A stress testing system for heat shrink sleeves

Abstract

The present application relates to heat shrink sleeve test technical field, especially to a kind of stress test system of heat shrink sleeve, comprising: test module, to carry out stress test to heat shrink sleeve;Detection module is connected with the test module, including with the clamping device is connected to detect the area of wear area in clamping surface visual sensor;Clamping adjustment module is connected with the test module, to determine the micro-tilt angle compensation of clamping surface according to wear area area proportion in clamping surface;Sampling adjustment module is connected with the detection module and the clamping adjustment module respectively, to determine the weight distribution coefficient of low temperature sampling point according to the difference between actual temperature and target temperature in heating process;Cooling adjustment module is connected with the test module and the sampling adjustment module respectively, to determine cooling rate limit value according to cooling pipe surface dew coverage area proportion.The present application improves the stress test stability of heat shrink sleeve.

Description

Technical Field

[0001] This invention relates to the field of heat shrink tubing testing technology, and more particularly to a stress testing system for heat shrink tubing. Background Technology

[0002] Heat shrink tubing, a functional polymer material with heat-shrinkable properties, has been widely used in key fields such as electronics, power transmission, aerospace, and automotive industries due to its excellent insulation, sealing, and mechanical strength. For example, it is used for insulating wire joints in electronic equipment, sealing and moisture-proofing terminals and intermediate joints in high-voltage cables, and structural fixation and protection in aerospace wiring harnesses under extreme environments. With the increasing demands for product reliability from downstream applications, the mechanical performance stability of heat shrink tubing during service, especially its stress characteristics (such as stress retention at high temperatures, resistance to stress cracking at low temperatures, and stress relaxation behavior after long-term service), directly determines the operational safety and service life of end products. Therefore, conducting accurate and comprehensive stress testing on heat shrink tubing has become a core aspect of industry quality control. However, current stress testing systems and methods for heat shrink tubing still face several technical bottlenecks, making it difficult to meet the demands for high precision and high stability testing.

[0003] Chinese Patent Publication No. CN115326860A discloses a testing system for the retraction stress of heat shrink tubing, comprising a data acquisition terminal, an experimental data input terminal, a processing center, and a display terminal. The processing center includes a preset parameter processing unit, a storage unit, a data comparison unit, a data processing unit, and a threshold unit. The experimental data input terminal inputs the parameter data to be tested into the processing center. The preset parameter processing unit within the processing center processes the parameter data, which includes temperature parameters and the corresponding retraction force parameter ranges. Based on the input temperature parameters and the corresponding retraction force parameter ranges, the preset parameter processing unit obtains conversion factor ranges corresponding to different temperature parameters and transmits these ranges to the storage unit for storage. The data acquisition terminal acquires the test temperature of the external environment and the surface tension of the heat shrink tubing, and transmits the acquired test temperature and surface tension of the heat shrink tubing to the processing center. Therefore, it can be seen that the heat shrink tubing retraction stress testing system has the problem that after long-term use, the clamping surface will wear due to friction and load, resulting in a reduction in the effective contact area between the clamping surface and the tubing, causing clamping slippage or stress loading offset, which leads to fluctuations in test data and thus reduces the stability of the heat shrink tubing stress test. Summary of the Invention

[0004] To address this issue, the present invention provides a stress testing system for heat shrink tubing, which overcomes the problem in the prior art where, after long-term use, the clamping surface wears due to friction and load, resulting in a reduction in the effective contact area between the clamping surface and the tubing, leading to clamping slippage or stress loading offset, causing fluctuations in test data, and thus reducing the stability of stress testing of heat shrink tubing.

[0005] To achieve the above objectives, the present invention provides a stress testing system for heat shrink tubing, comprising:

[0006] The testing module is used to perform stress testing on the heat shrink tubing, including a clamp for holding the heat shrink tubing, a tensile testing machine for performing stress testing on the heat shrink tubing, a heating tube connected to the tensile testing machine for heating the tensile testing machine to perform high-temperature stress testing on the heat shrink tubing, and a cooling tube connected to the tensile testing machine for cooling the tensile testing machine to perform low-temperature stress testing on the heat shrink tubing.

[0007] The detection module, which is connected to the test module, includes a vision sensor connected to the clamp to detect the area of ​​the wear region in the clamping surface, a temperature sensor connected to the tensile testing machine to detect the heating temperature, and a capacitive sensor connected to the cooling pipe to detect the area of ​​condensation covering the surface of the cooling pipe.

[0008] A clamping adjustment module, which is connected to the test module, is used to determine the micro-tilt angle compensation amount of the clamping surface based on the proportion of the wear area in the clamping surface.

[0009] A sampling adjustment module, which is connected to the detection module and the clamping adjustment module respectively, is used to determine the weight allocation coefficient of the low temperature sampling point based on the difference between the actual temperature and the target temperature during the heating process.

[0010] A cooling adjustment module, which is connected to the test module and the sampling adjustment module respectively, is used to determine the cooling rate limit value based on the proportion of condensation coverage area on the surface of the cooling pipe.

[0011] Furthermore, the clamping adjustment module determines that the stress test stability of the heat shrink tubing meets the requirements when the proportion of the wear area in the clamping surface is less than or equal to a preset first proportion.

[0012] The clamping adjustment module determines that the stress test stability of the heat shrink tubing does not meet the requirements when the proportion of the worn area in the clamping surface is greater than the preset first proportion.

[0013] Furthermore, in response to the fact that the proportion of the worn area in the clamping surface is greater than the preset first proportion and less than or equal to the preset second proportion, the clamping adjustment module initially determines that the environmental adaptability of the stress test does not meet the requirements.

[0014] Furthermore, the clamping adjustment module increases the micro-tilt angle compensation amount of the clamping surface in response to the fact that the proportion of the worn area in the clamping surface is greater than the preset second proportion;

[0015] The increase in the micro-tilt angle compensation of the clamping surface is determined by the difference between the proportion of the wear area in the clamping surface and the preset second proportion.

[0016] Furthermore, the sampling adjustment module determines that the environmental adaptability of the stress test meets the requirements when the difference between the actual temperature and the target temperature during the heating process is less than or equal to a preset first difference amount.

[0017] The sampling adjustment module determines that the environmental adaptability of the stress test does not meet the requirements when the difference between the actual temperature and the target temperature during the heating process is greater than the preset first difference amount.

[0018] Furthermore, in response to the difference between the actual temperature and the target temperature during the heating process being greater than the preset first difference amount and less than or equal to the preset second difference amount, the sampling adjustment module reduces the weight allocation coefficient of the low-temperature sampling point.

[0019] Furthermore, the sampling adjustment module responds to the fact that the difference between the actual temperature and the target temperature during the heating process is greater than the preset second difference amount, and preliminarily determines that the effectiveness of the environmental control for the stress test does not meet the requirements.

[0020] Furthermore, the reduction in the weight allocation coefficient of the low-temperature sampling point is determined by the difference between the actual temperature and the target temperature during the heating process and the preset first difference.

[0021] Furthermore, the cooling adjustment module determines that the environmental control effectiveness of the stress test meets the requirements when the condensation coverage area on the surface of the cooling pipe is less than or equal to a preset area ratio.

[0022] The cooling adjustment module responds to the fact that the condensation coverage area on the surface of the cooling pipe is greater than the preset area ratio, determines that the environmental control effectiveness of the stress test does not meet the requirements, and increases the cooling rate limit value.

[0023] Furthermore, the increase in the cooling rate limit value is determined by the difference between the percentage of condensation coverage area on the cooling pipe surface and the preset percentage of area.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The system of the present invention, by setting up a test module, a detection module, a clamping adjustment module, a sampling adjustment module, and a cooling adjustment module, adjusts the micro-tilt angle compensation of the clamping surface according to the proportion of the worn area in the clamping surface. Due to long-term friction between the clamping surface and the heat shrink tubing, local wear, depressions, and scratches occur, resulting in a decrease in the flatness of the clamping surface. The contact area between the worn area and the tubing is reduced, while the pressure in the unworn area is too high, forming a force difference. By increasing the micro-tilt angle compensation of the clamping surface, the clamping surface can be slightly tilted towards the side of the depression until the depression area forms effective contact with the tubing. The pressure in the high convex area is distributed to a larger contact area, ultimately achieving uniform pressure between the clamping surface and the tubing in all areas, eliminating the force difference. The weight allocation coefficient of the low-temperature sampling point is adjusted according to the difference between the actual temperature and the target temperature during the heating process. Since the stress test needs to simulate the high-temperature stress holding test of the heat shrink tubing, the aging of the built-in heating plate and heating wire will lead to uneven heating power. Precise adjustment of heating power can lead to a widening deviation between the set temperature and the actual temperature. By reducing the weighting coefficient of low-temperature sampling points, the impact of abnormal low-temperature data on the overall temperature calculation results can be weakened. This allows the system to more accurately identify the true state of only localized low temperatures while the overall temperature meets the standard, avoiding power adjustment disorder caused by misjudgment. This ensures that the heat shrink tubing is in a standard high-temperature stress testing environment. The cooling rate limit is adjusted according to the proportion of condensation coverage on the cooling tube surface. Since the test system needs to simulate a low-temperature environment for low-temperature stress testing, if the cooling temperature is too low, moisture in the air will condense on the surface of the cooling components, and after evaporation, it will increase the local humidity. By increasing the cooling rate limit, the maximum heat dissipation capacity of the cooling system can be improved, offsetting the efficiency loss caused by humidity, ensuring that the cooling rate meets the standard, maintaining a stable and sufficient cooling intensity, ensuring that the heat shrink tubing is in a continuously stable low-temperature testing environment, reducing local temperature fluctuations caused by water vapor, ensuring the accuracy of test data, and improving the stress testing stability of the heat shrink tubing.

[0025] Furthermore, the system of the present invention adjusts the micro-tilt angle compensation of the clamping surface by setting a preset first ratio and a preset second ratio. Due to long-term friction between the clamping surface and the heat shrink tubing, local wear, dents, and scratches occur, resulting in a decrease in the flatness of the clamping surface. The contact area between the worn area and the tubing is reduced, while the pressure in the unworn area is too high, forming a force difference. By increasing the micro-tilt angle compensation of the clamping surface, the clamping surface can be slightly tilted towards the side where the low-lying area is located until the low-lying area forms effective contact with the tubing. The pressure in the high-convex area is distributed to a larger contact area, ultimately achieving uniform pressure between each area of ​​the clamping surface and the tubing, eliminating the force difference, and further improving the stress testing stability of the heat shrink tubing.

[0026] Furthermore, the system of the present invention adjusts the weight allocation coefficient of low-temperature sampling points by setting a preset first difference amount and a preset second difference amount. Since stress testing needs to simulate the high-temperature stress holding test of heat shrink tubing, the aging of the system's built-in heating element and heating wire can lead to uneven heating power and inaccurate adjustment of heating power, resulting in an increased deviation between the set temperature and the actual temperature. By reducing the weight allocation coefficient of low-temperature sampling points, the impact of abnormal low-temperature data on the overall temperature calculation result can be weakened, enabling the system to more accurately identify the true state of only local low temperature and overall temperature compliance, avoiding power adjustment disorder caused by misjudgment, ensuring that the heat shrink tubing is in a standard high-temperature stress test environment, and further improving the stress test stability of the heat shrink tubing.

[0027] Furthermore, the system of the present invention adjusts the cooling rate limit value by setting a preset area ratio. Since the test system needs to simulate a low-temperature environment for low-temperature stress testing, if the cooling temperature is too low, moisture in the air will condense into water on the surface of the cooling component. After evaporation, the local humidity will increase. By increasing the cooling rate limit value, the maximum heat dissipation capacity of the cooling system can be improved, offsetting the efficiency loss caused by humidity, ensuring that the cooling rate meets the standard, maintaining a stable and sufficient cooling intensity, ensuring that the heat shrink tubing is in a continuous and stable low-temperature test environment, reducing local temperature fluctuations caused by water vapor, ensuring the accuracy of test data, and further improving the stress test stability of the heat shrink tubing. Attached Figure Description

[0028] Figure 1 This is an overall structural block diagram of the stress testing system for heat shrink tubing according to an embodiment of the present invention;

[0029] Figure 2 This is a flowchart illustrating the process of determining the micro-tilt angle compensation of the clamping surface in the stress testing system for heat shrink tubing according to an embodiment of the present invention.

[0030] Figure 3 The flowchart illustrates the process of determining the weight allocation coefficients for low-temperature sampling points in the stress testing system for heat shrink tubing according to an embodiment of the present invention.

[0031] Figure 4 This is a flowchart illustrating the process of determining the cooling rate limit value in the stress testing system for heat shrink tubing according to an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0033] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0035] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The diagrams shown are, respectively, an overall structural block diagram of the stress testing system for heat shrink tubing according to an embodiment of the present invention, a logic flowchart for determining the micro-tilt angle compensation of the clamping surface, a logic flowchart for determining the weight allocation coefficient of the low-temperature sampling point, and a logic flowchart for determining the cooling rate limit value. The present invention provides a stress testing system for heat shrink tubing, comprising:

[0037] The testing module is used to perform stress testing on the heat shrink tubing, including a clamp for holding the heat shrink tubing, a tensile testing machine for performing stress testing on the heat shrink tubing, a heating tube connected to the tensile testing machine for heating the tensile testing machine to perform high-temperature stress testing on the heat shrink tubing, and a cooling tube connected to the tensile testing machine for cooling the tensile testing machine to perform low-temperature stress testing on the heat shrink tubing.

[0038] The detection module, which is connected to the test module, includes a vision sensor connected to the clamp to detect the area of ​​the wear region in the clamping surface, a temperature sensor connected to the tensile testing machine to detect the heating temperature, and a capacitive sensor connected to the cooling pipe to detect the area of ​​condensation covering the surface of the cooling pipe.

[0039] A clamping adjustment module, which is connected to the test module, is used to determine the micro-tilt angle compensation amount of the clamping surface based on the proportion of the wear area in the clamping surface.

[0040] A sampling adjustment module, which is connected to the detection module and the clamping adjustment module respectively, is used to determine the weight allocation coefficient of the low temperature sampling point based on the difference between the actual temperature and the target temperature during the heating process.

[0041] A cooling adjustment module, which is connected to the test module and the sampling adjustment module respectively, is used to determine the cooling rate limit value based on the proportion of condensation coverage area on the surface of the cooling pipe.

[0042] Specifically, the gripper is a hydraulically driven gripper.

[0043] Specifically, the tensile testing machine is a servo motor driven axial tensile testing machine.

[0044] Specifically, the clamping surface micro-tilt compensation amount refers to the correction parameter value set to adjust the angle of the clamping surface in order to correct the slight tilt caused by wear, installation deviation or long-term deformation of the clamping surface of the clamp.

[0045] Specifically, the process of adjusting the micro-tilt angle of the clamping surface is as follows: the fixed end and the movable end of the clamp are connected by a precision lead screw. After receiving the compensation signal, the servo motor (with an accuracy of up to 0.001°) drives the lead screw to rotate forward / reverse, causing the movable end to rise or fall slightly, thereby correcting the angle of the clamping surface.

[0046] Specifically, the weighting coefficient for low-temperature sampling points is a correction coefficient set for sampling points with lower temperatures during the acquisition and processing of stress test data at multiple temperature points, used to quantify the importance of their data.

[0047] Specifically, the low temperature is generally between -40℃ and 0℃.

[0048] Specifically, the cooling rate limit refers to the maximum allowable temperature drop per unit time when the heat shrink tubing is cooled from a high temperature to a target low temperature during the test to ensure accurate stress test results and conformity with the actual performance of the material.

[0049] In implementation, the system of this invention adjusts the micro-tilt angle compensation of the clamping surface based on the proportion of the worn area in the clamping surface by setting up a testing module, a detection module, a clamping adjustment module, a sampling adjustment module, and a cooling adjustment module. Due to long-term friction between the clamping surface and the heat shrink tubing, localized wear, dents, and scratches occur, leading to a decrease in the flatness of the clamping surface. This reduces the contact area between the worn area and the tubing, while the pressure in the unworn area is too high, creating a force difference. By increasing the micro-tilt angle compensation, the clamping surface can be slightly tilted towards the side of the low-lying area until the low-lying area forms effective contact with the tubing. The pressure in the high-convex area is then distributed over a larger contact area, ultimately achieving pressure uniformity between the clamping surface and the tubing, eliminating the force difference. The weight allocation coefficient of the low-temperature sampling points is adjusted based on the difference between the actual temperature and the target temperature during heating. Since stress testing needs to simulate the high-temperature stress holding test of the heat shrink tubing, aging of the system's built-in heating elements and heating wires can lead to uneven heating power, making precise heating adjustment impossible. Power consumption can lead to a greater deviation between the set temperature and the actual temperature. By reducing the weighting coefficient of low-temperature sampling points, the impact of abnormal low-temperature data on the overall temperature calculation results can be weakened. This allows the system to more accurately identify the true state of only localized low temperatures while the overall temperature meets the standard, avoiding power adjustment disorder caused by misjudgment. This ensures that the heat shrink tubing is in a standard high-temperature stress test environment. The cooling rate limit is adjusted according to the proportion of condensation coverage on the cooling tube surface. Since the test system needs to simulate a low-temperature environment for low-temperature stress testing, if the cooling temperature is too low, moisture in the air will condense on the surface of the cooling components. After evaporation, it will increase the local humidity. By increasing the cooling rate limit, the maximum heat dissipation capacity of the cooling system can be improved, offsetting the efficiency loss caused by humidity, ensuring that the cooling rate meets the standard, maintaining a stable and sufficient cooling intensity, ensuring that the heat shrink tubing is in a continuously stable low-temperature test environment, reducing local temperature fluctuations caused by water vapor, ensuring the accuracy of test data, and improving the stress test stability of the heat shrink tubing.

[0050] Specifically, the clamping adjustment module determines that the stress test stability of the heat shrink tubing meets the requirements when the proportion of the wear area in the clamping surface is less than or equal to a preset first proportion.

[0051] The clamping adjustment module determines that the stress test stability of the heat shrink tubing does not meet the requirements when the proportion of the worn area in the clamping surface is greater than the preset first proportion.

[0052] Specifically, the clamping adjustment module responds to the fact that the proportion of the wear area in the clamping surface is greater than the preset first proportion and less than or equal to the preset second proportion, initially determining that the environmental adaptability of the stress test does not meet the requirements, and determines whether the environmental adaptability of the stress test meets the requirements based on the difference between the actual temperature and the target temperature during the heating process.

[0053] It is understandable that the first preset percentage is less than the second preset percentage, and the three intervals divided by the first and second preset percentages correspond to three different scenarios:

[0054] The first interval is when the proportion of the wear area in the clamping surface is less than or equal to the preset first proportion, which corresponds to the situation where the stress test stability of the heat shrink tubing meets the requirements.

[0055] The second interval is when the proportion of the worn area in the clamping surface is greater than the preset first proportion and less than or equal to the preset second proportion. The corresponding situation is: because the stress test needs to simulate the high temperature stress holding test of the heat shrink tubing, the aging of the built-in heating plate and heating wire will cause uneven heating power, making it impossible to accurately adjust the heating power, resulting in an increased deviation between the set temperature and the actual temperature.

[0056] The third interval is when the proportion of the worn area in the clamping surface is greater than the preset second proportion. The corresponding situation is: due to the long-term friction between the clamping surface and the heat shrink tubing, local wear, dents, and scratches occur, resulting in a decrease in the flatness of the clamping surface. The contact area between the worn area and the tubing is reduced, while the pressure in the unworn area is too high, resulting in a force difference.

[0057] Understandably, in the clamping adjustment logic of heat shrink tubing stress testing, the use of preset first and second percentages to characterize test stability is based on the risk classification correlation between the degree of wear on the clamping surface and test stability. Two thresholds are used to divide the wear into safe, warning, and failure zones, achieving accurate stability assessment and differentiated processing, avoiding excessive intervention or judgment lag caused by a single threshold. The core function of the preset first percentage is to define the maximum boundary where wear does not affect stability, while the core function of the preset second percentage is to further classify the risk level of wear within the range of unqualified stability, corresponding to different processing strategies. The preset first and second percentages can be set according to actual working conditions. The setting of the preset first and second percentages aims to ensure the stability and practicality of heat shrink tubing stress testing. Optionally, the preset first and second percentages are determined through a limited number of tests by evaluating the stress testing effect of different wear areas on the heat shrink tubing. The determined preset first and second percentages should be neither too small nor cause excessive interference to the stress testing process of the heat shrink tubing. For example, the preset first percentage is generally selected in the range of [8%, 12%], and the preset second percentage is generally selected in the range of [13%, 17%].

[0058] Preferably, the first percentage is 10% in the preferred embodiment, and the second percentage is 15% in the preferred embodiment.

[0059] Specifically, the percentage of the area of ​​the worn region in the clamping surface is the ratio of the area of ​​the worn region in the clamping surface to the total area of ​​the clamping surface.

[0060] In practice, the system of the present invention determines the stress test stability of heat shrink tubing by setting a preset first ratio and a preset second ratio, thereby reducing the impact of inaccurate determination of the stress test stability of heat shrink tubing leading to a decrease in the accuracy of stress test of heat shrink tubing, and further improving the stress test stability of heat shrink tubing.

[0061] Specifically, the clamping adjustment module increases the micro-tilt angle compensation amount of the clamping surface in response to the fact that the proportion of the worn area in the clamping surface is greater than the preset second proportion;

[0062] The increase in the micro-tilt angle compensation of the clamping surface is determined by the difference between the proportion of the wear area in the clamping surface and the preset second proportion.

[0063] Specifically, when the difference between the proportion of the wear area in the clamping surface and the preset second proportion is within 3%, the micro-tilt angle compensation of the clamping surface is increased to 1.1 times the original value. When the difference between the proportion of the wear area in the clamping surface and the preset second proportion exceeds 3%, in addition to increasing to 1.1 times the original value, the micro-tilt angle compensation of the clamping surface increases by 0.1° for every 1% increase. For example, if the difference between the proportion of the wear area in the clamping surface and the preset second proportion is 5%, and the current micro-tilt angle compensation of the clamping surface is 0.5°, the increased micro-tilt angle compensation of the clamping surface is 0.5×1.1+0.1×2=0.75°.

[0064] In practice, the system of the present invention adjusts the micro-tilt angle compensation of the clamping surface by setting a preset first ratio and a preset second ratio. Due to long-term friction between the clamping surface and the heat shrink tubing, local wear, dents, and scratches occur, resulting in a decrease in the flatness of the clamping surface. The contact area between the worn area and the tubing is reduced, while the pressure in the unworn area is too high, forming a force difference. By increasing the micro-tilt angle compensation of the clamping surface, the clamping surface can be slightly tilted towards the side where the low-lying area is located until the low-lying area forms effective contact with the tubing. The pressure in the high-convex area is distributed to a larger contact area, ultimately achieving uniform pressure between the clamping surface and the tubing in all areas, eliminating the force difference, and further improving the stress testing stability of the heat shrink tubing.

[0065] Specifically, the sampling adjustment module determines that the environmental adaptability of the stress test meets the requirements when the difference between the actual temperature and the target temperature during the heating process is less than or equal to a preset first difference amount.

[0066] The sampling adjustment module determines that the environmental adaptability of the stress test does not meet the requirements when the difference between the actual temperature and the target temperature during the heating process is greater than the preset first difference amount.

[0067] Specifically, the sampling adjustment module reduces the weight allocation coefficient of the low-temperature sampling point in response to the difference between the actual temperature and the target temperature during the heating process being greater than the preset first difference amount and less than or equal to the preset second difference amount.

[0068] Specifically, the sampling adjustment module responds to the fact that the difference between the actual temperature and the target temperature during the heating process is greater than the preset second difference amount, and initially determines that the environmental control effectiveness of the stress test does not meet the requirements. It then determines whether the environmental control effectiveness of the stress test meets the requirements based on the proportion of condensation coverage area on the surface of the cooling pipe.

[0069] It is understandable that the preset first difference is less than the preset second difference, and the three intervals divided by the preset first difference and the preset second difference correspond to three different situations:

[0070] The first interval is when the difference between the actual temperature and the target temperature during the heating process is less than or equal to the preset first difference amount, which corresponds to the situation where the environmental adaptability of the stress test meets the requirements.

[0071] The second range is when the difference between the actual temperature and the target temperature during the heating process is greater than the preset first difference amount and less than or equal to the preset second difference amount. The corresponding situation is: because the stress test needs to simulate the high temperature stress holding test of the heat shrink tubing, the aging of the built-in heating element and heating wire will cause uneven heating power, making it impossible to accurately adjust the heating power, resulting in an increased deviation between the set temperature and the actual temperature.

[0072] The third interval is when the difference between the actual temperature and the target temperature during the heating process is greater than the preset second difference amount. The corresponding situation is: because the test system needs to simulate a low-temperature environment to conduct low-temperature stress tests, the cooling temperature is too low, and the moisture in the air condenses into water on the surface of the cooling component, which then evaporates and increases the local humidity.

[0073] Understandably, in a heat shrink tubing stress testing system, the first and second differential values ​​characterize the environmental adaptability of the stress test. The core logic is to achieve gradient judgment and dynamic response of environmental adaptability by quantifying the temperature control accuracy during the heating process in stages. This avoids misjudgment based on a single threshold and accurately matches the impact of different temperature deviations on the test, ultimately ensuring the reliability of the stress test data. The first differential value is the minimum acceptable standard for environmental adaptability, and its core function is to define the acceptable safe range for temperature deviation. The second differential value is the gradient watershed for unacceptable environmental adaptability, and its core function is to distinguish between minor and severe non-compliance, avoiding a one-size-fits-all approach to all out-of-tolerance situations. The preset first and second differential values ​​can be set according to actual working conditions. The setting of the preset first and second differential values ​​aims to ensure the stability and practicality of the heat shrink tubing stress test. Optionally, the preset first difference and the preset second difference are determined through a limited number of tests by evaluating the effect of different temperature differences on the stress test of the heat shrink tubing. The determined preset first difference and the preset second difference should be neither too small nor cause excessive interference to the stress test process of the heat shrink tubing. For example, the preset first difference is generally selected in the range of [4℃, 6℃], and the preset second difference is generally selected in the range of [7℃, 9℃].

[0074] Preferably, the first differential amount is 5°C in a preferred embodiment, and the second differential amount is 8°C in a preferred embodiment.

[0075] Specifically, the difference between the actual temperature and the target temperature during the heating process is the difference between the target temperature and the actual temperature during the heating process.

[0076] In practice, the system of the present invention determines the environmental adaptability of stress testing by setting a preset first difference amount and a preset second difference amount, thereby reducing the impact of inaccurate determination of the environmental adaptability of stress testing on the stability of heat shrink tubing and further improving the stress testing stability of heat shrink tubing.

[0077] Specifically, the reduction in the weight allocation coefficient of the low-temperature sampling point is determined by the difference between the actual temperature and the target temperature during the heating process and the preset first difference.

[0078] Specifically, when the difference between the actual temperature and the target temperature during the heating process is within 2℃ and the preset first difference amount, the weight allocation coefficient of the low-temperature sampling point is reduced to 0.9 times the original value. When the difference between the actual temperature and the target temperature during the heating process exceeds 2℃, in addition to reducing it to 0.9 times the original value, the weight allocation coefficient of the low-temperature sampling point is reduced by 0.05 for every 1℃ increase. For example, if the difference between the actual temperature and the target temperature during the heating process is 4% and the preset first difference amount is 4%, the current weight allocation coefficient of the low-temperature sampling point is 0.4, and the reduced weight allocation coefficient of the low-temperature sampling point is 0.4×0.9-0.05×2=0.26.

[0079] In practice, the system of the present invention adjusts the weight allocation coefficient of low-temperature sampling points by setting a preset first difference amount and a preset second difference amount. Since stress testing needs to simulate the high-temperature stress holding test of heat shrink tubing, the aging of the system's built-in heating element and heating wire can lead to uneven heating power and inaccurate adjustment of heating power, resulting in an increased deviation between the set temperature and the actual temperature. By reducing the weight allocation coefficient of low-temperature sampling points, the impact of abnormal low-temperature data on the overall temperature calculation result can be weakened, enabling the system to more accurately identify the true state of only local low temperature and overall temperature compliance, avoiding power adjustment disorder caused by misjudgment, ensuring that the heat shrink tubing is in a standard high-temperature stress test environment, and further improving the stress test stability of the heat shrink tubing.

[0080] Specifically, the cooling adjustment module determines that the environmental control effectiveness of the stress test meets the requirements when the condensation coverage area on the surface of the cooling pipe is less than or equal to a preset area ratio.

[0081] The cooling adjustment module responds to the fact that the condensation coverage area on the surface of the cooling pipe is greater than the preset area ratio, determines that the environmental control effectiveness of the stress test does not meet the requirements, and increases the cooling rate limit value.

[0082] It is understandable that the two intervals defined by the preset area proportions correspond to two different scenarios:

[0083] The first interval is when the percentage of condensation coverage on the surface of the cooling pipe is less than or equal to the preset percentage, which corresponds to the situation where the effectiveness of environmental control for stress testing is confirmed to meet the requirements.

[0084] The second interval is when the condensation coverage area on the cooling pipe surface is greater than the preset area ratio. The corresponding situation is: because the test system needs to simulate a low-temperature environment for low-temperature stress testing, the cooling temperature is too low, and the moisture in the air condenses into water on the surface of the cooling components. After evaporation, it increases the local humidity.

[0085] Understandably, in a heat shrink tubing stress testing system, the percentage of condensation coverage area on the cooling tube surface is used to characterize the effectiveness of environmental control. The core logic is that condensation is essentially a direct reflection of deviations in environmental temperature and humidity control, while the area percentage quantifies the range, degree, and weight of this deviation in the test, ultimately serving the core objective of ensuring the accuracy of stress test data. The area percentage transforms the qualitative condensation phenomenon into a quantitative indicator of the degree of control failure, avoiding misjudgments of small local problems as overall failures or omissions of large-area failures, ensuring the objectivity and repeatability of the judgment criteria. The preset area percentage can be set according to actual working conditions. The preset area percentage is designed to ensure the stability and practicality of the heat shrink tubing stress test. Optionally, the preset area percentage is determined through a limited number of tests by evaluating the effect of different condensation areas on the stress test of the heat shrink tubing. The determined preset area percentage should be neither too small nor cause excessive interference to the stress test process of the heat shrink tubing. For example, the preset area percentage is generally selected within the range of [4%, 6%].

[0086] Preferably, the preset area ratio is 5% in the preferred embodiment.

[0087] Specifically, the percentage of condensation coverage on the surface of the cooling pipe is the ratio of the condensation coverage area on the surface of the cooling pipe to the total surface area of ​​the cooling pipe.

[0088] In practice, the system of the present invention determines the effectiveness of environmental control for stress testing by setting a preset area ratio, thereby reducing the impact of inaccurate determination of the effectiveness of environmental control for stress testing on the stability of heat shrink tubing under stress testing, and further improving the stability of stress testing of heat shrink tubing.

[0089] Specifically, the increase in the cooling rate limit value is determined by the difference between the percentage of condensation coverage area on the cooling pipe surface and the preset percentage of area.

[0090] Specifically, when the difference between the percentage of condensation coverage area on the cooling pipe surface and the preset percentage is within 2%, the cooling rate limit is increased to 1.2 times the original value. When the difference between the percentage of condensation coverage area on the cooling pipe surface and the preset percentage exceeds 1%, in addition to increasing to 1.2 times the original value, the cooling rate limit is increased by 1℃ / min for every 1% exceeding the preset percentage. For example, if the difference between the percentage of condensation coverage area on the cooling pipe surface and the preset percentage is 4%, the current cooling rate limit is 5℃ / min, and the increased cooling rate limit is 5×1.2+1×2=8℃ / min.

[0091] In practice, the system of the present invention adjusts the cooling rate limit value by setting a preset area ratio. Since the test system needs to simulate a low-temperature environment for low-temperature stress testing, if the cooling temperature is too low, moisture in the air will condense into water on the surface of the cooling component. After evaporation, the local humidity will increase. By increasing the cooling rate limit value, the maximum heat dissipation capacity of the cooling system can be improved, offsetting the efficiency loss caused by humidity, ensuring that the cooling rate meets the standard, maintaining a stable and sufficient cooling intensity, ensuring that the heat shrink tubing is in a continuous and stable low-temperature test environment, reducing local temperature fluctuations caused by water vapor, ensuring the accuracy of test data, and further improving the stress test stability of the heat shrink tubing.

[0092] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A stress testing system for heat shrink tubing, characterized by, The application relates to a stress test device for heat-shrinkable sleeves, which comprises a test module, a detection module, a clamping adjustment module, a sampling adjustment module and a cooling adjustment module. The test module is used for stress testing of the heat-shrinkable sleeves, and comprises a clamp used for clamping the heat-shrinkable sleeves, a tensile testing machine used for stress testing of the heat-shrinkable sleeves, a heating pipe connected with the tensile testing machine and used for heating the tensile testing machine to perform high-temperature stress testing of the heat-shrinkable sleeves, and a cooling pipe connected with the tensile testing machine and used for cooling the tensile testing machine to perform low-temperature stress testing of the heat-shrinkable sleeves. The detection module is connected with the test module and comprises a visual sensor connected with the clamp and used for detecting the area of the worn region on the clamping surface, a temperature sensor connected with the tensile testing machine and used for detecting the heating temperature, and a capacitive sensor connected with the cooling pipe and used for detecting the coverage area of the surface condensation of the cooling pipe. The clamping adjustment module is connected with the test module and used for determining the micro-inclination angle compensation amount of the clamping surface according to the area proportion of the worn region on the clamping surface. The sampling adjustment module is connected with the detection module and the clamping adjustment module respectively and used for determining the weight distribution coefficient of the low-temperature sampling point according to the difference between the actual temperature and the target temperature during the heating process. The cooling adjustment module is connected with the test module and the sampling adjustment module respectively and used for determining the cooling rate limiting value according to the coverage area proportion of the surface condensation of the cooling pipe.

2. The stress testing system of the heat shrink sleeve of claim 1, wherein, The clamping adjustment module determines that the stress test stability of the heat-shrinkable sleeves meets the requirements in response to the area proportion of the worn region on the clamping surface being less than or equal to a preset first proportion. The clamping adjustment module determines that the stress test stability of the heat-shrinkable sleeves does not meet the requirements in response to the area proportion of the worn region on the clamping surface being greater than the preset first proportion.

3. The stress testing system of heat shrinkable tubing according to claim 2, wherein, The clamping adjustment module preliminarily determines that the environmental adaptability of the stress test does not meet the requirements in response to the area proportion of the worn region on the clamping surface being greater than the preset first proportion and less than or equal to a preset second proportion.

4. The stress testing system of heat shrinkable tubing according to claim 3, wherein, The clamping adjustment module increases the micro-inclination angle compensation amount of the clamping surface in response to the area proportion of the worn region on the clamping surface being greater than the preset second proportion. The increasing range of the micro-inclination angle compensation amount of the clamping surface is determined by the difference between the area proportion of the worn region on the clamping surface and the preset second proportion.

5. The heat shrink sleeve stress testing system of claim 3, wherein, The sampling adjustment module determines that the environmental adaptability of the stress test meets the requirements in response to the difference between the actual temperature and the target temperature during the heating process being less than or equal to a preset first difference. The sampling adjustment module determines that the environmental adaptability of the stress test does not meet the requirements in response to the difference between the actual temperature and the target temperature during the heating process being greater than the preset first difference.

6. The stress testing system of heat shrinkable tubing of claim 5, wherein, The sampling adjustment module decreases the weight distribution coefficient of the low-temperature sampling point in response to the difference between the actual temperature and the target temperature during the heating process being greater than the preset first difference and less than or equal to a preset second difference.

7. The heat shrink sleeve stress testing system of claim 6, wherein, The sampling adjustment module preliminarily determines that the environmental control effectiveness of the stress test does not meet the requirements in response to the difference between the actual temperature and the target temperature during the heating process being greater than the preset second difference.

8. The stress testing system of heat shrinkable tubing according to claim 7, wherein, The decreasing range of the weight distribution coefficient of the low-temperature sampling point is determined by the difference between the difference between the actual temperature and the target temperature during the heating process and the preset first difference.

9. The stress testing system of heat shrinkable tubing according to claim 8, wherein, The cooling adjustment module determines that the environmental control effectiveness of the stress test meets the requirement in response to the surface dewing coverage area proportion of the cooling pipe being less than or equal to a preset area proportion. The cooling adjustment module determines that the environmental control effectiveness of the stress test does not meet the requirement and increases the cooling rate limit value in response to the surface dewing coverage area proportion of the cooling pipe being greater than the preset area proportion.

10. The stress testing system of heat shrinkable tubing of claim 9, wherein, The increase range of the cooling rate limit value is determined by the difference between the surface dewing coverage area proportion of the cooling pipe and the preset area proportion.

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