JPH0577595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead crane device for use in factories, warehouses, etc.

[Conventional technology]

FIGS. 4 and 5 are a side view and a front view showing a conventional method of positioning an overhead crane device as shown in, for example, JIS B 8801 so as to be able to lift a suspended load. In the figure, 1 is a pair of running rails placed on a steel support in a factory, and 2 is a rail 1.
The girder of the overhead crane was able to travel above the girder, 3 was attached to a predetermined position on girder 2, and the operator's cab had a control device; 4 was arranged so that it could move above girder 2 in the longitudinal direction of girder 2. Trolley, 5 is a drum provided on the trolley 4, 6 is a wire rope that is wound or unwound by the rotation of the drum 5, 7
is an equalizer sheave to which the end of the wire rope 6 is fixed, and is attached to the trolley 4. 8 is a hook supported by the wire rope 6, 9 is a suspended load, that is, an object to be lifted, 10 is a rigging operator, 11 is a crane operator, 12 is a trolley 4, that is, the moving direction of the hook 8, and 13 is a digit 2, that is, a crane. hook 8 in the longitudinal direction of the 14-digit 2
15 is a shift between the center of the hook 8 and the center of gravity of the hoisted object 9 in the traveling direction of the crane, and 16 is an electromagnetic brake.

In such an overhead crane device, the positions of the crane 2, trolley 4, and hook 8 are controlled by the operator 11.

Next, the positioning of the hook 8 and the lifted object 9 will be explained. For example, when lifting an object 9 placed in a factory, the operator must
1, the girder 2, that is, the crane, approaches the hoisted object 9, and while observing the hand signals of the sling operator 10, controls the movement of the trolley 4 toward the center of gravity of the hoisted object 9, so as to cover the center of the hook 5. Match the center of the suspended object 9. In this way, the driver 11's own visual measurements confirm that the deviation between the center of the hook 8 and the center of gravity of the lifted object 9 in each direction is approximately zero.

At this time, the sling operator 10 lifts the trolley 4 onto the sling 2.
Since it is difficult for the driver 11 to confirm the position of the hook 8 in the longitudinal direction, that is, in the transverse direction 13, the movement of the trolley 4 is guided by hand signals, and the center of the hook 8 and the lifted object 9 are I am trying to match the center of gravity of the two.

[Problem that the invention seeks to solve]

Since the conventional overhead crane device is configured as described above, the method for confirming the traverse center is performed as described above. Therefore, in a crane with a fixed operator's cab, it is difficult for the operator to visually assess the deviation between the center of gravity and the hoist center in the traversing direction, and the operator has to rely on the rigging operator to confirm this. The problem was that it was troublesome.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an overhead crane device in which the hook center can be easily confirmed.

[Means for solving problems]

The overhead crane device according to the present invention emits a light beam in the direction of the hook center, and by checking the light spot from the driver's cab, it is possible to visually check the deviation between the center of gravity of the hoisted object and the hook center.

[Effect]

In the overhead crane device of the present invention, a light spot projected directly onto the surface of the object to be hoisted by the light beam emitted from the light beam generator can be easily visually confirmed from the driver's seat which is higher than the object to be hoisted.

〔Example〕

An embodiment of the present invention will be described below.
In Figures 1 and 2, 2, 4 to 9, 12 to
16 is the same as the conventional one. 17 is trolley 4
A pair of light irradiation devices installed on the same trolley as the trolley 4 so as to face each other horizontally with the hook 8 in between, and on a vertical line drawn downward from the hook 8. During the movement of the girder 2 and the trolley 4, the two spot beams intersect below the height of the hook 8. As shown in FIG. 8, this light irradiation device 17 has, for example, a halogen lamp 20 attached to one side of a case 19 connected to a mounting bracket 18, and a lens 21 having a predetermined focal length attached to the other side of the case 19. The flashing is controlled from the driver's cab 3. Reference numeral 22 denotes a light beam emitted from the light beam irradiation device 17, which is adjusted so that the irradiation angles at which the pair of light beams 21 intersect at a predetermined distance are approximately equal.

Next, the alignment operation between the hook 8 and the lifted object 9 will be explained. When the crane operator 11 moves the crane 2 toward the object 9 to be lifted placed in the factory, the crane operator 11 operates the light beam irradiation device 17 while approaching the object 9 to be lifted at a reduced speed. As a result, the light point of the irradiated light ray 22 and the digit 2
The slinging operator 10 confirms the deviation from the center of gravity of the suspended load 9 in the direction 13 parallel to the direction 13, and guides the driver 11 to move with a hand signal. to be almost on the same line as the center of gravity of the lifted object 9. Next, driver 1
1 performs the lateral movement 12 operation of the trolley 4 while observing the light spot of the light beam 22 and the hand signal of the sling operator 10, and confirms that the light beam 22, the light spot, and the center of gravity of the suspended object 9 match. to stop the movement of the crane, and move the crane to the hook 8 according to the instructions of the rigging operator 10.
lower it to the specified position. As a result, the slinging operator 10 hooks the wire rope that has been hung over the object 9 to the hook 8, and sends a signal to the driver 11 to raise the hook 8.

Here, in FIG. 2, a case is shown in which one light spot is formed on the suspended object by the two light beams 22 emitted by the two light beam irradiation devices 17, but the light beam irradiation devices 17 When the irradiation angles of the light beams 22 are fixed so as to intersect at predetermined positions, when the height of the suspended object 9 from the floor is higher than the reference height as shown by the broken line in FIG. When the height is lower, the number of light spots irradiated onto the suspended object 9 is two each, and therefore, approximately the center of the interval between the light spots is determined as the center of gravity position. Therefore, by measuring in advance the deviation between the light spot and the center of the hook, which changes depending on the height of the suspended load, the same operation as in the above embodiment can be achieved even with a single light irradiation device. You can expect it.

Note that the distance to the light spot of the light irradiation device may be measured and the light irradiation angle of the light irradiation device may be adjusted so that the light spot is on the vertical line of the hook, or a laser beam irradiation device may be used. good.

Also, if the light rays are colored by a predetermined means,
Visual confirmation from the driver's cab becomes easier.

Furthermore, although the above embodiments have been explained in the case of a trolley type crane, the same effects as in the above embodiments can be expected even when used in a hoist type crane.

〔Effect of the invention〕

As described above, according to the present invention, since the light point is irradiated so that the position perpendicular to the center of gravity of the hoisted object is almost the same as the hook, both the sling operator and the operator can easily check the position. can.

This improves the efficiency of crane sling work.

[Brief explanation of the drawing]

1 and 2 are a front view and a side sectional view showing a crane device according to an embodiment of the present invention, and FIG. 3 is a perspective view of a light irradiation device. FIGS. 4 and 5 are a front view showing a conventional crane device. FIG. 2 is a diagram and a side sectional view. In the figure, 1 is a traveling rail, 2 is a girder, 3 is a driver's cab, 4 is a trolley, 9 is a suspended object 17, a light beam generator, and 22 is a light beam. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A driver's cab is provided on a girder movably supported on a pair of rails, and an object to be lifted is lifted by a hook provided on a trolley whose movement is controlled in the longitudinal direction of the girder. , a light beam emitting device for emitting a pair of spot beams to the trolley is disposed perpendicular to the moving direction of the trolley and horizontally opposite to the hook across the hook, and is pulled downward from the hook. An overhead crane device characterized in that the two spot beams intersect below a hook on a vertical line. 2. The overhead crane device according to claim 1, characterized in that the light beam has a predetermined color tone.