JPS6251360B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for detecting the attachment and detachment of a rod in a drilling machine such as a crawler drill. 2. Description of the Related Art Drilling for blasting in mines and general civil engineering works is carried out using a drilling machine such as a crawler drill shown in FIG. In this crawler drill, a guide cell 3 is rotatably provided at the other end of a boom 2 whose base end is pivotally supported by a main body 1. And this guide cell 3
A chain 5 driven by a hydraulic motor 4 is wound around the chain 5 in its longitudinal direction, and a drifter 6 is moved on the guide cell 3 by this chain 5. The drifter 6 has a built-in hydraulic motor (not shown), and drilling rods 8 and 9 are screwed to a rotating shaft (shank rod) 7 of the motor (see FIG. 2). Further, a male thread 10 and a female thread (sleeve) 11 are provided at the tip and rear end of each drilling rod, respectively, and a bit 12 is provided at the tip of the foremost drilling rod 9. The crawler drill forms a hole H in the ground G by rotating the drifter 6 and moving it forward on the guide cell 3. During drilling, air is blown out from the bit 12 via the drilling rods 8 and 9.
Also, in order to prevent dust from being generated from the ground G at this time, a dust hood 13 is installed at the tip of the guide cell 3.
is provided. This type of crawler drill has a rod clamp 14 for clamping the drilling rod and a sleeve clamp 15 for clamping the sleeve 11 of the drilling rod at the tip of the guide cell 3. A sleeve lock 16 for clamping the drifter 11 is provided near the drifter 6. Furthermore, a magazine (not shown) for storing a plurality of drilling rods is arranged side by side on the side of the guide cell 3. Each of the above actuators (rod engine)
operates when replenishing and retrieving the drilling rod. Here, the operation of the rod changer when adding drilling rods will be explained with reference to the operation sequence diagram shown in FIG. After placing the bit on the bottom of the hole, move the drifter 6 about 5
Retract by ~10 mm, insert the impactor lever (not shown), and strike the shank rod 7 several times. This operation loosens the threaded connection between the shank rod 7 and the sleeve 11. Close the rod clamp 14 and clamp the drilling rod. Close the sleeve clamp 15 and remove the sleeve 11.
Then, the rotator of the drifter 6 is reversed, and the drifter 6 is slowly retreated to release the threaded connection between the shank rod 7 and the sleeve 11. Once the screw connection is removed, remove the sleeve clamp 15.
is opened and the drifter 6 is moved back to the rod exchange position at high speed. In addition, when reversing, grease is sprayed onto the threaded surface of the shaft lock 7, and the rod lock 16 is
Move the screw up and down along the shank rod 7 to apply grease to the entire threaded surface. The magazine 17 storing the drilling rods is moved to bring the drilling rods to a replenishment position on the shaft of the shank rod 7. While slowly rotating the rotator forward, the drifter 6 is slowly advanced, and the syan rod 7 is
A threaded joint (upper threaded joint) is performed between the sleeve 11 and the sleeve 11. After confirming the upper screw connection, the drifter 6 is moved back to the rod replacement position again. After the drifter 6 retreats, the magazine 17 is evacuated. The drifter 6 is advanced to the upper screw connection position (dashed line). While slowly rotating the rotator in the normal direction, the drifter 6 is slowly advanced to perform a screw connection (lower screw connection) between the drilling rods. After checking the bottom screw connection, open the rod clamp 14. With the above operations, the addition of one rod is completed. Next, the operation of the rod changer when retrieving the drilling rod will be explained with reference to the operation sequence diagram shown in FIG. Same operation as when adding rods. Close the rod clamp 14 and clamp the drilling rod. Rotate the rotator of the drifter 8 in the normal direction, and retighten the screw connections loosened by the operation. This is done to ensure a secure threaded connection and to prevent the rod from falling during subsequent operations. Open the rod clamp 14. The drifter is moved back to a position where the sleeve 11 rests on the sleeve clamp 15. Close the rod clamp 14 and sleeve clamp 15. The rotator of the drifter 6 is reversed and the drifter 6 is slowly retreated to separate the sleeve 11 on the sleeve clamp 15 from the drilling rod (remove the lower screw). The magazine 17 is moved to accommodate the cut-off drilling rod. The drifter 6 is advanced and the drilling rod is stored in the magazine 17. The sleeve lock 16 is lowered to fix the sleeve 11 of the drilling rod, the rotator of the drifter 6 is reversed and the drifter 6 is slowly retreated, and the shank rod 7 and the sleeve 1 are
1 (remove the top screw). After the top screw is removed, the magazine 17 is evacuated. The drifter 6 is advanced at high speed, the sleeve lock 16 is raised, and then the sleeve clamp 15 is opened. The rotator of the drifter 16 is rotated in the normal direction, and the drifter 16 is slowly advanced to screw the shank rod 7 into the sleeve. After the shunt rod 7 and the sleeve are screwed together, the rod clamp 14 is opened. With the above operations, the collection of the first rod is completed. The second and subsequent rods are recovered by returning to the operation from step 1 and repeating the above operations again. By the way, in the above-mentioned rod adding operation, it is necessary to confirm that the upper screw has come off when transitioning from the operation to the operation, and when transitioning from the operation to the operation and from the operation to the operation. It is necessary to check the upper threaded joint and lower threaded joint respectively. In addition, during the rod retrieval operation, it is necessary to confirm that the lower screw and upper screw have come off, respectively, when transitioning from the operation to the operation and when transitioning from the operation to the operation. It is necessary to check the upper threaded joint when moving to . For example, there is a problem in that if the sequence is moved to the next sequence with the screws being unscrewed incompletely, the operations will interfere, and if the sequence is moved to the next sequence with the screws being incompletely connected, the rod will fall. However, in the past, the above-mentioned confirmation was performed manually, ie, by visual judgment by the operator, and therefore it was not possible to automatically perform the rod adding operation and the rod collecting operation using an electric circuit. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for detecting attachment and detachment of a rod in a drilling machine, which automatically detects attachment and detachment between a shank rod and a drilling rod, and between the drilling rods. According to this invention, the air blown into the drilling rod during drilling is blown at the time of adding and retrieving the drilling rod, the pressure of the blown air is detected, and the pressure change of the detected air ( Attachment and detachment between the shunt rod of the drifter and the drilling rod or between the drilling rods is detected based on pressure changes caused by pipe friction within the drilling rod. Hereinafter, the present invention will be described in detail with reference to an embodiment of the accompanying drawings. FIG. 5 is a block diagram showing an air supply system diagram used for implementing the method according to the present invention and an example of an apparatus for implementing the method according to the present invention. First, the air supply system diagram will be explained. In order to facilitate drilling, crawler drills have conventionally been equipped with a device for blowing air from the bit 12 at the tip of the drilling rod. When blowing air, a compressor 21 is driven by an engine 20, and the air compressed by the compressor 21 is sent out through a receiver tank 22 and a valve 23. One part of the air sent out from the valve 23 is supplied to the bit 12 via the drifter 6, the sink rod 7, and the drilling rod, and the other part is supplied to the dust collector 25 via the air filter 24. The dust collector 25 sucks the air in the holes H and the dust hood 13 using the fan 26, discharges the dust sucked together with the air from its lower part 25a, and exhausts the air from its upper part 25b. Note that the air supplied to the dust collector 25 via the air filter 24 is used to blow off the dust inside the dust collector 25. The above air blowing device is also used when adding and recovering rods. Note that during use, this device is controlled to blow air at a constant flow rate. The pressure of air delivered from receiver tank 22 is applied to pressure switches 27 and 28. The pressure switch 27 is turned on when the air pressure reaches the air pressure that is blown when one drilling rod is connected to the shank rod 7, and the pressure switch 28 is turned on when the air pressure reaches the air pressure that is blown when two drilling rods are connected to the shank rod 7. Turns on when the air pressure exceeds the air pressure blown when the drilling rod is connected. The increase in air pressure caused by the connection of the drilling rod is due to the friction of the pipe within the connected drilling rod under the condition of a constant flow of air. The output signals (“1” or “0”) of the pressure switches 27 and 28 are output from the central processing unit (CPU).
Added to 29. Further, output signals (“1” or “0”) of limit switches LS ₁ to _{LS 5} which are turned on and off depending on the position of the drifter 6 are applied to the CPU 29 . Here, the limit switch LS ₁ is arranged at the lowest position (drilling end position) of the drifter 6, the limit switch LS ₂ is arranged at the feed speed switching position of the drifter 6, and the limit switch LS ₃ is arranged when the lower screw is connected. The limit switch LS ₄ is arranged at the position when the upper screw is connected, and the limit switch LS ₅ is arranged at the highest position of the drifter 6. The CPU 29 drives the driver circuit 30 based on the pressure switches 27, 28, limit switches _LS1 to _LS5 , and proximity switches (not shown) that detect the operation of each rod changer.
and control the rod engine. CPU29
In the sequence control during rod addition and retrieval, the attachment and detachment of the drilling rod is ensured by combining the outputs of pressure switches 27 and 28 and the outputs of limit switches LS ₁ to LS ₅ as shown in Table 1. I am trying to detect it.

[Table] As is clear from Table 1, the connection and disconnection of the upper screw is detected by turning on and off the pressure switch 27, and the connection and disconnection of the lower screw is detected by turning the pressure switch 28 on and off. In addition, screw connections are detected by turning on the pressure switch, and screw removal is detected by turning on the pressure switch.
Detected by turning off the pressure switch. The CPU 29 checks whether rod joining or removal has been performed during the sequence shown in Table 1, and if rod joining or removal has been performed, proceed to the next sequence, and if incomplete, stop the sequence there. . In this way, the combination of the output of the pressure switch and the output of the limit switch makes it possible to reliably detect rod joining or rod disconnection. Incidentally, as is clear from Table 1, it is possible to detect rod joining or rod disengagement using only the output of the pressure switch. As explained above, according to the present invention, attachment and detachment of the drilling rod can be reliably detected by the pressure of the air blown to the drilling rod, and the rod addition and recovery of the drilling machine can be automated. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing a drilling machine embodying the present invention, Fig. 2 is a diagram showing the screwing mode between the shank rod and the drilling rod, and between the drilling rods, and Fig. 3 is a diagram showing the screw connection between the shank rod and the drilling rod. 4 is an operation sequence diagram of the rod changer during rod recovery, and FIG. 5 is an air supply system used to implement the method according to the present invention and an apparatus for implementing the method according to the present invention. It is a figure showing an example. 3...Guide cell, 5...Chain, 6...Drifter, 7...Shank rod, 8, 9...Drilling rod, 11...Sleeve, 12...Bit, 13...Dust hood, 14...Rod clamp, 15...Sleeve clamp, 16...Three Block, 21... Compressor, 25... Dust collector, 27, 28...
Pressure switch, 29...Central processing unit, 30...Driver circuit, _LS1 to _LS5 ...Limit switch.

Claims (1)

[Scope of Claims] 1. Air blown into the drilling rod during drilling is blown when adding and retrieving the drilling rod, the pressure of the blown air is detected, and the pressure change of the detected air is 1. A method for detecting attachment and detachment of a rod in a drilling machine, comprising detecting attachment and detachment between a shank rod of a drifter and a drilling rod or between a drilling rod based on the method. 2. The method for detecting attachment and detachment of a rod in a drilling machine according to claim 1, wherein the change in air pressure is caused by friction of a pipe inside the drilling rod.