Steel scrap feeding device and steel scrap feeding preheating system

Abstract

The invention relates to a scrap steel feeding device and a scrap steel feeding preheating system adopting the scrap steel feeding device.The scrap steel feeding device comprises a feeding rotary table and a sealing smoke hood, the feeding rotary table comprises a center rotary shaft and a plurality of material separation radial plates, and the material separation radial plates are connected to the center rotary shaft and extend outwards in a radial shape; a stock bin is defined between every two adjacent material separation radial plates, and a rotating shaft of the center rotating shaft is axially parallel to the horizontal plane and is connected with a rotating disc driving unit used for driving the rotating shaft to rotate. The sealing smoke hood covers the feeding rotary disc, the bottom of the sealing smoke hood is open, and a waste steel inlet and a smoke outlet are formed in the top of the sealing smoke hood. The feeding rotary disc and the sealing smoke hood are coupled to form the waste steel feeding device, and the problems that waste steel is preheated unevenly in horizontal feeding and the finger failure rate of the shaft furnace is high can be solved; smoke ascends in the sealing smoke hood and the feeding rotary disc and penetrates through waste steel materials accumulated in the stock bin, comprehensive relative flow of the smoke and the waste steel materials is achieved, waste steel is preheated in a penetrating mode in the vertical dimension, and the preheating temperature of the waste steel materials is greatly increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric furnace steelmaking, and particularly relates to a scrap steel feeding device and a scrap steel feeding and preheating system adopting the same. BACKGROUND

[0002] Although great progress has been made in electric arc furnace steelmaking technology in recent years, the overall smelting comprehensive energy consumption is still high. Since the flue gas temperature of the electric arc furnace can reach about 1300 DEG C, the heat taken away with the flue gas sensible heat accounts for as much as 13% to 20% of the total input heat; and theoretically, the electric energy can be saved by 20 kWh / t of steel for each 100 DEG C increase in the scrap steel preheating temperature. In addition to saving energy and reducing consumption, scrap steel preheating can also shorten the smelting cycle and improve the production rate. Therefore, the scrap steel is usually preheated by using the flue gas of the electric furnace.

[0003] At present, the relatively advanced scrap steel preheating technologies mainly include the finger shaft furnace type scrap steel preheating and the Consteel type electric arc furnace scrap steel preheating method. The finger shaft furnace type scrap steel preheating is to directly install a shaft furnace above the side of the electric furnace, and the flue gas discharged from the electric arc furnace directly passes through the fingers to preheat the scrap steel accumulated thereon, thereby ensuring the full utilization of the exhaust heat and recycling 60% to 70% of the waste gas heat. The Consteel type electric arc furnace scrap steel preheating is to continuously preheat the furnace charge in the horizontal conveying process by using the flue gas of the electric furnace, so that the temperature of the scrap steel before entering the furnace can reach 100 DEG C to 200 DEG C. The preheated waste gas enters the waste heat recovery system through the combustion chamber, realizing continuous preheating, continuous charging and continuous melting of the scrap steel and improving the production rate. However, the above two kinds of scrap steel preheating methods also have their own defects that cannot be solved. In the finger shaft furnace scrap steel preheating, the fingers are often subjected to high-temperature flue gas and high-intensity heat radiation of the molten steel for a long time, and the scrap steel has a heavy impact load on the fingers during charging, which often causes the equipment failure of finger steel clamping and sticking, resulting in the need for production stoppage for cleaning and seriously affecting the production efficiency. Meanwhile, the fingers and the shaft furnace are both water-cooled, and once water leakage occurs, there is a risk of explosion. Although the Consteel type scrap steel preheating method rarely causes the risk of steel clamping, the high-temperature flue gas passes through the surface of the scrap steel layer, and the scrap steel at the bottom is basically not preheated, so that the average temperature of the scrap steel is low and the flue gas preheating utilization efficiency is low. SUMMARY

[0004] The present application relates to a scrap steel feeding device and a scrap steel feeding and preheating system adopting the same, which can at least solve some defects of the prior art.

[0005] The present application relates to a scrap steel feeding device, which comprises a feeding turntable and a sealing smoke hood,

[0006] The feeding rotary disc comprises a central rotating shaft and a plurality of material separating spokes, each of the material separating spokes is connected to the central rotating shaft and extends radially outward, a material bin is formed between each two adjacent material separating spokes, and the rotating shaft of the central rotating shaft is parallel to the horizontal plane and is connected to a rotary disc driving unit for driving rotation.

[0007] The sealing fume cover covers the feeding rotary disc, the bottom of the sealing fume cover is open, and the top of the sealing fume cover is provided with a scrap steel inlet and a fume outlet.

[0008] As one of the embodiments, the sealing fume cover comprises a fume cover top plate, two first fume cover side plates arranged in parallel and two second fume cover side plates arranged in parallel, the plate surface of the first fume cover side plates is perpendicular to the axis of the central rotating shaft, and the two transverse ends of the material separating spokes are in clearance fit with the two first fume cover side plates, respectively.

[0009] As one of the embodiments, a fume passing channel is arranged on the material separating spoke.

[0010] As one of the embodiments, a material limiting plate is arranged at the bottom of the sealing fume cover, the material limiting plate is arranged at the rotary disc discharging position and extends inwardly in the cover cavity to the rotary track close to the radial outer end of the material separating spoke.

[0011] As one of the embodiments, the radial outer end of each material separating spoke is provided with a material scraping plate, the material scraping plate extends outwardly from the plate surface of the material separating spoke along the rotary disc rotating direction.

[0012] As one of the embodiments, the scrap steel inlet and the rotary disc discharging position are located on the two sides of the reference surface of the vertical symmetry surface of the feeding rotary disc, respectively, and the fume outlet and the scrap steel inlet are located on the two sides of the reference surface, respectively.

[0013] As one of the embodiments, a flow limiting plate is arranged on the inner wall of the cover top of the sealing fume cover, the flow limiting plate has an arc-shaped flow limiting surface facing the feeding rotary disc, and the curvature of the arc-shaped flow limiting surface is close to the rotary track of the radial outer end of the material separating spoke.

[0014] As one of the embodiments, a dynamic sealing plate is arranged at the scrap steel inlet.

[0015] The application also relates to a scrap steel feeding and preheating system, which comprises a feeder, a feeding trolley for connecting with a feeding opening of a furnace body, a horizontal feeding chute connected with the feeding trolley, a protective fume cover arranged on the horizontal feeding chute, a scrap steel feeding device as described above, an inlet arranged on the protective fume cover, an open bottom end of the sealing fume cover in butt joint with the inlet, and a material outlet of the feeder in butt joint with the scrap steel inlet.

[0016] The application has at least the following beneficial effects:

[0017] The application adopts the coupling of the charging rotary disc and the sealing smoke cover to form a scrap steel charging device, which can solve the problem of uneven preheating of horizontal charging scrap steel, and solve the problem of high failure rate of the finger of the shaft furnace; the flue gas rises in the sealing smoke cover and the charging rotary disc, penetrates the scrap steel in the stock bin, realizes the overall relative flow of the flue gas and the scrap steel, realizes the penetration type preheating of the vertical dimension of the scrap steel, greatly improves the preheating temperature of the scrap steel, reduces the input of the electric energy in the furnace, and reduces the cost and increases the benefit. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 The structural schematic diagram of the scrap steel charging preheating system provided by the embodiment of the present application is shown in the figure.

[0020] Figure 2 The structural schematic diagram of the scrap steel charging device provided by the embodiment of the present application is shown in the figure.

[0021] Figure 3 The sectional view of the scrap steel charging device is shown in the figure.

[0022] Figure 4 The structural schematic diagram of the scrap steel preheating device provided by the embodiment of the present application is shown in the figure.

[0023] Figure 5 The sectional view of the scrap steel preheating device provided by the embodiment of the present application is shown in the figure.

[0024] Figure 6 The relative position schematic diagram of the feeding groove, the inner groove and the discharging groove is shown in the figure.

[0025] Figure 7 The scrap steel overturning schematic diagram in the rotary cylinder is shown in the figure. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] Embodiment one: as Figure 2 and Figure 3The embodiment of the present application provides a scrap steel feeding device 1, which comprises a feeding turntable 11 and a sealed fume cover 12,

[0028] The feeding turntable 11 comprises a central rotating shaft 111 and a plurality of material separating radial plates 112, each of the material separating radial plates 112 is connected to the central rotating shaft 111 and extends radially outward, a material bin is formed between each two adjacent material separating radial plates 112, and the rotating shaft of the central rotating shaft 111 is parallel to the horizontal plane and is connected with a turntable driving unit 114 for driving the rotation thereof.

[0029] The sealed fume cover 12 covers the feeding turntable 11, the bottom of the sealed fume cover 12 is open, and the top of the sealed fume cover 12 is provided with a scrap steel inlet 101 and a fume outlet 102.

[0030] Preferably, the sealed fume cover 12 comprises a fume cover top plate 121, two first fume cover side plates 122 arranged in parallel and two second fume cover side plates 123 arranged in parallel, wherein the plate surface of the first fume cover side plate 122 is perpendicular to the axis of the central rotating shaft 111, and the plate surface of the second fume cover side plate 123 is parallel to the axis of the central rotating shaft 111.

[0031] Optionally, as Figure 2 The scrap steel inlet 101 is arranged on one of the second fume cover side plates 123; the scrap steel inlet 101 is preferably arranged at the upper portion of the sealed fume cover 12, so that the scrap steel 6 can enter the feeding turntable 11, and therefore, the scrap steel inlet 101 is arranged at the upper portion of the second fume cover side plate 123.

[0032] Preferably, as Figure 2 A guide plate (not shown) is arranged at the bottom end of the scrap steel inlet 101 and extends into the cover cavity of the sealed fume cover 12, so that the scrap steel 6 can be better guided into the feeding turntable 11.

[0033] In one embodiment, as Figure 2 A dynamic sealing plate 1011 is arranged at the scrap steel inlet 101 and used for dynamically sealing the scrap steel inlet 101, so as to reduce the entry of external gas into the sealed fume cover 12; the dynamic sealing plate 1011 is movably arranged at the scrap steel inlet 101, so as to realize dynamic sealing and ensure that the dynamic sealing plate 1011 is in contact with the upper surface of the scrap steel flow at any time during feeding, so that a better sealing effect can be achieved; for example, the dynamic sealing plate 1011 is hingedly arranged at the top end of the scrap steel inlet 101, the scrap steel flow can push the dynamic sealing plate 1011 open, and the dynamic sealing plate 1011 can also close the scrap steel inlet 101 due to self-weight when there is no flow.

[0034] In one embodiment, as Figure 3The two lateral ends of the material separation spoke 112 are respectively gap-fitted with the two first smoke cover side plates 122, which not only ensures smooth rotation of the feeding turntable 11, but also provides an upward channel for the smoke below.

[0035] In another embodiment, the two lateral ends of the material bin are blocked by end plates, which can reduce the risk of blocking of the scrap steel 6. In this scheme, a smoke passing channel 1121 can be provided on the end plate, which can be a hole channel, a slot channel, etc.

[0036] As a preferred, as Figure 3 A smoke passing channel 1121 can be provided on the material separation spoke 112, which can be a hole channel, a slot channel, etc. By providing the smoke passing channel 1121 on the material separation spoke 112, the heat exchange effect and efficiency of the smoke and the scrap steel 6 can be improved when the feeding turntable 11 transports the scrap steel 6.

[0037] The material separation spoke 112 is preferably extended outward along the radial direction of the central rotating shaft 111, that is, extended away from the central rotating shaft 111. The central angle / dihedral angle defined between adjacent material separation spokes 112 is preferably the same. In addition, the extension length of each material separation spoke 112 is preferably the same, that is, the radial outer ends of each material separation spoke 112 are distributed in a circle, so that the volume of each material bin is the same.

[0038] The amount of scrap steel contained in the material bin can be controlled by the rotating speed of the feeding turntable 11. In addition, the number and volume of the material bins can be designed according to the demand of the electric arc furnace scrap steel material.

[0039] Preferably, as Figure 3 The two ends of the central rotating shaft 111 respectively pass through the two first smoke cover side plates 122 to connect the turntable driving unit 114. The above-mentioned turntable driving unit 114 can adopt a motor or other driving device, which can be connected with the central rotating shaft 111 through a shaft coupling. Alternatively, the two ends of the central rotating shaft 111 are respectively connected with a set of driving devices, which can ensure the power required for the rotation of the feeding turntable 11.

[0040] Each radial outer end of the material separation spoke 112 has a rotating track, which is defined as the turntable rotating track for convenience of description.

[0041] When the guide plate is provided, the guide plate is close to the above-mentioned turntable rotating track.

[0042] Two second fume hood side plates 123 are preferably tangent to the rotating track of the rotating disc, or close to the rotating track of the rotating disc, for example, in clearance fit with the rotating track of the rotating disc (i.e. in clearance fit with the material isolation spoke 112 rotating to the position), so that the second fume hood side plates 123 can limit the material bin rotating to the position (e.g. the material bin rotating to the horizontal position) to prevent the scrap steel 6 from falling out of the material bin.

[0043] With the rotation of the material loading rotating disc 11, it receives the scrap steel 6 from the scrap steel inlet 101, and then rotates to the position where the opening of the material bin faces downward for unloading, so that it has a rotating disc unloading position 103.

[0044] Preferably, as Figure 2 With the vertical symmetry plane of the material loading rotating disc 11 as the reference plane, the scrap steel inlet 101 and the rotating disc unloading position 103 are respectively located on the two sides of the reference plane, which can prolong the residence time of the scrap steel 6 in the material loading rotating disc 11, thereby improving the preheating effect of the flue gas on the scrap steel 6. For the case where the scrap steel inlet 101 is arranged on the second fume hood side plate 123, the rotation of the material loading rotating disc 11 is used to drive the material bin currently receiving the scrap steel 6 to swing upward instead of downward, i.e. to make the scrap steel inlet 101 and the rotating disc unloading position 103 respectively located on the two sides of the reference plane; the rotating disc unloading position 103 is close to the other second fume hood side plate 123.

[0045] Preferably, as Figure 2 The flue gas outlet 102 and the scrap steel inlet 101 are respectively located on the two sides of the reference plane, which makes the flue gas outlet 102 and the scrap steel inlet 101 away from each other, and also improves the preheating effect of the flue gas on the scrap steel 6.

[0046] Optionally, as Figure 2 The flue gas outlet 102 is arranged on the fume hood top plate 121 adjacent to the other second fume hood side plate 123.

[0047] As a preferred solution, as Figure 2 A material limiting plate 124 is arranged at the bottom of the sealing fume hood 12, and the material limiting plate 124 is arranged at the rotating disc unloading position 103 and extends inward to the fume chamber to be close to the rotating track of the rotating disc.

[0048] The material limiting plate 124 is mainly used for limiting the scrap steel 6 in the bunker when the material limiting plate 124 rotates to the unloading position 103 of the rotary table, so that the bunker can be continuously and relatively small-flow unloaded. The material limiting plate 124 has a material limiting surface, which is close to the rotary track of the rotary table, and therefore, the material limiting surface is preferably an arc surface, which can be coaxial with the radial outer end of the material separating spoke 112, and the distance between the arc surface and the axis of the central rotating shaft 111 can be slightly larger than the radius of the rotary track of the rotary table (i.e. the distance between the radial outer end of the material separating spoke 112 and the axis of the central rotating shaft 111). For example, the material limiting surface and the rotary track of the rotary table are in clearance fit (i.e. in clearance fit with the material separating spoke 112 rotating to the unloading position 103).

[0049] Preferably, the material limiting plate 124 is installed on the second fume hood side plate 123, which is convenient to install. Preferably, the material limiting plate 124 is detachably installed on the second fume hood side plate 123, because it bears more scrap steel abrasion, so this way can facilitate its replacement and maintenance. It can be seen that for the case that the second fume hood side plate 123 limits the scrap steel 6 in the bunker, the material limiting plate 124 increases the limiting range of the second fume hood side plate 123 to the material loading rotary table 11 and prolongs the limiting time.

[0050] In one embodiment, as Figure 2 The radial outer end of each material separating spoke 112 is provided with a material scraping plate 113, which extends forwardly from the plate surface of the material separating spoke 112 in the rotary direction of the rotary table; and the outer plate surface of the material scraping plate 113 is preferably an arc plate surface coaxial with the rotary track of the rotary table.

[0051] When the material loading rotary table 11 rotates to the unloading position 103 of the rotary table to start unloading, the scrap steel 6 continuously falls from the bunker, and at the same time, the material loading rotary table 11 continuously rotates. When the scrap steel 6 accumulates below the material limiting plate 124, the material scraping plate 113 can limit the remaining material in the bunker from falling below the material limiting plate 124, or in other words, the material scraping plate 113 pushes the accumulated scrap steel 6 to the rear side, so that the scrap steel 6 falling below the material loading rotary table 11 is limited in height and is pushed and leveled, thereby ensuring the reliability of the scrap steel 6 loading.

[0052] In one embodiment, as Figure 2The inner wall of the sealed fume hood 12 is provided with a flow-limiting plate 125. The flow-limiting plate 125 has an arc-shaped flow-limiting surface facing the feeding turntable 11. The curvature of the arc-shaped flow-limiting surface is adapted to the rotation trajectory of the radial outer end of the material separator 112. Preferably, the flow-limiting plate 125 and the scrap steel inlet 101 are located on opposite sides of the aforementioned reference surface. By setting the flow-limiting plate 125, it can be fitted with the material separator 112 that has rotated to this location to restrict the passage of flue gas. On the one hand, this can promote heat exchange between the flue gas and the scrap steel 6 in the hopper. On the other hand, it can maintain a certain flue gas pressure around the scrap steel inlet 101, which not only ensures the positive pressure sealing effect at the scrap steel inlet 101, but also improves the preheating effect of the scrap steel in this area.

[0053] The aforementioned sealing fume hood 12, material separator 112, central rotating shaft 111, etc. are preferably designed to be water-cooled in order to extend the service life of the equipment.

[0054] Example 2: Figure 1 This invention provides a scrap steel feeding and preheating system, including a feeder, a feeding trolley 2 for connecting to the furnace body feeding port, and a horizontal feeding trough 3 connected to the feeding trolley 2. A protective fume hood 31 is connected to the horizontal feeding trough 3.

[0055] Preferably, the above-mentioned feeding trolley 2 is equipped with a trolley vibrator, and the entire feeding trolley 2 can vibrate and feed under the action of the trolley vibrator, so as to send the scrap steel material from the horizontal feeding chute 3 into the furnace body.

[0056] The tail end of the material trough of the feeding trolley 2 and the front end of the horizontal feeding trough 3 are preferably arranged in a non-contact overlapping manner (the cross length is determined according to the width of the material trough and the amount of material transported) to ensure that the scrap steel 6 can be smoothly transported from the horizontal feeding trough 3 to the feeding trolley 2.

[0057] like Figure 1 The aforementioned horizontal feeding trough 3 is equipped with a tail vibrator 32.

[0058] Preferably, such as Figure 1 The system also includes the scrap steel feeding device 1 provided in Embodiment 1 above. The protective fume hood 31 is provided with a feeding port. The bottom of the open end of the sealed fume hood 12 is connected to the feeding port. The material outlet of the feeder is connected to the scrap steel inlet 101.

[0059] The aforementioned feeder can be a chain conveyor or a slat conveyor, which transports scrap steel from the platform or ground to the scrap steel inlet 101, and then unloads it into the feed turntable 11.

[0060] Among them, such as Figure 1 The feeding turntable 11 extends partially into the protective fume hood 31, which can reduce the impact of scrap steel falling on the horizontal feeding chute 3.

[0061] The electric furnace flue gas passes through the feeding trolley 2 and the horizontal feeding chute 3 in sequence, and then enters the scrap steel feeding device 1, thus enabling multi-stage preheating of the scrap steel 6; the electric furnace flue gas is finally discharged from the flue gas outlet 102 for subsequent processing.

[0062] Example 3: This embodiment of the invention provides a scrap steel preheating device, which can be used in Example 2 above, specifically arranged between the feeding trolley 2 and the horizontal feeding trough 3.

[0063] like Figure 4 and Figure 5 The scrap steel preheating device includes a rotary drum 511 and a rotary drive mechanism for driving the rotary drum 511 to rotate. A plurality of inner material grooves 518 are formed on the inner wall of the rotary drum 511. Each inner material groove 518 extends from one end of the rotary drum 511 to the other end, and the inner material grooves 518 are arranged sequentially along the circumference of the rotary drum 511.

[0064] Preferably, the outer wall of the rotary cylinder 511 is cylindrical to facilitate rotary motion. For the rotary drive, a transmission unit is preferably provided on the outer wall of the rotary cylinder 511, which is connected to the rotary drive mechanism; this includes, but is not limited to, a pin-gear transmission method. The transmission unit correspondingly uses pins 514, which are evenly arranged around the circumference of the rotary cylinder 511. The rotary drive mechanism correspondingly includes a pin gear 513 and a rotary drive unit 512. The pin gear 513 meshes with the pins 514. The rotary drive unit 512 includes, but is not limited to, a motor, and its output end is connected to the pin gear 513. Obviously, gear drives, chain drives, belt drives, etc., can all be used as alternatives to the pin-gear transmission method, and will not be listed here.

[0065] Optionally, such as Figure 4 A rotary guide mechanism can be provided on one or both sides of the rotary drive point (the position corresponding to the transmission part / rotary drive mechanism) to guide the rotary motion of the rotary cylinder 511 and ensure the stability and reliability of the rotary motion. In one embodiment, the rotary guide mechanism includes multiple support wheels 517, which are arranged sequentially at intervals along the circumference of the rotary cylinder. Each support wheel 517 rolls in contact with the outer wall of the rotary cylinder (the axial direction of the support wheel 517 is parallel to the axial direction of the rotary cylinder). In this scheme, the support wheels 517 not only guide the rotary cylinder 511 in rotation, but also reliably support and limit the rotation of the rotary cylinder 511. Preferably, rotary guide mechanisms are provided on both sides of the rotary drive point, which can ensure the stability of the position of the rotary cylinder 511 and improve the stability of the rotary motion.

[0066] Preferably, the rotary drum 511 is further equipped with an axial limiting mechanism to restrict its axial displacement, limiting the rotary drum 511 to only rotate, thus ensuring the stability and reliability of the rotary drum 511's movement. In one embodiment, such as Figure 4 The axial limiting mechanism includes an annular limiting plate 515 and at least one set of limiting wheels. The annular limiting plate 515 is coaxially disposed on the outer wall of the rotary cylinder 511. Each set of limiting wheels includes two limiting wheels 516 arranged on both sides of the annular limiting plate 515 along the axial direction of the rotary cylinder 511. The two limiting wheels 516 respectively roll in contact with the annular limiting plate 515 (the axis of the limiting wheel 516 is perpendicular to the axis of the rotary cylinder 511). This axial limiting method can ensure the axial limiting effect without affecting the rotational movement of the rotary cylinder 511.

[0067] Preferably, the axis of the rotary feed cylinder 511 is parallel to the horizontal plane; in addition, both ends of the rotary feed cylinder 511 are open to facilitate the entry and exit of scrap steel 6 and the entry and exit of electric furnace flue gas.

[0068] The inner material trough 518 is arranged along the length direction (i.e., the axial direction) of the rotating material cylinder 511. The length direction of the inner material trough 518 is preferably parallel to the axial direction of the rotating material cylinder 511, but it is also feasible to have an angle greater than 0° and less than 90° between the length direction of the inner material trough 518 and the axial direction of the rotating material cylinder 511.

[0069] Having only two inner material troughs 518 within the rotary drum 511 is a feasible solution, but it is preferable to design three or more inner material troughs 518, as this is more beneficial for the preheating of scrap steel 6. Figure 5 The diagram shows a configuration in which three inner material troughs 518 are formed inside the rotary drum 511; configurations with more than three inner material troughs 518 are also feasible, but are not shown.

[0070] like Figure 7 During the rotation of the rotary drum 511, scrap steel 6 can flow from one inner trough 518 to an adjacent inner trough 518. By causing the scrap steel 6 to flow between different inner troughs 518, the scrap steel 6 can be flipped over, so that the upper and lower layers of the scrap steel layer can have sufficient heat exchange with the flue gas. At the same time, the rolling and flipping action of the scrap steel 6 can make the material layer looser, greatly improving the heat exchange efficiency of the scrap steel layer, and finally the preheating temperature of the scrap steel is greatly improved.

[0071] Each inner material trough 518 has two opposing trough walls. In one embodiment, the width defined between the two trough walls is consistent from the bottom to the opening; in another embodiment, the width defined between the two trough walls gradually increases from the bottom to the opening. Alternatively, a stepped trough design is also feasible for the inner material trough 518, in which each segment of the inner material trough 518 can adopt either of the aforementioned width forms. If the width defined between the two trough walls gradually decreases from the bottom to the opening, it may increase the difficulty for the scrap steel 6 to escape from the inner material trough 518; therefore, it is preferable not to adopt this structure.

[0072] In one embodiment, the planes containing the inner material trough walls 5181 of each group of adjacent inner material troughs 518 intersect, specifically:

[0073] The two inner material trough walls 5181 of each group of adjacent inner material troughs 518 directly intersect each other.

[0074] Alternatively, the two inner material trough walls 5181 of each group of adjacent inner material troughs 518 extend and intersect. In this case, it is preferable that the two inner material trough walls 5181 extend from the bottom of the trough to the outside of the trough opening until they intersect, that is, the intersection is located on the side of the trough opening away from the bottom of the trough.

[0075] Optionally, the dihedral angle between the planes of the inner material trough walls 5181 of each group of adjacent inner material troughs 518 is within the range of 80° to 150°, which facilitates the transfer and flow of scrap steel 6 between the two adjacent inner material troughs 518.

[0076] Preferably, such as Figure 5 The scheme of "the two inner material trough walls 5181 of each group of adjacent inner material troughs 518 directly intersects" is more conducive to the transfer and flow of scrap steel 6 between two adjacent inner material troughs 518.

[0077] like Figure 7In use, as the rotary drum 511 rotates, the scrap steel 6 rotates together with the inner material trough 518. Since the inner material trough 518 has a certain height, the scrap steel 6 will not immediately tumble when it starts to rotate. After rotating to a certain angle, the scrap steel 6 will begin to fall into the adjacent inner material trough 518 in the opposite direction of the rotary drum 511 under the action of gravity. Since there are trough walls between the inner material troughs 518, the scrap steel 6 will slide down along the intersecting inner material trough walls 5181 into another inner material trough 518. Since the upper layer of scrap steel 6 has no accumulation effect, the upper layer of scrap steel 6 will flip first. As the angle of the rotary drum 511 increases, the scrap steel 6 will slowly fall from the upper layer to the lower layer. The intersecting inner material trough walls 5181 also play an auxiliary role in making the scrap steel layer flip up and down. After the rotary drum 511 rotates to a certain angle, the upper and lower layers of scrap steel are completely switched. The lower layer of scrap steel 6 with a lower temperature will be baked and heat exchanged with the flue gas.

[0078] Further optimize the above-mentioned scrap steel preheating device, such as Figure 4 One end of the rotary feed cylinder 511 is connected to a feeding section and is rotatable relative to the feeding section. Accordingly, the feeding section includes the horizontal feeding trough 3 and the protective fume hood 31 in the above embodiment.

[0079] The rotary feed cylinder 511 can rotate relative to the horizontal feeding trough 3 and the protective fume hood 31. Therefore, there is no fixed connection between the rotary feed cylinder 511 and the horizontal feeding trough 3, or between the rotary feed cylinder 511 and the protective fume hood 31. This allows for a clearance fit between the feed end of the rotary feed cylinder 511 and the discharge end of the horizontal feeding trough 3, and between the feed end of the rotary feed cylinder 511 and the smoke inlet end of the protective fume hood 31. This ensures that the rotary feed cylinder 511 can rotate freely, while reducing the escape of flue gas and dust from between the rotary feed cylinder 511 and the horizontal feeding trough 3, and between the rotary feed cylinder 511 and the protective fume hood 31. Optionally, such as... Figure 4 The discharge end of the horizontal feeding trough 3 protrudes downward to form a lower flange, which is clearance-fitted with the inner wall of the rotary drum 511. This method facilitates the transfer of scrap steel 6 from the horizontal feeding trough 3 to the rotary drum 511; the outer wall of the protective fume hood 31 is clearance-fitted with the inner wall of the rotary drum 511.

[0080] Furthermore, such as Figure 4 The joints between the rotary feed cylinder 511 and the horizontal feed trough 3, and between the rotary feed cylinder 511 and the protective fume hood 31, are sealed. This includes, but is not limited to, using an annular seal 54 to seal both joints simultaneously. The annular seal 54 can be installed at the feed end of the rotary feed cylinder 511 and rotate with the rotary feed cylinder 511, or it can be installed on the horizontal feed trough 3 and the protective fume hood 31. Both methods can achieve dynamic sealing through the annular seal 54.

[0081] Further optimize the above-mentioned scrap steel preheating device, such asFigure 4 The other end of the rotary material cylinder 511 is connected to a discharge section and is rotatable relative to the discharge section. The discharge section includes a discharge trough 531 and a discharge fume hood 532 covering the discharge trough 531. Preferably, the discharge trough 531 and the discharge fume hood 532 are detachably fixed together, and a sealing element can be provided at the connection between the two to improve the sealing performance. The rotary drum 511 can rotate relative to the discharge chute 531 and the discharge hood 532. Therefore, there is no fixed connection between the rotary drum 511 and the discharge chute 531, or between the rotary drum 511 and the discharge hood 532. This allows for a clearance fit between the discharge end of the rotary drum 511 and the feed end of the discharge chute 531, and between the discharge end of the rotary drum 511 and the smoke outlet end of the protective hood 31. This ensures that the rotary drum 511 can rotate freely, while reducing the escape of flue gas and dust from between the rotary drum 511 and the discharge chute 531, and between the rotary drum 511 and the discharge hood 532, as well as the entry of outside air. Optionally, such as Figure 4 The feed end of the discharge chute 531 protrudes upward to form an upper flange, which is clearance-fitted with the outer wall of the rotary drum 511. This method facilitates the transfer of scrap steel 6 from the rotary drum 511 to the discharge chute 531; the inner wall of the discharge hood 532 is clearance-fitted with the outer wall of the rotary drum 511.

[0082] Furthermore, such as Figure 4 The joint between the rotary material cylinder 511 and the discharge hood 532 is sealed, including but not limited to sealing the joint with a sealing plate 55. The sealing plate 55 is preferably installed on the inner wall of the discharge hood 532 and abuts against the discharge end of the rotary material cylinder 511. It maintains contact with the rotary material cylinder 511 during rotation to achieve dynamic sealing. When the sealing plate 55 is made of an elastic sealing material with a certain degree of elasticity, its dynamic contact effect with the rotary material cylinder 511 is better.

[0083] A seal can also be provided at the joint between the rotary drum 511 and the discharge chute 531. This seal is preferably located on the outer surface of the upper flange and contacts the outer wall of the rotary drum 511, thus avoiding interference with the scrap steel 6 inside the discharge chute 531. In another optional embodiment, such as... Figure 4 The sealing at this location can be achieved using the support wheel 517 on the corresponding side. This structure also facilitates the installation of the support wheel 517, for example, by mounting one end of the axle of the support wheel 517 onto the upper flange. Similarly, the support wheel 517 can also be used to seal the joint between the rotating material cylinder 511 and the discharge hood 532 from the outside.

[0084] In one embodiment, such as Figure 4The scrap steel preheating device also includes a synchronization frame 56. The lower part of the synchronization frame 56 is fixedly connected to the horizontal feeding chute 3 and the discharge chute 531, respectively, and the upper part of the synchronization frame 56 is fixedly connected to the protective fume hood 31 and the discharge fume hood 532, respectively. Based on this structure, the horizontal feeding chute 3 and the discharge chute 531 are connected into an integral structure by the synchronization frame 56, and the rotary material cylinder 511 is rotatably mounted on this integral structure. This allows the horizontal feeding chute 3, the rotary material cylinder 511, and the discharge chute 531 to resonate at the same frequency as the vibrator, so that the scrap steel 6 is continuously conveyed forward into the electric furnace 3.

[0085] Among them, the aforementioned rotary drive unit 512, limit wheel 516, support wheel 517 and other components can be installed on the synchronous frame 56. Therefore, the installation of the synchronous frame 56 can greatly facilitate the installation of related supporting facilities of the rotary drum 511, and correspondingly simplify the structure of the scrap steel preheating device.

[0086] More preferably, the synchronizing frame 56 adopts an annular cylindrical frame body, which surrounds the rotating material cylinder 511. This not only facilitates the connection between the synchronizing frame 56 and the horizontal feeding trough 3, the discharge trough 531, the protective fume hood 31, and the discharge fume hood 532, but also makes it easier to ensure the sealing performance of the connection between the synchronizing frame 56 and the horizontal feeding trough 3, the discharge trough 531, the protective fume hood 31, and the discharge fume hood 532. This greatly improves the sealing performance of the scrap steel preheating device and can avoid situations such as poor dynamic sealing leading to the escape of flue gas and dust and the entry of outside air.

[0087] Preferably, such as Figure 6 The bottom of the horizontal feeding trough 3, the bottom of the cylinder cavity of the rotary material cylinder 511, and the bottom of the discharge trough 531 are arranged at different heights to facilitate the flow of scrap steel 6 and to facilitate the turning and loosening of scrap steel 6. Optionally, the height difference between the bottom of the horizontal feeding trough 3 and the bottom of the cylinder cavity of the rotary material cylinder 511 is in the range of 600~700mm, and the height difference between the bottom of the cylinder cavity of the rotary material cylinder 511 and the bottom of the discharge trough 531 is in the range of 600~700mm.

[0088] Additionally, preferably, such as Figure 5 and Figure 6 The width of the horizontal feeding trough 3 is smaller than the width of the inner material trough 518. Optionally, a connecting cross section is provided at the discharge end of the horizontal feeding trough 3. The width of this connecting cross section gradually increases from the horizontal feeding trough 3 towards the rotary cylinder 511, so as to facilitate a better connection between the horizontal feeding trough 3 and the inner material trough 518. Similarly, the width of the discharge trough 531 is larger than the width of the inner material trough 518. Optionally, a connecting cross section is provided at the feed end of the discharge trough 531. The width of this connecting cross section gradually increases from the rotary cylinder 511 towards the discharge trough 531, so as to facilitate a better connection between the discharge trough 531 and the inner material trough 518.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A scrap steel feeding device, characterized in that, Including the feeding turntable and the sealing fume hood, The feeding turntable includes a central rotating shaft and multiple material separating spokes. Each material separating spoke is connected to the central rotating shaft and extends outward in a radial pattern. Each pair of adjacent material separating spokes encloses a material bin. The axis of rotation of the central rotating shaft is parallel to the horizontal plane and is connected to a turntable drive unit for driving its rotation. The sealed fume hood covers and protects the feeding turntable. The bottom of the sealed fume hood is open, and the top of the sealed fume hood has a scrap steel inlet and a flue gas outlet.

2. The scrap steel feeding device as described in claim 1, characterized in that: The sealed fume hood includes a top plate, two parallel and opposite first fume hood side plates, and two parallel and opposite second fume hood side plates. The surface of the first fume hood side plates is perpendicular to the axis of the central rotating shaft. The two transverse ends of the partition plate are respectively fitted with the two first fume hood side plates with clearance.

3. The scrap steel feeding device as described in claim 1, characterized in that: A flue gas passage is provided on the material separator.

4. The scrap steel feeding device as described in claim 1, characterized in that: A limiting plate is provided at the bottom of the sealed fume hood. The limiting plate is located at the turntable unloading point and extends towards the inner side of the hood cavity to the radial outer end near the material separator plate along its rotational trajectory.

5. The scrap steel feeding device as described in claim 1 or 4, characterized in that: Each material separator is provided with a scraper at its radial outer end. The scraper extends forward from the surface of the material separator along the rotation direction of the turntable.

6. The scrap steel feeding device as described in claim 1, characterized in that: With the vertical symmetry plane of the feeding turntable as the reference plane, the scrap steel inlet and the turntable unloading point are located on both sides of the reference plane, and the flue gas outlet and the scrap steel inlet are located on both sides of the reference plane.

7. The scrap steel feeding device as described in claim 1, characterized in that: The inner wall of the sealed fume hood is provided with a flow limiting plate. The flow limiting plate has an arc-shaped flow limiting surface facing the feeding turntable. The curvature of the arc-shaped flow limiting surface is adapted to the rotation trajectory of the radial outer end of the material separating plate.

8. The scrap steel feeding device as described in claim 1, characterized in that: A dynamic sealing plate is installed at the scrap steel inlet.

9. A scrap steel feeding and preheating system, comprising a feeder, a feeding trolley for connecting to the furnace body feeding port, and a horizontal feeding chute connected to the feeding trolley, wherein a protective fume hood is connected to the horizontal feeding chute, characterized in that: It also includes the scrap steel feeding device as described in any one of claims 1 to 8, wherein the protective fume hood has a feed inlet, the bottom of the open end of the sealed fume hood is connected to the feed inlet, and the material outlet of the feeder is connected to the scrap steel inlet.

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