JPH0747124Y2 - Rolling down device for 3-roll rolling mill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reduction device for a three-roll rolling mill.

2. Description of the Related Art Conventionally, in a three-roll rolling mill, as shown in FIG. 3, three rolling rolls 51 are radially arranged at 120 ° intervals in a vertical plane and are respectively rotated to roll a rolling material A into three rolls. It is configured to be rolled to obtain a wire rod, for example.

Further, this three-roll rolling mill is provided with a rolling-down device 52 that adjusts the rolling dimension by moving each roll 51 close to and away from the center of the rolled material.

By the way, the rolling-down device 52 includes three cylindrical support frames 55 that rotatably support the roll holders 53 that hold the rolls 51 via bearings 54 at eccentric positions, and the cylindrical support frames 55. And a rotary drive device 56 for rotating the motor by a predetermined angle.

Further, in order to maintain the quality of the rolled product in good condition by making the rolling amount, that is, the moving amount of the three rolls 51 the same, all the rotation amounts of the respective cylindrical support frames 55 are made the same.
That is, the three cylindrical support frames 55 are interlocked and coupled so that the phases of the rotation angles match.

That is, helical gears 61A, 61B, 62, 63 are provided at both ends of the first tubular support frame 55A and one ends of the second and third tubular support frames 55B, 55C, respectively, and further the third tubular Worm wheel teeth 64 are formed at one end of the circular support frame 55C, and a worm shaft 65 on the rotary drive device 56 side is meshed with the worm wheel teeth 64.

Therefore, when the worm shaft 65 is rotated, the third tubular support frame 55C, the first tubular support frame 55A, and the second tubular support frame 55B are simultaneously rotated, and the rolls 51 are pressed by the same amount. Of course, the roll 51 is pressed down because the roll holder 53 that holds the roll 51 is rotatably supported at each eccentric position with respect to each of the cylindrical support frames 55.

The drive system of each roll 51 will be described. When the first roll holder 53A is rotated via the input side gear 71 and the drive cylinder 72, the second roll holder 53B causes the drive cylinder 72 and the drive cylinder 72 to rotate. It is rotated via a pair of helical gears 73 and 74 formed on the second roll holder 53B, and
The roll holder 53C is rotated by meshing the helical gear 75 engaged with the first roll holder 53A and the helical gear 76 engaged with the end of the third roll holder 53C. .

However, according to the above-mentioned conventional configuration, the roll size is reduced during the rolling operation due to the introduction of the automatic dimension control system (AGC).
Inconvenience arises when the reduction amount of 1 has to be adjusted.

That is, when rolling the rolls 51 during the rolling operation, it is necessary to overcome the rolling force to move the rolls 51, and therefore the rotational drive of the tubular support frame 55 when adjusting the rolling amount of each roll 51. The power is significantly increased.

For this reason, the bevel gears 61A, 61B, 62, 63 must be made large in size by interlocking the tubular support frames 55 with each other, but the three tubular support frames 55 correspond to the sides of the equilateral triangle. Since it is placed in a position, the length of each side is inevitably determined by, for example, the size of the roll 51, so that there is a problem that only the bevel gear cannot be made large.

Then, this invention aims at providing the rolling-down apparatus in the 3-roll rolling mill which can solve the said subject.

Means for Solving the Problems In order to solve the above problems, the reduction device in a three-roll rolling mill of the present invention is a reduction device for a three-roll rolling mill in which three rolling rolls are radially arranged at 120 ° intervals. There are worm wheel teeth formed on the outer periphery of each support frame that rotatably supports the roll holder that holds each rolling roll at an eccentric position, and a worm that meshes with the teeth of each support frame. A shaft is provided, a gear is provided at the end of each of these worm shafts, and a rotary drive device that rotates the worm shaft via this gear is provided, and a detector that detects the rotational position of each of the support frames is provided, Each rotation drive device is controlled based on the detection signal from this detector.

Action According to the above configuration, since the rotation driving device that individually rotates the support frame that adjusts the reduction amount of each rolling roll, a bevel gear for interlocking connection is provided at the end of the support frame as in the conventional case. There is no need, and therefore the drive transmission torque required for reduction can be increased.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 2, reference numeral 1 denotes three rolling rolls radially arranged at an angle of 120 degrees in the vertical plane.
Are respectively held by the roll holders 2, and these roll holders 2 are rotatably supported by the cylindrical support frame 4 via bearings 3 at eccentric positions.

Each rolling roll 1 is configured to be rotationally driven in an interlocking manner by an input side gear 6 via an internal gear 2a and a bevel gear 5 formed on a roll holder 2.

On the other hand, the rotational drive of the tubular support frame 4 for adjusting the reduction amount of each rolling roll 1 is performed independently.

That is, each tubular support frame 4 is provided with a tooth portion 7 of the worm wheel (which may be a part of the worm wheel tooth) 7 and, as shown in FIG. Worm shafts 9 meshing with the tooth portions 7 are provided via bearings 10, and a driven gear 11 is attached to one end of each worm shaft 9, and a driven gear 11 is installed in the mill housing 8. A hydraulic motor (an example of a rotary drive device, which may be an electric motor in addition to this) 13 in which a drive side gear 12 meshing with is attached to an output shaft portion 13a thereof is arranged.

Further, the driven gear 11 is provided with a detector 14 for detecting the rotation amount (or rotational position) of the worm shaft 9, and the detector 14 is a detection gear that meshes with the driven gear 11.
15 and a rotary encoder 16 rotated by this detection gear 15.

The detection signals from the detectors 14 corresponding to the worm shafts 9 are input to a control device (not shown), and the hydraulic motors are output based on the input detection signals.
13 are controlled.

That is, the hydraulic motor 13 is controlled so that the rotation amounts of all the tubular support frames 4 are the same, and the rolling amounts of the rolling rolls 1 are equalized.

Therefore, in the above structure, when each hydraulic motor 13 is rotated via the control device, each cylindrical support frame 4 is rotated by the same amount via the worm shaft 9, and each rolling roll 1 is moved by the same amount. It will be suppressed.

By the way, although not shown, in the meshing of the driven side gear 11 and the detection gear 15, in order to make the amount of reduction of the rolling roll 1 accurate, it is considered that mutual backlash does not occur.

That is, either the driven side gear 11 or the detection gear 15 is composed of two gears, and the gears 11 and 15 are attached so that the meshing portions are in opposite directions.

Therefore, if the meshing point of one gear is always in contact with the right rotation, the meshing point of the other gear is always in contact with the left rotation.

Further, the driven gear 11 and the drive gear 12 may be configured so that backlash does not occur, like the driven gear 11 and the detection gear 15.

By the way, in the above embodiment, the rotation amount of the worm shaft 9 is detected in order to detect the rolling reduction of the rolling roll 1, but the detection location is not limited to this, and for example, a direct cylindrical support may be used. The rotation amount of the frame 4 may be detected.

As described above, according to the configuration of the present invention, since the supporting frame for adjusting the rolling amount of each rolling roll is individually provided with the rotation driving device, the supporting frame is provided at the end of the supporting frame as in the conventional case. Since it is not necessary to provide a bevel gear for interlocking connection, it is possible to increase the drive transmission torque required for rolling down.

Further, by individually providing the rotary drive device for rolling each rolling roll, the rolling amount of each rolling roll can be individually adjusted freely.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a cross-sectional view of an essential part of a reduction device, FIG. 2 is a cross-sectional view of an essential part of a three-roll rolling mill, and FIG. 3 is a cross-sectional view of an essential part of a three-roll rolling mill showing a conventional example. 1 ... Rolling roll, 2 ... Roll holder, 4 ... Cylindrical support frame, 7 ... Worm wheel teeth, 9 ...
Worm shaft, 11 …… Drive side gear, 12 …… Drive side gear, 13
…… Hydraulic motor, 14 …… Detector, 15 …… Detection gear, 16
……Rotary encoder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichizo Taguchi 5-3-8 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. No. 3-28 Hitachi Zosen Co., Ltd. (56) Reference JP 54-133465 (JP, A) JP 49-88759 (JP, A) JP 4-143008 (JP, A) JP Flat 4-143007 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A rolling-down device for a three-roll rolling mill, in which three rolling rolls are radially arranged every 120 degrees, and a roll holder for holding each rolling roll is rotatably supported at an eccentric position. The teeth of the worm wheel are formed on the outer periphery of each support frame, and a worm shaft that meshes with the teeth of each of these support frames is provided, and a gear is provided at the end of each worm shaft and through this gear. A rotary drive device for rotating the worm shaft is provided, a detector for detecting the rotational position of each of the support frames is provided, and each rotary drive device is controlled based on a detection signal from the detector. A rolling down device for a three-roll rolling mill.