Crane multi-mechanism integrated frequency conversion speed regulation control system

Abstract

The utility model provides a multi-mechanism integrated variable frequency speed regulation control system of a crane, so that the whole control system is simple in structure, and the protection function and the control function of the system are ensured. The system comprises a rectification unit which provides a power supply for the system and protection of overload, short circuit, overcurrent, overvoltage and undervoltage of a line; a control unit; the first inverter unit is used for controlling a main lifting main transmission motor and a main lifting brake; the second inverter unit is used for controlling an auxiliary lifting main transmission motor and an auxiliary lifting brake; the third inverter unit is used for controlling a cart main transmission motor and a cart brake; the fourth inverter unit is used for controlling a trolley main transmission motor and a trolley brake; the input end of the rectification unit is connected with a three-phase alternating current, the output end of the rectification unit outputs the three-phase alternating current and a direct current power supply, the rectification unit is also externally connected with a brake resistor, and the output end of the rectification unit is respectively connected with all the inversion units which are arranged in parallel through lines.

Description

Technical Field

[0001] This utility model relates to the technical field of crane control, specifically to a multi-mechanism integrated variable frequency speed control system for cranes. Background Technology

[0002] Currently, most crane frequency converter control systems use one frequency converter installed in one frequency converter control box to control one mechanism of the crane. Since a crane has four mechanisms—main hoisting, auxiliary hoisting, trolley mechanism, and crane mechanism—four control boxes are needed to house four frequency converters. This results in a large number of control boxes, leading to a large footprint and high cost. To address this, existing technology stacks the frequency converter control boxes for the four mechanisms into a single large frequency converter control box. However, this method lacks comprehensive control and protection functions. Because four frequency converter control boxes are packed into one large box, users need to configure relevant protection and control functions according to site conditions, leading to complex cable routing and a large amount of construction work. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a multi-mechanism integrated variable frequency speed control system for cranes. It integrates four independent variable frequency control mechanisms into four parallel inverter units, and controls the operation of the four inverter units through a rectifier unit and a control unit. This simplifies the overall control system structure while ensuring the system's protection and control functions.

[0004] A multi-mechanism integrated variable frequency speed control system for cranes, characterized in that it comprises:

[0005] The rectifier unit provides power to the system and protects the lines from overload, short circuit, overcurrent, overvoltage, and undervoltage.

[0006] Control unit;

[0007] The first inverter unit is used to control the main hoisting drive motor and the main hoisting brake.

[0008] The second inverter unit is used to control the auxiliary lifting main drive motor and the auxiliary lifting brake.

[0009] The third inverter unit is used to control the main drive motor and brake of the trolley.

[0010] And the fourth inverter unit, which is used to control the main drive motor of the trolley and the trolley brake;

[0011] The input terminal of the rectifier unit is connected to three-phase AC power, and the output terminal of the rectifier unit outputs three-phase AC power and DC power supply. The rectifier unit is also connected to an external braking resistor. The output terminal of the rectifier unit is connected to the first inverter unit, the second inverter unit, the third inverter unit, and the fourth inverter unit arranged in parallel through lines.

[0012] Its further features are:

[0013] The rectifier unit includes a first circuit breaker, a second circuit breaker, a rectifier module, and a braking module. The R / S / T terminals of the first circuit breaker and the second circuit breaker are respectively connected to an AC 380V 50HZ power supply. The output terminal of the first circuit breaker is connected to the rectifier module and then connected to the first inverter unit through the + / - terminal to provide it with DC power. The second circuit breaker is connected to the first inverter unit through the L1 / L2 / L3 terminals to provide it with AC power.

[0014] The braking module is configured as a braking resistor, and the first circuit breaker and the second circuit breaker are connected to the braking resistor through terminals B1 / B2.

[0015] The control unit is connected to the first inverter unit via a first connection line, the first inverter unit is connected to the second inverter unit via a second connection line, the second inverter unit is connected to the third inverter unit via a third connection line, and the third inverter unit is connected to the fourth inverter unit via a fourth connection line. The control unit controls the connection of all inverter units via the first, second, third, and fourth connection lines.

[0016] Each inverter unit includes an IGBT module, a circuit breaker, and a contactor;

[0017] The input terminal of the IGBT module of each inverter unit is connected to the DC power supply. The IGBT module converts the DC power supply into AC power and connects to its respective drive motor through the output terminal, thereby providing the drive motor with an adjustable frequency AC power supply.

[0018] The AC power output from the rectifier unit is connected to the corresponding brake through a circuit breaker and a contactor.

[0019] The control unit drives the IGBT module to provide an adjustable frequency AC power supply to the corresponding drive motor, and controls the operation of the corresponding brake by controlling the opening and closing of the circuit breaker.

[0020] This invention simplifies four independent frequency converter control mechanisms for controlling corresponding drive motors and brakes into corresponding inverter units. These four inverter units are then connected in parallel to a rectifier unit, allowing the rectifier unit to independently output three-phase AC and DC power to each inverter unit. Simultaneously, the control unit independently controls each inverter unit. By integrating four independent frequency converter control mechanisms into four parallel inverter units, and controlling the operation of the four inverter units through the rectifier unit and control unit, the entire control system has a simple structure while ensuring the system's protection and control functions. Attached Figure Description

[0021] Figure 1 This is a schematic block diagram of the structure of this utility model. Detailed Implementation

[0022] A multi-mechanism integrated variable frequency speed control system for cranes, see Figure 1 It includes a rectifier unit 1, a control unit 2, a first inverter unit 3, a second inverter unit 4, a third inverter unit 5, and a fourth inverter unit 6;

[0023] The rectifier unit 1 provides power to the system and provides protection against overload, short circuit, overcurrent, overvoltage, and undervoltage of the line. The input terminal of the rectifier unit 1 is connected to three-phase AC power, and the output terminal of the rectifier unit 1 outputs three-phase AC power and DC power. The output terminal of the rectifier unit 1 is connected to the first inverter unit 3, the second inverter unit 4, the third inverter unit 5, and the fourth inverter unit 6 arranged in parallel through lines.

[0024] The first inverter unit 3 is used to control the main hoisting main drive motor 301 and the main hoisting brake 302. The main hoisting main drive motor 301 needs to be connected to frequency-adjustable AC power, and the main hoisting brake 302 needs to be connected to three-phase AC power.

[0025] The second inverter unit 4 is used to control the auxiliary lifting main drive motor 401 and the auxiliary lifting brake 402. The auxiliary lifting main drive motor 401 needs to be connected to frequency-adjustable AC power, and the auxiliary lifting brake 402 needs to be connected to three-phase AC power.

[0026] The third inverter unit 5 is used to control the main drive motor 501 and the brake 502 of the trolley. The main drive motor 501 needs to be connected to the frequency adjustable AC power, and the brake 502 needs to be connected to the three-phase AC power.

[0027] The fourth inverter unit 6 is used to control the main drive motor 601 and the brake 602 of the trolley. The main drive motor 601 needs to be connected to AC power with adjustable frequency, and the brake 602 needs to be connected to three-phase AC power.

[0028] In specific implementation, rectifier unit 1 includes a first circuit breaker Q1, a second circuit breaker Q2, a rectifier module, and a braking module. The R / S / T terminals of the first circuit breaker Q1 and the second circuit breaker Q2 are respectively connected to an AC 380V 50HZ power supply. The output terminal of the first circuit breaker Q1 is connected to the rectifier module, and then connected to the DC input port of the first inverter unit 3 through the + / - terminal to provide it with DC power. The second circuit breaker Q2 is connected to the three-phase AC input port of the first inverter unit 3 through the L1 / L2 / L3 terminals to provide it with AC power.

[0029] The DC input port of the first inverter unit 3 is connected to the DC input port of the second inverter unit 4 through the first DC conduction line 11. The DC input port of the second inverter unit 4 is connected to the DC input port of the third inverter unit 5 through the second DC conduction line 12. The DC input port of the third inverter unit 5 is connected to the DC input port of the fourth inverter unit 6 through the third DC conduction line 13. The three-phase AC input port of the first inverter unit 3 is connected to the three-phase AC input port of the second inverter unit 4 through the first AC conduction line group 14. The three-phase AC input port of the second inverter unit 4 is connected to the three-phase AC input port of the third inverter unit 5 through the second AC conduction line group 15. The three-phase AC input port of the third inverter unit 5 is connected to the three-phase AC input port of the fourth inverter unit 6 through the third AC conduction line group 16. This allows the three-phase AC power and DC power supply of the rectifier unit 1 to be connected in parallel to the corresponding three-phase AC input port and DC input port of all inverter units.

[0030] In practice, the braking module is set as braking resistor 101, and the first circuit breaker Q1 and the second circuit breaker Q2 are connected to the braking resistor 101 on site through the B1 / B2 terminals.

[0031] Control unit 2 is connected to first inverter unit 3 via first connection line 21. First inverter unit 3 is connected to second inverter unit 4 via second connection line 22. Second inverter unit 4 is connected to third inverter unit 5 via third connection line 23. Third inverter unit 5 is connected to fourth inverter unit 6 via fourth connection line 24. Control unit 2 controls the connection of all inverter units via first connection line 21, second connection line 22, third connection line 23, and fourth connection line 24.

[0032] Each inverter unit includes an IGBT module, a circuit breaker, and a contactor. The input terminal of the IGBT module in each inverter unit is connected to a DC power supply. The IGBT module converts the DC power supply into AC power and connects it to its respective drive motor through the output terminal, thereby providing the drive motor with an adjustable frequency AC power supply. The AC power output from the rectifier unit is connected to the corresponding brake through the circuit breaker and contactor.

[0033] Control unit 2 drives the IGBT module to provide the corresponding drive motor with an adjustable frequency AC power supply, and controls the operation of the corresponding brake by controlling the opening and closing of the circuit breaker.

[0034] It simplifies four frequency converter control mechanisms used to independently control corresponding drive motors and brakes into corresponding inverter units, thereby connecting the four inverter units in parallel to the rectifier unit. This allows the rectifier unit to independently output three-phase AC and DC power to each inverter unit, while the control unit independently controls each inverter unit. By integrating four independent frequency converter control mechanisms into four parallel inverter units, and controlling the operation of the four inverter units through the rectifier unit and control unit, the entire control system has a simple structure while ensuring the system's protection and control functions.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-mechanism integrated variable frequency speed control system for cranes, characterized in that, It includes: The rectifier unit provides power to the system and protects the lines from overload, short circuit, overcurrent, overvoltage, and undervoltage. Control unit; The first inverter unit is used to control the main hoisting drive motor and the main hoisting brake. The second inverter unit is used to control the auxiliary lifting main drive motor and the auxiliary lifting brake. The third inverter unit is used to control the main drive motor and brake of the trolley. And the fourth inverter unit, which is used to control the main drive motor of the trolley and the trolley brake; The input terminal of the rectifier unit is connected to three-phase AC power, and the output terminal of the rectifier unit outputs three-phase AC power and DC power supply. The rectifier unit is also connected to an external braking resistor. The output terminal of the rectifier unit is connected to the first inverter unit, the second inverter unit, the third inverter unit, and the fourth inverter unit arranged in parallel through lines.

2. The crane multi-mechanism integrated variable frequency speed control system according to claim 1, characterized in that: The rectifier unit includes a first circuit breaker, a second circuit breaker, a rectifier module, and a braking module. The R / S / T terminals of the first and second circuit breakers are respectively connected to an AC 380V 50HZ power supply. The output terminal of the first circuit breaker is connected to the rectifier module and then connected to the first inverter unit through the + / - terminals to provide it with DC power. The second circuit breaker is connected to the first inverter unit through the L1 / L2 / L3 terminals to provide it with AC power.

3. The crane multi-mechanism integrated variable frequency speed control system according to claim 2, characterized in that: The braking module is configured as a braking resistor, and the first circuit breaker and the second circuit breaker are connected to the braking resistor through terminals B1 / B2.

4. The crane multi-mechanism integrated variable frequency speed control system according to claim 1, characterized in that: The control unit is connected to the first inverter unit via a first connecting line. The first inverter unit is connected to the second inverter unit via a second connecting line. The second inverter unit is connected to the third inverter unit via a third connecting line. The third inverter unit is connected to the fourth inverter unit via a fourth connecting line. The control unit controls the connection of all inverter units via the first, second, third, and fourth connecting lines.

5. The crane multi-mechanism integrated variable frequency speed control system according to claim 1, characterized in that: Each inverter unit includes an IGBT module, a circuit breaker, and a contactor.

6. The crane multi-mechanism integrated variable frequency speed control system according to claim 5, characterized in that: The input terminal of the IGBT module of each inverter unit is connected to the DC power supply. The IGBT module converts the DC power supply into AC power and connects to its respective drive motor through the output terminal, thereby providing the drive motor with an adjustable frequency AC power supply.

7. The crane multi-mechanism integrated variable frequency speed control system according to claim 5, characterized in that: The AC power output from the rectifier unit is connected to the corresponding brake through a circuit breaker and a contactor.

8. A crane multi-mechanism integrated variable frequency speed control system according to claim 5, characterized in that: The control unit drives the IGBT module to provide an adjustable frequency AC power supply to the corresponding drive motor, and controls the operation of the corresponding brake by controlling the opening and closing of the circuit breaker.

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