A method for continuous addition of multi-component materials

Abstract

This invention provides a method for continuous multi-component material addition, comprising the following steps: Step S1. Determining the materials to be premixed based on the characteristics of the continuously added materials; Step S2. Calculating the mixing ratio of the premixed materials according to their respective addition amounts per unit time; Step S3. Premixing the premixed materials, with each premixing amount being the amount required for each replenishment of the loss-in-weight scale; Step S4. Discharging the premixed material into the loss-in-weight scale, which then precisely feeds the premixed material according to the total continuous addition requirement. This invention premixes multiple materials beforehand and then adds the premixed material using a loss-in-weight scale. This allows materials that were originally added in smaller quantities to be added as a mixing carrier, increasing the amount of material added per unit time by the loss-in-weight scale, thereby improving the accuracy of the continuous addition amount by the loss-in-weight scale. Simultaneously, it reduces the number of continuous addition loss-in-weight scales required, lowering production investment costs.

Description

Technical Field

[0001] This invention relates to the field of solid powder mixing technology, and more particularly to a method for continuous addition of multi-component materials. Background Technology

[0002] When adding multi-component materials, in order to ensure the accuracy of continuous addition of each material, a separate continuous addition loss-in-weight scale is used for each material. The loss-in-weight scale ensures the accuracy of continuous addition of materials. However, when the continuous addition amount of materials is small, the addition accuracy of the continuous addition loss-in-weight scale is low. Summary of the Invention

[0003] The purpose of this invention is to overcome and supplement the shortcomings of existing technologies, and to provide a continuous method for adding multi-component materials. By using a premixing process, the amount of material added is increased, thereby improving the accuracy of the continuous addition of materials using a loss-in-weight weigher.

[0004] The technical solution adopted in this invention is:

[0005] A method for continuous addition of multi-component materials, comprising the following steps:

[0006] Step S1. Based on the characteristics of the continuously added materials, determine the materials to be premixed first. The material characteristics include the material density and the amount of material added per unit time. The material characteristics need to meet the following conditions: the density difference of the premixed materials is ≤5 times, and the difference in the amount of premixed materials added per unit time is ≤10 times.

[0007] Step S2. Calculate the mixing ratio of the premixed materials determined in step S1 according to their respective addition amounts per unit time: Material 1: Material 2: Material 3: Material 4: Material 5: … = A: B: C: D: E: …;

[0008] Step S3. Add the premixed materials from step S2 to the mixer for premixing. The amount of premixing each time is the amount required for each replenishment of the loss-in-weight scale.

[0009] Step S4. Discharge the premixed material into the loss-in-weight scale according to the loss-in-weight scale replenishment time. The loss-in-weight scale will continuously and accurately add the premixed material according to the total amount required for continuous addition.

[0010] Preferably, in the method for adding continuous multi-component materials, the premixed materials include at least two types.

[0011] Preferably, in the method for continuous addition of multi-component materials, the materials premixed in step S1 are all solid powders or granules.

[0012] Preferably, in the method for continuous addition of multi-component materials, the mixer speed in step S3 is 40-50 rpm, and the premixing time is 5-10 minutes.

[0013] Advantages of this invention:

[0014] The present invention provides a method for continuous multi-component material addition. Through a premixing process, materials that were originally added in small quantities can be added as a mixing carrier, increasing the amount of material added per unit time of the loss-in-weight scale, thereby improving the accuracy of the addition amount of the continuous addition loss-in-weight scale. The premixing process also reduces the number of continuous addition loss-in-weight scales used, thereby reducing production investment costs. Attached Figure Description

[0015] Figure 1 This is a process flow diagram for the continuous addition of multi-component materials according to the present invention.

[0016] Figure 2 This is a process flow diagram of Embodiment 1 of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments.

[0018] Example 1

[0019] like Figure 2 The method for continuous addition of multi-component materials in this embodiment includes the following steps:

[0020] Step S1. Based on the characteristics of the continuously added materials, determine the materials to be premixed first. The material characteristics include material density and the amount of material added per unit time. The material characteristics need to meet the following conditions: the density difference of the premixed materials is ≤5 times, and the difference in the amount of material added per unit time is ≤10 times; Material 1: bran (density: 200g / L, continuous addition amount of 10kg every 20 minutes), Material 2: protein powder (density: 500g / L, continuous addition amount of 1kg every 20 minutes); Continuous addition loss-in-weight scale, continuous addition amount of 11kg±25g every 20 minutes (addition accuracy is 0.227%), of which bran (10kg) and protein powder (1kg) have a feeding speed of 0.55kg / min, and 11kg of material needs to be added every 20 minutes;

[0021] Step S2. Calculate the mixing ratio based on the amount of each material added per unit time, as determined in Step S1 for premixing. Every 20 minutes, the amount of bran added (10 kg) and the amount of protein powder added (1 kg) are calculated. The difference in the amount added per unit time between the materials is (10 / 1 = 10 times), and the difference in density between the two materials is (500 / 200 = 2.5 times). Both the difference in the amount added and the difference in density per unit time meet the material characteristic requirements. Mixing ratio = Bran addition over 20 minutes : Protein powder addition over 20 minutes = 10 kg : 1 kg = 10 : 1.

[0022] Step S3. Add the premixed materials from Step S2 to the mixer for premixing. The amount of premixed materials each time is the amount required for each replenishment of the loss-in-weight scale. Using a metering tank, add 10 kg of bran and 1 kg of protein powder into the mixer to complete the premixing, obtaining 11 kg of premixed material. The mixer speed is 50 rpm, and the premixing time is 5 minutes. After premixing, a sample was taken and the mixing uniformity CV% value of the mixture was measured to be 2.86%, which meets the premixing technical standard CV < 5%.

[0023] Step S4. During the feeding period of the loss-in-weight scale, the premix (11kg) is directly fed into the loss-in-weight scale from the mixer outlet. After the mixer completes the feeding, the premixing of materials is repeated. The loss-in-weight scale is continuously added, and the premix material (11kg±25g, feeding accuracy of 0.227%) is continuously added every 20 minutes. The feeding speed meets the requirement of 0.55kg / min.

[0024] Mixing uniformity test: Ten samples were taken from various parts of the mixer using an insertion sampler, each weighing 110g. The protein content was then determined using a Kjeldahl nitrogen analyzer. The average protein content of the ten samples was calculated (10.04%). The test results are shown in Table 1, with a standard deviation of (0.288). The calculated CV% value of the mixed sample was: (standard deviation * 100%) / average value = (0.288 * 100%) / 10.04 = 2.86%.

[0025] The mixing ratio is 10:1. For a 110g sample, the theoretical protein powder content is 10g, and the average value of the sample test is 10.04g, with a deviation of 0.04g. The deviation per 1kg is 4g. The theoretical bran content is 100g, and the average value of the sample test is 99.96g, with a deviation of 0.04g. The deviation per 10kg is 4g.

[0026] Table 1. Detection Data Table for Example 1

[0027]

[0028] Example 1 can ensure that the addition accuracy of the loss-in-weight premix is ​​11kg ± 25g (i.e., 0.227%).

[0029] Table 2. Theoretical Calculation of Continuous Addition Accuracy of Various Materials in Loss-in-Weight Scale in Example 1.

[0030] materials Added amount accuracy bran 10kg ±22.7g protein powder 1kg ±2.27g Total Mixture 11kg ±25g

[0031] Table 3 shows the calculation of the continuous addition accuracy of each material in Example 1, taking into account the mixing uniformity of the mixer.

[0032] materials Added amount Loss-in-weight scale accuracy Mixing uniformity accuracy Cumulative accuracy deviation bran 10kg ±22.7g ±4g ±26.7g protein powder 1kg ±2.27g ±4g ±6.27g Total Mixture 11kg ±25g

[0033] Comparative Example 1

[0034] Two main ingredients are added continuously and precisely: wheat bran (density: 200g / L, 10kg added every 20 minutes) and protein powder (density: 500g / L, 1kg added every 20 minutes). A loss-in-weight weigher is used for continuous addition, adding wheat bran (10kg±25g, addition accuracy 0.25%) every 20 minutes at a rate of 0.5kg / min, requiring a replenishment of 10kg every 20 minutes; a loss-in-weight weigher is also used for continuous addition, adding protein powder (1kg±25g, addition accuracy 2.5%) every 20 minutes at a rate of 0.05kg / min, requiring a replenishment of 1kg every 20 minutes.

[0035] In Comparative Example 1, the amount of protein powder added every 20 minutes was only 1 kg, and the accuracy of the loss-in-weight weighing was <10 kg ± 25 g. At this time, the accuracy of protein powder addition was only 1 kg ± 25 g (i.e., 2.5%), which is very poor and cannot meet the customer's needs.

[0036] Table 4. Comparison of continuous addition accuracy between Example 1 and Comparative Example 1

[0037] materials Added amount Cumulative accuracy deviation in the example Comparison of scale accuracy deviation bran 10kg ±26.7g(0.267％) ±25g(0.25％) protein powder 1kg ±6.27g(0.627％) ±25g(2.5％)

[0038] As can be seen from Example 1, the process of premixing before adding can significantly improve the addition accuracy of materials with small continuous addition amounts (protein powder). The accuracy in Example 1 is 1kg±6.27g, and in Comparative Example 1 it is 1kg±25g, which is nearly 4 times higher. The addition accuracy of materials with large continuous addition amounts (wheat bran) has little impact. The accuracy in Example 1 is 10kg±26.7g, and in Comparative Example 1 it is 10kg±25g.

[0039] In Comparative Example 1, Material 1 (wheat bran) was continuously added at a rate of 10 kg every 20 minutes, with an addition rate of 0.5 kg per minute; Material 2 (protein powder) was continuously added at a rate of 1 kg every 20 minutes, with an addition rate of 0.05 kg per minute. According to the original technical solution, two loss-in-weight scales were required. The continuous addition accuracy of the loss-in-weight scale for Material 1 (wheat bran) was 10 kg ± 25 g (0.25%), and the continuous addition accuracy of the loss-in-weight scale for Material 2 (protein powder) was 1 kg ± 25 g (2.5%).

[0040] In Example 1, material 1 (wheat bran) and material 2 (protein powder) were premixed according to the specified ratio, resulting in a premixed material volume of 11 kg. After mixing, continuous feeding could be completed using only one loss-in-weight feeder. The continuous feeding rate of the loss-in-weight feeder was increased to 11 kg every 20 minutes, i.e., 0.55 kg / min, with a continuous feeding accuracy of 11 kg ± 25 g (0.227%).

[0041] In Comparative Example 1, the amount of material 2 added was too small (only 1 kg). If an accuracy requirement of 0.25% is required, the loss-in-weight scale must be accurate to 1 kg ± 2.5 g. Currently, there are basically no continuously added loss-in-weight scales that can meet this requirement.

[0042] Example 1 involves premixing the material before continuously adding it. This method allows existing continuous addition loss-in-weight scales to meet the accuracy requirements, thus solving the problem of not being able to continuously and accurately add material 2 (protein powder). Furthermore, a small mixer can replace a loss-in-weight scale (and if multiple materials are premixed, multiple scales can be saved). Since the cost of a small mixer is much lower than that of a loss-in-weight scale, the total equipment investment can be significantly reduced.

[0043] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for continuous addition of multi-component materials, characterized in that: Includes the following steps: Step S1. Based on the characteristics of the continuously added materials, determine the materials to be premixed first. The material characteristics include the material density and the amount of material added per unit time. The material characteristics need to meet the following conditions: the density difference of the premixed materials is ≤5 times, and the difference in the amount of premixed materials added per unit time is ≤10 times. Step S2. Calculate the mixing ratio of the premixed materials determined in Step S1 according to their respective addition amounts per unit time: Material 1: Material 2: Material 3: Material 4: Material 5: ... = A: B: C: D: E: ... Step S3. Add the premixed materials from step S2 to the mixer for premixing. The amount of premixing each time is the amount required for each replenishment of the loss-in-weight scale. Step S4. Discharge the premixed material into the loss-in-weight scale according to the loss-in-weight scale replenishment time. The loss-in-weight scale will continuously and accurately add the premixed material according to the total amount required for continuous addition.

2. The method for continuous addition of multi-component materials as described in claim 1, characterized in that: The premixed materials in step S1 include at least two types.

3. The method for continuous addition of multi-component materials as described in claim 1, characterized in that: The materials premixed in step S1 are all solid powders or granules.

4. The method for continuous addition of multi-component materials as described in claim 1, characterized in that: In step S3, the mixer speed is 40~50 rpm and the premixing time is 5~10 minutes.

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