JP2012180552A - Rotating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily rotation balance-adjustable rotating body which has a hollow ceramic-made barrel part having an axial center, and an axial part disposed concentrically with the barrel part and extending from both ends of the barrel part to an axial direction.SOLUTION: The rotating body has a hollow ceramic-made barrel part 1a having an axial center, and an axial part 1h disposed concentrically with the barrel part and extending from both ends of the barrel part to the axial direction. The rotating body has an annular interpolated member 3 disposed and interpolated in the hollow part of the barrel part, and a recessed part or through-hole is provided at the edge of the interpolated member 3.

Description

  The present invention relates to a rotating body having a hollow ceramic body and a shaft disposed coaxially with the body and extending in the axial direction from both ends of the body.

  As a rotating body related to the above technical field, there is a roll for a molten metal plating bath that is used by being immersed in a molten metal plating bath such as zinc or aluminum in a production line of a plated steel sheet. A sink roll or a support roll that realizes high corrosion resistance, heat resistance, and wear resistance with respect to a molten metal plating bath by forming a body portion and a shaft portion, and rolls for a molten metal plating bath are disclosed in Patent Documents 1 and 2 below. Proposed in In order to clarify the problems of the prior art, a roll for a molten metal plating bath that is a rotating body will be described below as an example, but the present invention is not limited to a roll for a molten metal plating bath.

  The roll for molten metal plating bath disclosed in Patent Document 1 is “excellent in corrosion resistance, heat resistance and wear resistance, and is easy to rotate by reducing the weight of the roll, and can prevent cracking when the roll is lifted from the bath. It is configured to solve the problem that the whole can be made longer with ceramics. “The roll body and shaft are each formed in a hollow shape with ceramics, and the shaft is formed at both ends of the roll body. It is a roll for continuous molten metal plating used by being immersed in a molten metal bath characterized by being joined.

  Moreover, the roll for hot metal plating disclosed in Patent Document 2 is configured to solve the problem of “preventing the roll shaft portion from coming off from the roll body portion during use”. The hollow roll shaft portion is passed through the hollow portion of the non-rotating flange member for preventing the body portion and the roll shaft portion from slipping and slipping, and the outer peripheral portion of the flange member is formed hollow by ceramics. It is a roll for continuous molten metal plating, characterized in that the rolled body is fitted.

JP 2001-89836 A Japanese Patent Application Laid-Open No. 2005-289839

  Here, in the molten metal plating bath roll that is in direct contact with the steel plate in the molten metal plating bath, a uniform plating layer is formed on the surface of the steel plate so that there is no defect, so that the amount of vibration generated during rotation is below a predetermined level. It is necessary to have a certain rotational balance. However, the body portion made of the ceramic of the roll for hot metal plating bath disclosed in Patent Documents 1 and 2 may be bent during the sintering, and the roll of the hot metal plating bath roll in which the body portion is incorporated. The present inventors have perceived that adjusting the rotational balance may be necessary depending on the operating conditions.

  In addition to the above-described molten metal plating bath roll, in a rotating body such as a roll roller or other rotating body, it is necessary to adjust the rotational balance when it is required that the vibration during rotation be a predetermined level. When the body portion is a metal rotating body, it is well known to adjust the rotational balance by screwing or welding a metal weight (balance weight) to, for example, the side surface of the body portion. However, in the case of a rotating body whose body is made of ceramics, it is difficult to place a weight body on the body itself, since not only welding but also machining of female threads on the body will be the starting point of destruction. It is.

  The present invention has been made by the present inventors in the light of the above-mentioned problems of the prior art, and is arranged in a hollow ceramic body having an axial center and coaxially with the body. In addition, an object of the present invention is to provide a rotator that can easily adjust the rotation balance in a rotator having shaft portions extending in the axial direction from both ends of the body portion.

  One aspect of the present invention that solves the above problems includes a hollow ceramic body having an axis, and a shaft that is disposed coaxially with the body and extends in the axial direction from both ends of the body. A rotating body having a plate-like or annular insertion member that is disposed in the hollow portion of the trunk portion and that is inserted into the hollow portion of the trunk portion; The rotating body is provided with holes. In addition, it replaces with a recessed part or a through-hole, and the weight body may be arrange | positioned at the insertion member.

  The insertion member is made of ceramics having a thermal expansion coefficient substantially the same as that of the body portion in the use atmosphere, and is desirably fitted and fixed in the hollow portion of the body portion.

  Furthermore, when the insertion member is inserted and fixed in the hollow portion of the body portion, it is desirable that a part of the outer periphery of the insertion member has a convex shape in the radial direction. Further, the insertion member may be fitted and fixed to the hollow portion of the trunk portion through an elastic member that is in close contact with the inner peripheral surface of the trunk portion, and a step portion is formed on the inner surface of the trunk portion. The insertion member may be fitted and fixed in the large diameter portion of the stepped portion.

  Furthermore, it is preferable that the insertion member is fixed to the hollow portion of the trunk portion by shrink fitting.

  In addition, it is preferable that the shape of the outer peripheral edge of the insertion member viewed from the axial direction is a substantially circular shape, and the outer peripheral surface of the insertion member is disposed so as to be in close contact with the inner peripheral surface of the body portion.

  When the insertion member is inserted and fixed in the hollow portion of the trunk portion, a substantially annular groove is formed on the inner peripheral surface of the trunk portion, and the insertion member is parallel to the axis. A first insertion member having a flat surface and being inserted into a part of the groove portion in a state where the outer peripheral surface of the insertion member is in close contact with the inner peripheral surface of the groove portion of the trunk portion; and one of the first insertion members And a second insertion member that is inserted into the other part of the groove part in a state in which the outer peripheral surface is in close contact with the inner peripheral surface of the groove part. The first insertion member and the second insertion member may have a pressing portion that presses against the inner peripheral surface of the groove portion.

  More preferably, a plurality of recesses, through-holes or weights are arranged on the same circumference around the axis of the trunk.

  The insertion member has a hollow shaft portion and can be disposed in at least one hollow portion of the shaft portion instead of the body portion, and at the maximum stress generation position of the body portion or the shaft portion when the rotating body is used. Can be arranged. Furthermore, the shaft portion is constituted by a hollow first shaft portion disposed at one end of the body portion and a hollow second shaft portion disposed at the other end, and an insertion member is provided. It can arrange | position to at least one of a 1st axial part or a 2nd axial part.

  Furthermore, the body portion is configured by at least a hollow first body portion and a second body portion having the same outer diameter as that of the first body portion and having a hollow shape, and the second body portion is configured by the first body portion. The first body member and the second body member are arranged coaxially with the body portion of the first body portion so that one end surface thereof is opposed to the one end surface of the first body portion. It is possible to arrange so as to include both of the opposite one end faces.

  The insertion member has a substantially cylindrical large-diameter portion whose outer peripheral surface is in close contact with the inner peripheral surface of the trunk portion or the shaft portion, and a substantially disk-shaped thin-wall portion whose thickness in the axial direction is thinner than the large-diameter portion. And it is preferable to comprise so that a thin part may be connected to the internal peripheral surface of a large diameter part.

  The rotating body is a roll for a molten metal plating bath, and the insertion member preferably has a groove portion formed on the outer peripheral surface thereof and extending in the axial direction, and both ends of the groove portion are opened.

  The rotating body is a molten metal plating bath roll, and a buoyancy adjusting weight is preferably disposed in the through hole portion of the annular insertion member.

  The rotating body is a roll for a molten metal plating bath, and the plate-like insertion member is disposed on the body or the shaft so as to seal the inside of the body, and the inside of the body is for adjusting buoyancy. It is desirable that a weight is disposed. When at least one of the first shaft portion and the second shaft portion extending from both ends of the body portion is a solid substantially columnar shape and the other is a substantially cylindrical shape, the other is a plate-like insertion. Arrange the members. Furthermore, it is desirable that the buoyancy adjusting weight is a fluid that flows along the inner peripheral surface of the body portion as the body portion rotates.

  According to the present invention, the problem can be solved.

It is a schematic block diagram of a plated steel plate production line. It is a figure which shows the structure of the molten metal plating bath apparatus of FIG. It is a figure which shows the roll for hot metal plating baths of FIG. It is the elements on larger scale of the roll for hot metal plating baths of FIG. It is a figure which shows the 1st modification of the roll for hot metal plating baths of FIG. It is a figure which shows the 2nd modification of the roll for hot metal plating baths of FIG. It is a figure which shows the 3rd modification of the roll for hot metal plating baths of FIG. It is a figure which shows the 4th modification of the roll for hot metal plating baths of FIG. It is a figure which shows the 5th and 6th modification of the roll for hot metal plating baths of FIG. It is a figure which shows the 7th modification of the roll for hot metal plating baths of FIG.

  Hereinafter, the present invention will be described with reference to the drawings on the basis of a roll for a molten metal plating bath and modified examples thereof. In the following description, a roll for a molten metal plating bath will be described as an example of a rotating body, but the present invention is used in a rotating body for high-speed rotation applications because it is used in, for example, a high temperature atmosphere, a corrosive atmosphere, or other harsh environments. In order to reduce the weight of the rotating body or to maintain the dimensional accuracy of the body portion with respect to the temperature change in the use atmosphere, it is possible to apply it to a roll roller or other rotating body having at least the body portion made of ceramics. Furthermore, each element of the present invention described below can be used singly or in appropriate combination, and can be appropriately modified and used without departing from the gist of the present invention.

[Plating steel plate production line, hot metal plating equipment]
First, a molten metal plating apparatus according to the present invention (hereinafter, simply referred to as “roll”) is immersed in a molten metal plating bath and used, and the molten metal plating apparatus is incorporated. The plated steel sheet production line will be described with reference to FIGS.

  As shown in FIG. 1, the plated steel sheet production line pre-treats the steel sheet P drawn from a hot-rolled pickling coil or a cold-rolled coil mounted on a payoff reel (not shown), and performs an annealing process to adjust the material. Then, the steel plate is immersed in a molten metal plating bath to form a steel plate P1 on which a molten metal made of zinc, aluminum, or an alloy thereof is adhered, and then the adhered molten metal is cooled and solidified by cooling the steel plate P1. The steel plate P1, which has been subjected to post-treatment such as chemical conversion treatment, is then wound around a tension reel through a skin pass rolling mill or a tension leveler, and shipped.

FIG. 2 is a cross-sectional view seen from the front showing a schematic configuration of a molten metal plating apparatus 80 for performing molten metal plating in FIG. The molten metal plating apparatus 80 is immersed in a bath 82 containing a molten metal plating bath (hereinafter sometimes simply referred to as “plating bath”) 81 and a surface layer portion of the plating bath 81, and is immersed in the plating bath 81. Snout 83 for preventing oxidation of the steel sheet to be introduced, sink roll 1 arranged in plating bath 81, and a pair of support rolls 6 and 7 positioned above sink roll 1 in plating bath 81 And a gas wiping nozzle 86 positioned slightly above the surface of the plating bath 81. An external driving force is not applied to the sink roll 1 itself, and the sink roll 1 is driven by contact with the moving steel plate. In addition, the support rolls 6 and 7 are usually provided with an external motor (
The other support roll 7 is a non-drive roll. The support roll 6 may be a non-driving type in which no external driving force is applied. The sink roll 1 and the pair of support rolls 6 and 7 which are hot metal plating bath rolls are rotatably supported by bearings 87 and 88 attached to the frames 84 and 85, respectively. Soaked in.

The steel plate P enters the plating bath 81 from the oblique direction through the snout 83 and is changed in the traveling direction upward via the sink roll 1. The steel plate P rising in the plating bath 81 is sandwiched between the pair of support rolls 6 and 7 so that the pass line is maintained and warpage and vibration are prevented. The gas wiping nozzle 86 sprays a high-speed gas onto the steel plate P <b> 1 coming out from the plating bath 81. The thickness of the molten metal plating adhering to the steel plate P1 is uniformly adjusted by the gas pressure and spray angle of the high-speed gas. Thus, the steel plate P1 to which the molten metal plating was applied
Is obtained.

[Sink Roll]
The configuration of the sink roll 1 incorporated in the plating apparatus 80 of FIG. 2 will be described with reference to FIG. 3 which is a sectional view seen from the front and FIG. 4 which is an enlarged sectional view of FIG. The same applies to the configurations of the following first to seventh modifications, but basically the configuration described using the sink roll as an example can also be applied to the support roll, and the configuration described using the support roll as an example. Can also be applied to sink rolls.

  As shown in FIGS. 3 and 4, the sink roll 1 includes a hollow ceramic body 1a having an axis I serving as a rotation center, and is disposed coaxially with the body 1a and from both ends of the body 1a. It has a shaft portion 1h extending in the axial direction as a basic configuration, and has a plate-like insertion member 3 that is inserted into the hollow portion of the barrel portion 1a so that the end surface intersects the axis I of the barrel portion 1a. is doing. And in the sink roll 1 of this aspect, the intermediate part 1c which couple | bonds the trunk | drum 1a and the axial part 1h which is a preferable element in the case of a comparatively large diameter is arrange | positioned. Needless to say, the present invention includes the case where the intermediate portion 1c is not interposed between the both end portions of the body portion 1a and the shaft portion 1h. Since the structure of the two intermediate portions 1c and the shaft portion 1h arranged at both ends of the body portion 1a and the relationship between them and the body portion 1a are the same, only the intermediate portion 1c and the shaft portion 1h on the left side of the figure will be described. The description of the right intermediate portion 1c and the shaft portion 1h is omitted.

[Body]
The ceramic body 1a of the present embodiment in which the outer peripheral surface is processed to have a predetermined outer diameter has a substantially circular recess 1b formed at both ends, and one formed at the center in the axial direction. The step portion 1k includes a large-diameter surface 1L that is an inner peripheral surface formed by inner surface processing from the left end of the body portion 1a and a small-diameter surface 1m that is a non-processed sintered surface. And an alignment surface 1n extending in a direction orthogonal to the axial center I connecting the large diameter surface 1L and the small diameter surface 1m (hereinafter sometimes referred to as a radial direction). In addition, since the sink roll 1 which is a roll for a molten metal plating bath is rapidly heated and rapidly cooled at the time of immersion in the plating bath and at the time of pulling up, excessive stress is generated when the temperature distribution between the surface and the inside is different. Since there is a possibility of breakage, it is preferable to form a hollow shape having a certain thickness in the radial direction as shown in the figure.

[Middle part]
The substantially annular intermediate portion 1c fitted and fixed in the recess 1b formed at both ends of the body portion 1a is made of ceramics like the body portion 1a, and has a large diameter penetrating in the axial direction. In addition to having a through-hole portion in the center, it has a small-diameter through-hole portion 1d penetrating in the axial direction formed between the inner peripheral surface and the outer peripheral surface in the radial direction. As shown in FIG. 4C, the through-hole portion 1d is formed at an equal angle around the axis at a 45 ° pitch, and forms a recess 3c or a through-hole 3b of the insertion member 3 to be described later. When the sink roll 1 is immersed in the plating bath, molten metal is smoothly introduced into the sink roll 1 to prevent breakage due to thermal shock of the sink roll 1, and the sink roll 1 is further removed from the plating bath. In the case of taking out from the molten metal, it also functions to smoothly discharge the molten metal that has entered the inside to the outside and prevent the molten metal from solidifying inside. In addition, by introducing molten metal into the hollow portion of the sink roll 1 through the through-hole portion 1d, the air inside the sink roll 1 is discharged, so that it rises due to buoyancy and contacts the bearing with excessive force and wear. Progress can be suppressed. In addition, the structure of the through-hole part 1d is not limited to the illustration which is a preferable aspect, You may provide the through-hole part 1d of a different hole diameter, and the angle pitch which arrange | positions the through-hole part 1d needs to be the same. There is no need to provide them on the same circumference. Further, in order to further smoothly introduce and discharge the molten metal, the through-hole portion 1d of the other intermediate portion 1c is displaced with respect to the through-hole portion 1d of one intermediate portion 1c when viewed from the axial direction. In order to more smoothly introduce and discharge molten metal, a plurality of groove portions extending in the axial direction are formed on the outer peripheral surface of the intermediate portion 1c. When the intermediate portion 1c is fitted and fixed in the concave portion 1b of the trunk portion 1a, the through-hole portion 1d may be configured by the inner peripheral surface of the concave portion 1b and the groove portion.

[Shaft]
The shaft portion 1h of the present embodiment is formed in a hollow shape with ceramics similarly to the body portion 1a and the intermediate portion 1c, and is a large-diameter portion 1e that is fitted and fixed in a through-hole portion formed at the center of the intermediate portion 1c. And a small diameter portion 1g having a sliding surface supported by the bearing 87 and sliding, and a connecting portion 1f connecting the large diameter portion 1e and the small diameter portion 1g. Here, if there is an acute angle portion, it becomes a starting point of destruction. Therefore, the coupling portion of the connecting portion 1f, the large diameter portion 1e, and the small diameter portion 1g is formed with a smooth curve in a sectional view along the axial direction. . In FIG. 3, reference numeral 1 i denotes a thrust receiver that supports the sink roll 1 in the axial direction. The thrust receiver 1i made of ceramics is fitted and fixed to the end opening of the small diameter portion 1g, and is configured so that the area in contact with the bearing 87 is reduced in consideration of the rotation of the sink roll 1. The cross-sectional view along the radial direction of the left end surface has an arc shape that is convex in the left direction.

[Material composition]
Hereinafter, before description of the insertion member 3, the body 1 a, the intermediate portion 1 c, the shaft 1 h, and ceramics that are materials constituting the insertion member 3 will be described. In the rotating body according to the present invention, it is inevitably only the body portion 1a that needs to be ceramic, and the intermediate portion 1c, the shaft portion 1c, and the insertion member 3 are made of, for example, metal or resin. However, in the case of a rotating body that is used in a high-temperature atmosphere or a corrosive atmosphere, such as a sink roll or a support roll that is a roll for a molten metal plating bath, all members may be composed of ceramics. This is preferable in order to prevent the rotating body from being damaged or worn during use.

  Ceramics include alumina, zirconia, silica and other oxide ceramics, zirconium boride, titanium boride, boron boride, depending on the thermal shock resistance and corrosion resistance required by the operating conditions of the rotating body and other operating conditions. Other boride-based ceramics, silicon carbide / boron carbide, other carbide-based ceramics, or inorganic materials such as carbon may be used. And since the roll for molten metal plating baths of this aspect is rapidly heated and rapidly cooled when immersed in the plating bath and taken out, it needs to be excellent in thermal shock resistance. Therefore, as the ceramics constituting the roll for the molten metal plating bath, silicon nitride / aluminum nitride and other nitride-based ceramics having high thermal conductivity are preferable, and high resistance to erosion and wear against the molten metal which is the plating bath. Particularly preferred are silicon nitride ceramics having excellent high temperature strength. Hereinafter, although silicon nitride ceramics suitable for constituting a roll for a molten metal plating bath will be described in detail, the silicon nitride ceramics themselves may be the same as those described in JP-A-2001-335368.

  Aluminum and oxygen present in the silicon nitride ceramic serve as a phonon scattering source and reduce the thermal conductivity. Silicon nitride ceramics are composed of silicon nitride particles and surrounding grain boundary phases, and aluminum and oxygen are contained in these phases. Since aluminum has an ionic radius close to that of silicon, it easily dissolves in silicon nitride particles. Due to the solid solution of aluminum, the thermal conductivity of the silicon nitride particles themselves is lowered, and the thermal conductivity of the silicon nitride ceramics is significantly lowered. Therefore, the aluminum content in the silicon nitride ceramics must be minimized.

  Most of the oxygen in the oxide added as a sintering aid is present in the grain boundary phase. In order to achieve high thermal conductivity of silicon nitride ceramics, it is necessary to reduce the amount of grain boundary phase having lower thermal conductivity than silicon nitride particles. The lower limit of the addition amount of the sintering aid is such an amount that a sintered body having a relative density of 8.5% or more can be obtained. It is necessary to reduce the amount of oxygen in the grain boundary phase by making the addition amount of the sintering aid as small as possible within this range.

When silicon nitride powder with a small amount of oxygen is used as a raw material, the amount of oxygen in the grain boundary phase can be reduced, so the amount of grain boundary phase itself can be reduced, and high thermal conductivity of the sintered body can be achieved. It becomes difficult to sinter due to a decrease in the amount of SiO ₂ produced in the process. However, when MgO, which is superior in sinterability to other oxides, is used as a sintering aid, the amount of sintering aid added can be reduced and a dense sintered body can be obtained. As a result, the thermal conductivity of the sintered body is dramatically increased.

  Examples of sintering aids that can be added together with magnesium include Group 3 of the periodic table such as Y, La, Ce, Nd, Pm, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu (described later). Is mentioned. Among these, Y, La, Ce, Gd, Dy, and Yb are preferable in that the sintering temperature and pressure do not become too high.

  The thermal conductivity at normal temperature of the silicon nitride ceramic used in the present invention is 50 W / (m · K) or more, more preferably 60 W / (m · K) or more. Accordingly, the oxygen content in the silicon nitride ceramic is 5% by weight or less to obtain a thermal conductivity of 50 W / (m · K) or more, and a thermal conductivity of 60 W / (m · K) or more. Is 3% by weight or less. The oxygen content in the silicon nitride particles is 2.5% by weight or less for obtaining a thermal conductivity of 50 W / (m · K) or more, and a thermal conductivity of 60 W / (m · K) or more. Is 1.5% by weight or less. Furthermore, the aluminum content in the silicon nitride ceramic is 0.2% by weight or less for obtaining a thermal conductivity of 50 W / (m · K) or more, and a thermal conductivity of 60 W / (m · K) or more. Is 0.1% by weight or less.

Magnesium MgO equivalent in silicon nitride ceramics)
The total amount of Group 3 element oxides in the periodic table is preferably 0.6 to 7% by weight. When the total amount is less than 0.6% by weight, the relative density of the sintered body is less than 95%, which is insufficient. On the other hand, if it exceeds 7% by weight, the amount of the grain boundary phase having a low thermal conductivity becomes excessive, and the thermal conductivity of the sintered body becomes less than 50 W / (m · K). MgO +
The Group 3 element oxide is more preferably 0.6 to 4% by weight.

The weight ratio of MgO / Group 3 element oxide is preferably 1 to 70, more preferably 1 to 10, and most preferably 1 to 5. MgO /
When the Group 3 element oxide is less than 1, the ratio of the rare earth oxide in the grain boundary phase is too large, and the sintering becomes difficult to obtain and a dense sintered body cannot be obtained. On the other hand, if the MgO / Group 3 element oxide exceeds 70, diffusion of Mg during sintering cannot be suppressed, and color unevenness occurs on the surface of the sintered body. M _g O / IIIA ₂ O ₃
Is in the range of 1 to 70, the thermal conductivity is remarkably increased by sintering at 1650 to 1850 ° C. When the sintered body is heat-treated at 1800 to 2000 ° C., the thermal conductivity is further increased. The increase in thermal conductivity by heat treatment is due to the growth of silicon nitride particles and volatilization of MgO having a high vapor pressure.

  The total amount of aluminum, magnesium and Group 3 elements of the periodic table in the silicon nitride particles is preferably 1.0% by weight or less.

  Of the β-type silicon nitride particles in the silicon nitride sintered body, when the proportion of β-type silicon nitride particles having a minor axis diameter of 5 μm or more exceeds 10% by volume, the thermal conductivity of the sintered body is improved. Since the coarse particles introduced into the film act as a starting point of fracture, the fracture strength is remarkably lowered, and a bending strength of 700 Mpa or more cannot be obtained. Therefore, the ratio of β-type silicon nitride particles having a minor axis diameter of 5 μm or more in the β-type silicon nitride particles in the silicon nitride sintered body is preferably 10% by volume or less. Similarly, the β-type silicon nitride particles preferably have an aspect ratio of 15 or less in order to prevent the coarse particles introduced into the structure from acting as a starting point of fracture.

The silicon nitride ceramic that forms the body portion 1a in the sink roll 1 needs to have sufficient resistance to rapid temperature changes. The resistance to sudden temperature changes is the following formula (1):
R = αc (1−ν) / Eα (1)
(However, αc: Four-point bending strength (MPa) at normal temperature, ν: Poisson's ratio at normal temperature, E: Young's modulus (MPa) at normal temperature, α: Average thermal expansion coefficient from normal temperature to 800 ° C)
The coefficient R represented by the coefficient represented by is preferably 600 or more, and more preferably 700 or more. If the coefficient R is less than 600, the roll may be broken. The coefficient R is a four-point bending strength αc (MPa) at room temperature measured for a test piece cut out from a roll.
, Poisson's ratio ν at room temperature, Young's modulus E (MPa) at room temperature, and average coefficient of thermal expansion α from room temperature to 800 ° C.

[Insertion member]
FIG. 4A is an enlarged cross-sectional view of FIG. 3, FIG. 4B is a view as viewed from the arrow A, and FIG. 4 is a view as viewed from the arrow B for the insertion member 3 inserted into the hollow portion of the body portion 1 a. This will be described with reference to (c). The insertion member 3 having a disc shape in this aspect is made of ceramics similarly to the trunk portion 1a, and has an outer diameter substantially the same as the inner diameter of the large-diameter surface 1L formed on the trunk portion 1a. Yes. The insertion member 3 is positioned in the axial direction by the right side surface being abutted against the alignment surface 1n of the body portion 1a, and is inserted into and fixed to the body portion 1a. The fixing method of the insertion member 3 may be mechanically fixed by a fixing member or the like, but is preferably fixed by shrink fitting from the viewpoint of stability of operation of the sink roll 1 and cost. The shrinkage-fit rate is preferably in the range of 0.01 / 1000 to 0.5 / 1000. When the shrinkage fit rate is less than 0.01 / 1000, the clamping force of the insertion member 3 by the body portion 1a is insufficient, and the insertion member may drop from the hollow portion. Moreover, when the shrinkage-fit rate exceeds 0.5 / 1000, the tightening force due to the shrink-fit becomes too large, and there is a possibility that the body portion 1a or the insertion member 3 is damaged. A more preferable shrink fitting rate is 0.2 / 1000 to 0.3 / 1000. The fixing of the intermediate portion 1c to the body portion 1a and the fixing of the shaft portion 1h to the intermediate portion 1c may be similarly performed by shrink fitting.

  The insertion member 3 inserted into the body 1a as described above has a center of gravity located within a predetermined range set according to the required vibration level, with the axis I serving as the rotation center as a base point. The recesses 3c to 3e having a circular cross section along the radial direction formed on the end face and the through hole 3b having a circular cross section penetrating the insertion member 3 in the axial direction are formed. The balance is adjusted. As shown in FIG. 4B, a plurality of the recesses 3c to 3e and the through holes 3b may be formed according to the amount of adjustment of the rotation balance. The size along is set appropriately. The depths of the recesses 3c to 3e in the axial direction are the same (when the depth of the recesses 3c to 3e exceeds the thickness of the insertion member 3, it can be said that the through hole 3b). There may be a case where the hole 3b is not formed. Further, the cross-sectional shapes of the recesses 3c to 3e and the through holes 3b along the radial direction are not limited to the circular shape, and various cross-sectional shapes such as a triangular shape, a rectangular shape, a polygonal shape, and the like can be applied. Since there is no portion, it is desirable to have a circular cross-section or an elliptical cross-section, and a circular cross-section that can be formed relatively easily by a removal method such as grinding is preferable from the viewpoint of cost.

  Further, the position where the through hole 3b or the recesses 3c to 3e are arranged is not limited, and may be formed at any position on the end face of the insertion member 3, but on the same circumference around the axis. It is desirable to be arranged in. Further, as the shape of the insertion member 3 viewed from the axial direction, for example, a triangular shape, a rectangular shape, a polygonal shape, an elliptical shape and other various shapes can be applied, but the rotational balance of the sink roll 1 can be easily adjusted. In addition, it is desirable to have a disk shape as in this embodiment because it can be firmly fixed by being in close contact with the large-diameter surface 1L over the entire circumference. Even if a part of the outer periphery of the insertion member 3 is formed with, for example, a groove, notch, hole, or other non-contact portion with the large-diameter surface 1L of the trunk portion 1a, the insertion member 3 is formed. The outer peripheral surface and the large-diameter surface 1L only need to be substantially in close contact with each other. 4B, a through hole 3f is provided in the center of the insertion member 3 in the radial direction, and the shape of the insertion member 3 viewed from the axial direction is an annular shape. May be inserted into the hollow portion of the body portion 1a so that the plane extending from the center intersects the axis I. In this case, the through holes 3b or the recesses 3c to 3e are provided between the inner peripheral surface and the outer peripheral surface of the annular insertion member 3.

  Here, as shown in FIGS. 3 and 4C, the through hole 3b or the recesses 3c to 3e of this aspect can face in the axial direction from the through hole portion 1d formed in the intermediate portion 1c. Formed in position. That is, the through-hole 3b or the recesses 3c to 3e of the present embodiment is configured such that after inserting and fixing the insertion member 3 and the intermediate portion 1c into the body portion 1a, a tool passed through the through-hole portion 1d of the intermediate portion 1c is used. It is formed by extending to the end face of the insertion member 3. With this configuration, the body 1a, the intermediate 1c, the shaft 1h, and the insertion member 3 are assembled to form the sink roll 1, and then the rotation balance is confirmed by a dynamic balance test or the like, The rotation balance of the roll 1 can be adjusted appropriately. Before assembling the body part 1a, the intermediate part 1c, and the shaft part 1h, the rotational balance is confirmed individually, and the body part 1a is adjusted by the adjustment amount obtained by calculation based on the confirmed individual rotational balance. The insertion member 3 in which the through holes 3b or the recesses 3c are formed in advance may be fitted and fixed to the body portion 1a before being assembled. In that case, the through-hole 3b or the recesses 3c to 3e are not necessarily formed at a position where the through-hole portion 1d of the intermediate portion 1c can face in the axial direction.

  The through-hole 3b provided in the insertion member 3 or the central through-hole part 3f of the annular insertion member 3 is a hollow part of the sink roll 1 in the same manner as the through-hole part 1d provided in the intermediate part 1c. The molten metal can be smoothly introduced into or discharged from the hollow portion. However, the through hole 3b or the through hole portion 3f is not necessarily provided. That is, the hollow portion of the barrel portion 1a is closed so that there is no flow of molten metal between the chambers separated into left and right by the disc-shaped insertion member 3 inserted in the hollow portion of the barrel portion 1a. You may comprise the insertion member 3 in the aspect.

[First Modification]
A first modification of the sink roll 1 will be described with reference to FIG. As shown in FIG. 5A, which is a partially enlarged front sectional view of the sink roll 4 according to the first modification, and in FIG. 5B, which is a right side view thereof, the insertion member 4a of the sink roll 4 includes Instead of the through hole 3b or the recess 3c of the insertion member 3, weights (balance weights) 4b to 4e are arranged in the side surface or a circular recess formed so as to open on the side surface. In addition, the structure of the insertion member 4a, the relationship with the trunk | drum 1a, and the arrangement | positioning method of the weight bodies 4b-4e are the same as that of the said insertion member 3 fundamentally. Further, in the modifications described below including the first modification, the same elements as those in the sink roll 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  Here, the weight body 4c disposed on the left end surface of the insertion member 4a is fixed to the end surface via an appropriate adhesive. Further, on the right end surface of the insertion member 4a, the weights 4b, 4d, and 4e arranged on the same circumference around the axis are formed as bottomed hole-shaped circular recesses formed on the right end surface of the insertion member 4a. It is inserted and fixed. The weights 4b, 4d, and 4e may be fixed to the low and low holes by, for example, screwing, but it is preferable to perform shrink fitting or cold fitting because the number of members is reduced and the configuration can be simplified. As with the through-hole 3b or the recess 3c, the position where the weights 4b to 4e are arranged, the mass, size, shape, material, and other conditions are appropriately set according to the adjustment amount of the rotation balance. The weights 4b to 4e can be made of metal, but since the metal is easily melted in the molten metal, the surface thereof is coated with a highly corrosion-resistant film made of ceramics, diamond-like carbon, or the like. It is preferable to keep it. Moreover, you may comprise the weight bodies 4b-4e with a super steel alloy, a cermet, etc. with high corrosion resistance and a comparatively high density.

[Second Modification]
A sink roll 5 which is a second modification of the sink roll 1 will be described with reference to FIG. The sink roll 5 is different from the sink rolls 1 and 4 in that (1) two insertion members having no through-holes are disposed at both ends of the hollow portion of the trunk in the axial direction, (2) In this way, the insertion member is arranged, and the buoyancy adjustment weight is arranged in the sealed space formed in the trunk part. (3) In addition to the insertion member arranged in the trunk part, two shafts It is different in that the insertion members are also arranged in the hollow portions of the respective portions. Here, any one of the insertion members disposed in the body portion may be provided, and the insertion member disposed in the shaft portion may be disposed in any one of the shaft portions. Further, the insertion member may be disposed only on the shaft portion without being disposed on the trunk portion. In addition, the buoyancy adjustment weight is not necessarily arranged, and any of them can be selected as necessary. In addition, in the third to sixth modifications described below including this modification, a through-hole part 1d for adjusting the rotational balance is provided after the insertion member is inserted like the intermediate part 1c constituting the sink roll 1. It is not done. Therefore, as described above, the rotational balance of the trunk, middle, and shaft is individually confirmed, and through holes, recesses, or weights are preliminarily determined according to the adjustment amount obtained by calculation based on the confirmed individual rotational balance. An insertion member in which the body is arranged is fitted into the body portion to constitute a sink roll having an adjusted rotational balance.

  The body portion 5a of the sink roll 5 of this aspect has a first step 1k at a predetermined position away from the left end surface to the right and a second step at a predetermined position away from the right end surface to the left. Part 5k is formed. The first step portion 1k and the second step portion 5k are respectively large diameter surfaces 1L and 5L that are inner peripheral surfaces formed by inner surface processing from both ends of the body portion 1a, and small diameters that are non-processed sintered surfaces. It is composed of a surface 1m and alignment surfaces 1n and 5n extending in the radial direction connecting the large diameter surfaces 1L and 5L and the small diameter surface 1m.

  And as for the insertion member 5d with the weight 5e which is the same structure as the insertion member of the said modification 1, the right side surface is abutted on the alignment surface 1n of the 1st step part 1k. Thus, positioning in the axial direction is performed, and the body portion 1a is fitted and fixed. In addition, the disc-shaped insertion member 5f, in which no weight body or concave portion is formed, is positioned in the axial direction by the left side surface being abutted against the alignment surface 5n of the second step portion 5k. The body 1a is fitted and fixed. As shown in FIG. 6, the positions at which the insertion members 5 d and 5 f are arranged are the bending stress most applied to the body portion 5 a corresponding to the end portion in the axial direction of the steel plate P in contact with the outer peripheral surface of the sink roll 5. This is the position where By arranging the insertion members 5d and 5f in this way, the insertion members 5d and 5f function to adjust the rotational balance of the sink roll 5, and the maximum stress acts on the body 5a by the contact of the steel plate P. By disposing at the position where it is positioned, the function of increasing the strength of the trunk portion 5a of the sink roll 5 can also be achieved. Further, as shown in FIG. 6, by arranging the insertion members 5i and 5g in the hollow portion of the shaft portion 1h, the strength of the shaft portion 1h can be similarly improved. If the insertion members 5i and 5g are arranged in the large-diameter portion, the fixing by fitting the intermediate portion 5c and the shaft portion 1h can be further strengthened.

  Here, when the insertion members 5d and 5f having no through-hole are arranged in the body portion 5a as in the above-described aspect, or the intermediate portion 5c in which the through-hole portion for introducing and discharging molten metal is not formed is the body portion 5a. When the insertion members 5i and 5g having no through holes are arranged in the shaft portion 1h, the right side surface of the insertion members 5d and 5i and the left side surface of the insertion members 5f and 5g are provided. And a sealed space defined by the inner surface of the body portion 5a. And since molten metal is not introduced into the sealed space, a large buoyancy is generated by the air confined in the interior, and wear of the sliding portion of the shaft portion 1h or a bearing (not shown) is advanced. Therefore, in the sink roll 5 of this aspect, the buoyancy adjustment weight 5j having a predetermined mass is disposed in the sealed space in order to impart gravity capable of canceling buoyancy. The buoyancy adjusting weight 5j may be a bulk weight disposed on the inner surface of the body portion 1a, for example, but if such a weight is provided, it may make it difficult to adjust the rotation balance of the sink roll 5. Therefore, it is desirable to be a liquid, powder, granule or other fluid that flows along the inner peripheral surface with the rotation of the sink roll 5, and is a metal powder or metal particle that is easily available in industrial production. Is more preferable. By using the fluid as the buoyancy adjustment weight in this way, the buoyancy adjustment weight always stays at the bottom of the hollow portion without accompanying the rotation of the sink roll 5, so that the buoyancy generated in the sink roll 5 is offset. The rotation balance can be easily adjusted.

[Third Modification]
A support roll 6 which is a third modification of the sink roll 1 will be described with reference to FIG. In the support roll 6 of this aspect, since the body part 1a is smaller in diameter than the sink roll, the second shaft part 6h is directly fitted into the recesses 1b formed at both ends of the body part 1a without using an intermediate part. It is fixed. The shaft portion 6h of this aspect is solid, and, like the sink roll 5 of the second modified example, a sealed space is formed between the inner side surface of each of the two shaft portions 6h and the inner peripheral surface of the body portion 1a. It is defined.

  As shown in FIG. 7 (b), which is an enlarged view of the portion C in FIG. 7 (a), the hollow portion of the body portion 1a has an alignment surface 1n of the stepped portion 1k formed in the central portion in the axial direction. An insertion member 6a is disposed so that the right side surface is in contact with the insertion member 6a, and a through hole 3b is formed in the insertion member 6a in order to adjust the rotation balance. Here, since the sealed space is formed in the support roll 6 of this aspect, it is preferable to have an element that cancels buoyancy. However, since the through hole 3b is formed in the insertion member 6a, a buoyancy adjustment weight different from the buoyancy adjustment weight of the second modification is used.

  That is, as shown in FIG. 7B, the insertion member 6a is formed with a through-hole portion 6d penetrating in the axial direction at the center thereof. Preferably, a substantially disc-shaped buoyancy adjusting weight 6e having a predetermined mass for offsetting buoyancy is disposed in the through-hole portion 6d having a substantially cylindrical inner peripheral surface. The outer diameter of the buoyancy adjusting weight 6e is substantially the same as the inner diameter of the through-hole portion 6d, and is fitted and fixed to the through-hole portion 6d, preferably by shrink fitting or cold fitting. Note that it is not sufficient to simply fix by fitting, and it may be necessary to prevent the buoyancy adjustment weight 6e from being detached in the axial direction. In this case, as shown in FIG. 7B, the width of the buoyancy adjustment weight 6e in the axial direction is made the same as the width of the insertion member 6a, and a flat plate-like omission is provided on both side surfaces of the insertion member 6a. The stopper member 6g may be disposed so that one surface thereof is in close contact, and both the stopper members 6g may be fixed to the insertion member 6a by the fixing member 6f. Further, the through-hole portion 6d is a stepped through-hole having a large-diameter portion and a small-diameter portion, the side surface of the buoyancy adjustment weight 6e is abutted against the inner end surface of the small-diameter portion, and only one side surface of the insertion member 6a Alternatively, the retaining member 6g may be arranged on the bottom.

[Fourth Modification]
A support roll 7 which is a fourth modification of the sink roll 1 will be described with reference to FIG. As shown in FIG. 8 (a), the support roll 7 of this aspect also has a solid shaft portion 6h directly in the recesses 1b formed at both ends of the body portion 7g without an intermediate portion. Inserted and fixed.

  The trunk portion 7g of the support roll 7 of this aspect has a hollow first trunk member 7a divided into a plurality of, in this aspect, two in the axial direction, and the outer diameter of the first trunk member 7a. It is comprised with the hollow 2nd trunk | drum member 7b which is the same and substantially the same length. The second body member 7b is arranged coaxially with the first body member 7a so that the left end surface thereof faces the right end surface of the first body member 7a. In the case of the support roll 7, the end surfaces of the first body member 7a and the second body member 7b are in close contact with each other so as not to damage the molten metal layer adhering thinly to the surface of the steel plate. However, when this configuration is applied to the sink roll, it is not always necessary to be in close contact with each other, and both end surfaces may be arranged so as to face each other with a certain gap.

  As shown in FIG. 8 (b), which is an enlarged view of the D portion in FIG. 8 (a), a weight body 4b for adjusting the rotational balance is arranged on the body members 7a and 7b arranged as described above. The inserted insertion member 7c is disposed so as to include both the opposite end surfaces of the first body member 7a and the second body member 7b in the axial direction, and is coupled, preferably coupled by shrink fitting. is doing. That is, the insertion member 7c of this aspect fulfills the function of adjusting the rotational balance of the support roll 7, and also fulfills the function of connecting the plurality of divided body members 7a and 7b constituting the body portion 7g. You can also. The shaft portion 6h does not need to be configured as a separate part from the body members 7a and 7b. The shaft member 6a has one shaft portion 6h and the body member 7b has the other shaft portion 6h. You may comprise integrally. Also in the support roll 7 of this aspect, the right side surface of the left shaft portion 6h, the sealed space defined by the left side surface of the insertion member 7c and the inner peripheral surface of the body portion 7a, and the right shaft portion 6h A sealed space defined by the left side surface, the right side surface of the insertion member 7c and the inner peripheral surface of the body portion 7b, and two sealed spaces are formed. However, similarly to the sink roll 5 of the second modified example, in order to adjust the buoyancy generated by the sealed space, the buoyancy adjusting weight 5j may be stored in the sealed space.

  The insertion member 7c includes a substantially cylindrical large-diameter portion 7e whose outer peripheral surface is in close contact with the inner peripheral surface of the body portion 7g, and a substantially disc-shaped thin-walled portion 7f whose axial thickness is smaller than that of the large-diameter portion 7e. The thin wall portion 7f may be connected to the inner peripheral surface of the large diameter portion 7e. By configuring the insertion member 7c in this way, the thickness of the insertion member 7c can be significantly reduced, so that the manufacture thereof is facilitated and the weight of the sink roll 7 can be reduced. Thus, high-speed rotation is possible during use, and the immersion speed of the steel sheet to be plated in the plating bath can be increased, so that the effect of improving the efficiency of the plating bath can be expected.

  Next, a fifth modified example and a sixth modified example, which are examples in which the insertion member is inserted into the hollow portion of the trunk portion in a mode different from the sink roll 1, will be described.

[Fifth Modification]
A fifth modified example of the sink roll 1 will be described with reference to FIG. 9 on the basis of the sink rolls 8 and 9 which are two aspects thereof. Here, FIG. 9A is a front sectional view of the sink roll 8 in which the peripheral portion of the insertion member 8a is enlarged, FIG. 9B is a view taken along arrow E in FIG. 9A, and FIG. Is a cross-sectional view taken along the line FF in FIG. 9 (c) is a front sectional view of the sink roll 9 in which the peripheral portion of the insertion member 9a is enlarged, FIG. 9 (d) is a G arrow view of FIG. 9 (c), and FIG. It is HH sectional view of Drawing 9 (d).

  The sink rolls 8 and 9 of the two aspects according to the fifth modification do not process the inner peripheral surface 1m of the body portion 1a, and the body portion 1a has an inner peripheral surface 1m curved along the axial direction. This is different from the sink roll 1 in that the insertion members 8a and 9a are arranged in the hollow portion.

  That is, the sink roll 8 of the first aspect according to the fifth modification has an insertion member 8a in which a concave portion 3c for rotation balance adjustment is formed on the right side surface, and the insertion member 8a has a radial direction. Convex convex toward the outside in the radial direction on a part of the outer periphery corresponding to the part convex toward the inner side (the hatched area in FIG. 9B). A flat portion 8b, which is a flat surface, is formed on the outer peripheral portion of the shape portion 8c. Although FIG. 9A is emphasized for the sake of understanding, the convex portion 8c of the insertion member 8a has a shape that forms a part of an arc in a cross-sectional view along the axial direction. The cross-sectional view along the line corresponds to a change in the convex portion of the body 1a, and smoothly changes so as to be flattened toward both ends in the circumferential direction. In addition, the cross-sectional shape of the convex portion 8c along the axial direction is not limited to the above, but may be a substantially semicircular shape, a trapezoidal shape, or a triangular shape, but the insertion member 8a is fitted into the trunk portion 1a. In view of preventing damage to the inner peripheral surface 1m at the time and facilitating the insertion work of the insertion member 8a, it is preferable to form a part of an arc. Also, the flat portion 8b may correspond to the concave portion of the inner peripheral surface 1m of the body 1a, and a convex portion that extends outward in the radial direction may be formed.

  The insertion member 8a is preferably fixed to the hollow portion of the body portion 1a by shrink fitting. Specifically, the body portion 1a is heated so as to achieve the shrinkage fitting rate already described, the insertion member 8a is inserted into the hollow portion of the expanded body portion 1a, and then the body portion 1a is cooled to room temperature. . The insertion member 8a has both ends of a flat surface formed on the inner peripheral surface 1m of the body portion 1a in which the top of the convex portion 8c formed on a part of the outer periphery forms a convex shape and on the other part of the outer periphery. Are in contact with the inner peripheral surface 1m of the body portion 1a having a concave shape, so that the insertion member 8a is fixed to the hollow portion of the body portion 1a.

  Next, the sink roll 9 of the 2nd aspect concerning a 5th modification is demonstrated. The sink roll 9 has a substantially disc-shaped insertion member 9a in which a concave portion 3c for adjusting the rotation balance is formed on the right side. The insertion member 9a has a plate shape having elasticity such as metal / resin. The elastic member 9c is inserted into and fixed to the unprocessed inner peripheral surface 1m of the body portion 1a. Specifically, the outer diameter of the insertion member 9a having the flat outer peripheral surface 9b is smaller than the inner diameter of the hollow portion of the trunk portion 1a, and the elastic member 9c inserts the insertion member 9a into the hollow portion of the trunk portion 1a. The annular gap 9d formed at this time has substantially the same thickness, and three pieces are arranged in the gap 9d at an equal angle of 120 °.

  The said insertion member 9a is fixed to the hollow part of the trunk | drum 1a, preferably by shrink fitting. Specifically, three elastic members 9c that have been deformed in advance so as to follow the curvature of the outer peripheral surface 9b are arranged on the outer peripheral surface 9b of the insertion member 9a in the above positional relationship. Next, the body portion 1a is heated so as to achieve the shrinkage-fit rate already described, and the three elastic members 9c and the insertion member 9a arranged as described above are inserted into the hollow portion of the expanded body portion 1a. The body 1a is cooled to room temperature. Then, the elastic member 9c pressed by the shrinking body portion 1a is deformed by the elasticity of the outer peripheral surface 9b of the insertion member 9a and the unprocessed inner peripheral surface 1m of the body portion 1a. The insertion member 9a is fixed to the portion.

[Sixth Modification]
A sixth modification of the sink roll 1 will be described with reference to FIG. Here, FIG. 10A is a front sectional view of the sink roll 10 in which the peripheral portion of the insertion member 10a is enlarged, FIG. 10B is a view taken along the arrow J in FIG. 10A, and FIG. Is a sectional view taken along the line KK of FIG. FIG. 10C is an enlarged view of a portion I in FIG.

  The sink roll 10 according to the sixth modification is different from the sink roll 1 in that (1) the insertion member 10a is formed by a combination of a plurality of members, and (2) the plurality of members are connected to the inside of the body portion. The difference is that the insertion member 10a is fixed by being pressed against the peripheral surface.

  That is, the insertion member 10a of the present embodiment is separated from the first insertion member 10b having a semicircular shape having a plane 10j parallel to the axis of the body 1a by a certain gap 10i with respect to the plane 10j. And a second insertion member 10c having a flat surface 10k arranged to face each other. The first insertion member 10b in which the concave portion 3c for adjusting the rotation balance is formed on the right side is the upper half of the inner peripheral surface 10g of the substantially annular groove formed in the center of the body 1a in the axial direction. In addition, the second insertion member 10c having the outer peripheral surface 10f in close contact and the recess 3c for adjusting the rotation balance on the right side is formed on the lower half of the inner peripheral surface 10g of the groove. 10e is pressed and fixed to the inner peripheral surface 10g of the groove portion by the pressing portions 10h so that they are in close contact with each other. In addition, although the insertion member 10a of this aspect is comprised with two members called the 1st insertion member 10b and the 2nd insertion member 10c, it is not limited to this, It is comprised with more members. It doesn't matter. Further, the positions of the planes 10j and 10k of the first insertion member 10b and the second insertion member 10c are also near the center of the trunk portion 10a as seen from the axial direction as shown in FIG. 10B. It does not need to be arranged, and may be located above or below the center, and the direction may be arranged in a vertical direction or an oblique direction. However, from the viewpoint of ease of manufacture, it is desirable to configure like the insertion member 10a of this aspect.

  The details of the pressing portion 10h for pressing the first insertion member 10b and the second insertion member 10c against the inner peripheral surface 10g of the groove will be described. The pressing portion 10h of this aspect is a structure that generates a pressing force using the wedge effect in particular, and includes a lower surface 10m that is a plane parallel to the axis and an upper surface 10L that is an inclined surface inclined downward to the left. The movable piece 10n, the fixed piece 10q having a leg straddling the first insertion member 10b and the second insertion member 10c and contacting the left side of both, and the movable piece 10n and the fixed piece 10q are coaxial. The fixing screw (bolt) 10s inserted into the through holes 10p and 10r formed in the axial direction, and the fixed ring (nut) 10t screwed to the right end of the fixing screw 10s. Further, when viewed from the axial direction, a concave portion opened downward is formed in the center of the lower portion of the first insertion member 10b and has an upper surface 10o inclined at the same angle as the inclined surface 10L of the movable piece 10n. Yes. The movable piece 10n is disposed so that the inclined upper surface 10L is in close contact with the concave upper surface 10o of the first insertion member 10b and the lower surface 10m is in contact with the flat surface 10k of the second insertion member 10c. In addition, although it is desirable that each element constituting the pressing portion 10h is made of ceramics similarly to the insertion member 10a, it may be made of metal when used in an atmosphere that does not touch the plating bath. I do not care.

  According to the pressing portion 10h, the movable piece 10n that moves to the left by the fastening operation of the fixing screw 10s and the fixed ring 10q has an inclined upper surface 10L having a concave upper surface 10o of the first insertion member 10b and a lower surface 10m. Is in intimate contact with the flat surface 10k of the second insertion member 10c, the wedge effect pushes the first insertion member 10b upward and the second insertion member 10c downward, The surfaces 10f and 10e can be pressed against the inner peripheral surface 10g of the groove portion to fix the insertion member 10a to the hollow portion of the body portion 1a. The pressing portion is not limited to the configuration using the wedge effect, and for example, a compression spring or other elastic body is arranged in the gap 10i between the first insertion member 10b and the second insertion member 10c, and both are used as grooves. It is good also as a structure to press. Further, a plurality of pressing portions may be provided on the left and right as well as the central portion.

1 (4, 5, 8, 10) Sink roll 6 (7) Support roll 1a (5a, 6a, 7g,) Body 1c Intermediate part 1h (6h) Shaft 3 (4a, 5d, 5f, 5g, 5i, 6a, 7c, 8a, 9a, 10a) Insertion member 3b Through-hole 3c Recess 4b Weight 5j (6e) Buoyancy adjustment weight

Claims (20)

  A rotating body having a hollow ceramic body having an axial center, and a shaft disposed coaxially with the body and extending axially from both ends of the body, A rotating body having a plate-like or annular insertion member inserted into the hollow portion, and the insertion member is provided with a recess or a through-hole on an end surface thereof.   The rotating body according to claim 1, wherein a weight body is disposed on the insertion member instead of the recess or the through hole.   The said insertion member is comprised with the ceramic whose thermal expansion coefficient in use atmosphere is substantially the same as the said trunk | drum, and is inserted and fixed to the hollow part of the said trunk | drum. Rotating body.   The rotating body according to claim 3, wherein a part of the outer periphery of the insertion member has a convex shape in the radial direction.   The rotating body according to claim 3, wherein the insertion member is fitted and fixed in a hollow portion of the trunk portion via an elastic member that is in close contact with an inner peripheral surface of the trunk portion.   The rotating body according to claim 3, wherein a step portion is formed on an inner surface of the body portion, and the insertion member is fitted and fixed to a large diameter portion of the step portion.   The rotating body according to claim 1, wherein the insertion member is fixed to the hollow portion of the trunk portion by shrink fitting.   The shape of the outer peripheral edge of the insertion member viewed from the axial direction is substantially circular, and the outer peripheral surface of the insertion member is disposed so as to be in close contact with the inner peripheral surface of the body portion. The rotating body according to any one of 7.   A substantially annular groove portion is formed on the inner peripheral surface of the trunk portion, and the insertion member has a flat surface parallel to the axis and the inner peripheral surface of the groove portion of the trunk portion. The first insertion member inserted into a part of the groove portion with the outer peripheral surface of the insertion member being in close contact with the first insertion member is disposed so as to face one plane of the first insertion member with a certain gap. And a second insertion member inserted into the other part of the groove part in a state where the outer peripheral surface is in close contact with the inner peripheral surface of the groove part, the first insertion member and the second insertion member. The rotating body according to claim 3, further comprising a pressing portion that presses the insertion member against the inner peripheral surface of the groove portion.   The rotating body according to any one of claims 1 to 9, wherein a plurality of the recesses, through holes, or weights are arranged on the same circumference around an axis of the body part.   The rotating body according to claim 1, wherein the shaft portion is hollow, and the insertion member is disposed in at least one hollow portion of the shaft portion instead of the body portion.   The rotating body according to claim 1, wherein the insertion member is disposed at a position where a maximum stress is generated in the trunk portion or the shaft portion when the rotating body is used.   The shaft portion includes a hollow first shaft portion disposed at one end of the body portion and a hollow second shaft portion disposed at the other end, and the insertion member is The rotating body according to claim 1, wherein the rotating body is disposed on at least one of the first shaft portion and the second shaft portion.   The body portion includes at least a hollow first body member and a second body member having the same outer diameter as that of the first body member, and the second body member. Is arranged coaxially with the first body member, with one end face thereof facing the one end face of the first body member, and the insertion member is arranged in the axial direction in the first body. The rotating body according to any one of claims 1 to 13, wherein the rotating body is disposed so as to include both of one end face of the member and the second body member facing each other.   The insertion member includes a substantially cylindrical large-diameter portion whose outer peripheral surface is in close contact with the inner peripheral surface of the body portion or the shaft portion, and a substantially disk-shaped thin-wall portion whose thickness in the axial direction is thinner than the large-diameter portion. The rotating body according to claim 1, wherein the thin portion is connected to an inner peripheral surface of the large diameter portion.   The rotary body is a roll for a molten metal plating bath, and the insertion member has a groove portion formed in an outer peripheral surface thereof and extending in the axial direction, and both ends of the groove portion are open. The rotating body according to any one of the above.   The rotator according to any one of claims 1 to 16, wherein the rotator is a molten metal plating bath roll, and a buoyancy adjusting weight is disposed in a through hole portion of the annular insertion member.   The rotating body is a roll for a molten metal plating bath, and the plate-like insertion member is disposed in the body part or the shaft part so as to seal the inside of the body part, and inside the body part, The rotating body according to any one of claims 1 to 15, wherein a buoyancy adjusting weight is disposed.   When at least one of the first shaft portion and the second shaft portion extending from both ends of the body portion is a solid substantially columnar shape and the other is a substantially cylindrical shape, the plate-like interpolation is placed on the other. The rotating body according to claim 18, wherein the member is disposed.   20. The rotating body according to claim 18, wherein the weight for adjusting buoyancy is a fluid that flows along the inner peripheral surface of the body portion as the body portion rotates.