Hydrogel viscosity testing device

Abstract

The utility model discloses a hydrogel viscosity testing device which comprises a viscosity testing assembly, the viscosity testing assembly is composed of a lifting moving unit and a horizontal moving unit, and the lifting moving unit and the horizontal moving unit are both arranged on a testing frame body. The normal viscosity, the tangential viscosity and the tearing viscosity of the hydrogel are tested through different movements, data are transmitted to the computer through the multi-directional force sensor, viscosity change curves at different stages are drawn on the computer according to the data of the multi-directional force sensor, and the viscosity change curves are calculated according to the viscosity change curves. According to the hydrogel viscosity detection device, different types of viscosities of hydrogel can be accurately detected, and the surface state of the hydrogel can be monitored while the working condition of the hydrogel is simulated by arranging the camera, so that the practical application capability of the hydrogel is comprehensively evaluated, and the problems that the hydrogel is various in variety and poor in stability are solved. Some hydrogels have the problems of surface damage, partial hydrogel shedding on the surface and the like caused by insufficient crosslinking.

Description

Technical Field

[0001] The utility model relates to a testing device, in particular to a hydrogel viscosity testing device, belonging to the technical field of biomaterial hydrogel performance testing. Background Art

[0002] Hydrogel is a kind of extremely hydrophilic three-dimensional network structure gel, which swells rapidly in water and can hold a large volume of water without dissolving in this swollen state. Test methods for the mechanical properties of hydrogels include tensile testing, compression testing, shear testing, etc. Among them, tensile testing is the main method for evaluating the tensile properties of hydrogels, and compression testing is mainly used to evaluate the compressive properties of hydrogels. With the development of most medical hydrogels and flexible hydrogel sensors, viscosity has also become an important indicator for detecting hydrogels. The existing hydrogel viscosity detection methods and devices are insufficient. The adhesion performance detection method involved in the present invention can accurately reflect the adhesion performance of hydrogels, greatly shortening the time for integrating data and replacing experimental equipment. The present invention uses a flexible sensor connected to a computer to realize multi-directional tearing test, and draws a performance curve based on the test results, and can simultaneously observe the appearance changes of the hydrogel at each stage. Different flexible fixtures and platforms can be replaced to realize multi-substrate performance detection, which is of great significance to the biomedical application of hydrogel flexible sensors and hydrogels.

[0003] The existing hydrogel viscosity test usually evaluates the viscosity of the hydrogel by sticking the hydrogel on the plane to be tested and observing the length of time it takes to fall. This method is obviously not standard enough. Testing the hydrogel with a tensile testing machine has problems such as being unable to detect the tear viscosity and being unable to fix the hydrogel on the stretching machine. Hydrogel is a type of extremely hydrophilic three-dimensional network structure gel. If the clamping force is too large, the hydrogel will break, making the mechanical property test inaccurate. If the clamping force is too small, the hydrogel will fall off due to the stretching, shrinkage and deformation. The existing technology does not have a specific mechanism and method for testing the adhesion properties of hydrogel materials. The commonly used hydrogel testing methods cannot accurately and digitally test the compression properties, normal adhesion, tangential adhesion, and tear adhesion properties of the hydrogel. Utility Model Content

[0004] The purpose of the utility model is to provide a hydrogel viscosity testing device in order to solve at least one of the above technical problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions: a hydrogel viscosity testing device, comprising a viscosity testing assembly, the viscosity testing assembly is composed of a lifting and moving unit and a horizontal moving unit, and the lifting and moving unit and the horizontal moving unit are both arranged on a test frame;

[0006] The test frame includes a back plate and a base. There are two back plates in a vertical shape, and the back plate located at the rear side is fixedly connected to the base. The lifting and moving unit includes a lifting and adjusting motor and a lifting and adjusting screw. The lifting and adjusting motor and the lifting and adjusting screw are both connected to the back plate at the rear side, and the lifting and adjusting screw is connected to a multi-directional force sensor and a hydrogel to be tested. The multi-directional force sensor is connected to an external computer for signal transmission. The horizontal moving unit includes a horizontal adjustment motor and a horizontal adjustment screw. The horizontal adjustment motor and the horizontal adjustment screw are both connected to the base, and the horizontal adjustment screw is connected to a viscosity test platform.

[0007] As a further solution of the utility model: a limiting sleeve is arranged between the two back plates, and the limiting sleeve is respectively located at the four corners of the back plates, and the four corners of the two back plates are also connected with fastening bolts, and the limiting sleeve is sleeved on the fastening bolts.

[0008] As a further solution of the utility model: a vertical limiting sliding groove is provided on the back plate at the front side.

[0009] As a further solution of the utility model: the lifting and adjusting screw includes a lifting and adjusting screw shaft and a lifting and adjusting screw nut, the lifting and adjusting screw nut is threadedly sleeved on the shaft body of the lifting and adjusting screw shaft, the upper end of the lifting and adjusting screw shaft is coaxially connected with the rotating shaft of the lifting and adjusting motor, the lifting and adjusting screw nut is fixedly connected with a lifting connection platform by bolts, the lifting and adjusting screw nut is fixedly connected with a multi-directional force sensor by bolts, the bottom of the sensing end of the multi-directional force sensor is fixedly connected with a flexible clamp by bolts, and the flexible clamp clamps the hydrogel to be tested.

[0010] As a further solution of the utility model: the flexible clamp can be replaced by a flat plate of different materials.

[0011] As a further solution of the utility model: the horizontal adjustment screw includes a horizontal adjustment screw shaft and a horizontal adjustment screw nut, the horizontal adjustment screw nut is threadedly sleeved on the shaft body of the horizontal adjustment screw shaft, and one end of the horizontal adjustment screw shaft is coaxially connected to the rotating shaft of the horizontal adjustment motor.

[0012] As a further solution of the utility model: the viscosity test platform can be replaced with platforms of different materials.

[0013] As a further solution of the utility model: an L-shaped connecting rod is also connected to the lifting connection platform, and a camera is fixedly connected to the bottom end of the L-shaped connecting rod, and the lens of the camera is aimed at the bottom of the multi-directional force sensor.

[0014] The beneficial effects of the utility model are as follows: through different movements, the normal viscosity, tangential viscosity and tear viscosity of the hydrogel can be tested, the data can be transmitted to the computer through the multi-directional force sensor, and the viscosity change curves in different stages can be drawn on the computer according to the data of the multi-directional force sensor, so as to realize accurate detection of different types of viscosity of the hydrogel. In addition, the present application is provided with a camera, which can monitor the surface state of the hydrogel while simulating the hydrogel working condition, so as to comprehensively evaluate the practical application ability of the hydrogel, so as to solve the problems of a wide variety of hydrogels, surface damage caused by insufficient cross-linking of some hydrogels, and partial shedding of the surface hydrogel, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front view structure of the utility model;

[0017] Figure 3 This is a side view of the structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure between the camera and the multi-directional force sensor of the utility model.

[0019] In the figure: 1. back plate, 2. base, 3. limit slide groove, 4. limit sleeve, 5. fastening bolts, 6. lifting adjustment motor, 7. lifting adjustment screw shaft, 8. L-shaped connecting rod, 9. camera, 10. multi-directional force sensor, 11. flexible clamp, 12. horizontal adjustment motor, 13. horizontal adjustment screw shaft, 14. viscosity test platform, 15. horizontal adjustment screw nut, 16. lifting connection platform, 17. lifting adjustment screw nut. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1, as Figures 1 to 4 As shown, a hydrogel viscosity testing device includes a viscosity testing assembly, the viscosity testing assembly is composed of a lifting and moving unit and a horizontal moving unit, and the lifting and moving unit and the horizontal moving unit are both arranged on a testing frame;

[0022] The test frame includes a back plate 1 and a base 2. Two back plates 1 are vertically arranged, and the back plate 1 located on the rear side is fixedly connected to the base 2. The lifting and moving unit includes a lifting and adjusting motor 6 and a lifting and adjusting screw. The lifting and adjusting motor 6 and the lifting and adjusting screw are both connected to the back plate 1 located on the rear side, and the lifting and adjusting screw is connected to a multi-directional force sensor 10 and a hydrogel to be tested. The multi-directional force sensor 10 is connected to an external computer for signal transmission. The horizontal moving unit includes a horizontal adjustment motor 12 and a horizontal adjustment screw. The horizontal adjustment motor 12 and the horizontal adjustment screw are both connected to the base 2, and the horizontal adjustment screw is connected to a viscosity test platform 14.

[0023] Embodiment 2. In addition to all the technical features of embodiment 1, this embodiment also includes: a limiting sleeve 4 is arranged between the two back panels 1, and the limiting sleeve 4 is respectively located at the four corners of the back panels 1, and the four corners of the two back panels 1 are also connected with fastening bolts 5, the limiting sleeve 4 is sleeved on the fastening bolts 5, and the back panel 1 located on the front side can be fixed by the fastening bolts 5, and a certain distance is left between the two back panels 1 under the action of the limiting sleeve 4, so that the lifting and moving unit can be arranged between the two back panels 1.

[0024] A vertical limiting slot 3 is provided on the back plate 1 at the front side, so that the hydrogel to be tested connected to the lifting and adjusting screw can be located on the outside of the front back plate 1, and the lifting and adjusting screw can drive the hydrogel to be tested to be lifted and moved along the limiting slot 3.

[0025] Embodiment three, in addition to all the technical features of embodiment one, this embodiment also includes: the lifting and adjusting screw includes a lifting and adjusting screw shaft 7 and a lifting and adjusting screw nut 17, the lifting and adjusting screw nut 17 is threadedly sleeved on the shaft body of the lifting and adjusting screw shaft 7, the upper end of the lifting and adjusting screw shaft 7 is coaxially connected to the rotating shaft of the lifting and adjusting motor 6, the lifting and adjusting screw nut 17 is fixedly connected with a lifting connection platform 16 by bolts, the lifting and adjusting connection platform 16 is fixedly connected with a multi-directional force sensor 10 by bolts, the bottom of the sensing end of the multi-directional force sensor 10 is fixedly connected with a flexible clamp 11 by bolts, and the flexible clamp 11 clamps the hydrogel to be tested, and can drive the lifting and adjusting screw shaft 7 to rotate by the rotation of the lifting and adjusting motor 6, so as to realize the lifting and adjusting of the lifting and adjusting screw nut 17.

[0026] The flexible fixture 11 can be replaced with a flat plate made of different materials to test the tangential viscosity of different substrates.

[0027] The horizontal adjustment screw includes a horizontal adjustment screw shaft 13 and a horizontal adjustment screw nut 15. The horizontal adjustment screw nut 15 is threadedly sleeved on the shaft of the horizontal adjustment screw shaft 13. One end of the horizontal adjustment screw shaft 13 is coaxially connected with the rotating shaft of the horizontal adjustment motor 12. The horizontal adjustment motor 12 can rotate to drive the horizontal adjustment screw shaft 13 to rotate, so that the horizontal adjustment screw nut 15 can drive the viscosity test platform 14 to move left and right, and then cooperate with the movement of the lifting adjustment screw to place the hydrogel to be tested on the viscosity test platform 14. The lifting adjustment motor 6 rotates to drive the lifting adjustment screw nut 17 to move upward, so that the hydrogel block clamped by the flexible clamp 11 begins to be stretched, and the multi-directional force sensor 10 transmits data to the computer until the hydrogel is completely separated from the viscosity test platform 14. At this time, the computer can draw a normal interface toughness-displacement curve based on the data, so as to analyze the normal viscosity of the hydrogel; the flexible clamp 11 is replaced with a flat The hydrogel to be tested is placed on the viscosity test platform 14, the lifting and adjusting motor 6 rotates to drive the upper flat plate to fit the hydrogel, the lifting and adjusting motor 6 stops working, the horizontal adjustment motor 12 moves to drive the horizontal adjustment screw nut 15 to move to one side until the hydrogel is completely separated from the upper platform, the multi-directional force sensor 10 is subjected to 0 force, and the computer draws a tangential interface toughness-displacement curve, thereby analyzing the tangential adhesion of the hydrogel; the flexible clamp 11 is used to clamp the hydrogel block to be tested, the lifting and adjusting motor 6 rotates to drive the hydrogel block to fit the viscosity test platform 14, and the multi-directional force sensor 10 is observed to ensure that the force is 0, so that the hydrogel is bonded to the viscosity test platform 14 but without pressure and tension. At this time, the lifting and adjusting motor 6 and the horizontal adjustment motor 12 move at the same time, so that the hydrogel is subjected to an oblique tearing force. When the hydrogel is completely separated from the viscosity test platform 14, the test ends, and the tearing interface toughness-displacement curve is obtained, thereby analyzing the tearing viscosity of the hydrogel.

[0028] The viscosity testing platform 14 can be replaced with platforms of different materials to test the normal viscosity of different substrates.

[0029] An L-shaped connecting rod 8 is also connected to the lifting connecting platform 16, and a camera 9 is fixedly connected to the bottom end of the L-shaped connecting rod 8. The lens of the camera 9 is aimed at the bottom of the multi-directional force sensor 10. During each test, the camera 9 above the multi-directional force sensor 10 can shoot the entire experimental process to observe the changes in the hydrogel when subjected to normal pulling, tangential pulling, and oblique tearing, and combine with the viscosity curve to comprehensively derive the adhesive performance of the hydrogel.

[0030] The hydrogel to be tested is placed on the viscosity test platform 14, and the lifting and adjusting motor 6 is rotated to drive the lifting and adjusting screw nut 17 to move upward, so that the hydrogel block clamped by the flexible clamp 11 begins to be stretched, and the multi-directional force sensor 10 transmits data to the computer until the hydrogel is completely separated from the viscosity test platform 14. At this time, the computer can draw a normal interface toughness-displacement curve based on the data, so as to analyze the normal viscosity of the hydrogel; the flexible clamp 11 is replaced with a flat plate, and the hydrogel to be tested is placed on the viscosity test platform 14. The lifting and adjusting motor 6 rotates to drive the upper flat plate to fit the hydrogel, and the lifting and adjusting motor 6 stops working. The horizontal adjustment motor 12 moves to drive the horizontal adjustment screw nut 15 to move to one side. The multi-directional force sensor 10 is moved until the hydrogel is completely separated from the upper platform, and the force on the multi-directional force sensor 10 is 0. The computer draws a tangential interface toughness-displacement curve, thereby analyzing the tangential adhesion of the hydrogel; the flexible clamp 11 is used to clamp the hydrogel block to be tested, and the lifting and adjusting motor 6 rotates to drive the hydrogel block to fit with the viscosity test platform 14, and the multi-directional force sensor 10 is observed to ensure that the force is 0, so that the hydrogel and the viscosity test platform 14 are bonded but without pressure and tension. At this time, the lifting and adjusting motor 6 and the horizontal adjustment motor 12 move at the same time, so that the hydrogel is subjected to an oblique lateral tearing force. When the hydrogel is completely separated from the viscosity test platform 14, the test is ended, and the tear interface toughness-displacement curve is obtained, thereby analyzing the tear viscosity of the hydrogel.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hydrogel viscosity testing device, comprising a viscosity testing assembly, characterized in that: The viscosity test assembly is composed of a lifting and moving unit and a horizontal moving unit, and the lifting and moving unit and the horizontal moving unit are both arranged on the test frame; The test frame comprises a back plate (1) and a base (2), wherein two back plates (1) are arranged vertically, and the back plate (1) located at the rear side is fixedly connected to the base (2), the lifting and moving unit comprises a lifting and moving adjustment motor (6) and a lifting and moving adjustment screw, wherein the lifting and moving adjustment motor (6) and the lifting and moving adjustment screw are both connected to the back plate (1) located at the rear side, and the lifting and moving adjustment screw is connected to a multi-directional force sensor (10) and a hydrogel to be tested, and the multi-directional force sensor (10) is connected to an external computer for signal transmission, and the horizontal moving unit comprises a horizontal adjustment motor (12) and a horizontal adjustment screw, wherein the horizontal adjustment motor (12) and the horizontal adjustment screw are both connected to the base (2), and the horizontal adjustment screw is connected to a viscosity test platform (14).

2. The hydrogel viscosity testing device according to claim 1, characterized in that: A limiting sleeve (4) is provided between the two back plates (1), and the limiting sleeve (4) is respectively located at the four corners of the back plates (1), and the four corners of the two back plates (1) are also connected with fastening bolts (5), and the limiting sleeve (4) is sleeved on the fastening bolts (5).

3. The hydrogel viscosity testing device according to claim 2, characterized in that: A vertical limiting sliding groove (3) is provided on the back plate (1) located on the front side.

4. The hydrogel viscosity testing device according to claim 1, characterized in that: The lifting and adjusting screw comprises a lifting and adjusting screw shaft (7) and a lifting and adjusting screw nut (17); the lifting and adjusting screw nut (17) is threadedly sleeved on the shaft body of the lifting and adjusting screw shaft (7); the upper end of the lifting and adjusting screw shaft (7) is coaxially connected to the rotating shaft of the lifting and adjusting motor (6); a lifting connection platform (16) is fixedly connected to the lifting and adjusting screw nut (17) by bolts; a multi-directional force sensor (10) is fixedly connected to the lifting and adjusting screw platform (16) by bolts; a flexible clamp (11) is fixedly connected to the bottom of the sensing end of the multi-directional force sensor (10) by bolts, and the flexible clamp (11) clamps the hydrogel to be tested.

5. The hydrogel viscosity testing device according to claim 4, characterized in that: The flexible fixture (11) can be replaced with a flat plate made of different materials to test the tangential viscosity of different substrates.

6. The hydrogel viscosity testing device according to claim 1, characterized in that: The horizontal adjustment screw comprises a horizontal adjustment screw shaft (13) and a horizontal adjustment screw nut (15); the horizontal adjustment screw nut (15) is threadedly sleeved on the shaft of the horizontal adjustment screw shaft (13); one end of the horizontal adjustment screw shaft (13) is coaxially connected to the rotating shaft of the horizontal adjustment motor (12).

7. The hydrogel viscosity testing device according to claim 1, characterized in that: The viscosity testing platform (14) can be replaced with platforms made of different materials.

8. The hydrogel viscosity testing device according to claim 4, characterized in that: The lifting connection platform (16) is also connected to an L-shaped connecting rod (8), the bottom end of the L-shaped connecting rod (8) is fixedly connected to a camera (9), and the lens of the camera (9) is aimed at the bottom of the multi-directional force sensor (10).

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