JP2007182302A - Control device for magnet specification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a magnet specification apparatus, capable of preventing decline in attracting ability of a magnet. <P>SOLUTION: A hydraulic motor 13 is operated by working fluid supplied from a hydraulic pump 12 driven by an engine 6. By the hydraulic motor 13, a rotor 14a of a generator 14 is rotated. The generator 14 performs power generation by supplying a field current to a field coil 14b during rotation of the rotor 14a to supply electric power to the magnet 5. In a certain condition, a magnet controller 19 for controlling the electric power supply to the magnet 5 stops supply of the field current to the field coil 14b of the generator 14 and continues supply of the working fluid from the hydraulic pump 12 to the hydraulic motor 13, during stop of electric power supply to the magnet 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for a magnet specification machine equipped with an electromagnet for lifting scraps and the like.

Hydraulic pump that cuts off the flow supply to the hydraulic motor that drives the generator and supplies pressure oil to the hydraulic motor that drives the generator when the electromagnet is de-excited A clutch is provided between the engine and the engine.When the electromagnet is not energized, the clutch is disengaged to stop rotation, and the hydraulic pump that supplies pressure oil to the hydraulic motor that drives the magnet generator is a variable displacement type. Some non-excited hydraulic pumps have a minimum capacity (see, for example, Patent Document 1).
JP 2002-348087 A (page 3-4, FIG. 1-3)

  The conventional energy-saving operation stops or minimizes the rotation of the hydraulic motor that drives the generator when the electromagnet is de-excited. However, when the hydraulic motor performs suction operation from a stopped state and resumes power generation, the following problems occur: Occurs.

  Since the rise of the rotation of the hydraulic motor is slow, sufficient generated power cannot be obtained at the start of suction, and the attraction capability of the electromagnet at the start of suction is reduced.

  In order to obtain sufficient power with the generator rotating at a low speed, it is necessary to apply an excessive field current to the field coil of the generator. The electromagnet's attraction ability decreases.

  This invention is made in view of such a point, and it aims at providing the control apparatus of the magnet specification machine which can prevent the fall of the attraction | suction capability of an electromagnet.

  The invention according to claim 1 is a magnet specification machine in which an arm-like working machine having an electromagnet at the tip is mounted on the body, an engine mounted on the body, a fluid pressure pump driven by the engine, A fluid pressure motor operated by a working fluid supplied from a fluid pressure pump, a rotor rotated by the fluid pressure motor, and a field coil that generates electric power by supplying a field current when the rotor rotates. A generator that supplies electric power to the electromagnet, and operation of the fluid pressure pump to the fluid pressure motor is stopped and the supply of field current to the field coil of the generator is stopped under certain conditions when power supply to the electromagnet is stopped This is a control device for a magnet specification machine including a magnet controller for continuing the supply of fluid.

  According to a second aspect of the present invention, in the control apparatus for a magnet-spec machine according to the first aspect, the magnet controller further includes an engine controller that reduces the engine speed when both the electromagnet and the working machine continue for a certain time in a non-operating state. The machine stops the power generation by stopping the field current to the field coil of the generator when both the electromagnet and the working machine are in the non-operating state and the engine speed falls below a specified speed.

  According to a third aspect of the present invention, in the control device for the magnet specification machine according to the first or second aspect, a bypass valve for stopping the supply of the working fluid from the fluid pressure pump to the fluid pressure motor is provided.

  According to a fourth aspect of the present invention, when the magnet controller in the controller for the magnet specification machine according to the second or third aspect stops the power generation by stopping the field current for a certain period of time, the rotor of the generator is turned off. It is to stop.

  According to the first aspect of the present invention, even when the power generation is stopped by stopping the power supply to the field coil of the generator, the rotation of the fluid pressure motor, that is, the rotation of the generator rotor is stopped under certain conditions. Therefore, the rising delay of the rotation of the rotor of the generator is small, and sufficient generated power can be obtained at the start of suction, so that the attraction capability of the electromagnet at the start of suction can be increased.

  According to the second aspect of the present invention, since the field current is allowed to flow through the field coil of the generator unless the engine rotational speed exceeds the specified rotational speed, power generation is not performed. Since an excessive field current does not flow through the field coil of the generator, early deterioration of the generator due to heat generated by the field coil can be prevented, and a predetermined attracting force of the electromagnet can be secured by preventing heat generation.

  According to the third aspect of the present invention, the generator can be stopped without stopping the engine and the fluid pressure pump by opening the bypass valve, and the generator can be restarted quickly by closing the bypass valve. .

  According to the fourth aspect of the present invention, when the electromagnet and the work machine are not operated, the engine speed is decreased after a predetermined time has elapsed, and the power generation is stopped when the engine speed falls below the specified speed. Since the generator rotor is stopped for a certain period of time, the engine load can be efficiently reduced while preparing to restart the generator, and the fuel efficiency can be improved.

  Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS.

  As shown in FIG. 2, the magnet specification machine is a machine body B in which an arm-like work machine M is mounted, and the machine body B is provided with an upper swing body 2 that can turn relative to the lower traveling body 1. Yes.

  In the working machine M, the base end of the boom 3 is pivotally supported on the upper swing body 2 so as to be rotatable in the vertical direction, and an arm 4 is pivotally supported on the distal end of the boom 3. A magnet 5 as an electromagnet replaced with a bucket is pivotally supported. The boom 3 is rotated by the boom cylinder 3a, the arm 4 is rotated by the arm cylinder 4a, and the magnet 5 is rotated by the bucket cylinder 5a.

  As shown in FIG. 1, main pumps 7 and 8 driven by the engine 6 are connected to an engine 6 mounted on the airframe B, and discharge ports of the main pumps 7 and 8 are connected to a control valve 9. The output port of the control valve 9 includes a turning motor 10 for turning the upper turning body 2, traveling motors 11 a and 11 b for driving a crawler belt provided on the lower traveling body 1, a boom cylinder 3 a, an arm cylinder 4 a, a bucket Each is connected to the cylinder 5a.

  The engine 6 is connected with a hydraulic pump 12 as a fluid pressure pump for operating the generator driven together with the main pumps 7 and 8, and an operation supplied from the hydraulic pump 12 is provided at the discharge port of the hydraulic pump 12. A hydraulic motor 13 as a fluid pressure motor operated by hydraulic fluid as fluid is connected by a pipe line, and a generator 14 for supplying electric power to the magnet 5 is connected to a drive shaft of the hydraulic motor 13. .

  The hydraulic motor 13 is provided with a plurality of bypass circuits. These bypass circuits include a bypass valve 15 capable of stopping the supply of hydraulic oil from the hydraulic pump 12 to the hydraulic motor 13, and a circuit pressure setting circuit. A relief valve 16 and a check valve 17 for preventing vacuum are provided, and a check valve 18 for ensuring back pressure is provided in a return passage from the hydraulic motor 13 to the tank.

  The generator 14 includes a rotor 14a rotated by the hydraulic motor 13 and a field coil 14b that generates electric power by supplying a field current when the rotor 14a rotates.

  A magnet controller 19 that controls power supply to the magnet 5 includes a mode switch 20 that is turned on when the magnet is operated, a magnet operation switch 21 that switches excitation / de-energization of the magnet 5, and a reset switch that releases a pause state described later. 22 and a monitor 23 for displaying the control state of the magnet controller 19 are connected to each other.

  The engine controller 24 for controlling the engine speed detects the operation of the accelerator dial 25 as an accelerator operating device for setting the engine speed and the operation of the work machine M by the movement of the operating lever or the generation of pilot operating pressure. The work machine operation detector 26 is connected. Further, a mode switch signal and a magnet operation signal are output from the magnet controller 19 to the engine controller 24, while a power generation control signal is output from the engine controller 24 to the magnet controller 19.

  When the power supply to the magnet 5 is stopped, the magnet controller 19 stops the supply of the field current to the field coil 14b of the generator 14 under certain conditions, and the hydraulic oil from the hydraulic pump 12 to the hydraulic motor 13 is stopped. Supply has a function to continue.

  The engine controller 24 has a function of reducing the engine speed when both the magnet 5 and the work machine M are in a non-operating state for a predetermined time. Similarly, the magnet controller 19 stops the field current to the field coil 14b of the generator 14 when both the magnet 5 and the work machine M are in a non-operating state and the engine speed falls below a specified speed. And has a function of stopping power generation.

  The magnet controller 19 has a function of stopping the rotor 14a of the generator 14 by the bypass valve 15 when the power generation stop state in which the power generation is stopped by the stop of the field current continues for a certain time.

  Next, the operation of this embodiment will be described with reference to FIGS.

  In FIG. 3, a power generation control signal sent from the mode switch 20, the magnet operation switch 21, and the engine controller 24 is read by the input processor S1.

(1) When not in magnet working mode The mode switch signal is judged by the judging device S2, and when the mode switch 20 is off, it is not in the magnet working mode, so the processing moves to the processing device S11, the bypass valve 15 is turned off, and the hydraulic motor 13 is turned on. Is stopped, the hydraulic motor 13 that drives the generator 14 is stopped.

(2) When the magnet is working in the magnet working mode When the mode switch 20 is turned on in the judging device S2, the operation proceeds to the judging device S3 to determine the state of the pause flag. The pause flag is a flag for determining whether the mode is a pause mode described later. When the pause flag is off, the bypass valve 15 is turned on by the processor S4 to supply pressure oil to the hydraulic motor 13 to drive the generator 14. In addition, the sleep timer for entering the sleep mode is reset in the processor S5. Next, the processor S6 supplies a field current to the field coil 14b of the generator 14 to generate power.

  The determination device S7 determines the magnet operation signal of the magnet operation switch 21, and if it is on, the processing device S8 applies current to the magnet 5 to excite it. Next, the processing unit S9 turns on the reverse excitation flag for controlling the reverse excitation at the time of release, and resets the reverse excitation timer. Thereafter, the magnet operation signal output to the engine controller 24 by the processor S10 is turned on and output.

  When the magnet operation switch 21 is turned off after the magnet 5 is attracted, the determination unit S7 moves to the determination unit S12, and the reverse excitation flag is confirmed. When the reverse excitation flag is on, a reverse current is passed through the magnet 5 for a predetermined time in the following process to forcibly release it.

  Judgment unit S13 determines whether the excitation timer has reached the specified value. If the specified value has not been reached, processor S14 counts up the excitation timer, and processor S15 forcibly releases the reverse current through magnet 5. To do. Thereafter, the magnet operation signal output to the engine controller 24 by the processor S10 is turned on and output. While the magnet operation signal is on, the magnet 5 can be excited or reverse-excited.

  When the excitation timer reaches the specified value in the determination unit S13, the reverse excitation flag is turned off in the processing unit S16, and the reverse current flowing in the magnet 5 is turned off in the processing unit S17. Thereafter, the magnet operation signal output to the engine controller 24 by the processor S18 is turned off and output.

(3) When not working in magnet work mode (Fig. 4)
When the reverse excitation flag is off in the determination unit S12, the magnet 5 is not used. In that case, it is confirmed that the generator 14 is not generating power, and when the state continues for a certain time by the pause timer, the pause mode is entered.

  If the reverse excitation flag is off in the determiner S12, the process proceeds to the determiner S24 to check the power generation control signal sent from the engine controller 24. If the same signal is off, the processor S25 uses the field of the generator 14 The current is turned off, and the pause timer is counted up in the processor S26. Next, it is determined whether or not the pause timer has reached a specified value in the processor S27, and when it reaches the specified value, the pause flag is turned on in the processor S28.

(4) When canceling sleep mode (Fig. 5)
If the determination unit S3 is in the sleep mode, the processor S29 reads the signal of the reset switch 22. If the reset switch is ON in the determiner S30, the processor S31 turns off the pause flag and cancels the pause mode.

  Next, the control of the engine controller 24 will be described based on FIG.

  The mode switch signal sent from the mode switch 20 by the input processor E1 in FIG. 6, the magnet operation signal sent from the magnet controller 19, the signal from the work machine operation detector 26, and the accelerator dial signal from the accelerator dial 25. Read.

(1) When not in the magnet work mode When the mode switch 20 is OFF in the determination device E2, the accelerator control for the normal work is performed in the processor E9.

(2) When the magnet is working in the magnet work mode When the mode switch 20 is ON in the judgment device E2, the judgment device E3 checks the magnet operation signal and the signal of the work equipment operation detector 26, and either signal is If it is ON, the accelerator dial set value for setting the engine speed is determined by the determiner E4. If the accelerator dial 25 is equal to or lower than the work lower limit accelerator value, the processing unit E5 sets the accelerator dial set value to the work lower limit accelerator value. Next, the standby timer is reset by the processor E6, the engine speed is confirmed by the determiner E7, and if the engine speed reaches the working lower limit speed or more, the power generation control signal is turned on by the processor E8 and the magnet is turned on. Output to the controller 19.

(3) When magnet operation is not performed in the magnet operation mode When both the magnet operation signal and the work equipment operation detector 26 signal are off in the judgment unit E3, the engine is automatically activated after a certain period of time. Reduce the rotational speed to the standby rotational speed.

  The determination device E10 determines whether or not the standby timer has reached a specified value, and if not, the processor E11 counts up the standby timer. When the standby timer reaches the specified value, it is determined by the determiner E12 whether the accelerator dial set value is larger than the standby accelerator value, and when it is larger, the processor E13 sets the accelerator dial set value to the standby accelerator value. Next, the accelerator dial set value and the power generation lower limit accelerator value are compared by the determiner E14.If the accelerator dial set value is lower than the power generation lower limit accelerator value, the power generation control signal is turned off by the processor E15 and the magnet controller 19 is set. Output.

  Next, the effect of this embodiment will be described.

  In the energy saving operation of the prior art, the hydraulic motor that drives the generator is stopped or minimally rotated when the magnet is not excited, but in this embodiment, the power generation is stopped by stopping the power supply to the field coil 14b of the generator 14. Even in the standby state, the rotation of the hydraulic motor 13, that is, the rotation of the rotor 14a of the generator 14 is not stopped. Therefore, the rise delay of the rotation of the rotor 14a of the generator 14 is small, and sufficient generated power is obtained at the start of suction. Therefore, the attraction ability of the magnet 5 at the start of attraction can be increased.

  If the engine speed does not exceed the specified speed, a field current is passed through the field coil 14b of the generator 14 so that power generation is not performed. Since an excessive field current does not flow through 14b, early deterioration of the generator 14 due to heat generation of the field coil 14b can be prevented, and a predetermined attracting force of the magnet 5 can be secured by preventing heat generation.

  By opening the bypass valve 15 as shown in FIG. 1, the supply of hydraulic oil from the hydraulic pump 12 to the hydraulic motor 13 is stopped, so that the generator 14 can be rotated without stopping the engine 6 and the hydraulic pump 12. The child 14a can be stopped, and the generator 14 can be restarted quickly by closing the bypass valve 15.

  When the magnet 5 and the work machine M are not operated for a certain period of time, the engine speed is reduced, and when the engine speed falls below a specified speed, the field current is stopped to stop the power generation. If the state continues for a certain period of time counted by the pause timer, the rotor 14a of the generator 14 is stopped, so the engine load can be efficiently reduced while preparing for the restart of the generator 14, and the fuel efficiency can be reduced. Can be improved.

  The present invention is applicable not only to a hydraulic excavator type magnet specification machine but also to a crane type magnet specification machine.

It is a system configuration figure showing one embodiment of a control device of a magnet specification machine concerning the present invention. It is a side view of a magnet specification machine same as the above. It is a flowchart which shows the control procedure of the magnet controller in a control apparatus same as the above. It is a flowchart which shows the pause mode procedure of a magnet controller same as the above. It is a flowchart which shows the suspension mode cancellation | release procedure of a magnet controller same as the above. It is a flowchart which shows the control procedure of the engine controller in a control apparatus same as the above. It is a time chart which shows the control state of each part in a control apparatus same as the above.

Explanation of symbols

B Airframe M Working machine 5 Magnet as electromagnet 6 Engine
12 Hydraulic pump as fluid pressure pump
13 Hydraulic motors as fluid pressure motors
14 Generator
14a rotor
14b Field coil
15 Bypass valve
19 Magnet controller
24 Engine controller

Claims (4)

It is a magnet specification machine with an arm-shaped working machine with an electromagnet at the tip attached to the fuselage,
The engine mounted on the aircraft,
A fluid pressure pump driven by the engine;
A fluid pressure motor operated by a working fluid supplied from the fluid pressure pump;
A rotor that is rotated by the fluid pressure motor and a generator that has a field coil that generates power by supplying a field current when the rotor rotates, and that supplies power to the electromagnet;
A magnet controller that stops the supply of field current to the field coil of the generator under certain conditions when power supply to the electromagnet is stopped and continues to supply the working fluid from the fluid pressure pump to the fluid pressure motor. A control device for a magnet specification machine characterized by the above. It has an engine controller that reduces the engine speed when both the electromagnet and work implement are in non-operating state for a certain period of time
The magnet controller
The power generation is stopped by stopping the field current to the field coil of the generator when both the electromagnet and the work machine are in the non-operating state and the engine speed falls below a specified speed. The control device for the magnet specification machine according to 1. The control device for a magnet specification machine according to claim 1 or 2, further comprising a bypass valve for stopping supply of the working fluid from the fluid pressure pump to the fluid pressure motor. The magnet controller according to claim 2 or 3, wherein the magnet controller stops the rotor of the generator when the state in which the power generation is stopped by the stop of the field current continues for a predetermined time.

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