JP2010149943A - Hoist - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for further improving working efficiency, by leading to an improvement in safety by eliminating cargo swinging, by eliminating the cargo swinging by automatically moving a hoisting machine to a vertical position, by determining the vertical position of the hoisting machine and a cargo without relying on visual observation. <P>SOLUTION: This hoist includes a body part having a hoisting induction electric motor for performing hoisting operation and lowering operation of a heavy load wound with a wire rope and a traverse induction electric motor for making a traverse motion, and moves the body part in the different direction from the body part traverse direction by a travel device. The hoist includes a heavy load position detecting device for determining the positional relationship between the heavy load and the body part, and moves any one of at least the traverse induction electric motor or the travel device so that the heavy load is positioned in the vertical direction of the body part in response to a detection result of the heavy load position detecting device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hoist that lifts a heavy object, and more particularly, to a hoist that reduces load shaking when lifting a load.

  When lifting a load with a hoist such as a hoist or the like, if the load is not lifted in the vertical direction or the direction as close as possible to the hoisting machine, the load will be swayed and dangerous. In order to solve this problem, the conventional load swing reduction method performs a minute hoisting operation so-called inching after a slinging operation, temporarily stops in a state where a wire rope at the time of so-called ground cutting just before the load is lifted, The lifting operation is performed after confirming and correcting that the hoist and the baggage are in the vertical position.

  Further, the position of the center of gravity of the load is detected by the lifting jig, and the lifting jig performs a correction operation to maintain the horizontal state of the luggage and prevent the load from shaking (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 05-147883

  In the conventional method, the center of gravity position of the load is specified and corrected so as to be in a horizontal state, but the load swing is reduced, but if the positional relationship between the hoist and the load is not vertical, the load is removed. When lifting, load swinging occurred, so the vertical position of the hoist and the load had to be matched visually.

  Also, if vertical alignment by inching can be performed near the hoisting machine, vertical alignment by visual observation is also possible, but for example, the load to be lifted is large and the hoisting machine is operated near the hoisting machine. If this was not possible, the vertical alignment by visual inspection could not be performed.

  The object of the present invention is to eliminate the load swing by automatically moving the hoist to the vertical position without relying on the visual judgment of the vertical position of the hoist and the load, and it is safe by eliminating the load swing. It is an object to provide an apparatus that leads to improvement in workability and further achieves improvement in work efficiency.

  In order to solve the above-mentioned problems, the present invention includes a hoisting induction motor for performing hoisting and lowering operations of a heavy object on which a wire rope is hung, and a traverse induction motor for performing a traversing operation. A heavy object position detecting device for determining a positional relation between the heavy object and the main body part in a hoist that includes the main body part provided and is moved by a traveling device in a direction different from the transverse direction of the main body part. And at least one of the traverse induction motor or the traveling device is driven so that the heavy object is positioned in the vertical direction of the main body according to the detection result of the heavy object position detection device. Take.

  According to the present invention, since it is possible to always lift a load in the vertical direction, occurrence of load swing can be reduced.

  Further, since the present invention does not cause a load swing, the safety can be greatly improved.

  Furthermore, since the vertical position of the hoisting machine and the load can be automatically adjusted without relying on visual confirmation according to the present invention, an improvement in work efficiency is achieved.

  Hereinafter, embodiments of the present invention will be described.

The best mode of the present invention will be described below with reference to FIGS. First, the overall configuration and operation of the inverter crane apparatus will be described with reference to FIGS. 1 and 2.
The inverter-type crane device includes a hoisting device 4 equipped with a hoisting induction motor 3 in order to wind and unload a load attached to the crane hook 1 with a wire rope 2 in the Z and −Z directions. , A traverse device 6 having a traverse induction motor 5 for moving in the X, -X directions, and a traverse girder 7, and traveling with a travel induction motor 8 for moving in the Y, -Y directions Device 9 and traveling girder 10 are combined.

  The hoisting induction motor 3 and the traverse induction motor 5 take the instruction from the operation input device 13 into the hoisting / traverse inverter control unit 12 of FIG. 2 stored in the hoisting / traverse inverter device 11 and output a signal. Thus, the hoisting inverter 14 and the traverse inverter 15 are controlled, and the necessary frequency, voltage, and current are added to the hoisting induction motor 3 and the traverse induction motor 5 from the hoisting inverter 14 and the traverse inverter 15, and immediately Then, the load attached to the crane hook 1 is moved in the Z and −Z directions without dropping by controlling the release of the brake 16 for the induction motor. In the case of the traversing device 6, the hoisting device 4 is moved in the X and −X directions along the traversing girder 7.

  Similarly, the traveling induction motor 8 attached to the traveling device 9 outputs an instruction signal from the operation input device 13 by the traveling inverter control unit 18 of FIG. Winding along the traveling girder 10 is controlled by controlling the traveling inverter 19 and applying the necessary frequency, voltage and current from the traveling inverter 19 to the traveling induction motor 8 and immediately controlling the induction motor brake 16 to be released. The upper device 4 is moved in the Y and −Y directions.

3 and 4 are conceptual diagrams showing the main part of the present invention, FIG. 6 is a flowchart of vertical position correction, and FIG. 5 is an explanatory diagram explaining the operation of the detection unit and the operation of the inverter crane apparatus in association with each other.
As shown in FIG. 3, the wire rope 2 fed out from the hoist 20 is fixed to the hoist 20 main body by a wire rope fixed end 21, and the position of the wire rope 2 on the wire rope fixed end 21 side is the same as that of the hoist 20. If the positional relationship of 22 is vertical, there is some deviation depending on the height of the crane hook 1, but it is basically unchanged.

  However, if the positional relationship between the hoist 20 and the load 22 is not vertical, the wire rope 2 on the wire rope fixed end 21 side also tilts in an oblique direction. The inclination is detected by the detection unit 23 attached at the position shown in FIG. 3 to determine the positional relationship between the hoist 20 and the load 22 and the vertical position correction movement is performed by the hoist 20 so that the vertical relationship is obtained.

  Here, it is dangerous to operate the vertical position correction movement when the baggage 22 is lifted and moved. Therefore, the vertical position correction movement can be performed arbitrarily by providing a button for vertical position correction movement on the operation input device 13, for example. Be able to do it.

  Further, the vertical position correction movement may be operated only during the hoisting operation.

  As shown in FIG. 4, the detection unit 23 has limit switches 24A, 24B, 24C, and 24D that surround the wire rope 2 so that the inclination can be detected no matter which direction the wire rope 2 is tilted. ing. The limit switches 24A and 24C are connected to the hoisting / traverse control inverter control unit 12, and the limit switches 24B and 24D are connected to the traveling inverter control unit 18.

  As shown in FIG. 6, when the wire rope 2 comes into contact with one of the limit switches and the limit switch is bent from the contact portion, the control inverter control unit is configured to travel a predetermined distance according to the degree of the curve. 12 and / or a detection signal is transmitted to the inverter control unit 18.

  The control inverter control unit 12 and / or the inverter control unit 18 drives the motor 5 and / or the motor 8 and moves the hoist 20 according to the detection signal transmitted from the limit switch.

  Here, the sensor for detecting the inclination of the wire rope 2 is not limited to the limit switch 24, and may be, for example, an optical sensor that can capture the movement of the object.

  The inclination of the wire rope 2 is detected by the detection unit 23, and how the inverter crane apparatus 25 operates will be described with reference to FIGS.

  When the vertical position correction is started, a hoisting operation is first performed (step S1), load information is obtained from the current value of the hoisting induction motor 3 (step S2), and whether or not a load state is obtained from the load information. Is confirmed (step S3).

  The reason for confirming the load state in this way is that if the wire rope 2 is in a loose state, accurate vertical position correction cannot be performed, and therefore it is necessary to put a load on the wire rope 2. . Moreover, instead of confirming the load state based on the current value of the hoisting induction motor 3, the load state may be confirmed using a device such as a load cell that can determine the load. When the control inverter control unit 12 detects the load state and the wire rope 2 is stretched, the hoisting operation is stopped (step S4), and the control inverter control unit 12 and the inverter control unit 18 limit the detection unit 23. The switch state is confirmed (step S5), and the vertical position correction movement is performed (step S6). And it is judged whether the detection part 23 is operate | moving (step S6). If it is determined that the detection unit 23 is operating (YES), it is determined that the wire rope 2 is tilted, and the hoist 20 is moved to a position where the limit switch 24 returns to the uncurved state (step S7). . If it is determined that the detection unit 23 is not operating (NO), the vertical position correction operation is terminated.

  In the case of pattern 1 in FIG. 6, since the limit switch 24 in the east direction is operating, the inverter-type crane device is moved in the east direction, which is the direction in which the limit switch 24 is returned.

  Similarly, in the case of the pattern 2 in FIG. 6, since the limit switch 24 in the east direction and the south direction is operating, the inverter crane apparatus 25 is moved in the east and south directions, which are directions in which the limit switch 24 is returned.

  By repeating such processing, the vertical position correction is terminated when the detection unit 23 stops operating even in a load state.

  As described above, since the vertical position can be automatically adjusted without relying on visual confirmation, an improvement in work efficiency is achieved. Moreover, since the vertical position is matched, the load fluctuation can be reduced. In addition, the load will be reduced, leading to improved safety.

The perspective view showing the whole structure of an inverter type crane apparatus Block diagram showing the control configuration of the inverter crane Schematic diagram representing the concept of the present invention Schematic diagram of the detector Flow chart of vertical position correction operation Explanatory drawing of vertical position correction operation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Crane hook, 2 ... Wire rope, 3 ... Hoisting induction motor, 4 ... Hoisting device, 5 ... Traverse induction motor, 6 ... Traversing device, 7 ... Traverse girder, 8 ... Traveling induction motor, 9 ... Traveling device, 10 ... Traveling girder, 11 ... Hoisting / traverse inverter device, 12 ... Hoisting / traverse inverter control unit, 13 ... Operation input device, 14 ... Hoisting inverter, 15 ... Traverse inverter, 16 ... Brake for induction motor, 17 ... Traveling inverter device, 18 ... Traveling inverter control unit, 19 ... Traveling inverter, 20 ... Hoist, 21 ... Wire rope fixed end, 22 ... Luggage, 23 ... Detection unit, 24 ... Limit switch, 25 ... Inverter type crane equipment

Claims (5)

It has a main body portion equipped with a hoisting induction motor for performing hoisting operation and lowering operation of a heavy object on which a wire rope is hung, and a traverse induction motor for traversing operation, and travels. In the hoist in which the main body is moved in a direction different from the main body transverse direction by a device,
A heavy object position detecting device for determining a positional relationship between the heavy object and the main body, and at least the heavy object is positioned in a vertical direction of the main body according to a detection result of the heavy object position detecting device; A hoist that drives either one of the traverse induction motor or the traveling device.   The hoist according to claim 1, wherein the heavy object position detection device includes a mechanism that detects an inclination of the wire rope.   The hoisting induction motor is controlled by an inverter unit, and the first inverter unit causes the hoisting operation to be performed by the hoisting induction motor. The hoist according to claim 1, wherein it is determined whether or not a heavy object is suspended from the wire rope.   When it is determined that a heavy object is suspended from the wire rope, the inverter unit winds up the wire rope with the induction motor until the wire rope is in a tensioned state. The hoist according to claim 3.   The hoist according to claim 4, wherein the heavy object position detection device detects an inclination of the wire rope in a state where the wire rope is stretched.

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