JPH0683762U - Scraper device for hot dip sink roll - Google Patents

Abstract

(57) [Abstract] [Purpose] A simple scraping device is used to efficiently remove deposits adhering to the sink roll without vibrating the scrape blade or sink roll. [Structure] A line connecting a support point P of the scraping blade 5 and a rotation center point O of the sink roll 4 is defined as a boundary line L, and the scraper blade 5 is positioned at a position downstream of the boundary line L in the rotation direction of the sink roll. While contacting, at least the tip of the scrape blade 5 is arranged to be inclined in the rotation direction of the sink roll 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a scraper equipped with a scrape blade for removing deposits such as dross and metal layers adhering to the surface of a sink roll disposed in a hot dip bath in a continuous hot dip coating line in a dipped state. Regarding the device.

[0002]

[Prior art]

 Generally, the steel strip M used for hot dip plating is introduced into the plating bath 3 after passing through the continuous furnace 1 and the snout 2, as shown in FIG. The steel strip M is guided upward from the plating bath 3 by being turned upside down by the sink roll 4 arranged in the plating bath 3 in a dipped state.

In this plating bath, Fe ions eluted from the steel strip M used for continuous hot dip plating react with plating components present in the plating bath to form a dross alloy. This dross alloy may adhere to the surface of the sink roll 4, or may be sandwiched between the steel strip M and transferred to the steel strip M to cause an indentation flaw, which may cause deterioration of the product quality. . In order to prevent this obstacle, it has been conventionally practiced to scrape off the adhered matter on the surface of the sink roll 4 with the scrape blade 5.

As a method or an apparatus for effectively removing deposits on a sink roll using a scrape blade, for example, the following is disclosed. JP-A-53-137832; A method in which the crown of a dipping roll (sink roll) is divided into a plurality of axial positions, and the entire width of the dipping roll is scraped by a plurality of scraping blades having shapes corresponding to the respective portions.

Japanese Laid-Open Patent Publication No. 61-133369; A torque sensor detects a pressing force of a doctor blade (scrape blade) against a roll in a bath, and a doctor blade driving device is controlled based on the detected value to detect the doctor blade. A method of adjusting the pressing force of the blade to an appropriate value.

[0006] Japanese Utility Model Laid-Open No. 61-164268: A narrow wiper blade (scrape blade) is rotatably installed along the surface of the sink roll, and the wiper blade is pressed against the surface of the sink roll. A device that removes the deposits on the sink roll surface by moving in the width direction of the roll.

[0007]

[Problems to be solved by the device]

 In each of the above-mentioned conventional methods and apparatuses, the shape of the sink roll is taken into consideration, and the deposit is removed according to the shape. However, in these methods and devices, for example, the method requires multiple scraping blades, the method uses a torque sensor, and the mechanism or device to be used is considerably complicated. . On the other hand, there is a problem that not only the stability of long-term operation is lacking, but also the mechanism or the device is complicated, so that a lot of labor is required for its maintenance.

Further, in the conventional operation including the above-mentioned conventional technique, in order to improve the removal efficiency when removing the adhered matter, as shown in FIG. 12, the adhered matter is disposed at a position facing the rotation of the sink roll 4. Was scraping. That is, since scraping is performed at a position facing the rotation direction of the sync roll 4, it causes scratches on the sync roll 4 by the scrape blade 5, and vibration is generated on both the sync roll 4 and the scrape blade 5. It was also a cause of As shown in detail in FIG. 13, the scraping blade 5 is supported by a blade supporting member 13 fixed to a frame 14 in an inserted state, and is advanced by turning a handle 5a of the head. It can move back and forth, and the contact pressure on the sink roll 4 can be adjusted. A buffer spring 6 is interposed between the blade support member 13 and the intermediate protruding portion 5b of the scrape blade 5.

When vibrations occur in both the sink roll 4 and the scrape blade 5, a gap is created between the two, which hinders the adhered substance removal efficiency. Moreover, only a part of the scrape blade 5 comes into contact with the sink roll, which causes uneven wear of the scrape blade 5. In addition, the vibration of the sink roll causes a problem that the plating applied to the steel strip M is also hindered.

Therefore, a main object of the present invention is to provide a scraper device having a simple structure and capable of efficiently removing the adhering matter adhering to the sink roll while suppressing the vibration of the scrape blade or the sink roll as much as possible.

[0011]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a scraper device for scraping off surface deposits of a sink roll arranged in a hot dip bath in a state of being scraped by a scraping blade whose tip contacts the surface of the sink roll. The line connecting the support point of the scraping blade and the center of rotation of the sink roll is taken as a boundary line, and the scraping blade comes into contact with the position downstream of the boundary line in the direction of rotation of the sink roll, and The point is that at least the tip of the blade is arranged so as to be inclined in the direction of rotation of the sink roll.

Further, in this case, an intersection angle between a line connecting the support point of the scrape blade and the rotation center point of the sink roll and a line connecting the scrape blade contact point and the sink roll rotation center point is 0 to 45. It is desirable to be in the range of °.

[0013]

[Action]

 Hereinafter, the operation and effect of the present invention will be described in detail in comparison with a conventional scrape blade. First, the vibration generating mechanism in the case of the conventional scrape blade will be considered based on FIG. In the conventional case, the scrape blades 5A and 5B are arranged so as to face each other in the rotation direction of the sink roll. Therefore, the case of the scraping blade 5A will be described. The tangential force F generated by friction and catching with the sink roll 4 and collision with surface deposits is in a relationship of facing the supporting point of the scraping blade 5A. . The force F acts as an axial compressive force on the scrape blade 5A as it is, and the direction of the scrape blade 5A is arranged so as to face the rotation direction of the sink roll 4, and therefore, at the contact point T thereof. There is no escape area (restraint continues). Therefore, the scrape blade 5A pushed by the sink roll 4 is pushed up in the F direction and is supported by the spring 6 shown in FIG. Then, it is considered that the scraper blade 5A is vibrated by being pushed back by the spring 6 at a certain stage.

[0014] In the case of the illustrated scrape blade 5B, occurred vibration by the same mechanism by the component force F _P of the support points the direction of Sukurepubure over de 5B tangential force F, moreover component force F _S Acts so as to press the tip of the scraping blade 5B against the sink roll 4, and the contact point T completely loses the escape area. Therefore, a more remarkable vibration phenomenon is observed than in the case of the scraping blade 5A.

By the way, according to the present invention, as shown in FIG. 9, a line connecting the support point P of the scrape blade 5C and the rotation center point O of the sink roll 4 is defined as a boundary line L, and this boundary line L When the scraper blade 5C is configured to come into contact with the downstream side position in the direction of rotation of the sink roll, the component force F _P of the tangential force F is not in a relationship of facing the support point P, but is applied to the scraper blade 5C. On the other hand, it acts as a tensile force, and the component force F _S of the tangential force F acts so as to separate the scrape blade 5C from the sink roll 4. Therefore, in the scrape blade 5C, the contact point T portion is not continuously restrained, and the tangential force F 1 is successively lost, so that the vibration is suppressed. It should be noted that, in the above, when the scrape blade acts as a compressive force, the vibration becomes large because the force is applied at the contact point T, which causes an eccentric load on the cross section and causes bending of the member. This is because when the energy is released, it becomes easy to vibrate. On the other hand, when acting as a tensile force, vibration is unlikely to occur even if the bending is small and the strain energy is released.

Further, even if the scrape blade comes into contact with a position downstream of the boundary line L in the rotation direction of the sink roll, for example, as shown in FIG. 10, the tangent line of the contact point T and the contact direction line of the scrape blade 5D. When the angle α formed by and exceeds 90 °, the component force F _P of the tangential force F acts in the direction of pressing the scrape blade 5D against the sink roll 4, so comparing with the conventional case, Even if the vibration can be remarkably suppressed, it is not very preferable from the viewpoint of restraining the contact point. Therefore, in the present invention, the vibration suppressing effect is further enhanced by adding the configuration in which at least the tip of the scrape blade is arranged to be inclined (α <90 °) in the rotation direction of the sink roll.

[0017]

【Example】

 Hereinafter, the effects of the present invention will be specifically described with reference to examples. [Example 1] First, a test was conducted on how the contact portion of the tip of the blade behaves depending on the positional relationship between the sink roll and the scrape blade.

As shown in FIG. 6, the test uses a pressing member 11 having rotating rollers 11A and 11B at both end portions and a roll 12 that is like a sink roll. The roll 12 was rotated in the forward and reverse directions of a and b shown in FIG. 7 while applying a constant pressing force so as to make contact with each other. In this case, the a rotation direction is the conventional scraping blade arrangement mode and the b rotation direction is the scraping blade arrangement mode of the present invention.

As a result of the above experiment, when the roll 12 rotates in the direction a (conventional mode), the pressing member 11 is biased to one side, and only one of the rotating rollers 11A or 11B rotates. occured. On the other hand, when the roll 12 rotates in the direction of b (a mode of the present invention), both the rotation rollers 11A and 11B of the pressing member 11 are in stable contact with the surface of the roll 12 and the left and right rotation rollers 11A and 11B. Both turned in the same way.

From the above test results, when the rotating rollers 11A and 11B are considered as scraping blades, a line connecting the support point P of the scraping blade and the rotation center point O of the roller 12 is defined as a boundary line L, and the boundary line L If it is brought into contact with a position on the downstream side in the direction of rotation of the sink roll from L, it is presumed that the contact is stable.

Example 2 Next, in the continuous hot-dip galvanizing line shown in FIG. 11, a comparative experiment was conducted to remove deposits of sink rolls with the scraping blade according to the present invention and the conventional scraping blade. The sink roll used in the experiment has a diameter of 650 mm, a barrel length of 1600 mm, and a scrape blade width direction length of 1700 mm. Under these conditions, a steel strip having an average strip thickness of 1.10 mm and an average strip width of 1020 mm has an average strip running speed of 90 m / m.
It was driven in for 10 days.

First, as shown in FIG. 1, when the scrape blade 5 is arranged according to the configuration of the present invention, as a result of investigating the removal performance of deposits, vibration is suppressed and deposits can be removed efficiently. did it. Further, an intersection angle α between a line L connecting the support point P of the scrape blade 5 and the rotation center point O of the sink roll 4 and a line S connecting the contact point T of the scrape blade and the sink roll rotation center O. When the angle was 0 to 45 °, the deposits could be removed particularly well. In this case, it is most effective that the above-mentioned θ is 10 to 25 °.

On the other hand, when the test was carried out as the installation mode (conventional example) shown in FIG. 12, vibration resulted and defects were generated on the plating surface.

On the other hand, when a blade-shaped blade as shown in FIG. 10 was used, some vibration occurred and the scraping effect was slightly inferior to that in FIG. 1, but in this case Even in that case, a sufficient removing effect is achieved as compared with the case of the conventional example.

Even in the case where the scrape blade 5E has a bent shape as shown in FIG. 4, the scrape blade 5E is in contact with a position downstream of the boundary line L in the direction of rotation of the sink roll, and the scrape blade 5E The effect of the present invention can be sufficiently obtained if at least the tip of the above is inclined with respect to the rotation direction of the sink roll 4. Further, as shown in FIG. 5, even when the intersection angle θ between the boundary line L and the line S is close to 90 °, the scrape blade 5F bent in an L shape is used and the pressing means is used. A similar removing effect can be obtained by using the spring 15 and the like together.

[0026]

[Effect of device]

 As described above in detail, according to the present invention, it is possible to efficiently remove the deposits attached to the sink roll by a simple scraping device without vibrating the scraping blade or the sink roll.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of a scraper device according to the present invention.

FIG. 2 is a diagram showing a contact relationship between a sink roll and a scrape blade.

FIG. 3 is an enlarged view of a contact portion between a sink roll and a scrape blade.

FIG. 4 is a view showing a modified example of the scrape blade.

FIG. 5 is a diagram showing another modification of the scrape blade.

6 is a front view of the device used in Example 1. FIG.

FIG. 7 is a side view of FIG.

FIG. 8 is a view for explaining the operation of the present invention.

FIG. 9 is a view for explaining the operation of the present invention.

FIG. 10 is a view for explaining the operation of the present invention.

FIG. 11 is a schematic view of a continuous hot dip plating line.

FIG. 12 is a diagram showing a positional relationship between a conventional sink roll and a scrape blade.

FIG. 13 is a sectional view showing the structure of a support portion of the scrape blade.

[Explanation of symbols]

1 ... Continuous furnace, 2 ... Snout, 3 ... Plating bath, 4 ... Sink roll, 5 ... Scrape blade, M ... Steel strip

Claims (2)

[Scope of utility model registration request] 1. A scraper device for scraping and removing surface deposits of a sink roll disposed in a hot dip bath in a state of being immersed, by a scrape blade whose tip contacts the surface of the sink roll. A line connecting a point and the center of rotation of the sink roll is used as a boundary line, and the scrape blade comes into contact with the downstream side position of the sink roll in the rotation direction from the boundary line, and at least the tip of the scrape blade is a sink. A scraper device for hot dip sink rolls, wherein the scraper device is arranged so as to be inclined in the rotation direction of the roll. 2. A crossing angle between a line connecting a support point of the scrape blade and a center of rotation of the sink roll and a line connecting a contact point of the scrape blade and a center of rotation of the sink roll is in the range of 0 to 45 °. The scraper device for a hot-dip galvanized sink roll according to claim 1.