JPH0212841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stacker crane having a movable step for loading and unloading long objects such as shaped steel and frame materials onto and off shelves.

Conventionally, when loading and unloading cargo manually between the lifting platform and multi-tier stacking shelves of a stacker crane, a worker climbs onto the lifting platform and carries the cargo by hand. .

If the baggage is short, it can be carried in and out manually without any problems, but if the baggage is long, two workers can move the long baggage on the platform. It is necessary to carry objects in and out by holding both ends with your hands.

However, since the long object placement position on the multi-tiered stacked shelf is deviated from the lifting platform in the left and right direction,
The worker on the lifting platform needs to lean his upper body out from the lifting platform while holding a long object in his hand.
As a result, there is a risk that workers may accidentally fall.
Additionally, there is a problem in that it is difficult to carry out loading and unloading operations.

SUMMARY OF THE INVENTION The object of the present invention is to provide a stacker crane with movable steps which can advantageously solve the above-mentioned problems.

Next, the present invention will be explained in detail using illustrated examples.

1 to 15 show an embodiment of the present invention, in which a multi-tier stacked shelf row 6 extending in the front-rear direction is arranged in parallel with a crane passage 1 in between. , shelf pillars 7 erected at intervals in the front-rear direction, beams 8 connecting each shelf pillar 7, and shelf members 4 fixed to each shelf pillar 7 in a single-beam manner at intervals in the vertical direction. The upper ends of adjacent multi-tier stacked shelf rows 6 are connected by a connecting member (not shown), and the lower end of each shelf pillar 7 is fixed to the floor 9.

A lower rail 10 extending in the longitudinal direction is laid and fixed on the floor 9 at the lower part of the crane passage 1, and an upper rail 11 arranged so as to extend in the longitudinal direction at the upper part of the crane passage 1 is attached to the lower surface of the connecting member. The lower rail 1 is installed and fixed across the
0 and the upper rail 11, the stacker crane 12 has a frame 16 consisting of a lower frame 13, an upper frame 14, and a vertical frame 15, and a hoisting machine 1 fixed to the frame 16.
A traveling drive device 18 is fixed to the lower frame 13, and traveling wheels 19 and lower guide rollers 2 are provided.
Further, upper guide rollers 21 are attached to the upper frame 14, and vertical guide rails 22 fixed to the vertical frame 15 are installed at the center of the front end and the center of the rear end of the lifting platform 2. A guide roller 23 is attached.

The elevating cargo platform 2 extends in the front and back direction, and fixed steps 70 are provided at the upper portions of both front and rear sides of the elevating cargo platform 2, and fixed steps 70 are provided on both left and right sides of the front of the elevating cargo platform 2 and on both left and right sides of the rear portion of the elevating cargo platform 2, respectively. A movable step 3 is disposed at the bottom of the fixed step 70, and two support rails 24 extending in the left-right direction and having a U-shaped cross section are disposed at the bottom of the movable step 3 at intervals in the front-rear direction. The rail 24 is fixed to the lifting platform 2, and a number of load supporting rollers 25 and lateral guide rollers 26 are provided at the front and rear lower portions of the movable step 3.
The rollers 25 and 26 are arranged in the grooves of the support rail 24, and a rack 27 extending in the left and right direction is fixed to the lower part of the movable step 3. A fence 28 is fixed to the end.

At the lower part of the movable step 3, a movable step drive device 5 consisting of an electric motor with a speed reducer is fixed to a support rail 24, and a support shaft 29 extending in the front and back direction is installed on the support rail 24, and a pinion that engages with the rack 27 is fixed to the support rail 24. 30 and a driven sprocket 31 that rotates integrally therewith are rotatably fitted onto the support shaft 29, and are further connected between the driven sprocket 31 and a drive sprocket 32 fixed to the output shaft of the movable step drive device 5. A transmission chain 33 is wound around the movable step 3, and a striker 34 is fixed to the lower part of the movable step 3. A limit switch LS ₁ for regulating the protruding position and a limit switch LS ₂ for regulating the retracted position operated by the striker 34 are attached to the support rail 24. The movable step drive device 5 moves the movable step 3 through the drive sprocket 32, the transmission chain 33, the driven sprocket 31, the pinion 30, and the rack 27 to the position where the movable step 3 is stored in the lifting platform 2 and the front and rear shelves 4. moved to a protruding position in between.

Driver's cabs 35 and 36 are fixed to the upper center of the front end and the upper center of the rear end of the elevating loading platform 2, and a girder 37 extending along the front-rear direction is constructed and fixed over the upper part of the driver's cabs 35 and 36, and the girder 37 A trolley rail 38 extending in the front-rear direction is fixed to the lower surface of the vehicle, and a ring-shaped hanging device 40 is fixed to a trolley 39 that moves while being guided by the trolley rail 38. A ring-shaped hanging device 40 is connected to the passenger safety belt. A synthetic fiber rope (not shown) is removably secured thereto.

A plurality of conveyor conveyors 41 consisting of roller conveyors are provided at intervals in the longitudinal direction of the lifting platform 2, and the conveyors 4
1 has a large number of rollers 42 that extend in the front-rear direction and are arranged at intervals in the left-right direction, and each of the conveyors 41 is The roller 42 is driven at a constant speed via a transmission mechanism (details not shown) consisting of a chain and a sprocket.

Telescoping safety fences 44, 45 are arranged at the front and rear portions on both the left and right sides of the lifting platform 2, and each telescoping safety fence 44, 45 has a large number of fence posts 46 arranged at intervals in the front and rear direction, A bendable horizontal fence member 48 consisting of a pair of links 47 connecting the upper and lower parts of adjacent fence posts 46, a wheel support member 49 fixed to the lower end of each fence post 46, and a wheel support member 49 attached to the wheel support member 49. It is composed of a plurality of upper wheels 50 and a plurality of lower wheels 51 attached.

An upper rail 52 for a fence and a lower rail 53 for a fence, which extend in the front-rear direction, are located at a position facing both left and right sides of the front part of the lifting platform 2 and a position facing both left and right sides of the rear part of the lifting platform 2, respectively, in the vertical direction. The upper part of the upper fence rail 52 is fixed to an upper holding member 54 fixed to the side surface of the lifting platform 2, and the lower part of the lower rail 53 is fixed to the side surface of the lifting platform 2. is fixed to a lower holding member 55 fixed to the wheel supporting member 4.
Upper wheel 50 and lower wheel 5 attached to 9
1 is an upper fence rail 52 and a lower fence rail 5
3 is fitted.

An endless strip 56 consisting of an endless chain extending from the front end to the rear end is arranged on both the left and right sides of the lifting platform 2, and both ends of the endless strip 56 are attached to both the front and rear ends of the lifting platform 2. A plurality of guide sheaves 59 made of sprockets are wound around a reversing sheave 57 made of a sprocket, and the middle part of one of the longitudinally movable parts 58 of the endless strip 56 is attached to a plurality of guide sheaves 59 made of sprockets attached to the middle side of the lifting platform 2.
Furthermore, the intermediate part of the other longitudinally movable part 60 of the endless strip 56 includes a guide sheave 61 consisting of a sprocket attached to the middle side of the lifting platform 2, and an opening/closing sheave consisting of an electric motor with a speed reducer. The opening/closing drive device 62 is wound around a drive sheave 63 consisting of a sprocket fixed to the output shaft of the drive device 62, and the opening/closing drive device 62 is fixed to the lifting platform 2.

Wheel support member 49 at the end on the center side of the lifting platform in one of the telescoping safety fences 44 adjacent in the front-back direction
is connected to one back-and-forth movable portion 58 of the endless strip 56, and is connected to the other telescopic safety fence 45.
Wheel support member 4 at the end on the center side of the lifting platform in
9 is the other longitudinally movable portion 6 in the endless strip 56
0, and when the endless strip 56 is cyclically driven in the forward or reverse direction by the opening/closing drive device 62,
The ends of the front and rear telescoping safety fences 44, 45 on the center side of the lifting platform are simultaneously moved in the direction away from each other, or are simultaneously moved in the direction toward each other, so that the front and rear telescoping safety fences 44, 45 are opened and closed in synchronization. Further, a striker 64 is fixed to the wheel support member 49 at the end of the telescopic safety fence 45 on the central side of the lifting platform, and a limit switch LS ₃ for blocking and stopping and a limit switch LS ₄ for stopping opening operated by the striker 64 are connected to the lifting platform 2.
installed on.

Support rails 65 for supporting the horizontal portions of the longitudinally movable parts 58 and 60 of the endless strip 56 are arranged at the front and rear portions on both the left and right sides of the lifting platform 2, and the supporting rails 65 are held against the lifting platform 2. The lower part of the fixed safety fence 66 is fixed to both the left and right sides of the upper front end and the left and right sides of the upper rear end of the elevating loading platform 2, and the intermediate part of the fence post 46 in the telescoping safety fences 44 and 45. On the outside,
Support member 6 for preventing long objects from falling, made of steel wire coils
One end of 7 is fixed.

Next, an example of use of the stacker crane of the above embodiment will be explained.

When transporting long objects 68 such as steel sections, aluminum sections, and other building frame materials to a multi-tiered stacked shelf, a pallet 69 loaded with a large number of long objects 68, that is, a long object loading pallet, is used for transportation. It is placed on the conveyor 41 and transported by the stacker crane 12 to a position facing an arbitrary shelf. Next, when carrying long objects loaded onto a pallet onto a shelf, the telescoping safety fences 44 and 45 are first opened, and then the transport conveyor 41 is operated, and the pallet loaded with long objects is transferred to the shelf material 4. sent on top of. In addition, when carrying an appropriate number of long objects from the long object loading pallet to the shelf, the telescoping safety fences 44 and 45 are closed, and the front and rear movable steps 3 on the loading side are moved from the side of the lifting platform 2 to the front and back. The retractable safety fence 44 is protruded between the shelves 4, and then two workers lift one or more long objects from the long object loading pallet.
45 and walk from the fixed step 70 on the lifting platform 2 to the movable step 3, and lower the long object onto the shelf material 4.

When carrying out a long object 68 from the shelf, the telescoping safety fences 44 and 45 are closed, and the front and rear movable steps 3 on the carry-out side are projected from the side of the lifting platform 2 between the front and rear shelves 4, Next, two workers lift one or more long objects on the fence material and pass it over the telescoping safety fences 44, 45 from the movable step 3 to the fixed step on the lifting platform 2. 70
The long object is then dropped onto the pallet 69 placed on the conveyor 41.

Further, a long object delivery station (not shown) having a delivery conveyor is installed on the floor at the end of the multi-tier stacked shelf row, and the long object is delivered between the elevating loading platform 2 and the station. In this case, the transport conveyor 41 and the transfer conveyor may be driven in circulation in the same direction to transfer the long object.

In the embodiment described above, there are independent movable steps 3 on the left and right sides at the front and rear parts of the lifting platform 2, respectively.
However, instead of making the left and right movable steps independent, as shown in FIG. Steps may be provided at the front and rear parts of the lifting platform so as to protrude from one side and the other in the width direction of the lifting platform. In this case, the width of the lifting platform can be reduced and the number of step drive devices used can be halved.

Note that a wire rope may be used as the endless strip 56, and a chain may be used as the bendable horizontal fence member 48.

According to this invention, when the movable step 3 is caused to protrude from the lifting platform 2 between the front and rear shelves 4 by the movable step drive device 5, the step extending from the fixed step 70 on the lifting platform 2 between the front and rear shelves 4 is moved. is formed, so the worker can freely walk from the fixed step 70 on the lifting platform 2 to between the front and rear shelves 4, and therefore the worker can walk freely from the lifting platform 2 to the shelf 4. The long objects 68 can be carried in safely and easily and the long objects 68 can be carried out from the shelf material 4 to the lifting platform 2, and the steps that the worker can walk on are widened, giving the worker peace of mind. Furthermore, after the use of the movable step 3 is finished, the movable step drive device 5 allows the movable step 3 to be stored under the fixed step 70 on the lifting platform 2, so the stacker crane 12 can be moved without any hindrance. Effects such as being able to run the vehicle can be obtained.

[Brief explanation of drawings]

Figures 1 to 15 show an embodiment of the present invention, in which Figure 1 is a schematic plan view showing the relationship between a stacker crane and a long object storage shelf, and Figure 2 is a schematic plan view of the stacker crane. 3 is a partially cutaway side view showing a part of the stack crane on an enlarged scale. FIG. 4 is a partially cutaway plan view showing a part of the stacker crane. 6 is an enlarged sectional view taken along line A, FIG. 6 is an enlarged sectional view taken along line BB in FIG. 5, and FIG.
8 is a cutaway plan view showing one of the left and right movable steps, FIG. 9 is a partially cutaway side view showing the movable support portion of the telescopic safety fence in the lifting platform, and FIG. A side view showing a part of the retractable safety fence, Fig. 11 is a front view showing the vicinity of the attachment part of the support member for preventing falling of long objects to the fence post, and Fig. 12 is a sectional view taken along the line D-D in Fig. 9. , FIG. 13 is a sectional view taken along the line E-E in FIG.
The figure is a side view showing a state in which pallets are placed on a conveyor. FIG. 16 is a schematic plan view showing the relationship between a stacker crane and a long object storage shelf according to another embodiment of the present invention. In the figure, 1 is a crane passageway, 2 is a lifting platform, 3 is a movable step, 4 is a shelf material, 5 is a movable step drive device, 6 is a multi-tier stacked shelf row, 10 is a lower rail, 11 is an upper rail, and 12 is a stand. Tsuka crane, 17 is a hoisting machine, 18 is a traveling drive device, 24
is a support rail, 25 is a load support roller, 26 is a lateral guide roller, 27 is a rack, 28 is a shelf, 30 is a pinion, 31 is a driven sprocket,
32 is a drive sprocket, 33 is a transmission chain,
34 is a striker, 41 is a conveyor, 43
is a conveyor drive device, 44 and 45 are telescopic safety fences, 49 is a wheel support member, 50 is an upper wheel, 5
1 is a lower wheel, 52 is an upper rail for the fence, 53 is a lower rail for the fence, 56 is an endless strip, 62 is an opening/closing drive device, 63 is a drive sheave, 67 is a support member for preventing a long object from falling, 68 is a Long item, 69 is a pallet,
70 is a fixed step.

Claims (1)

[Claims] 1 Crane passage between rows of shelves extending in the front and back direction 1
Elevating and lowering loading platform 2 on a stacker crane running
A fixed step 70 is provided at the upper part of both the front and rear sides of the lift platform 2, and a movable step 3 is provided at the lower part of the fixed step 70 on the lift platform 2 at a position where it is stored in the lift platform 2 and between the front and rear shelves 4 from the side of the lift platform 2. mounted so that it can be moved to a protruding position,
A stacker crane having a movable step, characterized in that a movable step drive device 5 is provided on the lifting platform 2.