A control system for preventing the converter oxygen lance from toppling during the lifting process

Abstract

This invention relates to a control system for preventing oxygen lance overshooting accidents during converter oxygen lance raising and lowering, belonging to the field of converter oxygen lance electrical control. This solution uses a limit switch in the oxygen setting, in conjunction with a relay, to form an abnormal protection circuit for high-speed oxygen lance operation. When the emergency lance raising command is mistakenly triggered due to human error or abnormal feedback from the external encoder, the system automatically cuts off the signal transmission channel for the oxygen lance raising and lowering to the frequency converter, preventing oxygen lance overshooting accidents and improving the safety and stability of the converter oxygen lance raising and lowering control system.

Description

Technical Field

[0001] This invention belongs to the field of converter oxygen lance electrical control and relates to the safety protection of converter oxygen lance electrical control system. Background Technology

[0002] Currently, the oxygen lance in converters is controlled via a central HMI (Human Machine Interface) for raising and lowering. The operator selects the operating location via a location selection switch on the central control panel, and then controls the lance's raising and lowering motion through the HMI. However, this existing control method has significant drawbacks. During the raising and lowering process, human error or abnormal feedback from the external encoder can easily trigger an emergency lance raising command, leading to high-speed operation of the lance and potentially causing serious accidents such as lance overshooting, posing a significant safety hazard. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a control system to prevent the oxygen lance from overshooting during the raising and lowering process of the converter oxygen lance, and to solve the problem of the emergency lifting command being triggered when the oxygen lance is misoperated due to human error or abnormal feedback value from the external encoder, so as to avoid the occurrence of the oxygen lance overshooting accident.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A control system for preventing top-rush accidents during the raising and lowering of a converter oxygen lance includes an oxygen lance raising and lowering frequency converter, and also includes a first oxygen lance upper limit position counterweight travel switch, a second oxygen lance upper limit position counterweight travel switch, an oxygen lance lower limit position counterweight travel switch, a first oxygen lance upper limit position relay, a second oxygen lance upper limit position relay, an oxygen lance lower limit position relay, and an oxygen lance emergency stop relay.

[0006] The upper limit switch of the first oxygen lance and the upper limit relay of the first oxygen lance are connected in series between the neutral wire and the live wire; the upper limit switch of the second oxygen lance and the upper limit relay of the second oxygen lance are connected in series between the neutral wire and the live wire; the lower limit switch of the oxygen lance and the lower limit relay of the oxygen lance are connected in series between the neutral wire and the live wire.

[0007] The oxygen lance emergency stop relay, the normally closed contact of the oxygen lance lower limit relay, the normally closed contact of the first oxygen lance upper limit relay, and the normally closed contact of the second oxygen lance upper limit relay are connected in series to form an oxygen lance emergency stop circuit. The oxygen lance emergency stop circuit is connected between the neutral wire and the live wire. The normally open contact of the oxygen lance emergency stop relay is connected to the oxygen lance lifting frequency converter.

[0008] Furthermore, the oxygen lance emergency stop circuit is also connected in series with a normally closed emergency stop button on the platform's on-site control box. This solution adds a manual emergency stop measure, enabling an emergency stop in case of automatic control malfunctions, thus increasing the system's safety and stability.

[0009] Furthermore, the emergency stop buttons in the platform's on-site control box include emergency stop buttons for the 20-meter platform and emergency stop buttons for the 50-meter platform.

[0010] The beneficial effects of this invention are as follows:

[0011] This solution eliminates the possibility of emergency lance lifting commands being triggered by human error or abnormal feedback values ​​from external encoders. It also adds abnormal protection against high-speed operation of the oxygen lance, cuts off the channel for sending action commands from the oxygen lance lifting to the frequency converter, and avoids accidents such as oxygen lance overshooting in the converter. This prevents serious accidents such as personnel casualties and equipment damage caused by oxygen lance overshooting, and improves the stability of the converter oxygen lance control system.

[0012] 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

[0013] 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:

[0014] Figure 1 This is an electrical schematic diagram of a control system for preventing top-rush accidents during the raising and lowering of a converter oxygen lance, according to the present invention.

[0015] Figure 2 This is the electrical schematic diagram for the signal correlation control between this solution and the existing converter oxygen lance lifting control system.

[0016] Reference numerals: 1QF21 - Air switch, 1Z07SQ1 - First oxygen lance upper limit position counterweight travel switch, 1Z08SQ1 - Second oxygen lance upper limit position counterweight travel switch, 1Z07SQ5 - Oxygen lance lower limit position counterweight travel switch, 1KA33 - First oxygen lance upper limit position relay, 1KA38 - Second oxygen lance upper limit position relay, 1KA37 - Oxygen lance lower limit position relay, SBE01 - 20-meter platform field control box emergency stop button, SBE02 - 50-meter platform field control box emergency stop button, 1KA30 - Oxygen lance emergency stop relay, U1 - Frequency converter, 1KA37-1 - Normally closed contact of oxygen lance lower limit position relay, 1KA33-1 - Normally closed contact of first oxygen lance upper limit position relay, 1KA38-1 - Normally closed contact of second oxygen lance upper limit position relay, 1KA30-1 - Normally open contact of oxygen lance emergency stop relay. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Please see Figures 1-2 This is a control system to prevent top-rush accidents during the raising and lowering of the oxygen lance in a converter. Figure 2 The emergency stop section for the oxygen lance is one of the technical contents of this solution, and its content is the existing converter oxygen lance electrical control system.

[0021] Based on the existing converter oxygen lance electrical control system, this scheme adds the following: first oxygen lance upper limit position counterweight travel switch 1Z07SQ1, second oxygen lance upper limit position counterweight travel switch 1Z08SQ1, oxygen lance lower limit position counterweight travel switch 1Z07SQ5, first oxygen lance upper limit position relay 1KA33, second oxygen lance upper limit position relay 1KA38, oxygen lance lower limit position relay 1KA37, and oxygen lance emergency stop relay 1KA30.

[0022] The first oxygen lance upper limit counterweight travel switch 1Z07SQ1 and the first oxygen lance upper limit position relay 1KA33 are connected in series between the neutral wire and the live wire; the second oxygen lance upper limit counterweight travel switch 1Z08SQ1 and the second oxygen lance upper limit position relay 1KA38 are connected in series between the neutral wire and the live wire; the oxygen lance lower limit counterweight travel switch 1Z07SQ5 and the oxygen lance lower limit position relay 1KA37 are connected in series between the neutral wire and the live wire.

[0023] An oxygen lance emergency stop circuit is formed by connecting the oxygen lance emergency stop relay 1KA30, the normally closed contact 1KA37-1 of the oxygen lance lower limit relay, the normally closed contact 1KA33-1 of the first oxygen lance upper limit relay, and the normally closed contact 1KA38-1 of the second oxygen lance upper limit relay in series. This circuit is connected between the neutral and live wires. The normally open contact 1KA30-1 of the oxygen lance emergency stop relay is connected to the oxygen lance lifting frequency converter U1. The emergency stop circuit also connects in series with normally closed emergency stop buttons on the 20-meter platform and 50-meter platform operation boxes, allowing for manual emergency stop from the outside. This provides more flexible control and adds an extra layer of protection for automatic emergency stop, increasing the system's safety and stability.

[0024] The principle of this invention:

[0025] When an emergency lifting command is triggered due to human error or abnormal feedback from the external encoder, causing the oxygen lance to run at high speed, the first oxygen lance upper limit counterweight travel switch 1Z07SQ1 or the second oxygen lance upper limit counterweight travel switch 1Z08SQ1 closes. The normally closed contact (i.e., 1KA33-1 or 1KA38-1) of the corresponding relay (i.e., the first oxygen lance upper limit relay 1KA33 or the second oxygen lance upper limit relay 1KA38) opens, the oxygen lance emergency stop circuit loses power, triggering the signal to open the normally open contact 1KA30-1 of the oxygen lance emergency stop relay. After receiving this signal, the oxygen lance lifting frequency converter executes the oxygen lance emergency stop command, and the oxygen lance frequency converter stops running.

[0026] 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 preventing top-rush accidents during the raising and lowering of a converter oxygen lance, comprising an oxygen lance raising and lowering frequency converter, characterized in that: It also includes the upper limit counterweight travel switch of the first oxygen lance, the upper limit counterweight travel switch of the second oxygen lance, the lower limit counterweight travel switch of the oxygen lance, the upper limit relay of the first oxygen lance, the upper limit relay of the second oxygen lance, the lower limit relay of the oxygen lance, and the emergency stop relay of the oxygen lance. The first oxygen lance upper limit position counterweight travel switch and the first oxygen lance upper limit position relay are connected in series between the neutral wire and the live wire; the second oxygen lance upper limit position counterweight travel switch and the second oxygen lance upper limit position relay are connected in series between the neutral wire and the live wire; the oxygen lance lower limit position counterweight travel switch and the oxygen lance lower limit position relay are connected in series between the neutral wire and the live wire. An oxygen lance emergency stop relay, the normally closed contact of the oxygen lance lower limit relay, the normally closed contact of the first oxygen lance upper limit relay, and the normally closed contact of the second oxygen lance upper limit relay are connected in series to form an oxygen lance emergency stop circuit. The oxygen lance emergency stop circuit is connected between the neutral wire and the live wire. The normally open contact of the oxygen lance emergency stop relay is connected to the oxygen lance lifting frequency converter. The oxygen lance emergency stop circuit is also connected in series with a normally closed emergency stop button on the platform field operation box. The oxygen lance emergency stop circuit forms a safety rejection loop independent of the original lifting control logic. When any oxygen lance upper limit position counterweight travel switch is triggered, the normally closed contact of the corresponding upper limit position relay is opened, causing the oxygen lance emergency stop relay to lose power and its normally open contact to open, thereby cutting off the action permission signal of the oxygen lance lifting frequency converter.

2. The control system for preventing top-rush accidents during the raising and lowering of the converter oxygen lance according to claim 1, characterized in that: The emergency stop buttons in the platform's on-site control box include emergency stop buttons for the 20-meter platform and emergency stop buttons for the 50-meter platform.

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