Development of technology for double-track swing stroke

Contents

Introduction

Input data and their brief characteristics

1 Shape selection and sizing of the workpiece cross section

2 Selection of fastener type and calculation of fasteners

3 Selection of rational production scheme

4 Substantiation of drilling and blasting system parameters and calculation of TRU passport

5 Calculation of drilling equipment capacity

6 Selection of diagram and calculation of ventilation passport

7 Calculation of harvesting equipment capacity

8 Cyclogram of penetration and organization of works

9 Technical and economic parameters of penetration

Conclusion

List of literature used

Introduction

Mining is an independent production process aimed at solving three main problems: destruction of rock mass, removal of rock mass outside the mining circuit, ensuring stability of the formed cavity. The process flow chart of the development includes engineering solutions on the technology of the development, placement of penetrating equipment in the development, selection and justification of the technologically possible sequence and duration of work, the number of penetrators of the required qualification, and technical and economic indicators.

Mining is carried out at all stages of preliminary and detailed exploration of the subsoil, as well as in underground mining. The largest part of the penetrating work is carried out during preliminary and detailed exploration. Of these, horizontal exploration workings (adits, tops, strokes and orts) account for 96-98%.

The piercing cycle consists of the following processes:

a) chipping (drilling and blasting - for rocks with a strength of f > 6): drilling, loading and blasting;

b) ventilation of the face (both in horizontal and in vertical workings);

c) loading and delivery;

d) attachment;

e) possibly, arrangement of drain groove, laying of rail track in horizontal workings or reinforcement of barrel, equipment of rebound.

The return (transport) dash is more economical, since part of the cost of laying the dash is paid off by the associated ore.

Source Data

The following initial data are selected for development of technology of double-track roll-back dash:

- ore density - 2800 kg/m3;

- design depth - 340 m;

- monthly penetration speed - 80 pm/month;

- HV length - 250 m;

- insignificant water inflow;

- service life of four years;

- fortress - 14.

Fortress f = 14, according to Protodyakonov's classification, between strong and very strong rocks - category II (very strong granite rocks: quartz porphyry, very strong granite, siliceous shale, less strong than the quartzites mentioned above; the strongest sandstones and limestones ).

1 Shape selection and sizing of the workpiece cross section

1.1 Determination of dimensions of the cross section of the workpiece

The dimensions of the cross section of the workpiece depend on:

- vehicle dimensions;

- number of rail tracks;

- permissible clearances;

- quantity of air passing through the production.

For recoil workings, the minimum cross-sectional area in the light is 9m2.

3 Selection of rational production scheme

Production in stable hard and ductile rocks that allow free exposure of the face and sides of the workings, and with a small influx of water, the usual methods of mining are used. Since rock strength f = 14, the only possible and effective method of production is drilling and blasting. Soil blasting is used for the backfill stroke carried out along the flat drop formation.

Guided by the penetration speed (80 pm/month), production is carried out according to a combined scheme - simultaneous erection of the support by the value of the face for a cycle using a shield-shell immediately after loading the rock. This is facilitated by the high mechanization of the process of manufacturing the sprayboard support .

Daily performance:

l = L/(T·η) = 80/30 = 2.7 m, where

L = 80 pm/month - penetration speed;

T = 30 days - number of working days per month.

4 Substantiation of parameters of drilling and blasting complex and

Calculation of TRU passport

4.1 Explosive Selection (BB)

We accept in our work as an explosive ammonite rock No. 1. The selection takes into account rock strength (f > 14) and watering (low watering).

Based on performance

4.6 Drilling Pattern

The type of cut is direct prismatic.

The design of the charge is a concentrated column.

Initiation - Direct.

Number of holes:

- in-tube - 4 pcs.;

- baffles - 8 pcs.;

- outlining - 14 pcs.;

- for drain groove - 1 pc.;

- total number of holes - 27 pcs.

7 Calculation of harvesting equipment capacity

Depending on the mining-geological and production-technical factors, the type of loading machine is chosen. When conducting mining and exploration workings, bucket-type loading machines, continuous machines, bracing units and loading and transportation machines are used.

When selecting a loading machine, consider:

- dimensions of working in cross section;

- angle of working inclination;

- rock strength;

- size of broken pieces of rock;

- dimensions and parameters of the loading means.

For bucket-type machines on the rail, the loading front must be equal to or greater than the width of the work. In caterpillar and pneumatic wheeled vehicles, the loading front is not limited.

7.1 Selection of cleaning equipment

In this work PPM4U is selected. Designed to load the rock mass separated from the massif into vehicles during inclined rectilinear mine workings from top to bottom along the drop with an inclination angle of not more than 18 °.

- technical capacity 1,32m3/min;

- loading front 4.0m;

- ladle capacity 0.35m3;

- height with raised bucket 2.35m;

- length with lowered bucket 8.2m;

- electric drive;

- machine drive power 14 kW;

- conveyor drive power 7.5 kW;

- weight 11.6.

8 Cyclogram of penetration and organization of works

The penetration cycle during horizontal and inclined workings in strong and medium strength homogeneous rocks by drilling and blasting method consists of the following main processes:

- drilling of holes, their loading and blasting of explosive charges;

- ventilation, inspection and bringing the face to a safe state;

- loading and transportation of rock;

- erection of permanent support;

- auxiliary processes:

- laying of rail tracks or extension of conveyor;

- water drain groove arrangement;

- increase of ventilation pipes rates;

- laying of pipes and cables;

- illumination of the face and mining;

- marketing services;

- monitoring of the state of the mine atmosphere .

The main penetrating work is carried out by a team of penetrators, the rest of the auxiliary work is carried out by a team of miners as necessary.

The main passing work is carried out by a team of penetrators consisting of 6 people. Organization of work - two-shift. Production takes place 94 working days.

The cycle begins with bringing to a safe state of the face, one penetrator performs. It takes 10 minutes to bleed air, and 15 minutes to depopulate the face. Then the penetrators begin drilling holes, which are in a set of 27 pieces with a depth of 1.6 meters. These operations take 1.3 hours. Delivers the necessary explosive materials, together with an assistant, mass - 25, 75kg of rock ammonite No. 1 and other equipment from the distribution warehouse in a period of 20 minutes. Charging is carried out manually. Electric network is assembled and connected to 1/100 KVP machine. Hides to a safe place and explosions a slaughter. It all takes 40 minutes. Ventilation is carried out for 30 minutes at pressure scheme. At this time, the shift is resting. Ventilation pipes are increased every 4 shifts.

Rock is harvested by PPM4U during 129 minutes.

Conclusion

In the course of this course project, I learned to solve the issues related to the holding and fixation of mine workings, the organization of labor, learned to use the technical literature that was used by me during the course project, and the literature was useful in conducting calculations, learned to correctly select parameters, coefficients and other important data.

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