JP3934791B2 - Lifting amount adjustment control device for lifting magnet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a lifting amount adjusting control device for a lifting magnet that accurately adjusts and releases a steel material attracted and adsorbed by a lifting magnet in a steel material transport operation.
[0002]
[Prior art]
Conventionally, as this kind of lifting magnet suspension amount adjustment control device, for example, a circuit configuration as shown in FIG.
[0003]
This suspension adjustment control device includes a commercial three-phase AC power source 1 that supplies power by three-phase AC, and a full-wave rectification type suction thyristor rectifier 2 that forms a multi-phase bridge configuration using a plurality of thyristors (SCRs) as rectifier elements. And a full-wave rectification type release thyristor rectifier 3 having a similar multiphase bridge configuration, an exciting coil wound around a magnetic material, and an applied voltage from the commercial three-phase AC power source 1 is applied. From the release thyristor rectifier 3 to which the exciting coil is excited by the exciting current I ₀ of the output DC voltage V ₀ from the thyristor rectifier 2 for attracting and adsorbing the steel material and the applied voltage from the commercial three-phase AC power source 1 is applied. And a lifting magnet (LM) 10 for releasing the steel material attracted and attracted by the excitation of the exciting coil being attenuated by the exciting current I ₀ of the output DC voltage V ₀ .
[0004]
The suspension amount adjustment control device is composed of a driving operation unit 9 that outputs a driving operation signal of suction, OFF, and release according to a driver's operation, and a control device such as a general relay. Operation command circuit 8 'for converting the control command signal to the operation command signal necessary for control, and the control output voltage (same as the above-described output DC voltage V ₀ ) required for the suction firing command of the lifting magnet 10 according to the operation command signal A suction firing command computation circuit 6 'that computes and outputs a suction control signal to be output, and a control output voltage (the output DC voltage V ₀ described above) required for the release firing command of the lifting magnet 10 according to the operation command signal. The release thyristor rectifier 2 in accordance with the suction control signal from the release firing command computation circuit 6 'and the release firing command computation circuit 7' which computes and outputs the release control signal to be output. In order to output a predetermined output DC voltage V ₀ , a suction firing signal circuit 4 ′ for outputting and outputting a suction firing signal is issued, and a release control signal from the release firing command computing circuit 7. In order to output a predetermined output DC voltage V ₀ from the release thyristor rectifier 3 according to the above, a release ignition signal circuit 5 for outputting and issuing a release ignition signal is provided.
[0005]
Of these, the operating device 9 is installed in the operating room of a machine such as a crane that suspends the lifting magnet 10 to carry it, but outputs a driving operation signal only for suction and release as shown as another example. It is also possible to use the operation controller 9 ′ configured as described above.
[0006]
FIG. 5 is a timing chart showing output waveforms of the control DC voltage (output DC voltage V ₀ ) and current (excitation current I ₀ ) during a series of operations from suction to release in the main part of the hanging amount adjustment control device. It is. However, in the figure, an attraction output period consisting of an overshoot output period T ₁₁ , an overexcitation period T ₁₂ and a rated output period T ₁₃ is T ₁ , an attraction regeneration output period for attenuating the excitation current I ₀ is T ₂ , and a release output period Is T ₃ and the release regeneration output period is T ₄ . The suction regeneration output period T ₂ is set so that the normal excitation current I ₀ is attenuated to zero current within about 1 second, and is quickly released. The release output period T ₃ is used to release the steel material attracted by flowing an exciting current I ₀ in the opposite direction to that of the attracting coil of the lifting magnet 10.
[0007]
Here, in the waveform of the output DC voltage V ₀ , the suction ignition control operation circuit 6 ′ calculates the suction control signal as a result of calculation as the suction firing command in the waveforms of the periods T ₁ and T _2. The three-phase commercial signal is transmitted to the signal circuit 4 'so that the suction ignition signal circuit 4' receives the suction control signal and outputs it to the thyristor elements of the suction thyristor rectifier ₂ as waveforms of periods T ₁ and T _2. An operation and distribution command is issued for a suction ignition signal having a predetermined phase relationship in synchronization with the AC voltage from the AC power source 1, and the release ignition command calculation circuit 7 is released with a waveform of periods T ₃ and T ₄ . The release control signal calculated as the ignition command is transmitted to the release ignition signal circuit 5, and the release ignition signal circuit 5 receives the release control signal and sends a period to each thyristor element of the release thyristor rectifier 3. Commercial output to output as T ₃ and T ₄ waveforms It shows that a release ignition signal having a predetermined phase relationship is commanded to be distributed in synchronization with the AC voltage from the three-phase AC power supply 1.
[0008]
FIG. 6 shows the detailed configuration of the suction firing command calculation circuit 6 ′ including the peripheral portion. Here, the I part indicates a suction command part necessary for the description in the operation command circuit 8 ', the II part indicates a suction circuit necessary for the description of the suction ignition command calculation circuit 6', and III part represents a suction ignition signal circuit 4 'side, IV unit operation command circuit 8' of local and suction firing command calculation circuit for controlling the control output voltage V ₀ which period T ₁₃ in FIG 6 ' The V part indicates the local part of the operation command circuit 8 ′ for controlling the control output voltage V ₀ in the period T _{2 in} FIG. 5 and the local part of the suction firing command calculation circuit 6 ′.
[0009]
Here, in the rated output operation circuit A ₀ of the IV section, after the suction operation by the operation controller 9, the rated output command contact M ₀ is closed by the control step in the control circuit (not shown), and the rated output command signal is output to the rated output. It is transmitted to the command receiving circuit B _0. When the rated output command signal is transmitted to the rated output command receiving circuit B ₀ , the photo moss relay S ₀ is turned on, whereby the next-stage rated output firing command setting circuit C ₀ is activated. In the rated output ignition command setting circuit C ₀ , the suction control obtained by arbitrarily setting the ignition signal level with the rated output ignition signal setting resistor R ₀ within a predetermined threshold range in which an upper limit and a lower limit are determined in advance. The signal C _S is output to the suction firing signal circuit 4 ′ side. At this time, the suction regenerative output circuits A ₁ , B ₁ , C ₁ control the output voltage of the suction control signal C _S as a suction firing command so as to have a waveform of the period T ₂ in the control output voltage V ₀ . To do.
[0010]
In such a hanging amount adjustment control device, as shown in FIG. 7, the steel material 12 is sucked and adsorbed by the lifting magnet 10 in the steel material transporting operation, and then transported to a predetermined position, and then the steel material 12 is released to release the hopper 13. Drop into the inside. In this steel material transporting operation, it is usually required that the steel material 12 is quickly sucked and adsorbed and transported to a predetermined position and then released quickly.
[0011]
By the way, if the steel material 12 is scrap (raw material for making iron), the steel material 12 sucked and adsorbed to the inlet of the hopper 13 needs to be released little by little in addition to quickly performing suction adsorption and release, Alternatively, when the steel material 12 is put into the bucket instead of the hopper 13, it is necessary to put the steel material 12 sucked and adsorbed into the bucket by a specified weight. In such a case, the adjustment release is performed in which the steel material 12 is slightly adjusted and released. Cost.
[0012]
FIG. 8 is a timing chart showing output waveforms of the control DC voltage (output DC voltage V ₀ ) and current (excitation current I ₀ ) during the adjustment release operation in the main part of the hanging amount adjustment control device. This output waveform corresponds to the suction regeneration output period T ₂ in FIG.
[0013]
Here, the operation waveform is an output waveform when the suction and turn-off operations are repeated by the operation controller 9 to decrease the excitation current I ₀ and release the steel material 12 little by little, and the periods T ₁₃ and T _{2 in} FIG. Is repeatedly output. However, as described above, the excitation current I ₀ is quickly attenuated in the period T ₂ as described above, so that skill is required to perform the adjustment release intended by the driver.
[0014]
[Problems to be solved by the invention]
In the case of the lifting magnet adjustment control device described above, when the steel material is transported, when the adjustment release to the steel material sucked and adsorbed is required, the driver performs the operation of repeating the suction and OFF operations with the driver. However, it is difficult to perform the intended adjustment release in practice, and the operation requires considerable skill, and the automatic operation of such adjustment release is impossible with the current system configuration. Since it is near, there is a problem that the adjustment release of the steel material cannot be performed with high accuracy.
[0015]
Therefore, if the steel material is adjusted and released by the existing hanging amount adjustment control device, there is a risk that the operation may be mistaken when the steel material is released into the hopper little by little, or the hopper may be damaged or its outlet may be clogged. Such troubles in driving cannot be avoided.
[0016]
The present invention has been made to solve such problems, and its technical problem is to provide a lifting amount adjustment control device for a lifting magnet that can accurately adjust and release steel materials during steel material transportation work. is there.
[0017]
[Means for Solving the Problems]
According to the present invention, a commercial power source for supplying power, a full-wave rectification type suction thyristor rectifier having a multi-phase bridge configuration with a plurality of thyristors as rectifier elements, and an excitation coil wound around a magnetic material are provided. In addition, a lifting magnet that attracts and attracts steel by exciting the exciting coil by an exciting current from a suction thyristor rectifier to which an applied voltage from a commercial power source is applied, and a driving operation signal for suction according to the driver's operation. Driving controller for outputting, operation command circuit for converting the driving operation signal to an operation command signal necessary for control, and a control signal for suction indicating a control output voltage required for a lifting magnet suction command according to the operation command signal In order to output a predetermined output DC voltage from the suction thyristor rectifier according to the suction control signal A suction ignition signal circuit that outputs a quoted ignition signal as a calculation distribution command, and further, the suction ignition command calculation circuit controls the output voltage of the suction control signal as a predetermined control as a suction ignition command. In a lifting magnet suspension adjustment control device that includes a suction regenerative output circuit that controls the waveform so that the suction regenerative output period is set at the output voltage, the adjustment release that sets the degree of suction in stages according to the driver's operation selection An adjustment release controller that outputs an operation signal is provided. The operation command circuit converts the adjustment release operation signal into an adjustment operation command signal necessary for control. The suction firing command calculation circuit is used for suction according to the adjustment release operation signal. Provided with multiple adjustment suction regenerative output circuits that set and control the output level of each control signal step by step, and the suction ignition signal circuit corresponds to the suction control signal set for each step Calculating distribution amount hanging for lifting magnet variably setting the output level of the suction ignition signal by performing command adjustment control device is obtained.
[0018]
Further, according to the present invention, in the lifting magnet lifting amount adjustment control apparatus, the suction regenerative output circuit is lifted for the lifting magnet that operates when the adjustment release operation device is not operated and when the operation operating device is turned OFF. A quantity adjustment control device is obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the lifting amount adjustment control device for a lifting magnet according to the present invention will be described in detail with reference to the drawings.
[0020]
FIG. 1 is a circuit block diagram showing a basic configuration of a lifting magnet lifting amount adjusting control apparatus according to an embodiment of the present invention.
[0021]
This suspension amount adjusting control device also has a commercial three-phase AC power source 1, a suction thyristor rectifier 2, a release thyristor rectifier 3, a lifting magnet 10 and an operation similar to those of the conventional device shown in FIG. An operation device 9, an operation command circuit 8, a suction firing command calculation circuit 6 ′, a release firing command computation circuit 7, a suction firing signal circuit 4, and a release firing signal circuit 5. In this embodiment, however, an adjustment release operation device 11 is newly provided that outputs an adjustment release operation signal in which the degree of suction is set for each stage in accordance with the driver's operation selection.
[0022]
Further, the operation command circuit 8 here converts the adjusted release operation signal into an adjusted operation command signal necessary for control, and the suction firing command calculation circuit 6 sets the output level of the suction control signal according to the adjusted release operation signal. A plurality of adjustment suction regenerative output circuits that are set and controlled for each stage are provided, and the suction ignition signal circuit 4 outputs a suction ignition signal by issuing a calculation distribution command in accordance with the suction control signals set for each stage. The level is variably set.
[0023]
That is, in the case of this suspension amount adjustment control device, the output level of the suction ignition signal is variably set, so that the adjustment release of the steel material can be increased while changing the exciting current I ₀ of the lifting magnet 10 during the steel material transporting operation. Can be done with precision.
[0024]
FIG. 2 shows a detailed configuration of the suction ignition command calculation circuit 6 of the suspension amount adjustment control device including the peripheral portion. Here, however, the I part indicates a suction command part necessary for the description of the operation command circuit 8, the II part indicates a suction circuit necessary for the description of the suction ignition command calculation circuit 6, and the III part indicates 5 shows the suction ignition signal circuit 4 side, and IV part shows a local part of the operation command circuit 8 for controlling the control output voltage V ₀ in the period T _{13 in} FIG. 5 and a local part of the suction ignition command calculation circuit 6. V indicates a local part of the operation command circuit 8 that controls the control output voltage V ₀ in the period T _{2 in} FIG. 5 and a local part of the suction ignition command calculation circuit 6, and a VI part indicates the period T ₂ in FIG. A local part of the operation command circuit 8 and a local part of the suction firing command calculation circuit 6 which control the control output voltage V ₀ according to the adjusted release operation signal from the adjusted release operation unit 11 are shown.
[0025]
Compared to the configuration shown in FIG. 6, the configuration here is also controlled so that the output voltage of the suction control signal C _S becomes the waveform of the period T ₂ in the control output voltage V ₀ as the suction firing command for the V portion. the suction regeneration output circuit a _1, B _1, C ₁ and equivalent circuit, for adjusting a plurality of (two in this case) to be newly set control the output level of the suction control signal C _S step by step each as part VI The suction regeneration output circuit A ₂ , B ₂ , C ₂ , A ₃ , B ₃ , C ₃ is added.
[0026]
That is, here, the firing signal level set and output from the circuits C ₁ , C ₂ , C ₃ by the operation command or the adjustment operation command for the circuits A ₁ , A ₂ , A ₃ is preliminarily classified at different stages according to the degree of suction. By setting, the output level of the suction control signal C _S is selected and output step by step, and any one of the circuits A ₁ , A ₂ , A ₃ is selected by a setting switch (not shown). As a result, the suction control signal C _S is output according to the output level of any one of the selected circuits C ₁ , C ₂ , C ₃ , and the suction control signal set for each stage on the suction firing signal circuit 4 side. In order to variably set the output level of the suction ignition signal by issuing a calculation distribution command according to C _S , the control output voltage V ₀ in the suction thyristor rectifier 2 and the exciting current I ₀ of the lifting magnet 10 are also changed. As a result, the steel material can be adjusted and released with high accuracy while changing the exciting current I ₀ of the lifting magnet 10 during the steel material transport operation.
[0027]
The suction regenerative output circuits A ₁ , B ₁ , C ₁ of the V section are activated when the adjustment release controller 11 is not operated and when the operation controller 9 is turned OFF. Further, the circuit A ₂ , B ₂ , C ₂ , A ₃ , B ₃ , and C ₃ for adjustment regenerative output in the VI section are connected to the circuits A ₂ , B ₂ , C ₂ and the circuit A by operating the adjustment release controller 11. Any of ₃ , B ₃ and C ₃ is selected and operated.
[0028]
FIG. 3 is a timing chart showing output waveforms of the control DC voltage (output DC voltage V ₀ ) and current (excitation current I ₀ ) during the adjustment release operation in the main part of the hanging amount adjustment control device.
[0029]
Here, when the suction regenerative output circuits A ₁ , B ₁ , C ₁ are activated, the output DC voltage V ₀ becomes the waveform V ₁ , and the exciting current I ₀ of the lifting magnet 10 at that time becomes the waveform I ₁ , and the steel material It shows that it becomes the mode to release quickly. When the adjustment regeneration circuits A ₂ , B ₂ , and C ₂ are operated, the output DC voltage V ₀ becomes the waveform V ₂ , and the exciting current I ₀ of the lifting magnet 10 at that time becomes the waveform I ₂ . This shows that the mode becomes a mode in which the steel material is released slightly more slowly than when the suction regenerative output circuits A ₁ , B ₁ , C ₁ are operated. Further, when the adjustment regenerative output circuits A ₃ , B ₃ , C ₃ are activated, the output DC voltage V ₀ becomes the waveform V ₃ , and the exciting current I ₀ of the lifting magnet 10 at that time becomes the waveform I ₃ , This shows that the mode becomes a mode in which the steel material is released more slowly than when the adjustment suction regenerative output circuits A ₂ , B ₂ and C ₂ are operated.
[0030]
In this way, the adjustment release of the steel material that has been sucked and adsorbed can be adjusted and released in a small amount, but in this process it is also possible to interrupt the adjustment release operation and shift to the suction operation state again. If suction is also used together with the adjustment release, the adjustment release can be performed with higher accuracy depending on the situation.
[0031]
【The invention's effect】
As described above, according to the lifting amount adjustment control device for lifting magnets of the present invention, the steel material is quickly adjusted or released during the steel material transport operation, or in addition to performing it gently, using suction as necessary, etc. Since the adjusted release can be performed accurately according to the situation, when the steel material is released gradually into the container such as hopper or bucket, the operation is caused by the danger of damaging the container or clogging its discharge port. The above trouble can be avoided.
[Brief description of the drawings]
FIG. 1 is a circuit block diagram showing a basic configuration of a lifting amount adjustment control device for a lifting magnet according to an embodiment of the present invention.
FIG. 2 shows a detailed configuration of a suction firing command calculation circuit included in the lifting amount adjusting control device for a lifting magnet shown in FIG. 1 including peripheral portions.
3 is a timing diagram showing output waveforms of a control DC voltage (output DC voltage V ₀ ) and a current (excitation current I ₀ ) at the time of adjustment release in the main part of the lifting amount adjusting control device for lifting magnet shown in FIG. 1; It is a chart.
FIG. 4 is a circuit block diagram showing a basic configuration of a conventional lifting amount adjusting control device for a lifting magnet.
5 is an output of control DC voltage (output DC voltage V ₀ ) and current (excitation current I ₀ ) during a series of operations from suction to release in the main part of the lifting amount adjustment control device for lifting magnet shown in FIG. 4; It is the timing chart which showed the waveform.
6 shows a detailed configuration of a suction ignition command calculation circuit included in the lifting amount adjusting control device for a lifting magnet shown in FIG. 4 including peripheral portions.
FIG. 7 illustrates an example of a steel material transporting operation by a lifting magnet of the lifting amount adjusting control device for a lifting magnet shown in FIG. 4;
8 is a timing diagram showing output waveforms of a control DC voltage (output DC voltage V ₀ ) and a current (excitation current I ₀ ) during an adjustment release operation in the main part of the lifting amount adjustment control device for the lifting magnet shown in FIG. 4; It is a chart.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Commercial 3-phase AC power supply 2 Suction thyristor rectifier 3 Release thyristor rectifier 4, 4 'Suction ignition signal circuit 5 Release ignition signal circuit 6, 6' Suction ignition command calculation circuit 7 Release ignition command Arithmetic circuit 8, 8 'Operation command circuit 9, 9' Driving controller 10 Lifting magnet (LM)
11 Adjusted release controller 12 Steel 13 Hopper

Claims (2)

A commercial power source for supplying power, a full-wave rectification type suction thyristor rectifier having a multi-phase bridge configuration with a plurality of thyristors as rectifier elements, an excitation coil wound around a magnetic material, and the commercial power source A lifting magnet that attracts and attracts steel by exciting the exciting coil with an exciting current from the suction thyristor rectifier to which the applied voltage is applied, and a driving operation that outputs a suction driving operation signal according to the driver's operation An operation command circuit for converting the driving operation signal into an operation command signal necessary for control, and a suction control signal indicating a control output voltage required for the suction firing command of the lifting magnet according to the operation command signal Outputs a predetermined output DC voltage from the suction thyristor rectifier according to the suction control signal and the suction control signal for calculation output A suction firing signal circuit for outputting and outputting a suction firing signal, and further, the suction firing command computing circuit is configured to output the suction control signal as a suction firing command. In the lifting amount adjustment control device for a lifting magnet including a suction regenerative output circuit for controlling the output voltage so as to have a waveform of the suction regenerative output period at the predetermined control output voltage, the degree of suction according to the driver's operation selection An adjustment release operation device that outputs an adjustment release operation signal that is set for each stage, and the operation command circuit converts the adjustment release operation signal into an adjustment operation command signal necessary for control, and calculates the suction firing command calculation. The circuit includes a plurality of adjustment suction regenerative output circuits for setting and controlling the output level of the suction control signal in stages according to the adjustment release operation signal, and the suction ignition signal Circuit includes a variable set hanging amount adjusting control device for a lifting magnet, characterized in that the output level of the suction ignition signal by performing the calculation dispensing command depending on the suction control signal set in tiered. 2. The lifting amount adjusting control device for a footing magnet according to claim 1, wherein the suction regenerative output circuit operates when the adjustment release operation device is not operated and when the operation operation device is turned OFF. Lifting amount adjustment control device for lifting magnet.

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