Sealing device for inspection manhole door of silicon steel continuous annealing furnace

Abstract

A sealing device for an inspection manhole door of a silicon steel continuous annealing furnace comprises a rectangular annular outer seal and a rectangular annular closed inner seal, the rectangular annular outer seal comprises a furnace door steel cover plate, an outer sealing ring, a bolt connection combination and a furnace door frame, the furnace inner side face of the furnace door steel cover plate is machined into a rectangular groove, and the outer sealing ring is embedded into the rectangular groove. The furnace door frame is welded on the furnace shell, and the bolt connection combination is connected with the furnace door steel cover plate and the furnace door frame to tightly press the outer sealing ring to form a rectangular annular outer seal; the rectangular annular sealing inner seal comprises a rectangular annular sealing groove, an inner sealing ring and a rectangular annular sealing convex strip, the rectangular annular sealing groove is welded to the periphery of the furnace inner side face of the furnace door frame and is closed by a circle, the rectangular annular sealing groove is filled with the inner sealing ring, the rectangular annular sealing convex strip is welded to the furnace inner side of the furnace door steel cover plate, and the rectangular annular sealing convex strip is welded to the furnace inner side of the furnace door steel cover plate. And the rectangular annular sealing convex strip extrudes the inner sealing ring and the rectangular annular sealing groove to form a rectangular annular sealing inner seal. The sealing effect of the inspection manhole door of the silicon steel continuous annealing furnace is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon steel continuous annealing furnaces, in particular to a sealing device for a maintenance manhole door of a silicon steel continuous annealing furnace. Background Art

[0002] The airtightness of the protective gas circulation jet cooler (RJC) section in a silicon steel continuous annealing furnace directly impacts product performance and surface quality. Therefore, the RJC's airtightness requirements are very high, and the sealing of the inspection manhole door is a weak link. The existing inspection manhole door seal uses a bolted connection assembly to connect the furnace door steel cover plate to the furnace door frame, which compresses a heat-resistant ceramic fiber sealing rope to form a seal. This seal is less reliable, and the ceramic fiber sealing rope used has poor airtightness. Each inspection manhole door has 18 bolted connections, which make it difficult to achieve uniformity and stability at each point during the planar press fit between the furnace door steel cover plate and the furnace door frame. Therefore, after sealing the furnace door steel cover plate after regular maintenance or abnormal belt breakage, a pressurized leak test is required before resuming production. This means that a process called furnace door cover leak detection, which involves pressurizing the furnace to check for leaks in the manhole door, is required. Adjustments such as bolt joint balancing and tightening are made based on the leak detection results. It may even be necessary to replace ceramic fiber sealing ropes or use heat-resistant sealant. Each furnace door cover leak detection process takes more than an hour. Rubber seals with better sealing properties were used instead, but they cannot withstand high temperatures for long periods of time. Summary of the Invention

[0003] In order to solve the above technical problems, the utility model provides a sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace, which effectively improves the airtightness of the furnace door cover and the reliability and stability of the seal, and can improve the accuracy and convenience of the door sealing operation.

[0004] The technical solution further defined in the utility model is: a sealing device for a manhole door of a silicon steel continuous annealing furnace, comprising:

[0005] A rectangular annular outer seal comprises a furnace door steel cover plate, an outer sealing ring, a bolt connection assembly, and a furnace door frame. The furnace door steel cover plate has a rectangular groove machined on its inner side surface and is embedded with the outer sealing ring. The furnace door frame is welded to the furnace shell. The bolt connection assembly connects the furnace door steel cover plate and the furnace door frame to compress the outer sealing ring to form a rectangular annular outer seal.

[0006] The rectangular annular tight-fitting inner seal comprises a rectangular annular tight-fitting groove, an inner sealing ring and a rectangular annular tight-fitting convex strip. The rectangular annular tight-fitting groove is welded to the inner side of the furnace door frame to form a closed circle; the inner sealing ring is filled in the rectangular annular tight-fitting groove; the rectangular annular tight-fitting convex strip is welded to the inner side of the furnace door steel cover to form a closure. The position of the rectangular annular tight-fitting convex strip is corresponding to the rectangular annular tight-fitting groove. When the furnace door is closed, the rectangular annular tight-fitting convex strip squeezes the inner sealing ring and the rectangular annular tight-fitting groove to form a tight fit, thereby forming a rectangular annular tight-fitting inner seal.

[0007] Furthermore, the inner side of the furnace door steel cover plate is provided with a furnace door steel cover plate refractory material and a furnace door steel cover plate refractory material lining plate, and the furnace door steel cover plate refractory material is fastened to the furnace door steel cover plate by furnace door steel cover plate refractory material anchoring nails, and the furnace door steel cover plate refractory material anchoring nails are welded to the inner side of the furnace door steel cover plate.

[0008] Furthermore, the rectangular groove processed on the inner side surface of the furnace door steel cover is a semicircular groove with a diameter of 8 mm. The rectangular groove is 674 mm long and 584 mm wide, and is embedded with an outer sealing ring of corresponding size to form a tight fit.

[0009] Furthermore, the outer sealing ring is a fluororubber sealing ring.

[0010] Furthermore, the bolt connection combination is composed of bolts, nuts, spring washers and square washers for channel steel.

[0011] Furthermore, the shape of the inner side of the furnace door frame is rectangular, 640 mm long and 550 mm wide.

[0012] Furthermore, the rectangular annular sealing groove is a groove formed by welding a U-shaped cold-bent steel with a height of 30 mm and a thickness of 5 mm on both sides to the furnace inner side surface of the furnace door frame to form a closed circle.

[0013] Furthermore, the rectangular annular close-fitting convex strip is welded to the inner side of the furnace door using a steel bar with a height of 20 mm and a thickness of 5 mm, forming a rectangular continuous convex strip with a length of 650 mm and a width of 560 mm.

[0014] Furthermore, when the rectangular annular sealing ridge is pressed into the inner sealing ring filled in the rectangular annular sealing groove, the pressing depth is 10 mm.

[0015] Furthermore, the rectangular annular sealing ridge and the rectangular annular sealing groove are both made of 1Cr18Ni9Ti, and the inner sealing ring is made of silicon titanium fireproof cloth and fine heat-resistant steel wire.

[0016] The beneficial effects of the utility model are:

[0017] (1) The bolt connection assembly connects the furnace door steel cover plate to the furnace door frame and compresses the outer sealing ring to form a rectangular annular outer seal. When the furnace door is closed, the rectangular annular sealing rib is squeezed on the inner sealing ring and forms a seal with the rectangular annular sealing groove, forming a rectangular annular sealing inner seal. The sealing effect of the RJC maintenance manhole door is significantly improved. The oxygen content has not been detected to exceed the standard and remains stable. There is no problem of product surface oxidation caused by RJC, and the product quality indicators are significantly improved.

[0018] (2) The furnace door cover leak detection process was omitted, and the operation time of closing the RJC maintenance manhole door was greatly reduced, which increased production time, effectively improved the product qualification rate and the unit operation rate, and created better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of a sealing device for a maintenance manhole door of a silicon steel continuous annealing furnace.

[0020] Figure 2 The utility model is a schematic diagram of the internal structure of a sealing device for a maintenance manhole door of a silicon steel continuous annealing furnace after the furnace door is removed.

[0021] Figure 3 This utility model is a sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace Figure 1 AA direction cross-section.

[0022] Figure 4 This utility model is a sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace Figure 3 Enlarged view of point I.

[0023] Among them: 1. Furnace door steel cover, 2. Furnace door steel cover refractory anchor nails, 3. Furnace door steel cover refractory, 4. Furnace door steel cover refractory lining, 5. Ceramic fiber sealing rope, 6. Bolt connection combination, 7. Furnace door frame, 8. Furnace shell, 9. Furnace wall refractory material, 10. Furnace wall refractory lining, 11. Rectangular annular sealing ridge, 12. Rectangular annular sealing groove, 13. Inner sealing ring, 14. Outer sealing ring. DETAILED DESCRIPTION

[0024] This embodiment provides a sealing device for a manhole door of a silicon steel continuous annealing furnace, the structure of which is as follows: Figures 1-4As shown, it includes a rectangular annular outer seal and a rectangular annular tight inner seal. The rectangular annular outer seal includes a furnace door steel cover plate 1, an outer sealing ring 14, a bolt connection assembly 6, and a furnace door frame 7. A rectangular groove is processed on the inner side of the furnace door steel cover plate 1 and embedded with the outer sealing ring 14. The furnace door frame 7 is welded to the furnace shell 8. The bolt connection assembly 6 connects the furnace door steel cover plate 1 and the furnace door frame 7 and presses the outer sealing ring 14 to form a rectangular annular outer seal; the rectangular annular tight inner seal includes a rectangular annular tight groove 12, an inner sealing ring 13, a rectangular annular tight groove 14, an inner sealing ring 14, and a rectangular annular tight groove 12. The rectangular annular sealing ridge 11 and the rectangular annular sealing groove 12 are welded around the furnace inner side of the furnace door frame 7 to form a closed circle. The inner sealing ring 13 is filled in the rectangular annular sealing groove 12. The rectangular annular sealing ridge 11 is welded to the furnace inner side of the furnace door steel cover 1 to form a closed shape. The rectangular annular sealing ridge 11 is positioned to correspond to the rectangular annular sealing groove 12. When the furnace door is closed, the rectangular annular sealing ridge 11 squeezes the inner sealing ring 13 and forms a seal with the rectangular annular sealing groove 12, forming a rectangular annular sealing inner seal. The rectangular annular outer seal and the rectangular annular sealing inner seal work together to achieve a significant sealing effect on the maintenance manhole door of the silicon steel continuous annealing furnace. The RJC oxygen content has not been detected to exceed the standard and remains stable. There is no problem of surface oxidation of the product, and the product quality indicators are significantly improved.

[0025] like Figure 3 、 Figure 4 As shown, the inner side of the above-mentioned furnace door steel cover plate 1 is provided with a furnace door steel cover plate refractory material 3 and a furnace door steel cover plate refractory material lining plate 4. The furnace door steel cover plate refractory material 3 is fastened to the furnace door steel cover plate 1 through the furnace door steel cover plate refractory material anchoring nails 2. The furnace door steel cover plate refractory material anchoring nails 2 are welded to the inner side of the furnace door steel cover plate 1.

[0026] The rectangular groove processed on the inner side of the furnace door steel cover 1 is a semicircular groove with a diameter of 8 mm. The rectangular groove is 674 mm long and 584 mm wide, and is embedded with an outer sealing ring 14 of corresponding size to form a tight fit and not easy to fall off; the outer sealing ring 14 is a fluororubber sealing ring of customized size.

[0027] like Figure 1-4 As shown, the bolt connection assembly 6 is composed of bolts, nuts, spring washers and square washers for channel steel, and is used to connect the furnace door steel cover 1 with the furnace door frame 7.

[0028] The shape of the inner side of the furnace door frame 7 is rectangular, 640 mm long and 550 mm wide; the rectangular annular sealing groove 12 is a groove closed around the inner side of the furnace door frame 7 with a height of 30 mm and a thickness of 5 mm on both sides; the rectangular annular sealing ridge 11 is a 20 mm high and 5 mm thick steel bar welded to the inner side of the furnace door to form a rectangular continuous ridge with a length of 650 and a width of 560 mm; when the furnace door is closed, the rectangular annular sealing ridge 11 is pressed into the inner sealing ring 13 filled in the rectangular annular sealing groove 12, and the pressing depth is 10 mm; the rectangular annular sealing ridge 11 and the rectangular annular sealing groove 12 are both made of 1Cr18Ni9Ti, and the inner sealing ring 13 is made of silicon-titanium fireproof cloth and fine heat-resistant steel wire, which is elastic.

[0029] like Figure 3 、 Figure 4 As shown, furnace wall refractory material 9 and furnace wall refractory material lining plate 10 are arranged in the furnace shell 8.

[0030] The utility model omits the furnace door cover leak detection process, greatly reduces the operation time of closing the RJC maintenance manhole door, increases production time, effectively improves the product qualification rate and the unit operation rate, and creates better economic benefits.

[0031] In addition to the above embodiments, the present invention may also have other implementation methods; any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A sealing device for a manhole door of a silicon steel continuous annealing furnace, characterized in that: include: A rectangular annular outer seal, the rectangular annular outer seal comprising a furnace door steel cover plate (1), an outer sealing ring (14), a bolt connection assembly (6), and a furnace door frame (7); a rectangular groove is machined on the furnace inner side surface of the furnace door steel cover plate (1) and the outer sealing ring (14) is embedded therein; the furnace door frame (7) is welded to the furnace shell (8); the bolt connection assembly (6) connects the furnace door steel cover plate (1) and the furnace door frame (7) and compresses the outer sealing ring (14) to form a rectangular annular outer seal; A rectangular annular tight-fitting inner seal, wherein the rectangular annular tight-fitting inner seal comprises a rectangular annular tight-fitting groove (12), an inner sealing ring (13), and a rectangular annular tight-fitting convex strip (11). The rectangular annular tight-fitting groove (12) is welded to the furnace inner side surface of the furnace door frame (7) to form a closed circle. The inner sealing ring (13) is filled in the rectangular annular tight-fitting groove (12). The rectangular annular tight-fitting convex strip (11) is welded to the furnace inner side surface of the furnace door steel cover (1) to form a closed shape. The position of the rectangular annular tight-fitting convex strip (11) is set to correspond to the rectangular annular tight-fitting groove (12). When the furnace door is closed, the rectangular annular tight-fitting convex strip (11) squeezes the inner sealing ring (13) and forms a tight fit with the rectangular annular tight-fitting groove (12), thereby forming a rectangular annular tight-fitting inner seal.

2. The sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The furnace door steel cover plate (1) is provided with a furnace door steel cover plate refractory material (3) and a furnace door steel cover plate refractory material lining plate (4) on the inner side thereof. The furnace door steel cover plate refractory material (3) is fastened to the furnace door steel cover plate (1) by furnace door steel cover plate refractory material anchoring nails (2). The furnace door steel cover plate refractory material anchoring nails (2) are welded to the inner side of the furnace door steel cover plate (1).

3. The sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The rectangular groove processed on the inner side of the furnace door steel cover (1) has a cross-section of a semicircle with a diameter of 8 mm. The rectangular groove is 674 mm long and 584 mm wide, and is embedded with an outer sealing ring (14) of corresponding size to form a tight fit.

4. The sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The outer sealing ring (14) is a fluororubber sealing ring.

5. The sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The bolt connection assembly (6) is composed of bolts, nuts, spring washers and square washers for channel steel.

6. The sealing device for a manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The furnace door frame (7) has a rectangular shape on the inner side of the furnace, with a length of 640 mm and a width of 550 mm.

7. The sealing device for a manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The rectangular annular sealing groove (12) is a groove formed by welding a U-shaped cold-bent steel with a height of 30 mm on both sides and a thickness of 5 mm to the inner side of the furnace door frame (7) to form a closed circle.

8. The sealing device for a manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The rectangular ring-shaped close-fitting convex strip (11) is welded to the inner side of the furnace door using a steel strip with a height of 20 mm and a thickness of 5 mm, forming a rectangular continuous convex strip with a length of 650 mm and a width of 560 mm.

9. The sealing device for a silicon steel continuous annealing furnace maintenance manhole door according to claim 1, characterized in that: When the rectangular annular sealing convex strip (11) is pressed into the inner sealing ring (13) filled in the rectangular annular sealing groove (12), the pressing depth is 10 mm.

10. The sealing device for the maintenance manhole door of a silicon steel continuous annealing furnace according to claim 1, characterized in that: The rectangular annular sealing ridge (11) and the rectangular annular sealing groove (12) are both made of 1Cr18Ni9Ti, and the inner sealing ring (13) is made of silicon titanium fireproof cloth and fine heat-resistant steel wire.

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