JP4818201B2 - Induction heating roller device - Google Patents

Description

  The present invention relates to an induction heat roller device.

In heat treatment rollers such as induction heat generation rollers that have induction coils placed inside the hollow of the roller body and rollers that allow thermal fluid to flow through the hollow of the roller body, a temperature detector is placed within the thickness of the roller and the temperature is detected. In some cases, the surface temperature of the roller is maintained at a predetermined temperature by controlling the current flowing through the induction coil and the temperature of the thermal fluid based on the roller surface temperature detection signal detected by the vessel. In this case, the roller surface temperature detection signal detected by the temperature detector is sent to a temperature control device arranged on the ground side, that is, the fixed side, via a rotary transformer installed in the journal of the roller. Electric power to the temperature detector and the like arranged on the rotating side is supplied from an AC power source arranged on the fixed side via a rotating transformer.
JP 2003-178862 A JP 2004-195888 A JP 2002-093567 A

  However, in the configuration in which the detection signal of the temperature detector is arranged on the rotating side and sent to the temperature control device on the fixed side via the rotating transformer, the transmission accuracy of the rotating transformer can be used even if a temperature detector with high detection accuracy is used. The variation of the roller surface temperature cannot be kept within ± 0.1 ° C.

The problem to be solved by the present invention is to improve the accuracy of the surface temperature of the induction heating roller, simplify the wiring around the induction heating roller, and eliminate such problems.

  The present invention relates to a rotating hollow roller, a temperature detector inserted in the thickness of the roller, and a conversion transmission that is mounted on the roller and converts the detection signal of the temperature detector into a digital signal and wirelessly transmits the digital signal. An induction heating roller device comprising a circuit and an induction coil that is disposed in the hollow of the roller and generates heat to the roller, and a power generation coil that electromagnetically couples with the induction coil to induce power is attached to the roller The main feature is that the power induced by the power generating coil is supplied to the conversion transmission circuit.

  According to the present invention, the detection signal of the temperature detector is converted into a high-precision digital signal on the rotation side of the roller and wirelessly transmitted to the fixed-side temperature control device, so that a highly accurate temperature detection signal can be obtained. As a result, the accuracy of the surface temperature of the induction heating roller can be increased. Moreover, since the electric power generated on the rotation side is supplied to the temperature detector and the conversion transmission circuit arranged on the rotation side using the induction coil, the wiring around the induction heating roller can be greatly simplified. In addition, it does not require the rotary transformer required to send the detection signal of the temperature detector to the temperature control device on the fixed side, or to supply power to the temperature detector arranged on the rotation side or the conversion transmission circuit. The heating roller device is simplified, and the labor required for assembling the induction heating roller device can be reduced. Furthermore, the temperature control device can be independently arranged at an arbitrary position regardless of the arrangement position of the rollers.

  In order to increase the accuracy of the surface temperature of the induction heating roller and simplify the wiring around the induction heating roller, the temperature detector installed within the thickness of the roller and the detection signal of the temperature detector as a digital signal Converted and wirelessly transmitted to a temperature control device arranged outside the roller, and induced by a power generation coil that generates power by electromagnetically coupling with an induction coil to a temperature detector or signal conversion transmission circuit installed on the roller Realized by supplying

Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall structural diagram of the induction heat roller device according to the embodiment, and FIG. 2 is a circuit block diagram of the induction heat roller device shown in FIG. In FIG. 1, 1 is a roller shell, 2 is an induction coil, 3 is an iron core, 4 is a support shaft, 5a and 5b are journals integrally fixed to both ends of the roller shell 1, and 6 is an induction coil 2 and electromagnetic A power generating coil fixed to the inner surface of the roller shell 1 to be coupled, 7 a transmitter fixed to the journal 5b, 8 a temperature detector such as Pt (platinum) 100Ω, 9 a receiver, 10 a temperature controller, 11 is a power control circuit such as a thyristor, and 12 is an AC power source.

The induction coil 2 is wound around a cylindrical iron core 3 and fixed to a support shaft 4. One end of the support shaft 4 is fixed to the machine base, and the other end is supported on the inner surface of the journal 5b via a bearing 12. The journals 5a and 5b are rotatably supported on the machine base via bearings 13a and 13b, respectively, and rotate by rotation of a motor (not shown). The roller shell 1 is formed with a plurality of sealed chambers 1a for enclosing a gas-liquid two-phase heat medium and a hole 1b for inserting a highly accurate temperature detector of Pt (platinum) 100Ω. A temperature detector 6 is inserted into the hole 1b.

When an AC voltage is applied to the induction coil 2 from the AC power source 12 via the power control circuit 11, an alternating magnetic flux is generated, and the alternating magnetic flux flows into the roller shell 1 to induce a current. Joule generates heat. When the roller shell 1 is heated, the heat vaporizes the heat medium enclosed in the sealed chamber 1a, for example, water, moves to a low temperature portion, releases the heat and liquefies. The surface temperature of the roller shell 1 is made uniform by the movement of the latent heat. The alternating magnetic flux generated in the induction coil 2 is linked to the power generation coil 6 to induce a voltage in the power generation coil 6. The voltage induced in the power generation coil 6 is sent to a power storage device 62 composed of an electric double layer condenser, a lithium battery, etc. via a charge protection circuit 61 mounted on the rotating roller side as shown in FIG. 7 is supplied. The power storage device 62 is for supplying power to the transmitter 7 when the roller is stopped and the supply of power to the induction coil 2 is cut off.

The transmitter 7 mounted on the rotating roller side is configured as shown in FIG. That is, in FIG. 2, reference numeral 71 denotes a signal conversion circuit for passing a constant current (1 mA) to the temperature detector 8, amplifying the drop voltage by 50 times, and outputting a change of 0 to 2 V corresponding to a change of 0 to 100 ° C. , 72 is an A / D converter that samples an analog signal output from the signal conversion circuit 71 every 100 mS, converts the output to 16 bits and converts it into a digital signal (numerical signal), and 73 is the temperature detector 8. Since the characteristic is not linear and an error of about 0.3 ° C occurs, the input digital signal is linearized and corrected to an error of about 0.019 ° C. A microcomputer that digitally modulates a signal into a 2.4 GHz current signal, and 74 is a transmission IC that transmits the digitally modulated current signal to the receiving unit 9 on the fixed side via the antenna 75. A.

In the reception unit 9, the signal transmitted from the rotation-side transmission unit 7 is received by the reception IC 92 via the antenna 91, and the received signal is sent to the microcomputer 93. The microcomputer 93 reads a 16-bit digital current signal, sends the digital signal to the D / A converter 94, and converts the analog signal (0 to 100 ° C./4 to 20 mA) converted by the D / A converter 94 into a temperature controller. Send to 10. The temperature controller 10 uses the signal sent from the receiving unit 9 as a temperature detection signal, compares it with the surface temperature of the roller shell 1 set in advance, and sends the deviation to the power control circuit 11. The power applied to the induction coil 2 is adjusted accordingly.

In the induction heating roller device configured as described above, the detection signal of the temperature detector is converted into a digital signal on the rotation side of the roller, and the signal converted into the digital signal is corrected by correcting the error due to the characteristics of the temperature detector. The digital signal transmitted on the fixed side is received and converted into an analog signal, and the analog signal is input to the temperature control device as the temperature detection signal of the temperature detector. A rotating transformer for sending to the fixed side is not required, and a highly accurate temperature detection signal can be obtained in combination with a signal in which an error due to the characteristics of the temperature detector is corrected. Also, since the power supply to be supplied to the temperature detector mounted on the roller rotation side and the conversion transmission circuit is mounted on the roller rotation side and electromagnetically coupled to the induction coil, an electric wire for obtaining a temperature detection signal The cable is omitted, and the complexity around the roller can be avoided.

It is a block diagram which shows the outline of the induction heating roller apparatus which concerns on the Example of this invention. It is a block circuit diagram of the temperature detection circuit of the induction heating roller apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller shell 2 Induction coil 3 Iron core 4 Support shaft 5a, 5b Journal 6 Electric power generation coil 61 Charging protection circuit 62 Power storage device 7 Transmission part 71 Signal conversion circuit 72 A / D converter 73 Microcomputer 74 Transmission IC
75 Antenna 8 Temperature detector 9 Receiver 91 Antenna 92 Receiver IC
93 Microcomputer 94 D / A Converter 10 Temperature Controller 11 Power Control Circuit 12 AC Power Supply

Claims (2)

A rotating hollow roller, a temperature detector inserted in the thickness of the roller, a conversion transmission circuit that is mounted on the roller, converts the detection signal of the temperature detector into a digital signal, and wirelessly transmits the signal, and An induction heating roller device including an induction coil disposed in a hollow of a roller and generating heat from the roller, wherein a power generation coil that electromagnetically couples with the induction coil to induce power is attached to the roller, and the power generation An induction heat roller device, wherein power induced by a coil for use is supplied to the conversion transmission circuit. 2. The induction heat roller device according to claim 1, wherein a storage device for storing electric power induced by the power generation coil is attached to the roller.

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