LU501651B1 - Device and method for testing micro-strain-resistance response under tension and compression state - Google Patents

Device and method for testing micro-strain-resistance response under tension and compression state Download PDF

Info

Publication number
LU501651B1
LU501651B1 LU501651A LU501651A LU501651B1 LU 501651 B1 LU501651 B1 LU 501651B1 LU 501651 A LU501651 A LU 501651A LU 501651 A LU501651 A LU 501651A LU 501651 B1 LU501651 B1 LU 501651B1
Authority
LU
Luxembourg
Prior art keywords
sample
strain
resistance
under tension
stretching
Prior art date
Application number
LU501651A
Other languages
French (fr)
Inventor
Runzhi Zhang
Zhaoxin Liu
Linping Su
Ming Liang
Jun Kong
Xuehao Luan
Zhanyong Yao
Chengyong Chen
Original Assignee
Shandong High Speed Infrastructure Construction Company
Shandong Hi Speed Group Co Ltd
Shandong Expressway Jiwei Expressway Co Ltd
Univ Shandong
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong High Speed Infrastructure Construction Company, Shandong Hi Speed Group Co Ltd, Shandong Expressway Jiwei Expressway Co Ltd, Univ Shandong filed Critical Shandong High Speed Infrastructure Construction Company
Priority to LU501651A priority Critical patent/LU501651B1/en
Application granted granted Critical
Publication of LU501651B1 publication Critical patent/LU501651B1/en

Links

Classifications

    • 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
    • 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
    • G01B21/32—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 the deformation in a solid
    • 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
    • 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
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075—Strain-stress relations or elastic constants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

This invention comprises strain console, sample strain measuring extensometer and sample resistance measuring device; the strain control console comprises a frame, wherein a sample clamping part and a sample stretching part are respectively arranged on the frame; the sample stretching part is connected with the sample holding part, and the stretching of the sample stretching part can drive the sample holding part to stretch, so that the sample can be stretched; the sample strain measuring extensometer and the sample resistance measuring device are respectively in contact with the sample to measure the strain and resistance of the sample under tension and compression. The invention has the advantages that it can be applied to the measurement of micro-strain under tension and compression, and it has high measurement accuracy, extremely high measurement efficiency, adjustable and controllable size of applicable test samples and long service life of the device.

Description

Description 10501651 Device and method for testing micro-strain-resistance response under tension and COMpression stais Technical Neid The invention relates to the technical field of road detection devices, particularly relates to device and method for testing micro-strain-resistance response under tension and compression stats, Background The statements in this part only provide background information related to the present invention, and do not necessarily constitutes prior art, China's latest specifications for design of highway asphalt pavement (TG 050-2047) cisariy puis forward that pavement structural sirain is the key technical index of pavement structural design, and the deformation of asphalt pavement under cyclic wheel load will directly affect the permanent deformation and fatigue cracking of asphall pavement. Under normal carrying conditions, the deformation of asphalt pavement surface and base course is often less than 100ue. Such a small amount of deformation poses a great challenge to the monitoring accuracy and the monitoring sensor. in recent years, related researchers have studied high-precision micro-strain monitoring materials and sensing technology by using force-slectric response method, but there is a lack of corresponding effective high-precision Mmicro-strain-resistance response testing device suitable for tensile stress and compressive Stress.
Summary In order io solve the problems described above, this invention provides device and method for testing micro-strain-resistance response under tension and compression stats, which has many advantages, including high detection accuracy, long service life, simple and convenient operation, high measurement efficiency, and it does not need of large-scale equipment, adiusiable and controllable size of apphcable test samples, and it is suitable for high-precision detection of small strain-resistance.
in implementation, the invention adopts the following solutions:
Device for testing Micro-strain-vesistance response under tension and compression 00 state comprises strain console, sample strain measuring extensometer and sample resistance measuring device, the strain control console comprises a frame, wherein a sample clamping part and a sample stretching part are respectively arranged on the frame; the sample stretching part is connected with the sample clamping part, and the stretching of the sample stretching part can drive the sample clamping part to stretch, thereby realizing the stretching of the sample: the sample strain measuring extensometer and the sample resistance measuring device are respectively in contact with the sample to measure the strain and resistance of the sample under tension and Compression, in other implementation, the invention adopts the following solutions: Method for testing micro-strain-resistance response under tension and compression state comprises the following steps. two ends of the sample fo be measured are clamped and fixed by the fixed clamping piece and the movable clamping piece respectively; when strefehing the sample, turn the screw in the set direction to make the moving part move away from the sample clamping cart, the movement of the moving piece drives the moving clamping piece to move in the same direction, thereby realizing the sirelching of the sample to be measured; in the process of stretching, the strain data is measured by the sample strain measuring extensometer, the resistance values is measured by the sample resistance measuring device, and obtaining the corresponding relationship between the strain data and the resistance value, in other implementation, the invention adopts the following solutions: Method for testing micro-strain-resistance response under tension and Compression state comprises the following steps. when compressing the sample, rotate the screw in the opposite direction, so that the moving part moves to the direction close to the sample clamping part: the movement of the moving piece drives the moving clamping piece to move in the same direction, thereby reglizing the compression of the sample to be tesied in the process of compression, the strain data is measured by the sample strain measuring extensometer, the resistance value is measured by the sample resistance measuring device, and obtaining the corresponding relationship between the strain data and the resistance value.
Compared with the prior art, the invention has the baneficial effects that
{1} Device for testing micro-strain-resistance response under tension and compression 99 state provided by the invention can be applied to the measurement of micro-strain under tension and compression, and # has simple and convenient operation with high measurement accuracy, extremely high measurement efficiency, and il does not need large-scale equipment, it has adjustable and controllable size of applicable test samples and long service life of the device, {2) The invention effectively solves the problem of sample slippage by designing the clamping and fixing sieeve and the sample clamping insulator, and avoids the contact between the sample with conductivity and metal products such as sirain control console and extensometer, and it effectively prevents the introduction of experimental errors.
{3} The specialiy-made precision ball screw of the invention can realize effective control of micro-strain, and avoid the problem of insufficient precision of micro-strain control degree in large tensile testing machine.
Brief Description Of The Figures Fig. 1 i8 a structural schematic diagram of a device for testing micro-strain-resistance response under tension and compression in the first embodiment of the present invention; Fig. 2 is a structural diagram of a clamping plate with grooves in the first embodiment of the present invention: Fig. 3 is a schematic diagram of an antiskid clamping insulator in the first embodiment of the present invention; Vherein,
1. frame, J screw, 3 moving plate, 4 moving clamping plate, 4-1, groove, 4-2. anti-skid clamping piece, 5. fixed clamping plate, 6. connecting beam, 7. strain measuring extensometer, 8 data cable, 9. strain measuring extensometer data reading computer, 10. sisctrode, 11. wire, 12. multimeter, 13. multimeter data reading computer.
Description of the present invention it should be noted that the following detailed description is exemplary and intended Io provide further explanation for this application. Unisss otherwise specified, ail technical and scientific terms used in this invention have the same meanings as commonly understood by ordinary technicians in the technical feld to which this application belongs.
il should be noted thai the terminology used here is only for desonbing spacing 00) embodiments, and is not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, in addition, it should be understood that when the terms “comprising” and/or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and/or combinations thereof, Embodiment 1 in one or more embodiments, a high-precision micro-strain-resistance response test device for tension and compression is disclosed, which comprises a strain console, a resistance test mullimeter 12, a high-precision strain measurement extensometer 7, a multimeter data reading computer 12, and a high-precision strain measurement axtensometar dala reading computer 9. The sample is fixed on the strain console, the resistance test multimeter 12 measures the resistance of the sample and transmits the data to the multimeter data reading computer 13; The high-pracision strain gauge extensometer 7 measures the strain of the samples in tension and compression respectively, and transmits the data to the high-precision strain gauge data reading computer 9.
in this embodiment, the gauge range of the high-precision strain measuring extensometer / can be 10mm-300mm, and the measuring accuracy is 0.0001mm, the data acquisition is read and recorded by computer through specific acquisition software. insulation treatment should be carried out at the position where the extensometer holds the sample blade.
The maximum measuring range of multimeter 12 resistance is 100 MO, 1000 MO or 10000 MO, which can be measured by two-electrode or four-electrode method. Its dala acquisition is read and recorded by computer through specific acquisition software. Among them, the strain console structure includes: frame 1, sample holding part and sample stretching part; The frame 1 includes fixing plates arranged at both ends, and three pillars are transversely fixed between the two fixing plates, The two fing plates are respectively provided with through holes for foung and clamping samples and threaded through holes for passing through the screw € In addition, the frame 1 is also provided with a moving plate 3 rratched with the screw 2 and a moving clamping plate 4 for fixing the sample. The moving plate 3 is provided with a through hole with a thread. The rotation of the screw 2 can AVE 0°] the moving plats 3 to move, and the moving plate 3 is connected with the moving clamping plate 4, and the moving plate 3 drives the moving clamping plaie À Io move, 50 as to stretch or compress the clamped sample.
Referring to Fig, 2 and Fig. 3, the sample clamping part includes a fixed clamping plate 5 and a moving clamping plate 4 which are arranged on the frame 1; The fixed clamping plate 5 is fixed at the end of the frame 1 and cooperates with the fing plate at the other end of the frame | to fix the three oviindrical rods; At the same time, the fixed clamping plate 5 and the movable clamping plate 4 are both composed of two completely symmetrical clamping plates with grooves 4-1, each clamping plate is provided with a semi-cylindrical groove 4-1, and the groove 4-1 is provided with an anti-skid clamping piece 4-2, which is also serm-circular with a groove with threads in the middle, Two semi-cylindrical grooves 4-1 are butted to form a circular through hole, and two anti-skid clamping pisces 4-2 are butted to form an anti-skid clamping insulator with threads inside, The end of the samples is fixed in the anti-slip clamping insulator, and the thread in the anti-slip clamping insulator can avoid the experimental error caused by the slippage of the sample in the clamping test process, Experimental error caused by slippage in the test process. In addition, by adjusting the inner diameter and inner groove diameter of the antiskid clamping insulator, the effective matching of different clamping sample diameters can be realized. By adjusting the distance between the fixed clamping plais 5 and the moving clamping plate 4, samples of different lengths can be adapisd. Therefore, the device is suitable for testing samples with multiple sizes and specifications.
in this embodiment, the lest range of sample diameter is Zmm-30mm: ; The length test range of the sample is 20mm-500mm. in this embodiment, both the fixed clamping plate 5 and the moving clamping plate 4 are made of insulating, wear-resistant and high-strength plastics, and the used plastics include polyamide (PA), polyphenylens sulfide (PPS), polyethereiherketons (PEEK), epoxy plate, ste The sample stretching part is arranged at the other end of the frame 1. The sample strefohing part comprises 3 screw rod and 8 moving plate 3 matched with the screw rod 2 through threads, After the screw rod 2 passes through the fixed plate at the end of the frame 1, it is connected with the moving plate 3 through threads, The moving plate 165 passes through two cylindrical rods of the frame 1, and at the same time, the moving plais 3 is also provided with a through hole matched with the lead screw 2, and the through hole is internally provided with threads; The moving plate 3 and the moving clamping plate 4 are hard connected through the cooperation of the connecting beam 6 and the nut.
The screw 2 is provided with a handwheel and the handwhseei is provided with a handle to rotate the screw 2 by shaking the handle; it is also possible to drive the screw 2 to rotais automatically by driving the motor.
The screw fixing nut set contains two nuts, including threads, which are the same as the thread and specification of the screw, and the outside is completely matched with the rit fixing ring reserved on the frame 1 of the strain console.
In this embodiment, the pitch range of the encryption ball screw 2 Is any value betwesn
0.5 mm and 20 mm, and the direction of the handwhee! of the precision ball screw is adjusted by the handle to realize different directions of tensile stress and compressive stress, The rotation of that lead screw 2 drive the moving plate 3 to move, and through the positive and negative rotation of the handle, the moving plate 3 can move towards the moving clamping plate 4 or away from the moving clamping plate 4, Stretching and compression of the sample are realized by the movement of the moving clamping plate 4.
During the test, the sample is placed in the fixed clamping piate 5 and the movable clamping plate 4. After being assembled and fixed, a high-precision strain measuring extensometer 7 is clamped on the sample, and the high-precision strain measuring extensometer 7 is connected with a high-precision strain measuring extensometer data reading computer S through a data cable 8 Two ends of the sample are respectively provided with electrodes 10, the lead wires 11 from the electrodes 10 are connected with a resistance test multimeter 12, and the resistance test multimeter 12 is connecisd with a multimeter data reading computer 12 through data lings.
Turn the handwheel with the handle at a constant speed, slowly tum the screw 2, and when the screw 2 is turned forward, the sample can be streiched, When the screw 2 18 rotated reverseiy, the sample can be compressed; In the process of rotation, the strain values is calculated by reading the deformation data of extensometer, When the strain value reaches the designated corresponding strain position, the corresponding resistance value is read and recorded by muitimeter software, and then the lead screw 2 is continuons 99 rotated to collect and measure other data, Embodiment 2 In one or more embodiment, this invention provides a method for testing rhicro-strain-resistance response under tension and compression state, which comprises that following step: Two ends of the sample to be measured are clamped and fixed by the fixed clamping piece and the movable clamping piece respectively, When streiching the sample, turn the screw in the set direction to make the moving part move away from the sample clamping part The movement of the Moving piece drives the moving clamping piece to move in the same direction, thus reslizing the streiching of the sample to be measured, in the process of stretching, the strain data is measured by the sample strain measuring extensometer; The resistance value is measured by the sample resistance measuring device, and the corresponding relationship between the strain data and the resistance value is obtained.
When compressing the sample, rotate the screw in the opposite direction, so that the moving part moves to the direction close to the sample clamping part The movement of the moving piece drives the moving clamping piece to move in the same direction, thereby realizing the compression of the sample Io be tested; in the process of compression, the strain data is measured by the sample strain measuring extensometer; The resistance value is measured by the sample resistance measuring device, and oblaining the corresponding relationship between the strain data and the resistance value.
Although the specific embodiments of the present invention have been described above in conjunction with the attached drawings, it is not a limitation on the scope of protection of the present invention, Those skilled in the field should understand that on the basis of the technical scheme of the present invention, various modifications or deformations that can be made by those skilled in the field without creative efforts are still within the scope of protection of the present invention.
; ; ; LU501651
1. frame, 2. screw, 3 moving plate, 4 moving clamping plate, 4-1, groove, AS anti-skid clamping piece, 5, fixed clamping plate, 6. connecting beam, 7. strain measuring extensometer, 8 dala cable, 9. strain measuring extensometer data reading computer, 10. electrode, 11. wire, 12. multimeter, 13. multimeter data reading computer

Claims (9)

  1. Claims
    1. Device for testing micro-sfrain-resistance response under tension and compression state is characterized in comprising strain console, sample strain measuring extensometer and sample resistance measuring device; the strain control console comprises a frame, wherein a sample clamping part and a sample stretching part are respectively arranged on the frame; the sample stretching part is connected with the sample clamping part, and the stretching of the sample stretching part can drive the sample clamping part to streich, thereby realizing the stretching of the sample, the sample strain measuring extensometer and the sample resistance measuring device are respectively in contact with the sample to measure the strain and resistance of the sample under tension and compression, 2 Device for testing micro-strain-resistance response under tension and compression state, according to claim 1, is characterized in that the sample clamping part comprises a fixed clamping piece and a movable clamping piece which are arranged on the frame; the fixed clamping piece is fixed at the end of the frame, and the movable clamping piece can move relative to the fixed clamping piece on the frame, clamping paris for carrying and tightening samples are arranged on the fixed clamping piece and the movable clamping piece.
    3. Device for testing micro-strain-resistance response under tension and compression state, according to claim 2, Is characterized in that the clamping partis a through hole formed by butting two semicircular grooves, and an insulating clamping piece formed by butting two semicircular grooves with intemal threads is arranged in the through hole,
    4. Device for testing micro-strain-resistance response under tension and compression state, according to claim 2, is characterized in that the moving clamp and the fixed clamp are made of plastics, and the plastics include polyamide, polyphenyiene suifide, poiyetherstherketone and epoxy plate,
    5. Device for testing micro-strain-resisiance response under tension and compression state, according to claim 1, is characterized in that the sample stretching part is arranged at the other end of the rack; the stretching part comprises a lead screw and a moving piece maiched with the lead screw through threads, the rotation of that lead screw drive the moving part to move towards the sample clamping part 201651 away from the sample clamping part, the moving part Is hard connected with the sample clamping part.
    8. Device for testing rmicro-strain-resistance response under tension and compression stats is characterized in that the piton range of the screw rod is
    0.5mm-20mm.
    7. Device for lesting migro-straineresistance response under tension and compression stale is characterized in that the sample strain measuring extensometer is connected with a computer through a data line, two ends of the sample ars connected with electrodes, and the slectrodes are connected with a resistance test multimeter through wires.
    & Method for testing micro-atrain-resisiance response under tension and compression state is characterized in comprising wo ends of the sample to be measured are clamped and fixed by the fixed clamping piece and the movabls clamping piece respectively, when stretching the sample, turn the screw in the sel direction to make the moving part move away from the sample clamping part, the movement of the moving piece drives the moving clamping piece to move in the same direction, thereby realizing the stretching of the sample to be measured; in the process of stretching, the strain data is measured by the sample strain measuring extensometer, the resistance value is measured by the sample resistance measuring device, and obtaining the corresponding relationship between the strain data and the resistance value.
    ©. Method for testing micro-atrain-resisiance response under tension and compression stale is characterized in comprising the following steps. when compressing the sample, rotate the screw in the opposite direction, so that the moving part moves to the direction Close to the sample clamping part: the movement of the moving piece drives the moving clamping piece to move in the same direction, thereby realizing the compression of the sample to be tested: in the process of compression, the strain data is measured by the sample strain measuring exiensomeler, the resistance value is measured by the sample resistance measuring device, and
    _. ; ; ; ; ._, LU501651 obtaining the corresponding relationship bebween ithe strain data and the resistance vaiue.
LU501651A 2022-03-11 2022-03-11 Device and method for testing micro-strain-resistance response under tension and compression state LU501651B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
LU501651A LU501651B1 (en) 2022-03-11 2022-03-11 Device and method for testing micro-strain-resistance response under tension and compression state

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU501651A LU501651B1 (en) 2022-03-11 2022-03-11 Device and method for testing micro-strain-resistance response under tension and compression state

Publications (1)

Publication Number Publication Date
LU501651B1 true LU501651B1 (en) 2022-09-12

Family

ID=83231034

Family Applications (1)

Application Number Title Priority Date Filing Date
LU501651A LU501651B1 (en) 2022-03-11 2022-03-11 Device and method for testing micro-strain-resistance response under tension and compression state

Country Status (1)

Country Link
LU (1) LU501651B1 (en)

Similar Documents

Publication Publication Date Title
WO2021217719A1 (en) Elasticity modulus meter
CN103698212B (en) A kind of the coefficient of normal anisortopy Direct Determination of tubing hoop
CN206710282U (en) A kind of mechanics test device suitable for small-sized berry
CN103163016A (en) Auxiliary device for carrying out axial tension test on quasi brittle materials
LU501651B1 (en) Device and method for testing micro-strain-resistance response under tension and compression state
CN107505213B (en) Novel small punch test device and test method thereof
CN100487415C (en) Method for measuring polymer-base foam material elastic modulus by displacement sensor
CN218240263U (en) Conductivity detector for battery electrode
CN110672413A (en) Micro strain-resistance response testing device and method used in tension and compression state
CN109297809A (en) A kind of device and measurement method measuring bolt clamping force
CN114325109B (en) Method for measuring conductivity of cylindrical crystal bar
CN214010918U (en) High-precision servo hydraulic equipment for detecting civil materials
CN205665298U (en) High voltage measurement emplacement machinery hand device
CN211877620U (en) Electronic universal material testing machine
CN107658484B (en) Single cell assembling device for fuel cell
CN204405444U (en) A kind of tension tester
CN210664324U (en) Hydrogel strain sensor testing device
CN110806359A (en) Rubber fatigue tensile strength detection device
CN213456433U (en) Tension-torsion composite loading device for superconducting strip at low temperature
CN219235149U (en) Portable pipeline nondestructive test device
CN219657391U (en) Bar bending strength detection device
CN218200524U (en) Slide rail device for batch test
CN217542212U (en) Plastic product automatic checkout device
CN220437652U (en) Calibrating device based on pressure sensor
CN219977717U (en) Sheet spring force measuring device convenient to clamp

Legal Events

Date Code Title Description
FG Patent granted

Effective date: 20220912