JPH024725Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thrust load detection device for a rolling roll.

Generally, when rolling a steel plate, a rolling load of several hundred to several thousand tons is applied to a rolling roll chock, and at this time, the thrust force applied to the bearings of the rolling roll chock is usually said to be 1 to 2% of the rolling load.

However, due to poor centering of the rolled steel plate or inappropriate rolling roll curves, the thrust force applied to the bearings of the rolling roll chock may increase dramatically, and bearing burnout accidents often occur in actual operations.

Every time a bearing burns out, rolling has to be interrupted, resulting in a drop in productivity.

In order to prevent this bearing from burning out, conventional methods have been to detect the load by attaching a strain gauge as a load detection element to the surface of the rolling roll choke, or by attaching a strain gauge to the keeper plate for fixing the rolling roll choke. That's what I was doing.

However, in the case of a detection means in which a strain gauge is attached to the surface of a rolling roll chock,
There are problems such as that it is difficult to accurately grasp in advance the stress distribution state of a rolling roll chock having a complicated shape, and that it is not easy to calculate the stress from the detected distortion.

Further, in the case of a detection means in which a strain gauge is attached to a keeper plate, there is a problem in that the detection accuracy is poor because the keeper plate is separated from the bearing of the rolling roll chock where thrust force is generated.

The present invention is intended to solve these conventional problems, and an example of its implementation will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rolling roll, and this rolling roll 1 is supported by a rolling roll chock 2 at its neck portion through a bearing 3 of the rolling roll chock 2. Responsible for the applied radial load.

The bearing 3 is secured to the neck of the roll roll 1 by a bearing retainer ring 5 attached to both end faces of the roll chock 2 by bolts 4, and a tightening nut 6 screwed to the end of the neck of the roll roll 1. It is held between the outer periphery of the first part and the second inner periphery of the rolling roll chock.

7 is a backup roll choke, 8 is a housing post, and 9 is a keeper plate.

Here, when a thrust load is applied to the rolling roll 1, since the rolling roll chock 2 is fixed to the back up roll chock 7 and the back up roll chock 7 is fixed to the housing post 8, Considering these as one rigid body, the thrust force is received by each bearing retainer ring 5 attached to the rolling roll chock 2 with bolts 4.

Therefore, in the present invention, a strain gauge 10 as a load detection element is attached to each bolt 4 fixing the bearing retainer ring 5 on both end faces of the roll chock 2, and the thrust load applied to the roll roll 1 is measured, for example. The thrust load in the direction of the neck end of the roll 1 (in the direction of arrow A in FIG. 1) is detected as a minute displacement of each bolt 4 of the bearing retainer ring 5 on the neck end side. The thrust load in the direction of the body (in the direction of arrow B in FIG. 1) is detected as a minute displacement of each bolt 4 of the bearing retainer ring 5 on the body side.

As an example of attaching the strain gauge 10 to each bolt 4, as shown in FIG.
A small-diameter stepped portion 4c is provided between the threaded portion 4a and the neck portion 4b, and strain gauges 10 are respectively attached to symmetrical positions of the small-diameter stepped portion 4c.

The lead wire 10a of each strain gauge 10 is
From the center of the head of the bolt 4 to the strain gauge 1
0 through the insertion hole 4d that extends across the outer peripheral surface of the small-diameter stepped portion 4c.

The reason why two strain gauges 10 are attached to one bolt 4 is to compensate for the bending applied to the bolt 4. By taking the average value of the detected value of the thrust load applied to the bolt 4, Accurate load detection values can be obtained regardless of the

The strain gauge 10 is connected to a bridge circuit in the same manner as before, the output side of the bridge circuit is connected to a strain meter, the output side of the strain meter is connected to an electromagnetic oscilloscope, etc., and the measured values are recorded. By doing so, the thrust load of the rolling roll can be measured.

In this case, the measured value of the thrust load of the rolling roll is the sum of the measured values in the measurement system for each strain gauge 10 of each bolt 4.

As described above, according to the present invention, the entire thrust load applied to the rolling roll is detected as the elongation of the bolt for fixing the bearing holding ring via the bearing in the rolling roll chock and the bearing holding ring. Load can be detected with high accuracy.

Furthermore, since it is easy to accurately grasp the relationship between load and strain for each fixing bolt of the bearing retaining ring in advance, it is extremely easy to convert strain into load.

Note that the present invention is applicable not only to detecting the thrust load of a rolling roll but also to detecting the thrust force generated in a bearing that supports a rotating body.

[Brief explanation of the drawing]

FIG. 1 is a schematic view showing an example of the implementation of the present invention, and FIG. 2 is an enlarged view showing a mode in which a strain gauge is attached to a fixing bolt of a bearing retaining ring.

Claims (1)

[Scope of utility model registration request] A thrust load detection device for a roll roll, characterized in that a load detection element is provided on the shaft of a bolt for fixing a bearing holding ring in a roll chock.