A multifunctional pipeline for automatic docking of argon blowing in molten steel tanks

Abstract

The invention discloses a multifunctional pipeline for automatic argon docking of a molten steel tank, comprising an air inlet base, a horizontal pipe section, a right-angle pipe section and a metal hose II. An argon blowing pipe connected to a main air supply pipe is provided on the air inlet base; a filter, a one-way valve, a three-way valve and an elbow are sequentially provided on the horizontal pipe section, the elbow and the third passage of the three-way valve are respectively connected to an air supply branch pipe, the right-angle pipe section is provided in a pair and respectively connected to the air supply branch pipe, and a ball valve is provided on the air supply branch pipe; a three-way valve I is provided between the three-way valve and the elbow, and the third passage of the three-way valve I is connected to a manual docking pipe; the invention is installed on a molten steel tank base, and by providing an automatic air supply circuit and a manual air supply circuit, it can realize online rapid replacement and maintenance during the turnover of the molten steel tank, and temporary switching of the automatic and manual circuits in a fault state, thereby ensuring successful argon blowing of the molten steel tank, avoiding the safety hazards of personnel getting on and off the steel tank car, reducing the consumption of auxiliary materials, and ensuring the stability and continuity of the production rhythm.

Description

Technical Field

[0001] The invention belongs to the technical field of argon blowing systems for molten steel tanks in the metallurgical industry, and particularly relates to the technical field of automatic docking multifunctional pipelines for argon blowing of molten steel tanks. Background Art

[0002] Argon blowing into the ladle is a crucial steelmaking process, and breather bricks are key functional components. Typically, one or more breather bricks are placed at the bottom of a casting ladle or brick-lined ladle. Argon gas is blown through the bricks to agitate the molten steel in the ladle, promoting uniformity of composition, facilitating the rise of inclusions, and partially removing dissolved gases. Argon blowing can also regulate the temperature of the molten steel, in line with the continuous casting production rhythm.

[0003] Generally, a molten steel tank is usually equipped with two air bricks, and two seamless steel pipes are respectively provided on the main body. One end of the pipe is connected to the pipe joint extending from the end of the air brick at the bottom of the molten steel tank through a metal hose, and the other end is a quick connector, which is connected to the argon blowing pipeline gas source joint of the steel tank truck at the working processing position of the steel tank.

[0004] Generally, after the molten steel tank is located at the processing station, the operator climbs up the steel tank car through the ladder and connects the gas source hose connector on the steel tank car with the quick connector at one end of the pipeline. After the molten steel processing is completed, the operator climbs up the steel tank car through the ladder and unplugs the quick connector.

[0005] When the molten steel is being processed at the ladle, it stirs, potentially causing slag to splash out. Since the red slag is hot, it accumulates on the ladle truck, forcing operators to step over it when getting on and off the truck, posing a safety hazard. Secondly, the quick-connect connection management method lacks sealing, which can easily cause leaks, leading to argon blowdown failures, disrupting production flow, and even causing production interruptions in severe cases. Thirdly, the hoses on the ladle truck are splashed with red slag, causing leaks and requiring frequent replacement, which also increases the cost of production consumables.

[0006] The Chinese patent application number is 2022211567773, and the applicant is: Shougang Jingtang United Iron and Steel Co., Ltd., which discloses a ladle bottom blowing argon pipeline system, which is provided with a first air inlet pipeline, a gas test component, a delivery pipeline and a sealing component. Specifically, the first air inlet pipeline is connected to the argon pipeline and the delivery pipeline, and argon is delivered to the ladle through the delivery pipeline, and a gas test component is provided on the first air inlet pipeline to detect whether the flow rate of argon in the first air inlet pipeline meets the requirements of the argon blowing operation, and a sealing component is provided on the delivery pipeline, which reduces the possibility of argon leakage and solves the problem of leakage of the mushroom head of the traditional bottom blowing method on the bottom blowing; the pipeline system has a simple and reasonable structure, safe and reliable performance, good sealing effect, reduces the use cost, improves the efficiency of the argon blowing operation and the success rate of the ladle bottom blowing, and reduces the safety risk of personnel.

[0007] The Chinese patent application number is 2020212930587, and the applicant is Shandong Iron and Steel Co., Ltd., which discloses an automatic argon blowing docking device for a ladle, including a launching device and a receiving device. The launching device includes a launcher, a launching cylinder, a connecting rod, a connecting rod base, a first argon pipe, and a second argon pipe. The receiving device includes a receiver and a third argon pipe; the launcher includes a spherical connector with an argon channel in the center and a sliding rod, the launching cylinder includes a plunger and a first cylinder cavity and a second cylinder cavity, and the second argon pipe The tube is connected to the first cylinder cavity, and the connecting rod is a hollow pipe structure, which is inserted into the central hole of the connecting rod base and inserted through the plunger. One end of the connecting rod is connected to the sliding rod and connected to the argon channel, and the other end is connected to the first argon pipe; the receiver includes a receiving bowl, a connecting pipe and an argon pipe, and an inner spherical accommodating cavity is provided in the receiving bowl. One end of the argon pipe is connected to the inner spherical accommodating cavity, and the other end is connected to the third argon pipe; the utility model realizes the automatic docking of the ladle argon and the dual-gas, dual-pass and dual-control of the ladle ventilation and argon blowing.

[0008] The above two structures are commonly used ladle automatic argon blowing docking devices in this field. The former adopts ventilation and pressure monitoring first to solve the problem of leakage of the mushroom head in the traditional bottom blowing method affecting the bottom blowing. The latter adopts the improvement of the ventilation part of the quick connector to automatically dock the ladle argon and ventilate and blow argon into the ladle. These two methods ensure the safety of workers during automatic argon blowing of the ladle. However, when the automatic argon blowing docking line of the ladle fails, the argon blowing of the ladle needs to be stopped, which may easily lead to a long parking time of the ladle during transportation, low efficiency of argon blowing of the ladle, and poor quality of molten steel. Summary of the Invention

[0009] 1. Technical problem to be solved by the invention

[0010] The purpose of the present invention is to overcome the problem that when the existing automatic argon blowing docking pipeline of the ladle fails, the ladle argon blowing needs to be stopped, which cannot ensure the stability and continuity of molten steel production, and provides a multifunctional pipeline for automatic docking of argon blowing of a molten steel tank; the multifunctional pipeline for automatic docking of argon blowing of a molten steel tank is installed on the tank base of the molten steel tank, one end of which is connected to the main pipeline for air intake, and the other end is connected to the air-permeable brick at the bottom of the molten steel tank through a metal hose and a quick connector. By providing an automatic air supply circuit and a manual air supply circuit, it is possible to realize online rapid replacement and maintenance during the turnover of the molten steel tank, and temporary switching of automatic and manual circuits in a fault state, thereby ensuring successful argon blowing of the molten steel tank, avoiding the safety hazards of personnel getting on and off the steel tank car, reducing the consumption of auxiliary materials, and ensuring the stability and continuity of the production rhythm.

[0011] 2. Technical solution

[0012] To achieve the above-mentioned object, the present invention provides a multifunctional automatic docking pipeline for argon blowing of a molten steel tank, comprising an automatic docking pipeline having one end connected to a main gas supply pipeline for air intake and the other end connected to a breathable brick at the bottom of the molten steel tank through a metal hose and a quick connector for air supply. The automatic docking pipeline comprises an air inlet base provided on a molten steel tank seat, a horizontal pipe section extending from a side wall of the molten steel tank seat, a right-angle pipe section, and a metal hose II provided at the end of the right-angle pipe section and used to connect to the breathable brick at the bottom of the molten steel tank, which are connected in sequence. An argon blowing pipe connected to the main gas supply pipeline is provided on the air inlet base;

[0013] The horizontal pipe section is provided with a filter, a one-way valve, a three-way valve and an elbow in sequence, the elbow and the third passage of the three-way valve are respectively connected to the air supply branch pipe, the right-angle pipe section is provided in a pair and is respectively connected to the air supply branch pipe, and the air supply branch pipe is provided with a ball valve;

[0014] A three-way valve I is provided between the three-way valve and the elbow, and the third passage of the three-way valve I is connected to a manual docking pipe;

[0015] The manual docking line is provided with a one-way valve I and a quick connector I for connecting the main air supply line to the air intake.

[0016] Furthermore, a quick-change joint connected to the right-angle pipe section is provided at the end of the air supply branch pipeline, and a metal hose I is provided between the ball valve and the quick-change joint.

[0017] Furthermore, a metal hose is provided between the air inlet base and the horizontal pipe section.

[0018] Furthermore, the horizontal pipe section is arranged perpendicular to the tank body, and the gas supply branch pipe is arranged parallel to the tank body.

[0019] Furthermore, the three-way valve and the three-way valve I are arranged vertically, and the three-way valve I is connected to the manual docking pipeline through the downward bend pipe I.

[0020] Furthermore, the air inlet base includes an upper steel plate and a lower steel plate with corresponding center holes. The upper steel plate and the lower steel plate are connected into a whole by bolts. A pipe joint connected to a metal hose is welded at the top of the upper steel plate at the center hole, and the argon blowing tube is welded to the bottom of the lower steel plate at the center hole.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0023] 1. The multifunctional automatic docking pipeline for argon blowing of a molten steel tank of the present invention is installed on the tank base of the molten steel tank. One end of the pipeline is connected to the main pipeline for air intake, and the other end is connected to the air-permeable brick at the bottom of the molten steel tank through a metal hose and a quick connector. By providing an automatic air supply circuit and a manual air supply circuit, it is possible to realize online rapid replacement and maintenance during the turnover of the molten steel tank, and temporarily switch between the automatic and manual circuits in a fault state, thereby ensuring successful argon blowing of the molten steel tank, avoiding the safety hazards of personnel getting on and off the steel tank car, reducing the consumption of auxiliary materials, and ensuring the stability and continuity of the production rhythm.

[0024] 2. The multifunctional pipeline for automatic argon docking of a molten steel tank of the present invention is combined with the working environment of the use of the breathable bricks of the molten steel tank and possible sudden fault conditions to realize the free switching between automatic argon docking and manual docking for coping with sudden conditions during on-site use, and is used for manually blowing argon permeable bricks to check their patency during hot repair and maintenance of the molten steel tank. The present invention has a simple structure, easy operation and low cost, and meets the actual needs of the production site to the greatest extent, ensuring the automatic docking of the breathable bricks of the molten steel tank for argon blowing and achieving the purpose of successful argon blowing, while reducing the operating workload and eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a multifunctional pipeline for automatic docking of argon blowing in a molten steel tank according to the present invention;

[0026] Figure 2 This is a structural diagram of a valve seat pipeline in a multifunctional pipeline for automatic argon blowing of a molten steel tank according to the present invention;

[0027] Figure 3 This is a structural schematic diagram of a right-angle pipeline in a multifunctional pipeline for automatic argon blowing of a molten steel tank according to the present invention;

[0028] Figure 4 This is a structural diagram of an air inlet chassis seat in a multifunctional pipeline for automatic argon blowing of a molten steel tank according to the present invention;

[0029] Figure 5 for Figure 4 Top view of .

[0030] Description of the numbers in the schematic diagram:

[0031] 1. Air inlet base; 2. Externally threaded double-tube joint; 3. Metal hose; 4. Union; 5. Filter; 6. Check valve; 7. Horizontal pipe section; 8. Steel tank base; 9. Elbow; 10. Three-way valve; 11. Ball valve; 12. Quick connector; 13. Metal hose I; 14. Manual docking line; 15. Elbow I; 16. Check valve I; 17. Quick connector I; 18. Externally threaded double-tube joint I; 19. Three-way valve I; 20. Right-angle pipe section; 21. Metal hose II; 22. Mounting bolts. DETAILED DESCRIPTION

[0032] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-Figure 5 This is a schematic structural diagram of a multifunctional automatic docking pipeline for argon blowing of a molten steel tank according to the present invention. The multifunctional automatic docking pipeline for argon blowing of a molten steel tank according to this embodiment includes an automatic docking pipeline having one end connected to a main gas supply pipeline for air intake and the other end connected to a breathable brick at the bottom of the molten steel tank through a metal hose and a quick connector for air supply. The automatic docking pipeline includes an air inlet base 1 provided on the molten steel tank seat, a horizontal pipe section 7 extending from the side wall of the molten steel tank seat, a right-angle pipe section 20, and a metal hose II21 provided at the end of the right-angle pipe section 20 and used to connect to the breathable brick at the bottom of the molten steel tank, which are connected in sequence. An argon blowing pipe connected to the main gas supply pipeline is provided on the air inlet base 1.

[0034] The horizontal pipe section is provided with a filter 5, a one-way valve 6, a three-way valve 10 and an elbow 9 in sequence. The third passages of the elbow 9 and the three-way valve 10 are respectively connected to the gas supply branch pipe. A pair of right-angle pipe sections 20 are provided and are respectively connected to the gas supply branch pipe. A ball valve 11 is provided on the gas supply branch pipe.

[0035] A three-way valve I19 is provided between the three-way valve 10 and the elbow 9, and the third passage of the three-way valve I19 is connected to the manual docking pipe 14;

[0036] The manual docking pipe 14 is provided with a one-way valve I16 and a quick connector I17 for connecting with the main air supply pipe for air intake.

[0037] In this embodiment, the automatic air inlet chassis is fixed on the molten steel tank base and is connected to the air brick at the bottom of the molten steel tank through the horizontal pipe section 7, the right-angle pipe section 20 and the metal hose II21 to achieve smooth air flow, so that argon can enter the air brick from the air inlet and be blown into the molten steel smoothly. The horizontal pipe section 7 and the air supply branch pipe are welded together by an external threaded double pipe joint 2, a flexible joint 4, a filter 5, a one-way valve 6, a multi-section steel pipe, an elbow 9, a three-way valve 10, a ball valve 11 and a quick connector 12. The steel pipe is a seamless steel pipe. The main frame of the pipeline, the union 4 is connected to the filter 5, the purpose of the filter 5 is to prevent foreign matter such as steel slag from entering the pipeline along with the air flow and thus entering the one-way valve 6; the filter 5 is connected to the one-way valve 6, the purpose of the one-way valve 6 is to prevent the gas from flowing into the automatic joint when the manual joint mode is used, that is, the air flow is only allowed to flow in one direction in the automatic docking mode; the one-way valve 6 is connected to the steel pipe through the union 4, the steel pipe is connected to the three-way valve 10, the other end of the three-way valve 10 is connected to the union 4, the union 4 is connected to the ball valve 11, The ball valve 11 is connected to an externally threaded double-tube joint, which is connected to a metal hose II21 to realize a gas supply circuit; the third end of the three-way valve 10 is still connected to a three-way valve I19; one end of the second three-way valve I19 is connected to an elbow 9, which is connected to a flexible joint 4, which is connected to the ball valve 11, and the ball valve 11 is connected to an externally threaded double-tube joint, which is connected to a metal hose II21 to realize another gas supply circuit; the other end of the second three-way valve I19 is also connected to an elbow Pipe I15, elbow I15 is connected to external threaded double-tube joint I18, external threaded double-tube joint I18 is connected to one-way valve I16, one-way valve I16 is connected to external threaded double-tube joint I18, and then to quick joint I17. When an abnormal situation occurs in the automatic docking, this circuit is used to manually connect the quick joint female head on the steel tank car to the quick joint I17. The gas enters the manual gas supply circuit through the main gas supply pipeline on the steel tank car, and then flows into the aforementioned two furnace circuits through the three-way valve 19, and finally enters the breathable bricks of the molten steel tank.

[0038] In a preferred embodiment, a quick-change connector 12 connected to the right-angle pipe section is provided at the end of the air supply branch pipeline, and a metal hose I13 is provided between the ball valve 11 and the quick-change connector 12 on the air supply branch pipeline. This structure of the present embodiment facilitates rapid offline maintenance and replacement.

[0039] In a preferred embodiment, a metal hose 3 is provided between the air inlet base 1 and the horizontal pipe section 7. The interior of the metal hose 3 is a steel pipe, and the outer layer is attached with a layer of protective steel mesh woven with metal wire. It has a certain degree of bending freedom, is convenient for pipe routing, and is easy to operate, meeting the actual needs of on-site production, and can realize online rapid replacement of pipeline components in high-temperature use environments.

[0040] In a preferred embodiment, the horizontal pipe section 7 is arranged perpendicular to the tank body, and the gas supply branch pipeline is arranged parallel to the tank body. This structure facilitates the routing of pipes and avoids mutual interference. The horizontal pipe section 7 and the gas supply branch pipeline are right-angled, and the right-angle pipe section 20 is right-angled. One section is vertical, that is, welded parallel to the tank body, and one section is welded parallel to the tank bottom. Positioning blocks are added to the sections as needed to prevent the horizontal pipe section 7, the gas supply branch pipeline and the right-angle pipe section 20 from shaking and falling off during the use of the steel tank.

[0041] In a preferred embodiment, the three-way valve 10 and the three-way valve I19 are arranged vertically, and the three-way valve I19 is connected to the manual docking pipe 14 through the downward bend pipe I15. This embodiment adopts the vertical arrangement of the three-way valve 10 and the three-way valve I19 based on the standard size of the molten steel tank body, combined with the layout of the argon blowing pipeline, the convenience of pipeline connection and replacement, and taking into account the operating environment of the air bricks and the specific requirements of the hot repair operation and maintenance of the molten steel tank.

[0042] In a preferred embodiment, the air inlet base 1 includes an upper steel plate and a lower steel plate with corresponding center holes. The upper steel plate and the lower steel plate are connected into a whole by bolts. A pipe joint connected to a metal hose is welded to the top of the upper steel plate at the center hole, and an argon blowing tube is welded to the bottom of the lower steel plate at the center hole. In this embodiment, the upper steel plate and the lower steel plate are in the shape of a rectangular parallelepiped, one side is unpolished, and the other layer is a finished steel plate with a polished surface. The two steel plates are stacked and fixed together by bolts and sealed by a sealing ring. A hole is opened in the middle and an argon blowing tube of a custom length is welded.

[0043] The specific implementation process of this embodiment is as follows:

[0044] 1) Install the argon blowing automatic docking device on the molten steel tank body;

[0045] 2) The molten steel tank car is equipped with a sealing ring and piping device of the argon blowing automatic docking system;

[0046] 3) Lift the molten steel ladle by crane and place it steadily on the tank seat of the molten steel ladle truck at the molten steel processing station;

[0047] 4) Turn on the argon blowing source. The gas enters the automatic air inlet chassis through the pipeline and sealing ring device on the molten steel tank car, and enters the breathable bricks and molten steel along the horizontal pipe section 7, the gas supply branch pipe, the right-angle pipe section 20 and the metal hose II21. The argon gas introduced has a certain pressure and flow rate, which causes the molten steel to stir, thereby playing the argon blowing function required by the metallurgical process.

[0048] 5) After the argon blowing treatment of the molten steel is completed, the molten steel ladle is lifted by the crane and enters the next processing station or process.

[0049] When executing step 4), if an abnormal situation occurs in which argon is not able to flow smoothly and cannot enter the molten steel smoothly, the operator needs to climb onto the molten steel tank car, connect the argon blowing hose pipeline quick connector on the tank car with the quick connector I17, and at the same time operate the corresponding valve to open and close to realize manual argon blowing, thereby achieving the argon blowing function required for the metallurgical process.

[0050] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A multifunctional automatic docking pipe for argon blowing of a molten steel tank, comprising an automatic docking pipe with one end connected to the main gas supply pipe for air intake and the other end connected to the air brick at the bottom of the molten steel tank for air supply through a metal hose and a quick connector, characterized by: The automatic docking pipeline includes an air inlet base provided on the molten steel tank seat, a horizontal pipe section extending from the side wall of the molten steel tank seat, a right-angle pipe section, and a metal hose II provided at the end of the right-angle pipe section and used to connect to the air brick at the bottom of the molten steel tank. The air inlet base is provided with an argon blowing pipe connected to the main air supply pipeline. The horizontal pipe section is sequentially provided with a filter, a one-way valve, a three-way valve and an elbow, the elbow and the third passage of the three-way valve are respectively connected to the air supply branch pipe, the right-angle pipe section is provided in a pair and is respectively connected to the air supply branch pipe, and the air supply branch pipe is provided with a ball valve; A three-way valve I is provided between the three-way valve and the elbow, and the third passage of the three-way valve I is connected to a manual docking pipe; The manual docking line is provided with a one-way valve I and a quick connector I for connecting the main air supply line to the air intake; The end of the gas supply branch pipeline is provided with a quick-change joint connected to the right-angle pipe section, and the gas supply branch pipeline is provided with a metal hose I between the ball valve and the quick-change joint; The air inlet base includes an upper steel plate and a lower steel plate with corresponding center holes. The upper steel plate and the lower steel plate are connected into a whole by bolts. A pipe joint connected to a metal hose is welded to the top of the upper steel plate at the center hole, and the argon blowing tube is welded to the bottom of the lower steel plate at the center hole.

2. The multifunctional automatic docking pipeline for argon blowing of a molten steel tank according to claim 1, characterized in that: A metal hose is provided between the air inlet base and the horizontal pipe section.

3. The multifunctional automatic docking pipeline for argon blowing of a molten steel tank according to any one of claims 1 to 2, characterized in that: The horizontal pipe section is arranged perpendicular to the tank body, and the gas supply branch pipe is arranged parallel to the tank body.

4. The multifunctional automatic docking pipeline for argon blowing of a molten steel tank according to claim 3 is characterized by: The three-way valve and the three-way valve I are arranged vertically, and the three-way valve I is connected to the manual docking pipeline through a downward bend pipe I.

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