and a forward moderate lead screw element. The screw 16 is provided with a forward large lead screw element at the first-order feed port 19 and the first-order liquid feed port to avoid pressure accumulation and return of the material. The screw 16 is provided with a forward small lead screw element on the left side of the first-order feed port 19 to enable the material to maintain forward conveying better. The position on the screw 16 corresponding to the first-order discharge port 21 is an optical axis element, so that the primary mixed material will not continue to be conveyed to the right and directly fall into the second-order feed port 22. At the same time, the screw 16 is provided with a reverse small lead screw element at the right side of the first-order discharge port 21, so that the primary mixed material reaching the right side of the first-order discharge port 21 returns and falls into the second-order feed port 22, and the remaining positions on the screw 16 are provided with positive moderate lead screw elements.

[0071] Furthermore, the screw 16 of the second-stage twin-screw extruder 2 is staggered with second-stage forward conveying screw elements and second-stage forward deflection kneading block elements, and the second-stage forward deflection kneading block elements are correspondingly arranged between the second-stage liquid feeding port 23 and the second-stage discharge port 24.

[0072] It should be noted that the forward conveying direction of the second-order forward conveying screw element and the second-order forward deflection kneading block element is to convey to the left. The second-order forward conveying screw element is mainly composed of a forward large lead screw element, a forward small lead screw element and a forward moderate lead screw element. The second-order forward deflection kneading block element is a combined shear screw 16 element, which is a regular combination of shear kneading blocks of different rotation phases and different lengths. Generally, 5 or 9 kneading blocks with a positive phase deflection of 45° and a multi-piece phase deflection of 60° are combined with 4 kneading blocks with a phase deflection of 90° and a multi-piece phase deflection of 90°. The deflection direction is the same as the rotation direction of the forward conveying screw element. According to the function and the axial space of 13-screw 16, the number in the combination is not fixed. The specific structure can refer to the prior art and will not be repeated here. The screw 16 is at the second-order feed port 22 and the second-order liquid feeding port 2 3, and a positive medium-pitch screw element can be set at the position of the screw 16 corresponding to the second-order feed port 22 and the second-order liquid feeding port 23. The screw 16 is correspondingly provided with a second-order positive deflection kneading block element between the second-order liquid feeding port 23 and the second-order discharge port 24, so that the solvent added through the second-order liquid feeding port 23 can be fully mixed with the primary mixed material. The screw 16 is correspondingly provided with a positive medium-pitch screw element on the right side of the second-order discharge port 24, so that the secondary mixed material can be conveyed by the positive screw 16 element with a moderate lead before reaching the second-order discharge port 24. In addition, the screw 16 is correspondingly set as an optical axis element at the second-order discharge port 24, so that the secondary mixed material will not continue to be conveyed to the left, so as to directly fall into the third-order feed port 25, and the screw 16 is correspondingly provided with a second-order reverse small-pitch screw element on the left side of the second-order discharge port 24, so that the material returns to the second-order discharge port 24 for discharge.

[0073] Furthermore, the screw 16 of the three-stage twin-screw extruder 3 is staggered with three-stage positive conveying screw elements and three-stage positive deflection kneading block elements, and the three-stage positive deflection kneading block elements are correspondingly arranged between the third-stage liquid feeding port 26 and the third-stage discharge port 27.

[0074] It should be noted that the forward conveying direction of the third-order forward conveying screw element and the third-order forward deflection kneading block element is conveyed to the right, and their specific structures and arrangement order on the screw 16 are similar to those of the second-order twin-screw extruder 2, which will not be repeated here. In this way, the secondary mixed material enters the first section of the barrel through the third-order feed port 25, and is conveyed to the second section of the barrel through the third-order forward moderate lead screw element. The solvent is added through the third-order liquid feeding port 26 and intersects with the secondary mixed material. Under the action of the third-order forward deflection kneading block element, the solvent and the secondary mixed material are fully mixed, and then conveyed to the third-order discharge port 27 by the third-order forward moderate lead screw element. Under the action of gravity, the tertiary mixed material falls into the fourth-stage twin-screw extruder 4.

[0075] Furthermore, the screw 16 of the four-stage twin-screw extruder 4 is staggered with a four-stage forward conveying screw element, a four-stage forward deflection kneading block element, and a four-stage reverse conveying screw element and a four-stage reverse deflection kneading block element which are shorter than the two, for enhancing the mixing of the materials;

[0076] It should be noted that the forward conveying direction of the fourth-order forward conveying screw element and the fourth-order forward deflection kneading block element is to the left, and the fourth-order forward conveying screw element, the fourth-order forward deflection kneading block element, the fourth-order reverse conveying screw element and the fourth-order reverse deflection kneading block element on the screw 16 are arranged alternately. The specific structure and arrangement method can be referred to the prior art and will not be repeated here, as long as it can enhance the mixing of materials.

[0077] Furthermore, the screw 16 of the fifth-stage twin-screw extruder is provided with a fifth-stage forward conveying screw element.

[0078] It should be noted that the five-step forward conveying screw element forward conveys to the right, and is mainly composed of five-step forward moderate lead screw elements to reduce bubbles in the material to a certain extent, and finally the material is discharged from the five-step discharge port 31 on the supporting transmission cylinder 18.

[0079] In summary, the vertically distributed multi-stage twin-screw extruder of the present application has the following beneficial effects:

[0080] (1) Multiple twin-screw extruders are distributed vertically to save floor space.

[0081] (2) Multiple twin-screw extruders are connected to form a multi-stage twin-screw extruder. The total length-to-diameter ratio of the screw is large, so that the screw length-to-diameter of each stage of the twin-screw extruder is small, reducing the bending deformation of the screw, avoiding the problem of heat generation due to screw friction and impurities caused by metal wear, that is, increasing the material flow space and improving the material output quality.

[0082] (3) Twin-screw extruders of any order can operate independently, which can meet modular and complex material production requirements. In other words, twin-screw extruders of each order can be customized according to different process requirements by simply adjusting the arrangement of the screw conveying elements, so that the function of each twin-screw extruder can be clearly defined, which is convenient for maintenance and adjustment.

[0083] (4) Each stage of twin-screw extruder is equipped with a separate drive motor and is independently controlled. The speed can be adjusted according to different working conditions to find the most suitable speed for each process stage and reduce the total energy consumption.

[0084] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0085] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0086] The vertically distributed multi-stage twin-screw extruder provided by the utility model is introduced in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A vertically distributed multi-stage twin-screw extruder, characterized in that: It includes a plurality of twin-screw extruders and a barrel support (6); Each of the twin-screw extruders comprises a driving device, two mutually meshing screws (16) and a barrel, wherein the two screws (16) are both in driving connection with the driving device and can be rotatably inserted into the barrel, and the barrel is respectively provided with a feed port, a discharge port and / or a liquid feeding port; The plurality of twin-screw extruders are distributed in a vertical direction, and the driving devices of the plurality of twin-screw extruders are vertically stacked and connected to each other, the barrels of the plurality of twin-screw extruders are arranged on the barrel support (6) in sequence in a vertical direction, and the discharge port of the barrel of each twin-screw extruder is connected to the feed port of the barrel of the adjacent twin-screw extruder, so as to form a multi-stage arrangement of the twin-screw extruders.

2. The vertically distributed multi-stage twin-screw extruder according to claim 1, characterized in that: The barrel comprises a plurality of barrel sections (17), and the plurality of barrel sections (17) are distributed in a horizontal direction.

3. The vertically distributed multi-stage twin-screw extruder according to claim 2, characterized in that: The driving device comprises a motor (7), a transmission box (8) and a transmission cylinder (14), and the two ends of the transmission cylinder (14) are respectively sealed and connected between the transmission box (8) and the first section of the cylinder (17); One end of each of the two screw rods (16) extends out of the first section of the barrel (17), and extends into the transmission barrel (14) to be respectively connected to the two output shafts of the transmission box (8); the input shaft of the transmission box (8) is connected to the motor (7), and a first sealing member is provided between one end of each of the two screw rods (16) and the first section of the barrel (17).

4. The vertically distributed multi-stage twin-screw extruder according to claim 3, characterized in that: A transmission box spacer (12) is provided between the transmission boxes (8) of adjacent twin-screw extruders.

5. The vertically distributed multi-stage twin-screw extruder according to claim 3, characterized in that: The transmission cylinder (14) comprises two support plates distributed up and down and two transparent plates arranged between the two support plates, and a first waste outlet (32) is arranged on the lower support plate at a position corresponding to the first sealing member.

6. The vertically distributed multi-stage twin-screw extruder according to claim 3, characterized in that: The last section of the barrel (17) of each twin-screw extruder is connected to a supporting transmission barrel (18), the other ends of the two screws (16) are rotatably arranged in the supporting transmission barrel (18) through bearings, a second sealing member is arranged between the other ends of the two screws (16) and the supporting transmission barrel (18), and a second waste discharge port (33) is arranged at a position of the supporting transmission barrel (18) corresponding to the second sealing member.

7. The vertically distributed multi-stage twin-screw extruder according to claim 3, characterized in that: The barrel supports (6) are provided in at least two numbers, one of the barrel supports (6) is supported between the transmission barrel (14) and the first barrel (17) of the plurality of twin-screw extruders, and the other barrel support (6) is supported between the last two barrels (17) of the plurality of twin-screw extruders.

8. The vertically distributed multi-stage twin-screw extruder according to claim 7, characterized in that: The cylinder support (6) comprises two vertical beams arranged in the vertical direction, a plurality of horizontal beams arranged in the horizontal direction, and a base, wherein the two vertical beams are symmetrically arranged on the base, and the plurality of horizontal beams are evenly spaced and distributed between the two vertical beams in the vertical direction; The transmission cylinder (14) and the first section of the cylinder (17), as well as the last two sections of the cylinder (17), are both arranged on the crossbeam via flanges, and an adjustment pad (13) is arranged between the flanges and the crossbeam.

9. The vertically distributed multi-stage twin-screw extruder according to claim 6, characterized in that: The twin-screw extruders are provided in five units to form a twin-screw extruder arranged in five stages, and the multi-section barrel (17) is provided in four sections; In the first-stage twin-screw extruder (1), the first-stage barrel (17), the third-stage barrel (17) and the fourth-stage barrel (17) are respectively provided with a first-stage feed port (19), a first-stage liquid feed port (20) and a first-stage discharge port (21); In the two-stage twin-screw extruder (2), the first-stage barrel (17), the third-stage barrel (17) and the fourth-stage barrel (17) are respectively provided with a second-stage discharge port (24), a second-stage liquid feed port (23) and a second-stage feed port (22); In the three-stage twin-screw extruder (3), the first-stage barrel (17), the third-stage barrel (17) and the fourth-stage barrel (17) are respectively provided with a three-stage feed port (25), a three-stage liquid feed port (26) and a three-stage discharge port (27); In the four-stage twin-screw extruder (4), the first section of the barrel (17) and the fourth section of the barrel (17) are respectively provided with a fourth-stage discharge port (29) and a fourth-stage discharge port (29); In the five-stage twin-screw extruder (5), the first-stage barrel (17) and the supporting transmission barrel (18) are respectively provided with a five-stage feed port (30) and a five-stage discharge port (31).

10. The vertically distributed multi-stage twin-screw extruder according to claim 9, characterized in that: The screw (16) of the first-stage twin-screw extruder (1) is provided with a first-stage forward conveying screw element; The screws (16) of the second-stage twin-screw extruder (2) are staggeredly provided with second-stage forward conveying screw elements and second-stage forward deflection kneading block elements, and the second-stage forward deflection kneading block elements are correspondingly arranged between the second-stage liquid feeding port (23) and the second-stage discharge port (24); The screw (16) of the three-stage twin-screw extruder (3) is staggeredly provided with three-stage positive conveying screw elements and three-stage positive deflection kneading block elements, and the three-stage positive deflection kneading block elements are correspondingly arranged between the three-stage liquid feeding port (26) and the three-stage discharge port (27); The screw (16) of the four-stage twin-screw extruder (4) is staggeredly provided with a four-stage forward conveying screw element, a four-stage forward deflection kneading block element, and a four-stage reverse conveying screw element and a four-stage reverse deflection kneading block element which are shorter than the four-stage reverse conveying screw element and the four-stage reverse deflection kneading block element, so as to enhance the mixing of materials; The screw (16) of the five-stage twin-screw extruder (5) is provided with a five-stage forward conveying screw element.

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