SU981717A1 - Hydraulic drive - Google Patents

Description

(54) HYDRAULIC DRIVE

The invention relates to actuator control hydraulic systems and relates to hydraulic control systems of a movable rotator of a drilling machine for drilling with core hydrotransport.

Hydraulic range containing the main and auxiliary hydraulic cylinders connected to the pressure and drain hydraulic lines through the main distributor and the auxiliary, made two-position, one line of which is connected to the main distributor line, the main hydraulic cylinder has the rod and piston cavities, the auxiliary hydraulic cylinder - damper and return cavities , the latter of which is connected by hydroline to one of the cavities of the main hydraulic cylinder and to one of the lines of the auxiliary distributor, two Its lines are respectively connected to the damper cavity of the auxiliary hydraulic cylinder, and to the hydraulic line (1.

A disadvantage of the known hydraulic system is the impossibility of carrying out, after reversing the executive body from any intermediate position, returning iiro to the initial position with damping at the end of the turn. Whereas cutting a drill rig down to the bottom after it has been consumed (the term “flowrate” refers to a mandatory technological operation during drilling, which involves periodically detaching the projectile from the bottom of the well to reduce torque) leads to

10 the occurrence of dynamic loads on the rock-cutting tool and causes the breakdown of the chisel bits, the cutting of diamonds or carbide cutters, which reduces the functional capabilities of the hydraulic system.

The purpose of the invention is to expand the functionality of the hydraulic drive.

The goal is achieved by

20 that the auxiliary distributor is made pilinear with one silenced line with which the return cavity is connected in one of the positions of the auxiliary distributor

25 of the auxiliary hydraulic cylinder, and the damper cavity is connected to the pressure gauge through the distribution valve.

The drawing shows the schema

Claims (2)

30 of the proposed hydraulic drive. The hydraulic drive contains main 1 and second hydraulic cylinders connected to pressure 3 and drain 4 hydraulic lines through the main valve 5 and auxiliary 6, which is made two-way, one line 7 of which is connected to line 8 of the main distributor 5, with the main hydraulic cylinder 1 It has a rod 9 and piston 10 cavities, an auxiliary hydraulic cylinder 2 - a damper 11 and a returnable 12 cavities, the latter of which is connected by a hydraulic line 13 to a piston cavity 10 of the main hydraulic cylinder 1 and one of lines 14 of the auxiliary distribution of bodies 6, two other lines 15 and 16 of which are respectively connected to the damper cavity 11 of the auxiliary hydraulic cylinder 2 of the discharge line 4. The auxiliary valve b is made five-line with one plugged line 17, with which in one 18) of positions 18 , 19 of the auxiliary distributor 6 is connected to the return cavity 12 of the auxiliary hydraulic cylinder 2, and the damper fern cavity 11 through both distributors 5 and 6 is connected to the pressure hydraulic line 3. The main distributor 5, made three-way positioned at positions 20, 21 and 22, connected to the rod cavity 9: the main hydraulic cylinder 1 by hydraulic line 23, ac to the auxiliary distributor 6 by hydraulic line 24, the piston 25 with the damper 26 separates the damping 11 in the auxiliary hydraulic cylinder 2 and returnable 12, which are connected to the auxiliary distributor 6 by the hydrolines, respectively, 27 and 28. The rod 29 of the hydraulic cylinder 1 is connected via a rotator 30 to a drill string 31 connected to a rock destructive tip 32. The hydraulic drive works as follows. The projectile can be consumed at any intermediate position of the rod 29 of the main hydraulic cylinder 1. When the projectile is consumed, the two-way auxiliary valve 6 is set to position 18, and the hydraulic cylinder 1 is controlled by the main valve 5. To lift the projectile, the main valve 5 is set to position 20 , and the oil from the pressure pipe 3 through the valve 5 and the hydraulic line 24, the valve 6 and the hydraulic line 27 enters the damping cavity 11 of the auxiliary hydraulic cylinder 2. The piston 25 creates pressure in the cavities 12 and 10 and moves the rod 29 of the hydraulic cylinder 1 and the rotator 30 associated with it with the drill pipes 31 upwards. The rod 29 of the hydraulic cylinder 1 can be moved by the operator to the remaining stroke or to a part of it. If the rod 29 of the hydraulic cylinder 1 is moved for the rest of the stroke, i.e. until the upper end position, the piston 25 of the auxiliary hydraulic cylinder 2 stops simultaneously with the rod 29. At the same time, there is no drainage from the cavity 12. If the rod 29 of the hydraulic cylinder 1 needs to be moved to a part of the stroke, this is ensured by switching at the required moment the main distributor 5 to position 22. (As one of the options, the stroke of the rod 29 of the hydraulic cylinder 1 may be limited by selecting the volume of the cavity 12 of the auxiliary hydraulic cylinder 2). To lower the projectile downhole, the main distributor 5 is positioned at position 22, and the oil from the pressure hydroline 3 through the distributor 5 and the hydroline 23 enters the rod end 9 of the hydraulic cylinder 1, while the piston 10 of the hydraulic cylinder 1 is drained into the auxiliary hydraulic cylinder 2, the damper cavity 11 of which is connected through the valve 6, the hydraulic line 24 and the valve 5 to the drain hydraulic line 4. The rod movement continues until the arrival of the piston 25 of the auxiliary hydraulic cylinder 2 to the left extreme point Proposition. Due to the fact that the piston 25 of the auxiliary hydraulic cylinder 2 starts its movement from the left extreme position when the projectile is raised, and when the projectile is lowered, returns to the same left extreme position, the rock-breaking tool 30 returns when the projectile is lowered to the same initial position. his rise was begun. The damper 26 slows down the movement of the rod 29 of the hydraulic cylinder 1 at the end of the stroke and the rock-breaking tip 32 smoothly contacts the face, i.e. ensures the return of the executive body after reversing to its original position with damping at the end of the turn. The application of the proposed hydraulic system is especially effective in drilling rigs designed for drilling with hydrotransport of the core, since with this method of drilling, the expenditure of the projectile is an indispensable technological operation, and ensuring a smooth lowering of the rock-breaking head on the bottomhole increases its radius. . Claims of the Invention A hydraulic actuator comprising a main and auxiliary hydraulic cylinders connected to a pressure and drain hydraulic lines through a main valve and an auxiliary one made of two positions, one line of which is connected to the main valve line, the main hydraulic cylinder having a rod and a piston cavity, an auxiliary hydraulic cylinder damper and return cavities The latter of which is connected by hydroline, to one of the cavities of the main hydraulic cylinder and to one of the lines of auxiliary distribution. divider, the other two lines which are respectively connected to dektfernoy cavity and vspomogatelnogogidrotsilindra to drain lines, characterized in that, in order to expand the functional capabilities of the hydraulic actuator, the auxiliary distributor is made five-liine with one a dead line with which the return cavity of the auxiliary hydraulic cylinder is connected to one of the positions of the auxiliary distributor, and the damper cavity through both the distributor is connected to a pressure head. Sources of information taken into account in the examination 1. USSR author's certificate  567855, class R 15 B 11/22, 1972. Jf