JPH08231010A - Stacker crane - Google Patents

Abstract

PURPOSE: To reduce noise produced from the traveling wheel parts at the traveling time without deteriorating rigidity and durability of the traveling wheels. CONSTITUTION: A traveling wheel 61 is composed of a metal inner wheel 62 fitted to a traveling rotary shaft 60, a visco-elastic polymer layer 63 of a minute thickness formed on the outside of the inner wheel 62, and a metal outer wheel 64 fitted to the outside of the visco-elastic polymer layer 63. On the driving side interlocking with a traveling drive motor, a protrusion is formed on the peripheral surface of the traveling rotary shaft 60 and a groove corresponding to the protursion is formed on the inside circumferential surface of the inner wheel 62, while the peripheral surface of the inner wheel 62, the inside circumferential surface of the outer wheel 64, and the inner circumferential surface and the peripheral surface of the visco-elastic polymer layer 63 are made in a minute uneven surface. The sectional form of the peripheral surface of the visco-elastic polymer layer 63, the inner circumferential surface of the outer wheel 64, and the inner circumferential surface and the peripheral surface of the visco-elastic polymer layer 63 may be made in a polygon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacker crane that travels on rails on the ground by the rotation of traveling wheels.

[0002]

2. Description of the Related Art Conventionally, an automatic warehouse having a rack device having a plurality of article storage shelves arranged vertically and horizontally and a stacker crane traveling along metal rails arranged on the ground in the vicinity of the rack device. It has been known. A stacker crane is a traveling carriage that has traveling wheels that rotate on rails, and is movable up and down along a mast that is erected on the traveling carriage, and has a slide fork for exchanging articles with a rack device or the like. And a lifting platform provided.

[0003]

However, in the conventional stacker crane as described above, the traveling wheels for traveling on the rails are made of metal like the rails, and the traveling wheels during traveling of the stacker crane. Noise is generated from the metal contact part between the rail and the rail. In order to reduce the noise generated during traveling, it has been proposed to provide a flexible member on the outer peripheral portion of the traveling wheel to reduce the surface pressure of the metal contact surface with respect to the rail of the traveling wheel. However, since the lower flexible body is easily elastically deformed, the rigidity and durability of the traveling wheels are deteriorated, and it is difficult to use the heavy-duty pallet crane or the like.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce the noise generated from the traveling wheel portion during traveling without deteriorating the rigidity and durability of the traveling wheel.

[0005]

In order to achieve the above object, the invention according to claim 1 is a stacker crane which travels on a rail on the ground by the rotation of a traveling wheel made of metal, the traveling crane having a rotating shaft. The stacker crane has a viscoelastic resin layer formed between the outer wheel mounting portion and the outer wheel.

According to a second aspect of the present invention, the inner peripheral surface of the outer wheel and the outer peripheral surface of the mounting portion are finely roughened surfaces.

According to a third aspect of the present invention, the cross-sectional shapes of the inner peripheral surface of the outer wheel and the outer peripheral surface of the mounting portion are polygonal.

[0008]

According to the invention of claim 1, the strain of the outer wheel is absorbed by the viscoelastic resin layer formed between the outer wheel mounting portion and the outer wheel with respect to the traveling rotary shaft, and is generated from the traveling wheel portion. Noise is reduced. Further, since the viscoelastic resin layer does not come into direct contact with the rail, the rigidity and durability of the traveling wheel do not deteriorate.

According to the second aspect of the present invention, since the inner peripheral surface of the outer wheel and the outer peripheral surface of the mounting portion thereof have fine irregularities, the outer wheel and the mounting portion thereof are engaged with each other by the engagement of the concave portion and the convex portion. Slip (in the viscoelastic resin layer) is prevented and the rotation of the mounting portion is reliably transmitted to the outer wheel.

According to the third aspect of the present invention, since the inner peripheral surface of the outer wheel and the outer peripheral surface of the mounting portion thereof have a polygonal cross-sectional shape, the outer wheel and the outer wheel can be formed by fitting the respective sides of the polygon. Slip (with the viscoelastic resin layer) with the mounting portion is prevented, and rotation of the mounting portion is reliably transmitted to the outer wheel.

[0011]

EXAMPLES Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to these examples without departing from the gist of the present invention. In this specification, the front means the lower side of FIG. 1, the rear means the upper side of FIG. 1, the left means the left side of FIG. 1, and the right means the right side of FIG.

A pair of front and rear rack devices 1 are erected on the floor so as to open the stacker crane passage 10.
The rack device 10 includes a large number of front columns 2 arranged at right and left at predetermined intervals, rear columns 2 arranged behind the front columns 2 with a predetermined space therebetween, and front and rear columns 2. It has a large number of article support members 4 provided at a predetermined interval in the height direction, and the article storage members 3 are constituted by the article support members 4 that face each other without the columns 2. A fork passage interval 5 is provided between the pair of left and right article support members 4 to allow the vertical movement of a slide fork 17, which will be described later. Incidentally, the loading / unloading port 6 of the article storage rack 3 is on the slide fork passage 10 side, that is, the loading / unloading ports 6 of the article storage racks 3 of the front and rear rack devices 1 face each other.

On the left side of the rack device 1, there is provided a loading / unloading roller conveyor 8 whose carrying direction is left and right. A known article elevator (not shown) is provided on the rack device 1 side of the loading / unloading roller conveyor 8. This article elevator is provided with a lift table that can be lifted and lowered by a known lift device below the rollers of the loading / unloading roller conveyor 8, and a pair of bearings that are erected on the lifting table and are located between the rollers of the loading / unloading roller conveyor 8. A frame, and by lifting the article W by the support frame, a fork insertion interval is formed between the transport surface of the loading / unloading roller conveyor 8 and the lower surface of the article W, or by the support frame in the raised position. The article W is received from the slide fork 17 and then lowered to move in and out the roller conveyor 8
It has the function of lowering the article W.

A pair of upper and lower guide rails 11 are arranged in the stacker crane passage 10 so that the longitudinal direction thereof is oriented in the left-right direction, and the stacker crane 13 is guided by these guide rails 11 so as to be movable left and right. The stacker crane 13 includes a traveling carriage 14, an elevating stand 16 which can be raised and lowered by a pair of masts 15 provided on the traveling carriage 14, and a horizontal movement in the front-rear direction by a well-known advancing and retracting mechanism of the elevating stand 16. It has a slide fork 17 movably provided.

The traveling carriage 14 includes a traveling drive motor 50 disposed near the lower end of the left mast 15 and a traveling rotation shaft 60 (driving side) on the left side which rotates in association with the traveling drive motor 50. The vehicle is driven by a drive mechanism having traveling wheels 61 that are not fitted to the traveling rotating shaft 60. Incidentally, of the two left and right traveling rotary shafts, the right traveling rotary shaft 60 is a driven side and is rotated by traveling of the stacker crane 13.

The traveling wheel 61 includes an inner wheel 62 made of metal, which is fixed to the traveling rotation shaft 60, and a viscoelastic resin layer 63 having a minute thickness formed on the outer side of the inner wheel 62.
And an outer wheel 64 made of metal, which is fixed to the outside of the viscoelastic resin layer 63. The viscoelastic resin layer 6
3 has both viscosity and elasticity properties such as rubber and urethane.

The left traveling wheel 61 on the driving side will be described with reference to FIG. A protrusion is formed on the outer peripheral surface of the traveling rotary shaft 60, and a groove having a shape corresponding to the protrusion is formed on the inner peripheral surface of the inner wheel 62 on the outer side thereof. Further, the outer peripheral surface of the inner wheel 62 and the inner peripheral surface of the outer wheel 64, and the inner peripheral surface and the outer peripheral surface of the viscoelastic resin layer 63 are fine irregular surfaces (saw blade shape). With such a configuration, the rotation of the traveling rotary shaft 60 is reliably transmitted to the outer wheel 64 via the inner wheel 62 and the viscoelastic resin layer 63 without slipping. On the driven side, since the rotational resistance between the members is small (it is difficult to slip), the protrusion of the traveling rotary shaft 60 and the groove of the inner wheel 62, the inner wheel 62, the viscoelastic resin layer 63, and the outer wheel 64. Is not formed (see FIG. 4).

As another example of the slip prevention structure on the driving side, the outer peripheral surface of the inner wheel 62 and the outer wheel 6 are provided.
The cross-sectional shape of the inner peripheral surface of No. 4 and the cross-sectional shape of the inner peripheral surface and the outer peripheral surface of the viscoelastic resin layer 63 may be polygonal (FIG. 12).
reference). In this case, the fitting of the sides of the polygon prevents the slip (in the viscoelastic resin layer 63) between the outer wheel 64 and the inner wheel 62.

An elevation drive motor 51 is arranged at a position slightly above the mast 15 from the traveling carriage 14. The rotation of the lift drive motor 51 raises and lowers the lift table 16.

As is well known, the slide fork 17 performs the operations of projecting the article W downward, lifting the article W by raising the elevating table 16 and retracting the article W to the elevating table 16 side. The article W can be pulled down to 16, and the article W can be unloaded onto the article storage shelf 3 or the like by the reverse operation.

Each of the masts 15 has a main mast 2 formed by arranging a plurality of main mast constituent members 21 in the height direction.
0, and a reinforcing mast 23 in which a plurality of reinforcing mast components 24 are arranged in the height direction from the lowermost main mast component 21 to the uppermost main mast component 21. The connecting portion (butting portion) between the main mast components 21 and the connecting portion (butting portion) between the reinforcing mast components 24 are vertically displaced. The reinforcement mast 23 does not have to be provided over the entire main mast 20, and may be provided only in a portion of the main mast 20 that needs reinforcement. The lower ends of the main mast 20 and the reinforcing mast 23 are fixed to the traveling carriage 14 by known means (welding, bolting, etc.), and the upper ends thereof are fixed to the upper connecting member by known means. ing.

As shown in FIG. 3, guide rollers 19 of the lift 16 are provided at the front and rear of the main mast component 21.
A guide rail 18 for guiding the is integrally formed.

The main mast constituent member 21 and the reinforcing mast constituent member 24 are abutted against each other by a meshing structure, and in the vertical direction applied across the main mast constituent member 21 and the reinforcing mast constituent member 24. They are connected to each other by a connecting plate 26 which is long and has an engagement edge protruding from the longitudinal edge. That is, the main mast component 21 and the connecting plate 26 are provided with a plurality of bolts 28 through the through holes formed in the connecting plate 26, and have a groove 22 extending in the up-down direction and having a retaining edge formed on the main mast component 21. The reinforcing mast component 24 and the connecting plate 26 are connected to the reinforcing mast component 24 through the through holes formed in the connecting plate 26. It is connected by being screwed into a nut 29 fitted in a vertically long groove 25 having a formed retaining edge. The connecting portions (butting portions) of the connecting plates 26 are displaced from the connecting portions of the main mast constituent members 21 and the reinforcing mast constituent members 24, so that the strength is further increased. That is,
The connecting portions of the main mast constituent members 21 and the connecting portions of the reinforcing mast constituent members 24 and the connecting portions of the connecting plates 26 are vertically displaced so as not to be aligned.

The vertically adjacent main mast constituting members 21 are connected to each other by an inner connecting plate 31 and an outer connecting plate 32 which are straddled therebetween. That is, a large number of bolts 28 are connected to each other by fitting them into the screw holes formed in the inner connecting plate 31 through the through holes formed in the outer connecting plate 32 and the main mast component 21.

The reinforcing mast constituents 24 which are vertically adjacent to each other extend over the both and also from inside and outside.
4, the connecting plates 33a, 33 are pressed against each other.
b and the connecting plates 34a, 34b are connected to each other. By fitting a large number of bolts 28 into the screw holes formed in the inner connecting plate 33b through the through holes formed in the outer connecting plate 33a and the reinforcing mast component 24,
Also, a large number of bolts 28 are screwed into screw holes formed in the inner connecting plate 34b through through holes formed in the outer connecting plate 34a and the reinforcing mast component 24, and further, a large number of bolts 28 are connected to the connecting plate 34a. The reinforcing mast components 24 are connected to each other by screwing the nuts 29 fitted in the vertically long grooves 25 having the retaining edges formed in the reinforcing mast components 24 through the through holes formed in the. There is. Inner connecting plate 33b and connecting plate 34b
Is the connecting plate 33 through the through hole of the reinforcement mast component 24.
By temporarily fitting a plurality of temporary fixing bolts 36 into the screw holes formed in b and the connecting plate 34b, the temporary fixing bolts 36 are temporarily fixed to the reinforcing mast component 24. A head relief hole is formed in the outer connecting plate 33a and the connecting plate 34a for releasing the bolt head of the temporary fixing bolt 36.

In the main mast 20 and the reinforcing mast 23, urethane foam 53 having a very small specific gravity as compared with the respective masts 20 and 23 is filled inside the lowermost main mast forming member 21 and the reinforcing mast forming member 24. There is.
In addition, a plurality of filler injection ports for injecting the urethane foam 53 are formed on the side walls of the lowermost main mast component 21 and the reinforcement mast component 24.

Thus, in this embodiment, the inner wheel 6
Since the strain of the outer wheel 64 is absorbed by the viscoelastic resin layer 63 formed between the outer wheel 64 and the outer wheel 64, the traveling wheel 61 portion (especially the outer wheel 64 and the guide rail 11) when the stacker crane 13 travels. The noise generated from the contact part) is reduced. In the present embodiment, the "mounting portion of the outer wheel to the traveling rotary shaft" in the claims refers to the inner wheel 62, but when the inner wheel 62 is not provided, the traveling rotary shaft 60 is not provided.
Becomes

Further, the main mast 20 and the reinforcing mast 2
3 is configured by connecting a plurality of constituent members 21 and 24 in the height direction, and since the connecting portion of the main mast constituent member 21 and the connecting portion of the reinforcing mast constituent member 24 are displaced in the height direction, The strength can be further increased and the weight of the mast 15 can be reduced. Therefore, the contact pressure of the traveling wheels 61 with respect to the guide rails 11 can be reduced to further reduce the noise generated from the traveling wheels 61.

Further, since the viscoelastic resin layer 63 has a very small thickness, the outer peripheral shape of the traveling wheel 61 is hardly deformed by the weight of the stacker crane 13. In addition, the main mast component 21 and the reinforcement mast component 24
Mast 1 by urethane foam 53 filled inside
5 drive motor 5 without increasing the weight of
0, propagation of the vibration generated by the vibration source such as the lifting drive motor 51 to the mast 15 is suppressed, and thus the noise generated from the mast portion is also reduced.

[Brief description of drawings]

FIG. 1 is a simplified plan view with an intermediate omitted, showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view along the line II-II of FIG.

FIG. 3 is an enlarged view showing a wheel portion on a driving side.

FIG. 4 is an enlarged view showing a wheel portion on a driven side.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

7 is an enlarged cross-sectional view taken along line VII-VII of FIG.

8 is an enlarged sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a front view schematically showing a connected state of the mast.

FIG. 10 is a view taken along line XX of FIG. 9;

11 is a view taken along the line XI-XI of FIG.

FIG. 12 is an enlarged view showing another example of the drive-side wheel portion.

[Explanation of symbols]

 15 mast 20 main mast 21 main mast constituent material 23 reinforcing mast 24 reinforcing mast constituent material 50 traveling drive motor 51 lifting drive motor 53 urethane foam 60 traveling rotary shaft 61 traveling wheel 62 inner wheel 63 viscoelastic resin layer 64 outer wheel

Claims (3)

[Claims] 1. A stacker crane which travels on a rail on the ground by rotation of traveling wheels made of metal, wherein a stacker in which a viscoelastic resin layer is formed between a mounting portion of an outer wheel with respect to a traveling rotation shaft and the outer wheel. crane. 2. The stacker crane according to claim 1, wherein the inner peripheral surface of the outer wheel and the outer peripheral surface of the mounting portion are minute uneven surfaces. 3. The stacker crane according to claim 1, wherein the inner peripheral surface of the outer wheel and the outer peripheral surface of the mounting portion have a polygonal cross-sectional shape.