Power supply device for electric carry-scraper and electric carry-scraper comprising same

Abstract

The utility model discloses a power supply device for an electric carry-scraper and the electric carry-scraper comprising the power supply device, and belongs to the technical field of engineering machinery. The power supply device comprises a charging device, a direct current distribution box and an auxiliary power supply, the charging device is used for converting alternating current into direct current and providing the direct current for the direct current distribution box, the direct current distribution box is used for tapping the received direct current, and the auxiliary power supply is electrically connected to the charging device and the direct current distribution box; and an auxiliary power supply for receiving power from the charging device and the DC distribution box and supplying power to the DC distribution box, the auxiliary power supply independently supplying power to the electric carry-scraper when the electric carry-scraper needs power and the charging device does not supply power to the electric carry-scraper. The maneuverability of the towing type electric carry-scraper can be improved, the efficiency of an original power system can be improved, and the comprehensive cost of the carry-scraper can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field more specifically, relate to a power supply device for electric shovel and contain its electric shovel. BACKGROUND

[0002] At present, the power transmission system of electric shovel mainly adopts two ordinary three-phase asynchronous motor drive, the main motor drives the torque converter gearbox, and the PTO port of the gearbox drives the auxiliary pump of the hydraulic system such as brake pump and cable winding pump, and the auxiliary motor drives the main hydraulic system to realize the lifting, dumping and whole vehicle steering function of the shovel. The electric shovel takes power from the ground power station during work, and due to the limited distribution position and quantity of underground roadway power station, the electric shovel has the problems of small activity range, unable to realize free transfer between different working faces and the like. SUMMARY

[0003] The utility model discloses a power supply device for electric shovel. The electric shovel includes a drive device, the power supply device includes a charging device, a DC distribution box and an auxiliary power supply, the charging device is used to convert AC into DC and provide DC to the DC distribution box, the drive device is used to receive power from the DC distribution box and feedback power to the DC distribution box, the auxiliary power supply is electrically connected to the DC distribution box, used to provide power to the DC distribution box and receive power from the DC distribution box, when the charging device does not supply power to the electric shovel, the auxiliary power supply supplies power to the electric shovel alone.

[0004] Further, the charging device includes a cable and an AC distribution box, the cable is used to receive AC from an external power supply and transmit AC to the AC distribution box.

[0005] Further, the charging device includes a plurality of on-board chargers, and the AC distribution box taps AC to the plurality of on-board chargers.

[0006] Further, the plurality of on-board chargers are connected in parallel to the DC distribution box.

[0007] Further, the drive device includes a motor controller and a motor, the motor controller is configured to be electrically connected to the motor and used to convert DC into AC to drive the motor, and recover energy from the motor when the electric shovel brakes and goes downhill and reversely store the energy into the auxiliary power supply via the DC distribution box.

[0008] Further, the motor includes a hydraulic drive motor and a traveling drive motor.

[0009] Further, the power supply device further comprises a whole machine controller, which is configured to: simultaneously supply power to the electric shovel by the plurality of on-board chargers and the auxiliary power supply when the electric shovel is in a first load state; supply power to the electric shovel by the plurality of on-board chargers alone when the electric shovel is in a second load state; and charge the auxiliary power supply by the plurality of on-board chargers when the electric shovel is in a third load state.

[0010] Further, the power supply device further comprises a DC-DC converter, which is electrically connected to the DC distribution box, for converting power received from the DC distribution box for use by the whole machine controller.

[0011] Additionally or optionally, the power supply device further comprises an AC transformer for transforming AC power to be compatible with the plurality of on-board chargers.

[0012] The utility model further provides an electric shovel comprising the aforementioned power supply device.

[0013] The utility model has the advantages that: since the electric shovel of the utility model can use power from the auxiliary power supply when changing sites, the utility model can improve the mobility of the electric shovel with trailing electric power. Moreover, when the electric shovel of the utility model is in a full load state and needs high power, the on-board charger and the auxiliary power supply of the utility model can supply power simultaneously, so the utility model can improve the efficiency of the original power system. In addition, the electric shovel of the utility model can reversely store power into the auxiliary power supply when braking and going downhill, so the utility model can reduce the comprehensive cost of the electric shovel. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a side view of the electric shovel according to the utility model;

[0015] Figure 2 is a component composition diagram of the power supply device for the electric shovel according to the utility model;

[0016] Figure 3 is a detailed structure block diagram of the power supply device for the electric shovel according to the utility model.

[0017] REFERENCE NUMERALS IN DRAWINGS:

[0018] 100, electric shovel; 10, charging device; 20, auxiliary power supply; 30, DC distribution box; 40, driving device. DETAILED DESCRIPTION

[0019] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings and examples.

[0020] The electric powered scrapers are classified into four types according to the power supply mode, including a trailing power supply type electric powered scraper, a wire line type electric powered scraper, a cable-wire line combined type electric powered scraper and a battery power supply type electric powered scraper.

[0021] The trailing power supply type electric powered scraper is limited by the trailing cable, and the mobility and the moving range are greatly limited, which may affect the running speed and the operation flexibility.

[0022] The utility model is particularly improved for the existing trailing power supply type electric powered scraper, so that the trailing power supply type electric powered scraper according to the utility model is better than the existing trailing power supply type electric powered scraper and the battery power supply type electric powered scraper as a whole.

[0023] Referring to Figure 1 and Figure 2 , Figure 1 is a side view of the electric powered scraper 100 according to the utility model. Figure 2 is a component composition diagram of the power supply device for the electric powered scraper 100 according to the utility model.

[0024] In an embodiment of the utility model, the auxiliary power supply 20 can be a power battery, and it should be noted that other energy storage devices, such as super capacitors, can also be used as the auxiliary power supply 20.

[0025] The on-board charger in the electrically towed scraper 100 is used to convert alternating current into direct current, which generally includes: an input port, through which the on-board charger is connected to an external power source; a rectifier filter circuit, through which the input alternating current is converted into direct current (DC) for subsequent charging use; a power factor correction (PFC) circuit, which is used to shape and adjust the input current to approximate a sine wave, thereby improving energy utilization efficiency and reducing interference with the power grid; an output port, through which the adjusted direct current is connected to the battery of the electric scraper 100 to charge the battery; and a control circuit for monitoring and adjusting the charging process, including control of parameters such as charging current, voltage, temperature, etc., to ensure charging safety and efficiency.

[0026] The on-board charger generally uses efficient charging technology, which can quickly and safely charge the battery, and has multiple protection mechanisms built in, such as overcharge protection, overcurrent protection, and overheat protection, to ensure the safety and reliability of the charging process. In addition, the on-board charger generally has good compatibility, which can adapt to different types of batteries and charging interfaces. Modern on-board chargers usually have intelligent charging functions, which can automatically adjust charging parameters according to the actual situation of the battery to achieve optimal charging results.

[0027] In one embodiment of the present application, the charging device 10 further includes a cable and an AC distribution box. The cable is used to transmit alternating current from an external power source to the AC distribution box. The AC distribution box is used to tap the alternating current to the on-board charger and provide overcurrent and ground protection. The on-board charger is used to convert alternating current into direct current and provide direct current to the DC distribution box 30. The DC distribution box 30 is used to tap the direct current to the DC-DC converter and the motor controller, and receive power from the motor controller and the auxiliary power supply 20, and provide overcurrent and ground protection. The motor controller is electrically connected to the motor and is used to convert direct current into alternating current to drive the motor. Optionally, the charging device 10 can also include an AC transformer for transforming alternating current to adapt to the on-board charger. In addition, the DC-DC converter can convert the direct current from the DC distribution box 30 into 24-volt direct current for the overall machine controller.

[0028] In one embodiment of the present application, the motor includes a hydraulic drive motor and a travel drive motor. The hydraulic drive motor drives the hydraulic pump set through the transmission box, thereby realizing the lifting and turning of the bucket of the scraper 100 and the steering of the scraper 100. The travel drive motor transmits power to the front axle and rear axle through the transmission box, thereby driving the scraper 100 to move. The motor can use an alternating current motor, which can include an asynchronous motor (such as an induction motor) or a synchronous motor (such as a permanent magnet synchronous motor).

[0029] In an embodiment of the present application, the vehicle-mounted chargers include a plurality of vehicle-mounted chargers, the number of vehicle-mounted chargers is mainly determined according to the total power of the motor scraper, the vehicle-mounted chargers can provide direct current for the motor controller, and the power battery is charged when the motor scraper 100 is in a standby state. These vehicle-mounted chargers can be connected in parallel, thereby solving the problem of insufficient power of a single charger, and the motor scraper 100 can be continuously powered to ensure continuous operation of the motor scraper 100 when individual chargers fail.

[0030] In addition, the charging device 10 also includes a whole machine controller (also known as a central controller or a main controller), which mainly includes a microprocessor, a memory and a communication interface. The whole machine controller is responsible for coordinating and controlling the vehicle-mounted chargers, motor controllers and auxiliary power supplies 20 of the motor scraper 100, etc., to ensure that the motor scraper 100 can operate efficiently and safely. In an embodiment of the present application, the whole machine controller communicates with the vehicle-mounted chargers, motor controllers and auxiliary power supplies 20, etc. through a CAN (Controller Area Network) bus.

[0031] The whole machine controller can optimize the output power and torque of the motor according to the working state, load condition and battery state of the motor scraper 100, etc., to achieve the best energy utilization and efficiency. The communication interface of the whole machine controller enables communication with the control panel of the operator, the remote monitoring system and other control systems, realizes data transmission and sharing, and the communication interface can be wired or wireless and comply with specific communication protocols. The whole machine controller supports programming and configuration functions, allowing the operator to adjust and optimize the performance of the motor scraper 100 according to actual needs to adapt to different working environments and job requirements.

[0032] In an embodiment of the present application, the whole machine controller is configured to cause the vehicle-mounted chargers to supply power simultaneously with the auxiliary power supply 20 when the electric motor scraper 100 is in a first load state. For example, the first load state can be a full load state. The whole machine controller is configured to supply power to the electric motor scraper 100 from the vehicle-mounted chargers alone when the electric motor scraper 100 is in a second load state. For example, the second load state can be a medium load or low load state. The whole machine controller is configured to cause the vehicle-mounted chargers to charge the auxiliary power supply 20 when the electric motor scraper 100 is in a third load state. For example, the third load state can be a standby state.

[0033] As mentioned above, the motor controller includes a PLC (programmable logic controller), a microprocessor or the like controller, and has the function of an inverter. In an embodiment of the present application, the motor controller can not only control the start, stop, speed adjustment and operation monitoring of the motor according to the signals from the whole machine controller, but also can convert the direct current from the direct current distribution box 30 into alternating current to drive the motor, and the motor controller is further configured to recover energy from the motor when the electric shovel 100 brakes and goes downhill and reversely store the energy into the auxiliary power supply 20 via the direct current distribution box 30.

[0034] According to the power supply device of the present application, when the electric shovel 100 is not externally connected to external power, i.e. the on-board charger does not supply power, the auxiliary power supply 20 alone supplies power to the electric shovel 100 to realize the basic functions of the electric shovel 100, thereby realizing the free site transfer of the electric shovel 100.

[0035] In summary, the electric shovel 100 of the present application can use power from the auxiliary power supply 20 when transferring sites, so the mobility of the electric shovel 100 can be improved. When the electric shovel 100 of the present application is in a full load state and needs high power, the on-board charger and the auxiliary power supply 20 of the present application can supply power at the same time, which can improve the efficiency of the original power system. In addition, the electric shovel 100 of the present application can reversely store power into the auxiliary power supply 20 when braking and going downhill, thereby reducing the overall cost of the electric shovel 100.

[0036] The above describes the present application and its embodiments in a schematic manner, which is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the spirit of the present application, similar structural modes and embodiments can be designed without creative design, which should belong to the protection scope of the present application.

Claims

1. A power supply device for an electric scraper, characterized in that: include: A charging device (10), a DC distribution box (30) and an auxiliary power supply (20), wherein the charging device (10) is used to convert AC power into DC power and provide the DC power to the DC distribution box (30), and the DC distribution box (30) is used to tap the received DC power. The auxiliary power supply (20) is electrically connected to the charging device (10) and the DC distribution box (30) and is used to receive power from the charging device (10) and the DC distribution box (30) and provide power to the DC distribution box (30). When the electric scraper needs power but the charging device (10) does not supply power to the electric scraper, the auxiliary power supply (20) supplies power to the electric scraper alone.

2. The power supply device for an electric scraper according to claim 1, characterized in that: The charging device (10) comprises a cable and an AC distribution box, wherein the cable is used to receive AC power from an external power source and transmit the AC power to the AC distribution box.

3. The power supply device for an electric scraper according to claim 2, characterized in that: The charging device (10) comprises a plurality of on-board chargers, and the AC distribution box distributes AC power to the plurality of on-board chargers.

4. The power supply device for an electric scraper according to claim 3, characterized in that: The plurality of on-board chargers are connected in parallel to the DC distribution box (30).

5. The power supply device for an electric scraper according to claim 4, characterized in that: The electric scraper further includes a drive device (40), which is used to receive power from the DC distribution box (30) and feed power back to the DC distribution box (30). The drive device (40) includes a motor controller and a motor. The motor controller is configured to be electrically connected to the motor and used to convert DC power into AC power to drive the motor, and recover energy from the motor when the electric scraper is braking and going downhill, and store the energy in reverse to the auxiliary power supply (20) via the DC distribution box (30).

6. The power supply device for an electric scraper according to claim 5, characterized in that: The motors include a hydraulic drive motor and a travel drive motor.

7. The power supply device for an electric scraper according to claim 6, characterized in that: The invention also includes a whole machine controller, which is configured to: when the electric scraper is in a first load state, enable the multiple on-board chargers and the auxiliary power supply (20) to supply power simultaneously; when the electric scraper is in a second load state, enable the multiple on-board chargers to supply power to the electric scraper alone; and when the electric scraper is in a third load state, enable the multiple on-board chargers to charge the auxiliary power supply (20).

8. The power supply device for an electric scraper according to claim 7, characterized in that: It also includes a DC-DC converter, which is electrically connected to the DC distribution box (30) and is used to convert the power received from the DC distribution box (30) for use by the whole machine controller.

9. The power supply device for an electric scraper according to claim 8, characterized in that: An AC transformer is also included for converting the AC power so as to be compatible with the plurality of on-board chargers.

10. An electric scraper, characterized in that: The invention comprises a power supply device for an electric scraper according to any one of claims 1 to 9.

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