CN2593920Y

CN2593920Y - Three-roller diagonal rolling pipe mill

Info

Publication number: CN2593920Y
Application number: CN 03201379
Authority: CN
Inventors: 穆文山; 詹尊舜; 张戎国; 郑建华; 栾振珠; 王艳; 温新民; 鲁宇轩; 王丙顺; 曹中锋
Original assignee: Baotou Iron & Steel Design Res
Current assignee: Baotou Iron & Steel Design Res
Priority date: 2003-01-21
Filing date: 2003-01-21
Publication date: 2003-12-24
Anticipated expiration: 2013-01-21

Abstract

The utility model relates to a hot rolling device for a steel pipe and particularly relates to a three-roller diagonal rolling pipe mill. The utility model comprises an upper and a lower machine frames, a roller assembly, a roller regulation mechanism, a drum regulation device, a roller balance device and a roller transmission mechanism; three rollers have the same structures, mutually form an angle of 120 DEG and are alternatively arranged. The utility model is characterized in that the rollers adopt rollers of roller rings; roller rings and the roller shafts thereof form minor interference fit; at least one thin key is inserted between the roller rings and the roller shafts; a quick-open cylinder which uses hydraulic as dynamic force is arranged between the upper part of a bearing of each roller and a hydraulic balance device. The steel pipe rolled by the three-roller diagonal rolling pipe mill has high dimensional accuracy, and a tail triangle generation can be avoided; the problems of steel clamp and tail pipe loss are solved, the roller regulation is quick and convenient, and the investment is saved.

Description

Roller trio skew rolling pipe machine

Technical field

The utility model relates to a kind of hot finished steel pipe equipment, particularly a kind of roller trio skew rolling pipe machine.

Background technology

Three roller tube mills of public use at present generally are made up of frame, roll assembling, roll-adjusting gears, rotary drum adjustment, roll balance gear, roll transmission mechanism etc.Transmission device has fax moving, and hydraulic drive is also arranged.Three roll structures are identical, be in 120 ° arranges at interval.This device is provided with a cover at the pipe upstream end and dotes on big guider, is convenient to pipe and enters milling train smoothly.And roll is solid roller, and the external diameter of rolling hollow forging and wall thickness ratio D/S value can only reach about 15, as exceed the scope of D/S=15, when steel pipe rolling, will produce " tail triangle ", thereby cause steel-fastening during tail to pipe, and can't be by the roll of milling train.In order to address this problem, prior art has increased by a cover roll and has opened and managed tail pony rougher structure on milling train, but pipe tail pony rougher structure is difficult to harmonious in Dynamic Rolling Process with opening of milling train and roll in actual production, so cause fault frequently to occur, percent defective raises, and has increased equipment cost.Roll is the important composition parts of milling train, and the solid roller material consumption is more, and the roller-and-ring roll is strict because of heat treatment and build-up tolerance, and bad control easily causes cracking, and service life is short.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art and defective, and a kind of rolling accuracy height is provided, and can avoid producing rolled steel tube tail triangle, solves steel pipe steel-fastening and pipe tail loss problem, and the roller trio skew rolling pipe machine that dimension of roller is little, the life-span is long.

For reaching above-mentioned purpose, the utility model provides a kind of roller trio skew rolling pipe machine, comprise: upper spider, lower bearing bracket, roll assembling, roll-adjusting gears, rotary drum guiding mechanism, roll balance gear, roll transmission mechanism, upper spider and lower bearing bracket adopt Welding Structure, upper spider is by upper spider Driven by Hydraulic Cylinder closure, and by the locking hydraulic locking cylinder; The structure of three rolls is identical, be in 120 ° arranges at interval, each roll holds and hangs on the corresponding rotary drum, each rotary drum is locked and is fixed by hydraulic cylinder separately with upper and lower frame respectively, the corresponding rotary drum of the motor-driven of each rotary drum guiding mechanism, thereby the anglec of rotation of on frame, rotating the control rotary drum; The guiding mechanism of each roll is provided with transmission and checkout gear separately; Each roll is by a double-acting hydraulic cylinder balance roll, and hydraulic cylinder is installed in the centre position of roll, and head earrings and roll chock are hinged, and afterbody is connected with frame; It is characterized in that:

The roll of a. described roll assembling adopts the collar roll, and it comprises collar and roll shaft, adopts less interference fit between collar and its roll shaft, is inserted with at least one thin key between collar and roll shaft, and collar is a cone, and has a shoulder;

Be provided with between the bearing block top of b. described roll assembling and the roll adjusting device one with hydraulic pressure be power open oil cylinder soon, the switching of opening oil cylinder soon is by detecting and automatic controlling system.

The height δ of the shoulder that described collar had is 4～6mm.

The described stroke of opening oil cylinder soon is 20～30mm.

The utility model roller trio skew rolling pipe machine compared with prior art has the following advantages:

(1) the dimensional accuracy height of institute's rolled steel tube;

The godet device that (2) needn't set up an organization huge or other guide and guards, utilize roll to open oil cylinder soon and can realize opening fast of roll, steel pipe can in time be passed through when rolling final afterbody, avoided the generation of tail triangle, solved the problem of steel-fastening and the loss of pipe tail;

(3) roll adopts collars and axle interference fit to add Bao Jian, has both prolonged the life-span of roll, has reduced the size of roll again, and the adjustment of roll is quick and easy, reduces investment outlay.

Description of drawings

Fig. 1 always schemes for structural representation of the present utility model;

Fig. 2 adjusts structure chart for the roll that A-A direction among the utility model Fig. 1 is analysed and observe;

Fig. 3 is the installation diagram of the utility model roll.

The specific embodiment

Describe the specific embodiment of the present utility model in detail below in conjunction with drawings and Examples.

Please refer to Fig. 1～3, the utility model provides a kind of roller trio skew rolling pipe machine, comprise: upper spider 1, lower bearing bracket 2, roll assembling 3, roll-adjusting gears 4, rotary drum guiding mechanism 5, roll balance gear 6, roll transmission mechanism, upper spider and lower bearing bracket adopt the back steel plate to be welded, upper spider 1 is by upper spider Driven by Hydraulic Cylinder closure, the faying face of upper and lower frame is provided with the positioning key of X, Y two directions, and by 51 lockings of locking hydraulic cylinder; The structure of three rolls 7 is identical, be in 120 ° arranges at interval, each roll 7 holds and hangs on the corresponding rotary drum 8, each rotary drum 8 is locked and is fixed by hydraulic cylinder separately with upper and lower frame respectively, the corresponding rotary drum 8 of the motor-driven of each rotary drum guiding mechanism 5, thereby the anglec of rotation of on frame, rotating control rotary drum 8; The guiding mechanism 4 of each roll 7 is provided with transmission and checkout gear separately; Each roll 7 is by double-acting hydraulic cylinder 61 balance rolls 7, and hydraulic cylinder 61 is installed in the centre position of roll 7, and head earrings 62 is hinged with roll chock 11, and afterbody 63 is connected with frame; The roll 7 of described roll assembling 3 adopts the collar roll, it comprises collar 71 and roll shaft 9, adopt less interference fit between collar 71 and its roll shaft 9, between collar 71 and roll shaft 9, be inserted with at least one thin key 10, be a thin key 10 in the present embodiment, collar is a cone, and have one the height δ be the shoulder of 5mm; Between bearing block 11 tops of roll assembling 3 and roll adjusting device 4, be provided with one with hydraulic pressure be power open oil cylinder 12 soon, the switching of opening oil cylinder 12 soon is by detection and automatic controlling system, in the present embodiment, the piston stroke of opening oil cylinder 12 soon is 25mm.When rolling closing to an end of hollow forging, when opening oil cylinder 12 releases soon, its piston stroke is balanced by roll 7, makes three rolls 7 simultaneously away from rolling center, has realized opening fast of roll 7, allows hollow forging pass through milling train, avoids forming the tail triangle.

Utilize roller trio skew rolling pipe machine provided by the utility model rolling tube product size and part technological parameter as follows:

1. outer diameter of steel pipes D: 168 millimeters of  76～;

2. wall thickness S:4～26 millimeter;

3. wall thickness tolerance: 5%～8%;

Mill speed: 0.3～0.8 meter per second.

Claims

1. roller trio skew rolling pipe machine, comprise: upper spider (1), lower bearing bracket (2), roll assembling (3), roll-adjusting gears (4), rotary drum guiding mechanism (5), roll balance gear (6), roll transmission mechanism, upper spider and lower bearing bracket adopt Welding Structure, upper spider (1) is by upper spider Driven by Hydraulic Cylinder closure, and by locking hydraulic cylinder (51) locking; The structure of three rolls (7) is identical, be in 120 ° arranges at interval, each roll (7) holds and hangs on the corresponding rotary drum (8), each rotary drum (8) is locked and is fixed by hydraulic cylinder separately with upper and lower frame respectively, the corresponding rotary drum of motor-driven (8) of each rotary drum guiding mechanism (5), thereby the anglec of rotation of on frame, rotating control rotary drum (8); The guiding mechanism (4) of each roll (7) is provided with transmission and checkout gear separately; Each roll (7) is by a double-acting hydraulic cylinder (61) balance roll (7), and hydraulic cylinder (61) is installed in the centre position of roll (7), and head earrings (62) is hinged with roll chock (11), and afterbody (63) is connected with frame; It is characterized in that:

The roll (7) of a. described roll assembling (3) adopts the collar roll, it comprises collar (71) and roll shaft (9), adopt less interference fit between collar (71) and its roll shaft (9), between collar (71) and roll shaft (9), be inserted with at least one thin key (10), collar (71) is a cone, and has a shoulder;

Be provided with between bearing block (11) top of b. described roll assembling (3) and the roll adjusting device (4) one with hydraulic pressure be power open oil cylinder (12) soon, the switching of opening oil cylinder (12) soon is by detection and automatic controlling system.

2. roller trio skew rolling pipe machine according to claim 1 is characterized in that the height δ of the shoulder that described collar (71) is had is 4～6mm.

3. roller trio skew rolling pipe machine according to claim 1 is characterized in that, the described stroke of opening oil cylinder (12) soon is 20～30mm.