Multi-point tile type radial bearing bush supporting structure for front and rear stabilizing rollers of zinc pot of hot-dip unit

Abstract

The invention discloses a multipoint tile type radial bearing bush supporting structure for front and rear stabilizing rollers of a zinc pot of a hot-dip unit, which comprises a plurality of bearing bushes arranged in the circumferential direction of a shaft sleeve of a roller body, and the plurality of bearing bushes are arranged in the circumferential direction of the shaft sleeve to form a friction area and supporting points; according to the temperature of metal liquid in the galvanized pot, the bearing bushes in the friction area and the supporting points are arranged in a variable mode. In order to obtain strip steel in a zinc pot, the hardness of the bearing bushes of the front and rear stabilizing roller shaft sleeves is matched, and the structure of the bearing bushes is improved, so that the roller bodies of the front and rear stabilizing rollers are always in good contact with the strip steel, the centering is accurate, and poor operation of a roller system is prevented to cause product defects.

Description

Technical Field

[0001] The present invention relates to the technology of hot-dip coating equipment in the cold rolling process of strip steel production, and more specifically, to a multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit. Background Art

[0002] The hot-dip coating unit, also known as the continuous hot-dip coating unit for strip steel, is a production line for continuously producing strip steel with a hot-dip coating. The "hot-dip coating" process is completed in a zinc pot, and the metal bath in the zinc pot is composed of two or more combinations of zinc, aluminum, magnesium, silicon, iron, etc. According to the different compositions of the specific metal liquid, there are pure zinc coatings, zinc-iron alloy coatings, zinc-aluminum-magnesium alloy coatings, aluminum-silicon alloy coatings, etc. in industrial production sites. Correspondingly, there are hot-dip galvanizing units, hot-dip galvanized zinc-iron units, hot-dip aluminum-zinc units, hot-dip galvanized aluminum-magnesium units, hot-dip aluminum-silicon units, etc. In the above units, the temperature of the metal liquid ranges from 400 to 700 °C.

[0003] As Figure 1 shown, the strip steel 100 enters the zinc pot obliquely. After the strip steel 100 is turned by the sink roll 7, it goes vertically upward and passes through two positioning rolls, which are respectively called the front stabilizing roll 1 and the rear stabilizing roll 2. Some are also called the leveling roll and the stabilizing roll respectively. According to the running direction of the strip steel 100, the first contacted one is the front stabilizing roll 1, and the later contacted one is the rear stabilizing roll 2.

[0004] From Figure 1 it can be seen that the strip steel 100 is turned by the sink roll 7 after passing through the zinc pot, and the wrap angle between the sink roll 7 and the strip steel 100 is large enough. The functions of the front and rear stabilizing rolls 1 and 2 are to keep the trajectory line of the strip steel 100 stable when the strip steel 100 moves upward after leaving the sink roll 7. For most hot-dip coating units, once the positions of the sink roll 7 and the rear stabilizing roll 2 are installed, they will not be adjusted anymore. The position of the front stabilizing roll 1 can be horizontally moved. This horizontal movement of the front stabilizing roll 1 is often called "insertion amount" in the production site. This horizontal position adjustment of the front stabilizing roll 1 is to enable sufficient frictional torque to be generated between the strip steel 100 and the front and rear stabilizing rolls 1 and 2 to achieve the rotation of the roll system, especially the synchronous rotation matching the speed of the strip steel 100. Since the zinc pot roll system is immersed in the metal bath as a whole and the rolls are passive structures, the state of the strip steel 100 and the roll body is one of the key factors for the stable operation of this production equipment.

[0005] The strip steel leaves the surface of the zinc bath. The strip steel undergoes so-called hot-dip coating in the zinc bath and forms a corresponding coating. Obviously, the three rolls in the zinc bath, including the sink roll, the front stabilizing roll, and the rear stabilizing roll, are rotating mechanical equipment immersed in the high-temperature metal liquid as a whole. Sliding bearings, often called "bush bearings", are required to support both sides of each of the three rolls.

[0006] AsFigure 2 and Figure 3 The front and rear stabilizing rollers 1 and 2 of the zinc pot roll system shown in Figure 3 . Among them, 6 is the roll body of the front and rear stabilizing rollers, 3 is the bushing installed at the position of the roll body shaft head, which rotates with the roll system during use, 4 is the bearing bush, which matches with the bushing to form a friction pair, 5 is the bearing bush seat, and the bearing bush 4 and the bearing bush seat 5 are components that do not rotate by themselves.

[0007] For the actual front and rear zinc pot front and rear stabilizing roller systems in use, there are mainly two types of designs: Design 1: The front stabilizing roller can move back and forth, and the position of the rear stabilizing roller is fixed; Design 2: Both the front and rear stabilizing rollers can move back and forth.

[0008] There are key requirements of "long life" and "stability" for the operation of the zinc pot roll system.

[0009] "Long life" of the zinc pot roll system: When continuously hot-dip galvanizing high-aluminum zinc-coated strip steel, the composition and temperature of the metal bath have an important impact on the continuous hot-dip galvanizing process of strip steel. Usually, elements such as zinc, aluminum, magnesium, and silicon in the zinc liquid will cause the corrosion rate of the strip steel and iron facilities in the zinc pot to accelerate under the melting at 590 - 600°C. Therefore, for the friction pair materials such as the bushings and bearing bushes of the zinc pot rolls in the high-aluminum zinc hot-dip galvanizing unit, first, the bushings and bearing bushes should have excellent corrosion resistance; second, the bushings and bearing bushes should have excellent wear resistance. The strip steel moves at a speed of up to 3 - 4 m / s, and the force is 3 - 6 tons at the same time, or the tensile stress is (1 / 10 - 1 / 3) of the yield limit of the strip steel. The bushings and bearing bushes are used as supporting components; third, the bushings and bearing bushes should also have excellent high-temperature resistance, that is, at 600°C, the material still has good mechanical properties, etc. At present, the bearing life of the zinc pot roll system in the high-aluminum zinc hot-dip galvanizing unit is generally short, about 7 - 14 days. Therefore, there is an urgent need in the industry to develop bushing materials with high-temperature resistance of 600°C, corrosion resistance to aluminum-zinc liquid, and wear resistance.

[0010] "Stability" of the zinc pot roll system: The strip steel enters and exits the zinc pot through three rolls, and there is a "stability" requirement for the strip steel passing line. The "stability" of the strip steel trajectory line is one of the prerequisite conditions for obtaining high-quality coatings. At the production site, quality problems caused by the "instability" of the strip steel trajectory line frequently occur. Analyzing the reasons, it is mainly due to the low positioning accuracy of the front and rear stabilizing rollers, and problems such as "blocked rotation" of the front and rear stabilizing rollers are likely to occur, resulting in scratches on the surface of the strip steel.

[0011] Such as Figure 4As shown in the figure, currently, the structural form of the bearing seats of the front and rear stabilizing rollers is mainly the "circle - circle" structure, that is, both the bushing and the bearing shell are circular structures. In some actual practices, the bearing shell is a 1 / 2 or 1 / 3 arc, which is essentially also a "circle - circle" structure. Usually, the diameter difference △D between the outer diameter of the bushing and the inner diameter of the bearing shell is 3 - 5 mm. For the actual sliding bearing with the "circle - circle" structure, △D is necessary. However, in fact, due to the existence of △D, the center of the roll body, that is, the center line of the bushing, is not fixed. As Figure 4 (a) in is the "ideal" position of the roller, that is, the position under the premise of ignoring gravity and buoyancy while under the action of the strip tension. As Figure 4 (b) in is the position of "no strip tension", that is, the strip is separated from the roller, and the actual position of the roller under the action of only buoyancy and gravity. As Figure 4 (c) in is the "actual working position" of the roll system. In the real environment, the gravity and buoyancy of the roller are determined, but due to the changing strip tension, and for some units, both the front and rear stabilizing rollers are designed to be horizontally movable, that is, "feeding" towards or away from the strip, and their positions are also changing, that is Figure 4 the data of D in is changing. Therefore, the meshing position of the bushing (that is, the roll system) and the bearing shell (that is, the roll stand) of the front and rear stabilizing rollers is unstable, showing a "fluctuating" random state. This uncertainty in position is the root cause of the blocking of small rollers and the swaying of the strip. Summary of the Invention

[0012] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a multi - point tile - type radial bearing shell support structure for the front and rear stabilizing rollers of the zinc pot in a hot - dip galvanizing unit. In order to obtain the matching of the hardness of the bushing and the bearing shell of the front and rear stabilizing rollers when the strip is in the zinc pot, the structure of the bearing shell is improved and designed so that the roll body of the front and rear stabilizing rollers is always in good contact with the strip, thereby obtaining precise centering and preventing the poor operation of the roll system, resulting in product defects.

[0013] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions:

[0014] A multi - point tile - type radial bearing shell support structure for the front and rear stabilizing rollers of the zinc pot in a hot - dip galvanizing unit, including multiple bearing shells arranged circumferentially around the bushing of the roll body;

[0015] The multiple bearing shells are arranged circumferentially around the bushing to form a friction zone and support points;

[0016] According to the temperature of the molten metal in the galvanizing pot, the bearing shells in the friction zone and the support points are arranged in a variable manner.

[0017] Preferably, the temperature of the molten metal in the galvanizing pot is as follows:

[0018] The molten metal in the galvanizing pot is zinc, and the temperature is 460°C ± 10°C;

[0019] The molten metal in the galvanizing pot is zinc-aluminum, and the temperature is 590°C ± 10°C;

[0020] The molten metal in the galvanizing pot is aluminum-silicon, and the temperature is 690°C ± 10°C.

[0021] Preferably, the variable setting of the bearing bush in the friction zone and the support point is as follows:

[0022] The number N1 of the bearing bushes in the friction zone is 2 or 3;

[0023] The span T1 of the friction zone is 90° to 120°;

[0024] The number N2 of the support points is 1;

[0025] The central offset angle T3 of the support point is 15° to 45°.

[0026] Preferably, the variable setting of the central line offset angle T2 of the friction zone is as follows:

[0027] When the molten metal in the galvanizing pot is zinc, the temperature is 460°C ± 10°C, and N1 = 2, the central line offset angle T2 of the friction zone = 0°;

[0028] When the molten metal in the galvanizing pot is zinc, the temperature is 460°C ± 10°C, and N1 = 3, the central line offset angle T2 of the friction zone = 45°;

[0029] When the molten metal in the galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and N1 = 2, the central line offset angle T2 of the friction zone = 0°;

[0030] When the molten metal in the galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and N1 = 3, the central line offset angle T2 of the friction zone = 30°;

[0031] When the molten metal in the galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, and N1 = 2, the central line offset angle T2 of the friction zone = 0°;

[0032] When the molten metal in the galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, and N1 = 3, the central line offset angle T2 of the friction zone = 15°.

[0033] Preferably, the initial clearance C1 at the midpoint of the friction zone is 1 to 2 mm;

[0034] The radial distance C2 between the support point and the outer circle of the bushing is 1 to 2 mm.

[0035] Preferably, when the molten metal in the galvanizing pot is zinc and the temperature is 460°C ± 10°C, the bushing is prepared by plasma cladding or laser cladding;

[0036] The bearing bush is made of silicon nitride ceramic prepared by hot isostatic pressing.

[0037] Preferably, the cladding layer powder of the bushing consists of a binder phase and a hard phase.

[0038] Preferably, the binder phase is a nickel-based alloy;

[0039] The hard phase is tungsten carbide.

[0040] Preferably, the weight percentage of tungsten carbide is not less than 60%, and the microhardness of the obtained wear-resistant layer is HRC 50 - 60.

[0041] Preferably, the Vickers hardness of the silicon nitride ceramic is between 1250 and 1350.

[0042] Preferably, when the molten metal in the galvanizing pot is zinc-aluminum and the temperature is 590°C ± 10°C, and / or

[0043] when the molten metal in the galvanizing pot is aluminum-silicon and the temperature is 690°C ± 10°C, the bushing is prepared by plasma cladding or laser cladding;

[0044] The bearing bush is made of silicon nitride ceramic prepared by hot isostatic pressing.

[0045] Preferably, the cladding layer powder of the bushing consists of a binder phase and a hard phase.

[0046] Preferably, the binder phase is a cobalt-based alloy;

[0047] The hard phase is tungsten carbide.

[0048] Preferably, the weight percentage of tungsten carbide is not less than 45%, and the microhardness of the obtained wear-resistant layer is HRC 55 - 60.

[0049] Preferably, the Vickers hardness of the silicon nitride ceramic is between 1250 and 1350.

[0050] A multi-point pad type radial bearing support structure for the stabilizing rollers before and after the zinc pot of a hot-dip coating unit provided by the present invention optimizes the hardness matching of the bushings and bearing bushes of the front and rear stabilizing rollers, and newly designs the structure of the bearing bushes, so that during the actual operation of the front and rear stabilizing rollers, the roll body and the strip steel are always in good contact, thereby accurately centering and preventing the occurrence of product defects caused by poor operation of the roll system. Description of the Drawings

[0051] Figure 1 is a schematic flow diagram of a zinc pot in an existing hot-dip galvanizing line;

[0052] Figure 2 is a schematic diagram of the front and rear stabilizing rollers in an existing hot-dip galvanizing line;

[0053] Figure 3 is Figure 2 a schematic diagram in the A-A direction of

[0054] Figure 4 is a schematic diagram of the positions of the bearing seats in the existing front and rear stabilizing rollers, where (a) is the ideal position, (b) has no tension problem, and (c) is the actual working position;

[0055] Figure 5 is a schematic diagram of the structure of the multi-point segmental radial bearing support structure for the front and rear stabilizing rollers of the zinc pot in the hot-dip galvanizing line of the present invention when it adopts a three-point type;

[0056] Figure 6 is a schematic diagram of the structure of the multi-point segmental radial bearing support structure for the front and rear stabilizing rollers of the zinc pot in the hot-dip galvanizing line of the present invention when it adopts a four-point type. Detailed implementation manners

[0057] In order to better understand the above technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0058] Combined with Figure 5 and Figure 6 shown, a multi-point segmental radial bearing support structure for the front and rear stabilizing rollers of the zinc pot in a hot-dip galvanizing line provided by the present invention includes a plurality of bearing bushes 12 circumferentially arranged around a bushing 11 of a roller body 10.

[0059] The plurality of bearing bushes 12 are arranged circumferentially around the bushing 10 to form a friction zone 13 and support points 14.

[0060] According to the temperature of the molten metal in the galvanizing pot and whether the front stabilizing roller can move forward and backward, the bearing bushes 12 in the friction zone 13 and the support points 14 are variably arranged.

[0061] The temperature of the molten metal in the galvanizing pot, and the corresponding bushing 11 and bearing bushes 12 are prepared as follows:

[0062] When the molten metal in the galvanizing pot is zinc and the temperature is 460°C ± 10°C, the bushing 11 is prepared by plasma cladding or laser cladding. The cladding layer powder consists of a bonding phase and a hard phase. Among them, the bonding phase is a nickel-based alloy, and the hard phase is tungsten carbide. The weight percentage of tungsten carbide is not less than 60%. The microhardness of the obtained wear-resistant layer is HRC 50 - 60. The bearing shell 12 is made of silicon nitride ceramic prepared by hot isostatic pressing. The key index is that the Vickers hardness (HV10) of the silicon nitride ceramic is between 1250 - 1350. The friction pair composed of the bushing 11 and the bearing shell 12 prepared in this way has good wear matching performance.

[0063] When the molten metal in the galvanizing pot is zinc-aluminum and the temperature is 590°C ± 10°C; and / or

[0064] When the molten metal in the galvanizing pot is aluminum-silicon and the temperature is 690°C ± 10°C, the bushing 11 is prepared by plasma cladding or laser cladding. The cladding layer powder consists of a bonding phase and a hard phase. Among them, the bonding phase is a cobalt-based alloy, and the hard phase is tungsten carbide. The weight percentage of tungsten carbide is not less than 45%. The microhardness of the obtained wear-resistant layer is HRC 55 - 60. The bearing shell 12 is made of silicon nitride ceramic prepared by hot isostatic pressing. The key index is that the Vickers hardness (HV10) of the silicon nitride ceramic is between 1250 - 1350. The friction pair composed of the bushing 11 and the bearing shell 12 prepared in this way has good wear matching performance.

[0065] The variable setting of the bearing shell 12 in the friction area 13 and the support point 14 on the front and rear stabilizing rollers is specifically as follows:

[0066] The number N1 of the bearing shells 12 in the friction area 13 is 2 or 3;

[0067] The span T1 of the friction area 13 is 90° - 120°;

[0068] The number N2 of the support points 14 is 1;

[0069] The central offset angle T3 of the support point 14 is 15° - 45°.

[0070] The number N1 is the number of fulcrums participating in the friction area 13. For example, Figure 5 there are 2 bearing shells 12 in the friction area 13, or as Figure 6 there are 3 bearing shells 12 in the friction area 13.

[0071] The span T1 is the angle of the friction area 13. For example, Figure 5 the included angle between the center lines of the 2 bearing shells 12 in the friction area 13, or as Figure 6 the included angle between the center lines of the outermost 2 of the 3 bearing shells 12 in the friction area 13.

[0072] The quantity N2 is the number of support points 14 that temporarily play a supporting role when the bushing 11 and the bearing shell 12 disengage within the friction zone 13.

[0073] The central deviation angle T3 is the clockwise angle between the support point 14 and the horizontal line of the bushing 11.

[0074] The variable setting of the center line deviation angle T2 of the friction zone 13 is specifically as follows:

[0075] When the molten metal in the galvanizing pot is zinc, the temperature is 460°C ± 10°C, and N1 = 2, the center line deviation angle T2 of the friction zone 13 = 0°;

[0076] When the molten metal in the galvanizing pot is zinc, the temperature is 460°C ± 10°C, and N1 = 3, the center line deviation angle T2 of the friction zone 13 = 45°;

[0077] When the molten metal in the galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and N1 = 2, the center line deviation angle T2 of the friction zone 13 = 0°;

[0078] When the molten metal in the galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and N1 = 3, the center line deviation angle T2 of the friction zone 13 = 30°;

[0079] When the molten metal in the galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, and N1 = 2, the center line deviation angle T2 of the friction zone 13 = 0°;

[0080] When the molten metal in the galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, and N1 = 3, the center line deviation angle T2 of the friction zone 13 = 15°.

[0081] The initial clearance C1 of the midpoint of the friction zone 13 is 1 - 2 mm, such as Figure 6 the radial distance between the midpoint and the outer circle of the bushing 11 when the three bearing shells 12 in the friction zone 13 are in contact with the outer two points and the bushing 11.

[0082] The radial distance C2 between the support point 14 and the outer circle of the bushing 11 is 1 - 2 mm, which is the radial distance between the support point 14 and the outer circle of the bushing 11 when the bushing 11 is in contact with the friction zone 13.

[0083] Example 1

[0084] In a 460°C zinc pot, the front stabilizing roll can move back and forth, and the position of the rear stabilizing roll is fixed.

[0085] The bushing 11 is prepared by nickel-based alloy + 60% WC plasma cladding, with a microhardness of HRC60, and the bearing shell 12 is silicon nitride ceramic with a Vickers hardness (HV10) of 1300.

[0086] The structural design parameters of the bearing bush 12 of the front stabilizing roll are shown in the following table:

[0087]

[0088] The structural design parameters of the bearing bush 12 of the rear stabilizing roll are shown in the following table:

[0089]

[0090] C1 = 1 mm, C2 = 1 mm.

[0091] The designed shaft sleeves 11 and bearing bushes 12 of the front and rear stabilizing rolls have a service life of more than 35 days and operate stably in actual use.

[0092] Example 2

[0093] In a 590 °C aluminum-zinc pot, the front stabilizing roll can move back and forth, and the rear stabilizing roll can move back and forth.

[0094] The shaft sleeve 11 is prepared by cobalt-based alloy + 45% WC plasma cladding, with a microhardness of HRC 58, and the bearing bush 12 is silicon nitride ceramic with a Vickers hardness (HV10) of 1300.

[0095] The structural design parameters of the bearing bush 12 of the front stabilizing roll are shown in the following table:

[0096]

[0097] The structural design parameters of the bearing bush 12 of the rear stabilizing roll are shown in the following table:

[0098]

[0099] C1 = 2 mm, C2 = 2 mm.

[0100] The designed shaft sleeves 11 and bearing bushes 12 of the front and rear stabilizing rolls have a service life of more than 28 days and operate stably in actual use.

[0101] Example 3

[0102] In a 690 °C aluminum-silicon pot, the front stabilizing roll can move back and forth, and the position of the rear stabilizing roll is fixed.

[0103] The shaft sleeve 11 is prepared by cobalt-based alloy + 45% WC plasma cladding, with a microhardness of HRC58, and the bearing bush 12 is silicon nitride ceramic with a Vickers hardness (HV10) of 1300.

[0104] The structural design parameters of the bearing bush 12 of the front stabilizing roll are shown in the following table:

[0105]

[0106] The structural design parameters of the bearing bush 12 of the rear stabilizing roll are shown in the following table:

[0107]

[0108] C1 = 2mm, C2 = 2mm.

[0109] In actual use, the bushings 11 and bearing bushes 12 of the front and rear stabilizing rolls designed in this way have a service life of more than 10 days and operate stably.

[0110] In summary, the present invention has a good match for the material characteristics and respective hardness of the friction pairs of the bushings and bearing bushes of the front and rear stabilizing rolls. The bushings are prepared by plasma cladding or laser cladding. The cladding layer powder is composed of a binder phase and a hard phase. The binder phase is a nickel-based or cobalt-based alloy, and the hard phase is tungsten carbide. The microhardness of the wear-resistant layer is HRC55 - 60; the bearing bushes of the front and rear stabilizing rolls are prepared by hot isostatic pressing of silicon nitride ceramics, and the Vickers hardness (HV10) is between 1250 - 1350. In addition, the bearing bushes of the front and rear stabilizing rolls adopt a multi-point tile type radial support structure. In actual work, the roll body and the strip steel of the front and rear stabilizing rolls manufactured by the above measures are always in good contact, with accurate centering, small resistance, which can effectively prevent the poor operation of the roll system and reduce the occurrence of product defects.

[0111] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the scope of the essential spirit of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit, comprising multiple bearing bushes arranged circumferentially around a bushing of a roller body, characterized in that: Multiple of the said bearing shells are arranged circumferentially around the said bearing sleeve to form a friction zone and support points; According to the temperature of the molten metal liquid in the galvanizing pot, the bearing shells in the said friction zone and the said support points are variably arranged.

2. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 1, characterized in that, The temperature of the molten metal liquid in the said galvanizing pot is specifically as follows: The molten metal liquid in the said galvanizing pot is zinc, and the temperature is 460°C ± 10°C; The molten metal liquid in the said galvanizing pot is zinc-aluminum, and the temperature is 590°C ± 10°C; The molten metal liquid in the said galvanizing pot is aluminum-silicon, and the temperature is 690°C ± 10°C.

3. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 2, characterized in that, The variable arrangement of the bearing shells in the said friction zone and the said support points is as follows: The number N1 of the bearing shells in the said friction zone is 2 or 3; The span T1 of the said friction zone is 90° - 120°; The number N2 of the said support points is 1; The central offset angle T3 of the said support points is 15° - 45°.

4. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 3, characterized in that, The variable arrangement of the central offset angle T2 of the said friction zone is as follows: When the molten metal liquid in the said galvanizing pot is zinc, the temperature is 460°C ± 10°C, and N1 = 2, the central offset angle T2 of the said friction zone = 0°; When the molten metal liquid in the said galvanizing pot is zinc, the temperature is 460°C ± 10°C, and N1 = 3, the central offset angle T2 of the said friction zone = 45°; When the molten metal liquid in the said galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and N1 = 2, the central offset angle T2 of the said friction zone = 0°; When the molten metal liquid in the said galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and N1 = 3, the central offset angle T2 of the said friction zone = 30°; When the molten metal liquid in the said galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, and N1 = 2, the central offset angle T2 of the said friction zone = 0°; When the molten metal liquid in the said galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, and N1 = 3, the central offset angle T2 of the said friction zone = 15°.

5. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 4, characterized in that: The initial clearance C1 at the midpoint of the said friction zone is 1 - 2 mm; The radial distance C2 between the said support point and the outer circle of the said bearing sleeve is 1 - 2 mm.

6. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 2, characterized in that: When the molten metal liquid in the said galvanizing pot is zinc, and the temperature is 460°C ± 10°C, the said bearing sleeve is prepared by plasma cladding or laser cladding; The said bearing shells are made of silicon nitride ceramics prepared by hot isostatic pressing.

7. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 6, characterized in that: The cladding layer powder of the said bearing sleeve consists of a binder phase and a hard phase.

8. The multi-point tile type radial bearing support structure for stabilizing rollers before and after a zinc pot in a hot-dip coating unit according to claim 7, characterized in that: The said binder phase is a nickel-based alloy; The said hard phase is tungsten carbide.

9. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line, characterized in that: The weight percentage of the said tungsten carbide is not less than 60%, and the microhardness of the obtained wear-resistant layer is HRC50 - 60.

10. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line according to claim 6, characterized in that: The Vickers hardness of the said silicon nitride ceramics is between 1250 and 1350.

11. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line according to claim 2, characterized in that: When the molten metal liquid in the said galvanizing pot is zinc-aluminum, the temperature is 590°C ± 10°C, and / or When the molten metal liquid in the said galvanizing pot is aluminum-silicon, the temperature is 690°C ± 10°C, the said bearing sleeve is prepared by plasma cladding or laser cladding; The said bearing shells are made of silicon nitride ceramics prepared by hot isostatic pressing.

12. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line according to claim 11, characterized in that: The cladding layer powder of the said bearing sleeve consists of a binder phase and a hard phase.

13. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line according to claim 12, characterized in that: The said binder phase is a cobalt-based alloy; The said hard phase is tungsten carbide.

14. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line according to claim 13, characterized in that: The weight percentage of the tungsten carbide is not less than 45%, and the microhardness of the obtained wear-resistant layer is HRC 55-60.

15. The multi-point tile type radial bearing support structure for the stabilizing rollers before and after the zinc pot of the hot-dip galvanizing line according to claim 11, characterized in that: The Vickers hardness of the silicon nitride ceramic is between 1250 and 1350.

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