JP6604982B2 - Excavator - Google Patents

Description

  The present invention relates to a hydraulic excavator capable of excavation work and crane work.

  In general, a hydraulic excavator includes a lower traveling body, an upper revolving body provided on the upper side of the lower traveling body, and an upper revolving body connected to the upper revolving body, and a boom, an arm, and a bucket for excavation work. And an articulated working device. Further, the hydraulic excavator includes an engine, a hydraulic pump driven by the engine, and a boom cylinder, an arm cylinder, and a bucket cylinder that are driven by pressure oil from the hydraulic pump to rotate the boom, the arm, and the bucket, respectively. And.

  Also, in the cab of the upper swing body in the hydraulic excavator, a key switch for instructing start and stop of the engine and the like are provided at the entrance / exit of the cab, and the entry / exit position (up position) and the entry / exit restriction position (down) The gate lock lever operated to the position), and when this gate lock lever is operated to the entry / exit restriction position, the drive of a plurality of actuators including a boom cylinder, an arm cylinder, and a bucket cylinder is permitted. And a lock device that prohibits driving of a plurality of actuators when operated to the boarding / alighting permission position.

  The hydraulic excavator described above is known not only for excavation work but also for crane work (see, for example, Patent Document 1). The hydraulic excavator of Patent Document 1 includes a crane working hook provided at the tip of an arm of a working device, a mode switch provided in a cab and selecting one of an excavation mode and a crane mode, and this mode. And a controller that calculates the actual load of the load lifted using the hook when the crane mode is selected by the switch.

  The controller uses the boom rotation angle detected by the boom angle sensor, the arm rotation angle detected by the arm angle sensor, and the boom cylinder rod side pressure and bottom side pressure detected by the pressure sensor. The actual load of the lifted load is calculated using. Then, the controller determines whether or not the calculated actual load exceeds a reference value (specifically, the rated load or a value set in advance so as to be smaller than the rated load), and when this determination is affirmed A signal for operating an alarm lamp and an alarm buzzer in the cab is output to generate an alarm. Accordingly, the driver can sufficiently recognize that the actual load has exceeded the reference value.

Japanese Patent Laid-Open No. 2004-076351 (refer to FIGS. 1 to 4 in particular)

  By the way, the hydraulic excavator can interrupt the crane work in a suspended load state using a hook. More specifically, the driver can get out of the driver's cab by operating the gate lock lever to the entry / exit permission position with the hydraulic excavator suspended and the engine operated. It is also possible for the driver to get out of the cab by operating the gate lock lever to the entry / exit permission position after stopping the engine by operating the key switch to the OFF position with the hydraulic excavator suspended. is there.

  However, when in a suspended load state, care must be taken not to put anything under the suspended load. For this reason, it is desirable that the crane operation is not interrupted as much as possible in the suspended load state. In other words, it is better to leave the excavator after unloading.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a hydraulic excavator capable of calling attention so as not to interrupt crane work in a suspended load state.

  In order to achieve the above object, the present invention provides a lower traveling body, an upper revolving body provided on the upper side of the lower traveling body, and a pivot, an arm, and excavation work connected to the upper revolving body. An articulated working device having a bucket and a crane working hook, a prime mover, a hydraulic pump driven by the prime mover, driven by pressure oil from the hydraulic pump, the boom, the arm, and A boom cylinder, an arm cylinder, and a bucket cylinder that respectively rotate the bucket, a prime mover switch that is provided in an operating room of the upper swing body, and that instructs to start and stop the prime mover, and an entrance / exit of the operating room A gate lock lever provided and operated to a boarding / alighting permission position and a boarding / alighting restriction position; The plurality of actuators including the boom cylinder, the arm cylinder, and the bucket cylinder are allowed to be driven, and the plurality of actuators are prohibited from being driven when the gate lock lever is operated to the entry / exit permission position. A locking device that is provided in the cab, a mode selection device that selects one of an excavation mode and a crane mode, an arm angle sensor that detects a rotation angle of the arm, and a rotation angle of the boom. A boom angle sensor to detect, a pressure sensor to detect a rod side pressure and a bottom side pressure of the boom cylinder, and when the crane mode is selected by the mode selection device, the arm angle sensor, the boom angle sensor, And based on the detection result of the pressure sensor, it was lifted using the hook A first alarm device that determines whether or not the actual load exceeds a reference value set in advance based on the rated load, and issues a first alarm when this determination is affirmed. In the hydraulic excavator provided, when the crane mode is selected by the detection device for detecting the operation position of the gate lock lever and the mode selection device, it is in a suspended load state using the hook and the gate lock lever is moved on and off. A second alarm device that determines whether or not the permitted position has been operated and issues a second alarm when the determination is affirmative.

  According to the present invention, attention can be urged so as not to interrupt the crane work in a suspended load state.

It is a side view showing the structure of the hydraulic shovel in the 1st Embodiment of this invention. It is a hydraulic circuit diagram showing the structure regarding the drive of a boom cylinder as a representative among the structures of the hydraulic drive device of the hydraulic shovel in the 1st Embodiment of this invention. It is a block diagram showing the structure of the control system of the hydraulic shovel in the 1st Embodiment of this invention. It is a flowchart showing the processing content of the crane work interruption warning control of the display apparatus in the 1st Embodiment of this invention. It is a block diagram showing the structure of the control system of the hydraulic shovel in the 2nd Embodiment of this invention. It is a flowchart showing the processing content of the crane work interruption warning control of the display apparatus in the 2nd Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the structure of a hydraulic excavator in the present embodiment. In the following, with the excavator in the state shown in FIG. 1, the front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (front side of the page in FIG. 1) of the driver seated in the driver's seat Side) and right side (back side toward the paper surface in FIG. 1) are simply referred to as front side, rear side, left side, and right side.

  The hydraulic excavator of the present embodiment includes a crawler-type lower traveling body 1, an upper revolving body 2 provided on the upper side of the lower traveling body 1, and an articulated working device connected to the upper revolving body 2. 3 is provided. The lower traveling body 1 travels while being rotationally driven by left and right traveling motors (not shown). The upper swing body 2 is driven to rotate by a swing motor (not shown) and swings.

  The upper swing body 2 includes a swing frame 4 that forms a foundation structure, a cab-type cab 5 provided on the front left side of the swing frame 4, and devices mounted on the swing frame 4 (details will be described later). And an exterior cover 8 that covers the engine 6 and the hydraulic pump 7 shown in FIG.

  The work device 3 includes a boom 9 that is pivotally connected to the revolving frame 4, an arm 10 that is pivotally connected to the tip of the boom 9, and an arm 10 that is vertically movable to the tip of the arm 10. And a bucket 11 for excavation work connected in a rotatable manner in the direction. The boom 9, the arm 10, and the bucket 11 are rotated by the expansion and contraction drive of the boom cylinder 12, the arm cylinder 13, and the bucket cylinder 14, respectively. A hook 16 for crane work (that is, for suspending a load 15 for example) is provided at the tip of the arm 10.

  An arm angle sensor 17 that detects a rotation angle of the arm 10 with respect to the boom 9 is attached to the base end portion of the arm 10. A boom angle sensor 18 that detects the rotation angle of the boom 9 relative to the revolving frame 4 is attached to the base end portion of the boom 9. Pressure sensors 19A and 19B for detecting respective internal pressures are attached to the rod side (upper side in FIG. 1) oil chamber and the bottom (lower side in FIG. 1) oil chamber of the boom cylinder 12. The detection results of the arm angle sensor 17, the boom angle sensor 18, and the pressure sensors 19A and 19B are output to the vehicle body controller 20 (see FIG. 3 described later).

  The driver's cab 5 is provided with a driver's seat (not shown) on which the driver is seated. On the front side of the driver's seat, a traveling operation device (not shown) for instructing driving of the left and right traveling motors is provided. On the left side of the driver's seat, a cross operation type operation device for operation (not shown) for instructing driving of the turning motor and driving of the arm cylinder 13 is provided. On the right side of the driver's seat, a cross operation type operation operating device 21 (see FIG. 2 described later) for instructing driving of the boom cylinder 12 and driving of the bucket cylinder 14 is provided.

  On the left side of the driver's seat (in other words, the entrance / exit of the driver's cab 5), there are a gate lock lever 22 (see FIG. 2 described later) operated to a boarding / alighting permission position and a boarding / alighting restriction position, and an operation position of the gate lock lever 22 A lock switch 23 (see FIGS. 2 and 3 to be described later) for detection is provided. The gate lock lever 22 allows the driver to get on and off when operated to the boarding / alighting permission position (up position), and prevents the driver from getting on and off when operated at the boarding / alighting restriction position (down position). Yes.

  A key switch 24 (see FIG. 3 described later) is provided on the right side of the driver seat, and a display device 25 (see FIG. 3 described later) is provided on the front right side of the driver seat. The key switch 24 enables the key to be inserted / removed, and instructs to start / stop the engine 6 in accordance with the rotation operation of the key. Specifically, when the key is operated from the OFF position to the ON position, the power supply of a plurality of electrical components including the vehicle body controller 20, the display device 25, and the engine controller 26 (see FIG. 3 described later) is instructed. When operated from the ON position to the START position, the start of the engine 6 is instructed. Thereafter, when the driver releases the key, the key automatically returns from the START position to the ON position. In addition, when the key is operated from the ON position to the OFF position, the engine 6 is stopped and the power-off of a plurality of electrical components is instructed.

  Next, a hydraulic drive device for a hydraulic excavator according to the present embodiment will be described. FIG. 2 is a hydraulic circuit diagram showing a configuration related to driving of the boom cylinder 12 as a representative of the configurations of the hydraulic drive device of the hydraulic excavator in the present embodiment.

  The hydraulic drive device according to the present embodiment includes an engine 6, a hydraulic pump 7 and a pilot pump 27 driven by the engine 6, and a hydraulic pilot type direction switching that controls the flow of pressure oil from the hydraulic pump 7 to the boom cylinder 12. A valve 28 and a work operation device 21 are provided.

  The work operating device 21 is a pilot that generates pilot pressure by reducing the discharge pressure of the pilot pump 27 set by the pilot relief valve 27a according to the operation amount of the operation lever 29 and the front side from the neutral position of the operation lever 29. It has a valve 30A and a pilot valve 30B that generates a pilot pressure by reducing the discharge pressure of the pilot pump 27 according to the operation amount on the rear side from the neutral position of the operation lever 29.

  When the operation lever 29 is operated from the neutral position to the front side, the pilot pressure generated by the pilot valve 30A according to the operation amount is output to the pressure receiving portion 31A of the direction switching valve 28, whereby the direction switching valve 28 is It is switched to the middle right switching position. Thereby, the boom cylinder 12 is shortened. Further, when the operation lever 29 is operated from the neutral position to the rear side, the pilot pressure generated by the pilot valve 30B according to the operation amount is output to the pressure receiving portion 31B of the direction switching valve 28, whereby the direction switching valve 28 is It is switched to the switching position on the left side in the figure. Thereby, the boom cylinder 12 is extended.

  The configuration related to driving of other actuators (specifically, the arm cylinder 13 and the bucket cylinder 14) is similar to the configuration related to driving of the boom cylinder 12. That is, the corresponding direction switching valve is switched by the pilot pressure from the corresponding operation device, and the other actuator is driven by the pressure oil from the hydraulic pump 7 supplied through this direction switching valve.

  A lock valve 32 is provided in the discharge oil passage of the pilot pump 27, and the lock valve 32 is switched according to the operation of the gate lock lever 22 described above. More specifically, when the gate lock lever 22 is operated to the boarding / alighting restriction position (lowering position, in other words, unlocking position) and the lock switch 23 becomes a closed contact, the solenoid portion 33 of the lock valve 32 via the lock switch 23. Is energized, and the lock valve 32 is switched to the switching position on the left side in the figure. As a result, the discharge oil passage of the pilot pump 27 is in a communicating state, and the discharge pressure of the pilot pump 27 is introduced into a plurality of operation devices including the work operation device 21. Therefore, driving of a plurality of actuators including the boom cylinder 12 is permitted.

  On the other hand, when the gate lock lever 22 is operated to the boarding / leaving permission position (up position, in other words, the lock position) and the lock switch 23 is opened, the solenoid portion 33 of the lock valve 32 is not energized and the spring 34 is attached. The lock valve 32 is switched to the switching position on the right side in the figure by the force. As a result, the discharge oil passage of the pilot pump 27 is cut off. Therefore, driving of a plurality of actuators including the boom cylinder 12 is prohibited.

  Next, the control system of the hydraulic excavator of this embodiment will be described. FIG. 3 is a block diagram showing the configuration of the control system of the hydraulic excavator in the present embodiment.

  The control system of this embodiment includes a battery 35, a key switch 24, a vehicle body controller 20, a display device 25, an engine controller 26, and the like. The vehicle body controller 20, the display device 25, and the engine controller 26 are communicably connected to each other via a CAN (Controller Area Network).

  The key switch 24 has a B terminal, an ACC terminal, and a C terminal, and is configured so that connection of the B terminal, the ACC terminal, and the C terminal is switched according to the operation position. Specifically, when the key switch 24 is operated to the OFF position, the B terminal, the ACC terminal, and the C terminal are not connected to each other. When the key switch 24 is operated to the ON position, the B terminal and the ACC terminal are connected to each other. When the key switch 24 is operated to the START position, the B terminal, the ACC terminal, and the C terminal are connected to each other.

  The B terminal of the key switch 24 is connected to the battery 35 together with the display device 25 and the engine controller 26. The ACC terminal of the key switch 24 is connected to the vehicle body controller 20, the display device 25, the engine controller 26, and other electrical components (not shown). The C terminal of the key switch 24 is connected to the engine controller 26.

  When the key switch 24 is operated from the OFF position to the START position or the ON position, the vehicle body controller 20, the display device 25, and the engine controller 26 are turned on. When the key switch 24 is operated from the START position or the ON position to the OFF position, the power source of the vehicle body controller 20 is immediately turned off. In addition, the display device 25 turns off its own power supply immediately or after performing the processing described later, and turns off its own power supply after the engine controller 26 stops the engine 6.

  The display device 25 is provided in the cab 5 as described above, and includes the control unit 36, the mode switch 37, the mode lamp 38, the monitor 39, and the buzzer 40. The mode switch 37 selects one of the excavation mode and the crane mode by the operation of the driver, and outputs a selection signal to the control unit 36. The control unit 36 determines whether or not the crane mode is selected based on the selection signal from the mode switch 37 and transmits the determination result to the vehicle body controller 20. In addition, when the crane mode is selected by the mode switch 37, the control unit 36 lights the mode lamp 38 and the rotating lamp 41. On the other hand, when the excavation mode is selected by the mode switch 37, the control unit 36 rotates the mode lamp 38 and the rotating lamp 41. The lamp 41 is turned off. The rotating lamp 41 is provided outside the cab 5 of the upper swing body 2.

  The vehicle body controller 20 includes a calculation unit 42 and a determination unit 43. When the crane mode is selected by the mode switch 37, the calculation unit 42 determines the position of the load 15 lifted using the hook 16 based on the detection results of the arm angle sensor 17, the boom angle sensor 18, and the pressure sensors 19A and 19B. And the actual load is calculated. More specifically, the holding force moment of the boom cylinder 12 is calculated from the rod side pressure and the bottom side pressure of the boom cylinder 12 detected by the pressure sensors 19A and 19B. Further, the moment of the working device 3 and the position of the load 15 are calculated from the rotation angle of the arm 10 and the rotation angle of the boom 9 detected by the arm angle sensor 17 and the boom angle sensor 18. The difference between the calculated holding force moment of the boom cylinder 12 and the moment of the working device 3 becomes the moment of the load 15, and the actual load of the load 15 is calculated from the moment of the load 15. The calculation unit 42 outputs the calculated actual load of the load 15 to the determination unit 43 and transmits the calculated position and actual load of the load 15 to the display device 25.

  The determination unit 43 of the vehicle body controller 20 determines the rated load (in other words, the maximum load of a load that can be lifted using the hook 16) and a reference value set in advance based on the rated load (specifically, for example, the rated load 95%). And it is determined whether the actual load calculated in the calculating part 42 exceeded the reference value, and the determination result is transmitted to the display apparatus 25 with a rated load.

  When the crane mode is selected by the mode switch 37, the control unit 36 of the display device 25 displays the position, actual load, and rated load of the load 15 received from the vehicle body controller 20 on the monitor 39. Further, when the determination unit 43 of the vehicle body controller 20 determines that the actual load exceeds the reference value, the buzzer 40 is sounded.

  Further, the control unit 36 of the display device 25 determines whether or not the gate lock lever 22 has been operated to the entry / exit permission position based on the signal from the lock switch 23 regardless of whether or not the crane mode is selected with the mode switch 37. And the determination result is transmitted to the engine controller 26.

  The engine controller 26 determines whether or not the key switch 24 has been operated to the START position based on a signal from the C terminal of the key switch 24. When the gate lock lever 22 is operated to the boarding / alighting permission position and the key switch 24 is operated to the START position, the engine 6 is started.

  Further, the engine controller 26 determines whether or not the key switch 24 has been operated to the OFF position based on a signal from the ACC terminal of the key switch 24. When the key switch 24 is operated to the OFF position, the engine 6 is stopped. Then, its own power is turned off.

  Here, as a major feature of the present embodiment, when the crane mode is selected by the mode switch 37, the control unit 36 of the display device 25 determines whether the actual load of the load 15 received from the vehicle body controller 20 is equal to or greater than a predetermined threshold value. By determining whether or not, it is determined whether or not it is a suspended load state using the hook 16. Further, as described above, based on the signal from the lock switch 23, it is determined whether or not the gate lock lever 22 has been operated to the entry / exit permission position. Further, based on the signal from the ACC terminal of the key switch 24, it is determined whether or not the key switch 24 has been operated to the OFF position. Based on these determination results, it is determined whether or not the crane operation is interrupted in the suspended load state. And when it determines with the crane operation having been suspended with the suspended load state, the monitor 39 and the buzzer 40 are controlled and a warning is given. That is, a warning is displayed on the monitor 39 and the buzzer 40 is sounded. The processing procedure of such crane work interruption alarm control will be described with reference to FIG.

  FIG. 4 is a flowchart showing the processing contents of the crane work interruption alarm control of the display device 25 in the present embodiment. This control is started after the engine 6 is started and the gate lock lever 22 is operated to the boarding / alighting restriction position.

  First, in step S50, the control unit 36 of the display device 25 determines whether or not the crane mode is selected with the mode switch 37. When the excavation mode is selected with the mode switch 37, the determination in step S50 is negative (NO), and the process proceeds to step S51. In step S51, the control unit 36 determines whether or not the key switch 24 has been operated to the OFF position. If the key switch 24 is not operated to the OFF position, the determination in step S51 is negative (NO), and the process returns to the above-described step S50 to repeat the same procedure as described above. On the other hand, if the key switch 24 is operated to the OFF position, the determination in step S51 is affirmed (YES), and the present control ends.

  When the crane mode is selected with the mode switch 37 in step S50, the determination is affirmed (YES), and the process proceeds to step S52. In step S52, the control unit 36 determines whether or not it is in a suspended load state. If it is not in the suspended load state, the determination in step S52 is negative (NO), the process proceeds to step S51 described above, and the same procedure is repeated. On the other hand, when it is in a suspended load state, the determination in step S52 is affirmed (YES), and the process proceeds to step S53. In step S53, the control unit 36 determines whether or not the key switch 24 has been operated to the OFF position. If the key switch 24 is not operated to the OFF position, the determination in step S53 is negative (NO), and the process proceeds to step S54.

  In step S54, the control unit 36 determines whether or not the gate lock lever 22 has been operated to the entry / exit permission position. When the gate lock lever 22 is operated to the boarding / alighting restriction position, the determination in step S54 is negative (NO), the process proceeds to step S50 described above, and the same procedure is repeated. On the other hand, when the gate lock lever 22 is operated to the boarding / alighting permission position, the determination in step S54 is affirmed (YES), and the process proceeds to step S55.

  In step S55, the control unit 36 controls the monitor 39 and the buzzer 40 to activate an alarm. That is, a warning is displayed on the monitor 39 and the buzzer 40 is sounded. And it progresses to step S56 and the control part 36 determines whether warning time has reached the regulation time. If the alarm time has not reached the specified time, the determination in step S56 is negative (NO), and the process proceeds to step S57. In step S57, the control unit 36 determines whether or not the suspended load state has been eliminated. If the suspended load state has not been resolved, the determination in step S57 is negative (NO), and the process returns to the above-described step S50 to repeat the same procedure as described above.

  If the alarm in step S55 is repeated and the alarm time reaches the specified time in step S56, the determination is affirmed (YES), and the process proceeds to step S58. Moreover, when the suspended load state is eliminated in step S57, the determination is affirmed (YES), and the process proceeds to step S58. In step S58, the control unit 36 controls the monitor 39 and the buzzer 40 to stop the alarm. And it returns to above-mentioned step S50 and repeats the same procedure as the above.

  If the key switch 24 is operated to the OFF position in step S53, the determination is affirmed (YES), and the process proceeds to step S59. In step S59, the controller 36 controls the monitor 39 and the buzzer 40 to activate the alarm for a specified time. And this control is complete | finished.

  In the above description, the engine 6 constitutes the prime mover described in the claims, and the key switch 24 constitutes a prime mover switch that issues a start instruction and a stop instruction for the prime mover. The lock valve 32 permits driving of a plurality of actuators including a boom cylinder, an arm cylinder, and a bucket cylinder when the gate lock lever is operated to the entry / exit restriction position, while the gate lock lever is operated to the entry / exit permission position. In this case, a lock device is configured to prohibit driving of the plurality of actuators.

  The mode switch 37 constitutes a mode selection device that selects one of the excavation mode and the crane mode. The calculation unit 42 and the determination unit 43 of the vehicle body controller 20, the control unit 36 and the buzzer 40 of the display device 25 detect the arm angle sensor, the boom angle sensor, and the pressure sensor when the crane mode is selected by the mode selection device. Based on the result, the actual load of the load lifted using the hook is calculated, it is determined whether or not the actual load has exceeded the reference value set in advance based on the rated load, and if this determination is affirmed 1st alarm device which issues 1 alarm is comprised.

  The lock switch 23 constitutes a detection device that detects the operation position of the gate lock lever. The control unit 36 (see steps S50, S52, S54, and S55 of FIG. 4), the monitor 39, and the buzzer 40 of the display device 25 are in a suspended state using a hook when the crane mode is selected by the mode selection device. It is determined whether or not the gate lock lever is operated to the boarding / alighting permission position, and a second alarm device is configured to issue a second alarm when this determination is affirmed.

  Further, the control unit 36 (see steps S50, S52, S53, and S59 in FIG. 4), the monitor 39, and the buzzer 40 of the display device 25 are suspended using a hook when the mode selection device selects the crane mode. It is further determined whether or not an instruction to stop the prime mover has been issued by the prime mover switch, and a second alarm device is configured to issue a third alarm when this determination is affirmed.

  Next, the operation and effect of this embodiment will be described.

  The driver can suspend the crane operation while being in a suspended load state using the hook 16. That is, the driver can get out of the cab 5 by operating the gate lock lever 22 to the entry / exit permission position, for example, without stopping the engine 6 in the suspended state. In this case, the process proceeds to step S55 via steps S50 and S52 to S54 of FIG. 4 described above, and the monitor 39 and the buzzer 40 of the display device 25 in the cab 5 issue an alarm. Alternatively, for example, the driver can operate the key switch 24 to the OFF position to stop the engine 6 and then operate the gate lock lever 22 to the entry / exit permission position to get out of the cab 5. In this case, the process proceeds to step S59 via steps S50, S52, and S53 of FIG. 4 described above, and the monitor 39 and the buzzer 40 of the display device 25 in the cab 5 issue an alarm.

  Therefore, it is possible to call attention so as not to interrupt the crane work in a suspended load state.

  A second embodiment of the present invention will be described with reference to FIGS. Note that in this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  FIG. 5 is a block diagram showing the configuration of the control system of the hydraulic excavator in the present embodiment.

  In this embodiment, as a prime mover switch, a push switch 44 is provided on the right side of the driver's seat instead of the key switch 24. An ACC relay 45 is provided between the vehicle body controller 20, the engine controller 26, and other electrical components and the battery 35. A C relay 46 is provided between the engine controller 26 and the battery 35.

  The push switch 44 outputs an instruction signal by the pressing operation. Specifically, if the engine 6 is in a stopped state and the power of a plurality of electrical components including the vehicle body controller 20, the display device 25, and the engine controller 26 is in an off state, the power of the plurality of electrical components is turned on. An instruction signal to be switched (hereinafter referred to as an ON instruction signal for convenience) is output. Further, if the engine 6 is in a stopped state and a plurality of electrical components are powered on, an instruction signal for starting the engine 6 (hereinafter referred to as a START instruction signal for convenience) is output. If the engine 6 is in a driving state and the power of a plurality of electrical components is on, the engine 6 is stopped and an instruction signal for switching the power of the plurality of electrical components to an off state (hereinafter referred to as OFF for convenience). (Referred to as an instruction signal).

  When the ON instruction signal for the push switch 44 is input, the control unit 36A of the display device 25 switches the power supply of the display device 25 to the on state. Further, the contacts of the ACC relay 45 are switched to the closed state, and the power supplies of the vehicle body controller 20, the engine controller 26, and other electrical components are switched to the on state.

When the START instruction signal of the push switch 44 is input, the control unit 36A of the display device 25 validates or invalidates the START instruction signal of the push switch 44 according to a condition. More specifically, when it is determined that the gate lock lever 22 has been operated to the entry / exit permission position, the START instruction signal of the push switch 44 is validated. That, C the contact of the relay 4 6 temporarily switched to the closed state, to output the signal from the C relay 4 6 to the engine controller 26. In response to this signal, the engine controller 26 starts the engine 6.

On the other hand, if it is determined that the gate lock lever 22 has been operated to the boarding / exiting restriction position, the START instruction signal of the push switch 44 is invalidated. That is, the left contact points C relay 4 6 in the open state.

  When the OFF instruction signal for the push switch 44 is input, the control unit 36A of the display device 25 enables or disables the OFF instruction signal for the push switch 44 depending on the condition. More specifically, when the excavation mode is selected by the mode switch 37, the OFF instruction signal of the push switch 44 is validated. That is, the power supply of the display device 25 is switched to the off state. Further, the contact of the ACC relay 45 is switched to the open state. Thereby, the power supplies of the vehicle body controller 20 and other electrical components are switched to the off state. Further, in response to switching of the ACC relay 45, the engine controller 26 stops the engine 6 and then turns off its own power supply.

  Further, when the crane mode is selected by the mode switch 37 and the suspended state is not established, the OFF instruction signal of the push switch 44 is validated while the crane mode is selected by the mode switch 37 and the suspended load is activated. In the state, the OFF instruction signal of the push switch 44 is invalidated.

  Further, as in the first embodiment, the control unit 36A of the display device 25 determines whether or not the crane work is interrupted in the suspended load state. And when it determines with the crane operation having been suspended with the suspended load state, the monitor 39 and the buzzer 40 are controlled and a warning is given. That is, a warning is displayed on the monitor 39 and the buzzer 40 is sounded. The processing procedure of such crane work interruption alarm control will be described with reference to FIG.

  FIG. 6 is a flowchart showing the processing contents of the crane work interruption alarm control of the display device 25 in the present embodiment. This control is started after the engine 6 is started and the gate lock lever 22 is operated to the boarding / alighting restriction position.

  First, in step S60, the control unit 36A of the display device 25 determines whether or not the crane mode is selected by the mode switch 37. When the excavation mode is selected with the mode switch 37, the determination in step S60 is negative (NO), and the process proceeds to step S61. In step S61, the control unit 36A determines whether an OFF instruction signal for the push switch 44 has been input. When the OFF instruction signal of the push switch 44 is not input, the determination in step S61 is negative (NO), and the process returns to the above-described step S60 to repeat the same procedure as described above. On the other hand, for example, when an OFF instruction signal of the push switch 44 is input, the determination in step S61 is affirmed (YES), and the process proceeds to stop control in step S62.

  In the stop control in step S62, the control unit 36A of the display device 25 switches the power supply of the display device 25 to the off state. Further, the contact of the ACC relay 45 is switched to the open state. Thereby, the power supplies of the vehicle body controller 20 and other electrical components are switched to the off state. Further, in response to switching of the ACC relay 45, the engine controller 26 stops the engine 6, and then turns off its own power supply. And this control is complete | finished.

  When the crane mode is selected with the mode switch 37 in step 60, the determination is affirmed (YES), and the process proceeds to step S63. In Step S63, control part 36A judges whether it is in a suspended load state. If it is not in the suspended load state, the determination in step S63 is negative (NO), the process proceeds to step S61 described above, and the same procedure is repeated. On the other hand, when it is in a suspended load state, the determination in step S63 is affirmed (YES), and the process proceeds to step S64.

  In step S64, the control unit 36A determines whether or not an OFF instruction signal for the push switch 44 has been input. When the OFF instruction signal of the push switch 44 is not input, the determination in step S64 is negative (NO), and the process proceeds to step S65. In step S65, the control unit 36A determines whether or not the gate lock lever 22 has been operated to the entry / exit permission position. When the gate lock lever 22 is operated to the boarding / alighting restriction position, the determination in step S65 is negative (NO), the process returns to step S60, and the same procedure is repeated. On the other hand, when the gate lock lever 22 is operated to the boarding / alighting permission position, the determination in step S65 is affirmed (YES), and the process proceeds to step S66.

  In step S66, the control unit 36A controls the monitor 39 and the buzzer 40 to activate an alarm. That is, a warning is displayed on the monitor 39 and the buzzer 40 is sounded. And it progresses to step S67 and 36 A of control parts determine whether alarm time has reached regulation time. If the alarm time has not reached the specified time, the determination in step S67 is negative (NO), and the process proceeds to step S68. In step S68, the control unit 36A determines whether or not the suspended load state has been eliminated. If the suspended load state has not been resolved, the determination in step S68 is negative (NO), the process returns to step S60 described above, and the same procedure is repeated.

  When the alarm in step S66 is repeated and the alarm time reaches the specified time in step S67, the determination is affirmed (YES), and the process proceeds to step S69. Moreover, when the suspended load state is eliminated in step S68, the determination is affirmed (YES), and the process proceeds to step S69. In step S69, the control unit 36A controls the monitor 39 and the buzzer 40 to stop the alarm. And it returns to above-mentioned step S60 and repeats the same procedure as the above.

  If an OFF instruction signal for the push switch 44 is input in step S64, the determination is affirmed (YES), and the process proceeds to step S70. In step S70, the control unit 36A controls the monitor 39 and the buzzer 40 to activate an alarm. And it progresses to step S67 and 36 A of control parts determine whether alarm time has reached regulation time. If the alarm time has not reached the specified time, the determination in step S67 is negative (NO), and the process proceeds to step S68. In step S68, the control unit 36A determines whether or not the suspended load state has been eliminated. If the suspended load state has not been resolved, the determination in step S68 is negative (NO), the process returns to step S60 described above, and the same procedure is repeated.

  When the alarm in step S70 is repeated and the alarm time reaches the specified time in step S67, the determination is affirmed (YES), and the process proceeds to step S69. Moreover, when the suspended load state is eliminated in step S68, the determination is affirmed (YES), and the process proceeds to step S69. In step S69, the control unit 36A controls the monitor 39 and the buzzer 40 to stop the alarm. And it returns to above-mentioned step S60 and repeats the same procedure as the above.

  In the above, the control unit 36A of the display device 25 (see steps S60, S63, S65, and S66 in FIG. 6), the monitor 39, and the buzzer 40 use hooks when the crane mode is selected by the mode selection device. The second alarm device is configured to determine whether or not the gate lock lever is operated to the boarding / alighting permission position and the second alarm is issued when the determination is affirmed. In addition, the control unit 36A (see steps S60, S63, S64, and S70 in FIG. 6), the monitor 39, and the buzzer 40 of the display device 25 are suspended using a hook when the mode selection device selects the crane mode. It is further determined whether or not an instruction to stop the prime mover has been issued by the prime mover switch, and a second alarm device is configured to issue a third alarm when this determination is affirmed.

  Next, the operation and effect of this embodiment will be described.

  The driver can interrupt the crane operation while being in a suspended load state. That is, the driver can get off the cab 5 by operating the gate lock lever 22 to the boarding / alighting permission position, for example, without intending to stop the engine 6 in the suspended state. In this case, the process proceeds to step S66 via steps S60 and S63 to S65 in FIG. 6 described above, and the monitor 39 and the buzzer 40 of the display device 25 in the cab 5 issue an alarm. Alternatively, the driver can operate the push switch 44 with the intention of stopping the engine 6, for example, and then operate the gate lock lever 22 to the entry / exit permission position to get out of the cab 5. In this case, the process proceeds to step S70 via steps S60, S63, and S64 of FIG. 6 described above, and the monitor 39 and the buzzer 40 of the display device 25 in the cab 5 issue an alarm. Further, since the process does not proceed to step S62 in FIG. 6 described above, the engine 6 does not stop.

  Therefore, it is possible to call attention so as not to interrupt the crane work in a suspended load state.

  In the first and second embodiments, the case where the alarms in steps S55 and S59 in FIG. 4 and the alarms in steps S66 and S70 in FIG. 6 are the warning display on the monitor 39 and the sound of the buzzer 40 has been described as an example. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention. That is, the alarms in steps S55 and S59 in FIG. 4 and steps S66 and S70 in FIG. 6 may be, for example, only the warning display of the monitor 39 or only the sound of the buzzer 40. Or you may add the sound of the horn provided outside the cab 5 of the upper revolving structure 2. In addition, when the gate lock lever 22 is operated to the boarding / alighting permission position (step S55 or S66) and when the engine 6 is instructed to stop (step S59 or S70), the type of alarm (that is, the alarm or the alarm) The method may be different.

  In the first and second embodiments, when the crane mode is selected by the mode switch 37, whether or not the crane is in a suspended load state using the hook 16 and the gate lock lever 22 is operated to the entry / exit permission position. When the crane mode is selected with the mode switch 37, the key switch 24 or the push switch 44 is in a suspended load state when the crane mode is selected by the mode switch 37. It has been described by way of example that it has a second function for determining whether or not the engine 6 has been instructed to stop, and issuing an alarm when this determination is affirmed, but the present invention is not limited to this. Further, modifications can be made without departing from the technical idea. That is, although it has the first function described above, it does not have to have the second function described above.

  In the first and second embodiments, the control unit 36 of the display device 25 determines whether or not the actual load calculated by the calculation unit 42 of the vehicle body controller 20 is equal to or greater than a predetermined threshold value. The case where it is determined whether or not it is in a suspended load state using the hook 16 has been described as an example. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention. That is, for example, a camera or the like for photographing the load 15 may be provided, and it may be determined whether or not it is in a suspended load state based on an image of the camera.

  In the first and second embodiments, the vehicle body controller 20 includes the calculation unit 42 and the determination unit 43, and the display device 25 includes the control unit 36 or 36A (in other words, the calculation unit 42 and the determination unit). 43 is configured as a single unit, and the control unit 36 or 36A is configured as a separate body). However, the present invention is not limited to this, and modifications may be made without departing from the spirit and technical idea of the present invention. Is possible. That is, for example, the vehicle body controller 20 may include the calculation unit 42, and the display device 25 may include the determination unit 43 and the control unit 36 or 36 </ b> A (in other words, the determination unit 43 and the control unit 36 or 36 </ b> A are integrally configured. And the calculation unit 42 may be configured as a separate body). For example, the calculating part 42, the determination part 43, and the control part 36 may be comprised integrally, and may each be comprised as a different body.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 3 Working device 5 Operator's cab 6 Engine 7 Hydraulic pump 9 Boom 10 Arm 11 Bucket 12 Boom cylinder 13 Arm cylinder 14 Bucket cylinder 15 Load 16 Hook 17 Arm angle sensor 18 Boom angle sensor 19A, 19B Pressure Sensor 20 Car body controller 22 Gate lock lever 23 Lock switch 24 Key switch 25 Display device 32 Lock valve 36 Control unit 37 Mode switch 39 Monitor 40 Buzzer 42 Calculation unit 43 Judgment unit 44 Push switch

Claims (3)

A lower traveling body, an upper revolving body provided on the upper side of the lower traveling body, and an upper revolving body, coupled to the upper revolving body, having a boom, an arm, a bucket for excavation work, and a crane work hook. Articulated working device, prime mover, hydraulic pump driven by the prime mover, and boom cylinder and arm cylinder driven by pressure oil from the hydraulic pump to rotate the boom, the arm, and the bucket, respectively , And a bucket cylinder, a motor switch provided in a driving room of the upper swing body for instructing start and stop of the motor, and provided at a boarding / alighting opening of the driving room, operated to a boarding / alighting permission position and a boarding / alighting restriction position. When the gate lock lever is operated, and when the gate lock lever is operated to the entry / exit restriction position, A locking device that permits driving of a plurality of actuators including a cylinder and the bucket cylinder, and prohibits driving of the plurality of actuators when the gate lock lever is operated to a boarding / leaving permission position; A mode selection device that is provided and selects one of the excavation mode and the crane mode, an arm angle sensor that detects the rotation angle of the arm, a boom angle sensor that detects the rotation angle of the boom, and the boom Based on the detection results of the pressure sensor that detects the rod side pressure and the bottom side pressure of the cylinder, and the arm angle sensor, the boom angle sensor, and the pressure sensor when the crane mode is selected by the mode selection device The actual load of the load lifted using the hook is calculated, and the actual load is calculated in advance. Determining whether more than a predetermined reference value based on the rated load, the hydraulic excavator having a first and a warning device issues a first alarm if the determination is affirmative,
A detection device for detecting an operation position of the gate lock lever;
When the crane mode is selected by the mode selection device, it is determined whether or not it is in a suspended state using the hook and the gate lock lever is operated to the entry / exit permission position, and this determination is affirmed A hydraulic excavator comprising a second alarm device for issuing a second alarm. The hydraulic excavator according to claim 1,
When the crane mode is selected by the mode selection device, the second alarm device further determines whether the suspension is in a suspended state using the hook and whether the motor is instructed to stop by the motor switch. The hydraulic excavator is characterized by issuing a third alarm when this determination is affirmed. The hydraulic excavator according to claim 2,
The second alarm device, when the crane mode is selected by the mode selection device and is not in a suspended state using the hook, validates the instruction to stop the prime mover by the prime mover switch, while the mode selection A hydraulic excavator that invalidates an instruction to stop the prime mover by the prime mover switch when the crane mode is selected by the apparatus and the crane is in a suspended load state using the hook.

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