CN119193971A

CN119193971A - EAF furnace continuous or intermittent scrap steel charging device and EAF furnace charging method

Info

Publication number: CN119193971A
Application number: CN202411182188.6A
Authority: CN
Inventors: 查勇; 李东; 查炜玮; 赵孝峰; 赵维超
Original assignee: Huatian Engineering and Technology Corp MCC
Current assignee: Huatian Engineering and Technology Corp MCC
Priority date: 2024-08-27
Filing date: 2024-08-27
Publication date: 2024-12-27

Abstract

The invention discloses a continuous or intermittent scrap steel feeding device and a continuous scrap steel feeding method of an EAF furnace. The device comprises a horizontal feeding section and a slope feeding tank, wherein the lower end of the slope feeding tank is connected to a furnace body inlet, the upper end of the slope feeding tank is communicated with the horizontal feeding section, an air suction opening is formed in the upper end of the slope feeding tank, a smoke recycling device is arranged at the air suction opening, a steel fence is rotatably arranged on the top plate of the slope feeding tank and close to the lower end of the slope feeding tank, the steel fence is used for intercepting or releasing materials sliding downwards in the slope feeding tank through rotation, and when the steel fence is used for intercepting materials sliding downwards in the slope feeding tank, high-temperature smoke in the furnace passes through a parting bead gap under the action of the smoke recycling device and moves towards the air suction opening along the slope feeding tank, and heat exchange with the materials is completed in the moving process. The invention can realize continuous or intermittent scrap steel adding of the EAF furnace, and preheat the scrap steel by adopting high-temperature flue gas in the furnace, thereby reducing the energy loss of the electric arc of the EAF furnace.

Description

Continuous or intermittent scrap steel feeding device and method for EAF furnace

Technical Field

The invention relates to the technical field of EAF furnace smelting, in particular to a continuous or intermittent scrap steel feeding device and a continuous scrap steel feeding method of an EAF furnace.

Background

The EAF furnace is an important smelting device in metallurgical industry, is widely applied to iron and steel smelting or nonferrous metal smelting and the like, and melts waste metal raw materials through high temperature generated by electric arc for smelting and refining to produce various products such as steel, alloy and the like. The EAF furnace is mainly characterized in that a large amount of scrap steel and scrap iron can be used as raw materials, and compared with the traditional smelting method, the EAF furnace reduces the dependence on natural ore resources such as iron ore and the like, reduces the production cost and reduces the environmental pollution.

There are three common feeding modes of EAF scrap feeding systems, namely vertical feeding, horizontal feeding and basket feeding. The vertical feeding is carried through big inclination, carries the scrap steel to EAF stove top, holds in the palm with the golden finger, then discharges after utilizing high temperature flue gas to preheat, and the advantage is that scrap steel preheats the temperature height, saves the energy, but its maintenance cost is too high, and the project of putting into production uses fewly. The horizontal feeding is realized by adopting a vibration exciter to drive the whole conveyor to horizontally and continuously feed, such as an Consco electric furnace feeding system, the application is wide, continuous feeding can be realized, but the waste steel preheating input cost is high, and meanwhile, under the action of the vibration exciter, the whole equipment vibrates and operates, so that more maintenance is realized. The material basket is adopted for feeding the material at the top of the EAF directly, the material basket is used for feeding the material manually under special conditions, a driver pours the scrap steel into the material basket in advance, then the material basket is lifted to the top of the EAF furnace, the EAF furnace cover is opened, the material basket is used for discharging, and the operation is complicated.

Disclosure of Invention

According to one embodiment of the invention, the invention aims to provide a novel continuous or intermittent scrap steel feeding device of an EAF furnace and an EAF furnace feeding method. The device can not only continuously or intermittently feed (namely, scrap steel) to the EAF furnace, but also preheat the scrap steel by adopting high-temperature flue gas in the furnace, thereby reducing the energy loss of the electric arc of the EAF furnace.

The above object can be achieved by the following embodiments of the present invention:

The invention provides a continuous or intermittent scrap steel feeding device of an EAF furnace, which comprises a horizontal feeding section and a slope feeding groove, wherein the lower end of the slope feeding groove is connected to a furnace body inlet, and the upper end of the slope feeding groove is communicated with the horizontal feeding section;

The steel fence comprises a rotating shaft and a plurality of parting strips which are arranged on the rotating shaft at intervals, the steel fence is rotatably arranged on the top plate of the slope feeding groove through the rotating shaft, the rotating shaft is arranged along the width direction of the slope feeding groove, a plurality of strip holes matched with the parting strips are formed in the top plate of the slope feeding groove along the length direction, the strip holes are always sealed by the parting strips in the rotating range of the steel fence, materials sliding down in the slope feeding groove are trapped or released through rotation of the steel fence, when the materials sliding down in the slope feeding groove are trapped by the steel fence, high-temperature flue gas in the furnace passes through the parting strips under the action of the flue gas recovery device, moves towards the air suction inlet along the slope feeding groove, and exchanges heat with the materials in the moving process.

Optionally, the parting strips in the steel fence are of a fan-shaped structure with equal thickness.

Optionally, the parting bead in the steel fence is of a fan-shaped cavity structure, and cooling water is filled in the parting bead.

Optionally, the thickness of each fan-shaped cavity structure is the same, and the gaps among the division bars are consistent.

Optionally, a cooling water channel is arranged inside the rotating shaft, and the inside of the fan-shaped cavity structure is communicated with the cooling water channel.

Optionally, a finger is arranged at the tail end of the parting bead, the width of the finger is consistent with the width of the parting bead along the direction of the rotating shaft, and the finger tip of the finger faces the feeding direction.

Optionally, the size of the elongated hole on the top plate of the slope feeding groove is slightly larger than the size of the parting bead, and the parting bead is arranged in the elongated hole in the middle, so that the steel fence can rotate conveniently.

Optionally, a gap is formed between the strip hole and the parting bead, and a sealing strip is arranged along the inner side of the strip hole and is used for sealing the gap formed between the strip hole and the parting bead under the condition that the rotation of the steel fence is not affected.

Optionally, the sealing strip is high temperature resistant asbestos.

The two ends of the rotating shaft extend out of the top of the slope feeding tank respectively and are connected with the end parts of telescopic rods of the hydraulic cylinders respectively through coaxial connecting rods, and the rotating shaft realizes rotation through the telescopic rods of the hydraulic cylinders and drives the plurality of parting strips to synchronously rotate.

Optionally, the slope charging hopper is closed structure, wholly has the water-cooling wall, and bottom and both sides are wear-resisting heat-resisting material.

Optionally, a horizontal conveying belt is arranged at the bottom of the horizontal feeding section, and a power driving device of the horizontal conveying belt is arranged outside the horizontal feeding section.

Optionally, the horizontal feeding section comprises a U-shaped open initial section and a closed conveying section, wherein a sealing feeding door is further arranged at the inlet of the conveying section, and the bottom of the sealing feeding door is tightly attached to the material and is used for effectively blocking cold air of the initial section.

The invention provides an EAF furnace charging method, which adopts the continuous or intermittent scrap steel charging device of the EAF furnace for charging, and comprises the following steps:

Turning the steel fence to intercept the material sliding downwards in the slope feeding tank to accumulate the material in the slope feeding tank from bottom to top, starting the fume recovering device to make the high temperature fume enter the slope feeding tank and exchange heat with the material in the slope feeding tank, and exhausting the fume through the air suction port after heat exchange;

and rotating the steel fence to release the materials sliding downwards in the slope charging groove so as to enable the materials to freely slide into the furnace.

According to one embodiment of the invention, through the slope charging tank and the steel fence rotatably arranged on the slope charging tank, continuous or intermittent steel scrap charging for the EAF furnace is realized, and high-temperature flue gas in the furnace can be adopted to preheat the steel scrap, so that the energy loss of an electric arc of the EAF furnace is reduced. In addition, due to the slope design of the slope charging groove, the scrap steel conveyed by the horizontal charging section can freely slide into the furnace body through the inclined channel of the slope charging groove, so that the impact of charging on an EAF furnace molten pool is effectively reduced. The invention has the advantages of low cost, simple operation, convenient maintenance and long service life.

Drawings

FIG. 1 is a front view of an EAF furnace continuous or intermittent scrap loading assembly in accordance with an embodiment of the invention with the steel fence closed (i.e., while retaining material sliding down the ramp loading chute);

FIG. 2 is a front view of an EAF furnace continuous or intermittent scrap loading assembly with a steel fence open (i.e., discharging material sliding down a ramp loading chute) in accordance with one embodiment of the present invention;

FIG. 3 is a top view of a continuous or intermittent scrap loading assembly for an EAF furnace in accordance with one embodiment of the invention, showing the mounting structure between the steel fence and the ramp loading chute;

FIG. 4 is an enlarged schematic view of the steel fence of FIG. 1;

FIG. 5 is an enlarged schematic view of the steel fence of FIG. 3;

FIG. 6 schematically illustrates a schematic view of the configuration of the elongated aperture in the continuous or intermittent scrap loading assembly of the EAF furnace in one embodiment, and also illustrates a schematic view of the assembly between the first elongated aperture and a parting bead;

FIG. 7 schematically illustrates a schematic of a high temperature asbestos packing at a portion of the gap between the ramp feed tank and the steel fence in one embodiment;

FIG. 8 schematically illustrates a schematic diagram of the division bar of the continuous or intermittent scrap charging apparatus of the EAF furnace in one embodiment.

The device comprises an EAF furnace 1, a steel fence 2, a power hydraulic cylinder 3, a slope feeding groove 4, an air suction inlet 5, a horizontal feeding section 6, a horizontal conveying mechanism 7 and high temperature resistant asbestos 8.

Detailed Description

The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The continuous or intermittent waste steel feeding device for the EAF furnace provided by the invention has the advantages that the slope feeding groove is arranged at the tail end of the horizontal feeding section, the impact of feeding on a molten pool of the EAF furnace is effectively reduced by adopting a mode of conveying waste steel horizontally at the initial end and freely sliding down in the slope feeding groove at the tail end, the steel fence is rotationally arranged in the slope feeding groove, and the steel fence is rotated to enable the slope feeding groove to open a blanking channel or semi-close the blanking channel, so that materials are trapped or discharged, and the continuous or intermittent feeding of the EAF furnace is realized.

The semi-closed steel fence is characterized in that the gaps of the steel fence parting strips prevent materials from passing through and simultaneously enable high-temperature smoke in the furnace to pass through, so that the semi-closed steel fence is called semi-closed. The high-temperature flue gas passes through the parting bead gap and enters the slope charging tank, and moves towards the air outlet along the material gap, the material can be preheated in the moving process, and the preheated material enters the furnace again, so that the influence on the temperature of a molten pool in the furnace when cold material enters the furnace is reduced, the energy loss of an electric arc of an EAF furnace is reduced, and the requirements of energy conservation and environmental protection during charging are met.

Fig. 1 and 2 schematically illustrate the structure of a continuous or intermittent scrap feeding apparatus for an EAF furnace in accordance with an embodiment of the present invention in a closed state and an open state of a steel fence, respectively. Fig. 3 schematically illustrates the mounting structure between the steel fence and the ramp feed tank. Fig. 4 and 5 are enlarged structures of the steel fence installation place of fig. 1 and 3, respectively.

Referring to fig. 1 to 5, the continuous or intermittent scrap steel feeding device of the EAF furnace mainly comprises an EAF furnace 1, a steel fence 2, a power hydraulic cylinder 3, a slope feeding groove 4, an air suction inlet 5, a horizontal feeding section 6 and a horizontal conveying mechanism 7, wherein the slope feeding groove 4 is an inclined groove body, the lower end of the slope feeding groove is connected with a furnace body inlet, the upper end of the slope feeding groove is connected with the horizontal feeding section 6, and the steel fence 2 is rotatably arranged at the outer side of the top of the slope feeding groove 4 and close to the lower end of the slope feeding groove and is used for intercepting or releasing materials sliding downwards in the slope feeding groove 4. The steel fence comprises a rotating shaft and a plurality of parting strips arranged on the rotating shaft at intervals, the steel fence is rotatably arranged on a top plate of the slope feeding groove through the rotating shaft, the rotating shaft is arranged along the width direction of the slope feeding groove, a plurality of strip holes (shown by reference to fig. 6) matched with the parting strips are formed in the top plate of the slope feeding groove along the length direction, and the strip holes are always sealed by the parting strips in the rotating range of the steel fence. Due to the existence of the gap between the steel bars 2 and the separation bars, when the steel bars intercept materials sliding down in the slope feeding groove, the steel bars belong to the state of the semi-closed slope feeding groove, so that high-temperature flue gas in the furnace can pass through the gap between the separation bars under the action of the flue gas recovery device while intercepting the materials, and can move along the suction inlet in the slope feeding groove, and heat exchange with the materials can be completed in the moving process.

The suction inlet 5 is arranged at the high end of the slope feeding tank 4, as shown in fig. 1, can be arranged at the joint of the horizontal feeding section 6 and the slope feeding tank 4, and is provided with a flue gas recovery device, such as a dust removal fan, etc., so as to generate negative pressure in the slope feeding tank 4, so that high-temperature flue gas in the furnace can effectively flow to the suction inlet along the slope feeding tank and a material gap, and the high-efficiency heat exchange with scrap steel is completed in the flowing process, the flue gas is discharged after the heat exchange, and the scrap steel enters the furnace after being preheated by the high-temperature flue gas. The size of gaps among the plurality of parting strips of the steel fence is smaller than the size of the material, so that the material does not pass through and high-temperature smoke can pass through. The fence structure made of steel can effectively intercept the waste steel, meanwhile, the passing of high-temperature smoke is not influenced, the waste steel is not preheated by flowing of the high-temperature smoke, and as the waste steel is preheated by the high-temperature smoke, the influence on the reduction of the temperature of a molten pool is reduced after the waste steel enters the EAF furnace molten pool, and the power consumption of electric arc heating to melt the waste steel is also reduced. The slope feeding tank 4 is a channel for fully utilizing high-temperature flue gas and is also a discharging channel for adding scrap steel, if smelting requires scrap steel without preheating, the steel fence 2 can be kept in an open state, the scrap steel directly slides down along the slope feeding tank 4 under the action of self gravity, and the blanking speed is low due to the existence of slope, so that the impact on an EAF furnace molten pool is reduced.

In some embodiments, the steel barrier is driven by an external drive means to effect a rotational mounting on the ramp feed tank. As shown in fig. 1 to 3, hydraulic cylinders 3 are fixedly installed at both sides of the outside of the slope feeding tank 4, respectively, and the two hydraulic cylinders 3 are power hydraulic cylinders 3 and operate synchronously to drive the rotation shaft of the steel fence to rotate. The rotation axis rotates and installs at the top of slope loading tank 4, for example can fix on slope loading tank roof surface through the mount pad, and the rotation axis both ends stretch out slope loading tank 4 roof outside and link to each other with the telescopic link tip of pneumatic cylinder 3 through coaxial connecting rod respectively.

According to the embodiment, the steel fence 2 is driven to rotate through the external hydraulic cylinder 3, when the telescopic rod of the hydraulic cylinder 3 stretches, the rotary shaft rotates based on the action of the coaxial connecting rod, and the rotary shaft drives the plurality of parting strips fixed on the rotary shaft to rotate (namely, the opening and closing angles of the steel fence 2 are adjusted), so that the operation of the semi-closed slope feeding tank 4 or the operation of opening the feeding channel can be completed, materials in the slope feeding tank 4 can be trapped or released, the high-temperature flue gas in the furnace can smoothly pass through the parting strip gaps while the materials are trapped by the fence structure, so that the flue gas enters the slope feeding tank 4 and exchanges heat with the materials in the slope feeding tank 4, and the device can be used for continuously feeding and intermittently preheating feeding. In addition, because the hydraulic cylinder 3 for driving the steel fence 2 to rotate is fixedly arranged outside the slope feeding tank 4, the heat radiation is reduced, the later maintenance is convenient, and the operation is more convenient when the continuous feeding or intermittent preheating feeding function can be realized according to the smelting process requirements.

In the application, the slope feeding groove 4 is of a closed structure and comprises a top plate, a bottom plate and two side plates. As described above, although the long holes are opened in the top plate thereof in order to pass the steel fence parting strip, all the long holes are always closed by the parting strip in the rotation range of the steel fence, and thus, the slope feeding tank is kept closed. In addition, the slope charging tank 4 is integrally provided with a water cooling wall so as to prevent heat radiation of high-temperature flue gas from influencing the service life of the device. The bottom and the two sides of the slope feeding groove 4 are made of wear-resistant and heat-resistant materials.

In a preferred embodiment, the elongated holes in the top plate of the ramp feed tank are sized slightly larger than the size of the bars in order to ensure smooth rotation of the steel barrier bars in the elongated holes. For example, the elongated hole may be 2-6mm larger than the spacer bar, e.g., a steel fence spacer bar width of 100mm, and then the elongated hole width may be set to 104mm.

Further, in order to ensure the sealing effect, the assembly gap between the long strip hole of the slope feeding groove and the steel fence parting strip is provided with a high-temperature-resistant sealing strip, so that dust, smoke and the like can be prevented from leaking. For example, when the width of the steel fence parting strip is 100mm, and the width of the strip hole is 104mm, in the case of uniform arrangement in the middle, a single-side gap between the parting strip and the strip hole is 2mm, and high-temperature-resistant asbestos is filled in the gap, so that sealing is realized under the condition that the rotation of the steel fence parting strip in the strip hole is not influenced. The assembly structure between the strip hole and the parting bead in an embodiment is schematically shown at the leftmost side in fig. 6, and in this embodiment, the gaps between the strip hole and the parting bead are sealed by adopting high temperature resistant asbestos 8, including two sides and a bottom side, and the gaps are filled with the high temperature resistant asbestos, so that the flue gas is prevented from escaping from the gaps, and the problem that the flue gas escapes from the gaps to cause high temperature toxic flue gas and dust to overflow to a workshop to cause workshop pollution and personnel safety and health is avoided. Fig. 7 shows a schematic view of the gap between the slope feeding tank and the steel fence being filled with high temperature asbestos, as shown in fig. 7, the gap formed between the slope feeding tank and the steel fence being filled with high temperature asbestos 8, thereby preventing flue gas from overflowing from the junction.

In some preferred embodiments, the parting strips in the steel fence are fan-shaped structures with a certain thickness. As shown in fig. 1, 2 and 8, the sides of the parting bead are all fan-shaped, and as shown in fig. 3, the parting bead has a certain thickness. Through adopting fan-shaped structure with the parting bead in the steel fence, the bottom has the arc, can be more convenient for the parting bead rotate smoothly in rectangular hole, also can ensure in the rotation scope of steel fence, rectangular hole can be sealed by the parting bead all the time, and then ensures the closure of slope charging hopper. In addition, the steel fence is arranged into a fan-shaped structure with a steel structure, has a large volume, improves the strength of the steel fence to a certain extent, and can more effectively intercept scrap steel under the driving of a hydraulic cylinder.

Further, each division bar has the same structure, the fan-shaped structure has the same thickness design, namely the division bars have the same width along the direction of the rotating shaft, and the gaps among the division bars are set to the same size. The partition strips with the fan-shaped structures are designed to have equal thickness, namely the side surfaces of the partition strips are all on the same horizontal plane, the top plate of the slope feeding groove has a certain thickness, after the strip holes are formed, the side walls of the strip holes are also on the same horizontal plane, and the partition strips are uniformly and centrally arranged in the strip holes. On one hand, the gaps are consistent, so that high-temperature resistant asbestos is convenient to set, on the other hand, the gaps between the side surfaces of the parting strips and the side walls of the strip holes are constant within the rotating angle range of the parting strips, and cannot change due to rotation, so that sealing stability can be kept all the time even if the high-temperature resistant asbestos is used for sealing, on the other hand, the gaps of the parting strips are consistent, the surfaces of the two sides of the gaps of the parting strips are kept horizontal, high-temperature flue gas can stably pass through, and fluctuation caused by uneven inner surfaces of the gaps can be avoided.

In some preferred embodiments, the parting strips in the steel fence are of a fan-shaped cavity structure, and cooling water is filled in the parting strips. Based on the fan-shaped structure, the steel fence is set to be provided with a water cooling structure, so that the influence on the action of the steel fence and the exertion effect of the steel fence due to the fact that the strength of the parting bead is weakened or deformed by high-temperature flue gas can be avoided. The inventor finds that the steel fence is easy to weaken or deform the strength of the parting bead in the use process, so that the action and effect of the parting bead are influenced, for example, when the strength of the parting bead of the steel fence is weakened, waste steel cannot be effectively trapped, when the parting bead is deformed, gaps are inconsistent, and further the high-temperature flue gas passing through each gap is different, so that more uniform and stable air flow cannot be formed, and the heat exchange effect is influenced.

Furthermore, a cooling water channel can be arranged in the rotating shaft of the steel fence, and the inside of the fan-shaped cavity structure is communicated with the cooling water channel, so that each parting bead in the steel fence is cooled by the cooling water of the rotating shaft, and the two sides of the rotating shaft extend out of the slope feeding groove, so that the cooling water is more convenient to pass. In addition, because the slope charging tank is in a structure with a water-cooled wall, the inside of the slope charging tank water-cooled structure can be directly communicated with a cooling water channel of the rotating shaft, and water is directly introduced into the slope charging tank for water cooling.

In some preferred embodiments, the end of each parting bead is provided with a finger, the width of the finger is consistent with the width of the parting bead along the direction of the rotation axis, as shown with reference to fig. 5, and the finger tip of the finger faces the feeding direction. In the embodiment, the claw is arranged at the tail end of the parting bead, and the claw and the parting bead are arranged at the same width to ensure the action and the function of the parting bead, and in addition, the claw tip of the claw can play a stirring role on materials, so that the situation that the materials are clamped between the bottom of the parting bead and the groove wall in the steel fence opening adjusting process, and the materials cannot continue to rotate and cannot semi-seal the slope charging groove can be prevented.

In some preferred embodiments, the horizontal charging section 6 comprises a U-shaped open initial section and a closed conveying section. A horizontal conveying belt is arranged at the whole bottom of the horizontal feeding section 6, a power driving device of the horizontal conveying belt is arranged outside the horizontal feeding section 6, and the horizontal conveying belt and the power driving device jointly form a horizontal conveying mechanism 7. In this embodiment, only horizontal feeding section 6 carries out the material through power drive horizontal conveyer belt mode and carries out the material transportation, relies on the material gravity to adopt the mode of freely sliding down to get into in the stove in the slope charging tank 4, compares with whole charging equipment all adopts the power transmission mode, has reduced the vibration damage to device and/or EAF stove because of power transmission brings, has prolonged life. In addition, the power driving device in the horizontal conveying mechanism 7 is externally arranged, so that the later maintenance is convenient.

It is further preferred that an effective barrier is provided between the open initial section of the U-shape of the horizontal charging section 6 and the closed delivery section to prevent a large amount of cold air from entering the suction opening 5 and to avoid causing the back flow of high temperature flue gas of the EAF furnace to be affected. Specifically, for example, a sealed feed gate is mounted at the inlet of the conveying section, the bottom of which is in close proximity to the material for effective blocking of the cold air of the initial section. The sealing feeding door is made of flexible materials, the top of the sealing feeding door is fixed with the top of the conveying section, and the bottom of the sealing feeding door is tightly attached to the material, for example, the sealing feeding door can be rotatably installed at the top of the conveying section through the top of the sealing feeding door, and when the material is tightly attached to the bottom of the sealing feeding door, the sealing feeding door can be driven to rotate along the advancing direction of the material, so that sealing is realized, cold air is blocked outside the conveying section, and the interference of the cold air on the flow direction of high-temperature smoke in a slope feeding groove is avoided.

The invention also provides a feeding method of the EAF furnace, which adopts the continuous or intermittent scrap steel feeding device of the EAF furnace to feed, and comprises the steps of rotating a steel fence, intercepting materials sliding down in a slope feeding tank, enabling the materials to be piled up in the slope feeding tank from bottom to top, starting a flue gas recovery device, enabling high-temperature flue gas in the furnace to enter the slope feeding tank and exchange heat with the materials in the slope feeding tank, discharging the flue gas through an induced draft port after the heat exchange, rotating the steel fence, and releasing the materials sliding down in the slope feeding tank, so that the materials can freely slide into the furnace for smelting.

The charging process is further described below with reference to fig. 1 to 3:

1) And hoisting the scrap steel to the U-shaped open initial section of the horizontal feeding section 6 by using hoisting equipment such as a magnetic disk crane, starting the horizontal conveying mechanism 7, and slowly conveying the scrap steel forwards by using a horizontal conveying belt. The shape of the initial section of the horizontal feeding section 6 is U-shaped and open, so that the blanking of the waste steel of the disc crane is facilitated, the second half section is of a closed structure, and a sealing feeding door is adopted between two ends for blocking. Furthermore, the length of the horizontal feed section 6 may be up to several tens or hundreds of meters, depending on the process layout requirements.

2) The horizontal conveying belt conveys the steel scraps to the entrance of the slope feeding tank 4, the slope feeding tank 4 is sealed, the steel scraps directly slide down along the feeding channel by means of self gravity, wherein the telescopic rod of the hydraulic cylinder is controlled to stretch out and draw back from the outside of the device, and the rotating angle of the steel fence 2 in the slope feeding tank 4 is adjusted based on the action of the coaxial connecting rod so as to intercept or release operation.

For example, the rod end of the telescopic rod of the driving power hydraulic cylinder 3 stretches out, the rotating shaft in the steel fence 2 rotates anticlockwise, meanwhile, the parting bead is driven to rotate anticlockwise, so that the waste steel can be accumulated in the slope charging tank 4 from bottom to top in advance in a blanking channel of the semi-closed slope charging tank 4 (shown in figure 1), meanwhile, the steel fence 2 is in an equidistant parting strip shape, so that high-temperature smoke gas during smelting of the EAF furnace cannot be hindered to pass through gaps among the parting bead of the steel fence, the air suction inlet 5 is connected with a dust removing fan for recycling external smoke gas, and under the action of huge negative pressure, the high-temperature smoke gas of the EAF furnace can flow to the air suction inlet along the slope charging tank 4 and the waste steel gaps accumulated in the slope charging tank, and at the moment, the waste steel can be heated by using the high temperature of the smoke gas. When a certain process requirement is met, for example, when the scrap steel is preheated to a certain temperature, the rod end of the telescopic rod of the power hydraulic cylinder 3 is driven to retract, so that the telescopic rod drives the rotating shaft in the steel fence 2 to act clockwise, and meanwhile, the parting bead is driven to rotate clockwise, so that a channel in the slope feeding groove 4 is opened, the preheated scrap steel can freely slide into an EAF furnace molten pool, and smelting is continued in the EAF furnace.

For another example, if the smelting requires scrap steel without preheating, the steel fence 2 may be left open as described in FIG. 2, allowing the scrap steel to slide down the ramp feed tank 4 under its own weight and into the EAF furnace bath for smelting in the EAF furnace.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The continuous or intermittent scrap steel feeding device of the EAF furnace is characterized by comprising a horizontal feeding section and a slope feeding groove, wherein the lower end of the slope feeding groove is connected to an inlet of a furnace body, and the upper end of the slope feeding groove is communicated with the horizontal feeding section;

2. The EAF furnace continuous or intermittent scrap loading apparatus in accordance with claim 1 wherein the parting bead in the steel fence is a fan-like structure having a constant thickness.

3. The continuous or intermittent scrap steel feeding device for an EAF furnace according to claim 2, wherein the parting strips in the steel fence are of fan-shaped cavity structures, cooling water is filled in the cavity structures, the thickness of each fan-shaped cavity structure is the same, and gaps among the parting strips are consistent.

4. A continuous or intermittent scrap feeding device in an EAF furnace in accordance with claim 3 wherein a cooling water passage is provided in the interior of the rotating shaft, the interior of the fan-shaped cavity structure being in communication with the cooling water passage.

5. The EAF furnace continuous or intermittent scrap feed device in accordance with claim 2 wherein the ends of the parting bead are provided with fingers having a width that is consistent with the width of the parting bead in the direction of the axis of rotation and with the fingers pointed in the direction of feed.

6. The continuous or intermittent scrap feeding device for an EAF furnace according to claim 2, wherein the elongated hole in the top plate of the slope feeding trough has a size larger than that of the parting bead, the parting bead is centrally disposed in the elongated hole, a gap is formed between the elongated hole and the parting bead, a sealing strip is disposed along the inner side of the elongated hole for sealing the gap without affecting the rotation of the steel fence, and the sealing strip is high temperature resistant asbestos.

7. The continuous or intermittent scrap steel feeding device of an EAF furnace according to claim 2, wherein hydraulic cylinders are fixedly arranged on two sides of the outer portion of the slope feeding tank respectively, two ends of the rotating shaft extend out of the top of the slope feeding tank respectively and are connected with the end portions of telescopic rods of the hydraulic cylinders respectively through coaxial connecting rods, and the rotating shaft rotates through the telescopic rods of the hydraulic cylinders and drives the plurality of parting strips to synchronously rotate.

8. The continuous or intermittent scrap feeding device of an EAF furnace in accordance with claim 1 wherein the ramp feed tank is of closed construction, integrally provided with water cooled walls, and is of wear resistant and heat resistant material at the bottom and sides.

9. The EAF furnace continuous or intermittent scrap feeding apparatus in accordance with claim 1,

The bottom of the horizontal feeding section is provided with a horizontal conveying belt, and a power driving device of the horizontal conveying belt is arranged outside the horizontal feeding section;

The horizontal feeding section comprises a U-shaped open initial section and a closed conveying section, wherein a sealing feeding door is further arranged at the inlet of the conveying section, the bottom of the sealing feeding door is clung to materials, and the sealing feeding door is used for blocking cold air of the initial section.

10. An EAF furnace charging method, characterized by charging with the EAF furnace continuous or intermittent scrap charging device according to any one of claims 1-9, comprising: