A feed device for a gas delivery AOD slag modifier

Abstract

This invention discloses a gas-conveying feeding device for AOD slag modifier. It includes: a silo support; a modifier silo mounted on the silo support via a weighing device; a dust removal duct and a gas conveying pipe installed on the top of the modifier silo; a rotary valve installed at the silo discharge port; and a discharge pipe connected to the rotary valve output port in a non-load-bearing manner. This invention employs a weighing device and rotary valve design, enabling accurate quantitative feeding and avoiding the previous manual, unpredictable feeding method. This invention utilizes a simultaneous gas conveying and dust removal mechanism, with the entire process taking place within a sealed silo, meeting green and environmentally friendly smelting requirements, significantly improving the environment, and requiring no manual intervention, only remote control.

Description

Technical Field

[0001] This invention relates to a gas-conveying feeding device for AOD slag modifier. Background Technology

[0002] Stainless steel AOD smelting generates a large amount of steel slag. Before the addition of modifiers, AOD slag is a highly alkaline, chromium-containing, calcium-magnesium silicate-rich metallurgical byproduct with resource utilization value, but it also poses environmental risks. Therefore, it needs to be modified and treated to ensure safe utilization. There are several ways to add modifiers. For example, they can be added during the refining process, generally from a high-level silo or furnace opening, ensuring full contact with the molten slag. Alternatively, they can be added later, such as adding the modifier to the slag pan before slag discharge. After the steel slag is poured into the pan, the modifier provides special treatment to improve the metallurgical properties of the stainless steel refining slag, improve its fluidity, inhibit cooling pulverization, stabilize harmful components, and enhance its resource utilization value. The cooled slag can then be crushed, screened, and magnetically separated according to existing normal processes for maximum utilization. Summary of the Invention

[0003] To overcome the above-mentioned defects, the purpose of this invention is to provide a feeding device for gas-conveying AOD slag modifier.

[0004] To achieve the above objectives, the gas-conveying AOD slag modifier feeding device of the present invention is characterized by comprising: a silo support; The modifier silo is installed on the silo support via a weighing device; a dust removal duct and a gas conveying pipe are respectively installed on the top of the modifier silo; A star-shaped discharge valve is installed at the discharge port of the modifier silo; The output port of the star-shaped discharge valve is connected to the discharge pipe in a non-load-bearing manner.

[0005] Furthermore, a rotating mechanism 5 is provided on the feeding tube to drive the feeding tube to rotate by a predetermined angle.

[0006] Furthermore, an extension tube is fitted outside the feed tube, and a telescopic device is provided between the feed tube and the extension tube to drive the extension tube to move relative to the feed tube.

[0007] Furthermore, guide rollers are provided on the outer wall of the feed pipe or the inner wall of the extension pipe.

[0008] Furthermore, the modifier silo is equipped with a maintenance and explosion vent 9. The present invention has the following advantages: 1. This invention is a gas-conveying AOD slag modifier feeding device before AOD slag treatment. The modifier can improve the performance of AOD slag.

[0009] 2. This invention is highly targeted, mainly for liquid slag poured into the slag pan in the AOD smelting industry.

[0010] 3. The present invention adopts a weighing device 2 and a star-shaped unloading valve 4, which can accurately and quantitatively add materials, avoiding the previous manual and ambiguous feeding mode.

[0011] 4. This invention adopts a gas conveying and dust removal synchronous working mechanism. The whole process is carried out in a closed silo, which meets the requirements of green and environmentally friendly smelting, significantly improves the environment, and requires no manual intervention, only remote control.

[0012] 5. This invention adopts a dual design of dust removal and explosion relief valve, which is both environmentally friendly and safe, ensuring pressure balance inside the silo and preventing silo explosion accidents of modifier silo 1.

[0013] 6. The present invention adopts a telescopic rotating material tube design, which can maximize the protection of the material tube from damage by slag splash during AOD smelting and dumping, while ensuring the passage of vehicles and equipment under the AOD furnace.

[0014] 7. The present invention adopts a uniformly distributed guide roller 12 design, which reduces the moving resistance of the telescopic tube 6 and can also prevent the extension tube from deforming.

[0015] 8. The present invention adopts a rotary seal between the discharge port of the star-shaped unloading valve 04 and the inlet of the telescopic material pipe 6, which can prevent dust from overflowing and prevent inaccurate weighing, because the rotating mechanism 5 is fixedly installed on the hopper support 3. Attached Figure Description

[0016] Figure 1 This is a front view of an embodiment of the gas-carrying AOD slag modifier feeding device of the present invention.

[0017] Figure 2 for Figure 1 Top view of the embodiment shown.

[0018] Figure 3 for Figure 1 Left view of the embodiment shown.

[0019] Figure 4 This is a cross-sectional view (internal structure diagram of the telescopic tube).

[0020] Figure 5 This is a diagram showing the rotary sealing structure between the discharge port of the star-shaped unloading valve 4 and the inlet of the telescopic material pipe 6. Detailed Implementation

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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, they should not be construed as limitations on this invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The present invention aims to provide a feeding device for gas-conveying AOD slag modifier, comprising: a silo support 3; The modifier silo 1 is installed on the silo support via a weighing device 2; a dust removal duct 8 and a gas conveying pipe 11 are respectively installed on the top of the modifier silo. A star-shaped discharge valve 4 is installed at the discharge port of the modifier silo; The output port of the star-shaped discharge valve is connected to the discharge pipe 6 in a non-load-bearing manner.

[0026] This invention employs a weighing device 2 and a star-shaped unloading valve 4, which can accurately and quantitatively add materials, avoiding the previous manual and ambiguous feeding mode. This invention adopts a gas conveying and dust removal synchronous working mechanism, and the entire process is carried out in a closed silo, which meets the requirements of green and environmentally friendly smelting, significantly improves the environment, and requires no manual intervention, only remote control.

[0027] Example like Figures 1 to 5 The diagram shown is a structural schematic of an embodiment of the gas-carrying AOD slag modifier feeding device of the present invention. It mainly consists of a modifier silo 1, a weighing device 2, a silo support 3, a star-shaped discharge valve 4, a rotating mechanism 5, a telescopic material pipe 6, a telescopic electric cylinder 7, a dust removal duct 8, a maintenance and explosion relief port 9, an anti-torsion tie rod 10, a gas conveying material pipe 11, and a guide roller 12.

[0028] First, the modifier silo 1 is mounted and positioned on the silo support 3 via the weighing device 2. To protect the weighing device 2 and prevent the modifier silo 1 from shaking, anti-torsion rods 10 are installed on three sides of the modifier silo 1 and the silo support 3. The anti-torsion rods 10 can adjust the movement space of the silo via screws. The top of the modifier silo 1 is equipped with a dust removal duct 8, a gas conveying pipe 11, and a maintenance and explosion relief port 9. The gas conveying pipe 11 is used to convey the modifier to the modifier silo. The material is conveyed to the designated silo under positive pressure gas. The maximum gas conveying pressure can reach 800 kPa. Since the modifier particles are small and accompanied by dust, and the pressure in the modifier silo 1 cannot be too high, the dust removal duct 8 is used for dust removal inside the modifier silo 1 and also has a pressure relief function. To prevent the granular modifier from being sucked away by the negative pressure of the dust removal, a filter screen is installed at the flange connection of the dust removal duct 8, allowing only gas and dust to pass through, while granular modifier cannot pass through. The inspection and maintenance vent 9 is a vent valve installed on the routine maintenance flange. For safety, if the pressure in the modifier silo 1 is too high, the vent valve will burst to release pressure and prevent the silo from bursting. A rotary valve 4 is installed at the discharge port of the modifier silo 1. This valve can control the discharge speed and discharge volume according to the motor speed. With the cooperation of the weighing device 2, the discharge volume can be well controlled. The output port of the rotary valve 4 is connected to the rotating mechanism 5 of the discharge pipe. Note that the rotating mechanism 5 and the rotary valve 4 are not rigidly connected; they are connected through a rotary seal and non-load-bearing contact. Otherwise, weighing will be affected. The rotating mechanism 5 is fixedly installed on the silo support 3. When the rotary motor starts, the rotating mechanism 5 will drive the telescopic pipe 6 to rotate via the slewing bearing. An extension tube is fitted over the telescopic material tube 6. Guide rollers 12 are evenly distributed on the outside of the telescopic material tube 6. The extension tube is fitted onto the telescopic material tube via the guide rollers 12. A telescopic electric cylinder 7 can move up and down along the telescopic material tube. The end of the telescopic electric cylinder 7 is fixed to the telescopic material tube. Thus, both the telescopic material tube 6 and the telescopic electric cylinder 7 can rotate 90° via the rotating mechanism 5. The guide rollers 12 are arranged on the surface of the telescopic material tube and are installed throughout the entire stroke of the extension tube. Five sets of guide rollers 12 reduce resistance during the up-and-down movement of the extension tube and prevent deformation. No guide rollers are installed at the bottom of the telescopic material tube; instead, a guiding and limiting mechanism is used. Two long plates welded to the outside of the telescopic material tube restrain one long plate welded to the extension tube in the middle, preventing deflection during the up-and-down movement of the extension tube.

[0029] The workflow is as follows: First, the silo is filled with modifier material through the gas conveying pipe 11, and weighed and counted by the weighing device 2. At the same time as the modifier material is conveyed, the dust removal duct 8 is opened to filter and remove dust, and to ensure that the internal pressure of the modifier material silo 1 is balanced. When the AOD slag pan car reaches the designated position, the rotating mechanism 5 rotates the telescopic material pipe 6 90°, turning it from its concealed position inside the platform to the direction of slag pan discharge. Then, under the action of the telescopic electric cylinder 7, the extension pipe extends downwards to the designated stroke, with the discharge port above the slag pan. Modifier is added according to the required quantitative amount. At this time, the star-shaped discharge valve 4 opens, and modifier material is added to the slag pan through the telescopic material pipe 6. Feedback is received from the weighing device 2. After addition is complete, the star-shaped discharge valve 4 closes and stops working. The extension pipe retracts under the action of the telescopic electric cylinder 7, and the rotating mechanism 5 immediately rotates the entire telescopic material pipe 6 mechanism 90°, concealing it under the platform and behind the protective plate. This is to prevent splashing damage to the material pipe during AOD smelting and slag dumping, and to avoid obstructing the passage of ladle cars, top furnace cars, and other equipment. Simultaneously, the gas conveying pipe 11 and dust removal duct 8 are also operating, replenishing the modifier material in a timely manner. After all processes are completed, the machine awaits the next work cycle.

[0030] The above process requires explanation as follows: First: The legs of the hopper support 3 are designed so that they do not interfere with the rotation of the telescopic material tube 6.

[0031] Second: After the telescopic material tube 6 rotates back to the platform and the protective plate, the protective plate will have an automatic sealing device to seal the gap in the material tube and prevent steel slag from splashing and causing damage.

[0032] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0033] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A feeding device for gas-conveying AOD slag modifier, characterized in that, include: hopper support; The modifier silo is installed on the silo support via a weighing device; a dust removal duct and a gas conveying pipe are respectively installed on the top of the modifier silo; A star-shaped discharge valve is installed at the discharge port of the modifier silo; The output port of the star-shaped discharge valve is connected to the discharge pipe in a non-load-bearing manner.

2. The feeding device for gas-conveying AOD slag modifier as described in claim 1, characterized in that, A rotating mechanism is provided on the feeding tube to drive the feeding tube to rotate by a predetermined angle.

3. The feeding device for gas-conveying AOD slag modifier as described in claim 1, characterized in that, An extension tube is also sleeved outside the feed tube, and a telescopic device is provided between the feed tube and the extension tube to drive the extension tube to move relative to the feed tube.

4. The feeding device for gas-conveying AOD slag modifier as described in claim 1, characterized in that, Guide rollers are provided on the outer wall of the feed pipe or the inner wall of the extension pipe.

5. The feeding device for gas-conveying AOD slag modifier as described in claim 1, characterized in that, The modifier silo is equipped with an inspection and explosion vent.

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