JPS629070Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device, and more specifically, when manufacturing a pallet by joining together a plurality of pallet molded parts made of synthetic resin, the surfaces of the molded parts to be welded and joined are melted. The present invention relates to a heating device that heats the air.

Conventionally, some synthetic resin products are obtained by welding and joining together a plurality of synthetic resin molded parts that are formed by dividing the product into several parts. An example of such a synthetic resin product is a pallet on which cargo is placed for transportation, storage, etc. Due to the complex structure of pallets, it is difficult to mold them in one piece.For this reason, the upper and lower halves are molded separately, the joining surfaces of these parts are then heated and melted, and then the two are assembled in a consistent manner. It is formed by overlapping and welding.

In forming such a pallet, conventionally, a heating plate having a surface that is the same or wider than the planar shape of the half part has been used as a heating device for heating the welding surface of each half part.
Both surfaces of this heating plate were particularly coated with Teflon so that the welding surfaces of the upper and lower halves were brought into contact with each other and directly heated.

However, the inner side of the half portion that is brought into contact with the heating plate, that is, the side to be melted and welded, has a shape in which a plurality of protruding portions are formed, and only the tips of the protruding portions come into contact with the heating plate. Therefore,
The entire surface of the heating plate is not used all the time, and therefore only the Teflon coating that comes into contact with the protruding halves of the heating plate quickly wears out or peels off, causing significant damage and eventually failing as a heating plate. cannot be used.

Generally, the surface portion of the heating plate that comes into contact with the protruding portion of the welding side surface of the half portion of the pallet, in other words, the surface portion of the heating plate that is used is small compared to the entire surface of the heating plate, Therefore, it was extremely uneconomical under the above-mentioned usage conditions. However, it is difficult to Teflon-process only the surface portion of the heating plate that corresponds to the shape of the protrusion, and therefore the entire surface must be treated with Teflon. Even if it were possible to surface-treat only the half portions, the use of the heating plate would be inappropriate when heating an article whose surface shape differs between the two halves.

Therefore, an object of the present invention is to provide a heating device that heats the surface of the protrusion of a pallet molded part having a shape having a plurality of protrusions. An object of the present invention is to provide an economical heating device having a hot plate whose surface is treated only on the portion that comes into direct contact with the heating plate.

To summarize the heating device of the present invention, it is a heating device that heats the tips of a plurality of protruding parts of a synthetic resin pallet molded part, and includes a heating board equipped with a heating source inside, and a plurality of parts attached to the surface of the heating board. It is characterized by comprising a locking device and a plurality of hot plates detachably attached to the surface of the heating board by the locking device, and the hot plates are coated with resin. .

Hereinafter, the heating device of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

1 to 3 show an embodiment of the heating device of the present invention. The heating device of this embodiment includes a heating substrate 10. This heating board 1
0 has a surface area that is the same as or wider than the planar shape of the pallet molded part (the entire surface area on the side to be heated). And this heating board 1
As shown in FIG. 2 and FIG. ) is inserted and applies heat to the heating substrate 10, thereby heating the entirety. Although the heating source is preferably an electric heating element, it is also possible to flow a heating medium such as heated oil through the holes 11.

Furthermore, screw holes 13 are formed on both surfaces 12a and 12b of the heating substrate 10 at positions corresponding to the intersections of the checkerboard stripes. heating board 10
A small rectangular heating plate 14 is arranged on both surfaces 12a and 12b of the heating board 10, and setscrews are provided on the heating plate 14 so as to correspond to the plurality of positions of the screw holes 13 provided on the surface of the heating board 10. An insertion hole 15 is provided.

In the embodiment shown in FIG. 1, the hot plate 14 has a rectangular shape that covers a rectangular area defined by every other four adjacent screw holes 13, and
A set screw insertion hole 15 is provided at the corner of the four screw holes 1.
However, the shape and the position of the set screw insertion hole are not limited to those in the embodiment. That is, the number of locking devices including a set screw and a set screw insertion hole may be equal to or greater than the number of hot plates. The shape of the hot plate 14 and the position of the set screw insertion hole 15 may be changed as appropriate depending on the shape of the heated surface of the pallet molded part. However, in that case, it goes without saying that the set screw insertion hole 15 must be provided at a position corresponding to one of the many screw holes 13 of the heating board 10.

Such a hot plate 14 is provided with a coating layer 16 on its surface to prevent the molten resin from adhering to the surface of the hot plate 14 when a synthetic resin product is brought into direct contact and heated and melted. As such a coating layer, it is preferable to use a fluororesin such as Teflon.

A plurality of hot plates 14 are arranged at arbitrary positions on the heating board 10 according to the shape of the heated surface of the pallet molded part, and then a set screw 17 is inserted into a predetermined screw hole 13 through the set screw insertion hole 15. are screwed together and fixed to each surface 12a, 12b of heating substrate 10. A half portion of the pallet is designated as a pallet molded part P and is indicated by a chain line in FIG. At this time, a recess for accommodating the head of the set screw 17 is formed on the surface of the hot plate 14 so that the large diameter head of the set screw 17 does not protrude from the upper surface of the hot plate 14, in other words, from the surface of the coating layer 16. However, if the set screw 17 is located at a position where it does not come into contact with the heated surface, the head of the set screw 17 may protrude.

As a result, as is clear from the above embodiments, the hot plate 14, which has a coating on its surface and comes into direct contact with the heated surface of the pallet molded part, can be heated only at positions corresponding to the shape of the heated surface of the pallet molded part. In addition, if the coating layer of the heating plate 14 is damaged, the heating substrate 10
Screw hole 13 of , insertion hole 1 for set screw of hot plate 14
5 and a set screw 17, it is possible to replace only the damaged hot plate. Further, it is more preferable to cover the surface of the heating substrate 10 where the heating plate 14 is not provided with a heat insulating material made of glass wool, asbestos, etc., since thermal efficiency will be improved.

What is shown in FIG. 4 is another embodiment of the heating device of the present invention, in which a recess is provided at an appropriate position on the heating substrate 10, and a heating plate 14 is mounted inside the recess.
Good thermal efficiency.

On the other hand, FIGS. 5 and 6 show another embodiment of the heating device of the present invention. However, the heating substrate 10 is the same as that of the embodiment shown in FIGS. 1-3. In the heating device in this embodiment, means for fixing and supporting the hot plate 14 on the heating substrate 10, that is, mutual locking means, are formed completely separately. That is, it is indirectly fixed onto the surface of the heating substrate 10 by a separate member (referred to as a support member) 18 which is directly fixed to the heating substrate 10 by a set screw 17 . To explain this in more detail, the support member 18 directly fixed to the heating board 10 by the setscrew 17 has an inverted L-shape in cross section.

Its one opposing side edge forms an L-shaped cutout step 19 . Further, it is desirable that the heating plate 14 has a thickness such that the coating layer 16 on the surface thereof is located at a higher position than the upper surface of the supporting member 18, but if the supporting member 18 and the set screw 17 do not come into contact with the object to be heated, The hot plate 14 is a support member 18
It may also be lower than the top surface of the set screw.

As a result, the heating plate 14 placed at a predetermined position on the surface of the heating board 10 is supported by two support members placed near the stepped portions 19 on both side edges thereof and fixed to the heating board 10 by the setscrews 17. Each of the 18 flange portions 20 is disposed on the stepped portion 19 of the hot plate 14 and is fixedly supported on the heating substrate 10 by being pressed from above. At this time, the hot plate 14
It is desirable that the dimensions be such that some gap 21 is formed between the side surface of the stepped portion 19 and the opposing side surface of the support member 18. The reason for this is that when the heating substrate 10 and the heating plate 14 are made of different materials (especially when the heating plate 14 has a larger coefficient of thermal expansion), it is necessary to provide an escape for the thermal expansion. Because there is. Therefore, in that such a configuration can be adopted, the embodiment shown in FIGS. 5 and 6 is particularly suitable for the heating plate 14 and the heating substrate 10.
This is suitable when the two are made of different materials such as iron and aluminum, but of course there is no problem even if both are made of the same material. However, in the embodiment shown in FIGS. 1-3, it is preferable that heating substrate 10 and heating plate 14 be formed from materials having substantially the same coefficient of thermal expansion. This is because when materials with different thermal expansion coefficients are used, the amount of deformation will be different.
3 may be misaligned, and even if the deviation is alleviated to some extent by the small gap in the set screw part, in extreme cases, the set screw 17 may become bent or damaged, or the hot plate 14 may become curved. This is because there are times when it gets wet.

As mentioned above, according to the heating device of the present invention,
Since the surface-treated heating plate can be removably placed at any position on the heating board, it can be easily attached to the heated surface of the pallet molded part, especially the heated surface formed by the protruding parts. The hot plates can be arranged correspondingly. Moreover, there is no need to apply resin treatment to the entire surface of one large heating plate as in the past, and if the resin-treated surface is partially damaged, only that part of the heating plate can be replaced. The heating device as a whole can be used very economically.

In addition, in the present invention, there is no need to surface-treat the entire surface of one large heating plate as in the past, and as an additional effect, there is no distortion of the heating board due to the thermal history during coating. It also offers great advantages in manufacturing, such as eliminating the need for a large heating furnace for coating, eliminating the need to handle it, and eliminating the need to attach and detach the heater during surface treatment. .

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the heating device of the present invention, FIG. 2 is a front view of the heating device shown in FIG. 1, and FIG.
The figure is a cross-sectional view of the heating device taken along the - line in FIG. 1, and FIGS. FIG. 6 is a cross-sectional view taken along corresponding parts, and FIG. 6 is a plan view of the heating device of FIG. 4 viewed from above. 10... Heating substrate, 11... Heating source accommodation hole, 1
2a, 12b...Surface, 13...Screw hole, 14...
...Hot plate, 15... Set screw insertion hole, 16... Coating layer, 17... Set screw, 18... Support member, 19... Step portion.

Claims (1)

[Utility Model Claims] (1) A heating device for heating the tips of multiple protruding portions of a synthetic resin pallet molded part, comprising a heating base having an internal heat source, multiple locking devices attached to the surface of the heating base, and multiple hot plates detachably attached to the surface of the heating base by the locking devices, the hot plates being coated with resin. (2) The heating device described in Utility Model Claim 1, characterized in that the number of locking devices is equal to the number of hot plates. (3) The heating device described in Utility Model Claim 1, characterized in that the number of locking devices is greater than the number of hot plates. (4) The heating device described in Utility Model Claim 1, characterized in that the heat source is an electric heating element.