JPS6055435B2 - Fall prevention device for elevating objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing the fall of an elevating object, and particularly to a technique for preventing the fall of an elevating object with a driver's cab of a stacker crane for shelving.

A stacker crane with a driver's cab attached to an elevating body has the following problems: When the hoisting rope that supports the elevating body breaks,
A safety device must be installed to automatically prevent the free fall of elevating objects, including the operator's cab.

This type of conventional safety device is attached to the main body of the stacker crane, and includes a guide rail that guides the lifting body up and down,
When the rope is cut between the wedges attached to the elevating body that moves up and down along this guide rail, the rollers attached to the elevating body are bitten by the spring force, and the friction force generated at that time is used to move the elevating body. Free fall was stopped.

This type of safety device can be used relatively without problems if the weight of the lifting object is small, but as the weight of the lifting object increases, the rollers and guide rails sandwiched between them may become deformed, causing frictional force. decreases.

Furthermore, in the case where a spring force applies a biting force to a roller attached to the elevating body side, the biting friction force is insufficient by the spring force alone, and the roller slides on the guide rail surface. Therefore, the elevating body falls together with the rollers. For this reason,
There is a disadvantage in that it is not possible to safely and reliably prevent the free fall of a heavy lifting body, which creates a danger. In addition, Japanese Patent Application Laid-open No. 52-1092 (9) discloses a device in which when a wire lobe is cut, a tilting equalizer beam drives a pin into a pin insertion hole provided in a frame to prevent the wire lobe from falling. Disclosed. However, with this device, it is impossible to drive a pin into a portion other than the pin insertion hole, and there still remains a problem in terms of reliability. SUMMARY OF THE INVENTION An object of the present invention is to provide a fall prevention device for an elevating object that can safely and reliably stop the elevating object when cutting a hoisting lobe.

Hereinafter, the present invention will be explained in detail based on an embodiment of the present invention shown in FIGS. 1 to 3.

The stacker crane adopted in the present invention is as shown in Fig. 1.
Main body 1 is constructed by connecting the upper frame and lower frame with vertical supports.
The main body 1 is equipped with a traveling device 6 and a hoisting device 5, and a hoisting lobe 10 emitted from a hoisting drum 3 driven by the hoisting device 5 lifts the elevating body 2 from the upper frame. A driver's cab 8 integrally attached to this elevating body 2 is suspended.

This stacker crane is moved horizontally by a traveling device 6,
By operating the lobe 10 by the hoisting drum 3, the elevating body 2 and the driver's cab 8 can be moved up and down. At this time, the elevating body 2 is attached to the support of the main body 1. Girder guide rail 13
The copper body 12 is lifted up and down along the vertical axis, and loaded with a telescopic fork 7 installed on the elevating body 2 onto a rack in the warehouse, or scooped up from the rack and transferred to the outside of the rack. In order to prevent the free fall of the elevating body 2 and the driver's cab 8, fall prevention devices 20 are arranged at both ends of the elevating body 2.

A fall prevention rope 9 with one end attached to the upper frame of the main body 1 is attached to this fall prevention device 20 via a rope sheep 23 as shown in FIG. The other end of the lobe 9 for prevention passes through the vicinity of the upper frame portion of the main body 1 and is wound around the lobe winding drum 4 for preventing fall.

This lobe winding drum 4 rotates in synchronization with the hoisting drum 3 by meshing a gear 14 that rotates integrally with the lobe winding drum 4 and a gear 15 that rotates integrally with the hoisting drum 3. Perform step 9. This gear ratio is based on the rope sheep 23 suspended by lobes 9 for fall prevention.
The speed at which the lift body 2 moves up and down in response to the operation of the fall prevention lobe 9 is set to be the same as the speed at which the lift body 2 moves up and down.
This setting is performed by taking into consideration the lobe paths of the hoisting lobe 10 and fall prevention lobe 9, the difference in the drum l/diameter between the hoisting drum 3 and the lobe winding drum 4, etc. In this embodiment, the raising and lowering speeds are matched by the gear ratio, but in the case where a separate drive device is provided for the lobe winding drum 4, the raising and lowering speeds are matched using electrical control. As shown in FIG. 3, a first lever 26 in a horizontal position is attached to the shaft of the rope sheep 23 suspended by the fall prevention lobes 9 having the above-mentioned lobe path through a bracket, as shown in FIG.

One end of the first lever 26 is attached to the elevating body 2 with a pin at a location away from the guide rail 13 to the left so that it can swing vertically, and the other end is attached to the upper end of the second lever 25 which is vertical. It is attached with a pin so that it can swing freely from side to side. The center of a horizontal third lever 24 is attached to the lower end of the second lever 25 with a pin so that it can swing vertically. A horizontally long elongated hole is formed at both ends of the third lever 24, and a pin is passed through the elongated hole so as to be able to swing freely in the horizontal direction. Attach the wedges 22a and 22b. The second wedges 22a and 22b have a surface facing the guide rail 13 that is parallel to the guide rail 13, and a surface that is opposite to the guide rail 13 and has an inclined surface that separates from the guide rail 13 as it goes downward. ing. On the other hand, the fall prevention device 20 includes first wedges 21a, 21b other than the second wedges 22a, 22b.

The first wedges 21a, 21b are connected to the second wedge 22
It has an inclined surface of the same degree as the wedges a and 22b, and is attached to the elevating body 2 in such a manner that the inclined surface of the second wedges 22a and 22b and the inclined surface of the first wedge are parallel to each other.
This mounting position is such that the slopes of the first and second wedges are mutually aligned! The first wedges 21a, 21 are formed so as to face each other.
The distance between the upper end of the guide rail 13 and the guide rail 13 is adjusted so that the second wedges 22a and 22b cannot pass through. In this embodiment, in order to raise and lower the elevating body 2, J rotates the hoisting drum 4 using the hoisting device 5, and unwinds the lobe 10 for hoisting from the hoisting drum 4, and This is done by winding up the hoisting robe 10.

At this time, the lobe winding drum 4 for fall prevention is also connected to each gear 1.
4 and 15, the lobe 9 for fall prevention is paid out from the lobe winding drum 4 in the same direction as the lobe 10, or the lobe 9 is wound around the lobe winding drum 4. For this reason, rope sheep 23
The second wedges 22a, 22b suspended from the lobe 9 via the levers 24, 25, etc. move up and down simultaneously with the elevating body 2 in the same direction. At this time, the rotational speed of the lobe winding drum 4 is adjusted by the gear ratio of each gear 14, 15 so that the ascending and descending speed of the rope sheep 23 is the same as the ascending and descending speed of the ascending and descending body. The first wedges 21a, 21b attached to the lobes 9 and the second wedges suspended indirectly from the lobes 9
The wedges 22a and 22b move up and down without changing their positions relative to each other. For this purpose a second wedge 22a
, 22b are suspended between the guide rail 13 and the first wedge 21a or 21b with a gap maintained between the guide rail 13 and the first wedge 21a or 21b. Therefore, the lifting body 2 can be moved smoothly at all times.
can be moved up and down. When the elevating body 2 is raised and lowered,
Even if the lobe 9 and the rope sheep 23 swing left and right and try to contact the guide rail 13 etc., the lobe 9 and the rope sheep 29 are supported by the elevating body 2 via the first lever 26 and restrained from large swings in the left and right direction. This prevents contact accidents from occurring.

Furthermore, the robe 9 and rope sheep 23 are attached to each lever 24, 2.
Since the second wedges 22a and 22b can be suspended in the air on the sides of the guide rail 13 while being installed at positions offset from the guide rail 13 via the wedges 5 and 26, they cannot be raised or lowered even if the fall prevention device 20 is installed. body 2 on guide rail 13
There is an advantage that it can be placed as close as possible to the side, that is, to the pillar side of the main body 1. Next, when the hoisting lobe 10 supporting the elevating body 2 breaks, the elevating body 2 freely falls along the guide rail 13.

When this free fall occurs, the fall prevention device 20 operates as follows to stop the free fall of the elevating body 2. That is, the elevating body 2
When a free fall occurs, the first lever 26 is suspended by the lobe 9 via the rope sheep 23 etc.
Each lever 24 swings upward around the connection point with the elevating body 2.
, 25 as well as the second wedges 22a, 22b.

Also, as the elevating body 2 falls, the first wedge 21a
, 21b are also lowered, so the second wedge 22a22b is lowered by the elevating body 2 relative to the first wedges 21a, 21b.
It rises with an inertial mass equivalent to the weight of . Due to these upward movements, the first wedges 21a, 21b descend while pushing the inclined surfaces of the second wedges 22a, 22b toward the guide rail 13, and as a result, the elongated hole of the third lever 24 and this elongated hole the second wedge 22a, 2 by means of a sliding pin;
2b is pushed toward the guide rail 13 and moves. Due to this movement, the second wedges 22a, 22b are in surface contact with the guide rail 13 and the first wedges 21a, 21b, and the elevating body 2 falls between the guide rail 13 and the first wedges 21a, 21b. It bites in with a large piece of wood equivalent to its mass.
The large frictional force at this time reliably stops the free fall of the elevating body 2. In this way, by obtaining frictional force due to surface contact between the wedge surfaces of the first and second wedges 21a, 21b, 22a, and 22b, deformation of the guide rail 13 surface and the biting member is prevented, and furthermore, the lobe 9 is By suspending the second seven wedges 22a, 22b, which are the biting members, from the main body 1, the second wedges 22a,
Even if there is a burr caused by insufficient frictional force between the second wedge 22b and the guide rail 13, the second wedge 22a, 2
2b continues to be suspended in that position without slipping, and this flap prevents the lifting body 2 from sliding down, so that the lifting body 2 can be restrained more reliably. In this stopping operation, each second wedge 22a,
If one of the two 22b bites in first, the other may not bite, or even if it does bite, it may be insufficient. However, in this embodiment, the third lever 24 is made vertically swingable by a pin, and the third lever 24 is pivoted vertically.
The movement of the lever 24 automatically brings the other second wedge to the position where it can be bitten, so that the second wedges 22a and 22b are made to bite securely, and the elevating body 2 is reliably stopped. do. Furthermore, according to the configuration of this embodiment,
When performing an operation confirmation test of the fall prevention device 20, the confirmation test can be easily and safely carried out by simply fixing the fall prevention lobe 9 and loosening the hoisting lobe 10, and is not very troublesome.

As described above, according to the fall prevention device of the present invention, the biting member suspended so as not to slip is bitten by the large biting force generated by the falling weight of the elevating body, and the frictional force for preventing the fall is generated. Because of this, it is possible to reliably prevent the lifting object from falling, and since the wide contact surface with the guide rail is used to prevent the lifting object from falling, a good friction surface condition is achieved without causing deformation of the guide rail etc. To more reliably prevent an elevating object from falling through stable frictional force.

In particular, when the object is an elevating object with a driver's cab, the safety of the driver can be taken into consideration, so the present invention is also effective when applied to this type of elevating object.

[Brief explanation of drawings]

Fig. 1 is an overall view of a stacker crane that employs an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the lobe path to the fall prevention device in Fig. 1, and Fig. 3 is an illustration of the fall prevention device in Fig. 1. FIG. 3 is an enlarged view of the device. 1...The main body of the stacker crane, 2...
・Elevating body, 3...Hoisting drum, 4...
Lobe winding drum, 8... Driver's cab, 9...
...Lobe for fall prevention, 10...Lobe for hoisting, 13...Guide rail, 14,15
...Gear, 20...Fall prevention device, 2
1a, 21b...First wedge, 22a, 22
b...Second wedge, 23...Lobe, 24...Third lever 25...Second lever, 26...Third lever 1 lever.

Claims (1)

[Claims] 1. In a stacker crane that is equipped with an elevating body that moves up and down along a guide rail provided on the support and a hoisting drum that moves the elevating body up and down by winding a hoisting rope, the gap between the upper parts becomes narrower. A first wedge consisting of a pair of wedge pieces attached to the elevating body and disposed between the pair of wedge pieces, and sliding upward with the wedge pieces,
A second wedge consisting of a pair of wedge pieces that presses both sides of the guide rail, and has elongated holes in the length direction at both ends thereof, and the second wedge is slidable in the elongated holes. A third lever is attached and is normally held substantially horizontally, a second lever is attached such that its lower end is rotatable with respect to the center of the third lever, and one end thereof is pivoted with the upper end of the second lever. a first lever that is movably coupled and whose other end is swingably attached to the elevating body; a fall prevention rope that suspends a central portion of the first lever; A rope winding drum for winding is provided, and speed regulating means for regulating the rotational speed of the rope winding drum so that the ascending and descending speed of the hoisting rope and the ascending and descending speed of the fall prevention rope match. A fall prevention device for an elevating object, characterized by: