CN112432860A - Tensile creep testing arrangement of diaphragm - Google Patents
Tensile creep testing arrangement of diaphragm Download PDFInfo
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- CN112432860A CN112432860A CN202011367997.6A CN202011367997A CN112432860A CN 112432860 A CN112432860 A CN 112432860A CN 202011367997 A CN202011367997 A CN 202011367997A CN 112432860 A CN112432860 A CN 112432860A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
Abstract
The invention discloses a tensile creep testing device of a diaphragm, which comprises a bracket, a supporting shaft, a tensile force application assembly, a sample fixing assembly and a tensile testing device, wherein the supporting shaft is arranged on the bracket; the stretching force application assembly is rotatably arranged on the bracket through a support shaft; the stretching force application assembly comprises a balance arm and a counterweight, the balance arm is perpendicular to the axial direction of the support shaft and is arranged, and the counterweight with variable weight is hung at one end of the balance arm far away from one side of the support shaft; the sample fixing assembly is connected with the stretching force application assembly through a support shaft, a sample piece to be tested is fixed on the counterweight stretching sample fixing assembly hung on the stretching force application assembly, and further deformation of the sample piece to be tested in the stretching process is tested through the stretching test device. The counterweight weight realizes the stable stretching of the sample piece to be tested through the balance arm and the sample fixing assembly, realizes the effect of amplifying the tension by multiple times by using the counterweight weight with smaller weight, and has simple structure and accurate and stable tension.
Description
Technical Field
The invention relates to the technical field of experimental test equipment, in particular to a tensile creep test device for a membrane.
Background
In the production and development process of the shell-shaped appliance, the performance test of the diaphragm for manufacturing the appliance is an important parameter acquisition process, and the diaphragm with different performance parameters has different correction force, so that the correction effect of a patient is influenced; it is necessary to know the diaphragm performance parameters clearly, completely and accurately in the correction production process, and the acquisition of the parameters can be completed by a large amount of experiments, especially the creep parameters of the diaphragm, which determine the service cycle of the corrector and the correction force.
Creep of the diaphragm refers to a phenomenon in which the stress is not changed and the strain is increased. The tensile creep test is critical to keep the tensile force constant and is generally realized by relying on gravity, because only gravity is the most stable. The prior art basically depends on a weighting gauge block to realize a stable pulling force, and only the realization mode is different. Some devices directly increase the weight block hanging pull, for example, 10kg of force is added, namely 10kg of iron block hanging is added, 100kg of pull force needs to be added, so that the weight block is high in cost and large in size, the whole device is too high, the moving operation is very inconvenient, and in order to prevent a sample fracture heavy object from impacting the bottom surface, a buffer protection facility needs to be arranged, so that the device is dangerous. In addition, the acting force is doubled by adopting a pulley structure, the pulling force can be doubled by adopting one set of hanging pulley mechanism, for example, 2 sets of hanging pulley mechanisms are needed for realizing 40kg of pulling force by using 10kg of iron blocks, the mechanisms are relatively complex, and the pulley mechanisms have friction force and certain pulling force loss, so that the actual pulling force is inaccurate.
Disclosure of Invention
The technical problem solved by the invention is to overcome the defects in the prior art, and provide the tensile creep testing device for the diaphragm, which can realize the tensile force effect of large weight through the weight block with small mass, has simple structure, greatly reduces the volume of the device, reduces the cost and simultaneously improves the measurement precision.
The technical scheme of the invention is as follows:
a tensile creep testing device for a membrane comprises a support, a support shaft, a tensile force application assembly, a sample fixing assembly and a tensile testing device;
the stretching force application assembly is rotatably arranged on the bracket through the supporting shaft;
the stretching force application assembly comprises a balance arm and a counterweight, the balance arm is perpendicular to the axial direction of the support shaft and is arranged, and the counterweight with variable weight is hung on one end of the balance arm away from one side of the support shaft;
the sample fixing assembly is connected with the stretching force application assembly through the support shaft, the counterweight hung on the stretching force application assembly stretches a sample piece to be tested fixed on the sample fixing assembly, and further the deformation of the sample piece to be tested in the stretching process is tested through the stretching test device.
In some embodiments, the balance arm comprises a circular arc segment and a connecting arm arranged in a radial direction of the circular arc segment; one end of the connecting arm is connected with the arc section, the other end of the connecting arm is connected with the supporting shaft, and the radial direction of the arc section is perpendicular to the axial direction of the supporting shaft; the counterweight is hung at one end of the arc section.
In some embodiments, the arc segment is disposed coaxially with the support shaft.
In some embodiments, a first connecting disc is disposed at the other end of the connecting arm, the first connecting disc is coaxially sleeved on the supporting shaft, and the first connecting disc is fixedly connected with the supporting shaft through a first connecting piece.
In some embodiments, a balancing weight is further disposed on the supporting shaft, and the balancing weight is used for offsetting the moment generated by the self weight of the balancing arm to the supporting shaft.
In some embodiments, the weight block includes a weight and a weight connecting rod, one end of the weight connecting rod is connected with the weight through threads, and the other end of the weight connecting rod is connected to the supporting shaft perpendicular to the axial direction of the supporting shaft.
In some embodiments, the other end of the weight connecting arm is provided with a second connecting disc, the second connecting disc is coaxially sleeved on the supporting shaft, and the second connecting disc is fixedly connected with the supporting shaft through a second connecting piece.
In some embodiments, the sample fixing assembly comprises a first clamping member and a second clamping member, one end of the first clamping member is connected with the supporting shaft, and the other end of the first clamping member clamps one side of the sample to be tested; one end of the second clamping piece clamps the other side of the sample piece to be tested, and the other end of the second clamping piece is fixed on the bracket; and the clamping and stretching directions of the first clamping piece and the second clamping piece to the sample piece to be tested are perpendicular to the axial direction of the supporting shaft.
In some embodiments, the temperature control box is further included and is mounted on the bracket; the first clamping piece, the second clamping piece and the sample piece to be tested are positioned in the temperature control box, and the first clamping piece is connected with the supporting shaft through a pull rope penetrating through the temperature control box.
In some embodiments, a control device, a temperature sensor and a heating device are arranged in the temperature control box, and the temperature sensor and the heating device are respectively connected with the control device; the control device obtains temperature information in the temperature control box through the temperature sensor, and when the temperature information does not meet a preset value, the control device controls the heating device to heat and adjust, so that the temperature in the temperature control box meets a preset temperature value.
In some embodiments, a humidity sensor and a humidifying device are further arranged in the temperature control box; the control device acquires humidity information in the temperature control box through the humidity sensor, and when the humidity information does not meet a preset value, the control device controls the humidifying device to perform humidification adjustment so that the humidity in the temperature control box meets a preset humidity value.
In some embodiments, the pull cord is threaded through the temperature control cabinet by a travel guide assembly.
In some embodiments, the moving guide assembly comprises a sliding block and a guide structure arranged on the temperature control box, the guide structure is provided with a sliding hole, the sliding block is arranged in the sliding hole in a penetrating manner and is limited in the circumferential direction, and the sliding block can move along the sliding hole in the direction perpendicular to the support shaft; one end of the sliding block is connected with the first clamping piece, and the other end of the sliding block is connected with the pull rope.
In some embodiments, the cross sections of the sliding block and the sliding hole are in matched rectangles, and the sliding block is inserted into the sliding hole to realize circumferential limit.
In some embodiments, an observation window is arranged on the temperature control box corresponding to the sample to be tested.
In some embodiments, the bracket comprises a base, two vertical brackets arranged on the base, and a transverse bracket connecting the two vertical brackets; two ends of the supporting shaft are respectively connected to the two vertical supports, and the transverse support, the base and the supporting shaft are arranged in parallel; the temperature control box is positioned below the transverse support, and two sides of the temperature control box are respectively connected with the two vertical supports; one end of the second clamping piece, which is far away from the tested sample piece, penetrates through the bottom of the temperature control box and then is fixedly connected with the base.
In some embodiments, the tensile testing device employs an angle measuring device, and the angle measuring device is arranged on the bracket and is used for measuring the rotation angle of the supporting shaft in the process that the sample to be tested is stretched; the angle measuring device adopts an encoder, and the encoder is connected with the supporting shaft.
In some embodiments, the tensile testing device employs a camera disposed toward the sample to be tested for recording changes in the process of stretching the sample to be tested.
In some embodiments, the sample to be tested is provided with a gauge length, and the shooting device is used for recording the change of the gauge length in the process of stretching the sample to be tested.
In some embodiments, at least two marking lines are arranged on the sample piece to be tested, and a gauge length is formed between every two adjacent marking lines.
In some embodiments, a limiting component for limiting the rotation of the supporting shaft is further included.
In some embodiments, the limiting assembly includes a winding wheel, a pulling wire and a driving device, the driving device is mounted on the bracket and used for driving the winding wheel to rotate, one end of the pulling wire is connected to the winding wheel, and the other end of the pulling wire is connected to the balance arm.
Compared with the prior art, the tensile creep testing device for the membrane provided by the invention has the following advantages and positive effects:
1. according to the tensile creep testing device for the diaphragm, the balance weight realizes stable tension on the sample piece to be tested through the balance arm and the sample fixing assembly, wherein the tension applied to the sample to be tested by the balance weight is increased in a multiple manner by utilizing the lever principle, so that the large tension test on the sample to be tested can be realized without adopting a large-volume and large-weight balance weight, and the balance weight is small in weight, small in volume and low in cost; because the weight of the counterweight is small, the impact of the sample piece to be tested due to accidental factor fracture under large tension is small, and the experimental risk coefficient is small; in addition, because counter weight quality, small, consequently need not to improve the whole volume of testing arrangement and come the counter weight of the big mass of adaptation, further reduction testing arrangement volume, reduce cost.
2. In the tensile creep testing device for the diaphragm, the tensile testing device adopts two modes for measurement, one mode is that the tensile length of a sample piece to be tested is calculated by reading the corner of an encoder connected with a supporting shaft, and then the corresponding strain is calculated; the other method is that a shooting device is adopted to shoot and measure the gauge length on the sample piece to be tested, so as to calculate the corresponding strain; both methods can reach very high measurement accuracy, and the application provides a plurality of test modes for technicians.
3. According to the tensile creep testing device for the membrane, provided by the invention, the sample piece to be tested is placed in the temperature control box for testing, and the temperature control box is used for simulating the real use environment of the sample piece to be tested, so that the testing accuracy is favorably improved.
Drawings
FIG. 1 is a schematic perspective view of a first apparatus for testing tensile creep of a membrane according to the present invention;
FIG. 2 is a schematic perspective view of a tensile creep testing apparatus for a membrane according to the present invention;
FIG. 3 is a side view of a tensile creep test apparatus for a membrane provided by the present invention;
fig. 4 is a schematic structural view of the balance arm according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
Referring to fig. 1-4, the present invention provides an embodiment of a tensile creep testing apparatus for a membrane, the testing apparatus includes a bracket 1, a supporting shaft 10, a tensile force application component, a sample fixing component and a tensile testing apparatus; the stretching force application component is rotatably arranged on the bracket 1 through a support shaft 10; the stretching force application assembly comprises a balance arm 6 and a counterweight 2, the balance arm 6 is arranged and installed perpendicular to the axial direction of the support shaft 10, and the counterweight 2 with variable weight is hung on one end of the balance arm 6, which is far away from one side of the support shaft 10; the sample fixing component is connected with the stretching force application component through a support shaft 10, the counterweight 2 hung on the stretching force application component stretches the sample 14 to be tested fixed on the sample fixing component, and further the deformation of the sample 14 to be tested in the stretching process is tested through the stretching test device.
According to the tensile creep testing device for the diaphragm, the balance weight realizes stable tension on the sample piece to be tested through the balance arm and the sample fixing assembly, wherein the tension applied to the sample to be tested by the balance weight is increased in a multiple manner by utilizing the lever principle, so that the large tension test on the sample to be tested can be realized without adopting a large-volume and large-weight balance weight, and the balance weight is small in weight, small in volume and low in cost; because the weight of the counterweight is small, the impact of the sample piece to be tested due to accidental factor fracture under large tension is small, and the experimental risk coefficient is small; in addition, because counter weight quality, small, consequently need not to improve the whole volume of testing arrangement and come the counter weight of the big mass of adaptation, further reduction testing arrangement volume, reduce cost.
In this embodiment, the bracket 1 includes a base 102 and two vertical brackets 101 arranged on the base 102, the upper ends of the two vertical brackets 101 are connected with a transverse bracket 104, and a reinforcing member 103 is arranged at the joint of the vertical bracket 101 and the base 102; two ends of the supporting shaft 10 are respectively connected to the two vertical brackets 101, and the transverse bracket 104, the base 102 and the supporting shaft 10 are arranged in parallel; further, both ends of the support shaft 10 are respectively mounted on the vertical brackets 101 through bearings 1001 so that the support shaft 10 can freely rotate with respect to the bracket 1. The support 1 provided by this embodiment has a simple and stable structure, and the specific structure of the support in other embodiments can be adjusted according to specific situations, which is not limited herein.
In the present embodiment, referring to fig. 4, the balance arm 6 includes a circular arc segment 601 and a connection arm 602 disposed in a radial direction of the circular arc segment 601; one end of the connecting arm 602 is connected with the arc segment 601, the other end is connected with 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 at one end of the arc segment 601.
The circular arc section 601 is arranged coaxially with the support shaft 10, that is, the center of the circular arc section 601 is located in the axial direction of the support shaft 10.
Wherein, the other end of the connecting arm 602 is provided with a first connecting disc 603, and the first connecting disc 603 is coaxially arranged with the arc section 601; the other end of the connecting arm 602 is coaxially fitted over the supporting shaft 10 via a first connecting plate 603, and preferably the first connecting plate 603 is rotatable relative to the supporting shaft 10 to adjust the position of the balance arm 6. Further, the first connecting disc 603 and the support shaft 10 are fixedly connected through a first connecting piece 604, preferably, the first connecting piece 604 is a screw, threaded holes are formed in the first supporting disc 603 and the support shaft 10, and the screw is screwed in the threaded hole to realize the fixed connection between the first connecting disc 603 and the support shaft 10; of course, in other embodiments, the connection between the first connecting plate 603 and the supporting shaft 10 can be realized by other structures, such as a positioning pin, and the like, which is not limited herein.
Wherein, preferred circular arc section 601, linking arm 602 and first flange 603 integrated into one piece design, be the fretwork setting on further circular arc section 601, the linking arm 602, under the circumstances of guaranteeing 6 rigidity of balance arm, lighten the weight of balance arm as far as possible.
In this embodiment, the counterweight 2 is suspended on the outer ring of the circular arc 601 by the pulling rope 5, and the sample fixing member holding the sample to be tested 14 is connected to the outer ring of the first connecting plate 603 by the pulling rope 19. According to the lever principle, the central point of the support shaft 10 is a fulcrum of the lever, the radius R1 of the arc section 601 is a power arm L1, the radius R2 of the first connecting disc 603 is a power arm L2, the gravity of the counterweight 2 is a force F1 exerted on the power arm L1, the tensile force exerted by the pattern fixing component on the sample to be tested is a force F2 on the power arm L2, and according to the lever principle, F1 & L1 & F2 & L2, the tensile force exerted on the sample to be tested can be calculated according to the weight of the counterweight 2, the radius R1 of the arc section 601 and the radius R2 of the first connecting disc 603. For example, in the embodiment, the radius R1 of the circular arc segment 601 is 500mm, the radius R2 of the first connecting disc 603 is 50mm, and at this time, the pulling force exerted on the sample to be tested is ten times of the gravity of the counterweight 2, for example, if the gravity of the counterweight 2 is 10N, the pulling force exerted on the sample to be tested is 100N.
Of course, in other embodiments, the pattern fixing component holding the sample to be tested 14 is hung on the outer ring of the supporting shaft 10 through the pulling rope 19, and at this time, the power arm L2 is the radius of the supporting shaft 10, or the pattern fixing component holding the sample to be tested 14 may also be connected to other structures coaxially disposed on the supporting shaft through the pulling rope, which is not limited herein, and can be adjusted according to specific situations.
In the present exemplary embodiment, the pull cord 5 is connected to the counterweight 2 via an eye bolt 3, wherein the counterweight 2 can be replaced as a function of the tension applied to the test piece to be tested.
In the present embodiment, a weight 11 is further disposed on the supporting shaft 10, and the weight 11 is used for offsetting the moment generated by the weight of the balance arm 6 to the supporting shaft 10. Further, balancing weight 11 is including weight and weight connecting rod, and weight connecting rod one end is connected with the weight, and the other end perpendicular to support shaft 10's axial is connected to on the support shaft 10.
Wherein, the one end and the weight threaded connection of weight connecting rod to can adjust the distance between weight and the back shaft 10, so that balanced arm rotates can both balance statically to the optional position. Of course, in other embodiments, the adjustable manner between the weight connecting rod and the weight is not limited to the above, and can be set according to specific situations.
The other end of the weight connecting arm is provided with a second connecting disc 1101, and the second connecting disc 1101 is coaxially sleeved on the support shaft 10 and can rotate and adjust relative to the support shaft 10; further, the second connecting disc 1101 is fixedly connected with the support shaft 10 through a second connecting piece 1102, preferably, the second connecting piece 1102 is a screw, threaded holes are formed in the second connecting disc 1101 and the support shaft 10, and the screw is screwed in the threaded holes to realize the fixed connection between the second connecting disc 11013 and the support shaft 10; of course, in other embodiments, the connection manner between the second connection plate 1101 and the support shaft 10 can be realized by other structures, such as a positioning pin and the like, which is not limited herein.
In this embodiment, the sample fixing assembly includes a first clamping member 13 and a second clamping member 18, and the sample to be tested 14 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 disc 603 on the supporting shaft 10 through a pull rope 19, and the other end clamps one side of the sample piece to be tested; one end of the second clamping part 18 clamps the other opposite side of the sample to be tested 14, and the other end is fixed on the base 102 of the bracket 1 through a supporting rod, so that the second clamping part 18 is fixedly arranged relative to the bracket 1; the clamping and stretching direction of the first clamping piece 13 and the second clamping piece 18 relative to the sample piece 14 to be tested is perpendicular to the axial direction of the supporting shaft 10, so that the testing accuracy is ensured.
The first clamping piece 13 and the second clamping piece 18 have the same structure and are both clamping blocks, each clamping block is provided with a clamping port, two opposite sides of the sample piece 14 to be tested are respectively clamped in the two clamping ports, and the two clamping ports are fixedly connected through connecting pieces 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 function may be used, which is not limited herein.
In this embodiment, the tensile creep testing apparatus for a membrane further includes a temperature control box 15, and the sample piece 14 to be tested is placed in the temperature control box 15 to simulate the use environment of the sample piece 14 to be tested, so as to improve the testing accuracy.
Specifically, a control device, a temperature sensor and a heating device are arranged in the temperature control box 15, and the temperature sensor and the heating device are respectively connected with the control device and are used for controlling the temperature condition in the temperature control box 15; the control device obtains temperature information in the temperature control box 15 through the temperature sensor, and when the temperature information does not meet a preset value, the control device controls the heating device to heat and adjust, so that the temperature in the temperature control box 15 meets a preset value temperature value.
Further, the temperature control box 15 may also be provided with a humidity sensor and a humidifying device, which are used for controlling the humidity condition in the temperature control box 15; the control device obtains humidity information in the temperature control box 15 through the humidity sensor, and when the humidity information does not meet a preset value, the control device controls the humidifying device to perform humidifying adjustment so that the humidity in the temperature control box 15 meets a preset humidity value.
Furthermore, the heating device can specifically adopt devices such as heating wires, the humidifying device can adopt devices such as spraying, the devices are not limited, and the devices can be adjusted according to specific conditions.
In the embodiment, the first clamping piece 13, the second clamping piece 18 and the sample piece 14 to be tested are all positioned in the temperature control box 15, and the pull rope 19 penetrates through the top of the temperature control box 15 through the movable guide assembly 12 to be connected with the first clamping piece 13; thereby the setting through removal subassembly 13 in this embodiment guarantees to apply the stability at the tensile of the sample 14 that awaits measuring, makes it stabilize and stretch along the axial direction of perpendicular to back shaft 10, prevents that its horizontal direction from rocking to the measuring precision has been guaranteed.
Further, the moving guide assembly 12 comprises a sliding block 1201 and a guide structure 1202, the guide structure 1202 is arranged on the temperature control box 15, the guide structure 1202 is provided with a sliding hole, and the extending direction of the sliding hole is perpendicular to the axial direction of the support shaft 10; a through hole is formed in the top of the temperature control box 15 corresponding to the sliding hole, and the through hole is coaxially communicated with the sliding hole; the upper end of the sliding block 1201 is connected with a pull rope 19 through an eye bolt, the lower end of the sliding block 1201 is inserted into a sliding hole and penetrates through the through hole to extend into the temperature control box 15 to be connected with the first clamping piece 13, and the sliding block 1201 can move along the sliding hole in the direction perpendicular to the supporting shaft 10.
Further, the sliding block 1201 is of a strip-shaped structure, the cross section of the sliding block is rectangular, the cross section of the corresponding sliding hole is rectangular, and when the sliding block 1201 is inserted into the sliding hole, circumferential limiting can be achieved to prevent the sliding block 1201 from rotating relative to the sliding hole, so that the measurement accuracy is further guaranteed; certainly, the circumferential limiting manner of the sliding block 1201 and the sliding hole is not limited to the above, and the cross sections of the sliding block 1201 and the sliding hole may be both in a matched polygon shape, or the cross sections of the sliding block and the sliding hole are different, for example, the cross section of the sliding block 1201 is a triangle, the cross section of the sliding hole is a rectangle, and the like, which are not limited herein, and can be adjusted according to specific situations.
In this embodiment, the front of the temperature control box 15 is provided with a door so as to facilitate the disassembly and assembly of the sample to be tested; an observation window 1501 is arranged on the position, corresponding to the sample piece 14 to be tested, of the door so as to facilitate observation of the sample to be tested in the test process. The observation window can be realized by the structure of the glass window, and is not limited herein.
Further, the temperature control box 15 is located between the two vertical supports 101, and the left side and the right side of the temperature control box 15 are respectively connected to the two vertical supports 101 to be fixed.
In this embodiment, the tensile testing apparatus includes an angle measuring apparatus, the angle measuring apparatus is used for measuring the rotation angle of the supporting shaft 10 during the testing process, and the corresponding arc length can be calculated according to the rotation angle of the supporting shaft 10 and the diameter of the supporting shaft, and the arc length is the tensile length of the sample to be tested, so that the creep performance can be calculated accordingly.
Further, the angle measuring device adopts the encoder 4, and the encoder 4 is connected with the supporting shaft 10 and is used for measuring the rotation angle of the supporting shaft constantly. Of course, other angle measuring devices may be used in other embodiments, and are not limited herein.
In this embodiment, the tensile testing apparatus further includes a shooting device 16, a shooting direction of the shooting device 16 is opposite to the sample piece 14 to be tested, the shooting device 16 observes the sample piece 14 to be tested by penetrating the observation window, and the shooting device 16 is used for recording a change of a preset gauge length on the sample piece 14 during the tensile process.
Two marking lines are arranged on the test sample 14, and a gauge length is formed between adjacent marking lines 1302. The gauge length between the two marked lines changes during the stretching process of the test sample 14 until the set stretching force value or a certain displacement value or the stretching fracture is terminated.
The test sample 14 is an industrial camera, such as a laser extensometer, and the like, and is not limited herein and can be adjusted according to specific situations.
In the embodiment, the encoder and the industrial camera are used as the tensile testing device, so that very high measurement precision can be achieved; the encoder precision can reach 0.005 degrees, the radius of the supporting shaft 10 is 50mm, and the measurement precision of the tensile length of the test piece is 50 x 0.005 x 3.14159/180-0.00436 mm; the industrial camera is 500 ten thousand pixels, the vertical strain precision measurement can reach 1/2500 ═ 0.0004, and the precision is higher if the industrial camera with higher pixel points is selected.
Of course, in other embodiments, only one of the angle measuring device and the photographing device 16 may be selected as the tensile testing device, which is not limited herein and may be selected according to specific situations; alternatively, the tensile testing apparatus may also be in other forms of structures in other embodiments, and is not limited herein.
In this embodiment, the tensile creep testing apparatus for a membrane further includes a limiting component for limiting the rotation of the supporting shaft 10 before testing, so as to avoid the tensile stress on the sample to be tested 14 before testing and during the preparation process, thereby affecting the subsequent testing structure.
Specifically, the limiting assembly comprises a winding wheel 8, a stay wire 7 and a driving device 9, the driving device is mounted on a transverse support 104 at the top of the support 1 and connected with the winding wheel 8 for driving the winding wheel 8 to rotate, one end of the stay wire 7 is wound on the winding wheel 8, and the other end of the stay wire is connected with the balance arm 6. The winding wheel 8 is driven by the driving device 9 to rotate, so that the winding or sending of the stay wire can be realized, and the balance arm 6 is lifted or loosened. Further, the driving device 9 may specifically adopt a driving device such as a speed reduction motor, and is not limited herein.
The limiting component provided by the embodiment is simple in structure, convenient and stable to operate, and of course, limiting components of other structures can be selected in other embodiments, so that the limitation is not limited, and the corresponding adjustment can be performed according to specific situations.
The working principle of the device for testing tensile creep of a membrane provided by the invention is explained as follows:
firstly, the distance between a weight on a balancing weight 11 and a supporting shaft 10 is adjusted to balance the weight moment of the balancing arm, so that the balancing arm 6 can be balanced and static when rotating to any position; then, selecting the middle counterweight 2 hung on the balance arm 10 according to the magnitude of the pulling force required to be applied, for example, when the pulling force required to be applied is 100N, selecting the counterweight 2 of 10N;
then, the winding wheel 8 is driven to rotate by starting the driving device 9 (a speed reducing motor), and the winding wheel 8 rotates to pull the pull wire 7 to lift the balance arm 6; the door of the temperature-controlled cabinet 15 is opened, and the sample 14 to be measured is mounted between the first holding member 13 and the second holding member 18. After the sample to be tested is installed, the driving device 9 is started to reversely rotate the winding wheel 8, the pull wire 7 is gradually loosened until the pull wire is completely loosened, and at the moment, the 10-time weight tension of the counterweight is added on the sample to be tested.
And then, monitoring the rotation angle of the encoder in real time or continuously shooting the test piece through the observation window 1501 by using the shooting device 16, so as to calculate the tensile change of the test piece to be detected at any moment, wherein the calculation method of the creep property is calculated according to the national standard GB/T11546. Based on this application provides the embodiment mode and can realize the pulling force effect of big weight through the weight piece of small-mass, simple structure has reduced the device volume greatly, reduces the cost, has still improved measurement accuracy simultaneously.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (16)
1. The tensile creep testing device of the membrane is characterized by comprising a bracket, a supporting shaft, a tensile force application assembly, a sample fixing assembly and a tensile testing device;
the stretching force application assembly is rotatably arranged on the bracket through the supporting shaft;
the stretching force application assembly comprises a balance arm and a counterweight, the balance arm is perpendicular to the axial direction of the support shaft and is arranged, and the counterweight with variable weight is hung on one end of the balance arm away from one side of the support shaft;
the sample fixing assembly is connected with the stretching force application assembly through the support shaft, the counterweight hung on the stretching force application assembly stretches a sample piece to be tested fixed on the sample fixing assembly, and further the deformation of the sample piece to be tested in the stretching process is tested through the stretching test device.
2. The apparatus for tensile creep testing of a membrane according to claim 1, wherein the balance arm comprises a circular arc section and a connecting arm disposed along a radial direction of the circular arc section; one end of the connecting arm is connected with the arc section, the other end of the connecting arm is connected with the supporting shaft, and the radial direction of the arc section is perpendicular to the axial direction of the supporting shaft; the counterweight is hung at one end of the arc section.
3. The apparatus for tensile creep testing of a membrane according to claim 2 wherein the circular arc segment is disposed coaxially with the support shaft.
4. The apparatus for testing tensile creep of a membrane according to claim 2 or 3, wherein a first connecting plate is disposed at the other end of the connecting arm, the first connecting plate is coaxially sleeved on the supporting shaft, and the first connecting plate is fixedly connected to the supporting shaft by a first connecting member.
5. The apparatus for tensile creep test of a membrane according to claim 1, wherein a weight is further disposed on the supporting shaft, and the weight is used for offsetting the moment generated by the weight of the balance arm to the supporting shaft.
6. The apparatus for testing tensile creep of a diaphragm according to claim 4, wherein the weight block comprises a weight and a weight connecting rod, one end of the weight connecting rod is connected with the weight by screw thread, and the other end of the weight connecting rod is connected to the supporting shaft perpendicular to the axial direction of the supporting shaft;
the other end of weight linking arm is provided with the second connection pad, the coaxial cover of second connection pad is established on the back shaft, just the second connection pad with still through second connecting piece fixed connection between the back shaft.
7. The membrane tensile creep test device of claim 1, wherein the sample fixing assembly comprises a first clamping member and a second clamping member, one end of the first clamping member is connected with the supporting shaft, and the other end of the first clamping member clamps one side of the sample to be tested; one end of the second clamping piece clamps the other side of the sample piece to be tested, and the other end of the second clamping piece is fixed on the bracket; and the clamping and stretching directions of the first clamping piece and the second clamping piece to the sample piece to be tested are perpendicular to the axial direction of the supporting shaft.
8. The apparatus for tensile creep testing of a membrane according to claim 7 further comprising a temperature controlled box mounted on said frame; the first clamping piece, the second clamping piece and the sample piece to be tested are positioned in the temperature control box, and the first clamping piece is connected with the supporting shaft through a pull rope penetrating through the temperature control box.
9. The membrane tensile creep testing device according to claim 8, wherein a control device, a temperature sensor, a heating device, a humidity sensor and a humidifying device are arranged in the temperature control box, and the temperature sensor, the heating device, the humidity sensor and the humidifying device are respectively connected with the control device;
the control device acquires temperature information in the temperature control box through the temperature sensor, and when the temperature information does not meet a preset value, the control device controls the heating device to heat and adjust so that the temperature in the temperature control box meets a preset temperature value;
the control device acquires humidity information in the temperature control box through the humidity sensor, and when the humidity information does not meet a preset value, the control device controls the humidifying device to perform humidification adjustment so that the humidity in the temperature control box meets a preset humidity value.
10. The apparatus for tensile creep testing of a membrane according to claim 8, wherein the pull cord is threaded through the temperature control box by a movement guide assembly;
the movable guide assembly comprises a sliding block and a guide structure arranged on the temperature control box, a sliding hole is formed in the guide structure, the sliding block penetrates through the sliding hole and is limited in the circumferential direction, and the sliding block can move along the sliding hole in the direction perpendicular to the support shaft; one end of the sliding block is connected with the first clamping piece, and the other end of the sliding block is connected with the pull rope;
the sliding block and the cross section of the sliding hole are in matched rectangles, and the sliding block is inserted into the sliding hole to realize circumferential limiting.
11. The apparatus for testing tensile creep of membrane according to claim 8, wherein an observation window is provided on the temperature control box corresponding to the sample to be tested.
12. The tensile creep test apparatus of claim 8, wherein the bracket comprises a base, two vertical brackets disposed on the base, and a transverse bracket connecting the two vertical brackets; two ends of the supporting shaft are respectively connected to the two vertical supports, and the transverse support, the base and the supporting shaft are arranged in parallel; the temperature control box is positioned below the transverse support, and two sides of the temperature control box are respectively connected with the two vertical supports; one end of the second clamping piece, which is far away from the tested sample piece, penetrates through the bottom of the temperature control box and then is fixedly connected with the base.
13. The membrane tensile creep testing device of claim 1, wherein the tensile testing device employs an angle measuring device, and the angle measuring device is disposed on the bracket and is used for measuring the rotation angle of the supporting shaft during the process of stretching the sample to be tested; the angle measuring device adopts an encoder, and the encoder is connected with the supporting shaft.
14. The apparatus for tensile creep test of a membrane according to claim 1 or 11, wherein the tensile testing apparatus employs a camera disposed toward the sample to be tested for recording changes in the process of stretching the sample to be tested.
15. The apparatus for testing tensile creep of membrane according to claim 14, wherein at least two mark lines are provided on the sample to be tested, and a gauge length is formed between adjacent mark lines, and the camera is used for recording the change of the gauge length during the process of stretching the sample to be tested.
16. The apparatus for tensile creep testing of a membrane according to claim 1 further comprising a limiting assembly for limiting rotation of said support shaft; the limiting assembly comprises a winding wheel, a pull wire and a driving device, the driving device is installed on the support and used for driving the winding wheel to rotate, one end of the pull wire is connected to the winding wheel, and the other end of the pull wire is connected with the balance arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011367997.6A CN112432860A (en) | 2020-11-27 | 2020-11-27 | Tensile creep testing arrangement of diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011367997.6A CN112432860A (en) | 2020-11-27 | 2020-11-27 | Tensile creep testing arrangement of diaphragm |
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| CN112432860A true CN112432860A (en) | 2021-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901443A (en) * | 2022-11-01 | 2023-04-04 | 哈尔滨工业大学 | Space tension film experiment device and ground simulation experiment method |
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2020
- 2020-11-27 CN CN202011367997.6A patent/CN112432860A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901443A (en) * | 2022-11-01 | 2023-04-04 | 哈尔滨工业大学 | Space tension film experiment device and ground simulation experiment method |
| CN115901443B (en) * | 2022-11-01 | 2023-08-11 | 哈尔滨工业大学 | Space stretching film experimental device and ground simulation experimental method |
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