30+ Years of Precision Instruments
This paper mainly expounds the application of the new temperature control equipment in the electric industrial kiln temperature control system, and in detail the composition of the temperature control system, the principle, characteristics and functions of the components. The original text analyzes and demonstrates the system’s operating principles and its practical application effects. Finally, it is emphasized that the temperature control system is a new type of temperature control equipment which is widely used, available for economic development, effective control and very worthy of universal application.
1. preface
the heating body is made of iron-chromium-aluminum raw materials, the application temperature is 0~1000 ℃, nickel-chromium-nickel-silicon thermal resistance is selected as accurate temperature measurement, and the temperature digital display instrument is the basic PID control instrument panel. At the same time, the instrument panel is used to control the heating of the automobile relay, and the automobile relay controls the on and off of the AC contactor, so that the heating temperature is basically the same as the given temperature. The application heating switching power supply is a low voltage 380V three-phase driving force switching power supply. The heating elements are connected in a star configuration and are installed in the rotary kiln and at the bottom of the industrial electric furnace. The use of this temperature control heating system has many shortcomings, specifically in the following many levels:
(1) because the control method is three-bit control (heating, maintenance, termination), high-precision electronic thermostat This kind of control method has temperature control front> big ups and downs, the precision of temperature control is poor (± 20 degrees), and the heating output power cannot be adjusted, so the power consumption is large and the heating efficiency is low. And the automobile relay contact point posture often, so the contact point damage is more serious. The equipment failure rate has been steadily increasing, causing significant disruptions to manufacturing operations.
(2) The system is noisy and vibrates greatly during operation (the AC contactor is not well attracted).
(3) temperature control instrument disk embrittlement is serious, and there are common faults such as control failure, high-precision digital temperature controller The control precision can not reach the precision requirements of contemporary production process. And this instrument panel provides for regular daily maintenance.
