DE1036789B - Gas pressure explosive device for coal u. Like. With gas outlet openings controlled by a sealing piston - Google Patents

Description

GERMAN

It is already known when coal is extracted that dust is generated when it is pushed into it of water under pressure to decrease in the coal face. In this impulse soaking process, the Soak coal with water at a relatively high water pressure as much as possible, forming cracks and to be won over more easily.

It is also the so-called soaking-shooting process known, in which water is introduced under pressure into the loaded borehole and then the explosive charge is ignited ("The Colliery Guardian" magazine, 1954, pp. 383 to 390). With the Explosive detonation sprayed water and pressed into the coal increases the risk of explosion Firedamped weather and reduced by dust swirl. At the same time, a more extensive one takes place Loosening the coal than solely by the explosives. There is also a gas pressure explosive device for coal and the like with gas outlet openings controlled by a sealing piston and a Known shut-off whose chamber containing the compressed gas has two annular on its outer surface Clamps is provided, between which an elastic sealing sleeve made of rubber-like material (see U.S. Patent 2,083,976). The fastening of an elastic sleeve, which exerts a push-off effect on the coal, by means of a clamp-type sleeve annular parts belong to the state of the art (see US Pat. No. 2,634,113).

A gas pressure explosive device has the advantage that it eliminates the possibility of firedamp ignition entry.

The invention is based on the object of an expedient, easy-to-use gas pressure explosive device to create this type, in which gas and water pressure are used at the same time, whereby dust generation is essentially eliminated.

The object is achieved in that, according to the invention, the chamber has a shell space over part of its length, which is provided with a water inlet near the end of the shell space and near the gas inlet leading into the chamber and with a water outlet near the other end the jacket space is provided for impregnating the coal face, and that the space formed between the inner surface of the sealing sleeve and the outer surface of the chamber is connected by a line to the gas space for inflating the sealing sleeve and the sealing sleeve and the clamps holding it about in the Located in the middle between the water inlet and outlet of the jacket space.

In the drawing are an embodiment of the gas pressure explosive device for coal

and the like with gas outlet openings controlled by a sealing piston

Applicant:

Imperial Chemical Industries Limited,
London

Representative: Dipl.-Ing. A. Bohr, Munich 5,
Dr.-Ing. H. Fincke, Berlin-Lichterfelde, Drakestr. 51,
and Dipl.-Ing. H. Bohr, Munich 5, patent attorneys

Claimed priority:
Great Britain September 24, 1954 and July 8, 1955

Robert Haslam, Glasgow,

and Samuel Henry Davidson, Largs (Great Britain), have been named as inventors

Subject of the invention and an example of the use of the latter shown. It shows

Fig. 1 is a longitudinal section through a coal pile and

2 shows a longitudinal section through the device according to the invention.

The gas pressure explosive device according to the invention has gas outlet openings 24, which through a Closure piston 25 are controlled, which closes the openings when gas enters a chamber 11; the locking piston 25 is held in the locking position by a shear pin 27; the The shear pin can withstand a predetermined pressure. When the gas pressure in the chamber 11 has reinforced as a result of the supply of gas from the outside that the bolt-like pin gives way and thus the closure piston 25 is moved into a position in which the outlet openings 24 are released the gas enclosed in the chamber 11 is suddenly released.

The wall of the chamber 11 has on part of its length a jacket space 17 to which a Leads water inlet 18, which is arranged in the vicinity of the end of the shell space; in the vicinity of the Water inlet 18 is the mouth of a line 12 for the gas inlet 7 in the chamber 11. At the other

809 59 * / 4

Claims (1)

Ren end of the jacket space 17, a Wasseräuslaß 19 is provided for filling the borehole with water. On the outer wall of the gas pressure explosive device is at the level of the jacket space 17 - held by two clamps 16 ■ - a gas-tight sealing sleeve 15 made of rubber, plastic or the like. arranged. This sealing sleeve closes off a space 14. When pressurized gas enters this Space 14 bulges the sealing sleeve 15 and occurs with the walls of the borehole into which the Device is inserted, in contact: this creates a tight seal, so that upon release de> pressurized gas from chamber 11 is the water pressure can form in the borehole. The sealing sleeve 15 and the clamps 16 are in the middle between two the water inlet 18 and the water outlet 19 of the jacket space 17. When using the gas pressure explosive device according to the invention, gas is in the space 14 below initiated a pressure that is greater than the maximum Water pressure in the borehole, but less than the actuation pressure of the piston 25, whereupon then the introduction of water into the borehole is continued until it is visible on the coal. The explosive device is then ready to operate, and for this purpose the gas pressure is increased, until the shear pin 27 gives way. The gas is fed into the membrane-like closed space 14 through a line 13, the across the jacket room 17 leads. In the line 12 of the gas inlet 7 is a reducing valve 8 (Fig. 1) intended. The width of the sealing sleeve 15 is preferably slightly larger than the distance between the Clamps 16, so that this is usually slightly curved. The ends of the sealing sleeve 15, which of the Clamps 16 are held, are preferably reinforced and provided with a metal cover to to keep it level during the deformation of the sealing sleeve. The device according to the invention is introduced into a borehole 3 in a known manner. The coal is usually undercut here by a bevel 4. The gas outlet openings 24 of the device diverge in a known manner and are directed towards the closed end of the borehole. After opening the water supply, the water passes through the jacket space 17 into the borehole 3, initially displaces the air in the latter to the outside and then soaks the coal face. Then the gas supply, possibly also compressed air, is introduced under a pressure regulated by the reducing means 8, in such a way that the pressure prevailing in the device is below that which is required to actuate the sealing piston 25, but above the maximum Water pressure that prevails in the borehole. This gas pressure is, for example, 114 kg / cm ² . The pressurized gas entering the space between the outer surface of the device and the sealing sleeve bulges the latter so that it comes into close contact with the borehole wall. Through the behind This seal prevailing water pressure penetrates the constantly supplied water into the crevices of the Coal, soaking them, a; sooner or later, as soon as the coal is saturated, the water seeps then out through the surface of the coal. Now the reducing valve 8 is actuated and the required gas pressure set, whereby the shear pin 27 gives way and the sealing piston is opened. The pressurized gas quickly enters the water-filled borehole: this discharge pressure is transferred to the water, causing the desired explosive effect is brought about by gas and water. As can be seen from FIG. 1, the borehole 3 is set in the coal face between the lying wall 1 and the hanging wall 2 and the coal has been undercut at 4. The device according to the invention is connected to a water line 6 and to a compressed gas line 7a . In addition to the reducing valve 8, stop valves 9 and 10 are also provided. The above-described line 12 for the gas inlet 7 is mounted in a cap 20, soft on a closure 21 is screwed and is held by a part 22, which is also in the Closure 21 is screwed in "; The outlet openings 24 are arranged in a cylinder 23, which is the Already described above carries the closure piston 25, which is attached to a rod 26. the is held in place by a metal shear pin that acts as a latch. The shear pin 27 is inserted through a hole 28. At the front end of the device according to the invention is a head 29 arranged, which is screwed into the cylinder 23 and can be removed, if necessary To be able to remove remaining parts of the pin 27 which remained in the device after the detonation are. P λ τ F>; τ λ χ s imu: c: π: Gas pressure explosive device for coal and the like with gas outlet openings controlled by a sealing piston and a shut-off device, the chamber containing the compressed gas on its outer surface is provided with two ring-shaped clamps, between which an elastic sealing sleeve is attached from rubber-like material, characterized in that the chamber (11) on has a part of its length a jacket space (17) with a water inlet (18) in the Near the end of the shell space and near the gas inlet leading into the chamber (7) and with a water outlet (19) near the other end of the shell space (17) is provided for impregnating the coal pile, and that that formed between the inner surface of the sealing sleeve (15) and the outer surface of the chamber Space (14) through a line (13) with the gas space for inflating the sealing sleeve is in connection and the sealing sleeve (15) and the clamps (16) holding them approximately in located in the middle between the water inlet (18) and outlet (19) of the jacket space (17). Considered publications:
French Patent No. 786 577;
U.S. Patent Nos. 2,083,976, 2,634,113;
"The Colliery Guardian" magazine from April 1, 1954, pp. 383 to 390. 1 sheet of drawings © 809 598/4 B.