JPH0650533Y2 - Rod chucking jig for tap hole opening device - Google Patents

Description

[Detailed description of the device]

[0001]

TECHNICAL FIELD The present invention relates to a rod chucking jig for a tap hole opening device of a blast furnace, and more specifically, a gold rod shank and a shank screw rod (power transmission shaft).
The present invention relates to a rod chucking jig for a tap hole opening device, which can firmly connect and without loosening.

[0002]

[Background Art] With recent technological innovation, blast furnaces (blast furnaces)
The size is increasing and the volume is 4000 to 5000 m ³ , and the height is as high as 30 m. As is well known, hot metal from a blast furnace (blast furnace) is made to flow from a tap hole provided in a steel shell around the lower part of the blast furnace to a large gutter through a hole opened by driving a gold rod with a hole opening device to a furnace refractory wall. However, as the size of the blast furnace increases, the thickness of the in-furnace refractory wall will also increase, and in order to open the tap hole for the hot metal in this thick in-furnace refractory wall, regarding the hole opening device, Greater power and durability are being demanded.

This work by the opening device is performed by driving a gold rod connected to the drifter with a forward and reverse hammer, but because of the necessity of exchanging the gold rod, the gold rod is passed through the rod drift chucking jig to the air drifter. It is connected. As the power applied to the rod chucking jig increases, the durability of the rod chucking jig needs to increase.

Conventionally, as a rod chucking jig in an opening device, one using a chain or a cotter for attaching a gold rod to the rod chucking jig is known (Japanese Patent Laid-Open No. 60-145305). 62
-182961). However, in these jigs, the attachment and detachment of the gold rod is done manually,
Furthermore, the impact of pulling out the gold rod by reverse impact acts on one side of the cotter, so that the cotter is easily damaged, and the chain is also damaged by the impact, so that there is a big problem in durability.

On the other hand, assuming that the gold rod is automatically attached and detached,
It is known that a gold rod is automatically attached / detached to / from a drive unit by remote control using a hydraulic or pneumatic cylinder (Japanese Utility Model Publication No. 57-192946). Since such an automatically attachable / detachable rod chucking jig has an eccentric structure, it has a drawback that the rotational balance is poor and the structure is complicated.

In addition, since the chucking jig and the gold rod or the shank squeeze rod (power transmission shaft) employ a lock mechanism using a mating piece and an ordinary screw screwing means, the gold rod is tapped. When removing after driving into the hole, the shank screw rod is rotated in the reverse direction to retract the hole opening device, and then the entire device is retracted.
There is a drawback in that the screwing of the chucking is likely to come off during the reverse rotation. Furthermore, when the gold rod is pulled out, the cotter engaged in the groove of the gold rod is damaged, the spring that slides the cotter is damaged, or the function of the spring itself is lost. There are technical challenges that must be met.

The temperature near the taphole and on the gutter is about 1000.
Although it is under a high temperature of ℃, the opening work is performed by remote control in such an environment, therefore, the above troubles have to interrupt the opening work for a long time, Further, the consumption of expensive parts is a cause of increasing the production cost.

[0008]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted various studies in order to solve the above-mentioned various problems with respect to a rod chucking jig for a tap hole opening device of a blast furnace. (Transmission shaft) Stepped part of the built-in two-piece bush, attach the shank screw rod to the rod chuck king jig using the clamp nut,
On the other hand, with regard to the gold rod shank, by adopting a structure in which the lug convex portion attached to the gold rod shank and the eccentric 90 ° groove in the chuck portion are engaged with each other, the attachment / detachment of the gold rod is automatically performed by the conventional remote operation, and Succeeded in developing a chucking jig that can efficiently perform hole opening work without loosening against the impact of a forward / reverse impact hammer, even when the rotary motor rotates forward / reversely. did.

That is, the present invention is a rod chucking jig for a taphole opening device of a blast furnace, in which a shank squeeze rod (4) is fitted to the outer circumference and inner circumference of one end of the jig. It is threaded for tightening, and the clamp nut (1) is screwed to the outer periphery by sandwiching the two-piece bush (2), and the other end has an inward shank (1).
The present invention provides a rod chucking jig for a tap hole opening device, in which a chuck part (7) for mounting 1) is formed. The present invention is also the above jig, wherein the chuck portion (7) has a guide groove (8) reaching the eccentric 90 ° groove (9) for mounting the gold rod shank (11), and the eccentric 90 ° groove. On the inlet side of (9), the taper (13) of the lug protrusion (12) of the gold rod shank (11).
The present invention provides a rod chucking jig for a tap hole opening device, which is formed with a taper (10) that matches with.

Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment of a rod chucking jig according to the present invention.

FIG. 1 is a view showing a state at the time of a hole-opening operation of a taphole opening device (a blast furnace portion is shown in a sectional view). In FIG. 1, the jig according to the present invention is shown as (A). In the field, the names of such jigs are given as rod heads, tapping sockets, rod chucking jigs, etc.
In the present invention, it is called a rod chucking jig. 2 is a sectional view of a rod chucking jig according to the present invention, FIG. 3 is a sectional view taken along the line XX in FIG. 2, and FIG. 4 is a sectional view taken along the line YY in FIG. , And FIG. 5 respectively show side views of the gold bar shank.

A rod chucking jig (A) shown in FIG.
, (1) is a clamp nut, (2) is a split bush, (4) is a shank screw rod (power transmission shaft), (5) is a guide fitting, and (7) is a chuck. Shown respectively.

The end of the rod chucking jig (A) on the side to which the shank screw rod (4) is connected is threaded on both the outer and inner circumferences, and the inside of the screw from the rotary motor (C). The shank screw rod (power transmission shaft) is screwed together, and a bag-shaped clamp nut (1) is attached to the outer surface of the split bush (2) that is inserted from the neck portion (stepped portion) of the shank screw rod (4). By sandwiching them, the Shank's screw rod (4) is firmly connected. At that time, lock washer (3)
By using, it is possible to bond more firmly. The lock washer (3) has cutouts formed at several locations around the lock washer, and the cutouts can be bent and attached to corresponding recesses provided on the rod chucking side.

On the other hand, a chuck portion (7) is formed at the other end of the rod chucking jig (A), and its entrance is used when the gold rod shank (FIG. 5) is chucked by the chuck portion (7). The guide has a wide mouth structure so that the centering of the gold rod shank and the chuck portion can be easily performed.
This inlet may be made of the same material and integrally molded into a wide-mouthed structure, but a separate guide socket metal fitting (5) processed into a trumpet shape shown in FIG. 2 is welded by using a ring (6). The integrated structure is a preferred mode for facilitating replacement when the inlet is damaged. A guide groove (8) into which the lug convex portion of the gold rod shank is inserted is cut at a symmetrical position on the inner surface of the chuck portion, and this guide groove reaches an eccentric 90 ° groove (9) provided inside the chuck portion.
The eccentric 90 ° groove (9) is eccentrically arranged as shown in FIG.
It is grooved into a V shape, and the insertion side of the gold rod shank has a taper (1) of the lug projection (12) of the gold rod shank.
3) The taper (10) is attached so as to be aligned with the surface.

As shown in FIG. 5, the rod shank (11) is provided with symmetrical lug protrusions (12) which engage with the eccentric 90 ° grooves (9) in the chuck (7). . The lug projection has an inclined surface (taper 13) aligned with the taper (10) on the insertion opening side of the eccentric 90 ° groove (9) in order to prevent wear of the lug projection when pulling out the driven metal rod shank. ) Is attached. If necessary, the gold rod shank (11) is provided with a chuck part (7) for the hot metal at a position near the chuck part inlet of the rod chucking jig.
In order to prevent the metal from jumping in, a hot metal jumping-in prevention plate (15) having an inner diameter of the chuck portion or a diameter slightly larger than the inner diameter is provided. This gold rod shank is used by connecting gold rods (14) having a desired length, which are generally used, integrally by welding.

Gold bar shank (11) and chuck part (7)
The connection with the guide groove (8) is achieved by rotating the rod chucking jig by the operation of the drifter and aligning the guide groove on the inner surface of the chuck with the lug protrusion (12) of the gold rod shank.
After inserting the shank of the gold rod to the end of the inside of the chuck part, rotate the rod chucking jig 90 ° forward by the drifter (B), and the lug convex part is fitted into the eccentric 90 ° groove in the chuck. The shank is fixed in the chuck part.

As described above, due to the connection between the lug convex portion (12) of the gold rod shank and the eccentric 90 ° groove (9) in the chuck portion, the force for pulling out the gold rod shank driven into the furnace is tapered. On the contact surface of
The protrusion of the lug is prevented from being worn, and the further the gold rod shank is pulled, the closer it is to the center of the chuck portion and the stronger the connection.
These provide extremely good effects not found in conventional devices.

Next, a method of operating the tap hole opening device using the rod chuck jig according to the present invention will be described with reference to FIG.

When a gold rod is driven into the tap (K) of the blast furnace, the gold rod shank is lifted up to the position of the rod chucking jig by an automatic desorption device (not shown) for the gold rod shank, and then the feed motor- Drifter with (G) (B)
And the gold rod shank is inserted deep into the chuck portion, the rotary motor (C) of the drifter is rotated in the forward direction, and is rotated 90 ° to fit the lug convex portion of the gold rod shank into the eccentric 90 ° groove in the chuck portion. Next, after stopping the rotary motor and aligning the hole opening device with the tap hole, the feed motor advances the drifter, and when the tip of the gold rod contacts the tap hole, activate the positive impact hammer (D) of the drifter. When the gold rod pierces the furnace wall, at the same time it moves the drifter forward to drive the gold rod continuously, and after driving it to a predetermined position, rotate the drifter 90 degrees reversely to remove the gold rod shank from the chuck part and guide the drifter with the feed motor. Retract to the rear end of the shell and temporarily retract the hole opening device.

After a certain period of time, after the hot metal has accumulated in the blast furnace, in order to pull out the gold rod driven into the tap hole, the retracted hole opening device is moved to the tap hole, and the drifter is fed by a feed motor. The gold rod shank is pushed forward into the chuck portion of the rod chucking jig, the rotation of the drifter is normally held, and the lug convex portion of the gold rod shank is aligned with the eccentric 90 ° groove in the chuck portion to engage the gold rod.
Next, pull the drifter backward with the feed motor to activate the reverse impact hammer (E) of the drifter and pull out the gold rod. When the gold rod begins to come off, stop the rotation of the drifter and stop the reverse impact hammer depending on how the gold rod comes out.
After that, the gold rod is pulled out by the feed motor. Simultaneously with the gold rod coming out of the tap hole, the hot metal in the blast furnace spouts into the gutter (J). The opening device promptly retracts to the retracted position. When all of the hot metal has been ejected, the opening is filled with the mat material, and one operation of taking out the hot metal is completed.

After the lapse of a certain time, when the hot metal is accumulated again in the blast furnace, the operation of taking out the hot metal is repeated according to the above sequence.

[0022]

[Effect] The rod chucking jig according to the present invention is suitable for the tap hole opening device of a large-sized blast furnace, has sufficient durability, and can efficiently perform the operation of taking out the hot metal from the blast furnace. However, it greatly contributes to the reduction of production cost. The features of the rod chucking jig according to the present invention include the following points.

1. Since the shank screw rod (power transmission shaft) is connected by using a two-divided bush, the looseness of the rod chucking jig does not occur at all even when the drifter is rotated in the reverse rotation and the forward and reverse impacts.

2. Since no connecting tool such as a chain or cotter is used, trouble due to damage or breakage is eliminated.

3. Since the lug convex portion and the eccentric 90 ° groove are fitted together, the conventional automatic attaching / detaching device for the gold rod can be applied as it is.

4. The taper of the lug convex part of the gold rod shank and the taper of the eccentric 90 ° groove are joined, and when pulling out the gold rod shank, the taper of the lug convex part is engaged and pulled out, so there is less wear. When pulled, the gold bar shank is located closer to the center of the chuck, which has the advantage of stable pulling out.

5. The gold rod shank can be used any number of times until the lug projections wear out.

6. Since it is not an eccentric structure, stable opening work can be performed.

7. Since the mechanism is simplified, the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a diagram showing a taphole opening operation.

FIG. 2 is a sectional view of a rod chucking jig according to the present invention.

3 is a cross-sectional view taken along the line XX in FIG.

FIG. 4 is a sectional view taken along the line YY in FIG.

FIG. 5 is a side view of a gold rod shank.

[Explanation of symbols]

A ・ ・ Rod chucking jig B ・ ・ Drifter C ・ ・ Rotating motor D ・ ・ Direct impact hammer E ・ ・ Reverse impact hammer F ・ ・ Lifting motor G ・ ・ Feed motor H ・ ・ Blast furnace J ・ ・ Ohiga K ・・ Outlet port 1 ・ ・ Clamp nut 2 ・ ・ Split bushing 2 ・ ・ Lock washer 4 ・ ・ Shanks screw rod 5 ・ ・ Guide socket fitting 6 ・ ・ Ring 7 ・ ・ Chuck part 8 ・ ・ Guide groove 9 ・ ・Eccentric 90 ° groove 10 ・ ・ Taper 11 ・ ・ Gold bar shank 12 ・ ・ Lug convex 13 ・ ・ Taper 14 ・ ・ Gold bar 15 ・ ・ Prevention of hot metal jumping

Claims (3)

[Scope of utility model registration request] 1. A rod chucking jig for a tap hole opening device of a blast furnace, wherein a screw for fitting a shank squeeze rod (4) to the outer circumference and inner circumference of one end of the jig. The clamp nut (1) is cut around the outer circumference of the clamp nut (1) and is screwed together with the two-piece bush (2) sandwiched between the clamp nut (1) and the gold rod shank (11). 7) A rod chucking jig for a tap hole opening device, characterized by being formed. 2. The chuck part (7) has a guide groove (8) leading to an eccentric 90 ° groove (9) for mounting a gold rod shank (11), and an inlet side of the eccentric 90 ° groove (9). 2. A rod chucking jig for a taphole opening device according to claim 1, wherein a taper (10) matching the taper (13) of the lug protrusion (12) of the gold rod shank (11) is formed on the rod chucking device. Ingredient 3. The taphole according to claim 1 or 2, wherein the other end of the jig is a guide socket metal fitting (5) welded to a one-piece structure using a ring (6). Rod chucking jig for opening device.