Self-power generation power supply device and power supply method for tower crane hook equipment

Abstract

The present invention discloses a self - generating power supply device and a power supply method for a tower crane hook device. The self - generating power supply device includes a friction wheel. The rolling surface of the friction wheel contacts the wire rope close to the assembly plate. The rotating shaft of the friction wheel is connected to the mechanical force input shaft of a DC generator. The friction wheel rotates under the friction of the wire rope under the action of the movement of the wire rope, so as to drive the DC generator to generate electricity. Thus, the DC generator charges the rechargeable battery of the rechargeable battery assembly. The power output of the rechargeable battery is divided into two paths. One path directly supplies power to the processor and the inertial sensor, and the other path supplies power to the electrical equipment installed on the hook device via an electric control switch. The inertial sensor installed on the hook device is connected to the processor, and the processor controls the opening and closing of the electric control switch. The present invention can utilize the kinetic energy of the wire rope to generate electricity by itself to continuously supply power to the electrical equipment on the hook device, which is easy to implement, low in cost and suitable for popularization.

Description

Technical Field

[0001] The present invention relates to a self - generating power supply device for a tower crane hook device and a power supply method thereof, belonging to the field of power generation and power supply equipment. Background Art

[0002] A tower crane, also known as a "tower hoist", is a commonly used lifting device on construction sites at present. The hook device used for lifting operations thereon usually includes an assembly plate 12. Please refer to Figure 2 to understand that a hook 11 and a pulley block 13 are installed on the assembly plate 12, and a steel wire rope 14 connected to a tower crane control device (not shown in the figure) of the tower crane is wound around the pulley block 13. During lifting, workers control the retraction and release of the steel wire rope 14 through the tower crane control device to control the movement of the hook 11. Due to the characteristics of the hook having frequent movement and a large range, etc., therefore, in order to ensure safe construction, the real - time positioning of the hook 11 position is particularly important.

[0003] Currently, the commonly used positioning measures are to install positioning devices such as indicator lights or locators on the hook 11 or the assembly plate 12 that can feedback the hook position in real - time, and these positioning devices need continuous power supply to work properly. Given the current situation that it is difficult to lay power cables on the hook device, the existing power supply methods mainly include high - capacity batteries and solar panels. However, it can be found from actual implementation that the battery is limited by its capacity. No matter how high the capacity is, it needs to be replaced regularly, which brings many difficulties to construction management, and repeated disassembly and assembly of the battery are likely to cause loosening problems, there are certain safety hazards. And the solar panel will be affected by the working conditions of the hook (such as being blocked by high - rise buildings, etc.) and the weather (such as encountering continuous cloudy weather), etc., and is easily damaged (such as being broken by collision), and cannot guarantee continuous power supply. In addition, the power supply method based on radio technology has not been applied to the hook device because of its high implementation cost, electromagnetic interference and poor transmission efficiency, etc. Summary of the Invention

[0004] The purpose of the present invention is to provide a self - generating power supply device and a power supply method for a tower crane hook device, which can generate electricity by itself using the kinetic energy of the steel wire rope to continuously supply power to the electrical equipment on the hook device, is easy to implement, has a low cost, and is suitable for popularization.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A self - generating power supply device for a tower crane hook device. The hook device includes an assembly plate, on which a hook and a pulley block are installed. A steel wire rope is wound around the pulley block, and the movement of the steel wire rope is controlled by a tower crane control device. It is characterized in that: the self - generating power supply device for the tower crane hook device includes a friction wheel, the rolling surface of the friction wheel contacts the steel wire rope close to the assembly plate, the rotating shaft of the friction wheel is connected to the mechanical force input shaft of a DC generator, and the friction wheel rotates under the friction of the steel wire rope under the action of the movement of the steel wire rope to drive the DC generator to generate electricity, so that the DC generator charges the rechargeable battery of the rechargeable battery assembly; the power output of the rechargeable battery is divided into two paths, one path directly supplies power to the processor and the inertial sensor, and the other path supplies power to the electrical equipment installed on the hook device via an electric control switch; the inertial sensor installed on the hook device is connected to the processor, and the processor controls the opening and closing of the electric control switch.

[0007] A power supply method implemented based on the above - mentioned self - generating power supply device for a tower crane hook device, which is characterized in that it includes the steps:

[0008] 1) When the friction wheel rotates under the friction action generated by the moving steel wire rope, the rotation of the friction wheel drives the DC generator to generate electricity, and then the DC generator charges the rechargeable battery;

[0009] 2) The rechargeable battery supplies power to the processor and the inertial sensor;

[0010] 3) The inertial sensor transmits the detected hook state information to the processor, and at the same time the battery power monitoring circuit transmits the monitored battery power information to the processor;

[0011] 4) The processor controls the opening and closing of the electric control switch according to the received hook state information and battery power information, where:

[0012] If the processor determines through the hook state information that the hook is in a moving state at this time, and determines through the battery power information that the rechargeable battery can supply power externally at this time, the processor controls the electric control switch to open, so that the rechargeable battery supplies power to the electrical equipment to make the electrical equipment put into operation;

[0013] If the processor determines through the hook state information that the hook transitions from a moving state to a non - moving state, and determines through the battery power information that the rechargeable battery can supply power externally at this time, the processor controls the electric control switch to change from open to closed after a predetermined time delay, so that the rechargeable battery continues to supply power to the electrical equipment within the predetermined time, and the electrical equipment continues to operate within the predetermined time;

[0014] If the processor determines that the hook has been in a non-moving state continuously within the determination time through the hook status information, or the processor determines that the rechargeable battery cannot supply power externally at this time through the battery power information, the processor controls the electric control switch to close, so that the rechargeable battery does not supply power to the electrical equipment, and the electrical equipment stops operating;

[0015] 5) Return to 1).

[0016] The advantages of the present invention are:

[0017] 1. The present invention does not require any power cables to be laid on the hook device. Only by using the kinetic energy generated by the steel wire rope connected to the hook device can self-power generation be achieved without modifying the original structure of the hook device, and there is no problem of repeated disassembly and assembly. During the tower crane operation, the electrical equipment installed on the hook device can be continuously powered, and it is not affected by reasons such as the working conditions of the hook (such as being blocked by high-rise buildings) and the weather (such as continuous cloudy weather), improving construction safety.

[0018] 2. The present invention is easy to implement, has a low cost, and is not easily damaged (such as being damaged by collision), and is suitable for popularization.

[0019] 3. Through the design of the inertial sensor and the rechargeable battery control logic, the present invention avoids the situation where the power generation voltage (or power) is insufficient to supply power due to the low-speed operation of the hook, and can automatically enable the power of the rechargeable battery to supply power after sensing a large movement of the hook.

[0020] 4. The present invention is particularly suitable for powering positioning devices (such as indicator lights, locators), ensuring the real-time feedback of the positioning device on the position of the hook during operation. Description of the Drawings

[0021] Figure 1 is a schematic composition diagram of the self-power generation power supply device of the present invention.

[0022] Figure 2 is a schematic diagram of the self-power generation power supply device of the present invention used on the tower crane hook device. Detailed Embodiments

[0023] The self-power generation power supply device of the present invention is used for the hook device of a tower crane. As Figure 2 shown, the hook device 10 includes an assembly plate 12. A hook 11 and a pulley block 13 are installed on the assembly plate 12. A steel wire rope 14 is wound around the pulley block 13. The movement of the steel wire rope 14 is controlled by a tower crane control device (not shown in the figure), that is, the tower crane control device of the tower crane controls the movement of the steel wire rope 14 to achieve the control of the movement of the hook 11. The hook device 10 is an existing device in the tower crane field.

[0024] As Figure 1 andFigure 2 As shown in the figure, the self - generating power supply device for the tower crane hook equipment of the present invention includes a friction wheel 20. The rolling surface of the friction wheel 20 contacts the steel wire rope 14 close to the assembly plate 12. The rotating shaft of the friction wheel 20 is connected to the mechanical force input shaft of the DC generator 30. The friction wheel 20 rotates under the friction of the steel wire rope 14 due to the movement of the steel wire rope 14, so as to drive the DC generator 30 to generate electricity. Thus, the DC generator 30 charges the rechargeable battery 51 of the rechargeable battery assembly 50, that is, the power output port of the DC generator 30 is connected to the charging port of the rechargeable battery 51. The power output of the rechargeable battery 51 is divided into two paths. One path directly supplies power to the processor 60 and the inertial sensor 70, and the other path supplies power to the electrical equipment 200 installed on the hook equipment 10 via the electric control switch 90. That is, the power output port of the rechargeable battery 51 is divided into two paths. One path is directly connected to the power supply ports of the processor 60 and the inertial sensor 70, and the other path is connected to the power supply port of the electrical equipment 200 via the electric control switch 90. The signal port of the inertial sensor 70 installed on the hook equipment 10 is connected to the corresponding signal port of the processor 60, and the processor 60 controls the opening and closing of the electric control switch 90, that is, the control port of the processor 60 is connected to the controlled port of the electric control switch 90.

[0025] As Figure 1 , the rechargeable battery assembly 50 further includes a power quantity monitoring circuit 53 for monitoring the output voltage of the rechargeable battery 51. The monitoring port of the power quantity monitoring circuit 53 is connected to the detection port of the rechargeable battery 51, that is, the monitoring port of the power quantity monitoring circuit 53 is connected to the power output port of the rechargeable battery 51, and the signal transmission port of the power quantity monitoring circuit 53 is connected to the corresponding signal port of the processor 60.

[0026] In the present invention, the power quantity monitoring circuit 53 is a well - known circuit in the art, and its composition form is not limited.

[0027] In actual design, the rotating shaft of the friction wheel 20 is directly connected to the mechanical force input shaft of the DC generator 30, that is, the rotating shaft of the friction wheel 20 and the mechanical force input shaft of the DC generator 30 are coaxially arranged. Of course, the connection between the friction wheel 20 and the DC generator 30 can also be designed in other forms, which is not limited.

[0028] As Figure 2 , preferably, a friction wheel 20 is provided on each side of the steel wire rope 14. The two friction wheels 20 are fixed to the assembly plate 12 through the same support frame 40. One of the two friction wheels 20 is connected to the DC generator 30, where: the rolling surface of the friction wheel 20 in contact with the steel wire rope 14 is an arc - shaped concave surface to increase the friction force.

[0029] As Figure 1, the rechargeable battery assembly 50 further includes a charging circuit 52. The charging circuit 52 is connected between the power output port of the DC generator 30 and the charging port of the rechargeable battery 51, and the charging start / stop control port of the charging circuit 52 is connected to the corresponding signal port of the processor 60.

[0030] Furthermore, the charging circuit 52 includes a filter for filtering signal interference and a voltage regulator for adjusting the voltage value. The power output port of the DC generator 30 is sequentially connected to the charging port of the rechargeable battery 51 via the filter and the voltage regulator, and the control port of the voltage regulator is connected to the corresponding signal port of the processor 60.

[0031] In the present invention, the charging circuit 52 is a well-known circuit in the art and can also be designed in other forms of composition without limitation.

[0032] Such as Figure 1 , the rechargeable battery assembly 50 further includes an output interface 54. The power output port of the rechargeable battery 51 is connected to the power supply ports of the processor 60, the inertial sensor 70, and the input port of the electric control switch 90 via the output interface 54. In the present invention, the output interface 54 is a well-known interface circuit in the art, and an ordinary interface can be selected, and the specific composition will not be described in detail here.

[0033] In actual design, the processor 60 performs wireless communication with a remote center (not shown in the figure) through the communicator 80 to upload the working state of the present invention at this time (such as sleep, power supply, etc.) to the remote center for relevant personnel to view. In actual implementation, the communicator 80 can be powered by the rechargeable battery 51, that is, the power output port of the rechargeable battery 51 is connected to the power supply port of the communicator 80 via the output interface 54.

[0034] In actual design, the rechargeable battery assembly 50, the processor 60, the inertial sensor 70, and the electric control switch 90 can be arranged in a protective case 100 installed on the mounting plate 12.

[0035] In the present invention, the electrical device 200 can be a positioning device for calibrating the position of the lifting hook 11. Among them, the positioning device is an indicator light or a locator, and the indicator light and the locator are usually installed on the mounting plate 12. Of course, the electrical device 200 can also be other electronic devices without limitation.

[0036] Based on the self-powered power supply device for the tower crane lifting hook device of the present invention, the present invention also proposes a power supply method, which includes the steps:

[0037] 1) When the friction wheel 20 rotates under the frictional action generated by the moving steel wire rope 14, the rotation of the friction wheel 20 drives the DC generator 30 to generate electricity, and thus the DC generator 30 charges the rechargeable battery 51;

[0038] 2) The rechargeable battery 51 supplies power to the processor 60 and the inertial sensor 70;

[0039] 3) The inertial sensor 70 transmits the detected hook status information to the processor 60, and at the same time, the power monitoring circuit 53 transmits the monitored battery power information to the processor 60;

[0040] 4) The processor 60 controls the opening and closing of the electric control switch 90 according to the received hook status information and battery power information, where:

[0041] If the processor 60 determines through the hook status information that the hook 11 is in a moving state at this time, and determines through the battery power information that the rechargeable battery 51 can supply power externally at this time, the processor 60 controls the electric control switch 90 to open, so that the rechargeable battery 51 supplies power to the electrical equipment 200, enabling the electrical equipment 200 to be put into operation. At this time, the working state of the present invention is power supply;

[0042] If the processor 60 determines through the hook status information that the hook 11 transitions from a moving state to a non-moving state, and determines through the battery power information that the rechargeable battery 51 can supply power externally at this time, the processor 60 controls the electric control switch 90 to change from open to closed after a predetermined time delay. Thus, the rechargeable battery 51 continues to supply power to the electrical equipment 200 within the predetermined time, and the electrical equipment 200 continues to operate within the predetermined time. At this time, the working state of the present invention is power supply;

[0043] If the processor 60 determines through the hook status information that the hook 11 remains in a non-moving state continuously within the determination time (such as ten minutes), or the processor 60 determines through the battery power information that the rechargeable battery 51 cannot supply power externally at this time, the processor 60 controls the electric control switch 90 to close. Thus, the rechargeable battery 51 does not supply power to the electrical equipment 200, and the electrical equipment 200 stops operating. At this time, the working state of the present invention is sleep;

[0044] 5) Return to 1) until the tower crane stops working, or the hook device stops working.

[0045] In actual implementation, the power supply method of the present invention is particularly suitable for powering the positioning device to calibrate the position of the hook 11 when the hook is in the working state, especially in the moving state, so as to ensure production safety. The positioning device can be an indicator light or a locator. For example, when the hook 11 moves and powers the indicator light, the lighting of the indicator light can calibrate the position of the hook 11 in real time. Another example is that when the hook 11 moves and powers the locator, the locator starts to operate and sends a signal representing the position of the hook 11 to the remote center in real time.

[0046] In the present invention, the inertial sensor 70 can detect the state of the lifting hook 11, such as the movement time and movement amplitude of the lifting hook 11. When the hook state information received by the processor 60 indicates that the movement time of the lifting hook 11 reaches the set time length or the movement amplitude of the lifting hook 11 reaches the set threshold, the processor 60 determines that the lifting hook 11 is in a moving state, such as when the lifting hook 11 is hoisting an object or moving up and down without load. On the contrary, when the hook state information received by the processor 60 indicates that the movement time of the lifting hook 11 does not reach the set time length and the movement amplitude of the lifting hook 11 does not reach the set threshold, the processor 60 determines that the lifting hook 11 is in a non-moving state, such as when the lifting hook 11 makes an instantaneous swing due to strong wind (the instantaneous swing caused by wind will not cause a large swing of the lifting hook like when hoisting an object).

[0047] In the present invention, the battery power information monitored by the power monitoring circuit 53 is the current power of the rechargeable battery 51, and the power of the rechargeable battery 51 can be obtained by monitoring the output voltage of the rechargeable battery 51. When the power of the rechargeable battery 51 is less than or equal to the lower limit threshold (such as 30% of the total battery capacity, and at this time the output voltage of the rechargeable battery 51 is less than or equal to the set voltage value), it is considered that the rechargeable battery 51 cannot supply power externally at this time. When the power of the rechargeable battery 51 is greater than the lower limit threshold, it is considered that the rechargeable battery 51 can supply power externally at this time. And when the power of the rechargeable battery 51 reaches the full charge threshold (such as 90% of the total battery capacity, and at this time the output voltage of the rechargeable battery 51 reaches the full charge voltage value), it is considered that the rechargeable battery 51 is fully charged, that is, the charging is completed.

[0048] In actual implementation, the DC generator 30 provides a charging voltage between 12V and 36V to the rechargeable battery 51. In the same time, the power generation of the DC generator 30 and the capacity of the rechargeable battery 51 are much larger than the power consumption of the electrical equipment 200.

[0049] In actual implementation, when the processor 60 determines that the rechargeable battery 51 is fully charged through the battery power information, the processor 60 controls the charging circuit 52 to stop charging the rechargeable battery 51.

[0050] When the time that the rechargeable battery 51 is in a state where it cannot supply power externally exceeds the designed time, that is, when the rechargeable battery 51 is in a state where it cannot supply power externally for a long time due to reasons such as the long-term non-movement of the lifting hook 11, the processor 60 communicates wirelessly with the remote center through the communicator to notify relevant personnel (such as the tower crane operator) to come and drive the DC generator 30 to generate electricity by actively lifting the lifting hook 11 so that the rechargeable battery 51 is fully charged. Of course, in practice, in addition to coming to charge the rechargeable battery 51, relevant personnel can also replace the rechargeable battery 51 according to the actual situation.

[0051] The advantages of the present invention are:

[0052] 1. The present invention does not require any power cables to be arranged on the hook device. It can generate electricity by itself only using the kinetic energy generated by the steel wire rope connected to the hook device, without modifying the original structure of the hook device, and there is no problem of repeated disassembly and assembly. During the tower crane operation, it can continuously supply power to the electrical equipment installed on the hook device, and is not affected by factors such as the working conditions of the hook (such as being blocked by high-rise buildings) and the weather (such as continuous cloudy weather), improving construction safety.

[0053] 2. The present invention is easy to implement, has a low cost, and is not easily damaged (such as being damaged by collision), and is suitable for popularization.

[0054] 3. Through the design of the inertial sensor and the charging battery control logic, the present invention avoids the situation where the power generation voltage (or power) is insufficient to supply power due to the low-speed operation of the hook, and can automatically enable the power of the charging battery to supply power after sensing a large movement of the hook.

[0055] 4. The present invention is particularly suitable for supplying power to positioning devices (such as indicator lights, locators), ensuring the real-time feedback of the positioning device on the position of the hook during operation.

[0056] 5. When the present invention is used for a positioning device, as long as the positioning device is in a working state, the present invention can continuously supply power to the positioning device. And within the same time, the power generation of the DC generator is bound to be greater than the power consumption of the positioning device. Therefore, there is no problem of long-term power consumption when the positioning device is in a non-working state, which matches the positioning requirements when the hook is in a working state.

[0057] The above is the preferred embodiment of the present invention and the technical principles applied. For those skilled in the art, any obvious changes such as equivalent transformation and simple substitution based on the technical solution of the present invention without departing from the spirit and scope of the present invention shall fall within the protection scope of the present invention.

Claims

1. A self - generating power supply device for a tower crane hook device, the hook device comprising an assembly plate, a hook and a pulley block are installed on the assembly plate, a steel wire rope is wound around the pulley block, and the movement of the steel wire rope is controlled by a tower crane control device, characterized in that: The self - generating power supply device for tower crane hook equipment includes a friction wheel. The rolling surface of the friction wheel contacts the wire rope close to the assembly plate. The rotating shaft of the friction wheel is connected to the mechanical force input shaft of the DC generator. The friction wheel rotates under the friction of the wire rope during the movement of the wire rope, so as to drive the DC generator to generate electricity. Thus, the DC generator charges the rechargeable battery of the rechargeable battery assembly; the power output of the rechargeable battery is divided into two paths. One path directly supplies power to the processor and the inertial sensor, and the other path supplies power to the electrical equipment installed on the hook equipment via an electronic control switch; the inertial sensor installed on the hook equipment is connected to the processor, and the processor controls the opening and closing of the electronic control switch; the electrical equipment is a positioning device for calibrating the position of the hook. Among them: The power supply process of the self - generating power supply device for tower crane hook equipment includes the following steps: 1) When the friction wheel rotates under the friction of the moving wire rope, the rotation of the friction wheel drives the DC generator to generate electricity, so the DC generator charges the rechargeable battery; 2) The rechargeable battery supplies power to the processor and the inertial sensor; 3) The inertial sensor transmits the detected hook state information to the processor, and at the same time, the battery power monitoring circuit transmits the monitored battery power information to the processor; 4) The processor controls the opening and closing of the electronic control switch according to the received hook state information and battery power information. Among them: If the processor determines that the hook is in a moving state at this time through the hook state information, and determines that the rechargeable battery can supply power externally at this time through the battery power information, the processor controls the electronic control switch to open. Thus, the rechargeable battery supplies power to the electrical equipment, so that the electrical equipment is put into operation; If the processor determines that the hook transitions from a moving state to a non - moving state through the hook state information, and determines that the rechargeable battery can supply power externally at this time through the battery power information, the processor controls the electronic control switch to change from open to closed after a predetermined time delay. Thus, the rechargeable battery continues to supply power to the electrical equipment within the predetermined time, and the electrical equipment continues to operate within the predetermined time; If the processor determines that the hook remains in a non - moving state within the determination time through the hook state information, or the processor determines that the rechargeable battery cannot supply power externally at this time through the battery power information, the processor controls the electronic control switch to close. Thus, the rechargeable battery does not supply power to the electrical equipment, and the electrical equipment stops operating; 5) Return to 1).

2. The self - generating power supply device for tower crane hook equipment according to claim 1, characterized in that: The monitoring port of the battery power monitoring circuit is connected to the detection port of the rechargeable battery, and the signal transmission port of the battery power monitoring circuit is connected to the corresponding signal port of the processor.

3. The self - generating power supply device for tower crane hook equipment according to claim 1, characterized in that: On each side of the wire rope, there is a friction wheel. The two friction wheels are fixed to the assembly plate through the same support frame, and one of the two friction wheels is connected to the DC generator.

4. The self-powered power supply device for a tower crane hook device according to any one of claims 1 to 3, characterized in that: The charging battery assembly further includes a charging circuit. The charging circuit is connected between the power output port of the DC generator and the charging port of the charging battery, and the charging start / stop control port of the charging circuit is connected to the corresponding signal port of the processor.

5. The self-powered power supply device for a tower crane hook device according to any one of claims 1 to 3, characterized in that: The power output port of the charging battery is connected to the power supply ports of the processor, the inertial sensor, and the input port of the electric control switch via an output interface.

6. The self-powered power supply device for a tower crane hook device according to claim 1, characterized in that: The processor performs wireless communication with the remote center through a communicator.

7. The self-powered power supply device for a tower crane hook device according to claim 1, characterized in that: The positioning device is an indicator light or a locator.

8. A power supply method implemented by the self - generating power supply device for tower crane hook equipment according to claim 4, characterized in that, It includes the steps of: 1) When the friction wheel rotates under the frictional action of the moving wire rope, the rotation of the friction wheel drives the DC generator to generate electricity, and thus the DC generator charges the charging battery; 2) The charging battery supplies power to the processor and the inertial sensor; 3) The inertial sensor transmits the detected hook state information to the processor, and at the same time the battery power monitoring circuit transmits the monitored battery power information to the processor; 4) The processor controls the opening and closing of the electric control switch according to the received hook state information and battery power information, where: If the processor determines that the hook is in a moving state at this time through the hook state information and determines that the charging battery can supply power externally at this time through the battery power information, the processor controls the electric control switch to open, and thus the charging battery supplies power to the electrical equipment to enable the electrical equipment to operate; If the processor determines that the hook transitions from a moving state to a non-moving state through the hook state information and determines that the charging battery can supply power externally at this time through the battery power information, the processor controls the electric control switch to change from open to closed after a predetermined time delay, and thus the charging battery continues to supply power to the electrical equipment within the predetermined time, and the electrical equipment continues to operate within the predetermined time; If the processor determines that the hook remains in a non-moving state within the determination time through the hook state information, or the processor determines that the charging battery cannot supply power externally at this time through the battery power information, the processor controls the electric control switch to close, and thus the charging battery does not supply power to the electrical equipment, and the electrical equipment stops operating; 5) Return to 1).

9. The power supply method according to claim 8, characterized in that: When the processor determines that the rechargeable battery is fully charged based on the battery power information, the processor controls the charging circuit to stop charging the rechargeable battery.

10. The power supply method according to claim 8, wherein: When the time during which the rechargeable battery is in a state where it cannot supply power externally exceeds the designed time, the processor communicates wirelessly with a remote center through a communicator to notify relevant personnel to come and drive the DC generator to generate electricity by actively lifting the lifting hook so that the rechargeable battery is fully charged.

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