JPS6324101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating roller that heats an object while transporting it, and particularly relates to an induction heating roller suitable for a heat treatment process of synthetic fibers, such as a direct spinning drawing device, a stretching device, etc. .

When heating yarns such as synthetic fibers using such induction heating rollers, it is required to uniformly heat the yarns in order to stabilize the yarn quality and process.
In general, induction heating rollers generate heat in the entire roller, but the way heat is removed from heated parts such as threads is uneven in the axial direction, and the difference in the amount of heat is large, so the axial direction of the induction heating roller The drawback was that the surface temperature was not uniform.

In order to improve these drawbacks, various heating medium type induction heating rollers have been devised in which a heating medium is sealed in a jacket provided on the roller shell portion of the induction heating roller or its inner circumferential surface, and these rollers have come into widespread use in recent years. There is.

For example, Japanese Patent Publication No. 52-41896 discloses a jacket in which a number of holes parallel to the axial direction of the heating roll body are provided concentrically in the circumferential direction, and the holes are formed in communication with each other along the circumferential direction. A heating medium type induction heating roller in which a heating medium is sealed is disclosed. However, such conventional heating medium type induction heating rollers have the following drawbacks because the entire roller is constructed from one jacket. In other words, as mentioned above, since the structure of the jacket is complicated with multiple holes communicating with each other, it is not possible to remove impurities sufficiently when the heat medium is sealed, and as the heat medium is used, some of the impurities turn into inert gas. If pinholes occur during use, the temperature distribution may worsen, or the inert gas may accumulate due to deterioration of the heating medium, etc. There are problems such as the accumulation of these substances and deterioration of the temperature distribution, and the disadvantage that they cannot withstand long-term use. Furthermore, in order to repair a defective heating roller, it is necessary to perform a time-consuming heat medium filling operation and a performance test, which are the same as in the manufacturing process.

In addition, if the amount of heat medium used is large and the roller temperature rises due to operational problems such as unbalance and vibration at the start of rotation, or failure of temperature control equipment, etc., the internal pressure of the jacket increases.
There was a safety issue in that the rollers could explode. To address the latter safety problem, measures have been taken to prevent it by installing mechanical safety valves such as rupture disks, but such safety valves are designed to prevent the temperature from exceeding the specified temperature (before reaching the specified temperature, There were other practical problems, such as the ability to operate with

The inventors of the present invention have made extensive studies to address these problems, and have thus arrived at the induction heating roller of the present invention that can withstand long-term use by taking advantage of the features of the jacketed induction heating roller.

That is, the present invention provides an induction heating roller that heats an object while transporting it, in which a large number of concentric holes parallel to the axial direction of the roller body are provided in the roller shell portion of the roller body, and
The induction heating roller is characterized in that a heat pipe element containing a heating medium is removably inserted into the hole.

The present invention will be explained below based on examples and with reference to the drawings.

1 and 2 are a longitudinal (axial) cross-sectional view of an induction heating roller according to an embodiment of the present invention, and a transverse cross-sectional view of the roller shell portion thereof.

As shown in FIGS. 1 and 2, the induction heating roller of this embodiment includes a roller body 1 that heat-treats yarn, etc., and a drive motor (not shown) that supports and rotates the roller body 1. Driven rotating shaft 6
The roller body 1 is composed of an iron core 7 and a coil 8, which are fixed to a machine stand (not shown) or the like, which constitute a magnetic flux generation mechanism that generates an alternating magnetic flux in the axial direction of the roller body 1. The structure of such an induction heating roller is already known.

By the way, the roller body 1 is provided with a number of holes 3 in the circumferential direction at predetermined intervals parallel to the axial direction of the roller body 1, that is, the direction of the rotation axis 6 in the roller shell portion 1a, and a known heat pipe element 2 is installed in the holes 3. It has a configuration in which it is inserted. Then, the heat pipe element 2 is attached to the cover 4 by screws 5.
is attached and fixed in hole 3. Further, the gap between the hole 3 and the heat pipe element 2 is filled with a material having good thermal conductivity to improve heat transfer between the roller body 1 and the heat pipe element 2.

Therefore, when an alternating current is passed through the coil 8, as in the conventional induction heating roller, the roller shell 1 is heated by induction, and at the same time, the heat pipe element 2 is also heated by thermal conduction, raising the temperature to a predetermined temperature.
By the way, the surface temperature of the roller shell portion 1a is increased because the windage load during rotation and the load amount of the heat-treated yarn etc. are significantly different in the axial direction of the roller shell portion 1a. Ciel 1a
to create a large difference in the axial direction. However, the heat pipe element 2 inserted into the hole 3 is moved from the location where the load is low to the location where the load is high in the axial direction of the heat pipe element 2, that is, in the axial direction of the roller shell 1a, in accordance with the known operating principle of a heat pipe. It acts to freely generate heat transfer and make the axial temperature distribution of the roller shell 1a uniform. That is, the heat pipe element 2 performs the same function as the jacket of a conventional heating medium type induction heating roller in terms of axial heat transfer. On the other hand, the load on the roller shell portion 1a in the circumferential direction is equalized because the roller body is rotating, so the load on the roller shell portion 1a in the circumferential direction is
The temperature distribution is stable within a range that poses no practical problems. Therefore, with the above-described configuration, performance equivalent to that of the conventional heating medium type induction heating roller can be ensured, and various effects described below can be obtained. One of the effects is that the production of the roller body 1 is greatly simplified, as will be described below. That is, in the roller body 1, first, a hole 3 is bored in the roller shell portion 1a by machining or the like, then the heat pipe element 2 is inserted into the hole 3, and the cover 4 is screwed in with the screw 5.
It can be manufactured by attaching it. Therefore, there is no need for the complicated process of constructing a complicated jacket, enclosing a heating medium in the jacket, and performing a temperature increase test, as in the case of conventional heating medium type induction heating rollers. The pipe element 2 can be manufactured completely independently, and a commercially available mass-produced heat pipe element 2 of stable quality can be used as is, so manufacturing is very easy. The gap between the hole 3 and the heat pipe element 2 can be filled with a thermally conductive substance by applying a thermally conductive paste to the heat pipe 2 and inserting it into the hole 3;
This can be easily realized by filling the hole 3 with liquid metal and inserting the heat pipe 2 therein, or by filling the gap between the hole 3 and the heat pipe 2 with liquid metal.

In addition, the heat pipe element 2 has a simple shape, and the material suitable for the heat medium can be selected, so stable functionality can be ensured.In addition, the heat pipe element 2 has been developed in recent years to be used for uniform cooling of molds for injection molding materials, etc. It is used in large quantities and has a long lifespan. Since a commercially available heat pipe manufactured under sufficient quality control can be used as is, it has a longer lifespan than conventional heating medium type induction heating rollers.

Furthermore, since a large number of heat pipe elements 2 are used, even if some of them stop functioning due to pinholes or the like, the temperature distribution in the roller shell portion 1a will not change drastically unlike in the conventional case. This prevents a large amount of product loss due to sudden failures.

Even in the above case, since the heat pipe element 2 is made removable, it can be easily repaired by simply replacing the heat pipe element 2.

In addition, the problems associated with the conventional vibration generation mentioned above,
and safety issues were also resolved as follows. In other words, in the method of the present invention, the amount of heat medium used is significantly reduced to about one-tenth of that of the conventional method, and the heat medium is distributed to each heat pipe, resulting in a good balance and less vibration at the start of rotation. There has been no occurrence of
In addition, in the case of the device of the present invention, when the heat pipe is heated abnormally, the seal portion of each heat pipe melts at the specified temperature, and the heat medium (usually water) sealed in the heat pipe is only spouted out, and the roller It doesn't explode. Since the heat pipes are individually inserted into each hole provided in the axial direction of the roller, it is extremely safe in terms of explosion resistance. In this way, the problems with the conventional method have been completely solved.

By the way, in the above embodiment, the gap between the heat pipe element 2 and the hole 3 is filled with a thermally conductive material, but the dimensional accuracy of the heat pipe element 2 and the hole 3 is regulated. In some cases, it may be sufficient to maintain contact with Further, although the holes 3 and the heat pipe elements 2 are circular, it goes without saying that their shapes are not limited to their shapes.

Furthermore, although the heat pipe element 2 is fixed using the cover 4 and the screws 5, it is also possible to cut a screw in the hole 3 and fix the heat pipe element 2 with screws, so that the heat pipe element 2 can be fixed stably even during rotation. Any material that can fix 2 is fine. Further, although the hole 3 is shown as being formed in the roller shell 1a with one end closed, the hole 3 may be a through hole and both ends may be fixed with separate parts. Although it becomes difficult to replace the heat pipe element 2 when the heat pipe element 2 is rotated at high speed, it may be fixed by aluminum casting or the like.

The required number and thickness of heat elements 2 are as follows:
It goes without saying that the design should be done taking into account the usage conditions and other experimental data as appropriate.

Furthermore, it is effective to improve the temperature distribution in the axial direction by providing a known secondary conductive layer made of a highly conductive material such as copper at a suitable location on the inner circumferential surface of the roller shell 1a.

Furthermore, although a roller suitable for yarn processing has been shown, it is obvious that it can also be applied to processing rollers for other papers, films, etc.

As described above, according to the present invention, heat pipe elements with established technology are combined to perform the same function as a conventional jacket, so that the induction tube is stable over a long period of time, easy to manufacture, and inexpensive. A heat generating roller is obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a longitudinal sectional view of an induction heating roller and a lateral sectional view of the roller shell portion thereof, showing one embodiment of the present invention. 1: Roller body, 2: Heat pipe element.

Claims (1)

[Scope of Claims] 1. In an induction heating roller that heats an object while transporting it, a large number of holes parallel to the axial direction of the roller are provided in a substantially concentric circle in the roller shell, and a heating medium is supplied to the holes. An induction heating roller characterized by a removably inserted encapsulated heat pipe element. 2. The induction heating roller according to claim 1, wherein a gap between the hole and the heat pipe element inserted into the hole is filled with a thermally conductive material.