SU479867A1 - Device for rejection cutting screws - Google Patents

Description

one

This invention relates to controls of drilling rigs and can be used in auger machines.

Devices are known for deflecting the cutting augers, including cutting screws connected by cardans to drill stands, a pump driven by a drill rod, built into a support light serving as a reservoir for the working fluid, a hydraulic jack with a reverse slide valve, which is switched during axial displacement of the drill stem.

However, the known devices do not ensure the stable position of the screws in the extreme position due to the pulsating pressure created in the hydraulic jack.

The proposed device differs from the known fact that in the covers of the hydraulic jack there are installed plungers equipped with spring-loaded hydraulically balanced pushers interacting with the hydraulic jack in its end positions, and in the working lines of the hydraulic jack there is a discharge spool hydraulically connected with the plungers. This provides stabilization of the position of the cutting augers during drilling and unloading of the pump in the final positions of the screw.

The drawing shows the hydrokinematics scheme of the proposed device.

The cutting augers 1 are connected by a cardan 2 with drill stands 3 and have the possibility of limited axial displacement relative to the latter. A hydraulic jack 5 is fixed on the support lamp 4, the stem of which is connected to the flaps of jaws J in the jacks of the hydraulic jack 5 are fitted with plungers b p hydraulically balanced spring-loaded pushers 7. The cavities of the plungers are hydraulically connected to the spool 8 and unload through the check valves 9 to the working fluid reservoir which m serves as the reference lamp 4. In the reference lamp 4 is placed the pump 10 and the spool AND reverse. In working

line hydraulic jack 5 is installed hydrolock 12.

The device works as follows. In the course of direct drilling, the working fluid from the pump 10 driven by the drill stands 3 flows through the spools 11 and 8 into the reservoir of the working fluid. The fluid-filled cavities 5 are filled with liquid by a hydraulic lock 12, which ensures the fixation of the rod and the stable position of the cutting jaws 1. When removing the drill stands 3 from the well, the reverse spool 11 is switched, and the working fluid enters the piston cavity of the hydraulic jack

5, and its rod cavity connects with re

the fluid reservoir. There is a deviation of the cutting augers. At the end of the stroke, the piston of the hydraulic jack 1 acts on the plunger 6 through the pusher 7 entering the rod cavity. in the closed line moves the other plunger 6 to the right.

To return the cutting worm to its initial position, the drill is brought forward, the spool 11 is switched, and the working fluid enters the rod cavity of the hydraulic jack 5, and the piston cavity is connected to the fluid: The working fluid through the spool 8. The augers return to their original position . At the stroke of the stroke of the piston of the hydraulic cylinder 5, acting on the spring-loaded pusher 7 entering the piston cavity of the hydraulic cylinder moves the plunger 6 against the stop. There is a switching valve 8, that is, the unloading of the pump 10.

Subject invention

A device for deflecting the cutting augers, including cutting augers connected by cardan shafts, a pump driven by a drill rod, built in

a support lamp that serves as a reservoir for the working fluid, a hydrojack with a reverse slide valve, switchable With an axial displacement, a drilling head, characterized in that, in order to stabilize

cutting screws in the process of drilling and unloading the pump in the end positions of the screw, in the covers of the hydrojack plungers are installed, equipped with spring-loaded hydraulically balanced pushrods, interacting with the piston of the hydraulic slide in its end positions, and in the working lines of the hydraulic jack there is a discharge valve, hydraulically tiled with plungers.

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