Mechanical property testing device for degradable biomaterials

Abstract

The utility model relates to biological material mechanics performance detection technical field especially for degradable biological material mechanics performance detection device, including testing machine, the base top of testing machine is provided with lower clamp, the lifting beam bottom of testing machine is provided with upper clamp, the upper clamp with lower clamp all include opposite setting fixed clamping plate and movable clamping plate and be used for driving movable clamping plate close or away from fixed clamping plate's telescopic cylinder, the fixed clamping plate fixed mounting on the upper clamp on lifting beam bottom the fixed clamping plate on the upper clamp is negative pressure adsorption board, and its adsorption surface is towards corresponding movable clamping plate, when clamping, the top of test piece is adsorbed through negative pressure adsorption board and then is clamped through upper clamp. The utility model in the process of carrying out tensile test, the stress of each position of test piece between upper clamp and lower clamp part is even, and the accuracy of detection result is improved.

Description

Technical Field

[0001] This utility model relates to the field of biomaterial mechanical property testing technology, specifically a device for testing the mechanical properties of biodegradable biomaterials. Background Technology

[0002] Biodegradable biomaterials are a class of polymeric materials that can undergo chemical, biological, or physical degradation in natural environments, especially under the action of microorganisms such as bacteria, fungi, and algae. During the degradation process, the chemical structure of these materials undergoes significant changes, their properties gradually deteriorate, and they are eventually completely or partially degraded by microorganisms into carbon dioxide and water.

[0003] Mechanical property testing of biodegradable biomaterials is a crucial step in assessing their ability to meet specific requirements in practical applications. Tensile testing, particularly tensile strength testing, is typically performed using a tensile strength testing machine. Specifically, the basic principle of a tensile strength testing machine is to apply a gradually increasing tensile load to the specimen until it fails, recording the strain and stress changes during this process. These data, after calculation and processing, can yield important parameters such as the material's tensile strength, yield point, and elongation at break.

[0004] However, current tensile strength testing machines cannot perform tensile tests on sheet-like biodegradable biomaterials because the clamps of these machines cannot clamp the sheet-like biodegradable biomaterials evenly. This results in different lengths of the sheet-like biodegradable biomaterials at different positions between the two clamps. For example, the length of the sheet-like biodegradable biomaterials on the left side between the two clamps may be greater than that on the right side, leading to different tensile forces at different positions when the sheet-like biodegradable biomaterials are subjected to tensile force. Summary of the Invention

[0005] The purpose of this invention is to provide a device for testing the mechanical properties of biodegradable biomaterials to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A device for testing the mechanical properties of biodegradable biomaterials includes a testing machine. The base of the testing machine is provided with a lower clamp, and the lifting beam of the testing machine is provided with an upper clamp. Both the upper clamp and the lower clamp include a fixed clamp plate and a movable clamp plate arranged opposite to each other, as well as a telescopic cylinder for moving the movable clamp plate closer to or away from the fixed clamp plate.

[0008] The fixing plate on the upper clamp is fixedly installed at the bottom of the lifting beam;

[0009] The fixing plate on the lower clamp is fixedly installed on the top of the base;

[0010] The fixed clamping plate on the upper clamp is a negative pressure adsorption plate, and its adsorption surface faces the corresponding movable clamping plate.

[0011] During clamping, the top of the test piece is adsorbed by the negative pressure adsorption plate and then clamped by the upper clamp.

[0012] Preferably, in the upper clamp, the free end of the telescopic cylinder passes through the top of the fixed clamping plate and is fixedly connected to the movable clamping plate;

[0013] In the lower clamp, the free end of the telescopic cylinder passes under the fixed clamping plate and is fixedly connected to the movable clamping plate.

[0014] Preferably, the negative pressure adsorption plate includes a shell and a porous plate. The shell has a negative pressure chamber on the side facing the movable clamp opposite it, and the porous plate is fixedly installed at the opening of the negative pressure chamber.

[0015] The negative pressure chamber is connected to a negative pressure device via a pipe.

[0016] Preferably, a plurality of stiffeners are fixed to one side of the perforated plate facing the negative pressure chamber, and the two ends of the stiffeners are respectively fixedly connected to two opposing sides of the inner wall of the negative pressure chamber, and the width of the stiffeners is less than the depth of the negative pressure chamber.

[0017] Preferably, both the upper clamp and the lower clamp further include a connecting plate; wherein the connecting plate on the upper clamp is fixedly connected between the lifting beam and the fixed clamping plate; and the connecting plate on the lower clamp is fixedly connected between the base and the fixed clamping plate.

[0018] Preferably, both the upper clamp and the lower clamp further include a mounting plate, the mounting plate being fixedly connected to the connecting plate, and the telescopic cylinder being mounted on the mounting plate.

[0019] Preferably, the free end of the telescopic cylinder is fixedly connected to the movable clamping plate by a reinforcing rib.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention involves flattening the top of the test specimen and adsorbing it onto a negative pressure adsorption plate, allowing the entire specimen to hang naturally. The bottom of the specimen is then placed between the fixed and movable clamps of the lower fixture. Finally, two telescopic cylinders clamp the top and bottom of the specimen. Because the top of the specimen is flattened and adsorbed onto the negative pressure adsorption plate while the bottom hangs naturally, the vertical length of the specimen at all positions between the upper and lower fixtures remains consistent after clamping. There is no inconsistency in length between the left and right sides of the specimen. Therefore, during the tensile test, the stress on all positions between the upper and lower fixtures is uniform, improving the accuracy of the test results. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a partial side view of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the fixing clamp of the upper clamp of this utility model;

[0025] Figure 4 This is a cross-sectional perspective view of the outer shell of this utility model.

[0026] In the picture:

[0027] 100. Testing machine; 101. Base; 102. Lifting beam;

[0028] 200. Test specimen;

[0029] 300. Upper clamp;

[0030] 400. Lower clamp;

[0031] 1. Fixed clamping plate; 11. Outer shell; 111. Negative pressure chamber; 12. Perforated plate; 13. Rib plate; 2. Movable clamping plate; 3. Connecting plate; 4. Mounting plate; 5. Telescopic cylinder; 6. Pipeline; 7. Reinforcing rib. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-4This utility model provides a technical solution:

[0034] A device for testing the mechanical properties of biodegradable biomaterials includes a testing machine 100. The base 101 of the testing machine 100 is equipped with a lower clamp 400 at the top, and the lifting beam 102 of the testing machine 100 is equipped with an upper clamp 300 at the bottom. In actual testing, the upper clamp 300 and the lower clamp 400 are used to clamp and fix the two ends of the test piece 200. Then, the testing machine 100 is started to test the tensile strength of the test piece 200. The above are all existing technologies and will not be elaborated here.

[0035] Unlike existing technologies, since the test piece 200 in this technical solution is a sheet-like biodegradable biomaterial, the structure of the upper clamp 300 and the lower clamp 400 has been modified to accommodate the sheet-like biodegradable biomaterial. Specifically, both the upper clamp 300 and the lower clamp 400 include a fixed clamping plate 1 and a movable clamping plate 2 arranged opposite to each other, as well as a telescopic cylinder 5 for moving the movable clamping plate 2 closer to or away from the fixed clamping plate 1. In this embodiment, the two sides of the fixed clamping plate 1 and the movable clamping plate 2 that are close to each other are both flat, so that the fixed clamping plate 1 and the movable clamping plate 2 can stably and firmly clamp the sheet-like biodegradable biomaterial. The specific structure of the telescopic cylinder 5 is not limited here. For example, the telescopic cylinder 5 can be a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0036] The free end of the telescopic cylinder 5 is fixedly connected to the movable clamping plate 2 through the reinforcing rib 7, so that the force generated by the telescopic cylinder 5 can be more evenly transmitted to the entire movable clamping plate 2.

[0037] The fixed clamping plate 1 on the upper clamp 300 is fixedly installed at the bottom of the lifting beam 102; the fixed clamping plate 1 on the lower clamp 400 is fixedly installed at the top of the base 101.

[0038] The fixed clamping plate 1 on the upper clamp 300 is a negative pressure adsorption plate, and its adsorption surface faces the corresponding movable clamping plate 2. During clamping, the top of the test piece 200 is adsorbed by the negative pressure adsorption plate and then clamped by the upper clamp 300.

[0039] The clamping principle of the above technical solution is as follows: First, both the upper clamp 300 and the lower clamp 400 are kept in the open state (that is, there is no contact between the fixed clamp 1 and the movable clamp 2). Then, the negative pressure adsorption plate generates adsorption force, and then the top of the test piece 200 (that is, the sheet-like biodegradable biomaterial) to be tested is flattened and adsorbed onto the negative pressure adsorption plate. After completion, the entire test piece 200 will be in a natural hanging state. Then, the bottom of the test piece 200 is placed between the fixed clamp 1 and the movable clamp 2 of the lower clamp 400. Finally, the two telescopic cylinders 5 are used to clamp the upper and lower parts of the test piece 200 respectively. The negative pressure adsorption plate can be closed by clamping the end. When the test piece 200 is clamped, the top of the test piece 200 is flattened and adsorbed onto the negative pressure adsorption plate, while the bottom of the test piece 200 hangs down naturally. Therefore, after the test piece 200 is clamped, the vertical length of each position of the test piece 200 located between the upper clamp 300 and the lower clamp 400 will be consistent. There is no situation where the lengths of the left and right sides of the test piece 200 are inconsistent. Therefore, during the tensile test, the force on each position of the test piece 200 located between the upper clamp 300 and the lower clamp 400 is uniform, which improves the accuracy of the test results.

[0040] Furthermore, the negative pressure adsorption plate includes a housing 11 and a perforated plate 12. Both the housing 11 and the perforated plate 12 can be made of stainless steel. The housing 11 has a negative pressure chamber 111 on the side facing the movable clamping plate 2 opposite to it. The perforated plate 12 is fixedly installed at the opening of the negative pressure chamber 111. The negative pressure chamber 111 is connected to the negative pressure device through the pipe 6. The negative pressure device is not specifically limited here. For example, the negative pressure device can be a vacuum pump.

[0041] Furthermore, a number of stiffeners 13 are fixed to one side of the perforated plate 12 facing the negative pressure chamber 111. The two ends of the stiffeners 13 are fixedly connected to the two opposite sides of the inner wall of the negative pressure chamber 111, and the width of the stiffeners 13 is less than the depth of the negative pressure chamber 111. The stiffeners 13 can enhance the structural strength of the perforated plate 12, so that it will not bend when clamping the test piece 200, and increase the clamping force on the test piece 200. On the other hand, the stiffeners 13 can also distribute the suction force in the negative pressure chamber 111 relatively evenly to each through hole position of the perforated plate 12.

[0042] Both the upper clamp 300 and the lower clamp 400 include a connecting plate 3 and a mounting plate 4; wherein, the connecting plate 3 on the upper clamp 300 is fixedly connected between the lifting beam 102 and the fixed clamp 1; the connecting plate 3 on the lower clamp 400 is fixedly connected between the base 101 and the fixed clamp 1; the mounting plate 4 is fixedly connected to the connecting plate 3, and the telescopic cylinder 5 is mounted on the mounting plate 4.

[0043] In the upper clamp 300, the free end of the telescopic cylinder 5 passes through the top of the fixed clamp 1 and is fixedly connected to the movable clamp 2; in the lower clamp 400, the free end of the telescopic cylinder 5 passes through the bottom of the fixed clamp 1 and is fixedly connected to the movable clamp 2. The purpose of this arrangement is that when the fixed clamp 1 and the movable clamp 2 are in the open state, the left and right ends of the gap between them are unobstructed, allowing workers to pull and flatten the top of the test piece 200 from both ends of the gap, thus facilitating operation.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the mechanical properties of biodegradable biomaterials, comprising a testing machine, wherein a lower clamp is provided on the top of the base of the testing machine, and an upper clamp is provided on the bottom of the lifting beam of the testing machine, characterized in that, Both the upper clamp and the lower clamp include a fixed clamping plate and a movable clamping plate arranged opposite to each other, as well as a telescopic cylinder for moving the movable clamping plate closer to or away from the fixed clamping plate; The fixing plate on the upper clamp is fixedly installed at the bottom of the lifting beam; The fixing plate on the lower clamp is fixedly installed on the top of the base; The fixed clamping plate on the upper clamp is a negative pressure adsorption plate, and its adsorption surface faces the corresponding movable clamping plate. During clamping, the top of the test piece is adsorbed by the negative pressure adsorption plate and then clamped by the upper clamp.

2. The biodegradable biomaterial mechanical property testing device according to claim 1, characterized in that, In the upper clamp, the free end of the telescopic cylinder passes through the top of the fixed clamping plate and is fixedly connected to the movable clamping plate; In the lower clamp, the free end of the telescopic cylinder passes under the fixed clamping plate and is fixedly connected to the movable clamping plate.

3. The biodegradable biomaterial mechanical property testing device according to claim 1, characterized in that, The negative pressure adsorption plate includes a shell and a porous plate. The shell has a negative pressure chamber on the side facing the movable clamp opposite it, and the porous plate is fixedly installed at the opening of the negative pressure chamber. The negative pressure chamber is connected to a negative pressure device via a pipe.

4. The biodegradable biomaterial mechanical property testing device according to claim 3, characterized in that, A number of stiffeners are fixed to one side of the perforated plate facing the negative pressure chamber. The two ends of the stiffeners are fixedly connected to two opposite sides of the inner wall of the negative pressure chamber, and the width of the stiffeners is less than the depth of the negative pressure chamber.

5. The biodegradable biomaterial mechanical property testing device according to claim 1, characterized in that, Both the upper clamp and the lower clamp further include a connecting plate; wherein, the connecting plate on the upper clamp is fixedly connected between the lifting beam and the fixed clamping plate; and the connecting plate on the lower clamp is fixedly connected between the base and the fixed clamping plate.

6. The biodegradable biomaterial mechanical property testing device according to claim 5, characterized in that, Both the upper clamp and the lower clamp further include a mounting plate, which is fixedly connected to the connecting plate, and the telescopic cylinder is mounted on the mounting plate.

7. The biodegradable biomaterial mechanical property testing device according to claim 1, characterized in that, The free end of the telescopic cylinder is fixedly connected to the movable clamping plate by reinforcing ribs.

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