Anti-cracking unshaped refractory rotary kiln mouth structure

Abstract

The utility model discloses an anti-cracking unshaped refractory rotary kiln mouth structure which comprises a refractory lining layer fixed on the inner side wall of a rotary kiln, and an expansion joint is arranged on the refractory lining layer. The expansion joints consist of a plurality of right-handed expansion joints and a plurality of left-handed expansion joints, and the plurality of right-handed expansion joints and the plurality of left-handed expansion joints divide the refractory lining layer into a plurality of lining layer division blocks; the expansion joint is filled with a fireproof flexible filler which is a ceramic fiber felt; the kilneye structure has good thermal shock resistance, the kilneye experiences frequent temperature changes during working, such as kiln opening, kiln stopping, material feeding amount and property changes and the like, and the kilneye structure can bear rapid changes of the temperature and does not crack; the anchoring structure has good anchoring performance, the anchoring part is better wrapped by the refractory material, firm connection is formed, the mechanical occlusal force between the anchoring part and the refractory lining layer is effectively enhanced, and it is ensured that the anchoring part and the refractory material have good binding force.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to a crack-resistant unshaped refractory rotary kiln inlet structure. Background Technology

[0002] The common method for constructing rotary kiln castable linings is to divide the lining into equal sections along the radial direction of the kiln body, pre-weld several "Y"-shaped anchor hooks at designated locations within the rotary kiln, and then erect molds along the length of the kiln body for casting. During the long-term production process of the rotary kiln, the refractory lining is exposed to high temperatures for extended periods. Due to thermal expansion and volume changes, the refractory lining is prone to cracking or even detachment, thus affecting the service life of the rotary kiln. Furthermore, this on-site integral casting construction is difficult, labor-intensive, and costly in terms of formwork erection, and maintenance of the rotary kiln refractory lining is also quite troublesome. Utility Model Content

[0003] The purpose of this invention is to provide a crack-resistant rotary kiln inlet structure for monolithic refractory materials, which can effectively prevent cracking of the refractory lining and improve its service life.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A crack-resistant rotary kiln inlet structure for an amorphous refractory material includes a refractory lining fixed to the inner wall of the rotary kiln, and the refractory lining has expansion joints.

[0006] The expansion joint consists of multiple right-handed and multiple left-handed expansion joints, which divide the refractory lining into multiple lining segments.

[0007] Note: The interlocking design of right-hand and left-hand expansion joints can better withstand thermal expansion and contraction deformation and is less prone to stress concentration.

[0008] The expansion joint is filled with refractory flexible filler, which is ceramic fiber felt.

[0009] Note: Ceramic fiber felt has good thermal insulation properties and flexibility. It can be compressed when the kiln expands, which plays a buffering role, prevents hot air from leaking out of the expansion joint, and avoids stress concentration and cracking caused by unreasonable expansion joint.

[0010] The inner wall of the rotary kiln is provided with multiple anchoring structures, including multiple anchoring support shafts fixed to the inner wall of the rotary kiln and extending radially thereon. An anchoring support inner ring is sleeved on the anchoring support shaft, and an anchoring support outer ring coaxial with it is provided on the outside of the anchoring support inner ring.

[0011] The outer wall of the inner ring of the anchoring support is fixedly connected to the inner wall of the outer ring of the anchoring support by multiple buffer connecting rings.

[0012] Multiple L-shaped anchoring connecting plates are fixed on the outer ring of the anchoring support, and a spiral anchoring spring is fixed to the outer end of the anchoring connecting plate.

[0013] The anchoring connector and the spiral anchoring spring are embedded and fixed in the fire-resistant lining.

[0014] Note: When the kiln opening expands or contracts due to temperature changes, the connection parts of the anchors can be stretched or compressed accordingly to avoid excessive stress on the refractory material due to rigid connection.

[0015] Preferably, a flexible buffer layer is provided between the refractory lining and the inner wall of the rotary kiln, and the flexible buffer layer is a flexible ceramic fiber felt.

[0016] Note: When the kiln opening is subjected to external forces such as thermal stress and mechanical vibration, the flexible buffer layer can absorb some of the energy, reducing the impact and damage to the refractory material.

[0017] Preferably, the spiral anchoring spring has a tapered spiral structure with a gradually changing diameter. The end of the spiral anchoring spring connected to the anchoring connecting piece has a smaller diameter, while the end of the spiral anchoring spring connected to the anchoring connecting piece has a larger diameter.

[0018] Note: Spiral anchors are more effective at preventing refractory materials from falling off when subjected to thermal and mechanical stress.

[0019] Compared with the prior art, the beneficial effects of this utility model are reflected in the following aspects:

[0020] 1. The structure of this utility model is reasonably designed. The kiln opening structure has good thermal shock resistance. The kiln opening will experience frequent temperature changes during operation, such as kiln opening, kiln shutdown, and changes in the amount and properties of material feed. The kiln opening structure can withstand the rapid temperature changes without cracking.

[0021] 2. The new anchoring structure of this utility model has good anchoring performance, which allows the refractory material to better wrap the anchor and form a firm connection, effectively enhancing the mechanical interlocking force between the anchor and the refractory lining layer, and ensuring good bonding force between the anchor and the refractory material.

[0022] 3. The kiln opening structure of this utility model has good expansion adaptability. The entire anchoring structure, together with the inner lining layer segment, can withstand displacement along the axis parallel to the rotary kiln, displacement along the radial direction of the rotary kiln, and displacement around the circumference of the rotary kiln. Attached Figure Description

[0023] Figure 1 This is the front view of this utility model;

[0024] Figure 2 yes Figure 1 The left view;

[0025] Figure 3 This is a schematic diagram of the anchoring structure of this utility model;

[0026] Figure 4 This is a top view of the outer ring of the anchoring support of this utility model.

[0027] In the figure, 10-rotary kiln, 101-flexible buffer layer, 11-anchoring structure, 111-anchoring support shaft, 112-anchoring support inner ring, 113-anchoring support outer ring, 114-buffer connecting ring, 115-anchoring connecting piece, 116-spiral anchoring spring, 20-refractory inner lining, 201-inner lining layer segment, 21-expansion joint, 211-right-hand expansion joint, 212-left-hand expansion joint, 22-refractory flexible filler. Detailed Implementation

[0028] The following is combined Figures 1-4 This utility model will be described in detail. For ease of description, the orientations mentioned below are defined as follows: The directions of up, down, left, right, front, and back mentioned below are consistent with the directions of up, down, left, right, front, and back in the projection relationship of their respective main views or structural schematic diagrams.

[0029] Example 1:

[0030] A crack-resistant rotary kiln inlet structure made of monolithic refractory material, such as... Figure 1 As shown, it includes a refractory lining 20 fixed to the inner wall of the rotary kiln 10, and the refractory lining 20 has an expansion joint 21.

[0031] The refractory lining layer 20 is a calcium aluminate cement-bonded castable of existing technology;

[0032] like Figure 1 As shown, the expansion joint 21 is composed of multiple right-handed expansion joints 211 and multiple left-handed expansion joints 212, which divide the refractory inner lining 20 into multiple inner lining segment blocks 201.

[0033] The expansion joint 21 is filled with fire-resistant flexible filler 22, which is ceramic fiber felt (commercially available product).

[0034] like Figure 2 As shown, a flexible buffer layer 101 is provided between the refractory lining 20 and the inner wall of the rotary kiln 10. The flexible buffer layer 101 is a flexible ceramic fiber felt (commercially available product).

[0035] like Figure 1 As shown, multiple anchoring structures 11 are provided on the inner wall of the rotary kiln 10, such as...Figure 3 As shown, the anchoring structure 11 includes a plurality of anchoring support shafts 111 fixed on the inner wall of the rotary kiln 10 and extending radially thereon. An anchoring support inner ring 112 is sleeved on the anchoring support shaft 111, and an anchoring support outer ring 113 coaxial with it is provided on the outside of the anchoring support inner ring 112.

[0036] like Figure 4 As shown, the outer wall of the inner ring 112 of the anchor support and the inner wall of the outer ring 113 of the anchor support are fixedly connected by multiple buffer connecting rings 114.

[0037] like Figure 3 As shown, multiple L-shaped anchoring connecting pieces 115 are fixed on the outer ring 113 of the anchoring support, and a spiral anchoring spring 116 is fixed to the outer end of the anchoring connecting piece 115.

[0038] Anchoring connection piece 115 and spiral anchoring spring 116 are embedded and fixed in the fire-resistant inner lining layer 20;

[0039] The anchoring support shaft 111, the anchoring support inner ring 112, the anchoring support outer ring 113, the buffer connecting ring 114, the anchoring connecting piece 115, and the spiral anchoring spring 116 are all made of chromium-nickel alloy heat-resistant steel. The chromium-nickel alloy heat-resistant steel used in this embodiment is a commercially available product.

[0040] Example 2:

[0041] Based on Example 1, such as Figure 3 As shown, the spiral anchoring spring 116 has a tapered spiral structure with a gradually changing diameter. The end of the spiral anchoring spring 116 connected to the anchoring connecting piece 115 has a smaller diameter, and the end of the spiral anchoring spring 116 connected away from the anchoring connecting piece 115 has a larger diameter.

[0042] The diameter of the smaller end of the spiral anchoring spring 116 is 5cm, and the diameter of the larger end of the spiral anchoring spring 116 is 1.5 times that of the smaller end.

[0043] In practical application, this utility model first lays a flexible buffer layer 101 on the inner wall of the rotary kiln 10, then fixes multiple anchoring structures 11 on the inner wall of the rotary kiln 10, then pours a refractory lining layer 20 on the inner wall of the rotary kiln 10, and after the refractory lining layer 20 dries, opens multiple right-handed expansion joints 211 and multiple left-handed expansion joints 212 on the refractory lining layer 20, and finally fills the right-handed expansion joints 211 and left-handed expansion joints 212 with refractory flexible filler 22.

[0044] The inner ring 112 of the anchoring support is fixedly connected to the anchoring support shaft 111 by a threaded connection, and each inner lining layer segment 201 is fixed and constrained by a separate anchoring structure 11.

[0045] The outer wall of the inner ring 112 of the anchoring support and the inner wall of the outer ring 113 of the anchoring support are fixedly connected by multiple buffer connecting rings 114. When the refractory lining 20 is deformed by heat and generates a small displacement, the structure can adapt to the deformation displacement of the refractory lining 20, and avoid stress concentration caused by deformation displacement of the refractory lining 20, which would lead to cracking and damage of the refractory lining 20.

[0046] The entire anchoring structure 11, together with the inner lining segment 201, can withstand displacement in the direction parallel to the axis of the rotary kiln 10, displacement in the radial direction of the rotary kiln 10, and displacement around the circumference of the rotary kiln 10.

Claims

1. A crack-resistant rotary kiln inlet structure for monolithic refractory materials, characterized in that, Includes a refractory lining (20) fixed to the inner wall of the rotary kiln (10), the refractory lining (20) having expansion joints (21); The expansion joint (21) is composed of multiple right-hand expansion joints (211) and multiple left-hand expansion joints (212). The multiple right-hand expansion joints (211) and the multiple left-hand expansion joints (212) divide the refractory inner lining (20) into multiple inner lining segment blocks (201). The expansion joint (21) is filled with refractory flexible filler (22), which is ceramic fiber felt; The rotary kiln (10) has multiple anchoring structures (11) on its inner wall. Each anchoring structure (11) includes multiple anchoring support shafts (111) that are fixed to the inner wall of the rotary kiln (10) and extend radially therein. An anchoring support inner ring (112) is fitted on the anchoring support shaft (111), and an anchoring support outer ring (113) that is coaxial with the anchoring support inner ring (112) is provided on the outside of the anchoring support inner ring (112). The outer wall of the inner ring (112) of the anchoring support and the inner wall of the outer ring (113) of the anchoring support are fixedly connected by a plurality of buffer connecting rings (114); Multiple L-shaped anchoring connecting pieces (115) are fixed on the outer ring (113) of the anchoring support, and a spiral anchoring spring (116) is fixed at the outer end of the anchoring connecting piece (115). The anchoring connecting piece (115) and the spiral anchoring spring (116) are embedded and fixed in the fire-resistant inner lining (20).

2. The crack-resistant rotary kiln inlet structure for monolithic refractory materials according to claim 1, characterized in that, A flexible buffer layer (101) is provided between the refractory lining (20) and the inner wall of the rotary kiln (10), and the flexible buffer layer (101) is a flexible ceramic fiber felt.

3. The kiln mouth structure for a crack-resistant monolithic refractory rotary kiln according to claim 1, characterized in that, The spiral anchoring spring (116) is a tapered spiral structure with a gradually changing diameter. The end of the spiral anchoring spring (116) connected to the anchoring connecting piece (115) has a smaller diameter, while the end of the spiral anchoring spring (116) connected away from the anchoring connecting piece (115) has a larger diameter.

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