JP2008230725A - Lifting magnet control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting magnet control system capable of efficiently adjusting the power to be supplied to a lifting magnet by an operator. <P>SOLUTION: The lifting magnet control system 2 comprises a magnet control device (a magnet control panel) 3 including a magnet driving circuit 31 for supplying the power to a lifting magnet 10 and a control unit 33 for controlling at least one of the current and the voltage in the power, and an input device 4 which is arranged in a part different from that of the magnet control device 3, receives the input from an operator engaged in at least one of the current and the voltage in the power, and provides the input to the control unit 33. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lifting magnet control system.

Generally, a lifting magnet for lifting an iron piece in cargo handling work or construction work is known. As a lifting magnet, in addition to what is installed in a factory or the like, there are some that are mounted on a vehicle. When using a lifting magnet, an electric current is passed in a certain direction to excite the lifting magnet to attract and lift the iron piece. When releasing the iron piece, the lifting magnet is demagnetized by passing a current in the opposite direction. Patent Document 1 describes a control device that supplies such a current for excitation and release to a lifting magnet. Patent Document 2 discloses a configuration in which the control device is disposed inside a lifting magnet body.
Japanese Patent Laid-Open No. 6-183681 Japanese Patent Laid-Open No. 2001-240359

  A control device that supplies an exciting current and a releasing current to a lifting magnet is often installed away from the position of the person who operates the lifting magnet. That is, the control device is arranged in the lifting magnet body as in the configuration shown in Patent Document 2, or is arranged behind or on the side of the driver's seat in a vehicle such as a hydraulic excavator. In such a case, the operator turns on / off the excitation current and the release current by operating a hand switch connected to the control device.

  However, the magnitudes of the excitation current (or excitation voltage) and release current vary greatly depending on the size of the lifting magnet (suspending ability) and the type of suspended load. Therefore, when changing the size of the lifting magnet or the type of the suspended load, the operator moves from the driver's seat to the vicinity of the control device in order to adjust the magnitude of the excitation current, release current, etc. (Variable resistance etc.) had to be adjusted, which was inefficient. In addition, when adjusting the magnetic force of the lifting magnet, etc., the exciting current and exciting voltage are adjusted while attracting the suspended load to the lifting magnet. A person who adjusted the device was required, which was also inefficient.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a lifting magnet control system in which an operator can efficiently adjust the magnitude of electric power supplied to a lifting magnet.

  In order to solve the above-described problems, a lifting magnet control system according to the present invention includes a magnet drive circuit that supplies power to a lifting magnet, and a magnet control device that includes a control unit that controls at least one of current and voltage in the power. And an input device that is arranged at a location different from the magnet control device, receives an input from an operator related to at least one of a current and a voltage in the electric power, and provides the input to the control unit.

  In this lifting magnet control system, an operator can adjust power (at least one of current and voltage) by an input device arranged at a location different from the magnet control device. Therefore, for example, by placing this input device in the driver's seat, etc., when changing the magnet size or the type of suspended load, the operator adjusts the magnitude of the excitation current or release current without leaving the driver's seat. It becomes possible to do. Therefore, according to the lifting magnet control system, the operator can efficiently adjust the magnitude of the excitation power and the release current.

  Further, in the lifting magnet control system, the magnet drive circuit has an H-bridge circuit unit, and the H-bridge circuit unit includes a plurality of transistors, and controls the direction of current to the lifting magnet. A digital arithmetic processing circuit that controls the duty ratio of the control voltage to the plurality of transistors according to the input provided from the input device may be included. Thereby, the control part can control suitably the electric power (voltage, electric current) to a lifting magnet.

  In addition, the lifting magnet control system has a release current setting mode in which the input device allows the operator to input a set value of the release current to the lifting magnet, and the magnet drive circuit measures the magnitude of the release current. A current measuring unit may be included, and the control unit may stop supplying the release current when an output signal from the current measuring unit reaches a value corresponding to a set value. Thereby, the operator can suitably adjust the magnitude of the release current using the input device.

  The lifting magnet control system has a magnetic force setting mode for the operator to input one or both of set values of the excitation current and the excitation voltage to the lifting magnet, and the control unit sets the set value. One or both of the excitation current and the excitation voltage may be controlled based on the above. Thereby, the operator can suitably adjust the magnitude of the magnetic force using the input device, and can easily adjust the magnetic force while adsorbing the suspended load.

  In addition, the lifting magnet control system has a magnet size selection mode in which the input device inputs the size of the lifting magnet by the operator, and the control unit is excited based on the size of the lifting magnet input to the input device. It may be characterized by controlling at least one of current, excitation voltage, and release current. Thus, the operator can save the trouble of individually setting the excitation current, excitation voltage, and release current according to the size of the lifting magnet to be used, and can more efficiently adjust the magnitude of the excitation power and release current.

  The lifting magnet control system may be characterized in that the input device has a touch panel for inputting and displaying set values. As a result, the operator can easily perform the input work.

  Further, the lifting magnet control system may be characterized in that each of the magnet control device and the input device has a serial communication circuit for transmitting an input from the operator. Thereby, the input information from the operator can be reliably exchanged with a small number of wires between the magnet control device and the input device arranged at different locations.

  According to the lifting magnet control system of the present invention, the operator can efficiently adjust the magnitude of the electric power supplied to the lifting magnet.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a lifting magnet control system according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing a configuration of a lifting magnet vehicle 1 that is a work machine as an example of a mounting target of the lifting magnet control system according to the present embodiment. As shown in FIG. 1, a lifting magnet vehicle 1 is configured by mounting a lifting magnet 10 that attracts and captures a suspended load G such as a steel material by a magnetic force at the tip of an arm 12 of a hydraulic excavator (base machine). Yes. The lifting magnet vehicle 1 also includes a cab 14 for accommodating an operator who operates the position of the lifting magnet 10 and the excitation operation and release operation.

  The lifting magnet control system mounted on the lifting magnet vehicle 1 is configured so that an operator performs settings relating to a magnet control device (magnet control panel) 3 that supplies power to the lifting magnet 10 and at least one of current and voltage in the power. Input device 4. The magnet control device 3 and the input device 4 are arranged at different locations in the lifting magnet vehicle 1. In this embodiment, the magnet control device 3 is installed outside the cab 14, and the input device 4 is the cab. 14 is installed inside.

  FIG. 2 is a block diagram showing a configuration of the lifting magnet control system 2 mounted on the lifting magnet vehicle 1 shown in FIG. As shown in FIG. 2, the lifting magnet control system 2 includes a magnet control device 3, an input device 4, and a magnet operation unit 5.

  The magnet control device 3 has a magnet drive circuit 31, a bridge driver 32, a control unit 33, and a serial communication circuit 34. The magnet drive circuit 31 is a circuit that supplies power to the lifting magnet 10, and includes an H-bridge circuit that controls the direction of the current flowing through the lifting magnet 10. The bridge driver 32 is a circuit that drives the H bridge circuit. The control unit 33 controls at least one of a current and a voltage in the power supplied to the lifting magnet 10 via the bridge driver 32. The control unit 33 includes, for example, a digital arithmetic processing circuit including a memory that stores a predetermined program and a CPU that reads and executes the predetermined program, and controls the bridge driver 32 according to setting input information D1 described later. To do. The serial communication circuit 34 is connected to the serial communication circuit 43 of the input device 4 via the wiring 16 that connects the inside and outside of the cab 14 (see FIG. 1). Is sent to the control unit 33. The magnet drive circuit 31, the bridge driver 32, the control unit 33, and the serial communication circuit 34 are accommodated in one housing (magnet control panel 3).

  The input device 4 includes a touch panel 41, a signal processing unit 42, and a serial communication circuit 43. The touch panel 41 receives a setting input related to at least one of a current and a voltage in the power supplied to the lifting magnet 10 from an operator and displays a current setting state. The signal processing unit 42 recognizes the setting information input to the touch panel 41 and provides the setting information to the control unit 33 of the magnet control device 3 via the serial communication circuits 43 and 34. Further, the signal processing unit 42 stores the current setting information and displays it on the touch panel 41. The signal processing unit 42 and the serial communication circuit 43 are accommodated in one housing (input device 4) including the touch panel 41.

  The magnet operation unit 5 is a device for an operator to operate the excitation operation and the release operation of the lifting magnet 10, and is arranged together with the input device 4 inside the cab 14 shown in FIG. 1. The magnet operation unit 5 has two switches 51 and 52. One terminal of each of the switches 51 and 52 is connected to each other and is connected to the control unit 33 via the wiring 53 and is connected to a constant potential line inside the control unit 33. The other terminals of the switches 51 and 52 are connected to the control unit 33 via wirings 54 and 55, respectively.

  For example, when the operator presses the switch 51, a predetermined potential is transmitted to the control unit 33 via the wiring 54, and the control unit 33 controls the bridge driver 32 so that a positive direction current (excitation current) is supplied to the lifting magnet 10. To do. When the operator presses the switch 52, a predetermined potential is transmitted to the control unit 33 via the wiring 55, and the control unit 33 controls the bridge driver 32 so that a reverse current (release current) is supplied to the lifting magnet 10. Control. Alternatively, the controller 33 recognizes only the potential of the wiring 54, and when the switch 51 is pressed once, the exciting current is supplied to the lifting magnet 10, and when the switch 51 is pressed again, the release current is supplied to the lifting magnet 10. May be.

  FIG. 3 is a circuit diagram showing a configuration of the magnet drive circuit 31. As shown in FIG. 3, the magnet drive circuit 31 includes a DC conversion unit 36, an H bridge circuit unit 37, a capacitor 38, and a current measurement unit 39.

The DC converter 36 is a circuit part for converting the AC power supply voltages V _{AC1 to} V _AC3 supplied from the three-phase AC power supply ACG into the DC power supply voltage V _DC . The DC conversion unit 36 of the present embodiment is configured by a bridge circuit including six diodes 36a to 36f, and performs three-phase full-wave rectification. In addition, the DC conversion unit may be configured by, for example, a pure bridge circuit using a thyristor or a mixed bridge circuit using a diode and a thyristor. In the case where the DC conversion unit is configured by a pure bridge circuit or a mixed bridge circuit, the thyristor is phase-controlled at a predetermined control angle by a phase control circuit (not shown).

  The H bridge circuit unit 37 is a circuit part for controlling the direction of the current supplied to the lifting magnet 10. The H-bridge circuit unit 37 includes four npn transistors 37a to 37d and four diodes electrically connected between current terminals (collector-emitter or source-drain) of the four transistors 37a to 37d. (Rectifier elements) 37e to 37h and an H bridge circuit including terminals 37i and 37j to which wirings 18a and 18b for supplying current to the lifting magnet 10 are connected.

  Specifically, one current terminal of the transistor 37a is electrically connected to the positive output terminal 36g of the DC converter 36, and the other current terminal of the transistor 37a is electrically connected to the terminal 37i. . One current terminal of the transistor 37 b is electrically connected to the terminal 37 i, and the other current terminal of the transistor 37 b is electrically connected to the negative output terminal 36 h of the DC conversion unit 36. One current terminal of the transistor 37c is electrically connected to the positive output terminal 36g of the DC converter 36, and the other current terminal of the transistor 37c is electrically connected to the terminal 37j. One current terminal of the transistor 37d is electrically connected to the terminal 37j, and the other current terminal of the transistor 37d is electrically connected to the negative output terminal 36h of the DC converter 36. The anodes of the diodes 37e to 37h are electrically connected to the other current terminals of the transistors 37a to 37d, respectively. The cathodes of the diodes 37e to 37h are electrically connected to the one current terminals of the transistors 37a to 37d, respectively. It is connected to the.

The control terminals (bases or gates) of the transistors 37a to 37d are electrically connected to the bridge driver 32, and the conduction state between the current terminals of the transistors 37a to 37d is a control current (from the bridge driver 32). Or control voltage). For example, when the control current to the control terminal of the transistor 37a and 37d are provided, the exciting current _{I 1} in the positive direction flows transistor 37a, the terminal 37i, the lifting magnet 10, the terminal 37j, and the order of the transistor 37d. Further, when the control current to the control terminal of the transistor 37b and 37c are provided, reverse release current (demagnetizing current) _{I 2} is, transistor 37c, the terminal 37j, the lifting magnet 10, the terminal 37i, and the order of the transistor 37b ( That is, a reverse direction) flows through the excitation current I _1.

  The bridge driver 32 makes any of the transistors 37 a to 37 d conductive according to the output signal of the control unit 33. The control unit 33 determines which of the transistors 37a to 37d is to be conducted based on the signal provided from the magnet operation unit 5 illustrated in FIG. Further, the bridge driver 32 intermittently turns on the transistors 37a to 37d as necessary, and adjusts the voltage supplied to the lifting magnet 10 by pulse width modulation (PWM). The PWM pulse width is controlled by the control unit 33, and the control unit 33 determines the PWM pulse width based on the set input information D1 from the input device 4 (see FIG. 2).

The capacitor 38 is provided to absorb and regenerate the energy accumulated in the lifting magnet 10 when the exciting current I ₁ to the lifting magnet 10 is switched to the release current I ₂ . The capacitor 38 is electrically connected between the positive output terminal 36g and the negative output terminal 36h of the DC converter 36. Instead of the capacitor 38 or in parallel with the capacitor 38, an energy discharging resistor 61 may be provided. In this case, it is more preferable to provide a switch means 62 such as a transistor in series with the resistor 61.

The current measuring unit 39 is a circuit part for measuring the magnitude of the current flowing through the lifting magnet 10. The current measuring unit 39 according to the present embodiment includes a shunt resistor 39a provided in series with the wiring 18b, and outputs the voltage across the shunt resistor 39a to the A / D converter 39b. The A / D converter 39 b converts the voltage value at both ends into a digital signal and provides the digital signal to the control unit 33. Control unit 33, for example, when released current I ₂ of the process such that end the release operation upon reaching a predetermined value, referring to the digital signal. The current measuring unit may have a current sensor instead of the shunt resistor 39a.

Next, operations (excitation operation and release operation) of the magnet control device (magnet control panel) 3 will be described. FIGS. 4A and 4B show time waveforms of the voltage applied to both ends of the lifting magnet 10 (FIG. 4A) and the current supplied to the lifting magnet 10 (FIG. 4B), respectively. It is a graph which shows. Note that, as described above, the voltage applied to the lifting magnet 10 is adjusted by PWM, but FIG. 4A shows the value of the effective voltage obtained by averaging the voltage change in PWM over time. . Further, FIG. 4 (a), the the sign of the voltage and current in (b) is in the direction of the excitation current I ₁ shown in FIG. 3 as positive.

First, at a certain time t ₀ , the three-phase AC power supply ACG is driven to provide the DC converter 36 with the three-phase AC power supply voltages V _{AC1 to} V _AC3 . The AC power supply voltages V _{AC1 to} V _AC3 are converted into the DC power supply voltage V _DC by the DC conversion unit 36. Subsequently, when the operator presses the switch 51 (or 52) of the magnet operation unit 5 (time t ₁ ), the control unit 33 starts exciting the lifting magnet 10. In other words, the bridge driver 32 that has received an instruction from the control unit 33 causes the transistors 37 a and 37 d of the H bridge circuit unit 37 to conduct. As a result, the exciting current I ₁ flows through the lifting magnet 10.

Control unit 33, in the first period _{T 1,} the excitation voltage the duty ratio of the PWM to 100% of the maximum rms and maximum value _{V OS.} The period T ₁ called overshoot period (OS period) is a period for starting up the exciting current I ₁ to the lifting magnet 10 in a short time. In addition, in the period T ₂ following the period T ₁ , the control unit 33 reduces the PWM duty ratio from the maximum (for example, 90%) and sets the excitation voltage (effective value) to V _OE (<V _OS ). . The period T ₂ designated as over-excited period (OE period) is a period during which temporarily increase the force of the lifting magnet 10 so that the suspended load can be easily captured. The control unit 33, in the next period _{T 3} period _{T 2,} and further reduce the duty ratio of the PWM, and the excitation voltage (effective value) _V RA _{(<V OE).} It referred to the period T ₃ the rated exciting period, a period for maintaining the excited state while supplying power near rated power of the lifting magnet 10. Incidentally, the rated exciting period T ₃ is continued until the process proceeds to the next release operation.

  By supplying such excitation power to the lifting magnet 10, the lifting magnet 10 is excited, and it becomes possible to attract and lift a suspended load such as an iron piece.

Subsequently, the operation proceeds to release (release) the iron pieces from the lifting magnet 10. When the operator presses the other switch 52 (or 51) of the magnet operation unit 5 (time t ₂ ), the control unit 33 starts demagnetization of the lifting magnet 10. That is, the bridge driver 32 that has received an instruction from the control unit 33 turns off the transistors 37a and 37d of the H bridge circuit unit 37 and turns on the transistors 37b and 37c. As a result, the direction of the current of the lifting magnet 10 is reversed, and the release current I ₂ flows (period T ₄ ). The release current I ₂ approaches a predetermined value with a certain time constant due to the influence of the inductance of the lifting magnet 10. Thereby, the lifting magnet 10 and the suspended load are demagnetized, and the suspended load is released. When the magnitude of the release current I ₂ reaches the set value I _LM (set and input by the operator in the input device 4), the control unit 33 turns off the transistors 37b and 37c of the H bridge circuit unit 37 and after the transistors 37a and 37d for the regeneration is made conductive for a certain time (time _T 5), and stops power supply to all of the transistors 37a~37d made nonconductive.

  Next, the operation of the input device 4 will be described. 5 to 8 are diagrams showing a hierarchical structure of display screens on the touch panel 41 of the input device 4. Moreover, FIGS. 9-16 is a figure which shows the example of the display screen in each hierarchy.

  As shown in FIG. 5, the touch panel 41 first displays a startup screen 101 (FIG. 9A) immediately after the power is turned on. Then, the touch panel 41 automatically displays the startup screen 102 (the startup screen 102A in FIG. 9B or the startup screen 102B in FIG. 9C). When the operator touches the panel 102 s (“magnet”) of the startup screens 102 </ b> A and 102 </ b> B shown in FIGS. 9B and 9C, the touch panel 41 displays the operation screen 103. The operation screen 103 changes according to the state of the magnet operation unit 5, and when neither the excitation operation nor the release operation is performed, the standby screen 103A shown in FIG. 9 (d) or the standby shown in FIG. 9 (e). The screen 103B is displayed, while the excitation operation is being executed, the suction screen 103C shown in FIG. 9 (f) or the suction screen 103D shown in FIG. 10 (a) is displayed, and while the release operation is being executed, FIG. 10 (b) is displayed. The releasing screen 103E shown in FIG. 10 or the releasing screen 103F shown in FIG. 10C is displayed. In the standby screen 103A, the operator touches the panel 103u (“release adjustment”) or the operator adjusts the magnitude of the release current by operating an adjustment knob provided outside the touch panel 41. it can. In the during-attraction screen 103C, the operator touches the panel 103v (“magnetic force adjustment”), or the operator operates an adjustment knob provided outside the touch panel 41, so that the magnitude of the excitation current is increased. Can be adjusted.

  When the operator touches the panel 103s ("extinguish") of the standby screens 103A and 103B shown in FIGS. 9D and 9E, the touch panel 41 displays the extinguished screen 104 (FIG. 10D). When the operator touches the panel 104s ("lit") of the unlit screen 104, the touch panel 41 displays the standby screen 103A (FIG. 9 (d)) or the standby screen 103B (FIG. 9 (e)).

  If an abnormality occurs in the lifting magnet control system 2 while the operation screen 103 is displayed, the controller 33 of the magnet control device 3 detects the abnormality and sends information related to the abnormality to the input device 4. At this time, the touch panel 41 first displays a caution screen 105 (FIG. 10E). The failure items displayed on the caution screen 105 include, for example, a generator rotation decrease, magnet current excess, magnet voltage increase, magnet overheating, control panel (magnet control panel 3) overheating, and battery voltage decrease (short circuit). . At this time, the input device 4 may sound a buzzer at the same time to notify the operator of the abnormality.

  Further, when the lifting magnet control system 2 is stopped due to an abnormality, the touch panel 41 displays a warning screen 106 (FIG. 10 (f)). The failure items displayed on the warning screen 106 are the same as those on the caution screen 105 (FIG. 10E). Further, when the operator touches the panel 106s (“details”) of the warning screen 106, the touch panel 41 displays the warning details screen 107 to display the cause of the stop, and provides information that allows quick repair and recovery. The warning detail screen 107 differs depending on the type of abnormality. When the generator rotation is reduced, the warning detail screen 107A shown in FIG. 11A, and when the magnet current is exceeded, the warning detail screen 107B shown in FIG. When the magnet voltage rises, the warning detail screen 107C shown in FIG. 11C, when the control panel (magnet control device 3) is overheated, the warning detail screen 107D shown in FIG. 11D, the battery voltage drop (short circuit) In this case, a warning detail screen 107E shown in FIG. When the operator touches the panel 107s (“previous item”) on each of the warning detail screens 107A to 107E, the touch panel 41 displays the warning screen 106 (FIG. 10F) again. When the operator touches the warning screen 106 and the panels 106u and 107u (“Reset”) of the warning details screens 107A to 107E, the touch panel 41 is displayed on the startup screen 102A (FIG. 9B) or 102B (FIG. 9C). )) Again.

  When the operator touches the panel 103t (“service mode”) on the standby screens 103A and 103B shown in FIGS. 9D and 9E, the touch panel 41 displays the service menu screen 108 (FIG. 6) as shown in FIG. 11 (f)) is displayed. When the operator touches each of the panel 108s (“monitoring”), the panel 108t (“caution failure”), and the panel 108u (“warning failure”) on the service menu screen 108, the touch panel 41 displays the monitoring all display screen. 109 (FIG. 12A), a caution failure history screen 110 (FIG. 12B), and a warning failure history screen 111 (FIG. 12C) are displayed. The monitoring all display screen 109 displays, for example, the current generator speed, generator voltage, magnet voltage, magnet current, and the like. The attention failure history screen 110 displays the time when attention occurred in the past, the type of attention, and the like. The warning failure history screen 111 displays the time when warnings occurred in the past, the type of warning, and the like. When the operator touches the panels 109s, 110s, and 111s (“previous item”) of the entire monitoring display screen 109, the attention failure history screen 110, and the warning failure history screen 111, the touch panel 41 displays the service menu screen 108 (FIG. 11). (F)) is displayed again.

  When the operator touches the two panels 108v in order on the service menu screen 108, a panel 108w (“maintenance”) is displayed. When the operator touches the panel 108w (“Maintenance”), the touch panel 41 displays the password screen 112 (FIG. 12D). If the password input by the operator does not match the predetermined password, the touch panel 41 displays the service menu screen 108 again. When the password input by the operator matches the predetermined password, the touch panel 41 displays a maintenance menu screen 113 (FIG. 12E) as shown in FIG.

  When the operator touches each of the panel 113s (“monitoring”), the panel 113t (“counter”), the panel 113u (“discharge”), and the panel 113v (“driving”) on the maintenance menu screen 113, the touch panel 41 is touched. Are a monitoring screen 114 (FIG. 12F), a counter hour meter screen 115 (FIG. 13C), a capacitor discharge screen 117 (screen example omitted), and an operation pattern selection screen 119 (screen example omitted). Display each one.

  When the operator touches each of the item selection panels 114s to 114w (“generator speed”, “generator voltage”, “magnet voltage”, “magnet current”, and “all display”) of the monitoring screen 114, a touch panel is displayed. Reference numeral 41 denotes a generator rotational speed graph display screen 114A (FIG. 13A), a generator voltage graph display screen 114B, a magnet voltage graph display screen 114C, and a magnet current graph display screen 114D (all the same as FIG. 13A). ) And a corresponding screen among all display screens 114E (FIG. 13B). The counter hour meter screen 115 displays the usage time and number of suctions of the lifting magnet 10. When the operator touches the panel 115 s (“suction frequency reset”) on the counter / hour meter screen 115, the touch panel 41 confirms whether or not the counter is reset on the counter reset screen 116, and then the suction frequency is reset. On the capacitor discharge screen 117, the operator inputs whether or not to discharge the electric charge stored in the capacitor 38 (see FIG. 3) of the magnet drive circuit 31. When the operator selects to discharge the charge, the touch panel 41 displays a capacitor discharge completion screen 118 (screen example is omitted). On the operation pattern selection screen 119, the operator selects one of a plurality of operation patterns in accordance with the work environment at the site.

  In addition, when the operator touches the panel 113w (“Setting”) on the maintenance menu screen 113 (FIG. 12E), the touch panel 41 displays the setting menu screen 120 (FIG. 13D) as shown in FIG. , 121 (FIG. 13 (e)). The setting menu screen 120 and the setting menu screen 121 are paired. When the operator touches the panel 120s (“>>”) and the panel 121s (“<<”) on each screen, the other setting menu screen is displayed. Is displayed.

  When the operator touches panel 120t (“basic”) on setting menu screen 120, touch panel 41 displays basic setting menu screen 122 (FIG. 13F). When the operator touches the panel 122s (“manual setting”) on the basic setting menu screen 122, the touch panel 41 displays the manual setting screen 123. The manual setting screen 123 includes a plurality of screens, and various numerical values can be freely set by the operator using the numeric keypad screen 131. For example, the current amount and the length of the OS period are set on the manual setting screen 123A shown in FIG. 14A, and the voltage of the OE period and the length of the OE period are set on the manual setting screen 123B shown in FIG. The voltage and current of the rated excitation period are set on the manual setting screen 123C shown in FIG. 14C, and the release current is set on the manual setting screen 123D shown in FIG.

  The voltage setting during the OE period on the manual setting screen 123B and the voltage and current setting during the rated excitation period on the manual setting screen 123C are examples of the magnetic force setting mode in the input device 4. That is, in this magnetic force setting mode, the operator inputs one or both set values of the excitation current and the excitation voltage to the lifting magnet 10. When the control unit 33 receives information about the set value from the input device 4, the control unit 33 controls the excitation current and the excitation voltage by adjusting the duty ratio of the bridge driver 32 according to the set value.

The setting of the release current on the manual setting screen 123D is an example of a release current setting mode in the input device 4. That is, in this release current setting mode, the operator inputs a set value I _LM (see FIG. 4B) of the release current I ₂ to the lifting magnet 10. The control unit 33 receives information on the set value I _LM from the input device 4, and when the output signal from the current measuring unit 39 shown in FIG. 3 reaches a value corresponding to the set value I _LM , the release current I _2. The bridge driver 32 is controlled so that the supply of is stopped. In general, the larger the suspended load, the larger the release current I ₂ is required.

  When the operator touches panel 122t (“generator selection”) on basic setting menu screen 122 (FIG. 13F), touch panel 41 displays generator selection screen 124 (FIG. 14E). On the generator selection screen 124, the operator selects the type of generator to be combined. On the basic setting menu screen 122, when the operator touches the panel 122u (“standard setting”), the touch panel 41 displays the standard setting screen 125 (FIG. 14F). On the standard setting screen 125, the operator selects the size (rated power, etc.) of the lifting magnet 10 to be used (magnet size selection mode).

The standard setting screen 125 is an example of a magnet size selection mode in the input device 4. In this magnet size selection mode, the control unit 33 that has received selection information regarding the size of the lifting magnet 10 determines the excitation current I ₁ and the excitation voltage ( _VOE or V _{RA in} FIG. 4A) based on the size. ), and controls at least one of the release current I _2. Here, FIG. 17 is a diagram illustrating an example of a table stored in the control unit 33. As shown in FIG. 17, the table 33a includes the excitation current I ₁ (rated current) and the excitation voltage V _RA (rated voltage), the length of the OS period T ₁ and the OE period T ₂ , and the OS period during the rated excitation period T _3. Excitation current I ₁ (OS current) of T ₁ , excitation voltage V _OE (OE voltage) of OE period T ₂ , overcurrent set value, and release current I ₂ are stored for each dimension (diameter) of the lifting magnet 10. is doing. When the control unit 33 receives selection information regarding the size of the lifting magnet 10 from the input device 4, the control unit 33 determines the duty ratio of the bridge driver 32 according to these numerical values corresponding to the size. Each item such as the rated current in the table 33a is an example, and any item may be missing, or a new item may be added.

  When the operator touches the panel 122v (“setting status”) on the basic setting menu screen 122 (FIG. 13F), the touch panel 41 displays a setting status confirmation screen 126. The display contents of the setting status confirmation screen 126 are the same as those of the manual setting screens 123A to 123D shown in FIGS.

  In the setting menu screen 120 (FIG. 13D), the operator is assigned to each of the panel 120u (“operation”), the panel 120v (“language”), the panel 120w (“maintenance”), and the panel 120x (“clock”). Touches the operation setting screen 127 (FIG. 15A), the language setting screen 128 (FIG. 15B), the maintenance screen 129 (FIG. 15C), and the clock setting screen 130 (screen). Each example is displayed. On the operation setting screen 127, an operator's preferred operation method can be selected from a plurality of operation methods. On the language setting screen 128, when the operator selects one language from a plurality of languages (for example, Japanese, English, and Chinese), the display on the touch panel 41 is switched to the language. On the maintenance screen 129, the operator can operate suction / release of the lifting magnet 10 using the touch panel 41. On the clock setting screen 130, the operator sets the current time using the numeric keypad 131.

  In the setting menu screen 121 (FIG. 13 (e)), the panel 121t (“display”), the panel 121u (“sound”), the panel 121v (“release”), the panel 121w (“activation”), and the panel 121x (“ When the operator touches each of “warning release”), the touch panel 41 displays the display setting screen 132 (FIG. 15D), the sound setting screen 133 (FIG. 15E), and the release setting screen 135 (FIG. 15F). )), An activation setting screen 136 (FIG. 16A), and an alarm cancellation screen 137 (FIG. 16B). On the display setting screen 132, the operator can select a display method of the touch panel 41 such as animation or normal display. On the sound setting screen 133, the type of buzzer can be selected according to the operator's preference, and the sound of the selected buzzer can be confirmed on the sound setting confirmation screen 134 (screen example is omitted). On the release setting screen 135, the operator can select either the method using the touch panel 41 or the method using the adjustment knob as the method for adjusting the release current. On the startup setting screen 136 (screen example is omitted), the operator determines which of the startup screen 102A shown in FIG. 9B and the startup screen 102B shown in FIG. You can choose. In the alarm release screen 137, the operator can select the content of the caution so that the caution screen 105 displays only the necessary caution information. The selected caution content can be confirmed on the alarm cancellation confirmation screen 138 (FIG. 16C).

  In each of the screens shown above, when the operator touches the panel (“END”), the touch panel 41 displays the startup screen 102 (FIG. 5).

The effect which the lifting magnet control system 2 by this embodiment demonstrated above has is demonstrated. In the lifting magnet control system 2, the operator can adjust the magnet power (excitation current I ₁ , release current I ₂ , and excitation voltage) by the input device 4 arranged at a location different from the magnet control device 3. Therefore, for example, when the size of the lifting magnet 10 or the type of the suspended load is changed by arranging the input device 4 in the driver's seat or the like, the operator himself / herself does not leave the driver's seat and the exciting current I ₁ or the release current. It is possible to adjust the size of I ₂ or the like by remote control. Therefore, according to the lifting magnet control system 2, the operator the magnitude of the excitation current I ₁ and the release current I ₂ can be efficiently adjusted. Further, it is possible to easily adjust the magnetic force while adsorbing the suspended load.

Further, as in the present embodiment, the input device 4 has a magnet size selection mode, and the control unit 33 determines the excitation current I ₁ , the excitation voltage, and the like based on the size of the lifting magnet 10 input to the input device 4. And the release current I ₂ is preferably controlled. Thus, the operator, exciting the currents I ₁ and the excitation voltage in accordance with the magnitude of the lifting magnet 10 to be used, eliminates the need for setting the release current I ₂ individually, more efficient the magnitude of the excitation power and release current Can be adjusted.

  Moreover, it is preferable that the input device 4 has the touch panel 41 which inputs and displays a set value like this embodiment. As a result, the operator can easily perform the input work.

  Further, as in the present embodiment, each of the magnet control device 3 and the input device 4 preferably has serial communication circuits 34 and 43 for transmitting setting input information from the operator. Thereby, setting input information from the operator can be reliably exchanged with a small number of wires between the magnet control device 3 and the input device 4 arranged at different locations.

  The lifting magnet control system according to the present invention is not limited to the above-described embodiment, and various other modifications are possible. For example, although a wired serial communication circuit is illustrated as a communication means between the input device and the magnet control device in the above embodiment, the communication means may be wireless or an analog signal line indicating transmission information in voltage or the like. In addition to the touch panel described above, various means such as an adjustment knob, a switch, or a memory card reading device storing each set value can be applied as the input device.

It is a perspective view which shows the structure of the lifting magnet vehicle which is a working machine as an example of the mounting object of a lifting magnet control system. It is a block diagram which shows the structure of the lifting magnet control system mounted in the lifting magnet vehicle shown in FIG. It is a circuit diagram which shows the structure of a magnet drive circuit. (A) It is a graph which shows the time waveform of the voltage applied to the both ends of a lifting magnet. (B) It is a graph which shows the time waveform of the electric current supplied to a lifting magnet. It is a figure which shows the hierarchical structure of the display screen in the touchscreen of an input device. It is a figure which shows the hierarchical structure of the display screen in the touchscreen of an input device. It is a figure which shows the hierarchical structure of the display screen in the touchscreen of an input device. It is a figure which shows the hierarchical structure of the display screen in the touchscreen of an input device. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(f) It is a figure which shows the example of the display screen in each hierarchy. (A)-(c) It is a figure which shows the example of the display screen in each hierarchy. It is a figure which shows an example of the table which the control part has memorize | stored.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lifting magnet vehicle, 2 ... Lifting magnet control system, 3 ... Magnet control apparatus (magnet control panel), 4 ... Input device, 5 ... Magnet operation part, 10 ... Lifting magnet, 12 ... Arm, 14 ... Driver's cab, 31 DESCRIPTION OF SYMBOLS ... Magnet drive circuit, 32 ... Bridge driver, 33 ... Control part, 34, 43 ... Serial communication circuit, 36 ... DC conversion part, 37 ... Bridge circuit part, 39 ... Current measurement part, 41 ... Touch panel, 42 ... Signal processing part , ACG: three-phase AC power supply, G: suspended load, I ₁ ... excitation current, I ₂ ... release current.

Claims (7)

A magnet drive circuit that supplies power to the lifting magnet, and a magnet control device that includes a control unit that controls at least one of a current and a voltage in the power; and
An input device that is disposed at a different location from the magnet control device, receives an input from an operator related to at least one of a current and a voltage in the electric power, and provides the input to the control unit. , Lifting magnet control system. The magnet drive circuit has an H-bridge circuit section, and the H-bridge circuit section includes a plurality of transistors, and controls the direction of the current to the lifting magnet.
2. The lifting according to claim 1, wherein the control unit includes a digital arithmetic processing circuit that controls a duty ratio of a control voltage to the plurality of transistors in accordance with the input provided from the input device. Magnet control system. The input device has a release current setting mode for the operator to input a set value of a release current to the lifting magnet,
The magnet drive circuit has a current measurement unit that measures the magnitude of the release current,
3. The lifting magnet control system according to claim 1, wherein the control unit stops supplying the release current when an output signal from the current measurement unit reaches a value corresponding to the set value. 4. . The input device has a magnetic force setting mode for the operator to input a setting value of one or both of an excitation current and an excitation voltage to the lifting magnet,
4. The lifting magnet control system according to claim 1, wherein the control unit controls one or both of the excitation current and the excitation voltage based on the set value. 5. The input device has a magnet size selection mode in which the operator inputs the size of the lifting magnet,
The control unit according to claim 1, wherein the control unit controls at least one of an excitation current, an excitation voltage, and a release current based on a size of the lifting magnet input to the input device. The lifting magnet control system as described in any one of Claims.   The lifting magnet control system according to claim 1, wherein the input device has a touch panel for inputting and displaying the set value.   Each of the said magnet control apparatus and the said input apparatus has a serial communication circuit for transmitting the input from the said operator, The lifting magnet control as described in any one of Claims 1-6 characterized by the above-mentioned. system.

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