Whether it is a high-speed railway or a 400-ton or 500-ton transformer, China's heavy equipment is often enviable. First of all, judging by the size, it gives a fantastic feeling. A large boiler of 1 million kilowatts is worth hundreds of millions, and the unit price is often not low. Sensors, on the other hand, are a troublesome industry.
Sensors are one of the equipment accessories in China, as a marginal component industry. Although it is difficult to move without many devices, it was born to stay outside the lights and will always be a supporting role. When it comes to the characteristics of the order, the master of the manufacturing process will also look helpless. There are more than 50,000 varieties of sensors in the world. A factory may need to produce hundreds of models, and many orders are usually in the thousands, or only hundreds, dozens, or even a few, typical for small batches and multiple varieties. The technical difficulty is large, the order is complex, the value is small, and the field is complex. There's no doubt that sensors are a chore industry.
However, sensor companies need to choose their own breakthrough path, and Made in China always has to face difficulties.
Art on a seesaw.
The role of the bearing lubrication system is very important, taking the bearing industry as an example. The bearing lubrication system will have many lubrication lines. At these crossroads, the oil valve dispenser plays the role of a traffic cop at the intersection. It is responsible for delivering lubricating oil to different journeys. However, the oil valve distributor is only a follow-up mechanism, not an actuator. The baton in its hand is an actuator that pushes the distributor to open and close. To keep the hydraulic pipeline open, it is necessary to detect whether the distributor is in place, and then notify the actuator whether to continue the action. This task of "detection" is entrusted to the sensor.
In the field of wind power generation, bearings are indispensable for the rotation of large wind turbines, and lubrication systems in the wind power industry are also very important. At present, international bearing companies mainly use the switch technology of Hall principle and use German brand sensor products. But this sensor has a fatal hazard in the field of wind power generation, that is, the electromagnetic compatibility problem is not well solved. Due to the large torque of wind turbine motors, large currents often occur, causing strong electromagnetic interference. Hall's principle belongs to magnetic switches, which itself detect changes in the external electromagnetic field. Even small changes in the magnetic field can be felt. However, due to the particularity of wind power generation, this Hall principle switch often occurs occasionally, false triggering and other phenomena, resulting in misjudgment. This is a problem for the wind power industry, which requires high levels of stability.
Sensor switches are another option. Hall itself does not produce a magnetic field. By detecting the external magnetic field, it is easy to form a misjudgment when generating an external superimposed magnetic fieldAn inductance is a self-generated magnetic field, and its position can be determined by detecting the degree of damage to the self-generated magnetic field. In this way, it is not affected by external electromagnetism, so it is a good choice.
In fact, sensors are a very strange industry. These principles are open to no one and not confidential, but process optimization is an in-house skill. Technology selection in sensor R&D;A seesaw principle in itself. Add half a catty on the left and eight taels on the right.