JPH10330003A - Non-contact transfer device of belt shape material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the float up amount of a belt shape material simply without increasing machine parts by measuring an electrostatic capacity between an electrode consisting of the conductive body arranged on a pressure receiving surface and a belt shape material. SOLUTION: An air is blown out from a spouting hole provided on the pressure receiving surface 2 of a metal horizontal floater 1 separatingly each other in the advance direction of a steel belt S and the steel belt S is floatingly supported on the pressure receiving surface 2 and transfered by a non-contact state. An insulator 4 installed on the pressure receiving surface 2 by pasting and plural sheet metals 6 formed pilingly a conductive body as an electrode 5 are arranged in the width direction and advance direction of the steel belt S at a nearly equal interval by three pieces and three rows respectively. When the electrostatic capacity between the electrode 5 and the steel plate S is measured by a float up amount measurement device 7, as a mutual interference is generated when the whole electrodes 5 are measured simultaneously, the distribution of the float up amount of the steel belt S can be detected by switching the electrode 5 subjected by switches S1 -S9 and measuring the electrostatic capacity individually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for floatingly supporting a conductive strip, for example, a steel strip, by a gas blown from a blowout hole provided on a pressure receiving surface of a floater, and transferring the strip in a non-contact manner.

[0002]

2. Description of the Related Art In a non-contact transfer device of this kind, a method of measuring a floating amount of a steel strip from a pressure receiving surface generally includes:
Obtains distances L ₁ between the steel strip and the distance measuring sensors by its reflection from the distance measuring sensor which is disposed on a side away from the pressure receiving surface of the steel strip is irradiated with a laser or ultrasonic waves to the steel strip, the pressure receiving surface is known distance by the distance L ₂ between the measuring sensor reducing the distance L ₁ between the steel strip and the distance measuring sensor, which was to measure the flying height is known to.

[0003]

However, in the method of disposing the distance measuring sensor on the side of the steel strip away from the pressure receiving surface, not only the distance measuring sensor as a mechanical component takes up space, but also the running plate is used at the beginning of the operation. The steel strip must pass through the space between the pressure receiving surface and the distance measurement sensor when
The workability is poor, and in order to measure the flying height distribution in the traveling direction and the width direction of the steel strip, it is necessary to arrange a plurality (a large amount) of distance measuring sensors, resulting in an increase in cost.

[0004] Further, the contact between the steel strip and the pressure receiving surface causes damage to the steel strip, which is a serious problem in the manufacture of the steel strip.
It is difficult for the distance measuring sensor to detect the boundary where the steel strip does not contact the pressure receiving surface, and therefore it is difficult to output an alarm for occurrence of a flaw in the steel strip due to the contact.

SUMMARY OF THE INVENTION The present invention has been made to solve such inconveniences, and an object of the present invention is to provide a non-volatile memory device capable of easily measuring the floating amount of a band-shaped material without adding mechanical parts. It is to provide a contact transfer device.

A second object of the present invention is to provide a non-contact transfer device capable of simply and inexpensively measuring a distribution of a floating amount of a strip material, in addition to the first invention.

[0007] The object of the invention of claim 3 is that of claim 1 or 2
Another object of the present invention is to provide a non-contact transfer device capable of easily and surely detecting the contact of a belt-shaped material with a pressure receiving surface.

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies, and as a result, have floated and supported a conductive strip-shaped material by gas ejected from an ejection hole provided in a pressure receiving surface of a floater. In non-contact transfer devices, paying attention to the fact that only gas (insulator) exists between the band and the pressure receiving surface, a kind of capacitor is constructed between the pressure receiving surface and the band. By measuring the capacitance of the battery, it has been found that the distance between the pressure-receiving surface and the strip, that is, the floating amount of the strip can be obtained.

According to the first aspect of the present invention, there is provided a non-contact transfer device for a strip-shaped material, which floats a strip-shaped material having conductivity by a gas blown out from a blowing hole provided on a pressure receiving surface of a floater. In a device that supports and transports in a non-contact manner, a conductor is arranged on the pressure receiving surface and this is used as an electrode, and by measuring the capacitance between the electrode and the band, the band of the band is measured. It is characterized by having a flying height measuring means for measuring the flying height from the electrode.

When a voltage is applied between an electrode provided on the pressure receiving surface of the floater and the strip, it is considered that a parallel plate capacitor as shown in FIG. 4 is formed (the floater is curved. If you take out a very small part, it can be regarded as two parallel plates.)

At this time, the area of the electrode is S (m ² ), the dielectric constant of the gas between the electrode and the strip is ε, and the capacitance is C
In the case of (F), the distance t (m) between the electrode and the strip, that is, the floating amount of the strip is expressed by the following equation.

T = εS / C (1) The capacitance C can be obtained by, for example, the bridge method, ε is a physical property value, and S is known, so t can be obtained from the equation (1). .

According to a second aspect of the present invention, there is provided a non-contact transfer device for a belt-shaped material, comprising a plurality of sheet materials formed by laminating an insulating material and a conductor and attached to a pressure receiving surface of the floater. The present invention is characterized in that a capacitance between the electrode and the strip is measured using the conductor of each sheet material as the electrode.

According to a third aspect of the present invention, in the non-contact transfer device for a strip-shaped material, a measured value of the capacitance when the strip-shaped material comes into contact with the electrode is detected and an alarm is output. It is characterized by having an alarm means to perform.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory perspective view for explaining a non-contact transfer device of a steel strip which is an example of an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of FIG. 1, and FIG. It is a block diagram for performing.

This non-contact transfer device is provided with a horizontal floater 1 made of metal, and a slit-shaped air extending in the width direction of a steel strip (conductive strip material) S is provided on a pressure receiving surface 2 of the floater 1. The jet holes 3 are provided apart from each other in the traveling direction of the steel strip S. One end of an air supply pipe (not shown) is connected to the floater 1, and the other end of the supply pipe is connected to an air supply device (not shown) such as a pump, a blower, or a compressor. By supplying air from the air supply device to a chamber (not shown) in the floater 1 through the air supply pipe, air at a predetermined pressure is blown out from the blowout hole 3, whereby the steel strip S is formed in the floater 1. It is configured to float and be supported on the pressure receiving surface 2 and be transferred in a non-contact manner.

On the pressure receiving surface 2, a plurality of sheets (here, nine sheets) formed by laminating an insulating material 4 and a conductor as the electrode 5 are formed.
Sheet material 6 is attached by sticking. The three sheet materials 6 are arranged at substantially equal intervals in the width direction of the steel strip S, and are arranged in three rows at substantially equal intervals in the traveling direction of the steel strip S. By attaching a plurality of sheet materials 6 in which the insulating material 4 and the electrodes 5 are laminated to the pressure receiving surface 2 in this way, each electrode 5 is insulated from the pressure receiving surface 2 and each electrode 5 is mutually insulated. The electrodes 5 of each sheet material 6 are individually connected to a flying height measuring device 7 via switches S _{1 to} S ₉ , and the steel strip S is connected via a transport roll 8 that contacts the steel strip S. It is connected to the flying height measuring device 7.

The flying height measuring device 7 measures a capacitance C (F) between the electrode 5 and the steel strip S by a bridge method when a voltage is applied between the electrode 5 and the steel strip S. The capacitance measuring means 9, the capacitance C (F) measured by the capacitance measuring means 9, the known area S of the electrode 5 and the physical property value of the air between the electrode 5 and the steel strip S A flying height calculating means 10 for calculating the distance between the electrode 5 and the steel strip S from the dielectric constant ε using the above equation (1), that is, a flying height t of the steel strip S, and a display unit for displaying the flying height t And alarm means 13 for outputting an alarm signal to turn on an alarm lamp 12 when the capacitance C (F) measured by the capacitance measuring means 9 exceeds a threshold value.

The electrode 5 and the steel strip S by the capacitance measuring means 9
The capacitance measurement of C (F) between and at the same time measured for all of the electrodes 5, since the mutual interference between the neighboring electrodes 5 occurs, the electrode 5 to be by the switch S ₁ to S ₉
Switch and measure separately. Then, by measuring the capacitance C (F) for each electrode 5, the distribution of the flying height t of the steel strip S (= the inclination of the steel strip) can be obtained.

When the bridge method is used to determine the capacitance C (F), contact (conduction) between the steel strip S and the electrode 5 is performed.
Means that the terminals of the measurement circuit are short-circuited, and therefore, the capacitance measurement value becomes a very large value, and a clear output difference is obtained. Therefore, when a threshold value is provided and the measured value exceeds the threshold value, the alarm means 13 determines that the steel strip S and the electrode 5 are in contact with each other and outputs an alarm signal.

As described above, in this embodiment, the flying height of the steel strip S is measured by measuring the capacitance C (F) between the electrode 5 disposed on the pressure receiving surface 2 of the floater 1 and the steel strip S. Since t is measured, the flying height of the steel strip S can be easily measured without adding a distance measuring sensor as a mechanical component as in the related art.

Further, by disposing a plurality of electrodes 5 on the pressure receiving surface 2 and measuring the capacitance C (F) between each electrode 5 and the steel strip S, the distribution of the flying height of the steel strip S can be determined. Since the distance can be measured, a plurality of distance measurement sensors
Need not be located on the side away from the pressure receiving surface 2
As a result, the flying height distribution of the steel strip S can be measured simply and at low cost.

Furthermore, when the steel strip S is brought into contact with the electrode 5 (conduction), the capacitance measurement value becomes very large and a clear difference in output is obtained. Can be easily and reliably detected.

In the above embodiment, the case where the distribution of the flying height of the steel strip S is measured by disposing a plurality of electrodes 5 on the pressure receiving surface 2 is taken as an example. If you want to know the approximate flying height without using the floater 1,
The floating amount can be more easily measured by regarding the metal (conductor) itself as an electrode.

In the above embodiment, the capacitance C (F) between the electrode 5 and the steel strip S by the capacitance measuring means 9 is used.
Is measured using the bridge method as an example, but the present invention is not limited to this. For example, the capacitance C (F) may be measured using a Q meter or the like.

Further, in the above-described embodiment, the ejection holes 3 are formed in a slit shape. However, the present invention is not limited to this. For example, the pressure receiving surface 2 may be formed of a punching metal or the like and a large number of circular ejection holes may be provided. Alternatively, a rectangular ejection hole may be used instead of the circular shape.

Further, in the above-described embodiment, air is employed as a gas from the viewpoint of cost. However, the present invention is not limited to this, and other gases such as nitrogen may be used as long as the steel strip S can be floated and supported. May be used.

Further, in the above-described embodiment, the case where the present invention is applied to the non-contact transfer device provided with the horizontal floater 1 is taken as an example. However, the present invention is not limited to this, and the present invention is not limited to this. Needless to say, the present invention can be applied to a non-contact transfer device having a floater.

[0029]

As is apparent from the above description, according to the first aspect of the present invention, by measuring the capacitance between the electrode disposed on the pressure receiving surface of the floater and the band, the band of the band is measured. Because the flying height is measured, without adding a distance measuring sensor as a mechanical part as in the past,
The effect that the floating amount of the strip can be easily measured can be obtained.

According to a second aspect of the present invention, in addition to the first aspect, a plurality of electrodes are arranged on the pressure receiving surface and the capacitance between each electrode and the strip is measured to thereby reduce the capacity of the strip. Since the distribution of the flying height can be measured, it is not necessary to arrange a plurality of distance measuring sensors on the side away from the pressure-receiving surface of the strip as in the related art. The effect that measurement can be performed at low cost is obtained.

According to the third aspect of the present invention, in addition to the first or second aspect of the present invention, the capacitance measured value becomes very large at the time of contact between the strip and the electrode, and a clear difference in output is obtained. Therefore, the effect that the contact of the strip with the electrode can be easily and reliably detected is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view for explaining a non-contact transfer device for a steel strip as an example of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a block diagram for explaining a flying height measuring device.

FIG. 4 is an explanatory perspective view for explaining the principle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Floater 2 ... Pressure receiving surface 3 ... Ejection hole 4 ... Insulating material 5 ... Electrode 6 ... Sheet material 7 ... Floating amount measuring device 9 ... Capacitance measuring means 13 ... Alarming means S ... Steel strip (conductive strip-shaped material) )

Claims (3)

[Claims] An apparatus for floatingly supporting and transferring a conductive strip material by a gas blown out from a blowout hole provided on a pressure receiving surface of a floater and transferring the conductive material in a non-contact manner. An electrode, by measuring a capacitance between the electrode and the band-shaped material, comprising a floating amount measuring means for measuring a floating amount of the band-shaped material from the electrode; Non-contact transfer device. 2. A sheet material comprising an insulating material and an electric conductor which are formed on top of each other and attached to a plurality of pressure receiving surfaces of the floater, wherein the electric conductor of each sheet material is used as the electrode, and the electrode and the band-shaped material are used. The non-contact transfer device for a strip-shaped material according to claim 1, wherein a capacitance between the non-contact transfer member and the belt is measured. 3. The belt-shaped member according to claim 1, further comprising an alarm unit that detects a measured value of the capacitance when the band-shaped material contacts the electrode and outputs an alarm. Non-contact transfer device for materials.