A tensile and compressive pad belt angle load verification test system and test method

Abstract

This invention provides a test system and method for verifying the angular load on a tension / compression pad, belonging to the technical field of tension / compression pad testing. It includes: a ground rail, an aluminum plate, a column, and an actuator cylinder base, all sequentially fixed to the ground rail. The tension / compression pad to be tested is adhered to the center of the aluminum plate. A fixed pulley is installed above the column. An actuator cylinder for applying a tensile load to the tension / compression pad is fixed on the actuator cylinder base. The aluminum plate, the column, and the actuator cylinder base are aligned in a straight line. The loading end of the actuator cylinder is connected to the tension / compression pad to be tested via a steel cable passing over the fixed pulley. This system applies a tensile load with a certain angle to the tension / compression pad adhered to the aluminum plate, thereby obtaining the maximum tensile load value of the tension / compression pad at that angle. This provides a permissible load reference for the angular load condition of tension / compression pads in areas with large structural deformation. The system can quickly achieve changes in the deflection angle simply by changing the installation distance of the tension / compression pad on the ground rail, resulting in high testing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of tension and compression pad testing technology, specifically relating to a tension and compression pad with angled load verification test system and test method. Background Technology

[0002] Currently, tension-compression pads are widely used as bidirectional load transfer carriers in static structural strength tests of aircraft, and these pads are bonded using adhesives. During the test, when there is an angle between the actual loading direction and the bonding direction, an additional torque is generated at the bonding point between the tension-compression pad and the test. As the load increases, the angle gradually increases, posing certain safety hazards to the test, and may even cause the tension-compression pad to detach prematurely before reaching the target load, leading to a test suspension. Furthermore, the re-bonding period for the tension-compression pad is relatively long, thus affecting the test progress. In addition to the common horizontal and vertical loading, existing tension-compression pads also experience increasing wing deformation at locations such as wingtips as the load increases. This results in a certain angle between the loading direction and the bonding direction of the tension-compression pad, and this angle gradually increases with the load, posing certain safety hazards to the test.

[0003] Therefore, it is necessary to design an experimental system and method to verify the relationship between load transfer and loading angle of the tension / compression pad. Summary of the Invention

[0004] The purpose of this invention is to verify whether the bonding strength of the tension-compression pad and the strength of the single-ear joint of the tension-compression pad meet the test requirements when the tension-compression pad is subjected to angular load.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tension / compression pad angle load verification test system, comprising: a ground rail, an aluminum plate, a column, and an actuator cylinder base, all sequentially fixed on the ground rail. The tension / compression pad to be tested is attached to the center of the aluminum plate. A fixed pulley is installed above the column, and an actuator for applying tensile load to the tension / compression pad is fixed on the base of the actuator. The aluminum plate, the column, and the actuating cylinder base are located in the same straight line, and the loading end of the actuating cylinder is connected to the tension and compression pad to be tested by a steel cable that passes around the fixed pulley.

[0006] The tension and compression pad angle load verification test system provided by the present invention also has the following technical feature: the horizontal distance between the center of the fixed pulley and the center of the tension and compression pad to be tested is the same as the distance between the center of the column and the center of the tension and compression pad.

[0007] The tension and compression pad angle load verification test system provided by the present invention also has the following technical feature: the aluminum plate is fixed on the ground rail by the first pressure beam and anchor bolts.

[0008] The tension / compression pad angle load verification test system provided by the present invention also has the following technical feature: a force sensor for monitoring the load during the test is provided on the steel cable between the tension / compression pad to be tested and the fixed pulley.

[0009] The tension and compression pad angle load verification test system provided by the present invention also has the following technical feature: the fixed pulley is installed on the upper end of the column through a transition section.

[0010] The tension and compression pad angle load verification test system provided by the present invention also has the following technical features: the actuating cylinder is fixed on the actuating cylinder base by the actuating cylinder shaft, and the actuating cylinder base is fixed by the second pressure beam.

[0011] Another object of the present invention is to provide a test method for verifying the angle of a tension / compression pad, the method being implemented based on the test system described in any of the foregoing claims, and comprising the following steps: The tension and compression pad to be tested is pasted onto the aluminum plate, and the pasted aluminum plate and the tension and compression pad to be tested are fixed to the ground rail with the first pressure beam and anchor bolts; Select an actuator and a force sensor and assemble them on the system. Fix the actuator base on the ground rail. The steel cable on the actuator is connected to the tension and compression pad to be tested through the fixed pulley on the column. Move the distance between the test tension and compression pad and the ground rail to change the tension direction. Apply tension to the tension and compression pad through the actuator in different tension directions until the test tension and compression pad is pulled off or destroyed. Record the tension value at the moment of pull-off or destruction. Once the experiment is complete, collect the data and fill out the record.

[0012] Beneficial effects: The tension-compression pad angle load verification test system provided in this application applies a tension-compression pad with a certain angle to a tension-compression pad adhered to an aluminum plate, thereby obtaining the maximum tensile load value of the tension-compression pad at that angle. This provides a load allowable reference for the tension-compression pad angle load in areas with large structural deformation. The system is simple and convenient to install and load. The angle change can be quickly achieved by simply changing the installation distance of the tension-compression pad on the ground rail. The test efficiency is high. Furthermore, this test method can verify the relationship between the load angle and the load-bearing capacity of the tension-compression pad under various conditions such as different tension-compression pad types, sizes, and adhesive types. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the system provided in the embodiment of the present invention. Among them, 1: the tension and compression pad to be tested; 2: aluminum plate; 3: ground rail; 4: first pressure beam; 5: first steel cable-lever connection assembly; 6: single-ear connector; 7: force sensor; 8: first double-ear connector; 9: second steel cable-lever connection assembly; 10: fixed pulley; 11: transition section; 12: column; 13: steel cable; 14: third steel cable-lever connection assembly; 15: second double-ear connector; 16: actuator cylinder; 17: actuator cylinder shaft; 18: second pressure beam; 19: actuator cylinder base. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0016] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention 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. Therefore, they should not be construed as limiting the invention.

[0017] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0018] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0019] like Figure 1As shown, this embodiment of the invention provides a tension / compression pad angle load verification test system, comprising: a ground rail 3, an aluminum plate 2, a column 12, and an actuator cylinder base 19, which are sequentially fixed on the ground rail 3. The test pad 1 is attached to the center of the aluminum plate 2. A fixed pulley 10 is installed above the column 12. An actuator 16 for applying tensile load to the test pad 1 is fixed on the actuator base 19. The aluminum plate 2, the column 12, and the actuator base 19 are located on the same straight line. The loading end of the actuator 16 is connected to the test tension pad 1 via a steel cable 13 that passes over the fixed pulley 10. In the above embodiment, the ground rail 3 fixes the aluminum plate 2, the column 12, and the actuator base 19, so that the test tension pad 1 on the aluminum plate 2, the column 12, and the actuator 16 on the actuator base 19 are kept on a straight line. Moving the installation position of the aluminum plate 2 on the ground rail 3 moves the position of the test tension pad 1, while keeping other positions unchanged, causing the angle of the loading force applied by the actuator 16 through the steel cable to change.

[0020] In some embodiments, the horizontal distance between the center of the fixed pulley and the center of the pressure pad 1 to be tested is the same as the distance X between the center of the column and the center of the pressure pad. For example... Figure 1 As shown, the height of the top of the fixed pulley from the ground is H, and the length of the steel cable between the center of the fixed pulley and the center of the tension pad is L. The distance X, the height H, and the length L form an approximately right-angled triangle, where the height H is a fixed value. The length of the distance X is calculated based on the specific deflection angle ∠a required for the load. The position of the aluminum plate is adjusted, thereby changing the position of the tension pad fixed on the aluminum plate until the calculated distance X is met, thus achieving the application of the tension load at the specific deflection angle ∠a.

[0021] In some embodiments, the aluminum plate 2 is fixed to the ground rail 3 by the first pressure beam 4 and anchor bolts. This fixing method provides sufficient normal preload and shear bearing capacity, effectively ensuring the connection stability of the aluminum plate during loading and preventing the aluminum plate from pulling out; at the same time, it has convenient assembly and disassembly characteristics, which can meet the engineering requirements of rapid installation and disassembly.

[0022] In some embodiments, a force sensor 7 for monitoring the load during the test is provided on the steel cable 13 between the test pad 1 and the fixed pulley 10.

[0023] The force sensor 7 is connected to the test loading connector or actuator through threaded holes at both ends to transmit load, and the load feedback is transmitted to the control system through the plug and sensor cable.

[0024] The cable-lever connection assembly includes a connector for connection, and a bushing fitted onto the steel cable 13 at the other end of the connector. The bushing is connected to the connector by connecting bolts. There are three sets of cable-lever connection assemblies: a first cable-lever connection assembly 5, a second cable-lever connection assembly 9, and a third cable-lever connection assembly 14. Using the cable-lever connection assembly to connect the structure to the steel cable increases the turning radius of the steel cable.

[0025] The force sensor 7 is connected to the steel cable 13 via a single-ear connector 6 and a first double-ear connector 8. The single-ear connector 6 is connected to the steel cable 13 via a first steel cable-lever connection assembly 5, and the first double-ear connector 8 is connected to the steel cable 13 via a second steel cable-lever connection assembly 9. A third steel cable-lever connection assembly 14 is used to connect the actuator 16 to the steel cable 13.

[0026] In some embodiments, the fixed pulley 10 is mounted on the upper end of the column 12 via a transition section 11.

[0027] In some embodiments, the actuator 16 is fixed to the actuator base 19 via the actuator shaft 17, and the actuator base 19 is fixed via the second pressure beam 18.

[0028] In some embodiments, a method for verifying the angle load of a tension / compression pad is provided. This method is implemented based on the test system described in any of the foregoing embodiments and includes the following steps: The tension and compression pad to be tested is pasted onto the aluminum plate, and the pasted aluminum plate and the tension and compression pad to be tested are fixed to the ground rail with the first pressure beam and anchor bolts; Select an actuator and a force sensor and assemble them on the system. Fix the actuator base on the ground rail. The steel cable on the actuator is connected to the tension and compression pad to be tested through the fixed pulley on the column. Move the distance between the test tension and compression pad and the ground rail to change the tension direction. Apply tension to the tension and compression pad through the actuator in different tension directions until the test tension and compression pad is pulled off or destroyed. Record the tension value at the moment of pull-off or destruction. Once the experiment is complete, collect the data and fill out the record.

[0029] Taking a BLYD1-2 tension / compression pad with a verification angle of 0-30° as an example, 24 such pads were selected, each with a size of 120 mm × 120 mm, a maximum tensile load of 2400 N, a safety factor of 4, and were bonded using LDJ-281 adhesive. The allowable load of the actuator cylinder was 30 kN, and the range of the force sensor was 30 kN. The tension / compression pad was subjected to loads at deflection angles of 5°, 10°, 15°, 20°, 25°, and 30°, with four tests performed at each deflection angle. The test procedure is as follows: The tension pad is attached to the aluminum plate, and the attached aluminum plate and tension pad are fixed to the ground rail with the pressure beam and anchor bolts; Select and assemble a 3T actuator and a C030 sensor, ensuring they can withstand tensile loads. The actuator base is fixed to a ground rail. A steel cable connecting the actuator is connected to the tension / compression pad via a fixed pulley on the column, maintaining the required tilt angle for the test. See [link to installation details] for specific installation methods. Figure 1 ; When the tensile load direction is at an angle of 5° to the vertical direction, apply 7200N to the No.1 tension and compression pad in 10 levels, hold for 30 seconds, and then continue to apply tension in 1000N levels until failure. When the tensile load direction is at an angle of 10° to the vertical direction, apply 7200N to the No. 2 tension and compression pad in 10 levels, hold for 30 seconds, and then continue to apply tension in 1000N levels until failure. When the tensile load direction is at an angle of 15° to the vertical direction, apply 7200N to the No. 3 tension and compression pad in 10 levels, hold for 30 seconds, and then continue to apply tension in 1000N levels until failure. When the tensile load direction is at an angle of 20° to the vertical direction, apply 7200N to the No. 4 tension and compression pad in 10 levels, hold for 30 seconds, and then continue to apply tension in 1000N levels until failure. When the tensile load direction is at an angle of 25° to the vertical direction, apply 7200N to the No. 5 tension and compression pad in 10 levels, hold for 30 seconds, and then continue to stretch in 1000N increments until failure. When the tensile load direction is at an angle of 30° to the vertical direction, apply 7200N to the No. 6 tension and compression pad in 10 levels, hold for 30 seconds, and then continue to stretch in 1000N increments until failure. Once the experiment is complete, collect the data and fill out the record.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A test system for verifying the angle load of a tension / compression pad, characterized in that, include: The components consist of a ground rail, an aluminum plate fixed to the ground rail, a column, and an actuator base. The tension / compression pad to be tested is attached to the center of the aluminum plate. A fixed pulley is installed above the column, and an actuator for applying tensile load to the tension / compression pad is fixed on the base of the actuator. The aluminum plate, the column, and the actuating cylinder base are located in the same straight line, and the loading end of the actuating cylinder is connected to the tension and compression pad to be tested by a steel cable that passes around the fixed pulley.

2. The tension / compression pad angle load verification test system according to claim 1, characterized in that, The horizontal distance between the center of the fixed pulley and the center of the pressure pad to be tested is the same as the distance between the center of the column and the center of the pressure pad.

3. The tension / compression pad angle load verification test system according to claim 1, characterized in that, The aluminum plate is fixed to the ground rail by the first pressure beam and anchor bolts.

4. The tension / compression pad angle load verification test system according to claim 1, characterized in that, A force sensor 7 for monitoring the load during the test is installed on the steel cable between the test pad and the fixed pulley.

5. The tension / compression pad angle load verification test system according to claim 1, characterized in that, The fixed pulley is installed on the upper end of the column via a transition section.

6. The tension / compression pad angle load verification test system according to claim 1, characterized in that, The actuator cylinder is fixed to the actuator cylinder base via the actuator cylinder shaft, and the actuator cylinder base is fixed via the second pressure beam.

7. A test method for verifying the angle of a tension / compression pad under load, characterized in that, The method is implemented based on the test system as described in any one of claims 1-6, and includes the following steps: The tension and compression pad to be tested is pasted onto the aluminum plate, and the pasted aluminum plate and the tension and compression pad to be tested are fixed to the ground rail with the first pressure beam and anchor bolts; Select an actuator and a force sensor and assemble them on the system. Fix the actuator base on the ground rail. The steel cable on the actuator is connected to the tension and compression pad to be tested through the fixed pulley on the column. Move the distance between the test tension and compression pad and the ground rail to change the tension direction. Apply tension to the tension and compression pad through the actuator in different tension directions until the test tension and compression pad is pulled off or destroyed. Record the tension value at the moment of pull-off or destruction. Once the experiment is complete, collect the data and fill out the record.

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