Method for verifying service life of conducting strip in fireproof conductive hose
By standardizing the disassembly and assembly cycle and using precise torque control methods, the cumulative damage of the conductive sheet is quantified, which solves the problems of lack of standardization and structural reliability in conductive hose systems, and improves the service life of the conductive sheet and the reliability of the system.
Patent Information
- Application Number
- CN202511770808.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-03-03
AI Technical Summary
Existing fire-resistant conductive hose systems lack clear installation and operation procedures and service life assessment systems. The conductive sheets are prone to wear and structural fracture under combined stress, leading to functional failure and making it difficult to meet the long service life and high reliability requirements of the aerospace field.
By establishing a standardized disassembly and assembly cycle process, combined with precise torque control and structural condition monitoring, the damage accumulation of conductive sheets under combined stress is quantified until structural damage occurs, thus achieving an objective quantitative assessment of the service life of conductive sheets.
This enables an objective and quantitative assessment of the lifespan of conductive sheets, providing a reliable basis for product design and quality control. It also addresses the lack of standardization and structural reliability defects, thereby improving the lifespan of conductive sheets and the reliability of the system.
Smart Images
Figure CN121595358A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of rubber hose technology, and in particular to a method for verifying the service life of conductive sheets in a fire-resistant conductive hose. Background Technology
[0002] Currently, fire-resistant conductive flexible hose systems used in the domestic market employ a four-clamp torque-fixing structure, and the design length of the built-in conductive plate must meet the installation specification of ≥8mm. The connection mechanism of this system relies on corrugated metal connectors, achieving dual contact between the hose wall and the conductive plate through bidirectional insertion of the hose, supplemented by clamp tightening with a preset torque value to complete assembly. However, the current technology has the following key problems: 1) Lack of standardization: There is a lack of clear installation and operation procedures (including disassembly and assembly cycle thresholds) and a service life assessment system; 2) Structural reliability defects: Under the combined stress (external compressive load and internal friction and wear), the conductive sheet is prone to accelerated wear, which eventually leads to structural fracture. 3) Functional Failure: Loss of structural integrity of the conductive sheet will directly lead to the interruption of the continuity of the conductive medium in the hose, thereby causing systemic functional failure. This failure manifests as irreversible degradation of conductivity, ultimately causing the product to lose its designed function and prematurely exit the service life, significantly increasing the total life cycle cost.
[0003] Although existing technologies attempt to optimize the system through structural improvements or replacement of conductive sheets, they have not fundamentally solved the critical problem of insufficient conductive sheet lifespan leading to functional failure of the entire hose. This deficiency makes it difficult for existing solutions to meet the aerospace industry's requirements for long lifespan and high reliability of fire-resistant conductive rubber hoses. Summary of the Invention
[0004] This application aims to at least partially address one of the aforementioned technical problems in the prior art. To this end, embodiments of this application provide a method for verifying the service life of conductive sheets in fire-resistant conductive hoses. This method achieves an objective and quantitative assessment of the service life of the conductive sheets, providing a reliable basis for product design and quality control, and effectively solving problems such as lack of standardization, structural reliability defects, and functional failures in the prior art.
[0005] A method for verifying the service life of conductive sheets in a fire-resistant conductive hose includes the following steps: Insert the waveguide with two wave structures into one end of the fire-resistant conductive hose, and extend the two ends of the waveguide from the two ends of the fire-resistant conductive hose. Four clamps are installed on the fireproof conductive hose. The four clamps are distributed in pairs on the outside of the two rolling corrugated structures. During the clamp tightening process, first, the value of the electronic wrench is set to zero, then the predetermined torque value is set, and the clamp is tightened by rotating the electronic wrench. The tightening stops when the predetermined torque value on the electronic wrench is lit. Record the appearance of the fire-resistant conductive hose, and then use an electronic wrench to rotate in the opposite direction to remove all four clamps; Clamp one end of the waveguide tube and slowly pull it out of the fireproof conductive hose. After pulling it out, observe the appearance quality and shape of the conductive sheet. Use a flattening tool to flatten any conductive sheets that have been rolled up or deformed. Repeat the above steps until the conductive sheet in the fire-resistant conductive hose is damaged, at which point the test ends.
[0006] In an optional or preferred embodiment, before the rolling waveguide is inserted into the fire-resistant conductive hose, lubricant is applied to the surface of the rolling waveguide with a brush.
[0007] In an optional or preferred embodiment, the outer clamp is 5 mm away from the port of the fire-resistant conductive hose.
[0008] In an optional or preferred embodiment, the distance between two adjacent clamps on the same side is 5mm.
[0009] In optional or preferred embodiments, the installation directions of two adjacent clamps on the same side are perpendicular.
[0010] In optional or preferred embodiments, the clamp is selected as model HB3-30-2002.
[0011] In optional or preferred embodiments, the rolling waveguide is selected as model HB4-110-83.
[0012] In optional or preferred embodiments, the predetermined torque value of the electronic wrench is 4 to 8 N.
[0013] In an optional or preferred embodiment, the two wave structures on the waveguide are located at a distance of at least 35 mm from the end of the fire-resistant conductive hose.
[0014] In optional or preferred embodiments, under the same torque and clamp fastening installation conditions, the average maximum number of disassemblies for semi-hard copper, fully soft copper, and stainless steel conductive sheets are 16, 28, and 48, respectively.
[0015] Based on the above technical solution, the embodiments of this application have at least the following beneficial effects: By repeatedly performing the complete process of "inserting the waveguide—installing the clamp—tightening—recording—disassembling—pulling out—observing and flattening," a standardized disassembly and assembly cycle is formed. Each completed cycle is counted as one disassembly and assembly count. By continuously performing this cycle, the composite stress (including radial compressive load, axial friction, repeated deformation, etc.) borne by the conductive sheet is gradually accumulated until the conductive sheet suffers structural damage (fracture, through crack). The verification method of this invention, by constructing a complete disassembly and assembly cycle process, achieves an objective quantitative assessment of the service life of the conductive sheet, providing a reliable basis for product design and quality control, and effectively solving problems such as lack of standardization, structural reliability defects, and functional failures in the prior art. Attached Figure Description
[0016] The present application will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram showing the positional relationship between the four clamps, the waveguide, and the fireproof conductive hose in the embodiments of this application; Figure 2 This is a cross-sectional view of the fire-resistant conductive flexible tube in an embodiment of this application.
[0017] Possession Mark: 110 - Rolling wave structure; 100 - Rolling wave conduit; 200 - Fire-resistant conductive hose; 300 - Clamp; 210 - Inner rubber layer; 220 - Braided layer; 230 - Conductive sheet; 240 - Fire-resistant layer. Detailed Implementation
[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0023] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0024] Currently, fire-resistant conductive flexible hose systems used in the domestic market employ a four-clamp torque-fixing structure, and the design length of the built-in conductive plate must meet the installation specification of ≥8mm. The connection mechanism of this system relies on corrugated metal connectors, achieving dual contact between the hose wall and the conductive plate through bidirectional insertion of the hose, supplemented by clamp tightening with a preset torque value to complete assembly. However, the current technology has the following key problems: 1) Lack of standardization: There is a lack of clear installation and operation procedures (including disassembly and assembly cycle thresholds) and a service life assessment system; 2) Structural reliability defects: Under the combined stress (external compressive load and internal friction and wear), the conductive sheet is prone to accelerated wear, which eventually leads to structural fracture. 3) Functional Failure: Loss of structural integrity of the conductive sheet will directly lead to the interruption of the continuity of the conductive medium in the hose, thereby causing systemic functional failure. This failure manifests as irreversible degradation of conductivity, ultimately causing the product to lose its designed function and prematurely exit the service life, significantly increasing the total life cycle cost.
[0025] Although existing technologies attempt to optimize the system through structural improvements or replacement of conductive sheets, they have not fundamentally solved the critical problem of insufficient conductive sheet lifespan leading to functional failure of the entire hose. This deficiency makes it difficult for existing solutions to meet the aerospace industry's requirements for long lifespan and high reliability of fire-resistant conductive rubber hoses.
[0026] Reference Figure 1 A method for verifying the service life of conductive sheets in a fire-resistant conductive hose includes the following steps: A wave-conductor 100 with two wave structures 110 is inserted into one end of a fire-resistant conductive hose 200, and the two ends of the wave-conductor 100 extend out from the two ends of the fire-resistant conductive hose 200. Four clamps 300 are installed on the fireproof conductive hose 200. The four clamps 300 are distributed in pairs on the outside of the two rolling wave structures 110. During the tightening process of the clamps 300, the value of the electronic wrench is first set to zero, and then the predetermined torque value is set. The clamps 300 are tightened by rotating the electronic wrench to clamp them. The tightening stops when the predetermined torque value on the electronic wrench is lit. Record the appearance of the fire-resistant conductive hose 200, and then use an electronic wrench to rotate in the opposite direction to remove all four clamps 300; Clamp one end of the waveguide 100 and slowly pull it out of the fireproof conductive hose 200. After pulling it out, observe the appearance quality and shape of the conductive sheet 230. Use a flattening tool to flatten the conductive sheet 230 that has been rolled up or deformed. Repeat the above steps until the conductive sheet 230 in the fireproof conductive hose 200 is damaged, then the test ends.
[0027] Reference Figure 2 The fire-resistant conductive hose 200 includes an inner rubber layer 210, a braided layer 220, a conductive sheet 230, and a fire-resistant layer 240. The two sides of the conductive sheet 230 are folded inward to cover the ends of the inner rubber layer 210, and the folded-in end of the conductive sheet 230 extends a certain distance along the length of the fire-resistant conductive hose 200.
[0028] This method quantifies the damage accumulation process of the conductive sheet 230 under combined stress through standardized installation-disassembly cycle operations, combined with precise torque control and structural condition monitoring, until structural damage occurs, thereby determining its service life threshold.
[0029] The verification method of this invention achieves an objective quantitative assessment of the service life of the conductive sheet 230 by constructing a complete disassembly and assembly cycle. First, the waveguide 100 with two wave structures 110 is inserted into one end of the fire-resistant conductive hose 200, ensuring that both ends of the waveguide 100 are exposed outside the fire-resistant conductive hose 200. During insertion, the wave structures 110 of the waveguide 100 come into contact with the inner wall of the hose and the conductive sheet 230, creating a realistic friction and compression environment.
[0030] Four clamps 300 are installed on the fire-resistant conductive flexible conduit 200, with the four clamps 300 distributed in pairs on the outer sides of the two corrugated structures 110. During the tightening process of the clamps 300, the electronic wrench is first reset to zero, then a predetermined torque value is set. The clamps 300 are then rotated and tightened using the electronic wrench, stopping when the predetermined torque value on the electronic wrench illuminates. This ensures that the torque value is completely consistent for each tightening operation, avoiding torque fluctuations that occur during manual operation.
[0031] After tightening the clamps 300, record the appearance of the fire-resistant conductive hose 200, including whether there are any indentations or deformations on the hose surface, and whether the clamps 300 are misaligned. Then, use an electronic wrench to rotate in the opposite direction to remove all four clamps 300. This disassembly process is also controlled by an electronic wrench to ensure consistent operation.
[0032] After disassembly, clamp one end of the waveguide 100 and slowly pull it out of the fire-resistant conductive hose 200. This slow pulling process avoids non-test-related damage to the conductive sheet 230 due to sudden pulling force, ensuring the accuracy of the test results.
[0033] After pulling it out, focus on observing the appearance and shape of the conductive sheet 230, checking for structural damage such as curling, breakage, cracks, or edge curling. For conductive sheets 230 that have been curled or slightly deformed, use a flattening tool to flatten them back to their original state for the next round of testing.
[0034] Subsequently, the complete process of "inserting the waveguide 100—installing the clamp 300—tightening—recording—disassembling—pulling out—observing and flattening" is repeated to form a standardized disassembly and assembly cycle. Each completed cycle is counted as one disassembly and assembly operation. By continuously performing this cycle, the combined stress (including radial compressive load, axial friction, repeated deformation, etc.) borne by the conductive sheet 230 is gradually accumulated until the conductive sheet 230 suffers structural damage (fracture, through crack).
[0035] This verification method, through the above process, achieves an objective quantitative assessment of the service life of the conductive sheet 230, providing a reliable basis for product design and quality control, and effectively solving problems such as lack of standardization, structural reliability defects, and functional failures in existing technologies.
[0036] In some embodiments, before inserting the waveguide 100 into the fire-resistant conductive hose 200, lubricant is evenly applied to the surface of the waveguide 100 using a brush. The use of lubricant effectively reduces the coefficient of friction between the waveguide 100 and the inner wall of the hose, preventing abnormal scratches or deformation of the conductive sheet 230 upon initial insertion due to dry friction. This not only ensures the reliability of the testing process but also makes the test results closer to actual operating conditions, thereby improving the accuracy of the evaluation results.
[0037] The outer clamp 300 is 5mm away from the port of the fire-resistant conductive hose 200. This distance ensures that the clamping force of the clamp 300 can be effectively transmitted to the conductive sheet 230 area, while avoiding deformation of the hose end due to the clamp 300 being too close to the port, which would affect the positioning of the conductive sheet 230. This design effectively solves the test deviation problem caused by improper clamp 300 positioning, making the test results more reliable.
[0038] The distance between two adjacent clamps 300 on the same side is 5mm, and the installation directions of the two adjacent clamps 300 on the same side are perpendicular. This arrangement of double clamps 300 and vertical installation can achieve uniform clamping of the hose circumferentially, effectively disperse radial pressure load, and avoid local stress concentration. This design solves the problem of abnormal wear of the conductive sheet 230 caused by uneven stress distribution during the test, so that the test results more realistically reflect the stress state of the conductive sheet 230 in actual use.
[0039] The clamp 300 is model HB3-30-2002, and the waveguide 100 is model HB4-110-83. These model selections are based on extensive experimental data, ensuring good compatibility between the testing equipment and the components used in actual applications. The HB3-30-2002 clamp 300 possesses good mechanical strength and dimensional stability, suitable for the repeated assembly and disassembly requirements of this test; the waveguide 110 dimension of the HB4-110-83 waveguide 100 has a high degree of compatibility with common fire-resistant conductive hoses, realistically simulating the insertion behavior of actual connectors.
[0040] The electronic wrench has a predetermined torque value of 4–8 N. This torque range has been verified through extensive experiments, ensuring the reliability of the hose connection while preventing plastic deformation or crushing of the conductive plate 230 due to excessive clamping force. This precise torque control is the key innovation of this invention, ensuring a high degree of consistency in torque value for each tightening operation and avoiding testing errors caused by torque fluctuations during manual operation.
[0041] The two wave-like structures 110 on the wave-like conduit 100 are located at least 35 mm from the end of the fire-resistant conductive hose 200. This positioning maximizes the simulation of the stress state of the conductive sheet 230 in the central region of the hose, avoiding uneven stress distribution caused by eccentric installation.
[0042] The specific steps for this application are as follows: 1. Select 2003 fire-resistant conductive hoses of the same specification and structure; 2. Select 30012 clamps of the same specification and material; 3. Select 1002 rolling waveguides; 4. Select one electronic wrench; 5. Select an appropriate amount of lubricant; 6. Check the brand, specifications / model, verification date, warranty period, and appearance quality of the selected fire-resistant conductive hose 200, clamp 300, conductive sheet 230, electronic wrench, and lubricant; 7. The operator uses a soft brush to evenly apply the lubricant to the surface of the wave, and then inserts the wave guide 100 into the two ends along the diameter of the hose. 8. Install clamps of the same specification 300 at both ends of the hose. The clamps 300 should be 5mm away from the hose ends, and the two adjacent clamps 300 on the same side should be 5mm apart. 9. Adjust the clamping head of the electronic wrench. After zeroing the value of the electronic wrench, set the torque parameter setting value of the electronic wrench to 4-8N. Make the clamping head of the electronic wrench lock the clamp 300 and rotate it to tighten it until the torque parameter setting value is lit and then stop. 10. Record the appearance and torque value, and then use the same rotation method with an electronic wrench to disassemble the clamps 300 in reverse order. After all 4 clamps 300 have been disassembled, clamp and fix one end of the waveguide 100, and slowly pull it out manually by swinging it up and down or rotating it.
[0043] 11. After pulling out, observe the appearance quality and shape of the conductive sheet 230. For conductive sheets 230 that have been rolled up or deformed, flatten them manually or using a flattening tool.
[0044] 12. After completing the above 11 items, one cycle is completed. After observing that the hose, rolling wave, clamp 300, and conductive sheet 230 are undamaged, the next cycle can begin. The test ends when the conductive sheet 230 or the hose is damaged.
[0045] 13. Record the experimental data for each cycle of the experiment.
[0046] 14. Perform the above 13 tests on the remaining hoses in a cycle. Record the results of each test.
[0047] As shown in Tables 1, 2, and 3 below, under the same torque clamping condition of 300 mm, the average maximum number of disassembly cycles for semi-hard copper, fully soft copper, and stainless steel conductive sheets are 16, 28, and 48, respectively. This data is a direct verification result of the method of this invention. Based on this data, designers can select the most suitable conductive sheet material according to the actual application scenario. For example, in the aerospace field, where extremely high conductivity and long service life are required, stainless steel conductive sheets should be given priority.
[0048] Table 1:
[0049] Table 2:
[0050] Table 3:
[0051] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.
Claims
1. A method for verifying the service life of conductive sheets in a fire-resistant conductive hose, characterized in that, Includes the following steps: Insert the waveguide with two wave structures into one end of the fire-resistant conductive hose, and extend the two ends of the waveguide from the two ends of the fire-resistant conductive hose. Four clamps are installed on the fireproof conductive hose. The four clamps are distributed in pairs on the outside of the two rolling corrugated structures. During the clamp tightening process, first, the value of the electronic wrench is set to zero, then the predetermined torque value is set, and the clamp is tightened by rotating the electronic wrench. The tightening stops when the predetermined torque value on the electronic wrench is lit. Record the appearance of the fire-resistant conductive hose, and then use an electronic wrench to rotate in the opposite direction to remove all four clamps; Clamp one end of the waveguide tube and slowly pull it out of the fireproof conductive hose. After pulling it out, observe the appearance quality and shape of the conductive sheet. Use a flattening tool to flatten any conductive sheets that have been rolled up or deformed. Repeat the above steps until the conductive sheet in the fire-resistant conductive hose is damaged, at which point the test ends.
2. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: Before inserting the waveguide into the fire-resistant conductive hose, apply lubricant to the surface of the waveguide with a brush.
3. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The outer clamp is 5mm away from the port of the fireproof conductive hose.
4. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The distance between two adjacent clamps on the same side is 5mm.
5. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The installation directions of two adjacent clamps on the same side are perpendicular.
6. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The clamp used is model HB3-30-2002.
7. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The rolling waveguide is model HB4-110-83.
8. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The rated torque of an electronic wrench is 4~8N.
9. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: The two wave structures on the waveguide are located at least 35 mm from the end of the fire-resistant conductive hose.
10. The method for verifying the service life of the conductive sheet in the fire-resistant conductive hose according to claim 1, characterized in that: Under the same torque and clamp fastening conditions, the average maximum number of disassemblies for semi-hard copper, fully soft copper, and stainless steel conductive sheets were 16, 28, and 48, respectively.