A steelmaking furnace continuous charging preheating device and preheating method

Abstract

The present invention relates to the field of metallurgical technology, and in particular to a continuous charging and preheating device for a steelmaking furnace, the continuous charging and preheating device for a steelmaking furnace comprises a furnace body, a feeding structure and a preheating structure, a feeding port is arranged on the furnace body, a hopper is arranged at the feeding port position, the feeding structure comprises a vibrator and a feeding plate, a plurality of air guide tubes are arranged at intervals along the left and right directions on the feeding plate, a plurality of supporting members are arranged on the lower end face of the feeding plate, the supporting members comprise a fixing frame and a swinging rod, and the preheating structure comprises a wind hood covering the feeding plate and a fan arranged at the right end of the wind hood. When the continuous charging and preheating device for a steelmaking furnace of the present invention is in use, the vibrator drives the feeding plate to reciprocate left and right so that the feeding plate can continuously input scrap steel into the hopper, and at the same time the air guide tube can guide the smoke above the wind hood to the upper end face of the feeding plate, so that the smoke can be blown directly to the surface of the scrap steel, thereby improving the preheating effect and ensuring uniform preheating.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a continuous charging preheating device and a preheating method for a steelmaking furnace. Background Art

[0002] As we all know, scrap steel preheating is one of the development directions of energy-saving technology for electric arc furnace steelmaking. There are two main types of scrap steel preheating devices used in electric arc furnace steelmaking: vertical and horizontal. Although the vertical type has higher thermal efficiency and higher scrap steel preheating temperature, it requires a high elevation of the plant, large equipment, high one-time investment, and is not suitable for the transformation of old electric arc furnace steelmaking workshops; while the horizontal type scrap steel preheating device has attracted the attention of some companies because it does not have too high requirements for the height of the plant.

[0003] At present, the representative horizontal continuous feeding scrap steel preheating device is mainly the continuous steelmaking electric furnace (Consteel) introduced from abroad. However, its inherent disadvantages are: although its inventor Intel Steel believes that the Consteel process developed by the company can preheat scrap steel to about 500℃, the equipment supplier Italy Dexing Company also advertises that it can preheat scrap steel to 400℃~600℃, but the production practice of Kyoei Steel (i.e. Japan Kyoei Steel) Company shows that the scrap steel temperature after preheating is uneven (high on the top and low on the bottom), and the scrap steel temperature at 600mm~700mm from the surface is less than 100℃, and its energy saving effect is only 25kwh / t steel, and the heat transfer efficiency is very low. The production practice of Consteel electric furnace used in China also proves that the scrap steel preheating temperature of this equipment is low and the energy saving effect is poor.

[0004] A Chinese patent document with authorization announcement number CN109696052B discloses a combined continuous feeding device, which includes a preheating section, a conveying section and a feeding section which are sequentially connected outside a smelting furnace. However, when the preheating section is in use, since the fan needs to avoid the scrap steel, the high-temperature flue gas drawn by the fan is usually above the scrap steel, resulting in uneven preheating of the scrap steel and poor preheating effect. Summary of the invention

[0005] The present invention provides a continuous charging preheating device for a steelmaking furnace to solve the technical problem of uneven preheating of scrap steel in the prior art; the present invention also provides a preheating method to preheat the scrap steel.

[0006] In order to solve the above problems, the present invention provides a steelmaking furnace continuous charging preheating device adopts the following technical solution:

[0007] A continuous charging and preheating device for a steelmaking furnace comprises a furnace body, a feeding structure and a preheating structure, the furnace body is provided with a feeding port, a hopper is provided at the position of the feeding port, the hopper has a feeding channel and an exhaust channel arranged separately, the feeding structure comprises a vibrator and a feeding plate connected to the vibrator in a transmission manner, the length direction of the feeding plate is defined as the left and right direction, a plurality of air guide tubes are arranged at intervals along the left and right directions on the feeding plate, the air guide tube comprises a horizontal section and an inclined section connected to the right end of the horizontal section, the inclined section is arranged downwardly inclined from right to left, and the inner cavity of the inclined section is connected with the right end of the inner cavity of the horizontal section so that smoke can enter along the left end of the horizontal section and be discharged along the lower part of the inclined section, legs are provided at both front and rear ends below the inclined section, the legs are connected to the feeding plate, a plurality of support members are provided on the lower end surface of the feeding plate, the support members comprise a fixed frame and a swing rod, the swing rod can swing in the left and right directions and is arranged on the fixed frame; the preheating structure comprises a hood covering the feeding plate and a fan arranged at the right end of the hood

[0008] The beneficial effect is: when the continuous feeding and preheating device of a steelmaking furnace of the present invention is in use, scrap steel is first added to the upper end surface of the loading plate, and then the fan draws out the flue gas in the furnace body and the flue gas moves to the right, and at the same time, the loading plate is driven to move to the left by the vibrator. At this time, the loading plate moves to the left so that the flue gas at the upper end of the wind hood enters the air guide tube along the left side of the horizontal section and hits the right side wall of the upper end of the inclined section, and then the vibrator drives the loading plate to move to the right again. At this time, the flue gas moves downward under the guidance of the left side wall of the inclined section until it moves to the bottom and is discharged and blown onto the scrap steel on the upper end surface of the loading plate. The vibrator repeatedly drives the loading plate to move in the left and right directions, so that the scrap steel can move forward into the hopper, and at the same time, the flue gas at the upper end of the wind hood can be continuously transported to the upper end surface of the loading plate, thereby fully preheating the scrap steel. When the continuous charging and preheating device for a steelmaking furnace of the present invention is in use, the vibrator drives the loading plate to move back and forth so that the loading plate can continuously input scrap steel into the hopper. At the same time, the air guide tube can guide the smoke above the wind cover to the upper end surface of the loading plate, so that the smoke can be directly blown to the surface of the scrap steel, thereby improving the preheating effect and ensuring uniform preheating.

[0009] Furthermore, the fixing frame is a rectangular frame structure, the fixing frame has an inner cavity and an upper wall, and a long swing hole is opened on the upper wall. The long swing hole penetrates the upper wall in the up and down directions. The swing center of the swing rod is located in the long swing hole and the swing rod cooperates with the long swing hole guide when swinging.

[0010] Beneficial effects: simple structure and easy installation.

[0011] Furthermore, an upper swing seat and a lower swing seat are respectively provided on the upper and lower sides of the upper wall, and the long swing hole penetrates the upper swing seat and the lower swing seat in the up and down directions. The upper end face of the upper swing seat is an arc-shaped groove, and the lower end face of the lower swing seat is also an arc-shaped groove. The upper swing part and the lower swing part are detachably connected to the swing rod, and the lower end face of the upper swing part is an arc-shaped surface adapted to the upper end face of the upper swing seat, and the upper end face of the lower swing part is an arc-shaped surface adapted to the lower end face of the lower swing seat.

[0012] Beneficial effect: the swing rod swings stably and is convenient for disassembly of the swing rod.

[0013] Furthermore, the swing rod is a threaded rod, and the lower swing member includes a lower swing block which is sleeved on the swing rod and has a hemispherical structure, and a lower fixing nut which is arranged below the lower swing block, and the lower fixing nut is used to fix the lower swing block in the arc-shaped groove of the lower swing seat.

[0014] Beneficial effects: simple structure, easy to disassemble and install.

[0015] Furthermore, the upper swing member includes an upper swing block which is sleeved on the swing rod and has a hemispherical structure, and an upper fixing nut which is arranged above the upper swing block. The upper fixing nut is used to fix the upper swing block in the arc groove of the upper swing seat.

[0016] Beneficial effects: The structure is simple and the height of the loading plate can be easily adjusted, so it is easy to adapt to different types of hoppers and furnace bodies.

[0017] Furthermore, stop plates are provided on both the front and rear sides of the loading plate, and the stop plates are used to stop the materials on the loading plate, and the supporting legs are arranged on the stop plates on the corresponding sides.

[0018] Beneficial effect: Avoid scrap steel from falling.

[0019] Furthermore, a plurality of rotation grooves are provided on the side wall of the inclined section on the left side, and an auxiliary plate is rotatably mounted in each rotation groove. When the inclined section is in the initial position, the auxiliary plate abuts against the lower groove wall of the rotation groove.

[0020] Beneficial effect: Through the gravity and inertia of the auxiliary plate, the auxiliary plate can fan the smoke in the inclined section downward, thereby improving the efficiency of blowing the smoke to the surface of the scrap steel.

[0021] Furthermore, a rotating shaft is fixedly arranged in the rotating groove, and the auxiliary plate is rotatably assembled on the rotating shaft.

[0022] Beneficial effects: simple structure, easy maintenance, not easy to damage.

[0023] Furthermore, a water cooling groove, a water inlet for inputting cold water into the water cooling groove, and a water outlet for outputting water in the water cooling groove are provided on the outer wall of the hopper, and a wear-resistant steel plate is provided on the inner wall of the feed channel.

[0024] Beneficial effect: Increase hopper life.

[0025] In order to solve the above problems, the present invention provides a preheating method adopting the following technical solution:

[0026] A preheating method uses a steelmaking furnace continuous charging preheating device as described in any one of claims 1 to 9 to preheat the scrap steel by extracting the flue gas in the furnace body and blowing it onto the surface of the scrap steel.

[0027] The beneficial effect is that when a preheating method of the present invention is used, the high-temperature flue gas generated in the furnace is extracted and blown to the surface of the scrap steel, so that the scrap steel is preheated evenly and the preheating effect is guaranteed. At the same time, the high-temperature flue gas is recovered and utilized, thereby reducing energy consumption and saving money. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0029] Figure 1 It is a structural schematic diagram of a continuous charging and preheating device for a steelmaking furnace of the present invention;

[0030] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0031] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0032] Figure 4 A top view of a continuous charging and preheating device for a steelmaking furnace according to the present invention;

[0033] Figure 5 It is a schematic diagram of the connection between a loading plate and an air guide cover of a continuous charging and preheating device for a steelmaking furnace of the present invention;

[0034] Figure 6 It is a cross-sectional view of a loading plate and an air guide cover of a continuous charging and preheating device for a steelmaking furnace of the present invention;

[0035] Figure 7 for Figure 6 Enlarged schematic diagram at point C in the middle.

[0036] Description of reference numerals:

[0037] 1. Furnace body; 2. Loading structure; 3. Preheating structure; 4. Hopper; 5. Vibrator; 6. Loading plate; 7. Air guide tube; 8. Legs; 9. Fixed frame; 10. Swing rod; 11. Wind hood; 12. Fan; 13. Upper swing seat; 14. Lower swing seat; 15. Lower swing block; 16. Lower fixing nut; 17. Upper swing block; 18. Upper fixing nut; 19. Stop plate; 20. Rotating groove; 21. Auxiliary plate; 22. Rotating shaft; 23. Horizontal section; 24. Inclined section; 25. Feed channel; 26. Exhaust channel; 27. Water inlet; 28. Water outlet. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0040] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0041] Embodiment 1 of a continuous charging and preheating device for a steelmaking furnace provided by the present invention:

[0042] like Figures 1 to 7 As shown, a continuous charging and preheating device for a steelmaking furnace of the present invention comprises a furnace body 1, a charging structure 2 and a preheating structure 3.

[0043] like Figure 1 and, Figure 4 As shown, a feed port is provided on the furnace body 1 , a hopper 4 is provided at the feed port, a partition is provided inside the hopper 4 to divide the inner cavity of the hopper 4 into a feed channel 25 and an exhaust channel 26 , and a wear-resistant steel plate is provided on the inner wall of the feed channel 25 .

[0044] In this embodiment, in order to prevent the hopper 4 from being damaged by excessive temperature, Figure 3 As shown, a water cooling groove, a water inlet 27 for inputting cold water into the water cooling groove, and a water outlet 28 for outputting water in the water cooling groove are provided on the outer side wall of the hopper 4.

[0045] The feeding structure 2 includes an exciter 5 and a feeding plate 6. The length direction of the feeding plate 6 is defined as the left-right direction. The left end of the feeding plate 6 is arranged corresponding to the above-mentioned feeding channel so that the scrap steel on the feeding plate 6 can enter the furnace body 1 through the feeding channel.

[0046] The right end of the loading plate 6 is transmission-connected to the output end of the vibration exciter 5 , so that the vibration exciter 5 can drive the loading plate 6 to reciprocate in the left-right direction.

[0047] like Figure 1 and Figure 2 As shown, a plurality of support members are disposed on the lower end surface of the loading plate 6 , and the support members include a fixing frame 9 and a swing rod 10 . The swing rod 10 can swing in the left and right directions and is disposed on the fixing frame 9 .

[0048] The fixing frame 9 is a rectangular frame structure, and the fixing frame 9 has an inner cavity and an upper wall. An upper swing seat 13 is provided on the upper side surface of the upper wall, and the upper end surface of the upper swing seat 13 is an arc-shaped groove. A lower swing seat 14 is provided on the lower side surface of the upper wall, and the lower end surface of the lower swing seat 14 is also an arc-shaped groove.

[0049] A long swing hole is also provided on the upper wall, and the long swing hole penetrates the upper swing seat 13 and the lower swing seat 14 in the up-down direction.

[0050] The swing rod 10 is a threaded rod, and the size of the swing rod 10 is smaller than the swing long hole so that the swing rod 10 can swing in the left-right direction in the swing long hole.

[0051] An upper swinging member and a lower swinging member are detachably connected to the swinging rod 10 .

[0052] The upper swing member includes an upper swing block 17 which is sleeved on the swing rod 10 and has a hemispherical structure, and an upper fixing nut 18 which is arranged above the upper swing block 17. The lower end surface of the upper swing block 17 is adapted to the upper end surface of the upper swing seat 13 so that the upper swing block 17 can slide within the upper end surface of the upper swing seat 13.

[0053] The upper fixing nut 18 is threadedly connected to the swing rod 10 to fix the upper swing block 17 in the arc-shaped groove of the upper swing seat 13 , so that the upper swing block 17 is tightly attached to the arc-shaped groove of the upper swing seat 13 .

[0054] The lower swing member includes a lower swing block 15 which is sleeved on the swing rod 10 and has a hemispherical structure, and a lower fixing nut 16 which is arranged below the lower swing block 15. The upper end surface of the lower swing block 15 is adapted to the lower end surface of the lower swing seat 14 so that the lower swing block 15 can slide within the lower end surface of the lower swing seat 14.

[0055] The lower fixing nut 16 is threadedly connected to the swing rod 10 to fix the lower swing block 15 in the arc-shaped groove of the lower swing seat 14 , so that the lower swing block 15 is tightly attached to the arc-shaped groove of the lower swing seat 14 .

[0056] like Figure 5 and Figure 6 As shown, stop plates 19 are provided on both the front and rear sides of the loading plate 6 , and the stop plates 19 are used to stop the materials on the loading plate 6 .

[0057] A plurality of air guide tubes 7 are arranged at intervals along the left-right direction on the loading plate 6, and the air guide tubes 7 include a horizontal section 23 and an inclined section 24 connected to the right end of the horizontal section 23. The inclined section 24 is arranged to tilt downward from right to left, and the inner cavity of the inclined section 24 is connected to the right end of the inner cavity of the horizontal section 23 so that smoke can enter along the left end of the horizontal section 23 and be discharged along the bottom of the inclined section 24. Support legs 8 are provided at the front and rear ends below the inclined section 24, and the support legs 8 are fixed on the stop plates 19 on the front and rear sides of the loading plate 6.

[0058] like Figure 7 As shown, a plurality of rotating grooves 20 are opened on the side wall of the inclined section 24 on the left side, each rotating groove 20 is fixed with a rotating shaft 22, and an auxiliary plate 21 is rotatably mounted on each rotating shaft 22. When the inclined section 24 is in the initial position, the auxiliary plate 21 abuts against the lower groove wall of the rotating groove 20.

[0059] The preheating structure 3 includes a hood 11 covering the loading plate 6 and a fan 12 arranged at the right end of the hood 11. The horizontal section 23 is located at the upper side of the hood 11, and the left end of the hood 11 is connected to the exhaust passage.

[0060] When a continuous charging and preheating device for a steelmaking furnace of the present invention is in use, scrap steel is first added to the upper end surface of the loading plate 6, and then the fan 12 draws out the flue gas in the furnace body 1 and the flue gas moves to the right, and at the same time, the loading plate 6 is driven to move to the left through the vibrator 5. At this time, the loading plate 6 moves to the left, so that the flue gas at the upper end of the wind hood 11 enters the air guide tube 7 along the left side of the horizontal section 23 and hits the right side wall of the upper end of the inclined section 24, and then the vibrator 5 drives the loading plate 6 to move to the right again. At this time, the flue gas moves downward under the guidance of the left side wall of the inclined section 24 until it moves to the bottom and is discharged and blown onto the scrap steel on the upper end surface of the loading plate 6. The vibrator 5 repeatedly drives the loading plate 6 to move back and forth in the left and right directions, so that the scrap steel can move forward into the hopper 4, and at the same time, the flue gas at the upper end of the wind hood 11 can be continuously transported to the upper end surface of the loading plate 6, thereby fully preheating the scrap steel.

[0061] When the continuous charging and preheating device for a steelmaking furnace of the present invention is in use, the vibrator drives the loading plate to move back and forth so that the loading plate can continuously input scrap steel into the hopper. At the same time, the air guide tube can guide the smoke above the wind cover to the upper end surface of the loading plate, so that the smoke can be directly blown to the surface of the scrap steel, thereby improving the preheating effect and ensuring uniform preheating.

[0062] Embodiment 2 of a continuous charging and preheating device for a steelmaking furnace provided by the present invention:

[0063] The main difference between it and Example 1 is:

[0064] In Example 1, the fixing frame is a rectangular frame structure, the fixing frame has an inner cavity and an upper wall, and a long swing hole is opened on the upper wall. The long swing hole passes through the upper wall in the up and down directions, and the center of the swing rod is rotatably assembled in the long swing hole.

[0065] In this embodiment, the lower end of the swing rod is hinged to the upper end surface of the fixing frame.

[0066] Embodiment 3 of a continuous charging and preheating device for a steelmaking furnace provided by the present invention:

[0067] The main difference between it and Example 1 is:

[0068] In Example 1, an upper swing seat and a lower swing seat are respectively provided on the upper and lower sides of the upper wall, and the long swing hole penetrates the upper swing seat and the lower swing seat in the up and down directions. The upper end face of the upper swing seat is an arc-shaped groove, and the lower end face of the lower swing seat is also an arc-shaped groove. The upper swing part and the lower swing part are detachably connected to the swing rod, and the lower end face of the upper swing part is an arc-shaped surface adapted to the upper end face of the upper swing seat, and the upper end face of the lower swing part is an arc-shaped surface adapted to the lower end face of the lower swing seat.

[0069] In this embodiment, a rotating rod extending in the front-rear direction and fixed in the long swing hole is provided in the long swing hole, and the swing rod is rotatably assembled on the rotating rod.

[0070] Embodiment 4 of a continuous charging and preheating device for a steelmaking furnace provided by the present invention:

[0071] The main difference between it and Example 1 is:

[0072] In Example 1, the lower swing member includes a lower swing block which is sleeved on the swing rod and has a hemispherical structure, and a lower fixing nut which is arranged below the lower swing block. The lower fixing nut is used to fix the lower swing block in the arc-shaped groove of the lower swing seat.

[0073] In this embodiment, the lower fixing nut is not provided. In this case, a threaded hole adapted to the swing rod is provided on the lower swing block, and the lower swing block is threadedly connected to the swing rod.

[0074] Embodiment 5 of a continuous charging and preheating device for a steelmaking furnace provided by the present invention:

[0075] The main difference between it and Example 1 is:

[0076] In Example 1, the upper swing member includes an upper swing block which is sleeved on the swing rod and has a hemispherical structure, and an upper fixing nut which is arranged above the upper swing block. The upper fixing nut is used to fix the upper swing block in the arc-shaped groove of the upper swing seat.

[0077] In this embodiment, no upper fixing nut is provided. In this case, a threaded hole adapted to the swing rod is provided on the upper swing block, and the upper swing block is threadedly connected to the swing rod.

[0078] Embodiment 1 of a preheating method provided by the present invention:

[0079] A preheating method of the present invention uses a steelmaking furnace continuous charging preheating device described in any of the above embodiments. When in use, the preheating method of the present invention preheats the scrap steel by extracting the flue gas in the furnace body and blowing it onto the surface of the scrap steel.

[0080] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0081] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

[0082] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A continuous charging and preheating device for a steelmaking furnace, comprising a furnace body, a charging structure and a preheating structure, wherein a feeding port is provided on the furnace body, and the characteristics are as follows: A hopper is provided at the feed inlet, and the hopper has a feed channel and an exhaust channel arranged separately. The feeding structure includes a vibrator and a feeding plate connected to the vibrator in a transmission manner. The length direction of the feeding plate is defined as the left-right direction. A plurality of air guide tubes are arranged at intervals along the left-right direction on the feeding plate. The air guide tube includes a horizontal section and an inclined section connected to the right end of the horizontal section. The inclined section is arranged downwardly inclined from right to left, and the inner cavity of the inclined section is connected to the right end of the inner cavity of the horizontal section so that smoke can enter along the left end of the horizontal section and be discharged along the lower part of the inclined section. Support legs are provided at both front and rear ends below the inclined section, and the support legs are connected to the feeding plate. A plurality of support members are provided on the lower end surface of the feeding plate, and the support members include a fixed frame and a swing rod. The swing rod can swing in the left-right direction and is provided on the fixed frame. The preheating structure includes a wind hood covering the feeding plate and a fan provided at the right end of the wind hood. The fixing frame is a rectangular frame structure, the fixing frame has an inner cavity and an upper wall, and a swinging long hole is opened on the upper wall. The swinging long hole penetrates the upper wall in the up and down directions. The swinging center of the swinging rod is located in the swinging long hole and the swinging rod cooperates with the swinging long hole guide when swinging.

2. A steelmaking furnace continuous charging preheating device according to claim 1, characterized in that: An upper swing seat and a lower swing seat are respectively provided on the upper and lower sides of the upper wall, and the long swing hole penetrates the upper swing seat and the lower swing seat in the up and down directions. The upper end face of the upper swing seat is an arc-shaped groove, and the lower end face of the lower swing seat is also an arc-shaped groove. The upper swing member and the lower swing member are detachably connected to the swing rod, and the lower end face of the upper swing member is an arc-shaped surface adapted to the upper end face of the upper swing seat, and the upper end face of the lower swing member is an arc-shaped surface adapted to the lower end face of the lower swing seat.

3. A steelmaking furnace continuous charging preheating device according to claim 2, characterized in that: The swing rod is a threaded rod, and the lower swing member includes a lower swing block which is sleeved on the swing rod and has a hemispherical structure, and a lower fixing nut which is arranged below the lower swing block. The lower fixing nut is used to fix the lower swing block in the arc groove of the lower swing seat.

4. A steelmaking furnace continuous charging preheating device according to claim 3, characterized in that: The upper swing member comprises an upper swing block which is sleeved on the swing rod and is a hemispherical structure, and an upper fixing nut which is arranged above the upper swing block. The upper fixing nut is used to fix the upper swing block in the arc groove of the upper swing seat.

5. A continuous charging and preheating device for a steelmaking furnace according to any one of claims 1 to 4, characterized in that: Stop plates are provided on both the front and rear sides of the loading plate, and the stop plates are used to stop the materials on the loading plate, and the supporting legs are arranged on the stop plates on the corresponding sides.

6. A steelmaking furnace continuous charging preheating device according to claim 5, characterized in that: A plurality of rotating grooves are provided on the side wall of the inclined section on the left side, and an auxiliary plate is rotatably mounted in each rotating groove. When the inclined section is in the initial position, the auxiliary plate abuts against the lower groove wall of the rotating groove.

7. A steelmaking furnace continuous charging preheating device according to claim 6, characterized in that: A rotating shaft is fixedly arranged in the rotating groove, and the auxiliary plate is rotatably assembled on the rotating shaft.

8. A continuous charging and preheating device for a steelmaking furnace according to any one of claims 1 to 4, characterized in that: A water cooling groove, a water inlet for inputting cold water into the water cooling groove, and a water outlet for outputting water in the water cooling groove are provided on the outer wall of the hopper, and a wear-resistant steel plate is provided on the inner wall of the feed channel.

9. A preheating method, using a steelmaking furnace continuous charging preheating device according to any one of claims 1 to 8, characterized in that: The scrap steel is preheated by extracting the flue gas in the furnace and blowing it onto the surface of the scrap steel.

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