Method of defining of industrial explosive relative working efficiency

FIELD: explosives.

SUBSTANCE: invention can be used in mineral resource industry for testing of industrial explosives (EC) made at the places of their use. The proposed method includes location of EC charge into shell cavity, EC charge blasting in it, defining the volume of extended cavity and calculation of relative working efficiency of EC charge. As the shell there used is steel seamless pipe with diametre not less than 50 mm, wall thickness not less than 5 mm and length not less than 10 charge diametres. Over the pipe at a distance of 0.54-0.60 of charge length away from initiation beginning there tightly arranged is gauging ring made of steel 45 with diametre not less than 150 mm, height 30-50 mm. Note that there performed is the blasting of EC tested charge and 6ZHV ammonite charge as reference one and there defined are the changed volumes of inner cavities of gauging rings of tested and reference EC charges. The calculation of explosive working capacity is performed in relation to the volumes of inner cavities of gauging rings of tested and reference EC charges after explosion. Note that additionally there measured is EC charge detonation speed for detonation process completeness control.

EFFECT: provision of relative working capacity defining of modern industrial large particle explosives.

1 tbl, 12 ex

 

The invention relates to explosive and can be used in the mining industry for testing of industrial explosives), made on the ground of their consumption.

Modern commercial EXPLOSIVES, made on the ground of their consumption, mainly consists of a mixture of granulated ammonium nitrate with flammable additives or emulsion. Typically, this coarse mixture with low sensitivity to detonation impulse and a large critical diameter (more than 30 mm steel shell). Explosive characteristics of such compositions, including relative performance, not always known, although should be considered when calculating the parameters of blasting operations.

There is a method of determining the relative health by detonation of the explosive charge in the shell or without her, and measurement of air shock waves (performance Evaluation and completeness of explosive transformation of emulsion explosive compositions / Vasenin, Spodarev, Rship // FGV, 1998, CH, No. 5, pp.118-121). However, the conditions of the explosion of the explosive charge in the air are different from the conditions of the explosion of the charge, surrounded by rocks, so the measured characteristics may differ from those actually possible.

Closest to the claimed method the distribution of the relative health of explosives is blasting explosive charge in the cavity of the lead sheath (Lowdose, Nesbakken, Ahirman. Industrial explosives. M.: Nedra. - 1988. - s-315). The explosive charge weight of 10 g in a paper sleeve with a diameter of 24 mm is placed in the cavity of the lead shell, with a known volume. After the explosion, measure the changing volume of the cavity. The difference amounts to Bang and after is the numerical health value of the test CENTURIES. Since the amount of expansion of the volume of the cavity of the lead sheath is not in a linear relationship with the truth of health, obtained by this method results characterize the relative efficiency: compare them with the performance of, for example, crystalline TNT adopted as the standard.

The disadvantage of this method is the need to use charges in diameter that do not provide the complete flow of the detonation process coarse CENTURIES. In addition, the known method does not allow to control the completeness of flow of the detonation process, since it does not provide the possibility of measuring the velocity of detonation of the explosive charge.

The present invention is directed to solving the problem of determining the relative efficiency of modern industrial coarse CENTURIES, made on the ground of their consumption.

The problem is solved in that in the known method of determining the relation is sustained fashion health explosives, including the location of the explosive charge in the cavity of the shell, the blasting explosive charge in it, the determination of the volume of the enlarged cavity and the calculation of the relative health of EXPLOSIVES, according to the invention as a membrane used seamless steel pipe with a minimum diameter of 50 mm with wall thickness not less than 5 mm and a length of at least 10 diameters of charge, over which at a distance of 0.54-0.60 length of the charge from the beginning of the initiation tightly place the measuring ring, made of steel 45 with a diameter of not less than 150 mm, a height of 30-50 mm, perform the test explosion of the explosive charge and the charge of the Ammonite IV as a reference, determine the changed the volume of internal cavities measuring rings of the test and reference explosive charge and the calculation of the relative health of EXPLOSIVES carry out volumes expanded after the explosion of the internal cavities of the measuring rings of the test and reference explosive charge, and additionally measure the velocity of detonation of the explosive charge to monitor the completeness of the detonation process.

Detonation of the charge mixed coarse explosives manufactured at the place of its use, is placed in a steel shell with a diameter of not less than 50 mm, is complete with a speed corresponding stationary detonation process, which indicates Ave is improving the critical diameter of detonation. The blasting charge in a steel shell with a diameter less than 50 mm does not achieve stationarity detonation, as evidenced by the low process speed, close to deflagration burning.

Use as shell seamless steel pipe with wall thickness not less than 5 mm reduces the critical diameter of detonation of the test CENTURIES and simulates the blasting charge surrounded by rocks. The use of shell wall thickness less than 5 mm does not ensure the development of stationary detonation process that produces the maximum energy release of the explosion.

The use of shell length of at least 10 diameters of the charge allows measurements of the expansion ring at a distance of more than 5 diameters of charge from the beginning of the initiation, which excludes the impact of the intermediate detonator on the measured characteristics.

The placement of the rings on the shell with the explosive charge is determined by the maximum effect of the impulse of the explosion on the side surface. When placing the ring at a distance of less than 0.54 length of the charge from the beginning of the initiating impulse of the explosion on the side surface of the shell has not yet reaches the maximum value. When placing the ring at a distance of more than 0.6 of the length of the charge effect of the impulse of the explosion is reduced.

Steel 45 has a fairly significant amount relates is a high elongation (16%) and high resistance to tear (61 kg/mm 2that allows to achieve the destruction of the ring when the explosion of the explosive charge.

The use of rings with a diameter of less than 150 mm does not ensure the integrity of the ring in the explosion, resulting in efficiency in this way cannot be calculated.

The height of the ring is also caused by the need to preserve its integrity. At the height of the ring is less than 30 mm maybe its destruction due to a sharp impact explosive impulse. At the height of the ring more than 50 mm longer time of exposure to the explosive impulse, which also leads to the destruction of the ring.

Use as a standard charge of Ammonite GW due to the wide use of it in the practice of mining. In addition, this BB prefabrication and its characteristics are stable.

The relative efficiency is calculated in terms of volume of internal cavities of the rings after the explosions of the test and reference charges.

Measurement of velocity of detonation on a plot measuring ring allows control of the flow of the detonation process, stationarity of the distribution which is the maximum energy release. The numerical value of the velocity of detonation individually and depends, including the type of explosives and the presence of the shell. For coarse industrial EXPLOSIVES, the type of pellet is consistent ammonium nitrate with non-explosive combustible additives, this value is in the range from 2600 to 3600 m/S.

The essence of the proposed method and the achieved results can be more clearly explained by the following examples.

When implementing the method as a wrapper used seamless steel pipe (in Example 11 - pipe with welded joint), measuring the ring of steel 45 (Example 3 steel 3) height 50 mm (Example 5 ring height 70 mm, in Example 10, the height of the ring 20 mm) and a diameter of 150 mm (Example 4 ring diameter 130 mm). Undermining the charge is carried out using the intermediate detonator placed in the shell on top of the explosive charge. The boundary surface between the explosive charge and the intermediate detonator take over the plane of initiation. After the explosion, measure the volume of the internal cavity ring VBBand expect the relative performance CENTURIES as the ratio of VBBto the volume of the internal cavity of the ring after the explosion of the Ammonite GW (VI), which is equal to 340 cm3.

As a test subject using composite EXPLOSIVES local manufacturing granulite-MPG.

Example 1.

In pipe length 700 mm (~13 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 600 mm on Top of the shell at a distance of 324 mm from the plane of initiation, which is 0.54 length of charge (~6 diameters of charge), firmly place the measuring ring.

Detona the Oia full charge, the detonation speed of 3600 m/s Measuring ring remained intact, the volume of the internal cavity (VBB) increased to 260 cm3.

The relative performance is 0,77.

Example 2.

In pipe length 1000 mm (~19 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 900 mm on Top of the shell at a distance of 540 mm from the plane of initiation, which is 0.60 length charge (~10 diameters of charge), firmly place the measuring ring.

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring remained intact, the volume of the internal cavity (VBB) increased to 260 cm3.

The relative performance is 0,77.

In Examples 3-11 when implementing the method is used transcendent values. Example 12 the prototype.

Example 3.

In pipe length 900 mm (~17 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 760 mm on Top of the shell at a distance of 433 mm from the plane of initiation, which is 0.57 length charge (~8 diameters of charge), firmly place the measuring ring of steel 3.

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring when the explosion had collapsed.

The relative efficiency cannot be calculated.

Example 4.

In pipe length 900 mm (~17 d is of amerov charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 760 mm on Top of the shell at a distance of 433 mm from the plane of initiation, which is 0.57 length charge (~8 diameters of charge), firmly place the measuring ring with a diameter of 130 mm

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring when the explosion had collapsed.

The relative efficiency cannot be calculated.

Example 5.

In pipe length 900 mm (~17 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 760 mm on Top of the shell at a distance of 433 mm from the plane of initiation, which is 0.57 length charge (~8 diameters of charge), firmly place the measuring ring height 70 mm

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring when the explosion had collapsed.

The relative efficiency is not possible to calculate.

Example 6.

In pipe length 700 mm (~13 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 600 mm on Top of the shell at a distance of 300 mm from the plane of initiation that is 0.50 length charge (~6 diameters of charge), firmly place the measuring ring.

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring remained intact, the volume of the internal cavity (VBB) Uwe is icilda and 240 cm 3.

The relative efficiency is equal to 0.71.

Low and distinct from the obtained in Examples 1 and 2 values relative health due to the fact that in this position the ring impulse of the explosion on the side surface of the shell has not yet reaches the maximum value. Therefore, this value of the relative health does not characterize the investigated explosive.

Example 7.

In pipe length 1000 mm (~19 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 900 mm on Top of the shell at a distance of 630 mm from the plane of initiation, which is 0.70 length of charge (~10 diameters of charge), firmly place the measuring ring.

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring remained intact, the volume of the internal cavity (VBB) increased to 245 cm3.

The relative efficiency is equal to 0.72.

Low and distinct from the obtained in Examples 1 and 2 values relative health due to the fact that in this position the ring the action of the impulse of the explosion is reduced, which immediately affects the extension ring. Therefore, this value of the relative health does not characterize the investigated explosive.

Example 8.

In pipe length 700 mm (~13 Dimitrovgrad), with a wall thickness of 2 mm placed the explosive charge, whose length is 600 mm on Top of the shell at a distance of 324 mm from the plane of initiation, which is 0.54 length of charge (~6 diameters of charge), firmly place the measuring ring.

Detonation of the charge is not full, the speed of detonation is impossible to measure. The volume of the internal cavity of the measuring ring remained unchanged.

The relative efficiency cannot be calculated.

Example 9.

In pipe length 500 mm (~9 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 400 mm on Top of the shell at a distance of 228 mm from the plane of initiation, which is 0.57 length charge (~4 charge diameter), firmly place the measuring ring.

Detonation of full charge, the detonation speed of 4200 m/s Measuring ring remained intact, the volume of the internal cavity (VBB) increased to 310 cm3.

The relative efficiency is equal to 0.88.

High and different from the above values of relative health due to the fact that in this measurement the velocity of detonation is much higher due to the large influence of the intermediate detonator. Therefore, this value of the relative health characterizes not the properties of the investigated explosives and characteristics Prohm is the filling of the detonator.

Example 10.

In pipe length 900 mm (~17 diameters of charge), with a wall thickness of 5 mm is placed the explosive charge, whose length is 760 mm on Top of the shell at a distance of 433 mm from the plane of initiation, which is 0.57 length charge (~8 diameters of charge), firmly place the measuring ring height 20 mm

Detonation of full charge, the detonation speed of 3600 m/s Measuring ring when the explosion had collapsed.

The relative efficiency cannot be calculated.

Example 11.

As the shell use a pipe with welded seam. Pipe length 700 mm (~13 diameters of charge), wall thickness 5 mm, it placed the explosive charge length 600 mm on Top of the shell at a distance of 324 mm from the plane of initiation, which is 0.54 length of charge (~6 diameters of charge), firmly placed the measuring ring.

If a burst pipe is opened weld seam. Detonation of the charge is not full, the speed of detonation is impossible to measure. Measuring the ring remained unchanged.

The relative efficiency cannot be calculated.

Example 12 (Prototype).

As the shell use lead bomb (a cube of size 200×200×200 mm)with a cavity in the form of a blind axial channel length 125 mm, in which the paper sleeve with a diameter of 24 mm with the explosive charge. The length of the charge 20 mm (~1 charge diameter, wall thickness bomb 85,5 mm is the long CENTURIES initiate the detonator ED-E. After the explosion, measure the channel extension bomb.

The extension was 30 cm3that corresponds to the extension when the explosion only the detonator.

The relative efficiency of mixed coarse CENTURIES cannot be calculated.

As follows from the above Examples 1 and 2 (table), the proposed method allows to determine the relative efficiency of modern industrial coarse CENTURIES that it is impossible to determine, using the method specified in the prototype.

Pipe length, ~d chargeWall thickness, mmThe location of the ring, the length of chargeSteel ringRing diameter, mmRing height, mmSpeed of detonation, m/sThe integrity of the ringVBB
11350,5445150503600 2600,77
21950,6045150503600full2600,77
31750,573150503600gap--
41750,5745130503600gap--
51750,5745150703600gap --
61350,5045150503800full2400,71
71950,7045150503600full2450,72
81320,544515050attenuationfullunchanged-
9950,5745150504200full 3000,88
101750,5745150203600gap--
11135, the weld0,574515050attenuationgap--
12185,5----impossible to measure---

The method of determining the relative health of explosives, including room charge explosives (he) in the cavity of the shell, the blasting explosive charge in it, the determination of the volume of the enlarged cavity and the calculation of the relative health C is the number of CENTURIES, characterized in that the shell uses seamless steel pipe with a minimum diameter of 50 mm with wall thickness not less than 5 mm and a length of at least 10 diameters of charge, over which at a distance of 0.54-0.60 length of the charge from the beginning of the initiation tightly place the measuring ring, made of steel 45 with a diameter of not less than 150 mm, a height of 30-50 mm, perform the test explosion of the explosive charge and the charge of the Ammonite IV as a reference, determine the changed volume of the internal cavity of the measuring rings of the test and reference explosive charge and the calculation of the relative health of EXPLOSIVES carry out volumes expanded after the explosion internal cavities of the measuring rings of the test and reference explosive charge, and additionally measure the velocity of detonation of the explosive charge to monitor the completeness of the detonation process.



 

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