JPS6223796Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a connecting device for rods in a taphole drilling machine.

Generally, the taphole drilling machine is as shown in Fig. 1.
A guide cell 8 is supported on the side of the furnace wall 2 of the steel melting furnace 1 by a hacker 4 pivotally connected to a deck 3, a link arm 6 pivotally connected to the main frame 5, and a hanger frame 7 so as to be able to move forward and backward. On the other hand, a bit rod (not shown) and a metal rod 9 are replaced with the guide cell 8 and supported by a rod hanger 10 so as to be able to slide back and forth and rotate. In order to removably connect the hammer 12 to the hammer 12 via the connecting fitting 13, the hammer and rotary machine 11 first rotates and hits the bit rod in a forward direction to break down the furnace wall 2 by about 2/3 of its thickness, and then Replace the metal rod with the metal rod 9, give the metal rod 9 a normal blow to penetrate the remaining 1/3 thickness and open the tap hole, and then give the metal rod 9 a reverse blow with the reverse blower 12 to move the metal rod 9 into the furnace. It is designed to be pulled out from wall 2.

By the way, it is necessary to replaceably attach the bit rod and the metal rod 9 to the tips of the drilling machines 11 and 12 via the connecting fitting 13. As shown in the figure, when the rear part of the metal rod 9 etc. is inserted into the insertion port 14 of the connecting metal fitting 13, the pin 16 provided on the connecting metal fitting 13 and biased by a spring 15 engages with the notch groove 17 of the metal rod 9 etc. It has been proposed that the structure is connected by
No. 32721).

However, when the connecting fitting 13 rotates forward, the metal rod 9
The torque transmission surface 16a of the pin 16, which contacts the side surface 17a of the notched groove 17 and transmits the rotational torque of the drilling machine to the metal rod 9, etc., is small, and since the impact force is directly applied to the pin 16, the pin 16 There was also the problem that burrs were likely to occur, making it difficult to smoothly engage and disengage the pin 16.

The present invention was developed in view of the above-mentioned conventional problems.Basically, instead of the conventional pin, a specially shaped retaining member is provided on the connecting fitting, and the retaining member is attached to the connecting fitting. By forming a torque transmission surface that comes into contact with the bottom surface of the notched groove of a rod such as a metal bar during forward rotation and transmits the rotational torque of the drilling machine to the rod, a torque transmission surface with a sufficient area is obtained, and the retaining member and the rod are A gap is formed in advance between the rod and the notch groove, and the rear end surface of the rod is brought into contact with the bottom surface of the insertion hole of the connecting fitting, so that impact force is not directly applied to the retaining member.
It is designed to be less likely to cause burrs, and even if burrs do occur, engagement and disengagement operations can be performed smoothly.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 3 and 4, the bolt part 22 of the striking shaft 21 of the striking and rotating machine 11 of the drilling machine and the reverse striking machine 12, and the nut part 24 of the base 23 are screwed together and fastened and fixed. The connecting fitting 25 includes a rectangular connecting block 26, and a rod 2 such as a bit rod or a metal rod is attached to the axial center position of the connecting block 26.
An insertion hole 28 is formed into which the rear portion 2a of 7 can be fitted.

The insertion opening 29 of the insertion hole 28 is formed in a cone shape, and the rear edge of the rear part 27a of the rod 27 is formed in a tapered shape to guide the insertion of the rod 27 easily.

A notch groove 30 in the direction perpendicular to the axis is formed in the rear part 27a of the rod 27, and the rear end surface 27b of the rear part 27a is set to abut against the bottom surface 28a of the insertion hole 28.

The connecting block 26 has a slide groove extending perpendicular to the axis and communicating with the insertion hole 28, corresponding to the notch groove 30 of the rod 27, at a position where the rear end surface 27b of the rod 27 abuts the bottom surface 28a of the insertion hole 28. 31, and the flange portions 32a, 32a of the retaining member 32 are slidably fitted into the slide groove 31.

A moving groove 33 communicating with the insertion hole 28 is formed at the lower part of the sliding groove 31 of the connecting block 26 .

Flange portions 32a, 32 of the retaining member 32
The rod 2 is loosely fitted into the moving groove 33 at the lower part of a.
A hook portion 34 is integrally provided that projects into the notch groove 30 of No. 7 and can be engaged with the notch groove 30 from a direction perpendicular to the axis.

The retaining member 32 has flange portions 32a, 32
The coil spring 36 compressed between the spring hole 32b between the holes 32b and the plate member 35 that closes the insertion opening of the retaining member 32 of the slide groove 31 and the moving groove 33 is biased in the engagement direction. The stopper surface 34a at the tip of the hook portion 34 is oriented at an engagement position where it abuts the end surface 33a of the moving groove 33.

In the engagement position of the retaining member 32, the lower end of the hook portion 34 has a locking mechanism that is attached to the lower end of the hook portion 34 when the connecting fitting 25 is rotated in the forward direction (clockwise rotation as indicated by the solid arrow a in FIG. 4).
The rod 27 contacts the bottom surface 30a on the right side of the axis center of the notched groove 30 and transfers the rotational torque of the drilling machine to the rod 27.
7, and when the connecting fitting 25 rotates in the opposite direction (when rotating to the left as indicated by the dotted arrow b in FIG. An engagement release surface 34c is formed upward to the left that contacts the left bottom surface 30a and moves the retaining member 32 in the engagement release direction against the biasing force of the coil spring 36.

Both side surfaces 34d, 34d of the hook portion 34 and both side surfaces 30b, 30b of the notch groove 30 of the rod 27.
A gap t is formed at a position where the rear end surface 27b of the rod 27 abuts the bottom surface 28a of the insertion hole 28.

If the connecting fitting 25 is configured as described above, when the rod 27 is attached, the rear part 27a of the rod 27 can be attached.
from the insertion hole 29 of the connecting block 26 to the insertion hole 28
As the tapered rear edge comes into contact with the disengagement surface 34c of the hook portion 34 of the retaining member 32, the retaining member 32 resists the biasing force of the coil spring 36 and disengages. Since it is moved in the direction, Rod 2
7 until the rear end surface 27b of the rear portion 27a of the insert hole 28 comes into contact with the bottom surface 28a of the insertion hole 28.

After completing the insertion of rod 27,
7 by hand in either the forward or reverse direction, the notched groove 3 of the rod 27 will be inserted into the hook portion 34 of the retaining member 32.
0 is engaged, and the rod 27 is held in a non-removable manner.

Then, when a positive rotational force (arrow a) is applied to the connecting fitting 25 by the impact and the rotating machine 11, the torque transmitting surface 34b of the hook portion 34 of the retaining member 32
comes into contact with the bottom surface 30a of the notched groove 30 of the rod 27, thereby transmitting rotational torque to the rod 27.

Furthermore, when an impact force (forward or reverse) is applied to the connecting fitting 25, it is directly transmitted from the rear end surface 27b to the rod 27 via the bottom surface 28a of the insertion hole 28, and the hook portion 34 of the retaining member 32 and rod 27
Since there is a gap t between the hook portion 34 and the notch groove 30, burrs are less likely to occur in the hook portion 34, and even if burrs occur, there will be no problem in engaging and disengaging operations.

Next, when replacing rod 27,
7 in the forward rotation direction (reverse rotation direction (arrow b) when viewed from the connecting fitting 25), the bottom surface 30a of the notch groove 30 of the rod 27 contacts the engagement release surface 34b of the hook portion 34 of the retaining member 32. Upon contact, the retaining member 32 is moved in the disengagement direction against the biasing force of the coil spring 36, and in this state, the rod 27 can be smoothly pulled out from the insertion hole 28.

As is clear from the above explanation, the present invention
The retaining member provided on the connecting fitting is engaged with the notch groove of the rod fitted into the insertion hole, and the retaining member forms a torque transmission surface and an engagement release surface. During forward rotation, the torque transmission surface contacts the bottom of the notched groove of the rod and transmits rotational torque to the rod. In addition, when the connecting fitting is reversed, the disengagement surface comes into contact with the bottom surface of the notch groove of the rod, and the retaining member can be moved to disengage and disengage against the biasing force.
The rod can be removed quickly.

Furthermore, the striking force from the connecting fitting is directly transmitted to the rod by the bottom surface of the insertion hole and the rear end surface of the rod, and a gap is formed between the retaining member and the notch groove of the rod. No impact force is applied, so burrs are less likely to occur, and even if burrs occur, engagement and disengagement operations can be performed smoothly due to the gaps.

[Brief explanation of the drawing]

Figure 1 is a side view of the taphole opening machine, Figure 2a is a side sectional view of a conventional connecting fitting, and Figure 2b is Figure 2a.
3 is a side sectional view of the connecting fitting according to the present invention, and FIG. 4 is a sectional view taken along the line A-A in FIG. 3. 25... Connecting metal fittings, 26... Connecting block, 2
7... Rod, 27a... Rear end, 27b... Rear end surface, 28... Insertion hole, 28a... Bottom surface, 30...
Notch groove, 30a...Bottom surface, 30b...Both sides, 3
2... Removal prevention member, 34... Hook portion, 34b...
...Torque transmission surface, 34c... Disengagement release surface, t...
gap.

Claims (1)

[Scope of Claim for Utility Model Registration] A device for removably attaching a rod such as a metal rod to the tip of a drilling machine via a connecting fitting, in which a notch groove in the direction perpendicular to the axis is formed in the rear part of the rod, The connecting fitting is formed with an insertion hole into which the rear part of the rod can be fitted, and the connecting fitting is provided with a retaining member that can be engaged with the notch groove of the rod from a direction perpendicular to the axis, and the retaining member is engaged. The retaining member includes a torque transmitting surface that contacts the bottom surface of the notch groove of the rod and transmits the rotational torque of the drilling machine to the rod during forward rotation of the connecting fitting. , an engagement release surface that comes into contact with the bottom surface of the notch groove of the rod and moves the retaining member in the disengagement direction against the elastic member when the connecting fitting rotates in reverse; In a taphole drilling machine characterized in that a gap is formed between the rod and the notch groove with the rear end surface of the rod in contact with the bottom surface of the insertion hole of the connecting fitting. Connecting device for rods.