【Enhance machine specific frequency converter application principle, Shandong Lee crown of Electronic Science and Technology Co., Ltd., Tel: Caojing Li 15953810777, Shandong Lee crown of Electronic Science and Technology Co., Ltd. is specialized in producing high-voltage inverter rig dedicated variable frequency, hoist dedicated the inverter frequency heating power, constant pressure water supply control cabinet, KJPT series of mining flameproof and intrinsically safe electrical submersible pump voltage inverter, a variety of low-voltage general purpose inverter and traction network leakage protection, BKT-1 enhance the comprehensive protection the WDT-type temperature logging devices, remote power monitoring system, air compressor microcomputer protection device fan remote control system, air compressor remote control system, flameproof electric meter, portable switch, digital hedging signal device, the language of sound and light signals, explosion-proof switch check station. Concurrently such as mechanical and electrical products, mining accessories, rubber products.