Pure electric control device of crawler crane and control method of pure electric control device

Abstract

The invention discloses a pure electric control device of a crawler crane and a control method thereof, the pure electric control device comprises a battery system, a TMS constant temperature system, an integration unit, a dual-mode charging interface, a control unit, a comprehensive cooling system and a power execution mechanism, the battery system comprises a battery and an integrated BMS battery management module; the integration unit supports multi-machine parallel connection and intelligent power distribution, the control unit is automatically switched to any one of five operation modes according to the mains supply connection state, the battery electric quantity and the load requirement, and the comprehensive cooling system monitors the temperature of the motor, the hydraulic system and the integration unit in real time through a temperature sensor. The integration unit supports OBC multi-machine parallel connection and PDU power dynamic distribution, the TMS system achieves-35 DEG C to 65 DEG C full temperature range protection, the control unit predicts the switching opportunity based on real-time data, the energy utilization rate is greatly improved, energy consumption and pollution are reduced, installation and maintenance are facilitated through integrated design, manual intervention is reduced through intelligent control, energy recovery is supported, and economical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric engineering machinery, and in particular to a pure electric control device of a crawler crane and a control method thereof. Background Art

[0002] In the current environment of increasing fuel costs and stricter environmental protection laws and regulations, pure electric construction machinery can reduce fuel consumption, reduce pollution emissions, and protect the environment. Powered by battery systems or mains electricity, it can also greatly reduce noise pollution, which is in line with the upcoming new energy trend. Existing crawler cranes are mostly fuel crawler cranes, which have the problems of high fuel consumption costs, high pollution, and extremely loud noise when working.

[0003] Existing pure electric control systems lack intelligent multi-mode switching and energy management capabilities, making them difficult to adapt to complex operating conditions. Current fuel-powered crawler cranes face three major pain points: ① Diesel consumption accounts for over 45% of operating costs; ② NOx emissions exceed standards; and ③ Operating noise exceeds 85dB. While attempts at electrification exist, common issues include the inability to simultaneously charge and operate, battery performance plummets in low-temperature environments, and energy recovery efficiency below 15%.

[0004] The present invention integrates multiple modules and control units. The control unit is the core of the control device. All functions are adjusted based on the information reading, processing, judgment and signal return of the control unit, so that the motor works in the optimal state, maximizes the use of clean energy while ensuring efficiency, reduces fuel emission pollution, and improves economy. The control unit is connected to the control screen through a CAN line, which is fast and stable, and can display the current status of each part in real time, making it convenient for the driver to better grasp vehicle information. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pure electric control device and a control method thereof which can realize intelligent switching among five working modes, is efficient, environmentally friendly, intelligent, and suitable for crawler cranes in various complex working conditions.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] A pure electric control device for a crawler crane, comprising: a battery system, a TMS constant temperature system, an integration unit, a dual-mode charging interface, a control unit, an integrated cooling system, and a power actuator. The battery system comprises a battery and a BMS battery management module integrated on the battery. The battery system has a capacity of ≥200.54 kWh and a charge and discharge rate of ≥0.6C. The TMS constant temperature system maintains the operating temperature of the battery system within a range of -35°C to 65°C. The integration unit comprises an OBC module, a PDU module, an AC-DC module, and a DC-DC module. The integration unit supports multi-machine parallel connection and intelligent power distribution. The dual-mode charging interface includes a mains connection interface. , DC charging port, the AC power connection interface is arranged on the side of the body and adjacent to the track, the AC power connection interface is connected to the integration unit through a central rotary joint, the DC charging port is connected to the battery system through the central rotary joint, the control unit is connected to each component through the CAN bus and obtains operation data in real time, the control unit automatically switches to any one of the towing operation mode, operation charging mode, battery operation mode, AC power charging mode and DC charging mode according to the AC power connection status, battery power and load demand, the power actuator includes a motor and a hydraulic system, and the integrated cooling system monitors the temperature of the motor, hydraulic system and integration unit in real time through a temperature sensor.

[0008] In the above structure, when the AC power connection interface is connected and meets the safety standards, the control unit starts the towing operation mode, and the AC power drives the motor through the integration unit. In the towing operation mode, if the battery power is lower than the threshold and the AC power is redundant, the operation charging mode is synchronously started to charge the battery. When the AC power is not connected and the battery power meets the working conditions, the control unit starts the battery operation mode, and the battery drives the motor through the integration unit. When the equipment is shut down and the AC power is connected, the AC charging mode is started to charge the battery. When the DC charging port is connected to a power source, the control unit starts the DC charging mode to directly charge the battery.

[0009] In the above structure, in the operating charging mode or the AC charging mode, the control unit monitors the battery SOC status in real time. When the SOC reaches 100%, it automatically cuts off the charging circuit and maintains the towing operation mode, generates an overcharge protection log and transmits it to the control panel through the CAN bus.

[0010] In the above structure, the OBC module supports a multi-machine parallel topology. Based on the master-slave automatic allocation mechanism of the CAN communication, the PDU module dynamically adjusts the output power of each machine according to the load demand to ensure that the charging and discharging efficiency is maximized.

[0011] In the above structure, the TMS constant temperature system includes a distributed temperature sensor network, a bidirectional PTC heating / liquid cooling circulation module, and a temperature difference compensation algorithm activated under extreme working conditions.

[0012] In the above structure, the AC power connection interface is provided with a connection status detection circuit, an overvoltage / undervoltage protection relay, and a quick plug-in mechanism. The waterproof grade of the quick plug-in mechanism is IP68. The AC power connection interface can be connected to the AC power for towing operations or charge the battery system through the integrated unit and tow operations or charge the battery system separately.

[0013] In the above structure, the battery system adopts a modular independent unit design, and realizes self-diagnosis and fault feedback through the BMS battery management module. The battery system supports the CAN bus communication, is compatible with multiple voltage platforms, and is equipped with a quick-release interface for easy replacement and maintenance.

[0014] In the above structure, the motor is a permanent magnet synchronous motor, which is converted into a generator mode when the heavy object is lowered, and reversely charges the battery system. The constant torque output range of the motor covers the speed range of 0-3000rpm, and the energy recovery efficiency of the motor is ≥23%.

[0015] In the above structure, the integrated cooling system includes: a three-channel independent cooling circuit, a control module for a variable frequency fan based on temperature gradient prediction, and a dynamic cooling power allocation algorithm. The three-channel independent cooling circuit integrates a hydraulic system, an integration unit, and a motor cooling channel.

[0016] The control method of the pure electric control device of the crawler crane specifically comprises the following steps:

[0017] S1: Detect the mains connection status and the battery SOC when power is turned on, and display them on the control screen;

[0018] S2: During operation, the battery power level is compared with the working requirement threshold in real time, and the working mode is selected and automatically switched to any one of the working modes, namely, the towing operation mode, the working charging mode, the battery operation mode, the mains charging mode, and the DC charging mode, according to the working condition requirements;

[0019] S3: Real-time monitoring of temperature, power and SOC parameters during operation;

[0020] S4: Dynamically switch the working mode based on a multi-objective optimization algorithm;

[0021] S5: When charging is completed, the charging protection mechanism is automatically activated until charging is completed, power-off protection is automatically executed, and an operation report is generated.

[0022] The beneficial effects of the present invention are:

[0023] This invention enables automated intelligent control. While the equipment is operating, the control unit flexibly switches between different modes based on operating conditions and equipment availability, improving control accuracy while ensuring optimal efficiency. After the equipment completes its operation, when the vehicle enters either mains or DC charging mode, the control unit protects the battery system from charging errors. This fully automated and intelligent charging process requires no human oversight. The charging protection function disconnects the battery system immediately when fully charged, preventing overcharging and energy waste. It also enables intelligent switching between five operating modes to accommodate complex operating conditions. The integrated unit supports parallel operation of multiple OBC units and dynamic power allocation for PDUs. The TMS system provides full temperature protection from -35°C to 65°C. The control unit predicts switching timing based on real-time data. The permanent magnet motor supports over 23% energy recovery, addressing the high pollution and noise levels associated with traditional fuel-powered cranes and improving energy efficiency by 30%. This invention offers efficient energy management, reduces energy consumption and pollution, and features an integrated design for easy installation and maintenance. Its intelligent control reduces manual intervention, supports energy recovery, and improves economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural block diagram of an embodiment of a pure electric control device and a control method for a crawler crane according to the present invention;

[0025] Figure 2 This is one of the structural schematic diagrams of the crawler crane body in the embodiment of the pure electric control device and control method thereof of the present invention;

[0026] Figure 3 In the embodiment of the pure electric control device and control method of the crawler crane of the present invention Figure 2 Schematic diagram of the local structure;

[0027] Figure 4 This is the second structural schematic diagram of the machine body in the embodiment of the pure electric control device and control method of the crawler crane of the present invention.

[0028] In the figure, 1-battery system, 2-MS constant temperature system, 3-integration unit, 4-control unit, 5-integrated cooling system, 6-mains connection interface, 7-DC charging port, 8-machine body, 9-motor, 10-hydraulic pump. DETAILED DESCRIPTION

[0029] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0030] like Figure 1-4As shown, a pure electric control device for a crawler crane includes: a battery system 1, a TMS constant temperature system 2, an integration unit 3, a dual-mode charging interface, a control unit 4, an integrated cooling system 5 and a power actuator. The battery system 1 includes a battery and a BMS battery management module integrated on the battery. The capacity of the battery system 1 is ≥200.54kWh, and the charge and discharge rate is ≥0.6C. The TMS constant temperature system 2 maintains the operating temperature of the battery system 1 in the range of -35°C to 65°C. The integration unit 3 includes an OBC module, a PDU module, an AC-DC module and a DC-DC module. The integration unit 3 supports multi-machine parallel connection and intelligent power distribution. The dual-mode charging interface includes a mains power supply. Connection interface 6, DC charging port 7, the AC power connection interface 6 is set on the side of the body 8 and adjacent to the track, the AC power connection interface 6 is connected to the integration unit 4 through the central rotary joint, the DC charging port 7 is connected to the battery system 1 through the central rotary joint, the control unit 4 is connected to each component through the CAN bus and obtains operating data in real time, the control unit 4 automatically switches to any one of the towing operation mode, operation charging mode, battery operation mode, AC power charging mode, and DC charging mode according to the AC power connection status, battery power and load demand, the power actuator includes a motor 9 and a hydraulic system, and the integrated cooling system 5 monitors the temperature of the motor 9, the hydraulic system, and the integration unit 3 in real time through a temperature sensor.

[0031] Specifically, in this embodiment, when the mains connection interface 6 is connected to the mains, the mains is used to power the motor 9 for operation, that is, the towing operation mode; in the towing operation mode, the mains can be used to power the motor 9 for operation while charging the battery system 1 through the integration unit 3, that is, the operation charging mode; when the mains connection interface 6 is not connected to the mains, the battery system 1 is used to power the motor 9 for operation through the integration unit 3, that is, the battery operation mode; when no operation is performed, the mains connection interface 6 can be used to connect the mains to charge the battery system 1 through the integration unit 3, that is, the mains charging mode; the DC charging port can also be used to directly charge the battery system 1, that is, the DC charging mode.

[0032] Specifically, in this embodiment, the hydraulic system includes a hydraulic pump 10 and related pipelines and control devices. The hydraulic pump 10 is an execution end and is used for various operations.

[0033] Specifically, in this embodiment, the control unit intelligently switches between five operating modes: towing mode, operating charging mode, battery mode, mains charging mode, and DC charging mode. In battery mode, the control unit 4 calculates the remaining operating time T in real time: (current SOC minus safety threshold) / instantaneous power consumption. If T is less than 15 minutes, a mains connection warning is issued via the control panel. If mains power is not connected, the hydraulic pump output power is reduced in stages until the system shuts down.

[0034] Specifically, in this embodiment, the integration unit integrates the OBC on-board charger, the PDU power distribution unit, the AC-DC rectifier module and the DC-DC conversion module.

[0035] Specifically, in this embodiment, energy efficiency is maximized: the operational charging mode reduces charging downtime by 40%, full operating adaptability: the TMS system expands the applicable area of ​​the equipment to cold / tropical zones, and intelligent safety protection: the dual-stage overcharge protection mechanism extends the battery life cycle by more than 2,000 times.

[0036] In a preferred embodiment of the present invention, when the mains connection interface 6 is connected and meets safety standards, the control unit 4 starts the towing operation mode, and the mains drives the motor 9 through the integration unit 3. In the towing operation mode, if the battery power is lower than the threshold and the mains power is redundant, the operation charging mode is started synchronously to charge the battery. When the mains is not connected and the battery power meets the working conditions, the control unit 4 starts the battery operation mode, and the battery drives the motor 9 through the integration unit 3. When the equipment is shut down and the mains is connected, the mains charging mode is started to charge the battery. When the DC charging port 7 is connected to the power supply, the control unit 4 starts the DC charging mode to directly charge the battery.

[0037] Specifically, in this embodiment, the integration unit 3 is an integrated unit cabinet that integrates the OBC vehicle charging system, the PDU power distribution unit, the AC-DC rectifier module and the DC-DC conversion module.

[0038] Specifically, in this embodiment, the OBC can select an OBC multi-machine parallel scheme based on the remaining power of the battery system 1 and the size of the load demand, and automatically allocate the master and slave machines through CAN communication without making physical distinctions. The PDU can intelligently allocate the output power of each machine to ensure that the charging and discharging efficiency is maximized.

[0039] Specifically, in this embodiment, the DC charging port 7 can be directly connected to a DC power source to directly charge the battery system 1 and has functions such as communication diagnosis and connection detection. DC charging has the advantages of high power and fast charging, which can reduce the charging waiting time. It is suitable for urgent use and inconvenient towing operations and other working conditions. The DC charging port 7 is connected to the on-board battery system 1 through a central rotary joint for charging.

[0040] Specifically, in this embodiment, the control unit 4 obtains all information such as the status of the DC charging port 7 and the mains connection interface 6, the power information of the battery system 1, the working status of the integration unit 3, the current required power and actual power of the motor 9, etc. After obtaining the information, it performs intelligent judgment processing, calculates the data and selects the optimal solution after considering all situations, and returns the result to each part in the form of a control signal. The vehicle is controlled by the signal to make adjustments so as to automatically and flexibly select and switch the working state. The control unit 4 is the core part of the pure electric control device of the electric crawler crane.

[0041] In a preferred embodiment of the present invention, in the operating charging mode or the AC charging mode, the control unit 4 monitors the 4 battery SOC status in real time. When the SOC reaches 100%, it automatically cuts off the charging circuit and maintains the 4 towing operation mode, generates an overcharge protection log and transmits it to the control screen through the 4CAN bus.

[0042] In a preferred embodiment of the present invention, the OBC module supports a multi-machine parallel topology. Based on the master-slave automatic allocation mechanism of the CAN communication, the PDU module dynamically adjusts the output power of each machine according to the load demand to ensure that the charging and discharging efficiency is maximized.

[0043] Specifically, in this embodiment, the OBC module supports parallel operation of multiple machines, automatically assigns master and slave roles through CAN communication, and the PDU module intelligently allocates output power according to load demand to maximize charging and discharging efficiency.

[0044] In a preferred embodiment of the present invention, the TMS constant temperature system 2 includes a distributed temperature sensor network, a bidirectional PTC heating / liquid cooling circulation module, and a temperature difference compensation algorithm activated under extreme working conditions.

[0045] Specifically, in this embodiment, the ambient storage temperature of the battery system 1 is -35°C to 65°C. When stored for a long time, the ambient temperature should be controlled below 35°C, the operating temperature of the battery system 1 should be controlled between -35°C and 65°C, and the charging temperature should be controlled between 0°C and 65°C. However, when the vehicle enters extreme weather conditions, the temperature does not meet the requirements. At this time, the TMS constant temperature system 2 will protect the battery and maintain the battery temperature at the required temperature.

[0046] In a preferred embodiment of the present invention, the AC power connection interface 6 is provided with a connection status detection circuit, an overvoltage / undervoltage protection relay, and a quick plug-in mechanism. The waterproof grade of the quick plug-in mechanism is IP68. The AC power connection interface 6 can be connected to the AC power for towing operations or charge the battery system 1 through the integration unit 3 and tow operations or charge the battery system 1 alone.

[0047] Specifically, in this embodiment, the AC power connection interface 6 can be connected to the AC power for towing operations or charge the battery system 1 through the integration unit 3 and tow operations or charge the battery system 1 alone. At the same time, the interface also has connection detection, safety protection and other functions. In order to facilitate the vehicle to perform operations such as rotation and walking, the AC power connection interface 6 is set at the lower track and is connected to the upper integration unit 3 through the central rotary joint, so that it can better adapt to smaller terrain during towing operations and perform complex movements.

[0048] In a preferred embodiment of the present invention, the battery system 1 adopts a modular independent unit design, and realizes self-diagnosis and fault feedback through the BMS battery management module. The battery system 1 supports CAN bus communication, is compatible with multiple voltage platforms, and is equipped with a quick-release interface for easy replacement and maintenance.

[0049] Specifically, in this embodiment, the BMS system (battery management system) in the battery system 1 has a capacity of 200.54Kwh, and the charging and discharging rate reaches 0.6c, which fully meets the vehicle's working time of 4-8 hours in battery operation mode. The battery system 1 is an independent module, adopts CANBUS communication connection, and is equipped with a BMS (battery management system), which is convenient for system management, self-diagnosis and fault feedback, etc. At the same time, it can adapt to various types of voltage platforms, and is convenient for use with other components such as the integration unit 3 and the motor 9.

[0050] In a preferred embodiment of the present invention, the motor 9 is a permanent magnet synchronous motor. The motor 9 is converted into a generator mode during the heavy object lowering operation to reversely charge the battery system 1. The constant torque output range of the motor 9 covers the speed range of 0-3000rpm, and the energy recovery efficiency of the motor 9 is ≥23%.

[0051] Specifically, in this embodiment, the motor 9 is the power source of the equipment, and has characteristics such as constant torque and high speed. When the motor 9 is working, it drives the hydraulic system 10 to perform various actions of the equipment. When the motor 9 is not working, it reversely charges the battery to achieve energy recovery.

[0052] In a preferred embodiment of the present invention, the integrated cooling system 5 includes a three-channel independent cooling circuit, a control module for a variable frequency fan based on temperature gradient prediction, a dynamic cooling power allocation algorithm, a three-channel independent cooling circuit integrated hydraulic system, an integration unit and a motor cooling channel.

[0053] Specifically, in this embodiment, when the integrated cooling system 5 is operating, the hydraulic system, the integration unit 3 and the motor 9 will generate a large amount of heat, and the temperature will rise sharply. At this time, the integrated cooling system 5 reads the temperature signals of the hydraulic system, the integration unit 3 and the motor 9 through the control unit 4, intelligently judges the temperature and runs the system to cool down the hydraulic system, the integration unit 3 and the motor 9. The integrated cooling system 5 has a high degree of integration, is easy to install and debug, and intelligently allocates the cooling conditions of each system.

[0054] A control method for a pure electric control device of a crawler crane, the control method specifically comprising the steps of:

[0055] S1: Detect the mains connection status and the battery SOC when power is turned on, and display them on the control screen;

[0056] S2: During operation, the battery power level is compared with the working requirement threshold in real time, and the working mode is selected and automatically switched to any one of the working modes, namely, the towing operation mode, the working charging mode, the battery operation mode, the mains charging mode, and the DC charging mode, according to the working condition requirements;

[0057] S3: Real-time monitoring of temperature, power and SOC parameters during operation;

[0058] S4: Dynamically switch the working mode based on a multi-objective optimization algorithm;

[0059] S5: When charging is completed, the charging protection mechanism is automatically activated until charging is completed, power-off protection is automatically executed, and an operation report is generated.

[0060] Example 2

[0061] An example of a mode switching scenario of the present invention: after the crane is connected to a 380V mains power supply at the construction site, the control unit automatically enters the towing operation mode (SOC=65%). During the hoisting operation, it detects a mains power redundancy of 200kW, and the operation charging mode is started synchronously. After 2 hours, the SOC reaches 95%, and charging automatically stops (maintaining the towing operation). In the event of a sudden mains power outage, it switches to the battery operation mode within 0.5 seconds. After the operation is completed without disconnecting the mains power, it automatically switches to the mains charging mode until the SOC=100%. Response to extreme working conditions: When the ambient temperature is -28°C, the TMS system starts PTC heating to maintain the electrolyte temperature >0°C. When the hydraulic system overheats, the integrated cooling system distributes 70% of the air volume to the hydraulic circuit.

[0062] Specifically, the working principle of the present invention is as follows:

[0063] During use of the present invention, when the electric crawler crane vehicle is powered on before starting, the control unit 4 obtains the current connection status of the mains connection interface 6 and the power information of the battery system 1, and transmits them to the control panel, so that the driver can fully understand the current vehicle status before performing operations and prepare for entering the working state. At the same time, it is convenient to flexibly control the vehicle to enter different modes.

[0064] When the mains connection interface 6 is connected to the mains and meets the required standards, the control unit 4 controls the vehicle to directly enter the towing mode, where the mains power is supplied to the motor 9 via the integration unit 3, driving the hydraulic pump 10. Simultaneously, the control unit 4 automatically detects the battery system 1 charge level and the motor 9 output power. If the battery system 1 charge level does not meet the battery operation mode requirements, and the motor 9 output power still has surplus power to meet the towing operation requirements, the vehicle enters the working charging mode. In this mode, the mains power is used to drive the motor 9 via the integration unit 3, driving the hydraulic pump 10 while simultaneously charging the battery system 1. In this mode, when the battery system 1 is fully charged, the control unit 4 receives the battery system 1 charge level information and immediately automatically controls the battery system 1 to disconnect charging to protect the battery system 1 from overcharging. The vehicle then exits the working charging mode and returns to the towing mode, where the mains power continues to supply the motor 9 via the integration unit 3, with the motor 9 only driving the hydraulic pump 10. If the mains connection interface 6 fails to meet safety standards during towing, the connection detection and safety protection functions of the mains connection interface 6 will send a signal to the control unit 4, warning the driver to immediately suspend the operation and disembark for inspection and rectification.

[0065] When the towing operation is complete and the vehicle is turned off, if the mains connection remains connected, control unit 4 will again determine based on the collected information from battery system 1: if battery system 1 is low, it will be charged solely using the mains power through integration unit 3, and the vehicle will enter mains charging mode. In this mode, there is no need to wait for the mains connection to be disconnected. The control unit 4 intelligently detects in real time and automatically disconnects the mains when the battery system 1 is fully charged, thus protecting the battery system 1 and preventing continued energy waste without disconnecting the mains connection interface 6.

[0066] If the mains connection port 6 is not connected to the mains, the control unit 4 checks the battery system 1 charge level. If the current battery system 1 charge level meets the battery operation mode requirements, the vehicle enters the battery operation mode. In battery operation mode, the battery system 1 connects to the motor 9 via the integration unit 3 to drive the hydraulic pump 10. During operation, the control unit 4 continuously reads the battery system 1 charge level information and compares it with the vehicle's operating status information in real time. If the battery system 1 charge level does not meet the battery operation mode requirements, the control unit 4 immediately notifies the driver via the control screen to connect the mains connection port 6 to the mains to enter the towing operation mode or the working charging mode.

[0067] When the work location is inconvenient or even does not support towing operations, a portable DC power supply can be used to directly charge the battery system 1 through the DC charging port 7. This charging process is very efficient, can save charging time, and improve work efficiency.

[0068] The pure electric control device for an electric crawler crane in this application features five modes: towing operation mode, operation charging mode, battery operation mode, mains charging mode, and DC charging mode. These five modes are controlled by a control unit using real-time detection and signal transmission, offering advantages such as accurate judgment, stable control, flexible switching, and timely display. This ensures sufficient vehicle power, enabling smooth operation and adaptability to a variety of complex operating conditions. This invention addresses the shortcomings of existing technologies through multi-module collaborative control, while also prioritizing energy conservation and pollution reduction, in line with future national trends.

[0069] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0071] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A pure electric control device for a crawler crane, characterized in that: include: Battery system, TMS constant temperature system, integration unit, dual-mode charging interface, control unit, integrated cooling system and power actuator. The battery system includes a battery and a BMS battery management module integrated on the battery. The capacity of the battery system is ≥200.54kWh, and the charge and discharge rate is ≥0.6C. The TMS constant temperature system maintains the operating temperature of the battery system in the range of -35°C to 65°C. The integration unit includes an OBC module, a PDU module, an AC-DC and a DC-DC module. The integration unit supports multi-machine parallel connection and intelligent power distribution. The dual-mode charging interface includes a mains connection interface and a DC charging port. The mains The connection interface is arranged on the side of the machine body and adjacent to the crawler track. The AC power connection interface is connected to the integration unit through a central rotary joint. The DC charging port is connected to the battery system through the central rotary joint. The control unit is connected to each component through a CAN bus and obtains operating data in real time. The control unit automatically switches to any one of the towing operation mode, operation charging mode, battery operation mode, AC power charging mode, and DC charging mode according to the AC power connection status, battery power and load demand. The power actuator includes a motor and a hydraulic system. The integrated cooling system monitors the temperature of the motor, hydraulic system, and integration unit in real time through a temperature sensor.

2. The pure electric control device for a crawler crane according to claim 1, characterized in that: When the AC power connection interface is connected and meets safety standards, the control unit starts the towing operation mode, and the AC power drives the motor through the integration unit. In the towing operation mode, if the battery power is lower than the threshold and the AC power is redundant, the operation charging mode is synchronously started to charge the battery. When the AC power is not connected and the battery power meets the working conditions, the control unit starts the battery operation mode, and the battery drives the motor through the integration unit. When the equipment is shut down and the AC power is connected, the AC charging mode is started to charge the battery. When the DC charging port is connected to a power source, the control unit starts the DC charging mode to directly charge the battery.

3. The pure electric control device for a crawler crane according to claim 2, characterized in that: In the operating charging mode or the mains charging mode, the control unit monitors the battery SOC status in real time. When the SOC reaches 100%, the charging circuit is automatically cut off and the towing operation mode is maintained. An overcharge protection log is generated and transmitted to the control panel via the CAN bus.

4. The pure electric control device for a crawler crane according to claim 1, characterized in that: The OBC module supports a multi-machine parallel topology, and is based on the master-slave automatic allocation mechanism of the CAN communication. The PDU module dynamically adjusts the output power of each machine according to load demand to ensure that the charging and discharging efficiency is maximized.

5. The pure electric control device for a crawler crane according to claim 2, characterized in that: The TMS constant temperature system includes a distributed temperature sensor network, a bidirectional PTC heating / liquid cooling circulation module, and a temperature difference compensation algorithm activated under extreme working conditions.

6. The pure electric control device for a crawler crane according to claim 2, characterized in that: The mains connection interface is provided with a connection status detection circuit, an overvoltage / undervoltage protection relay, and a quick plug-in mechanism. The waterproof grade of the quick plug-in mechanism is IP68. The mains connection interface can be connected to the mains for towing operations or charge the battery system through the integrated unit and tow operations or charge the battery system separately.

7. The pure electric control device for a crawler crane according to claim 1, characterized in that: The battery system adopts a modular independent unit design, and realizes self-diagnosis and fault feedback through the BMS battery management module. The battery system supports the CAN bus communication, is compatible with multiple voltage platforms, and is equipped with a quick-release interface for easy replacement and maintenance.

8. The pure electric control device for a crawler crane according to claim 2, characterized in that: The motor is a permanent magnet synchronous motor, which is converted into a generator mode when lowering heavy objects to reversely charge the battery system. The constant torque output range of the motor covers the speed range of 0-3000rpm, and the energy recovery efficiency of the motor is ≥23%.

9. The pure electric control device for a crawler crane according to claim 1, characterized in that: The integrated cooling system includes: a three-channel independent cooling circuit, a control module for a variable frequency fan based on temperature gradient prediction, and a dynamic cooling power allocation algorithm. The three-channel independent cooling circuit integrates a hydraulic system, an integration unit, and a motor cooling channel.

10. A control method based on the device according to any one of claims 1 to 9, characterized in that: The specific steps include: S1: Detect the mains connection status and the battery SOC when power is turned on, and display them on the control screen; S2: During operation, the battery power level is compared with the working requirement threshold in real time, and the working mode is selected and automatically switched to any one of the working modes, namely, the towing operation mode, the working charging mode, the battery operation mode, the mains charging mode, and the DC charging mode, according to the working condition requirements; S3: Real-time monitoring of temperature, power and SOC parameters during operation; S4: Dynamically switch the working mode based on a multi-objective optimization algorithm; S5: When charging is completed, the charging protection mechanism is automatically activated until charging is completed, power-off protection is automatically executed, and an operation report is generated.

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