Double-screw extruder

Abstract

The utility model discloses a double-screw extruder, which relates to the technical field of electrode diaphragm preparation and comprises a machine barrel which is transversely arranged; the rotary driving mechanism is mounted at the head end of the machine barrel; the two screw rods are arranged in the machine barrel in a penetrating manner and are in transmission connection with the rotary driving mechanism, and each screw rod comprises a feeding area, a dispersing and kneading area and a discharging area which are sequentially connected in the material conveying direction; wherein the feeding area and the discharging area are both formed by combining a plurality of threaded elements, and the dispersing and kneading area is formed by combining a plurality of different forms of shearing elements and threaded elements; according to the utility model, by adopting the screw configuration of conveying, dispersing and kneading and conveying, materials can be effectively dispersed, and meanwhile, an adhesive is not excessively sheared, so that the adhesive forms a fibrillated net-shaped structure, and the bonding effect on electrode powder is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrode diaphragm preparation technical field, concretely relates to a double screw extruder. BACKGROUND

[0002] In the preparation process of super high solid content or dry electrode self-supporting diaphragm, the dispersion mixing of electrode active material and binder is realized through the double screw extruder, so that the binder bonds the active material, and then the sheet or block object is formed through the discharge head, so that the film forming equipment calenders it into a self-supporting diaphragm. Among them, the double screw extruder can realize the production of low viscosity material, and can also realize the production of high viscosity slurry, and can also fiberize the binder in dry electrode material.

[0003] However, the configuration of the screw in the current double screw extruder is not suitable for fiberizing the binder, which cannot effectively disperse the binder while avoiding excessive shearing of the binder, thereby greatly reducing the bonding effect of the binder, and even making the binder lose the bonding property. UTILITY MODEL CONTENT

[0004] The utility model discloses a double screw extruder, which solves the technical problem that the double screw extruder in the prior art cannot effectively disperse the binder while avoiding excessive shearing of the binder.

[0005] The utility model discloses a double screw extruder, which solves the technical problem that the double screw extruder in the prior art cannot effectively disperse the binder while avoiding excessive shearing of the binder.

[0006] Barrel, transverse arrangement;

[0007] Rotary drive mechanism, installed in the first end of the barrel;

[0008] Two screws, are arranged in the barrel, and are drivingly connected with the rotary drive mechanism, and the screw includes the feeding area, the dispersion kneading area and the discharge area that are sequentially connected along the material conveying direction;

[0009] Among them, the feeding area and the discharge area are combined by a plurality of screw elements, and the dispersion kneading area is combined by a plurality of different forms of shearing elements and screw elements.

[0010] The screw configuration of conveying-dispersion kneading-conveying can effectively disperse the material while avoiding excessive shearing of the binder, so that the binder forms a fibrillated network structure, thereby significantly improving the bonding effect of the electrode powder.

[0011] On the basis of the above technical scheme, the scheme of the application can also be improved as follows:

[0012] Preferably, the feeding area comprises a first conveying section, a second conveying section and a third conveying section connected in sequence; and the lead of the thread elements in the second conveying section is greater than that in the first conveying section and the third conveying section; by this scheme, the sealing effect is improved, and the output pressure is provided while ensuring the high-speed transmission of the material, so as to ensure the continuity and stability of the whole feeding process.

[0013] Preferably, the dispersion kneading area comprises a first shearing section, a first dispersion section, a second shearing section, a third shearing section, a fourth shearing section, a second dispersion section, a fifth shearing section, a sixth shearing section, a third dispersion section, a fourth dispersion section, a seventh shearing section and an eighth shearing section connected in sequence;

[0014] The thicknesses of the shearing elements in the first shearing section, the second shearing section, the fifth shearing section and the seventh shearing section are equal; the thicknesses of the shearing elements in the fourth shearing section, the sixth shearing section and the eighth shearing section are equal; and the thicknesses of the shearing elements in the first shearing section, the fourth shearing section and the third shearing section increase in turn;

[0015] The leads of the thread elements in the first dispersion section, the second dispersion section and the fourth dispersion section are equal, and the lead of the thread elements in the third dispersion section is greater than that in the fourth dispersion section; by this scheme, the material is alternately sheared and conveyed, so as to promote the mixing and homogenization of the material, realize good mixing effect, avoid over-shearing, ensure the bonding effect of the binder, and also make the shearing elements in each shearing section have different thicknesses, so as to take into account the dispersion mixing capacity and distribution mixing capacity, thereby promoting the refinement of the material and improving the spatial distribution of the material, and realizing the homogenization and performance improvement of the material in the mixing process.

[0016] Preferably, the leads of the thread elements in the first conveying section, the third conveying section and the discharging area are equal; by this scheme, the dispersion and mixing of the material are improved, the uniform distribution of the material is improved, and the conveying speed and mixing efficiency of the material are increased.

[0017] Preferably, the groove depth ratio of the thread elements is 1.3-1.5; by this scheme, a good shearing rate can be obtained, so as to improve the dispersion and mixing effect of the material and the fibrillation degree of the binder.

[0018] Preferably, the rotating driving mechanism comprises:

[0019] a one-in and two-out speed reducer, two output ends of which are connected with two screw rods respectively;

[0020] a shaft coupling, one end of which is connected with the input end of the one-in and two-out speed reducer;

[0021] The motor is connected with the other end of the shaft coupling, and has the advantages of high efficient power transmission, accurate control, strong adaptability, long service life and the like, thereby improving the overall performance and reliability of the equipment.

[0022] Preferably, the barrel is combined by multiple barrel bodies, which are integrally formed and include:

[0023] The main body has an accommodating channel and a medium flow channel inside;

[0024] The two flanges are sleeved on the two ends of the main body, and the outer periphery of one of the flanges is provided with two inlets and outlets which are in communication with the medium flow channel; the temperature in each region of the barrel can be accurately controlled, so that the fibrillation degree of the binder is improved, the binder is better combined with the electrode powder, and the electrode film is prepared.

[0025] Preferably, the barrel further includes:

[0026] The discharge head is arranged at the end of the barrel and includes a feeding block, a cooling section and a die head which are sequentially connected;

[0027] The feeding block has a connecting cavity inside, the cooling section has a feeding channel inside, and the die head has a discharge channel inside; the connecting cavity, the feeding channel and the discharge channel are sequentially communicated; the cooling section has a cooling cavity inside, and both sides of the cooling section are provided with inlet and outlet pipes which are in communication with the cooling cavity; after the material is formed into a sheet or block object, the material can be outputted, so that the subsequent film preparation equipment can be conveniently calendered, and the temperature in the feeding channel can be accurately controlled, so that the fibrillation degree of the binder is further improved.

[0028] Preferably, the feeding block is sleeved with a first limiting ring, the first end of the cooling section is sleeved with a second limiting ring, the first limiting ring and the second limiting ring are connected, and the outer periphery of the first limiting ring and the second limiting ring is jointly sleeved with a first clamp;

[0029] The end of the cooling section is sleeved with a third limiting ring, and the die head is sleeved with a fourth limiting ring; the third limiting ring and the fourth limiting ring are connected, and the outer periphery of the third limiting ring and the fourth limiting ring is jointly sleeved with a second clamp; the feeding block, the cooling section and the die head can be stably connected, the structural stability is improved, and the assembly and disassembly are facilitated, so that the maintenance efficiency is improved.

[0030] Preferably, the cooling section is composed of two cooling units; the abutting surface of the cooling units is provided with a material conveying groove for composing the material conveying channel, the cooling units are internally provided with the cooling cavity, the inlet and outlet pipes are provided in two pairs and are arranged on the two cooling units respectively, the first end of the cooling units is externally provided with a first half ring for composing the second limiting ring, and the last end of the cooling units is externally provided with a second half ring for composing the third limiting ring.

[0031] The die head is composed of two half modules; the abutting surface of the half modules is provided with a material discharging groove for composing the material discharging channel, and the half modules are externally provided with a third half ring for composing the fourth limiting ring.

[0032] Through the above technical scheme, the utility model has the following beneficial effects:

[0033] 1. The screw configuration of conveying-dispersing kneading-conveying is adopted in the application, so that the material can be effectively dispersed without being excessively sheared, so that the binder forms a fibrillated network structure, thereby significantly improving the adhesion effect on the electrode powder.

[0034] 2. The groove depth ratio of the threaded element is 1.3-1.5, so that a good shear rate can be obtained, thereby improving the dispersion and mixing effect of the material and the fibrillation degree of the binder.

[0035] 3. The temperature of each cylinder is controlled separately, so that the temperature of each region in the cylinder can be accurately controlled, thereby improving the fibrillation degree of the binder and making the binder better combined with the electrode powder, which is beneficial to the preparation of the electrode film. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0037] Figure 1 The structure diagram of the double-screw extruder according to the specific embodiments of the utility model;

[0038] Figure 2 for Figure 1 The diagram shows the structure of the screw in the twin-screw extruder.

[0039] Figure 3 for Figure 1 The diagram shows the structure of the inner barrel of the twin-screw extruder.

[0040] Figure 4 for Figure 1 A schematic cross-sectional view of the discharge head in the twin-screw extruder shown;

[0041] Figure 5 for Figure 1 The diagram shows the assembly of the discharge head in a twin-screw extruder.

[0042] Figure 6 for Figure 1 The diagram shows the structure of the discharge head in the twin-screw extruder.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Barrel; 2. Rotary drive mechanism; 3. Screw; 4. Discharge head;

[0045] 11. Cylinder; 21. One-in-two-out reducer; 22. Coupling; 23. Motor; 31. Feeding area; 32. Dispersion and kneading area; 33. Discharge area; 41. Conveying block; 42. Cooling section; 43. Die head; 44. First clamp; 45. Second clamp;

[0046] 111. Main body; 112. Flange; 311. First conveying section; 312. Second conveying section; 313. Third conveying section; 321. First shearing section; 322. First dispersing section; 323. Second shearing section; 324. Third shearing section; 325. Fourth shearing section; 326. Second dispersing section; 327. Fifth shearing section; 328. Sixth shearing section; 329. Third dispersing section; 32A. Fourth dispersing section; 32B. Seventh shearing section; 32C. Eighth shearing section; 411. Connecting cavity; 412. First limiting ring; 421. Material conveying channel; 422. Cooling cavity; 423. Inlet / outlet pipe; 424. Second limiting ring; 425. Third limiting ring; 42a. Cooling unit; 431. Discharge channel; 432. Fourth limiting ring; 43a. Half module;

[0047] 1111, receiving channel; 1112, medium flow channel; 1121, inlet / outlet; 42a1, material conveying groove; 42a2, first half ring; 42a3, second half ring; 43a1, material discharge groove; 43a2, third half ring. Detailed Implementation

[0048] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and therefore only serve as examples, and cannot limit the protection scope of the utility model.

[0049] First of all, it needs to be pointed out that in the following description, some orientation words involved for clearly illustrating the technical scheme of the utility model, such as the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are all analogically possessed of the meanings according to the orientation of the normal parts in the double-screw extruder, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0050] In addition, the terms "first", "second" and the like are only used for the purpose of description, and cannot be understood as indicative or suggestive of relative importance or implicitly indicating the number of the technical features indicated, and therefore the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be direct connection, or indirect connection through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0052] In order to better understand the above technical scheme, the above technical scheme will be described in detail below with reference to the drawings and specific embodiments.

[0053] Embodiment:

[0054] As Figure 1 shown, the embodiment of the present application discloses a double-screw extruder for dispersing and mixing electrode active material and binder, and making the binder fibrous, so as to bond the electrode active material, and the specific structure comprises: a barrel 1, a rotary driving mechanism 2 and two screws 3.

[0055] The barrel 1 is arranged transversely, and is used for accommodating and guiding the material to perform the extrusion process inside.

[0056] The rotary driving mechanism 2 is installed at the first end of the barrel 1, and is used for providing power to drive the two screws 3 to rotate.

[0057] Two screw rods 3 are arranged in the barrel 1 and are in transmission connection with the rotating driving mechanism 2, for realizing dispersion mixing and shearing of the material through rotation.

[0058] Specifically, the screw rod 3 comprises a feeding area 31, a dispersion kneading area 32 and a discharging area 33 which are sequentially connected along the material conveying direction, and are arranged as follows:

[0059] The feeding area 31 is combined by a plurality of threaded elements, for conveying the component materials to the dispersion kneading area 32;

[0060] The dispersion kneading area 32 is combined by a plurality of different forms of shearing elements and threaded elements, for shearing, dispersing and kneading the material;

[0061] The discharging area 33 is also combined by a plurality of threaded elements, for smoothly extruding the mixed and fibrillated material out of the barrel 1 and providing stable output pressure.

[0062] The utility model discloses a screw rod configuration of conveying-dispersion kneading-conveying, which can effectively disperse the material without over-shearing the binder, so as to form a fibrillated network structure of the binder, thereby significantly improving the adhesion effect on the electrode powder.

[0063] In some embodiments, as shown in Figure 2 The second conveying section 312 is connected with the first conveying section 311 and the third conveying section 313 in sequence; and the pitch of the threaded elements in the second conveying section 312 is greater than that in the first conveying section 311 and the third conveying section 313.

[0064] It should be noted that the threaded elements in the first conveying section 311 are designed with a small pitch, for preventing the material from approaching the first end of the barrel 1, thereby improving the sealing effect; the threaded elements in the second conveying section 312 are designed with a large pitch, which helps to accelerate the conveying speed of the material and realize efficient transmission of the material; and the threaded elements in the third conveying section 313 are designed with a small pitch, for feeding the material into the dispersion kneading area 32 and providing appropriate output pressure.

[0065] Through the above arrangement, the sealing effect is improved, and appropriate output pressure can be provided while ensuring high-speed transmission of the material, thereby ensuring the continuity and stability of the entire feeding process.

[0066] In some embodiments, as shown in Figure 2As shown, the dispersion kneading area 32 comprises a first shear section 321, a first dispersion section 322, a second shear section 323, a third shear section 324, a fourth shear section 325, a second dispersion section 326, a fifth shear section 327, a sixth shear section 328, a third dispersion section 329, a fourth dispersion section 32A, a seventh shear section 32B and an eighth shear section 32C connected in sequence.

[0067] Through the above arrangement, the material alternately performs shearing and conveying, so as to promote the material to be fully mixed and homogenized, achieve good mixing effect, avoid over-shearing, and protect the bonding effect of the binder.

[0068] In the embodiment, the thicknesses of the shear elements in the first shear section 321, the second shear section 323, the fifth shear section 327 and the seventh shear section 32B are equal; the thicknesses of the shear elements in the fourth shear section 325, the sixth shear section 328 and the eighth shear section 32C are equal; and the thicknesses of the shear elements in the first shear section 321, the fourth shear section 325 and the third shear section 324 increase in turn.

[0069] It should be noted that the thicker the shear element is, the stronger the dispersion mixing ability is, and the weaker the distribution mixing ability is.

[0070] Through the above arrangement, the shear elements in each shear section have different thicknesses, so as to take into account the dispersion mixing ability and the distribution mixing ability, promote the refinement of the material, improve the spatial distribution of the material, and achieve the homogenization and performance improvement of the material in the mixing process.

[0071] In the embodiment, the pitches of the thread elements in the first dispersion section 322, the second dispersion section 326 and the fourth dispersion section 32A are equal, and the pitch of the thread element in the third dispersion section 329 is greater than that of the fourth dispersion section 32A.

[0072] Through the above arrangement, the material is dispersed and mixed, the uniform distribution of the material is improved, and the conveying speed and mixing efficiency of the material are increased.

[0073] On the basis of the above embodiment, the pitches of the thread elements in the first conveying section 311, the third conveying section 313 and the discharge area 33 are equal, for outputting the material and providing stable output pressure.

[0074] In some embodiments, the groove depth ratio of the thread element is 1.3-1.5, which can obtain a good shearing rate, so as to improve the dispersion mixing effect of the material and the fibrillation degree of the binder.

[0075] It should be noted that the binder fibrillation refers to: through a specific process method, such as high shear force, electric field application, etc., the molecular chain of the binder is expanded and the fibrous structure is formed, the binder after fibrillation has higher specific surface area and stronger mechanical strength, which can significantly improve the performance of the composite material and better adhere to the electrode powder, and is widely used in the field of new energy batteries for the preparation of reinforced composite materials and functional film materials.

[0076] As shown in some embodiments, Figure 1 The rotating drive mechanism 2 includes a one-in-two-out speed reducer 21, a shaft coupling 22 and a motor 23, which are arranged as follows:

[0077] The two output ends of the one-in-two-out speed reducer 21 are respectively connected with the two screws 3, for synchronously driving the two screws 3 to rotate and reducing the rotating speed and increasing the torque;

[0078] One end of the shaft coupling 22 is connected with the input end of the one-in-two-out speed reducer 21, for realizing smooth and uninterrupted transmission of the rotating power, and also compensating the axial, radial and angular displacements caused by installation errors, working deformations and other factors, to ensure the stable operation of the transmission;

[0079] The output end of the motor 23 is connected with the other end of the shaft coupling 22, for providing the rotating power.

[0080] The design of the rotating drive mechanism 2 has the remarkable effects of efficient power transmission, accurate control, strong adaptability and long service life, etc., so as to improve the overall performance and reliability of the equipment.

[0081] Preferably, the rotating drive mechanism 2 further includes a protective cover, which is arranged outside the shaft coupling 22, for avoiding the interference of the shaft coupling 22 by the external environment and improving the transmission stability.

[0082] In some embodiments, the barrel 1 is composed of multiple barrel bodies 11, so as to facilitate the production, manufacturing, disassembly and maintenance.

[0083] Specifically, the barrel body 11 is an integral molded part, which includes a main body 111 and two flanges 112, arranged as follows:

[0084] The main body 111 has an accommodating channel 1111 for accommodating the screw 3 and a medium flow channel 1112 for circulating and flowing the heat exchange medium in the barrel body 11, to realize the heat exchange function;

[0085] Two flanges 112 are sleeved on both ends of the main body 111, which not only plays a role of reinforcing structure, but also provides an interface for connecting with other barrels 11 or devices; and the outer periphery of one flange 112 is provided with two inlets and outlets 1121 which are connected with the medium flow channel 1112, which ensures that the heat exchange medium can flow in and out of the medium flow channel 1112 smoothly.

[0086] In use, the mold temperature machine is communicated with the two inlets and outlets 1121 on each barrel 11 respectively, so that the temperature of each barrel 11 can be controlled individually, and the accurate temperature control of each barrel 11 is realized.

[0087] Through the above setting, the temperature of each region in the barrel 1 can be accurately controlled, so as to improve the fibrillation degree of the binder, and the binder can be better combined with the electrode powder, which is beneficial to the preparation of the electrode film.

[0088] In some embodiments, as shown in Figure 1 and Figure 4 , it further comprises a discharge head 4 provided at the end of the barrel 1, which comprises a feeding block 41, a cooling section 42 and a die head 43 which are connected in sequence. The feeding block 41 has a connecting cavity 411 inside, the cooling section 42 has a feeding channel 421 inside, and the die head 43 has a discharge channel 431 inside; the connecting cavity 411, the feeding channel 421 and the discharge channel 431 are communicated in sequence; the cooling section 42 has a cooling cavity 422 inside, and the cooling section 42 is provided with two inlet and outlet pipes 423 on both sides outside, which are communicated with the cooling cavity 422.

[0089] In use, the material is plasticized into sheet or block objects after passing through the connecting cavity 411, the feeding channel 421 and the discharge channel 431 in sequence, and then is conveyed to the subsequent film making equipment for calendering; at the same time, the mold temperature machine is communicated with the two inlet and outlet pipes 423 on the cooling section 42, so that the temperature in the feeding channel 421 can be accurately controlled, and the fibrillation degree of the binder is further improved.

[0090] Preferably, the widths of the connecting cavity 411, the feeding channel 421 and the discharge channel 431 are the same, and the thickness gradually thins from the end of the barrel 11 to the outlet, which plays a role of guiding the movement of the material and improves the conveying smoothness.

[0091] By setting the discharge head 4, the material can be outputted after being plasticized into sheet or block objects, which can facilitate the calendering of the subsequent film making equipment, and the temperature in the feeding channel 421 can be accurately controlled, so as to further improve the fibrillation degree of the binder.

[0092] On the basis of the above embodiments, as shown in Figure 4 and Figure 5As shown, the feeding block 41 is sleeved with a first limiting ring 412, the first end of the cooling section 42 is sleeved with a second limiting ring 424, the first limiting ring 412 and the second limiting ring 424 are opposite to each other, and the outer periphery of the two is jointly sleeved with the first clamp 44.

[0093] The end of the cooling section 42 is sleeved with a third limiting ring 425, and the die head 43 is sleeved with a fourth limiting ring 432; the third limiting ring 425 and the fourth limiting ring 432 are opposite to each other, and the outer periphery of the two is jointly sleeved with the second clamp 45.

[0094] Through the above setting, the stable butt joint between the feeding block 41, the cooling section 42 and the die head 43 can be realized, the structural stability is improved, and the assembly and disassembly are facilitated, and the maintenance efficiency is improved.

[0095] In the embodiment, as shown in Figure 4 and Figure 5 As shown, the cooling section 42 is composed of two cooling monomers 42a; the butt joint surface of the cooling monomer 42a is provided with a feeding groove 42a1 for splitting to form a feeding channel 421, the cooling monomer 42a has a cooling cavity 422 inside, the inlet and outlet pipes 423 have two pairs and are arranged on the two cooling monomers 42a respectively, the first half ring 42a2 for splitting to form the second limiting ring 424 is arranged outside the first end of the cooling monomer 42a, and the second half ring 42a3 for splitting to form the third limiting ring 425 is arranged outside the end of the cooling monomer 42a; the die head 43 is composed of two half modules 43a, the butt joint surface of the half module 43a is provided with a discharging groove 43a1 for splitting to form a discharging channel 431, and the third half ring 43a2 for splitting to form the fourth limiting ring 432 is arranged outside the half module 43a.

[0096] Through the above setting, the feeding channel 421 and the discharging channel 431 can be subjected to finishing processing, so that the inner wall smoothness can be improved, the resistance to the material is reduced, the material is easy to pass through, and after a period of production, the cooling monomer 42a and the half module 43a can be split to clean the inside of the feeding channel 421 and the discharging channel 431, so that the long-term conveying effect is improved, and the maintenance and repair are facilitated.

[0097] In the specification of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail, so as not to obscure the understanding of the specification.

[0098] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A twin-screw extruder, characterized by, The utility model relates to a twin-screw extruder, comprising: a barrel arranged transversely; a rotary drive mechanism mounted at the first end of the barrel; two screw rods arranged in the barrel and connected to the rotary drive mechanism, wherein the screw rods comprise, in the direction of material transport, a feeding zone, a dispersion kneading zone and a discharging zone in sequence; wherein the feeding zone and the discharging zone are each composed of a plurality of threaded elements, and the dispersion kneading zone is composed of a plurality of different forms of shearing elements and threaded elements.

2. Twin screw extruder according to claim 1, characterized in that The feeding zone comprises a first conveying section, a second conveying section and a third conveying section connected in sequence; and the pitch of the threaded elements in the second conveying section is greater than that in the first conveying section and the third conveying section.

3. The twin-screw extruder of claim 1, wherein The dispersion kneading zone comprises a first shearing section, a first dispersion section, a second shearing section, a third shearing section, a fourth shearing section, a second dispersion section, a fifth shearing section, a sixth shearing section, a third dispersion section, a fourth dispersion section, a seventh shearing section and an eighth shearing section connected in sequence; the thickness of the shearing elements in the first shearing section, the second shearing section, the fifth shearing section and the seventh shearing section is equal; the thickness of the shearing elements in the fourth shearing section, the sixth shearing section and the eighth shearing section is equal; and the thickness of the shearing elements in the first shearing section, the fourth shearing section and the third shearing section increases in sequence; the pitch of the threaded elements in the first dispersion section, the second dispersion section and the fourth dispersion section is equal, and the pitch of the threaded elements in the third dispersion section is greater than that in the fourth dispersion section.

4. The twin-screw extruder of claim 2, wherein The pitch of the threaded elements in the first conveying section, the third conveying section and the discharging zone is equal.

5. The twin screw extruder of claim 1, wherein, The groove depth ratio of the threaded elements is 1.3-1.

5.

6. The twin screw extruder of claim 1, wherein, The rotary drive mechanism comprises: a one-in and two-out speed reducer, two output ends of which are connected to the two screw rods respectively; a shaft coupling, one end of which is connected to the input end of the one-in and two-out speed reducer; a motor, the output end of which is connected to the other end of the shaft coupling.

7. The twin screw extruder of claim 1, wherein, The barrel is composed of a plurality of barrel bodies, which are integrally formed and comprise: a main body, which has an accommodating channel and a medium flow channel inside; two flanges, which are sleeved on the two ends of the main body, and one of the flanges has two inlets and outlets connected to the medium flow channel formed on the outer periphery thereof.

8. The twin screw extruder of claim 1, wherein, Further comprising: a discharging head provided at the end of the barrel, which comprises a conveying block, a cooling section and a die head connected in sequence; wherein the conveying block has a connecting cavity inside, the cooling section has a conveying channel inside, and the die head has a discharging channel inside; the connecting cavity, the conveying channel and the discharging channel are connected in sequence; the cooling section has a cooling cavity inside, and both sides of the cooling section have inlet and outlet pipes outside, which are connected to the cooling cavity.

9. Twin screw extruder according to claim 8, characterized in that The conveying block is sleeved with a first limiting ring, the first end of the cooling section is sleeved with a second limiting ring, the first limiting ring and the second limiting ring are connected to each other, and the outer periphery of both is jointly sleeved with a first clamp; the end of the cooling section is sleeved with a third limiting ring, and the die head is sleeved with a fourth limiting ring; the third limiting ring and the fourth limiting ring are connected to each other, and the outer periphery of both is jointly sleeved with a second clamp.

10. Twin screw extruder according to claim 9, characterized in that The cooling section is composed of two cooling units; the butt joint surface of the cooling units is provided with a feeding groove for forming the feeding channel, the cooling unit has the cooling cavity inside, the inlet and outlet pipes are provided on the two cooling units respectively, the first half ring for forming the second limiting ring is arranged on the head end of the cooling unit, and the second half ring for forming the third limiting ring is arranged on the tail end of the cooling unit. The die head is composed of two half modules; the butt joint surface of the half modules is provided with a feeding groove for forming the feeding channel, and the third half ring for forming the fourth limiting ring is arranged on the half module.

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