A control system for safe tapping of molten iron car

Abstract

The present application relates to a kind of iron car safety iron release control system, belong to metallurgical vehicle electrical control field.The scheme is based on the parking of travel limit control in the process that iron car travels along track, multiple relays are set to signal interlocking, to be received iron position control relay as the electrical interlocking signal of sending iron release signal, to be received iron position control relay as the electrical interlocking signal of iron position locking, to be received iron position control relay and iron release signal control relay as the electrical interlocking signal of iron position unlocking, by the association of iron release signal and iron car in the locking and unlocking of iron position, and the signal of locking and unlocking is associated with the advance and retreat control of iron car, prevent the action of iron car in the process of receiving iron by the mode of electrical control signal block, eliminate the misoperation and cause the misoperation of iron car in the process of receiving iron due to abnormal reasons, improve the stability and safety of iron car iron release control.

Description

Technical Field

[0001] This invention belongs to the field of electrical control and relates to the electrical control of the iron discharge process of metallurgical vehicles. Background Technology

[0002] A molten iron car is a special-purpose transport vehicle used to transport molten iron at a temperature of 1500℃ to steel mills, foundries, and casting plants for steelmaking, casting iron blocks, or casting steel ingot molds. Currently, the molten iron car stops at the iron-receiving position limit switch on its track. After the stop signal is confirmed, the operator sends an iron-receiving signal. Once the blast furnace confirms that the conditions are met, iron receiving begins. At this point, an iron-receiving signal is sent to the molten iron car for operation, and the taphole is opened to allow the molten iron car to receive the iron.

[0003] However, the above control method has significant safety hazards. Since the travel limit of the iron receiving position does not directly stop the movement of the molten iron car, the molten iron car is in a movable state. If the molten iron car is moved by mistake while receiving iron, it will cause the hot molten iron to spill, resulting in a serious accident that burns the molten iron car and cables. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a control system for the safe discharge of molten iron from a molten iron car, which prevents the molten iron car from being misoperated from the perspective of blocking control signals, avoids the molten iron car from moving due to control problems and causing safety accidents, and improves the safety of molten iron discharge from the molten iron car.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A control system for the safe discharge of molten iron from a molten iron car includes a molten iron position limit switch, a molten iron position control relay, a discharge signal control relay, a discharge signal trigger switch, a selector switch, a molten iron position locking control relay, a molten iron position unlocking control relay, a forward control relay, a reverse control relay, a forward start button, a reverse start button, and a travel stop button.

[0007] The iron-loaded position limit switch is connected to the main circuit through the iron-loaded position control relay to form an iron-loaded position circuit;

[0008] The iron release signal control relay is connected to the main circuit through the iron release signal trigger switch to form an iron release signal loop; the first set of normally open contacts of the iron receiving position control relay are connected in series in the iron release signal loop.

[0009] The iron position locking control relay is connected to the main circuit through a selector switch to form an iron position locking circuit; the iron position locking circuit is connected in series to the second set of normally open contacts of the iron position control relay.

[0010] The iron-loaded position unlocking control relay is connected to the main circuit through another position of the selector switch to form an iron-loaded position unlocking circuit; the iron-loaded position unlocking circuit is connected in series to the first set of normally closed contacts of the iron-loaded position control relay, and the third set of normally open contacts of the iron-loaded position control relay is connected in series with the first set of normally open contacts of the iron-release signal control relay and then connected in parallel across the first set of normally closed contacts of the iron-loaded position control relay.

[0011] The forward control relay is connected in series with the first forward logic control circuit and the forward start button to form a forward circuit; the reverse control relay is connected in series with the first reverse logic control circuit and the reverse start button to form a reverse circuit; the forward circuit and the reverse circuit are respectively connected in series to the main circuit through the driving stop button.

[0012] A second forward logic control circuit is connected in parallel across the first forward logic control circuit; the first forward logic control circuit is connected in series with the first set of normally closed contacts of the retraction control relay, the first set of normally closed contacts of the iron-loaded position locking control relay, the second set of normally closed contacts of the iron-loaded signal control relay, and the second set of normally closed contacts of the iron-loaded position control relay; the second forward logic control circuit is connected in series with the second set of normally closed contacts of the retraction control relay, the first set of normally open contacts of the iron-loaded position unlocking control relay, and the fourth set of normally open contacts of the iron-loaded position control relay; the first set of normally open contacts of the forward control relay is connected in parallel across the forward start button;

[0013] A second backward logic control circuit is connected in parallel across the two ends of the first backward logic control circuit; the first backward logic control circuit is connected in series with the first set of normally closed contacts of the forward control relay, the second set of normally closed contacts of the iron position locking control relay, the third set of normally closed contacts of the iron release signal control relay, and the third set of normally closed contacts of the iron position control relay; the second backward logic control circuit is connected in series with the second set of normally closed contacts of the forward control relay, the second set of normally open contacts of the iron position unlocking control relay, and the fifth set of normally open contacts of the iron position control relay; the first set of normally open contacts of the backward control relay is connected in parallel across the two ends of the backward start button.

[0014] Furthermore, the discharge signal trigger switch includes a discharge signal start button and a discharge signal stop button connected in series. A set of normally open contacts of a discharge signal control relay are connected in parallel across the two ends of the discharge signal start button. This design sets the switch operation to be controlled by two separate buttons, and uses the relay's self-locking mechanism to maintain the start signal, reducing the possibility of erroneous discharge signal switching and improving the reliability and stability of the equipment.

[0015] Furthermore, an emergency stop switch is connected in series between the driving stop button and the main circuit. This solution includes an emergency stop switch, which adds a layer of safety by quickly disconnecting the circuit in case of a failure of the basic control logic, thereby shielding the forward or reverse control signals, preventing misoperation, and improving control safety.

[0016] Furthermore, the forward and reverse circuits are connected in parallel and then connected in series to the main circuit via a driving stop button. This solution controls the on / off state of both the forward and reverse circuits simultaneously with a single master stop button, reducing control complexity and equipment costs.

[0017] The beneficial effects of this invention are as follows:

[0018] This scheme uses the activation of the iron receiving position control relay as the electrical interlock signal for issuing the iron release signal, the activation of the iron receiving position control relay as the electrical interlock signal for locking the iron receiving position, and the activation of the iron receiving position control relay and the deactivation of the iron release signal control relay as the electrical interlock signal for unlocking the iron receiving position. By associating the iron release signal with the locking and unlocking of the molten iron car in the iron receiving position, and associating the locking and unlocking signals with the forward and reverse control of the molten iron car, this scheme uses electrical control signal blocking to prevent the molten iron car from moving during the iron receiving process. This eliminates malfunctions caused by misoperation or other abnormal reasons, thus improving the stability and safety of the iron release control of the molten iron car.

[0019] Compared to using a limiting device to completely block the movement of the molten iron car on the track, this solution does not require a complex and high-load-bearing limiting device, nor does it require the installation and removal of the limiting device before and after receiving iron. It has low hardware costs, and the electrical control is simple to operate and quick to respond, avoiding the impact of iron discharge efficiency on the overall production efficiency.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a circuit diagram of a control system for the safe discharge of molten iron from a molten iron car according to the present invention.

[0023] Reference numerals: SQ1 - Iron-loaded position limit switch, K16 - Iron-loaded position control relay, ST1 - Iron-loaded signal stop button, SB1 - Iron-loaded signal start button, K30 - Iron-loaded signal control relay, 2SA1 - Iron-loaded position lock selection position, 2SA2 - Iron-loaded position unlock selection position, 2K1 - Iron-loaded position lock control relay, 2K2 - Iron-loaded position unlock control relay, 2SE1 - Emergency stop switch, 2ST1 - Travel stop button, 2SB1 - Forward start button, 2SB2 - Reverse start button, K1A - Forward control relay, K2A - Reverse control relay. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Please see Figure 1This is a control system for the safe discharge of molten iron from a molten iron car, comprising a molten iron position limit switch SQ1, a molten iron position control relay K16, a discharge signal control relay K30, a discharge signal trigger switch, a selector switch, a molten iron position locking control relay 2K1, a molten iron position unlocking control relay 2K2, a forward control relay K1A, a reverse control relay K2A, a forward start button 2SB1, a reverse start button 2SB2, and a travel stop button 2ST1. In this embodiment, the discharge signal trigger switch includes a discharge signal start button SB1 and a discharge signal stop button ST1.

[0028] The iron-loaded position limit switch SQ is connected to the main circuit (i.e., the circuit connected between the neutral wire and the live wire) through the iron-loaded position control relay K16, forming an iron-loaded position circuit;

[0029] The iron release signal control relay K30 is connected to the main circuit through an iron release signal start button SB1 and an iron release signal stop button ST1 connected in series. A set of normally open contacts of the iron release signal control relay K30 is connected in parallel across the two ends of the iron release signal start button SB1 to form an iron release signal circuit. The first set of normally open contacts of the iron receiving position control relay K16 is connected in series in the iron release signal circuit. In this embodiment, this set of normally open contacts (the first set of normally open contacts of the iron receiving position control relay K16; here, "first" does not represent a specific order and is only used as a number to distinguish different contacts; any set of normally open contacts of the iron receiving position control relay K16 can be used, and the same applies below) is connected between the iron release signal start button SB1 and the iron release signal stop button ST1.

[0030] The iron position locking control relay SK1 is connected to the main circuit through one position of the selector switch (i.e., iron position locking selection position 2SA1) to form an iron position locking circuit; the iron position locking circuit is connected in series to the second set of normally open contacts of the iron position control relay K16.

[0031] The iron-loaded position unlocking control relay SK2 is connected to the main circuit through another position of the selector switch (i.e., iron-loaded position unlocking selection position 2SA2) to form an iron-loaded position unlocking circuit; the iron-loaded position unlocking circuit is connected in series to the first set of normally closed contacts of the iron-loaded position control relay K16, and the third set of normally open contacts of the iron-loaded position control relay K16 is connected in series with the first set of normally open contacts of the iron-release signal control relay K30 and then connected in parallel across the first set of normally closed contacts of the iron-loaded position control relay K16;

[0032] The forward control relay K1A is connected in series with the first forward logic control circuit and the forward start button 2SB1 to form a forward circuit; the reverse control relay K2A is connected in series with the first reverse logic control circuit and the reverse start button 2SB2 to form a reverse circuit; the forward circuit and the reverse circuit are connected in parallel and then connected in series with the main circuit through the driving stop button 2ST1.

[0033] A second forward logic control circuit is connected in parallel across the first forward logic control circuit. The first forward logic control circuit is connected in series with the first set of normally closed contacts of the retraction control relay K2A, the first set of normally closed contacts of the iron-loaded position locking control relay 2K1, the second set of normally closed contacts of the iron-loaded signal control relay K30, and the second set of normally closed contacts of the iron-loaded position control relay K16. The second forward logic control circuit is connected in series with the second set of normally closed contacts of the retraction control relay K2A, the first set of normally open contacts of the iron-loaded position unlocking control relay 2K2, and the fourth set of normally open contacts of the iron-loaded position control relay K16. The first set of normally open contacts of the forward control relay K1A is connected in parallel across the two ends of the forward start button 2SB1.

[0034] A second backward logic control circuit is connected in parallel across the two ends of the first backward logic control circuit; the first backward logic control circuit is connected in series with the first set of normally closed contacts of the forward control relay K1A, the second set of normally closed contacts of the iron position locking control relay 2KA, the third set of normally closed contacts of the iron release signal control relay K30, and the third set of normally closed contacts of the iron position control relay K16; the second backward logic control circuit is connected in series with the second set of normally closed contacts of the forward control relay K1A, the second set of normally open contacts of the iron position unlocking control relay 2K2, and the fifth set of normally open contacts of the iron position control relay K16; the first set of normally open contacts of the backward control relay K2A is connected in parallel across the two ends of the backward start button 2SB2.

[0035] Working principle:

[0036] When the molten iron car is in the receiving position, K16 is energized, and its normally open auxiliary contact closes. When the selector switch is in position 2SA1, the molten iron car is locked and cannot move forward or backward. After the molten iron is discharged, the discharge signal is cut off, K30 is de-energized, and its normally closed auxiliary contact closes. When the selector switch is in position 2SA2, the molten iron car is unlocked, 2K2 is energized, and its normally open auxiliary contact closes. Before the limit switch is opened, the receiving position control relay K16 is still energized, allowing the car to move forward or backward. When the car leaves the receiving limit position, K16 is de-energized, and its normally closed auxiliary contact closes. 2K1 is also de-energized at this time, and its normally closed auxiliary contact closes, allowing the molten iron car to move forward or backward. Through the interlocking of the molten iron discharge signal, the molten iron car is prevented from moving while receiving iron.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control system for the safe discharge of molten iron from a molten iron car, characterized in that: It includes a limit switch for the iron receiving position, an iron receiving position control relay, an iron release signal control relay, an iron release signal trigger switch, a selector switch, an iron receiving position locking control relay, an iron receiving position unlocking control relay, a forward control relay, a reverse control relay, a forward start button, a reverse start button, and a driving stop button; The iron-loaded position limit switch is connected to the main circuit through the iron-loaded position control relay to form an iron-loaded position circuit; The iron release signal control relay is connected to the main circuit through the iron release signal trigger switch to form an iron release signal loop; the first set of normally open contacts of the iron receiving position control relay is connected in series in the iron release signal loop; the iron release signal trigger switch includes an iron release signal start button and an iron release signal stop button connected in series, and a set of normally open contacts of the iron release signal control relay are connected in parallel across the two ends of the iron release signal start button. The iron position locking control relay is connected to the main circuit through a selector switch to form an iron position locking circuit; the iron position locking circuit is connected in series to the second set of normally open contacts of the iron position control relay. The iron-loaded position unlocking control relay is connected to the main circuit through another position of the selector switch to form an iron-loaded position unlocking circuit; the iron-loaded position unlocking circuit is connected in series to the first set of normally closed contacts of the iron-loaded position control relay, and the third set of normally open contacts of the iron-loaded position control relay is connected in series with the first set of normally open contacts of the iron-release signal control relay and then connected in parallel across the first set of normally closed contacts of the iron-loaded position control relay. The forward control relay is connected in series with the first forward logic control circuit and the forward start button to form a forward circuit; the backward control relay is connected in series with the first backward logic control circuit and the backward start button to form a backward circuit. The forward and reverse circuits are connected in series to the main circuit via a driving stop button. A second forward logic control circuit is connected in parallel across the first forward logic control circuit; the first forward logic control circuit is connected in series with the first set of normally closed contacts of the retraction control relay, the first set of normally closed contacts of the iron-loaded position locking control relay, the second set of normally closed contacts of the iron-loaded signal control relay, and the second set of normally closed contacts of the iron-loaded position control relay; the second forward logic control circuit is connected in series with the second set of normally closed contacts of the retraction control relay, the first set of normally open contacts of the iron-loaded position unlocking control relay, and the fourth set of normally open contacts of the iron-loaded position control relay; the first set of normally open contacts of the forward control relay is connected in parallel across the forward start button; A second backward logic control circuit is connected in parallel across the two ends of the first backward logic control circuit; the first backward logic control circuit is connected in series with the first set of normally closed contacts of the forward control relay, the second set of normally closed contacts of the iron position locking control relay, the third set of normally closed contacts of the iron release signal control relay, and the third set of normally closed contacts of the iron position control relay; the second backward logic control circuit is connected in series with the second set of normally closed contacts of the forward control relay, the second set of normally open contacts of the iron position unlocking control relay, and the fifth set of normally open contacts of the iron position control relay; the first set of normally open contacts of the backward control relay is connected in parallel across the two ends of the backward start button.

2. The control system for safe iron discharge from a molten iron car according to claim 1, characterized in that: An emergency stop switch is also connected in series between the driving stop button and the main circuit.

3. The control system for safe iron discharge from a molten iron car according to claim 2, characterized in that: The forward and reverse circuits are connected in parallel and then connected in series to the main circuit via a driving stop button.

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