JPH0214185B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat-shrinkable member formed into various shapes such as tubes and sheets, which is heat-shrinked and coated. This relates to a heat shrinkage device.

[Conventional technology]

Heat-shrinkable plastics made of polyolefin or silicone rubber are widely known as materials for heat-shrinkable members, and heat-shrinkable tubes shaped like tubes are used to connect electrical wires, optical fibers, capacitors, etc. Used for insulation coating of coils, etc. Further, heat-shrinkable sheets formed into sheet shapes are used for wrapping confectionery and stationery, packaging, and the like.

These heat-shrinkable materials generally contract flexibly along the surface of the object to be coated, such as wire rods, electronic parts, and confectionery, by simply heating it to about 100 to 200 degrees Celsius, making it possible to coat the object in close contact with the object. It has an excellent function. The thermal contraction rate of these heat-shrinkable members varies depending on the heating temperature, but in the case of silicone rubber, it reaches 40% or more when heated to about 150°C. Therefore, when performing coating using a heat-shrinkable material, use a heat-shrinkable tube or sheet that is approximately 1.5 to 2 times the size of the object to be coated, and It is common practice to avoid cracking or tearing.

By the way, warm air dryers have been widely used for the heat shrinking work of these heat shrinkable members due to their simplicity. Then, by blowing hot air of 200 to 300°C from a hot air dryer onto a heat shrinkable tube, so-called warm air convection heating is performed, heating the heat shrinkable member and coating the object. Was.

However, when hot air is blown onto a heat-shrinkable member by a hot air dryer as described above, the temperature of the hot air drops rapidly even if the hot air dryer is a little away from the outlet. The hot air may spread out, resulting in a large temperature distribution locally, making it extremely difficult to heat the heat-shrinkable member at a uniform temperature. Therefore, the coating process requires skilled workers to carefully adjust the direction of the hot air from the hot air dryer while observing the degree of shrinkage of the heat shrink tube. It was hot.

[Problem that the invention seeks to solve]

In the above-mentioned prior art, the concept of heating the heat-shrinkable member at a uniform temperature is not introduced, since the heat-shrinkable member has a characteristic that the heat shrinkage rate varies depending on the heating temperature. Furthermore, due to the high thermal contraction rate of the heat-shrinkable material, the heat-shrinkable material before heat-shrinking is about twice the size of the object to be covered, and only loosely covers the object to be covered. ,
Therefore, it is in a state where it is extremely easy to move due to some kind of stress, but in this respect as well, the concept of heat shrinking without applying force to the cover made of a heat shrinkable material has not been introduced. The heating device for heating at a relatively low temperature of about 150°C was simply a hot air dryer.

Therefore, according to such conventional technology, due to the inefficiency of heat transfer of hot air, it takes a long time to heat-shrink the heat-shrinkable member, resulting in poor workability. Further, it is difficult to uniformly shrink the heat-shrinkable member, and in some cases, wire rods, cases, etc. placed around the heat-shrinkable member may be burnt out. Furthermore, depending on the wind speed and direction from the hot air dryer, the heat-shrinkable member itself may be moved, causing problems such as being coated at a position deviated from the intended position.

In any case, according to the conventional technology, it is difficult to maintain the quality of coating treatment at a constant level, and moreover, it requires skilled workers, which not only lacks workability but also makes quality control difficult. had.

Therefore, the present invention solves the various problems of the above-mentioned conventional techniques, and provides a heat shrinking device for heat shrinkable members that has excellent workability, is easy to perform quality control, and can perform uniform coating treatment. The purpose is to provide

[Means for solving problems]

The heat shrinking device for heat shrinkable members according to the present invention includes:
A heat shrinking device for a heat-shrinkable member that coats a short heat-shrinkable member onto a covering object having a wire portion that is easily affected by heat, and is arranged so as to sandwich the covering object from both sides. At least a pair of bar-shaped lamp light sources that emit heat rays capable of radiant heating of a short heat-shrinkable member attached to an object; and a lamp light source disposed outside the lamp light sources to reflect the heat rays of the lamp light source toward the heat-shrinkable member. a pair of reflective mirrors, a holding member that immovably holds the object to be coated in a direction substantially orthogonal to the lamp light source so that the heat-shrinkable member faces the irradiation position of the heat ray, and a timer that controls the light emission time of the lamp light source. It is characterized by having the following.

[Effect]

After the object to be coated is immovably held by the holding member, the lamp light source is caused to emit light for a predetermined period of time using a timer, and the heat rays are used to subject the heat-shrinkable member to secondary radiation heating, thereby coating the object to be covered with the heat-shrinkable member.

In this case, by using the lamp light source and the holding member, the object to be coated can be fixed and only the heat-shrinkable member can be properly heated, and the object to be covered can be heated without any adverse thermal effects due to radiation heating. Only the heat-shrinkable member can be heated intensively.

Next, by providing a timer, the heating time can be controlled according to the heat-shrinkable member used, and the thermal influence on the object to be coated due to excessive heating can be reduced.

Furthermore, since it is equipped with a reflective mirror and the holding member holds the object to be coated in a direction substantially orthogonal to the rod-shaped lamp light source, it is possible to heat a plurality of short objects to be coated at the same time, and the heat-shrinkable member can be heated relatively uniformly. It can be heated to.

〔Example〕

Hereinafter, some embodiments of the present invention will be described with reference to FIGS. 1 to 5 of the accompanying drawings.

FIG. 1 is a block diagram of the configuration of a first embodiment of the present invention viewed from the side (a) and the front (b). A heat-shrinkable tube 1 as an example of a heat-shrinkable member extends in the front and back directions of the drawing, and an electric wire 2 as an example of an object to be covered is inserted through the heat-shrinkable tube 1, and halogen lamps are installed above and below it as a light source. A lamp 3 is provided. The halogen lamp 3 is connected to a power source 4. Electric wire 2
The heat-shrinkable tubes 1 inserted through the heat-shrinkable tubes 1 are placed on the positioning member 5, and the plurality of heat-shrinkable tubes 1 are positioned so that the adjacent positions of the heat-shrinkable tubes 1 match the light irradiation position of the halogen lamp 3.

Next, the operation of the above embodiment will be explained. First, the heat-shrinkable tube 1 into which the electric wire 2 is inserted is positioned and placed at a predetermined position by the positioning member 5. Next, the upper halogen lamp 3 is made parallel to the row of heat shrink tubes 1 using the opening/closing structure (not shown) of the upper halogen lamp 3, and then the power source 4
The halogen lamp 3 is energized to emit light, and the heat shrink tube 1 is irradiated with light. In this way, the heat shrink tube 1 can be attached to the upper and lower halogen lamps 3.
Thermal contraction occurs due to radiant heating. In this case, since radiant heating is performed by the hot rays of the halogen lamp 3, only the heat shrink tube 1 that is irradiated with the hot rays is heated, and the electric wire 2 is hardly heated.
The vinyl coating will not be deformed by heat.

Note that a timer 6 is connected to the power source 4, and it is possible to stop the power supply when a predetermined time has elapsed. In this way, heat shrink tube 1
receives optical radiation heating from the upper and lower halogen lamps 3, and after thermal contraction, the optical radiation heating stops at the time of optimal contraction, and then cooling is performed after the contraction.
If the heating time is appropriately controlled by the timer 6 in this way, excessive heating will not be performed more than necessary, and the wire 2
It is possible to minimize the thermal influence on the

Further, in order to improve cooling efficiency, it is also possible to send cold air from a blower (not shown) to perform forced cooling.

Next, a specific example of the above embodiment will be explained. In this specific example, a heat-shrinkable tube 1 with an inner diameter of 18 mm was used, and a vinyl electric wire 2 with a finished outer diameter of 12 mm was inserted therethrough. Halogen lamp 3 has a 1kw heat generation effective length of 445mm.
20 heat-shrinkable tubes 1 were arranged in a plane, and one tube was placed above and below the tubes so as to be perpendicular to the longitudinal direction of the tubes 1. The distance between the heat shrink tube 1 and the halogen lamp 3 is approximately 40 mm, and this distance can be adjusted to be wide or narrow depending on the size of the object to be heated. Further, the halogen lamp 3 provided above the heat-shrinkable tube 1 is configured to be openable and closable using a hinge connection provided at one end as a fulcrum.
Incidentally, a reflecting mirror 7 is provided on the outside of both halogen lamps 3, 3, so that the light from the halogen lamp 3 is effectively irradiated onto the heat shrinkable tube 1.

In the above specific example, 6 seconds is sufficient for the energization time of the halogen lamp 3. And this energization time is 3
Even if the time is changed to about 10 seconds, the finish of the heat-shrinkable tube 1 after the coating process hardly changes, and extremely stable coating process can be performed.

In the above specific example, the inner diameter of the heat-shrinkable tube 1 is 18 mm, and 20 tubes are lined up in a flat shape for heat shrinkage. Adjust the distance between the protrusions of the positioning member 5 so that more electric wires 2
can also be coated at the same time.

Furthermore, the halogen lamp 3 can be constructed from a plurality of rod-shaped light sources arranged in parallel, and in this way, the shrinkable region of the heat-shrinkable tube 1 can be lengthened. For example, by arranging two 1 kW halogen lamps in parallel at intervals of 40 mm, a heat shrink tube 1 having a length of 80 to 100 mm can be heat-shrinked.

Furthermore, the light source is not limited to the halogen lamp 3, but can also be composed of a light source that is optimal for the wavelength characteristics of the light absorption rate of the heat shrink tube 1, or a combination of different types of light sources, such as a xenon bulb with excellent short wavelength characteristics or a visible light source. It is also possible to use a tungsten bulb that matches the wavelength, or an infrared lamp or infrared heater that has excellent infrared wavelength characteristics.

Additionally, an upper halogen lamp 3 having an opening/closing structure is provided.
A pressure contact member 8 which is a holding member is attached to the holder, and when the halogen lamp 3 is closed parallel to the row of heat shrink tubes 1, the pressure contact member 8 presses the heat shrink tube 1 together with the electric wire 2 to the positioning member 5 side. I'm starting to be able to do it. In this case, the positioning member 5 may be provided with a pressure contact member 8 made of piano wire, stainless steel mesh, etc., so that the placed heat-shrinkable tube 1 can be pressed from above and pressed against the positioning member 5 side.

FIG. 2 is a block diagram showing the configuration of a second embodiment of the present invention. The structure differs from the structure of the embodiment shown in FIG. 1 in the following four points. That is, firstly, the halogen lamp 3 is provided only on one side (upper side) of the heat-shrinkable tube 1, and secondly, the mirror 7 is provided on the opposite side of the halogen lamp 3 across the heat-shrinkable tube 1. Thirdly, there is a light source controller 20 that controls blinking of the halogen lamp 3.
and photodetectors 21 and 22 are provided, and photodetector 2
A safety switch 25 is provided to confirm that the light detection signals 1 and 22 are supplied to the light source controller 20, and fourthly, the positional relationship between the halogen lamp 3 and the heat shrink tube 1, and a lighting permission signal 26 is provided.
is supplied to the light source controller 20.

Next, the operation of the second embodiment will be explained. According to the above structure, the light from the halogen lamp 3 passes through the gaps and unblocked portions of the heat-shrinkable tubes 1 disposed adjacent to each other, and is reflected by the reflecting mirror 7. This reflected light works together with the light directly irradiated onto the heat shrink tube 1 from the halogen lamp 3 to heat the heat shrink tube 1. Also, halogen lamp 3
A part of the light emitted from the heat shrink tube 1 that passes through the gap in the heat shrink tube 1 is detected by the photodetector 21 and supplied to the light source controller 20 as a photodetection signal 23 . The heat-shrinkable tube 1 contracts due to optical heating, and the amount of light that passes through the gap between adjacent heat-shrinkable tubes 1 and enters the photodetector 21 increases as the shrinkage progresses, and the shrinkage adheres closely to the outer diameter of the wire. When the coating process is completed, the increasing tendency of the amount of incident light stops. As a result, the light source controller 20 that receives the photodetection signal 23 can stop power supply to the halogen lamp 3 and control the light amount so as not to cause excessive heat shrinkage or burnout of the heat shrink tube 1.
Therefore, optimum coating treatment can be stably performed.

In addition, the photodetector 22 directly detects the amount of light from the halogen lamp 3 and sends the light output fluctuations due to fluctuations in power supply voltage, temperature rise of the filament, deterioration of light source lamp characteristics, etc. to the light source controller 20 as a photodetection signal 24. give. Automatic control to compensate for this light output variation is performed via the light source controller 20, and an abnormality warning is issued when an abnormality occurs due to, for example, a disconnection of the light source lamp. Furthermore, the safety switch 25 is composed of a limit switch that checks the positions of the halogen lamp 3 and the heat shrink tube 1, and checks whether the heat shrink tube 1 is placed at an appropriate irradiation position for the halogen lamp 3 and whether the light emitting position of the halogen lamp 3 is correct. It is determined whether or not it is appropriate, and the permission/disapproval of power supply from the light source controller 20 to the halogen lamp 3 is controlled.

According to the second embodiment, the halogen lamp 3
The light irradiated onto the heat shrink tube 1 is detected by the photodetector 2.
1 and 22 and the light amount is controlled.
It is possible to always optimally heat-shrink the heat-shrinkable tube 1 and realize an ideal coating process. In addition, since the light from the halogen lamp 3 is effectively irradiated onto the heat shrinkable tube 1 by the reflection mirror 7, the power consumption of the halogen lamp 3 is significantly reduced, and the power consumption of the halogen lamp 3 is greatly reduced.
It can save power and be smaller and lighter.

FIG. 3 is a top view showing the configuration of a third embodiment of the present invention. Halogen lamp 3 installed in the center
A plurality of heat-shrinkable tubes 1 held by positioning members 5 are arranged circumferentially around the . In the figure, the longitudinal direction of the heat-shrinkable tube 1 is the front and back directions of the page, and the heat-shrinkable tube 1
A cylindrical capacitor 30, which is an object to be covered, is inserted through the cap. Further, the heat-shrinkable tubes 1 arranged in a circumferential manner are rotated together with the cylindrical capacitor 30 by the rotation mechanism of the positioning member 5, so that the entire circumference of the heat-shrinkable tube 1 surrounding the cylindrical capacitor 30 is evenly illuminated. It's starting to heat up.
Further, a compound curved mirror 31 having a halogen lamp 3 at its center is arranged outside the heat shrinkable tube 1 arranged in a circumferential manner, and irradiates the heat shrinkable tube 1 with reflected light from the halogen lamp 3. It's becoming like that.

Next, the operation of the third embodiment will be explained. According to the above structure, the heat-shrinkable tube 1 is irradiated with the light emitted by the halogen lamp 3 without waste. The heat-shrinkable tube 1 surrounding the rotating cylindrical capacitor 30 is uniformly heated by light around the entire circumference, so even if the object to be coated is large in shape, it is possible to uniformly coat the surface. .

FIGS. 4 and 5 show that the heat-shrinkable member according to the present invention is formed of heat-shrinkable materials that absorb different amounts of light from a light source, and is coated by light irradiation. This is to explain an example. FIG. 4 is a side view, partially in cross section, showing the structure of a feedthrough capacitor 40 coated as an example of an object to be coated whose shape and dimensions are partially different. The feedthrough capacitor 40 has a portion with an outer diameter D ₁ and a portion with an outer diameter D ₂ extending in the axial direction of the lead wire 41, and the outer diameter D ₁ is the outer diameter.
It is more than double that of D ₂ . Such shapes are widely seen in electronic components such as diodes and noise filters, as well as in stationery.

By the way, it has not been possible to coat objects to be coated whose partial shapes and dimensions are significantly different as described above by using a heat-shrinkable member having a uniform heat shrinkage rate. This is because the heat shrinkage rate of heat-shrinkable materials is over 40%, but if the size of the object to be coated (in the case of the illustration, the outer diameter) differs greatly, even heat shrinkage may still be insufficient. There may be parts that cannot be coated (in the case shown, parts with a small outer diameter), or the amount of shrinkage of the cover may become excessive compared to the external dimensions of the object to be coated, and the cover may burst. It is from.

According to the heat-shrinkable member according to the present invention, the drawbacks of the prior art described above can be overcome. That is,
The amount of light absorption of the cover is made to vary locally, and when light is irradiated from the light source, the heat shrinkable material is heated differently due to light absorption, and the amount of heat shrinkage of the cover is partially varied. This allows the object to be coated according to its shape.

In FIG. 4, the heat-shrinkable tube 1 has a small amount of light absorption in the portion located at the outer diameter _D1 of the feedthrough capacitor 40 (portion A in the figure), and the amount of light absorption is small in the portion located at the outer diameter _D2 (portion B in the figure). The amount of light absorption in the heat shrink tube 1 is partially reduced so that the amount of light absorption becomes the maximum in the portion (section C in the figure) that causes further heat contraction. It is formed by changing.

Partial changes in the amount of light absorption in such heat-shrinkable materials can be achieved, for example, by applying paints with different light absorption characteristics to the surface of the cover, or by printing a black mottled pattern by changing the density. This can be achieved by Furthermore, it can also be realized by mixing a pigment with a high light absorption effect into the heat-shrinkable material by partially changing the mixing ratio. Alternatively, it may be more convenient to simply color it with quick-drying black ink.

According to the above structure, the heat-shrinkable member, which has different amounts of light absorption in different parts, is heated by light according to the amount of light absorbed in each part by light irradiation, and heat-shrinks depending on the temperature distribution. Shrink at different rates. As a result, even if the shape and dimensions of the object to be coated are partially different from each other as shown in the figure, it is possible to perform the optimum coating treatment that matches the shape of the object to be coated.

Furthermore, in the explanation of the above example, it was assumed that the heat shrinkage of the heat-shrinkable member differs due to local differences in the amount of light absorption. Therefore, the heat shrinkage rate can also be changed.

FIG. 5 is a perspective view showing the appearance of still another example of the coating treatment according to the present invention. In this example, letters, figures, and symbols are written on a heat-shrinkable member using a paint with a large amount of light absorption, and the heat-shrinkage rate of the part is made different from that of the surrounding area. In other words, the electrolytic capacitor 50 as an object to be covered has a structure in which an explosion-proof hole 51 is formed in a part of the top, and the explosion-proof hole 51 is ruptured without the entire electrolytic capacitor 50 rupturing when a voltage higher than the allowable withstand voltage is applied. It's getting old.
The electrolytic capacitor 50, including its top, is covered with a sheath-shaped cover 52 that is a heat-shrinkable member.
A part 53 of the sheath-shaped cover corresponding to the explosion-proof hole 51 at the top is printed with a paint that reduces the thermal shrinkage rate. The thickness of the heat-shrinkable material of the cover portion 53 corresponding to the explosion-proof hole 51 is the thickness of the electrolytic capacitor 5.
It is extremely thinner than the other parts of the cover that cover 0 and is shrinking due to heat. Further, a flat portion 54 is formed on a part of the cylindrical side wall of the electrolytic capacitor 50, and letters, symbols, and figures are written in black paint on the heat-shrinkable member corresponding to the flat portion 54.

The structure described above is formed as follows. First, the electrolytic capacitor 5 is placed in a sheath-like cover 52.
0 is inserted, the cover 52 is irradiated with light from a light source and heated to perform a coating process. At this time, the part 53 of the cover 52 corresponding to the position of the explosion-proof hole 51 of the electrolytic capacitor 50 is printed with a paint that has a low thermal shrinkage rate, so the amount of light absorption is small, and the part 53 shrinks smaller than the surrounding area. do. As a result, the thickness of the cover made of heat-shrinkable material at the painted cover portion 53 can be made thinner, and can also be formed into a ventilation hole.

According to this example, when the electrolytic capacitor 50 is about to burst due to pressure, the explosion-proof hole 51 is torn and at the same time, the thinly covered painted portion 53 is easily torn, which serves to prevent the entire capacitor from bursting. In addition, a portion 55 of characters, figures, and symbols printed on the heat-shrinkable member located on the flat portion 54 provided on the side wall of the electrolytic capacitor 50 thermally shrinks more intensely than the surrounding area due to light absorption. As a result, the characters,
In the figure/symbol portion 55, thick wrinkles or depressions may occur in the heat-shrinkable member.
It has the effect of making displayed characters, figures, and symbols more clearly readable. According to the above-described embodiment, the amount of heat shrinkage of a portion can be adjusted according to characters, figures, symbols, etc.

In addition, in the above explanation, it is assumed that the coating color is used, but the present invention is not limited to this, but it is possible to use a color in the visible range that corresponds to the light wavelength of the light source, or a color that has unique absorption characteristics for ultraviolet light or infrared light. It is also possible to use paint or the like. Also, in the explanation of the above example,
We tried to increase the amount of light absorption by painting black, etc., and increase the amount of heat shrinkage in that area, but on the other hand, we could reduce the amount of light absorption by, for example, printing reflective paint on parts of the area. It is also possible to reduce thermal shrinkage of the shrinkable member. Particularly when the object to be coated has sharp edges, the durability of the coating process can be improved by keeping the coating film thick on those parts.

[Effects of the Invention] As described in detail above, according to the present invention, only the heat-shrinkable member can be intensively heated by radiation heating while appropriately controlling the heating time, so that the object to be coated can be heated efficiently. Coating treatment can be performed without adverse thermal effects. Furthermore, since a plurality of objects to be coated can be heat-treated at the same time and the heat-shrinkable member can be heated relatively uniformly, there is an effect that the heat-shrinkable member can be efficiently shrink-treated uniformly and in large quantities.

[Brief explanation of drawings]

FIG. 1a is a block diagram of the configuration of the first embodiment of the present invention seen from the side, FIG. 1b is a block diagram of the configuration seen from the front, and FIG. 2 is a block diagram showing the configuration of the second embodiment. 3 is a top view showing the configuration of the third embodiment, and FIG. 4 is a side view showing an example in which a heat-shrinkable member is coated on an object whose shape and dimensions are partially different. FIG. 5 is a perspective view showing the appearance of another example in which the amount of heat shrinkage of parts such as letters attached to a heat-shrinkable member is different from that of the surroundings. 1... Heat shrinkable tube, 2... Electric wire, 3... Halogen lamp, 4... Power source, 5... Positioning member,
6...Timer, 7...Reflection mirror, 8...Press contact member, 30...Cylindrical capacitor, 40...Throughout capacitor, 50...Electrolytic capacitor.

Claims (1)

[Scope of Claims] 1. A heat-shrinking apparatus for a heat-shrinkable member, which coats a short heat-shrinkable member onto an object having a wire portion that is susceptible to thermal effects, the apparatus comprising: At least a pair of rod-shaped lamp light sources arranged to sandwich the object and emit heat rays capable of radiant heating of a short heat-shrinkable member attached to the object to be covered; and a lamp light source arranged outside the lamp light sources. a pair of reflective mirrors that reflect the heat rays toward the heat-shrinkable member; and the object to be coated is held immovably in a direction substantially orthogonal to the lamp light source so that the heat-shrinkable member faces the irradiation position of the heat rays. A heat-shrinking device for a heat-shrinkable member, comprising: a holding member; and a timer that controls the light emission time of the lamp light source.