Impedance measurement-based PC steel bar electric induction excitation frequency control apparatus and method

Abstract

The invention discloses an impedance measurement-based PC steel bar electric induction excitation frequency control apparatus and method. The apparatus comprises a wire drawing machine arranged on a steel bar conveyor belt, a heating red copper tube is also arranged on the steel bar conveyor belt, and the upstream and the downstream of the heating red copper tube are respectively provided with current vortex impedance measurement devices with the same structure; the impedance output ends of the two current vortex impedance measurement devices are respectively connected with the two impedance input ends of a controller, the current vortex impedance measurement devices respectively transmit the impedance values of steel bars before and after heating to the controller, and the controller controls the excitation frequency of a heating red copper tube induction power supply. The apparatus and the method have the advantages of guaranteeing of the steel bar heating temperature and the heating temperature uniformity of the steel bars of the heating red copper tube, improvement of the steel bar rolling quality, high heating efficiency, simplicity and convenience in the whole steel bar rolling process, and reliability in running.

Description

technical field [0001] The invention relates to a defect detection device for building steel materials, in particular to a PC steel bar induction excitation frequency control device and method based on impedance measurement. Background technique [0002] Hot-rolled ribbed steel bar is a kind of steel bar with two or three crescent shapes formed by hot-rolled wire rod through multiple cold-rolling reductions, one rib pressing and internal stress relief, so as to increase the grip with concrete It is one of the most commonly used steel materials in civil engineering. my country's current technical standard for the production of steel bars GB1499-91 stipulates that the steel type is 20MnSi, and the strength of commonly used export grade III steel bars is 590MPa. Most of the domestic steel bars are grade II steel bars with a strength of only 460MPa. Prestressed high-strength steel bars are widely used abroad, namely PC concave threaded steel bar with a strength of 1420MPa, which...

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Problems solved by technology

[0004] At present, the performance of electrical components in my country is not very stable, and the matching of inductance and capacitance is not easy to maintain in the best state. The frequency control of induction heating in the production process of hot-rolled ribbed steel bars is mainly to adjust the power supply excitation frequency according to the power. The skin effect of heating, coupled with the rapid and continuous production of hot-rolled ribbed steel bars, will easily cause the temperature field of the steel bars to be uneven during the induction heating process, which will affect the subsequent rolling process and lead to a decrease in the mechanical properties of the hot-rolled ribbed steel bars.

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