CN113337703B

CN113337703B - Carbon sleeve roller

Info

Publication number: CN113337703B
Application number: CN202110589633.0A
Authority: CN
Inventors: 孙云飞; 刘胜; 徐传伟
Original assignee: Wuhan Iron and Steel Co Ltd
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-09-23
Anticipated expiration: 2041-05-28
Also published as: CN113337703A

Abstract

The invention provides a carbon sleeve roller, which comprises a roller core and a carbon sleeve, wherein one end of the roller core is provided with a carbon sleeve fixing shaft neck, the other end of the roller core is provided with a fixing wing, the diameter of the carbon sleeve fixing shaft neck is smaller than that of the roller core, the inner wall of one end of the carbon sleeve is provided with a step part, the step part is matched with the carbon sleeve fixing shaft neck, the other end of the carbon sleeve is provided with a notch which is matched with the fixing wing, the outer side end of the carbon sleeve fixing shaft neck is provided with an external thread which is in threaded connection with a round nut, and the round nut is abutted against the carbon sleeve.

Description

Carbon sleeve roller

Technical Field

The invention belongs to the technical field of hearth rolls of cold rolling and silicon steel continuous annealing line units, and particularly relates to a carbon sleeve roll.

Background

The graphite carbon sleeve is the best furnace bottom roller for supporting and conveying the steel strip in the silicon steel continuous annealing furnace, and the carbon sleeve has relatively low hardness and strength, so that the graphite carbon sleeve and the heat-resistant metal roller core are required to be assembled together in the continuous annealing furnace for the steel strip, and the graphite carbon sleeve is called a carbon sleeve roller. The running condition of the carbon sleeve roller is directly related to the product quality, so that the carbon sleeve and the roller core are ensured to be stably matched firstly. The roller core is made of stainless steel, and the difference between the coefficient of expansion with heat and the coefficient of contraction with cold of the carbon sleeve is more than 6 times. The temperature of each part of the continuous annealing furnace is different, so the carbon sleeve roller is kept to be stably matched with the roller core under the condition that the relative temperature difference reaches more than 1000 ℃.

At present, the furnace bottom roller of the silicon steel and cold rolling continuous annealing line unit mainly adopts the original Japanese snap ring fixing technology, and the snap ring and the fixed wing fix the carbon sleeve on two sides of the carbon sleeve and simultaneously transmit torque. Because the coefficients of expansion with heat and contraction with cold of the carbon sleeve and the stainless steel material are different, a gap of more than 1.8mm is ensured between the carbon sleeve and the roller core when the roller is installed at normal temperature, and the roller core is prevented from expanding and breaking the carbon sleeve after being heated. However, the carbon sleeve and the roller core are loosely matched, axial movement and roller breakage of the carbon sleeve caused by breakage of the snap ring fixing pins often occur, the stability of the carbon sleeve roller in the furnace is poor, the product quality is affected, and the carbon sleeve and the roller core are easy to damage.

Disclosure of Invention

The invention aims to solve the technical problems, provides the carbon sleeve roller, prolongs the service life of the carbon sleeve roller, is beneficial to stable operation of a continuous annealing furnace, reduces the fault rate of a unit, improves the production efficiency of the unit, and plays an important role in the quality of products such as strip steel and the like.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a carbon cover roller, includes roller core and carbon cover, its characterized in that, roller core one end is equipped with carbon cover fixed journal, and the other end is equipped with the stationary vane, the diameter of carbon cover fixed journal is less than the roller core diameter, be equipped with step portion on the inner wall of the one end of carbon cover, step portion and carbon cover fixed journal phase-match, the other end of carbon cover is equipped with the notch, with the stationary vane phase-match, the carbon cover fixed journal outside end is equipped with the external screw thread, with round nut looks spiro union, round nut and carbon cover looks butt.

According to the scheme, the spline is arranged in the region, sleeved with the carbon sleeve, of the shaft neck, and the spline groove is formed in the position, corresponding to the inner wall of the carbon sleeve, of the inner wall of the carbon sleeve.

According to the scheme, the threads of the round nut and the carbon sleeve fixed shaft neck adopt coarse threads, and the axial clearance of the thread pitch and the thread matching is twice of that of the corresponding metric threads.

According to the scheme, the end face of the round nut, which is abutted to the carbon sleeve, is a conical surface.

According to the scheme, the areas of the carbon sleeve fixing shaft neck and the carbon sleeve which are mutually sleeved are all conical surfaces.

According to the scheme, the round nut is provided with the jacking screw.

According to the scheme, the fixed wing is a pin shaft, the pin shaft penetrates through a pin hole in the other end of the roller core and is connected with the pin hole in a welded mode, and two ends of the pin shaft are clamped with the notch in the carbon sleeve.

The invention has the beneficial effects that: the carbon sleeve roller is more stable in fixation, the matching difficulty of carbon and stainless steel under different temperature differences is effectively solved, and errors generated by axial and radial clearances can be eliminated by the pre-tightening round nut at normal temperature; at high temperature, even if the carbon sleeve fixed journal is slightly extended, the carbon sleeve fixed journal can be offset by the taper design of the end part of the journal or the round nut, so that the carbon sleeve roller can keep better stability at different temperatures, and the product quality can be greatly improved; meanwhile, the structure is more reasonable, so that the roll shifting of the carbon sleeve roll can not happen except for normal carbon sleeve abrasion, and the phenomena of carbon sleeve breakage and roll breakage can be basically eliminated; the axial clearance of the thread is enlarged, and the thread is not easy to sinter at high temperature, so that the roll core and the round nut can be put into use again after being slightly cleaned after the roll is changed, and the thread is not required to be cut and repaired by a machine tool. Not only saves the repair cost, but also prolongs the service life of the roller core.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a view taken along direction a of fig. 1.

Fig. 3 is a schematic view of the structure of the carbon sleeve on the side of the fixed journal according to one embodiment of the present invention.

Detailed Description

For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.

As shown in fig. 1-2, a carbon sleeve roller comprises a roller core 1 and a carbon sleeve 2, wherein one end of the roller core is provided with a carbon sleeve fixing shaft neck 3, the other end of the roller core is provided with a fixing wing 4, the diameter of the carbon sleeve fixing shaft neck is smaller than that of the roller core, the inner wall of one end of the carbon sleeve is provided with a step part 5, the step part is matched with the carbon sleeve fixing shaft neck, the other end of the carbon sleeve is provided with a notch 6 which is matched with the fixing wing, the outer side end of the carbon sleeve fixing shaft neck is provided with an external thread which is in threaded connection with a round nut 7, and the round nut is abutted against the carbon sleeve.

The area of the carbon sleeve fixed shaft neck sleeved with the carbon sleeve is provided with a spline 8, and the inner wall of the carbon sleeve is provided with a spline groove at the corresponding position. The spline is used for transmitting torque, and various forms can be designed according to requirements. The spline design makes the torque transmission more even than the snap ring before, avoids the carbon cover to receive the damage in the torque transmission more easily. For preventing that carbon sleeve atress is more even, adopt circular structure in this application, prevent that stress concentration from causing the damage to carbon sleeve.

The threads of the round nut and the carbon sleeve fixed shaft neck adopt coarse threads, and the axial clearance of the thread pitch and the thread matching is twice of that of the corresponding metric threads. A metric coarse thread refers to the coarsest thread in the combination of nominal diameter and pitch of the metric thread. Enough clearance is reserved inside the internal and external thread connection, so that the thread connection is not sintered together at high temperature, and axial locking force can be sufficiently provided.

The end face of the round nut, which is abutted against the carbon sleeve, is a conical surface or the area where the carbon sleeve fixing shaft neck is sleeved with the carbon sleeve is a conical surface, and the non-concentricity generated by the gap between the roller core and the carbon sleeve can be eliminated after the round nut is fully pre-tightened. Because the coefficient of thermal expansion of the roller core is larger than that of the carbon sleeve, the round nut can be completely pre-tightened when being installed at normal temperature.

As shown in FIG. 3, a tightening screw 9 is provided on the round nut, and the end of the tightening screw abuts against the journal to prevent loosening.

The diameter of the neck of the roller core shaft is smaller, and the carbon sleeve roller penetrates from the side of the carbon sleeve fixing shaft neck. And after the roller core completely enters the roller core, a round nut is arranged on the shaft neck of the roller core to fix the carbon sleeve. Because the short carbon sleeve is adopted to fix the shaft neck for fixation, even if the shaft neck is heated, the axial matching allowance caused by the expansion coefficient of the shaft neck part of the roller core is extremely limited, and the measurement is less than 5 mm. And the carbon sleeve roller with two axially fixed ends is adopted before, and the axial allowance reaches more than 30mm after being heated. Because the carbon sleeve is fixed by the shaft neck and the round nut, the reliability is greatly improved. Unless the whole carbon sleeve at the position of the fixed shaft neck is crushed, the axial fixing effect of the carbon sleeve is hardly influenced.

The fixed wing is a pin shaft, penetrates through a pin hole in the other end of the roller core and is connected with the pin hole in a welding mode, and two end heads of the pin shaft are clamped with a notch in the carbon sleeve. The fixed wing only transmits torque and does not bear the axial fixing function any more, so that the carbon sleeve at the position can hardly be damaged.

The silicon steel heat treatment unit can eliminate roller shifting and roller breaking faults completely by adopting the method and the device because about 2% of defective products or waste products generated by the position shifting or roller breaking of the furnace roller are generated. Because the product quality is improved, according to conservative estimation, each unit can generate millions of yuan more each year.

Because the structure is more stable, the service life of the carbon sleeve roller is at least prolonged by 20 percent compared with the prior service life, and the cost of each unit can be saved by more than 40 ten thousand yuan per year according to the consumption of 200 ten thousand yuan of the carbon sleeve roller spare parts per year of each unit.

The present invention is illustrated by the above examples, and is not limited to the embodiments of the present invention, and the structure, the position arrangement and the connection of the components may be changed. On the basis of the present invention, any changes or equivalent changes of the individual components according to the principle of the present invention should not be excluded from the scope of the present invention.

Claims

1. The utility model provides a carbon cover roller, includes roller core and carbon cover, its characterized in that, roller core one end is equipped with the fixed journal of carbon cover, and the other end is equipped with the stationary vane, the diameter of the fixed journal of carbon cover is less than the roller core diameter, be equipped with step portion on the inner wall of the one end of carbon cover, step portion and the fixed journal phase-match of carbon cover, the other end of carbon cover are equipped with the notch, with the stationary vane phase-match, the fixed journal outside end of carbon cover is equipped with the external screw thread, with round nut looks spiro union, round nut and carbon cover looks butt, and the terminal surface of round nut and carbon cover looks butt is the circular conical surface for the area that circular conical surface or carbon cover fixed journal and carbon cover cup jointed each other.

2. The carbon sleeve roller as recited in claim 1, wherein the journal has splines formed on a region thereof that is engaged with the carbon sleeve, and spline grooves formed in a corresponding position on an inner wall of the carbon sleeve.

3. The carbon sleeve roller as claimed in claim 1 or 2, wherein the round nut and the carbon sleeve fixed journal thread are coarse threads, and the thread pitch and the axial clearance of the thread fit are twice as large as those of the corresponding metric thread.

4. The carbon shell roller as in claim 3, wherein the round nut is provided with a tightening screw.

5. The carbon sleeve roller as claimed in claim 4, wherein the fixed wing is a pin shaft, the pin shaft passes through a pin hole at the other end of the roller core and is welded, and two ends of the pin shaft are clamped with the notches in the carbon sleeve.