Reformation Design of the Feeding System of the Semi-Mobile Crushing Station

The crusher station of the Qi Dashan mine is the semi-mobile crushing station. The crusher station has three parts. They are a heavy plate type material feeder having a receptacle trough, a crusher having a tower for controlling and a blowdown equipment. The hazard rate of the heavy plate type material feeder having a receptacle trough is hign and it operating cost is costly. So the heavy plate type material feeder having a receptacle trough will be thrown off. A new feeding system will take the place of it. And new steel structure beams will be designed. The weight of the new feeding system will be born by the steel structure beams. The ore or rock will be pured into the crusher directly.

Indirect expense cost. The crusher can not be filled with ore or rock using the heavy plate type material feeder having a receptacle trough. This reduces the productivity effect. This is also uneconomical operation. If the crusher can be filled with ore or rock the productivity effect will be increased. And this will reduce using scaleboard. This will save operating expense. The failure rate of the heavy plate type material feeder having a receptacle trough is very high. The replacement time of the scraping belt and the attachment is 100×2 hours. These reduce the operating rate of the system.

Structure design of the steel structure beams
The semi-mobile crushing station will be transformed. The heavy plate type material feeder having a receptacle trough will be thrown off. The steel structure beams will be designed. The weight of the new feeding system will be born by the steel structure beams. The steel structure beams are welded steel plates. They are space steel structure. The steel structure beams have two parts. One part is the main beam. The other part is the auxiliary beam. The main beam have two beams and the auxiliary beam have four beams. The structure is enormous. As illustrated in Fig. 3. The four tips of the main beam are set on the concrete shoulder. And they are welded partly. The eight tips of the auxiliary beam are fixed using bolts. Structure of the steel structure beams. The new crushing station have two parts. They are a crusher having a tower for controlling and a blowdown equipment. The heavy plate type material feeder having a receptacle trough will be thrown off. The crusher having a tower for controlling and a blowdown equipment will parallelly move 23.82m to the dumping terrace. The socket of the dumping terrace will be widen. The headroom will be 17m. A new receptacle trough will be set up on the top of the crusher. The steel structure beams will be around the new receptacle trough. There will be two EH3500 EV with in-wheel motor drives on the steel structure beams. The two EH3500 EV with in-wheel motor drives will take off ore or rock to the new receptacle trough. The new receptacle trough will be syndeton in block. Finishing the installation and the backout will take 3～ 5 days. And the moving of the crusher having a tower for controlling and a blowdown equipment will not be influenced. The weight of the new receptacle trough is 650t. And the gross weight of the new feeding system will be born by the steel structure beams. The plan view of the semi-mobile crushing station after reformation is as illustrated in Fig.3, where 1 are the main beams. 2 are the auxiliary beams. 3 is the receptacle trough.
The throat of new receptacle trough for ore after reformation is 140mm. And the throat of new receptacle trough for rock after reformation is 180mm. The crusher can be filled with ore or rock using the new feeding system. The output will be stable. The output of the ore will be 4000t/h. The output of the rock will be 6000t/h. The maximal discharging-material size of ore is 300mm before reformation. The maximal discharging-material size is 230mm when the throat is 140mm. The maximal discharging-material size of rock is 350mm before reformation. The maximal discharging-material size is 300mm when the throat is 180mm. These will raise the beneficiation capacity. These will reduce using scaleboard. This will save more operating expense. The full-scale mock-up model of one girder and the inner structure of one girder are as illustrated in Fig.4 and in Fig.5. (1) The autologous weight of the steel structure beams Because G=mg and m=ρv the weight of the steel structure beams can be obtained. Where m is the gross mass of the 16Mn steel plates. The ρ is the density of the 16Mn steel plate and ρ=7430kg/m 3 . The v is the volume of the beams. Through calculating the volume of the main beams is 2.3068 m 3 . If g=9.8N/kg we can have m=17139.5 kg and G=167967.3N.
Through calculating the volume of the auxiliary beams is 0.98314m 3 . If g=9.8N/kg we can have m=7304.7kg and G=167967.3N.
(2) The weigh of the carrying capacity Two EH3500 EV with in-wheel motor drives are on the steel structure beams. The autologous weight of the two EH3500 EV with in-wheel motor drives is 140t. The maximal carrying capacity is 190t. So the gross weight is 330t.

Summary
Using the transformed semi-mobile crushing station will reduce the cost of production immensely. And this will enhance the economic performance. The reformationed feeding syste has been tested. And it can meet the need of practice manufacture.