Heat treatment wireless virtual meter central controlling system

A centralized control system and virtual instrument technology, which is applied in the system field of heat treatment technology, can solve the problems of not being able to judge whether the thermocouple is invalid, the possibility of the wire being subjected to electromagnetic interference, and the hidden danger of temperature control reliability.

Inactive Publication Date: 2007-01-31
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

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

Method used

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  • Heat treatment wireless virtual meter central controlling system
  • Heat treatment wireless virtual meter central controlling system
  • Heat treatment wireless virtual meter central controlling system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Embodiment 1: Application of heat treatment wireless virtual instrument control system in automobile gear factory

[0120] The heat treatment workshop of the automobile gear factory has a well-type gas carburizing furnace, a mechanized quenching tank and a tempering furnace. Pit furnace with oxygen probe to measure p in the furnace o2 , a furnace temperature monitoring thermocouple (1 # thermocouple). Drop in methanol and isopropanol as carburizing agent, and install a solenoid valve on the pipe leading into the carburizing agent. The well type gas carburizing furnace is divided into upper and lower temperature control areas, in which two groups of electric heating elements are respectively composed of 1 # and 2 # The thyristor power regulator adjusts the heating power. 2 # 、3 # Thermocouples are a set of double thermocouples used for temperature measurement in the upper zone. 4 # 、5 # The thermocouple is a set of double thermocouples used for temperature meas...

Embodiment 2

[0141] Example 2: Centralized Control System of Virtual Instrument for Vacuum Heat Treatment Flexible Production Line

[0142] The function definition of the system:

[0143]The vacuum heat treatment flexible production line is composed of a vacuum furnace moving left and right, a high-pressure gas quenching chamber, and an oil quenching chamber. The vacuum furnace has three working positions. For the station docked with the gas quenching chamber, the vacuum furnace requires temperature control and vacuum degree (pressure) control. The working process is as follows, the workpiece is loaded into the furnace, the furnace door is closed, the vacuum pump is turned on, and the furnace pressure of the vacuum furnace is kept below 1.3Pa. Power on and heat up to make the furnace temperature reach the set heating temperature, generally 930°C-1100°C (depending on different workpieces, set in the process file). Measure the furnace temperature with a thermocouple, and adjust the heating...

Embodiment 3

[0153] Embodiment 3, wireless virtual instrument centralized control system for heat treatment of sealing multi-purpose furnace production line

[0154] The sealed multi-purpose furnace is composed of a charging lifting table feeding trolley, a sealed multi-purpose furnace, a cleaning machine and a tempering furnace, such as Figure 7 As shown, the feeding car can move left and right, and there is a pushing mechanism on the trolley to push the workpiece into each equipment or pull the workpiece from each equipment to the feeding car. The sealed multi-purpose furnace is composed of a front room and a working room. The front room There is an outer furnace door and the bottom of the front chamber is a quenching oil tank. The upper station of the quenching lifting mechanism is at the same level as the loading plane of the feeding trolley and the working furnace, and the lower station of the quenching elevator makes the workpiece immerse in quenching oil. The quenching oil tank is ...

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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. technical background [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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 潘健生钱初钧胡明娟
Owner SHANGHAI JIAO TONG UNIV
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