CN113398811A - Coating equipment and coating method for silicon-carbon negative electrode material of lithium battery - Google Patents
Coating equipment and coating method for silicon-carbon negative electrode material of lithium battery Download PDFInfo
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- CN113398811A CN113398811A CN202110678927.0A CN202110678927A CN113398811A CN 113398811 A CN113398811 A CN 113398811A CN 202110678927 A CN202110678927 A CN 202110678927A CN 113398811 A CN113398811 A CN 113398811A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of lithium batteries, and particularly relates to coating equipment for a silicon-carbon negative electrode material of a lithium battery, which comprises a hollow box and a piston cylinder, wherein the upper end of the hollow box is rotatably connected with the hollow cylinder, the lower end of the hollow cylinder is provided with a stirring mechanism, the side wall of the hollow box is provided with a feeding mechanism, the upper end of the piston cylinder is fixedly connected with an L-shaped plate, the lower end of a first screw rod is rotatably connected with a piston, and a pressurizing and heating mechanism is arranged between the piston cylinder and the hollow cylinder; a coating method of a silicon-carbon negative electrode material of a lithium battery comprises the steps of S1, pulling out a sealing plug, and feeding materials into a feeding pipe to enable the materials to enter a hollow box. According to the invention, the stirring rods rotate and move up and down in a reciprocating manner, so that the materials in the hollow box are fully stirred, pressurized and heated simultaneously, the uniform stirring process is accelerated, and the materials can be automatically discharged.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a coating device and a coating method for a silicon-carbon negative electrode material of a lithium battery.
Background
The poor compatibility of the artificial graphite and the electrolyte and the irreversible decomposition of the organic solvent on the carbon negative electrode can generate negative effects on the electrode behavior, so that the graphite layer expands and contracts to cause the graphite layer to be peeled off, thereby reducing the cycle efficiency; in order to improve the defects of the artificial graphite, the prior art uses the artificial graphite as a raw material, and carries out surface modification treatment on the artificial graphite, for example, the artificial graphite is coated and modified by a thermal polycondensation method, so as to obtain a negative electrode material with good chemical properties and high charge-discharge efficiency.
At present, in the production process of silicon-carbon cathode materials, a second intermediate product obtained by crushing and grading a block subjected to cold isostatic pressing needs to be placed in a solid-phase reactor for coating to obtain a third intermediate product. In order to reduce the production cost, the organic carbon precursor for coating is generally asphalt, the traditional coating method is to pour the particle powder obtained from the second intermediate product and asphalt solution into a reactor for mixing and stirring, the asphalt solution poured into the reactor is easy to coagulate and adhere particles to form large blocks, so that the reactor needs to spend a long time to separate the large blocks to form a third intermediate product which is uniformly stirred.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides a coating device and a coating method for a silicon-carbon negative electrode material of a lithium battery.
(II) technical scheme
In order to solve the technical problems, the invention provides a coating device for a silicon-carbon negative electrode material of a lithium battery, which comprises a hollow box and a piston cylinder, wherein the upper end of the hollow box is rotatably connected with the hollow cylinder, the lower end of the hollow cylinder is provided with a stirring mechanism, the lower end of the hollow box is provided with a discharging mechanism, the side wall of the hollow box is provided with a feeding mechanism, the upper end of the piston cylinder is fixedly connected with an L-shaped plate, the inner top of the L-shaped plate is fixedly connected with a motor, the output end of the motor is fixedly connected with a first telescopic rod, the lower end of the first telescopic rod is fixedly connected with a first lead screw, the first lead screw penetrates through the piston cylinder and is in threaded connection with the piston cylinder, the lower end of the first lead screw is rotatably connected with a piston, the piston is in sliding connection with the inner wall of the piston cylinder, the upper end of the piston cylinder is fixedly connected with a heating box, and the inner wall of the heating box is fixedly connected with a plurality of heating wires, a pressurizing and heating mechanism is arranged between the piston cylinder and the hollow cylinder, the side wall of the piston cylinder penetrates through and is fixedly connected with an air suction pipe, and a first one-way valve is arranged on the air suction pipe;
preferably, the stirring mechanism comprises a second telescopic rod fixedly connected with the lower end of the hollow cylinder, the lower end of the second telescopic rod is fixedly connected with a second lead screw, the inner wall of the hollow box is fixedly connected with a slide block, the second lead screw penetrates through the slide block and is in threaded connection with the slide block, the lower end of the second lead screw is fixedly connected with a connecting rod, the connecting rod is fixedly connected with two hollow rods, the side walls of the two hollow rods are respectively penetrated and provided with a plurality of air holes, the side walls of the two hollow rods are respectively fixedly connected with a plurality of stirring rods, a transmission pipe is penetrated and fixedly connected between the two hollow rods, and a long hose is penetrated and fixedly connected between one hollow rod and the hollow cylinder;
preferably, the discharging mechanism comprises a discharging pipe penetrating through and fixedly connected with the hollow box, a hollow block is fixedly connected to the side wall of the discharging pipe, a first magnetic block is slidably connected to the inner wall of the hollow block, a sliding plate is fixedly connected to the side wall of the first magnetic block, the sliding plate penetrates through the discharging pipe and is slidably connected with the inner wall of the discharging pipe, a stop block is fixedly connected to the lower end of the hollow box, a third telescopic rod is fixedly connected between the stop block and the sliding plate, a discharging groove is formed in the sliding plate in a penetrating manner, a spring is fixedly connected between the first magnetic block and the inner wall of the hollow block, and a second magnetic block and a third magnetic block are fixedly connected to the lower end;
preferably, an L-shaped pipe is fixedly connected between the hollow block and the hollow box, and a pressure valve is mounted on the L-shaped pipe;
preferably, the feeding mechanism comprises a feeding pipe which penetrates through the hollow box and is fixedly connected with the hollow box, the upper end of the feeding pipe penetrates through and is fixedly connected with a conduction pipe, the conduction pipe penetrates through and is in sliding connection with a sealing plug, the sealing plug penetrates through and is in threaded connection with a threaded handle, and the threaded handle is in threaded connection with the upper end of the feeding pipe;
preferably, the heating and pressurizing mechanism comprises a first gas pipe which penetrates through and is fixedly connected between the piston cylinder and the heating box, a T-shaped block is fixedly connected to the upper end of the hollow box, a sealing cover is fixedly connected to the side wall of the T-shaped block, the sealing cover is rotatably connected with the upper end of the hollow cylinder, a second gas pipe penetrates through and is fixedly connected between the sealing cover and the heating box, and a second one-way valve is mounted on the second gas pipe;
preferably, the hollow cylinder penetrates through and is fixedly connected with a driven wheel, the upper end of the first telescopic rod penetrates through and is fixedly connected with a driving wheel, and a conveying belt is rotatably connected between the driven wheel and the driving wheel;
the invention also discloses a coating method of the lithium battery silicon-carbon negative electrode material, which comprises the following steps:
s1, pulling out the sealing plug, and feeding the material into the feeding pipe to enable the material to enter the hollow box;
s2, starting the plurality of heating wires and the motor, enabling the plurality of stirring rods to reciprocate up and down and rotate, and heating and pressurizing the hollow box to fully stir the hollow box;
and S3, when the stirring is completed, continuously pressurizing, and automatically discharging.
The technical scheme of the invention has the following beneficial technical effects:
1. a cavity section of thick bamboo rotates and drives a plurality of puddlers and rotate, and under the spacing of slider, the second lead screw drives it and carries out reciprocating motion from top to bottom in the pivoted, can carry out intensive mixing to the material of adding, can be fast with the material stirring.
2. The piston moves downwards and extrudes the air in the piston to send the heated gas to the two hollow rods, the two hollow rods radiate the hot gas through the air holes, the hollow box is heated and pressurized, the material can be stirred to form, and the stirring process of the material is accelerated.
3. In the piston is continuous conveys gas to the hollow case, the continuous increase of atmospheric pressure in the hollow case, to material intensive mixing back, when the pressure in the hollow case is greater than the value of pressure valve, the pressure valve is opened, can discharge the material after will stirring through the discharging pipe promptly, realizes automatic blowing, is bringing the facility for using.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is an enlarged view of the structure at B in FIG. 1;
FIG. 4 is an enlarged view of the structure at C in FIG. 1;
fig. 5 is a schematic view of the configuration of the hollow shaft and the stirring shaft of fig. 1.
In the figure: 1 piston cylinder, 2 discharge pipes, 3 motors, 4 first telescopic rods, 5 first screw rods, 6 driving wheels, 7 heating boxes, 8 heating wires, 9 second telescopic rods, 10 second screw rods, 11 long hoses, 12 hollow rods, 13 stirring rods, 14 hollow boxes, 15 second air pipes, 16 third telescopic rods, 17 first air pipes, 18 pistons, 19 air suction pipes, 20 driven wheels, 21 conveyor belts, 22 hollow cylinders, 23 sealing covers, 24 feeding pipes, 25 sealing plugs, 26 conduction pipes, 27 threaded handles, 28 pressure valves, 29L-shaped pipes, 30 hollow blocks, 31 springs, 32 third magnetic blocks, 33 first magnetic blocks, 34 second magnetic blocks and 35 sliding plates.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description.
As shown in the figures 1 and 2, respectively, as shown in fig. 3, 4 and 5, the coating apparatus for a silicon-carbon negative electrode material of a lithium battery provided by the invention comprises a hollow box 14 and a piston cylinder 1, wherein the upper end of the hollow box 14 is rotatably connected with a hollow cylinder 22, a first sealing ring is arranged between the hollow cylinder 22 and the hollow box 14, the first sealing ring is fixedly connected with the hollow box 14, the lower end of the hollow cylinder 22 is provided with a stirring mechanism, the stirring mechanism comprises a second telescopic rod 9 fixedly connected with the lower end of the hollow cylinder 22, the lower end of the second telescopic rod 9 is fixedly connected with a second lead screw 10, the inner wall of the hollow box 14 is fixedly connected with a sliding block, the second lead screw 10 penetrates through the sliding block and is in threaded connection with the sliding block, the lower end of the second lead screw 10 is fixedly connected with a connecting rod, the connecting rod is fixedly connected with two hollow rods 12, the side walls of the two hollow rods 12 are both penetrated through and provided with a plurality of air holes, and heat can be uniformly dispersed into the hollow box 14 through the plurality of air holes.
The side walls of the two hollow rods 12 are fixedly connected with a plurality of stirring rods 13, a transmission pipe penetrates through and is fixedly connected between the two hollow rods 12, run through and fixedly connected with long hose 11 between one of them cavity pole 12 and the cavity section of thick bamboo 22, the lower extreme of hollow case 14 is equipped with discharge mechanism, discharge mechanism is including running through hollow case 14 and rather than fixed connection's discharging pipe 2, the hollow block 30 of lateral wall fixedly connected with of discharging pipe 2, the inner wall sliding connection of hollow block 30 has first magnetic path 33, the lateral wall fixedly connected with sliding plate 35 of first magnetic path 33, sliding plate 35 runs through discharging pipe 2 and rather than inner wall sliding connection, the lower extreme fixedly connected with dog of hollow case 14, fixedly connected with third telescopic link 16 between dog and the sliding plate 35, sliding plate 35 runs through and is equipped with the blown down tank, be equipped with sealed the pad between sliding plate 35 and the discharging pipe 2, sealed pad and the upper and lower end fixed connection of sliding plate 35.
A spring 31 is fixedly connected between the first magnetic block 33 and the inner wall of the hollow block 30, a second magnetic block 34 and a third magnetic block 32 are fixedly connected to the lower end of the hollow block 30, an L-shaped pipe 29 is fixedly connected between the hollow block 30 and the hollow box 14, a pressure valve 28 is installed on the L-shaped pipe 29, the magnetic poles of the opposite surfaces of the first magnetic block 33 and the third magnetic block 32 are different, the magnetic poles of the opposite surfaces of the third magnetic block 32 and the second magnetic block 34 are different, and the magnetic force between the third magnetic block 32 and the second magnetic block 34 is larger than the elastic force of the spring 31.
The output end fixedly connected with of motor 3 is first telescopic link 4, the first lead screw 5 of lower extreme fixedly connected with of first telescopic link 4, first lead screw 5 runs through piston cylinder 1 and rather than threaded connection, the lower extreme of first lead screw 5 rotates and is connected with piston 18, the inner wall sliding connection of piston 18 and piston cylinder 1, the upper end fixedly connected with heating cabinet 7 of piston cylinder 1, a plurality of heater 8 of inner wall fixedly connected with of heating cabinet 7, be equipped with the pressurization heating mechanism between piston cylinder 1 and the cavity section of thick bamboo 22, the heating pressurization mechanism includes the first gas-supply pipe 17 that runs through and fixed connection between piston cylinder 1 and the heating cabinet 7, the upper end fixedly connected with T-shaped piece of hollow case 14, the sealed lid 23 of lateral wall fixedly connected with of T-shaped piece, sealed lid 23 rotates with the upper end of cavity section of thick bamboo 22 to be connected, be equipped with the second sealing washer between sealed lid 23 and the cavity section of thick bamboo 22, the inner wall fixed connection of second sealing washer and sealed lid 23.
Run through and fixedly connected with second gas-supply pipe 15 between sealed lid 23 and the heating cabinet 7, install the second check valve on the second gas-supply pipe 15, the second check valve can only allow gas to enter into hollow case 14 from the second gas-supply pipe 15, hollow cylinder 22 runs through and fixedly connected with follows driving wheel 20, the upper end of first telescopic link 4 runs through and fixedly connected with action wheel 6, it is connected with conveyer belt 21 to rotate between action wheel 20 and the action wheel 6 from the driving wheel, it is little than the radius of action wheel 6 from driving wheel 20, the lateral wall of piston cylinder 1 runs through and fixedly connected breathing pipe 19, install first check valve on the breathing pipe 19, first check valve only allows external gas to enter into piston cylinder 1, first telescopic link 4 and second telescopic link 9 are the rectangle telescopic link.
The invention also discloses a coating method of the lithium battery silicon-carbon negative electrode material, which comprises the following steps:
s1, pulling out the sealing plug 25, and feeding the material into the feeding pipe 24 to enable the material to enter the hollow box 14;
s2, starting the plurality of heating wires 8 and the motor 3, reciprocating the plurality of stirring rods 13 up and down and rotating, and heating and pressurizing the hollow box 14 to fully stir;
and S2, when the stirring is completed, continuously pressurizing, and automatically discharging.
The working principle and the using process of the invention are as follows: when the user needs to feed in, rotate screw handle 27 and make it move upwards, until screw handle 27 no longer carries out threaded connection with filling tube 24, later pull out sealing plug 25 upwards, feed in to hollow box 14 through filling tube 24, when the completion of feeding in, seal plug 25 seals conduction pipe 26 through screw handle 27.
Between start a plurality of heater 8 and generate heat, the heat storage is in heating cabinet 7, later 3 forward rotations of starter motor, motor 3 rotates and drives first telescopic link 4, first lead screw 5, action wheel 6, conveyer belt 21, from driving wheel 20, hollow section of thick bamboo 22 rotates, first lead screw 5 drives piston 18 and moves down and with the air extrusion wherein and through first gas-supply pipe 17 when rotating, heating cabinet 7, second gas-supply pipe 15 enters into sealed lid 23 and hollow section of thick bamboo 22, hollow section of thick bamboo 22 is with gaseous through overlength hose 11, in two hollow rods 12, two hollow rods 12 are with the gaseous heat dissipation of hot nature through a plurality of gas pockets come out, heat pressurization is carried out to hollow box 14.
Meanwhile, the hollow cylinder 22 rotates to drive the second telescopic rod 9, the second screw rod 10, the two hollow rods 12 and the stirring rods 13 to rotate, and the second screw rod 10 rotates while being driven to move up and down in a reciprocating mode under the limiting effect of the sliding block, so that the added materials can be fully stirred.
According to the setting proportion of the size radius of the driving wheel 6 and the driven wheel 20, the driving wheel 6 rotates for one circle, the driven wheel 20 rotates for multiple circles, the piston 18 continuously transmits gas into the hollow box 14, the air pressure in the hollow box 14 is continuously increased, when the second lead screw 10 rotates for multiple circles, after materials are sufficiently stirred, when the pressure in the hollow box 14 is greater than the value of the pressure valve 28, the pressure valve 28 is opened, the first magnetic block 33, the third magnetic block 32 and the sliding plate 35 are pushed to move towards the third telescopic rod 16 through the air pressure, the first magnetic block 33 compresses the spring 31, the third magnetic block 32 and the second magnetic block 34 are attracted, meanwhile, the discharging groove is opposite to the discharging pipe 2, namely, the stirred materials can be discharged through the discharging pipe 2, meanwhile, the piston 18 continues to move downwards, the materials are discharged through increasing of the pressure in the hollow box 14, and automatic discharging is achieved.
After discharging, the motor 3 is started to rotate reversely, outside air enters the piston cylinder 1 to be stored under the limiting of the first one-way valve and the second one-way valve, and meanwhile, the third magnetic block 32 and the first magnetic block 33 are pulled to enable the third magnetic block 32 not to attract the second magnetic block 34, so that the discharge pipe 2 is sealed by the sliding plate 35.
It is to be understood that the above-described embodiments of the invention are merely illustrative of or illustrative of the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the invention should be included in the protection scope of the invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. The utility model provides a cladding equipment of lithium cell silicon carbon negative electrode material, includes hollow case (14) and piston cylinder (1), its characterized in that, the upper end of hollow case (14) is rotated and is connected with hollow cylinder (22), the lower extreme of hollow cylinder (22) is equipped with rabbling mechanism, the lower extreme of hollow case (14) is equipped with discharge mechanism, the lateral wall of hollow case (14) is equipped with reinforced mechanism, the upper end fixedly connected with L shaped plate of piston cylinder (1), the interior top fixedly connected with motor (3) of L shaped plate, the output fixedly connected with first telescopic link (4) of motor (3), the lower extreme fixedly connected with first lead screw (5) of first telescopic link (4), first lead screw (5) run through piston cylinder (1) and rather than threaded connection, the lower extreme of first lead screw (5) is rotated and is connected with piston (18), piston (18) and the inner wall sliding connection of piston cylinder (1), the upper end fixedly connected with heating cabinet (7) of piston cylinder (1), the inner wall fixedly connected with a plurality of heater (8) of heating cabinet (7), be equipped with the pressure heating mechanism between piston cylinder (1) and cavity section of thick bamboo (22), the lateral wall of piston cylinder (1) runs through and fixed connection breathing pipe (19), install a check valve on breathing pipe (19).
2. The coating device of silicon carbon anode material for lithium battery as claimed in claim 1, the stirring mechanism comprises a second telescopic rod (9) fixedly connected with the lower end of the hollow cylinder (22), the lower end of the second telescopic rod (9) is fixedly connected with a second screw rod (10), the inner wall of the hollow box (14) is fixedly connected with a slide block, the second screw rod (10) penetrates through the sliding block and is in threaded connection with the sliding block, the lower end of the second screw rod (10) is fixedly connected with a connecting rod, the connecting rod is fixedly connected with two hollow rods (12), the side walls of the two hollow rods (12) are provided with a plurality of air holes in a penetrating way, the side walls of the two hollow rods (12) are fixedly connected with a plurality of stirring rods (13), a transmission pipe is penetrated and fixedly connected between the two hollow rods (12), one hollow rod (12) and the hollow cylinder (22) are connected with a long hose (11) in a penetrating and fixed mode.
3. The coating equipment for the silicon-carbon anode material of the lithium battery is characterized in that the discharging mechanism comprises a discharging pipe (2) penetrating through and fixedly connected with a hollow box (14), a hollow block (30) is fixedly connected to the side wall of the discharging pipe (2), a first magnetic block (33) is slidably connected to the inner wall of the hollow block (30), a sliding plate (35) is fixedly connected to the side wall of the first magnetic block (33), the sliding plate (35) penetrates through and slidably connected with the inner wall of the discharging pipe (2), a stop block is fixedly connected to the lower end of the hollow box (14), a third telescopic rod (16) is fixedly connected between the stop block and the sliding plate (35), a discharging groove is formed in the sliding plate (35) in a penetrating manner, and a spring (31) is fixedly connected between the first magnetic block (33) and the inner wall of the hollow block (30), the lower end of the hollow block (30) is fixedly connected with a second magnetic block (34) and is slidably connected with a third magnetic block (32).
4. The coating equipment for the silicon-carbon negative electrode material of the lithium battery is characterized in that an L-shaped pipe (29) is fixedly connected between the hollow block (30) and the hollow box (14), and the L-shaped pipe (29) is provided with a pressure valve (28).
5. The coating equipment for the silicon-carbon anode material of the lithium battery as claimed in claim 1, wherein the feeding mechanism comprises a feeding pipe (24) which penetrates through and is fixedly connected with the hollow box (14), the upper end of the feeding pipe (24) penetrates through and is fixedly connected with a conduction pipe (26), the conduction pipe (26) penetrates through and is slidably connected with a sealing plug (25), the sealing plug (25) penetrates through and is in threaded connection with a threaded handle (27), and the threaded handle (27) is in threaded connection with the upper end of the feeding pipe (24).
6. The coating equipment for the silicon-carbon anode material of the lithium battery according to claim 1, wherein the heating and pressurizing mechanism comprises a first air conveying pipe (17) which penetrates through and is fixedly connected between the piston cylinder (1) and the heating box (7), a T-shaped block is fixedly connected to the upper end of the hollow box (14), a sealing cover (23) is fixedly connected to the side wall of the T-shaped block, the sealing cover (23) is rotatably connected with the upper end of the hollow cylinder (22), a second air conveying pipe (15) penetrates through and is fixedly connected between the sealing cover (23) and the heating box (7), and a second one-way valve is mounted on the second air conveying pipe (15).
7. The coating equipment for the silicon-carbon anode material of the lithium battery is characterized in that a driven wheel (20) penetrates through and is fixedly connected with the hollow cylinder (22), a driving wheel (6) penetrates through and is fixedly connected with the upper end of the first telescopic rod (4), and a conveying belt (21) is rotatably connected between the driven wheel (20) and the driving wheel (6).
8. A coating method of a silicon-carbon negative electrode material of a lithium battery is characterized by comprising the following steps:
s1, pulling out the sealing plug (25), feeding the material into the feeding pipe (24) and enabling the material to enter the hollow box (14);
s2, starting the plurality of heating wires (8) and the motor (3), enabling the plurality of stirring rods (13) to reciprocate up and down and rotate, and heating and pressurizing the hollow box (14) to fully stir;
and S2, when the stirring is completed, continuously pressurizing, and automatically discharging.
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| CN202110678927.0A CN113398811A (en) | 2021-06-18 | 2021-06-18 | Coating equipment and coating method for silicon-carbon negative electrode material of lithium battery |
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| CN202110678927.0A CN113398811A (en) | 2021-06-18 | 2021-06-18 | Coating equipment and coating method for silicon-carbon negative electrode material of lithium battery |
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| CN113750945A (en) * | 2021-09-23 | 2021-12-07 | 杭州永盛塑料抗静电材料厂 | Antistatic agent production is with mixing compound cauldron |
| CN118059725A (en) * | 2024-04-18 | 2024-05-24 | 都汇康健(成都)医疗科技有限公司 | Raw material mixing device and mixing method for candy production |
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