Bunker coal bucket and welding method thereof

Abstract

The invention relates to the technical field of thermal power engineering, and discloses a bin dividing coal bucket and a welding method thereof.The bin dividing coal bucket comprises a bin body and a bin dividing plate, and the inner wall of a bin body storage section is welded to the side, facing reinforcing rib profile steel in the bin dividing plate, of the bin dividing plate body; the inner wall of the storage section and the stainless steel coating on the other side of the plate body are welded and fixed through a transition welding rod, a stainless steel coating is arranged on the inner wall of the blanking section of the bin body, and the inner walls, close to the front ends and the rear ends of the inner stiffening rib profile steel, of the blanking section are welded and fixed to the two ends of the inner stiffening rib profile steel after the stainless steel coatings are scraped off; the inner wall of the blanking section is welded with one side, facing the inner stiffening rib profile steel, of the plate body through a transition welding rod, and the inner wall of the storage section is welded and fixed with the stainless steel coating on the other side of the plate body, so that the strength and durability of a welding joint are ensured, and the service life of the bin dividing coal bucket is effectively prolonged; and potential safety hazards caused by welding connection failure due to double-metal corrosion are obviously reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal power engineering, and in particular relates to a compartment coal hopper in a coal conveying system of a thermal power plant and a welding method thereof. Background Art

[0002] The power industry is a basic industry and public utility for national economic and social development, and power plants are places where electricity is generated. In my country, thermal power generation has the advantages of low site selection requirements, short construction period, strong power generation stability, low power generation costs and low on-grid electricity prices. In addition, my country has abundant coal resources, so thermal power generation has always dominated the power industry. The coal hopper is a key part of the fuel storage and transportation system of a thermal power plant. The coal blocks crushed by the coal crusher are transported to the coal bunker through a belt conveyor and temporarily stored in the coal hopper. The coal blocks are then fed to the pulverizer through a coal feeder to be ground into powder, and finally sent to the boiler burner.

[0003] The structural types of coal hoppers can be divided into reinforced concrete structures and steel structures, and the shapes of coal hoppers can be divided into round coal hoppers and square coal hoppers. The most commonly used in thermal power plants is the round steel coal hopper. The round steel coal hopper is usually divided into an upper straight section and a lower conical section in height. The straight section is used to store most of the coal blocks, while the conical section facilitates the smooth discharge of coal blocks. The side walls of the coal hopper are generally made of rolled and welded steel plates. In order to improve the structural strength, an annular angle steel or channel steel is also set on the outside as a stiffening rib. Since the conical bucket section needs to withstand a large friction force of coal blocks, the existing technology improves the wear resistance of the conical bucket section bucket wall by welding a layer of stainless steel lining on the bucket wall lining. However, the welding between the traditional carbon steel or low alloy steel bucket wall and the stainless steel lining has the risk of bimetallic corrosion, which not only reduces the service life of the coal hopper, but also may pose a threat to the safe operation of thermal power plants. my country implemented the mandatory standard "General Specification for Steel Structures" in 2022, which clearly stipulates that stainless steel components should not be welded with carbon steel and low alloy steel components.

[0004] With the changes in the supply structure of coal resources in my country, large proportions of non-designed coal types have become the norm for coal-fired power generation units. In order to achieve accurate fuel blending and improve the economy, safety and environmental protection of unit operation, the split-compartment design of the coal hopper has become the choice of some power plants. The split-compartment design of the coal hopper can not only maximize the flexibility of coal type switching, but also meet the storage and transportation needs of different coal types.

[0005] The existing technology uses a steel tube external rib type compartment plate. The plate body of the steel tube external rib compartment plate is made of a stainless steel composite plate. Semicircular tubes symmetrically welded and arranged at intervals on both sides of the plate body serve as external stiffening ribs. After the construction of the compartment plate is completed, it is welded as a whole to the inside of the coal hopper. The split external ribs are made of carbon steel or low alloy steel components. The welding between the split external ribs and the split bin plate body, the welding between the split external ribs and the coal hopper cone bucket section, and the welding between the plate body and the side wall of the coal hopper straight tube section constitute direct welding of stainless steel components and carbon steel or low alloy steel components.

[0006] The welding between the split plate and the silo of the split coal hopper in the prior art is direct welding of stainless steel components and carbon steel or low alloy steel components. The long-term operation of bimetallic welding will gradually corrode the connection position and affect the connection strength. There are certain safety hazards and it cannot meet the requirements of the current specification "General Specification for Steel Structures". Summary of the invention

[0007] The technical problem to be solved by the present invention is: the welding between the split plate and the silo of the split coal hopper in the prior art is a direct welding of a stainless steel component and a carbon steel or low alloy steel component. The long-term operation of bimetallic welding will gradually corrode the connection position, affect the connection strength, and pose certain safety hazards.

[0008] In view of the above problems, the present invention proposes a divided-bin coal hopper, which includes a bin body and a divided-bin plate, the bin body includes a storage section and a material-dropping section connected up and down, the divided-bin plate is vertically arranged in the bin body and extends from the storage section to the bottom of the material-dropping section, and is characterized in that: the divided-bin plate includes a plurality of internal stiffening rib steels arranged in rows and intervals vertically and a plate body welded to the left and right sides of the internal stiffening rib steels, and the webs of each internal stiffening rib steel are horizontally placed;

[0009] The material of each inner stiffening rib steel is carbon steel or low alloy high strength steel, the material of the side of each plate body facing the inner stiffening rib steel is carbon steel or low alloy high strength steel, and the other side of each plate body is provided with a stainless steel coating;

[0010] The inner wall of the storage section is welded and fixed to both ends of each inner stiffening rib steel, the inner wall of the storage section is welded to the side of the plate body facing the inner stiffening rib steel, and the inner wall of the storage section is welded and fixed to the stainless steel coating of the plate body by a transition welding rod;

[0011] A stainless steel coating is provided on the inner wall of the blanking section, and the stainless steel coating is scraped off the inner wall of the blanking section close to the front and rear ends of each inner stiffening rib steel to be welded and fixed to the two ends of each inner stiffening rib steel;

[0012] The inner wall of the blanking section is welded to one side of the plate body facing the inner stiffening rib steel by a transition welding rod, and the inner wall of the storage section is welded and fixed to the stainless steel covering on the other side of the plate body.

[0013] Preferably, the material of the side wall of the blanking section is a stainless steel composite plate; the material of the plate body is a stainless steel composite plate;

[0014] Each stainless steel composite plate is made of a base layer and a cladding layer by a direct rolling method. The base layer is made of carbon steel or low-alloy high-strength steel, and the cladding layer is made of stainless steel.

[0015] Preferably, each inner stiffening rib steel is an I-beam or an H-beam.

[0016] Preferably, stiffening plates are provided in a ring shape on the outer sides of the side walls of the storage section and the blanking section corresponding to the relative positions of the internal stiffening rib steels.

[0017] Preferably, the thickness of the lower side wall of the storage section is greater than the thickness of the upper side wall of the storage section, so that the lower side wall of the storage section forms a thickened plate, the inner surface of the thickened plate is flush with the inner surface of the upper cylinder wall, and the blanking section is welded and fixed to the thickened plate.

[0018] The present invention also proposes a welding method for a coal hopper having a divided bunker, the steps of which are as follows:

[0019] S1. Prefabricate the storage section and blanking section of the warehouse body respectively, and weld and fix the top of the blanking section to the storage section;

[0020] S2. Weld and fix the two ends of each inner stiffening rib steel to the inner wall of the storage section and the blanking section respectively. Before welding, scrape off the stainless steel coating of the part to be welded in the blanking section;

[0021] S3, welding and fixing one side of each plate body made of carbon steel or low alloy high strength steel to the inner stiffening rib steel;

[0022] S4, welding and fixing the inner wall of the storage section to one side of the plate body facing the inner stiffening rib steel, and welding and fixing the inner wall of the storage section to the stainless steel coating on the other side of the plate body by using a transition welding rod;

[0023] S5. The inner wall of the blanking section is welded to the side of the plate body facing the inner stiffening rib steel by a transition welding rod, and the inner wall of the blanking section is welded and fixed to the stainless steel covering on the other side of the plate body.

[0024] Preferably, in step S1, the storage section and the blanking section of the bin body are prefabricated separately, and the top of the blanking section is welded and fixed to the storage section. Specifically,

[0025] A transition welding rod is used to weld the stainless steel coating on the inner wall of the blanking section to form a transition weld. A welding rod matching carbon steel or low-alloy high-strength steel is used to weld the inner wall of the blanking section and the inner wall of the storage section to form a common weld.

[0026] Preferably, in step S3, the carbon steel or low alloy high strength steel side of each plate body is welded and fixed to the inner stiffening rib steel section by:

[0027] The carbon steel or low-alloy high-strength steel side of each plate body is respectively covered on both sides of the inner stiffening rib steel, and then the plate body on one side of the stiffening rib steel is welded, and then the plate body on the other side is cut into grooves according to the spacing of each inner stiffening rib steel, and the stainless steel coating is exposed at the grooves. The inner wall of the blanking section and the inner wall of the storage section are welded with welding rods matching the carbon steel or low-alloy high-strength steel to form ordinary welds, and transition welding rods matching the stainless steel coating are used to weld transition welds, and stainless steel coating welding rods are used to weld stainless steel welds.

[0028] Preferably, in step S4, the inner wall of the storage section is welded to one side of the plate body facing the inner stiffening rib steel, and the inner wall of the storage section is welded to the stainless steel coating on the other side of the plate body by a transition welding rod. Specifically, the following steps are performed:

[0029] Ordinary welds are welded with electrodes matching carbon steel or low alloy high strength steel, and transition welds are welded with transition electrodes matching stainless steel cladding. The top surface of the transition weld is flush with the outer surface of the stainless steel cladding.

[0030] Preferably, in step S5, the inner wall of the blanking section is welded to the side of the plate body facing the inner stiffening rib steel by a transition welding rod, and the inner wall of the blanking section is welded to the stainless steel cladding on the other side of the plate body as follows:

[0031] Use transition electrodes that match the stainless steel coating to weld transition welds, and use stainless steel coating electrodes to weld stainless steel welds.

[0032] Compared with the prior art, the coal hopper and welding method thereof according to the embodiment of the present invention have the following beneficial effects:

[0033] Different metal materials are directly welded between different parts of the traditional coal bunker, so that the metal with higher potential becomes the positive electrode (cathode) and the metal with lower potential becomes the negative electrode (anode). In a humid, aerobic or corrosive environment (such as coal dust, moisture, etc.), the negative electrode metal undergoes oxidation reaction, which is called anode corrosion.

[0034] The present application fixes the inner wall of the storage section to the two ends of each inner stiffening rib steel by welding, the inner wall of the storage section is welded to the side of the plate body facing the inner stiffening rib steel, and the inner wall of the storage section is fixed to the stainless steel coating of the plate body by welding with a transition welding rod;

[0035] A stainless steel coating is provided on the inner wall of the blanking section, and the stainless steel coating is scraped off the inner wall of the blanking section close to the front and rear ends of each inner stiffening rib steel to be welded and fixed to the two ends of each inner stiffening rib steel;

[0036] The inner wall of the blanking section is welded to the side of the plate body facing the inward stiffening rib steel by a transition electrode, and the inner wall of the blanking section is welded and fixed to the stainless steel covering on the other side of the plate body, so that the parts of the different components of the compartment coal hopper with the same material can be directly welded, and the welding between the parts of different materials is carried out by scraping off the stainless steel covering or using transition electrodes for welding, thereby avoiding the problem of direct welding of different metal materials in the traditional compartment coal hopper, which is prone to electrochemical corrosion and leads to a decrease in the strength of the welding part, ensuring the strength and durability of the welded joint, effectively extending the service life of the compartment coal hopper, and significantly reducing the safety hazards caused by failure of welding connection due to bimetallic corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1. It is a top view of the coal hopper of the embodiment of the present invention;

[0038] Figure 2 is a vertical cross-sectional view of a coal hopper of a storage bin according to an embodiment of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the compartment plate of the compartment coal hopper according to an embodiment of the present invention;

[0040] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0041] Figure 5 Schematic diagram of the horizontal weld of the storage section stiffening plate and side wall of the coal bunker in the embodiment of the present invention;

[0042] Figure 6 Schematic diagram of the vertical weld on the side wall of the storage section of the coal bunker in the embodiment of the present invention;

[0043] Figure 7 Schematic diagram of vertical welds on the side wall of the thickened plate at the bottom of the storage section of the coal bunker in an embodiment of the present invention;

[0044] Figure 8 1. It is a schematic diagram of the peripheral structure of the lower thickened plate of the storage section of the coal bunker of the embodiment of the present invention;

[0045] Fig. 9 yes Figure 8 Middle AA section view;

[0046] Fig.10 yes Fig. 9 Middle BB section view;

[0047] Fig.11 Schematic diagram of horizontal welds on the side wall of the blanking section of the coal hopper in the bunker according to an embodiment of the present invention;

[0048] Fig.12 Schematic diagram of the vertical weld on the side wall of the blanking section of the coal hopper of the bunker according to the embodiment of the present invention;

[0049] Fig.13 Schematic diagram of a stiffening plate of a blanking section of a coal hopper in a bin according to an embodiment of the present invention;

[0050] Fig.14 It is a schematic diagram of the connection structure between the storage section and the material discharge section of the coal bunker in an embodiment of the present invention;

[0051] Fig.15 It is a schematic diagram of the connection structure between the stiffening rib steel in the compartment plate and the inner wall of the storage section according to an embodiment of the present invention;

[0052] Fig.16 It is a schematic diagram of the connection structure between the stiffening rib steel in the compartment plate and the inner wall of the blanking section in an embodiment of the present invention;

[0053] Fig.17 It is a schematic diagram of the connection structure between the stiffening rib steel and the plate body in the compartment plate according to an embodiment of the present invention;

[0054] Fig.18 yes Fig.17 Enlarged view of point A in the middle;

[0055] Fig.19 It is a schematic diagram of the connection structure between the compartment plate body and the inner wall of the storage section according to an embodiment of the present invention;

[0056] Fig. 20 It is a schematic diagram of the connection structure between the compartment plate body and the inner wall of the blanking section according to an embodiment of the present invention.

[0057] In the figure, 1, warehouse body; 2, partition plate; 3, storage section; 4, blanking section; 5, internal stiffening rib steel; 6, plate body; 7, stiffening plate; 8, thickening plate; 10, annular bottom plate; 11, annular horizontal stiffening plate; 12, rectangular vertical stiffening plate; 13, trapezoidal vertical stiffening plate; 14, triangular anti-fall support plate; 15, bolt hole; 16, connecting angle steel; 100, ordinary weld; 200, transition weld; 300, stainless steel weld. DETAILED DESCRIPTION

[0058] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0059] In the description of the present invention, it should be understood that the term "transition electrode" is used in the present invention. The transition electrode is a special type of electric welding rod, which is specially treated and can be applied to the welding of various metals. The main function of the transition electrode is to connect metal electrodes of different materials. There are significant differences in chemical composition and physical properties (such as thermal expansion coefficient, thermal conductivity, etc.) between metal electrodes of different materials. The use of the transition electrode can be used as a buffer to reduce welding problems caused by differences in chemical composition and physical properties, make the weld uniform and beautiful, and ensure the quality and reliability of the welded joint.

[0060] like Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention is a divided coal hopper, which includes a bin body 1 and a divided board 2. The bin body 1 includes a storage section 3 and a material drop section 4 connected up and down. The divided board 2 is vertically arranged in the bin body 1 and extends from the storage section 3 to the bottom of the material drop section 4. The divided board 2 divides the inner cavity of the bin body 1 into two, so that the maximum and flexibility of coal type switching can be achieved.

[0061] like Figure 3 and Figure 4 As shown, the compartment plate 2 includes a plurality of internal stiffening rib steels 5 arranged in vertical rows and spaced apart from each other and a plate body 6 welded to the left and right sides of the internal stiffening rib steels 5, and the webs of each internal stiffening rib steel 5 are placed horizontally.

[0062] The material of each inner stiffening rib steel 5 is carbon steel Q235 or low alloy high strength steel Q355, the material of the side of each plate body 6 facing the inner stiffening rib steel 5 is carbon steel Q355 or low alloy high strength steel Q355, and the thickness of each plate body 6 is generally 10mm to 12mm. By welding and fixing the plate body 6 and the inner stiffening rib steel 5 at the same material, bimetallic welding is avoided when the plate body 6 and the inner stiffening rib steel 5 are welded and fixed.

[0063] The other side of each plate body 6 is provided with a stainless steel coating, and the thickness of the stainless steel coating is generally 3 mm. Specifically, the plate body 6 is made of a stainless steel composite plate, the base material of the stainless steel composite plate is carbon steel Q235 or low alloy high strength steel Q355, the base plate thickness is generally 10 mm to 12 mm, and the coating material is stainless steel, and the coating plate thickness is generally 3 mm.

[0064] After adding the partition plate 2, the aspect ratio of each sub-cavity of the silo body 1 is doubled compared with the original silo body 1, and the lateral squeezing pressure on the side wall of each sub-cavity from the coal stored in the cavity will be greatly increased. Therefore, the partition plate 2 will be subjected to a larger load. By providing a stainless steel coating on the side of the plate body 6 facing the silo body 1, the wear resistance of the plate body 6 can be improved and the service life of the partition plate 2 can be increased.

[0065] like Fig.15 and Fig.19 As shown, the inner wall of the storage section 3 is welded and fixed to both ends of each inner stiffening rib steel 5, and the inner wall of the storage section 3 is welded to the side of the plate body 6 facing the inner stiffening rib steel 5, that is, the storage section 3 is directly welded to the side of the plate body 6 that is made of the same material; the inner wall of the storage section 3 is welded and fixed to the stainless steel coating on the other side of the plate body 6 by a transition electrode. Through the special setting of the welding parts, that is, the direct welding of the inner wall of the storage section 3 with the inner stiffening rib steel 5 and the side of the plate body 6 that is made of the same material, and the welding and fixing with the stainless steel coating on the other side of the plate body 6 by a transition electrode, the problems caused by bimetallic welding are effectively avoided, thereby ensuring the strength and stability of the welding parts, and improving the reliability and durability of the entire storage structure.

[0066] A stainless steel coating is provided on the inner wall of the blanking section 4 . The stainless steel coating is provided on the inner wall of the blanking section 4 , which significantly improves the wear resistance of the blanking section and prolongs the service life of the blanking section 4 .

[0067] like Fig.16 and Fig. 20 As shown, the blanking section 4 scrapes off the stainless steel coating at the inner wall near the front and rear ends of each inner stiffening rib steel 5 and then is welded and fixed to the two ends of each inner stiffening rib steel 5. The inner wall of the blanking section 4 is welded to the side of the plate body 6 facing the inner stiffening rib steel 5 by a transition welding rod; the inner wall of the blanking section 4 is welded and fixed to the stainless steel coating on the other side of the plate body 6, that is, the stainless steel coating is directly welded to the stainless steel coating. By scraping off the stainless steel coating at the blanking section 4 near the inner stiffening rib steel 5, direct welding and fixing with the inner stiffening rib steel 5 is achieved. At the same time, the inner wall of the blanking section 4 is welded to the same side of the plate body 6 by a transition welding rod, avoiding the problem of direct bimetallic welding of the stainless steel coating and carbon steel or low-alloy high-strength steel; and the blanking section 4 is directly welded to the stainless steel coating on the other side of the plate body 6, which ensures the welding strength, improves the stability and reliability of the structure as a whole, and simplifies the welding process.

[0068] Specifically, each inner stiffening rib steel 5 is an I-beam or an H-beam.

[0069] The webs of each I-beam or H-beam are parallel to the horizontal plane, the spacing between the two wing plates of each I-beam or H-beam is generally 200mm to 450mm, and the spacing between two vertically adjacent I-beams or H-beams is generally 600mm to 1000mm. This provides stable and uniform support for the plate body 6, effectively enhances the anti-deformation ability of the plate body 6, and ensures the stability and reliability of the plate body 6 under greater lateral pressure.

[0070] like Figure 2As shown, preferably, the outer side walls of the storage section 3 and the blanking section 4 are provided with a stiffening plate 7 in a ring shape at the relative position corresponding to each inner stiffening rib steel 5. By providing the stiffening plates 7 corresponding to each inner stiffening rib steel 5 on the outer wall of the silo body 1, the structural strength of the silo body 1 is significantly enhanced, and the overall stability and bearing capacity of the silo body 1 are improved.

[0071] like Figure 5 As shown, specifically, the annular stiffening plate 7 of the side wall of the storage section 3 is made of channel steel, and the positioning and spacing of the channel steel are consistent with the inner stiffening rib steel 5 of the compartment plate 2. The channel steel is bent according to the radius of the cylinder wall, the flange is parallel to the horizontal plane, and the opening faces the cylinder wall. The two flange plates are welded to the cylinder wall by single-sided fillet welds.

[0072] like Fig.13 As shown, specifically, the annular stiffening plate 7 of the side wall of the blanking section 4 is made of angle steel, and the positioning and spacing of the angle steel are consistent with the inner stiffening rib steel 5 of the compartment plate 2. The angle steel is bent according to the radius of the bucket wall, with the flange parallel to the horizontal plane and the opening facing downward. The flange and the bucket wall are welded by double-sided fillet welds, and ribs are set on the inner side of the angle steel at a circumferential spacing of 500 mm.

[0073] like Figures 8 to 10 As shown, the thickness of the lower side wall of the storage section 3 is greater than the thickness of the upper side wall of the storage section 3, so that the lower side wall of the storage section 3 forms a thickened plate 8, and the thickened plate 8 is made of 30mm thick steel plates rolled and spliced. The vertical weld adopts double-sided groove welding, the groove gap is 2mm, the bottom thickness is 4mm, and the angle is 60°. The inner surface of the thickened plate 8 is flush with the inner surface of the upper cylinder wall, and the connection between the outer surface of the thickened plate 8 and the outer surface of the upper cylinder wall is provided with a smoothly transitioned cut angle, specifically, the cut angle is 100mm high, and the blanking section 4 is welded and fixed. The thickened plate 8 significantly enhances the structural strength and durability of the lower part of the storage section 3, and by thickening the welding position between the bottom of the storage section 3 and the blanking section 4, the stress concentration of the welding part is reduced, and the structural stability and service life of the entire warehouse body 1 are further improved.

[0074] An annular bottom plate 10 is provided at the bottom of the thickened plate 8, and bolt holes 15 are reserved on the annular bottom plate 10 according to the arrangement of the coal hopper support beam (the entire coal hopper is provided with 8 supports, and each support is pre-embedded with 3x2 bolts). An annular horizontal stiffening plate 11 is provided on the outer wall of the thickened plate 8 corresponding to the position where the blanking section is connected. A rectangular vertical stiffening plate 12 is also provided on the outer wall of the thickened plate 8 between the annular bottom plate 10 and the annular horizontal stiffening plate 11, and a trapezoidal vertical stiffening plate 13 and a triangular anti-fall support plate 14 are provided at the corresponding position of the inner wall. By adding an annular bottom plate 10 at the bottom of the thickened plate 8 and reserving bolt holes to cooperate with the coal hopper support beam, and by providing multiple reinforcement plates on the inner and outer walls of the thickened plate 8, the structural integrity, load-bearing capacity and stability of the compartment coal hopper are comprehensively improved, effectively preventing the risk of structural deformation and material falling, and ensuring the safe and reliable operation of the compartment coal hopper.

[0075] The present invention also provides a welding method for a coal hopper having a divided storage bin, the steps of which are as follows:

[0076] S1, prefabricate the storage section 3 and the blanking section 4 of the bin body 1 respectively, and weld and fix the top of the blanking section 4 to the storage section 3;

[0077] Specifically, Figure 5 and Figure 6 As shown, the material of the side wall of the storage section 3 is carbon steel Q235 or low alloy high strength steel Q355, the plate thickness is generally 12mm, the steel plate is rolled into blocks and spliced ​​into a straight tube, the horizontal weld adopts single-sided groove welding, the groove gap is 0mm, the bottom thickness is 2mm, and the angle is 45°, the vertical weld adopts single-sided groove welding, the groove gap is 2mm, the bottom thickness is 2mm, and the angle is 60°.

[0078] like Fig.11 and Fig.12 The base material of the side wall of the blanking section 4 is carbon steel Q235 or low alloy high strength steel Q355, the thickness of the plate is generally 10mm to 12mm, and a stainless steel coating is also provided on the inner wall of the blanking section 4, the thickness of the stainless steel coating is generally 3mm. The stainless steel coating is provided on the inner wall of the blanking section 4 to significantly improve the wear resistance of the blanking section and extend the service life of the blanking section 4.

[0079] Specifically, the side wall of the blanking section 4 is made of stainless steel composite plates in blocks. The base material of the stainless steel composite plate is carbon steel Q235 or low alloy high strength steel Q355. The base plate thickness is generally 10mm to 12mm. The cladding material is stainless steel, and the cladding plate thickness is generally 3mm. After block rolling, double-sided groove welding is used to splice into a cone. The outer radius of the top of the blanking section is 2mm smaller than the inner radius of the storage section. Taking the base thickness of 12mm and the cladding thickness of 3mm as an example, the groove gap of the double-sided groove welding between the stainless steel composite plates is 1mm±1mm, the groove tip is on one side of the base, 3mm away from the interface between the base and the cladding, and the groove angles on both sides are 65°±5°. During welding, firstly, the base surface is welded with a welding material matching the base parent material to form a common weld 100, and the penetration of the common weld 100 is controlled at a position of 1.5mm to 2.5mm away from the interface between the base and the cladding. Then, a transition welding rod matching the cladding material is used to weld on the cladding side to form a transition weld 200. The top surface of the transition weld 200 is controlled to be 0.5mm to 1.5mm higher than the interface between the base and the cladding. Finally, a cladding welding rod is used to weld to form a cladding weld.

[0080] like Fig.14 As shown, after the prefabrication of the storage section 3 and the blanking section 4 is completed, the storage section 3 is first hoisted onto the coal hopper support beam and fixed, and then the blanking section 4 is hoisted to a predetermined height, and a transition electrode is used to weld the local area at the junction of the inner wall base and the covering layer of the blanking section 4 to form a transition weld 200, and then a welding rod matching carbon steel Q235 or low-alloy high-strength steel Q355 is used to weld the inner wall of the blanking section 4 and the inner wall of the storage section 3 to form a common weld 100, and the common weld 100 covers the extension line of the inner wall of the blanking section 4.

[0081] S2, respectively weld and fix the two ends of each inner stiffening rib steel 5 to the inner wall of the storage section 3 and the blanking section 4, and scrape off the stainless steel coating of the part to be welded of the blanking section 4 before welding;

[0082] Specifically, Fig.15 and Fig.16 As shown, the minimum net distance between the two ends of each inner stiffening rib steel 5 and the inner wall of the storage section 3 or the inner wall of the blanking section 4 at the corresponding position is 10 mm, and the two sides of the web of the inner stiffening rib steel 5 of each compartment plate 2 are welded to the inner wall of the storage section 3 or the inner wall of the blanking section 4 through a connecting angle steel 16 using welding rods matching carbon steel Q235 or low-alloy high-strength steel Q355 to form a common weld 100, the model of the connecting angle steel 16 is L100x12, and the length of the connecting angle steel 16 is 100 mm less than the height of the inner stiffening rib steel 5, and the common weld 100 is a three-sided fillet weld, and the weld leg size is the same as the thickness of the web of the inner stiffening rib steel 5.

[0083] Before welding the web of the inner stiffening rib steel 5 to the inner wall of the blanking section 4 through the connecting angle steel 16, the stainless steel coating on the inner wall of the blanking section 4 within the coverage of the connecting angle steel 16 is first peeled off or ground off, and the connecting angle steel 16 is welded to the base plate after exposing the base plate.

[0084] S3, welding and fixing one side of the carbon steel or low-alloy high-strength steel of each plate body 6 to the inner stiffening rib steel 5;

[0085] Specifically, Fig.17 and Fig.18 As shown, after the carbon steel or low-alloy high-strength steel side of each plate body 6 is respectively covered on both sides of the inner stiffening rib steel 5, the plate body 6 on one side is first welded and fixed to the inner stiffening rib steel 5 as a whole. Taking the welding of the left side plate body 6 as an example, the left side plate body 6 is first welded and assembled as a whole in advance. After the left side plate body 6 is welded, the other side plate body 6 is cut into grooves according to the spacing of the inner stiffening rib steel 5. The stainless steel coating is exposed at the bottom of the groove. Each groove seam is pressed tightly against the center of the flange of each stiffening rib steel. The groove gap is 5mm, the bottom thickness is 2mm, and the angle is 65°±5°. Then, a welding rod matching carbon steel Q235 or low alloy high strength steel Q355 is used to weld the base plate of the plate body 6 and the inner stiffening rib steel 5 to form a common weld 100, and then a transition welding rod matching the stainless steel coating is used to weld the transition weld 200. The top surface of the transition weld 200 is controlled to be 0.5mm to 1.5mm higher than the interface between the base and the coating. Finally, a stainless steel coating welding rod is used to weld the stainless steel weld 300.

[0086] S4, the inner wall of the storage section 3 is welded to the side of the plate body 6 facing the inner stiffening rib steel 5, and the inner wall of the storage section 3 is welded to the stainless steel coating on the other side of the plate body 6 by a transition welding rod;

[0087] Specifically, Fig.19 As shown, grooves are firstly made at both ends of the plate body 6, the gap between the groove and the inner wall of the storage section 3 is 2mm, the groove bottom thickness is 2mm, and the angle is 45°±5°. During welding, the base plate of the plate body 6 and the inner wall of the storage section 3 are firstly welded with welding rods matching carbon steel Q235 or low alloy high strength steel Q355 to form a common weld 100, the top surface of the common weld 100 is controlled at a position of 1.5mm to 2.5mm away from the interface, and then the transition weld 200 is welded with a transition welding rod matching the stainless steel cladding, and the top surface of the transition weld 200 is flush with the outer surface of the stainless steel cladding.

[0088] S5. The inner wall of the blanking section 4 and the side of the plate body 6 facing the inner stiffening rib steel 5 are welded by a transition welding rod, and the inner wall of the blanking section 4 and the stainless steel cladding on the other side of the plate body 6 are welded and fixed.

[0089] Specifically, Fig. 20As shown, in step S5, grooves are firstly made at both ends of the plate body 6, the gap between the groove and the inner wall of the storage section 3 is 2 mm, and the groove bottom thickness is 10 mm. During welding, the inner side of the base plate of the plate body 6 is not welded, and a transition welding rod matching the stainless steel coating is first used to weld the transition weld 200, and the top surface of the transition weld 200 is controlled to be 0.5 mm to 1.5 mm higher than the interface, and finally the stainless steel coating welding rod is used to weld the stainless steel weld 300.

[0090] After the silo body 1 and the compartment plate 2 are welded, the coal hopper top cover is finally welded to close it. The top cover adopts the existing technology and will not be described here.

[0091] When choosing welding rods that match carbon steel Q235 or low alloy high strength steel Q355, for Q235 steel, E4303 welding rods are generally selected; for Q355 steel, E5015 and E5016 welding rods are recommended; and when Q235 and Q355 steel need to be welded together, E50 series welding rods can be considered for welding. When choosing welding rods, the performance of the parent material, welding conditions and quality requirements of the welded joint need to be considered.

[0092] When selecting transition electrodes, for welding carbon steel Q235 or low alloy high strength steel Q355 with stainless steel cladding, you can choose transition electrodes such as 316L stainless steel electrodes, E7018 electrodes, nickel-based alloy electrodes or dissimilar steel electrodes. When selecting electrodes, you need to consider the performance of the parent material, welding conditions and quality requirements of the welded joint.

[0093] When choosing stainless steel cladding electrodes, for austenitic stainless steel, usually choose austenitic stainless steel electrodes, such as A102, A132, etc.; for martensitic stainless steel, you can choose martensitic stainless steel electrodes, such as G202, G207, etc., but you need to pay attention to preheating before welding and tempering after welding; for ferritic stainless steel, you can choose ferritic stainless steel electrodes, such as G302, G307. When choosing electrodes, you should choose the appropriate welding material according to factors such as the composition of the base material, welding conditions and use environment.

[0094] In summary, the coal bunker and welding method thereof provided in the embodiment of the present invention are as follows: the inner wall of the storage section is welded to the two ends of each inner stiffening rib steel, the inner wall of the storage section is welded to the side of the plate body facing the inner stiffening rib steel, and the inner wall of the storage section is welded to the stainless steel coating of the plate body by a transition welding rod;

[0095] A stainless steel coating is provided on the inner wall of the blanking section, and the stainless steel coating is scraped off the inner wall of the blanking section close to the front and rear ends of each inner stiffening rib steel to be welded and fixed to the two ends of each inner stiffening rib steel;

[0096] The inner wall of the blanking section is welded to one side of the plate body facing the inner stiffening rib steel by a transition welding rod, and the inner wall of the blanking section is welded and fixed to the stainless steel covering on the other side of the plate body.

[0097] It allows direct welding of parts of different components of the coal hopper with the same material. For welding between parts of different materials, the stainless steel coating is scraped off or transition electrodes are used for welding. This avoids the problem of electrochemical corrosion caused by direct welding of different metal materials in the traditional coal hopper with compartments, which leads to a decrease in the strength of the welding parts. It ensures the strength and durability of the welded joints, effectively extends the service life of the coal hopper with compartments, and significantly reduces the safety hazards caused by failure of welding connections due to bimetallic corrosion.

[0098] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A coal hopper with compartments, comprising a silo (1) and a compartment plate (2), wherein the silo (1) comprises a storage section (3) and a material-discharging section (4) connected to each other vertically, and the compartment plate (2) is vertically arranged in the silo (1) and extends from the storage section (3) to the bottom of the material-discharging section (4), wherein: The compartment plate (2) comprises a plurality of internal stiffening rib steels (5) arranged in vertical rows and spaced apart from each other, and a plate body (6) welded to the left and right sides of the internal stiffening rib steels (5), and the webs of the internal stiffening rib steels (5) are all placed horizontally; The material of each of the inner stiffening rib steels (5) is carbon steel or low-alloy high-strength steel, the material of the side of each of the plates (6) facing the inner stiffening rib steel (5) is carbon steel or low-alloy high-strength steel, and the other side of each of the plates (6) is provided with a stainless steel coating; The inner wall of the storage section (3) is welded and fixed to both ends of each of the inner stiffening rib steels (5), the inner wall of the storage section (3) is welded to the side of the plate body (6) facing the inner stiffening rib steels (5), and the inner wall of the storage section (3) is welded and fixed to the stainless steel coating of the plate body (6) by a transition welding rod; The inner wall of the blanking section (4) is provided with a stainless steel coating, and the stainless steel coating at the inner wall of the blanking section (4) close to the front and rear ends of each inner stiffening rib steel (5) is scraped off to be welded and fixed to the two ends of each inner stiffening rib steel (5); The inner wall of the blanking section (4) is welded to the side of the plate body (6) facing the inner stiffening rib steel (5) by a transition welding rod, and the inner wall of the blanking section (4) is welded and fixed to the stainless steel coating on the other side of the plate body (6).

2. A coal hopper according to claim 1, characterized in that: The material of the side wall of the blanking section (4) is a stainless steel composite plate; the material of the plate body (6) is a stainless steel composite plate; Each of the stainless steel composite plates is made of a base layer and a cladding layer by a direct rolling method. The base layer is made of carbon steel or low-alloy high-strength steel, and the cladding layer is made of stainless steel.

3. A coal hopper according to claim 1 or 2, characterized in that: Each of the inner stiffening rib steels (5) is an I-beam or an H-beam.

4. A coal hopper according to claim 1 or 2, characterized in that: Stiffening plates (7) are provided in a ring shape on the outer sides of the side walls of the storage section (3) and the blanking section (4) corresponding to the relative positions of the internal stiffening rib steels (5).

5. A coal hopper according to claim 1 or 2, characterized in that: The thickness of the lower side wall of the storage section (3) is greater than the thickness of the upper side wall of the storage section (3), so that the lower side wall of the storage section (3) forms a thickened plate (8), the inner surface of the thickened plate (8) is flush with the inner surface of the upper cylinder wall, and the blanking section (4) is welded and fixed to the thickened plate (8).

6. The welding method of the coal hopper according to any one of claims 1 to 5, characterized in that: S1, prefabricating the storage section (3) and the blanking section (4) of the bin body (1) respectively, and welding and fixing the top end of the blanking section (4) to the storage section (3); S2, respectively welding and fixing the two ends of each inner stiffening rib steel (5) to the inner wall of the storage section (3) and the blanking section (4), and scraping off the stainless steel coating of the to-be-welded portion of the blanking section (4) before welding; S3, welding and fixing one side of the carbon steel or low-alloy high-strength steel of each plate body (6) to the inner stiffening rib steel (5); S4, the inner wall of the storage section (3) is welded to the side of the plate body (6) facing the inner stiffening rib steel (5), and the inner wall of the storage section (3) is welded to the stainless steel coating on the other side of the plate body (6) by a transition welding rod; S5. The inner wall of the blanking section (4) is welded to the side of the plate body (6) facing the inner stiffening rib steel (5) by a transition welding rod, and the inner wall of the blanking section (4) is welded and fixed to the stainless steel coating on the other side of the plate body (6).

7. The welding method according to claim 6, characterized in that: In step S1, the storage section (3) and the blanking section (4) of the bin body (1) are prefabricated respectively, and the top end of the blanking section (4) is welded and fixed to the storage section (3) as follows; A transition welding rod is used to weld the stainless steel coating on the inner wall of the blanking section (4) to form a transition welding seam (200) after welding, and a welding rod matching carbon steel or low-alloy high-strength steel is used to weld the inner wall of the blanking section (4) and the inner wall of the storage section (3) to form a common welding seam (100).

8. The welding method according to claim 6, characterized in that: In step S3, the carbon steel or low alloy high strength steel side of each plate body (6) is welded and fixed to the inner stiffening rib steel (5) in the following manner: The carbon steel or low-alloy high-strength steel side of each plate body (6) is respectively covered on both sides of the inner stiffening rib steel (5), and then the plate body (6) on one side of the stiffening rib steel is welded, and then the plate body (6) on the other side is cut into grooves according to the spacing of each inner stiffening rib steel (5), and the grooves expose the stainless steel coating. The inner wall of the blanking section (4) and the inner wall of the storage section (3) are welded using welding rods matching the carbon steel or low-alloy high-strength steel to form a common weld (100), the transition welding rod matching the stainless steel coating is used to weld the transition weld (200), and the stainless steel coating welding rod is used to weld the stainless steel weld (300).

9. The welding method according to claim 6, characterized in that: In step S4, the inner wall of the storage section (3) is welded to the side of the plate body (6) facing the inner stiffening rib steel (5), and the inner wall of the storage section (3) is welded to the stainless steel coating on the other side of the plate body (6) by a transition welding rod. Specifically, the following steps are performed: A common weld (100) is welded using a welding rod matching carbon steel or low alloy high strength steel, and a transition weld (200) is welded using a transition welding rod matching a stainless steel cladding, wherein the top surface of the transition weld (200) is flush with the outer surface of the stainless steel cladding.

10. The welding method according to claim 6, characterized in that: In step S5, the inner wall of the blanking section (4) is welded to the side of the plate body (6) facing the inner stiffening rib steel (5) by a transition welding rod, and the inner wall of the storage section (3) is welded to the stainless steel coating on the other side of the plate body (6) by welding and fixing. Specifically, A transition welding rod matching the stainless steel coating is used to weld a transition weld (200), and a stainless steel coating welding rod is used to weld a stainless steel weld (300).

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