Gold Lake Dahua Instrument in Carbon Tube Resistance Furnace

Jinhu Dahua's existing carbon tube resistance furnace can not meet the production requirements. It is necessary to carry out technological transformation through the use of Yudian temperature control table, MCGS touch screen and power regulator, and then use MCGS touch screen and Delta inverter, Jinhu Dahuawen. RS485 communication is performed on the control table to record production data. Phase adjustment is performed using a power regulator to improve the efficiency of the carbon tube resistance furnace and facilitate maintenance and repair. Through production verification, this design meets the requirements of technological innovation and has a good application value.

Keywords: Jinhu Dahua temperature control meter; MCGS touch screen; power regulator

0 Introduction Carbon tube resistance furnace is an intermittent operation resistance furnace, used under protective atmosphere, working temperature 2200°C, for carbide (such as tungsten carbide, boron carbide, etc.) and other high temperature materials, and sintering and heating of hard alloy. use. The current carbon tube resistance furnace electrical control method is relatively simple, prone to failure, can not meet the production requirements, and thus its technical transformation, the use of Jinhu Dahua Instrument, MCGS touch screen and power regulator for control production, making the equipment to meet the production , R & D needs, and provide reliable data for the refinement of the production site and production process, further reduce the use of equipment failures, and facilitate maintenance.

1 current status of carbon tube resistance furnace electronic control method Current carbon tube resistance furnace temperature control system principle is: through the high temperature radiometer to detect the furnace temperature, the furnace temperature signal to the temperature control table, temperature control table to AC contactor Control, the contactor directly controls the heater, noise, low reliability and poor control accuracy, and there is no production record, in order to solve this problem when the system is reformed, Jinhu Dahua Instrument is used for PID adjustment and output 4 -20MA signal control power regulator, using the MCGS and Jinhu Dahua instrument for RS485 communication.

2 Carbon tube resistance furnace transformation In this technical transformation, MCGS touch screen and frequency converter are used. The model of Jinhu Dahua temperature control meter is shown in Table 1 below.

2.1 Application of Jinhu Dahua Instrumentation This modification uses the Yujinhu Dahua Watch AI-808. The instrument adopts an advanced modular design and can be freely combined and purchased by users. The module used this time has X3 photoelectricity. Isolated linear current output module; S optically isolated RS485 communication module. The electrical control diagram of the instrument and power regulator is shown in Figure 2.

Fig. 2 The simplified electronic control diagram of the temperature control system of the carbon tube resistance furnace

AI-808 temperature control table has parameter auto-tuning function, which can help users determine the PID parameters (M5, P, T) in the system. Combined with the power regulator used this time, the temperature control of the carbon tube resistance furnace is more accurate. .

2.2 Application of MCGS The MCGS design process is as follows: New Project - Component Real-time Database - Generate Graphical Interface - Define Animation Connection - Device Window Configuration - Run Strategy Configuration - Test. According to this design process, detailed description will be given below.

2.2.1 Engineering Framework The engineering framework of this control system is as follows:
5 user windows: start, homepage, inverter settings, temperature control table settings, history records;
3 cycle strategies: Record control for 3 production shifts.

2.2.2 Component real-time database The real-time database is equivalent to a data processing center and also serves as a common data exchange area. The definition of the MCGS database is shown in Table 2.

Table 2 MCGS real-time database definition table

2.2.3 Configuring the User Window There are three different types of graphic objects that can be placed in the user window: entities, icons, and animation components. Primitives and icon objects provide users with a complete set of design and production graphics and methods for defining animations. The MCGS of this design has a total of five user windows, which are: start, homepage, inverter settings, temperature control table settings, history records.

.2.4 Device Window Configuration The device window is designed to place device components of different types and functions, enabling the operation and control of external devices. The MCGS touch screen, frequency converter, and temperature control table designed this time are all connected by RS485 communication. The inverter uses a communication port (RJ-11) to connect with MCGS touch screen port COM2 (485). Jinhu Dahua Meter uses terminal 3 and 4 Connect to the MCGS touch screen port EXT (COM4).
MCGS and frequency converter, temperature control table communication format and data format

The operation strategy itself is a framework provided by the system, which has a “strategy line” composed of policy condition components and strategy components. Through the definition of the operation strategy, the system can operate the real-time database and control the user according to the set sequence and conditions. The opening and closing of the window and the determination of the working status of the device components, etc., thereby achieving accurate control of the working process of the external device.

The technological transformation uses the proximity switch of Delta frequency converter and carbon tube resistance furnace to count the number of production. Delta frequency converter itself has a counter function, uses its multi-function input terminal M2 to connect with the proximity switch, and uses the multi-function terminal M3. Clear count. The MCGS touch screen communicates with the Delta inverter and reads the contents of the counter to record the production. In MCGS, using production strategy configuration, it is possible to carry out daily production records for each of the three production trains. First, establish a loop strategy, use the system function “!SaveData” in the script program to record and record, in order to record the production details of the bus every day.

2.3 Application of Power Regulators Power regulators are panel mounted power conditioning units that use thyristors and their trigger control circuits to adjust the load power. The power regulator has two control modes, one is phase control and the other is zero-position control, and the selection is performed according to different load conditions.

The technical modification uses a phase-controlled power regulator. The power regulator has the following features:
1, with RST phase fuse fuse disconnection indicator, and provide abnormal output contacts, can be used for system emergency control.
2, compact size, good heat dissipation, containing semiconductor-specific fast fuse, not afraid of load short circuit.
3, cooling fan action with temperature control, when the heat sink temperature 55 °C work, stop at 45 °C, can increase the fan life 2 to 3 times.
4. The protection function of the power regulator: Semiconductor special-purpose fast fuse fuse breakage detection, source power phase, body over temperature.
5. The power regulator is used with an intelligent PID controller or PLC with 0-10V, 1-5V, 4-20mA; it is mainly used for heating control of industrial electric furnaces.
The power regulator can control the thyristor to cut the phase angle of the AC power according to the size of the input signal, cut the frequency of each frequency, and can continuously output without any discontinuous phenomenon. The resistive or inductive load is applicable to the output mode of the thyristor. As shown in Figure 4 below.

Figure 4 Power Regulator Output Mode

The application of the Jinhu Dahua Power Regulator in the carbon tube resistance furnace improves the overload and short-circuit protection functions of the carbon tube resistance furnace, improves the reliability and working stability of the carbon tube resistance furnace, and satisfies the clustering of large-scale production environments. Control requirements. It has the advantages of convenient control parameter setting and process parameter setting, high control precision, high power utilization rate, strong overload and short circuit protection capability, and safety and stability.

3 Conclusion:
In this technical transformation of the electronic control system for carbon tube resistance furnaces, Jinhu Dahua has the following advantages:
(1) After the technical renovation of the carbon tube resistance furnace, the electrical modulator is used to control the power modulator for heating control, which can meet the production process requirements, ensure the reliability and stability of the equipment, and improve the efficiency of the equipment. Easy to maintain, easy to overhaul.
(2) Based on the MCGS production record design, full use of the counter function of the inverter, through the communication function of the Jinhu Dahua Instrument and the frequency converter, recorded the various process parameters of production, can facilitate the inquiry, has a good Visibility.
The above advantages have passed the verification of production. After several months of production and use of the equipment, the results show that the work satisfies the requirements of the original technological transformation, greatly improving the efficiency of equipment use, facilitating maintenance and inquiring production records.

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