Method and apparatus for the high-throughput preparation of a cement-based material using step-by-step dosing

Abstract

The present invention describes a method and apparatus for the high-throughput preparation of a cement-based material using a step-by-step dosing system. The method comprises step-by-step weighing of raw materials into structural units of a cement-based material; pre-setting n parallel columns of dosing groups to form a weighing sequence of "one main group and multiple auxiliary groups," wherein each column of dosing groups comprises n dosing devices, n being an integer, and n ≥ 1; performing a weighing at a first-stage dosing group of respective columns to obtain a1...a1n; and performing a subsequent-stage weighing based on the mass obtained and the mass required for a formulation ratio at a second-stage dosing group of respective columns to obtain a2...a2n; and the repetition of the above steps until the summarizing weighing result at an+1 at the bottom of the first column satisfies a designed formulation ratio of the cement-based material composition. Through step-by-step dosing, the present invention enables the accurate weighing of basic structural unit components in a high-throughput preparation process, reduces experimental errors, achieves precise weighing and automated operation in the high-throughput preparation of a cement-based material, and further reduces labor and resource costs for materials research and development. Figure for abstract:

Description

Title of the invention: Method and apparatus for high throughput preparation of a cement-based material using step-by-step dosing Technical field

[0001] The present invention relates to the field of cement production and testing and, in particular, to a method and apparatus for carrying out high throughput preparation of a cement-based material by means of step-by-step dosing. TECHNICAL BACKGROUND

[0002] High-throughput preparation processes of cement-based materials are characterized by rapid research and development, low cost, high efficiency, and the like. Such a process is the basis and premise of rapid iterative optimization of cement-based materials, and is one of the important ways to promote the revolution of research and development paradigm and facilitate the rapid transformation and development of cement industry. However, due to the complexity and multiplicity of cement-based materials, the products produced therefrom have different intermediate and final products, and each step involves different raw materials, numbers, and types. The preparation process of cement-based materials has many weighing steps, and the requirements for weighing accuracy are high.Complete automation of a high-throughput preparation process for a cement-based material therefore represents a major challenge.

[0003] At present, the prior art generally uses flow valves to control the mass of the sample, but this method does not take into account problems such as the fineness and particle size of the powder. When the fineness of the powder is excessively high, the particles tend to agglomerate due to the van der Waals force, which affects the weighing accuracy, and results in excessive weighing errors, especially when the measured weight in grams is too small. In addition, an admixture such as a grinding agent, a water-reducing agent, and so on must be additionally added during the high-throughput preparation of a cement-based material, and the required mass thereof may sometimes be only about 1 g.Therefore, existing high-throughput preparation techniques are only suitable for the formulation of cement-based materials in large batches, while operations for low-mass cement-based materials for testing still rely to a large extent on semi-manual processes, and the procedure is cumbersome and prone to some human errors, which affects accuracy. tests, and seriously hinders the practical application and promotion of such techniques.

[0004] SUMMARY

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] The technical solutions of the present invention are as follows:

[0007] A method for high throughput preparation of a cementitious material using stepwise dosing, comprising performing stepwise weighing of raw materials of structural units of a cementitious material;

[0008] presetting n parallel columns of dosing groups to form a weighing sequence of "one main group and multiple auxiliary groups", wherein each column of dosing groups comprises n dosing devices, n being an integer, and n 1;

[0009] carrying out weighing at a first-stage dosing group of the respective columns to obtain al...aln, and

[0010] performing a next-stage weighing based on the obtained mass and the required mass for a formulation ratio at a second-stage dosing group of the respective columns to obtain a2...a2n; and

[0011] repeating the above steps until the weighing result summarized at an + 1 at the very bottom of the first column satisfies a designed formulation ratio of the composition of the cement-based material.

[0012] The method further comprises uniform mixing and storing,

[0013] the uniform mixing and storage being arranged sequentially after the stepwise weighing,

[0014] the uniform mixing serving to uniformly mix the accurately weighed raw materials, and

[0015] storage for storing a target material formed by uniformly mixing multiple raw materials.

[0016] In the designed formulation ratio, for a powdery raw material weighing less than 1 g, the accuracy is 0.01 g, and when the weight is between 1 g and 500 g, the accuracy is 0.2 g, and

[0017] for a gravel type raw material, the precision is 1 g.

[0018] An apparatus for high-throughput preparation of a cement-based material using step-by-step dosing, comprising a multi-channel device for raw materials, a feed control device, a mixing device, and a storage device,

[0019] the multi-channel device for raw materials is equipped with a tube which connects it to the feed control device,

[0020] the feed control device comprising a plurality of linearly arranged metering groups, the metering groups forming at least one column, and the metering groups comprising at least one metering device arranged in sequence from top to bottom,

[0021] wherein the lowest metering device of the first column of metering groups is adapted to connect to the lowest metering device of each of the other columns of metering groups, and to connect to the mixing device, the mixing device being connected to the storage device.

[0022] The counting groups form at least two columns.

[0023] The dosing device comprises a support frame and a weighing bucket, the support frame is equipped with a measuring instrument, and the upper and lower openings of the weighing bucket tube are each equipped with a solenoid flow valve;

[0024] the weighing bucket is used to contain a solid raw material to be weighed.

[0025] The feed control device further comprises a liquid weighing container, and the liquid weighing container is connected to the lowest dosing device of the first column of dosing groups.

[0026] The multi-channel device for raw materials comprises a plurality of primary storage compartments adapted to receive structural units in a cement-based material;

[0027] the primary storage compartments are equipped with a flow solenoid valve at their lower end and are connected to the feed control device by means of a tube.

[0028] The mixing device comprises a plurality of secondary pre-loading tanks configured to uniformly mix the raw materials fed by the multi-channel device for raw materials and accurately weighed by the feed control device;

[0029] the secondary pre-loading tanks contain mixing balls, and are connected to a discharge tube at their lower end; where the discharge is controlled by a solenoid flow valve, and where the discharge tube is covered with a screening grid.

[0030] The storage device comprises a plurality of storage tanks, and the storage tanks are connected to the discharge tube of the secondary pre-charging tanks.

[0031] The apparatus also comprises cleaning devices, and the multi-channel device for raw materials, the feeding control device, the mixing device, and the storage device are respectively connected to the cleaning devices.

[0032] In operation, the present invention comprises the multi-channel device for raw materials, the feeding control device, the mixing device, and the storage device, wherein, by means of step-by-step dosing, the feeding control device enables the basic elements of structural units to be accurately weighed in a high-throughput preparation process, reduces experimental errors, and achieves precision weighing and operation in the high-throughput preparation of a cement-based material.

[0033] The present invention is simple to use and highly applicable, and can enable rapid iterative optimization of cement-based materials, reduce the impact of human errors, and further reduce labor and resource costs for materials research and development. Brief description of the drawings

[0034] [Fig.l] [Fig.l] is a schematic structural diagram of the apparatus of the present invention; and

[0035] [Fig.2] [Fig.2] is a schematic route diagram for the devices of stepwise dosage of the present invention.

[0036] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] As shown in [Fig.l] and 2, the present invention provides an apparatus for high throughput preparation of a cement-based material using step-by-step dosing, the apparatus comprising a multi-channel device for raw materials, a feed control device, a mixing device, and a storage device.

[0038] The multi-channel device for raw materials is equipped with a tube so as to be connected to the feed control device.

[0039] The feed control device comprises a plurality of linearly arranged metering groups, the metering groups form at least one column (i.e., multi-route), and the metering groups comprise at least one metering device arranged in sequence from top to bottom (i.e., multi-step). The multi-route and multi-step configurations are used to perform weighing, respectively, thereby combining coarse weighing and fine weighing. The result of the coarse weighing serves as a basis, and is corrected by means of the fine weighing.

[0040] The lowest metering device of the first column of metering groups is adapted to connect to the lowest metering device of each of the other columns of metering groups, and to connect to the mixing device, and the mixing device is connected to the storage device.

[0041] Such a configuration facilitates the aggregation of the materials weighed by the lowest dosing device of the first column of dosing groups.

[0042] In operation, the present invention comprises the multi-channel device for raw materials, the feeding control device, the mixing device, and the storage device, wherein, by means of step-by-step dosing, the feeding control device enables the basic elements of structural units to be accurately weighed in a high-throughput preparation process, reduces experimental errors, and achieves precision weighing and operation in the high-throughput preparation of a cement-based material.

[0043] The counting groups form at least two columns. The weighing actions in each column can be selectively designed according to the specific material being weighed. For each column of dosing groups, the weighing can be carried out in a sequentially increasing manner, or sequentially decreasing manner, or first increasing then decreasing, or first decreasing then increasing, from top to bottom, and the manner is adapted according to the product and the weighing characteristics of the different materials.

[0044] The product and weighing characteristics of different materials, including material fineness, specific surface area, etc., take into account the agglomeration of the materials.

[0045] The metering device comprises a support frame and a weighing bucket, the support frame is equipped with a measuring instrument, and the upper and lower openings of the weighing bucket tube are each equipped with a flow solenoid valve;

[0046] the weighing bucket is designed to contain a solid raw material to be weighed.

[0047] The weighing bucket facilitates weighing operations, and the use of multiple weighing buckets together facilitates the accuracy of measurements made by the feed control device.

[0048] The feed control device further comprises a liquid weighing container, and the liquid weighing container is connected to the lowest dosing device of the first column of dosing groups.

[0049] A liquid raw material is accurately weighed using a volumetric method, which enables weighing with an accuracy of 1 ml ± 0.01 ml. The liquid raw material comprises an admixture for cement concrete, such as a grinding agent and a water-reducing agent.

[0050] The multi-channel device for raw materials comprises a plurality of primary storage compartments (i.e. PI, P2...Pn) adapted to receive raw materials of structural units in a cement-based material.

[0051] The primary storage compartments are equipped with a flow solenoid valve at their lower end and are connected to the feed control device by means of a tube.

[0052] Structural units are single-mineral, single-phase unit components of the cement-based material that retain specific hydration and hardening characteristics, or admixtures for cement concrete.

[0053] The plurality of primary storage compartments are provided to facilitate sorting and storage.

[0054] The mixing device comprises a plurality of secondary pre-loading tanks (i.e. Ql, Q2...Qn) configured to uniformly mix the raw materials from the multi-channel device for raw materials and accurately weighed by the feed control device.

[0055] The secondary pre-loading tanks contain mixing balls, and are connected to a discharge tube at their lower end, where discharge is controlled by a solenoid flow valve, and the discharge tube is covered with a screening grid.

[0056] The mixing balls are provided to facilitate uniform mixing of the raw materials; the screening grid is provided to facilitate blocking of the mixing balls.

[0057] The storage device comprises a plurality of storage tanks, and the storage tanks are connected to the discharge tube of the secondary pre-charging tanks.

[0058] Storage tanks facilitate the storage of a target material.

[0059] The apparatus also comprises cleaning devices, and the multi-channel device for raw materials, the feeding control device, the mixing device, and the storage device are respectively connected to the cleaning devices.

[0060] Cleaning devices are used for cleaning residual materials in the mixing device and the storage device and for pre-dispersing the materials. The cleaning devices mainly adopt gas-based cleaning. For example, an industrial blower is used.

[0061] The cleaning devices for the primary storage compartments and weighing buckets may further be used to pre-disperse the materials contained therein by means of compressed air in order to avoid excessive agglomeration.

[0062] The stepwise assay of the present invention is designed and carried out according to the following steps:

[0063] 1) design of the number of dosage groups according to the characteristics physical such as apparent (bulk) density, specific surface area and fineness of raw materials; and

[0064] 2) control of the feed rate by means of a flow valve electromagnetic and adopting multi-stage dosing to achieve precise weighing step by step.

[0065] Specifically, n parallel columns of dosing groups are preset to form a weighing sequence of "one main group and multiple auxiliary groups", wherein each column of dosing groups comprises n dosing devices, n being an integer, and n 1.

[0066] As shown in [Fig.2](a), for each column, weighing at the first-stage main dosing group gives al, and weighing at the first-stage auxiliary dosing groups gives ail, al2...aln. [Fig.2](a) shows a route diagram of the step-wise dosing in the present invention.

[0067] The next stage weighing is carried out according to the mass obtained and the mass required for a formulation ratio. For each column, weighing at the second stage dosing group provides a2, and weighing at the second stage auxiliary dosing groups provides a21, a22...a2n.

[0068] The above steps are repeated until the weighing result summarized at an + 1 at the very bottom of the first column satisfies a designed formulation ratio of the cement-based material composition.

[0069] According to the present invention, accurate weighing of the basic elements of structural units during a high-throughput preparation process can be achieved by means of step-by-step weighing, so as to rectify material weighing errors resulting from agglomeration and excessively small weighing amounts. The present invention assists the technical application and promotion of high-throughput methods in the field of cement-based materials, and makes it possible to fully demonstrate the advantages and characteristics of high-throughput experimental techniques for cement-based materials.

[0070] The method further comprises uniform mixing and storing.

[0071] Uniform mixing and storage are arranged sequentially after step weighing.

[0072] Uniform mixing allows for uniform mixing of accurately weighed raw materials, and

[0073] the storage serves to store a target material formed by uniformly mixing multiple raw materials.

[0074] In the present invention, step-by-step dosing is adopted during feeding in order to achieve precision weighing of multiple raw materials in a cement-based material.

[0075] In use, the method for high throughput preparation of a cement-based material using stepwise dosing comprises the following steps:

[0076] designing a formulation ratio based on the composition of the cement-based material,

[0077] firstly, using the multi-channel raw material device to separately feed multiple raw materials of structural units into a cement-based material,

[0078] secondly, using the feed control device to weigh the raw materials of the structural units,

[0079] then, using the mixing device to uniformly mix the accurately weighed raw materials, and

[0080] finally, receiving by the storage tank device multiple uniformly mixed raw materials, thereby forming a target material.

[0081] When the feed control device performs weighing, the number of dosing groups is predefined, in which n columns of dosing groups (i.e., multi-route) are included, each column of dosing groups has n dosing devices (i.e., multi-step), n is an integer, and n 1.

[0082] The lowest dosing device of the first column of dosing groups is adapted to connect to the lowest dosing device of each of the remaining columns of dosing groups. The adoption of step-by-step weighing is to adopt multi-route and multi-step weighing to obtain, by gradual convergence, the mass to be weighed, thereby achieving precision weighing.

[0083] In the designed formulation ratio, for a powdery raw material weighing less than 1 g, the accuracy is 0.01 g, and when the weight is between 1 g and 500 g, the accuracy is 0.2 g, and for a gravel raw material (i.e., when weighing a heavier raw material), the accuracy is 1 g.

[0084] The present invention enables precision weighing for high-throughput preparation of a small-mass cement-based material to be tested, and solves problems such as low accuracy of sample mass due to flow valve control, and dependence on manual labor for weighing a small mass, thereby reducing economic and labor costs, and improving research and development efficiency.

[0085] In order to explain the present invention in detail for a better understanding of the technical solutions and advantages of the present invention, the contents of the present invention will be described in detail with reference to the accompanying examples and drawings, but the present invention is not limited to the following examples only.

[0086] Example 1:

[0087] The objective of Example 1 was to prepare 500 g of Portland cement P. I having a specific surface area of ​​350 ± 20 m2 / kg. The formulation ratio of the cement to be prepared is shown in Table 1. According to the design of the target cement, four clinker monominerals and dihydrated gypsum having a specific surface area of ​​350 ± 20 m2 / kg were placed respectively in the primary storage compartments P1, P2, P3, P4 and P5 of the multi-channel device for raw materials (see [Fig.l]). The raw materials were weighed using the feeding control device according to the formulation ratio of the raw materials of the cement clinker to be prepared, as shown in Table 1. The feeding control device adopted a two-route connection (see [Fig.2] (b)). The masses weighed in the dosing devices of the different stages are indicated in Table 2.The weighed raw materials were fed into the mixing device. The secondary pre-loading tanks of the mixing device contained agate mixing balls of a certain mass (at a ball-to-raw material ratio of 1:10). After the target cement was uniformly mixed in the pre-loading tanks, the target cement entered the respective terminal storage tanks of the target material, and the storage tanks were stored tightly, resulting in cement sample C. [Fig.2](b) shows the route diagram of the step-by-step batching in Example 1.

[0088] Table 1. Composition of the designed clinker (mass / g)

[0089] [Tables 1] Number Alite Belite Tricalcic aluminate Aluminoferrite tetr acalcic Dihydr ate gypsum C 290 95 30 60 25

[0090] Table 2. The masses weighed in the dosing devices of the respective stages for sample C (mass / g)

[0091] [Tables2] Number Alite Belite Aluminate tri aie ic Aluminoferrite tetr acalcic Gypsum dihydr até al 270.2 100.7 15.0 58 24.9 a2 287.8 94.0 21.5 62.1 24.8 a3 290.1 ​​94.9 30.0 60.2 24.8 garlic 2.6 1.2 10.2 0 0 a21 2.3 0.9 8.5 0 0

[0092] The assay results at a3 in Table 2 show that the errors of the weighed masses are within ± 0.2 g. In addition, the mineral composition of the cement M1 prepared above was determined by XRD, and the results of the XRD determination of sample M were quantitatively analyzed by the Rietveld method.

[0093] The results showed that the refinement and adjustment factors Rwp were all well below 10. The results of the quantitative XRD analysis of the sample are shown in Table 3. As can be seen from the table, the results of the XRD determination largely correspond to the defined composition of the cement, and the errors are largely within ± 0.5 g. This indicates that the cement with the defined composition was successfully prepared according to the method.

[0094] Table 3. Results of XRD determination (Rietveld method) of sample C (mass percentage / %)

[0095] [Tables3] Number Alite Belite Aluminate sort aie ique Aluminoferrite tetr acalcic Gypsum dihyd rat C 57.92 18.92 6.13 11.94 5.09

[0096] Example 2:

[0097] The objective of Example 2 was to prepare 300 g of Portland slag cement. The designed formulation ratio of the cement to be prepared is shown in Table 4. According to the design of the target cement, four clinker monominerals, dihydrated gypsum, and slag were placed respectively in the primary storage compartments P1, P2, P3, P4, P5, and P6 of the multi-channel device for raw materials (see [Fig.l]). The raw materials were weighed using the feeding control device according to the raw material formulation ratio of the cement clinker to be prepared, as shown in Table 4. The feeding control device adopted a three-route connection (see [Fig.2] (c)). The weighed masses in the batching devices of different stages are shown in Table 5. The weighed raw materials were fed into the mixing device.The secondary pre-loading tanks of the mixing device contained agate mixing balls of a certain mass (at a ball-to-raw material ratio of 1:10). After the target cement was uniformly mixed in the pre-loading tanks, the cement . target material entered the respective terminal storage tanks of the target material, and the storage tanks were stored tightly, resulting in a cement sample S. [Fig.2](c) shows the route diagram of the step-by-step batching in Example 2.

[0098] Table 4. Composition of the designed clinker (mass / g)

[0099] [Tables4] Number Alite Belite Aluminate trica Icique Aluminoferrite tetr acalcic Gypsum dihy drate Slag S 114 36 15 24 15 96

[0100] Table 5. The masses weighed in the dosing devices of the respective stages for the sample S (mass / g)

[0101] [Tables5] Number Alite Belite Tricalcium aluminate Tracalcium aluminoferrite Dihydrated gypsum Slag al 148.7 40.1 11.3 22.3 19.2 103.6 a2 127.2 38.3 11.3 22.3 17.3 99.1 a3 108.3 35.9 11.3 22.3 13.8 94.9 a4 114.1 35.9 15.0 24.1 15.1 95.9 ail 8.9 0 2.8 3.8 0.5 1.0 a21 3.6 0 2.8 1.2 0.5 0.3 al2 2.8 0 1.2 0.8 0.8 0.9 a22 2.2 0 0.9 0.6 0.8 0.7

[0102] The assay results at a4 in Table 5 show that the errors of the weighed masses are within ±0.2 g. In addition, the slag content of cement sample S was determined and analyzed according to GB / T12960 "Quantitative Determination of Cement Components". In this method, selective dissolution is adopted for the slag component. After selective dissolution of a cement sample by a solution containing EDTA having a pH of 11.60, clinker minerals and gypsum are largely dissolved, and other components are substantially not dissolved. After the slag content determination, the internal standard method was used to perform quantitative analysis of sample S by XRD. The results showed that the refinement and adjustment factors Rwp were all well below 10.The results of quantitative XRD analysis of the sample are shown in Table 6. As can be seen from the table, the results of the determination . XRD largely correspond to the defined composition of the cement, and the errors are largely within ± 0.5 g. This indicates that the cement with the defined composition was successfully prepared according to the method.

[0103] Table 6. Results of XRD determination (internal standard method) of sample S (mass percentage / %)

[0104] [Tableauxô] Number Alite Belite Aluminate tri-alkic Aluminoferrite te tracalcic Gypsum dihyd rat Slag S 38.09 11.97 5.03 7.94 5.03 31.94

[0105] The present invention advances the technical application of high-throughput preparation of cement-based materials, improves the efficiency of rapid iterative optimization of cement-based materials, reduces the impact of human errors, saves research and development time, and reduces economic and labor costs.

Claims

[Claim 1] Claims A process for the high throughput preparation of a cement-based material using step-by-step dosing, characterized in that: the method comprises performing stepwise weighing of raw materials of structural units of a cement-based material; presetting n parallel columns of dosing groups to form a weighing sequence of "one main group and multiple auxiliary groups", wherein each column of dosing groups comprises n dosing devices, n being an integer, and n 1; performing weighing at a first-stage dosing group of respective columns to obtain al...aln, and performing next-stage weighing based on the obtained mass and the required mass for a formulation ratio at a second-stage dosing group of respective columns to obtain a2...a2n; and repeating the above steps until the weighing result summarized at an+1 at the very bottom of the first column satisfies a designed formulation ratio of the cement-based material composition. 2 A method of high throughput preparation of a cementitious material using stepwise dosing according to claim 1, further comprising uniform mixing and storage, the uniform mixing and storage being arranged sequentially after the step weighing, uniform mixing used to uniformly mix precisely weighed raw materials, and storage used to store a target material formed by the uniform mixing of multiple raw materials. 3 A method for high-throughput preparation of a cement-based material using step-by-step dosing according to claim 1, wherein, in the designed formulation ratio, for a powdery raw material weighing less than 1 g, the accuracy is 0.01 g, and when the weight is from 1 g to 500 g, the accuracy is 0.2 g, and for a gravel-type raw material, the accuracy is 1 g. 4 Apparatus for implementing the high-throughput preparation process of a cement-based material using step-by-step dosing according to any one of claims 1 to 3, characterized in that: the apparatus comprises a multi-channel device for raw materials, a feed control device, a mixing device and a storage device, the multi-channel device for raw materials being equipped with a tube so as to be connected to the feed control device, the feed control device comprising a plurality of linearly arranged metering groups, the metering groups forming at least one column, and the metering groups comprising at least one metering device arranged in sequence from top to bottom, wherein the lowest metering device of the first column of metering groups is adapted to connect to the lowest metering device of each of the other columns of metering groups, and to connect to the mixing device, the mixing device being connected to the storage device. 5 Apparatus for high throughput preparation of a cementitious material using stepwise dosing according to claim 4, wherein the dosing groups form at least two columns. 6 An apparatus for high-throughput preparation of a cement-based material using step-by-step dosing according to claim 4, wherein the dosing device comprises a support frame and a weighing bucket, the support frame is equipped with a measuring instrument, and the upper and lower openings of the weighing bucket tube are each equipped with a solenoid flow valve; and the weighing bucket is adapted to contain a solid raw material to be weighed. 7 Apparatus for high throughput preparation of a cementitious material using stepwise dosing according to claim 6, wherein the feed control device further comprises a liquid weighing container, and the liquid weighing container is connected to the lowest dosing device in the first column of dosing groups. 8 Apparatus for high throughput preparation of a cementitious material using step-by-step dosing according to claim 4, wherein the multi-channel device for raw materials comprises a plurality of primary storage compartments designed to receive structural units in a cement-based material; and the primary storage compartments are equipped with a solenoid flow valve at their lower end and are connected to the feed control device by means of a tube. 9 A high throughput cementitious material preparation apparatus using step-by-step dosing according to claim 4, wherein the mixing device comprises a plurality of secondary pre-loading tanks adapted to uniformly mix raw materials fed by the multi-channel raw material device and accurately weighed by the feed control device; the secondary pre-loading tanks contain mixing balls, and are connected to a discharge tube at their lower end, where discharge is controlled by a solenoid flow valve, and the discharge tube is covered with a screening grid; and the storage device comprises a plurality of storage tanks, and the storage tanks are connected to the discharge tube of the secondary pre-charging tanks. 10 An apparatus for high throughput preparation of a cement-based material using step-by-step dosing according to claim 4, wherein the apparatus further comprises cleaning devices, and the multi-channel device for raw materials, the feeding control device, the mixing device and the storage device are respectively connected to the cleaning devices.

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