JP3976607B2 - Sealing device for continuous casting machine roll neck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device suitably used for site particularly high water resistance as the roll neck side of the conveying segments roll continuous casting machine is required.
[0002]
[Prior art]
A conventional sealing device is shown in FIG.
[0003]
In the figure, the case 40 has a through hole 46 that penetrates in a substantially horizontal direction. A rotating shaft 50 such as a segment roll is rotatably supported in the through hole 46 of the case 40 via a bearing device 60.
[0004]
The bearing device 60 includes an outer ring 52, a plurality of tapered rollers 53, two cages 54, and two inner rings 56.
[0005]
The sealing devices 12 and 13 are disposed on both sides in the axial direction of the bearing device 60 on the inner periphery of the case 40, and the sealing device 12 is disposed on the shaft end side and the sealing device 13 is disposed on the other side. Yes. The sealing devices 12 and 13 are attached to inner peripheries of seal covers 42 and 43 attached to both ends of the case 40, respectively.
[0006]
The sealing devices 12 and 13 are configured such that the core metal is press-fitted into the inner peripheral surface of the case 40 and the lip is brought into contact with the outer peripheral surface of the rotating shaft. By these sealing devices 12 and 13, the opposed annular space between the case 40 and the rotating shaft 50 is separated from the external space and sealed.
[0007]
Incidentally, the bearing device 60 is regularly filled with a lubricant such as grease. In this compensation, grease is press-fitted into the bearing device 60 from the grease injection port 57 provided on the sealing device 12 side. This grease compensation is performed in accordance with the grease press-fitting. Is carried out until it is discharged to the outside. That is, it is determined that the grease has been sufficiently compensated by this discharge, and the grease compensation is stopped.
[0008]
Therefore, the sealing device 12 has a structure that prevents the grease inside the bearing device 60 from being discharged, and the sealing device 13 allows the grease inside the bearing device 60 to be discharged while preventing foreign matter from entering from the outside. It is like that.
[0009]
As shown in FIG. 10, the sealing device 12 has a structure in which the replenished grease is blocked inside the bearing device 6 and does not leak outside.
[0010]
As shown in FIG. 11, the sealing device 13 has a configuration in which two types of seals 91 and 92 are combined to prevent foreign matter from entering from the outside. The seals 91 and 92 both open the lips 93 and 94 of the seals 91 and 92 due to a rise in pressure inside the bearing device 60 when grease is injected. It is designed to leak.
[0011]
[Problems to be solved by the invention]
By the way, the conventional sealing device 13 is configured to allow the grease inside the bearing device 60 to be discharged from the inner diameter side as described above. However, when grease is refilled, the inside of the bearing device 60, particularly the upper side of the sealing device 13 is used. Since new grease is discharged without spreading, old grease always remains in the upper part of the sealing device 13 even if the grease is regularly replenished, and the new grease cannot be replaced. It was.
[0012]
Accordingly, an object of the present invention is to provide a sealing device having a structure capable of replenishing grease over a wide area in a sealed object while allowing the grease to be discharged when replenishing the grease.
[0013]
[Means for Solving the Problems]
The sealing device according to the present invention includes an inner seal on a grease-filled side in an annular space between a case having a through hole penetrating in the horizontal direction and a rotating shaft that is rotatably inserted into and supported by the through hole of the case. And a sealing device for a roll neck of a continuous casting machine that is partitioned into a grease-filled space and an external space by partitioning in an axial direction by an outer seal on the outer space side, and an inner seal is attached to the case and rotates. An annular core that is opposed to the outer peripheral surface of the shaft through a predetermined gap, and is attached to the grease-filled space side on the inner diameter side of the annular core and from the grease-filled space to the outer peripheral surface of the rotary shaft and a lip wherein the contact facing greased space side so as to prevent grease runoff, high in the circumferential direction in the upper half of the annular plate portion of the annular core metal of the inner seal area Provided grease outlet channel to allow the outflow of the grease to the outside space side from the grease enclosed space at a position one place made is, the grease outlet channel is provided through the annular plate portion of the annular core metal in the axial direction A through-hole and an elastic body attached to the inner surface of the annular metal core on the grease-filled space side in a state of closing the through-hole, and the elastic body has a grease amount in the grease-filled space of a predetermined amount or more. A slit is provided which is elastically deformed only when the level is reached and allows passage of grease.
[0014]
The term “horizontal” does not mean that strict leveling is required, but means that a slight inclination is allowed with respect to the theoretical level.
[0015]
In short, in the sealing device of the present invention, since the grease outflow path is provided in the upper half region of the annular core metal, the grease blocked by the lip gradually accumulates from the lower half of the grease filled space, When the water reaches the level where the outflow path is located, the grease is discharged to the external space side. Therefore, the old grease is easily replaced with new grease, and the new grease is easily distributed over a wide area in the grease enclosure space.
[0017]
In particular, since the grease outflow path is provided at a position higher in the circumferential direction of the annular plate portion, which is a portion along the radial direction of the annular core metal, the grease is discharged from a higher position along the radial direction of the sealing device. As a result, it is difficult for old grease to accumulate near the outer diameter of the sealing device. Therefore, it becomes easy to sequentially replace the old grease with the new grease in the grease-filled space, and the new grease can be filled over a wider area inside the grease-filled space.
[0019]
In the present invention, when the grease fills the inside of the grease enclosure space, the elastic body that closes the through hole of the annular cored bar opens at the slit portion due to its elastic characteristics. Therefore, the elastic body serves as a valve, and the grease can be discharged little by little while preventing the entry of foreign matter from the outside.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0023]
1 to 3 show Embodiment 1 of the present invention.
[0024]
1 is a cross-sectional view of the upper half showing the actual use state of the sealing device, FIG. 2 is a cross-sectional view of the upper half of the sealing device, and FIG. 3 is a view taken in the direction (3) of FIG.
[0025]
Here, prior to the description of the sealing device 1 according to the present invention, an example of its use will be described with reference to FIG.
[0026]
The sealing device 1 is disposed on the side of a bearing device 6 that rotatably supports a rotary shaft 5 such as a transport segment roll of a continuous casting machine.
[0027]
The rotating shaft 5 is rotatably supported via a bearing device 6 with respect to a through hole 47 provided in the case 4 and penetrating in a substantially horizontal direction. Note that “substantially horizontal” means that a slight inclination is allowed with respect to the theoretical horizontal, and does not mean that strict leveling is required.
[0028]
The bearing device 6 includes an outer ring 62, a plurality of tapered rollers 63, two cages 64, and two inner rings 66.
[0029]
The sealing devices 1 and 11 are arranged on both sides in the axial direction of the bearing device 6 on the inner periphery of the case 4, and are respectively attached to the inner periphery of seal covers 44 and 45 attached to both ends of the case 4.
[0030]
By these sealing devices 1 and 11, the opposed annular space between the case 40 and the rotating shaft 50 is partitioned from the external space and sealed.
[0031]
As described above, the bearing device 6 sealed by the sealing devices 1 and 11 is periodically filled with a lubricant such as grease through the grease injection port 67.
[0032]
The sealing device 11 has the same structure as the sealing device 12 of FIG. 10 shown in the conventional example, and has a structure in which the supplemented grease is blocked inside the bearing device 6 and does not leak to the outside.
[0033]
Next, the sealing device 1 according to the first embodiment will be described.
[0034]
The sealing device 1 is hermetically sealed even if it is used at a site where a large amount of water for cooling the casting to be transported is sprinkled, such as a bearing device for a conveying segment roll of a continuous casting machine as described above. So that the two types of seals 2 and 3 are combined.
[0035]
The inner seal 2 has a configuration in which first and second lips 26 and 27 made of an elastic body such as synthetic rubber are attached to a metal annular cored bar 21 having a substantially inverted L shape in cross section.
[0036]
The annular cored bar 21 includes a cylindrical portion 23 and an annular plate portion 24 extending downward in the radial direction from one axial end side thereof.
[0037]
The lip 26 is attached so as to extend while reducing the diameter outward in the axial direction with respect to the inner peripheral edge of the annular plate portion 24 of the annular cored bar 21. The lip 26 is brought into contact with the rotating shaft 5 to form a contact seal. A coil spring 26 a is mounted on the inner peripheral side of the tip of the lip 26 and presses the lip 26 against the rotating shaft 5.
[0038]
The lip 27 corresponds to the lip described in the claims, and prevents the grease from flowing out in a form extending while reducing the diameter inward in the axial direction with respect to the inner peripheral edge of the annular plate portion 24 of the annular metal core 21 of the inner seal 2. It is deposited at the contact angle. The lip 27 is brought into contact with the rotating shaft 5 to form a contact seal.
[0039]
The lip 27 provided in such a form serves to prevent leakage of the grease to the outside and to block the inside of the bearing device 6 when the bearing device 6 is filled with grease.
[0040]
An elastic body 22 made of the same material as that of the lip 26 is also applied to a region extending from the outer periphery of the annular cored bar 21 to the lip 26 through the inner surface, and in particular, a portion attached to the outer peripheral surface of the cylindrical portion 23. Serves as a gasket.
[0041]
The outer seal 3 has a configuration in which first to third lips 35 to 37 made of an elastic body such as synthetic rubber are attached to an annular metal core 31 having a substantially inverted L shape in cross section.
[0042]
The annular core bar 31 includes a cylindrical portion 33 and an annular plate portion 34 that extends downward in the radial direction from one axial end thereof. The annular core 31 is press-fitted into the inner periphery of the cylindrical portion 23 of the annular core 21 of the inner seal 2 in the opposite direction to the annular core 21 of the inner seal 2.
[0043]
The lip 35 is attached to the inner peripheral edge of the annular plate portion 34 of the annular metal core 31 so as to extend while reducing the diameter outward in the axial direction. The lip 35 is brought into contact with the rotary shaft 5 to form a contact seal.
[0044]
The lips 36 and 37 are attached so as to extend outward in the axial direction from the outer peripheral edge and the inner peripheral edge of the annular plate portion 34 of the annular core 31. Lips 36 and 37 abut against wall 41 to create a contact seal.
[0045]
Here, the characteristic of said sealing device 1 is demonstrated. In other words, when the bearing device 6 is refilled with grease, the old grease inside the bearing device 6 is discharged so that new grease can be filled over a wide area inside the bearing device 6. Therefore, the grease is not discharged from the inner diameter side of the inner seal 2 and the grease discharge is allowed from the middle of the inner seal 2 in the radial direction.
[0046]
A grease outflow passage with a valve function that allows grease discharge is provided in the middle of the upper half of the inner seal 2 in the radial direction. In other words, the through hole 28 for discharging the grease is provided at the 12 o'clock position of the annular plate portion 24 of the annular metal core 21 in terms of timepiece.
[0047]
The inner opening of the through hole 28 is closed by the elastic body 22. The closed portion of the through hole 28 is referred to as a lid 20.
[0048]
The lid 20 is provided with a slit 29.
[0049]
When the inner seal 2 as described above is used in the sealing device 1, the grease outflow path is provided at the twelve o'clock position in terms of timepiece, so that the grease blocked by the lip 27 is released from the lower half inside the bearing device 6. When the grease gradually accumulates and reaches the level where the grease outflow path is located, the grease is discharged to the outside of the bearing device 6. Therefore, the old grease is easily replaced with new grease one after another, and the new grease is easily distributed over a wide area inside the bearing device 6.
[0050]
Further, due to the elastic characteristics of the lid 20 constituted by the elastic body 22, the slit 29 is opened when the grease is filled in the bearing device 6. Therefore, the lid 20 provided with the slit 29 serves as a valve, and the grease can be discharged little by little while preventing foreign matter from entering from the outside.
[0051]
It should be noted that the opening of the through hole 28 may have various shapes, and the size, arrangement, and number of installations can be variously changed. Further, the slit 29 of the lid 20 may be formed in a cross shape, a plurality of cuts may be formed, or an infinite number of small holes may be formed. Moreover, if the through hole 28 is made minute, the lid 20 may not be provided.
[0052]
4 to 8 show another embodiment as a reference example of the present invention. 4 and 5 relate to Embodiment 2 of the present invention, FIG. 4 is a cross-sectional view of the upper half of the sealing device according to Embodiment 2 of the present invention, FIG. 5 shows the main part of FIG. (A) is sectional drawing, FIG.5 (b) is (B)-(B) sectional drawing of Fig.5 (a).
[0053]
In the sealing device 1 of the second embodiment, the configuration different from the first embodiment is only the difference in the configuration that allows the outflow of grease, and the other configurations are basically the same.
[0054]
Here, the grease outflow passage is provided on the outer diameter side of the inner seal 2.
[0055]
Specifically, a through-hole 8 penetrating in the radial direction is provided in one upper portion on the base side in the cylindrical portion of the inner seal 2.
[0056]
Then, in the elastic body 22 attached to the outer periphery of the inner seal 2, the sealing target side has a small diameter, and a cylindrical gap 81 is provided between the case 4 and the case 4.
[0057]
Further, a fan-shaped notch 39 is provided in an angle range corresponding to the through hole 8 on the free end side of the cylindrical portion 33 in the annular core 31 of the outer seal 3.
[0058]
That is, the cylindrical gap 81, the through hole 8, and the notch 39 constitute the grease outflow passage.
[0059]
In the second embodiment configured as described above, the through hole 8 on the outer diameter side of the annular core metal 21, the cylindrical gap 81 provided between the cylindrical portion of the inner seal 2 and the case, and the annular core of the outer seal 3 The grease is discharged from the outer diameter side of the sealing device 1 through the notch 39 of the cylindrical portion 33 in the gold 31. For this reason, it is difficult for old grease to accumulate near the outer diameter of the sealing device 1. Therefore, it becomes easy to sequentially replace the old grease with the new grease in the bearing device 6, and the new grease can be filled in almost the entire area inside the bearing device 6.
[0060]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
(1) The use object of the present invention is not limited to the segment roll of a continuous casting machine.
(2) The present invention includes those in which the inner seal 2 is used alone.
(3) In the present invention, as shown in FIGS. 6 and 7, a part of the inner seal 2 may be cut through the axial direction, and the grease may be discharged therefrom.
[0061]
Specifically, a notch 9 penetrating in the axial direction is provided at one location on the radially inner side of the upper half of the lip 27 of the inner seal 2. Thereby, since the discharge amount of the grease inside the bearing device 6 can be limited to a small amount, the same effect as the above embodiment can be obtained.
[0062]
Further, as shown in FIG. 8, the notch 9 may be closed by providing a thin weir portion 90 in the axial direction. In this way, when the grease is discharged, these dam portions 90 bend and allow the grease to flow out, while preventing entry of foreign matter from the outside.
[0063]
【The invention's effect】
As described above, in the sealing device of the present invention, when replenishing the grease in the grease-filled space, the lip is provided on the inner diameter of the sealing device to stop the grease, and then the grease is accumulated from the lower part of the sealing device, The grease is discharged after it has accumulated to the top of the sealing device. Therefore, old grease does not remain on the upper side of the sealing device, and it becomes easy to sequentially replace old grease with new grease, and new grease can be filled over a wide area inside the grease filling space.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an upper half showing an actual use state of a sealing device. FIG. 2 is a cross-sectional view of an upper half of a sealing device according to Embodiment 1 of the present invention. Figure as another reference example of FIG. 4] this cross-sectional view of the upper half of a sealing device according to the second embodiment of the reference example of the invention Figure 5 is a cross-sectional view of a main part of FIG. 4 [6] the present invention FIG. 7 is a cross-sectional view of the upper half of a sealing device according to another embodiment. FIG. 7 is a view taken in the direction of the arrow (8) in FIG. 6. FIG. 8 is a seal according to still another embodiment as still another reference example of the invention. 9 is a cross-sectional view of the upper half of the device. FIG. 9 is a cross-sectional view of the upper half of the conventional sealing device in actual use. FIG. 10 is a cross-sectional view of the upper half of the sealing device on the shaft end side in FIG. Sectional drawing of the upper half which shows the sealing device of the other side of FIG.

Claims (1)

An annular space between a case having a through hole penetrating in the horizontal direction and a rotating shaft that is rotatably inserted into and supported by the through hole of the case is divided into an inner seal on the grease-filled side and an outer space on the outer space side. A continuous casting machine roll neck sealing device that is partitioned in the axial direction by a seal and separated into a grease-filled space and an external space,
The inner seal is attached to the case and attached to the grease-filled space side on the inner diameter side of the annular cored bar, which is opposed to the outer peripheral surface of the rotating shaft via a predetermined gap, and is A lip that is brought into contact with the grease-filled space so as to prevent grease from flowing out of the grease-filled space with respect to the outer peripheral surface of the shaft;
A grease outflow path that allows the outflow of grease from the grease-filled space to the external space side is provided at one position that is higher in the circumferential direction in the upper half region of the annular plate portion of the annular core of the inner seal,
The grease outflow path is attached to the inner surface of the annular cored bar on the grease-filled space side with a through hole provided in an axial direction through the annular plate portion of the annular cored bar and closing the through hole. For continuous caster roll necks that are formed of an elastic body and that are provided with a slit that elastically deforms and allows the passage of grease only when the amount of grease in the grease-filled space reaches a predetermined level or more . Sealing device.

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