Two-electric three-furnace switching device for electric induction furnace

Abstract

The utility model relates to a two-electric three-furnace switching device for an electric induction furnace. The two-electric three-furnace switching device comprises a first furnace body, a second furnace body, a third furnace body, a hydraulic control system, a first driving power supply and a second driving power supply, the first furnace body comprises a first opening-closing brake, the second furnace body comprises a second opening-closing brake and a third opening-closing brake, the third furnace body comprises a fourth opening-closing brake, the second opening-closing brake is arranged close to the first opening-closing brake, and the third opening-closing brake is arranged close to the fourth opening-closing brake; the multiple opening and closing switches are all connected to the hydraulic control system. The voltage output end of the first driving power supply is electrically connected to the power supply end of the first opening-closing brake, and the power supply end of the first opening-closing brake is electrically connected to the power supply end of the second opening-closing brake through an interconnection bus; the voltage output end of the second driving power supply is electrically connected to the power supply end of the fourth opening and closing brake, and the power supply end of the fourth opening and closing brake is electrically connected to the power supply end of the third opening and closing brake through the interconnection bus. The method has the advantages that switching efficiency is improved, and the problem that whole-line shutdown is needed for maintenance is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of induction furnaces, and in particular to a two-electric-three-furnace switching device for induction furnaces. Background Technology

[0002] Induction furnace equipment is mainly divided into a power supply system and a furnace body system. The conventional configuration is a one-power-two-furnace mode, that is, one power supply system and two furnace bodies. One furnace body is used for normal operation, while the other furnace body is used for lining maintenance. This is determined by the operating process of induction furnaces. Because the furnace lining of induction furnaces is made of quartz sand or neutral furnace charge and is constructed using a dry ramming method, its lifespan is shorter than that of furnace linings constructed with bricks. Often, a single lining can only be used for 2-3 shifts before the lining must be rebuilt, and the relining process often takes 1-2 days. Therefore, the two furnace bodies are used in an alternating operation mode, with one furnace body in operation and the other used for lining maintenance.

[0003] For users, if they need to purchase two sets of induction furnace equipment, the conventional configuration requires two power supply systems and four furnace bodies. However, only two of the four furnace bodies are in operation, while the other two require offline lining and maintenance, resulting in a waste of investment. Utility Model Content

[0004] To improve switching efficiency and minimize the need for full line shutdown for maintenance, this application provides a two-electric-three-furnace switching device for induction furnaces.

[0005] The technical solution provided in this application for a two-electric-three-furnace furnace switching device for an induction furnace is as follows:

[0006] A two-electric-three-furnace switching device for an induction furnace includes a first furnace body, a second furnace body, a third furnace body, a hydraulic control system, an interconnecting bus, a first driving power supply, and a second driving power supply. The first furnace body includes a first switching switch, the second furnace body includes a second switching switch and a third switching switch, and the third furnace body includes a fourth switching switch. The second switching switch is located close to the first switching switch, and the third switching switch is located close to the fourth switching switch. The first, second, third, and fourth switching switches are all connected to the hydraulic control system. The voltage output terminal of the first driving power supply is electrically connected to the power supply terminal of the first switching switch, and the power supply terminal of the first switching switch is electrically connected to the power supply terminal of the second switching switch via the interconnecting bus. The voltage output terminal of the second driving power supply is electrically connected to the power supply terminal of the fourth switching switch, and the power supply terminal of the fourth switching switch is electrically connected to the power supply terminal of the third switching switch via the interconnecting bus.

[0007] By adopting the above technical solution, through the coordinated operation of the first and second drive power supplies and the hydraulic control system, combined with the flexible power distribution method of the interconnected bus, the switching and independent control of the first, second, and third furnace bodies can be realized. This allows the third furnace body to be powered off for maintenance when any two furnace bodies are working, improving switching efficiency and effectively solving the problem of requiring a complete shutdown for maintenance.

[0008] Preferably, when the first furnace body enters the maintenance state, the second driving power supply supplies power to the fourth and third circuit breakers, the first driving power supply supplies power to the second circuit breaker, and the first furnace body is de-energized; the hydraulic control system controls the fourth and second circuit breakers to close, and the first and third circuit breakers to open.

[0009] By adopting the above technical solution, when the first furnace body is maintained, the circuit of the first furnace body is isolated by switching off, while the second drive power supply directly supplies power to the third and fourth switching off, ensuring the continuous operation of the second and third furnace bodies and avoiding production interruption.

[0010] Preferably, when the second furnace body enters the maintenance state, the first driving power supply and the second driving power supply are respectively connected to the first furnace body and the third furnace body, and the second furnace body is de-energized; the hydraulic control system controls the first and fourth circuit breakers to close, and the second and third circuit breakers in the second furnace body to open.

[0011] By adopting the above technical solution, when the second furnace body is maintained, the first, third, and fourth furnace bodies are directly powered by an independent power source, ensuring the continuous operation of the first, third, and fourth furnace bodies.

[0012] Preferably, when the third furnace body enters the maintenance state, the first driving power supply supplies power to the first and second circuit breakers, the second driving power supply supplies power to the third circuit breaker, and the third furnace body is de-energized; the hydraulic control system controls the first and third circuit breakers to close, and the fourth and second circuit breakers to open.

[0013] By adopting the above technical solution, when the third furnace body is maintained, the circuit of the third furnace body is isolated by the circuit breaker, and at the same time the first driving power supply directly supplies power to the first circuit breaker and the second circuit breaker, so as to ensure the continuous operation of the first furnace body and the second furnace body and avoid production interruption.

[0014] Preferably, the hydraulic control system includes four cylinders, which are respectively connected to the drive ends of the first, second, third, and fourth circuit breakers.

[0015] By adopting the above technical solution, the opening and closing actions of the circuit breaker are driven by the hydraulic cylinder, and each circuit breaker is equipped with an independent hydraulic cylinder, which avoids the problems of insufficient pressure or delayed action when multiple circuit breakers share a single hydraulic cylinder.

[0016] Preferably, the hydraulic control system further includes a pressure sensor, which is located at the oil inlet and oil outlet of the cylinder and is connected to an external PLC signal.

[0017] By adopting the above technical solution, the pressure sensor monitors the pressure at the oil inlet / outlet of the cylinder, and the PLC provides real-time feedback on the hydraulic system status to prevent closing failure caused by oil circuit leakage or insufficient pressure, thus ensuring that the opening and closing actions of the circuit breaker are in place.

[0018] Preferably, the interconnecting busbar adopts a dual-path parallel copper busbar.

[0019] By adopting the above technical solution, when a single copper busbar fails, the other busbar can still temporarily maintain power supply.

[0020] Preferably, a current sensor is connected to the interconnecting bus.

[0021] By adopting the above technical solution, the current of the interconnecting bus can be detected in real time by setting a current sensor to prevent overload or short circuit.

[0022] In summary, this application includes at least one of the following beneficial technical effects: through the coordinated control of dual drive power supply and hydraulic control system, combined with the intelligent power distribution design of interconnected busbar, the third furnace body can be safely de-energized and enter maintenance state while any two furnace bodies are working normally, effectively solving the technical problem that traditional electric furnace systems must shut down the entire line during maintenance, and significantly improving production efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first furnace body entering the maintenance state in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the second furnace body entering the maintenance state in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the third furnace body entering the maintenance state in an embodiment of this application.

[0026] Reference numerals in the attached drawings: 1. First furnace body; 11. First circuit breaker; 2. Second furnace body; 21. Second circuit breaker; 22. Third circuit breaker; 3. Third furnace body; 31. Fourth circuit breaker; 4. First drive power supply; 5. Second drive power supply; 6. Interconnection bus. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0028] This application discloses a two-electric-three-furnace switching device for induction furnaces.

[0029] Reference Figure 1 A two-electric-three-furnace switching device for an induction furnace includes a first furnace body 1, a second furnace body 2, a third furnace body 3, a hydraulic control system, an interconnecting bus 6, a first drive power supply 4, and a second drive power supply 5. The first furnace body 1 and the third furnace body 3 are respectively located on opposite sides of the second furnace body 2. The first furnace body 1 includes a first switching gate 11, the second furnace body 2 includes a second switching gate 21 and a third switching gate 22, and the third furnace body 3 includes a fourth switching gate 31. The second switching gate 21 is located close to the first switching gate 11, and the third switching gate 22 is located close to the fourth switching gate 31. The first switching gate 11, the second switching gate 21, the third switching gate 22, and the fourth switching gate 31 are all connected to the hydraulic control system, and the switching on and off are achieved through the hydraulic system. This allows for flexible maintenance of the first furnace body 1, the second furnace body 2, and the third furnace body 3 during the operation of the induction furnace, improving the overall utilization rate.

[0030] The voltage output terminal of the first driving power supply 4 is electrically connected to the power supply terminal of the first switching circuit breaker 11, and the power supply terminal of the first switching circuit breaker 11 is electrically connected to the power supply terminal of the second switching circuit breaker 21 through the interconnecting bus 6; the voltage output terminal of the second driving power supply 5 is electrically connected to the power supply terminal of the fourth switching circuit breaker 31, and the power supply terminal of the fourth switching circuit breaker 31 is electrically connected to the power supply terminal of the third switching circuit breaker 22 through the interconnecting bus 6. The interconnecting bus 6 adopts a dual-circuit parallel copper busbar, which automatically switches to the backup circuit when one circuit fails. Preferably, a current sensor can also be connected to the interconnecting bus 6, so that the on / off status of the busbar can be monitored through the current sensor.

[0031] The hydraulic control system includes a hydraulic pump station, pressure sensors, and four hydraulic cylinders. These cylinders are connected to the drive ends of the first opening / closing switch 11, the second opening / closing switch 21, the third opening / closing switch 22, and the fourth opening / closing switch 31, respectively, to achieve multiple opening and closing actions. In this embodiment, the cylinders are double-acting hydraulic cylinders, and the piston rod is extended or retracted by an electromagnetic directional valve, thereby driving the closing / opening actions of the switches. Pressure sensors are installed at the oil inlet and outlet of the cylinders and are connected to an external PLC signal. The pressure sensors are used to collect the system pressure value and upload it to the external PLC, thereby determining whether the opening and closing actions are complete.

[0032] Reference Figure 1When the first furnace body 1 enters the maintenance state, the second drive power supply 5 supplies power to the fourth switch 31 and the third switch 22, and the first drive power supply 4 supplies power to the second switch 21. The first furnace body 1 is de-energized for furnace maintenance. The hydraulic control system controls the fourth switch 31 and the second switch 21 to close, and the first switch 11 and the third switch 22 to open.

[0033] Reference Figure 2 When the second furnace body 2 enters the maintenance state, the first drive power supply 4 and the second drive power supply 5 are respectively connected to the first furnace body 1 and the third furnace body 3, so that the first switch 11 and the fourth switch 31 work simultaneously, and the second furnace body 2 is de-energized so that furnace lining maintenance can be performed; the hydraulic control system controls the first switch 11 and the fourth switch 31 to close, and the second switch 21 and the third switch 22 in the second furnace body 2 to open.

[0034] Reference Figure 3 When the third furnace body 3 enters the maintenance state, the first drive power supply 4 supplies power to the first switch 11 and the second switch 21, and the second drive power supply 5 supplies power to the third switch 22. The third furnace body 3 is de-energized for furnace maintenance. The hydraulic control system controls the first switch 11 and the third switch 22 to close, and the fourth switch 31 and the second switch 21 to open.

[0035] In addition, this device is equipped with a control interlocking mechanism. When the status of multiple opening and closing circuit breakers matches the different maintenance statuses of the induction furnace, the hydraulic control system can drive the corresponding furnace body into use to ensure the safety and practicality of the equipment.

[0036] The implementation principle of the two-power-three-furnace switching device for induction furnaces in this application embodiment is as follows: through the coordinated cooperation of the first driving power supply 4 and the second driving power supply 5 with the hydraulic control system, combined with the flexible power distribution method of the interconnecting bus 6, the intelligent switching and independent control of the three furnace bodies (first furnace body 1, second furnace body 2, and third furnace body 3) driven by the two power supplies are realized. This allows the third furnace body to be powered off for maintenance when any two furnace bodies are working, effectively solving the technical problems of low switching efficiency and the need for a complete shutdown for maintenance in traditional systems.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A two-electric-three-furnace switching device for an induction furnace, characterized in that: The system includes a first furnace body (1), a second furnace body (2), a third furnace body (3), a hydraulic control system, an interconnecting bus (6), a first drive power supply (4), and a second drive power supply (5). The first furnace body (1) includes a first switch (11), the second furnace body (2) includes a second switch (21) and a third switch (22), and the third furnace body (3) includes a fourth switch (31). The second switch (21) is located close to the first switch (11), and the third switch (22) is located close to the fourth switch (31). The first switch (11), the second switch (21), the third switch (22), and the fourth switch (31) are all connected to the hydraulic control system. The voltage output terminal of the first driving power supply (4) is electrically connected to the power supply terminal of the first opening and closing circuit breaker (11), and the power supply terminal of the first opening and closing circuit breaker (11) is electrically connected to the power supply terminal of the second opening and closing circuit breaker (21) through the interconnection bus (6); the voltage output terminal of the second driving power supply (5) is electrically connected to the power supply terminal of the fourth opening and closing circuit breaker (31), and the power supply terminal of the fourth opening and closing circuit breaker (31) is electrically connected to the power supply terminal of the third opening and closing circuit breaker (22) through the interconnection bus (6).

2. The two-electric-three-furnace switching device for an induction furnace according to claim 1, characterized in that: When the first furnace body (1) enters the maintenance state, the second drive power supply (5) supplies power to the fourth circuit breaker (31) and the third circuit breaker (22), the first drive power supply (4) supplies power to the second circuit breaker (21), and the first furnace body (1) is de-energized; the hydraulic control system controls the fourth circuit breaker (31) and the second circuit breaker (21) to close, and the first circuit breaker (11) and the third circuit breaker (22) to open.

3. A two-electric-three-furnace switching device for an induction furnace according to claim 2, characterized in that: When the second furnace body (2) enters the maintenance state, the first drive power supply (4) and the second drive power supply (5) are respectively connected to the first furnace body (1) and the third furnace body (3), and the second furnace body (2) is de-energized; the hydraulic control system controls the first circuit breaker (11) and the fourth circuit breaker (31) to close, and the second circuit breaker (21) and the third circuit breaker (22) in the second furnace body (2) to open.

4. A two-electric-three-furnace switching device for an induction furnace according to claim 1, characterized in that: When the third furnace body (3) enters the maintenance state, the first driving power supply (4) supplies power to the first circuit breaker (11) and the second circuit breaker (21), the second driving power supply (5) supplies power to the third circuit breaker (22), and the third furnace body (3) is de-energized; the hydraulic control system controls the first circuit breaker (11) and the third circuit breaker (22) to close, and the fourth circuit breaker (31) and the second circuit breaker (21) to open.

5. A two-electric-three-furnace switching device for an induction furnace according to claim 1, characterized in that: The hydraulic control system includes four cylinders, which are respectively connected to the drive ends of the first opening and closing gate (11), the second opening and closing gate (21), the third opening and closing gate (22) and the fourth opening and closing gate (31).

6. A two-electric-three-furnace switching device for an induction furnace according to claim 5, characterized in that: The hydraulic control system also includes a pressure sensor, which is located at the oil inlet and oil outlet of the cylinder and is connected to an external PLC signal.

7. A two-electric-three-furnace switching device for an induction furnace according to claim 1, characterized in that: The interconnecting busbar (6) adopts a dual-path parallel copper busbar.

8. A two-electric-three-furnace switching device for an induction furnace according to claim 1, characterized in that: A current sensor is connected to the interconnect bus (6).

Images