JPH0596544U - Bearing device for hot dip bath immersion roll - Google Patents

Abstract

(57) [Abstract] (Correction) [Constitution] The roll 1 side bearing box 5 of the rotary shaft 3 of the hot dip bath dipping roll 1 is provided with an inert gas introduction sealed compartment 6 on its rotary sliding surface. A high pressure inert gas is filled in the chamber 6 through an inert gas supply pipe connected to the chamber 6. At the other end of the rotary shaft 3, a melting furnace 9 in which a heating element 8 is embedded is filled with a bath 10 of a low melting point metal different from the plating metal in an amount corresponding to the bath pressure of the plating metal. A bath 10 of molten low-melting metal is forcedly circulated by a stirring blade 13 that is planted in a rotary transmission driven by 11, 12. [Effect] Inside the bearing, the inert gas introduction closed compartment 6
The high-pressure inert gas enclosed inside prevents the hot-dip metal bath from entering the bearing box, and the low-melting metal bath that is forcedly circulated in the other melting furnace melts at the same time. The high heat transfer of the plating metal bath and the oxidizing atmosphere are shut off to improve the durability of the bearing and to make the roll rotate smoothly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing device for a molten plating bath dipping roll arranged in a molten plating bath, such as an exit roll for holding a steel strip pass line running in the hot dipping bath or a direction turning roll. is there.

[0002]

[Prior Art]

 Generally, a continuous hot-dip metal plating line is used to make a steel strip of a material to be annealed through a continuous annealing furnace through a plating bath in which the plating metal has been melted, to make a plating, and to obtain a predetermined coating weight. After controlling the wiping, the alloy is subjected to external treatment such as alloying or zero treatment, followed by temper rolling and post-treatment to manufacture plated products.

However, bath immersion rolls such as exit rolls and direction turning rolls used in the hot dip bath of the plating line use roll materials having excellent heat resistance and corrosion resistance, and their bearings are manufactured. Planar bearings, also known as plain bearings, have been used for some time because they are inexpensive and easy to adjust and assemble.

However, on the other hand, in the case of a flat bearing, corrosion of the plating bath metal and contact wear reduce the thickness of the bearing, which causes the roll to tilt, impeding the passage of the roll, and the contact to be rough, causing vibration to the rotating roll. There was a problem that the bearing replacement time is accelerated, such as causing In particular, in a bath immersed in a metal bath, a large load of steel strip tension acts, so that the bearing portion is heavily worn and vibration due to uneven wear is likely to occur. There was a problem that the number of rolls increased and rotation failure of the rolls was likely to occur, causing scratches.

[0005]

[Problems to be solved by the device]

 As a measure to solve these problems, various technologies have been developed, such as flat bearings made of wear-resistant material to extend the service life and plating bath immersion rolls with grooves on the roll surface to prevent slip flaws. .. The bearing device has been introduced in many publications to date, for example, in Japanese Utility Model Laid-Open No. 1-65424, "a grease chamber closed with a porous material in a fixed side spacer of an outer ring or an inner ring and a face-to-face rotation of the chamber. A roller bearing lubrication device that reliably supplies the minimum required grease according to the operating conditions by providing a groove around the side spacers. In Japanese Patent Laid-Open No. 2-153055, "Roll End Supports" A ceramic rolling bearing is fitted on the base, a pedestal supporting the rolling bearing is arranged, and a centering mechanism is added to one of the bearing boxes installed at the tip of the bearing mounting arm that supports these. Bearing support device for bath dipping rolls ". However, since all the bearings are manufactured to have a structure that is weak against the hot-dip bath temperature, there is a problem that the roll cannot rotate.

[0006]

[Means for Solving the Problems]

 The purpose of the present invention is to provide a hot dip bath immersed roll having a bearing structure that solves these problems. The gist of the present invention is to mount a bearing on the rotary shaft of the roll placed in the hot dip bath to support it. A sealed chamber for introducing inert gas is provided on the sliding surface of the rotating shaft of the bearing box to seal the inside of the box, and at the other end of the rotating shaft, a low melting point metal bath different from the plating metal is placed in the melting furnace. A bearing device for a hot dip bath dipping roll, in which a bevel gear mechanism transmission body having a sealed metal bath stirring blade is planted on the peripheral surface of a driven gear that is sealed and meshes with a drive gear that rotates in the bath.

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 and 2 are a sectional view and a perspective view of a rotating portion of a driven gear according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a roll, which is soaked and arranged in a molten plating bath 2 in which aluminum, zinc, tin or other metal is mixed and melted to smoothly and stably convey a running steel strip. Is. A rotating shaft 3 is connected to the roll 1.

One or more bearings 4 are mounted on the rotating shaft 3 and supported by a bearing box 5. Further, the roll 1 side bearing box 5 of the rotating shaft 3 is provided with an inert gas introduction hermetically-sealed chamber 6 on the rotary sliding surface, and an inert gas supply pipe 7 for introducing the inert gas is connected to the chamber 6. Has been done. That is, the rotating shaft 3 smoothly rotates the roll 1 while preventing the molten molten metal bath 2 from entering the bearing box 5 by the high-pressure inert gas introduced into the inert gas introduction closed compartment 6. It is provided to do.

Further, on the other end side of the rotating shaft 3, a bath 10 of a low melting point metal, which is different from the molten plating metal and is equivalent to the bath pressure of the metal, is enclosed in a melting furnace 9 in which a heating element 8 is embedded. In addition, the driven gear 12 that rotates in the bath 10 is driven by meshing with a bevel gear mechanism, and several enclosed metal bath stirring blades 13 as shown in FIG. An angled and planted rotary transmission is attached. The low-melting-point metal bath 10 of the melting furnace 9 has a lubricating function of smoothing the rotation of the bearing 4 and thus the roll 1. Reference numeral 14 is an outlet for the low melting point metal of the melting furnace 9.

The hot dip dipping roll supported by the bearing device of the present invention as described above introduces the hot dip coating which enters the bearing box 5 into the inert gas introduction closed compartment 6 while introducing a high pressure inert gas. Also, the low melting point metal bath melted in the melting furnace 9 is forcibly circulated through the rotating bath stirring blade 13 while stirring with the rotating blade stirring blade 13 to prevent local solidification and rotate smoothly. To do.

[0011]

[Effect of the device]

 Thus, since the inside of the bearing of the present invention is filled with the molten low melting point metal, it is not exposed to the high temperature heat and the oxidizing atmosphere transmitted from the molten plating bath, and the molten plating bath dipping roll is smoothed. The steel surface that runs on the continuous molten metal plating line is smoothly and stably conveyed, and has a beautiful surface appearance without scratches on the rolls, group patterns, or vibration of the plating device, which does not cause the plating weight to become improper or the dross to adhere. It is possible to manufacture a plated steel sheet exhibiting the above.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 shows a perspective view of a rotating portion of a driven gear.

[Explanation of symbols]

 1 Roll 2 Hot-dip galvanizing bath 3 Rotating shaft 4 Bearing 5 Bearing box 6 Inert introduction sealed compartment 7 Inert gas supply pipe 8 Heating element 9 Melting furnace 10 Low melting point metal bath 11 Drive gear 12 Driven gear 13 Enclosed metal stirring Blade 14 Low melting point metal outlet

Claims (1)

[Scope of utility model registration request] 1. A sealed box chamber for introducing an inert gas is provided on a sliding surface of a rotating shaft of a bearing box which is mounted and supported by a rotating shaft of a roll arranged in a hot dip bath to seal the inside of the box. Along with the other end of the rotary shaft, a low melting point metal bath different from the plating metal is sealed in the melting furnace, and a sealed metal bath stirring blade is installed on the peripheral surface of the driven gear that meshes with the drive gear rotating in the bath. A bearing device for a hot dip dipping roll, characterized in that a transmission of a bevel gear mechanism that has been planted is attached.