Air tightness detection tool for belly pipe of blast furnace

Abstract

The utility model belongs to the technical field of blast furnace air supply systems, and relates to a blast furnace belly pipe air tightness detection tool, which comprises a belly pipe assembly, an airtight end cover connected to the front end of the belly pipe assembly, a small cover insertion plate arranged on the front section of the airtight end cover, a screw head arranged on the small cover insertion plate, an air inlet pipe connected with the screw head, and an air inlet valve arranged on the air inlet pipe. The air inlet pipe is connected with a metal hose through a quick connector, the other end of the metal hose is connected to a compressed air pipe network, and a ball valve is mounted at the joint of the metal hose and the compressed air pipe network. The device effectively detects whether tuyere equipment is installed in place or not, avoids repeated damping down of the blast furnace, and ensures normal production of the blast furnace.

Description

Technical Field

[0001] This utility model belongs to the technical field of blast furnace air supply system, specifically relating to a tool for testing the air tightness of blast furnace direct blowing pipe. Background Technology

[0002] The tuyere plays a crucial role in the ironmaking process by blowing high-temperature hot air into the furnace. Damaged tuyere direct-blowing pipes and their sleeves, or those that have been used for a certain period, require mandatory periodic replacement, typically scheduled during maintenance. The rear end of the sleeve is fitted onto the front end of the direct-blowing pipe, while the middle sleeve is fitted over the small sleeve. A snap-fit ​​structure connects the two sleeves. Since both the small and middle sleeves are made of copper and have high thermal expansion, leaks between them are generally prevented. The main inspection point is the gap between the direct-blowing pipe and the small sleeve.

[0003] During maintenance, the tuyeres are blocked with taphole clay, and then the tuyeres equipment is replaced. After the tuyeres equipment is replaced, the taphole clay is removed from the inside of the direct blow pipe, and then the blast furnace is restarted. If the direct blow pipe is leaking at the small sleeve contact surface after restarting the blast furnace, the blast furnace needs to be shut down for adjustment and installation. Restarting and shutting down the blast furnace will cause a large number of equipment to be started and stopped, which is time-consuming and labor-intensive and will cause considerable losses.

[0004] Therefore, a tool for testing the airtightness of blast furnace direct-blowing pipes is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a tool for testing the airtightness of blast furnace direct-blowing pipes, which solves the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a blast furnace direct-blowing pipe airtightness testing tool, including a direct-blowing pipe assembly, an airtight end cap connected to the front end of the direct-blowing pipe assembly, a small cover plate provided on the front section of the airtight end cap, the small cover plate being fitted with a threaded end, the threaded end being connected to an air inlet pipe, an air inlet valve being provided on the air inlet pipe, the air inlet pipe being connected to a metal hose through a quick connector, the other end of the metal hose being connected to a compressed air pipeline network, and a ball valve being installed at the connection between the metal hose and the compressed air pipeline network.

[0007] Preferably, the air intake pipe is a rigid air source pipe, which passes through the inner surface of the airtight end cap and communicates with the inside of the direct blow pipe assembly.

[0008] Preferably, the intake pipe is provided with a quick-connect female end and the metal hose is provided with a quick-connect male end, and the quick-connect female end and quick-connect male end are connected to each other.

[0009] Preferably, the contact surface between the airtight end cap and the direct-blowing pipe assembly is provided with a sealing gasket.

[0010] Preferably, a pressure gauge is installed on the intake pipe, and the pressure gauge is located between the intake valve and the quick connector.

[0011] Preferably, the small cover plate and the airtight end cover are fastened together by flange bolts.

[0012] Preferably, a safety relief valve is installed on the metal hose near the ball valve.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] This invention effectively detects whether the tuyeres are installed correctly, avoiding repeated shutdowns of the blast furnace and ensuring normal production. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a blast furnace direct-blowing pipe airtightness testing tool according to one embodiment;

[0017] In the above diagram, 1. Direct blow pipe assembly, 2. Airtight end cap, 3. Small cover insert plate, 4. Threaded end, 5. Air inlet pipe, 6. Air inlet valve, 7. Quick connector, 8. Metal hose, 9. Ball valve, 10. Pressure gauge, 11. Safety relief valve. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example 1, such as Figure 1As shown, a blast furnace direct-fired pipe airtightness testing tool includes a direct-fired pipe assembly 1, which is the object to be tested. The tool is installed at the front end to test the direct-fired pipe assembly 1. An airtight end cap 2 is connected to the front end of the direct-fired pipe assembly 1. The airtight end cap 2 provides a closed cavity covering the interface area between the direct-fired pipe and the small sleeve, and also serves as a mounting base for other components, facilitating quick installation and testing after maintenance or replacement of the tuyeres. A small cover plate 3 is provided on the front section of the airtight end cap 2, corresponding to the position of the tuyeres inspection hole, providing a channel and fixing point for installation and operation. The opening in the small cover plate 3 allows the air inlet pipe 5 to pass through.

[0021] The small cover plate 3 is equipped with a threaded end 4, which is a threaded connector. One end is screwed into the threaded hole of the small cover plate 3 for fixation, and the other end is used to connect to the air inlet pipe 5. The threaded end 4 facilitates the installation and fixation of the air inlet pipe 5, ensuring connection strength and airtightness. An air inlet valve 6 is provided on the air inlet pipe 5. The air inlet valve 6 is used to control the flow of compressed air into the test chamber. During testing, the air inlet is opened, and after reaching the required pressure, it is closed for pressure holding testing. This allows the operator to control the pressurization process. After closing, the air source is isolated, and the test chamber enters a pressure holding state to observe pressure changes and determine leakage.

[0022] The air inlet pipe 5 is connected to the metal hose 8 via a quick connector 7. The quick connector 7 enables quick and reliable connection and disconnection between the air inlet pipe 5 and the metal hose 8, significantly improving the speed of connecting and disconnecting the air source and saving maintenance time. The standard quick connector 7 ensures airtightness after connection, and the air source can be quickly disconnected after testing, facilitating tool disassembly and storage. The metal hose 8 transports compressed air and, as a flexible part of the air source pipeline, adapts to the complex and potentially confined space environment of the blast furnace site, facilitating tool placement and operation. The metal material can withstand the pressure of compressed air and the possible high-temperature radiation on site, making it more wear-resistant and aging-resistant than ordinary rubber hoses.

[0023] The other end of the metal hose 8 is connected to the compressed air pipeline network, and a ball valve 9 is installed at the connection between the metal hose 8 and the compressed air pipeline network. The ball valve 9 serves as the main switch for the metal hose 8 to access the pipeline network. It is usually closed before connecting the metal hose 8, which facilitates the safe cutting off or opening of the air source when connecting and disconnecting the hose, preventing gas from being ejected due to misoperation. The ball valve 9 opens and closes quickly and has good sealing performance.

[0024] After the direct-blowing pipe and vent sleeve of the air outlet equipment are installed and before the slurry is removed and ventilation is resumed, compressed air is applied to the sealed interface area of ​​the direct-blowing pipe and vent sleeve and the pressure is maintained. The pressure is then checked to see if it drops steadily, thus determining whether this critical sealing surface is properly installed and whether there are any leaks. This avoids the huge losses caused by repeated ventilation shutdowns that traditional methods require re-ventilation to detect leaks.

[0025] The specific design of the aforementioned key components will be discussed in detail below:

[0026] The intake pipe 5 is a rigid air source pipe, which passes through the inner surface of the airtight end cap 2 and connects to the inside of the direct-blowing pipe assembly 1. The rigid pipe structure offers good rigidity, facilitating the fixing and operation of valves and instruments in confined spaces. It is not prone to shaking, has high stability, and its direct connection ensures that compressed air smoothly enters the test area. The intake pipe 5 passes through the airtight end cap 2 and the small cover insert 3, introducing compressed air from an external air source into the closed test chamber formed by the airtight end cap 2, the front end of the direct-blowing pipe, and the rear end of the installed small sleeve. The intake pipe 5 also serves as the pipeline for installing the intake valve 6 and the pressure gauge 10.

[0027] The intake pipe 5 is equipped with a female quick connector 7 at one end, and the metal hose 8 is equipped with a male quick connector 7 at one end. The female and male quick connectors 7 are connected to each other. As a static part, the intake pipe 5 needs to provide a stable and reliable interface at its end. The metal hose 8 connects to the external compressed air network and the testing tool, and is a moving part that needs to be frequently plugged and unplugged. The air source needs to be connected and disconnected before and after each test, which conforms to the industrial standard connector configuration.

[0028] The contact surface between the airtight end cap 2 and the straight blow pipe assembly 1 is provided with a sealing gasket to ensure a reliable seal between the airtight end cap 2 and the front flange face of the straight blow pipe assembly 1, prevent compressed air from leaking from here, ensure the accuracy of test results, improve sealing reliability, ensure that the test results truly reflect the sealing condition of the straight blow pipe and the small sleeve, and standardize and make it easy to replace.

[0029] A pressure gauge 10 is installed on the air inlet pipe 5, located between the air inlet valve 6 and the quick connector 7. The pressure gauge 10 displays the gas pressure value in the test chamber in real time, directly providing a criterion for leakage. During the pressure holding period, observing whether the pressure gauge 10 reading decreases and the rate of decrease allows for the determination of whether there is a leak at the direct blow pipe-small sleeve interface and the extent of the leak. Operators can directly read the pressure value, making the judgment convenient.

[0030] The small cover plate 3 and the airtight end cover 2 are fastened together by flange bolts. The bolt connection firmly fixes the small cover plate 3 to the airtight end cover 2, which facilitates the installation and disassembly of the air intake pipe 5 assembly. The flange bolt connection can provide sufficient and uniform clamping force to ensure the seal between the small cover plate 3 and the airtight end cover 2.

[0031] A safety pressure relief valve 11 is installed on the metal hose 8 near the ball valve 9. The safety pressure relief valve 11 automatically opens to release pressure when the pressure in the pipeline or test chamber unexpectedly exceeds the set safety value, protecting the pipeline, tools and personnel safety, preventing overpressure caused by misoperation or other reasons. It is a safety redundancy design that protects the testing tools and air outlet equipment from excessive pressure impact.

[0032] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A tool for testing the airtightness of a blast furnace direct-fired pipe, comprising a direct-fired pipe assembly, an airtight end cap connected to the front end of the direct-fired pipe assembly, and a small cover plate provided on the front section of the airtight end cap, characterized in that, The small cover plate is fitted with a threaded end, which is connected to the air inlet pipe. The air inlet pipe is equipped with an air inlet valve. The air inlet pipe is connected to a metal hose via a quick connector. The other end of the metal hose is connected to the compressed air network. A ball valve is installed at the connection between the metal hose and the compressed air network.

2. The blast furnace direct-blown pipe airtightness testing tool according to claim 1, characterized in that, The air intake pipe is a rigid air source pipe that passes through the inner surface of the airtight end cap and connects to the inside of the direct blow pipe assembly.

3. The blast furnace direct-blowing pipe airtightness testing tool according to claim 1, characterized in that, The intake pipe is equipped with a quick-connect female end, and the metal hose is equipped with a quick-connect male end. The quick-connect female end and the quick-connect male end are connected to each other.

4. The blast furnace direct-blowing pipe airtightness testing tool according to claim 1, characterized in that, The contact surface between the airtight end cap and the direct blow pipe assembly is provided with a sealing gasket.

5. The blast furnace direct-blowing pipe airtightness testing tool according to claim 1, characterized in that, A pressure gauge is installed on the intake pipe, and the pressure gauge is located between the intake valve and the quick connector.

6. The blast furnace direct-blowing pipe airtightness testing tool according to claim 1, characterized in that, The small cover plate and the airtight end cover are fastened together by flange bolts.

7. The blast furnace direct-blowing pipe airtightness testing tool according to claim 1, characterized in that, A safety relief valve is installed on the metal hose near the ball valve.

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