JP3778313B2 - Mast floatation device for rock bolt driving machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lock bolt driving machine used to drive a lock bolt on a slope such as a road side wall, etc., so that a mast that supports a voltaic head can be floated at the time of operation, and a lock bolt driving device that prevents a cart from being overturned is provided. The present invention relates to a mast floating device for construction equipment.
[0002]
[Prior art]
When a slope such as a road side wall is formed, in order to prevent the slope from collapsing, a lock bolt is placed and reinforced.
[0003]
In order to drive a rock bolt on the slope, a work scaffold must be provided along the slope, and operations such as drilling, injection of cement milk, and insertion of the lock bolt must be performed.
However, the construction of the work scaffold is cumbersome and time-consuming and costly, and the worker performs high-altitude work on the work scaffold.
[0004]
Therefore, in recent years, in order to improve the efficiency and safety of the rock bolt placing work, a tiltable mast has been provided on a self-propelled carriage, and a rocker bolt for mounting the lock bolt is mounted on this mast. Construction equipment has been developed.
[0005]
In this lock bolt driving machine, the mast is tilted so as to be parallel to the slope, and the voltaic head is moved up and down along the mast to drive the lock bolt at a predetermined position on the slope.
[0006]
For this reason, a long mast is required to drive a rock bolt on a high slope, but if the long mast is supported in an inclined state, the dolly will be unstable. In this state, there is a high risk that the carriage will fall. Therefore, a large trolley is required to secure the stability of the rock bolt driving machine only with the trolley.
[0007]
Therefore, in order to reduce the size of the carriage, the mast is provided with a mast support extending to the slope side so that the inclined mast is supported from the slope.
[0008]
[Problems to be solved by the invention]
However, even if the mast support is extended to support the mast, if the portion of the slope supporting the mast support collapses, the inclined mast cannot be supported, and the carriage may fall with the mast.
[0009]
The present invention solves such a problem in the lock bolt driving machine, and can prevent the cart from falling even if the mast support cannot support the mast. An object of the present invention is to provide a mast floating device.
[0010]
[Means for Solving the Problems]
A mast floating device for a rock bolt driving machine according to the present invention includes a movable carriage, a mast that is pivotally supported on the carriage and tilted by a mast swing cylinder, and a lock bolt that is mounted on the mast so as to be movable up and down. In a lock bolt driving machine equipped with a volta head and a mast support fixed to the mast and extended to the slope side by a mast support cylinder, and supporting the inclined mast from the slope, the extension pipe of the mast support cylinder There is a pressure switch for detecting the mast support state by the mast support, and the mast swing cylinder tilting conduit is connected to the mast swing cylinder via a normally closed electromagnetic switching valve that is switched to the open side by the pressure switch in the mast support state by the mast support. The said subject is solved by connecting with a return pipeline.
[0011]
When placing a lock bolt on the slope, drive the carriage to the vicinity of the slope, tilt the mast so that it is parallel to the slope while the volta head is within the stable range below, and use the mast support. A mast that extends to the surface side and is inclined is supported from the slope. Then, the voltaic head is raised along the mast, and a lock bolt is driven at a predetermined position on the slope.
[0012]
In the above operation, when the mast support is extended to support the inclined mast, the pressure on the side of the extension pipe of the mast support cylinder increases. Since the pressure switch detects this pressure increase and switches the electromagnetic switching valve to the open side, the tilting pipe line and the return pipe line of the mast swing cylinder are communicated to bring the mast into a floating state.
[0013]
If the part supporting the mast support on the slope collapses during work, the mast support can not support the inclined mast, but at this time, the mast is in the floating state, so only the mast tilts, There is no risk of the cart falling over with the mast and it is safe.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view of a lock bolt driving machine equipped with a mast floatation device according to an embodiment of the present invention, FIG. 2 is a side view of the lock bolt driving machine, and FIG. FIG. 4 is a front view of the lock bolt driving machine showing a state in which the inclined mast is supported from the slope by the mast support, and FIG. 5 is a hydraulic pressure of the mast floating device. It is a circuit diagram.
[0015]
The rock bolt driving machine 1 includes a carriage 2, a mast 3 provided on the carriage 2, a bolt head 4 for placing a lock bolt mounted on the mast, and a mast support 5 provided on the mast 3. ing.
[0016]
The carriage 2 is provided with a horizontally revolving swivel body 7 on a travelable crawler 6, and a mount body 8 is fixed to the front portion of the revolving body 7. A tilt body 9 is supported on the mount body 8 by a tilt shaft 10. A tilt cylinder 11 is provided between the mount body 8 and the tilt body 9, and the tilt body 9 is tilted back and forth by the expansion and contraction of the tilt cylinder 11.
[0017]
The lower end of the mast 3 is supported on the front end of the tilt body 9 by a swing shaft 12, and a pair of left and right mast swing cylinders 13 (13 L, 13 R) are provided between the tilt body 9 and the mast 3. As shown in FIG. 4, when the left mast swing cylinder 13L extends and the right mast swing cylinder 13R shortens, the mast 3 tilts to the right slope 14 (clockwise in the figure), and the right mast When the swing cylinder 13R extends and the left mast swing cylinder 13L contracts, the mast 3 returns to the upright state.
[0018]
The mast 3 is provided with two mast supports 5 facing the right side. The mast support 5 is extended toward the slope 14 side by the extension of the built-in mast support cylinder 20, and the inclined mast 3 can be supported from the slope 14. A lower support 22 that supports the mast 3 from the ground 21 is provided on the right side of the lower end of the mast 3.
[0019]
The voltaic head 4 is a rock bolt driving device provided with a rock drill 18 for drilling a bolt hole in a slope 14 and a bolt insertion mechanism 19 for inserting a lock bolt into the bolt hole. A guide shell 17 that guides the movement of the bolt insertion mechanism 19 in the direction of the slope 14 is supported by the carriage 16. The carriage 16 is movable up and down along the mast 3 by a chain 15 stretched on the mast 3.
[0020]
As shown in FIG. 5, a tilt conduit 23 is connected to the head side oil chamber of the left mast swing cylinder 13L and the rod side oil chamber of the right mast swing cylinder 13R, and the rod side of the left mast swing cylinder 13L. A return conduit 24 is connected to the oil chamber and the head-side oil chamber of the right mast swing cylinder 13R. The tilting conduit 23 and the return conduit 24 are connected to the cylinder port of the mast swing control valve 25. The mast swing control valve 25 is a center bypass type hydraulic pilot switching valve at three positions. By switching the mast swing control valve 25 by operating a pilot valve (not shown), the tilting line 23 and the return line 24 are hydraulically operated. The discharge line 27 of the pump 26 communicates with a return line 29 to the tank 28. In addition, the tilting conduit 23 and the return conduit 24 are connected to the tank 28 via check valves 30 and 31 that allow inflow of hydraulic oil and prevent outflow.
[0021]
Further, the tilting conduit 23 and the return conduit 24 are connected via an electromagnetic switching valve 32. The electromagnetic switching valve 32 is normally closed. When the solenoid is excited, the electromagnetic switching valve 32 is opened to connect the tilting conduit 23 and the return conduit 24.
[0022]
An extension pipe line 33 is connected to the head side oil chamber of the mast support cylinder 20, and a reduction pipe line 34 is connected to the rod side oil chamber of the mast support cylinder 20. The extension line 33 and the reduction line 34 are connected to the cylinder port of the mast support control valve 35. The mast support control valve 35 is a center bypass type hydraulic pilot switching valve at three positions. By switching the mast support control valve 35 by operating a pilot valve (not shown), the expansion line 33 and the reduction line 34 are hydraulically connected. The discharge line 27 of the pump 26 communicates with the return line 39 to the tank 28.
[0023]
Further, a pressure switch 40 is provided in the extension pipe 33. The pressure switch 40 is turned on when the mast support 5 is extended to support the mast 3 and the pressure in the oil chamber on the head side of the mast support cylinder 20 is increased, and the solenoid of the electromagnetic switching valve 32 is excited to activate the electromagnetic switching valve. 32 is switched to the open side.
[0024]
When placing a lock bolt on the slope 14, the carriage 2 travels to the vicinity of the slope 14, and the tilt cylinder 11 is extended to bring the mast 3 upright. Next, as shown in FIG. 3, with the voltaic head 4 in the stable range below the predetermined height H, the left mast swing cylinder 13L is extended, the right mast swing cylinder 13R is reduced, and the mast 3 is moved to the right. The mast 3 is made parallel to the slope 14 as shown in FIG.
[0025]
Then, the mast support cylinder 20 is extended, the mast support 5 is extended to the slope 14 side, and the inclined mast 3 is supported from the slope 14, and the lower support 22 is projected to support the mast 3 from the ground 21. .
[0026]
Thereafter, the voltaic head 4 is raised along the mast 3, a bolt hole is drilled by a rock drill 18 at a predetermined position on the slope 14, cement milk is injected, and the bolt insertion mechanism 19 is moved to the position of the bolt hole. Move and insert the lock bolt. When the driving of the one lock bolt is completed, the volta head 4 is moved along the mast 3 to the next driving position, and the locking bolt is driven again at this position.
[0027]
When a predetermined number of lock bolts are driven along the mast 3, the volta head 4 is lowered to the lower stable range, and then the mast support cylinder 20 is contracted and the mast support 5 is contracted. The swing cylinder 13L is reduced, the right mast swing cylinder 13R is extended to return the mast 3 to the upright state, and the carriage 2 is moved to the next work position.
[0028]
In the above operation, when the mast 3 is tilted to the slope 14 side, the mast swing control valve 25 is switched to connect the discharge pipe 27 and the tilt pipe 23 of the hydraulic pump 26. At this time, since the electromagnetic switching valve 32 is closed, the hydraulic oil flows from the tilt pipe 23 into the head side oil chamber of the left mast swing cylinder 13L and the rod side oil chamber of the right mast swing cylinder 13R. Thus, the left mast swing cylinder 13L expands and the right mast swing cylinder 13R contracts. When the mast 3 is parallel to the slope 14, the mast swing control valve 25 is returned to the neutral position.
[0029]
When the mast support 5 is extended, the mast support control valve 35 is switched so that the discharge pipe 27 and the extension pipe 33 of the hydraulic pump 26 communicate with each other. Then, the hydraulic oil flows into the head side oil chamber of the mast support cylinder 20 from the extension pipe 33, and the mast support cylinder 20 extends. When the mast support cylinder 20 extends and the mast support 5 extends toward the slope 14 side, and the inclined mast 3 is supported from the slope 14, the pressure in the head side oil chamber of the mast support cylinder 20 increases. Then, the pressure switch 40 is turned ON and the electromagnetic switching valve 32 is switched to the open side, so that the tilting pipe line 23 and the return pipe line 24 are communicated with each other, and the mast 3 enters a floating state in which it can be tilted by an external force. Since the mast support control valve 35 is returned to the neutral position after the mast support 5 is extended, the pressure switch 40 is held in the ON state.
[0030]
If the part supporting the mast support 5 of the slope 14 collapses during the work, the mast support 5 cannot support the inclined mast 3. The mast 3 tilts due to gravity. At this time, the mast 3 is in a floating state, and only the mast 3 tilts about the swing shaft 12, so there is no risk that the carriage 2 will fall with the mast 3. is there.
[0031]
【The invention's effect】
As described above, the mast floatation device for the rock bolt driving machine according to the present invention can prevent the cart from falling over even if the mast support cannot support the mast. The safety of the work by the construction machine can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a rock bolt driving machine provided with a mast floating device according to an embodiment of the present invention.
FIG. 2 is a side view of a lock bolt driving machine.
FIG. 3 is a front view of the lock bolt driving machine showing a state in which the voltaic head is in a stable range below.
FIG. 4 is a front view of a rock bolt driving machine showing a state where an inclined mast is supported from a slope by a mast support.
FIG. 5 is a hydraulic circuit diagram of the mast floating device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rock bolt driving machine 2 Carriage 3 Mast 4 Volta head 5 Mast support 6 Crawler 7 Rotating body 12 Swing shaft 13 Mast swing cylinder 14 Slope 15 Chain 16 Carriage 17 Guide shell 18 Drilling machine 19 Bolt insertion mechanism 20 Mast support cylinder 23 Tilt line 24 Return line 25 Mast swing control valve 32 Electromagnetic switching valve 33 Extension line 34 Reduction line 35 Mast support control valve 40 Pressure switch

Claims (1)

A trolley that can run freely, a mast that is pivotally supported on the trolley and tilted by a mast swing cylinder, a bolt head that is mounted on the mast so that it can be raised and lowered, and a mast support cylinder that is fixed to the mast In a rock bolt driving machine equipped with a mast support that is extended to and supports an inclined mast from a slope,
A pressure switch for detecting the mast support state of the mast support is provided in the extension line of the mast support cylinder, and through a normally closed electromagnetic switching valve that is switched to the open side by the pressure switch in the mast support state of the mast support, A mast floating device for a rock bolt driving machine, characterized in that a tilting conduit and a return conduit of a mast swing cylinder are connected.

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