KR100339584B1 - Vaccum forming apparatus for inner case of refrigerator - Google Patents

Abstract

The present invention relates to a vacuum forming apparatus for a refrigerator inner case, comprising: a vacuum molding mold for vacuum forming an inner case sheet of a refrigerator to be molded; At least one upper heater and a lower heater disposed parallel to each other with respect to the transfer plane of the sheet, with the sheet interposed therebetween before the vacuum forming mold; At least one reflection disposed on at least one side of the upper heater and the lower heater along the conveying direction of the sheet to reflect thermal energy emitted from the heating space between the upper heater and the lower heater and the sheet to the heating space; And a member. Thereby, the vacuum forming apparatus for the refrigerator inner case which can reduce the variation of the molding thickness and can suppress the heat loss of the side part is provided.

Description

Vacuum forming apparatus for refrigerator inner case {VACCUM FORMING APPARATUS FOR INNER CASE OF REFRIGERATOR}

The present invention relates to a vacuum forming apparatus for a refrigerator inner case, and more particularly, to a vacuum forming apparatus for a refrigerator inner case which can reduce the variation in the molding thickness of the inner case and can suppress the heat loss of the heater. .

1 is a view schematically showing the structure of a conventional vacuum forming apparatus for a refrigerator inner case, and FIG. 2 is a schematic perspective view of the heater region of FIG. 1. As shown in these figures, the conventional vacuum forming apparatus, respectively, is arranged along the conveying direction of the sheet 135 to be the inner case of the refrigerator and heats the sheet 135 first and second. The second heating parts 111 and 121, the vacuum molding mold 131 for vacuum forming the sheets 135 heated by the heating parts 111 and 121, and the heated sheet 135 are downwardly directed to the vacuum molding mold 131. It has a plug 133 disposed above the vacuum forming mold 131 to pressurize.

The first heater 111 and the second heater 121 are plate heaters 112a and 122a respectively disposed on the upper side and the lower side of the sheet 135 in the vertical direction with the sheet 135 interposed therebetween. And lower heaters 112b and 122b, respectively, and the upper and lower heaters are configured of a plurality of heater cells 113 to enable local temperature control.

By this configuration, the sheet 135 provided as the first heating unit is heated to a predetermined temperature by the upper heater 112a and the lower heater 112b, and is provided to the second heating unit 121. The second heating part 121 is heated to a degree capable of vacuum molding (usually 20 to 40 ° C. or higher than the glass transition temperature of the resin), and then transferred to the vacuum molding mold 131.

The sheet 135 transferred to the vacuum molding mold 131 is pressurized downward into the vacuum molding mold 131 by the plug 133 disposed above. After the edge region is fixed to the upper opening region of the vacuum molding mold 131, the sheet 135 is vacuum-absorbed by the vacuum molding mold 131 to be molded into an inner case.

However, in the conventional vacuum forming apparatus for a refrigerator inner case, the plate-shaped upper heaters 112a and 122a and the lower heaters 112b and the upper and lower sides of the sheet 135 are substantially parallel to the transfer plane of the sheet 135. 122b) is arranged to heat the sheet 135, so that the edge region of the sheet 135 has a large energy loss due to the angle compared to the center region, and heat loss due to contact with the outside air is increased. It will happen a lot.

As a result, the edge region has a relatively low temperature compared with the center region, resulting in uneven molding thickness. Due to this, in the edge region or the side region of the sheet 135, a crack may be generated due to concentration of external stress, and the trimming operation is difficult.

Accordingly, it is an object of the present invention to provide a vacuum forming apparatus for a refrigerator inner case which can reduce a variation in molding thickness and can suppress heat loss of side portions.

1 is a view schematically showing the structure of a vacuum forming apparatus for a conventional refrigerator inner case;

FIG. 2 is a schematic perspective view of the heater region of FIG. 1;

3 is a schematic perspective view of main parts of a vacuum forming apparatus for a refrigerator inner case according to an embodiment of the present invention;

4 is a partially enlarged exploded perspective view of the reflective member of FIG. 3;

5 is a view for explaining an operation state of the reflective member of FIG.

Explanation of symbols on the main parts of the drawings

12a: Upper heater 12b: Lower heater

13 heater cell 35 seat

41: reflection member 43: rotating shaft

44a: upper reflecting portion 44b: lower reflecting portion

45 hinge portion 47 reflector support portion

49: reflector 50: adjustment knob

The object is, according to the present invention, a vacuum molding mold for vacuum molding the inner case sheet of the refrigerator to be molded; At least one upper heater and a lower heater disposed parallel to each other with respect to the transfer plane of the sheet, with the sheet interposed therebetween before the vacuum forming mold; At least one reflection disposed on at least one side of the upper heater and the lower heater along the conveying direction of the sheet to reflect thermal energy emitted from the heating space between the upper heater and the lower heater and the sheet to the heating space; It is achieved by a vacuum forming apparatus for a refrigerator inner case characterized in that it comprises a member.

Here, the reflecting member, the rotation axis disposed in parallel to the conveying plane of the sheet, and the heat energy is disposed so as to be extended upward relative to the rotation axis and can be rotated relative to the upper region of the sheet to the upper side of the sheet It is preferable to include an upper reflecting portion to be re-reflected, and a lower reflecting portion which is arranged to extend downwardly and relatively rotatable with respect to the rotational axis and reflects heat energy reflected from the lower region of the sheet to the lower side of the sheet.

And, it is effective to further include a reflection angle adjusting means for adjusting the respective reflection angles of the upper reflection portion and the lower reflection portion with respect to the sheet.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

3 is a schematic perspective view of a main portion of a vacuum forming apparatus for a refrigerator inner case according to an embodiment of the present invention, FIG. 4 is a partially enlarged exploded perspective view of the reflective member of FIG. 3, and FIG. 5 is an action of the reflective member of FIG. 3. It is a figure for demonstrating a state. As shown in these figures, the present vacuum forming apparatus, the first heating portion 11 and the first heating portion 11 which is arranged to be spaced apart from each other along the conveying direction of the sheet 35 to be formed into a refrigerator inner case, respectively, A plurality of reflecting members (not shown) and a plurality of reflecting members disposed at both side regions of the first heating unit 11 and the second heating unit to reflect back the heat energy reflected from the sheet 35 to the sheet 35 ( 41 and a vacuum molding mold (not shown) for vacuum molding the sheet 35 heated by these heating parts 11 and the reflecting member 41. Here, since the second heating part is almost identical in configuration to the first heating part, the second heating part will be described with reference to the first heating part 11.

The first heating unit 11 has a plate-shaped upper heater 12a and a lower heater 12b respectively disposed on the upper side and the lower side with the sheet 35 therebetween, and each of the upper heater 12a and the lower heater ( 12b) is composed of a plurality of heater cells 13 to heat the sheet 35 so that the temperature can be locally controlled.

On the other hand, a pair of reflecting members 41 are provided in both side regions of each heating section along the conveyance direction of the sheet 35. Each of the reflecting members 41 has a rotation shaft 43 which is horizontally installed in the center region of the upper heater 12a and the lower heater 12b along the conveying direction of the sheet 35, and the rotation shaft 43 An upper reflecting portion 44a arranged to extend upward and reflecting the heat energy reflected from the sheet 35 back to the sheet 35 and a heat energy disposed to extend downward with respect to the rotation shaft 43 and reflected from the sheet 35. It is comprised by the lower reflection part 44b which reflects back to the sheet | seat 35. FIG.

The upper reflecting portion 44a and the lower reflecting portion 44b include a plurality of hinge parts 45 coupled to each other so as to be able to move relative to the pivot shaft 43 and a reflecting mirror extending radially from the hinge part 45. It has a support part 47 and a reflector 49 which has a reflecting surface and is accommodated in the reflector support part 47 and reflects heat energy from the sheet 35.

The hinge portion 45 of the upper reflection portion 44a and the hinge portion 45 of the lower reflection portion 44b are coupled to be alternately disposed along the axial direction of the pivot shaft 43, and these hinge portions ( 45) and the rotation shaft 43 is coupled with a constant fastening to each other to allow the angle adjustment. Behind each reflecting mirror 49, by adjusting the rotation angles of the upper reflecting portion 44a and the lower reflecting portion 44b with respect to the rotation axis 43, so as to adjust the radiation angle of the thermal energy from the sheet 35. The adjusting knob 50 is formed.

By this configuration, part of the radiant energy radiated by each heater cell 13 is absorbed by the sheet 35, and part is emitted to the outside as reflected energy. Some of the energy emitted to the outside is reflected back to the sheet 35 by each reflecting member 41 provided in the side regions of the upper heater 12a and the lower heater 12b to raise the temperature of the sheet 35. . At this time, by adjusting the angle of each reflecting mirror 49 with respect to the sheet 35 by the adjustment knob 50 provided behind each reflecting mirror 49, the reflection of the sheet 35 by each reflecting mirror 49 is carried out. It is possible to adjust the energy absorption position.

In the above-described and illustrated embodiments, a case in which a single rotating shaft is disposed in the center region of the upper heater and the lower heater and the upper reflecting portion and the lower reflecting portion are configured to be relatively rotatable on the rotating shaft, is described as an example. Of course, it is possible to install a separate rotating shaft each of the upper and lower reflecting portion.

In the above-described and illustrated embodiments, the case in which the pivot shaft is provided along the sheet conveying direction in the center region of the upper heater and the lower heater and the upper reflector and the lower reflector are configured on each pivot shaft is described as an example. A single reflector may be installed to block both sides of the heater and the lower heater.

As described above, according to the present invention, by providing a reflecting member to reflect some of the energy reflected by the sheet and emitted to the sheet in the side regions of the upper heater and the lower heater, the heat loss of the heater can be suppressed. In addition, there is provided a vacuum forming apparatus for a refrigerator inner case which can reduce the variation in the molding thickness of the sheet.

In the vacuum forming apparatus for a refrigerator inner case according to the present invention, the molding thickness deviation of the sheet peripheral region can be reduced to facilitate the trimming operation after molding.

Claims (3)

A vacuum forming mold for vacuum forming the inner case sheet of the refrigerator to be molded; At least one upper heater and a lower heater disposed parallel to each other with respect to the transfer plane of the sheet, with the sheet interposed therebetween before the vacuum forming mold; At least one reflection disposed on at least one side of the upper heater and the lower heater along the conveying direction of the sheet to reflect thermal energy emitted from the heating space between the upper heater and the lower heater and the sheet to the heating space; Refrigerator inner case vacuum forming apparatus comprising a member. The method of claim 1, The reflecting member may include a rotation shaft disposed parallel to the transfer plane of the sheet and heat energy reflected from an upper region of the sheet to be extended upwardly and relative to the rotation shaft and reflected from the upper region of the sheet. And an upper reflecting portion, and a lower reflecting portion extending downwardly and relatively rotatable with respect to the rotational shaft to reflect back the heat energy reflected from the lower region of the sheet to the lower side of the sheet. Vacuum forming apparatus. The method of claim 2, And a reflection angle adjusting means for adjusting each reflection angle of the upper reflection portion and the lower reflection portion with respect to the sheet.