Vacuum stirring kettle
By employing inclined stirring blades, shearing blades, and scrapers in a vacuum mixing vessel, the adhesion and agglomeration problems of graphite anode materials during the drying process were solved, achieving uniform mixing and efficient production of materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-06
- Publication Date
- 2026-04-07
AI Technical Summary
Existing vacuum stirring kettles suffer from material adhesion and agglomeration problems during the drying process of graphite anode materials, which affect product quality and production efficiency.
A vacuum mixing vessel was designed, which uses inclined stirring blades, shearing blades and scrapers. By rotating counterclockwise or clockwise, the scraper removes the material from the inner wall to prevent adhesion and agglomeration.
It effectively prevents materials from adhering and clumping on the inner wall of the reactor, ensuring uniform mixing of materials and improving production efficiency and product quality.
Smart Images
Figure CN224086594U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of stirring device, concretely relates to a vacuum stirring kettle. BACKGROUND
[0002] With the rapid development of new energy technology, new energy batteries have become an indispensable key component in modern society and are widely used in electric vehicles, mobile communication devices, intelligent robots and other fields. As a core component of the battery system, the performance of the negative electrode material directly affects the overall capacity, efficiency and energy density of the battery. Among various negative electrode materials, graphite material has become the mainstream choice in the field of negative electrode materials due to its high capacity, excellent electrical conductivity and high energy density.
[0003] In the preparation process of graphite negative electrode material, it is usually necessary to modify its surface coating to improve its electrochemical performance and structural stability. Among them, liquid pitch coating is one of the common and effective modification processes. In this method, pitch is dissolved in an oily organic solvent (such as xylene, N-methyl pyrrolidone, etc.) to form a uniform solution, and then the uniform solution is mixed with graphite material and subjected to coating treatment. Since the organic solvent used is flammable and has a certain volatility under high temperature conditions, in order to ensure production safety and effectively remove the solvent, vacuum drying process is generally used. Vacuum drying can achieve rapid removal of solvent at low temperature, while avoiding material oxidation or thermal decomposition.
[0004] The existing vacuum drying equipment is usually a vacuum stirring kettle, which generally includes a sealed kettle body, a heating jacket, a stirring device and a vacuum system. The stirring device is driven by a motor to rotate the blades installed on the stirring shaft in the kettle, so that the materials are uniformly mixed during heating and evaporation of the solvent is promoted. However, it is found in actual production that as the solvent is continuously removed, the material gradually changes from a wet state to a dry state, and the dried graphite negative electrode material shows strong adhesion due to the presence of pitch and other binding components, which easily adheres to the surface of the stirring blades and the inner wall of the kettle body. With the passage of time, the adhered material gradually accumulates, agglomerates and hardens into lumps, which are difficult to completely disperse in subsequent processes, affecting the particle size distribution and consistency of the negative electrode material, and the lumpy material firmly adheres to the wall and the blade, which is time-consuming and laborious to clean and may damage the surface of the equipment.
[0005] Therefore, for the vacuum drying process of graphite negative electrode material and other easily adhered materials, the existing equipment has obvious deficiencies in anti-adhesion and anti-caking, which restricts the improvement of product quality and production efficiency. The industry urgently needs a new type of vacuum stirring kettle that can effectively prevent material adhesion and lumping during the drying process to adapt to the development trend of efficient and fine preparation of new energy materials.
[0006] This section is intended to provide background or context to the embodiments of the application. The description herein does not constitute admission that the prior art is prior art nor does it constitute an admission of any description in the section as prior art to the application. Utility model content
[0007] The utility model aims at providing a novel vacuum stirring kettle.
[0008] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:
[0009] The utility model provides a vacuum stirring kettle, including kettle body and the stirring mechanism of setting in the kettle body, the closed chamber for containing material is formed in the kettle body inside, the vacuum interface for making the closed chamber with outside vacuum system is provided on the kettle body, the stirring mechanism includes the rotating shaft extending along the vertical direction, the stirring blade, the shear blade and the scraper blade of installing on the rotating shaft and with the transmission connection of the rotating shaft drive component,
[0010] Among them, the stirring blade includes the upper stirring blade, the middle stirring blade and the lower stirring blade that are sequentially distributed along the vertical direction, in the vertical projection plane of the rotating shaft axis, the projection of the upper stirring blade, the middle stirring blade and the lower stirring blade respectively presents as first oblique line section, second oblique line section and third oblique line section, wherein, the first oblique line section and the second oblique line section have the same inclination trend, and all with the inclination trend of the third oblique line section is opposite,
[0011] The shear blade is located between the upper stirring blade and the lower stirring blade,
[0012] The scraper blade end of the scraper blade is adapted to the inner wall of the closed chamber, is used for scraping the inner wall in the stirring process,
[0013] The drive component is configured to selectively drive the rotating shaft to rotate clockwise or counterclockwise.
[0014] In some embodiments, the first oblique line section, the second oblique line section and the rotating shaft axis form an angle of 10°~60°, preferably 20°~50°, for example 20°, 25°, 30°, 35°, 40°, 45°, 50°.
[0015] In some embodiments, the third oblique line section and the rotating shaft axis form an angle of 95°~150°, preferably 100°~140°, for example 100°, 110°, 120°, 130°, 140°.
[0016] In some embodiments, the upper stirring blade, the middle stirring blade and the lower stirring blade each comprise a main body and an extension. The main body is fixedly connected to the rotating shaft. The extension has two ends, each of which is connected to the main body along the length direction of the main body. The upper end surface and the lower end surface of each extension are respectively protruded from the upper end surface and the lower end surface of the corresponding position of the main body.
[0017] In some specific embodiments, the extension has a connecting end surface opposite to the main body. The upper side region of the connecting end surface extends outwardly from bottom to top. The lower side region of the connecting end surface extends outwardly from top to bottom.
[0018] In some specific embodiments, the extension of the upper stirring blade, the middle stirring blade and the lower stirring blade is spaced apart from the inner wall of the sealed chamber in the plane in which the extension is located by 2-10 mm.
[0019] In some embodiments, the upper stirring blade, the middle stirring blade and the lower stirring blade are symmetrically distributed with the axis of the rotating shaft as the center line of symmetry.
[0020] In some embodiments, the projection of the upper stirring blade and the middle stirring blade on the horizontal plane overlaps, and the projection of the upper stirring blade and the middle stirring blade on the horizontal plane is staggered with the projection of the lower stirring blade on the horizontal plane.
[0021] In some embodiments, the scraper is arranged staggered with the upper stirring blade.
[0022] In some embodiments, the kettle body comprises an inverted conical kettle body and a kettle cover which is openably arranged on the kettle body. One end of the rotating shaft penetrates through the kettle cover and is drivingly connected to the driving assembly.
[0023] In some specific embodiments, the driving assembly comprises a driving motor, a first rotating wheel coaxially arranged on the upper end of the rotating shaft, a second rotating wheel coaxially connected to the output shaft of the driving motor, and a belt connected between the first rotating wheel and the second rotating wheel.
[0024] In some embodiments, the kettle body and / or the kettle cover is externally provided with a jacket. The jacket is provided with a medium inlet and a medium outlet.
[0025] In some embodiments, the rotating shaft is coaxially arranged with the kettle body.
[0026] In some embodiments, the bottom of the kettle body is provided with a discharge port. The discharge port is provided with a discharge valve.
[0027] In some embodiments, a support and a lifting mechanism arranged on the support are further included. The kettle body is connected to the lifting mechanism and is controlled to be lifted by the lifting mechanism.
[0028] In some embodiments, the outer side of the lower end of the kettle body is provided with a knocking hammer.
[0029] Compared with the prior art, the utility model has the following advantages due to the technical scheme:
[0030] The utility model discloses mainly through optimizing stirring mechanism, the arrangement stirring vane, shear blade and scraper on the rotating shaft, when the rotating shaft carries out counterclockwise or clockwise rotation, can drive each function component synchronous rotation.Specifically, the stirring vane of setting in the upper portion of rotating shaft adopts the inclination setting, is used for the down pressure material, the middle stirring vane also adopts the inclination setting, can further promote the mixing and dispersion of material, the bottom stirring vane adopts the design opposite to the inclination trend of upper stirring vane, effectively promotes the bottom material.Meanwhile, the shear blade of arranging on the rotating shaft carries out dynamic crushing to material in the rotating process, effectively breaks the material agglomeration trend, prevents the caking.In addition, the scraper can continuously scrape the material adhered to the kettle body inner wall along with the rotation, keeps the wall clean. BRIEF DESCRIPTION OF DRAWINGS
[0031] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor according to these drawings.
[0032] Figure 1 The structure schematic view of the vacuum stirring kettle provided for example 1 is shown in the figure.
[0033] Figure 2 The structure schematic view of the stirring mechanism provided for example 1 is shown in the figure.
[0034] Figure 3 The structure schematic view of the stirring mechanism provided for example 1 is shown in the figure.
[0035] Figure 4 The structure schematic view of the stirring mechanism provided for example 1 is shown in the figure.
[0036] Wherein, 1, kettle body;11, first medium inlet;12, first medium outlet;13, discharge valve;14, knocking hammer;
[0037] 2, kettle cover;21, second medium inlet;22, second medium outlet;23, vacuumizing interface;24, air inlet;25, air outlet;26, sight window;27, vacuum gauge interface;
[0038] 3, stirring mechanism; 31, rotating shaft; 32, upper stirring blade; 321, main body part; 322, extension part; 3221, upper connecting end face; 3222, lower connecting end face; 33, middle stirring blade; 34, lower stirring blade; 35, scraper; 36, shearing blade; 37, driving motor; 381, first rotating wheel; 382, second rotating wheel; 39, belt;
[0039] 4, support; 41, lifting rod; 42, control box;
[0040] a, first included angle; b, second included angle. DETAILED DESCRIPTION
[0041] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.
[0042] In the description of the embodiments of the present application, it is to be understood that the description herein of directions such as up, down, inner, outer, etc. are defined with reference to Figure 1 the directions as shown in the drawings. This is merely for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0043] In addition, the terms "first", "second", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0044] In the embodiments of the present application, unless otherwise specifically defined and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0045] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.
[0046] The present application will be further described below in conjunction with the embodiments shown in the drawings.
[0047] Embodiment 1: A vacuum stirred tank, as shown in Figure 1 The inside of the tank body forms a sealed chamber for containing materials, and the tank body is provided with a vacuum interface 23 for communicating the sealed chamber with an external vacuum system (not shown in the figure, which can refer to a conventional vacuum system in the art), so as to realize the vacuum operation of the sealed chamber, so as to effectively remove the gas and volatile components in the chamber during the stirring process. The stirring mechanism 3 includes a rotating shaft 31, stirring blades, shear blades 36, scrapers 35 and a driving assembly. Wherein: the rotating shaft 31 extends in the vertical direction. The stirring blades, shear blades 36 and scrapers 35 are respectively arranged on the rotating shaft 31; wherein the stirring blades include upper stirring blades 32, middle stirring blades 33 and lower stirring blades 34 distributed in the vertical direction in turn, and in the vertical projection plane of the axis of the rotating shaft 31 (the plane is not perpendicular to any central axis of the upper / middle / lower stirring blades), the projections of the upper stirring blades 32, the middle stirring blades 33 and the lower stirring blades 34 are respectively first, second and third inclined line segments, the first and second inclined line segments have the same inclination trend, and the third inclined line segment has the opposite inclination trend; the shear blades 36 are located between the upper stirring blades 32 and the lower stirring blades 34; the scraping edge end of the scraper 35 is matched with the inner wall of the sealed chamber, and is used for scraping the inner wall during the stirring process. The driving assembly is configured to selectively drive the rotating shaft 31 to rotate clockwise (forward rotation) or counterclockwise (reverse rotation).
[0048] When the rotating shaft 31 rotates under the drive of the drive assembly, it drives all functional components to rotate synchronously. The inclined arrangement of the stirring blades enhances the vertical flow of materials, preventing localized accumulation and uneven drying. Specifically, the inclined arrangement of the upper stirring blade 32 and the middle stirring blade 33 promotes mixing and dispersion of materials during rotation, while generating downward pressure to effectively control material floating. The bottom stirring blade adopts a design with the opposite inclination to lift materials, forming an internal circulating flow field that concentrates materials in the area between the upper stirring blade 32 and the lower stirring blade 34. Simultaneously, the shearing blade 36 arranged on the rotating shaft 31 works in conjunction with the stirring blades to dynamically break up the materials during rotation, effectively interrupting the tendency of material agglomeration and preventing clumping. The scraper 35 continuously scrapes away materials adhering to the inner wall of the vessel during rotation and guides them to the middle of the vessel, preventing wall adhesion and material accumulation. This structural design effectively solves the problems of material adhesion, clumping, and uneven drying in traditional vacuum drying equipment, and is particularly suitable for the vacuum drying process of highly adhesive materials such as graphite anode materials.
[0049] An excessively large or small tilt angle of the stirring blades may adversely affect the drying process. Preferably, the first angle α formed by the first and second inclined segments and the axis of rotation 31 is 10°~60°. The second angle b formed by the third inclined segment and the axis of rotation 31 is 95°~150°. By optimizing the tilt angle of the stirring blades, they can achieve downward pressing and upward lifting functions during rotation in different directions, forming a controllable and stable internal circulation.
[0050] In this embodiment, as Figure 2 As shown, the upper stirring blade 32, the middle stirring blade 33, and the lower stirring blade 34 all include a main body 321 and an extension 322. Taking the upper stirring blade 32 as an example, its main body 321 is fixedly connected to the rotating shaft 31; there are two extensions 322, which are respectively connected to both ends of the main body 321 along its length direction. The upper and lower end faces of each extension 322 protrude from the upper and lower end faces of the corresponding positions of the main body 321 to which it is connected. By providing the extensions 322, the overall working area of the stirring blade can be effectively increased, thereby improving the stirring range and shear strength of the material at the same rotation speed, and further improving the mixing efficiency and uniformity. Furthermore, the extension 322 has a connecting end face opposite to the main body 321. The upper region of this connecting end face (i.e., the upper connecting end face 3221) extends outward from bottom to top, and its lower region (i.e., the lower connecting end face 3222) extends outward from top to bottom. The extensions 322 of the upper stirring blade 32, the middle stirring blade 33 and the lower stirring blade 34 are spaced 2mm to 10mm apart from the inner wall of the sealed chamber in the plane they are located.
[0051] As preferred, the upper stirring blade 32, the middle stirring blade 33 and the lower stirring blade 34 are respectively symmetrically distributed with the rotation shaft 31 axis as the center line of symmetry. The symmetric layout enhances the dynamic balance of the rotation shaft 31 when rotating at high speed, and is more conducive to symmetrically and uniformly transmitting the stirring force to each area of the inner cavity of the kettle. Further, the projection of the upper stirring blade 32 and the middle stirring blade 33 on the horizontal plane overlaps, and the projection of the upper stirring blade 32 and the middle stirring blade 33 on the horizontal plane is staggered with the lower stirring blade 34. The projection of the upper stirring blade 32 and the middle stirring blade 33 overlaps, which is helpful to strengthen the axial conveying and overall circulation of the material; the projection of the lower stirring blade 34 is staggered, which can effectively break the symmetry of the bottom flow field, enhance the local turbulence and radial mixing strength, thereby significantly improve the mixing efficiency and uniformity in the whole kettle range, and effectively prevent the material from depositing at the bottom of the kettle. The "overlap" refers to that when vertically projecting along the axis of the stirring shaft, the entire projection profile of the upper stirring blade 32 and the middle stirring blade 33 shares the same center line, i.e., the projections of the two are centrally aligned in the axis direction.
[0052] In the embodiment, the shear blade 36 is located between the middle stirring blade 33 and the lower stirring blade 34, and the specific structure thereof can refer to the conventional structure in the art. The scraper 35 is arranged staggered with the upper stirring blade 32 and is adjacent to the upper stirring blade 32. The specific structure of the scraper 35 can refer to the conventional structure in the art, for example, a flexible material (such as polytetrafluoroethylene, fluororubber) or a rigid adjustable structure, which has a profile adapted to the shape of the inner wall of the kettle body and maintains a small gap (such as 1mm~5mm) or elastic fit. In order to further prevent wall sticking, the outer side of the lower end of the kettle body is installed with a knocking hammer 14, which can apply external mechanical vibration during stirring, effectively shaking off stubborn residual materials attached to the inner wall or the stirring mechanism 3. The specific structure of the knocking hammer 14 can refer to the conventional structure in the art, for example, a pneumatic, electromagnetic or mechanical driven hammer head, which periodically or conditionally knocks the kettle body according to the preset frequency and force.
[0053] The kettle body includes a kettle body 1 in the shape of an inverted cone and a kettle cover 2 which is openably arranged on the kettle body 1. The kettle body 1 is externally provided with a jacket, and the jacket is provided with a first medium inlet 11 for the circulation medium to enter and a first medium outlet 12 for the circulation medium to exit. The first medium inlet 11 and the first medium outlet 12 are connected to a circulation medium system (not shown in the figure, and the specific structure can be referred to the conventional structure in the art). The circulation medium includes but is not limited to circulating water. The bottom of the kettle body 1 is provided with a discharge port, and the discharge port is provided with a discharge valve 13. The discharge valve 13 is preferably a ball valve, and the specific structure can be referred to the manual half-ball valve in the patent CN118594348A or the similar conventional structure in the art. Similar to the kettle body 1, the kettle cover 2 is also externally provided with a jacket, and the jacket is provided with a second medium inlet 21 and a second medium outlet 22. The second medium inlet 21 and the second medium outlet 22 are also connected to the above-mentioned circulation medium system. A vacuum interface 23 is arranged on the kettle cover 2. In addition, the kettle cover 2 is also provided with an air inlet 24, an air outlet 25, a sight glass 26 and a vacuum gauge interface 27. The air inlet 24, the air outlet 25, the sight glass 26 and the vacuum gauge interface 27 can be referred to the conventional structure in the art, and will not be described here. One end of a rotating shaft 31 penetrates through the kettle cover 2 and is in transmission connection with a driving assembly, and is preferably coaxially arranged with the kettle body 1. The driving assembly includes a driving motor 37, a first rotating wheel 381 coaxially arranged on the upper end of the rotating shaft 31, a second rotating wheel 382 coaxially connected to the output shaft of the driving motor 37, and a belt 39 connected between the first rotating wheel 381 and the second rotating wheel 382.
[0054] In the embodiment, the vacuum stirring kettle further includes a support 4 and a lifting mechanism arranged on the support 4. The kettle body is connected to the lifting mechanism and is controlled to rise and fall by the lifting mechanism. The specific structure of the lifting mechanism can be referred to the conventional structure in the art. As an example, the lifting mechanism includes a lifting rod 41, a driving member and a control box 42. The lifting rod 41 is in transmission connection with the kettle body 1 and can move linearly in the vertical direction. The driving member provides power for the lifting rod 41, and can adopt an electric push rod, a hydraulic cylinder, a servo motor, etc. The control box 42 is used for setting and adjusting the lifting stroke, and can also be connected with the stirring mechanism 3 and other components to realize linkage control of stirring start and stop, stirring direction adjustment, vacuum air extraction and other processes.
[0055] In the production process of graphite negative electrode material, liquid pitch coating is an important link to improve its performance. Whether the pitch coating is complete has a huge impact on the performance of the final product. Combined with the above-mentioned new type of vacuum stirring kettle, high-quality pitch coating of graphite is realized. The following is the specific operation of liquid pitch coating and vacuum drying of graphite:
[0056] Before starting the experiment, first check the entire kettle body comprehensively, confirm that the equipment is in normal state, then vacuumize the kettle body, make the vacuum degree reach between-95 Kpa and-100 Kpa, and carry out pressure maintaining test. After the test is qualified, prepare to put in the material.
[0057] The pre-mixed graphite material and liquid pitch (pitch dissolved in organic solvent) are transferred into the kettle body. The circulating medium at a set temperature is introduced into the jacket, and the stirring is started, first in the low-speed reverse mode for drying. During this period, the change of the vacuum indicator is observed, and when only a small amount of liquid remains in the kettle, the stirring mode is switched to forward rotation until all the liquid is evaporated.
[0058] After all the liquid is evaporated, low-speed stirring is maintained, and the forward and reverse modes are alternately used, while the knocking hammer 14 is started to assist in wall removal. Through the observation window 26, it is observed that there is no block-shaped solid material attached to the inner wall of the kettle body, and then high-speed forward rotation stirring is turned on. As shown in the figure, at this time, the lower stirring blade 34 is in a downward posture, so that the material is repeatedly extruded at the bottom ball valve to achieve preliminary crushing. The material is dispersed upward during the extrusion process, and then crushed again by the middle shear blade 36. After a period of high-speed forward rotation, the high-speed reverse mode is switched: as shown in the figure, at this time, the lower stirring blade 34 lifts the material upward, and the upper stirring blade 32 presses the material downward, so that the material is mainly concentrated in the middle of the kettle body, and the middle shear blade 36 continues to crush the material. Figure 4 Figure 3
[0059] After the stirring reaches the predetermined time, the circulating medium temperature is adjusted to cool down the kettle body. After cooling down, the forward rotation stirring is started under the protection of nitrogen atmosphere (nitrogen can be introduced and discharged through the gas inlet 24 and the gas outlet 25 to realize the nitrogen atmosphere in the kettle body) to unload the material.
[0060] Finally, the material is sampled and detected, and the results show that the material as a whole has no caking and no adhesion to the kettle wall, and the particle size distribution meets the expected requirements.
[0061] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application should be covered within the protection scope of the present application.
Claims
1. A vacuum stirring vessel, comprising a vessel body and a stirring mechanism (3) disposed within the vessel body, wherein a sealed chamber for containing materials is formed inside the vessel body, and a vacuum port (23) is provided on the vessel body for connecting the sealed chamber to an external vacuum system, characterized in that: The stirring mechanism (3) includes a rotating shaft (31) extending in a vertical direction, stirring blades, shearing blades (36) and scrapers (35) mounted on the rotating shaft (31), and a drive assembly that is pulsatorically connected to the rotating shaft (31). The stirring blades include an upper stirring blade (32), a middle stirring blade (33), and a lower stirring blade (34) arranged sequentially along the vertical direction. In the vertical projection plane passing through the axis of the rotation shaft (31), the projections of the upper stirring blade (32), the middle stirring blade (33), and the lower stirring blade (34) are respectively presented as a first oblique line segment, a second oblique line segment, and a third oblique line segment; wherein the first oblique line segment and the second oblique line segment have the same inclination trend, and both have the opposite inclination trend to the third oblique line segment; The shearing blade (36) is located between the upper stirring blade (32) and the lower stirring blade (34); The scraper blade (35) is adapted to the inner wall of the sealed chamber and is used to scrape the inner wall during the stirring process. The drive assembly is configured to selectively drive the rotating shaft (31) to rotate clockwise or counterclockwise.
2. The vacuum stirred tank according to claim 1, characterized in that: The angles between the first oblique line segment, the second oblique line segment, and the axis of the rotation shaft (31) are 10°~60°; and / or, The angle between the third oblique line segment and the axis of the rotation shaft (31) is 95°~150°.
3. The vacuum stirred tank according to claim 1, characterized in that: The upper stirring blade (32), the middle stirring blade (33) and the lower stirring blade (34) each include a main body (321) and an extension (322). The main body (321) is fixedly connected to the rotating shaft (31); The extension (322) has two parts and is respectively connected to both ends of the main body (321) along its length direction. The upper end face and lower end face of each extension (322) protrude from the upper end face and lower end face of the corresponding position of the main body (321) to which it is connected.
4. The vacuum stirred tank according to claim 3, characterized in that: The extension (322) has a connecting end face opposite to the main body (321), the upper region of which extends outward from bottom to top, and the lower region extends outward from top to bottom; and / or, The extensions (322) of the upper stirring blade (32), the middle stirring blade (33) and the lower stirring blade (34) are spaced 2mm to 10mm apart from the inner wall of the sealed chamber in the plane they are located on.
5. The vacuum stirred tank according to claim 1, characterized in that: The upper stirring blade (32), the middle stirring blade (33), and the lower stirring blade (34) are symmetrically distributed with respect to the axis of rotation (31) as the center line; and / or, The projections of the upper stirring blade (32) and the middle stirring blade (33) on the horizontal plane overlap, and the projections of the lower stirring blade (34) on the horizontal plane intersect.
6. The vacuum stirred tank according to claim 1, characterized in that: The scraper (35) and the upper stirring blade (32) are arranged alternately.
7. The vacuum stirred tank according to any one of claims 1 to 6, characterized in that: The vessel body includes an inverted conical vessel body (1) and a vessel lid (2) that can be opened and closed on the vessel body (1). One end of the rotating shaft (31) passes through the vessel lid (2) and is connected to the drive assembly for transmission.
8. The vacuum stirred tank according to claim 7, characterized in that: The drive assembly includes a drive motor (37), a first wheel (381) coaxially disposed on the upper end of the rotating shaft (31), a second wheel (382) connected to the output shaft of the drive motor (37) and coaxial with the second wheel (382), and a belt (39) tensioned between the first wheel (381) and the second wheel (382).
9. The vacuum stirred tank according to claim 7, characterized in that: The vessel body (1) and / or the vessel cover (2) are provided with a jacket, and the jacket is provided with a medium inlet and a medium outlet.
10. The vacuum stirred tank according to claim 7, characterized in that: The rotating shaft (31) is coaxially arranged with the vessel body (1).
11. The vacuum stirred tank according to claim 7, characterized in that: The bottom of the vessel body (1) is provided with a discharge port, and the discharge port is provided with a discharge valve (13).
12. The vacuum stirred tank according to claim 1, characterized in that: It also includes a support (4) and a lifting mechanism provided on the support (4), the vessel body is connected to the lifting mechanism and the lifting is controlled by the lifting mechanism.
13. The vacuum stirred tank according to claim 1, characterized in that: A hammer (14) is installed on the outer side of the lower end of the vessel body.