In view of the shortcomings of energy waste, poor precision and unsafeness in the current heating control of tempering furnaces, this paper proposes to use PLC combined with thyristor to move to the trigger to control, through the actual application, prove the transformation The system is characterized by reliable control, safety and fast response.
Abstract: In view of the shortcomings of energy waste, poor precision and unsafeness in the current heating control of tempering furnaces, the paper proposes to use PLC combined with thyristor to move to the trigger to control, through practical application, prove The modified system has the characteristics of reliable control, safety and fast response. This control method is an ideal way to replace the traditional relay control method.
Key words: tempering furnace, thyristor shifting trigger, PLC
1. Project Overview:
Hefei Hi-Tech is affiliated to Tianjin Boruitai Electronics Group. The company has a scale of 1,100 people, with an annual industrial production value of about 500 million yuan and a total tax payment of 10 million yuan. The instrument of Xiamen Yudian is applied in the renovation project of crystal glass tempering furnace. Color crystal glass is an ideal new decorative material. It prints a color coating with ink or a transparent ink coating on the surface of ordinary flat glass or tempered glass, and then coats a resin with cross-linked molecular structure. Then, the plastic colored crystal grains (or glitter paper, gold powder, silver powder, and laser powder) are pasted on the rubber layer, dried or dried, and then coated with an epoxy resin protective layer to make a color. Crystal glass. Heating control is critical during the production of the entire crystal glass. It directly affects the yield of crystal glass.
2, system composition and working principle
One of the most important devices for producing glass-ceramics is the glass tempering furnace, which is a device that produces tempered glass by physical or chemical means, including physical glass tempering equipment and chemical glass tempering equipment.
The physical glass tempering equipment is subjected to the technical treatment of heating the flat glass and then quenching, so that the surface layer of the cooled glass forms compressive stress, and tensile stress is formed inside the glass, thereby achieving the purpose of increasing the strength of the glass and making the ordinary annealed glass into tempered glass. . Since this tempering method does not change the chemical composition of the glass, it is called a physical mode glass tempering equipment. Chemical tempering equipment improves the strength of glass by changing the chemical composition of the glass surface. At present, there are methods such as surface de-alkali and alkali metal ion exchange; since this tempering method changes the chemical composition of glass, it is called chemical glass tempering equipment. .
At present, most of the enterprises adopt physical methods. The production of color crystal glass of Hefei Gaoke Technology also adopts physical methods. The customer originally used the contactor to directly control the heater, which has high noise, low reliability and poor control precision. In order to solve this problem when the system was modified, a PLC combined with a thyristor shifting trigger was adopted.
2.1 system composition:
2.2 System Control Process Description
The temperature sensor measures the real-time temperature in the continuous bending furnace and sends it to the PLC. After comparing with the set value of the PLC, it outputs a 4-20 mA current signal to the thyristor shifting trigger, and the thyristor shifts to the trigger output trigger. The signal is given to the thyristor power module to precisely control the temperature in the continuous bend furnace.
2.3 Yudian AIK6 thyristor shifting trigger
Xiamen Yudian AIJK6 thyristor shifting trigger is an intelligent trigger using single-chip technology. It is powerful and reliable. It can be used for various resistance wires, silicon carbon rods and transformers. Various types of industrial electric furnaces such as tungsten wire can also be used for motor soft start control. It has the following features:
â—† 0~20mA (0~5V)/4~20mA (1~5V) signal compatible input.
â—† Use computer technology for linearization power correction. When the load is resistive, the output power is proportional to the input signal.
â—† Phase loss detection, over current detection and alarm function.
â—†Automatic synchronization function, the phase sequence is not required when connecting the thyristor trigger line.
◆Using all-optical isolation and “burning not bad†technology, the reliability is very high, and the interference to the input terminal is small.
â—† Soft start / soft stop function with adjustable current feedback or delay time, can adapt to silicon molybdenum rod, tungsten wire, motor and inductive load.
â—†Including switching power supply, it can be directly powered by 220VAC power supply, and has 5V and 24V two sets of DC power output.
2.4 Description of the scene:
Curved tube tempering furnace as shown below
a, work is more reliable, the insurance factor is relatively high.
b. Internal conduction, no contact, no spark, no noise, can be suitable for occasions with high requirements on fire performance.
c, the control speed is fast, the connection time is an order of magnitude higher; the power conversion can be basically unaffected.
d, easy to control, as long as the trigger signal can control the thyristor to turn on or off.
e. The structure is simple, and there is basically no mechanical structure; the disadvantages of adjusting the complexity of the machine and the electric device are avoided.
f, energy saving, almost no power consumption, the power consumption of the general small contactor coil is about 30W, and the power consumption of the large contactor is more than 100W.
4, summary
After the customer's system has been transformed, it is currently working well, easy to operate, and has a high product qualification rate. Many of their products are used in world-renowned brands such as Haier, Gree, Samsung, LG, Siemens and Sony, and are well received by customers. Subsequent equipment also needs to be technically modified, indicating that it will continue to recommend the use of Yudian meters.
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