RU2345852C2 - Two-high operating stand of helical-rolling stand rolling - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: two-high operating stand helical-rolling stand rolling contains stand, drums with installed in its bottom part rotary block, located in drums working roll, swiveling device of drums for feed angle. Swiveling device of drums for feed angle are implemented in the form of coaxial located thrust screw and hydraulic tappet, which are installed in cover of rolling mill stand. Each drum is outfitted by additional hydraulic tappet, located in rolling mill stand and cooperating with installed in bottom part of drum rotary block, and additional rotary block, mounted in the top part of drum. Each tilting gear of drum for feed angle cooperating with additional rotary block.

EFFECT: reliability growth and durability increasing of structure of two-high operating stand helical-rolling stand rolling, expansion of its technological abilities and maintenance improving.

2 dwg

Description

The invention relates to the field of pipe production and relates to improving the design of the mechanisms of rotation of the drums in a two-roll working stand of the cross-helical rolling mill.

In the known working stands of cross-helical rolling mills containing drums with work rolls, the mechanisms for turning the drums to the feed angle are usually located in the bed of the working stand, in the zone of action of water and scale, which adversely affects the reliability and durability of the stand and the convenience of its maintenance. In addition, the designs of these mechanisms do not provide a tight pressing of the drums to the supporting surface of the bed, and also do not give the possibility of changing the feed angle of the rolls during the rolling process. The invention addresses these drawbacks.

The known design of a two-roll working stand of the cross-helical rolling mill, see.with. USSR No. 1792757, cl. B21B 19/02, claimed 01/10/2010, publ. 02/07/93, containing a bed, drums with rotary crackers installed in their lower part, work rolls placed in the drums, mechanisms for rotating the drums at the feed angle. Each mechanism of rotation of the drum is made in the form of coaxially located in the frame of the working stand on both sides of the rotary cracker and the thrust screw and pusher interacting with it. The stop screw and pusher have electromechanical drives. The pusher is made in the form of a spring-loaded rod and a hollow screw pivotally connected to it, through which a rod is passed, fixed at one end to the rod and the other in contact with the latch.

The main drawback of the design of this two-roll working stand is the location of the drum rotation mechanisms, made in the form of a thrust screw and pusher coaxially located in the frame of the working stand with electromechanical drives, in the zone of water and scale, which reduces the reliability and durability of the stand, and also makes it difficult to maintain .

Another drawback of the design of the two-roll working stand is the large dimensions of the electromechanical drives of the drum rotation mechanisms, which also complicates the maintenance of the working stand.

A further drawback of the design of this working stand is that it does not provide a tight pressing of the drums to the supporting surface of the bed due to the absence of a rigid connection between the rotary cracker, the stop screw and the pusher of the mechanisms for rotating the drums, which also reduces the reliability and durability of the working stand.

Another drawback of the design of the working stand is the impossibility of changing the feed angle during the rolling process due to the low speeds of the electromechanical drive of the thrust screw and the presence of only one pusher.

Of the known designs of two-roll working stands of transverse helical rolling mills, the closest in technical essence is the design of a two-roll working stand described in A.S. USSR No. 929288, cl. BHH 1/14, declared October 13, 80, publ. 05/23/82

This design of a two-roll working stand contains a bed, drums with rotary crackers installed in their lower part, work rolls placed in the drums, and mechanisms for rotating the drums at the feed angle. Each mechanism of rotation of the drum is made in the form of a coaxially arranged in the frame of the working stand on both sides of the rotary cracker and the thrust screw interacting with it with an electromechanical drive and a hydraulic pusher. The rod of the hydraulic pusher is pivotally connected to the rod of the hydraulic cylinder.

The main disadvantage of this design of the two-roll working stand, as well as the previous one, is the location of the drum rotation mechanisms made in the form of a thrust screw with an electromechanical drive and a hydraulic pusher coaxially located in the bed of the working stand, in the zone of water and scale, which reduces the reliability and durability of the stand , and also complicates its maintenance.

Another drawback of the design of this working stand as well as the previous one is that it does not provide tight pressing of the drums to the supporting surface of the bed due to the absence of a rigid connection between the rotary cracker, thrust screw and hydraulic pusher of the drum rotation mechanisms, which also reduces the reliability and durability of the working stand.

Another drawback in the design of the working stand is due to the impossibility of changing the feed angle during the rolling process due to the low speeds of the electromechanical drive of the thrust screw and the presence of only one hydraulic pusher.

The objective of the present invention is to increase the reliability and durability of the design of the two-roll working stands of the helical rolling mill, expanding its technological capabilities and improving service.

The task is achieved by the fact that in a two-roll working stand of a cross-helical rolling mill containing a bed, drums with rotary crackers installed in their lower part, work rolls placed in the drums, mechanisms for turning the drums at the feed angle, each of which is made in the form of coaxially arranged thrust screw and hydraulic pusher interacting with the rotary cracker of the drum, according to the invention, each drum is equipped with an additional hydraulic pusher located in the frame eyes of the stand and interacting with a rotary cracker installed at the bottom of the drum and an additional rotary cracker mounted in the upper part of the drum, and the mechanisms for rotating the drums at the feed angle, made in the form of coaxially arranged stop screw and hydraulic pusher, are installed in the provided cover of the working stand frame with the possibility of interaction with an additional rotary cracker.

Such a constructive implementation of the two-roll working stand allows to increase its reliability and durability, as well as to improve its maintenance due to the fact that the rotation mechanisms of the working stand drums, made in the form of coaxially arranged stop screw with an electromechanical drive and a hydraulic pusher, are installed in the cover of the working stand stand, then there is outside the range of water and scale, and the hydraulic cylinder of the additional pusher, located in the bed of the working stand, can be reliably protected from exposure of the above factors.

In addition, the reliability and durability of the working stand is enhanced by the presence of two pushers in each drum rotation mechanism, which, as a result of the action of hydraulic cylinders and interaction with rotary crackers, tightly press the drums to the supporting surface of the bed, thereby eliminating unnecessary gaps.

The technological capabilities of the proposed two-roll working stand are expanded due to the possibility of changing the feed angle during the rolling process as a result of turning the drum clockwise and counterclockwise with the help of two hydraulic pushers included in each drum with the stationary thrust screw.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows a two-roll working stand of the rolling mill,

figure 2 is the same, a section aa in figure 1.

The two-roll working stand of the helical rolling mill comprises a frame 1 with a cover 2, drums 3 with work rolls 4 located therein, and mechanisms for rotating the drums at the feed angle. Each drum 3 is equipped with two rotary crackers 5 and 6, while the cracker 5 is installed in the upper part of the drum, and the cracker 6 in its lower part.

Each drum rotation mechanism comprises a stop screw 7 coaxially located in the cover 2 of the bed 1 and a hydraulic pusher 8, interacting with the rotary cracker 5 installed in the upper part of the drum 3.

To install the thrust screw 7 in the required position, an electromechanical drive 9 with a worm gear 10 is used. To rotate the drum clockwise, the pusher 8 is moved using the hydraulic cylinder 11, the rod 12 of which is pivotally connected to the pusher 8.

In addition, each drum rotation mechanism is equipped with a hydraulic pusher 13 located in the bed of the working stand and interacting with a cracker 6 installed in the lower part of the drum. To rotate the drum counterclockwise, the pusher 13 is moved using a hydraulic cylinder 14, the rod 15 of which is pivotally connected to the pusher 13 .

Prior to adjusting the rolls 4 to the required feed angle, the drums 3 are installed using hydraulic pushers 8 and 13 in a position in which the rotary cracker 5 fixed in their upper part does not come into contact with the stop screw 7.

When setting each roll 4, the stop screw 7 is set using the electromechanical drive 9 to the desired feed angle, then the pressure is applied to the hydraulic cylinders 11, 14 and using the pushers 8, 13 interacting with the rotary crackers 5 and 6, respectively, the drum 3 is rotated until the rotary contact crackers 5 with a thrust screw 7 and tightly press the drum 3 to the supporting surface S of the bed 1 of the working stand.

During the rolling process, the stop screw 7 is adjusted to a specific feed angle. The adjustment of the feed angle during the rolling process is performed by turning the drums 3 using the hydraulic pushers 8 and 13 interacting with breadcrumbs 5 and 6 clockwise or counterclockwise.

Thus, the proposed design of a two-roll working stand of the cross-helical rolling mill allows to increase its reliability and durability, expand technological capabilities and improve service.

Claims (1)

A two-roll working stand of a cross-helical rolling mill, containing a bed, drums with rotary crackers installed in their lower part, work rolls placed in the drums, drum rotation mechanisms at the feed angle, each of which is made in the form of a coaxially positioned stop screw and a hydraulic pusher interacting with a rotary drum cracker, characterized in that each drum is equipped with an additional hydraulic pusher located in the bed of the working stand and interacting with the installation a rotary cracker in the lower part of the drum, and an additional rotary cracker mounted in the upper part of the drum, and the mechanisms of rotation of the drums at the feed angle, made in the form of a coaxially arranged stop screw and hydraulic pusher, are installed in the provided cover of the working stand frame with the possibility of interaction with an additional rotary cracker.

Images