SU781349A1 - Machine for charging blast holes with hot-flowing explosives - Google Patents

Description

I

The invention relates to a technique used in drilling and blasting operations and can be used in the development of mineral resources by the open method and for the device of specialized excavations in soils.

A well-known machine for charging wells with hot explosives, equipped with a self-propelled base / bunker for a loose explosive, a screw feeder, a dosing pump, a two-roller blade mixer, a pump for circulating hot water and charging pipe 1.. Also known is a machine for charging wells with burning explosives, including an installation for preparing an aqueous solution of nitrate installed on a self-propelled base, a mixing-injection device and a charging pipeline 2.

A disadvantage of the known machines is that they do not provide a uniform change in the charge density over the height of the well during charging.

It is known that in drilling and blasting operations it is often necessary

changes in charge density over the height of the well, for example, for the qualitative development of a step along the sole. The presence of air bubbles in the finished explosive reduces its density.

5 The purpose of the invention is to obtain a technologically necessary change in charge density over the height of the well during charging.

This goal is achieved due to the fact that the well charging machine with water-filled burning explosives is supplied with a compressed air cylinder and installed between the mixing-tensioning device and the charging pipeline

A 15 nozzle with a nipple-metering device connected by means of a pneumatic actuator with a compressed air cylinder, wherein the nipple-metering unit is designed as a housing with a movable slide valve mounted in it and a return spring 20.

FIG. 1 shows a well charging machine, side view; in fig. 2 - transitional pipe with a nipple dispenser, a cut .. The machine contains a self-propelled base 1 with a frame 2 rigidly fixed on it, on which the hopper 3 of loose explosive is mounted, connected through the dispenser 4 with a mixing-injection device 5, tank b for water heating; a tank 7 for preparing an aqueous solution of nitrate; a pump 8 for transporting hot water; and a cylinder 9 with compressed air.

The tank 7 for preparing an aqueous solution of nitrate is connected by pipeline 10 through a pump 8 to a tank 6 for heating water and is equipped with an impeller 11 and a submersible pump 12 for transporting an aqueous solution of nitrate. The mixing-injection device 5 is connected by pipeline 13 to the submersible pump 12 of the tank 7 for the preparation of an aqueous solution of nitrate and supplied. submersible pump 14, pipe line 15, valve of moment limit 16 and valve 17. Between charging pipe 18 and valve 17 of the mixing and injection device 5, a transition pipe 19 with a nipple dispenser 20 is installed. Nipple dispenser 20 is rigidly fixed in the transition A pipe 19 housing consisting of a cap 21 and a cover 22 in which a movable slide valve 23 and a return spring 24 are mounted. The housing of the nipple metering unit 20 is connected by the air line 25 through the flow meter 26 and the gearbox 27 to the cylinder 9. With compressed air.

The machine works as follows.

TNT is poured into the bunker 3 of the loose explosive, and the tank 6 is filled with water to heat the water. The water heated in the tank, 6 by means of the pump 8, is fed through the pipeline 10 to the tank 7 to prepare an aqueous solution of nitrate, to which the nitrate is simultaneously supplied in a predetermined proportion. Impeller 11 intensively mixes the mixture.

The aqueous solution of nitrate prepared in the tank 7 is submerged by the pump 12 through the pipeline 13 to the mixing and injection device 5, where the necessary amount of TNT is simultaneously supplied from the hopper 3 through the dispenser 4. With the help of a submersible pump 14, the mixture is statically mixed and, upon reaching a predetermined concentration, the charge line 18 is supplied to the well. To change the density of the explosive charged to the well, the air from the cylinder 9 through the pneumatic line 25 is fed into the housing of the nipple metering unit 20. In this case, the movable valve 23 moves, opening the hole in the cap 21, and air enters the charging line 18. Passage through the charging conduit 18, the air is evenly distributed throughout the volume of the explosive suspension, and the density of the latter varies. Spring, 24 return is used to return the movable valve 23 to its original position when the air supply is stopped.

The amount of air supplied to the charge pipe 18 is adjusted for

Q is the count of the pressure change in the air duct-nipple system with the aid of a reducer 27. The pressure and air flow are monitored by means of a pressure gauge and a flow meter 26.

Thus, by applying

A nipple metering device installed by a charging line and a mixing pressure device connected by a pneumatic line through a flow meter and a reducer with a balloon with compressed air makes it possible to vary the density of the charge along the height of the well during the charging process, which reduces explosive consumption. during charging and to improve the quality of development of the ledge along the sole.

Claims (2)

1. A machine for charging wells with burning explosives, an installation for preparing an aqueous solution of nitrate mounted on a self-propelled base, a mixing-injection device and a charging pipeline, characterized in that, in order to obtain a technologically necessary change charge density in the process of charging, it is equipped with a compressed air cylinder and a transition pipe with a nipple dispenser installed between the mixing-injection device and the charging pipe connected by means of a pneumatic actuator with a compressed air cylinder. 2. The machine according to claim. 1, characterized in that the nipple-dispenser is made in the form of a housing, with a movable slide valve mounted in it and a return spring. Information sources, taken into account when examining 1. USSR author's certificate No. 243460, class E 21 C 37/00, 05.23.66. 2.The second author's certificate of the USSR No. 544264, cl. E 21 C 37/00, 05.26.75. about i ABOUT 781349 IS Zf- 221