JP2005145599A - Safety means by crane slinging work balance indication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device by crane slinging work balance indication. <P>SOLUTION: This safety device by crane slinging work balance indication carries out color coding of two hooks under a moving beam and is constituted by setting a color coding lamp on a computation display device and providing a mechanism capable of discriminating whether either of the hooks under the moving beam is applied with a large load or not by lighting of the color coding lamp. Additionally, this safety device by crane slinging work balance indication is constituted by providing a function capable of variably setting a load difference of the two hooks under the moving beam and providing a mechanism to stop winding-up motion in the case when the load difference exceeds a set value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a safety device with a crane sling balance display in the process until the difference between the center of gravity and the hung position of a suspended load is clarified by a calculation display device during a slinging operation of a crane with a swivel type moving beam that performs two-point suspension. It is about.

  Conventionally, as a sling balance check device, for example, Japanese Patent Laid-Open No. 10-7380 (Patent Document 1) is known. FIG. 3 shows a technique according to Patent Document 1. FIG. 3 is a view showing a conventional sling balance checking device. As shown in FIG. 3, a moving beam having a sling wire 2 of a suspended load 1 at the lower portion, two hooks 3 and 3 for engagement, and two pulleys 4 and 4 at the upper portion are spaced apart from each other in the center of symmetry. 6 and the two winding wires 5 and 5 passed through the two pulleys 4 and 4 are simultaneously wound or unwound to raise or lower the moving beam 6. A crane for two-point suspension is configured from a fixed beam 8 provided with two weighers 9 and 10 in which the other ends of the wires 5 and 5 are suspended so as to be weighed.

  FIG. 4 is a schematic diagram for explaining the principle of the conventional apparatus. As shown in FIG. 4, as in FIG. 3, the hanging load 1 is hung with the sling wires 2 and 2, and the sling wires 2 and 2 are respectively hung on the hooks 3 and 3 provided at the lower part of the moving beam 6. Hanging. At this time, the two hooks 3 and 3 are provided on the beam with an equal interval from the center of the beam, and the two pulleys 4 and 4 are also provided on the beam with an equal interval from the center of the beam. Therefore, the center of the hanging width L of the suspended load 1 exists at the position of the center of the beam.

On the other hand, the suspended load 1 is slung so that the load is applied to the left and right sling wires 2 and 2 as evenly as possible. occurs, a difference may appear in the detection weight W ₂ of the sensing weight W ₁ and the weighing device 10 of the weighing device 9. The difference between the detected weights of the two weighing devices 9 and 10 is operated only by the sling balance check device in the two-point hanging crane provided in the calculation display device 11. That is, the difference between the detected weights of the two weighing devices 9 and 10 remains only in the sling balance check device in the two-point hanging crane provided in the calculation display device 11. In addition, when the fixed beam 8 becomes a swivel crane, it becomes a swivel beam so that the entire lower apparatus swivels.

However, the slinging work in the steel industry has a high number of disasters and there are concerns about safety problems. However, the conventional technology disclosed in Patent Document 1 cannot completely prevent the danger prevention.
Japanese Patent Laid-Open No. 10-7380

  In order to solve the problems described above, the inventors have made extensive developments. As a result, in the conventional case, when the moving beam is tilted when the suspended load is lifted, the winding operation does not stop. The suspended load may collapse. In addition, it was found that it was difficult to determine which side of the hook had a large load when turning the crane by simply looking at the indicator. I found out to eliminate.

The gist of the invention is that
(1) The two hooks under the moving beam are color-coded by the moving beam, and a color-specific lamp is installed in the calculation display device, and the color-specific lamp is lit to determine whether any of the hooks under the moving beam is under heavy load. A safety device with a crane sling balance display, characterized in that a mechanism that can be discriminated by the above is provided.
(2) A crane sling balance display that has a function that can variably set the load difference between the two hooks under the moving beam, and a mechanism that stops the hoisting operation when the load difference exceeds the set value. By safety equipment.

  As described above, the present invention improves safety by operating a safety device to stop hoisting when lifting a suspended load in a poor balance state. In addition, a lamp for each color is attached to the calculation display device, and when a lamp is lit, the side of the moving beam that is under heavy load is immediately discriminated by the lit lamp color and the moving beam color. In this way, it is possible to completely eliminate the danger prevention by configuring so that the sling can be corrected.

Hereinafter, the present invention will be described in detail with reference to the drawings.
The present invention provides a mechanism for electrically stopping the hoisting operation when the numerical value is large based on the difference between the detected weights of the two weighing devices 9 and 10 as shown in FIG. In addition, since the calculation display device 11 is fixedly installed on the crane side, it is difficult to know which side of the moving beam 6 is heavily loaded when it is a swiveling crane. 3 is classified by color into the moving beam, and the calculation display device 11 is provided with not only numerical values but also lamps according to the colors of the hooks 3.

  By adopting the configuration as described above, due to the load difference of the calculation display device, for example, when a 7 m material is the target material, the reference numerical value for stopping the hoisting is less than 500 kg, the inclination of the suspended load is small, which hinders transportation. Never come. Moreover, since safety is important, if the load difference is made too small, the efficiency of slinging will be reduced. If the numerical value of the load difference of the calculation display device is made variable depending on the length of the suspended load, it can easily cope with changes in work. Also, in the event of an emergency, when the winding cannot be operated, an immediate response becomes difficult, and thus a mechanism capable of releasing the winding stop due to the load difference is provided.

  Also, do not place any restrictions on lowering. Be sure to allow free operation because the slinging correction is required when the load difference is large. The lamp installed in the calculation display device flickers when it is traversed and traveled after the hoisting is stopped, so the lamp blinks. Various measures were taken, such as keeping the lamp off when the winding notch was not inserted. For this reason, it was possible to eliminate the cause of the ball break due to frequent lighting.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The colors of the lamps are distinguished by hooks, and the colors are classified by moving beams. Moreover, it is configured to be set according to the color of the calculation display device. In addition, as a lamp lighting condition, the lamp can be lit only in the case of winding “with winding notch”.
FIG. 1 is a diagram showing a flow of lighting a lamp using an apparatus according to the present invention. As shown in FIG. 1, when the operation power is ON and the hoisting device “winding” is ON and the weighing devices 9 and 10 are equal, the hoisting is possible, and when the weighing devices 9 and 10 are not equal, It is determined whether the side is large and the large side lamp is turned on.

FIG. 2 is a flow chart in which the hoisting is stopped due to the load difference applied to the two hooks. As shown in FIG. 2, when the difference between the weighing instruments is not equal, the operation power source is “ON” and the hoisting device “winding” is ON, and the load condition is constantly monitored. The load condition is monitored by an overload (the load of each of the weighing machines 9 and 10 and the total load of the weighing machines 9 and 10) and the load difference between the weighing machines 9 and 10. When each load condition is exceeded, there is a relationship of swinging of the load. If the load condition is exceeded even after 5 seconds or more have elapsed, the hoisting device “winding up” is stopped. Winding is possible while within the conditions.
In addition to this, the present invention is provided with a mechanism capable of changing the setting of the load difference and a mechanism capable of releasing it. Note that it is not necessary to set an interlock function for lowering under the condition due to the load difference.

It is a figure which shows the flow which makes a lamp light using the apparatus which concerns on this invention. It is a flowchart which makes a winding stop by the load difference concerning two hooks. It is a figure which shows the conventional sling balance check apparatus. It is a schematic diagram explaining the principle of a conventional apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspended load 2 Hanging wire 3 Hook 4 Pulley 5 Wire 6 Moving beam 7 Winding drum 8 Fixed beam 9 Weighing instrument 10 Weighing instrument 11 Calculation display apparatus


Patent Applicant Sanyo Special Steel Co., Ltd.
Attorney: Attorney Shiina

Claims (2)

The two hooks under the moving beam are color-coded by the moving beam, and a color-specific lamp is installed in the calculation display device, and it is possible to determine whether any of the hooks under the moving beam is under heavy load by lighting the color-specific lamp. A safety device with a crane sling balance display characterized by a mechanism. A safety device with a crane sling balance display, which is provided with a function that can variably set the load difference between the two hooks under the moving beam, and a mechanism that stops the hoisting operation when the load difference exceeds the set value. .

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