Flexible tractive tool of mine winding plant

FIELD: mine winding plants, particularly to lift skips and cages from deep mines and pits.

SUBSTANCE: tractive tool is made as flexible flat band having trapezoid shape and constant thickness. Flexible flat band width varies in accordance with predetermined algorithm. The band has minimal width in area of band connection with lifting tank.

EFFECT: possibility to increase winding plant capacity for reduced tractive tool weight value.

2 cl, 4 dwg

 

The invention relates to equipment mining hoist and is intended for use as a traction unit for lifting skips and cages mainly from deep mines (1000 m or more), and also for lifting the skip from the deep pit.

You know the run of the traction unit of the mine hoisting plant in the form of a steel round flexible cables, the cross section of which is selected for the vanishing points of the rope guide pulley, given a static safety factor [Pravicy NICHOLAS Mine hoisting installation. M, Gosgortechnadzor 1963 p.68. Uniform safety rules for the development of ore, rock and placer deposits of minerals by underground mining. PB 03-553-03, M., NGOs MBT 2003].

In the section of the traction unit, located at the vanishing point with the guide pulley operates tearing force of the weight of the loaded vessel and the weight of the traction unit from the vanishing points to the place of its attachment to the vessel. In the sections below vanishing points, tearing forces are reduced by the amount of the weight of the traction unit, located above these sections before vanishing points. This leads to the fact that with the constant cross section of the traction unit static factor of safety in these sections increases as the distance from the vanishing points, and increases the consumption [Pravicy NICHOLAS Mine lifting the stop. M: Gosgortekhnadzor, 1963, p.74]. For deep mines, on the one hand, the weight of such ropes is commensurate with the weight of the vessel, on the other hand, the weight of lifted load (including the weight of the tape) is limited by the drive power of the hoisting unit.

The value of reduction of excessive consumption of rope, you can increase the weight lifted payload, and hence the performance of deep lifts.

Therefore, these ropes with high intensity, have excess weight, thereby reducing the useful weight of lifted load.

Known traction unit for lifting installations in the form of a flat steel strip of constant width and thickness [Aearobic. Lifting installation tape traction body. - M.: Mashinostroenie, 1980, str, RES]. However, with constant cross-section ribbon static factor of safety in these sections increases as the distance from the vanishing points, and increases the intensity. For deep mines, on the one hand, the own weight of these bands are comparable with the weight of the vessel, on the other hand, the total weight of lifted load and the traction is limited by the drive power of the hoisting unit.

Therefore, such films having a high intensity, as well as similar, have excess weight, thereby reducing the useful weight podnimaem the cargo.

A common feature of the prototype is the implementation of the traction unit in the form of a flexible flat ribbon of constant thickness, one end of which is fixed to the body of the winding, and the other for lifting the vessel.

Solved by the invention, the task of reducing the material intensity of the traction body, providing any section of the permanent static factor of safety, and productivity of lifting equipment on the value of the reduced weight of the traction unit.

The technical result of the invention consists in the provision of the minimum permissible dynamic loads in the towing authority by executing it with the lowest possible weight and with a minimum static factor of safety.

The technical result is achieved by the fact that the flexible traction body of the mine hoisting plant, made in the form of a flexible flat ribbon of constant thickness, one end of which is fixed to the body of the winding, and the other for lifting the vessel according to the invention the traction body in the form of a flexible flat belt of trapezoidal form with a provision in any section of the permanent static factor of safety by running it with the minimum width of its end fixed to the lifting vessel, satisfying the condition:

where

M is the mass of the cargo at the end of the tape, kg;

g - free fall acceleration, m/s2;

z - static factor of safety;

σ - temporary tear resistance, PA;

t - tape thickness, m;

and its width ini+1in any cross-section that satisfies the conditions:

yi+1=yi+Δyi+1,

where

yi- the width of the ribbon in the previous section, m;

Δyi+1- the i-th increment of the width of the tape, m;

Δx - length of the tape into sections, m;

ρ is the density of the tape material, kg/m3;

Si- the cross-sectional area of the previous section belt m2;

Si+1- the cross-sectional area of the subsequent section of the ribbon, m2..

The best result is achieved if the execution of the traction unit in the form of a flexible flat belt in the form of a rectangular or raveboy line.

Execution of the traction unit in the form of a flexible flat belt of trapezoidal shape will reduce the intensity of the rope and to increase weight lifted payload hoisting unit.

Execution of the traction unit in the form of a flexible, such as steel, flat ribbon of constant thickness, with variable throughout the length of the width equal to the height of the boom, so that at any cross-section provides the tsya constant static factor of safety, allows you through the significant reduction in the material intensity of the traction unit to significantly improve the performance of lifting equipment deep mines on the value of the reduced weight of the traction unit.

Reducing the width of the tape along its length can be made either in the form of a rectangular trapezium, or raveboy line, creating in one case, an asymmetric design of the traction unit, and the other symmetrical design of the traction unit about an axis directed along the length of the tape.

Asymmetric tape is easier to manufacture, since the excess width is removed from one side, the other side remains smooth and easier to put on the reel.

The symmetrical design of the tape is more difficult to manufacture, however, winding it on the reel occurs without deviation across the width of the reel.

The implementation of flexible flat ribbon with widthi+1in any cross-section that satisfies the conditions:

yi+1=yi+Δyi+1,

where

yi- the width of the ribbon in the previous section, m;

Δyi+1- the i-th increment of the width of the tape, m;

Δx - length of the tape into sections, m;

ρ is the density of the tape material, kg/m3;

Si- the cross-sectional area of the previous section belt m2;

Si+ - the cross-sectional area of the subsequent section of the ribbon, m2,

allows you to reduce its consumption and significantly improve the performance of lifting equipment in deep mines.

Known speed steel rope with decreasing number and diameter of wires used for deep mines [Pravicy NICHOLAS Mine hoisting installation. M: Gosgortekhnadzor, 1963, page 76, RES, a, b]. Known sign, partially similar to the distinguishing feature of the claimed device. However, in these ropes static factor of safety decreases with each subsequent stage of the rope.

Precisely because the rope speed, it does not provide it in any section of the permanent static factor of safety, possesses excessive material consumption. In addition, the traction body round, but with variable cross-section in the form of a rope difficult to implement, as it requires each individual wire of variable cross-section, strand them in strands, then in the rope.

In the invention, unlike known solutions, traction unit with variable cross-section depending on its length made in the form of a flexible flat belt of trapezoidal shape with a constant thickness and with provision in any section of the permanent statistical factor of safety, the minimum width Le is you, providing the specified factor of safety, taken in connection with its lifting vessel, which can significantly improve the performance of lifting equipment on the value of the reduced weight of the traction unit and to eliminate the possibility of breakage of the traction unit.

Thus, the unknown impact of the distinctive features on the technical result achieved proves the compliance of the claimed group of inventions condition of patentability "inventive step".

The invention is illustrated by drawings.

Figure 1 shows the external view of the flexible traction body of the mine hoisting plant, made in the shape of a rectangular trapezium, fastened to the body of the winding, the maximum width of its end, and by lifting the vessel - end with minimum width.

Figure 2 presents the calculation scheme to determine the width of the flexible flat belt.

Figure 3 calculation circuit flexible traction body of the mine hoisting plant, made in the form of a rectangular trapezoidal shape (asymmetric traction unit).

Figure 4 calculation circuit flexible traction body of the mine hoisting plant, made in the form raveboy line (symmetrical traction unit).

Vertical shaft with the proposed traction body 3, 4 includes: traction body in VI is e tape 1, one end of which is fixed on the lifting vessel 2, the opposite end attached to the body of the winding 3 in the form of a bobbin winding plant, where N0the depth of the shaft together with the height of copra (not shown).

The minimum width of the tape has taken the place of fixing her with a lifting vessel

y0=M·g·z/σ·t

where M is the mass of the cargo and the vessel at the end of the tape, kg;

g - free fall acceleration, m/s2;

z - static safety factor applied in accordance with article 319 of Uniform safety rules for the development of ore, rock and placer deposits of minerals by underground mining. PB 03-553-03;

σ - ultimate strength of the material of the ribbon, PA;

t - tape thickness, m

The width of the ribbon in any section (2)

yi+1=yi+Δyi+1

where Δyi+1the increment of the width of the tape, m;

thei- the width of the ribbon in the previous section, m

where Δx is the length of the tape into sections, m;

ρ - the density of steel, kg/m3;

Si- the cross-sectional area of the previous section belt m2.

The cross-sectional area of the subsequent section of the ribbon, m

Traction unit operates as follows. When the movement of the body of the winding 3 (reel) on the rise of the vessel 2 up, tape the 1 wound on a bobbin, and in the vanishing point of the tape from the reel to a constant static factor of safety, since the width of the ribbon is made variable in accordance with a specified algorithm changes the width, satisfying the condition

yi+1=yi+Δyi+1

where

thei- the width of the ribbon in the previous section, m;

Δyi+1- the i-th increment of the width of the tape, m;

where

Δx - length of the tape into sections, m;

ρ is the density of the tape material, kg/m3;

Si- the cross-sectional area of the previous section belt m2;

Si+1- the cross-sectional area of the subsequent section of the ribbon, m2;

The calculations for mine hoisting depth of 1000 m showed that the application of the traction unit in the form of a flexible flat belt of trapezoidal shape with a constant thickness, a savings of metal on the towing authority within 20%, which allows to increase by the same value of the limit load, increasing the performance of a hoist.

Thus, the proposed traction body in the form of a flat belt of trapezoidal form, made according to a certain algorithm, reduces the intensity of the traction unit, provides in any section of the permanent static factor of safety, allows the led is the performance of lifting equipment on the value of the reduced weight of the traction unit.

1. Flexible traction body of the mine hoisting plant, made in the form of a flexible flat ribbon of constant thickness, one end of which is fixed to the body of the winding, and the other for lifting the vessel, characterized in that the traction body in the form of a flexible flat ribbon of constant thickness trapezoidal shape with variable throughout the length of such width that in any cross section is a constant static factor of safety, and the minimum width of its end fixed to the lifting vessel satisfies the condition:

where M is the mass of the cargo at the end of the flexible flat belt, kg;

g - free fall acceleration, m/s;

z - static factor of safety;

σ - temporary tear resistance, PA;

t is the thickness of the flexible flat belt, m;

calculation of the width yi+1flexible flat ribbons in any section:

yi+1=yi+Δyi+1;

where yi- the width of the flexible flat belt in the previous section, m;

Δyi+1- the i-th increment of the width of the flexible flat belt, m;

Δx - length flexible flat ribbon into sections, m;

ρ - the density of the material of the flexible flat belt, the g/m 3;

Si- the cross-sectional area of the previous section flexible flat belt, m;

Si+1- the cross-sectional area of the subsequent section of the flexible flat belt m2.

2. Traction unit according to claim 1, characterized in that the flexible flat ribbon made in the form of rectangular or raveboy line.



 

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