JPH04258521A - Roll supporting device in hot dipping bath - Google Patents

Abstract

PURPOSE:To secure sealing performance even if a sealant is worn and to enable stable rotation of a roll in a bath for a long time. CONSTITUTION:In a roll supporting device in a hot dipping bath comprising a shaft 11 for rotatably supporting a roll provided in a hot dipping bath 4, supporting arms 7 for supporting both ends of this shaft and a rolling bearing 9 rotatably supporting the roll around the shaft, between a portion fixed to the roll and the portion fixed to the shaft, a sealant 21 made of a heat-resistant material for preventing invasion of molten metal into the portion where the rolling bearing is placed is prevented, and springs 61, 62 and 63 are inserted adjoining the sealant so as to apply a biased force to the sealant in the axial direction.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is incorporated into a plating processing apparatus for continuously hot-dipping the surface of a long steel plate, and is used to rotatably support a roll for guiding the steel plate. The present invention relates to a roll support device in a hot-dip plating bath.

0002

[Prior Art] When forming a plating layer of another metal on a metal surface, in addition to electrochemical plating, the core metal is immersed in a plating bath in which the other metal is melted. Plating treatment using a plating bath is widely performed.

[0003] With such a hot-dip plating bath, for example,
When galvanizing the surface of a long steel plate, for example, as disclosed in Japanese Utility Model Application No. 61-90852,
This is carried out using a device as shown in the attached Figure 5. A steel plate 1 sent out from an uncoiler (not disclosed) is introduced into a plating tank 4 in which molten zinc 3 is stored while being guided by a suitable conveyance roll 2. The steel plate 1 with molten zinc 3 adhered to its surface is taken out of the plating tank 4 by being folded back by a sink roll 5 provided in the plating tank 4. The steel plate 1a containing the plating treatment agent taken out is cooled and solidified to remove the zinc attached to the surface thereof, and then wound up into a recoiler (not shown). In addition, in the part just before the steel plate 1 comes out of the molten zinc 3, there is a
A pair of support rolls 6, 6 is provided to correct the warpage caused in the sink roll portion and to ensure stability of sheet threading.

As described above, the sink roll 5 and the support roll 6, which rotate while guiding or pressing the steel plate 1 while immersed in the high-temperature molten zinc 3, each have a support arm 7. (or the support arm 8; the same applies hereinafter) is rotatably supported via a rolling bearing 9, for example, as shown in FIG.

Rolling bearings are provided between the inner peripheral surface of the circular hole 10 formed at the tip of the support arm 7 and the outer peripheral surface of both ends of the shaft 11 that supports the sink roll 5 (or support roll 6; the same applies hereinafter). By providing 9, 9, the sink roll 5
rotates with a light force.

[0006] As the rolling bearings 9, 9 are required to have a high degree of heat resistance, it is preferable to use ceramic bearings.

However, in the case of the above-mentioned conventional roll support device in a hot-dip plating bath, the bearings are in direct contact with the plating bath during operation, so lubrication is not achieved properly, and wear such as foreign matter gets caught and wear occurs during operation. There were many times when I had to stop driving.

[0008] In view of the above-mentioned circumstances, the present applicant has previously proposed a roll support device in a hot-dip plating bath that is configured to prevent molten metal from penetrating into the bearing portion during operation (patent application). (Hei 2-199739).

[0009] This roll support device in the hot-dip plating bath is
A hot-dip plating bath consisting of a shaft that rotatably supports a roll provided in the hot-dip plating bath, support arms that support both ends of the shaft, and rolling bearings that rotatably support the roll around the shaft. In the roll support device, a sealing material made of a heat-resistant material is provided between the part fixed to the roll and the part fixed to the shaft to prevent molten metal from entering the part where the rolling bearing is installed. This solves the above problem.

[0010] It has also been proposed that it is preferable to provide a slide portion on a part of the shaft for extending and contracting the shaft.

Furthermore, this roll support device in a hot-dip plating bath includes a rolling bearing that rotatably supports a shaft protruding from the end face of a roll provided in the hot-dipping bath, and a support arm for supporting this rolling bearing. In a roll support device in a hot dip plating bath, the rolling bearing is supported on the support arm via a cylindrical housing, and
The above problem can also be solved by providing a sealing material made of a heat-resistant material between the part fixed to the housing and the part fixed to the shaft to prevent molten metal from entering the part where the rolling bearing is installed. are doing.

[0012] This device uses a contact pressure adjustment member (for example, shape memory alloy, bimetal, etc.) that adjusts the contact pressure between the sealing material and the member facing the sealing material according to dimensional changes caused by temperature changes. This contact pressure adjustment member can adjust the contact pressure to an appropriate value when the temperature rises due to immersion in a hot-dip plating bath.

[0013] By freely supplying compressed gas to the rear side of the sealing material to the part where molten metal is present, even if a gap is formed between the sealing material and the opposing member due to a rise in temperature, the compressed gas will not be supplied. Pressure can prevent molten metal from entering.

In the case of the roll supporting device in a hot-dip plating bath of the present invention constructed as described above, the sealing material prevents molten metal from entering the rolling bearing portion, even if it is immersed in the hot-dip plating bath. Even if the contact pressure between the sealing material and the member facing it may decrease due to temperature rise, this risk is eliminated by contact pressure adjustment members that change in temperature, such as shape memory alloys and bimetals, and compressed gas. . This prevents molten metal from entering the bearing portion during operation and causing problems.

[0015] By providing the sealing material, the contact pressure adjusting member that operates in accordance with temperature changes, and the compressed gas, the frequency of bearing replacement has been reduced considerably compared to the conventional method. It has been found that the contact pressure between the sealing material and the opposing member gradually decreases due to wear, and that there is a limit to the ability to ensure sealing performance using only the above-mentioned contact pressure adjusting member and compressed gas.

[0016]

[Problems to be solved by the invention] The problems to be solved by the present invention are:
To provide a roll support device in a hot-dip plating bath that can ensure sealing performance even when a sealing material is worn out and that stably rotates a roll in the bath for a long period of time.

[0017]

[Means for Solving the Problems] The roll support device in a hot-dip plating bath of the present invention includes a shaft that rotatably supports a roll provided in a hot-dip plating bath, and support arms that support both ends of this shaft. , in a roll support device in a hot-dip plating bath comprising a rolling bearing that rotatably supports the roll around the shaft, the above-mentioned Means configured to provide a sealing material made of a heat-resistant material to prevent molten metal from entering into the rolling bearing installation area, a spring inserted adjacent to the sealing material, and to apply an axial biasing force to the sealing material. By,
The above issues have been resolved.

[0018] It is preferable that a part of the shaft is provided with a slide portion for extending and contracting the shaft.

Furthermore, the apparatus for supporting rolls in a hot-dip plating bath according to the present invention includes a rolling bearing that rotatably supports a shaft protruding from the end surface of a roll provided in a hot-dipping bath, and a rolling bearing for supporting the rolling bearing. In the roll support device in a hot-dip plating bath, the rolling bearing is supported on the support arm via a cylindrical housing, and a portion fixed to the housing and a portion fixed to the shaft are connected to each other. In between, a sealing material made of a heat-resistant material is provided to prevent molten metal from entering into the part where the rolling bearing is installed, and a spring is inserted adjacent to the sealing material so as to apply an axial biasing force to the sealing material. The above problem is solved by means configured as follows.

[0020] A contact pressure adjusting member (for example, shape memory alloy, bimetal, etc.) is provided to adjust the contact pressure between the sealing material and the member facing the sealing material due to dimensional changes caused by temperature changes. The contact pressure adjustment member can adjust the contact pressure to an appropriate value when the temperature rises due to immersion in a hot-dip plating bath.

[0021] By freely supplying compressed gas to the rear side of the sealing material to the part where molten metal is present, even if a gap is formed between the sealing material and the opposing member due to temperature rise,
The pressure of compressed gas can prevent molten metal from entering.

[0022]

[Operation] In the case of the roll support device in a hot-dip plating bath of the present invention constructed as described above, even if the sealing material wears out, the force of the spring prevents the contact pressure between the sealing material and the opposing member from decreasing. The sealing material prevents molten metal from entering the rolling bearing area.

[0023] This further prevents molten metal from entering the bearing portion during operation and causing problems.

[0024] Here, the spring refers to something that generates an elastic biasing force, such as a coil spring or a disc spring.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the roll support device of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a sectional view showing a first embodiment of the present invention. A support cylinder 12 is fitted and fixed inside a circular hole 10 formed at the tip of the support arm 7, and the end of the shaft 13 is fitted inside the support cylinder 12, and a sleeve 14 which also serves as a spring case is fitted inside the support cylinder 12.
It is supported and fixed through. The inner ring 17 of the rolling bearing 9 made of a material with a high degree of heat resistance, such as ceramic, is located near the end of the shaft 13, which is configured to be slightly expandable and retractable by providing a slide portion 16 in the intermediate portion. Fixed externally. On the other hand, short cylindrical holding cases 18a and 18b, which are connected to each other by bolts 15, are fixed to the end openings of the roll 5, which is rotatably provided around the shaft 13. The outer ring 19 of the rolling bearing 9 is fitted and fixed to the end of the holding case 18a near the roll 5.

Inner peripheral surfaces of both holding cases 18a and 18b,
Seal members 21 and 21 made of a heat-resistant material are respectively installed between the outer circumferential surfaces of sleeves 20a and 20b fitted onto the shaft 13, and a spring 61 is inserted adjacent to each seal member 2.
The inner circumferential edges of sleeves 1 and 21 are brought into sliding contact with the outer circumferential surfaces of sleeves 20a and 20b. The sealing materials 21, 21 are string-like materials made of striped heat-resistant fibers such as silicate.
Those having heat resistance of about 000° C. can be preferably used.

A support flange 22 is fixed to the open end of the case 18b on the side away from the roll 5, and a locking groove 23 is formed on the outer surface of the support flange 22 (the right side in FIG. 1).
, 23 are respectively fitted with sealing materials 24, 24 made of a heat-resistant material, and a spring 62 is inserted adjacent thereto. Of the pair of sleeves 20a, 20b, a receiving flange 25 is formed on the outer peripheral surface of the intermediate portion of the sleeve 20b on the side away from the roll 5, and a sealing material 24 is formed on the inner surface of this receiving flange 25.
, 24 are in sliding contact.

The sleeve 20b is supported on the outer peripheral surface of the shaft 13 so as to be able to move slightly in the axial direction. An engaging protrusion 26 is formed on the outer edge of the sleeve 20b over its entire circumference. A sealing material 27 also made of a heat-resistant material is attached to the inside of this engaging protrusion 26, and a spring 63 is inserted adjacent to this. Furthermore, the engagement protrusion 26 includes:
A restraining ring 28 having a substantially J-shaped cross section is fitted onto the outside, and this restraining ring 28
The sealing material 27 can be pressed freely at the inner edge of the inner edge.

A compression spring 30 is attached to each of the holding holes 29 formed at a plurality of locations in the circumferential direction of the sleeve 14, and the compression spring 30 holds the restraining ring 28 against the spacer 31.
is being pressed through. As a result, the inner circumferential edge of the sealing material 27 is pressed against the outer circumferential surface of the shaft 13, and the side edge of the sealing material 24 is pressed against the side surface of the receiving flange 25, respectively, with a force corresponding to the elasticity of the compression spring 30.

Further, compressed gas can be freely supplied to a ventilation path 32 formed from the end face of the shaft 13 inside the shaft 13 from a compressed gas source (not shown) such as a compressor. A through hole 33a is provided between the ventilation passage 32 and the rear side of the sealing material 24 (the side opposite to the part where the molten metal is present, with the sealing material 24 as a boundary); A through hole 33b is formed between the sealing material 24, 27, and the compressed gas can be freely sent to the rear side of each sealing material 24, 27.

In the case of the roll support device in a hot-dip plating bath of the present invention constructed as described above, the roll rotates around the shaft 13 along with the rolling elements forming the rolling bearing 9.

As the roll 5 rotates, the inner circumferential edge of the sealing material 21 becomes closer to the outer circumferential surface of the sleeves 20a, 20b, and the outer edge of the sealing material 24 becomes closer to the inner surface of the receiving flange 25. The inner circumferential edge is in sliding contact with the outer circumferential surface of the shaft 13, and prevents molten metal existing around it from entering the rolling bearing 9 portion.

Furthermore, in the case of this embodiment, the sealing material 24,
Compressed air is sent to the rear side of 27, and the spring 6
1, 62, and 63 press against the sealing materials 21, 24, and 27, the pressure difference between the two sides of each of the sealing materials 21, 24, and 27 is small (or there is no pressure at all, or the pressure on the rear side is high). Intrusion of molten metal into the rolling bearing 9 portion is more reliably prevented.

[0035] Problems are less likely to occur in the bearing portion during operation, and stable rotation of the rolls can be ensured over a long period of time.

[0036] The roll 5 is placed in the molten zinc 3 of the plating tank 4 (Fig.
), there is a difference in the amount of thermal expansion of both members 5 and 13 based on the temperature difference between the roll 5 and the shaft 13.
In the illustrated embodiment, the shaft 13 is made expandable and retractable by the sliding portion 16 formed at its intermediate portion, so that no unreasonable force is applied to the supporting portion of the roll 5, regardless of the difference in the amount of thermal expansion. do not have.

Next, FIG. 2 shows a second embodiment of the present invention.

In the first embodiment described above, the force for pressing the outer edge of the sealing material 24 against the inner surface of the receiving flange 25 and the force for pressing the inner peripheral edge of the sheet material 27 against the outer peripheral surface of the shaft 13 are different from each other. were obtained by the elasticity of the compression spring 30, whereas in this embodiment, these forces are obtained by the contact pressure adjusting member 35 whose dimensions change with temperature changes.

[0039] Between the pair of sealing materials 36, 36 fitted inside the outer half of the sleeve 20b, there is a contact pressure adjustment member made of shape memory alloy, bimetal, etc., which increases the width dimension W when the temperature rises. The member 35 is held between them. The end opening of the sleeve 20b is closed by a spacer 37.
is pressed toward the sleeve 20b by a nut 38 screwed onto the end of the shaft 13.

As a result, in the case of this embodiment, when the contact pressure adjusting member 35 increases in temperature due to immersion in the hot-dip plating bath, the width dimension W of the contact pressure adjusting member 35 is increased, so that the pair of sealing members 36 and the outer circumferential surface of the shaft 13 is made sufficiently high, and at the same time, the outer edge of the sealing material 24 supported on the outer surface of the support flange 22 is brought into sufficiently strong contact with the inner surface of the receiving flange 25. Let them come into contact with you.

Other structures and functions are the same as those of the first embodiment, so the same parts are given the same reference numerals and redundant explanations will be omitted.

Next, FIG. 3 shows a third embodiment of the present invention.

The outer ring 19 constituting the rolling bearing 9 is fitted and supported in a short cylindrical housing 39. The outer periphery of both ends of the housing 39 is provided with outward flanges 4, respectively.
0, and the portion between both outward flanges 40, for example,
With a structure as disclosed in Utility Application No. 1-120536, it is supported at the tip of the support arm 7 (FIG. 5). In the illustrated embodiment, on the outer peripheral surface of the housing 39,
By making the portion between the pair of outward housings 40 spherical, a self-centering function is provided when the housing is supported at the distal end of the support arm 7.

The inner ring 17 of the rolling bearing 9, which has the housing 39 as described above provided on the outside thereof, is externally fitted and fixed to the end of the shaft 41 protruding from the end face of the roll. The outer edge of a cylindrical sleeve 42 is fitted inside the small diameter portion 41a formed at the end of the shaft 41, and the outer end of the sleeve 42 is fitted onto the end of the small diameter portion 41a,
The inner ring 17 is held between the inner end edge of a bottomed cylindrical sleeve 44 fixed to the small diameter portion 41a by a bolt 43.

At both ends of the inner peripheral surface of the housing 39, the outer ring 1
Seal members 46 are attached to the positions sandwiching 9 through retaining rings 45, respectively. A restraining ring 47 is fixed to each end face of the housing 39, and the restraining rings 47 prevent the outer ring 19 and the retaining ring 45 from coming off from inside the housing 39. Both sides of the sealing material 46 are supported by support walls 48 and 49 formed on the inner peripheral surfaces of the respective retaining rings 45 and 45 and the restraining ring 47.

Cap nuts 50 are screwed onto the outer surfaces of the restraining rings 47, respectively. Seal members 51, 51 are supported inside each cap nut 50, and the inner peripheral edges of each seal member 51 are brought into sliding contact with the outer peripheral surfaces of sleeves 42, 44, respectively.

Furthermore, the restraining ring 47 is formed with a through hole 52 that passes through the inner peripheral surface and the outer peripheral surface of each restraining ring 47.
Compressed air can be freely supplied to the rear side of the sealing material 51 through each through hole 52.

In this embodiment, a sealing material 46 and a spring 61 are inserted between the support walls 48 and 49, and a sealing material 51 is inserted between the inner surface of the cap nut 50 and the inner surface of the restraining ring 47.
and a spring 62 are inserted. The springs 61 and 62 bias the seal members 46 and 51 in the axial direction.

In the case of this embodiment, as the rolling elements 34 constituting the rolling bearing 9 roll, the shaft 41 rotates inside the housing 39, and the roll 5 supported by the shaft 41 (FIG. 5) etc. rotate.

As the roller rotates, the sealing material 46,
The inner circumferential edge of the sleeve 51 is in sliding contact with the outer circumferential surface of the sleeves 42 and 44, and prevents molten metal existing around the sleeve from entering the rolling bearing 9 portion.

Compressed air is sent to the rear side of the sealing materials 46, 51, and the springs 61, 62 are connected to the sealing materials 46, 51.
51, the intrusion of molten metal into the rolling bearing 9 portion is more reliably prevented.

[0052] Therefore, problems with the bearing portion do not occur during operation, and the roll can rotate stably for a long period of time.

In each of the embodiments described above, the sealing material 21
Alternatively, the position of the spring 61 that presses the spring 46 may be reversed. For example, as shown in FIG. 4, the positions of the spring 61 and the sealing material 46 may be interchanged in the axial direction.

In this case, it is preferable to provide a passage 71 so that the compressed air communicates with the spring 61 side (FIG. 4).

[0055]

[Effects of the Invention] The device for supporting rolls in a hot-dip plating bath according to the present invention is constructed and operates as described above, but the molten metal does not intrude into the rolling bearing portion for rotatably supporting the rolls. , the life of the bearing can be extended, and stable operation of the plating equipment is possible.

[Brief explanation of the drawing]

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

FIG. 2 is a sectional view showing a second embodiment of the invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a modification of the embodiment of FIG. 3;

FIG. 5 is a schematic vertical cross-sectional view showing an example of a conventional plating apparatus using a hot-dip plating bath.

[Fig. 6] 6 of Fig. 5 showing an example of a conventional roll support device.
A diagram corresponding to the −6 cross section.

[Explanation of symbols]

1, 1a: steel plate,
2: Conveyance roll, 3: Molten zinc, 4
: Plating bath, 5: Sin roll
6: Support roll, 7, 8: Support arm,
9, 9a: Rolling bearing, 10: Circular hole, 11: Shaft, 12
: Support tube,
13: Shaft, 14: Sleeve, 15: Bolt, 16:
Slide part, 17:
Inner ring, 18a, 18b: Holding case, 19
: Outer ring, 20a, 20b: Sleeve,
21: sealing material, 22: support flange,
23: Locking groove, 24: Seal material,
25: Receiving flange, 2
6: Engagement protrusion, 27
: sealing material, 28: restraining ring,
29: holding hole, 30: compression spring,
31: Maza, 32:
ventilation path, 3
3, 33a, 33b: through hole, 34: rolling element,
35: contact pressure adjustment member, 36: sealing material,
37: Spacer, 38: Nut, 39: Housing, 4
0: outward flange, 41
: shaft, 41a: small diameter part,
42: Sleeve, 43: Bolt,
44: Sleeve, 45: Retaining ring, 46:
Seal material, 47: Retainer ring,
48, 49: Support wall, 50: Cap nut,
51: sealing material, 52: through hole,
53, 54:
Seal materials 61, 62, 63: springs.

Claims (5)

[Claims] 1. A shaft that rotatably supports a roll provided in a hot-dip plating bath, a support arm that supports both ends of the shaft, and a rolling bearing that rotatably supports the roll around the shaft. A roll support device in a hot-dip plating bath consisting of a heat-resistant material between the part fixed to the roll and the part fixed to the shaft to prevent molten metal from entering the part where the rolling bearing is installed. A roll support device in a hot-dip plating bath, characterized in that a sealing material is provided, a spring is interposed adjacent to the sealing material, and an axial biasing force is applied to the sealing material. 2. The roll support device in a hot-dip plating bath according to claim 1, wherein a part of the shaft is provided with a slide portion for extending and contracting the shaft. 3. A roll support device in a hot-dip plating bath, comprising a rolling bearing that rotatably supports a shaft protruding from the end face of a roll provided in the hot-dip plating bath, and a support arm for supporting the rolling bearing. The rolling bearing is supported by the supporting arm via a cylindrical housing, and molten metal is applied to the rolling bearing installation part between the part fixed to the housing and the part fixed to the shaft. A roll support device in a hot-dip plating bath, characterized in that a sealing material made of a heat-resistant material is provided to prevent the infiltration of metal, a spring is interposed adjacent to the sealing material, and an axial biasing force is applied to the sealing material. . 4. A contact pressure adjustment part is provided to adjust the contact pressure between the sealing material and the member facing the sealing material due to dimensional changes due to temperature changes, and this contact pressure adjustment member is made of The roll support device in a hot-dip plating bath according to any one of claims 1 to 3, wherein the contact pressure is set to an appropriate value when the temperature rises due to immersion in the plating bath. 5. Claim 1, wherein compressed gas can be freely supplied to the rear side of the sealing material to the part on which the molten metal depends.
5. The roll support device in a hot-dip plating bath according to any one of items 1 to 4.