JP2004182453A - Running guide device for stacker crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a running guide device for a stacker crane capable of holding the stacker crane on a running rail at stable attitude even when applying abrupt braking with reduced cost. <P>SOLUTION: This running guide device 1 for the stacker crane is constituted in such a way that a pair of guide rollers 6 which come into rolling contact with both side faces 5 of a head top part 2 are provided in a frame 41 of an under carriage 40 of the stacker crane 4 running on a rail 3 on which width of the head top part 2 is increased, and collar parts 8 engaging with a lower face 7 of the head top part 2 are each formed on peripheral faces of the pair of guide rollers 6. The pair of guide rollers 6 nip the rail 3 from both sides and oppose mutually. Four guide rollers 6 in total are arranged on a lower face of the frame 41 in such a way that two guide rollers each are arranged at an interval in the direction of running. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a traveling guide device of a stacker crane that travels unmanned and moves articles (articles) into and out of a storage shelf and transfers the articles.
[0002]
[Prior art]
Conventionally, a technique is known in which a rack (storage shelf) is constructed by bridging a plurality of horizontal frames over a plurality of pillars set up in a warehouse, and a stacker crane runs on a single running rail laid near this rack. It is. A stacker crane generally includes a chassis on which a drive device is mounted, and a fork or a bed that moves up and down along a mast that has been set up on the chassis. The undercarriage of such a stacker crane travels on a traveling rail by a driving wheel that presses a tread surface against the top surface of the traveling rail, and can be decelerated or stopped by braking the driving wheel with a friction brake or the like.
[0003]
The transported goods that enter and exit the stacker crane are stored in appropriate places on the rack, and a place where an operator or the like performing a warehouse operation transfers the transported goods to a fork or a bed of the stacker crane is at a predetermined position. The stacker crane stops at such a preset position while storing or transferring the transferred object. In the process of stopping the traveling stacker crane, the drive wheels of the chassis are gradually decelerated so that excessive inertial force is not applied to the stacker crane.
[0004]
An example of a technique for preventing the above-described undercarriage from running away from the traveling rail and preventing drive wheels of the undercarriage from falling off the traveling rail is disclosed in the following patent documents. That is, flanges are formed on both sides of the wheel that rotates around the horizontal axis to restrict the wheel from sliding out to the side of the traveling rail, or a plurality of guide rollers are provided together with the wheel on the upper and lower surfaces of the traveling rail. 2. Description of the Related Art A technique for positioning a wheel on a traveling rail by making rolling contact with a surface is well known.
[0005]
The transferred material loaded on the fork or the bed collapsed during the traveling of the stacker crane, or the transferred material slipped on the fork or the bed, and a part of the transferred material protruded outside the fork or the bed. In this case, it is necessary to stop the stacker crane urgently in order to avoid a situation in which a part of the transferred object collides with the rack and is damaged.
[0006]
The above-mentioned emergency stop is based on the operation of the stacker crane based on the operation of the emergency stop switch based on an electric signal transmitted from a sensor or the like that detects an abnormality of the transferred material on the fork or the loading bed, or the operation of the emergency stop switch determined by an operator or the like performing a warehouse operation. This is done by braking the wheels rapidly.
[0007]
[Patent Document 1]
JP-A-8-337167 [Patent Document 2]
Japanese Patent Application Laid-Open No. 7-232805
[Problems to be solved by the invention]
However, when the above-mentioned drive wheels are suddenly braked and the maximum deceleration force is generated, the position of the center of gravity increases due to the tendency of the stacker crane to rise and rise, and the excessive inertia force accompanying the sudden braking causes the stacker crane to move forward in the traveling direction. Moment to try to beat.
[0009]
For this reason, the rear part in the traveling direction of the undercarriage may rise from the traveling rail due to the above-mentioned moment, and on the contrary, a load collapse may be induced, or the drive wheels of the undercarriage may fall off from the traveling rail. Even if such a problem is applied to the undercarriage of the stacker crane, the technique of Patent Document 1 cannot be immediately solved. Further, according to the technology of Patent Document 2 described above, it is possible to prevent the chassis from being lifted off the traveling rail by the guide roller that is in rolling contact with the lower surface of the traveling rail. However, the number of parts increases and the mechanism becomes complicated, so that the manufacturing cost is increased. And maintenance becomes complicated.
[0010]
A guide rail is installed above the mast of the stacker crane to guide the upper end of the mast parallel to the traveling rail.However, the ordinary concrete roadbed on which the traveling rail is laid has some undulations. As the stacker crane travels along the rail, the stacker crane also slightly displaces up and down. For this reason, a play (clearance) is provided between the upper end of the mast and the guide rail to allow displacement of the stacker crane, so that the above-mentioned moment cannot be directly received by the guide rail.
[0011]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a traveling guide device for a stacker crane that can hold a stacker crane on a traveling rail in a stable posture even when braking suddenly. It is to provide at low cost.
[0012]
[Means for Solving the Problems]
The present invention relates to a traveling guide device for a stacker crane that travels on a rail with a widened crown, and a guide roller that rolls and contacts a side surface of the crown, and the head formed on a peripheral surface of the guide roller. And a flange engaged with the lower surface of the top.
[0013]
Further, the traveling guide device of the stacker crane according to the present invention is provided with the guide rollers in pairs at opposite positions on both sides of the rail.
[0014]
Further, in the traveling guide device for a stacker crane according to the present invention, a plurality of the guide rollers are arranged at intervals in a traveling direction of the stacker crane.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A traveling guide device for a stacker crane according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a front view of a stacker crane according to an embodiment of the present invention, and a side view thereof is shown in FIG. FIG. 3 is a schematic view of the traveling guide device of the stacker crane in the AA section of FIG.
[0016]
As shown in FIG. 3, the traveling guide device 1 of the stacker crane comes into rolling contact with the frame 41 of the chassis 40 of the stacker crane 4 traveling on the rail 3 whose head portion 2 is widened, and on both side surfaces 5 of the head portion 2. A pair of guide rollers 6 is provided, and a flange 8 that engages with the lower surface 7 of the crown 2 is formed on the peripheral surface of the pair of guide rollers 6.
[0017]
As shown in FIGS. 1 and 2, the stacker crane 4 raises and lowers a fork 43 for loading a transported object 43 a along a gate-shaped mast 42 raised on a chassis 40. The undercarriage 40 has wheels 10, 11 for pressing the treads against the top surface 20 at the front and rear portions, respectively. The front part and the rear part of the chassis 40 are names used to distinguish the direction of the chassis 40 with respect to the traveling direction of the stacker crane 4 (coincident with the longitudinal direction of the rail 3). 3 can reciprocate freely. The undercarriage 40 has a driving device 44 that uses an AC motor or the like as a prime mover.
[0018]
The driving force generated by the driving device 44 is transmitted to the wheels 11 at the rear of the chassis 40. That is, the stacker crane 4 travels using the wheels 11 as drive wheels, and the chassis 40 is supported on the rail 3 in a horizontal posture by both wheels 10 and 11. In this state, the portal mast 42 is in a vertical posture. The fall of the portal mast 42 in the vehicle width direction (coincident with the width direction of the rail 3) is regulated by the guide rail 45 installed above the portal mast 42. The point that the wheels 11 are braked when stopped is the same as in the prior art.
[0019]
The rail 3 applied to the stacker crane 4 includes a traveling rail used for a railway or the like. In the standard, a light rail referred to in JIS is generally used (12 to 30 kg rail). The shape is not particularly limited as long as the side surface 5 of the crown 2 protrudes from the web 9 and the cross section has the lower surface 7 between the crown 2 and the web 9. An I-beam may be used as the rail 3.
[0020]
When two or more rails 3 are joined, a pair of joint plates 94 sandwiching from both sides while laying over these webs 9 are arranged at rail joints between the rails 3 butted against each other. Then, a nut 93 is tightened together with a washer 91 and a spring washer 92 on a plurality of bolts 90 (one is illustrated, the other overlaps in the figure) penetrating the pair of joint plates 94 and each web 9. Thereby, the rails 3 butted against each other can be connected.
[0021]
A ground flange 30 is formed below the rail 3. The grounding flange 30 is installed on a concrete roadbed 31 via a floor plate 32. The ground flange 30 is sandwiched between the floor plate 32 and the clamp 33, and the bolt 34 screwed to the concrete floor 31 is fastened together with the spring washer 35, thereby fixing the lower part of the rail 3 to the concrete floor 31.
[0022]
As shown in FIG. 3, the pair of guide rollers 6 are arranged near the wheels 10, that is, on the lower surface of the frame 41 at the front of the chassis 40. In the figure, one of the pair of guide rollers 6 is represented by an imaginary line, and details are omitted. Although not shown, a pair of guide rollers 6 similar to the guide rollers 6 of FIG. 3 are also arranged near the wheels 11, that is, on the lower surface of the frame 41 at the rear of the chassis 40.
[0023]
Since the stopping or deceleration of the stacker crane 4 is performed by braking the wheels 11, if the wheels 11 are suddenly braked when the stacker crane 4 travels toward the wheels 10 (forward in FIG. 2), the stacker crane 4 Moment tends to lift the wheels 11. Therefore, the frictional force between the wheel 11 and the rail 3 is reduced, and the deceleration is also reduced accordingly. When the stacker crane 4 travels toward the wheels 11 (retreats in FIG. 2) and suddenly brakes the wheels 11, a moment is generated to lift the wheels 10 with the wheels 11 as fulcrums. For this reason, the wheel 11 is more strongly pressed against the rail 3, and the deceleration force also increases. That is, the moment generated in the stacker crane 4 is larger when the stacker crane 4 moves backward. Therefore, it is indispensable to provide the collar 8 on the wheel 10. The flange 8 of the wheel 11 may be omitted.
[0024]
That is, a total of four guide rollers 6 are disposed on the lower surface of the frame 41 at intervals in the traveling direction of the chassis 40. The pair of guide rollers 6 are provided at positions facing each other so as to sandwich the rail 3 from both sides thereof. This is not an essential requirement, and a pair (two) or three or more guide rollers 6 may be arranged at intervals in the running direction of the chassis 40 so as to be alternated.
[0025]
The flange portion 8 is a flange formed by raising a part of the peripheral surface of the guide roller 6, a continuous protrusion (convex), or a group of intermittent protrusions. The shape of the flange 8 is not particularly limited, and may be any shape as long as it protrudes from the peripheral surface of the guide roller 6 so as to enter directly below the lower surface 7 of the crown 2. FIG. 3 shows a form in which the flanges 8 are respectively formed on the guide rollers 6 on both sides of the rail 3. However, the flanges 8 may be formed on only one of the guide rollers 6. The guide roller 6 and the flange 8 need not be formed of an integral member as shown in FIG. 3, and the guide roller 6 and the flange 8 may be separate members.
[0026]
An example of the structure of each guide roller 6 will be described. That is, inside the guide roller 6, two radial bearings 60 are provided one above the other, and the upper end of the support shaft 61 inserted into these two radial bearings 60 protrudes toward the upper surface of the frame 41. That is, the guide roller 6 rotates around the support shaft 61. A hexagonal head 62 is formed at the lower end of the support shaft 61 to engage with the inner race of the lower radial bearing 60. A male screw is formed at the upper end of the support shaft 61, and a nut 65 is tightened together with the washer 63 and the spring washer 64 from the upper surface side of the frame 41. A spacer 66 is interposed between the inner race of the upper radial bearing 60 and the lower surface of the frame 41.
[0027]
The present invention can be implemented in various modified, modified, and modified forms based on the knowledge of those skilled in the art without departing from the spirit of the present invention.
[0028]
【The invention's effect】
According to the traveling guide device of the stacker crane according to the present invention, since the flange portion is formed on the guide roller that is in rolling contact with the side surface of the top of the rail, the stacker crane is suddenly braked, and the excessive inertia force accompanying this Therefore, even if a moment is generated to tilt the stacker crane forward in the traveling direction due to the above, such a moment is received by the flange. In other words, even if the rear of the chassis of the stacker crane tends to rise from the traveling rail due to the above moment, this can be controlled by the flange formed on the peripheral surface of the guide roller being hooked on the lower surface of the crown.
[0029]
Therefore, at the time of sudden braking, the entire stacker crane does not lean forward in the traveling direction, and it is possible to prevent the collapse of the load, the falling off of the stacker crane from the traveling rail, and the like. In addition, since the guide roller has a simple structure in which only a flange is formed, the structure of the mechanism is simple without increasing the number of parts. For this reason, there are advantages that the manufacturing cost can be reduced and maintenance can be easily performed.
[0030]
Furthermore, according to the traveling guide device of the stacker crane according to the present invention, since the guide rollers are provided in pairs at opposite positions on both sides of the rail, the rear portion of the chassis of the stacker crane is moved from the traveling rail at the time of sudden braking. In the case of rising, this can be restricted by the fact that the flanges of the pair of guide rollers are simultaneously caught on the lower surface of the top of the head. Accordingly, a larger moment can be received while being dispersed by the pair of guide rollers, and the reliability of the travel guide device can be improved.
[0031]
Further, according to the traveling guide device for a stacker crane according to the present invention, the above-described effects can be obtained regardless of the traveling direction of the stacker crane. That is, the moment generated during sudden braking is a force that causes the rear portion of the stacker crane to rise by tilting the stacker crane forward in the traveling direction. It is the power to lift the front.
[0032]
Therefore, if a plurality of guide rollers are arranged at intervals in the traveling direction of the stacker crane, even if any of the front and rear portions of the stacker crane tends to rise from the traveling rail at the time of sudden braking, this is ensured. Can be blocked.
[Brief description of the drawings]
FIG. 1 is a front view of a stacker crane according to an embodiment of the present invention.
FIG. 2 is a side view of the stacker crane according to the embodiment of the present invention.
FIG. 3 is an AA cross-sectional view of the traveling guide device of the stacker crane according to the embodiment of the present invention.
[Explanation of symbols]
1: traveling guide device of stacker crane 2: top 3: rail 4: stacker crane 5: side 6: guide roller 7: lower surface 8: flange

Claims (3)

A traveling guide device of a stacker crane that travels on a rail whose head is widened,
A travel guide device for a stacker crane, comprising: a guide roller that is in rolling contact with a side surface of the top of the head, and a flange formed on a peripheral surface of the guide roller and engaging with a lower surface of the top of the head. The traveling guide device for a stacker crane according to claim 1, wherein the guide rollers are provided in pairs at opposite positions on both sides of the rail. The traveling guide device for a stacker crane according to claim 1 or 2, wherein a plurality of the guide rollers are arranged at intervals in a traveling direction of the stacker crane.

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