A test method for testing the performance of plastic fasteners

Abstract

This application relates to a test method for testing the performance of plastic fastening plugs. The test fixture has a plug mounting hole and an inflation connector, and an internal sealed space. After filling the test fixture with a medium solution, the plug can be installed on the fixture and then placed in a thermal shock test chamber for airtightness testing, high and low temperature testing, and durability testing. This test fixture can simulate an actual shell with a plug installed, the working medium inside the shell, and the actual installation position and torque of the plug. Ultimately, it can simulate the actual usage environment and installation state of the plug. Furthermore, since airtightness testing, high and low temperature testing, and durability testing can be performed simultaneously in the thermal shock test chamber, and by analyzing leakage at the plug mounting hole, cracking of the test plug, and torque attenuation rate, the influence of multiple factors on plug performance can be tested simultaneously, resulting in accurate test results. The structure of the test fixture is also relatively simple.

Description

Technical Field

[0001] This application relates to the field of component testing technology, and in particular to a test method for testing the performance of plastic fastening plugs. Background Technology

[0002] Currently, compared with metal screw plugs, plastic screw plugs have advantages such as ease of manufacturing, light weight, rust resistance, and low price. Many automakers and parts manufacturers have gradually replaced metal screw plugs with plastic screw plugs, especially in engine system parts such as transmission housings, drive pump filters, gear oil pumps, and motor plugs. These parts generally operate in environments ranging from -30℃ to 135℃ and have the function of sealing media such as oil. Therefore, plastic screw plugs are required to have sealing properties, resistance to media, and resistance to high and low temperatures. These properties will affect the quality performance of plastic screw plugs, and thus affect the overall vehicle quality and safety.

[0003] However, performance testing of plastic plug components under different media solutions, pressure conditions, and temperatures often involves only individual tests. The test results can only reflect a single factor, and therefore the final results often cannot reflect the performance under the combined influence of multiple factors. Summary of the Invention

[0004] This application provides a test method for testing the performance of plastic fastening plugs, in order to solve the problem in related technologies that it is difficult to conduct tests simultaneously under different media solutions, different pressure states, and different temperatures, and that it is difficult to accurately evaluate the performance of plastic fastening plugs.

[0005] In a first aspect, a test method for testing the performance of plastic fastening plugs is provided, comprising the following steps:

[0006] A test fixture is provided; the test fixture has a sealed space and is provided with a screw plug mounting hole and an inflation connector communicating with the sealed space;

[0007] The medium solution is filled into the sealed space, and the test plug is installed on the plug mounting hole with a set torque; the test pressure is applied to the sealed space through the air inlet connector, and then it is placed in the thermal shock test chamber for air tightness test, high and low temperature test and durability test;

[0008] The system obtains information on leakage at the plug mounting hole and cracks in the test plug during the testing process. After completing the airtightness test, high and low temperature test, and durability test, the system obtains the real-time torque of the test plug and combines it with the set torque to obtain the torque attenuation rate.

[0009] The test results are obtained by analyzing and evaluating the leakage at the screw plug mounting hole, the crack condition of the test screw plug, and the torque attenuation rate.

[0010] In some embodiments, after completing the airtightness test, high and low temperature test, and durability test, the real-time torque of the test plug is obtained, and the torque attenuation rate is obtained by combining it with the set torque, including the following steps:

[0011] Remove the test fixture from the thermal shock test chamber and cool it to room temperature;

[0012] The real-time torque of all test screw plugs was obtained using a torque meter;

[0013] The difference between the set torque and the real-time torque of the test screw is used as the torque attenuation of the test screw.

[0014] Obtain the ratio of the torque attenuation of the test screw to the set torque, and use this ratio as the torque attenuation rate of the test screw.

[0015] In some embodiments, the test results are obtained by analyzing and evaluating the leakage at the plug mounting hole, the crack condition of the test plug, and the torque attenuation rate according to set rules; the set rules are:

[0016] If the test plug has no cracks, no leakage at the plug mounting hole, and the torque attenuation rate is less than or equal to the first set value, then the performance of the test plug is of the first level.

[0017] If the test plug has no cracks, no leakage at the plug mounting hole, and the torque attenuation rate is between the first and second set values, then the performance of the test plug is at the second level; the second set value is greater than the first set value.

[0018] If the test plug has no cracks, no leakage at the plug mounting hole, and the torque attenuation rate is between the second and third set values, then the performance of the test plug is at the third level; the third set value is greater than the second set value.

[0019] If the test plug has cracks, leaks at the plug mounting hole, or a torque attenuation rate greater than the third set value, the performance of the test plug is classified as level four.

[0020] In some embodiments, the airtightness test, high and low temperature test, and durability test are performed simultaneously in a thermal shock test chamber and cyclically over multiple cycles.

[0021] One of the aforementioned cycles is as follows: the first step is to test at 150℃ for 60 minutes; the second step is to test under the condition of gradually decreasing from 150℃ to -40℃ for 30 minutes; the third step is to test at -40℃ for 60 minutes; and the fourth step is to test under the condition of gradually increasing from -40℃ to 150℃ for 30 minutes.

[0022] In some embodiments, obtaining information on leakage at the plug mounting hole and cracks in the test plug during the testing process specifically includes the following steps:

[0023] Using low-temperature and high-temperature resistant camera equipment, images are taken of the screw plug mounting hole and the outer surface of the screw plug after each cycle of operation to obtain sample images;

[0024] Based on the sampled images, the leakage at the screw plug mounting hole and the crack condition of the test screw plug were obtained.

[0025] In some embodiments, the following steps are included before conducting airtightness tests and high / low temperature tests:

[0026] Install the test plug onto the test fixture and pressurize the sealed space to the test pressure through the inflation connector;

[0027] The entire test fixture was immersed in pure water, and air bubbles were checked at the screw plug mounting hole.

[0028] If air bubbles are generated, the test fixture cannot be used and a new test fixture should be replaced; otherwise, it can be used.

[0029] In some embodiments, the target operating conditions of the test plug are obtained before the medium solution is filled into the sealed space, and then the type of medium solution, the set torque, and the test pressure are determined based on the target operating conditions of the plug.

[0030] In some embodiments, the test fixture is provided with screw plug mounting holes at the top, bottom, and all four sides;

[0031] All of the aforementioned plug mounting holes are of the same size; or,

[0032] All of the described screw plug mounting holes have different dimensions; or,

[0033] Some of the screw plug mounting holes have the same size, while others have different sizes.

[0034] In some embodiments, the medium solution completely fills the sealed space; or,

[0035] The medium solution immerses the portion of the test plug cavity located at the bottom of the test fixture, as well as the lower half of the portion of the test plug cavity around the perimeter of the test fixture.

[0036] In some embodiments, the inflation connector is connected to an air pump device via a high-temperature resistant air pipe and an air valve.

[0037] The beneficial effects of the technical solution provided in this application include:

[0038] This application provides a test method for testing the performance of plastic fastening plugs. The test fixture has a plug mounting hole and an inflation connector, and an internal sealed space. After filling the test fixture with a medium solution, the plug can be installed on the fixture and then placed in a thermal shock test chamber for airtightness testing, high and low temperature testing, and durability testing. This test fixture can simulate an actual shell with a plug installed, the working medium inside the shell, and the actual installation position and torque of the plug. Ultimately, it can simulate the actual usage environment and installation state of the plug. Furthermore, since airtightness testing, high and low temperature testing, and durability testing can be performed simultaneously in the thermal shock test chamber, and evaluation and analysis can be conducted based on leakage at the plug mounting hole, cracking of the test plug, and torque attenuation rate. Therefore, it is possible to test the influence of multiple factors on plug performance at once, resulting in accurate test results. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic diagram showing that the test fixture provided in this embodiment of the application does not contain a medium solution;

[0041] Figure 2 A schematic diagram showing a medium solution within the test fixture provided in an embodiment of this application;

[0042] Figure 3 A general flowchart of the test method for testing the performance of plastic fastening plugs provided in the embodiments of this application.

[0043] In the diagram: 1. Test plug; 2. Test fixture; 3. Inflation connector. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] This application provides a test method for testing the performance of plastic fastening plugs, in order to solve the problem in related technologies that it is difficult to conduct tests simultaneously under different media solutions, different pressure states, and different temperatures, and that it is difficult to accurately evaluate the performance of plastic fastening plugs.

[0046] Please see Figures 1-3 A test method for testing the performance of plastic fastening plugs, comprising the following steps:

[0047] Step 101: Provide test fixture 2; test fixture 2 has a sealed space, and is provided with a screw plug mounting hole and an air inlet connector 3 communicating with the sealed space;

[0048] Step 102: Fill the sealed space with the medium solution and install the test plug 1 on the plug mounting hole with the set torque; apply test pressure to the sealed space through the air inlet connector 3, and then put it into the thermal shock test chamber for air tightness test, high and low temperature test and durability test;

[0049] Step 103: Obtain information on leakage at the screw plug mounting hole and cracking of test screw plug 1 during the test process; after completing the airtightness test, high and low temperature test and durability test, obtain the real-time torque of test screw plug 1 and obtain the torque attenuation rate by combining it with the set torque.

[0050] Step 104: Analyze and evaluate the leakage at the screw plug mounting hole, the crack condition of test screw plug 1, and the torque attenuation rate to obtain the test results.

[0051] Through the above steps, since the test fixture 2 has a plug mounting hole and an air inlet connector 3, and has a sealed space inside, after the medium solution is filled into the test fixture 2, the plug can be installed on the test fixture 2, and then placed in the thermal shock test chamber for airtightness test, high and low temperature test, and durability test. The test fixture 2 can simulate the shell with the actual plug installed, the working medium inside the shell, and the actual installation position and installation torque of the plug. Finally, it can simulate the actual use environment and installation state of the plug. In addition, since the airtightness test, high and low temperature test, and durability test can be carried out simultaneously in the thermal shock test chamber, the leakage at the plug mounting hole, the crack condition of the test plug, and the torque attenuation rate can be evaluated and analyzed. Therefore, the influence of multiple factors on the plug performance can be tested at one time, making the test results accurate.

[0052] In some preferred embodiments, the method for obtaining the torque attenuation rate in step 103 can refer to the following specific steps:

[0053] After completing the airtightness test, high and low temperature test, and durability test, the real-time torque of test plug 1 is obtained, and the torque attenuation rate is calculated by combining it with the set torque, including the following steps:

[0054] Remove test fixture 2 from the thermal shock test chamber and cool it to room temperature;

[0055] The real-time torque of all test screw plugs 1 was obtained using a torque meter;

[0056] The difference between the set torque and the real-time torque of test screw 1 is used as the torque attenuation of test screw 1.

[0057] Obtain the ratio of the torque attenuation of test screw 1 to the set torque, and use this ratio as the torque attenuation rate of test screw 1.

[0058] Further, in step 105, the leakage at the screw plug mounting hole, the crack condition of test screw plug 1, and the torque attenuation rate are analyzed and evaluated according to the set rules to obtain the test results; the set rules are:

[0059] If the test plug 1 has no cracks, no leakage at the plug mounting hole, and the torque attenuation rate is less than or equal to the first set value, then the performance of the test plug 1 is at the first level.

[0060] If test plug 1 has no cracks, no leakage at the plug mounting hole, and the torque attenuation rate is between the first and second set values, then the performance of test plug 1 is at the second level; the second set value is greater than the first set value; 12

[0061] If test plug 1 has no cracks, no leakage at the plug mounting hole, and the torque attenuation rate is between the second and third set values, then the performance of test plug 1 is at the third level; the third set value is greater than the second set value.

[0062] If the test plug 1 has cracks, leaks at the plug mounting hole, or a torque attenuation rate greater than the third set value, then the performance of the test plug 1 is at the fourth level.

[0063] The absence of leakage at the screw plug mounting hole means that no medium solution leaks out from the screw plug mounting hole, and there is no dripping. The above methods are used to evaluate and analyze the test screw plug to obtain an accurate performance result.

[0064] In some preferred embodiments, in step 102, the airtightness test, high and low temperature test and durability test are performed simultaneously in a thermal shock test chamber, and cyclic tests are performed in multiple cycles.

[0065] One cycle consists of: the first step is to test at 150℃ for 60 minutes; the second step is to test under the condition of gradually decreasing from 150℃ to -40℃ for 30 minutes; the third step is to test at -40℃ for 60 minutes; and the fourth step is to test under the condition of gradually increasing from -40℃ to 150℃ for 30 minutes.

[0066] Step 103 involves obtaining information on leakage at the plug mounting hole and cracks in test plug 1 during the testing process. This includes the following steps:

[0067] Using low-temperature and high-temperature resistant camera equipment, images are taken of the screw plug mounting hole and the outer surface of the screw plug after each cycle of operation to obtain sample images;

[0068] Based on the sampled images, the leakage at the screw plug mounting hole and the crack condition of test screw plug 1 were obtained. The crack condition can be examined by magnification for analysis.

[0069] In some preferred embodiments, to ensure that the mounting components installed on the test plug can be fully simulated, the sealing performance of the test fixture must be guaranteed. Therefore, before conducting the airtightness test and the high and low temperature test, or before step 101, the following steps are included:

[0070] Install the test plug 1 on the test fixture 2, and pressurize the sealed space to the test pressure through the air inflator 3;

[0071] Immerse the entire test fixture 2 in pure water and check whether air bubbles are generated at the screw plug mounting hole;

[0072] If air bubbles are generated, test fixture 2 cannot be used and a new test fixture 2 should be replaced; otherwise, it can be used.

[0073] Furthermore, before filling the sealed space with the medium solution, the target operating conditions of the test plug 1 are obtained, and then the type of medium solution, the set torque, and the test pressure are determined according to the target operating conditions of the plug; thus, the performance of the plug under different operating environments can be tested.

[0074] Furthermore, in step 102, the screw plug mounting hole can be configured in the following ways:

[0075] The test fixture 2 has screw plug mounting holes at its top, bottom, and all four sides; all screw plug mounting holes are the same size; or, all screw plug mounting holes are different sizes; or, some screw plug mounting holes are the same size, and others are different sizes. Correspondingly, the medium solution completely fills the sealed space; or, the medium solution immerses the portion of the test screw plug 1 cavity at the bottom of the test fixture 2, and the lower half of the portion of the test screw plug 1 cavity around the perimeter of the test fixture 2, thus simulating the state of the test screw plug 1 during actual use. (Refer to...) Figure 2 As shown.

[0076] Furthermore, to facilitate the inflation of the test fixture 2, the inflation connector 3 is connected to the air pump device through a high-temperature resistant air pipe and an air valve; the air pressure inside the test fixture 2 is generally set to 2 bar; the pressure setting for testing the screw plugs of different housing parts can be set according to the pressure inside the cavity of the screw plug under normal operation.

[0077] In summary, the test pressure is set according to needs, and the type and grade of the medium solution refer to the type and grade of the solution that the plug comes into contact with under operating conditions. For example, the medium liquid used for the performance test of the plug on the gearbox housing is gearbox oil; of course, it can also be chloride salts of different concentrations. Therefore, through the above methods, the effects of different concentrations of chloride salts, different chloride salt contact times, different load conditions, and different pressures on the rigidity and mechanical properties of polyamide materials can also be tested. The evaluation system is objective and accurate, and the test method is highly operable.

[0078] The following is a specific example:

[0079] Test fixture 2 is made of 6061 aluminum alloy, with a length of 300mm, a width of 200mm, a height of 150mm, and a thickness of 10mm. The wall thickness of test fixture 2 can be determined according to the cavity thickness that the specific plug is adapted to. Test plug 1 is installed on test fixture 2, and then a torque gun is used to install test plug 1 as follows: Figure 1 On the screw plug mounting hole;

[0080] To test the air tightness of the tooling, pressurize the tooling 2 with air to 2 bar through the air inflator 3 on the tooling 2, and then immerse the pressurized tooling 2 entirely in pure water to check for air bubbles; if there are no air bubbles, the tooling 2 can be used.

[0081] Place the test fixture 2 horizontally on a level operating table; open the top plug #1 or #2 of the test fixture 2, and after 5 minutes, wait for the gas inside the test fixture 2 to reach equilibrium with the external atmospheric pressure. Then, inject the medium solution through the plug mounting hole at plug #1 or #2, ensuring the solution level is between the heights of plugs #3 and #4. Figure 2 As shown; then, according to the set torque, Figure 2 The test screw 1 is twisted, and air is pressurized to 2 bar into the test fixture 2 through the air inflator 3.

[0082] The parameters of the thermal shock test chamber are set so that the test fixture 2 is subjected to a high and low temperature cycle environment of -40℃ to 150℃. One cycle consists of -40℃ to 150℃ / 30min → 150℃ / 60min → 150℃ to -40℃ / 30min → -40℃ / 60min, and a total of 50 cycles are performed. The temperature and time relationship in one cycle is shown in Table 1 below.

[0083] Table 1

[0084] Data recording: After each cycle, record whether there are cracks or other defects on the appearance of screw plugs #1 to #6.

[0085] Serial Number temperature time 1 150℃ 60min 2 150℃～-40℃ 30min 3 -40℃ 60min 4 -40℃～150℃ 30min

[0086] The solution was exposed. After 50 cycles, the test fixture 2 was removed from the atmospheric thermal shock test chamber and placed at room temperature (23℃±2℃) for 2 hours. Then, the remaining torque of fixtures 1# to 6# was measured using a torque meter. The data recording table is shown in Table 2 below.

[0087] Table 2

[0088]

[0089] The torque attenuation of the screw plug is calculated based on δN = N0 - Nn, and then the torque attenuation rate N% = N0 - Nn / N0 = δN / N0 is calculated, where N0 is the original torque of the screw plug during installation, and Nn is the remaining torque of the screw plug after 50 cycles of testing on the tooling.

[0090] Performance evaluation is shown in Table 3 below.

[0091] Table 3

[0092]

[0093] The above steps allow us to determine the performance under different media solutions, pressures, and temperatures. The evaluation system is objective and accurate, and the test method is highly operable. Furthermore, test fixture 2 has a simple structure and is easy to use, significantly reducing experimental time and improving work efficiency. It can also simulate a shell with a screw plug installed, the working medium inside the shell, and the actual installation position and torque of the screw plug. Ultimately, it can simulate the actual usage environment and installation state of the screw plug, providing a large operable testing space.

[0094] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0095] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0096] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A test method for testing the performance of plastic fastening plugs, characterized in that, It includes the following steps: Provide a test fixture (2); the test fixture (2) has a sealed space and is provided with a screw plug mounting hole and an air inlet connector (3) communicating with the sealed space; The medium solution is filled into the sealed space, and the test plug (1) is installed on the plug mounting hole with a set torque; the test pressure is applied to the sealed space through the air inlet connector (3), and then it is placed in the thermal shock test chamber for air tightness test, high and low temperature test and durability test; The leakage at the screw plug mounting hole and the cracking of the test screw plug (1) during the test process are obtained; after completing the air tightness test, high and low temperature test and durability test, the real-time torque of the test screw plug (1) is obtained, and the torque attenuation rate is obtained in combination with the set torque. The test results are obtained by analyzing and evaluating the leakage at the screw plug mounting hole, the crack condition of the test screw plug (1), and the torque attenuation rate.

2. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that, After completing the airtightness test, high and low temperature test, and durability test, the real-time torque of the test plug (1) is obtained, and the torque attenuation rate is obtained by combining it with the set torque, including the following steps: Remove the test fixture (2) from the thermal shock test chamber and cool it to room temperature; The real-time torque of all test plugs (1) was obtained using a torque meter; The difference between the set torque and the real-time torque of the test screw plug (1) is used as the torque attenuation of the test screw plug (1); Obtain the ratio of the torque attenuation of the test screw plug (1) to the set torque, and use this ratio as the torque attenuation rate of the test screw plug (1).

3. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that: The test results are obtained by analyzing and evaluating the leakage at the screw plug mounting hole, the crack condition of the test screw plug (1), and the torque attenuation rate according to the set rules; the set rules are as follows: If the test plug (1) has no cracks, there is no leakage at the plug mounting hole, and the torque attenuation rate is less than or equal to the first set value, then the performance of the test plug (1) is the first level. If the test plug (1) has no cracks, there is no leakage at the plug mounting hole, and the torque attenuation rate is between the first set value and the second set value, then the performance of the test plug (1) is the second level; the second set value is greater than the first set value. If the test plug (1) has no cracks, there is no leakage at the plug mounting hole, and the torque attenuation rate is between the second and third set values, then the performance of the test plug (1) is at the third level; the third set value is greater than the second set value. If the test plug (1) has cracks, leaks at the plug mounting hole, or the torque attenuation rate is greater than the third set value, the performance of the test plug (1) is at the fourth level.

4. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that: The airtightness test, high and low temperature test and durability test are carried out simultaneously in a thermal shock test chamber, and cyclic tests are performed in multiple cycles. One of the aforementioned cycles is as follows: the first step is to test at 150℃ for 60 minutes; the second step is to test under the condition of gradually decreasing from 150℃ to -40℃ for 30 minutes; the third step is to test at -40℃ for 60 minutes; and the fourth step is to test under the condition of gradually increasing from -40℃ to 150℃ for 30 minutes.

5. The test method for testing the performance of plastic fastening plugs as described in claim 4, characterized in that, To obtain information on leakage at the screw plug mounting hole and cracks in the test screw plug (1) during the testing process, the following steps are included: Using low-temperature and high-temperature resistant camera equipment, images are taken of the screw plug mounting hole and the outer surface of the screw plug after each cycle of operation to obtain sample images; Based on the sampled images, the leakage at the screw plug mounting hole and the crack condition of the test screw plug (1) were obtained.

6. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that, Before conducting airtightness and high / low temperature tests, the following steps are included: Install the test plug (1) on the test fixture (2) and pressurize the sealed space to the test pressure through the air inlet connector (3); Immerse the entire test fixture (2) in pure water and check whether air bubbles are generated at the screw plug mounting hole; If bubbles are generated, the test fixture (2) cannot be used and a new test fixture (2) should be replaced; otherwise, it can be used.

7. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that: Before filling the sealed space with the medium solution, the target operating conditions of the test plug (1) are obtained, and then the type of medium solution, the set torque and the test pressure are determined according to the target operating conditions of the plug.

8. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that: The test fixture (2) is provided with screw plug mounting holes at the top, bottom, and all around. All of the aforementioned screw plug mounting holes are of the same size; or, All of the described screw plug mounting holes have different dimensions; or, Some of the screw plug mounting holes have the same size, while others have different sizes.

9. The test method for testing the performance of plastic fastening plugs as described in claim 8, characterized in that: The medium solution completely fills the sealed space; or... The medium solution immerses the portion of the test plug (1) cavity located at the bottom of the test fixture (2) and the lower half of the portion of the test plug (1) cavity around the test fixture (2).

10. The test method for testing the performance of plastic fastening plugs as described in claim 1, characterized in that: The inflation connector (3) is connected to the air pump device through a high-temperature resistant air pipe and an air valve.

Images