Multiple sample detection simultaneous site extension assay device

Abstract

A kind of multi-sample detection synchronous position stretching test device, assembly substrate front high rear low obliquely fixed installation is installed on the stretching frame;Lower clamping mechanism transversely fixedly installed on the rear of the plate surface of assembly substrate, and the upper end is sequentially spaced in length direction and is provided with a plurality of lower clamps;Upper clamping mechanism is transversely arranged above lower clamping mechanism, and with the upper plate surface of assembly substrate sliding cooperation, upper clamping mechanism includes upper stretching beam, and the left and right ends of upper stretching beam are symmetrically provided with two through holes;The lower end of upper stretching beam is sequentially provided with a plurality of upper clamps in length direction, and a plurality of upper clamps and a plurality of lower clamps form a plurality of pairs of chuck in one-to-one correspondence;Drive mechanism is installed on assembly substrate, and it includes two linear drive assemblies, and is connected with upper stretching beam, for driving upper clamping mechanism to linearly reciprocate.This device structure is compact, operation process is simple, can be compared to a plurality of samples under the condition of completely same environmental parameters Synchronous stretching test.

Description

Technical Field

[0001] This utility model belongs to the field of tensile testing technology, specifically a tensile testing machine for multi-sample testing. Background Technology

[0002] A tensile testing machine, also known as a material tensile testing machine or a universal tensile strength testing machine, is a mechanical testing device used to test samples. It is suitable for testing the mechanical properties of metallic and non-metallic materials and is an indispensable testing device for material development, physical property testing, teaching research, and quality control.

[0003] Existing tensile testing machines have relatively limited functionality. Currently, most tensile testing machines on the market are of a vertical structure, typically using two single clamps to form a pair for vertical tensile testing of a single sample. Because there is only one pair of clamps, simultaneous testing of multiple samples is not possible, resulting in low efficiency. Furthermore, this type of tensile testing machine cannot guarantee that the environmental parameters are completely identical for each sample when conducting tests on multiple samples. To enable comparative tensile testing of multiple samples under identical environmental parameters, there is an urgent need for a multi-sample synchronous tensile testing device. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a multi-sample synchronous tensile testing device. This device has a compact structure, small footprint, simple operation, and is easy to maintain. It can simultaneously conduct comparative tensile tests on multiple samples under completely identical environmental parameters, significantly improving testing efficiency in batch sample tensile operations.

[0005] To achieve the above objectives, this utility model provides a multi-sample synchronous tensile testing device, including a tensile frame, an assembly base plate, a lower clamping mechanism, an upper clamping mechanism, and a driving mechanism.

[0006] The assembly substrate is fixedly mounted on the stretching machine frame with the front higher than the back;

[0007] The lower clamping mechanism is horizontally fixedly installed on the rear part of the upper surface of the assembly base plate, and multiple lower clamps are arranged at intervals along the length direction at its upper end.

[0008] The upper clamping mechanism is horizontally positioned above the lower clamping mechanism and slides in cooperation with the upper surface of the assembly substrate. The upper clamping mechanism includes an upper tension beam, and two through holes are symmetrically opened at the left and right ends of the upper tension beam. Multiple upper clamps are sequentially arranged along the length direction at the lower end of the upper tension beam, and the multiple upper clamps and multiple lower clamps correspond one-to-one to form multiple pairs of clamps.

[0009] The drive mechanism is mounted on the assembly base plate and includes two linear drive components. The two linear drive components are symmetrically distributed on the left and right sides of the upper surface of the assembly base plate, corresponding to the two through holes. Each linear drive component includes an upper bearing seat, a lower bearing seat, a lead screw nut, a lead screw, a motor bracket, and a geared motor. The upper and lower bearing seats are distributed above and below the through holes, respectively, and are mounted on the upper and lower parts of the upper surface of the assembly base plate. The lead screw nut is fixedly installed in the through hole of the upper tension beam. The lead screw is threaded into the lead screw nut, and its two ends are rotatably connected to the upper and lower bearing seats via the upper and lower bearings, respectively. The geared motor is mounted on the assembly base plate via the motor bracket, and its output shaft is connected to the lower end of the lead screw via a coupling.

[0010] Furthermore, to ensure good stability and adjustable clamping position of the lower clamping mechanism, the lower clamping mechanism includes a lower tension beam and multiple lower clamping units. The lower tension beam is horizontally fixedly connected to the assembly base plate. The upper end of the lower tension beam has a horizontally extending strip-shaped mounting groove, with multiple external positioning holes spaced apart along its length and communicating with the strip-shaped mounting groove. The multiple lower clamping units are distributed one-to-one with the multiple external positioning holes. Each lower clamping unit includes a connecting block, clamping pins, adjusting blocks, lower clamps, locking bolts, limiting blocks, long guide rods, and fine-tuning components. Bolts; the dimensions of the connecting block are adapted to the dimensions of the strip mounting groove and are inserted into the strip mounting groove. An inner positioning hole is formed in the middle of the connecting block at the position corresponding to the outer positioning hole, and two threaded holes A are symmetrically formed on the upper end. The clamping pin is simultaneously inserted into the outer positioning hole and the inner positioning hole to position and connect the connecting block inside the lower tension beam. An adjusting groove extending along the height direction is formed inside the adjusting block. An upper mounting hole and a lower mounting hole communicating with the adjusting groove are respectively formed in the central areas of its upper and lower ends. Symmetrically formed holes communicating with the adjusting groove are formed on the left and right sides of the lower mounting hole at its lower end. The two guide holes correspond to two lower threaded holes A respectively; the lower clamp is located in the upper center area of ​​the adjusting block, and includes a lower chuck and a lower threaded sleeve. The lower chuck is a U-shaped frame with a notch in the upper center area; the lower threaded sleeve is fixedly connected to the lower center area of ​​the lower chuck; the locking bolt passes through the upper mounting hole on the adjusting block and is threaded into the lower threaded sleeve to fix the lower clamp to the upper end of the adjusting block; the limiting block is slidably set in the adjusting groove, and the center area of ​​the limiting block has an adjusting screw hole at the position corresponding to the lower mounting hole, and its lower end is adjusted... Two upper threaded holes A are symmetrically provided on the left and right sides of the screw hole, and the two upper threaded holes A correspond to the two lower threaded holes A respectively; the upper end and lower end of the long guide rod are respectively provided with an upper threaded section A and a lower threaded section A; the two long guide rods are slidably inserted into the two guide holes, and the upper threaded sections A of the two long guide rods are respectively inserted into the two upper threaded holes A on the limit block through thread engagement, and the lower threaded sections A of the two long guide rods are respectively inserted into the two lower threaded holes A on the connecting block through thread engagement; the fine-tuning bolt passes through the lower mounting hole on the adjusting block and is inserted into the adjusting screw hole on the limit block through thread engagement.

[0011] In this technical solution, the tension beam is horizontally fixedly mounted on the assembly base plate, providing a stable support foundation for multiple lower clamping units. A strip-shaped mounting groove is formed at the upper end of the tension beam, with multiple external positioning holes communicating with the groove. Simultaneously, a connecting block is provided at the lower end of the lower clamping unit, with an internal positioning hole. Thus, in establishing the connection between the lower clamping unit and the lower tension beam, simply insert the connecting block into the strip-shaped mounting groove, and then insert the clamping pin into the aligned external and internal positioning holes, achieving a rapid and stable assembly process between the lower clamping unit and the lower tension beam. Furthermore, after removing the clamping pin, the lower clamping unit can be quickly detached from the lower tension beam, facilitating convenient maintenance. An adjusting groove is formed inside the adjusting block, allowing the limiting block to have displacement capability within the adjusting groove. An upper mounting hole is provided at the center of the upper end of the adjusting block, and a lower threaded sleeve is provided in the lower clamp. This allows the lower clamp to be fixed to the upper end of the adjusting block using a locking bolt passing through the upper mounting hole. Simultaneously, the lower clamp can be quickly disengaged from the adjusting block by removing the locking bolt. Two lower threaded holes A are provided at the upper end of the connecting block, and two upper threaded holes A are provided on the limiting block corresponding to the two lower threaded holes A. Two guide holes are also provided on the adjusting block. This allows two guide rods, slidably inserted into the two guide holes, to establish a fixed connection between the limiting block and the connecting block. Based on this, an adjusting screw hole is opened in the center of the limiting block, and a lower mounting hole is opened at the lower end of the adjusting block. The fine-tuning bolt passing through the lower mounting hole can be inserted into the adjusting screw hole of the limiting block through thread engagement. Due to the presence of two guide rods, the distance between the limiting block and the connecting block can be changed by rotating the fine-tuning bolt. Thus, the distance between the lower clamp and the connecting block can be adjusted. In this way, when the sample has dimensional errors caused by the process, the initial displacement of the sample can be made to 0 by adjusting the height of the lower clamp, which is convenient for performing tensile tests of the same tensile scale simultaneously with other samples.

[0012] Furthermore, to ensure good stability of the upper clamping mechanism and to enable each upper clamping unit to acquire tensile signals, the upper clamping mechanism also includes multiple upper clamping units; these multiple upper clamping units are distributed one-to-one with multiple lower clamping units; each upper clamping unit includes a force sensor, a connecting rod, and an upper clamp; the force sensor is fixedly connected to the lower end of the upper tension beam, and a connecting rod threaded hole is opened in the central area of ​​the force sensor; the upper and lower ends of the connecting rod are respectively provided with an upper threaded section B and a lower threaded section B, and the upper threaded section B is inserted into the connecting rod threaded hole through threaded engagement; the upper clamp includes an upper chuck and an upper threaded sleeve, the upper chuck being a U-shaped frame with a notch in the central area of ​​its lower end; the upper threaded sleeve is fixedly connected to the central area of ​​the upper end of the upper chuck and is fitted onto the outside of the lower threaded section B of the connecting rod through threaded engagement.

[0013] In this technical solution, a force sensor is installed at the upper end of each upper clamping unit, which facilitates the real-time acquisition of tensile force signals during the stretching process. This allows for simultaneous acquisition of real-time tensile force data during the stretching process. The upper clamp is connected to the connecting rod via an upper threaded sleeve, enabling rapid assembly and disassembly of the upper clamp and facilitating efficient maintenance.

[0014] Furthermore, to ensure the stability of the assembly substrate support, the stretching frame includes long legs, short legs, crossbeams, longitudinal beams, and feet; two long legs are distributed opposite each other on the left and right; two short legs are distributed correspondingly on the rear side of the two long legs; two crossbeams are distributed opposite each other front and back, with the two ends of the front crossbeam fixedly connected to the bottom of the two long legs respectively, and the two ends of the rear crossbeam fixedly connected to the bottom of the two short legs respectively; two longitudinal beams are distributed opposite each other on the left and right, with the two ends of each longitudinal beam fixedly connected to the bottom of the long and short legs on the same side respectively; the number of feet is four, of which two feet are fixedly connected to the lower ends of the two long legs, and the other two feet are fixedly connected to the lower ends of the two short legs.

[0015] Furthermore, to achieve fully automated control of the stretching process, an upper proximity switch, a lower proximity switch, an alarm module, and a controller are also included. The upper proximity switch is installed below the upper bearing housing in the left linear drive assembly, and the lower proximity switch is installed above the lower bearing housing in the left linear drive assembly. The alarm module is installed on the stretching frame. The controller is installed on the stretching frame and is connected to the force sensor, the upper proximity switch, the lower proximity switch, the geared motor, and the alarm module, respectively.

[0016] Preferably, the lower extension beam is fixedly connected to the assembly base plate by a shim block. Preferably, the assembly base plate is made of thick steel plate; the long support leg, short support leg, crossbeam and longitudinal beam are all made of rectangular cold-formed hollow steel.

[0017] Furthermore, to improve driving accuracy, the lead screw is a trapezoidal lead screw; the lead screw nut is a trapezoidal nut; and the motor in the geared motor is a stepper motor. Because the trapezoidal lead screw has a self-locking structure and will not move on its own, the driving accuracy of the upper tension beam can be further improved.

[0018] Furthermore, in order to conduct tensile tests on 10 samples under exactly the same experimental conditions, the number of the upper clamping monomer and the multiple lower clamping monomers are both 10.

[0019] In this invention, the mounting base is tilted to provide an inclined plane for the tensile testing of the sample. During the tensile process, the sample is subjected to the combined effects of axial tensile force and gravitational components, creating a composite stress state that leads to non-uniform deformation. This allows for a better assessment of the sample's true performance under complex load conditions. Multiple lower clamps are positioned along the length of the upper end of the fixed lower clamping mechanism, while multiple upper clamps are positioned along the length of the lower end of the movable upper clamping mechanism. This facilitates the formation of multiple pairs of clamps, allowing for simultaneous tensile testing of multiple samples. The tensile process of multiple samples can be performed synchronously, ensuring that the environmental parameters of each sample are completely identical during the experiment. This results in more accurate tensile test data and facilitates comparison of the material strength of different samples under the same tensile conditions. Furthermore, this method of simultaneously conducting tensile tests on multiple samples significantly improves testing efficiency and greatly reduces the testing time when performing batch tensile tests. The upper and lower bearing housings serve as the supporting foundations for the lead screw at both ends, with the lead screw connected to the bearing housings via bearings. Simultaneously, a geared motor is connected to one end of the lead screw. This ensures a more stable and smooth rotation of the lead screw during motor-driven rotation. Two through holes are formed at both ends of the upper tension beam, and lead screw nuts are installed in these holes. Based on this, the rotational motion of the lead screw is converted into the linear displacement motion of the upper tension beam using the nuts and the upper tension beam, which slides against the surface of the mounting base. This allows for stable, efficient, and precise linear reciprocating movement of the upper tension beam, enabling automated tensile testing.

[0020] The device is compact, occupies little space, is simple to operate and easy to maintain. It can simultaneously conduct comparative tensile tests on multiple I-beam samples under identical environmental parameters, which can effectively reduce the adverse effects of different environmental parameters on the experimental results and help ensure the accuracy of tensile test data. At the same time, it can significantly improve the testing efficiency in batch sample tensile operations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of the lower clamping unit in this utility model;

[0023] Figure 3 This is a perspective view of the lower clamping unit in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the upper clamping unit in this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the stretching frame in this utility model.

[0026] In the diagram: 1. Stretching frame; 2. Assembly base plate; 3. Upper clamping mechanism; 4. Lower clamping mechanism; 5. Lower clamp; 6. Upper clamp; 7. Drive mechanism; 8. Lower stretching beam; 9. Lower clamping unit; 10. Strip mounting groove; 11. Adjusting block; 12. Adjusting slide; 13. Connecting block; 14. Clamping pin; 15. Long guide rod; 16. Limiting block; 17. Fine-tuning bolt; 18. Screw sleeve; 19. Lower chuck; 20. Locking screw. 21. Bolt, upper tension beam, 22. upper clamping unit, 23. Force sensor, 24. Connecting rod, 25. Elevating block, 26. Upper chuck, 27. Upper threaded sleeve, 28. Motor bracket, 29. Gear motor, 30. Screw nut, 31. Screw, 32. Upper bearing seat, 33. Lower bearing seat, 34. Motor bracket, 35. Coupling, 36. Long support leg, 37. Short support leg, 38. Crossbeam, 39. Longitudinal beam, 40. Foot. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figures 1 to 5 As shown, this utility model provides a multi-sample synchronous tensile testing device, including a tensile frame 1, an assembly base plate 2, a lower clamping mechanism 4, an upper clamping mechanism 3, and a driving mechanism 7.

[0029] The assembly base plate 2 is fixedly mounted on the stretching frame 1 with a front higher and rear lower inclination; preferably, the assembly base plate 2 is fixedly mounted on the stretching frame 1 by welding; multiple mounting holes can be pre-milled on the assembly base plate 2 to facilitate fixed connection with the lower stretching beam 8, motor bracket 35, upper bearing seat 32 and lower bearing seat 33 by bolt connection.

[0030] The lower clamping mechanism 4 is horizontally fixedly installed on the rear part of the upper surface of the assembly base plate 2, and multiple lower clamps 5 are arranged sequentially at intervals along the length direction at its upper end.

[0031] The upper clamping mechanism 3 is horizontally arranged above the lower clamping mechanism 4 and slides in cooperation with the upper plate surface of the assembly base plate 2. The upper clamping mechanism 3 includes an upper tension beam 21, which is horizontally arranged on the assembly base plate 2. Two through holes are symmetrically opened at the left and right ends of the upper tension beam 21. Multiple upper clamps 6 are arranged sequentially along the length direction at the lower end of the upper tension beam 21. The multiple upper clamps 6 and multiple lower clamps 5 correspond one-to-one to form multiple pairs of clamps.

[0032] The drive mechanism 7 is mounted on the assembly base plate 2 and includes two linear drive components. The drive mechanism 7 is used to drive the upper clamping mechanism 3 to perform linear reciprocating movement so that the upper clamping mechanism 3 can move towards the lower clamping mechanism 4 or away from the lower clamping mechanism 4. Two linear drive components are symmetrically distributed on the left and right sides of the upper surface of the assembly base plate 2, corresponding to the two through holes. The linear drive components include an upper bearing seat 32, a lower bearing seat 33, a lead screw nut 30, a lead screw 31, a motor bracket 34, and a geared motor 29. The upper bearing seat 32 and the lower bearing seat 33 are distributed above and below the through holes, respectively, and are installed at the upper and lower ends of the upper surface of the assembly base plate 2. The lead screw nut 30 is fixedly installed in the through hole of the upper tension beam 21. The lead screw 31 is threaded into the lead screw nut 30, and its two ends are rotatably connected to the upper bearing seat 32 and the lower bearing seat 33 through the upper and lower bearings, respectively. The geared motor 29 is mounted on the assembly base plate 2 through the motor bracket 34, and its output shaft is connected to the lower end of the lead screw 31 through a coupling 35.

[0033] To ensure good stability and adjustable clamping position, the lower clamping mechanism 4 includes a lower tension beam 8 and multiple lower clamping units 9. The lower tension beam 8 is horizontally fixed to the mounting base plate 2. Its upper end has a horizontally extending strip-shaped mounting groove 10, with multiple external positioning holes spaced at intervals along its length, communicating with the strip-shaped mounting groove 10. The multiple lower clamping units 9 are distributed one-to-one with the multiple external positioning holes. Each lower clamping unit 9 includes a connecting block 13, a clamping pin 14, an adjusting block 11, a lower clamp 5, a locking bolt 20, a limiting block 16, a long guide rod 15, and a fine-tuning bolt. 17; The size of the connecting block 13 is adapted to the size of the strip mounting groove 10 and is inserted into the strip mounting groove 10. The middle part of the connecting block 13 has an inner positioning hole at the position corresponding to the outer positioning hole, and two threaded holes A are symmetrically opened on the left and right sides of its upper end; The clamping pin 14 is inserted into both the outer positioning hole and the inner positioning hole to position and connect the connecting block 13 inside the lower tension beam 8; The interior of the adjusting block 11 has an adjusting groove 12 extending along the height direction. The central areas of its upper and lower ends have upper mounting holes and lower mounting holes communicating with the adjusting groove 12, respectively. The lower end has two threaded holes symmetrically opened on the left and right sides of the lower mounting hole, communicating with the adjusting groove 12. Two guide holes correspond to two lower threaded holes A respectively; the lower clamp 5 is located in the upper central area of ​​the adjusting block 11, and the lower clamp 5 includes a lower chuck 19 and a lower threaded sleeve 18. The lower chuck 19 is a U-shaped frame with a notch in the upper central area; the lower threaded sleeve 18 is fixedly connected to the lower central area of ​​the lower chuck 19; the locking bolt 20 passes through the upper mounting hole on the adjusting block 11 and is threaded into the lower threaded sleeve 18 to fix the lower clamp 5 to the upper end of the adjusting block 11; the limiting block 16 is slidably disposed in the adjusting groove 12, and the central area of ​​the limiting block 16 has an adjusting screw hole at the position corresponding to the lower mounting hole. Two upper threaded holes A are symmetrically opened on the left and right sides of the adjusting screw hole at the lower end, and the two upper threaded holes A correspond to the two lower threaded holes A respectively; the upper end and lower end of the long guide rod 15 are respectively provided with an upper threaded section A and a lower threaded section A; the two long guide rods 15 are slidably inserted into the two guide holes, and the upper threaded sections A of the two long guide rods 15 are respectively inserted into the two upper threaded holes A on the limiting block 16 through thread engagement, and the lower threaded sections A of the two long guide rods 15 are respectively inserted into the two lower threaded holes A on the connecting block 13 through thread engagement; the fine-tuning bolt 17 passes through the lower mounting hole on the adjusting block 11 and is inserted into the adjusting screw hole on the limiting block 16 through thread engagement.

[0034] In this technical solution, the tension beam is horizontally fixedly mounted on the assembly base plate, providing a stable support foundation for multiple lower clamping units. A strip-shaped mounting groove is formed at the upper end of the tension beam, with multiple external positioning holes communicating with the groove. Simultaneously, a connecting block is provided at the lower end of the lower clamping unit, with an internal positioning hole. Thus, in establishing the connection between the lower clamping unit and the lower tension beam, simply insert the connecting block into the strip-shaped mounting groove, and then insert the clamping pin into the aligned external and internal positioning holes, achieving a rapid and stable assembly process between the lower clamping unit and the lower tension beam. Furthermore, after removing the clamping pin, the lower clamping unit can be quickly detached from the lower tension beam, facilitating convenient maintenance. An adjusting groove is formed inside the adjusting block, allowing the limiting block to have displacement capability within the adjusting groove. An upper mounting hole is provided at the center of the upper end of the adjusting block, and a lower threaded sleeve is provided in the lower clamp. This allows the lower clamp to be fixed to the upper end of the adjusting block using a locking bolt passing through the upper mounting hole. Simultaneously, the lower clamp can be quickly disengaged from the adjusting block by removing the locking bolt. Two lower threaded holes A are provided at the upper end of the connecting block, and two upper threaded holes A are provided on the limiting block corresponding to the two lower threaded holes A. Two guide holes are also provided on the adjusting block. This allows two guide rods, slidably inserted into the two guide holes, to establish a fixed connection between the limiting block and the connecting block. Based on this, an adjusting screw hole is opened in the center of the limiting block, and a lower mounting hole is opened at the lower end of the adjusting block. The fine-tuning bolt passing through the lower mounting hole can be inserted into the adjusting screw hole of the limiting block through thread engagement. Due to the presence of two guide rods, the distance between the limiting block and the connecting block can be changed by rotating the fine-tuning bolt. Thus, the distance between the lower clamp and the connecting block can be adjusted. In this way, when the sample has dimensional errors caused by the process, the initial displacement of the sample can be made to 0 by adjusting the height of the lower clamp, which is convenient for performing tensile tests of the same tensile scale simultaneously with other samples.

[0035] To ensure the stability of the upper clamping mechanism and to enable each upper clamping unit to acquire a tension signal, the upper clamping mechanism 3 further includes multiple upper clamping units 22. Each upper clamping unit 22 corresponds to a different lower clamping unit 9. Each upper clamping unit 22 includes a force sensor 23, a connecting rod 24, and an upper clamp 6. The force sensor 23 is fixedly connected to the lower end of the upper tension beam 21, and a connecting rod threaded hole is formed in the central area of ​​the force sensor 23. Preferably, the force sensor 23 has multiple mounting holes around the connecting rod threaded hole, and multiple mounting threaded holes corresponding to the mounting holes are formed at the lower end of the upper tension beam 21. Multiple mounting bolts passing through the mounting holes and threadedly inserted into the mounting threaded holes are used to fix the force sensor 23 to the lower end of the upper tension beam 21. The upper and lower ends of the connecting rod 24 are respectively provided with an upper threaded section B and a lower threaded section B, and the upper threaded section B is inserted into the threaded hole of the connecting rod through threaded engagement; the upper clamp 6 includes an upper chuck 26 and an upper threaded sleeve 27, the upper chuck 26 is a U-shaped frame with a notch in the lower central area; the upper threaded sleeve 27 is fixedly connected to the upper central area of ​​the upper chuck 26, and is fitted onto the outside of the lower threaded section B of the connecting rod 24 through threaded engagement.

[0036] In this technical solution, a force sensor is installed at the upper end of each upper clamping unit, which facilitates the real-time acquisition of tensile force signals during the stretching process. This allows for simultaneous acquisition of real-time tensile force data during the stretching process. The upper clamp is connected to the connecting rod via an upper threaded sleeve, enabling rapid assembly and disassembly of the upper clamp and facilitating efficient maintenance.

[0037] To ensure the stability of the assembly substrate support, the stretching frame 1 includes long legs 36, short legs 37, crossbeams 38, longitudinal beams 39, and feet 40. Two long legs 36 are arranged opposite each other on the left and right sides. Two short legs 37 are correspondingly distributed behind the two long legs 36. Two crossbeams 38 are arranged opposite each other front and back, with the two ends of the front crossbeam 38 fixedly connected to the bottom of the two long legs 36, and the two ends of the rear crossbeam 38 fixedly connected to the bottom of the two short legs 37. Two longitudinal beams 39 are arranged opposite each other on the left and right sides, with the two ends of each longitudinal beam 39 fixedly connected to the bottom of the long leg 36 and the short leg 37 on the same side. There are four feet 40, with two feet fixedly connected to the lower ends of the two long legs 36 and the other two feet fixedly connected to the lower ends of the two short legs 37. Preferably, the stretching frame 1 is constructed by welding.

[0038] To achieve fully automated control of the stretching process, an upper proximity switch, a lower proximity switch, an alarm module, and a controller are also included. The upper proximity switch is installed below the upper bearing housing 32 in the left linear drive assembly, and the lower proximity switch is installed above the lower bearing housing 33 in the left linear drive assembly. The alarm module is installed on the stretching frame 1. The controller is installed on the stretching frame 1 and is connected to the force sensor 23, the upper proximity switch, the lower proximity switch, the geared motor 29, and the alarm module, respectively.

[0039] Preferably, the lower tension beam 8 is fixedly connected to the assembly base plate 2 via a shim block 25. Preferably, through holes are provided on the lower tension beam 8 and the shim block 25 to facilitate fixed connection with the assembly base plate 2 using bolts. Preferably, the assembly base plate 2 is made of thick steel plate; the long support leg 36, short support leg 37, crossbeam 38, and longitudinal beam 39 are all made of rectangular cold-formed hollow steel.

[0040] To improve driving accuracy, the lead screw 31 is a trapezoidal lead screw; the lead screw nut 30 is a trapezoidal nut; and the motor in the geared motor 29 is a stepper motor. Because the trapezoidal lead screw has a self-locking structure and will not move on its own, the driving accuracy of the upper tension beam can be further improved.

[0041] In order to conduct tensile tests on 10 samples under exactly the same experimental conditions, the number of the upper clamping monomer 22 and the multiple lower clamping monomers 9 are both 10.

[0042] As a preferred embodiment, since the lower clamp 5 is assembled onto the adjusting block via the threaded engagement of the lower screw sleeve 18 and the locking bolt 20, and the upper clamp 6 is assembled onto the connecting rod 24 via the threaded engagement of the upper screw sleeve 27 and the connecting rod 24, it is possible to easily replace clamps of different models and sizes, thereby enabling tensile testing of samples of different sizes. Of course, as an alternative, the upper clamp 6 and the lower clamp 5 can also be replaced to facilitate tensile testing of samples of different shapes.

[0043] Working principle: The controller synchronously controls multiple geared motors 29 to drive multiple lead screws 31 to rotate, and simultaneously drives the upper tension beam 21 to move away from the lower tension beam 8 through the lead screw nut 30. This also simultaneously moves multiple upper clamps 6 away from multiple lower clamps 5, performing a stretching operation on the sample clamped between the upper clamps 6 and lower clamps 5. When the set lifting distance, set stretching time, or tensile force exceeds a set threshold, the controller stops the multiple geared motors 29. Specifically, the upper proximity switch detects the upward position of the upper tension beam 21. When the upper tension beam 21 reaches a position close to the upper bearing seat 32, it triggers the upper proximity switch, which then sends an upper limit signal. Upon receiving the upper limit signal, the controller automatically stops the multiple geared motors 29. The lower proximity switch detects the downward position of the upper tension beam 21. When the upper tension beam 21 reaches a position close to the lower bearing seat 33, it triggers the lower proximity switch, which then sends a lower limit signal. Upon receiving the lower limit signal, the controller automatically stops the multiple geared motors 29.

[0044] How to use:

[0045] 1. Prepare multiple I-shaped samples, and at the same time, check the locking condition of the lower clamping mechanism 4;

[0046] 2. Clamp multiple samples into multiple pairs of clamps respectively. At the same time, adjust the fine adjustment bolt 17 to change the distance between the lower clamp 5 and the lower tension beam 8 so that the initial displacement of each sample is 0.

[0047] 3. Set the stretching length and time parameters, and initialize the force sensor 23;

[0048] 4. Synchronously control multiple geared motors 29 to drive multiple lead screws 31 to rotate, so that the upper tension beam 21 moves away from the lower tension beam 8. Through the cooperation of multiple upper clamps 6 and multiple lower clamps 5, multiple samples are subjected to tensile tests. At the same time, multiple force sensors 23 are used to collect real-time tensile force signals of multiple samples during the tensile process and send them to the controller. The controller obtains real-time tensile force data based on the real-time tensile force signals and records them.

[0049] 5. When the maximum stretching distance is reached, or the set stretching time is reached, or any real-time tensile data exceeds the set stretching threshold, the multiple reduction motors 29 are simultaneously controlled to stop and the sample is removed.

[0050] 6. Synchronously control multiple geared motors 29 to drive multiple lead screws 31 to rotate, so that the upper tension beam 21 moves towards the lower tension beam 8 until multiple upper clamps 6 are reset to the state of being close to multiple lower clamps 5, and synchronously control multiple geared motors 29 to stop.

[0051] 7. Export real-time tensile data from the controller; the test process ends. This allows for the comparison of material strength of different samples under the same tensile conditions by comparing tensile data under identical environmental parameters.

[0052] In this invention, the assembly base plate is tilted to provide an inclined plane for the tensile testing of the sample. During the tensile process, the sample is subjected to the combined effects of axial tensile force and gravitational components, creating a composite stress state that leads to non-uniform deformation. This allows for a better assessment of the sample's true performance under complex load conditions. Multiple lower clamps are arranged along the length of the upper end of the fixed lower clamping mechanism, while multiple upper clamps are arranged along the length of the lower end of the movable upper clamping mechanism. This facilitates the formation of multiple pairs of clamps, allowing for simultaneous tensile testing of multiple samples. The tensile process of multiple samples can be performed synchronously, ensuring that the environmental parameters of each sample are completely identical during the experiment. This results in more accurate tensile test data and facilitates comparison of the material strength of different samples under the same tensile conditions. Furthermore, this method of simultaneously testing multiple samples significantly improves testing efficiency and greatly shortens the test time when conducting batch tensile tests. The upper tensile beam is horizontally positioned on the assembly base plate, providing a stable support foundation for the multiple upper and lower clamping units. The upper and lower bearing housings serve as the supporting foundations for the lead screw at both ends, with the lead screw connected to the bearing housings via bearings. Simultaneously, a geared motor is connected to one end of the lead screw. This ensures a more stable and smooth rotation of the lead screw during motor-driven rotation. Two through holes are formed at both ends of the upper tension beam, and lead screw nuts are installed in these holes. Based on this, the rotational motion of the lead screw is converted into the linear displacement motion of the upper tension beam using the nuts and the upper tension beam, which slides against the surface of the mounting base. This allows for stable, efficient, and precise linear reciprocating movement of the upper tension beam, enabling automated tensile testing.

[0053] The device is compact, occupies little space, is simple to operate and easy to maintain. It can simultaneously conduct comparative tensile tests on multiple I-beam samples under identical environmental parameters, which can effectively reduce the adverse effects of different environmental parameters on the experimental results and help ensure the accuracy of tensile test data. At the same time, it can significantly improve the testing efficiency in batch sample tensile operations.

Claims

1. A multi-sample synchronous tensile testing device, comprising a tensile frame (1), characterized in that, It also includes an assembly substrate (2), a lower clamping mechanism (4), an upper clamping mechanism (3), and a driving mechanism (7); The assembly base plate (2) is fixedly mounted on the stretching frame (1) with the front higher than the back; The lower clamping mechanism (4) is horizontally fixedly installed on the rear part of the upper plate of the assembly base plate (2), and multiple lower clamps (5) are arranged at intervals along the length direction at its upper end. The upper clamping mechanism (3) is horizontally arranged above the lower clamping mechanism (4) and slides with the upper plate surface of the assembly substrate (2). The upper clamping mechanism (3) includes an upper tension beam (21). Two through holes are symmetrically opened at the left and right ends of the upper tension beam (21). Multiple upper clamps (6) are arranged sequentially along the length direction at the lower end of the upper tension beam (21). Multiple upper clamps (6) and multiple lower clamps (5) correspond one-to-one to form multiple pairs of clamps. The drive mechanism (7) is mounted on the assembly base plate (2) and includes two linear drive components. The two linear drive components are symmetrically distributed on the left and right sides of the upper surface of the assembly base plate (2) and are distributed corresponding to the two through holes. The linear drive components include an upper bearing seat (32), a lower bearing seat (33), a lead screw nut (30), a lead screw (31), a motor bracket (34), and a geared motor (29). The upper bearing seat (32) and the lower bearing seat (33) are distributed opposite each other above and below the through holes. They are respectively installed on the upper and lower parts of the upper plate of the assembly base plate (2); the lead screw nut (30) is fixedly installed in the through hole of the upper tension beam (21); the lead screw (31) is inserted into the lead screw nut (30) through threaded engagement, and its two ends are rotatably connected to the upper bearing seat (32) and the lower bearing seat (33) respectively through the upper bearing and the lower bearing; the geared motor (29) is installed on the assembly base plate (2) through the motor bracket (34), and its output shaft is connected to the lower end of the lead screw (31) through the coupling (35).

2. The multi-sample synchronous positional stretching test device according to claim 1, characterized in that, The lower clamping mechanism (4) includes a lower tension beam (8) and multiple lower clamping units (9); The lower tension beam (8) is fixedly connected to the assembly base plate (2) in the transverse direction. The upper end of the lower tension beam (8) is provided with a transversely extending strip mounting groove (10), and multiple external positioning holes communicating with the strip mounting groove (10) are opened sequentially and at intervals along its length. Multiple lower clamping units (9) are distributed one-to-one with multiple external positioning holes; the lower clamping unit (9) includes a connecting block (13), a clamping pin (14), an adjusting block (11), a lower clamp (5), a locking bolt (20), a limiting block (16), a long guide rod (15), and a fine-tuning bolt (17); The size of the connecting block (13) is adapted to the size of the strip mounting groove (10) and is inserted into the strip mounting groove (10). The middle part of the connecting block (13) has an inner positioning hole at the position corresponding to the outer positioning hole, and two lower threaded holes A are symmetrically opened on the upper end. The clamp pin (14) is inserted into both the outer positioning hole and the inner positioning hole to position and connect the connecting block (13) inside the lower tension beam (8); The adjusting block (11) has an adjusting groove (12) extending along the height direction inside. The upper and lower ends of the adjusting block (11) have an upper mounting hole and a lower mounting hole that communicate with the adjusting groove (12) respectively in the center area. The lower end of the adjusting block (11) has two guide holes that communicate with the adjusting groove (12) on the left and right sides of the lower mounting hole respectively. The two guide holes correspond to the two lower threaded holes A respectively. The lower clamp (5) is located in the upper center area of ​​the adjusting block (11). The lower clamp (5) includes a lower clamp (19) and a lower screw sleeve (18). The lower clamp (19) is a U-shaped frame with a notch in the upper center area. The lower screw sleeve (18) is fixedly connected to the lower center area of ​​the lower clamp (19). After passing through the upper mounting hole on the adjusting block (11), the locking bolt (20) is inserted into the lower threaded sleeve (18) through thread engagement, thereby fixing the lower clamp (5) to the upper end of the adjusting block (11); The limiting block (16) is slidably disposed in the adjusting groove (12). The central area of ​​the limiting block (16) is provided with an adjusting screw hole at the position corresponding to the lower mounting hole. Two upper threaded holes A are symmetrically provided on the left and right sides of the adjusting screw hole at its lower end. The two upper threaded holes A correspond to the two lower threaded holes A respectively. The upper end and lower end of the long guide rod (15) are respectively provided with an upper thread section A and a lower thread section A; the two long guide rods (15) are slidably inserted into the two guide holes, and the upper thread section A of the two long guide rods (15) is respectively inserted into the two upper thread holes A on the limiting block (16) through thread engagement, and the lower thread section A of the two long guide rods (15) is respectively inserted into the two lower thread holes A on the connecting block (13) through thread engagement; The fine-tuning bolt (17) passes through the lower mounting hole on the adjusting block (11) and is then threaded into the adjusting screw hole on the limiting block (16).

3. The multi-sample synchronous positional stretching test device according to claim 2, characterized in that, The upper clamping mechanism (3) also includes a plurality of upper clamping units (22); Multiple upper clamping units (22) are distributed in a one-to-one correspondence with multiple lower clamping units (9); the upper clamping unit (22) includes a force sensor (23), a connecting rod (24) and an upper clamp (6); The force sensor (23) is fixedly connected to the lower end of the upper tension beam (21), and a connecting rod thread hole is provided in the central area of ​​the force sensor (23); The upper and lower ends of the connecting rod (24) are respectively provided with an upper thread section B and a lower thread section B, and the upper thread section B is inserted into the threaded hole of the connecting rod through thread engagement. The upper clamp (6) includes an upper chuck (26) and an upper threaded sleeve (27). The upper chuck (26) is a U-shaped frame with a notch in the lower center area. The upper threaded sleeve (27) is fixedly connected to the upper center area of ​​the upper chuck (26) and is threadedly fitted onto the outside of the lower threaded section B of the connecting rod (24).

4. The multi-sample synchronous positional stretching test device according to claim 3, characterized in that, The stretching frame (1) includes long legs (36), short legs (37), crossbeams (38), longitudinal beams (39), and bases (40); two long legs (36) are arranged opposite each other on the left and right; two short legs (37) are arranged correspondingly on the rear side of the two long legs (36); two crossbeams (38) are arranged opposite each other in front and back, and the two ends of the front crossbeam (38) are fixedly connected to the bottom of the two long legs (36) respectively, and the rear crossbeam (39) is fixedly connected to the bottom of the two long legs (36). 8) The two ends are fixedly connected to the bottom of the two short legs (37) respectively; the two longitudinal beams (39) are distributed on the left and right sides, and the two ends of each longitudinal beam (39) are fixedly connected to the bottom of the long leg (36) and the short leg (37) on the same side respectively; the number of the feet (40) is four, of which two feet (40) are fixedly connected to the lower ends of the two long legs (36), and the other two feet (40) are fixedly connected to the lower ends of the two short legs (37).

5. The multi-sample synchronous positional stretching test device according to claim 4, characterized in that, It also includes an upper proximity switch, a lower proximity switch, an alarm module, and a controller; The upper proximity switch is installed below the upper bearing seat (32) in the left linear drive assembly, and the lower proximity switch is installed above the lower bearing seat (33) in the left linear drive assembly; the alarm module is installed on the tensioning frame (1); the controller is installed on the tensioning frame (1) and is connected to the force sensor (23), the upper proximity switch, the lower proximity switch, the geared motor (29) and the alarm module respectively.

6. The multi-sample synchronous positional stretching test device according to claim 5, characterized in that, The lower tension beam (8) is fixedly connected to the assembly base plate (2) by the shim block (25); the assembly base plate (2) is made of thick steel plate; the long support leg (36), short support leg (37), cross beam (38) and longitudinal beam (39) are all made of rectangular cold-formed hollow steel.

7. The multi-sample synchronous positional stretching test device according to claim 6, characterized in that, The lead screw (31) is a trapezoidal lead screw; the lead screw nut (30) is a trapezoidal nut; the motor in the geared motor (29) is a stepper motor.

8. The multi-sample synchronous positional stretching test device according to claim 7, characterized in that, The number of the upper clamping unit (22) and the plurality of lower clamping units (9) are both 10.

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