Chute structure for pellets

Abstract

The utility model relates to a chute structure for pellets, which belongs to the technical field of pellet conveying equipment, and comprises an upper chute and a lower chute, the upper chute comprises a steel structure frame, the top of the steel structure frame is provided with a masonry groove, at least two U-shaped mounting frames are fixedly welded in the masonry groove, and the lower chute is provided with an upper chute and a lower chute. Replaceable first abrasive bricks are arranged in the U-shaped grooves of the mounting frames, second abrasive bricks are built between the adjacent mounting frames and between the mounting frames and the inner walls of the upper and lower building grooves, and the top edge of each first abrasive brick is higher than the bottom edge of the second abrasive brick above and forms a material blocking step table. At least two material blocking step tables are formed on the material guiding plane of the upper chute. In the using process, pellets are stacked on the material blocking step table, a pellet material layer is formed on the surfaces of the material blocking step table and the second abrasive bricks above the material blocking step table, the high-temperature pellets falling from a chain grate directly fall on the stacked pellets, the state that the pellets hit the pellets is formed through design, and the buffering protection effect on the refractory working layer of the upper chute is achieved.

Description

Technical Field

[0001] The utility model relates to a pellet chute structure, belonging to the technical field of pellet conveying equipment. Background Art

[0002] Pelletized ore is a mixture of concentrate powder, flux, binder and fuel, which is rolled into raw balls with a diameter of 8 to 16 mm in a pelletizing machine, and then dried, roasted and consolidated into an excellent iron-containing raw material with good metallurgical properties to meet the needs of steel smelting.

[0003] When the pellets are sintered in the chain grate and run to the rotary kiln, the inclined chute used at the connection is currently generally built with ordinary high-alumina bricks according to the smooth slope, with a masonry angle of about 45°. After the pellets are lightly burned in the chain grate, the balls have high strength, and the balls fall with a drop of 1.5 to 2 meters, which has a large impact force. The landing point of the balls is relatively fixed, and the annual ball passing volume is about 1.5 million tons to 1.8 million tons. The temperature of the use environment changes greatly, causing local rapid damage to the inclined chute, and the kiln is often shut down for maintenance after 6-8 months of use. This has an adverse impact on continuous production. Utility Model Content

[0004] The utility model provides a pelletizing chute structure to solve the problems in the above-mentioned background technology.

[0005] The utility model relates to a chute structure for pelletizing, comprising an upper chute and a lower chute extending into a rotary kiln, the upper chute comprising an inclined steel structure frame, the top of the steel structure frame is provided with an inclined masonry groove, no less than two U-shaped mounting frames are welded and fixed in the masonry groove, a replaceable wear-resistant brick is arranged in the U-shaped groove of the mounting frame, a fixing bolt passing through the mounting frame to fix the wear-resistant brick is arranged at the bottom of the steel structure frame, wear-resistant bricks are laid between adjacent mounting frames and between the mounting frames and the upper and lower inner walls of the masonry groove, the tops of a plurality of wear-resistant bricks are on the same inclined plane, the bottom edge of each wear-resistant brick is flush with the top edge of the lower wear-resistant brick, the top edge of each wear-resistant brick is higher than the bottom edge of the upper wear-resistant brick and forms a material-blocking step, and the lower chute is in an arc shape.

[0006] As a preferred embodiment, a buffer boss is provided on the inner side wall of the bottom of the lower chute near one end of the upper chute, and the buffer boss is flush with the bottom of the lowermost wear-resistant brick 2. A layer of pellet material is also accumulated at the buffer boss to prevent the pellets from being fixed and hitting the lower chute.

[0007] As a preferred embodiment, material retaining edges are provided at the front and rear of the upper chute.

[0008] As a preferred embodiment, the upper chute includes an arc-shaped supporting steel frame fixed to the steel structure frame, and a wear-resistant castable layer covering the supporting steel frame is cast on the outer side thereof, so that the structure is more stable.

[0009] As a preferred embodiment, a positioning column is fixed to one end of the supporting steel frame close to the steel structure frame, and a positioning groove cooperating with the positioning column is provided on the steel structure frame. The supporting steel frame is welded and fixed to the steel structure frame to facilitate the positioning and installation of the steel structure frame.

[0010] As a preferred embodiment, the rotary kiln is provided with a reducing opening near one end of the lower chute, and a gap is provided between the bottom of the lower chute and the inner wall of the reducing opening to better prevent material leakage.

[0011] The utility model has the following beneficial effects:

[0012] No less than two material-blocking steps are formed on the material-blocking step plane of the upper chute. During use, the pellets are accumulated on the material-blocking step, and a layer of pellet material is formed on the material-blocking step and the surface of the wear-resistant bricks above. The high-temperature pellets dropped from the chain grate directly fall on the accumulated pellets, and the design forms a ball-hitting state, which plays a buffering and protective role on the refractory working layer of the upper chute, thereby reducing the damage rate of the refractory of the upper chute. The wear-resistant bricks forming the material-blocking step can be easily disassembled and replaced, saving maintenance time and reducing maintenance costs. In addition, the lower chute is arc-shaped, so that the discharging direction is always toward the axial direction of the rotary kiln, which better prevents the pellets entering the rotary kiln from falling between the bottom of the lower chute and the inner wall of the rotary kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the side structure of the lower chute;

[0015] In the figure: 1. Rotary kiln; 2. Reduced diameter and shrinkage; 3. Lower chute; 4. Wear-resistant brick 2; 5. Material blocking step; 6. Positioning column; 7. Steel structure frame; 8. Masonry groove; 9. Fixing bolt; 10. Installation frame; 11. Wear-resistant brick 1; 12. Support steel frame; 13. Chain grate; 14. Material blocking edge; 15. Buffer boss. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with embodiments.

[0017] Embodiment 1, as Figure 1 to Figure 2As shown, the utility model is a chute structure for pelletizing, comprising an upper chute and a lower chute 3 extending into a rotary kiln 1, the upper chute comprising an inclined steel structure frame 7, the top of the steel structure frame 7 is provided with an inclined masonry groove 8, at least two U-shaped mounting frames 10 are welded and fixed in the masonry groove 8, a replaceable wear-resistant brick 11 is provided in the U-shaped groove of the mounting frame 10, a fixing bolt 9 is provided at the bottom of the steel structure frame 7 for passing through the mounting frame 10 to fix the wear-resistant brick 11, wear-resistant bricks 2 4 are masonried between adjacent mounting frames 10 and between the mounting frames 10 and the inner walls of the upper and lower masonry grooves 8, the wear-resistant bricks 11 are provided with threads matching with the fixing bolts 9, the tops of the plurality of wear-resistant bricks 2 4 are on the same inclined plane, the bottom edge of each wear-resistant brick 11 is flush with the top edge of the lower wear-resistant brick 2 4, the top edge of each wear-resistant brick 11 is higher than the bottom edge of the upper wear-resistant brick 2 4 and forms a material-blocking step 5, and the lower chute 3 is arc-shaped.

[0018] During the construction of the upper chute, the mounting frame 10 is welded and fixed at the corresponding position of the masonry groove 8, and then the wear-resistant brick 11 is fixed to the mounting frame 10 by the fixing bolts 9, and then the wear-resistant brick 2 4 is built in the masonry groove 8. During operation, the high-temperature pellets transported by the chain grate 13 will fall on the wear-resistant brick 11 at the upper part of the upper chute, and then when passing through the material blocking step 5, the pellets will accumulate on the material blocking step 5, and a layer of pellet material will be formed on the surface of the material blocking step 5 and the wear-resistant brick 2 4 above. The subsequent high-temperature pellets falling from the chain grate 13 will directly fall on the accumulated pellets, and the design will form a ball-playing state, which will play a buffering and protective role on the refractory working layer of the upper chute, thereby reducing the damage rate of the refractory of the upper chute, and the pellets falling from the upper chute will roll onto the lower chute 3, and then enter the rotary kiln 1 from the port of the lower chute 3. When the wear-resistant brick 11 needs to be replaced, the fixing bolt 9 can be unscrewed, and the wear-resistant brick 11 can be removed and replaced.

[0019] Embodiment 2, based on embodiment 1, a buffer boss 15 is provided on the inner side wall of the bottom of the lower chute 3 near one end of the upper chute, and the buffer boss 15 is flush with the bottom of the lowest wear-resistant brick 2 4. The vertical distance between the top of the material blocking step 5 and the wear-resistant brick 2 4 is 150 mm.

[0020] The upper chute is provided with a material retaining edge 14 at the front and rear.

[0021] The upper chute includes an arc-shaped supporting steel frame 12 fixed to the steel structure frame 7, and a wear-resistant castable layer covering the supporting steel frame 12 is cast on the outer side thereof. The wear-resistant castable layer uses a corundum steel fiber wear-resistant castable.

[0022] A plurality of positioning columns 6 are fixed to one end of the supporting steel frame 12 close to the steel structure frame 7 . The steel structure frame 7 is provided with positioning grooves matched with the positioning columns 6 . The supporting steel frame 12 is welded and fixed to the steel structure frame 7 .

[0023] The rotary kiln 1 is provided with a reducing opening 2 at one end close to the lower chute 3, and a gap is provided between the bottom of the lower chute 3 and the inner wall of the reducing opening 2. When installing the supporting steel frame 12, the positioning column 6 is inserted into the positioning groove, and then the right side wall of the supporting steel frame 12 contacts the left side wall of the steel structure frame 7, and then the supporting steel frame 12 is welded and fixed to the steel structure frame 7.

[0024] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0025] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A pelletizing chute structure, comprising an upper chute and a lower chute (3) extending into a rotary kiln (1), characterized in that: The upper chute comprises an inclined steel structure frame (7), the top of the steel structure frame (7) is provided with an inclined masonry groove (8), at least two U-shaped mounting frames (10) are welded and fixed in the masonry groove (8), a replaceable wear-resistant brick (11) is provided in the U-shaped groove of the mounting frame (10), the bottom of the steel structure frame (7) is provided with a fixing bolt (9) that passes through the mounting frame (10) and fixes the wear-resistant brick (11), wear-resistant bricks (4) are built between adjacent mounting frames (10) and between the mounting frames (10) and the inner walls of the upper and lower masonry grooves (8), the tops of the plurality of wear-resistant bricks (4) are on the same inclined plane, the bottom edge of each wear-resistant brick (11) is flush with the top edge of the lower wear-resistant brick (4), the top edge of each wear-resistant brick (11) is higher than the bottom edge of the upper wear-resistant brick (4) and forms a material blocking step (5), and the lower chute (3) is in an arc shape.

2. A pelletizing chute structure according to claim 1, characterized in that: A buffer boss (15) is provided on the inner side wall of the bottom of the lower chute (3) near one end of the upper chute, and the buffer boss (15) is flush with the bottom of the second wear-resistant brick (4) at the bottom.

3. A pelletizing chute structure according to claim 1, characterized in that: Material retaining edges (14) are provided at the front and rear of the upper chute.

4. A pelletizing chute structure according to claim 1, characterized in that: The upper chute comprises an arc-shaped supporting steel frame (12) fixed to the steel structure frame (7), and a wear-resistant castable layer covering the supporting steel frame (12) is cast on the outer side thereof.

5. A pelletizing chute structure according to claim 4, characterized in that: A positioning column (6) is fixed to one end of the supporting steel frame (12) close to the steel structure frame (7); a positioning groove matching the positioning column (6) is provided on the steel structure frame (7); and the supporting steel frame (12) is welded and fixed to the steel structure frame (7).

6. A pelletizing chute structure according to claim 1, characterized in that: The rotary kiln (1) is provided with a reducing opening (2) near one end of the lower chute (3), and a gap is provided between the bottom of the lower chute (3) and the inner wall of the reducing opening (2).

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