JP3639717B2 - Combination mill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combination mill for easily changing the rolls in a combination mill that is also used as a universal mill and a 2HI mill (horizontal double mill).
[0002]
[Prior art]
In general, at steel mills, many types of steel materials such as H-shaped steel and grooved steel with various standard dimensions are rolled by a combination mill such as a universal mill. A roll chock assembly or the like to which each roll is attached in consideration of the reaction force is fastened by a prestress rod.
As a prestress structure of a conventional combination mill, for example, the one described in Japanese Patent Publication No. 63-49562 is known. In the universal mill described in this publication, an eccentric sleeve reduction mechanism is provided, and an intermediate housing containing a scissors roll is detachably disposed between the lower roll chock assemblies and is inserted into the through holes of the three blocks. The four pre-stress rods are fastened with screws and nuts at the upper ends of the four pre-stress rods, and pre-stress is applied by the operation of a single rod type pre-stress cylinder provided at the lower end of the pre-stress rod. Two blocks are integrated. The intermediate housing is fixed by a stand clamp on a sole plate fixed to the floor surface. When the rolls of each block are rearranged, the operation of the prestress 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 shape steel factory with a continuous mill type finishing mill, because the number of rolling mills (mills) is large and replacement work is difficult. Therefore, it is necessary to facilitate this replacement work and to shorten the time required for the replacement work as much as possible.
[0003]
[Problems to be solved by the invention]
However, the conventional combination mill still has the following problems to be solved.
When replacing the roll chock assembly, remove the nut from the upper end of the prestress rod, and then lift the required roll chock assembly along the prestress rod using a lifting machine, etc. Since it was removed from the machine, the replacement work was difficult, took a long time, and was dangerous.
Also, since the pre-stress cylinder that applies pressure to the pre-stress rod is a single rod type, it is necessary to always apply oil pressure during the rolling operation, but if the oil pressure decreases during the rolling operation, misroll In addition, there was a problem that the machine was damaged.
[0004]
The present invention has been made in view of such circumstances, and provides a combination mill that is easy to replace a roll chock assembly, has a short replacement time, is safe, and can reliably prevent misrolls and machine damage. With the goal.
[0005]
[Means for Solving the Problems]
The combination mill according to claim 1, which meets the above object, includes a plurality of pre-stacked upper roll chock assemblies having an upper horizontal roll, an intermediate housing having a pair of reed rolls, and a lower roll chock assembly having a lower horizontal roll. In a combination mill that is fastened by a stress rod,
The upper roll chock assembly, the intermediate housing and the lower roll chock assembly are each provided with an opening through which the prestress rod can be inserted in a horizontal direction,
Formed on the upper end or lower end of the pre-stress rod is a double-rod type hydraulic cylinder having a part of the pre-stress rod as a rod, and the rod on the tip side of the hydraulic cylinder is A male screw portion is formed in which a mounting nut set on the back surface of the cylinder cover of the hydraulic cylinder portion is screwed .
A combination mill according to a second aspect is the combination mill according to the first aspect , wherein the lower roll chock assembly is provided with wheels.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
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. It is a partially cutaway front view of a combination mill.
[0007]
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 and a pair of opposite roll rolls (not shown). 13, a lower roll chock assembly 16 having a lower horizontal roll 15, and four prestress rods 17 for fastening the upper roll chock assembly 12, the intermediate housing 14 and the lower roll chock assembly 16. It is configured. Hereinafter, these will be described in detail with reference to the drawings.
[0008]
In the upper roll chock assembly 12, the upper horizontal roll 11 is attached to the upper horizontal chock 18 via a roll neck bearing and an eccentric sleeve 19. Further, as shown in FIG. 1A, the eccentric sleeve 19 transmits the power of the electric motor 20 provided on both sides to the worm shaft 22 via the worm reducer 21 as shown in FIG. The worm gear 23 formed on the shaft 22 rotates around the roll neck bearing by meshing with the worm wheel gear 24 attached to a part of the outer periphery of the eccentric sleeve 19, thereby rotating and supporting the roll neck bearing. The horizontal roll 11 can be reduced. As shown in the figure, the output shafts 21a of the two worm reducers 21 are connected via a coupling 25 so that the eccentric sleeves 19 on both sides rotate synchronously. An eccentric reduction mechanism 26 includes an electric motor 20 for rotating the eccentric sleeve 19, a worm speed reducer 21, a worm shaft 22, a worm wheel gear 24, and the like.
[0009]
The center portion of the tip portion of the upper horizontal chock 18 is viewed in cross section so that the pre-stress rod 17 can be inserted from the horizontal direction into the four protrusions 27 on the left, right, and front and rear in the plan view. An opening 28 is formed in a U shape. A small piece in a U-shape in cross section attached on the opening 28 of the protrusion 27 represents the positioning member 29.
[0010]
On both sides of the intermediate housing 14, a heel roll reduction mechanism 30 that adjusts the gap between a pair of heel rolls provided on the opposing heel roll chock 13 is attached. As shown in FIG. 1 (B), the heel roll reduction mechanism 30 rotates two worm shafts 32 by rotating the worm shaft 32 by an electric motor 31 and meshing with the worm gear of the worm shaft 32 by the rotation of the worm shaft 32. The shaft 33 is configured to rotate. The two rotary pressure lower shafts 33 are arranged at a predetermined interval, and the male screw at the tip meshes with the female screw formed on the back side of the heel roll chock 13 guided in the horizontal direction by the intermediate housing 14. . Therefore, the coffin roll chock 13 can be advanced and retracted without causing an unbalanced load by the synchronous rotation of the two rotary pressure lower shafts 33 by the rotation of the electric motor 31.
[0011]
The intermediate housing 14 is also formed with an opening 34 in a U-shape in cross section at a position corresponding to the four protrusions 27 when the upper horizontal chock 18 is placed, and the prestress rod 17 can be inserted from the horizontal direction. It is like that. A positioning member 35 is also mounted on the opening 34. In addition, the code | symbol 36 in FIG. 1 (B) represents the attachment seat fixed by the stand clamp on the soleplate 36a fixed to the floor surface.
[0012]
Since the lower roll chock assembly 16 has an eccentric reduction mechanism 37 and basically has the same structure as the upper roll chock assembly 12, only a reference numeral is attached and a detailed description is omitted. Reference numeral 38 denotes an electric motor, reference numeral 39 denotes a worm reduction gear, reference numeral 39a denotes an output shaft of the worm reduction gear 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 protrusion, reference numeral 44 Is a U-shaped opening in cross section, and reference numeral 45 represents a positioning member. Reference numeral 46 represents a positioning member provided at the lower end of the protrusion 43.
[0013]
At the upper end of the prestress rod 17, a double rod type hydraulic cylinder portion 47 is formed in which a part of the prestress rod 17 is a rod. As shown in FIG. 2, the hydraulic cylinder portion 47 includes a cylinder 49 to which the piston 48 of the prestress rod 17 is attached and 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 seal material 51. The prestress rod 17 slides on the rod side and is sealed by a seal material (not shown). A cylinder cover 53 in which a through hole 52 is formed is attached. A hydraulic pressure 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 pressure supply port.
As shown in FIG. 2, a male screw portion 56 into which a mounting nut 55 on which a positioning member 54 corresponding to the positioning member 46 is set on the back surface is screwed is formed at the lower end portion of the prestress rod 17. Further, a male screw portion 58 into which a mounting nut 57 set on the back surface of the cylinder cover 53 is screwed is formed from an intermediate position to a tip portion of the hydraulic cylinder portion 47 of the prestress rod 17.
[0014]
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 cylinder 47 When the pressure oil is supplied to the head side, 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 into the cylinder cover. Set on the back of 53. In this state, a tensile force acts on the prestress 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 are firmly fastened by the action of this tensile force. Thus, it can withstand the rolling resistance during rolling. In FIG. 2, reference numeral 62 denotes a wheel provided via a bearing (not shown) below the lower roll chock assembly 16, reference numeral 59 denotes a positioning member corresponding to the positioning member 29, and reference numeral 60 corresponds to the positioning member 35. The positioning member 61 is a positioning member corresponding to the positioning member 45. The positioning member 59 and the positioning member 29, the positioning member 60 and the positioning member 35, the positioning member 61 and the positioning member 45, and the positioning member 46 and the positioning member 54 each have an automatic alignment structure.
[0015]
Next, the replacement work of the roll chock to which the combination mill 10 according to the embodiment of the present invention is applied will be described with reference to the drawings. Note that the state shown in FIG. 2 is assumed before the replacement.
First, pressure oil is supplied to the head side of the hydraulic cylinder portion 47 of the four prestress 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 The contact state is released, and in this state, the mounting nut 57 is rotated and loosened to be removed from the upper end of the prestress rod 17, and the supply of pressure oil is stopped.
[0016]
Next, the four pre-stress rods 17 are moved to the outside of the combination mill 10 to be removed 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 to be replaced. Remove, stack and position, including new ones that replace the removed ones.
Thereafter, the four prestress rods 17 are inserted into the openings 28, 34, 44 from the outside of the combination mill 10, and pressure oil is supplied to the head side of the hydraulic cylinder 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 pressure oil is stopped and the replacement operation is completed.
In the state where the replacement work is completed, the tensile force by the hydraulic cylinder 47 does not act on the prestress rod 17, and between the mounting nut 57 at the upper end of the prestress rod 17 and the mounting nut 55 at the lower end. A tensile force is acting.
[0017]
Therefore, when replacing a roll chock assembly or the like, it is not necessary to lift the required roll chock assembly along the prestress rod using a lifting machine or the like as in the prior art. Can be done safely.
Moreover, 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 prior art but a double rod type, it is not necessary to always apply oil pressure during the rolling operation. In addition, problems such as misroll and machine damage can be reliably prevented.
[0018]
In the above-described embodiment, the hydraulic cylinder portion 47 is formed at the upper end portion of the prestress rod 17. However, the hydraulic cylinder portion 47 may be formed at the lower end portion of the prestress rod as necessary.
[0019]
【The invention's effect】
In the combination mill according to claim 1 and 2 , the upper roll chock assembly, the intermediate housing and the lower roll chock assembly are provided with openings through which a plurality of prestress rods can be inserted in the horizontal direction. It can be carried out easily, in a short time and safely.
In particular, since a double rod type hydraulic cylinder part with a part of the prestress rod as a rod is formed at the upper end or lower end of the prestress rod, it is necessary to always apply oil pressure during the rolling operation. Therefore, it is possible to reliably prevent problems such as misroll and machine breakage caused by a hydraulic pressure drop problem.
In the combination mill according to the second aspect , since the lower roll chock assembly is provided with wheels, the off-line transfer work 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, respectively.
FIG. 2 is a partially cutaway front view of the combination mill.
[Explanation of symbols]
10: Combination mill, 11: Upper horizontal roll, 12: Upper roll chock assembly, 13: Straw 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 speed 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: Wrap roll reduction mechanism, 31: Electric motor, 32: Worm shaft, 33: Rotary pressure lower shaft, 34: Opening, 35: Positioning member, 36: Mounting seat 36a: sole plate, 37: eccentric reduction mechanism, 38: electric motor, 39: war Reduction gear, 39a: output shaft, 40: worm shaft, 41: worm gear, 42: worm wheel gear, 43: protrusion, 44: opening, 45: positioning member, 46: positioning member, 47: hydraulic cylinder portion, 48 : Piston, 49: Cylinder, 50: Through hole, 51: Sealing material, 52: Through hole, 53: Cylinder cover, 54: Positioning member, 55: Mounting nut, 56: Male thread part, 57: Mounting nut, 58: Male thread Part, 59: positioning member, 60: positioning member, 61: positioning member, 62: wheel

Claims (2)

In a combination mill in which an upper roll chock assembly having an upper horizontal roll, an intermediate housing having a pair of eaves rolls, and a lower roll chock assembly having a lower horizontal roll are stacked and fastened by a plurality of prestress rods,
The upper roll chock assembly, the intermediate housing and the lower roll chock assembly are each provided with an opening through which the prestress rod can be inserted in a horizontal direction,
Formed on the upper end or lower end of the pre-stress rod is a double-rod type hydraulic cylinder having a part of the pre-stress rod as a rod, and the rod on the tip side of the hydraulic cylinder A combination mill characterized in that a male screw part is formed, into which a mounting nut set on the back surface of a cylinder cover of a hydraulic cylinder part is screwed . Combination mill of claim 1 and a wheel on the lower roll chock assembly.

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