A double circuit system of stator pressure regulating driving scheme for a casting crane

Abstract

The application discloses a kind of casting crane stator pressure regulating driving scheme double-loop systems, comprising: motor stator unit, motor rotor unit and public equipment unit;The motor stator unit includes first stator voltage regulating speed regulating device, second stator voltage regulating speed regulating device, first incoming line switching contactor, second incoming line switching contactor, first outgoing line switching contactor, second outgoing line switching contactor;The public equipment unit includes first wound motor, second wound motor, first resistor, second resistor;The system realizes the switching work of motor stator, rotor part, power circuit, and carries out online double-loop system real-time switching by first working loop and second working loop, and one-key operation realizes the quick and reliable switching between first working loop and second working loop, to improve the reliability of electric control system, reduce equipment failure downtime, and improve enterprise production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of crane electrical control technology, and particularly relates to a dual-circuit system for stator voltage regulation drive of a casting crane. Background Technology

[0002] Casting cranes are key equipment in steelmaking (iron) production, used for lifting molten metal. They operate in harsh environments and require high operational standards. Therefore, the electrical drive system of casting cranes must be mature, reliable, and have backup switching capabilities to ensure long-term normal operation. Currently, while some casting cranes are equipped with main and backup voltage regulating devices, the input and output terminals of these devices are switched using two single-pole double-throw switches, a cumbersome switching method posing a risk of misoperation. Furthermore, the failure of any single-pole double-throw switch can paralyze the entire system. Additionally, only two sets of stator voltage regulating devices are designed for the motor stator circuit, without considering a dual-circuit design for the motor rotor. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention discloses a dual-loop system for stator voltage regulation drive of a casting crane, comprising:

[0004] Motor stator unit, motor rotor unit, and utility equipment unit;

[0005] The motor stator unit includes a first stator voltage and speed regulating device, a second stator voltage and speed regulating device, a first incoming line switching contactor, a second incoming line switching contactor, a first outgoing line switching contactor, and a second outgoing line switching contactor.

[0006] The utility unit includes a first wound-rotor motor, a second wound-rotor motor, a first resistor, and a second resistor;

[0007] The motor rotor unit includes a first rotor contactor, a second rotor contactor, a third rotor contactor, a fourth rotor contactor, a fifth rotor contactor, and a sixth rotor contactor.

[0008] The system also includes a rotor frequency feedback switching circuit, which includes a first speed control device selection switching contactor, a second speed control device selection switching contactor, a first motor selection switching contactor, and a second motor selection switching contactor.

[0009] The first stator voltage regulating and speed regulating device, the first incoming line switching contactor, the first outgoing line switching contactor, the first rotor contactor, the third rotor contactor, the fifth rotor contactor, and the first speed regulating device selection switching contactor form a first working circuit; the second stator voltage regulating and speed regulating device, the second incoming line switching contactor, the second outgoing line switching contactor, the second rotor contactor, the fourth rotor contactor, the sixth rotor contactor, and the second speed regulating device selection switching contactor form a second working circuit, wherein the first working circuit and the second working circuit adopt the same configuration and do not affect each other's operation.

[0010] The first stator voltage regulation and speed regulation device and the second stator voltage regulation and speed regulation device are digital thyristor commutation type voltage regulation and speed regulation devices.

[0011] The first incoming line switching contactor, the second incoming line switching contactor, the first outgoing line switching contactor, and the second outgoing line switching contactor are all reversible contactors with mechanical interlock.

[0012] The cables and fuses connecting the electrical equipment in the first and second working circuits are all independently configured and do not affect each other's operation.

[0013] The system uses a selector switch to control the operation of the incoming line switching contactor, the outgoing line switching contactor, the rotor contactor, and the device rotor feedback switching contactor, thereby realizing one-button switching between the first working circuit and the second working circuit.

[0014] The first speed control device selection switching contactor belongs to the first working circuit, and the second speed control device selection switching contactor belongs to the second working circuit. The first motor selection switching contactor and the second motor selection switching contactor are used for rotor frequency selection of the two motors, respectively.

[0015] By adopting the above technical solution, the present invention provides a dual-circuit system for stator voltage regulation drive of a casting crane. This system is based on the coordinated operation of a stator voltage regulation device, an input / output line switching contactor, a rotor contactor, a rotor feedback contactor, and a control circuit to achieve switching operations involving the motor stator, rotor, and power lines. The system performs real-time online switching between the first and second working circuits, and a one-button operation enables fast and reliable switching between the first and second working circuits. This improves the reliability of the electrical control system, reduces equipment downtime due to malfunctions, and increases enterprise production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural block diagram of the dual-loop system of the stator voltage regulation drive scheme for the casting crane of the present invention.

[0018] Figure 2 This is a structural block diagram of the rotor feedback selection switching circuit for the electric motor of the present invention. Detailed Implementation

[0019] To make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention:

[0020] like Figure 1 The dual-circuit system of stator voltage regulation drive scheme for a casting crane shown includes: a motor stator unit, a motor rotor unit, and a common equipment unit;

[0021] The motor stator unit includes a first stator voltage and speed regulating device 1-1, a second stator voltage and speed regulating device 1-2, a first incoming line switching contactor 2-1, a second incoming line switching contactor 2-2, a first outgoing line switching contactor 3-1, and a second outgoing line switching contactor 3-2.

[0022] The utility unit includes a first wound-rotor motor 4-1, a second wound-rotor motor 4-2, a first resistor 5-1, and a second resistor 5-2;

[0023] The motor rotor unit includes a first rotor contactor 6-1, a second rotor contactor 6-2, a third rotor contactor 6-3, a fourth rotor contactor 6-4, a fifth rotor contactor 6-5, and a sixth rotor contactor 6-6.

[0024] The system also includes a rotor frequency feedback switching circuit 7, which includes a first speed control device selection switching contactor 7-1, a second speed control device selection switching contactor 7-2, a first motor selection switching contactor 7-3, and a second motor selection switching contactor 7-4.

[0025] The first stator voltage regulating and speed regulating device 1-1, the first incoming line switching contactor 2-1, the first outgoing line switching contactor 3-1, the first rotor contactor 6-1, the third rotor contactor 6-3, the fifth rotor contactor 6-5, and the first speed regulating device selection switching contactor 7-1 form a first working circuit; the second stator voltage regulating and speed regulating device 1-2, the second incoming line switching contactor 2-2, the second outgoing line switching contactor 3-2, the second rotor contactor 6-2, the fourth rotor contactor 6-4, the sixth rotor contactor 6-6, and the second speed regulating device selection switching contactor 7-2 form a second working circuit, wherein the first working circuit and the second working circuit adopt the same configuration and do not affect each other's operation.

[0026] Furthermore, the first stator voltage regulation and speed regulation device 1-1 and the second stator voltage regulation and speed regulation device 1-2 are preferably digital thyristor commutation type voltage regulation and speed regulation devices to ensure reliable commutation and low failure rate; for large casting cranes, AC690V voltage level voltage regulation devices are preferred to reduce device capacity, reduce external size, and facilitate the layout and installation of electrical cabinets.

[0027] Furthermore, the first incoming line switching contactor 2-1 and the second incoming line switching contactor 2-2, as well as the first outgoing line switching contactor 3-1 and the second outgoing line switching contactor 3-2, are all reversible contactors with mechanical interlocks, which facilitates operation and avoids switching errors. Considering the operating frequency of the incoming and outgoing line contactors, they can be selected based on the current under AC-1 duty cycle.

[0028] Furthermore, the connecting cables (copper busbars) and fuses on the first and second working circuits are also independently configured and do not affect each other.

[0029] Furthermore, the six rotor contactors can be four-pole contactors or two-in-one contactless controllers.

[0030] Furthermore, the first motor selection switching contactor 7-3 and the second motor selection switching contactor 7-4 are used to select the rotor frequency of the two motors, respectively. It should be ensured that the rotor frequency feedback signal of the voltage regulating device is effectively connected and is only for the rotor frequency of one motor.

[0031] Furthermore, by using a two-position selector switch, the actions of the incoming line switching contactor, the outgoing line switching contactor, the rotor contactor, and the device rotor feedback switching contactor are controlled, thereby achieving one-button switching between the first working circuit and the second working circuit.

[0032] This invention discloses a dual-loop system for stator voltage regulation drive of a casting crane, which has the following beneficial effects:

[0033] 1) It has two sets of stator voltage and speed regulating devices, one for use and one for backup. When one set of devices fails, it can be quickly switched to the other set, reducing equipment downtime and ensuring the continuity of steelmaking (iron) production.

[0034] 2) The voltage regulating device has a pair of reversible contactors for both the inlet and outlet switching, which are used for the first working circuit and the second working circuit respectively. The two contactors do not affect each other, which improves the reliability of the electrical drive system.

[0035] 3) The motor rotor section adopts a dual-circuit system, realizing a complete online dual-circuit design for the entire drive circuit. This expands the system's backup coverage and improves its practicality.

[0036] 4) One-click operation enables quick and convenient switching between the first and second working circuits, reducing the labor intensity and operational risks for maintenance personnel and improving production efficiency.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-circuit system for stator voltage regulation drive of a casting crane, characterized in that... include: Motor stator unit, motor rotor unit, and utility equipment unit; The motor stator unit includes a first stator voltage and speed regulating device (1-1), a second stator voltage and speed regulating device (1-2), a first incoming line switching contactor (2-1), a second incoming line switching contactor (2-2), a first outgoing line switching contactor (3-1), and a second outgoing line switching contactor (3-2). The utility unit includes a first wound-rotor motor (4-1), a second wound-rotor motor (4-2), a first resistor (5-1), and a second resistor (5-2); The motor rotor unit includes a first rotor contactor (6-1), a second rotor contactor (6-2), a third rotor contactor (6-3), a fourth rotor contactor (6-4), a fifth rotor contactor (6-5), and a sixth rotor contactor (6-6). The system also includes a rotor frequency feedback switching circuit (7), which includes a first speed control device selection switching contactor (7-1), a second speed control device selection switching contactor (7-2), a first motor selection switching contactor (7-3), and a second motor selection switching contactor (7-4). The first stator voltage regulating and speed regulating device (1-1), the first incoming line switching contactor (2-1), the first outgoing line switching contactor (3-1), the first rotor contactor (6-1), the third rotor contactor (6-3), the fifth rotor contactor (6-5), and the first speed regulating device selection switching contactor (7-1) form a first working circuit; the second stator voltage regulating and speed regulating device (1-2), the second incoming line switching contactor (2-2), the second outgoing line switching contactor (3-2), the second rotor contactor (6-2), the fourth rotor contactor (6-4), the sixth rotor contactor (6-6), and the second speed regulating device selection switching contactor (7-2) form a second working circuit, wherein the first working circuit and the second working circuit adopt the same configuration and do not affect each other's operation.

2. The dual-circuit system for stator voltage regulation drive of a casting crane according to claim 1, characterized in that: The first stator voltage regulation and speed regulation device (1-1) and the second stator voltage regulation and speed regulation device (1-2) are digital thyristor commutation type voltage regulation and speed regulation devices.

3. The dual-circuit system for stator voltage regulation drive of a casting crane according to claim 1, characterized in that: The first incoming line switching contactor (2-1) and the second incoming line switching contactor (2-2); the first outgoing line switching contactor (3-1) and the second outgoing line switching contactor (3-2) are all reversible contactors with mechanical interlock.

4. The dual-circuit system for stator voltage regulation drive of a casting crane according to claim 1, characterized in that: The cables and fuses connecting the electrical equipment in the first and second working circuits are all independently configured and do not affect each other's operation.

5. A dual-circuit system for stator voltage regulation drive of a casting crane according to claim 1, characterized in that: The system uses a two-position selector switch to control the operation of the incoming line switching contactor, the outgoing line switching contactor, the rotor contactor, and the rotor feedback switching contactor of the voltage and speed regulating device, thereby realizing one-button switching between the first working circuit and the second working circuit.

6. The dual-circuit system for stator voltage regulation drive of a casting crane according to claim 1, characterized in that: The first speed control device selection switching contactor (7-1) belongs to the first working circuit, the second speed control device selection switching contactor (7-2) belongs to the second working circuit, and the first motor selection switching contactor (7-3) and the second motor selection switching contactor (7-4) are used for rotor frequency selection of the two motors respectively.

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