JP2006290474A - Lifting magnet control device for construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting magnet control device for driving an engine at the predetermined speed to be required for work of the lifting magnet device even if the set engine speed or torque is lowered by wrong determination and wrong operation. <P>SOLUTION: This lifting magnet control device is provided with an engine control device 21 for controlling engine speed or output torque, a machine body controller 24 for transmitting a control signal to the engine control device, and a means for changing setting of engine speed or output torque connected to an input side of the machine body controller. Furthermore, this lifting magnet control device is provided with a selector switch 26 for selecting operation mode or off-mode of the lifting magnet device, a lifting magnet revolution number setting means for setting engine speed when the lifting magnet device is operated in the operation mode, and a selector circuit for outputting the engine speed control signal to the engine control device on the basis of a command signal corresponding to the mode selected by the selector switch. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a technical field of a control device for a lifting magnet (hereinafter simply referred to as a “lift magnet device”). More specifically, the technology relates to a protection device for performing safety work of the riffmag device.

  2. Description of the Related Art Conventionally, construction work such as a hydraulic excavator is provided with a riffmag device, and loading and unloading work of a magnetic material (for example, iron scrap and steel scrap) has been performed. In construction machines provided with these riff mag devices, a hydraulic pump dedicated to the riff mag device is provided on the output shaft of the engine in addition to the hydraulic pump for the working machine. However, if the rotational speed (or output torque) of the engine is freely changed (or decreased), the rotational speed of the generator of the riff mag apparatus may change, and the riff mag apparatus may not be operated properly. Or the situation where the iron scrap and the steel scrap adsorb | sucked by the riffmag apparatus desorb | detach | desorb, and it scatters on the ground etc. also arises. Therefore, various ideas have been made so that the rotational speed of the generator does not change even when the riffmag device and the working machine are operated simultaneously.

  For example, there is an apparatus described in Patent Document 1 (hereinafter referred to as a conventional apparatus 1) as such an apparatus. FIG. 5 is a diagram showing a configuration of the conventional apparatus 1, and FIG. 6 is a diagram showing a processing procedure of the control apparatus. The conventional apparatus 1 will be briefly described below. In FIG. 5, a hydraulic pump 63 for a riff mag apparatus is connected to an output shaft of an engine 60 in addition to hydraulic pumps 61 and 62 for a working machine. The output oil path of the hydraulic pump 63 is connected to the hydraulic motor 54 via the on-off valve 53. A generator 56 is connected to the output shaft of the hydraulic motor 54, and a controller 57 for rectifying the generated electricity is connected to the output side of the generator 56, and is connected to the magnet circuit of the riff magnet device 58. On the other hand, the rotational speed of the hydraulic motor 54 is configured to be controlled by controlling the tilt angle of the regulator 55. The regulator 55 is controlled by the control device 50.

A P mode switch 51, an E mode switch 52, and an ON / OFF switch 59 of a riffmag device 58 are connected to the input side of the control device 50. The P-mode switch 51 is a switch that generates a high-revolution command signal, and the E-mode switch 52 is a switch that generates a low-revolution command signal, which is selected by the operator. In addition, the engine 60 rotates so as to have a constant target rotation speed in the P mode and the E mode.
Published patent publication, JP 2002-349503 (hydraulic drive device for generator of construction machine)

  The control device 50 executes processing according to the procedure shown in FIG. That is, in S101, it is determined whether the switch 59 is ON or OFF. If it is ON, an engine rotation command signal (P mode or E mode) is read in S102, and a table (not shown) is read based on the engine rotation command signal in S103. The tilt angle of the regulator 55 is obtained. In S104, the obtained tilt angle is output to the regulator 55, and in S105, the on-off valve 53 is opened. That is, the conventional apparatus 1 is configured such that the control device 50 controls the rotation of the hydraulic motor to be constant by detecting the cause of fluctuation of the rotation of the hydraulic motor (here, switching between the P mode and the E mode). It is an example.

FIG. 7 shows another conventional apparatus (referred to as the conventional apparatus 2) in which the rotation speed of the hydraulic motor is kept constant. Hereinafter, the conventional apparatus 2 will be briefly described. In FIG. 7, a hydraulic pump 63 for a riffmag device is connected to an output shaft of an engine 60 in addition to hydraulic pumps 61 and 62 for working machines and a hydraulic pump 64 for pilot pressure oil. The output of the hydraulic pump 63 is connected to the oil tank through the hydraulic motor 54. A generator 56 is connected to the output shaft of the hydraulic motor 54, and a controller 57 that rectifies the generated current is connected to the output side of the generator 56, and is connected to the magnet circuit of the riff magnet device 58.

  Further, the conventional apparatus 2 includes a detection unit that detects an operating state of the generator 56, a riffmag controller 70 that prevents a decrease in the rotation speed of the generator 56 based on a detection result of the detection unit, and a rotation speed of the engine 60. And a pump controller 80 for preventing the lowering of the pressure. As detection means for detecting the operating state of the generator 56, for example, a temperature sensor 71 for detecting the temperature of the magnet circuit and a signal converter 72 for converting the measured temperature signal into a voltage are provided. Further, electromagnetic switching valves 66 and 67 and a vent relief valve 68 are provided between the vent port of the relief valve 65 and the oil tank, and the electromagnetic switching valves 66 and 67 are controlled by the controller 70. The vent relief valve 68 has a relief pressure corresponding to the load when the temperature of the magnet circuit is stabilized. The throttle 91 and the relief valve 92 control the differential pressure before and after the throttle 91 constant (the flow rate flowing through the throttle 91 is constant).

  The configuration of the riffmag controller 70 is shown in FIG. The controller 70 is connected to the output end of the riffmag operator 73 and the signal converter 72 on the input side, and connected to the solenoid of the switching valve 66 on the output side. 7 and 8A, when the operation device 73 is operated, the relay 74 is connected, and the output of the switching valve 66 is connected to the input of the switching valve 67. The switching signal setting unit 75 is turned on when the temperature measured by the temperature sensor 71 is lower than a specified value, and turned off when the temperature is higher than the specified value. Therefore, when the operating device 73 is operated (the relay 74 is connected), when the measured temperature of the temperature sensor 71 is lower than a specified value (for example, when the riffmag operation starts), the switching valve 67 is driven and the vent port is Closed. At this time, the relief valve 65 becomes a high pressure set by itself. When the measured temperature becomes higher than the specified value, the vent port becomes the set pressure of the relief valve 68. That is, when the temperature of the riffmag circuit becomes higher than a specified value during the riffmag operation (for example, after a lapse of a considerable time from the start of the operation), the hydraulic motor 54 becomes a predetermined constant rotation speed (due to the set pressure of the relief valve 68).

  The configuration of the pump controller 80 is shown in FIG. The pump controller 80 is connected to the riffmag operator 73, the output end of the signal converter 72 and the accelerator operator 81 on the input side, and connected to the solenoid of the proportional pressure reducing valve 69 on the output side. The riffmag operator 73 switches the switch 84 to select the value of the OFF torque setter 82 when the riffmag operation is OFF, and the value from the ON torque setter 83 based on the signal of the temperature sensor 71 when the riffmag operation is ON. Is input to the subtractor 87. On the other hand, the work implement pump torque setting unit 86 obtains a torque installation value based on the signal from the accelerator operating unit 81 and inputs the torque installation value to the subtracter 87. The subtractor 87 obtains the subtracted value and inputs it to the signal converter 88. The signal converter 88 converts the current value into a current value and passes the current to the solenoid of the electromagnetic proportional pressure reducing valve 69, and the hydraulic pump 61, the regulator 61a, 62a. The tilt angle of 62 is controlled.

  That is, the conventional apparatus 2 controls the rotation speed of the hydraulic motor 54 by the riffmag controller 70 to prevent a decrease in the rotation speed of the generator 56 based on the temperature measured by the temperature sensor 71 during the riffmag operation. On the other hand, when the measured temperature is low, the pump controller 80 controls the hydraulic pumps 61 and 62 of the work machine to prevent a decrease in torque (discharge amount), and when the measured temperature becomes high, The torque (discharge amount) 62 is reduced.

  As described above, the conventional apparatus 1 is configured such that the rotational speed of the hydraulic motor is constant even when the input mode of the riffmag apparatus is changed, and the conventional apparatus 2 detects the temperature of the magnet circuit, In addition to controlling the rotation speed of the hydraulic motor to be constant by the riffmag controller according to the temperature, the hydraulic pump for the work implement is also controlled. However, in these conventional apparatuses, when an operation for reducing the set engine speed or torque is performed due to an operator's misjudgment or erroneous operation, the rotational speed of the hydraulic motor decreases (temporarily), and the rifmager There is a problem that the scraped iron scraps fall and are scattered on the ground or vehicles, and the work becomes complicated due to subsequent cleanup. The present invention disables these operations during the operation of the riffmag device even when an operation of lowering the set engine speed or torque due to an operator's misjudgment or erroneous operation, etc., and the predetermined rotation required for the operation of the riffmag device It is an object of the present invention to provide a riffmag control device that drives an engine with a number.

The present invention employs the following configuration as means for solving the above-described problems. That is,
The invention according to claim 1 includes a working hydraulic pump and a riffmag hydraulic pump connected to an output shaft of the engine, and a hydraulic motor is driven by the rifmag hydraulic pump to operate a generator to In a construction machine such as a hydraulic excavator equipped with a riffmag device that allows an exciting current to flow in an electromagnetic circuit of the device, an engine control device that controls the rotational speed or output torque of the engine, and a control signal is sent to the engine control device Body controller, engine speed or output torque setting changing means, a changeover switch for switching the riffmag device between an operation mode and an off mode, and a riffmag rotation speed setting for setting the engine speed in the operation mode of the riffmag device And a command signal from the riffmag rotation speed setting means when the riffmag operation mode is selected. The engine speed control signal is output to the engine control device based on the engine speed control signal, and when the rifmag-off mode is selected, the engine speed control signal is sent to the engine control device based on the command signal from the engine speed etc. setting changing means. And a selection circuit for outputting.

  According to a second aspect of the present invention, in the first aspect of the present invention, the selection circuit includes a first switch provided on a line between the riff mag rotation speed setting means and the engine control device, and the engine rotation speed. A second switch is provided in the line between the equal setting change means and the engine control device, and the first switch and the second switch are turned on when the riffmag operation mode is selected; and The second switch is turned off, and when the riff mug off mode is selected, the first switch is turned off and the second switch is turned on.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the engine speed or output torque setting changing means is connected to the input side of the engine control device, and the selection circuit is connected to the engine. It is provided in the control device.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the engine speed or output torque setting changing means is connected to the input side of the machine controller, and the selection circuit is connected to the machine controller. It is characterized in that it was provided.

According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, a part of the selection circuit is configured by a program.

According to a sixth aspect of the present invention, in the second to fifth aspects of the present invention, the first switch and the second switch are mechanically configured switches or switches configured using semiconductor elements. It is a feature.

  The present invention has an effect that, even when the operator performs an operation to reduce the set rotational speed or torque of the engine due to misjudgment or erroneous operation during the work of the riffmag apparatus, a stable work of the riffmag apparatus becomes possible.

Embodiments of the present invention will be described below with reference to the drawings.
<Embodiment 1>
FIG. 1 shows the entire configuration of the first embodiment of the present invention, and FIG. 2 shows a switching device in the machine controller. 1, in addition to the working hydraulic pumps 12 and 13, a riffmag hydraulic pump 14 is provided on the output shaft 11 a of the engine 11. The working hydraulic pumps 12 and 13 are connected so as to supply pressure oil to a plurality of switching valves 20, and the hydraulic pump 14 is connected to a hydraulic motor 16 via an electromagnetic switching valve 15. A generator 17 is connected to the output shaft of the hydraulic motor 16, and the output of the generator 17 is connected to the electromagnetic circuit of the riffmager 19 via the rectifier circuit 18.

  On the other hand, the electronic governor 11 b of the engine 11 is connected to the engine control device 21 via a line 22, and the engine control device 21 is further connected to a machine controller 24 via a line 23. A rotation speed setting changer 25 and a riffmag mode changeover switch (hereinafter referred to as a riffmag switch) 26 are connected to the input side of the machine controller 24 via a relay type switch 27. Here, the engine control device 21 calculates the fuel injection control signal based on the engine speed signal and the engine speed signal (or output torque setting signal) input from the airframe controller 24 via the line 23. The fuel injection control signal is sent to the electronic governor 11b. The rotational speed setting changer 25 is a setting device that increases or decreases the rotational speed (or output torque) of the engine 11 and plays a role similar to that of an automobile accelerator.

  FIG. 2 is a diagram illustrating in detail the portion of the machine controller 24 relating to the present embodiment. In FIG. 2, the output from the rotation speed setting device for riff mug (life rotation speed setting means) 30 is connected to the line 32 via the first switch 31, while the output from the rotation speed setting changer 25 is the second switch. It is connected to the line 32 via 33. The line 32 is connected to the input side of the arithmetic unit 29 of the machine controller 24, and the arithmetic unit 29 obtains the set rotational speed of the engine 11 based on the input signal from the line 32 and sends it to the line 23. The first switch 31 and the second switch 33 are constituted by a semiconductor switch or a mechanical switch using a conventional technology, and are turned on / off synchronously based on a signal from the riffmag switch 26. Input to the arithmetic unit 29. That is, when the riffmag switch 26 is turned on, the first switch 31 is turned on and the second switch 33 is turned off. Conversely, when the riffmag switch 26 is turned off, the first switch 31 is turned off and the second switch 33 is turned on. The circuit may be configured by a program (software). The riffmag rotation speed setting device 30 is configured so that the engine rotation speed required for the riffmag operation, that is, the engine rotation speed so that the generation of current sufficient for the operation of the riffmager and the operation of the work machine required for the riffmag operation can be performed. It is desirable to set

  Since this embodiment is configured as described above, it functions as follows. When the riffmag switch 26 is turned on, a current from the power source 35 flows to the relay type switch 27 and the contact is closed and turned on. A riffmag on signal (riffmag operation signal) is input to the machine controller 24, and the second switch 33 is turned on. The first switch 31 is opened (off), and the first switch 31 is closed (turned on). As a result, the signal from the riffmag rotation speed setting device 30 is input to the arithmetic unit 29, and the signal from the rotation speed setting changer 25 is Invalidated (not entered). Accordingly, the rotation speed of the engine 11 is set based on the signal from the riffmag rotation speed setting device 30. At the same time, the electromagnetic switching valve 15 is switched to the communication state (a) by the current from the power source 35, and the hydraulic oil of the hydraulic pump 14 flows to the hydraulic motor 16 so that the riff mug operation can be performed.

On the contrary, when the riffmag switch 26 is turned off, the current from the power source 35 does not flow through the relay switch 27, and the contact opens and turns off. In this case, the riffmag-off signal is input to the body controller 24, the first switch 31 is opened (off), and the second switch 33 is closed (turned on). As a result, the signal from the rotation speed setting unit 30 for the riff mug is not input to the arithmetic unit 29 and the signal from the rotation speed setting changer 25 is input. At the same time, the current from the power source 35 does not flow, and the electromagnetic switching valve 15 is switched to the open state (b). Accordingly, at this time, the riff mug operation is disabled, and the engine 11 is controlled in speed based on the signal from the speed setting changer 25.

<Embodiment 2>
FIG. 3 shows the entire configuration of the second embodiment of the present invention, and FIG. 4 shows a selection circuit in the engine control apparatus. 1 and FIG. 2 of the first embodiment, but the switch groups 41 and 43 that are turned on / off synchronously based on signals from the rotational speed setting changer 39 and the riff magnet switch The difference is that the engine control device 36 is provided instead of the controller 37. Therefore, differences from the first embodiment will be mainly described. In FIG. 3, the electronic governor 11 b of the engine 11 is connected to the engine control device 36 via a line 22, and the engine control device 36 is further connected to a machine controller 37 via a line 38. A rotation speed setting changer 39 is connected to the input side of the engine control device 36, and a riff magnet switch 26 is connected to the input side of the machine controller 37 via a relay type switch 27. Here, the engine control device 36 uses the engine setting speed signal (or output torque setting signal) based on the engine speed signal and the signal input from the airframe controller 37 via the line 38 to control the fuel injection amount control signal. And the fuel injection amount control signal is sent to the electronic governor 11b.

FIG. 4 is a diagram illustrating in detail the portion of the engine control device 36 relating to the present embodiment. In FIG. 4, the output from the rotation speed setting unit 40 for the riff mug is connected to the line 42 via the first switch 41, while the output from the rotation speed setting changer 39 is connected to the line 42 via the second switch 43. It is connected. The line 42 is connected to the input side of the arithmetic unit 44 of the engine controller 36, and the arithmetic unit 44 sends a fuel injection amount control signal to the line 23 based on the input signal from the line 42. The first switch 41 and the second switch 43 are constituted by a semiconductor switch or a mechanical switch using a conventional technique, and the on / off operation is synchronously performed based on a signal from the riff magnet switch 26 via the airframe controller 37 and the line 38. Then, either one of the signals is input to the arithmetic unit 44. That is, when the riffmag switch 26 is turned on, the first switch 41 is turned on and the second switch 43 is turned off. On the contrary, when the riffmag switch 26 is turned off, the first switch 41 is turned off and the second switch 43 is turned on. In the second embodiment, the circuit may be configured by a program (software) as in the first embodiment.

The second embodiment also functions in the same manner as the first embodiment. That is, when the riffmag switch 26 is turned on, current from the power source 35 flows to the relay type switch 27 and the contact is closed to turn on, and this riffmag on signal is sent to the engine control device 36 via the airframe controller 37 and the line 38. The second switch 43 is turned off and the first switch 41 is turned on. As a result, the signal from the rotation speed setting unit 40 for the riff mug is input to the arithmetic unit 44, and the signal from the rotation speed setting changer 39 is invalidated (not input). Accordingly, the rotation speed of the engine 11 is set based on the signal from the riffmag rotation speed setting device 40. At the same time, the electromagnetic switching valve 15 is switched to the communication state (a) by the current from the power source 35, and the hydraulic oil of the hydraulic pump 14 flows to the hydraulic motor 16 to enable the riff mug operation.

On the contrary, when the riffmag switch 26 is turned off, the current from the power source 35 does not flow through the relay switch 27, and the contact opens and turns off. In this case, the riffmag-off signal is input to the engine control device 36 via the airframe controller 37 and the line 38, the first switch 41 is turned off, and the second switch 43 is turned on. As a result, the signal from the rotation speed setting unit 40 for the riff mug is not input to the arithmetic unit 44 and the signal from the rotation speed setting changer 39 is input. At the same time, the current from the power source 35 does not flow, and the electromagnetic switching valve 15 is switched to the open state (b). Accordingly, at this time, the riff mug operation is disabled, and the engine 11 is controlled in speed based on the signal from the speed setting changer 39.

As described above, even when the engine speed (or torque) is changed during operation of the riffmager due to an operator's misjudgment or incorrect operation, the engine speed is not changed and stable operation is possible. The effect of becoming is obtained.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the technical scope of the present invention is not limited to this, and for example, a circuit constituted by the switches 31, 33 (or 41, 43) is soft. The case where it is configured by a wear (program) also belongs to the technical scope of the present invention.

1 shows an overall configuration diagram of Embodiment 1 of the present invention. FIG. The detailed explanatory view of the body controller of Embodiment 1 is shown. The whole block diagram of Embodiment 2 of this invention is shown. The detailed explanatory view of the engine control device of Embodiment 2 is shown. The block diagram of the conventional apparatus 1 is shown. The processing procedure of the conventional apparatus 1 is shown. The block diagram of the conventional apparatus 2 is shown. (A) The riffmag controller of the conventional apparatus 2 is shown. (B) The pump controller of the conventional apparatus 2 is shown.

Explanation of symbols

11 Engine 11b Electronic governor 12, 13 Hydraulic pump 14 Riffmag hydraulic pump 16 Hydraulic motor 17 Generator 18 Rectifier circuit 19 Riffmager 21, 36 Engine controller 24, 37 Machine controller 25, 39 (Engine) Speed setting changer 26 Riffmag switch 29, 44 Arithmetic unit 30, 40 Riffmag rotation speed setting device (Riffmag rotation speed setting means)
31, 41 First switch 33, 43 Second switch

Claims (6)

A working hydraulic pump and a riffmag hydraulic pump connected to the output shaft of the engine are provided, a hydraulic motor is driven by the riffmag hydraulic pump, a generator is operated, and an excitation current is caused to flow through the electromagnetic circuit of the riffmag device. In a construction machine such as a hydraulic excavator provided with a riffmag device as described above, an engine control device that controls the engine speed or output torque, a machine controller that sends a control signal to the engine control device, an engine speed or The output torque setting changing means, the changeover switch for switching the riffmag apparatus between the operation mode and the off mode, the riffmag rotation speed setting means for setting the engine speed in the operation mode of the riffmag apparatus, and the riffmag operation mode are selected. When the engine rotation is A selection circuit that outputs a control signal to the engine control device and outputs an engine speed control signal to the engine control device based on a command signal from the engine speed etc. setting changing means when the riff mag-off mode is selected. A riff mug control device for construction machinery. The selection circuit is provided with a first switch in a line between the riffmag rotation speed setting means and the engine control device, and a second switch is provided in a line between the engine rotation speed setting change means and the engine control device, The first switch and the second switch are turned on when the riff mug operation mode is selected, and turned off when the second switch is turned off and the riff mug off mode is selected. The riff mug control device for a construction machine according to claim 1, wherein the first switch is turned off and the second switch is turned on. The engine speed or output torque setting changing means is connected to the input side of the engine control device, and the selection circuit is provided in the engine control device. The riff mug control device for the construction machine described. 3. The engine speed or output torque setting change means is connected to the input side of the machine controller, and the selection circuit is provided in the machine controller. Riffmag control device for construction machinery. The riff mug control device for a construction machine according to any one of claims 1 to 4, wherein a part of the selection circuit is configured by a program. 6. The riff mug control for a construction machine according to claim 2, wherein the first switch and the second switch are mechanically configured switches or switches configured by using a semiconductor element. apparatus.

Images