Method and system for testing anti-slip coefficient of single-bolt connection pair

Abstract

The invention provides a method and system for testing the anti-slip coefficient of a single-bolt connection pair, and the method comprises the steps: carrying out the calibration test of a test bolt, so as to generate a calibration curve, and enabling the calibration curve to represent a relation curve between the clamping force and the elongation of the test bolt in the calibration process; connecting a test part and the test bolt according to a preset process to form a test connection pair, and measuring the pre-tightening force of the test connection pair based on the calibration curve; installing the test connection pair on a tension tester, and measuring the maximum anti-sliding force of the test connection pair; and according to the pre-tightening force and the maximum anti-slip force, calculating and generating an anti-slip coefficient of the test connection pair. The device is suitable for testing the anti-slip coefficients of single bolt connection pairs in various forms in the field of automobiles, and has the advantages of simplicity in operation and accurate data.

Description

Technical Field

[0001] The invention relates to the field of automobile technology, and in particular to a testing method and system for an anti-slip coefficient of a single bolt connection pair. Background Art

[0002] The anti-slip coefficient refers to the ratio of the maximum anti-slip force when the friction surface of the connection pair slides in a high-strength bolt connection to the preload force generated by the high-strength bolt perpendicular to the friction surface. During the development of the vehicle, when developing the fastening connection process, for the connection points that need to withstand shear force conditions, anti-slip performance is an extremely important parameter, which is directly related to the safety, reliability and durability of the vehicle. At present, there is an urgent need for a test method for the anti-slip coefficient of a single bolt connection pair suitable for the automotive field. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a testing method and system for the anti-slip coefficient of a single bolt connection pair, so as to solve the problem in the prior art of lacking a testing method for the anti-slip coefficient of a single bolt connection pair suitable for the automotive field.

[0004] To achieve the above-mentioned object and other related objects, the present invention provides a method for testing the anti-slip coefficient of a single bolt connection pair, comprising:

[0005] Performing a calibration test on the test bolt to generate a calibration curve, wherein the calibration curve represents a relationship curve between the clamping force and the elongation of the test bolt during the calibration process;

[0006] Connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on the calibration curve;

[0007] Installing the test connection pair on a tensile testing machine and measuring the maximum anti-slip force of the test connection pair; and

[0008] The anti-slip coefficient of the test connection pair is calculated and generated according to the preload force and the maximum anti-slip force.

[0009] In one embodiment of the present invention, the step of performing a calibration test on the test bolt to generate a calibration curve comprises:

[0010] Machining the test bolt and bonding the induction sheet to one end of the test bolt; and

[0011] The bonded test bolts are subjected to a calibration test to generate a calibration curve.

[0012] In one embodiment of the present invention, the step of machining the test bolt and bonding the sensor sheet to one end of the test bolt comprises:

[0013] Performing cutting processing on both ends of the test bolt to machine two parallel bolt end faces; and

[0014] The two bolt end faces are ground, and the induction sheet is bonded to one of the bolt end faces.

[0015] In one embodiment of the present invention, the step of performing a calibration test on the bonded test bolt to generate a calibration curve comprises:

[0016] Installing the bonded test bolt on the pressure sensor;

[0017] Tightening the test bolt at a preset speed until the test bolt fails, so as to generate a curve of the relationship between the clamping force and the elongation of the test bolt; and

[0018] The calibration test of the test bolt is repeated multiple times, and the calibration curve is generated by fitting the generated multiple clamping force and elongation relationship curves.

[0019] In one embodiment of the present invention, the step of connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on the calibration curve includes:

[0020] Connecting the test part and the test bolt according to a preset process and tightening them to form the test connection pair; and

[0021] An ultrasonic length meter is used to measure the elongation of the test bolt in the test connection pair, and the preload force is calculated based on the calibration curve and the elongation.

[0022] In one embodiment of the present invention, in the step of connecting the test part and the test bolt according to a preset process and tightening them to form a test connection pair, a sliding displacement is reserved at the connection between the test part and the test bolt.

[0023] In one embodiment of the present invention, the step of installing the test connection pair on a tensile testing machine and measuring the maximum anti-slip force of the test connection pair comprises:

[0024] Installing the test connection pair on a tensile testing machine; and

[0025] The test connection pair is stretched or compressed at a preset rate to measure the maximum anti-slip force of the test connection pair.

[0026] In one embodiment of the present invention, in the step of calculating and generating the anti-slip coefficient of the test connection pair according to the preload force and the maximum anti-slip force, the anti-slip coefficient satisfies the following formula:

[0027]

[0028] Wherein, μ represents the anti-slip coefficient of the test bolt, N represents the maximum anti-slip force, and P represents the preload force.

[0029] In one embodiment of the present invention, before the step of performing a calibration test on the test bolt to generate a calibration curve, the method includes:

[0030] Check whether the test parts and the test bolts meet the requirements of the design drawings.

[0031] The present invention also provides a testing system for the anti-slip coefficient of a single bolt connection pair, comprising:

[0032] A curve calibration module, used for performing a calibration test on a test bolt to generate a calibration curve, wherein the calibration curve represents a relationship curve between a clamping force and an elongation of the test bolt during the calibration process;

[0033] A connection test module, used for connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on the calibration curve;

[0034] A tension testing module, used to install the test connection pair on a tension testing machine and measure the maximum anti-slip force of the test connection pair; and

[0035] The coefficient calculation module is used to calculate and generate the anti-slip coefficient of the test connection pair according to the preload force and the maximum anti-slip force.

[0036] As described above, a testing method and system for the anti-slip coefficient of a single-bolt connection pair of the present invention have the following beneficial effects: the present invention is suitable for the anti-slip coefficient testing of single-bolt connection pair samples of various forms in the automotive field, and has the advantages of strong targeting, wide application range, high testing efficiency and accurate data. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Shown is a schematic flow chart of a method for testing the anti-slip coefficient of a single bolt connection pair provided by the present invention.

[0038] Figure 2 Display as Figure 1 A flowchart of a specific implementation of step S100 is shown in FIG.

[0039] Figure 3 Display as Figure 2 A flowchart of a specific implementation of step S110 in FIG.

[0040] Figure 4 It is a schematic diagram showing a test of a bolt-bonded sensor sheet according to an embodiment of the present invention.

[0041] Figure 5 Display as Figure 2 A flowchart of a specific implementation of step S120 in FIG.

[0042] Figure 6 Shown is a schematic diagram of a calibration curve formed by fitting in one embodiment of the present invention.

[0043] Figure 7 Display as Figure 1 A flowchart of a specific implementation of step S200 is shown in FIG.

[0044] Figure 8 Display as Figure 1 A flowchart of a specific implementation of step S300 is shown in FIG.

[0045] Fig. 9 Shown is a schematic diagram of an anti-slip curve of a tested bolt according to an embodiment of the present invention.

[0046] Fig.10 Shown is a schematic diagram of a testing system for the anti-slip coefficient of a single bolt connection pair provided by the present invention. DETAILED DESCRIPTION

[0047] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0048] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0049] See also Figures 1 to 10 The present invention provides a method and system for testing the anti-slip coefficient of a single bolt connection pair, which relates to the field of automobile technology and can be specifically applied to testing the anti-slip coefficient of a single bolt connection pair such as a ball pin and a stabilizer bar in the automobile field. The present invention can test the anti-slip coefficient of a specific connection point in the automobile field, and the test range is more targeted and applicable. The following is a detailed description through specific embodiments.

[0050] See also Figure 1 , Figure 1 The flowchart of the method for testing the anti-slip coefficient of a single bolt connection provided by the present invention may include the following steps:

[0051] Step S100, performing a calibration test on the test bolt to generate a calibration curve, wherein the calibration curve represents a relationship curve between the clamping force and the elongation of the test bolt during the calibration process;

[0052] Step S200, connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on a calibration curve;

[0053] Step S300, installing the test connection pair on a tensile testing machine, and measuring the maximum anti-slip force of the test connection pair;

[0054] Step S400: Calculate and generate the anti-slip coefficient of the test connection pair according to the preload force and the maximum anti-slip force.

[0055] See also Figure 2 , Figure 2 Display as Figure 1In one embodiment of the present invention, when step S100 is executed, a calibration test is performed on the test bolt to generate a calibration curve, which represents the relationship between the clamping force and the elongation of the test bolt during the calibration process. Step S100 may include steps S110 to S120, which are described in detail as follows:

[0056] Step S110, machining the test bolt and bonding the sensor sheet to one end of the test bolt;

[0057] Step S120: performing a calibration test on the bonded test bolt to generate a calibration curve.

[0058] See also Figure 3 , Figure 3 Display as Figure 2 In one embodiment of the present invention, when executing step S110, the test bolt is machined and the induction sheet is bonded to one end of the test bolt. Step S110 may include steps S111 to S112, which are described in detail as follows:

[0059] Step S111, cutting and processing are performed on both ends of the test bolt to obtain two parallel bolt end faces;

[0060] Step S112: Grind the two bolt end faces and bond the sensor sheet to one bolt end face.

[0061] See also Figure 4 , Figure 4It is a schematic diagram of the test bolt bonding sensing sheet in one embodiment of the present invention. In one embodiment of the present invention, when executing steps S111 to S112. Specifically, first, the two ends of the test bolt 100 are plane-cut using a CNC machine tool so that the two bolt end faces 101 are parallel after processing. Then, the two bolt end faces 101 are ground using a grinding wheel or sandpaper to reduce the roughness of the two bolt end faces 101. Finally, a small amount of adhesive is dripped on the sensing sheet 200, and the sensing sheet 200 with the adhesive surface is pressed on one end of the test bolt 100; a magnet is used to adsorb on the test bolt 100 to keep pressing the sensing sheet 200 for at least 1 minute, and then an alcohol cotton ball is used to wipe off the excess colloid. The sensing sheet 200 can be a piezoelectric ceramic sheet. In this embodiment, in order to ensure the accuracy of the ultrasonic measurement data, the parallelism of the two bolt end faces 101 after processing can be required to be within 0.2 mm, and the roughness of the two bolt end faces 101 after processing can be required to be not higher than Ra1.6. It can be seen that the present invention uses ultrasonic wave to measure the preload force, and the test bolt 100 only needs to use a lathe to perform plane machining on both ends, and the adhesive sensor sheet 200 is convenient and quick. The sensor sheet 200 can be attached to either end of the test bolt 100, and the test bolt 100 model may include a fully threaded bolt or a bare rod bolt. The sensor sheet 200 and the wire can be connected by magnetic attraction, and the load and acoustic wave time difference data during the tightening process are automatically collected and recorded during the calibration process. Among them, the load is the clamping force generated by the test bolt, and the acoustic wave time difference data can be used to calculate the elongation of the test bolt 100, thereby generating a relationship curve between the clamping force and the elongation. The stress conditions of the calibration process in the present invention are consistent with the stress conditions during actual assembly. The calibration process starts when the bolt is not stressed and ends when the bolt fails. At the end of the calibration, the software automatically fits the calibration curve.

[0062] See also Figure 5 , Figure 5 Display as Figure 2 In one embodiment of the present invention, when step S120 is executed, a calibration test is performed on the bonded test bolt to generate a calibration curve. Step S120 may include steps S121 to S123, which are described in detail as follows:

[0063] Step S121, installing the bonded test bolt on the pressure sensor;

[0064] Step S122, tightening the test bolt at a preset speed until the test bolt fails, so as to generate a curve of the relationship between the clamping force and the elongation of the test bolt;

[0065] Step S123, repeat the calibration test of the test bolt multiple times, and fit the generated multiple clamping force and elongation relationship curves to generate a calibration curve.

[0066] See also Figure 6 , Figure 6 A schematic diagram of a calibration curve formed by fitting in an embodiment of the present invention is shown. In one embodiment of the present invention, when steps S121 to S123 are executed. Specifically, a calibration test is performed on the test bolt. First, the test bolt with the bonding sensor is installed on the pressure sensor. The clamping length of the test bolt on the pressure sensor must be consistent with the clamping length of the actual connection point applied to the car, so as to simulate the actual force condition. Then, the test bolt is tightened at a preset speed using a tightening gun until the test bolt fails. In the above process, the pressure sensor can generate a curve of the relationship between the clamping force and the elongation of the test bolt. Finally, the stress test of the test bolt is repeated many times to generate multiple valid curves of the relationship between the clamping force and the elongation; and then the multiple valid curves of the relationship between the clamping force and the elongation are fitted by software to generate a calibration curve of the test bolt of this type. The calibration curve can characterize the curve of the relationship between the clamping force and the elongation generated by the test bolt of this type during the calibration process. In this embodiment, the preset speed can be between 2rpm and 10rpm. The calibration test must be repeated no less than 3 times.

[0067] The present invention adopts ultrasonic measurement to measure the relationship curve between the clamping force and elongation of the bolt, which has the advantages of simple operation and high data reliability. The ultrasonic measurement equipment can be composed of a pulse generator, a temperature sensor, measurement and analysis software, an ultrasonic pickup sensor and a cable. The axial load of the bolt is proportional to the elongation when the bolt is tightened. The time difference of ultrasonic wave propagation in the direction of the axial force in the bolt medium is used to realize the calculation of the clamping force based on the axial deformation and its corresponding relationship, which can improve the measurement accuracy. In addition, by using ultrasonic wave to measure the clamping force, the tensile force and the shear force along the friction direction of the bolt are tested in the calibration stage, which is consistent with the actual force conditions of the bolt tightening process, and can further improve the data accuracy.

[0068] See also Figure 7 As shown, Figure 7 Display as Figure 1 In one embodiment of the present invention, when step S200 is executed, the test part and the test bolt are connected to form a test connection pair, and the preload force of the test bolt is measured based on the calibration curve. Step S200 may include steps S210 to S220, which are described in detail as follows:

[0069] Step S210, connecting the test part and the test bolt according to a preset process and tightening them to form a test connection pair;

[0070] Step S220: Use an ultrasonic length measuring instrument to measure the elongation of the test bolt in the test connection pair, and calculate the preload force based on the calibration curve and the elongation.

[0071] In one embodiment of the present invention, the test part refers to the automotive part connected by the test bolt, which can be cut and processed according to the test requirements. In this embodiment, the test part can adopt a flexible sampling method for the characteristics of numerous connection points, various shapes, various contact surface treatment methods, and a wide variety of bolts in the whole vehicle. The cutting and processing of the test part needs to facilitate the tightening and assembly of the test bolt on the one hand, and on the other hand, it needs to be convenient to fix it on the existing test tooling for compression or tension testing. Due to the numerous bolt connection positions and various shapes in the automotive field, a flexible sampling method is adopted for the sample, which expands the scope of application of the test. The test tooling is a span adjustable tooling designed according to the size of the connection point, which can be applied to the anti-slip coefficient test of connection points of different sizes. Before executing step S100, it is necessary to detect whether the test parts and test bolts meet the requirements of the design drawings. For example, the properties of the test part size, surface state, material grade, etc. should meet the requirements of the drawings, and the tensile strength, yield strength, guaranteed load, friction coefficient and other property indicators of the test bolts should meet the requirements of the drawings.

[0072] In one embodiment of the present invention, when executing step S210 to step S220. Specifically, first, according to the design process of the preset connection point, the test bolt is installed on the test part, and the test bolt is tightened to form a test connection pair for compression or tension testing. It should be noted that the present invention reserves a sliding gap at the connection between the test bolt and the test part, that is, there is a certain gap between the test bolt and the bolt hole of the test part, so that there is enough space for sliding when performing tension / compression testing.

[0073] Furthermore, after completing the tightening of the test bolt, it is necessary to use an ultrasonic length gauge to test the preload force P of the connection point. First, use an ultrasonic length gauge to measure the elongation of the test bolt in the test connection pair; then, calculate the preload force P based on the calibration curve and the measured elongation. It should be noted that for the preload force test of soft connections or certain easily attenuated connection points, it is necessary to monitor the attenuation of the preload force, and then test the anti-slip coefficient after the preload force stabilizes. The actual result of the preload force is calculated based on the final attenuated preload force. In this embodiment, the ultrasonic length gauge and the bolt can be connected by magnetic attraction, which is convenient and quick.

[0074] See also Figure 8 , Figure 8 Display as Figure 11 is a flow chart of a specific implementation of step S300 in the embodiment of the present invention. In one embodiment of the present invention, when step S300 is executed, the test connection pair is installed on the tensile testing machine, and the maximum anti-slip force of the test connection pair is measured. Step S300 may include steps S310 to S320, which are described in detail as follows:

[0075] Step S310, installing the test connection pair on the tensile testing machine;

[0076] Step S320: stretch or compress the test connection pair at a preset rate to measure the maximum anti-slip force of the test connection pair.

[0077] In one embodiment of the present invention, when steps S310 to S320 are executed. Specifically, first, the test connection pair formed in step S300 is installed on a tensile testing machine. And according to the test connection pair and the test tooling connected to it, a tensile test or a compression test is reasonably selected. Then, the test connection pair is stretched or compressed at a preset rate using a tensile testing machine. In this embodiment, the preset rate of stretching or compression may be in the range of 0.5 mm / min to 5 mm / min. At the same time, the anti-slip curve of the test bolt is generated by recording the computer connected to the tensile testing machine.

[0078] See also Fig. 9 , Fig. 9 Shown is a schematic diagram of the anti-slip curve of the test bolt in one embodiment of the present invention. In one embodiment of the present invention, the tensile testing machine performs a tensile test or a compression test on the test connection pair. As the load of the tensile testing machine is applied, the test connection pair will bear the corresponding load. When the load gradually increases to the maximum anti-slip force of the test connection pair, at this time, the test bolt and the test part will change from static friction to dynamic friction, and the tensile testing machine will detect that the load suddenly decreases. The above process will form a tip on the anti-slip curve of the test bolt, and the highest point of the tip of the curve is also the maximum anti-slip force N.

[0079] In one embodiment of the present invention, when step S400 is executed, the anti-slip coefficient of the test connection pair is calculated based on the preload force and the maximum anti-slip force. Specifically, the anti-slip coefficient of the test bolt can be calculated based on the preload force measured in step S220 and the maximum anti-slip force generated in step S320. In this embodiment, the anti-slip coefficient of the test bolt can satisfy the following formula:

[0080]

[0081] Among them, μ represents the anti-slip coefficient of the test bolt, N represents the maximum anti-slip force, and P represents the preload force.

[0082] Further, steps S200 to S400 are repeatedly performed to test multiple groups of test bolts of the same model to obtain a sample size that meets the requirements. In this way, the anti-slip coefficient of the test bolts with reliable data can be obtained.

[0083] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0084] See also Fig.10 The present invention also provides a testing system for the anti-slip coefficient of a single bolt connection pair, which corresponds to the testing method in the above embodiment. The testing system may include a curve calibration module 300, a connection test module 400, a tension test module 500 and a coefficient calculation module 600. The functional modules are described in detail as follows:

[0085] The curve calibration module 300 can be used to perform calibration tests on the test bolts to generate a calibration curve, which represents the relationship curve between the clamping force and the elongation of the test bolts during the calibration process. Further, first, the curve calibration module 300 performs cutting processing on both ends of the test bolt to process two parallel bolt end faces; and grinds the two bolt end faces, and bonds the sensor sheet to one bolt end face; then, the curve calibration module 300 installs the bonded test bolt on the pressure sensor; tightens the test bolt at a preset speed until the test bolt fails, so as to generate a relationship curve between the clamping force and the elongation of the test bolt; and repeats the calibration test of the test bolt multiple times, and fits the generated multiple relationship curves between the clamping force and the elongation to generate a calibration curve.

[0086] The connection test module 400 can be used to connect the test part and the test bolt according to a preset process to form a test connection pair, and measure the preload force of the test connection pair based on the calibration curve. Further, the connection test module 400 can be specifically used to connect the test part and the test bolt according to the preset process and tighten them to form a test connection pair; and use an ultrasonic length meter to measure the elongation of the test bolt in the test connection pair, and calculate the preload force based on the calibration curve and the elongation.

[0087] The tension test module 500 can be used to install the test connection pair on the tension test machine and measure the maximum anti-slip force of the test connection pair. Further, the tension test module 500 can be specifically used to install the test connection pair on the tension test machine; and to stretch or compress the test connection pair at a preset rate to measure the maximum anti-slip force of the test connection pair.

[0088] The coefficient calculation module 600 can be used to calculate the anti-slip coefficient of the test connection pair according to the preload and the maximum anti-slip force. Specifically, the coefficient calculation module 600 can calculate the anti-slip coefficient of the test bolt according to the preload measured by the connection test module 400 and the maximum anti-slip force measured by the tension test module 500. In this embodiment, the anti-slip coefficient of the test bolt can satisfy the following formula:

[0089]

[0090] Among them, μ represents the anti-slip coefficient of the test bolt, N represents the maximum anti-slip force, and P represents the preload force.

[0091] For the specific definition of the test system, please refer to the definition of the test method above, which will not be repeated here. Each module in the above test system can be implemented in whole or in part by software, hardware and their combination. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0092] In summary, the present invention provides a method and system for testing the anti-slip coefficient of a single bolt connection pair, which is suitable for testing the anti-slip coefficient of single bolt connection pair samples of various forms in the automotive field, and has the advantages of strong pertinence, wide application range, high testing efficiency and accurate data. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0093] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for testing the anti-slip coefficient of a single bolt connection pair, characterized in that: include: Performing a calibration test on the test bolt to generate a calibration curve, wherein the calibration curve represents a relationship curve between the clamping force and the elongation of the test bolt during the calibration process; Connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on the calibration curve; Installing the test connection pair on a tensile testing machine, and measuring the maximum anti-slip force of the test connection pair; as well as The anti-slip coefficient of the test connection pair is calculated and generated according to the preload force and the maximum anti-slip force.

2. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 1, characterized in that: The step of performing a calibration test on the test bolt to generate a calibration curve comprises: Machining the test bolt and bonding the induction sheet to one end of the test bolt; and The bonded test bolts are subjected to a calibration test to generate a calibration curve.

3. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 2, characterized in that: The step of machining the test bolt and bonding the sensor sheet to one end of the test bolt includes: Performing cutting processing on both ends of the test bolt to machine two parallel bolt end faces; and The two bolt end faces are ground, and the induction sheet is bonded to one of the bolt end faces.

4. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 2, characterized in that: The step of performing a calibration test on the bonded test bolt to generate a calibration curve comprises: Installing the bonded test bolt on the pressure sensor; Tightening the test bolt at a preset speed until the test bolt fails, so as to generate a curve of the relationship between the clamping force and the elongation of the test bolt; and The calibration test of the test bolt is repeated multiple times, and the calibration curve is generated by fitting the generated multiple clamping force and elongation relationship curves.

5. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 1, characterized in that: The step of connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on the calibration curve includes: Connecting the test part and the test bolt according to a preset process and tightening them to form the test connection pair; and An ultrasonic length meter is used to measure the elongation of the test bolt in the test connection pair, and the preload force is calculated based on the calibration curve and the elongation.

6. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 5, characterized in that: In the step of connecting the test part and the test bolt according to a preset process and tightening them to form a test connection pair, a sliding displacement is reserved at the connection between the test part and the test bolt.

7. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 1, characterized in that: The step of installing the test connection pair on a tensile testing machine and measuring the maximum anti-slip force of the test connection pair comprises: Installing the test connection pair on a tensile testing machine; and The test connection pair is stretched or compressed at a preset rate to measure the maximum anti-slip force of the test connection pair.

8. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 1, characterized in that: In the step of calculating and generating the anti-slip coefficient of the test connection pair according to the preload force and the maximum anti-slip force, the anti-slip coefficient satisfies the following formula: Wherein, μ represents the anti-slip coefficient of the test bolt, N represents the maximum anti-slip force, and P represents the preload force.

9. The method for testing the anti-slip coefficient of a single bolt connection pair according to claim 1, characterized in that: Before the step of performing a calibration test on the test bolt to generate a calibration curve, the method includes: Check whether the test parts and the test bolts meet the requirements of the design drawings.

10. A testing system for the anti-slip coefficient of a single bolt connection, characterized in that: include: A curve calibration module, used for performing a calibration test on a test bolt to generate a calibration curve, wherein the calibration curve represents a relationship curve between a clamping force and an elongation of the test bolt during the calibration process; A connection test module, used for connecting the test part and the test bolt according to a preset process to form a test connection pair, and measuring the preload force of the test connection pair based on the calibration curve; A tension test module, used to install the test connection pair on a tension testing machine and measure the maximum anti-slip force of the test connection pair; as well as The coefficient calculation module is used to calculate and generate the anti-slip coefficient of the test connection pair according to the preload force and the maximum anti-slip force.

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