JPH04127259U - Scraper for rolls in molten metal plating bath - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To remove the hard alloy layer that occurs on the surface of thermally sprayed rolls. Do not raise the temperature of the plating bath. [Configuration] Main body 1 that holds the scraper head 12
A heating mechanism 13 is provided inside the device. The heating mechanism 13 has a heating wire 13a, and heats the head 12 with its radiant heat. By pressing the heated head 12 against the surface of the roll in the bath, the roll surface is heated without increasing the bath temperature. The alloy layer on the surface of the roll is in a state where it is easy to remove, and is easily removed by scraping with the head 12.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on bath rotors such as sink rolls used in hot-dip metal plating baths. Regarding the scraper that is combined with the tool and removes the alloy layer adhering to its surface. Ru.

0002

[Conventional technology]

In continuous hot-dip metal plating, for example, continuous hot-dip galvanizing, the The slip that was placed in the bath changes direction along the sink roll placed in the bath, and A wiper pin is placed on the bath surface that goes out of the bath through a squeezing roll placed in the bath. The amount of zinc deposited is adjusted using the zinc nozzle.

0003 So-called in-bath rolls such as sink rolls and squeeze rolls placed in the plating bath , along with the wiping nozzle, is an important device that affects the quality of galvanized steel sheets. is well known. Therefore, various improvements and improvements have been made to bath rolls. Thermal spraying on the roll surface is one of the ways to improve zinc corrosion resistance. It is beginning to have a significant effect on improving the However, this thermal spraying, on the other hand, It has been found that this complicates the formation of a zinc alloy layer on the surface of the steel.

0004 The zinc alloy layer that forms on the surface of the roll in the bath can cause indentation marks on the steel plate and It has been known for a long time that this can cause coating unevenness and hinder the maintenance of the quality of the steel plate surface. A scraper has been used to remove it. The scraper is , the cutting edge is pressed against the surface of the bath roll, and as the bath roll rotates, the roll It scrapes off the alloy layer on the surface, and its improvements are progressing (for example, 53-137832, JP-A-61-139658, JP-A-61-1 33369, etc.).

[0005]

[Problem that the idea aims to solve] However, the alloy layer that forms on the sprayed roll surface is caused by minute particles on the roll surface. Cracks that occur directly on the roll surface and are generated due to the thermal spray material. It is significantly harder than the iron-zinc alloy layer. Therefore, the scraper alone cannot remove the alloy layer. could not be removed, and the temperature of the zinc bath was lowered from the normal operating temperature of 460°C to around 485°C. By raising the alloy layer from the roll surface, the alloy layer is easily removed and the screen is It is scraped off with a raper. However, such measures This may adversely affect quality, such as worsening of thirst, and may even damage the components immersed in the bath. Various negative effects such as reduced lifespan cannot be avoided.

[0006] The purpose of this invention is that the alloy layer formed on the sprayed roll surface also increases the bath temperature. Scratches can be removed more easily, and normal alloy layers can also be removed without any scratches. The objective is to provide a

[0007]

[Means to solve the problem]

The scraper of this invention scrapes the surface of a roll in a hot-dip metal plating bath. A scraper scrapes off the adhering alloy layer as the bath roll rotates. The blade is characterized by being equipped with a heating mechanism that forcibly heats at least the cutting edge portion.

[0008]

[Effect]

Bringing the forcibly heated blade edge of the scraper into contact with the surface of the roll in the bath. As a result, even when the bath temperature is maintained at a normal level, the alloy layer that adheres to the roll surface is It is heated above the bath temperature and becomes easily removed from the roll surface. And removed The alloy layer that has become easily scraped off is easily scraped off by the cutting edge.

[0009]

【Example】

Embodiments of the present invention will be described below based on the drawings. Figure 1 shows an example of the present invention. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a front view of the scraper. FIG. 3 is a side view showing how the par is used.

0010 As shown in FIGS. 1 and 2, the scraper 10 includes a flat main body 11 and A head 12 attached to the tip of the head 12 and a heating mechanism 13 for heating the head 12 are provided. ing.

[0011] The main body 11 is hollow inside except for the proximal end, and the space is open toward the distal end. It is. Holding brackets 14, 14 are attached to the base end surface of the main body 11. ing.

0012 The head 12 includes a scraping part 12a having a wedge-shaped cross section and a flat plate protruding from the base end surface of the scraping part 12a. It consists of a heat absorbing part 12b having a shape. The scraping portion 12a has a shape protruding toward the tip side of the main body 11. In this state, it is fixed to the distal end surface of the main body 11 by welding or the like, thereby forming a cutting edge portion. endothermic The portion 12b is inserted into the internal space of the main body 11 and is radiantly heated by the heating mechanism 13. It will be done.

[0013] The heating mechanism 13 has a plurality of heating wires 13a arranged along the inner surface of the main body 11. do. The heating wires 13a are arranged in parallel at intervals in the width direction of the main body 11. Fixed to the inner surface of the main body 11 with a support 13b so as not to contact the heat absorbing part 12b of 2. has been done. The heating wire 13a has a wiring 1 inserted through the base end of the main body 11. 3c is connected, and a power source is connected via wiring 13c.

[0014] The material for the main body 11 is, for example, a Zn bath-resistant material such as SUS316L. The head 12 is made of a material that has high thermal conductivity, such as copper, and It is soft. Further, as the material of the heating wire 13a, for example, carbon may be used. can be mentioned.

[0015] Such a scraper 10 continuously scrapes a strip 20 as shown in FIG. Used in galvanizing equipment for hot-dip galvanizing. The strip 20 is an inclined strip. It penetrates into the zinc bath 50 in the bathtub 40 through the naut 30, and the synchronizer installed in the bath After changing direction with the roll 60, it passes through the squeezing roll 70 and advances out of the bath.

[0016] The scraper 10 is attached to a cylinder 80 attached to the upper surface of the snout 30. It is raised and lowered along its upper surface. Then, the synchronizer that rotates the head 12 The heating wire of the heating mechanism 13 is pressed against the surface of the heating mechanism 13 over the entire length in the axial direction. 13a generates heat. As a result, the heat absorbing portion 12b of the head 12 is connected to the heating wire 13a. It is heated by receiving radiant heat from the scrapers, and the heat is transmitted to the scraping portion 12a. As a result, scraping Even if heat 12c becomes high temperature (for example, 600℃) and the bath temperature is 460℃, the synchronization The surface of the roll 60 is heated to a temperature higher than the bath temperature, and the alloy layer adhering to the surface is heated to the surface of the roll. This makes it easy to remove from. Therefore, even if the roll surface has been thermally sprayed, The alloy layer is easily scraped off by the scraping portion 12a of the head 12.

[0017] Additionally, the temperature of the zinc bath 50 is controlled to about 460°C, which is suitable for plating. As a result, quality deterioration due to insufficient drying of zinc, etc., and various devices immersed in the zinc bath 50, Deterioration of component life is prevented. The flat heat absorbing portion 12b of the head 12 is connected to the heating wire 1. The radiant heat from 3a is efficiently absorbed on its wide surface and transmitted to the scraping part 12a.

[0018] Note that the above embodiment is configured to heat the cutting edge portion of the scraper 10. However, the entire scraper 10 may be heated. However, zinc bath 5 In actual operation, it is desirable to heat only the cutting edge to avoid unnecessary heating. This is also advantageous in terms of heating costs.

[0019]

[Effect of the idea]

As is clear from the above explanation, the scraper of the present invention has at least its blade. Equipped with a heating mechanism that heats the tip, the heated blade tip forcibly heats the roll surface. Therefore, the hard alloy layer that forms on the sprayed roll surface can be removed only by the scraper. There is no need to raise the bath temperature. Therefore, the plating quality decreases as the bath temperature increases. Various adverse effects such as deterioration do not occur.

[Brief explanation of the drawing]

FIG. 1 is a front view of a scraper according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA in FIG. 1;

FIG. 3 is a side view showing the scraper in use.

[Explanation of symbols]

10 scraper 11 Main body 12 head 13 Heating mechanism 13a Heating wire

Claims (1)

[Scope of utility model registration request] Claim 1: A scraper that scrapes off an alloy layer adhering to the surface of a roll in a bath that is immersed in a hot-dip metal plating bath as the roll in the bath rotates, is provided with a heating mechanism that forcibly heats at least the cutting edge portion. A scraper device for rolls in a molten metal plating bath, characterized by: