Thrust stemming

FIELD: drilling and blasting operations in hard rocks at open pit mining, applicable in various branches using spare blasting operations and blasts under a shelter in hard rock masses.

SUBSTANCE: the thrust stemming is made in the form of a metal cylinder having a tapered expansion with several rows of shoulders from the outside in the lower part and at least three longitudinal slots inserted in which is a metal thrust cone with an inner cavity, provided with a tubular tie-rod with a thread on the upper end, freely passing through the axial channel of the bearing ring positioned above the cylinder.

EFFECT: enhanced efficiency of blasting crushing of rocks due to locking of the detonation products in the charge cavity of the thrust stemming up to the moment of complete destruction of the environment.

2 dwg

 

The invention relates to the field of drilling and blasting operations in strong rocks on open cast mining and can be used in a variety of industries, applying gentle blasting and explosions were entombed in rocks of rocks.

There are various designs of locking seboek in the form of plastic tubes, wooden and concrete wedges [1]. Their main disadvantage is low efficiency.

The technical problem to which the alleged invention is directed, is to increase the efficiency of ore crushing rocks due to the locking of detonation products in the charging cavity spacer stemming until the complete destruction of the surrounding rocks.

This object is achieved in that according to the invention the spacer stemming made in the form of a metal cylinder having a conical extension with multiple rows of tabs on the outside at the bottom and at least three longitudinal slots, in which is inserted a metal spacer cone with an internal cavity, provided with a tubular thrust threaded on the upper end, freely passing through the axial channel of the support ring located on top of the cylinder.

1 schematically depicts an expansion stemming in position in the borehole, figure 2 - after the onset of detonation of the explosive charge.

The spacer is the stemming is made of metal and includes a cylinder 1 with an axial cavity 2, in the lower part of the challenge in a conical extension 3 with slots 4, is provided in the lower part of the outside several rows of protrusions 5. In the conical extension 3 is inserted hollow spacer cone 6, which is connected with a tubular thrust 7, freely passing through the axial channel 8 a supporting ring 9, includes mounting loops 10. The upper part of the tubular thrust 7 is threaded, on which is wound a nut 11. For centering the tubular thrust over 7 conical extension 3 posted by jumper 12.

Expansion stemming works as follows. On the surface of the spacer block stemming gather in a constructive element. To do this, insert the spacer cone 6 with a tubular thrust 7 in conical extension 3 of the cylinder 1, skip tubular rod 7 through the axial cavity 2 to its exit from the cylinder 1. Then on the rod 7 through the axial channel 8 is put on the support ring 9 and wind the nut 11, tightening tubular thrust spacer 7 cone 5 to the entrance of the conical extension 3. Then through the tubular rod 7 is passed Explorer initiating impulse 13 (wires from the detonator, the waveguide nonelectric system or detonating cord) and mounting tabs 10 spacer stemming lower bottom part of the hole or bore 14. The diameter of the bottom of the conical extension on the projections 4 to 6 mm less than the diameter of the bore-hole or well that call the spacer allows the stemming freely enter the hole or bore 14 to the location of the support ring 9 on the surface of the ledge. After that nut 11 draw spacer cone 6 in a conical extension 3, it is at the expense of the slots 4 bursting with the lower part of the conical extension 3, is supplied from the outside ledges 5, in the wall of the hole or bore 14. Expansion stemming ready for use.

After detonation of the explosive charge in the charging cavity dramatically increases the pressure of detonation products to values of a few tens of thousands of atmospheres and dynamic kick gases over a large surface of the inner cavity spacer cone 6, which leads to pushing it into the conical extension 3. Thus the bottom part of the conical extension 3, is supplied from the outside ledges 5, destroys them part of the walls of the well and forms a recess 15, which leads to dense jamming spacer tamping in the borehole or well. The tubular rod 7 thus passes freely through the axial channel 8 without disturbing the position of the support ring 9. In this position the spacer stemming remains until the breakthrough products of detonation of the charge cavity to the atmosphere through cracks in the broken array. Providing long-term isolation of the charging of the cavity, the spacer stemming contributes to a more complete course of secondary reactions in the detonation products and accordingly raises the energy of the explosion; this is especially important for modern coarse CENTURIES types of granulite and ramonito, which is a significant proportion of the energy released in the process of secondary reactions.

Thus, the claimed expansion stemming allows you to lock the products of an explosion into the charging cavity to the destruction of the array and thereby to solve the technical problem.

The source of information

1. Mindeli AO, Demchuk P.A., Alexandrov VE the Stemming of blast holes. - M Depths, 1967. - 152 C.

Expansion stemming, made in the form of a metal cylinder having a conical extension with multiple rows of tabs on the outside at the bottom and at least three longitudinal slots, in which is inserted a metal spacer cone with an internal cavity, provided with a tubular thrust threaded on the upper end, freely passing through the axial channel of the support ring located on top of the cylinder.



 

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