SU794401A1 - Apparatus for measuring friction contact forces at rolling - Google Patents

Description

one

The invention: relates to the field of measurement technology and can be used, in particular, in the rolling industry.

A load measuring device for rolling mills is known, which contains a split roller and inserts with sensing elements 1. The known device has a low measurement accuracy.

It is also known a device for measuring contact friction forces during rolling, comprising a split roller and an elastic liner associated with the roll body along a cylindrical bearing surface, measuring and compensating transducers located on opposite sides relative to the axis of symmetry of the liner and included in bridge circuit 2.

However, in such devices, when the working surface of the liner passes through the deformation zone, the liner bends not only under the action of friction forces, but also under the action of eccentrically applied forces of normal pressure. As a result, accuracy is reduced when measuring friction forces.

The aim of the invention is to improve the accuracy of the measurement of friction forces during rolling by compensating for the effects of eccentric compression on the liner.

The goal is achieved by the fact that the device is additionally equipped with two strain gauge sensors located radially on the undeformed part of the liner symmetrically with respect to its axis of symmetry, included in different shoulders of the bridge with successively available transducers, with a transducer located on the other side of the symmetry axis liner. FIG. 1 shows the proposed device with the cover removed; in fig. 2 shows a section along the axis of symmetry of FIG. one; in fig. 3 - scheme

location of strain gauges; in fig. 4 shows the connection of the strain gauges into the measuring half-bridge.

The device contains a roll 1, a cover 2, an elastic insert 3 with two cantilever

ledges. The liner through two wedge stops 4 is clamped in the roll housing. On the liner, using the axis 5 and the wedge clamp 6, a strain gauge transducer is attached to the flexure of the liner 7, on which are compensated a strain gauge 8 and a working tensor sensor 9. To eliminate the influence of the deformation of the liner from the normal pressure, the strain gauge 7 is connected insert through carrier 10 and rusk 11.

The strain gauge compensation system for eccentric compression includes strain gauges 12 and 13 pasted on the support part of the liner, which is not bent but deformed by normal pressure. Strain gages placed symmetrically neutral axis of the liner.

The strain gages 9 and 12 are included in one branch of the measuring half-bridge and the strain gages 8 and 13 - in the other branch of this half-bridge. Moreover, the magnitude of the electrical signal of the strain gauges 12, 13 and 9 is chosen to be equal. This equality is achieved by variable resistors R and when the insert is loaded with eccentric pressure on the press. After taturing, the variable resistors are replaced with constant ones.

The device works in the following way.

When the liner enters the deformation zone (Appendix A), the normal pressure compresses and bends the liner. When the liner bends, the resistance of the strain gauge 9 increases and the resistance of the strain gauge 12 decreases. Since the electrical signal of the strain gauges 9 and 12 is the same, the half-bridge does not become unbalanced.

Under the action of rolling pressure in the center of the insert, only compression of the insert occurs. In this case, the strain gauge 9 does not change its resistance from the effect of rolling pressure, the strain gauges 12 and 13 change the resistance by the same amount, which does not cause a half-bridge imbalance.

In Appendix B, the rolling pressure also compresses and bends the liner. Wherein

the resistance of the strain gauge 9 decreases and at the same time the resistance of the strain gauge 13 decreases. Since the strain gauges 9 and 13 are included in different branches

measuring half bridge, then its imbalance does not occur.

Thus, the proposed strain gauge compensation system for the off-center compression of the liner improves the accuracy

measuring friction forces with a roller torsometer.

invention formula

A device for measuring contact friction forces during rolling, containing its split roll and elastic liner, coupled with the roll body on a cylindrical bearing surface, measuring and compensating transducers located on opposite sides relative to the axis of symmetry of the liner and included in a bridge circuit characterized by that, in order to improve accuracy, the device is additionally equipped with two strain gauges located radially on the undeformed part of the liner symmetrically with respect to its and symmetry, and the inclusion in different

the shoulders of the bridge are successively available transducers, with a transducer located on the other side of the axis of symmetry of the liner being included in the shoulder with the transducer.

Sources of information taken into account in the examination

1. USSR Author's Certificate No. 434249, cl. G 01 L 1/04, 1974.

2. USSR author's certificate No. 94811, CL.2 G 01 L 1/04, 1951.

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Claims (1)

Claim A device for measuring contact friction forces during rolling, containing a split roll and an elastic liner associated with the roll body along a cylindrical bearing surface, measuring and compensating transducers located on opposite sides of the liner symmetry axis and included in a bridge circuit, characterized in in order to increase accuracy, the device is additionally equipped with two strain gauges located radially on the undeformed part of the liner symmetrically about its axis c mmetrov and included in different arms of the bridge in series available converters, and in the shoulder with the transmitter switched converter disposed on the other side of the axis of symmetry of the liner.