Explosion-proof batching machine includes many kinds of equipments such as raw material storage, conveying, weighing and batching, dust removing, material mixing, packing and filling, etc. It involves a variety of materials such as powder, granule, block, flake and liquid, etc.; according to the characteristics of the industry and the requirements of the process, combined with the characteristics of the materials, it can reasonably choose a single material dosing, multi-materials sequential totalizing, weight loss dosing, loss-in-weight weighing dosing, screw/spiral weighing and bulk weighing and other kinds of metering modes.

Batching system consists of a set of PLC system and a set of upper computer monitoring system, PLC system by the Shuoren era STEC series controller and instrumentation and communication cable, STEC controller with Ethernet communication, the controller also provides RS232, RS485 interface and ADSL, GPRS, CDMA, fiber optic and other communications, the upper computer monitoring system using Windows The upper computer monitoring system adopts Windows operating system and installs SRDev2.0 programming software and HOMS5.0 configuration software. Real-time monitoring of the whole Dosage system, screen display and report printing; PLC: realize the automatic control of dosage.

This system adopts sequential start, sequential stop, emergency stop and simultaneous start. When it is manual, the change-over switches of the field control box and the instrument box are played to the manual position, and the control is realized by the start-stop buttons, potentiometers and frequency meters on the field control box, and the instantaneous and cumulative quantities of materials are displayed by the weighing instrument. Mainly used for network system failure PLC control dosage failure or other reasons, the need for manual overhaul of the trial operation of the emergency operation of the work situation. Semi-automatic when the field control box and instrumentation box switch to the automatic position, by the field control box on the start-stop button, frequency meter, weighing instrument to achieve control, can be set through the weighing instrument formula to automatically adjust the amount of batching, display the instantaneous amount of material and the cumulative amount of material; but also through the site of the operating screen, set the formula to mix the amount of material. It is mainly used to realize on-site operation when no upper position control is needed. When it is fully automatic, the conversion switch of the instrument box will be played to the linkage position, and the upper computer will control the starting and stopping of the screw, and dynamically display the amount of each material, the operation status, and all kinds of alarm indications, and the amount of each ingredient will be uniformly set by the upper computer according to the requirements of the process, and the weighing signals and the switching status of each ingredient control circuit can be collected and processed, so that it can realize automatic control of the whole ingredient system such as the feeding, weighing and detection, the material adjustment, and the choice of the material bins and the switching. Automatic control of the batching process. At this time, the manual control of the dosage system on site does not work, and it is operated completely through the central control room.

Sequential start is used for the initial start of the dosage or the restart of the dosage system after a sequential stop. The sequential start function controls the starting of the dosage feeding equipment according to the running direction of the screws at certain time intervals in order to ensure that the material heads can be aligned. Sequential stop: this is used when a long stop is desired, so as to ensure that the material on the conveyor screw is transported cleanly, so that the screw is in a material state, and to ensure that the ends of the material are aligned. Emergency stop is used in the event of an emergency when all the equipment involved in the dosage stops immediately. Simultaneous start is used for restarting after an emergency stop, which enables the dosage system to continue to run at the previous "break point", as if nothing had happened. (Note: the four buttons cannot be clicked randomly and without order, they must be operated according to the operating requirements).

When the required proportion of a certain amount of material is determined, it is entered as a set value into the upper computer and transmitted to the weighing instrument through the network. The material falls on the weighing spiral, its weight is detected by the load cell, the feedback voltage signal of material flow (measured value) is obtained to the weighing control instrument and operated to become the current value of PV, and then the 4-20mA control signal is output to the frequency converter through the PID operation to change the output value of U/F, so that it can change the speed of the spiral to control the size of the material quantity and realize the automatic dosage. Control of material proportioning: The dosage system is mainly controlled by the proportioning input and calculation from the upper computer, i.e. the process parameters of all kinds of raw materials are input into the computer, and the computer directly coordinates the setting and proportioning of each kind of materials. When there is a problem with the upper computer, automatic control can be realized through the operating screen on site.

Main functions of the solution

Monitoring function: detection and monitoring of the instantaneous flow, daily, monthly and yearly totalization of the dosage process in the spiral weigher;

Screen display: through the computer monitor it is possible to display the operating status of the control parameters involved in the dosage process, as well as displaying real-time dosage curves and tables;

Printing management: dosage reports can be printed at any time for storage and inquiry;

Communication function: two-way data and information exchange can be carried out between the industrial control machine, PLC and meters;

Data processing: the system can automatically operate and process the collected signals and output to the corresponding control quantity;

Control function: according to the corresponding set value before operation, automatically control the normal operation of the equipment, including PID adjustment;

Alarm function: the upper computer alarms various parameters exceeding the limit or abnormal equipment status by means of screen and sound and light signals.