A mesh bursting test device and test method thereof

Abstract

The present invention discloses a mesh bursting test device and a test method thereof, comprising a fixture, an actuator, a push block, a pressure sensor, a displacement sensor, a drive system, and a control system; the fixture is used to install the mesh; the actuator is installed on the crossbeam of the fixture, and a push block is provided on the upper part or top of the actuator, and the push block and the actuator are both located below the mesh; a displacement sensor is provided on the crossbeam of the fixture and near the actuator; a pressure sensor is provided on the upper part or top of the actuator; the control system is electrically connected to the displacement sensor, the pressure sensor, and the drive system respectively; and the drive system is connected to the actuator. The present invention uses the pressure sensor and the displacement sensor to measure the bursting force and deformation in real time throughout the test process, thereby obtaining a relationship curve between the bursting force and the deformation, with high measurement accuracy, and provides accurate guidance for force analysis of mesh applications.

Description

Technical Field

[0001] The invention belongs to the technical field of mesh surface testing devices, and in particular relates to a mesh surface bursting testing device and a testing method thereof. Background Art

[0002] Gabion mesh is an engineering technology that uses corrosion-resistant and wear-resistant galvanized low-carbon steel wire or 5% or 10% aluminum-zinc alloy steel wire (or similar plastic-coated steel wire) woven into double- or multi-twisted hexagonal metal mesh. This mesh is assembled into honeycomb boxes according to project design requirements and filled with fillers such as rocks. This honeycomb structure conforms to the principles of mechanics, forming a large, homogeneous block structure capable of withstanding tension and absorbing unexpected pressure. Gabion mesh technology effectively integrates engineering structures with the ecological environment, making it a suitable structural form for protecting riverbeds, controlling landslides, preventing debris flows, and preventing rockfalls, while also ensuring ecological protection.

[0003] Typically, gabion mesh performance testing is limited to testing its tensile strength. In actual engineering applications, the longitudinal tensile force on the mesh structure is very limited, and the mesh's bursting force is more consistent with the actual application of gabion mesh in engineering. Therefore, it is necessary to develop a device or apparatus that can test the mesh's bursting force in order to better study the mesh's bursting performance.

[0004] At present, there is no special bursting test device in China to test the bursting performance of gabion mesh; secondly, it can be seen from the specification "Machine-woven wire mesh and assemblies for engineering use" (YB / T-4190) that only machine-woven double-twisted hexagonal wire mesh has different mesh sizes and mesh diameters. Different mesh sizes will lead to different numbers of meshes under the same test area. Therefore, there is no bursting test device that can adapt to the bursting performance test of gabion mesh with different aperture sizes and different weaving forms.

[0005] For example, the Chinese patent document with authorization announcement number CN109443936B, entitled "Mesh bursting and stretching integrated self-balancing experimental device and test method", discloses a mesh bursting and stretching integrated self-balancing experimental device that can perform both tensile tests and bursting tests. When performing the bursting test, the hydraulic device drives the wire rope to pull up, thereby driving the pushing device to pull up. The pushing device disperses the tension on the mesh, and eventually breaks the mesh. This device and test method can only perform bursting tests, and cannot measure the bursting force and deformation during the test in real time. Even if the deformation can be measured, the measured deformation includes not only the deformation of the mesh but also the deformation of the wire rope, resulting in low measurement accuracy of the mesh deformation. At the same time, the mesh is hung on the shackles, and the number of shackles and the spacing between the shackles cannot be adjusted. Therefore, it cannot adapt to the bursting test of meshes with different mesh sizes and mesh numbers. In addition, the cross-section of the shackles is usually circular, which cannot fit better with the mesh, especially cannot fit better with the twisted position on the side of the mesh. Therefore, it will cause uneven force on the entire mesh, affecting the test accuracy.

[0006] For example, the Chinese patent application publication number is CN112903415A, entitled "A method for calculating the full curve of the bursting force-tensile displacement of a flexible annular protective net", in which the attached Figure 7 When the test device shown is performing a bursting test, the deformation includes the deformation of the mesh and the deformation of the pull rod, resulting in low mesh deformation measurement accuracy; at the same time, it cannot adapt to the bursting test of meshes with different mesh sizes and mesh numbers. Summary of the Invention

[0007] The purpose of the present invention is to provide a mesh bursting test device and a test method thereof to solve the problems of low mesh deformation measurement accuracy, inability to adapt to mesh bursting tests of different mesh sizes and mesh numbers, and uneven force caused by the mesh hanging point position, which affects the test accuracy. The hanging point position refers to the connection point position between the mesh and the clamp, such as the connection point position between the mesh and the shackle.

[0008] The present invention solves the above technical problems through the following technical solutions: a mesh bursting test device comprising:

[0009] clamps for mounting the mesh;

[0010] an actuator provided on the fixture beam;

[0011] A push block is provided on the upper part of the actuator, and the push block is located below the mesh;

[0012] a displacement sensor disposed on the fixture beam and close to the actuator;

[0013] a pressure sensor disposed on the upper portion of the actuator;

[0014] a drive system connected to the actuator;

[0015] A control system electrically connected to the displacement sensor, the pressure sensor and the drive system.

[0016] During the bursting test, the control system sends control instructions to the drive system. Under the action of the control instructions, the drive system works and accurately drives the actuator to move upward or downward, thereby generating bursting force and stroke changes on the mesh. During the movement of the actuator, the pressure sensor collects the bursting force applied by the push block to the mesh, and the displacement sensor collects the deformation of the mesh (or the stroke of the actuator). The bursting force and deformation are fed back to the control system in real time and displayed on the control system interface.

[0017] The mesh bursting test device described in the present invention can measure the bursting force and deformation in real time during the entire test process through pressure sensors and displacement sensors, thereby obtaining a relationship curve between the bursting force and the deformation. The measurement accuracy is high, and it has accurate guiding significance for the force analysis of mesh application, providing accurate data support for better mesh design and later engineering project applications; the actuator directly applies the bursting force to the mesh through the pushing block, and the pushing block adopts a rigid ascending bursting motion mode (no deformation), and the measured deformation is only the deformation of the mesh, which further improves the measurement accuracy; the control system and the drive system control the movement of the actuator to ensure that the entire device is high-precision, high-efficiency, low-noise and fast-response; the control system + drive system + actuator can adapt to meshes of different strengths and specifications such as ordinary and high-strength meshes, and can cover the testing of all specifications of meshes currently used in the market while ensuring control accuracy.

[0018] Furthermore, the actuator is a hydraulic cylinder, and the drive system is a hydraulic servo system.

[0019] Furthermore, the pushing block is a pot-cover-shaped disc, the pot-cover-shaped spherical radius is 400 mm, the maximum projection diameter of the disc is 350 mm, and the edge fillet radius of the disc is 50 mm.

[0020] Furthermore, the fixture includes a mounting base with a square frame, a crossbeam arranged on the mounting base, a fixture plate, a pressure plate and a mesh fixing block; a slide groove is provided on each side of the square frame; a fixture plate is correspondingly provided on the slide groove of each side, and the fixture plate can move on the slide groove to adjust the distance between the two relative fixture plates and the fixture plate is fixed to the corresponding side of the square frame after the distance is determined; a milling groove is provided on the fixture plate that is inwardly recessed and passes through the fixture plate along the length direction; one end of multiple mesh fixing blocks is embedded in the milling groove and adapted to the shape of the milling groove; each fixture plate is equipped with a pressure plate, and a long through hole is provided on the pressure plate; when the mesh is hung on multiple mesh fixing blocks on the fixture plate, the other end of multiple mesh fixing blocks passes through the long through hole of the pressure plate and fixes the pressure plate to the fixture plate.

[0021] The distance between the two fixture plates is adjusted according to the length and width of the mesh to meet the test requirements of meshes of different sizes; since the milling groove runs through the length direction of the fixture plate, the mesh fixing block in the milling groove can be moved out of the fixture plate, so that the number of mesh fixing blocks is adapted to the number of mesh holes on one side of the mesh, and at the same time the mesh fixing block can be moved in the milling groove, so it can adapt to different mesh sizes, solving the problem of mesh bursting test that cannot adapt to different mesh sizes and mesh numbers; when the mesh is installed on the fixture, the long through hole on the pressure plate can prevent the mesh fixing block from moving out of the fixture, effectively preventing the test mesh from detaching from the mesh fixing block, avoiding stress concentration that causes the mesh to break here and lead to test failure.

[0022] Furthermore, the net hanging fixing block corresponding to the top of the mesh is cylindrical, and the net hanging fixing block corresponding to the twisted position of the mesh is square.

[0023] A cylindrical mesh fixing block is used at the top of the mesh, and a square mesh fixing block is used at the twisting position to adapt to the shape of the mesh. This allows the mesh fixing block to fit better with the mesh hanging point position, eliminating interference with the mesh during the test and making the entire mesh more evenly stressed. This allows for more even control of the deformation of the test mesh, better simulation of the mesh stress state, and improved burst test accuracy.

[0024] Furthermore, the pressure plate is made of a lightweight, high-strength aluminum alloy material, which is easy to load and unload. While ensuring the test strength, it is easier to operate, thereby improving work efficiency and test safety.

[0025] The present invention also provides a test method for the mesh bursting test device as described above, comprising the following steps:

[0026] Remove the pressing plate and match the corresponding number of mesh fixing blocks on the corresponding fixture plate according to the number of mesh holes on each side of the test mesh;

[0027] Adjusting the distance between the two relative fixture plates and fixing the fixture plates to the square frame of the mounting base when the distance matches the size of the test mesh;

[0028] Adjust the distance between two adjacent mesh fixing blocks on the same fixture plate to adapt to different mesh sizes. Each mesh corresponds to a mesh fixing block. Hang the test mesh on the mesh fixing block so that the mesh fixing block is located at the top or twisted position of the test mesh.

[0029] Place the pressing plate on the corresponding fixture plate, pass the net-hanging fixing block through the long through hole of the pressing plate, and fix the pressing plate on the fixture plate;

[0030] Set the test parameters, put the push block in the initial state, and start the test;

[0031] The control system sends a control instruction to the drive system, and under the action of the control instruction, the drive system drives the actuator to move upward;

[0032] During the movement of the actuator, the pressure sensor and the displacement sensor synchronously collect the bursting force and deformation, and feed the bursting force and deformation back to the control system;

[0033] When the test mesh breaks, the test stops automatically and the control system displays the relationship curve between the bursting force and the deformation.

[0034] Furthermore, during the distance adjustment, the pushing block is located in the middle of the square frame formed by the four fixture plates to ensure that the test mesh is evenly stressed.

[0035] Furthermore, when the test mesh is hung on the mesh fixing block, the deflection value of the center of the test mesh is not greater than 20% of the minimum side length of the test mesh, so that the test mesh is close to the reference plane. The reference plane refers to the plane formed by all hanging point positions, and the deflection value refers to the distance from the center of the test mesh to the reference plane when the test mesh is naturally suspended.

[0036] The deflection value at the center of the test mesh is no more than 20% of the minimum side length of the test mesh, so that the mesh is in a slightly tensioned state, avoiding excessive sagging of the mesh affecting the test results, and at the same time avoiding the situation where the pressure sensor and displacement sensor have reached full scale but the mesh has not yet broken, reducing the requirements for the range of the pressure sensor and displacement sensor.

[0037] Furthermore, when the breaking type judgment is selected and the breaking force collected by the pressure sensor is greater than the first set value, the judgment of whether the test mesh is broken is started;

[0038] When the decrease in the bursting force collected by the pressure sensor is greater than a second set value, the test mesh is judged to be broken, and the process automatically stops; wherein the decrease in the bursting force is equal to the difference between the current bursting force and the peak bursting force.

[0039] Preferably, the first set value is 2% to 5% of the measuring range of the pressure sensor; and the second set value is 50% to 75% of the maximum bursting force collected by the pressure sensor.

[0040] The decrease in the bursting force is greater than the second set value, thereby avoiding the misjudgment of mesh breakage caused by local fluctuations in the bursting force due to other factors.

[0041] Beneficial effects

[0042] Compared with the prior art, the advantages of the present invention are:

[0043] The present invention provides a mesh bursting test device and test method. The device uses a pressure sensor and a displacement sensor to measure the bursting force and deformation in real time throughout the test process, thereby obtaining a relationship curve between the bursting force and the deformation. The device has high measurement accuracy and provides accurate guidance for mesh application force analysis, providing accurate data support for better mesh design and subsequent engineering project applications.

[0044] The actuator directly applies the bursting force to the mesh through the push block. The push block adopts a rigid upward bursting motion mode (no deformation). The measured deformation is only the deformation of the mesh, which further improves the measurement accuracy.

[0045] The control system and drive system control the movement of the actuator to ensure that the entire device is high-precision, efficient, low-noise and fast-response. The control system + drive system + actuator can adapt to meshes of different strengths and specifications, such as ordinary and high-strength meshes. Under the premise of ensuring control accuracy, it can cover the testing of all mesh specifications currently used in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 2. It is a schematic structural diagram of a mesh bursting test device according to an embodiment of the present invention;

[0048] Figure 2 1 is a schematic structural diagram of a clamp according to an embodiment of the present invention;

[0049] Figure 3is a top view of a clamp with a mesh installed in an embodiment of the present invention;

[0050] Figure 4 Schematic diagram of the structure of the fixture plate and its milling groove in an embodiment of the present invention;

[0051] Figure 5 2 is a schematic structural diagram of a pressing plate and its long through hole in an embodiment of the present invention;

[0052] Figure 6 1. The three views (front view, side view, and top view) of the circular screen fixing block in the embodiment of the present invention;

[0053] Figure 7 1. The three views (front view, side view, and top view) of the square mesh fixing block in the embodiment of the present invention;

[0054] Figure 8 Schematic diagram of the mesh fixing block at the top and twisting position of the mesh according to an embodiment of the present invention;

[0055] Figure 9 This is a dimensional diagram of the push block in an embodiment of the present invention;

[0056] Figure 10 This is a schematic diagram of the control system software interface in an embodiment of the present invention;

[0057] Figure 11 This is the mesh fracture judgment parameter setting interface in the embodiment of the present invention;

[0058] Figure 12 2 is a graph showing the relationship between bursting force and deformation in an embodiment of the present invention.

[0059] Among them, 1- fixture, 11- crossbeam, 12- square frame, 121- slide, 13- fixture plate, 131- milling groove, 14- pressure plate, 141- long through hole, 15- hanging net fixing block, 151- round hanging net fixing block, 152- square hanging net fixing block, 2- actuator, 3- displacement sensor, 4- pressure sensor, 5- push block, 6- mesh. DETAILED DESCRIPTION

[0060] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0061] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0062] like Figure 1 As shown, a mesh bursting test device provided by an embodiment of the present invention includes a fixture 1, an actuator 2, a push block 5, a pressure sensor 4 and a displacement sensor 3, a drive system and a control system; the fixture 1 is used to install the mesh 6; the actuator 2 is installed on the crossbeam 11 of the fixture 1, and a push block 5 is provided on the upper part or top of the actuator 2, and the push block 5 and the actuator 2 are both located below the mesh 6; a displacement sensor 3 is provided on the crossbeam 11 of the fixture 1 and close to the actuator 2; a pressure sensor 4 is provided on the upper part or top of the actuator 2; the control system is electrically connected to the displacement sensor 3, the pressure sensor 4 and the drive system respectively; and the drive system is connected to the actuator 2.

[0063] In a specific embodiment of the present invention, the actuator 2 is a hydraulic cylinder, and the drive system is a hydraulic servo system; the actuator 2 can also be a screw assembly, and the drive system is a drive motor.

[0064] The control system and drive system control the movement of actuator 2, ensuring high precision, efficiency, low noise, and rapid response for the entire device. The control system, drive system, and actuator 2 combine to accommodate meshes of varying strengths and specifications, from standard to high-strength meshes, encompassing all mesh specifications currently in use while ensuring control accuracy. Simultaneously, actuator 2 directly applies a bursting force to the mesh through pusher block 5, which uses a rigid upward bursting motion (no deformation). The measured deformation is solely that of the mesh, improving deformation measurement accuracy.

[0065] The pressure sensor 4 and the displacement sensor 3 are selected according to the test accuracy requirements and the test range. The range of the pressure sensor 4 is greater than the maximum thrust of the mesh; the range of the displacement sensor 3 is greater than the maximum deformation before the mesh breaks.

[0066] like Figures 2 to 5 As shown, in a specific embodiment of the present invention, the fixture 1 includes a mounting base with a square frame 12, a crossbeam 11 provided on the mounting base, a fixture plate 13, a pressing plate 14 and a net fixing block 15; a slide groove 121 (such as Figure 3 As shown); A fixture plate 13 is provided on each side of the slide groove 121, and the fixture plate 13 can move on the slide groove 121 to adjust the distance between the two relative fixture plates 13 and after the distance is determined, the fixture plate 13 is fixed to the corresponding side of the square frame 12; a milling groove 131 (as shown) is provided on the fixture plate 13 and is concave inwardly and passes through the fixture plate 13 along the length direction. Figure 4One end of a plurality of hanging mesh fixing blocks 15 is embedded in the milling groove 131 and is adapted to the shape of the milling groove 131; each fixture plate 13 is configured with a pressing plate 14, which has a long through hole 141 (as shown in FIG. Figure 5 When the mesh 6 is hung on the plurality of mesh fixing blocks 15 on the fixture plate 13, the other end of the plurality of mesh fixing blocks 15 passes through the long through hole 141 of the pressure plate 14 (as shown); Figure 2 As shown), the pressing plate 14 is fixed on the fixture plate 13.

[0067] Each side of the square frame 12 corresponds to a fixture plate 13, that is, there are four fixture plates 13, and each side of the square frame 12 is provided with two slide grooves 121, such as Figure 3 As shown, the fixture plates 13 can move within the chute 121, thereby adjusting the distance between the two relative fixture plates 13 to accommodate the length and width (or side length) of different test meshes. As long as each side of the square frame 12 is wide enough and the chute 121 on each side is long enough, the adjustment range of the distance between the two relative fixture plates 13 is large enough, and burst tests can be performed on test meshes of different sizes. Generally, the standard length and width values for the test dimensions of test meshes of different mesh specifications are 1.0m, and the allowable error of the standard length and width values is ±20%. That is, the fixture 1 can clamp test meshes 6 with a test size of 0.8 to 1.2m for burst tests.

[0068] The position of the fixture plate 13 in the chute 121 is determined based on the mesh type and the test size of the mesh 6. For example, if the mesh has a transverse dimension of 62.4 mm, then the length of 16 meshes is 0.998 m, and 15.5 meshes and 16.5 meshes are the test values closest to 1.0 m. In other words, the two fixture plates 13 in the transverse direction of the mesh need to be adjusted on the chute 121 so that the distance between the milling groove 131 position of the fixture plate 13 (the position of the mesh hanging fixing block 15) and the test center point is adjusted to a position of = 998 mm / 2 = 499 mm.

[0069] Different meshes have different mesh sizes and different mesh numbers. In order to adapt to the clamping and testing of different mesh sizes and mesh numbers, a milling groove 131 is provided on the fixture plate 13 which runs through the fixture plate 13 along the length direction. Each mesh fixing block 15 corresponds to a mesh. The mesh fixing block 15 can be moved out and into the fixture plate 13 through the milling groove 131 to adapt to the different mesh numbers of the mesh; at the same time, the position of the mesh fixing block 15 on the fixture plate 13 and the milling groove 131 can be adjusted arbitrarily, so as to adjust the distance between two adjacent mesh fixing blocks 15 to adapt to different mesh sizes, which solves the problem that the fixture 1 is not compatible with different mesh sizes and different mesh numbers, and can be infinitely adjusted to adapt to a variety of mesh specifications.

[0070] Each fixture plate 13 corresponds to a pressure plate 14, which is provided with an elongated through-hole 141 to allow the other end of the mesh fixing block 15 to pass through the elongated through-hole 141. When the mesh is hung on the mesh fixing block 15, the mesh fixing block 15 passes through the corresponding pressure plate 14 and is fixed to the fixture plate 13 by fixing bolts, preventing the mesh from falling off the mesh fixing block 15 and affecting the test. The elongated through-hole 141 on the pressure plate 14 prevents the mesh fixing block 15 from moving off the fixture plate 13, effectively preventing the test mesh from falling off the mesh fixing block 15 and avoiding stress concentration that could cause the mesh to break at this point and lead to test failure.

[0071] like Figures 6-8 As shown, in one embodiment of the present invention, the mesh fixing block corresponding to the top of the mesh is cylindrical 151, and the mesh fixing block corresponding to the mesh twisting position is square 152. The use of cylindrical mesh fixing block 151 at the top of the mesh and square mesh fixing block 152 at the twisting position adapts to the shape of the mesh, allowing the mesh fixing block 15 to better fit the mesh hanging point position, eliminating interference with the mesh during the test, making the entire mesh more evenly stressed, thereby more evenly controlling the deformation of the test mesh, better simulating the stress state of the mesh, and improving the accuracy of the burst test.

[0072] like Figure 9 As shown, in one embodiment of the present invention, the push block 5 is a pot-lid-shaped disc with a spherical radius of 400 mm, a maximum projected diameter of 350 mm, and a 50 mm edge radius. This size of push block 5 can be used to test gabion meshes of varying mesh sizes. The standard length and width values for these test meshes are 1.0 m, with an allowable error of ±20%.

[0073] like Figure 2 As shown, the mounting base with a square frame 12 adopts a column structure, and the actuator 2 is placed at the bottom, which is convenient for loading and unloading samples and has good stability.

[0074] An embodiment of the present invention further provides a test method for the mesh bursting test device as described above, comprising the following steps:

[0075] 1. Remove the pressing plate 14 and match the corresponding number of mesh hanging fixing blocks 15 on the corresponding fixture plate 13 according to the number of mesh holes on each side of the test mesh.

[0076] For example, the lateral dimension of the mesh is 62.4 mm, then the length of 16 meshes is 0.998 m, 15.5 meshes and 16.5 meshes are the test values closest to 1.0 m, and 16 mesh fixing blocks 15 need to be moved into the milling groove 131 of the fixture plate 13 so that each mesh corresponds to a mesh fixing block 15.

[0077] 2. Adjust the distance between the two relative fixture plates 13 and fix the fixture plates 13 to the square frame 12 of the mounting base when the distance matches the size of the test mesh.

[0078] For example, the length of 16 meshes is 0.998 m. The distance between the two corresponding clamp plates 13 is adjusted according to the length so that the distance is equal to 0.998 mm. After the adjustment, the clamp plates 13 are fixed to the square frame 12.

[0079] When adjusting the position of the fixture plate 13, attention should be paid to the position of the push block 5, and the push block 5 should be located as much as possible in the middle of the square frame formed by the four fixture plates 13. Then, during the test, the push block 5 should be located in the center of the test mesh, thereby ensuring that the test mesh is subjected to uniform force as much as possible and improving the test accuracy.

[0080] 3. Adjust the distance between two adjacent net-hanging fixing blocks 15 on the same fixture plate 13 to adapt to different mesh sizes. Each mesh corresponds to a net-hanging fixing block 15. Hang the test mesh 6 on the net-hanging fixing block 15 so that the net-hanging fixing block 15 is located at the top or twisted position of the test mesh 6.

[0081] Since the fixture plate 13 has been adjusted according to the test size of the mesh, when the mesh is hung on the mesh fixing block 15, the position of the mesh fixing block 15 is fixed due to the tension of the mesh, that is, the mesh fixing block 15 will not move in the milling groove 131 without a large external force.

[0082] When the test mesh is hung on the mesh fixing block 15, a height or distance measuring tool (e.g., a ruler) can be used to measure the deflection value of the mesh center. The deflection value of the test mesh center is no more than 20% of the minimum side length of the test mesh. This allows the test mesh to be close to the reference plane. The reference plane refers to the plane formed by all the hanging points. The deflection value refers to the distance from the test mesh center to the reference plane when the test mesh is naturally suspended. The mesh is in a slightly tensioned state, which prevents the mesh from sagging excessively and affecting the test results. At the same time, it prevents the pressure sensor 4 and displacement sensor 3 from reaching full range while the mesh has not yet broken, thereby reducing the requirements for the range of the pressure sensor 4 and displacement sensor 3.

[0083] When the deflection value of the test mesh center is greater than 20% of the minimum side length of the test mesh, the fixture plate 13 can be fine-tuned to meet the requirement that the deflection value is no greater than 20% of the minimum side length of the test mesh.

[0084] 4. Place the pressing plate 14 on the corresponding fixture plate 13 , pass the net-hanging fixing block 15 through the long through hole 141 of the pressing plate 14 , and fix the pressing plate 14 on the fixture plate 13 .

[0085] The order of steps 1 to 4 can be adjusted arbitrarily, as long as the push block 5 is in the center of the test mesh or the square formed by the four fixture plates 13 (to ensure uniform force as much as possible), and the installed test mesh is in a slightly tensioned state.

[0086] 5. Set the test parameters, put the push block 5 in the initial state, and start the test.

[0087] After the mesh is installed, connect the lines or interfaces between the components, install the test software on the control system, enter the test software interface, clear the data such as bursting force (or stress) and deformation on the test software interface, and set the test parameters on the test software interface, such as Figure 10 As shown, for example, the movement speed of the actuator 2, the test range setting, the starting point setting of the test mesh fracture judgment, the fracture condition setting, that is, the setting of the first set value and the second set value (such as Figure 11 shown) and so on.

[0088] In this embodiment, the test software is an existing software, such as MaxTest software. Figure 10 As shown, the software interface consists of the menu bar, status bar, toolbar, display panel, and control panel. The menu bar primarily includes the data bar, settings bar, adjustment bar, toolbar, window bar, and help bar. The data bar allows users to create new specimen information, open historical data, save current data, save current data as a text file, print reports, and analyze test data. The settings bar allows users to select force sensors and extensometers and configure system and analysis settings. The adjustment bar allows users to debug parameters and perform calibration. The toolbar allows users to record calibration, observe control, replay curves, determine elasticity compensation coefficients (determine system and sensor stiffness and apply them to deformation measurements), add test types, customize user projects, save debugging parameter files, and manage add-ins. The window bar primarily arranges windows and sets curve positions. The status bar displays information about the specimen and controls during the test. The toolbar provides quick operations such as clearing zeros, adding or deleting curve markers, selecting test types, and displaying the data panel. The display panel displays information about force and deformation, displacement, and curves. The control panel includes control mode selection cards, the test control center, servo output, proportional output, and displacement control position adjustment.

[0089] MaxTest software is an open system that supports extended test methods and user-defined projects. It can print and view test curves according to burst test requirements. The supported curve types are any of force-deformation, stress-strain, force-time, force-displacement and deformation-time. Multiple test data and curves can be summarized, compared, displayed and printed, and users can customize the print report format.

[0090] The testing software automatically detects changes in specimen force during the test, displays curves such as force vs. displacement and force vs. deformation, and automatically generates and prints test reports. With lab networking capabilities, test data can be directly uploaded to a management system. The software monitors the relationship between deformation and force throughout the entire test process, providing accurate data support for better product design and subsequent applications.

[0091] The initial state of the pushing block 5 is that the vertex of the pushing block 5 is located in the reference plane. The pushing block 5 can be placed in the initial state by pressing the reset button.

[0092] Alternatively, the test parameters may be set first, with the push block 5 in the initial state, and then the mesh may be mounted on the fixture 1 according to steps 1 to 4, and then the test may be started.

[0093] 6. The control system sends a control instruction to the drive system according to the set parameters. Under the action of the control instruction, the drive system drives the actuator 2 to move upward.

[0094] 7. During the movement of the actuator 2, the pressure sensor 4 and the displacement sensor 3 synchronously collect the bursting force and deformation, and feed the bursting force and deformation back to the control system.

[0095] The bursting force or stress of the mesh is measured by the pressure sensor 4, and the deformation is measured by the displacement sensor 3. Unlike the displacement, the deformation is measured when the force value collected by the pressure sensor 4 reaches a positive value, while the displacement is measured when the actuator 2 starts to move. That is, the displacement is a value relative to the reference plane, while the deformation is measured when the pressure sensor 4 outputs a force value. The deformation is smaller than the displacement.

[0096] 8. When the test mesh breaks, the test stops automatically and the control system displays the relationship curve between the bursting force and the deformation.

[0097] When the breakage type judgment is selected and the bursting force collected by the pressure sensor 4 is greater than the first set value, the test mesh is judged to be broken and the test automatically stops when the decrease in the bursting force collected by the pressure sensor 4 is greater than the second set value. The decrease in the bursting force is equal to the difference between the current bursting force and the peak bursting force. In this embodiment, the first set value is 2% to 5% of the range of the pressure sensor 4; the second set value is 50% to 75% of the maximum bursting force collected by the pressure sensor 4, which is determined according to the range and the sample. The decrease in the bursting force greater than the second set value avoids the misjudgment of mesh breakage caused by local fluctuations in the bursting force due to other factors. The effectiveness and accuracy of the mesh breakage judgment are guaranteed by the start setting and judgment condition setting of the mesh breakage judgment.

[0098] After the test is stopped, the test data is recorded and saved, the pressing plate 14 is released, the mesh sample is removed, and the push block 5 is reset. Figure 12 The force-deformation curve shown in the figure. The control system + drive system + actuator 2 can ensure that the test can continue after the intermediate shutdown, ensuring the accuracy of the data; after the test is completed, the machine automatically stops and has an automatic reset function.

[0099] The above disclosure is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, and they should all be covered by the scope of protection of the present invention.

Claims

1. A mesh bursting test device, characterized in that: include: clamps for mounting the mesh; an actuator provided on the fixture beam; A push block is provided on the upper part of the actuator, and the push block is located below the mesh; a displacement sensor disposed on the fixture beam and close to the actuator; a pressure sensor disposed on the upper portion of the actuator; a drive system connected to the actuator; a control system electrically connected to the displacement sensor, the pressure sensor, and the drive system; the control system being configured to, when a breakage type determination is selected and the bursting force measured by the pressure sensor is greater than a first set value, begin determining whether the test mesh is broken; and automatically stop the test when a decrease in the bursting force measured by the pressure sensor is greater than a second set value; wherein the decrease in the bursting force is equal to the difference between the current bursting force and the peak bursting force; wherein, the fixture includes a mounting seat with a square frame, a crossbeam arranged on the mounting seat, a fixture plate, a pressure plate and a net hanging fixing block; a slide groove is provided on each side of the square frame; a fixture plate is correspondingly provided on the slide groove of each side, and the fixture plate can move on the slide groove to adjust the distance between the two relative fixture plates and the fixture plate is fixed to the corresponding side of the square frame after the distance is determined; a milling groove is provided on the fixture plate that is inwardly recessed and passes through the fixture plate along the length direction; one end of multiple net hanging fixing blocks is embedded in the milling groove and adapted to the shape of the milling groove; each fixture plate is configured with a pressure plate, and a long through hole is provided on the pressure plate; when the mesh is hung on multiple net hanging fixing blocks on the fixture plate, the other end of multiple net hanging fixing blocks passes through the long through hole of the pressure plate and fixes the pressure plate to the fixture plate.

2. The mesh bursting test device according to claim 1, characterized in that: The actuator is a hydraulic cylinder, and the drive system is a hydraulic servo system.

3. The mesh bursting test device according to claim 1, characterized in that: The pushing block is a pot-cover-shaped disc, the pot-cover-shaped spherical radius is 400 mm, the maximum projection diameter of the disc is 350 mm, and the edge fillet radius of the disc is 50 mm.

4. The mesh bursting test device according to claim 1, characterized in that: The mesh hanging fixing block corresponding to the top of the mesh is cylindrical, and the mesh hanging fixing block corresponding to the twisted position of the mesh is square.

5. The mesh bursting test device according to claim 1, characterized in that: The pressing plate is made of a lightweight, high-strength aluminum alloy.

6. A test method for the mesh bursting test device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Remove the pressing plate and match the corresponding number of mesh fixing blocks on the corresponding fixture plate according to the number of mesh holes on each side of the test mesh; Adjusting the distance between the two relative fixture plates and fixing the fixture plates to the square frame of the mounting base when the distance matches the size of the test mesh; Adjust the distance between two adjacent mesh fixing blocks on the same fixture plate to adapt to different mesh sizes. Each mesh corresponds to a mesh fixing block. Hang the test mesh on the mesh fixing block so that the mesh fixing block is located at the top or twisted position of the test mesh. Place the pressing plate on the corresponding fixture plate, pass the net-hanging fixing block through the long through hole of the pressing plate, and fix the pressing plate on the fixture plate; Set the test parameters, put the push block in the initial state, and start the test; The control system sends a control instruction to the drive system, and under the action of the control instruction, the drive system drives the actuator to move upward; During the movement of the actuator, the pressure sensor and the displacement sensor synchronously collect the bursting force and deformation, and feed the bursting force and deformation back to the control system; When the test mesh breaks, the test stops automatically and the control system displays the relationship curve between the bursting force and the deformation.

7. The test method according to claim 6, wherein During the distance adjustment, the pushing block is located in the middle of the square frame formed by the four clamping plates.

8. The test method according to claim 6, wherein When the test mesh is hung on the mesh fixing block, the deflection value of the center of the test mesh is not greater than 20% of the minimum side length of the test mesh, so that the test mesh is close to the reference plane. The reference plane refers to the plane formed by all hanging point positions, and the deflection value refers to the distance from the center of the test mesh to the reference plane when the test mesh is naturally suspended.

9. The test method according to any one of claims 6 to 8, wherein When the breaking type judgment is selected and the breaking force collected by the pressure sensor is greater than the first set value, the judgment of whether the test mesh is broken is started; When the decrease in the bursting force collected by the pressure sensor is greater than a second set value, the test mesh is judged to be broken, and the process automatically stops; The decrease in bursting force is equal to the difference between the current bursting force and the peak bursting force.

10. The test method according to claim 9, wherein The first set value is 2% to 5% of the pressure sensor range; the second set value is 50% to 75% of the maximum bursting force collected by the pressure sensor.

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