JP3135199B2 - Stacker crane work lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work lifting device for a stacker crane, which can early detect the danger of a mounting table on which a work is placed falling or colliding due to an operation error or the like, thereby preventing damage to the stacker crane.

[0002]

2. Description of the Related Art A stacker crane is used to move a work in and out of shelves provided in multiple stages and multiple rows. For example, as shown in FIG. 6, a lifting device a in the stacker crane raises a pair of masts c1 and c2 on a traveling base b and a mounting table d guided by the masts c and c.
Are moved simultaneously by the drive of the reduction motor m, and the first connecting string e1 attached to one mast side and the second connecting string e2 attached to the other mast side are moved simultaneously.
Was formed so as to be able to move up and down. In addition, continuous string body e1, e
Reference numeral 2 denotes one end of which is wound around a rotating plate f for driving and extending from a mounting table d, and the other end is attached to the original mounting table d.

[0003]

The placing table d often damages the stacker crane, such as escaping due to an erroneous operation when descending during manual operation and colliding with the traveling base b, and the erroneous operation is detected early. Yes, mounting table d
There has been a strong demand for the appearance of a device capable of preventing the collision with the traveling base b. When the mounting table d is raised, the escape distance is more relaxed than when the mounting table d is lowered, so that the risk of damage is relatively small. As described above, measures to prevent the runaway when the mounting table d is lowered have been urgently required.

According to the present invention, a connecting member for connecting a continuous cord body and a mounting table is provided with a sliding member which can be moved in a vertical direction, and a downward displacement of the sliding member can be detected. It is an object of the present invention to provide a work lifting device of a stacker crane that can prevent the mounting table from escaping downward due to an operation error and prevent damage to the stacker crane.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a work elevating device for a stacker crane for moving a work in and out of shelves provided in a multi-stage, multi-row manner, wherein a rail provided along the shelves is moved. A traveling base is provided with a mast erected with a space for inserting a work therebetween, a mounting table guided up and down by the mast, and a driving rotating body that meshes with the first and second continuous strings. A deceleration motor to be driven and installed outside the mast is arranged, and both ends of the first string are connected to the mounting table on the one mast side via the upper and lower guides of one mast. By connecting the second link body to the mounting table on the other mast side via a connection fitting on the other mast side via the upper and lower guides of the other mast, the mounting table can be raised and lowered by rotation of the reduction motor And the connection brackets are A pair of guide pieces fixed to the base and extending up and down, and a slide tool guided vertically movably by the guide pieces and fixed to the continuous cord body; and A work lifting device for a stacker crane, comprising: a locking portion for preventing slipping out; and a detecting device for detecting a downward displacement of the sliding device.

[0006]

The sliding member fixed to the connecting cord body is prevented from coming out upward by a locking portion attached to the mounting table as shown in FIG. 5 (A). Therefore, in the mounting table, the continuous string body fixed to the sliding member is meshed with the driving rotating body, and the mounting table can be stopped and moved up and down without any trouble.

On the other hand, when the mounting table is lowered and the mounting table comes into contact with the traveling base or the like, as shown in FIG. On the other hand, the position shifts relatively downward. This displacement is detected by the detector, and the reduction motor can be stopped. Therefore, abnormal lowering due to an operation error of the mounting table can be prevented, and damage to the stacker crane can be prevented.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1-4, the stacker crane K has a multi-stage
This is an apparatus provided for moving workpieces W in and out of the shelves A provided in multiple rows, and is arranged on a traveling base 3 which runs on a rail 2 provided along the shelves A in the longitudinal direction of the rails. A pair of masts 4A and 4B are erected with a space G therebetween.

In this embodiment, a connecting member 21 is bridged between the tips of the two masts 4A and 4B,
Is formed as a frame that stands upright with the two masts 4A, 4B and the connecting member 21. This traveling base 3
Can run on the rail 2 and be stopped at an arbitrary position on the shelf A by the drive motor.

The space G between the two masts 4A, 4B
The mounting table 5 is arranged. The mounting table 5 includes rollers 22, 22 that can roll on the peripheral surface of the mast 4, and can be moved up and down along the masts 4 </ b> A, 4 </ b> B under the guidance of these rollers 22, 22. The mounting table 5 is provided with a fork 24 which can move toward and away from the shelf A. By mounting the work W on the fork 24, the work W is stored in the shelf A or the work W is moved from the shelf A. W can be taken out.

The work lifting device 1 of the stacker crane is a device for raising and lowering the mounting table 5, and the first and second two continuous strings 6 connected to the mounting table 5 via connection fittings 8. , 7, a driving rotator 9 for meshing the first and second string members 6, 7, and a reduction motor M for driving the driving rotator 9 are arranged on the traveling base 3.

In the present embodiment, the first and second continuous strings 6 and 7 are single-row or multi-row roller chains, in this embodiment, two-row roller chains. It is formed as an intermeshing sprocket wheel. Further, the reduction motor M is disposed at a position on the opposite side of the space G of the one mast 4A.

In FIG. 2, one end of the first string 6 is attached to a connection fitting 8 attached to the mounting table 5 near one mast 4A and one mast 4 on the reduction motor M side.
A meshes with the driving rotator 9A via an upper guide 11A comprising two pulleys 26 and 27 provided above A, and a tensioner 10A provided at the other end below the driving rotator 9A and The lower guide 11B, which is composed of a pulley 29 and is attached to the traveling base 3, is attached to the connection fitting 8 of the mounting table 5 through the lower guide 11B.

Similarly, one end of the second continuous cord body 7 is attached to a connection fitting 8 attached to the mounting table 5 near the other mast 4B, and is connected to two pulleys 31 and 32 provided on the connecting member 21. And meshes with the driving rotator 9B via the upper guide 12A. It should be noted that two driving rotating bodies 9A, 9B for driving the first and second continuous strings 6, 7, respectively.
Are engaged with the reduction motor M via a transmission mechanism such as a chain. In addition, the second link body 7 is moved forward through a lower guide body 12B including pulleys 33, 34, and 35 attached to the traveling base 3 and a tensioner 10B provided at the other end below the driving rotator 9B. It is attached to the mounting table 5 via the connection fitting 8.

Therefore, with the driving of the reduction motor M, the first and second two linked bodies 6, 7 can run at the same speed,
By the traveling, the mounting table 5 moves up and down between the masts 4A and 4B. Further, the first and second continuous cord bodies 6 and 7 are formed with a tension portion above the driving rotating body 9 and a slack portion below the driving rotator 9 when ascending and descending.

Each string 6, 7 generated in such a loose portion
The tensioner 10 is provided to remove the slack. In this example, the tensioner 10 has a first tensioner 10A for the first string 6 and a second tensioner 10B for the second string 7, which are arranged in substantially the same configuration, the same dimensions, and horizontally. Has been established.

The connecting fitting 8 is fixed to the mounting table 5 shown in FIGS. 3 and 4 and extends vertically with a gap B between the pair of guide pieces 14 and 14. And a slide 15 disposed in the gap B.

As shown in FIG. 4, the guide piece 14 has a protrusion 37 protruding toward the gap B extending over substantially the entire vertical direction.

The sliding member 15 is provided with an upper mounting piece 39 for fixing one end of the string 6 and (7) upward, and a string 6 (7) below.
The lower mounting piece 40 for fixing the other end of the first mounting piece is opposed to the lower mounting piece 39, and the upper and lower mounting pieces 39, 40 are connected by two joining pieces 41, 41. The string-like body 6 (or 7) is attached to each of the upper and lower attachment pieces 39 and 40 via a rod whose attachment length is adjustable.

The upper and lower mounting pieces 39 and 40 have grooves 4 to be fitted and guided by the protrusions 37 of the guide piece 14.
4 and 44 are provided respectively. Therefore, the slide 15 is
By the guidance by the guide pieces 14 on both sides, it is possible to move freely in the vertical direction and relatively to the mounting table 5.

The upper mounting piece 3 of the slide 15 is mounted on the mounting table 5.
9 is provided with a locking portion 16 composed of a pair of locking pieces 46, 46 whose lower surface can abut on the upper surface. Also, the mounting table 5 includes
A detecting member 17 formed of a limit switch that can be brought into contact with or separated from the sliding piece 15 by a vertical movement of the sliding piece 15 is provided on a protruding piece 47 that projects laterally from the joint piece 41 of the sliding piece 15.

However, when the mounting table 5 is lifted, the first and second link bodies 6 and 7 are driven together with the drive of the speed reduction motor M.
Travels through the upper guides 11A and 11B, and the
To rise. At the time of ascending, the sliding fitting 15 is used in the connecting fitting 8.
The mounting table 5 rises at the same speed as the first and second continuous cord bodies 6 and 7 because of contact with the locking portion 16.

When the mounting table 5 is lowered, the mounting table 5
Is engaged with the speed reduction motor M via the first and second string members 6 and 7, and the engaging portion 16 attached to the mounting table 5 is kept in contact with the sliding member 15. As a result, the mounting table 5 descends quietly in synchronization with the rotation of the reduction motor M together with the driving of the reduction motor M without falling. In this state, the projection 47 attached to the slide 15 is
Since it is located above as shown in FIG.
7 does not work.

Further, at the time of lowering, the mounting table 5 comes into contact with the traveling base 3 due to an operation error or the like, or the mounting table 3 is twisted between the masts 4A and 4B. When the descent stops, see FIG.
As shown in (B), the contact state between the sliding member 15 and the locking portion 16 is released, and the sliding member 15 is displaced relatively downward with respect to the mounting table 5. This displacement is detected by the detector 17, and the reduction motor M is stopped to prevent the stacker crane from being damaged.

In addition to forming the continuous string as a chain,
For example, it may be a belt body having a meshing portion like a toothed belt. As described above, the present invention can be modified into various aspects.

[0026]

As described above, the work lifting and lowering device for a stacker crane according to the present invention has a connecting member for connecting the continuous string body to the mounting table, and a sliding tool capable of fixing the continuous string body and capable of moving up and down. In addition, since the mounting table is provided with a locking portion for preventing the slipper from slipping out and a detector for detecting the downward displacement of the slide, a collision or drop due to an operation error or the like of the mounting table can be prevented early. Can prevent the damage of the stacker crane and improve safety.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a stacker crane in which a work lifting device according to the present invention is employed.

FIG. 2 is a front view showing one embodiment of the present invention.

FIG. 3 is an enlarged front view showing a main part of the mounting table.

FIG. 4 is a perspective view showing a connection fitting.

FIGS. 5A and 5B are front views showing the operation.

FIG. 6 is a plan view showing a conventional technique.

[Explanation of symbols]

 2 rail 3 traveling base 4A, 4B mast 5 mounting table 6 first linking body 7 second linking body 8 connecting bracket 9, 9A, 9B drive rotating body 11A, 11B guide body 12A, 12B guide body 14 guide Piece 15 Slipper 16 Locking part 17 Detecting part A Shelf G Space K Stacker crane M Reduction motor W Work

Continuation of the front page (56) References JP-A-63-66094 (JP, A) JP-A-2-144307 (JP, A) JP-A-63-218405 (JP, A) JP-A-6-33814 (JP) , U) Hikaru 4-75897 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65G 1/00-1/20 B66F 9/07

Claims (1)

(57) [Claims] 1. A work elevating device of a stacker crane for moving work in and out of shelves provided in a multi-stage, multi-row manner, comprising: a traveling base moving a rail provided along the shelves;
A mast erected with a space into which a work is inserted, a mounting table guided by the mast so as to be able to move up and down,
A drive motor for driving the second continuous body is driven and a reduction motor is installed outside the mast. Both ends of the first continuous body are connected to upper and lower guides of one mast. The connecting piece is connected to the mounting table on the one mast side via a connection fitting, and the second connecting body is provided on the mounting table on the other mast side via the upper and lower guides of the other mast. By connecting, the mounting table can be moved up and down by rotation of the reduction motor. The sliding table fixed to the cord body, and the mounting table is provided with a locking portion for preventing the sliding tool from slipping upward and a detecting tool for detecting a downward displacement of the sliding tool. Of stacker crane Click lifting device.