PNEUMATIC DEVICE FOR MECHANIZED SCALING “SCALING PNEUMATIC CROSSBAR” Russian patent published in 2021 - IPC E21D13/04 E21C27/02 

FIELD: underground workings.

SUBSTANCE: invention relates to a device used in the development of underground workings with a height of more than 3.5 m and designed to remove the resulting chips in order to bring the bottom to a safe state. The pneumatic device for mechanized scaling consists of a working body made in the form of a lance or a blade, a pipe connected to the supply line through a control valve designed to regulate the supply of compressed air into the inner cavity of the pipe from the supply line. The pipe is made of duralumin and is connected on one side with a control valve body made of polyurethane, the inner cavity of which is made with the possibility of overlapping it with a conical control valve. The inner cavity of the control valve body on one side is connected with the inner cavity of the pipe, and on the other side is intended for connection to the supply line of compressed air. On one side, the pipe is screwed into a sleeve, into which a hollow body of the striker is screwed on the other side, divided into two sections. The first section of the striker body is located inside the sleeve, and the other section is located outside the sleeve. The inner section of the striker body is made with a variable transverse diameter, the part of the inner section of the striker body adjacent to the outer section, on the outer surface of which a thread is made for screwing into the sleeve, is made with a diameter corresponding to the inner diameter of the cross section of the sleeve, the other part of the inner section of the striker body, facing the pipe, made with a smaller diameter with the formation of an annular chamber between the outer surface of the inner section of the striker body and the inner surface of the sleeve. The end face of the inner section of the striker body, facing the pipe, is tightly closed with a plug partially located outside the striker body. In this case, a groove or slot is made between the outer side surface of the plug and the inner surface of the coupling, communicating on one side with the annular chamber, and on the other side with the inner cavity of the pipe. Through holes are made on the lateral surface of the inner section of the striker body to ensure communication of the inner cavity of the striker body with the annular chamber. Inside the body of the striker, the striker is freely placed, made in the form of a cylindrical piston. Along the longitudinal axis of the striker, an elongated recess is made in the form of a hole extending outward of the striker from the side facing the plug. Inside the striker, there are radial channels extending onto its outer side surface and communicated with the central longitudinal hole. The part of the striker facing the plug is made with a cross-sectional diameter equal to the inner diameter of the striker body, the other part of the striker facing the working body is made with a smaller diameter with the formation of an annular gap between this outer surface of the striker and the inner surface of the striker body, between the parts a step is formed for a striker with a larger and smaller diameter. On the inner surface of the striker body there is an annular protrusion with an inner diameter corresponding to the smaller diameter of the striker part facing the working body, the said annular protrusion is designed to engage with the striker step when the striker moves inside the case. The annular protrusion of the striker body is located from its end closed with a plug at a distance determined with respect to the stroke of the working element, which ensures, when the annular protrusion of the striker body is engaged with the striker step, the position of the radial holes of the striker on the other side of the annular protrusion of the striker body with simultaneous isolation of the inner cavity of the striker from the annular chamber The body of the working body is screwed onto the outer section of the striker body. In this case, the working body is made consisting of an outer section and an inner mounting section. The outer section of the working body is made in the form of a peak or a blade. Opposite through holes are made in the lateral surface of the body of the working body. There are two opposite grooves oriented along the axis of the device on the inner mounting section of the working body. Each groove is a recess. The length of each groove is chosen on the basis of its correspondence to the working stroke of the striker, each groove is located under the corresponding through hole in the side surface of the body of the working body, in each the through hole of the body of the working body contains a ball made with a diameter smaller than the diameter of the through hole in the body of the working body, while the ball is partially placed in a groove located under the corresponding through hole in the body of the working body, outside the balls are pressed against the working body by the inner surface of the nut, installed outside on the body of the working body and designed to fix the position of the ball in the groove of the working body and prevent it from falling out of the through hole.

EFFECT: simplification of the design, increased ease of use, lightening the design of the device, improved reliability and strength.

11 cl, 4 dwg, 1 tbl