JPS6138465A - Apparatus for detecting rotary speed of roller - Google Patents

Abstract

PURPOSE:To measure the number of rotations of a magnet, by providing the magnet to a guide roller and arranging an iron core coil to the surface of a roller holder so as to be close to said magnet while detecting an induction current in a moment when the magnet is rotated to pass the iron core coil. CONSTITUTION:A magnet 1 is embedded in the end surface of a guide roller 6 and a detection head 4 is fixed to the outside of a roller holder 3 by a bracket 5 and a rivet 7. An iron core coil 2 and an amplifier 8 are mounted in the detection head 4 and the gap between the head 4 and the magnet 1 is set to the very limit. Then, the weak induction current generated in a moment, when the magnet 1 passes the iron core coil 2 with the rotation of the roller 6, is amplified and detected to make it possible to measure the number of rotations of the roller 6. By this method, because the abrasion state of a bearing can be displayed on an indicator as the reduction in a speed, the adequate replacement time of the bearing can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Objective A of the Invention: Industrial Field of Application The present application seeks to provide a roller rotation speed detection device for a rolling guidance device or the like.

In rolling operations, troubles caused by damage to guide roller bearings can result in slippage scratches on the finished products, or can cause a reduction in production, such as having to suspend a production line to recover from the trouble. .

This invention focuses on the fact that the number of rotations of the guide roller decreases as the bearing life of the guide roller decreases, and attempts to determine whether there is an abnormality in the bearing by detecting the number of rotations of the guide roller.

B. Conventional technology and its problems A. Based on experience, the entire condition of the guide roller bearing was replaced as soon as possible during which troubles occurred due to wear. This method resulted in high management costs, such as having to replace the bearings that withstood extreme use, increasing running costs, and having to strictly manage the timing of replacements.

Town: Pass current through the contact switch and apply 1 to the roller rotation.
There are devices that measure the IlJ'i connection of flow, but rollers such as wire rods run at 10,000 to 40,000 rpm, so single-contact types can cause the contact to fly or wear out. It was inappropriate.

01 There was a method of detecting abnormal vibrations of the rotating shaft by changes in the vortex flow, but the guide rollers are directly exposed to noise such as images from the rolling mill and vibrations when the product passes at high speed. Furthermore, there was no guarantee that the sensor would withstand harsh external environments such as heat and water. (Reference: JP-A-59-97315) The location and time of trouble occurrence cannot be easily determined.

(2) Structure of the Invention Means for Solving the A0 Problem The present invention attempts to solve the above-mentioned problem by using the structure of the lower Be. That is, by engraving a magnet on the roller and fixing the iron core coil to a roller holder, it is possible to prevent the generation of a weak induced current in the coil at the moment when the magnet passes through the iron core coil f as the roller rotates. The aim is to use this current to amplify and detect the current.

B6 Embodiment of the invention The present invention is a guide roller 6 in a rolling 8 guiding device.
A magnet 1 is installed in the roller holder 3, and an iron core coil 2 is installed in the roller holder 3 so as to be as close as possible to the magnet 1. It is configured to measure the number of rotations of the roller by detecting the rt flow.

Each component will be explained in detail below.

A magnet 1 is embedded in the end face of a guide roller 6.

The detection head 4 is located outside the roller holder 6).

It is fixed by a racket 5 and screws 7. The detection head 4 has a built-in iron core coil and an amplifier 8, and the gap between the head 4 and the magnet 1 is set within the quantity. Detection head 4 and j+
How many books 9 are connected with a shielded wire 16, and a sensor 10' is placed in front of the guide roller 6 that runs from the itI controller to the external terminal alarm 11 and indicator 12!
In the i-arrangement, the finished product 14 flows in long units, so there are times when the finished product does not pass the guide roller 6. At that time, the rotation of the guide roller naturally decreases, so this is considered an abnormality and the indicator 12 is displayed. Since it would be inconvenient for the alarm 11 to be activated, it is necessary to cancel this period. Therefore, it is used to send a signal to the controller 9 so that it operates only when a product is passing through.

IIl. Effects of the invention A: Since the state of bearing wear is shown on the indicator as a decrease in speed, appropriate bearing replacement timing can be managed.

B. Since it prevents bearing troubles, it contributes to improving the quality of finished products and -1 - increases the operating rate of rolling operations.

C8 You can tell at a glance which guide roller bearing has reached its lifespan.

[Brief explanation of drawings]

FIG. 1 is a front view, FIG. 2 is a front view of the iron core coil, and FIG. 3 is a sectional view taken along line A-A. 1 , , , , Magnet - 2 , , , Iron core coil 3
, , , , Roller holder 6 , , , Guide roller.

Claims (1)

[Claims] A magnet 1 is provided on a rotating body such as a guide roller 6 in a rolling guidance device, and an iron core coil 2 is placed on the roller holder 3 so as to be as close as possible to the magnet 1. A roller rotation speed detection device characterized by being configured to measure the rotation speed of a roller by detecting an induced current instantaneously passing through a core coil.