JP4855111B2 - Stacker crane - Google Patents

Description

The present invention relates to a stacker crane , and in particular, different ropes are fastened at two positions, ie, the front and rear ends of a lifting platform, and the two ropes are wound up and wound down by the same winding drum. The present invention relates to a stacker crane in which the structure and control are simplified and suspended and supported.

  Conventionally, although not particularly limited, for example, a stacker crane employed in a liquid crystal manufacturing factory or the like is a lifting platform on which a transported object such as a cassette is placed on a main mast established on a traveling carriage, and is moved up and down. Is suspended by a rope such as a wire rope.

  In addition, in stacker cranes where the load to be moved up and down is large, the lift platform is maintained in balance along the main mast, so that it can be lifted up and down while maintaining a parallel posture. The different ropes are fastened to support a heavy load with these ropes, and the base end of each rope is wound up by the winding drum of an independent hoisting device. ing.

By the way, when hoisting and lowering the rope with different hoisting drums of hoisting devices, two sets of hoisting devices D1 and D2 are required as shown in FIG. Since the balance weights BW and BW are attached to each of D1 and D2, the number of the ropes Wa, Wb, Wc, and Wd that suspend them is increased, and the structure for stretching the ropes becomes complicated. In order for the elevator 3 to move up and down while maintaining parallelism, it is necessary to completely synchronize the hoisting speed and the hoisting amount by the winding drums of the two sets of hoisting devices.
For this reason, there has been a problem that the control device for performing complete synchronization of the two sets of hoisting devices becomes complicated and the equipment cost becomes expensive.

In view of the problems of the conventional stacker crane , an object of the present invention is to provide a structure in which the front and rear of a lifting body are suspended and supported by a rope and a stacker crane in which the control is simplified.

In order to achieve the above object, the stacker crane according to the present invention suspends and supports the front and rear of the lifting platform that moves up and down along the main mast with different ropes, and the base ends of these ropes are wound in the same manner. It is a stacker crane that is wound and lowered by the winding drum of the upper device, and an accelerometer is arranged against the winding drum, and a tension measuring device and a personal computer are connected to the accelerometer. Features.

  In this case, the rope attached to the front end side of the lifting platform can be used as a secondary rope, and a tension balance adjusting mechanism can be attached thereto.

  Further, the tension balance adjusting mechanism can be a turnbuckle type.

According to the stacker crane of the present invention, the front and rear of the lifting platform that moves up and down along the main mast are suspended by different ropes, and the base ends of these ropes are wound by the same hoisting device. By winding and unwinding with a drum, the configuration of the lifting platform by the hoisting device becomes simple, the synchronous operation of the hoisting device is unnecessary, and the control can be easily performed.

And, by connecting a tension measuring device and a personal computer to an accelerometer arranged opposite to the take-up drum, the hoisting speed and the amount of hoisting by the take-up drum of the hoisting device are measured in real time and stable work can be performed. In addition, since the data can be recorded, even if an unexpected accident occurs, the cause of the accident can be traced.

  In addition, since the rope attached to the front end side of the lifting platform is a secondary rope, and the tension balance adjustment mechanism is attached to this, the main rope and the secondary rope are wound up and down by the winding drum of the same hoisting device. Even if an unbalance of tension occurs in the rope, it can be easily adjusted by the tension balance adjusting mechanism, so that the lifting operation can be performed stably.

  Moreover, the tension balance adjustment mechanism can be easily and quickly performed by using a turnbuckle type.

Hereinafter, an embodiment of a stacker crane of the present invention will be described based on the drawings.

1 to 3 show an embodiment of a stacker crane of the present invention.

For example, in a liquid crystal manufacturing factory or the like, as shown in FIG. 3, a plurality of thin glass sheets or the like are stacked and stored in a cassette K, and this stacker crane C is mounted along the transport line. Transfer and transfer the cassette K at each processing station position, transfer it to the next processing station position after performing each necessary processing, and transfer this cassette K, The transfer is performed by using a transfer machine 4 disposed on a lifting platform 3 that is guided by a main mast 2 established on a traveling carriage 1 and moves up and down.
In the illustrated embodiment, the main mast 2 and the sub-mast 21 are used as a two-mast type. However, only one main mast can be used, and as shown in FIG. It can be replaced with other transported items.

By the way, the elevator 3 of the stacker crane C is often subjected to a large load that exceeds a preset allowable load due to vibrations and mounting loads. It is suspended and supported by ropes W1 and W2 such as two different wire ropes at the ends so as to rise and fall smoothly along the main mast M.
And one of these two ropes W1, W2, specifically, the rope fastened to the rear end of the base end side of the lifting platform 3 is the main rope W1, on the other hand, specifically, The rope to be fastened to the tip side of the lifting platform 3 is defined as a secondary rope W2.

  As shown in FIG. 1, the base ends of the main rope W1 and the sub rope W2 are both wound around the winding drum 51 of the same hoisting device 5, but the main rope W1 includes Further, the balance weight cord W3 is provided, and the balance weight 6 is fastened and suspended at the end. The main rope W1, the secondary rope W2, and the balance weight rope W3 include one or a plurality of sheaves S1, S2, S3 between the winding drum 51, the lifting platform 3, and the balance weight 6. So that each rope can be guided safely.

  Further, the secondary rope W2 to be fastened to the tip side of the lifting platform 3 is provided with a plurality of sheaves S2 between the winding drum 51 and the lifting platform 3 in the same manner as the primary rope W1. The tension balance adjusting mechanism 7 is preferably provided on a part of the sub-wire W2, preferably on the tip side of the sub-wire W2, although not particularly limited, for example, as shown in FIG. In this way, a turnbuckle is arranged so that the tension balance with the main rope W1 can be adjusted.

  The position facing the take-up drum 51 is not particularly limited. For example, the accelerometer 8 is disposed at a position about 1 m away from the take-up drum 51, and a tension measuring device is attached to the accelerometer 8. 9 and a personal computer 10 connected to the tension measuring device 9 to measure the tension of the ropes such as the main rope W1 and the auxiliary rope W2, and record the measured values.

Next, the operation of this stacker crane will be described.
When the elevator 3 is stopped at a predetermined position, the cassette K of the conveyed product is placed on this or on the transfer machine 4 of the elevator 3 and raised to a predetermined height. This is because the winding drum 51 of the hoisting device 5 is driven to rotate so that the main rope W1 and the secondary rope W2 are simultaneously wound on the winding drum 51, and further the balance weight rope W3 is simultaneously wound. The lift 3 is lifted up.
On the other hand, when the lifting platform 3 is lowered, the winding drum 51 is rotated in the reverse direction to rewind each rope.

  When the main rope W1, the secondary rope W2, and the balance weight rope W3 are wound, they are wound or unwound by the same winding drum 51, and therefore, between the main rope W1 and the sub rope W2. However, it is not necessary to synchronize with the conventional system using two units of the winding drum 51.

  At this time, the accelerometer 8 is disposed so as to face the winding drum 51, and the tension measuring device 9 is connected to the accelerometer 8. Therefore, the main rope W <b> 1 and the sub rope by the winding drum 51 are connected to the accelerometer 8. The hoisting speed and the hoisting amount of the strip W2 can be measured in real time, and the data can be recorded and stored in the personal computer 10. Thereby, the raising / lowering speed and the raising / lowering amount of the raising / lowering stand 3 can be detected, and the stable raising / lowering operation and raising / lowering to the exact position can be performed.

  Further, when the tension balance is lost due to the extension of the main rope W1 and the auxiliary rope W2 due to use, the tension balance adjusting mechanism 7 disposed on the auxiliary rope W2 side can adjust the tension balance. In this case, by adopting a turnbuckle for the tension balance adjusting mechanism 7, as shown in FIG. 2, the turnbuckle body is rotated between the screw rods 71 and 72, thereby adjusting the interval L and adjusting the main rope W1. The tension balance is adjusted, but this adjustment can be performed quickly and easily.

Therefore, the stacker crane of the present invention uses a single unit hoisting device 5 and, when an unbalance occurs in the tension in the main rope W1 and the secondary rope W2, a tension balance adjusting mechanism 7 such as a turnbuckle. By adjusting in (4), it is possible to always perform the lifting operation stably and the structure and the control circuit are simplified, so that there is an advantage that it can be provided at low cost.

The stacker crane of the present invention has been described above based on the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations may be changed as appropriate without departing from the spirit of the present invention. It is something that can be done.

The stacker crane according to the present invention has a simple rope structure and control by fastening different ropes at two positions, the front and rear ends of the lifting platform, and winding and lowering the two ropes with the same drum. Therefore, it can be suitably used for an elevator platform of a stacker crane .

It is a schematic explanatory drawing which shows one Example of the stacker crane of this invention. It is explanatory drawing of a tension balance adjustment mechanism. It is explanatory drawing of the raising / lowering stand of the stacker crane of this invention. It is a schematic explanatory drawing of the conventional stacker crane .

C Stacker crane W1 Main rope W2 Sub rope W3 Balance weight rope 1 Traveling carriage 2 Main mast 3 Lifting platform 4 Transfer machine 5 Lifting device 51 Winding drum 6 Balance weight 7 Tension balance adjustment mechanism 8 Accelerometer 9 Tension measuring device 10 Personal computer S1, S2, S3 Sheave

Claims (3)

The front and rear of the platform, which is raised and lowered along the main mast, are suspended and supported by different ropes, and the base ends of these ropes are wound and wound by the winding drum of the same hoisting device. a stacker crane that is, the stacker crane with disposing the accelerometers to face the winding drum, characterized in that connected the tension measuring device and the personal computer to the accelerometer. 2. The stacker crane according to claim 1, wherein the rope attached to the front end side of the lifting platform is a secondary rope, and a tension balance adjusting mechanism is attached thereto. The stacker crane according to claim 1 or 2, wherein the tension balance adjusting mechanism is a turnbuckle type.

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