JPH0144617Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an engine control device for a self-propelled rock drill equipped with a traveling vehicle.

(Prior Art) Conventionally, in a self-propelled rock drill equipped with a traveling vehicle, it is known that the traveling engine of the traveling vehicle operates a fluid drive source that drives a drifter.

As such a rock drilling machine, for example,
As described in Publication No. 43594, the control lever in the cockpit of the rock drill and the governor control lever of the engine are connected with a wire, and a control cylinder is provided between the wire and the governor control lever, and the rock drill By connecting the oil chamber of the control cylinder and the operating circuit of the striking mechanism with a conduit so as to move the governor control lever to the engine full speed rotation position when the striking mechanism is activated, the rotation of the engine is controlled when drilling a hole. Some systems aim to improve work efficiency by increasing the number of engines, and reduce noise by lowering the engine speed after work is completed.

By the way, generally, during drilling work, air is blown through the air supply hole provided in the drifter to discharge the crushed material from the hole to the outside, which is called "drill discharge", but it is difficult to completely discharge the crushed material. Therefore, after completing the drilling work,
It is customary to clean the crushed material in the hole by moving the drifter back and forth inside the hole while blowing air, and it is desired to improve the engine output to improve work efficiency during this cleaning work as well.

(Problem to be solved by the invention) However, the technology described in the above-mentioned Japanese Utility Model Application Publication No. 59-43594 only aims to improve the output of the engine that increases the engine speed during drilling work, but does not take into account cleaning work. It has not been.

The purpose of this invention is to improve the work efficiency of the above-mentioned rock drilling machine by increasing the engine rotation not only during drilling but also during hole cleaning after drilling. It is something to do.

(Means for Solving the Problems) The present invention is based on a rock drill in which an engine operates a hydraulic pump for a drifter, which is a fluid drive source for driving a drifter, and an air compressor operated by the engine. , connect the air blow circuit that supplies air to the drifter to discharge the powder,
Downstream of the on-off valve installed in the air blow circuit,
A lever control air cylinder associated with the throttle control lever of the fuel injection pump is connected via a lever operation switching valve, and the drifter is driven and milled chips are discharged by opening the on-off valve provided in the air blow circuit. The engine is characterized in that, in conjunction with the operation, the lever control air cylinder is driven to control the engine to a high speed side.

(Function) During drilling work, the hole is drilled while discharging the chips, so the on-off valve provided in the air blow circuit is opened, and the air cylinder for lever control is driven in conjunction with the drifter drive and the chip discharge operation. , the throttle control lever is controlled to the high rotation side, and the engine rotates at high speed.

When cleaning the hole after drilling, air is supplied to the air blow circuit to discharge the chips, and the engine runs at high speed, just like during the drilling, and the drifter cleans the inside of the hole while blowing air. Cleaning work, which involves repeated reciprocating movements and discharge of chips, can also be carried out efficiently.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In the drawing showing the hydraulic circuit of the engine control device of a self-propelled rock drilling machine equipped with a running vehicle, 1 is a diesel engine, and a series of hydraulic pumps 3, 4, 5, 6 and air compressor 7 to operate them.

The hydraulic pumps 3 and 4 are connected to left and right travel circuits 8 and 9, respectively, and one of the hydraulic pumps 4 (hydraulic pump for drifter) is also connected to the drifter striking circuit 11 of the drifter striking mechanism 10, and the drifter striking circuit 11 is connected to the drifter striking circuit 11 of the drifter striking mechanism 10. A relief passage 13 is connected in the middle of the circuit 11 and is provided with a control valve 12 that is closed during drilling operations. hydraulic pump 5
is the drifter rotation motor 1 via the valve 14.
5, and the hydraulic pump 6 is connected to a valve unit 16.
are connected to the boom hydraulic cylinder 14 and the cell hydraulic cylinder 18, respectively. The valve unit 16 includes a motor 19 for a dust collector that collects dust generated during drilling work.
and a first switching valve 2 having a first position 20a for rotating the motor 19 and a second position 20b for stopping the motor 19.
A dust collector circuit 21 with 0 and 0 is connected.

On the other hand, the air compressor 7 has an on-off valve 22
The air blower circuit 23 is connected to the drifter striking mechanism 10 having a drifter impact mechanism 10, and is linked to an air blow circuit 23 that supplies air for discharging the powder from the drifter. Further, downstream of the on-off valve 22 provided with the air blow circuit 23, a lever control air cylinder 25 associated with the throttle control lever 29 of the diesel engine 1 is linked via a second switching valve 24. . The second switching valve 24 is the first switching valve that moves the air cylinder 25 to extend.
It has a position 24a and a second position 24b where it is contracted.

The air blow circuit 23 includes a pressure switch 26.
are linked. This pressure switch 26 includes a movable terminal 26a, a first contact 26b (a contact) that closes when the air pressure of the air blow circuit 23 is high,
A second contact 26c (b contact) that closes when the air pressure of the air blow circuit 23 is high;
6b is connected to the solenoid 24c of the second switching valve 24, and the second contact 26c is connected to the solenoid 20 of the first switching valve 20.
c and are electrically linked to each other. As a result, the air blow circuit 2 is configured to discharge chips during drilling work and subsequent cleaning work.
Since the air pressure at No. 3 is increasing, the first contact 26a of the pressure switch 26 is closed, and the solenoids 20c and 24c of the first and second switching valves 20 and 24 are energized and set to the first positions 20a and 24a. In other cases, the second contact 26b of the pressure switch 24 is closed, so the solenoids 20c, 24c of the first and second switching valves 20, 24 are demagnetized and set to the second positions 20b, 24b. .

Piston rod 25a of the air cylinder 25
A first engaging member 27 having a long hole 27a is fixedly installed in the first engaging member 27, and a throttle control lever 29 in the fuel injection pump 28 of the diesel engine 1 is installed upright in the long hole 27a of the first engaging member 27. The first engagement pin 30 is slidably engaged. Further, a second engagement pin 31, which is provided upright on the throttle control lever 29 on the distal end side of the first engagement pin 30, is slidably engaged with the elongated hole 32a of the second engagement member 32. , the second engaging member 32 is linked to a control lever (not shown) in the cockpit via a push-pull cable 33.

As a result, the first or second engaging member 27,
32 is pressed by the air cylinder 25 or the push-pull cable 33, the first
Alternatively, the throttle control lever 29 is rotated clockwise by engagement with the second engagement pins 30 and 31, and the fuel injection pump 2 of the diesel engine 1 is rotated clockwise.
8 will be controlled to the high rotation side.

With the above configuration, during drilling work (drifter striking work), the drilling is performed while discharging the chips, so the control valve 12 is closed and oil is supplied to the drifter striking circuit 11, and the on-off valve 22 is opened and air blow circuit 2
3 is supplied with air. As a result, the air pressure in the air blow circuit 23 increases and becomes high pressure, which is detected by the pressure switch 26 and the first contact 26b
is closed, and the second switching valve 24 is closed solenoid 24c
is excited and becomes the first position 24a.

Therefore, the air cylinder 25 performs an expansion operation,
The engagement between the first engagement member 27 and the engagement pin 30 causes the throttle control lever 29 of the fuel injection pump 28 to rotate toward the high rotation side, that is, in the clockwise direction, and as a result, the diesel engine 1
becomes high rotation. Correspondingly, the rotation of the hydraulic pump 4 and the air compressor 7 increases, the amount of oil supplied to the drifter striking circuit 11 and the amount of air supplied to the air blow circuit 23 increase, and the work efficiency of the drilling operation is improved.

Even during the hole cleaning operation after drilling, air is supplied to the air blow circuit 23 to discharge the chips, and the air pressure in the air blow circuit 23 is high, so the pressure switch 26 closes the first contact 26a. Closed, the diesel engine 1 is in a high rotation state as in the drilling operation described above. By that,
It is also possible to efficiently perform cleaning work by repeatedly moving the drifter back and forth within the hole while blowing air to discharge the powder.

Note that during the drilling and cleaning operations, the pressure switch 26 closes the first contact 26b and opens the second contact 26c, so the first switching valve 20
is in the first position 20a when the solenoid 20c is demagnetized.
As a result, the dust collector motor 19 rotates, and the crushed material produced by the drilling is collected.

On the other hand, when the powder is not discharged, the air pressure in the air blow circuit 23 is low, so the pressure switch 2
No. 6 second contact 26c is opened. Therefore,
The second switching valve 24 is in the first position 24b, the air cylinder 25 is contracted, the throttle control lever 29 of the fuel injection pump 28 is rotated to the low rotation side, that is, counterclockwise, and the diesel engine 1
Since the rotation speed is low, noise can be reduced.

(Effects of the invention) Since the invention is configured as described above, during drilling work, the blowing and feeding of the drifter is performed powerfully and efficiently using pressurized oil, while the chips in the hole are discharged using high-pressure air. Therefore, it can be carried out reliably and efficiently. Moreover, after drilling, the operating force of the drifter that has stopped striking can be further increased, and the crushed material in the hole can be powerfully and smoothly cleaned while rapidly feeding the inside of the hole.

[Brief explanation of the drawing]

The drawing is a hydraulic circuit diagram of an engine control device for a rock drill, which is an embodiment of the present invention. 1... Diesel engine, 3, 4, 5, 6...
...Hydraulic pump, 7...Air compressor, 23...
...Air blow circuit, 24...Second switching valve, 25...
...Air cylinder, 26...Pressure switch, 28...
...Fuel injection pump, 29...Throttle control lever.

Claims (1)

[Scope of utility model registration request] In a rock drill in which a hydraulic pump for a drifter, which is a fluid drive source for driving a drifter, is operated by an engine, an air blow circuit that supplies air for discharging chips to the drifter is connected to an air compressor operated by the engine. A lever control air cylinder associated with the throttle control lever of the fuel injection pump is connected downstream of the on-off valve provided in the air blow circuit via a lever operation switching valve, and is provided in the air blow circuit. An engine for a rock drilling machine, characterized in that by opening an on-off valve, the engine is controlled to a high speed side by driving a lever control air cylinder in conjunction with the drifter drive and chip discharge operation. Control device.