JPS60112987A - Impact drilling apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to percussion drilling devices in which the pressure medium supply to the individual motors is opened and opened in dependence on the power to be generated.

In prior art drilling machines, especially hydraulic rock drills, three different motors are provided. The chisel must be turned via a rotary motor, and another motor is required to apply the impulses on the other side to the chisel. In order to feed the chisel into the rock, the machine-held rock drill must also be provided with its own feed motor. To produce a suitable drilling output, a rotating mechanism,
Tight alignment of the impact mechanism and feed motor must be achieved. This alignment is extremely difficult considering the different types of materials to be drilled. If the feed rate of the drilling machine is too large, a so-called binding may occur, for example, and damage to the chisel or the motor operating it can occur.

For the reasons mentioned above, it has already been proposed to connect the feed motor and the rotary motor in series in a hydraulic circuit in hydraulic drilling machines. This ensures that when the chisel rotates only slowly, as in the case of large loads, the feed is small but the control of the percussion device remains intact.

Therefore, irrespective of the resistance exerted by the rock, a constant energy impulse is generated, which damages the impact mechanism and at the same time results in an undesirably small advance.

A hydraulic drilling depth for impact drilling is known from US Pat. No. 3,979,944, which has a rotation mechanism, a percussion mechanism and a feed motor. Rotation v! The A mechanism, the percussion mechanism and the feed motor are hydraulically connected to each other and three independently operating hydraulic pumps are provided. The hydraulic circuit of the feed motor has an on-off valve. The hydraulic circuit of the rotation mechanism is connected to the hydraulic circuit of the impact mechanism via a valve. The role of this valve is to open when the pressure in the rotating mechanism circuit is low and to balance the pressure between the hydraulic pressure circuit for the impact mechanism and the hydraulic pressure circuit for the rotating machine groove. Furthermore, the hydraulic circuit of the feed motor is directly connected to the hydraulic circuit of the percussion mechanism via a valve, so that as the pressure of the percussion mechanism decreases, the pressure of the feed motor circuit also decreases. An opening/opening line branches off from the pressure medium line of the rotating mechanism, and via this control line a valve in the percussion circuit can be actuated, thereby making it possible to reduce the pressure in the percussion mechanism circuit.

From the percussion mechanism circuit, a side leg conduit branches off again to a valve, which performs a reversal of the direction of movement of the feed motor.

However, such control is not suitable for complex applications due to its large inertia. This inertia causes a pressure increase in the rotating mechanism circuit to cause a pressure decrease in the impact mechanism circuit,
This occurs because the reduced pressure in the 8 mechanism circuit causes a reversal of the rotational direction of the feed motor. A reversal of the direction of movement of the feed motor takes place again only when a suitable pressure buildup has occurred in the percussion mechanism circuit. In the case of a forward movement, the drilling machine therefore makes an unnecessary impact or does not make a complete impact on the rock, which can lead to corresponding long-term damage to the drilling machine. Furthermore, if the resistance of the rock is particularly low due to the inclusion of cavities, especially soft rocks, a pressure drop will occur in the percussion mechanism, which will cause the drilling device to be pulled back again, which has no reason in terms of drilling technology.

Object of the Invention The object of the present invention is to avoid binding of the chisel in the rock when the rock properties are different and the drilling progresses significantly, and at the same time avoid unnecessary delays during changeover and unnecessary impact on the equipment. It is an object of the present invention to provide an impact perforation device capable of

Means for achieving this purpose: A rotary puller groove and a feed motor, which can be driven by a pressure medium, in particular a pressure fluid, are connected to one or more pressure sources via pressure fs: body conduits with regulating mechanisms, e.g. valves, etc. According to the present invention, in a rock percussion drilling device provided with a pressure medium conduit, in particular a pressure medium supply conduit of a rotating mechanism, and a control conduit leading from a pressure medium supply conduit of a rotating mechanism to a control BR structure in a pressure medium conduit of an impact mechanism. v! A structure? # The pressure medium supply conduits leading to the percussion mechanism and the feed motor are provided separately from each other or in parallel, and in particular from the pressure medium supply conduit of the rotation mechanism to the rotation mechanism OW iif by the positive pressure present in the pressure medium supply conduit of this rotation mechanism. A control line is provided which leads to the pressure medium line, in particular the percussion mechanism, the feed motor and possibly the adjustment mechanism in the pressure medium supply line of the rotating mechanism.

Effects of the Invention With such a device, if the pressure rises above a limit value, for example in a rotating mechanism, as occurs when the resistance of the rock is large, the pressure medium supply to the impact mechanism is throttled or interrupted and at the same time the rotating mechanism It is also possible to control the feed motor by reversing the direction of rotation by changing the pressure in the circuit. Such a device therefore makes it possible to reduce or even eliminate the impact energy when the pressure builds up in the supply line of the rotating mechanism and to pull the chisel out of the hole. The pressure in the rotating mechanism is thereby reduced again, so that simultaneously or with a delay via the throttle, a reversal of the direction of movement of the feed motor can take place again and the impact energy of the percussion mechanism can be increased.

The pressure medium line of the rotating mechanism and at least one control line leading to the percussion mechanism and/or the adjustment mechanism of the feed motor are optionally connected to conduct the pressure medium of the rotating mechanism and in a pressure-tight manner. In this case, the pressure medium can be used directly as a control medium, thereby avoiding inertia due to intermediates such as intermediate switches and the like.

At least one control O pipe is connected to a regulating mechanism in a further control conduit having a medium, in particular compressed air, and is connected to a regulating mechanism in a pressure medium supply conduit to a pressure medium circuit dedicated to this other control. When connected, the adjustment mechanism can be operated particularly easily and effectively, and the equipment costs are kept particularly low.

A pressure-operable electric switch is provided in the pressure medium supply conduit of the rotary machine groove so that one or more pressures above and (
or) a particularly versatile control can be carried out by opening the electrical circuit and thereby controlling at least one electrically actuable regulating arrangement in the pressure medium conduit, in which case the electrical circuit can be used to control the machine. Particularly fast reactions and delays, whose size can be taken into account particularly advantageously, can be easily defined.

Example: A diagram schematically showing the circuit of a temporary liquid discharge perforator,
The invention will be explained in detail below.

Three pressure medium circuits 1, 2 and 3 are provided, each having an interrogating pump 4, 5 and 6 as pressure sources. The pressure medium circuit 1 is used to operate the motor 7 for the rotating mechanism. This pressure medium circuit is provided with an adjustment mechanism 8, which allows on the one hand the short-circuited position of the pressure medium circuit of the pump 4 () and also two different speeds of the rotating mechanism. The regulating mechanism 8, for example a valve spool, can be operated by a solenoid 9, which is pressure-responsive J5.
It is operable via the closure 10 and the power supply II. This pressure response period I! J(rd+o has control 'aC pipe 12,
This control conduit 12 is connected to the rotating machine ra immediately before the rotating mechanism 7.
Pressure medium supply conduit leading to 7] 3. With such a connection, if the pressure in the supply conduit 13 leading to the rotating mechanism 7 exceeds a certain value, the regulating mechanism 8 is actuated and thereby the rotational speed is changed or the supply of pressure medium to the rotating mechanism 7 is changed. can be interrupted. Then, for example, the chisel is partially withdrawn from the bore so that when the pressure has decreased, pressure medium can be supplied again or the rotational speed of the rotating mechanism 7 can be varied.

The pressure medium circuit 2 has a percussion motor 14, and the adjustment groove I5 provided in this circuit is held in its position via a spring 16. The adjusting mechanism 15 furthermore has a piston-cylinder arrangement 17 whose pressure space is connected via a control line 18 to the pressure medium supply line 13 of the rotating mechanism 7 . If the pressure in the pressure medium supply conduit 13 of the rotating mechanism 7 increases, for example when a certain limit value is exceeded, the regulating mechanism 15 is actuated via the piston-cylinder arrangement 17 through which the working medium of the hydraulic circuit for the rotating mechanism 7 flows. , thereby bringing the adjustment mechanism 15 from the open position shown in the figures to the closed position. When the pressure in the rotating machine groove 7 decreases, splashing]
6, the adjustment mechanism 15 is pushed back to the nail bolt rtt+ release position. It is also possible for the pressure medium circuit 2 to be provided with a regulator @ 19 of the agency, for example to relieve the pressure in the pressure medium circuit.

The pressure medium circuit 3 is provided with a feed motor 20, the direction of rotation of which is reversed via an adjustment mechanism 21, or the i(& pressure circuit of the pump 6 is short-circuited so that no pressure medium reaches the feed motor 20. Adjustment mechanism 2
1 is a piston-cylinder device 22 having two pressure spaces
have. Control conduits 23, 24 through which a solid hydrogen control medium, for example compressed air, leads into these pressure spaces. These controls, conduits 23, -24, lead to a regulating a-channel 25, which regulator, W25, is connected to a source of compressed air 26. The adjusting mechanism 25 has a spring 27 and a piston-cylinder arrangement 28 , which is connected via a control line 29 to the pressure medium supply line 13 of the rotary motor 5 . If the pressure in this pressure medium supply conduit 13 exceeds a certain value, the regulating mechanism 25 is actuated so that the conduit 23.
The direction of flow of the compressed air in 24 is reversed, thereby operating the adjustment mechanism 21 to reverse the direction of rotation of the feed motor 20. When the pressure decreases, the adjustment mechanism 25 is actuated by the spring 27, so that the feeding direction of Mtl'JJ is again obtained.

Furthermore, when the resistance increases during impact drilling of rocks, the following process occurs. First of all, due to a rise in the pressure in the IS supply conduit 13, the operation of the percussion mechanism 14 is interrupted or continued with a small amount of energy, and at the same time the feed motor 20 changes its direction of rotation, so that the chisel remains constant. Come out from the hole. As a result, the pressure in the supply conduit 13 of the rotating mechanism 7 is reduced by 4, so that the direction of rotation of the feed motor 20 is changed, so that the feed motor 20 rotates again in the drilling direction. The balancing energy of the impact mechanism 14 is then again increased as desired. Now, if a large resistance arises again, the process described above is repeated, i.e., the large resistance of the rock causes a reciprocating movement, which on the one hand rejuvenates the damage to the entire J apparatus, including the chisel, and on the other hand, especially A high chisel Ml progression is performed.

[Brief explanation of the drawing]

] i is a hydraulic circuit diagram of an aspiration device according to the present invention. 1-3...Pressure medium/body circuit, 4-6...Pressure source (pump), 7...Rotating mechanism (motor), 8.15°21
...Adjustment mechanism, 12.18.29...Control conduit, 1
3...Pressure supply conduit, 14...Impact mechanism (motor)
, 20... feed motor

Claims (1)

[Claims] 1. A rotation mechanism, a percussion mechanism and a feed motor capable of being driven by a pressure medium, in particular a pressure liquid, are connected to one or more pressure sources via a pressure medium conduit with a regulating mechanism, e.g. a valve, etc. The rotating mechanism (7), the percussion mechanism (14) and the step are connected and are provided with a control conduit leading from the pressure medium conduit, in particular the pressure medium supply conduit of the rotating mechanism, to the regulating mechanism in the pressure medium conduit of the percussion mechanism. Pressure medium supply conduits leading to the rotary motor (20) are provided separately or in parallel with each other, from the pressure medium supply conduit (13) of the rotating mechanism (7) to this rotary machine groove (7), in particular immediately before the rotating mechanism (7). ) can be controlled by positive pressure in the pressure medium supply conduit of the pressure medium conduit, in particular of the percussion mechanism (14), the feed motor (20) and possibly the adjusting mechanism in the pressure medium supply conduit of the rotation mechanism (7). (8+ ]L2] ) to 15 system iaI1
An impact drilling device for rocks, etc., characterized in that it is equipped with a g-tube (+2.18.29). 2. At least one mechanical conduit () leading from the pressure medium/body supply conduit @ (+3) of the rotating machine groove (7) to the adjustment mechanism (15, 25) of the impact mechanism (14) and/or the feed motor (2o). 18, 29) are connected in a pressure-tight manner so as to conduct a pressure medium of the rotating mechanism as the case may be. 3. At least one control conduit (29) has a further control conduit (29) with a side leg medium, in particular compressed air. This further control oil conduit (23, 24) is connected to the adjustment mechanism (28) in the pressure medium supply conduit (3, 24), in particular the pressure medium supply conduit (21). 2. Device according to claim 1, characterized in that the device is connected to: 4 Pressure in rotating machine groove (7) 11J1. A pressure-operable electrical switch (10) is provided in the body supply conduit to open and close the electrical circuit above and/or below one or more pressures, thereby switching off at least one electrical circuit in the pressure medium conduit. 2. Device according to claim 1, characterized in that the adjustment mechanism (8) operable at the side is lateral. 5. Device according to claim 1, characterized in that all control conduits leading to the regulating mechanism are likewise particularly capable of supplying compressed air.