CN107727280B - Single-drive biaxial tension test device and manufacturing method of flexible stress sensor - Google Patents

Single-drive biaxial tension test device and manufacturing method of flexible stress sensor Download PDF

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Publication number
CN107727280B
CN107727280B CN201710749169.0A CN201710749169A CN107727280B CN 107727280 B CN107727280 B CN 107727280B CN 201710749169 A CN201710749169 A CN 201710749169A CN 107727280 B CN107727280 B CN 107727280B
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China
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moving
lead screw
thread
driving
biaxial tension
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CN107727280A (en
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丁建宁
徐修祝
袁宁一
程广贵
张忠强
郭立强
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Jiangsu University
Changzhou University
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Jiangsu University
Changzhou University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/20Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/14Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators

Abstract

The invention belongs to the technical field of sensor manufacturing, and particularly relates to a single-drive biaxial tension test device and a manufacturing method of a flexible stress sensor. The test device comprises: the flexible stress sensor comprises a first lead screw, a second lead screw, moving parts, connecting pieces, a limiting device and a driving device, wherein the first lead screw and the second lead screw are arranged on the limiting device, one lead screw is driven by the driving device to rotate and drives the other lead screw to rotate through gear transmission, then the moving parts which are screwed on the two lead screws are driven to move oppositely or oppositely, the connecting pieces fixed on the moving parts clamp a tensile sample to perform tensile action, and a manufacturing method for the flexible stress sensor by using the testing device is provided. The invention has the beneficial effects that: the testing device has the advantages of simple structure, large space for installing the tensile sample, convenient operation and saving of another driving device, so that the cost is relatively low and the universality is high; and the control of an automatic system is convenient to realize.

Description

Single-drive biaxial tension test device and manufacturing method of flexible stress sensor
Technical Field
The invention belongs to the technical field of sensor manufacturing, and particularly relates to a single-drive biaxial tension test device and a manufacturing method of a flexible stress sensor.
Background
At present, the flexible stress sensor has the characteristics of flexibility and elasticity, can be attached to the skin of a human body, and has potential application in the fields of robots, medical health monitoring equipment and the like. At present, flexible stress sensors are mostly manufactured based on flexible base materials, such as hydrogenated styrene-butadiene block copolymer (SEBS) or Polydimethylsiloxane (PDMS) and the like, which are flexible elastic base materials, and then conductive materials such as carbon nanotubes or graphene are coated on the base materials, in order to obtain flexible stress sensors for measuring larger tensile strain, the flexible base materials need to be pre-stretched during manufacturing, and then the conductive materials are coated on the surface, so that the manufactured flexible stress sensors can measure more than 10 times of tensile strain.
The existing flexible stress sensor with large tensile strain is generally manufactured by adopting a one-way pre-stretching method, and the phenomenon of necking is generated in the process of stretching a base material, so that the problem of non-ideal detection performance of the manufactured flexible stress sensor is caused due to uneven stretching. For this purpose, a simultaneous biaxial stretching test apparatus is required.
At present, the biaxial tension test device has two realization modes: single drive mode and dual or multiple drive mode. The biaxial tension test bed adopting single drive input usually uses gears and ropes as transmission modes, for example, the Chinese invention patent "biaxial tension test device for testing the performance of metal plates", application no: 201210194623.8, the test device is composed of an upper connection structure, a lower connection structure, a proportion adjusting mechanism, a clamp sliding block mechanism and a connecting rod, and has the problems of complex operation and narrow installation sample space. The method is realized by adopting a dual-drive or multi-drive mode, namely independent drive devices are respectively arranged in the transverse direction and the longitudinal direction, for example, the invention patent of China, "a bidirectional tension and compression mechanical testing machine and a bidirectional tension and compression mechanical testing method", application numbers: 201611006988.8, the cross that mainly adopts 4 groups lead screw modules arranges, all has a servo motor to drive on every group lead screw module and stretches, leads to whole tensile testing machine structure complicacy, and the cost is higher moreover.
Disclosure of Invention
The invention aims to solve the problems of complex operation and narrow installation sample space of a single-drive biaxial tension test device and the problems of complex structure and high cost of a multi-drive biaxial tension test device in the prior art, provides a single-drive biaxial tension test device which has simple structure, large installation sample space, convenient operation and relatively low cost, and provides a manufacturing method of a flexible stress sensor by using the test device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a single drive biaxial tension test apparatus comprising: the first lead screw comprises a first thread, a second thread and a first bevel gear arranged between the first thread and the second thread, and the rotating directions of the first thread and the second thread are opposite; the second screw rod comprises a third thread, a fourth thread and a second bevel gear which is arranged between the third thread and the fourth thread and is in transmission connection with the first bevel gear, the rotating directions of the third thread and the fourth thread are opposite, and the first screw rod and the second screw rod are mutually vertical; a moving member including a first moving member threadedly connected to the first thread, a second moving member threadedly connected to the second thread, a third moving member threadedly connected to the third thread, and a fourth moving member threadedly connected to the fourth thread; a connector comprising a first connector to couple a tensile specimen to the first moving member, a second connector to couple a tensile specimen to the second moving member, a third connector to couple a tensile specimen to the third moving member, and a fourth connector to couple a tensile specimen to the fourth moving member; the first lead screw and the second lead screw are arranged on the limiting device and do rotary motion; and the driving device is used for driving the first lead screw or the second lead screw and driving the other lead screw to rotate through gear transmission, so that the first moving piece and the second moving piece, and the third moving piece and the fourth moving piece are driven to move oppositely or oppositely.
Furthermore, the limiting device comprises a base and four fixing plates fixed on the base, a bearing is mounted on each fixing plate, and two ends of the first lead screw and two ends of the second lead screw are respectively fixed on the bearings. The two ends of the first lead screw are respectively fixed on the two bearings, so that the first lead screw is limited to rotate on the bearings, the two ends of the second lead screw are respectively fixed on the two bearings, the second lead screw is limited to rotate on the bearings, and the four bearings are respectively fixed on the four fixing plates.
Further, the test device further comprises: a first guide bar slidably coupled to the first moving member and the second moving member, and a second guide bar slidably coupled to the third moving member and the fourth moving member. Preferably, the first guide rod is parallel to the first lead screw, and the second guide rod is parallel to the second lead screw. The first moving part and the second moving part are connected on the first guide rod in a sliding way, the first guide rod plays a role in guiding and supporting, so that the first moving member and the second moving member move more smoothly with the rotational movement of the first lead screw, and also, the third moving part and the fourth moving part are connected on the second guide rod in a sliding way, the second guide rod plays a role in guiding and supporting, so that the third moving member and the fourth moving member move more smoothly with the rotational movement of the second lead screw, preferably, the first guide rod and the second guide rod are respectively parallel to the first lead screw and the second lead screw, so the structure is symmetrical and simple, and the first guide rod and the second guide rod further play a better role in guiding and supporting.
Further, a force sensor or/and a displacement sensor is/are respectively arranged between the first moving part and the second moving part, and between the third moving part and the fourth moving part. The force sensor and the displacement sensor between the first moving part and the second moving part, and the force sensor and the displacement sensor between the third moving part and the fourth moving part can respectively detect the values of force and displacement between the first moving part and the second moving part and between the third moving part and the fourth moving part, and detect the force applied to the tensile sample and the displacement condition of the tensile sample in real time.
Furthermore, a rotary encoder for detecting the rotation number of turns of the screw shaft is arranged on the first screw rod or the second screw rod. The encoder can detect out first lead screw or the second lead screw axle rotates the number of turns, is convenient for can learn the number of turns of rotating according to the required tensile length of tensile sample directly perceivedly, has improved tensile control's precision.
Preferably, the driving device is a servo motor. The rotation speed of the servo motor is controlled by an input signal, the servo motor can quickly respond, the position precision is very accurate, and the servo motor has the characteristics of small electromechanical time constant, high linearity and the like in an automatic control system, can convert a voltage signal into torque and rotation speed to drive a control object, and is convenient for realizing the automatic control system.
Further, the test device further comprises: the device comprises a control module, an analysis module and a display module, wherein the control module is in signal connection with the force sensor, the displacement sensor, the encoder and the driving device, and the analysis module is in signal connection with the control module, the force sensor, the displacement sensor and the encoder. The control module controls the driving device to rotate according to numerical information provided by the force sensor, the displacement sensor and the encoder, further controls the driving device to rotate in the forward direction or the reverse direction, the first moving part and the second moving part are driven to move in the opposite direction or the reverse direction by the forward rotation or the reverse rotation of the driving device, the third moving part and the fourth moving part are driven to move in the opposite direction or the reverse direction, the analysis module analyzes the numerical information of the force sensor, the displacement sensor and the encoder, analyzes control information of the control module, applies force to draw experimental curves related to displacement, force and deformation, force and time and the like, and the display module displays a tested result and an analyzed result in real time.
Furthermore, a protective cover is arranged on the periphery of the testing device. The protection casing aim at prevents the pop-up of tensile sample etc. in the test process to play the guard action to surrounding operator.
Further, the method for manufacturing the flexible stress sensor by using the testing device comprises the following steps:
firstly, starting the driving device to drive the first lead screw or the second lead screw, and driving the other lead screw to rotate through bevel gear transmission, so as to drive the first moving part and the second moving part, and the third moving part and the fourth moving part to move oppositely, and move to a distance between the first moving part and the second moving part and a distance between the third moving part and the fourth moving part, wherein a flexible elastic base material can be accommodated between the two distances, so that the operation of the driving device can be stopped;
fixing flexible elastic base materials to the first connecting piece, the second connecting piece, the third connecting piece and the fourth connecting piece respectively;
thirdly, the driving device is started again, so that the first moving piece and the second moving piece as well as the third moving piece and the fourth moving piece move oppositely, and the driving device stops running when the first moving piece and the second moving piece move to a preset distance;
coating a conductive material in the middle of the elastic base material, and curing the conductive material;
and fifthly, repeating the first step, taking down the elastic base material, and finishing the manufacture of the flexible stress sensor.
In summary, the manufacturing method of the single-drive biaxial tension test device and the flexible stress sensor of the invention has the following beneficial effects:
1. the two lead screws with threads in different rotation directions are vertically arranged and are in transmission connection through the group of bevel gears, and the simultaneous opposite movement or opposite movement in two directions can be realized only by one driving device;
2. the force sensor, the displacement sensor, the encoder, the servo motor and the like are arranged, so that the control of an automatic system is convenient to realize, and the subsequent operation is more convenient;
3. utilize this test device to stretch the elastic matrix material to certain distance, then coating conducting material on the elastic matrix material, can accomplish the preparation of flexible stress sensor, this test device preparation biaxial stretching flexible stress sensor is very convenient, and biaxial stretching makes the plane atress even easily, and the flexible stress sensor precision of tensile flexible elastic matrix material is higher like this.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a perspective view of a single drive biaxial tension test apparatus of the present invention;
FIG. 2 is an expanded view of the single drive biaxial tension test apparatus of the present invention;
fig. 3 is a schematic diagram of the fabrication of a flexible stress sensor of the present invention.
Wherein: 1. a first lead screw; 11. a first thread; 12. a second thread; 13. a first helical gear; 2. a second lead screw; 21. a third thread; 22. a fourth thread; 23. a second helical gear; 3. a moving member; 31 a first moving member; 32. a second moving member; 33. a third moving member; 34. a fourth moving member; 4. a connecting member; 41. a first connecting member; 42. a second connecting member; 43. a third connecting member; 44. a fourth connecting member; 5. a restriction device; 51. a base; 52. a fixing plate; 53. a bearing; 6. a drive device; 7. a first guide bar; 8. a second guide bar; 91. a force sensor; 92. a displacement sensor; 93. an encoder; 100. a flexible stress sensor; 101. an elastomeric matrix material; 102. a conductive material.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1 to 2, the single-drive biaxial tension test apparatus of the present embodiment includes: first lead screw 1, second lead screw 2, moving member 3, connecting piece 4, restraining device 5 and drive arrangement 6 specifically as follows:
the first lead screw 1 comprises a first thread 11, a second thread 12 and a first bevel gear 13 arranged between the first thread 11 and the second thread 12, wherein the rotation directions of the first thread 11 and the second thread 12 are opposite.
The second lead screw 2 comprises a third thread 21, a fourth thread 22 and a second bevel gear 23 which is arranged between the third thread 21 and the fourth thread 22 and is in transmission connection with the first bevel gear 13, the rotating directions of the third thread 21 and the fourth thread 22 are opposite, and the first lead screw 1 and the second lead screw 2 are perpendicular to each other. The helical gear can be a worm gear NEGTS series of Misimi corporation.
The moving member 3 comprises a first moving member 31 threadedly coupled to the first thread 11, a second moving member 32 threadedly coupled to the second thread 12, a third moving member 33 threadedly coupled to the third thread 21, and a fourth moving member 34 threadedly coupled to the fourth thread 22.
The linkage 4 comprises a first linkage 41 connecting the tensile specimen (i.e. the flexible stress sensor 100 in this embodiment) to the first moving part 31, a second linkage 42 connecting the tensile specimen to the second moving part 32, a third linkage 43 connecting the tensile specimen to the third moving part 33 and a fourth linkage 44 connecting the tensile specimen to the fourth moving part 34.
The limiting device 5 is provided with a first lead screw 1 and a second lead screw 2 which are arranged on the limiting device 5 and rotate; preferably, the limiting device 5 comprises a base 51 and four fixing plates 52 fixed on the base 51 (i.e. the whole test device is arranged on the base 51), each fixing plate 52 is provided with a bearing 53, and the two ends of the first lead screw 1 and the second lead screw 2 are respectively fixed on the bearings 53. The two ends of the first lead screw 1 are respectively fixed on the two bearings 53, so that the first lead screw 1 rotates on the bearings 53, the two ends of the second lead screw 2 are respectively fixed on the bearings 53, the second lead screw 2 is limited to rotate on the bearings 53, the four bearings 53 are respectively fixed on the four fixing plates 52, and the first lead screw 1 and the second lead screw 2 are limited to rotate.
The driving device 6 is used for driving the first lead screw 1 or the second lead screw 2, and driving the other lead screw to rotate through gear transmission, so as to drive the first moving part 31 and the second moving part 32, and the third moving part 33 and the fourth moving part 34 to move oppositely or oppositely. The driving device 6 can be driven by a manual rotation mode or a motor driving mode.
Further, the test device further comprises: a first guide lever 7 slidably connected to the first moving member 31 and the second moving member 32, and a second guide lever 8 slidably connected to the third moving member 33 and the fourth moving member 34. Preferably, the first guide rod 7 is parallel to the first lead screw 1, the second guide rod 8 is parallel to the second lead screw 2, and the first guide rod 7 is fixed on two fixing plates 52 connected with the first lead screw 1, and the second guide rod 8 is fixed on the other two fixing plates 52 connected with the second lead screw 2. The first moving part 31 and the second moving part 32 are connected to the first guide rod 7 in a sliding mode, the first guide rod 7 plays a role in guiding and supporting, so that the first moving part 31 and the second moving part 32 can move more stably along with the rotary motion of the first lead screw 1, similarly, the third moving part 33 and the fourth moving part 34 are connected to the second guide rod 8 in a sliding mode, the second guide rod 8 plays a role in guiding and supporting, so that the third moving part 33 and the fourth moving part 34 move more stably along with the rotary motion of the second lead screw 2, preferably, the first guide rod 7 and the second guide rod 8 are respectively parallel to the first lead screw 1 and the second lead screw 2, the structure is symmetrical and simple, and the first guide rod 7 and the second guide rod 8 further play a better role in guiding and supporting.
In order to realize the automatic control of the test device, the following measures are adopted:
force sensors 91 and/or displacement sensors 92 are respectively installed between the first moving member 31 and the second moving member 32, and between the third moving member 33 and the fourth moving member 34. The force sensor 91 and the displacement sensor 92 between the first moving part 31 and the second moving part 32, and the force sensor 91 and the displacement sensor 92 between the third moving part 33 and the fourth moving part 34 can respectively detect the force and displacement values between the first moving part 31 and the second moving part 32 and between the third moving part 33 and the fourth moving part 34, and detect the stress magnitude and the stretched displacement condition of the tensile sample in two directions in real time. Further, load cells are connected to the first connector 41, the second connector 42, the third connector 43, and the fourth connector 44, respectively, so that the magnitude of the force applied to the tensile sample can be detected, and the magnitude of the clamping force can be detected to prevent the tensile sample from being damaged by excessive clamping.
Preferably, the first lead screw 1 or the second lead screw 2 is provided with a rotary encoder 93 for detecting the number of turns of the lead screw shaft. The encoder 93 can detect the number of turns of the shaft rotation of the first lead screw 1 or the second lead screw 2, so that the number of turns of the shaft rotation can be intuitively known according to the required stretching length of a stretching sample, and the precision of stretching control is improved.
Preferably, the drive means 6 is a servo motor. The rotation speed of the servo motor is controlled by an input signal, the servo motor can quickly respond, the position precision is very accurate, the servo motor can be used in an automatic control system, the servo motor has the advantages of small electromechanical time constant, high linearity and the like, a voltage signal can be converted into a torque and a rotation speed to drive a control object, and the automatic control system is convenient to realize.
Further, the test device further comprises: the device comprises a control module, an analysis module and a display module, wherein the control module is respectively in signal connection with the force sensor 91, the displacement sensor 92, the encoder 93 and the driving device 6, and the analysis module is respectively in signal connection with the control module, the force sensor 91, the displacement sensor 92 and the encoder 93. The control module controls the driving device 6 to rotate in the forward direction or in the reverse direction according to the numerical information provided by the force sensor 91, the displacement sensor 92 and the encoder 93, the forward rotation or the reverse rotation of the driving device 6 drives the first lead screw 1 to rotate in the forward direction or in the reverse direction, thereby driving the first moving part 31 and the second moving part 32 to move in opposite directions or vice versa, the first lead screw 1 rotates in forward direction or reverse direction, the first bevel gear 13 drives the second bevel gear 23 to rotate, the second lead screw 2 is driven to rotate, thereby driving the third moving part 33 and the fourth moving part 34 to move oppositely or vice versa, the analysis module analyzes the numerical information of the force sensor 91, the displacement sensor 92 and the encoder 93, and the control information of the control module is analyzed, relevant experimental curves of force and displacement, force and deformation, force and time and the like are drawn, and the display module displays the test result and the analysis result in real time.
Finally, in order to prevent the tensile test piece from popping out and the like during the test and to protect surrounding operators, a protective cover (not shown) is arranged on the periphery of the test device.
As shown in fig. 3, the method for manufacturing the flexible stress sensor by using the testing apparatus includes the following steps:
firstly, starting a driving device 6, driving a first lead screw 1 or a second lead screw 2, driving another lead screw to rotate through bevel gear transmission, further driving a first moving part 31 and a second moving part 32, and a third moving part 33 and a fourth moving part 34 to move oppositely, moving to the distance between the first moving part 31 and the second moving part 32 and the distance between the third moving part 33 and the fourth moving part 34, and accommodating a flexible elastic base material 101 between the two distances, so that the operation of the driving device 6 can be stopped;
fixing flexible elastic base materials 101 to the first connecting piece 41, the second connecting piece 42, the third connecting piece 43 and the fourth connecting piece 44 respectively;
thirdly, the driving device 6 is restarted to enable the first moving part 31, the second moving part 32, the third moving part 33 and the fourth moving part 34 to move oppositely, and the driving device 6 stops running when the first moving part and the second moving part move to a preset distance;
coating the conductive material 102 in the middle of the elastic base material 101, and curing the conductive material; the conductive material 102 is preferably a carbon nanotube, graphene, silver nanowire or the like, and the elastic matrix material is preferably SEBS, PDMS or the like;
and step five, repeating the step one, taking down the elastic base material 101, and finishing the manufacture of the flexible stress sensor 100.
In the flexible stress sensor 100 manufactured by biaxial stretching, since the stretched flexible elastic base material 101 is uniformly stressed in the biaxial stretching state, so that the elastic base material 101 with uniform expansion and contraction can be easily obtained, then the conductive material 102 is uniformly coated and fixed on the surface of the elastic base material 101, and finally, when the elastic base material 101 is restored to the unstretched state, the conductive material 102 is gathered on the surface of the elastic base material 101, and when the elastic base material 101 is stretched, the conductive material 102 is stretched accordingly, in the process, the resistance of the conductive material changes (or the conductive material 102 is arranged on both the front and back sides of the elastomer base material 101, namely the capacitive flexible stress sensor 100, and the tensile force is tested according to the change of the capacitance in the stretching process), so that the flexible stress sensor 100 manufactured in the process has good stretching performance and high measurement precision.
It should be understood that the above-described specific embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Obvious variations or modifications which are within the spirit of the invention are possible within the scope of the invention.

Claims (10)

1. A single drive biaxial tension test apparatus for the fabrication of flexible stress sensors comprising:
the first lead screw (1), the first lead screw (1) comprises a first thread (11), a second thread (12) and a first bevel gear (13) arranged between the first thread (11) and the second thread (12), and the rotating directions of the first thread (11) and the second thread (12) are opposite;
the second lead screw (2), the second lead screw (2) comprises a third thread (21), a fourth thread (22) and a second bevel gear (23) which is arranged between the third thread (21) and the fourth thread (22) and is in transmission connection with the first bevel gear (13), the rotating directions of the third thread (21) and the fourth thread (22) are opposite, and the first lead screw (1) and the second lead screw (2) are perpendicular to each other;
a moving member (3), the moving member (3) comprising a first moving member (31) threadedly connected to the first thread (11), a second moving member (32) threadedly connected to the second thread (12), a third moving member (33) threadedly connected to the third thread (21), and a fourth moving member (34) threadedly connected to the fourth thread (22);
a connection (4), said connection (4) comprising a first connection (41) connecting the tensile specimen to said first moving member (31), a second connection (42) connecting the tensile specimen to said second moving member (32), a third connection (43) connecting the tensile specimen to said third moving member (33) and a fourth connection (44) connecting the tensile specimen to said fourth moving member (34);
the limiting device (5), the first lead screw (1) and the second lead screw (2) are arranged on the limiting device (5) and rotate;
the driving device (6) is used for driving the first lead screw (1) or the second lead screw (2), and driving the other lead screw to rotate through gear transmission, so that the first moving part (31), the second moving part (32), the third moving part (33) and the fourth moving part (34) are driven to move oppositely or oppositely.
2. The single drive biaxial tension test apparatus as set forth in claim 1, wherein: the limiting device (5) comprises a base (51) and four fixing plates (52) fixed on the base (51), a bearing (53) is mounted on each fixing plate (52), and two ends of the first lead screw (1) and two ends of the second lead screw (2) are respectively fixed on the bearings (53).
3. The single drive biaxial tension test apparatus as set forth in claim 1, further comprising: a first guide rod (7) slidably connected to the first moving member (31) and the second moving member (32), and a second guide rod (8) slidably connected to the third moving member (33) and the fourth moving member (34).
4. The single drive biaxial tension test apparatus as set forth in claim 3, wherein: the first guide rod (7) is parallel to the first lead screw (1), and the second guide rod (8) is parallel to the second lead screw (2).
5. The single drive biaxial tension test apparatus as set forth in claim 1, wherein: a first force sensor (91) or/and a displacement sensor (92) are respectively arranged between the first moving part (31) and the second moving part (32), and between the third moving part (33) and the fourth moving part (34).
6. The single drive biaxial tension test apparatus as set forth in claim 5, wherein: and the first lead screw (1) or the second lead screw (2) is provided with a rotary encoder (93) for detecting the rotation number of turns of the lead screw shaft.
7. The single drive biaxial tension test apparatus as set forth in claim 6, wherein: the driving device (6) is a servo motor.
8. The single drive biaxial tension test apparatus as set forth in claim 7, further comprising: the device comprises a control module, an analysis module and a display module, wherein the control module is in signal connection with the first force sensor (91), the displacement sensor (92), the rotary encoder (93) and the driving device (6), and the analysis module is in signal connection with the control module, the first force sensor (91), the displacement sensor (92) and the rotary encoder (93).
9. The single drive biaxial tension test apparatus as set forth in any one of claims 1 to 8, wherein: the periphery of the test device is provided with a protective cover.
10. A method for manufacturing a flexible stress sensor by using the test device of claim 1, comprising the steps of:
firstly, starting a driving device (6), driving a first lead screw (1) or a second lead screw (2), driving another lead screw to rotate through bevel gear transmission, further driving a first moving part (31), a second moving part (32), a third moving part (33) and a fourth moving part (34) to move oppositely, moving to a distance between the first moving part (31) and the second moving part (32) and a distance between the third moving part (33) and the fourth moving part (34), and accommodating a flexible elastic base material (101) between the two distances, so that the driving device (6) can be stopped;
secondly, fixing the flexible elastic base material (101) on the first connecting piece (41), the second connecting piece (42), the third connecting piece (43) and the fourth connecting piece (44) respectively;
thirdly, the driving device (6) is restarted to enable the first moving part (31), the second moving part (32), the third moving part (33) and the fourth moving part (34) to move oppositely, and the driving device (6) stops running when the first moving part and the second moving part move to a preset distance;
coating a conductive material (102) in the middle of the elastic base material (101) and curing the conductive material;
and step five, repeating the step one, taking down the elastic base material (101), and finishing the manufacture of the flexible stress sensor 100.
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