With the increase of weight, the cost of small automatic concrete mixer is bound to be higher and higher, the weight is smaller, and the quality of concrete can not be guaranteed. Therefore, don't relax the inspection and maintenance of symmetrical system at any time, so in daily situation, how should we deal with the weighing problem of small automatic concrete mixer?

一.小型搅拌机称重误差的根本原因

1、 The root cause of weighing error of small mixer

，我们需要找到一个不确定的来源，即称重传感器。称重传感器是一种电气元件，通过它我们可以测量我们需要的原材料的重量。

First, we need to find a source of uncertainty, the load cell. Load cell is an electrical component, through which we can measure the weight of raw materials we need.

在中小型搅拌机中，一般采用剪切梁称重传感器和S形张力称重传感器。在搅拌站中，集料、粉末和水的测量主要基于剪切梁称重传感器，而S形张力称重传感器主要用于外加剂的称重。

Shear beam load cell and S-shaped tension load cell are generally used in small and medium blenders. In the mixing plant, the measurement of aggregate, powder and water is mainly based on the shear beam load cell, while the S-shaped tension load cell is mainly used for the weighing of admixture.

二.小型搅拌机传感器常见故障原因及处理方法

2、 Common fault causes and treatment methods of small mixer sensor

1.小型搅拌机的未称重读数

1. Unweighted reading of small mixer

这种故障一般较为常见，称重值为零，无论以上是否存在，称重值始终为零。

This kind of fault is generally more common, the weighing value is zero, no matter whether the above exists or not, the weighing value is always zero.
             

主要原因及处理方法

Main causes and treatment methods

A，传感器损坏：当传感器上有原材料时，检测传感器输出信号线的电压值。如果两个值相同，传感器已经损坏，如果两个值之间有显著差异，则传感器正常工作。根据下图检测传感器的输出信号，不同企业传感器的工作原理和边界模式大致相同。下图显示了六线传感器的接线原理。

A. Sensor damage: when there are raw materials on the sensor, detect the voltage value of the sensor output signal line. If the two values are the same, the sensor is damaged. If there is a significant difference between the two values, the sensor works normally. According to the output signal of the sensor detected in the figure below, the working principle and boundary mode of different brands of sensors are roughly the same. The following figure shows the wiring principle of the six wire sensor.

B，线路上有一个短路：如果传感器没有损坏，下面的线路可以通过沿着感应线观察线路是否破损或被切断，来检查线路是否有破损的道路(安装一个小型搅拌机时)。

B. There is a short circuit on the line: if the sensor is not damaged, the following line can check whether there is a damaged road by observing whether the line is damaged or cut off along the induction line (when installing a small mixer).

C、信号发射机故障：了以上两个原因后，我们对信号发射机进行检查，其检测方法与传感器基本相同，以检测其输出信号是否有电压信号，当权重发生变化时，其值是否发生变化。

C. Signal transmitter fault: after eliminating the above two reasons, we check the signal transmitter, and the detection method is basically the same as that of the sensor to detect whether there is voltage signal in its output signal, and whether its value changes when the weight changes.

D，接线盒没有很好的接触：这主要是由于接线时电线头没有牢固连接所致。

D. The junction box is not well contacted: This is mainly due to the wire head is not firmly connected during wiring.

2.小型搅拌机的称重值上下波动。

2. The weighing value of small mixer fluctuates up and down.

这种现象表现在某一重量的重量值上下波动，超过正常的误差范围。

This phenomenon shows that the weight value of a certain weight fluctuates up and down, exceeding the normal error range.

主要原因是1.传感器附近的机械振动很大。2.在小型搅拌机(包括移动信号塔、超 高压变电所)附近有高频信号发射器。

The main reasons are as follows: 1. 2. There is a high frequency signal transmitter near the small mixer (including mobile signal tower and UHV substation).

加工方法a：如果传感器安装座附件的筒仓纯在较大的机械振动范围内，就会导致传感器的变形不断变化，因此测量的重量值会产生上下浮动的现象。

Processing method a: if the silo attached to the sensor mounting base is in a large mechanical vibration range, the deformation of the sensor will change constantly, so the measured weight value will float up and down.

处理方法b：对于小型简单搅拌机附近的信号干扰问题，施工中的车站应在施工开始时选择合理的站址，远离这些干扰源。

Treatment B: for the signal interference near the small simple mixer, the station under construction should choose a reasonable site at the beginning of construction, away from these interference sources.

小型搅拌机称重系统的维护

Maintenance of weighing system of small mixer

称重传感器属于精密电子元器件，需要远离灰尘、水等物质，必须保持传感器的清洁，因此，可以在传感器上增加一些防护罩。同时，称重系统需要每隔一段时间重新校准一次。

The load cell is a kind of precision electronic components, which needs to be kept away from dust, water and other substances. It is necessary to keep the sensor clean. Therefore, some protective covers can be added on the sensor. At the same time, the weighing system needs to be recalibrated at intervals.

在检查称重系统的故障时，我们可以使用方法将问题的根源降到小范围内。

When checking the fault of the weighing system, we can use the elimination method to reduce the root cause of the problem to a small range.