JP4818758B2 - Mast rattle prevention device - Google Patents

Description

  The present invention relates to a drilling machine for drilling a rock mass or the like, which prevents the rattling from occurring between a mast on which the drilling machine is mounted and a guide mounting that supports the mast so that the mast can be moved forward and backward. Relates to the device.

Generally, a drilling machine for drilling a bedrock or the like includes a self-propelled cart, a mast mechanism provided at the tip of the boom of the cart, and a drilling machine that moves forward and backward on the mast of the mast mechanism (Patent Document). 1).
An example of the drilling machine concerning FIG. 7 is shown. The drilling machine 1 has a self-propelled cart 3, and a boom 5 is pivotally supported on the cart 3 so that the boom 5 can be rotated and raised, and a mast mechanism 7 is attached to the tip of the boom 5. The mast mechanism 7 includes a guide mounting 13, a mast 9, and a guide slide cylinder 17. A guide mounting 13 is pivotally supported at the tip of the boom 5. The guide slide cylinder 17 has one end attached to the mast 9 side and the other end attached to the guide mounting 13 side. When the guide slide cylinder 17 expands and contracts, the mast 9 is guided by the guide plate 19 of the guide mounting 13 and is configured to move forward and backward while sliding on the guide mounting 13.

The mast 9 has a feeding mechanism, and the rock drill 14 is configured to advance and retreat on the mast 9 by this feeding mechanism. A hood pad 57 is provided at the front end of the mast 9.
When drilling rock with the drilling machine 1, first, the inclination angle of the mast mechanism 7 is determined. When the inclination angle of the mast mechanism 7 is determined, the guide slide cylinder 17 is reduced to advance the mast 9, the hood pad 57 is pressed against the rock in the drilling position, and the mast 9 is fixed to the drilling position. When the mast 9 is fixed at the drilling position, the rock drill 14 is advanced on the mast 9 by the feed mechanism and drilled at the drilling position.

  Since the mast 9 advances and retreats on the guide mounting 13 after the inclination angle of the mast mechanism 7 is determined, it is easy to press the front end of the mast 9 against the drilling position even when the drilling position is on an inclined ground. It is. However, when the drilling position is in a soft ground, the mast 9 cannot be firmly fixed to the drilling position even if the hood pad 57 is pressed against the soft ground.

  Therefore, a guide mounting 13 shown in FIG. 8 is used. A stabilizer 15 is formed at the front end of the guide mounting 13. The stabilizer 15 has a curved and elongated claw shape, and the tip of the stabilizer 15 faces the carriage 3 side. A guide clamp 25 is installed on the frame 4 of the carriage 3, and the stabilizer 15 is positioned between a pair of clamp works that the guide clamp 25 has. When the inclination angle of the guide mounting 13 changes, the stabilizer 15 moves between the clamp works, and when the guide clamp 25 holds and fixes the stabilizer 15 between the clamp works, the inclination angle of the guide mounting 13 is fixed. It has become.

  The inclination angle of the guide mounting 13 is the inclination angle of the mast mechanism 7. When the inclination angle of the mast mechanism 7 changes, the stabilizer 15 moves between the clamp works of the guide clamp 25. When the inclination angle of the mast mechanism 7 reaches a predetermined angle, the stabilizer 15 is held and fixed by the guide clamp 25, and the inclination angle of the mast mechanism 7 is fixed. When the inclination angle of the mast mechanism 7 is fixed, the guide slide cylinder 17 is reduced, the mast 9 is advanced, and the front end of the mast 9 is moved to the drilling position. Then, the drilling machine 14 drills at the drilling position.

Even if there is a drilling position in soft ground, the mast 9 can be firmly fixed to the drilling position by fixing the inclination angle of the mast mechanism 7 with the stabilizer 15 and the guide clamp 25 and then moving the mast 9 forward.
JP-A-8-326463

In the mast mechanism 7 of the punching machine 1 described above, a gap is required between the mast 9 and the guide mounting 13 in order for the mast 9 to slide on the guide mounting 13 and move forward and backward. However, rattling occurs between the mast 9 and the guide mounting 13 due to this gap. In particular, while the drilling machine 14 is drilled, vibration is transmitted from the drilling machine 14 to the mast mechanism 7, and a large backlash occurs between the mast 9 and the guide mounting 13. Such rattling causes damage to the mast 9 and the guide mounting 13, and also hinders the stability of the mast 9.
The present invention solves the above-mentioned problems, and its object is that rattling occurs between the mast carrying the rock drill and the guide mounting that supports the mast so that the mast can be moved forward and backward. It is an object of the present invention to provide an apparatus for preventing mast rattling that can prevent the occurrence of the problem.

The present invention adopts the following configuration in order to solve the problem. The mast rattle prevention device according to the first aspect of the present invention includes a mast clamp that fixes a mast that supports the rock drill so as to be capable of moving forward and backward, and a guide mounting that supports the mast so as to be capable of moving forward and backward.
After the mast is moved forward and backward on the guide mounting and the front end of the mast 9 is moved to the drilling position, the mast and the guide mounting are fixed by the mast clamp. When the mast and the guide mounting are fixed, even if vibration is transmitted during drilling, there is no backlash between the mast and the guide mounting. When the mast is moved forward and backward on the guide mounting, the mast may be operated to release the mast from being fixed to the guide mounting.

A mast rattle prevention device according to a second aspect of the present invention is the mast rattle prevention device according to claim 1, wherein the guide clamp for fixing the inclination angle of the guide mounting, and the hydraulic circuit for simultaneously controlling the mast clamp and the guide clamp. And having.
Regardless of whether or not the drilling position is a soft ground, the inclination angle of the guide mounting is fixed by the guide clamp, so that it is easy to fix the inclination angle of the guide mounting. If the inclination angle of the guide mounting is fixed, the inclination angle of the mast is also fixed, so that the mast can be advanced to firmly fix the mast at the drilling position.
Since the hydraulic circuit controls the mast clamp and the guide clamp at the same time and both hydraulic clamps can be operated simultaneously, the working efficiency is increased.

  The mast rattling prevention device according to the present invention can prevent rattling from occurring between the mast on which the rock drill is mounted and the guide mounting that supports the mast so that the mast can move forward and backward.

The best mode for carrying out the present invention will be described with reference to FIGS.
A drilling machine 1 shown in FIG. 1 has a self-propelled cart 3, and a boom 5 is pivotally supported on the cart 3 so as to be able to rotate and rise, and a mast mechanism 7 is attached to the tip of the boom 5. . As shown in FIG. 2, the mast mechanism 7 includes a guide mounting 13, a mast 9, and a guide slide cylinder 17. A guide mounting 13 is pivotally supported at the tip of the boom 5. The guide slide cylinder 17 has one end attached to the mast 9 side and the other end attached to the guide mounting 13 side. When the guide slide cylinder 17 expands and contracts, the mast 9 is guided by the guide plate 19 of the guide mounting 13 and moves forward and backward while sliding on the guide mounting 13. Further, the mast 9 has a feed mechanism, and the rock drill 14 moves forward and backward on the mast 9 by this feed mechanism.
The guide mounting 13 has mast clamps 21a and 21b. The mast clamps 21a and 21b constitute part of a mast rattling prevention device. A mast clamp 21 a is arranged at the rear part of the guide mounting 13, and a mast clamp 21 b is arranged at the front part of the guide mounting 13.

  As shown in FIGS. 3 (i) and 3 (ii), the mast clamp 21 a has a hydraulic cylinder 29 and a pair of clamp arms 23. The clamp arm 23 is actuated by a hydraulic cylinder 29. When the hydraulic cylinder 29 is extended, the tip of each clamp arm 23 presses the truss 11 of the mast 9 (see FIG. 3 (ii)). Similarly, the mast clamp 21 b has a hydraulic cylinder 29 and a pair of clamp arms 23 that are operated by the hydraulic cylinder 29. When the hydraulic cylinders 29 of the mast clamps 21a and 21b are extended, the tip of each clamp arm 23 presses the truss 11 of the mast 9 so that the mast 9 and the guide mounting 13 are fixed.

  As shown in FIGS. 1 and 2, a stabilizer 15 is formed at the front end of the guide mounting 13. The stabilizer 15 has a curved and elongated claw shape, and the tip of the stabilizer 15 faces the carriage 3 side. As shown in FIGS. 1 and 4, a guide clamp 25 is installed on the frame 4 of the carriage 3, and the guide clamp 25 constitutes a part of the mast rattling prevention device. The guide clamp 25 includes a hydraulic cylinder 30 and a pair of clamp works 27 that are opened and closed by the hydraulic cylinder 30. The stabilizer 15 is located between the clamp works 27. When the inclination angle of the guide mounting 13 changes, the stabilizer 15 moves between the clamp works 27. When the guide clamp 25 holds and fixes the stabilizer 15 between the clamp works 27, the inclination angle of the guide mounting 13 is fixed. It is the composition which becomes.

The hydraulic cylinders 29 of the mast clamps 21a and 21b and the hydraulic cylinder 30 of the guide clamp 25 are connected to a hydraulic circuit 35 shown in FIG. The hydraulic circuit 35 constitutes a part of a mast rattling prevention device.
The hydraulic circuit 35 includes an extension side oil passage 37, a reduction side oil passage 41, a switching valve 45, a double operation check valve 47, and an accumulator 51.

  One end of the extension side oil passage 37 is connected to the hydraulic oil pump 53 and the hydraulic oil tank 55 via a switching valve 45 and a double operated check valve 47. The other end of the extension side oil passage 37 is branched into three extension side branch oil passages 39, and each extension side branch oil passage 39 is connected to each extension side oil chamber 31 of the hydraulic cylinders 29, 30. Yes. Similarly, one end of the reduction side oil passage 41 is connected to the hydraulic oil pump 53 and the hydraulic oil tank 55 via the switching valve 45 and the double-operated check valve 47. The other end of the reduction side oil passage 41 branches into three reduction side branch oil passages 43, and each reduction side branch oil passage 43 is connected to each reduction side oil chamber 33 of the hydraulic cylinders 29, 30. Yes.

  The switching valve 45 has three positions: a neutral position, a fixed position, and a release position. When the switching valve 45 is in the neutral position, the extension side oil passage 37 and the reduction side oil passage 41 communicate with the hydraulic oil tank 55, and the hydraulic oil pump 53 is disconnected from the extension side oil passage 37 and the reduction side oil passage 41. Discharge of the hydraulic oil from the hydraulic oil pump 53 to the extension side oil passage 37 or the reduction side oil passage 41 is stopped, and the hydraulic oil discharged from the hydraulic oil pump 53 passes through a relief valve (not shown). 55 is configured to flow. When the switching valve 45 is in the fixed position, the extension side oil passage 37 communicates with the hydraulic oil pump 53 and the reduction side oil passage 41 communicates with the hydraulic oil tank 55. When the switching valve 45 is in the release position, the extension side oil passage 37 communicates with the hydraulic oil tank 55, and the reduction side oil passage 41 communicates with the hydraulic oil pump 53.

  The double operated check valve 47 has pilot check valves 49a and 49b. A pilot check valve 49 a is installed in the extension side oil passage 37, and a pilot check valve 49 b is installed in the reduction side oil passage 41. The directions of the pilot check valves 49a and 49b are directions in which hydraulic fluid flows from the switching valve 45 to the hydraulic cylinders 29 and 30. The pilot check valve 49a uses the pressure in the reduction side oil passage 41 between the pilot check valve 49b and the switching valve 45 as a pilot pressure, and the pilot check valve 49b reduces the pressure between the pilot check valve 49a and the switching valve 45. The pressure in the side oil passage 41 is a pilot pressure. When the hydraulic oil is discharged from the hydraulic oil pump 53 to the extension side oil passage 37 or the reduction side oil passage 41, the pilot check valves 49a and 49b are opened, and the extension side oil passage 37 and the reduction side oil passage 41 communicate with each other. The operation check valve 47 is opened. If the hydraulic oil is not discharged from the hydraulic oil pump 53 to the extension side oil passage 37 or the reduction side oil passage 41, the pilot check valves 49a and 49b are closed, the extension side oil passage 37 and the reduction side oil passage 41 are closed, and double The operation check valve 47 is closed.

  An accumulator 51 is installed in the extension side branch oil passage 39. When the hydraulic oil is discharged from the hydraulic oil pump 53 to the extension side oil passage 37 and the double operation check valve 47 is opened, the accumulator 51 is configured to suck the hydraulic oil from the extension side branch oil passage 39. Further, when the discharge of hydraulic oil from the hydraulic oil pump 53 to the extension side oil passage 37 is stopped and the double operation check valve 47 is closed, the high pressure hydraulic oil is discharged from the accumulator 51 to the extension side branch oil passage 39. It has become.

Next, the operation will be described.
First, the drilling machine 1 is moved to the vicinity of the drilling position by the carriage 3. Then, the switching valve 45 is switched to the release position, and hydraulic oil is discharged from the hydraulic oil pump 53 to the reduction-side oil passage 41. The double-operated check valve 47 opens, the extension side oil passage 37 and the reduction side oil passage 41 communicate with each other, the hydraulic oil is supplied to the reduction side oil chambers 33 of the hydraulic cylinders 29 and 30, and the hydraulic cylinders 29 and 30 are reduced. To do.

  When the hydraulic cylinder 29 is reduced, the tips of the clamp arms 23 of the mast clamps 21a and 21b are separated from the truss 11 of the mast 9, the mast 9 is released from being fixed to the guide mounting 13, and the mast 9 is on the guide mounting 13. Slide to move forward and backward. When the hydraulic cylinder 30 is reduced, the stabilizer 15 is released from being fixed by the guide clamp 25, and the inclination angle of the guide mounting 13 can be adjusted.

  Next, the switching valve 45 is switched to the neutral position, and the hydraulic oil discharged from the hydraulic oil pump 53 is caused to flow to the hydraulic oil tank 55. Discharge of the hydraulic oil from the hydraulic oil pump 53 to the reduction side oil passage 41 is stopped, the double operation check valve 47 is closed, and the extension side oil passage 37 and the reduction side oil passage 41 are closed. The hydraulic cylinders 29a, 29b, and 29c remain reduced. Then, the inclination angle of the guide mounting 13 is adjusted to a predetermined angle. The mast 9 on the guide mounting 13 together with the guide mounting 13 has the same inclination angle. When the inclination angle of the guide mounting 13 is adjusted, the guide slide cylinder 17 is expanded and contracted to advance the mast 9 on the guide mounting 13, and the tip of the mast 9 is adjusted to the drilling position.

  When the inclination angle of the guide mounting 13 is adjusted and the tip of the mast 9 is adjusted to the drilling position, the switching valve 45 is switched to the fixed position, and the hydraulic oil is discharged from the hydraulic oil pump 53 to the extension side oil passage 37. The double-operated check valve 47 is opened, the extension side oil passage 37 and the reduction side oil passage 41 are communicated, and hydraulic oil is supplied to the extension side oil chambers 31 of the hydraulic cylinders 29 and 30, and the hydraulic cylinders 29 and 30 are extended. To do. At the same time, the accumulator 51 sucks high-pressure hydraulic oil from the extension side branch oil passage 39.

When the hydraulic cylinder 29 extends, the tips of the clamp arms 23 of the mast clamps 21 a and 21 b press the truss 11 of the mast 9, and the mast 9 is fixed to the guide mounting 13. When the mast 9 is fixed to the guide mounting 13, there is no backlash between the mast 9 and the guide mounting 13.
When the hydraulic cylinder 30 is extended, the guide clamp 25 holds and fixes the stabilizer 15 between the clamp works 27, and the inclination angles of the guide mounting 13 and the mast 9 are fixed. Since the inclination angle is fixed by the guide clamp 25, the inclination angles of the guide mounting 13 and the mast 9 can be easily fixed regardless of whether the drilling position is an inclined ground or a soft ground.

  When the mast 9 and the guide mounting 13 are fixed by the mast clamps 21 a and 21 b and the inclination angle of the guide mounting 13 and the mast 9 is fixed by the guide clamp 25, the switching valve 45 is switched to the neutral position, and the hydraulic oil pump 53 The discharged hydraulic oil is passed through the hydraulic oil tank 55. Discharge of hydraulic oil from the hydraulic oil pump 53 to the extension side oil passage 37 is stopped, the double operation check valve 47 is closed, the extension side oil passage 37 and the reduction side oil passage 41 are closed, and high pressure operation is performed from the accumulator 51. Oil is discharged to the extension side branch oil passage 39. Since each extension side branch oil passage 39 communicates with each other, all the extension side branch oil passages 39 are maintained at a high pressure by the hydraulic oil discharged from the accumulator 51, and the hydraulic cylinders 29 and 30 are kept extended. Become. Therefore, even after the switching valve 45 is switched to the neutral position, the mast 9 and the guide mounting 13 are fixed, and the inclination angles of the guide mounting 13 and the mast 9 are also fixed.

  When the mast 9 and the guide mounting 13 are fixed and the inclination angles of the guide mounting 13 and the mast 9 are fixed, the drilling machine 14 drills. Since the mast 9 and the guide mounting 13 are fixed during the drilling operation, even if vibration is transmitted from the rock drill 14 to the mast 9 and the guide mounting 13, there is no play between the mast 9 and the guide mounting 13. No stickiness occurs.

  When the drilling by the rock drill 14 is finished, the switching valve 45 is switched to the release position, and the hydraulic oil is discharged from the hydraulic oil pump 53 to the reduction side oil passage 41. The double-operated check valve 47 is opened, the extension-side oil passage 37 and the reduction-side oil passage 41 communicate with each other, and hydraulic oil is supplied to the reduction-side oil chambers 33a, 33b, 33c of the hydraulic cylinders 29a, 29b, 29c. 29a, 29b, and 29c are reduced. When the hydraulic cylinders 29a and 29b are reduced, the mast 9 is released from being fixed to the guide mounting 13, and the mast 9 slides on the guide mounting 13 and can move forward and backward. When the hydraulic cylinder 30 is reduced, the stabilizer 15 is released from being fixed by the guide clamp 25, and the inclination angle of the guide mounting 13 can be adjusted.

Then, the inclination angle of the guide mounting 13 is adjusted according to the next drilling position, and the tip of the mast 9 is moved.
Since the drilling machine 1 includes the mast rattling prevention device as described above, no rattling occurs between the mast 9 and the guide mounting 13 while the drilling machine 14 drills. Further, since the mast clamp 21 and the guide clamp 25 can be controlled simultaneously by the hydraulic circuit 35, the working efficiency is increased.

  In the present embodiment, the stabilizer 15 is formed at the tip of the mast 9, the stabilizer 15 is fixed by the guide clamp 25, and the inclination angle of the mast 9 is fixed. However, as shown in the modification of FIG. Alternatively, a hood pad 57 may be formed at the tip of the mast 9, and the hood pad 57 may be pressed against the drilling position to fix the inclination angle of the mast 9.

It is a side view of a drilling machine provided with the mast rattle prevention device concerning the present invention. It is a side view of a mast mechanism. It is explanatory drawing of a mast clamp, (i) is explanatory drawing of the state from which the mast was released from fixation with a guide mounting, (ii) is explanatory drawing of the state in which the mast and guide mounting were fixed is there. It is a front view of a guide clamp. It is a block diagram of a hydraulic circuit. It is a side view of the drilling machine concerning a modification. It is a side view of a conventional drilling machine. It is a side view of the conventional stabilizer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drilling machine 3 Bogie 4 Bogie frame 5 Boom 7 Mast mechanism 9 Mast 11 Mast truss 13 Guide mounting 14 Drilling machine 15 Stabilizer 17 Guide slide cylinder 19 Guide plate 21a, 21b Mast clamp 23a, 23b Clamp arm 25 Guide Clamp 27 Clamp work 29, 30 Hydraulic cylinder 31 Extension side oil chamber 33 Reduction side oil chamber 35 Hydraulic circuit 37 Extension side oil passage 39 Extension side branch oil passage 41 Reduction side oil passage 43 Reduction side branch oil passage 45 Switching valve 47 Double operated Check valve 49a, 49b Pilot check valve 51 Accumulator 53 Hydraulic oil pump 55 Hydraulic oil tank 57 Hood pad

Claims (2)

  A mast rattle prevention device comprising a mast clamp that fixes a mast that supports a rock drill so as to be capable of moving forward and backward, and a guide mounting that supports the mast so as to be capable of moving forward and backward.   The mast rattle prevention device according to claim 1, further comprising: a guide clamp that fixes a tilt angle of the guide mounting; and a hydraulic circuit that simultaneously controls the mast clamp and the guide clamp.

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