JP2010260684A - Variable torque control method of cable reel for feeding crane hoisting accessory - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable torque control method of a cable reel for feeding a crane hoisting accessory that reduces load applied on a feeding cable and a cable reel by suppressing a rewinding force of the feeding cable for feeding the crane hoisting accessory toward the cable reel so as to extend the longevity of the feeding cable and the cable reel. <P>SOLUTION: A cable drawing-out position at a hoisting accessory yard PO is defined as an original point. The rotational amount of a cable reel R from the original point is detected and the cable drawing-out amount is calculated by the detected amount, so that the torque of the cable reel R is variably controlled. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a variable torque control method for a crane suspension power supply cable reel, and in particular, a load applied to the power supply cable and the cable reel by suppressing a winding torque of the power supply cable that supplies power to the crane suspension to the cable reel. The present invention relates to a variable torque control method for a crane suspension power feeding cable reel in which the life of the power feeding cable and the cable reel is extended.

  Conventionally, in an overhead traveling crane, a hoisting device that winds and rewinds a wire rope that suspends and supports a hanging tool such as a bucket so that the hoisting tool such as a bucket can be lifted and lowered on a club arranged to traverse the girder, and a bucket And a cable reel that winds or rewinds the power supply cable for supplying power for performing the opening / closing operation of the suspension tool in accordance with the lifting / lowering operation of the lifting tool. It is configured so that winding or rewinding can be performed smoothly without adjusting the hanging length and applying a load exceeding the weight of the power supply cable to the power supply cable.

By the way, although the hanging length of the feeding cable varies depending on the lifting position of the hanging tool, if the hanging tool is in the lower position and the hanging length of the feeding cable becomes longer, the weight of the feeding cable hanging from the cable reel becomes heavier. A large force is required to wind the power supply cable.
On the other hand, when the lifting device is in the upper position, it can be wound with a small winding force, but at this time, in order to cover the winding force of the power supply cable in the entire lifting / lowering range, When this torque value is set to a fixed torque, when the lifting tool is wound upward, the excess winding torque is less than the small torque required to wind the power supply cable. Since excessive torque is applied to the power supply cable, there is a problem in that the tip portion of the power supply cable is damaged.
Also, it is sufficient to have enough power to slowly wind up the power supply cable when lowering the hoist or taking up the hoist, but when taking up the hoist, follow the cable take-up speed to the hoist take-up speed. If the cable reel winding torque is set to a fixed value, the acceleration force is always applied, which increases the mechanical burden on the power supply cable.

  In view of the above-described problems of the conventional crane suspension power supply cable reel, the present invention reduces the winding force of the power supply cable that supplies power to the crane suspension to the cable reel, thereby reducing the load applied to the power supply cable and the cable reel. It is an object of the present invention to provide a variable torque control method for a crane lifting tool power supply cable reel in which the life of the power supply cable and the cable reel is extended by reducing the length of the power supply cable.

  In order to achieve the above object, the variable torque control method for a crane suspension power supply cable reel according to the present invention uses a cable drawing position at a suspension device as an origin, detects a rotation amount of the cable reel from the origin position, and The cable pull-out amount is calculated from the detected value, and the torque of the cable reel is variably controlled.

  In this case, the required winding torque values required at any two positions of the drawing amount are set according to the detected cable drawing amount, and the drawing amount and the winding torque value are set based on these two values. Thus, the cable winding torque can be varied according to the cable drawing amount by substituting the calculated value of the cable drawing amount into this relational equation.

  Also, the winding torque value to be set should be set to a weak minimum setting value that can slowly wind the power supply cable, and this torque value should be increased in response to the crane hoisting operation signal. Thus, it is possible to accelerate to a speed at which the cable winding speed follows the winding speed of the crane suspension.

  The cable pull-out amount can be measured by the amount of winding of the suspension support wire rope instead of the rotation amount of the cable reel drum (direct measurement). .

According to the variable torque control method for a crane suspension power feeding cable reel of the present invention, the cable drawing position in the suspension device storage is determined as the origin.
Thus, the origin can be determined as it is after the installation of the cable reel, the attachment / detachment of the cable to / from the suspension tool, the replacement of the cable, the maintenance of the cable reel, etc. with the hanging tool placed in the yard. .
Then, the amount of rotation of the cable reel from the origin position is detected, and the amount of cable drawing is calculated based on the detected value so that the torque of the cable reel is variably controlled. The winding torque of the power supply cable to the cable reel can be kept small, and the load applied to the power supply cable and the cable reel can be reduced to extend its life.

  Also, depending on the detected cable pull-out amount, the required winding torque values required at any two pull-out positions are set, and the pull-out amount and the winding torque value are directly proportional based on these two values. By calculating the relational expression and substituting the calculated value of the cable pull-out amount into this relational expression, the cable winding torque is made variable according to the cable pull-out amount. Winding torque on the cable reel can be optimized, and damage to the power supply cable and cable reel can be prevented in advance.

  Also, the winding torque value to be set should be set to a weak minimum setting value that can slowly wind the power supply cable, and this torque value should be increased in response to the crane hoisting operation signal. Thus, the cable winding speed is accelerated to the speed at which the cable winding speed follows the crane lifting speed, so that the cable can always be properly wound according to the winding speed of the lifting tool.

  In addition, when calculating the cable pull-out amount using the winding amount of the suspension support wire rope (indirect measurement), measure the rotation amount of the cable reel drum (directly). Measurement) can be omitted.

It is explanatory drawing which shows one Example of the torque variable control method of the crane reel electric power feeding cable reel of this invention. It is a graph which shows the relationship between the drawing-out amount of an electric power feeding cable, and cable winding torque.

  Hereinafter, an embodiment of a variable torque control method for a crane suspension power feeding cable reel according to the present invention will be described with reference to the drawings.

1 to 2 show an embodiment of a variable torque control method for a crane suspension power feeding cable reel according to the present invention.
Although it is not specifically limited, for example, the overhead traveling crane C is adapted to suspend and support a hanging tool T including a bucket B with a wire rope W, for example, on a club that can traverse on a girder. The hoisting device D and the cable reel R that winds up the power supply cable K that feeds power to open and close the bucket B are disposed, and the hoisting device D is suspended by the hoisting and lowering operations of the wire rope W. The tool T is moved up and down, and the feeding cable K is wound or unwound by the cable reel R following the lifting and lowering operation of the hanging tool T, so that an unnecessary load is not applied to the feeding cable K. Configure.

  Further, although not particularly limited, for example, when lifting and lowering the hanging tool T in the pit P by operating a crane, the landing position of the hanging tool T (the lowest position of the hanging tool, for example, the bottom of the pit) 1) and the maximum allowable ascending position are set as a lifting / lowering range H as shown in FIG. 1, and a lifting device place P0 is disposed at a predetermined position within the lifting / lowering range H, for example, It is formed in a stepped shape so that a hanging tool can be placed on the inner wall of the pit P. Maintenance of the hoisting tool T and the cable reel R for placing the hoisting tool T on the hoisting tool place P0 and performing the work of connecting the power supply cable K to the hoisting tool T and the work of attaching and detaching the hoisting tool when the cable reel R is installed. To do.

  The hanging tool T is not particularly limited, but as shown in FIG. 1 according to the work content, the hanging tool T is provided with a bucket B for holding a suspended load at the lower part of the hanging tool, or a lifting magnet is provided. Thus, the hoisting tool T is raised by winding up (winding) the wire rope W at a predetermined speed by operating the hoisting device D, and on the contrary, the wire rope W is unwound (winded down). Necessary for hanging and supporting in a descending manner and for performing the opening / closing operation of the bucket B of the hanging tool T or the attracting operation by the lifting magnet, etc. via the power supply cable K wound by the cable reel R Make sure to supply the correct power.

The cable reel R has a length of the feeding cable K that is fed out from the cable reel R depending on the raising / lowering position of the feeding cable K when the feeding cable K is wound or rewound following the lifting / lowering operation of the hanging tool T. However, the weight of the feeding cable K fed out changes accordingly, and the winding torque of the cable reel R that winds the feeding cable K inevitably changes.
In the present invention, the winding torque of the cable reel R is variably controlled in accordance with the load of the fed power cable K.

Next, the torque variable control method for the crane suspension power feeding cable reel of the present invention will be described.
When the hoisting tool T suspended and supported by the wire rope W is moved up and down by the operation of the overhead traveling crane C, the power supply cable K is wound so as to feed out only a required length according to the lifting operation of the hoisting tool T. Return or take up.

At this time, the winding torque by the cable reel R is variably controlled. The origin is at the position of the suspension device place P0, and how much the feeding cable K is wound up from the origin, or how much the feeding cable is below the origin. This is performed by detecting whether K has been pulled out.
The detection of the winding amount or the drawing amount of the power supply cable K is not particularly limited. For example, the rotation amount of the winding drum of the cable reel R or the rotation detector attached to the rotating shaft of the winding drum ( (Not shown).

  In this way, the origin of the cable pull-out position at the hanging device place P0 is detected, the amount of rotation of the cable reel R from the original position is detected, the amount of cable pull-out is calculated from the detected value, and the torque variable control of the cable reel R To do.

  Also, based on the detected cable pull-out amount, the required winding torque values at arbitrary two points (two points), for example, at the point A and B point pull-out positions as shown in FIG. Set the torque value A and torque value B, calculate the direct proportional expression of the cable winding torque value with respect to the pull-out amount based on these two values, and substitute the calculated value X of the cable pull-out amount into this formula to replace the cable A winding torque value Y is calculated, and the cable winding torque value is variably controlled according to the cable drawing amount.

  The winding torque value to be set at this time is set so as to be a small minimum set value that is weak enough to slowly wind up the power supply cable K, and a signal for the overhead traveling crane C to wind up the hanging tool T is input. The crane hoist is added by adding to the torque set value a cable winding acceleration torque that the cable winding speed only follows the winding speed of the hoist T by receiving the crane hoisting operation signal. The cable is accelerated to a speed that the cable winding speed follows the winding speed.

  In addition, when the calculation of the cable pull-out amount is measured (indirect measurement) by the winding amount of the suspension support wire rope, measurement of the rotation amount of the cable reel drum (directly) Measurement) can be omitted.

  As mentioned above, although the torque variable control method of the crane suspension power feeding cable reel of the present invention has been described based on the embodiments, the present invention is not limited to the configuration described in the above embodiments, and departs from the gist thereof. The configuration can be appropriately changed within a range not to be performed.

  The torque variable control method for a crane suspension power supply cable reel according to the present invention has a characteristic that a winding torque of the power supply cable to the cable reel is suppressed to be small, and a load applied to the power supply cable and the cable reel is reduced. For this reason, it can be suitably used for bucket crane applications.

B Bucket C Overhead traveling crane D Hoisting device G Girder K Power supply cable R Cable reel P Pit P0 Lifting place T Lifting tool W Wire rope

Claims (4)

  The origin of the cable pull-out position at the lifting device yard, and the amount of rotation of the cable reel from the original position is detected. The amount of cable pull-out is calculated based on this detection value, and the cable reel torque is variably controlled. A variable torque control method for a cable reel for feeding power to a crane suspension.   Based on the detected cable pull-out amount, the required winding torque values required at any two pull-out positions are set. Based on these two values, the relationship between the pull-out amount and the winding torque value is directly proportional. The cable winding torque according to claim 1, wherein the cable winding torque is varied according to the cable drawing amount by substituting the calculated value of the cable drawing amount into the relational expression. Cable reel torque variable control method.   The winding torque value to be set is set so that the power supply cable is weak enough to slowly wind up, and the crane lifting operation signal is received and the torque value is increased. 3. The method for variable torque control of a crane suspension power feeding cable reel according to claim 1, wherein the cable winding speed is accelerated to a speed at which the cable winding speed follows the lifting speed of the lifting tool.   4. The variable torque of the cable reel for power supply of crane suspension according to claim 1, wherein the amount of cable drawing is measured by the amount of winding of a wire rope for hanging support of the suspension. Control method.

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