Power supply device, power supply method and new energy crane

Abstract

The invention relates to the field of engineering machinery, and discloses a power supply device and a power supply method.The power supply device is applied to a crane, the crane comprises an engine and arm head sensing equipment, and the power supply device comprises a battery assembly, a cable assembly and a control module; when the voltage of the battery assembly is smaller than the preset rated voltage, the control cable assembly supplies power to the battery assembly and the arm head sensing equipment; and when it is determined that the engine is in a shutdown state and the voltage of the battery assembly is larger than or equal to the preset rated voltage, the cable assembly is controlled to be disconnected to supply power to the battery assembly, and the battery assembly is controlled to supply power to the arm head sensing equipment. According to the power supply device, the problem that the crane needs to stop halfway due to the power supply problem of the arm head sensing equipment can be avoided, so that the crane can continuously work for a long time, and the working efficiency is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery, specifically relating to a power supply device, a power supply method, and a new energy crane. Background Technology

[0002] Current cranes, especially new energy cranes with hybrid power structures, typically have sensing devices at the boom head. These sensing devices include components such as radar, cameras, network switches, wireless communication devices, and high-performance computing devices, which are used to monitor the lifting operation and environmental conditions in real time and feed them back to the overall machine control system.

[0003] In existing technologies, batteries are usually installed at the top of the crane boom to power the sensing devices. However, due to limitations in installation space and safety requirements, the battery capacity is extremely limited. The batteries need to be removed frequently or the crane boom needs to be retracted and lowered for charging. As a result, the crane cannot operate continuously for long periods of time, which has a significant impact on work efficiency. Summary of the Invention

[0004] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a power supply device, a power supply method and a crane, aiming to solve the technical problem of low operating efficiency of cranes in the prior art.

[0005] To achieve the above objectives, the present invention provides a power supply device applied to a crane, the crane including a boom head sensing device, an engine, and a generator driven by the engine, the power supply device comprising:

[0006] A battery assembly for powering the arm-head sensing device;

[0007] A cable assembly for electrical connection to the generator and for powering the arm head sensing device, the cable assembly being electrically connected to the battery assembly to power the battery assembly;

[0008] The control module is configured as follows:

[0009] When it is determined that the engine is in operation and the voltage of the battery pack is less than the preset rated voltage, the cable assembly is controlled to supply power to the battery pack and the arm head sensing device.

[0010] When it is determined that the engine is in a stopped state and the voltage of the battery pack is greater than or equal to the preset rated voltage, the cable assembly is controlled to disconnect to supply power to the battery pack, and the battery pack is controlled to supply power to the arm head sensing device.

[0011] Optionally, the battery assembly includes a battery, a charging control switch, and a power supply control switch. The charging control switch is electrically connected to the charging terminal of the battery, and the power supply control switch is electrically connected to the power supply output terminal of the battery. The control module is signal-connected to the charging control switch and the power supply control switch, respectively.

[0012] The control of the cable assembly to power the battery assembly and the arm-head sensing device includes:

[0013] The charging control switch is turned on, and the power supply control switch is turned off.

[0014] The control of disconnecting the cable assembly to supply power to the battery assembly, and controlling the battery assembly to supply power to the arm-head sensing device, includes:

[0015] The charging control switch is turned off, and the power supply control switch is turned on.

[0016] Optionally, the control module is further configured to:

[0017] When it is determined that the engine is in operation and the voltage of the battery assembly is greater than or equal to the preset rated voltage, the cable assembly is controlled to prioritize power supply to the arm head sensing device.

[0018] Optionally, the cable assembly includes a boost module, a reel cable, and a buck regulator module that are connected sequentially along the current direction.

[0019] Optionally, the control module is further configured to:

[0020] In response to the device start signal, a control signal is generated and sent to control the various components in the arm head sensing device to turn on sequentially in a set order.

[0021] Optionally, the control module is further configured to:

[0022] In response to a component shutdown signal, a control signal is generated and emitted to control the shutdown of the corresponding component in the arm head sensing device;

[0023] In response to a component restart signal, a control signal is generated and sent to control the restart of the corresponding component in the arm head sensing device.

[0024] Optionally, the control module is further configured to:

[0025] The system acquires the operating current information of each component in the arm-head sensing device. When a fault is determined in the arm-head sensing device based on the operating current information of each component, a prompt signal indicating a fault in the arm-head sensing device is generated and issued.

[0026] The present invention also provides a power supply method applied to a crane, the crane including a boom head sensing device, an engine, a generator driven by the engine, and a power supply device. The power supply device includes a battery assembly and a cable assembly. The battery assembly is used to power the boom head sensing device, the cable assembly is used to be electrically connected to the generator and is capable of powering the boom head sensing device, and the cable assembly is electrically connected to the battery assembly to power the battery assembly. The power supply method includes:

[0027] When it is determined that the engine is in operation and the voltage of the battery pack is less than the preset rated voltage, the cable assembly is controlled to supply power to the battery pack and the arm head sensing device.

[0028] When it is determined that the engine is in a stopped state and the voltage of the battery pack is greater than or equal to the preset rated voltage, the cable assembly is controlled to disconnect to supply power to the battery pack, and the battery pack is controlled to supply power to the arm head sensing device.

[0029] Optionally, the battery assembly includes a battery, a charging control switch, and a power supply control switch, wherein the charging control switch is electrically connected to the charging terminal of the battery, and the power supply control switch is electrically connected to the power supply output terminal of the battery.

[0030] The control of the cable assembly to power the battery assembly and the arm-head sensing device includes:

[0031] The charging control switch is turned on, and the power supply control switch is turned off.

[0032] The control of disconnecting the cable assembly to supply power to the battery assembly, and controlling the battery assembly to supply power to the arm-head sensing device, includes:

[0033] The charging control switch is turned off, and the power supply control switch is turned on.

[0034] Optionally, the power supply method further includes:

[0035] When it is determined that the engine is in operation, the cable assembly is controlled to supply power to the arm head sensing device;

[0036] When it is determined that the engine is in a stopped state and the voltage of the battery pack is greater than or equal to the preset rated voltage, the battery pack is controlled to supply power to the arm head sensing device.

[0037] The present invention also provides a new energy crane, including the power supply device described above.

[0038] The power supply device, as described above, includes a battery assembly and a cable assembly. The battery assembly can be installed on the boom of the crane to power the boom-head sensing device. The cable assembly can be electrically connected to the crane's generator, transmitting the electrical energy generated by the generator to both the boom-head sensing device and the battery assembly. This enables the power supply to the boom-head sensing device and the charging of the battery assembly. Under the control of the control module, when the engine is running and the battery assembly voltage is less than the preset rated voltage, the cable assembly powers the boom-head sensing device while simultaneously charging the battery assembly. When the engine is off and the battery assembly voltage is greater than or equal to the preset rated voltage, the battery assembly powers the boom-head sensing device. This configuration, where the cable assembly and battery assembly work together to power the boom-head sensing device, provides a stable power supply for a long period, preventing the crane from having to stop mid-operation due to power supply issues with the boom-head sensing device. This allows the crane to operate continuously for longer periods, significantly improving work efficiency. Furthermore, the battery assembly can automatically charge when the engine starts, eliminating the need to remove it or retract the boom for charging, thus avoiding complex and cumbersome manual operations.

[0039] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0040] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed embodiments to explain the invention, but do not constitute a limitation thereof.

[0041] In the attached diagram:

[0042] Figure 1 This is a schematic diagram of the power supply device in one embodiment of the present invention;

[0043] Figure 2 This is a flowchart of a power supply method in one embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1 Battery Components

[0046] 11 Battery 12 Charging control switch

[0047] 13 Power supply control switch

[0048] 2 Cable Assembly

[0049] 21. Boost module 22. Cable reel

[0050] 23. Step-down and voltage-regulating module

[0051] 3 Control Module

[0052] 4 Power supply selection module Detailed Implementation

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0055] In this invention, unless otherwise stated, directional terms such as "center," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this invention. The directional terms "inner" and "outer" refer to the inside and outside of the outline of each component itself.

[0056] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0057] The present invention first provides a power supply device, as shown in the attached drawing. Figure 1 As shown, this is applied to a crane, which includes a boom sensing device, an engine, and a generator driven by the engine. The power supply device includes:

[0058] Battery assembly 1 is used to power the arm-head sensing device;

[0059] Cable assembly 2 is used for electrical connection with the generator and is able to power the arm head sensing device. Cable assembly 2 is also electrically connected to battery assembly 1 so as to power battery assembly 1.

[0060] Control module 3 is configured as follows:

[0061] When the engine is confirmed to be running and the voltage of battery assembly 1 is less than the preset rated voltage, control cable assembly 2 supplies power to battery assembly 1 and arm head sensing device.

[0062] When the engine is determined to be in a stopped state and the voltage of battery assembly 1 is greater than or equal to the preset rated voltage, the control cable assembly 2 is disconnected to supply power to battery assembly 1, and the battery assembly 1 is controlled to supply power to the arm head sensing device.

[0063] In practical applications, battery assembly 1 can be installed on the boom of the crane to power the boom-head sensing device. Cable assembly 2 can be electrically connected to the crane's generator and transmit the electrical energy generated by the generator to the boom-head sensing device and battery assembly 1, thus powering the boom-head sensing device and charging battery assembly 1. Under the control of control module 3, when the engine is running and the voltage of battery assembly 1 is less than the preset rated voltage, cable assembly 2 powers the boom-head sensing device and charges battery assembly 1 simultaneously. When the engine is off and the voltage of battery assembly 1 is greater than or equal to the preset rated voltage, battery assembly 1 powers the boom-head sensing device. This configuration, where cable assembly 2 and battery assembly 1 work together to power the boom-head sensing device, provides a stable power supply for a long time, avoiding the need for the crane to stop midway due to power supply issues with the boom-head sensing device. This allows the crane to operate continuously for longer periods, significantly improving work efficiency. In addition, battery assembly 1 can automatically charge when the engine starts, without needing to be removed or the boom retracted for charging, avoiding complex and cumbersome manual operations.

[0064] In practical applications, control module 3 can receive engine speed information and thus determine whether the engine is running or stopped. For example, control module 3 can communicate with the crane's CAN bus to obtain engine speed information, or it can communicate with sensors installed on the engine to obtain engine speed information.

[0065] Specifically, when the engine is running and the voltage of battery assembly 1 is greater than or equal to the preset rated voltage, both cable assembly 2 and battery assembly 1 can power the arm head sensing device. Generally, cable assembly 2 is selected to provide power first. Therefore, in some embodiments, control module 3 is also configured to:

[0066] When the engine is confirmed to be running, the control cable assembly 2 supplies power to the arm head sensing device.

[0067] In one embodiment, reference is made to the appendix. Figure 1 As shown, the battery assembly 1 includes a battery 11, a charging control switch 12, and a power supply control switch 13. The charging control switch 12 is electrically connected to the charging terminal of the battery 11, and the power supply control switch 13 is electrically connected to the power supply output terminal of the battery 11. The control module 3 is signal connected to the charging control switch 12 and the power supply control switch 13 respectively.

[0068] The control cable assembly 2 supplies power to the battery assembly 1 and the arm head sensing device, including:

[0069] The charging control switch 12 is turned on, and the power supply control switch 13 is turned off.

[0070] Disconnecting the control cable assembly 2 to power the battery assembly 1, and controlling the battery assembly 1 to power the arm head sensing device, includes:

[0071] The charging control switch 12 is turned off, and the power supply control switch 13 is turned on.

[0072] Understandably, the charging end of battery 11 is electrically connected to cable assembly 2 for charging, and the power output end of battery 11 is electrically connected to the arm head sensing device for powering the arm head sensing device. By controlling the charging control switch 12 to be turned on and the power supply control switch 13 to be turned off, the cable assembly 2 can be controlled to supply power to battery assembly 1 and disconnect the power output of battery assembly 1. By controlling the charging control switch 12 to be turned off and the power supply control switch 13 to be turned on, the cable assembly 2 can be controlled to disconnect the power supply to battery 11, and at the same time, the battery 11 can output power to power the arm head sensing device.

[0073] Specifically, the battery 11 includes a battery pack and a charging module. The input terminal of the charging module is the charging terminal of the battery 11, and the output terminal of the battery pack is the power supply output terminal of the battery 11.

[0074] Specifically, both the charging control switch 12 and the power supply control switch 13 can be relays. In practical applications, in order to ensure the reliability of the opening and closing of the charging control switch 12 and the power supply control switch 13, the charging control switch 12 and the power supply control switch 13 can be powered by the crane's battery.

[0075] In one embodiment, the control module 3 is further configured to:

[0076] When the engine is confirmed to be running and the voltage of battery assembly 1 is greater than or equal to the preset rated voltage, control cable assembly 2 prioritizes power supply to the arm head sensing device.

[0077] Specifically, the power supply device may further include a power selection module 4, which has a first input terminal, a second input terminal, and an output terminal for electrical connection with the arm head sensing device. The output terminal is selectively connected to either the first input terminal or the second input terminal. The output terminal of the cable assembly 2 is electrically connected to the first input terminal of the power selection module 4. The power output terminal of the battery assembly 1 is electrically connected to the second input terminal of the power selection module 4. The control module 3 is signal-connected to the power selection module 4 and is further configured as follows:

[0078] When the engine is determined to be running, the first input terminal and the output terminal of the power supply selection module 4 are connected. When the engine is determined to be stopped and the voltage of the battery pack 1 is greater than or equal to the preset rated voltage, the second input terminal and the output terminal of the power supply selection module 4 are connected.

[0079] In this way, the cable assembly 2 and battery assembly 1 can work together to automate the power supply to the arm head sensing device.

[0080] In one embodiment, reference is made to the appendix. Figure 1 As shown, the cable assembly 2 includes a boost module 21, a reel cable 22, and a buck regulator module 23 that are connected in sequence along the current direction.

[0081] Specifically, the boost module 21 is used to connect electrically to the generator, the buck regulator module 23 is used to connect electrically to the battery assembly 11 and the boom sensing device, and the reel cable 22 is externally mounted on the outside of the boom. Thus, the current generated by the generator is supplied to the battery assembly 11 or the boom sensing device after passing through the boost module 21, the reel cable 22 and the buck regulator module 23 in sequence. The boost module 21 plays a boosting role, which can effectively reduce the loss of electrical energy during the transmission of the reel cable 22, while the buck regulator module 23 plays a buck stabilizing role, so that the output voltage of the cable assembly 2 is stable, ensuring the stable operation of the boom sensing device and avoiding the failure of the boom sensing device due to excessive voltage fluctuations.

[0082] In practical applications, the boosting module 21 can be installed on the chassis of the crane, and the step-down and voltage stabilizing module 23 can be installed on the boom head of the crane arm.

[0083] In one embodiment, the control module 3 is further configured to:

[0084] In response to the device start signal, control signals are generated and sent to control the sequential activation of each component in the control arm head sensing device in a set order.

[0085] In this way, the control module 3 controls each component in the arm-head sensing device to turn on in a set order. This setting can avoid the situation where the instantaneous power is too high due to the simultaneous turn-on of each component in the arm-head sensing device, and ensure the normal start-up of each component in the arm-head sensing device.

[0086] In practical applications, the control module 3 can be connected to the crane's upper controller and boom head sensing device respectively to receive the device start signal sent by the upper controller and send the generated control signal to the boom head sensing device.

[0087] In one embodiment, the control module 3 is further configured to:

[0088] In response to a component shutdown signal, a control signal is generated and sent to shut down the corresponding component in the control arm head sensing device;

[0089] In response to a component restart signal, a control signal is generated and sent to restart the corresponding component in the control arm head sensing device.

[0090] In this way, by controlling the shutdown and restart of specified components in the arm-head sensing device through the control module 3, it is easier to troubleshoot the arm-head sensing device.

[0091] In practical applications, the control module 3 can be connected to the crane's upper controller and boom head sensing device respectively to receive the component shutdown signal and component restart signal issued by the upper controller, and send the generated control signal to the boom head sensing device.

[0092] In one embodiment, the control module 3 is further configured to:

[0093] The system acquires the operating current information of each component in the arm-head sensing device. When a fault is detected in the arm-head sensing device based on the operating current information of each component, a prompt signal indicating the fault is generated and issued.

[0094] In this way, even if the control module 3 has a diagnostic function, it can provide timely feedback when the arm head sensing device malfunctions, so that the operator can record it for troubleshooting and maintenance.

[0095] In practical applications, control module 3 can be connected to the crane's upper controller, boom head sensing device, and crane's cab display device respectively. When a fault is detected in the boom head sensing device, the generated prompt signal can be sent to the upper controller and the cab display device, thereby prompting the operator to detect the abnormality of the boom head sensing device and take corresponding control measures.

[0096] In one embodiment, the control module 3 is signal-connected to the battery component 11. The control module 3 acquires the power information of the battery component 11 in real time and feeds it back to the display device in the crane's cab, so that the operator can know the power status of the battery component 11 at any time.

[0097] The present invention also provides a power supply method applied to a crane. The crane includes a boom-head sensing device, an engine, a generator driven by the engine, and a power supply device. The power supply device includes a battery assembly 1 and a cable assembly 2. The battery assembly 1 supplies power to the boom-head sensing device, and the cable assembly 2 is electrically connected to the generator and can supply power to the boom-head sensing device. The cable assembly 2 is electrically connected to the battery assembly 1 to supply power to the battery assembly 1. (See attached figure.) Figure 2 As shown, the power supply methods include:

[0098] Obtain engine speed information and battery component 1 voltage information;

[0099] When the engine is confirmed to be running and the voltage of battery assembly 1 is less than the preset rated voltage, control cable assembly 2 supplies power to battery assembly 1 and arm head sensing device.

[0100] When the engine is determined to be in a stopped state and the voltage of battery assembly 1 is greater than or equal to the preset rated voltage, the control cable assembly 2 is disconnected to supply power to battery assembly 1, and the battery assembly 1 is controlled to supply power to the arm head sensing device.

[0101] Specifically, the engine's operating status can be determined by obtaining the engine's speed information.

[0102] In one embodiment, the battery assembly 1 includes a battery 11, a charging control switch 12, and a power supply control switch 13. The charging control switch 12 is electrically connected to the charging terminal of the battery 11, and the power supply control switch 13 is electrically connected to the power supply output terminal of the battery 11.

[0103] Control cable assembly 2 supplies power to battery assembly 1 and arm head sensing device, including:

[0104] The charging control switch 12 is turned on, and the power supply control switch 13 is turned off.

[0105] The control cable assembly 2 disconnects to supply power to the battery assembly 1, and controls the battery assembly 1 to supply power to the arm head sensing device, including:

[0106] The charging control switch 12 is turned off, and the power supply control switch 13 is turned on.

[0107] In one embodiment, the power supply method further includes:

[0108] When it is determined that the engine is in operation and the voltage of the battery assembly 1 is greater than or equal to the preset rated voltage, the cable assembly 2 is controlled to prioritize power supply to the arm head sensing device.

[0109] The present invention also provides a new energy crane, including the power supply device described above.

[0110] Obviously, new energy cranes also have the beneficial effects of the aforementioned power supply devices, which will not be elaborated here.

[0111] Specifically, the new energy crane is a new energy crane with a hybrid power architecture.

[0112] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0113] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power supply device, characterized in that: Applied to a crane, the crane comprises a boom sensing device, an engine and a generator driven by the engine, and the power supply device comprises: A battery assembly (1), used to supply power to the arm head sensing device; A cable assembly (2) is used to be electrically connected to the generator and capable of supplying power to the arm head sensing device, and the cable assembly (2) is electrically connected to the battery assembly (1) so as to be capable of supplying power to the battery assembly (1); The control module (3) is configured to: When it is determined that the engine is in a running state and the voltage of the battery assembly (1) is less than a preset rated voltage, the cable assembly (2) is controlled to supply power to the battery assembly (1) and the arm head sensing device; When it is determined that the engine is in a stopped state and the voltage of the battery assembly (1) is greater than or equal to the preset rated voltage, the cable assembly (2) is controlled to disconnect the power supply to the battery assembly (1), and the battery assembly (1) is controlled to supply power to the arm head sensing device.

2. The power supply device according to claim 1, characterized in that: The battery assembly (1) comprises a battery (11), a charging control switch (12) and a power supply control switch (13); the charging control switch (12) is electrically connected to a charging end of the battery (11); the power supply control switch (13) is electrically connected to a power supply output end of the battery (11); and the control module (3) is signal-connected to the charging control switch (12) and the power supply control switch (13) respectively; The controlling the cable assembly (2) to supply power to the battery assembly (1) and the arm head sensing device comprises: Controlling the charging control switch (12) to be turned on, and controlling the power supply control switch (13) to be turned off; The controlling the cable assembly (2) to disconnect the power supply to the battery assembly (1), and controlling the battery assembly (1) to supply power to the arm head sensing device comprises: The charging control switch (12) is controlled to be disconnected, and the power supply control switch (13) is controlled to be turned on.

3. The power supply device according to claim 1, characterized in that: The control module (3) is further configured to: When it is determined that the engine is in a running state and the voltage of the battery assembly (1) is greater than or equal to the preset rated voltage, the cable assembly (2) is controlled to preferentially supply power to the arm head sensing device.

4. The power supply device according to claim 1, characterized in that: The cable assembly (2) comprises a voltage-boosting module (21), a reel cable (22), and a voltage-stepping and voltage-stabilizing module (23) which are electrically connected in sequence along a current direction.

5. The power supply device according to claim 1, characterized in that: The control module (3) is further configured to: In response to the device start-up signal, a control signal is generated and sent to control each element in the arm head sensing device to start in sequence according to a set order.

6. The power supply device according to claim 1, characterized in that: The control module (3) is further configured to: In response to the element closing signal, generating and sending a control signal for controlling the closing of the corresponding element in the arm head sensing device; In response to the element restart signal, a control signal for controlling the restart of the corresponding element in the arm head sensing device is generated and issued.

7. The power supply device according to claim 1, characterized in that: The control module (3) is further configured to: The working current information of each component in the arm head sensing device is obtained, and when it is determined that the arm head sensing device is faulty according to the working current information of each component, a prompt signal indicating the fault of the arm head sensing device is generated and issued.

8. A power supply method, characterized in that: Applied to a crane, the crane comprises a boom head sensing device, an engine, a generator driven by the engine, and a power supply device, the power supply device comprises a battery assembly (1) and a cable assembly (2), the battery assembly (1) is used to supply power to the boom head sensing device, the cable assembly (2) is used to be electrically connected to the generator and can supply power to the boom head sensing device, and the cable assembly (2) is electrically connected to the battery assembly (1) so as to be able to supply power to the battery assembly (1); The power supply method comprises: When it is determined that the engine is in a running state and the voltage of the battery assembly (1) is less than a preset rated voltage, the cable assembly (2) is controlled to supply power to the battery assembly (1) and the arm head sensing device; When it is determined that the engine is in a stopped state and the voltage of the battery assembly (1) is greater than or equal to the preset rated voltage, the cable assembly (2) is controlled to disconnect the power supply to the battery assembly (1), and the battery assembly (1) is controlled to supply power to the arm head sensing device.

9. The power supply method according to claim 8, characterized in that: The battery assembly (1) comprises a battery (11), a charging control switch (12) and a power supply control switch (13), wherein the charging control switch (12) is electrically connected to a charging end of the battery (11), and the power supply control switch (13) is electrically connected to a power supply output end of the battery (11); The controlling the cable assembly (2) to supply power to the battery assembly (1) and the arm head sensing device comprises: Controlling the charging control switch (12) to be turned on, and controlling the power supply control switch (13) to be turned off; The controlling the cable assembly (2) to disconnect the power supply to the battery assembly (1), and controlling the battery assembly (1) to supply power to the arm head sensing device, comprises: The charging control switch (12) is controlled to be disconnected, and the power supply control switch (13) is controlled to be turned on.

10. The power supply method according to claim 8, characterized in that: The power supply method further comprises: When it is determined that the engine is in a running state and the voltage of the battery assembly (1) is greater than or equal to the preset rated voltage, the cable assembly (2) is controlled to preferentially supply power to the arm head sensing device.

11. A new energy crane, characterized in that: The invention comprises a power supply device according to any one of claims 1 to 7.

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