SU1229703A1 - Apparatus for excitation of seismic waves - Google Patents

Abstract

This invention relates to devices for exciting seismic waves. The aim of the invention is to increase reliability. The device comprises a sleeve 1 forming with the piston 3 a working chamber 4 and a damping cavity 6 filled with compressed gas. The tank 8 is filled with liquid and is connected to the cavity 10 of the rod 2 channels of more 11 and less 12 sections. The channel 11 is blocked by the spool 13. In the cavity 18, a fluid is supplied under pressure, which displaces the piston 3 downwards, additionally compressing the gas in chamber 4. The valve 15 is lifted, and the liquid from the reservoir 8, after passing through channels 12, displaces the spool 13 down 11 with a larger cross section, and the liquid from the reservoir 8 freely passes into the cavity 10, unlocking the piston 7 holding the piston 3. Using the stopper of the piston 7 with a liquid instead of a mechanical stopper improves the reliability of the device. 3 il. (П С с с с ъо со N1 О со

Description

The invention relates to seismic exploration, in particular to devices for exciting seismic waves.

The aim of the invention is to increase the reliability of the device.

FIG. 1 shows the proposed device, a general view; in fig. 2 - the same, before working exposure; in fig. 3 - the same at the moment of impact on the ground.

The device for exciting seismic waves contains a sleeve 1 with a rod 2, a piston 3, which forms with the sleeve 1 a working chamber 4 and a damper cavity 6 bounded by a disk 5, in which an additional piston 7 is placed, the upper cylindrical part of which forms with a rod 2 an annular tank 8 limited . from the damper cavity by a washer 9 rigidly fixed on the rod 2, and connecting sieHHbDH with the internal cavity 10 of the rod 2 with channels of more than 11 and less than 12 sections. In the cavity 10, a spool 13 is inserted, which is pressed by a spring 14, which covers the channels 11 of a larger cross section. The rod 2 is provided with a controllable valve 15 blocking the channels 12 of a smaller section. To fill the working chamber 4 with the working fluid, there is a valve 16. The damper cavity 6 is filled with an inert gas through the valve 17. The cavity 18 between the piston 3 and the additional piston 7 serves to pump fluid from the hydraulic system of the base machine through the valve 19.

The device works as follows.

In the working chamber 4 through the valve 16 is pumped into the working fluid, after which it is sealed. The piston 3 occupies the top position. An inert gas is pumped into the damper cavity 6 through the valve 17 and sealed. In the annular tank 8 pour liquid. The spool 13 and the controlled valve 15 close the channels of greater 11 and smaller 12 sections (Fig. 1). From the hydraulic system of the base machine, fluid is supplied through the valve 19 to the cavity 18 under pressure. By the incompressibility of the fluid in the annular reservoir 8, the additional piston 7 remains stationary, the piston 3 is pressed down and compresses the working fluid in the working chamber 4 to the required pressure (MPa). After that, the valve 19 is closed, and the device is ready for production impact on the soil (Fig. 2).

Upon a command from the control panel, the control valve 15 opens the channels 12 of a smaller section. The liquid from the annular reservoir 8 penetrates into the internal cavity 10 of the stem 2, depresses the spring-loaded spool 13, the channels of the larger section 11 are opened, and the liquid from the annular reservoir 8 flows into the internal cavity 10 of the stem 2. The additional piston; 7 is unlocked. Under the influence of energy enclosed in compressed

the working body in the working chamber 4, the piston 3 rushes upwards. The liquid from the annular reservoir 8 flows into the internal cavity 10 of the rod 2, pressing the spool 13 to its lowest position. The sleeve 1 is pressed into the ground, exciting seismic waves in it (Fig. 3).

After the force acting on the piston 3 from the side of the working chamber 4 is compared with the force acting on the side of the inert gas in the damper cavity 6, it stops. Open the valve 19. Under the action of the spring 14, pushing the liquid

From the internal cavity 10 of the rod 2 to the annular reservoir 8, and the pressure of the inert gas in the damping cavity 6, the additional piston 7 moves downwards. 18 cavity fluid

flows into the hydraulic system oil tank base machine. The spool 13 overlaps the channels 11 of the larger section. Remove the & signal from the control valve 15, and it closes the channels 12 of a smaller section. The device is brought to its original position (Fig. 1) and is ready for the next working cycle.

The invention makes it possible to stop the additional piston with a liquid, which ensures the increased reliability of the device.

Form, l and inventions

A device for exciting seismic waves containing a sleeve with a hollow rod and a piston, forming a working chamber and a damper cavity, a hydraulic system, an additional piston located in the damper cavity coaxially with the rod with the possibility of reciprocating movement

relative to it, and a spring-loaded pin mounted in the stem cavity, characterized in that, in order to increase its reliability, the additional piston is made in the form of a 5 cylinder that forms an annular reservoir with the rod, separated by a damper with a damper

034

on the rod, filled with liquid and connected to the cavity of the rod by channels of larger and smaller sections, while the channels of a larger section are blocked by a spring-loaded finger, and the rod is equipped with a control valve that overlaps the channels of a smaller section NIN.

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Editor O. Yurkovetska

Fig.Z

Compiled by N. Chikhladze Tehred G. Gerber

Order 2447/46. Circulation 728 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, - Uzhgorod, Projecto st., 4

Proofreader A.T. sko

Claims (2)

Claim A device for exciting seismic waves, comprising a sleeve with a hollow rod and a piston forming a working chamber and a damper cavity, a hydraulic system, an additional piston located coaxially with the rod in the damper cavity with the possibility of reciprocating movement relative to it, and a spring-loaded pin mounted in the rod cavity, characterized in that, in order to increase its reliability, the additional piston is made in the form of a cylinder, forming with the rod an annular reservoir, separated from the damper cavity a washer rigidly fixed to the stem, filled with liquid and connected to the stem cavity by channels of larger and smaller cross-sections, while the channels of larger cross-section are covered with a spring-loaded finger, and the stem is equipped with a control valve that blocks the channels of the smaller cross-section. FIG. 2. Figz