JP2002192217A - Adjustment device between axles of guide rollers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate unstable adjustment work between guide roller axles due to increasing friction resistance caused by accumulated rust and scale on a sliding surface between a roller holder and a guide box. SOLUTION: A pair of left and right roller holders is fitted rotatably to pivot pins erected on the guide boxes. At the rear ends of both roller holders facing each other, joint cases with sockets are attached. A pair of adjustment screw members is connected to the joint cases, with ball-shaped parts on the top ends inserted into the sockets, where shafts stretched from the ball-shaped parts have a left-handed or a right-handed screw on each outer circumferential surface of the shaft. A pair of nut members, having female screws matching to each left-handed or right-handed screw on the pair of adjustment screw members, is fixed to the guide boxes. When the pair of adjustment screws is rotated simultaneously in the same direction, the pair of roller holders moves open or close.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the center of a guide roller in a bar and bar mill guide for guiding a bar or wire rod into a roll hole type of a rolling mill.

[0002]

2. Description of the Related Art As a conventional guide device, for example, there is one described in Japanese Patent Publication No. 60-23890. As shown in FIG. 1, such a guide device has a pair of roller holders 2 each having a pair of guide rollers 4 mounted on the distal ends thereof, which are supported on both sides of the guide box 1 via fulcrum pins 5. Are arranged symmetrically with
The twin cylinder 23 is located at the rear center of the guide box 1.
And a coil spring 21 is disposed between the rearmost ends of both roller holders 2, and has a configuration in which the pair of roller holders 2 are urged in such a direction as to always open. ing.

At the rear of each roller holder 2, a pressure screw 19 screwed in a direction perpendicular to the pass line P is provided, and the tip of the pressure screw 19 is connected to each piston rod 24 of the twin cylinder 23.
The pair of guide rollers 4 is arranged so as to abut against the end surfaces of the pair of guide rollers 4, that is, rotating the pair of roller holders 2 about the fulcrum pin 5 by a predetermined angle is a twin cylinder 23. By simultaneously moving the piston rods 240 and 250 symmetrically in the opposite direction perpendicular to the pass line P.

[0004] For example, when the piston rods 240 and 250 of the twin cylinder 23 are moved away from the pass line P, the pair of roller holders 2 move closer to each other around the fulcrum pins 5 at the same time. And the guide roller 4 at the tip thereof is narrowed to reduce the distance between the cores, while the piston rods 240, 2
When the guide rollers 4 are moved toward each other in a direction approaching the pass line P, the roller holders 2 are simultaneously rotated around the fulcrum pins 5 by the restoring force of the coil spring 21 so as to move away from each other. When opened, the distance between the cores is enlarged.

That is, the operation of the guide rollers 4 mounted on the tip ends of the pair of roller holders 2 to approach each other is performed by extending the piston rods 240 and 250 of the twin cylinder 23 in contact with the roller holders 2. The operation of the guide rollers 4 to move away from each other is performed substantially by the restoring force of the coil spring 21 while contracting the piston rods 240 and 250 of the twin cylinder 23.

[0006]

In such a conventional guide roller center adjustment mechanism, a sliding mechanism is provided between a pair of roller holders 2 and a guide box 1 which can simultaneously rotate in opposite directions about a fulcrum pin 5. If rust adheres to the moving surface or the scale accumulates, there is a problem that the frictional resistance between the roller holder 2 and the guide box 1 increases, and the operation of adjusting the center becomes unstable.

That is, each piston rod 240, 25
There is no major problem when performing an operation in which the center distance is reduced by extending 0 in opposite directions, but when the piston rods 240 and 250 are contracted in opposite directions to increase the center distance. In addition, since the movement of the roller holder 2 is substantially performed by the restoring force of the coil spring 21, the rotation of the roller holder 2 is directly affected by the increased frictional resistance. Become. In particular, as the size of the guide roller 4 increases and the length of time during which the guide roller 4 is installed in the rolling mill, the restoring characteristics of the coil spring 21 decrease, and the operation of adjusting the center of the guide roller 4 becomes unstable. was there.

In the prior art, the force points P1 and P2, which are the contact portions between the piston rods 240 and 250 and the pressure screw 19, are such that the piston rod has a flat end face and the pressure screw has a spherical end face. Therefore, the contact area is very small, and all the loads are applied to the power points P1 and P2 having the very small contact area. Therefore, there has been a problem that the contact surface is deformed with the passage of time, and the center of the guide roller 4 is deviated.

Further, since the pressure screw 19 has a structure in which the pressure screw 19 is directly screwed into the roller holder 2, the internal thread of the roller holder 2 is deteriorated and the roller holder itself becomes unusable. there were.

[0010] The present invention has been made to solve the above problems of the prior art, and has been made.
An object of the present invention is to propose a roller center adjusting device of a mill guide for a bar steel, which enables a stable center adjusting operation.

[0011]

Means for Solving the Problems As a result of diligent research to achieve the above-mentioned object, the inventor has conceived of an invention having the following contents as the main components. That is, the present invention is fixed to the guide box, and an entry guide for guiding the feeding of the rolled material in the rolling direction, and disposed rotatably around a fulcrum pin erected on the guide box,
A pair of roller holders having at least one guide roller at the front end facing the exit side of the entry guide, and the guides are rotated synchronously in opposite directions around the fulcrum pin. A strip guide mill having a mechanism for adjusting a center distance between rollers, a joint case having a curved socket attached to a position facing a rear end of each of the pair of roller holders, and the joint case. A pair of adjusting screw members each having a spherical portion at the distal end for engaging with the socket, and having a shaft portion extending from the spherical portion, and a right-handed screw or a left-handed screw formed on the outer peripheral surface of the shaft portion. And having a female screw to be screwed into the right or left screw of the pair of adjusting screw members, respectively. A pair of nut members respectively fixed to the id box, as core between adjusting device of the guide rollers, characterized in that it is composed of the pair of adjusting screw members from the means for rotating synchronously in the same direction.

According to such a configuration, right and left screws having a reverse screw relationship to each other are formed on the shaft portions of the pair of adjusting screw members, respectively, and the right and left screws are formed by the pair of fixing nuts. Since the pair of adjustment screw members are screwed into the respective internal threads of the members, they are advanced and retracted in opposite directions by synchronously rotating the pair of adjustment screw members. On the other hand, the spherical portions formed at the tips of these adjusting screw members are engaged with the curved sockets of the joint case. It moves while maintaining the surface contact state with the socket, that is, each roller holder receives rotational moments in opposite directions about the fulcrum pin, and about the fulcrum pin according to the advance / retreat distance of the adjusting screw member. A circular motion (opening / closing motion) can be performed.

Therefore, the pair of roller holders can be opened and closed while always maintaining the mechanical contact state with the adjusting screw member, so that there is no need for the intervention of a coil spring as in the prior art. Therefore, even if rust adheres to the sliding surface between the roller holder and the guide box or scale accumulates, and the frictional resistance between the roller holder and the guide box increases, the center distance between the roller guides can be adjusted. Can be stably performed.

In particular, the spherical portion formed at the tip of the adjusting screw member engages with the curved socket of the joint case, which makes surface contact between the curved surfaces, so that the contact area is greatly increased as compared with the prior art. Can be increased to
In addition, the adjusting screw member moves forward and backward while rotating on a straight line, while the roller holder and the joint case also rotate about the fulcrum pin, so that the contact point between the spherical portion and the socket changes, and as a result, The deformation of the contact surface can be suppressed as much as possible.

Furthermore, since the joint case having the socket can be bolted to the roller holder with a very large contact surface, the service life of the roller holder is greatly increased, and each component thereof can be easily replaced. Since it is possible, even if a component such as a socket is worn out, the component can be easily replaced, so that a good condition can be restored.

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, which is an example applied to a steel strip mill guide device, and FIG. 2 is a side view thereof.

In the drawing, R indicates rolling rolls arranged in pairs up and down in a steel strip mill guide device, and G indicates feeding of a rolled material to the rolling roll R (in the figure, an arrow X).
Roller guide device 10 for guiding the direction
2 shows a guide box that forms part of.

In such a roller guide device 10, an entry guide 12 for guiding the feeding of the rolled material in the rolling direction is fixed to the guide box G, and outside the entry guide 12, from the entrance side to the exit side. A pair of left and right arm-shaped roller holders 14 extending along is provided, and at least one guide roller 16 is mounted near the front end thereof.

The pair of roller holders 14 are rotatably disposed about a fulcrum pin 20 erected on the guide box G, and a guide roller 16 disposed near the front end thereof is a roller holder. In a state in which the rolled material is held at an appropriate position, the rolled material can be hugged from both left and right sides at a position facing the exit side of the entry guide 12.

In the roller guide device 10 configured as described above, the pair of roller holders 14 are rotated synchronously in opposite directions about the fulcrum pin 20,
A mechanism is provided to allow them to open and close, thereby adjusting the center distance between the guide rollers 16.

The opening and closing of the pair of roller holders 14 is performed by mechanically connecting the pair of adjusting screw members 22 and the pair of roller holders 14 via ball bearings, respectively.
This is performed by a mechanism that converts the synchronized linear motion of each adjusting screw member 22 into a rotational motion about the fulcrum pin 20 of each roller holder 14. The details will be described below.

The pair of adjusting screw members 22 are arranged in a row on a straight line L extending in a direction perpendicular to the rolling direction, and each adjusting screw member 22 has a shaft portion 24 extending along the straight line L and a shaft portion thereof. And a spherical portion 26 formed at one end of the portion 24. Each of the spherical portions 26 is engaged with a joint case 42 provided at the rear end of each roller holder 14 as described later. It is connected to the holder 14.

Each shaft 24 of the pair of adjusting screw members 22
, A male screw 28 having a reverse screw relationship to each other, that is, a right screw 28a is formed on one adjustment screw member, and a left screw 28b is formed on the other adjustment screw member. A pair of nut members 30 each having a female screw 30a or 30b screwed to each male screw 28 having the right screw 28a or left screw 28b and rotatably supporting those adjusting screw members 22 is provided. It is fixed on the guide box G.

The pair of nut members 30 are each vertically divided into two parts on the axis, that is, upper and lower element members having internal threads 30a or 30b formed on the inner surface, and as shown in FIG. On one side of the shaft, it is fixed to the guide box G in a state of being tightened by two relatively small hexagonal bolts 50, and on the other side of the shaft, one relatively large The hexagonal bolt 52 is formed so that a gap is formed in the mating surface, that is, an interference is formed. In this embodiment, it is machined so that an interference of several millimeters is formed on the mating surfaces of the upper and lower element members.

Accordingly, in a state where the upper and lower element members are put together with the shaft interposed therebetween, the female screw 30a or 30b is formed on the central inner surface with the right screw 28a or the left screw 2 constituting the male screw 28.
8b, the upper and lower element members are tightly tightened by small hexagonal bolts 50 on one side, and to the extent that a gap is formed between the upper and lower element members by large hexagonal bolts 52 on the other side. It is configured as follows. It is preferable that the relatively large hexagonal bolt 52 be tightened again after the adjustment of the center distance of the guide roller so that the respective adjustment screw members 22 do not rotate due to vibration or the like during the rolling operation. Such a nut member 30
Are bolted, so that they can be easily replaced.

An elongated hole 34 having a regular hexagonal cross section is formed in the shaft portion 24 of each adjusting screw member 22 supported by the nut member 30 along the axial direction, and the cross section is formed in these holes. Both ends of a single regular hexagonal shaft 36 are inserted. A ratchet 40 having an opening having a regular hexagonal cross section is arranged on the outer periphery of the central portion of the shaft 36 in a state where the opening is fitted to the outer periphery of the shaft 36.
A tubular sleeve 38 is disposed between the end of the nut member 30 and the end of the ratchet 40 so that the tubular sleeve 38 is disposed at the center between them. And the sleeve 38
A ring-shaped sleeve collar 39 is separately provided between the nut member 30 and the end of the nut member 30. Further, the shaft 36 and the sleeve 38 are fixed by a spring pin (not shown) so that the shaft 36 cannot move in the axial direction.

The rotation of the ratchet 40 by manual operation causes the shaft 36 and the sleeve 38 to rotate integrally, whereby the pair of adjustment screw members 22 advance and retreat on the straight line L while simultaneously rotating in the same direction. Exercise is performed.

On the other hand, a joint case 42 is attached to the rear end of each roller holder 14 so as to correspond to the pair of adjusting screw members 22.
Is provided with a socket 44 having a curved surface having substantially the same curvature as the spherical portion 26 of the adjusting screw member 22 on the inside. The inner surface of the socket 44 rotates and moves in a state where the spherical portion 26 maintains mechanical contact with the inner curved surface of the socket 44 as the adjusting screw member 22 advances and retreats, and each roller holder 14 moves the fulcrum pin 20. It is formed in a curved shape so that it can rotate around the center.

Specifically, the joint case 42 has a three-part structure, and the first component thereof is arranged so that the hemispherical portion including the tip of the spherical portion 26 of the adjusting screw member 22 is engaged with the joint case. The roller holder 14 is bolted to the rear end of the roller holder 14 with a curved surface having substantially the same curvature inside, and the second and third components have a hemispherical portion near the shaft of the spherical portion 26 of the adjusting screw member 22. The first component is bolted to the first component with a similar inner surface that is continuous with the inner surface of the first component for engagement, and the inner surface is a spherical portion of the adjustment screw member 22. A socket 44 that engages with the socket 26 is formed.

Therefore, the engagement between the spherical portion 26 of the adjusting screw member 22 and the socket 44 of the joint case 42 is a contact between the curved surfaces, so that the contact area can be increased as compared with the above-mentioned prior art. Further, the adjusting screw member 22 advances and retreats while rotating on the straight line L, while the roller holder 14 and the joint case 42 also rotate about the fulcrum pin 20, so that the contact point between the spherical portion 26 and the socket 44 changes. As a result, deformation of the contact surface due to wear or the like can be suppressed as much as possible.

The guide roller 16 constructed as described above
In the mechanism for adjusting the center-to-center distance, the shaft 36 that gives synchronous rotation to the pair of adjustment screw members 22 is, itself,
Although only rotating about the axis, the clockwise or counterclockwise rotation of the shaft 36 causes the pair of adjusting screw members 22 to be screwed in opposite directions while rotating with the shaft 36. That is, the linear motions that separate from each other or the linear motions that approach each other are performed on the straight line L.

When the adjusting screw members 22 perform a linear motion such that they are separated from each other, the spherical portion 2
6 is pressed outwardly, but the spherical portion 26 is formed to rotate and move along the inner surface of the socket 44 while maintaining mechanical contact therewith. The pair of roller holders 14 receive rotational moments in directions opposite to each other, and rotate around the fulcrum pins 20 at the same time to approach each other. Is performed.

Similarly, when the adjusting screw members 22 perform linear movements approaching each other, the pair of roller holders 14 rotate around the fulcrum pins 20 simultaneously and away from each other, and 16 is opened to perform an operation of expanding the center-to-center distance.

In this embodiment, as means for synchronously rotating the pair of adjusting screw members 22 in the same direction,
Although a shaft 36 having a regular hexagonal cross section is inserted through each adjusting screw member, the shafts 36 are fixed and connected by a sleeve 38 having a regular hexagonal cross section, and the sleeve 38 is manually rotated by a ratchet 40. ,
It is not limited to such a configuration. For example,
Instead of using the ratchet 40, the central portion of the shaft 36 may be formed in a hexagonal cross section, and a spanner may be hung there to be manually rotated.

[0035]

As described above, according to the guide roller center adjusting mechanism of the present invention, the pair of roller holders can be opened and closed while always maintaining mechanical contact with the adjusting screw member. The structure eliminates the need for coil springs as in the prior art, so rust may adhere to the sliding surface between the guide box and the roller holder, or scale may accumulate. Even if the frictional resistance between the box and the box increases, the effect of stably adjusting the center of the roller guide can be obtained.

In particular, the engagement between the spherical portion of the adjusting screw member and the socket of the joint case is a mechanical contact between the curved surfaces, and the contact points change, so that the contact area is greatly increased as compared with the prior art. And the deformation of the contact surface can be suppressed as much as possible.

Furthermore, since the joint case can be bolted to the roller holder with a very large contact surface, the service life of the roller holder is greatly increased, and each part such as a socket can be easily replaced. Therefore, even if components such as the socket are worn out, the components can be easily replaced and restored to a good state.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view showing an embodiment of the present invention, and shows an application to a strip guide mill guide device.

FIG. 2 is a side view of the guide device.

FIG. 3 is a diagram for explaining opening and closing of a pair of roller holders, and shows a state where the roller holders are opened.

FIG. 4 is also a view for explaining opening and closing of a pair of roller holders, and shows a state in which the roller holders are closed.

FIG. 5 is a sectional view showing a mechanism for synchronously driving a pair of adjustment screw members.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Guide apparatus 12 Entry guide 14 Roller holder 16 Guide roller 20 Support pin 22 Adjusting screw member 24 Shaft part 26 Spherical part 28a, 28b Male screw 30 Nut member 30a, 30b Female screw 34 Shaft hole 36 Shaft 38 Sleeve 39 Sleeve collar 40 Ratchet 42 Joint Case 44 Socket 50 Hex bolt (for fixing nut member) 52 Hex bolt (for fixing screw member) G Guide box

Claims (1)

[Claims] 1. An entry guide fixed to a guide box for guiding a rolled material in a rolling direction,
A pair of roller holders that are disposed rotatably about a fulcrum pin erected on the guide box and that have at least one guide roller at a front end facing the exit side of the entry guide. And a device for adjusting the center distance of the guide roller by rotating the roller holder in the opposite direction synchronously with the fulcrum pin as a center, after each of the pair of roller holders. A joint case having a curved socket attached to a position facing the end, and having a spherical portion at the tip for engaging with the socket of the joint case, and having a shaft portion extending from the spherical portion, A pair of adjusting screw members each having a right-handed screw or a left-handed screw formed on the outer peripheral surface of the shaft portion; A pair of nut members each having a female screw to be screwed to the right or left screw of the screw member, respectively, and a means for synchronously rotating the pair of adjustment screw members in the same direction; , A guide roller center-to-center adjusting device.