JP4845115B2 - Dunedge and vacuum mold for dunnage - Google Patents

Description

  The present invention relates to a dunnage in which a thermoplastic resin sheet is partially swollen downward to form a plurality of hollow swollen portions, and a load is accommodated in the hollow swollen portions from the upper surface side, and a vacuum for the dunnage It relates to a mold.

Conventionally, when this type of dunnage is stacked in a state in which a load is accommodated, the lower dunnage's load comes into contact with the lower surface of the upper dunnage and the dunnages are held at a fixed interval, and do not contain the load. It is known that when stacked in a state, the upper and lower dunnages are partially in contact with each other and held at a constant interval (see, for example, Patent Document 1). Also, in order to lift and convey this kind of dunnage by a robot, for example, a dunnage having a chuck metal fitting fixed in the hollow bulge described above, or a tool locking hole instead of the chuck metal fitting is passed through. Dungege formed and prepared is also known.
JP 2002-370767 (paragraphs [0007], [0015], FIG. 3)

  By the way, since the concave and convex portions on the upper surface and the concave and convex portions on the lower surface of the dunnage are integrated, the hollow bulge portion of the upper dunnage is the inner back of the hollow bulge portion of the lower dunnage. Rush to the center. As a result, the hollow bulge of the upper dunnage interferes with the lower dunnage chuck metal fittings, or the tool locking holes of the upper and lower dunnage come close to each other, and the tool provided to the robot has multiple dunnage tools. There could be a situation in which the dunnage cannot be conveyed one by one through the locking hole. Therefore, conventionally, a plurality of abutting parts are separately attached to the lower surface of the dunnage, and these abutting parts are abutted between the upper and lower dunnages to prevent interference of the chuck metal fittings. However, a problem arises in that the manufacturing cost increases because a separate contact part is attached to the dunnage. Further, since the dunnage has a front and back integrated structure as described above, it has been difficult to integrally form a contact wall instead of the above-described contact parts with a general concave-convex structure. Further, when the contact wall is formed into an undercut shape and integrally formed with the dunnage, there may be a problem that the vacuum forming mold for dunnage has a complicated structure and becomes expensive.

  The “undercut shape” is a shape having a concave or convex portion that is recessed or protruded in a direction intersecting the direction in which the dunnage is separated from the dunnage vacuum forming mold. In addition, it means a shape in which it is difficult to separate the dunnage from the dunnage vacuum forming mold unless the portion for forming the uneven portion is made a movable structure.

  The present invention has been made in view of the above circumstances, and has a stacked contact wall for holding the stacked dunnages at a constant interval, and can be manufactured at a low cost and a dunnage vacuum mold for dunnage The purpose is to provide.

The dunnage according to the invention of claim 1 made to achieve the above object comprises a plurality of hollow bulges formed by partially bulging a thermoplastic resin sheet downward, and these hollow bulges. And a plurality of stacked abutment walls for holding the dunnages at regular intervals when stacked, and each of these stacked abutment walls is adjacent to a hollow space. a part of a pair of side walls opposed between the bulging portion, Ri Na welded to protrude allowed and mutual ridge portion chevron shape having a ridge line extending vertically, respectively, of the hollow expanded portion adjacent The pair of side walls opposed to each other are inclined so that the interval is widened toward the lower side, and a pair of access wall portions are provided that are close to each other by reducing the inclination of a part of both side walls. , Toko placing the product on contact wall to their center of each approaching wall To have the feature.

The vacuum forming mold for dunnage according to the invention of claim 2 has a plurality of hollow bulging portions in which a thermoplastic resin sheet is partially bulged downward, and loads from the upper surface side to these hollow bulging portions. A dunnage vacuum forming mold for vacuum forming a lower surface of a dunnage to be accommodated, and a plurality of contact wall forming portions for forming a plurality of stacked abutment walls for holding the stacked dunnages at a constant interval The plate-shaped forming wall for forming the opposing surface of the adjacent hollow bulges is provided with a slit extending in the vertical direction and having an open upper end, and facing the slit in the plate-shaped forming wall The abutting wall forming portion is formed by the formed portion, and the vacuum suction holes are arranged so that the portions facing each other through the slits of the thermoplastic resin sheet folded in half with the plate-shaped forming wall interposed therebetween are welded together. The abutment wall forming part is close to the slit With throat thickness becomes thinner, it has gradually thickness increases thickness inclined towards the bottom, characterized in place nearer to the plate thickness inclined slits were to approach zero.

[Invention of Claim 1]
When the dunnage of claim 1 is stacked, the lower end portion of the stacking contact wall provided in the upper dunnage is in contact with the portion of the lower dunnage located directly above the stacking contact wall, and the dunnages are fixed. Held at intervals. Thereby, the amount of the hollow bulge of the upper dunnage entering the hollow bulge of the lower dunnage can be regulated. Since the stacking contact wall is integrally formed with the dunnage, it is not necessary to separately attach a contact component to the dunnage as in the prior art, and the manufacturing cost can be reduced. In addition, the stacked contact wall is composed of a mountain-shaped portion having a ridge line extending vertically, and therefore does not have an undercut shape, and the vacuum forming mold for dunnage becomes inexpensive. Thus, the dunnage of the present invention has a stacked abutment wall for holding the stacked dunnages at a constant interval and can be manufactured at low cost.

Further , according to the configuration of the first aspect , since the approach wall portions provided on the pair of side walls are made closer to each other and the stacking contact walls are arranged at the center in the width direction of the approach wall portions. The protrusion amount of the chevron-shaped projecting portion constituting the upper abutting wall is suppressed, and local thinning of the thermoplastic resin sheet can be prevented.

[Invention of claim 2]
In order to mold the dunnage of claim 1, the vacuum mold for dunnage of claim 2 may be used. That is, when the vacuum forming mold for dunnage of claim 2 is heated and a thermoplastic resin sheet is laid thereon, the thermoplastic resin sheet is folded in half with the plate-shaped molding wall interposed therebetween. And by suction of the vacuum suction hole, the thermoplastic resin sheet is deformed into a mountain shape so that the portions facing each other through each slit approach each other, and the ridge line portions are welded to each other to form the stacked contact wall Is done.

Further, in the vacuum forming mold for dunnage according to claim 2 , the contact wall forming portion has a plate thickness inclination that becomes thinner as it gets closer to the slit and gradually increases toward the lower side. Since the plate thickness inclination approaches 0 as it gets closer to the slit, the thickness of the proximal end side of the abutting wall molding portion is reduced while reducing the thickness of the abutting wall molding portion with the slit interposed therebetween. The thickness can be increased gradually to ensure strength. Thereby, when the dunnage is separated from the dunnage vacuum forming mold, it is possible to prevent deformation of the contact wall forming portion.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the dunnage 10 of the present embodiment has a horizontally long rectangular planar shape and includes a plurality of hollow bulging portions 11. Further, the dunnage 10 is a vacuum molded product of a thermoplastic resin sheet, and each hollow bulging portion 11 is formed by bulging a part of the thermoplastic resin sheet downward as shown in FIG. Furthermore, the planar shape of each hollow bulging portion 11 is a substantially rectangular plane extending in the lateral direction X (see FIG. 1) of the dunnage 10 as shown in FIG. The hollow bulges 11 are arranged in two rows in the lateral direction X of the dunnage 10 and four in each row.

  As shown in FIG. 2, each hollow bulging portion 11 includes a side wall 12 slightly inclined inward and a bottom wall 13 that is horizontal, and a bottom corner between the side wall 12 and the bottom wall 13. 13A is chamfered in a tapered shape. Further, as shown in FIG. 5, a plurality of positioning irregularities 14 are formed in each hollow bulging portion 11 by projecting or sinking part of the side wall 12 and the bottom wall 13. Then, when the luggage G is accommodated from above in each hollow bulging portion 11, a predetermined portion of each luggage G is positioned in contact with the positioning uneven portion 14, and a part of the luggage G protrudes from the upper surface of the dunnage 10. It becomes a state. Further, when another dunnage 10 is stacked on the dunnage 10 containing the luggage G, the luggage G accommodated in the lower dunnage 10 comes into contact with the lower surface of the positioning unevenness portion 14 in the upper dunnage 10, and the upper and lower dunnage 10 , 10 are positioned in the vertical, horizontal, and height directions.

  By the way, the luggage G accommodated in the dunnage 10 is, for example, a crankshaft, and is carried into and out of the hollow bulging portion 11 by a robot (not shown). For this purpose, a gripping device (not shown) is provided at the tip of the robot. A pair of gripped portions G1 and G1 arranged on the rotation shaft of the crankshaft as the luggage G can be gripped and lifted by a gripping device.

  The dunnage 10 in which the luggage G is empty is lifted and conveyed by the robot described above. For this purpose, as shown in FIG. 1, a pair of chuck fittings 15, 15 are attached to the center of the dunnage 10. Specifically, the four hollow bulging portions 11 in the center of the dunnage 10 are connected to each other in the lateral direction X (see FIG. 1) by two hollow bulging portions 11 via a gripping device insertion groove 11A. As shown in FIG. 2, each gripping device insertion groove 11 </ b> A is narrower than the entire hollow bulging portion 11, and is slightly shallower. A chuck fitting 15 is fixed to one end portion of each of the four hollow bulging portions 11 arranged on the left side in FIG. 1, and a part of the chuck fitting 15 is gripped. It has entered into the device insertion groove 11A. Further, as shown in FIG. 3, each chuck metal fitting 15 has a semicircular cross section when viewed from the width direction of the gripping device insertion groove 11 </ b> A, and its curved surface is brought into contact with the bottom surface of the hollow bulging portion 11. In this state, it is fixed to the bottom wall 13 with, for example, a screw penetrating the bottom wall 13. The interval between the chuck metal parts 15 and 15 is the same as the interval between the pair of gripped portions G1 and G1 in the luggage G. Thereby, both the chuck | zipper brackets 15 and 15 can be hold | gripped using the above-mentioned holding | grip apparatus of a robot. That is, the gripping device grips the chuck metal fittings 15 and 15 from the lateral direction X (see FIG. 1) of the dunnage 10, and at this time, a part of the gripping device is inserted into the gripping device insertion grooves 11A and 11A. The Then, the dunnage 10 can be lifted and conveyed by the robot.

  As shown in FIG. 1, the hollow bulging portions 11 and 11 adjacent to each other in the lateral direction X of the dunnage 10 are all at the same interval. On the other hand, the hollow bulging portions 11, 11 adjacent to each other in the longitudinal direction Y of the dunnage 10 have two hollow bulging portions 11, 11 near the center in the longitudinal direction Y. It is relatively wider than the spacing between the protruding portions 11 and 11. A pair of reinforcing grooves 11B and 11B are provided in parallel so as to communicate between the two hollow bulging portions 11 and 11 closer to the center in the vertical direction Y. Each reinforcing groove 11B has a rectangular groove shape as shown in FIG. 3, and the bending deformation of the dunnage 10 is restricted by the side walls of the reinforcing grooves 11B. On the other hand, a pair of contact receiving portions 25 are provided between the two hollow bulging portions 11 near the both ends in the longitudinal direction Y, as shown in FIG. Each abutment receiving portion 25 has a structure in which a part of the band plate portion 11C sandwiched between the hollow bulging portions 11 and 11 of the dunnage 10 is narrowed and recessed into a round groove shape as shown in FIG. It has become.

  Now, as shown in FIG. 2, on the lower surface of the dunnage 10, the side walls 12, 12 of the adjacent hollow bulging portions 11, 11 face each other with a gap therebetween. Further, a stacked contact wall 20 according to the present invention is formed below each contact receiving portion 25 between the adjacent hollow bulging portions 11 and 11. Specifically, as shown in FIG. 7, the pair of side walls 12, 12 is provided with a pair of approaching wall portions 22, 22 with their opposing portions partitioned into quadrilaterals (FIG. 7, Only one approach wall 22 is shown). The approach wall portions 22 and 22 are closer to each other with a smaller inclination than the side walls 12 and 12 as a whole. Further, the approaching wall portions 22 and 22 extend in the vertical direction from the upper end portion of the side wall 12 to the boundary portion with the bottom corner portion 13A as shown in FIG. And as shown in FIG. 7, the contact receiving part 25 is located in the center of the width direction among each approach wall part 22. As shown in FIG. Below the abutment receiving portion 25, mountain-shaped projecting portions 21, 21 are formed by projecting part of the side walls 12, 12 of the approaching wall portions 22, 22 into a mountain shape having ridge lines extending vertically. Yes. The stacked abutting walls 20 are formed by closely contacting the ridge portions of the mountain-shaped projecting portions 21 and 21. As described above, in the dunnage 10 of the present embodiment, the slopes of the approach wall portions 22 and 22 provided on the pair of side walls 12 and 12 are reduced to approach each other, and the mountain-shaped protrusions 21 and 21 extend from the approach wall portions 22 and 22. Therefore, the amount of protrusion required to bring the angled protrusions 21 and 21 into close contact with each other can be suppressed, and local thinning of the thermoplastic resin sheet on the stacked contact wall 20 can be prevented.

  FIG. 8 shows a part of a dunnage vacuum forming mold 50 for forming the dunnage 10 described above. The vacuum mold for dunnage 50 is for molding the lower surface of the dunnage 10 and has a plurality of molding recesses 51 corresponding to the hollow bulging portion 11. Adjacent molding recesses 51, 51 are partitioned by a plate-shaped molding wall 52. The plate-shaped forming wall 52 is provided with a plate thickness inclination so that the plate thickness gradually increases toward the lower side. Further, a plurality of vacuum suction holes 56 are scattered in the entire vacuum forming mold 50 for Dungege.

  Now, the plate-shaped forming wall 52 is provided with a contact wall forming portion 53 for forming the stacked contact wall 20. Specifically, an approach wall forming portion 54 is formed at a predetermined location of the plate-shaped forming wall 52 by partially reducing the thickness gradient of a part of the plate-shaped forming wall 52. The step between the approaching wall forming part 54 and the periphery thereof gradually increases toward the lower side of the plate-like forming wall 52, and at the lower end of the approaching wall forming part 54, The step surface between the periphery and the periphery is a flat step surface 54A facing upward. A part of the plurality of vacuum suction holes 56 described above is disposed on the step flat surface 54A. A slit 55 having an open upper end is formed at the center of the approaching wall forming portion 54 in the longitudinal direction of the plate-shaped forming wall 52. A portion of the plate-shaped molding wall 52 that is opposed to the slit 55 is a contact wall molding portion 53.

  The space | interval of the front-end | tip part which opposes across the slit 55 among the contact wall shaping | molding parts 53 is gradually expanded as it goes to a upper end part from a lower end part. Further, as shown in FIG. 9, the contact wall forming portion 53 has a tapered shape with a width that gradually decreases toward the slit 55 as viewed from above. Further, as the contact wall forming portion 53 is closer to the slit 55, the plate thickness inclination becomes closer to 0, and the plate thickness inclination is 0 at the most distal portion of the contact wall forming portion 53. That is, the plate thickness of the most distal end portion of the contact wall forming portion 53 is uniform from the upper end portion to the lower end portion. By configuring the contact wall forming portion 53 in this way, the proximal end side of the contact wall forming portion 53 is made thin while reducing the thickness of the tip of the contact wall forming portion 53 that is abutted across the slit 55. The thickness can be gradually increased to ensure strength. Thereby, when the dunnage 10 is detached from the dunnage vacuum forming mold 50, the deformation of the contact wall forming portion 53 can be prevented.

  The formation of the dunnage 10 using the dunnage vacuum forming mold 50 is as follows. The dunnage vacuum forming mold 50 is heated, and a thermoplastic resin sheet (not shown) is laid on the upper surface of the dunnage vacuum forming mold 50. Then, the Dungege's vacuum forming mold 50 is heated and can be easily deformed. Then, air between the vacuum forming mold for Dungege 50 and the thermoplastic resin sheet is sucked from the vacuum suction hole 56. Then, a part of the thermoplastic resin sheet is pulled into each molding recess 51, and the hollow bulging portion 11 is molded. At this time, the thermoplastic resin sheet is folded in half with the plate-shaped molding wall 52 between the adjacent molding recesses 51, 51 interposed therebetween. Then, by suction from the vacuum suction hole 56, the thermoplastic resin sheet is deformed into a mountain shape so that the portions facing each other through the slit 55 approach each other to form mountain-shaped protrusions 21, 21, and these mountain-shaped protrusions 21. , 21 are closely contacted to form the stacked contact wall 20. In addition, a portion of the thermoplastic resin sheet positioned above the slit 55 is pulled downward to be deformed into a groove shape, and becomes a contact receiving portion 25. In this way, the lower surface of the dunnage 10 is formed by the dunnage vacuum forming mold 50. The dunnage 10 is completed by cooling the dunnage vacuum forming mold 50 and attaching the chuck metal fitting 15 to the one removed from the dunnage vacuum forming mold 50.

  This completes the description of the configuration of the present embodiment. Next, the function and effect of this embodiment will be described. To accommodate the luggage G in the dunnage 10, the empty dunnage 10 is placed on the pallet. For this purpose, for example, the chuck fittings 15 and 15 of the dunnage 10 may be held by a holding device of a robot, and the dunnage 10 may be lifted and placed on the pallet. Then, using the same robot gripping device, the cargo G is gripped and lifted, and stored one by one in the hollow bulging portion 11 of the dunnage 10 on the pallet. When the luggage G is accommodated in all the hollow bulging portions 11 of the dunnage 10, another empty dunnage 10 is placed thereon. Then, the load G accommodated in the lower dunnage 10 comes into contact with the lower surface of the positioning concave-convex portion 14 in the upper dunnage 10, so that the upper and lower dunnages 10, 10 are positioned in the vertical, horizontal, and height directions. The In this state, the luggage G is sequentially accommodated in the upper dunnage 10. By repeating the above operation, as shown in FIG. 5, a plurality of dunnages 10 containing luggage G are stacked on the pallet. The plurality of dunnages 10 are mounted on the vehicle for each pallet and conveyed.

  Further, at the transport destination, an operation opposite to the above operation may be performed to take out the luggage G from the dunnage 10. At this time, when the empty dunnage 10 is stacked, the hollow bulging portion 11 of the upper dunnage 10 enters the hollow bulging portion 11 of the lower dunnage 10. However, as shown in FIG. 6, the stacked contact wall 20 of the upper dunnage 10 contacts the lower contact receiving portion 25, so that the hollow bulging portion 11 of the upper dunnage 10 is in contact with the lower dunnage 10. The amount of protrusion into the hollow bulge portion 11 is restricted, and the hollow bulge portion 11 of the upper dunnage 10 is prevented from coming into contact with the chuck metal fitting 15 of the lower dunnage 10. As a result, the upper and lower dunnages 10 and 10 are held at a constant interval in a stable state.

  As described above, the dunnage 10 of the present embodiment is integrally formed with the stacked contact wall 20 for holding the upper and lower dunnages 10 and 10 at a constant interval. There is no need to attach a separate abutment part to the manufacturing cost, and manufacturing costs can be reduced. Moreover, since the stacking contact wall 20 is composed of the mountain-shaped protrusions 21 and 21 having ridges extending vertically, it does not have an undercut shape, and the dunnage vacuum forming mold 50 is inexpensive. That is, the dunnage 10 of the present embodiment has a stacked abutment wall 20 for holding the stacked dunnages 10 and 10 at a constant interval and can be manufactured at low cost. Further, by providing the stacked contact wall 20, the strength of the dunnage 10 can be increased, and the warpage of the dunnage 10 at the time of cooling in vacuum forming can be prevented.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.
(1) Although the separate parts of the chuck metal fitting 15 are attached to the dunnages 10 and 70 of the above embodiment, a tool provided in the robot is formed by penetrating a tool locking hole instead of the chuck metal fitting 15. The tool locking hole may be locked and the dunnage may be lifted one by one.

  (2) In the above embodiment, the present invention is applied to the dunnages 10 and 70 conveyed by the robot. However, the present invention may be applied to a dunnage conveyed manually.

The top view of the dunnage which concerns on 1st Embodiment of this invention. Side cross-sectional view of dunnage in the BB cut plane of FIG. 1 is a side sectional view of the dunnage along the AA section of FIG. 1 is a side cross-sectional view of the dunnage at the section C-C in FIG. Side cross-sectional view of the stack of dunnage containing luggage Side cross-sectional view of stacking empty dunnage Of dunnage and dunnage vacuum forming mold Perspective view of contact receiving part Plan view of contact wall forming part in vacuum forming mold for dunnage

Explanation of symbols

10 Dungege
11 Hollow bulging part 12 Side wall 15 Fitting for chuck
20 Stacking contact wall 22 Approaching wall portion 50, 80 Vacuum forming mold for dunnage 52 Plate-shaped molding wall 53 Contact wall forming portion 55 Slit 56 Vacuum suction hole G Luggage P Thermoplastic resin sheet

Claims (2)

It is a dunnage in which a thermoplastic resin sheet is partially bulged downward to form a plurality of hollow bulges, and a load is accommodated in the hollow bulges from the upper surface side,
A plurality of stacked abutment walls are provided for holding the dunnages at a predetermined interval when stacked, and each of these stacked abutment walls is formed by a pair of side walls facing each other between the adjacent hollow bulges. some, Ri Na welded to protrude allowed and mutual ridge portion chevron shape having a ridge line extending vertically, respectively,
A pair of side walls opposed to each other between the adjacent hollow bulges are inclined so that the distance increases toward the lower side. A dunnage comprising a pair of approach wall portions, and the stacked abutment wall disposed in the center of each of the approach wall portions . A vacuum forming metal for dunnage having a plurality of hollow bulging portions in which a thermoplastic resin sheet is partially bulged downward, and vacuum forming the lower surface of the dunnage in which loads are accommodated in the hollow bulging portions from the upper surface side. Type,
A plurality of contact wall forming portions for forming a plurality of stacked contact walls for holding the stacked dunnages at a constant interval;
The plate-shaped molding wall for molding the facing surface of the adjacent hollow bulges is provided with a slit extending in the vertical direction and having the upper end opened, and the portion of the plate-shaped molding wall facing the slit The abutting wall molding part is configured with
A vacuum suction hole is arranged so that portions facing each other through the slits of the thermoplastic resin sheet folded in half with the plate-shaped molding wall are welded to each other,
The abutting wall forming portion has a plate thickness inclination that becomes thinner as it gets closer to the slit and gradually increases as it goes downward, and the thickness inclination becomes 0 as it gets closer to the slit. A vacuum forming mold for dunnage, characterized by approaching

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