JP3464033B2 - Rod exchange device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod exchanging apparatus capable of reliably detecting the state of a rock drill rod being disconnected. In a drilling device such as a crawler drill or a tunnel jumbo, a shank rod is inserted into a rock drill mounted on a guide shell, and a rod of a predetermined length is inserted into the shank rod via a sleeve. After connecting, a bit is attached to the tip of the rod, and the drill and drill are transmitted from the rock drill to the bit to drill the rock. When the drilling length is longer than the length of the rod, it is necessary to add and recover the rod during drilling work. In the past, the extension and recovery of the rod and the accompanying lubrication of the threaded portion of the rod have been performed manually. However, since a great deal of labor is required, the rod has recently been remotely operated from the driver's seat. A rod exchanging device capable of extending, recovering, and supplying oil to the threaded portion of the rod is used to save labor. Further, when the operator performs these operations, it is necessary to check the connection and disconnection of the rod screws, but it is difficult to visually check from the driver's seat, which imposes a heavy burden on the operator and hinders smooth work. Also, there has been proposed a device provided with a thread cutting detector for detecting a state of thread separation of a rod (Japanese Patent Publication No. 4-239).
No. 1). [0004] However, at the site of drilling work, dust, noise, etc. are frequent and the environment is extremely poor. On the other hand, the conventional threading detector is clamped by a centralizer. Since the switch is installed on the guide shell near the rear end of the sleeve, a proximity switch or a photoelectric switch having a large detection distance is required, so that the cost is increased and the detection is uncertain. The present invention solves such a problem in the rod exchanging device, and uses an inexpensive detector with a small detection distance to reliably connect and disconnect a screw of a rock drill rod. It is an object of the present invention to provide a rod exchanging device which can detect the rod. According to the present invention, a rod exchanging mechanism for extending and recovering a rod of a rock drill mounted on a guide shell so as to be able to move back and forth, and supplying oil to a thread portion of the rod. In a rod exchange device including a refueling mechanism, an arm for movably holding a refueling head of the refueling mechanism to a refueling position is provided with a threading detector for detecting a connection and disconnection state of a rod screw in proximity to the refueling head. The above-mentioned problem is solved by providing it. When the rod is to be extended after the already connected rod has been drilled, the sleeve connecting the rod and the shank rod at the front end of the guide shell is clamped by the centralizer. Then, the rock drill is reversed and retracted, and the screw of the shank rod is cut off. At this time, the arm of the refueling mechanism moves the refueling head to the refueling position, and the refueling head refuels the threaded portion of the shank rod that is pulled out. When the screw is cut off, the thread cutting detector detects the screw separation state, and based on this detection signal, the refueling mechanism stops refueling the refueling head, returns the arm to its original position, and the rock drill rotates. And retreat to the rear end of the guide shell. Here, the threading detector is provided on the arm of the refueling mechanism in proximity to the refueling head,
Since the screw disconnection state is detected near the rear end of the sleeve, the screw disconnection state can be reliably detected even if a detector with a small detection distance is used. Therefore,
There is no danger of erroneously detecting the detached state of the screw and retreating the rock drill while the screw is not completely separated, causing damage to the rod and rock drill. When the rock drill is retracted to the rear end of the guide shell, the rod exchanging mechanism supplies an extension rod to the drilling axis, and the arm of the oiling mechanism moves the oiling head to the oiling position. Lubricates the threaded portion of the extension rod. Then, the rock drill is moved forward and the shank rod is screwed into the sleeve at the rear end of the extension rod, and the thread at the front end of the extension rod is clamped by the centralizer. And the extension is completed. When the threading detector detects that the screw is connected, the rod exchanging mechanism and the oiling mechanism return to their original positions, and drilling is resumed. When the rod is to be recovered after drilling is completed, the rock drill is retracted, the sleeve at the front end of the rod is clamped by the centralizer, the rod is gripped by the rod exchange mechanism, and the rock drill is reversed and retracted. Then, remove the shank rod screw from the sleeve at the rear end of the rod. When the rock drill retracts to the rear end of the guide shell, a rod changing mechanism reverses the rod to separate the rod from the sleeve clamped by the centralizer. At this time, the arm of the refueling mechanism moves to the refueling position, the threading detector is located near the rear end of the sleeve, and when the screw is disconnected, the threading detector detects the disconnected state, and this detection signal is output. , The rod exchange mechanism returns to the original position and stores the disconnected rod. The rock drill advances forward and rotates forward, screwing the shank rod screw into the sleeve clamped by the centralizer. When the threading detector detects the connection state, the lubrication mechanism returns to the original position, and thereafter, the recovery of the next rod is repeated in the same procedure. FIG. 1 is a perspective view of a hydraulic crawler drill provided with a rod exchanging device according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a state of mounting a threading detector, and FIG. It is explanatory drawing of an addition work. In the hydraulic crawler drill 1, a boom 8 is provided on a traveling cart 5 provided with a track frame 2 so as to be able to turn up and down. At the tip of the boom 8, a guide shell 11 on which a rock drill 10 is mounted is tilted. , And swingably supported. A shank rod 3 is inserted into a rock drill 10 mounted on a guide shell 11 so as to be able to move back and forth, and a rod 4 having a predetermined length is connected to the shank rod 3 via a sleeve 7. A bit 6 is attached to the tip, and the blow and the rotation from the rock drill 10 are transmitted to the bit 6 to drill the rock. When the drilling hole length is longer than the length of the rod 4, the rod 4 is added and collected during the drilling operation. For this purpose, the guide shell 11 is provided with a rod exchange device 9 having a known rod exchange mechanism 14 for extending and recovering the rod 4 and an oil supply mechanism 12 for supplying oil to the threaded portion of the rod 4. . A centralizer 13 for holding the rod 4 is provided at the tip of the guide shell 11. The refueling mechanism 12 pivotally supports an arm 16 on the side surface of the guide shell 11, and is provided with a hydraulic cylinder 17 so as to be rotatable. The refueling head 15 is attached to the tip of the arm 16 and is required. , The oil supply head 15 can be moved to an oil supply position near the rod by extending the hydraulic cylinder 17 and oil can be supplied to the threaded portion of the rod 4. The arm 16 is provided with a threading detector 20 for detecting the connection and disconnection of the thread of the rod 4 in proximity to the refueling head 15. The threading detector 20 includes the arm 1
6 is rotated to move the refueling head 15 to the refueling position, and the detached state of the screw is detected. Therefore, an inexpensive proximity switch or ultrasonic switch having a small detection distance can be used. As shown in FIG. 3A, when the drilling of the rod 4a is completed and the rod 4b is to be extended, the rod 4a and the shank rod 3 are formed at the front end of the guide shell 11. 3B is clamped by the centralizer 13 as shown in FIG. 3 (B), and the rock drill 10 is reversed and retreated, and the screw of the shank rod 3 is cut off. At this time, the arm 16 of the refueling mechanism 12 moves the refueling head 15 to the refueling position, as shown in FIG. When the screw is cut off, the thread cutting detector 20 detects the state of the screw being cut off,
Based on this detection signal, the refueling mechanism 12
The refueling of 5 is stopped, the arm 16 is returned to the original position, the rock drill 10 stops rotating, and retreats to the rear end of the guide shell 11. Here, the threading detector 20 is connected to the lubrication mechanism 1.
The second arm 16 is provided in close proximity to the refueling head 15 and is located close to the rear end of the sleeve 7a to detect the state of thread separation. Even if the detector is used, the state of screw separation can be reliably detected. Therefore, there is no possibility that the detached state of the screw is erroneously detected, and the rock drill 10 is retracted in a state where the screw is not completely separated, and the rod 4a or the rock drill 10 is not damaged. When the rock drill 10 retreats to the rear end of the guide shell 11 as shown in FIG. 3 (D), the rod exchanging mechanism 14 as shown in FIG. And the arm 16 of the refueling mechanism 12 moves the refueling head 15 to the refueling position, and the refueling head 15 refuels the threaded portion of the extension rod 4b. Then Figure 3
As shown in (F), the rock drill 10 is moved forward in the forward direction to add the shank rod 3 to the rear end sleeve 7b of the rod 4b.
And the threaded portion at the front end of the extension rod 4b is clamped by the centralizer 13.
a, and the extension is completed. When the threading detector 20 detects that the screw is connected, the rod exchange mechanism 1
4 and the refueling mechanism 12 return to the original position, and the centralizer 1
The hole to loosen the clamp of No. 3 is restarted. When the rod 4b is to be recovered after drilling, the rock drill 10 is retracted, the sleeve 7a at the front end of the rod 4b is clamped by the centralizer 13, and the rod exchange mechanism 14 grips the rod 4b. Then, the rock drill 10 is reversed and retracted, and the screw of the shank rod 3 is separated from the sleeve 7b at the rear end of the rod 4b. When the rock drill 10 retreats to the rear end of the guide shell 11, the rod exchanging mechanism 14 reversely rotates the rod 4b to separate the rod 4b from the sleeve 7a clamped by the centralizer 13. At this time, the arm 16 of the refueling mechanism 12 moves to the refueling position, and the threading detector 20 is located near the rear end of the sleeve 7a.
0 detects the disconnected state, and based on this detection signal, the rod replacement mechanism 14 returns to the original position and stores the disconnected rod 4b. The rock drill 10 moves forward and rotates forward, and the screw of the shank rod 3 is screwed into the sleeve 7 a clamped by the centralizer 13. Threading detector 20
Detects the connection state, the oil supply mechanism 12 returns to the original position, and thereafter, the recovery of the next rod is repeated in the same procedure. As described above, according to the rod exchanging device of the present invention, the threading detector is brought closer to the connecting position between the rod and the sleeve by using the arm of the lubrication mechanism. Using a small and inexpensive detector, the state of connection and disconnection of the screw of the rock drill rod can be reliably detected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic crawler drill provided with a rod exchanging device according to one embodiment of the present invention. FIG. 2 is an explanatory diagram of a mounting state of a threading detector. FIG. 3 is an explanatory view of a rod extension operation. [Description of Signs] 1 Hydraulic crawler drill 2 Track frame 3 Shank rod 4 Rod 5 Traveling carriage 7 Sleeve 8 Boom 9 Rod exchange device 10 Rock drill 11 Guide shell 12 Oil supply mechanism 13 Centralizer 14 Rod exchange mechanism 15 Oil supply head 16 Arm 20 Threading detector

Claims (1)

(57) [Claims] [Claim 1] A rod exchange mechanism for extending and recovering a rod of a rock drill mounted on a guide shell so as to be able to move forward and backward, and an oil supply mechanism for supplying oil to a thread part of the rod. In the rod exchanging device provided with the above, a threading detector for detecting a disconnected state of the thread of the rod is provided on the arm for holding the refueling head of the refueling mechanism movably to the refueling position, in proximity to the refueling head. Characteristic rod exchange device.