Vacuum induction crucible smelting furnace capable of being quickly disassembled and smelting furnace assembling method

Abstract

The invention discloses a vacuum induction crucible smelting furnace capable of being quickly disassembled and a smelting furnace assembly method, relates to the technical field of vacuum induction crucible smelting furnaces, and aims to solve the problem that the production efficiency is low due to the fact that the time consumed for replacing a crucible of an existing induction crucible smelting furnace is long and even longer than the actual use time. Comprising a crucible jacket, a crucible lining, insulating cloth, filling sand, an induction coil and an aluminum silicate fiber felt, a crucible lining is sleeved with the crucible outer sleeve, insulating cloth is arranged on the outer side of the crucible outer sleeve, filling sand is filled between the crucible outer sleeve and the insulating cloth, an aluminum silicate fiber felt used for compacting the filling sand downwards is arranged between the crucible outer sleeve and the insulating cloth, an induction coil is arranged on the outer side of the insulating cloth, and a protruding block is arranged on the outer side of the top end of the crucible outer sleeve. The protruding blocks downwards extrude the aluminum silicate fiber felt, a gap of 1-2 mm is formed between the crucible outer sleeve and the crucible lining, and the induction crucible is used for induction crucible smelting.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum induction crucible melting furnaces, and particularly relates to a vacuum induction crucible melting furnace that can be quickly disassembled and a melting furnace assembly method. Background Art

[0002] Induction melting is a metallurgical technology that uses the principle of electromagnetic induction to heat and melt metals. Its core is to generate an alternating magnetic field in the induction coil through an alternating current, so that eddy currents are induced inside the metal charge, thereby generating Joule heat to achieve heating and melting. The heat in induction melting is directly generated inside the metal, and the thermal efficiency is as high as 60 - 75%. By adjusting the current frequency and power, induction melting can accurately control the melting temperature; induction melting has no flame or combustion products, which can reduce metal oxidation and gas inclusions; and induction melting can melt steel, cast iron, copper, aluminum, precious metals and special alloys. Therefore, it has the advantages of high efficiency and energy saving, precise temperature control, clean melting, and wide applicability. Most high-temperature alloy castings are formed by vacuum melting and casting. The vacuum state can effectively reduce the oxidation of liquid metal, thereby improving the internal slag inclusion of the casting and enabling the casting to obtain good surface quality; and the crucible is a container for storing solid and liquid high-temperature alloys in a vacuum induction furnace and is an essential part of a vacuum induction furnace.

[0003] At the same time, the crucible is a consumable. As the number of smelting batches increases, the inner wall of the crucible is damaged, and the damaged crucible has a serious impact on the quality of high-temperature alloy castings. Therefore, each production unit has requirements for the usage frequency of the crucible according to the casting quality requirements. For some important parts, the crucible needs to be replaced after only one use. However, the traditional crucible replacement takes a long time, even longer than the actual use time, and the production efficiency is low. All high-temperature alloy casting manufacturing enterprises urgently need to solve this problem. Summary of the Invention

[0004] In order to solve the problem that the existing induction crucible melting furnace takes a long time to replace the crucible, even longer than the actual use time, resulting in low production efficiency, the present invention further provides a vacuum induction crucible melting furnace that can be quickly disassembled and a melting furnace assembly method to solve the problems raised in the above background art.

[0005] The technical solution of the present invention is as follows:

[0006] A vacuum induction crucible melting furnace that can be quickly disassembled includes a crucible outer sleeve, a crucible inner lining, insulating cloth, filling sand, an induction coil, and a silica-aluminum fiber felt;

[0007] The crucible inner lining is sleeved inside the crucible outer sleeve. Insulating cloth is arranged on the outer side of the crucible outer sleeve. Filling sand is filled between the crucible outer sleeve and the insulating cloth. A silica-aluminum fiber felt for pressing the filling sand downward is arranged between the crucible outer sleeve and the insulating cloth. An induction coil is arranged on the outer side of the insulating cloth;

[0008] Further, a convex block is provided on the outer side of the top end of the crucible outer casing, and the convex block presses the aluminosilicate fiber felt downward.

[0009] Further, a 1-2 mm gap is provided between the crucible outer casing and the crucible inner lining.

[0010] Further, the height of the aluminosilicate fiber felt is 50 mm.

[0011] Further, the thickness of the filling sand is 20-45 mm.

[0012] Further, the crucible outer casing is 10-15 mm higher than the induction coil.

[0013] Further, the crucible inner lining is 20-25 mm higher than the crucible outer casing.

[0014] Further, the filling sand is selected as fused magnesia sand with a size of 1-4 mm.

[0015] Further, the specification and proportion of the filling sand are 0-1 mm:1-2 mm:2-4 mm = 1:2:1.

[0016] An assembly method for a quickly detachable vacuum induction crucible melting furnace, the method comprising the following steps:

[0017] Step 1: Wrap an insulating cloth inside the induction coil;

[0018] Step 2: Place the crucible outer casing at the center of the induction coil and make the crucible outer casing concentric with the induction coil;

[0019] Step 3: Fill the space between the crucible outer casing and the induction coil with filling sand until the filling sand is 50 mm away from the top end of the induction coil;

[0020] Step 4: Continue to fill the gap between the crucible outer casing and the induction coil with the aluminosilicate fiber felt until the aluminosilicate fiber felt is flush with the top end of the induction coil;

[0021] Step 5: Place the crucible inner lining inside the crucible outer casing and make the crucible inner lining concentric with the crucible outer casing.

[0022] The present invention has the following beneficial effects compared with the prior art:

[0023] 1. A quickly detachable vacuum induction crucible melting furnace is provided with a crucible outer casing and a crucible inner lining to form a double-layer crucible. When the usage limit of the crucible inner lining is reached, only the crucible inner lining needs to be replaced to enter the next melting process. The crucible inner lining is 20-25 mm higher than the crucible outer casing, which is convenient for hoisting and replacing the crucible inner lining.

[0024] 2. A gap of 1-2 mm is provided between the crucible outer sleeve and the crucible inner lining. When the crucible inner lining expands thermally during heating, the crucible outer sleeve and the crucible inner lining do not squeeze and deform each other, preventing damage to the crucible outer sleeve and the crucible inner lining. And during replacement, when the temperature of the crucible inner lining drops to 60-75 °C, the crucible outer sleeve and the crucible inner lining can be separated and hoisted, improving the replacement efficiency of the crucible inner lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of this vibration detection device Figure Ⅰ .

[0026] In the figure: 1. Crucible outer sleeve; 2. Crucible inner lining; 3. Insulating cloth; 4. Filling sand; 5. Induction coil; 6. Protrusion; 7. Aluminum silicate fiber felt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] DETAILED DESCRIPTION OF THE EMBODIMENT 1: Refer to Figure 1 As shown, a vacuum induction crucible melting furnace that can be quickly disassembled. This embodiment includes a crucible outer sleeve 1, a crucible inner lining 2, an insulating cloth 3, filling sand 4, an induction coil 5, and an aluminum silicate fiber felt 7;

[0028] The crucible inner lining 2 is sleeved inside the crucible outer sleeve 1. An insulating cloth 3 is provided on the outer side of the crucible outer sleeve 1. Filling sand 4 is filled between the crucible outer sleeve 1 and the insulating cloth 3. An aluminum silicate fiber felt 7 for compacting the filling sand 4 downward is provided between the crucible outer sleeve 1 and the insulating cloth 3. An induction coil 5 is provided on the outer side of the insulating cloth 3.

[0029] Further, the size of the induction coil 5 is Φ230mm×240mm. Two layers of insulating cloth 3 are wrapped inside the induction coil 5. The insulating cloth 3 serves to wrap and fill the filling sand 4. 50mm of filling sand 4 is paved flat on the bottom surface of the insulating cloth 3. The size of the crucible outer sleeve 1 is an outer diameter of Φ175mm×250mm. The crucible outer sleeve 1 is concentrically placed inside the induction coil 5. Filling sand 4 is filled between the crucible outer sleeve 1 and the induction coil 5 until the filling sand 4 is 50mm away from the top end of the induction coil 5. A single-layer annular aluminosilicate fiber felt 7 with a thickness of 10mm is pressed on the upper end of the filling sand 4 until the aluminosilicate fiber felt 7 is flush with the induction coil 5. The annular aluminosilicate fiber felt 7 is used to compact the filling sand 4 to prevent the filling sand 4 from overflowing due to vibration during induction melting. Finally, the crucible inner lining 2 is placed inside the crucible outer sleeve 1, and the gap between the crucible inner lining 2 and the crucible outer sleeve 1 is made equal. When performing single-time melting for metal melting that requires changing the crucible, if the crucible outer sleeve 1 is not damaged, only the crucible inner lining 2 needs to be replaced each time for the melting process to continue. Since the crucible outer sleeve 1 does not come into contact with the molten metal and there is a gap between the crucible outer sleeve 1 and the crucible inner lining 2, it can accommodate the high-temperature expansion of the crucible inner lining 2. Therefore, the crucible outer sleeve 1 is minimally damaged during actual use. Each time of replacement only requires using steel pliers to take out the used crucible inner lining 2 and then putting in a new crucible inner lining to continue the melting process. Each crucible outer sleeve 1 can participate in at least 50 times of melting. It takes 2 - 5 minutes to replace the crucible inner lining 2. This can significantly improve production efficiency and also reduce the cost of the crucible equipment.

[0030] Specific Embodiment 2: Refer to Figure 1 As shown, a convex block 6 is provided on the outer side of the top end of the crucible outer sleeve 1 in this embodiment, and the convex block 6 presses down on the aluminosilicate fiber felt 7.

[0031] Further, by using the convex block 6 fixed on the crucible outer sleeve 1 to press the aluminosilicate fiber felt 7, self-adaptive compaction of the filling sand 4 can be achieved. When the filling sand 4 becomes more compact due to vibration and its volume decreases, the crucible outer sleeve 1 drops accordingly, and the convex block 6 continues to press the aluminosilicate fiber felt 7 as it drops, realizing self-adaptive compaction of the filling sand 4.

[0032] Specific Embodiment 3: Refer to Figure 1 As shown, a 1 - 2mm gap is provided between the crucible outer sleeve 1 and the crucible inner lining 2 in this embodiment.

[0033] Further, a 1 - 2mm gap is provided between the crucible outer sleeve 1 and the crucible inner lining 2 so that when the crucible inner lining 2 expands thermally during heating, the crucible outer sleeve 1 and the crucible inner lining 2 do not squeeze and deform each other, avoiding damage to the crucible outer sleeve 1 and the crucible inner lining 2. And during replacement, when the temperature of the crucible inner lining 2 drops to 60 - 75°C, the separation and hoisting of the crucible outer sleeve 1 and the crucible inner lining 2 can be carried out, improving the replacement efficiency of the crucible inner lining 2.

[0034] Embodiment 4: Refer to Figure 1 As shown, the height of the aluminosilicate fiber felt 7 in this embodiment is 50 mm.

[0035] Embodiment 5: Refer to Figure 1 As shown, the thickness of the filling sand 4 in this embodiment is 20 - 45 mm.

[0036] Embodiment 6: Refer to Figure 1 As shown, the crucible outer sleeve 1 in this embodiment is 10 - 15 mm higher than the induction coil. Setting this gap facilitates the filling of the filling sand 4.

[0037] Embodiment 7: Refer to Figure 1 As shown, in this embodiment, the crucible inner lining 2 is 20 - 25 mm higher than the crucible outer sleeve.

[0038] Furthermore, the crucible inner lining 2 is 20 - 25 mm higher than the crucible outer sleeve, thus avoiding the molten metal spilling onto the crucible outer sleeve 1 and into the gap between the crucible outer sleeve 1 and the crucible inner lining 2 when the crucible tilts, preventing damage to the crucible outer sleeve 1 and the adhesion between the crucible outer sleeve 1 and the crucible inner lining 2. At the same time, it also facilitates the removal of the crucible inner lining 2. As an alternative embodiment, a lifting hole can be opened at the upper end of the crucible inner lining 2 to facilitate the replacement of the crucible inner lining 2.

[0039] Embodiment 8: Refer to Figure 1 As shown, the filling sand 4 in this embodiment is selected as fused magnesia sand with a particle size of 1 - 4 mm.

[0040] Embodiment 9: Refer to Figure 1 As shown, the specification and proportion of the filling sand 4 in this embodiment are 0 - 1 mm:1 - 2 mm:2 - 4 mm = 1:2:1.

[0041] Furthermore, the specification and proportion of the filling sand 4 are 0 - 1 mm:1 - 2 mm:2 - 4 mm = 1:2:1. After the filling sand 4 is mixed evenly, it is filled into the space between the crucible outer sleeve 1 and the induction coil 5. Mixing filling sand 4 of different specifications can reduce the gaps between large - particle filling sands, making the support effect stronger and reducing the height drop of the filling sand 4 caused by vibration.

[0042] Embodiment 10: Refer to Figure 1 As shown, an assembly method for a quickly detachable vacuum induction crucible melting furnace, the method comprising the following steps:

[0043] Step 1: Wrap the insulating cloth 3 inside the induction coil 5;

[0044] Step 2: Place the crucible outer sleeve 1 at the center of the induction coil 5 and make the crucible outer sleeve 1 and the induction coil 5 concentrically arranged;

[0045] Step 3: Fill the gap between the crucible jacket 1 and the induction coil 5 with filling sand 4 until the filling sand 4 is 50 mm away from the top of the induction coil 5;

[0046] Step 4: Continue to fill the gap between the crucible jacket 1 and the induction coil 5 with aluminosilicate fiber felt 7 until the aluminosilicate fiber felt 7 is flush with the top of the induction coil 5;

[0047] Step 5: Place the crucible inner lining 2 inside the crucible jacket 1 and make the crucible inner lining 2 concentric with the crucible jacket 1.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vacuum induction crucible melting furnace that can be quickly disassembled, characterized in that: It comprises a crucible outer shell (1), a crucible inner lining (2), an insulating cloth (3), filling sand (4), an induction coil (5), and an aluminum silicate fiber felt (7); A crucible lining (2) is mounted inside a crucible outer shell (1), an insulating cloth (3) is arranged outside the crucible outer shell (1), filling sand (4) is filled between the crucible outer shell (1) and the insulating cloth (3), an aluminum silicate fiber felt (7) is arranged between the crucible outer shell (1) and the insulating cloth (3) for compacting the filling sand (4), and an induction coil (5) is arranged outside the insulating cloth (3).

2. The quickly detachable vacuum induction crucible melting furnace according to claim 1, characterized in that: A convex block (6) is arranged on the outer side of the top end of the crucible jacket (1), and the convex block (6) presses the aluminum silicate fiber felt (7) downwards.

3. The quickly detachable vacuum induction crucible melting furnace according to claim 1, characterized in that: A gap of 1-2 mm is provided between the crucible outer shell (1) and the crucible lining (2).

4. The quickly detachable vacuum induction crucible melting furnace according to claim 1, characterized in that: The height of the aluminum silicate fiber felt (7) is 50 mm.

5. The quickly detachable vacuum induction crucible melting furnace according to claim 1, characterized in that: The thickness of the filling sand (4) is 20-45 mm.

6. The quickly detachable vacuum induction crucible melting furnace according to claim 1, characterized in that: The crucible jacket (1) is 10-15 mm higher than the induction coil (5).

7. The quickly detachable vacuum induction crucible melting furnace according to claim 1, characterized in that: The crucible lining (2) is 20-25 mm higher than the crucible outer shell (1).

8. The rapidly disassembled vacuum induction crucible melting furnace according to claim 1, characterized in that: The filling sand (4) is selected from 1-4 mm fused magnesia sand.

9. The quickly detachable vacuum induction crucible melting furnace according to claim 8, characterized in that: The specification and ratio of the filling sand (4) are 0-1mm:1-2mm:2-4mm=1:2:

1.

10. A method for assembling a melting furnace of a quickly detachable vacuum induction crucible melting furnace according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Wrap the insulating cloth (3) inside the induction coil (5); Step 2: placing the crucible outer shell (1) at the center of the induction coil (5), and arranging the crucible outer shell (1) and the induction coil (5) concentrically; Step 3: Filling the space between the crucible jacket (1) and the induction coil (5) with filling sand (4) until the filling sand (4) is 50 mm away from the top of the induction coil (5); Step 4: Continue to fill the gap between the crucible jacket (1) and the induction coil (5) with the aluminum silicate fiber felt (7) until the aluminum silicate fiber felt (7) is flush with the top of the induction coil (5); Step 5: placing the crucible lining (2) in the crucible outer shell (1), and arranging the crucible lining (2) and the crucible outer shell (1) concentrically.

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