Tensile creep testing device for dental diaphragm

Abstract

The utility model discloses a dental diaphragm tensile creep test device, which comprises a support assembly, a tensile force application assembly, a displacement measurement assembly, a sample fixing assembly and an environment simulation assembly, the tensile force application assembly is connected with the sample fixing assembly, and the tensile force application assembly and the sample fixing assembly are installed on the support assembly; the tensile force application assembly is used for applying a constant tensile force to a to-be-tested sample in the same testing process; the sample fixing assembly is fixedly connected with two ends of a sample to be tested, and comprises a fixed end and a movable end connected with the tensile force application assembly; the displacement measurement assembly is used for measuring the displacement of the to-be-tested sample in the stretching direction when the stretching force application assembly applies the tensile force; the environment simulation assembly comprises a containing box used for containing a liquid medium and a temperature control module used for controlling the temperature of the liquid medium, and during testing, a sample to be tested is completely immersed in the liquid medium in the containing box.

Description

Technical Field

[0001] This utility model belongs to the field of dental orthodontics technology, and more specifically relates to the field of experimental testing equipment for dental membranes, and particularly to a tensile creep testing device for dental membranes. Background Technology

[0002] In the field of orthodontic technology, invisible aligners based on polymer materials are becoming increasingly popular due to their aesthetic appeal, convenience, and ease of cleaning. Invisible aligners are typically a single, integrated shell that forms a cavity to accommodate multiple teeth, with the geometry of the cavity closely matching the arrangement of these teeth. Currently, the manufacturing of invisible aligners is primarily achieved through a thermoforming process. The performance of the dental membrane, the raw material for manufacturing invisible aligners, directly impacts their quality. Among the many properties of the dental membrane, its tensile creep properties directly determine the lifespan of the aligner and the force exerted.

[0003] Creep in dental diaphragms refers to the phenomenon where strain increases while stress remains constant. The key to tensile creep testing is maintaining a constant tensile force. Current technologies primarily rely on adding weights to achieve a stable tensile force, albeit in different ways. Some methods involve directly suspending the diaphragm with a weight; for example, applying a 10kg force requires a 10kg weight, and vice versa. This results in high cost, large size of the weights, excessive height of the entire device, and inconvenient movement. Furthermore, to prevent the sample from breaking and impacting the bottom, cushioning and protective measures are necessary, which is quite dangerous. However, since dental diaphragms are used to fabricate invisible orthodontic appliances worn inside the patient's mouth, current tensile creep testing is only conducted in the laboratory under conditions where the tensile force remains constant. There is no research on the tensile creep performance of dental diaphragms when worn in the oral cavity with saliva, drinking water, or other liquids. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the defects of the existing technology and provide a tensile creep testing device for dental films that can simulate the liquid environment in the oral cavity, which improves the accuracy of the test. Moreover, the device has a compact and simple structure, which greatly reduces the size of the device and improves the measurement safety factor.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A tensile creep testing device for dental membranes includes a support assembly, a tensile force application assembly, a displacement measurement assembly, a sample fixation assembly, and an environmental simulation assembly. The tensile force application assembly is connected to the sample fixation assembly, and both are mounted on the support assembly. The tensile force application assembly applies a constant tensile force to a test sample during the same test. The sample fixation assembly is fixedly connected to both ends of the test sample, including a fixed end and a movable end connected to the tensile force application assembly. The fixed end restricts the movement of one end of the test sample in the tensile direction, and the movable end pulls the other end of the test sample to achieve creep in the tensile direction. The displacement measurement assembly measures the displacement of the test sample in the tensile direction when the tensile force application assembly applies a tensile force.

[0007] The environmental simulation component includes a container for holding a liquid medium and a temperature control module for controlling the temperature of the liquid medium. During testing, the test sample is completely immersed in the liquid medium within the container. The length of the container along the stretching direction satisfies the following condition: the test sample is completely immersed in the liquid medium throughout the testing process. The liquid medium is saliva used to simulate the human mouth or a beverage ingested by a person. The temperature control module controls the temperature of the liquid medium to be maintained within a predetermined temperature range during the same testing process.

[0008] Preferably, the temperature control module includes a temperature controller, a temperature sensor, and a heating device, which are respectively communicatively connected to the temperature controller. The temperature controller obtains temperature information within the temperature control device through the temperature sensor. When the temperature information is lower than a predetermined temperature value, the temperature controller controls the heating device to adjust the heating so that the temperature within the temperature control device meets the predetermined temperature value.

[0009] Preferably, the temperature control module uses water for heat transfer, and the temperature control module further includes a temperature control box that can house the container box. The temperature control box is also provided with a support platform for supporting the container box, and the heating device is located below the support platform.

[0010] Preferably, the support assembly includes a support base, a support shaft, two vertical supports disposed on the support base, and a horizontal support connecting the two vertical supports, with the two ends of the support shaft respectively disposed on the two horizontal supports.

[0011] Preferably, the tensioning force application component includes a torque balance arm and a counterweight. The torque balance arm is installed perpendicular to the axial direction of the support shaft. The first end of the torque balance arm is fixedly connected to the support shaft. The second end of the torque balance arm away from the support shaft is equipped with a counterweight of variable weight.

[0012] Preferably, the torque balancing arm includes an arc segment and a connecting arm arranged radially along the arc segment; one end of the connecting arm is connected to the arc segment, and the other end is provided with a connecting plate, the connecting plate being rotatably connected to the support shaft on the support assembly, and the radial direction of the arc segment is perpendicular to the axial direction of the support shaft; the counterweight is suspended on the arc segment; wherein, the arc segment, the connecting plate, and the support shaft are coaxially arranged.

[0013] Preferably, it further includes a counterweight for counteracting the torque generated by the weight of the torque balance arm on the support shaft; wherein the counterweight is fixedly mounted on the first end of the torque balance arm via a connecting rod and is positioned away from the second end.

[0014] Preferably, the tensioning force application component includes a fixed pulley and a counterweight, with both ends of the support shaft fixedly mounted on the two transverse supports, and the fixed pulley rotatably connected to the support shaft; one end of the fixed pulley is equipped with a counterweight of variable weight.

[0015] Preferably, the sample fixing assembly includes a first clamping member disposed at the movable end and a second clamping member disposed at the fixed end, respectively used to fix both ends of the sample to be tested; wherein, one end of the first clamping member is connected to one end of the tensile force application assembly, and the other end clamps one side of the sample to be tested; one end of the second clamping member clamps the other side of the sample to be tested, and the other end is fixed to the support assembly.

[0016] Preferably, the displacement measurement component includes a laser displacement sensor and a laser positioning block; the laser positioning block is connected to the movable end of the sample fixing component and its displacement changes with the displacement of the sample under test; the laser displacement sensor is disposed on the support component, and the laser beam of the laser displacement sensor is directed toward the laser positioning block, for recording the displacement change of the sample under test during the stretching process; or,

[0017] The displacement measurement component includes an imaging device, which is positioned facing the test sample. At least two marking lines are provided on the test sample, and the distance between adjacent marking lines constitutes a gauge length. The imaging device is used to record the change of the gauge length during the stretching process of the test sample, so as to record the displacement change during the stretching process of the test sample.

[0018] Compared with the prior art, the present invention, by adopting the above technical solution, has at least one of the following beneficial effects:

[0019] (1) The dental membrane tensile creep testing device provided by this utility model applies a constant tensile force to the test sample during the same test process through the tensile force application component. The tensile force application component is connected to the sample fixing component. Furthermore, the environmental simulation component simulates the liquid environment and temperature conditions in the patient's oral cavity. It can test and obtain the creep performance parameters of the dental membrane in the simulated oral environment, which is beneficial to improve the accuracy of the test. It can accurately predict the usage time and orthodontic effect of the invisible orthodontic appliance made of the dental membrane in the human oral cavity, so as to adjust the patient's orthodontic plan in a timely manner and ensure the patient's treatment effect.

[0020] (2) In the dental membrane tensile creep testing device provided by this utility model, the counterweight can achieve stable tension on the test sample through the torque balance arm and the sample fixing assembly. The lever principle is used to increase the tensile force applied to the test sample by the counterweight, so that the large tensile force test on the test sample can be achieved without the need for a large volume and heavy counterweight. The counterweight is small in weight and volume, and the cost is low. Because the counterweight is small in weight, the impact caused by the test sample breaking due to accidental factors under large tensile force is small, which improves the safety factor of the test. In addition, because the counterweight is small in mass and volume, it is not necessary to increase the overall volume of the testing device of this application to accommodate a large mass counterweight, further reducing the volume of the testing device and reducing the cost.

[0021] (3) In the dental membrane tensile creep testing device provided by this utility model, the displacement measurement component can be measured by the cooperation of a laser displacement sensor and a laser positioning block; by using the laser displacement sensor to record the displacement change of the test sample during the stretching process, very high measurement accuracy can be achieved. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same numerical reference numerals are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0023] Figure 1 This is a three-dimensional structural diagram of the dental membrane tensile creep testing device in Embodiment 1 of this utility model;

[0024] Figure 2 This is a front structural schematic diagram of the dental membrane tensile creep testing device in Embodiment 1 of this utility model;

[0025] Figure 3This is a schematic diagram of the torque balance arm in Embodiment 1 of this utility model;

[0026] Figure 4 This is a front view of the tensile creep testing device for dental membranes in Embodiment 2 of this utility model.

[0027] Figure 5 This is another front view of the dental membrane tensile creep testing device in Embodiment 2 of this utility model. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model.

[0029] The directional terms "up," "down," "left," and "right" used in this article refer to the directions shown in the accompanying drawings and do not imply any special limitations.

[0030] As the background technology shows, the thermoforming process is currently the main method for manufacturing invisible orthodontic appliances. The performance of the dental membrane, the raw material for manufacturing these appliances, directly affects their quality. Among the many properties of the dental membrane, the tensile creep performance test is crucial, directly determining the appliance's lifespan and the expression of corrective force. However, current creep performance testing of dental membranes still faces certain problems. For example, the testing device is large and too tall, and there is a risk of damage from a broken test sample impacting the ground. Furthermore, current testing devices cannot accurately measure the creep performance of dental membranes within the patient's oral environment.

[0031] Based on this, the applicant proposes a tensile creep testing device for dental membranes, comprising a support assembly, a tensile force application assembly, a displacement measurement assembly, a sample fixing assembly, and an environmental simulation assembly. The tensile force application assembly is connected to the sample fixing assembly, and the tensile force application assembly and the sample fixing assembly are mounted on the support assembly. The tensile force application assembly applies a constant tensile force to a test sample during the same test. The sample fixing assembly is fixedly connected to both ends of the test sample, including a fixed end and a movable end connected to the tensile force application assembly. The fixed end restricts the movement of one end of the test sample in the tensile direction, and the movable end pulls the other end of the test sample to achieve the desired result. The test sample exhibits creep in the tensile direction; the displacement measurement component measures the displacement of the test sample in the tensile direction when the tensile force application component applies tension; and the environmental simulation component includes a container for holding a liquid medium and a temperature control module for controlling the temperature of the liquid medium. During testing, the test sample is completely immersed in the liquid medium within the container. The length of the container along the tensile direction satisfies the following condition: the test sample is completely immersed in the liquid medium throughout the testing process; the liquid medium is saliva used to simulate the human oral cavity or a beverage ingested by the human body; the temperature control module controls the temperature of the liquid medium to be maintained within a predetermined temperature range during the same testing process.

[0032] The following will provide a detailed explanation in conjunction with the accompanying drawings.

[0033] Example 1

[0034] Please refer to Figure 1 and Figure 2As shown. This application provides a tensile creep testing device 100 for dental membranes, including a support assembly 1, a tensile force application assembly, a displacement measurement assembly, a sample fixing assembly, and an environmental simulation assembly. The tensile force application assembly is connected to the sample fixing assembly, and the tensile force application assembly and the sample fixing assembly are mounted on the support assembly 1. The tensile force application assembly applies a constant tensile force to a test sample 6 during the same test. The sample fixing assembly is fixedly connected to both ends of the test sample 6, including a fixed end 41 with one end fixed, and a movable end 42 connected to the tensile force application assembly. The fixed end 41 restricts the movement of one end of the test sample 6 in the tensile direction, i.e., fixes one end of the test sample 6 stationary; while the movable end 42 is used for pulling... The other end of the test sample 6 is designed to allow creep to occur as the test sample 6 moves in the tensile direction; the displacement measuring component is used to measure the displacement of the test sample 6 in the tensile direction when the tensile force applying component applies a tensile force; and the environmental simulation component includes a container 51 and a temperature control module, wherein the container 51 is used to contain a liquid medium to simulate the liquid environment of the test sample 6 in the oral cavity; the temperature control module is used to control the temperature of the liquid medium to make the temperature of the liquid medium conform to the temperature conditions in the patient's oral cavity, and during the same test, the temperature control module controls the temperature of the liquid medium to be maintained within a predetermined temperature range, for example, 37°C-55°C, to simulate the temperature conditions of the test sample 6 in the patient's oral cavity. During the test, the test sample 6 is completely immersed in the liquid medium within the container 51. Furthermore, the test sample 6 needs to be fully immersed in the liquid medium throughout the test. This is achieved in this application by setting the dimensions of the container 51, particularly the length of the container 51 along the stretching direction. For example, the length of the container 51 along the stretching direction is designed to be greater than or equal to the length of the test sample 6 after it is fully stretched. In this application, the test sample 6 is a raw material used to manufacture invisible orthodontic appliances, namely a dental membrane. After the invisible orthodontic appliance is manufactured, its application scenario is in the patient's oral cavity. Its liquid environment varies depending on the liquid in the patient's mouth. Only the creep performance parameters tested after simulating the liquid environment in the patient's oral cavity can be used to evaluate the creep performance of the dental membrane under the application scenario, thereby accurately evaluating the life cycle and orthodontic force expression of the invisible orthodontic appliance product. Further, the liquid medium can be saliva used to simulate the human oral cavity, or it can be a beverage ingested by the human body, such as mineral water, tea, milk, cola, etc.

[0035] The dental membrane tensile creep testing device 100 provided in this application can simulate the liquid environment and temperature conditions in the patient's oral cavity through an environmental simulation component. Under this test environment, the creep performance parameters of the dental membrane in the simulated human oral cavity environment can be tested and obtained, which is beneficial to improve the accuracy of the test and to accurately predict the usage time and orthodontic effect of the invisible orthodontic appliance. This allows for timely adjustment of the patient's orthodontic plan, thereby ensuring the patient's treatment effect.

[0036] Further explanation: The temperature control module includes a temperature controller, a temperature sensor, and a heating device 53, all communicatively connected to the temperature controller. The temperature controller acquires temperature information within the temperature control device via the temperature sensor. When the temperature information is lower than a predetermined temperature value, the temperature controller controls the heating device 53 to adjust its heating so that the temperature within the temperature control device meets the predetermined temperature value. Specifically, in one embodiment, the predetermined temperature for testing is set to 50°C. The temperature sensor monitors the temperature value within the temperature control device. When the temperature value is lower than 50°C, the temperature controller controls the heating device 53 to adjust its heating until the temperature within the temperature control device reaches 50°C.

[0037] Furthermore, the temperature control module can transfer heat via water. The temperature control module also includes a temperature control box 54 that houses the container 51. The temperature control box 54 contains a support platform 52 for supporting the container, and the heating device 53 is located below the support platform 52. Specifically, the temperature control box 54 can be a water bath. Inside the water bath, there is a support platform 52 that can support the container 51. The water depth in the water bath exceeds the height of the support platform 52. The support platform 52 is a plate-like structure, with its perimeter fixedly connected to the inner wall of the water bath. This plate-like structure typically has several through holes to facilitate water permeation. That is, when the container 51 is placed on the support platform 52, the water in the water bath surrounds the outer perimeter of the container 51, facilitating uniform heat transfer to the liquid medium within the container 51. Furthermore, the heating device 53 can specifically employ a heating wire or a heating tube, etc. The water bath can easily ensure that the temperature of the liquid medium meets the temperature requirements of the human oral cavity.

[0038] Furthermore, the water bath may also include a top cover with an opening in the center through which the movable end 42 of the sample fixing assembly can pass. The top cover is used to close the upper opening of the water bath to prevent water evaporation and heat loss inside the water bath, thereby saving energy and reducing costs.

[0039] Further explanation: The support assembly 1 includes a support base 11, a support shaft 12, two vertical supports 13 mounted on the support base 11, and a horizontal support 14 connecting the two vertical supports 13. Both ends of the support shaft 12 are respectively mounted on the two horizontal supports 14. In this embodiment, both ends of the support shaft 12 are mounted on the horizontal supports 14 via bearings, allowing the support shaft 12 to rotate freely relative to the horizontal supports 14. The support assembly 1 provided in this embodiment has a simple and stable structure. Of course, the specific structure of the support assembly 1 in other embodiments can be adjusted according to specific circumstances, and no limitations are imposed here.

[0040] Further, in this embodiment, the tensile force application component includes a torque balance arm 21 and a counterweight 22. The torque balance arm 21 is installed perpendicular to the axial direction of the support shaft 12. The first end of the torque balance arm 21 is fixedly connected to the support shaft 12. The second end of the torque balance arm 21, away from the support shaft 12, is equipped with a counterweight 22 of variable weight. The movable end 42 of the sample fixing component is connected to the tensile force application component via a steel wire, rope, etc. The counterweight 22 suspended on the tensile force application component stretches the test sample 6 fixed on the sample fixing component. Furthermore, the displacement measurement component records the displacement of the test sample 6 during the tensile process.

[0041] Further explanation: The torque balance arm 21 includes an arc segment 211 and a connecting arm 212 arranged radially along the arc segment 211. One end of the connecting arm 212 is connected to the arc segment 211, and the other end is provided with a connecting plate 213. The connecting plate 213 is rotatably connected to the support shaft 12 on the support assembly 1, and the radial direction of the arc segment 211 is perpendicular to the axial direction of the support shaft 12. Further, the connecting plate 213 can be fixedly connected to the support shaft 12 by a connector, and the support shaft 12 is mounted on the two transverse supports 14 by bearings, allowing the support shaft 12 to rotate freely relative to the two transverse supports 14. The counterweight 22 is suspended on the arc segment 211 by steel wire, hanging rope, etc. Further, the arc segment 211, the connecting plate 213, and the support shaft 12 are coaxially arranged, that is, the centers of the arc segment 211 and the connecting plate 213 are located on the axial direction of the support shaft 12. More preferably, the arc segment 211, the connecting arm 212, and the connecting disc 213 are integrally formed; furthermore, the arc segment 211 and the connecting arm 212 are hollowed out to minimize the weight of the torque balance arm 21 while ensuring its rigidity.

[0042] Specifically, the counterweight 22 is suspended on the outer ring of the arc segment 211 by steel wire or rope, and the sample fixing assembly holding the test sample 6 is connected to the outer ring of the connecting plate 213 by steel wire or rope. Please refer to [link / reference]. Figure 3 As shown, according to the lever principle, the center point of the support shaft 12 is the fulcrum of the lever, the radius R1 of the arc segment 211 is the effort arm L1, the radius R2 of the connecting plate 213 is the effort arm L2, the weight of the counterweight 22 is the force F1 applied to the effort arm L1, and the constant tension applied to the test sample 6 by the sample fixing assembly is the force F2 on the effort arm L2. According to the lever principle, F1·L1=F2·L2, the constant tension applied to the test sample 6 can be calculated based on the weight of the counterweight 22, the radius R1 of the arc segment 211, and the radius R2 of the connecting plate 213. For example, if the radius R1 of the arc segment 211 is 200mm and the radius R2 of the connecting plate 213 is 20mm, the constant tension applied to the test sample 6 is ten times the weight of the counterweight 22. For example, if the weight of the counterweight 22 is 1N, then the constant tension applied to the test sample 6 is 10N. The counterweight 22 in this application achieves stable tensile testing of the test sample 6 through the torque balance arm 21 and the sample fixing assembly. Utilizing the lever principle, the tensile force applied to the test sample 6 by the counterweight 22 is multiplied, thus enabling high-tensile testing of the test sample 6 without the need for a large-volume, heavy counterweight 22. The counterweight 22 is small in weight and volume, resulting in low cost. Due to the small weight of the counterweight 22, the impact caused by accidental breakage of the test sample 6 under high tensile force is small, reducing the experimental risk factor. Furthermore, because the counterweight 22 is small in mass and volume, there is no need to increase the overall volume of the testing device 100 to accommodate a large-mass counterweight 22, further reducing the volume of the testing device 100 and lowering costs.

[0043] To further explain, in order to counteract the torque generated by the weight of the torque balance arm 21 on the support shaft 12, the testing device 100 of this application also includes a counterweight 23. In this embodiment, the counterweight 23 is directly and fixedly connected to the torque balance arm 21 through a connecting rod, and is disposed on the first end of the torque balance arm 21. The first end is the end that is fixedly connected to the support shaft 12, and the counterweight 23 is disposed on the side away from the second end. The second end is the end that is connected to the arc segment 211.

[0044] Further, the sample fixing assembly includes a first clamping member disposed at the movable end 42 and a second clamping member disposed at the fixed end 41, the first clamping member and the second clamping member respectively clamping and fixing both ends of the test sample 6; wherein, one end of the first clamping member is connected to one end of the tensile force application assembly, and the other end clamps one side of the test sample 6; one end of the second clamping member clamps the other side of the test sample 6, and the other end is fixed to the support assembly 1. More specifically, in this embodiment, one end of the first clamping member is connected to the first end of the torque balance arm 21, i.e., the end connected to the connecting disc 213, via a steel wire or pull rope, and the other end of the first clamping member clamps one side of the test sample 6. In this embodiment, the support assembly 1 further includes a support plate 16 arranged parallel between the two vertical supports 13, and a support crossbeam 15 fixedly connected to the support plate 16. The two ends of the support crossbeam 15 are respectively fixedly connected to the two vertical supports 13. One end of the second clamping member clamps the other side of the test sample 6, and the other end of the second clamping member is fixed to the end of the support plate 16 away from the support crossbeam 15.

[0045] Furthermore, the testing device 100 also includes a movable guide assembly, which includes a slider 45 and a guide structure 46. The guide structure 46 is disposed on the support plate 16, and the extension direction of the guide structure 46 is consistent with the stretching direction of the test sample 6. The upper end of the slider 45 is connected to a steel wire or a pull rope through a lifting eye bolt, and the lower end of the slider 45 is inserted into the guide structure 46 and connected to one end of the first clamping member. The slider 45 can move along the guide structure 46 in the stretching direction.

[0046] Furthermore, in this embodiment, the slider 45 is a strip-shaped structure with a rectangular cross-section. The guide structure 46 consists of two opposing guide rails, the inner contours of which match the outer contours of the corresponding portion of the slider 45. When the slider 45 is inserted into the two guide rails, it is positioned to prevent rotation relative to the guide structure 46, thereby further ensuring measurement accuracy. Alternatively, in other embodiments, the guide structure 46 can be a through hole extending from both ends, with a rectangular cross-section matching the strip-shaped structure. When the slider 45 is inserted into the through hole, it is circumferentially positioned to prevent rotation relative to the through hole, thereby further ensuring measurement accuracy. Of course, the circumferential limiting method of the slider 45 and the guide structure 46 is not limited to the above description. In addition, the cross-sections of the slider 45 and the guide structure 46 can both be matching polygons, or the cross-sections of the slider 45 and the guide structure 46 can be different. For example, the cross-section of the slider 45 is triangular, and the cross-section of the guide structure 46 is rectangular, etc. There are no restrictions here, and they can all be adjusted according to the specific situation.

[0047] Further, the displacement measurement component includes a laser displacement sensor 31 and a laser positioning block 32; the laser positioning block 32 is connected to the movable end 42 of the sample fixing component and changes displacement with the displacement of the test sample 6; the laser displacement sensor 31 is disposed on the support component 1, and the laser beam of the laser displacement sensor 31 is directed toward the laser positioning block 32 to record the displacement change of the test sample 6 during the stretching process; specifically, in this embodiment, the laser positioning block 32 is fixedly connected between the first clamping member and the slider 45, and changes displacement with the up and down movement of the slider 45; the laser displacement sensor 31 is disposed on the support crossbeam 15, and the laser beam emitted by the laser displacement sensor 31 is directed toward the laser positioning block 32, recording the displacement change of the laser positioning block 32, thereby obtaining the displacement change of the test sample 6 during the stretching process; then, the creep performance is calculated according to the national standard GB / T 11546. Based on this embodiment, a large pulling force can be achieved with a small counterweight 22. The structure is simple, which greatly reduces the size of the device and the cost, while also improving the measurement accuracy.

[0048] Of course, in another embodiment, the displacement measurement component may also include an imaging device, which is positioned facing the test sample 6. In this case, at least two marking lines need to be set on the test sample 6, and the distance between adjacent marking lines constitutes a gauge length. The imaging device is used to record the change of the gauge length during the stretching process of the test sample 6, so as to record the displacement change during the stretching process of the test sample 6. Further, the imaging device can be an industrial camera; the imaging device can be set on the vertical support 13. Of course, in another embodiment, the imaging device can also be fixed to the bottom surface or experimental table by a separate fixed bracket, so that the light-incident side of the imaging device is facing the test sample 6.

[0049] Example 2

[0050] To achieve the technical problem that this utility model aims to solve, please refer to... Figure 4 and Figure 5 As shown, this utility model also provides another embodiment. The difference between the testing device 100 in this embodiment and that in embodiment 1 is that the tensile force application component can also be implemented by a fixed pulley 24 and a counterweight 22. Specifically, the two ends of the support shaft 12 are respectively fixedly mounted on the two transverse supports 14, and the fixed pulley 24 and the support shaft 12 are rotatably connected by a bearing. One end of the fixed pulley 24 is suspended by a pull rope with a counterweight 22 of variable weight, and the other end of the fixed pulley 24 is connected to the test sample 6 fixed by the first clamping member by a pull rope. In another embodiment, a constant tension F can be applied directly to one end of the fixed pulley 24. For example, one end of the fixed pulley 24 can be connected to a force-applying machine. Although the fixed pulley 24 cannot save effort, a constant tension F can be applied to one end of the fixed pulley 24. The direction of the tension F can be perpendicular to the stretching direction of the test sample 6. In this way, the height of the testing device 100 can be reduced without increasing the height of the testing device 100, thereby reducing the volume of the testing device 100 and lowering the cost.

[0051] It should be noted that the above embodiments can be freely combined as needed to form different new implementation schemes without causing contradictions. All implementation schemes formed by such combinations are within the protection scope of this application. In order to save space in the application text, they will not be described in detail here.

[0052] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the inventive principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this application.

[0053] Similarly, the above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for testing the tensile creep of a dental diaphragm, characterized in that, It includes a support component, a tensile force application component, a displacement measurement component, a specimen fixing component, and an environmental simulation component, wherein the tensile force application component is connected to the specimen fixing component, and the tensile force application component and the specimen fixing component are mounted on the support component; The tensile force application component is used to apply a constant tensile force to a test sample during the same test process; The sample fixing assembly is fixedly connected to both ends of the test sample, including a fixed end and a movable end connected to the tensile force application assembly. The fixed end is used to restrict the movement of one end of the test sample in the tensile direction, and the movable end is used to pull the other end of the test sample to achieve creep of the test sample in the tensile direction. The displacement measuring component is used to measure the displacement of the test sample in the tensile direction when the tensile force applying component applies a tensile force; and, The environmental simulation component includes a container for holding a liquid medium and a temperature control module for controlling the temperature of the liquid medium. During testing, the test sample is completely immersed in the liquid medium within the container. The length of the container along the stretching direction satisfies the following condition: the test sample is completely immersed in the liquid medium throughout the testing process. The liquid medium is saliva used to simulate the human mouth or a beverage ingested by a person. The temperature control module controls the temperature of the liquid medium to be maintained within a predetermined temperature range during the same testing process.

2. The tensile creep testing device for dental membranes according to claim 1, characterized in that, The temperature control module includes a temperature controller, a temperature sensor, and a heating device, which are respectively communicatively connected to the temperature controller. The temperature controller obtains temperature information within the temperature control module through the temperature sensor. When the temperature information is lower than a predetermined temperature value, the temperature controller controls the heating device to adjust the heating so that the temperature within the temperature control module meets the predetermined temperature value.

3. The tensile creep testing device for dental membranes according to claim 2, characterized in that, The temperature control module uses water for heat transfer. The temperature control module also includes a temperature control box that can house the container box. The temperature control box is also provided with a support platform for supporting the container box, and the heating device is located below the support platform.

4. The tensile creep testing device for dental membranes according to claim 1, characterized in that, The support assembly includes a support base, a support shaft, two vertical supports mounted on the support base, and a horizontal support connecting the two vertical supports. The two ends of the support shaft are respectively mounted on the two horizontal supports.

5. The tensile creep testing device for dental membranes according to claim 4, characterized in that, The tensioning force application component includes a torque balance arm and a counterweight. The torque balance arm is installed perpendicular to the axial direction of the support shaft. The first end of the torque balance arm is fixedly connected to the support shaft. The second end of the torque balance arm away from the support shaft is equipped with a counterweight of variable weight.

6. The tensile creep testing device for dental membranes according to claim 5, characterized in that, The torque balancing arm includes an arc segment and a connecting arm arranged radially along the arc segment; one end of the connecting arm is connected to the arc segment, and the other end is provided with a connecting plate, the connecting plate is rotatably connected to the support shaft on the support assembly, and the radial direction of the arc segment is perpendicular to the axial direction of the support shaft; the counterweight is suspended on the arc segment; wherein, the arc segment, the connecting plate, and the support shaft are coaxially arranged.

7. The tensile creep testing device for dental membranes according to claim 5, characterized in that, It also includes a counterweight to counteract the torque generated by the weight of the torque balance arm on the support shaft; wherein the counterweight is fixedly mounted on the first end of the torque balance arm by a connecting rod and is positioned away from the second end.

8. The tensile creep testing device for dental membranes according to claim 4, characterized in that, The tensioning force application component includes a fixed pulley and a counterweight. The two ends of the support shaft are respectively fixedly mounted on the two transverse supports. The fixed pulley is rotatably connected to the support shaft. One end of the fixed pulley is equipped with a counterweight of variable weight.

9. The tensile creep testing device for dental membranes according to claim 1, characterized in that, The sample fixing assembly includes a first clamping member disposed at the movable end and a second clamping member disposed at the fixed end, which are respectively used to fix the two ends of the sample to be tested; wherein, one end of the first clamping member is connected to one end of the tensile force application assembly, and the other end clamps one side of the sample to be tested; one end of the second clamping member clamps the other side of the sample to be tested, and the other end is fixed to the support assembly.

10. The tensile creep testing device for dental membranes according to claim 1, characterized in that, The displacement measurement component includes a laser displacement sensor and a laser positioning block; the laser positioning block is connected to the movable end of the sample fixing component and its displacement changes with the displacement of the sample under test; the laser displacement sensor is mounted on the support component, and its laser beam is directed towards the laser positioning block to record the displacement changes of the sample under test during the stretching process; or... The displacement measurement component includes an imaging device, which is positioned facing the test sample. At least two marking lines are provided on the test sample, and the distance between adjacent marking lines constitutes a gauge length. The imaging device is used to record the change of the gauge length during the stretching process of the test sample, so as to record the displacement change during the stretching process of the test sample.

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