Maintenance of common weighing faults of concrete batching machine

The concrete batching machine is an important part of the concrete mixing plant. Each electronic scale of the concrete batching machine weighing system is composed of a batching bin (scale body), a load cell, a junction box, a control instrument and a connecting line. Common preparations are in use The scale is unstable, drifting, linear out of tolerance and other faults, which affect the normal operation of the mixing plant.

The failure analysis of the concrete batching machine mainly includes the following aspects: The line failure is manifested as the controller display value overflows, the error message is displayed, and the signal is suddenly interrupted or jumped during weighing. The reasons are as follows.

One is the quality of the sensor itself. It shows that the sensor input and output resistance change. Under normal conditions, the input resistance of the sensor is 400Ω±10Ω, and the output resistance is 350Ω±3Ω. The main fault of the sensor is that the solder joints of the wiring terminals or lead wires fall off; the sensor zero temperature compensation or sensitivity temperature compensation resistance is soldered or unsoldered; the sensor is not well sealed and the internal chip is damp.

Second, the connection line between the sensor and the control instrument is broken. This kind of external fault is mainly caused by improper installation and use. If you use a multimeter to check the sensor input and output resistance, the resistance values are normal. The cause of the failure is: the connection wire is broken, causing a circuit break; the connection of the connection wire is loose or not soldered.

Abnormal zero point of concrete batching machine is also a common fault. One of the reasons is that the load cell is not temperature compensated. The zero point and sensitivity of the sensor change with the change of the ambient temperature, which leads to the failure of the zero point of the electronic scale. According to the international standard sensor production process, there is a temperature compensation process, which should be passed through the high and low temperature box. Analog sensors use environmental temperature changes to compensate, but many domestic sensor manufacturers do not have high and low temperature boxes at all, and cannot compensate the temperature of the sensor; the second reason is that the sensor is seriously overloaded, which causes the elastic body to produce plastic deformation and damage the sensor.

In addition, water in the junction box, moisture, oxidation or resistance breakdown may cause major failures.

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