JP2001006858A - Heating plate with surface elasticity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring a heating part into direct contact with a surface to be worked to heat even if a work has complicated and/or irregular shapes by densely installing many heating pins capable of expanding and contracting and energized to the tip side by elasticity of a spring on one side of the surfaces of a heating plate heating part including a heater acting as a heating element and a temperature sensor for temperature control. SOLUTION: Many heating pins with springs are installed in a grid shape at equal intervals on one side of the surfaces of a heating part of a heating plate 1 including a heater 4 having suitable capacity acting as a heating element and a temperature sensor for temperature control. For example, heating pins having a maximum outer diameter of 2 mm are arranged 50 pieces in the length direction and 13 pieces in the width direction in a grid shape at 3.4 mm intervals on the surface of a heating part excluding peripheral parts acting as insertion parts of the heater 4 of the 21 mm × 70 mm, for example, and the temperature sensor 5, and the fixing part of feet 9. The heater 4 and the temperature sensor 5 are connected to a temperature control device to control the temperature in a set value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of an electric heating apparatus, and more particularly, to a heating plate for heating a heating portion by directly contacting the heating portion with a work having an irregular shape.

[0002]

2. Description of the Related Art When it is desired to uniformly heat the surface of a complex-shaped body, an indirect heating means using a fluid as a medium or a direct heating means in which a heating portion is brought into contact with a work include a work shape incorporating a heating element. Matching mold or flexible sheet heater (silicon rubber heater, etc.)
Means such as covering with conceivable.

[0003] However, indirect heating using a fluid has a problem in that heating efficiency is poor, for example, it takes time to raise the temperature, and it is difficult to apply the method when only a part of a work is locally heated.

On the other hand, regarding the direct heating means, when using a mold, the optimal heating means is obtained if the workpiece has a fixed shape, but the size and shape are almost the same as those of an irregularly shaped object such as a vegetable. Even if there is any difference, it cannot be applied to ones with different shapes, and only one mold is applied to one work. There is a problem such as poor sex. In addition, regarding the flexible sheet heater,
When a workpiece having a complicated shape is heated, the contact pressure on the heated portion becomes unstable, and the unevenness of the contact portion and the non-contact portion increases, so that satisfactory uniform heating is questionable.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method of manufacturing a workpiece having a complicated and / or irregular shape along a surface to be heated, as long as the heated portion of the workpiece is in a shape that satisfies certain conditions. It is an object of the present invention to provide a heating plate which enables heating by directly contacting a heat-generating portion and can set a work heating portion to a uniform temperature condition.

[0006]

Means for Solving the Problems The heating plate of the present invention has a spring over the entire surface of a heating plate heating section including a heater serving as a heating element and a temperature sensor for temperature control, and is extensible by the spring elasticity. And a large number of heating pins urged to the tip side are densely arranged, and the workpiece heated surface presses the tip of the heating pin, and each pin corresponds to the workpiece shape. By independently shortening, the structure is such that the tip of the heating pin contacts the work surface to be heated, along the work shape.

[0007] More preferably, the entire surface of the front end of the heating pin serving as the surface of the heating plate is covered with an elastic thin film sheet.

[0008]

According to the above-mentioned means, even when the heated portion has a complicated irregular shape, the tip of the heating pin serving as the surface of the heating plate can directly contact along the shape of the heated portion, and the state of the contact can be reduced. Uniform multi-point contact is achieved over the entire surface of the portion to be heated, as if by surface contact with a mold. Heating unevenness due to contact and non-contact can be minimized, and as a result, the workpiece heating portion can be heated evenly.

Further, by the above-mentioned operation, even if the shape of the workpiece is changed, the heating plate can be heated even if the shape of the workpiece is changed as long as the workpiece has a similar shape (the size of the heating surface and the depth of the unevenness) within a certain range. It is possible to provide a versatile heating plate that does not need to be changed.

Further, by covering the surface with the thin film sheet, it is possible to make surface contact along the surface of the work, instead of multipoint contact by the tips of a large number of heat generating pins, so that it is possible to further improve the heat uniformity.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating plate according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of an example of the heating plate of the present invention.
FIG. 2 shows a top view. A large number of heating pins 2 provided with springs 3 are densely and evenly spaced on the entire surface of a heating portion of a heating plate 1 on which a heater 4 having an appropriate capacity as a heating element and a temperature sensor 5 for temperature control are inserted. It was arranged in a shape and configured.
In the embodiment, a maximum outer diameter of 2 m is provided on the surface of the heating portion excluding the heater 4 having a heating plate of 210 mm × 70 mm, the insertion portion of the temperature sensor 5 and the peripheral portion serving as the attachment portion of the leg 9.
50 heating pins 2 of length m and 13 in the width direction were arranged in a grid at intervals of 3.4 mm. (The drawing is drawn without the number of heating pins for simplicity.)
The temperature sensor 5 is connected to a temperature control device (not shown) and is controlled at a set temperature.

FIG. 3 shows an example of the heating pin 2 having spring elasticity according to the present invention. The spring 3 is loaded from the base 22 and stopped at the tip step 23 as a two-stage cylindrical shape in which the outer diameter of the tip 21 serving as a contact portion with the work has a larger outer diameter than the base 22. In the embodiment, the tip 24 has a spherical surface. The material of the heating pin 2 includes thermal conductivity, strength,
A metal material having heat resistance or the like, such as copper, may be used. In the embodiment, a nickel-plated brass product is used in consideration of the above-described characteristics and economy. As a material of the spring 3, Inconel (stainless steel) was selected as a material having heat resistance and appropriate elasticity.

FIG. 4 is a sectional view showing a means for attaching the heating pin 2 to the heating plate 1. As shown in FIG. Two-stage through holes 7 having different outer diameters are provided at the heating pin 2 mounting portion on the hot plate surface, that is, the upper portion of the heating plate 1 has an outer diameter through which the spring 3 is inserted, and the lower portion has only the shaft 22 of the heating pin 2. Is inserted, and the spring 3 is provided with a diameter that stops and is held at the step portion. For attachment to the heating plate 1, the heating pin 2 provided with the spring 3 is inserted into the hole 7, and a portion of the bottom of the heating pin 2 protruding from the heating plate 1 is fixed by caulking with the fixing plate 6.

FIG. 5 shows another embodiment of the present invention. The entire surface of the tip of the heating pin 2 serving as the heating plate surface is covered with an elastic thin film sheet 8.

As a preferred use example of the present invention, an irregular-shaped object such as a vegetable is packaged in a film-like packaging material, and when the cut end of the packaging material is sealed, the cut end is heated and welded by the present heating plate to be sealed. Applications such as stopping are assumed.

[0017]

According to the heating plate having elasticity of the present invention, as described above, due to the contact pressure of the work, the heat generation pin is reduced along the work shape, the surface of the heat generation plate is freely made to correspond to the shape, and Multi-point contact close to contact, minimizing heating unevenness due to contact and non-contact with the work surface enables uniform supply of heat over the entire heated part of the work, resulting in failure due to uneven work heating. Can be eliminated. Further, when a thin film elastic sheet covering the heating tip surface of the heating pin is provided, the contact with the work is changed from the point contact to the surface contact, so that the uniform heating effect can be further enhanced and the heating condition of the work can be further stabilized. .

Furthermore, within a certain shape range (size and unevenness), even if the work is changed, it is economical because it can be used for a general purpose without requiring a specific mold depending on the shape.

[Brief description of the drawings]

FIG. 1 is a front view of a heating plate showing an embodiment of the present invention.

FIG. 2 is a top view of a heating plate showing an embodiment of the present invention.

FIG. 3 is a structural view showing a heating pin according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a means for attaching a heating pin to a hot plate according to the embodiment of the present invention.

FIG. 5 is a front view of a heating plate showing another embodiment of the present invention.

[Explanation of symbols]

 1. Heating plate 2. Heating pin 3. Spring 4. Heater 5. Temperature sensor 6. Fixing plate 7. Hole 8. Seat 9. leg

Claims (2)

[Claims] 1. A heating plate for heating a heating section by directly contacting the heating section with a surface of a heating section of a work having an irregular shape,
A spring 3 is provided on the entire surface of the heating plate 1 on which a heating element is incorporated.
A heating plate having surface elasticity, wherein a large number of heating pins 2 urged toward the distal end by the spring elasticity are densely arranged. 2. A heating plate having surface elasticity according to claim 1, wherein the entire surface of said plurality of heat generating pins is covered with a thin elastic sheet.