Furnace roller sealing performance detection structure and method thereof

Abstract

The invention discloses a furnace roller sealing performance detection structure and method, and belongs to the technical field of furnace roller sealing. The furnace comprises a furnace body and a furnace roller, a protective cover is arranged at the joint of the furnace body and the furnace roller, and an oxygen content detector is arranged in the protective cover; a communicating hose is further arranged in the protective cover, and one end of the communicating hose is connected with a high-pressure nitrogen storage device; and an electromagnetic valve is arranged on a pipeline communicated with the hose. The protective cover and the furnace body are connected in a welding mode, the protective cover is of a two-piece structure and is convenient to disassemble and assemble, the air tightness of the connecting gap is high, gaps are few, and the isolation effect is excellent; the protective cover physically isolates the position, prone to leakage, of the furnace roller neck from the outside, and the isolation performance is better; a plurality of groups of sealing blades are additionally arranged in the protective cover, and when the air pressure in the furnace is too high, the ends, close to the furnace roller, of the sealing blades are opened outwards, so that the pressure is released, and external air is difficult to enter the sealing blades; and the risk that external gas enters the furnace is reduced.

Description

Technical Field

[0001] This invention relates to the field of furnace roller sealing technology, and more specifically, to a furnace roller sealing performance testing structure and method. Background Technology

[0002] In the continuous strip annealing process, the furnace rollers of the annealing furnace, as the core component for strip conveying, directly determine the stability of the protective atmosphere (such as a nitrogen-hydrogen mixture), the surface quality of the strip, and energy utilization efficiency through their sealing with the furnace body. This is a crucial factor affecting the continuity of the annealing process and the product qualification rate. Figure 4 As shown in the figure, 1 is the furnace body of the annealing furnace, 2 is the exposed furnace roller, and 3 is the roller neck. Due to prolonged heating, poor sealing is likely to occur at point 3, causing air to enter the annealing furnace from point 3 and resulting in quality problems.

[0003] Currently, the sealing structure between the furnace rollers and the furnace body in annealing furnaces mainly relies on traditional methods such as labyrinth seals, graphite packing seals, or rubber sealing rings. However, in actual long-term operation, the above-mentioned sealing solutions generally face insurmountable technical bottlenecks, which have become prominent pain points restricting the annealing production of steel and non-ferrous metals.

[0004] The defects of existing sealing structures are mainly reflected in the following aspects: First, insufficient high-temperature adaptability. The working temperature of annealing furnaces is usually maintained at 400-900℃. Traditional rubber sealing rings are prone to carbonization, hardening, or elastic failure in this temperature range. Although graphite fillers have a certain degree of high-temperature resistance, they are easily worn, thinned, and powdered due to long-term friction from the rotation of furnace rollers and scouring by airflow inside the furnace. This leads to a continuous expansion of the sealing gap, a decrease in the purity of the furnace atmosphere, and quality problems such as oxidation and decarburization on the surface of the strip steel. Second, poor coordination between sealing and movement. During operation, furnace rollers must withstand radial runout (due to bearing wear) and axial movement (due to thermal expansion and contraction). Traditional sealing structures are mostly designed with fixed gaps, which are difficult to adapt to the dynamic displacement of the furnace rollers. If the gap of the labyrinth seal is designed too small, the sealing teeth are easily scratched by friction between the sealing teeth and the roller shaft due to the movement of the furnace rollers, which aggravates equipment wear. If the gap is designed too large, the initial sealing effect will not meet the requirements. Although the sealing pressure of graphite packing seals can be adjusted by the gland, frequent adjustment can easily lead to uneven packing compression, resulting in local "leakage". Moreover, the adjustment process requires machine shutdown, which seriously affects the continuity of production.

[0005] To address the aforementioned technical issues, the current solution involves using manual measuring equipment to detect leaks in areas prone to leakage, followed by repairing the leaks with metal adhesive. This solution is inefficient and lacks timeliness, exhibiting a certain degree of lag. By the time a defect is detected and the leak point is discovered, a certain number of defective products have already been produced, resulting in quality losses. Summary of the Invention

[0006] 1. Technical problems solved by the invention

[0007] In view of the defects and shortcomings of the prior art, the present application provides a furnace roller sealing detection structure and method, which connects the protective cover and the furnace body by welding, the protective cover has a two-piece structure, which is convenient to disassemble and install, has strong air tightness at the joint gap, small gap and excellent isolation effect; the protective cover physically isolates the position prone to leakage of the furnace roller neck from the outside, and has better isolation; a plurality of sealing vanes are arranged inside the protective cover, when the gas pressure in the furnace is too large, one end of the sealing vane near the furnace roller opens outward, thereby releasing the pressure, so that external gas is difficult to enter the inside of the sealing vane.

[0008] 2. Technical solutions

[0009] To achieve the above-mentioned purpose, the technical solutions provided by the present application are as follows:

[0010] The furnace roller sealing detection structure of the present application comprises a furnace body and a furnace roller, a protective cover is arranged at the connection between the furnace body and the furnace roller, and an oxygen content detector is arranged in the protective cover.

[0011] The inside of the protective cover is further provided with a communication hose, one end of the communication hose extends into the protective cover, the other end of the communication hose is connected with a high-pressure nitrogen gas storage device, and an electromagnetic valve is arranged on the pipeline of the communication hose.

[0012] Further, the connection between the furnace body and the furnace roller is the furnace roller neck.

[0013] Further, the protective cover is welded with the furnace body.

[0014] Further, the protective cover is divided into left and right two pieces, and the two pieces of protective cover form a hemispherical body after being combined, the middle part of the hemispherical body is provided with an opening, and one end of the furnace roller extends out of the opening.

[0015] Further, a sealing vane is arranged in the protective cover, the sealing vane is arranged in multiple groups and uniformly distributed in the outer circle of the furnace roller in the form of an annular array.

[0016] Further, the sealing vane has elasticity, and one end of the sealing vane away from the furnace roller is fixed relative to the surface of the furnace body.

[0017] The method for detecting the sealing property of a furnace roller, the oxygen content detector monitors the oxygen content in the sealing vane in real time, when the oxygen content detector detects that the oxygen content in the internal cavity of the sealing vane exceeds the set upper limit, the electromagnetic valve is automatically opened, nitrogen gas is injected into the cavity through the communication hose, and the nitrogen gas acts as a sealing gas to isolate the oxygen from entering the internal cavity of the sealing vane.

[0018] 3. Advantages

[0019] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0020] The protective cover is connected with the furnace body by welding, and the protective cover has a two-piece structure, which is convenient to disassemble and install, has strong air tightness at the connecting gap, small gap, and excellent isolation effect; the protective cover physically isolates the position prone to leakage of the furnace roll neck from the outside, and has better isolation;

[0021] The protective cover is connected with the furnace body by welding, and the protective cover has a two-piece structure, which is convenient to disassemble and install, has strong air tightness at the connecting gap, small gap, and excellent isolation effect; the protective cover physically isolates the position prone to leakage of the furnace roll neck from the outside, and has better isolation;

[0022] At the same time, when the oxygen content detector detects that the oxygen content in the internal cavity of the sealing blade exceeds the set upper limit, the electromagnetic valve is automatically opened, nitrogen gas is injected into the cavity through the communication hose, the nitrogen gas acts as a sealing gas to isolate the oxygen from entering the internal cavity of the sealing blade, and the gas is used for secondary sealing treatment to reduce the risk of external gas entering the furnace. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the overall structural diagram of the present application;

[0024] Figure 2 is the installation effect diagram of the sealing blade of the present application;

[0025] Figure 3 is the plan view of the protective cover of the present application;

[0026] Figure 4 is the background technology structure diagram of the present application.

[0027] In the figure: 1, furnace body; 2, furnace roll; 3, furnace roll neck; 4, protective cover; 5, oxygen content detector; 6, communication hose; 7, electromagnetic valve; 8, high-pressure nitrogen gas storage device; 9, sealing blade. DETAILED DESCRIPTION

[0028] The present application will be further described below in combination with the drawings and examples:

[0029] Example 1

[0030] From Figures 1-3 It can be seen that the sealing detection structure of the furnace roll of the present embodiment comprises a furnace body 1 and a furnace roll 2, and the connecting part of the furnace body 1 and the furnace roll 2 is a furnace roll neck 3; a protective cover 4 is arranged at the connecting part of the furnace body 1 and the furnace roll 2;

[0031] The protective cover 4 physically isolates the position prone to leakage of the furnace roll neck 3 from the outside, and the protective cover 4 can be connected with the furnace body 1 by welding, and has better isolation;

[0032] An oxygen content detector 5 is installed inside the protective cover 4; the oxygen content detector 5 detects the oxygen content and provides a data source for the subsequent automatic processing system.

[0033] The protective cover 4 is also equipped with a connecting hose 6. One end of the connecting hose 6 extends into the protective cover 4, and the other end of the connecting hose 6 is connected to a high-pressure nitrogen storage device 8. A solenoid valve 7 is installed on the connecting hose 6.

[0034] Nitrogen is connected to the furnace through the connecting hose 6 and the high-pressure nitrogen storage device 8, and the gas is used for secondary "sealing" to reduce the risk of external gas entering the furnace.

[0035] Solenoid valve 7 is used to control the "input" and "flow" of nitrogen;

[0036] The high-pressure nitrogen storage device 8 serves as a nitrogen storage device. Nitrogen, as an "inert" gas, does not react with the strip steel in the furnace and can play an isolation role.

[0037] The protective cover 4 is welded to the furnace body 1. The protective cover 4 is divided into two pieces, left and right. The two protective covers are combined to form a hemisphere. An opening is made in the middle of the hemisphere. One end of the furnace roller 2 extends out from the opening. The protective cover 4 covers the neck 3 of the furnace roller.

[0038] The protective cover 4 has a two-piece structure, which is easy to disassemble and install. The joints are airtight with few gaps, resulting in excellent isolation.

[0039] Example 2

[0040] from Figures 1-3 As can be seen, in this embodiment of the furnace roller sealing detection structure, the protective cover 4 is provided with sealing blades 9, and multiple sets of sealing blades 9 are provided and are evenly distributed on the outer ring of the furnace roller 2 in the form of a ring array.

[0041] The sealing blade 9 is elastic, and the end of the sealing blade 9 away from the furnace roller 2 is fixed relative to the surface of the furnace body 1.

[0042] Multiple sets of sealing blades 9 are added inside the protective cover 4. The end of the sealing blade 9 away from the furnace roller 2 can be fixed to the surface of the furnace body 1 or to the outer edge of the protective cover 4. When the gas pressure inside the furnace is too high, the end of the sealing blade 9 near the furnace roller 2 opens outward to release the pressure, and it is difficult for external gas to enter the interior of the sealing blade 9.

[0043] The sealing blade 9 is equivalent to achieving a secondary sealing effect within the protective cover 4.

[0044] Example 3

[0045] from Figures 1-3As can be seen, in the method of using the furnace roller sealing detection structure of this embodiment, the oxygen content detector 5 monitors the oxygen content inside the sealing blade 9 in real time. When the oxygen content detector 5 detects that the oxygen content inside the cavity of the sealing blade 9 exceeds the set upper limit, the solenoid valve 7 automatically opens and injects nitrogen into the cavity through the connecting hose 6. The nitrogen acts as a sealing gas to prevent oxygen from entering the internal cavity of the sealing blade 9.

[0046] By setting different programs, the opening degree of solenoid valve 7 can be controlled under different oxygen concentrations. When the oxygen content exceeds the standard by a small amount, the flow rate of nitrogen gas is small, and when the oxygen content exceeds the standard by a large amount, the flow rate of nitrogen gas is large. This control program can effectively reduce nitrogen consumption, save costs, improve the shortcomings of existing devices, reduce the degree of manual intervention, and realize automated control.

[0047] The present invention connects the protective cover 4 to the furnace body 1 by welding. The protective cover 4 has a two-piece structure, which is easy to disassemble and install. The connection seam has strong airtightness, few gaps, and excellent isolation effect. The protective cover 4 physically isolates the furnace roller neck 3, which is prone to leakage, from the outside world, and the isolation is better.

[0048] Multiple sets of sealing blades 9 are added inside the protective cover 4. When the gas pressure inside the furnace is too high, the end of the sealing blade 9 near the furnace roller 2 opens outward to release the pressure, making it difficult for external gas to enter the interior of the sealing blade 9.

[0049] At the same time, when the oxygen content detector 5 detects that the oxygen content in the internal cavity of the sealing blade 9 exceeds the set upper limit, the solenoid valve 7 automatically opens and injects nitrogen into the cavity through the connecting hose 6. The nitrogen acts as a sealing gas to prevent oxygen from entering the internal cavity of the sealing blade 9, and the gas is used for secondary sealing to reduce the risk of external gas entering the furnace.

[0050] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A structure for detecting the tightness of a furnace roller, comprising a furnace body (1) and a furnace roller (2), characterized in that: The connecting part of the furnace body (1) and the furnace roller (2) is provided with a protective cover (4), and the protective cover (4) is provided with an oxygen content detector (5) inside. The protective cover (4) is further provided with a communication hose (6) inside, one end of the communication hose (6) extends into the protective cover (4), the other end of the communication hose (6) is connected with a high-pressure nitrogen storage device (8), and an electromagnetic valve (7) is arranged on the pipeline of the communication hose (6).

2. The furnace roller leak detection structure according to claim 1, characterized in that: The connecting part of the furnace body (1) and the furnace roller (2) is a furnace roller neck (3).

3. The furnace roller sealability detection structure according to claim 1, characterized in that: The protective cover (4) is welded with the furnace body (1).

4. The furnace roller leak detection structure according to claim 1, characterized by: The protective cover (4) is divided into two pieces, and the two pieces of the protective cover (4) are combined to form a hemisphere, the middle part of the hemisphere is provided with an opening, and one end of the furnace roller (2) extends out of the opening.

5. The furnace roller leak detection structure according to claim 1, wherein: The protective cover (4) is provided with sealing blades (9) inside, the sealing blades (9) are provided with multiple groups and are uniformly distributed in the form of an annular array outside the furnace roller (2).

6. The furnace roller leak detection structure according to claim 5, wherein: The sealing blades (9) are elastic, and one end of the sealing blades (9) away from the furnace roller (2) is fixed relative to the surface of the furnace body (1).

7. The method of claim 6, wherein: The oxygen content detector (5) monitors the oxygen content in the sealing blades (9) in real time, when the oxygen content detector (5) detects that the oxygen content in the internal cavity of the sealing blades (9) exceeds the set upper limit, the electromagnetic valve (7) is automatically opened, nitrogen is injected into the cavity through the communication hose (6), and the nitrogen is used as sealing gas to isolate the oxygen from entering the internal cavity of the sealing blades (9).

Images