JPH04350098A - Stacker crane - Google Patents

Abstract

PURPOSE:To reduce a friction resistance to generate at a stacker crane, and provided the stacker crane at a low facility cost. CONSTITUTION:For a stacker crane 4 having a cage 12 freely capable of elevation in a storage facility, and a post 18 equipped with a fork 20 installed on a carriage 15 in the cage 12, a pair of sprockets 25a-25d are installed at each of an upper and a lower part of the cage 12. A chain 26a is wound between the sprockets 25a-25d, and a second chain 26b is wound endlessly between the lower pair of the sprockets 25c, 25d, while the upper end of the post 18 is connected with the first chain 26a, with the carriage 15 connected with the second chain 26b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a stacker crane which is applied to coil storage equipment and the like to store or take out strip coils and the like.

0002

2. Description of the Related Art FIGS. 3 and 4 show the installation of a stacker crane used to store and take out strip coils from storage equipment.

As shown in the figure, the storage facility includes a plurality of vertical frames 1.
A plurality of storage chambers 3 are formed by the and shelves 2, and a stacker crane 4 is located and installed in a passage 5 within this storage facility.

[0004] The stacker crane 4 has a cart 8 that can run freely on rails 6 laid in the passage 5 via wheels 7.
It consists of a pair of main pillars 9 erected on the trolley 8, and a cage 12 suspended between the pair of main pillars 9 via a hoisting device 10 and a hoisting wire 11 so as to be able to rise and fall freely. Ru.

As shown in FIGS. 5 to 7, the cage 12 has an outer shell formed by a cage frame 12a, and is moved via wheels 14 held between a pair of upper and lower rails 13a and 13b laid inside the cage frame 12a. A fork carriage 15 is freely housed. This fork truck 15 is driven by a drive chain 16.

[0006] Also, on the fork carriage 15, a carriage frame 1 is mounted.
7 is installed, and a post 18 is erected in the center of this bogie frame 17 so as to be freely pivotable by a post rotation device 19, and furthermore, a post 18 is inserted into the center hole of a coil 30 at a midway position to support the coil 30. A fork 20 is provided to protrude laterally.

The stacker crane 4 is constructed as described above, and the main column 9 can freely run on the rail 6 using a separate traveling mechanism, and the cage 12 is raised to a predetermined height by a hoisting device 10 and a hoisting wire 11. The fork carriage 15 can be freely raised and lowered by a drive chain 16.
This allows the fork 20 to be fitted into and removed from the center hole of the coil 30 by moving within the cage frame 13.

[0008]

In the conventional stacker crane described above, when the fork 20 is inserted into the center hole of the coil 30 to support the coil 30, as shown in FIG. Frame 17 (i.e. post 18)
Since there is a distance L between them, an overturning moment W·L acts on the bogie frame 17.

Conventionally, the wheels 14 at both ends of the fork carriage 15 are sandwiched between rails 13a and 13b installed above and below to support the overturning moment (see FIG. 5). However, the weight of coils has been increasing recently, and as the weight increases, the overturning moment also increases, so the support structure needs to be made larger and stronger accordingly, leading to an increase in equipment costs. In addition, when moving the fork trolley 15, it is necessary to overcome the frictional resistance between the wheels 14 and the rails 13a and 13b, but since the frictional resistance increases with the weight of the coil, the capacity of the drive device must also be increased. As mentioned above, there was a problem in that it led to an increase in equipment costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a stacker crane that effectively reduces the frictional resistance generated in the device and has low equipment costs.

[0011]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a structure that includes a cage that is movably suspended on a pair of main pillars that can freely travel within a storage facility, and a carriage that is mounted on a carriage within the cage. In the stacker crane, a pair of winding transmission wheels are respectively installed at the upper and lower parts of the cage, and the first winding transmission wheel is installed at the upper and lower parts of the cage. is wrapped endlessly between the entire winding transmission wheels, and the second winding intermediate joint is wound endlessly between the lower pair of winding transmission wheels, and the upper end of the post is wrapped around the first winding intermediate joint, and the second winding intermediate joint is wound endlessly between the lower pair of winding transmission wheels. It is characterized in that the cart is connected to the second winding medium section.

0012

[Operation] According to the above structure, when the coil is supported by the fork, the overturning moment acting on the post is transmitted to the first winding intermediate node wound between the full winding transmission wheels and the lower pair of winding transmission wheels. Through the second winding intermediate node wound between the cars, equal size occurs at the connection point between the first winding intermediate node and the upper end of the post, and at the connection point between the second winding intermediate node and the truck. It will be canceled out by the reaction force in the same direction. Further, by driving the lower winding transmission wheel by a separate means, the cart can freely move within the cage via the first and second winding intermediate nodes.

[0013]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings. Note that the same devices and parts as in the prior art are denoted by the same reference numerals, and redundant explanation will be omitted.

FIG. 1 shows the main parts of the stacker crane of the present invention. Inside the cage frame 12a of the cage 12, a pair of sprockets 25a and 25b are located at the upper part of the inner wall and serve as winding transmission wheels. However, a pair of sprockets 25c and 25d are located at the bottom and also serve as wrap-around transmission wheels.
is installed. And all these sprockets 25
a, 25b, 25c, and 25d, a first chain 26a as a winding medium is endlessly wound and stretched,
Also, between the sprockets 25c and 25d installed at the bottom, there is also a second chain 26b, which also serves as a winding medium.
is endlessly wound and stretched. In other words, as shown in FIG. 2, the lower sprockets 25c and 25d have
Teeth 27a and 27b are implanted in two rows, with first and second rows respectively.
The second chains 26a and 26b are fitted together.

[0015] Also, the lower sprockets 25c and 25d
On the second chain 26b stretched between them, a fork trolley 15 having a fork 20 and a pivotable post 18 erected by a separate means is installed, and is connected to the second chain 26b at point a. ing.

Further, the post 18 is connected to a first chain 26a at a point b via the truck frame 17. That is, by driving the sprocket 25c or 25d by a separate means, the carriage 15 (i.e., the post 18
, the bogie frame 17) is connected to the first and second chains 26a, 26b.
It is possible to freely reciprocate within the cage frame 15 via the cage frame 15.

The other configurations are the same as those in FIGS. 3 and 4, so detailed explanation will be omitted here with reference to FIGS. 3 and 4.

Next, the operation of the present invention will be explained. In FIG. 1, when the coil 30 is supported by the fork 20, the supporting load W acts on the post 18, causing a moment W·L that tends to overturn the post counterclockwise, and the upper end of the post 18 and the first chain A leftward reaction force R is generated at the connection point b with 26a. Then, the chain 26a is pulled to the left by this reaction force R, and the reaction force is transmitted to the second chain 26b via the chain 26a and the lower sprockets 25c and 25d, and the second chain 26b is
A reaction force R' in the same direction is generated at the connection point a between b and the truck 15. At this time, R≒R', etc., and the moments acting on the post 18 are eventually canceled out.

Further, the coil 30 supported by the fork 20
For example, when moving the trolley 15 to the left as indicated by the dotted line in the figure, when the sprocket 25c (or 25d) is rotated counterclockwise, the rotation is caused by the rotation of the second chain 26b and Other sprockets 25d, 25a, 2 via the first chain 26a
5b is also rotated counterclockwise, so in the end, the trolley 15
will move to the left at the same speed via the upper and lower connecting points a and b. When moving to the right, the sprocket 25c may be rotated clockwise.

[0020] Furthermore, the sprockets 25a, 25b, 25
If the present drive mechanism, which is composed of c and 25d and the first and second chains 26a and 26b, is installed at symmetrical positions with the trolley 15 in between, the movement thereof will be performed more smoothly.

[0021] Furthermore, the present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the gist of the present invention, such as changing the drive mechanism to toothed belt transmission.

[0022]

Effects of the Invention As described above in detail, the stacker crane of the present invention has a pair of winding transmission wheels installed at the upper and lower parts of the inner wall of the cage, respectively, to connect the first winding intermediate joint. The second winding intermediate joint is endlessly wound between the lower pair of winding transmission wheels between the full winding transmission wheels, and the upper end of the post is connected to the first winding intermediate joint, and the trolley is wrapped around the upper end of the post. Since they are connected to the second winding intermediate nodes, when the coil is supported by the fork, the moment acting on the post is transferred to the first winding intermediate node wound between the entire winding transmission wheel and the lower pair of windings. Via the second wrapping intermediate node wound between the hanging power transmission wheels, it occurs at the connection point between the first wrapping intermediate node and the upper end of the post and the connection point between the second wrapping intermediate node and the trolley, respectively. This is offset by reaction forces of equal magnitude and in the same direction, so that no unreasonable frictional resistance is generated in the device, and the trolley can move smoothly while supporting the coil. Therefore, the support structure can be made smaller and the capacity of the drive device can be reduced, and equipment costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a stacker crane drive mechanism showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a lower sprocket.

FIG. 3 is an overall layout diagram of coil storage equipment to which the present invention is applied.

FIG. 4 is a side view as well.

FIG. 5 is a front view of a conventional stacker crane drive mechanism.

FIG. 6 is a side view as well.

FIG. 7 is a plan view as well.

[Explanation of symbols]

12 Cage 12a Cage frame 14 Wheel 15 Fork truck 17 Truck frame 18 Post 20 Fork 25a, 25b, 25c, 25d Sprocket 26
a First chain 26b Second chain 30 Coil

Claims (1)

[Claims] Claim 1: A cage that is movable up and down on a pair of main pillars that can run freely in a storage facility, and a post that is rotatably erected on a cart inside the cage and has a fork at an intermediate position. In the stacker crane, a pair of wrap transmission wheels are installed at the upper and lower parts of the cage, respectively,
The first wrapping medium is fully wrapped between the transmission wheels, and the second
The winding media nodes are endlessly wound between the pair of winding transmission wheels at the bottom, and the upper end of the post is connected to the first winding media node, and the cart is connected to the second winding media node. A stacker cleaner that is characterized by the following.