JPH08270608A - Control device for hydraulic circuit - Google Patents

Abstract

PURPOSE: To provide a control device for a hydraulic circuit whereby supplying/ stopping operating oil can be performed by simple operation. CONSTITUTION: A reset type switch is used in a turn inhibiting switch 4, to detect operation of this turn inhibiting switch 4 by a CPU 3. In the CPU3, a transistor 8 is alternately on/off controlled at each operating the turn inhibiting switch 4, to switch an upper turn unit to a turnable 'drive mode' and to an unturnable 'non-drive mode'. In the CPU3, a transistor 12 is on/off controlled at each operating the turn inhibiting switch 4, to put out an LED14 when switched to the 'drive mode' and to light the LED14 when switched to the 'non-drive mode'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit control device.

[0002]

2. Description of the Related Art Conventionally, construction machines such as power shovels and cranes have an upper revolving structure including excavation and suspension arms, a driver's seat, etc., a traveling function for moving and a supporting mechanism for the upper revolving structure. It is composed of an undercarriage. The upper swing body is rotatably supported by the lower traveling body, and is swing-driven by a hydraulic circuit 50 shown in FIG. 3, for example.

As shown in FIG. 3, the hydraulic oil stored in the oil tank 51 of the hydraulic circuit 50 is the prime mover 5 of the construction machine.
It is pumped up by an oil pump 53 which is rotationally driven by 2, and is supplied to a direction switching valve 54. The direction switching valve 54 includes a turning operation lever 55 provided in a driver's seat (not shown).
Is attached. The travel switching valve 54 has pipes 56, 5
It is connected to the hydraulic motor 58 via 7. The direction switching valve 54 is always urged to the neutral position by the elastic force of a spring or the like. At this time, hydraulic oil is not supplied to the hydraulic motor 58.

The directional control valve 54 supplies hydraulic oil to the hydraulic motor 58 via the conduit 56 when it is in the position 54a in accordance with the operation of the turning operation lever 55, and in the position 54b.
Hydraulic oil is supplied to the hydraulic motor 58 through the line 57 when
To be supplied. The hydraulic motor 58 is rotationally driven based on the supplied hydraulic oil, and the hydraulic motor 5
With the rotation of 8, the upper revolving structure makes a revolving motion.

By the way, some operations of construction machines do not require a turning operation. Therefore, the oil pump 5
An electromagnetic valve 59 is provided between the switch 3 and the direction switching valve 54. The solenoid valve 59 is constantly urged to the position 59a by an elastic force such as a spring, so that the oil pump 53 moves from the direction switching valve 54.
The hydraulic oil is not supplied to the. A turning prohibition switch 60 is connected in series to the coil 59c of the solenoid valve 59. The turning prohibition switch 60 is provided in a driver's seat (not shown) and is controlled to be turned on (closed) or turned off (open) by an operator. When the turning prohibition switch 60 is controlled to be turned on, the coil 59c of the solenoid valve 59 is connected to the battery power source +
B is supplied and the coil 59c is excited. The electromagnetic valve 59 is operated to the position 59b based on the excitation of the coil 59c, and the hydraulic oil is supplied from the oil pump 53 to the direction switching valve 54. When the operator operates the turning operation lever 55 in this state, hydraulic oil is supplied based on the operation and the hydraulic motor 58 is rotationally driven. Based on the rotational drive of the hydraulic motor 58, the upper-part turning body is turned. That is, by turning on the turning prohibition switch 60, the upper revolving structure can be turned. The state in which the upper swing body can swing is referred to as a "swing mode".

On the other hand, when the turning prohibition switch 60 is turned off (open circuit), no current flows through the coil 59c and the coil 59c is no longer excited. Then, the electromagnetic valve 59 is biased to the position 59a by the elastic force, and the hydraulic oil is not supplied to the direction switching valve 54. Therefore, even if the turning operation lever 55 is operated, the hydraulic oil is not supplied to the hydraulic motor 58 and the hydraulic motor 58 does not rotate, so that the upper-part turning body cannot turn. That is, by turning off the turning prohibition switch 60, the upper-part turning body can be made unturnable. This state in which the upper revolving structure cannot turn is called the "turning prohibition mode".

Further, an indicator (not shown) is provided on the driver's seat. The indicator is lit, for example, when the turning prohibition switch 60 is off, and is turned off when the turning prohibition switch 60 is on. That is, the operator can confirm whether the current mode is the "turning mode" or the "turning prohibition mode" by checking the indicator.

Therefore, by confirming the operation state of the turning prohibition switch 60 or the indicator, the operator confirms whether the current mode is the "turning mode" or the "turning prohibition mode". Then, in the "turning mode", the operator can operate the turning operation lever 55 to turn the upper turning body.

On the other hand, in the "turning prohibition mode", the operator first turns on the turning prohibition switch 60. Then, the hydraulic oil is supplied from the solenoid valve 59 to the direction switching valve 54. After that, when the operator operates the turning operation lever 55, the hydraulic oil is supplied to the hydraulic motor 58 based on the operation, so that the upper turning body turns.

[0010]

By the way, the turning prohibition switch 60 is an alternate switch which is a holding type switch, and the open / closed state is changed by an operation, and the state is held until the next operation is performed. ing. Therefore, when the upper revolving structure is turned, the operator first needs to confirm the "turning mode" or "turning prohibition mode" by visually observing the state of the indicator or the direct turning prohibition switch 60. When the current mode is the "turning prohibition mode", the operator first turns on the turning prohibition switch 60 to change the mode to the "turning mode", and operates the turning operation lever 55 to operate the upper turning body. To turn. After that, the operator needs to operate the turning prohibition switch 60 to change the mode to the "turning prohibition mode" in order to make the upper revolving structure unable to turn. Therefore, the operator must operate the turning prohibition switch 60 before and after the turning operation of the upper-part turning body, which causes a problem that the operation is troublesome.

Further, even if the prime mover 52 is stopped with the turning prohibition switch 60 turned on and in the "turning mode", the turning-on prohibition switch 60 remains in the ON state. Therefore, when the prime mover 52 is operated next time,
Since the state of the turn prohibition switch 60 is held,
The "turning mode" is set. Therefore, the operator is
When 2 is operated, it is necessary to check the state of the indicator or the turning prohibition switch 60 and change the current mode to the "turning prohibition mode", which is a troublesome problem.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a hydraulic circuit control device capable of switching modes by a simple operation.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a hydraulic circuit provided with a hydraulic device driven by hydraulic oil supplied based on the operation of an operating lever. On the other hand, a control device for a hydraulic circuit that controls switching between a drive mode in which the hydraulic device is driven and a non-drive mode in which the hydraulic device is not driven by the operation of an operating lever. ON / OFF control is alternately performed each time the resettable switch is operated based on the detection result of the operation for detecting the operation and the detection result of the detection means, and the hydraulic device is driven when the ON / OFF control is performed. The gist of the present invention is to provide a switching means for controlling the hydraulic device to a non-driving mode when the hydraulic device is controlled to a mode and turned off.

According to a second aspect of the present invention, in the hydraulic circuit control device according to the first aspect, the operation detecting means for detecting an operation of the operation lever, and the detection result of the operation detecting means After the resettable switch is operated, the operation lever is operated within the predetermined time based on the judgment means for judging whether the operation lever is operated within the predetermined time and the judgment result of the judgment means. When not present, the gist is that the switching device is controlled to switch the hydraulic device to the non-driving mode.

According to a third aspect of the present invention, in the hydraulic circuit control device according to the first aspect, a measuring means for measuring a time after at least one of the reset switch and the operation lever is operated. And an operation detecting means for detecting an operation of the operation lever, and the operation lever based on a detection result of the operation detecting means, after the return-type switch is operated and before a predetermined time elapses by the measuring means. Based on the detection result of the operation detection means, the measurement result of the measurement means, and the determination result of the determination means, at least one of the reset type switch and the operation lever. If the operating lever is not operated within a predetermined time after the is operated, the switching device is controlled to switch the hydraulic device to the non-driving mode. And gist that a replacement unit.

[0016]

Therefore, according to the first aspect of the invention, the detecting means detects the operation of the reset switch. Then, by the switching means, based on the detection result of the detection means,
Each time the resettable switch is operated, it is controlled to be turned on and off alternately. When it is controlled to be on, the hydraulic system is controlled to drive mode, and when it is controlled to off, the hydraulic system is controlled to non-drive mode. To be done.

According to the second aspect of the invention, the operation detecting means detects the operation of the operation lever, and the judging means operates the return type switch based on the detection result of the operation detecting means, and then the predetermined operation is performed. It is determined whether or not the operation lever has been operated within the time. Then, the switching means controls the switching element to switch the hydraulic device to the non-driving mode when the operation lever is not operated within a predetermined time based on the determination result of the determination means.

According to the third aspect of the invention, the measuring means measures the time since at least one of the reset switch and the operating lever is operated. The operation detecting means detects the operation of the operation lever. The determining means determines, based on the detection result of the operation detecting means, whether or not the operation lever has been operated by the measuring means after the reset switch has been operated and before the predetermined time has elapsed. Then, the switching means, based on the detection result of the operation detecting means, the measurement result of the measuring means, and the judgment result of the judging means, after at least one of the reset switch and the operation lever is operated,
If the operation lever is not operated within the specified time,
The hydraulic device is switched to the non-drive mode by controlling the switching element.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIGS. In this embodiment, the same members as those in the prior art are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, a battery E is provided in a construction machine (not shown). One end of the starter switch 1 is connected to the positive terminal of the battery E, and the other end of the starter switch 1 is connected to the constant voltage circuit 2. The starter switch 1 is provided in the driver's seat of the construction machine. When the starter switch 1 is operated to be turned on, the prime mover 52 is driven based on the operation, and the battery power + B is supplied from the battery E to the constant voltage circuit 2. Then, the constant voltage circuit 2 is adapted to generate and output a driving power supply Vcc of a predetermined voltage based on the supplied battery power supply + B.

A power supply terminal of a one-chip microcomputer (hereinafter referred to as CPU) 3 is connected to the constant voltage circuit 2. The constant voltage circuit 2 outputs the generated driving power Vcc having a predetermined voltage to the CPU 3.

The CPU 3 is provided with input ports I1 and I2 and output ports O1 and O2. Input port I
One end of the turning prohibition switch 4 is connected to 1, and the other end of the turning prohibition switch 4 is connected to the negative terminal of the battery E. A pull-up resistor 5 is connected to the turning prohibition switch 4. The turning prohibiting switch 4 is a return type switch, and its contact is always urged to an off (open) state by an elastic force of a spring or the like (not shown).
The contact of the turning prohibiting switch 4 is turned on (closed) only while the operator is operating it, and the contact is turned off when the hand is released. That is, the turning prohibition switch 4
Is always off, and an H-level signal is input to the CPU 3 through the input port I1 by the pull-up resistor 5. When the turning prohibition switch 4 is turned on by the operator's operation, an L level signal is input to the CPU 3 via the input port I1. Therefore, the CPU 3 can detect whether or not the turning prohibiting switch 4 is operated based on the signal input through the input port I1.

One end of the operation detection switch 6 is connected to the input port I2 of the CPU 3, and the other end of the operation detection switch 6 is connected to the negative terminal of the battery E. Also,
A pull-up resistor 7 is connected to the operation detection switch 6. The operation detection switch 6 is the turning operation lever 5
On / off control is performed based on the operation of 5. When the turning operation lever 55 is not operated (when the direction switching valve 54 is in the neutral position), the operation detection switch 6 is biased to the off (open) state by the elastic force of a spring or the like (not shown). When the turning operation lever 55 is operated, the operation detection switch 6 is controlled to be turned on based on the operation. That is, the operation detection switch 6 is always off, and the pull-up resistor 7 causes the H-level signal to pass through the input port I2 to CP.
Input to U3. Then, the operator turns the turning operation lever 5
5 is operated, the operation detection switch 6 is turned on based on the operation, and an L level signal is input to the input port I2.
Is input to the CPU 3 via. Therefore, the CPU 3 can detect the state of the operation detection switch 6, that is, whether or not the turning operation lever 55 is operated, based on the signal input through the input port I2.

The base of the transistor 8 is connected to the output port O1 of the CPU 3. Transistor 8 is N
The PN transistor is turned on when an H level signal is input from the CPU 3 to its base, and turned off when an L level signal is input. One end of the coil portion 10 of the relay 9 is connected to the collector of the transistor 8, and the emitter is connected to the negative terminal of the battery E. The other end of the coil portion 10 of the relay 9 is connected to the constant voltage circuit 2, and the constant voltage circuit 2 drives the driving power source Vcc.
Is supplied. At one end of the contact portion 11 of the relay 9,
One end of the coil 59c of the solenoid valve 59 is connected to the contact portion 1
The other end of 1 is connected to the negative terminal of the battery E. The other end of the solenoid valve 59 is connected to the plus terminal of the battery E, and the battery power + B is supplied from the battery E.

The contact portion 11 of the relay 9 is always urged to an off (open) state by an elastic force such as a spring (not shown). When a current flows through the coil portion 10 and is excited, the contact portion 11 is controlled to be on (closed) by the excitation of the coil portion 10. Then, when the contact portion 11 of the relay 9 is controlled to be turned on, a current flows through the coil 59c of the solenoid valve 59 connected to the contact portion 11 based on the battery power source + B and is excited. By exciting the coil 59c, the solenoid valve 59 is switched to the position 59b, and the hydraulic oil in the oil tank 51 is transferred to the oil pump 53.
Is supplied to the direction switching valve 54. When the turning operation lever 55 is operated, the direction switching valve 54 is controlled to the position 54a or the position 54b based on the operation. By the positions 54a and 54b of the direction switching valve 54, hydraulic oil is supplied to the hydraulic motor 58 from the conduit 56 or 57. Then, the hydraulic oil drives the hydraulic motor 58 so that the upper swing body swings. That is, when the transistor 8 is controlled to be turned on, the upper swing body is set to the "turning mode" in which it can turn.

The transistor 8 has a CPU 3 at its base.
When the signal of L level is input from, it turns off. Then
Since no current flows in the coil portion 10 of the relay 9 and the relay portion 9 is not excited, the contact portion 11 is controlled to be turned off by the elastic force. As a result, no current flows through the coil 59c of the solenoid valve 59, so that the solenoid valve 59 is controlled to the position 59a by the elastic force, and the supply of hydraulic oil to the direction switching valve 54 is stopped. Then, even if the turning operation lever 55 is operated, the hydraulic oil is not supplied, the hydraulic motor 58 is not driven, and the upper-part turning body does not turn. That is, when the transistor 8 is controlled to be turned off, the upper swing body is set to the "turning prohibition mode" in which the upper swinging body cannot turn.

The base of the transistor 12 is connected to the output port O2 of the CPU 3. Transistor 12
Is an NPN transistor, the base of which is the CPU3
Is turned on when an H level signal is input, and turned off when an L level signal is input. The cathode of a light emitting diode (hereinafter referred to as LED) 14 is connected to the collector of the transistor 12 via a resistor 13, and the emitter of the transistor 12 is connected to the negative terminal of the battery E. The anode of the LED 14 is connected to the constant voltage circuit 2 and the constant voltage circuit 2 drives the drive power source V
cc is supplied.

The transistor 12 has a CPU as its base.
When an L-level signal is input from 3, it turns off. Then, since no current flows through the LED 14, the LED 14 is not turned on. When an H-level signal is output from the output port O2 of the CPU3 to the base of the transistor 12,
The transistor 12 is turned on. Then, LED14,
An electric current flows through the resistor 13 and the transistor 12,
D14 is turned on.

Further, the transistor 12 is controlled to be turned on / off in accordance with the current mode of the upper swing body. That is, in the "turning mode", the CPU 3 controls the transistor 12 to be off. Then, since no current flows through the transistor 12, the LED 14 is turned off. In the "turning prohibition mode", the CPU 3 controls the transistor 12 to be turned on. Then, a current flows through the transistor 12 and the LED 14 is turned on.
That is, by confirming whether or not the LED 14 is turned on, it is possible to confirm whether the upper swinging body is in the "turning mode" in which the upper swinging body can turn or the "turning prohibition mode" in which the upper turning body cannot turn.

The CPU 3 is provided with a read-only memory (hereinafter referred to as ROM) 15 and a readable / writable memory (hereinafter referred to as RAM) 16. R
The control program of the CPU 3 is stored in the OM 15. The CPU 3 detects the state of the turning prohibition switch 4 via the input port I1 based on the control program. The turning prohibition switch 4 is always urged to be off. Then, each time the turning prohibition switch 4 is turned on, the CPU 3 turns off the transistor 8 when the transistor 8 is on, and turns on the transistor 8 when the transistor 8 is off. To control.

When the transistor 8 is controlled to be turned on, a current flows through the coil portion 10 of the relay 9 to be excited, and the excitation causes the contact portion 11 to be turned on. Then, when the contact portion 11 of the relay 9 is controlled to be turned on, a current flows through the coil 59c of the solenoid valve 59 to be excited, and the excitation causes the solenoid valve 59 to move to the position 59b to supply hydraulic oil to the direction switching valve 54. It Then, operating oil is supplied to the hydraulic motor 58 from the conduits 56 or 57 according to the operation of the turning operation lever 55, the hydraulic motor is driven by the operating oil, and the upper-part turning body comes to perform a turning operation. That is, the transistor 8
When is turned on, the upper revolving structure is set to the "turning mode" in which the upper turning body can turn.

When the transistor 8 is controlled to be turned off, no current flows through the coil portion 10 of the relay 9, so that it is not excited and the contact portion 11 is turned off. Then, no current flows through the coil 59c of the solenoid valve 59, so that the solenoid valve 59 is moved to the position 59a by the elastic force, and the hydraulic oil is not supplied to the direction switching valve 54. Therefore, even if the turning operation lever 55 is operated, the hydraulic oil is not supplied, the hydraulic motor 58 is not rotationally driven, and the upper-part turning body cannot turn. That is, when the transistor 8 is controlled to be turned off, the "turning prohibition mode" in which the upper-part turning body is unable to turn is set.

That is, the CPU 3 alternately sets the "turning mode" and the "turning prohibition mode" each time the turning prohibition switch 4 is turned on. Also, CP
U3 detects the state of the operation detection switch 6, that is, the operation of the turning operation lever 55, via the input port I2 based on the control program stored in the ROM 15. Then, after the "turning mode" is set, if the turning operation lever 55 is not operated within a predetermined time set in advance, the CPU 3 determines that the turning operation of the upper turning body is unnecessary for the work at that time. to decide. Then, the predetermined time set in advance is set to a time longer than the interval at which the turning operation lever 55 is operated in the work requiring the turning operation of the upper-part turning body. The predetermined time set in advance is hereinafter referred to as a mode switching time.

When the CPU 3 determines that the swinging motion of the upper swing body is unnecessary, the transistor 3 controls the transistor 8 to turn off and the contact portion 11 of the relay 9 to turn off, and the coil 59c of the solenoid valve 59 receives a current. Stop flowing. Then, the solenoid valve 59 moves to the position 59a, and the supply of hydraulic oil to the direction switching valve 54 is stopped. When the supply of the hydraulic oil to the direction switching valve 54 is stopped, the upper revolving structure is set in the "turning prohibition mode" in which the upper revolving structure cannot turn.

A prohibition flag is stored in the RAM 16. The prohibition flag is set to a value corresponding to the state of the transistor 8 that is on / off controlled each time the turning prohibition switch 4 is turned on, that is, the current mode of the upper swing body, and is stored in the RAM 16. ing. For example, when the transistor 8 is controlled to be turned on based on the operation of the turning prohibition switch 4, the prohibition flag is set to "1", and when the transistor 8 is controlled to be turned off, the prohibition flag is set to "0". It is set and stored. Further, when the transistor 8 is controlled to be turned on, the upper revolving structure is in a "revolving mode" in which the upper revolving structure is capable of revolving, and when the transistor 8 is controlled to be in an off state, the upper revolving structure is not revolving. Has become. Therefore, when the prohibition flag is "0", it is possible to determine that the upper swing body is in the "turning prohibition mode", and when the prohibition flag is "1", the upper swing body is in the "turning mode".

The RAM 16 also stores a time count value (hereinafter, simply referred to as a count value) for measuring the above-mentioned mode switching time. As the count value, a value corresponding to a preset predetermined time (about 10 to 20 minutes) is set (timer set). The count value is decremented by 1 by the CPU 3 every predetermined time (timer count).
Further, the count value is reset (timer reset) to a value corresponding to a predetermined time while the CPU 3 is counting the timer. When the count value becomes "0" (time-up), the CPU 3 determines that the mode switching time has elapsed, and sets the "turn prohibition mode" as described above.

When the driving power supply Vcc is supplied from the constant voltage circuit 2 based on the operation of the starter switch 1, the CPU 3 executes steps (hereinafter, the step is simply referred to as S) based on the flow chart of the control program shown in FIG. 1 to
The process of S17 is executed.

That is, the CPU 3 performs the initial setting process in S1. That is, the CPU 3 sets the prohibition flag to “0” and stores it in the RAM 16. Further, the CPU 3
RAM by setting the count value to the specified mode switching time
Store in 16.

Next, in S2, the CPU 3 controls the transistor 8 to be turned off to set the "turning prohibition mode". Further, in S3, the CPU 3 causes the transistor 1
2 is turned on to turn on the LED 14. And
CPU3 moves to S4.

At S4, the CPU 3 causes the input port I
Based on the signal input from 1, it is determined whether or not the turning prohibition switch 4 is operated. Turn prohibition switch 4
When is not operated, an H level signal is input to the CPU 3. CPU based on the H level signal
3 judges that the turning prohibition switch 4 has not been operated and S
Move to 5.

In S5, the CPU 3 determines the state of the transistor 8 based on the prohibition flag stored in the RAM 16. When the prohibition flag is "0", the CPU3
Determines that the transistor 8 is off, and if the inhibition flag is "1", the CPU 3 determines that the transistor 8 is on. Then, the CPU 3 proceeds to S6 when the transistor 8 is on, and returns to S4 when the transistor 8 is off. The transistor 8 is on / off controlled based on the operation of the turning prohibition switch 4.

That is, the CPU 3 waits until the turning prohibiting switch 4 is operated in S4 and S5. At this time, when the turning prohibition switch 4 is operated, the CPU 3 detects the operation of the turning prohibition switch 4, and S4 to S10.
Move to.

In S10, the CPU 3 determines the state of the transistor 8 based on the prohibition flag stored in the RAM 16 as in S5. When the CPU 3 starts executing the process according to the operation of the starter switch 1, S2
In, the transistor 8 is controlled to be off and the prohibition flag is "0".
To S11.

In S11, the CPU 3 outputs an H level signal from the output port O1 to control the transistor 8 to be turned on. When the transistor 8 is controlled to be turned on, a current flows through the coil portion 10 of the relay 9 to turn on the contact portion, and a current flows through the coil 59c of the solenoid valve 59. As a result, the solenoid valve 59 is set to the position 59b, the hydraulic oil is supplied from the oil pump 53 to the direction switching valve 54, and the upper swing body is turned to the "turning mode".

Next, in S12, the CPU 3 outputs an L level signal from the output port O2 to output the transistor 1
Control 2 off. When the transistor 12 is controlled to be turned off, no current flows in the LED 14, so LE
D14 is turned off.

Further, in S13, the CPU 3 performs "timer setting" for setting a predetermined mode switching time to the count value of the RAM 16. And CPU3 is S
14, the prohibition flag is set to "1" and the RAM
Store in 16. Then, when the storage in the RAM 16 is completed, the CPU 3 returns to S4.

That is, the CPU 3 sets the upper revolving structure in the "revolving mode" and turns off the LED 14 in the processes of S11 to S14. Therefore, the operator can determine that the turning operation of the upper-part turning body is possible by operating the turning prohibition switch 4 and confirming that the LED 14 is turned off. Therefore, the turning operation can be reliably performed.

In S4 again, the CPU 3 detects the operation state of the turning prohibition switch 4. At this time, when the turning prohibition switch 4 is operated again, the CPU 3 causes the CPU 3 to move from S4 to S4.
Move to 10.

Then, the CPU 3 determines in S10 whether or not the prohibition flag is "1". At this time, the prohibition flag is set to "1" in the processes of S11 to S14. Therefore, the CPU 3 causes S10 to S15.
Move to.

In S15, the CPU 3 outputs an L level signal from the output port O1 to control the transistor 8 to be off. When the transistor 8 is controlled to be off, no current flows in the coil part 10 of the relay 9, so that the contact part is turned off and a current flows in the coil 59c of the solenoid valve 59. As a result, the solenoid valve 59 is set to the position 59a, the hydraulic oil is not supplied from the oil pump 53 to the direction switching valve 54, and the upper swing body is in the "turning prohibition mode" in which the turning is impossible.

Next, in S16, the CPU 3 outputs an H level signal from the output port O2 and outputs the signal from the transistor 1
Control 2 on. When the transistor 12 is controlled to be turned on, a current flows through the LED 14, so that the LED 14 lights up.

Further, in S17, the CPU 3 sets the prohibition flag to "0" and stores it in the RAM 16. When the storage in the RAM 16 is completed, the CPU 3 executes S
Return to 4.

By the way, in the upper swing body, the transistor 8 is turned on and set in the "turning mode" in S11, and the transistor 8 is turned off in S15 and set in the "turning prohibition mode". And S11
And S15 are executed alternately each time the turning prohibition switch 4 is operated. Therefore, the upper swing body is alternately set to the "turning mode" and the "turning prohibition mode" each time the turning prohibition switch 4 is operated.

The LED 14 is turned off by turning off the transistor 12 in S12, and turned on by turning on the transistor 12 in S16.
Therefore, the LED 14 is alternately turned on and off each time the turning prohibition switch 4 is operated. Further, the prohibition flag is set to "1" in S14 and "0" in S17. Therefore, the prohibition flag is also set to “1” and “0” alternately each time the turning prohibition switch 4 is operated.

On the other hand, when the turning prohibition switch 4 is not operated in S4, the CPU 3 moves from S4 to S5. In S5, the CPU 3 determines whether the prohibition flag is "0" or "1". In S14, the prohibition flag is set to "1" and stored in the RAM 16. Therefore, the CPU 3 moves from S5 to S6.

In S6, the CPU 3 performs "timer counting" of the counter stored in the RAM 16, and then proceeds to S7. In S7, the CPU 3 determines whether the count value is "time up". Then, if it is not the "time up", the CPU 3 moves to S8.

At S8, the CPU 3 determines the input port I
The state of the operation detection switch 6 is judged on the basis of the signal input from 2. At this time, if the operation detection switch 6 is turned on based on the operation of the turning operation lever 55, the CPU 3 detects the on state of the operation detection switch 6. Then, the CPU 3 shifts from S8 to S9,
The timer is reset to reset the counter to a value corresponding to the predetermined time, and the process returns to S4. And the CPU 3
In S6, the timer is counted from the value corresponding to the reset predetermined time.

On the other hand, if the turning operation lever 55 is not operated in S8, that is, if the operation detection switch 6 is off, the CPU 3 returns from S8 to S4. And CPU3
Continues the timer count in S6. That is,
In the processing of S6 to S9, the CPU 3 detects whether or not the turning operation lever 55 has been operated within the predetermined time set or reset to the count value. Then, the turning operation lever 5
When the CPU 5 is not operated within the predetermined time, the CPU 3
The process moves from S8 to S15, and the processes of S15 to S17 are executed.

That is, when the turning operation lever 55 is not operated within the predetermined time, the CPU 3 sets the upper turning body to the "turning prohibition mode", turns on the LED 14, and sets the prohibition flag to "0". Then, when the processing ends, the CPU 3 returns to S4 again. Therefore, even if the operator forgets to operate the turning prohibition switch 4,
It is possible to reliably set the "turning prohibition mode" after a lapse of a predetermined time. Conversely, since the "turning prohibition mode" can be set without operating the turning prohibition switch 4, the operator does not have to operate the turning prohibition switch 4 to set the "turning prohibition mode". You can

As described above, according to this embodiment, a return type switch is used as the turning prohibiting switch 4, and the operation of the turning prohibiting switch 4 is detected by the CPU 3. CPU3
Each time the turning prohibiting switch 4 is operated, the transistor 8 is alternately turned on / off to switch between a "driving mode" in which the upper revolving structure can turn and a "non-driving mode" in which the upper turning body cannot turn. did. Further, the CPU 3 turns on the transistor 12 each time the turning prohibition switch 4 is operated.
The off control is performed to turn off the LED 14 in the “driving mode” and turn on the LED 14 in the “non-driving mode”. As a result, the operator can determine that the turning operation of the upper-part turning body is possible by operating the turning prohibition switch 4 and confirming that the LED 14 is turned off, so that the turning operation is reliably performed. be able to.

Further, the CPU 3 has a turning operation lever 55
By connecting the operation detection switch 6 which is turned on only when is operated, it is possible to detect whether or not the turning operation lever 55 is operated. If the turning operation lever 55 is not operated within a predetermined time after the turning prohibition switch 4 is operated to set the "drive mode", the CPU 3
Controls the transistor 8 to be turned off so as to switch to the "non-driving mode" in which the upper swing body cannot swing. As a result, even when the operator forgets to operate the turning prohibition switch 4, the "turning prohibition mode" can be reliably performed after a predetermined time has elapsed.
Can be

The present invention may be modified as follows, and in that case, the same operation and effect can be obtained. 1) In the above embodiment, the hydraulic circuit 50 for rotating the hydraulic motor 58 is used, but the hydraulic circuit for driving the hydraulic cylinders for the excavation and suspension arms may be applied. Further, it may be applied to other construction machines such as a bulltozer.

2) In the above embodiment, the turning prohibiting switch 4 is a return type switch which is turned on while being operated, but a return type switch which is normally energized and turned off while being operated is used. You may carry out using.

The turning prohibiting switch 4 may be of any type, and may be a push button type, a lever type or the like. 3) In the above embodiment, the transistors 8 and 12 are NPs.
Although an N transistor is used, a PNP transistor may be used.

4) In the above embodiment, the light emitting diode (L
Although the ED) 14 is used to display the current mode of the upper swing body, a lamp may be used to display the current mode.

5) In the above embodiment, the LED 14 is turned off in the "turning mode" and the LED is turned on in the "turning prohibited mode" to notify the operator of the current mode. LED to be turned on when is and LED to be turned on in "turn prohibition mode"
You may implement by providing and. At this time, the emission color of each LED may be changed and implemented.

Further, a display element such as an LCD (liquid crystal display element) may be used to display the current mode by characters or colors. Further, a buzzer may be provided so that the buzzer sounds in one mode, for example, the "turning prohibition mode" to notify the current mode.

6) In the above embodiment, the CPU 3 is the RAM
The predetermined time is measured by the count value stored in 16, and the "turning prohibition mode" is set when the turning operation lever 55 is not operated within the predetermined time.
Alternatively, a timer circuit may be provided to measure the predetermined time by the timer circuit. Alternatively, a timer circuit may be connected to the CPU 3 and the timer circuit may measure a predetermined time.

7) In the above-described embodiment, the oil pump 53 is driven to rotate by the prime mover 52, but the oil pump 53 may be driven to rotate by an electric motor. Although the respective embodiments of the present invention have been described above, the technical idea other than the claims that can be understood from the respective embodiments,
The effects are described below.

A) The hydraulic circuit control device according to any one of claims 1 to 3 is provided with display means 12 to 14 for displaying the non-driving mode and the driving mode. With this configuration, the mode of the upper swing body can be easily confirmed.

(B) In the hydraulic circuit control device according to any one of claims 1 to 3, the hydraulic device is the hydraulic motor 58 when the upper revolving structure rotatably supported by the lower traveling structure is revolved. The upper revolving structure is revolved by switching the direction in which the hydraulic oil is supplied based on the operation of the lever 55 and rotationally driving the hydraulic motor 58. With this configuration,
The swinging motion of the upper swing body can be easily performed.

C) In the hydraulic circuit control device according to any one of claims 1 to 3, the control means includes an electromagnetic valve 59, a relay 9 connected in series to the coil 59c of the electromagnetic valve 59, and the relay 9. And a transistor 8 for on / off control. With this configuration, it is possible to easily supply / stop the hydraulic oil.

[0073]

As described above in detail, according to the invention described in claim 1, it is possible to provide a control device capable of switching modes by a simple operation. In addition, claim 2
According to the inventions described in to 4, it is possible to provide the control device of the hydraulic circuit that can supply / stop the hydraulic oil by a simple operation.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hydraulic circuit control device according to an embodiment.

FIG. 2 is a flowchart showing a process of a control device of a hydraulic circuit.

FIG. 3 is a schematic configuration diagram of a conventional hydraulic circuit control device.

[Explanation of symbols]

3 ... Microcomputer (CPU) as detecting means, switching means, judging means, measuring means, 4 ... Turning prohibition switch as return type switch, 6 ... Operation detecting switch as operation detecting means, 8 ... As switching means Transistor, 9 ... Relay as switching means, 55 ... Operating lever,
58 ... A hydraulic motor as a hydraulic device, 59 ... A solenoid valve as a switching means.

Claims (3)

[Claims] 1. A drive mode in which a hydraulic device (58) is driven with respect to a hydraulic circuit including a hydraulic device (58) driven by hydraulic oil supplied based on an operation of an operating lever (55). And a control device of a hydraulic circuit for switching control to a non-driving mode in which the hydraulic device (58) is not driven by operating the operation lever (55), the return type switch (4) and the return type switch (4). Based on the detection result of the detecting means (3) and the detecting means (3), ON / OFF control is alternately performed every time the resettable switch (4) is operated, and ON control is performed. If the hydraulic device (58)
To a drive mode, and a switching means (3, 8, 9, 59) for controlling the hydraulic device (58) to a non-drive mode when it is controlled to off. 2. The control device for a hydraulic circuit according to claim 1, wherein an operation detection means (6) for detecting an operation of the operation lever (55) and a detection result of the operation detection means (6) are used. , A judgment means (3) for judging whether or not the operation lever (55) is operated within a predetermined time after the reset type switch (4) is operated, and a judgment result of the judgment means (3). Based on the above, when the operation lever (55) is not operated within a predetermined time, a hydraulic pressure provided with a switching means (3, 8, 9, 59) for switching the hydraulic device (58) to a non-driving mode. Circuit control device. 3. The hydraulic circuit control device according to claim 1, wherein a measuring means for measuring a time after at least one of the reset switch (4) and the operation lever (55) is operated ( 3), operation detecting means (6) for detecting an operation of the operation lever (55), and after the return type switch (4) is operated based on the detection result of the operation detecting means (6), Judging means (3) for judging whether or not the operation lever (55) has been operated by the measuring means (3) before a predetermined time has elapsed.
And the return type switch (4) and the operation lever (55) based on the detection result of the operation detecting means (3), the measurement result of the measuring means (3), and the judgment result of the judging means (3). When the operation lever (55) is not operated within a predetermined time after at least one of them has been operated, the switching means (3, 8, 9,) for switching the hydraulic device (58) to the non-driving mode. 59) and a control device for a hydraulic circuit comprising: