JP2005082276A - Automatic lifting magnet crane device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic lifting magnet crane device capable of preventing the occurrence of handing failure of a steel plate. <P>SOLUTION: The automatic lifting magnet crane device comprises a plurality of electromagnets suspended from a main beam, a current supplying means supplying an excitation current to the electromagnets, a magnetic flux detecting means for detecting magnetic flux generated by the electromagnets, a hoisting/lowering means for hoisting/lowering the electromagnets, and a processing means for detecting the total thickness of the steel plates which the electromagnets attract, from the excitation current and the magnetic flux. An extending portion is provided in an axial direction of the main beam, and an auxiliary lifting magnet is provided at the extending portion so as to ascend and descend. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lifting magnet crane apparatus of a type in which a steel plate is attracted and lifted by a plurality of electromagnets suspended from a main beam, and more particularly to an automated lifting magnet crane apparatus that can prevent suspension failure.

The lifting magnet crane device lifts a steel plate using magnetic force, and as shown in FIG. 5, a plurality of lifting magnets (hereinafter also referred to as lift magnets) 5-1 to 5-J are used for attracting steel plates. The main beam 4 is suspended by the lifting tools 7-1 to 7-J at substantially equal intervals in the axial direction.
By providing a plurality of lifting magnets in the axial direction of one beam, a steel plate P having a length longer than the thickness, for example, a thick steel plate is attracted and lifted by electromagnetic force. Suitable for carrying.

  The steel plates and the like that are to be lifted by the crane are normally stacked with steel plates of different thicknesses and lengths to form so-called “mountains”. When a lifting magnet is placed on this mountain and excited, the steel plates other than the lifting target are magnetized, and it is extremely difficult to control the number of lifted sheets. I had to.

There have been proposed an automated lifting magnet crane device that improves these points and automatically controls the number of lifts, a lifting magnet crane device that prevents overhanging from the weight information of the load cell, and the like (for example, Patent Document 1). , 2).
However, these methods can prevent suspension failure when piles of stacked steel plates are stacked with steel plates of various lengths that did not cause problems when they are composed of steel plates of approximately the same length. Occurred.

FIG. 4 shows a lifting magnet formed by stacking a plurality of short steel plates (hereinafter also referred to as short steel plates) P ₂ and P ₃ on such a long steel plate (hereinafter also referred to as long steel plates) P _1. An example of the situation when it is lifted by is shown.
Lifting magnet Chakuyukashi on short steel top, after adsorption of these steel sheets by supplying an excitation current, when increasing the beam, of the run-off steel sheet from the end of the lifting magnet of the long steel P ₁ parts (hereinafter, also referred to as an overhang) is deflected with increasing lifting magnet and a gap occurs between the short steel plate P ₂ located above the elongated steel P _1.

This gap, although while in contact with the upper surface of the lower of the steel plate P ends of protruding portions of the long steel P ₁ of the lowermost is not lifting the object is small, leaving an upper surface of the steel plate P (ground cutting) When it comes to the maximum. When such a gap is generated, the adsorption force to the long steel plate is reduced, and the long steel plate cannot be lifted, and the suspension may fail.

  In order to avoid such suspension failure of the protruding portion (overhang portion) of the steel plate, the lifting magnets are arranged at equal intervals with respect to the maximum length of the steel plate, or the end of the shortest steel plate is used. The method of adjusting the position of the steel plate, adjusting the exciting current of the lifting magnet according to the size and thickness of the steel plate, controlling the attracting force, correcting the excitation current value by estimating the deflection of the steel plate, etc. (For example, refer to Patent Documents 3 and 4).

However, the method of adjusting the arrangement position of the lifting magnet requires that the steel plate be arranged at the lower part of the lifting magnet so that it does not incline due to a step on the plate surface or does not form a gap. It is constrained by the plate length.
In addition, in the method of adjusting the excitation current and the method of correcting the current value by estimating the deflection of the steel plate, the steel plate to be lifted and the lower steel plate not to be lifted are separated by the space created by the lifting. That is, before the ground is cut, an excessive correction current is supplied to apply an adsorption force, so that there is a problem that even a steel plate that is not a lifting target is adsorbed.

As described above, in the conventional lifting magnet device and the control method, it is not possible to prevent the plate of the protruding portion (overhang portion) of the steel plate from being lifted during lifting, and due to a gap caused by this, the suspension of the steel plate, such as dropping, is caused. Failure cannot be prevented.
In addition, in the conventional lifting magnet crane device, each lifting magnet is suspended at the same height by a lifting tool, and in order to make each suspension height adjustable, it becomes a large structure and is not realistic. Absent.

Japanese Patent Laid-Open No. 2-295889 JP 11-139749 A Japanese Patent Laid-Open No. 3-128888 Japanese Patent Laid-Open No. 3-128891

  The present invention provides an automated lifting magnet crane apparatus that can prevent the occurrence of suspension failure when lifting steel sheets including steel sheets having different lengths with an automated lifting magnet crane apparatus.

  The present invention is a lifting that can lift a pile made of steel plates of different lengths without causing suspension failure by appropriately lifting a portion protruding from the end of the main lifting magnet of the steel plate in the axial direction. A magnetic crane device, the gist of which is as follows.

  (1) A plurality of electromagnets suspended from a main beam, current supply means for supplying an excitation current to the electromagnet, magnetic flux detection means for detecting a magnetic flux generated by the electromagnet, lifting means for raising and lowering the electromagnet, and the excitation In a lifting magnet crane apparatus provided with a processing means for detecting the total thickness of the steel plates adsorbed by the electromagnet by current and magnetic flux, an extension is provided in the axial direction of the main beam, and the extension can be raised and lowered An automatic lifting magnet crane device characterized in that an auxiliary lifting magnet is provided on the top.

  (2) The automatic lifting magnet crane apparatus according to (1), wherein the auxiliary lifting magnet is a permanent magnet.

  (3) The automatic lifting magnet crane apparatus according to (1) or (2), wherein an extension portion is provided so as to be movable back and forth in the axial direction of the main beam.

According to the present invention, it is possible to lift only the protruding portion even when lifting steel plates having different lengths in length. Therefore, conventionally, the suspension failure caused by the gap caused by the bending of the protruding portion is prevented. It is possible to improve the work efficiency by reducing the re-hanging work.
In addition, as described above, even if the protruding portion is long, it can be lifted in a lump, so the restriction on the length (excess) in stacking of steel plates in the yard is eased, and the management work of the storage place becomes easy. .

A lifting magnet crane according to an embodiment of the present invention will be described with reference to the drawings of the embodiments.
FIG. 1 is a schematic diagram illustrating an example of a lifting magnet crane apparatus according to the present invention, and FIG. 2 is a schematic diagram illustrating details of a portion A in FIG. 1.

In FIG. 1, a lifting magnet crane apparatus includes a traveler 2 moving on fixed rails 1-1 and 1-2, a post 3 engaged with the traveler 2 so as to be movable up and down, and a main beam 4 fixed to the tip of the post. , Main lifting magnets (hereinafter also referred to as main lifting magnets) 5-1, 5-2 and landing sensors suspended from the beam, a moving device for moving the load cell 6 and the traveler 2 for detecting a suspension load, and a post A lifting / lowering device that lifts and lowers, an interval adjusting device that adjusts an interval between the lift magnets, and a control device, and an auxiliary lifting magnet 10.
In FIG. 1 and FIG. 2, the landing sensor, the moving device, the lifting device, the (distance sensor), the interval adjusting device, and the control device are not shown. Moreover, although illustrated as an apparatus provided with two main lifting magnets, it is not limited to this.

In FIG. 2, main lifting magnets 5-1 and 5-2 (hereinafter referred to as a main lifting magnet 5) are attached to the main beam 4 via an attachment member 8 and a lifting tool 7. A cord (not shown) for supplying a current is connected to the magnet 5.
In addition, a distance adjusting device (not shown) is attached to the attachment member 8, and the lifting tool 7 can be moved along the beam 4. The axial direction of the beams of the main lifting magnets 5-1 and 5-2. The position and the distance between each other can be changed.

The overall movement of the automatic lifting magnet will be described with the main lifting magnet 5 as the center (the operation of the auxiliary lifting magnet will be described later).
The main lifting magnet 5 has an electromagnet composed of a magnetic core 51 and an exciting coil 52, and magnetic flux detection means 53 for detecting a magnetic flux passing through a part of the magnetic core, and is lowered onto a steel plate to be lifted. Thereafter, the electromagnet of the main lifting magnet 5 is supplied with a preset excitation current from the current supply means for generating an attracting force necessary for lifting, and attracts the steel plate. Next, the main lifting magnet is raised by the lifting device to lift the steel plate.
Here, Patent Document 1 indicates whether or not a predetermined steel plate is properly lifted by a processing means for detecting the total thickness of the adsorbing steel plates provided in the automatic lifting magnet crane or a load cell for detecting a suspension load. The determination is performed in the same manner as described in (1).

  An extension beam 9 extending in the axial direction is attached to an end portion of the main beam 4 in the axial direction, and an elevating device 11 is attached in the vicinity of the distal end portion thereof. The lifting device 11 is attached with an auxiliary lifting magnet 10 via a hanger 12 attached to the tip thereof. In addition, a load cell 13 for an auxiliary lifting magnet is provided between the extension beam 9 and the lifting device 11 so that the lifting state of the protruding portion can be confirmed by detecting the load of the load cell 13.

  As described above, the auxiliary lifting magnet is longer than the short steel plate of the long steel plate located below the short steel plate when lifting a plurality of steel plates including steel plates having different lengths (long steel plate and short steel plate) collectively. A portion, that is, a protruding portion (overhang portion) (B portion in FIG. 2) is adsorbed and lifted.

  The auxiliary lifting magnet 10 may be composed of an electromagnet similar to the main lifting magnet 5, but the electromagnet has a large magnetic penetration depth and may be attracted to a lower steel plate that is not a lifting target. Therefore, when adhering the protruding portion of about one or two steel plates as described above, it is preferable to use an electromagnet having a small magnetomotive force to prevent the adsorption of materials other than the steel plate to be lifted.

  Further, the auxiliary lifting magnet 10 may be a permanent magnet having a small magnetic penetration depth. The lifting magnet using a permanent magnet has a small magnetic flux penetration characteristic, and can easily separate the steel plate below the protruding portion of the steel plate without attracting the steel plate below the protruding portion. it can.

  Further, a permanent electromagnetic type lifting magnet (permanent electromagnetic lifter) is suitable for an auxiliary lifting magnet because the operation as a lifting magnet can be switched by turning on and off the current, and it is not necessary to energize continuously.

  As the lifting device 11 for the auxiliary lifting magnet, a known device having a lifting function such as an electric type, a hydraulic type, or a mechanical winding method can be adopted.

Further, the length of the extension beam 9 is set so that the length of the protruding portion of the steel plate (amount of overhang) varies and the auxiliary lifting magnet 10 can be lowered to an appropriate position within the variation range. . However, when the fluctuation range is large, the extension beam 9 is provided with an expansion / contraction mechanism (not shown) such as a hydraulic cylinder so that the extension beam 9 can advance and retreat in the axial direction of the main beam 4. It is preferable.
With such a configuration, even when the length of the protruding portion varies greatly, the lowered position of the auxiliary lifting magnet 10 can be controlled to an appropriate lifting position of the protruding portion.

  In the description of FIGS. 1 and 2, the auxiliary lifting magnet 10 is provided only on one side of the main beam 4, but may be provided on both sides of the main beam. By doing so, the position of the protruding portion of the steel plate can be accommodated in any direction (left and right) of the main beam axis, and management of the ridges of the steel plate can be further eased.

Next, a method for lifting a steel plate by the lifting magnet crane apparatus of the present invention will be described.
As schematically shown in FIG. 3, the control device is composed of a host computer and a PLC (sequencer). The host computer is used to set up the lifting and lifting information for the automatic lifting magnet crane. The control related to the lifting of the steel plate is performed.

In addition, the PLC includes a main load cell, sensors such as a landing sensor, a lifting device for a post, a driving device including a lift magnet interval adjusting device, a lifting device for an auxiliary lifting magnet, a load cell, a main lifting magnet, and an auxiliary lifting. A current supply unit REG to the magnet is connected.
The current supply unit REG is a power supply device that supplies current to the electromagnet of the main lifting magnet and the electromagnet of the auxiliary lifting magnet or the permanent electromagnetic lifter according to instructions from the PLC.

  In FIG. 3, the sequencer is used, but other control devices may be used as long as they perform control related to driving control of a crane, a lifting device, etc. and lifting of a steel plate.

  The host computer is lifted and moved from the “mountain” where the steel plate to be moved is located, the dimensions (thickness, length, width) of the steel plate constituting the “mountain”, and the “mountain”. Information on the number of target steel sheets n, the height of the target steel sheet, the length of overhang (overhang amount), the thickness of the overhang part (overhang part), the position of the “mountain” of the destination, etc. to the PLC of the crane Giving and instructing the lifting.

  The PLC selects the main lifting magnet according to information and instructions from the host computer, adjusts the interval, sets the excitation current value to be supplied, and further lowers the lifting distance of the lifting device of the auxiliary lifting magnet, that is, lifts The difference in height between the uppermost stage of the target steel plate and the upper surface of the protruding portion, and when the auxiliary lifting magnet is an electromagnet or a permanent electric lifter, the excitation current value is set.

The traveler 2 is stopped above the steel plate to be lifted, the post 3 is lowered by the lifting device, the main lifting magnet 5 is lowered, and the steel plate is placed on the uppermost steel plate.
Next, the auxiliary lifting magnet lifting / lowering device 11 is operated to lower the auxiliary lifting magnet 10 and land on the protruding portion of the steel plate.

  When the extension beam 9 has an expansion / contraction mechanism, prior to lowering the auxiliary lifting magnet 10, the extension mechanism 9 is operated to advance and retract the extension beam 9 in the axial direction, so that the auxiliary lifting magnet 10 is protruded from the steel plate. Adjust so that it descends to a predetermined position.

  Next, a predetermined exciting current is supplied to the electromagnet of the main lifting magnet 5 from the current supply means (REG) to attract the steel plate, and the current is also supplied to the electromagnet or the permanent electromagnetic lifter of the auxiliary lifting magnet 10 so as to protrude. Adsorb steel plate.

  Next, the lifting device 11 starts to lift the post 3 and the lifting device 11 of the auxiliary lifting magnet also starts to lift, and confirms that the protruding portion is lifted by the load cell 13 of the auxiliary lifting magnet. When it is determined that the whole is lifted and it is determined that the lifted state is complete, the lifted state is further lifted and then transported. Further, when it is determined that the lifting state is incomplete, the lifting is attempted again, and after it is determined that the lifting state is complete, it is lifted higher and then transported.

It is a schematic diagram which shows an example of a structure of the automatic lifting magnet crane apparatus of this invention. It is a schematic diagram explaining A part of the automatic lifting magnet crane apparatus of this invention in detail. It is a schematic diagram which shows an example of the control system of the automatic lifting magnet crane apparatus of this invention. It is a schematic diagram which shows the relationship between lifting control and the state of bending of a steel plate in the automatic lifting magnet crane apparatus of this invention. It is a schematic diagram which shows an example of the conventional automatic lifting magnet crane apparatus.

Explanation of symbols

1-1, 1-2 ... Rail 2 ... Traveler 3 ... Post 4 ... Main beam 5 ... Main lifting magnet (electromagnet)
51 ... Core (magnetic material)
52 ... Excitation coil 53 ... Search coil (magnetic flux detection means)
6 ... Load cell 7 ... Suspension tool 8 ... Mounting member 9 ... Extension beam (extension part)
10 ... Auxiliary lifting magnet 11 ... Elevating device 12 ... Hanger 13 ... Load cell (for auxiliary lifting magnet)
14 ... permanent magnet 15 ... coil _{P, P 1, P 2,} P 3 ... steel PLC ... processing means (sequencer)
REG ... Current supply unit (current supply means)

Claims (3)

  A plurality of electromagnets suspended from a main beam, current supply means for supplying an excitation current to the electromagnet, magnetic flux detection means for detecting a magnetic flux generated by the electromagnet, elevating means for raising and lowering the electromagnet, the excitation current and the In the lifting magnet crane apparatus provided with a processing means for detecting the total thickness of the steel plates adsorbed by the electromagnet by the magnetic flux, an extension is provided in the axial direction of the main beam, and the auxiliary lifting is possible to move up and down in the extension An automatic lifting magnet crane device characterized by providing a magnet.   2. The automatic lifting magnet crane apparatus according to claim 1, wherein the auxiliary lifting magnet is made of a permanent magnet.   3. The automatic lifting magnet crane apparatus according to claim 1, wherein an extension portion is provided so as to be movable back and forth in the axial direction of the main beam.

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