1. Summary

TYHI is the largest excavator manufacturing enterprise in China . From 1961 it researched and developed the first 4 m³ electric rope shovel successfully, the standard dipper capacity developed from 4 m³ to 75 m³ formed the whole series mining use excavator such as WK -4C , WK-8, WK-10B, WK-12, WK-20, WK-27, WK-35, WK-55 and WK-75, which adopting gear-rack crowding and AC VVVF, etc. advanced international technology. The WK-75 mining excavator is now biggest mining excavator in the word. Up to now, more than 1300 excavators has been supplied in China; the products take up more than 95% of market share in China, which widely used in coal mine, metallurgy mine and ferro-metal mine, etc. More than 20 excavators exported to abroad, such as India , Pakistan , Myanmar , Peru , Russia and Kazakhstan , etc.

Recently, TYHI researched and designed the semi-continuous complete set of equipment consists of mobile crusher, stationary or semi-stationary crusher, mobile or stationary belt wagon, hopper car, cable reel car, belt conveyor, waste disposal machines, unloading cars, etc. which is able to meet the requirement of hard rock crushing and transportation in open pit mines with annual output of 10 million tons and more.

2. WK Series Mining Use Excavator

WK series excavator is the large excavating equipment for open-pit mine developed by TZ. It combines the successful experience accumulated for years from manufacturing of mining shovels, at the meanwhile absorbs lots of advanced technology for design, processing, manufacturing and control from home and abroad. It is suitable both for stripping and excavating on open-pit coal mine, iron mine and ferro-metal mine.

WK series excavator has adopted state-of-art technology, like three-dimension imitation and definite circle analysis. It is of reasonable performance, working dimensions and exerts its efficiency to fully play to enhance the matching ability with all sorts of haul trucks and crush station to better satisfy the users’ requirements of higher loading and lowest producing cost.

Electric system adopts Rectifier/Regeneration to common DC Bus-bar and variable frequency speed adjustment. The electric control, taking PLC as the core, is a 3-stage system of up-position monitoring, field bus and frequency variable speed control. It is of futures of no disturbance to power grid allowing wider range of power voltage fluctuation and high power factor. The system is loaded with software to optimize the dig/cut curve and automatically optimization of hoist and dig power distribution. The system can realize self troubleshooting and running status display, electric power calculating and so on. This system has the advantages of state-of-art technology, reliable operation, high transmission efficiency and low power consumption.