RU2317415C1 - Method for stripping and production performing with the use of pit machine of milling type and scrapers - Google Patents

Abstract

FIELD: mining, particularly to perform stripping and mining in pits with 6-8 crushing index.

SUBSTANCE: method involves filling previously created trench with rock loosened with milling machine, wherein loosened rock is poured in the trench from which said rock had been excavated. In the case of conveyer deactivation device usage rock is left in open trench just after rock cutting with milling means. After that rock is scooped with scrapers following pit machine without pit machine stopping.

EFFECT: increased open-pit work efficiency due to decreased milling machine downtime during rock mining.

2 cl, 1 ex, 4 dwg

Description

The invention relates to the mining industry and can be used when performing overburden and mining operations in quarries with a rock strength coefficient of up to 6 ... 8 units on the M. M. Protodyakonov scale using milling type quarry harvesters.

There is a method of overburden operations using the explosion of a quarry array, followed by scooping up the blasted rock with an excavator bucket and transporting it using dump trucks to the dumping site. (Reference book. Open cast mining / K.N. Trubetskoy et al. - M.: Mining Bureau, 1994, p. 426-432).

The disadvantages of this method are the low technical and economic indicators associated with high costs for drilling and blasting, dilution of minerals in complex fields and the danger of mining.

As the closest analogue, a method has been adopted for developing mineral deposits using milling type mining combines and dump trucks. By this method, it is possible to conduct efficiently selective mining of minerals in complex structural deposits, and in addition, there is no need for expensive, hazardous and environmentally hazardous blasting operations. (Pankevich Yu.B., Hartman G. Operational experience of mining combines SURFACE MINER of WiRTGEN firm on gypsum quarries of the world. Mining industry No. 1, 1997, p. 4-9; Karlykhanov F.V., Levochkin V.F., Pankevich Yu. .B., Hartman G., Dolgushin VD Use of the Wirtgen 2100 SM mining machine for the extraction of flux raw materials. Mining, No. 1, 1998, p. 38-39).

The disadvantage of this method is the reduction in productivity of the work performed by an average of 20% due to the downtime of the mining milling combine when replacing dump trucks.

The technical problem to which the invention is directed is to increase the productivity of open cast mining by reducing the downtime of quarry milling combines during excavation of rock from the massif.

The task is achieved in that the rock loosened by the quarry milling combine is dumped by the conveyor of the combine’s unloading console into the same trench from which it was removed, and if there are devices that disconnect the conveyors, the rock immediately after breaking with the cutter is left in the open trench from which it is scooped up, following the combine and without stopping the combine itself. If it is necessary to selectively extract minerals in complex structural deposits, the overburden is scooped up from the trench developed by the combine, and the mineral is loaded using the conveyor of the unloading console of the combine into the dump truck body, which goes to the side of the axis of movement of the combine.

Differences from the closest analogue are in a number of essential features:

- Scrapers are included in the set of machines for removal and transportation;

- there is no rigid technological connection between the scraper and the quarry milling combine loading vehicles using a conveyor on the unloading console of the combine;

- in case of selective mining, the conveyor of the combine alternately unloads the rock into the body of the dump truck or vice versa, into the trench developed by the mill of the combine.

The essence of the proposed method of stripping and mining using quarry milling machines and scrapers is illustrated by drawings, where figure 1 shows a diagram of the work with the arrangement of machines in the combine harvester - scraper, side; figure 2 is a diagram of the work with the arrangement of machines in the combine harvester - scraper, plan; figure 3 - scheme of work during selective excavation with the arrangement of machines in the set combine harvester - scraper - dump truck, side; figure 4 - scheme of work during selective excavation with the arrangement of machines in the set combine harvester - scraper - dump truck, plan.

An example implementation of the method.

In overburden operations, as well as mining operations with a high formation capacity with a mineral and low dip angles, the quarry milling combine 1 is the head machine in the kit and the cutter 2 destroys the rock, Figs. 1, 2. The rock destroyed by the cutter enters the conveyor belts of the quarry milling the combine and through the conveyor belt of the unloading console 3 is poured back into the trench formed by the cutter 2. In the event that the combine has a device for removing the conveyor belts from under the load from the cutter side 2, t o in order to save energy, it is advisable to skip the destroyed rock 4 under the combine. Scrapers 5 following the quarry milling combine harvester scoop up the destroyed rock 4 and transport it to the dumping site. Since the scrapers 5 are loaded with the destroyed rock 4 independently and independently of the combine, the combine works without stops and thereby increases the productivity of open cast mining.

During mining operations on complex structural deposits, the quarry milling combine 1 is also the head machine (Figs. 3, 4) and destroys both empty waste 4 and mineral 6. The destroyed overburden 4 passes either through the conveyor belt of the combine and through the conveyor unloading console 3 is poured into the trench formed by mill 2, or passed under the combine. Overburden in quarries is usually larger than mineral, therefore scraper 5, following the combine 1, scooped up the destroyed rock. Mineral 6 destroyed by mill 2 enters through the discharge console 3 turned to the side and into the body of the dump truck 7, going to the side of the quarry milling combine 1. Since the replacement of dump trucks 7 is possible while overburden 4 is being mined, the combine 1 can work without stops and thereby increase productivity.

According to the proposed method of conducting overburden and mining operations using milling type mining combines and scrapers, it is possible to reduce combine downtime associated with the replacement of dump trucks, and thereby increase the productivity of open cast mining by 14 ... 28%.

Claims (2)

1. The method of conducting overburden and mining operations, including the use of milling type open-cut miners for loosening the rock, characterized in that the rock loosened by the open-cut milling combine is dumped by the conveyor of the unloading console of the open-cut milling combine into the same trench from which it was removed, and if disconnecting Conveyors of a quarry combine of devices to the rock immediately after destruction by a milling cutter are left in an open trench, from which it is scooped up by scrappers following the combine and without combine stops. 2. The method of conduct according to claim 1, characterized in that during selective mining of minerals in complex structural deposits, the overburden is scooped up from the trench developed by the combine, and minerals are loaded using the conveyor of the unloading console of the combine into the dump truck body, going to the side of the axis of movement of the combine .

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