JPH11290909A - Combination mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the work for changing roll chock assemblies, to shorten changing time, to make the work safe and to surely prevent miss rolls and breakage of machinery. SOLUTION: In a combination mill in which upper roll chock assemblies 12 having an upper horizontal roll 11, intermediate housing 14 having a pair of vertical rolls and lower roll chock assemblies 16 having a lower horizontal roll 15 are stacked up and fastened with plural prestressed rods 17, opening parts 28, 34, 44 into which the prestressed rods 17 are inserted in the horizontal direction are respectively provided on the upper roll chock assemblies 12, intermediate housing 14 and lower roll chock assemblies 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination mill for easily changing rolls in a combination mill for both a universal mill and a 2HI mill (horizontal double mill).

[0002]

2. Description of the Related Art Generally, in a steel mill of a steel mill, a large number of steel materials such as H-section steels and channel steels of various standard dimensions are rolled by a combination mill such as a universal mill. In consideration of the rolling reaction force during rolling, a roll chock assembly or the like to which each roll is attached is fastened by a prestress rod. As the pre-stress structure of the conventional combination mill,
For example, the one described in JP-B-63-49562 is known. In the universal mill described in this publication, an intermediate housing having a built-in vertical roll is detachably provided between the lower roll chock assembly and an eccentric sleeve lowering mechanism, and is inserted through the through holes of the three blocks. The four prestressed rods are screwed together with a screw at the upper end of the four prestressed rods and a nut, and a prestress is actuated by the operation of a single rod type prestressed cylinder provided at the lower end of the prestressed rod. One block has an integral structure. The intermediate housing is fixed by a stand clamp on a sole plate fixed to the floor. When rearranging the rolls of each block, the operation of the prestressing cylinder is released and the screw fastening is released. Roll chock assemblies are frequently replaced due to wear and breakage of rolls and bearings, especially in a steel mill where the finishing mill is a continuous mill type. Therefore, it is necessary to facilitate the replacement work and to reduce the time required for the replacement work as much as possible.

[0003]

However, the conventional combination mill has the following problems to be solved. When replacing the roll chock assembly, remove the nut of the thread at the upper end of the prestressed rod, and then raise the required roll chock assembly along the prestressed rod using a hoist, etc. , The replacement work was difficult, it took a long time to replace, and it was a dangerous work. In addition, since the prestressing cylinder that applies pressure to the prestressing rod is a single rod type, it is necessary to always apply hydraulic pressure during the rolling operation. Also, there is a problem that the machine is damaged.

The present invention has been made in view of such circumstances, and a combination mill which can easily replace a roll chock assembly, has a short replacement time, is safe, and can reliably prevent misrolling and mechanical damage. The purpose is to provide.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The combination mill described above is a combination mill in which an upper roll chock assembly having an upper horizontal roll, an intermediate housing having a pair of vertical rolls, and a lower roll chock assembly having a lower horizontal roll are stacked and fastened by a plurality of prestressed rods. In the above, each of the upper roll chock assembly, the intermediate housing and the lower roll chock assembly has an opening through which the prestress rod can be inserted in a horizontal direction. A combination mill according to a second aspect of the present invention is the combination mill according to the first aspect, wherein a hydraulic cylinder portion of a double rod type having a part of the prestress rod is formed at an upper end or a lower end of the prestress rod. doing. A combination mill according to a third aspect is the combination mill according to the first or second aspect, wherein the lower roll chock assembly is provided with wheels.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIGS. 1 (A), (B),
FIG. 2C is a perspective view of an upper roll chock assembly, an intermediate housing, and a lower roll chock assembly that constitute a combination mill according to an embodiment of the present invention, and FIG. 2 is a partially cutaway front view of the combination mill.

As shown in FIGS. 1 and 2, a combination mill 10 according to an embodiment of the present invention includes an upper roll chock assembly 12 having an upper horizontal roll 11.
, An intermediate housing 14 containing a vertical roll chock 13 having a pair of opposed vertical rolls (not shown), and a lower roll chock assembly 1 having a lower horizontal roll 15.
6 and four prestress rods 17 for fastening the upper roll chock assembly 12, the intermediate housing 14, and the lower roll chock assembly 16. Hereinafter, these will be described in detail with reference to the drawings.

The upper roll chock assembly 12 includes:
An upper horizontal roll 11 is attached to an upper horizontal chock 18 via a roll neck bearing and an eccentric sleeve 19. Also, as shown in FIG.
As shown in FIG. 2, a worm shaft 22 is provided with a power of an electric motor 20 provided on both sides through a worm speed reducer 21 as shown in FIG.
Gear 2 formed on the worm shaft 22
3 rotates around the roll neck bearing by meshing with a worm wheel gear 24 attached to a part of the outer periphery of the eccentric sleeve 19, whereby the upper horizontal roll 1 rotatably supported by the roll neck bearing.
1 can be reduced. As shown in FIG.
The output shafts 21a of the two worm reducers 21 are connected via a coupling 25, and the eccentric sleeves 19 on both sides are connected.
Are rotated synchronously. An electric motor 20 for rotating the eccentric sleeve 19, a worm reducer 21,
An eccentric pressure reduction mechanism 26 includes the worm shaft 22, the worm wheel gear 24, and the like.

When the upper horizontal chock 18 is viewed in a plan view, the left and right, front and rear projections 27 are provided on the combination mill 10.
At the time of assembling, an opening 28 is formed in a U-shaped section at the center of the tip so that the prestress rod 17 can be inserted from the horizontal direction. The opening 2 of the protruding portion 27
A small piece having a U-shape in cross section attached on 8 represents the positioning member 29.

On both sides of the intermediate housing 14, mounted are vertical roll pressing mechanisms 30 for adjusting the gap between a pair of vertical rolls provided on the vertical roll chocks 13 facing each other. As shown in FIG. 1B, the vertical roll pressing mechanism 30
The worm shaft 32 is rotated by the electric motor 31, and the rotation of the worm shaft 32 rotates two rotary pressure lower shafts 33 having a worm wheel gear meshing with the worm gear of the worm shaft 32. The two rotary screw shafts 33 are arranged at a predetermined interval, and the male screw at the tip engages with a female screw formed on the back side of the vertical roll chock 13 guided in the horizontal direction by the intermediate housing 14. . Therefore, the electric motor 31
The vertical roll chock 13 can be moved forward and backward without generating an eccentric load by the synchronous rotation of the two rotary pressure lower shafts 33 by the rotation of.

An opening 34 is formed in the intermediate housing 14 at a position corresponding to the four protruding portions 27 when the upper horizontal chock 18 is placed, and the opening 34 is formed in a U-shape in cross section. It can be inserted from. A positioning member 35 is also mounted on the opening 34. Reference numeral 36 in FIG. 1B indicates a mounting seat fixed by a stand clamp on a sole plate 36a fixed to the floor surface.

The lower roll chock assembly 16 has an eccentric pressure lowering mechanism 37, and has basically the same structure as the upper roll chock assembly 12, so that only the reference numerals are used and detailed description is omitted. Reference numeral 38 denotes an electric motor, reference numeral 39 denotes a worm speed reducer, reference numeral 39a denotes an output shaft of the worm speed reducer 39, reference numeral 40 denotes a worm shaft, reference numeral 41 denotes a worm gear, reference numeral 42 denotes a worm wheel gear, reference numeral 43 denotes a projecting portion, and reference numeral 44 Denotes a U-shaped opening in cross section, and reference numeral 45 denotes a positioning member. Reference numeral 46 denotes a positioning member provided at the lower end of the protrusion 43.

At the upper end of the prestressed rod 17, a double rod type hydraulic cylinder part 47 which uses a part of the prestressed rod 17 as a rod is formed. As shown in FIG. 2, the hydraulic cylinder section 47 has a cylinder 49 to which the piston 48 of the prestressed rod 17 is attached, and on which the outer peripheral surface of the piston 48 slides. A through hole 50 through which the prestress rod 17 slides is formed on the head side of the cylinder 49 and is sealed by a sealing material 51. The prestress rod 17 slides on the rod side by a sealing material (not shown). A cylinder cover 53 having a through hole 52 is attached. A hydraulic supply (or discharge) port (not shown) is formed on each of the head side and the rod side of the cylinder 49, and a hydraulic pipe is connected to the hydraulic supply port. At the lower end of the prestressed rod 17, a positioning nut 54 corresponding to the positioning member 46 is set on the back surface as shown in FIG.
Is formed with a male screw portion 56 into which the screws are screwed. A male screw portion 58 is formed from an intermediate position of the hydraulic cylinder portion 47 of the prestress rod 17 to a distal end portion thereof, to which a mounting nut 57 set on the back surface of the cylinder cover 53 is screwed.

Therefore, as shown in FIG. 2, the upper roll chock assembly 12, the intermediate housing 14, and the lower roll chock assembly 16 are stacked and positioned, and the prestress rod 17 is inserted into the openings 28, 34, 44 from the side, and the hydraulic pressure is reduced. When pressure oil is supplied to the head side of the cylinder part 47, the piston 48 rises, and a tensile force acts on the prestress rod 17 between the piston 48 and the mounting nut 55. In this state, the mounting nut 57 is screwed. To set on the back of the cylinder cover 53. In this state,
A tensile force acts on the prestressing rod 17 between the mounting nut 57 and the mounting nut 55, and the upper roll chock assembly 12, the intermediate housing 14, and the lower roll chock assembly 16
It is firmly fastened and can withstand rolling resistance during rolling. Reference numeral 62 in FIG. 2 denotes a wheel provided below the lower roll chock assembly 16 via a bearing (not shown), reference numeral 59 denotes a positioning member corresponding to the positioning member 29, and reference numeral 60 denotes a positioning member 35. Reference numeral 61 denotes a positioning member corresponding to the positioning member 45. The positioning member 59 and the positioning member 29, and the positioning member 60 and the positioning member 3
5. The positioning members 61 and 45, and the positioning members 46 and 54 have an automatic alignment structure.

Next, an operation of exchanging roll chocks to which the combination mill 10 according to one embodiment of the present invention is applied will be described with reference to the drawings. It is assumed that the state before the replacement is as shown in FIG. First, pressure oil is supplied to the head side of the hydraulic cylinder portion 47 of the four prestressed rods 17 to apply a force larger than the tensile force during the rolling operation, so that the back surface of the cylinder cover 53 and the mounting nut 57 are connected. Release the contact state, and in this state mount nut 5
7 is loosened while rotating, and removed from the upper end of the prestress rod 17 to stop the supply of the pressure oil.

Next, the four prestressing rods 17 are moved to the outside of the combination mill 10 and detached from the combination mill 10, and then the upper roll chock assembly 12, the intermediate housing 14, and the lower roll chock assembly 16 are replaced. Take out the items, stack and position them, including new ones in place of the ones taken out. Thereafter, the four prestress rods 17 are inserted into the openings 28, 34, and 44 from the outside of the combination mill 10, and pressurized oil is supplied to the head side of the hydraulic cylinder unit 47 to raise the piston 48. After tightening the mounting nut 57 at a position where a predetermined tensile force is obtained, the supply of the pressure oil is stopped, and the replacement operation is completed. In the state where the replacement work has been completed, the tensile force of the hydraulic cylinder portion 47 does not act on the prestressed rod 17, and the tension between the mounting nut 57 at the upper end of the prestressed rod 17 and the mounting nut 55 at the lower end is reduced. The tensile force is acting.

Therefore, when replacing the roll chock assembly or the like, it is not necessary to raise the required roll chock assembly along the prestressed rod using a hoist or the like as in the prior art, so that the replacement work can be facilitated and the replacement is facilitated. Can be performed in a short time and can be performed safely. Further, since the hydraulic cylinder portion 47 for applying a tensile force to the prestress rod 17 is not a single rod type as in the conventional case but a double rod type, it is not necessary to constantly apply hydraulic pressure during the rolling operation. Problems such as mis-rolling and mechanical breakage can be reliably prevented.

In the above-described embodiment, the hydraulic cylinder portion 47 is formed at the upper end of the prestressed rod 17, but if necessary, the hydraulic cylinder portion 47 may be formed at the lower end of the prestressed rod. Good.

[0019]

According to the combination mill of the present invention, the upper roll chock assembly, the intermediate housing and the lower roll chock assembly each have an opening through which a plurality of prestress rods can be inserted in the horizontal direction. The replacement work of the assembly can be performed easily, in a short time, and safely. In particular, in the combination mill according to the second aspect, since a double rod type hydraulic cylinder part having a part of the prestress rod as a rod is formed at the upper end or the lower end of the prestress rod, Since it is not necessary to always apply hydraulic pressure to the oil pressure, it is possible to reliably prevent problems such as misrolling and mechanical damage caused by a decrease in oil pressure. In the combination mill according to the third aspect, since the lower roll chock assembly is provided with wheels, the off-line conveyance operation is facilitated, and the workability is improved.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are perspective views of an upper roll chock assembly, an intermediate housing, and a lower roll chock assembly that constitute a combination mill according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the combination mill.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Combination mill 11 Upper horizontal roll 12 Upper roll chock assembly 13 Vertical roll chock 14 Intermediate housing 15 Lower horizontal roll 16 Lower roll chock assembly 17 Prestress rod 18 Upper horizontal chock 19 Eccentric sleeve 20 Electric motor 21 Worm reducer 21a Output shaft 22 Worm shaft 23 Worm gear 24 Worm wheel gear 25 Coupling 26 Eccentric reduction mechanism 27 Projection 28 Opening 29 Positioning member 30 Vertical roll reduction mechanism 31 Electric motor 32 Worm shaft 33 Rotation reduction shaft 34 Opening 35 Positioning member 36 Mounting seat 36a Sole plate 37 Eccentric Reduction mechanism 38 Electric motor 39 Worm reduction gear 39a Output shaft 40 Worm shaft 41 Worm gear 42 Worm wheel gear 43 Projecting part 44 Opening part 45 Positioning member 46 Positioning member 47 Hydraulic cylinder part 48 Piston 49 Cylinder 50 Through hole 51 Seal material 52 Through hole 53 Cylinder cover 54 Positioning member 55 Mounting nut 56 Male screw part 57 Mounting nut 58 Male screw part 59 Positioning member 60 Positioning member 61 Positioning member 62 Wheel

Claims (3)

[Claims] 1. A combination mill in which an upper roll chock assembly having an upper horizontal roll, an intermediate housing having a pair of vertical rolls, and a lower roll chock assembly having a lower horizontal roll are stacked and fastened by a plurality of prestressed rods. A combination mill, wherein each of the upper roll chock assembly, the intermediate housing and the lower roll chock assembly has an opening through which the prestress rod can be inserted in a horizontal direction. 2. The combination mill according to claim 1, wherein a hydraulic cylinder portion of a double rod type having a part of the prestress rod as a rod is formed at an upper end or a lower end of the prestress rod. 3. The combination mill according to claim 1, wherein the lower roll chock assembly is provided with wheels.