Remote temperature monitoring system for glass tempering furnace

Abstract

The invention relates to a remote temperature monitoring system for a glass tempering furnace, which comprises a central processing unit, a plurality of field signal acquisition units and a pluralityof PID control units, wherein the central processing unit comprises an RS485CPU processor, and an upper computer PC / touch screen, a radio frequency transceiver module and a memory IC electrically connected with the RS485CPU processor; each field signal acquisition unit comprises a temperature sensor for acquiring temperature signals inside the furnace and a temperature detection processor; and each PID control unit comprises a PWM control module, a PID processor and a second memory IC. The production cost is low, the field layout is convenient, the power consumption is small, the data transmission is stable, the acquired data can be transmitted in a radio frequency mode, and receiving within 2000 meters is barrier-free; when the PID processing unit receives the temperature data, corresponding PWM control is carried out according to the temperature control data set by the upper computer, and precise fuzzy PID adjustment is thus realized; and balance and stability of several temperate zones in the glass tempering furnace can also be precisely controlled.

Description

technical field [0001] The invention relates to a temperature monitoring system, in particular to a remote temperature monitoring system for a glass tempering furnace. Background technique [0002] Tempered glass is an indispensable material for building materials, furniture, and automobile glass. In recent years, the output of tempered glass in my country has been ranking first in the world. With the continuous improvement of production technology, tempered glass has become more and more widely used. There are more and more specifications. Tempered glass is a method of rapid cooling after heating to a certain temperature, as well as glass specially treated with chemical methods. In addition to the same transparency as ordinary flat transparent glass, the glass also has the characteristics of high resistance to sudden temperature changes, impact resistance and high mechanical strength. [0003] At present, the application of insulating glass or LOW-E glass in the constructi...

AI Technical Summary

Problems solved by technology

[0004] The tempering furnaces known in the market all use wired connection temperature control systems, which have defects of varying degrees. The biggest problem is that various failures often occur in wired control lines. The inevitable high temperature monitoring makes the lines age quickly, thus affecting the service life. Its stability, reliability, etc. are also affected

Moreover, conventional kilns on the market are controlled by single or up to 8 thermocouple module heating couples. Since large kilns generally have a large area, it is difficult to control the temperature uniformity with a few temperature points for space heating. Higher precision controls the temperature uniformity in a wide range, so as many local temperature control points as possible are used. In order to achieve precise temperature control, a general kiln arranges as many thermocouple points as possible to achieve temperature control. Uniformity, generally 40 to 120 points, some even as many as hundreds of points

Due to a large number of distribution points, a large number of thermocouple modules must be used. Generally, the temperature control of one line reaches 500 yuan, so the cost remains high. The second biggest problem is that the service life and anti-interference ability of the line are relatively poor. There is no way to eliminate interference, low stability, reliability, etc., and various failures often occur

Due to the huge amount of real-time data that data points need to transmit, it cannot be transmitted over long distances, which causes many difficulties for practical applications.

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