JP2003237909A - Stacker crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stacker crane in which a lower frame thereof has a structure to be easily manufactured, a dead space attributable to the arrangement of traveling wheels and bearing units is reduced, and the supporting force from the bearing units can be surface-received. <P>SOLUTION: A bearing unit 30 of a traveling wheel 28 is fitted so as to support a bottom side of an upper plate 8 of a lower frame 2 of the stacker crane. The traveling wheel is arranged in a penetration space of the upper plate and travels along a traveling rail 26. The strength of the upper plate 8 is increased by a rib 14 extending in the longitudinal direction of the upper plate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacker crane, and more particularly to a structure of a lower frame for mounting traveling wheels.

[0002]

2. Description of the Related Art FIG. 5 shows a lower frame 50 of a conventional stacker crane.
4, 54 are provided, and traveling wheels 28, a bearing unit, a traveling motor 36, etc. are attached thereto. As shown in Figure 5,
The bottom plate 52 is arranged at a position as low as possible, and the space on the bottom plate 52 is made large to increase the effective space such as the rack of the automatic warehouse. Therefore, the bracket 54 is
Bend in two places. Since it is preferable to increase the distance between the front and rear guide rollers 34, the bracket 54
From the end of the guide roller mounting plate 56 to the traveling rail 26
Attach it by hanging it down.

In this case, since the bracket 54 having a large size and a high rigidity must be processed into an accurate shape, it becomes difficult to manufacture the lower frame. Further, due to the width L generated by bending the bracket 54 upward, there is a dead space where rack racks cannot be placed. The width of the dead space is approximately 2L. Further, as the bracket 54 is made, the guide roller mounting plate 56 must be additionally hung by the height H, and the positional accuracy of the guide roller 34 is reduced accordingly.

[0004]

SUMMARY OF THE INVENTION A basic object of the present invention is to provide a stacker crane which has a small dead space, is easy to manufacture, and can reliably receive a reaction force from a bearing unit with a lower frame ( Claim 1
3). An additional object of the invention of claim 2 is to simplify the structure of the lower frame and reduce its weight. Claim 3
Another object of the present invention is to further increase the strength of the lower frame.

[0005]

According to the stacker crane of the present invention, the lower frame is provided with a plate extending horizontally in the traveling direction, and the traveling wheel and the pair of bearing units on both the left and right sides thereof are provided so that the axis of the traveling wheel is the plate. The upper surface of the plate is arranged so that the bottom surface of the plate is in surface contact with the pair of bearing units, the bearing unit supports the plate, and the traveling wheels are supported through the through space provided in the plate. The traveling rail is brought into contact with the traveling rail (Claim 1).

Preferably, a pair of the plates is provided at both ends of the lower frame in the traveling direction, the mast is arranged on at least one of the plates, and the pair of plates are connected to each other so that the middle portion of the lower frame in the traveling direction is connected. Is provided with a pair of parallel side frames (claim 2).

Further, preferably, the bottom surface of the plate is arranged on the side frame, and a downward rib is provided on the bottom portion of the plate so as to be fixed to the side surface of the side frame (claim 3).

[0008]

According to the present invention, since the plate for mounting the traveling wheels extends horizontally in the traveling direction,
It is easy to produce and can be finished with high precision. Further, since the plate extends in the horizontal direction, there is no dead space generated when the plate is bent, and the storage capacity of articles can be increased when used in an automated warehouse or the like. Furthermore, in the bearing unit connected to the traveling wheels,
Since the bottom surface of the plate is brought into contact with and supported by surface contact, the reaction force applied from the traveling wheel side can be dispersed and received by the surface (claim 1).

According to the second aspect of the invention, since the load from the mast and the reaction force from the bearing unit are received by the plate,
The force applied between the pair of front and rear plates is small, and a pair of parallel side frames are provided between them to form the lower frame of the stacker crane. Therefore, the structure of the lower frame can be simplified and the lower frame can be lightened.

According to the third aspect of the present invention, the bottom surface of the plate is arranged on the side frame, a downward rib is provided on the bottom of the plate, and the rib is fixed to the side surface of the side frame by welding, bolt nuts or the like. Therefore, the connecting portion between the plate and the side frame can be easily reinforced.

[0011]

EXAMPLE An example is shown in FIGS. In these figures, 2 is the lower frame of the stacker crane, 4
Are a pair of parallel side frames, and here, for example, square pipes are used, and a connecting portion 6 is provided at the center of the lower frame 2 for connection. Hereinafter, the traveling direction of the lower frame 2 is referred to as the front-rear direction, both ends in the traveling direction are simply referred to as both ends, and the end portions in the traveling direction are simply referred to as end portions. The direction orthogonal to the traveling direction is the left-right direction, and the traveling direction of the lower frame is inward. It will be described as the inside. Lower frame 2
A pair of upper plates 8 and 8 are provided at both ends of and are fixed to the side frames 4 and 4. The upper plate 8 has a mast mounting plate 1
Two masts 12 and 12 are attached via 0, and when the mast is a single mast, it may be provided on either the front or rear upper plate. On the bottom surface of the upper plate 8, along the front-rear direction, the ribs 14 are formed over almost the entire length of the upper plate 8 from the end of the upper plate 8 to the lower portion of the mast mounting plate 10.
Is provided so as to hang downward, and at a portion overlapping the side frame 4,
It is fixed to the side frame 4 by bolts and nuts or welding. The rib 14 is provided at least at a portion where the side frame 4 and the upper plate 8 overlap.

A running wheel penetrating space 16 is provided along the center of the upper plate 8 in the left-right direction, and bearing unit mounting spaces 18, 18 are provided substantially symmetrically on both sides of the running wheel penetrating space 16 in the left-right direction. Reference numeral 20 is a traveling motor support plate, 22 is a guide roller mounting plate provided at both ends of the lower frame 2, and 24 is a concave portion provided near the innermost portion of the side frame 4 of the upper plate 8, and the upper plate. This is for reducing the rigidity of 8 at the end portion on the side frame 4. Instead of providing the concave portion 24, the rigidity of the upper plate may be reduced by thinning the upper plate 8 at this portion or cutting it obliquely in a horizontal plane.

Reference numeral 26 is a traveling rail, which is known per se, 28 is a traveling wheel, and 29 is a shaft thereof, and bearing units 30 are provided on both left and right sides of the traveling wheel 28.
It is arranged in the bearing unit mounting space 18 so that the traveling wheels 28 come into contact with the traveling rail 26 through the traveling wheel penetrating space 16. As shown in FIGS. 2 and 4,
The shaft 29 is located higher than the upper plate 8. Reference numeral 31 denotes a support surface on the bottom surface of the upper plate 8, and in this portion, the bottom surface of the upper plate 8 comes into surface contact with the bearing unit 30 to support the reaction force from the bearing unit 30. 32 and 33 are fasteners such as bolts and nuts. Reference numeral 34 is a guide roller, which is attached to both ends of the lower frame 2 in the front-rear direction via guide roller mounting plates 22 so as to sandwich the traveling rails 26, and 36 is a traveling motor which is attached to the traveling motor support plate 20. Drive the shaft 29 of. The traveling motor support plate 20 is attached to the upper plate 8.

The function of the embodiment will be described. Since the height of the side frame 4 and the upper plate 8 from the traveling rail 26 can be reduced, even if a shelf is provided from a low position of a rack (not shown),
Since the articles can be transferred using the stacker crane, the rack accommodation capacity can be increased. Since the upper plate 8 extends in the front-rear direction in the horizontal plane and has a simple shape, it is easy to process and can be precisely processed, and there is no dead space associated with the bending process, and the number of shelves that can be accommodated in a rack. Can be increased. As the upper plate 8 is extended in the horizontal plane while the height of the side frame 4 is kept low, the shaft 29 is arranged at a position higher than the upper plate 8 and the traveling wheels 28 pass through the traveling wheel penetration space 16. The bearing unit 30 is exposed to a position higher than most of the upper plate 8 while being in contact with the traveling rail 26 via the bearing unit 30. Here, the lower portion of the bearing unit 30 is extended to both sides in the front-rear direction, and in this portion, the supporting surfaces 31, 31 at the bottom of the upper plate 8 are brought into surface contact with each other, and the supporting surface 31 receives a reaction force from the traveling wheel 28 side. be able to. Since the height of the upper plate 8 can be made relatively low, the distance by which the guide roller mounting plate 22 is hung downward can be reduced, or it is not necessary to hang the guide roller mounting plate 22 downward. The traveling rail 26 can be accurately brought into contact with the traveling rail 26.

The balance of the forces applied to the upper plate 8 is shown in FIG. 4. The reaction force from the bearing unit 30 is applied as shown by the white arrow in FIG. 4, and the load from the mast 12 is applied as shown by the black arrow. Since most of the applied force is in the vertical plane, the ribs 14 hanging downward enhance the rigidity of the upper plate 8 in the vertical direction and reinforce the strength of the connection portion with the side frame 4. The portions of the upper plate 8 other than the ribs 14 may be simply placed on the side frame 4, or may be fixed by welding or the like. When viewed from the central portion of the lower frame 2, for example, from the connecting portion 6, the reaction force applied to the upper plate 8 and the load from the mast are almost balanced in each upper plate 8, so the force itself applied to the side frame 4 is relatively small. Therefore, the side frame 4 can be configured by a square pipe or the like, the weight of the lower frame 2 as a whole can be reduced, and the configuration can be simplified. However, stress concentration may occur at the end of the contact portion between the upper plate 8 and the side frame 4, and in order to prevent this, the recess 24 is provided to disperse the stress.

Although the upper plate 8 is arranged on the upper side of the side frame 4 in the embodiment, it may be arranged on the lower side. In addition to the ribs 14, ribs extending upward from the upper plate 8 are provided,
The rigidity in the vertical direction may be further increased. Further, the traveling wheel penetration space 16 may be penetrated to the guide roller mounting plate 22 side.

[Brief description of drawings]

FIG. 1 is a plan view showing a lower frame of a stacker crane of an embodiment, in which a mast is attached and traveling wheels and bearings thereof are removed.

FIG. 2 is a side view of the main part of the embodiment showing the vicinity of the lower frame of the stacker crane.

FIG. 3 is an enlarged plan view of essential parts showing an upper plate, traveling wheels, bearings, traveling motors, and a mast in the stacker crane of the embodiment.

FIG. 4 is a side view of the state of FIG.

FIG. 5 is a plan view showing a lower frame of a conventional stacker crane.

[Explanation of symbols]

2 Lower frame 4 side frames 6 connection 8 upper plate 10 Mast mounting plate 12 masts 14 ribs 16 Traveling wheel penetration space 18 Bearing unit mounting space 20 Travel motor support plate 22 Guide roller mounting plate 24 recess 26 Running rail 28 running wheels 29 axes 30 bearing unit 31 Support surface 32,33 Fastener 34 Guide roller 36 traveling motor 50 lower frame 52 Bottom plate 54 bracket 56 Guide roller mounting plate

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3F022 JJ09 MM17                 3F333 AA04 AB08 BF03 BF06 BG01                       CA06 DA02 DB03

Claims (3)

[Claims] 1. A lower frame of a stacker crane,
A plate extending horizontally in the traveling direction is provided, and a traveling wheel and a pair of bearing units on the left and right sides of the traveling wheel are provided so that the shaft of the traveling wheel is located above the plate and the bottom surface of the plate is provided with the pair of bearings. A stacker crane, which is arranged so as to be in surface contact with the unit, supports the plate by a bearing unit, and further allows the traveling wheels to contact the traveling rail via a through space provided in the plate. 2. A pair of the plates is provided at both ends in the traveling direction of the lower frame, the mast is arranged on at least one plate, and the pair of plates is connected to the middle portion in the traveling direction of the lower frame. The stacker crane according to claim 1, further comprising a pair of parallel side frames. 3. A bottom surface of the plate is arranged on the side frame, and a downward rib is provided on a bottom portion of the plate to be fixed to a side surface of the side frame.
Stacker crane.