JPH0128155Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rod changing device that adds rods to a rock drill or recovers rods therefrom.

(Prior art) In a rock drilling machine, a rod is connected to the shank rod of the rock drilling machine via a coupling, and a bit is attached to the tip of the rod. A blow and rotation are applied to the bit through the rod, and the bit is used to strike the rock and make a hole. In this type of rock drilling machine,
When drilling deep holes, connecting rods are successively added via couplings between the shank rod and the rod to which the bit is attached, so that the bit reaches the desired depth. When the drilling of such a deep hole is completed, the connecting rod is recovered. In this recovery operation, first, the joints of the couplings connecting each connecting rod are loosened by applying a blow with a rock drill. Next, move the rock drill back on the guide cell to the recovery position and pull up the connecting rod by one length. Clamp the coupling at the front end of the rod with the centralizer to prevent the rod connected to the front end of the connecting rod to be recovered from falling. Thereafter, the connecting rod is removed from the coupling that is clamped on the centralizer, and then the rear end is removed together with the coupling from the shank rod. The connecting rod thus removed is stored in a predetermined storage location. On the contrary, when adding a connecting rod, prepare a connecting rod with a continuous coupling at the rear end, connect the tip to the coupling that is clamped by the centralizer, and connect the rear end to the coupling rod that is clamped by the centralizer. This is done by connecting to the shaft via a coupling.

Here, there is a rod change device as a device for adding or recovering such connecting rods. This device has a front clamper that grips the tip side of the connecting rod and a rear clamper that grips the coupling ring connected to the rear end. Both clampers are hydraulically driven to connect the rod. Work is being done to add and collect used rods.

(Problems to be Solved by the Invention) However, both clampers require separate drives in such operations. That is, when one of the two holds the rod in a non-rotatable manner, the other may have to hold the rod in a rotatable state. For this reason, in the past, the drive control of both clampers was performed separately, and each clamper had to be operated separately during the drive operation, making it easy to perform the connecting and collecting operations. I couldn't do it.

The object of the present invention is to provide a rod change device that can interlock both clampers.

(Means for Solving the Problems) For this purpose, in the present invention, a step is added to the gripping surface of the rear clamper for gripping the coupling ring to form the first and second gripping surfaces, and both the front and rear clampers are interlocked. When the front clamper is in a state where it is gripping the rod, the first gripping surface of the rear clamper can grip the coupling at the rear end of the rod, and the second gripping surface can simply keep the coupling in the held state. It is possible.

That is, in FIG. 1, 4 is the front clamper;
5 is a rear clamper, and the rear clamper 5 has first gripping surfaces 59b, 60b and second gripping surfaces 59a, 6.
0a is formed. Reference numeral 11 denotes a rod, and a coupling 10 is screwed onto the rear end thereof, and is connected to the shank rod 2a via this coupling 10. Both clamps 4 and 5 are interlocked,
When the front clamp 4 grips the rod 11 as shown, the first gripping surfaces 59b, 6 of the rear clamp 5
Although the coupling ring 10 is gripped by the second gripping surfaces 59a and 60a, it is not gripped by the second gripping surfaces 59a and 60a. Therefore, by moving the rod 11 in the direction of the material axis and positioning the coupling 10 at the position shown by the solid line and the position shown by the dashed line, both clampers 4 and 5 can be moved without having to be driven separately. The gripping and holding state of the rear clamper 5 can be formed.

(Example) Examples of the present invention will be described below with reference to the drawings.

FIG. 2A shows a rod change device according to the present invention. In the figure, 1 is a guide cell, and 2 is a rock drill mounted on this guide cell 1. The rod change device 3 is disposed on the side of the guide cell 1, and a front clamper 4 and a rear clamper 5 are connected by a rotating shaft 6, and side walls of the guide cell 1 are respectively attached to both ends of the rotating shaft 6. It is rotatably supported by support members 7 and 8 attached to. Furthermore, the front end 6a of the rotating shaft 6 is supported by a support member 9 attached to the guide cell 1, and the rear end 6b is supported by a drive mechanism 17.
It is connected to and rotates around its shaft.

On the other hand, a connecting rod 1 is connected to the tip of the shank rod 2a of the rock drill 2 via a coupling 10.
1 are continuous, and the front end of the connecting rod 11 is connected via a coupling 12 to a rod 14 having a bit 13 at its tip. Reference numeral 16 denotes a centralizer, which is arranged on the guide cell 1 in front of the rod change device 3.

Here, the front and rear clampers 4 and 5 in the rod change device 3 are for attaching and recovering the connecting rod 11 located between the shaft rod 2a and the centralizer 16, respectively, and the front clamper 4 is for the purpose of attaching and recovering the connecting rod 11 located between the shaft rod 2a and the centralizer 16, respectively. The rear clamper 5 is located on the front side of the rod 11, and the rear clamper 5 is located on the side of a coupling 10 connected to the rear end of the rod 11.

FIG. 3 shows a side view of the rear clamper 5. In the figure, 51 is an outer cylinder connected to the rotating shaft 6, and inside this outer cylinder 51 is a telescopic cylinder 5.
2, a telescopic arm 53 that can be extended and contracted is inserted. Gripping pieces 56 and 57 are attached to the tips of the telescopic arm 53 by shafts 54 and 55, respectively. Of these, the gripping piece 56 is rotatable about the shaft 54, and its base end is rotatably connected to the piston rod 58a of the clamp cylinder 58. On the other hand, the gripping piece 57 is rotatable about a shaft 55, and its base end is attached to a clamp cylinder 58 via a shaft 59.
Curved gripping surfaces 59 and 60 are formed on opposing surfaces of the tip ends of both gripping pieces 56 and 57.

The shape of this gripping surface is as shown in Figure 1.
Second gripping surfaces 59a and 60a on the front clamper 4 side and first gripping surfaces 59b and 60b that are closer to each other than those gripping surfaces are formed with a step.

Referring again to FIG. 3, the clamper 5 having the above structure is configured to rotate around the axis 6a of the rotating shaft 6 between the positions shown by the solid line and the dashed line in the figure. Directly below, a storage 18 for the connection rod 11 is arranged.

On the other hand, the configuration of the front clamper 4 is also the same as the rear clamper 5 except for the gripping surface. As shown in FIG. 1, the gripping surfaces 41 and 42 of the front clamper 4 are flat surfaces in the direction of the material axis. In addition, both clampers 4 and 5 are operated by the same hydraulic circuit.
They are designed to be driven in conjunction with each other.

In this embodiment configured as described above, the recovery operation of the connecting rod 11 will be explained.

First, the screws at the front and rear ends of the connecting rod 11 are loosened by rotating the connecting rod 11 in the opposite direction while applying a blow under no load. Next, as shown in FIG. 2A, the connecting rod 11 is pulled up and the coupling 12 at its front end is gripped by the centralizer 16. Next, open the gripping pieces of the clampers 4 and 5 located at the position indicated by the dashed line in FIG.
After retracting, the clampers 4 and 5 are rotated by the rotary shaft 6 to take the position shown by the solid line in FIG. In this state, the telescopic arm 53 is extended so that the connecting rod 11 and the rear end coupling 10 are positioned between the gripping surfaces of the clampers 4 and 5.

Next, the gripping pieces of both clampers 4 and 5 are closed, and the front clamper 4 grips the rod 11 so that it cannot rotate. At this time, as shown in FIG. 2B, in the rear clamper 5, the second gripping surfaces 59a, 6
Since the rear end coupling 10 is located between 0a, the coupling 10 is moved by the rear clamper 5.
is not gripped, but simply held in a freely rotatable state (see Figure 1).

In this state, the shank rod 5a is rotated forward and the shank rod 2, which is in a loose state, is
a. Retighten the threaded portions of the coupling 10 and rod 11 to tightly connect these three members. Next, both clampers 4 and 5 are interlocked to open the gripping piece, so that the gripping piece of the front clamper 4 holds the rod 11 rotatably. At this time, the rear clamper 5
The gripping piece also opens in conjunction, but the holding state of the coupling ring 10 is maintained. In this way, when both clampers 4 and 5 are held in the holding state and the shank rod 2a is pulled up while rotating in the opposite direction, the front end of the rod 11 and the centralizer 1 are separated as shown in FIG. 2C.
The thread between the coupling ring 12 gripped by 6 and the coupling ring 12 is cut. Here, the lifting amount of the shank rod 2a is appropriately determined so that the rear end coupling 10 of the rod 11 is located between the first gripping surfaces 59b and 60b of the rear clamper 5.

In this state, when the gripping pieces of both clampers 4 and 5 are closed and the front clamper 4 is brought into the gripping state,
The coupling ring 10 is also gripped by the first gripping surfaces 59b, 60b of the rear clamper 5 in a non-rotatable state (see FIG. 1). In this state, when the shank rod is pulled up while rotating in the opposite direction, the thread between the shank rod 2a and the coupling 10 is cut, as shown in FIG. 2d.

Thereafter, the rod 11 with both ends cut off is stored in the storage 18 by the clampers 4 and 5 (see FIG. 3).

Note that the work of adding rods 11 can be performed in the same manner.

(Effect of the invention) As explained above, according to the invention, a step is provided on the gripping surface of the rear clamper, and the first and second
Since the gripping surfaces are formed, by interlocking both clampers, when the front clamper grips the connecting rod in a non-rotatable state, the first gripping surface of the rear clamper can grip the coupling rod in a non-rotatable state. , the second gripping surface allows the coupling to be rotatably held. Therefore, there is no need to separately drive and control both clampers as in the prior art, and rod addition and recovery operations can be performed simply and easily.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the shape of the gripping surface of the clamper according to the present invention, FIGS. 2A to 2D are plan views showing the rod recovery process, and FIG. 3 is a side view showing the shape of the clamper. 1... Guide cell, 2... Rock drill, 2a...
Shank rod, 3... Rod change device, 4
...Front clamper, 5...Rear clamper, 10...
...Coupling, 11... Rod, 41, 42...
...Gripping surface, 59a, 60a...Second gripping surface, 59
b, 60b...first gripping surface.

Claims (1)

[Claims for Utility Model Registration] The rock drilling machine has a front clamper for gripping the rod and a rear clamper for gripping the coupling ring connected to the rear end of the rod, and the front and rear clampers are operated. In the rod change device for attaching and removing rods to and from the shank rod, the gripping surface of the rear clamper is stepped to form first and second gripping surfaces, and the front and rear clampers are interlocked. When the front clamper grips the rod so that it cannot rotate,
A rod change device for a rock drilling machine, characterized in that the first gripping surface is capable of non-rotatably gripping the coupling, and the second gripping surface is capable of rotatably holding the coupling.