Aluminum profile bending resistance sensing detection device

Abstract

The present application relates to aluminum profile performance detection technical field, specifically it is a kind of aluminum profile bending resistance sensing detection device. Including workbench, pressure part, support part and sensing detection module, the pressure part includes two telescopic cylinders, the support part is between two telescopic cylinders;The sensing detection module includes elastic detection belt, detection belt is attached to the side of aluminum profile bending position, the detection belt is laid along the length direction of the aluminum profile, the length direction of the detection belt is evenly distributed with several detection strips, the detection belt is detachably connected with resistance wire and power supply belt, the resistance wire is connected to the upper portion of adjacent detection strip, the power supply belt is connected to the lower portion of detection strip, the resistance wire, adjacent two detection strips and power supply belt are connected to form detection loop, when the detection belt follows aluminum profile and generates deformation, the resistance of the detection loop increases. It can continuously, distributedly perceive the deformation degree of the entire bending area.

Description

Technical Field

[0001] This invention relates to the field of aluminum profile performance testing technology, specifically to a sensor and testing device for the bending resistance of aluminum profiles. Background Technology

[0002] Aluminum profiles are widely used in construction, transportation, aerospace, and other fields due to their excellent properties such as lightweight, high strength, and corrosion resistance. Bending resistance is one of the key indicators for evaluating the structural performance of aluminum profiles, directly affecting their safety and reliability in practical applications. Therefore, accurate and efficient bending resistance testing of aluminum profiles is crucial.

[0003] Currently, traditional methods for testing the bending strength of aluminum profiles mostly employ three-point or four-point bending tests. These tests involve applying concentrated loads using large testing machines and measuring the deflection or strain of the profile using displacement sensors or strain gauges, thereby calculating its bending strength or modulus. However, these traditional methods have the following shortcomings: Complex and costly equipment: It usually requires large, precision universal testing machines and supporting data acquisition systems. The equipment investment and maintenance costs are high, and it is not convenient for rapid testing on-site or on the production line.

[0004] Limitations of measurement points: Traditional displacement or strain measurements are usually taken at a single point or a few points, which makes it difficult to comprehensively and continuously reflect the complete deformation state and strain distribution of aluminum profiles during bending, especially in the bending area (stress concentration area).

[0005] Therefore, there is an urgent need to develop an aluminum profile bending resistance sensing and detection device with a relatively simple structure that can achieve continuous fitting detection of deformation areas and flexibly adapt to different detection scenarios. Summary of the Invention

[0006] To address the above problems, this invention provides a sensor and detection device for the bending resistance of aluminum profiles.

[0007] The technical solution adopted by the present invention to solve its technical problem is: an aluminum profile bending resistance sensing and detection device, including a worktable, a pressure part, a support part and a sensing and detection module. The pressure part is connected to the upper part of the worktable and includes two telescopic cylinders. The support part is connected to the lower part of the worktable and is located between the two telescopic cylinders. The lower part of the support part is rotatably connected to two support trays. The aluminum profile is placed horizontally on the top of the support part and on the two support trays. The sensing module includes an elastic detection strip that fits against the side of the aluminum profile at the bending position. The detection strip is laid along the length of the aluminum profile, and several detection strips are evenly distributed along the length of the detection strip. The detection strip is detachably connected to a resistance wire and a power supply strip. The resistance wire is connected to the upper part of an adjacent detection strip, and the power supply strip is connected to the lower part of the detection strip. The resistance wire, two adjacent detection strips, and the power supply strip are connected to form a detection loop. When the detection strip deforms along with the aluminum profile, the resistance of the detection loop increases.

[0008] As an optimization, the support part includes a support base, and a support block is detachably connected to the top of the support base. The upper part of the support block is arc-shaped, and the support block is used to support the bending position of the aluminum profile. A spring shaft is provided at the lower part of the support base, and a support arm is connected to the spring shaft. The support tray is connected to the outer end of the support arm.

[0009] As an optimization, a pressure block is connected to the lower end of the telescopic cylinder. The lower part of the pressure block is arc-shaped, and the pressure block is arranged opposite to the support tray.

[0010] As an optimization, an insulating layer is provided on the outer side of the detection strip. The insulating layer has an upper connecting groove and a lower connecting port. The upper connecting groove is used to accommodate the resistance wire, and the lower connecting port is used to accommodate the power supply strip. A power supply line is provided inside the power supply strip, and the power supply line is connected to a power supply contact. The power supply contact is used to connect the detection strip.

[0011] As an optimization, the detection strip is made of thermoplastic material, and a telescopic rod is provided at the top of the support part. The extended end of the telescopic rod is connected to an arc-shaped heating strip. After the detection strip deforms along with the aluminum profile, the heating strip heats the detection strip, causing it to undergo thermoplastic deformation.

[0012] As an optimization, the detection strip is L-shaped, with the horizontal section of the detection strip attached to the top of the aluminum profile and the vertical section of the detection strip attached to the side of the aluminum profile; the detection strip is L-shaped. The power supply strip is connected to the lower part of the vertical section of the detection strip, and the resistance wire is connected to the upper part of the vertical section of the detection strip. When both ends of the aluminum profile are bent downwards, the detection strip deforms synchronously with the aluminum profile, the distance between the upper parts of two adjacent detection strips increases, and the resistance of the detection circuit increases.

[0013] As an optimization, a connecting groove is provided on the upper part of the support base, and the support block is detachably connected to the connecting groove.

[0014] As an optimization, the two telescopic cylinders are symmetrically arranged along the axis of the support portion, and a pressure sensor is disposed between the telescopic cylinder and the pressure block.

[0015] As an optimization, a fixing block is also included, which is detachably connected to the aluminum profile and is used to fix the detection strip.

[0016] The beneficial effects of this plan are as follows: By setting up an elastic detection strip and attaching it to the side of the aluminum profile at the bending point, multiple detection strips are evenly distributed along the length of the detection strip. When the aluminum profile bends, the detection strip deforms accordingly, causing a change in the resistance of the detection circuit composed of resistance wires, adjacent detection strips, and a power supply strip. This design can continuously and distributedly sense the degree of deformation throughout the bending area, providing a more comprehensive reflection of the material's bending performance compared to single-point measurement, thus improving the accuracy and reliability of the detection. The testing strip can be made of thermoplastic deformable material, and after testing, it undergoes plastic deformation through a heating strip, allowing it to "memorize" the maximum deformation state of the aluminum profile and provide a direct reference for subsequent analysis. The L-shaped testing strip and L-shaped testing bar design allow it to fit the top and sides of the profile simultaneously, making it more suitable for testing conditions where both ends are bent downwards, thus offering greater adaptability. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention.

[0018] Figure 2 This is a schematic diagram of the back axis of the present invention.

[0019] Figure 3 This is a schematic diagram of the main view of the present invention.

[0020] Figure 4 For the present invention Figure 3 A schematic diagram of the AA cross-section structure.

[0021] Figure 5 For the present invention Figure 4 A magnified structural diagram of part B.

[0022] Figure 6 For the present invention Figure 5 A magnified structural diagram of part C.

[0023] Figure 7 This is a schematic diagram of the sensor detection module in use according to the present invention.

[0024] Figure 8 For the present invention Figure 7 A magnified structural diagram of part D.

[0025] Figure 9 This is a schematic diagram of the sensing and detection module structure of the present invention.

[0026] Figure 10 For the present invention Figure 9 A magnified structural diagram of part E.

[0027] Figure 11 This is a schematic diagram of the detection belt side of the present invention.

[0028] Figure 12 This is a schematic diagram of the resistance wire and power supply strip structure of the present invention.

[0029] The components are: 1. workbench; 2. telescopic cylinder; 3. support base; 4. support block; 5. spring shaft; 6. support tray; 7. detection belt; 8. detection strip; 9. resistance wire; 10. power supply belt; 11. pressure block; 12. insulation layer; 13. telescopic rod; 14. heating strip; 15. fixing block. Detailed Implementation

[0030] like Figure 1 As shown, an aluminum profile bending resistance sensing and detection device includes a workbench 1, a pressure section, a support section, and a sensing and detection module. The pressure section is connected to the upper part of the workbench 1 and includes two telescopic cylinders 2. The support section is connected to the lower part of the workbench 1 and is located between the two telescopic cylinders 2. The lower part of the support section is rotatably connected to two support trays 6. The aluminum profile is placed horizontally on the top of the support section and on the two support trays 6. The sensing module includes an elastic sensing band 7, which is attached to the side of the aluminum profile at the bending position. The sensing band 7 is laid along the length of the aluminum profile, and several sensing strips 8 are evenly distributed along the length of the sensing band 7. The sensing band 7 is detachably connected to a resistance wire 9 and a power supply strip 10. The resistance wire 9 is connected to the upper part of an adjacent sensing strip 8, and the power supply strip 10 is connected to the lower part of the sensing strip 8. The resistance wire 9, two adjacent sensing strips 8, and the power supply strip 10 are connected to form a sensing circuit. When the sensing band 7 deforms along with the aluminum profile, the resistance of the sensing circuit increases.

[0031] The workbench 1 can be made of high-strength cast iron or welded steel (such as Q235 steel), with rust prevention and precision machining treatment to ensure overall rigidity and stability. The pressure section is fixed to the upper crossbeam of the workbench 1 by high-strength bolts. The two telescopic cylinders 2 can be servo electric cylinders or high-precision hydraulic cylinders to achieve precise and programmable control of loading force and displacement. The support section is fixed to the lower part of the workbench 1 by a base, located between the two telescopic cylinders 2. The surface of the support tray 6 can be inlaid with wear-resistant rubber or polyurethane gaskets to protect the surface of the aluminum profile and increase friction. After the aluminum profile is placed horizontally, its two ends are supported by the support tray 6, and the middle bending area is supported by the top of the support section, thus simulating the "simply supported at both ends, loaded in the middle" or similar working conditions in actual engineering.

[0032] like Figure 1As shown, the support part includes a support base 3, and a support block 4 is detachably connected to the top of the support base 3. The upper part of the support block 4 is arc-shaped, and the support block 4 is used to support the bending position of the aluminum profile. A spring shaft 5 is provided at the lower part of the support base 3, and a support arm is connected to the spring shaft 5. The support tray 6 is connected to the outer end of the support arm.

[0033] The support base 3 is a box-shaped or column structure with internal counterweights or reinforcing ribs. The support block 4 is detachably connected to the connecting groove on the top of the support base 3 via a dovetail groove, T-slot, or locating pin, facilitating the replacement of support blocks 4 with different curvatures according to the cross-sectional shape of the aluminum profile (such as rectangular or I-shaped). The support block 4 can be made of hardened tool steel or hard chrome plated. The upper arc-shaped design facilitates stress concentration and forms line contact with the profile, reducing errors caused by deformation of the contact surface. The spring shaft 5 is built into the lower part of the support base 3 and is essentially a guide bushing assembly with a built-in compression spring. It allows the support arm and support tray 6 to float elastically in the vertical direction to adapt to the slight displacement caused by the bending of the aluminum profile, maintain stable support force, and avoid rigid constraints.

[0034] like Figure 1 As shown, the lower end of the telescopic cylinder 2 is connected to a pressure block 11, the lower part of the pressure block 11 is arc-shaped, and the pressure block 11 is arranged opposite to the support tray 6.

[0035] The lower end of the telescopic cylinder 2 is connected to the pressure block 11 via a flange or thread. The lower part of the pressure block 11 is also machined into an arc shape, and the material can be the same as that of the support block 4. Its arc surface is vertically aligned with the position of the support tray 6 below, ensuring that when a vertically downward load is applied to both ends of the aluminum profile, the action and reaction forces are aligned, preventing the generation of torque. A high-precision pressure sensor (such as a strain gauge or piezoelectric type, with a range of 0-10kN and an accuracy of 0.5%FS) can be integrated between the pressure block 11 and the piston rod of the telescopic cylinder 2 for real-time monitoring and feedback of the applied load value.

[0036] like Figure 8 and Figure 9 As shown, an insulating layer 12 is provided on the outer side of the detection strip 7. The insulating layer 12 has an upper connecting groove and a lower connecting port. The upper connecting groove is used to accommodate the resistance wire 9, and the lower connecting port is used to accommodate the power supply strip 10. A power supply line is provided inside the power supply strip 10. The power supply line is connected to a power supply contact, and the power supply contact is used to connect the detection strip 8.

[0037] The insulating layer 12 wrapped around the outer side of the detection strip 7 can be made of flexible silicone or polyimide film to ensure that it does not crack under repeated deformation and can withstand a certain temperature. An upper connecting groove and a lower connecting port are precisely machined on the insulating layer 12. The upper connecting groove is used to embed and fix the resistance wire 9, which can be made of constantan or nickel-chromium alloy wire, providing a stable resistance-strain relationship. The lower connecting port is used to insert the power supply strip 10, which is a flexible printed circuit or a flat cable wrapped with insulation. Its internal power supply lines (such as copper foil conductors) are spaced with metal spring pins or gold-plated bumps as power supply contacts. When the detection strip 7 is installed in place, the power supply contacts reliably contact the lower part of each detection strip 8 through elasticity, forming an electrical connection.

[0038] like Figure 2 and Figure 4 As shown, the detection strip 7 is made of thermoplastic material. The top of the support part is equipped with a telescopic rod 13. The extended end of the telescopic rod 13 is connected to an arc-shaped heating strip 14. After the detection strip 7 deforms along with the aluminum profile, the heating strip 14 heats the detection strip 7, causing the detection strip 7 to undergo thermoplastic deformation.

[0039] The substrate of the test strip 7 can be made of thermoplastic polyurethane, modified PVC, or shape memory polymer. After the aluminum profile bending test is completed, the test strip 7 has undergone elastic deformation. At this time, the control telescopic rod 13 (which can be a small electric push rod) extends, so that the heating strip 14 at its end (with an internal nickel-chromium alloy heating wire and an external ceramic or mica insulating sheath) comes close to or slightly touches the test strip 7. Electric heating is applied to above the material's glass transition temperature (e.g., 60-120°C, depending on the specific material) and held for several seconds. The test strip 7 undergoes thermoplastic deformation and solidifies, permanently preserving the bending profile of the aluminum profile under maximum load. After cooling, it is removed. This "memory" shape can serve as a visual physical record for offline verification or digital scanning.

[0040] like Figure 6 As shown, the detection strip 7 is L-shaped, the horizontal section of the detection strip 7 is attached to the top of the aluminum profile, the vertical section of the detection strip 7 is attached to the side of the aluminum profile, and the detection bar 8 is L-shaped; The power supply strip 10 is connected to the lower part of the vertical section of the detection strip 8, and the resistance wire 9 is connected to the upper part of the vertical section of the detection strip 8. When the two ends of the aluminum profile are bent downwards, the detection strip 7 deforms synchronously with the aluminum profile, the distance between the upper parts of two adjacent detection strips 8 increases, and the resistance of the detection circuit increases.

[0041] When primarily detecting downward bending at both ends of an aluminum profile, an L-shaped detection strip 7 and an L-shaped detection bar 8 are used. The detection bar 8 can be made of conductive metal wire, etched metal foil, or plastic mixed with conductive filler. The L-shaped design ensures that its horizontal section fits tightly against the upper surface of the profile, and its vertical section fits tightly against the side. When the profile bends downward, its upper surface is compressed, and its side is stretched, allowing for a more comprehensive detection of this combined deformation. A resistance wire 9 contacts the upper part of the vertical section of the detection bar 8, and a power supply strip 10 connects to the lower part. During bending, the distance between the upper ends of the vertical sections of adjacent detection bars 8 increases, causing adjacent detection bars 8 to move along the resistance wire 9, increasing the length of the resistance wire 9 between them, thus significantly increasing the resistance value of the entire detection circuit. By measuring the change in resistance, the strain distribution in that area can be deduced.

[0042] like Figure 1 As shown, the upper part of the support base 3 is provided with a connecting groove, and the support block 4 is detachably connected to the connecting groove.

[0043] The connecting groove can limit the support block 4 and prevent the support block 4 from shifting during operation.

[0044] like Figure 1 As shown, the two telescopic cylinders 2 are symmetrically arranged along the axis of the support portion, and a pressure sensor is disposed between the telescopic cylinder 2 and the pressure block 11.

[0045] like Figure 7 As shown, it also includes a fixing block 15, which is detachably connected to the aluminum profile and is used to fix the detection belt 7.

[0046] How to use: When using this device, a suitable support block 4 is selected and installed on the support base 3 according to the specifications (length, cross-sectional shape) of the aluminum profile to be tested.

[0047] Select a test strip 7 that matches the testing conditions. Embed the resistance wire 9 into the upper connecting groove of the test strip 7, and insert the power supply strip 10 into the lower connecting port, ensuring a reliable electrical connection. Connect the wire of the power supply strip 10 to the external resistance measurement circuit, and initially attach the test strip 7 to the preset bending area of ​​the aluminum profile using the fixing block 15.

[0048] Place the aluminum profile horizontally so that its two ends are securely supported on the two support trays 6, with the middle bent area in contact with the support block 4.

[0049] Adjust the height of the two telescopic cylinders 2 so that the pressure blocks 11 below are aligned with the loading points on the upper surfaces of both ends of the aluminum profile. Check again and ensure that the detection strip 7 is in close contact with the profile surface, and adjust the fixing blocks 15 if necessary.

[0050] Start the control unit to power on and preheat the pressure sensor and resistance measurement circuit. In the unloaded state, record the initial value of the pressure sensor (which should be close to zero) and the reference resistance value of each detection loop to "zero" the system.

[0051] The loading program is set by the control unit and the test is started. The two telescopic cylinders 2 move downward synchronously and apply load to both ends of the aluminum profile through the pressure block 11.

[0052] The control system collects and records in real time: A) the load value (F) fed back by the pressure sensor; B) the displacement of the telescopic cylinder 2 (or the deflection of the aluminum profile measured by an additional displacement sensor); C) the change value (ΔR) of the resistance of each detection loop detected by the sensing module. Depending on the deformation of the aluminum profile, the length of the resistor in each detection loop is different, and thus the measured resistance value is also different.

[0053] Loading stops when the load reaches the preset maximum value or when the aluminum profile yields / breaks.

[0054] If the "deformation memory" function is required, maintain the load and then activate the telescopic rod 13 to heat and shape the detection strip 7 with the heating strip 14. After shaping is complete, retract the heating strip 14.

[0055] Control the telescopic cylinder 2 to slowly rise, completely unload, and remove the aluminum profile and the shaped inspection belt 7.

[0056] All moving parts are reset, and the power is turned off.

[0057] Macroscopic mechanical parameters such as bending stiffness and yield strength are calculated based on the collected load-displacement data.

[0058] Based on the change in resistance (ΔR) and the pre-calibrated resistance-strain relationship curve, a strain distribution diagram along the length of the bending area of ​​the aluminum profile is drawn to analyze the stress concentration.

[0059] By combining the shape of the shaped test strip 7, a direct assessment of the bending morphology can be performed.

[0060] A flexible detection strip 7 is tightly fitted to the bending area of ​​the aluminum profile to be tested. Multiple independent detection strips 8 are uniformly integrated along the length of the detection strip 7. Each detection strip 8, together with adjacent detection strips 8, a shared resistance wire 9, and a power supply strip 10, forms an independent detection loop. When the aluminum profile bends, causing tensile deformation of the detection strip 7, it directly causes a change in the effective length of the resistance wire 9 in the loop, which manifests as a change in the resistance value of the loop. This forms a continuous deformation sensing method based on the flexible detection strip 7 and the distributed detection loop, enabling continuous, distributed, and synchronous measurement of the strain field of the entire bending area. It can acquire complete strain distribution data along the length direction at once, rather than data from individual points, greatly improving the comprehensiveness and precision of the detection, and is particularly adept at capturing gradient changes in stress concentration areas.

[0061] The test strip 7 is made of a thermoplastic deformable material. After the bending test is completed, the heating strip 14 is driven by the telescopic rod 13 to locally heat the deformed test strip 7, causing it to undergo plastic deformation and then cool and solidify. This allows the test strip 7 to permanently maintain the actual bending profile of the aluminum profile under maximum load, generating an intuitive and storable physical "mold" or record. This provides a physical and visual analysis method that traditional electrical signal data does not have for subsequent offline verification, 3D scanning comparison, or as a training demonstration sample.

[0062] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any aluminum profile bending resistance sensing and detection device that conforms to the claims of the present invention, and any appropriate changes or modifications made to it by those skilled in the art, shall fall within the patent protection scope of the present invention.

Claims

1. A sensor and detection device for the bending resistance of aluminum profiles, characterized in that: The device includes a workbench (1), a pressure section, a support section, and a sensing and detection module. The pressure section is connected to the upper part of the workbench (1) and includes two telescopic cylinders (2). The support section is connected to the lower part of the workbench (1) and is located between the two telescopic cylinders (2). The lower part of the support section is rotatably connected to two support trays (6). The aluminum profile is placed horizontally on the top of the support section and on the two support trays (6). The sensing module includes an elastic detection strip (7) that fits against the side of the aluminum profile at the bending position. The detection strip (7) is laid along the length of the aluminum profile. Several detection strips (8) are evenly distributed along the length of the detection strip (7). The detection strip (7) is detachably connected to a resistance wire (9) and a power supply strip (10). The resistance wire (9) is connected to the upper part of the adjacent detection strip (8), and the power supply strip (10) is connected to the lower part of the detection strip (8). The resistance wire (9), two adjacent detection strips (8), and the power supply strip (10) are connected to form a detection circuit. When the detection strip (7) deforms along with the aluminum profile, the resistance of the detection circuit increases.

2. The aluminum profile bending resistance sensing and detection device according to claim 1, characterized in that: The support part includes a support base (3), and a support block (4) is detachably connected to the top of the support base (3). The upper part of the support block (4) is arc-shaped, and the support block (4) is used to support the bending position of the aluminum profile. The lower part of the support base (3) is provided with a spring shaft (5), the spring shaft (5) is connected to a support arm, and the support tray (6) is connected to the outer end of the support arm.

3. The aluminum profile bending resistance sensing and detection device according to claim 1, characterized in that: The lower end of the telescopic cylinder (2) is connected to a pressure block (11), the lower part of the pressure block (11) is arc-shaped, and the pressure block (11) is arranged opposite to the support tray (6).

4. The aluminum profile bending resistance sensing and detection device according to claim 1, characterized in that: An insulating layer (12) is provided on the outside of the detection strip (7). The insulating layer (12) has an upper connecting groove and a lower connecting port. The upper connecting groove is used to accommodate the resistance wire (9), and the lower connecting port is used to accommodate the power supply strip (10). A power supply line is provided inside the power supply strip (10). The power supply line is connected to a power supply contact. The power supply contact is used to connect the detection strip (8).

5. The aluminum profile bending resistance sensing and detection device according to claim 1, characterized in that: The detection strip (7) is made of thermoplastic material. The top of the support part is equipped with a telescopic rod (13). The extended end of the telescopic rod (13) is connected to an arc-shaped heating strip (14). After the detection strip (7) deforms along with the aluminum profile, the heating strip (14) heats the detection strip (7) to cause thermoplastic deformation.

6. The aluminum profile bending resistance sensing and detection device according to claim 1, characterized in that: The detection strip (7) is L-shaped, with the horizontal section of the detection strip (7) attached to the top of the aluminum profile and the vertical section of the detection strip (7) attached to the side of the aluminum profile. The detection strip (8) is L-shaped. The power supply strip (10) is connected to the lower part of the vertical section of the detection strip (8), and the resistance wire (9) is connected to the upper part of the vertical section of the detection strip (8). When the two ends of the aluminum profile are bent downward, the detection strip (7) deforms synchronously with the aluminum profile, the distance between the upper parts of two adjacent detection strips (8) increases, and the resistance of the detection circuit increases.

7. The aluminum profile bending resistance sensing and detection device according to claim 2, characterized in that: The upper part of the support base (3) is provided with a connecting groove, and the support block (4) is detachably connected to the connecting groove.

8. The aluminum profile bending resistance sensing and detection device according to claim 3, characterized in that: The two telescopic cylinders (2) are symmetrically arranged along the axis of the support portion, and a pressure sensor is arranged between the telescopic cylinders (2) and the pressure block (11).

9. The aluminum profile bending resistance sensing and detection device according to claim 1, characterized in that: It also includes a fixing block (15), which is detachably connected to the aluminum profile and is used to fix the detection strip (7).

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