Patch device, durable road test bolt and durability test method of durable road test bolt

Abstract

The invention discloses a surface mounting device, a durable road test bolt and a durability test method thereof, the surface mounting device comprises a fixing assembly and a positioning piece, the fixing assembly comprises a fixing disc and a plurality of clamping pieces movably arranged on the fixing disc, the fixing disc is provided with a center position, and the plurality of clamping pieces are used for fixing a bolt to be subjected to surface mounting at the center position; the positioning piece is movably arranged on the fixing disc in the axis direction of the bolt fixed to the center position, a positioning hole is formed in the positioning piece, the positioning hole is suitable for being centered with the axis of the bolt fixed to the center position, and the positioning hole is suitable for being matched with the patch in shape. The bolt to be subjected to surface mounting is fixed by arranging the fixing assembly, the positioning hole in the positioning piece is aligned with the axis of the bolt, surface mounting is conducted on the bolt through the positioning hole during surface mounting, so that the alignment precision of surface mounting is guaranteed, the detection precision of the bolt is guaranteed, and then the accuracy of a subsequent test result is greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of bolt testing, and in particular relates to a patch device, a durability road test bolt and a durability testing method thereof. Background Art

[0002] The axial force test of tightened connecting bolts - the ultrasonic piezoelectric ceramic patch method has been widely used in the automotive industry for data accumulation in the design and development stage and for general assembly process guidance. It is used to determine whether the axial force of the connection meets the design and use requirements. However, the ultrasonic piezoelectric ceramic patch (hereinafter referred to as the ultrasonic patch) needs to be attached to the center of the bolt end face to ensure its detection accuracy. Poor centering effect has a great influence on the test results. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a patch device, a durable road test bolt and a durability test method thereof to ensure the centering of the ultrasonic patch and improve the accuracy of the bolt durability test data.

[0004] In a first aspect, the present application provides a patch device, comprising:

[0005] A fixing assembly, comprising a fixing plate and a plurality of clamping members movably arranged on the fixing plate, wherein a center position is provided on the fixing plate, and the plurality of clamping members are used to fix the bolts to be patched at the center position;

[0006] The positioning piece is movably arranged on the fixed plate along the axis direction of the bolt fixed at the center position. The positioning piece is provided with a positioning hole, which is suitable for being aligned with the axis of the bolt fixed at the center position and matching the shape of the ultrasonic patch.

[0007] According to the patch device of the present application, the bolt to be patched is fixed by setting a fixing component, and the positioning hole on the positioning piece is aligned with the axis of the bolt. When patching, the patch is pasted on the bolt through the positioning hole to ensure the centering accuracy of the patch and the detection accuracy of the bolt, thereby greatly improving the accuracy of subsequent test results.

[0008] According to one embodiment of the present application, a guide member is provided on the fixed plate, and the positioning member is movably arranged along the extension direction of the guide member and can be limited when it moves close to the bolt fixed at the center position.

[0009] According to an embodiment of the present application, the guide member includes a guide rod, the positioning member is provided with a guide hole, the guide hole is sleeved outside the guide rod, and the positioning member is provided with a positioning screw that can penetrate into the guide hole.

[0010] According to an embodiment of the present application, the guide rod is arranged on one side of the center position, one end of the positioning member is provided with a guide hole, and the other end extends in a direction close to the center position and is provided with a positioning hole.

[0011] According to an embodiment of the present application, the cross-section of the guide rod is a polygonal arrangement, and the cross-section of the guide hole matches the cross-section shape of the guide rod.

[0012] According to an embodiment of the present application, a plurality of clamping members are distributed around the center position and are movably arranged in directions approaching and away from the center position.

[0013] According to one embodiment of the present application, a plurality of positioning members are provided, and the positioning holes of the plurality of positioning members have different sizes. The positioning holes of different sizes are suitable for corresponding to bolts of different types. The positioning members corresponding to the bolts to be mounted are selected and arranged on the fixing plate.

[0014] In a second aspect, the present application provides a durable road test bolt, the durable road test bolt comprising:

[0015] Bolt body;

[0016] An ultrasonic patch is mounted on the center of the head end face of the bolt body by a patch device according to any technical solution in the first aspect;

[0017] The protective piece is arranged on the side of the patch away from the nut.

[0018] According to the durable road test bolt of the present application, the ultrasonic patch is mounted on the center position of the end face of the bolt body head through a patch device to ensure the centering degree of the ultrasonic patch and improve the accuracy of the ultrasonic patch detection data. In addition, by providing a protective part, the ultrasonic patch is well protected during the road test to prevent the ultrasonic patch and the bolt end face from colliding and stains from sticking, thereby enhancing the surface corrosion resistance of the parts and improving the success rate and accuracy of the test.

[0019] According to one embodiment of the present application, the protective element includes:

[0020] A film, one side of the film is sticky, and the sticky side of the film is bonded to the end surface of the head;

[0021] The protective sheet is arranged between the film and the ultrasonic patch, and the projection of the ultrasonic patch in the axial direction of the bolt body is located inside the protective sheet.

[0022] In a third aspect, the present application provides a durability test method for a durable road test bolt according to any technical solution in the second aspect, the durability test method comprising:

[0023] S1. Install the bolt body with patch on the durability test vehicle according to the tightening process and make markings;

[0024] S2. Test the axial force of the bolt body after tightening and save the axial force data;

[0025] S3. Select the size of the protective sheet according to the diameter of the end face of the bolt head, and stick the protective sheet to the end face of the bolt head;

[0026] S4, dividing the total endurance test mileage into multiple sections, and after each section of mileage, uncovering the protective parts, conducting an axial force test, pasting the protective parts back after the measurement, and saving the axial force data in sequence;

[0027] S5. After the endurance test, loosen and test the axial force data of the endurance road test bolts to determine the elongation deformation of the bolt body;

[0028] S6. Analyze the reliability of the fastening connection of the durability road test bolts based on the axial force data and elongation deformation.

[0029] According to the durability test method of the present application, various measurement data of the durability road test bolts during the road test can be effectively obtained, and the test process is reasonable, clear and definite, ensuring the accuracy of the test data and test results.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 is a schematic diagram of the structure of the patch device provided in an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the matching structure of the patch device and the bolt provided in the embodiment of the present application;

[0034] Figure 3 is a schematic diagram of the structure of the positioning member provided in an embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of the matching structure of the bolt body, ultrasonic patch and protective member provided in the embodiment of the present application;

[0036] Figure 5 It is a flow chart of the durability testing method provided in the embodiment of the present application.

[0037] Reference numerals:

[0038] 100, patch device; 110, fixing assembly; 111, fixing plate; 1111, center position; 112, clamping member; 120, positioning member; 121, guide hole; 122, positioning hole; 130, guide member; 140, positioning screw;

[0039] 200. Durable road test bolt; 210. Bolt body; 211. Head end face; 220. Ultrasonic patch; 230. Protective part; 231. Film; 232. Protective sheet. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0041] Every year, domestic and foreign automobiles experience quality accidents or vehicle recalls due to the failure of bolt fastening connections. Therefore, major automobile companies are gradually establishing the forward development capabilities of bolt fasteners. An important part of this is the development and verification of bolt tightening processes, which is used to reduce quality problems such as loosening, abnormal noise, and breakage of bolt fastening connections, and improve vehicle reliability. An important reason for the failure of bolt fastening connections is insufficient axial force (clamping force).

[0042] Axial force test of fastening bolts - ultrasonic piezoelectric ceramic method has been widely used in the automotive industry for data accumulation and assembly process guidance in the design and development stage. Tightening process development and verification will use ultrasonic axial force testers to measure the axial force of bolt fastening connections in key parts of the car to determine whether the axial force of the connection meets the design and use requirements.

[0043] During the ultrasonic axial force test, an ultrasonic piezoelectric ceramic sheet (hereinafter referred to as ultrasonic patch) needs to be attached to the ground bolt end face for accurate transmission and reception of ultrasonic signals. The test requires that the bolt end face should be smooth and have a low roughness value after being ground, and have good verticality with the rod. The piezoelectric ceramic sheet should have no stains or damage on the surface, and the bonding position should be located at the center of the end face. Therefore, how to accurately attach the ultrasonic patch to the center of the bolt is a key issue that needs to be solved urgently.

[0044] Based on the above considerations, the present application provides a patch device to ensure the centering degree of the ultrasonic patch and improve the accuracy of the bolt durability test data.

[0045] Reference below Figure 1-Figure 3 A patch device, a durability road test bolt and a durability test method thereof according to an embodiment of the present application are described.

[0046] See also Figure 1 and Figure 2 An embodiment of the present application provides a patch device 100 , which includes a fixing component 110 and a positioning member 120 .

[0047] The fixing assembly 110 includes a fixing disk 111 and a plurality of clamping members 112 movably disposed on the fixing disk 111 . A center position 1111 is disposed on the fixing disk 111 . The plurality of clamping members 112 are used to fix the bolts to be mounted at the center position 1111 .

[0048] The fixing assembly 110 is composed of a fixing plate 111 and a plurality of clamping members 112. The fixing plate 111 is the base of the patch device 100 and is usually made of a solid material, such as metal or high-strength plastic, to ensure stability during use. The fixing plate 111 can be round or square, etc., and the specific shape is not limited. In an example, Figure 1 and Figure 2 As shown, the fixing plate 111 is a circular plate. A mounting hole may be provided at the center position 1111 of the fixing plate 111 for positioning and installing the bolts. The center position 1111 of the fixing plate 111 may refer to the geometric center position 1111 of the fixing plate 111, so as to facilitate the arrangement of the clamping member 112 and the centering positioning of the bolts, and improve the accuracy of assembly. For example, if the fixing plate 111 is circular, the center position 1111 of the fixing plate 111 may be the center position of the circle.

[0049] The clamping member 112 is used to fix the bolt at the center position 1111 of the fixing plate 111. These clamping members 112 can be mechanical clamps, magnetic adsorption devices or other forms of fastening devices, and their design should ensure that the bolt will not be displaced during the patch process.

[0050] The positioning member 120 is movably arranged on the fixed plate 111 along the axial direction of the bolt fixed at the center position 1111. A positioning hole 122 is provided on the positioning member 120. The positioning hole 122 is suitable for being aligned with the axis of the bolt fixed at the center position 1111. The positioning hole 122 is suitable for matching the shape of the ultrasonic patch 220.

[0051] The positioning member 120 is a key part of the patch device 100. It can be movably arranged along the axis direction of the bolt on the fixed plate 111 to ensure that during the movement of the positioning member 120, the positioning hole 122 arranged thereon always remains aligned with the axis of the bolt. By setting the positioning member 120 to be movable, it is convenient for the assembly and disassembly of the bolt. The positioning member 120 is provided with a positioning hole 122, the size and shape of which match the ultrasonic patch 220. The design of the positioning hole 122 ensures that the patch can be accurately aligned with the axis of the bolt when placed, and through the constraint of the movable direction of the positioning member 120, the positioning hole 122 is always aligned in the axis direction of the bolt, reducing the generation of errors.

[0052] In actual implementation, first, insert the bolt to be patched into the center position 1111 of the fixing disk 111, and fix the bolt by the clamping member 112 to ensure that the bolt will not rotate or move during the patch process. According to the size and shape of the bolt, adjust the position of the positioning member 120 so that the positioning member 120 is close to the end face of the bolt, and align the positioning hole 122 with the axis of the bolt, and place the ultrasonic patch 220 in the positioning hole 122. Since the positioning hole 122 matches the shape of the patch, the patch is naturally centered. Once the position of the patch is confirmed to be correct, use an appropriate adhesive or other fixing method to fix the patch on the end face of the bolt to ensure that the patch will not fall off during subsequent use. The entire patch process is simple to operate and has high centering accuracy, making the ultrasonic signal more stable and reducing the error in ultrasonic propagation time, thereby greatly improving the accuracy of subsequent test results.

[0053] According to the patch device 100 of the present application, the bolt to be patched is fixed by setting a fixing component 110, and the positioning hole 122 on the positioning member 120 is aligned with the axis of the bolt. When patching, the patch is pasted on the bolt through the positioning hole 122 to ensure the centering accuracy of the patch and the detection accuracy of the bolt, thereby greatly improving the accuracy of subsequent test results.

[0054] See also Figure 1 and Figure 2 According to some embodiments of the present application, a guide member 130 may be provided on the fixed plate 111, and the positioning member 120 may be movably arranged along the extension direction of the guide member 130, and may be limited when it moves close to the bolt fixed at the center position 1111.

[0055] The main function of the guide member 130 is to guide the positioning member 120 to move along the axis direction of the bolt on the fixed disk 111, and to provide a limiting function when the positioning member 120 is close to the bolt, so as to ensure the precise position and stability of the positioning member 120. The guide member 130 can be in the form of a guide rail, a guide column or a guide groove, and its structure should be strong and wear-resistant to ensure reliability in long-term use. The material of the guide member 130 can be metal or high-strength plastic, and the surface can be hardened to increase wear resistance. The guide member 130 is fixed on the fixed disk 111, and can be integrally formed, or installed by bolts, welding or other fixing methods. The position and number of the guide member 130 can be determined according to the design of the fixed disk 111 and the movement requirements of the positioning member 120.

[0056] The positioning member 120 can be movably arranged along the extension direction of the guide member 130, and can be a sliding, rotating or other form of movement. This movement should ensure that the positioning member 120 can move smoothly and accurately to the axial position of the bolt. When the positioning member 120 moves close to the bolt fixed at the center position 1111, a limiting function can be provided between the guide member 130 and the positioning member 120 to prevent the positioning member 120 from excessive movement or deviation from the axis. The limiting function can be mechanical, such as a limiting block or a limiting groove, or electronic, such as sensor detection.

[0057] In some examples, the operator can manually or automatically adjust the position of the positioning member 120. In other examples, in an automatic system, a stepper motor, a servo motor, etc. can be used to accurately control the movement of the positioning member 120.

[0058] In actual implementation, after the bolt is fixed at the center position 1111 of the fixing plate 111, the operator or the automatic system moves the positioning member 120 along the guide member 130 to the axial position of the bolt. When the positioning member 120 moves near the bolt, the positioning member 120 is limited relative to the guide member 130 to ensure that the positioning member 120 does not collide with the bolt or deviate from the predetermined position.

[0059] See also Figures 1 to 3 According to some embodiments of the present application, the guide member 130 may include a guide rod, the positioning member 120 may be provided with a guide hole 121, the guide hole 121 may be sleeved outside the guide rod, and the positioning member 120 is provided with a positioning screw 140 that can penetrate into the guide hole 121.

[0060] The guide rod provides a precise path so that the positioning member 120 can move smoothly along the axis of the bolt. The guide rod can be cylindrical or square, etc. Its size and shape are designed to ensure that the guide hole 121 on the positioning member 120 can be tightly fitted outside it. The material of the guide rod can be selected from high-strength and wear-resistant materials, such as stainless steel or aluminum alloy, to ensure stability and durability for long-term use.

[0061] The guide hole 121 on the positioning member 120 is used to set the guide rod to ensure that the positioning member 120 moves accurately along the extension direction of the guide rod. The positioning screw 140 is used to fix the position of the positioning member 120 on the guide rod to ensure the stability of the positioning member 120 during the patch process. The positioning screw 140 can be a standard threaded screw, and its threaded portion is designed to cooperate with the threaded hole on the positioning member 120. The head of the positioning screw 140 can be a flat head, a hexagonal head or other shapes for easy operation. The positioning screw 140 can be rotatably mounted on the positioning member 120, and can pass through the positioning member 120 to the guide hole 121 to abut against the guide member 130 for limiting. When the position of the positioning member 120 needs to be adjusted, the positioning screw 140 can be loosened, the positioning member 120 is moved, and then the positioning screw 140 can be tightened again.

[0062] In a specific implementation, first loosen the positioning screw 140, adjust the position of the positioning member 120 so that the positioning member 120 is close to the bolt to be patched, tighten the positioning screw 140 to fix the position of the positioning member 120, and then perform patching. After the patching is completed, loosen the positioning screw 140 and lift the positioning member 120 to facilitate the removal of the bolt after the patching.

[0063] See also Figures 1 to 3 According to some embodiments of the present application, the guide rod is arranged on one side of the center position 1111, one end of the positioning member 120 is provided with a guide hole 121, and the other end extends in a direction close to the center position 1111 and is provided with a positioning hole 122.

[0064] The guide rod is disposed on one side of the center position 1111 on the fixed disk 111. This design allows the positioning member 120 to move in one direction on the fixed disk 111 while maintaining alignment with the axis of the bolt. Specifically, taking the fixed disk 111 as a disk with the center of the disk as the center position 1111 as an example, the guide member 130 is disposed perpendicularly to the fixed disk 111 so that the guide member 130 is parallel to the axis of the bolt. The position design of the guide rod helps to simplify the structure of the positioning member 120 while ensuring the linearity and accuracy of the positioning member 120 during movement.

[0065] A guide hole 121 is provided at one end of the positioning member 120 for being sleeved on the guide rod to achieve linear movement along the guide rod; a positioning hole 122 is provided at the other end for matching the shape of the ultrasonic patch 220 to ensure accurate centering of the patch. The entire patch device 100 has a simple structure, is easy to operate, and is easy to process and produce, which can reduce production costs.

[0066] See also Figures 1 to 3 According to some embodiments of the present application, the cross-section of the guide rod is a polygonal setting, and the cross-section of the guide hole 121 matches the cross-sectional shape of the guide rod.

[0067] The cross section of the guide rod is designed to be a polygon, and common polygonal cross sections include triangles, squares, rectangles, hexagons, or arcs and straight lines. This design provides multiple contact surfaces, which helps to improve the contact stability and friction between the guide rod and the guide hole 121. By matching the cross section of the guide hole 121 with the cross section of the guide rod, the probability of the position of the positioning member 120 being offset is reduced, thereby ensuring the precise movement of the positioning member 120 along the guide rod.

[0068] See also Figure 1 and Figure 2 According to some embodiments of the present application, a plurality of clamping members 112 may be distributed around the center position 1111 and may be movably arranged in directions approaching and away from the center position 1111 .

[0069] The clamping members 112 are distributed around the center position 1111 on the fixed disk 111, which helps to provide uniform clamping force and ensure that the bolt to be patched remains stable during the patching process. The number of clamping members 112 can be determined according to the diameter of the bolt and the required clamping force, which is not specifically limited here. For example, three clamping members 112 can be provided. Multiple clamping members 112 can be evenly distributed around the center position 1111 to form a symmetrical or asymmetrical layout to accommodate different bolt shapes and sizes. The clamping member 112 can be designed as a clamp, a fixture or other form of fastener, and its shape and size should match the diameter and shape of the bolt to ensure effective clamping.

[0070] The clamping member 112 can be movably arranged in directions approaching and away from the center position 1111, so that multiple clamping members 112 can be adjusted according to the diameter of the bolt to accommodate bolts of different sizes. The movement of the clamping member 112 can be achieved by a manual knob, a lever or an automatic system (such as a servo motor) to ensure that the clamping member 112 can move smoothly and accurately.

[0071] In actual implementation, the bolt to be patched is inserted into the center position 1111 of the fixing plate 111, and then the clamping member 112 is adjusted to move in the direction close to the center position 1111 until the clamping member 112 contacts the bolt and provides appropriate clamping force, wherein the operator or the automatic system can adjust the position of the clamping member 112 according to the diameter and shape of the bolt, ensure that the clamping member 112 is evenly distributed around the bolt, and provide uniform clamping force, and fix the position of the clamping member 112 after the adjustment is completed to ensure that the bolt does not rotate or move during the patch process. After the patch is completed, the multiple clamping members 112 are driven to move in the direction away from the center position 1111, thereby releasing the fixation of the bolt.

[0072] According to some embodiments of the present application, there may be multiple positioning members 120, and the positioning holes 122 of the multiple positioning members 120 have different sizes. The positioning holes 122 of different sizes may be suitable for corresponding to bolts of different types. The positioning members 120 corresponding to the bolts to be patched are selected and set on the fixed plate 111.

[0073] In order to accommodate different types of bolts, the patch device 100 can be provided with a plurality of positioning members 120, and the positioning hole 122 of each positioning member 120 has different sizes to match bolts of different diameters or shapes. For easy identification and selection, each positioning member 120 can have a clear mark, such as a number, letter or color coding, to indicate the bolt model it is applicable to. In some examples, the positioning member 120 can be designed to be easy to replace and store, such as by magnetic adsorption, a quick release mechanism or a drawer-type storage box to facilitate the operator to quickly select and replace the positioning member 120.

[0074] The size of the positioning hole 122 should accurately match the diameter of different types of bolts to ensure that the ultrasonic patch 220 can be accurately attached to the center position 1111 of the bolt end face. The design of the positioning hole 122 can take into account the tolerance range of the bolt to ensure that the positioning hole 122 can maintain stable clamping and centering performance even within the tolerance range of the bolt size.

[0075] In actual implementation, before the patch operation, the operator needs to identify the model of the bolt to be patched and the bolt model. The operator selects a positioning member 120 corresponding to the bolt from multiple positioning members 120 and sets it on the fixed plate 111. This setting enables the patch device 100 provided in the embodiment of the present application to be applicable to bolts of various models, and by setting a positioning hole 122 of different sizes on each positioning member 120, instead of setting multiple positioning holes 122 on one positioning member 120, it is avoided that the position or assembly method of the positioning member 120 is repeatedly adjusted during actual use, resulting in accelerated wear of the positioning member 120, thereby improving the service life and use accuracy of the positioning member 120.

[0076] In addition to centering the ultrasonic patch 220 on the end face of the bolt, the actual working conditions during the road test also affect the accuracy of the test results.

[0077] Generally, after the piezoelectric ceramic sheet is attached to the ultrasonic axial force test of the bolts of the road test vehicle, the axial force tracking test is carried out during the road test and after the road test. However, due to the complex and harsh road test conditions, the end face of the bolt is easily covered with oil, dirt and sand during the driving of the vehicle, and the piezoelectric ceramic sheet is relatively brittle, and the stones splashed during driving are easily broken, resulting in test difficulties or test interruption. In addition, since the anti-corrosion coating on the surface of the bolt head is damaged after being ground flat, surface corrosion is very likely to occur during the road test, which has a great impact on the stability of the ultrasonic information and the accuracy of the results of the subsequent tests.

[0078] Based on the above considerations, the embodiment of the present application also provides a durable road test bolt 200 to reduce the impact of the environment on the test results during the road test and improve the accuracy of the test results.

[0079] See also Figure 4 The embodiment of the present application further provides a durable road test bolt 200 , which includes a bolt body 210 , an ultrasonic patch 220 and a protective member 230 .

[0080] The ultrasonic patch 220 is mounted on the center position 1111 of the head end surface 211 of the bolt body 210 by the patch device 100 of any of the aforementioned embodiments; the protective member 230 is covered on the side of the patch away from the bolt body 210 .

[0081] The ultrasonic patch 220 is mounted on the center position 1111 of the head end surface 211 of the bolt body 210 through the patch device 100, making the ultrasonic signal more stable, reducing the ultrasonic propagation time error, and thus greatly improving the accuracy of subsequent test results.

[0082] The protective member 230 can be made of oil-resistant, mud-resistant and impact-resistant materials, such as rubber, plastic or metal, to ensure that the ultrasonic patch 220 can be effectively protected under harsh road test conditions. The protective member 230 can tightly cover the ultrasonic patch 220 without affecting the transmission and reception of its ultrasonic signal. A semicircular or customized shape design can be used to accommodate different types of bolts. The protective member 230 should be easy to install and fix. For example, the protective member 230 can be connected to the bolt body 210 by snapping, bonding or bolting.

[0083] According to the durable road test bolt 200 of the present application, the ultrasonic patch 220 is mounted on the center position 1111 of the head end face 211 of the bolt body 210 through the patch device 100, so as to ensure the centering degree of the ultrasonic patch 220 and improve the accuracy of the detection data of the ultrasonic patch 220. In addition, by providing a protective member 230, the ultrasonic patch 220 is well protected during the road test to prevent the ultrasonic patch 220 and the bolt end face from colliding and stains from sticking, thereby enhancing the surface corrosion resistance of the parts and improving the success rate and accuracy of the test.

[0084] See also Figure 4 According to some embodiments of the present application, the protective member 230 may include a film 231 and a protective sheet 232. One side of the film 231 is adhesive, and the adhesive side of the film 231 is bonded to the head end surface 211; the protective sheet 232 is arranged between the film 231 and the ultrasonic patch 220, and the projection of the ultrasonic patch 220 in the axial direction of the bolt body 210 is located inside the protective sheet 232.

[0085] One side of the film 231 is sticky and is used to fix the guard 230 on the bolt head end surface 211. The film 231 can be made of a soft and durable material, such as rubber or special plastic, to ensure that adhesion can be maintained under various road test conditions.

[0086] The protective sheet 232 is located between the film 231 and the ultrasonic patch 220, and is used to protect the ultrasonic patch 220 from the influence of the external environment, such as oil, mud, and flying stones. The main function of the protective sheet 232 is to protect the ultrasonic patch 220 and prevent it from being damaged during the road test. The protective sheet 232 can ensure that the projection of the ultrasonic patch 220 in the axial direction of the bolt body 210 is completely within the coverage of the protective sheet 232. The combination of the film 231 and the protective sheet 232 should be able to prevent dirt such as oil, mud, and sand from adhering to the ultrasonic patch 220, and also resist the impact of flying stones on the patch.

[0087] See also Figure 5 The embodiment of the present application also provides a durability test method for a durability road test bolt 200 as in any of the above embodiments, and the durability test method includes: steps S1 to S6.

[0088] S1. Install the bolt body 210 with the patch on the durability test vehicle according to the tightening process and make markings;

[0089] S2, testing the axial force of the bolt body 210 after tightening and saving the axial force data;

[0090] S3, selecting the size of the protective sheet 232 according to the diameter of the head end face 211 of the bolt body 210, and pasting the protective sheet 232 onto the head end face 211 of the bolt;

[0091] S4, dividing the total endurance test mileage into multiple sections, and uncovering the protective member 230 after each section of mileage, performing an axial force test, pasting the protective member 230 back after the measurement, and saving the axial force data in sequence;

[0092] S5. After the endurance test is completed, the axial force data of the endurance road test bolt 200 is loosened and tested to determine the elongation deformation of the bolt body 210;

[0093] S6. Analyze the reliability of the fastening connection of the durability road test bolt 200 based on the axial force data and the elongation deformation.

[0094] It should be noted that after the ultrasonic patch 220 is affixed, it is necessary to use tightening equipment (including tightening device, axial force sensor, torque angle moment sensor) and ultrasonic axial force tester to calibrate the axial force and test the axial force before the bolt is tightened. The equipment and operation requirements for this step can be found in the QC / T 1153 industry standard and will not be elaborated on.

[0095] In step S1, according to the predetermined tightening process, the bolt body 210 with the ultrasonic patch 220 attached is installed on the durability test vehicle. In order to monitor the position change of the bolt during the test, the bolt is marked, which helps to check whether the bolt is loose or shifted later.

[0096] In step S2, after the bolt is installed and tightened, an ultrasonic axial force tester is used to test and record the axial force data of the bolt, and the axial force data obtained from the test is saved as a benchmark data for subsequent analysis. The specific measurement steps can be operated with reference to the QC / T1153 industry standard.

[0097] In step S3, according to the diameter of the head end face 211 of the bolt body 210, a suitable size of the protective sheet 232 is selected to ensure that the protective sheet 232 can completely cover the ultrasonic patch 220, and the protective sheet 232 is pasted to the bolt head end face 211 to ensure that the protective sheet 232 is firmly adhered and protects the ultrasonic patch 220 from the influence of the external environment.

[0098] The total endurance test mileage is divided into multiple small sections, and the axial force test is performed after each section. After each section, the protective sheet 232 is peeled off, the axial force test is performed, and then the protective member 230 is pasted back again, and the axial force data of each test is saved. In this step, if the viscosity of the protective sheet 232 decreases, the protective member 230 can be replaced.

[0099] It should be noted that the number of segments of the total test mileage is not specifically limited, and can be three, four, five or more segments. The proportion of each segment to the total mileage is also not limited, and can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or other proportions between 5% and 50% of the total mileage. Exemplarily, the protective sticker can be removed at about 15%, about 30%, about 50% of the test mileage, and at the end of each stage to conduct an axial force test.

[0100] In step S5, after the endurance test is completed, the bolt is loosened and the axial force data is tested again. The elongation deformation of the bolt body 210 is determined by comparing the axial force data after tightening with the axial force data after the endurance test.

[0101] In step S6, the reliability of the bolt fastening connection is analyzed based on the stored axial force data and the elongation deformation of the bolt, the performance change of the bolt during the durability test is evaluated, and it is determined whether the fastening connection meets the design and use requirements.

[0102] According to the durability test method of the present application, various measurement data of the durability road test bolt 200 during the road test can be effectively obtained, and the test process is reasonable, clear and definite, ensuring the accuracy of the test data and test results.

[0103] In some embodiments, the durability road test may include multiple durability road test vehicles, and multiple durability road test bolts 200 may be installed on the durability road test vehicles. Before step S1, the durability test method further includes:

[0104] Step S0, number the bolts that have been zero-point calibrated and have been affixed with ultrasonic patches 220 according to type and train number.

[0105] The multiple bolts are numbered to distinguish and count the test results of bolts of different types at different positions. The multiple endurance road test bolts 200 can be assembled and calibrated by repeating steps S1 to S3.

[0106] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0107] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0108] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0109] In the description of the present application, “plurality” means two or more.

[0110] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0111] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A patch device, characterized in that: include: A fixing assembly, comprising a fixing plate and a plurality of clamping members movably arranged on the fixing plate, wherein a center position is provided on the fixing plate, and the plurality of clamping members are used to fix the bolts to be patched at the center position; A positioning member is movably arranged on the fixing plate along the axial direction of the bolt fixed at the center position. A positioning hole is provided on the positioning member. The positioning hole is suitable for being aligned with the axial direction of the bolt fixed at the center position. The positioning hole is suitable for matching the shape of the ultrasonic patch.

2. The patch device according to claim 1, characterized in that: The fixing plate is provided with a guide piece, and the positioning piece is movably arranged along the extension direction of the guide piece, and can be limited when it moves close to the bolt fixed at the center position.

3. The patch device according to claim 2, characterized in that: The guide member comprises a guide rod, the positioning member is provided with a guide hole, the guide hole is sleeved outside the guide rod, and the positioning member is provided with a positioning screw which can penetrate into the guide hole.

4. The patch device according to claim 3, characterized in that: The guide rod is arranged on one side of the center position, one end of the positioning member is provided with the guide hole, and the other end extends in a direction close to the center position and is provided with the positioning hole.

5. The patch device according to claim 3, characterized in that: The cross section of the guide rod is polygonal, and the cross section of the guide hole matches the cross section of the guide rod.

6. The patch device according to any one of claims 1 to 5, characterized in that: The plurality of clamping members are distributed on the peripheral side of the center position and are movably arranged in directions approaching and away from the center position.

7. The patch device according to any one of claims 1 to 5, characterized in that: There are multiple positioning members, and the positioning holes of the multiple positioning members have different sizes. The positioning holes of different sizes are suitable for corresponding to bolts of different types. The positioning members corresponding to the bolts to be mounted are selected and arranged on the fixing plate.

8. A durable road test bolt, characterized in that: include: Bolt body; An ultrasonic patch, mounted on the center of the head end face of the bolt body by a patch device as claimed in any one of claims 1 to 7; The protective piece is arranged to cover the side of the patch away from the nut.

9. The durable road test bolt according to claim 8, characterized in that: The protective element comprises: A film, one side of the film is sticky, and the sticky side of the film is bonded to the end surface of the head; The protective sheet is arranged between the film and the ultrasonic patch, and the projection of the ultrasonic patch in the axial direction of the bolt body is located inside the protective sheet.

10. A durability test method for a durable road test bolt according to claim 8 or 9, characterized in that: The durability test method includes: S1. Install the bolt body with the patch on the durability test vehicle according to the tightening process and make markings; S2, testing the axial force of the bolt body after tightening and saving the axial force data; S3, selecting the size of the protective sheet according to the diameter of the end face of the head of the bolt body, and pasting the protective sheet onto the end face of the head of the bolt; S4, dividing the total endurance test mileage into multiple sections, and after each section of mileage, uncovering the protective piece, performing an axial force test, pasting the protective piece back after the measurement, and saving the axial force data in sequence; S5. After the endurance test, loosen and test the axial force data of the endurance road test bolt to determine the elongation deformation of the bolt body; S6. Analyze the reliability of the fastening connection of the durability road test bolts based on the axial force data and the elongation deformation.

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