Method for preventing materials from being broken in weighing hopper under blast furnace tank

Abstract

The invention discloses a method for preventing materials from being broken by a weighing hopper under a blast furnace tank, and relates to the technical field of metallurgical blast furnace ironmaking, and the method for preventing the materials from being broken by the weighing hopper comprises a weighing hopper body, a feeding pipe, a discharging pipe and a grading buffer structure, and the method for preventing the materials from being broken by the weighing hopper comprises the following steps: fixing a vibrating screen in the feeding pipe to screen the materials; first and second buffer channel steels are fixed in the weighing hopper through angle steel brackets, the first channel steel receives materials falling from the feeding pipe for preliminary deceleration, the second channel steel performs secondary deceleration, and impact is reduced in cooperation with a polyurethane lining plate; and controlling the speed of the buffered material to be less than or equal to 0.8 m / s, the impact force to be less than or equal to 500N and the breakage rate to According to the method for preventing the materials from being broken under the blast furnace tank, the problem that the materials are broken due to high fall of the weighing hoppers is solved, the proportion of the blast furnace entering the furnace is reduced by less than 10%, and the proportion of the blast furnace entering the furnace before and after use is reduced by 2-3%. And a foundation is laid for long-period stability of the blast furnace.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace ironmaking in metallurgical enterprises, in particular to a method for preventing material from being broken in a blast furnace under-bucket weighing hopper. BACKGROUND

[0002] The blast furnace under-bucket weighing hopper is a core equipment for accurately proportioning raw materials in a blast furnace in steel smelting, is installed below a blast furnace hopper, connects raw material conveying and blast furnace charging, is mainly made of Q345 / Q235 steel plate welding, the inner wall is lined with wear-resistant material to resist material wear, is equipped with high-precision weighing sensors and an electric control system, when working, raw materials fall into the weighing hopper from the hopper, the sensors collect weight data in real time, the feeding valve is automatically closed when the set value is reached, and then the quantitative raw materials are conveyed to the belt conveyor through the discharge valve and finally sent to the blast furnace, the capacity is designed according to the scale of the blast furnace, which can realize accurate proportioning of raw materials, reduce composition fluctuation and ensure stable blast furnace conditions, and is a key device for raw material metering control in steel production.

[0003] In the existing blast furnace under-bucket weighing hopper, such as the blast furnace under-bucket weighing hopper and the blast furnace with application number 202121930456.X, the technical scheme is that the blast furnace under-bucket weighing hopper comprises a hopper, an access door, a sealing element and a locking assembly, adjacent two side walls of the hopper are provided with corner inlets, the lower end of the hopper is provided with a discharge port, one side of the access door is rotatably connected to the hopper, the sealing element is arranged on the outer wall of the hopper, and the locking assembly comprises a locking ring and a latch, the latch can be inserted into the locking ring to block the access door outside the corner inlet.

[0004] However, the existing technology still has obvious defects: the height difference of the weighing hopper is large, the material is easily broken after being discharged through the vibrating screen due to the large free-fall impact, a large amount of fine material is generated, which not only reduces the utilization rate of the material, but also affects the permeability of the blast furnace, leading to fluctuation of the blast furnace conditions, and the proportion of the charged material cannot be stably reduced, the utilization rate of the material is limitedly improved, and it is difficult to meet the demand for long-period stable operation of the blast furnace.

[0005] Therefore, in view of the above problems, the present application is developed after in-depth research.

[0006] In view of the above problems, the original blast furnace under-bucket weighing hopper is innovatively designed. SUMMARY

[0007] The present application aims to provide a method for preventing material from being broken in a blast furnace under-bucket weighing hopper to solve the problems of high height difference of the weighing hopper, easy breaking of the material and low utilization rate of the material in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] The application discloses a method for preventing material from being broken in a blast furnace under-sluice weighing bucket, and belongs to the field of material weighing.

[0010] Step one: install the buffer, which comprises a first buffer channel steel and a second buffer channel steel, the first buffer channel steel is installed below the feeding pipe and inside the weighing bucket body, and the second buffer channel steel is installed inside the weighing bucket body and on the right side of the middle part;

[0011] Step two: fix the buffer, horizontally fix the first buffer channel steel on the front and back sides of the inside of the weighing bucket body, so that the length direction of the first buffer channel steel is consistent with the width direction of the discharge port of the feeding pipe, and the notch of the first buffer channel steel faces upward, and horizontally fix the second buffer channel steel on the front and back sides of the middle part of the inside of the weighing bucket body, so that the length direction of the second buffer channel steel is consistent with the side direction of the straight section, and the notch of the second buffer channel steel faces upward;

[0012] Step three: buffer and convey the material, the material is discharged from the discharge port of the feeding pipe after being screened by the internal vibrating screen of the feeding pipe, falls into the notch of the first buffer channel steel first, is slowed down by the first buffer channel steel, falls into the notch of the second buffer channel steel, is slowed down again by the second buffer channel steel, and then falls into the conical section of the weighing bucket body, so that the anti-breaking conveying is completed, and finally the material is discharged through the discharge pipe.

[0013] Preferably, the height of the weighing bucket body is 2.5 m, and the volume of the weighing bucket body is 3.5 m 3 .

[0014] By adopting the technical scheme, the weighing bucket body has a height of 2.5 m and a volume of 3.5 m 3 , which is suitable for the raw material metering requirement of a small and medium-sized blast furnace, avoids the extension of the material falling path caused by the too large volume of the weighing bucket, reduces the collision probability of 60% of the material and the inner wall, and further reduces the material breaking rate in cooperation with the buffer, and guarantees the raw material proportioning accuracy.

[0015] Preferably, the straight section is located above the conical section, the inner spaces of the straight section and the conical section are communicated, the height of the straight section is 1 m, and the height of the conical section with the gate is 1.5 m.

[0016] By adopting the technical scheme, the straight section is located above the conical section and the inner spaces are communicated, and the height of the conical section with the gate is 1.5 m, so that the material can smoothly slide along the inner wall of the conical section to the discharge pipe after being slowed down twice, and reasonable height distribution avoids the accumulation of the material in the straight section and prevents the broken material from being pressed.

[0017] Preferably, the vibrating screen is fixedly installed inside the feeding pipe, and the first buffer channel steel is located 350 mm below the discharge port of the feeding pipe.

[0018] By adopting the above technical scheme, the vibrating screen is fixedly installed inside the feeding pipe, so that the material can be screened first to remove impurities and oversized materials, thereby avoiding the impact of impurities on the buffer to cause buffer failure. The first buffer channel steel is located 350 mm below the discharge port of the feeding pipe, so as to accurately receive the falling material after screening and reduce the direct impact of the material on the straight section of the weighing hopper.

[0019] Preferably, the width of the first buffer channel steel is 500 mm, and the height of the first buffer channel steel is 200 mm.

[0020] By adopting the above technical scheme, the first buffer channel steel has a size of 500 mm in width and 200 mm in height, so that the slot area of the first buffer channel steel is matched with the area of the discharge port of the feeding pipe, and the falling material can be completely received, thereby improving the material buffer coverage rate. Meanwhile, the height of 200 mm can form sufficient buffer space, so that the falling speed of the material is reduced from the initial 3 m / s to ≤1.5 m / s, the impact force is reduced by 70%, and the material is prevented from being broken due to rigid collision with the channel steel.

[0021] Preferably, the second buffer channel steel is located on the right side of the bottom of the straight section, the width of the second buffer channel steel is 200 mm, and the height of the second buffer channel steel is 300 mm.

[0022] By adopting the above technical scheme, the second buffer channel steel is located on the right side of the bottom of the straight section, and has a size of 200 mm in width and 300 mm in height, so as to receive the falling material of the first buffer channel steel and reduce the falling difference of the material. The height of 300 mm can further reduce the speed of the material from ≤1.5 m / s to ≤0.8 m / s, so as to ensure that the impact force is ≤500 N when the material falls into the conical section.

[0023] Preferably, the first buffer channel steel is fixed by an angle steel support, one side of the angle steel support is welded and fixed to the inner side of the straight section, and the other side of the angle steel support is welded and fixed to the surface of the first buffer channel steel.

[0024] By adopting the above technical scheme, the first buffer channel steel is fixed by the angle steel support, and the other side is welded to the surface of the first buffer channel steel to form a stable triangular support structure, thereby improving the fixing strength. Even if the first buffer channel steel is impacted by the material for a long time, the displacement rate of the first buffer channel steel is low, so as to ensure the stability of the buffer effect.

[0025] Preferably, a buffer lining plate is detachably laid in the slot of the first buffer channel steel, the buffer lining plate is made of polyurethane material, has a thickness of 15-20 mm, a Shore hardness of 55-65 HA, has a length consistent with that of the first buffer channel steel, and has a width 5-10 mm smaller than that of the slot of the first buffer channel steel. The buffer lining plate is fixed to the first buffer channel steel by means of a countersunk screw.

[0026] Adopting the technical scheme, the polyurethane buffer lining plate in the notch of the first buffer channel steel can convert the rigid collision of the material and the channel steel into elastic contact, reduce the material breakage rate, the lining plate is detachable and is fixed through the countersunk screw, and buffer failure caused by aging of the lining plate is avoided.

[0027] Preferably, the falling speed of the material after being buffered by the first buffer channel steel is ≤1.5 m / s, the falling speed of the material after being buffered by the second buffer channel steel is ≤0.8 m / s, and the maximum impact force of the material when falling into the cone section of the weighing hopper body is ≤500 N, so that the material breakage rate is ensured to be <1%.

[0028] Adopting the technical scheme, the precise speed and impact force control can avoid material breakage to reduce the <10% proportion of the blast furnace, and the <10% proportion of the blast furnace before and after use is reduced by 2-3%, the permeability of the blast furnace is increased, and a foundation for long-period stability of the blast furnace is laid.

[0029] Compared with the prior art, the method for preventing material breakage of the blast furnace channel lower weighing hopper has the beneficial effects that:

[0030] 1. Gradual buffering and impact reduction solve the problem of material breakage: through the gradual buffering of the first buffer channel steel and the second buffer channel steel, in combination with the polyurethane buffer lining plate, the material falling speed is reduced from the initial 3 m / s to ≤0.8 m / s, the impact force is controlled to be ≤500 N, the material breakage rate is <1%, the generation of fine materials is reduced compared with the traditional non-buffering mode, the angle steel support ensures the stable fixation of the buffer member, avoids displacement to cause buffer failure, and completely solves the problems of high drop of the weighing hopper and easy breakage of the material;

[0031] 2. Precise adaptation and strong practicality ensure efficient and stable production: the buffer member is precisely adapted to the weighing hopper body, the pre-screening of the vibrating screen is combined with the gradual receiving of the buffer member, the material buffering coverage is improved, the material retention and overflow are reduced, the detachable design of the lining plate reduces the maintenance cost, the <10% proportion of the blast furnace is reduced, the <10% proportion of the blast furnace before and after use is reduced by 2-3%, the permeability of the blast furnace is increased, and a foundation for long-period stability of the blast furnace is laid. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is an appearance structure schematic diagram of the present application;

[0033] Figure 2 It is an overall rear structure schematic diagram of the present application;

[0034] Figure 3 It is a cross-sectional structure schematic diagram of the present application;

[0035] Figure 4 It is a front cross-sectional structure schematic diagram of the present application.

[0036] In the figure: 1, the weighing hopper body; 101, the straight section; 102, the tapered section; 2, the feeding pipe; 3, the discharging pipe; 4, the vibrating screen; 5, the first buffer channel steel; 6, the second buffer channel steel; 7, the angle steel support; 8, the buffer lining plate. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] Please refer to Figures 1-4 The present application provides a technical solution:

[0039] A method for preventing material from being broken in a weighing hopper under a blast furnace tank, comprising a weighing hopper body 1, a feeding pipe 2 arranged above the weighing hopper body 1, and a discharging pipe 3 arranged at the bottom of the weighing hopper body 1, the weighing hopper body 1 comprising a straight section 101 and a tapered section 102, and the method for preventing material from being broken in the weighing hopper comprising the following steps:

[0040] Step one, installing a buffer, the buffer comprising a first buffer channel steel 5 and a second buffer channel steel 6, the first buffer channel steel 5 being installed below the feeding pipe 2 and located inside the weighing hopper body 1, and the second buffer channel steel 6 being installed at the right side of the middle of the inside of the weighing hopper body 1;

[0041] Step two, fixing the buffer, the first buffer channel steel 5 being fixed horizontally on the front and back sides of the inside of the weighing hopper body 1 so that the length direction of the first buffer channel steel 5 is consistent with the width direction of the discharge opening of the feeding pipe 2, and the notch of the first buffer channel steel 5 faces upward, and the second buffer channel steel 6 being fixed horizontally on the front and back sides of the middle of the inside of the weighing hopper body 1 so that the length direction of the second buffer channel steel 6 is consistent with the side direction of the straight section 101, and the notch of the second buffer channel steel 6 faces upward;

[0042] Step three, material buffering and conveying, the material being discharged from the discharge opening of the feeding pipe 2 after being screened by the vibrating screen 4 inside the feeding pipe 2, falling into the notch of the first buffer channel steel 5 first, being slowed down by the first buffer channel steel 5, falling into the notch of the second buffer channel steel 6, being slowed down again by the second buffer channel steel 6, and then falling into the tapered section 102 of the weighing hopper body 1, completing the anti-breaking conveying, and finally being discharged through the discharging pipe 3.

[0043] The height of the weighing hopper body 1 is 2.5 m, and the volume of the weighing hopper body 1 is 3.5 m 3The straight section 101 is located above the conical section 102, and the internal spaces of the straight section 101 and the conical section 102 are communicated, the height of the straight section 101 is 1 m, the height of the conical section 102 with a gate is 1.5 m, the height of the weighing hopper body 1 is 2.5 m, and the volume is 3.5 m 3 The size design is suitable for the raw material metering requirement of a small and medium-sized blast furnace, avoids the extension of the material falling path caused by the too large volume of the weighing hopper, reduces the collision probability of the material and the inner wall by 60%, and further reduces the material breaking rate by cooperating with the buffer, guarantees the raw material proportioning accuracy, the straight section 101 is located above the conical section 102 and is internally communicated, the structure that the height of the conical section 102 with a gate is 1.5 m enables the material to smoothly slide along the inner wall of the conical section 102 to the discharge pipe 3 after being buffered twice, and the reasonable height distribution avoids the material accumulation in the straight section 101 and prevents the broken material under pressure.

[0044] The vibrating screen 4 is fixedly installed in the inside of the feeding pipe 2, the first buffer channel steel 5 is located below the feeding pipe 2 discharge port by 350 mm, the width of the first buffer channel steel 5 is 500 mm, the height of the first buffer channel steel 5 is 200 mm, the first buffer channel steel 5 is fixed by the angle steel support 7, one side of the angle steel support 7 is welded and fixed with the inside of the straight section 101, the other side of the angle steel support 7 is welded and fixed with the surface of the first buffer channel steel 5, the buffer lining plate 8 can be detachably laid in the notch of the first buffer channel steel 5, the buffer lining plate 8 is made of polyurethane material, the thickness is 15-20 mm, the Shore hardness is 55-65 HA, the length of the buffer lining plate 8 is consistent with the length of the first buffer channel steel 5, the width is smaller than the notch width of the first buffer channel steel 5 by 5-10 mm, and the buffer lining plate 8 is fixed with the first buffer channel steel 5 by the countersunk screw, the vibrating screen 4 is fixed in the inside of the feeding pipe 2, and the material can be screened first to remove impurities and oversized materials, so as to avoid the buffer failure caused by the impurities impacting the buffer, the first buffer channel steel 5 is located below the feeding pipe discharge port by 350 mm, can accurately receive the falling material after screening, reduces the case that the material directly impacts the straight section 101 of the weighing hopper, the size of the first buffer channel steel 5, that is, the width of 500 mm and the height of 200 mm, the notch area is adapted to the area of the feeding pipe 2 discharge port, can completely receive the falling material, improves the material buffer coverage, and the height of 200 mm can form sufficient buffer space, so that the material falling speed is reduced from the initial 3 m / s to ≤1.5 m / s, the impact force is reduced by 70%, avoids the material breaking caused by the rigid collision of the material and the channel steel, the first buffer channel steel 5 is fixed by the angle steel support 7, one side of the angle steel support 7 is welded with the inside of the straight section 101, and the other side is welded with the surface of the first buffer channel steel 5, so as to form a stable triangular support structure and improve the fixing strength, even if the channel steel is impacted by the material for a long time, the displacement rate is low, the buffer effect is stable, the polyurethane buffer lining plate 8 in the notch of the first buffer channel steel 5 can convert the rigid collision of the material and the channel steel into elastic contact, reduces the material breaking rate, the lining plate is detachable and is fixed by the countersunk screw, avoids the buffer failure caused by the aging of the lining plate.

[0045] The second buffer channel steel 6 is located at the bottom right side of the straight section 101, and the width of the second buffer channel steel 6 is 200mm, and the height of the second buffer channel steel 6 is 300mm, the second buffer channel steel 6 is located at the bottom right side of the straight section 101, and the width of 200mm and the height of 300mm can receive the falling material of the first buffer channel steel 5, reduce the falling difference of the material, and the height of 300mm can further reduce the material speed from ≤1.5m / s to ≤0.8m / s, and ensure that the impact force is ≤500N when the material falls into the cone section 102.

[0046] The falling speed of the material in step three is ≤1.5m / s after being buffered by the first buffer channel steel 5, and the falling speed of the material is ≤0.8m / s after being buffered by the second buffer channel steel 6, and the maximum impact force of the material when falling into the cone section 102 of the weighing hopper body 1 is ≤500N, which ensures that the breakage rate of the material is <1%, and the precise speed and impact force control can avoid the generation of fine materials due to falling and breaking, reduce the <10% proportion of the blast furnace, and reduce the <10% proportion of the blast furnace before and after use by 2-3%, increase the permeability of the blast furnace, and lay a foundation for long-period stability of the blast furnace.

[0047] Working principle:

[0048] When the application is used,

[0049] Preparation stage: confirm that the straight section 101 and the cone section 102 of the weighing hopper body 1 are installed in place, the feeding pipe 2 and the discharge pipe 3 are respectively connected to the upper and lower ends of the weighing hopper, the vibrating screen 4 is fixed inside the feeding pipe 2, and the screening surface is aligned with the discharge port of the feeding pipe;

[0050] Buffer installation and fixing stage:

[0051] Install the first buffer channel steel 5 with a width of 500mm and a height of 200mm: at a position 350mm below the discharge port of the feeding pipe 2, fix the first buffer channel steel 5 horizontally inside the weighing hopper body 1 through the angle steel support 7 on the front and rear sides, ensure that the slot is upward, and the length direction is consistent with the width of the discharge port of the feeding pipe 2;

[0052] Install the second buffer channel steel 6 with a width of 200mm and a height of 300mm: at the bottom right side of the straight section 101, fix the second buffer channel steel 6 horizontally inside the weighing hopper on the front and rear sides, ensure that the slot is upward, and the length direction is consistent with the side of the straight section 101;

[0053] Install the buffer lining plate 8: fix the polyurethane lining plate in the slot of the first buffer channel steel 5 through the countersunk screw, and ensure that the lining plate is flat without gaps;

[0054] The material buffer conveying stage: the material enters through the feeding pipe 2, is screened through the vibrating screen 4 first, removes impurities and oversized materials, and is discharged from the discharge port. The material first falls onto the lining plate of the first buffer channel steel 5, the speed is reduced to ≤1.5 m / s after elastic buffering, then slides along the channel steel slot, the sliding material falls into the second buffer channel steel 6, the speed is reduced to ≤0.8 m / s after buffering again, and finally falls smoothly into the cone section 102. When the material in the weighing hopper reaches the set weight, the gate of the discharge pipe 3 is opened, the material slides along the cone section 102 to the discharge pipe 3 and is discharged, and the anti-breaking conveying is completed.

[0055] The maintenance stage: check the wear of the buffer lining plate 8 every 15-30 days, replace it if the wear is ≥5 mm, check the welded part of the angle steel support 7, repair welding if the weld cracks, ensure that the position of the buffer part is not displaced, and ensure that the subsequent buffering effect is stable.

[0056] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0057] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for preventing material breakage in a weighing hopper under a blast furnace trough, comprising a weighing hopper body (1), wherein a feed pipe (2) is provided above the weighing hopper body (1), and a discharge pipe (3) is provided at the bottom of the weighing hopper body (1), wherein the weighing hopper body (1) includes a straight section (101) and a conical section (102), characterized in that: The method for preventing materials from breaking in the weighing hopper includes the following steps: Step 1: Install the buffer components. The buffer components include a first buffer channel steel (5) and a second buffer channel steel (6). The first buffer channel steel (5) is installed below the feed pipe (2) and is located inside the weighing hopper body (1). The second buffer channel steel (6) is installed in the middle right side of the weighing hopper body (1). Step 2: Fix the buffer components. Horizontally fix the first buffer channel steel (5) to the front and rear sides inside the weighing hopper body (1), so that the length direction of the first buffer channel steel (5) is consistent with the width direction of the feed pipe (2) discharge port, and the groove of the first buffer channel steel (5) faces upward. Horizontally fix the second buffer channel steel (6) to the middle front and rear sides inside the weighing hopper body (1), so that the length direction of the second buffer channel steel (6) is consistent with the side direction of the straight section (101), and the groove of the second buffer channel steel (6) faces upward. Step 3, material buffering and conveying: After being screened by the vibrating screen (4) inside the feed pipe (2), the material is discharged from the discharge port of the feed pipe (2), first falling into the groove of the first buffer channel steel (5), and after being buffered and decelerated by the first buffer channel steel (5), it falls into the groove of the second buffer channel steel (6), and after being buffered and decelerated a second time by the second buffer channel steel (6), it falls into the cone section (102) of the weighing hopper body (1), completing the anti-drop and breakage conveying, and finally unloading through the discharge pipe (3).

2. The method for preventing material breakage in a weighing hopper under a blast furnace trough according to claim 1, characterized in that: The weighing hopper body (1) has a height of 2.5m and a volume of 3.5m³. 3 .

3. The method for preventing material breakage in the weighing hopper under the blast furnace trough according to claim 2, characterized in that: The straight section (101) is located above the conical section (102), and the internal spaces of the straight section (101) and the conical section (102) are connected. The height of the straight section (101) is 1m, and the height of the conical section (102) with the gate is 1.5m.

4. The method for preventing material breakage in a weighing hopper under a blast furnace trough according to claim 1, characterized in that: The vibrating screen (4) is fixedly installed inside the feed pipe (2), and the first buffer channel steel (5) is located 350mm below the feed outlet of the feed pipe (2).

5. A method for preventing material breakage in a weighing hopper under a blast furnace trough according to claim 4, characterized in that: The width of the first buffer channel steel (5) is 500mm, and the height of the first buffer channel steel (5) is 200mm.

6. The method for preventing material breakage in the weighing hopper under the blast furnace trough according to claim 1, characterized in that: The second buffer channel steel (6) is located on the right side of the bottom of the straight section (101), and the width of the second buffer channel steel (6) is 200mm, and the height of the second buffer channel steel (6) is 300mm.

7. The method for preventing material breakage in a weighing hopper under a blast furnace trough according to claim 1, characterized in that: The first buffer channel steel (5) is fixed by an angle steel bracket (7). One side of the angle steel bracket (7) is welded to the inner side of the straight section (101), and the other side of the angle steel bracket (7) is welded to the surface of the first buffer channel steel (5).

8. A method for preventing material breakage in a weighing hopper under a blast furnace trough according to claim 7, characterized in that: A buffer liner (8) can be detachably laid in the groove of the first buffer channel steel (5). The buffer liner (8) is made of polyurethane material with a thickness of 15-20mm and a Shore hardness of 55-65HA. The length of the buffer liner (8) is the same as the length of the first buffer channel steel (5), and the width is 5-10mm smaller than the groove width of the first buffer channel steel (5). The buffer liner (8) is fixed to the first buffer channel steel (5) by countersunk screws.

9. A method for preventing material breakage in a weighing hopper under a blast furnace trough according to claim 1, characterized in that: In step three, the falling speed of the material after being buffered by the first buffer channel steel (5) is ≤1.5m / s, and the falling speed after being buffered by the second buffer channel steel (6) is ≤0.8m / s. The maximum impact force of the material when it falls into the cone section (102) of the weighing hopper body (1) is ≤500N, ensuring that the material breakage rate is <1%.

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