JP4785723B2 - Heat detection roller temperature detection signal output device - Google Patents

Description

  The present invention relates to a heat detection roller temperature detection signal output device that outputs a temperature detection signal detected on the rotation side of a roller on the stationary side, and more particularly to a pressure-proof explosion-proof mounting structure of a rotary transformer.

  A fluid is passed through the roller, and a resin film that contacts the surface of the roller is heat-treated at a predetermined temperature. FIG. 3 shows an outline of an example of a heat treatment roller apparatus for performing such heat treatment. In FIG. 3, 1 is a roll shell constituting a roller body, and 2 is rotated by a motor (not shown) to rotate the roll shell. Rotation drive shaft, 3 is a core, 4 is a rotary joint, 5 is an oil storage tank, 6 is oil (heat medium fluid), 7 is a heat exchanger (heating or cooling), 8 is a pump, 9 is the temperature of the heat medium fluid 10 is a temperature control device, 11 is a power control circuit, 12 is a heater in this example, and 13 is a processed product such as a resin film that abuts and passes through the roll shell.

The roll shell 1 has a cylindrical shape, and a core 3 is disposed inside the hollow shell, and a heat medium passage 3 a is formed through the center of the core 3. The heat medium flow path 3 a is connected to the inlet of the rotary joint 4 through the rotary drive shaft 2, and is formed between the inner peripheral wall of the roll shell 1 and the outer peripheral wall of the core 3. Is connected to the outlet of the rotary joint 4 through the rotary drive shaft 2.

That is, the heat transfer fluid 6 in the oil storage tank 5 passes through the heat exchanger 7 and is heated or cooled to a predetermined temperature, and the heat transfer fluid 6 is sent into the roll shell 1 by the pump 8, and the heat transfer passage 3a. And 1a are discharged and discharged to the oil storage tank 5. The temperature sensor 9 is provided on the output side of the heat exchanger 7, and the detected temperature signal is sent to the temperature control device 10. The temperature control device 10 is preliminarily input with a set temperature S for setting the temperature of the flowing heat transfer fluid 6, and compares the set temperature S with the input temperature signal detected by the temperature sensor 9, and its deviation. Is sent to the power control circuit 11 including a thyristor. The power control circuit 11 supplies power corresponding to the control signal to the heater 12, and the heater 12 generates heat according to the power to heat or cool the heat transfer fluid 6 to the set temperature S.

In the heat treatment roller apparatus as described above, the electrical system is simply placed outside the environment that requires explosion-proof, and can be easily installed in an environment that requires explosion-proofing, and the processed material is heated or cooled in that environment. can do. However, when the electric system is arranged outside the environment that requires explosion-proofing, there is a problem that the above temperature control cannot quickly cope with the fluctuation of the surface temperature of the roll shell 1.

On the other hand, in the above temperature control, the rise of the surface temperature of the roll shell 1 is slow with respect to the rise of the temperature of the heat transfer fluid 6 initially, and the surface temperature of the roll shell 1 is increased to the vicinity of the set temperature S. In order to improve the long time, a temperature sensor is arranged in the thickness of the roll shell 1 to detect the surface temperature of the roll shell 1, and the detection signal is sent to the stationary side via the rotary transformer. Some of them are transmitted and compared with the temperature of the heat transfer fluid, and the temperature is controlled so that the deviation maintains a predetermined value.
JP 2004-195888 A

However, in general, in a rotary transformer, as shown in FIG. 4, a rotor substrate 14 on which a coil or the like is mounted is fixed to the end of the rotary shaft 2, and the temperature placed on the rotor substrate within the thickness of the roll shell 1. Fix the lead wire from the sensor. In addition, a stator substrate 15 on which a coil facing the coil mounted on the rotor substrate is mounted has a cylindrical shape in which one end is closed with a flange 17a standing upright at the end of the cylindrical bearing housing 17. The support cylinder 16 is fixed inside the support cylinder 16, and is fitted and fixed to the rotary shaft 2 via a bearing 18 between the hollow inner surface of the bearing housing 17 and the outer peripheral surface of the rotary shaft 2. The wires led out from the stator substrate 15 are drawn to the outside via a connector 19 attached to the flange 17a and connected to a control device or the like installed on the stationary side, and the electrical system is exposed to the external environment. It has become.

For this purpose, a temperature sensor is arranged in the thickness of the roll shell 1 that rotates in this way, and a heat treatment roller that transmits a detection signal of the temperature sensor to a control device installed on the stationary side via a rotary transformer. Although this temperature detection signal output device is convenient to respond quickly to fluctuations in the surface temperature of the roll shell 1, there is a problem that it cannot be used in an environment that requires explosion-proofing.

  The present invention provides a temperature detection signal output device for a heat treatment roller in which a temperature sensor is disposed within the thickness of a rotating roll shell and a detection signal of the temperature sensor is transmitted to a control device installed on a stationary side via a rotary transformer. Can be installed in an environment that requires explosion-proofing, and it is possible to respond quickly to fluctuations in the surface temperature of the heat treatment roller used in that environment, thus eliminating such problems. It is in.

  According to the present invention, a detection signal of a temperature sensor arranged in the surface side wall thickness of the roller through which the heat transfer fluid flows is transmitted through a rotor substrate attached to the rotating shaft of the roller and a bearing on the rotating shaft of the roller. In the temperature detection signal output device of the heat treatment roller that outputs to the stationary side through a rotary transformer composed of a stator substrate fixed to the attached cylindrical case, the opening end of one end of the cylindrical case has a stationary side A flange that has a through hole for mounting a cable gland for connecting an output cable, and is fixed at the end of a cylindrical bearing housing through which the rotation shaft of the roller is inserted with a gap having a large fluid resistance, is fixed. At the opening end of the roller, the cylindrical case and the outer peripheral protrusion are formed by a circular plate having a protrusion protruding in the axial direction on the outer periphery of the roller and a cylindrical protrusion through which the conducting wire is inserted. A sleeve having a large clearance between the temperature sensor, and a sleeve having a built-in conductor extending from the temperature sensor in a through-hole of a cylindrical projection through which the conductor of the disk is inserted. The main feature is that it is inserted between the inner surface of the through hole of the cylindrical projection with a gap having a large fluid resistance.

In the present invention, since the inside of the cylindrical case of the rotary transformer is communicated with the outside only by a gap having a large fluid resistance, even if an electrical short circuit occurs within the case and a spark is generated, the outside does not spread outside. In addition to preventing environmental explosions, it is possible to respond quickly to fluctuations in the surface temperature of a heat treatment roller installed in an environment that requires explosion protection. Also, the opening at one end of the cylindrical case is closed by a flange standing upright at the end of the cylindrical bearing housing through which the roller rotation shaft is inserted with a gap having a large fluid resistance, and the opening at the other end is Since it is closed by a disc formed on the rotating shaft of the roller and having a cylindrical projection that passes through a projection extending in the axial direction on the outer periphery and a conducting wire, a gap with a large fluid resistance is inserted through the rotating shaft. The length of the projection, the length of the projection, and the length of the through hole of the cylindrical projection can be ensured, and the entire case surrounding the rotary transformer can be formed thin and lightweight.

A temperature sensor is placed within the thickness of the rotating roll shell, and the temperature detection signal output device of the heat treatment roller that transmits the detection signal of the temperature sensor to the control device installed on the stationary side via the rotary transformer is explosion-proof. A fixing that covers the electrical components of the rotary transformer, so that it can be installed in the required environment and can quickly respond to fluctuations in the surface temperature of the heat treatment roller used in that environment. This was realized by covering the opening on one side of the cylindrical case located on the side with a disk formed on the rotating shaft.

  An embodiment of the present invention will be described below with reference to FIG. FIG. 1A is a half cross-sectional view showing a schematic configuration of a rotary transformer section, and FIG. 1B is an enlarged cross-sectional view of a lead-in section of the rotary transformer section shown in FIG. The configuration of the heat treatment roller is the same as that of the heat treatment roller shown in FIG. 3, and the configuration is omitted in FIG. Further, the same or corresponding parts as those of the conventional rotary transformer shown in FIG.

1 (a) and 1 (b), 2a is a disc formed on a rotating shaft 2, and is formed with a projection 2b standing in the axial direction on the outer periphery and a cylindrical projection 2c through which a conducting wire is inserted, and 20 is for a rotor A cylindrical case that accommodates the substrate 14 and the stator substrate 15, 21 is a flange that stands upright at the end of a cylindrical bearing housing 21a through which the rotating shaft 2 of the roller is inserted, and 22 is an explosion-proof connection that connects the stationary output cable w1. A cable gland having a structure, 24 is a sleeve having a flange 24a containing a lead wire w2 connected to a temperature sensor on the rotation side, and 25 and 26 are bearings.

The opening at one end of the cylindrical case 20 is closed by a flange 21 and the opening at the other end is opened, and the stator substrate 15 is fixed to the inner peripheral surface thereof. The disc 21 is provided with a cable gland 22 for connecting the lead wire of the stationary output cable w1 and the lead wire from the stator substrate 15. The inner diameter of the bearing housing 21a is slightly larger than the outer diameter of the rotating shaft 2 (0.4 mm in this example), and the length thereof is a predetermined length (40 mm in this example).

A circular plate 2a having a diameter (0.4 mm in this example) slightly smaller than the inner diameter of the opening side end portion of the cylindrical case 20 is integrally formed on the rotating shaft 2 of the roller, and the outer periphery of the circular plate 2a. A projection 2b is formed which stands up in a predetermined distance (40 mm in this example) in the axial direction. In addition, a cylindrical projection 2 c that passes through the sleeve 24 is formed on the surface of the disk 2 a, and the diameter of the through hole of the cylindrical projection 2 c is slightly larger than the outer diameter of the sleeve 24. The sleeve 24 connects a conductive wire extending from a temperature sensor inserted in a hole near the surface of the roll shell of the roller body and a conductive wire extending from the rotor substrate 14.

The temperature sensor is housed in a protective tube made of 100Ω platinum and filled with magnesium oxide or the like, and the lead wires extending from the temperature sensor, for example, the power supply line and the signal transmission line, are housed in a tube extending to the sleeve 24 connected to the protective tube. Therefore, the temperature sensor and the lead wire extending from the temperature sensor are not exposed to the outside air while being bare.

The sleeve 24 inserted into the through-hole of the cylindrical protrusion 2c is fixed by screwing with the flange 24a of the sleeve 24 in close contact with the surface of the disk 2a. At this time, a slight gap is formed between the inner peripheral surface of the through hole of the cylindrical projection 2c and the outer peripheral surface of the sleeve 24, but the length from the screw tightening position to the end of the cylindrical portion is increased. The fluid resistance due to this gap is extremely large.

In this example, the cylindrical projection 2c inserted through the sleeve 24 protrudes only on the inner surface of the disc 2a (in the same direction as the projection 2b). However, as shown in 2d of FIG. 2a may be protruded to the outside of the surface, and as shown in FIG. 2 (b), a cylindrical metal fitting 23 having a flange 23a formed separately in a through hole formed on the surface of the disk 2a is used. The flange 23a of the cylindrical metal fitting 23 may be fitted on the inner peripheral surface of the hole in close contact with the roller side. In this case, the length of the protrusion 2c protruding inward of the cylindrical case 20 is shortened by the thickness of the flange 23a, and conversely, it occurs between the inner surface of the through hole of the cylindrical metal fitting 23 and the outer surface of the sleeve 24. The distance of a slight gap can be increased, and the fluid resistance due to this gap can be further increased.

A cylindrical case 20 having a bearing 26 fixed to the rotary shaft 2, closed by a flange 21, and a stator substrate 15 fixed thereto is fitted into the rotary shaft 2 along the bearing 26, and the opening side end of the cylindrical case 20 is fitted. The inner peripheral surface is opposed to the outer peripheral surface of the protrusion 2b of the disk 2a, and the bearing 25 is inserted for assembly. In this state, the gap d1 between the outer peripheral surface of the protrusion 2b and the inner peripheral surface of the cylindrical case 20 is 0.2 mm and the length is 40 mm, and the fluid resistance due to the gap is extremely large. Further, the gap d2 between the inner peripheral surface of the bearing housing 21a and the outer peripheral surface of the rotary shaft 2 is 0.2 mm and the length is 40 mm, and the fluid resistance due to the gap is extremely large. As a result, the inside of the rotary transformer is shut off from the outside, and an electrical short circuit does not occur when exposed to the external environment. In general, a gap having a length of 40 mm and an interval of 0.2 mm or less is considered to be suitable for an explosion-proof structure.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows schematic structure of the temperature detection signal output device of the heat processing roller which concerns on the Example of this invention, (a) is a half sectional view of a rotation transformer part, (b) is conducting wire of the rotation transformer part shown to (a). It is an expanded sectional view of a drawing-in part. It is an expanded sectional view of the conducting wire drawing-in part of the other rotation transformer part concerning the example of the present invention. It is a block diagram of the heat processing roller apparatus. It is a half sectional view of a conventional rotary transformer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll shell 2 Rotating shaft 2a Disc 2b Projection 2c Cylindrical projection 14 Rotor substrate 15 Stator substrate 20 Tubular case 21 Flange 21a Bearing housing 22 Cable gland 23 Cylindrical metal fitting 23a Flange 24 Sleeve

Claims (2)

A cylindrical shape in which a detection signal of a temperature sensor disposed within the surface side wall thickness of a roller through which a heat transfer fluid flows is attached to a rotor substrate attached to the rotation shaft of the roller and a bearing to the rotation shaft of the roller In the temperature detection signal output device for the heat treatment roller that outputs to the stationary side through a rotary transformer made of a stator substrate fixed to the case, a stationary output cable is connected to the open end of one end of the cylindrical case A flange that stands upright at the end of a cylindrical bearing housing that has a through hole for mounting a cable gland and that passes through the rotation shaft of the roller across a gap having a large fluid resistance, and is fixed to the opening end of the other end. Is a disk formed on the rotating shaft of the roller and having a projection extending in the axial direction around the outer periphery and a cylindrical projection through which the conducting wire is inserted, and a fluid between the cylindrical case and the outer peripheral projection. A sleeve having a large clearance and fitted therein, and a sleeve containing a lead wire extending from the temperature sensor in a through hole of a cylindrical protrusion through which the lead wire of the disk is inserted, and an outer surface of the sleeve and the cylindrical shape An apparatus for outputting a temperature detection signal of a heat treatment roller, wherein a gap having a large fluid resistance is inserted between an inner surface of a through-hole of the protrusion and spaced apart. 2. The temperature detection signal output device for a heat treatment roller according to claim 1, wherein a cylindrical projection for inserting the conducting wire of the disk is formed integrally with the disk and protrudes into the case.

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