Automatic conveying device for continuous preheating in waste steel smelting

Abstract

An automatic conveying device for continuous preheating in waste steel smelting comprises a waste steel apron machine, a hopper is arranged at the input end of the waste steel apron machine, a weighing turnover hopper is arranged on one side of the hopper, and a fuel gas cover is arranged above the weighing turnover hopper. The fuel gas cover is pushed by the electric-hydraulic push rod to move back and forth above the weighing overturning hopper and the hopper; a rotary vibration chute is arranged at the output end of the waste steel apron machine, and the rotary vibration chute rotates leftwards and rightwards and feeds preheated waste steel into different smelting furnaces; a movable dust collecting cover is arranged above the head of the scrap steel apron machine, the rotary vibration chute and the melting furnace, the upper portion of the movable dust collecting cover is connected with a dust remover assembly through a smoke pipe, and the output end of the dust remover assembly is communicated with the interior of a hopper of the scrap steel apron machine through an air duct. According to the automatic conveying device for continuous preheating in waste steel smelting, continuous conveying and preheating of a waste steel apron machine can be achieved, the smelting time is shortened, the production efficiency is improved, and meanwhile energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to a scrap steel conveying device, in particular to an automatic conveying device for continuous preheating of scrap steel smelting. Background Art

[0002] As a major energy consumer in the industrial field, the steel industry is one of the projects with the greatest potential for energy conservation and emission reduction in my country. Therefore, the steel industry has become a key and difficult area for energy conservation and emission reduction in the whole society. In the process of turning iron ore into steel, a large amount of carbon dioxide emissions and industrial wastewater, waste gas and waste residue emissions will be generated, and the environmental governance task is very heavy. Therefore, the recycling of scrap steel into the furnace has become the lowest carbon, environmentally friendly and efficient smelting method.

[0003] The existing scrap steel re-melting has the following defects: 1) Smelting room temperature scrap steel. Room temperature scrap steel can easily lower the furnace temperature and prolong the smelting time, resulting in excessive energy consumption and low production efficiency.

[0004] 2) Before steelmaking, the melting furnace needs to consume a lot of electricity and fuel to raise the temperature of the furnace body to drive the temperature of the scrap steel to near the melting point. Therefore, this preheating process takes a long time and is very energy-consuming. The surface of the scrap steel block contains a lot of moisture and oxides. Before steelmaking, the melting furnace consumes a certain amount of electricity and fuel to raise the temperature of the furnace body to preheat the scrap steel and volatilize these impurities. In addition, during the steelmaking process, the supply of scrap steel at room temperature will cause the temperature of the furnace to drop sharply, affecting the melting effect.

[0005] 3) Ordinary steel smelting has no requirements on the type of scrap steel. In order to reduce costs and pursue profits, scrap steel materials are basically from scrap iron in daily life, with light specific gravity, and are basically thin materials, briquettes of thin materials, planing materials, crushed materials, etc. However, the varieties recycled by special steel smelting can be recycled many times, and they are strictly screened and classified to achieve the purpose of effective composition and quality control production. The smelting involving scrap steel is divided into two types: full scrap steel smelting and optimized scrap steel and pig iron ratio smelting. The smelted scrap steel is basically unqualified steel billets, bread iron, old castings eliminated by factories, damaged alloy steel parts of large machinery products, etc., which are classified and classified into materials with no utilization value and can be recycled. Compared with the scrap steel materials used in ordinary steel smelting, these scrap steels used in special steel smelting have the following difficulties: larger pieces (because they are thick and difficult to break and shear, and oxygen cutting is difficult), heavier specific gravity, difficult to oxygen cut, incompressible, and have higher requirements for transportation. Therefore, in the process of smelting special steel in the furnace, it consumes more electricity and time to continuously heat the scrap steel into furnace water than smelting ordinary steel.

[0006] 4) In the actual smelting process, the flue gas emitted by the furnace is as high as several hundred degrees, which causes heat loss in vain. In addition, the power plant and coking plant supporting the steel plant will also generate huge heat loss and energy waste when working.

[0007] 5) The traditional feeding method is to use an overhead crane to feed the scrap steel piled on the ground to a horizontal vibrating conveyor or a feeding trolley on a high platform. The repeated round trips of the overhead crane to retrieve the materials are very cumbersome, time-consuming and labor-intensive, and are accompanied by the problem of high-altitude material falling and dust pollution after the overhead crane retrieves the materials.

[0008] The patent application number "202110455147.X" "A weighable and meterable melting furnace continuous feeding distribution device and method" is an invention patent applied for before this application. In the process of adaptation and application, the following problems still exist: 1) Because the smelting of special steel has very high requirements on the performance and intrinsic quality of various products, the temperature of molten steel must be strictly controlled and the composition and content of molten steel must be adjusted during the smelting process. The adjustment of molten steel composition is achieved by adding different types and weights of charge materials according to the steel grade. The defects of the original charging system 202110455147.X cannot meet the needs of smelting special steel.

[0009] 2) Temperature control is crucial in the smelting process of special steel. Using the feeding system 202110455147.X, the added materials are at room temperature. In the early and middle stages of smelting, a large amount of materials need to be added in batches to meet the capacity of a furnace of molten steel. The temperature of the furnace body is hard to preheat, and there is not much molten steel smelted in the furnace. Suddenly adding a large amount of room temperature materials will cause the furnace body to cool suddenly, which not only consumes energy, but also affects the quality of the molten steel due to insufficient smelting. If the steelmaking effect is not good, it will be returned to the furnace for re-smelting.

[0010] 3) The weighing principle of the feeding system 202110455147.X is: within the corresponding time period, the weighing element senses the instantaneous weight changes of the moving parts of the scale conveyor (the weighing system is installed under the scales and chains), and then records and accumulates these changes. The disadvantage is that the weighing system is installed under the moving parts, and the force transmitted by the moving parts sensed by the weighing element is constantly changing. At the same time, the different degrees of wear and deformation of each section of the scale and chain will cause the contact with the weighing element to fail easily, and it is impossible to provide accurate cumulative weighing information. Monitoring this dynamic weight change and accumulating the results itself has calculation accuracy errors. The weighed material also contains some impurities, which cannot meet the accuracy requirements of strict weight control in special steel smelting. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide an automatic conveying device for continuous preheating of scrap steel smelting, which adopts intelligent baking technology and continuous conveying and preheating technology of scrap steel scale machine, so as to realize the recycling of heat energy to heat scrap steel, efficiently bake scrap steel in large quantities, and bake the scrap steel to a set temperature within a specified time, so that it can be quickly melted when entering the melting furnace for smelting, shortening the smelting time, improving production efficiency, and at the same time reducing energy consumption, thereby further reducing the production cost of the enterprise.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is: A set of automatic conveying device for continuous preheating of scrap steel smelting comprises a scrap steel scale machine, the input end of which is provided with a hopper, the upper end of the whole formed by the scrap steel scale machine and the hopper is closed and the two ends are open; a weighing turning bucket is provided on one side of the hopper, a gas hood is provided above the weighing turning bucket, and the input end of the gas hood introduces excess gas from the coking plant; the gas hood is pushed to move back and forth above the weighing turning bucket and the hopper by an electro-hydraulic push rod; a rotating vibrating chute is provided at the output end of the scrap steel scale machine, the rotating vibrating chute rotates left and right and respectively feeds the preheated scrap steel to different melting furnaces; a mobile dust collecting hood is provided above the head of the scrap steel scale machine, the rotating vibrating chute and the melting furnace, the upper part of the mobile dust collecting hood is connected to the dust collector assembly through a smoke pipe, and the output end of the dust collector assembly is connected to the hopper of the scrap steel scale machine through an air duct.

[0013] A plurality of burners are arranged on the upper surface of the outer shell of the gas hood, and the burners are connected to the gas pipe, and the other end of the gas pipe introduces excess gas from the coking plant; a combustion-supporting fan is arranged on the end plate of the gas hood; a roller is installed at the lower end of the gas hood, and the roller moves along the track above the weighing tipping bucket and the hopper of the scrap steel scale machine.

[0014] The weighing tipping bucket comprises a supporting platform, a weighing sensor is arranged below the corner column of the supporting platform, a receiving hopper is arranged above the supporting platform, one end of the receiving hopper is rotatably connected to the supporting platform, and the other end is driven to rotate by a hydraulic cylinder.

[0015] The weighing and turning bucket opens toward one side of the hopper of the scrap steel scale machine, and a thermocouple is installed on the inner wall of the weighing and turning bucket.

[0016] The rotary vibration chute includes a chute body, in which a weight door device is installed. The weight door device includes a weight door. The upper end of the weight door is rotatably installed on the bearing seats on both sides of the chute body through a second rotating shaft; the lower end of the weight door is vertical and spaced a certain distance from the chute bottom plate.

[0017] A vibration motor is installed outside the chute body. The present invention provides an automatic conveying device for continuous preheating of scrap steel smelting, which has the following technical effects: 1) By setting up a gas hood, the gas hood can recycle the excess gas and oxygen in the coking plant to preheat the scrap steel, remove the moisture and oxides on the surface of the scrap steel, and at the same time heat the scrap steel to a certain temperature before entering the melting furnace. On the one hand, it shortens the smelting time and reduces energy consumption; on the other hand, it avoids the disadvantage of poor smelting quality caused by a sudden drop in the furnace temperature due to the entry of room temperature scrap steel, thus ensuring the smelting effect.

[0018] The specific explanation for the poor smelting quality caused by the sudden drop in temperature is as follows: during the process of smelting each furnace of molten steel, it is not completed by adding materials at one time. The subsequent addition of materials at room temperature will cause the original furnace temperature to drop suddenly, and it is necessary to extend the heating time to make the temperature reach the melting point of steel smelting, which is more energy-consuming. Improper control of the smelting temperature due to low melting temperature is not conducive to the melting of alloy elements and the uniform distribution after melting, and is not conducive to the discharge of gases and inclusions. It increases the tendency to form segregation, cold shut, and undercasting, affecting the quality of subsequent steel formation.

[0019] 2) By adopting a rotatable weighing and turning bucket, on the one hand, it has a weighing function, which can avoid damage or uneven force of the weighing element under the conveyor belt, ensure more accurate detection, and also facilitate the addition of suitable proportions of other elements for smelting special steel. On the other hand, the weighing and turning bucket has the function of storing scrap steel and turning the scrap steel into the scrap steel scale machine; In addition, compared with the traditional feeding method in which the overhead crane frequently takes materials and sends them to the feeding cart on the steelmaking platform, the feeding efficiency generated by the scrap steel scale machine with a weighing tipping bucket is currently the fastest, most efficient, least material and manpower-intensive, safest and most reliable feeding method.

[0020] The weighing and tipping bucket in the present application has the advantages of arbitrary spatial arrangement, large material storage capacity, full-load operation, feeding during operation, and start and stop operation at will. The efficiency of using a weighing and tipping bucket to feed the melting furnace is dozens of times that of the traditional tipping trolley feeding method in the past. The overhead crane can fill the material trough of the scrap steel scale machine with materials before the melting furnace is turned on or when it is idle in the middle to prepare for the next steelmaking, and most of the other time can be used for material sorting, transportation, and concentration in the scrap steel yard. Therefore, the scrap steel scale machine is equipped with a weighing and tipping bucket. After the weighing and tipping bucket is filled once, it can meet the feeding needs of the scrap steel scale machine for a long time. There is no saying that the material collection is very cumbersome and the operation is troublesome. On the contrary, it saves time and effort when feeding steelmaking, and the operation is continuous, stable, noiseless, dust-free and environmentally friendly.

[0021] Purpose of weighing and tipping hopper 2: When scrap steel is put in, the scrap steel is baked and removed of impurities to obtain accurate weight; to control the precise ratio of scrap steel and pig iron.

[0022] 3) By setting tracks above the weighing and flipping buckets and the hoppers of the scrap steel plate machine, the gas hood can be moved left and right along the tracks through rollers. The advantage is that when the gas hood slides to the top of the hopper of the scrap steel plate machine, the top of the scrap steel plate machine hopper is closed, and the top of the weighing and flipping bucket is open, which is convenient for the overhead crane to feed materials into the weighing and flipping bucket or for the weighing and flipping bucket to the hopper of the scrap steel plate machine and unloading materials. When the gas hood slides to the top of the hopper of the weighing and flipping bucket, the top of the weighing and flipping bucket is closed, and the top of the scrap steel plate machine hopper is open, which is convenient for baking the materials thrown into the weighing and flipping bucket. The moving track of the gas hood does not affect the feeding space, nor does it occupy the operating space of the yard materials. Combined with electronic control and sound and light alarm, it is easy to operate and has no safety hazards.

[0023] 4) The patent "A weighable and meterable continuous feeding and distributing device and method for a melting furnace" with application number "202110455147.X" is also provided with a rotating unloading chute. In patent 202110455147.X, the chute is arranged on a rotating base. After receiving the materials from the head of the slab conveyor, the materials are fed into the melting furnace respectively. The materials fall into the melting furnace and slide due to their own gravity being greater than the friction on the chute. Therefore, the angle of the chute is generally large, otherwise some light and thin materials and planed materials will not slide easily. The disadvantage is that when the pressed block material, the already heavy bar material, the bread iron, and the short-headed ingot slide down the chute, some of the materials will generate a large impact force when flying to the furnace wall, penetrate the furnace lining, and damage the furnace body. Therefore, the feeding process is very cautious, and protecting the furnace body is the top priority. In order to change this feeding situation, the angle of the chute in this application becomes smaller, and the angle with the horizontal plane is 0°-10°, which is close to flat, and vibration motors are provided on both sides of the chute. The exciting force generated by the vibration motor forces the material to jump forward at a constant speed in a small range along the bottom slope of the chute, and then vertically fall onto the material that has been added before the furnace is opened. This is gentler than the previous method and greatly reduces the damage to the furnace lining. A heavy hammer door is added to the chute to prevent the occasional material from falling from the scale conveyor and directly rushing into the melting furnace without the vibration of the chute.

[0024] 5) By setting up a mobile dust collecting hood, the high-temperature exhaust gas from the melting furnace can continuously flow through the input section of the scrap steel scale machine, and then be moved out from the output end of the scrap steel scale machine. Since the scrap steel scale machine has only two openings, this can realize the recycling of the flue gas from the melting furnace and the heating of the scrap steel, further increasing the temperature of the scrap steel, while effectively utilizing the waste heat and saving energy.

[0025] 6) In order to facilitate air suction and collection, the height of the integrated hood is lower than that of the trolley; by setting the mobile dust collection hood as a mobile structure, it is convenient to move it when the furnace body fails for major maintenance or replacement, and it is convenient for the trolley to operate. When working, the mobile dust collection hood remains stationary. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is the front view of the present invention.

[0027] Figure 2 It is a top view of the present invention (removing the movable dust collecting cover).

[0028] Figure 3 for Figure 1 A partial enlarged schematic diagram of the weighing tipping bucket in the untipped state.

[0029] Figure 4 for Figure 1 A partially enlarged schematic diagram of the flipping state of the weighing flip bucket.

[0030] Figure 5 It is the front view of the weighing and tipping bucket in the present invention.

[0031] Figure 6 It is a cross-sectional view of the scrap steel scale machine in the present invention.

[0032] Figure 7 It is the front view of the rotary vibration chute in the present invention.

[0033] Figure 8 It is the front view of the heavy hammer door device in the present invention.

[0034] Fig. 9 It is a schematic diagram of the transmission connection between the first gear and the second gear in the present invention.

[0035] In the figure: gas hood 1, combustion-supporting fan 1-1, burner 1-2, roller 1-3, weighing and turning bucket 2, electro-hydraulic push rod 3, scrap steel scale machine 4, rotary vibration chute 5, first melting furnace 6, arc track 7, second melting furnace 8, ladle 9, mobile dust collection hood 10, smoke pipe 11, dust collector assembly 12, air duct 13, first guide rail 2-1, receiving hopper 2-2, thermocouple 2-3, support platform 2-4, hydraulic cylinder 2-5, corner column 2-6, weighing sensor 2-7, first rotating shaft 2-8, second guide rail 4-1, cover plate 4 -2, thermal insulation cotton 4-3, tin foil plate 4-4, material guide trough 4-5, scale plate 4-6, arc track 7, driven wheel 5-1, base 5-2, rotating base 5-3, first gear 5-4, second gear 5-5, motor reducer 5-6, shock absorbing spring 5-7, chute body 5-8, chute bottom plate 5-9, heavy hammer door device 5-10, second rotating shaft 5-11, bearing seat 5-12, heavy hammer door 5-13, vibration motor 5-14. DETAILED DESCRIPTION

[0036] like Figure 1-4As shown, a set of automatic conveying device for continuous preheating of scrap steel smelting includes a gas hood 1. The upper surface of the shell of the gas hood 1 is provided with multiple burners 1-2. The burners 1-2 are connected to the gas pipe. The gas at the other end of the gas pipe is drawn from the excess gas of the coking plant. A combustion-supporting fan 1-1 is provided on the end plate of the gas hood 1. The combustion-supporting fan 1-1 can introduce external air and mix it with the gas in the pipeline for full combustion. By heating the weighing and turning bucket 2, the scrap steel in the weighing and turning bucket 2 is baked to remove impurities in the scrap steel. The impurities in the scrap steel mainly include a large amount of moist moisture attached to the surface of the material, rust produced by oxidation of the surface, and a small amount of crystal water and free water in the metal. After impurities are removed, the burning ash is taken out with the thick smoke by air blowing.

[0037] Rollers 1-3 are provided on both sides of the lower end of the gas hood 1, and a weighing and turning bucket 2 and a scrap steel plate machine 4 are provided below the gas hood 1. Tracks that connect to each other are provided on the upper edges of both sides of the weighing and turning bucket 2 and above the hopper of the scrap steel plate machine 4. The gas hood 1 can move left and right on the tracks above the weighing and turning bucket 2 and the hopper of the scrap steel plate machine 4 through the rollers 1-3. An electro-hydraulic push rod 3 is also installed above the hopper of the scrap steel plate machine 4. The other end of the electro-hydraulic push rod 3 is connected to the gas hood 1 and pushes the gas hood 1 to move left and right. In the process of the gas hood 1 moving left and right, the weighing and turning bucket 2 can be used to complete feeding, baking, and unloading.

[0038] like Figure 5 As shown, the weighing and turning bucket 2 includes a supporting platform 2-4, a weighing sensor 2-7 is provided below the corner column 2-6 of the supporting platform 2-4, and a receiving bucket 2-2 is provided above the supporting platform 2-4. The receiving bucket 2-2 is open at one end facing the bucket of the scrap steel scale machine 4 (no side panels are provided for side unloading) to facilitate unloading. The side (head) of the receiving bucket 2-2 facing the bucket of the scrap steel scale machine 4 is rotatably mounted on the supporting platform 2-4 through a first rotating shaft 2-8, and the tail of the receiving bucket 2-2 is driven by a hydraulic cylinder 2-5 to turn around the axis of the first rotating shaft 2-8.

[0039] In addition, the inner wall of the weighing and tipping bucket 2 is equipped with thermocouples 2-3, and the PCL control system is provided with a fixed temperature detected by the thermocouples at a specified time, which is convenient for temperature control.

[0040] Materials are fed into the weighing tipping bucket 2 through a steel grabber or an overhead crane. The weighing sensors 2-7 analyze and process the weight signals of the scrap steel in the bucket after impurities are removed each time, and the accumulated weight of materials required to be transported during the smelting of each furnace of molten steel is obtained, so as to accurately obtain the proportion when adding elements to the smelting of special steel.

[0041] The process of reading the weighing signal belongs to static weighing, which is different from the previous method of setting weighing elements under the conveyor belt. It avoids uneven force on the elements caused by the operation of the conveyor belt, and the accuracy rate can reach 0.3%.

[0042] Workers add materials to the receiving hopper 2-2: There are two types. One is the materials put into smelting in the early stage, and the proportion of different furnace materials is controlled manually. The other is that different alloys or reducing non-metals are added to the molten steel during the smelting process to remove impurities and purify. When a certain value is reached, the sound and light alarm next to the worker's operating position is triggered, prompting the worker to stop adding materials to the receiving hopper 2-2. At the same time, the PCL control system controls the action of the electro-hydraulic push rod 3, and the electro-hydraulic push rod 3 drives the gas hood 1 to move toward the weighing flip bucket 2.

[0043] After the weighing tipping bucket 2 detects that the gas hood 1 moves to the top of the receiving hopper 2-2, the PCL control system opens the gas valve of the gas pipe and ignites it, and starts the combustion-supporting fan 1-1 at the same time to bake the scrap steel in the receiving hopper 2-2.

[0044] When the specified time feedback detects that the scrap steel temperature in the receiving hopper 2-2 has not reached the set value, the PCL control system controls the burning intensity of the flame by adjusting the opening of the gas and oxygen valves to continue to delay heating the scrap steel.

[0045] When the temperature information fed back by thermocouple 2-3 reaches the temperature setting value, the PCL control system closes the gas and oxygen valves and the combustion-supporting fan respectively.

[0046] Start the electro-hydraulic push rod 3 and move the gas hood 1 to the top of the hopper of the scrap steel scale machine 4. When the proximity switch above the hopper of the scrap steel scale machine 4 detects that the gas hood 1 is in place, the weighing system reads the value of the scrap steel after preheating and enters it into the information statistics, and starts the hydraulic cylinder 2-5 of the weighing tipping bucket 2 and the scrap steel scale machine 4 at the same time. The hydraulic cylinder 2-5 slowly pushes the receiving hopper 2-2 upward to the designed angle, and the scrap steel in the receiving hopper 2-2 falls into the scrap steel scale machine 4 as the receiving hopper 2-2 rotates upward. After the specified time is reached, the PCL control system controls the hydraulic cylinder 2-5 to return to its position. When the proximity switch on the hydraulic cylinder 2-5 feeds back to the receiving hopper 2-2 to complete the rotation and return to its position, the sound and light alarm next to the worker's operating position is turned off to prompt the worker to feed the weighing tipping bucket 2 for the next scrap steel preheating transportation.

[0047] The PCL control system can intelligently control the movement of the gas hood 1, the heating process of the scrap steel, and the charging and unloading process of the weighing and tilting bucket 2 by collecting the weighing data and outputting the signal of the material level switch. At the same time, the PCL control system can realize remote real-time monitoring, automatic control and manual control of the charging, scrap steel baking and unloading process of the weighing and tilting bucket 2 by combining the editing of the process flow screen display and the monitoring display.

[0048] like Figure 1As shown, the scrap steel scale machine 4 is arranged in a C shape, and the material is taken from the ground and sent to the vicinity of the furnace mouth on the high platform. A hopper is provided at the tail end of the scrap steel scale machine 4. The width of the hopper is one and a half to two times that of the suction cup. The load-bearing capacity is based on the design requirements and the requirements of the weighing device, and it is generally turned over once every ten tons. The hopper is convenient for weighing and unloading the tipping bucket 2 and temporarily storing materials. The body of the scrap steel scale machine mainly adopts the heavy-duty scale machine in the patent "A weighable and meterable continuous feeding and distribution device and method for a melting furnace" with application number "202110455147.X".

[0049] The scrap steel scale machine has the advantages of starting with material, uniform feeding, and manual inching. It can not only meet the large amount of material feeding in the early stage of the furnace, but also meet the requirement of not excessive material replenishment in the later stage of the furnace. It can stop and start at will, and will not cause the situation where the material is scattered outside the furnace mouth and is difficult to clean, thereby wasting materials.

[0050] like Figure 6 As shown, the difference is that, based on the above-mentioned scrap steel scale machine, the upper end of the hopper of the scrap steel scale machine 4 and the upper end of the entire conveying body are closed with a cover plate 4-2 (steel plate), and the outside is wrapped with a heat-insulating cotton layer 4-3 and a tin foil layer 4-4 to reduce heat loss after preheating of the scrap steel.

[0051] Since the temperature of the furnace mouth is too high, the molten steel is easy to splash. The head of the scrap steel plate machine 4 is equipped with a driving device, and the driving device cannot be too close to the furnace mouth; if the material is unloaded from the head of the scrap steel plate machine, the position is too high, which also causes the material to easily damage the furnace body. Therefore, a rotating vibration chute 5 is provided at the front end of the scrap steel plate machine 4. One conveying line can feed the two furnaces respectively.

[0052] like Figure 7 As shown, the rotary vibration chute 5 includes a chute body 5-8 at the top, the lower end of which is mounted on a rotating base 5-3, and a shock absorbing spring 5-7 is provided between the chute body 5-8 and the rotating base 5-3, and the shock absorbing spring 5-7 can buffer and reduce the damage to the chute body 5-8 caused by the impact. The chute bottom plate 5-9 is arranged at a small angle, and vibration motors 5-14 are provided on both sides. The vibration motor 5-14 provides driving force to the chute body 5-8, thereby driving the scrap steel in the chute body 5-8 to resonate, and the scrap steel moves downward at a uniform speed along the chute bottom plate 5-9 with a small angle inclination of the chute body 5-8, and then falls into the furnace at a relatively low speed, which is relatively gentle and does not cause much damage to the furnace body.

[0053] like Figure 8As shown, a weight door device 5-10 is provided near the upper end of the chute body 5-8. The weight door device 5-10 can prevent the impact force of large pieces of material hitting the chute bottom plate 5-9 from being too large, causing the material to rush quickly to the furnace mouth. The weight door device 5-10 includes a weight door 5-13, and the upper end of the weight door 5-13 is rotatably mounted on the bearing seats 5-12 on both sides of the chute body 5-8 through a second rotating shaft 5-11. A certain distance is left between the lower end of the weight door 5-13 and the chute bottom plate 5-9, so as to control the layer height of the material layer. If the front end of the rotary vibration chute 5 is too close to the furnace mouth, the weight door device 5-10 can be made detachable and made of high temperature resistant material.

[0054] like Figure 7 , Fig. 9 As shown, the main part of the rotary vibration chute 5 is basically the same as the rotary discharge chute in the patent "A weighable and meterable melting furnace continuous feeding distribution device and method" with application number "202110455147.X" in terms of the principle of rotary drive, and can also feed multiple melting furnaces separately. Driving principle of the rotary vibration chute 5: The motor reducer 5-6 is installed on the rotating base 5-3, and the output end of the motor reducer 5-6 is vertically downwardly installed with the first gear 5-4. The second gear 5-5 has a built-in bearing, and the inner ring of the second gear 5-5 is an internal gear structure (gear ring). The inner ring of the second gear 5-5 is fixed to the base 5-2 by bolts, and the base 5-2 is fixed to the ground. The rotating base 5-3 is placed above the second gear 5-5, and the rotating base 5-3 is fixed to the outer ring of the second gear 5-5 by bolts. The inner ring and outer ring of the second gear 5-5 can rotate relative to each other. The first gear 5-4 and the second gear 5-5 form an internal meshing structure. When the motor reducer 5-6 is started, the first gear 5-4 drives the rotating base 5-3 and other mechanical structures above to rotate as a whole on the surface of the arc track 7.

[0055] The chute in the patent with application number "202110455147.X" is only suitable for conveying scrap steel at a short distance and a large angle, and the material is only suitable for conveying light, thin and broken materials. Based on "202110455147.X", our company has made a variety of upgrades to the rotary unloading chute. 1) Add a vibration device to improve the scrap steel conveying capacity, so that the length of the rotary vibration chute 5 can be increased, thereby increasing the distance from the furnace body to the scrap steel scale machine, protecting the head drive and head bearing device of the scrap steel scale machine from close contact with high temperature, increasing the service life of the scrap steel scale machine and reducing the failure rate of the head drive. 2) Set the inclination angle of the chute bottom plate 5-9 to be more gentle, and the inclination angle of the chute bottom plate 5-9 to the horizontal plane is about 0°-10°, so as to prevent scrap steel from flying directly into the furnace body and impacting the furnace body lining, causing damage to the furnace body; in addition, by setting up a heavy hammer door device, it is not only suitable for light and thin materials and broken materials, but also suitable for large pieces of materials that are thick, difficult to break and shear, and difficult to oxygen cut, ensuring that the device is suitable for the transportation of various types of materials, without worrying about the large impact of material inertia falling and damaging the furnace lining, thereby improving versatility.

[0056] like Figure 1 As shown, in addition, a mobile dust collecting cover 10 is provided above the head of the scrap steel scale machine 4, the rotating vibration chute 5, the melting furnaces (the first melting furnace 6, the second melting furnace 8, and the ladle 9. The left and right ends of the mobile dust collecting cover 10 are respectively provided with walking wheels 10.1, and the walking wheels 10.1 are located on the walking track.

[0057] The top of the mobile dust hood 10 is connected to the dust collector assembly 12 through the smoke pipe 11. After the high-temperature exhaust gas is filtered and impurities are removed by the dust collector of the dust collector assembly 12, it is sent to the air duct 13 by the fan on the dust collector assembly 12. The air duct 13 is connected to the cover plate 4-2 of the hopper of the scrap steel scale machine 4. The filtered high-temperature exhaust gas flows continuously through the scrap steel scale machine 4, so that the material of the scrap steel scale machine 4 is always kept in a high-temperature state, and the heat is not lost due to a distance of transportation. Finally, it overflows from the head of the scrap steel scale machine into the mobile dust hood, achieving the purpose of recycling and heating the scrap steel.

[0058] A set of automatic conveying method for continuous preheating of scrap steel smelting includes the following steps: Step 1: Add materials to the receiving hopper 2-2. When a certain material reaches a preset value, an audible and visual alarm is triggered next to the operation position, prompting you to stop adding materials to the receiving hopper 2-2.

[0059] Step 2, start the electro-hydraulic push rod 3, move the gas hood 1 to the top of the receiving hopper 2-2, and after the proximity switch detects that the gas hood 1 has moved to the top of the receiving hopper 2-2, open the gas valve of the gas pipe through the PCL control system and ignite it, and start the combustion-supporting fan 1-1 at the same time to bake the scrap steel in the receiving hopper 2-2.

[0060] Step 3: When the scrap steel temperature in the receiving hopper 2-2 does not reach the set value within the specified time, the PCL control system controls the burning intensity of the flame by adjusting the opening of the gas and oxygen valves to continue to delay heating the scrap steel; when the temperature information fed back by the thermocouple 2-3 reaches the temperature set value, the PCL control system closes the gas and oxygen valves and the combustion-supporting fan respectively.

[0061] Step 4, start the electro-hydraulic push rod 3, and move the gas hood 1 to above the hopper of the scrap steel scale machine 4; when the proximity switch above the hopper of the scrap steel scale machine 4 detects that the gas hood 1 is in place, the weighing system reads the value of the scrap steel after preheating and enters it into the information statistics, and at the same time starts the hydraulic cylinder 2-5 of the weighing tipping bucket 2 and the scrap steel scale machine 4; the hydraulic cylinder 2-5 slowly pushes the receiving hopper 2-2 upward to the designed angle, and the scrap steel in the receiving hopper 2-2 falls into the scrap steel scale machine 4 as the receiving hopper 2-2 rotates upward; after the specified time is reached, the PCL control system controls the hydraulic cylinder 2-5 to return to its position, and when the proximity switch on the hydraulic cylinder 2-5 feeds back to the receiving hopper 2-2 to complete the rotation and return to its position, the sound and light alarm next to the worker's operating position is turned off to prompt the worker to feed the weighing tipping bucket 2 for the next scrap preheating and transportation.

[0062] Step 5. When the material is running on the scrap steel scale machine 4, the filtered high-temperature exhaust gas continuously flows through the scrap steel scale machine 4 from the air duct 13, so that the scrap steel on the scrap steel scale machine 4 always maintains a high temperature state and does not lose heat due to transportation over a certain distance; the exhaust gas finally overflows from the head of the scrap steel scale machine 4 and enters the mobile dust collecting hood 10 again, thereby achieving the purpose of recycling and heating the scrap steel.

[0063] Step six, when the material enters the rotating vibrating chute 5 through the scrap steel scale machine 4, on the one hand, the driving force is given to the chute body 5-8 through the vibration motor 5-14, thereby driving the scrap steel in the chute body 5-8 to resonate, and the scrap steel moves downward at a uniform speed along the chute bottom plate 5-9 with a small angle inclination of the chute body 5-8, and then falls into the furnace at a relatively low speed. The method is relatively gentle and does not cause much damage to the furnace body; on the other hand, when large pieces of material hit the chute bottom plate 5-9, the weight door 5-13 is used to slow down the material to avoid causing the material to rush to the furnace mouth quickly and damage the inner lining of the furnace body.

Claims

1. An automatic conveying device for continuous preheating of scrap steel smelting, characterized by: It comprises a scrap steel scale machine (4), the input end of the scrap steel scale machine (4) is provided with a hopper, and the scrap steel scale machine (4) and the hopper constitute a whole with a closed upper end and open ends; A weighing and tilting bucket (2) is provided on one side of the hopper, and a gas hood (1) is provided above the weighing and tilting bucket (2). The input end of the gas hood (1) introduces excess gas from the coking plant; the gas hood (1) is pushed by an electro-hydraulic push rod (3) to move back and forth above the weighing and tilting bucket (2) and the hopper; a rotating and vibrating chute (5) is provided at the output end of the scrap steel scale machine (4), and the rotating and vibrating chute (5) rotates left and right and respectively feeds preheated scrap steel into different melting furnaces; a mobile dust collecting hood (10) is provided above the head of the scrap steel scale machine (4), the rotating and vibrating chute (5) and the melting furnace; the top of the mobile dust collecting hood (10) is connected to a dust collector assembly (12) through a smoke pipe (11), and the output end of the dust collector assembly (12) is connected to the hopper of the scrap steel scale machine (4) through an air duct (13).

2. The automatic conveying device for continuous preheating of scrap steel smelting according to claim 1 is characterized by: The upper surface of the outer shell of the gas hood (1) is provided with a plurality of burners (1-2), the burners (1-2) being connected to a gas pipe, the other end of which is used to introduce excess coal gas from the coking plant; a combustion-supporting fan (1-1) is provided on the end plate of the gas hood (1); a roller (1-3) is installed at the lower end of the gas hood (1), and the roller (1-3) moves along a track above the hopper of the weighing and turning bucket (2) and the scrap steel scale plate machine (4).

3. The automatic conveying device for continuous preheating of scrap steel smelting according to claim 1 is characterized by: The weighing and tilting bucket (2) comprises a supporting platform (2-4), a weighing sensor (2-7) is provided below a corner column (2-6) of the supporting platform (2-4), and a material receiving bucket (2-2) is provided above the supporting platform (2-4), one end of the material receiving bucket (2-2) is rotatably connected to the supporting platform (2-4), and the other end is driven to rotate by a hydraulic cylinder (2-5).

4. The automatic conveying device for continuous preheating of scrap steel smelting according to claim 3 is characterized by: The weighing and turning bucket (2) opens toward one side of the hopper of the scrap steel scale machine (4), and a thermocouple (2-3) is installed on the inner wall of the weighing and turning bucket (2).

5. The automatic conveying device for continuous preheating of scrap steel smelting according to claim 1 is characterized by: The rotary vibration chute (5) comprises a chute body (5-8), a weight door device (5-10) is installed in the chute body (5-8), the weight door device (5-10) comprises a weight door (5-13), the upper end of the weight door (5-13) is rotatably installed on bearing seats (5-12) on both sides of the chute body (5-8) through a second rotating shaft (5-11); the lower end of the weight door (5-13) is vertical and spaced a certain distance from the chute bottom plate (5-9).

6. The automatic conveying device for continuous preheating of scrap steel smelting according to claim 5 is characterized by: A vibration motor (5-14) is installed on the outside of the chute body (5-8).

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