Control circuit of tunnel kiln quenching section and printed circuit board (PCB)

Abstract

The invention discloses a control circuit of a tunnel kiln quenching section and a printed circuit board (PCB). The control circuit comprises a control unit, a mode selection unit, a draught fan unitand a cold air valve unit, wherein the mode selection unit, the draught fan unit and the cold air valve unit are electrically connected with the control unit; the mode selection unit controls start orstop work of the cold air valve unit; the cold air valve unit comprises a first cold air valve group, and the first cold air valve group comprises a first cold air valve part controlling the air outlet state of a first air outlet and a second cold air valve part controlling the air outlet state of a second air outlet; and the control unit receives the signals fed back by the mode selection unit,controls the work of the draught fan unit and adjusts the working conditions of the mode selection unit and the first cold air valve group. According to the control circuit of the tunnel kiln quenching section, by controlling the work of the first cold air valve part and the second cold air valve part, the quantity of air output from the first air outlet is inconsistent with the quantity of air output from the second air outlet, and the problem of a large temperature difference of an existing tunnel kiln quenching section can be solved.

Description

Technical field [0001] The invention relates to the technical field of tunnel kilns, in particular to a control circuit and PCB board of the quench section of the tunnel kiln. Background technique [0002] The existing control method of the quenching section of the tunnel kiln is analog control. The frequency of the quenching fan is controlled by collecting the single-point temperature inside the kiln, thereby controlling the air intake of the quenching section of the tunnel kiln, so that the temperature of the quenching section of the tunnel kiln meets the process requirements Temperature; but for tunnel kilns with multi-layer structure, when large products or special products are fired, because the air volume entering the quenching section of the tunnel kiln is single and the air volume does not change, between each layer and between each position There is a cooling temperature difference, and the finished product has defects such as product burst, and the yield rate is low. [...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a control circuit for the quenching section of a tunnel kiln to solve the problems of large temperature differences in the quenching section of the existing tunnel kiln and low yields of finished products after firing

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