Knotting method for large casting ladle lining

Abstract

The invention relates to the technical field of casting ladle lining knotting, in particular to an ultra-large casting ladle lining knotting method. In order to solve the problem that in the prior art, an ultra-large casting ladle lining is prone to cracking in the using process, a novel ultra-large casting ladle lining knotting process scheme is provided, and the feasibility of ultra-large casting ladle lining knotting is achieved. Compared with a traditional bricked ladle lining, the pouring ladle lining knotting method is longer in service time and easier to maintain, and the labor intensity of workers and the material cost are greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ladle lining knotting, and more particularly to a method for knotting an ultra-large ladle lining. Background Art

[0002] Domestic ladles commonly use brickwork for lining, or a knotting process for some smaller ladles. Currently, the largest known ladle tonnage using this method is 35 tons. The larger the ladle, the more susceptible it is to cracking. This knotting process is specifically designed for our company's ultra-large 40-ton ladle linings. By rationally designing the crucible mold, selecting suitable knotting materials, and developing a specific knotting process, we address the knotting issue for these ultra-large ladles. Summary of the Invention

[0003] The problem that the knotted lining of super-large ladle in the prior art is easy to crack during use is solved. A new knotted process solution for the lining of super-large ladle is provided, which realizes the feasibility of knotting the lining of super-large ladle.

[0004] The object of the present invention is achieved by providing a knotting method for a large ladle lining, the knotting method comprising the following steps:

[0005] S1: Design a crucible mold, which includes an isolation bar, a movable block, and a mold body. The mold body and the isolation bar are connected by a double-headed screw;

[0006] S2: fixing the crucible mold in the ladle, with the crucible mold coinciding with the center point of the ladle;

[0007] S3: Knotting the ladle wall, adding the mixed knotting material between the crucible mold and the ladle wall within a preset time;

[0008] S4: demoulding the wall, removing the isolation strip and the mold body;

[0009] S5: Tie a knot at the bottom of the bag. After taking out the loose block, fill the knotting material into the bottom of the bag to complete the knotting.

[0010] In one embodiment, the ratio of the ladle bottom thickness to the ladle wall thickness is 2.5:1-2:1.

[0011] In one embodiment, the preset time is 3 minutes.

[0012] In one embodiment, the knotting material is refractory castable.

[0013] In one embodiment, the ladle needs to be continuously vibrated using a vibration mechanism for 3 minutes after pouring the knotting material and pouring.

[0014] In one embodiment, the upper portion of the crucible mold and the ladle opening of the ladle are welded together.

[0015] In one embodiment, the knotting process is to first pack the wall, and then tie the knot to pack the bottom after removing the mold.

[0016] In one embodiment, the weight ratio of water to knotting material is in the range of 5:100 to 7:100.

[0017] In one embodiment, the ladle has an upper diameter of 2350 mm, a lower diameter of 2173 mm, and a height of 2950 mm.

[0018] In one embodiment, the crucible mold has a mold body thickness of 10 mm, an upper diameter of 1925 mm, and a lower diameter of 1764 mm.

[0019] The ladle lining knotting method of the present invention has a longer service life and is simpler to maintain than the traditional brick lining, which greatly reduces the labor intensity of workers and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the crucible mold structure;

[0021] Figure 2 Schematic diagram of the ladle structure;

[0022] Figure 3 Schematic diagram of the ladle structure;

[0023] 100-crucible mold, 110-isolating strip, 120-live block, 200-ladle. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] A knotting method for a large ladle lining, comprising the following steps:

[0027] S1: Design a crucible mold, the crucible mold comprising an isolation bar, a loose block, and a mold body, the mold body and the isolation bar being connected by a double-headed screw, the loose block fixedly connecting the molds of two adjacent crucible molds, preferably, the loose block being a K-groove loose block;

[0028] S2: fixing the crucible mold in the ladle, with the crucible mold coinciding with the center point of the ladle;

[0029] S3: Knotting the ladle wall, adding the mixed knotting material between the crucible mold and the ladle wall within a preset time, the preset time being 3 minutes;

[0030] S4: demoulding the wall, removing the isolation strip and the mold body;

[0031] S5: knotting the bottom of the ladle. After taking out the loose block, the knotting material is filled into the bottom of the ladle to complete the knotting. The knotting material is refractory castable. The ratio of the bottom thickness of the ladle to the wall thickness of the ladle is 2.5:1-2:1.

[0032] After pouring the knotting material and for 3 minutes after pouring, the ladle must be vibrated continuously using a vibration mechanism. The upper part of the crucible mold is welded to the ladle mouth. During the knotting process, the wall is first packed, and after the mold is removed, the bottom is knotted. The weight ratio of water to knotting material ranges from 5:100 to 7:100. The upper diameter of the ladle is 2350mm, the lower diameter is 2173mm, and the height is 2950mm. The mold body thickness of the crucible mold is 10mm, the upper diameter is 1925mm, and the lower diameter is 1764mm.

[0033] The ladle lining knotting method of the present invention has a longer service life and is simpler to maintain than the traditional brick lining, which greatly reduces the labor intensity of workers and material costs.

[0034] In order to better illustrate the knotting process scheme of the super-large ladle lining of the present invention, the actual production of a ladle is taken as an example. It mainly includes three parts, namely the design of the crucible mold, the selection of knotting materials and the formulation of the knotting process.

[0035] The first is the design of the crucible mold. It is necessary to ensure that the ladle has sufficient capacity and that the lining has sufficient thickness and strength to ensure safety, especially the thickness ratio of the ladle bottom and the ladle wall. Preferably, the bottom thickness: the ladle wall thickness should be between 2.5:1 and 2:1. The design must be appropriate, as well as the treatment plan for the joint between the bottom and the ladle wall, and the design of the crucible mold demoulding process.

[0036] The crucible mold used this time is as follows Figure 1As shown, it is a barrel-shaped structure with a wide top and narrow bottom. Specifically, the upper diameter is 1925 mm, the lower diameter is 1764 mm, the height is 2564 mm, and the mold thickness is 10 mm. Figure 2 As shown, corresponding to the crucible mold structure, specifically, the upper diameter is 2350 mm, the lower diameter is 2173 mm, and the height is 2950 mm. The thickness of the bottom and wall of the knotted bag is 400 mm and 200 mm respectively.

[0037] The mold body of the crucible mold 100 and the spacer bars 110 are assembled and connected together using a double-headed screw.

[0038] Next, select the appropriate knotting material. The larger the ladle's tonnage, the more likely it is to crack, leading to greater safety hazards. Therefore, the stability of the knotting material is crucial. In this example, the knotting material is Xiangyang Juli YSJ-1D castable, an Al2O3-SiO2 refractory castable with excellent medium- and high-temperature strength and wear resistance, making it suitable for molten iron transfer ladles and pouring ladles.

[0039] Finally, the knotting process is formulated. The knotting process formulated this time is as follows:

[0040] Clean the inner wall and bottom of the ladle and make preparations;

[0041] Apply 5mm of butter to the outside of the crucible mold to facilitate demoulding later. Note that the butter is wrapped with two layers of plastic wrap to prevent the butter from falling off during the knotting process.

[0042] Place the crucible mold in the ladle, find the center point, and weld the upper part of the crucible mold to the ladle mouth to prevent the crucible mold from shifting during the knotting process, resulting in uneven ladle wall thickness;

[0043] During the knotting process, pay attention to the order in which the bottom and wall of the package are knotted: knot the wall first. After the mold is removed, the movable block 120 will be raised to form a pit on the wall of the package. At this time, knot the bottom of the package. The knotting material will overflow the pit, and the bottom and wall of the package will be tightly connected together through the pit.

[0044] The specific knotting process is as follows:

[0045] The first step is to weigh the water and materials. The weight ratio of water to knotting material is 6:100. Use a bowl mixer to mix evenly and add it to the gap between the crucible mold and the bag wall within three minutes.

[0046] In the second step, when the added amount reaches one-third of the ladle height, start using a φ70mm 380V portable vibrator to rotate the ladle diagonally to vibrate and knot. Pour the knotting material continuously in the middle. The vibration cannot stop, otherwise the material will segregate unevenly. When the knotting material is fully filled, vibrate for 3 minutes. After the surface of the material is fully integrated and flattened, stop vibrating and knotting. Then leave the ladle still and dry it in the shade for at least 48 hours before demoulding.

[0047] The third step is demoulding. The crucible mold isolation strips are removed to shrink the inner diameter of the crucible mold. When the crucible mold shrinks, a gap will be generated between the mold and the liner. Then all the stud bolts are gradually removed to separate the crucible mold parts. Finally, a crane is used to lift out the crucible mold parts one by one. After lifting out, they are reassembled for future use.

[0048] Step 4: Continue to dry the ladle in the shade for at least 48 hours to prevent cracks from forming during high-temperature baking.

[0049] The fifth step is to tie the bottom of the ladle. Use a pneumatic shovel to vibrate the K-slot loose blocks embedded in the ladle lining to create gaps around them, then take out the K-slot loose blocks, mix them evenly according to the water-material ratio in the first step, and fill them into the bottom of the ladle. After filling, use a portable vibrating rod to rotate diagonally to start vibrating and knotting. When all the knotting materials are filled, vibrate for 3 minutes, and then stop vibrating and knotting after the surface of the material is fully integrated and flat. Then place the ladle horizontally and do not move. Dry in the shade for no less than 48 hours.

[0050] Step 6: Use natural gas to bake for 24 hours before putting it into use.

[0051] By controlling the above three aspects, the knotting and application of the super-large ladle lining can be realized. The super-large ladle lining knotted by this process has great advantages over the previous brick lining, as shown in Table 1.

[0052] Table 1 Comparison of brick lining and knotted lining

[0053]

[0054] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A knotting method for a large ladle lining, characterized in that: The knotting method comprises the following steps: S1: Design a crucible mold, which includes an isolation bar, a movable block, and a mold body. The mold body and the isolation bar are connected by a double-headed screw; S2: fixing the crucible mold in the ladle, with the crucible mold coinciding with the center point of the ladle; S3: Knotting the ladle wall, adding the mixed knotting material between the crucible mold and the ladle wall within a preset time; S4: demoulding the wall, removing the isolation strip and the mold body; S5: Tie a knot at the bottom of the bag. After taking out the loose block, fill the knotting material into the bottom of the bag to complete the knotting.

2. The knotting method for a large ladle lining according to claim 1, characterized in that: The ratio of the ladle bottom thickness to the ladle wall thickness is 2.5:1-2:

1.

3. The knotting method for a large ladle lining according to claim 1, characterized in that: The preset time is 3 minutes.

4. The knotting method for a large ladle lining according to claim 1, wherein the knotting material is a refractory castable.

5. The knotting method for a large ladle lining according to claim 1, characterized in that: The ladle should be vibrated continuously using the vibration mechanism while pouring the knotting material and for 3 minutes after pouring.

6. The knotting method for a large ladle lining according to claim 1, characterized in that: The upper portion of the crucible mold and the ladle opening of the ladle are welded tightly.

7. The knotting method for a large ladle lining according to claim 1, characterized in that: During the knotting process, the walls are packed first, and after the mold is removed, the bottom is knotted.

8. The knotting method for a large ladle lining according to claim 1, characterized in that: The weight ratio of water to knotting material ranges from 5:100 to 7:

100.

9. The knotting method for a large ladle lining according to claim 1, characterized in that: The ladle has an upper diameter of 2350 mm, a lower diameter of 2173 mm, and a height of 2950 mm.

10. The knotting method for a large ladle lining according to claim 1, characterized in that: The crucible mold has a mold body thickness of 10 mm, an upper diameter of 1925 mm, and a lower diameter of 1764 mm.

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