A switching system for bottom argon and nitrogen blowing in a steel ladle

Abstract

This utility model relates to a switching system device for bottom argon and nitrogen blowing in steel ladles, belonging to the field of iron and steel smelting technology. The switching system device includes: at least two steel ladles; parallel blowing pipelines independently connected to the bottom of each ladle; a switching end cooperating with the vacuuming end of each ladle; the vacuuming end is equipped with a proximity switch linked to the switching end; the parallel blowing pipelines include: parallel argon blowing pipelines and nitrogen blowing pipelines; the switching end is connected to a vacuuming device or a venting end. The switching system device provided by this utility model, through the cooperation of the switching end and the proximity switch, ensures that nitrogen and argon blowing do not cross-contaminate by confirming the connection between the switching end and the vacuuming device when preparing to blow nitrogen, thus achieving the purpose of preventing errors during nitrogen and argon switching.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting technology, specifically to a switching system device for bottom argon and nitrogen blowing in a steel ladle. Background Technology

[0002] Currently, in the VD refining process of the steelmaking workshop, due to process requirements, the bottom blowing control system of the ladle can blow either argon or nitrogen.

[0003] CN217781203U discloses a ladle bottom-blowing nitrogen-argon switching and metering control system, including a nitrogen pipeline, an argon pipeline, a main pipeline, and two sets of branch pipelines. The ladle has two blowholes, namely a first blowhole and a second blowhole. The nitrogen pipeline and the argon pipeline are connected in parallel to the gas inlet of the main pipeline. One set of branch pipelines is used to connect the main pipeline and the first blowhole, and the other set of branch pipelines is used to connect the main pipeline and the second blowhole. The system is controlled by a pneumatic valve to realize real-time switching of bottom-blowing gas, reducing the tedious operation and misoperation problems of manual valve switching, and can achieve accurate metering of nitrogen blowing volume under high and low speed conditions, while also being compatible with high-precision argon blowing flow control requirements.

[0004] CN213024043U discloses a control system for bottom-blowing gas in a ladle, including a gas control cabinet, a field operation box, a power distribution cabinet, and a main control operating device. The control system allows for selection of nitrogen and argon gas sources. The gas control cabinet includes an intermediate gas control cabinet and a long-nozzle gas control cabinet. The three outlets of the intermediate gas control cabinet are respectively connected to the stopper rod, the upper nozzle, and the plate in the continuous casting system. The long-nozzle gas control cabinet's outlet is connected to the long nozzle in the continuous casting system. The inlets of both the intermediate and long-nozzle gas control cabinets are connected to gas sources, enabling selection of nitrogen and argon gas sources. A PLC controller is installed in either the long-nozzle or intermediate gas control cabinet. The control terminals of the PLC controller are respectively connected to the field operation box and the main control operating device. The PLC controller is powered by the power distribution cabinet and connected to terminal blocks. A manual ball valve is installed on each branch of the intermediate and long-nozzle gas control cabinets.

[0005] Meanwhile, there are strict process requirements regarding when to blow nitrogen. Nitrogen is only permitted during the smelting process, but it cannot be substituted for argon blowing. In other words, it cannot be blown incorrectly or supplied simultaneously, as this would affect the quality of the molten steel. However, current argon and nitrogen blowing systems have a defect in that the timing of nitrogen blowing cannot be properly controlled. This leads to incorrect timing when multiple ladles are operating in tandem, resulting in incorrect blowing and substandard molten iron in the ladles. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide a switching system device for argon and nitrogen blowing at the bottom of a steel ladle, so as to solve the defect that the timing of nitrogen blowing cannot be reasonably controlled during the use of the current argon and nitrogen blowing system, which leads to incorrect timing of nitrogen blowing when multiple steel ladles are operated in tandem, resulting in incorrect blowing and unqualified molten iron in the steel ladle.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This utility model provides a switching system device for bottom argon and nitrogen blowing in a steel ladle, the switching system device comprising:

[0009] At least two steel ladles;

[0010] A parallel air blowing pipeline independently connected to the bottom of the ladle;

[0011] A switching end that cooperates with the vacuuming end of the ladle;

[0012] The vacuuming end is equipped with a proximity switch that is linked to the switching end;

[0013] The parallel blowing pipeline includes: an argon blowing pipeline and a nitrogen blowing pipeline connected in parallel;

[0014] The switching end is connected to a vacuum pump or an air vent.

[0015] The switching system device provided by this utility model, through the cooperation of the switching terminal and the proximity switch, confirms that the switching terminal is connected to the vacuum equipment when preparing to blow nitrogen, so as to ensure that nitrogen blowing and argon blowing will not cross over, thus achieving the purpose of preventing errors when switching nitrogen and argon gases.

[0016] As a preferred technical solution of this utility model, the argon gas blowing pipeline includes a first switching valve, a second switching valve and a first check valve connected in sequence.

[0017] As a preferred technical solution of this utility model, a first vent valve is provided on the pipeline between the first switching valve and the second switching valve.

[0018] As a preferred technical solution of this utility model, the nitrogen blowing pipeline includes a third switching valve, a fourth switching valve and a second check valve connected in sequence.

[0019] As a preferred technical solution of this utility model, a second vent valve is provided on the pipeline between the third switching valve and the fourth switching valve.

[0020] As a preferred technical solution of this utility model, the steel ladle includes: a ladle body and a vacuum tank.

[0021] As a preferred technical solution of this utility model, the parallel air blowing pipeline is connected to the bottom of the package.

[0022] As a preferred technical solution of this utility model, the vacuum tank is connected to the vacuuming end.

[0023] As a preferred technical solution of this utility model, the switching system device is equipped with a control unit.

[0024] As a preferred technical solution of this utility model, the control unit is connected to the parallel air blowing pipeline, the proximity switch and the switching terminal respectively.

[0025] Compared with existing technical solutions, this utility model has the following beneficial effects:

[0026] The switching system device provided by this utility model can realize intelligent switching between nitrogen blowing and argon blowing through the joint control of the control unit, avoiding the defect of unqualified molten iron in the ladle due to incorrect nitrogen blowing time caused by the cross-blowing of argon and nitrogen. Furthermore, the control unit uses artificial intelligence and intelligent algorithms to optimize and iterate the control process, thereby further enhancing the accuracy of the switching timing between nitrogen blowing and argon blowing, and thus further improving the efficiency of smelting. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a switching system device for bottom argon and nitrogen blowing in a steel ladle, provided in an embodiment of this utility model.

[0028] In the diagram: 111-First switching valve, 112-Second switching valve, 113-First check valve, 114-First vent valve, 121-Third switching valve, 122-Fourth switching valve, 123-Second check valve, 124-Second vent valve, 210-Case body, 220-Vacuum tank, 230-Vacuuming end, 231-Proximity switch, 310-Switching end, 320-Vacuuming equipment;

[0029] I - Argon, II - Nitrogen.

[0030] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the claims. Detailed Implementation

[0031] To better illustrate this utility model and facilitate understanding of its technical solution, typical but non-limiting embodiments of this utility model are as follows:

[0032] I. This embodiment provides a switching system device for bottom argon and nitrogen blowing in a steel ladle, such as... Figure 1 As shown, the switching system device includes:

[0033] At least two steel ladles;

[0034] A parallel air blowing pipeline independently connected to the bottom of the ladle;

[0035] A switching end 310 that cooperates with the vacuuming end 230 of the ladle;

[0036] The vacuuming end 230 is equipped with a proximity switch 231 that is linked to the switching end 310;

[0037] The parallel blowing pipeline includes: an argon blowing pipeline and a nitrogen blowing pipeline connected in parallel;

[0038] The switching terminal 310 is connected to the vacuum pumping device 320 or the venting terminal.

[0039] In this invention, each ladle is independently equipped with a parallel air blowing pipeline, but can choose to share one or more switching terminals 310.

[0040] The argon gas blowing pipeline includes a first switching valve 111, a second switching valve 112, and a first check valve 113 connected in sequence.

[0041] In this invention, argon gas I can be selected to enter the argon gas blowing pipeline through the first switch valve 111 via equipment such as a gas cylinder.

[0042] A first vent valve 114 is provided on the pipeline between the first switching valve 111 and the second switching valve 112.

[0043] The nitrogen purging pipeline includes a third switching valve 121, a fourth switching valve 122, and a second check valve 123 connected in sequence.

[0044] In this invention, nitrogen II can be selectively introduced into the nitrogen blowing pipeline via a gas cylinder or other equipment through the third switch valve 121.

[0045] A second vent valve 124 is provided on the pipeline between the third switching valve 121 and the fourth switching valve 122.

[0046] The steel ladle includes a ladle body 210 and a vacuum tank 220. For example, the vacuum tank 220 is configured to wrap or cover the ladle body 210.

[0047] The parallel blowing pipeline is connected to the bottom of the package 210. Specifically, the main pipe of the parallel blowing pipeline is connected to the bottom of the package 210. The supply of argon and nitrogen is switched by the control of the switching valve during argon blowing and nitrogen blowing.

[0048] The vacuum tank 220 is connected to the vacuum pumping end 230.

[0049] The switching system device is equipped with a control unit.

[0050] The control unit is connected to the parallel air blowing pipeline, the proximity switch 231, and the switching terminal 310, respectively.

[0051] In this invention, the switching valve can be selected as a ball valve or other related gas valve that controls the flow or disconnection of the gas path. Specifically, it can be selected as an electrically controlled valve or a manual valve, depending on the actual needs. When a control unit is configured, it is preferable that the electrically controlled valve and the control unit cooperate to achieve the linkage control of argon blowing and nitrogen blowing.

[0052] In this invention, the one-way valve is used to prevent gas backflow fluctuations in the gas path from causing internal changes in the gas flow rate within the gas path.

[0053] In this invention, the vent valve is used to release gas from the pipeline when the gas line is under overpressure or during maintenance.

[0054] In this invention, a gas flow meter and a pressure gauge can also be configured on the air blowing pipeline to monitor the flow rate and pressure of the gas in the air path, so as to achieve reasonable and efficient control of the flow rate and pressure of the blowing air.

[0055] In this invention, the vacuum tank 220 can also be equipped with a barometer and other devices to monitor the vacuum level, so as to ensure that the vacuum level can be controlled within a reasonable range during vacuuming and avoid defects such as excessive vacuuming or substandard vacuuming.

[0056] In this utility model, the switching end 310 can be selected as an electrically controlled switching end or a manual switching end. Specifically, the vacuuming end 230 of the ladle is connected to different ports by switching. This can be achieved by using a multi-way valve or a combination of a multi-way pipe and a valve.

[0057] For example, the operation process of the switching system device is as follows:

[0058] Argon is purged into the ladle initially. Once the argon purging reaches the operational requirements, nitrogen is purged. At this time, the control unit uses proximity switch 231 to determine whether the switching terminal 310 has switched to connect the vacuum end 230 of the ladle to the vacuum equipment 320. If connected, the nitrogen purging pipeline is connected for nitrogen purging. Otherwise, the switching terminal 310 is controlled to connect the vacuum end 230 of the ladle to the vacuum equipment 320, and then the nitrogen purging pipeline is connected for nitrogen purging. When argon is purged, the switching terminal 310 is in a position connecting the vacuum end 230 and the venting end of the ladle for argon purging.

[0059] II. To illustrate the excellent performance of the argon / nitrogen blowing switching system for the bottom of the ladle provided by this utility model, the following practical example is used for explanation:

[0060] Example 1

[0061] This embodiment provides a switching system for bottom argon and nitrogen blowing in a steel ladle, as detailed below:

[0062] 2 steel ladles;

[0063] A parallel air blowing pipeline independently connected to the bottom of the ladle;

[0064] A switching end 310 that cooperates with the vacuuming end 230 of the ladle;

[0065] The vacuuming end 230 is equipped with a proximity switch 231 that is linked to the switching end 310;

[0066] The parallel blowing pipeline includes: an argon blowing pipeline and a nitrogen blowing pipeline connected in parallel;

[0067] The switching terminal 310 is connected to the vacuum pumping device 320 or the venting terminal.

[0068] In this invention, each ladle is independently equipped with a parallel air blowing pipeline, but can choose to share one or more switching terminals 310.

[0069] The argon gas blowing pipeline includes a first switching valve 111, a second switching valve 112, and a first check valve 113 connected in sequence.

[0070] A first vent valve 114 is provided on the pipeline between the first switching valve 111 and the second switching valve 112.

[0071] The nitrogen purging pipeline includes a third switching valve 121, a fourth switching valve 122, and a second check valve 123 connected in sequence.

[0072] A second vent valve 124 is provided on the pipeline between the third switching valve 121 and the fourth switching valve 122.

[0073] The steel ladle includes a ladle body 210 and a vacuum tank body 220.

[0074] The parallel air blowing pipeline is connected to the bottom of the package 210.

[0075] The vacuum tank 220 is connected to the vacuum pumping end 230.

[0076] The switching system device is equipped with a control unit.

[0077] The control unit is connected to the parallel air blowing pipeline, the proximity switch 231, and the switching terminal 310, respectively.

[0078] The process is as follows:

[0079] Argon gas is initially purged from the ladle. Once the argon gas reaches the required level, nitrogen gas is purged. At this time, the control unit uses proximity switch 231 to determine whether the switching terminal 310 has switched to connect the vacuum end 230 of the ladle to the vacuum equipment 320. If it has been connected, the nitrogen gas purging pipeline is connected to purge nitrogen. Otherwise, the control unit controls the switching terminal 310 to connect the vacuum end 230 of the ladle to the vacuum equipment 320, and then connects the nitrogen gas purging pipeline to purge nitrogen.

[0080] Example 2

[0081] This embodiment provides a switching system for bottom argon and nitrogen blowing in a steel ladle, as detailed below:

[0082] 4 steel ladles;

[0083] Parallel air blowing lines are independently connected to the bottom of each of the ladles;

[0084] A switching end 310 that cooperates with the vacuuming end 230 of the ladle;

[0085] The vacuuming end 230 is equipped with a proximity switch 231 that is linked to the switching end 310;

[0086] The parallel blowing pipeline includes: an argon blowing pipeline and a nitrogen blowing pipeline connected in parallel;

[0087] The switching terminal 310 is connected to the vacuum pumping device 320 or the venting terminal.

[0088] The argon gas blowing pipeline includes a first switching valve 111, a second switching valve 112, and a first check valve 113 connected in sequence.

[0089] A first vent valve 114 is provided on the pipeline between the first switching valve 111 and the second switching valve 112.

[0090] The nitrogen purging pipeline includes a third switching valve 121, a fourth switching valve 122, and a second check valve 123 connected in sequence.

[0091] A second vent valve 124 is provided on the pipeline between the third switching valve 121 and the fourth switching valve 122.

[0092] The steel ladle includes a ladle body 210 and a vacuum tank body 220.

[0093] The parallel air blowing pipeline is connected to the bottom of the package 210.

[0094] The vacuum tank 220 is connected to the vacuum pumping end 230.

[0095] The switching system device is equipped with a control unit.

[0096] The control unit is connected to the parallel air blowing pipeline, the proximity switch 231, and the switching terminal 310, respectively.

[0097] The process is as follows:

[0098] Argon gas is initially purged from the ladle. Once the argon gas reaches the required level, nitrogen gas is purged. At this time, the control unit uses proximity switch 231 to determine whether the switching terminal 310 has switched to connect the vacuum end 230 of the ladle to the vacuum equipment 320. If it has been connected, the nitrogen gas purging pipeline is connected to purge nitrogen. Otherwise, the control unit controls the switching terminal 310 to connect the vacuum end 230 of the ladle to the vacuum equipment 320, and then connects the nitrogen gas purging pipeline to purge nitrogen.

[0099] Example 3

[0100] This embodiment provides a switching system for bottom argon and nitrogen blowing in a steel ladle, as detailed below:

[0101] 3 steel ladles;

[0102] Parallel air blowing lines are independently connected to the bottom of each of the ladles;

[0103] A switching end 310 that cooperates with the vacuuming end 230 of the ladle;

[0104] The vacuuming end 230 is equipped with a proximity switch 231 that is linked to the switching end 310;

[0105] The parallel blowing pipeline includes: an argon blowing pipeline and a nitrogen blowing pipeline connected in parallel;

[0106] The switching terminal 310 is connected to the vacuum pumping device 320 or the venting terminal.

[0107] In this invention, each ladle is independently equipped with a parallel air blowing pipeline, but can choose to share one or more switching terminals 310.

[0108] The argon gas blowing pipeline includes a first switching valve 111, a second switching valve 112, and a first check valve 113 connected in sequence.

[0109] A first vent valve 114 is provided on the pipeline between the first switching valve 111 and the second switching valve 112.

[0110] The nitrogen purging pipeline includes a third switching valve 121, a fourth switching valve 122, and a second check valve 123 connected in sequence.

[0111] A second vent valve 124 is provided on the pipeline between the third switching valve 121 and the fourth switching valve 122.

[0112] The steel ladle includes a ladle body 210 and a vacuum tank body 220.

[0113] The parallel air blowing pipeline is connected to the bottom of the package 210.

[0114] The vacuum tank 220 is connected to the vacuum pumping end 230.

[0115] The switching system device is equipped with a control unit.

[0116] The control unit is connected to the parallel air blowing pipeline, the proximity switch 231, and the switching terminal 310, respectively.

[0117] The process is as follows:

[0118] Argon gas is initially purged from the ladle. Once the argon gas reaches the required level, nitrogen gas is purged. At this time, the control unit uses proximity switch 231 to determine whether the switching terminal 310 has switched to connect the vacuum end 230 of the ladle to the vacuum equipment 320. If it has been connected, the nitrogen gas purging pipeline is connected to purge nitrogen. Otherwise, the control unit controls the switching terminal 310 to connect the vacuum end 230 of the ladle to the vacuum equipment 320, and then connects the nitrogen gas purging pipeline to purge nitrogen.

[0119] By adopting the above-mentioned switching system, the defect of substandard molten iron in the ladle caused by incorrect nitrogen blowing time due to the cross-blowing of argon and nitrogen can be avoided. Furthermore, the control unit uses artificial intelligence and intelligent algorithms to optimize and iterate the control process, thereby further enhancing the accuracy of the switching timing between nitrogen and argon blowing, and thus further improving the efficiency of smelting.

[0120] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0121] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0122] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A switching system for bottom argon and nitrogen blowing in a steel ladle, characterized in that, The switching system device includes: At least two steel ladles; A parallel air blowing pipeline independently connected to the bottom of the ladle; A switching end that cooperates with the vacuuming end of the ladle; The vacuuming end is equipped with a proximity switch that is linked to the switching end; The parallel blowing pipeline includes: an argon blowing pipeline and a nitrogen blowing pipeline connected in parallel; The switching end is connected to a vacuum pump or an air vent.

2. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 1, characterized in that, The argon gas blowing pipeline includes a first switching valve, a second switching valve, and a first check valve connected in sequence.

3. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 2, characterized in that, A first vent valve is installed on the pipeline between the first switching valve and the second switching valve.

4. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 1, characterized in that, The nitrogen purging pipeline includes a third switching valve, a fourth switching valve, and a second check valve connected in sequence.

5. The switching system device for bottom argon and nitrogen blowing in a steel ladle as described in claim 4, characterized in that, A second vent valve is installed on the pipeline between the third and fourth switching valves.

6. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 1, characterized in that, The ladle comprises: a ladle body and a vacuum tank.

7. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 6, characterized in that, The parallel air blowing pipeline is connected to the bottom of the package.

8. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 7, characterized in that, The vacuum tank is connected to the vacuum pumping end.

9. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 1, characterized in that, The switching system is equipped with a control unit.

10. The switching system for bottom argon and nitrogen blowing in a steel ladle as described in claim 9, characterized in that, The control unit is connected to the parallel air blowing pipeline, the proximity switch, and the switching terminal, respectively.

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