Preparation method for steel bar oxidation and burning

Abstract

The present invention discloses a method for preparing steel bars by oxidation and burning, and relates to the technical field of steel bar processing. The method comprises the following steps: S1, steel billet selection: selecting steel billets of suitable specifications, and inspecting the quality of the steel billets at the same time, and performing subsequent processing after the inspection is qualified; S2, steel billet cleaning: using a soft brush assembly to clean the outer surface of the steel billet to remove dust and other impurities; S3, low-loss heating of the steel billet: adding the steel billet to the inside of the preheating equipment, and then controlling the preheating equipment to work, preheating the steel billet with low oxidation and burning, and after the preheating is completed, transferring it to a high-efficiency high-temperature furnace to melt and heat it. The present invention uses the coordinated design of air exchange holes, centralized square tubes and manual vent valves, so that users can replace the air in the inner cavity of the heating furnace body with inert gas, which can reduce the oxygen content inside the preheating environment of the steel billet, thereby reducing the oxidation and burning rate of the steel billet, ensuring the output of steel bars, and reducing the production cost of steel bars.

Description

Technical Field

[0001] The invention relates to the technical field of steel bar processing, and in particular to a method for preparing steel bar oxidation and burning. Background Art

[0002] Steel bars refer to steel used for reinforced concrete and prestressed reinforced concrete. Their cross-section is circular, sometimes square with rounded corners, including plain round steel bars, ribbed steel bars, and twisted steel bars. Steel bars for reinforced concrete refer to straight bars or coiled steel bars used for reinforced concrete reinforcement. Their appearance is divided into plain round steel bars and deformed steel bars. The delivery state is straight bars and coiled steel bars. Steel bars are processed from steel billets. During the heating process of the steel billet, the iron element on the surface of the steel billet reacts with the oxidizing gas in the furnace gas to generate iron oxides. The phenomenon of metal loss is called oxidation burning of the steel billet. A Chinese patent discloses an alloy corrosion-resistant steel bar and a preparation method thereof, with the publication number CN114790532B. The technical solution disclosed in the patent document is as follows: it includes smelting, refining, continuous casting, rolling and cooling steps performed in sequence. The raw materials for preparing the alloy corrosion-resistant steel bar include ferrosilicon alloy and silicon-manganese alloy, and the mass ratio of ferrosilicon alloy to silicon-manganese alloy is (2-5):1.

[0003] In order to solve the problem of high Cr and Mo content in corrosion-resistant steel bar alloy elements, which leads to high production cost, the existing technology adopts the method of adding Mo element to greatly reduce the Cr content. However, this patent does not have a low oxidation burning treatment process, and the loss of steel billet during processing is high, which affects the output of steel bar and indirectly leads to high production cost of steel bar. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing steel bar oxidation and burning to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A method for preparing steel bar oxidation and burning, the method comprising the following steps:

[0007] S1. Billet selection: Select billets of appropriate specifications and inspect their quality. After passing the inspection, proceed with subsequent processing;

[0008] S2. Billet cleaning: Use a soft brush assembly to clean the outer surface of the billet to remove dust and other impurities;

[0009] S3. Low-loss heating of steel billets: add the steel billets into the preheating equipment, and then control the preheating equipment to preheat the steel billets with low oxidation and burning losses. After the preheating is completed, transfer them to a high-efficiency high-temperature furnace to melt and heat them;

[0010] S4, casting and forming: pouring molten steel into a steel bar mold, and after cooling it to room temperature, demoulding it to obtain a steel bar blank;

[0011] S5. Finishing treatment: Grind the steel bar blanks and recycle the debris generated by grinding.

[0012] A further improvement of the technical solution of the present invention is that the preheating equipment includes a combustion furnace body, a combustion chamber is opened on the top of the combustion furnace body, a porous plate located in the inner cavity of the combustion chamber is detachably connected to the inner wall of the combustion furnace body, a lifting rod is welded to the top of the combustion furnace body, a low burning loss mechanism is arranged on the top of the lifting rod, and an accelerated combustion mechanism is arranged on the front of the combustion furnace body.

[0013] A further improvement of the technical solution of the present invention is that the low burning loss mechanism includes a heating furnace body fixedly installed on the top of the lifting rod, a hydraulic cylinder is fixedly installed on the left side of the heating furnace body, a fixed cylindrical part is fixedly installed on the movable end of the hydraulic cylinder, a cover plate is rotatably connected to the outer wall of the fixed cylindrical part, ventilation holes are opened on the front and back of the heating furnace body, a centralized square tube is fixedly connected to the front and back of the heating furnace body, a manual ventilation valve is fixedly connected to the side of the centralized square tube away from the heating furnace body, and a support seat is welded between the front and back of the inner wall of the heating furnace body.

[0014] A further improvement of the technical solution of the present invention is that a rapid heat exchange base plate is fixedly installed on the inner wall of the heating furnace body, a graphite column is fixedly installed on the inner wall of the rapid heat exchange base plate, the top and bottom of the graphite column extend to the top and bottom of the rapid heat exchange base plate respectively, a graphite block is fixedly installed on the inner wall of the rapid heat exchange base plate, and the top and bottom of the graphite block are fixedly connected with graphite fins.

[0015] A further improvement of the technical solution of the present invention is that a circulation square cylinder is fixedly installed on the right side of the inner wall of the heating furnace body, a cylindrical cavity is opened on the left side of the circulation square cylinder, an air inlet hole is opened on the outer wall of the circulation square cylinder, an extension shaft is rotatably connected to the inner wall of the circulation square cylinder, an impeller located in the inner cavity of the cylindrical cavity is fixedly installed on the left end of the extension shaft, and a connecting flange located on the right side of the heating furnace body is fixedly installed on the right side of the extension shaft.

[0016] A further improvement of the technical solution of the present invention is that the combustion acceleration mechanism includes a gooseneck rod, which is fixedly connected to the front side of the combustion furnace body, a hollow diverter pipe is fixedly installed at one end of the gooseneck rod away from the combustion furnace body, an air nozzle is fixedly connected to the back side of the hollow diverter pipe, and a central square tube is fixedly connected to the front side of the hollow diverter pipe.

[0017] A further improvement of the technical solution of the present invention is that a partition is fixedly installed on the inner wall of the central square tube, a blower is fixedly installed on the inner wall of the partition, a hollow frame is fixedly installed on the inner wall of the central square tube, and a bent nozzle is fixedly connected to the inner wall of the hollow frame.

[0018] A further improvement of the technical solution of the present invention is that a barrier is fixedly installed on the inner wall of the hollow frame, a connecting square tube is fixedly connected between the two hollow frames, an internally threaded tube is fixedly connected to the top of the connecting square tube, and the top of the internally threaded tube extends to the top of the central square tube.

[0019] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0020] 1. The present invention provides a method for preparing steel bars that have been oxidized and burned. Through the coordinated design of ventilation holes, centralized square tubes and manual vent valves, users can replace the air in the inner cavity of the heating furnace with inert gas, thereby reducing the oxygen content in the preheating environment of the steel billet, thereby reducing the oxidation and burning rate of the steel billet, ensuring the output of steel bars and reducing the production cost of steel bars.

[0021] 2. The present invention provides a method for preparing steel bar oxidation and burning. Through the design of graphite columns, graphite blocks and graphite fins, the heat exchange rate of the air at the top and bottom of the rapid heat exchange bottom plate is improved. Through the design of the connecting flange, the extension shaft can be driven to rotate by an external motor. At the same time, through the cooperation of the circulating square cylinder, cylindrical cavity, air inlet and impeller, a circulating airflow can be formed in the inner cavity of the heating furnace body, thereby improving the heat exchange rate between air and steel billet, shortening the sufficient heating time of the steel billet, and indirectly reducing oxidation and burning.

[0022] 3. The present invention provides a method for preparing steel bar oxidation and burning. Through the design of the blower, air can be absorbed from the front of the central square tube and input into the combustion chamber through the air nozzle. At the same time, through the cooperation of the internal threaded tube, the hollow frame and the bent nozzle, the oxygen output by the external oxygen generating device can be evenly integrated into the above-mentioned air, thereby improving the oxygen content in the combustion chamber, increasing the combustion rate and sufficiency of the fuel, and further shortening the sufficient heating time of the steel billet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a process flow chart of the steel bar preparation method of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the preheating device of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a heating furnace body of the present invention;

[0026] Figure 4 It is a partial cross-sectional structural schematic diagram of the rapid heat exchange bottom plate of the present invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the circulation square drum of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the combustion acceleration mechanism of the present invention;

[0029] Figure 7 It is a schematic cross-sectional structural diagram of the central square tube of the present invention.

[0030] In the figure: 1. combustion furnace body; 2. combustion chamber; 3. perforated plate; 4. lifting rod;

[0031] 5. Low burning loss mechanism; 51. Heating furnace body; 511. Circulating square cylinder; 512. Cylindrical cavity; 513. Air inlet; 514. Extension shaft; 515. Impeller; 516. Connecting flange; 52. Hydraulic cylinder; 53. Fixed cylindrical part; 54. Cover plate; 55. Air exchange hole; 56. Centralized square tube; 57. Manual ventilation valve; 58. Rapid heat exchange bottom plate; 581. Graphite column; 582. Graphite block; 583. Graphite wing; 59. Support seat;

[0032] 6. Combustion acceleration mechanism; 61. Gooseneck rod; 62. Hollow diverter pipe; 63. Air nozzle; 64. Central square tube; 641. Partition; 642. Blower; 643. Internally threaded pipe; 644. Hollow frame; 645. Bent nozzle; 646. Barrier. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with embodiments:

[0034] Example 1

[0035] like Figure 1-7 As shown, the present invention provides a method for preparing steel bar oxidation and burning, and the method for preparing steel bar oxidation and burning comprises the following steps:

[0036] S1. Billet selection: Select billets of appropriate specifications and inspect their quality. After passing the inspection, proceed with subsequent processing;

[0037] S2. Billet cleaning: Use a soft brush assembly to clean the outer surface of the billet to remove dust and other impurities;

[0038] S3. Low-loss heating of steel billets: add the steel billets into the preheating equipment, and then control the preheating equipment to preheat the steel billets with low oxidation and burning losses. After the preheating is completed, transfer them to a high-efficiency high-temperature furnace to melt and heat them;

[0039] S4, casting and forming: pouring molten steel into a steel bar mold, and after cooling it to room temperature, demoulding it to obtain a steel bar blank;

[0040] S5. Finishing treatment: Grind the steel bar blanks and recycle the debris generated by grinding.

[0041] Example 2

[0042] like Figure 1-7 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the preheating equipment includes a combustion furnace body 1, a combustion chamber 2 is opened on the top of the combustion furnace body 1, a porous plate 3 located in the inner cavity of the combustion chamber 2 is detachably connected to the inner wall of the combustion furnace body 1, a lifting rod 4 is welded on the top of the combustion furnace body 1, a low burning loss mechanism 5 is arranged on the top of the lifting rod 4, an accelerating combustion mechanism 6 is arranged on the front of the combustion furnace body 1, the low burning loss mechanism 5 includes a heating furnace body 51 fixedly installed on the top of the lifting rod 4, a hydraulic cylinder 52 is fixedly installed on the left side of the heating furnace body 51, a fixed cylindrical member 53 is fixedly installed on the movable end of the hydraulic cylinder 52, a cover plate 54 is rotatably connected to the outer wall of the fixed cylindrical member 53, ventilation holes 55 are opened on the front and back of the heating furnace body 51, and the heating furnace body 51 The front and back sides of the furnace body 51 are fixedly connected with a centralized square tube 56, and a manual ventilation valve 57 is fixedly connected to the centralized square tube 56 on the side away from the heating furnace body 51. A support seat 59 is welded between the front and back sides of the inner wall of the heating furnace body 51. The external inert gas output device is pre-connected to the manual ventilation valve 57, and the two manual ventilation valves 57 are controlled to be opened. At the same time, the external inert gas output device is controlled to operate, so that the air in the inner cavity of the heating furnace body 51 can be replaced with an inert gas, and oxidation burning can be reduced by reducing the oxygen content. The hydraulic cylinder 52 is controlled to extend, so that the cover plate 54 is separated from the top of the heating furnace body 51, and then the cover plate 54 is rotated to be moved out from the top of the heating furnace body 51, so that the user can place the steel billet conveniently. The structure of the support seat 59 is composed of a plurality of cylindrical rods.

[0043] Example 3

[0044] like Figure 1-7As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, a rapid heat exchange bottom plate 58 is fixedly installed on the inner wall of the heating furnace body 51, a graphite column 581 is fixedly installed on the inner wall of the rapid heat exchange bottom plate 58, the top and bottom of the graphite column 581 extend to the top and bottom of the rapid heat exchange bottom plate 58 respectively, a graphite block 582 is fixedly installed on the inner wall of the rapid heat exchange bottom plate 58, and the top and bottom of the graphite block 582 are fixedly connected with graphite fins 583, a circulation square cylinder 511 is fixedly installed on the right side of the inner wall of the heating furnace body 51, a cylindrical cavity 512 is opened on the left side of the circulation square cylinder 511, an air inlet hole 513 is opened on the outer wall of the circulation square cylinder 511, and an extension shaft is rotatably connected to the inner wall of the circulation square cylinder 511 514, the left end of the extension shaft 514 is fixedly installed with an impeller 515 located in the inner cavity of the cylindrical cavity 512, and the right side of the extension shaft 514 is fixedly installed with a connecting flange 516 located on the right side of the heating furnace body 51. Through the design of the graphite column 581, the graphite block 582 and the graphite wing 583, the heat exchange rate of the top air and the bottom air of the rapid heat exchange bottom plate 58 is improved. Through the design of the connecting flange 516, the output shaft of the external motor can be fixedly connected to the extension shaft 514, and the operation of the external motor can be controlled to drive the extension shaft 514 to rotate. At the same time, through the cooperation of the circulating square tube 511, the cylindrical cavity 512, the air inlet 513 and the impeller 515, a circulating airflow can be formed in the inner cavity of the heating furnace body 51, thereby improving the heat exchange rate between air and the steel billet.

[0045] Example 4

[0046] like Figure 1-7As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the combustion acceleration mechanism 6 includes a gooseneck rod 61, the gooseneck rod 61 is fixedly connected to the front of the combustion furnace body 1, a hollow diverter pipe 62 is fixedly installed at one end of the gooseneck rod 61 away from the combustion furnace body 1, a nozzle 63 is fixedly connected to the back of the hollow diverter pipe 62, a central square tube 64 is fixedly connected to the front of the hollow diverter pipe 62, a partition 641 is fixedly installed on the inner wall of the central square tube 64, a blower 642 is fixedly installed on the inner wall of the partition 641, a hollow frame 644 is fixedly installed on the inner wall of the central square tube 64, a bent nozzle 645 is fixedly connected to the inner wall of the hollow frame 644, a barrier 646 is fixedly installed on the inner wall of the hollow frame 644, and two hollow A series of square tubes are fixedly connected between the frames 644, and an internally threaded tube 643 is fixedly connected to the top of the series of square tubes. The top of the internally threaded tube 643 extends to the top of the central square tube 64. The gooseneck rod 61 is pre-bent so that the hollow diverter tube 62 is located at the opening on the front of the combustion furnace body 1, and then the output pipe of the external oxygen generator is connected to the top of the internally threaded tube 643. The blower 642 is controlled to work, and air can be absorbed from the front of the central square tube 64 and input into the combustion chamber 2 through the air nozzle 63. At the same time, the external oxygen generator is controlled to work so that oxygen is evenly integrated into the above-mentioned air, thereby increasing the oxygen content in the inner cavity of the combustion chamber 2 and increasing the combustion rate and sufficiency of the fuel. Through the design of the air nozzle 63, air can be evenly blown into the combustion chamber 2.

[0047] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing steel bar oxidation and burning, characterized in that: The steel bar oxidation and burning preparation method comprises the following steps: S1. Billet selection: Select billets of appropriate specifications and inspect their quality. After passing the inspection, proceed with subsequent processing; S2. Cleaning of steel billets: Use a soft brush assembly to clean the outer surface of the steel billet to remove dust and impurities; S3. Low-loss heating of steel billets: add the steel billets into the preheating equipment, and then control the preheating equipment to preheat the steel billets with low oxidation and burning losses. After the preheating is completed, transfer them to a high-efficiency high-temperature furnace to melt and heat them; S4, casting and forming: pouring molten steel into a steel bar mold, and after cooling it to room temperature, demoulding it to obtain a steel bar blank; S5. Finishing treatment: grinding the steel bar blanks and recycling the debris generated by grinding; The preheating device comprises a combustion furnace body (1), a combustion chamber (2) is provided on the top of the combustion furnace body (1), a porous plate (3) located in the inner cavity of the combustion chamber (2) is detachably connected to the inner wall of the combustion furnace body (1), a lifting rod (4) is welded to the top of the combustion furnace body (1), a low burning loss mechanism (5) is provided on the top of the lifting rod (4), and a combustion acceleration mechanism (6) is provided on the front of the combustion furnace body (1); The low burning loss mechanism (5) comprises a heating furnace body (51) fixedly mounted on the top of the lifting rod (4); a hydraulic cylinder (52) is fixedly mounted on the left side of the heating furnace body (51); a fixed cylindrical member (53) is fixedly mounted on the movable end of the hydraulic cylinder (52); a cover plate (54) is rotatably connected to the outer wall of the fixed cylindrical member (53); ventilation holes (55) are provided on the front and back sides of the heating furnace body (51); a centralizing square tube (56) is fixedly connected to the front and back sides of the heating furnace body (51); a manual vent valve (57) is fixedly connected to the side of the centralizing square tube (56) away from the heating furnace body (51); and a support seat (59) is welded between the front and back sides of the inner wall of the heating furnace body (51); A rapid heat exchange bottom plate (58) is fixedly mounted on the inner wall of the heating furnace body (51), a graphite column (581) is fixedly mounted on the inner wall of the rapid heat exchange bottom plate (58), the top and bottom of the graphite column (581) respectively extend to the top and bottom of the rapid heat exchange bottom plate (58), a graphite block (582) is fixedly mounted on the inner wall of the rapid heat exchange bottom plate (58), and the top and bottom of the graphite block (582) are both fixedly connected to graphite fins (583).

2. The method for preparing steel bar oxidation and burning according to claim 1, characterized in that: A circulation square cylinder (511) is fixedly mounted on the right side of the inner wall of the heating furnace body (51), a cylindrical cavity (512) is provided on the left side of the circulation square cylinder (511), an air inlet hole (513) is provided on the outer wall of the circulation square cylinder (511), an extension shaft (514) is rotatably connected to the inner wall of the circulation square cylinder (511), an impeller (515) located in the inner cavity of the cylindrical cavity (512) is fixedly mounted on the left end of the extension shaft (514), and a connecting flange (516) located on the right side of the heating furnace body (51) is fixedly mounted on the right side of the extension shaft (514).

3. The method for preparing steel bar oxidation and burning according to claim 1, characterized in that: The combustion accelerating mechanism (6) comprises a gooseneck rod (61), the gooseneck rod (61) being fixedly connected to the front side of the combustion furnace body (1), a hollow diverter pipe (62) being fixedly mounted on one end of the gooseneck rod (61) away from the combustion furnace body (1), an air nozzle (63) being fixedly connected to the back side of the hollow diverter pipe (62), and a central square tube (64) being fixedly connected to the front side of the hollow diverter pipe (62).

4. The method for preparing steel bar oxidation and burning according to claim 3, characterized in that: A partition (641) is fixedly mounted on the inner wall of the central square tube (64), a blower (642) is fixedly mounted on the inner wall of the partition (641), a hollow frame (644) is fixedly mounted on the inner wall of the central square tube (64), and a bent nozzle (645) is fixedly connected to the inner wall of the hollow frame (644).

5. The method for preparing steel bar oxidation and burning according to claim 4, characterized in that: A blocking member (646) is fixedly mounted on the inner wall of the hollow frame (644), a connecting square tube is fixedly connected between the two hollow frames (644), an internally threaded tube (643) is fixedly connected to the top of the connecting square tube, and the top of the internally threaded tube (643) extends to the top of the central square tube (64).

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