JP4106168B2 - Airtight device for large diameter rotating body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes, for example, a rotary kiln, a rotary cooler, a rotary dryer and the like used in industrial waste treatment facilities, cement, alumina, coke, limestone and other production facilities, and a fixing member disposed around the rotary member. The present invention relates to an airtight device for a large-diameter rotating body that performs gas sealing.
[0002]
[Prior art]
A rotary kiln, a rotary cooler, or the like is an inclined rotating cylindrical device that moves an internal charge to the downstream side in the axial direction by rolling and heats it by exchanging heat with gas. In order to control internal combustion, air intrusion from the outside is prevented by air-sealing the inlet and outlet. As a method of this air seal, a method using a labyrinth seal, or a method using a seal plate having elasticity at a seal portion is proposed in, for example, Japanese Utility Model Publication No. 57-63157. In addition, as described in Japanese Patent Publication No. 5-71869, a sealing device in which a large number of spring members are partially overlapped and arranged annularly has been proposed.
However, the labyrinth seal alone does not provide a sufficient sealing action, and the amount of intrusion air is large, making combustion control difficult. In the air seal device described in Japanese Utility Model Publication No. 57-63157, there is no particular problem when the rotating body is a perfect circle. However, when the rotating body has a large diameter, the outer peripheral surface is generally uniform. However, there was a problem that air leaked due to a gap. Furthermore, even in the sealing device described in Japanese Patent Publication No. 5-71869, there is air leaking from a large number of spring members, and the seal may be insufficient depending on the device used.
[0003]
In order to compensate for the drawbacks of these inventions, the present applicant has disclosed an airtight device 70 shown in FIG. 6 in Japanese Patent Application Laid-Open No. 09-079756. The hermetic device 70 has a roller chain 72 wound around a circumferential surface of a large-diameter rotating body 71, and has an elastic seal member 73 having a ring shape and an L-shaped cross section. The elastic seal member 73 has an outer end attached to a fixing member 74 arranged with a gap on the outer side in the radial direction of the large-diameter rotating body 71, and an inner end slid on the peripheral surface of the large-diameter rotating body 71. Touching. The intermediate portion is fixed to the L-shaped link plate 75 of the roller chain 72 via mounting brackets 76 and 77. With this configuration, the sealing can be performed following the irregularities on the peripheral surface of the large-diameter rotating body 71.
[0004]
[Problems to be solved by the invention]
However, in the conventional airtight device, when the internal pressure of the rotary kiln or the like rises, gas may be ejected from the inside of the large-diameter rotating body 71 to the outside through the seal portion. Further, since the large-diameter rotating body 71 is large and heavy, the force applied to the sealing material is increased, and the seal life is short.
This invention is made | formed in view of this situation, and it aims at providing the airtight apparatus of the large diameter rotary body which can prevent the ejection of an internal gas and can lengthen the lifetime of a sealing material.
[0005]
[Means for Solving the Problems]
An airtight device for a large-diameter rotating body according to the present invention that meets the above-mentioned object is an airtight seal that seals between a large-diameter rotating body that is driven by a drive source and a fixing member that is provided with a small gap around it An inclined ring member provided with a sliding portion provided in a cross-sectional mountain shape on the outer periphery of the large-diameter rotating body and previously surface-treated as a pair, and an apparatus positioned radially outward of the inclined ring member And an annular seal member that is provided by being overlapped with the fixing member in the axial direction via an attachment ring member and that presses each radially inner end portion against each sliding portion of the inclined ring member.
Since it has the annular seal member by which each inner side edge part is pressed by the sliding part used as a pair, it can prevent that a gas blows outside at the time of a positive pressure by making a seal part double. In addition, since the sliding part is formed in a cross-sectional mountain shape, the pressing direction by the overlapping annular seal member can be dispersed on both sides of the ridge line direction, and the sliding resistance force applied to the large-diameter rotating body is made even during operation. It is possible to prevent the seal member from tilting or twisting.
[0006]
Here, the annular sealing member may be configured by covering a plate-like elastic body with a sealing material.
As the plate-like elastic body, for example, rubber (preferably heat-resistant rubber), flexible plastic, metal plate, or the like can be used. As the sealing material, for example, a material having wear resistance and heat resistance such as asbestos can be used. Covering a flexible plate-like elastic body with a sealing material with excellent wear resistance allows a constant pressure to be stably applied to the seal part, reduces wear caused by sliding, and provides plate-like elasticity. The life of the annular seal member can be extended by preventing heat from being transmitted directly to the body.
[0007]
In the airtight device for a large-diameter rotating body according to the present invention, it is also possible to continuously or intermittently supply the lubricant to the sliding portion via a greasing pipe. Since the lubricant is supplied, the sliding resistance can be reduced and the life of the annular seal member can be extended.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
As shown in FIGS. 1 and 2, the large-diameter rotating body hermetic device 10, 11 according to the first embodiment of the present invention has a large-diameter transversely driven by a drive source (not shown) of the rotary kiln 29. This is a device that seals between the rotating body 12 and the fixing member 13 provided with a small gap around the rotating body 12.
First, with reference to FIG. 2, the structure of the rotary kiln 29 which applies the airtight apparatuses 10 and 11 is demonstrated. 1 to 3, the left side is the upstream side and the right side is the downstream side.
A screw feeder 30 for supplying the raw material to the large-diameter rotator 12 is provided at a position upstream of the large-diameter rotator 12 of the fixing member 13 surrounding the large-diameter rotator 12. A burner 31 for heating the raw material in 12 is provided. Sprockets 32 and 33 for transmitting torque from the drive source to the large-diameter rotary body 12 and a chain (not shown) are provided at the center of the lower portion of the fixing member 13 on which the peripheral surface of the large-diameter rotary body 12 is placed. In addition, driven rollers 34 and 35 for rotatably supporting the large-diameter rotating body 12 are provided on the downstream side, respectively.
The large-diameter rotating body 12 is a cylindrical member having a refractory 36 formed therein and covered with an iron skin 37, and has a supply port 43 at an upstream end and a discharge port 44 at a downstream end. ing.
A large-diameter sprocket 38 connected to the sprocket 33 by a chain and two annular rails are disposed on the outer peripheral surface of the large-diameter rotating body 12 that coincides with the sprocket 33 provided on the fixed member 13 and the driven rollers 34 and 35. Each member 39 is provided.
The airtight devices 10 and 11 are respectively provided on the upstream end of the large-diameter rotating body 12 and the cylindrical flange portion provided with a gap on the outer periphery in the radial direction of the outer periphery of the downstream end. Cooling air is blown between the cylindrical flange portion and the iron skin 37 to suppress the temperature rise of the seal portion. Hereinafter, the airtight device 10 will be described in detail with reference to FIG.
[0009]
The hermetic device 10 includes an inclined ring member provided with sliding portions 14 and 15 in the shape of a truncated cone through a cylindrical flange portion and mounting flange portions 40 and 41 on the outer periphery on the upstream side of the rotating large-diameter rotating body 12. 16 and 17 are fixedly provided. The sliding portions 14 and 15 of the inclined ring members 16 and 17 are previously surface-treated in pairs, and are arranged in a cross-sectional mountain shape with the respective enlarged diameter portions facing each other.
In addition, the airtight device 10 includes annular seal members 18 and 19 located on the radially outer side of the inclined ring members 16 and 17.
The annular seal members 18 and 19 are members having the same shape in an unloaded state in which an annular rubber plate 25 which is a heat-resistant material and is an example of a plate-like elastic body is covered with an asbestos cloth 26 which is an example of a seal material. It is.
[0010]
The outer end 22 in the radial direction of each of the annular seal members 18, 19 is attached to the annular attachment portion 20 provided on the fixing member 13 by overlapping in the axial direction via an attachment ring member 21 having an L-shaped cross section. It has been. The outer end portions 22 of the annular mounting portion 20, the mounting ring member 21, and the annular seal members 18, 19 are fastened and fixed at predetermined intervals in the circumferential direction by a plurality of bolts 23 and nuts 24, respectively.
The radially inner ends of the annular seal members 18 and 19 are pressed against the sliding portions 14 and 15 of the inclined ring members 16 and 17, respectively. The annular seal member 18 is in contact with the sliding portion 14 whose diameter is expanded on the downstream side of the inclined ring member 16 and bent upstream, and the annular seal member 19 is bent downstream. That is, the annular seal members 18 and 19 press the sliding portions 14 and 15 of the inclined ring members 16 and 17 with a constant pressure by using the restoring force of the annular rubber plate 25 constituting each. This pressing force can be adjusted by the thickness t of the annular rubber plate 25 and the inclination angle θ of the sliding portions 14 and 15 of the inclined ring member 16, and in this embodiment, the thickness t is 3 to 10 mm and the inclination angle. θ is set to 20 to 70 degrees (preferably 45 to 65 degrees).
[0011]
An asbestos yarn 28 that avoids dust is arranged in an annular shape in the gap between the large-diameter rotating body 12 and the fixing member 13 upstream of the airtight device 10 through an annular fixing plate 27. The asbestos yarn 28 also serves as a damper that absorbs sudden fluctuations in the internal pressure of the large-diameter rotating body 12.
As shown in FIG. 2, the airtight device 11 provided in the vicinity of the downstream end of the large-diameter rotating body 12 is oppositely arranged in the same shape and structure as the airtight device 10 provided on the upstream side. Description is omitted.
Next, the state of the airtight devices 10 and 11 during operation of the rotary kiln 29 will be described.
[0012]
When power is transmitted to the large-diameter rotating body 12 through the sprockets 32 and 33 and the large-diameter sprocket 38, the large-diameter rotating body 12 is attached to the outer peripheral surface and supported by the driven rollers 34 and 35. Rotate with. Further, the annular seal members 18 and 19 of the airtight devices 10 and 11 provided on the upstream and downstream ends of the large-diameter rotating body 12 are pressed against the sliding portions 14 and 15 of the inclined ring members 16 and 17, respectively. Rotates while sliding in the applied state.
The outer peripheral surface of the large-diameter rotating body 12 is difficult to form in a perfect circle shape. For this reason, the axis of each annular rail member 39 of the large-diameter rotating body 12 does not match, and rotates with inclination and vibration. The seal position sometimes deviated in the axial direction and the radial direction.
[0013]
For example, when the large-diameter rotating body 12 moves downstream with respect to the fixed member 13, the force with which the annular seal member 18 presses the sliding portion 14 becomes weak, but the annular seal member 19 presses the sliding portion 15. The power to do becomes stronger. In addition, when the large-diameter rotating body 12 moves upstream, the force of the annular seal member 18 is increased and the force of the annular seal member 19 is decreased. In this way, since the seal portion is provided in a double manner and the sliding portions 14 and 15 are arranged to face each other, the pressure in the seal portion is prevented from being lowered due to the movement of the large-diameter rotating body 12 in the axial direction. Therefore, even if the inside of the large-diameter rotating body 12 becomes a high pressure, it is possible to prevent the gas from being ejected from the seal portion to the outside.
Further, since the annular seal members 18 and 19 are sealed by bending the annular rubber plate 25, the annular seal members 18 and 19 are large even when the large-diameter rotating body 12 moves outward or in the radial direction. Sealing can be performed following the movement of the radial rotating body 12, and since the sealing portion is doubled, sealing can be ensured.
[0014]
Next, an airtight device 42 according to a modification will be described with reference to FIG. In addition, since the airtight apparatus 42 only added the greasing piping 45 to the airtight apparatus 10, the same number is attached | subjected to the member same as the airtight apparatus 10, and description is abbreviate | omitted.
Grease supply holes are formed at predetermined intervals in the circumferential direction in the sliding portions 14 and 15 of the inclined ring members 16 and 17. The front part of the greasing pipe 45 is attached to the back side of the sliding parts 14 and 15, respectively, and the base part side of the greasing pipe 45 is connected to a grease supply device or a supply container (not shown). The supply method may be manual or automatic using a compressor.
By comprising in this way, a lubrication agent can be continuously or intermittently supplied to the sliding parts 14 and 15 via the greasing pipe 45. And the frictional resistance at the time of sliding of the sliding parts 14 and 15 and the annular seal members 18 and 19 can be made small, and the lifetime of the annular seal members 18 and 19 can be lengthened.
[0015]
Subsequently, an airtight device 46 for a large-diameter rotating body according to a second embodiment will be described with reference to FIGS. 4 and 5.
The hermetic device 46 is a hermetic device that seals between the large-diameter rotating body 12 driven by a driving source and the fixing member 13 provided with a small gap around the large-diameter rotating body 12. The large-diameter rotating body airtight devices 10 and 11 according to the embodiment are provided at substantially the same position, and can be applied to the rotary kiln 29. Hereinafter, the case where the airtight device 46 is provided on the downstream side of the rotary kiln 29 will be described. In addition, the same number is attached | subjected to the member same as the already demonstrated member, and description is abbreviate | omitted.
The hermetic device 46 includes a sliding ring member 47 that is fixedly disposed on the outer periphery of the large-diameter rotating body 12 via a cylindrical flange portion and includes a sliding portion 53 that has been surface-treated in advance on its peripheral surface. An endless chain member 49 is slidably wound around the outer side of the ring member 47 in the radial direction.
[0016]
The sliding ring member 47 has an outer peripheral surface as a sliding portion 53. The endless chain member 49 includes a plate-shaped link plate 51 on both axial sides (upper and downstream sides) of a large number of rollers 50 provided in the circumferential direction of the sliding ring member 47 and an outer end portion in the axial direction. The link plates 52 each having an L-shaped cross section including attachment members extended on both sides are alternately connected to each other. At a predetermined position in the circumferential direction of the endless chain member 49, for example, tension means such as a coil spring is provided to urge the adjacent roller 50 in the direction of approaching.
The endless chain member 49 is covered with a tire-like rubber ring 54 which is an example of an elastic hollow annular member having an opening in the radial direction from the outside. Both end portions 55 and 56 forming the opening of the tire-like rubber ring 54 are arranged on the roller 50 with a slight gap on the downstream side. When both end portions 55 and 56 are in a free state, they are configured to protrude slightly inward in the radial direction from the inner end (same surface as the sliding portion 53) of the roller 50.
[0017]
The airtight device 46 includes an annular seal member 57 that performs sealing by connecting the fixing member 13 and the endless chain member 49. The two annular seal members 57 are provided with their outer end portions overlapped in the axial direction, and the overlapped outer end portions are attached to the fixing member 13 via the attachment ring member 21 and the annular attachment portion 20. The two annular seal members 57 sandwich the tire-like rubber ring 54 from both sides in the axial direction at the respective inner portions, and each inner end faces the lower side of both end portions 55 and 56 of the tire-like rubber ring 54. The sliding ring member 47 is disposed in sliding contact. Then, the inner portion of each annular seal member 57 is fastened and fixed to the attachment member of the link plate 52 using a bolt 58 and a nut 59 via the tire-like rubber ring 54.
Since the endless chain member 49 is connected to the fixing member 13 via the annular seal member 57 and the like, the endless chain member 49 main body remains in the circumferential direction even when the large-diameter rotating body 12 to which the sliding ring member 47 is fixed rotates. Without moving, the roller 50 only rotates while contacting the sliding ring member 47. The annular seal member 57 is urged radially inward by both end portions 55 and 56 of the tire-like rubber ring 54 having spring properties, and is pressed against the sliding portion 53 of the rotating sliding ring member 47.
[0018]
The inner part of the annular seal member 57 is attached to an endless chain member 49 provided with tension means, and both ends thereof are in contact with the sliding ring member 47, so that the large-diameter rotating body 12 has a radius due to eccentricity or the like. Even if it moves in the direction or axial direction, both ends of the annular seal member 57 can be moved along with the endless chain member 49, and the fluctuation of the pressing force applied to the sliding portion 53 of the sliding ring member 47 can be changed. Can be prevented. Further, since the end portions are provided at two positions on the downstream side of the roller 50, the seal can be formed in a double structure, and the pressure in the large-diameter rotating body 12 is rapidly increased and gas is ejected. This can be prevented.
Also in the present embodiment, it is possible to supply the lubricant to the sliding portion 53 continuously or intermittently via a greasing pipe (not shown).
[0019]
As mentioned above, although embodiment which concerns on this invention has been described, this invention is not limited to the said embodiment, For example, it is also possible to limit the attachment ring member 21 to a metal thing. is there. Since it is made of metal, the strength can be increased and the size of the annular seal member and the tension applied thereto can be reduced to prevent breakage.
Of the members described in the above embodiment, those formed in an annular shape (for example, the annular seal members 18 and 19 and the inclined ring members 16 and 17) can be divided into 2 to 8 and manufactured. is there. By dividing, each member can be manufactured at a low cost and can be easily replaced.
Moreover, although the connection of each member is comprised so that replacement | exchange and a maintenance can be performed easily using a volt | bolt and a nut, it is also possible to utilize other fixing means, such as welding. Moreover, the grease to be used can also be supplied from the annular seal member side.
[0020]
【The invention's effect】
In the airtight device for a large-diameter rotating body according to any one of claims 1 to 3, since it has an annular seal member that overlaps with a pair of sliding portions, the internal gas is externally generated when the seal portion is doubled and positive pressure is applied. Can be prevented from being ejected. In addition, since the sliding part is formed in a cross-sectional mountain shape, the pressing direction by the annular seal member can be distributed on both sides in the axial direction, and the sliding resistance applied to the large-diameter rotating body is made uniform, and the seal during operation Inclination and twisting of the member can be prevented.
In particular, in the airtight device for a large-diameter rotating body according to claim 2, since the annular seal member is configured by covering the plate-like elastic body with a seal material, the flexibility and wear resistance are improved, and the seal portion It is possible to stably apply a constant pressure to the plate, reduce wear due to sliding, and prevent heat from being directly transmitted to the plate-like elastic body, thereby extending the life of the annular seal member.
In the airtight device for the large-diameter rotating body according to the third aspect , since the lubricant is supplied, the sliding resistance can be reduced and the life of the annular seal member can be extended.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an airtight device according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a rotary kiln to which the same hermetic device is applied.
FIG. 3 is a cross-sectional view of an airtight device according to a modification of the airtight device.
FIG. 4 is a cross-sectional view of an airtight device according to a second embodiment of the present invention.
FIG. 5 is a partially enlarged sectional view of the hermetic device.
FIG. 6 is a cross-sectional view of an airtight device according to a conventional example.
[Explanation of symbols]
10, 11: Airtight device, 12: Large-diameter rotating body, 13: Fixed member, 14, 15: Sliding part, 16, 17: Inclined ring member, 18, 19: Annular seal member, 20: Annular mounting part, 21 : Mounting ring member, 22: outer end, 23: bolt, 24: nut, 25: annular rubber plate (plate-like elastic body), 26: asbestos cloth (sealing material), 27: fixing plate, 28: asbestos yarn, 29: rotary kiln, 30: screw feeder, 31: burner, 32, 33: sprocket, 34, 35: driven roller, 36: refractory, 37: iron skin, 38: large-diameter sprocket, 39: annular rail member, 40, 41: mounting flange portion, 42: airtight device, 43: supply port, 44: discharge port, 45: grease supply pipe, 46: airtight device, 47: sliding ring member, 49: endless chain member, 5 : Roller, 51: link plate, 52: link plate (mounting member), 53: sliding portion, 54: tire-like rubber ring (elastic hollow annular member), 55, 56: end, 57: annular seal member, 58 : Bolt, 59: Nut

Claims (3)

An airtight device that seals between a large-diameter rotating body driven by a driving source and a fixing member provided with a small gap around the rotating body,
An inclined ring member provided with a sliding portion that is provided in a cross-sectional mountain shape on the outer periphery of the large-diameter rotating body and is previously surface-treated as a pair;
Located on the outer side in the radial direction of the inclined ring member, the fixed member is provided by being overlapped in the axial direction via the attachment ring member, and the respective inner ends in the radial direction are provided on the sliding portions of the inclined ring member. An airtight device for a large-diameter rotating body having an annular seal member that presses each of the members.   2. The airtight device for a large-diameter rotating body according to claim 1, wherein the annular seal member is configured by covering a plate-like elastic body with a sealing material. The airtight device for a large-diameter rotating body according to any one of claims 1 and 2 , wherein the lubricant is continuously or intermittently supplied to the sliding portion via a greasing pipe. An airtight device for large diameter rotating bodies.

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