A green blasting device for enhancing the crushing effect at the bottom of the blast hole

Abstract

The invention discloses a green blasting device for enhancing the crushing effect at the bottom of a blasthole, which comprises a reflector, a movable plate and a blocking plate. It is tightly connected with the blocking plate through at least one connecting rod. The movable plate is sleeved on the connecting rod between the reflecting plate and the blocking plate and can move freely along the axial direction of the connecting rod. The movable plate and the reflecting plate There is a water bag between the movable plate and the blocking plate, there are a plurality of push rods moving in the radial direction in the blocking plate, and there is a push block on the top surface of the movable plate to When the high-pressure gas generated during the blasting of the explosive pushes the lower part of the movable plate up along the axial direction of the connecting rod to squeeze the water bag, the push block pushes the front end of the ejector rod outward along the radial direction of the blocking plate against the inner wall of the blast hole. The device can effectively improve the internal wave impedance of the blast hole, reduce the super-depth of the blast hole, expand the opening angle of the blasting funnel, and improve the blockage and airtightness of the blast hole and the frictional resistance.

Description

technical field [0001] The invention relates to the field of blasting in open-pit mines, in particular to a green blasting device for improving the crushing effect at the bottom of a blast hole, which improves the energy utilization rate of explosives, reduces harmful gas emissions, and improves engineering blasting effects. Background technique [0002] Step blasting is the basic means of open-pit mine production. According to the hole diameter and hole depth, it can be divided into deep hole step blasting and shallow hole step blasting. At present, some large-scale mines at home and abroad use large-aperture drilling rigs to realize large-area, multi-row differential deep hole blasting, and have conducted in-depth research on hole network parameters, charge structures, packing methods, detonation sequences, and differential interval time. , greatly improving mine production efficiency. In addition, with the renewal of drilling equipment and equipment, the continuous impro...

AI Technical Summary

Problems solved by technology

[0009] 1. The outer curved surface of the steel ball has a large curvature, which causes the energy reflection of the stress wave to be too scattered, which affects the crushing effect

[0010] 2. Steel balls mixed with ore and entering the crushing system of the concentrator may cause great safety hazards and serious economic losses

In the comparison document, steel balls with high wave impedance are used, which have a small amount of deformation during blasting and basically maintain a spherical shape. It is difficult for the steel balls to be absorbed by the electromagnetic chuck when passing through the conveyor belt (the entire spherical surface of the steel ball has a small adsorption surface, no matter how the conveyor belt vibrates, When the steel ball rotates, the adsorption of the spherical surface is limited, which is not enough to hold the steel ball), resulting in damage to the crushing equipment and system shutdown

[0011] 3. Waste of material, the outer diameter of the steel ball is slightly smaller than the inner diameter of the blast hole, and a large amount of steel is required, resulting in an increase in production costs. In actual use, the same crushing effect can be achieved by using a steel plate with a thickness of 3-5cm

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