A limiting mechanism for high-temperature area of a ladle capping of a refining furnace

Abstract

This utility model provides a limiting mechanism for the high-temperature zone of a ladle cover in a refining furnace. It includes a motor control circuit comprising a three-phase AC power supply, a frequency converter, a ladle cover drive motor, push-button switches, and intermediate relays. The push-button switches include SB2 and SB3, and the intermediate relays include KA1, KA2, KA3, and KA4. It also includes two insulators disposed on opposite sides of the driven gear of the ladle cover mechanism, each with a first conductor. A second conductor is disposed on the column of the ladle cover mechanism. The driving gear, meshing with the driven gear, can contact the two first conductors respectively. A normally closed contact of KA3 is connected in series with the coil of KA1, and a normally closed contact of KA4 is connected in series with the coil of KA2. The two first conductors are connected in series with the coils of KA3 and KA4 respectively and then connected to the positive terminal of a 24V DC power supply. The two second conductors are connected to the negative terminal of a 24V DC power supply. This mechanism replaces traditional proximity switches, is resistant to high temperatures and less prone to damage, reducing cost losses.

Description

Technical Field

[0001] This utility model belongs to the field of limiting mechanisms, specifically relating to a limiting mechanism for covering the high-temperature area of ​​a steel ladle in a refining furnace. Background Technology

[0002] The steelmaking refining furnace consists of charging, electrode adjustment, water cooling, hydraulic control, ladle car, ladle cover, and dust removal systems. The ladle car and ladle cover mechanism have two positions: #1 and #2. The ladle cover limit switch is located at the ladle car lifting position. When the ladle is in the lifting position, the temperature can reach over 600 degrees Celsius. Prolonged exposure to this high temperature can damage the ladle mechanism, causing it to malfunction. This often results in the ladle being unable to be covered, leading to low molten steel temperatures on the continuous casting machine and casting machine shutdowns. Furthermore, frequent replacement of limit switches increases costs. Summary of the Invention

[0003] This utility model solves the above-mentioned technical problems by providing a limiting mechanism for the high-temperature zone of a ladle cover in a refining furnace. The specific solution is as follows:

[0004] A limiting mechanism for the high-temperature zone of a ladle cover in a refining furnace includes a motor control circuit. The motor control circuit includes a three-phase AC power supply, a frequency converter, a ladle cover drive motor, push-button switches, and intermediate relays. The three-phase AC power supply is connected to the frequency converter, which is connected to the drive motor. The push-button switches include SB2 and SB3. The intermediate relays include KA1, KA2, KA3, and KA4. The normally open contacts of SB2 and KA1 are connected in parallel to two phases of the AC power supply and the KA1 coil. The normally open contacts of SB3 and KA2 are connected in parallel to two phases of the AC power supply and the KA2 coil. The control line for the forward rotation of the frequency converter... The circuit is connected to the normally open contact of KA1, and the control circuit for reversing the frequency converter is connected to the normally open contact of KA2. It also includes two insulators on opposite sides of the driven gear of the ladle covering mechanism. Each of the two insulators has a first conductor. The column of the ladle covering mechanism has a second conductor. The driving gear that meshes with the driven gear can contact the two first conductors respectively. The KA1 coil is connected in series with the normally closed contact of KA3, and the KA2 coil is connected in series with the normally closed contact of KA4. The two first conductors are connected in series with the KA3 coil and the KA4 coil respectively and then connected to the positive terminal of the 24V DC power supply. The two second conductors are connected to the negative terminal of the 24V DC power supply.

[0005] Furthermore, the 24V DC power supply includes a step-down transformer, wherein the high-voltage side of the step-down transformer is connected to a two-phase AC power supply and the low-voltage side is connected to a rectifier module.

[0006] Furthermore, a two-phase circuit breaker is also installed between the step-down transformer and the two-phase AC power supply.

[0007] Furthermore, a fuse is connected to the live wire between the two-phase circuit breaker and the step-down transformer.

[0008] Furthermore, a 1A single-pole circuit breaker is also installed at the positive terminal of the 24V DC power supply.

[0009] Furthermore, a motor power protection switch is installed between the three-phase AC power supply and the frequency converter.

[0010] Furthermore, a push-button switch SB1 is provided between SB2 and SB3 and the two-phase AC power supply.

[0011] Furthermore, the first conductor is a steel rope, which is mounted on an installation component. The installation component is mounted on a fixed block, which is fixedly connected to an insulator.

[0012] Furthermore, the mounting component is a proximity switch with an axially open hole, the steel rope is disposed inside the through hole, and an insulating layer is provided between the steel rope and the through hole.

[0013] The beneficial effects of this utility model are:

[0014] This utility model discloses a limiting mechanism for the high-temperature zone of a ladle cover in a refining furnace. It forms a safety circuit by setting two first conductors, two intermediate relay coils KA3 and KA4, and a second conductor. When the drive gear rotates to the working position or the waiting position, it contacts one of the first conductors to form a circuit. The motor control circuit is disconnected and the motor stops, thus achieving the limiting. It replaces the traditional proximity switch, is resistant to high temperatures and is not easily damaged, reducing cost losses. Attached Figure Description

[0015] Figure 1 Original circuit diagram for adding a limit switch to cover the ladle of the refining furnace.

[0016] Figure 2 and Figure 3 This is a safety circuit diagram for the limit mechanism of this utility model.

[0017] Figure 4 This is a schematic diagram of the limiting mechanism of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Passive gear; 2. First conductor; 3. Column; 4. Driving gear; 5. Mounting component; 6. Fixing block. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] See Figure 1-4A limiting mechanism for the high-temperature zone of a ladle cover in a refining furnace includes a motor control circuit. The motor control circuit includes a three-phase AC power supply, a frequency converter, a ladle cover drive motor, push-button switches, and intermediate relays. The three-phase AC power supply is connected to the frequency converter, which is connected to the drive motor. The push-button switches include SB2 and SB3. The intermediate relays include KA1, KA2, KA3, and KA4. SB2 and KA1 normally open contacts are connected in parallel to two phases of the AC power supply and the KA1 coil. SB3 and KA2 normally open contacts are connected in parallel to two phases of the AC power supply and the KA2 coil. The control circuit for the forward rotation of the frequency converter is connected to K... The A1 normally open contact is connected, and the inverter reversal control circuit is connected to the KA2 normally open contact. It also includes two insulators set on opposite sides of the passive gear 1 of the ladle covering mechanism. The two insulators are respectively provided with a first conductor 2, and the column 3 of the ladle covering mechanism is provided with a second conductor. The driving gear 4 that meshes with the passive gear 1 can contact the two first conductors 2 respectively. The KA1 coil is connected in series with the KA3 normally closed contact, and the KA2 coil is connected in series with the KA4 normally closed contact. The two first conductors 2 are connected in series with the KA3 coil and the KA4 coil respectively and then connected to the positive terminal of the 24V DC power supply. The two second conductors are connected to the negative terminal of the 24V DC power supply.

[0021] The preferred 24V DC power supply includes a step-down transformer, with the high-voltage side of the step-down transformer connected to a two-phase AC power supply and the low-voltage side connected to a rectifier module.

[0022] A two-phase circuit breaker is also installed between the preferred step-down transformer and the two-phase AC power supply.

[0023] A fuse is connected to the live wire between the preferred two-phase circuit breaker and the step-down transformer. When a short circuit occurs in the line, the fuse protects the circuit.

[0024] The preferred 24V DC power supply is also equipped with a 1A single-pole circuit breaker at the positive terminal to prevent short-circuit current from damaging the power supply.

[0025] A motor power protection switch is preferably installed between the preferred three-phase AC power supply and the frequency converter.

[0026] A push-button switch SB1 is preferably provided between SB2 and SB3 and the two-phase AC power supply.

[0027] The preferred first conductor 2 is a steel rope, which is installed on the mounting component 5. The mounting component 5 is set on a fixing block 6, which is fixed to the insulator. Since the first conductor 2 is set as a steel rope component, the steel rope is flexible. When the drive gear 4 rotates and comes into contact with the steel rope, even if the drive gear 4 does not stop immediately due to poor contact, it will not damage the steel rope.

[0028] The preferred mounting component 5 is a proximity switch with an axially open hole, in which a steel rope is placed and an insulating layer is provided between the steel rope and the through hole.

[0029] The working principle of this invention is as follows: When removing or adding a lid, pressing the SB2 forward rotation button closes relay KA1, and the open contact of KA1 remains closed and holds. The frequency converter receives the forward rotation signal and outputs a 25Hz frequency (adjusting the output speed of the frequency converter according to the production rhythm) to the motor, driving the rotating arm to rotate from the waiting position SQ2 to the working position. When it touches the working position SQ1, relay KA3 closes, the DC24V circuit is connected, the closed contact of KA3 opens, and the rotation stops. After removing or adding a lid, pressing the SB3 reverse rotation button closes relay KA2, and the open contact of KA2 remains closed and holds. The frequency converter receives the reverse rotation signal and outputs a 25Hz frequency (adjusting the output speed of the frequency converter according to the production rhythm) to the motor, driving the rotating arm to rotate from the working position SQ1 to the waiting position. When it touches the waiting position SQ2, relay KA4 closes, the DC24V circuit is connected, the closed contact of KA4 opens, and the rotation stops.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] 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 limiting mechanism for the high-temperature zone of a ladle cover in a refining furnace, comprising a motor control circuit, the motor control circuit including a three-phase AC power supply, a frequency converter, a ladle cover drive motor, push-button switches, and intermediate relays; the three-phase AC power supply is connected to the frequency converter, the frequency converter is connected to the drive motor; the push-button switches include SB2 and SB3; the intermediate relays include KA1, KA2, KA3, and KA4; SB2 and KA1 normally open contacts are connected in parallel to two phases of the AC power supply and the KA1 coil; SB3 and KA2 normally open contacts are connected in parallel to two phases of the AC power supply and the KA2 coil; the control circuit for forward rotation of the frequency converter is connected to the normally open contact of KA1; the control circuit for reverse rotation of the frequency converter is connected to the normally open contact of KA2, characterized in that: It also includes two insulators on opposite sides of the passive gear (1) of the ladle covering mechanism. The two insulators are respectively provided with a first conductor (2). The column (3) of the ladle covering mechanism is provided with a second conductor. The driving gear (4) that meshes with the passive gear (1) can contact the two first conductors (2) respectively. The KA1 coil is connected in series with the KA3 normally closed contact, and the KA2 coil is connected in series with the KA4 normally closed contact. The two first conductors (2) are connected in series with the KA3 coil and the KA4 coil respectively and then connected to the positive terminal of the 24V DC power supply. The two second conductors are connected to the negative terminal of the 24V DC power supply.

2. The limiting mechanism for covering the high-temperature zone of a steel ladle in a refining furnace according to claim 1, characterized in that: The 24V DC power supply includes a step-down transformer, with the high-voltage side of the step-down transformer connected to a two-phase AC power supply and the low-voltage side connected to a rectifier module.

3. A limiting mechanism for covering the high-temperature zone of a refining furnace ladle according to claim 2, characterized in that: A two-phase circuit breaker is also installed between the step-down transformer and the two-phase AC power supply.

4. A limiting mechanism for covering the high-temperature zone of a refining furnace ladle according to claim 3, characterized in that: A fuse is connected to the live wire between the two-phase circuit breaker and the step-down transformer.

5. A limiting mechanism for covering the high-temperature zone of a steel ladle in a refining furnace according to claim 1, characterized in that: The positive terminal of the 24V DC power supply is also equipped with a 1A single-pole circuit breaker.

6. A limiting mechanism for covering the high-temperature zone of a ladle in a refining furnace according to claim 1, characterized in that: A motor power protection switch is installed between the three-phase AC power supply and the frequency converter.

7. A limiting mechanism for covering the high-temperature zone of a ladle in a refining furnace according to claim 1, characterized in that: A push-button switch SB1 is provided between SB2 and SB3 and the two-phase AC power supply.

8. A limiting mechanism for covering the high-temperature zone of a steel ladle in a refining furnace according to claim 1, characterized in that: The first conductor (2) is a steel rope, which is installed on the mounting part (5). The mounting part (5) is set on a fixing block (6), which is fixed to the insulator.

9. A limiting mechanism for covering the high-temperature zone of a refining furnace ladle according to claim 8, characterized in that: The mounting component (5) is a proximity switch with an axially open hole. The steel rope is placed inside the through hole, and an insulating layer is provided between the steel rope and the through hole.

Images