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.小型攪拌機稱重誤差的根本原因

1、 The root cause of weighing error of small mixer

，我們需要找到一個不確定的來源，即稱重傳感器。稱重傳感器是一種電氣元件，通過它我們可以測量我們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.

在中小型攪拌機中，一般采用剪切梁稱重傳感器和S形張力稱重傳感器。在攪拌站中，集料、粉末和水的測量主要基于剪切梁稱重傳感器，而S形張力稱重傳感器主要用于外加劑的稱重。

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.小型攪拌機傳感器常見故障原因及處理方法

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

1.小型攪拌機的未稱重讀數(shù)

1. Unweighted reading of small mixer

這種故障一般較為常見，稱重值為零，無論以上是否存在，稱重值始終為零。

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.
             

主要原因及處理方法

Main causes and treatment methods

A，傳感器損壞：當傳感器上有原材料時，檢測傳感器輸出信號線的電壓值。如果兩個值相同，傳感器已經(jīng)損壞，如果兩個值之間有顯著差異，則傳感器正常工作。根據(jù)下圖檢測傳感器的輸出信號，不同企業(yè)傳感器的工作原理和邊界模式大致相同。下圖顯示了六線傳感器的接線原理。

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，線路上有一個短路：如果傳感器沒有損壞，下面的線路可以通過沿著感應線觀察線路是否破損或被切斷，來檢查線路是否有破損的道路(安裝一個小型攪拌機時)。

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、信號發(fā)射機故障：了以上兩個原因后，我們對信號發(fā)射機進行檢查，其檢測方法與傳感器基本相同，以檢測其輸出信號是否有電壓信號，當權重發(fā)生變化時，其值是否發(fā)生變化。

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，接線盒沒有很好的接觸：這主要是由于接線時電線頭沒有牢固連接所致。

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

2.小型攪拌機的稱重值上下波動。

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

這種現(xiàn)象表現(xiàn)在某一重量的重量值上下波動，超過正常的誤差范圍。

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.傳感器附近的機械振動很大。2.在小型攪拌機(包括移動信號塔、超 高壓變電所)附近有高頻信號發(fā)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：如果傳感器安裝座附件的筒倉純在較大的機械振動范圍內(nèi)，就會導致傳感器的變形不斷變化，因此測量的重量值會產(chǎn)生上下浮動的現(xiàn)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.

處理方法b：對于小型簡單攪拌機附近的信號干擾問題，施工中的車站應在施工開始時選擇合理的站址，遠離這些干擾源。

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.

小型攪拌機稱重系統(tǒng)的維護

Maintenance of weighing system of small mixer

稱重傳感器屬于精密電子元器件，需要遠離灰塵、水等物質，必須保持傳感器的清潔，因此，可以在傳感器上增加一些防護罩。同時，稱重系統(tǒng)需要每隔一段時間重新校準一次。

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.

在檢查稱重系統(tǒng)的故障時，我們可以使用方法將問題的根源降到小范圍內(nèi)。

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.