Premixing tank for carbon nanotube conductive slurry

Abstract

The utility model discloses a premixing tank for carbon nano tube conductive slurry, which comprises a cooling jacket, a kettle body is arranged in the cooling jacket, a stirring support, a liquid feeding hole, a powder feeding hole and a spraying ball assembly are arranged at the upper part of the kettle body, a stirring device is arranged in the kettle body, the stirring device comprises a low-speed helical ribbon stirrer and a high-speed shearing stirrer, a stirring shaft of the high-speed shearing stirrer penetrates through a hollow shaft of the low-speed helical ribbon stirrer and is directly connected with the high-speed driving motor, and the hollow shaft of the low-speed helical ribbon stirrer is driven by the low-speed driving motor and the speed reducer. The premixing tank solves the problems of agglomeration of carbon nanotube powder, inconsistent upper and lower uniformity, material adhesion on the kettle wall, uneven overall temperature and the like in the existing mixing tank, effectively avoids uneven mixing caused by long-term adhesion of the material on the kettle wall, can scrape off the material adhered on the kettle wall when discharging the material, reduces material residues, and improves the production efficiency. And the device can be widely applied to mixing occasions of carbon nanotubes and other slurries.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy lithium electric slurry manufacturing technical field, especially a kind of premixing tank for carbon nanotube conductive slurry. BACKGROUND

[0002] Carbon nanotube is one-dimensional quantum material with special structure, its radial dimension is nanometer order, axial dimension is micron order, and it has many abnormal mechanical, chemical and electrical properties. Due to its excellent electrical conductivity, carbon nanotube and other raw materials are mixed to form conductive slurry, which is mixed with the positive electrode of lithium battery to form the positive electrode material of lithium battery. The conductive slurry can effectively improve the electrical conductivity of the battery, form a conductive network to improve the cycle performance of the battery, increase the specific capacity and rate performance of the battery, stabilize the mechanism of the electrode, and promote the transmission of lithium ions in the electrode.

[0003] When carbon nanotube conductive slurry is mixed in the stirring mixing tank, carbon nanotube as a solid powder material will float on the upper part of the liquid after being added to the kettle, and due to the interaction force between the powder particles, agglomeration and clumping phenomenon is easy to occur, which leads to poor uniformity of the slurry. Due to the large viscosity and poor flowability of the slurry, the material adhering to the wall of the tank is easy to form, the mixing uniformity is poor, and the wall hanging material cannot be completely discharged during discharge. At present, anchor frame stirring can only form circumferential rotation flow, and cannot form good internal and external circulation flow, so the uniformity of the material cannot be guaranteed. SUMMARY

[0004] The utility model aims at solving the above-mentioned problem, and designs a premixing tank for carbon nanotube conductive slurry.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is a premixing tank for carbon nanotube conductive slurry, which comprises a cooling jacket, a kettle body is arranged in the cooling jacket, a stirring support, a liquid feeding port, a powder feeding port and a spray ball assembly are arranged on the upper part of the kettle body, a stirring device is arranged in the kettle body, the stirring device comprises a low-speed spiral belt stirrer and a high-speed shearing stirrer, the stirring shaft of the high-speed shearing stirrer is directly connected through the hollow shaft of the low-speed spiral belt stirrer and a high-speed drive motor, the hollow shaft of the low-speed spiral belt stirrer is driven by a low-speed drive motor and a speed reducer, and reliable mechanical seals are arranged on the low-speed spiral belt stirrer and the high-speed shearing stirrer to isolate the atmosphere and the space in the kettle.

[0006] As a further description of the technical solution, the kettle body includes a bottom conical head, an intermediate straight cylinder section is arranged on the bottom conical head, a cylinder head inter-device flange is arranged on the intermediate straight cylinder section, an upper elliptical head is arranged on the cylinder head inter-device flange, a stirring support is arranged on the upper elliptical head, and the stirring device further comprises a low-speed driving motor, a low-speed stirring speed reducer, a high-speed driving motor, a mounting bracket, and a four-fluorine scraper assembly.

[0007] As a further description of the technical solution, the low-speed stirring speed reducer is a hollow shaft structure, the low-speed spiral belt stirrer comprises a hollow low-speed stirring shaft, the hollow low-speed stirring shaft passes through the hollow shaft of the low-speed stirring speed reducer and is fixed by a locking disc, the high-speed shear stirrer comprises a high-speed stirring shaft, the high-speed stirring shaft passes through the hollow low-speed stirring shaft, and rolling bearings are arranged between the two shafts to ensure that the two shafts can rotate at different speeds.

[0008] As a further description of the technical solution, the low-speed spiral belt stirrer comprises a support rod component connected with the hollow low-speed stirring shaft, two spiral blade leaves are arranged on the support rod component, and an inclined blade scraper stirrer is arranged at the bottom of the support rod component.

[0009] As a further description of the technical solution, the four-fluorine scraper assembly comprises a support plate, a four-fluorine scraper with an inclined edge is connected to the support plate through a rotating pin shaft, spring pressing plates are arranged on both sides of the four-fluorine scraper above the rotating pin shaft, and adjusting bolt assemblies are arranged at both ends of the rotating pin shaft.

[0010] As a further description of the technical solution, the high-speed shear stirrer comprises a connecting paddle sleeve arranged on the high-speed stirring shaft, the connecting paddle sleeve is fixed on the high-speed stirring shaft through a transmission key, sawtooth disc blades are arranged on the paddle sleeve, and the sawtooth disc blades are fixed on the paddle sleeve by welding.

[0011] As a further description of the technical solution, the four-fluorine scraper assembly is welded on the support rod component of the low-speed spiral belt stirrer through the support plate, so that the front end of the four-fluorine scraper is tightly attached to the inner wall of the kettle body.

[0012] The premixing tank has the advantages that the premixing tank has a novel structure, high practicability, and the problems of agglomeration of carbon nanotube powder, inconsistency of up-down uniformity, adhesion of material to the kettle wall, and uneven overall temperature are solved, the material is prevented from being adhered to the kettle wall for a long time to cause uneven mixing, the material adhered to the kettle wall can be scraped off when the material is discharged, the residue of the material is reduced, and the premixing tank can be widely applied to mixing occasions of carbon nanotube and other slurries. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a general schematic view of the premixing tank of the utility model;

[0014] Figure 2 It is a structural schematic view of the low-speed spiral belt stirrer;

[0015] Figure 3 It is a structural schematic view of the four-fluorine scraper assembly;

[0016] Figure 4 It is a structural schematic view of the high-speed shearing stirrer.

[0017] In the drawing, 1 is a cooling jacket, 2 is a kettle body, 201 is a stirring support, 4 is a liquid feeding port, 5 is a low-speed driving motor, 6 is a low-speed stirring speed reducer, 7 is a mounting support, 8 is a high-speed driving motor, 9 is a powder feeding port, 10 is a low-speed spiral belt stirrer, 1001 is a hollow low-speed stirring shaft, 1002 is a spiral belt blade, 1003 is a support rod component, 1004 is an inclined blade scraper stirrer, 11 is a four-fluorine scraper assembly, 1101 is a four-fluorine scraper, 1102 is a spring pressing plate, 1103 is a rotating pin shaft, 1104 is a support plate, 1105 is an adjusting bolt assembly, 12 is a high-speed shearing stirrer, 1201 is a high-speed stirring shaft, 1202 is a paddle sleeve, 1203 is a transmission key, 1204 is a sawtooth disc blade, 13 is a spraying ball assembly, and 14 is a liquid outlet. DETAILED DESCRIPTION

[0018] Firstly, the design intention of the utility model is described, when carbon nanotube conductive slurry is mixed in the stirring mixing tank, since the carbon nanotube is a solid powder material, the carbon nanotube floats on the upper part of the liquid after being added into the kettle, meanwhile, the agglomeration phenomenon is prone to occur due to the interaction force between the powder particles, thereby leading to poor uniformity of the slurry. Since the viscosity of the slurry is large and the flowability is poor, the adhesion of the material to the kettle wall is prone to occur on the inner wall of the kettle, the mixing uniformity is poor, the wall hanging material cannot be completely discharged when the material is discharged, currently, the anchor frame type stirring can only form the circumferential rotation flow, and cannot form the good internal and external circulation flow, therefore, the premixing tank for the carbon nanotube conductive slurry is designed.

[0019] The utility model will be specifically described in combination with the drawings as follows, Figures 1-4As shown, a premixing tank for carbon nanotube conductive paste comprises a cooling jacket 1, a kettle body 2 arranged in the cooling jacket 1, a stirring support 201, a liquid feeding port 4, a powder feeding port 9, a spray ball assembly 13 arranged on the upper portion of the kettle body 2, and a liquid outlet 14 arranged on the bottom of the kettle body 2. The kettle body 2 is internally provided with a stirring device comprising a low-speed spiral stirring device 10 and a high-speed shearing stirring device 12. The stirring shaft of the high-speed shearing stirring device 12 is directly connected to the hollow shaft of the low-speed spiral stirring device 10 and a high-speed driving motor 8. The hollow shaft of the low-speed spiral stirring device 10 is driven by a low-speed driving motor 5 and a low-speed stirring speed reducer 6. The low-speed spiral stirring device 10 and the high-speed shearing stirring device 12 are both provided with reliable mechanical seals to isolate the atmosphere and the internal space of the kettle.

[0020] The kettle body 2 comprises a bottom conical head, an intermediate straight cylinder segment arranged on the bottom conical head, a cylinder head inter-device flange arranged on the intermediate straight cylinder segment, an upper elliptical head arranged on the cylinder head inter-device flange, and the stirring support 201 arranged on the upper elliptical head. The stirring device further comprises the low-speed driving motor 5, the low-speed stirring speed reducer 6, the high-speed driving motor 8, a mounting bracket 7, and a four-fluorine scraper assembly 11. The output end of the low-speed driving motor 5 is provided with the low-speed stirring speed reducer 6, and the low-speed stirring speed reducer 6 is arranged on the stirring support 201.

[0021] The mounting bracket 7 is arranged above the low-speed stirring speed reducer 6 for facilitating the installation of the high-speed driving motor 8. The high-speed driving motor 8 is arranged on the mounting bracket 7, and the output end of the high-speed driving motor 8 is connected to the high-speed shearing stirring device 12. The output end of the low-speed stirring speed reducer 6 is connected to the low-speed spiral stirring device 10.

[0022] The low-speed spiral stirring device 10 is described in detail as follows. The low-speed stirring speed reducer 6 is a hollow shaft structure. The low-speed spiral stirring device 10 comprises a hollow low-speed stirring shaft 1001 which penetrates the hollow shaft of the low-speed stirring speed reducer 6 and is fixed by a locking disc. The high-speed shearing stirring device 12 comprises a high-speed stirring shaft 1201 which penetrates the hollow low-speed stirring shaft 1001. Rolling bearings are arranged between the two shafts to ensure that the two shafts can rotate at different speeds.

[0023] The low-speed spiral ribbon agitator 10 comprises a support rod component 1003 connected with a hollow low-speed stirring shaft 1001, two spiral ribbon blades 1002 are arranged on the support rod component 1003, and an inclined blade scraper agitator 1004 is arranged at the bottom of the support rod component 1003; the four-fluorine scraper assembly 11 is welded on the support rod component 1003 of the low-speed spiral ribbon agitator through a support plate 1104, so that the front end of the four-fluorine scraper 1101 is tightly attached to the inner wall of the cylinder 2.

[0024] The low-speed spiral ribbon agitator 10 is driven by a low-speed driving motor 5, the rotation of the low-speed driving motor 5 is decelerated by a hollow shaft reducer, the low-speed spiral ribbon agitator 10 is connected with the low-speed hollow shaft through a bolt gland, and the four-fluorine scraper assembly 11 is connected on the support rod of the low-speed spiral ribbon agitator 10. The spiral ribbon blade 1002 and the inclined blade scraper agitator 1004 rotate to generate axial circulating flow, so that the internal and external axial mixing of the materials in the cylinder is realized, and the mixing efficiency of the solid powder and the liquid is increased; the four-fluorine scraper 1101 with a sharp end in the four-fluorine scraper assembly 11 is tightly attached to the inside of the kettle body, and the materials adhered to the kettle wall are scraped off during the low-speed stirring rotation process, so that the materials adhered to the kettle wall are prevented from being not updated to flow and cause uneven material concentration, and the residual materials are prevented from being discharged.

[0025] The four-fluorine scraper assembly 11 will be described in detail below, which comprises a support plate 1104, a four-fluorine scraper 1101 with an inclined edge is connected to the support plate 1104 through a rotating pin shaft 1103, spring pressing pieces 1102 are arranged on both sides of the four-fluorine scraper 1101 above the rotating pin shaft 1103, and adjusting bolt assemblies 1105 are arranged at both ends of the rotating pin shaft 1103.

[0026] The high-speed shearing agitator 12 will be described in detail below, which comprises a connecting paddle sleeve 1202 arranged on a high-speed stirring shaft 1201, the connecting paddle sleeve 1202 is fixed on the high-speed stirring shaft 1201 through a transmission key 1203, and sawtooth disc blades 1204 are arranged on the paddle sleeve 1202; the sawtooth disc blades 1204 are fixed on the paddle sleeve 1202 through welding.

[0027] The high-speed shearing stirrer 12 has a sawtooth structure, and generates strong shearing effect when rotating at high speed, so that the powder fed into the kettle can be quickly dispersed and uniformly distributed; the low-speed spiral belt stirrer 10 generates the effect of pulling the material on the outside, so that the material in the kettle forms axial circulation inside and outside, effectively eliminating the concentration difference of the material at different positions in the kettle; the four-fluorine scraper assembly 11 on the outside can effectively scrape the material adhered to the kettle wall, reduce the dead zone of the material on the kettle wall and the residue of the material, and at the same time, strengthen the convection heat transfer of the kettle wall; the problems of agglomeration of carbon nanotube powder, inconsistency of uniformity from top to bottom, adhesion of the material to the kettle wall, and uneven overall temperature of the existing mixing kettle are solved, and the premixing kettle can be widely applied to mixing occasions of carbon nanotube and other slurries.

[0028] In use, liquid material is first fed into the cylinder through the liquid feeding port 4, and the high-speed stirring and low-speed stirring are started, and the rotating speed of the stirring can be controlled by the frequency converter. The cooling water inlet and outlet of the cooling jacket 1 is connected, and the material is cooled. The carbon nanotube powder is fed through the solid feeding port 9, and the rotating speed of the stirring is adjusted, so that the solid powder is quickly dispersed into the liquid to form uniform slurry material. After the material is uniformly stirred, the high-speed stirring is stopped, and the material is discharged through the liquid outlet 14, and the low-speed spiral belt stirring is operated at low speed during the discharging process, and the four-fluorine scraper effectively scrapes the material adhered to the kettle wall, so that complete discharge is ensured and the residue of the material is reduced. The spray ball is arranged on the head of the cylinder 2, and the spray ball sprays liquid material for a short time to simply clean the accessories in the kettle. Then, the next step of material preparation is performed. When the product brand is changed, the top spray can be used for cleaning, so that cross contamination of the material is avoided.

[0029] The premixing kettle has a clever structure and high practicability, solves the problems of agglomeration of carbon nanotube powder, inconsistency of uniformity from top to bottom, adhesion of the material to the kettle wall, and uneven overall temperature of the existing mixing kettle, effectively avoids that the material is adhered to the kettle wall for a long time to cause uneven mixing, the material adhered to the kettle wall can be scraped during discharging of the material, the residue of the material is reduced, and the premixing kettle can be widely applied to mixing occasions of carbon nanotube and other slurries.

[0030] The above technical scheme only reflects the preferred technical scheme of the premixing kettle, and some changes made by the person skilled in the art to some parts of the premixing kettle also reflect the principle of the premixing kettle and belong to the protection scope of the premixing kettle.

Claims

1. A premixing tank for carbon nanotube conductive slurry, characterized in that, The system includes a cooling jacket (1), a vessel body (2) is provided inside the cooling jacket (1), a stirring support (201), a liquid inlet (4), a powder feeding inlet (9), and a spray ball assembly (13) are provided on the upper part of the vessel body (2). A stirring device is provided inside the vessel body (2), which includes a low-speed ribbon agitator (10) and a high-speed shear agitator (12). The stirring shaft of the high-speed shear agitator (12) passes through the hollow shaft of the low-speed ribbon agitator (10) and is directly connected to the high-speed drive motor (8). The hollow shaft of the low-speed ribbon agitator (10) is driven by a low-speed drive motor (5) and a reducer (6). Both the low-speed ribbon agitator (10) and the high-speed shear agitator (12) are equipped with reliable mechanical seals to isolate the atmosphere and the space inside the vessel.

2. A premixing tank for carbon nanotube conductive slurry according to claim 1, characterized in that, The vessel body (2) includes a bottom conical head, a middle straight section is provided on the bottom conical head, a vessel head between equipment flanges is provided on the middle straight section, an upper elliptical head is provided on the vessel head between equipment flanges, and a stirring support (201) is provided on the upper elliptical head. The stirring device also includes a low-speed drive motor (5), a low-speed stirring reducer (6), a high-speed drive motor (8), a mounting bracket (7), and a PTFE scraper assembly (11). The output end of the low-speed drive motor (5) is provided with a reducer (6), the low-speed stirring reducer (6) is provided on the stirring support (201), the mounting bracket (7) is provided above the low-speed stirring reducer (6), the high-speed drive motor (8) is provided on the mounting bracket (7), the output end of the high-speed drive motor (8) is connected to a high-speed shearing stirrer (12), and the output end of the reducer (6) is connected to a low-speed ribbon stirrer (10).

3. A premixing tank for carbon nanotube conductive slurry according to claim 2, characterized in that, The low-speed mixing reducer (6) has a hollow shaft structure. The low-speed ribbon mixer (10) includes a hollow low-speed mixing shaft (1001). The hollow low-speed mixing shaft (1001) passes through the hollow shaft of the low-speed mixing reducer (6) and is fixed by a locking disc. The high-speed shear mixer (12) includes a high-speed mixing shaft (1201). The high-speed mixing shaft (1201) passes through the hollow low-speed mixing shaft (1001). A rolling bearing is provided between the two shafts to ensure that the two shafts can rotate at different speeds.

4. A premixing tank for carbon nanotube conductive slurry according to claim 3, characterized in that, The low-speed ribbon agitator (10) includes a support rod component (1003) connected to a hollow low-speed agitation shaft (1001), two ribbon blades (1002) are provided on the support rod component (1003), and an inclined blade scraper agitator (1004) is provided at the bottom of the support rod component (1003).

5. A premixing tank for carbon nanotube conductive slurry according to claim 4, characterized in that, The PTFE scraper assembly (11) includes a support plate (1104), on which a PTFE scraper (1101) with a bevel is connected via a rotating pin (1103). Spring pressure plates (1102) are provided on both sides of the PTFE scraper (1101) on the rotating pin (1103), and adjusting bolt assemblies (1105) are provided at both ends of the rotating pin (1103).

6. A premixing tank for carbon nanotube conductive slurry according to claim 3, characterized in that, The high-speed shear mixer (12) includes a connecting paddle sleeve (1202) disposed on a high-speed mixing shaft (1201). The connecting paddle sleeve (1202) is fixed to the high-speed mixing shaft (1201) by a transmission key (1203). The paddle sleeve (1202) is provided with serrated disc blades (1204), which are fixed to the paddle sleeve (1202) by welding.

7. A premixing tank for carbon nanotube conductive slurry according to claim 5, characterized in that, The PTFE scraper assembly (11) is welded to the support rod component (1003) of the low-speed ribbon agitator via a support plate (1104), so that the front end of the PTFE scraper (1101) is tightly attached to the inner wall of the vessel body (2).

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