JP2001349794A - Pressure detection system using signal transmission device and pressure detecting roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure detection system capable of surely transmitting a pressure detection signal outputted in parallel from a pressure detecting roll, the value of which is changed on time, while preventing the influence of noise, and simplifying a signal transmission system. SOLUTION: The output signal of load cells buried in a row in the pressure detecting roll are sampled in the period where the load cells make contact with a strip, or only in the period where the pressure detecting roll has a prescribed rotating angle, and a serial transmission is performed at a transfer rate slower than the sampling rate in the residual period up to the next sampling. The sampling data of the output signals of the load cells is transmitted from the rotating side to the stationary side in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a signal transmission device for transmitting an output signal of a rotation side sensor means to a stationary side, and a pressure detection system for detecting pressure by a pressure detection roll provided with a pressure sensor. Things.

[0002]

2. Description of the Related Art An apparatus for transmitting signals output in parallel is used, for example, as a shape measuring device for shape control in a cold rolling process. This cold rolling step is a cold-rolled steel sheet having excellent dimensional accuracy, a clean and smooth surface, and excellent flatness after pickling the surface of a hot-rolled coil manufactured in a hot rolling factory. This cold-rolled steel sheet is used to manufacture automobiles, electric machines, furniture,
It is used for office supplies, vehicles, architecture, etc.

FIG. 19 shows an example of a rolling mill used in the cold rolling step. The rolling mill shown in FIG. 19 is a quadruple rolling mill provided with backup rolls 152 and 153 above and below a pair of working rolls 150 and 151. In this rolling mill, the strip 154 is sandwiched and pressed by a pair of working rolls 150 and 151.
Is wound in the direction of the arrow with a predetermined tension, whereby a cold-rolled steel sheet having a predetermined size can be obtained.

However, strip 1 after cold rolling
The flatness of 54 depends on the cross-sectional shape of the original sheet and the shape of the gap between the working rolls 150 and 151, that is, the state of the roll crown and the rolling reaction force.

Therefore, in order to obtain the desired flatness, it is necessary to accurately recognize the flatness of the strip 154 after rolling and to provide an appropriate control means. Therefore, conventionally, FIG.
As shown in FIG. 9, a pressure detection roll 155 is provided downstream of the rolling mill in the winding direction of the strip 154, and the pulling direction of the strip 154 is changed downward so as to press against the pressure detection roll 155. Have been. A plurality of load cells are provided in a row on the surface of the pressure detecting roll 155 along the axial direction of the roll. By detecting the pressing force on these load cells, the flatness of the strip 154 is measured. Is performed. The measurement was performed by using the output signal of the load cell as slip ring 1.
The signal is transmitted by 56 and processed by the signal processing circuit 157 to process the output signal, and then displayed on the shape indicator 158. Then, based on the display result, the working rolls 150 and 151 or the backup roll 1
The desired flatness is maintained by bending the rollers 52 and 153, or expanding and contracting the rolls by utilizing the internal pressure or the coolant, or shifting the rolls in the axial direction.

[0006]

However, in the conventional system, both the rotating side and the stationary side of the slip ring 156 require the same number of cables as the number of signals corresponding to the output signals of the plurality of load cells. Processing becomes difficult. Also, to perform highly accurate shape control,
Although it is necessary to transmit the output signal of the load cell with high accuracy, a large-sized drive motor is used in the rolling process, so that the environment is liable to generate noise. In addition, since a cable is provided for each signal, each cable is affected by noise, and errors may occur in many signals.

Further, since a slip ring is used for an analog signal in the signal transmission section, the contact resistance of the slip ring itself affects the signal, and the value of the contact resistance is reduced due to wear or loss. There is a problem that accurate signal transmission cannot be performed due to a change with time.

In particular, in the case of a signal such as an output signal of a load cell, the value of the output signal changes with the rotation of the pressure detecting roll 155 and its peak value needs to be read, erroneous detection due to the inclusion of noise is performed. Must be reliably prevented.

For this purpose, for example, if not only the peak value but also the output signal of the load cell is read and the waveform shape of this output signal is made observable by the shape indicator 158, noise and the original pressure detection signal can be obtained. The peak value can be accurately distinguished, and erroneous detection can be reliably prevented. In the case of a slip ring, an analog signal is used. However, there is a method of sampling a load cell signal and transmitting the digital signal as a digital signal.

However, in order to accurately read the waveform shape of the output signal, it is necessary to increase the number of samplings. However, since a large number of load cells are provided in a line in the axial direction of the roll, the load cells are effective. The number of sampling data during the period of outputting a proper output signal becomes very large. Therefore, in order to transmit such a large amount of data from the rotating side to the stationary side, there is a problem that the configuration of the transmitting and receiving unit becomes complicated.

Therefore, the present invention solves the above problems,
A pressure detection signal that is output in parallel from the pressure detection roll and whose signal value changes with time can be reliably transmitted by preventing the influence of noise. It is an object to provide a pressure detection system that can be simplified.

[0012]

According to a first aspect of the present invention, there is provided a signal transmission apparatus for transmitting a periodic output signal of a sensor provided on a rotating side to a stationary side in a non-contact manner. In the transmission device, sampling means for sampling the output of the sensor means, timing calculation means for calculating the output timing of the sensor means, based on the output timing calculated by the timing calculation means, after the end of sampling, And transmitting means for transmitting the sampled data until the next sampling starts.

According to the signal transmission device of the first aspect, the output signal is periodically obtained from the sensor means provided on the rotating side. Therefore, when a plurality of the sensor units are provided, a signal corresponding to the number of the sensor units is output during the output period of the output signal.

The signal output as described above is sampled by the sampling means based on the output timing calculated by the timing calculation means.

That is, the period during which sampling is performed is as follows:
Since it is limited to within the output period of the output signal of the sensor means, even if the amount of sampled data is large, based on the output timing calculated by the timing calculation means, after sampling is completed, until the next sampling starts. The period is calculated, and during the period until the start of the next sampling, the signal is transmitted from the rotating side to the stationary side by the transmitting means, and is reliably received on the stationary side.

As described above, even when the amount of data to be sampled increases, the sampled data is transmitted during the period from the end of sampling to the start of the next sampling, so that the configuration of the signal transmission system is simplified. Is achieved. In addition, as a result of increasing the amount of data to be sampled, the waveform of the output signal of the sensor means can be accurately reproduced on the stationary side, and the output signal of the sensor means changes over time, causing Even if the signal is easily affected by noise, the influence of the noise is prevented, and the measurement based on the output signal is accurately performed.

According to a second aspect of the present invention, in the signal transmission apparatus according to the first aspect, the transmitting means converts the sampled data from the sampling rate during a period from the end of sampling to the start of the next sampling. Is also a means for transmitting at a slow rate.

According to the signal transmission apparatus of the second aspect, the transmission means transmits the sampled data at a rate lower than the sampling rate during a period from the end of the sampling to the start of the next sampling.
Therefore, even when the sampled data amount is large, a high load is not applied to each means of the transmission system and the reception system.

According to a third aspect of the present invention, there is provided a pressure detecting system using a pressure detecting roll, wherein a pressure sensor is embedded along an axial direction of a roll body and is rotatably provided. And a signal transmission device that transmits an output signal from the pressure sensor of the pressure detection roll to the stationary side in a non-contact manner, wherein the pressure sensor is located at a position in the axial direction of the roll body. Are provided at a plurality of different places, respectively, and are provided in a circumferential direction of the roll body within a predetermined angle range of a rotation angle of the roll body, and the signal transmission device detects a rotation angle of the roll body. Angle detection means, sampling means for sampling the output of the pressure sensor within the predetermined angle range based on the output of the angle detection means, The period until the next sampling start, characterized in that a transmission means for transmitting the sampled data.

According to the pressure detecting system using the pressure detecting roll according to the third aspect, when the pressure detecting roll comes into contact with the detected object while rotating, the pressure sensor embedded in the pressure detecting roll detects the pressure from the detected object. Upon receiving the pressing force, a signal corresponding to the pressing force is output. Therefore, the pressure sensor is provided at a plurality of different positions in the axial direction of the roll body, and is provided within a predetermined angle range of the rotation angle of the roll body in the circumferential direction of the roll body,
Within the predetermined angle range, signals corresponding to the number of the pressure sensors are output.

The signal output as described above is sampled by the sampling means during a period in which the rotation angle of the roll body is detected to be within the predetermined angle range by the angle detection means.

That is, the period during which sampling is performed is:
Since the rotation angle of one rotation of the pressure detection roll is limited to a predetermined angle range, even if the amount of sampled data is large, the transmission unit performs the period from the end of sampling to the start of the next sampling. Are transmitted from the rotating side to the stationary side, and are received by the receiving means on the stationary side.

As described above, even when the amount of data to be sampled is large, the sampled data is transmitted during the period from the end of sampling to the start of the next sampling, so that the configuration of the signal transmission system is simplified. Is achieved. Further, as a result of being able to increase the amount of data to be sampled, the waveform of the output signal of the pressure sensor can be accurately reproduced on the stationary side, and changes with time like the output signal of the pressure sensor, Even if the signal is easily affected by noise, the influence of the noise is prevented, and the measurement based on the output signal of the pressure sensor is accurately performed.

According to a fourth aspect of the present invention, there is provided a pressure detecting system using a pressure detecting roll, wherein the transmitting means comprises:
It is a means for transmitting sampled data at a rate lower than the sampling rate during a period from the end of sampling to the start of the next sampling.

According to the pressure detecting system using the pressure detecting roll according to the fourth aspect, the transmitting means transmits the sampled data at a rate lower than the sampling rate during a period from the end of the sampling to the start of the next sampling. To send. Therefore, even when the sampled data amount is large, a high load is not applied to each means of the transmission system and the reception system.

According to a fifth aspect of the present invention, there is provided a pressure detecting system using a pressure detecting roll, wherein the pressure sensor is provided in a circumferential direction of the roll body. Are arranged in a line so that all of the positions are coincident with each other.

According to the pressure detecting system using the pressure detecting roll according to the fifth aspect, the pressure sensors are arranged in a line so that all the circumferential positions of the rolls coincide with each other. Is performed is limited to an extremely small angle range with respect to the rotation angle of one rotation of the pressure detection roll. This is because the width of the pressure sensor in the circumferential direction of the pressure detecting roll is extremely smaller than the circumferential length of the pressure detecting roll. Therefore, according to the present invention, even when the amount of sampled data is large, the period from the end of sampling to the start of the next sampling is a sufficiently long period. ,
The transmission means ensures transmission from the rotating side to the stationary side.

According to a sixth aspect of the present invention, there is provided a pressure detecting system using a pressure detecting roll, wherein the pressure sensor is provided in a circumferential direction of the roll body. A plurality of sensor rows having the same position are provided, and each sensor row is provided so that the circumferential position of the roll body is different.

According to the pressure detecting system using the pressure detecting roll according to the sixth aspect, the pressure sensor forms a sensor row whose circumferential position of the roll body coincides with each other. The roll body is provided at a plurality of locations so that the circumferential position of the roll body is different. Therefore, according to the present invention, the amount of data to be sampled for all the sensors can be dispersed for each sampling for each sensor row, so that the configuration of the signal transmission system is further simplified.

[0030]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram illustrating a schematic configuration of a shape control system of a cold rolling mill using a signal transmission device according to the present embodiment.

The rolling mill shown in FIG. 1 has a pair of working rolls 1 and 2 provided with a predetermined gap therebetween.
S is provided in the gap between the working rolls 1 and 2.
The strip 5 is rolled into a desired shape by passing the strip 5 of a cold-rolled steel plate such as PCC.

Above and below the working rolls 1 and 2,
Backup rolls 3 and 4 are provided, respectively. The backup rolls 3 and 4 are provided movably in the radial direction toward the working rolls 1 and 2 and in the axial direction of the backup rolls 3 and 4, and adjust the pressing force of the working rolls 1 and 2 against the strip 5 or The bias of the pressing force due to the crown shape of the working rolls 1 and 2 is corrected.

In the quadruple rolling mill of the present embodiment composed of the four rolls as described above, the strip 5 is pressed by a predetermined tension while the strip 5 is pressed and held by the pair of working rolls 1 and 2. By winding in the direction A, a cold-rolled steel sheet having a predetermined shape can be obtained.

However, the strip 5 after cold rolling
The flatness of the working plate 1
In this embodiment, the pressure detection roll 6 is provided downstream of the quadruple rolling mill in the winding direction of the strip 5 because it depends on the shape of the gap 2, that is, the state of the roll crown and the rolling reaction force. The rotation speed of the pressure detection roll 6 is set at 1500 rpm as standard and at 1800 rpm at maximum.

As shown in FIG. 2, 32 load cells 7 are embedded in the surface of the pressure detecting roll 6 as a pressure sensor in a line along the axial direction of the roll. By detecting the pressing force on these load cells 7,
The flatness of the strip 5 can be measured. Then, as shown in FIG. 1, the pulling direction of the strip 5 passing through the gap between the working rolls 1 and 2 is changed in the direction of arrow B so as to be pressed against the pressure detection roll 6.

As shown in FIGS. 1 and 3, a first non-contact transmission section 1 is provided on a rotating shaft 6a of the pressure detecting roll 6.
0, a second non-contact transmission section 11, a rotation-side circuit section 12, a load cell amplifier section 13, and an encoder section 14.

The first contactless transmission section 10 in the present embodiment
As shown in FIG. 3, a first housing member 24a is provided, and a support plate 29a and an electric circuit unit 31a are attached to the first housing member 24a. A second housing member 28a having a cylindrical wall 27a is supported on the first housing member 24a via bearings 25a and 26a, and a support plate 30a is attached to the second housing member 28a. . Further, a first ferrite core coil unit 18a is attached to the support plate 29a, and the first ferrite core coil unit 18a is attached to the second ferrite core coil unit 19a attached to the support plate 30a.
a and are opposed to each other in a non-contact manner.

On the other hand, the second non-contact transmission section 11 provided in parallel with the first non-contact transmission section 10 also includes the first non-contact transmission section 1.
0 has the same configuration. First, as shown in FIG. 3, the first housing member 24
The first housing member 24b is provided with a support plate 29b and an electric circuit unit 31b. A second housing member 28b having a cylindrical wall 27b is supported by the first housing member 24b via bearings 25b and 26b.
A support plate 30b is attached to the housing member 28b. Further, a first ferrite core coil unit 18b is attached to the support plate 29b, and the first ferrite core coil unit 18b is attached to the support plate 30b.
The second ferrite core coil unit 19b is attached to the second ferrite core coil unit 19b in a non-contact manner.

First ferrite core coil unit 18
a, 18b and the second ferrite core coil unit 19
A and 19b each include a power transmission coil housed in an annular ferrite core as described later, and an annular first signal transmission board 113 covering the coil.
a, 113b and second signal transmission substrates 114a, 114
b. With such a configuration, the electric circuit unit 31 is contactlessly contacted from the stationary side to the rotating side.
In addition to supplying power to the load amplifier 13 and the load amplifier unit 13, the clock signal for sampling is serially transmitted from the stationary side to the rotating side.

As described above, the first ferrite core coil units 18a and 18b and the second ferrite core coil units 19a and 19b serve as power transmission couplers for transmitting power by electromotive force generated by mutual induction (electromagnetic induction). In addition to functioning, the signal transmission board functions as a signal transmission unit. Hereinafter, the configurations of the power transmission coupler unit and the signal transmission unit in the present embodiment will be described in detail.

[Coupler for Power Transmission] In this embodiment,
A semi-cylindrical divided ferrite core 110 as shown in FIGS.
a, 29b, 30a, 30b are arranged in a ring on 15 pieces,
By mounting the air-core coil 111 in the central recess 110a of the split ferrite core 110, power supply couplers 115a, 115b, 116a, and 116b are configured. The power transmission coupler unit 115a is provided in the first ferrite core coil unit 18a, and is arranged to face the power transmission coupler unit 116a provided in the second ferrite core coil unit 19a. The power transmission coupler 115b is provided in the first ferrite core coil unit 18b, and is arranged to face the power transmission coupler 116b provided in the second ferrite core coil unit 19b.

The semi-cylindrical split ferrite core 110 used in the present embodiment is generally used as a clamp filter used for shielding a cable. When the ferrite core 110 is used for a clamp filter, FIG. )
As shown in the figure, two semi-cylindrical divided ferrite cores 110 are used in combination. The semi-cylindrical split type ferrite core 110 used for such a clamp filter needs to reliably prevent the leakage of magnetic flux when it is fitted as shown in FIG. High dimensional accuracy. Therefore, as shown in FIG.
Each split type ferrite core 50 is connected to the support plate 29a,
Even if it is arranged in an annular shape on 29b, 30a, 30b,
The height from the support plates 29a, 29b, 30a, 30b can be made uniform. As a result, even when the first ferrite core coil units 18a and 18b and the second ferrite core coil units 19a and 19b are coaxially opposed as shown in FIG. It is possible to keep.

Support plate 29 of split type ferrite core 110
A two-part epoxy adhesive that can be adhered at a low temperature was used for attachment to a, 29b, 30a, and 30b. When an adhesive that bonds at a high temperature is used, cracks or the like may occur in the divided ferrite core 50 that is a fired product during cooling. However, in the present embodiment, the split ferrite core 50 can be bonded at a low temperature. Such cracks and the like do not occur.

The support plates 29a, 29b, 30a, 3
0b is made of non-magnetic stainless steel as described above, so that it does not generate heat even when a change in magnetic flux occurs, and the split type ferrite core 110 is supported on the support plates 29a, 2b.
It does not come off from 9b, 30a, 30b.

As described above, the support plates 29a, 29b, 30
a, split type ferrite core 1 annularly arranged on 30b
In FIG. 10, as shown in FIG. 4A, a central recess 110a penetrating from one end face 110b to the other end face 110c of the split ferrite core 110 is formed. By arranging the split-type ferrite core 110 in an annular shape as shown in FIG. 5, the coil accommodating path including the central recess 110a is formed in an annular shape, and the coil 111 is mounted in the accommodating path. In the present embodiment, the stationary second ferrite core coil unit 19a in the first non-contact transmission unit 10 and the stationary second ferrite core coil unit 19b in the second non-contact transmission unit 11 are set as the primary side. An air core coil 111 of bi-ferrule winding is mounted in the central recess 110a of the split ferrite core 110 constituting the two ferrite core coil units 19a and 19b. Also, 2
The first rotation-side first contactless transmission unit 10 on the secondary side
In the center concave portion 110a of the split ferrite core 110 constituting the ferrite core coil unit 18a and the first ferrite core coil unit 18b on the rotating side in the second non-contact transmission unit 11, a normally wound air core coil 111 is provided.
Attach.

The transmission of power is performed in a non-contact manner based on the principle of mutual induction (electromagnetic induction), but the stationary side is configured to transmit a deformed high-frequency signal based on a pulse-like waveform. On the other hand, on the rotating side, the ripple-like power supply fluctuation is rectified and adjusted to a predetermined power supply voltage by a DC / DC converter or the like.

In this case, as shown in FIG. 6 (A), if the primary and secondary coils are normally wound, the primary side signal is turned on / off, and as shown in FIG.
The power is transmitted at a frequency around z, but in this case, the ratio of the stop time is high, and the transmission efficiency is deteriorated.

Therefore, in this embodiment, FIG.
As shown in (A), the primary side is bi-ferrule wound,
By turning the secondary side into a normal winding, the primary side is alternately turned on / off alternately, as shown in FIG.
As a frequency around kHz, the secondary side synthesizes the frequency to increase the efficiency.

In this embodiment, the split type ferrite core 1
By mounting the air-core coil 111 wound around 30 turns in the ten central recesses 110a, transmission of power by the principle of mutual induction as described above is enabled. The air-core coil 111 is a so-called alcohol fusion wire in which a surface of a coil formed of a copper wire is coated with a resin that melts with methyl alcohol. In the present embodiment, the alcohol fusion wire is wound by a winding device for about 30 turns and then immersed in methyl alcohol. Thereby, the resin coated on the surface of the coil is melted, and the entire air-core coil 111 is solidified. And FIG.
As shown in FIG. 7, the air core coil 111 thus hardened is bonded to the central recess 50a with an epoxy adhesive. Accordingly, the air-core coil 111 presses the entire split ferrite core 110 as shown in FIG. 5, and the split ferrite core 110 is supported by the support plates 29a, 29b, 30.
a, 30b.

[Signal Transmission Section] Next, as shown in FIG. 8, the first signal transmission boards 113a and 113b and the second signal transmission boards 114a and 114b, which constitute the signal transmission section, have a signal transmission pattern 161 and a ground pattern. 162 are separated at intervals of a length d over a plurality of locations.

The printed board 160 is formed by forming a board made of glass epoxy into a ring shape.
The width is slightly smaller than the width of the central recess 110a. Therefore, the first signal transmission boards 113a and 113b and the second signal transmission boards 114a and 114b can be fitted into the central recess 110a of the split ferrite core 110, and in the present embodiment, as shown in FIG. 1st signal transmission board 113a, 113b and 2nd signal transmission board 114
a and 114b are fitted into the central recess 110a of the split ferrite core 110, and are attached so as to cover the coil 111 of the ferrite core coil unit. FIG.
FIG. 4D shows a vertical sectional view taken along line AA ′ of FIG. By adopting such a configuration, the first signal transmission board 113
a, 113b and second signal transmission boards 114a, 114b
It is not necessary to separately secure the arrangement space in the radial direction of the ferrite core coil unit, and the size of the rotary joint can be reduced. FIG.
As shown in (D), the first signal transmission boards 113a, 113
The coil 111 is pressed by the 3b and the second signal transmission boards 114a and 114b, so that the coil 111 can be reliably prevented from falling off.

The shape and size of the printed circuit board 160 are the same for both the first signal transmission boards 113a and 113b and the second signal transmission boards 114a and 114b. Also, the signal transmission pattern 161 and the ground pattern 16
2 may be formed of a low resistivity metal, for example, silver, copper, or aluminum. In the present embodiment, as an example, a pattern formed of a copper foil is used. Further, in the signal transmission pattern 161 and the ground pattern 162, a gap having a width d is provided at four places, and each of the signal transmission pattern 161 and the ground pattern 162 is divided into four arc-shaped patterns. In the signal transmission board on the opposite side, the gap of width d is reduced,
For example, it may be provided at three places.

At the end of each arc-shaped pattern,
As shown in FIG. 8, a through hole 167 that is electrically connected to a land on the back side of the printed circuit board 160 is provided. Further, a chip capacitor 166 is connected to the land on the back side as shown by a dotted line in FIG. Therefore, the respective arc-shaped patterns are connected via the chip capacitor 166, and for a signal of a predetermined frequency,
Functions as a ring-shaped pattern.

As described above, in the present embodiment, the first
The ground pattern 162 and the signal transmission pattern 161 in the signal transmission boards 113a and 113b and the second signal transmission boards 114a and 114b have a DC shape separated by a gap having a length d, but an AC chip capacitor. 166 forms a double ring-shaped structure pattern.

Further, a feeder line extracted from a coaxial cable (not shown) is connected to a feeder point 163 provided in each pattern. Then, the first contactless transmission unit 1
Signals of a predetermined frequency are simultaneously supplied to the power supply points 163 on the signal transmission patterns 161 on the first signal transmission boards 113a and 114b on the transmission side in the zero and second non-contact transmission units 11 via the power supply lines 165. It is configured as follows. The lengths of the power supply lines 65 are equal, and the phases of the signals supplied to the power supply points 163 are aligned. Also, the first signal transmission boards 113a and 113b and the second signal transmission board 1
14a and 114b, as shown in FIG.
The signal transmission patterns 161 and the ground patterns 162 are capacitively coupled to each other via an air layer.

As described above, the signal transmission section of the present embodiment cuts the coaxial cable in a vertical section perpendicular to the central axis,
It is equivalent to each of which is capacitively coupled. Therefore,
A direction perpendicular to both the electric field generated in the direction of the ground pattern 162 orthogonal to the signal transmission pattern 161 and the magnetic field generated so as to surround the signal transmission pattern 161, that is, the first transmission board 113a, 113
The signal transmission is performed by moving the electromagnetic energy in the direction from b to the second signal transmission boards 114a and 114b. That is, in the present embodiment, signal transmission is performed by a method equivalent to that of a coaxial cable, not by signal transmission by an antenna pair, but by a double ring-shaped structure of patterns, simultaneous power supply at multiple points, and capacitive coupling.

In the present embodiment, the first signal transmission boards 113a and 113b and the second signal transmission boards 114a and 114b as described above are placed in the central recess 110a of the split ferrite core 110 in the ferrite core coil unit. Since the fitting is adopted, the size of the rotary joint can be reduced. Thus, even when the power transmission coupler unit and the signal transmission unit are configured to overlap each other, the signal transmission frequency of the first signal transmission substrates 113a and 113b and the second signal transmission substrates 114a and 114b is 300 to 600 MHz. On the other hand, the power transmission frequency of the power transmission coupler unit is 20 kHz to 3 kHz.
Since they are 0 kHz, they do not interfere with each other.

In this embodiment, as shown in FIG. 8, the signal transmission pattern 161 and the ground pattern 16
2 is not a single continuous ring, but a small circular arc region having a length d is removed from a single continuous ring at a plurality of locations and divided into a plurality of circular arc patterns. Each is insulated in a DC manner. Therefore, since the closed circuit through which the circulating current flows as described above is not formed on the signal transmission pattern 161 and the ground pattern 162, the signal transmission pattern 161 is not formed.
Even if the ground pattern 162 is directly affected by the magnetic flux, the generation of the circulating current can be reliably prevented. Further, in the present embodiment, each feed point 163
Is provided at a position between the power supply lines 165, so that one power supply line 165 and an arc-shaped signal transmission pattern 1 in which a power supply point 163 connected to the power supply line 165 is formed.
The closed circuit is prevented from being formed by the 61 or the ground pattern 162, the feeding point 163 adjacent to the feeding point 163, and another feeding line 165 connected to the adjacent feeding point 163. Therefore, even between the power supply line 165 and the pattern, it is possible to prevent the generation of the circulating current due to the change in the magnetic flux. Further, the adjacent arc-shaped patterns are connected to the chip capacitor 1 as shown in FIG.
Since the connection is made by 66, the conductive state is maintained in terms of alternating current, and the signal can be transmitted well.

With this configuration, power is supplied from the stationary side to the rotating side in a non-contact manner with respect to the electric circuit unit 31a and the rotating side circuit section 12, and the sampled output signal of the load cell 7 is transmitted from the rotating side. Serial transmission to the stationary side. The detailed configuration of each circuit unit and signal transmission and power transmission will be described later.

Next, returning to FIG. 3, the rotation-side circuit section 12 provided adjacent to the first non-contact transmission section 10 will be described. The rotation side circuit unit 12 is shown in FIG.
As shown in (A), it has a cylindrical body 12a fitted to the rotating shaft 6a. Connectors 12b are mounted on the body 12a at four locations, and the connectors 12b are configured to be connectable to connectors 12c mounted on a substrate 12d as shown in FIG. 10B.
A side plate 12g is attached to both ends of the body 12a in the axial direction of the rotating shaft 6a. The side plate portion 12g is a plate-like member having a circular outer periphery, and a round hole portion corresponding to the outer periphery of the body portion 12a is formed in the center thereof. A board guide 12f is attached to the side plate portion 12g, and guides both ends of the board 12d to form a connector 12b as shown in FIG.
And the connector 12c are properly connected. Substrate 12
An element such as an IC constituting a sampling circuit, a clock generation circuit, a signal conversion circuit, a power supply conversion circuit, and the like is mounted on d. And the rotation side circuit unit 1 as described above
The outer periphery of 2 is covered with an outer peripheral wall 12e divided into four as shown in FIG. ,

The load cell amplifier 13 has the configuration shown in FIG.
An amplifier 20 as shown in (A) to (C) is housed in a cylindrical housing. The amplifier 20 is configured as shown in FIG.
As shown in FIG. 1, a terminal plate 20c is formed to project from one end, and the terminal plate 20c has a load cell side terminal 20d.
And a circuit unit side terminal 20e. Therefore, the output of the load cell 7 amplified by the amplifier 20 is amplified by connecting the load cell 7 and the load cell side terminal 20d with a cable and further connecting the circuit unit side terminal 20e and the sampling circuit of the rotation side circuit section 12 with a cable. Sampling becomes possible. One independent amplifier circuit is provided in the amplifier 20, and one amplifier 20 can amplify one load cell 7. In the present embodiment, since 32 load cells 7 are used, 32 amplifiers 20 are embedded in the load cell amplifier unit 13.

The hollow shaft 6a is a shaft made of stainless steel, as shown in FIG. 3, a cable 20a for connecting the load cell 7 and the amplifier 20, and a ferrite core coil unit of the second non-contact transmission unit 11 and a rotating circuit. Cable 20 for connecting the clock generation circuit and power supply conversion circuit of section 12
A hollow hole for passing b is formed. The shaft end of the hollow shaft 6a on the pressure detection roll 6 side is fitted to the end of the pressure detection roll 6, and is firmly attached by bolts or the like.
Therefore, when the pressure detection roll 6 is rotationally driven, the hollow shaft 6a is also rotationally driven.

An encoder 14 as an angle detecting means is attached to the end of the hollow shaft 6a as shown in FIG. The encoder 14 includes a rotating part and a fixed part, and the rotating part is fixed to the hollow shaft by mechanical lock. A bearing is mounted between the fixed part and the rotating part 6a, and a bearing is mounted between the fixed part and the rotating shaft 6a. Therefore, the rotating unit is configured to rotate with respect to the fixed unit with the rotation of the pressure detection roll 6, and the opposing portions read the substrate on which the code pattern is drawn and read the code pattern. A head is provided. The read signal from the head is input to the relay unit 15 via the cable 20c connected to the fixed unit as shown in FIG. 3, and is transmitted from the relay unit 15 to the control unit 16. The code pattern is a pattern in which, for example, a scale of a clock, a line segment radially extended from a rotation center axis at a predetermined rotation angle interval is left only in a region near the outer periphery of the substrate, and this pattern is Painted in black on a white background. The head outputs a pulse signal every time the pattern crosses the position of the head, utilizing the difference in the optical characteristics of the pattern with respect to the background. Therefore, by rotating the pressure detection roll 6, the encoder 14 outputs a pulse signal corresponding to the step of the pattern. In the present embodiment, an encoder that outputs 1000 pulse signals by 360-degree rotation is used.

Next, a detailed configuration of each circuit section will be described, and a signal and power transmission system in this embodiment will be described.

FIG. 12 is a block diagram for explaining a signal and power transmission system in this embodiment.

As shown in FIG. 12, an amplifier 20 is embedded in the load cell amplifier section 13, and the number thereof is 32 corresponding to the 32 load cells 7. As shown in FIG. 2, the load cell 7 is embedded in the pressure detection roll 6 so that its surface is exposed on the peripheral surface of the pressure detection roll 6. Upon contact with the strip 5, each load cell 7 receives a load from the strip 5, and FIG.
A peak-shaped waveform signal having a peak as shown in FIG. The amplifier 20 is a circuit that amplifies the amplitude of the signal to a value suitable for sampling, which will be described later, for example, a signal that fluctuates in a range of 0 V to 15 V.

The rotation side circuit section 12 includes a buffer 60
/ D conversion unit 61, RAM 62, first P (parallel) /
S (serial) converter 63A and second P / S converter 63B
, A first DC / DC conversion unit 65, and a rotation side clock unit 6
8, a capture pulse unit 70, a rotation-side control unit 71, and a second DC / DC conversion unit 73. Also, the power supply circuit unit 31a of the first non-contact transmission unit 10 includes a rotation-side first transmission unit 64A, a rotation-side second transmission unit 64B,
A power receiving unit 66 is provided, and the rotation-side first receiving unit 67 is provided in the power supply circuit unit 31 b of the second non-contact transmission unit 11.
, A rotation-side second receiving unit 69 and a second power receiving unit 72.

On the other hand, the stationary-side relay section 15 includes a stationary-side first receiving section 83A and a stationary-side second receiving section 83B as receiving means provided corresponding to the transmitting sections 64A and 64B of the electric circuit unit 31a. And a first S (serial) / P (parallel) converter 87A and a second S / P converter 87B provided corresponding to the receivers 83A and 83B, and the S / P converters 87A and 87B. A first buffer memory unit 88A and a second buffer memory unit 88B provided, and a first logic circuit 89A and a second logic circuit 89B provided corresponding to the buffer memory units 88A and 88B;
A D / A converter 90 for converting each output signal of the logic circuits 89A and 89B into an analog signal;
Filter) 91 and a stationary first power transmitting unit 84 provided corresponding to the rotating first power receiving unit 66 of the electric circuit unit 31a. Further, the stationary-side relay section 15 is provided with a stationary-side first receiving section 67 and a stationary-side first receiving section 67 provided corresponding to the rotating-side second receiving section 69 of the electric circuit unit 31b.
The transmitting unit 80, the stationary second transmitting unit 81, the stationary second power transmitting unit 82 provided corresponding to the rotating second power receiving unit 72 of the electric circuit unit 31b, and the stationary first transmitting unit 80 Clock section 85 for supplying a clock signal to the
And a stationary control unit 86 that outputs a pulse signal to each circuit at a predetermined timing based on an output signal from the encoder 14.

Then, between the electric circuit units 31a and 31b on the rotating side and the relay unit 15 on the stationary side as described above,
First signal transmission substrate 113a and power transmission coupler unit 1
A first ferrite core coil unit 18a on the rotating side provided with the first ferrite core coil unit 15a and a second ferrite core coil unit 19a on the stationary side provided with the second signal transmission board 114a and the power transmission coupler unit 116a are provided. Similarly, a first ferrite core coil unit 18b on the rotating side including a first signal transmission board 113b and a power transmission coupler 115b, and a second signal transmission board 114b and a power transmission coupler 116b are provided. The stationary second ferrite core coil unit 19b is provided.

The stationary side relay panel 15 is connected to a stationary side control panel 16. The control panel 16 has a P (Pea) provided corresponding to the LPF 91 of the relay unit 15.
k) / H (Hold) circuit section 102, gate generation section 100 for generating a gate signal based on the output signal from encoder 14, and gate monitor for monitoring the gate signal output from gate generation section 100 101.

Next, a detailed configuration of each of the above-described units will be described.

First, the buffer 60 is a circuit for delaying the output signal of the load cell 7 amplified by the amplifier 20 by a predetermined period and for surely inputting it to the A / D converter 61.

The A / D converter 61 has a resolution of 12 bits, and performs a conversion operation in synchronization with a sampling clock signal output from the rotation controller 71.

The RAM 62 includes a nonvolatile R such as an SRAM.
AM is used. The RAM 62 also performs a storage operation in synchronization with the sampling clock signal output from the rotation-side control unit 71.

The first P / S converter 63A and the second P / S converter 63B are circuits for converting the sampling data output from the RAM 62 into serial data, and are constituted by a shift register as an example.

In the present embodiment, the buffer 60, the A / D converter 61, and the RAM 62 are provided for each of the 32 cells, similarly to the load cell 7 and the amplifier 20. However, the buffer 60, the A / D converter 61, and the RAM 62 are each divided into 16 pieces.
Two sampling circuits are configured. Then, the sampling data in each system is converted into serial data by two-system converters of the first P / S converter 63A and the second P / S converter 63B.
1a, the rotation-side first transmission unit 64A and the rotation-side second transmission unit 6
4B and 2B.

The first and second rotating side transmission units 64A and 64B modulate the pulse trains output from the first and second P / S converters 63A and 63B by a frequency modulation method. , The signal transmission board 113a in the first ferrite core coil unit 18a on the rotating side
Circuit. In the present embodiment, the frequency of the carrier used for modulation is 300 MHz to 600 M
A frequency of Hz is used, and the rotation-side first transmission unit 64A and the rotation-side second transmission unit 64B are set to have different frequencies corresponding to the above-described two-system sampling circuits.

The sampling clock used for data sampling as described above is created with reference to the encode pulse output from the encoder 14 mounted on the shaft end of the hollow shaft 6a as shown in FIG. The output signal from the encoder 14 is connected to the cable 2 as shown in FIG.
The signal is input to the stationary-side control unit 86 of the stationary-side relay unit 15 and the gate generating unit 100 of the stationary-side control panel 16 via 0c.

The gate generator 100 is a circuit for generating a gate signal based on an encode pulse. The gate signal thus generated can be visually recognized on the gate monitor 101. Therefore, in the actual operation, first, the origin is set with an arbitrary pulse count using the Z-phase signal as the temporary origin. Next, the peak value output from the P / H circuit unit 102 is monitored, the value of the pulse count is changed in an operation unit (not shown) so that the peak value becomes an appropriate value, and the origin is adjusted. Set the output start timing of the sampling clock appropriately.

The change of the pulse count value is configured to be reflected on the stationary control unit 86 in the relay unit 15. While monitoring the signals, a sampling clock signal as shown in FIG. 15 is output at a predetermined timing based on the pulse count value set as described above. The output timing of this signal is determined based on an external clock signal output from the stationary clock unit 85 provided in the relay unit 15.
The stationary side clock unit 85 has a transfer rate of 6 Mbps.
Is a circuit that generates an external clock signal corresponding to
The external clock signal is supplied to the stationary-side control unit 86 and the stationary-side first transmitting unit 80. The stationary side control unit 86
As shown in (2), the sampling signal is output to the stationary-side second transmission unit 81 so that the external clock signal and the sampling signal are synchronized.

The stationary first transmitting section 80 modulates the external clock signal, and the stationary second transmitting section 81 modulates the sampling signal by frequency modulation.
This is a circuit for outputting to the signal transmission board 114b of the stationary second ferrite core coil unit 19b. In the present embodiment, a frequency of 300 MHz to 600 MHz is used as the frequency of the carrier used for modulation, and the stationary first transmitting unit 80 and the stationary second transmitting unit 81 are different so that the respective frequencies do not interfere with each other. The frequency is set.

Next, a method of transmitting data sampled based on the above-described sampling signal from the rotating side to the stationary side will be described.

Since the output of the load cell consumes or supplies a large amount of current and is obtained in a rolling process in which a large motor or the like is used, noise is extremely liable to be generated, and information fluctuation or lack of information due to the noise is caused. Cannot be prevented, and accurate detection and accurate shape control cannot be performed.

Therefore, in the present embodiment, this problem is solved by performing majority processing on the receiving side. Here, the majority decision processing of the present embodiment will be described.

For example, as shown in FIG.
The pulse signal after S conversion is used as a signal to be sampled,
In a configuration in which three pieces of data are sampled at each sampling timing of t1, t2, and t3 and transmitted as serial data, the timing t as shown in FIG.
In the case where noise occurs in 2, the data that should be sampled as low-level data is erroneously sampled as high-level data.

Therefore, in the present embodiment, FIG.
As shown in (B), in each sampling time, sampling is performed a plurality of times at a finer cycle than in the past, converted into serial data, and a signal is transmitted. For example, in the first sampling, timings t11, t12, t1
3 and at timings t21, t22 and t23 in the second sampling, and at timings t31 and t23 in the third sampling.
At each of 32 and t33, data is sampled and serially transmitted as shown in FIG.

Then, on the receiving side, data at each timing t11, t12, t13 is extracted for each data number,
A majority decision is made based on these extracted data. For example, the first sampling data (D1 (t11), D1 (t1) at timings t11, t12, and t13.
2), D1 (t13)) is subjected to majority decision processing. In the example of FIG. 16B, all the data at each timing is at the low level, so that when majority is determined, the first data in the first sampling is determined to be at the low level. In addition, as shown in FIG.
Assuming that noise occurs at timing 2, each timing t21,
The second data at t22 and t23 (D2 (t2
1), D2 (t22), D2 (t23))
(0, 1, 0). However, if you take a majority decision,
Since there are more “0”, the value of the data of the second sampling is determined to be “0”.

As described above, in the present embodiment, since majority processing is performed, even if noise occurs at the time of data sampling, the influence of this noise can be eliminated, and accurate signal detection and Accurate shape control is possible. In addition, by using the majority decision processing, it is possible to effectively remove not only the noise at the time of data sampling but also the noise generated in the signal transmission path. That is, since the serial data sampled and converted as described above is transmitted in a data structure as shown in FIG. 12C, even if noise occurs at the timing tA, for example, the affected data is There is only one data sampled three times.
When the number of data affected by the noise is one, the data can be interpolated by majority processing as described above, and the value of the data is not erroneously read.

In the present embodiment, in order to realize such a majority decision process, a circuit for performing the above-described sampling in the transmitting units 63A and 63B and a shift register configured to shift data a plurality of times are provided. It has.

Then, the sampling circuit performs sampling three times each at a period T as shown in FIG. 16B, and transmits the data while converting it into serial data as needed by a shift register.

Next, the signals output from the transmitters 63A and 63B are transmitted at 6 Mb in the header by the TDMA method.
ps, the first signal transmission substrate 113a and the second signal transmission substrate 11 at a data rate of 3 Mbps.
The signal is transmitted from the rotating side to the stationary side by a non-contact signal transmission unit 4a. The transmitting units 63A and 63B change the carrier frequency to be used, respectively, and the transmitting unit as a whole employs the FDMA system. The setting of the carrier frequency is, for example, 340 MHz, 420 MHz, 500
MHz, 580 MHz or the like.

The received signal is transmitted to the cable 1 shown in FIG.
6a, the receiving unit 83 in the relay unit 15 on the stationary side
A, 83B. The receiving units 83A and 83B are provided corresponding to the rotating transmitting units 63A and 63B, respectively.
The pulse signal is received at a transfer rate of 6 Mbps for the header portion and 3 Mbps for the data portion according to the method. Also, the receiving units 83A and 83B change the carrier frequency to be used, respectively.
The MA system is adopted. The setting of the carrier frequency is set to, for example, 340 MH in accordance with the transmission units 63A and 63B.
A frequency such as z, 420 MHz, 500 MHz, or 580 MHz is used.

The signals received by the receivers 83A and 83B are converted into parallel signals by S / P converters 87A and 87B, and then supplied to buffers 88A and 88B. Then, it is supplied to logic circuits 89A and 89B for performing majority processing.

FIG. 17 shows an example of majority logic circuits 89A and 89B as majority means. The majority logic circuits 89A and 89B include, for example, as shown in FIG.
It is composed of a D circuit and an OR circuit, and the truth table is as shown in FIG. That is, the input data A, B, C
Is a circuit in which the output Q becomes "1" when two or more of them have a value of "1".

Therefore, if the source data is "1", no noise is generated in any of the three samplings, and if all three are received as "1", the majority logic circuit 89A , 89B are all "1", so that the majority logic circuit 8
The outputs of 9A and 89B are "1". If noise occurs during three samplings or during transmission and one of the data is received as “0”, the inputs of the majority logic circuits 89A and 89B are “11”.
0, 101, and 011. Since the number of times of reception as “1” is larger, the majority logic circuit 8
The outputs of 9A and 89B are "1". However, if two data are received as “0” due to noise, the inputs of the majority logic circuits 89A and 89B become “1”.
00 ”,“ 010 ”, and“ 001 ”, and the number of times received as“ 0 ”is larger, so the majority logic circuit 8
The outputs of 9A and 89B are "0".

Therefore, even if any one of the data based on the three samplings is not correctly received, it can be recognized as a correct value by using the majority logic circuit as in the present embodiment. it can.

Thus, the majority logic circuit 89
A and 89B determine the value of the data in each sampling circuit. For example, in the example shown in FIG. 16B, the result of the majority decision processing is determined by timings t11, t21, and t31.
Is recognized as data. Then, such data is restored as a pulse signal. In the present embodiment, since the receiving side is provided with the majority logic circuit, data transmission with high noise resistance and high accuracy is performed.

Further, the majority logic circuits 89A and 89A
The data output from 9B is converted into an analog signal by the D / A converter 90, and a noise component accompanying transmission and reception is removed by the LPF 91.

The signal that has passed through the LPF 91 is input to the P / H circuit 102, where the output waveform of the load cell 7 is checked and the peak value is detected. By obtaining the peak value of the output signal of each load cell in this way, the flatness of the strip 5 in the width direction and the flow direction can be measured. By controlling the rolling mill based on these peak values, The strip 5 having a uniform flatness can be manufactured.

As for power transmission, two systems of power are transmitted: a power supply for the amplifier 20 of the load cell 7 and a power supply to each circuit on the rotating side. Stationary side relay unit 15
The first power transmitting unit 84 provided in the second unit converts the voltage obtained by converting AC 100 V to, for example, DC 28 V into a frequency of about 30 kHz as shown in FIG. Ferrite core coil unit 1
The power is supplied to the power transmission coupler unit 116a provided in the power transmission unit 9a. The power transmission coupler unit 115a provided in the first ferrite core coil unit 18a on the secondary side
, And the received power signal is synthesized by the first power receiving unit 66. Further, the power signal synthesized in this manner is converted into a 5V / 60
The power is converted into a power of W and supplied to each circuit as shown in FIG.

On the other hand, the second power transmission unit 82 provided in the relay unit 15 on the stationary side transmits a voltage obtained by converting AC 100 V to DC 28 V, for example, in FIG. As shown, the frequency is supplied to the power transmission coupler unit 116b provided in the second ferrite core coil unit 19b as a frequency of about 30 kHz. Then, the first ferrite core coil unit 1 on the secondary side
8b is received by the power transmission coupler unit 115b provided in the second power receiving unit 72b.
Is synthesized. Further, the power supply signal synthesized in this way is converted into a 15V / 30W power supply in the DC / DC converter 73, and supplied to the amplifier 20 as shown in FIG.

In this embodiment, the sampling clock and the power supply signal are transmitted from the stationary side to the rotating side, and the sampling signal of the load cell signal is transmitted from the rotating side to the stationary side. Is transmitted.

However, since the load cells 7 in this embodiment are arranged in a line in the longitudinal direction of the pressure detecting roll 6 as shown in FIG. 2, these load cells 7 are connected to the sampling clock as described above. , The number of data to be transmitted becomes extremely large, and it is difficult to perform serial transmission by the above-described method.

Therefore, in the present embodiment, sampling is performed during a predetermined period in which the load cell 7 is in contact with the strip 5, and during the period until the next sampling is performed, the sampled data is sequentially converted in the manner described above. It was configured to transmit. Hereinafter, the transmission method of the load cell signal in the present embodiment will be described in detail.

First, in this embodiment, FIG.
Such a signal is confirmed only during a predetermined period during which the load cell 7 is in contact with the strip 5, and as measured by an actual machine, during the output period of the mountain-shaped waveform, the pressure detection roll 6 makes one rotation. It was confirmed that a period corresponding to 36 degrees out of 360 degrees was reached. In this embodiment, the rotation speed of the pressure detection roll 6 is 1800 rpm at the maximum.
Therefore, the time required for one rotation is at least about 30 ms. At this time, the period during which the signal having the peak waveform is obtained is at least 3 ms.

Therefore, in the present embodiment, all the output signals of the 32 load cells 7 are sampled during the 3 ms period, and the output signals are sampled until the next peak-shaped waveform signal is obtained.
Data transmission is performed at a transfer rate that is practically possible during a period of 7 ms.

In order to reproduce the waveform of an analog signal as shown in FIG. 13A relatively accurately, sampling of about 100 points is required. During the period during which the output signal of the load cell 7 is obtained, as described above, the rotation angle is 36 degrees.
Since the period corresponds to degrees, an encoder capable of obtaining an encoded output of 100 points at 36 degrees is required. Therefore, in the present embodiment, 100 at 360 degrees
The encoder 14 that can obtain 0 points is used, and sampling is performed every 0.36 degrees in rotation angle. Therefore, assuming that the resolution of the A / D converter 61 is 12 bits, the data amount of one load cell 7 is

36 degrees × (1000/360 degrees) × 12 bits = 1200 bits

Is obtained. Therefore, the data amount of 32 load cells 7 is as follows.

[0110] 1200 bits x 32 = 38400 bits

In this embodiment, 16-bit data obtained by adding 4 bits of dummy data to 12 bits, which is the resolution of the A / D converter 61, is used 100 times, that is, RA
Each M62 has a capacity capable of storing 1600 bits of data.

In the present embodiment, since a majority circuit, which will be described later, is used, the sampling data for the 16 load cells is repeatedly transmitted three times. Also,
In the present embodiment, at the beginning of the serial data, FIG.
, A 16-bit header is added. The transfer rate is set to 6 Mbps in the header section and 3 Mbps in the data section. Therefore,
The number of data per sampling is determined by the load cell 1
The following is the result for six pieces.

16 bits / 2 + 16 (bits / piece) × 3
Times x 16 = 776 bits

Here, the reason why 16 bits / 2 is added is that the number of data in the header portion is converted into a transfer rate of 3 Mbps.
This is because it becomes 16 bits / 2.

Accordingly, the total number of data when sampling 100 points for the 16 load cells is as follows.

776 bits × 100 points = 77600 bits

If the transfer rate is 3 Mbps, the transmission time per bit is 0.33 μs, so the time required for transmitting all the data is as follows.

77600 bits × 0.33 μs / 1 bit = 25.6 ms

As described above, if the data is for 16 load cells, the data transmission period shown in FIG.
Transmission becomes possible in 7 ms.

Therefore, in the present embodiment, 32 buffers 60, A / D converters 61, and RAMs 6 are provided in the same manner as the load cells 7 and the amplifiers 20, respectively.
2 is divided into 16 units to form two systems of sampling circuits, and the sampling data in each system is divided into two systems of first P / S converter 63A and second P / S converter 63B. Into the serial data, and further, the rotation-side first transmission unit 6 of the electric circuit unit 31a.
4A and the rotation-side second transmission unit 64B.

As a result, the sampling data shown in FIG. 13B is converted into data on a waveform expanded in the time axis direction as shown in FIG. Transmitted to.

For example, at a certain sampling timing t0, the first load cell 7, the second load cell 7,
And the sampling data of the 16th load cell 7
As shown in FIG. 13B, Id1-0, Id2-0, Id
16-0, and the sampling data of each load cell 7 at the sampling timing t50 is shown in FIG.
As shown in (B), Id1-50, Id2-50, Id16-5
0, and the sampling data of each load cell 7 at the sampling timing t99 is shown in FIG.
As shown in (B), Id1-99, Id2-99, Id16-9
9 is assumed.

In this case, as shown in FIG. 13C, Od1-0, Od2-0, and P / S converters 63A and 63B
And Od16-0. These data Od1-0, Od2-0, and Od16-0 are each 12-bit data, and each data is a P / S converter 63A.
At 63B, it is converted to serial data. Then, the data is transmitted as serial data with a header by the transmission units 64A and 64B. The serial data corresponding to the 12-bit data is transmitted three times.

Hereinafter, the output of sequentially sampled data to the P / S converters 63A and 63B and the transmission units 64A and 64B
Is repeated, and the sampling data Id1-5
When the transmission timing of 0, Id2-50, and Id16-50 comes, data is output to the P / S conversion units 63A and 63B in the order of Od1-50, Od2-50, and Od16-50, respectively, and the transmission units 64A and 64B
4B.

Further, the sampling data Id1-99, Id2-9
9, When the transmission timing of Id16-99, Od1-9
9, Pd-S converter 63A in the order of Od2-99 and Od16-99,
Data is output to 63B, and output from transmission units 64A and 64B.

As described above, although the amount of data to be transmitted is significantly increased, as shown in FIG.
Since the transfer rates to the 3A and 63B and the transmission units 64A and 64B are set to be slower than the sampling, the load cell signals of 32 waveforms as shown in FIG. Can be transmitted as much as possible from the rotating side to the stationary side.

As a result, even when transmitting output signals of as many as 32 load cells, it is not necessary to complicate the configuration of the transmission / reception system, and the apparatus can be simplified. Further, a signal output from the rotating side can be accurately transmitted to the stationary side while preventing the influence of noise, and accurate shape control can be realized.

Further, since all data transmission uses a non-contact transmission path, there is no change in contact resistance as in the case of using a conventional slip ring, and accurate data transmission can be performed for a long period of time. It is possible.

Furthermore, since the data transmission is serial data transmission, the cables can be easily routed without increasing the number of cables used for connecting the rotating side to the relay section or the control panel side.

In the above-described embodiment, an example in which a load cell is used as a pressure sensor has been described. However, the present invention is not limited to such a configuration. For example, a pressure sensor such as a piezoelectric element is used. You can also.

Further, in the above-described embodiment, an example in which an encoder is used as the angle detecting means has been described. However, the present invention is not limited to such a configuration, and for example, a resolver and a cam positioner may be used. You can also.

In the above-described embodiment, the number of load cells is set to 32. However, the present invention is not limited to such a configuration, and may be an appropriate number. For example, the number of load cells can be increased or decreased from 32.

Further, the present invention is not limited to a sensor provided with a pressure sensor as the sensor means, but is widely applicable to a case where output signals of a plurality of sensor means provided in a rotating system are transmitted to a stationary side.

[0134]

According to the signal transmission device of the first aspect,
Based on the output timing calculated by the timing calculation means, a period from the end of sampling to the start of the next sampling is calculated, and during the period until the start of the next sampling, the sampled data is transmitted from the rotating side to the stationary side. Therefore, even when the amount of sampled data is large, transmission can be reliably performed from the rotating side to the stationary side without complicating the configuration of the signal transmission system. Also, as a result of increasing the amount of data to be sampled, the waveform of the output signal of the sensor means can be accurately reproduced on the stationary side, and the output signal of the sensor means changes with time, and the influence of noise Even if the signal is easily affected, the influence of the noise can be prevented, and the measurement based on the output signal can be performed accurately.

According to the signal transmission device of the second aspect, after the sampling is completed, the sampled data is transmitted at a rate lower than the sampling rate during a period from the end of the sampling to the start of the next sampling. However, transmission can be performed without imposing a high load on each means of the transmission system and the reception system.

According to the pressure detecting system using the pressure detecting roll according to the fourth aspect, the sampled data is transmitted during the period from the end of the sampling to the start of the next sampling. Even in the case where the number increases, the configuration of the signal transmission system can be simplified. Further, as a result of being able to increase the amount of data to be sampled, the waveform of the output signal of the pressure sensor can be accurately reproduced on the stationary side, and changes with time like the output signal of the pressure sensor, Even if the signal is easily affected by noise, the influence of the noise can be prevented, and the measurement based on the output signal of the pressure sensor can be performed accurately.

According to the pressure detecting system using the pressure detecting roll according to the fourth aspect, the sampled data is transmitted at a lower rate than the sampling rate during the period from the end of sampling to the start of the next sampling. Even if the data volume is large,
Transmission can be performed without imposing a high load on each means of the transmission system and the reception system.

According to the pressure detecting system using the pressure detecting roll according to the fifth aspect, since the pressure sensors are arranged in a line so that all positions in the circumferential direction of the roll body coincide with each other, the period during which the sampling is performed is limited. The rotation angle is limited to an extremely small angle range for one rotation of the pressure detection roll. Therefore, according to the present invention, even when the amount of sampled data is large, the period from the end of sampling to the start of the next sampling is a sufficiently long period. The transmission means can surely transmit from the rotating side to the stationary side.

According to the pressure detecting system using the pressure detecting roll according to the sixth aspect, the pressure sensor is formed as a sensor row having the same position in the circumferential direction of the roll body, and the sensor row is connected to the roll body of the roll body. It is provided at a plurality of places so that the positions in the circumferential direction are different. Therefore, according to the present invention, the amount of data to be sampled for all sensors can be dispersed for each sampling for each sensor row.
The configuration of the signal transmission system can be further simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment in which a pressure detection system of the present invention is applied to a shape measuring device in a cold rolling process.

FIG. 2 is a perspective view showing a schematic configuration of a pressure detecting roller used in the shape measuring device of FIG.

FIG. 3 is a partial cross-sectional view showing a schematic configuration of a signal transmission unit and other rotary units used in the shape measuring apparatus of FIG. 1;

4A and 4B are diagrams showing a split type ferrite core used in the signal transmission unit of FIG. 3, wherein FIG. 4A is a perspective view showing the split type ferrite core, and FIG. 4B is a view showing the split type ferrite core of FIG. Side view seen from one end face 110b side, (C)
(A) is a side view showing a state in which the air-core coil 111 is mounted in the central recess 110a of the split ferrite core of (A),
FIG. 3A is a side view showing a state in which an air core coil 111 is mounted in a central recess 110a of the split ferrite core of FIG. 1A and a signal transmission board is further provided on the air core coil 111.

FIG. 5 is a plan view showing a configuration of a ferrite core coil unit constituting a power supply coupler unit in the signal transmission unit of FIG. 3;

FIG. 6A is a diagram showing an example of a coil configuration in a transformer using electromagnetic induction as a comparative example, and FIG.
FIG. 4 is a diagram showing a current waveform in the coil configuration of FIG.

7A is a diagram illustrating an example of a coil configuration in a transformer using electromagnetic induction applied to a power supply coupler unit of the signal transmission unit in FIG. 3, and FIG. 7B is a current waveform in the coil configuration in FIG. FIG.

FIG. 8 is a plan view illustrating a schematic configuration of a signal transmission board used in the signal transmission unit of FIG. 3;

FIG. 9 is a plan view illustrating a schematic configuration of the signal transmission unit of FIG. 3;

10A and 10B are diagrams illustrating a schematic configuration of a rotation-side circuit unit in the rotation-side unit in FIG. 3, wherein FIG. 10A is a front view and FIG. 10B is a perspective view illustrating a substrate used for the rotation-side circuit unit.

11A and 11B are diagrams showing a configuration of an amplifier used in the rotation-side unit in FIG. 3, wherein FIG. 11A is a front view, FIG. 11B is a side view, and FIG. 11C is a bottom view.

FIG. 12 is a block diagram showing an electrical configuration of a signal transmission system used in the shape measuring device of FIG. 1;

13A is a diagram showing a signal waveform of a load cell amplifier used in the shape measuring device of FIG. 1, FIG. 13B is a diagram schematically showing a sampling state of the signal waveform, and FIG. FIG. 7 is a diagram for explaining a method of outputting sampling data.

FIG. 14 is a diagram for explaining a data transmission method in the shape measuring apparatus of FIG. 1;

FIG. 15 is a diagram showing a relationship between a sampling signal and an external clock signal in the shape measuring device of FIG.

16A and 16B are timing charts for explaining majority processing used in a signal transmission system of the shape measuring apparatus in FIG. 1, wherein FIG. 16A shows a pulse signal to be sampled, and FIG. FIG. 3C is a diagram showing the transmission order of sampled data.

FIG. 17 is a circuit diagram illustrating an example of a majority circuit of a receiving unit used in the shape measuring apparatus of FIG. 1;

FIG. 18 is a diagram showing a truth table of the majority circuit of FIG. 17;

FIG. 19 is a perspective view showing a schematic configuration of a conventional shape measuring device.

[Explanation of symbols]

 1, 2, working roll 3, 4, backup roll 5, strip 6, pressure detection roll 6a, hollow shaft 7, load cell 10, first non-contact transmission section 11, second non-contact transmission section 12, rotating circuit section 13 ... Load cell amplifier unit 14 ... Encoder 15 ... Relay unit 18a, 18b ... First ferrite core coil unit 19a, 19b ... Second ferrite core coil unit 20 ... Amplifier 60 ... Buffer 61 ... A / D conversion unit 62 ... RAM 63A ... 1P / S conversion section 63B second P / S conversion section 64A rotation-side first transmission section 64B rotation-side second transmission section 65 first DC / DC conversion section 66 first power receiving section 67 rotation-side first reception Unit 68 Rotation side clock unit 69 Rotation side second reception unit 70 Capture pulse unit 71 Rotation side control unit 72 Second power reception unit 73 Second DC DC converter 80: stationary first transmitter 81: stationary second transmitter 82: stationary second power transmitter 83A stationary first receiver 83B stationary second receiver 84: stationary first power transmitter Unit 85: stationary clock unit 86: stationary control unit 87A: first S / P conversion unit 87B: second S / P conversion unit 88A: first buffer memory unit 88B: second buffer memory unit 89A: first logic circuit 89B ... Second logic circuit 90 ... D / A converter 91 ... LPF

Claims (6)

[Claims] 1. A signal transmission device for non-contact transmission of a periodic output signal of a sensor means provided on a rotating side to a stationary side, wherein a sampling means for sampling an output of said sensor means, Timing calculation means for calculating the output timing, based on the output timing calculated by the timing calculation means, after the end of sampling, during the period until the start of the next sampling, comprising a transmission means for transmitting the sampled data, A signal transmission device characterized by the above-mentioned. 2. The transmitting means, after the end of sampling,
2. The signal transmission device according to claim 1, wherein the signal transmission device transmits the sampled data at a rate lower than the sampling rate during a period until the next sampling starts. 3. A pressure sensor buried along the axial direction of the roll body and rotatably provided, and non-contact transmission of an output signal from the pressure sensor of the pressure detection roll to a stationary side. A pressure transmission system comprising a signal transmission device, wherein the pressure sensor is provided at a plurality of different locations in the axial direction of the roll body, respectively, and in the circumferential direction of the roll body of the roll body The signal transmission device is provided within a predetermined angle range of a rotation angle, and the signal transmission device includes an angle detection unit that detects a rotation angle of the roll body, and the pressure within the predetermined angle range based on an output of the angle detection unit. Sampling means for sampling the output of the sensor, and transmission means for transmitting the sampled data during a period from the end of sampling to the start of the next sampling. The pressure detection system using equipped with a pressure sensing roll, characterized in that. 4. The transmitting means, after the end of sampling,
4. The pressure detecting system according to claim 3, wherein the transmitting means transmits the sampled data at a rate lower than the sampling rate until the next sampling starts. 5. The pressure detecting device according to claim 3, wherein the pressure sensors are provided in a line so that all positions in the circumferential direction of the roll body coincide with each other. system. 6. The pressure sensor is provided with a plurality of sensor rows in which the circumferential position of the roll body coincides with each other, and each sensor row is provided so that the circumferential position of the roll body is different. A pressure detection system using the pressure detection roll according to claim 3 or 4.