Heat treatment wireless virtual meter central controlling system

Abstract

The invention relates to a thermal process wireless virtual instruments integrating control system used in thermal process technology field. It includes virtual instrument host computer, host computer wireless communicator, a set of slave wireless communicator, a set of A / D converter, a set of input / digital converter, a set of D / A converter, and a set of digital / output converter. The host computer connects to the host wireless communicator. The main wireless communicator communicates with slave wireless communicator. The slave wireless communicator connects to A / D converter or input / digital converter or D / A converter or digital / output converter. The invention has the advantages of flexible, good adaptability, strong function, convenient to use, low cost, etc.

Description

technical field [0001] The invention relates to a system in the field of heat treatment technology, in particular to a heat treatment wireless virtual instrument centralized control system. Background technique [0002] Heat treatment production process control includes temperature control, gas pressure control, gas composition control and mechanical movement control. Accurate temperature control is the first problem that must be solved to achieve heat treatment quality control. Gas pressure control is divided into the control of the total gas pressure and the control of the partial pressure of a certain gas in the furnace gas. The former is used in various vacuum heat treatment equipment and high-pressure gas quenching equipment, and the latter is widely used in the control of various gas chemical heat treatments, because The gas composition and the activity of carbon or nitrogen in the furnace gas are related to the gas partial pressure. [0003] Modern manufacturing has ...

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Problems solved by technology

Thermocouples or electric thermal resistances will gradually age when they work at high temperature for a long time. Factors leading to changes in thermoelectric potential (or resistance), when the drift of thermoelectric potential (or resistance) exceeds the specified allowable value, the temperature sensor will fail and must be replaced in time

Since the existing technology does not have the function of online continuous monitoring of whether the temperature sensor fails, it leaves hidden dangers in the reliability of temperature control

[0014] Although the method in the prior art "Design and Realization of Heat Treatment Furnace Temperature Intelligent Measurement and Control Expert System" can improve the accuracy of measurement, this method needs to install 8 thermocouples in each temperature control area, and the computer and each thermocouple have The disadvantage of connecting with wires is that it increases the difficulty and cost of equipment installation, and the more wires there are, the greater the possibility of electromagnetic interference

However, according to the algorithm proposed in this paper, at any time, the measured value of at least one thermocouple will fall into the "judgment interval of invalid data"

So that regardless of the quality of the 8 thermocouples, invalid data will be generated at any time, so that at least one channel is judged as a failed channel at any time, so this technology does not actually have the function of judging whether the thermocouples are invalid. It is even more impossible to analyze the cause of the failure

It can be seen that this technology also does not have the function of online monitoring of whether the temperature sensor is invalid.

[0015] 2. It is necessary to regularly use standard thermocouples to detect the temperature, and to correct the temperature measuring thermocouples or temperature control thermocouples according to the inspection results. In the prior art, it is not possible to directly connect standard thermocouples (or standard thermal resistances) with The function of monitoring the connection of computer or temperature controller and automatically correcting the temperature measurement value

Using manual methods for furnace temperature calibration and reading correction may introduce errors caused by human factors

[0016] 3. The monitoring system of the above-mentioned comparative documents still needs to have a temperature controller and an atmosphere controller, and still has not completely got rid of the dependence on traditional instruments

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