CN2274338Y

CN2274338Y - Dynamic plate-shape detection device for metal thin belt material

Info

Publication number: CN2274338Y
Application number: CN 96236250
Authority: CN
Inventors: 王振瑛
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-02
Filing date: 1996-09-02
Publication date: 1998-02-11
Anticipated expiration: 2006-09-02

Abstract

The utility model relates to a dynamic plate-shaped detection device for metal thin belt material, mainly comprising a clamping and conveying roller for strip material to be detected, a vibration exciting device, a vibration detecting sensor and a computer for processing signals outputted by the sensor, wherein, the vibration exciting device is an eccentric guide roller tightly contacted with the strip material to be detected along a width direction, and the vibration detecting sensor is a non-contact displacement sensor. The utility model utilizes the rotation of the eccentric guide roller to make the strip material generate vibration and adopts a method measuring the transient vibrating energy spectrum of the strip material to determine the plate-shaped quality of the strip material, and the dynamic plate-shaped detection device for metal thin belt material not only has simple structure, but also doesn't need to carry out special vibration exciting operation.

Description

The dynamic sheet shape pick-up unit of metal thin strip

The utility model belongs to the detection technique of strip material flatness, is a kind of dynamic sheet shape pick-up unit of metal thin strip.

The flatness of metal plates and strips, promptly plate shape is the important quality index of strip material.Metal thin strip will be covered its macroscopical flatness defects under the tensioning situation, therefore in the production run of thin strip its plate shape is implemented detection of dynamic, be a crucial link so that in time eliminate its flatness defect.For thin strip, the plate shape under it is dynamic is detected the band that can adopt excitation method to make tensioning usually and is produced mechanical vibration, measures its vibration frequency with sensor then, is converted into the qualitative data of plate shape at last again by computing machine.Chinese patent CN1056573A discloses a kind of sheet metal strip plate shape pick-up unit.This device has an exciting device of being made up of oil cylinder and exciting beam, and the lifting of hydraulic oil cylinder driving exciting beam is with the band tensioning, give exciting force of band by instantaneous reverse then, make band produce vibration, reusable sensor is measured its vibration frequency, is converted into the strip shape quality data at last.Because this device commutates by hydraulic pressure and produces exciting force, so a cover specific hydraulic system must will be set.In addition, parts such as exciting beam, oil cylinder also will take bigger space, and its operation is trouble again, thereby settle this pick-up unit in the production scene and implement detection of dynamic and can bring inconvenience to production.

Task of the present utility model provides a kind of simple in structure, and the dynamic sheet shape pick-up unit of the metal thin strip of being convenient to operate.

The solution that realizes the utility model task is: the dynamic sheet shape pick-up unit of the metal thin strip that is provided comprises the pinch roll of a pair of tested band, the exciting device of a tested band and the vibration-measuring sensor of tested band and the computing machine that this sensor output signal is handled.Special character of the present utility model is: the exciting device of above-mentioned tested band is an eccentric guide roller that closely contacts with tested band broad ways, and said vibration-measuring sensor is a non-contact displacement transducer.Tested band is stretched between pinch roll and the guide roller, because guide roller is eccentric, so can cause the vibration of tested band during the guide roller rotation.Utilize non-contact displacement transducer to change the displacement signal of band instantaneous vibration into electric signal, thereby can obtain the instantaneous vibration power spectrum of band, this power spectrum is relevant with the plate shape of band.By computing machine this measurement result and calibration value are compared, can obtain the strip shape quality data of band.

The eccentric throw of above-mentioned eccentric guide roller generally can be preferably the 0.02-0.04 millimeter below 0.05 millimeter.Sensor can adopt distance measuring sensors such as current vortex, laser, inductance, electromagnetism.

The rotation of the eccentric guide roller of the utility model utilization makes band produce vibration, not only can save exciting device complicated in the prior art, and structure is simplified greatly, and need not to carry out special exciting operation.Because the utility model is the basis for estimation that adopts vibrational spectrum to be used as band plate shape, so, under many occasions, can directly utilize in the production line guide roller as exciting device.As in the strip-rolling production line, the guide roller before the winder is owing to always there is certain off-centre in reasons such as machining deviation, and the caused band vibration of eccentric thus guide roller has been enough to satisfy detection requirement of the present utility model.This brings great convenience just for on-the-spot real-time detection.

Below in conjunction with accompanying drawing content of the present utility model is illustrated.

Fig. 1 is a structure diagram of the present utility model.

Fig. 2 is the band energy of vibration spectrogram that the utility model is measured.

Fig. 3 is the band energy of vibration spectrogram of an example of the utility model.

As shown in Figure 1: the tested band 1 in advancing is stretched between a pair of pinch roll 2 and the eccentric guide roller 3, Therefore band 1 just can produce vibration in the process of advancing. Non-contact displacement transducer 4 is positioned at pinch roll 2 and leads To the middle part of 3 on roller, it is the signal of telecommunication with the vibration displacement signal transition of band 1, turns to by A/D plate 5 again Be changed to data signal and deliver to computer 6 and compare and calculation process resulting strip shape quality number with calibration value According to delivering to display 7 and plate shape control executing agency 8. Above said calibration value be to adopt traditional bar method of cuing open will be real Border plate shape value and detected value of the present utility model contrast and draw.

The band vibrational spectrum of certain test point that is recorded by sensor 4 as shown in Figure 2. Abscissa represents to measure among the figure Time t, ordinate represent the band vibration displacement S corresponding to test point. Then the functional relation of displacement and time can be shown Be shown: S=f (t), its area E represent band at a time between vibrational energy in the interval. If corresponding to different test points Strip Shape quality difference, it is different namely to extend difference, their tensioning state is also with regard to corresponding difference so, reaction exists Area on the vibrational spectrum is also just different with form. Therefore, the vibrational energy of each point is poor in the identical time interval Be the plate shape correlation of each point.

Embodiment: be provided with a pair of pinch roll and diameter and be 200 millimeters guide roller behind Φ 160/ Φ 460 * 750 four-high mills, the eccentric throw of this guide roller is 0.02 millimeter, and mill speed is 600 meters/minute, and rolling steel band is 0.35 * 600mm.Three HZ-8500 eddy current displacement sensors of horizontal installation along steel band, its HY6070 type A/D change-over panel interior with being installed in 486 industrial computers connects, can record 1024 shift values in a period of time, the curve of these shift value representatives is the vibrational spectrum distribution function.Figure 3 shows that section energy of vibration spectrogram that interior above-mentioned three sensors record sometime.The energy spectrum function f of B point (being positioned in the middle of the band) among the figure ₂(t) area is big, and the energy spectrum function f of A, C point (being positioned at band both sides portion) ₁(t), f ₃(t) area is little.It is poor bigger to illustrate that the constantly corresponding band center section of detection therewith extends, and the extension difference on both sides is less, and promptly loose in the middle of the band, both sides are tight.

Claims

1, a kind of dynamic sheet shape pick-up unit of metal thin strip, the pinch roll (2) that comprises a pair of tested band, the exciting device of a tested band and the vibration-measuring sensor of tested band (4) and the computing machine (6) that this sensor output signal is handled, the exciting device that it is characterized in that said tested band is an eccentric guide roller (3) that closely contacts with tested band broad ways, and said vibration-measuring sensor (4) is a non-contact displacement transducer.

2, plate shape pick-up unit as claimed in claim 1, the eccentric throw that it is characterized in that said eccentric guide roller (3) is the 0.02-0.04 millimeter.

3, plate shape pick-up unit as claimed in claim 1 is characterized in that said non-contact displacement transducer is an eddy current displacement sensor.