JPH0634803U - Spray equipment for scale cleaning on tension levelers or scale breakers - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a scale leveling spray device for tension levelers for the purpose of descaling.
It is intended to prevent the scale from being caught between the work roll and the backup roll and prevent the scale from accumulating on the chock portion. [Structure] For a roll unit consisting of work rolls and multiple backup rolls, one horizontal flat spray spread in the longitudinal direction of the rolls, with one roll on each backup roll, and a vertical flat spray placed on each chock have the same header. The water sprayed by the horizontal spray forms a water curtain with the spray device provided in the above, and shields the drainage mixed with the scale after cleaning from flowing onto the backup roll. As a result, the drainage route is limited to the curtain-less chocks, and by combining the vertical spray spray with the chocks and pushing the wastewater in, the equipment has the function of preventing scale entrapment and accumulation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spray device for cleaning scales of tension levelers or scale breakers used for mechanical descaling of hot rolled steel sheets.

[0002]

[Prior art]

 Tension levelers or scale breakers used for mechanical descaling of hot-rolled steel sheets generally have a roll unit consisting of a work roll and multiple backup rolls, and the tension leveler or scale breaker uses a bridle roll for transporting the steel sheet before and after the tension leveler. By repeatedly bending the applied hot-rolled steel sheet with work rolls, the scale on the steel sheet surface is cracked and mechanical descaling is performed.

At this time, a plurality of spray nozzles are attached to the spray header in order to clean the scale that has peeled off, and a method of wrapping the spray width of each spray so that the cleaning water is applied to the entire length of the work roll, By spraying water toward the work roll or backup roll by a method that has a cylinder width of each backup roll or a spray jet width greater than the cylinder length width, the scale powder adhering to the roll is washed. It is a device (see, for example, Japanese Utility Model Publication No. 3-7045).

[0004]

[Problems to be solved by the device]

 In conventional spray equipment, the water drainage route after cleaning the scale adhering to the roll is not secured, so the water containing the scale peeled off due to descaling is applied to the roll unit, causing a gap between the work roll and the backup roll. When the scale is caught, roll scratches are generated, roll wear is accelerated, and scale accumulates on the chocks, and the scale gets caught in the rotary seal on the side of the backup roll, causing problems such as poor rotation of the backup roll. Has been the cause of. Therefore, the present invention provides a spray structure for the purpose of suppressing the scale bite between the work roll and the backup roll and preventing the scale buildup on the chock portion.

[0005]

[Means for Solving the Problems]

 The present invention is applied to a scale cleaning spray device for a tension leveler or scale breaker that has a roll unit that is used for mechanical descaling of hot-rolled steel sheets and that supports a work roll and a plurality of backup rolls divided in the width direction. For scale cleaning, one horizontal flat spray nozzle is provided facing each backup roll, and vertical flat spray nozzles are placed facing the chock portion between the backup rolls. The main point is the spray device.

The details of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of the present invention in a perspective view of one side of one roll unit, FIG. 2 shows a cross section AA of FIG. 1, and FIG. 3 shows details of a spray portion.

As shown in FIGS. 1 to 3, the present invention is a spray device for cleaning scale of a tension leveler or scale breaker having a roll unit 20 composed of a work roll 1 and a plurality of backup rolls 2 supporting the work roll 1. , The horizontal flat spray nozzles 4, 4 are provided so as to face the respective backup rolls 2, 2, ... And the vertical flat spray nozzles 5 are provided in the chocks 8, 8 ,. , 5, ... Are arranged facing each other. In the figure, 3 is a header, 7 is a horizontal water curtain, and 14 is a vertical water curtain.

[0008]

[Action]

 The scale cleaning water supplied through the header 3 to the roll unit 20 composed of the work roll 1 and the plurality of backup rolls 2 is the roll cleaning nozzle using the horizontal flat spray nozzle 4 arranged for each back-up roll 2. And a chock cleaning nozzle using a vertical flat spray nozzle 5 arranged for each chock 8 is sprayed toward the roll unit.

At this time, the water sprayed from the horizontal flat spray nozzle 4 spreads in a strip shape in the lengthwise direction of the roll and reaches the work roll 1 while forming a water curtain 7. The water reaching the work roll cleans the scale adhering to the work roll and becomes wastewater containing the scale. The drainage tends to flow on the backup roll due to its own weight, but due to the force of the jet of the water curtain 7 which is set to be large due to the weight of the drainage, it does not flow onto the backup roll 2 and becomes a break in the water curtain 7. Drained into 8 parts 9 times.

Further, the water sprayed by the vertical flat spray nozzle 5 for cleaning the chock becomes a vertical band, reaches the chock 8 while forming a water curtain, and cleans the scale accumulated on the chock, and at the same time, cleans the scale on both sides. The drainage 9 discharged from the backup roll is pushed to the rear side of the chock, which is an open space, to prevent the drainage 9 of the horizontal flat spray nozzle 4 for roll cleaning from interfering with each other.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the plan view of FIG. 4 (1), the side view of FIG. 4 (2), and FIG. 4 (3) showing an enlarged Z portion of this drawing.

The diameter of the work roll 1 is 80 mm, the diameter of the backup roll 2 is 140 mm, the distance between the center of the work roll and the center of the backup roll is 80 mm, the distance between the center of the work roll and the tip of the spray nozzle is 150 mm, and the water pressure is 2 kg / cm ² . In this case, in order to secure the drainage route and prevent the interference with the drainage by the adjacent spray nozzle, the injection width 1 of the horizontal flat spray nozzle 4 is 1 / L = 0.7 to the width L of the backup roll. Set in the range of 0.9.

If the flow rate Q of water jetted from the spray nozzle is too large, the drainage water of the adjacent neighbors interferes with each other, and if it is too small, the holding power of the water curtain 7 becomes small and the drainage water drops on the backup roll 2 and is expected. Since there is no shielding effect, Q = 3 to 5 l / min. Furthermore, the injection angle θ can be obtained by passing the tangent line of the backup roll 2 to obtain the largest injection angle due to the roll arrangement restrictions, and the force of the jet flow from the horizontal flat spray nozzle 4 necessary to support the dead weight of the drainage. Although it can be maximized, if the work roll cleaning surface 12 becomes too close to the contact point 11 between the work roll 1 and the steel plate 6, it will be drained to the bottom of the water carten 7, so that the cleaning water will be reflected above the center of the work roll. The angle is set in the range of θ = 20 to 30 °, which is upward.

Further, the flow rate of water jetted from the vertical flat spray nozzle 5 is set to be 1/2 or less of that of the horizontal flat spray nozzle 4, and the water from the nozzle 5 is scattered by reflection on the chock surface, so that the water is discharged to the chock portion. Preventing the inhibition of 9.

The movement of the peeled scale in such an embodiment is repeated by a work roll to be bent, and the peeled scale is washed away by the washing water spray and mixed into the washing water. Due to the shielding effect of the water container sprayed from each nozzle, the wastewater mixed with the scale does not fall on the backup roll and is discharged on the chocks, which are cuts in the water curtain.At the same time, the scale is also caught between the rolls. It is discharged without being inserted into the system.

Further, the cleaning water sprayed from the vertical flat spray nozzle for cleaning the chock discharges the scale without accumulating on the chock, which is an object of the present invention to prevent scale entrapment between rolls. Prevention of scale accumulation on the chock can be achieved.

[0017]

[Effect of device]

 The scale cleaning spray device of the present invention makes it possible to suppress the scale bite between the work roll and the backup roll, which was impossible with the conventional cleaning spray device, and thereby greatly reduce roll defects and rolls. It is possible to extend the service life, eliminate the scale accumulation on the chock part, and prevent accidents such as roll inversion.

[Brief description of drawings]

FIG. 1 is a schematic view of the present invention.

FIG. 2 is an explanatory view showing a cross section of FIG.

FIG. 3 is an explanatory diagram showing partial details of FIG.

FIG. 4 is an explanatory view of an embodiment of the present invention.

[Explanation of symbols]

 1 Work roll 2 Backup roll 3 Header 4 Roll cleaning nozzle 5 Chock cleaning nozzle 6 Steel plate 7 Water curtain 8 Chock 9 Drainage

Claims (1)

[Scope of utility model registration request] 1. A scale cleaning spray device for a tension leveler or scale breaker having a roll unit used for mechanical descaling of a hot rolled steel sheet and comprising a work roll and a plurality of back-up rolls supporting the work roll. One horizontal flat spray nozzle is provided to face one backup roll, and a vertical flat spray nozzle is placed to face the chocks between the backup rolls. .