Field emulsion explosive mixing and charging system and charging method suitable for underground engineering

Abstract

The invention discloses a field emulsion explosive mixing and charging system and charging method suitable for underground engineering. The drug outlet of a mixing machine is connected with the drug inlet end of a drug conveying pump; the drug outlet end of the drug conveying pump is communicated with a drug conveying hose through a water ring adding device; a mixing shaft is arranged in the drug mixing cavity of a mixing machine shell; a premixing chamber is formed above the feeding hole of the mixing machine shell; a drug spray device is arranged at the drug outlet end of the drug conveying hose; a spray head of the drug spray device has a cylindrical structure; and the spray head is provided with a main drug spray hole along the axial lead of the spray head. The aim of ensuring the explosion effect is fulfilled mainly through technical innovations on three aspects: I, the pre-mixing chamber is formed on the top of the mixing machine shell; II, the sensitizing way of the emulsion explosive is physical sensitization; and III, the drug spray device is additionally arranged at the upper end of the drug conveying hose. Meanwhile, specific to the aim of lowering the working pressure of the drug conveying pump, a shearing device arranged on the drug conveying hose and used for increasing the viscosity of the emulsion explosive in the prior art is eliminated.

Description

technical field [0001] The invention belongs to the field of mixed charging of explosives for underground engineering, and in particular relates to an on-site mixed charging system and charging method for emulsion explosives suitable for underground engineering. Background technique [0002] Underground engineering (such as underground mines) mostly adopts the mining method of segmental caving without pillars, and the blastholes are arranged in an upward fan shape. Traditionally, ammonium oil explosives chargeers or carts are mainly used for charging. The charging principle is to take advantage of the good fluidity of powdered (or granular) ammonium oil explosives. Blow into the blast hole. This traditional charging method has problems such as high charge return rate, high air pollution, low filling density, and poor blasting effect. At the same time, because ammonium nitrate, the main component of ammonium oil explosive, has strong water absorption, ammonium oil explosive...

AI Technical Summary

Problems solved by technology

One way of loading emulsion explosives is to transport the emulsion explosive rolls processed by the factory to the blasting site, and then manually load them into the blast holes. This method mainly has two defects: 1. The safety of the emulsion explosives during transportation is low , prone to safety accidents such as explosions; 2. For upward blastholes, the depth of the blastholes is large (the maximum depth can reach more than 30m), not only labor-intensive, but also more difficult to charge. The phenomenon of "stuck hole" or insufficient charge occurs, and the blasting effect is difficult to guarantee

[0015] The shortcoming of the closest prior art is as follows: one, can't guarantee blasting effect well, its main reason is as follows: (1), the detonation performance of emulsion explosive is not ideal, and the factor that causes this defective mainly contains: a, existing The sensitization mode that has emulsion explosive adopts chemical sensitization, because the self-defect of chemical sensitization mode makes the emulsion explosive that adopts this sensitization mode not to be suitable for the up-up blast hole of underground engineering; b, existing mixer is difficult Fully and evenly mix the high-viscosity latex matrix with low-density dry bulk materials; (2), the charging effect is not satisfactory, and the emulsion explosives tend to fall back out of the upward blast hole, and the charging effect is not only the same as the viscosity of the emulsion explosives, It is related to the sensitization method, and it is also related to factors such as the speed at which the explosive is sprayed out of the drug delivery hose

[0016] 2. In order to ensure the explosive performance of the explosive, it is often necessary to add a shearing device on the drug delivery hose to increase the viscosity of the emulsion explosive, but this will greatly increase the working pressure of the drug delivery pump, which is not convenient for the safe operation of the drug delivery pump

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