JP4963038B2 - Induction heating roller device - Google Patents

Description

  The present invention relates to an induction heat roller device.

  In this type of device, journals are integrally connected to both ends of the roller, and the journals at both ends are rotatably supported by bearings on bearings via bearings, respectively. A structure in which an induction heating mechanism comprising an induction coil wound around an iron core for induction heating is arranged and supported by support rods passing through journals on both sides is already well known.

  FIGS. 9 (a) and 9 (b) show an example of the structure of such an induction heating roller device. 1 is a roller shell made of a magnetic material, 2 and 3 are integrally fastened to both ends of the roller shell 1. FIG. A journal, which is rotatably supported by both bearings 5 and 6 by means of bearings 5 and 6 arranged between its outer periphery and the machine base 4. 7 is an induction heating mechanism comprising an induction coil wound around an iron core, and is fixed to a support rod 8 passing through the journals 2 and 3 on both sides.

The support rod 8 has a hollow with one end edge closed, and on the closed end side, as shown in an enlarged view in FIG. A plurality of communicating pores 9 are formed in the circumferential direction and the longitudinal direction, and the other end portion which is an opening communicating with the inside of the hollow is led out from the journal 3 and fixedly supported on the machine base 4. Then, compressed air is supplied from the opening, and the closed end portion ejected from the pore 9 is supported by air pressure on the inner peripheral surface of the journal 2 through the space. That is, one end of the support rod 8 is a hydrostatic gas bearing. 10 is supported on the inner peripheral surface of the journal 2 through a space. Further, the journal 2 is formed with a hole 11 for discharging air ejected from the pore 9 of the support rod 8, and a motor 12 is directly connected to the end edge thereof.
Japanese Patent Publication No. 6-78767

  In this way, if the support rod that supports the induction heating mechanism arranged inside the roller shell is supported by the static pressure gas bearing through the space on the inner peripheral surface of the journal, it is not a mechanical bearing such as a slide bearing or a rolling bearing. The advantage is that the service life of the bearings can be extended, the work of attaching and detaching for maintenance, inspection and replacement of the bearings is not necessary, and the workability in assembly and disassembly of the rollers is greatly improved by the absence of mechanical bearings. There is.

However, even in the case of a static pressure gas bearing, as with a mechanical bearing such as a rolling bearing or a sliding bearing, the vibration accompanying the rotation of the roller is transmitted to the support rod, and the induction heating mechanism is vibrated. When the frequency becomes the primary natural frequency of the support rod to which the induction heat generating mechanism is fixed, it resonates and becomes a large amplitude vibration. For example, when the outer diameter of the roller is 400 mm and the roller surface length is 3800 mm, the mechanical natural vibration in the first simple support mode of the internal induction heating mechanism when the rotational peripheral speed of the roller reaches 600 m / min (rotation speed: about 480 RPM). Resonates with each other to produce large amplitude vibration. This vibration is transmitted to the support rod, and a force due to the vibration is applied to the static pressure gas bearing. The static pressure gas bearing cannot resist the force and loses its function as a bearing, and there is a problem that the induction coil of the induction heating mechanism contacts the inner peripheral surface of the roller shell and is damaged.

SUMMARY OF THE INVENTION The problem to be solved by the invention is that vibration of the induction heating mechanism can be suppressed even if the induction heating mechanism disposed inside the roller shell is supported on the inner peripheral surface of the journal via a bearing. The point is to solve the problem.

According to the present invention, an outer periphery of a hollow journal attached to both sides of a roller is rotatably supported on a machine base via bearings on both sides thereof, and an induction heating mechanism for causing the roller to generate induction heat is provided on the both sides. In the induction heating roller device, which is fixed to a support rod that is inserted through the hollow of the journal and disposed inside the roller, and at least one end of the support rod is supported in the journal via a bearing. the inner peripheral surface of the journal located outside the bearing for supporting the rod and the magnetic material, the outer peripheral surface of the front Symbol the support rods to the magnetic body and opposed, with arranging a plurality of electromagnets along the circumferential direction, before magnetic whose serial position sensor for detecting the position from the inner circumferential surface of the journal in the vicinity of the electromagnets provided, wherein each electromagnet is emitted based on a detection signal of the position sensor The individually controlled, as a main characterized in that by suppressing the vibration transmitted to the support rod by the rotation of the roller.

In the present invention, the magnetic force of the plurality of electromagnets arranged on the outer peripheral surface of the support rod is individually adjusted according to the displacement between the inner peripheral surface of the journal and the outer peripheral surface of the support rod facing the inner peripheral surface. The distance between the inner peripheral surface of the support rod and the outer peripheral surface of the support rod facing the inner peripheral surface is always kept constant. As a result, vibration of the induction heating mechanism fixed to the support rod is suppressed, damage to the induction coil due to resonance and damage to the bearing supporting the support rod can be prevented, and it is not necessary to limit the number of rotations of the roller.

For the purpose of suppressing vibration of the induction heating mechanism even if the induction heating mechanism arranged inside the roller shell is supported on the inner peripheral surface of the journal via a bearing, the inner peripheral surface of the journal is made of a magnetic material. A plurality of electromagnets are arranged along the circumferential direction on the outer peripheral surface of the support rod facing the magnetic body, and the magnetic force of each electromagnet is supported on the inner peripheral surface of the journal and the inner peripheral surface. This was realized by individually adjusting according to the displacement with the outer peripheral surface of the rod.

FIG. 1 is a cross-sectional view (a) and a front view (b) of one end of an induction heat roller device according to an embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the conventional induction heating roller apparatus shown in FIG. 9, or respond | corresponds, and the description about the whole structure of an induction heating roller apparatus is abbreviate | omitted. In FIG. 1, 2 is a journal having a hollow inner peripheral surface integrally fastened to one end of a roller shell as a magnetic material, 8 is a support rod for supporting an induction heating mechanism disposed in the roller shell, 10 is a static pressure gas bearing, 13a to 13d are electromagnets, and 14a to 14d (see FIG. 5 for 14c and 14d) are position sensors. As in the conventional induction heating roller device shown in FIG. 9, the support rod 8 is inserted through a space on the inner peripheral surface of the journal 2 via a static pressure gas bearing 10 that ejects compressed air supplied into the hollow from the pores 9. It is supported.

The electromagnets 13a to 13d are composed of four homopolar type electromagnets (may be heteropolar type electromagnets), and the electromagnets 13a, 13b, 13c, and 13d are outer peripheral surfaces of the support rod 8 that extends from the static pressure gas bearing 10 to the ends. In addition, as shown in FIG. 1 (b) along the circumferential direction, there are four places, up and down, left and right, that is, an electromagnet 13a at the upper position, an electromagnet 13b at the lower position, an electromagnet 13c at the left position, and an electromagnet 13d at the right position. The magnetic poles of the electromagnets 13a, 13b, 13c, and 13d are opposed to the inner peripheral surface of the journal 2 with a space therebetween.

The coils of the electromagnets 13a, 13b, 13c, and 13d are connected to controllable power amplifiers A1, A2, A3, and A4 as shown in FIG. That is, the coil of the electromagnet 13a is connected to the power amplifier A1, the coil of the electromagnet 13b is connected to the power amplifier A2, the coil of the electromagnet 13c is connected to the power amplifier A3, the coil of the electromagnet 13d is connected to the power amplifier A4, and each of the electromagnets 13a, 13b, 13c, 13d. The currents flowing through the coils are individually controlled by the power amplifiers A1, A2, A3, and A4. By this control, the magnetic force, that is, the attractive force of each electromagnet 13a, 13b, 13c, 13d is individually controlled.

The position sensors 14a to 14d are positions in the vicinity of the respective electromagnets 13a to 13d, that is, the position sensor 14a is in the vicinity of the electromagnet 13a, the position sensor 14b is in the vicinity of the electromagnet 13b, the position sensor 14c is in the vicinity of the electromagnet 13c, and the position sensor. 14d is disposed in the vicinity of the electromagnet 13d, and detects the position of the journal 2 relative to the inner peripheral surface at the positions where the electromagnets 13a, 13b, 13c, and 13d are disposed.

The detection amounts of the position sensors 14a to 14d detected at the respective positions are the detection amounts of the position sensor 14a arranged in the vicinity of the upper electromagnet 13a and the positions arranged in the vicinity of the lower electromagnet 13b as shown in FIG. Compared with the detection amount of the sensor 14b, the difference is input to the controller 15, and a current is passed through the coil of the electromagnet on the side with the smaller detection amount. For example, if the induction heating mechanism starts vertical vibration and the support rod 8 moves upward due to the vibration and the detection amount of the position sensor 14a increases, a current flows through the coil of the lower electromagnet 13b.

This current generates an attractive force of the electromagnet 13b, and the support rod 8 is suppressed from moving upward by the attractive force. Further, in the downward movement, the detection amount of the position sensor 14b increases, and an electric current is passed through the coil of the upper electromagnet 13a. This current generates an attractive force of the electromagnet 13a, and the support rod 8 is moved downward by the attractive force. Movement is suppressed. Similarly, the left and right movements of the support rod 8 generate the magnetic force of the electromagnet 13d, suppress the movement of the support rod 8 to the left, and the rightward movement generates the magnetic force of the electromagnet 13c. The movement of the support rod 8 to the right is suppressed. These suppressions suppress the vibration of the induction heating mechanism.

  By the way, in the embodiment shown in FIG. 1, the journal 2 is made of a magnetic material. However, a magnetic cylinder formed by cylindrically laminating flat silicon steel plates or silicon steel plates curved in an involute curve is shown in FIG. 2, the inner peripheral surface of the magnetic cylinder 16 and the electromagnet may be fitted into the inner peripheral surface of the journal 2 facing each other. Further, both ends of the magnetic cylinder are formed in a concave shape protruding inward, and the end surface protruding inward of the magnetic cylinder 17 formed in a concave shape is opposed to the magnetic pole surface of the electromagnet 2 as shown in FIG. You may make it fit in the inner peripheral surface. In this case, as shown in FIG. 4, if the magnetic cylinder 17 (or the magnetic cylinder 16) slides along the axial direction of the journal 2, it corresponds to the difference in expansion due to the heat of the roller and the support rod. be able to.

  Further, in the above embodiment, when the compressed gas can no longer be supplied to the static pressure gas bearing 10 or the power amplifiers A1, A2, A3, A4 for supplying current to the coils of the electromagnets 13a, 13b, 13c, 13d. If an unexpected situation such as a failure or a power failure occurs and the static pressure gas bearing or the electromagnet does not operate, the support rod 8 may fall on the inner surface of the journal 2 and damage the members such as the electromagnet 13. In order to eliminate this fear, as shown in FIG. 6, the inner diameter of the journal 2 may be slightly larger than the outer diameter of the support rod 8 between the outer peripheral surface of the support rod 8 and the inner surface of the journal 2. A mechanical bearing 18 such as a rolling bearing or a sliding bearing having a slightly smaller outer diameter may be provided. FIG. 6 shows a rolling bearing having an inner diameter slightly larger than the outer diameter of the support rod 8, and there is a gap between the support rod 8 and the bearing.

  The above is an embodiment in which the static pressure gas bearing mainly supports the load of the support rod. However, the load of the support rod may be supported by the magnetic force of the electromagnet without using the static pressure gas bearing. FIG. 7 is a cross-sectional view of one end portion of the induction heating roller device when the load of the support rod is supported by the magnetic force of the electromagnet. In this embodiment, as in the embodiment shown in FIG. 1, the hollow inner peripheral surface of the journal 2 is made of a magnetic material, and the outer peripheral surface of the support rod 8 facing the hollow inner peripheral surface of the journal is along the circumferential direction. As shown in FIG. 7 (b), the electromagnet 13a is attached at four positions on the top, bottom, left and right, that is, the electromagnet 13a at the upper position, the electromagnet 13b at the lower position, the electromagnet 13c at the left position, and the electromagnet 13d at the right position.

Similarly to the embodiment shown in FIG. 1, position sensors 14a, 14b, 14c, and 14d (position sensors 14c and 14d are not shown) are disposed in the vicinity of the electromagnets 13a, 13b, 13c, and 13d, respectively. The position sensor 14a is a position near the electromagnet 13a, the position sensor 14b is a position near the electromagnet 13b, the position sensor 14c is a position near the electromagnet 13c, and the position sensor 14d is a position near the electromagnet 13d from the hollow inner peripheral surface of the journal. To detect.

The coils of the electromagnets 13a, 13b, 13c, and 13d are connected to controllable power amplifiers A1, A2, A3, and A4 as shown in FIG. 5, and are respectively connected to the power amplifiers A1, A2, A3, and A4. The currents to be individually flowed, that is, the magnetic forces of the electromagnets 13a, 13b, 13c, and 13d are determined. The coil of the electromagnet 13b disposed at the lower portion is supported by the coil of the electromagnet 13a disposed at the upper portion to support the load of the support rod 8. Is applied to each of the electromagnets 13a, 13b, 13c, and 13d so that the support rod 8 is separated from the inner peripheral surface of the journal 2 and floats in the middle to remain stable. That is, each electromagnet 13a, 13b, 13c, 13d has a function as a magnetic bearing.

In addition, the detection amounts of the position sensors 14a to 14d detected at the respective positions are the detection amount of the position sensor 14a arranged in the vicinity of the upper electromagnet 13a and the vicinity position of the lower electromagnet 13b as shown in FIG. And the difference is input to the controller 15 to increase the current flowing through the coil of the electromagnet on the side with the smaller detection amount. For example, if the induction heating mechanism starts vertical vibration and the support rod 8 moves upward due to the vibration and the detection amount of the position sensor 14a increases, the current flowing through the upper electromagnet 13a decreases, and the lower electromagnet 13b Current is passed through the coil. Thereby, the support rod 8 is restrained from moving upward.

Further, in the downward movement, the detection amount of the position sensor 14b increases, and the current flowing through the coil of the upper electromagnet 13a increases. This increase increases the attractive force of the electromagnet 13a, and the support rod 8 is restrained from moving downward due to the increased attractive force. Similarly, the movement of the support rod 8 to the left and right increases the magnetic force of the electromagnet 13d by moving to the left, suppresses the movement of the support rod 8 to the left, and increases the magnetic force of the electromagnet 13c by moving to the right. The movement of the support rod 8 to the right is suppressed. These suppressions suppress the vibration of the induction heating mechanism.

When the attraction force of the upper electromagnet 13a is insufficient to support the load of the support rod 8, the position of another electromagnet 19 is aligned with the upper electromagnet 13a in the axial direction of the support rod 8 as shown in FIG. A sensor 20 may be provided. In this case, the current flowing through the coil of the electromagnet 19 is controlled independently by detecting the position of the position sensor 20 with respect to the inner peripheral surface of the journal 2. Of course, the vibration of the induction heating mechanism may be suppressed in cooperation with the magnetic force of the electromagnet 13a.

7 and 8, the magnetic cylinder formed by cylindrically laminating flat silicon steel plates or silicon steel plates curved in an involute curve into a cylindrical shape as shown in FIG. Even if the inner peripheral surface of the magnetic cylinder 16 and the electromagnet are fitted to the inner peripheral surface of the journal 2 facing each other, both ends of the magnetic cylinder are formed in a concave shape protruding inward, as shown in FIG. 4 may be fitted into the inner peripheral surface of the journal 2 with the end face protruding inside the magnetic cylinder 17 formed in a concave shape facing the magnetic pole surface of the electromagnet, and in addition, as shown in FIG. The magnetic cylinder 16 may be slid along the axial direction of the journal 2.

Further, when an unexpected situation such as a power failure occurs, the support rod 8 may fall on the inner surface of the journal 2 and damage the members such as the electromagnet. In order to eliminate this fear, as shown in FIG. 6, the inner diameter of the journal 2 may be slightly larger than the outer diameter of the support rod 8 between the outer peripheral surface of the support rod 8 and the inner surface of the journal 2. A mechanical bearing 18 such as a rolling bearing or a sliding bearing having a slightly smaller outer diameter may be provided.

As described above, in each embodiment, position sensors are arranged at equal intervals in four circumferential directions on the outer peripheral surface of the end portion of the support rod, and the vibration of the support rod is detected by comparing the detection amounts of the opposing position sensors. Although the magnetic force generated by each electromagnet is controlled so as to suppress vibration, the vibration of the support rod is analyzed and predicted by a computer or the like, and the magnetic force generated by each electromagnet is controlled based on the prediction. Alternatively, the magnetic force of each electromagnet may be controlled using an acceleration sensor that detects acceleration due to vibration instead of the position sensor.

In addition, the electromagnets are attached to the outer peripheral surface of the support rod at four locations on the upper, lower, left, and right sides in the circumferential direction. However, the number of electromagnets is not limited to four, and the arrangement positions are also four locations on the upper, lower, left, and right sides. It is not limited.

Further, the above explanation is for the case where one of the support rods is supported in one journal of the journal integrally fastened to both ends of the roller shell. You may make it support by the magnetic force of a pressurized gas bearing or an electromagnet, In this case, rotation of a support rod will be blocked | prevented with a base.

In any of the above embodiments, the support rod is supported through the inner peripheral surface of the journal and the space, so that the life of the bearing portion can be extended, and the attachment / detachment work for maintenance, inspection, replacement, etc. of the bearing becomes unnecessary. In addition, the workability in the assembly and disassembly of the roller is greatly improved, and the induction coil of the induction heating mechanism accompanying the mechanical natural vibration in the primary simple support mode of the internal induction heating mechanism is formed on the inner peripheral surface of the roller. There is no risk of contact damage.

It is sectional drawing (a) and the front view (b) of the one end part of the induction heating roller apparatus which concern on the Example of this invention. It is sectional drawing (a) and the front view for description (b) of the one end part of the induction heating roller apparatus which concerns on the other Example of this invention. It is sectional drawing of the one end part of the induction heating roller apparatus which concerns on the other Example of this invention. It is sectional drawing of the one end part of the induction heating roller apparatus which concerns on the other Example of this invention. It is a block diagram of the control circuit which concerns on the Example of this invention. It is sectional drawing of the one end part of the induction heating roller apparatus which concerns on the other Example of this invention. It is sectional drawing (a) and the front view (b) of the one end part of the induction heating roller apparatus which concern on the other Example of this invention. It is sectional drawing of the one end part of the induction heating roller apparatus which concerns on the other Example of this invention. They are sectional drawing (a) and an important section expanded sectional view (b) of an induction heating roller device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller shell 2, 3 Journal 4 Machine stand 7 Induction heating mechanism 8 Support rod 10 Static pressure gas bearings 13a-13d, 19 Electromagnets 14a-14d, 20 Position sensor 16, 17 Magnetic cylinder 18 Mechanical bearing

Claims (3)

The outer circumferences of the hollow journals attached to both sides of the roller are rotatably supported on the machine base via bearings on both sides thereof, and an induction heating mechanism for inductively generating heat of the rollers is provided in the hollows of the journals on both sides. In an induction heating roller device, which is fixed to a support rod inserted through the inside and disposed inside the roller, and at least one end of the support rod is supported in the journal via a bearing , the support rod is supported. the inner peripheral surface of the journal located outside the bearing and the magnetic material, the outer peripheral surface of the front Symbol the support rods to the magnetic body and opposed, with arranging a plurality of electromagnets along the circumferential direction, before SL of each electromagnet a position sensor for detecting the position from the inner circumferential surface of the journal in the vicinity provided separately magnetic force is each electromagnet on the basis of a detection signal of the position sensor Gyoshi, induction heating roller apparatus characterized by the rotation of the roller formed by suppressing the vibration transmitted to the support rod. The induction heat generation according to claim 1, wherein a bearing supported by a support rod in the journal is a static pressure gas bearing, and the support rod is supported via a space with respect to an inner peripheral surface of the journal. Roller device. The induction heating roller device according to claim 1 or 2, wherein a mechanical bearing is disposed between the outer peripheral surface of the support rod and the inner peripheral surface of the journal with a gap.

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