JPH0221330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tension detection device for measuring the tension generated in a rolled material between a planetary inclined roll rolling mill and another rolling mill placed behind it. .

Established as a planetary inclined roll rolling machine in 1974.
As shown in Fig. 1, the basic structure of the rolling mill disclosed in Publication No. 43980 is that three or more (in this case, three) conical rolls surround a rolled material A having a circular cross section or a polygonal cross section close to this. 8 rotates on its axis and revolves around it to draw the rolled material A. That is, three roll shafts 7 each having a conical roll 8 attached to the tip thereof are rolled into a rolled material A in a roll head 6.
The roll heads 6 are arranged at equal intervals on the inclined axis of the
is fitted into and held by a rotor 2 rotatably supported by a fixed housing 1 on a base B via bearings 3 and 4, and is rotationally driven together with the rotor 2 by a bevel gear set 12.

In addition, three planetary gears 14 meshing with the sun gear 13 each pass through a bevel gear set 15 to a conical roll 8.
The sun gear 13 is connected to the bevel gear set 16.
This makes it possible to provide auxiliary rotation.

As described above, the rolled material A is compressed by the rolling force caused by the rotation of the three conical rolls 8 and is simultaneously fed. Furthermore, twisting of the rolled material A that may occur during rolling is corrected by rotation of the sun gear 13.

By the way, when rolling work is performed using multiple rolling mills in series, tension is generated in the rolled material due to the difference in roll speed between the front and rear rolling mills, but this tension is necessary to obtain rolled material with quality above a certain standard. It is necessary to control the tension to below a certain value (for example, below 0.5 Kg/mm ² ), and various tension detection devices have been developed depending on the rolling equipment. In the case of a conventional planetary inclined roll rolling mill, as shown in FIG. 2, a fixed housing 1 is installed on a base B via a base plate C, and
A pressure detection element 10 is provided on the base B separately and independently from the housing 1, and when tension of the rolled material A occurs, this tension is transmitted and the lower base plate C is deflected. There was a tension detection device configured to determine the tension of the rolled material A by measuring the amount using the pressure detection element.

Therefore, in order to detect tension with high precision, it is necessary to weaken the rigidity of the bed plate and increase the amount of deflection to a certain extent.
As is clear from Figure 2, due to its structure, the center of gravity is located behind the installation position, so it will be installed in a cantilevered state, so it must be firmly attached to the base plate on the base. It was also necessary to increase the rigidity of the base plate itself, which created a contradiction in the design of the base plate and made the design difficult. Furthermore, as rolling mills become larger, problems arise with conventional tension detection devices in terms of installation stability and work safety.

This invention was made in view of the above-mentioned points, and the tension of the planetary inclined roll rolling mill is high, and the tension of the rolled material can be detected with high accuracy, the rolling mill can be installed reliably and firmly, and the installation structure is simple. The purpose is to provide a detection device.

An embodiment of the present invention will be described below with reference to FIG. The overall basic structure is the same or equivalent to that shown in FIGS. 1 and 2, and the fixed housing 1 is installed on a base (not shown). It can be installed directly on the base without intervening the base plate C as shown in the figure.

A rotor 2 is rotatably supported by the housing 1 via a thrust bearing 3 and a radial bearing 4, and a roll head 6 is disposed between the rotor 2 and a rotor ring 5 partially connected to the rotor 2 at the rear thereof. are fitted and retained. Also, roll head 6
Inside, three roll shafts 7 having conical rolls 8 attached to their tips are arranged at equal intervals on the inclined axis of the rolled material A.

Further, a hollow shaft 9 through which the rolled material A is fed is rotatably supported within the rotor 2 via a bearing.

Reference numeral 10 denotes a pressure detection element such as a known load cell, strain gauge, or pressure measuring pin, which is located between the rear end of the inner ring 3a fixed to the rotor 2 side of the thrust bearing 3 and the bearing box 3b fixed to the housing 1 side. Alternatively, a locking plate 11 is provided protruding from the rotor 2, and is arranged between the locking plate 11 and the bearing box 3b.
In addition, the code|symbol D has shown the following rolling mill roll.

Therefore, the tension generated by the speed difference Δν between the speed ν ₁ of the rolled material A sent out from the conical roll 8 and the speed ν ₂ of the rolled material A on the inlet side of the roll D of the subsequent rolling mill is It is transmitted from the roll shaft 7 to the roll head 6 to the rotor ring 5 to the rotor 2 in this order, and further transmitted to the housing 1 via the thrust bearing 3.
Since the rolled material A can be moved by the distance in the axial direction within
The rotor 2 moves in the axial direction due to the tension generated in the thrust bearing 3, and a thrust force is generated in the thrust bearing 3. Since the rotor 2 is supported by the radial bearing 4 together with the thrust bearing 3, the frictional resistance is small, and the friction resistance is small. Since a thrust force is generated due to a change in pressure, the pressure detection element 10
The tension acting on the is accurately measured.

Specifically, for example, when a load cell is used as the rolling detection element, the tension between the planetary inclined roll mill and the subsequent rolling mill is expressed by the following formula.

F = F ₁ - W μ where F = Thrust force (kgf) F ₁ = Load cell measurement value (kgf) W = Weight of roll, roll head and rotor (Kg) μ = Bearing friction coefficient Tension T = F/A (kgf) /mm ² ) A = Cross-sectional area of rolled material (mm ² ) And since the W, μ and A values in the above formula can be known by measurement or calculation in advance, if F ₁ is measured with a load cell, the tension T can be calculated. can be easily determined.

Note that if the roll speed ν ₂ of the subsequent rolling mill is slower than the speed ν ₁ of the conical roll 8, a compressive force may act on the rolled material A, but the tension referred to in this application also includes this compressive force. In order to particularly accurately measure this compressive force, the pressure sensing element 10 may be provided, for example, not only on the rear end side of the inner ring 3a of the thrust bearing but also on the front end side.

As described above, the tension detection device of the present invention includes:
In a planetary inclined roll rolling mill, a rolling detection element is installed in the thrust bearing between the fixed housing and the rotor to detect the axial force of the rotor, thereby detecting the axial force between the rolling mill and the following rolling mill. By measuring the tension in the rolled material generated in the process, the following effects can be achieved.

(1) The housing of the rolling mill does not need to be structured so that it bends under tension when subjected to tension, so it can be firmly installed on the base.
Installation is stable and work safety is improved.

(2) The special design of the base plate on the base, which was required in the past, is no longer necessary, the structure for installing the housing is simplified, and the weight is also reduced.

(3) Unlike conventional methods, this method is not limited by the size of the rolling mill, and can be applied to particularly large rolling mills.

(4) When subjected to tension, the thrust force of the rotor transmits the tension more directly than the deflection of the lower part of the rolling mill housing, and the response can be more sensitive, so the detection accuracy is higher and the rolling Since the tension in the material can be measured accurately, the rotor speed between rolling mills can be adjusted accurately, improving the quality of the rolled material.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a planetary inclined roll rolling mill embodying the present invention, Fig. 2 is a front view of a rolling mill equipped with a conventional tension detection device, and Fig. 3 is a schematic cross-sectional view of a rolling mill equipped with a conventional tension detection device. It is a partial cross-sectional plan view. DESCRIPTION OF SYMBOLS 1... Fixed housing, 2... Rotor, 3... Thrust bearing, 3a... Inner ring, 3b... Bearing box, 4... Radial bearing, 5... Rotor ring, 6... Roll head,
7... Roll shaft, 8... Conical roll, 9... Hollow shaft, 10... Pressure detection element, 11... Locking plate, 12,
15, 16...Bevel gear set, 13...Sun gear, 14...
Planetary gear, A...rolled material, B...base, C...base plate, D
…Subsequent rolling mill rolls.

Claims (1)

[Claims] 1. A rotor rotatably supported in a fixed housing via a bearing holds a roll head, and three or more roll shafts each having a conical roll attached to the tip are used to roll the material within the roll head. The tension of the planetary type inclined roll rolling mill is arranged on an inclined line of In the detection device, a pressure detection element is disposed in the thrust bearing between the fixed housing and the rotor to detect the axial force of the rotor, thereby detecting the pressure in the rolling mill and other rolling mills disposed behind it. 1. A tension detection device for a planetary inclined roll rolling mill, characterized in that the tension in a rolled material generated between the two is measured.