Construction machine

Abstract

To provide a construction machine that can draw attention of surrounding workers while suppressing unnecessary alarms when work is not possible.SOLUTION: In a construction machine that is provided with a surrounding detection device that detects people around the vehicle body, an external alarm device that issues alarms around the vehicle body, and a control device that alerts the user by issuing alarms from the external alarm device when the surrounding detection device detects a person, there is a work state switching device that selectively switches the work state of the construction machine between a workable state in which the machine is operable and an unworkable state in which the machine is unable to operate, and when the work state switching device is switched to the workable state and a person is detected by the surrounding detection device, the control device issues alarms by the external alarm device, and when the work state switching device is switched to the unworkable state and a person is detected by the surrounding detection device, the mode of the alarm issued by the external alarm device is changed.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to construction machinery.

Background Art

[0002] Some construction machinery such as a hydraulic excavator detects obstacles such as people or objects existing around the construction machinery to prevent contact accidents, and alerts the operator of the construction machinery and the surrounding workers. For example, what is described in Patent Document 1 is known.

[0003] Patent Document 1 discloses a peripheral monitoring device for a work machine including a notification unit visible from the periphery of the work machine, a work machine state determination means for determining whether the work machine is in an operable state, a human presence determination means for determining the presence or absence of a person around the work machine, a notification unit control means for controlling the notification unit, and a work permission determination means for determining whether to permit the work by the work machine. The notification unit control means sets the notification state of the notification unit to different states when it is determined that the work machine is in an operable state and when it is determined that the work machine is not in an operable state, and the work permission determination means determines whether to permit the work by the work machine based on the determination result of the human presence determination means.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above prior art, the state of the excavator is notified to the surrounding workers by an indicator lamp attached to the outer periphery of the construction machine so that it can be visually recognized by the people around. On the other hand, since the alert by the indicator lamp has limited effect when the operator does not have the construction machine in sight, for example, it is conceivable to separately notify by a loud alarm sound or the like. However, when notifying by an alarm sound or the like, if the warning sound directed to the surrounding workers continues to sound for a long time, it may cause trouble to the neighboring residents, or workers unrelated to the operation of the construction machine may feel bothered.

[0006] The present invention has been made in view of the above, and an object thereof is to provide a construction machine that can alert surrounding workers while suppressing unnecessary alarms in a non-operable state.

Means for Solving the Problems

[0007] This application includes a plurality of means for solving the above problems. For example, a vehicle body, a surrounding detection device provided on the vehicle body for detecting people around the vehicle body, an external alarm device provided on the vehicle body for issuing an alarm to people around the vehicle body, and a control device for alerting by the external alarm device when a person is detected by the surrounding detection device. In a construction machine equipped with, a work state switching device is provided for selectively switching the work state of the construction machine between an operable state in which the work can be performed and a non-operable state in which the work cannot be performed. When the work state switching device is switched to the operable state and a person is detected by the surrounding detection device, the control device executes the alarm by the external alarm device. When the work state switching device is switched to the non-operable state and a person is detected by the surrounding detection device, the mode of the alarm by the external alarm device is changed.

Effects of the Invention

[0008] According to the present invention, it is possible to alert surrounding workers while suppressing unnecessary alarms in a non-operable state.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a hydraulic excavator is shown as an example of construction machinery for explanation, but the present invention can also be applied to other construction machinery such as dump trucks and wheel loaders.

[0011] <The First Embodiment> The first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

[0012] FIG. 1 is a diagram schematically showing the configuration of a hydraulic excavator, which is an example of construction machinery according to this embodiment. Further, FIG. 2 is a functional block diagram showing the functional parts related to surrounding detection among the processing functions of a controller (control device) together with related configurations.

[0013] As shown in Fig. 1, a hydraulic excavator 100, which is a construction machine, includes a crawler-type lower traveling body 3 and an upper revolving body 1 that is rotatably attached to the upper part of the lower traveling body 3 and constitutes the vehicle body of the construction machine together with the lower traveling body 3.

[0014] The lower traveling body 3 is driven by left and right traveling hydraulic motors 3a, 3b (only one is shown in Fig. 1, and the other is shown only by a reference number in parentheses). The upper revolving body 1 is driven by the torque generated by a slewing hydraulic motor (not shown) and slews in the left-right direction with respect to the lower traveling body 3.

[0015] On the front side (for example, the left side) of the upper revolving body 1, a cab 4 for the operator to board is installed. On the side (for example, the right side) of the cab 4 in front of the upper revolving body 1, a multi-joint front working machine 2 for performing formation work such as the target terrain is attached. Note that the direction in which the front working machine 2 of the upper revolving body 1 is installed is defined as the front of the vehicle body.

[0016] The front working machine 2 is configured by connecting a boom 2a, an arm 2b, and a bucket 2c that rotate vertically respectively, and is driven by a boom cylinder 2d, an arm cylinder 2e, and a bucket cylinder 2f respectively.

[0017] At the rear center, the right side, and the left side of the upper revolving body 1, cameras 5a, 5b, 5c for taking images in each direction are installed as surrounding detection devices. Note that as the surrounding detection device, instead of a camera, a LiDAR (Light Detection And Ranging) that detects the position and nature of an object by laser irradiation or a system that detects an RFID (Radio Frequency Identification) tag worn by an operator to identify the position and identity of the operator may be used.

[0018] In addition, on the upper swing body 1, there are arranged a plurality of external warning devices 103 (see FIG. 2) such as a buzzer (for example, outputting a buzzer sound as an alarm) and a speaker (for example, outputting an alarm sound as an alarm) for alerting operators in the vicinity of the hydraulic excavator 100 by outputting an alarm.

[0019] In the cab 4, there is an operation lever (not shown) that generates an operation signal (pilot pressure in the case of a hydraulic drive system) for driving the boom cylinder 2d, arm cylinder 2e, bucket cylinder 2f, swing hydraulic motor (not shown), and travel hydraulic motors 3a, 3b according to the operation direction and operation amount, and operates the boom 2a, arm 2b, bucket 2c, upper swing body 1, and lower travel body 3 by the operation signal, and an internal warning device 102 (see FIG. 2) such as a buzzer (for example, outputting a buzzer sound as an alarm) for alerting by notifying the operator in the cab 4 that an obstacle such as a person or an object has been detected around the hydraulic excavator 100 by outputting an alarm, a touch panel type monitor 104 (see FIG. 2) having a display function for various information to the operator (including functions as a notification device and an alarm device for notifying the operator of the detection of an obstacle) and an input function for various settings by the operator, a working state switching device 101 (for example, a gate lock lever for switching the validity / invalidity of the operation signal output from the operation lever: see FIG. 2) for selectively switching the working state of the hydraulic excavator 100 between a workable state where the operation is possible and a non-workable state where the operation is impossible, and a controller 110 (control device: see FIG. 2) for controlling the overall operation of the hydraulic excavator 100 are arranged.

[0020] In the present embodiment where the hydraulic excavator 100 is exemplified as a construction machine, a gate lock lever is shown as the working state switching device 101. However, in the case of other construction machines such as a dump truck or a wheel loader, for example, a shift lever or a side brake corresponds to the working state switching device.

[0021] As shown in FIG. 2, the controller 110 includes a working state determination unit 111, a detection state determination unit 112, an internal alarm control unit 113, and an external alarm control unit 114.

[0022] The working state determination unit 111 determines whether the working state switching device 101 has been switched to either a workable state or a non-workable state.

[0023] The detection state determination unit 112 determines whether the surrounding detection devices (cameras) 5a, 5b, 5c have detected obstacles such as workers or other objects to be detected within a preset detection range around the hydraulic excavator 100. Note that in this embodiment, the worker is not limited to a person working around the hydraulic excavator 100, and also includes a person passing by the vicinity of the hydraulic excavator 100.

[0024] Based on the determination results of the working state determination unit 111 and the detection state determination unit 112, the internal alarm control unit 113 alerts (warns) the operator by outputting an alarm (for example, an alarm sound) from the internal alarm device 102 installed in the cab 4.

[0025] Based on the determination results of the working state determination unit 111 and the detection state determination unit 112, the external alarm control unit 114 alerts (warns) the workers around the hydraulic excavator 100 by outputting an alarm (for example, an alarm sound) from the external alarm device 103 installed on the upper swing body 1.

[0026] FIGS. 3 and 4 are diagrams showing an example of an alarm sound setting screen.

[0027] The alarm sound setting screen 200 shown in FIGS. 3 and 4 is displayed on the monitor 104 in the driver's cab 4, and is for setting the alarm sound when the alarm from the external alarm device 103 is by an alarm sound. On the alarm sound setting screen 200, there are displayed an enable setting item 201 for switching between enabling and disabling the alarm sound output by the external alarm device 103, and a volume setting item 202 for adjusting the volume of the alarm sound output by the external alarm device 103. The setting input by the operator in the driver's cab 4 to the alarm sound setting screen 200 is sent to the external alarm control unit 114 and reflected in the output of the alarm by the external alarm device 103. Although not shown in the figure, similar to the alarm sound setting screen 200 of the external alarm device 103, on the monitor 104 in the driver's cab 4, there is also displayed an alarm sound setting screen for setting the alarm sound when the alarm from the internal alarm device 102 is by an alarm sound. In the following description, the alarm sound setting screen 200 of the external alarm device 103 will be exemplified for explanation, but the alarm sound setting screen of the internal alarm device 102 also has a similar configuration.

[0028] As shown in FIG. 3, the current setting state (for example, the enabled state) is displayed in the enable setting item 201 of the alarm sound setting screen 200. When switching between enabling and disabling the alarm sound output by the external alarm device 103, the enable setting item 201 is selected and determined by the cursor 203 or the like, and the enable setting screen 210 is displayed. On the enable setting screen 210, there is displayed a slider 211 for selecting whether the setting is enabled or disabled. The setting is determined by selecting the OK button 213 with the slider operated to the desired side, and the determined setting is sent to the external alarm control unit 114. Also, when the cancel button 212 is selected, the selection on the enable setting screen 210 is discarded and the previous setting (here, the enabled state) is maintained. Here, the monitor 104 that displays and operates the alarm sound setting screen 200 having the enable setting item 201 constitutes an external alarm stop device provided in the driver's cab 4 that stops the operation of alerting by the alarm from the external alarm device 103 by the operation of the operator.

[0029] The same applies to the alarm sound setting screen of the internal alarm device 102. For example, the current setting state (e.g., the enabled state) is displayed in the valid setting items on the alarm sound setting screen. When switching between enabling and disabling the alarm sound output by the internal alarm device 102, the valid setting item is selected and determined using a cursor or the like, and the valid setting screen is displayed. On the valid setting screen, a slider or the like for selecting whether the setting is valid or invalid is displayed. By selecting the OK button while the slider is operated to the desired item side, the setting is determined, and the determined setting is sent to the internal alarm control unit 113. Also, when the cancel button is selected, the selection on the valid setting screen is discarded, and the previous setting (here, the enabled state) is maintained. Here, the monitor 104 that displays and operates the alarm sound setting screen having the valid setting item is provided in the driver's cab 4 and constitutes an internal alarm stop device that stops the operation of alerting the operator by the alarm (alarm sound) transmitted from the internal alarm device 102 by the operation of the operator.

[0030] As shown in FIG. 4, the current setting state (e.g., volume value "15") is displayed in the volume setting item 202 on the alarm sound setting screen 200. When adjusting the volume of the alarm sound output by the external alarm device 103, the volume setting item 202 is selected and determined using a cursor 203 or the like, and the volume setting screen 220 is displayed. On the volume setting screen 220, a slider 221 for adjusting the volume of the alarm sound is displayed. By selecting the OK button 223 while the position of the slider is adjusted to the desired volume, the setting is determined, and the determined setting is sent to the external alarm control unit 114. Also, when the cancel button 222 is selected, the selection on the volume setting screen 220 is discarded, and the previous setting (here, the volume value "15") is maintained. Here, the monitor 104 that displays and operates the alarm sound setting screen 200 having the volume setting item 202 is provided in the driver's cab 4 and constitutes an external volume adjustment device that adjusts the volume of the alarm (alarm sound) transmitted by the external alarm device 103 to alert the operator by the operation of the operator.

[0031] The same applies to the alarm sound setting screen of the internal alarm device 102. For example, the current setting state (e.g., the current volume value) is displayed in the volume setting item of the alarm sound setting screen. When adjusting the volume of the alarm sound output by the internal alarm device 102, the volume setting item is selected and determined by a cursor or the like to display the volume setting screen. On the volume setting screen, a slider or the like for adjusting the volume of the alarm sound is displayed. The setting is determined by selecting the OK button after adjusting the position of the slider so as to obtain the desired volume, and the determined setting is sent to the internal alarm control unit 113. Also, when the cancel button is selected, the selection on the volume setting screen is canceled and the previous setting (here, the current volume value) is maintained. Here, the monitor 104 that displays and operates the alarm sound setting screen having the volume setting item is provided in the driver's cab 4 and constitutes an internal volume adjustment device for adjusting the volume of an alarm (alarm sound) that is reported by the internal alarm device 102 for alerting the operator by the operation of the operator.

[0032] FIG. 5 is a flowchart showing the content of the alarm process by the controller.

[0033] In FIG. 5, the controller 110 determines whether there is a detection target in the detection range around the hydraulic excavator 100 (step S100). If the determination result is NO, the process of step S100 is repeated until the determination result becomes YES, that is, until a detection target is detected in the detection range.

[0034] Also, if the determination result in step S100 is NO, that is, if a detection target is detected in the detection range, then it is subsequently determined whether it is in a workable state (step S120).

[0035] If the determination result in step S120 is YES, that is, if it is in a workable state, an alarm is output from the external alarm device 103 (step S130), and the process ends.

[0036] Also, when the determination result in step S120 is NO, that is, when it is in a work-infeasible state, the mode of the alarm output from the external alarm device 103 is changed (step S131), and the process ends. Here, as an example of the change in the alarm mode which is the process of step S131, the case where the alarm output is stopped is shown.

[0037] The effects in the present embodiment configured as above will be described.

[0038] In the prior art, there is a device that notifies the state of a shovel to surrounding workers by an indicator lamp attached to the outer periphery of a construction machine so that it can be visually recognized by surrounding people. On the other hand, since the attention call by the indicator lamp is limited in effect when the operator does not have the construction machine in sight, for example, it is conceivable to separately notify by a loud alarm sound or the like. However, when notifying by an alarm sound or the like, if the warning sound for surrounding workers continues to sound for a long time, it may bother the neighboring residents or may be annoying to workers who have nothing to do with the operation of the construction machine.

[0039] In contrast, in the present embodiment, a work state switching device 101 that selectively switches the work state of a construction machine (for example, hydraulic shovel 100) between a workable state where it can operate and a non-workable state where it cannot operate is configured such that when it is switched to the workable state and an operator is detected by a surrounding detection device (for example, cameras 5a, 5b, 5c), the external alarm device 103 issues an alarm to alert the workers around the hydraulic shovel 100, and when the work state switching device 101 is switched to the non-workable state and an operator is detected by the surrounding detection device, the mode of the alarm issued by the external alarm device 103 for alerting is changed. Therefore, it is possible to alert the surrounding workers while suppressing unnecessary alarms in the non-workable state.

[0040] In addition, in this embodiment, in the control of the process as shown in FIG. 5 by the external alarm control unit 114, when a detection target is detected, if it is in an operable state, an alarm (for example, an alarm sound) is output from the external alarm device 103 (see steps S120 and S130 in FIG. 5), and if it is in an inoperable state, the output mode of the alarm from the external alarm device 103 is changed (for example, the alarm sound output as an alarm is stopped: see steps S120 and S131 in FIG. 5). Although this case has been exemplified and described, other variations can also be considered.

[0041] For example, in the control of the external alarm process, when a detection target is detected, if it is in an operable state, the alarm sound output as an alarm from the external alarm device 103 is output at a specified volume, and if it is in an inoperable state, the alarm sound output as an alarm from the external alarm device 103 is output at a volume reduced from the specified volume.

[0042] Alternatively, in the control of the external alarm process, when a detection target is detected, if it is in an operable state, the alarm sound output as an alarm from the external alarm device 103 is output at a specified interval, and if it is in an inoperable state, the interval of the alarm sound output as an alarm from the external alarm device 103 is made longer than the specified interval.

[0043] Or, in the control of the external alarm process, when a detection target is detected, if it is in an operable state, alarms (for example, alarm sounds) are output from all of the plurality of external alarm devices 103 (the first and second external alarm devices), and if it is in an inoperable state, the output of the alarms (alarm sounds) of a part of the plurality of external alarm devices 103 (the second external alarm device: for example, the external alarm device 103 on the driver's cab 4 side, or the external alarm device 103 closest to the driver's cab 4) is stopped, and alarms (alarm sounds) are output from the other external alarm devices 103 (the first external alarm device).

[0044] <Second Embodiment> The second embodiment of the present invention will be described with reference to FIG. 6.

[0045] This embodiment shows, in addition to the control of the external warning device (external warning process) by the external warning control unit in the warning process shown in the first embodiment, the control of the internal warning device (internal warning process) by the internal warning control unit. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0046] In this embodiment, the internal warning control unit 113 alerts (warns) the operator by outputting a warning from the internal warning device 102 installed in the cab 4 based on the determination results of the working state determination unit 111 and the detection state determination unit 112. Examples of the warning output from the internal warning device 102 include a warning sound or voice from a speaker, a buzzer sound from a buzzer, or a combination thereof.

[0047] FIG. 6 is a flowchart showing the content of the warning process in this embodiment.

[0048] In FIG. 6, the controller 110 determines whether there is a detection target in the detection range around the hydraulic excavator 100 (step S100). If the determination result is NO, the process of step S100 is repeated until the determination result becomes YES, that is, until a detection target is detected in the detection range.

[0049] Also, if the determination result in step S100 is NO, that is, if a detection target is detected in the detection range, then subsequently, it is determined whether the working state is possible (step S120).

[0050] If the determination result in step S120 is YES, that is, if the working state is possible, a warning is output from the internal warning device 102 (step S125), and subsequently, a warning is output from the external warning device 103 (step S130), and the process ends.

[0051] Also, when the determination result in step S120 is NO, that is, when it is in a work-infeasible state, an alarm is output from the internal alarm device 102 (step S126). Subsequently, the mode of the alarm output from the external alarm device 103 is changed (step S131), and the process ends. Here, as an example of the change in the mode of the alarm, which is the process of step S131, the case where the alarm output is stopped is shown.

[0052] Other configurations are the same as those in the first embodiment.

[0053] In the present embodiment configured as described above, the same effects as those in the first embodiment can be obtained.

[0054] <Third Embodiment> The third embodiment of the present invention will be described with reference to FIG. 7.

[0055] This embodiment shows a case where, in the alarm processing shown in the second embodiment, the mode of the alarm for the control of the internal alarm device (internal alarm processing) by the internal alarm control unit is made different from the workable state. In this embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and the description will be omitted as appropriate.

[0056] FIG. 7 is a flowchart showing the content of the alarm processing in this embodiment.

[0057] In FIG. 7, the controller 110 determines whether there is a detection target in the detection range around the hydraulic excavator 100 (step S100). When the determination result is NO, the process of step S100 is repeated until the determination result becomes YES, that is, until a detection target is detected in the detection range.

[0058] Also, when the determination result in step S100 is NO, that is, when a detection target is detected in the detection range, subsequently, it is determined whether it is in a workable state (step S120).

[0059] If the determination result in step S120 is YES, that is, if it is in an operable state, an alarm (for example, an alarm sound of a specified volume) is output from the internal alarm device 102 (step S125), and then, an alarm is output from the external alarm device 103 (step S130), and the process ends.

[0060] Also, if the determination result in step S120 is NO, that is, if it is in a non-operable state, the internal alarm device 102 outputs an alarm in a manner different from that in the case of an operable state (step S126A). Here, as an example of the output of an alarm in a manner different from that in the case of an operable state in the process of step S126A, the case where the output of the alarm is stopped is shown.

[0061] Subsequently, the mode of the alarm output from the external alarm device 103 is changed (step S131), and the process ends. Here, as an example of the change in the mode of the alarm which is the process of step S131, the case where the output of the alarm is stopped is shown.

[0062] Other configurations are the same as those in the first embodiment.

[0063] In the present embodiment configured as described above, the same effects as those in the first embodiment can be obtained.

[0064] In the present embodiment, in the control of the internal alarm process as shown in FIG. 7 by the internal alarm control unit 113, when a detection target is detected, if it is in an operable state, an alarm (for example, an alarm sound) is output from the internal alarm device 102 (see steps S120 and S125 in FIG. 7), and if it is in a non-operable state, the output mode of the alarm from the internal alarm device 102 is changed (for example, the alarm sound output as an alarm is stopped: see steps S120 and S126A in FIG. 7). Although this has been illustrated and described as an example, other variations can also be considered.

[0065] For example, in the control of internal alarm processing, when a detection target is detected, if the working state is available, an alarm sound output as an alarm from the internal alarm device 102 is output at a specified volume, and if the working state is unavailable, the alarm sound output as an alarm from the internal alarm device 102 is output at a volume reduced from the specified volume. It may be configured like this.

[0066] Alternatively, in the control of internal alarm processing, when a detection target is detected, if the working state is available, a buzzer sound output as an alarm from the internal alarm device 102 is output as a specified type of buzzer sound, and if the working state is unavailable, the buzzer sound output as an alarm from the internal alarm device 102 is output as a buzzer sound different from the specified type. It may be configured like this.

[0067] Or, in the control of internal alarm processing, when a detection target is detected, if the working state is available, a voice and a buzzer sound are output as an alarm from the internal alarm device 102, and if the working state is unavailable, only the buzzer sound (the voice is stopped) is output as an alarm from the internal alarm device 102. It may be configured like this.

[0068] <Other Embodiments> Various modifications are conceivable for the control of the internal alarm processing by the internal alarm control unit in the above embodiment.

[0069] For example, in the control of internal alarm processing, when a detection target is detected, if the working state is available, the volume of the alarm sound output as an alarm from the internal alarm device 102 is increased according to the approach of the detection target, and if the working state is unavailable, the volume of the alarm sound output as an alarm from the internal alarm device 102 is made constant regardless of the distance of the detection target. It may be configured like this.

[0070] Alternatively, in the control of internal alarm processing, when a detection target is detected, if the working state is available, the type of the buzzer sound output as an alarm from the internal alarm device 102 is changed from a specified type according to the approach of the detection target, and if the working state is unavailable, a buzzer sound of the specified type is output as an alarm from the internal alarm device 102. It may be configured like this.

[0071] Alternatively, in the control of the internal alarm process, when the detection target is detected, if it is in an operable state, a buzzer sound of a specified type that is output as an alarm from the internal alarm device 102 is output, and if it is in an inoperable state, a buzzer sound of a specified type is output as an alarm from the internal alarm device 102, and the type of the buzzer sound may be configured to be changed from the specified buzzer sound after a certain period of time has elapsed.

[0072] Alternatively, in the control of the internal alarm process, when the detection target is detected and it is in an inoperable state, a specified alarm is output from the internal alarm device 102, and when the working state changes from the inoperable state to the operable state, the mode of the alarm output from the internal alarm device 102 may be configured to raise an alert in a third mode different from the specified mode and other modes.

[0073] <Others> Note that the present invention is not limited to the above-described embodiments, and various modifications within the scope not departing from the gist thereof are included. For example, the present invention is not limited to having all the configurations described in the above embodiments, and those in which a part of the configuration is deleted are also included. Also, a part of the configuration according to one embodiment can be added to or replaced with the configuration according to another embodiment. Further, each configuration related to the above control device, the functions and execution processes of each such configuration, etc. may be realized in part or in whole by hardware (for example, designing the logic for executing each function with an integrated circuit, etc.). Also, the configuration related to the above control device may be a program (software) in which each function related to the configuration of the control device is realized by being read and executed by an arithmetic processing unit (for example, a CPU). Information related to the program can be stored, for example, in a semiconductor memory (flash memory, SSD, etc.), a magnetic storage device (hard disk drive, etc.), and a recording medium (magnetic disk, optical disk, etc.).

Explanation of Reference Numerals

[0074] 1... Upper revolving body, 2... Front working machine, 2a... Boom, 2b... Arm, 2c... Bucket, 2d... Boom cylinder, 2e... Arm cylinder, 2f... Bucket cylinder, 3... Lower traveling body, 3a... Travel hydraulic motor, 3b... Travel hydraulic motor, 4... Cab, 5a, 5b, 5c... Surrounding detection device, 100... Hydraulic excavator, 101... Working state switching device, 102... Internal alarm device, 103... External alarm device, 104... Monitor, 110... Controller (control device), 111... Working state determination unit, 112... Detection state determination unit, 113... Internal alarm control unit, 114... External alarm control unit, 200... Alarm sound setting screen, 201... Valid setting item, 202... Volume setting item, 203... Cursor, 210... Valid setting screen, 211, 221... Slider, 212, 222... Cancel button, 213, 223... Decision button, 220... Volume setting screen

Claims

1. The vehicle body and The vehicle body is provided with an ambient detection device that detects people around the vehicle body, An external alarm device is provided on the vehicle body and emits an alarm around the vehicle body, A construction machine equipped with a control device that, when a person is detected by the surrounding detection device, alerts the user by issuing an alarm from the external alarm device, The construction machine is equipped with a work state switching device that selectively switches the working state between an operational state and an operational state, The control device is When the work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the external alarm device will execute the alarm. A construction machine characterized in that, when the work state switching device is switched to a non-work state, and the surrounding detection device detects a person, the mode of the alarm issued by the external alarm device is changed.

2. In the construction machine described in claim 1, The control device is When the work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the external alarm device will execute the alarm. A construction machine characterized in that, when the work state switching device is switched to a non-work state, the alarm from the external alarm device is stopped even if the surrounding detection device detects a person.

3. In the construction machine described in claim 1, The external alarm device outputs an alarm sound as the alarm to the area around the vehicle body. The control device is When the aforementioned work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the external alarm device will output an alarm sound of a specified volume. A construction machine characterized in that, when the work state switching device is switched to a non-work state and the surrounding detection device detects a person, the external alarm device outputs an alarm sound at a volume reduced from the specified volume.

4. In the construction machine described in claim 1, The vehicle body includes a driver's cab where the operator sits, A construction machine characterized by comprising an external alarm stop device provided in the operator's cab, which stops the alarm from the external alarm device by operation by the operator.

5. In the construction machine according to claim 2 or 3, The vehicle body includes a driver's cab where the operator sits, A construction machine characterized by comprising an external volume control device provided in the driver's cab, which adjusts the volume of the alarm from the external alarm device by operation by the operator.

6. In the construction machine described in claim 1, The vehicle body is provided with a driver's cab where an operator sits, The external alarm device includes a first external alarm device and a second external alarm device located closer to the driver's cab than the first external alarm device. The control device is When the work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the first and second external alarm devices will execute the alarms. A construction machine characterized in that, when the work state switching device is switched to a non-work state, and the surrounding detection device detects a person, the first external alarm device executes the alarm while the second external alarm device stops the alarm.

7. In the construction machine described in claim 1, The vehicle body includes a driver's cab where the operator sits, The driver's cab is provided with an internal alarm device that emits an internal alarm within the driver's cab, When the work state switching device is switched to the work-ready state and the surrounding detection device detects a person, the control device executes the internal alarm by the internal alarm device. If the aforementioned work state switching device is switched to the non-work state, and the surrounding detection device detects a person, the mode of the internal alarm by the internal alarm device is changed. A construction machine characterized by the following features.

8. In the construction machine described in claim 7, The internal alarm device outputs an alarm sound into the driver's cabin as the internal alarm. The control device is When the aforementioned work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the internal alarm device will output an alarm sound of a specified volume. A construction machine characterized in that, when the work state switching device is switched to a non-work state and the surrounding detection device detects a person, the internal alarm device outputs an alarm sound at a volume reduced from the specified volume.

9. In the construction machine according to claim 7, the internal alarm device outputs an alarm sound into the operator's cab as the internal alarm, The control device is When the aforementioned work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the internal alarm device will output an alarm sound of a specified volume regardless of the elapsed time. A construction machine characterized in that, when the work state switching device is switched to a non-work state and the surrounding detection device detects a person, the internal alarm device outputs an alarm sound of the specified volume, and after a predetermined time has elapsed since the internal alarm device started outputting the alarm sound of the specified volume, the internal alarm device outputs an alarm sound of a volume lower than the specified volume.

10. In the construction machine described in claim 7, The internal alarm device outputs an alarm sound into the driver's cabin as the internal alarm. The control device is When the aforementioned work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the internal alarm device outputs an alarm sound of a predetermined volume, and the volume of the alarm sound increases as the detected person approaches the vehicle body. A construction machine characterized in that, when the work state switching device is switched to a non-work state, and the surrounding detection device detects a person, the internal alarm device outputs a warning sound of the specified volume regardless of the position of the detected person.

11. In the construction machine described in claim 7, The control device is When the work state switching device is switched to the work-ready state, and the surrounding detection device detects a person, the internal alarm device is instructed to execute the internal alarm in a prescribed manner. If the aforementioned work state switching device is switched to the non-work state, and the surrounding detection device detects a person, the internal alarm device shall execute the internal alarm in a manner different from the prescribed manner. A construction machine characterized in that, when the work state switching device is in a non-work state and the internal alarm is being executed by the internal alarm device in the other manner, and the work state switching device is switched to a work-ready state, the internal alarm device is instructed to execute the internal alarm in a third manner different from the prescribed manner and the other manner.

12. In the construction machine described in claim 7, The internal alarm device outputs an alarm sound into the driver's cabin as the internal alarm. A construction machine characterized by being provided in the driver's cab and comprising an internal alarm stop device that stops the alarm sound output by the internal alarm device when operated by the operator.

13. In the construction machine according to claim 7, The internal alarm device outputs an alarm sound into the driver's cabin as the internal alarm. A construction machine characterized by comprising an internal volume control device provided in the operator's cab, which adjusts the volume of the alarm sound output by the internal alarm device in response to operation by the operator.

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