CN112857989B - Device for testing in-situ mechanical properties of pipe under service working condition - Google Patents
Device for testing in-situ mechanical properties of pipe under service working condition Download PDFInfo
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- CN112857989B CN112857989B CN202110147738.0A CN202110147738A CN112857989B CN 112857989 B CN112857989 B CN 112857989B CN 202110147738 A CN202110147738 A CN 202110147738A CN 112857989 B CN112857989 B CN 112857989B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
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- 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
- G01N2203/0019—Compressive
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- 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
- G01N2203/005—Electromagnetic means
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- 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
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
- G01N2203/0082—Indentation characteristics measured during load
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Abstract
The invention belongs to the technical field of precise scientific instruments, and particularly relates to a device for testing in-situ mechanical properties of a pipe under a service working condition. The device comprises a precision indentation detection unit, an in-situ online observation unit and a pipeline fixing and supporting platform; the precise indentation detection unit is fixed on the pipeline fixing and supporting platform; the in-situ online observation unit is arranged on one side of the pipeline fixing and supporting platform. The indentation test method can realize indentation test under the service condition, accurately solve mechanical parameters such as material hardness, elastic modulus, yield strength, residual stress, fracture toughness and the like, and can obtain optical microscopic images such as deformation damage, microstructure change and the like of the material in the test process, thereby providing an effective means and method for the micromechanical property test of the material under the service condition.
Description
Technical Field
The invention belongs to the technical field of precise scientific instruments, and particularly relates to a device for testing in-situ mechanical properties of a pipe under a service working condition.
Background
The indentation technology is a technology for loading the surface of a material through a diamond pressure head, measuring an indentation area and obtaining a load-displacement curve to analyze and evaluate the performance of the material. The technology is based on elasticity mechanics, a curve is measured through experiments, the elastic modulus can be calculated from an unloading curve, the hardness value can be calculated according to the maximum loading load and the contact area, and parameters such as creep deformation, residual stress, fracture toughness and the like can be calculated. The method comprises the steps of mechanically pressing a pressure machine provided with a diamond pressure head into the surface of a test piece, recording the magnitude of applied pressure and the magnitude of displacement of the diamond pressure head by a material under the diamond pressure head in the pressure test process, recording the time information of the applied pressure, and finally obtaining a group of corresponding functions related to the experimental force and the corresponding indentation experimental depth, wherein an indentation tester detects the mechanical properties of the material through a non-destructive method, such as the hardness, the yield strength, the residual stress and the like of the material, so that the service life evaluation, the failure analysis and the fatigue aging evaluation are carried out on the material. By utilizing a characteristic stress-strain method, a multi-cycle load-depth curve obtained by an indentation test is converted into a true stress-strain curve, so that the yield strength, the strain hardening index, the elastic modulus and the tensile strength of the metal material can be determined.
With the development of material surface topography observation and internal structure detection technology, the research on material failure modes and mechanisms and internal micro-nano structures mainly depends on various microscopic imaging equipment and analysis and detection equipment. The traditional material testing machine is large in size and inconvenient to integrate with other equipment, so that the application range of the traditional material testing machine is limited, and a material in-situ mechanical property testing technology capable of simultaneously obtaining performance parameters and microscopic morphology information of a material is promoted. The in-situ testing technology is used for continuously monitoring and analyzing the mechanical property of a tested piece on line, the mechanical property testing technology is combined with the electron microscopic imaging technology, the microstructure change of the material under the action of force is dynamically monitored by the microscopic imaging equipment while the mechanical property of the material is tested, the tested sample can be continuously observed and analyzed on line, the testing information can be observed more visually, and the deformation and damage mechanism of the material can be deeply researched. By means of the auxiliary observation and positioning function of the microscopic imaging instrument, the in-situ indentation testing technology also shows the advantages of the in-situ indentation testing technology on the mechanical property research of test pieces such as a nanotube, a column tube and the like.
In the industries of electric power, oil gas, chemical industry and the like, due to the limitations of design technologies, construction conditions and the like, surface materials of electric power pipelines, petroleum pipelines, gas pipelines, large-scale tanks and the like on a part of a site can generate damages such as deformation, corrosion and the like after long-time operation, so that the corrosion condition of the pipelines needs to be known in time. However, the existing in-situ test equipment is generally arranged in a laboratory to test the mechanical properties of a material sample under a composite load, has a large volume, and is not suitable for being carried outdoors, so that an in-situ test device which is convenient to carry and can carry out a test on site is needed.
Disclosure of Invention
The invention provides a simple-structure device for testing the in-situ mechanical properties of a pipe under a service working condition, which can realize an indentation test on site, accurately solve mechanical parameters such as hardness, elastic modulus, yield strength, residual stress, fracture toughness and the like of the material, and can obtain optical microscopic images such as deformation damage, microstructure change and the like of the material in the test process, thereby providing an effective means and method for testing the micromechanical properties of the material under the service condition and solving the problems of the existing in-situ test device.
The technical scheme of the invention is described as follows by combining the attached drawings:
an in-situ indentation online testing device comprises a precision indentation detection unit 1, an in-situ online observation unit 2 and a pipeline fixing and supporting platform 3; the precision indentation detection unit 1 is fixed on the pipeline fixing and supporting platform 3; the in-situ online observation unit 2 is arranged on one side of the pipeline fixing and supporting platform 3.
The precision indentation detection unit 1 comprises an outer shell 101, a PLC102, a direct current brushless motor 103, a motor driver 104, a speed reducer 105, a coupler 106, a lead screw module 107, a T-shaped block 108, a lifting rod 109, a pressure sensor 110, a displacement sensor 111, a sensor connecting block 112 and a diamond pressure head 113; the PLC102 is fixed at the upper end of the outer shell 101; the direct current brushless motor 103 is connected with a motor driver 104; the upper end of the motor driver 104 is connected with the PLC102 and fixed on the outer shell 101; the PLC102 is connected with a motor driver 104; the lower shaft end of the direct current brushless motor 103 is connected with a speed reducer 105; the lower shaft end of the speed reducer 105 is connected with the upper shaft end of the screw rod module 107 through a coupler 106; the sliding block of the screw rod module 107 is fixed with the T-shaped block 108; the upper end of the lifting rod 109 is provided with a groove block fixed with the T-shaped block 108; the lower end of the lifting rod 109 is connected with a pressure sensor 110; the lower end of the pressure sensor 110 is connected with a diamond pressure head 113; a sensor connecting block 112 is sleeved in the middle of the lifting rod 109; a displacement sensor 111 is arranged on the sensor connecting block 112; the bottom end of the displacement sensor 111 and the head of the diamond pressure head 113 are positioned on the same horizontal plane; the lower end of the outer shell 101 is fixed on the pipeline fixing and supporting platform 3.
The in-situ online observation unit 2 comprises a continuous zoom microscope 201, a CCD camera 202, an auxiliary light supplement lamp 203, a servo motor, a ball screw rod die 204 and a supporting seat; the continuous zoom microscope 201 and the auxiliary light supplement lamp 203 are respectively arranged on two sides of the main axis of the testing device; the servo motor and the ball screw rod die 204 are fixed on the pipeline fixing and supporting platform 3; the CCD camera 202 is fixed on a slide block at the upper end of the continuous zoom microscope 201; the continuous zoom microscope 201 is fixed on a slide block of the ball screw rod die 204; the auxiliary light supplement lamp 203 is fixed on the pipeline fixing and supporting platform 3; the servo motor is connected to the ball screw die 204.
The pipeline fixing and supporting platform 3 comprises an upper supporting seat 301, a lower adsorption base 302 and four electric telescopic rods 303 connected in the middle; the lower ends of the four electric telescopic rods 303 are fixed with the lower adsorption base 302; the top ends of the two electric telescopic rods 303 positioned on one side of the continuous zoom microscope 201 and the ball screw rod die 204 are respectively fixed with a baffle, the upper ends of the two electric telescopic rods 303 positioned on the other side are fixed with a long baffle, and the top ends of the two electric telescopic rods 303 are connected; the baffle and the long baffle are fixed on the upper support base 301; four electric telescopic handle 303 forms the dovetail groove that is used for the fixed pipeline of centre gripping.
Magnetic force seats are arranged on the upper supporting seat 301 and the lower adsorption base 302; a circular hole is formed in the center of the upper supporting seat 301.
The electric telescopic rod 303 comprises an outer telescopic rod and an inner telescopic rod; the inner telescopic rod is arranged in the outer telescopic rod; the inner telescopic rod is in threaded fit with the screw rod; the bottom of the outer telescopic rod is provided with a stepping motor; the stepping motor is arranged in the lower adsorption base 302; and an output shaft at the upper end of the stepping motor is fixedly connected with the bottom of the screw rod through a coupler.
The PLC102 is a touch screen PLC.
The displacement sensor 111 is an LVDT pen type displacement sensor.
The continuous zoom microscope 201 is a Leica M205C encoded microscope lens.
A fluorescent lamp ring is arranged outside the lens of the continuous zoom microscope 201.
The beneficial effects of the invention are as follows:
1) The invention has the function of accurately and stably testing materials under the working condition of service, has smaller volume, high positioning precision and quick response, can realize the test of oil gas pipelines, gas pipelines and the like in the engineering field or in the field so as to meet the quick requirements of engineering design, quality monitoring, performance checking and the like;
2) The invention can realize the rapid positioning of the in-situ observation module, and carry out in-situ observation on the deformation and damage of the surface appearance of the material in the test process through the continuous zoom microscope, thereby providing an effective means and method for the test of the micromechanics performance of the material under the service condition.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural diagram of a precision indentation detection unit according to the present invention;
FIG. 3 is a schematic structural diagram of an in-situ on-line observation unit according to the present invention;
fig. 4 is a schematic structural view of the pipeline fixing and supporting platform of the present invention.
In the figure:
1. a precision indentation detection unit; 2. an in-situ online observation unit; 3. the pipeline is fixed on the supporting platform; 101. an outer housing; 102. a PLC; 103. a DC brushless motor; 104. a motor driver; 105. a speed reducer; 106. a coupling; 107. a screw rod module; 108. a T-shaped block; 109. a lifting rod; 110. a pressure sensor; 111. a displacement sensor; 112. a sensor connecting block; 113. a diamond pressure head; 201. a continuous zoom microscope; 202. a CCD camera; 203. an auxiliary light supplement lamp; 204. a ball screw die; 301. an upper support base; 302. a lower adsorption base; 303. an electric telescopic rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the in-situ indentation online testing device comprises a precision indentation detection unit 1, an in-situ online observation unit 2 and a pipeline fixing and supporting platform 3; the precision indentation detection unit 1 is fixed on the pipeline fixing and supporting platform 3; the in-situ online observation unit 2 is arranged on one side of the pipeline fixing and supporting platform 3 and is used for recording the organization structure and the indentation morphology of the material to be detected in the indentation testing process. The in-situ online observation unit 2 and the pipeline fixing and supporting platform 3 can be independently detached or replaced by other bases for use.
Referring to fig. 2, the precision indentation detection unit 1 includes an outer casing 101, a PLC102, a dc brushless motor 103, a motor driver 104, a speed reducer 105, a coupler 106, a lead screw module 107, a T-shaped block 108, a lifting rod 109, a pressure sensor 110, a displacement sensor 111, a sensor connection block 112, and a diamond indenter 113; the PLC102 is fixed at the upper end of the outer shell 101; the direct current brushless motor 103 is connected with a motor driver 104; the upper end of the motor driver 104 is connected with the PLC102 and fixed on the outer shell 101; the precision indentation detection unit 1 is integrally controlled by a PLC; the PLC102 is connected with a motor driver 104; the lower shaft end of the direct current brushless motor 103 is connected with a speed reducer 105; the lower shaft end of the speed reducer 105 is connected with the upper shaft end of the screw rod module 107 through a coupler 106; the sliding block of the screw rod module 107 is fixed with the T-shaped block 108 through bolts; the upper end of the lifting rod 109 is provided with a groove block fixed with the T-shaped block 108; the lower end of the lifting rod 109 is connected with a pressure sensor 110; the lower end of the pressure sensor 110 is connected with a diamond pressure head 113; a sensor connecting block 112 is sleeved in the middle of the lifting rod 109; a displacement sensor 111 is arranged on the sensor connecting block 112; the bottom end of the displacement sensor 111 and the head of the diamond pressure head 113 are in the same horizontal plane, so that the test is facilitated; the lower end of the outer shell 101 is fixed on the pipeline fixing and supporting platform 3; the back of the screw rod module 107 is connected with a U-shaped steel, and the U-shaped steel is connected with the outer shell 101 through bolts, so that the whole device is fixed in the outer shell 101; the lower end of the outer shell 101 is fixed on the upper support seat 301 of the pipeline fixing and supporting platform 3 through bolts.
The PLC102 is a touch screen PLC all-in-one machine, and equipment can be conveniently debugged at the near end.
The displacement sensor 111 is an LVDT pen type displacement sensor.
Referring to fig. 3, the in-situ on-line observation unit 2 includes a zoom microscope 201, a CCD camera 202, an auxiliary fill light 203, a servo motor, a ball screw die 204, and a support base; the continuous zoom microscope 201 and the auxiliary light supplement lamp 203 are respectively arranged on two sides of the main axis of the testing device; the servo motor and the ball screw rod die 204 are fixed on the pipeline fixing and supporting platform 3 through bolts; the CCD camera 202 is fixed on a slide block at the upper end of the continuous zoom microscope 201 and is used for assisting the focusing of the microscope, and the macroscopic motion adjustment and the microscopic focusing driving are realized by adjusting the motion speed; the continuous zoom microscope 201 is fixed on a slide block of the ball screw rod die 204, so that the position of the continuous zoom microscope 201 can be remotely monitored for focusing; the auxiliary light supplement lamp 203 is fixed on the upper support seat 301 of the pipeline fixing and supporting platform 3, the brightness balance of each direction is ensured by adjusting the brightness of the auxiliary light supplement lamp 203, the influence of an external light source can be avoided, and light is automatically supplemented to observe a proper illumination environment; the servo motor is connected to the ball screw die 204.
The continuous variable magnification microscope 201 is carried out by adopting a Leica M205C coding microscope lens, and the comprehensive magnification can reach 160 times. The magnification and the position of the iris diaphragm of the continuous zooming microscope are transmitted to the software in real time, and the scale bars are displayed along with the real-time image and are synchronously updated when the magnification is changed. When the image is stored, the parameters are saved along with the image so as to be called at any time when needed in the future.
The outside of the lens of the continuous zoom microscope 201 comprises a fluorescent lamp ring which is convenient for focusing and focusing, and the brightness of the fluorescent lamp ring and the auxiliary light supplement lamp is adjustable.
Referring to fig. 4, the pipeline fixing and supporting platform 3 includes an upper supporting seat 301, a lower absorption base 302 and four electric telescopic rods 303 connected in the middle; the lower ends of the four electric telescopic rods 303 are fixed with the lower adsorption base 302; wherein, the top ends of the two electric telescopic rods 303 positioned at one side of the continuous zoom microscope 201 and the ball screw rod die 204 are respectively fixed with a baffle plate to prevent interference with the continuous zoom microscope 201; the upper ends of the two electric telescopic rods 303 positioned on the other side are fixed with long baffles, and the top ends of the two electric telescopic rods 303 are connected; the baffle and the long baffle are fixed on the upper supporting seat 301 through bolts; the four electric telescopic rods 303 form a trapezoidal groove for clamping and fixing a pipeline. The electric telescopic rod 303 is lifted and adjusted when testing pipelines with different diameters, so that the trapezoidal groove can clamp and fix the pipelines;
go up the supporting seat 301 and adsorb down and all be provided with the magnetic force seat on the base 302, open the magnetic force seat and can reach the better adsorption effect to the pipeline when test metal class tubular product.
The center of the upper supporting seat 301 is provided with a circular hole, so that the diamond indenter 113 and the displacement sensor 111 in the precise indentation testing unit 1 can conveniently penetrate through the upper supporting seat to contact the tested pipeline, and the cavity structure of the upper supporting seat provides a good visual angle for in-situ observation of the contact action area of the tested pipeline and the diamond indenter 113.
The electric telescopic rod 303 comprises an outer telescopic rod and an inner telescopic rod; the inner telescopic rod is arranged in the outer telescopic rod; the inner telescopic rod is in threaded fit with the screw rod; the bottom of the outer telescopic rod is provided with a stepping motor; the stepping motor is arranged in the lower adsorption base 302; and an output shaft at the upper end of the stepping motor is fixedly connected with the bottom of the screw rod through a coupler. The screw rod is driven by the stepping motor to rotate, so that the inner telescopic rod is driven to ascend or descend.
The zoom microscope 201 is a Leica M205C encoded microscope lens.
A fluorescent lamp ring is arranged outside the lens of the continuous zoom microscope 201.
The working process of the invention is as follows:
when testing a target pipe, firstly separating an upper supporting seat 301 and a lower adsorption base 302 of a pipeline fixing and supporting platform 3; the lower adsorption base 302 is placed under a pipeline, the upper supporting seat 301 is connected to the lower adsorption base 302 through a baffle plate on the electric telescopic rod 303, the length of the electric telescopic rod 303 is adjusted to enable the trapezoidal grooves of the upper supporting seat 301 and the lower adsorption base 302 to tightly clamp and fix the pipeline, and the magnetic seat in the trapezoidal groove can be opened for the metal pipe, so that the pipelines with different pipe diameters and different positions can be fixed; after the device is fixed to a tested area, firstly, the precision indentation testing unit 1 is operated, the motor driver 104 is controlled by the PLC102 to drive the direct current brushless motor 103 to rotate, the torque is improved by the speed reducer 105 to drive the slide block of the screw rod module 107 to lift, and the T-shaped block 108 and the lifting rod 109 fixed on the slide block are driven to lift; when the diamond pressure head 113 is close to the surface of the measured pipeline, the pressure sensor 110 judges the registration change to be in contact with the measured surface, then the load is measured by pressing in, and meanwhile, the displacement sensor 111 is in contact with the measured surface and generates linear telescopic deformation, so that the pressing-in depth value in the indentation process can be obtained; the two readings are collected into the PLC102 in real time and are remotely sent to the notebook software through the DTU module, so that a curve of the relation between the press-in load and the depth is drawn, and the parameters such as the hardness and the elastic modulus of the material can be calculated conveniently; in the indentation test process, the motor and the slide block of the ball screw rod die 204 are controlled to move according to the real-time image of the CCD camera 202, so that the position of the continuous zoom microscope 201 is adjusted to be convenient for focusing to the tested surface, meanwhile, the brightness of the auxiliary light supplement lamp 203 at the opposite side is adjusted, the brightness balance of all directions is ensured, the influence of an external light source can be avoided, and light is automatically supplemented to observe a proper illumination environment; and finally, recording the in-situ indentation process of the loading and unloading process in real time by using the continuous zoom microscope 201, wherein the in-situ indentation process comprises the organizational structure and the indentation morphology of the material to be detected, and facilitating subsequent analysis. The whole test process is simple, the measurement result is accurate, and the measurement precision of the hardness and the elastic modulus is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A device for testing the in-situ mechanical property of a pipe under a service working condition is characterized by comprising a precise indentation detection unit (1), an in-situ online observation unit (2) and a pipeline fixing and supporting platform (3); the precise indentation detection unit (1) is fixed on the pipeline fixing and supporting platform (3); the in-situ online observation unit (2) is arranged on one side of the pipeline fixing and supporting platform (3);
the precision indentation detection unit (1) comprises an outer shell (101), a PLC (programmable logic controller) (102), a direct-current brushless motor (103), a motor driver (104), a speed reducer (105), a coupler (106), a screw rod module (107), a T-shaped block (108), a lifting rod (109), a pressure sensor (110), a displacement sensor (111), a sensor connecting block (112) and a diamond pressure head (113); the PLC (102) is fixed at the upper end of the outer shell (101); the direct current brushless motor (103) is connected with a motor driver (104); the upper end of the motor driver (104) is connected with the PLC (102) and is fixed on the outer shell (101); the PLC (102) is connected with a motor driver (104); the lower shaft end of the direct current brushless motor (103) is connected with a speed reducer (105); the lower shaft end of the speed reducer (105) is connected with the upper shaft end of the screw rod module (107) through a coupler (106); a sliding block of the screw rod module (107) is fixed with the T-shaped block (108); the upper end of the lifting rod (109) is provided with a groove block which is fixed with the T-shaped block (108); the lower end of the lifting rod (109) is connected with a pressure sensor (110); the lower end of the pressure sensor (110) is connected with a diamond pressure head (113); a sensor connecting block (112) is sleeved in the middle of the lifting rod (109); a displacement sensor (111) is arranged on the sensor connecting block (112); the bottom end of the displacement sensor (111) and the head part of the diamond pressure head (113) are positioned on the same horizontal plane; the lower end of the outer shell (101) is fixed on the pipeline fixing and supporting platform (3);
the in-situ online observation unit (2) comprises a continuous zoom microscope (201), a CCD camera (202), an auxiliary light supplement lamp (203), a servo motor, a ball screw rod die (204) and a supporting seat; the continuous zoom microscope (201) and the auxiliary light supplement lamp (203) are respectively arranged on two sides of the main axis of the testing device; the servo motor and the ball screw rod die (204) are fixed on the pipeline fixing and supporting platform (3); the CCD camera (202) is fixed on a slide block at the upper end of the continuous zoom microscope (201) and used for assisting the focusing of the microscope, and the macroscopic motion adjustment and the microscopic focusing driving are realized by adjusting the motion speed; the continuous zoom microscope (201) is fixed on a slide block of the ball screw rod die (204); an auxiliary light supplement lamp (203) is fixed on the pipeline fixing and supporting platform (3);
the pipeline fixing and supporting platform (3) comprises an upper supporting seat (301), a lower adsorption base (302) and four electric telescopic rods (303) connected in the middle; the lower ends of the four electric telescopic rods (303) are fixed with the lower adsorption base (302); the top ends of the two electric telescopic rods (303) positioned on one side of the continuous zoom microscope (201) and the ball screw rod die (204) are respectively fixed with a baffle, the upper ends of the two electric telescopic rods (303) positioned on the other side are fixed with a long baffle, and the top ends of the two electric telescopic rods (303) are connected; magnetic force seats are arranged on the upper supporting seat (301) and the lower adsorption base (302); a circular hole is formed in the center of the upper support seat (301), and the baffle and the long baffle are fixed on the upper support seat (301); the four electric telescopic rods (303) form a trapezoid groove for clamping and fixing the pipeline; the electric telescopic rod (303) comprises an outer telescopic rod and an inner telescopic rod; the inner telescopic rod is arranged in the outer telescopic rod; the inner telescopic rod is in threaded fit with the screw rod; the bottom of the outer telescopic rod is provided with a stepping motor; the stepping motor is arranged in the lower adsorption base (302); an output shaft at the upper end of the stepping motor is fixedly connected with the bottom of the screw rod through a coupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110147738.0A CN112857989B (en) | 2021-02-03 | 2021-02-03 | Device for testing in-situ mechanical properties of pipe under service working condition |
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| CN202110147738.0A CN112857989B (en) | 2021-02-03 | 2021-02-03 | Device for testing in-situ mechanical properties of pipe under service working condition |
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| CN112857989B true CN112857989B (en) | 2022-11-25 |
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| CN114088556B (en) * | 2021-11-01 | 2023-05-16 | 清华大学 | Sealing element testing device |
| CN114155624B (en) * | 2021-11-26 | 2023-10-24 | 湖南华菱湘潭钢铁有限公司 | Construction method of stress digital twin body of rolling coupler |
| CN115791426B (en) * | 2023-02-07 | 2023-04-11 | 四川炬原玄武岩纤维科技有限公司 | Basalt fiber composite pipe pressure testing device and method |
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