JPS62163901A - Roll for detecting shape - Google Patents

Abstract

PURPOSE:To prevent a possible slip, by a method wherein a thin film like gas is interposed between a rotary part and a stationary part to support the rotary part with the gas so as to make the tracking property of a shape detecting roll better at acceleration or the like to provide synchronization between the speed of a steel plate and the circumferential velocity the of a roll without providing any auxiliary driver such as DC motor. CONSTITUTION:A high pressure air is sent into a hollow part of a hollow shaft 8 as bearing gas from an air feed port 10. This air is forced from a nozzle 11 into between the inner wall of a circular hole of a disc 2 and the outer wall of the follow shaft 8, where it is made a thin film to support a radial load of a roller 1. This enables the formation of a support surface for a load over the radial entire length of the roller 1. In addition, a part of high pressure air fed is forced into the end face of a roller via a bypass 12 thereby supporting thrust-direction load with air.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a roll for detecting the shape of a sheet material such as a steel plate (strip), aluminum foil, aluminum plate, or paper, such as a roll used in a cold rolling mill. The present invention relates to a shape detection roll that is installed on the exit side and has a built-in sensor for shape detection.

[Conventional technology]

This type of shape detection roll has conventionally had a structure as shown in FIG.

The roll assembly 1' is constructed by stacking a large number of disks 2' of the same shape in the axial direction and tightening them with tie rods, that is, long axial bolts.

A sensor 5' is attached to the disk 2' near its outer periphery, measures the tension of each disk, and transmits a measurement signal to the outside via a signal converter or the like. An end plate 3' is integrally fixed to the end of the roll assembly 1', and a central axis 4' is formed in the end plate 3'.

A roll assembly 1' for shape detection is attached at a position corresponding to a priddle roll on the rolling mill side, and is supported by a rolling bearing fitted into a central shaft 4'. A DC motor is coupled to the central shaft 4' for auxiliary driving thereof. (For example, see Japanese Patent Application Laid-Open No. 54-68283.) [Problems to be Solved by the Invention] As described above, in the conventional device, it is necessary to install a DC motor to auxiliary drive the roll assembly 1'. there were. This is due to the following reason.

Accurate measurements cannot be made unless the circumferential speed of the roll assembly 1' for shape detection is matched with the speed of the steel plate coming out of the rolling mill to prevent the roll assembly 1' from slipping. Also, there is a gap of 0.00 mm between the disks 2' of the roll assembly 1'. Lm■
Since the tension is detected within a range corresponding to the width of the disk, if a slip occurs, the gap will cause a flaw on the surface of the steel plate.

However, the roll assembly 1' for shape detection has a complicated internal structure with a large number of sensors, tie rods, etc. attached, and therefore has a large moment of inertia, several times as large as that of a priddle roll. Nevertheless, similar to the priddle roll, a rolling bearing with a large coefficient of friction is used as a bearing, and the followability of the roll assembly 1' is poor.

In order to improve this followability, the roll assembly 1' is connected to a DC motor, the speed of the steel plate is detected, and the output of the DC motor is adjusted so that the circumferential speed matches it.

The above is the reason for auxiliary drive using a DC motor,
Auxiliary drive requires quite large-scale equipment,
A means to accurately measure the speed of the steel plate is also required. Even if auxiliary drive is used, it is actually quite difficult to suppress the slip ratio within an allowable value (for example, 2% or less) over the entire speed range, including during acceleration and deceleration, due to the characteristics of the motor and other factors.

Furthermore, when modifying the rolling mill to replace the roll assembly for shape detection with a priddle roll, extensive modification work is required since an auxiliary drive motor is attached.

This invention aims to solve these problems in the prior art.

[Means for solving problems]

In order to solve the problem, the following measures were taken in this invention.

In a roll for detecting the shape of plates, foils, etc., there is a rotating part that includes a roll assembly made by overlapping a number of disks with built-in sensors in the axial direction, and a fixed part that is fixed to a roll stand. A thin film of gas was interposed between them, and the rotating parts were supported by this gas. In other words, the shape detection roll is supported by a gas bearing with a very small coefficient of friction.

In one preferred embodiment of the present invention, the rotary part is provided with a circular hole penetrating in the axial direction at the center thereof, and the fixed part includes a hollow shaft fitted in the circular hole. There is one in which a thin film of gas is interposed between the inner wall of the circular hole and the outer wall of the shaft. In another embodiment, a center shaft is provided at both ends of the rotating portion in the axial direction, similar to a conventional roll, and a hole into which the center shaft is fitted is provided in the fixed portion, A thin film of gas may be interposed between the inner wall of the hole and the central axis.

(Embodiment) First, an embodiment of the present invention will be described with reference to FIG. 1.2, in which there is a hole passing through the center of the rotating part in two axial directions, and a hollow shaft is fitted into the hole.

The shape detection roll 1 has a structure in which a large number of disks 2 are stacked in the axial direction, and the disks 2 are tightened together by tie rods 6. The disk 2 is annular and has a built-in sensor 5 near its outer periphery. A charge amplifier 7 is placed at the end of the roll 1 to amplify the signal from the sensor 5. An annular rotational signal converter 13 is attached at a position adjacent to this, and the measurement signal of the sensor is taken out to the outside via this.

As is clear from FIG. 2, which shows the cross section of the disk 2, there are three tie rods 6, and nine holes 14 through which the tie rods 6 are passed are bored at equal intervals in the circumferential direction. (phase) may be shifted. Further, in order to minimize the moment of inertia of the disk 2, a large number of cavities 15 are provided at equal intervals.

A circular hole is formed in the center of the annular disk 2, and when the tie rod 6 is tightened, the hole passes through in the axial direction. A hollow shaft 8 is fitted into this hole, and the end of the hollow shaft 8 is fixed to a roll stand 9 with a bolt. High-pressure air as a bearing gas is fed into the hollow portion of the hollow shaft 8 from an air supply port 10 . This air is pumped from the nozzle 11 between the inner wall of the circular hole in the disk 2 and the outer wall of the hollow shaft 8, forming a thin film there to support the radial load of the roller 1. Therefore, a load supporting surface can be formed over the entire length of the roller 1 in the axial direction. Furthermore, by press-fitting a portion of the supplied high-pressure air into the end face of the roller through the bypass passage 12, the load in the thrust direction is also supported by the air.

In other embodiments, gas bearings can be installed at both ends of the roll. In other words, like the one shown in Figure 1, central shafts are formed at both ends of the roll, which is the rotating part, and holes into which the central shafts are fitted are formed in the fixed part, with a thin film of air interposed between them to support the roll. . In this case, a sufficient bearing area can be secured by increasing the length of the central axis.

〔Effect of the invention〕

As detailed above, in the present invention, the swelling/softening detection roll is supported by a gas bearing with a very small coefficient of friction.

Therefore, the followability of the shape detection roll is good during acceleration, etc., and the speed of the steel plate and the circumferential speed of the roll can be synchronized and the occurrence of slip can be prevented without providing an auxiliary drive device such as a DC motor. Furthermore, a control device for the auxiliary drive device is naturally unnecessary. Since these devices can be omitted, the shape detection roll can be installed inside the roll stand at the position where the bridle roll was conventionally attached, and the shape detection roll and the bridle roll can be easily replaced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of a disk in a direction perpendicular to FIG. 1, and FIG. 3 is a sectional view of a conventional shape detection roll.

Claims (3)

[Claims] (1) A thin film of gas is interposed between the rotating part, which includes a roll assembly made by stacking a large number of disks with built-in sensors in the axial direction, and the fixed part fixed to the roll stand. A shape detection roll characterized in that the rotating part is supported by the gas. (2) A circular hole penetrating in the axial direction is provided in the center of the rotating part, and the fixed part includes a hollow shaft fitted in the circular hole, and the inner wall of the circular hole and the shaft A shape detection roll according to claim 1, wherein a thin film of gas is interposed between the roll and the outer wall of the roll. (3) A center shaft is provided at both axial ends of the rotating portion, and a hole into which the center shaft is fitted is provided in the fixed portion, and a thin film is formed between the inner wall of the hole and the center shaft. 2. A shape detection roll according to claim 1, in which a gas is interposed.