Cloth chute

Abstract

The present application belongs to the technical field of blast furnace smelting equipment, and specifically provides a material distribution chute, which comprises a shell, a plurality of rib plates arranged along the depth direction of the material distribution chute are fixed on the inner wall of the shell, and a plurality of alloy tool bits are fixed at the top end of each rib plate; a smooth lining base body is fixed between the rib plates, a wear-resistant layer is fixed above the smooth lining base body, and the height difference between the wear-resistant layer and the top end of the alloy tool bit ranges from 3mm to 10mm. The smooth lining base body is fixedly connected with the shell through welding. The alloy tool bit is embeddedly installed at the top end of the rib plate, and the top end of the alloy tool bit is flush with the top end of the rib plate. The present application has the advantages of simple structure, alloy tool bits arranged on the rib plates, cooperation with the wear-resistant layer structure, greatly improved wear resistance and impact strength of the whole chute, effectively prolonged service life of the material distribution chute, and suitability for blast furnace smelting technology.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of blast furnace smelting equipment, in particular to a material distribution chute. BACKGROUND

[0002] The material distribution chute is the core equipment of the blast furnace ironmaking furnace top material distribution system, which uniformly and accurately distributes the furnace materials (sintered ore, pellet, lump ore, coke, etc.) to the blast furnace throat material surface according to the set mode. The material distribution chute is usually a long strip-shaped tank with a U-shaped or V-shaped or semicircular cross section. During use, the driving device controls the inclination angle and rotation number of the chute to make the furnace materials smoothly slide along the tank.

[0003] Due to the characteristics of high temperature, high pressure, high dust, and furnace material impact in the ironmaking furnace, the material distribution chute is prone to wear and tear during operation and needs to be replaced after a period of use. In the authorized announcement No. CN218026180 U of the Chinese utility model patent, a high-temperature-resistant material distribution chute is disclosed, which comprises a material distribution chute tank body, a lining plate, and a pressing plate. The material distribution chute tank body, the lining plate, and the pressing plate are detachably connected together through a plurality of mounting bolts to realize the replacement of the damaged lining plate and pressing plate. Although this method of replacing part of the structure instead of the whole chute structure can save production costs to some extent, it still has some problems. The bolt connection structure is prone to breakage under high-speed impact of the furnace materials, resulting in failure of the chute. Even if the damaged lining plate or pressing plate can be detached and replaced, this structure does not improve the wear resistance and impact resistance of the chute itself, resulting in frequent replacement of certain parts and affecting production efficiency. SUMMARY

[0004] To solve the above problems in the prior art, the present application aims to provide a material distribution chute which improves the overall wear resistance and impact resistance by setting alloy tool bits and wear-resistant layers to solve the problem of short service life of the material distribution chute in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a material distribution chute, comprising an outer shell, a plurality of rib plates are fixedly arranged on the inner wall of the outer shell along the depth direction of the material distribution chute, and a plurality of alloy tool bits are fixedly arranged on the top end of each rib plate along the length direction of the rib plate; a smooth lining plate base body is fixedly arranged between the rib plates, and a wear-resistant layer is fixedly arranged above the smooth lining plate base body; the height difference between the wear-resistant layer and the top end of the alloy tool bit is in the range of 3mm-10mm.

[0006] As a limitation: the cross section of the alloy tool bit is T-shaped structure, a groove is formed on the top end of the rib plate, and the alloy tool bit is embeddedly installed in the groove, and the top end of the alloy tool bit is flush with the top end of the rib plate.

[0007] As a limitation: the rib plate is fixed with a layer of wear-resistant steel plate on the top end, which can cover or coat the alloy cutter head on the top end.

[0008] As a limitation: the rib plate is inclinedly arranged on the inner wall of the shell, the inclined direction of the rib plate is towards the direction of the furnace charge inlet, and the included angle between the rib plate and the inner wall of the shell is in the range of 40°-75°.

[0009] As a limitation: the interval distance between the alloy cutter heads on the rib plate is 1-5mm.

[0010] As a limitation: a plurality of fixing columns for supporting and fixing the smooth lining plate base body are further fixed on the inner wall of the shell, and a plurality of welding ports corresponding to the fixing columns are further arranged on the smooth lining plate base body, which are matched with the fixing columns and used for welding assembly with the fixing columns.

[0011] As a further limitation: the wear-resistant layer is covered on the smooth lining plate base body by means of surfacing, and the thickness of the wear-resistant layer is 8mm.

[0012] As a further limitation: the smooth lining plate base body is made of high-hardness alloy steel material, and the thickness of the smooth lining plate base body is 16mm.

[0013] As a further limitation: the height of the rib plate is 75mm, the thickness of the rib plate is 35mm, and the interval between the rib plates is 200mm.

[0014] As a further limitation: the material distribution chute further comprises a baffle, the baffle comprises a left baffle and a right baffle, the left baffle and the right baffle are fixed on the left end and the right end of the side wall of the shell in the vertical direction, and a plurality of alloy cutter heads are fixed on the side of the left baffle and the right baffle, which faces the inner wall of the shell.

[0015] Compared with the prior art, the beneficial effects achieved by the present application are:

[0016] The rib plates provided by the present application are perpendicular to the direction of the flow of the furnace charge, and can disperse the impact force caused by the falling of the furnace charge, and the rib plate structure also increases the rigidity of the whole chute; an alloy cutter head is arranged at the top end of the rib plate, the alloy cutter head is made of a material with extremely high hardness and excellent wear resistance, and can directly resist the severe impact and friction wear caused by the furnace charge to the rib plate; in order to further improve the wear resistance and impact resistance of the rib plate, a wear-resistant steel plate is arranged above the alloy cutter head, and the wear-resistant steel plate is worn out and then the alloy cutter head is worn out. The fixing mode between the alloy cutter head and the rib plate is an embedded structure, so that the alloy cutter head is not easy to fall off, and the service life of the alloy cutter head is prolonged. The wear-resistant layer in the present application is arranged on the smooth lining plate base between the rib plates, which can improve the overall wear resistance of the chute, and the distance between the wear-resistant layer and the top end of the alloy cutter head is much smaller than that in the prior art, which can reduce the high crushing rate caused by impact during the distribution of the furnace charge, protect the structure of the furnace charge, and combine the inclined arrangement mode of the rib plate to ensure that the furnace charge can smoothly enter the outlet of the chute. The structure of the alloy cutter head, the rib plate and the wear-resistant layer in the present application is mutual, and can simultaneously realize the purposes of dispersing impact force and improving wear resistance. In addition, the parts are fixed by welding, and the structure is simple and durable. In actual production, the wear resistance and impact resistance of the present application are good, the service life of the distribution chute can be increased from about 4-8 months to about 12-18 months, and the present application has significant economic and social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an axial cross-sectional view of the embodiment of the present application.

[0018] Figure 2 It is a top view of the embodiment of the present application.

[0019] Figure 3 It is an enlarged view of A in the embodiment of the present application. Figure 1

[0020] In the figure: 1-outer shell, 2-wear-resistant layer, 3-rib plate, 4-alloy cutter head, 5-smooth lining plate base, 6-fixing column, 7-left baffle, 8-right baffle, 9-wear-resistant steel plate. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and do not constitute a limitation on the present application. EMBODIMENT

[0022] As Figures 1 to 3 ​As shown in the figure, it is a material chute, the material chute is generally a long strip-shaped groove, the cross section is U-shaped or V-shaped, through the continuous rotation, the inclination, the furnace charge falling into one end of the groove can smoothly slide from the other end of the groove. The material chute of the present application comprises a shell 1, a plurality of rib plates 3 are fixed on the inner wall of the shell 1 along the depth direction of the material chute, that is, a plurality of rib plates 3 are arranged in parallel at a certain distance in the axial direction of the groove, the rib plate 3 is an arc shape adhering to the inner wall of the shell 1, a plurality of alloy tool bits 4 are fixed at the top end of each rib plate 3. A smooth lining plate base body 5 is fixed between the rib plate 3 and the rib plate 3, and a wear-resistant layer 2 is fixed above the smooth lining plate base body 5.

[0023] As shown in Figure 1 , Figure 2 As shown in the figure, the rib plate 3 is welded on the inner wall of the shell 1, the rib plate 3 can disperse the impact force caused by the falling of the furnace charge and can increase the rigidity of the whole chute. In the embodiment, the rib plate 3 is inclinedly arranged on the inner wall of the shell, the rib plate 3 is inclined towards the direction of the furnace charge inlet (the arrow in the figure shows the direction of the furnace charge flow), and the included angle formed between the rib plate 3 and the inner wall of the shell ranges from 40° to 75°, and the included angle in the embodiment is 50°. Specifically, the specification and the number of the rib plate are set according to the actual needs, in the embodiment, the height of the rib plate 3 is 75mm, the thickness is 35mm, and the interval between the rib plate 3 and the rib plate 3 is 200mm.

[0024] The smooth lining base body 5 fixed between the rib plates 3 is fixedly connected with the rib plates 3 and the shell 1 by welding. The smooth lining base body 5 is an arc-shaped plate, and the bending radius of the cross section of the smooth lining base body 5 is the same as the radius of the shell 1. The edges of the arc-shaped plate are respectively fixedly connected with the inner walls of the rib plates 3 and the shell 1 located on both sides of the edges. Since the rib plates 3 need to have a certain height to increase the rigidity of the rib plates 3 and the chute as a whole, and the thickness of the smooth lining base body 5 is limited (generally 10mm-20mm), in order to realize a small height difference between the wear-resistant layer 2 and the top end of the alloy cutter head 4 fixed above the smooth lining base body 5, the installation height of the smooth lining base body 5 is raised to reduce the distance between the surface of the smooth lining base body 5 and the top end of the rib plate 3 in the embodiment. Therefore, there is a gap between the lower surface of the smooth lining base body 5 and the inner wall of the shell 1. In order to better fix the position of the smooth lining base body 5 and make it solid and durable, a plurality of fixed columns 6 for supporting and fixing the smooth lining base body 5 are further fixed on the inner wall of the shell 1. The fixed columns 6 are in the shape of a cylinder, and corresponding welding interfaces for welding assembly with the fixed columns 6 are formed on the smooth lining base body 5. The smooth lining base body 5 is welded with the fixed columns 6 through the welding interfaces when the smooth lining base body 5 is installed. In the embodiment, one fixed column 6 is arranged between two adjacent rib plates 3, and two or three fixed columns 6 can also be arranged according to actual needs. The smooth lining base body 5 is made of high-hardness alloy steel 42CrMo, and the thickness of the smooth lining base body 5 is preferably 16mm.

[0025] The alloy cutter head 4 is fixedly arranged at the top end of the rib plate 3. A plurality of alloy cutter heads 4 are arranged at the top end of each rib plate 3 along the length direction of the rib plate 3, and the length direction of the rib plate 3 refers to the arc circumferential direction of the rib plate 3. The alloy cutter head 4 is fixed by mechanical embedding, specifically, the alloy cutter head 4 is embeddedly installed at the top end of the rib plate 3. A groove matching the shape of the alloy cutter head 4 is formed at the top end of the rib plate 3, and the alloy cutter head is embeddedly installed in the groove, so that the top end of the alloy cutter head 4 is flush with the top end of the rib plate 3. Figure 3As shown, in the embodiment, the alloy head 4 is T-shaped in cross section, and is embedded in the groove of the rib plate 3. During embedding, the rib plate 3 and the alloy head 4 are fixed by cold and hot assembly interference fit. In order to make the embedding of the alloy head 4 more firm, the lower end of the alloy head 4 can be dovetail-shaped. Specifically, the rib plate 3 is heated to expand and the groove is enlarged, and the alloy head 4 is placed after being cooled. When the part reaches room temperature, interference fit is formed. The spacing distance between the alloy heads 4 on one rib plate 3 is 1-5 cm, and the spacing distance on all rib plates 3 can be selected to be the same. In the embodiment, the spacing distance of the alloy heads 4 on each rib plate 3 is 1 cm. At the same time, since the impact force of the furnace charge on the chute gradually decreases from the inlet end (opposite the falling point of the furnace charge) to the outlet end, different distribution spacing of the alloy heads 4 can be selected on different rib plates 3. Specifically, the number of alloy heads 4 arranged on the rib plate 3 at the inlet end of the furnace charge of the chute is greater than the number of alloy heads 4 arranged on the rib plate 3 at the middle and outlet end of the chute. This can effectively improve the impact resistance of the chute while greatly reducing the use cost of the alloy head 4.

[0026] The alloy head 4 is made of a material with extremely high hardness and excellent wear resistance, preferably tungsten carbide (WC) hard alloy, which can directly resist the severe impact and friction wear of the furnace charge on the rib plate 3. In order to protect the alloy head 4, a wear-resistant steel plate 9 is arranged on the top end of the rib plate 3 to cover or coat the upper end of the alloy head. The wear-resistant steel plate 9 is preferably made of high-manganese austenitic steel material that can withstand high impact and high stress, and the thickness is preferably about 3 mm. The wear-resistant steel plate 9 is fixed on the top end of the rib plate 3 by welding, so that the wear-resistant steel plate 9 covers or coats the upper end of the alloy head. The welding fixing method can ensure that the wear-resistant steel plate 9 is not easily detached during use. In the initial stage of use, the furnace charge is in direct contact with the wear-resistant steel plate 9. After 15-20 days of use, the wear-resistant steel plate 9 is worn out, and then the furnace charge is in contact with the alloy head 4. In this way, by adding the wear-resistant steel plate 9 to the alloy head 4, the service life of the entire chute can be further improved.

[0027] The wear-resistant layer 2 is fixed on the smooth backing base 5, specifically, the wear-resistant layer 2 is welded on the smooth backing base 5 by a surfacing process, the wear-resistant layer 2 can adopt any one of YD801 wear-resistant layer, Stellite 6 wear-resistant layer or other wear-resistant layers with similar wear-resistant properties, such wear-resistant layer is a high-hardness wear-resistant composite layer formed by a flux-cored wire surfacing technology, has high wear resistance and is suitable for parts subjected to high wear and moderate impact. In the embodiment, the YD801 wear-resistant layer is selected, and the thickness of the wear-resistant layer 2 is preferably 8 mm. The distance between the wear-resistant layer 2 and the top end of the alloy blade 4 is much smaller than the distance between the wear-resistant layer 2 and the top end of the blade in the prior art, which can reduce the high breakage rate caused by impact during the charging process, protect the burden structure and ensure that the burden can smoothly enter the chute outlet. Specifically, the height difference between the wear-resistant layer 2 and the top end of the alloy blade 4 is in the range of 3 mm to 10 mm, and in the embodiment, it is preferably 5 mm.

[0028] As shown in Figure 2 The feeding chute of the embodiment further includes left and right baffles 7 and 8 which can effectively prevent the burden from spilling out from both sides of the chute body, and the left and right baffles 7 and 8 are fixed on the left and right ends of the side wall of the shell in the vertical direction. The baffle near the shell is easily damaged by the high impact force of the burden, so a plurality of baffle alloy blades (not shown in the figure) are fixed on the side of the baffle facing the inner wall of the shell 1 for enhancing the wear resistance of the baffle. The distribution and number of the baffle alloy blades can be selected according to the actual application.

[0029] The production and manufacturing process of the present application is as follows: the alloy blade 4 is fixed on the rib plate 3 preform by cold and hot assembly interference fit, and a 3 mm thick high manganese steel wear-resistant steel plate 9 is welded and fixed above the rib plate 3. The rib plate 3 with the fixed alloy blade 4 is welded and fixed on the inner wall of the shell 1; the smooth backing base 5 is installed and laid between the rib plates 3, so that the welding joints on the smooth backing base 5 correspond to the fixed columns 6 fixed on the shell 1, and the two are welded and fixed, and the smooth backing base 5 is also fixed between the rib plate 3 and the shell by welding. Finally, the YD801 wear-resistant layer is surfacing welded on the smooth backing base 5 to form the wear-resistant layer 2, and the height difference between the wear-resistant layer 2 and the top end of the alloy blade 4 is 5 mm.

[0030] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A fabric chute, comprising a housing, characterized in that: The inner wall of the outer shell is fixed with several ribs arranged along the depth direction of the fabric chute, and each rib is fixed with several alloy cutter heads distributed along the length direction of the rib. A smooth liner substrate is fixed between the ribs, and a wear-resistant layer is fixed on the top of the smooth liner substrate. The height difference between the wear-resistant layer and the top of the alloy cutter head is 3mm to 10mm. The smooth liner substrate is fixedly connected to the ribs and the outer shell by welding. There is a certain gap between the lower surface of the smooth liner substrate and the outer shell. Several fixing posts for supporting and fixing the smooth liner substrate are also fixed on the inner wall of the outer shell. Correspondingly, a welding port matching the fixing post is opened on the smooth liner substrate for welding and assembly with the fixing post. The alloy cutter head has a T-shaped cross-section with a groove at the top of the rib plate. The alloy cutter head is embedded in the groove, and the top of the alloy cutter head is flush with the top of the rib plate. A wear-resistant steel plate that can cover or enclose the upper part of the alloy cutter head is fixed to the top of the rib plate. The rib plate is inclined on the inner wall of the shell, with the inclined direction of the rib plate facing the furnace charge inlet. The included angle between the rib plate and the inner wall of the shell is 40° to 75°. The spacing between the alloy cutter heads on the rib plate is 1 cm to 5 cm. It also includes a baffle, which includes a left baffle and a right baffle. The left baffle and the right baffle are fixed vertically at the left and right ends of the side wall of the shell. Several alloy cutter heads are fixed on the side of the left baffle and the right baffle facing the inner wall of the shell.

2. The fabric chute according to claim 1, characterized in that: The wear-resistant layer is applied to the smooth liner substrate by overlay welding, and the thickness of the wear-resistant layer is 8mm.

3. A fabric chute according to claim 2, characterized in that: The smooth liner substrate is made of high-hardness alloy steel and has a thickness of 16mm.

4. A fabric chute according to claim 3, characterized in that: The ribs are 75mm high and 35mm thick, and the spacing between the ribs is 200mm.

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