JPS5925525Y2 - Cooling and driving device for vertical rolls in universal rolling mills - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling and driving device for vertical rolls in a universal rolling mill.

Conventionally, in universal rolling mills for rolling section steel such as H-section steel, the vertical rolls are usually not driven, and the vertical rolls are driven by horizontal rolls on the driven side through the rolled material. There is.

Recently, a vertical roll drive system has been considered in order to solve the inconveniences of such driven vertical rolls, but there are problems with the size of the equipment, ease of reassembly work, and speed between horizontal and vertical rolls. The drive method for vertical rolls also has its drawbacks, such as the difficulty of matching, so it is more common to apply only rotational force to the vertical rolls using pressurized water. It has been put into practical use.

By the way, in normal universal rolling mills, pressure water is used for roll cooling, and is only needed when the roll is biting material and immediately after that, and the pressure water that flows out at other times is Water is not used effectively.

Now, to explain the structure of a conventional universal rolling mill, in a conventional universal rolling mill of horizontal roll drive type and vertical roll driven type, as shown in Fig. 1, a material 1 to be rolled such as H-beam steel is rolled. When rolling, only the upper and lower horizontal rolls 2, 3 are driven, and the vertical roll 4 is driven by the horizontal roll 2.3 via the material 1 to be rolled.

The horizontal rolls 2, 3 are provided with bearing chocks 5, which can be raised and lowered by a drive device (not shown) provided in the housing 10, and the horizontal rolls 2, 3 are provided with joints 7, 8 and spindles. The rotational force is transmitted via a drive device (not shown) through 9.

Similarly, the vertical roll 4 is also provided with a chock 6, and the chock 6 has a structure that can be adjusted left and right with respect to the housing 10, but the vertical roll 4 itself is driven by the movement of the material to be rolled. It is configured to rotate in a driven manner.

The structure of the chock 6 of the vertical roll 4 in the above conventional example is shown in FIG.
2 is a bearing.

Further, a chock cover 13 is provided to prevent the tip of the rolled material 1 from entering the chock 6.

Considering the situation in which the material to be rolled gets caught between the rolls in such a universal rolling mill, the horizontal rolls 2,
3 generally has a larger diameter than the vertical rolls 4, so the material to be rolled 1 is first bitten between the horizontal rolls 2 and 3, and then the stationary vertical roll 4 changes the circumferential speed of the horizontal rolls 2 and 3. The material to be rolled 1 at a speed equivalent to that is hit.

Then, during a very short period of time, the vertical roll 4, which has large inertia and frictional torque, suddenly increases its speed from a stationary state to a biting speed, so a large shearing force acts between the rolled material 1 and the vertical roll 4. The tip of the material to be rolled 1 is sheared and peeled off, and the peeled pieces end up adhering to the surface of the vertical rolls 4.

If such a phenomenon occurs, it will have a serious adverse effect on the surface of the rolled product, resulting in the generation of rejected products and work-in-progress products.

Therefore, some proposals have been made to solve the above-mentioned problems by directly driving the vertical rolls.
If a mechanical drive is considered, the drive motor and other equipment will be large-scale, the reassembly work will be complicated, and it will be difficult to match the speeds of horizontal rolls and vertical rolls, making it impractical. I can't say that.

A drive system that is considered to be more practical than this drive system uses pressurized water to rotate vertical rolls, softening the impact of biting the rolled material into the rolling mill, and There are systems that attempt to apply a driving force that does not affect the processing of the material in any way, but even with this type of hydraulic drive system, the time during which water pressure contributes to driving the vertical rolls is limited to
Only the time required for accelerating the vertical rolls before the spread material is bitten is required, and the pressure water is not used effectively at other times.

Therefore, there are disadvantages in that pressurized water is wasted and extra driving force is required.

Also, when considering the vertical roll cooling function of the cooling water, as shown in Figure 3, the temperature of the vertical roll is plotted on the vertical axis.
When time is expressed on the horizontal axis, pressure water hardly contributes to cooling during the period indicated by time A in the figure, and for this reason, even if the flow of pressurized water at this time A is stopped, there is no problem. Rather, it can be seen that the result is that unnecessary driving force is required.

The present invention was developed to solve the above-mentioned drawbacks of the conventional technology, and is a universal rolling mill that can soften the impact force when material is bitten into the vertical rolls of a universal rolling mill, and can effectively utilize roll cooling water at all times. The purpose is to provide a cooling and driving device for vertical rolls.

The cooling and driving device for the vertical rolls of the universal rolling mill of the present invention is provided with blades on the outer surface of the vertical rolls, and a driving nozzle is placed opposite the blades, and is cooled by facing the roll surface of the vertical rolls. Each nozzle is connected to a pipeline that supplies pressure fluid, and the pipeline is provided with a switching valve that selectively communicates the pipeline with each nozzle. A valve driving section is provided which operates to selectively supply pressure fluid by switching to the cooling nozzle side when the roll is biting and switching to the driving nozzle side when the roll is not biting.

According to the above configuration, the switching valve is operated by the valve drive unit based on the position of the material to be rolled with respect to the vertical roll, and the pressure fluid is injected from either the cooling nozzle or the driving nozzle.

In other words, when the material to be rolled is bitten by the vertical roll and the temperature of the vertical roll surface is high, pressure fluid is sprayed onto the vertical roll surface from the cooling nozzle to cool it down.
When the material to be rolled is removed from the vertical roll, that is, while the temperature of the surface of the vertical roll is low, pressure fluid is sprayed from the drive nozzle onto the blades to drive the vertical whirl, and the vertical roll of the material to be rolled continues. Alleviates the impact that occurs when biting into the body.

Hereinafter, the present invention will be further explained according to the embodiments shown in the drawings.

Figure 4 shows H rolled by a universal rolling mill applying this invention.
FIG. 2 is a cross-sectional view showing a state in which a rolled material 1 made of shaped steel is being rolled.

This universal rolling mill has upper and lower horizontal rolls 2, 3 and a pair of vertical rolls 4, 4 arranged on both sides of the rolled material 1, as in the case of a normal rolling mill. It is rotatably supported via a bear tongue 12.12 (see FIG. 5) provided within the chock 6.

A ring-shaped bearing holder 14.14 rotatable together with the outer race is fitted into the upper end of the outer race of the bearing 12.12, and these bearing holders 14.14 are fixed to the vertical roll 4 by bolts 17. ing.

Furthermore, a large number of vanes 15 are fixed to the outer periphery of the bearing presser 14.14, extending in a radial direction with respect to the axis of the vertical roll 4 (see FIG. 6).

Further, in the chock 6 of the vertical roll 4, the above-mentioned blade 1 is provided.
5, that is, in the tangential direction to the outer butt surface of the vertical roll 4, one or more driving nozzles 16 are provided, and as shown in FIG. Pressure fluid is supplied from a suitable pressure fluid source (not shown) via a pipe 22, a switching valve 23, and a branch pipe 19.

Similarly, in the chock 6 of the vertical roll 4, there is one or more chocks that inject pressure fluid toward the surface of the vertical roll 4, that is, in a direction perpendicular to the outer peripheral surface of the vertical roll 4. A cooling nozzle 20 is provided, and this cooling nozzle 20 receives pressure fluid from the same pressure fluid source as the pressure fluid source for the drive nozzle 16 via the pipe 22, the switching valve 23, and the branch pipe 21. is being supplied.

The switching valve 23 has a function of switching the pressure fluid supplied through the pipe 22 to a branch pipe 21 leading to a cooling nozzle 20 for cooling vertical rolls and a branch pipe 19 leading to a driving nozzle 16 for driving vertical rolls. It fulfills the following.

The switching valve 23 detects the position of the material to be rolled 1 with respect to the rolling mill 26, as shown in FIG. 7, and performs a switching operation based on a command from a valve driving section (not shown) based on this position signal.

In this embodiment, a photocell is used as a means for detecting the rolled material.

That is, in this embodiment, the position of the material to be rolled 1 is detected by a photocell and the switching valve 23 is switched. When the photocell 24 detects the position of the material to be rolled 1, the branch pipe 19 is closed and the branch pipe 21 is closed. is opened (see FIG. 6a), and the pressure fluid from the pipe 22 is transferred to the branch pipe 21.
The liquid is then sprayed in a direction perpendicular to the surface of the vertical roll 4 through the cooling nozzle 20, and is used for cooling the vertical roll 4.

On the other hand, when the photocell 25 detects the rolled material 1, the switching valve 23 is switched so that the branch pipe 21 is closed and the branch pipe 19 is opened. The air is then injected onto the blades 15 of the vertical roll 4 in the tangential direction of the vertical roll 4, and is used to drive the vertical roll 4.

The installation position of the photocell 24 is very close to the front of the universal rolling mill 26, as shown in FIG. Preferably, the distance from the rear surface of the universal rolling mill 26 is adjustable to adjust the cooling time so that the pressure fluid is injected until the surface drops to a constant temperature, and if the cooling time is too long and the vertical rolls 4 are driven. If sufficient rotational force cannot be obtained for
By shortening the zero operation time, the cooling time of the vertical roll 4 can be shortened and the rotational force can be increased.

When the pressure fluid is switched between cooling and driving the vertical rolls as in this embodiment, the pressure fluid is always effectively used for cooling the rolls and driving the rolls, as shown in Figure 8. This is very advantageous from the viewpoint of energy saving.

In the above embodiment, the case where the pressure fluid supply pipe is branched into two systems, one for cooling the vertical rolls and the other for driving, is explained, but it is of course possible to branch out into many more pipes to effectively utilize the pressure fluid. It is.

As explained above, according to the present invention, the impact force when the material to be rolled is bitten by the vertical rolls in a universal rolling mill is alleviated, and the tip of the material to be rolled is caused to shear and peel due to the impact, resulting in peeled pieces. It is possible to eliminate defects such as those that adhere to the surface of vertical rolls and cause deterioration in the quality of rolled products.

In addition, since the present invention does not mechanically drive the vertical rolls, the driving force for the vertical rolls only needs to be as small as that required for their idle rotation, making the equipment more compact, and the work of changing rolls can be done using the conventional vertical roll non-driving method. It is done in the same way.

Further, according to the present invention, the pressure fluid for cooling the rolls when the rolled material is not caught in the rolls can be effectively used for driving the rolls, so it is extremely beneficial from the viewpoint of energy saving.

[Brief explanation of the drawing]

Figure 1 is a front view showing an example of a conventional universal rolling mill, Figure 2 is a diagram showing the structure of a conventional chock for vertical rolls, Figure 3 is a diagram showing the operating performance of a conventional universal rolling mill, FIG. 4 is a cross-sectional view showing an example of a universal rolling mill to which the vertical roll cooling and driving device of the present invention is applied; FIG. 5 is a cross-sectional view showing a chock for the vertical rolls of the universal rolling mill of FIG. 4; 6A and 6B are a schematic cross-sectional view and a plan view, respectively, of the vertical roll cooling and driving device according to the present invention, FIG. 7 is a schematic diagram showing the operating device of the switching valve according to the present invention, and FIG. It is a figure showing operational performance. 1... Material to be rolled, 2... Horizontal roll,
3...Horizontal roll, 4...Vertical roll, 5...Bearing chock, 6...
Vertical roll chock, 15... Feather, 16.
... Drive nozzle, 19 ... Branch pipe, 20 ... Cooling nozzle, 21 ... Branch pipe, 22 ... Pipe, 23・・・・・・
Switching valve, 24...Photocell, 25...
Photocell, 26...Universal rolling mill.

Claims (1)

[Scope of utility model registration request] A blade is provided on the outer surface of the vertical roll, a driving nozzle is arranged opposite to the blade, and a cooling nozzle is arranged opposite to the roll surface of the vertical roll, and each of the nozzles supplies pressurized fluid. A switching valve connected to the pipeline and selectively communicating between the pipeline and each nozzle is provided in the pipeline, and this switching valve is switched to the cooling nozzle side when the roll of the material to be rolled is bitten, and the switching valve is switched to the cooling nozzle side when the roll is not bitten. 1. A cooling and driving device for vertical rolls of a universal rolling mill, comprising a valve drive section that is operated to selectively supply pressure fluid by switching to the driving nozzle side at times.