JP2002293407A - Stacker crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light mast standing offset load when a slide fork is advanced. SOLUTION: Guide rollers 34 and 34 of an elevating/lowering table are allowed to abut on a side surface of the mast of this stacker crane to support offset load in an advancing direction of the slide fork 52. The guide rollers 34 and 34 are mounted on a bracket 58 to make the bracket 58 oscillatable within a vertical surface with an eccentric shaft 62 as a center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stacker crane used for an automatic warehouse or the like.

[0002]

2. Description of the Related Art In a stacker crane, an elevator is moved up and down along a mast. Then, in order to support an uneven load when the slide fork or the like advances, a guide roller provided on the lift table is guided by a side surface of a lift rail provided on the mast.
The inventor has found that, when the guide roller is guided by the side surface of the mast itself, a large force is applied to the mast when the slide fork advances, and the mast is unreasonably applied.

[0003]

SUMMARY OF THE INVENTION A basic object of the present invention is to prevent a force from being applied to a mast by a force applied from a guide roller to a side surface of the mast. Claim 2
An additional object of the invention is to make it possible to easily adjust the position of the guide roller. Another object of the present invention is to reduce the weight of the mast.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a stacker crane in which a lift is moved up and down along a mast and a guide roller provided on the lift is guided by a side surface of the mast. A movable bracket is provided, and guide rollers are provided at least on each of the upper and lower sides of the bracket, and each of the guide rollers is guided by a side surface of a mast that is substantially perpendicular to the traveling direction of the stacker crane. It is characterized by the following (claim 1).

[0005] Preferably, an eccentric shaft is provided at the swing center of the bracket, and the distance between the bracket and the mast can be adjusted by rotating the eccentric shaft.

Preferably, the mast is constituted by a hollow column in which a plurality of column members are connected to each other, and a lift table is guided by at least two of the column members, and the two columns are connected to each other. The guide roller is guided on a side surface of the column member in a direction substantially perpendicular to the traveling direction of the stacker crane, and the other guide roller provided on the lifting platform is guided on a side surface facing the traveling direction (claim 3).

[0007]

According to the present invention, at least two guide rollers are provided on one bracket, and the bracket to which the guide rollers are attached is made swingable. These guide rollers are guided on the side of the mast that is oriented substantially perpendicular to the traveling direction of the stacker crane, and the uneven load applied to the lifting platform when transferring articles is transferred from the guide rollers to the side of the mast. To prevent the elevator from tilting. Now that the bracket is free to swing,
If only one of the guide rollers comes into contact with the side surface of the mast, the bracket swings due to the repulsive force from the mast, and the other guide roller also comes into contact with the mast. For these,
A plurality of guide rollers can be constantly brought into contact with the side surface of the mast, and the force at the time of transferring the articles is dispersed so that a thin mast can withstand. Since a plurality of guide rollers are used, a small guide roller can be used (claim 1).

According to the second aspect of the present invention, since the bracket is swung about the eccentric shaft, when the eccentric shaft is rotated, the mounting position of the bracket changes, and the position of the guide roller is adjusted so that the mast can be easily mounted. Can be fitted.

According to the third aspect of the present invention, the lifting table is guided by using a column member of a hollow mast, and the guide roller is guided on a side surface in a direction substantially perpendicular to the traveling direction of the stacker crane. The guide member guides another guide roller provided on the lifting platform, so that the column member can also be used as a guide for the lifting platform. For these reasons, the mast can be reduced in weight.

[0010]

1 to 6 show a stacker crane 2 according to an embodiment. The stacker crane 2 is a stacker crane for a high-rise automatic warehouse where the height of the mast 4 is, for example, about 50 m. In the stacker crane 2, since the high mast 4 runs at high speed, it is necessary to reduce the weight while maintaining the strength of the mast 4. As a matter of course, the present invention may be applied to a stacker crane for a low-rise automatic warehouse.

The mast 4 has two front pillars 6, 7 and one rear pillar 8, and the elevator is moved up and down using the front pillars 6, 7 as a lifting guide. On the rear side of the rear column 8, there is a cage 12 for inspection, 14 is a guide rail, and the cage 12 moves up and down along the guide rail 14. Reference numeral 16 denotes a lattice material for connecting the front pillars 6, 7 and the rear pillar 8, and may be a plate material or a pipe material. Reference numeral 18 denotes a flat plate material for connecting the front pillars 6, 7 to each other. 7 is in contact with almost the entire length, and 20 is an opening for lightening. The role of the plate member 18 is to disperse the pressing force when the front pillars 6 and 7 are locally pressed from the guide rollers 34 of the elevator in the direction connecting the front pillars 6 and 7. In addition, the rigidity of the front pillars 6 and 7 may be increased with respect to the direction connecting the front pillars 6 and 7 compared to the other directions. What is necessary is just to make it tighter than the connection with the rear column 8, and the reinforcement by the plate material 18 is an example.

Reference numeral 21 denotes a duct mounting plate, and reference numerals 22 and 23 denote ducts mounted on the duct mounting plate 21.
2 accommodates, for example, a power wiring 24 and the duct 23 accommodates, for example, a signal wiring 25. In this way, for example, from the power supply line provided on the upper bogie 42 side of the stacker crane 2,
Electric power is supplied to the lower carriage 40 via the power wiring 24, and a signal between the upper carriage 42 and the lower carriage 40 is transmitted by the signal wiring 25.

The ropes 26 and 27 may be other hanging materials. The rope 26 raises and lowers the elevator 10, the rope 27 raises and lowers the counterweight 28, and connects the counterweight 28 and the ducts 22 and 23 to the mast 4. Housed in the inner hollow space. The mast 4 has a lifting platform on the front surface, a cage 12 on the rear surface, and an empty space on the rear side surface. Other members are attached to this portion. Here, the ladder 30 is attached to the right rear side surface of FIG. 1, and the left rear side surface of FIG. 1 is a spare space when it becomes necessary to attach another member.

Reference numerals 32 to 34 denote guide rollers, which are attached to the elevator, and guide the elevator by the side surfaces of the front pillars 6, 7. 2 in FIG.
Is a limiter, and the mast 4 is connected to a lower carriage 40 and an upper carriage 42.
And swingably attached to This swing range is limiter 3
In this case, the mast 4 is swingably attached to the upper and lower carts 40 and 42, respectively, but the mast 4 may be attached to at least one of the carts so as to swing. The reason for this is that when the positions of the upper and lower trolleys 40 and 42 do not overlap in the vertical direction, the mast 4 is swung to prevent excessive force from being applied. Instead of swinging the mast 4, the mast 4 may be displaceable along at least one of the upper and lower trolleys along the horizontal direction.

Reference numeral 44 denotes an elevating motor, which raises and lowers the elevating table 10 and the counterweight 28;
A drum 7 is a sheave 48, which guides the ropes 26 and the like to prevent interference with the cage 12. A control board 49 controls the stacker crane 2 and communicates with a ground control panel (not shown).

The elevator 10 will be described with reference to FIGS. Reference numeral 50 denotes a carrier, which is provided with a transfer means such as a slide fork 52. Reference numeral 54 denotes a pair of frames provided in the vertical direction. For example, arms 56, 56 provided above and below the pair are provided with a pair of guide rollers 32, 33, respectively. , The front pillars 6 and 7 are sandwiched from front and rear. A pair of guide rollers 34, 34 are supported on the upper and lower sides of a bracket 58, and the bracket 58 is mounted on a mounting plate 60 via an eccentric shaft 62, and the eccentric shaft 62 is fixed to the mounting plate 60 by a shaft 64.
Of course, the shaft 64 is eccentric from the center of the eccentric shaft 62.

When the bracket 58 swings with respect to the eccentric shaft 62, a pair of upper and lower guide rollers 34,
34 are guided so that both contact the side surfaces of the front pillars 6,7. Further, a pair of guide rollers 3 is attached to the bracket 58.
4 is provided to reduce the size of each guide roller 34 and reduce the distance that the guide roller 34 protrudes outside the side surface of the mast. In addition, since the eccentric shaft 62 can rotate about the shaft 64, the distance between the center of the bracket 58 and the side surfaces of the front pillars 6, 7 can be adjusted. The brackets 58 are attached to the frame 54 at, for example, a plurality of locations above and below, here, are attached to each frame 54 at two locations above and below, for example, four brackets are attached to each lifting platform. In the embodiment, the traveling direction of the stacker crane (the direction perpendicular to the line connecting the front columns 6 and 7 in the horizontal plane) is referred to as the front-back direction or simply the front-back direction, and the direction connecting the front columns 6 and 7 (slide). The direction in which the fork 52 moves in and out) is referred to as a lateral direction. In the front pillars 6 and 7, the lateral outer surface is referred to as a side surface.

FIG. 6 shows a bracket 58 and a mounting plate 60.
The relationship is shown in an enlarged manner. The guide roller 34 is supported by a bracket 58, and the bracket 58 is an eccentric shaft 62.
, The shaft 64 is fixed, and the eccentric shaft 62 is fixed so as not to rotate. When the attachment of the shaft 64 is loosened and the eccentric shaft 62 is rotated, the bracket 58 reciprocates in the horizontal direction in the drawing,
Can move between the position of the solid line and the position of the chain line in the figure. 50
m is a high mast, so the spacing between the front columns 6, 7 tends to vary for each stacker crane, and the spacing between the frames 54, 54 of the platform also tends to vary for each platform.
By the rotation of the eccentric shaft 62, the position of the guide roller 34 can be adjusted so as to come into contact with the side surfaces of the front pillars 6, 7.
Next, if only one of the upper and lower guide rollers 34, 34 comes into contact with the side surfaces of the front pillars 6, 7, the bracket 58 swings about the eccentric shaft 62 by the repulsive force from the front pillars 6, 7. The pair of upper and lower guide rollers 34 always contact the side surfaces of the front pillars 6 and 7.

Returning to FIG. 5, the eccentric load when the slide fork 52 is advanced will be described. When the slide fork 52 is advanced to a rack or a station (not shown), a large moment of force is applied to the lifting table 10 from the articles being transferred and the like, and this is supported by the guide rollers 34.
Since the moment of this force is large, as many guide rollers 34 as possible are simultaneously brought into contact with the side surfaces of the front columns 6 and 7 to disperse the force. Therefore, 4 above and below the frames 54, 54
A total of eight guide rollers 34 are provided by a bracket, and a pair of upper and lower guide rollers 34, 34 of one bracket are provided.
Simultaneously contact the side surfaces of the front pillars 6 and 7, thereby dispersing the force applied to the side surfaces of the front pillars 6 and 7. Further, the plate member 18 shown in FIG. 1 enhances the lateral rigidity of the front pillars 6, 7 and prevents the side faces of the front pillars 6, 7 from being deformed or fatigued. In this way, the thickness of the front pillars 6 and 7 is reduced, and the mast is lightened by withstanding the moment of the force when the slide fork 52 advances. By reducing the weight of the mast, the speed of stacker cranes, the height of automated warehouses,
Effects such as downsizing of the traveling motor can be obtained.

In the embodiment, the present invention is applied to a hollow column in which three columns are combined. However, the present invention can be applied to a conventional one-mast or two-mast mast. Alternatively, four pillars may be used instead of three pillars.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a mast of a stacker crane according to an embodiment.

FIG. 2 is a side view of the stacker crane according to the embodiment.

FIG. 3 is a side view of the elevator with the stacker crane according to the embodiment.

FIG. 4 is a front view of an elevator with a stacker crane according to the embodiment.

FIG. 5 is a plan view of an elevator with a stacker crane according to the embodiment.

FIG. 6 is an enlarged view showing a guide roller mounting bracket in the stacker crane according to the embodiment.

[Description of Signs] 2 Stacker crane 4 Mast 6, 7 Front pillar 8 Rear pillar 10 Elevating platform 12 Cage 14 Guide rail 16, 16 'lattice material 18 Plate material 20 Opening 21 Duct mounting plate 22, 23 Duct 24 Power wiring 25 Signal Wiring 26, 27 Rope 28 Counterweight 30 Ladder 32 to 34 Guide roller 36 Swing support 38, 39 Limiter 40 Lower carriage 42 Upper carriage 44 Elevating motor 46 Drum 48 Sheave 49 Control plate 50 Luggage 52 Slide fork 54 Frame 56 Arm 58 Bracket 60 Mounting plate 62 Eccentric shaft 64 Shaft

Claims (3)

[Claims] 1. A stacker crane which raises and lowers a platform along a mast and guides a guide roller provided on the platform on the side surface of the mast. A guide roller is provided at least on each of the upper and lower sides of the bracket, and the guide rollers are guided by a side surface of a mast oriented in a direction substantially perpendicular to the traveling direction of the stacker crane. , Stacker crane. 2. The stacker crane according to claim 1, wherein an eccentric shaft is provided at a swing center of the bracket, and a distance between the bracket and the mast can be freely adjusted by rotation of the eccentric shaft. 3. The mast is constituted by a hollow column in which a plurality of column members are connected to each other, and at least two masts in the column member are formed.
A guide column is guided by the two column members, and the guide roller is guided by a side surface of the two column members in a direction substantially perpendicular to the traveling direction of the stacker crane. The stacker crane according to claim 1, wherein the guide roller guides another guide roller provided in the stacker crane.