From the perspective of automobile production technology, in recent years, the automation level of the domestic automobile manufacturing industry has been greatly improved, and the obvious trend is to improve assembly accuracy and improve production efficiency. As a positioning and detection method, a variety of sensors have been popularized in all aspects of the production line, especially the inductive sensors widely used by car manufacturers for positioning, which monitor the running status of the entire line in real time. But for the sensors of different manufacturers and multiple series on the market, how to choose the most suitable product for the application in the field of automobile manufacturing has become the key. Discussion on the characteristics of inductive sensors No one is unfamiliar with inductive sensors. It is a common way to locate metal objects at close range. Because the detection is mainly done through the Hall effect, it is also called a Hall sensor. Choosing the right sensor will greatly improve the stability and reliability of the equipment operation, and also maximize the possibility of reducing the failure or damage of the sensor and reducing unnecessary maintenance investment. In the production process of the automobile manufacturing industry, inductive sensors are widely used as positioning detection. How to choose the most suitable product for this industry is particularly important. Requirements of the stable operation of automobile production line for inductive sensors Take a newly-built car factory as an example, the factory uses a large number of ELCO (Yike) C40 series inductive sensors to locate the slippery. This series of sensors is square, the size of the detection surface is 40 * 40mm, and the rated detection distance is up to 40mm. The selection of this series of sensors mainly considers two factors: First, detect the attenuation of distance. Slip is iron, suitable for inductive sensor detection; the size of the measured part of the slip is slightly smaller than the size of the standard test object (the standard test object size is 3 times the rated detection distance, in this application, the standard size should be 120 * 120mm ), In this case, there will be a certain attenuation, the above sensors have done a good job in this respect, and the attenuation is extremely small. N-NET Modular Media Converter Chassis` transparently extend copper to copper, copper to fiber, multimode to multimode and multimode to single mode fiber by pairing modules in this high density chassis with Media Converter Chassis standalone media converters, or standalone Ethernet extenders. Media Converter Chassis Media Converter Chassis,14 Slots Media Converter Chassis,16 Slots Media Converter Chassis Shenzhen N-net High-Tech Co.,Ltd , http://www.nnetswitch.com
The internal structure is composed of two parts: the front end is composed of an iron core wound with a transmitting and receiving coil; the rear end is a circuit part, and the whole is encapsulated in a plastic or metal casing. During operation, an alternating magnetic field occurs in the electromagnet core part, which produces an eddy current effect on the surface of the close metal object, thereby weakening the LC oscillation circuit. The amplification circuit part analyzes the weak LC oscillation circuit change of the electromagnet core receiving coil and gives a corresponding output.
For different outline sizes, the rated detection distance is generally up to 100mm. Under normal conditions, each manufacturer's nominal detection distance is the rated detection distance measured under laboratory conditions. In practical application, considering the environmental factors in various aspects, the reliable detection distance is about 80% of the rated detection distance, but there are certain requirements for the measured object. Due to the magnetic permeability and size of the material to be tested at the application site, in general, the requirements of the standard test object cannot be met, then the detection distance of the sensor will be further attenuated, which is why many users feel that the detection distance of the inductive sensor is more The reason for the much smaller nominal. In the case of such non-standard testing, there are large differences between manufacturers and their different series of products. In addition, more in-depth, there are differences in electromagnetic interference resistance, ambient temperature, voltage disturbance and installation requirements. 
With the increasing demand for automobiles in the Chinese market and the requirements for vehicle performance. Automobile manufacturers have higher standards for their production lines in new projects. On the one hand, it is necessary to meet the requirements of the automobile manufacturing process; furthermore, it is necessary to ensure the stable and smooth operation of the entire line and minimize the time for maintenance and commissioning to ensure higher production efficiency.
As we all know, the automobile manufacturing process mainly includes four main parts: stamping, welding, painting, and assembly. Inductive sensors are widely used in each part. Especially in the welding, painting and final assembly workshops, many inductive sensors are distributed on the accumulation chain conveyor line, and play a role in the detection of slippage or in-track detection. 
ELCO C40 series sensors
1. Longer detection distance: Slippage sometimes has a certain vibration during the movement. The sensor needs to have a certain detection distance to ensure that the measured part of the slippage cannot be damaged due to the vibration leaving the detection area or hitting the sensor.
2. Moderate form factor: Generally speaking, the detection distance and volume of inductive sensors are proportional. For the detection distance of 40mm, the square shell size of the 40 * 40mm detection surface is very suitable.
In addition to the selection of this main parameter, more details must be considered to suit the field conditions and make the sensors more compatible with the field environment and equipment.
Secondly, anti-jamming capability on site. This is a problem that cannot be ignored. Ordinary inductive sensors are easily interfered by motors or frequency converters. Many technicians only choose sensors with strong anti-electromagnetic interference for applications in this vicinity. However, in the automobile manufacturing workshop, the plant is large, and the on-site technicians are used to using the intercom to communicate, especially when walking and talking on the intercom, they will inadvertently approach the sensor, resulting in a short-term failure. ELCO is very concerned about the C40 series products in this regard, to improve its overall electromagnetic compatibility, to avoid the occurrence of misoperation.
Furthermore, the installation aspect. With the popularization of inductive sensors, the sensors have not only improved in electrical performance, but their mechanical design has become more and more user-friendly. In this application, the sensing surface of the C40's inductive sensor can be easily adjusted to 5 directions. Without any tool assistance, there is no need to cut off the power supply and output plug-in, just by manual operation. It provides convenience for installation and use in different detection directions and maximizes humanized installation. Reduced the stocking of multiple similar products and reduced the time for installation and maintenance.
Finally, the guarantee of stable operation. The C40 has an IP67 protection level, which prevents any erosion of oil and dust in the use of the depot. In addition, when the slipper passes through the track, the vibration exists for a long time, and the excellent vibration resistance of the C40 also plays a very important role in this application.
In this project, the sensor technology solution provided by the ELCO company to the car manufacturer according to its working conditions is a relatively successful case, and it has achieved a stable and reliable detection link for automatic control in this project as a whole.
NT-R14D NT-R16D is a kind of cost-effective rack (2U) widely used to provide power for media converter modular type in the equipment room. Different types of card type media converter developed by our company can be inserted into this rack, of which the total slots are up to 16. It is furnished with two power supplies: main power supply and spare one, and supports its automatic switch-over.