JP2001031209A - Pallet giving/receiving device for hand lift truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly deliver a pallet by providing a pair of lifting devices arranged outside a residual edge part of a pallet placing surface and a carriage capable of freely advancing/retreating to the pallet placing surface from a carriage gateway in a pallet giving/receiving device for a hand lift truck. SOLUTION: A driving conveyor 21 is installed in an incoming/delivering station arranged on the side of a rack device, and a pallet giving/receiving device 31 is arranged in the rear of this driving conveyor 21. The pallet giving/ receiving device 31 has a pallet placing surface 33 corresponding to a shape of a pallet P, a hand lift truck gateway 34 is arranged in a rear edge upper part of this pallet placing surface 33, and a carriage gateway 35 is arranged in an edge upper part of the pallet placing surface 33 opposed to the hand lift truck gateway 34. A pair of lifting devices 36 for lifting the pallet P are arranged outside a residual edge part of the pallet placing surface 33 to give/ receive the pallet P of the pallet placing surface 33 together with a freely advancing/retreating carriage 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet transfer device for a hand lift truck.

[0002]

2. Description of the Related Art As an article carrier called a hand lift truck, a vehicle body having a pair of fork-like carriers, an arm provided on the lower surface of the tip of the fork-like carrier so as to be able to swing up and down, and a rotatable arm. The front wheel provided, the rear wheel unit provided at the rear of the vehicle body via a hydraulic lifting device, and the arm swinging so as to raise and lower the front wheel in conjunction with the vertical movement of the rear wheel unit by the hydraulic lifting device. An apparatus having an interlocking mechanism for moving is known. The hand lift truck is used as follows. The fork-shaped carrier is inserted into the fork insertion space of the pallet, and the front wheel is brought into contact with the ground through an opening formed in the lower wall of the pallet. Of course, the rear wheel is in contact with the ground. Thereafter, the fork-like carrier is raised with respect to the front wheels and the rear wheels, and the pallet is lifted from the ground by the fork-like carriers. Thereafter, the hand lift truck on which the pallet is placed is moved to a predetermined position. Thereafter, the pallet is lowered to the ground by the reverse operation, and the fork-shaped carrier is removed from the fork insertion space of the pallet. In addition,
The lifting stroke of the fork-shaped bed is set to the height required for lifting the pallet, and is extremely short unlike that of the fork of the forklift.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pallet transfer device for a hand lift truck for sending a pallet on the hand lift truck to a desired device or receiving a pallet from a predetermined device. It is in.

[0004]

Means for Achieving the Object The present invention employs the following means to achieve the object. According to the first aspect of the present invention, there is provided a pallet placing surface having a rectangular shape in a plane, a hand lift truck entrance provided above one edge of the pallet placing surface, and a pallet placing surface facing the hand lift truck entrance. A trolley door provided above the edge, a pair of lifting devices for lifting a pallet provided outside the remaining edge of the pallet mounting surface, and a pallet mounting surface capable of moving back and forth from the trolley door. And a trolley made. The invention according to claim 2 is the one according to claim 1, wherein the carriage is guided by a guide rail, and the guide rail is movable back and forth with respect to the pallet mounting surface. The invention according to claim 3 is the invention according to claim 2, wherein the guide rail is moved forward and backward by being dragged by a bogie.

[0005]

According to the present invention, the following effects can be obtained by the above configuration. According to the invention of claim 1, pallets are exchanged between the hand lift truck and the bogie, and the pallets can be smoothly transferred from the hand lift truck to the subsequent device via the bogie and the pallets can be transferred to the bogie. From the following device, it can be passed smoothly to the hand lift truck via the bogie. According to the second aspect of the present invention, the carriage can be reliably moved by the guide action of the guide rail without meandering. In addition, since the guide rail can be retracted from the pallet mounting surface, there is no obstacle to the hand lift truck entering the pallet mounting surface. According to the third aspect of the present invention, since a device for moving the guide rail forward and backward is not required, the pallet transfer device can have a simple structure.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In this description, the front means the lower side of FIG. 1, the rear means the upper side of the figure, the left means the left side of FIG. 1, and the right means the right side of the figure.

[0007] 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 1 includes a plurality of front columns 2 arranged side by side at predetermined intervals, a rear column 2 arranged behind the front columns 2 with a predetermined interval therebetween, and front and rear columns 2. And a large number of article support members 4 provided at predetermined intervals in the height direction.
Is configured. A space between the pair of left and right article support members 4 is a fork passage gap 5 that allows the slide fork 17 to be described later to move vertically. The entrances 6 of the article storage shelves 3 of the front and rear rack devices 1 face each other.

A pair of upper and lower guide rails 11 are arranged in the stacker crane passage 10 so that the longitudinal direction thereof is directed to the left and right, and the stacker crane 13 is guided by these guide rails 11 so as to be movable left and right. , This stacker crane 13
A lift 16 which can be moved up and down on a mast 15 provided on the traveling vehicle 14, and a slide fork 17 which can be horizontally slidably moved in the front-rear direction by a known reciprocating mechanism on the lift 16. are doing. As is well known, the slide fork 17 performs an operation of projecting the pallet P downward and raising the pallet 16 to lift the pallet P and retreating to the pallet 16 to draw the pallet P into the pallet 16. The pallet P can be put down on the article storage shelf 3 or the like by the operation reverse to the above.

Two loading / unloading stations 20 are provided on the left side of the rear rack device 1. Each of the loading / unloading stations 20 is provided with a drive conveyor 21 such as a chain conveyor, for example, which can turn the transport direction in the front-rear direction and change the transport direction forward and backward. A fork passage gap 22 is formed on the side of the drive conveyor 21 facing the stacker crane passage 10 so that the slide fork 17 can move in the vertical direction near the transfer surface of the drive conveyor 21.

The front and rear rack devices 1 and the drive conveyor 21
Is stored in a building 25 indicated by a two-dot chain line.
The entrance 24 is located at the rear end of the drive conveyor 21, and the entrance 24 can be opened and closed by a shutter (not shown).

A pallet transfer device 3 for a hand lift truck is provided behind the drive conveyor 21 (upward in FIG. 1).
1 is provided. The pallet transfer device 31 includes a rectangular pallet mounting surface 33 corresponding to or larger than the shape of the pallet P, and one of the pallet mounting surfaces 33.
Hand lift truck doorway 3 provided above one edge, in this embodiment a rear edge (the upper edge in FIG. 1)
4 and a trolley entrance 3 provided above the edge of the pallet mounting surface 33 facing the hand lift truck entrance 34
5 and a pair of lifting devices 36 for lifting the pallet P provided outside the remaining edge of the pallet placing surface 33.
And a trolley 37 which can move forward and backward with respect to the pallet mounting surface 33 from the trolley entrance 35.

The lifting device 36 includes a base frame 40 having a rectangular side shape, and a guide rail 41 provided on the front and rear portions of the base frame 40 so that the longitudinal direction thereof is directed vertically.
An elevating member 42 which is guided by the guide rails 41 so as to be able to move up and down, an actuating device 43 which operates the elevating member 42, and is provided on the elevating member 42 so as to be horizontally swingable, and the right and left sides of the pallet P Recess formed in (not shown)
It has a pair of front and rear rocking pieces 44 that can be located at a position where the movable member enters the housing and a retracted position overlapping the lifting member 42 when viewed from a plane. The rocking piece 44 enters a recess (not shown) formed on the left and right sides of the pallet P in the state shown by the dashed line in FIG.

The actuating device 43 is rotatably provided on the base frame 40 with its axis centered in the vertical direction, and a pair of screw rods 46 screwed into screw holes formed in the elevating member 42; It has a forward / reverse rotatable motor 47 for rotating one of the rods 46 and an interlocking mechanism 48 for rotating the front and rear screw rods 46 in synchronization.

The lift member 42 has a recess 50 into which the swinging piece 44 fits. The swinging piece 44 is operated by a forward / reverse rotatable motor 51 mounted on the elevating member 42.

A fixed rail 54 whose longitudinal direction is oriented in the front-rear direction is provided on the ground below the carriage 37, and a guide rail 55 is provided along the fixed rail 54 so as to be movable back and forth. The bogie 37 is rotatably provided on the side of the carriage 37 so that the axis is oriented vertically, and four wheels 56 in total, right, left, front and rear are brought into contact with each other. A pair of protrusions 58a, 58b are provided on the upper part of the guide rail 55.
Are provided on the carriage 37. The protrusions 59a and 59b that engage with these protrusions 58a and 58b are provided.

With this configuration, when the carriage 37 moves so as to protrude from the pallet mounting surface 33, the guide rail 55 is dragged by the carriage 37 after projecting a predetermined distance and the projection 59a abutting against the projection 58a. The carriage 37 protrudes from the pallet mounting surface 33 in the form of being guided, and is guided by the guide rail 55 so that the bogie 37 smoothly protrudes from the pallet mounting surface 33 without meandering or the like. The protruding length of the carriage 37 is "L" as shown in FIG. On the other hand, when the carriage 37 moves so as to retreat from the pallet mounting surface 33, the guide rail 55 is dragged by the carriage 37 after retreating a predetermined distance and the projection 59b abuts on the projection 58b. The carriage 37 retreats from the mounting surface 33 and is guided by the guide rail 55, and smoothly retreats from the pallet mounting surface 33 without meandering. When the carriage 37 retreats from the pallet mounting surface 33, the guide rail 55 also retreats from the pallet mounting surface 33.

The carriage 37 is provided with a drive conveyor 57 such as a chain conveyor or the like, which is capable of turning the transport direction in the front-rear direction and changing the transport direction forward and backward.

[0018]

Next, the operation of the embodiment of the present invention will be described. The pallet P (on which articles (not shown) are placed) is conveyed to the pallet placing surface 33 by the hand lift truck 60. At that position, the hand lift truck 60 unloads the pallet P from the pallet P. In this state, the left and right recesses (not shown) of the pallet P face the swinging pieces 44 waiting at the lowermost position. Thereafter, the swinging pieces 44 waiting at the lowermost position protrude into the left and right recesses (not shown) of the pallet P. Thereafter, the lifting member 42 moves up, so that the swinging piece 44
As a result, the pallet P is lifted upward. afterwards,
When the lower surface of the pallet P is located above the transport surface of the drive conveyor 57 of the carriage 37, the lifting member 42 stops. Thereafter, the bogie 37 waiting in the illustrated state protrudes from the pallet mounting surface 33 and enters the lower surface of the pallet P. Thereafter, the elevating member 42 descends and lowers the pallet P on the drive conveyor 57, and the elevating member 42 stops at a position where the swinging piece 44 does not contact the pallet P. Thereafter, when the swinging piece 44 retracts, the elevating member 42 descends to the lowermost position. The carriage 37 comes out of the pallet placing surface 33 and moves to a position close to the drive conveyor 21. Thereafter, the driving conveyor 57 and the driving conveyor 21 are driven, and the pallet P is carried to the front end of the driving conveyor 21. Thereafter, the pallets P are stored in the predetermined article storage shelves 3 by the stacker crane 13. The pallet P is placed on the hand lift truck 60 by the reverse operation.

[0019]

[Modifications and the like] Modifications and the like will be described below. (1) The guide rail 55 may be operated by an operating device such as a hydraulic cylinder. (2) A fork passage gap is formed at the front end of the drive conveyor 57 so that the slide fork 17 can move up and down in the vicinity of the transport surface. Therefore, the drive conveyor 21 is eliminated, and the drive conveyor 57 (trolley 37) that has escaped from the pallet mounting surface 33 is positioned at the loading / unloading station 20, so that the slide fork 1
The pallet P may be exchanged between the pallet 7 and the driving conveyor 57. (3) The carriage 37 may be provided with a lifting platform or the like in relation to the subsequent device.

[Brief description of the drawings]

FIG. 1 is a simplified horizontal cross-sectional view showing an embodiment of the present invention, with an intermediate portion omitted.

FIG. 2 is an enlarged view of part A of FIG.

FIG. 3 is a partially cutaway view taken along line III-III in FIG. 2;

[Explanation of symbols]

 31 Pallet transfer device 33 Pallet mounting surface 34 Hand lift truck entrance 35 Bogie entrance 36 Lifting device 37 Bogie

Claims (3)

[Claims] 1. A flat rectangular pallet placing surface, a hand lift truck entrance provided above one edge of the pallet placing surface, and an edge of the pallet placing surface facing the hand lift truck entrance. , A pair of lifting devices for lifting the pallet provided outside the remaining edge of the pallet mounting surface, and a pallet mounting surface that can be advanced and retracted from the trolley entrance. A pallet transfer device for a hand lift truck having a trolley. 2. The pallet transfer device for a hand lift truck according to claim 1, wherein said carriage is guided by a guide rail, and said guide rail is movable back and forth with respect to a pallet mounting surface. 3. The pallet transfer device for a hand lift truck according to claim 2, wherein the guide rail is moved forward and backward by being dragged by a bogie.