Methods for accurate ratio of concrete mobile batching plant

To realize accurate matching of a concrete mobile batching plant, whether it is small or big, you should focus on three aspects: batching machine structure, human action and control units.

Reasonable structure of batching machine

In order to make the sensor stress uniform, the center of gravity of aggregate after entering the weighing hopper should be in a vertical line with the center of gravity of weighing hopper. In fact, the aggregate is not homogeneous material, and the error in the design and manufacture of the bucket itself makes the theoretical gravity center and the actual center of gravity not coincide, resulting in the uneven stress of the three sensors.

Even if the center of gravity of the hopper itself is not offset, but due to the deviation of the center of gravity of the aggregate in the feeding process, the weighing error will also occur. Therefore, the gravity center of the weighing hopper should not be offset, and the weighing hopper can move itself, so that the center of gravity of the aggregate and the center of gravity of the bucket are in the same line.

Human error correction

In the batching process, when the materials in the weighing hopper reach the set value, the feeding belt conveyor will automatically stop (the pneumatic feeding door is closed), but at this time, some materials still fall into the weighing hopper from the air, and the weight of this part of materials is called the drop. Most batching machines do not automatically correct the drop. In order to ensure the accuracy of batching, the drop value of materials is generally corrected by subtracting the set value from the set value.

In addition, when the weight of the weighing hopper reaches the initial setting value, the unloading is stopped. But in the actual production, the wet material will adhere to the weighing hopper, so the batching controller can not complete the unloading. Therefore, in production, an error is artificially added to the initial value to offset the weight of the adhesive. In production, the error setting value is generally reduced by adding a vibrator on the weighing hopper.

Configuration of reliable components in batching control system

Water and additives in a mobile concrete batching plant small are generally measured by flow meters. Due to the principle of measuring medium and pressure, the accuracy of measurement must be guaranteed under the condition of measuring medium and pressure. However, in practical application, these conditions are easy to fluctuate, which will lead to measurement error of flow meter.

Under the conditions of large temperature difference, dust and humidity, the sensitivity of the sensor will decrease. When the discharge gate of the weighing hopper is closed, there is aggregate in the hopper. The sensor with high sensitivity should be selected.

The core component of weighing control of a concrete mobile batching plant is batching controller, which will cause zero drift and affect measurement accuracy when power supply voltage is unstable. Therefore, it is necessary to ensure the stability of voltage and select the controller with fast a / D conversion rate to ensure the batching accuracy.