CN202061927U - Pinch roll with composite roll shape - Google Patents

Abstract

The utility model provides a pinch roll with a composite roll shape. The punch roll body is divided into three parts; the middle part of the roll body is a flat roll; and two side roll shape curves adopt multi-square curves. The proportion of the length of the middle part of the pinch roll body in the length of the roll body is 50 % to 80 %. As the two sides of the pinch roller are provided with the multi-square roll shape curves, the pinch roll shape can adapt to the change of the width of a strip steel, the contact form of the pinch roll body and the strip steel is improved, the pressure distribution along the length of the pinch roll body is more uniform, therefore, the abrasion degree of the pinch roll is reduced, the service life of the pinch roll is prolonged, the roll replacement times is reduced, and the strip steel reeling quality is guaranteed. Simultaneously, the transverse rigidity of the pinch roll can be increased, the middle deformation of the pinch roll can be reduced; and the harmful effects on the strip steel plate shape can be reduced.

Description

A kind of pinch roll with compound roll shape

Technical field

The utility model belongs to the mechanical equipment of steel rolling field, the coiling machine pinch roll that particularly a kind of hot rolling has compound roll shape in producing.

Background technology

The downcoiler pinch roll apparatus that hot-strip factory is used, the important component part that belongs to downcoiler, its major function are that band steel toe portion is prebended, and are convenient to be with steel guiding coiler mandrel, the holddown belt steel makes between pinch roll and the coiler mandrel and forms certain force of strain simultaneously.

Because pinch roll directly contacts with high temperate zone steel for a long time, make the serious wear of pinch roll on the strip width direction, along with the pinch roll wear extent increases, the effect of compression clamping band steel slowly descends, existing for preventing that sawtooth volume and turriform from rolling out, the scene often increases Withdrawal roll pressure.In addition, skidding can take place to the flexural deformation deficiency that band steel toe portion produces between band steel and the reel in pinch roll, and the scene also needs to increase Withdrawal roll pressure, make the band steel that enough prebucklings take place, take place between band steel and the reel when avoiding being with coil of strip to go into downcoiler " driving skids ".But increase the wearing and tearing that Withdrawal roll pressure can further aggravate pinch roll again, in actual use, the service life of pinch roll and smooth working phase in mid-term are too short, are unfavorable for giving full play to the production capacity of milling train.In addition, because pinch roll does not have backing roll system, and top pinch roll is weight reduction, generally adopt hollow roll, along with Withdrawal roll pressure increases, its upper and lower pinch roll amount of deflection can obviously increase, this can produce extra additional internal stress to the band steel, thereby influences the difficulty of online plate shape control.

Chinese patent publication number CN 2470018Y discloses a kind of coiling machine pinch roll of improveing roll forming, and its body of roll limit portion adopts the oblique line section, and band steel two ends are not contacted with the body of roll, reaches even body of roll wearing and tearing, prolongs the pinch roll purpose in service life.Yet,, be equivalent to increase the pressure of pinch roll on unit width, thereby strengthened the pinch roll wear extent to a certain extent on the contrary because it has shortened the contact length of pinch roll with the band steel.

Summary of the invention

But the purpose of this utility model is to provide a kind of pinch roll roll forming adaptive zone steel wide variety, improves the pressure distribution state of pinch roll, alleviates the coiling machine pinch roll with compound roll shape of the pinch roll degree of wear.

For this reason, the scheme taked of the utility model is:

A kind of pinch roll with compound roll shape comprises top pinch roll and bottom pinch roll, it is characterized in that, the described pinch roll body of roll is divided into three parts, and plain-barreled roll is adopted at body of roll middle part, and two limit portion roller curves adopt repeatedly square curve.

The ratio that described pinch roll body of roll middle part length accounts for barrel length is 50 ~ 80%, and the ratio that two limit portions of body of roll total length accounts for barrel length is 20 ~ 50%.

The equal in length of two limit portions of the described pinch roll body of roll, limit portion height of curve is 1 ~ 6mm.

Described pinch roll body of roll limit portion curve is biquadratic, five powers, six power curves.

Good effect of the present utility model is:

Because the pinch roll both sides of the utility model have repeatedly square roller curve, make the pinch roll roll shape can adapt to the variation of strip width, improve the pinch roll body of roll and the contact form of being with steel, more even along the pressure distribution on the pinch roll barrel length, thereby reduce the pinch roll degree of wear, prolong its service life, reduce the roll change number of times, guarantee the strip coiling quality.Simultaneously, can improve the lateral stiffness of pinch roll, reduce the amount of deflection of pinch roll, reduce harmful effect belt plate shape.

Description of drawings

Accompanying drawing is the pinch roll structural representation with compound roll shape.

Among the figure: top pinch roll 1, middle part plain-barreled roll part 2, limit portion roller curve part 3, bottom pinch roll 4.

The specific embodiment

By accompanying drawing as seen, the roller curve on the roll shape of pinch roll 1 and bottom pinch roll 4 and both sides is identical on the utility model, and just the roll shape parameter is distinguished to some extent.Top pinch roll 1 is divided into three parts with the body of roll of bottom pinch roll 4, it is the roller curve part 3 of body of roll middle part plain-barreled roll part 2 and two limit portions, middle part plain-barreled roll part 2 is a straight barrel, two repeatedly square curves that body of roll limit portion roller curve part 3 all adopts biquadratic, five powers and six powers to mix.

The ratio that the length of middle part plain-barreled roll part 2 accounts for barrel length is 50%, the ratio that the total length of limit portion roller curve part 3 accounts for barrel length also is 50%, the shape of two body of roll limit portion roller curve parts 3 is identical, the i.e. equal in length of two body of roll limit portion roller curve parts 3, limit portion height of curve is 5mm.

Claims (4)

1. the pinch roll with compound roll shape comprises top pinch roll and bottom pinch roll, it is characterized in that, the described pinch roll body of roll is divided into three parts, and plain-barreled roll is adopted at body of roll middle part, and two limit portion roller curves adopt repeatedly square curve.

2. the pinch roll with compound roll shape according to claim 1 is characterized in that, the ratio that described pinch roll body of roll middle part length accounts for barrel length is 50 ~ 80%, and the ratio that two limit portions of body of roll total length accounts for barrel length is 20 ~ 50%.

3. the pinch roll with compound roll shape according to claim 1 is characterized in that, the equal in length of two limit portions of the described pinch roll body of roll, and limit portion height of curve is 1 ~ 6mm.

4. the pinch roll with compound roll shape according to claim 1 is characterized in that, described pinch roll body of roll limit portion curve is biquadratic, five powers, six power curves.