JP2009097270A - Construction method using battery-driven construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method using a battery-driven construction machine suitable for operation while charging according to the working environment of a construction site. <P>SOLUTION: A battery facility comprises a battery and a charger for charging the battery by a power supply facility installed at the working site. The battery facility capable of quickly charging the battery incorporated in the construction machine with an electric energy stored in the battery is stood ready at the working site in which the construction machine is thrown out. While the battery of the battery facility is charged by the power supply facility, each time the construction machine is connected to the battery facility, the battery of the construction machine is charged with the electric energy stored in the battery is quickly charged to assist the continuous operation of the construction machine. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction method using a battery-driven construction machine capable of efficiently performing construction work using a battery-driven construction machine such as a power shovel that drives a plurality of actuators using a built-in battery as a drive source.

A battery-driven construction machine such as a power shovel (excavator) operates a hydraulic pump using a built-in battery as a driving source, and drives a boom cylinder, an arm cylinder, etc. using hydraulic pressure generated by the hydraulic pump. In combination with the absence of this problem, it is attracting attention as a low vibration / low noise machine suitable for use in urban areas (see, for example, Patent Documents 1, 2, and 3).
Japanese Patent No. 3898775 Japanese Patent Laid-Open No. 10-159133 Japanese Patent Laid-Open No. 10-331204

  By the way, in this type of battery-powered construction machine, the power capacity of the battery (built-in battery; vehicle-mounted battery) that can be mounted on the vehicle body is naturally limited, and currently it is continuously operated for a long time like an engine-driven construction machine. Difficult to do. Incidentally, commercial AC power sources that can be used in construction sites such as urban areas, particularly residential areas, are often of relatively small capacity that are temporarily laid for use in lighting, etc. It is also difficult to quickly charge the internal battery (vehicle battery). Furthermore, it is often difficult to bring a large-capacity power supply car equipped with a generator to this type of construction site.

  The present invention has been made in consideration of such circumstances, and its purpose is to optimally operate the battery-powered construction machine while appropriately charging the built-in battery of the battery-powered construction machine according to the work environment of the construction site. It is providing the construction method using the battery drive construction machine which can do.

In order to achieve the above-described object, the present invention provides a battery-driven construction machine that operates a hydraulic pump using a built-in battery as a drive source, and drives a plurality of actuators using hydraulic pressure generated by the hydraulic pump to engage in construction work. Depending on the construction method used,
A battery and a charging device for charging the battery by a power supply facility provided at a work site, and the battery facility capable of rapidly charging the built-in battery of the battery-driven construction machine with the electric energy stored in the battery. Wait at the work site where the battery-powered construction machine is put in,
Each time the battery-driven construction machine is electrically connected to the battery facility while charging the battery of the battery facility with the power supply facility, the built-in battery of the battery-driven construction machine is stored with the electric energy stored in the battery. Is rapidly charged to assist the continuous operation of the battery-powered construction machine.

  Incidentally, the battery equipment is preferably realized as a self-propelled vehicle that can move on the work site, for example, a battery car mounted on a light four-wheel truck. Moreover, it is preferable that the battery-powered construction machine and the battery equipment are each provided with a power connector for electrically connecting the built-in battery and the battery to each other via a power cable having a predetermined electric capacity. .

  Preferably, the battery-powered construction machine is provided with a switch that cuts off a power supply line from the battery facility, and the battery is cut off when the built-in battery has a shortage of remaining capacity or a failure. It is desirable that the hydraulic pump can be driven by the electric power supplied from the facility so that the operation can be performed even when the built-in battery is electrically disconnected.

  According to the construction method of the battery-driven construction machine having the above-described configuration, the battery-driven construction machine includes a battery and a charging device that charges the battery with a power supply facility provided at a work site, and uses the electric energy stored in the battery. A battery facility capable of rapidly charging the built-in battery waits at a work site where the battery-powered construction machine is put in, and the battery of the battery facility is charged by the power supply facility. As a result, each time the battery-powered construction machine is electrically connected to the battery facility, the built-in battery of the battery-powered construction machine can be rapidly charged with the electric energy stored in the battery. The continuous operation of the construction machine can be effectively assisted.

  That is, even if the commercial AC power supply facility laid in a construction site such as a residential area has a relatively small capacity that can be used for lighting or the like, while charging the battery of the battery facility using the power supply facility, From this battery facility, it becomes possible to quickly charge the built-in battery of the battery-powered construction machine in a short time. Therefore, even if the commercial AC power supply equipment at the construction site has a small capacity, it is possible to shorten the time required for charging the battery-driven construction machine and to operate the battery-driven construction machine efficiently.

  Further, if the battery equipment is configured as a self-propelled vehicle that can move on the work site, for example, a battery car mounted on a light four-wheel truck, the movement can be easily performed according to the environment (situation) of the work site. is there. Further, if the battery-driven construction machine and the battery facility are provided with power connectors for electrically connecting the built-in battery and the battery to each other via a power cable having a predetermined electric capacity, the battery It becomes possible to easily charge the built-in battery of the drive construction machine.

  Furthermore, if the battery-driven construction machine is provided with a function of disconnecting the built-in battery and driving the hydraulic pump by the electric power supplied from the battery equipment, the built-in battery of the battery-driven construction machine is temporarily charged. Even when a failure occurs in the built-in battery, the battery-powered construction machine can be operated with electric power supplied externally from the battery facility. Therefore, it is possible to effectively avoid a situation where the battery-powered construction machine becomes inoperable (stuck) at the construction site.

Hereinafter, a construction method using a battery-powered construction machine according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an outline of the present invention, in which 10 is a battery-driven construction machine that performs civil engineering work at a construction site, and 50 is a battery that is put on standby at the construction site where the battery-driven construction machine 10 is put. This is battery equipment used for charging a built-in battery mounted on the drive construction machine 10. The battery facility 50 is supplied with power from a commercial power source facility (distribution panel) 60 that draws in commercial power from a utility pole 60 in the vicinity of the construction site. It plays a role of rapidly charging the built-in battery of the battery-powered construction machine 10 with the stored power energy. The battery-powered construction machine 10 is a small power shovel having a standard bucket capacity of about 0.16 m ³ , for example, and operates by a hydraulic pump using a built-in battery as a driving source as described later. The boom cylinder and the arm cylinder are driven using the hydraulic pressure.

  In the present invention, at the construction site, while charging the battery of the battery equipment 50 described above with the commercial power supply equipment (distribution panel) 60, the battery-powered construction machine (power excavator) 10 is made to wait for the construction work. When the battery-powered construction machine (power excavator) 10 is electrically connected to the battery-powered construction machine (power shovel) 10 during the idle period, the built-in battery of the battery-powered construction machine (power shovel) 10 is rapidly charged with the electric energy stored in the battery. Thus, the battery-driven construction machine (power excavator) 10 is assisted in continuous operation (operation).

  FIG. 2 shows a schematic configuration diagram of the battery-powered construction machine (power excavator) 10. The vehicle body 1 of the power shovel includes a traveling part 1a and a turning part 1b that is turnable on the traveling part 1a, and a driver's seat is provided on the turning part 1b. A blade 2 is provided at the front portion of the traveling portion 1a in the vehicle body 1 so as to be movable up and down, and a bucket 5 is bent forward and backward via a boom 3 and an arm 4 in front of the driver seat of the turning portion 1b. Is provided. These blade 2, boom 3, arm 4 and bucket 5 are each driven by a hydraulic cylinder which will be described later.

  In particular, this power shovel is of a battery drive type that uses electric power (DC power energy) stored in the built-in battery 6 mounted on the swivel unit 1b as a power source, and replaces the conventional general engine with the built-in battery 6 described above. The hydraulic pump described above is driven by the direct-current power obtained from the electric motor, and the boom cylinder, the boom cylinder, and the like are respectively driven by the hydraulic oil generated by the hydraulic pump. The traveling drive of the traveling unit 1a and the turning of the turning unit 1b are also performed using the hydraulic oil generated by the hydraulic pump.

Incidentally, the built-in battery 6 is composed of, for example, a secondary battery such as a lithium ion battery that obtains a rated output of 160 V _DC, and is mounted in the rear part of the driver seat of the turning unit 1b described above. Further, since the built-in battery 6 itself is a heavy object, it also serves as a weight balance body (counter weight) against a heavy load applied to the boom 3. As described above, the control panel 7 is provided above the built-in battery 6 mounted on the swivel unit 1b. The control panel 7 is provided with the commercial power connection connector 8 and the external battery connection connector 9.

  Now, the control panel 7 responsible for driving the power shovel 10 having the above-described configuration is constructed as shown in FIG. 3, for example. The hydraulic pump 11 that generates high-pressure hydraulic fluid for driving the hydraulic cylinder described above is driven by a three-phase drive type electric motor (three-phase induction motor) 12 having a rated output of about 22 kW, for example. The hydraulic oil generated by the hydraulic pump 11 driven by the electric motor 12 is supplied to the hydraulic cylinder described above via the control valve (C / V) 13, specifically, the boom cylinder 14 or the arm cylinder 15. , And supplied to the bucket cylinder 16 and the like. Needless to say, the operation of the control valve (C / V) 13 is controlled according to the amount of operation of an operation lever (not shown) in the driver's seat.

In order to drive such an electric motor 12 with the DC power energy stored in the built-in battery 6 described above, an inverter 21 for converting the DC power into three-phase 200 V AC power is provided. Specifically, the inverter 21 is configured to generate a three-phase 200V AC power by inputting a 300V DC voltage. The output voltage 160V _DC of the built-in battery 6 is supplied to the inverter 21 after being converted to 300V _DC via a step-up / down regulator (voltage regulator) 22 described later.

The commercial power supply connector 8 converts the commercial three-phase 200V AC power fed from the commercial power supply facility 60 through the commercial power supply connector 8 into a DC power of 300V. An AC / DC converter (AC / DC) 23 is provided, and 300 V _DC output from the AC / DC converter (AC / DC) 23 is also fed to the inverter 21. . The AC / DC converter (AC / DC) 23 converts the _AC power 100V _AC into 300V _DC when a single-phase 100V AC power is input via the commercial power supply connector 8. It also has a function to output. Switching of the operation mode of the AC / DC converter (AC / DC) 23 is performed by a controller 24 described later.

  Further, the power supply line from the external battery connection connector 9 is input to the step-up / step-down device 22 described above. Then, for example, DC power of 250V DC supplied from the battery facility 50 through the external battery connector 9 is boosted and converted to 300V DC by the buck-boost 22 and supplied to the inverter 21 or DC. It is step-down converted to 160 V and supplied to the built-in battery 6. The step-up / step-down operation mode of the step-up / down converter 22 is also controlled by the controller 24 described later.

  Incidentally, for example, as shown in FIG. 4, the step-up / step-down device 22 includes a charging circuit 22a and a boosting circuit 22b, and selectively operates the charging circuit 22a and the boosting circuit 22b by switching and controlling a plurality of switches S1 to S5. Configured to let For example, as shown in FIG. 5, the charging circuit 22a switches the input DC voltage Vin through a switch element SW in series, and the DC power intermittently cut by this is connected to a filter composed of a coil L and a capacitor C. The output voltage Vout is stepped down by filtering (smoothing). Further, for example, as shown in FIG. 6, the booster circuit 22 b boosts the coil C by intermittently switching the resonance current generated between the coil L and the capacitor C by the input DC voltage Vin applied to the coil L by the switch element SW. The output voltage Vout is obtained.

By the way, this power shovel is basically configured to use the above-described built-in battery 6 as a drive source of the vehicle body circuit 25 including the control of the control valve (C / V) 13 and the control of the traveling system. ing. For this reason, the power output line (charge / discharge terminal) of the built-in battery 6 converts the DC power of 160V _DC output from the built-in battery 6 into a _DC voltage of 24V or 12V, which is the driving voltage of the vehicle body system. A direct current converter (DC / DC converter) 26 is provided.

Furthermore, in the input power line extending from the AC / DC converter 23 to the inverter 21, the DC / DC converter (DC) which converts the DC voltage 300V _DC into the vehicle body system driving voltage 24V _DC / 12V _DC described above. / DC converter) 27 is provided. This DC / DC converter (DC / DC converter) 27 is supplied from the AC power supplied from the commercial power source via the commercial power connector 8 or from the battery facility 50 via the external battery connector 9. It plays a role of generating a drive voltage 24V _DC / 12V _DC of the vehicle body system from the DC power. The direct-current voltages (vehicle body system voltages) 24V _DC / 12V _DC generated by the direct-current / direct-current converters (DC / DC converters) 26 and 27 are output via the diodes 26a and 27a, respectively. Electric power is supplied to the vehicle body circuit 25 without interference.

The controller 24 described above operates by receiving the DC voltage 24V _DC / 12V _DC of the vehicle body system when the key switch 28 is turned on, and is realized by, for example, a microcomputer. The controller 24 detects the charging voltage and charging / discharging current of the built-in battery 6 through the sensor 24a and monitors the remaining charge capacity, and uses the sensor 24b incorporated in the commercial power supply connector 8 to The power supply connector 8 is configured to detect power supply from the battery facility 50 via the external battery connection connector 9 by using a sensor 24c incorporated into the external battery connection connector 9 to supply power from a commercial power source. Yes. These sensors 24a, 24b, and 24c are composed of ammeters such as a voltmeter and a current transformer (CT), for example. Then, the controller 24 operates the above-described AC / DC converter (AC / DC) 23 and the step-up / down converter 22 according to the state information detected via each of the sensors 24a, 24b, 24c, and further the hydraulic pump 11 The operation of the regulator 29 that varies the driving conditions is controlled.

  FIG. 7 shows a schematic control procedure of the controller 24. That is, in the controller 24, first, it is determined whether or not commercial AC power is directly supplied from the commercial power facility 60 described above via the commercial power connector 8 (step S1), and commercial AC power is supplied. If it is, the AC / DC converter (AC / DC) 23 is actuated to drive the above-described electric motor 12 using the commercial AC power source as a drive source (step S2). Next, it is determined whether or not the charging button (SW) 30 for the built-in battery 6 is turned on <step S3>. If the charging button 30 is turned on, the charging circuit 22a of the step-up / down booster 22 is activated, The built-in battery 6 is charged using a commercial AC power source as a drive source <Step S4>.

  On the other hand, if there is no supply of commercial power, it is determined whether or not there is power supply from the external battery equipment 50 via the external battery connector 9 <step S5>. When power is supplied from the external battery facility 50, the booster circuit 22a of the step-up / down regulator 22 is operated to drive the above-described electric motor 12 using the external battery as a drive source (step S6). Also in this case, it is determined whether or not the above-described charging button 30 is turned on <step S7>. When the charge button 30 is turned on, the booster circuit 22a in the step-up / down converter 22 is stopped in order to preferentially charge the built-in battery 6 (step S8). The built-in battery 6 is charged by operating the charging circuit 22b of the step-up / down device 22 (step S9).

  If no commercial power is supplied and no electric power is supplied from the external battery B, it is determined whether or not the remaining charge capacity of the internal battery 6 is sufficient <step S10>. If the remaining charge capacity of the built-in battery 6 is sufficient, the above-described hydraulic motor 12 is driven using the built-in battery 6 as a drive source by operating the booster circuit 22a of the step-up / step-down regulator 22 (step S11). However, if the remaining charge of the built-in battery 6 is insufficient, an alarm is issued to warn that the power shovel cannot be operated normally (step S12). In this case, the construction work is stopped in order to quickly recharge the built-in battery 6 and, for example, electrical connection with the battery facility 50 described above is performed.

  With the control procedure as described above, the controller 24 selectively sets the operation mode of the power shovel according to the connection state to the commercial power supply connector 8 and the external battery connection connector 9 and the charge state of the internal battery 6, The operation mode is optimized according to the environment of the construction work site. Specifically, the controller 24 controls the operation of the charging circuit 22a and the boosting circuit 22b while switching the switches S1 to S5 of the step-up / down regulator 22 as shown in FIG. 8, and simultaneously controls the charging / discharging of the built-in battery 6. Then, the drive source of the hydraulic motor 11 is switched.

  In other words, when the hydraulic pump 11 is driven using a commercial power source fed via the commercial power connector 8, the built-in battery 6 is disconnected by turning off all the switches S1 to S5 of the buck-boost 22 and the power shovel is operated. drive. However, when the built-in battery 6 needs to be charged, the switches S1 and S3 are turned on, and the DC power obtained from the AC power source through the AC / DC converter (AC / DC) 23 is applied to the charging circuit 22a. Thus, the built-in battery 6 is charged with the output of the charging circuit 22a.

  When the hydraulic pump 11 is driven using the built-in battery 6, the switch S4 is turned on, and the DC voltage obtained from the built-in battery 6 is boosted through the boost circuit 22b and applied to the inverter 21. Further, when the built-in battery 6 is charged with DC power supplied from the battery facility 50 connected to the external battery connector 9, the charging path of the built-in battery 6 via the charging circuit 22a with the stitches S3 and S5 turned on respectively. Should be formed. When the hydraulic motor 11 is driven using the external battery equipment 50, the stitches S2 and S5 are turned on, and the DC voltage supplied from the external battery B is boosted through the booster circuit 22b and applied to the inverter 21. You can do that. If the built-in battery 6 is out of order, the switches S4 and S5 are turned off so that the built-in battery 6 is disconnected from the controller 24 of the vehicle body circuit 25 and the like.

  According to the power shovel configured as described above, even though it is a battery-driven construction machine that operates the hydraulic pump 11 using the built-in battery 6 mounted on the vehicle body 1 as a drive source, it is connected to the commercial power supply connector 8. The electric motor 12 and thus the hydraulic pump 11 are driven using a commercial AC power supplied from the commercial power source, and the electric motor 12 is driven by the battery equipment 50 connected to the external battery connector 9. Therefore, even when the remaining charge capacity of the internal battery 6 is insufficient or when the internal battery 6 is broken, the external power supply connector 8 or the external battery connection connector 9 can be used from the outside. The power shovel (construction machine) can be operated by supplying power. Therefore, it is possible to effectively avoid the problem that the power shovel (construction machine) is stuck at the construction site due to the problem of the built-in battery 6.

  When the remaining charge capacity of the built-in battery 6 is reduced, it is connected to the external battery connector 9 using a commercial AC power source fed from a commercial power source facility 60 connected to the commercial power source connector 8. Since the built-in battery 6 can be easily charged using the DC power supplied from the battery equipment 50, the insufficient charging of the built-in battery 6 can be easily solved. Further, the AC / DC converter 23 is used to convert the commercial AC power source into DC power to drive the electric motor 12, and the DC motor supplied from the built-in battery 6 or the external battery B is converted into voltage to convert the electric motor. 12 is configured to drive the electric motor 12, for example, by setting the voltage required for driving the electric motor 12 high, the electric motor 12 can be driven efficiently while keeping power conversion loss low. The effect of.

  On the other hand, as shown in FIG. 9, the battery facility 50 described above includes, for example, a battery 51 having a capacity of about 13.8 kWh constructed with 18 lead-acid batteries (64 Ah) for automobiles, and the battery 51. A charging device 52 and the like for charging are provided. Specifically, the battery equipment 50 is configured to supply DC power generated from a commercial AC power source in the charging device 52 to the large-capacity battery 51 via the switch SW1. The DC power stored in the battery 51 is supplied to the battery-powered construction machine (power excavator) 10 through a current breaker 59 in series from a switch SW2 inserted in the discharge path.

  The battery facility 50 charges the battery 51 by the charging device 52 by turning on the switch SW1 and turning off the switch SW2 and turns off the switch SW1. At the same time, the built-in battery 6 of the battery-powered construction machine (power shovel) 10 is rapidly charged with the electric power stored in the battery 51 by turning on the switch SW2. Furthermore, by making both the switches SW1 and SW2 conductive (ON), the driving power is supplied to the battery-driven construction machine (power shovel) 10 while charging the battery 51.

  In particular, the battery facility 50 is realized as a self-propelled vehicle that can move on the work site as shown in FIG. 1, for example, a battery vehicle mounted on a light four-wheel truck. The charging device 52 charges the battery 51 within the range of the capacity of the power supply facility using AC power of 200V / 30A or AC power of 100V / 15A fed from the commercial power supply facility 60. As an output, 250V DC power is obtained.

  Incidentally, for example, as shown in FIG. 10, the charging device 52 includes an excessive current inrush prevention circuit 53 in the AC input stage, and takes in commercial AC power from the inrush prevention circuit 53 through DC conversion through a rectifier 54. Configured. An input DC voltage output from the rectifier 54 and applied to the coil 55 is intermittently controlled by the switch element 56 to generate a resonance current in the coil 55, and the resonance current is taken out via the diode 57. A DC voltage obtained by boosting the input DC voltage is obtained. The battery 51 is charged with the DC voltage boosted in this way.

  The switch element 56 has a power factor correction circuit (PFC circuit) function depending on the input DC voltage applied to the coil 55 and its input current, and the output DC voltage and its output current taken out via the diode 57. On / off control is performed by the charging control circuit 58 provided. By the charging device 52 configured to have such a PFC circuit function, the battery 51 generates a DC voltage having a power capacity corresponding to the power supply status of the commercial power supply facility 60 described above to charge the battery 51. Become.

Further, as described above, the current breaker 59 is provided at the output stage of the battery 51 so that the output current value from the battery 51 is limited. The current breaker 59 prevents a damage accident of the battery 51 due to a short circuit of the output terminal of the battery facility 50 and the like, and a stable DC power supply to the power shovel 10 described above is realized. The built-in battery 6 whose rated output of the power shovel 10 is 160 V _DC is efficiently charged at a high speed by the 250 V DC voltage output from the battery 51.

In other words, the battery facility 50 is configured to be charged by the commercial power source facility 60 and to output a DC voltage 250V _DC higher than the charging voltage 160V _DC of the built-in battery 6 of the excavator 10, thereby The built-in battery 6 can be charged at high speed. The battery 51 of the battery facility 50 and the built-in battery 6 of the power shovel 10 are electrically connected to each other via a dedicated charging cable. In order to connect the power shovel 10 and the battery equipment 50 as necessary using this charging cable, the power shovel 10 is provided with the external battery connector 9 as described above. A connector (not shown) is provided.

  Thus, according to the construction method according to the present invention in which the battery equipment (battery vehicle) 50 configured as described above is put on standby at the construction site where the power shovel (battery-driven construction machine) 10 described above is put in, for example, the battery If the power shovel 10 is fully charged using the facility 50, the power shovel 10 can be separated from the battery facility 50, and can be used for civil engineering work and the like while the power shovel 10 is freely operated at a construction site. During the time when the power shovel 10 is working, the battery 51 of the battery facility 50 disconnected from the power shovel 10 can be recharged using the commercial power source facility 60 described above. Moreover, the battery 51 can be charged without difficulty according to the power supply capacity of the commercial power supply facility 60.

  Then, when the remaining charge capacity of the built-in battery 6 in the power shovel 10 has decreased, the power shovel 10 is connected to the battery equipment 50, so that the power shovel is driven by the DC power stored in the battery equipment 50. Ten built-in batteries can be quickly charged in a short time. Therefore, the power shovel 10 can be engaged in construction work almost continuously without spending much time for charging the built-in battery 6 of the power shovel 10.

  Specifically, in the case of the power shovel 10 capable of continuous operation for about 3 to 4 hours with the built-in battery 6 fully charged, the built-in battery 6 is rapidly charged as the battery device 50 in about 15 to 30 minutes. It is sufficient to build it with a power specification that is possible. With such a configuration, for example, the excavator 10 is used continuously in the morning in civil engineering work on one day, and after recharging the excavator 10 using the lunch break, the excavator 10 is used in the civil engineering in the afternoon. The work can be used again. In this case, it is of course possible to recharge the built-in battery 6 using a temporary break time such as 10:00 or 15:00 as necessary.

  In the battery facility 50, it is only necessary to charge the battery 51 by using the time when the power shovel 10 is not connected, and to wait for the built-in battery 6 of the power shovel 10 to be charged. Even if the power supply capacity of the power supply facility 60 is small, the role can be sufficiently exhibited. Therefore, the field work can be efficiently advanced only by preparing the battery equipment (battery vehicle) 50 at the construction site where the power shovel 10 is introduced.

  Further, if the battery equipment 50 is mounted on a self-propelled vehicle (battery vehicle) as described above, the battery equipment 50 can be easily moved to the work position by the power shovel 10, so that, for example, a power shovel. Even when 10 cannot run due to running out of battery, this can be effectively dealt with. In particular, this type of battery-powered construction machine (power excavator) 10 is often used in an urban area where it is difficult for large construction machines to enter. Therefore, as described above, the battery equipment 50 is mounted on a light four-wheel truck. It can be said that the convenience increases.

  Further, if the battery facility 50 is charged at night when construction work is not performed, for example, even if the power supply capacity of the commercial power facility 60 at the work site is small, the power shovel 10 is operated two to three times. Since it becomes possible to store the amount of electric power that can be charged to some extent, it is possible to sufficiently enhance its convenience. Further, according to the construction method according to the present invention, for example, the power shovel 10 is not operated while pulling the power cable, and therefore, the working action of the power shovel 10 is not hindered.

  The present invention is not limited to the embodiment described above. For example, the voltage value of the DC voltage described above may be set according to the specifications of the battery or the electric motor. Although a small power shovel has been described here as an example, it goes without saying that the present invention can be similarly applied to other battery-powered construction machines. Furthermore, when it is difficult to assist the operation of the power shovel 10 with only one battery facility 50, a plurality of battery facilities 50 are prepared, and the power shovel 10 is cyclically used with these battery facilities 50. It is of course possible to charge the battery. In addition, the present invention can be implemented with various modifications without departing from the spirit of the present invention.

The figure which shows the concept of the construction method which concerns on this invention. The figure which shows the schematic external appearance structure of the power shovel which is one Embodiment of the battery drive construction machine used by this invention. FIG. 2 is a block diagram of a power supply system of the power shovel shown in FIG. 1. The figure which shows the structural example of the buck-boost in the power supply system shown in FIG. The figure which shows the structural example of a charging circuit. The figure which shows the structural example of a booster circuit. The figure which shows the example of the switching control procedure of a power supply. The figure which shows the example of a switching of an operation mode. The figure which shows the structural example of the battery equipment used by this invention. The figure which shows the structural example in the charging device in the battery equipment shown in FIG.

Explanation of symbols

6 Built-in battery 8 Commercial power connector 9 External battery connector 10 Power shovel (battery-driven construction machine)
12 Electric motor 21 Inverter 22 Buck-boost (voltage regulator)
23 AC / DC converter 50 Battery equipment 51 Battery 52 Charging device

Claims (4)

A construction method using a battery-driven construction machine that operates a hydraulic pump using a built-in battery as a drive source, and drives a plurality of actuators using hydraulic pressure generated by the hydraulic pump to engage in construction work,
A battery and a charging device for charging the battery by a power supply facility provided at a work site, and the battery facility capable of rapidly charging the built-in battery of the battery-driven construction machine with the electric energy stored in the battery. Wait at the work site where the battery-powered construction machine is put in,
Each time the battery-driven construction machine is electrically connected to the battery facility while charging the battery of the battery facility with the power supply facility, the built-in battery of the battery-driven construction machine is stored with the electric energy stored in the battery. A construction method using a battery-driven construction machine, wherein the battery-driven construction machine is assisted by rapidly charging the battery-driven construction machine.   The construction method using the battery-powered construction machine according to claim 1, wherein the battery facility is mounted on a self-propelled vehicle that is movable on the work site.   3. The battery according to claim 1, wherein each of the battery-powered construction machine and the battery equipment includes a power connector for electrically connecting the built-in battery and the battery to each other via a power cable. Construction method using a drive construction machine.   The battery-powered construction machine has a switch that cuts off a power supply line from the battery facility, and power is supplied from the battery facility by shutting off the switch when the remaining capacity of the built-in battery is insufficient or failure. The construction method using the battery-powered construction machine according to claim 1, wherein the hydraulic pump can be driven by electric power.

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