Fire grate bar

Abstract

The utility model discloses a fire grate bar, and belongs to the technical field of ironmaking furnace charge sintering equipment in the metallurgical industry field. The utility model aims to solve the problem that the existing fire grate bar is easy to bend, deform and break at high temperature. According to the technical scheme, the fire grate bar is of a double-side triangular structure and comprises a center main body part and two triangular supporting parts connected to the two sides of the center main body part respectively, the stability of the triangular structure is good, and thermal stress and mechanical stress at high temperature can be effectively resisted; and bending deformation and breakage of the fire grate bar at high temperature are avoided. The fire grate bar has longer service life, the maintenance and replacement frequency is reduced, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sintering of iron-making furnace charge in the metallurgical industry, in particular to an improved grate bar. BACKGROUND

[0002] In the sintering process of the metallurgical industry, the grate bar, as a key component on the sintering machine trolley, plays an important role in carrying the sintering material and protecting the trolley. With the continuous progress of metallurgical technology and the increasing perfection of sintering process, the performance requirements of the grate bar are becoming higher and higher. The grate bar not only needs to withstand high temperature, high pressure and corrosion in harsh working environment, but also needs to have good durability, stability and heat conduction efficiency to ensure the smooth progress of the sintering process and the high-quality output of the sintering material.

[0003] According to the practical experience in the industry, the grate bar needs to withstand high temperature of 800-1050℃ in the sintering process, and the temperature decreases after unloading. The service condition is harsh, and the effect of high-temperature thermal cycle puts high requirements on the material selection, structure design and manufacturing process of the grate bar. At the same time, due to the large number of grate bars on the sintering machine trolley, about 150 tons of grate bars are usually needed for a sintering machine system, so the performance and stability of the grate bar are crucial to the operation of the entire sintering system.

[0004] However, the traditional grate bar has certain defects in the use process: due to the effect of high temperature, the strength of the grate bar decreases, which leads to serious bending of the middle part of the grate bar under the heavy pressure of the upper sintering material. This bending not only affects the uniform distribution of the material on the grate bar, leading to a decrease in sintering quality, but also may cause the fracture of the grate bar, resulting in material leakage. These problems not only affect the smooth progress of the sintering process, but also increase the maintenance cost and downtime, reduce the efficiency of the metallurgical blast furnace and the quality of the pig iron, so a new grate bar structure is urgently needed to solve these problems. CONTENT OF THE INVENTION

[0005] In view of the problems of strength decrease, bending deformation and even fracture of the existing grate bar in the use process, the present application aims to improve the structure of the grate bar to improve the carrying capacity, durability and heat conduction efficiency of the grate bar, so as to ensure the stability of the sintering process and the high-quality output of the sintering material.

[0006] The present application provides a grate bar, which specifically comprises a grate bar main beam, a grate bar end part and a grate bar hook, characterized in that the grate bar adopts a double-sided triangular structure, comprising a central main body part and two triangular support parts connected to the two sides of the central main body part respectively; wherein each triangular support part is composed of a grate bar vertical rod, a grate bar inclined rod and a grate bar main beam in cooperation.

[0007] Preferably, the two triangular support parts are symmetrically arranged on both sides of the central body part, and the top ends of the grate bar inclined rods of the two triangular support parts are supported in the middle part of the grate bar.

[0008] Preferably, each internal angle of the triangular support part is in a circular arc shape.

[0009] Preferably, the middle part of the triangular support part is in a hollow structure.

[0010] Preferably, the width of each side of the triangular support part is smaller than the width of other parts of the grate bar.

[0011] The force state of the grate bar main beam of the grate bar with the above structure is changed from the traditional bending stress to the tensile stress. Since the strength of the metal material under the tensile stress is much greater than the strength under the bending stress, the size of the height direction of the grate bar main beam and the vertical rod and the inclined rod can be greatly reduced, thereby reducing the weight of the grate bar. Meanwhile, the triangular structure has good stability and can effectively resist the thermal stress and mechanical stress under high temperature, thereby avoiding the bending deformation and fracture of the grate bar under high temperature.

[0012] According to the actual use, the beneficial effects are as follows:

[0013] Improved carrying capacity: since the triangular structure has good stability and the metal material has high strength under the tensile stress, the grate bar has higher carrying capacity and can effectively support the sintered material, thereby avoiding the bending deformation and fracture of the grate bar.

[0014] Reduced weight and energy consumption: the size of the grate bar main beam and the support part is reduced, so that the total weight of each grate bar is reduced by about 1 kg. For a 52 square meter sintering machine, the weight of the grate bar of each sintering machine system can be reduced by about 7-8 tons. This not only reduces the equipment load of the sintering machine, but also reduces the consumption of power energy.

[0015] Reduced cost: the reduction of the weight of the grate bar means that the purchase cost of the grate bar of each sintering machine system can be reduced by about 120,000 yuan, thereby significantly reducing the production cost.

[0016] Improved sintering quality and efficiency: the improvement of the structure of the grate bar avoids the bending deformation and fracture, thereby ensuring the uniform paving of the sintered material and the sintering quality and improving the stability and efficiency of the sintering process.

[0017] Extended service life: since the triangular structure has good stability and high strength, the grate bar has a longer service life, thereby reducing the frequency of maintenance and replacement and reducing the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the perspective view of the grate bar of the utility model.

[0019] Figure 2 is the front view of the grate bar of the utility model.

[0020] Figure 3 is the top view of the grate bar of the utility model.

[0021] Figure 4 is the side view of the grate bar of the utility model.

[0022] Label explanation: 001-grate bar main beam, 002-grate bar end, 003-grate bar hook, 004-grate bar vertical rod, 005-grate bar inclined rod. DETAILED DESCRIPTION

[0023] In order to realize the technical scheme of the present application, the following provides detailed implementation steps and specific structure description.

[0024] 1. Size and shape design:

[0025] Firstly, according to the specification size (such as length, width, etc.) of the sintering trolley, combined with the principle of the utility model, the specific shape and size of the grate bar are designed, and in view of the problem that the traditional grate bar is easy to bend and deform under high temperature, the grate bar is improved into a double-sided triangular structure, which comprises a center main body part (i.e. the grate bar main beam 001) and two triangular support parts connected to the two sides of the center main body part respectively, each triangular support part is composed of the grate bar vertical rod 004, the grate bar inclined rod 005 and the grate bar main beam 001 cooperated with each other, the top end of the inclined rod 005 is supported to the middle part of the grate bar, thereby forming a stable triangular structure, and this design can effectively improve the bending strength of the grate bar and avoid its bending and deformation under high temperature and heavy pressure.

[0026] 2. Drawing preparation:

[0027] According to the designed size and shape, the detailed drawing of the grate bar is drawn using drawing software, and the specific size, position relationship and assembly mode of each component should be clearly marked in the drawing, so as to ensure the smooth progress of subsequent production and installation.

[0028] 3. Mould design and production:

[0029] According to the drawn drawing of the grate bar, the mould for casting and producing the grate bar is designed and produced, and the production of the mould needs to ensure the size accuracy and surface quality, so as to ensure that the cast grate bar meets the design requirements, at the same time, the design of the mould should also consider the metal fluidity and cooling speed in the casting process, so as to ensure the quality and performance of the casting.

[0030] 4. Casting production:

[0031] Various smelting raw and auxiliary materials, such as metal raw materials, fluxes, etc., are purchased, and then the metal raw materials are melted into metal liquid using smelting equipment. During the smelting process, the smelting temperature and chemical composition need to be strictly controlled to ensure the quality and performance of the metal liquid. Next, the smelted metal liquid is poured into a mold for casting. After the metal liquid cools and solidifies, the castings are removed and subjected to sanding, polishing and other post-processing procedures. Finally, the castings are strictly inspected, including size measurement, appearance inspection, material analysis, etc., to ensure that the castings meet the design requirements and are qualified for storage.

[0032] 5. Installation and use:

[0033] The cast and inspected grate bars are installed on the pallets of the sintering machine. During installation, the fit accuracy and stability between the grate bars and the pallets need to be ensured to avoid problems such as loosening or deformation of the grate bars during use. At the same time, necessary adjustments and corrections need to be made to the installed grate bars to ensure their normal operation.

[0034] 6. Effect evaluation:

[0035] During the operation of the sintering machine, the sintering process using the grate bars of the present utility model is monitored and evaluated. By comparing the quality of the sintered material, sintering efficiency, service life of the grate bars, and number of equipment downtime maintenance before and after use, the actual effect of the present utility model is verified. Specifically, the temperature curve, sintering time, and excellent yield of sintered material during the sintering process can be recorded and compared with the data when using traditional grate bars. In addition, the service life of the grate bars can be tracked and recorded to evaluate their durability and reliability. Example One

[0036] The company has a 180 square meter sintering machine with a pallet specification of 3000x1000mm and 130 pallets. Each pallet is equipped with 200 grate bars, and the entire sintering system is equipped with 26,000 grate bars. After using the improved grate bars of the present invention, no bending deformation or fracture of the grate bars occurred during the sintering process, and the quality of the sintered material was significantly improved. At the same time, due to the reduction in the weight of the grate bars, the equipment load of the sintering machine was also reduced, thereby reducing the consumption of power energy. According to statistics, after using the improved grate bars, the entire sintering system can reduce the weight of the grate bars by about 25 tons, reducing the procurement cost by about 375,000 yuan. In addition, the service life of the grate bars is extended by 3 months compared to before the improvement, further reducing maintenance costs. Example Two

[0037] The group company also has a 52 square meter sintering machine, the trolley specification is long*wide=1800*1000mm, the trolley quantity is 77, 100 grate bars are installed on each trolley, the whole sintering system is provided with 7700 grate bars, the improved grate bar can reduce the weight of the grate bar by 7.7 tons, reduce the procurement cost by 120,000 yuan, the service life of the grate bar is prolonged by 3 months compared with before the improvement, the sintering quality of the furnace charge is guaranteed, the air leakage and material leakage phenomena do not appear in the sintering production, and the effect is good.

[0038] It should be noted that the above enumerated embodiments are only specific embodiments of the present application, apparently, the present application is not limited to the above embodiments, similar changes or modifications made from the disclosed content of the present application are directly derived or easily thought by those skilled in the art, and all should belong to the protection scope of the present application.

Claims

1. A grate bar comprising a grate bar main beam, a grate bar end portion and a grate bar hook, characterized in that, The grate bar adopts a double-side triangle structure, comprising a central main body part and two triangle support parts connected to the two sides of the central main body part respectively; wherein each triangle support part is formed by a grate bar vertical pole, a grate bar inclined pole and a grate bar main beam.

2. A grate bar according to claim 1, characterized in that The two triangle support parts are symmetrically arranged on the two sides of the central main body part, and the top end of the grate bar inclined pole of the two triangle support parts is supported to the middle part of the grate bar.

3. A grate bar according to claim 1 or claim 2, characterised in that, Each internal angle of the triangle support part is in a circular arc shape.

4. A grate bar according to claim 1 or claim 2, characterised in that, The middle part of the triangle support part is in a hollow structure.

5. A grate bar according to claim 1 or claim 2, characterised in that, The width of each side of the triangle support part is smaller than the width of other parts of the grate bar.

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