“Case” solenoid valve common failure and solution method

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The solenoid valve is an industrial aerodynamic element we often use. It can drive the back and forth movement of the cylinder, thereby driving the mechanism movement to achieve the function of our hope. The frequency of failure of this component is also relatively high. How to clearly judge and exclude these problems is that our electrical workers must master a skill. Of course, the function of the solenoid valve not only controls the gas, it can also control water, oil, etc. with some media, and according to its functions, there are different models, like a few passage, whether to keep pressure. Based on the principle of work, is it pilot or direct. You can also design the appearance according to different design, there is a base or one -in -one. The solenoid valve is now developing in centralized intelligence. I will introduce to you in the future. This time we mainly explain the judgment of the failure of the solenoid valve in the work.

We will encounter the solenoid valve in the on -site maintenance, and the cylinder will not move. What should I do at this time? First of all, it is necessary to determine whether there is a power supply. Generally, the rated voltage of the solenoid valve is AC 220V or DC 24V. Then the positive and negative electrodes of the DC power supply drive the solenoid valve should be paired, and the power indicator light will not light up. If different voltage levels are wrong, this will cause the light -emitting diode to be burned and severely burned the coil.

「案例」电磁阀常见故障与解决方法

Measure whether there is a power supply. If the power supply is normal, it means that there is no problem with the control line. The problem is that it appears on the solenoid valve and the cylinder. Next, you need to measure the resistance value of the coil. First, use a multimeter to measure its interruption. The resistance value is approaching zero or infinitely large, which means that the coil is short or disconnected. If the measured coil resistance value is within the normal range (the solenoid valve model is different, the normal coil resistance value is different, there are dozens of euros, and there are hundreds of euros; The same type of electromagnetic valve is compared with the resistance value), and the power is magnetic, you can determine that this coil is a good problem.

Because the compressed gas provided by some factories contains a lot of other impurities, and the three -connected three connections have not played an ideal effect. The long -term solenoid valve work will inevitably be stuck by impurities. As a result, the solenoid valve is stuck without conversion. Generally, due to the internal stain stuck, we can first use the manual button of the solenoid valve to start with a small word. The manual design is to facilitate debugging. Plug the valve core (the main valve core of the direct power valve, the pilot valve core of the pilot valve) to achieve the same effect as the electromotarous valve core of the electromotive valve coil. Experimental solenoid valve cards are not stuck. We can clean the electromagnetic valve cavity, and clean the electromagnetic valve core, and the valve core damage and other serious problems. Finally, the power or bad was tested.

Another type of failure is the internal gas of the solenoid valve. How to judge whether the solenoid valve is channeling or the cylinder.先简单讲一下他们的工作原理,以两位五通电磁阀为例,两位是指它的阀芯有两个位置,五通是指电磁阀上一共五个口,一个进气孔1, Two outlets 2 and 4, two exhaust holes 3 and 5. The working principle of the solenoid valve is the starting state. When 1, 2 air intake, 4, 5 exhaust, and the coils are powered on, the static iron core generates the electromagnetic force, so that the pilot valve moves, and the air path enters the valve pilot piston to start the piston. In the middle of the piston, the sealing round surface opens the channel, 1, 4 air intake, 2, and 3 exhaust. When the power is disconnected, the pilot valve is reset under the action of the spring to return to the original state. The solenoid valve is because the tightly sealing ring of the valve is not well sealed, and the phenomenon of 4 and 2 air pores has Qi. Therefore, the phenomenon of the solenoid valve’s gas is that the cylinder cannot reach or move.

The working principle of the cylinder is simpler. The dual -action cylinder we introduce: 2 and 4 holes of the solenoid valve on both sides of the cylinder piston provide pressure to achieve forward or backward movements. When the compressed air on both sides of the piston enters 1, 4 to enter and discharge 2, 3, or 2, 3 into 1, and 4, the piston moves towards both directions. Essence Generally, we choose the exhaust adjustment speed. The cylinder is composed of cylinder tube, end cover, piston, piston rod, and sealing ring. Generally, the cylinder gas is damaged in the cylinder sealing ring. Lowed from 2 and 3. You can touch the gas in 3 places. The intact situation of the cylinder is that Qi 1 and 4 enter the left cavity of the cylinder. Its fault phenomenon is very similar to that of the solenoid valve. The difference is that the solenoid valve is 4 or 2 air pores at the same time, while the cylinder gas is always out of the cylinder.

「案例」电磁阀常见故障与解决方法

Figure 1 The structural diagram of the two five -pass solenoid valve

Figure 2 The principle diagram of two five -pass solenoid valve

There are also some maintenance during maintenance. Some of our solenoid valves have a base to check the base sealing ring, and the sealing circle will be aging for a long time. The aging of the sealing ring will cause the electromagnetic valve to leak air and gas. At the same time, some solenoid valves are connected to the pressure regulating valve. Sometimes the pressure regulating valve is turned off or blocked, which will cause no ventilation and no action. The mechanical components of some movement such as iron, springs such as iron, springs will be damaged for a long time.

Source: Technology Training Network -PLC enthusiasts, authors: Li Yu, must not be reprinted without authorization!

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「案例」电磁阀常见故障与解决方法

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