SU836351A1 - Device for damping air shock waves - Google Patents

Description

(54) DEVICE FOR SENSATION OF SHOCK. AIRWAVES

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The invention relates to the mining industry and can be applied to mitigate the destructive effect of air shock waves arising from underground explosions.

A number of devices are known that are designed to attenuate shock air waves arising from underground explosions and based on the creation of water curtains on the way of such waves, which are several successively laid on the soil the production of plastic bags with missed detonating cords under them ( LH) and an electric detonator, the wires from which are connected to a common explosive network. With the explosion, the spike bags are broken and the water is sprayed in the excavation 1.

The drawback of the devices is the short duration of the existence of the air-air curtain and the uneven saturation of air with particles of water, as a result of which the efficiency of the device is low.

According to the technical nature and goal, the closest to the invention

is a device, which is a mobile base with braking devices, on which water is installed on the air tank and the air tank, connected to the pipeline with built-in

trigger mechanism, and the water capacity is communicated nutrient pipe with irrigation and spray nozzles, and the device itself is closed by a protective cover 2.

The disadvantage of this device is

rigid fixation on rails by braking devices, in which the device has to withstand large stresses during the passage, although weakened, but still having some energy reserve of the shock air wave.

The aim of the invention is to improve the reliability of the device. work.

The goal is achieved by the fact that the braking devices are made in the form of remote clamps connected to the moving base by shock-absorbing elements equipped with pre-tensioning mechanisms.

Claims (2)

h The drawing shows the device, side view. 383 The device consists of a mobile base I, on which air 2 and water for 3 storage tanks are installed, interconnected by pipeline 4 with a trigger mechanism 5 mounted into it. Water to capacity 3 by means of a feeding pipe b is communicated with irrigation-spray nozzles 7 The tanks 2 and 3 are equipped with filling pipes 8 and non-return valves 9. The device is enclosed in a protective casing 10 and is equipped with external clamps 11 fixed to the rails. Mobile base 1 is connected to external clamps AND, with shock-absorbing elements 12, by means of pre-tensioning mechanisms 13, for example screw. The device works as follows. Before the explosions were carried out, the device (one or several, depending on the layout of the charges to be broken and the network of workings to be protected) was charged in the mine, for which with the help of filling pipelines 8 and. check valves 9 water tank 3 is filled with water, and the air tank 2 with compressed air. The trigger 5 is equipped with an explosive charge with a fuse. The device is fitted to the right place, the external clamps 11 are fastened to the rail. Then the shock-absorbing elements 12 are stretched using the pre-tensioning mechanisms 13 and, thus, the device is fixed in the right place of production. The wires from the fuse of the trigger mechanism 5 are connected to the launch console (to the mine station) or simply to the mine blasting network and ensure the device starts approximately 0.5 minute before the start of explosions in the mine. When a pulse is applied to the explosive network, the charge in the trigger mechanism 5 is first undermined, a through passage through the pipeline 4 is created and compressed air from the tank 2 begins to flow into the container 3 and displaces water from it, which enters the spray nozzle through the feeding pipe 6 7 and sprayed in them. With a sufficient diameter of the feed tube b and the pressure of compressed air in the tank 2 is not lower than 5 atm through nozzles 7, which are arranged in several horizontal-orbital rows and the number of which can be quite large, 1 second can be chopped and ripped up l of water, and the device itself, with an appropriate volume of containers, can operate continuously for several seconds, that is, as much time as explosions in the drill (for short-delayed detonation of a series of charges). Such a second flow of water ejected and sprayed at an appropriate pressure creates an effective air curtain, and the presence of a flexible connection between the device and its attachment points to the rails creates conditions under which the device is not damaged by the passing shock waves; that is, its reliability increases and, as calculations show, maintenance costs are reduced by approximately 15-20%. The economic effect in comparison with previously known structures is achieved due to reliability, i.e., preservation of the structure after a massive explosion and the possibility of its repeated use, as well as due to the preservation of communications of mine workings from the shock air wave and reduction of assembly and dismantling and other work before and after the explosion . The invention The device for damping shock air waves, including a mobile base with braking devices and air and water storage tanks installed on it, interconnected by a pipeline with a trigger mechanism built into it, a protective cover and spray-irrigation nozzles, characterized by that, in order to increase the reliability of the device in operation, the braking devices are made in the form of remote clamps connected to the movable base by shock-absorbing elements equipped with s pre-tensioning. Sources of information taken into account in the examination I. Buzukov A. A. and others. Underground mining of ore deposits. Novosibirsk, 1970, p. 176-180. 2. USSR Author's Certificate No. 265503, cl. B 21 C 37/00, 1978, (prototype).