JPH0459964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling liquid cutoff device for a steel bar rolling mill.

[Prior Art] Conventionally, in order to prevent troubles due to heat from the rolled material, a large amount of cooling liquid such as roll cooling water is sprayed onto the roll surface of a rolling mill to cool the roll. Therefore, roll cooling water is scattered around the rolls, and the scattered cooling water is collected in scale sluices (grooves) provided at the bottom of the rolling line.

Moreover, in order to obtain rolling information from the rolled material, sensors are installed between the rolling mills to measure and monitor the temperature, dimensions, flaws, etc. of the rolled material.

[Problems to be Solved by the Invention] Incidentally, the sensor installed in the above-mentioned rolling line requires the extreme removal of water, scale, etc. due to the sensor's principle, structure, etc. In other words, when a disturbance such as water or scale enters the detection part of the sensor,
The detection accuracy of the sensor becomes extremely poor, and in some cases, detection may become impossible. For example, in a sensor that measures the hot dimensions of a rolled material, if disturbances such as water or scale enter the sensor, the lens of the detection section will be flawed and the detection section will be damaged.

Therefore, the installation position of the sensor in a conventional rolling line needs to be selected at a position where there is least disturbance from water, scale, etc. (for example, in the center between the rolling mills or at a position sufficiently far from the rolling mill). It is necessary to take measures to prevent external disturbances at the entrance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling liquid cutoff device for a steel bar rolling mill that allows a sensor to be installed even in the immediate vicinity of the rolling mill.

[Means for Solving the Problems] The present invention provides cooling liquid supplied to the rolling rolls by
A cooling liquid cutoff device for a steel bar rolling mill that cuts off a sensor placed on the rear side of the rolling mill, and is configured by connecting an inlet guide located on the rolling mill side and a guide guide located on the sensor side. A guide tube for the rolled material to be rolled is placed between the rolling machine and the sensor, and a purge hole is provided at the inlet guide tip of the guide tube to discharge the cooling liquid that has entered the guide tube. At the joint between the pipe entrance guide and the guidance guide,
A high-pressure air jet nozzle for pushing the infiltrated cooling liquid into the purge hole is provided, and a gap is formed between the inner surface of the guide pipe and the rolled material at the rear end of the guide guide of the guide pipe. It is equipped with guide rollers.

[Action] According to the present invention, there are the following effects.

A guide tube for the rolled material is arranged between the rolling mill and the sensor by connecting an inlet guide located on the rolling mill side and a guide guide located on the sensor side. Since a purge hole is provided and a high-pressure air jet nozzle is installed at the rear end of the guide guide, high-pressure air can eliminate disturbances such as the cooling liquid that scatters around the rolling rolls and enters the guide tube, and the scale that gets caught in the cooling liquid. This makes it possible to discharge the liquid to the outside through the purge hole, and these disturbances do not affect the sensor forming part.

Since guide rollers are arranged to form a gap between the inner surface of the guide tube and the rolled material, a gap can be reliably formed around the entire circumference of the rolled material that has entered the guide tube to serve as a path for purging the rolled material. All disturbances brought into the guide pipe by the material can be reliably discharged to the outside from the gap through the discharge port by the high-pressure air.

In addition, if guide rollers are not provided, there will be a region where the material to be rolled slides into contact with the inner surface of the guide tube without a gap, and as a result, high pressure air cannot be circulated around the entire circumference of the material to be rolled. It is not possible to reliably discharge all of the disturbance brought into the guide tube by the rolled material.

[Example] In FIG. 3, a rolling mill 2 is arranged on a rolling line 1, and a mill guide 3 is clamped at an inlet and an outlet of the rolling mill 2 by a known mechanism.
A sensor 4 is provided downstream of the mill guide 3 on the outlet side, and control equipment such as a looper equipment is arranged downstream of the sensor 4.

1 and 2 are explanatory diagrams showing the mill guide 3. FIG.

Inlet guide 6 with circular cross section in FIG.
One end of the rolling mill 2 is arranged so as to be substantially in contact with the roll 7 of the rolling mill 2 . At the tip of the inlet guide 6, purge holes 6A are radially provided as discharge ports for purging a cooling liquid such as cooling water and disturbances such as scale. The inner and outer diameter portions of the rear end of the inlet guide 6 are provided with threaded surfaces, and the inner nozzle 8 is disposed on the inner diameter side. The end surface of the inner nozzle 8 protrudes rearward from the rear end surface of the inlet guide 6.

On the other hand, the guide guide 9 also has a circular cross section, and the inner and outer diameter portions of the end surface on the roll side also have a circular cross section.
It has a threaded surface similar to that of the inlet guide 6, and an inner nozzle 10 is provided on the threaded part on the inner diameter side.
is located. The end surface of the inner nozzle 10 projects forward from the tip surface of the guide guide 9.

On the other hand, a guide roller 9A is arranged at the rear end of the guide guide 9.
A is rotatable with the movement of the material to be rolled, and is configured to form a gap between the inner surface of the guide guide 9 and the material to be rolled.

Further, a connecting nut 12 having a high-pressure air introduction hole 11 is fitted to the outer diameter side threaded surfaces of the entrance guide 6 and the guiding guide 9.
are connected. Here, inner nozzle 8,1
0, the inlet guide 6, the guiding guide 9 and the connecting nut 12 form an air chamber 13 under their combined state, and the inner nozzles 8, 10 have their conical chamfers indicated by angle θ in FIG. The gap between the opposing sides has an angle θ with respect to the advancing direction of the rolled material.
This forms a nozzle part that can inject high-pressure air in a conical shape. The high pressure air ejection gap between the inner nozzles 8 and 10 can be adjusted by adjusting the connecting nut 12. Note that lock nuts are provided on both sides of the connecting nut 12 to prevent the connecting nut 12 from loosening due to vibrations of the rolled material during rolling.

The above-mentioned entrance guide 6, guide guide 9, and their connecting nut 12 form a first guide pipe 15, and this first guide pipe 15 is incorporated into the guide box 16A by the surrounding stay bar 16 and the connector 17. In this state, it is clamped to the rolling mill 2.
Note that even if the diameter of the rolling roll 7 changes, the first guide tube 15 and the guide box 16A are arranged in the first guide tube 15 and the guide box 16A.
Adjustment intervals of the dimensions shown by l in FIG. 1 are set so that 5 can be arranged.

On the other hand, the entrance guide 19 at the sensor entrance has a guide part that is widened on the entrance side in order to smoothly guide the rolled material, and fixed pieces 20 as shown in FIG. is welded and can be attached to a support base 21 placed on the guide box 16A with bolts or the like. Note that it is necessary to provide the support stand 21 at a position having an appropriate distance from the end surface of the first guide tube 15. Further, the inlet guide 19 and the outlet guide 22 are provided with an inner nozzle 8, which forms a nozzle portion similar to that in the first guide pipe 15.
10 and a connecting nut 12 are connected. Further, an O-ring groove 23 is provided on the outer diameter side of the end surface of the exit guide 22, and an O-ring 24 is mounted in the groove.

That is, the above-mentioned inlet guide 19, outlet guide 22, inner nozzles 8, 10, and connecting nut 12 form a second guide pipe 25. Second
The guide pipe 25 uses the opening of the inlet guide 19 as an outlet for purging disturbances such as cooling water and scale, and uses the opposing interval between the inner nozzles 8 and 10 as a high-pressure air jetting nozzle. Note that a sealing plate 26 that closely contacts the side surface of the sensor is fitted into the O-ring 24 attached to the rear end of the second guide tube 25.
In addition to reliably preventing the intrusion of disturbances, it also aims to prevent vibrations from the rolled material.

Next, the operation of the above embodiment will be explained. In this embodiment, on the roll surface of the rolling mill 2,
Roll cooling water is injected as a cooling liquid, and there is a lot of water scattered around the mill guide 3. For this reason,
Water enters the inside of the first guide pipe 15 of the mill guide 3. Therefore, when the material to be rolled passes through the first guide pipe 15, roll cooling water is guided into the first guide pipe 15 and generated scale is brought into the first guide pipe 15. Under such circumstances, when the material to be rolled is not inside the first guide pipe 15, high pressure air is injected in a conical shape from the high pressure air jet nozzle provided in the middle of the first guide pipe 15, and cooling water etc. Disturbances are purged externally from the roll nip of the rolling mill. Moreover, when the material to be rolled enters the inside of the first guide pipe 15, the disturbance is purged to the outside through the purge hole 6A provided at the tip of the first guide pipe 15 (on the rolling mill roll side), but there is a particularly important point. This means that the guide roller 9A that supports the material to be rolled forms a gap between the material to be rolled and the inner diameter surface of the guiding guide 9, so that disturbances can be reliably purged to the outside. That is, the guide guide 9 and the first guide tube 1
It is possible to reliably form a gap that serves as a path for purging disturbances around the entire circumference of the rolled material that has entered the rolling material. Purge hole 6A
can be reliably discharged outside. Furthermore, scale generated from the rolled material caused by sliding between the guide roller and the rolled material is caused by negative pressure at the guide roller (negative pressure is created by the jetting of high-pressure air from the high-pressure air jetting nozzle). The gas is sucked in from the air and purged to the outside through the purge hole 6A in the same manner as described above.

Further, the second guide pipe 25 provided on the downstream side of the first guide pipe 15 uses the same purging method as the high-pressure air jet nozzle of the first guide pipe 15 to supply cooling water to the inside of the sensor located downstream. This makes it possible to prevent disturbances such as In addition, the second guide pipe 25 can remove disturbances scattered around the outer circumference of the first guide pipe 15 and can prevent vibrations from being transmitted from the rolled material to the sensor.

As described above, according to the above embodiment, the guide pipes 15 and 25 of the mill guide 3 can prevent disturbances from entering into the guide path of the rolled material, and can also prevent disturbances from entering the surrounding area. This will cut off the transmission of vibration to the sensor. Therefore, it is possible to improve the detection accuracy of the sensor, prevent damage to the sensor, and install the sensor directly near the exit side of the rolling mill, making it possible to eliminate restrictions on the sensor installation location. Become.

[Effects of the Invention] As described above, according to the present invention, the sensor can be reliably protected from disturbances when the sensor is installed in close proximity to the rolling mill.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a plan view of FIG. 1, and FIG. 3 is a layout diagram showing an example of a rolling line to which the present invention is applied. 2...Rolling mill, 4...Sensor, 6...Inlet guide, 7...Roll, 6A...Purge hole, 8, 10
...Inner nozzle, 9...Induction guide, 9A...
... Guide roller, 11 ... High pressure air introduction hole (high pressure air jet nozzle), 15 ... First guide pipe, 25
...Second guide tube.

Claims (1)

[Claims] 1 A coolant cutoff device for a steel bar rolling mill that cuts off the coolant supplied to the rolling rolls from a sensor placed on the rear surface of the rolling mill, which includes an inlet guide located on the side of the rolling mill and a side of the sensor. A guide tube for the rolled material is arranged between the rolling machine and the sensor, and a guide tube for the rolled material is connected to a guide located at A high-pressure air jet nozzle is provided at the connection portion between the inlet guide of the guide pipe and the guide guide to push the invading cooling liquid to the purge hole, and a high-pressure air jet nozzle is provided at the rear end of the guide guide of the guide pipe. A cooling liquid cutoff device for a steel bar rolling mill, characterized in that a guide roller for the material to be rolled is arranged to form a gap between the inner surface of the guide tube and the material to be rolled.