The heating body adopts iron chromium aluminum material, the use temperature is 0 ～ 450 ℃, and the nickel chromium nickel silicon thermocouple is used as the temperature measurement. The relay controls the contactor on and off, so that the heating temperature is basically consistent with the given temperature. The heating power supply is a low-voltage 380V three-phase power supply. The heating body adopts star connection, and they are arranged on the top and bottom of the furnace. There are many disadvantages in the application of this temperature-controlled heating system, which is mainly manifested in the following aspects: 1. Introduction to Paperless Recorder (1) Because the control method is a three-position control (heating, holding, stopping), this control method has large temperature control fluctuations, poor temperature control accuracy (± 10 degrees), heating power is not adjustable, and energy waste is large Easy to break wire and high production cost. The other relay contacts act frequently, so the contacts wear badly. The failure rate is increasing year by year, which has posed a serious threat to production. (2) The temperature control instrument is seriously aging, there are faulty metal processing nets such as control failure, and the accuracy of the instrument control is difficult to meet the accuracy requirements of modern production technology. And this instrument requires frequent daily maintenance. (3) When the system is running, the noise is large and the vibration is large (the contactor is poorly attracted). In this way, the contactor mechanism parts are very easy to loosen, causing serious heating at the connection, and it is easy to form fire accidents and other electrical failures. 2. New temperature control system 2.1 The composition of the temperature control system The new temperature-controlled heating system is composed of low-voltage control elements such as temperature-controlled instruments, thyristor trigger circuits and paperless recorder instruments. The system includes 1 wire inlet cabinet metal processing network copyright, 4 control cabinets, which respectively control the main power supply system of the pre-oxygen furnace of Lanzhou Chemical Fiber Factory and the 35-zone heating system and chemical fiber drive control system. The specific instructions are as follows: 2.1.1 Operation of incoming cabinet Incoming cabinet operation includes closing and opening operations. The panel indications include voltage indication, three-phase current indication, and working power supply normal indication. 2.1.2 Chemical fiber drive control system A small torque motor controller electromagnetic clutch is used to adjust the wire-feeding speed to make the wire-feeding even 2.1.3 Control power system The control power supply mainly provides the control power supply of the 35-zone heating circuit and the power supply of the instrument and the chemical fiber transmission control system. In order to ensure the safety and reliability of the instrument, the instrument power supply should be powered by 380V / 220V isolation transformer. 2.1.435 District heating circuit operation The 35-zone heating circuit operation is divided into single-action and linkage operation. When single-acting, select the single-acting / linking button as the single-acting position SooQ.cn. At this time, operate the start-stop button of each zone to realize the power-off operation of each zone, and the corresponding indicator lights when the power-off is stopped. When the linkage is selected, select the linkage position and press the start button. The contactors in each zone attract the metal processing net. The corresponding operation indicator lights. When the corresponding linkage stop button is pressed, the contactors in each zone are disconnected and the corresponding stop indicator lights. Before the linkage and single-action operation, the power MCB and control MCB of each zone are in the closed position. 2.1.5 Paperless recorder (kh300GM) The main functions of kh300GM are: rich display screen; powerful setting function; perfect flow processing; practical disk operation function; convenient data statistics function; flexible alarm function; reliable communication function; randomly provided data management software. 2.1.6 Kehao KH103T temperature control table produced by the company 2.1.6.1 The performance of Kehao KH103T temperature control table produced by the company: Kehao KH103T intelligent temperature regulator has powerful programming and operation capabilities, which can be used in the occasions that need to automatically change the given value according to a certain period of time to control, to further improve the degree of automation of the control equipment. It has a 25-segment program layout function, which can set any value of the rising / falling slope of the given value; has programmable / operable commands such as jump, run, pause and stop, and can modify the program during program control operation; has two channels Event output function. The alarm output can be used to control the interlocking action of other equipment www.KEHAOAUTO.COM.CN to further improve the equipment's automation capability; the operation of the program running / pause / stop can be performed by installing an external switch to achieve interlocking, synchronous start operation or convenient operation; With power failure processing mode, measured value start function and preparation function, the program execution is more efficient and more complete. 2.1.6.2 Function and concept: Program segment: The segment number can be from 1-25, and the current segment (STEP) indicates the currently executing segment. Set time: refers to the total time of the program segment set operation, the unit is min, and the effective value is from 1-9999. Running time: Refers to the running time of the current segment. When the running time reaches the set time, the metal processing network reserves the copyright, and the program automatically jumps to the next segment to run. Jump: The program segment can be programmed to automatically jump to any segment in the 1-25 segment. Car Manufacturing Network All Rights Reserved, can achieve loop control. Jump can also be realized by modifying the value of STEP. Running / Stopping: The program is timed in the running state, and the given value changes according to the pre-programmed program curve. Performing a stop operation to search the enterprise network will cause the program to stop running. At this time, the running time is reset by the clear event output switch, and the control output is stopped. If the running operation is executed in the stopped state, the instrument will start the running program from the segment number set in STEP. The function of automatic stop can be programmed in the program segment. All rights reserved by Hanyang Technology Co., Ltd. and set the STEP value of the running segment number at the same time. You can also manually stop the operation at any time (STEP is set to 1 search enterprise network after execution, but the user can modify it). Event output: Occurred by the programming. It can control the action of the 2-way alarm switch during the program operation to facilitate the control of various external devices to synchronize or chain work. Power outage / power-on event: refers to the instrument is powered on or unexpectedly power off during operation. Hanyang Technology Co., Ltd. all rights reserved, can provide a variety of treatment options for users to choose. The user can set the running state of the meter after power-on by setting the parameter of the meter (run). Housed in compact packages with profiles as low as 0.95 mm, our range of electret condenser Microphones and MEMS microphones offers a variety of performance options to meet the voice capture and audio recording needs of your next design. Our microphones are available with omnidirectional, unidirectional, and Noise Cancelling directivity, while featuring sensitivity ratings from -54 up to -24 dB and signal to noise ratios from 56 up to 72 dBA. Microphones Mic Wireless,Wireless Microphone,Bluetooth Microphone,Condenser Microphone NINGBO SANCO ELECTRONICS CO., LTD. , https://www.sancobuzzer.com