JPH0682012U - Slide fork load deviation prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent misalignment when loading luggage on the slide fork of the stacker crane and sliding it to the shelf receiving part of the loading / unloading station or rack and sliding it to its original position. [Structure] A sensor plate 33, which normally projects from the load mounting surface and descends when a load is placed, is provided on the load mounting surface of the slide fork 2, and the sensor plate 3
A stopper 31 that is interlocked with 3 and that descends when the sensor plate 33 projects and that projects when the sensor plate 33 descends is provided around the load mounting portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing displacement of a load placed on a slide fork such as a stacker crane.

[0002]

[Prior art]

 It has been well known that a stacker crane provided in an automatic warehouse can store and carry out luggage at predetermined positions of racks arranged on both sides in the traveling direction. When storing luggage in the rack using this stacker crane, first position the stacker crane at the loading / unloading station on the rack entrance side, project the slide fork toward the bottom of the loading / unloading station's luggage, and then move up and down in this state. The platform is lifted to lift the package, and the slide fork is returned to the platform to receive the package. Next, when the stacker crane travels to the desired shelf position, at the same time the elevator is raised and lowered, the slide fork is projected toward the upper part of the shelf receiver, and in this state, the elevator is lowered to load the luggage on the shelf receiver. Storage is completed by depositing and returning the slide fork to the lift table. The procedure for unloading luggage from the rack is the reverse of the above procedure.

[0003]

[Problems to be solved by the device]

 In such a stacker crane, especially when the slide fork of the slide fork is fast or the load is light, the load may shift when the slide fork slides. In some cases, it was not possible to store it in the location of or to carry it out.

[0004]

[Means for Solving the Problems]

 The present invention is configured as follows to solve the above problems. That is, a sensor portion that normally projects from the load mounting surface and that descends when a load is placed is provided on the load mounting surface of the slide fork, and it interlocks with the sensor portion and descends when the sensor portion projects. A stopper that protrudes when the sensor part descends is provided around the load carrying part.

[0005]

[Action]

 The use of such means has the following effects. When a load is placed on the load-carrying part of the slide fork, the sensor part, which normally projects from the load-carrying surface, is lowered. In conjunction with this, a stopper protrudes around the baggage to regulate the baggage position. Also, when the load is removed from the load placement part, the sensor part projects and the stopper descends in conjunction with this.

[0006]

【Example】

 The problems to be solved and the means for solving the problems of the present invention are as described above, and the structure of the embodiment will be described with reference to the accompanying drawings. Fig. 1 is a perspective view of a stacker crane, Fig. 2 is an exploded perspective view of a slide fork, Fig. 3 is a front sectional view of a top plate equipped with a load deviation preventing device of the present invention, and Fig. 4 is a state in which a load is also placed. FIG. 5 is a front sectional view showing another embodiment of the load deviation preventing device.

In the stacker crane arranged in the automated warehouse in FIG. 1, a traveling rail 14 is laid on the floor between racks, and an upper guide rail 13 is provided on the ceiling in parallel with the traveling rail 14. A stacker crane S is arranged between the traveling rail 14 and the upper guide rail 13 so as to be able to travel back and forth. The structure of the stacker crane S is such that an upper frame 7, a traveling body 8, a front mast 11 and a rear mast 12 are framed and arranged between the upper guide rail 13 and the traveling rail 14, A drive unit B on which traveling and lifting motors are mounted is arranged at the front portion, and an operation panel A is arranged at the rear portion of the traveling body 8 so that an operator can operate on step 24. An elevating table 1 is provided between the front mast 11 and the rear mast 12 so that it can be moved up and down.

A slide fork 2 is provided on the lift base 1, and a base plate 15 of the slide fork 2 is fixed on the lift base 1 as shown in FIG. A slide motor M is fixed, a middle plate 16 is slidably inserted on the base plate 15, and a top plate 17 is arranged on the middle plate 16 so as to be slidable to the left and right. The middle plate 16 and the base plate 15 are slidable. A drive chain 21 is stretched in between, and a midway portion of the drive chain 21 is wound around a sprocket fixed to the drive shaft of the slide motor M so that it can be driven, and the top drive chains 23L and 23R are respectively attached to the base plate. 15 through the guide part of the middle plate 16 to zigzag on both sides of the top plate 17. The slide fork 2 can be slid and projected rightward or leftward by driving the slide motor M forward or backward.

The load deviation prevention device of the present invention is provided on the top plate 17. That is, as shown in FIG. 3, stopper holes 17a, 17a are formed on the left and right sides of the front and rear sides of the top plate 17, and sensor holes 17b are opened at the centers of the front and rear sides, and the pivot shafts 30, 30 are formed below the stopper holes 17a, 17a. Is supported by the top plate 17 and laterally spanned, and the stoppers 31 and 31 are pivotally supported by the pivot shafts 30 and 30. The stopper 31 can be rotated to project and be housed in the stopper hole 17a. The lower end of 31 is pivotally supported on one end of the connecting links 32, 32, the other end of the connecting links 32, 32 is pivotally supported on the sensor plate 33, and the sensor plate 33 is pivotally connected at its center by a hinge or the like. Thus, the sensor portion is formed so as to be bendable, and the sensor plate 33 can be projected and stored from the sensor hole 17b.

The ends of the two connecting links 32, 32 are connected to each other by a spring 34, and the connecting plates 32, 32 are pulled to the center by the spring 34 to project the sensor plate 33 upward in a mountain shape. The stoppers 31 and 31 are laid down and urged so as to be positioned below the mounting surface of the top plate 17. However, the urging force of the spring 34 is expanded by the weight of the pallet 4 when it is placed as shown in FIG. 4, and is such a force as to project the sensor plate 33 when the pallet 4 is not placed, as shown in FIG. The number of stoppers and sensor parts of the load deviation prevention device is not limited.

With this configuration, when storing from the loading / unloading station or when carrying out luggage stored in the rack, the slide motor M of the stacker crane S is driven to move the slide fork 2 to the right or When it slides and protrudes to the left and the top plate 17 is positioned below the luggage W, the elevator 1 is raised slightly and lifted from the receiving / receiving station pedestal or the rack shelf pedestal, as shown in FIG. The sensor plate 33 is pushed down and is housed in the sensor hole 17b, the lower part is widened, the connecting links 32, 32 are moved left and right, and the stoppers 31, 31 rotate about the pivot shaft 30, 30. The tip of the lever stands upright at a right angle, projects from the stopper hole 17a, and is positioned on both sides of the load W (pallet 4).

By doing so, when the load W is placed on the slide fork 2 and left and right slides, the stopper 31 receives the force of the reaction to move the load in the opposite direction to the sliding direction. And prevent the deviation. If the length of the stopper 31 is longer than the height of the pallet 4 so that the load W is also received, the effect of preventing the load shift is further enhanced. Then, when the luggage W is placed on the rack tray or the pedestal of the loading / unloading station, the luggage W is separated from the top plate 17, and the urging force of the spring 34 causes the sensor plate 33 to project upward from the sensor hole 17b, and the stopper 31 Is rotated about the pivot shaft 30 and is accommodated below the mounting surface in the stopper hole 17a.

The load deviation prevention device can also be configured as shown in FIG. 5, in which the stopper 31 ′ is formed in an L shape, and the center end is pivoted by the pivot shaft 30 ′. The end of the stopper 31 'on that side is projected as a sensor portion 31a' from the sensor hole 17b, and the L-shaped portion at the other end is inserted into the stopper hole 17a and lowered from the mounting surface by its own weight. When W is placed, the stopper 31 'rotates about the pivot shaft 30', the sensor portion 31a 'is housed in the sensor hole 17b, and the end of the stopper 31' projects from the stopper hole 17a. Similarly, it is configured to prevent load deviation. However, by arranging this load deviation preventing device not only in the left-right direction but also in the front-back direction, it is possible to prevent the load deviation between the front and rear when the stacker crane A travels on the traveling rail 14.

[0014]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. When a load is placed on the load-carrying part of the slide fork, the sensor part, which normally projects from the load-carrying surface, descends, and in conjunction with this, the stopper protrudes around the load to regulate the position of the load. It That is, it is possible to provide a load deviation prevention device with a very simple structure without requiring a dedicated power source, and it is possible to reliably prevent the deviation of the load when the slide fork slides. Also, when the load is removed from the load placement part, the sensor part protrudes and the stopper descends in conjunction with this, so the stopper does not interfere when sliding the slide fork without the load. In comparison with the conventional slide fork, it is not necessary to take a particularly large space for inserting the slide fork in a rack or the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a stacker crane.

FIG. 2 is an exploded perspective view of a slide fork.

FIG. 3 is a front sectional view of a top plate equipped with the load deviation prevention device of the present invention.

FIG. 4 is a front sectional view showing a state in which luggage is also placed.

FIG. 5 is a front sectional view showing another embodiment of the load deviation prevention device.

[Explanation of symbols]

 S Stacker crane 2 Slide fork 17 Top plate 17a Stopper hole 17b Sensor hole 31 Stopper 33 Sensor plate 34 Spring

Claims (1)

[Scope of utility model registration request] 1. A sensor part, which normally projects from a load carrying surface and is lowered when a load is placed, is provided on the load carrying surface of a slide fork, and the sensor part is interlocked with the sensor part to descend when the sensor part is projected. The slide fork load deviation preventing device is characterized in that a stopper protruding when the sensor part descends is provided around the load placing part.