在搅拌机维修过程中，我们经常会遇到许多疑难故障，特别是搅拌机的电路故障。有时我们没有办法开始。我们不知道故障在哪里，更不用说快速排除故障了。下面就教你几个搅拌机电路故障排除方法。

In the process of mixer maintenance, we often encounter many difficult faults, especially the circuit fault of the mixer. Sometimes we can't get started. We don't know where the trouble is, let alone remove it quickly. Here are some troubleshooting methods for mixer circuit.

直观的诊断方法

Intuitive diagnostic methods

当特种车的电路发生故障时，有时会出现冒烟、火花、异响、烧焦、发热等异常现象。这些现象可以直接观察，从而判断故障位置。

When the circuit of a special vehicle breaks down, some abnormal phenomena such as smoke, sparks, abnormal noise, scorching and heating may occur. These phenomena can be directly observed to determine the fault location.

开路法

Open circuit method

当搅拌机的电路设备发生接地故障时，可用开路法进行判断。断开怀疑有接地故障的电路段后，观察电气设备中是否仍存在接地故障，以判断电路接地故障的位置和原因。

In case of grounding fault of mixer circuit equipment, open circuit method can be used for judgment. After disconnecting the circuit section suspected of having a ground fault, observe whether there is still a ground fault in the electrical equipment to determine the location and cause of the circuit ground fault.

短路方法

Short circuit method

如果搅拌机电路存在开路故障，也可采用短路法判断，即用驾驶员或导线对怀疑存在开路故障的电路短路，观察仪表指针的变化或电气设备的工作情况，判断电路是否存在开路故障。

If there is an open circuit fault in the mixer circuit, the short circuit method can also be used to judge, that is, use the driver or wire to short circuit the circuit suspected of having an open circuit fault, observe the change of the instrument pointer or the working condition of the electrical equipment, and judge whether there is an open circuit fault in the circuit.

测试灯法

Test lamp method

测试灯法是用车辆灯泡作为测试灯，检查电路中是否存在开路故障。

The test lamp method uses the vehicle bulb as a test lamp to check whether there is an open circuit fault in the circuit.

仪表方法

Instrumentation method

观察搅拌机仪表板上的电流表、水温表、燃油表、油压表的指示，判断电路是否有故障。例如，当发动机处于冷态且点火开关打开时，水温表的满刻度位置不移动，表明水温表传感器有故障或电路接地。

Observe the indications of ammeter, water temperature gauge, fuel gauge and oil pressure gauge on the instrument panel of the mixer to judge whether the circuit is faulty. For example, when the engine is cold and the ignition switch is on, the full scale position of the water temperature gauge does not move, indicating that the water temperature gauge sensor is faulty or the circuit is grounded.

低压接地着火试验方法：将电气设备的一根电线端部拆下，试验货车金属部分是否产生火花。这种方法相对简单，经常被搅拌机电工使用。接地测试有两种方法：直接接地测试和间接接地测试。特别是在电子线路车上不能采用耐火试验方法。

Low voltage grounding fire test method: remove the end of a wire of electrical equipment and test whether the metal part of the truck produces sparks. This method is relatively simple and is often used by mixer electricians. There are two methods of grounding test: direct grounding test and indirect grounding test. In particular, the fire resistance test method cannot be used on electronic circuit vehicles.

直接接地方式：空载直接接地产生强火花。例如，如果要判断点火线圈与蓄电池之间的电路是否有故障，可以将点火线圈上连接点火开关的电线端拆下，在车身或车架上划伤。如果有强烈的火花，说明电路正常；如果没有火花，说明电路开路。

Direct grounding mode: no-load direct grounding produces strong sparks. For example, if you want to judge whether there is a fault in the circuit between the ignition coil and the battery, you can remove the wire end connecting the ignition switch on the ignition coil and scratch the body or frame. If there is a strong spark, the circuit is normal; If there is no spark, the circuit is open.

间接接地法：通过混凝土搅拌机电器对某一负载接地产生微弱火花，判断电路或负载是否存在故障。例如，传统点火系统断路器的连接线接地，如果有火花，说明电路正常；如果没有火花，说明电路开路。

Indirect grounding method: a weak spark is generated by the concrete mixer electrical appliance to ground a load to judge whether there is a fault in the circuit or load. For example, the connecting line of the circuit breaker of the traditional ignition system is grounded. If there is spark, the circuit is normal; If there is no spark, the circuit is open.

高压着火试验方法

High pressure ignition test method

将着火试验的高压电路接地，观察电火花情况，判断点火系统的工作状态。具体方法是：取下点火线圈或火花塞的高压线，对准火花塞或气缸盖，距离约5mm，然后打开起动开关，转动发动机，看到点火跳动。如果火花很强，天蓝色，跳火的声音很大，说明点火系统工作正常；否则，说明点火系统工作不正常。

Ground the high-voltage circuit of the ignition test, observe the electric spark and judge the working state of the ignition system. The specific method is: remove the high-voltage wire of the ignition coil or spark plug, align it with the spark plug or cylinder head at a distance of about 5mm, then turn on the start switch, turn the engine, and see the ignition jump. If the spark is very strong, the sky is blue, and the sound of fire jumping is very loud, it indicates that the ignition system works normally; Otherwise, the ignition system is not working properly.

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