The weighing control system is one of the most important parts of asphalt mixing plant. Here are some operation points of weighing comtrol system:

1. Turn on the Power 

Before the power is turned on, the DC24V air switch should be closed (this air switch can be turned off after the power is turned off), and then the status of the “POWER CONTROL” (start switch) is turned to the “ON” state. At this time, observe whether the “POWER” (red indicator) on the inspection panel is lit. If it is lit, it indicates that the control system power has been turned on. Wait for about 1min to check whether the touch screen is displayed normally. If the display is normal, the power supply is normal. Otherwise, it should be repaired.

2. Routine Inspection

Routine inspections are a must before normal production begins. The routine inspection of the weighing system is as follows:

In the default “stirring screen” of the touch screen, the operator must first check the system status, whether the system is in the “single step” state or the “continuous” state. A running state must be given before the ingredients, and the system is silently "non-" when starting up, and cannot be automatically or semi-automatically compounded.

Check that the “target weight” and “corrected weight” settings of all measurement contents are correct and that the “real-time value” is beating normally, and check whether the metering bin door and the mixer cylinder discharge door status indication are all off.

Check that the “Tare Alarm Limit” in each sub screen is within the normal range, and check whether the gross weight, net weight, and tare weight in each sub screen are normal. Also check whether there is an intermediate status display in each sub-picture, and check whether the various parameters in the "Parameter Setting" screen are normal. If you find the problem, you must solve it in time.

Before feeding, first start the aggregate bin door, the metering bin door, the mixing tank discharge door, and the overflow waste door to check whether the action is normal.

Check whether the operation of each travel switch is normal, especially the metering bin door and the stirring cylinder discharge door travel switch. Only when the above checks are normal can the machine be turned on, otherwise the cause must be ascertained.

3. Ingredients

When dosing, you must wait for the corresponding aggregate bin of the required material to have a low level signal before starting the batching. In the case of the first 3 pots, single-step batching control should be used. There are two reasons for this: one is to check whether the supply of each material is normal, and the other is to allow the operator to have sufficient time to make corrections symmetrically.

When there is no material in each measuring bin or mixing tank, the system is switched to continuous batching control, and the operator only needs to monitor the change of the result weight, correction weight, real-time value, etc. in the stirring screen.

If an abnormal condition is found in the ingredients, the operator should immediately press the “EMER STOP” button to forcefully close all the feed bin doors. To ensure that the door control buttons on the console are functioning properly, the corresponding door should open as soon as the operator clicks. However, in the interlock state, if the metering bin door is not closed, the feeding bin door will not open; if the mixing cylinder discharging door is not closed, the metering bin doors will not open.

If the system software is abnormal during the batching process, the operator has two ways to restart: first, turn off the system power and restart the system; second, click the “emergency reset” button to return the system to normal.

4. Discharge

In the single-step operation state, if the operator does not click the "timer" button, the mixer cylinder discharge door will not open automatically. Click the “Timer” button. After the wet mix countdown returns to zero, the mixer cylinder discharge door can be opened automatically. In the continuous running state, when all the materials in the measuring chamber are triggered, the counting time starts to count down the wet mixing time. If the truck is in place after the wet mixing time is zero, the mixing cylinder discharging door will automatically open. If the truck is not in place, the mixer cylinder discharge door will never open automatically.

After the operator clicks the button of the mixer cylinder discharge door, the mixer cylinder discharge door should be opened at any time to prevent the power line from tripping due to excessive accumulation of material in the mixing cylinder.