JP2008174986A - Operation control device of work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation control device of a work machine which can prevent the erroneous operation of the work machine, and is operable even if an operator assumes a standing position. <P>SOLUTION: The operating control device 4 of the work machine which can drive a driving mechanism of the work machine when a changeover switch 44 is in an energized location, and sets the driving mechanism in a halting state when the changeover switch is in a non-energized location is provided with a seated state detecting means 45 for detecting whether or not the operator is seated at an operating seat, and a grip detecting means 46 for detecting whether or not an operating portion 3 is gripped by the operator. When the seated state of the operator is detected by the seated state detecting means 45, a control section 43 outputs an electric signal S1 to an energizing path 51. On the other hand, when the non-seated state of the operator is detected by the seated state detecting means 45, and at the same time, the grip of the operating portion 3 by the operator is detected by the grip detecting means 46, the control section 43 outputs an electric signal S2 to a sub-energizing path 52 arranged on the more upstream side of the changeover switch 44 and electrically connected to the energizing path 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an operation control device for a work machine that prevents a drive mechanism from being driven even when an operation unit is moved.

  In a hydraulic working machine such as a hydraulic shovel, the drive mechanism is controlled by adjusting the hydraulic pressure sent from the hydraulic pump to the drive mechanism (actuator or the like) using a hydraulic control valve. The hydraulic control valve described above is a valve that is switched by the pilot pressure sent from the pilot pump, and the pilot pressure is adjusted by switching the pilot valve by an operation unit (operation lever or the like), so that the hydraulic control valve is switched.

  In many cases, a work machine including the operation mechanism configured as described above includes an operation control device that controls the operation mechanism. This operation control device has a configuration in which an electromagnetic switching valve is provided in a pilot pressure path on the discharge side of the pilot pump, and a changeover switch is provided in an energization path for the electromagnetic switching valve. The changeover switch described above is turned on and off by a lock release lever provided on the driver's seat entrance / exit side. According to this operation control device, when the lock release lever is lowered, the changeover switch is turned on to energize the electromagnetic switching valve. The energized electromagnetic switching valve is switched to a state in which the pilot pressure from the pilot pump is supplied to the pilot valve side. For this reason, the pilot pressure from the pilot pump is supplied to the pilot valve via the electromagnetic switching valve, and the drive mechanism is driven according to the operation of the operation unit. On the other hand, when the lock release lever is pulled up, the selector switch is turned off and the energization of the electromagnetic switching valve is stopped. The electromagnetic switching valve that has been de-energized is switched to a state in which the supply of pilot pressure is stopped. For this reason, the pilot pressure is not supplied to the pilot valve, and the work machine does not operate even if the operation unit is moved (see, for example, Patent Document 1).

However, there is a case where an operator who operates the above-described working machine tries to leave the driver's seat without pulling up the lock release lever. At this time, a part of the operator's body may hit the operation unit, and the working machine may malfunction. There is. In order to solve this problem, conventionally, an operation control device provided with a seating sensor for detecting whether an operator is seated in a driver's seat has been proposed. According to this operation control device, the seating sensor detects whether the operator is seated / not seated. When the seating sensor detects the seating, the lock is released even when the unlocking lever is lowered (unlocked state). As a result, malfunction of the work machine can be prevented (see, for example, Patent Documents 2 to 5).
JP-A-11-286966 Japanese Utility Model Publication No.59-160669 Japanese Patent Laid-Open No. 10-30257 Japanese Patent Laid-Open No. 11-314882 JP 2006-241908 A

  However, when operating the work machine, the operator may stand up and try to operate in order to visually recognize the work location or the like. In such a case, the above-described conventional operation control device with a seating sensor has a problem that when the operator stands up, the seating sensor detects a non-sitting state and the work machine is locked.

  The present invention has been made in consideration of the above-described conventional problems, and provides an operation control device for a work machine that can prevent a work machine from malfunctioning and that can be operated even when the operator is standing. It is an object.

  The operation control device for a work machine according to the present invention includes a control unit that outputs an electric signal and a changeover switch provided in an energization path of the electric signal from the control unit, and the changeover switch is in an energization position. An operation control device for a work implement that is capable of driving the drive mechanism of the work implement in accordance with the operation of the operation portion and in which the drive mechanism is stopped even when the operation portion is operated when the changeover switch is in the non-energized position. In the above, a seating detection means for detecting whether or not the operator is seated in the driver's seat and a gripping detection means for detecting whether or not the operation part is gripped by the operator are provided. When the seating state is detected, the control unit outputs an electrical signal to the energization path. When the seating detection unit detects the non-sitting state of the operator, the control unit transmits the electrical signal to the energization path. Is not output, the non-sitting state of the operator is detected by the seating detection means, and the control unit detects that the operator is gripped by the operator by the grip detection means. It is characterized in that an electrical signal is output to a sub energization path electrically connected to the upstream energization path.

  With such a feature, when the seating state of the operator is detected by the seating detection means, an electrical signal is output from the control unit to the energization path. At this time, if the change-over switch is in the energized position, the unlocking state in which the drive mechanism is driven in accordance with the operation of the operation unit is set. On the other hand, when the changeover switch is in the non-energized position, the drive mechanism is locked even if the operation unit is moved.

  In addition, when the non-sitting state of the operator is detected by the seating detection means, no electrical signal is output from the control unit to the energization path, and no electrical signal is sent to the changeover switch side even when the changeover switch is in the energization position. . Thereby, it will be in the locked state where a drive mechanism does not move even if an operation part is moved.

  In addition, even if the non-sitting state of the operator is detected by the seating detection means, an electrical signal is output from the control section to the sub energization path when the grip detection means detects that the operation part is gripped by the operator. . At this time, if the changeover switch is in the energization position, the electrical signal flows through the sub-energization path to reach the energization path upstream of the changeover switch, and flows through the energization path and is sent via the changeover switch. As a result, the work machine is in the unlocked state.

  By the way, the operation control device for a work machine according to the present invention is switched to ON / OFF, and a seating detection release switch that is energized when it is ON and de-energized when it is OFF is in the sub-energization path. It is good also as a structure provided.

  Thus, when the seating detection release switch is ON, the electrical signal output from the control unit to the sub energization path is sent to the changeover switch side via the sub energization path. On the other hand, when the seating detection release switch is OFF, the sub-energization path is interrupted at the seating detection release switch, so that the electrical signal output from the control unit does not flow through the sub-energization path.

  Further, the operation control device for a work machine according to the present invention includes a foot switch that is disposed on the floor in the cab and is energized when it is stepped on by an operator and is de-energized when it is not stepped on. It is good also as a structure provided in.

  Thereby, when the foot switch is stepped on, the electrical signal output from the control unit to the sub-energization path is sent to the changeover switch side via the foot switch. On the other hand, when the foot switch is not stepped on, the sub energization path is interrupted at the foot switch, so that the electrical signal output from the control unit does not flow through the sub energization path.

  Furthermore, the operation control device for a work machine according to the present invention is mounted on a work machine having a plurality of operation units, and at least two of the plurality of operation units are gripped by the operator by the grip detection means. When the non-sitting state is detected by the seating detection means, and when it is detected that two or more operation parts are gripped by the grip detection means, the control unit electrically A configuration may be employed in which a signal is output.

  As a result, when it is detected that two or more operation units are gripped by the operator, an electric signal is output from the control unit to the sub-energization path. On the other hand, even if it is detected that only one operation unit is gripped by the operator, an electrical signal is not output from the control unit to the sub energization path.

Further, in the operation control device for a work machine according to the present invention, when the changeover switch is in the non-energized position, an electric signal from the control unit is energized to the engine start relay and the engine can be started.
When the change-over switch is in the energization position, the engine start relay may be stopped so that the engine cannot be started.

  As a result, when the engine is started and the changeover switch is in the energized position, even if an electrical signal is output from the control unit, the electrical signal is not energized to the engine start relay, and the engine is not started. On the other hand, when an electric signal is output from the control unit when the changeover switch is in the non-energized position, the electric signal is supplied to the engine start relay, and the engine can be started. When the engine can be started, the drive mechanism does not move even if the operation unit is moved because the changeover switch is in the non-energized position.

  According to the operation control device for a work implement according to claim 1 of the present invention, the lock is released when the operator leaves the driver's seat with the lock released, and the work implement is driven even if the operation unit is moved. Since the mechanism is not driven, it is possible to prevent malfunction of the work machine. Further, even if the operator stands up, if the operator holds the operation unit, the operator can operate the work machine in a standing posture because the operator is not locked and remains unlocked. .

  According to the operation control device for a work machine according to claim 2 of the present invention, when the operator tries to drive in a standing posture, the operator not only grasps the operation unit but also turns on the seating detection release switch. Must be. That is, when the seating detection release switch is OFF, the electrical signal output from the control unit to the sub-energization path is not sent to the changeover switch side. For this reason, when the operator stands up with the seating detection release switch OFF, the work implement is locked. Thereby, the malfunctioning of a working machine can be prevented more reliably.

  According to the operation control device for a work machine according to claim 3 of the present invention, when the operator tries to drive in a standing posture, the operator must not step on the foot switch but also step on the foot switch. Don't be. That is, unless the foot switch is stepped on, the electrical signal output from the control unit to the sub-energization path is not sent to the changeover switch side. For this reason, when the operator stands up with his foot off the foot switch, the work implement is locked. Thereby, the malfunctioning of a working machine can be prevented more reliably.

  According to the operation control device for a work machine according to claim 4 of the present invention, when operating in a standing posture, the unlocked state is not achieved unless the operator holds two or more operation parts with both hands. That is, when the operator gets on and off the vehicle, even if the operator unconsciously grasps one operation unit, an electric signal is not sent from the control unit to the sub-energization path, and the work implement is locked. Thereby, the malfunctioning of a working machine can be prevented more reliably.

  According to the operation control device for a work implement according to claim 5 of the present invention, when the engine is started, the engine does not start unless the changeover switch is in the non-energized position. Therefore, the work implement moves unexpectedly immediately after the engine is started. This can prevent the malfunction of the work machine.

  Embodiments of an operation control device for a work machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the inside of a cab 1 of a working machine such as a hydraulic shovel, FIG. 2 is a circuit diagram showing an operation control device 4, and FIG. 3 is a flowchart showing functions of the operation control device 4. is there.

First, the internal configuration of the work machine cab 1 will be briefly described.
As shown in FIG. 1, in the cab 1, a driver's seat 2 on which an operator sits, an operation unit 3 that the operator operates to move the work implement, and the work implement does not move even if the operation unit 3 is moved. And a hydraulic lock lever 41 of the operation control device 4 that locks to the position. The operation unit 3 includes operation levers 31 and 32 in front of the driver's seat 2 for operating the traveling body of the work implement, operation levers 33 and 34 on both sides of the driver's seat 2 for operating an arm of the work implement, and the driver's seat. 2 and operation pedals 35 and 36 provided on the front floor. The hydraulic lock lever 41 is a lever that is disposed on the entrance / exit side of the cab 1 and is manually raised and lowered by the operator.

Next, a hydraulic circuit of a working machine that is moved by operating the operation unit 3 will be briefly described.
The drive mechanism of the work machine is driven by the hydraulic pressure sent from the main hydraulic pump. The hydraulic pressure sent to the drive mechanism is controlled by the hydraulic control valve provided in the hydraulic pressure circuit, and the drive of the drive mechanism is controlled. The The hydraulic control valve is a pilot operated valve that is switched by a pilot pressure. The pilot pressure is pumped by the pilot pump 10 shown in FIG. 2, and is sent to the hydraulic control valve via the pilot valve 11 (operation valve) shown in FIG. The pilot valve 11 is a valve that is switched by operating the operation unit 3. By switching the pilot valve 11 by the operation unit 3, the pilot pressure sent to the hydraulic control valve is adjusted, the hydraulic control valve is switched, and the drive of the drive mechanism is controlled.

Next, the configuration of the operation control device 4 will be described.
As shown in FIG. 2, the operation control device 4 includes a hydraulic lock solenoid 42 (electromagnetic switching valve), a controller 43 (control unit), a changeover switch 44, a seating sensor 45 (sitting detection means), and a touch sensor. 46 (gripping detection means), a seating sensor release switch 47 (a seating detection release switch), and a foot switch 48 are provided.

  The hydraulic lock solenoid 42 is a three-port, two-position electromagnetic switching valve that is switched between a supply stop position A and a supply position B, and is provided in a pilot pressure supply passage 12 that connects the pilot pump 10 and the pilot valve 11. Yes. When the hydraulic lock solenoid 42 is in the supply stop position A, the port connected to the pilot pump 10 is closed, and the port connected to the pilot valve 11 and the port connected to the tank 13 are communicated. As a result, the supply flow path 12 is blocked at the hydraulic lock solenoid 42, and the pilot pressure from the pilot pump 10 is not sent to the pilot valve 11. On the other hand, when the hydraulic lock solenoid 42 is at the supply position B, the port connected to the tank 13 is closed, and the port connected to the pilot pump 10 and the port connected to the pilot valve 11 are communicated. Thereby, the pilot pressure from the pilot pump 10 is guided to the pilot valve 11. The hydraulic lock solenoid 42 is an electromagnetic switching valve having a supply stop position A as a basic position. When the solenoid is not energized, the hydraulic lock solenoid 42 is stationary at the supply stop position A. When the solenoid is energized, the spool is It is moved and switched to the supply position B.

  The controller 43 is electrically connected to the hydraulic lock solenoid 42 via the energization path 51. The controller 43 is electrically connected to the energization path 51 via the sub energization path 52. The sub energization path 52 is connected to a portion 51 a on the upstream side of the changeover switch 44 described later, that is, near the controller 43 in the energization path 51. The controller 43 supplies the hydraulic lock release output S1 (electric signal) for switching the hydraulic lock solenoid 42 at the supply stop position A to the supply position B in the energization path 51 or the hydraulic lock release output S2 (electric signal) in the sub-energization path. 52 is output.

  The changeover switch 44 is a changeover switch that is switched between the energization position C and the non-energization position D, and is provided in the energization path 51 from the controller 43 to the hydraulic lock solenoid 42. When the changeover switch 44 is in the energization position C, the terminal on the controller 43 side is connected to the terminal on the hydraulic lock solenoid 42 side. As a result, the hydraulic lock release output S1 (or S2) from the controller 43 side is energized to the hydraulic lock solenoid 42 side. On the other hand, when the changeover switch 44 is in the non-energized position D, the terminal on the controller 43 side is connected to the terminal on the neutral start relay 20 side. As a result, the hydraulic lock release output S1 (or S2) from the controller 43 side is energized to the neutral start relay 20 side without being energized to the hydraulic lock solenoid 42 side. The neutral start relay 20 (engine start relay) is a relay that opens and closes an electric circuit that starts the engine by an electric signal. The changeover switch 44 is a switch that is changed over by the hydraulic lock lever 41 shown in FIG. 1. When the hydraulic lock lever 41 is in the horizontal state, the changeover switch 44 is in the energization position C and the hydraulic lock lever 41 is in the downward state. At this time, the changeover switch 44 is in the non-energized position D.

  The seating sensor 45 is a sensor that detects whether or not the operator is seated in the driver's seat 2 shown in FIG. As the seating sensor 45, for example, there is a pressure sensor installed in the seat portion of the driver's seat 2. Thus, when the operator is seated in the driver's seat 2, pressure is applied to the pressure sensor by the operator's weight, so that the seating state can be detected. Conversely, if the operator is not seated in the driver's seat 2, the pressure sensor Since no pressure is applied, the non-sitting state can be detected. The seating sensor 45 is electrically connected to the controller 43, and when the seating sensor 45 detects the seating, an electrical signal S3 is sent to the controller 43.

  The touch sensor 46 is a sensor that detects whether or not the operation levers 33 and 34 on both sides of the driver's seat 2 are gripped by the operator. For example, a touch sensor for detecting capacitance is installed on the head portions (portions held by the operator) of the operation levers 33 and 34. As a result, when the operator grips the operation levers 33 and 34, the detected capacitance increases, so that it can be detected that the operation levers 33 and 34 are gripped by the operator. If the operation levers 33 and 34 are not gripped, the detected capacitance is small, so that it is possible to detect that the operation levers 33 and 34 are not gripped by the operator. As shown in FIG. 1, the touch sensor 46 is installed on both operation levers 33 and 34 on both sides. Further, the touch sensor 46 is electrically connected to the controller 43, and an electric signal S4 is sent to the controller 43 when it is detected that the touch sensors 46, 46 on both sides are gripped. Even if it is detected that only one of the two touch sensors 46, 46 is being gripped, the electrical signal S4 is not sent to the controller 43.

  The seating sensor release switch 47 is a switch that is switched ON / OFF. For example, a switch that is switched ON / OFF by rotating a knob can be used. Although not shown, the seating sensor release switch 47 is installed inside the cab 1 shown in FIG. 1 and is manually switched by an operator. The seating sensor release switch 47 is provided in the sub energization path 52 and is energized / de-energized according to ON / OFF. That is, when the seating sensor release switch 47 is ON, the hydraulic lock release output S2 from the controller 43 side is energized to the changeover switch 44 side. On the other hand, when the seating sensor release switch 47 is OFF, the sub energization path 52 is blocked at the seating sensor release switch 47, and the hydraulic lock release output S <b> 2 from the controller 43 does not flow to the sub energization path 52.

  The foot switch 48 is a changeover switch that can be switched between an energization position E and a non-energization position F, and is provided in the sub-energization path 52. When the foot switch 48 is in the energization position E, the hydraulic lock release output S2 from the controller 43 side is energized to the changeover switch 44 side. On the other hand, when the foot switch 48 is in the non-energized position F, the sub energization path 52 is interrupted at the foot switch 48, and the hydraulic lock release output S <b> 2 from the controller 43 does not flow into the sub energization path 52. The foot switch 48 is installed on the floor in the cab 1 as shown in FIG. 1 and is covered with an openable hinged cover 49. The foot switch 48 has a non-energized position F as a basic position, and switches to the energized position E when the operator steps on his / her foot, and switches to the non-energized position F when the operator removes his / her foot.

Next, functions of the operation control device 4 having the above-described configuration will be described.
As shown in FIG. 3, first, before the engine is started, seating / non-sitting is detected by the seating sensor 45. When non-seating is detected by the seating sensor 45, the electrical signal S3 is not sent from the seating sensor 45 to the controller 43, and the hydraulic lock release output S1 is not output from the controller 43. When seating is detected by the seating sensor 45, an electrical signal S3 is sent from the seating sensor 45 to the controller 43, and a hydraulic lock release output S1 is output from the controller 43 to the energization path 51.

  Even if the hydraulic lock release output S1 is output to the energization path 51, the engine cannot be started when the hydraulic lock lever 41 is in the horizontal state and the changeover switch 44 is in the energization position C. When the hydraulic lock lever 41 is in the downward state and the changeover switch 44 is in the non-energized position D, the hydraulic lock release output S1 output to the energization path 51 goes to the neutral start relay 20, so that the engine can be started.

  On the other hand, seating / non-sitting is detected by the seating sensor 45 even during operation of the engine. When seating is detected by the seating sensor 45, an electrical signal S3 is sent from the seating sensor 45 to the controller 43, and a hydraulic lock release output S1 is output from the controller 43 to the energization path 51. Even if the hydraulic lock release output S1 is output to the energization path 51, the hydraulic lock release output S1 is sent to the hydraulic lock solenoid 42 side when the hydraulic lock lever 41 is in the downward state (the changeover switch 44 is in the non-energized position D). The hydraulic lock solenoid 42 is in the supply stop position A. On the contrary, when the hydraulic lock lever 41 is in the horizontal state (the changeover switch 44 is in the energization position C), the hydraulic lock release output S1 output to the energization path 51 is sent to the hydraulic lock solenoid 42 side, and the hydraulic lock solenoid 42 is supplied. It becomes position B.

  Further, when non-seating is detected by the seating sensor 45 during operation of the engine, it is detected by the touch sensor 46 whether or not the operation levers 33 and 34 on both sides are gripped. When it is detected that both the operation levers 33 and 34 on both sides are not grasped or only one of the operation levers 33 (34) is grasped, an electric signal S4 is sent from the touch sensor 46 to the controller 43. The hydraulic lock release output S2 is not output from the controller 43. When it is detected by the touch sensor 46 that the operation levers 33 and 34 on both sides are grasped, an electrical signal S4 is sent from the touch sensor 46 to the controller 43, and the hydraulic lock is released from the controller 43 to the sub energization path 52. Output S2 is output.

Even if the hydraulic unlocking output S2 is output to the sub energization path 52, when the seating sensor release switch 47 is OFF, the seating sensor release switch 47 cannot be energized, and the hydraulic lock release output S2 does not flow. On the contrary, when the seating sensor release switch 47 is ON, the seating sensor release switch 47 can be energized.
Even when the seating sensor release switch 47 is ON, if the foot switch 48 is not depressed, the foot switch 48 cannot be energized and the hydraulic lock release output S2 does not flow. On the contrary, when the foot switch 48 is stepped on, the seating sensor release switch 47 can be energized.
Further, even when the seating sensor release switch 47 is ON and the foot switch 48 is stepped on, when the hydraulic lock lever 41 is in the downward state (the changeover switch 44 is in the non-energized position D), the hydraulic lock is released. The output S2 is not sent to the hydraulic lock solenoid 42 side, and the hydraulic lock solenoid 42 is in the supply stop position A. On the contrary, when the hydraulic lock lever 41 is in the horizontal state (the changeover switch 44 is in the energization position C), the hydraulic lock release output S2 output to the energization path 51 is sent to the hydraulic lock solenoid 42 side, and the hydraulic lock solenoid 42 is supplied. It becomes position B.

  According to the operation control device 4 having the above-described configuration, when the operator tries to start the engine of the work machine, if the operator is not seated in the driver's seat 2, an electrical signal is sent from the seating sensor 45 to the controller 43. Since the controller 43 does not output an electrical signal to the energization path 51, the engine cannot be started. Further, when the operator tries to start the engine, if the changeover switch 44 is in the energized position C with the hydraulic lock lever 41 facing downward, the electric signal does not go to the neutral start relay 20 and the engine starts. Can not. That is, when trying to start the engine, the engine does not start unless the operator is seated in the driver's seat 2 and the hydraulic lock lever 41 is in the downward state (the changeover switch 44 is in the non-energized position D). It is possible to prevent the work machine from moving unexpectedly after starting, and to prevent malfunction of the work machine.

  Further, if the operator stands up to get off from the cab 1 while releasing the hydraulic lock lever 41 while the engine is running, the electrical signal S3 is not sent from the seating sensor 45 to the controller 43, so that the controller 43 enters the energization path 51. The hydraulic lock release output S1 is not output. For this reason, the hydraulic lock solenoid 42 is in the supply stop position A, and the drive mechanism of the work implement is not driven even when the operation unit 3 is moved. Thereby, malfunction of a working machine can be prevented.

  Further, even when the operator stands up with the hydraulic lock lever 41 released while the engine is running, if the operator holds the operation levers 33 and 34 on both sides with both hands, an electrical signal is sent from the touch sensor 46 to the controller 43. S4 is sent, and the hydraulic lock release output S2 is output from the controller 43 to the sub-energization path 52. When the seating sensor release switch 47 is ON and the operator is stepping on the foot switch 48 with his / her foot, the hydraulic lock release output S2 output to the sub energization path 52 is the seating sensor release switch 47 and the foot switch 48. And the changeover switch 44 are sequentially sent to the hydraulic lock solenoid 42. For this reason, the hydraulic lock solenoid 42 becomes the supply position B and enters the unlocked state. Thereby, the operator can drive the work machine in a standing posture.

Further, if the seating sensor release switch 47 is turned OFF, even if the hydraulic lock release output S2 is output from the controller 43 to the sub energization path 52, the hydraulic lock release output S2 may be supplied to the hydraulic lock solenoid 42. Therefore, if the seating sensor release switch 47 is switched ON only when the operator tries to drive in a standing posture, the malfunction of the work implement can be prevented more reliably.
Also, when the operator stands up to get off while the engine is running, even if he forgets to lower the hydraulic lock lever 41 and unconsciously touches the operation levers 33 and 34, it will lock unless the foot switch 48 is depressed. It becomes a state. Thereby, the malfunctioning of a working machine can be prevented more reliably.
Further, when the operator stands up to get off while the engine is running, even if he forgets to lower the hydraulic lock lever 41 and unintentionally touches one of the operation levers 33 (34), the operation levers 33, 34 on both sides If it is not touched, it will be locked. Thereby, the malfunctioning of a working machine can be prevented more reliably.

  As mentioned above, although embodiment of the operation control apparatus of the working machine which concerns on this invention was described, this invention is not limited to above-described embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the above-described embodiment, the sub energization path 52 is provided with the seating sensor release switch 47 (seat detection release switch) and the foot switch 48. However, the present invention provides a seating detection release switch, a foot switch, It is also possible to adopt a configuration in which both or either of them is not provided.

  In the above-described embodiment, when it is detected that the touch sensors 46 are respectively installed on the operation levers 33 and 34 on both sides of the driver's seat 2 and the operation levers 33 and 34 on both sides are gripped, An electrical signal S4 is sent to the controller 43, and a hydraulic lock release output S2 is output from the controller 43 to the sub-energization path 52. In the present invention, either one of the operation levers 33 (34) is gripped. In this case, the controller 43 can output the hydraulic lock release output S2 to the sub energization path 52. In the above-described embodiment, the touch sensor 46 is installed on the operation levers 33 and 34 on both sides of the driver's seat 2, but the present invention is not limited to other operation units (for example, the front operation levers 31 and 32). Alternatively, the touch sensor 46 may be installed on the operation pedals 35 and 36).

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

It is a perspective view inside the cab of the working machine for demonstrating embodiment of the operation control apparatus of the working machine which concerns on this invention. It is a circuit diagram of the operation control device for explaining an embodiment of the operation control device of the work implement concerning the present invention. It is a flowchart figure showing the function of the operation control apparatus for demonstrating embodiment of the operation control apparatus of the working machine which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cab 2 Driver's seat 3 Operation part 4 Operation control apparatus 11 Pilot valve (operation valve)
12 Supply flow path 20 Neutral start relay (Engine start relay)
33, 34 Operation lever 43 Controller (control unit)
44 changeover switch 45 seating sensor (sitting detection means)
46 Touch sensor (grip detection means)
47 Seating sensor release switch (Sitting detection release switch)
48 Foot switch 51 Energization path 52 Sub energization path C Energization position D Non-energization position S1, S2 Hydraulic lock release output (electric signal)

Claims (5)

A control unit that outputs an electrical signal; and a selector switch provided in an energization path of the electrical signal from the control unit,
When the changeover switch is in the energized position, the drive mechanism of the work implement can be driven according to the operation of the operation unit, and when the changeover switch is in the non-energized position, the drive mechanism is in the stopped state even if the operation unit is operated. In the operation control device of the work machine to be
Seat detection means for detecting whether the operator is seated in the driver's seat and grip detection means for detecting whether the operation unit is gripped by the operator,
When the sitting state of the operator is detected by the seating detection unit, the control unit outputs an electrical signal to the energization path, and when the non-sitting state of the operator is detected by the seating detection unit, the control unit Do not output electrical signals to the current path,
When the non-sitting state of the operator is detected by the seating detection means, and when it is detected by the grip detection means that the operation unit is gripped by the operator, the control unit is connected to the energization path upstream of the changeover switch. An operation control device for a work machine, characterized in that an electrical signal is output to a sub-energization path electrically connected to the machine. In the operation control device for the work machine according to claim 1,
Operation control of a work machine characterized in that a seating detection release switch that is switched to ON / OFF and is energized when it is ON and de-energized when it is OFF is provided in the sub-energization path apparatus. In the operation control device of the work machine according to claim 1 or 2,
A foot switch is provided on the floor in the cab, and is provided in a sub-energization path with a foot switch that is energized when it is stepped on by an operator and not energized. Operation control device. In the operation control apparatus of the working machine according to any one of claims 1 to 3,
It is mounted on a work machine with multiple operation units,
The grip detection means detects whether or not at least two of the plurality of operation units are gripped by the operator,
When the non-sitting state is detected by the seating detection means, and when it is detected by the grip detection means that two or more operation parts are being gripped, an electrical signal is output from the control part to the sub-energization path. An operation control device for a working machine. In the operation control apparatus of the working machine according to any one of claims 1 to 4,
When the changeover switch is in the non-energized position, an electric signal from the control unit is energized to the engine start relay, and the engine can be started.
An operation control device for a working machine, wherein when the changeover switch is in an energized position, energization of an electric signal to an engine start relay is stopped and the engine cannot be started.

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