SU649813A1 - Direct-action hydraulic percussive device - Google Patents

Description

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The invention relates to a drilling technique, namely to devices for hydropercussion drilling.

Known hydraulic hammer, comprising a housing, piston-peen and valve 1.

The closest known solution is an indirectly hydraulic hammer, comprising a body, a firing pin and a valve spring loaded on a sleeve {2J.

However, in well-known hydraulic hammers, the force of water hammering and throttling fluid through the channels connecting the VOLUME of the non-recurring volume to the pressure pipe is not sufficient for effective braking of the upwardly moving clan and clan. Increasing the stroke of the valve and the total stroke reduces the frequency of shocks.

The aim of the invention is to increase the drilling efficiency by decreasing the height of the valve and the piston rebound height.

This is achieved by the fact that the valve is made with axial and radial channels.

The drawing shows the proposed hammer, a longitudinal section.

The hydraulic hammer consists of adapter 1, body 2, valve 3 with spring 4 and bushing 5, cylinder 6 with cuff 7, piston striker 8 with spring 9 and splined connector 10.

Body parts — adapter 1, body 2 and cylinder 6 are rigidly connected to each other and to the split connector 10 with the possibility of axial movement. The housing 2 contains a punch 8, supported by a spring 9, and a sleeve 5 supported on the end face of a cylinder 6, in which

the valve 4 is located in the spring 4. When the slit connector is open, the flushing fluid flows freely through the axial and radial channels of the valve 3, the channels of the piston-8 and the splined connector 10

on the bottom. Hydraulic shock while not working.

Hydrosdarn works as follows. When setting the machine on the face, the spline connector closes, the borehole 8 with the spring 9 rises to the upper position before meeting the valve 3 and they continue to move upwards together (re-lift).

Shutting off fluid flow causes a sharp increase in pressure in the valve chamber (water hammer).

When the valve 3 moves towards the flow of fluid, its radial channels and

overlap the sleeve 5, increasing the hydraulic resistance for the passage of fluid from the cavity L to the cavity B.

At the moment of complete overlapping of these channels or earlier, the joint movement of the valve 3 and the piston –bike 8 upwards will be limited. In this case, an equilibrium of the acting forces will come: inertia of the piston movement on the one hand and hydraulic braking forces due to hydraulic shock and hydraulic differential in the regulated channels and the valve on the other.

Then the valve and the piston-block with the extension, its speed is mixed down, the springs 4 and 9 are compressed. The downward movement of the valve is limited by the end face of the cylinder 6, the fluid passage opens to the face, and the piston-hammer continues to move and blow at the end face of the spline connector 10. Under the action of the springs 4 and 9, respectively, first the valve 3 and then the piston head 8 return to the initial position and the cycle repeats.

Thus, in the hydraulic hammer an additional hydraulic braking

movement of the piston-blockage and valve upwards at the moment of their re-raising due to complete blocking of the radial channels of the valve and the formation of a closed cavity of a variable volume, which allowed to reduce the height of the valve's re-lift and piston-blocking and increase the frequency of impacts, i.e., increase the drilling efficiency.

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Claims (2)

1. USSR author's certificate No. 284916, cl. E 21B 5/00, 1969. 2. Graf L. E. et al. Hydraulic impact machines and tools. M., “Nedra, 1972, p. 64, rice 23.