A hydrogel tensile mechanical properties testing device and method

Abstract

The invention relates to the technical field of hydrogel tensile performance testing, and discloses a hydrogel tensile mechanical performance testing device and method, wherein a lifting limit frame is provided at the rear of the upper end of a base, and a stretching lifting seat is slidably connected inside the lifting limit frame; a top clamping assembly for clamping the upper part of the hydrogel is installed at the front of the stretching lifting seat, and a bottom clamping assembly located directly below the top clamping assembly is provided at the middle of the upper end of the base; the invention can realize rapid clamping and releasing of the hydrogel through the arrangement of the top clamping assembly and the bottom clamping assembly, which is beneficial to improving the efficiency of the hydrogel tensile mechanical performance testing; and the clamping is synchronously and horizontally contacted from both sides of the hydrogel, so as to ensure that the contact area between the clamping point and the hydrogel is large, and the hydrogel can be clamped without being cracked; when the hydrogel is stretched, the hydrogel will not be tilted, thereby ensuring the accuracy of the tensile test result of the hydrogel.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogel tensile performance testing, in particular to a hydrogel tensile mechanical performance testing device and method. Background Art

[0002] The tensile performance test of hydrogel is one of the important indicators to measure its mechanical properties. The tensile performance test aims to evaluate the mechanical behavior of hydrogel under tensile load, including key parameters such as tensile strength, tensile fracture stress, tensile yield stress and tensile elastic modulus. These parameters are of great significance for understanding the mechanical properties of hydrogel, optimizing its performance and expanding its application areas. At present, the methods for measuring the tensile properties of hydrogel mainly include the tensile method, that is, after the hydrogel sample is clamped and fixed with upper and lower clamps, a static tensile load is applied to the hydrogel sample along the longitudinal axis (i.e., the up and down direction) until the sample is broken. During this process, the stress-strain curve of the sample is recorded and analyzed. The clamping and releasing operations of the ordinary upper and lower clamps for hydrogel samples are cumbersome, especially when multiple groups of hydrogel samples need to be measured to meet the measurement accuracy, which reduces the test efficiency. In addition, the clamping of the upper and lower ends of the hydrogel sample may cause the hydrogel sample to tilt, so that accurate measurement results cannot be obtained when the hydrogel sample is stretched. When the hydrogel sample is clamped with a clamp with a jaw, the jaw needs to rotate during the clamping process. When the jaw contacts the hydrogel sample, the contact area between the two is small, and the contact point cannot achieve horizontal contact, which easily causes the hydrogel sample to be damaged during clamping. For this reason, we introduce a hydrogel tensile mechanical property testing device and method. Summary of the invention

[0003] The purpose of the present invention is to provide a hydrogel tensile mechanical properties testing device and method to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A hydrogel tensile mechanical property testing device, comprising a base, a lifting limit frame is provided at the rear of the upper end of the base, and a tensile lifting seat is slidably connected inside the lifting limit frame;

[0006] A top clamping assembly for clamping the upper part of the hydrogel is installed at the front of the stretching lifting seat, and a bottom clamping assembly located directly below the top clamping assembly is provided at the middle of the upper end of the base;

[0007] After the top clamping assembly is synchronously clamped from both sides of the upper part of the hydrogel, the bottom of the hydrogel is located directly above and inside the bottom clamping assembly, and after the locking member on the bottom clamping assembly is locked, the locking member drives the clamping claw assemblies symmetrical on both sides of the top of the bottom clamping assembly to synchronously clamp the two sides of the bottom of the hydrogel, so that the hydrogel is in a vertical state, and the clamping claw assemblies always maintain horizontal contact with both sides of the bottom of the hydrogel;

[0008] After the stretching lifting seat is driven by the driving assembly to move upward along the lifting limit frame, the top clamping assembly and the bottom clamping assembly stretch the hydrogel. At the same time, the tension detection module on the bottom clamping assembly detects the tension of the hydrogel.

[0009] Preferably, the stretching lifting seat comprises a lifting plate slidably connected to the sliding cavity inside the lifting limit frame, side wheels movably connected to the lifting plate through side ear plates on both sides, a rear wheel movably connected to the middle of the rear end of the lifting plate through the rear limit plate, a front wheel movably connected to the front ear plate in the middle of the front end of the lifting plate through a rotating shaft, and a mounting plate fixed to the front end of the front ear plate;

[0010] Vertical slide grooves are arranged on both sides of the sliding cavity, the side ear plates are slidably connected to the vertical slide grooves, and the side wheels are closely attached to the side walls of the vertical slide grooves;

[0011] A vertical slot is provided in the middle of the rear end of the lifting limit frame, the rear limit plate extends through the vertical slot, and the rear wheel is closely attached to the rear end surface of the lifting limit frame;

[0012] The front wheel is in close contact with the front end surface of the lifting limit frame.

[0013] Preferably, the driving assembly comprises a first servo motor installed inside the base and a driving screw connected to the output end of the first servo motor;

[0014] The top of the driving screw rod passes through the middle of the lifting plate and is movably connected to the top wall of the sliding cavity.

[0015] Preferably, the top clamping assembly includes a second servo motor fixed to the middle of the upper end of the mounting plate, an intermediate gear connected to the rear of the mounting plate after the output end of the second servo motor passes through the mounting plate, side gears symmetrically connected to the front and rear ends of the lower end of the mounting plate, and a clamping plate assembly slidably connected to the front and rear ends of the bottom of the mounting plate;

[0016] The two sets of side gears are respectively meshed with the front and rear sides of the intermediate gear;

[0017] The second servo motor drives the clamping plate assembly to synchronously clamp the two sides of the upper part of the hydrogel through the intermediate gear and the side gear.

[0018] Preferably, the clamping plate assembly includes a T-shaped sliding seat slidably connected to the T-shaped sliding grooves arranged at the front and rear of the bottom of the mounting plate, a rack fixed inside the T-shaped sliding seat, a clamping plate fixed to the inner wall of the convex plate in the middle of the lower end of the T-shaped sliding seat, and a rubber plate fixed to the side of the clamping plate;

[0019] The side edge of the clamping plate is also connected to the convex plate through a diagonal brace reinforcement plate;

[0020] The rack is meshed with the outer side of the corresponding side gear, and the outer diameter of the intermediate gear is smaller than the outer diameter of the side gear.

[0021] Preferably, the bottom clamping assembly comprises a bottom plate provided at the middle of the upper end of the base and a top seat connected to the top of the bottom plate through a tension detection module and a locking member;

[0022] The clamping jaw assembly comprises rotating clamping jaws movably connected on both sides of the top seat and a clamping seat symmetrically slidably connected inside the top seat. The inner wall of the clamping seat is provided with a rubber clamping block and the arc-shaped top block on the top of the rotating clamping jaw is tightly attached to the corresponding outer wall of the clamping seat.

[0023] Preferably, the tension detection module includes a long rod fixed at the middle of the lower end of the top seat, a first disc fixed at the bottom of the long rod, a connecting tube penetrating the top of the long rod, a round table fixed in the middle of the top of the bottom plate, a connecting column screwed and fixed at the middle of the upper end of the round table, a second disc fixed at the top of the connecting column, a bottom cover plate sleeved on the outside of the connecting column, and pressure sensors fixed on both sides of the upper end of the bottom cover plate;

[0024] The first disc and the second disc are both extended into the connecting cylinder, the bottom cover is fixed to the bottom of the connecting cylinder, and a first spring is connected between the upper end of the second disc and the lower end of the first disc;

[0025] The locking member comprises a locking nut threadedly connected to the lower part of the long rod, a jacking cylinder fixed at the upper end of the locking nut and sleeved on the outside of the long rod, and a jacking block sleeved on the upper part of the long rod;

[0026] The locking nut is located above the connecting tube, the lifting block is located on the top of the tightening tube, and the two sides of the top of the lifting block are against the inner side of the lower part of the rotating clamping claw.

[0027] Preferably, vertical protrusions are symmetrically arranged on both sides of the upper portion of the long rod, and the vertical protrusions are slidably connected to the inside of the lifting block.

[0028] Preferably, a cylinder is fixed to the inner wall of the upper part of the rotating clamping jaw through a connecting plate, and the cylinder is movably connected to the inner grooves on both sides of the top seat by a pin;

[0029] A slider is provided in the middle of the lower end of the clamp seat, and the slider is slidably connected to the limiting groove in the top of the top seat. The light rod arranged on the upper part of the limiting groove extends through the reserved hole on the slider, and a second spring is also provided between the lower parts of the two groups of sliders, and the two ends of the second spring are fixed in the mounting grooves on the inner wall of the lower part of the slider.

[0030] The present invention also provides a method for testing a hydrogel tensile mechanical property testing device, which specifically comprises the following steps:

[0031] S1, extending the upper part of the hydrogel into the top clamping assembly, and the top clamping assembly performs synchronous clamping from both sides of the upper part of the hydrogel;

[0032] S2, after the bottom of the hydrogel is directly above the bottom clamping assembly, the locking piece is locked, and the two symmetrical assembly jaw assemblies are driven to synchronously clamp the two sides of the bottom of the hydrogel, and the clamping jaw assemblies are in horizontal contact with the two sides of the bottom of the hydrogel, so that the hydrogel is in a vertical state;

[0033] S3, the driving component drives the stretching lifting seat to move upward along the lifting limit frame, and then the top clamping component and the bottom clamping component stretch the hydrogel. At the same time, the tension detection module on the bottom clamping component detects the tension of the hydrogel until the hydrogel breaks.

[0034] Compared with the prior art, the present invention has the following beneficial effects: the present invention can realize rapid clamping and releasing of the hydrogel by setting the top clamping assembly and the bottom clamping assembly, which is beneficial to improving the efficiency of the test of the tensile mechanical properties of the hydrogel; and the hydrogel is clamped synchronously and horizontally from both sides of the hydrogel, so as to ensure that the contact area between the clamping point and the hydrogel is large, and the hydrogel can be clamped without being cracked; after the top clamping assembly and the bottom clamping assembly clamp the hydrogel and fix it, when the hydrogel is stretched, the hydrogel always maintains the stretching in a vertical state, and does not cause the hydrogel to tilt, thereby ensuring the accuracy of the tensile test results of the hydrogel, and during the tensile test, the tension of the hydrogel can be detected by the pressure sensor on the bottom clamping assembly, and the detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention when no hydrogel is clamped;

[0036] Figure 2 It is a three-dimensional structural schematic diagram of the bottom clamping assembly of the present invention;

[0037] Figure 3 For the present invention Figure 2 A schematic cross-sectional structure diagram of ;

[0038] Figure 4 It is a schematic diagram of the top seat structure of the present invention;

[0039] Figure 5 It is a schematic diagram of the three-dimensional structure of the connection between the locking nut, the jacking cylinder, the jacking block, the long rod and the top seat of the present invention;

[0040] Figure 6 It is a schematic diagram of the three-dimensional structure of the connection between the clamp seat, the rubber clamp block and the slider of the present invention;

[0041] Figure 7 It is a schematic diagram of the three-dimensional structure of the installation of the second servo motor and the stretching lifting seat of the present invention;

[0042] Figure 8 For the present invention Figure 7 Schematic diagram of the three-dimensional structure from another perspective;

[0043] Fig. 9 It is a schematic diagram of a first three-dimensional structure of the splint assembly of the present invention;

[0044] Fig.10 It is a second three-dimensional structural schematic diagram of the splint assembly of the present invention;

[0045] Fig.11 It is a schematic diagram of the three-dimensional structure of the top clamping assembly and the stretching lifting seat assembled in the present invention;

[0046] Fig.12 This is a schematic diagram of the overall three-dimensional structure of the hydrogel after clamping and fixing;

[0047] Fig.13 For the present invention Figure 1 A schematic diagram of a second three-dimensional structure;

[0048] Fig.14 For the present invention Figure 1 Schematic diagram of the third three-dimensional structure.

[0049] In the figure: 1, base; 2, bottom clamping assembly; 201, bottom plate; 202, round table; 203, connecting column; 204, bottom cover plate; 205, connecting cylinder; 206, locking nut; 207, tightening cylinder; 208, lifting block; 209, rotating clamp; 210, long rod; 211, top seat; 212, clamp seat; 213, pressure sensor; 214, second disc; 215, first spring; 216, first disc; 217, vertical protrusion; 218, rubber clamp block; 219, arc-shaped top block; 220, connecting plate; 221, pin shaft; 222, inner groove; 223, cylinder; 224, light rod; 225, second spring; 226, slider; 227, limit groove; 228. Mounting slot; 229. Reserved hole; 3. Lifting limit frame; 301. Sliding cavity; 302. Vertical slot; 303. Vertical slide groove; 4. Driving screw; 5. Top clamping assembly; 501. Second servo motor; 502. Side gear; 503. Intermediate gear; 504. T-shaped sliding seat; 505. Rack; 506. Clamp; 507. Diagonal brace reinforcement plate; 508. Rubber plate; 509. Convex plate; 6. Stretch lifting seat; 601. Lifting plate; 602. Rear limit plate; 603. Rear wheel; 604. Side ear plate; 605. Side wheel; 606. Front wheel; 607. Front ear plate; 608. Mounting plate; 609. T-shaped slide groove; 610. Rotating shaft; 7. Hydrogel. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] See also Figure 1-14 , the present invention provides a technical solution:

[0052] A hydrogel tensile mechanical property testing device comprises a base 1, a lifting limit frame 3 is provided at the rear of the upper end of the base 1, and a tensile lifting seat 6 is slidably connected inside the lifting limit frame 3;

[0053] The stretching lifting seat 6 includes a lifting plate 601 that is slidably connected to the sliding cavity 301 inside the lifting limit frame 3, side wheels 605 that are movably connected to the lifting plate 601 through side ear plates 604 on both sides, a rear wheel 603 that is movably connected to the middle of the rear end of the lifting plate 601 through a rear limit plate 602, a front wheel 606 that is movably connected to the front ear plate 607 in the middle of the front end of the lifting plate 601 through a rotating shaft 610, and a mounting plate 608 fixed at the front end of the front ear plate 607.

[0054] Vertical slide grooves 303 are provided on both sides of the sliding cavity 301, and the side ear plates 604 are slidably connected to the vertical slide grooves 303, and the side wheels 605 are close to the side walls of the vertical slide grooves 303. This arrangement makes the lifting plate 601 smoother and more stable when moving up and down without tilting.

[0055] A vertical slot 302 is provided in the middle of the rear end of the lifting limit frame 3, and the rear limit plate 602 extends through the vertical slot 302, and the rear wheel 603 is close to the rear end surface of the lifting limit frame 3, and the front wheel 606 is close to the front end surface of the lifting limit frame 3. This arrangement makes the lifting plate 601 smoother and more stable when moving up and down, and will not tilt.

[0056] As described above, by setting the stretching lifting seat 6, when the stretching lifting seat 6 moves up and down, the top clamping assembly 5 thereon can also be driven to move up and down smoothly, so that when the hydrogel 7 is stretched, the hydrogel 7 always maintains a vertical stretching state, and will not cause the hydrogel 7 to tilt, thereby ensuring the accuracy of the stretching test results of the hydrogel 7.

[0057] A top clamping assembly 5 for clamping the upper part of the hydrogel 7 is installed at the front of the stretching lifting seat 6;

[0058] The top clamping assembly 5 includes a second servo motor 501 fixed to the middle of the upper end of the mounting plate 608, an intermediate gear 503 connected to the mounting plate 608 after the output end of the second servo motor 501 passes through the mounting plate 608, a side gear 502 symmetrically connected to the lower end of the mounting plate 608, and a clamping plate assembly slidingly connected to the bottom of the mounting plate 608;

[0059] The two sets of side gears 502 are respectively meshed with the front and rear sides of the middle gear 503;

[0060] The second servo motor 501 drives the clamping plate assembly to synchronously clamp the upper two sides of the hydrogel 7 through the intermediate gear 503 and the side gear 502 .

[0061] The model of the second servo motor 501 is HF-SN152J-S100, HF-KP053BK, HF-KP43, HG-MR053B or other servo motor models that meet the use requirements. The second servo motor 501 is controlled by PLC.

[0062] The second servo motor 501 drives the middle gear 503 to rotate, so that the middle gear 503 drives the side gear 502 to rotate synchronously.

[0063] The clamping plate assembly includes a T-shaped sliding seat 504 slidingly connected to the T-shaped sliding groove 609 arranged at the front and rear of the bottom of the mounting plate 608, a rack 505 fixed inside the T-shaped sliding seat 504, a clamping plate 506 fixed to the inner wall of the convex plate 509 at the middle of the lower end of the T-shaped sliding seat 504, and a rubber plate 508 fixed to the side of the clamping plate 506;

[0064] The arrangement of the rubber plate 508 allows the rubber plate 508 to have a large contact area with the hydrogel 7 and to be in horizontal contact when clamping the upper portion of the hydrogel 7, so that the upper portion of the hydrogel 7 can be clamped without being cracked.

[0065] The side of the splint 506 is also connected to the convex plate 509 through the diagonal brace reinforcing plate 507. The arrangement of the diagonal brace reinforcing plate 507 increases the structural strength of the splint 506 when the splint 506 clamps the upper part of the hydrogel 7.

[0066] The outer diameter of the middle gear 503 is smaller than the outer diameter of the side gear 502 . Such a configuration enables the middle gear 503 to easily drive the side gear 502 to rotate.

[0067] The rack 505 is meshed with the outer side of the corresponding side gear 502 , and the side gear 502 drives the T-shaped sliding seat 504 to move through the rack 505 , so that the front and rear clamping plates 506 can clamp the upper part of the hydrogel 7 when they are close to each other.

[0068] A bottom clamping assembly 2 is provided at the middle of the upper end of the base 1 and is located directly below the top clamping assembly 5;

[0069] The bottom clamping assembly 2 includes a bottom plate 201 provided at the middle of the upper end of the base 1 and a top seat 211 connected to the top of the bottom plate 201 through a tension detection module and a locking member;

[0070] The clamping jaw assembly includes rotating clamping jaws 209 movably connected on both sides of the top seat 211 and a clamping seat 212 symmetrically slidably connected inside the top seat 211. The inner wall of the clamping seat 212 is provided with a rubber clamping block 218 and the arc-shaped top block 219 on the top of the rotating clamping jaw 209 is tightly attached to the corresponding outer wall of the clamping seat 212.

[0071] The tension detection module includes a long rod 210 fixed at the middle of the lower end of the top seat 211, a first disc 216 fixed at the bottom of the long rod 210, a connecting tube 205 passing through the top of the long rod 210, a round table 202 fixed in the middle of the top of the bottom plate 201, a connecting column 203 screwed and fixed at the middle of the upper end of the round table 202, a second disc 214 fixed at the top of the connecting column 203, a bottom cover plate 204 sleeved on the outside of the connecting column 203, and pressure sensors 213 fixed on both sides of the upper end of the bottom cover plate 204;

[0072] The first disc 216 and the second disc 214 are both extended into the connecting tube 205 , the bottom cover plate 204 is fixed to the bottom of the connecting tube 205 , and a first spring 215 is connected between the upper end of the second disc 214 and the lower end of the first disc 216 .

[0073] The first spring 215 is arranged so that the first disc 216 and the second disc 214 are located at the upper and lower ends of the connecting tube 205 respectively. When the top clamping assembly 5 moves upward to stretch the hydrogel 7, the long rod 210 and the connecting tube 205 can be directly driven upward by the hydrogel 7 until the second disc 214 presses down on the pressure sensor 213 on the bottom cover plate 204, and then the tensile force on the hydrogel 7 is detected by the pressure on the pressure sensor 213.

[0074] The model of the pressure sensor 213 is NS-TH18 or other servo motor models that meet the use requirements, and the pressure sensor 213 is electrically connected to the PLC.

[0075] The locking member includes a locking nut 206 threadedly connected to the lower part of the long rod 210, a jacking cylinder 207 fixed at the upper end of the locking nut 206 and sleeved on the outer side of the long rod 210, and a lifting block 208 sleeved on the upper part of the long rod 210;

[0076] The locking nut 206 is located above the connecting tube 205 , the lifting block 208 is located on the top of the tightening tube 207 , and the top sides of the lifting block 208 abut against the lower inner side of the rotating clamp 209 .

[0077] When the locking nut 206 is manually rotated so that the locking nut 206 moves upward relative to the long rod 210, the tightening cylinder 207 pushes the lifting block 208 upward, so that the two sides of the top of the lifting block 208 push the lower part of the rotating clamp 209. At this time, the top of the rotating clamp 209 rotates and closes with the pin shaft 221 as the center of the circle, and the arc-shaped lifting block 219 on the top of the rotating clamp 209 pushes the clamp seat 212 to move inwardly of the limiting groove 227 until the left and right groups of clamp seats 212 are close to each other, and the lower part of the hydrogel 7 is clamped between the left and right groups of rubber clamp blocks 218.

[0078] By rotating the top of the clamping jaw 209 with the pin shaft 221 as the center of the circle, the left and right clamping seats 212 are driven to move horizontally closer along the limit groove 227. When the lower part of the hydrogel 7 is clamped between the left and right rubber clamping blocks 218, the rubber clamping blocks 218 of the clamping jaw assembly always keep horizontal contact with both sides of the bottom of the hydrogel 7, and the contact area with the hydrogel 7 is large, so that the lower part of the hydrogel 7 can be clamped without being cracked.

[0079] At the same time, it can also ensure that the hydrogel 7 is clamped in a vertical state, so that when the top clamping component 5 moves up to stretch the hydrogel 7, the hydrogel 7 can be prevented from tilting, and the tension applied to the hydrogel 7 can be prevented from tilting, thereby ensuring the accuracy of the tensile test results of the hydrogel 7.

[0080] Vertical protrusions 217 are symmetrically arranged on both sides of the upper part of the long rod 210, and the vertical protrusions 217 are slidably connected to the inside of the lifting block 208. This arrangement ensures that the position of the lifting block 208 will not shift when the lifting block 208 moves up and down relative to the long rod 210, and ensures that the two ends of the top of the lifting block 208 always rest against the lower inner side of the rotating clamp 209.

[0081] A cylinder 223 is fixed to the inner wall of the upper part of the rotating clamp 209 through a connecting plate 220, and the cylinder 223 is movably connected to the inner grooves 222 on both sides of the top seat 211 by a pin shaft 221;

[0082] A slider 226 is provided in the middle of the lower end of the clamp seat 212, and the slider 226 is slidably connected to the limiting groove 227 in the top of the top seat 211. The light rod 224 arranged on the upper part of the limiting groove 227 extends through the reserved hole 229 on the slider 226. This arrangement makes the slider 226 slide in the limiting groove 227 more smoothly and stably.

[0083] A second spring 225 is also provided between the lower parts of the two groups of sliders 226, and both ends of the second spring 225 are fixed in the mounting groove 228 of the inner wall of the lower part of the slider 226. Through the arrangement of the second spring 225, when the locking member moves down along the long rod 210 so that the top of the rotating clamping jaw 209 rotates and opens with the pin shaft 221 as the center, the two groups of sliders 226 can simultaneously move to the two ends of the limiting groove 227 to reset, so as to re-clamp a new hydrogel 7 later.

[0084] In this way, by locking (moving the locking nut 206 upward) and loosening (moving the locking nut 206 downward) the locking nut 206 can be used to quickly clamp and release the lower part of the hydrogel 7.

[0085] The driving assembly includes a first servo motor installed inside the base 1 and a driving screw 4 connected to the output end of the first servo motor. The top of the driving screw 4 passes through the middle of the lifting plate 601 and is movably connected to the top wall of the sliding cavity 301. A bearing is embedded in the top wall of the sliding cavity 301, and the bearing is sleeved on the top of the driving screw 4.

[0086] The model of the first servo motor can be selected as HF-SN152J-S100, HF-KP053BK, HF-KP43, HG-MR053B or other servo motor models that meet the use requirements. The first servo motor adopts PLC to control the operation, which are conventional technical means in the field.

[0087] After the top clamping assembly 5 is synchronously clamped from both sides of the upper part of the hydrogel 7, the bottom of the hydrogel 7 is located directly above the bottom clamping assembly 2, and after the locking member on the bottom clamping assembly 2 is locked, the locking member drives the clamping claw assemblies symmetrical on both sides of the top of the bottom clamping assembly 2 to synchronously clamp the two sides of the bottom of the hydrogel 7, so that the hydrogel 7 is in a vertical state, and the clamping claw assemblies are always in horizontal contact with the two sides of the bottom of the hydrogel 7;

[0088] After the stretching lifting seat 6 is driven by the driving assembly to move upward along the lifting limit frame 3, the top clamping assembly 5 and the bottom clamping assembly 2 stretch the hydrogel 7. At the same time, the tension detection module on the bottom clamping assembly 2 detects the tension of the hydrogel 7.

[0089] The present invention also provides a method for testing a hydrogel tensile mechanical property testing device, which specifically comprises the following steps:

[0090] S1, extending the upper part of the hydrogel 7 into the top clamping assembly 5, and the top clamping assembly 5 performs synchronous clamping from both sides of the upper part of the hydrogel 7;

[0091] S2, after the bottom of the hydrogel 7 is located directly above the bottom clamping assembly 2, the locking member is locked, and the two symmetrical assembly clamping jaw assemblies are driven to synchronously clamp the two sides of the bottom of the hydrogel 7, and the clamping jaw assemblies are in horizontal contact with the two sides of the bottom of the hydrogel 7, so that the hydrogel 7 is in a vertical state;

[0092] S3, the driving component drives the stretching lifting seat 6 to move upward along the lifting limit frame 3, and then the top clamping component 5 and the bottom clamping component 2 form a stretching for the hydrogel 7. At the same time, the tension detection module on the bottom clamping component 2 realizes the detection of the tension of the hydrogel 7 until the hydrogel 7 breaks.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydrogel tensile mechanical properties testing device, comprising a base, characterized in that: A lifting limit frame is provided at the rear of the upper end of the base, and a stretching lifting seat is slidably connected inside the lifting limit frame; A top clamping assembly for clamping the upper part of the hydrogel is installed at the front of the stretching lifting seat, and a bottom clamping assembly located directly below the top clamping assembly is provided at the middle of the upper end of the base; After the top clamping assembly is synchronously clamped from both sides of the upper part of the hydrogel, the bottom of the hydrogel is located directly above and inside the bottom clamping assembly, and after the locking member on the bottom clamping assembly is locked, the locking member drives the clamping claw assemblies symmetrical on both sides of the top of the bottom clamping assembly to synchronously clamp the two sides of the bottom of the hydrogel, so that the hydrogel is in a vertical state, and the clamping claw assemblies always maintain horizontal contact with both sides of the bottom of the hydrogel; After the stretching lifting seat is driven by the driving assembly to move upward along the lifting limit frame, the top clamping assembly and the bottom clamping assembly stretch the hydrogel, and at the same time, the tension detection module on the bottom clamping assembly detects the tension of the hydrogel; The bottom clamping assembly includes a bottom plate provided at the middle of the upper end of the base and a top seat connected to the top of the bottom plate through a tension detection module and a locking member; The clamping jaw assembly comprises rotating clamping jaws movably connected on both sides of the top seat and a clamping seat symmetrically slidably connected inside the top seat, wherein the inner wall of the clamping seat is provided with a rubber clamping block and the arc-shaped top block on the top of the rotating clamping jaw is closely attached to the corresponding outer wall of the clamping seat; The tension detection module includes a long rod fixed at the middle of the lower end of the top seat, a first disc fixed at the bottom of the long rod, a connecting tube penetrating the top of the long rod, a round table fixed in the middle of the top of the bottom plate, a connecting column screwed and fixed at the middle of the upper end of the round table, a second disc fixed at the top of the connecting column, a bottom cover plate sleeved on the outside of the connecting column, and pressure sensors fixed on both sides of the upper end of the bottom cover plate; The first disc and the second disc are both extended into the connecting cylinder, the bottom cover is fixed to the bottom of the connecting cylinder, and a first spring is connected between the upper end of the second disc and the lower end of the first disc; The locking member comprises a locking nut threadedly connected to the lower part of the long rod, a jacking cylinder fixed at the upper end of the locking nut and sleeved on the outside of the long rod, and a jacking block sleeved on the upper part of the long rod; The locking nut is located above the connecting tube, the lifting block is located on the top of the tightening tube, and the two sides of the top of the lifting block are against the inner side of the lower part of the rotating clamping claw.

2. A hydrogel tensile mechanical properties testing device according to claim 1, characterized in that: The stretching lifting seat comprises a lifting plate slidably connected to the sliding cavity inside the lifting limit frame, side wheels movably connected to the lifting plate through side ear plates on both sides, a rear wheel movably connected to the middle of the rear end of the lifting plate through the rear limit plate, a front wheel movably connected to the front ear plate in the middle of the front end of the lifting plate through a rotating shaft, and a mounting plate fixed to the front end of the front ear plate; Vertical slide grooves are arranged on both sides of the sliding cavity, the side ear plates are slidably connected to the vertical slide grooves, and the side wheels are closely attached to the side walls of the vertical slide grooves; A vertical slot is provided in the middle of the rear end of the lifting limit frame, the rear limit plate extends through the vertical slot, and the rear wheel is closely attached to the rear end surface of the lifting limit frame; The front wheel is in close contact with the front end surface of the lifting limit frame.

3. A hydrogel tensile mechanical properties testing device according to claim 2, characterized in that: The driving assembly includes a first servo motor installed inside the base and a driving screw connected to the output end of the first servo motor; The top of the driving screw rod passes through the middle of the lifting plate and is movably connected to the top wall of the sliding cavity.

4. The hydrogel tensile mechanical properties testing device according to claim 2, characterized in that: The top clamping assembly includes a second servo motor fixed to the middle of the upper end of the mounting plate, an intermediate gear connected to the rear of the mounting plate after the output end of the second servo motor passes through the mounting plate, side gears symmetrically connected to the front and rear ends of the lower end of the mounting plate, and a clamping plate assembly slidingly connected to the front and rear ends of the bottom of the mounting plate; The two sets of side gears are respectively meshed with the front and rear sides of the intermediate gear; The second servo motor drives the clamping plate assembly to synchronously clamp the two sides of the upper part of the hydrogel through the intermediate gear and the side gear.

5. A hydrogel tensile mechanical properties testing device according to claim 4, characterized in that: The clamping plate assembly includes a T-shaped sliding seat slidably connected to the T-shaped sliding grooves arranged at the front and rear of the bottom of the mounting plate, a rack fixed inside the T-shaped sliding seat, a clamping plate fixed to the inner wall of the convex plate in the middle of the lower end of the T-shaped sliding seat, and a rubber plate fixed to the side of the clamping plate; The side edge of the clamping plate is also connected to the convex plate through a diagonal brace reinforcement plate; The rack is meshed with the outer side of the corresponding side gear, and the outer diameter of the intermediate gear is smaller than the outer diameter of the side gear.

6. The hydrogel tensile mechanical properties testing device according to claim 1, characterized in that: Vertical protrusions are symmetrically arranged on both sides of the upper part of the long rod, and the vertical protrusions are slidably connected to the inside of the lifting block.

7. The hydrogel tensile mechanical properties testing device according to claim 1, characterized in that: A cylinder is fixed to the inner wall of the upper part of the rotating clamp through a connecting plate, and the cylinder is movably connected to the inner grooves on both sides of the top seat by a pin shaft; A slider is provided in the middle of the lower end of the clamp seat, and the slider is slidably connected to the limiting groove in the top of the top seat. The light rod arranged on the upper part of the limiting groove extends through the reserved hole on the slider, and a second spring is also provided between the lower parts of the two groups of sliders, and the two ends of the second spring are fixed in the mounting grooves on the inner wall of the lower part of the slider.

8. A testing method based on the hydrogel tensile mechanical properties testing device according to any one of claims 1 to 7, characterized in that: The specific steps include: S1, extending the upper part of the hydrogel into the top clamping assembly, and the top clamping assembly performs synchronous clamping from both sides of the upper part of the hydrogel; S2, after the bottom of the hydrogel is directly above the bottom clamping assembly, the locking piece is locked, and the two symmetrical assembly jaw assemblies are driven to synchronously clamp the two sides of the bottom of the hydrogel, and the clamping jaw assemblies are in horizontal contact with the two sides of the bottom of the hydrogel, so that the hydrogel is in a vertical state; S3, the driving component drives the stretching lifting seat to move upward along the lifting limit frame, and then the top clamping component and the bottom clamping component stretch the hydrogel. At the same time, the tension detection module on the bottom clamping component detects the tension of the hydrogel until the hydrogel breaks.

Images