JPS6213352Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an induction heating roller device, particularly an induction heating roller device with a cooling function.

As is well known, induction heating roller devices are widely used to continuously heat threads, films, etc. as loads. However, changes in the heating conditions for these loads may require lowering the surface temperature of the roller, and in order to satisfy such demands, a cooling function may be provided. It may also be necessary to cool the load by bringing it into contact with the surface of the roller. In this case, it is sufficient to maintain the surface temperature of the roller lower than the temperature of the load, but if you want to maintain the surface temperature of the roller at a certain temperature, it is necessary to forcibly cool the roller so that it is lower than the target temperature. The temperature may be set to a slightly low temperature, and the temperature of the roller may be raised to a target value by induction heat generation in this state.

By the way, in order to provide a cooling function to a roller, it is sufficient to use a cooling medium, so conventionally,
A cooling pipe was embedded in the thick part of the peripheral wall of the roller, and the cooling medium was made to flow there. This is convenient because the peripheral wall of the roller is cooled by the inflowing cooling medium. However, since the rollers rotate, the pipes must also rotate together, and a mechanism such as a rotating joint is required to flow the cooling medium through the pipes, which has the disadvantage that the configuration is inevitably complicated. be.

The purpose of this invention is to cool the rollers with a simple configuration.

An embodiment of this invention will be described below with reference to the drawings.
Reference numeral 1 denotes a roller body, which is provided with hollow shafts 2A and 2B at both ends, and is rotatably supported on a machine base 4 by outer bearings 3A and 3B. Then, it is rotated by an appropriate external drive source (for example, a motor, etc.). The peripheral wall portion 5 of the roller body 1 is composed of an inner cylindrical portion 6 and an outer cylindrical portion 7, and a jacket chamber 8 is formed between the two cylindrical portions 6, 7. Reference numeral 9 denotes a gas-liquid two-phase heat medium such as water or oil sealed in the jacket chamber 8 .

A small bearing 10 is installed inside the hollow shafts 2A and 2B.
A hollow shaft 11 is inserted through A and 10B, and is fixedly supported on, for example, a machine stand as a stationary body regardless of the rotation of the roller body 1. Reference numeral 12 denotes a passageway for a refrigerant medium (for example, water, oil, etc.) for cooling the roller body 1 according to this invention, and is composed of a pipe or the like. This cooling medium is then introduced from one end 12A of the passage 12,
It is discharged from the other end 12B. Both ends 12
A and 12B are led out to the end side of the shaft 11.
The intermediate portion 12C is led through a hole 11A provided in the peripheral wall of the shaft 11 into the interior of the roller body 1, particularly into its lower half. In Figure 1, the middle part 12C
is one round trip, but in reality it is better to make several round trips as shown in Figure 2.

An intermediate heat medium (for example, silicone oil, etc.) 13 is housed inside the roller body 1 . The intermediate portion 12C of the passage 12 is immersed in the intermediate heat medium 13. 14, the intermediate heat medium 13 is the shaft 2
This is a liquid seal (for example, an O-ring) that prevents liquid from leaking between A, 2B and the shaft 11. Reference numeral 15 denotes a magnetic flux generating mechanism disposed within the roller body 1, specifically an iron core 16A disposed in the middle of the shaft 11 (the core may also serve as the shaft 11); The induction coil 16B is wound around the outer circumference of the induction coil 16B. 1
Reference numeral 7 denotes a conducting wire for supplying current to the induction coil 16B, which is connected to an AC power source.

It is well known that the induction heating roller is constructed by the relationship between the magnetic flux generating mechanism 15 and the roller body 1. That is, when the induction coil 16B is excited by an AC power source, the alternating magnetic flux generated thereby passes through the iron core 16A along its axial direction, and then from its end to the peripheral wall 5 of the roller body 1.
, pass along the axial direction of the iron core 1, and pass through it again.
Return to the other end of 6A. This alternating magnetic flux causes an induced current to flow in the circumferential wall portion 5 of the roller body 1 along its circumferential direction, thereby causing the circumferential wall portion 5 to generate heat.

A temperature sensor 18 detects the temperature of the peripheral wall 5, and is embedded in the thick part of the peripheral wall 5. 19
is a lead wire leading to the temperature sensor 18, and is connected to a slip ring 20 that rotates integrally with the roller body 1. 21 is a brush that slides on the slip ring 20. A voltage generated by the temperature sensor 18 in response to the temperature of the peripheral wall portion 5 is taken out to the outside via a lead wire 19, a slip ring 20, and a brush 21. Then, the voltage applied to the induction coil 16B is changed according to the temperature detected by the temperature sensor 18 to adjust the amount of heat generated by the magnetic flux generation mechanism 15 of the roller body 1, and the temperature of the roller body 1 is kept at a predetermined value. maintain. 22 is a liquid sealing filler inside the shaft 3.

By the way, in order to use the configuration shown in the figure as an induction heating roller, the magnetic flux generation mechanism 1 is required as described above.
According to this invention, in order to cool the roller body 1, the cooling medium may be introduced from the end 12A of the passage 12 and discharged from the end 12B. The discharged cooling medium is cooled by a heat exchanger, and is returned to the end 12A.
It is good to have it flow into the As a result, the intermediate part 12C becomes low temperature, so the intermediate heat medium 1 in contact with it
3 will be cooled down. When the intermediate heat medium 13 is cooled in this way, the inner circumferential surface of the roller body 1 is in contact with it, so that the roller body 1 is cooled from its inner surface. At this time, the ends of the passage 12, that is, the inflow and outflow ends of the cooling medium are stationary, so no rotary joint is required for the inflow and outflow of the cooling medium.

In the above explanation, only the effect of cooling the roller body 1 by the intermediate heat medium 13 was explained, but since the intermediate heat medium 13 is in contact with not only the inner peripheral surface of the roller body 1 but also the induction coil 16B, These will also be cooled. As a result, the temperature of the induction coil 16B is also lowered, so that the induction coil and the electrical insulator used therein are prevented from thermal deterioration, and their lifespan can be extended. Note that the intermediate heat medium 13
The cooling medium may also be used.

As detailed above, according to this invention, when cooling the roller body, no pipe is inserted into the thick part of the peripheral wall of the roller body. This has the effect of allowing water to flow in and out of the water.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of this invention, and FIG. 2 is a cross-sectional view of the same. 1...Roller body, 2A, 2B...Rotating shaft, 5
... Peripheral wall part, 11 ... Axis, 12 ... Passage, 13 ...
...Intermediate heat medium, 15...Magnetic flux generation mechanism.

Claims (1)

[Scope of utility model registration request] a rotatably supported roller body; a stationary shaft inserted into the roller body;
a magnetic flux generation mechanism supported by the shaft and generating magnetic flux for causing the roller body to generate heat by induction; an intermediate heat medium sealed inside the roller body; and a cooling device that cools the intermediate heat medium. an induction heating roller device comprising a passageway passing through the interior of the shaft through which a medium is allowed to flow in and out;