CN114183472A - Bearing seal structure of built-in suspension type oil blocking device - Google Patents

Bearing seal structure of built-in suspension type oil blocking device Download PDF

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Publication number
CN114183472A
CN114183472A CN202111517190.0A CN202111517190A CN114183472A CN 114183472 A CN114183472 A CN 114183472A CN 202111517190 A CN202111517190 A CN 202111517190A CN 114183472 A CN114183472 A CN 114183472A
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CN
China
Prior art keywords
oil
riding wheel
bearing
built
splash
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111517190.0A
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Chinese (zh)
Inventor
霍欣
徐大鹏
白城
李�根
崔学文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Acre Coking and Refractory Engineering Consulting Corp MCC
Original Assignee
Acre Coking and Refractory Engineering Consulting Corp MCC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Acre Coking and Refractory Engineering Consulting Corp MCC filed Critical Acre Coking and Refractory Engineering Consulting Corp MCC
Priority to CN202111517190.0A priority Critical patent/CN114183472A/en
Publication of CN114183472A publication Critical patent/CN114183472A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • F16J15/3288Filamentary structures, e.g. brush seals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/44Free-space packings
    • F16J15/447Labyrinth packings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/50Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • F16J15/52Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16NLUBRICATING
    • F16N11/00Arrangements for supplying grease from a stationary reservoir or the equivalent in or on the machine or member to be lubricated; Grease cups
    • F16N11/08Arrangements for supplying grease from a stationary reservoir or the equivalent in or on the machine or member to be lubricated; Grease cups with mechanical drive, other than directly by springs or weights
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/22Rotary drums; Supports therefor
    • F27B7/24Seals between rotary and stationary parts

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Sealing Of Bearings (AREA)

Abstract

The invention relates to a bearing sealing structure of a built-in hanging type oil retaining device, which comprises a supporting roller bearing, a supporting roller shaft, an oil scoop, an oil pan, an oil retainer, a splash-proof membrane, a tension spring, a hanging pin shaft, a positioning pin, an oil brush and a labyrinth sealing ring. The beneficial effects are as follows: the device is provided with the built-in hanging type oil retaining device to form multiple protective barriers inside the bearing, so that the way of leakage of lubricating oil to the outside of the bearing is blocked, the leakage of the lubricating oil is effectively prevented, the leakage problem of the lubricating oil is fundamentally solved, the sealing effect of the bearing is improved, and the device is simple and compact in structure, light in weight and convenient to maintain.

Description

Bearing seal structure of built-in suspension type oil blocking device
Technical Field
The invention relates to the technical field of rotary kiln equipment sealing, in particular to a bearing sealing structure with a built-in hanging type oil blocking device.
Background
At present, the lubrication mode of the riding wheel bearing of the active lime rotary kiln is thin oil lubrication, and a cavity at the lower part of the bearing is filled with lubricating oil. The oil scoop arranged at the end part of the supporting roller shaft continuously scoops lubricating oil into the oil pan positioned at the upper end of the supporting roller shaft, so that the supporting roller shaft is continuously lubricated. The supporting roller is obliquely arranged along with the rotary kiln, so that the supporting roller shaft is also inclined, lubricating oil on the upper surface of the supporting roller shaft can flow from a high end to a low end along the axial direction, and if the opening of the bearing is positioned at the low end, the load of a sealing ring arranged at the opening of the low end bearing is increased due to the gathering of the lubricating oil, and the oil leakage phenomenon is caused. And lubricating oil on the oil pan can splash to four places when flowing to the riding wheel shaft, and the collection of the lubricating oil at the opening of the bearing can be increased, so that oil leakage is caused.
If the barrier is arranged, the oil is directly prevented from flowing and splashing to the outer side of the bearing, the situation can be prevented to a certain extent, and the oil leakage can be reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention solves the technical problem of providing the bearing sealing structure of the built-in hanging type oil blocking device, the built-in hanging type oil blocking device forms multiple protective barriers in the bearing, blocks the way of lubricating oil leaking to the outside of the bearing, effectively prevents the lubricating oil from leaking, fundamentally solves the problem of lubricating oil leakage, improves the sealing effect of the bearing, and has the advantages of simple and compact structure, light weight and convenient maintenance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bearing sealing structure of a built-in hanging type oil retaining device comprises a riding wheel bearing, a riding wheel shaft, an oil scoop, an oil pan, an oil retainer, an anti-splash membrane, a tension spring, a hanging pin shaft, a positioning pin, an oil brush and a labyrinth seal ring, and is characterized in that the oil retainer is fixedly supported by the hanging pin shaft and the positioning pin and is hung on a riding wheel bearing cover above the riding wheel shaft of which the riding wheel shaft extends into the opening end of the riding wheel bearing, the anti-splash membrane is arranged near the opening end of the riding wheel bearing of the oil retainer and is fixedly connected with the opening end of the riding wheel bearing by the tension spring, and the oil brush is embedded at the bottom of the anti-splash membrane and is attached to the surface of the riding wheel shaft to form the built-in hanging type oil retaining device; the oil scoop is fixed at the end part of the riding wheel shaft, and the oil pan is suspended above the riding wheel shaft and is positioned in the turning radius range of the oil scoop; the labyrinth seal ring is arranged in an end cover of the riding wheel bearing.
The oil deflector is a special-shaped structural part with a V-shaped cross section, the upper end surface and the middle lower part of the oil deflector are respectively provided with a transverse rib plate, the transverse rib plate is provided with a through hole, and the lower end surface of the transverse rib plate is provided with a semi-long circular groove hole; the V-shaped tip of the oil deflector is provided with a notch.
The V-shaped tip of the oil stopper faces the interior of the riding wheel bearing along the axis of the riding wheel shaft, and two working V surfaces extending from the middle to two sides divide lubricating oil to two sides.
The two ends of the tensioning spring are fixedly connected with the splash-proof membrane by adopting fixed clamping pieces, and the middle part of the tensioning spring is clamped in a notch at the V-shaped tip of the oil deflector.
The splash-proof membrane is made of PET (polyethylene terephthalate) high-molecular environment-friendly materials, is supported at the far V-shaped tip of the oil deflector through the tensioning spring, is arranged into an arc shape by extending to two V sides of the oil deflector, and is contained in a containing space formed by the V-shaped inclined sides of the oil deflector, so that a certain amount of lubricating oil can be stored, the impact splashing energy of oil can be absorbed, and the kinetic energy of the lubricating oil is reduced.
The oil brush is composed of a plastic framework, an oil-resistant rubber strip and a spring steel sheet, wherein the oil-resistant rubber strip penetrates through a notch formed in the lower end of the plastic framework and is fixed together through the spring steel sheet, and the oil-resistant rubber strip is well attached to the surface of the supporting wheel shaft due to the elasticity of the spring steel sheet.
Compared with the prior art, the invention has the beneficial effects that:
1) the hanging type oil blocking device arranged in the device can not only block lubricating oil from flowing outwards along the supporting wheel shaft, but also block the lubricating oil splashed on the shaft, form multiple protective barriers in the bearing, block the way of lubricating oil from leaking to the outside of the bearing, fundamentally solve the problem of lubricating oil leakage, improve the sealing effect of the bearing and effectively prevent the lubricating oil from leaking;
2) simple structure, compactness, light in weight, easy maintenance.
Drawings
FIG. 1 is a schematic diagram of the structural principle of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is a schematic view of the cross-sectional structure B-B in FIG. 2;
FIG. 4 is a schematic view of the cross-sectional structure C-C of FIG. 2;
FIG. 5 is a partially enlarged view of portion I of FIG. 1;
FIG. 6 is a schematic view of the cross-sectional structure E-E of FIG. 5;
FIG. 7 is a schematic view of the cross-sectional F-F structure of FIG. 5;
FIG. 8 is a schematic front view of the oil deflector of the present invention;
fig. 9 is a schematic plan view of the oil deflector according to the principle of the structure of the present invention.
In the figure: 1-riding wheel bearing 2-riding wheel shaft 3-oil scoop 4-oil pan 5-oil deflector 51-transverse rib plate 52-semi-long circular slotted hole 53-through hole 54-notch 6-splash-proof membrane 7-tension spring 8-hanging pin shaft 9-positioning pin 10-oil brush 101-plastic framework 102-oil-proof rubber strip 103-spring steel sheet 11-labyrinth seal ring
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1-9, the bearing sealing structure of a built-in hanging type oil baffle device according to the present invention comprises a riding wheel bearing 1, a riding wheel shaft 2, an oil scoop 3, an oil pan 4, an oil baffle 5, a splash-proof membrane 6, a tension spring 7, a hanging pin shaft 8, a positioning pin 9, an oil brush 10 and a labyrinth seal ring 11, wherein the oil baffle 5 is fixedly supported by the hanging pin shaft 8 and the positioning pin 9, the riding wheel bearing 1 suspended above the riding wheel shaft 2 extending into an opening end of the riding wheel bearing 1 from the riding wheel shaft 2 is covered, the splash-proof membrane 6 is arranged near the opening end of the riding wheel bearing 1 of the oil baffle 5 and is fixedly connected by the tension spring 7, and the oil brush 10 is embedded at the bottom of the splash-proof membrane 6 and is attached to the surface of the riding wheel shaft 2 to form the built-in hanging type oil baffle device; the oil scoop 3 is fixed at the end part of the riding wheel shaft 2, and the oil pan 4 is suspended above the riding wheel shaft 2 and is positioned in the turning radius range of the oil scoop 3; the labyrinth seal ring 11 is arranged in an end cover of the riding wheel bearing 1.
The oil deflector 5 is a special-shaped structural part with a V-shaped cross section, the upper end surface and the middle lower part of the oil deflector are respectively provided with a transverse rib plate 51, the transverse rib plate is provided with a through hole 53, and the lower end surface is provided with a semi-long circular groove hole 52; the V-shaped tip of the oil deflector 5 is provided with a notch 54; the positioning pin 9 extends into the semi-long circular groove hole 52 and is in threaded connection with the hanging pin shaft 8 from the through hole 53, the oil stopper 5 is suspended on the upper surface of the riding wheel shaft 2 in a floating mode, and micro deflection can be automatically generated along with rotation of the riding wheel shaft 2.
The V-shaped tip of the oil baffle 5 faces the inside of the riding wheel bearing 1 along the axis of the riding wheel shaft 2, and two working V surfaces extending from the middle to two sides divide the lubricating oil to two sides to be used as a first barrier for blocking the lubricating oil.
Two ends of the tensioning spring 7 are fixedly connected with the splash-proof membrane 6 through fixed clamping pieces, the middle part of the tensioning spring 7 is clamped in a notch 54 at the V-shaped tip of the oil stopper 5, and the tensioning spring 7 is used for preventing the splash-proof membrane 6 from being deformed due to impact.
The splash-proof membrane 6 is made of PET high-molecular environment-friendly materials, is supported at the far V-shaped tip of the oil stopper 5 through the tensioning spring 7, is arranged into an arc shape by extending to the two V sides of the oil stopper 5, and is contained in a containing space formed by the V-shaped inclined sides of the oil stopper 5, so that a certain amount of lubricating oil can be stored, the impact splashing energy of the oil can be absorbed, and the kinetic energy of the lubricating oil is reduced. The PET high molecular environment-friendly material is the same as the material of the medical protective mask, so the splash-proof membrane 6 has excellent performances of wear resistance, oil resistance, temperature resistance and the like.
The oil brush 10 is composed of a plastic framework 101, an oil-resistant rubber strip 102 and a spring steel sheet 103, wherein the oil-resistant rubber strip 102 penetrates through a notch formed in the lower end of the plastic framework 101 and is fixed together through the spring steel sheet 103, and the elasticity of the spring steel sheet 103 enables the oil-resistant rubber strip 102 to be well attached to the surface of the supporting roller shaft 2.
When the device works, lubricating oil in the base of the riding wheel bearing 1 is conveyed into an oil pan 4 on the upper surface of the riding wheel shaft 2 through the rotation of an oil scoop 3 arranged at the end part of the riding wheel shaft 2; lubricating oil in the oil pan 4 uniformly flows to the surface of the riding wheel shaft 2 along the axial direction of the riding wheel shaft 2 to realize the lubrication of the riding wheel shaft 2; an oil baffle 5 with a built-in hanging type oil baffle device is vertically suspended on the upper surface of the riding wheel shaft 2 and serves as a first barrier for stopping lubricating oil, the working surface of the oil baffle 5 can stop and divide the lubricating oil, and the lubricating oil is guided to the two sides of the riding wheel shaft 2 and flows into a cavity at the lower part of the riding wheel bearing 1; the splash-proof membrane 6 is supported on the back of the oil stopper 5, and extends to two sides of the axial diameter of the supporting wheel shaft 2 to form a larger space, and another larger barrier is built to block splashed lubricating oil; an oil brush 10 embedded at the bottom of the splash-proof membrane 6 is well attached to the surface of the riding wheel shaft 2, lubricating oil is brushed to the two sides of the riding wheel shaft 2, and a tension spring 7 tensions the splash-proof membrane 6 to prevent the splash-proof membrane from deforming; the labyrinth seal 11 constitutes a final protective barrier to prevent leakage of lubricating oil.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention, the technical solutions and the inventive concepts of the present invention with equivalent or modified alternatives and modifications within the technical scope of the present invention.

Claims (6)

1. A bearing sealing structure of a built-in hanging type oil retaining device comprises a riding wheel bearing, a riding wheel shaft, an oil scoop, an oil pan, an oil retainer, an anti-splash membrane, a tension spring, a hanging pin shaft, a positioning pin, an oil brush and a labyrinth seal ring, and is characterized in that the oil retainer is fixedly supported by the hanging pin shaft and the positioning pin, is hung on a riding wheel bearing cover above the riding wheel shaft extending into the opening end of the riding wheel bearing, the anti-splash membrane is arranged at the opening end of the oil retainer close to the riding wheel bearing and is fixedly connected with the riding wheel bearing by the tension spring, and the oil brush is embedded at the bottom of the anti-splash membrane and is attached to the surface of the riding wheel shaft to form the built-in hanging type oil retaining device; the oil scoop is fixed at the end part of the riding wheel shaft, and the oil pan is suspended above the riding wheel shaft and is positioned in the turning radius range of the oil scoop; the labyrinth seal ring is arranged in an end cover of the riding wheel bearing.
2. The bearing sealing structure of the built-in hanging type oil baffle device according to claim 1, wherein the oil baffle is a special-shaped structural member with a V-shaped cross section, a transverse rib plate is respectively arranged on the upper end surface and the middle lower part of the oil baffle, a through hole is arranged on the transverse rib plate, and a semi-long circular groove hole is formed in the lower end surface of the transverse rib plate; the V-shaped tip of the oil deflector is provided with a notch.
3. The bearing sealing structure of an internally-suspended oil deflector according to claim 1, wherein a V-shaped tip of the oil deflector is disposed toward an inside of the idler bearing along an axis of the idler shaft.
4. The bearing sealing structure of the built-in hanging type oil baffle device as claimed in claim 1, wherein two ends of the tension spring are fixedly connected with the splash-proof diaphragm by using fixed clips, and the middle part of the tension spring is clamped in a notch at the V-shaped tip of the oil baffle device.
5. The bearing sealing structure of the built-in hanging type oil baffle device as claimed in claim 1, wherein the splash-proof membrane is made of PET high molecular environment-friendly material, is supported at the far V-shaped tip of the oil baffle through a tension spring, and is arranged in an arc shape extending outwards from two V-shaped edges of the oil baffle.
6. The bearing sealing structure of a built-in hanging type oil baffle device as claimed in claim 1, wherein the oil brush is composed of a plastic skeleton, an oil-resistant rubber strip and a spring steel sheet, wherein the oil-resistant rubber strip passes through a notch formed at the lower end of the plastic skeleton and is fixed together by the spring steel sheet.
CN202111517190.0A 2021-12-13 2021-12-13 Bearing seal structure of built-in suspension type oil blocking device Pending CN114183472A (en)

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Application Number Priority Date Filing Date Title
CN202111517190.0A CN114183472A (en) 2021-12-13 2021-12-13 Bearing seal structure of built-in suspension type oil blocking device

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Application Number Priority Date Filing Date Title
CN202111517190.0A CN114183472A (en) 2021-12-13 2021-12-13 Bearing seal structure of built-in suspension type oil blocking device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114810830A (en) * 2022-05-06 2022-07-29 宜兴市环宇轴瓦制造有限公司 Ten thousand tons of rotary kilns support bearing assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1397477A (en) * 2001-07-12 2003-02-19 松下电器产业株式会社 Liquid splash preventing mechainsm and parts mounting appts.
JP2004060922A (en) * 2002-07-25 2004-02-26 Ishikawajima Harima Heavy Ind Co Ltd Sealing device for rotary kiln
WO2007101414A1 (en) * 2006-03-08 2007-09-13 Ludwig Dittmann Bearing sleeve system for a two-part steering column
US20100248597A1 (en) * 2009-03-27 2010-09-30 Kentaro Sakata Equipment and method for cleaning polishing cloth
CN112146431A (en) * 2020-10-21 2020-12-29 武钢资源集团有限公司 Large rotary kiln riding wheel sealing device
CN216715009U (en) * 2021-12-13 2022-06-10 中冶焦耐(大连)工程技术有限公司 Bearing seal structure of built-in suspension type oil blocking device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1397477A (en) * 2001-07-12 2003-02-19 松下电器产业株式会社 Liquid splash preventing mechainsm and parts mounting appts.
JP2004060922A (en) * 2002-07-25 2004-02-26 Ishikawajima Harima Heavy Ind Co Ltd Sealing device for rotary kiln
WO2007101414A1 (en) * 2006-03-08 2007-09-13 Ludwig Dittmann Bearing sleeve system for a two-part steering column
US20100248597A1 (en) * 2009-03-27 2010-09-30 Kentaro Sakata Equipment and method for cleaning polishing cloth
CN112146431A (en) * 2020-10-21 2020-12-29 武钢资源集团有限公司 Large rotary kiln riding wheel sealing device
CN216715009U (en) * 2021-12-13 2022-06-10 中冶焦耐(大连)工程技术有限公司 Bearing seal structure of built-in suspension type oil blocking device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114810830A (en) * 2022-05-06 2022-07-29 宜兴市环宇轴瓦制造有限公司 Ten thousand tons of rotary kilns support bearing assembly

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