JP2009190855A - Stacker crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight stacker crane with a mast thereof having a truss structure. <P>SOLUTION: The mast of the stacker crane has the truss structure comprising a chord member and a lattice member. At least one of the chord member and the lattice member is constituted of a carbon fiber-reinforced plastic. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to weight reduction of a stacker crane mast.

The stacker crane is required to improve running performance such as acceleration / deceleration and stopping accuracy. The inventor studied to meet this demand with a lighter mast, and arrived at the present invention. Prior art related here is disclosed in Japanese Patent Application Laid-Open No. 2002-104614, which discloses a mast of a truss structure.
JP-A-2002-104614

An object of the present invention is to improve the running performance of a stacker crane by reducing the weight of a mast.
An additional problem in the present invention is to form a guide surface of a lifting platform using a chord material.
An additional object of the present invention is to make it possible to easily obtain a continuous guide surface at the connecting portion of the chord material.

This invention is a stacker crane equipped with a mast of a truss structure having an upright string material and a lattice material,
At least one of the string material and the lattice material is a carbon fiber reinforced plastic material.

Preferably, the chord material is a carbon fiber reinforced plastic material having a T-shaped cross section, and guide surfaces for raising and lowering the lifting platform are formed on at least two surfaces of the T shape.
Particularly preferably, a thin-walled portion obtained by cutting the end portion of the chord material along the vertical direction is provided so that the thin-wall portions of the upper and lower pair of chord materials are abutted with each other at the end portions, and the thin-walled portion that is abutted is covered. The connecting plate of the carbon fiber reinforced plastic material is bonded to the thin wall portion, and the surface of the thin wall portion constitutes a continuous surface with the guide surfaces of the upper and lower chord members.

  In the present invention, the mast of the stacker crane is a truss structure, and at least one of the string material and the lattice material is a carbon fiber reinforced plastic (CFRP) material. For example, if both the string material and the lattice material are made of CFRP, the weight is reduced by about 70% as compared with a conventional mast made of an Al pipe, so that the total weight of the stacker crane can be reduced by about 30%. For this reason, the acceleration / deceleration can be increased by 20% or more with the same traveling motor, and the natural frequency can be increased by about 1.5 times. For these reasons, the dead time until the start of transfer can be shortened by improving the running performance of the stacker crane and reducing the shaking of the mast immediately after stopping. Furthermore, when a truss structure is used, a lighter mast can be obtained in which the amount of expensive CFRP used is less than that of a tubular structure.

  When the chord material is composed of CFRP having a T-shaped cross section, at least two surfaces of the T shape, in the embodiment, three surfaces can be used as the guide surface of the guide roller of the lifting platform. For this reason, a string material can be used also as a guide rail. It should be noted that a force is mainly applied to the lattice in the longitudinal direction, and the CFRP material has anisotropy because of high rigidity along the arrangement direction of the carbon fibers. Therefore, when the lattice material is also CFRP and anisotropy is given so as to increase the rigidity in the longitudinal direction, a light and inexpensive lattice material can be obtained.

  Since the mast of the stacker crane is tall, it is preferable to use a plurality of strings to join up and down. Here, in order to join the upper and lower guide surfaces provided on the string material so as to be continuous, a connection portion of carbon fiber reinforced plastic material is provided so as to cover the upper and lower thin parts by providing a thin wall portion at the end of the string material Adhere to thin parts. If the surface of the connection plate protrudes from the upper and lower guide surfaces, a continuous guide surface can be obtained by grinding the surface of the connection plate, for example. For this reason, by processing the surface of the connecting plate after joining, a continuous guide surface can be obtained above and below the joined portion.

  In the following, an optimum embodiment for carrying out the present invention will be shown.

  1 to 8 show an embodiment and its modifications. In the figure, 2 is a stacker crane, and a carriage 6 runs on a running rail 4, 7 is a running wheel, and 8 is a running motor. Reference numeral 10 denotes a mast, 12 denotes a drum, which is rotated by a lifting motor (not shown), 13 is a pulley, and a suspension member 14 that suspends the lifting platform 16 is wound or delivered by the drum 12 via the pulley 13. Reference numeral 17 denotes a transfer device such as a slide fork.

  The mast 10 has a truss structure composed of string members 18 and 19 and lattice members 20 and 21. In the embodiment, both the string members 18 and 19 and lattice members 20 and 21 are made of carbon fiber reinforced plastic (CFRP). However, you may comprise only one of a string material and a lattice material with a carbon fiber reinforced plastic material. Guide rollers 24 to 26 are provided on the vertical frame 22 of the elevator 16 and guided by a guide surface provided on the string member 18.

  2 and 3 show the structure of the mast 10, the string members 18 and 19 stand upright in the vertical direction, the lattice material 20 faces an oblique direction, and the lattice material 21 faces a horizontal direction. The mast 10 has a truss structure in which four string members 18 and 19 are coupled to each other by lattice materials 20 and 21, and guide surfaces 32 to 34 are provided on three surfaces of the two string members 18 on the lifting platform 16 side. Guide rollers 24 to 26 are guided. A rivet 36 or an adhesive is used for connection between the lattice materials 20 and 21 and the string materials 18 and 19. Further, since the string member 18 directly receives stress from the guide rollers 24 to 26 on the guide surfaces 32 to 34, the string member 18 may have a higher rigidity than the string member 19. Alternatively, the strings 18 and 19 may have the same rigidity for the convenience of manufacturing.

  In the embodiment, the four string members 18, 19 are used, but as shown in FIG. 4, three string members 18, 18, 40 may be used. The lattice material 20, 20 ′ has a mast cross section of, for example, a regular triangle shape, and the string material 40 is L-shaped instead of T-shaped in accordance with this, and the angle inside L is, for example, 60 °.

  FIG. 5 shows the carbon fiber reinforced plastic sheets 51 to 54, and the lines in the sheets 51 to 54 indicate the arrangement direction of the carbon fibers. The rigidity along the arrangement direction of the carbon fibers is high, and the rigidity in the direction perpendicular thereto. Is low. Therefore, the rigidity of the chord members 18 and 19 and the lattice members 20 and 21 in each direction can be controlled by changing the combination pattern of the sheets 51 to 54 or the thickness thereof. For example, in the case of the string members 18 and 19, in addition to the force in the vertical direction, centrifugal force due to acceleration / deceleration of the stacker crane 2 acts, and the string member 18 receives stress from the guide rollers 24 to 26. For this reason, the string members 18 and 19 are required to have rigidity balanced in both the vertical direction and the horizontal direction. On the other hand, in the lattice materials 20 and 21, since the stress along the longitudinal direction is mainly used, a highly anisotropic material is preferable. Therefore, in the lattice materials 20 and 21, the lattice materials 20 and 21 are provided with anisotropy by containing a large amount of carbon fibers oriented in the longitudinal direction.

  The lattice materials 20 and 21 have, for example, an L-shaped cross section. Lattice materials 20 and 21 having an L-shaped cross section can be easily joined to the chord materials 18 and 19 and have high bending rigidity. In order to obtain the L-shaped lattice materials 20 and 21, the sheets 51 to 53 may be bonded to the sheet 54 that can be easily bent into an L shape in FIG. 5. In order to create the T-shaped string members 18 and 19, for example, two L-shaped members are prepared and bonded with an adhesive back to back, or one piece of the L-shaped member is more A wide carbon fiber reinforced plastic sheet may be bonded to form a T shape. Reference numeral 30 denotes a T-shaped piece and the guide surfaces 32 and 33 are provided to face each other. Reference numeral 31 denotes a T-shaped other piece and the guide surface 34 is provided.

  6 and 8 show the joint locations of the upper and lower chord members 18, 18. Since the mast 10 of the stacker crane 2 is tall, it is preferable to join a plurality of string members 18 and 19 together in the vertical direction. And it is necessary for the guide surfaces 32-34 to continue in a joining location.

  6 and 8, reference numeral 61 is a butting line, which is a line where the ends of the upper and lower chords 18 and 18 are butted, and 62 and 63 are CFRP connecting plates. Reference numeral 64 denotes a CFRP mounting plate, which joins the upper and lower chords 18 and 18 with a rivet 36 or an adhesive. As shown in FIG. 8, the piece 30 is shaved at the end portion to form a thin portion 68, and a pair of connection plates 62 and 63, for example, are bonded to the surface of the thin portion with an adhesive (not shown). Since the surface height of the connecting plates 62 and 63 varies depending on the thickness of the adhesive, the portion protruding from the guide surfaces 32 and 33 is ground after joining. 69 and 70 are cutting allowances obtained by cutting the connection plates 62 and 63. By grinding, the surface heights of the guide surface 32 and the connection plate 62 are continuous, and the surface heights of the guide surface 33 and the connection plate 63 can be matched. In addition, as shown in FIG. 7 etc., the connection part 66 may be provided also to the piece 31, and a junction part may be reinforced.

In the embodiment, the following effects can be obtained.
(1) The mast 10 of the stacker crane 2 can be reduced in weight, thereby improving the running performance and shifting the natural frequency to the high frequency side so that the vibration of the mast 10 immediately after stopping can be quickly damped.
(2) Since the mast 10 has a truss structure, the amount of expensive CFRP used can be reduced and the mast can be made light.
(3) A T-shaped string 18 can be used as a guide for the lifting platform 16.
(4) The chord material can be easily joined by the connecting plates 62 and 63, and the guide surfaces 32 and 33 can be made continuous at the joint.
(5) Since stress along the longitudinal direction mainly acts on the lattice materials 20, 21, the lattice materials 20, 21 can be reduced in weight by providing anisotropy so as to increase the rigidity in the longitudinal direction.

In the embodiment, only the mast 10 is made of CFRP, but the carriage 6 may be made of CFRP as well. Further, in the embodiment, since the mast 10 is provided only on one side of the elevator base 16, the guide material 18 is provided with three guide surfaces and the total number of guide surfaces is six. However, the mast is provided on both sides of the elevator base. In some cases, the chord member 18 may be provided with two guide surfaces, and the total number of guide surfaces may be eight.

Side view of an example stacker crane Perspective view of stacker crane mast Horizontal section of stacker crane mast Horizontal cross-sectional view of a modified mast The figure which shows the sheet | seat used for a chord material and a lattice schematically Side view of the string material joint in the embodiment VII-VII sectional view of FIG. An enlarged view of the chord material around the connection plate

Explanation of symbols

2 Stacker crane 4 Traveling rail 6 Carriage 7 Traveling wheel 8 Traveling motor 10 Mast 12 Drum 13 Pulley 14 Suspension material 16 Lifting table 17 Transfer device 18, 19 String material 20, 21 Lattice material 22 Frame 24-26 Guide roller 30, 31 Pieces 32 to 34 Guide surface 36 Rivet 40 String material 51 to 54 Carbon fiber reinforced plastic sheet 61 Butting line 62, 63, 66 Connection plate 64 Mounting plate 68 Thin portion 69, 70 Cutting allowance

Claims (3)

A stacker crane with a truss structure mast having upright string material and lattice material,
A stacker crane in which at least one of the string material and the lattice material is a carbon fiber reinforced plastic material. 2. The stacker crane according to claim 1, wherein the string material is a carbon fiber reinforced plastic material having a T-shaped cross section, and at least two surfaces of the T shape are formed with guide surfaces for raising and lowering the lifting platform. Carbon fiber reinforced so as to provide a thin portion cut along the vertical direction of the end of the chord material, but to butt the thin portions of the upper and lower pair of chord materials together at the end portion and cover the butted thin portion 3. The stacker crane according to claim 2, wherein a connecting plate made of a plastic material is bonded to a thin portion, and a surface of the thin portion forms a continuous surface with a guide surface of upper and lower chord members.

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