Multi-stage double-screw pulping system

Abstract

The utility model relates to a multistage twin-screw pulping system which comprises a plurality of twin-screw kneading machines which are cascaded from a feeding direction to a discharging direction, the length-diameter ratio of a single screw in each twin-screw kneading machine is less than 40, each screw is supported by a support component, and the support component supports the corresponding screw to rotate stably. By arranging the supporting assembly, the rotating stability of the screw can be improved, so that friction between the screw and the inner wall of the pulping cylinder is reduced, metal particles are prevented from being generated, and the pulping quality and the pulping efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery slurry preparation, in particular to a multi-stage twin-screw slurry making system. Background Art

[0002] A twin-screw kneader is usually used to prepare lithium battery slurry. The twin screws inside the kneader rotate to stir the powder raw materials and liquid raw materials, thereby preparing the lithium battery slurry.

[0003] The twin-screw kneading machine in the prior art usually adopts a barrel with multiple sections installed in a straight line and a screw with a length-to-diameter ratio of 44. Due to the long screw, the rotation stability of this twin-screw kneading machine is poor when making slurry, and collision and friction will occur between the twin screws inside and between the twin screws and the inner wall of the barrel, thereby generating metal particles, contaminating the slurry and affecting the slurry quality; at the same time, its stirring efficiency is low. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a multi-stage twin-screw pulping system. By setting a support assembly, the rotational stability of the screw can be improved, thereby reducing the friction between the screw and the inner wall of the pulping barrel, avoiding the generation of metal particles, and improving the pulping quality and efficiency.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A multi-stage twin-screw pulping system includes several twin-screw kneaders cascaded from the feeding direction to the discharging direction. The aspect ratio of a single screw in a single twin-screw kneader is less than 40. Each screw is supported by a support assembly, and the support assembly supports the corresponding screw to rotate stably.

[0007] As a further improvement of the above technical solution:

[0008] The support assembly includes a support device arranged at the first section and / or the last section of the corresponding screw.

[0009] The structure of the third support device is as follows: it includes a support cylinder with a hollow interior, a plurality of support plates are fixed at intervals inside the support cylinder, a mounting hole is provided on the end surface of a single support plate, and a support bearing is mounted in the single mounting hole.

[0010] A single screw comprises a screw shaft and a plurality of screw elements, wherein the screw elements are fixed at intervals on the outer circumference of the screw shaft.

[0011] The single twin-screw kneader includes a pulping cylinder with a hollow interior and a plurality of screws arranged inside the pulping cylinder;

[0012] The end of the single screw is connected to the output end of the driving motor;

[0013] The pulping cylinder comprises a first cylinder, a plurality of second cylinders, and a third cylinder arranged in sequence from the direction of material input to the direction of material output;

[0014] The driving motor drives the screw to rotate, so as to stir and mix the powder raw material and the liquid raw material in the slurry making cylinder, thereby preparing slurry.

[0015] A feed inlet is provided on the top wall or the side wall of the first cylinder, and the feed inlet is used for feeding powder raw materials or slurry.

[0016] A discharge port is provided on the bottom wall or the side wall of the third cylinder, and the discharge port is used for discharging slurry.

[0017] A liquid material inlet is provided on the top wall surface of the second cylinder, and the liquid material inlet is used for feeding liquid raw materials.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model has a compact and reasonable structure and is easy to operate. By arranging a supporting component, it can support the corresponding screw to rotate stably, thereby improving the rotation stability of the screw, reducing the friction between the screw and the inner wall of the pulping barrel, avoiding the generation of metal particles, and improving the pulping quality and pulping efficiency.

[0020] The utility model also has the following advantages:

[0021] (1) The aspect ratio of the twin screws in the present invention is less than 40, which can further reduce the friction between the screws and the inner wall of the pulping barrel, thereby improving the pulping quality, and can increase the screw speed, thereby improving the efficiency and output of continuous pulping of the twin screw pulping system.

[0022] (2) In the present invention, by providing a supporting device, a second supporting device, and a third supporting device, the use form of the supporting device is flexible and applicable to various working conditions.

[0023] (3) The pulping system of the utility model has various layout forms and can be arranged according to actual use requirements, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0025] Figure 2 It is a structural schematic diagram of another embodiment of the utility model.

[0026] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0027] Figure 4It is a schematic diagram of the installation structure of the twin-screw kneading machine and the supporting device in the utility model.

[0028] Among them: 1. Twin-screw kneading machine; 2. Driving motor; 3. Support device;

[0029] 101, first barrel; 102, second barrel; 103, third barrel; 104, feed hopper; 105, liquid material inlet; 106, screw shaft; 107, screw element;

[0030] 301, support cylinder; 302, support plate; 303, support bearing. DETAILED DESCRIPTION

[0031] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0032] like Figure 1-Figure 4 As shown, a multi-stage twin-screw pulping system includes several twin-screw kneaders 1 cascaded from the feeding direction to the discharging direction, the aspect ratio of a single screw in a single twin-screw kneader 1 is less than 40, and each screw is supported by a supporting assembly, which supports the corresponding screw to rotate stably.

[0033] The support assembly comprises a support device 3 arranged at the first section and / or the last section of the corresponding screw.

[0034] The structure of the third support device 3 is as follows: it includes a hollow support cylinder 301, a plurality of support plates 302 are fixed at intervals inside the support cylinder 301, a mounting hole is provided on the end surface of a single support plate 302, and a support bearing 303 is mounted in the single mounting hole.

[0035] A single screw includes a screw shaft 106 and a plurality of screw elements 107 . The screw elements 107 are fixed on the outer circumference of the screw shaft 106 at intervals.

[0036] A single twin-screw kneader 1 includes a pulping cylinder with a hollow interior and several screws arranged inside the pulping cylinder; the end of the single screw is connected to the output end of the driving motor 2; the pulping cylinder includes a first cylinder 101, several second cylinders 102, and a third cylinder 103 arranged in sequence from the feeding to the discharging direction; the driving motor 2 drives the screw to rotate, stirs and mixes the powder raw material and the liquid raw material in the pulping cylinder, thereby preparing a slurry.

[0037] A material inlet is provided on the top wall or the side wall of the first cylinder 101 , and the material inlet is used for feeding powder raw materials or slurry.

[0038] A discharge port is provided on the bottom wall or the side wall of the third cylinder 103, and the discharge port is used for discharging slurry.

[0039] A liquid material inlet 105 is provided on the top wall of the second cylinder 102 , and the liquid material inlet 105 is used for feeding liquid raw materials.

[0040] The specific structure and functions of the utility model are as follows:

[0041] A multi-stage twin-screw pulping system of the utility model comprises at least two twin-screw kneaders 1. For one of the twin-screw kneaders 1, the discharge port of the adjacent previous-stage twin-screw kneader 1 is connected with the feed port of the twin-screw kneader 1, and the feed port of the adjacent subsequent-stage twin-screw kneader 1 is connected with the discharge port of the twin-screw kneader 1, thereby realizing cascading from the feed to the discharge direction, improving the pulping efficiency, shortening the length of the screw in the twin-screw kneader 1, so that its aspect ratio is less than 40, and can even achieve the aspect ratio of a single screw in a single twin-screw kneader 1 of less than 28. In addition, a support assembly is installed in each twin-screw kneader 1 in the system, thereby reducing the friction between the screw and the inner wall of the pulping barrel, avoiding the generation of metal particles, and improving the pulping quality and pulping efficiency.

[0042] In the present invention, the direction from feed to discharge refers to the direction from feed to discharge of slurry.

[0043] like Figure 1-Figure 4 As shown, in the utility model, a single twin-screw kneading machine 1 is driven by a corresponding driving motor 2, and the structure of the single twin-screw kneading machine 1 is as follows: it includes a hollow pulping cylinder, and a material inlet, a plurality of liquid material inlets 105, and a material outlet are respectively provided on the wall surface of the pulping cylinder, and at least two screws are installed in the pulping cylinder, and one end of the single screw is connected to the output end of the driving motor 2;

[0044] In addition, the screw rod is connected to the driving motor 2 via a transmission box, and the transmission box is connected to the pulping cylinder via a connecting cavity.

[0045] A single pulping cylinder includes a first cylinder 101, a plurality of second cylinders 102, and a third cylinder 103 arranged in sequence from the direction of material input to the direction of material output;

[0046] A single screw includes a screw shaft 106 and a plurality of screw elements 107 . The screw elements 107 are fixed on the outer circumference of the screw shaft 106 at intervals.

[0047] The support assembly includes a support device 3. During the pulping process, two support devices 3 can be set according to actual needs and arranged at the first and last sections of the screw respectively, or one support device 3 can be set and arranged alone at the first or last section of the screw, which has high flexibility.

[0048] The support device 3 is installed on the outside of the third cylinder 103 and is sealed with the third cylinder 103. Its structure includes a support cylinder 301, a support plate 302, and a support bearing 303. The number of support bearings 303 in a single support device 3 corresponds one-to-one to the number of screws. A single support bearing 303 is installed on the outer circumferential surface of the first section and / or the tail section of the corresponding screw shaft 106, and can support the corresponding screw to rotate stably.

[0049] In the present invention, the feed inlet is provided on the top wall or the side wall of the first cylinder 101, and the feed inlet is used for feeding powder raw materials or slurry; that is, when the corresponding twin-screw kneading machine 1 is a first-stage twin-screw kneading machine, the feed inlet thereon is used for feeding powder raw materials, and the feed inlets on the other-stage twin-screw kneading machines 1 are used for feeding slurry;

[0050] A feeding hopper 104 is installed on the feeding port of the first-stage twin-screw kneading machine to facilitate the feeding of powder.

[0051] The liquid material inlet 105 is provided on the top wall surface of the second cylinder 102 , and the liquid material inlet 105 is used for feeding liquid raw materials.

[0052] The discharge port is opened on the bottom wall surface or the side wall surface of the third cylinder 103, and the discharge port is used for discharging slurry.

[0053] The powder raw material enters the pulping cylinder of the first-stage twin-screw kneading machine through the feed hopper 104 and the corresponding feed inlet.

[0054] The liquid raw material enters the corresponding twin-screw kneader 1 through the corresponding liquid material inlet 105 (the liquid raw material can be fed and supplemented through the liquid material inlet 105 on each level of the twin-screw kneader 1);

[0055] The driving motor 2 drives the corresponding screw to rotate, thereby stirring and mixing the powder raw material and the liquid raw material in the corresponding slurry making cylinder, thereby preparing a slurry;

[0056] The slurry in the twin-screw kneader 1 of the preceding stage sequentially passes through the discharge port of the twin-screw kneader 1 and the feed port of the twin-screw kneader 1 of the following stage and enters the twin-screw kneader 1 of the following stage.

[0057] like Figure 1 As shown, in one embodiment of the present invention, the twin-screw pulping system is a two-stage twin-screw pulping system;

[0058] For the sake of clarity, define Figure 1 The twin-screw kneader 1 arranged in the transverse direction is the first twin-screw kneader. Figure 1 The twin-screw kneader 1 arranged in the longitudinal direction is the second twin-screw kneader;

[0059] In the two-stage twin-screw pulping system of this embodiment, the first twin-screw kneader is a first-stage twin-screw kneader, the second twin-screw kneader is a second-stage twin-screw kneader, and the two-stage twin-screw kneader 1 adopts an upper and lower overlapping manner;

[0060] The first twin-screw kneader and the second twin-screw kneader both adopt a double support form in which two support devices 3 are arranged to support the first section and the tail section of the corresponding screw;

[0061] The discharge port of the first twin-screw kneader is located on the bottom wall of its third barrel 103, and the feed port of the second twin-screw kneader is located on the top wall of its first barrel 101. The first twin-screw kneader is arranged above the second twin-screw kneader, so that the discharge port of the first twin-screw kneader is directly connected to the feed port of the second twin-screw kneader.

[0062] The working process of this embodiment is as follows:

[0063] The powder raw material is fed through the feed port of the first twin-screw kneader, and the liquid raw material is fed through the liquid material inlet 105 of the first twin-screw kneader;

[0064] The corresponding driving motor 2 drives the screw in the first twin-screw kneading machine to rotate, and mixes the powder raw material and the liquid raw material in the slurry making cylinder to prepare slurry;

[0065] The slurry passes through the discharge port of the first twin-screw kneader and the feed port of the second twin-screw kneader and enters the slurry making cylinder of the second twin-screw kneader;

[0066] The corresponding driving motor 2 drives the screw in the second twin-screw kneading machine to rotate, further stirs the slurry in its slurry making cylinder, and finally discharges the slurry through the discharge port of the second twin-screw kneading machine, thereby completing the slurry preparation.

[0067] In another embodiment shown in the present utility model, Figure 2 As shown, the twin-screw pulping system is a two-stage twin-screw pulping system;

[0068] For the sake of clarity, define Figure 2 The twin-screw kneader 1 arranged longitudinally in the middle is the third twin-screw kneader, Figure 2 The twin-screw kneader 1 arranged in the middle along the transverse direction is the fourth twin-screw kneader;

[0069] In the two-stage twin-screw pulping system of this embodiment, the third twin-screw kneader is the first-stage twin-screw kneader, and the fourth twin-screw kneader is the second-stage twin-screw kneader; the two-stage twin-screw kneader 1 adopts a side overlap method;

[0070] like Figure 2-Figure 3As shown, the third twin-screw kneading machine adopts a support form in which a support device 3 is arranged, and the support device 3 supports the first section of the screw in the third twin-screw kneading machine. At the same time, an auxiliary support structure is also arranged inside the third twin-screw kneading machine to support the middle section of the screw in the third twin-screw kneading machine, thereby reducing the friction between the screw and the inner wall surface of the barrel in the third twin-screw kneading machine; the auxiliary support structure is a prior art and is not described in detail here;

[0071] The fourth twin-screw kneading machine adopts a double support form in which two support devices 3 are arranged, which are used to support the first section and the tail section of the screw in the fourth twin-screw kneading machine respectively;

[0072] The discharge port of the third twin-screw kneader is located on the side wall of the third barrel 103, and the feed port of the fourth twin-screw kneader is located on the side wall of the first barrel 101. The discharge port of the third twin-screw kneader is directly connected to the feed port of the fourth twin-screw kneader.

[0073] During the working process of this embodiment Figure 1 The working process of the illustrated embodiments is similar and will not be described again here.

[0074] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A multi-stage twin-screw pulping system, characterized in that: The invention comprises a plurality of twin-screw kneading machines (1) cascaded from the feeding direction to the discharging direction, wherein the aspect ratio of a single screw in a single twin-screw kneading machine (1) is less than 40, and each screw is supported by a supporting assembly, wherein the supporting assembly supports the corresponding screw to rotate stably.

2. A multi-stage twin-screw pulping system as claimed in claim 1, characterized in that: The support assembly comprises a support device (3) arranged at the first section and / or the last section of the corresponding screw.

3. A multi-stage twin-screw pulping system as claimed in claim 2, characterized in that: The structure of the support device (3) is as follows: it comprises a support cylinder (301) with a hollow interior, a plurality of support plates (302) are fixed at intervals inside the support cylinder (301), a mounting hole is provided on the end surface of a single support plate (302), and a support bearing (303) is mounted in the single mounting hole.

4. A multi-stage twin-screw pulping system as claimed in claim 1, characterized in that: A single screw comprises a screw shaft (106) and a plurality of screw elements (107), wherein the screw elements (107) are fixed at intervals on the outer circumference of the screw shaft (106).

5. A multi-stage twin-screw pulping system as claimed in claim 1, characterized in that: The single twin-screw kneader (1) comprises a pulping cylinder with a hollow interior and a plurality of screws arranged inside the pulping cylinder; The end of the single screw is connected to the output end of the driving motor (2); The pulping cylinder comprises a first cylinder (101), a plurality of second cylinders (102), and a third cylinder (103) which are sequentially arranged along the direction from material input to material output; The driving motor (2) drives the screw to rotate, stirring and mixing the powder raw material and the liquid raw material in the slurry making cylinder, thereby preparing slurry.

6. A multi-stage twin-screw pulping system as claimed in claim 5, characterized in that: A material inlet is provided on the top wall surface or the side wall surface of the first cylinder (101), and the material inlet is used for feeding powder raw materials or slurry.

7. A multi-stage twin-screw pulping system as claimed in claim 5, characterized in that: A discharge port is provided on the bottom wall or the side wall of the third cylinder (103), and the discharge port is used for discharging slurry.

8. A multi-stage twin-screw pulping system as claimed in claim 5, characterized in that: A liquid material inlet (105) is provided on the top wall surface of the second cylinder (102), and the liquid material inlet (105) is used for feeding liquid raw materials.

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