Let's take a look at the contact plate burn and partial contact problems that occur during the use of medium frequency induction heating furnaces

Anyone who knows the medium frequency induction heating furnace knows that this equipment mainly heats the workpiece through an inductor. The inductor is an important part of the medium frequency induction heating furnace. Its quality not only has a lot of impact on the workpiece, it also has a great impact on the quality of the equipment. There will be some problems during the use of the sensor, such as burns and partial contact of the contact plate, failure of the magnetic conductor, short circuit between the conductive plates, etc. Today, Zhengzhou Gou's technical staff will analyze the burn and partial contact problems of the sensor contact plate.

1. Burns between the joint surface of the sensor contact plate and the transformer contact plate

(1) The contact surface should be smooth, the surface roughness should not be greater than the specified value, and there should be no oxide scale on the surface. Higher manufacturing technology is to coat this surface with a layer of silver. Non-silvered contact surfaces will become oxidized and should therefore be sanded frequently with fine emery cloth. In addition, regardless of whether bolts, calipers, cams, or hydraulic pressure are used, the contact surface must be pressed tightly. Contact resistance decreases with increasing contact pressure. Some designs not only specify the bolt size, but also specify the torque to ensure that the contact resistance is within a certain value. When the contact plate is not pressed tightly, the contact resistance rises sharply, causing the contact surface to heat up and oxidize. The contact resistance of the oxidized surface increases, and the heating becomes more severe. In this vicious cycle, finally, the contact plate becomes red and burned.

(2) The better the bonding surface fits and the tighter the contact, the smaller the contact resistance.

2. Partial contact on the contact surface

Offset contact on the contact surface mainly occurs in the following two places:

(1) The tapered contact surface of the circular feed head. Most semi-annular crankshaft inductors use this structure. This feed head is designed to be placed in a movable insulating bakelite seat. If the installation is incorrect, the two concave conical surfaces will not coincide with the convex conical surface, resulting in partial contact. Offset contact reduces the conductive area, increases resistance, and reduces the efficiency of the sensor.

(2) The opening and closing surfaces of the opening and closing sensor are in partial contact. In addition to increasing the impedance during partial contact, it will also affect the width of the heating zone of the workpiece. In this regard, attention must be paid to the adjustment and use of the sensor.

This article briefly introduces the contact plate burn and partial contact problems that occur during the use of the sensor. These are just some of the problems that occur during the use of the sensor. Zhengzhou Gou's is a manufacturer that specializes in the production of high-frequency induction heating furnaces. It wants to understand the use of various sensors. If you want to know more about the problems that occur when using sensors, please leave a message.