JPH0646569Y2 - Rolling mill entrance guide - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is installed on the inlet side of a hot rolling mill for products such as wire rods and steel bars, and is used for guiding the rolled material to a predetermined rolling line. Regarding the guide.

[Conventional technology]

A rolling mill inlet guide is provided to guide the rolled material to the rolling rolls of the hot rolling mill for wire rods and bar products such as bar steel.

The role of the inlet guide is mainly to guide the rolled material to the center of the roll die and to hold the rolled material so that it does not twist due to rolling.

In the prior art, the inlet guide roller is arranged such that its axis lies in two planes orthogonal to the rolling roll axis,
The distance between the rollers is set slightly smaller depending on the outer dimensions of the rolled material. When the rolled material passes between the rollers, the distance between the rollers is widened by the rolled material,
The roller holds the rolled material by its reaction force.

Therefore, as a drawback, unless the mutual distance between the rollers is adjusted according to the size of the rolled material, the holding force becomes insufficient, or the rolled material cannot pass, which causes a trouble. Therefore, it is necessary to frequently adjust the mutual distance between the rollers. In addition, the width of the entire device is wide, and the roll body length is not effectively used. The above conventional technique will be described with reference to the drawings.

FIG. 2 is a plan view schematically showing an arrangement of guide rollers 1a and 1b for guiding the rolled material 12 to the rolling roll 10. The guide rollers 1a and 1b guide the rolled material 12 to the center of the die 13 of the rolling roll 10. FIG. 3 shows a cross section of the rolled material 12 showing the rolled material 12 in the die 13 of the rolling rolls 10a and 10b.
FIG. 3 (a) shows a state where the rolled material 12 is not twisted and is normally in the hole die 13, and FIG. 3 (b) is a state where the rolled material 12 is twisted in the direction of the arrow 15 and is in the hole die 13. Is shown. If the rolled material is twisted as shown in FIG. 3 (b), normal rolling cannot be performed. Therefore, the rolling mill inlet guide must be held so that the rolled material 12 is not twisted.

FIG. 4 (a) is a plan view of the guide rollers 1a and 1b, and FIG. 4 (b) is a front view thereof. The axes of the guide rollers 1a and 1b are perpendicular to the roll shaft 11 of the rolling roll (a plane orthogonal to each other). The width 14 in the direction of the rolling roll axis 11 occupied by the guide rollers 1a and 1b is large. Therefore, it is shown that the adjacent hole type 13b cannot be used.

Next, with the conventional guide rollers, the guide function increases as the rolled material is clamped more strongly, but in order to firmly clamp the rolled material, the mutual distance between the rollers needs to be slightly smaller than the outer dimension of the rolled material, and the rolled material is narrow. As it enters between the rollers, it collides with the rollers. Therefore, there is proposed a technique in which the gap between the rollers is wide when the rolled material enters, and the gap between the rollers is narrowed at the moment when the rolled material enters the roller to guide the rolled material. (Japanese Patent Laid-Open No. 61-266114) Such a technique requires a complicated hydraulic mechanism, a detection device, and a sequence control device, the device becomes expensive, and the space occupied by the device also becomes large in the roll axis direction. .

In addition, a roller pressing force is required as a holding force for preventing the rolled material from twisting.

[Problems to be solved by the device]

 The present invention eliminates the work of adjusting the mutual distance between the guide rollers in the inlet guide of the hot rolling mill for rolled steel products.

Reduce the occupied dimension of the guide roller in the width direction to enable multi-row guide of rolled material.

A structure that can prevent the rolled material from twisting even if the pressing force in the direction of narrowing the gap between the rolls is small.

Is to achieve. If the pressing force in the direction of narrowing the gap between the rolls is small, the rolled material can pass through the gap between the rollers without hindering the progress thereof.

[Means for Solving the Problems]

The present invention has the following features in the rolling mill inlet guide for guiding the rolled material to the hot rolling mill for rolled steel products.

(A) A plurality of pairs of non-driving rotation guide rollers each having a roller shaft parallel to the roll axis of the rolling mill are arranged.

(B) The guide rollers of each pair are attached to the swing ends of the roller holders of each pair that swing in a direction in which the mutual spacing is increased or decreased.

(C) The roller holder includes a spring that urges the pair of rollers in a direction that reduces the distance between the rollers, and a biasing force adjusting device for the spring.

[Action]

The guide roller is configured by arranging a plurality of pairs of guide rollers each having a roller shaft parallel to the rolling shaft of the rolling mill. Each pair of guide rollers is rotatably held by each pair of roller holders. Therefore, by using a rolling roll provided with a plurality of holes, a plurality of wire rods and the like can be processed at the same time. The interval between the guide rollers is roughly set to a size smaller than the size of the rolled material by the spring and the adjusting screw. The rolled material is held by the reaction force from the rollers while widening the distance between the rollers and guided to the rolling mill.

According to the present invention, the twist of the rolled material by the rolling mill is received by the side flange of the guide roller. Therefore, the force against the twist mainly acts in the roller axial direction, and the force exerted in the direction in which the distance between the two rollers increases is small. Therefore, the reaction force against the twist of the rolled material can be extremely small. For the above reasons, the structure for keeping the mutual distance between the rollers may be provided with a simple biasing mechanism such as a coil spring structure. Further, it is possible to obtain a wide range of bending allowance, and it is not necessary to change the distance between the rollers even if the size of the rolled material changes. It is also effective to maintain a low pressure by hydraulic pressure or air pressure instead of the coil spring.

〔Example〕

FIG. 1 shows a rolling mill inlet guide according to an embodiment of the present invention,
It is a (a) top view, a (b) partial section side view, and a (c) elevation view (C-C arrow sectional view of a figure).

The pair of rollers 1a, 1b is a roller shaft 2a parallel to the roll shaft 11,
It has 2b and is rotatably supported by bearings 3a and 3b. These bearings 3a and 3b are attached to one end of the roller holders 4a and 4b, respectively. Roller holders 4a and 4b have 1
A fulcrum pin distant from the rollers 1a, 1b so that the pair of rollers 1a, 1b oscillate in a direction of expanding or contracting the mutual mutual distance.
Therefore, it is swingably supported by 5a and 5b. That is, the rollers 1a and 1b are attached to the swing ends of the roller holders 4a and 4b. No driving power is used for the pair of rollers 1a and 1b and the roller holders 4a and 4b.

The roller holders 4a, 4b are provided with springs 6a, 6b for urging the roller holders in a direction in which the mutual distance between the rollers 1a, 1b is reduced when the rolled material advances between the rollers 1a, 1b. The springs 6a and 6b are for holding the rolled material. The springs 6a, 6b are provided with spring adjusting screws 7a, 7b for adjusting the urging force. These are attached to the guide box 8. Further, an entry guide 9 for guiding the rolled material between the rollers 1a and 1b is provided.

In the rolling mill entrance guide of the embodiment, it is not necessary to adjust the inter-roller interval each time when rolling materials having different sizes are sequentially guided. Further, it has a great function of preventing the rolled material from being twisted. Further, the dimension in the roller width direction can be reduced.

The rolled material 12 guided to the hole die 13 of the rolling mill rolls 10a and 10b is
It is introduced from the entry guide 9, and the rollers 1a and 1b are slightly pushed apart and introduced into the hole die 13. Since the twist of the rolled material is received by the side flanges of the rollers 1a and 1b, the twist of the rolled material hardly occurs.

[Effect of device]

By using a rolling roll provided with a plurality of cavities by using the rolling mill inlet guide of the present invention, it is possible to guide a plurality of wire rods having a wide range of dimensions at the same roller interval to each cavities at the same time. You can

Eliminates the trouble caused by setting the mutual roller gap.

Since the width of the device in the roll axial direction is small, the rolling roll can form a hole shape up to the end of the cylinder length. Moreover, since the device width is small, it is effective for a compact multi-row guide.

Since the force of the roller holding the rolled material is small, the surface pressure of the roller is small, the wear of the roller is small, and the life is long.

Since the rolled material is twisted by the roller thrust force, it can be held firmly and stably.

[Brief description of drawings]

FIG. 1 is a three-view drawing of a rolling mill entrance guide according to an embodiment of the present invention,
2 and 3 are explanatory views of the role of the rolling mill inlet guide, and FIG. 4 is a schematic view of a conventional rolling mill inlet guide. 1a, 1b ... Guide rollers 2a, 2b ... Roller shafts 3a, 3b ... Bearings 4a, 4b ... Roller holders 5a, 5b ... Support pins 6a, 6b ... Spring 7a, 7b ... Spring adjusting screw 8 ... Guide box 9 ... Entry guide 10 … Roll 11… Roll axis 12… Rolled material 13… Hole type 14… Equipment width

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takaya Suzuki, 2-2, Kita Sanjo East, Chuo-ku, Sapporo-shi, Hokkaido 30 Kotobuki Sangyo Co., Ltd. Stock Company Okayama Sales Office (56) References Actual Development Sho 61-58911 (JP, U) Actual Development Hei 1-109309 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A rolling mill inlet guide for guiding a rolled material to a hot rolling mill for rolled steel products, wherein a plurality of pairs of non-driving rotary guide rollers each having a roller shaft parallel to the rolling mill roll shaft are provided in a row. The guide rollers of each pair are attached to the swinging ends of the roller holders of each pair that swing the mutual spacing in the direction of expansion and contraction, and the roller holders urge the roller rollers of each pair in the direction of reducing the roller spacing. A rolling mill inlet guide comprising a spring and a biasing force adjusting device for the spring.