SU1404657A1 - Water-filled stopping for damping air shock wave - Google Patents

Abstract

The invention relates to the mining industry. The purpose of the invention is to increase the efficiency of damping a shock air wave by increasing the time of its interaction with the jumper. Made in the form of a pipe, the elastic capacitance (E) 1 has the shape of a spiral with a variable diameter of turns. Each coil is provided with fastener elements in the form of sliding rings 2, by means of flexible couplings attached to the wedges 4, which are installed in the excavation holes 5. Before an explosion, E 1 is filled with water and destroyed by the impact of an air wave. The process of destruction is extended in time due to the location of the jumper along the length of the excavation, which leads to an effective attenuation of the air shock wave. 2 Il. with fS

Description

II and

05 JV

1

The invention relates to the mining industry and can be used to dampen shock air waves generated during the mass cutting of mineral ores.

The purpose of the invention is to increase the efficiency of damping a shock air wave at the expense of increasing the time of its interaction with a bar.

FIG. 1 shows the lintel installed in the mine workings, open, view; in fig. 2 is a view A of FIG. one.

The water filled bridge for extinguishing a shock air wave consists of an elastic tank-shaped container 1 and has the shape of a spiral with a variable diameter of the turns. The coils of the helix are provided with sliding rings 2, which, by means of flexible couplings 3, are attached to the wedges 4 installed in the bore-holes drilled in the roof and walls of the working 5. The ends of the elastic tank 1 are attached to the roof of the working 5 so that they are higher than the turns spirals to ensure that the entire elastic tank 1 is filled with water. Before the explosion, the elastic container 1 is filled with water.

A water filled jumper to dampen the shock air wave works next.

Under the impact of the air blast, the elastic container 1 attached by means of sliding rings 2 and flexible connections 3 to the wedges 4 installed in the roof and walls of the excavation 5 is destroyed. The process of destroying the web is extended in time, since it is located along the length of the mine. This leads to a more effective attenuation of the air shock wave. The water enclosed in the bridge is converted into a stream of droplets of various sizes. These droplets move in the air and carry the impulse that the air shock imparted to them. Moving in the air, the drops decelerate the vehicle and in turn transmit to the air the entire impulse received from the primary shock air wave. As a result, a secondary shock wave arises in the air.

ten

15

20

25

thirty

35

40

One of the main parameters of the bulk water bridge is the mass of water placed in the bridge, therefore the length of the elastic container should be determined from the following relationship:

, 2,4- (I, 2R ×) (K -1) L-

where S is the production area, where

jumper installed, R - distance from charge to jumper

m;

p - coefficient taking into account the mass of explosive gases flowing into the production where the jumper is installed; q is the mass of explosive explosives, kg; K is the pressure attenuation coefficient at the front of the shock air wave;

d is the diameter of the elastic tank, m. For example, it is necessary to calculate the length of the elastic tank for the following conditions. The cross-sectional area of the haulage output is 6.0 m. The mass of the explosive charge is BB-1066 kg, the distance from the charge to the jumper is 4 .m. 0.8 m, the magnitude of the coefficient taking into account the mass of the VV gases flowing into the production has been established experimentally and is 05 for well charges and 1 for chamber charges.

The pressure attenuation coefficient at the front of a shock air wave is defined as the ratio

1 DR | ,

 where DR is the pressure at the front of the shock air wave acting on the jumper, kPa; required pressure at the front of a shock air wave after it was weakened by a jumper, kPa Pressure at the front of a shock air wave generated by the explosion of a well-charged explosive charge in the immediate vicinity of

having smaller parameters than the primary one, the stability of the latter is equal to DR 2000 kPa.

ma wave This is due to the loss of energy of the primary air shock wave to the destruction of the jumper, the spraying of water droplets, the heat exchange between water and explosion gases, etc.

It is advisable to install a water-filled jumper in the immediate vicinity of explosive charge, since high pressure at the front of the shock air wave improves the fragmentation of water into droplets and its spraying, and the high temperature of the explosion gases contributes to the most intense heat exchange between hot gases and sprayed water, which increases quenching shock air waves.

Since the production is fixed by a metal arch support, the breaking pressure for which is 150 kPa, DP2 is assumed to be 140 kPa. Then

50

TO

DR |

DR2

 14.3.

55

With the foregoing, the length of the elastic capacity is equal to

2.4. (l, 24-fO .- 1066). (14, 3M)

3.14-0.8- 19.9 m

One of the main parameters of the water filled bulkhead is the mass of water placed in the bulkhead, therefore the length of the elastic container should be determined from the following relationship:

0

five

0

five

0

five

0

, 2,4- (I, 2R ×) (K -1) L-

where S is the production area, where

jumper is installed, R is the distance from charge to jumper,

m;

p - coefficient taking into account the mass of explosive gases flowing into the production, where the jumper is installed; q is the mass of explosive explosives, kg; K is the pressure attenuation coefficient at the front of the shock air wave;

d is the diameter of the elastic container, m. For example, it is necessary to calculate the length of the elastic container for the following conditions. The cross-sectional area of the haulage output of 6.0 m is the mass of the explosive charge BB-1066 kg, the distance from the charge to the jumper 4. M, the diameter of the elastic tank is 0.8 m, the magnitude of the coefficient taking into account the mass of the VV gases flowing into the production experimentally and is, 05 for wellbore charges and, 1 for chamber charges.

The pressure attenuation coefficient at the front of a shock air wave is defined as the ratio

1 DR | ,

 where DR is the pressure at the front of the shock air wave acting on the jumper, kPa; required pressure at the front of a shock air wave after it was weakened by a jumper, kPa Pressure at the front of a shock air wave generated by the explosion of a well-charged explosive charge in the immediate vicinity of

From the value of the latter is equal to DR 2000 kPa.

The value of the latter is equal to DR 2000 kPa.

Since the production is fixed by a metal arch support, the breaking pressure for which is 150 kPa, DP2 is assumed to be 140 kPa. Then

TO

DR |

DR2

 14.3.

With the foregoing, the length of the elastic capacity is equal to

55

2.4. (l, 24-fO .- 1066). (14, 3M)

3.14-0.8- 19.9 m

Claims (1)

The invention The water-filled jumper for extinguishing a shock air wave, including an elastic tank installed in a mine working, filled with water, and the fastening elements of the tank in a mine working, characterized in that, in order to increase the efficiency of damping , - .. -, X // ////////////////// / 7 / FIG. g air waves by increasing the time of its interaction with the jumper; elastic capacity is made in the form of a tubular helix with a variable diameter of turns, and fasteners are made in the form of sliding rings with flexible connections that are installed on each turn of the tubular helix. In id