The mixing system adopts human-computer interaction and management functions, with the ability to process information in Chinese, and adopts Chinese prompts in the menu mode. The operator can select and perform various operations by function Casgood or cursor movement. The system provides a fixed recipe library. There are as many as 100 kinds of formulas. The operator can query, modify or assign a working formula to the stored formula, or temporarily input and erase a formula. The system has dynamic display and printing functions. In the process of dosage, the computer can display the dosage control flow chart on the CRT screen and indicate dynamically with the cursor, which can display the title and dosage weight at the same time, etc., so that the operator can understand the dosage situation at a glance. The printer can print in Chinese. The system can provide various production information reports to the production management department.
020-34563445Feeding system adopts human-computer interaction and management function, with Chinese information processing capability, adopting Chinese prompts in menu mode. The operator can select and execute various operations by function Casgood or cursor movement. The system provides a fixed recipe library. There are as many as 100 kinds of formulas. The operator can query, modify or assign a working formula to the stored formula, and can also input and erase a formula temporarily. The system has dynamic display and printing functions. In the process of dosage, the computer can display the dosage control flow chart on the CRT screen and indicate dynamically with the cursor, which can display the title and dosage weight at the same time, etc., so that the operator can understand the dosage situation at a glance. The printer can print in Chinese. The system can provide various production information reports to the production management department.
In order to make the PLC complete the function of dosage control, the PLC needs to have the functions of weight signal input, weight signal processing, processing results output and so on. The following is a description of the PLC program to complete the dosage steps:
1. the weight signals of the two batching machines enter the PLC through weighing instrument and A/D conversion respectively. the output of the weighing instrument is parallel BCD code, which is converted into binary code through the program and stored in the data register of the PLC.
2. According to the requirements of the dosage process, the dosage process of all the raw materials includes a pointing process to ensure the accuracy of the dosage. The operator of the dosage enters the recipe of the raw material, which includes the feeding quantity, the advance and the precision of the various raw materials, and their relationship with the dosage process is: when the weight of the raw material < (feeding quantity - advance), the dosage is added. After the feeding stops, PLC compares the weight of raw material with the feeding amount, and it is qualified within the tolerance. At the lower limit of tolerance, it should be dosed on demand, and greater than the upper limit of tolerance is exceeding the tolerance.
3. As the mixer is used in the cumulative scale, that is, by a scale in order to add several raw materials, so that in addition to the first raw materials, the weight is the sum of several raw materials. In the PLC program to separate the weight of several raw materials, the weight of each raw material, the program is handled in this way: in each raw material weighing, write down the weight at this time, weighing with the total weight minus the weight of the previously written down, resulting in the actual weight of such raw materials.
4. Scale body adhering to the raw material to make the dosage deviation, need to be tare processing. Peeling method is similar to the above method, that is, press the "peeling" key, the PLC records the weight at this time, the weight that is the reference zero. In the weighing of the total weight minus the zero point of the benchmark value, the accurate weight of raw materials.
5. After the feeding stops, the screw Feeder to the hopper scale between the part of the raw material to fall into the hopper scale, in order to make the dosage accuracy to meet the requirements of the program needs to take into account the weight of the program with the "advance" on behalf of the value, when the weight of the raw material reaches the (amount of feed - the amount of advance) to stop the feeding by the raw material left in the air to supplement the difference in the amount of advance, so as to reach the exact weight of raw materials. Supplement the difference of the advance amount, so as to achieve the accuracy requirements.
6. Considering the possibility of a sudden power failure caused by the dosage stop, in order not to waste the raw materials that have been prepared, the weight of the raw materials that have been prepared need to have a power failure protection function. In the program, these weight signals are stored in the data registers which can be kept in power failure.
