JP5047752B2 - Pallet for heat insulation box manufacturing - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a pallet for manufacturing a heat insulating box that places and transports a work used in a manufacturing process of a heat insulating box applied to a commercial refrigerator or freezer.

  Insulation boxes applied to commercial refrigeration / freezers used in restaurants, restaurants, refrigerator trucks, etc., mainly form a foam insulation wall inside a metal shell such as stainless steel plate (for example, SUS304). By this, it has the structure which comprised one or several accommodating space enclosed by the foam heat insulation wall inside.

  In such a heat insulating box, an inner mold having a shape corresponding to each housing space is inserted and arranged in the outer shell, and a foam heat insulating material is injected into the space between the outer shell and the inner mold to form a foam heat insulating wall. (For example, refer to Patent Document 1 and Patent Document 2). In Patent Document 1, it is possible to form a urethane foam heat insulating material by suppressing the occurrence of cavitation by injecting a mixed stock solution immediately after mixing two predetermined stock solutions between an outer box and an inner box. Are listed. Patent Document 2 describes that a foam insulation is formed by injecting a foaming stock solution inside after preheating in a preheating chamber and a foaming chamber in a state where a core is mounted on a box.

  In the process of manufacturing this type of heat insulation box, conventionally, since the workpiece used in the process of manufacturing a heat insulation box such as an outer shell has a large external dimension and weight, a plywood having a thickness of 8 to 10 mm on the conveyor is used. A transport pallet is arranged, and a workpiece is placed on the transport pallet and transported to each step.

The structure of the transport pallet consists of a loading plate, a bottom plate, and leg portions between them, and a positioning step on the loading plate, or positioning on both sides of the loading plate. There is known one provided with a fixed plate (see, for example, Patent Document 3). In addition, it is also known that a non-slip member made of a synthetic resin, which is a combination of a soft resin jacket member and a hard resin base member, is mounted on a recess or hole formed in the deck portion of the pallet. (For example, refer to Patent Document 4).
JP-A-11-199696 JP 2005-319584 A JP 2000-118533 A Japanese Patent No. 3896279

  However, when a workpiece is positioned and placed on a transport pallet made of plywood by a robot and transported by a conveyor, there is a problem that the position may be displaced due to vibration or the like during transport and may be damaged by impact. It was. Therefore, it is necessary to place a positioning sensor and positioning jig and perform positioning again immediately before entering the foam molding part where the outer shell and the inner mold are combined and the foam raw material is injected into the space between them and foam molding is performed. Yes, it is an impediment to productivity improvement.

  Moreover, in the pallet structure described in Patent Document 3, since the positioning protrusion protrudes on the mounting surface for preventing displacement, the structure is complicated and the workpieces of various dimensions are placed and conveyed. In the case of the pallet structure described in Patent Document 4, if the anti-slip member does not protrude, the anti-slip effect is not sufficiently secured, and if it protrudes locally, the bottom surface of the work is uneven. There is a problem that there is a fear.

  In view of the above-described conventional problems, the present invention can place a workpiece of any size, can reliably prevent misalignment during conveyance, and can omit the positioning step immediately before the foam molded portion. An object of the present invention is to provide a pallet for manufacturing a heat insulation box capable of manufacturing a heat insulation box with high productivity.

The pallet for manufacturing a heat insulating box of the present invention is a pallet for manufacturing a heat insulating box that transports the work used in the manufacturing process of the heat insulating box placed on the mounting surface of the pallet, the top surface of the pallet main body. to, paste the slip sheet made of a synthetic leather made by filling a porous synthetic resin nonwoven fabric constitute a mounting surface, the slip sheet before with an adhesive only its peripheral portion over substantially the entire periphery Adhered to the placement surface, the workpiece is positioned and placed on the placement surface and heated to foam the foam insulation wall of the heat insulation box, and the anti-slip sheet contracts to finish the foam molding After that, even if the work is touched by the occurrence of wrinkles on the non-slip sheet, it can be confirmed that the work has been cooled to a safe temperature .

According to this configuration, when the anti-slip sheet is bonded to the mounting surface with an adhesive only over the entire periphery, the foamed sheet is exposed to high temperature and contracts after the foam molding is completed. When the sheet is cooled to about 30 ° C, the non-slip sheet is stretched and wrinkles are generated. By visually observing the generation of wrinkles on the non-slip sheet, it can be confirmed that the work has been cooled to a safe temperature by touching the work. It is possible to easily ensure the safety of work in subsequent processes such as the component mounting process. A non-slip sheet made of synthetic leather is affixed to the top surface of the pallet body to form a placement surface, so that there is no positioning protrusion on the placement surface, and a workpiece of any size is placed. Synthetic leather anti-slip sheet has an appropriate cushioning property and a high coefficient of friction, so if a workpiece is positioned and placed on a pallet by a robot, it will be subjected to vibrations and impacts during its subsequent transfer. Further, the occurrence of misalignment can be prevented, and as a result, the positioning step immediately before the foam molded part can be omitted, so that the productivity of manufacturing the heat insulating box can be improved.

Further, the anti-slip sheet has a thickness of 1.5 to 2.5 mm and a coefficient of friction with respect to the metal plate of 0.5 to 0.8. 10 kg / m dent occurs about 0.1~0.2mm ² approximately of the weight of the workpiece mounted state, the friction coefficient of the range in the state of that that acts, when in the transport and movement and positioning Therefore, it is possible to reliably prevent the occurrence of the positional deviation of the workpiece due to the vibration or impact of the workpiece.

According to the pallet for manufacturing a heat insulating box according to the present invention , the pallet for manufacturing a heat insulating box is a pallet body for transferring a work used in the manufacturing process of the heat insulating box by placing the work on the mounting surface of the pallet. A non-slip sheet made of synthetic leather filled with porous synthetic resin in a non-woven fabric is attached to the upper surface of the sheet to constitute a mounting surface, and only the peripheral edge of the non-slip sheet is used as an adhesive over the entire circumference. Is bonded to the mounting surface, and the workpiece is positioned and placed on the mounting surface and heated to foam the foam heat insulating wall of the heat insulating box, and the anti-slip sheet contracts and the foam molding is performed. After completion, visually check for the occurrence of wrinkles on the non-slip sheet because it can be confirmed that the anti-slip sheet has cooled to a safe temperature even if the work is touched by hand. Touch the work with Can also be confirmed that was cooled to a safe temperature, easily ensure the safety of working in a subsequent process, such as the component mounting process. Since the mounting surface is composed of a synthetic leather non-slip sheet, a workpiece of any size can be mounted, and it has an appropriate cushioning property and a high coefficient of friction. It is possible to prevent the occurrence of displacement even when subjected to vibration or impact during conveyance, and as a result, the positioning step immediately before the foam molded part can be omitted, so that the productivity of heat insulating box manufacturing can be improved. it can.

  Hereinafter, an embodiment of a pallet for manufacturing a heat insulating box according to the present invention will be described with reference to FIGS.

  In FIG. 1, in the manufacturing process of the heat insulation box, the outer shell 2 of the heat insulation box 1 (see FIG. 3 (e)) is placed on a pallet 4 and conveyed on a predetermined conveyance path. The pallet 4 is configured by attaching a non-slip sheet 6 made of synthetic leather to the upper surface of a synthetic resin pallet body 5, and the upper surface of the anti-slip sheet 6 constitutes a mounting surface of the outer shell 2. The synthetic leather constituting the anti-slip sheet 6 is formed by filling a non-woven fabric with porous urethane, and one having a thickness of about 1.5 to 2.5 mm is suitably applied. Further, as the synthetic leather, those having a coefficient of friction of about 0.5 to 0.8 against the metal plate are suitably applied. Further, the non-slip sheet 6 is arranged so that one or several sheets are arranged in parallel so as to cover almost the entire surface of the pallet body 5, and only the peripheral edge of the sheet material is urethane-bonded over the entire circumference. It is bonded to the upper surface of the pallet body 5 with an agent.

  The whole schematic structure of the manufacturing equipment of the heat insulation box 1 is demonstrated with reference to FIG. In the outer assembly part 11, the outer shell 2 of the heat insulating box 1 to be manufactured is assembled and manufactured, and the manufactured outer shell 2 is positioned and placed on the pallet 4 by a robot (not shown) and transported in that state. It is conveyed toward the preheating unit 13 by the conveyor 12. Further, the jig 10 constituting the inner mold corresponding to the heat insulating box 1 to be manufactured at the jig station 14 is selected and placed on the jig pallet 7 dedicated to the jig, and is placed on the jig transport conveyor 15. Then, it is transported to a position before the preheating unit 13 and joined to the transport conveyor 12. Next, in the preheating unit 13, the outer shell 2 and the jig 10 are heated at an ambient temperature of 45 to 60 ° C. for about 30 minutes. Next, the preheated jig 10 and the outer shell 2 are fed into the foam molding part 16. First, the jig 10 is sent, supported and lifted by a jig fixing portion (not shown), set inside an external mold (not shown) provided in advance, and the jig pallet 7 is in a standby position. Evacuate to. Next, the outer shell 2 placed on the pallet 4 is sent to the foam molding unit 16, the pallet 4 is raised by the lifting mechanism, and the outer shell 2 is set between the outer mold (not shown) and the jig 10. The outer surface of the outer shell 2 is positioned by the outer die, and the inner die is formed by expanding the jig 10. The outer mold (not shown) is made of an aluminum casting and has a built-in coil through which hot water of 40 to 42 ° C. flows and is constantly heated. Thereafter, the foaming raw material is injected into the space between the outer shell 2 and the inner mold, the foam heat insulating wall 3 is formed, and the heat insulating box 1 is manufactured.

  Thereafter, the jig 10 is contracted to release the inner mold, and then the heat insulating box 1 manufactured together with the pallet 4 is lowered by the lifting mechanism, and the heat insulating box 1 is transferred to the component assembly unit 18 by the transfer conveyor 17. Products such as a refrigerator are manufactured by assembling parts to the heat insulating box 1. The pallet 4 is returned to the outer assembly part 11 by the return conveyor 19. Further, the jig 10 is used as it is when continuously used, and when it is replaced with another model, the jig 10 is placed on the jig pallet 7 in a standby state, and is fixed on the jig return conveyor 20. Returned to station 14. By repeating the above operation, the heat insulation box 1 is sequentially manufactured to manufacture a product.

  The operation of the foam molded part 16 will be described in more detail with reference to FIGS. In this example, the jig 10 for forming the inner mold is a combination of a plurality of core jigs 10a and a partitioning jig 10b inserted between the core jigs 10a and 10a as necessary. It is comprised so that it can respond to the arrangement | positioning structure of the various accommodation space in the heat insulation box 1 which should be manufactured. In the foam molding part 16, as shown in FIG. 3A, the core jig 10 a and the partitioning jig 10 b are previously suspended from the jig fixing part 21. The outer shell 2 installed on the transport pallet 4 is transported to the foam molding part 16 in this state. Then, as indicated by the white arrow, the outer shell 2 is positioned immediately below the jig 10 and then raised.

  While the outer shell 2 rises, as shown in FIG. 3B, the lower surface forming member 22 moving downward by its own weight in the partitioning jig 10b abuts on the bottom surface of the outer shell 2, and thereafter, the white arrow As shown, the lower surface forming member 22 is lifted up. As shown in FIG. 3C, the outer shell 2 temporarily stops at the position when the lower surface forming member 22 of the partitioning jig 10b is raised to a position in the vicinity of the setting position at the time of molding. In conjunction with the ascending operation of the lower surface forming member 22, the side surface forming member (not shown) of the partitioning jig 10b also projects and moves toward the setting position during molding.

  Thereafter, the core jig 10a is expanded, and the peripheral surface forming member 23 is projected and moved from the retracted position to the setting position at the time of molding as indicated by the white arrow, thereby, as shown in FIG. The peripheral surface forming member 23 of the core jig 10a is positioned at the normalizing position at the time of molding, and the pressed portion 24 of the partitioning jig 10b is pressed by this operation of the peripheral surface forming member 23, and the lower surface forming member 22 is pressed. Is pulled up to the setting position at the time of molding, and the position is adjusted, and accordingly, the side surface forming member (not shown) of the partitioning jig 10b is also positioned at the setting position at the time of molding. Thus, the inner mold is formed by the core jig 10a and the partition jig 10b.

  Thereafter, as shown by the white arrow in FIG. 3D, the outer shell 2 is lowered by a predetermined distance, and the lower surface forming member 25 of the core jig 10a and the lower surface forming member 22 of the partitioning jig 10b and the outer shell 2 Position and stop at a position corresponding to the thickness dimension of the foam insulation wall 3 to be formed between the bottom and the bottom surface, and in that state, foam insulation is placed in the space between the inner mold and the outer shell 2. By foaming by injection, the foam heat insulating wall 3 is formed so as to form a required accommodation space.

  When the foam heat insulating wall 3 is molded, the core jig 10a is contracted to move the peripheral surface forming member 23 from the normalizing position during molding to the retracted position, and then the outer shell 2 is lowered. Die-cutting is performed smoothly without difficulty, and the manufactured heat insulation box 1 is placed on the pallet 4 and taken out from the foam molding part 16.

  As described above, according to this embodiment, the pallet 4 on which the outer shell 2 is placed is attached to the upper surface of the pallet main body 5 with the anti-slip sheet 6 made of synthetic leather to constitute the mounting surface. Since there is no positioning projection on the mounting surface, the outer shell 2 of any size corresponding to the heat insulating box 1 of various specifications can be mounted. Moreover, since the anti-slip sheet 6 made of synthetic leather has an appropriate cushioning property and a high coefficient of friction, if the outer shell 2 manufactured by the outer shell assembly portion 11 is positioned and placed on the pallet 4 by a robot, then the conveyor 12 It is possible to reliably prevent the displacement of the outer shell 2 on the pallet 4 from being displaced even if it is subjected to vibration or impact while being transported and when it is moved and positioned in the preheating part 13 and the foam molding part 16. . As a result, as in the prior art, the step of positioning the outer shell 2 by disposing the position detection sensor and the position adjusting means immediately before or after the foam molding portion 16 can be omitted. Productivity in the manufacturing process can be improved.

In particular, when the non-slip sheet 6 is 1.5 to 2.5 mm thick, 0.1 to 0 in a state where the outer surface 2 having a lower surface area of 1 to ³ m ² and an average weight of about 35 kg is placed. Since a dent of about 2 mm occurs and the coefficient of friction against the metal plate, that is, the outer shell 2 is 0.5 to 0.8, the outer shell 2 on the pallet 4 is transported by the conveyor 12 as described above. It is possible to reliably prevent the positional deviation from occurring . The pre heat section 13 and the foam molding portion 16, is heated to a temperature of 45 to 60 ° C..

  Further, since the anti-slip sheet 6 is only bonded to the upper surface of the pallet body 5 with an adhesive over almost the entire periphery, the anti-slip sheet 6 is temporarily exposed to high temperatures in the foam molding part 16. It contracts and becomes a state of being stuck in a tension state. Thereafter, after foam molding is completed, when the outer shell 2 and the pallet 4 are cooled to about 30 ° C. when being transported to the component assembly unit 18 and performing assembly work, the anti-slip sheet 6 extends and the anti-slip sheet 6 Will occur. Therefore, by visually observing the occurrence of wrinkles on the non-slip sheet 6, it is possible to confirm that the outer shell 2 has been cooled to a safe temperature even if the outer shell 2 is touched. Can be easily secured.

  Since the mounting surface of the pallet for manufacturing the heat insulating box of the present invention is composed of a synthetic leather non-slip sheet, a workpiece of any size can be mounted, and an appropriate cushioning property and high friction can be provided. Since it has a coefficient, it can be prevented that displacement occurs even if it receives vibration or impact while the work is placed and transported. As a result, the positioning process immediately before the foam molding part can be omitted, and the heat insulation box manufacturing can be performed. Since productivity can be improved, it can be useful for the manufacture of a heat insulating box.

The perspective view of the use condition of the pallet for heat insulation box manufacture of one embodiment of the present invention. The schematic block diagram of the manufacturing equipment of the heat insulation box of the embodiment. Operation | movement explanatory drawing in the foaming molding part of the embodiment.

Explanation of symbols

1 heat insulation box 2 outer shell 4 pallet 5 pallet body 6 non-slip sheet

Claims (2)

A heat-insulating box manufacturing pallet that transports workpieces used in the heat-insulating box manufacturing process by placing them on the surface of the pallet, and filling the upper surface of the pallet body with porous synthetic resin. A non-slip sheet made of synthetic leather is attached to form a mounting surface, and only the peripheral edge of the non-slip sheet is adhered to the above-described mounting surface with an adhesive over almost the entire circumference, and the above-described mounting surface After the workpiece is positioned, placed and heated, the foam insulation wall of the heat insulation box is foam-molded, and the anti-slip sheet contracts and the foam molding is finished. A pallet for manufacturing a heat-insulating box body, which can confirm that the workpiece has been cooled to a safe temperature even if it touches the work .   The pallet for manufacturing a heat insulating box according to claim 1, wherein the non-slip sheet has a thickness of 1.5 to 2.5 mm and a coefficient of friction with respect to the metal plate of 0.5 to 0.8.

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