Inner fixing structure of kiln mouth of rotary cement kiln

Abstract

The utility model provides a cement rotary kiln mouth inner fixing structure which comprises a kiln mouth iron, a refractory brick structure, a kiln mouth back iron structure, a kiln mouth anchoring part structure and a pouring material body, an expansion joint three-ply board is arranged on the periphery of the kiln mouth iron and the pouring material body, and the kiln mouth back iron structure is in a zigzag shape; a butt joint inner anchor fixing assembly connected with kiln mouth iron is arranged on the horizontal connecting section on the upper portion of the connecting piece, and a horizontal extending section is arranged at the bottom of the vertical connecting section on the lower portion of the connecting piece. According to the inner fixing structure for the kilneye of the rotary cement kiln, the kilneye back iron structure and the anchoring part as well as the anchoring part and the pouring material are stably connected, the tensile and anti-cracking capacities are high, and the service life of the pouring material is prolonged. Meanwhile, the kilneye anchoring part is of a frame-type structure and is integrally machined and formed, and an unfilled corner is arranged on the lower left portion of the kilneye anchoring part. The castable at the corner part of the kiln mouth back iron of the rotary kiln can be effectively anchored, and the risk that the castable at the corner part of the kiln mouth back iron cracks and peels off due to the absence of an anchoring part is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of cement processing equipment, in particular to a fixed structure inside the kiln mouth of a cement rotary kiln. Background Art

[0002] In a cement clinker production line, generally, anchor bolts are needed to strengthen the refractory lining of the rotary kiln to prevent the refractory from detaching from the cement rotary kiln shell, or the refractory from cracking due to heat and falling off. The anchor bolts used at the kiln mouth of the original cement clinker production line usually use Y-shaped single-fork anchor bolts. After being bent by a punching machine, they are manually assembled and welded by professional welders. The processing procedure is complex and has many disadvantages.

[0003] Publication No.: CN115435599A, a pouring structure at the kiln mouth of a cement rotary kiln, belongs to the technical field of cement processing equipment. It solves the problem of the short service life of the pouring material at the kiln mouth of the existing cement rotary kiln. The kiln mouth of the cement rotary kiln includes a kiln mouth iron. Refractory bricks are arranged on the outer periphery of the rear end of the kiln mouth iron. The front end of the kiln mouth iron is wrapped with a kiln mouth guard iron. The kiln mouth guard iron includes a matching part and an extending part that are both annular. A plurality of stud bolts made of hollow tubes are distributed along the circumference of the end of the kiln mouth iron on the outer side of the kiln mouth guard iron. Each stud bolt includes a vertical tube part and a horizontal tube part that are perpendicular to each other. The vertical tube parts are all in front of the extending part, and the horizontal tube parts are all above the matching part. The kiln mouth guard iron, the kiln mouth iron, and the stud bolts are all integrally formed by pouring with pouring material.

[0004] The deficiencies are as follows: First, the structure of the kiln mouth guard iron is complex and it is not easy to install various anchor bolts; Second, in a high-temperature environment, the Y-shaped single-fork anchor bolt is easily affected by shear force, torsional stress, or corrosion by harmful elements, etc., and the welding joint is prone to de-welding, resulting in the falling off of the refractory; Third, it cannot meet the requirements of high-temperature operating conditions; Fourth, it requires professional welders for manual assembly and welding, and the production efficiency is low; Fifth, the contact mode between the anchor bolt and the kiln mouth is single-line contact or point contact; Sixth, the operating cycle of the refractory is short, and the service life is 8 - 10 months. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a fixed structure inside the kiln mouth of a cement rotary kiln, to solve the problems of the overall firm use of the fixed structure inside the kiln mouth of the cement rotary kiln and the difficulty of the kiln mouth guard iron structure and the anchor bolt at the kiln mouth position from falling off.

[0006] The technical solution adopted by the present utility model to solve its technical problems is as follows: A fixed structure inside the kiln mouth of a cement rotary kiln, including a kiln mouth iron, a refractory brick structure arranged on the outer periphery of the rear end of the kiln mouth iron, a kiln mouth guard iron structure arranged at the front end of the kiln mouth iron, a kiln mouth anchor structure arranged on the upper part of the kiln mouth iron, and a casting material filled between the kiln mouth guard iron structure, the kiln mouth iron, and the kiln mouth anchor structure. An expansion joint plywood is arranged on the outer periphery of the kiln mouth iron and the casting material. The kiln mouth guard iron structure is in a folded shape; a butt joint internal anchor fixing component for connecting with the kiln mouth iron is arranged on the horizontal connecting section at its upper part, a horizontal extension section is arranged at the bottom of the vertical connecting section at its lower part, an inner retaining edge is arranged at the inner end of the horizontal extension section, and an outer retaining edge is arranged at the outer end of the horizontal extension section.

[0007] The kiln mouth anchor structure includes an internal anchor structure arranged between the kiln mouth iron and the refractory brick structure, and a kiln mouth part anchor arranged on the upper part of the kiln mouth guard iron structure. The kiln mouth part anchor includes: a kiln mouth anchor and a kiln mouth external connection anchor.

[0008] The kiln mouth part anchor includes a kiln mouth anchor body. The overall shape of the kiln mouth anchor body is a 90-degree frame structure; it is integrally processed and formed by a notch welding part, a straight rod connecting part, and a horizontal rod part. The anchor body is provided with a clamping notch at the lower left, a folded hook-shaped fixed welding section with an outward turning design is arranged at the upper left of the clamping notch, and an extended connecting section is arranged at the lower right of the clamping notch.

[0009] The internal anchor structure includes a resisting anchor, a middle anchor, an outward expanding anchor, a second outward expanding anchor, and a second middle anchor.

[0010] A layer of aluminum silicate ceramic fiber paper is arranged between the refractory brick structure and the casting material.

[0011] The kiln mouth external connection anchor includes a flat-bottom outward expanding anchor arranged on the vertical connecting section of the kiln mouth guard iron structure, and a strengthening folded anchor arranged on the vertical connecting section below the flat-bottom outward expanding anchor.

[0012] The beneficial effects of the present utility model: The connection between the kiln mouth guard iron structure, the anchor, and the connection between the anchor and the casting of the fixed structure inside the kiln mouth of the cement rotary kiln is firm. The expansion joint plywood arranged on the outer periphery has strong tensile and crack resistance capabilities, improving the service life of the casting material. At the same time, the kiln mouth anchor structure is a frame structure, integrally processed and formed, and there is a notch at the lower left. It can effectively anchor the casting material at the corner part of the kiln mouth guard iron of the rotary kiln, eliminating the risk of cracking and spalling of the casting material at the corner part of the kiln mouth guard iron due to the absence of an anchor, and extending the service life of the kiln mouth casting material.

[0013] The present utility model will be described in more detail below with reference to the drawings and embodiments. Description of the Drawings

[0014] Figure 1 This is a schematic structural view of the present utility model.

[0015] Figure 2 is Figure 1 the top view of

[0016] Figure 3 This is a schematic structural view of the anchor in the kiln mouth part of the present utility model.

[0017] Figure 4 This is a schematic structural view of the outward-expanding anchor of the present utility model.

[0018] Figure 5 This is a schematic structural view of the second middle anchor of the present utility model.

[0019] Figure 6 This is a schematic structural view of the flat-bottom outward-expanding anchor of the present utility model.

[0020] Figure 7 This is a schematic structural view of the strengthened folded anchor of the present utility model.

[0021] In the figure: 1. kiln mouth iron, 2. refractory brick structure, 3. castable body, 4. expansion joint plywood, 5. horizontal connection section, 6. butt joint inner anchor fixing component, 7. vertical connection section, 8. horizontal extension section, 9. inner retaining edge, 10. outer retaining edge, 11. notch welding part, 12. straight rod connection part, 13. horizontal rod part, 14. hook-shaped fixing welding section, 15. extended connection section, 16. resisting anchor, 17. middle anchor, 18. outward-expanding anchor, 19. second outward-expanding anchor, 20. aluminosilicate ceramic fiber paper layer, 21. flat-bottom outward-expanding anchor, 22. strengthened folded anchor, 23. second middle anchor. Detailed implementation manners

[0022] In the application text, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "connection", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Embodiment 1, as Figures 1-7 shown, a fixed structure inside the kiln mouth of a cement rotary kiln includes a kiln mouth iron 1, a refractory brick structure 2 provided on the outer periphery of the rear end of the kiln mouth iron, a kiln mouth guard iron structure provided at the front end of the kiln mouth iron, a kiln mouth anchor structure provided on the upper part of the kiln mouth iron, and a casting material body 3 filled between the kiln mouth guard iron structure, the kiln mouth iron, and the kiln mouth anchor structure. An expansion joint plywood 4 is provided on the outer periphery of the kiln mouth iron and the casting material body. The kiln mouth guard iron structure is in a folded shape; a butt internal anchor fixing component 6 connected to the kiln mouth iron is provided on the horizontal connection section 5 at its upper part, a horizontal extension section 8 is provided at the bottom of the vertical connection section 7 at its lower part, an inner retaining edge 9 is provided at the inner end of the horizontal extension section, and an outer retaining edge 10 is provided at the outer end of the horizontal extension section.

[0025] The kiln mouth anchor structure includes an internal anchor structure provided between the kiln mouth iron and the refractory brick structure and a kiln mouth part anchor provided on the upper part of the kiln mouth guard iron structure. The kiln mouth part anchor includes: a kiln mouth anchor and a kiln mouth external anchor.

[0026] The kiln mouth part anchor includes a kiln mouth anchor body. The whole of the kiln mouth anchor body is in a 90-degree frame structure; it is integrally processed and formed by a notch welding part 11, a straight rod connection part 12, and a horizontal rod part 13. The anchor body is provided with a clamping notch at the lower left, a folded hook-shaped fixed welding section 14 with an outward-turning design is provided at the upper left of the clamping notch, and an extended connection section 15 is provided at the lower right of the clamping notch. Arrangement diagram of the anchors, every 2 pieces of guard iron, about 800 mm wide, is a unit, and 6 frame-shaped anchors are arranged. This kiln mouth anchor structure is an integrally formed frame-shaped anchor (heat-resistant steel material: 0Cr25Ni20), with a notch at the lower left, the whole is 90 degrees, and it has a good anchoring effect on the casting material at the corner part, and increases the frictional resistance during use, improving the adhesion of the refractory lining to the anchor. The contact form of the frame-shaped anchor is line contact, and full welding treatment is adopted, which can effectively anchor the casting material at the corner part of the kiln mouth guard iron of the rotary kiln and is not prone to high-temperature fracture, increasing the anchoring strength.

[0027] The frame anchor needs to be wrapped with two layers of electrical tape. When the rotary kiln is running, in a high-temperature environment, the electrical tape is burned out to generate an expansion gap, so as to avoid cracks caused by stress concentration inside the heat insulation structure, resulting in the shedding of refractory castables.

[0028] The described built-in anchor structure includes a resisting anchor 16, a middle anchor 17, an outward-expanding anchor 18, a second outward-expanding anchor 19, and a second middle anchor 23.

[0029] A layer of aluminosilicate ceramic fiber paper 20 is provided between the refractory brick structure and the castable body.

[0030] The externally-connected anchor at the kiln mouth includes a flat-bottom outward-expanding anchor 21 provided on the vertical connecting section of the kiln mouth guard iron structure and a strengthened folded anchor 22 provided on the lower vertical connecting section of the flat-bottom outward-expanding anchor.

[0031] Construction steps for the kiln mouth castable: cleaning of the kiln barrel - inspection of the installation of the kiln barrel, brick retaining ring, and guard iron - welding and expansion treatment of the anchor - formwork erection - casting - curing, form removal, and inspection.

[0032] Inspection before construction: First, check the burn damage and looseness of the kiln mouth guard iron, the burn damage and de-welding of the brick retaining ring, and the surface deformation and oxide layer condition of the barrel.

[0033] Welding of the anchor: The frame anchor must be subjected to expansion treatment. The frame anchor needs to be wrapped with two layers of electrical tape. The shoulder position of the guard iron is painted with 2 mm of asphalt paint. Welding is carried out according to the layout of the design drawing. Every 2 pieces of guard iron, about 800 mm wide, form a unit, and 6 frame anchors are arranged. During welding, the frame anchor and the kiln mouth guard iron are fully welded, and adjustments can be made according to the actual situation on site at the bolt hole positions.

[0034] Casting of the castable: Select AS-20 castable. According to every two pieces of kiln mouth guard iron as a unit, construction is carried out in accordance with the physical and chemical indexes of the AS-20 castable to ensure the continuity of the castable entering the mold.

[0035] The connection between the kiln mouth guard iron structure, the anchor, and between the anchor and the casting in the fixed structure at the kiln mouth of this cement rotary kiln is firm, with strong tensile and crack resistance capabilities, improving the service life of the castable. At the same time, the kiln mouth anchor structure is a frame structure, integrally processed and formed, with a notch provided at the lower left. It can effectively anchor the castable at the corner part of the kiln mouth guard iron of the rotary kiln, eliminating the risk of cracking and peeling of the castable at the corner part of the kiln mouth guard iron due to the absence of an anchor, and extending the service life of the kiln mouth castable.

[0036] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

[0037] Parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A fixed structure inside the kiln mouth of a cement rotary kiln, comprising a kiln mouth iron, a refractory brick structure arranged on the outer periphery of the rear end of the kiln mouth iron, a kiln mouth protection iron structure arranged at the front end of the kiln mouth iron, a kiln mouth anchor structure arranged on the upper part of the kiln mouth iron, and a casting material filled between the kiln mouth protection iron structure, the kiln mouth iron, and the kiln mouth anchor structure, characterized in that: An expansion joint plywood is provided on the outer periphery of the kiln mouth iron and the castable body. The kiln mouth guard iron structure includes a folded shape with a butt inner anchor fixing component connected to the kiln mouth iron provided on the horizontal connection section at its upper part, a horizontal extension section provided at the bottom of the vertical connection section at its lower part, an inner retaining edge provided at the inner end of the horizontal extension section, and an outer retaining edge provided at the outer end of the horizontal extension section.

2. The fixed structure inside the kiln mouth of the cement rotary kiln according to claim 1, characterized in that: The kiln mouth anchor structure includes a built-in anchor structure provided between the kiln mouth iron and the refractory brick structure and a kiln mouth part anchor provided on the upper part of the kiln mouth guard iron structure. The kiln mouth part anchor includes a kiln mouth anchor and a kiln mouth external connection anchor.

3. The fixed structure inside the kiln mouth of the cement rotary kiln according to claim 2, characterized in that: The kiln mouth part anchor includes a kiln mouth anchor body. The overall shape of the kiln mouth anchor body is a 90-degree frame structure, integrally processed and formed by a notch welding part, a straight rod connection part, and a horizontal rod part. The anchor body has a clamping notch at the lower left, a folded hook-shaped fixed welding section with an outward turn design at the upper left of the clamping notch, and an extended connection section at the lower right of the clamping notch.

4. The fixed structure inside the kiln mouth of the cement rotary kiln according to claim 2, characterized in that: The built-in anchor structure includes a resisting anchor, a middle anchor, an outward expanding anchor, a second outward expanding anchor, and a second middle anchor.

5. The fixed structure inside the kiln mouth of the cement rotary kiln according to claim 1, characterized in that: A layer of aluminum silicate ceramic fiber paper is provided between the refractory brick structure and the castable body.

6. The fixed structure inside the kiln mouth of the cement rotary kiln according to claim 2, characterized in that: The kiln mouth external connection anchor includes a flat-bottomed outward expanding anchor provided on the vertical connection section of the kiln mouth guard iron structure and a strengthened folded anchor provided on the vertical connection section below the flat-bottomed outward expanding anchor.

Images