CN216715008U

CN216715008U - Roller and rolling mill tension measuring system

Info

Publication number: CN216715008U
Application number: CN202122584750.6U
Authority: CN
Inventors: 赵兴; 张小松; 闫林伟; 王御; 李生存; 关军; 张良
Original assignee: Shougang Jingtang United Iron and Steel Co Ltd
Current assignee: Shougang Jingtang United Iron and Steel Co Ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-06-10
Anticipated expiration: 2031-10-26

Abstract

The utility model discloses a roller and a rolling mill tension measuring system, wherein the roller comprises a mandrel, a roller sleeve, a bearing, an auxiliary sealing piece and a sealing end cover; the roller sleeve is sleeved on the bearing and the mandrel and is fixedly connected with the outer ring of the bearing; the sealing end cover is sleeved at the end part of the mandrel and butted with the roller sleeve, and the sealing end cover and the roller sleeve surround a closed lubricating cavity; the bearing and the auxiliary sealing element are respectively sleeved on the mandrel, the bearing and the auxiliary sealing element are both packaged in the lubricating cavity, the auxiliary sealing element is arranged between the bearing and the sealing end cover, the auxiliary sealing element seals a gap between the mandrel and the roller sleeve, the auxiliary sealing element comprises a movable ring and a static ring, the movable ring is connected with the roller sleeve, and the static ring is fixedly sleeved on the mandrel. According to the roller provided by the utility model, double sealing of the end part of the roller is realized through the sealing end cover and the auxiliary sealing piece, so that emulsified oil sludge is prevented from entering the inside of the roller, and the technical problems of serious oil sludge blockage at two ends of the roller and shortened service time are solved.

Description

Roller and rolling mill tension measuring system

Technical Field

The utility model relates to the technical field of tension measurement of rolling mills, in particular to a roller and a tension measurement system of a rolling mill.

Background

The rolling mill tension measuring system comprises a roller, a compression roller, a shaft seat, a pressure head and the like, wherein the roller is arranged on a connecting beam between rolling mill housing windows at the outlet side of a rack and used for measuring the tension of strip steel. The press roller is installed at the inlet side of each roller, maintains the wrap angle of the strip steel to the roller, and can remove the emulsion adhered to the surface of the strip steel.

In the prior art, when a roller in a rolling mill area is in an emulsion oil sludge erosion working condition for a long time in acid rolling production, the technical problems of serious oil sludge blockage at two ends of the roller and shortened service time exist, meanwhile, the lubrication of a bearing is poor due to serious emulsification of lubricating oil, the vibration and tension jumping of a roller body are caused due to increased play, the service life of the bearing is directly influenced, and the thickness measurement of strip steel is also directly influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a roller and a rolling mill tension measuring system, which solve the technical problems of roller body shaking and tension jumping of the roller in the working process, avoid the two ends of the roller from being blocked by oil sludge, and effectively prolong the service life of a bearing and the replacement period of the roller.

The technical scheme adopted for realizing the aim of the utility model is that the roller comprises a mandrel, a roller sleeve, a bearing, an auxiliary sealing element and a sealing end cover; the roller sleeve is sleeved on the bearing and the mandrel and is fixedly connected with the outer ring of the bearing; the sealing end cover is sleeved at the end part of the mandrel and is butted with the roller sleeve, and the sealing end cover and the roller sleeve surround to form a closed lubricating cavity; the bearing with supplementary sealing member overlaps respectively and establishes in the dabber, just the bearing with supplementary sealing member all encapsulates in the lubrication cavity, supplementary sealing member sets up the bearing with between the end cover, supplementary sealing member seals the dabber with the clearance of roller shell, supplementary sealing member includes rotating ring and quiet ring, the rotating ring with the roller shell is connected, the fixed cover of quiet ring is established the dabber.

Further, the rotating ring with quiet ring axial butt joint, the butt joint terminal surface of rotating ring with be provided with assorted embedding boss and annular on the butt joint terminal surface of quiet ring respectively, the rotating ring passes through the embedding boss with the annular with quiet ring is connected.

Furthermore, the movable ring is provided with a protruding part, the protruding part protrudes out of the roller sleeve, and the protruding part is clamped between the sealing end cover and the roller sleeve, so that the movable ring is axially limited through the protruding part.

Further, supplementary sealing member still includes the retaining member, the retaining member cover is established on the dabber, the retaining member sets up quiet ring with between the end cover, quiet ring passes through the rotating ring with the retaining member axial is spacing.

Furthermore, the sealing end cover is provided with a butt-joint flange, the sealing end cover is in butt joint with the roller sleeve through the butt-joint flange, and corresponding connecting holes are formed in the end face of the roller sleeve, the protruding portion and the butt-joint flange.

Further, the sealing end cap is in interference fit with the mandrel.

Further, an oil delivery channel is arranged in the mandrel, an inlet of the oil delivery channel is located on the surface of the end portion of the mandrel, and an outlet of the oil delivery channel is located in the lubricating cavity and close to the inner ring of the bearing.

Furthermore, the end part of the mandrel is also provided with a mounting hole communicated with the oil transportation channel, and the roller further comprises an oil injection nozzle which is arranged on the mandrel through the mounting hole.

Further, the mounting hole is formed between the inlet and the outlet of the oil conveying channel, and a plug is arranged at the inlet of the oil conveying channel.

Based on the same inventive concept, the utility model also provides a rolling mill tension measuring system which comprises a roller and a compression roller, wherein the roller and/or the compression roller adopt the structure of any one of the rollers.

According to the technical scheme, the roller comprises a mandrel, a roller sleeve, a bearing, an auxiliary sealing piece and a sealing end cover; the roller sleeve is sleeved on the bearing and the mandrel and fixedly connected with the outer ring of the bearing, and the bearing and the roller sleeve rotate coaxially. The end part of the mandrel is sleeved with the sealing end cover, the sealing end cover is in butt joint with the roller sleeve, the sealing end cover and the roller sleeve surround to form a closed lubricating cavity, the sealing end cover and the roller sleeve rotate coaxially, and meanwhile, external media are prevented from entering the roller sleeve, so that the primary sealing of the end part of the roller is realized. The bearing and the auxiliary sealing element are respectively sleeved on the mandrel, the bearing and the auxiliary sealing element are both packaged in the lubricating cavity, the auxiliary sealing element is arranged between the bearing and the sealing end cover, the auxiliary sealing element seals the gap between the mandrel and the roller sleeve, and the lubricating cavity is secondarily sealed. The auxiliary sealing element comprises a movable ring and a static ring, the movable ring is connected with the roller sleeve, the static ring is fixedly sleeved on the mandrel, the auxiliary sealing element is fixed inside the roller, meanwhile, a medium is further prevented from entering a bearing part, the bearing is also axially limited through the auxiliary sealing element connected with the roller sleeve, the whole assembly is realized, the stability of the bearing operation is ensured, and the bearing jump is avoided.

Compared with the prior art, the roller provided by the utility model realizes double sealing of the end part of the roller through the sealing end cover and the auxiliary sealing element, ensures that an external medium, particularly emulsion oil sludge, cannot enter the roller, solves the technical problems of poor lubrication of a bearing and vibration and tension jumping of a roller body due to the increase of clearance caused by poor lubrication and serious emulsification of lubricating oil when the roller in a rolling mill area is in an emulsion oil sludge erosion state for a long time in the acid rolling production, avoids the blockage of the two ends of the roller by oil sludge, and effectively prolongs the service life of the bearing and the replacement period of the roller.

According to the rolling mill tension measuring system provided by the utility model, the roller and/or the compression roller adopt the structure of the roller, so that the rolling mill tension measuring system naturally has the beneficial effects brought by the roller, the roller and the compression roller can prevent a medium from entering a lubricating cavity under the working condition environment of emulsion oil sludge erosion, the technical problems of poor bearing lubrication and roller body shaking and tension jumping caused by increased play due to serious emulsification of lubricating oil are avoided, the service life of a bearing is prolonged, and the thickness measurement and the tension measurement stability of strip steel are ensured.

Drawings

FIG. 1 is a schematic view of the overall structure of a roller according to an embodiment of the present invention;

FIG. 2 is a schematic view of the end of the middle roller of FIG. 1;

FIG. 3 is a schematic view of the end closure of the roll of FIG. 1.

Description of the drawings: 1-mandrel, 11-oil transportation channel, 111-axial channel, and 112-radial channel; 2-roller sleeve; 3-bearing, 31-bearing housing; 4-auxiliary sealing element, 41-movable ring, 411-projection, 42-stationary ring, 43-locking element; 5-sealing end cover, 51-taper hole, 52-connecting hole; 6-oil injection nozzle; 7-plug.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

In the acid rolling production, because the roller in the rolling mill area is in an emulsion oil sludge erosion state for a long time and the sealing effect of the end part of the roller is poor, the oil sludge at the two ends of the roller is seriously blocked and the service time is shortened. In order to solve the technical problems, the utility model provides a roller and a rolling mill tension measuring system, which solve the technical problem of poor sealing effect of the end part of the roller, and prolong the service life of a bearing and the replacement period of the roller. The contents of the present invention are described in detail below by way of examples:

example 1

The roller provided by the embodiment comprises a mandrel 1, a roller sleeve 2, a bearing 3, an auxiliary sealing element 4 and a sealing end cover 5; the roller shell 2 is sleeved on the bearing 3 and the mandrel 1, the roller shell 2 is fixedly connected with the outer ring of the bearing 3, and the bearing 3 and the roller shell 2 rotate coaxially. The end part of the mandrel 1 is sleeved with the sealing end cover 5, the sealing end cover 5 is in butt joint with the roller sleeve 2, the sealing end cover 5 and the roller sleeve 2 surround to form a closed lubricating cavity, the sealing end cover 5 and the roller sleeve 2 rotate coaxially, meanwhile, external media are prevented from entering, and preliminary sealing of the end part of the roller is achieved. Bearing 3 and auxiliary seal 4 overlap respectively and establish at dabber 1, and bearing 3 and auxiliary seal 4 all encapsulate in lubricated chamber, and auxiliary seal 4 sets up between bearing 3 and end cover 5, and auxiliary seal 4 seals the clearance of dabber 1 and roller shell 2, carries out secondary seal to lubricated chamber, further separation medium entering bearing 3 position. The auxiliary sealing element 4 comprises a movable ring 41 and a static ring 42, the movable ring 41 is connected with the roller sleeve 2, the static ring 42 is fixedly sleeved on the mandrel 1, the auxiliary sealing element 4 is fixed inside the roller, the bearing 3 is axially limited through the auxiliary sealing element 4 connected with the roller sleeve 2, the whole assembly is realized, the stability of the operation of the bearing 3 is ensured, and the jumping of the bearing 3 is avoided.

Among the prior art, the roller works for a long time in relatively poor operating mode environment, or is corroded by emulsion oil mud for a long time, the problem of roll body shake probably appears, through research discovery, the reason that its produced is that a large amount of emulsion sprays on the roller in the production, and roller end is sealed not enough, cause the clearance in partial liquid roller shell 2 and the dabber 1 to enter into inside the roll body, cause lubricating oil serious emulsification, lubrication badly, the play increases, cause the roller operation to be obstructed, the roll body shake, tension is beated, direct influence bearing 3's life and thickness measurement.

Compared with the prior art, the roller provided by the utility model realizes double sealing of the end part of the roller through the sealing end cover 5 and the auxiliary sealing element 4, ensures that an external medium, especially emulsified oil sludge, cannot enter the roller, solves the technical problems of poor lubrication of the bearing 3 and shaking and tension jumping caused by increased play due to poor lubrication of the bearing 3 and serious emulsification of lubricating oil caused by long-term emulsion oil sludge erosion of the roller in a rolling mill area in the acid rolling production, avoids the two ends of the roller from being blocked by oil sludge, and effectively prolongs the service life of the bearing 3 and the replacement period of the roller.

In order to ensure the stable fit of the bearing 3 and the roll shell 2 and to make the bearing 3 work stably, in the embodiment, the bearing 3 further comprises a bearing sleeve 3, and the bearing sleeve 3 is arranged between the bearing 3 and the roll shell 2 and abuts against the bearing 3 and the roll shell 2 along the radial direction of the roll.

In order to reserve the deformation amount and ensure that the sealing end cover 5 can still be stably sealed under the condition of large temperature change, in the embodiment, according to the actual shape space size of the roller and the shaft, the sealing end cover 5 is provided with an inner cavity and a butt joint flanging, the inner cavity is a taper hole 51, the sealing effect of the device is prevented from being influenced by the deformation caused by thermal barrier contraction of the roller body, and the sealing end cover 5 is in butt joint with the roller sleeve 2 through the butt joint flanging.

In order to ensure the blocking effect on external media, the sealing end cover 5 of the roller provided by the utility model is in interference fit with the shaft section of the mandrel 1, so that the shaft is held tightly, and the media are prevented from entering. For the convenience of installation, the aperture of the central hole is 0.20mm smaller than the axial diameter of the shaft section.

According to the environment and working condition of the using part and the chemical characteristics that the temperature of an emulsion medium is about 50 degrees and is alkalescent, the requirements of sealing property, oil resistance, corrosion resistance, high temperature resistance, good elasticity and the like of the sealing end cover 5 are considered, so that the sealing end cover 5 has strong supporting performance and high temperature resistance deformation performance of 70 degrees.

In order to ensure the sealing effect of the auxiliary sealing element 4, in this embodiment, the auxiliary sealing element 4 includes a moving ring 41 and a stationary ring 42 which are axially butted, a butt end face of the moving ring 41 and a butt end face of the stationary ring 42 are respectively provided with a matching embedding boss and a matching ring groove, and the moving ring 41 is connected with the stationary ring 42 through the embedding boss and the matching ring groove, so as to form a labyrinth seal between the moving ring 41 and the stationary ring 42. The rotating ring 41 is connected with the roller sleeve 2, so that the rotating ring 41 and the roller sleeve 2 rotate coaxially, the outer ring of the rotating ring 41 is abutted against the roller sleeve 2, effective double-seal protection is realized through the labyrinth seal structure of the seal end cover 5 and the auxiliary seal 4, the quality of lubricating oil in a lubricating cavity is ensured, and the stable operation of the roller is further ensured.

The connection mode of the movable ring 41 and the roller sleeve 2 is not particularly limited, and holes can be radially formed in the roller sleeve 2 and connected through threaded pieces. In order to simplify the structure, the end cover 5 and the connecting hole 52 of the roll shell 2 are directly utilized, in the embodiment, the movable ring 41 is provided with a protruding part 411, the protruding part 411 protrudes out of the roll shell 2, the protruding part 411 is clamped between the end cover 5 and the roll shell 2, so that the movable ring 41 is axially limited by the protruding part 411, and the end surface of the roll shell 2, the protruding part 411 and the butt flange of the end cover 5 are provided with corresponding connecting holes 52.

Because in the course of the work, can let in lubricating medium to bearing 3 position, quiet ring 42 sets up between bearing 3 and rotating ring 41 with above-mentioned installation, rotating ring 41 is difficult for contact lubricating medium, and quiet ring 42 loses efficacy easily under the condition that lubricating medium corrodes, in this embodiment, set up rotating ring 41 in the one side that is close to bearing 3, supplementary sealing member 4 still includes retaining member 43, retaining member 43 cover is established on dabber 1, retaining member 43 sets up between quiet ring 42 and end cover 5, quiet ring 42 is spacing through rotating ring 41 and retaining member 43 axial, bearing 3 is spacing through rotating ring 41 axial. Namely, the mandrel 1 is sleeved with a bearing 3, a movable ring 41, a static ring 42, a locking member 43 and a sealing end cover 5 in sequence from inside to outside along the axial direction.

In order to ensure the sealing at the connecting gap, in the embodiment, sealing rings are further arranged at the radial gap between the movable ring 41 and the stationary ring 42 and between the movable ring 41 and the roller shell 2.

In order to supply lubricating oil to the bearing 3 and the movable ring 41, the roller is provided with an oil conveying channel 11 in the mandrel 1, wherein the inlet of the oil conveying channel 11 is positioned on the surface of the end part of the mandrel 1, and the outlet of the oil conveying channel 11 is positioned in the lubricating cavity and close to the inner ring of the bearing 3 so as to supply the lubricating oil to the outer surface of the shaft section where the bearing 3 is positioned. The structure and shape of the oil delivery passage 11 are not limited in the present invention, and in this embodiment, in order to facilitate the machining of the oil delivery passage 11, the oil delivery passage 11 includes an axial passage 111 and a radial passage 112.

In order to facilitate the control of the oil delivery state, the end part of the mandrel 1 of the roller provided by the utility model is also provided with a mounting hole communicated with the oil delivery channel 11, the roller further comprises an oil injection nozzle 6, and the oil injection nozzle 6 is arranged on the mandrel 1 through the mounting hole. The present invention is not particularly limited in the arrangement positions of the mounting hole and the oil nipple 6, and the mounting hole may be butted against the inlet of the oil delivery passage 11 with the oil nipple 6 arranged at the end of the oil delivery passage 11. In order to make the oil filling and transportation simpler, in the embodiment, the mounting hole is arranged between the inlet and the outlet of the oil transportation channel 11, the mounting hole is arranged along the radial direction of the mandrel 1, and the inlet of the oil transportation channel 11 is provided with the plug 7 to plug the oil transportation channel 11, at this time, as the end part of the oil transportation channel 11 is plugged by the plug 7, the lubricating oil is introduced into the oil transportation channel 11 through the oil filling nozzle 6, and only the oil can be discharged towards the oil transportation channel 11.

The utility model provides a roller, which effectively avoids the serious emulsification of lubricating oil caused by the injection of emulsion into a roller bearing 3 part, and in view of the roller design structure, the way and the condition of avoiding the emulsion from entering a roller body are researched by combining the working conditions of the using part, the normal operation of the roller is not influenced, and a labyrinth sealing element and a sealing end cover 5 are added at the end part of the roller, so that the emulsion is prevented from entering the emulsified lubricating oil of the roller body to cause lubrication failure, the normal operation of a rolling mill is ensured, the service lives of the roller and a compression roller bearing 3 and the replacement period of the roller are prolonged, the equipment precision requirement of the rolling mill is met, and the production cost is reduced.

Example 2

The utility model also provides a rolling mill tension measuring system which comprises a roller and a compression roller, wherein the roller and/or the compression roller adopt the structure of the roller. The tension measuring system of the rolling mill is not particularly limited, and can be any structure and composition in the prior art. In the prior art, a rolling mill tension measuring system comprises a roller, a compression roller, a shaft seat and a pressure head, wherein the roller is arranged on a connecting beam between rolling mill housing windows at the outlet side of a rack and used for measuring the tension of strip steel. The press roll is installed at the inlet side of each roll, maintains the wrap angle of the strip steel to the roll, and can remove emulsion adhered to the surface of the strip steel. When tension measurement is carried out on the surface of the strip steel, obvious tension deviation occasionally occurs, and researches show that the obvious tension deviation is generated because a large amount of emulsion is sprayed onto a roller in production, the end part of the roller is not sealed enough, so that a gap between a part of liquid roller sleeve 2 and a mandrel 1 enters the inside of a roller body, lubricating oil is seriously emulsified, lubrication is poor, a clearance is increased, the operation of the roller is blocked, the roller body shakes, tension bounce is caused, and the service life and the thickness measurement of a bearing 3 are directly influenced.

Through the roller structure with tension roller and/or compression roller design for embodiment 1 provides, this rolling mill tension measurement system possesses the beneficial effect that above-mentioned roller brought naturally for roller and compression roller are under the operating mode environment of emulsion oil mud erosion, the separation medium gets into lubricated chamber, it is lubricated badly to have avoided the bearing 3 that lubricating oil seriously emulsifies and leads to, the play increase leads to the roll body shake, the technical problem that tension is beated, the life of bearing 3 has been prolonged, guarantee the thickness measurement of belted steel, tension measurement's stability.

Examples of the applications

In a certain strip steel production workshop, when the rolling mill rolls normally until the distance from the hot rolling to the strip head is 25 meters, the strip breakage occurs at the outlet of the No. 1 rack, and the rolling speed before the strip breakage is 370 mpm. According to trace curve analysis, when the strip steel runs at 540mpm speed, a 1# frame tension deviation alarm triggers an automatic stop signal, meanwhile, an operator also beats down to stop quickly, in the process that the speed of a rolling mill is reduced to 370mpm, the 1# frame tension deviation continuously increases until the maximum value of the 1# frame tension deviation before strip breakage is-8.12 tons, and the accident analysis reason is that a tension roller is in an emulsion injection environment for a long time, emulsion oil sludge enters the tension roller, so that the roller operation is blocked, and tension deviation occurs.

When strip steel with the specification of 3.0/0.57 x 1347mm is rolled, 4-5 stand tension loss, 5 stand outlet tension loss and 3-4 stand tension loss are alarmed suddenly. The strip breakage occurs at the outlet of the No. 4 stand, the distance between the strip breakage position and the head of the acid rolling raw material strip is about 432 meters, and the speed of the No. 5 stand before the strip breakage is 1202 mpm. To eliminate the fault, the vehicle was stopped for 8 hours and 38 minutes. The accident analysis shows that the tension between the racks is abnormally increased by 3-4 and 4-5, the tension deviation is more than 2 tons, the forward slip of each rack is a positive value, and the phenomenon of slip is avoided. The reason for the deviation of the tension is that oil sludge at the side end of the tension roller enters the roller body, so that the tension measurement is inaccurate.

In order to solve the technical problem, the roller structure of the embodiment 1 is adopted, and the end part of the tension roller is additionally provided with the auxiliary sealing element and the sealing end cover, so that the emulsification phenomenon of lubricating oil is avoided, the phenomenon of short service life of the bearing caused by severe environment is avoided, and the cost and consumption of spare parts can be reduced. The circular runout caused by poor lubrication and increased play of the roller bearing is reduced and prevented, and the product quality defect and the malignant accident of the rolling mill are caused. After 9 sets of tension rollers and compression rollers of the rolling mill are installed and used, the service life of the rolling mill is prolonged to 6 months from the original service life of 3 months. The annual consumption of the bearing is reduced to 5.76 ten thousand yuan from the original 11.52 ten thousand yuan.

Through the embodiment, the utility model has the following beneficial effects or advantages:

1) according to the roller provided by the utility model, the auxiliary sealing element and the sealing end cover are additionally arranged at the end part of the roller, so that the emulsification phenomenon of lubricating oil is avoided, the phenomenon of short service life of a bearing caused by a severe environment is avoided, and the cost and consumption of spare parts can be reduced. The circular runout caused by poor lubrication and increased play of the roller bearing is reduced and prevented, and the quality defects of products and the occurrence of malignant accidents of the rolling mill are reduced.

2) According to the environment and working condition of the using part and the chemical characteristics that the temperature of an emulsion medium is about 50 degrees and is alkalescent, the sealing end cover has strong supporting performance and high-temperature deformation resistance up to 70 degrees at the moment in consideration of the requirements of sealing performance, oil resistance, corrosion resistance, high temperature resistance, good elasticity and the like of the roller.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the present application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A roller is characterized by comprising a mandrel, a roller sleeve, a bearing, an auxiliary sealing element and a sealing end cover; the roller sleeve is sleeved on the bearing and the mandrel and is fixedly connected with the outer ring of the bearing; the sealing end cover is sleeved at the end part of the mandrel and is butted with the roller sleeve, and the sealing end cover and the roller sleeve surround to form a closed lubricating cavity; the bearing with auxiliary seal spare is established respectively the cover the spindle, just the bearing with auxiliary seal spare all encapsulate in the lubrication cavity, auxiliary seal spare sets up the bearing with between the end cover, auxiliary seal spare is sealed the dabber with the clearance of roller shell, auxiliary seal spare includes rotating ring and quiet ring, the rotating ring with the roller shell is connected, the fixed cover of quiet ring is established the spindle.

2. The roller according to claim 1, characterized in that said rotating ring and said stationary ring are axially butted, and a butt end face of said rotating ring and a butt end face of said stationary ring are respectively provided with a matching embedding boss and a matching annular groove, and said rotating ring is connected with said stationary ring through said embedding boss and said annular groove.

3. The roller according to claim 2 wherein said rotating ring is provided with a projection projecting from said sleeve, said projection being interposed between said end cover and said sleeve so that said rotating ring is axially retained by said projection.

4. The roller according to claim 3 wherein said secondary seal further comprises a retaining member, said retaining member fitting over said mandrel, said retaining member being disposed between said stationary ring and said end cap, said stationary ring being axially retained by said movable ring and said retaining member.

5. The roller according to claim 3 wherein said end cover has a butt flange and said end cover is butt-joined to said sleeve by said butt flange, and corresponding attachment holes are provided in said end surface of said sleeve, said nose and said butt flange.

6. The roller according to any one of claims 1 to 5 wherein said end seal covers have an interference fit with said mandrel.

7. The roller according to claim 6 wherein an oil delivery channel is provided in said mandrel, an inlet of said oil delivery channel being located on a surface of an end of said mandrel, and an outlet of said oil delivery channel being located in said lubrication cavity and adjacent to an inner ring of said bearing.

8. The roller according to claim 7 wherein said end of said mandrel is further provided with a mounting hole communicating with said oil delivery passage, said roller further comprising an oil nipple, said oil nipple being disposed on said mandrel through said mounting hole.

9. The roller according to claim 8 wherein said mounting hole is provided between an inlet and an outlet of said oil transfer channel and said inlet of said oil transfer channel is provided with a plug.

10. A rolling mill tension measuring system comprising a roll and a pinch roll, the roll and/or the pinch roll being constructed as claimed in any one of claims 1 to 9.