A tensile creep testing device for a diaphragm

Abstract

The present invention discloses a tensile creep test device for a diaphragm, comprising a bracket, a support shaft, a tensile force-applying assembly, a sample fixing assembly and a tensile test device; the tensile force-applying assembly is rotatably mounted on the bracket via the support shaft; the tensile force-applying assembly comprises a balance arm and a counterweight, and the balance arm is arranged and installed perpendicular to the axial direction of the support shaft, and a counterweight with a variable weight is hung on one end of the balance arm away from the support shaft; the sample fixing assembly is connected to the tensile force-applying assembly via the support shaft, and the counterweight hung on the tensile force-applying assembly is used to stretch the sample to be tested fixed on the sample fixing assembly, and the deformation of the sample to be tested generated during the stretching process is further tested by the tensile test device. The counterweight of the present invention realizes stable stretching of the sample to be tested via the balance arm and the sample fixing assembly, and realizes the effect of amplifying the tension several times by using a counterweight of a relatively small weight, and has a simple structure and accurate and stable tension.

Description

Technical Field

[0001] The invention relates to the technical field of experimental testing equipment, in particular to a tensile creep testing device for a diaphragm. Background Art

[0002] During the production and development of shell-shaped orthodontic appliances, the performance test of the diaphragm used to manufacture the orthodontic appliance is a relatively important parameter acquisition process. Diaphragms with different performance parameters have different correction forces, which also affect the correction effect of the patient. It is very necessary to have a clear, complete and accurate understanding of the diaphragm performance parameters during the correction production process. The acquisition of these parameters requires a large number of experiments to complete, especially the creep parameters of the diaphragm, which will determine the use cycle of the orthodontic appliance and the correction force.

[0003] The creep of the diaphragm refers to the phenomenon that the stress remains unchanged and the strain increases. The key to the tensile creep test is to keep the tension unchanged, which is generally achieved by gravity because only gravity is the most stable. The existing technology also basically relies on adding weight blocks to achieve a stable tension, but the implementation method is different. Some directly add weight blocks to hang and pull. For example, adding a force of 10kg means adding a 10kg iron block to hang. To exert a tension of 100kg, you have to add a 100kg iron block, which leads to high cost and large volume of the weight block. The height of the entire device is too high, and the mobile operation is extremely inconvenient. In order to prevent the sample from breaking and the heavy object from impacting the bottom surface, a buffer protection facility must be set up, which is relatively dangerous. Another way is to use a pulley structure to multiply the force. A set of suspension pulley mechanisms can double the tension. For example, to use a 10kg iron block to achieve a tension of 40kg, two sets of suspension pulley mechanisms are required. The mechanism is relatively complicated, and there will be friction between the pulley mechanisms, and there will be a certain tension loss, resulting in inaccurate actual tension. Summary of the invention

[0004] The technical problem solved by the present invention is to overcome the defects of the prior art and provide a tensile creep testing device for a diaphragm, which can achieve a large-weight tensile effect through a small-mass weight block, has a simple structure, greatly reduces the size of the device, reduces costs, and also improves measurement accuracy.

[0005] The technical solution of the present invention is:

[0006] A tensile creep test device for a diaphragm, comprising a bracket, a support shaft, a tensile force application component, a sample fixing component and a tensile test device;

[0007] The stretching force applying component is rotatably mounted on the bracket via the support shaft;

[0008] The tensile force application component includes a balance arm and a counterweight, and the balance arm is installed perpendicular to the axial direction of the support shaft, and the counterweight with a variable weight is suspended on one end of the balance arm away from the support shaft;

[0009] The sample fixing assembly is connected to the stretching force applying assembly via the supporting shaft, and the test sample fixed on the sample fixing assembly is stretched by the counterweight hung on the stretching force applying assembly, and the deformation of the test sample generated during the stretching process is further tested by the stretching testing device.

[0010] In some embodiments, the balance 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 connected to the support shaft, and the radial direction of the arc segment is perpendicular to the axial direction of the support shaft; the counterweight is suspended on one end of the arc segment.

[0011] In some embodiments, the arc segment is coaxially arranged with the support shaft.

[0012] In some embodiments, a first connecting disk is disposed on the other end of the connecting arm, the first connecting disk is coaxially sleeved on the supporting shaft, and the first connecting disk and the supporting shaft are fixedly connected via a first connecting member.

[0013] In some embodiments, a counterweight block is further provided on the support shaft, and the counterweight block is used to offset the torque generated by the weight of the balance arm itself on the support shaft.

[0014] In some embodiments, the counterweight block includes a weight block and a weight block connecting rod, one end of the weight block connecting rod is threadedly connected to the weight block, and the other end is connected to the support shaft perpendicular to the axial direction of the support shaft.

[0015] In some embodiments, a second connection plate is provided at the other end of the weight block connection arm, the second connection plate is coaxially sleeved on the support shaft, and the second connection plate and the support shaft are fixedly connected by a second connecting member.

[0016] In some embodiments, the sample fixing assembly includes a first clamping member and a second clamping member, one end of the first clamping member is connected to the support shaft, 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 bracket; and the clamping and stretching direction of the first clamping member and the second clamping member for the sample to be tested is perpendicular to the axial direction of the support shaft.

[0017] In some embodiments, a temperature control box is further included, which is installed on the bracket; the first clamping member, the second clamping member and the sample to be tested are located in the temperature control box, and the first clamping member is connected to the support shaft through a pull rope passing through the temperature control box.

[0018] In some embodiments, the temperature control box is provided with a control device, and a temperature sensor and a heating device respectively connected to the control device; the control device obtains the temperature information in the temperature control box through the temperature sensor, and when the temperature information does not meet the preset value, the control device controls the heating device to adjust the heating so that the temperature in the temperature control box meets the preset temperature value.

[0019] In some embodiments, a humidity sensor and a humidifying device are also provided in the temperature control box; the control device obtains the humidity information in the temperature control box through the humidity sensor, and when the humidity information does not meet the preset value, the control device controls the humidifying device to perform humidification adjustment so that the humidity in the temperature control box meets the preset humidity value.

[0020] In some embodiments, the pull rope passes through the temperature control box through a movable guide assembly.

[0021] In some embodiments, the movable guide assembly includes a slider and a guide structure arranged on the temperature control box, the guide structure has a sliding hole, the slider is inserted into the sliding hole and is circumferentially limited, and the slider can move along the sliding hole in a direction perpendicular to the support axis; one end of the slider is connected to the first clamping member, and the other end is connected to the pull rope.

[0022] In some embodiments, the cross-sections of the slider and the sliding hole are matching rectangles, and the slider is inserted into the sliding hole to achieve circumferential limitation.

[0023] In some embodiments, an observation window is provided on the temperature control box at a position corresponding to the sample to be tested.

[0024] In some embodiments, the bracket includes a base, two vertical brackets arranged on the base, and a horizontal bracket connecting the two vertical brackets; the two ends of the support shaft are respectively connected to the two vertical brackets, and the horizontal bracket, the base, and the support shaft are arranged parallel to each other; the temperature control box is located below the horizontal bracket, and its two sides are respectively connected to the two vertical brackets; the end of the second clamp away from the test sample passes through the bottom of the temperature control box and is fixedly connected to the base.

[0025] In some embodiments, the stretching test device uses an angle measuring device, which is arranged on the bracket to measure the rotation angle of the support shaft during the stretching of the test sample; the angle measuring device uses an encoder, which is connected to the support shaft.

[0026] In some embodiments, the stretching test device uses a photographing device, which is disposed toward the sample to be tested and is used to record changes in the sample to be tested during the stretching process.

[0027] In some embodiments, a gauge length is provided on the test sample, and the photographing device is used to record the change of the gauge length during the stretching process of the test sample.

[0028] In some embodiments, at least two marking lines are provided on the sample to be tested, and a gauge distance is formed between adjacent marking lines.

[0029] In some embodiments, a limiting component is also included to limit the rotation of the support shaft.

[0030] In some embodiments, the limiting component includes a winding wheel, a pull wire and a driving device, the driving device is installed on the bracket to drive the winding wheel to rotate, one end of the pull wire is connected to the winding wheel, and the other end is connected to the balance arm.

[0031] The tensile creep test device for the diaphragm provided by the present invention has the following advantages and positive effects compared with the prior art:

[0032] 1. In the tensile creep test device for the diaphragm provided by the present invention, the counterweight achieves stable stretching of the test sample through a balance arm and a sample fixing assembly, wherein the lever principle is utilized to multiply the pulling force applied to the test sample by the counterweight, thereby enabling a large tensile force test of the test sample to be achieved without using a large-volume and heavy counterweight, and the counterweight has a small weight, a small volume, and a low cost; due to the small weight of the counterweight, the impact of the test sample being broken due to accidental factors under a large tensile force is small, and the experimental risk factor is small; in addition, because the counterweight has a small mass and volume, there is no need to increase the overall volume of the test device to adapt to the large-mass counterweight, thereby further reducing the volume of the test device and reducing the cost.

[0033] 2. In the tensile creep test device for the diaphragm provided by the present invention, the tensile test device adopts two methods to perform measurements. One method is to calculate the tensile length of the test sample by reading the rotation angle of the encoder connected to the support shaft, and then calculate the corresponding strain; the other method is to use a photographing device to take a picture and measure the gauge length on the test sample, so as to calculate the corresponding strain; both methods can achieve very high measurement accuracy, and the present application provides technicians with a variety of testing methods.

[0034] 3. In the tensile creep test device for the diaphragm provided by the present invention, the sample to be tested is placed in a temperature control box for testing. The temperature control box is used to simulate the actual use environment of the sample to be tested, which is beneficial to improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the three-dimensional structure of the tensile creep test device of the diaphragm provided by the present invention Figure 1 ;

[0036] Figure 2 Schematic diagram of the three-dimensional structure of the tensile creep test device of the diaphragm provided by the present invention Figure 2 ;

[0037] Figure 3 A side view of a tensile creep testing device for a diaphragm provided by the present invention;

[0038] Figure 4 It is a schematic diagram of the structure of the balance arm in the present invention. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0040] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0041] Reference Figure 1-4The present invention provides an embodiment of a tensile creep test device for a diaphragm, the test device comprising a bracket 1, a support shaft 10, a tensile force-applying assembly, a sample fixing assembly and a tensile test device; the tensile force-applying assembly is rotatably mounted on the bracket 1 via the support shaft 10; the tensile force-applying assembly comprises a balancing arm 6 and a counterweight 2, and the balancing arm 6 is arranged and installed perpendicular to the axial direction of the support shaft 10, and a counterweight 2 with a variable weight is suspended on one end of the balancing arm 6 away from the support shaft 10; the sample fixing assembly is connected to the tensile force-applying assembly via the support shaft 10, and a test sample 14 fixed on the sample fixing assembly is stretched by the counterweight 2 suspended on the tensile force-applying assembly, and the deformation of the test sample 14 generated during the stretching process is further tested by the tensile test device.

[0042] The tensile creep test device for the diaphragm provided by the present invention has a counterweight that realizes stable stretching of the test sample through a balance arm and a sample fixing assembly, wherein the lever principle is utilized to multiply the tension applied to the test sample by the counterweight, thereby enabling a large tensile test of the test sample to be achieved without using a large-volume and heavy-weight counterweight, and the counterweight has a small weight, a small volume, and a low cost; due to the small weight of the counterweight, the impact caused by the breakage of the test sample due to accidental factors under a large tensile force is small, and the experimental risk factor is small; in addition, because the counterweight has a small mass and volume, there is no need to increase the overall volume of the test device to adapt to the large-mass counterweight, thereby further reducing the volume of the test device and reducing the cost.

[0043] In this embodiment, the bracket 1 includes a base 102, two vertical brackets 101 arranged on the base 102, the upper ends of the two vertical brackets 101 are connected with a horizontal bracket 104, and a reinforcing member 103 is arranged at the connection between the vertical bracket 101 and the base 102; the two ends of the support shaft 10 are respectively connected to the two vertical brackets 101, and the horizontal bracket 104, the base 102, and the support shaft 10 are arranged parallel to each other; further, the two ends of the support shaft 10 are respectively installed on the vertical bracket 101 through bearings 1001, so that the support shaft 10 can rotate freely relative to the bracket 1. The bracket 1 provided in this embodiment has a simple and stable structure. Of course, the specific structure of the bracket in other embodiments can also be adjusted according to specific circumstances, which is not limited here.

[0044] In this embodiment, refer to Figure 4 The balance arm 6 includes an arc segment 601 and a connecting arm 602 arranged radially along the arc segment 601; one end of the connecting arm 602 is connected to the arc segment 601, and the other end is connected to the support shaft 10, and the radial direction of the arc segment 601 is perpendicular to the axial direction of the support shaft 10; the counterweight 2 is suspended on one end of the arc segment 601.

[0045] The arc segment 601 is coaxially arranged with the support shaft 10 , that is, the center of the arc segment 601 is located in the axial direction of the support shaft 10 .

[0046] Among them, a first connection disk 603 is arranged on the other end of the connection arm 602, and the first connection disk 603 is arranged coaxially with the arc segment 601; the other end of the connection arm 602 is coaxially sleeved on the support shaft 10 through the first connection disk 603, and the first connection disk 603 can preferably rotate relative to the support shaft 10 to adjust the position of the balance arm 6. Further, the first connection disk 603 and the support shaft 10 are also fixedly connected by a first connecting member 604, and the first connecting member 604 is preferably a screw, and the first support disk 603 and the support shaft 10 are provided with threaded holes, and the screw is screwed in the threaded hole to achieve a fixed connection between the first connection disk 603 and the support shaft 10; of course, in other embodiments, the connection between the first connection disk 603 and the support shaft 10 can also be achieved through other structures, such as positioning pins and other structures, which are not limited here.

[0047] Among them, the arc segment 601, the connecting arm 602 and the first connecting plate 603 are preferably designed to be integrally formed, and the arc segment 601 and the connecting arm 602 are further hollowed out to reduce the weight of the balancing arm as much as possible while ensuring the rigidity of the balancing arm 6.

[0048] In this embodiment, the counterweight 2 is suspended on the outer ring of the arc segment 601 by the drawstring 5, and the sample fixing assembly holding the sample 14 to be tested is connected to the outer ring of the first connection plate 603 by the drawstring 19. According to the lever principle, the center point of the support shaft 10 is the fulcrum of the lever, the radius R1 of the arc segment 601 is the power arm L1, the radius R2 of the first connection plate 603 is the power arm L2, the gravity of the counterweight 2 is the force F1 applied to the power arm L1, and the tensile force applied by the sample fixing assembly to the sample to be tested is the force F2 on the power arm L2. According to the lever principle F1·L1=F2·L2, the tensile force applied to the sample to be tested can be calculated according to the weight of the counterweight 2, the radius R1 of the arc segment 601, and the radius R2 of the first connection plate 603. For example, in this embodiment, the radius R1 of the arc segment 601 is 500 mm, and the radius R2 of the first connecting plate 603 is 50 mm. At this time, the tension applied to the sample to be tested is ten times the gravity of the counterweight 2. For example, if the gravity of the counterweight 2 is 10N, then the tension applied to the sample to be tested is 100N.

[0049] Of course, in other embodiments, the pattern fixing assembly that clamps the sample 14 to be tested is suspended on the outer ring of the support shaft 10 by the pull rope 19. In this case, the power arm L2 is the radius of the support shaft 10. Alternatively, the pattern fixing assembly that clamps the sample 14 to be tested can also be connected to other structures coaxially arranged on the support shaft by the pull rope. There is no limitation here and it can be adjusted according to specific circumstances.

[0050] In this embodiment, the pull rope 5 is connected to the counterweight 2 via the eye bolt 3, wherein the counterweight 2 can be replaced according to the specific tension applied to the sample to be tested.

[0051] In this embodiment, a counterweight 11 is further provided on the support shaft 10, and the counterweight 11 is used to offset the torque generated by the weight of the balance arm 6 on the support shaft 10. Further, the counterweight 11 includes a weight block and a weight block connecting rod, one end of the weight block connecting rod is connected to the weight block, and the other end is connected to the support shaft 10 perpendicular to the axial direction of the support shaft 10.

[0052] Among them, one end of the weight block connecting rod is threadedly connected to the weight block, so that the distance between the weight block and the support shaft 10 can be adjusted, so that the balance arm can be balanced and still when it rotates to any position. Of course, in other embodiments, the adjustable manner between the weight block connecting rod and the weight block is not limited to the above, and can be set according to specific circumstances.

[0053] Among them, a second connecting plate 1101 is provided at the other end of the weight block connecting arm, and the second connecting plate 1101 is coaxially sleeved on the support shaft 10 and can be rotated and adjusted relative to the support shaft 10; further, the second connecting plate 1101 and the support shaft 10 are fixedly connected by a second connecting member 1102. Preferably, the second connecting member 1102 is a screw, and threaded holes are provided on the second connecting plate 1101 and the support shaft 10. The screw is screwed into the threaded hole to achieve a fixed connection between the second connecting plate 11013 and the support shaft 10; of course, in other embodiments, the connection method between the second connecting plate 1101 and the support shaft 10 can also be achieved by other structures, such as positioning pins and other structures, which are not limited here.

[0054] In this embodiment, the sample fixing assembly includes a first clamping member 13 and a second clamping member 18, and the sample 14 to be tested is clamped between the first clamping member 13 and the second clamping member 18. Specifically, one end of the first clamping member 13 is connected to the outer ring of the first connecting plate 603 on the support shaft 10 through a pull rope 19, and the other end clamps one side of the sample to be tested; one end of the second clamping member 18 clamps the other side of the sample to be tested 14, and the other end is fixed to the base 102 of the bracket 1 through a support rod, so that the second clamping member 18 is fixedly arranged relative to the bracket 1; wherein, the clamping and stretching direction of the first clamping member 13 and the second clamping member 18 for the sample 14 to be tested is perpendicular to the axial direction of the support shaft 10, so as to ensure the accuracy of the test.

[0055] The first clamping member 13 and the second clamping member 18 have the same structure, both of which are a clamping block, and the clamping block has a clamping opening, and the two opposite sides of the sample 14 to be tested are clamped in the two clamping openings respectively, and fixedly connected by connecting members such as screws. Of course, in other embodiments, the structural form of the first clamping member 13 and the second clamping member 18 is not limited to the above, and other structural members with fixing functions can be selected, which is not limited here.

[0056] In this embodiment, the tensile creep test device of the diaphragm further includes a temperature control box 15 , and the sample 14 to be tested is placed in the temperature control box 15 to simulate the use environment of the sample 14 to be tested, so as to improve the accuracy of the test.

[0057] Specifically, the temperature control box 15 is provided with a control device, and a temperature sensor and a heating device respectively connected to the control device. The temperature sensor and the heating device are used to control the temperature conditions in the temperature control box 15; the control device obtains the temperature information in the temperature control box 15 through the temperature sensor. When the temperature information does not meet the preset value, the control device controls the heating device to adjust the heating so that the temperature in the temperature control box 15 meets the preset temperature value.

[0058] Furthermore, the temperature control box 15 may also be provided with a humidity sensor and a humidifying device, which are used to control the humidity conditions in the temperature control box 15; the control device obtains the humidity information in the temperature control box 15 through the humidity sensor, and when the humidity information does not meet the preset value, the control device controls the humidifying device to perform humidification adjustment so that the humidity in the temperature control box 15 meets the preset humidity value.

[0059] Furthermore, the heating device may specifically be a heating wire or the like, and the humidifying device may be a spray or the like, and there is no limitation here and they may be adjusted according to specific circumstances.

[0060] In this embodiment, the first clamping member 13, the second clamping member 18 and the test sample 14 are all located in the temperature control box 15, and the pull rope 19 passes through the top of the temperature control box 15 through the movable guide component 12 to connect to the first clamping member 13; in this embodiment, the movable component 13 is set to ensure the stability of the tension applied to the test sample 14, so that it can be stably stretched in a direction perpendicular to the axial direction of the support shaft 10 to prevent it from shaking in the horizontal direction, thereby ensuring the accuracy of the measurement.

[0061] Furthermore, the movable guide assembly 12 includes a slider 1201 and a guide structure 1202. The guide structure 1202 is arranged on the temperature control box 15. The guide structure 1202 has a sliding hole, and the extension direction of the sliding hole is perpendicular to the axial direction of the support shaft 10; a through hole is arranged at the top of the temperature control box 15 corresponding to the sliding hole, and the through hole is coaxially arranged with the sliding hole for communication; the upper end of the slider 1201 is connected to the pull rope 19 through a lifting eye bolt, and the lower end of the slider 1201 is inserted into the sliding hole and passes through the through hole into the temperature control box 15 to be connected to the first clamping member 13, and the slider 1201 can move along the sliding hole in a direction perpendicular to the support shaft 10.

[0062] Furthermore, the slider 1201 is a strip-like structure with a rectangular cross-section, and the corresponding sliding hole has a matching rectangular cross-section. When the slider 1201 is inserted into the sliding hole, circumferential limitation can be achieved to prevent the slider 1201 from rotating relative to the sliding hole, thereby further ensuring the measurement accuracy; of course, the circumferential limitation method of the slider 1201 and the sliding hole is not limited to the above description, and the cross-sections of the slider 1201 and the sliding hole can also be matching polygons, or the cross-sections of the slider and the sliding hole can be different, for example, the cross-section of the slider 1201 is triangular, the cross-section of the sliding hole is rectangular, and so on. There is no limitation here, and it can be adjusted according to the specific situation.

[0063] In this embodiment, the temperature control box 15 has a door in front, so that it can be opened to disassemble and install the sample to be tested; an observation window 1501 is set on the door corresponding to the sample to be tested 14, so that the sample to be tested can be observed during the test. The observation window can be realized by a glass window structure, which is not limited here.

[0064] Furthermore, the temperature control box 15 is located between the two vertical brackets 101 , and the left and right sides of the temperature control box 15 are respectively connected to the two vertical brackets 101 to achieve fixation.

[0065] In this embodiment, the tensile testing device includes an angle measuring device, which is used to measure the rotation angle of the support shaft 10 during the test. The corresponding arc length can be calculated based on the rotation angle of the support shaft 10 and the diameter of the support shaft. The arc length is the tensile length of the sample to be tested, and the creep performance can be calculated based on this.

[0066] Furthermore, the angle measuring device uses an encoder 4, which is connected to the support shaft 10 and is used to measure its rotation angle at all times. Of course, other angle measuring devices can also be used in other embodiments, which are not limited here.

[0067] In this embodiment, the stretching test device also includes a photographing device 16, and the photographing direction of the photographing device 16 is set to face the test sample 14. The photographing device 16 observes the test sample 14 through the observation window. The photographing device 16 is used to record the changes in the preset gauge length on the test sample 14 during the stretching process.

[0068] Two marking lines are provided on the test sample 14, and the gauge length is formed between adjacent marking lines 1302. The gauge length between the two marking lines changes during the stretching process of the test sample 14, and the stretching ends until the set tension value or a certain displacement value is reached, or the stretching ends until the fracture.

[0069] The test sample 14 uses an industrial camera, such as a laser extensometer or other equipment, which is not limited here and can be adjusted according to specific circumstances.

[0070] In this embodiment, an encoder and an industrial camera are used as tensile testing devices, which can achieve very high measurement accuracy; the encoder accuracy can reach 0.005°, the radius of the support shaft 10 is 50mm, and the measurement accuracy of the tensile length of the specimen is 50*0.005*3.14159 / 180=0.00436mm; the industrial camera has 5 million pixels, and the longitudinal strain accuracy measurement can reach 1 / 2500=0.0004. If an industrial camera with a higher pixel point is selected, the accuracy will be higher.

[0071] Of course, in other embodiments, only one of the angle measuring device or the photographing device 16 may be selected as the stretching test device, which is not limited here and can be selected according to specific circumstances; alternatively, in other embodiments, the stretching test device may also require other structural forms, which is not limited here either.

[0072] In this embodiment, the tensile creep testing device of the diaphragm also includes a limiting component for limiting the rotation of the support shaft 10 before the test, so as to avoid stretching of the test sample 14 before the test and during the preparation process, thereby affecting the subsequent test structure.

[0073] Specifically, the limiting component includes a winding wheel 8, a cable 7 and a driving device 9. The driving device is installed on the horizontal bracket 104 at the top of the bracket 1 and is connected to the winding wheel 8 to drive the winding wheel 8 to rotate. One end of the cable 7 is wound on the winding wheel 8, and the other end is connected to the balance arm 6. The driving device 9 drives the winding wheel 8 to rotate to achieve the winding or sending of the cable, thereby achieving the lifting or release of the balance arm 6. Furthermore, the driving device 9 can specifically adopt a driving device such as a reduction motor, which is not limited here.

[0074] The limiting component provided in this embodiment has a simple structure, is easy to operate and stable. Of course, limiting components with other structures can also be selected in other embodiments. This is not limited here and can be adjusted accordingly according to specific circumstances.

[0075] The working principle of the tensile creep testing device for the diaphragm provided by the present invention is described below:

[0076] First, adjust the distance between the weight block on the counterweight block 11 and the support shaft 10 to balance the weight torque of the balance arm itself, so that the balance arm 6 can be balanced and stationary at any position when it rotates; then, select the middle counterweight 2 suspended on the balance arm 10 according to the required pulling force. For example, when the pulling force to be applied is 100N, select a 10N counterweight 2;

[0077] Then, the driving device 9 (reduction motor) is started to drive the winding wheel 8 to rotate, and the winding wheel 8 rotates to pull the cable 7 to lift the balance arm 6; the door of the temperature control box 15 is opened, and the test sample 14 is installed between the first clamping member 13 and the second clamping member 18. After the test sample is installed, the driving device 9 is started to rotate the winding wheel 8 in the opposite direction, and the cable 7 is gradually loosened until it is completely loosened. At this time, the 10 times weight tension of the counterweight will be added to the test sample.

[0078] Then, the rotation angle of the encoder is monitored in real time, or the test piece is continuously photographed through the observation window 1501 by the photographing device 16, so as to calculate the tensile change of the test piece at any time, and the calculation method of the creep performance is calculated according to the national standard GB / T 11546. Based on the embodiment provided by the present application, a large weight tensile effect can be achieved by a small weight block, the structure is simple, the volume of the device is greatly reduced, the cost is reduced, and the measurement accuracy is improved.

[0079] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A tensile creep test device for a membrane, characterized in that: It includes a bracket, a support shaft, a tensile force application component, a sample fixing component and a tensile testing device; The stretching force applying component is rotatably mounted on the bracket via the support shaft; The tensile force application component includes a balance arm and a counterweight, and the balance arm is installed perpendicular to the axial direction of the support shaft, and the counterweight with a variable weight is suspended on one end of the balance arm away from the support shaft; The sample fixing assembly is connected to the stretching force applying assembly through the supporting shaft, the counterweight suspended on the stretching force applying assembly is used to stretch the sample to be tested fixed on the sample fixing assembly, and the deformation of the sample to be tested generated during the stretching process is further tested by the stretching testing device; The tensile creep testing device for the diaphragm also includes a limiting component for limiting the rotation of the support shaft, and the limiting component is used to avoid stretching of the test sample before the test and during the preparation process.

2. The tensile creep testing device for a membrane according to claim 1, characterized in that: The balancing arm comprises 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 connected to the supporting shaft, and the radial direction of the arc segment is perpendicular to the axial direction of the supporting shaft; the counterweight is suspended on one end of the arc segment.

3. The tensile creep testing device for a membrane according to claim 2, characterized in that: The arc segment is coaxially arranged with the support shaft.

4. The tensile creep testing device for a membrane according to claim 2 or 3, characterized in that: A first connecting disk is arranged on the other end of the connecting arm. The first connecting disk is coaxially sleeved on the supporting shaft, and the first connecting disk is fixedly connected to the supporting shaft via a first connecting member.

5. The tensile creep testing device for a diaphragm according to claim 1, characterized in that: A counterweight block is also provided on the support shaft, and the counterweight block is used to offset the torque generated by the weight of the balance arm itself on the support shaft.

6. The tensile creep testing device for a membrane according to claim 4, characterized in that: The counterweight block includes a weight block and a weight block connecting rod, one end of the weight block connecting rod is threadedly connected to the weight block, and the other end is connected to the support shaft perpendicular to the axial direction of the support shaft; A second connection disk is disposed at the other end of the weight block connection arm. The second connection disk is coaxially sleeved on the support shaft, and the second connection disk is fixedly connected to the support shaft via a second connecting member.

7. The tensile creep testing device for a membrane according to claim 1, characterized in that: The sample fixing assembly includes a first clamping member and a second clamping member, one end of the first clamping member is connected to the support shaft, 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 bracket; and the clamping and stretching direction of the first clamping member and the second clamping member for the sample to be tested is perpendicular to the axial direction of the support shaft.

8. The tensile creep testing device for a membrane according to claim 7, characterized in that: It also includes a temperature control box, which is installed on the bracket; the first clamping member, the second clamping member and the sample to be tested are located in the temperature control box, and the first clamping member is connected to the support shaft through a pull rope that runs through the temperature control box.

9. The tensile creep testing device for a membrane according to claim 8, characterized in that: The temperature control box is provided with a control device, and a temperature sensor, a heating device, a humidity sensor, and a humidifying device respectively connected to the control device; The control device obtains the temperature information in the temperature control box through the temperature sensor. When the temperature information does not meet the preset value, the control device controls the heating device to adjust the heating so that the temperature in the temperature control box meets the preset temperature value; The control device obtains humidity information in the temperature control box through the humidity sensor. When the humidity information does not meet a preset value, the control device controls the humidification device to perform humidification adjustment so that the humidity in the temperature control box meets a preset humidity value.

10. The tensile creep testing device for a membrane according to claim 8, characterized in that: The pull rope passes through the temperature control box through a movable guide assembly; The movable guide assembly includes a slider and a guide structure arranged on the temperature control box, the guide structure has a slide hole, the slider is inserted into the slide hole and is circumferentially limited, and the slider can move along the slide hole in a direction perpendicular to the support shaft; one end of the slider is connected to the first clamping member, and the other end is connected to the pull rope; The cross sections of the slider and the sliding hole are in matching rectangular shapes, and the slider is inserted into the sliding hole to achieve circumferential limiting.

11. The tensile creep testing device for a membrane according to claim 8, characterized in that: An observation window is arranged on the temperature control box at a position corresponding to the sample to be tested.

12. The tensile creep testing device for a membrane according to claim 8, characterized in that: The bracket includes a base, two vertical brackets arranged on the base, and a horizontal bracket connecting the two vertical brackets; the two ends of the support shaft are respectively connected to the two vertical brackets, and the horizontal bracket, the base, and the support shaft are arranged parallel to each other; the temperature control box is located below the horizontal bracket, and its two sides are respectively connected to the two vertical brackets; the end of the second clamp away from the sample to be tested passes through the bottom of the temperature control box and is fixedly connected to the base.

13. The tensile creep testing device of a membrane according to claim 1, characterized in that: The tensile testing device adopts an angle measuring device, and the angle measuring device is arranged on the bracket to measure the rotation angle of the support shaft during the stretching process of the test sample; The angle measuring device adopts an encoder, and the encoder is connected to the supporting shaft.

14. The tensile creep testing device for a membrane according to claim 1 or 11, characterized in that: The stretching test device adopts a photographing device, which is arranged toward the sample to be tested and is used to record changes in the sample to be tested during the stretching process.

15. The tensile creep testing device for a membrane according to claim 14, characterized in that: At least two marking lines are arranged on the sample to be tested, and a gauge length is formed between adjacent marking lines. The photographing device is used to record the change of the gauge length during the stretching process of the sample to be tested.

16. The tensile creep testing device for a membrane according to claim 1, characterized in that: The limiting component includes a winding wheel, a pulling wire and a driving device. The driving device is installed on the bracket to drive the winding wheel to rotate. One end of the pulling wire is connected to the winding wheel, and the other end is connected to the balance arm.

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