JPS586566Y2 - Roll tightening device for section steel rolling mill - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a roll tightening device for a rolling mill.

In particular, the plate thickness is automatically adjusted.

The present invention relates to a roll tightening device for a rolling mill suitable for use in a universal rolling mill or the like which is not equipped with a so-called AGC device.

Generally, in order to improve the dimensional accuracy of rolled products, the roll setting gap etc. are adjusted according to the elastic properties of the rolling mill.

However, the characteristics of a rolling mill will vary due to the presence of backlash in the rolls until a certain load is applied to the rolls, so it is necessary to apply a sufficient preload before starting rolling to eliminate the above variations. .

The preload required for this operation is 15
It ranges from 0 to 200 TON.

Conventionally, rolling equipment such as plate mill finish rolling machines is equipped with an AGC device that detects the thickness of a plate and controls the rolling amount as feedback. is equipped with sufficient reduction blades.

Therefore, in a rolling mill equipped with a rolling device having such a large rolling blade, the rolling device can be used for preloading work.

However, in conventional universal rolling mills, etc., no AGC device is provided, and the rolling device is formed as shown in FIG.

That is, a reduction screw 1 which transmits a reduction blade to a roll bearing box (not shown) is coaxially fitted with a worm wheel 2 by a spline, and a worm shaft 3 is meshed with the worm wheel 2.

The left and right worm shafts 3 are worm intermediate shafts 4
When connected, both are connected to the lowering motor 6 via the camp ring 5 on the one end side, and to the reduction gear 8 via the camp ring 7 on the other end side.

The speed reducer 8 includes a cell-syn transmitter 10 that detects the roll opening degree via a compulsion ring 9, and a limit switch 12 that regulates the upper and lower limit positions of the roll via a cap ring 11.
are connected.

In a rolling mill that is not equipped with such an AGC device, there is no need for rolling during one rolling, and the rolling motor 6 is only equipped with the driving force necessary to move the rolls, and the rolling mill does not need to be rolled during one rolling. It is not possible to generate a preload of as much as 150 to 200 TON, and the dimensional accuracy of the rolled product cannot be well controlled.

In addition, in conventional section steel mills, etc., a method of applying a preload between the upper and lower roll chock has been proposed. It is not possible to correct the
There is a problem that it is difficult to improve the dimensional accuracy of rolled products.

This invention was devised in view of the above conventional problems, and provides a roll tightening device for a rolling mill that corrects variations in the elastic properties of the rolling mill before the start of rolling and improves the dimensional accuracy of rolled products. The purpose is to

The roll tightening device for a rolling mill according to this invention is provided with a joint at the shaft end of a worm shaft connected to a rolling motor that moves the roll to a position where the upper and lower rolls come in contact with each other, and is fixed at both sides of this joint. the torque actuator is provided with a bracket having an output shaft that can be engaged with the joint portion, and is separately placed facing the joint portion and is movable horizontally; An engagement shaft that prevents rotation is provided, and the rolling standard can be set by tightening the rolls by applying a preload to the upper and lower rolls that are in contact with each other by connecting the torque actuator.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 2 is an explanatory diagram showing one embodiment of a roll tightening device for a rolling mill according to this invention.

Here, in the conventional example.

Members that have the same function as the lowering device are designated by the same reference numerals, and the explanation thereof will be omitted.

Sprocket 3A installed on worm shaft 3
and a sprocket 8A provided on the first speed reducer 8, and are connected by a chain 7AK wound around the sprocket 8A.

In this embodiment, a spline portion 2 is provided at the end of the worm shaft 3 opposite to the end to which the lowering motor 6 is connected.
1 is provided.

Further, brackets 22 are arranged on both sides of the spline portion 210, and the brackets 22 are provided with mounting holes 23.

A torque actuator 3 is installed in front of the spline section 21.
1 is disposed so as to be movable in the axial direction of the worm shaft 3.

A compression ring 32 is provided on the output shaft at the center of the torque actuator 31 .

The camp ring 32 has a spline formed on its inner peripheral surface so that it is connected to the spline portion 21 when the torque actuator 31 moves toward the worm shaft 3 side.

In addition, a retaining shaft 33 is protruded from the side surface of the torque actuator 31 on both sides of the coupling 320, and when the torque actuator 31 is moved to connect the camp ring 32 and the spline portion 21, one of the retaining shafts 33 is attached to the bracket 22. It is designed to be attached to the hole 23.

Namely. The torque actuator 31 is connected to the worm shaft 3 by connecting a compression ring 32 to the spline portion 21, and also connected to the engagement shaft 3.
3 is mounted in the mounting hole 23 to prevent rotation, and rotational force due to fluid pressure such as water pressure or oil pressure is transmitted to the worm shaft 3.

Next, the operation of the above embodiment will be explained.

When setting the roll reference position before the start of rolling, the rolling down device used to move the rolls to the position where the upper and lower rolls contact each other is first disassembled from the connection state between the worm shaft 3 and the torque actuator 31, as shown in FIG. Then, the pressure T motor 6 drives the reduction screw 1 to move the roll.

After the upper 10 wheels have contacted each other, the one-pressure T device is moved as shown in FIG. Mounting hole 23 for fastening
Connect to.

In this state, the torque actuator 31 is driven by water pressure or oil pressure to further rotate the reduction screw 1 to apply a sufficient preload to the roll, and the roll is rotated.

Corrects variations in the elastic properties of the rolling mill by eliminating backlash, etc.

According to the above embodiment, a sufficient preload can be applied to the rolls with a simple structure, so it is possible to improve the dimensional accuracy of the rolled product.

Furthermore, since a reduction motor and a torque actuator are used in combination, one tightening operation can be performed quickly.

Moreover, the hydraulic or hydraulic fluid commonly used in rolling mills can be used as the working fluid for the torque actuator, such as in roll balance, so the equipment can be easily installed.

Improvements to existing rolling mills can also be easily implemented.

Furthermore, in the above embodiment, since the torque actuator is detachable from the worm shaft, there is a stand exchange system in which a large number of roll stands are provided and the rolls are exchanged for each stand.

One roll tightening device can tighten the rolls of all stands.

In the above embodiment, the case where the torque actuator is detachable from the worm shaft has been described, but the torque actuator may be connected to the worm shaft at all times - in that case, the two may be connected via a clutch. death.

It is only necessary to connect the clutch and operate the torque actuator only when applying a preload.

However, in this case, for each roll stand,
It is necessary to install a torque actuator.

As described above, the roll tightening device for a rolling mill according to this invention includes a joint section provided at the shaft end of the worm shaft connected to the rolling motor that moves the rolls to a position where the upper and lower rolls come into contact with each other. Brackets fixed at both sides are provided, and a torque actuator is provided which has an output shaft that can engage with the joint part, and which is placed separately facing the joint part and is movable horizontally. An engagement shaft is provided that engages with the bracket to prevent rotation, and the rolling standard can be set by tightening the rolls by applying a preload to the upper and lower rolls that are in contact with each other by connecting the torque actuator. Therefore, the variation in the elastic properties of the rolling mill must be corrected before rolling begins.

This has the effect of improving the dimensional accuracy of rolled products.

[Brief explanation of drawings]

Fig. 1 is a front view showing a conventional rolling mill roll tightening device, Fig. 2 is a front view showing an embodiment of a rolling mill roll tightening device according to this invention, and Fig. 3 is a front view showing the same torque actuator. FIG. 3 is a front view showing a state of connection with a worm shaft. 6... Reduction motor, 31... Torque actuator.

Claims (1)

[Scope of utility model registration request] A joint part is provided at the shaft end of a worm shaft connected to a lowering motor that moves the rolls to a position where the upper and lower rolls come into contact, and brackets are provided fixed to both sides of this joint part and are engageable with the joint part. A torque actuator is provided which has an output shaft, is placed separately facing the joint part, and is movable horizontally, and the torque actuator is provided with an engagement shaft that engages with the bracket to prevent rotation. A roll tightening device for a shaped steel rolling mill, characterized in that a rolling standard can be set by tightening the rolls by applying a preload to the upper and lower rolls in contact by connecting the torque actuator.