Control system and control method for an electric crane

Abstract

The application discloses a control system and a control method of an electric hoist, and the system comprises: a first control device configured to send a first control signal of at least one electric hoist; a plurality of second control devices, each of which is configured to control a corresponding electric hoist according to the first control signal, wherein any one of the plurality of second control devices is a master control device, and the rest of the second control devices are slave control devices; the master control device is connected with the first control device through a first communication line; and the slave control devices are connected with the master control device through a second communication line. The application solves the technical problems of a complex wiring structure, a large size, a high cost and a limited expansion in the prior art.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more specifically, to a control system and control method for an electric crane. Background Technology

[0002] Electric cranes are mainly used in stage screen lighting hoisting and shaping, energy equipment maintenance, industrial assembly lines and other fields for lifting loads, positioning and raising, and monitoring load weight. Currently, electric cranes are mainly controlled by directly connecting cables to a PLC (Programmable Logic Controller) control cabinet for signal acquisition and control of the crane lifting contactor.

[0003] When there are many electric cranes that need to be controlled, the complex cable wiring structure can lead to problems such as excessive size, high cost, and limited expansion.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This invention provides a control system and control method for an electric crane, which at least solves the technical problems of complex wiring structure, large size, high cost, and limited expansion in the prior art.

[0006] According to one aspect of the present invention, a control system for an electric crane is provided, comprising: a first control device for sending a first control signal for at least one electric crane; a plurality of second control devices, each second control device being configured to control a corresponding electric crane according to the first control signal, wherein any one of the plurality of second control devices is a master control device, and the remaining second control devices are slave control devices; the master control device is connected to the first control device via a first communication line; and the slave control devices are connected to the master control device via a second communication line.

[0007] Optionally, the first control device includes: a display for displaying a human-machine interface, the human-machine interface for receiving a first control signal; a programmable controller for communicating with a second control device based on the first control signal; and an expansion module connected to the programmable controller for expanding the crane control functions.

[0008] Optionally, the slave control device and the master control device are connected via a second communication line, including: the slave control devices are connected to the master control device in parallel via the second communication line; or, the slave control devices are connected to the master control device serially via the second communication line.

[0009] Optionally, each second control device includes: a microcontroller for writing and controlling the control program; a drive contactor for driving the motor; and a communication interface connected to a first communication line or a second communication line for receiving a first control signal; wherein the drive contactor and the communication interface are respectively connected to the microcontroller.

[0010] Optionally, each second control device further includes: a sensor chip for monitoring load weight and temperature; and a current monitoring chip for monitoring the current in the circuit on the printed circuit board; wherein the sensor chip and the current monitoring chip are respectively connected to the microcontroller.

[0011] Optionally, the drive contactor, sensor detection chip, current monitoring chip, microcontroller, and communication interface are all integrated on a printed circuit board.

[0012] Optionally, each second control device further includes a power input module and a power output module; the power input module and the power output module are respectively connected to the microcontroller.

[0013] Optionally, the sensing chip also includes: a pressure sensor for detecting the weight of the load on the electric crane; and a temperature sensor for acquiring temperature data from the load's circuitry.

[0014] Optionally, each second control device includes: each second control device is installed inside or outside the electric crane; when each second control device is installed outside the electric crane, each second control device is connected to the corresponding electric crane via an coded cable, a modulus signal cable, a control signal cable, and a power output line.

[0015] Optionally, the coded cable is a coded multi-core cable, the modulo signal cable is a modulo multi-core cable, and the control signal cable is a control signal multi-core cable.

[0016] According to another aspect of the present invention, a control method for an electric crane is also provided, comprising: a master control device among a plurality of second control devices receiving a first control signal sent by a first control device; the master control device controlling a corresponding electric crane based on the first control signal and sending a second control signal to a slave control device among the second control devices; the slave control device controlling a corresponding electric crane based on the second control signal; wherein the master control device and the first control device are connected via a first communication line; and the slave control device and the master control device are connected via a second communication line.

[0017] According to another aspect of the present invention, a computer-readable storage medium is also provided, comprising a stored program, wherein, when the program is executed, the device on which the computer-readable storage medium is located executes the control method of the electric crane described above.

[0018] According to another aspect of the present invention, a processor is also provided for running a program, wherein the program executes the control method of the electric crane described above during runtime.

[0019] In this embodiment of the invention, a master-slave control method is adopted. A first control device is used to send a first control signal for at least one electric crane. Multiple second control devices are used to control the corresponding electric crane according to the first control signal. Any one of the multiple second control devices is the master control device, and the remaining second control devices are slave control devices. The master control device is connected to the first control device through a first communication line. The slave control devices are connected to the master control device through a second communication line. This simplifies the crane control structure and wiring structure, improves the crane's functional expansion capability, and achieves the technical effect of reducing the size of the crane control system and saving costs. This solves the technical problems of complex wiring structure, excessive size, high cost, and limited expansion in the prior art. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of an electric crane control system based on existing technology;

[0022] Figure 2 This is a schematic diagram of an electric crane control system based on existing technology;

[0023] Figure 3 This is a schematic diagram of an electric crane control system according to an embodiment of the present invention, in which the slave control device and the main control device are connected in series.

[0024] Figure 4 This is a schematic diagram of an electric crane control system according to an embodiment of the present invention, in which a slave control device and a master control device are connected in parallel.

[0025] Figure 5 This is a schematic diagram of a single second control device according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of multiple second control devices installed on the outside of an electric crane structure according to an embodiment of the present invention;

[0027] Figure 7 This is a flowchart of the steps of a control method for an electric crane according to an embodiment of the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] In existing electric crane control systems, such as Figure 1 As shown, a control system for an electric crane includes: a first control device 10, multiple electric cranes, cables, and a power input 40. The first control device 10 includes: a display 11, a programmable control module 12, and an expansion module 13. The expansion module 13 is an independent expansion product, typically connected to the expansion port or slot of a PLC. The expansion module 13 is generally used to expand other functions on the PLC's CPU, such as communication functions. Construction personnel perform complex logic programming on the electric crane control commands sent to the programmable control module 12 via the display 11. The expansion module 13 enables functional control expansion for multiple electric cranes. The control platform sends control commands for multiple electric cranes (e.g., electric crane 30) to the electric cranes via cables and controls the multiple electric cranes. The cables include: an coded cable 301, a modulo signal cable 302, and a control signal line 303.

[0031] Because the various cables of the previous type of electric crane control system are directly connected to the control platform, as the number of electric cranes increases, the number of cable connection interfaces on the control platform becomes limited. Figure 2As shown, another type of electric crane control system adds a switch 70 between the control platform and the motor. Each electric crane also includes a sub-control module, which comprises a contactor 201, an expansion module 202, and a PLC 203. The control platform is connected to the switch 70 via communication lines 80. The switch 70 is connected to the control modules (e.g., sub-control modules 21) via various communication lines 80. The sub-control modules are connected to each electric crane via various cables. Furthermore, because the electric cranes and control modules require different operating voltages, each electric crane and sub-expansion module are connected to separate power input lines 40. Due to the limited number of interfaces on the switch, the number of electric cranes that can be connected is also limited.

[0032] Existing electric cranes require PLCs and corresponding expansion modules to fulfill functions such as encoder connection, load monitoring, temperature monitoring, current monitoring, and switching. With a large number of cranes, this results in numerous and long cables. Furthermore, encoders have strict distance limitations; excessive distance can lead to pulse signal loss. This also places high technical demands on construction personnel. To avoid the 301 length issue with the encoder cables, using a single PLC for each crane can solve the distance problem. However, this still requires adding crane lifting contactors and their wiring connections, resulting in complex structures, large size, high costs, and limited expansion capabilities.

[0033] To address the aforementioned technical problems, the present invention provides the following technical solution. In this embodiment, a master-slave control method is adopted. A first control device is used to send a first control signal for at least one electric crane. Multiple second control devices are used to control a corresponding electric crane according to the first control signal. Any one of the multiple second control devices is the master control device, and the remaining second control devices are slave control devices. The master control device is connected to the first control device via a first communication line, and the slave control devices are connected to the master control device via a second communication line. This simplifies the crane control structure and wiring structure, improves the crane's functional expandability, and achieves the technical effect of reducing the size of the crane control system and saving costs. This solves the technical problems of complex wiring structures, excessive size, high cost, and limited expansion in the prior art.

[0034] Example 1

[0035] According to an embodiment of the present invention, a control system embodiment for an electric crane is provided. It should be noted that the specific implementation method and preferred embodiment in this embodiment are the same as or similar to those in the above embodiments, and will not be repeated here. Figure 3 This is a schematic diagram of a voice data processing system according to an embodiment of the present invention, combined with... Figure 3 The voice data processing system includes:

[0036] Figure 3 This is a schematic diagram of an electric crane control system according to an embodiment of the present invention, as shown below. Figure 3 As shown, the system includes:

[0037] The first control device 10 is used to send a first control signal to at least one electric crane 30;

[0038] Multiple second control devices 20 are provided, each second control device 20 being used to control a corresponding electric crane 30 according to a first control signal. Any one of the multiple second control devices 20 is a master control device 21, and the remaining second control devices 20 are slave control devices 22. The master control device 21 is connected to the first control device 10 via a first communication line 50, and the slave control devices 22 are connected to the master control device 21 via a second communication line 60.

[0039] Specifically, the first control device 10 can be a control device backstage, an operating platform on an electric crane on a construction site, or a computer, etc., without limitation. The second control device 20 can be an independent control device installed on the electric crane, or a remote control control device for each crane. The main control device 21 is a control device that can directly communicate with the first control device 10, and the main control device 21 can send electric crane control commands to the slave control device 22. The first communication line 50 and the second communication line 60 can be multi-core cables, such as three-core cables, without limitation.

[0040] In an optional embodiment, the first control device 10 and the second control device 20 communicate via a programmable logic controller (PLC) 12. The first control device 10 and the main control device 21 are remotely connected via a first communication line 50. Generally, before controlling the electric crane, a control scheme for the electric crane is first formulated; that is, the control program for the relevant electric crane is stored in the internal memory of the first control device 10. The operator sends control commands for the electric crane to one of the multiple second control devices 20, the main control device 21, through the first control device 10. The main control device 21, according to the first control command, controls its corresponding electric crane 30 and sends control commands to the electric crane of the slave control device 22 according to the first control command. The main control device 21 and the slave control device 22 are connected via a second communication line 60.

[0041] Optionally, such as Figure 3As shown, the first control device 10 includes: a display 11 for displaying a human-machine interface, the human-machine interface for receiving a first control signal; a programmable controller 12 for communicating with a second control device based on the first control signal; and an expansion module 13 connected to the programmable controller for expanding the crane control functions.

[0042] Specifically, the aforementioned display 11 can be a liquid crystal display (LCD), etc., without limitation. The programmable controller 12 can be a controller with functions such as logic operation, timing, counting, PID calculation, closed-loop control, and communication networking. The expansion module 13 can be used to expand other functions on the CPU of the programmable controller 12, such as a communication function module.

[0043] In an optional embodiment, the operator inputs a first control command for the electric crane onto the display 11 of the background computer (first control device), for example: controlled object: electric crane 30, control start, running time: 1 hour. Since each electric crane has a different operating sequence, the programmable controller 12 performs logical calculations based on the received first control command to generate the control sequence or logical conditions for each electric crane, i.e., controls the start or stop of the electric crane according to the sequence. Besides controlling the start of the crane, communication between the various devices is also required; therefore, the expansion module 13 can extend the communication function between the first control device 10 and the second control device 20.

[0044] Optionally, the slave control device and the master control device are connected via a second communication line, including: the slave control devices are connected to the master control device in parallel via the second communication line; or, the slave control devices are connected to the master control device serially via the second communication line.

[0045] In one alternative embodiment, such as Figure 3 As shown, the main control device 21 in the second control device 20 is based on a first control signal, for example: controlled object: first electric crane 30, control start, lifting speed: 12500 rpm, running time: 2 minutes; controlled object: second electric crane 30, lowering speed: 9000 rpm, running time: 2 minutes. The main control device 21 sends the control command for the second electric crane 30 to the first slave control device 22 via communication line 60. The first slave control device 22 controls the second electric crane 30 based on the received control command. Similarly, the second slave control device 22 receives the control command for the third electric crane 30 and sends it to itself via communication line 60. The second slave control device 22 controls the third electric crane 30 based on the received control command. The second slave control device 22 is connected to the first slave control device 22, and the first slave control device 22 is connected to the main control device 21 (i.e., the slave and main control devices are connected in series).

[0046] like Figure 4 As shown, the main control device 21 in the second control device 20 controls the first electric crane 30 based on the first control signal. For example: controlled object: first electric crane 30, control start, lifting speed: 12500 rpm, running time: 2 minutes. The main control device 21 sends the control command for the second electric crane 30 (for example: controlled object: second electric crane 30, lowering speed: 9000 rpm, running time: 2 minutes) to the first slave control device 22 via communication line 60. The first slave control device 22 controls the second electric crane 30 based on the received motor control command. The first slave control device 22 controls itself based on the control command for the second electric crane 30 sent by the main control device 21. The second slave control device 22 controls the second electric crane 30 based on the received control command. The first and second slave control devices 22 are respectively connected to the main control device 21 (i.e., the slave control devices are connected in parallel with the main control device).

[0047] It should be noted that the main control device 21 can control multiple slave control modules through expansion modules, which can be 10, 32, or 256, and can be expanded according to actual needs. Figure 3 and Figure 4 Multiple second control devices 20 are installed inside the electric crane.

[0048] Optionally, such as Figure 5 As shown, each second control device includes: a microcontroller 204 for writing and controlling the control program; a drive contactor for driving the motor; and a communication interface connected to a first communication line or a second communication line for receiving a first control signal; wherein the drive contactor and the communication interface are respectively connected to the microcontroller 204.

[0049] Specifically, the 204 microcontroller is a type of microcomputer, also known as a microcontroller, which integrates the central processing unit (CPU), memory, and communication interface of a control device onto a single silicon chip. The drive contactor, generally divided into AC and DC contactors, uses the current flowing through the coil to generate a magnetic field, causing the contacts to close and thus controlling the load. The communication interface is used for communication or data transmission between different devices or equipment; for example, it can be a Modbus interface (RS485 interface), RTU interface, Internet interface, CAN bus interface (DMX512), or fiber optic interface, without limitation here.

[0050] In one optional embodiment, the second control device 20 and the programmable controller 12 in the first control device 10 establish a connection, create a common data area, transmit data through the first communication line 50, and initialize the communication interface. After power-on, the microcontroller 204 periodically scans the data transmitted through the communication interface, reads and writes the data, or sends the data to a designated port, for example: Figure 3 As shown, the main control device 21 sends control commands for the electric crane to the port of the control device 22. Furthermore, the microcontroller 204 outputs high and low level control contactors based on timing signals stored in its memory. For example, if the microcontroller 204 in the main controller 21 sends a high level (1) to the switch drive contactor of the electric crane 30, then the electric crane 30 is ready to power on.

[0051] like Figure 5 As shown in the schematic diagram of a single second control device 20, multiple expansion modules, including a forward contactor 205, a reverse contactor 206, a main power contactor 207, a power input module 208, an I / O interface 210, and a power output module 209, are connected to the microcontroller 204 and integrated onto a printed circuit board. The forward contactor 205 is used to control the pulley to rotate counterclockwise when the electric crane needs to rise. Similarly, the reverse contactor 206 is used to control the pulley to rotate clockwise when the electric crane needs to descend. The power input module 208 provides voltage to each control module to enable normal operation. The I / O interface 210 connects to various communication lines to enable data transmission between the control modules. The power output module converts the input voltage into the operating voltage required by each control module. This design solves the problems of complex structure, large size, high cost, and limited expansion caused by the need for additional wiring in existing technologies, and also addresses the issue that programmable controllers cannot directly drive motors.

[0052] Optionally, each second control device further includes: a sensor chip for monitoring load weight and temperature; and a current monitoring chip for monitoring the current in the circuit on the printed circuit board; wherein the sensor chip and the current monitoring chip are respectively connected to the microcontroller.

[0053] Specifically, the sensing chip includes a pressure sensor and a temperature sensor. The pressure sensor is used to detect the weight of the load on the electric crane, while the temperature sensing chip is used to collect temperature data of the load's circuitry.

[0054] In one alternative embodiment, such as Figure 5As shown, the microcontroller 204 is powered on via the power input and controls the pressure and temperature sensors to monitor the load weight and circuit temperature of the electric crane. When the load current of the electric crane increases, the temperature will rise, easily causing current imbalance and leading to circuit malfunction. Therefore, for circuit temperature monitoring, an alarm is triggered when the temperature exceeds the maximum temperature value during normal operation of the electric crane. The current monitoring chip detects the current in the load circuit; during normal operation, the load current should not exceed the rated value on the nameplate. It should be noted that the microcontroller 204 is also connected to an encoder, temperature sensor, pressure sensor, and switch via connection terminals (the connection terminals, encoder, temperature sensor, pressure sensor, and switch are not shown in the diagram). The encoder, used to control multiple electric motors, needs to be designed. Generally, the control timing uses letters or numbers to represent the minimum state in the minimum state table, assigning a binary code. This binary code is converted into high and low levels to control the state of the electric crane. The temperature sensor monitors the temperature of each circuit; when the temperature exceeds the maximum temperature threshold that each circuit can withstand, an alarm is triggered and the motor stops working. Pressure sensors are used to measure the weight the electric crane can bear, in order to calculate the required torque and gear speed when designing the crane's ascent and descent. Switches control the operation and stop of each motor. The power input module 208 powers on the control device, converting the voltage to the voltage and current required by the control device, such as 100-240V to 8-4A, where 100-240V is the acceptable input voltage range and 8-4A is the acceptable input current. The power output module 209 converts the input voltage to the appropriate operating voltage for each module. For example, the microcontroller 204 requires 3-5V, and the memory slot requires a voltage conversion from 3.3V to -1.2V or +5V. It should be noted that high and low voltage electrical component modules are integrated according to the crane's functional requirements and connected serially using communication methods.

[0055] Optionally, the drive contactor, sensor detection chip, current monitoring chip, microcontroller, and communication interface are all integrated on a printed circuit board.

[0056] Optionally, each second control device further includes a power input module and a power output module; the power input module and the power output module are respectively connected to the microcontroller.

[0057] Optionally, the sensing chip also includes: a pressure sensor for detecting the weight of the load on the electric crane; and a temperature sensor for acquiring temperature data from the load's circuitry.

[0058] Optionally, each second control device includes: each second control device is installed inside or outside the electric crane; when each second control device is installed outside the electric crane, each second control device is connected to the corresponding electric crane via an coded cable, a modulus signal cable, a control signal cable, and a power output line.

[0059] In one alternative embodiment, such as Figure 6 As shown, when multiple second control devices 20 are installed outside the electric crane, each second control device 20 is connected to the corresponding electric crane via an encoding cable 301, a modulus signal cable 302, a control signal cable 303, and a power output line 41. The encoding cable 301, modulus signal cable 302, control signal cable 303, and power output line 41 are respectively connected to the main control device 21 and slave control devices 22 and 23 of the second control device 20, avoiding direct connection to the first control device 10. This solves the technical problem that the limited number of interfaces of the first control device 10 restricts the expansion of the electric crane.

[0060] Optionally, the encoding cable is an encoder multi-core cable, the modulus signal cable is a modulus multi-core cable, and the control signal cable is a control signal multi-core cable.

[0061] Example 2

[0062] According to another aspect of the present invention, a control method for an electric crane is also provided. The specific implementation methods and preferred embodiments of the electric crane control method in this embodiment are applicable to the above-described system and will not be elaborated upon here. Figure 7 As shown, the method includes the following steps:

[0063] In step S702, the main control device among the multiple second control devices receives the first control signal sent by the first control device;

[0064] In step S704, the main control device controls the corresponding electric crane based on the first control signal and sends a second control signal to the slave control device in the second control device.

[0065] Step S706: The control device controls the corresponding electric crane based on the second control signal;

[0066] The main control device is connected to the first control device via a first communication line; the slave control device is connected to the main control device via a second communication line.

[0067] Example 3

[0068] According to another aspect of the present invention, a computer-readable storage medium is also provided, comprising a stored program, wherein, when the program is executed, the device on which the computer-readable storage medium is located executes the control method of the electric crane described above.

[0069] Example 4

[0070] According to another aspect of the present invention, a processor is also provided for running a program, wherein the program executes any one of the electric crane control methods described above during runtime.

[0071] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0072] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0074] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0075] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0076] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0077] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A control system of an electric crane, characterized in that, The application relates to a control system of an electric hoist, comprising: a first control device for sending a first control signal of at least one electric hoist; a plurality of second control devices, each of which is used for controlling a corresponding electric hoist according to the first control signal, wherein any one of the plurality of second control devices is a master control device, and the rest of the second control devices are slave control devices; the master control device is connected with the first control device through a first communication line; the slave control devices are connected with the master control device through a second communication line; the second control device comprises an independent control device or a remote control device; wherein each of the second control devices further comprises a sensing detection chip for monitoring load weight and temperature, and a current monitoring chip for monitoring the current of a circuit on a printed circuit board.

2. A control system for an electric crane according to claim 1, characterized in that The first control device comprises: a display for displaying a man-machine interface, wherein the man-machine interface is used for receiving the first control signal; a programmable controller for communicating with the second control device based on the first control signal; an expansion module connected with the programmable controller, and used for expanding the hoist control function.

3. The control system of a motorized crane according to claim 1, characterized in that, The slave control devices are respectively connected with the master control device in parallel through the second communication line; or the slave control devices are connected with the master control device in series through the second communication line.

4. The control system of a motorized crane according to claim 1, characterized in that, Each of the second control devices comprises: a single-chip microcomputer for controlling program writing and control; a drive contactor for motor driving; a communication interface connected with the first communication line or the second communication line, and used for receiving and sending the first control signal; wherein the drive contactor, the communication interface, the sensing detection chip and the current monitoring chip are respectively connected with the single-chip microcomputer.

5. A control system for an electric crane according to claim 4, characterized in that The drive contactor, the sensing detection chip, the current monitoring chip, the single-chip microcomputer and the communication interface are integrated on the printed circuit board.

6. The control system of a motorized crane according to claim 4, characterized in that, Each of the second control devices further comprises a power input module and a power output module, and the power input module and the power output module are respectively connected with the single-chip microcomputer.

7. The control system of a motorized crane according to claim 4, characterized in that, The sensing detection chip further comprises: a pressure sensor for detecting the weight of a load of the electric hoist; a temperature sensor for collecting temperature data of a circuit of the load.

8. The control system of an electric crane according to any one of claims 1 to 7, characterized in that, Each of the second control devices is installed inside or outside the electric hoist; in the case that the plurality of second control devices are installed outside the electric hoist, each of the second control devices is connected with a corresponding electric hoist through a coding cable, a modulus signal cable, a control signal cable and a power output cable.

9. A control system for an electric crane according to claim 8, characterized in that The coding cable is a coding multi-core cable, the modulus signal cable is a modulus multi-core cable, and the control signal cable is a control signal multi-core cable.

10. A control method of an electric crane, characterized by, The application relates to a control system of an electric hoist, comprising: a master control device of a plurality of second control devices receives a first control signal sent by a first control device; the master control device controls a corresponding electric hoist based on the first control signal, and sends the first control signal to a slave control device of the second control devices. The slave control device controls the corresponding electric hoist based on the first control signal; The main control device is connected with the first control device through a first communication line; and the slave control device is connected with the main control device through a second communication line.

11. A computer readable storage medium, characterized in that, The storage medium comprises a stored program, and the program, when executed, controls a device in which the computer readable storage medium is located to perform the control method of the electric hoist according to claim 10.

12. A processor, comprising: The processor is configured to execute a program, and the program, when executed, performs the control method of the electric hoist according to claim 10.

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