CN109173890B - Kneading device for preparing boron-containing graphite material - Google Patents
Kneading device for preparing boron-containing graphite material Download PDFInfo
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- CN109173890B CN109173890B CN201811092628.3A CN201811092628A CN109173890B CN 109173890 B CN109173890 B CN 109173890B CN 201811092628 A CN201811092628 A CN 201811092628A CN 109173890 B CN109173890 B CN 109173890B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/834—Mixing in several steps, e.g. successive steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a kneading device for preparing a boron-containing graphite material, which comprises an outer stirring tank, an inner stirring tank, a stirring mechanism, a transmission mechanism, a feeding mechanism and a powder dispersing mechanism, wherein the inner stirring tank is arranged in the outer stirring tank, the stirring mechanism is arranged at the top of the outer stirring tank, and the stirring mechanism drives the inner stirring tank to rotate reversely through the transmission mechanism.
Description
Technical Field
The invention relates to the technical field of preparation of boron-containing graphite materials, in particular to a mixing and kneading device for preparing the boron-containing graphite materials.
Background
In the chinese patent of CN200410093183.2, "China developed and produced nuclear graphite since the last 60 th century". The boron-containing graphite for the nuclear graphite is developed and produced according to the standard requirements of CEFR 01307 ZHC01-JT (China experiment fast reactor fluid System and related parts cleaning technical conditions), GB7427-78 (carbon material sampling method, GB1429-85 (graphite material ash content determination method) and the like. The improvement of the production technology ensures that the boron content index of the boron-containing graphite reaches the standard requirement and is uniformly distributed through the complex production process. The boron content index detection meets the standard requirement according to the detection of a plasma emission spectrometry.
The boron-containing graphite used in the nuclear reactor plays a role in absorbing neutrons generated by nuclear reaction in the nuclear reaction process, and the boron content and uniformity of the boron-containing graphite are key to play the role. The boron-containing graphite has strict requirements on the boron content except the technical index requirements of graphite materials such as the volume density, the mechanical strength, the ash content, the thermal expansion coefficient, the heat conductivity coefficient and the like of general nuclear graphite, and is expressed as the quality control requirement of uniformity inside a product.
In the Chinese patent with the patent number of CN200410093183.2, a boron-containing graphite and a preparation method thereof are disclosed, wherein graphitized coke is used as a raw material, boron carbide is added into the raw material in batches for dry mixing, medium-temperature asphalt is added into the raw material for wet mixing, and the boron-containing graphite which contains more than or equal to 4 percent of boron and is uniformly distributed is obtained through multiple processes of profiling, roasting, dipping, graphitization and the like, and the analysis test is met with the standard.
However, the above patent does not solve the technical problem that the boron source is uniformly added in the preparation process of the boron-containing graphite, and the boron source is uniformly mixed with the raw materials for producing the graphite.
Disclosure of Invention
Aiming at the problems, the invention provides a kneading device for preparing a boron-containing graphite material, which is characterized in that a boron source is added in a plurality of times, and graphite raw materials added with the boron source are stirred in the adding process, so that the boron source is uniformly distributed in the raw materials, the technical problem of uneven boron distribution of the produced boron-containing graphite caused by uneven boron source distribution in the production and preparation process of the boron-containing graphite is solved, the uniformity of boron distribution of the boron-containing graphite is improved, and the quality of the boron-containing graphite is improved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a kneading apparatus for the preparation of boron-containing graphite material, comprising:
the outer stirring tank is vertically arranged through the frame, the bottom of the outer stirring tank is conical, and a discharge opening is formed in the bottom of the outer stirring tank;
the inner stirring tank is coaxially and rotatably arranged in the outer stirring tank, is positioned at the top of the outer stirring tank, is hollow, is internally provided with a plurality of flow passages which are equidistantly arranged along the circumference of the central axis of the inner stirring tank, is obliquely arranged, is communicated with the stirring area of the inner stirring tank, and is communicated with the inside of the outer stirring tank;
the stirring mechanism is arranged at the top of the outer stirring tank and comprises a driving piece and a stirring shaft which is driven by the driving piece to penetrate through the inner stirring tank and is arranged on the inner stirring tank, a first stirring paddle which is synchronously rotated with the stirring shaft and a second stirring paddle which is synchronously rotated with the stirring shaft are arranged in the outer stirring tank, a feeding channel is arranged in the stirring shaft in a hollow mode, the top opening of the stirring mechanism is rotatably connected with a first feeding pipe for inputting boron source powder, a plurality of circumferentially arranged first discharging holes, a plurality of circumferentially arranged second discharging holes and a plurality of circumferentially arranged third discharging holes are respectively arranged on the side wall of the stirring shaft along the axis direction of the stirring mechanism from top to bottom and are communicated with the feeding channel, the first discharging holes are arranged above the inner stirring tank, the second discharging holes are arranged in the inner stirring tank and are positioned above the first stirring paddle, and the third discharging holes are arranged in the outer stirring tank and are positioned above the second stirring paddle;
the transmission mechanism is arranged between the stirring shaft and the inner stirring tank and is positioned at the top of the inner stirring tank, and the stirring shaft synchronously drives the inner stirring tank to reversely rotate through the transmission mechanism;
the feeding mechanism is arranged at the top of the inner stirring tank and comprises a second feeding pipe for inputting coke aggregate, a third feeding pipe for inputting binder and a spraying component arranged at the discharge holes of the second feeding pipe and the third feeding pipe; and
the powder scattering mechanism is arranged at the first discharging hole and comprises a centrifugal impeller which synchronously rotates along with the stirring shaft, boron source powder output at the first discharging hole is centrifugally thrown out and sprayed onto a mixture output by the discharging hole.
As an improvement, the inner stirring tank is in an inverted truncated cone shape, and the rotation direction of the inner stirring tank is opposite to the inclination direction of the flow channel and the rotation direction of the first stirring paddle.
As an improvement, the first stirring paddle is in a spiral shape, the first stirring paddle is matched with the inner shape of the stirring tank, stirring spoons are arranged between the spiral paddles of the first stirring paddle at equal intervals, and the stirring spoons are in sharp angle arrangement.
As an improvement, the sharp angle of the stirring scoop is upwards arranged along the spiral direction of the first stirring paddle.
As an improvement, the second stirring paddles are arranged in an impeller shape, and the shapes of the stirring paddles arranged at equal intervals along the circumference of the central axis of the second stirring paddles are matched with the conical bottom of the outer stirring tank.
As an improvement, the transmission mechanism comprises:
the sun gear is coaxially and rotatably connected with the stirring shaft;
the planetary gears are arranged at equal intervals along the circumference of the central axis of the sun gear, meshed with the sun gear and connected with the rack in a hanging manner; and
the inner gear ring is coaxially connected with the inner stirring tank and meshed with the planet gears.
As an improvement, the spray assembly comprises:
the sealing cover is hinged with the second feeding pipe and the third feeding pipe respectively, and the opening directions of the sealing cover and the second feeding pipe and the third feeding pipe are all towards the stirring shaft; and
the intermittent swing assembly is arranged at the sealing cover and drives the sealing cover to swing around the position hinged with the discharge port of the second feeding pipe and the discharge port of the third feeding pipe through rotation of the stirring shaft.
As an improvement, the intermittent swing assembly includes:
the guide wheel is sleeved on the stirring shaft, a plurality of guide grooves are formed in the lower end face of the guide wheel, and the guide grooves are equidistantly arranged along the circumference of the central axis of the guide wheel; and
the middle part of the lever is connected with the bottom of the powder scattering mechanism through a cantilever, one end of the lever is in abutting arrangement with the guide wheel, and the other end of the lever is in transmission connection with the sealing cover through a connecting rod.
As an improvement, the top of the inner stirring tank is provided with a check ring, and the check ring is positioned at the inner side of the discharge hole.
As an improvement, the powder dispersing mechanism further comprises:
the powder scattering cavity is covered outside the centrifugal impeller and is coaxially matched with the check ring, and a powder scattering hole is formed in the position, right above the discharge hole, of the powder scattering cavity; and
the scraping sheets are arranged in a one-to-one correspondence with the powder scattering holes, and are symmetrically arranged on two sides of the powder scattering cavity.
The invention has the beneficial effects that:
(1) According to the invention, the first discharge hole, the second discharge hole and the third discharge hole which are sequentially arranged on the stirring shaft are used for realizing the uniform addition of the boron source for multiple times in the mixing process of the boron-containing graphite raw material, so that the boron source is distributed more uniformly in the boron-containing graphite raw material, and the boron-containing graphite with good boron distribution uniformity is prepared;
(2) According to the invention, when the coke aggregate and the adhesive enter the inner stirring tank through the second feeding pipe and the third feeding pipe respectively, the two ends of the lever are driven to swing up and down to drive the sealing cover to open and close by utilizing the rotation of the guide wheels, so that the coke aggregate and the adhesive are sprayed to the stirring shaft, and the coke aggregate and the adhesive are matched with the boron source output by the second discharging hole to realize centralized mixing at the stirring shaft and realize full mixing in the process of sliding along with the propeller blade;
(3) According to the invention, the stirring ladle in the first stirring paddle is used for stirring the raw material containing boron graphite, in the stirring process, the sharp angle of the stirring ladle faces the raw material, the raw material is stirred at the concave position of the back side of the sharp angle after passing over the sharp angle, so that uniform mixing is realized, and the raw material at the bottom of the inner stirring tank is extruded by the screw blade in the first stirring paddle in the rotating process, so that the raw material is pressed into the flow channel and sprayed out at the discharge port;
(4) According to the invention, the first stirring paddle rotates through the transmission mechanism, and the inner stirring tank synchronously rotates reversely, so that the pressure of raw materials in the runner is increased, and the raw materials in the runner are smoother;
(5) According to the invention, the raw materials are uniformly sprayed out of the discharge hole by utilizing the rotation of the runner, and the boron source output by the second discharge hole is uniformly dispersed and mixed with the sprayed raw materials for the second time by matching with the powder dispersing mechanism, so that the uniformity of the distribution of the boron source in the raw materials is improved;
(6) According to the invention, the boron source output from the third discharge hole is dispersed by the second stirring paddle, and the raw materials containing boron graphite are mixed for three times, so that the boron sources are respectively and uniformly distributed when falling onto the raw materials in the external stirring tank, and then the boron sources are uniformly distributed by stirring of the second stirring paddle.
In conclusion, the method has the advantages of good boron distribution uniformity, uniform mixing and the like, and is particularly suitable for the technical field of boron-containing graphite production and preparation.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of a cross-sectional structure of the present invention;
FIG. 3 is a schematic view of the structure of the inner stirring tank of the invention;
FIG. 4 is a schematic perspective view of an inner agitator tank of the present invention;
FIG. 5 is a schematic perspective view of a transmission mechanism of the present invention;
FIG. 6 is an enlarged schematic view of the structure shown in FIG. 5A;
FIG. 7 is a schematic cross-sectional view of the powder dispersing mechanism of the present invention;
FIG. 8 is an enlarged schematic view of the structure shown at B in FIG. 7;
FIG. 9 is a schematic cross-sectional view of the feed mechanism of the present invention;
FIG. 10 is a schematic diagram of the operation of the spray assembly of the present invention;
FIG. 11 is a schematic illustration of the connection of the guide wheel to the lever of the present invention;
FIG. 12 is a schematic view of a first paddle structure of the present invention;
FIG. 13 is a schematic diagram of the operation of the stirring scoop of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Examples:
as shown in fig. 1 to 6, a kneading apparatus for preparing a boron-containing graphite material, comprising:
the outer stirring tank 1 is vertically arranged through a frame 10, the bottom of the outer stirring tank 1 is in a conical shape, and a discharge opening 11 is formed in the bottom of the outer stirring tank 1;
the inner stirring tank 2 is coaxially and rotatably arranged in the outer stirring tank 1, the inner stirring tank 2 is positioned at the top of the outer stirring tank 1, the side wall 21 of the inner stirring tank 2 is hollow, a plurality of flow channels 22 which are equidistantly arranged along the circumference of the central axis of the inner stirring tank 2 are arranged in the side wall 21, the flow channels 22 are obliquely arranged, a feeding hole 221 at the bottom of the flow channels is communicated with a stirring area 23 of the inner stirring tank 2, and a discharging hole 222 at the top of the flow channels is communicated with the inside of the outer stirring tank 1;
the stirring mechanism 3 is arranged at the top of the outer stirring tank 1, and comprises a driving piece 30 and a stirring shaft 31 which is driven by the driving piece 30 to penetrate through the inner stirring tank 2 and is rotationally arranged, a first stirring paddle 32 which is arranged in the inner stirring tank 2 and synchronously rotates with the stirring shaft 31, and a second stirring paddle 33 which is arranged in the outer stirring tank 1 and synchronously rotates with the stirring shaft 31, a feeding channel 34 is arranged in the stirring shaft 31 in a hollow manner, a first feeding pipe 35 of which the top opening is rotatably connected with a boron source powder is arranged, a plurality of circumferentially arranged first discharging holes 311, a second discharging holes 312 and a third discharging holes 313 are respectively arranged on the side wall of the stirring shaft 31 from top to bottom along the axis direction of the stirring shaft, and are communicated with the feeding channel 34, the first discharging holes 311 are arranged above the inner stirring tank 2, the second discharging holes 312 are arranged in the inner stirring tank 2 and are positioned above the first stirring paddle 32, the third discharging holes 313 are arranged in the outer stirring tank 1 and are positioned above the second stirring paddle 33;
the transmission mechanism 4 is arranged between the stirring shaft 31 and the inner stirring tank 2 and is positioned at the top of the inner stirring tank 2, and the stirring shaft 31 synchronously drives the inner stirring tank 2 to reversely rotate through the transmission mechanism 4;
the feeding mechanism 5 is arranged at the top of the inner stirring tank 2, and comprises a second feeding pipe 51 for feeding coke aggregate, a third feeding pipe 52 for feeding binder, and a spraying component 53 arranged at the discharge ports of the second feeding pipe 51 and the third feeding pipe 52; and
the powder scattering mechanism 6 is arranged at the first discharging hole 311, and comprises a centrifugal impeller 61, the centrifugal impeller 61 synchronously rotates along with the stirring shaft 31, and the boron source powder output at the first discharging hole 311 is centrifugally thrown out and sprayed onto the mixture output by the discharging hole 222.
In the present invention, in order to uniformly distribute the boron source in the mixture of the coke aggregate and the binder after the boron source is added, the boron source is added to the mixture of the coke aggregate and the binder three times, wherein the first addition is performed in a process of feeding the coke aggregate and the binder into the inner stirring tank 2 through the second feeding pipe 51 and the third feeding pipe 52, the second feeding pipe 51 and the third feeding pipe 52 respectively input the coke aggregate and the binder into the inner stirring tank 2, and simultaneously, the first feeding pipe 35 synchronously inputs the boron source into the inner stirring tank 2 through the second feeding hole 312, and the input coke aggregate, binder and boron source are uniformly mixed by the first stirring paddle 32.
The second boron source is added by the boron source output by the first discharging hole 311 when the raw materials in the inner stirring tank 2 are stirred by the first stirring paddle 32 and then enter the inner stirring tank 1 from the feeding hole 221 and flow into the inner stirring tank 22, and are sprayed out from the top discharging hole 222 of the flow channel 22, in the adding process, the boron source output by the first discharging hole 311 is uniformly dispersed from the center to the outside by the centrifugal impeller 61, and the raw materials are sprayed out from the discharging hole 222 and sprayed into the outer stirring tank 1, so that the boron source is uniformly distributed when the boron source is sprayed onto the raw materials.
The third boron source adding is that when the raw material falls into the bottom of the outer stirring tank after the raw material is added by the second boron source, the boron source output by the third discharging hole 313 adds the raw material, the boron source output by the third discharging hole 313 is uniformly dispersed into the outer stirring tank 1 by the stirring of the second stirring paddle 33, and then scattered onto the raw material in the outer stirring tank 1, and the raw material and the boron source are stirred by the second stirring paddle 33, so that the boron source is uniformly distributed.
The boron source in the invention can be boron carbonate or boric acid powder, and the boron source enters the feeding channel 34 inside the stirring shaft 31 through the first feeding pipe 35 and is output through the first outlet hole 311, the second discharging hole 332 and the third discharging hole 333.
In the invention, an inner stirring tank 2 is erected at the top of an outer stirring tank 1 through a bracket, and a thrust bearing is arranged at the bottom of the inner stirring tank 2.
As shown in fig. 3 and 5, as a preferred embodiment, the inner stirring tank 2 has an inverted truncated cone shape, and the rotation direction thereof is opposite to the inclination direction of the flow passage 22 and the rotation direction of the first stirring paddle 32.
Further, the transmission mechanism 4 includes:
a sun gear 41, wherein the sun gear 41 is coaxially and rotatably connected with the stirring shaft 31;
the planetary gears 42, several planetary gears 42 are equidistantly arranged along the circumference of the central axis of the sun gear 41, engaged with the sun gear 41, and suspended from the frame 10; and
the inner gear ring 43 is coaxially connected with the inner gear ring 43, and is arranged in the inner stirring tank 2 in a meshed manner with the planet gears 42.
In the present invention, the sun gear 41 is driven to rotate by the rotation of the stirring shaft 31, the inner stirring tank 2 and the stirring shaft 31 are rotated in the opposite direction by the planetary gear set formed by the sun gear 41, the planetary gears 42 and the inner gear ring 43, and the inner stirring tank 2 is rotated in accordance with the inclined arrangement of the flow passage 22, so that the raw material containing boron graphite can smoothly flow in the flow passage and be sprayed at the discharge port 222.
As shown in fig. 12 to 13, as a preferred embodiment, the first stirring paddle 32 is provided in a spiral shape, which is matched with the internal shape of the inner stirring tank 2, stirring scoops 322 are provided between the spiral blades 321 of the first stirring paddle 32 at equal intervals in a spiral manner, the stirring scoops 322 are provided in a sharp angle, and the sharp angle of the stirring scoops 322 is provided upwards along the spiral direction of the first stirring paddle 32.
In the present invention, the first stirring paddle 32 is spirally disposed to extrude the raw material at the bottom of the inner stirring tank 2 by the rotation of the propeller blade 321, so that the raw material enters the flow passage 22 through the feed port 221, and the propeller blade 321 extrudes the subsequent raw material, so that the raw material in the flow passage 22 can be ejected from the discharge port 222.
Further, the stirring spoon 322 is positioned between the propeller blades 321, the stirring spoon 322 is used for stirring raw materials, so that the raw materials are split to two sides when contacting with the sharp corners of the stirring spoon 322, and the raw materials are converged and stirred at the concave part at the rear part of the stirring spoon 322 after passing over the stirring spoon 322, so that boron sources in the raw materials are uniformly distributed.
As shown in fig. 9 to 11, as a preferred embodiment, the spray assembly 53 includes:
the sealing cover 531 is hinged with the discharge ports of the second feeding pipe 51 and the third feeding pipe 52 respectively, and the opening directions of the sealing cover 531 and the discharge ports of the second feeding pipe 51 and the third feeding pipe 52 are all arranged towards the stirring shaft 31; and
the intermittent swing assembly 530 is disposed at the cover 531, and drives the cover 531 to swing around the position hinged to the discharge port of the second feeding pipe 51 and the third feeding pipe 52 by rotating the stirring shaft 31.
Further, the intermittent swing assembly 530 includes:
the guide wheel 532 is sleeved on the stirring shaft 31, the lower end surface of the guide wheel 532 is provided with a plurality of guide grooves, and the guide grooves are equidistantly arranged along the circumference of the central axis of the guide wheel 532; and
the middle part of the lever 534 is connected with the bottom of the powder dispersing mechanism 6 through a cantilever 535, one end of the lever 534 is in abutting arrangement with the guide wheel 532, and the other end of the lever 534 is in transmission connection with the sealing cover 531 through a connecting rod.
In the present invention, when the second feeding pipe 51 and the third feeding pipe 52 are used for feeding the coke aggregates and the binder into the inner stirring tank 2, in order to make the coke aggregates and the binder converged and concentrated at the stirring shaft 31, the lever 534 is matched with the guiding groove by using the guiding wheel 532 to realize the swinging of the lever 534, the sealing cover 531 is driven to swing by the connecting rod, the opening sizes of the discharge holes of the second feeding pipe 51 and the third feeding pipe 52 are controlled, and the discharging direction is guided by the sealing cover 531, so that the coke aggregates and the binder spray box stirring shaft 31 are positioned.
Further, the guide wheel 532 is driven by the stirring shaft 31 to rotate, the guide grooves formed in the guide wheel 532 are all in smooth transition, and a ball portion is formed at one end of the lever 534, which is matched with the guide wheel 532.
As shown in fig. 7 to 8, as a preferred embodiment, the top of the inner stirring tank 2 is provided with a retainer ring 24, and the retainer ring 24 is located inside the discharge port 222.
Wherein, the powder dispersing mechanism 6 further comprises:
the powder dispersing cavity 62 is covered outside the centrifugal impeller 61, the powder dispersing cavity 62 and the retainer ring 24 are coaxially matched, and a powder dispersing hole 621 is arranged at the position of the powder dispersing cavity 62 right above the discharge hole 222; and
the scraping sheets 63 are arranged in a one-to-one correspondence with the powder scattering holes 621, and the scraping sheets 63 are symmetrically arranged at two sides of the powder scattering cavity 62.
In the present invention, when the centrifugal impeller 61 disperses the boron source output from the first discharge hole 311, the boron source disperses in the powder dispersing cavity 62, and the boron source is sprayed on the raw material through the powder dispersing hole 621, and in order to prevent the raw material from flowing backward, the powder dispersing cavity 62 is matched with the retainer ring 24, so that the raw material sprayed from the discharge hole 222 cannot enter the powder dispersing cavity 62, and the raw material sprayed from the discharge hole 222 is scraped rapidly by the scraper 63, so that the raw material is prevented from accumulating at the discharge hole 222.
As shown in fig. 2, as a preferred embodiment, the second stirring paddle 33 is provided in the shape of an impeller, and the shape of stirring paddles provided at equal intervals along the circumference of the center axis thereof is matched with the tapered bottom of the outer stirring tank 1.
In the present invention, the bottom of the external stirring tank 1 is stirred by the second stirring blade 33, so that the raw material can be smoothly discharged when discharged from the external stirring tank 1.
The working process comprises the following steps:
the method comprises the following steps:
i) primary mixing, namely respectively inputting a boron source, coke aggregate and a binder into the inner stirring tank 2 through a second discharging hole 312, a second feeding pipe 51 and a third feeding pipe 52 on the first feeding pipe 35;
II) stirring once, namely driving the mixture of the boron source, the coke aggregate and the binder input in the step I) to drive the first stirring paddle 32 to mix through the driving piece 30, and uniformly stirring, wherein the inner stirring tank 2 is synchronously driven by the driving piece 30 to rotate reversely with the first stirring paddle 32 through the transmission mechanism 4;
III) spraying, namely, the screw blade 321 of the rotating first stirring paddle 32 is matched with the rotation and pressurization of the inner stirring tank 2, so that the mixture stirred in the step II) enters the flow channel 22 from the feed inlet 221 at the bottom of the inner stirring tank 2 and is sprayed out from the discharge outlet 222;
IV) secondary mixing, namely driving the centrifugal impeller 61 to rotate through the driving piece 30, uniformly dispersing the boron source output from the first discharge hole 311 in the powder dispersing cavity 62, and then mixing the boron source with the mixture sprayed in the step III) through the powder dispersing hole 621, wherein the mixed mixture falls into the outer stirring tank 1;
v) secondary stirring, namely driving the second stirring paddle 33 to rotate through the driving piece 30 to uniformly stir the mixture falling into the outer stirring tank (1) in the step IV);
VI) three times of mixing, and synchronously with the step V), the second stirring paddle 33 rotates to uniformly disperse the boron source output from the third discharge hole 313 and then uniformly stir the boron source and the mixture which is dropped into the outer stirring tank 1 in the step IV);
VII) kneading, wherein the mixture obtained in the step VI) is stirred by a second stirring paddle 33 and is output into a kneading pot from a discharge port 11, and the kneading pot is used for kneading.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. A kneading device for preparing a boron-containing graphite material, comprising:
the outer stirring tank (1) is vertically arranged through a frame (10), the bottom of the outer stirring tank (1) is in conical arrangement, and a discharge opening (11) is formed in the bottom of the outer stirring tank;
the inner stirring tank (2), the inner stirring tank (2) is coaxially arranged in the outer stirring tank (1) in a rotating way, the inner stirring tank is positioned at the top of the outer stirring tank (1), the side wall (21) of the inner stirring tank is hollow, a plurality of flow channels (22) which are arranged along the circumference of the central axis of the inner stirring tank (2) at equal intervals are arranged in the side wall (21), the flow channels (22) are obliquely arranged, the feed inlet (221) at the bottom of the flow channels are communicated with the stirring area (23) of the inner stirring tank (2), and the discharge outlet (222) at the top of the flow channels are communicated with the inside of the outer stirring tank (1);
the stirring mechanism (3), stirring mechanism (3) set up in the top of outer agitator tank (1), it includes driving piece (30) and runs through (31) of interior agitator tank (2) rotation setting by driving piece (30) drive, set up in first (32) and setting up in the interior agitator tank (2) with (31) synchronous pivoted stirring rake and in the interior (33) of outer agitator tank (1) with (31) synchronous pivoted stirring rake, (31) inside cavity is provided with feed channel (34), its open top and the first inlet pipe (35) rotatable coupling setting of input boron source powder, and be provided with a plurality of circumference first discharge port (311), second discharge port (312) and third discharge port (313) that set up respectively from top to bottom on the lateral wall of this (31) along wherein in the axis direction of rotation, first discharge port (311) set up in the top of interior agitator tank (2) with (31) synchronous pivoted stirring rake (33), second (312) set up in the top of interior agitator tank (2) in the top of stirring rake (313) are located in the top of the interior (2) of stirring rake (3) in the top of stirring rake (3), the rotation direction of the stirring device is opposite to the inclination direction of the flow channel (22) and the rotation direction of the first stirring paddle (32);
the transmission mechanism (4), the transmission mechanism (4) is arranged between the stirring shaft (31) and the inner stirring tank (2) and is positioned at the top of the inner stirring tank (2), and the stirring shaft (31) synchronously drives the inner stirring tank (2) to reversely rotate through the transmission mechanism (4);
the feeding mechanism (5) is arranged at the top of the inner stirring tank (2), and comprises a second feeding pipe (51) for inputting coke aggregate, a third feeding pipe (52) for inputting binder, and a spraying component (53) arranged at the discharge ports of the second feeding pipe (51) and the third feeding pipe (52); and
the powder scattering mechanism (6) is arranged at the first discharging hole (311) and comprises a centrifugal impeller (61), the centrifugal impeller (61) synchronously rotates along with the stirring shaft (31), boron source powder output at the first discharging hole (311) is centrifugally thrown out and sprayed onto a mixture output by the discharging hole (222);
the first stirring paddles (32) are arranged in a spiral shape and are matched with the inner shape of the inner stirring tank (2), stirring scoops (322) are arranged between the spiral paddles (321) of the first stirring paddles (32) in a spiral equidistant mode, and the stirring scoops (322) are arranged in a sharp angle mode;
the sharp angle of the stirring scoop (322) is upwards arranged along the spiral direction of the first stirring paddle (32).
2. A kneading device for the preparation of boron-containing graphite material according to claim 1, characterized in that the second stirring paddle (33) is provided in the shape of an impeller, the profile of the stirring paddles provided equidistantly along the circumference of the central axis thereof being provided in matching relation to the conical bottom of the outer stirring tank (1).
3. Kneading device for the preparation of boron-containing graphite material according to claim 1, characterized in that the transmission mechanism (4) comprises:
a sun gear (41), wherein the sun gear (41) is coaxially and rotatably connected with the stirring shaft (31);
the planetary gears (42), a plurality of planetary gears (42) are equidistantly arranged along the circumference of the central axis of the sun gear (41), are meshed with the sun gear (41), and are in suspension connection with the frame (10); and
the inner gear ring (43) is coaxially connected with the inner gear ring (43) and arranged in the inner stirring tank (2), and the inner stirring tank is meshed with the planet gears (42).
4. A kneading device for the preparation of boron-containing graphite material according to claim 1, wherein the spray assembly (53) comprises:
the sealing cover (531), the sealing cover (531) is hinged with the discharge holes of the second feeding pipe (51) and the third feeding pipe (52) respectively, and the opening directions of the sealing cover (531) and the discharge holes of the second feeding pipe (51) and the third feeding pipe (52) are all towards the stirring shaft (31); and
the intermittent swing assembly (530) is arranged at the sealing cover (531), and the intermittent swing assembly (530) rotationally drives the sealing cover (531) to swing around a position hinged with the discharge port of the second feeding pipe (51) and the discharge port of the third feeding pipe (52) through the stirring shaft (31).
5. A kneading device for the preparation of boron-containing graphite material according to claim 4, wherein the intermittent oscillating assembly (530) comprises:
the guide wheel (532) is sleeved on the stirring shaft (31), a plurality of guide grooves are formed in the lower end face of the guide wheel (532), and the guide grooves are equidistantly arranged along the circumference of the central axis of the guide wheel (532); and
the middle part of the lever (534) is connected with the bottom of the powder dispersing mechanism (6) through a cantilever (535), one end of the lever (534) is in abutting arrangement with the guide wheel (532), and the other end of the lever (534) is in transmission connection with the sealing cover (531) through a connecting rod.
6. Kneading device for the preparation of boron-containing graphite material according to claim 1, characterized in that the top of the inner stirring tank (2) is provided with a collar (24), which collar (24) is located inside the discharge opening (222).
7. A kneading device for the preparation of boron-containing graphite material according to claim 6, wherein the powder dispersing mechanism (6) further comprises:
the powder scattering cavity (62), the powder scattering cavity (62) is covered outside the centrifugal impeller (61), the powder scattering cavity (62) and the retainer ring (24) are coaxially matched, and a powder scattering hole (621) is formed in the position, right above the discharge hole (222), of the powder scattering cavity (62); and
scraping sheets (63), wherein a plurality of scraping sheets (63) are arranged in one-to-one correspondence with the powder scattering holes (621), and the scraping sheets (63) are symmetrically arranged on two sides of the powder scattering cavity (62).
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| CN201811092628.3A CN109173890B (en) | 2018-09-19 | 2018-09-19 | Kneading device for preparing boron-containing graphite material |
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| CN201811092628.3A CN109173890B (en) | 2018-09-19 | 2018-09-19 | Kneading device for preparing boron-containing graphite material |
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| CN110433681A (en) * | 2019-07-19 | 2019-11-12 | 中国纺织科学研究院有限公司 | Solid-liquid mixer |
| CN112408985B (en) * | 2020-10-22 | 2022-09-13 | 中钢新型材料股份有限公司 | Preparation method of high-performance fine isostatic pressing graphite |
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