JP2014084569A - Electrically-driven construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically-driven construction machine which discharges heat inside a control board while an electrically-driven motor is stopped and can suppress temperature rise in the inside of the control board.SOLUTION: An electrically-driven construction machine includes: a traveling body 1; a revolving superstructure 2 provided on the traveling body 1; a work device 3 provided in the revolving superstructure 2; an electrically-driven motor 5 for driving a hydraulic pump 6 which is a driving source of the work device 3; a control board 50 for controlling the drive of the electrically-driven motor 5; and a first cooling fan 7 driven by the electrically-driven motor 5 and cooling an oil cooler 8. The electrically-driven construction machine is configured so that the control board 50 is cooled by cooling air generated by the first cooling fan 7, and the construction machine is equipped with a second cooling fan 51a provided separately from the first cooling fan 7 and cooling the control board 50 and a controller 53 driving the second cooling fan 51a when the electrically-driven motor 5 is stopped.

Description

  The present invention relates to an electric construction machine such as an electric excavator using electric power as a drive source.

  In recent years, there has been an increasing demand for energy saving and environmental resistance improvement in construction machinery work sites. In response, construction equipment manufacturers are providing electric construction machines that are equipped with electric motors instead of engines and drive hydraulic systems. For example, an electric excavator drives an electric motor with electric power supplied via a cable from a power source installed outside the vehicle body. For this reason, exhaust gas is not discharged from the vehicle body, and further, low noise and excellent environmental resistance. Due to the limited length of the cable, the range of movement is limited, but it is increasingly used in the field of working in a stationary state such as scrap and industrial waste.

  An electric hydraulic excavator is provided with a control panel including a control device for starting and stopping an electric motor, an earth leakage breaker, a converter for generating a control power source for a vehicle body, and the like. These devices in the control panel generate heat when energized, but there is a limit to the operating environment temperature of the device, so it is necessary to discharge heat from the control panel to the outside to suppress the temperature rise inside the control panel .

  As a conventional technique for discharging heat from the control panel, there is a technique disclosed in Patent Document 1. This patent document 1 discloses a hydraulic working machine in which an engine is mounted and a lifting magnet is mounted on an attachment of a working device, unlike a normal electric hydraulic excavator. The hydraulic working machine shown in Patent Document 1 is provided with a control panel for controlling the power supplied to the lifting magnet, and an opening for taking in cooling air for cooling the engine in order to suppress an increase in the internal temperature of the control panel. A control panel is arranged above the. The engine is provided with a cooling fan that rotates synchronously when the engine is driven and generates cooling air. A cooling fin is attached to the control panel, and heat generated in the control panel is transmitted to the cooling air through the cooling fin so as to suppress a temperature rise in the control panel.

JP 2010-95845 A

  In the prior art disclosed in Patent Document 1 described above, cooling air is generated by the cooling fan when the engine is driven, but the cooling fan is also stopped and no cooling air is generated while the engine is stopped. For this reason, when the engine is stopped, the heat inside the control panel cannot be discharged. Therefore, in this prior art, there is a possibility that the life of the devices arranged in the control panel may be reduced due to an increase in the internal temperature of the control panel.

  The present invention has been made from the actual situation in the above-described prior art, and the purpose thereof is an electric construction capable of discharging the heat inside the control panel while the electric motor is stopped and suppressing the temperature rise inside the control panel. To provide a machine.

  In order to achieve this object, the present invention drives a traveling body, a turning body provided on the traveling body, a working device provided on the turning body, and a hydraulic pump serving as a drive source of the working device. An electric motor, a control panel that controls the driving of the electric motor, and a first cooling device that is driven by the electric motor and cools the heat exchanger, and the cooling air generated by the first cooling device In the electric construction machine configured to cool the control panel, the second cooling apparatus is provided separately from the first cooling device and cools the control panel, and the second cooling device is driven when the electric motor is stopped. And a drive control means.

  According to the present invention configured as described above, the control panel includes the second cooling device, and the drive control unit drives the second cooling device while the electric motor is stopped, so that the electric motor is stopped and the first cooling is performed. Even if the apparatus stops, the heat inside the control panel can be discharged through the second cooling device, and the temperature rise inside the control panel can be suppressed.

  The present invention is the above-described invention, comprising: the operating device or an operating device that operates turning or traveling of the vehicle body; and an electric motor control unit that stops the electric motor in response to a neutral operation of the operating device, The control means drives the second cooling device when the electric motor control unit stops the electric motor.

  According to the present invention configured as described above, the function of the electric motor control unit that stops the electric motor by the electric motor control unit when the operator is not operating, that is, according to the neutral operation of the operating device, the so-called auto idle stop function is provided. When working, by driving the second cooling device by the drive control means, the heat inside the control panel can be discharged and the temperature rise inside the control panel can be suppressed.

  According to the present invention, in the invention, the drive control unit is in a situation where the electric motor control unit determines whether or not the electric motor control unit is in a state of stopping the electric motor, and the determination unit is configured to stop the electric motor. When it is determined, a drive signal generation unit that generates a drive signal for driving the second cooling device is provided.

  The present invention is characterized in that, in the above invention, the second cooling device comprises a fan.

  The present invention is the above invention, further comprising temperature detection means for measuring the temperature inside or outside the control panel, wherein the drive control means is configured to change the second cooling device according to the temperature detected by the temperature detection means. It is characterized by controlling.

  According to the present invention configured as described above, the temperature detecting means detects the temperature inside or outside the control panel in an area where the temperature inside the control panel or the outside temperature is fast, such as in a cold region, and when the electric motor is stopped. When the internal or external temperature is lower than the specification temperature of the device, the drive control means can stop the driving of the second cooling device.

  According to the present invention, the second cooling device is driven by the drive control means while the electric motor is stopped, and the heat inside the control panel is discharged through the second cooling device. Can be suppressed. Thereby, the lifetime of the device in a control panel can be improved compared with the past.

It is a figure which shows the electric hydraulic shovel which comprises 1st Embodiment of the electric construction machine which concerns on this invention, and is a perspective view except an electric power supply system | strain. FIG. 2 is a side view of the electric excavator shown in FIG. 1. It is a top view which shows the principal part of the electric hydraulic shovel shown in FIG. It is a longitudinal cross-sectional view which shows the inside of the control panel accommodating part with which the electric hydraulic shovel shown in FIG. 1 is equipped. It is the figure which showed the electrical connection relationship of the driver's cab apparatus, the control panel apparatus, and the electric motor with which the electric hydraulic shovel shown in FIG. 1 is equipped. It is a figure which shows the principal part of another embodiment of the electric construction machine which concerns on this invention, and is the figure which showed the electrical connection relationship of the cab apparatus, the control panel apparatus, and the electric motor.

  Hereinafter, an embodiment of an electric construction machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of an electric hydraulic excavator constituting a first embodiment of an electric construction machine according to the present invention, excluding a power supply system.

  As shown in FIG. 1, the electric excavator according to the first embodiment includes a traveling body 1 having a crawler belt and moving in the front-rear and left-right directions. A swivel body 2 is provided on the traveling body 1. Although the revolving body 2 is not shown, the revolving body 2 can be swiveled with respect to the traveling body 1 by a bearing mechanism interposed between the revolving body 1 and the revolving body 1. Further, the swivel body 2 is provided with a working device 3 at the front, a counterweight 9 at the rear, a cab 10 at the left front, a control panel storage 20 and an oil tank 11 at the right middle. The traveling body 1 and the revolving body 2 described above constitute a vehicle body.

  An electric motor chamber 4 is disposed in front of the counterweight 9. An electric motor 5 and a hydraulic pump 6 that receives driving force from the electric motor 5 and supplies pressure oil to the work device 3 are arranged in the electric motor chamber 4. A first cooling fan 7 serving as a first cooling device is disposed on a portion of the electric motor 5 located on the opposite side of the mounting side of the hydraulic pump 6, that is, on the rotating shaft of the electric motor 5. An oil cooler 8 that cools the pressure oil from the hydraulic pump 6 by heat exchange with the cooling air generated by the first cooling fan 7 is provided on the left side of the first cooling fan 7. The first cooling fan 7 also blows cooling air into the control panel storage unit 20 to cool the inside of the control panel storage unit 20.

  FIG. 2 is a side view showing the main part of the electric excavator shown in FIG.

  As shown in FIG. 2, the driving power of the vehicle body is supplied to the vehicle body via the cable 13 from an external power supply 100 provided outside the vehicle body. The cable 13 is guided by a cable stand 12 that rotates in synchronization with the turning of the revolving structure 2 and guided to the relay box 14. A terminal block is provided in the relay box 14, and an end portion of the cable 13 is attached to the terminal block so as to be connected to a power system on the vehicle body side.

  The vehicle body cover 15 is provided with openings 15 a and 15 b that form cooling air inlets that cool the working oil that is generated by the first cooling fan 7 and passes through the oil cooler 8.

  FIG. 3 is a plan view showing a main part of the electric excavator shown in FIG.

  As shown in FIG. 3, the electric motor chamber 4 includes a counterweight 9 provided after the electric motor 5, a partition wall 17, an outer plate of the oil tank 11, an outer plate 20 a of the control panel storage unit 20, and left and right vehicle body covers. It is composed of a space partitioned by 15 and 16.

  Arrows 31a to 31c indicate the direction of the flow of cooling air sucked from the openings 15a and 15b of the vehicle body left side cover.

  FIG. 4 is a longitudinal sectional view showing the inside of a control panel storage section provided in the electric hydraulic excavator shown in FIG.

  The control panel storage unit 20 is composed of an outer plate that covers the upper, lower, left, and right front and rear surfaces. Among them, openings 21 a and 21 b that form an inlet / outlet of cooling air from the electric motor chamber 4 are provided in the upper part of the outer plates 20 a and 20 b in the front-rear direction. Arrows 32a to 32d indicate the direction of the flow of the cooling air that has flowed in.

  As shown in FIG. 4, a control panel 50 is provided in the control panel storage unit 20 via an anti-vibration rubber 22 that reduces vibration from the vehicle body. A control panel cooling unit 51 is provided on the upper surface of the control panel 50, and an opening 52 is provided on the lower part. The control panel cooling unit 51 includes an opening 51b and a second cooling fan 51a which is provided in the opening 51b and is a second cooling device for discharging the cooling air in the control panel 50 to the outside. Air in the control panel storage 20 flows from the opening 52. Arrows 33a to 33c indicate the flow of the sucked air. The opening 52 may be provided with a dustproof filter.

  FIG. 5 shows an electrical connection relationship between the driver's cab equipment, the control panel equipment, and the electric motor provided in the electric excavator shown in FIG.

  As shown in FIG. 5, the cab 10 is provided with an auto idle stop switch 10a, a vehicle body key switch 10b, and an operation lever 10c. In addition, the control panel 50 controls the start / stop of the electric motor 5 in accordance with the controller 53, which is the drive control means for the second cooling fan 51a, and the signal from the controller 53, in addition to the control panel cooling section 51 described above. An electric motor control unit 54 is provided. Here, the electric motor control unit 54 has a start / stop control function of the electric motor 5 such as an inverter or a star delta circuit, for example, by an external signal. The controller 53 as drive control means is not limited to the control panel 50, and may be disposed in the cab 10, for example.

  The controller 53 receives signals from the auto idle stop switch 10a, the vehicle body key switch 10b, and the operation lever 10c. The controller 53 determines whether or not the electric motor 5 is in a state of stopping, and generates a drive signal for the second cooling fan 51a in accordance with a signal from the determination unit 53a. A drive signal generation unit 53b that controls the drive of 51a and a timer 53c that controls the output time of the drive signal generation unit 53b according to the signal of the determination unit 53a.

  The operation of the present embodiment will be described with reference to FIGS.

  First, the flow of cooling air generated by the first cooling fan 7 that is driven by the electric motor 5 and rotates in synchronization with the electric motor 5 will be described.

  As shown in FIG. 3, the first cooling fan 7 draws outside air from the openings 15 a and 15 b of the vehicle body cover 15, and sequentially flows in the directions indicated by arrows 31 a, 31 b, and 31 c, and the outer plate of the control panel storage unit 20. Reach 20a.

  As shown in FIG. 4, the cooling air that has reached the outer plate 20a of the control panel storage unit 20 flows in from the opening 21a provided in the outer plate 20a, and sequentially flows in the directions indicated by the arrows 32a, 32b, 32c, and 32d. Then, it flows out from the opening 21b provided in the outer plate 20b.

  When the cooling air flows in the direction from the arrows 32a to 32d, the upper part of the control panel cooling unit 51 of the control panel 50 (shaded portion in the figure) becomes negative pressure. As a result, the air in the control panel storage unit 20 is sucked from the opening 52 provided in the control panel 50 and flows in the direction indicated by the arrows 33 a, 33 b, 33 c, and is controlled from the opening 51 b of the control panel cooling unit 51. It flows out of the board 50. The air that has flowed out of the control panel 50 is mixed with the cooling air described above, and flows out of the control panel storage unit 20 through the opening 21b.

  As a result, air heated to a high temperature by heat generated from a device (not shown) in the control panel 50 during energization is discharged out of the control panel 50.

  Next, the flow of cooling air generated by the second cooling fan 51a of the control panel 50 when the electric motor 5 is stopped will be described.

  When the electric motor 5 stops and the first cooling fan 7 stops accordingly, the flow of cooling air indicated by the arrows 32a to 32d shown in FIG. 4 does not occur. Accordingly, the shaded portion in FIG. 4 does not become negative pressure, and the amount of air sucked from the opening 52 of the control panel 50 is remarkably reduced.

  Then, by driving the second cooling fan 51a of the control panel cooling unit 51 as described later, cooling air is sucked from the opening 52 of the control panel 50 and flows in the direction indicated by the arrows 33a, 33b, 33c in order. It flows out of the control panel 50 from the opening 51b of the control panel cooling section 51. Cooling air that has flowed out of the control panel 50 flows out of the control panel storage unit 20 through the openings 21 a and 21 b of the control panel storage unit 20.

  As a result, the air heated to a high temperature in the control panel 50 is discharged outside the control panel 50 in the same manner as when the electric motor 5 is driven.

  Next, with respect to the drive control method of the second cooling fan 51a, two cases are used: (1) a case where the vehicle body key switch 10b is turned off, and (2) a case where the auto idle stop function is activated. Each will be described separately.

  The controller 53 and the second cooling fan 51a are operated by supplying power from a battery (not shown) mounted on the revolving structure 2. When the vehicle body key switch 10b is turned OFF, the controller 53 checks that each control is stopped and then stops the controller 53 itself.

  Further, Sn, An, Ln, Rn, Fn, Pn, Qn, and Mn in FIG. 5 represent control signals, and the subscript n represents n = 1, 2, 3,... According to the difference in state quantity. Identification notation.

(1) Case where the vehicle body key switch 10b is turned OFF When the operator turns the vehicle body key switch 10b from ON to OFF, the vehicle body key switch 10b generates a signal S1 which is a state quantity indicating OFF, and the controller in the control panel 50 53 is output to the determination unit 53a.

  When the determination unit 53a receives the signal S1 from the vehicle body key switch 10b, the determination unit 53a recognizes from the signal S1 that the vehicle body key switch 10b is in an OFF state, and generates signals M1, F1, and R1 that are state quantities corresponding thereto. These are output to the electric motor control unit 54, the drive signal generation unit 53b, and the timer 53c, respectively.

  When the electric motor control unit 54 receives the signal M1 from the determination unit 53a, the electric motor control unit 54 recognizes from the signal M1 that the vehicle body key switch 10b is in the OFF state, and stops driving the electric motor 5.

  When the timer 53c receives the signal R1 from the determination unit 53a, the timer 53c recognizes from the signal R1 that the vehicle body key switch 10b is in an OFF state, and a signal P1 that permits the second cooling fan 51a to drive for a predetermined time set in advance. Is output to the drive signal generator 53b.

  When the signal F1 from the determination unit 53a is input, the drive signal generation unit 53b recognizes from the signal F1 that the vehicle body key switch 10b is in the OFF state. When the signal P1 from the timer 53c is input, the drive signal generation unit 53b receives the second signal from the signal P1. Recognizing that the cooling fan 51a is allowed to drive for a predetermined time, the signal Q1 is output for a predetermined time.

  When the second cooling fan 51a receives the signal Q1 from the drive signal generation unit 53b, the second cooling fan 51a is driven for a predetermined time during which the signal Q1 is input.

  When the predetermined time elapses, the timer 53c generates a signal P2 that does not permit driving of the second cooling fan 51a after the predetermined time elapses, and is output to the drive signal generation unit 53b.

  When the signal P2 is input from the timer 53c, the drive signal generator 53b recognizes that a predetermined time has elapsed from the signal P2, and outputs a signal Q2 for stopping the driving of the second cooling fan 51a.

  The second cooling fan 51a stops driving when receiving the signal Q2 from the drive signal generation unit 53b.

(2) Case in which the auto idle stop function is activated When the vehicle body key switch 10b is in the ON state, the operator turns the auto idle stop switch 10a in the ON state, and further operates the operation lever 10c in a neutral operation, that is, driving the work device 3 When the turning / running operation is stopped, the vehicle body key switch 10b generates a signal S2 indicating a state quantity indicating ON, and the auto idle stop switch 10a generates a signal A1 indicating a state quantity indicating ON. The lever 10c generates a signal L1 indicating the state quantity of the neutral operation. The signals S 2, A 1, L 1 generated in each are output to the determination unit 53 a of the controller 53 in the control panel 50.

  When the determination unit 53a inputs the signal S2 from the vehicle body key switch 10b, the signal A1 from the auto idle stop switch 10a, and the signal L1 from the operation lever 10c, the vehicle body key switch 10b is turned on from the signal S2 and the signal A1 is turned on automatically. Recognizing that the idle stop switch 10a is in the ON state and the operation lever 10c is in the neutral operation state from the signal L1, the signals M2, F2 and R2 corresponding to the state quantities are generated, and the electric motor control unit 54, It outputs to the drive signal generation part 53b and the timer 53c.

  When the signal M2 from the determination unit 53a is input to the electric motor control unit 54, the vehicle body key switch 10b is in the ON state, the auto idle stop switch 10a is in the ON state, and the operation lever 10c is in the neutral operation state based on the signal M2. This is recognized, and the drive of the electric motor 5 is stopped.

  When the timer 53c receives the signal R2 from the determination unit 53a, the timer 53c recognizes from the signal R2 that the vehicle body key switch 10b is in the ON state and the auto idle stop switch 10a is in the ON state, and with respect to driving of the second cooling fan 51a. A signal P3 without time constraint is generated and output to the drive signal generation unit 53b.

  When the signal F2 from the determination unit 53a is input, the drive signal generation unit 53b recognizes from the signal F2 that the vehicle body key switch 10b is in the ON state, the auto idle stop switch 10a is in the ON state, and the operation lever 10c is in the neutral operation state. When the signal P3 from the timer 53c is input, it is recognized that there is no time constraint on the driving of the second cooling fan 51a, and the signal Q1 for driving the second cooling fan 51a is operated while the operation lever 10c is in the neutral operation state. Output.

  When the second cooling fan 51a receives the signal Q1 from the drive signal generator 53b, the second cooling fan 51a is driven during the neutral operation state in which the signal Q1 is input.

  When the operator operates the operation lever 10c again and the neutral state of the operation lever 10c is released, the operation lever 10c outputs a signal L2 representing the neutral operation release state amount to the determination unit 53.

  The determination unit 53 recognizes from the signal S2 that the vehicle body key switch 10b is in the ON state, from the signal A1, the auto idle stop switch 10a is in the ON state, and from the signal L2, the operation lever 10c is in the neutral operation release state. Signals M3 and F3, which are state quantities, are newly generated and output to the electric motor control unit 54 and the drive signal generation unit 53b.

  When the electric motor control unit 54 receives the signal M3 from the determination unit 53a, the vehicle body key switch 10b is in the ON state, the auto idle stop switch 10a is in the ON state, and the operation lever 10c is in the neutral operation release state based on the signal M3. This is recognized, the stop control is canceled, and the electric motor 5 is driven.

  When the signal F3 from the determination unit 53a is input, the drive signal generation unit 53b recognizes from the signal F3 that the vehicle body key switch 10b is in the ON state, the auto idle stop switch 10a is in the ON state, and the operation lever 10c is in the neutral operation release state. Then, a signal Q2 for stopping the driving of the second cooling fan 51a is output.

  When the second cooling fan 51a receives the signal Q2 from the drive signal generator 53b, the second cooling fan 51a stops driving by the signal Q2.

  According to the present embodiment configured as described above, the second cooling fan 51a is driven by the controller 53 while the electric motor 5 is stopped, and the heat inside the control panel 50 is discharged through the second cooling fan 51a. And the temperature rise inside the control panel 50 can be suppressed. Thereby, the lifetime of the equipment in the control panel 50 can be improved.

  Next, a second embodiment of the electric construction machine according to the present invention will be described with reference to the drawings.

  FIG. 6 illustrates a main part of the second embodiment of the electric excavator, and is a diagram illustrating an electrical connection relationship between the driver's cab equipment, the control panel equipment, and the electric motor.

  The second embodiment is also basically an electric hydraulic excavator similar to the first embodiment. A different point is temperature control means for measuring the temperature inside or outside the control panel 50, that is, a temperature sensor 55, and control of the controller 53 according to the temperature detected by the temperature sensor 55.

  The temperature sensor 55 is installed in the control panel 50, for example. The temperature sensor 55 detects the temperature T in the control panel 50 and outputs the detected value of the detected temperature T to the determination unit 53 a of the controller 53.

The determination unit 53 compares the preset temperature threshold Td with the detected value of the temperature T output from the temperature sensor 55, and reflects the result in the signal Fn to the drive signal generation unit 53b. That is,
When T ≧ Td When the vehicle body key switch 10b is OFF or the auto idle stop function is operating, and the temperature T in the control panel 50 is equal to or higher than the temperature threshold Td, the determination unit 53 A signal F1 or F2 for driving the cooling fan 51a is output to the drive signal generator 53b. The drive signal generator 53b outputs a signal Q1 for driving the second cooling fan 51a, and the second cooling fan 51b is driven by the signal Q1.

When T <Td On the other hand, when the temperature T in the control panel 50 is lower than the temperature threshold Td, the judgment is made regardless of the case where the vehicle body key switch 10b is OFF or the auto idle stop function is operating. The unit 53 outputs a signal F4 for stopping the driving of the second cooling fan 51a to the drive signal generation unit 53b. The drive signal generator 53b outputs a signal Q2 for stopping the driving of the second cooling fan 51a, and the second cooling fan 51b stops driving by the signal Q2.

  The installation position of the temperature sensor 55 may be outside such as the outer surface of the control panel 50 as long as an evaluable temperature can be detected, or the temperature sensor 55 may be installed at a plurality of positions inside or outside the control panel 50. Good.

  Further, a plurality of temperature threshold values Td may be set, and the rotation speed of the second cooling fan 51a may be controlled stepwise using an inverter or the like.

  According to the second embodiment configured as described above, the temperature sensor 55 detects the temperature either inside or outside the control panel 50 in an area where the temperature decreases rapidly inside or outside the control panel 50, such as in a cold region, When the electric motor 5 is stopped, if the internal or external temperature is lower than the specification temperature of the device, the controller 53 can stop the driving of the second cooling fan 51a. Thereby, the power consumption of the 2nd cooling fan 51a can be reduced. Other functions and effects are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 3 Working device 4 Electric motor chamber 5 Electric motor 7 1st cooling fan (1st cooling device)
DESCRIPTION OF SYMBOLS 9 Counterweight 10a Auto idle stop switch 10b Car body key switch 10c Operation lever 11 Oil tank 15 Car body cover 15a Opening part 15b Opening part 16 Car body cover 17 Bulkhead 20 Control panel accommodating part 20a Outer plate 20b Outer plate 21a Opening part 21b Opening part 50 Control panel 51 Control panel cooling part 51a Second cooling fan (second cooling device)
51b Opening 52 Opening 53 Controller (Drive Control Unit)
53a determination unit 53b drive signal generation unit 53c timer 54 electric motor control unit 55 temperature sensor (temperature detection means)

Claims (5)

A traveling body, a revolving body provided on the traveling body, a working device provided on the revolving body, an electric motor that drives a hydraulic pump serving as a drive source of the working device, and driving of the electric motor An electric type comprising a control panel to be controlled and a first cooling device that is driven by the electric motor and cools a heat exchanger, and is configured to cool the control panel by cooling air generated by the first cooling device. In construction machinery
An electric type comprising a second cooling device that is provided separately from the first cooling device and that cools the control panel, and drive control means that drives the second cooling device when the electric motor is stopped. Construction machinery. The electric construction machine according to claim 1,
An operating device for operating the working device or turning / running of the vehicle body, and an electric motor controller for stopping the electric motor in response to a neutral operation of the operating device,
The drive control means drives the second cooling device when the electric motor control unit stops the electric motor. The electric construction machine according to claim 2,
When the drive control means determines that the electric motor control unit is in a state of stopping the electric motor, and the determination unit determines that the electric motor is in a state of stopping the electric motor An electric construction machine comprising: a drive signal generation unit that generates a drive signal for driving the second cooling device. The electric construction machine according to claim 3,
The electric cooling machine is characterized in that the second cooling device comprises a fan. The electric construction machine according to any one of claims 1 to 4,
The apparatus includes temperature detection means for measuring the temperature inside or outside the control panel, and the drive control means controls the second cooling device according to the temperature detected by the temperature detection means. Electric construction machine.