DE2242920A1 - CONTROL DEVICE FOR THE FEED DRIVE OF A ROCK DRILLING MACHINE - Google Patents

Description

Patent attorneys Ii η2Β2Ό.

Dipl.-Ing. W. Beyer Dipl.-Wirtsch »-Ing. B. Jochem

6 Frankfurt am Main Freiherr-vom-Stein-Str.

Atlas Gopco AB '

Nacka / Sweden

Control device for the feed drive of a rock drilling machine ...

The invention relates to a control device for the feed drive with a pressurized gas motor for the Rotary drive and a hydraulic motor for the feed drive equipped rock drilling machine, in which in the pressure medium line of the feed motor is controlled as a function of the pressure conditions on the rotary motor Shut-off valve is arranged.

The purpose of such control devices is to prevent the drill string from getting stuck in the broken rock. For this purpose, the pressure medium inlet of the pre-lift motor is opened brought a low pressure · ,. if there is such a thing on the drill pipe great resistance to rotation occurs, * that there is a risk of jamming of the drill pipe consists in the rock. So that the jamming is really excluded with certainty, it is essential that the feed drive force is canceled very quickly. . , - ·;. "■

At 8578 / 8/30/1972

3098U / 0268

In a known control device of the above Art (US-PS 1 689 596 and 1 69o 5o4) becomes the one on the rise the rotational resistance on the drill pipe occurring pressure increase at the inlet of the rotary motor is used to a valve to change, by which the feed is reversed.

The invention is based on the task of the feed drive in the event of the risk of the drill pipe jamming, to be switched off even faster than before, and this is done according to the invention suggested that the shut-off valve on an occurring with increasing rotational resistance on the rotary motor Pressure reduction responds.

The invention is based on the observation that the time for reducing the pressure in a vessel by a certain Dimension is shorter than the time to increase the pressure by the same amount.

The invention is explained in more detail below with reference to the drawing. Show it:

1 shows a schematic representation of a first exemplary embodiment a control device according to the invention,

FIG. 2 shows the control device according to FIG. 1 with an additional Hegel device in the inlet line of the feed motor,

ig 3 shows a modification of the control device according to FIG Fig. 1 with regard to the attachment of a pressure sensor on the rotary motor.

In the embodiment of FIG. 1, a pressurized gas is used vane cell can be operated in both directions of rotation

At 8378 / 08/30/1972 3098U / 02Ö8

motor 1 as a rotary drive for a drill pipe, not shown. The engine 1 is powered by a pressurized gas supply via a conventional control valve (not shown) and a line 2 opening at inlet 3o with pressurized gas provided. The engine still has a main output. let 31 and a secondary outlet 32. At the latter is a line 3 connected for the return. If the engine ί is to be operated in reverse gear, the compressed gas is supplied in the opposite direction as normal.

For the advance and retraction movement of the drill rod with respect to the rock, a vane motor 4 of the same type as motor 1 is provided. The rotary motion of the motor 4 is transmitted as rectilinear motion to the drill string, e.g. in a conventional manner by means of a chain. The vane motor 4 can also be replaced by a double-acting power cylinder. He is with the advance of the drill string in the direction of the rock via a line 5 and an inlet 35 with Pressurized gas supplied. In addition to a main outlet 34, the engine 4 also has a secondary outlet 33 · In the line 5 · a shut-off valve 7 is arranged. To the secondary outlet 32 of the rotary motor 1 or a special one shown in FIG Outlet 4-5 is connected to a line I5 which leads to a connection 36 of a vent valve 9. A line 16 connects a further connection 37 of the vent valve 9 with a double-acting check valve 1o with three connections according to FIG. 1. In the vent valve 9 there is also a channel 38 and parallel a narrower channel is arranged for this purpose. The channel 38 connects the connection 37 with a cylinder space 41 in which a .Valve body 4o is slidably guided. The cylinder size 41 stands over one. Connection 39 with the outside atmosphere in prebinding. A line 14 connects the valve 1o with

At 857Ο / 3Ο.8.1972 _{3098U / 02e8}

the shut-off valve 7 'and the pressure in the line 14 and an adjustable spring 8 determine the position of the shut-off valve 7. A line 17 establishes a connection between the check valve 1o and a control valve 11. This is pressurized gas through a Line 12 supplied. Depending on the setting of the control valve 11, compressed gas can be supplied to the check valve 1o via the line 17 are supplied, whereby the valve body of the check valve in the opposite to the one drawn Position is shifted. This has the consequence that the pressurized gas reaches the cut-off valve 7 via line 14 and there the valve body in the opposite direction to the one drawn Position shifts. This makes it possible to use the feed motor 4 regardless of the operating conditions of the rotary motor 1 to operate.

In the embodiment of FIG. 2, the control device According to FIG. 1, a control device 18 ″ and a vent valve 19 are added in line 5 been. A line 2o connects the control device 18 to the line 14. In this way, a continuous control of the feed force can be obtained as long as the rotational resistance on the drill pipe is below the The value remains which leads to the switch-off valve 7 being switched. The vent valve 19 has the purpose that To connect line 5 with the outside atmosphere, if that Drill pipe is withdrawn from the rock.

The control device according to Fig. 1 functions as follows:

When the rotation resistance increases to the drill string, the rotational speed decreases the engine 1 ^ and as a consequence dor pressure drops at the auxiliary outlet 32. This wfclerum hi \ t a result, the valve body DNSS 4o in the vent valve 9 in din position shown displaced if the

At BW3O.8.1972 3 ₀ 9 _814/0268

Pressure drop is not too slow. The lines 16, 14 are then connected via the connection 37 »the channel 38 and the connection 39 to the outside atmosphere. As a result, the pressure in the lines 16, 17 drops very quickly to the level that prevails in the line 15. If the. Pressure in the line Λ 4 has fallen below a certain vert, which can be set by means of the adjustable spring 8, the shut-off valve 7 is reversed to the position shown, whereby the inlet 35 of the feed motor 4 is connected to the outside atmosphere. At the same time the line 5 "is closed so that an unnecessary outflow of compressed gas is prevented. In order to achieve the greatest possible speed when switching off, the line 15 between the connection 36 and the secondary outlet 32 or the special connection 45" on the rotary motor should be as short as If possible, the line 15 is omitted at all. In addition, the cut-off valve 7 should be arranged as close as possible to the inlet 35 of the feed motor 4.

Pat ent of sayings

At 8378 / 8/30/1972

3098U / 0268

Claims (6)

- ο - claims 1. Control device for the feed drive one with a compressed gas motor for the rotary drive and one Hydraulic motor equipped for the feed drive Rock drilling machine, in which in the pressure medium line of the feed motor, a shut-off valve controlled depending on the pressure conditions at the rotary motor is arranged, characterized in that the shut-off valve (7) responds to a pressure reduction (at 32 to 45) that occurs at the rotary motor (1) when the resistance to rotation increases. 2. Control device according to claim 1, d a d u r c h gekennzei chnet that the rotary motor (1) is designed as a vane motor. 3 · Control device according to claim 1 or 2 in conjunction with a rotary motor (1) with a main outlet and a secondary outlet, marked thereby, that the secondary outlet (32), at which the compressed gas is essentially completely relaxed ', via a Control line (15, 16, 14) is connected to the cut-off valve (7). ■. 4, control device according to one of claims 1 to 3 * characterized in that a vent valve (9) is arranged in the control line (I5, 16, 14), which the line part (16, 14) leading to the cut-off valve (7) The outer safety sphere opens when the pressure in this part of the outlet increases At 837ß / 3o.8.i972 309814/0268 is than in the line part (15) leading to the secondary outlet (32) of the rotary motor (1) 5 control device according to one of claims 1 to 4, characterized in that the Vent valve (9) by means of a throttle point only when the slowing down of the The rotary motor (1) can be switched to the position that opens to the outside atmosphere due to the greater rotary resistance is. 6. Control device according to one of claims 1 to 5> characterized by one at the Druckmxttelleitung (5) of the feed motor (4) arranged control device (18), which its speed regulates depending on changes in pressure at the rotary motor (1). At 8378 / 8/30/1972, 3U9'3U / G268