JP3514916B2 - Drilling control device for hydraulic crawler drill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling control device for a hydraulic crawler drill which can be controlled so as to reduce the thrust of a feed mechanism when rotational resistance increases during drilling.

[0002]

2. Description of the Related Art Generally, a hydraulic crawler drill has a striking mechanism 1 and a rotating mechanism 2 which are hydraulically driven, as shown in FIG.
And a feed mechanism 4 of the rock drill 3 are provided, and the striking mechanism 1 strikes the drilling rod and the rotating mechanism 2 rotates the drilling rod. The feed mechanism 4 gives thrust to the drilling rod to drill the rock.

Conventionally, the striking mechanism 1, the rotating mechanism 2, and the feeding mechanism 4 are driven by independent hydraulic circuits. And the drilling control of this hydraulic crawler drill is
The operator manually operates the percussion operation switching valve (not shown), the rotation operation switching valve (not shown), and the feed operation switching valve (not shown) to set the high pressure line PH and the low pressure line PL of the percussion mechanism 1. ,
This is performed by switching the supply of pressure oil to the forward rotation conduit RF, the reverse rotation conduit RR of the rotating mechanism 2, the forward conduit FF, and the backward conduit FR of the feed mechanism.

Generally, in hydraulic crawler drills, compared with a drill jumbo, it is necessary to add a plurality of rods in order to drill a long hole, and to collect the rods. However, since the work of adding the rods and collecting the rods is complicated, the rods are complicated. It is equipped with a changer, and in recent years, rods have been replenished and recovery work has been automated. Therefore, add rods,
In the screw disconnection process of the rod of the recovery work, it is necessary to control the backward speed to be low in order to move the rock drill 3 backward by the screw pitch in synchronization with the slow reverse rotation operation of the rod.

Further, since the hydraulic crawler drill has a long drilling length for one drilling, the drilling machine 3 in the non-drilling state takes a long time to move on the guide shell, resulting in a long cycle time. Therefore, when the rock drill 3 moves on the guide shell in the non-drilled state, fast-forward control must be performed so that it can move faster than in the drilled state. In addition, because the holes are deep, it is often the case that dust is easily caught in the holes and it is necessary to frequently perform hole cleaning. In that case, the fast-forwarding control with a high moving speed can shorten the hole cleaning work time. it can.

Therefore, as feed control of the hydraulic crawler drill, a feed speed in a normal drilling state, a rod replenishment, a slow retreat speed in a screw cutting process in a recovery operation, and a fast feed speed in a non-drilling state are required. Must be switched over and properly controlled.

For this reason, in the hydraulic circuit of the feed mechanism 4 of the hydraulic crawler drill, the pressure reducing valve 6 and the check valve 7 are provided in parallel in the middle of the forward conduit FF, and the reverse conduit FR and the forward conduit FF are provided.
A reverse pressure adjusting relief valve 8 is provided between the pressure reducing valve 6 and the backward pressure adjusting relief valve 8, and a fast feed switching solenoid valve 9 is provided downstream of the reverse pressure adjusting relief valve 8. The forward flow path FF is provided with a forward flow rate adjusting valve 10 and a check valve 11 in parallel with the fast-forward switching electromagnetic valve 9, and the reverse flow path FR is provided.
The reverse flow rate adjusting valve 12 is provided in parallel with the rapid-feed switching solenoid valve 9.
And a check valve 13 are provided.

The pressure of the pressure oil supplied to the feed motor 5 of the feed mechanism 4 when the rock drill 3 is moved forward is controlled by the pressure reducing valve 6. The forward pressure adjusting relief valve 1 is connected to the working pressure control port of the pressure reducing valve 6 via the forward pressure switching solenoid valve 14.
5, the output side pressure of the pressure reducing valve 6 is normally set as the set pressure of the forward pressure adjusting relief valve 15, and when the forward pressure switching solenoid valve 14 is switched, the output side pressure of the pressure reducing valve 6 is reduced. It becomes the maximum set pressure of the valve 6 main body. The reason why the pressure on the forward side is constantly controlled by the pressure reducing valve 6 in this manner is to stabilize the feed during drilling. The pressure of the pressure oil supplied to the feed motor 5 of the feed mechanism 4 when the rock drill 3 moves backward is controlled within the range of the set pressure of the reverse pressure adjusting relief valve 8.

The fast-forward switching solenoid valve 9 is normally closed, and during normal drilling, the pressure oil supplied to the forward conduit FF passes from the pressure reducing valve 6 through the forward flow rate adjusting valve 10,
It is supplied to the feed motor 5 of the feeding mechanism 4. The return oil from the feed motor 5 bypasses the reverse flow rate adjusting valve 12 by the check valve 13 and flows out from the reverse conduit FR. At this time, the pressure of the pressure oil supplied to the feed motor 5 becomes the set pressure of the pressure reducing valve 6, that is, the set pressure of the forward pressure adjusting relief valve 15, and the flow rate becomes the set flow rate of the forward flow rate adjusting valve 10, and the drill rocks. A predetermined thrust and forward speed are applied to the machine 3 by the feed mechanism 4.

When the rod is replenished and the screw is removed in the recovery process at a low speed, the pressure oil supplied to the retreating conduit FR passes through the retreating flow rate adjusting valve 12 and is fed to the feed mechanism 4.
Is supplied to the feed motor 5. The return oil from the feed motor 5 bypasses the forward flow rate adjusting valve 10 with the check valve 11, bypasses the pressure reducing valve 6 with the check valve 7, and the forward flow path F.
Outflow from F. At this time, the pressure of the pressure oil supplied to the feed motor 5 becomes the set pressure of the backward pressure adjusting relief valve 8, the flow rate becomes the set flow rate of the backward flow adjusting valve 12, and the rock drill 3 is fed to the feed mechanism 4 by the feed mechanism 4. Provides a predetermined slow reverse speed.

During rapid feed in the non-drilled state, the rapid feed switching solenoid valve 9 and the forward pressure switching solenoid valve 14 are switched. At the time of fast forward advance, the pressure oil supplied to the forward conduit FF is supplied from the pressure reducing valve 6 through the fast forward switching electromagnetic valve 9 to the feed motor 5 of the feed mechanism 4. Return oil from the feed motor 5 passes through the check valve 13 and the fast-forward switching electromagnetic valve 9 and flows out from the reverse conduit FR. At this time, the pressure of the pressure oil supplied to the feed motor 5 becomes the maximum set pressure of the main body of the pressure reducing valve 6, and the forward flow rate adjusting valve 1
Since it does not pass through 0, the flow rate becomes maximum, and the rock drill 3 is given a large thrust and a high forward speed by the feed mechanism 4.

At the time of fast-forward reverse, the pressure oil supplied to the reverse-reverse pipeline FR is supplied to the feed motor 5 of the feed mechanism 4 through the fast-forward switching electromagnetic valve 9. The return oil from the feed motor 5 passes through the check valve 11 and the fast-forward switching electromagnetic valve 9, bypasses the pressure reducing valve 6 by the check valve 7, and flows out from the forward conduit FF. At this time, the pressure of the pressure oil supplied to the feed motor 5 becomes the set pressure of the backward pressure adjusting relief valve 8 and does not pass through the backward flow rate adjusting valve 12, so the flow rate becomes the maximum, and The feed mechanism 4 provides a high retreat speed.

[0013]

During drilling work, the condition of rock mass may suddenly change and, for example, a soft stratum, cracks or cavities may be encountered. In such a case, unless the thrust of the feed mechanism 4 is immediately controlled, hole bending will occur, or it will be difficult to discharge the powder and the rotational resistance will increase. It will be possible. However, since the state inside the bedrock cannot be recognized from the outside, it is extremely difficult for the operator to appropriately control the feed mechanism 4 according to the change in the state of the bedrock.

Therefore, the normal rotation line of the rotary mechanism of the hydraulic rock drill and the reverse line of the feed mechanism are connected via the flow rate adjusting valve and the pilot switching valve, and the pilot switching valve is switched when the striking mechanism is activated. By connecting the forward and reverse paths to each other, the hydraulic pressure can be controlled to automatically suppress the thrust as the rotational resistance increases when the rotational resistance increases due to changes in the rock mass. A feed control device for a rock drill has been proposed (see Japanese Patent Application No. 6-306670).

However, although the feed control device of the hydraulic rock drill can be used in the drill jumbo, in the hydraulic crawler drill, the feed speed control is complicated due to the equipment of the rod changer as described above, and various feeding mechanisms are used. Since the hydraulic control device is provided, there is a problem that it cannot be used effectively.

The present invention solves the above problem in a hydraulic crawler drill, and can control so as to reduce the thrust of the feed mechanism when the rotational resistance increases in the drilling hole, by adding rods, An object of the present invention is to provide a hydraulic crawler drill capable of appropriately controlling the low speed retreat speed in the screw cutting step in the recovery operation and the fast feed speed in the non-drilling state as needed.

[0017]

A drilling control device of the present invention comprises a rock drill having a hydraulically driven striking mechanism and a rotating mechanism, and a feed mechanism for the rock drill, and a forward pipe of the feed mechanism. A solenoid valve for fast-forward switching is provided in the middle of the passage and the reverse passage, and a pressure reducing valve and a check valve are provided in parallel on the upstream side of the solenoid valve for rapid-feed switching in the forward pipeline, in parallel with the solenoid valve for rapid-feed switching. A forward flow rate adjustment valve and a check valve are provided, and a reverse pressure adjustment relief valve is provided upstream of the fast-forward switching solenoid valve in the reverse line, and the reverse flow rate adjustment valve and the reverse check are provided in parallel with the fast-forward switching solenoid valve. Valve and the hydraulic pressure crawler drill with the forward pressure adjusting relief valve connected to the working pressure control port of the pressure reducing valve via the forward pressure switching solenoid valve. Between the actuator and the pilot switching valve and the check valve Installed in parallel, a connecting line that connects the reverse line and the normal rotation line of the rotating mechanism via a pilot switching valve was installed, and an orifice and a check valve were installed in parallel in the middle of the connecting line to switch the pilot. The pilot line connected to the pilot port of the valve is connected to the forward rotation line via the pilot switching solenoid valve and is also connected to the tank via the orifice.

When performing the drilling operation, during the normal drilling, the drilling of pressure oil to the striking mechanism, the rotating mechanism and the feeding mechanism is started. The drilling machine gives the rod a hit and a normal rotation. The pressure oil supplied to the advancing line is supplied from the pressure reducing valve through the advancing flow rate adjusting valve to the feeding mechanism. At this time, the pressure oil in the normal rotation pipe switches the pilot switching valve, so the return oil from the feed mechanism flows out to the normal rotation pipe through the connection pipe. The flow rate is adjusted by the forward flow rate adjusting valve and the orifice to give a predetermined forward speed. The pressure of the pressure oil supplied from the advancing line to the feed mechanism is the setting pressure of the pressure reducing valve, that is, the setting pressure of the relief valve for adjusting the advancing pressure. As a result, due to the difference between the forward force generated by the pressure of the forward passage of the feed mechanism and the backward force generated by the pressure of the forward rotation passage of the rotating mechanism,
The feed mechanism gives thrust to the rock drill.

When the rock condition changes during drilling and the rotational resistance of the rod increases, the pressure in the forward rotation passage of the rotation mechanism rises, so the forward force due to the pressure in the forward passage of the feed mechanism and rotation The difference in the retracting force due to the pressure in the forward rotation path of the mechanism is reduced, and the thrust of the feed mechanism is reduced. When the rotation resistance further increases and the pressure in the forward rotation duct of the rotation mechanism rises, the thrust of the feed mechanism becomes 0 and the forward movement is stopped. When the backward force exceeds the forward force, the feed mechanism causes the rock drill to move. Retreat.

When the rotation resistance decreases and the pressure in the normal rotation duct of the rotating mechanism returns to normal, the thrust of the feed mechanism also returns to normal. When the drilling hole is completed and the rotation mechanism is stopped, the supply of pressure oil to the pilot port of the pilot switching valve is stopped, so the pilot switching valve cuts off the communication between the retreating pipeline of the feeding mechanism and the connecting pipeline. .

When the rod is replenished and the screw is removed at a low speed in the recovery operation, the rotating mechanism is reversed, so that the pressure oil is supplied to the reverse rotation conduit. Since the forward rotation pipeline has low pressure, the pilot switching valve does not switch. Therefore,
The pressure oil supplied to the reverse line is supplied to the feed mechanism through the reverse flow rate adjusting valve, and the return oil from the feed mechanism bypasses the forward flow rate adjusting valve and the pressure reducing valve with a check valve, Run off the road. At this time, the pressure of the pressure oil supplied to the feed mechanism becomes the set pressure of the reverse pressure adjusting relief valve, and the flow rate becomes the set flow rate of the reverse flow rate adjusting valve. Speed is given.

During rapid feed in the non-drilled state, the rapid feed switching solenoid valve, the forward pressure switching solenoid valve, and the pilot switching solenoid valve are switched. At the time of fast forward advance, the pressure oil supplied to the forward pipeline is supplied from the pressure reducing valve through the fast forward switching solenoid valve to the feed mechanism. At this time, if the pilot switching valve is switched, the return oil from the feed mechanism will be throttled by the orifice of the connecting conduit and fast-forwarding will not be possible.Therefore, switching between the fast-forwarding switching solenoid valve and the forward pressure switching solenoid valve will not be possible. At the same time, the pilot switching solenoid valve can be switched. Since the pilot switching valve does not switch, the return oil from the feed mechanism flows out from the backward passage through the rapid-feed switching solenoid valve. At this time, the pressure of the pressure oil supplied to the feed mechanism becomes the maximum set pressure of the pressure reducing valve body,
Further, since it does not pass through the forward flow rate adjusting valve, the flow rate is maximized and the rock drill is given a large thrust and a high forward speed by the feed mechanism.

At the time of fast-forward reverse, the pressure oil supplied to the reverse-reverse line is supplied to the feed mechanism through the fast-forward switching solenoid valve. Return oil from the feed mechanism passes through the rapid-feed switching solenoid valve, bypasses the pressure reducing valve with the check valve, and flows out from the forward passage. At this time, the pressure of the pressure oil supplied to the feed mechanism becomes the set pressure of the backward pressure adjusting relief valve and does not pass through the backward flow rate adjusting valve. The reverse speed is given.

The forward pressure adjusting relief valve sets the supply pressure to the feed mechanism at the time of drilling, and at this time, the reverse pipe line and the forward rotation circuit communicate with each other through the connection pipe line to advance the feed mechanism. Since the difference between the forward force generated by the pressure in the pipeline and the backward force generated by the pressure in the normal rotation line of the rotating mechanism gives thrust to the rock drill from the feed mechanism, only the pressure of the normal rotation line is applied. , High pressure is set.

However, if the set pressure is high, when the rotation is stopped and only the forward movement is performed, the thrust is too strong and the operability of the drilling work is deteriorated. Provide a low pressure relief valve in parallel with the forward pressure adjusting relief valve, connect the low pressure relief valve to the tank via the low pressure switching pilot switching valve, and connect the pilot port of the low pressure switching pilot switching valve to the pilot line. Therefore, when rotation is stopped and only forward operation is performed, the pilot switching valve cuts off the communication of the connecting pipeline, and at the same time the pilot switching valve for low pressure switching returns to neutral, and the pressure in the forward pipeline is the set pressure of the low pressure relief valve. Therefore, it is possible to prevent the thrust from becoming excessive.

[0026]

1 is a hydraulic circuit diagram of a drilling control device for a hydraulic crawler drill showing an embodiment of the present invention.

In this hydraulic crawler drill, a rock drilling machine 3 having a hitting mechanism 1 and a rotating mechanism 2 which are hydraulically driven,
And a feed mechanism 4 for the rock drill 3 and a striking mechanism 1
The drilling rod is hit, the rotating mechanism 2 rotates the drilling rod, and the feed mechanism 4 applies thrust to the drilling rod to drill the rock mass.

Although the feed motor 5 is used as the hydraulic actuator of the feed mechanism 4, a hydraulic cylinder or the like may be used. The drilling control of the hydraulic crawler drill is performed by the high pressure line PH, the low pressure line PL of the striking mechanism 1, the forward rotation route RF, the reverse rotation route RR of the rotating mechanism 2, the forward passage FF and the backward passage FR of the feed mechanism. This is done by switching the supply of pressure oil to the.

Forward line FF and reverse line FR of the feed mechanism 4
The rapid feed switching solenoid valve 9 is provided in the middle of the, and the forward feed line FF is provided with the pressure reducing valve 6 and the check valve 7 in parallel on the upstream side of the rapid feed switching solenoid valve 9, and the rapid feed switching solenoid valve is provided. A forward flow rate adjusting valve 10 and a check valve 11 are provided in parallel with 9. A reverse pressure adjusting relief valve 8 is provided on the upstream side of the fast-forward switching electromagnetic valve 9 in the reverse conduit FR, and a reverse flow rate adjusting valve 12 and a check valve 13 are provided in parallel with the fast-forward switching electromagnetic valve 9. ing.

A forward pressure adjusting relief valve 1 is connected to an operating pressure control port of the pressure reducing valve 6 via a forward pressure switching solenoid valve 14.
5 is connected. A low pressure relief valve 20 is provided in parallel with the forward pressure adjusting relief valve 14, and the low pressure relief valve 20 is connected to the tank 22 via a low pressure switching pilot switching valve 21.

A pilot switching valve 23 and a check valve 24 are provided in parallel between the backward flow rate adjusting valve 12 of the backward pipeline FR and the feed motor 5 of the feeding mechanism 4, and the pilot switching valve 23 is used to move backward. Pipe line FR and normal rotation pipe line R of rotating mechanism 2
A connecting pipe C for connecting with F is provided. An orifice 25 and a check valve 26 are provided in parallel in the middle of the connection conduit C. The orifice 25 surely causes the pilot switching valve 23 to return to the spring when only the rotation is stopped after the rotation and the feed are simultaneously operating. Without this orifice 25, when only the rotation is stopped, a pressure is generated by the hydraulic oil flowing from the feed mechanism to the forward rotation switching passage RF through the pilot switching valve 23 to cause a normal rotation malfunction.

The pilot conduit P connected to the pilot port of the pilot switching valve 23 is connected to the forward rotation conduit RF via the pilot switching electromagnetic valve 27 and to the tank 22 via the orifice 28. ing. The orifice 28 releases the pilot port pressure of the pilot switching valve 23 when the pilot switching solenoid valve 27 is activated.

The pilot switching valve 23, the check valve 24, the orifice 25, the check valve 26, the pilot switching solenoid valve, the orifice 28, the low pressure relief valve 20, and the low pressure switching pilot switching valve 21 are manufactured as one block. , Can be easily attached to conventional hydraulic crawler drills.

In the hydraulic crawler drill, since the guide shell is set upright when stopped, the feed motor 5 is
A brake 16 is provided to prevent the rock drill 3 from falling. The brake 16 is released when pressure oil is supplied to the feed motor 5 when moving forward or backward, and the brake 16 is activated when the supply of pressure oil is stopped.

When performing the drilling operation, during the normal drilling, the punching hole for feeding the pressure oil to the striking mechanism 1, the rotating mechanism 2 and the feeding mechanism 4 is started. The drilling machine 3 gives a hit and a normal rotation to the rod. The pressure oil supplied to the forward conduit FF is supplied to the feed mechanism 4 from the pressure reducing valve 6 through the forward flow rate adjusting valve 10. At this time, the pressure oil in the forward rotation conduit RF switches between the pilot switching valve 23 and the low pressure switching pilot switching valve 21. The return oil from the feed mechanism 4 passes through the connection pipe C and flows out to the normal rotation pipe RF.

The flow rate is controlled by the forward flow rate adjusting valve 10 and the orifice 2.
It is adjusted at 5 to give a predetermined forward speed. Forward line F
The pressure of the pressure oil supplied from F to the feed mechanism 4 is the pressure reducing valve 6
Is set pressure, that is, the set pressure of the forward pressure adjusting relief valve 15. At this time, the reverse conduit FR and the normal rotation circuit RF communicate with each other through the connection conduit C, and the forward force generated by the pressure in the forward conduit FF of the feed mechanism 4 and the forward rotation conduit RF of the rotation mechanism 2 are connected.
The difference between the retracting force generated by the pressure of
Since the thrust to the rock drill 3 is applied, the forward pressure adjusting relief valve 15 has a pressure corresponding to the pressure of the forward rotation conduit RF,
High pressure is set. Here, the pressure of Seitenkanro RF and 50 kgf / cm ² or so, the forward pressure regulating relief valve 15 for maintaining the normal feed pressure of about 50 kgf / cm ² sets the pressure at about 100 kgf / cm ² ing.

When the rock mass changes in the drilling hole and the rotation resistance of the rod increases, the pressure in the forward rotation passage RF of the rotation mechanism 2 rises, so that the feed mechanism 4 moves forward due to the pressure in the forward movement passage FF. The difference between the force and the backward force due to the pressure in the normal rotation path RF of the rotating mechanism 2 is reduced, and the thrust of the feeding mechanism 4 is reduced.
When the rotation resistance further increases and the pressure in the forward rotation path RF of the rotation mechanism 2 rises, the thrust of the feed mechanism 4 becomes 0 and the forward movement is stopped. When the backward force exceeds the forward force, the feed mechanism 4 becomes Move the drilling machine 3 back.

When the rotational resistance decreases and the pressure in the forward rotation passage RF of the rotating mechanism 2 returns to normal, the thrust of the feed mechanism 4 also returns to normal. The same applies to the case of forward rotation without hitting.

When the drilling is completed and the rotation mechanism 2 is stopped,
Since the supply of the pressure oil to the pit port of the pilot switching valve 23 is stopped, the pilot switching valve 23 returns to the neutral state and cuts off the communication between the reverse pipe FR of the feed mechanism 4 and the connecting pipe C.

When the set pressure of the forward conduit FF is high, when the rotation is stopped and only the forward operation is performed, the thrust is too strong and the operability of the drilling work is deteriorated. For example, when the bit is pressed against the rock during cleaning of the hole, the thrust may be too strong and the guide shell may float up. At this time, the operator can manually adjust the set pressure of the forward pressure adjusting relief valve 15 to a low pressure, but here, the low pressure relief valve 2 is arranged in parallel with the forward pressure adjusting relief valve 15.
0 is provided, and when the rotation is stopped and only the forward movement is performed, the pilot switching valve 23 returns to the neutral position and the connecting pipe C
At the same time that the low pressure switching pilot switching valve 21 is returned to neutral and the pressure in the forward conduit FF becomes the set pressure of the low pressure relief valve 20, the thrust can be automatically prevented from becoming excessive. The same applies to the case of reverse forward movement. Here, the set pressure of the low-pressure relief valve 20 is set to 50 kgf / cm ²
It is set to a degree.

When the rod is replenished and the screw cutting step in the recovery operation is performed at a low speed, the rotating mechanism 2 is reversed, so that the pressure oil is supplied to the reverse rotation conduit RR. Forward rotation line R
Since F has a low pressure, the pilot switching valve 23 does not switch. Therefore, the pressure oil supplied to the reverse line FR is supplied to the feed mechanism 4 through the reverse flow rate adjusting valve 12 and the check valve 24, and the return oil from the feed mechanism 4 is supplied to the check valves 13 and 7. By-passing the forward flow rate adjusting valve 10 and the pressure reducing valve 6, the gas flows out from the forward conduit FF. At this time, the pressure of the pressure oil supplied to the feed mechanism 4 becomes the set pressure of the backward pressure adjusting relief valve 8, and the flow rate becomes the set flow rate of the backward flow adjusting valve 12.
The drilling machine 3 is given a predetermined low speed backward speed by the feed mechanism 4.

At the time of reversing in the normal direction, the pilot switching valve 23 is switched, but the pressure oil supplied to the retreating conduit FR is supplied to the feed mechanism 4 through the check valve 24, so that it can be retreated. When only normal rotation is performed, the pilot switching solenoid valve 27 is switched to shut off the connection conduit C in order to prevent pressure oil from flowing from the normal rotation conduit RF into the reverse conduit FR.

During rapid feed in the non-drilled state, the rapid feed switching solenoid valve 9, the forward pressure switching solenoid valve 14, and the pilot switching solenoid valve 27 are switched. At the time of fast forward advance, the pressure oil supplied to the forward conduit FF is supplied to the feed mechanism 4 from the pressure reducing valve 6 through the fast forward switching electromagnetic valve 9. At this time, if the pilot switching valve 23 is switched, the return oil from the feed mechanism 4 is throttled by the orifice 25 of the connecting pipe C and cannot be fast-forwarded. Therefore, the fast-forward switching solenoid valve 9 and forward pressure switching valve Simultaneously with the switching of the solenoid valve 14, the pilot switching solenoid valve 27 is also switched.

Since the pilot switching valve 23 is not switched, the return oil from the feed mechanism 4 is returned to the solenoid valve 9 for quick-forward switching.
And flows out from the backward conduit FR. At this time, the pressure of the pressure oil supplied to the feed mechanism 4 becomes the maximum set pressure of the main body of the pressure reducing valve 6 and does not pass through the forward flow rate adjusting valve 10, so the flow rate becomes the maximum and the rock drilling machine 3 does not. The feed mechanism 4 gives a large thrust and a high forward speed. Here, the maximum set pressure of the pressure reducing valve 6 is set to 150 kgf / cm ²
I am trying.

At the time of fast-forward reverse, the pressure oil supplied to the reverse conduit FR is supplied to the feed mechanism 4 through the fast-forward switching electromagnetic valve 9. Return oil from the feed mechanism 4 passes through the fast-forward switching electromagnetic valve 9, bypasses the pressure reducing valve 6 with the check valve 7, and flows out from the forward conduit FF. At this time, the pressure of the pressure oil supplied to the feed mechanism becomes the set pressure of the backward pressure adjusting relief valve 8 and does not pass through the backward flow rate adjusting valve 12, so the flow rate becomes maximum, and the rock drill 3 is fed to the feeding mechanism. 4 gives a fast reverse speed.

Since the pilot switching solenoid valve 27 is switched at the time of fast-forwarding, the operation of the feeding mechanism 4 is the same regardless of whether the rotating mechanism is forward, reverse, or stopped.

[0047]

As described above, according to the drilling control device of the present invention, in the hydraulic crawler drill, it is possible to control so as to reduce the thrust of the feed mechanism when the rotational resistance increases during drilling. Therefore, the rod replenishment, the low-speed retreat speed in the screw cutting process in the recovery operation, and the fast-forward speed in the non-drilled state can be switched as needed and can be appropriately controlled.

Furthermore, a low pressure relief valve is provided in parallel with the forward pressure adjusting relief valve, the low pressure relief valve is connected to the tank via the low pressure switching pilot switching valve, and the pilot port of the low pressure switching pilot switching valve is connected to the pilot pipe. When the rotation is stopped and only forward movement is performed by connecting to the line, the pilot switching valve cuts off the communication of the connecting pipeline, and at the same time the pilot switching valve for low pressure switching returns to neutral.
Since the pressure in the forward line becomes the set pressure of the low pressure relief valve,
It can prevent the thrust from becoming excessive.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of a drilling control device for a hydraulic crawler drill showing an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of a conventional drilling control device for a hydraulic crawler drill.

[Explanation of symbols]

1 striking mechanism 2 rotation mechanism 3 drilling machine 4 Feeding mechanism 5 feed motor 6 Pressure reducing valve 7 Check valve 8 Relief valve for reverse pressure adjustment 9 Rapid feed switching solenoid valve 10 Forward flow control valve 11 Check valve 12 Reverse flow control valve 13 Check valve 14 Solenoid valve for forward pressure switching 20 Low pressure relief valve 21 Pilot switching valve for low pressure switching 22 tanks 23 Pilot switching valve 24 Check valve 25 orifice 26 Check valve 27 Solenoid valve for pilot switching 28 Orifice FF forward pipeline FR reverse line RF forward line RR reversing pipe P pilot line C connection line

Claims (2)

(57) [Claims] 1. A rock drill having a hydraulically driven striking mechanism and a rotating mechanism, and a feed mechanism for the rock drill, and a rapid-feed switching solenoid valve in the middle of a forward pipe line and a backward pipe line of the feed mechanism. A pressure reducing valve and a check valve are provided in parallel on the upstream side of the fast-forward switching solenoid valve in the forward pipeline, and a forward flow rate adjusting valve and a check valve are provided in parallel with the fast-forward switching solenoid valve, and the reverse valve is installed. A relief valve for backward pressure adjustment is provided upstream of the solenoid valve for rapid feed switching in the pipeline, a reverse flow rate adjustment valve and a check valve are provided in parallel with the solenoid valve for rapid feed switching, and the working pressure control port of the pressure reducing valve is provided. In a hydraulic crawler drill with a forward pressure adjusting relief valve connected via a forward pressure switching solenoid valve, a pilot switching valve and a check valve are installed between the backward flow rate adjusting valve in the backward pipeline and the hydraulic actuator of the feed mechanism. Valve in parallel with the pilot switching valve A pilot line connected to the pilot port of the pilot switching valve by providing a connecting line that connects the reverse line and the forward rotation line of the rotating mechanism, and providing an orifice and a check valve in parallel in the middle of the connecting line. The pipeline control device for hydraulic crawler drills is characterized in that the pipeline is connected to a forward rotation pipeline via a pilot switching solenoid valve and is also connected to a tank via an orifice. 2. A low pressure relief valve is provided in parallel with a forward pressure adjusting relief valve, the low pressure relief valve is connected to a tank via a low pressure switching pilot switching valve, and the pilot port of the low pressure switching pilot switching valve is a pilot pipe. The drilling control device for the hydraulic crawler drill according to claim 1, wherein the drilling control device is connected to a passage.