The key factors influencing the material dosing accuracy of feed machine

1.1Central control system
In feed production, there is frequently a discrepancy between the production volume counted by the computer console and the actual production volume of the packaged finished product. This is mainly caused by the fact that the computer console counts the production under the feeding error and does not include the weighing error.In addition, errors in quantitative packaging weighing, losses in material processing, changes in moisture content, and failure to account for the weight of added liquids have some influence.When analyzing the material dosage error, the weighing error of the material dosage scale should not be ignored, even if the dosage display error is zero, it is also the zero error under the premise of the existence of weighing error, rather than the real zero error. Only weighing error is small, the material dosage error will be small. But the material dosage error is no longer small, but also can not be equal to or less than the weighing error.Controlling the weighing error is the basis of controlling the dosage error, and it is possible to obtain satisfactory dosage accuracy only if the dosage scale is kept in good working condition through regular "calibration" operation.
Improve the feeding performance of the feeder, through the volume and quality characteristics of different raw materials, reasonable setting of fast and slow feeding operation and the choice of dosage bin motor, reduce the material drop difference. Batching motor through the frequency converter to implement fast and slow secondary feeding is a better solution.
Adoption of "single (species) weighing accuracy" as the control objective of the computer central control software, in order to improve the adaptive compensation function, effective control of the accuracy of single species weighing.
The adoption of computer-controlled dosage scales produced by well-known manufacturers, complying with national standards, stability and repeatability, and with calibration/inspection certificates can improve the anti-interference ability of the dosage system and the external environmental conditions of the dosage scales.
Attention to the effective grounding of the dosage electronic scale. There have been a lot of cases proving that a lot of static electricity will be generated in the process of the material going down to the dosage scale, if there is no effective grounding operation, it will lead to a lot of static electricity being conducted from the dosage scale to the central control system, resulting in the breakdown of the weighing microcomputer chip or loss of accuracy.

1.2 Selection of suitable processing technology
1.2.1 Ingredients first and then crushing and mixing process
This process is characterized by the selection of multi-feed multi-scale batch mixing process, suitable for livestock and poultry feed production. The proportion of ingredients is in order according to the ratios:＞20%、5%～20%、1%～5%和＜1%, The material dosing cycle is 1/3 shorter than the conventional process, and it adopts the pre-graded open-circuit crushing process to improve the crushing efficiency and speed. Since the material dosing and weighing is weighed feed ingredients, the accuracy is average for raw materials with high mass specific gravity ( Figure.1).

 1.2.2 Crushing then batching then mixing process
The secondary crushing, dosing and mixing process is a commonly used process in aqua-feed production, especially in shrimp feed production. Its process is characterized by the first crushing, dosing and mixing for primary processing, the second for ultra-fine grinding, measuring and supplementary dosing, and finally mixing. The secondary dosage applies to the first dosage ingredients and meet the particle size requirements of the raw materials with the reduction of repeated crushing; secondary mixing is suitable for liquid raw materials and micro-ingredients, mixing speed is fast, the process is flexible, the process as long as the adjustment in the grinding capacity, there is the potential to expand the production capacity, the dosage precision is excellent (Figure 3).