Weighing and mixing machine contains weighing instrument, weighing module, frequency converter and field control box. And leave the communication interface with the upper computer. The material is conveyed into the mixer. The weight signal is sent to the weighing instrument. Weighing instrument will load the weight signal through the operation and processing of the material weight, respectively, in the weighing instrument display. Weighing instrument and frequency converter control the screw conveyor speed to form a closed loop control. The built-in intelligent software regulator of the weighing instrument can set high, medium and low feeding to ensure the accuracy of dosage. The output of three sets of signals is used to control the frequency converter, which in turn controls the feeding speed of the screw feeder, thus achieving the purpose of accurate dosage. The weighing meter can set the feeding quantity manually or set the proportion through the two-way communication between computer and meter.

Continuous Weighing mixer consists of two parts: hardware and software. Hardware part is mainly composed of mixing tank body, mixing tank cover, agitator, load-bearing weighing module, weighing instrument, transmission device, shaft sealing device and other programmable controllers, the upper industrial control computer system, etc.; according to the actual situation of the process, the two raw materials in the two raw materials before the delivery of the computer matching, according to the operator set the ratio of the two raw materials (i.e., the percentage) on the touch screen, the computer will automatically calculate the operating According to the proportion (i.e. percentage) of the two kinds of raw materials set by the operator on the touch screen, the computer will automatically calculate the running speed, and then according to the weight signals sensed by the two kinds of electronic scales, the computer will analyze the calculation at any time and control the adjusting speed so as to achieve the set proportion.

When the Transmission weighing and loading system feeds and weighs, due to the influence of the dropout, when the feeding is stopped, there is still a part of the material falling into the hopper scale in the air in a free-fall manner. In order to ensure the dosage accuracy, it is necessary to design a control algorithm for the termination of the feeding advance, to control the termination of the feeding advance, in order to minimize the impact of the fall on the dosage accuracy, so that the actual dosage value is kept within the error range. The algorithm takes advantage of the fact that the dosage production process is characterized by repeated weighing, and the results of the current weighing are used to correct the termination feed advance for the next dosage. After a limited number of trial dosages, it is possible to keep the static weighing value of the dosed material within the margin of error.

The design of the Suspended weighing and mixing machine is centered on the computer, and the operation process is also centered on the computer, and the process of feeding, temperature control, and discharging are all carried out by the sequential instructions issued by the computer. Each step of the operation process is carried out through the computer prompts and manual confirmation, the operation of the site with the computer system to carry out. Except for the operations that require manual cooperation, all other processes are automatically controlled by the computer system. The discharge rate of the weighing system affects the temperature of the mixing kettle and is controlled by detecting and regulating the flow rate. The control program automatically changes the feed flow rate according to the internal temperature rise rate to ensure that the internal temperature does not exceed the required range. At the same time, the jacket flow can be adjusted to stabilize the temperature in the dosing kettle.

The Reservation feeding system mixes different kinds of raw materials proportionally according to the pre-determined formula. It adopts microcomputer control technology and is mainly composed of pulverizer, elevator, fan, feeder and distributor. The dosing part includes silo, feeder, electronic scale and mixer. The main function of the dosing part is to put all kinds of different raw materials into the respective hopper after the feeding equipment, and then feed into the weighing hopper according to the given proportion of the formula and weigh, and then send it into the mixing machine for a certain period of time for stirring, and then mix evenly into the finished product.

The weighing bridge of Constant belt scale acts on the weighing sensor through a lever to send the weight of the material detected on the belt to the weighing instrument. At the same time, the speed signal of the belt conveyor by the velocity sensor is also sent to the weighing instrument. The instrument integrates the speed signal and the weighing signal to obtain the instantaneous flow and cumulative amount. The speed sensor is directly connected to the large diameter speed measuring drum and provides a series of pulses, each representing a belt movement unit, and the frequency of the pulse is proportional to the belt speed.

The weighing conveyor feeds the measured value as an input signal into a calculating device with multiplication and integration functions. The belt feed detector, integrated controller and drive unit, the coal charging detector, belt feed detector and drive unit are installed as parts of the feeder, the loading detection unit consists of a bearing roll and two weighing modules, two weighing modules measure the mass (gravity) of the precision weight table and transmit the signal to the integrated controller, and the signal of each sensor is consistent with the previous data. The signal of another sensor is compared, thus testing the effectiveness of the signal, if the signal is effective, the signal is multiplied by the correction factor to obtain the actual mass per unit length of the belt.

The distillation tank weighing system adopts a computer with stable performance to complete the data acquisition and communication processing, which is convenient to provide processing accuracy and cost reduction, and the data output and management are carried out through the COM communication interface of the computer itself; Mitsubishi F900 touch screen is chosen to replace the conventional weight indicator to do the human-machine interface, which makes the programming of the interface between PLC and weight indicator become simpler, and enables the display function to be enhanced. The weighing system is to add two or more kinds of materials to the mixing tank automatically according to a certain weight ratio, and then automatically discharges the materials after mixing to meet the predetermined requirements.

The weighing system of the reaction tank is transmitted to the central control room for centralized monitoring and management through high-speed network, and the host computer of the central control room also transmits control commands to the PLC measurement and control terminal through high-speed network to implement decentralized management of each unit. Integrating computer technology, automatic control, communication technology, weighing technology as a whole, its control function is perfect, display, operation is centralized, data processing is convenient, installation, maintenance is simple, the system is easy to expand.