Electrically powered construction machine

Abstract

A hydraulic excavator (1) is provided with a work sound device (25) that outputs an announcement sound around a machine body (2-4) during operation of the machine body (2-4), and a machine body controller (24) controls the work sound device (25) so that the volume of the announcement sound output from the work sound device (25) is reduced in accordance with an increase in the rotational speed of a cooling fan (22, 23). The occurrence of noise generated by the work sound device is suppressed, and the operator around the machine body is notified that the machine body is in operation.

Description

Technical Field

[0001] This invention relates to electric engineering machinery such as electric hydraulic excavators. Background Technology

[0002] Among construction machinery, such as hydraulic excavators, there are types of construction machinery (electric construction machinery) that, instead of an engine (internal combustion engine) as a power source, are driven by an electric motor supplied with electricity from a battery cell or an external power source. Prior art disclosing such electric construction machinery includes, for example, Patent Document 1.

[0003] Patent Document 1 discloses a rotary work machine comprising: a rotary table; a work device disposed on the rotary table; a radiator fan for cooling a radiator; an oil cooler fan for cooling an oil cooler independently of the radiator fan; a battery unit; an electric motor driven by electricity output from the battery unit; and a hydraulic pump for discharging working oil by being driven by the electric motor. The electric motor and the hydraulic pump are disposed to the side of the battery unit, and the radiator fan and the oil cooler fan are disposed to the side of the battery unit and above the hydraulic pump and the electric motor. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2021-080709 Summary of the Invention The problem that the invention aims to solve

[0005] Compared to motor-driven construction machinery, electric construction machinery is characterized by its quieter operation. Therefore, for example, nearby workers might approach a ready-to-move-in machine without noticing, potentially leading to a collision when the machine begins to move. Therefore, to inform nearby workers that the machine is in operation, an Acoustic Vehicle Alerting System (AVAS) could be considered.

[0006] However, depending on the machine's operating conditions, there may be significant operating noise from equipment such as cooling fans. As a result, the output of the operating noise devices may exceed the necessary noise due to the superposition of these operating noises, causing discomfort to the machine operator and surrounding workers.

[0007] The present invention was made in view of the above-mentioned problems, and its object is to provide an electric engineering machine that can suppress the generation of noise from the working sound device and can notify the surrounding operators that the machine is in operation. Methods for solving problems

[0008] To achieve the above objectives, the present invention provides an electric construction machinery comprising: a lower traveling body; an upper rotating body rotatably mounted on the lower traveling body; a working device mounted on the upper rotating body and forming a machine body together with the lower traveling body and the upper rotating body; an electric motor serving as a power source for the machine body; a cooling fan for cooling a circulating medium circulating within the machine body; and a machine body controller for controlling the rotational speed of the cooling fan. In the electric construction machinery, a working sound device is provided that outputs a notification sound to the surrounding area of ​​the machine body during operation. The machine body controller controls the working sound device such that the volume of the notification sound output by the working sound device decreases as the rotational speed of the cooling fan increases. Invention Effects

[0009] The electric construction machinery according to the present invention can suppress the noise generated by the working sound device and notify the surrounding operators that the machine is in operation. Attached Figure Description

[0010] Figure 1 This is a side view of the electric hydraulic excavator according to the first embodiment of the present invention. Figure 2 This is a top view of the electric hydraulic excavator according to the first embodiment of the present invention. Figure 3 This is a top view showing the situation inside the driver's cab in the first embodiment of the present invention. Figure 4 This is a functional block diagram of the fuselage controller related to the control of the cooling fan and the operating noise device in the first embodiment of the present invention. Figure 5 This is a characteristic diagram showing the relationship between the working oil temperature or cooling water temperature and the speed of the cooling fan and the output of the working noise device in the first embodiment of the present invention. Figure 6 This is a flowchart illustrating the processing of the fuselage controller related to the control of the cooling fan and the operating noise device in the first embodiment of the present invention. Figure 7 This is a flowchart illustrating a modified example of the processing of the fuselage controller related to the control of the cooling fan and the operating noise device in the first embodiment of the present invention. Figure 8This is a characteristic diagram showing the relationship between the working oil temperature or cooling water temperature and the speed of the cooling fan and the output of the working noise device in the second embodiment of the present invention. Figure 9 This is a flowchart illustrating the processing of the fuselage controller related to the control of the cooling fan and the operating noise device in the second embodiment of the present invention. Detailed Implementation

[0011] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, this embodiment uses an electric hydraulic excavator as an example, but the present invention can also be applied to other electric construction machinery. Additionally, in each drawing, the same or equivalent components are labeled with the same reference numerals, and repeated descriptions are omitted where appropriate. Example 1

[0012] Figure 1 This is a side view of an electric hydraulic excavator (hereinafter referred to as a hydraulic excavator) according to the first embodiment of the present invention. The hydraulic excavator 1 includes: a tracked lower traveling body 2 capable of traveling in a forward and backward direction; an upper slewing body 3 rotatably mounted on the lower traveling body 2; and a working device 4 located at the front of the upper slewing body 3. The lower traveling body 2, the upper slewing body 3, and the working device 4 constitute the body of the hydraulic excavator 1. The hydraulic excavator 1 travels at the work site via the lower traveling body 2, and while rotating the upper slewing body 3, it also performs pitching motions on the working device 4, thereby performing sand excavation operations, etc.

[0013] The upper rotating body 3 is equipped with a power source 9 including an electric motor 10. The hydraulic excavator 1 is operated by supplying power to the power source 9 from an external power source (not shown) via a power cable 12. Alternatively, instead of supplying power from an external power source, a battery unit can be installed in the upper rotating body 3, and power can be supplied to the power source 9 from the battery unit.

[0014] The working device 4 includes: a swing column 4A mounted on the front end of the slewing frame 5, which can swing left and right; a boom 4B mounted on the swing column 4A, which can pitch; a stick 4C rotatably mounted on the end of the boom 4B; and a bucket 4D rotatably mounted on the end of the stick 4C. The boom 4B, stick 4C, and bucket 4D are driven by a boom cylinder 4E, a stick cylinder 4F, and a bucket cylinder 4G. Additionally, a swing cylinder (not shown) is provided between the slewing frame 5 and the swing column 4A to swing the swing column 4A left and right.

[0015] The upper slewing body 3 includes: a slewing frame 5 that is rotatably mounted on the lower traveling body 2 and serves as a base; a driver's cab 6 provided on the slewing frame 5; a cabin cover 7; a power source 9; and a counterweight 13.

[0016] The cab 6 is located on the front left side of the slewing frame 5. The cab 6 is formed as a longitudinally elongated box shape enclosed by the front section 6A, the rear section 6B, the left side section 6C, the right side section 6D, and the upper section 6E. A door 6F is installed on the left side section 6C of the cab 6, and the operator enters and exits the cab 6 by opening and closing the door 6F.

[0017] The cabin cover 7 is located in front of the counterweight 13 and is mounted on the slewing frame 5. The cabin cover 7 and the counterweight 13 form a mechanical chamber 8 on the slewing frame 5, which houses the power source 9, hydraulic pump 11, control valve (not shown), and other mounted equipment.

[0018] The power source 9 is located in front of the counterweight 13 and mounted on the slewing frame 5, and is housed within the mechanical chamber 8 enclosed by the cabin cover 7 and the counterweight 13. The power source 9 includes an electric motor 10 and a motor control device 36 (e.g., [missing information]) for controlling the operation of the electric motor 10. Figure 4 (As shown). The electric motor 10 is, for example, a three-phase induction motor, which rotates by being powered (powered) from an external power source (not shown) such as a commercial power supply that provides three-phase alternating current via a power supply cable 12, thereby driving the hydraulic pump 11. In this case, the operation control (power supply control) of the electric motor 10 is performed by the motor control device 36.

[0019] The hydraulic pump 11 is connected to the output shaft of the electric motor 10. Driven by the electric motor 10, the hydraulic pump 11 pumps oil stored in the working oil tank 20 (e.g., ...). Figure 2 The working oil (as shown) is pressurized and discharged toward the hydraulic motors for travel and rotation (not shown) mounted on the hydraulic excavator 1, as well as the boom cylinder 4E, stick cylinder 4F, bucket cylinder 4G, etc., located on the working device 4.

[0020] Power cable 12 electrically connects an external power source (not shown) to power source 9. One end of power cable 12 is connected to the external power source, and the other end is connected to the motor control device 36 of power source 9 (e.g., ...). Figure 4 (As shown). The middle section of the power supply cable 12 along its length is held by the cable retainer 15.

[0021] The counterweight 13 is located at the rear end of the rotating frame 5 and is used to achieve weight balance with the working device 4. The counterweight 13 is composed of a quadrilateral frame-shaped block and is integrally formed by casting metal materials such as cast iron and cast steel. The counterweight 13 stands upright from the rear end of the rotating frame 5 and covers the mounting equipment such as the electric motor 10 and the hydraulic pump 11 from the rear side.

[0022] A quadrilateral maintenance opening 13B is provided on the rear surface 13A of the counterweight 13. The maintenance opening 13B is located at the center of the counterweight 13 in both the vertical and horizontal directions, and extends from the rear surface 13A to the front surface (not shown) of the counterweight 13 in the longitudinal direction. The maintenance opening 13B communicates with the machinery room 8 enclosed by the compartment cover 7 and the counterweight 13. Thus, the configuration allows for maintenance work on the power source 9, including the electric motor 10, housed within the machinery room 8, from the rear surface 13A side of the counterweight 13 through the maintenance opening 13B.

[0023] An opening / closing cover 14 is provided on the rear surface 13A of the counterweight 13. The opening / closing cover 14 is formed as a quadrilateral plate and can be opened and closed to cover the maintenance opening 13B of the counterweight 13. The opening / closing cover 14 can be opened and closed in the vertical direction as shown in the image. Figure 1 As shown by the solid line, the maintenance opening 13B of the counterweight 13 is closed in the closed position, as shown by the solid line. Figure 1 The maintenance opening 13B of the counterweight 13 is moved between open positions as shown by the dashed line.

[0024] Therefore, when performing maintenance work on the power source 9, etc., housed in the machine room 8, such as Figure 1 As shown by the dashed line, moving the opening / closing cover 14 to the open position opens the maintenance opening 13B of the counterweight 13. This allows the operator to access the power source 9 from the rear surface 13A side of the counterweight 13 through the maintenance opening 13B.

[0025] Figure 2 This is a top view of hydraulic excavator 1. It should be noted that... Figure 2 The diagram of the working device 4 is omitted. On the right side of the cab 6 on the slewing frame 5 are an electric motor 10, a working oil tank 20 for storing working oil, a cooling water tank 21 for storing cooling water, a working oil cooling fan 22 for blowing air into the working oil tank 20 to cool the working oil, a cooling water cooling fan 23 for blowing air into the cooling water tank 21 to cool the cooling water, and a machine body controller 24 for controlling the movement of the machine body 2-4. On the left and right rear sides of the upper slewing body 3 are working sound devices 25a and 25b (hereinafter referred to as working sound devices 25) to notify surrounding operators that the machine body 2-4 is in operation. An oil temperature sensor 20a (e.g., oil temperature sensor) is installed in the working oil tank 20 to detect the temperature of the working oil (working oil temperature). Figure 4 As shown). A water temperature sensor 21a (as shown) is installed in the cooling water tank 21 to detect the temperature of the cooling water (cooling water temperature). Figure 4 (As shown).

[0026] Figure 3This is a top view showing the interior of the cab 6. A seat 30 for the operator is located at the rear center of the cab 6. Driving control levers 31a and 31b (hereinafter referred to as driving control levers 31) for operating the lower traveling body 2 are located in front of the seat 30, and working control levers 32a and 32b (hereinafter referred to as working control levers 32) are located on the left and right sides of the seat 30. A door lock lever 33 (locking device) is located diagonally in front of the left side of the seat 30 (near the door 6F). When the door lock lever 33 is operated, for example, to the lowered position (lock-out position), the entrance to the cab 6 is blocked by the door lock lever 33, and the operation of the driving control lever 31 and the working control lever 32 becomes effective (locked state). Conversely, when the door lock lever 33 is operated, for example, to the raised position (locked position), the entrance to the cab 6 is opened, and the operation of the driving control levers 31a and 31b and the working control levers 32a and 32b becomes ineffective (lock-out state). In this embodiment, the locked state is equivalent to the machine body 2-4 being in a non-operating state, and the unlocked state is equivalent to the machine body 2-4 being in operation. It should be noted that in this embodiment, the description assumes the machine body 2-4 is in operation when the lock is unlocked, but this is not a limitation. For example, it could also be described as the machine body 2-4 being in operation when the lock is unlocked and both the travel lever 31 and the work lever 32 are operated. A speed control knob 34 (target speed indicator) for indicating the rotational speed of the electric motor 10 is provided behind the work lever 32b on the right side. It should be noted that the target speed indicator can also be a monitor on a touch panel. Pressure sensors 35a, 35b, and 35c (e.g., for detecting their respective operations) are provided on the travel lever 31, the work lever 32, and the door lock lever 33. Figure 4 (As shown). It should be noted that, instead of setting pressure sensors 35a, 35b, and 35c, the driving control lever 31, the working control lever 32, and the door lock lever 33 can be electronically controlled, with the machine controller 24 directly detecting their respective operations.

[0027] Figure 4 This is a functional block diagram of the fuselage controller 24, which is related to the control of cooling fans 22 and 23 and the operating sound device 25. The fuselage controller 24 includes a signal input unit 24a, an arithmetic processing unit 24b, and a signal output unit 24c. The fuselage controller 24 includes an arithmetic unit such as a CPU, a storage unit such as ROM and RAM, and an input / output interface for signal input and output with external devices. By executing programs stored in ROM, etc., the functions of each part are realized.

[0028] The working oil cooling fan 22 includes a fan 22a and a fan controller 22b that controls the speed of the fan 22a. The fan controller 22b controls the speed of the fan 22a according to a control signal input from the signal output unit 24c. The cooling water cooling fan 23 includes a fan 23a and a fan controller 23b that controls the speed of the fan 23a. The fan controller 23b controls the speed of the fan 23a according to a control signal input from the signal output unit 24c. The speeds of the cooling fans 22 and 23 are controlled, for example, by PWM control. In this embodiment, the fuselage controller 24 is configured to estimate the speeds of the cooling fans 22 and 23 based on command values ​​sent to the fan controllers 22b and 23b. However, it is also possible to use a configuration where speed sensors are installed on the fans 22a and 23a, and the signals from these speed sensors are input to the fuselage controller 24.

[0029] The signal input unit 24a receives signals from pressure sensors 35a-35c, temperature sensors 20a and 21a, and the speed control knob 34. The processing unit 24b, based on the signals input to the signal input unit 24a, determines the rotational speed of the electric motor 10, the rotational speeds of the cooling fans 22 and 23, and the output (equivalent to volume) of the operating sound device 25. The signal output unit 24c, based on the processing results of the processing unit 24b, outputs control signals to the motor control device 36, the fan controllers 22b and 23b, and the operating sound device 25.

[0030] Figure 5This is a characteristic graph showing the relationship between the operating oil temperature or coolant temperature, the rotational speed of cooling fans 22 and 23, and the output of the operating noise device 25. As the operating oil temperature or coolant temperature rises, the rotational speed of cooling fans 22 and 23 increases. Conversely, as the operating oil temperature or coolant temperature rises, the output of the operating noise device 25 decreases. In other words, as the rotational speed of cooling fans 22 and 23 increases, the output of the operating noise device 25 decreases. In other words, the higher the rotational speed of cooling fans 22 and 23, the lower the volume of the operating noise device 25 needs to be set; conversely, the lower the rotational speed of cooling fans 22 and 23, the higher the volume of the operating noise device 25 needs to be set. The reason why the output of the operating noise device 25 decreases as the rotational speed of cooling fans 22 and 23 increases is that even if the volume of the operating noise device 25 is reduced, the noise from cooling fans 22 and 23 will still increase due to the increased rotational speed, making it known to those around that the machine bodies 2 to 4 are in operation. Furthermore, when the speed of cooling fans 22 and 23 increases and exceeds the threshold R1 (when the operating oil temperature or coolant temperature increases and exceeds the threshold T1), the output of the operating noise device 25 decreases to 0 (zero). That is, when the speed of cooling fans 22 and 23 exceeds the threshold R1 (when the operating oil temperature or coolant temperature exceeds the threshold T1), the operating noise device 25 stops outputting the notification sound. Additionally, when the speed of cooling fans 22 and 23 falls below the threshold R1 (when the operating oil temperature or coolant temperature falls below the threshold T1), the operating noise device 25 outputs a notification sound. This is because when the speed of cooling fans 22 and 23 exceeds the threshold R1, the noise from the cooling fans 22 and 23 alone is enough to inform those around that the machine bodies 2-4 are operating. By controlling the output of the operating noise device 25 in this way, the noise generated by the operating noise device can be suppressed, and the surroundings can be informed that the machine bodies 2-4 are operating. It should be noted that... Figure 5 The characteristics and thresholds R1 and T1 shown can also be set separately for the working oil cooling fan 22 and the cooling water cooling fan 23.

[0031] return Figure 4 The motor control device 36 controls the rotational speed of the electric motor 10 based on the control signal input from the signal output unit 24c. Specifically, it controls the rotational speed of the electric motor 10 to match the rotational speed (indicated speed) indicated by the speed control knob 34.

[0032] Figure 6 This is a flowchart illustrating the processing of the fuselage controller 24 related to the control of cooling fans 22 and 23 and the operating noise device 25. The flowchart illustrates the process from start to finish of the operation. The steps are explained below.

[0033] First, the body controller 24 determines whether it detects that the door lock lever 33 has descended (lock released state) (step S101). If the determination result of step S101 is "no", the determination of step S101 is executed again.

[0034] If the determination result in step S101 is "yes", the operating sound device 25 starts outputting a notification sound (step S102). Thus, while enabling operation of the fuselage 2-4 via the operating levers 31 and 32 (lock-out state), the notification sound output begins. At this time, the volume of the notification sound to be output is based on the pre-acquired rotational speeds of the cooling fans 22 and 23, according to... Figure 5 The characteristic diagram is determined by it.

[0035] Following step S102, the operation of levers 31 and 32 is detected (step S103).

[0036] Following step S103, it is determined whether an increase in working oil temperature or coolant temperature is detected (step S104). If the determination result of step S104 is "no", the determination of step S104 is executed again.

[0037] If the determination result in step S104 is "yes", the rotation speed of the working oil cooling fan 22 or the cooling water cooling fan 23 is increased, and the volume of the working noise device 25 is reduced according to the increase in the rotation speed of the cooling fan 22 or 23 with the higher speed (step S105). As a result, the volume of the working noise device 25 decreases as the noise of the cooling fan 22 or 23 with the higher noise increases.

[0038] Following step S105, determine whether the working oil temperature or coolant temperature exceeds the threshold T1 (step S106). If the determination result of step S106 is "no", return to step S105.

[0039] If the determination result in step S106 is "yes", the output of the notification sound from the working sound device 25 is stopped, and the rotation speed of the working oil cooling fan 22 or the cooling water cooling fan 23 is increased (step S107). Thus, when the noise from the working oil cooling fan 22 or the cooling water cooling fan 23 becomes sufficiently loud, the output of the notification sound stops.

[0040] Following step S107, determine whether the working oil temperature or coolant temperature is below threshold T1 (step S108).

[0041] If the determination result in step S108 is "yes", the rotation speed of the working oil cooling fan 22 or the cooling water cooling fan 23 is reduced, and the working sound device 25 starts outputting a notification sound (step S109). Thus, as the working oil temperature or cooling water temperature decreases, the noise of the louder one of the working oil cooling fan 22 and the cooling water cooling fan 23 becomes smaller, and the notification sound is output.

[0042] Following step S109, or if the determination result of step S108 is "no", determine whether the door lock rod 33 is detected to be lifted (locked state) (step S110). If the determination result of step S110 is "no", the determination of step S110 is executed again.

[0043] If the determination result in step S110 is "yes", the operating sound device 25 stops outputting the notification sound (step S111), and the process ends. Thus, while the operation of the fuselage 2 to 4 via the operating levers 31 and 32 is no longer possible (locked state), the output of the notification sound is stopped.

[0044] Figure 7 This is a flowchart illustrating a modified example of the processing of the fuselage controller 24 related to the control of the cooling fans 22, 23 and the operating sound device 25 in the first embodiment. Figure 6 Similarly, this flowchart illustrates the process of a task from start to finish. The following sections explain each step.

[0045] First, the body controller 24 determines whether the door lock lever 33 has been detected to have descended (lock released state) (step S201). If the determination result of step S201 is "no", the determination of step S201 is executed again.

[0046] If the determination result in step S201 is "yes", the operating sound device 25 starts outputting a notification sound (step S202). Thus, while operations on the fuselage 2-4 via the operating levers 31 and 32 are no longer possible (locked state), the notification sound output begins. At this time, the volume of the notification sound to be output is based on the pre-acquired rotational speeds of the cooling fans 22 and 23, according to... Figure 5 The characteristic diagram is determined by it.

[0047] Following step S202, the displacement of the speed control knob 34 is detected (step S203).

[0048] Following step S203, the rotational speed (indicated speed) indicated by the speed control knob 34 is sent to the motor control device 36 (step S204). This controls the rotational speed of the electric motor 10 to match the indicated speed.

[0049] Following step S204, the rise in working oil temperature or coolant temperature is detected (step S205).

[0050] Following step S205, the fan controllers 22b and 23b are instructed to reduce the working oil temperature or cooling water temperature (step S206).

[0051] Following step S206, determine whether the speed of the working oil cooling fan 22 or the cooling water cooling fan 23 has increased (step S207).

[0052] If the determination result in step S207 is "no", the volume of the notification tone remains unchanged (step S208).

[0053] If the determination result in step S207 is "yes", the duty cycle of the input pulse, which is the control signal to the working sound device 25, is reduced (step S209), and the volume of the notification tone is reduced (step S210).

[0054] Following step S210, it is determined whether the speed of the working oil cooling fan 22 or the cooling water cooling fan 23 exceeds the threshold R1 (step S211).

[0055] If the determination result in step S211 is "yes", the working sound device 25 stops outputting the notification sound (step S212).

[0056] Following step S212, or if the determination result of step S211 is "no", the change in position of the speed control knob 34 is detected (step S213). Here, it is assumed that the speed control knob 34 indicates a decrease in the indicated rotational speed. As a result, the rotational speed of the electric motor 10 decreases, and the temperature of the working oil and cooling water decreases accordingly.

[0057] Following step S213, the speeds of the working oil cooling fan 22 and the cooling water cooling fan 23 are reduced (step S214).

[0058] Following step S214, the operating sound device 25 begins to output a notification sound (step S215). This is because the noise from the cooling fans 22 and 23 alone is insufficient to alert those around that the machine body 2-4 is in operation.

[0059] Following step S215, it is determined whether the door lock lever 33 has been raised (locked state) (step S216). If the determination result of step S216 is "no", the determination of step S216 is executed again.

[0060] If the determination result in step S216 is "yes", the operating sound device 25 stops outputting the notification sound (step S217), and the process ends. Thus, while the operation of the fuselage 2 to 4 via the operating levers 31 and 32 is no longer possible (locked state), the output of the notification sound is stopped.

[0061] (Summarize) In the first embodiment, a hydraulic excavator 1 (electric construction machinery) includes: a lower traveling body 2; an upper slewing body 3 rotatably mounted on the lower traveling body 2; a working device 4 mounted on the upper slewing body 3 and forming the machine body together with the lower traveling body 2 and the upper slewing body 3; an electric motor 10 serving as a power source 9 for the machine body 2 to 4; cooling fans 22 and 23 for cooling a circulating medium circulating within the machine body 2 and 3; and a machine body controller 24 for controlling the rotational speed of the cooling fans 22 and 23. The hydraulic excavator 1 (electric construction machinery) also includes a working sound device 25 that outputs a notification sound to the surrounding area of ​​the machine body during operation of the machine body 2 to 4. The machine body controller 24 controls the working sound device 25 such that, as the rotational speed of the cooling fans 22 and 23 increases, the volume of the notification sound output by the working sound device 25 decreases, and as the rotational speed of the cooling fans 22 and 23 decreases, the volume of the notification sound output by the working sound device 25 increases.

[0062] According to the first embodiment configured as described above, as the operating noise of the cooling fans 22 and 23 increases, the volume of the notification sound output by the operating noise device 25 decreases; conversely, as the operating noise of the cooling fans 22 and 23 decreases, the volume of the notification sound output by the operating noise device 25 increases. This suppresses noise generated by the operating noise device 25 and notifies nearby operators that the machine body 2-4 is in operation. Furthermore, by suppressing the volume of the operating noise device 25, the power consumption of the operating noise device 25 can be reduced, and discomfort caused to the operator and surrounding operators due to excessively loud notification sounds output by the operating noise device 25 can be alleviated. It should be noted that, as... Figure 5 As shown, the speed of cooling fans 22 and 23 is related to the working oil temperature or the cooling water temperature. Therefore, the machine controller 28 can change the volume of the notification sound not directly based on the speed of cooling fans 22 and 23, but based on the working oil temperature or the cooling water temperature (i.e., indirectly based on the speed of cooling fans 22 and 23).

[0063] Furthermore, in the first embodiment, the fuselage controller 24 continuously decreases the volume of the operating sound device 25 according to the increase in the rotational speed of the cooling fans 22 and 23, and continuously increases the volume of the operating sound device 25 according to the decrease in the rotational speed of the cooling fans 22 and 23. This prevents discontinuous changes in the volume of the operating sound device 25, thus further suppressing discomfort to the operator and surrounding staff.

[0064] In addition, in the first embodiment, the hydraulic excavator 1 includes: a working oil tank 20 for storing working oil as the circulating medium, and a cooling water tank 21 for storing cooling water as the circulating medium. The cooling fans 22 and 23 include: a working oil cooling fan 22 for blowing air into the working oil tank 20 to cool the working oil, and a cooling water cooling fan 23 for blowing air into the cooling water tank 21 to cool the cooling water. The machine controller 24 controls the volume of the operating noise device 25 based on the higher of the rotational speeds of the working oil cooling fan 22 and the cooling water cooling fan 23. Therefore, by controlling the volume of the operating noise device 25 according to the increase in the operating noise of the working oil cooling fan 22 and the cooling water cooling fan 23, the noise generated by the operating noise device 25 can be minimized, and the surrounding operators are notified that the machine 2-4 is in operation.

[0065] In addition, in the first embodiment, the hydraulic excavator 1 includes a cab 6 located on the upper slewing body 3 and a door lock lever 33 (locking device) located on the cab 6. The door lock lever 33 (locking device) switches between a locked state that prohibits the operation of the working device 4 and a locked unlocked state that allows the operation of the working device 4. When the door lock lever 33 is switched to the unlocked state, the machine controller 24 controls the working sound device 25 to output the notification sound. When the door lock lever 33 is switched to the locked state, the machine controller 24 controls the working sound device 25 to stop the output of the notification sound. Thus, the notification sound is output when the operation of the machine body 2 to 4 via the operating levers 31 and 32 is possible (locked unlocked state), and the notification sound is stopped when the operation of the machine body 2 to 4 via the operating levers 31 and 32 is not possible (locked state). Example 2

[0066] The second embodiment of the present invention will be described focusing on the differences from the first embodiment. In the second embodiment, a configuration for volume control by adjusting the duty cycle of the input pulse to the operating sound device 25 was described. However, in the second embodiment, a configuration for volume control is described in which multiple sound source data with different volumes are stored in the operating sound device 25, and the sound source data to be used is switched according to the instruction from the body controller 24.

[0067] Figure 8 This is a characteristic diagram showing the relationship between the operating oil temperature or cooling water temperature, the rotational speed of the cooling fans 22 and 23, and the output of the operating sound device 25 in the second embodiment. The operating sound device 25 switches the audio source data to be used so that the volume decreases in stages as the rotational speed of the cooling fans 22 and 23 increases, and increases in stages as the rotational speed of the cooling fans 22 and 23 decreases. In this embodiment, the operating sound device 25 stores three audio source data with different volumes. The operating sound device 25 uses the loudest sound source when the speed of cooling fans 22 and 23 is below threshold R3 (when the working oil temperature or coolant temperature is below threshold T3); it uses a medium-volume sound source when the speed of cooling fans 22 and 23 is above threshold R3 but below threshold R2 (when the working oil temperature or coolant temperature is above threshold T3 but below threshold T2); it uses the quietest sound source when the speed of cooling fans 22 and 23 is above threshold R2 but below threshold R1 (when the working oil temperature or coolant temperature is above threshold T2 but below threshold T1); and it stops outputting when the speed of cooling fans 22 and 23 is above threshold R1 (when the working oil temperature or coolant temperature is above threshold T1). It should be noted that... Figure 8 The characteristics and thresholds R1 to R3 and T1 to T3 shown can also be set separately for the working oil cooling fan 22 and the cooling water cooling fan 23. In addition, the number of sound source data stored in the working sound device 25 is not limited to 3.

[0068] Figure 9 This is a flowchart illustrating the processing of the fuselage controller 24 in the second embodiment related to the control of the cooling fans 22, 23 and the operating sound device 25. Figure 6 Similarly, this flowchart illustrates the process of a task from start to finish. The following describes variations of the first embodiment (such as...). Figure 7 The differences are shown in the figure.

[0069] In the second embodiment, if the determination result of step S207 is "yes", steps S209 and S210 are replaced (e.g., Figure 7 Instead of proceeding as shown), step S210A is executed. In step S210A, the operating sound device 25 is instructed to use sound source data with a volume lower than the currently used sound source data. The method for selecting the sound source data is as follows: Figure 8 As explained.

[0070] (Summarize) In the second embodiment, the fuselage controller 24 causes the volume of the operating sound device 25 to decrease in stages according to the increase in the rotation speed of the cooling fans 22 and 23, and causes the volume of the operating sound device 25 to increase in stages according to the decrease in the rotation speed of the cooling fans 22 and 23.

[0071] According to the second embodiment configured as described above, in the hydraulic excavator 1 equipped with a working sound device 25 that selectively uses multiple pre-saved sound source data, the noise generated by the working sound device 25 can be suppressed, and the surrounding operators can be notified that the machine body 2 to 4 is in operation.

[0072] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments and may include various modifications. For example, the above embodiments are described in detail for ease of understanding of the present invention and are not limited to having all the described configurations. In addition, a part of the configuration of another embodiment may be added to the configuration of a certain embodiment, a part of the configuration of a certain embodiment may be deleted, or a part of another embodiment may be replaced. Explanation of reference numerals in the attached figures

[0073] 1…Hydraulic excavator (electric construction machinery), 2…Lower traveling body (hull), 3…Upper slewing body (hull), 4…Working device (hull), 4A…Swing column, 4B…Boom, 4C…Stick, 4D…Bucket, 4E…Boom cylinder, 4F…Stick cylinder, 4G…Bucket cylinder, 5…Slewing frame, 6…Cab, 6A…Front end, 6B…Rear end, 6C…Left side end, 6D…Right side end, 6E…Upper end, 6F…Door, 7…Cabin cover, 7A…Left lever, 7B…Right lever, 8…Machinery room, 9…Power source, 10…Electric motor, 11…Hydraulic pump, 12…Power cable, 13…Counterweight, 13A…Rear surface, 13B…Maintenance opening, 14…Opening and closing cover, 15…Cable retainer, 20…Working Oil tank, 20a… Oil temperature sensor (temperature sensor), 21… Cooling water tank, 21a… Water temperature sensor (temperature sensor), 22… Working oil cooling fan, 22a… Fan, 22b… Fan controller, 23… Cooling water cooling fan, 23a… Fan, 23b… Fan controller, 24… Body controller, 24a… Signal input unit, 24b… Processing unit, 24c… Signal output unit, 25, 25a, 25b… Working sound device, 30… Seat, 31, 31a, 31b… Travel lever, 32, 32a, 32b… Operation lever, 33… Door lock lever (locking device), 34… Speed ​​control knob, 35a, 35b, 35c… Pressure sensor, 36… Motor control device.

Claims

1. An electric engineering machine, comprising: Lower driving body; An upper rotating body is rotatably mounted on the lower traveling body; A working device installed on the upper rotating body and together with the lower traveling body and the upper rotating body, forms the machine body; An electric motor that serves as the power source for the fuselage; A cooling fan that cools the circulating medium circulating within the fuselage; and The chassis controller that controls the speed of the cooling fan. The electric engineering machinery is characterized by the following features: It is equipped with a working sound device that outputs a notification sound to the surrounding area of ​​the fuselage during operation. The fuselage controller controls the operating sound device so that, as the speed of the cooling fan increases, the volume of the notification sound output by the operating sound device decreases.

2. The electric engineering machinery according to claim 1, characterized in that, The fuselage controller continuously reduces the volume of the operating noise device as the speed of the cooling fan increases.

3. The electric engineering machinery according to claim 1, characterized in that, The chassis controller reduces the volume of the operating sound device in stages as the speed of the cooling fan increases.

4. The electric engineering machinery according to claim 1, characterized in that, have: A working oil tank that stores the working oil used as the circulating medium; and A cooling water tank that stores the cooling water used as the circulating medium. The cooling fan includes: A working oil cooling fan supplies air to the working oil tank to cool the working oil; and A cooling fan supplies air to the cooling water tank to cool the cooling water. The machine controller controls the volume of the operating sound device based on the higher of the rotation speed of the working oil cooling fan and the rotation speed of the cooling water cooling fan.

5. The electric engineering machinery according to claim 1, characterized in that, have: The driver's cab located in the upper rotating body; and A locking device is provided in the cab, which switches between a locked state that prohibits the operation of the working device and a unlocked state that allows the operation of the working device. The fuselage controller controls the operating sound device to output the notification sound when the device switches to the unlocked state via the locking device, and controls the operating sound device to stop the notification sound when the device switches to the locked state via the locking device.

6. The electric engineering machinery according to claim 1, characterized in that, The fuselage controller controls the operating sound device to stop the notification sound when the speed of the cooling fan exceeds a predetermined threshold.

7. The electric engineering machinery according to claim 1, characterized in that, Equipped with a temperature sensor to detect the temperature of the circulating medium. The fuselage controller controls the operating sound device to stop the notification sound when the temperature of the circulating medium detected by the temperature sensor exceeds a predetermined threshold.

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