Tensile deformation measuring device and tensile tester

Abstract

The present application belongs to the technical field of testing the strength and durability characteristics of solid materials by applying tension, and provides a tensile deformation measuring device and a tensile tester. The tensile deformation measuring device comprises a fixed tube and a telescopic rod, the telescopic rod is inserted into the fixed tube, a sliding seat, a sleeve is worn on the telescopic rod and freely slides on the telescopic rod, one clamp is connected to each sliding seat, and the clamps are respectively clamped at the two ends of a certain section on the sample. Before measurement, the depth of the first end of the telescopic rod inserted into the fixed tube is variable. During measurement, the depth of the first end of the telescopic rod inserted into the fixed tube is fixed. The distance between the two sliding seats in the present application is variable, the measuring gauge length is variable, the distance between the two sliding seats is variable, and the distance of the telescopic rod inserted into the fixed tube is adjustable, so that the measurement space adaptability is improved, thereby being suitable for testing of various sizes and various occasions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of testing the strength and durability characteristics of solid materials by applying tension, and particularly relates to a tensile deformation measuring device and a tensile tester. BACKGROUND

[0002] With the rapid development of new materials and new technologies, there is an increasing demand for testing new materials. The tensile property testing of non-metallic products such as waterproofing membranes, rubber, and films is performed by testing the tensile strength and deformation resistance to evaluate the strength and durability of the materials. When measuring deformation, it is sometimes necessary to change the measurement space and the gauge length, but the existing tensile deformation measuring device cannot meet such requirements, let alone the testing requirements of new materials. SUMMARY

[0003] The present application provides a tensile deformation measuring device and a tensile tester that can change the measurement space and the gauge length.

[0004] The tensile deformation measuring device comprises:

[0005] a first support and a second support;

[0006] a fixed tube mounted on the first support;

[0007] a telescopic rod comprising a first end and a second end, the first end of the telescopic rod being inserted into the fixed tube, and the second end of the telescopic rod being mounted on the second support;

[0008] two sliding seats sleeved on the telescopic rod and freely sliding on the telescopic rod, each sliding seat being connected with a clamp, and the clamps being respectively clamped at both ends of a certain section on the test sample;

[0009] Before measurement, the depth of the first end of the telescopic rod inserted into the fixed tube is variable, and during measurement, the depth of the first end of the telescopic rod inserted into the fixed tube is fixed.

[0010] In an embodiment, the first support and the second support are each provided with a first through hole in the longitudinal direction, and the hole wall of the first through hole is further provided with a first threaded hole identical to the external one;

[0011] The tensile deformation measuring device further comprises:

[0012] a support column passing through the first through hole and being fixed in the first through hole by screwing a screw into the first threaded hole.

[0013] In one embodiment, two of the fixed tubes are installed on the first support at the same level, and each of the fixed tubes is inserted with one of the telescopic rods.

[0014] In one embodiment, one end of the fixed tube fixed on the first support is the first end, and the first end of the fixed tube is externally provided with threads;

[0015] The tensile deformation measuring device further comprises:

[0016] A positioning plate connected with the first support, and the positioning plate is provided with a threaded hole;

[0017] A fixing member which is cylindrical and has a first end opening inwardly bent, and the inner wall and the outer wall of the second end are provided with threads;

[0018] The first end of the fixed tube is limited by the first end of the fixing member after being screwed into the fixing member after passing through the first support, and the second end of the fixing member is limited by the first support after being screwed into the threaded hole of the positioning plate from the outside of the tensile deformation measuring device.

[0019] In one embodiment, the telescopic rod is inserted from the second end of the fixed tube, the outer wall of the second end of the fixed tube is chamfered and externally provided with threads, and the wall of the second end of the fixed tube is divided into several petals by an opening slot;

[0020] The tensile deformation measuring device further comprises:

[0021] A locking nut which is screwed on the second end of the fixed tube.

[0022] In one embodiment, the clamp comprises:

[0023] Two clamping arms, one end of the clamping arm is hinged to the sliding seat, and the other end is hinged to a blade;

[0024] Two blades, the inner side of the two blades is planar and toothed, and the outer side of the blade is hinged to the clamping arm;

[0025] A spring, both ends of the spring are connected to two clamping arms respectively, and the connection points are located at the middle segments of the clamping arms; when the inner sides of the two blades are in contact, the spring is in a non-deformation state or a stretching state.

[0026] In one embodiment, the sliding seat is sleeved on the telescopic rod through a linear bearing.

[0027] In one embodiment, one of the two sliding seats is placed with a range finder mounting seat, and the other is placed with a reflector; the range finder mounting seat is provided with a laser range finder.

[0028] In one embodiment, a reinforcing rod is arranged below the distance meter mounting seat, and a lower end of the reinforcing rod is sleeved on the telescopic rod through a linear bearing.

[0029] The tensile tester comprises the tensile deformation measuring device.

[0030] The tensile deformation measuring device comprises a fixed tube, a telescopic rod, sliding seats, and clamps. Before measurement, the first end of the telescopic rod can be inserted into the fixed tube to a variable depth. The distance between the two sliding seats can be changed to achieve variable measurement gauge length. The distance between the two sliding seats can be changed, and the distance of the telescopic rod inserted into the fixed tube can be adjusted to improve the adaptability of the measurement space, thereby being suitable for testing of various sizes and various occasions.

[0031] The tensile tester comprises the tensile deformation measuring device. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The structure of the tensile deformation measuring device in Example 1 is shown in the cross-sectional view from the front view angle. Figure Two

[0033] Figure 2 The structure of the tensile deformation measuring device in Example 1 is shown in the cross-sectional view from the top view angle. Figure Two

[0034] Figure 3 The cross-sectional view of E-E in the tensile deformation measuring device is shown. Figure 1 The cross-sectional view of E-E in the tensile deformation measuring device is shown. Figure Two

[0035] Figure 4 The cross-sectional structure of the fixed tube in Example 1 is shown. Figure Two

[0036] Figure 5 The cross-sectional structure of the fixed tube in Example 1 is shown. Figure Two

[0037] Figure 6 The structure of the tensile tester provided in Example 2 is shown. DETAILED DESCRIPTION

[0038] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. The principles and characteristics of the present application are described below in conjunction with the drawings, and it should be noted that the embodiments in the present application and the characteristics in the embodiments can be combined with each other without conflict. The examples are only used to explain the present application and are not used to limit the scope of the present application.

[0039] Embodiment 1

[0040] The present embodiment provides a tensile deformation measuring device, referring to Figures 1 to 5 , comprising:

[0041] a first support 6 and a second support 1;

[0042] a fixed tube 5 mounted on the first support 6;

[0043] a telescopic rod 3 comprising a first end and a second end, the first end of the telescopic rod 3 being inserted into the fixed tube 5, and the second end of the telescopic rod 3 being mounted on the second support 1;

[0044] two sliding seats 14 sleeved on the telescopic rod 3 and freely sliding on the telescopic rod 3, and a clamp being connected to each sliding seat 14, the clamps being respectively clamped at both ends of a certain section of the sample 12;

[0045] Before measurement, the depth of the first end of the telescopic rod 3 inserted into the fixed tube 5 is variable; during measurement, the depth of the first end of the telescopic rod 3 inserted into the fixed tube 5 is fixed.

[0046] After the first support 6 is fixed in position during installation, the depth of the telescopic rod 3 inserted into the fixed tube 5 is adjusted to adapt to the position and length of the sample, the relative positions of the telescopic rod 3 and the fixed tube 5 are fixed, the position of the second support 1 is fixed, and the positions of the two sliding seats 14 on the telescopic rod 3 are adjusted so that the clamps clamp the middle specified gauge length section of the sample 12; the two clamps are driven to move in parallel during the stretching of the sample 12, and the change in the positions of the two clamps is measured by the distance meter, and the change is transmitted to the testing instrument through a signal line and recorded as a group of data at each time point in chronological order.

[0047] When the sample 12 is axially stretched and elongated, the two clamps drive the sliding seats 14 to move axially with the corresponding points of the sample 12, and the change in the distance between the two clamps, i.e., the deformation, is accurately measured by the distance meter, and the distance meter signal is received and recorded by the testing instrument.

[0048] The tensile deformation measuring device provided by the present embodiment solves the problem of length change in the use state and the moving state of tensile deformation measurement, and the problem of different gauge lengths required by different materials, and realizes on-site deformation detection of non-metallic samples.

[0049] In the embodiment, the first support 6 and the second support 1 are both provided with a first through hole in the longitudinal direction, and a first threaded hole identical to the outside is arranged on the hole wall of the first through hole;

[0050] The tensile deformation measuring device further comprises:

[0051] The support column 11 passes through the first through hole, and the support column 11 is fixed in the first through hole by screwing the screw 10 in the first threaded hole.

[0052] In the above embodiment, the height of the first support 6 and the second support 1 is adjusted by changing the position of the support column 11 in the first through hole, so that the clamp is aligned with the sample 12, and the axis of the fixed tube 5 and the telescopic rod 3 is parallel to the tensile axis of the sample 12, thereby ensuring the accuracy of the deformation measurement.

[0053] In the embodiment, two fixed tubes 5 are installed on the first support 6 at the same horizontal height, and one telescopic rod 3 is inserted into each fixed tube 5. By arranging two fixed tubes 5 and corresponding two telescopic rods 3, the clamp and the distance meter are stably installed, thereby ensuring the accuracy of the measurement.

[0054] In the embodiment, one end of the fixed tube 5 fixed on the first support 6 is the first end, and a thread is arranged outside the first end of the fixed tube 5.

[0055] The tensile deformation measuring device further comprises:

[0056] The positioning plate 7 is connected with the first support 6 by the set screw 9, and the positioning plate 7 is provided with a threaded hole; the fixing member 8 is cylindrical, the first end opening is inwardly bent, and the inner wall and the outer wall of the second end are both provided with a thread.

[0057] The first end of the fixed tube 5 is fixed by the first end of the fixing member 8 after passing through the first support 6 and being screwed into the fixing member 8, and the second end of the fixing member 8 is limited by the first support 6 after being screwed into the threaded hole of the positioning plate 7 from the outside of the tensile deformation measuring device (the left side in Figure 1 and Figure 2 ).

[0058] Through the above embodiment, the tensile deformation measuring device provided by the embodiment is convenient to disassemble and install, and is convenient to carry.

[0059] In the embodiment, the telescopic rod 3 is inserted from the second end of the fixed tube 5, the outer wall of the second end of the fixed tube 5 is chamfered and provided with a thread, the tube wall of the second end of the fixed tube 5 is divided into several petals by an opening slot, and reference is made to Figure 4 .

[0060] The tensile deformation measuring device further comprises:

[0061] Locking nut 4, locking nut 4 is screwed on the second end of the fixed tube 5, locking nut 4 is processed in the cone hole, refer to Figure 5 .

[0062] Telescopic rod 3 is inserted into the fixed tube 5, when the locking nut 4 is locked, the second end of the fixed tube 5 is pressed and deformed to hold the telescopic rod 3, the fixed tube 5 and the telescopic rod 3 are rigidly connected as a whole, and there is no relative displacement between the two during measurement, thereby ensuring the accuracy of the deformation measurement.

[0063] In this embodiment, refer to Figure 3 , the clamp comprises:

[0064] Two clamping arms 17, one end of the clamping arm 17 is hinged to the sliding seat 14, and the other end is hinged to a knife edge 18;

[0065] Two knife edges 18, the inner side of the two knife edges 18 is planar and toothed, and the outer side of the knife edge 18 is hinged to the clamping arm 17 through the pin shaft 20;

[0066] Spring 19, both ends of the spring 19 are connected to the two clamping arms 17, and the connection points are located at the middle sections of the clamping arms 17; when the inner sides of the two knife edges 18 are in contact, the spring 19 is in a non-deformed state or a stretched state. The two clamping arms 17 are pulled inward by the spring 19 at the middle positions, and the two knife edges 18 clamp the surface of the test sample 12; during measurement, the clamp can be tightly fixed on the test sample 12, and there is no misalignment between the two, thereby ensuring the accuracy of the deformation measurement.

[0067] In this embodiment, the sliding seat 14 is sleeved on the telescopic rod 3 through the linear bearing 15, the process of displacement of the sliding seat 14 driven by the tensile deformation of the test sample 12 is smooth and does not jam, thereby ensuring the accuracy of the deformation measurement.

[0068] In this embodiment, the left sliding seat 14 is placed on the distance measuring instrument mounting seat 13, and the laser distance measuring instrument 2 is fixed on the distance measuring instrument mounting seat 13; the distance measuring instrument mounting seat 13 is located on the left side of the left sliding seat 14, and the right sliding seat 14 is placed on the reflector 16, which is used to reflect the light beam emitted by the laser distance measuring instrument 2.

[0069] In this embodiment, a reinforcing rod (not shown in the figure) is arranged below the distance measuring instrument mounting seat 13, the lower end of the reinforcing rod is sleeved on the telescopic rod 3 through a linear bearing, and the torque generated by the weight of the laser distance measuring instrument 2 on the sliding seat 14 is prevented from causing jamming during the movement of the sliding seat 14 and affecting the measurement accuracy.

[0070] Embodiment 2

[0071] This embodiment provides a tensile tester, which comprises the tensile deformation measurement device provided in embodiment 1, and refer to Figure 6 .

[0072] The tensile tester comprises a tensile testing machine 100 and a tensile deformation measuring device 200 provided in Embodiment 1.

[0073] The tensile testing machine 100 comprises

[0074] a workbench 1015 and a fixed beam 104;

[0075] a guide pipe 105, the two ends of which are connected to the workbench 1015 and the fixed beam 104 respectively;

[0076] a telescopic rod 102, comprising a first end and a second end, the first end being slidably connected to the guide pipe 105;

[0077] a tensile testing assembly, comprising a first tensile clamp 1017 and a second tensile clamp 1018, the first tensile clamp 1017 being installed at the second end of the telescopic rod 102, and the second tensile clamp 1018 being connected to a tensile assembly, the tensile assembly being capable of stretching the second tensile clamp 1018 to move along the axial direction of the guide pipe 105;

[0078] Before measurement, the first end of the telescopic rod 102 is inserted into the guide pipe 105 and can slide freely; during measurement, the depth of the first end of the telescopic rod 102 inserted into the guide pipe 105 is fixed.

[0079] It can be understood that a locking mechanism is further included, which is used to lock the telescopic rod 102 so that it does not slide during the tensile testing experiment. During tensile testing, the telescopic rod 102 is pulled out from the guide pipe by a certain length, and then the locking mechanism fixes the telescopic rod 102, and the two ends of the sample 12 are clamped by the first tensile clamp 1017 and the second tensile clamp 1018 respectively. Through the stretching of the tensile assembly, the position change of the second tensile clamp 1018 and the load at different times are recorded, and the tensile testing is realized.

[0080] The tensile testing machine in the embodiment can save space when being transported or carried by pushing the telescopic rod 102 into the guide pipe 105, and the length of the sample 12 and the length of the tensile deformation of the sample 12 during testing are greater when the telescopic rod 102 is pulled out from the guide pipe 105 and fixed according to the length of the sample 12 or the testing requirements during use. The telescopic rod 3 of the tensile deformation measuring device 200 can also be partially retracted into the fixed pipe 5 to reduce the occupied space. That is, the tensile tester in the embodiment can adapt to more materials and larger sizes of samples without changing the space occupied during transportation or carrying.

[0081] And in the embodiment, the support column 11 of the tensile deformation measuring device 200 can be inserted into the connecting holes at both ends of the tensile testing machine 100, so that the tensile deformation measuring device 200 and the tensile testing machine 100 are in a detachable relationship, and the dismounting and mounting are quick. When transporting or carrying, the tensile deformation measuring device 200 and the tensile testing machine 100 can be packaged separately, and the portability of the whole tester is improved without losing the range of the tester.

[0082] Specifically, the stretching assembly comprises:

[0083] The lead screw 109 is parallel to the guide pipe 105, and a nut 107 is further mounted on the lead screw 109, and the nut 107 is fixedly connected to the second stretching clamp 1018;

[0084] The driving member is used for driving the lead screw 109 to reverse.

[0085] The lead screw 109 is driven by the driving member, so that the nut 107 on the lead screw 109 is displaced, thereby driving the second stretching clamp 1018 to apply a load to the sample 12.

[0086] In the embodiment, the nut 107 is connected with the second stretching clamp 1018 through a moving cross beam 106, specifically, the lower end of the moving cross beam 106 is fixedly connected with the nut 107, the top end of the moving cross beam 106 is fixedly connected with a load sensor 108, the second stretching clamp 1018 is fixedly connected with the load sensor 108, and the load sensor 108 records the load applied by the second stretching clamp 1018 to the sample 12 in real time.

[0087] It can be understood that a control system is further included for collecting and recording the movement amount of the nut 107 and the value of the load sensor 108 at the same time.

[0088] The second stretching clamp 1018 and the load sensor 108 are respectively arranged on two opposite sides of the moving cross beam 106, specifically, the load sensor 108 is arranged on the side away from the first stretching clamp 1017, the second stretching clamp 1018 is arranged on the side close to the first stretching clamp 1017, the load sensor 108 is bolted to the moving cross beam 106, the first stretching clamp 1017 and the second stretching clamp 1018 are oppositely arranged, the moving cross beam 106 is provided with a through hole, and a connecting rod is threadedly installed in the through hole, and two ends of the connecting rod are respectively fixedly connected with the second stretching clamp 1018 and the load sensor 108. In this way, the second stretching clamp 1018 and the load sensor 108 can be conveniently disassembled and replaced.

[0089] The workbench 1015 and the fixed cross beam 104 are both provided with bearings 1016, the lead screw 109 passes through the two bearings 1016, and one end of the lead screw 109 close to the workbench 1015 is drivingly connected with a servo motor.

[0090] like Figure 6 As shown, this arrangement of the lead screw 109 and guide tube 105 in parallel reduces the overall length of the device. During use, the space for clamping the sample 12 can be obtained by extending the telescopic rod 102 inside the guide tube 105, which improves portability without sacrificing the measuring range.

[0091] The output end of the servo motor is connected to a planetary reducer, the output end of the planetary reducer is connected to a small pulley, the lead screw 109 is connected to a large pulley, and the small pulley and the large pulley are connected by a belt.

[0092] The servo motor is located on the side of the lead screw 109. The small pulley and the large pulley are connected by a synchronous belt, which reduces the overall length of the device and improves portability. The planetary reducer and pulley assembly can improve the output torque and ensure the tensile force.

[0093] In this embodiment, a telescopic beam 101 is also included. One end of the telescopic beam 101 is fixedly connected to the telescopic rod 102, and the other end is fixedly connected to the first tension clamp 1017.

[0094] The fixed crossbeam 104 has a through hole, and the end of the guide tube 105 near the fixed crossbeam 104 has a first pin hole corresponding to the through hole. The telescopic rod 102 has a second pin hole, and a pin 103 is inserted into the through hole of the fixed crossbeam 104, passing through both the first and second pin holes. The telescopic rod 102 slides in the guide tube 105. After the second pin hole aligns with the first pin hole, the telescopic rod 102 is fixed and limited by the pin 103, ensuring that the telescopic rod 102 is fixed during the tensile test.

[0095] Preferably, multiple second pin holes are provided and arranged along the axial direction of the telescopic rod 102 so that the insertion depth of the telescopic rod 102 can be controlled to accommodate samples 12 of different sizes.

[0096] The tensile testing instrument provided in this embodiment includes the tensile deformation measuring device described in Embodiment 1, and therefore can also achieve the technical effect of variable gauge length, which will not be described again.

[0097] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0098] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", "unfixed", and the like should be construed broadly and can include fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or the like; direct connections, or indirect connections via an intermediate medium; or internal communication between two elements or interaction between two elements. The specific meanings of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

[0099] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate medium. Moreover, the first feature is "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature is "under", "below", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0100] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, different embodiments or examples described in the present application and the features of different embodiments or examples can be combined and combined by those of ordinary skill in the art without contradiction.

[0101] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present application.

Claims

1. A tensile deformation measuring device, characterized by, The tensile deformation measuring device comprises: a first support and a second support; a fixed tube mounted on the first support; a telescopic rod comprising a first end and a second end, the first end of the telescopic rod being inserted into the fixed tube, and the second end of the telescopic rod being mounted on the second support; two sliding seats sleeved on the telescopic rod and freely sliding on the telescopic rod, each of the two sliding seats being connected with a distance measuring clamp, and the two distance measuring clamps being clamped at two ends of a certain section of a sample respectively; before measurement, the depth of the first end of the telescopic rod inserted into the fixed tube is variable; during measurement, the depth of the first end of the telescopic rod inserted into the fixed tube is fixed; the first support and the second support are each provided with a first through hole in the longitudinal direction, and a first threaded hole identical to the outside is further arranged on the hole wall of the first through hole; the tensile deformation measuring device further comprises: a support column passing through the first through hole and being fixed in the first through hole by screwing a screw in the first threaded hole; the support column is inserted into the connecting holes at two ends of a tensile testing machine, and the support column is arranged in parallel with the tensile testing machine; one of the two sliding seats is placed with a distance measuring instrument mounting seat, and the other is placed with a reflector; a laser distance measuring instrument is arranged on the distance measuring instrument mounting seat; the tensile testing machine comprises two tensile clamps clamped at two ends of the sample respectively; during the stretching of the sample, the two distance measuring clamps are driven to move in parallel, and the deformation of the sample is measured by measuring the position change of the two distance measuring clamps.

2. The stretch deformation measuring device according to claim 1, characterized in that two fixed tubes are mounted on the first support at the same horizontal height, and each of the fixed tubes is inserted with a telescopic rod.

3. The stretch deformation measuring device of claim 1, wherein one end of the fixed tube fixed on the first support is a first end, and the first end of the fixed tube is externally provided with a thread; the tensile deformation measuring device further comprises: a positioning plate connected with the first support, and provided with a threaded hole; a fixing member in the shape of a cylinder, the first end of which is inwardly bent, and the inner wall and the outer wall of the second end are both provided with threads; the first end of the fixed tube is limited by the first end of the fixing member after passing through the first support and being screwed into the fixing member, and the second end of the fixing member is limited by the first support after being screwed into the threaded hole on the positioning plate from the outside of the tensile deformation measuring device.

4. The stretch deformation measuring device of claim 1, wherein the telescopic rod is inserted from the second end of the fixed tube, the outer wall of the second end of the fixed tube is provided with a chamfer and an external thread, and the tube wall of the second end of the fixed tube is divided into several petals by an open slot; the tensile deformation measuring device further comprises: a locking nut screwed on the second end of the fixed tube.

5. The stretch deformation measuring device of claim 1, wherein, the clamp comprises: two clamp arms, one end of each of the clamp arms being hinged to the sliding seat, and the other end being hinged to a blade; two blades, the inner sides of the two blades being flat and provided with teeth, and the outer sides of the blades being hinged to the clamp arms; a spring, two ends of the spring being connected to the two clamp arms respectively, and the connection points being located at the middle sections of the clamp arms; when the inner sides of the two blades are in contact, the spring is in a non-deformed state or a stretched state.

6. The stretch deformation measuring device of claim 1, wherein, the sliding seat is sleeved on the telescopic rod through a linear bearing.

7. The stretch deformation measuring device of claim 1, wherein, The rangefinder mounting seat is provided with a reinforcing rod below, and the lower end of the reinforcing rod is sleeved on the telescopic rod through a linear bearing.

8. Tensile tester characterized in that, A tensile deformation measuring device according to any one of claims 1 to 7.

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