KR200251307Y1 - Sink roll bearing life and drive improving device in continuous molten plating bath - Google Patents

Abstract

The present invention relates to an apparatus for improving the life and driving of a sink roll in a continuous molten plating bath, and includes a sink roll supported by a roll frame and a plurality of collating rolls supported by a roll frame on the sink roll. In the continuous molten plating bath, which can be continuously melt plating on the surface of the strip winding the sink roll and the correcting roll, each extending from both ends of the sink roll through the side wall of the plating bath to the outside Form an external extension exposed each, and mount the sink roll shaft extension tube on the outside of the outer extension portion, install a sink roll shaft outer rolling bearing at the end of the outer extension, between the outer extension and the sink roll shaft extension tube An electromagnetic pump is installed above the sink roll shaft extension pipe for directing the molten metal flowing in the gap between the to the plating bath. The main focus is on the lifespan of the sink roll bearing in continuous molten plating bath and the device for improving driving.

Description

Sink roll bearing life and drive improving device in continuous molten plating bath

The present invention relates to a device for improving the life and driving of a sink roll bearing in a continuous molten plating bath. In particular, it prevents bearing wear of the sink roll driving a strip in a continuous molten plating bath, and also improves productivity and quality by extending a replacement cycle. A continuous molten plating bath sink roll bearing life and drive improving device that can contribute.

1 is a side cross-sectional view of various roll apparatuses disposed in a conventional hot dip plating tank 10 and a plating bath, in which a sink roll 3 and a correcting roll 4 are roll frames 9 in the plating bath 10. It is mounted in a state supported by. Meanwhile, the sink roll 3 and the correcting roll 4 are plated while the strip 1 is wound around. Moreover, the stabilizing roll sliding bearing 8 is attached to the end of the stabilizing roll 5, and the sink roll sliding bearing 6 is attached to the end of the sink roll 3.

Continuous molten plating of the metal sheet strip 1 enters the molten metal bath 2 in a state in which the strip 1 is clean and preheated in a reduction heating furnace, as shown in FIG. Change direction and reduce the vibration of the strip 1 by the correcting roll 4 and the stabilizing roll 5 to continue the close vertical progression. Sink roll bearings are generally sink roll sliding bearings 6 which cause severe wear by friction at high temperatures in molten metal. These sink roll bearings are sliding bearings made of corrosion and sleeves as heat and abrasion resistant materials, but in particular, the sink roll bearings that receive the entire line tension of the strip (1) are severely abrasion-resistant and have a long service life. It is about 10 days in the case of hot dip galvanizing bath. The sink roll bearing bushing causes loss of productivity due to bushing itself and construction after each replacement and downtime of about 8 hours. The wear of the bushing acts as a dross in the molten metal bath (2) of the wear metal powder, causing various surface defects on the surface of the molten plating, and deteriorating the quality. Also, the shaking of the strip (1) increases due to the wear of the bushing. It produces a nonuniform effect on the air wiping which is a process, and reduces the uniform quality of the coating amount.

In the prior art (German patent DE4439660A1; published 94.11.7, published 95.7.6), sliding bearings have been replaced with ball bearings to reduce wear of the sink roll sliding bearings 6, but various drosses, which are molten metals, especially intermetallic compounds, are used for ball bearings. It gets stuck in the gap, making it difficult to drive, and once it gets stuck, wear is also accelerated, so the lifespan improvement of the sink roll bearing 6 is not excellent.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus for improving the lifespan and driving of a sink roll bearing in a continuous molten plating bath that greatly improves the lifespan and driving of a sink roll by an electromagnetic pump and a rolling bearing.

The present invention for achieving the above object is a sink roll supported by a roll frame, and a plurality of corrugating rolls supported by a roll frame are installed in the plating bath, of the strip encircling the sink roll and the correcting roll In the process of performing continuous hot dip plating on the surface, external extension parts are respectively extended from both end portions of the sink roll to penetrate the side wall of the plating bath and are exposed to the outside, and a sink roll shaft extension pipe is formed outside the external extension part. A sink roll shaft outer rolling bearing at an end of the outer extension portion, and an electromagnetic pump for sending molten metal flowing in the gap between the outer extension portion and the sink roll shaft extension pipe to the plating bath; Continuous molten plating bath sink roll bearing life and drive improved length, characterized in that installed in the upper part of the extension pipe It is achieved by the.

1 is a side cross-sectional view of various roll apparatuses disposed in a conventional hot dip plating bath and a plating bath.

Figure 2 is a side cross-sectional view of the continuous molten plating bath sink roll shaft life and drive improved device according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: strip 2: molten metal bath

3: sink roll 4: corrector roll

5: stabilizing roll 6: sink roll sliding bearing

7: corrector roll sliding bearing 8: stabilizing roll sliding bearing

9: roll frame 10: plating bath

31: Sync roll shaft extension tube 32: Sync roll shaft extension tube

33: electromagnetic pump 61: sink roll shaft outer rolling bearing

2 is a side cross-sectional view of a continuous molten plating bath sink roll bearing life and drive improving device according to the present invention, the present arrangement is a sink roll shaft external extension portion 31, sink roll shaft extension tube 32, electromagnetic pump 33 and It is made by assembling the outer roll bearing 61 of the sink roll shaft.

The material of the sink roll shaft external extension 31 is selected as a material having a high permeability, and an extension tube 32 is formed between the extension and the wall of the plating bath 10 to surround the extension with a high permeability metal pipe.

Extension tube 32 should be thick to withstand the pressure of the molten metal, but if too thick, there is a loss of the magnetic line of the electromagnetic pump 33 is suitable if the thickness in the range of 5-15mm. Also, the space between the extension pipe 32 and the extension part 31 is sufficient to allow the flow of the molten metal to float freely, and if the space is too large, the capacity of the electromagnetic pump 33 to control the flow of the molten metal should be large, so that the interval is about 10 mm. Join In addition, the end of the extension pipe 32 is attached to a valve (not shown) which can be manually opened to suck air, and when the molten metal is pumped into the molten plating tank 10 by the electromagnetic pump 33, It is configured to be wrapped in close contact. The electromagnetic pump 33 is configured to be wrapped around the extension pipe 32 and should have a capacity of 50 to 1000 KVA when applying an alternating current of 60 Hz as a solenoid 400 × 2 electromagnetic pump. In case of 50 KVA or less, the pumping force is weak and the induction heating effect is low, so it is difficult to keep the molten metal in the molten state and to push it into the plating bath 10, and in the case of more than 1000 KVA, the induction heating effect is too large. The roll outside the sink roll bearing 61 extracts the molten metal to the level below the sink roll 3 for horizontal installation and horizontal replacement of the sink roll 3 with the sink roll outer extension 31. It is configured such that the opening and closing part is partially provided to allow horizontal access of the sink roll 3 on either the left or the right side of 10).

The molten metal is filled to the lower part of the sink roll 3 in the plating bath 10, and after opening the partial opening and closing door configured to allow horizontal movement of the sink roll 3 to one side of the plating tank 10, the first side of the sink roll shaft. Charge the sink roll 3 provided with the external extension 31, touch the opening and closing door, assemble the sink roll bearing 61, assemble the molten metal while assembling and running the next electromagnetic pump, and roll the upper rolls 4 and 5 After filling up, the continuous molten plating is carried out while the strip 1 is vertically advanced. At this time, in the shaft portion of the sink roll 3, the molten metal flows between the shaft outer extension portion 31 and the extension pipe 32, soaks into the rolling bearing 61 and tries to solidify at the same time, but flows under the operating state of the electromagnetic pump. The molten metal can not flow in and can prevent the solidification of the hot-dip metal (eg zinc, aluminum, lead, tin, etc.) by the induction heating effect of the electromagnetic pump. In this situation, when the strip 1 is vertically advanced by the line tension, the bearing part is rotated in the air without permeation of the molten metal by the rolling bearing, so the bearing marro is very small and thus semipermanent.

As described above, the present invention can be an economical hot dip plating process and can produce high quality hot dip plating products. In other words, the sink roll bearing is rolled bearing without molten metal so that wear is very small, high speed and almost semi-permanent, so the replacement cycle is increased to 6 months or more. Eliminates time-to-production and productivity losses, enables high-speed plating, and eliminates the bearing and construction costs associated with frequent replacements as in conventional sliding bearings. In addition, this device has very low rolling bearing wear, no entry into the dross in the plating bath of wear metal, no defects sucked into the plating surface, and less play by wear in the rolling bearing itself. In addition, the uniformity in the adhesion amount distribution due to air wiping of the hot dip plating layer is also greatly increased. In addition, the reduction of strip shaking reduces the strip dampening role load of the correcting rolls and the stabilizing rolls, which greatly increases the life of these rolls. In addition, the present device has an excellent effect of reducing the heat requirement for maintaining the high temperature of the molten metal by reducing the volume of the plating bath.

Claims (1)

A sink roll supported by a roll frame and a plurality of coring rolls supported by a roll frame on the top of the sink roll are installed in a plating bath, and the continuous hot dip plating is performed on the surface of the strip encircling the sink roll and the correcting roll. In the continuous molten plating tank which can be implemented, each extending from both ends of the sink roll penetrates the side wall of the plating tank to form an external extension to be exposed to the outside, and the sink roll shaft extension pipe on the outside of the outer extension portion A sink roll shaft outer rolling bearing at an end of the outer extension portion, and an electromagnetic pump for sending molten metal flowing in the gap between the outer extension portion and the sink roll shaft extension pipe to the plating bath; Sink roll bearing life and drive improving device in a continuous molten plating bath, characterized in that installed in the upper portion of the extension pipe.