Construction machine

Abstract

To provide a construction machine that can ensure drainage of a gas flow path of a fuel cell without providing complex attitude adjustment means even when operated on sloped ground.SOLUTION: A shovel comprising a traveling body 1, a rotating body 2 rotatably disposed above the traveling body 1 and a fuel cell 10 disposed on the rotating body 2 as a driving source further comprises; an inclination sensor 16 detecting inclination of the rotating body 2; and a vehicle controller 29 calculating information on a rotation range in which water present in a gas flow path 36 of the fuel cell 10 can be discharged in accordance with rotation of the rotating body 2 based on detection results of the inclination sensor 16, and providing notification of the rotation range information on a monitor 15.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a construction machine equipped with a fuel cell. [Background technology]

[0002] Fuel cells generate electricity by chemically reacting hydrogen and oxygen, and are provided with a gas flow path that discharges exhaust gas. The gas flow path of a fuel cell may contain, for example, water produced by the chemical reaction, and may freeze if exposed to a low-temperature environment such as below freezing. This may result in the gas flow path of the fuel cell becoming clogged, leading to a decrease in the performance of the fuel cell.

[0003] Patent Document 1 proposes providing a posture adjustment system for tilting the fuel cell in order to drain water from the fuel cell in a vehicle equipped with a fuel cell. The posture adjustment system includes an inclination detection means for detecting the inclination of the vehicle or the fuel cell, a posture adjustment means for adjusting the posture of the fuel cell, and a control unit for controlling the posture adjustment means so that the fuel cell is in a predetermined posture enabling drainage based on the detection result of the inclination detection means. The posture adjustment means is configured, for example, by using a plurality of air suspensions that support the vehicle body frame to which the fuel cell is fixed, and by driving the plurality of air suspensions with a plurality of actuators, respectively. According to the posture adjustment system of Patent Document 1, it is possible to ensure the drainage of the fuel cell regardless of the inclination of the road surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-055972 A Summary of the Invention [Problem to be solved by the invention]

[0005] A construction machine such as an excavator includes a running body and a rotating body that is provided on the upper side of the running body so as to be able to rotate, and it is considered that a fuel cell is mounted on the rotating body as a driving source. It is desired to ensure the drainage of the gas flow path of the fuel cell not only when the construction machine operates on flat ground but also when it operates on a slope. However, in the work using the construction machine, the running body is stopped on a slope and the rotating body is rotated relative to the running body frequently. In this case, the orientation of the rotating body relative to the slope of the ground changes continuously in multiple directions. When the attitude adjustment system of Patent Document 1 is adopted for a construction machine, not only the orientation of the running body but also the orientation of the rotating body must be considered, which causes a problem that the attitude adjustment means becomes complicated.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a construction machine that can ensure drainage of the gas flow path of a fuel cell without providing complex attitude adjustment means, even when operating on sloping ground. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a construction machine comprising a running body, a rotating body rotatably arranged above the running body, and a fuel cell arranged on the rotating body as a driving source, the machine comprising: an inclination sensor that detects the inclination of the rotating body; and a controller that calculates information on a rotation range in which water present in the gas flow path of the fuel cell can be discharged in response to the rotation of the rotating body based on the detection result of the inclination sensor, and reports the information on the rotation range by an alarm. Effect of the Invention

[0008] According to the present invention, even when the fuel cell is operated on a slope, the drainage of the gas flow passage of the fuel cell can be ensured without providing a complicated attitude adjustment means. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a schematic structure of a shovel in one embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing the configuration of a driving device of a shovel in one embodiment of the present invention. [Diagram 3] FIG. 1 is a diagram showing operation of a shovel on a slope in one embodiment of the present invention. [Figure 4] 2 is a block diagram showing devices related to notification control of a vehicle body controller according to an embodiment of the present invention; FIG. [Diagram 5] 5 is a flowchart showing the contents of notification control by a vehicle body controller in one embodiment of the present invention. [Figure 6] FIG. 2 is a diagram illustrating a monitor screen according to an embodiment of the present invention. [Figure 7] FIG. 13 is a diagram showing a monitor screen in a modified example of the present invention. [Figure 8] FIG. 13 is a block diagram showing devices related to notification control of a vehicle body controller in one modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a diagram showing a schematic structure of a shovel in this embodiment.

[0012] The excavator of this embodiment includes a traveling body 1, a rotating body 2 provided rotatably above the traveling body 1, and a working device 3 connected to the rotating body 2.

[0013] The running body 1 includes a track frame (not shown) that is H-shaped when viewed from above, left and right crawlers (not shown) that are rotatably arranged on the left and right sides of the track frame (the front and back sides of the paper surface of FIG. 1), respectively, and left and right traveling motors (not shown) that rotate the left and right crawlers, respectively. The running body 1 runs by the rotation of the left and right traveling motors.

[0014] The working device 3 includes a boom 4 rotatably connected to the rotating body 2, an arm 5 rotatably connected to the tip of the boom 4, and a bucket 6 rotatably connected to the tip of the arm 5. The boom 4 rotates by extension and retraction of a boom cylinder 7 (see FIG. 2 described below), the arm 5 rotates by extension and retraction of an arm cylinder (not shown), and the bucket 6 rotates by extension and retraction of a bucket cylinder (not shown).

[0015] The rotating body 2 rotates by the rotation of a rotation motor 8 (see FIG. 2 described later). The rotating body 2 includes a driver's cab 9 in which a driver sits, and a machine room 12 that houses devices such as a fuel cell 10 as a drive source and an electric motor 11 (see FIG. 2 described later).

[0016] The operator's cab 9 of the rotating body 2 is provided with a traveling operation device (not shown) that instructs the traveling of the traveling body 1, an operation operation device 13A (see Figure 2 described later) that instructs the rotation of the boom 4 and the rotation of the bucket 6, an operation operation device 13B (see Figure 2 described later) that instructs the rotation of the rotating body 2 and the rotation of the arm 5, a rotation speed dial 14 (see Figure 2 described later) that sets the rotation speed of the electric motor 11, and a monitor 15 (see Figures 4 and 6 described later).

[0017] The revolving structure 2 is provided with an inclination sensor 16. The inclination sensor 16 detects the inclination of the revolving structure 2 (specifically, the inclination angle in the front-rear direction and the left-right direction of the revolving structure 2 with respect to the horizontal plane).

[0018] The excavator includes a drive device that drives a plurality of hydraulic actuators (more specifically, the above-mentioned left and right traveling motors, boom cylinder 7, arm cylinder, bucket cylinder, and swing motor 8). Fig. 2 is a diagram showing a configuration related to driving the boom cylinder 7 and swing motor 8 as representative configurations of the drive device of the excavator in this embodiment.

[0019] The drive device of this embodiment includes the above-mentioned electric motor 11, a power control unit 17 that controls the rotation speed of the electric motor 11, a rotation speed sensor 18 that detects the rotation speed of the electric motor 11, a variable displacement main pump 19 (hydraulic pump) driven by the electric motor 11, a regulator 20 that adjusts the capacity of the main pump 19 (more specifically, the tilt angle of the swash plate), a main relief valve 21 that limits the discharge pressure of the main pump 19, a discharge pressure sensor 22 that detects the discharge pressure of the main pump 19, a boom control valve 23 that controls the flow direction and flow rate of pressurized oil from the main pump 19 to the boom cylinder 7, and a swing control valve 24 that controls the flow direction and flow rate of pressurized oil from the main pump 19 to the swing motor 8.

[0020] In addition, the drive device of this embodiment includes a pilot pump 25 driven by the electric motor 11, a pilot relief valve 26 that limits the discharge pressure of the pilot pump 25, boom solenoid valves 27A, 27B that generate pilot pressure using the discharge pressure of the pilot pump 25 as a source pressure and output the generated pilot pressure to the pressure receiving portion of the boom control valve 23, swing solenoid valves 28A, 28B that generate pilot pressure using the discharge pressure of the pilot pump 25 as a source pressure and output the generated pilot pressure to the pressure receiving portion of the swing control valve 24, and a vehicle body controller 29.

[0021] The vehicle body controller 29 has a processor that executes processes according to a program, a memory that stores the programs and data, and an interface that can communicate with other controllers, which will be described later.

[0022] The work operation device 13A includes an operation lever (operation member) that can be operated by the driver, a first potentiometer that generates and outputs a first operation signal in accordance with the amount of operation of the front side of the operation lever, and a second potentiometer that generates and outputs a second operation signal in accordance with the amount of operation of the rear side of the operation lever.

[0023] The work operation device 13B includes an operation lever (operating member) that can be operated by the driver, a third potentiometer that generates and outputs a third operation signal in accordance with the amount of operation of the front side of the operation lever, and a fourth potentiometer that generates and outputs a fourth operation signal in accordance with the amount of operation of the rear side of the operation lever.

[0024] The vehicle body controller 29 generates a drive signal in response to a first operation signal from the work operation device 13A and outputs it to the boom solenoid valve 27A. The boom solenoid valve 27A generates a pilot pressure corresponding to the drive signal and outputs it to a pressure receiving portion on one side of the boom control valve 23. This switches the boom control valve 23 to the switching position on the right side in the figure, and pressure oil from the main pump 19 is supplied to the upper rod chamber in the figure of the boom cylinder 7 via the boom control valve 23, causing the boom cylinder 7 to retract and contract. As a result, the boom 4 is lowered.

[0025] The vehicle body controller 29 generates a drive signal in response to a second operation signal from the work operation device 13A, and outputs it to the boom solenoid valve 27B. The boom solenoid valve 27B generates a pilot pressure corresponding to the drive signal, and outputs it to the pressure receiving portion on the other side of the boom control valve 23. This causes the boom control valve 23 to be switched to the switching position on the left side in the figure, and pressure oil from the main pump 19 is supplied to the bottom chamber on the lower side in the figure of the boom cylinder 7 via the boom control valve 23, and the boom cylinder 7 extends. As a result, the boom 4 rises.

[0026] The vehicle body controller 29 generates a drive signal in response to a third operation signal from the work operation device 13B and outputs it to the swing solenoid valve 28A. The swing solenoid valve 28A generates a pilot pressure corresponding to the drive signal and outputs it to a pressure receiving portion on one side of the swing control valve 24. As a result, the swing control valve 24 is switched to the switching position on the right side in the figure, and pressure oil from the main pump 19 is supplied to the upper port in the figure of the swing motor 8 via the swing control valve 24, and the swing motor 8 rotates in one direction. As a result, the swing body 2 swings to the right.

[0027] The vehicle body controller 29 generates a drive signal in response to a fourth operation signal from the work operation device 13B and outputs it to the swing solenoid valve 28B. The swing solenoid valve 28B generates a pilot pressure corresponding to the drive signal and outputs it to the pressure receiving portion on the other side of the swing control valve 24. As a result, the swing control valve 24 is switched to the switching position on the left side in the figure, and pressure oil from the main pump 19 is supplied to the port on the lower side in the figure of the swing motor 8 via the swing control valve 24, and the swing motor 8 rotates in the opposite direction. As a result, the swing body 2 swings to the left.

[0028] Although not shown, the configurations relating to the drive of the left and right travel motors, arm cylinders, and bucket cylinders are also substantially the same.

[0029] The vehicle body controller 29 controls the regulator 20 to adjust the capacity of the main pump 19 based on the maximum value of the operation signals from the traveling operation device and the work operation device 13A, 13B, the discharge pressure of the main pump 19 detected by the discharge pressure sensor 22, and the rotation speed of the electric motor 11 detected by the rotation speed sensor 18.

[0030] The power control unit 17 includes a DC / AC converter that converts DC power into AC power, an inverter that varies the frequency of the AC power converted by the DC / AC converter, and an inverter controller that controls the inverter. The inverter controller includes a processor that executes processing according to a program, a memory that stores the program and data, and an interface that can communicate with the vehicle body controller 29.

[0031] The vehicle body controller 29 transmits the rotation speed of the electric motor 11 set by the rotation speed dial 14 to the inverter controller as a target rotation speed. Also, when the duration of the non-operation state of the traveling operation device and the work operation device 13A, 13B (in other words, all of the operation levers) reaches a predetermined value T, the vehicle body controller 29 transmits a predetermined idle rotation speed to the inverter controller as the target rotation speed. The inverter controller controls the inverter so that the rotation speed of the electric motor 11 detected by the rotation speed sensor 18 becomes the above-mentioned target rotation speed.

[0032] The drive device of this embodiment further comprises the above-mentioned fuel cell 10, a boost converter 30 that boosts the power generated by the fuel cell 10 and supplies it to the power control unit 17, a fuel cell controller 31 that controls the fuel cell 10 and the boost converter 30, a battery 33 (electricity storage device) connected to the boost converter 30 and the power control unit 17 via a DC / DC converter 32, and a battery controller 34 that controls the DC / DC converter 32. The battery 33 charges with excess power from the fuel cell 10 and discharges to make up for a power shortage from the fuel cell 10.

[0033] The fuel cell controller 31 has a processor that executes processing according to a program, a memory that stores programs and data, and an interface that can communicate with the vehicle body controller 29. The fuel cell controller 31 monitors the fuel cell 10 based on state quantities of the fuel cell 10 detected by multiple fuel cell sensors (not shown), and transmits the results to the vehicle body controller 29.

[0034] The battery controller 34 has a processor that executes processing according to a program, a memory that stores programs and data, and an interface that can communicate with the vehicle body controller 29. The battery controller 34 monitors the battery 33 based on state quantities of the battery 33 detected by a plurality of battery sensors (not shown), and transmits the results to the vehicle body controller 29.

[0035] The vehicle body controller 29 sets a target power, and transmits the target power to the fuel cell controller 31. The fuel cell controller 31 controls the power generated by the fuel cell 10 so as to approach the target power, and also controls the boost converter 30.

[0036] When the power of the fuel cell 10 is in excess of the target power and the charge rate of the battery 33 is less than a predetermined value (e.g., 90%), the vehicle body controller 29 transmits a charge command to the battery controller 34. The battery controller 34 controls the DC / DC converter 32 in response to the charge command to charge the battery 33 using part of the power of the fuel cell 10 and control the charging power. This consumes the excess power of the fuel cell 10.

[0037] When the power of the fuel cell 10 is excessive with respect to the target power and the charge rate of the battery 33 is equal to or higher than a predetermined value, the vehicle body controller 29 controls the load adjusting device 35 to increase the load of the electric motor 11. The load adjusting device 35 is, for example, a variable throttle valve arranged in an oil passage between the boom control valve 23 and the tank, and by reducing the opening degree, it is possible to increase the discharge pressure of the main pump 19. This makes it possible to increase the load of the electric motor 11.

[0038] When the power of the fuel cell 10 is insufficient relative to the target power, the vehicle body controller 29 transmits a discharge command to the battery controller 34. The battery controller 34 controls the DC / DC converter 32 in response to the discharge command to discharge the battery 33 and control the discharge power, thereby making up for the power shortage of the fuel cell 10.

[0039] The fuel cell 10 generates electricity by chemically reacting hydrogen and oxygen, and is provided with a gas flow path 36 (formed, for example, of piping or the like) for discharging exhaust gas, as shown in Fig. 1 above. The gas flow path 36 of the fuel cell 10 extends, for example, in the front-to-rear direction of the rotating body 2, and is configured to incline downward toward the rear side of the rotating body 2. This allows, for example, water generated by a chemical reaction to be discharged by gravity even if it is present in the gas flow path 36.

[0040] In the course of work using a shovel, the running body 1 is stopped on a slope and the revolving body 2 is rotated relative to the running body 1 frequently (see Figs. 3(a) and 3(b)). For example, as shown in Fig. 3(a), if the inclination direction of the ground and the inclination direction of the gas flow path 36 of the fuel cell 10 are the same, water can be discharged without accumulating in the gas flow path 36 of the fuel cell 10. However, as shown in Fig. 3(b), in a situation where the inclination direction of the ground and the inclination direction of the gas flow path 36 of the fuel cell 10 are opposite, water generated by the reaction of the fuel cell 10 cannot flow through the gas flow path 36 and remains there. For this reason, it is necessary to take into consideration the direction of the revolving body 2, i.e., the revolving angle of the revolving body 2.

[0041] As shown in FIG. 4, the vehicle body controller 29 of this embodiment calculates information on the rotation range in which water present in the gas flow path 36 of the fuel cell 10 can be discharged in response to the rotation of the rotating body 2 based on the detection result of the inclination sensor 16, and controls the monitor 15 to notify the information on this rotation range.

[0042] Details of the notification control of the vehicle body controller 29 in this embodiment will be described with reference to Fig. 5. Fig. 5 is a flowchart showing the contents of the notification control of the vehicle body controller in this embodiment.

[0043] In step S1, the vehicle body controller 29 determines whether the fuel cell 10 is generating power based on information from the fuel cell controller 31. If the fuel cell 10 is generating power, the notification control ends. On the other hand, if the fuel cell 10 is not generating power, the process proceeds to step S2.

[0044] In step S2, the vehicle body controller 29 calculates, as the above-mentioned information on the rotation range, a first rotation range (hereinafter referred to as a drainable range) within the rotation range of the rotating body 2, which is a rotation range within which water present in the gas flow path 36 of the fuel cell 10 can be drained. The vehicle body controller 29 also calculates a second rotation range (hereinafter referred to as a non-drainable range) within the rotation range of the rotating body 2, which is a range within which water present in the gas flow path 36 of the fuel cell 10 cannot be drained. To explain in more detail, the vehicle body controller 29 calculates the tilt angle of the gas flow path 36 of the fuel cell 10 corresponding to the current rotation angle of the rotating body 2 based on the detection result of the tilt sensor 16, and calculates a change in the tilt angle of the gas flow path 36 of the fuel cell 10 accompanying a change in the rotation angle of the rotating body 2. Then, for each rotation angle of the rotating body 2, if the inclination angle of the gas flow path 36 of the corresponding fuel cell 10 is equal to or greater than a predetermined value, it is determined that the water present in the gas flow path 36 can be discharged by gravity, and if the inclination angle of the gas flow path 36 of the corresponding fuel cell 10 is less than the predetermined value, it is determined that the water present in the gas flow path 36 cannot be discharged by gravity. The vehicle body controller 29 causes the monitor 15 to display the drainable range and the non-drainable range calculated as described above.

[0045] As shown in FIG. 6, for example, the monitor 15 displays the drainable area A1 and the undrainable area B1 in a circular ring shape in a coordinate system that represents the rotation range of the rotating body 2 based on the rotating body 2 (more specifically, a coordinate system that has the rotation center of the rotating body 2 as the origin and is formed by the left-right direction X1 and the front-back direction Y1 of the rotating body 2).

[0046] Proceeding to step S3, the vehicle controller 29 judges whether the rotation angle (rotation direction) of the rotating body 2 is in the non-drainable area. If the rotation angle of the rotating body 2 is not in the non-drainable area, the notification control is terminated. On the other hand, if the rotation angle of the rotating body 2 is in the non-drainable area, the process proceeds to step S4.

[0047] In step S4, the vehicle body controller 29 determines whether or not it is necessary to drain the water present in the gas flow path 36 of the fuel cell 10. That is, for example, the time during which the rotation angle of the rotating body 2 continues to be in the drainage impossible area during power generation of the fuel cell 10 is calculated, and whether or not it is necessary to drain the water is determined based on whether or not this time is equal to or greater than a predetermined value. If it is determined that it is not necessary to drain the water present in the gas flow path 36 of the fuel cell 10, the notification control is terminated. On the other hand, if it is determined that it is necessary to drain the water present in the gas flow path 36 of the fuel cell 10, the process proceeds to step S5.

[0048] In step S5, the vehicle body controller 29 causes the monitor 15 to display a message or an icon prompting the driver to perform a rotation operation on the rotating body 2.

[0049] As described above, in this embodiment, information on the rotation range within which water present in the gas flow path 36 of the fuel cell 10 can be discharged in accordance with the rotation of the rotating body 2 is provided to the operator. This ensures the drainage of the gas flow path 36 of the fuel cell 10 without providing a complicated attitude adjustment means not only when the excavator is operated on flat ground but also when it is operated on a slope.

[0050] In the above embodiment, the monitor 15 displays the drainable area A1 and the non-drainable area B1 in a circular ring shape in a coordinate system (more specifically, a coordinate system having the rotation center of the rotating body 2 as the origin and consisting of the left-right direction X1 and the front-back direction Y1 of the rotating body 2) that represents the rotation range of the rotating body 2 based on the rotating body 2, but this is not limited to the above. Although the monitor 15 displays the drainable area, it is not necessary for it to display the non-drainable area.

[0051] 7, the monitor 15 may display the drainable range A2 and the non-drainable range B2 in a circular shape in a coordinate system (specifically, a coordinate system with the origin at the center of rotation of the rotating body 2 and the left-right direction X2 and the front-back direction Y2 of the running body 1) that represents the rotation range of the rotating body 2 with the running body 1 as a reference. Furthermore, for example, information on the rotation angle of the rotating body 2 may be displayed by a marker C indicating the front side of the rotating body 2 or an icon D indicating the direction of the rotating body 2. In this modification, the excavator includes a rotation angle sensor 37 that detects the rotation angle of the rotating body 2 relative to the running body 1. The vehicle controller 29 calculates the drainable range and the non-drainable range in the coordinate system with the running body 1 as a reference based on the detection results of the inclination sensor 16 and the rotation angle sensor 37, and displays them on the monitor 15. Also, information on the rotation angle of the rotating body 2 detected by the rotation angle sensor 37 is displayed on the monitor 15.

[0052] Although not shown, the monitor 15 simultaneously displays the information on the rotation angle of the revolving body 2 detected by the rotation angle sensor 37 and the range in which water can be drained, but does not necessarily need to display the range in which water cannot be drained.

[0053] In the above embodiment, the alarm that notifies the user of the rotation range in which the water present in the gas flow path 36 of the fuel cell 10 can be drained in response to the rotation of the rotating body 2 is the monitor 15, but this is not limiting. The alarm may be, for example, a buzzer that sounds when the rotation angle (rotation direction) of the rotating body 2 is in a region where water can be drained, and does not sound when the rotation angle (rotation direction) of the rotating body 2 is in a region where water cannot be drained. Even in such a modified example, the same effect as in the above embodiment can be obtained.

[0054] In the above embodiment, the vehicle body controller 29 calculates information on the rotation range in which water present in the gas flow path 36 of the fuel cell 10 can be discharged in response to the rotation of the rotating body 2 while the fuel cell 10 is generating electricity, and notifies the information on the rotation range with an alarm, but this is not limited to the above. For example, when the vehicle body controller 29 determines that it is necessary to discharge water present in the gas flow path 36 of the fuel cell 10 (i.e., when the fuel cell 10 is generating electricity and determines that the time during which the rotation angle of the rotating body 2 remains in the non-drainable region is equal to or longer than a predetermined value), the vehicle body controller 29 may calculate the information on the rotation range and notify the information with an alarm, not only while the fuel cell 10 is generating electricity, but also when the fuel cell 10 is not generating electricity.

[0055] Although a shovel has been described above as an example of the construction machine of the present invention, the present invention is not limited to this. In other words, the present invention may be applied to other construction machines that include a running body, a rotating body that is rotatably provided above the running body, and a fuel cell that is disposed on the rotating body as a drive source. [Explanation of symbols]

[0056] 1. Running body 2 Rotating body 10 fuel cell 15 Monitor 16 Tilt Sensor 29 Vehicle Controller 36 Gas flow path 37 Rotation angle sensor

Claims

1. A construction machine including a traveling body, a rotating body provided rotatably above the traveling body, and a fuel cell as a drive source disposed on the rotating body, An inclination sensor that detects the inclination of the rotating body; a controller that calculates information on a rotation range in which water present in the gas flow path of the fuel cell can be discharged in accordance with the rotation of the rotating body based on the detection results of the inclination sensor, and notifies the information on the rotation range by an alarm.

2. 2. The construction machine according to claim 1, The alarm is a monitor, the information on the rotation range is a first rotation range that is a rotation range of the rotating body within which water present in a gas flow path of the fuel cell can be discharged; A construction machine characterized in that the controller causes the monitor to display the first turning range.

3. The construction machine according to claim 2, A construction machine characterized in that the controller displays on the monitor a second rotation range, which is a rotation range of the rotating body within which water present in the gas flow path of the fuel cell cannot be discharged, together with the first rotation range.

4. The construction machine according to claim 2, a rotation angle sensor for detecting a rotation angle of the rotating body relative to the traveling body, A construction machine according to claim 1, wherein the controller simultaneously displays on the monitor information on the rotation angle of the rotating body detected by the rotation angle sensor and the first rotation range.

5. 2. The construction machine according to claim 1, The controller determines whether or not the water needs to be drained, and when it determines that the water needs to be drained, prompts the user to rotate the rotating body using the alarm.

6. 2. The construction machine according to claim 1, The controller determines whether or not the water needs to be drained, and when it determines that the water needs to be drained, reports information about the turning range using the alarm.

7. The construction machine according to claim 3, a rotation angle sensor for detecting a rotation angle of the rotating body relative to the traveling body, The controller calculates the first turning range and the second turning range in a coordinate system based on the running body based on the detection results of the inclination sensor and the turning angle sensor, and displays on the monitor the first turning range, the second turning range, and information on the turning angle of the running body detected by the turning angle sensor.

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