CN202403526U

CN202403526U - Cantilevered roll

Info

Publication number: CN202403526U
Application number: CN201220010853XU
Authority: CN
Inventors: 杨思安; 李中华; 赵旺
Original assignee: Yangzhou Metallurgical Machinery Co Ltd
Current assignee: Yangzhou Metallurgical Machinery Co Ltd
Priority date: 2012-01-11
Filing date: 2012-01-11
Publication date: 2012-08-29
Anticipated expiration: 2022-01-11

Abstract

The utility model discloses a cantilevered roll, and in particular relates to improvement of a roll head structure of the cantilevered roll on a step furnace. The cantilevered roll comprises a roll head and a roll shaft, wherein the roll head is sheathed outside the roll shaft, and the cantilevered roll further comprises a locating sleeve and a locating pin; the locating sleeve is arranged between the roll head and the roll shaft, and the locating sleeve is fixedly connected to the roll shaft; an axial locating pinhole is arranged between the outer surface of the end in the locating sleeve and the inner surface of the end in the locating sleeve, and the locating pin is arranged in the locating pinhole; the roll head is circumferentially fixed relative to the locating sleeve; a step hole is arranged on the edge of the inner port of the roll head, a baffle ring is arranged in the step hole, and the inner surface of the baffle ring is fixedly connected with the roll shaft; and the baffle ring is axially fixed relative to the roll shaft. According to the utility model, the service life of the roll head is effectively prolonged, and the connection reliability is greatly improved.

Description

Overhang roll

Technical field

The utility model relates to walking-beam furnace, relates in particular to the improvement of the overhang roll roller header structure on the walking-beam furnace.

Background technology

In actual production is used; Walking-beam furnace overhang roll roller head often damages easily; The form of its damage mainly is that the collet play causes and can't continue normal use; This is main cause and the restriction roller-way principal mode in service life that the overhang roll roller-way damages, and this damage accounts for such roller-way damage amount about 80%.

In assembling process, the body of roll of roller (roller head) on roll shaft, is circumferentially located through key through the interference fit hot charging for to be sleeved on the heat-resisting collet on the axle, and axial restraint leans on inboard end face and roll shaft welding location; Yet problem just goes out in the axial restraint part, and axial restraint has only been used interference fit and inboard end face and roll shaft welding location, and this kind locate mode is inoperative basically under this special environment for use in furnace rolls road,

Because roller-way turns round under hot environment for a long time; Roll shaft is different with roller head (collet) material; Thermal coefficient of expansion a different (roller head nickel alloy steel under the environment of 700 ~ 1000oC is being: 17.6*10-6, roll shaft are that carbon steel is 14.7*10-6 under uniform temp), the thermal deformation that uniform temp is produced down is different, and roll shaft adopts inner water-cooled in design; About the about 35oC of temperature; Thereby it is about about 750 oC of both temperature difference of dry combustion method that the roller head then is close to, and the roller head is 2.6mm with respect to the swell increment of roll shaft through calculating minimum in this temperature range, deducts original hot charging magnitude of interference 0.5mm; The actual free gap that produces 2.1mm, therefore the interference of original design location loses positioning action; Simultaneously receive very big distortion tension, make weld cracking and lose positioning function in the commissure.Impact and material loading pushes away under the steel active force at steel billet, just produced spacer and scurried and split phenomenon.

The utility model content

The utility model provides a kind of simple in structure to above problem, guarantees the stability of mechanical connection under the temperature variations significantly, improves the reliability of roller head and the overhang roll in service life.

The technical scheme of the utility model is: comprise roller head and roll shaft, said roller headgear is located at outside the said roll shaft, also comprises positioning sleeve and alignment pin;

Between that said positioning sleeve is located at said roller head and the roll shaft, and said positioning sleeve is fixedly connected on the said roll shaft;

Between the inner surface of the outer surface of said positioning sleeve inner termination and said roller head inner termination, offer the axial location pin-and-hole, said alignment pin is located in the said dowel hole; Make said roller head circumferentially fixing with respect to said positioning sleeve;

The inner peristoma of said roller head place offers stepped hole, and said baffle ring is located in the said stepped hole, and the inner surface of baffle ring is fixedly connected with said roll shaft; Make said baffle ring with respect to said roll shaft axial restraint.

The inner surface of said roller head inner termination also is provided with boss, and the outer surface of said positioning sleeve external end head is provided with the step circle adaptive with said boss.

Said positioning sleeve is the axial subdivision structure, makes the cross section of positioning sleeve be the arc of 1/2-1/6 circumference.

Said positioning sleeve end face is provided with screwed hole, makes said positioning sleeve and roller head flexibly connect.

Offer axial location pin-and-hole two between said roller head external end head inner surface and the said roll shaft external end head outer surface, said alignment pin two stretches into said dowel hole two.

The utility model elder generation puts into positioning sleeve after the inner adjustment of the roller head location, squeezes into alignment pin, and whole again and roll shaft is installed, adjustment roller head, and welding positioning sleeve in relevant position welds baffle ring and other end blanking cover again on axle.Owing to adopt the mode of mechanical positioning; Improved roller header structure; Avoided the material of unlike material directly to weld; Under the influence of thermal expansion, the roller head can not influence weld strength in radial direction free wxpansion, has upwards limited the rotation of spindle nose and has transmitted moment of torsion owing to the effect that alignment pin is arranged in week.The utility model has effectively improved the service life of roller head, improves the reliability that connects greatly.

Description of drawings

Fig. 1 is the structural representation of the utility model,

Fig. 2 is the cutaway view of A-A face among Fig. 1,

Fig. 3 is the half sectional view of positioning sleeve;

1 is the roller head among the figure, the 10th, and boss, the 2nd, positioning sleeve, the 20th, screwed hole, the 3rd, alignment pin, the 30th, alignment pin two, 4th, baffle ring, the 5th, roll shaft.

The specific embodiment

The utility model comprises roller head 1 and roll shaft 5 shown in Fig. 1-3, said roller head 1 is set in outside the said roll shaft 5, also comprises positioning sleeve 2 and alignment pin 3;

Between that said positioning sleeve 2 is located at said roller the head 1 and roll shaft 5, and said positioning sleeve 2 is fixedly connected on the said roll shaft 5; Relevant position welding stationary positioned cover 2 is fixed on the roll shaft 5 it on roll shaft 5, because positioning sleeve 2 thinner thicknesses, material are with roll shaft 5 consistent its soldering reliabilities that guarantee; And be close to roll shaft 5 outer walls; Cooling condition is better relatively, and weld seam is not easy to throw off, and can guarantee the reliability of location.

Between the inner surface of the outer surface of said positioning sleeve 2 inner termination and said roller head 1 inner termination, offer the axial location pin-and-hole, said alignment pin 3 is located in the said dowel hole; Make said roller head 1 circumferentially fixing with respect to said positioning sleeve 2;

Said roller head 1 inner peristoma place offers stepped hole, and said baffle ring 4 is located in the said stepped hole, and the inner surface of baffle ring 4 is fixedly connected with said roll shaft 5; Make said baffle ring 4 with respect to said roll shaft 5 axial restraints.

The inner surface of said roller head 1 inner termination also is provided with boss 10, and the outer surface of said positioning sleeve 2 external end heads is provided with the step circle adaptive with said boss 10.Can process the big (> 2mm of fit clearance) install with convenient.

Said positioning sleeve 2 is the axial subdivision structure, makes the cross section of positioning sleeve 2 be the arc of 1/2-1/6 circumference.

Said positioning sleeve 2 end faces are provided with screwed hole 20, make said positioning sleeve 2 and roller head 1 flexibly connect, the convenient installation and taking-up.

Offer axial location pin-and-hole two between said roller head 1 external end head inner surface and the said roll shaft 5 external end head outer surfaces, said alignment pin 2 30 stretches into said dowel hole two.

Claims

1. overhang roll comprises roller head and roll shaft, and said roller headgear is located at outside the said roll shaft, it is characterized in that, also comprises positioning sleeve and alignment pin;

2. overhang roll according to claim 1 is characterized in that, the inner surface of said roller head inner termination also is provided with boss, and the outer surface of said positioning sleeve external end head is provided with the step circle adaptive with said boss.

3. overhang roll according to claim 1 and 2 is characterized in that said positioning sleeve is the axial subdivision structure, makes the cross section of positioning sleeve be the arc of 1/2-1/6 circumference.

4. overhang roll according to claim 3 is characterized in that, said positioning sleeve end face is provided with screwed hole, makes said positioning sleeve and roller head flexibly connect.

5. overhang roll according to claim 1 is characterized in that, offers axial location pin-and-hole two between said roller head external end head inner surface and the said roll shaft external end head outer surface, and said alignment pin two stretches into said dowel hole two.