JP2019001633A - Load drop prevention structure - Google Patents

Abstract

To provide a load drop prevention structure capable of easily setting even in a rack where a load or a pallet is stored.SOLUTION: A load drop prevention structure 1 of a rack warehouse comprises: support pillars 2 provided on four corners of a pallet storage part S; cross arms 3 extending from the support pillar 2 in a width direction of the pallet storage part S; and receiving sashes 4 bridged between the pair of cross arms 3, 3 positioned in a depth direction of the pallet storage part S. The load drop prevention structure further comprises: a base part 10 arranged along the cross arm 3; overhanging parts 20 overhanging from the base part 10 to a front side in the depth direction; and stopper members 30 for locking a pallet P mounted on the receiving sashes 4 in an earthquake. The stopper member 30 is attached to a side surface of the overhanging part 20 via a viscoelastic body 33.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a load drop prevention structure.

  As an automated warehouse that contributes to the efficiency of the logistics system, an automated warehouse that is configured by arranging multiple racks in parallel and installing a stacker crane on rails laid on the floor between the racks is known. It has been. The stacker crane includes a loading platform that moves up and down along a main pillar, and a fork that loads and unloads a pallet loaded with a load. The rack is provided with an opening on the front side of the crane so that the stacker crane can load and unload the load. The opening is provided with a load receiving table that protrudes from the support column, so that a pallet loaded with loads to be stored can be placed on the load receiving table.

  Such automatic warehouses often have a large tower ratio in order to secure a large amount of storage in a small area, and there is a risk of damage such as falling of stored items from the top of the rack during an earthquake. As a method of reducing the response of the rack during an earthquake and preventing the fall of the containment, a movable mass adjusted according to the natural frequency of the rack structure and a damper for attenuating the vibration of the movable mass are provided. There is a vibration control measure that installs a vibration control device in the upper part of the warehouse.

  Even if the vibration control device can exert an effect and suppress the shaking, some shaking occurs, so that slip may occur between the bottom surface of the pallet and the cargo receiving surface. When the pallet loaded with the load protrudes toward the stacker crane due to this slip, it is necessary to manually return the pallet to a predetermined storage position. Therefore, it takes a lot of labor and time for recovery. Therefore, as one of the measures for preventing slipping toward the stacker crane side, there has been a method of installing a stopper for locking the pallet on the load receiving material (see, for example, Patent Document 1). The stopper of Patent Document 1 is provided at the front end of the rack arm and a pallet is placed on the stopper.

JP 10-25008 A

  In the existing automatic warehouse, when the stopper of Patent Document 1 is installed, the construction is often performed while using the warehouse. In a shelf in which a load or a pallet is stored, it is necessary to install a stopper after moving the load or the pallet.

  From such a viewpoint, an object of the present invention is to provide a load fall prevention structure that can be easily installed even on a shelf in which a pallet loaded with a load is stored.

  The present invention for solving such a problem includes a support provided at the four corners of the pallet receiving part, an arm extending from the support in the width direction of the pallet receiving part, and a depth direction of the pallet receiving part. It is a load drop prevention structure of a rack warehouse provided with a receiving bar spanned between a pair of positioned arms. And a base portion disposed along the arm, an overhang portion projecting from the base portion toward the near side in the depth direction, and a stopper member for locking the pallet placed on the receiving bar in the event of an earthquake. The stopper member is attached to a side surface of the overhanging portion via a viscoelastic body.

  According to the load drop prevention structure having the above-described configuration, the base portion, the overhang portion, and the stopper member are not disposed between the receiving member and the pallet, and therefore it is not necessary to move the pallet when installing the stopper member. Further, if the overhanging portion and the stopper member are previously attached to the base portion and integrated, the stopper member can be installed only by fixing the base portion to the arm. Therefore, even if the pallet on which the pallet on which the load is loaded is stored, the stopper can be easily installed. Further, since the stopper member is attached to the overhanging portion via the viscoelastic body, even if the pallet collides with the stopper member, the viscoelastic body can be deformed and the impact can be reduced. Thereby, the load shift of the load on the pallet can be suppressed.

  In the load drop prevention structure according to the present invention, it is preferable that the base portion has a gate-shaped cross section and is disposed so as to cover the upper surface and the side surface of the brace. According to such a structure, it can attach easily only by covering a base part on a brace.

  Further, in the load drop prevention structure according to the present invention, the base portion extends on both sides in the width direction across the column, and the overhang portion and the stopper member are respectively provided at both end portions of the base portion. What is provided is preferable. According to such a structure, the stopper member of the pallet accommodating part of the both sides of a support | pillar can be installed simultaneously.

  In the load drop prevention structure according to the present invention, the stopper member includes a mounting plate portion and a locking plate portion, and the overhanging portion covers the mounting plate portion and the viscoelastic body. A member is attached, and the attachment plate part and the viscoelastic body are preferably sandwiched between a cover member and the overhanging part. According to such a configuration, since the mounting plate portion and the viscoelastic body are pressed by the cover member, only the shear deformation force acts on the viscoelastic body, and the bending / tensile force does not act. Therefore, it can prevent that a viscoelastic body peels from an overhang | projection part.

  According to the load drop prevention structure of the present invention, even a shelf in which a pallet loaded with a load is stored can be easily installed.

(A) is the top view which showed the state which installed the load fall prevention structure which concerns on embodiment of this invention, (b) is a side view. It is the perspective view which showed the load fall prevention structure which concerns on embodiment of this invention. It is the expansion disassembled perspective view which showed the load fall prevention structure which concerns on embodiment of this invention. It is the enlarged plan view which showed the modification of the cargo fall prevention structure which concerns on embodiment of this invention. It is the expansion perspective view which showed the modification of the cargo fall prevention structure which concerns on embodiment of this invention. It is the expansion perspective view which showed the further modification of the load fall prevention structure which concerns on embodiment of this invention.

  First, the structure of the rack warehouse in which the load drop prevention structure according to the embodiment of the present invention is installed and the load drop prevention structure will be described. The rack warehouse includes a plurality of pallet storage units arranged in multiple stages and multiple rows. As shown in FIG. 1, the pallet accommodating portions S are arranged at four corners (vertical angle positions of a rectangle in a plan view) when viewed from the stacker crane side (left side in FIG. 1) that conveys the pallet P. It is surrounded by the columns 2, 2,. The support 2 is provided with a brace 3 and a receiving bar 4. The arm 3 is provided on each of the front, rear, left and right columns 2 and projects from the column 2 in the left-right direction. A receiving bar 4 is bridged between the distal ends of a pair of arms 3 and 3 that project from the front and rear columns 2 and 2 respectively. Both the arm 3 and the receiving bar 4 are constituted by vertically long square pipes. The receiving bar 4 extends in the front-rear direction, and is provided at each of the left and right ends of the pallet housing part S. The front end portion of the receiving bar 4 projects forward from the front arm 3. The rear end portion of the receiving bar 4 protrudes rearward from the rear arm 3. The arm 3 and the receiving bar 4 form a cargo receiving platform 5. The pallet P is supported in a state of being spanned on the left and right receiving bars 4 and 4.

  The load drop prevention structure 1 is a structure that prevents a load or a pallet P from projecting and falling to the stacker crane side from the pallet accommodating portion S of the rack warehouse having the above-described configuration during an earthquake. As shown also in FIG. 2, the load drop prevention structure 1 is provided on the inlet opening side of the pallet housing portion S and includes a base portion 10, an overhang portion 20, and a stopper member 30.

  As shown in FIGS. 2 and 3, the base portion 10 is a portion arranged along the arm 3 and extends to both sides (left and right sides) in the width direction of the pallet housing portion S with the support column 2 interposed therebetween. Yes. Both end portions of the base portion 10 extend to a position where they do not interfere with the pallet P placed on the receiving bar 4. The base portion 10 includes an upper plate portion 11 and a pair of side plate portions 12 and 12 and has a cross-sectional gate shape. The base part 10 is arrange | positioned so that the upper surface 3a and side surface 3b, 3b of the arm 3 may be covered. That is, the upper plate portion 11 is placed on the upper surface 3a of the arm 3, and the side plate portions 12 and 12 sandwich the side surfaces 3b and 3b from both sides. The height dimension of the side plate portion 12 is larger than the height dimension of the side surface 3b of the arm 3, and the lower end portion of the side plate portion 12 projects downward from the lower end of the side surface 3b.

  A through hole 14 is formed in a downward projecting portion of the lower end portion of the side plate portion 12. The through holes 14 are coaxially formed on the side plate portions 12 and 12 facing each other. A bolt B is inserted into the pair of through holes 14, and a nut N is screwed to the tip of the bolt B. These through holes 14 are provided at both ends in the longitudinal direction of the base portion 10. Since the bolt B is fixed by passing below the arm 3, the base portion 10 is prevented from floating from the arm 3.

  A notch portion 15 is formed in the side plate portion 12 on the column 2 side of the intermediate portion of the base portion 10. The notch 15 is formed with a width equal to that of the support 2 and surrounds a portion where the arm 3 of the support 2 is joined.

  The overhang portion 20 projects from the base portion 10 to the near side (stacker crane side) of the pallet housing portion S in the depth direction. The overhang portions 20 are provided at both ends in the longitudinal direction of the base portion 10, but do not interfere with the pallet P. The overhang portion 20 is welded to the side plate portion 12 on the near side of the base portion 10. The overhanging portion 20 includes an upper plate portion 21 and a pair of side plate portions 22 and 22 and has a cross-sectional gate shape. In addition, the base part 10 is not limited to a cross-sectional gate type, and may have another shape such as a rectangular cross section. The upper plate portion 21 is flush with the upper plate portion 11 of the base portion 10. The outer surface of the outer side plate portion 22 is flush with the end surface of the base portion 10.

  The stopper member 30 is a part that locks the pallet P placed on the receiving bar 4 during an earthquake. The stopper member 30 includes a mounting plate portion 31 and a locking plate portion 32. The mounting plate portion 31 is made of a flat steel plate and is disposed along the side plate portion 22 of the overhang portion 20. The attachment plate portion 31 is fixed to the side plate portion 22 via the viscoelastic body 33. The viscoelastic body 33 is attached to the side plate portion 22 and the mounting plate portion 31 by thermocompression bonding or adhesion. The mounting plate portion 31 and the viscoelastic body 33 are located on the lower side of the pallet P. The upper end surface of the mounting plate portion 31 and the upper end surface of the viscoelastic body 33 are flush with the upper end surfaces of the arm 3 and the receiving bar 4.

  The viscoelastic body 33 has a flat plate shape and has a planar shape equivalent to that of the mounting plate portion 31. The viscoelastic body 33 is made of viscoelastic rubber having high damping performance, for example. The viscoelastic body 33 undergoes shear deformation when the pallet P moves in the front-rear direction and collides with the locking plate portion 32. The material and shape of the viscoelastic body 33 are appropriately determined so that sufficient rigidity (restoring force) and damping performance can be obtained with respect to the assumed vibration, cargo, weight of the pallet P, and the like.

  The locking plate portion 32 is welded to the front end portion of the mounting plate portion 31 in a state orthogonal to the mounting plate portion 31. The locking plate portion 32 is disposed at a position along the front end surface of the receiving bar 4. The locking plate portion 32 extends upward from the upper end surface of the mounting plate portion 31 and extends toward the center of the pallet housing portion S. The locking plate portion 32 overlaps with the extended line shape of the arrangement position of the pallet P.

  According to the load drop prevention structure configured as described above, the base portion 10, the overhang portion 20, and the stopper member 30 are not arranged between the receiving bar 4 and the pallet P. Therefore, when the stopper member 30 is installed, the pallet P There is no need to move. Moreover, since the base part 10, the overhang | projection part 20, and the stopper member 30 are attached previously, the stopper member 30 can be installed only by fixing the base part 10 to the brace 3. Therefore, the stopper can be easily installed.

  Moreover, since the base part 10 is exhibiting the cross-sectional gate type | mold, it can be easily installed only by covering the brace 3. Moreover, since the lower part of the side plate parts 12 and 12 is connected with the volt | bolt B and the nut N, the arm 3 can be surrounded over the circumferential direction full length, Therefore It can prevent that the base part 10 remove | deviates from the arm 3.

  Furthermore, the base portion 10 extends on both sides in the width direction with the support column 2 interposed therebetween, and the overhang portion 20 and the stopper member 30 are provided at both ends of the base portion 10, respectively, so that one load drop By simply installing the prevention structure 1, the stopper members 30, 30 of the pallet housing portions S, S on both sides of the column 2 can be installed at the same time.

  Moreover, since the load drop prevention structure 1 provided with the stopper member 30 is provided on the inlet opening side of the pallet housing portion S, even if the pallet P slips to the stacker crane side in the event of an earthquake, it is locked by the stopper member 30. can do. Thereby, it is possible to prevent the load or the pallet P from protruding toward the stacker crane.

  Furthermore, since the stopper member 30 is attached to the overhanging portion 20 via the viscoelastic body 33, even if the pallet P collides with the stopper member at the time of an earthquake, the viscoelastic body 33 is shear-deformed and softens the impact. Therefore, it is possible to suppress the occurrence of impact acceleration and return the pallet P to the original position by the elastic behavior of the viscoelastic body. Accordingly, it is possible to suppress the fall of individual loads accompanying the protrusion due to the displacement of the load / pallet P or the collapse of the load due to the impact acceleration.

  Next, the load drop prevention structure 1a according to the modification will be described. As shown in FIGS. 4 and 5, in the load drop prevention structure 1 a, the mounting plate portion 31 and the viscoelastic body 33 of the stopper member 30 are covered with a cover member 35.

  The cover member 35 includes a side plate portion 36 and an upper plate portion 37, and has an L-shaped cross-sectional shape upside down. The upper plate portion 37 of the cover member 35 is flush with the upper plate portion 21 of the overhang portion 20 and the upper plate portion 11 of the base portion 10. The cover member 35 is welded to the base portion 10 and the overhang portion 20. The protruding dimension (inner dimension) of the upper plate part 37 from the side plate part 36 is equivalent to the thickness dimension of the mounting plate part 31 and the viscoelastic body 33 combined. That is, the attachment plate portion 31 and the viscoelastic body 33 are sandwiched between the side plate portion 22 of the overhang portion 20 and the side plate portion 36 of the cover member 35. In this modification, the protruding dimension of the locking plate portion 32 toward the pallet is larger than that of the above-described embodiment (see FIGS. 2 and 3).

  In this modification, the overhanging portion 20 has a thickness obtained by combining the attachment plate portion 31, the viscoelastic body 33, and the side plate portion 36 of the cover member 35 from the longitudinal end portion of the base portion 10 toward the middle portion in the longitudinal direction. The size is offset and fixed. The outer surface of the side plate portion 36 is flush with the end surface of the base portion 10. Other configurations are the same as those in the embodiment of FIGS. 1 to 3, and thus the same reference numerals are given and description thereof is omitted.

  According to the load drop prevention structure 1a having the above-described configuration, even if a tensile shear is applied to the viscoelastic body 33 due to a single contact of the pallet P, the viscoelastic body 33 is pressed by the cover member 35. It can prevent peeling from the side plate part 22.

  The shape of the cover member 35 is not limited to the L shape, and may be a gate-shaped cross section. When the cover member has a gate-shaped cross section, the cover member may be fixed to the side surface of the overhang portion, or the cover member and the overhang portion may be used together. Below, the form at the time of combining a cover member and an overhang | projection part is demonstrated as a further modification.

  As shown in FIG. 6, in the load drop prevention structure 1 b according to the further modification, the mounting plate portion 31 and the viscoelastic body 33 of the stopper member 30 are provided inside the overhang portion 20, and the overhang portion 20 is provided. Covered with That is, the overhanging portion 20 also serves as a cover member.

  In this modification, the overhang portion 20 has the same shape as the overhang portion 20 in FIGS. 1 to 3 and is provided at the same position. The viscoelastic body 33 is affixed to the inner surface of the side plate portion 22 on the pallet housing portion side by thermocompression bonding or adhesion. A mounting plate portion 31 is attached to the surface of the viscoelastic body 33 opposite to the pallet housing portion side by thermocompression bonding or adhesion. The projecting dimension of the locking plate portion 32 toward the pallet is larger than that in the embodiment (see FIGS. 2 and 3). Other configurations are the same as those in the embodiment of FIGS. 1 to 3, and thus the same reference numerals are given and description thereof is omitted.

  According to the load drop prevention structure 1b having the above-described configuration, it is possible to obtain the same functions and effects as those of the embodiment shown in FIGS. Moreover, if the inner dimension between the side plate parts 22 and 22 of the overhanging part 20 is made equal to the thickness dimension of the mounting plate part 31 and the viscoelastic body 33, the viscoelastic body can be affected by the contact of the pallet P. Even if tensile shear is about to act on 33, it can be prevented from peeling off the viscoelastic body 33 from the side plate portion 22 because it is pressed by the side plate portions 22, 22.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably. For example, in the above-described embodiment, the base portion 10 extends on both sides in the width direction with the support column 2 interposed therebetween, and the overhang portion 20 and the stopper member 30 are provided at both ends of the base portion 10, respectively. It is not limited. It is good also as a structure which provided the base part of a separate body in each of the both sides of a support | pillar, and provided the overhang | projection part and the stopper member in each base part, respectively. According to such a structure, since the load drop prevention structure is separated and reduced in weight, transportation and installation are further facilitated.

  Moreover, in the said embodiment, although the lower end part of the side-plate parts 12 and 12 of the base part 10 is connected with the volt | bolt B, the base part 10 is being fixed to the arm 3, The fixing structure of the base part 10 is to this. It is not limited. The base portion 10 may be bolted directly to the arm 3 or may be welded.

DESCRIPTION OF SYMBOLS 1 Cargo fall prevention structure 1a Cargo fall prevention structure 1b Cargo fall prevention structure 2 Support | pillar 3 Arm 4 Receiving rail 10 Base part 20 Overhanging part 30 Stopper member 31 Mounting plate part 32 Locking plate part 33 Viscoelastic body 35 Cover member P Pallet S Pallet housing

Claims (4)

Columns provided at the four corners of the pallet housing unit, arms that extend from the column in the width direction of the pallet housing unit, and receiving bridges that span the pair of arms positioned in the depth direction of the pallet housing unit In the load drop prevention structure of the rack warehouse equipped,
A base portion disposed along the arm; an overhang portion projecting from the base portion toward the near side in the depth direction; and a stopper member that locks the pallet placed on the receiving bar in the event of an earthquake. And
The stopper member is attached to a side surface of the overhang portion via a viscoelastic body. The load drop prevention structure according to claim 1, wherein the base portion has a gate-shaped cross section and is disposed so as to cover an upper surface and a side surface of the brace. The base portion extends on both sides in the width direction across the support column,
The load drop prevention structure according to claim 1 or 2, wherein the overhang portion and the stopper member are provided at both ends of the base portion, respectively. The stopper member includes a mounting plate portion and a locking plate portion,
A cover member that covers the attachment plate portion and the viscoelastic body is attached to the overhang portion,
The load drop prevention structure according to any one of claims 1 to 3, wherein the mounting plate portion and the viscoelastic body are sandwiched between the cover member and the overhang portion.

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