Driving control method and system for container spreader

Abstract

The invention mainly relates to the technical field of container lifting appliances, in particular to a driving control method and system for a container lifting appliance. A driving control method of a container lifting appliance comprises the following steps that various action instructions of the lifting appliance are obtained, and a preset mapping relation between various actions of the lifting appliance and a target rotating speed is established; when the action instruction of the lifting appliance is responded, based on the action instruction and the preset mapping relation, a target rotating speed corresponding to the current action instruction is searched, and the lifting appliance operates at the target rotating speed to realize execution of various actions of the lifting appliance; and when responding to the sling no-action instruction, running or stopping running at the rotating speed lower than all preset standby rotating speeds. And the rotating speed output of the system at any moment is ensured to be synchronous with the current actual working requirement, the idling in irrelevant action periods is eliminated, and the obvious energy-saving and consumption-reducing effects are achieved.

Description

Technical Field

[0001] This application mainly relates to the field of container spreader technology, and specifically to a drive control method and system for a container spreader. Background Technology

[0002] As a key piece of equipment in port loading and unloading systems (such as quay cranes, rubber-tired gantry cranes, and rail-mounted gantry cranes), container spreader systems provide power for actions such as twistlocking, guide plate movement, and telescopic movement. Currently, traditional hydraulic container spreader systems generally use fixed or variable displacement hydraulic systems driven by ordinary three-phase asynchronous motors. Ordinary three-phase asynchronous motors are usually directly connected to the industrial frequency grid, with a constant and non-adjustable speed. Moreover, during operation, the motor and the hydraulic pump it drives continue to run regardless of whether the spreader is performing any actions.

[0003] In actual port operations, a complete container loading and unloading cycle typically takes around 60 seconds. However, the core spin lock action of the spreader's hydraulic system takes only about 2 seconds, and the guide plate action takes only 5 to 7 seconds. This means that during a single operation cycle, the hydraulic system is in a no-load standby state for the vast majority of the time, while the power source continues to consume electrical energy. This "continuous operation, intermittent work" mode results in significant no-load losses and overflow losses, causing substantial unnecessary energy waste.

[0004] Therefore, in order to solve the technical problems of high energy consumption and poor operating economy of container spreader hydraulic systems, there is an urgent need for a hydraulic system control method that can reduce standby and operating energy consumption. Summary of the Invention

[0005] This application provides a drive control method and system for container spreaders, which can solve the technical problems of high energy consumption and poor operating economy in the hydraulic system of container spreaders.

[0006] The technical solution adopted in this application to solve the above-mentioned technical problems is a drive control method for a container spreader, which includes the following steps: Acquire various action commands of the spreader and establish a preset mapping relationship between the various actions of the spreader and the target rotation speed; When a lifting device receives an action command, based on the action command and the preset mapping relationship, a target rotation speed corresponding to the current action command is found, and the device operates at the target rotation speed to realize the execution of various actions of the lifting device; When the spreader does not respond to an action command, it will operate at a speed lower than all preset standby speeds or stop operating.

[0007] In one embodiment of this application, establishing the preset mapping relationship between the various actions and the target rotational speed further includes: Flow demand analysis is performed on various actions of the container spreader to determine the required working flow of the hydraulic system under these various action states; Based on the working flow rate and the displacement of the hydraulic pump, a preset mapping relationship between the lifting device's movement and the target speed of the variable frequency motor is calculated and established.

[0008] In one embodiment of this application, the action commands include: single and double box opening and closing, multiple guide plate actions, single and double box extension and retraction, single and double box switching actions, and standby state.

[0009] In one embodiment of this application, in the preset mapping relationship, the motor speed corresponding to the guide plate action is positively correlated with the number of guide plates that are simultaneously acting.

[0010] In one embodiment of this application, the preset mapping relationship is a fixed speed mapping table.

[0011] In one embodiment of this application, the target rotational speed corresponding to the single / double box opening and closing, single / double box extension and retraction, and single / double box switching actions includes: The single-box opening and closing interlocking action corresponds to a speed of 600-700 RPM at 612 RPM, while the double-box opening and closing interlocking action corresponds to a speed of 1100-1300 RPM at 1225 RPM. The single and double box extension and retraction, as well as the single and double box switching action, all correspond to 1400-150035 RPM.

[0012] In one embodiment of this application, the target rotational speed corresponding to the movement of the plurality of guide plates includes: A single guide plate movement corresponds to 200-400 RPM, two guide plate movements correspond to 500-700 RPM, three guide plate movements correspond to 800-1000 RPM, and four guide plate movements correspond to 1000-1100 RPM.

[0013] To achieve the above objectives, this application also provides a drive control system for a container spreader, employing the drive control method for a container spreader as described in claims, comprising a spreader controller, a frequency converter, a frequency converter motor, and a hydraulic system: The spreader controller is used to output a corresponding target speed control signal according to the spreader's action command and a preset mapping relationship. The frequency converter driver is electrically connected to the lifting device controller and is used to receive the target speed control signal; The variable frequency motor is electrically connected to the variable frequency driver, is driven by the variable frequency driver, and runs at the speed specified by the target speed control signal; The hydraulic system is mechanically connected to the variable frequency motor and is driven by the variable frequency motor to perform the corresponding actions of the lifting device.

[0014] In one embodiment of this application, the hydraulic system includes a hydraulic pump, a cylinder, and a hydraulic motor: The hydraulic pump is connected to the variable frequency motor drive and is used to provide suitable hydraulic power to the lifting device under the drive of the variable frequency motor. The hydraulic cylinder is used to realize the opening and closing locking action and the double box extension and retraction action; The hydraulic motor is used to realize the movement of the guide plate and the telescopic movement of the single box.

[0015] In one embodiment of this application, the spreader controller stores a fixed speed mapping table.

[0016] This application provides a drive control method and system for a container spreader, which combines a variable frequency drive and a variable frequency motor to control the speed of the container spreader according to different actions. This ensures that the speed output of the system at any time is synchronized with the current actual working requirements, eliminates idling during irrelevant actions, and has a significant energy-saving and consumption-reducing effect. Attached Figure Description

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 A structural diagram of the drive control system of a container spreader according to an embodiment of the present invention is disclosed; Figure 2 The diagram illustrates the steps of a drive control method for a container spreader according to an embodiment of the present invention. Figure 3 A flowchart of a drive control method for a container spreader according to an embodiment of the present invention is disclosed. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0019] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Furthermore, the terms "upper," "lower," "left," "right," "top," "bottom," "horizontal," and "vertical" used in the following description should be understood as the orientations shown in the relevant paragraphs and accompanying drawings. These relative terms are for illustrative purposes only and do not imply that the described apparatus must be manufactured or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] It is understood that although terms such as "first," "second," and "third" may be used herein to describe various components, regions, layers, and / or parts, these components, regions, layers, and / or parts should not be limited by these terms, and these terms are only used to distinguish different components, regions, layers, and / or parts. Therefore, the first components, regions, layers, and / or parts discussed below may be referred to as second components, regions, layers, and / or parts without departing from some embodiments of the present invention.

[0022] The drive control method for a container spreader provided in this application can be applied to, for example, Figure 1 The diagram shown illustrates the drive control system structure of a container spreader. This system includes a spreader controller 10, a frequency converter 20, a frequency converter motor 30, and a hydraulic system 40. The spreader controller 10 is used to output the corresponding target speed control signal according to the spreader's action command and a preset mapping relationship.

[0023] The spreader controller 10 serves as the control core, receiving action commands from the operating system or operator, and outputting speed control signals to the frequency converter 20 according to its internal logic.

[0024] The variable frequency drive 20 is electrically connected to the lifting device controller 10 and is used to receive the target speed control signal; The variable frequency motor 30 is electrically connected to the variable frequency driver 20, is driven by the variable frequency driver 20, and runs at the speed specified by the target speed control signal. The hydraulic system 40 is mechanically connected to the variable frequency motor 30 and is driven by the variable frequency motor 30 to perform the corresponding actions of the lifting device.

[0025] This application provides a low-energy container spreader drive control system that replaces a conventional three-phase asynchronous motor with a variable frequency control system (variable frequency drive and motor) capable of speed control. Different speed controls are applied based on the movement of the container spreader, and when the container spreader is not moving, the motor speed can be switched to a low speed or even the drive output can be shut off, thereby achieving energy saving and consumption reduction in the container spreader's hydraulic system.

[0026] In one embodiment, the hydraulic system 40 may include hydraulic components such as a hydraulic pump, a hydraulic cylinder, and a hydraulic motor, which together realize the corresponding actions of the lifting device.

[0027] The hydraulic pump is connected to the variable frequency motor drive and is used to provide suitable hydraulic power to the lifting device under the drive of the variable frequency motor. The hydraulic cylinder is used to realize the opening and closing locking action and the double box extension and retraction action; The hydraulic motor is used to realize the movement of the guide plate and the telescopic movement of the single box.

[0028] A variable frequency motor drives a hydraulic pump to provide pressurized oil to the entire hydraulic system. The hydraulic system is connected to cylinders and oil motors via pipelines to perform opening and closing actions, guide plate movements, and single / double box extension and retraction, switching, and other actions.

[0029] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, various steps can be processed in reverse order or simultaneously. Furthermore, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0030] Figure 2 The present invention discloses a step diagram of a drive control method for a container spreader according to an embodiment of the present invention, with reference to... Figure 2 As shown, the drive control method for the container spreader in this embodiment includes the following steps: Step S1: Obtain various action commands of the lifting device and establish a preset mapping relationship between the various actions and the target rotation speed; Step S2: When the lifting device receives an action command, based on the action command and the preset mapping relationship, find the target speed corresponding to the current action command, and run at the target speed to achieve efficient execution of various actions of the lifting device; Step S3: In response to the lack of a lifting command, operate at a speed lower than all preset standby speeds or stop operating.

[0031] This application provides a drive control method for a container spreader. By monitoring action commands in real time and based on a preset mapping relationship between various spreader actions and target speeds, the method dynamically and in real time outputs a speed control signal that is strictly matched to the current action to the frequency converter driver. When there are no action commands, it outputs extremely low speed or zero speed commands to ensure that the speed output of the spreader's related actions is synchronized with the current actual work requirements at any time, thus completely eliminating idling during irrelevant actions.

[0032] The steps of the drive control method for container spreaders proposed in this invention will be described in detail below. It should be understood that, within the scope of this invention, the above-described technical features and the technical features specifically described below (such as in the embodiments) can be combined and correlated with each other to constitute preferred technical solutions.

[0033] Step S1: Obtain various action commands of the lifting device and establish a preset mapping relationship between the various actions and the target rotation speed.

[0034] The lifting device has various action commands, including but not limited to: single and double box opening and closing, multiple guide plate actions, single and double box extension and retraction, single and double box switching actions, and standby status.

[0035] In one embodiment, establishing the preset mapping relationship between the various actions and the target rotational speed further includes: Flow demand analysis is performed on various actions of the container spreader to determine the required working flow of the hydraulic system under these various action states; Based on the working flow rate and the displacement of the hydraulic pump, a preset mapping relationship between the lifting device's movement and the target speed of the variable frequency motor is calculated and established.

[0036] In the preset mapping relationship, the motor speed corresponding to the single-box opening and closing action is lower than the motor speed corresponding to the double-box opening and closing action.

[0037] In the preset mapping relationship, the motor speed corresponding to the guide plate action is positively correlated with the number of guide plates that are simultaneously acting.

[0038] The motor speed corresponding to the single and double box telescopic action and the single and double box switching action is the highest operating speed among all actions.

[0039] In one embodiment, the target rotational speeds corresponding to the single / double box opening and closing, single / double box extension and retraction, and single / double box switching actions include: The opening and closing interlocking action in single-box mode corresponds to a speed of 600-700 RPM, and the opening and closing interlocking action in double-box mode corresponds to a speed of 1100-1300 RPM. The single and double box extension and retraction, as well as the single and double box switching action, all correspond to 1400-1500 RPM.

[0040] In one embodiment, the target rotational speed corresponding to the movement of the plurality of guide plates includes: A single guide plate movement corresponds to 200-400 RPM, two guide plate movements correspond to 500-700 RPM, three guide plate movements correspond to 800-1000 RPM, and four guide plate movements correspond to 1000-1100 RPM.

[0041] Optionally, the target rotational speeds corresponding to the single / double box opening and closing, single / double box extension and retraction, and single / double box switching actions include: The opening and closing interlocking action in single-box mode corresponds to 612 RPM, and the opening and closing interlocking action in double-box mode corresponds to 1225 RPM. The single and double box extension and retraction, as well as the single and double box switching action, all correspond to 1435 RPM.

[0042] A single guide plate movement corresponds to 303 RPM; two guide plates moving simultaneously correspond to 606 RPM; three correspond to 909 RPM; and four correspond to 1212 RPM, demonstrating the positive correlation between motor speed and the number of guide plates.

[0043] RPM (Revolutions Per Minute) is used to describe the number of revolutions an object makes per unit of time, representing revolutions per minute.

[0044] This embodiment makes the control logic extremely clear and easy to implement by clearly classifying instructions and specifying rotational speed values. Different rotational speeds are matched to actions with different flow requirements (such as single / double box interlocking), while actions with similar flow requirements (such as extension and switching) are matched to the same high speed. Furthermore, the guide plate rotational speed increases linearly with the number of guide plates, ensuring efficient completion of each action and minimizing energy consumption.

[0045] Furthermore, a fixed speed mapping table is preset to define the mapping relationship. As shown in Table 1, taking a hydraulic mobile double-box container spreader as an example, a speed mapping table is established based on the preset mapping relationship between various spreader actions and target speeds.

[0046] Table 1 Speed ​​Mapping Table

[0047] The numerical mapping table enables the spreader controller to quickly look up and execute commands, resulting in a rapid response.

[0048] It should be noted that the motor speed is calculated based on the oil pump displacement, the parameters of each actuator, and the working efficiency of the lifting device. Once these parameters are determined, the speed is also determined.

[0049] Step S2: When the lifting device receives an action command, based on the action command and the preset mapping relationship, find the target speed corresponding to the current action command, and run at the target speed to achieve efficient execution of various actions of the lifting device.

[0050] Step S3: In response to the lack of a lifting command, operate at a speed lower than all preset standby speeds or stop operating.

[0051] Figure 3 A flowchart of a drive control method for a container spreader according to an embodiment of the present invention is disclosed, in conjunction with... Figure 1 and Figure 3 As shown, after the container spreader's drive control system is powered on, the spreader controller 10 acquires various action commands from the spreader, which come from the upper management system or the driver's cab console.

[0052] The spreader controller 10 has a pre-set mapping relationship between various action commands and the target speed of the variable frequency motor. When the spreader controller 10 detects an action command (such as an "open / close" command), it first checks whether it is in a dual-box state. Based on the command, it queries the pre-set mapping relationship to find the corresponding target speed of the motor in the dual-box state (such as 1225 RPM in Table 1) and sends the speed command to the variable frequency drive 20.

[0053] The variable frequency drive 20 drives the variable frequency motor 30 to accelerate rapidly to the target speed, and the hydraulic pump outputs the corresponding flow rate to drive the corresponding cylinder to complete the action quickly and accurately. When the action is completed, the spreader controller 10 responds to the state of no action command and immediately controls the variable frequency motor 30 to switch to an extremely low standby speed (such as 100 RPM) or stop completely until the next action command arrives.

[0054] Other actions of the spreader follow the same operating procedures, such as the movement of multiple guide plates, the extension and retraction of single and double boxes, and the switching action between single and double boxes.

[0055] The mapping relationship establishment method provided in this embodiment ensures the optimality of the control strategy. The calculated target rotational speed can precisely meet the flow requirements of each action, and while ensuring the efficiency of the action, it completely avoids the overflow energy loss caused by providing excessive flow for small flow actions, thus achieving precise energy supply.

[0056] This application provides a drive control method and system for a container spreader, which uses a variable frequency drive and a motor. By establishing a preset mapping relationship between various spreader movements and target speeds, it ensures that the flow rate output by the hydraulic pump is highly matched with the needs of the actuator, thereby achieving precise energy saving, significantly reducing energy consumption, and improving system reliability and lifespan.

[0057] Those skilled in the art will understand that information, signals, and data can be represented using any of a variety of different techniques and skills. For example, the data, instructions, commands, information, signals, bits, symbols, and chips described throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0058] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps are described above in a generalized manner in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as departing from the scope of the invention.

[0059] The various illustrative logic modules and circuits described in conjunction with the embodiments disclosed herein may be implemented or performed using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, it may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0060] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor such that the processor can read and write information to / from the storage medium. In an alternative, the storage medium may be integrated into the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and storage medium may reside as discrete components in the user terminal.

[0061] In one or more exemplary embodiments, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functionality may be stored or transmitted as one or more instructions or code on or through a computer-readable medium. A computer-readable medium includes both computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. A storage medium may be any available medium accessible to a computer. By way of example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a computer. Any connection is also legitimately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of a medium. As used in this article, disk and disc include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), floppy disks, and Blu-ray discs. Disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of these should also be included within the scope of computer-readable media.

[0062] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0063] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0064] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used to describe embodiments are sometimes modified by the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in this application are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

Claims

1. A drive control method for a container spreader, characterized in that, Includes the following steps: Acquire various action commands of the spreader and establish a preset mapping relationship between the various actions of the spreader and the target rotation speed; When a lifting device receives an action command, based on the action command and the preset mapping relationship, a target rotation speed corresponding to the current action command is found, and the device operates at the target rotation speed to realize the execution of various actions of the lifting device; When the spreader does not respond to an action command, it will operate at a speed lower than all preset standby speeds or stop operating.

2. The drive control method for a container spreader as described in claim 1, characterized in that, The establishment of the preset mapping relationship between the various actions and the target rotation speed further includes: Flow demand analysis is performed on various actions of the container spreader to determine the required working flow of the hydraulic system under these various action states; Based on the working flow rate and the displacement of the hydraulic pump, a preset mapping relationship between the lifting device's movement and the target speed of the variable frequency motor is calculated and established.

3. The drive control method for a container spreader as described in claim 1, characterized in that, The action commands include: single and double box opening and closing, multiple guide plate actions, single and double box extension and retraction, single and double box switching actions, and standby state.

4. The drive control method for a container spreader as described in claim 3, characterized in that, In the preset mapping relationship, the motor speed corresponding to the guide plate action is positively correlated with the number of guide plates that are simultaneously acting.

5. The drive control method for a container spreader as described in claim 2, characterized in that, The preset mapping relationship is a fixed speed mapping table.

6. The drive control method for a container spreader as described in claim 5, characterized in that, The target rotational speeds corresponding to the single / double box opening and closing interlocking, single / double box extension and retraction, and single / double box switching actions include: The opening and closing interlocking action in single-box mode corresponds to a speed of 600-700 RPM, and the opening and closing interlocking action in double-box mode corresponds to a speed of 1100-1300 RPM. The single and double box extension and retraction, as well as the single and double box switching action, all correspond to 1400-1500 RPM.

7. The drive control method for a container spreader as described in claim 4, characterized in that, The target rotational speeds corresponding to the multiple guide plate movements include: A single guide plate movement corresponds to 200-400 RPM, two guide plate movements correspond to 500-700 RPM, three guide plate movements correspond to 800-1000 RPM, and four guide plate movements correspond to 1000-1100 RPM.

8. A drive control system for a container spreader, employing the drive control method for a container spreader as described in any one of claims 1-7, characterized in that, Includes spreader controller, frequency converter drive, frequency converter motor, and hydraulic system: The spreader controller is used to output a corresponding target speed control signal according to the spreader's action command and a preset mapping relationship. The frequency converter driver is electrically connected to the lifting device controller and is used to receive the target speed control signal; The variable frequency motor is electrically connected to the variable frequency driver, is driven by the variable frequency driver, and runs at the speed specified by the target speed control signal; The hydraulic system is mechanically connected to the variable frequency motor and is driven by the variable frequency motor to perform the corresponding actions of the lifting device.

9. The drive control system for the container spreader as described in claim 8, characterized in that, The hydraulic system includes a hydraulic pump, a hydraulic cylinder, and a hydraulic motor. The hydraulic pump is connected to the variable frequency motor drive and is used to provide suitable hydraulic power to the lifting device under the drive of the variable frequency motor. The hydraulic cylinder is used to realize the opening and closing locking action and the double box extension and retraction action; The hydraulic motor is used to realize the movement of the guide plate and the telescopic movement of the single box.

10. The drive control system for the container spreader according to claim 8, characterized in that, The lifting device controller stores a fixed speed mapping table.

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