JPS5815439B2 - Fall prevention device for lifting objects with fragments - 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 in which the operator's cab is attached to an elevating object must be equipped with a safety device that automatically stops the elevating object, including the operator's cab, from freely falling when the hoisting rope supporting the elevating object breaks. .

Conventionally, this type of 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, a roller attached to the elevating body is bitten by a spring force between the wedges attached to the elevating body, and the frictional force generated at that time is used to prevent the free fall of the elevating body.

In a safety device using this type of method, when the fall prevention is activated, the roller, which is the biting member, is connected and supported only to the falling elevating body, so the frictional force generated between the roller and the guide rail is If this occurs due to deformation of the rollers or the guide rail surface, the rollers will slide on the guide rail surface, causing the disadvantage that the rollers will move up and down and fall as one with the rollers.

This drawback is noticeable because as the weight and handling load of the elevating object increases, the rollers and guide rail surfaces are more likely to be deformed due to the impact force at the time of biting. The biting power is insufficient.

To overcome this problem, the rollers can be suspended from the main body of the stacker frame by ropes, and the sliding rollers can be supported from the ice body side via the ropes to prevent the rollers from sliding down and to stop the lifting body from falling. .

In this case, it is necessary to raise and lower the elevating body and the roller at the same speed at all times to prevent the roller from getting wedged between the guide rail and the wedge attached to the elevating body unless the falling prevention technique is used.

However, if the rope that suspends the roller swings due to the movement of a stacker crane, the vertical movement of an elevating object, or other external force, the light roller will move up and down even outside the fall prevention device. The disadvantage is that it is easy to perform a traversing operation.

This drawback also occurs when the raising and lowering speeds of the roller and the lifting body cannot be made exactly the same.

An object of the present invention is to eliminate the decrease in reliability of a safety device due to insufficient frictional force or unexpected operation of biting action; The aim is to reliably prevent the elevating body from falling.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The sufutsuka claim adopting the present invention is as shown in Figure 1.
It has a main body 1 in which an upper frame and a lower frame are connected by a support.

This main body 1 is supported by a traveling device 6 so as to be freely movable.

Furthermore, the main body 1 is equipped with a hoisting device 5, and a hoisting rope 1 is emitted from a hoisting drum 3 driven by this hoisting device 5.
0 suspends the elevating body 2 and the driver's cab 8 integrally attached to the elevating body 2 from the upper frame.

The driver's cab 8 and the elevating body 2 are moved up and down along guide rails 13 attached to the pillars in response to rope operation from the hoisting drum 3.

By the above-mentioned traveling movement and vertical movement, the telescopic fork 7 installed on the elevating body 2 is directed to a three-dimensional shelf at a desired position, and the load such as the steel material 12 on the telescopic fork 7 is scooped onto this three-dimensional shelf. Cargo handling work, etc.

A fall prevention device 20 is installed between both sides of the elevating body 2 and the support of the main body 1.

As shown in FIG. 3, this fall prevention device 20 has a first wedge 21a.

21b is attached to the elevating body 2 so as to sandwich the guide rail 13 with a gap.

The orientation of this attachment is adjusted so that the inclined surfaces of the first wedges 21a, 21b face the guide rail 13 and are positioned under the floor.

Second wedges 22a, 22b are arranged in the gaps between the first wedges 21a, 21b and the guide rail 13.

This second wedge has a surface facing the guide rail 13 parallel to the guide rail 13 surface, and the first wedge 2
1a.

The surface facing the wedge 21b is parallel to the inclined surface of the first wedges 21a and 21b.

The second wedges 22a, 22b are connected to pins that are slidably passed through horizontal elongated holes formed at both ends of the third lever 24.

The middle portion of the third lever 24 is attached to the lower end of the second lever 25 in a vertical position by a pin so as to be swingable in the vertical direction.

This second lever 25. The upper end is attached to one end of the louver 26 with a pin so that it can swing left and right.

The other end of the lever 26 is pin-coupled to the elevating body 2 at a location laterally separated from the guide rail 13 so as to be vertically rotatable.

The lower surface of this louver 26 and the elevating body 2 are
Shear pin 27 in a position that restricts the vertical movement of the
connected by.

The cutting load of the shear pin 27 is set to such a size that the impact force received by the shear pin 27 when the elevating body 2 falls will cause the shear pin 27 to cut from the central notch.

A rope sheep 23 is attached to the upper surface of the lever 26 via a bracket, and a fall prevention rope 9 guided along a path as shown in FIG. 2 is hung upside down.

One end of this rope 9 for fall prevention is wrapped around the rope winding lid drum 4, and after being released from there, it descends from the upper frame of the main body 1 along the support, is reversed and raised by the rope sheep 23, and then The other end of the rear rope 9 is connected to a damper 11 attached to the upper frame.

The maximum force of this damper 11 is set in advance to be less than the rope operating force applied to the rope 9.

The rope operating force applied to the fall prevention rope 9 is received from the hoisting drum 3 driven by the hoisting device 5 in the following manner.

That is, by meshing the gear 15 integrally attached to the first hoisting drum 3 and the gear 14 integrally attached to the rope winding red drum 4, the hoisting drum 3 and the rope winding drum 4 are made to rotate simultaneously. be.

In this case, the gear ratio of each gear 14, 15 is determined by the speed at which the rope sheep 23 hung on the rope 9 is raised and lowered by the operation of the rope 9 by the rope winding drum 4 and the elevating body which is raised and lowered by the operation of the hoisting rope 10. It is set so that the number 2 is the same as the number 2.

According to this embodiment with the above configuration, the lifting body 2 should be raised and lowered at all times, but when the hoisting drum 3 is rotated by the hoisting device 5, it is rotated through each gear 14, 15 at a speed corresponding to the gear ratio. Rope winding drum 4 also rotates at the same time.

Therefore, each rope 9, 10 is operated at the same time,
No relative positional change occurs between the rope sheep 23 and the elevating body 2.

Therefore the rope sheep 23 below the second wedge 22a.

Each member up to 22b is connected to the first wedge 21 a t, 2
1b and the elevating body 2 does not cause a relative position change.

Therefore, the elevating body 2 can normally be moved up and down without any trouble to carry out cargo handling operations.

During this cargo handling work, the rope sheep 23 is moved by the vertical movement of the ropes 9 and 10 that occurs when one or both of the ropes 9 and 10 swings, or when the ropes 9 and 10 move up and down during the acceleration and deceleration of the vertical movement of the vertical body 2. 2, but the rope sheep 23
The horizontal movement is supported and restrained by the first louver 26 which is pin-coupled to the elevating body 2, and the vertical movement is prevented by restraining the first louver 26 in the vertical direction by a shear pin 27 connected to the elevating body 2.

In particular, at this time, even if the vertical movement force is large, the tension of the rope 9 is loosened by the damper 11, so that the force that causes the shear pin 27 to break is applied to the shear pin 27.
It doesn't get across.

Furthermore, each rope 9 connected to the rope sheep 23 and the elevating body 2
Even if an error occurs in the set payout length of 10, this error is absorbed by the damping stroke of the dropper 11,
The relative positional change in the vertical direction between the elevating body 2 and the rope sheep 23 is made zero≦.

As above, the rope sheep, 23 and below the second wedge 22
Each member up to a t 22 b is supported so as not to move relative to the elevating body 2, and the fall prevention device 20 is used to ensure that the time is corrected.
can be kept inactive.

At this time, as shown in FIG.
When indirectly connected to a t 22 b, one shear pin 27 connects each second wedge 22 a , 22 , compared to a direct connection to the second wedges 22 a , 22 b .
b can be restrained so that it cannot move up and down.

Next, when the hoisting rope 10 supporting the elevating body 2 is cut, the elevating body 2 and the operator's cab 8 fall.

In this case, part of the total fall impact force of the elevating body 2 is absorbed by the damper 11 via the rope 9;
Since the extension speed of the damper 11 is much slower than the falling speed of the elevating body 2, most of the falling impact force is caused by the length of the lever 26 between the supporting position of the rope sheep 23 and the mounting position of the shear pin 27. A component force corresponding to the ratio is transmitted to the shearing pin 27, and the shearing pin 27 is cut from the central notch.

When the shear pin 27 cuts in this way, the second lever 26
is swung in the direction of raising the second lever 25 due to the falling weight of the elevating body 2, and the first lever attached to the elevating body 2
The wedges 21a, 2lb are lowered.

Therefore, each of the first and second wedges causes a relative positional change in the vertical direction, and the second wedge 22 a t 22 b moves against the first wedge 2 with a large force equivalent to the falling weight of the elevating body 2.
It bites into between the inclined surfaces of 1a and 21b and the surface of the guide rail 13.

The lifting body 2 is stopped by the frictional force at this time.

At this time, the second wedges 22a, 22b are connected to each lever 24, 2.
Since the second wedges 22a and 22b are suspended by the rope 9 via the guide rails 5 and 26, the second wedges 22a and 22b do not slip on the surface of the guide rail 13 and perform a reliable stopping action.

One shear pin 2 via each lever 24, 25, 26
7 is connected to each of the second wedges 22a, 22b, so compared to a case where each second wedge 22a, 22b has a shearing pin, there is no difference in the cutting timing of the shearing pin, and each second wedge is connected to the second wedge 22a, 22b. 22a.

22b are bitten at the same time, a delay in biting by either side is prevented, and a stable biting operation can be obtained.

If either one bites in quickly, the 23rd lever 2
4 can swing up and down to send the other man's second wedge into the biting position.

When the second wedges 22a and 22b bite into each other, the biting becomes opposite to each other, even if the weight of the elevating body 2 is large.

The locally deformed guide rail 13 surface and the second part, which is a biting wooden member,
Since the frictional force can be obtained extremely stably without causing wedges 22a, 22b, etc., the elevating body 2 can be reliably stopped.

In this embodiment, the rope 9 for fall prevention is indirectly engaged with the rope 9 hanging on the rope sheave 23 installed on the louver 26 via the button-sheave 23. Directly attach the end of the rope 9 to the second lever 2.
6 may be engaged.

In this case, at the same time as the damper 11 becomes unavailable, it is necessary to change the gear ratio of each of the gears 14 and 15 so as not to cause excessive tension or large slack on the rope 9 when the elevating body 2 is raised and lowered.

The function of preventing the falling accident of the elevating body 2 is equivalent to the example in which the second lever 26 is engaged with the rope 9 via the rope sheave 23.

As described above, according to the fall prevention device for an elevating object according to the present invention, the biting member is always maintained at a constant vertical position relative to the elevating object by the fragments cut when the elevating object falls. This prevents unexpected biting motions, and in the event of a fall, the biting motion can be performed using a large force called the impact force of the fall.Furthermore, the biting member is suspended to prevent it from slipping, so the object can be lifted and lowered reliably. This has the effect of making it possible to prevent the device from falling, resulting in a highly reliable device that operates extremely reliably, whether in operation or not.

[Brief explanation of drawings]

Figure 1 is an overall view of a stacker crane that employs an embodiment of the present invention, Figure 2 is an explanatory diagram showing the route of the fall prevention rope in Figure 1, and Figure 3 is an illustration of the fall prevention rope in Figure 1. FIG. 2 is an enlarged view of the device. 1... The main body of the Stadka crane, 2... The elevating body. 3...Hoisting drum, 4...Rope winding drum. 8... Driver's cabin, 9... Rope for fall prevention, 10... Rope for rolling soil, 13... Guide rail, 14.15...
Gear, 20...Fall prevention device, 21a, 21b...First
Wedges, 22a, 22b...Second wedge, 23...
Rope sheep, 24...third lever, 25...second lever, 26...second lever, 27...shear pin.

Claims (1)

[Scope of Claims] 1. In a device for stopping the free fall of the elevating object by inserting a four-piece member between an elevating object and a guide provided along the elevating direction of the elevating object, A lever whose one end is connected to the body so as to be able to move up and down, and a broken piece whose upper end is connected to the middle part of the lever and whose lower end is connected to the elevating body side;
The biting member suspended from the other end of the lever is engaged with the lever after passing the rope from the rope winding device through a member outside the elevating body, and the elevating speed of the engagement point is adjusted to the elevating speed of the engaging point. A fall prevention device for an elevating object having broken pieces, characterized in that the rope winding speed of the rope winding device is set to be the same as the elevating speed of the elevating object. A lifting/resting/falling device with a broken piece according to claim 1, characterized in that a rope sheep is installed on a lever, and the rope is indirectly engaged with the lever via the rope sheep. Prevention device.