A safe and environmentally friendly scrap steel adding device for blast furnace hot metal tank

Abstract

The invention discloses a safe and environmentally friendly scrap steel adding device for a blast furnace molten iron tank, which comprises a charging hopper, a receiving hopper, a guide pipe and a guide pipe angle adjustment device, wherein the charging hopper is hung on a steel wire rope of a crane, the receiving hopper is fixed on a platform of an iron-making field through a tripod, the feed inlet at the upper part of the receiving hopper is opposite to the discharge port of the charging hopper, a material flow valve is arranged at the lower discharge port, the guide pipe is located below the receiving hopper, the upper opening of the guide pipe is opposite to the discharge port of the receiving hopper and is rotatably connected to the receiving hopper through a connecting plate, the lower opening is opposite to the tank opening of a molten iron torpedo tank, and the guide pipe angle adjustment device is connected to the guide pipe. The invention first puts the scrap steel into the receiving hopper, and then uses the material flow valve to control the scrap steel to flow into the molten iron in the molten iron torpedo tank through the guide pipe according to the set material flow speed, which can not only avoid the explosion accident caused by excessive one-time addition of scrap steel, but also reduce the instantaneous generation of smoke and dust, and avoid environmental pollution.

Description

Technical Field

[0001] The invention relates to a device for adding scrap steel into a blast furnace molten iron tank, belonging to the technical field of metallurgical equipment. Background Art

[0002] With the development of economy and society, the amount of scrap steel generated has gradually increased, and the methods of recycling scrap steel have also been increasing. Among them, adding small pieces of scrap steel directly into the iron tank containing molten iron, soaking, heating and melting the scrap steel with high-temperature molten iron, mixing it with the molten iron in the tank to form new molten iron, and then supplying it to the next process for steelmaking is a new method adopted in recent years. This method can quickly and economically increase the supply of molten iron and is widely used. However, since the molten iron tank is nearly ten meters high, it is necessary to use large equipment such as a crane and a crane to lift the scrap steel and then slowly add it to the molten iron in the tank. This method of adding scrap steel has many shortcomings: first, when adding scrap steel, the high-temperature molten iron is extremely easy to explode when it contacts the scrap steel, especially when a large amount is added at one time using large machinery, it is more likely to explode; second, after the scrap steel is added, the molten iron in the tank rolls and a large amount of smoke and dust is generated, and large machinery requires a wider site, which makes it difficult to collect the smoke and dust on site and easily pollutes the environment; finally, the added scrap steel is mostly bulk material, which cannot be hoisted in large quantities each time and is easy to spill, thereby greatly increasing the labor intensity of the workers. Therefore, it is very necessary to design a scrap steel adding device that can prevent explosion accidents, avoid smoke and dust pollution, and reduce the labor intensity of workers. Summary of the invention

[0003] The purpose of the present invention is to provide a safe and environmentally friendly scrap steel adding device for a blast furnace molten iron tank to address the shortcomings of the prior art, so as to prevent explosion accidents and avoid smoke and dust pollution of the environment.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A safe and environment-friendly scrap steel adding device for a blast furnace molten iron tank, comprising a charging hopper, a receiving hopper, a guide pipe and a guide pipe angle adjustment device, wherein the charging hopper is hung on a crane wire rope, the receiving hopper is fixed to a cast house platform by a tripod, the feed inlet at the upper part of the receiving hopper is opposite to the discharge port of the charging hopper, a material flow valve is provided at the lower discharge port, the guide pipe is located below the receiving hopper, the upper opening of the guide pipe is opposite to the discharge port of the receiving hopper and is rotatably connected to the receiving hopper through a connecting plate, the lower opening is opposite to the tank opening of a molten iron torpedo tank, and the guide pipe angle adjustment device is connected to the guide pipe.

[0006] The safe and environment-friendly scrap steel adding device for the blast furnace molten iron ladle also includes an exhaust and dust removal device, wherein the air suction port of the exhaust and dust removal device is located above the molten iron torpedo ladle.

[0007] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank is provided with a sealing valve below the material flow valve, and the sealing valve includes two left and right half valve plates, which are symmetrically arranged on both sides of the center line of the discharge port of the receiving hopper, and each half valve plate is rotatably connected to the side wall of the receiving hopper through a horizontal rotating shaft, and the end of the half valve plate located on the inner side of the receiving hopper can be rotated upward to the center line position of the discharge port, and the end located on the outer side of the receiving hopper is provided with a counterweight block, so that the two half valve plates close the discharge port under the action of the gravity of the counterweight block.

[0008] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank, the receiving hopper is provided with a level measuring device, the level measuring device includes a level meter sealing cover and a level meter, the level meter sealing cover is a vertical long tube, the lower end of which is flush with the discharge port at the lower part of the receiving hopper, the upper end is closed and higher than the furnace table, the level meter is fixed on the level meter sealing cover, and the probe of the level meter is inserted into the measuring hole in the middle of the upper end of the level meter sealing cover.

[0009] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank, the material guide pipe angle adjustment device is a hand-cranked winch, the hand-cranked winch includes a non-return pawl, a crank, a ratchet, a rope winding shaft and a hoisting wire rope, the rope winding shaft is rotatably connected to the material level meter sealing cover, the crank is fixed to one end of the rope winding shaft, the hoisting wire rope is wound on the rope winding shaft, and its two ends are respectively connected to the two ends of the upper opening of the material guide pipe, the ratchet is fixed on the rope winding shaft, the non-return pawl is rotatably connected to the material level meter sealing cover, and the claw tip of the non-return pawl is opposite to the teeth on the ratchet.

[0010] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank, the cross-sectional shape of the material guide pipe is rectangular, and a vertical short pipe with a cross-sectional shape consistent with the material guide pipe is provided at the lower discharge port of the receiving hopper. The material guide pipe is movably connected to the vertical short pipe through a connecting plate, and the material flow valve and the sealing valve are both installed on the vertical short pipe.

[0011] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank, the material flow valve includes a horizontal valve plate, and the valve plate is inserted into a slot at the lower discharge port of the receiving hopper.

[0012] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank, the charging hopper is a rectangular hollow hopper, with a charging port on the top, a discharge port on the front, a rear hanging ear at the rear, and side hanging ears on the left and right sides, and the rear hanging ear and the side hanging ears are connected to the overhead crane wire rope.

[0013] The above-mentioned safe and environmentally friendly scrap steel adding device for the blast furnace molten iron tank is provided with a fixed pulley on the vertical short pipe at the discharge port of the receiving hopper, and the hoisting wire rope passes around the fixed pulley and is connected to the guide pipe.

[0014] In the above-mentioned safe and environment-friendly scrap steel adding device for the blast furnace molten iron tank, the cross-sectional shape of the sealing cover of the level meter is rectangular.

[0015] The present invention firstly puts the scrap steel into a receiving hopper, and then uses a material flow valve to control the scrap steel to flow into the molten iron in the molten iron torpedo tank through a material guide pipe at a set material flow speed. This can not only avoid an explosion accident caused by adding too much scrap steel at one time, but also reduce the instantaneous generation of smoke and dust, avoiding environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is the three-view drawing of the loading hopper, among which Figure 2 (a) is the main view, Figure 2 (b) is the left view, Figure 2 (c) is a top view;

[0019] Figure 3 It is a top view of the receiving hopper;

[0020] Figure 4 There are three states of the material guide device: Figure 4 (a) is the vertical state of the guide tube. Figure 4 (b) is the state where the material guide tube swings to the left. Figure 4 (c) The guide tube is in the right swing state;

[0021] Figure 5 It is a schematic diagram of the structure of the material flow valve, where Figure 5 (a) is the main view, Figure 5 (b) is the left view;

[0022] Figure 6 It is a schematic diagram of the structure of the sealing valve, where Figure 6 (a) is the sealing valve closed state, Figure 6 (b) The sealing valve is in the open state;

[0023] Figure 7 It is a schematic diagram of the structure of the guide tube angle adjustment device, where Figure 7 (a) is the main view, Figure 7 (b) is a top view.

[0024] The numbers in the figure are as follows: 1. Receiving hopper, 2. Level meter, 3. Check pawl, 4. Crank, 5. Hand winch, 6. Sealing cover of level meter, 7. Fixed pulley, 8. Winch wire rope, 9. Tripod, 10. Material flow valve, 11. Sealing valve, 11-1. Half valve plate, 11-2. Horizontal rotating shaft, 11-3. Counterweight, 12. Connecting plate, 13. Material guide pipe, 14. Overhead crane wire rope, 15. Rear hanging ear, 16. Loading hopper, 17. Scrap steel, 18. Side hanging ear, 19. Iron-making yard platform, 20. Exhaust dust removal device, 21. Molten iron torpedo tank, 22. Molten iron, 23. Ratchet, 24. Rope winding shaft. DETAILED DESCRIPTION

[0025] The invention provides a safe and environment-friendly scrap steel adding device for a blast furnace molten iron tank, which makes it difficult to explode when adding scrap steel, does not raise dust on site, and reduces the workload, thereby ensuring that the scrap steel adding work is safe, environment-friendly, and easy.

[0026] See attached Figure 1 The present invention mainly includes a loading hopper 16, a receiving hopper 1 with a flow valve 10 and a sealing valve 11 installed at the bottom of the hopper, a hand-cranked winch 5, an exhaust dust removal device 20 and a material guide pipe 13. The hand-cranked winch 5 with a ratchet can swing the material guide pipe 13 to a desired position through a hoisting wire rope.

[0027] See attached Figure 1 and attached Figure 2 The charging hopper 16 is a rectangular shaped hopper with an inner hollow. Its bottom plate, left plate, right plate and rear plate are made of steel plates and welded together. The front side is left empty to form a discharge port, and the upper part is left empty for loading. Side hanging ears 18 are welded on the outer sides of the left plate and the right plate, and a rear hanging ear 15 is welded on the rear of the rear plate. When in use, the rear hanging ear 15 and the side hanging ear 18 of the charging hopper 16 are hung on the overhead crane wire rope 14, and the scrap steel 17 in the charging hopper 16 is directly hoisted and poured into the receiving hopper 1.

[0028] See attached Figure 3 To Attachment Figure 6The upper part of the receiving hopper 1 is in the shape of an inverted quadrangular pyramid, and the lower part of the pyramid is connected to a vertical short tube with a rectangular cross-section to form a discharge port. The upper end of the vertical short tube is provided with a movable valve plate that can be randomly checked, constituting a flow valve 10 for controlling the flow rate of the material; a sealing valve 11 is provided below the flow valve 10, and the sealing valve 11 includes two left and right half valve plates 11-1, each half valve plate 11-1 is rotatably connected to the side wall of the receiving hopper 1 through a horizontal rotating shaft 11-2 and a counterweight block 11-3 is provided at one end extending out of the receiving hopper 1. Under normal circumstances, under the action of the gravity of the counterweight block 11-3, the two half valve plates 11-1 rotate to the matching position, so that the sealing valve 11 is in a closed state. When unloading, the two half valve plates 11-1 rotate to a separated state under the pressure of the scrap steel 17, so that the sealing valve 11 is opened. A movable connecting plate 12 is installed in the middle of the left and right sides of the vertical short tube at the bottom of the receiving hopper 1, which is used to connect the material guide pipe 13 below. Two fixed pulleys 7 for traction and hoisting wire ropes are installed at both ends of the left and right sides of the vertical short tube. A level meter sealing cover 6 is provided at the rear of the receiving hopper 1 for installing the level meter 2. The level meter sealing cover 6 is a vertical long tube, the lower end of which is flush with the vertical short tube at the bottom of the receiving hopper 1, and the upper end is about 60 cm higher than the furnace table. The cross-sectional shape is rectangular, the upper end of the vertical long tube is closed, which is used to fix the level meter 2, and a round hole is opened in the middle, which is just the right size for inserting the probe of the level meter 2.

[0029] The hand-cranked winch 5 and the material guide pipe 13 constitute a material guide device. The material guide pipe 13 is a swingable long tube with a rectangular cross-sectional shape. The cross-sectional size is consistent with the vertical short tube at the bottom of the receiving hopper 1. The middle position on the left and right sides is movably connected to the vertical short tube at the bottom of the receiving hopper 1 through a movable connecting plate 12. Rope holes are left at both ends of the left or right side of the upper opening of the material guide pipe 13 for fixing the winch wire rope 8. The hand-cranked winch 5 is installed on the left or right side of the material level meter sealing cover 6, and includes a non-return pawl 3, a crank handle 4, a ratchet 23, a rope shaft 24 and a hoisting wire rope 8. The rope shaft 24 is rotatably connected to the material level meter sealing cover 6, the crank handle 4 is fixed to one end of the rope shaft 24, the hoisting wire rope 8 is wound on the rope shaft 24, and its two ends are connected to the material guide pipe 13, the ratchet 23 is fixed to the rope shaft 24, the non-return pawl 3 is fixed to the material level meter sealing cover 6, and the claw tip of the non-return pawl 3 is opposite to the teeth on the ratchet 23. When the hand crank handle 4 is manually cranked, the hoisting wire rope 8 can be pulled through the rope shaft 24 to adjust the material guide pipe 13 to a desired position.

[0030] During the iron tapping process, when the exhaust dust removal device 20 above the molten iron torpedo tank 21 has been opened, the discharge port of the material guide pipe 13 is first aligned with the tank port of the molten iron torpedo tank 21 by the hand-cranked winch 5, and then the scrap steel in the loading hopper 16 is poured into the receiving hopper 1, and then the flow valve 10 is opened and the opening size is controlled. The scrap steel presses the sealing valve 11 open under the action of gravity, and flows directly into the molten iron 22 in the molten iron torpedo tank 21 through the material guide pipe 13 according to the required material flow rate. During the process of adding scrap steel 17, the exhaust dust removal device 20 continues to exhaust air, and the material guide pipe 13 below the sealing valve 11 and the material level meter 2 of the material level meter cover 6 are both in a negative pressure state, which avoids the overflow of smoke and dust and protects the on-site environment. After adding the scrap steel, the material flow valve 10 is closed, and the sealing valve 11 is automatically closed.

[0031] During any process of adding scrap steel 17, the crank handle 4 can be shaken to rotate the hand winch 5 with a ratchet, which can be rotated forward or reversely. The guide pipe 13 under the movable connecting plate 12 can be adjusted to the required position through the winch wire rope 8. After adjustment, the check pawl 3 can be moved to fix the hand winch 5.

[0032] In this embodiment, each blast furnace is equipped with 4-10 charging hoppers according to the amount of scrap steel added and the frequency of use. The outer dimensions of the charging hopper are 1 length * width * height, which is about 2m * 1m * 0.5m. Each charging hopper can hold about 5 tons of scrap steel. It is welded with 20mm steel plates, and the front end can be designed to be constricted, so that the scrap steel 17 can be poured into the receiving hopper 1. Lifting ears are welded on three sides of the charging hopper, which is convenient for hanging the overhead crane wire rope 14. When loading, the charging hopper 16 pours the scrap steel into the receiving hopper 1 under the lifting of the overhead crane wire rope 14, realizing large-scale lifting.

[0033] According to the number of tapholes, each blast furnace is equipped with 12 to 6 receiving hoppers, and the tapholes for maintenance may not be equipped. During installation, the guide pipe 13 is directly inserted into the charging port above the molten iron torpedo tank 21, and the receiving hopper is directly supported on the tapping platform 19 through the tripod 9. The receiving hopper is in the shape of a chamfered table, which is slightly lower near the charging hopper, so as to facilitate the pouring of scrap steel 17. When adding scrap steel 17, the opening size of the material flow valve 10 can be adjusted as needed to ensure that the material flow speed is appropriate.

[0034] The guide pipe 13 is connected to the receiving hopper 1 through a movable connecting plate 12. The guide pipe 13 can be flexibly swung left and right. At any time when adding scrap steel 17, the handle 4 can be shaken to rotate the hand-cranked winch 5 with a ratchet to swing the guide pipe 13 to the optimal position. After it is adjusted, the check pawl 3 can be turned to lock the hand-cranked winch 5 to guide the scrap steel 17 to the required position in the molten iron torpedo tank.

[0035] The present invention makes the operation of adding scrap steel to the blast furnace iron can, which is labor-intensive and has potential safety and environmental pollution hazards, become time-saving, labor-saving, safe and environmentally friendly. The whole bucket of scrap steel is directly added to the iron can by using an overhead crane, which saves time and labor and can increase the amount of addition; the scrap steel is dispersed, added in batches and added to the molten iron torpedo can at the required speed by the present invention, reducing the risk of explosion caused by centralized addition; the dust removal system ensures negative pressure in the device, avoids smoke pollution and improves the on-site environment.

Claims

1. A safe and environmentally friendly scrap steel adding device for a blast furnace molten iron tank, characterized in that: It comprises a charging hopper (16), a receiving hopper (1), a guide pipe (13) and a guide pipe angle adjustment device, wherein the charging hopper (16) is hung on a crane wire rope (14), the receiving hopper (1) is fixed on a cast house platform (19) via a tripod (9), the feed inlet at the upper part of the receiving hopper (1) is opposite to the discharge outlet of the charging hopper (16), a material flow valve (10) is provided at the discharge outlet at the lower part of the receiving hopper (1), the guide pipe (13) is located below the receiving hopper (1), the upper opening of the guide pipe (13) is opposite to the discharge outlet of the receiving hopper (1) and is rotatably connected to the receiving hopper (1) via a connecting plate (12), the lower opening is opposite to the tank opening of a molten iron torpedo tank (21), and the guide pipe angle adjustment device is connected to the guide pipe (13); A sealing valve (11) is provided below the material flow valve (10), and the sealing valve (11) comprises two left and right half valve plates (11-1), which are symmetrically arranged on both sides of the center line of the discharge port of the receiving hopper (1), and each half valve plate (11-1) is rotatably connected to the side wall of the receiving hopper (1) via a horizontal rotating shaft (11-2). The end of the half valve plate (11-1) located on the inner side of the receiving hopper (1) can be rotated upward to the center line position of the discharge port, and the end located on the outer side of the receiving hopper (1) is provided with a counterweight block (11-3), so that the two half valve plates (11-1) close the discharge port under the gravity of the counterweight block (11-3); The receiving hopper (1) is provided with a material level measuring device, which comprises a material level meter sealing cover (6) and a material level meter (2). The material level meter sealing cover (6) is a vertical long tube, the lower end of which is flush with the discharge port at the lower part of the receiving hopper (1), and the upper end is closed and higher than the furnace table. The material level meter (2) is fixed on the material level meter sealing cover (6), and the probe of the material level meter (2) is inserted into the measuring hole in the middle of the upper end of the material level meter sealing cover (6); The material guide pipe angle adjustment device is a hand-cranked winch (5), the hand-cranked winch (5) comprising a non-return pawl (3), a crank handle (4), a ratchet (23), a rope winding shaft (24) and a hoisting wire rope (8), the rope winding shaft (24) being rotatably connected to a material level meter sealing cover (6), the crank handle (4) being fixed to one end of the rope winding shaft (24), the hoisting wire rope (8) being wound around the rope winding shaft (24), and the two ends of the rope winding shaft being respectively connected to the two ends of the upper opening of the material guide pipe (13), the ratchet (23) being fixed to the rope winding shaft (24), the non-return pawl (3) being rotatably connected to the material level meter sealing cover (6), and the claw tip of the non-return pawl (3) being opposite to the teeth on the ratchet (23); The material flow valve (10) comprises a horizontal valve plate, and the horizontal valve plate is inserted into a slot at the lower discharge port of the receiving hopper (1).

2. The safe and environmentally friendly scrap steel adding device for a blast furnace hot metal tank according to claim 1, characterized in that: It also includes an exhaust dust removal device (20), wherein the air suction port of the exhaust dust removal device (20) is located above the molten iron torpedo tank (21).

3. The safe and environmentally friendly scrap steel adding device for a blast furnace hot metal tank according to claim 2, characterized in that: The cross-sectional shape of the material guide pipe (13) is rectangular. A vertical short pipe with a cross-sectional shape consistent with that of the material guide pipe (13) is provided at the lower discharge port of the receiving hopper (1). The material guide pipe (13) is movably connected to the vertical short pipe via a connecting plate (12). The material flow valve (10) and the sealing valve (11) are both mounted on the vertical short pipe.

4. A safe and environmentally friendly scrap steel adding device for a blast furnace hot metal tank according to claim 3, characterized in that: The loading hopper (16) is a rectangular hopper with a hollow interior, having a loading port at the top, a discharge port at the front, a rear hanging ear (15) at the rear, and side hanging ears (18) at the left and right sides. The rear hanging ear (15) and the side hanging ears (18) are connected to the overhead crane wire rope (14).

5. A safe and environmentally friendly scrap steel adding device for a blast furnace molten iron tank according to claim 4, characterized in that: A fixed pulley (7) is provided on the vertical short tube at the discharge port of the receiving hopper (1), and the hoisting wire rope (8) passes around the fixed pulley (7) and is connected to the material guide pipe (13).

6. A safe and environmentally friendly scrap steel adding device for a blast furnace hot metal tank according to claim 5, characterized in that: The cross-sectional shape of the material level meter sealing cover (6) is a rectangle.

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