As poultry livestock are generally produced on a captive scale, the demand for finished feed is increasing, and the production scale of compound feed is also increased from 2t/h to 20t/h, 30t/h or even more. The raw materials for the production of compound feed are mainly corn, wheat bran, fishmeal, soybean meal, additives and animal drugs. In the short-term production, various raw materials should be put into the weighing bucket according to the quality specified by the formula, and then enter the mixer process. It is difficult to achieve fast and accurate by manpower, so it is more and more important to adopt intelligent automatic batch weighing system in feed production. There are two modes for weighing feed ingredients: The first is to use a weighing bucket to order 12 to 16 feed ingredients; The second is to use 8 measuring buckets to sequentially weigh 8 to 12 kinds of feed ingredients, and directly discharge them in a mixer. The production formula and the number of raw materials used in each production plant are different, but the production mode and process are similar, and the weighing methods are basically the same. The process production process is generally to use the bucket elevator to raise the raw materials to the high screw conveyor at the factory. The electronically controlled rotary distributor is distributed to each storage bin located at the upper level of the factory. Under the instruction of the batching controller, the screw conveyors for each storage silo are sequentially discharged to the measuring bucket according to the set amount, when pressed After the formula is specified with the complete material, the measuring bucket automatically opens the discharge door and sends the mixed ingredients to the mixer for mixing. At the same time, the required oil is added, and the mixture is sent to the next process such as press molding. The measuring bucket has a capacity of generally 800KG to 1200KG, and generally adopts an inverted cone bucket structure. In order to prevent the metering bucket from swinging due to material escaping, it is preferable to use a pressure type load cell. Since the measured materials are mostly loose powder raw materials, when the raw materials enter the measuring bucket, they will inevitably accumulate into a mountain-shaped hillock. Therefore, the volume design of the measuring bucket must be multiplied by a coefficient so that it can fully accommodate the rated quality raw materials. The coefficient can be set to 1.3 to 1.4 depending on the density and particle size of the raw material. The taper of the discharge port of the measuring bucket is the key part to ensure the free and rapid drop of the raw material. If the design is improper, the dry material may form a self-supporting arch in the taper under the action of gravity, which is arched or rat-shaped. See figure or funnel shape, affecting the normal flow rate of the raw material and the cleanness of the drop, which will cause difficulties for one-time accurate measurement, so it should be eliminated during design. According to theoretical calculations and practical experience, this cone angle generally requires less than 60 degrees. . In order to achieve the best state of the measuring bucket during operation, prevent the moisture absorption material from accumulating on the inner wall and affect the measurement accuracy and the discharge speed, the wall vibrator can be added on the outside of the measuring bucket wall to force the vibration and destroy the blocked state. The can be set at the upper end of the discharge port Set the triangle to break the arch structure. Above the measuring bucket, there are 12 to 16 kinds of raw material screw conveyor feeding ports, the unit density is very high, and the reasonable uniform distribution of each feeding position is very important for fast and accurate metering. It is beneficial to the production and easy to overhaul. In order to facilitate the timing calibration of the measuring bucket, a steel mesh frame can be welded on the outer side of the measuring bucket, or a hook can be welded 90 degrees apart along the circumference, so as to place or hang the weight at the time of calibration. The programmable controller PLC is used in the logic control circuit to reduce the size of the control cabinet and reduce the number of electrical appliances such as relays. Since the logic control circuit is input into the CPU of the PLC in a ladder language to make debugging more convenient, once the control circuit is partially changed, it is only necessary to rewrite the language, and it is not necessary to replace a lot of hardware. Therefore, it is practical to directly connect the output control contact with the PLC. In addition, it has a relatively complete report printing function, can print systematic data reports, operational data reports (boot date, time, stop time), material consumption report, recipe production report, ingredient report raw material number, quality, tolerance . It can be seen that its various compounding functions, control functions and report printing functions can fully meet the needs of automated production of modern feed mills. Shangqiu Jinda Tools Co.,Ltd , https://www.jindameasur.com
Automatic batch weighing system in feed production