CN110618048A - Bellows simulation fatigue test device and test method thereof - Google Patents
Bellows simulation fatigue test device and test method thereof Download PDFInfo
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- CN110618048A CN110618048A CN201910897902.2A CN201910897902A CN110618048A CN 110618048 A CN110618048 A CN 110618048A CN 201910897902 A CN201910897902 A CN 201910897902A CN 110618048 A CN110618048 A CN 110618048A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a corrugated pipe simulation fatigue test device which comprises a bottom plate, a motion simulation mechanism and a force measuring mechanism, wherein the motion simulation mechanism comprises a rack fixed on the bottom plate, a carriage capable of sliding relative to the bottom plate, a gear positioned above the rack and meshed with the rack, and a driving mechanism fixed on the carriage, and an output shaft of the driving mechanism is fixedly connected with a central shaft of the gear; the force measuring mechanism comprises a sensor sliding support plate, a sensor fixing support plate and a force measuring sensor, wherein the sensor sliding support plate is in sliding connection with the bottom plate, the sensor fixing support plate is fixed above the bottom plate, one side of the sensor sliding support plate is provided with a clamp so as to be fixedly connected with the other end of the sample, and two ends of the force measuring sensor are respectively connected with the sensor fixing support plate and the sensor sliding support plate. The simulation fatigue test device for the corrugated pipe can truly simulate the test of fatigue damage caused by annual or annual temperature fluctuation of parts such as the corrugated pipe and the like so as to research the fatigue damage mechanism and fatigue life prediction of the corrugated pipe.
Description
Technical Field
The invention relates to the technical field of strain fatigue test of power equipment, in particular to a corrugated pipe simulation fatigue test device and a test method thereof.
Background
The expansion joint of the metal corrugated pipe of the GIS (GAS insulated SWITCHGEAR) device is a basic device which is used for connecting two pipelines on electrical equipment, is mainly used for compensating displacement caused by thermal expansion and cold contraction, absorbing energy caused by axial vibration during operation and the like, and has the action effect similar to a spring, so that the metal corrugated pipe is a key part for ensuring the whole electrical safety and service life in industrial application.
The metal corrugated pipe expansion joint of the GIS equipment generally comprises the following components: corrugated pipe, connecting pipe, backing ring, flange, screw bolt, nut and other parts. Wherein the bellows is the core component and also the deformation component. The metal corrugated pipe is mostly made of austenitic stainless steel, the metal corrugated pipe can be subjected to cyclic load action in actual working conditions, but stress of each part of the metal corrugated pipe is not uniform, stress of some local areas is concentrated and often located in a plastic stress area, and therefore fatigue damage is likely to occur under low cycle times, and the metal corrugated pipe belongs to a typical low-cycle large-strain fatigue part. Therefore, the method has important practical significance and practical guidance for simulating and researching the actual stress state, the material damage mechanism and the fatigue damage test method of the corrugated pipe.
The stress-strain conditions of the corrugated pipe can be completely different when the temperature difference changes all the year round, and the stress-strain conditions can be completely different in the daytime and at night within one day, so that the invention designs a test device which can truly simulate the fatigue damage test of the corrugated pipe caused by the temperature changes all the year round and at night in the daytime, and has important practical significance for researching the stress state, the fatigue damage mechanism and the fatigue life prediction of the corrugated pipe.
Disclosure of Invention
The invention mainly aims to provide a corrugated pipe simulation fatigue test device and a test method thereof, aiming at truly simulating the test of fatigue damage caused by annual or all-day temperature fluctuation of parts such as a corrugated pipe and the like so as to research the fatigue damage mechanism and fatigue life prediction of the corrugated pipe.
In order to achieve the above object, the present invention provides a bellows simulation fatigue test apparatus, which comprises a bottom plate, and a motion simulation mechanism and a force measurement mechanism mounted on the bottom plate, wherein,
the motion simulation mechanism comprises a rack fixed on the bottom plate, a dragging plate which is arranged above the bottom plate and can slide relative to the bottom plate, a gear which is positioned above the rack and is meshed with the rack, and a driving mechanism fixed on the dragging plate, wherein an output shaft of the driving mechanism is fixedly connected with a central shaft of the gear, and a clamp is arranged on the dragging plate to be fixedly connected with one end of a sample;
the force measuring mechanism comprises a sensor sliding support plate which can slide relative to the bottom plate, a sensor fixing support plate fixed above the bottom plate and a force measuring sensor, wherein a clamp is installed on one side of the sensor sliding support plate to be fixedly connected with the other end of the sample, and two ends of the force measuring sensor are respectively connected with the sensor fixing support plate and the sensor sliding support plate.
Preferably, the driving mechanism comprises a motor and a speed reducer which are fixed on the carriage, an output shaft of the motor is connected with the speed reducer, and an output shaft of the speed reducer is fixedly connected with a central shaft of the gear.
Preferably, the motion simulation mechanism further comprises a gear support plate fixed on the carriage, and a central shaft of the gear is erected on one side of the gear support plate and fixedly connected with an output shaft of the speed reducer.
Preferably, the speed reducer is an L-shaped speed reducer, an output shaft of the speed reducer is coaxially arranged with a central shaft of the gear, the output shaft of the speed reducer is perpendicular to an output shaft of the motor, and a length direction of the rack is parallel to the output shaft of the motor.
Preferably, the motion simulation mechanism further comprises a clamp fixing plate fixed on the carriage, and a clamp is mounted at one end, facing the sample, of the clamp fixing plate.
Preferably, a convex guide rail is installed above the bottom plate, and a sliding groove at the bottom end of the carriage is clamped on the guide rail and is in sliding connection with the guide rail.
Preferably, the force measuring mechanism further comprises a force measuring sensor support table fixed above the bottom plate, the upper portion of the force measuring sensor support table is in sliding connection with the sensor sliding support plate through the guide rail sliding block, and the sensor fixing support plate is fixed on the force measuring sensor support table.
Preferably, two sensor sliding support plate slide rails are arranged on the force measuring sensor support platform, a guide rail slide block is fixed at each of two ends of the lower portion of the force measuring sensor support platform, and a clamping groove of each guide rail slide block is clamped on each sensor sliding support plate slide rail.
Preferably, both ends of the force measuring sensor are connected with the sensor fixing support plate and the sensor sliding support plate through bolts; the force sensor is an S-shaped force sensor.
The invention further provides a test method based on the corrugated pipe simulation fatigue test device, which comprises the following steps:
installing displacement and load monitoring equipment on a corrugated pipe use site, collecting displacement data and a load map of the corrugated pipe in a preset time period on the site, and processing the load map of the corrugated pipe in the preset time period to convert the load map into control pulses of a driving mechanism;
fixing two ends of the sample with a clamp, and adjusting the force measuring sensor to reach an initial state;
and electrifying the driving mechanism, setting a preprocessed control pulse to control the output power of the driving mechanism, driving the planker to move according to a set frequency by meshing the gear and the rack, stretching and loosening the sample under the clamping of the clamps at the two ends, performing reciprocating motion, and recording the data of the force measuring sensor in the operation process.
The corrugated pipe simulation fatigue test device provided by the invention provides power and control through the driving mechanism, realizes various periodic reciprocating motions required by the experiment through the matching of the components such as the gear, the rack, the carriage and the like, can truly simulate the test of fatigue damage caused by annual or annual temperature fluctuation of the components such as the corrugated pipe and the like, and is convenient for researching the stress state of the corrugated pipe, the fatigue damage mechanism, the fatigue life prediction and the like. The reciprocating motion of the carriage driving the sample can simulate the change of the material size caused by the temperature in any time period. Meanwhile, the load state in the test process of the sample can be obtained through the force transducer, and the fatigue mechanism of the sample can be researched and the fatigue life can be predicted. The corrugated pipe simulation fatigue test device is simple in structure and safe to operate, can realize tests on various samples such as corrugated pipes and springs, is low in cost and is easy to popularize.
Drawings
FIG. 1 is a schematic perspective view of a bellows fatigue test device according to the present invention;
FIG. 2 is a schematic structural view of a bellows simulation fatigue test device according to the present invention;
FIG. 3 is a left side view schematic structural diagram of the bellows simulation fatigue test apparatus of the present invention;
FIG. 4 is a schematic top view of the fatigue testing apparatus for corrugated pipe simulation according to the present invention;
fig. 5 is a schematic structural diagram of a motion simulation mechanism in the bellows simulation fatigue test device of the present invention.
In the figure, 1-a bottom plate, 2-a sensor fixing support plate, 3-a lengthened bolt, 4-a force transducer, 5-a sensor sliding support plate slide rail, 6-a sensor sliding support plate, 7-a clamp, 8-a sample, 9-a clamp fixing plate 9, 10-a speed reducer, 11-a motor, 12-a carriage, 13-a rack, 14-a gear, 15-a gear support plate 15, 16-a guide rail and 17-a force transducer support platform.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a corrugated pipe simulation fatigue test device.
Referring to fig. 1 to 5, in the preferred embodiment, a bellows simulation fatigue test apparatus includes a base plate 1, and a motion simulation mechanism and a force measurement mechanism mounted on the base plate 1, wherein,
the motion simulation mechanism and the force measuring mechanism are respectively positioned at two ends of the bottom plate 1, the motion simulation mechanism comprises a rack 13 (the rack 13 can be fixed on the bottom plate 1 through bolt connection) fixed on the bottom plate 1, a dragging plate 12 which is arranged above the bottom plate 1 and can slide relative to the bottom plate, a gear 14 which is positioned above the rack 13 and is meshed with the rack, and a driving mechanism fixed on the dragging plate 12, an output shaft of the driving mechanism is fixedly connected with a central shaft of the gear 14, and a clamp 7 is arranged on the dragging plate 12 and is fixedly connected with one end of a sample 8;
referring to fig. 1 and 2, the force measuring mechanism includes a sensor sliding support plate 6 slidable with respect to the base plate 1, a sensor fixing support plate 2 fixed above the base plate 1, and a load cell 4, wherein a clamp 7 is installed at one side of the sensor sliding support plate 6 to be fixedly connected with the other end of the sample 8, and both ends of the load cell 4 are respectively connected with the sensor fixing support plate 2 and the sensor sliding support plate 6.
Specifically, referring to fig. 5, the driving mechanism includes a motor 11 (adopting a servo motor) fixed on the carriage 12 and a speed reducer 10, an output shaft of the motor 11 is connected with the speed reducer 10, and an output shaft of the speed reducer 10 is fixedly connected with a central shaft of a gear 14.
Referring to fig. 3 and 5, the motion simulation mechanism further includes a gear support plate 15 fixed on the carriage 12, and a central shaft of the gear 14 is erected on one side of the gear support plate 15 and fixedly connected with an output shaft of the speed reducer 10. The speed reducer 10 is an L-shaped speed reducer, an output shaft of the speed reducer 10 is coaxially arranged with a central shaft of the gear 14, an output shaft of the speed reducer 10 is arranged perpendicular to an output shaft of the motor 11, and a length direction of the rack 13 is parallel to the output shaft of the motor 11.
The motion simulation mechanism further comprises a clamp fixing plate 9 fixed on the carriage 12, and a clamp 7 is installed at one end, facing the sample 8, of the clamp fixing plate 9. The clamp fixing plate 9 is connected with the clamp 7 through a bolt.
A convex guide rail is arranged above the bottom plate 1, and a sliding groove at the bottom end of the carriage 12 is clamped on the guide rail and is in sliding connection with the guide rail.
Referring to fig. 1 and 2, the force measuring mechanism further comprises a load cell support platform 17 fixed above the base plate 1, the upper part of the load cell support platform 17 is slidably connected with the sensor sliding support plate 6 through a guide rail slider, and the sensor fixing support plate 2 is fixed on the load cell support platform 17. The load cell support platform 17 is fixed to the base plate 1 by bolts.
Two sensor sliding support plate slide rails 5 are arranged on the force measuring sensor support platform 17, a guide rail slide block is respectively fixed at two ends of the lower part of the force measuring sensor support platform 17, and a clamping groove of the guide rail slide block is clamped on the sensor sliding support plate slide rails 5. The sensor sliding support plate slide rail 5 is fixed on the force measuring sensor support platform 17 through bolt connection, and the upper part is connected with the sensor sliding support plate 6 through a guide rail slide block. The sensor sliding support plate 6 is connected with a clamp 7 through a bolt. The clamp 7 located on the sensor slide support plate 6 and the clamp fixing plate 9 has the same structure.
Referring to fig. 1, both ends of a load cell 4 are connected to a sensor fixing support plate 2 and a sensor sliding support plate 6 by bolts (using an elongated bolt 3). The load cell 4 is an S-shaped load cell. The load cell 4 is controlled to be adjusted to an initial unstressed state by adjusting the bolt.
The working principle of the corrugated pipe simulation fatigue test device is as follows.
Firstly, preprocessing data, and obtaining a load spectrum and displacement data of the corrugated pipe in a preset time period through computer simulation according to a temperature change curve of the corrugated pipe in the use environment in the preset time period (such as the whole year or one day). The annual load data of the corrugated pipe is processed, and the load spectrum is converted into control pulses of the motor 11.
The corrugated pipe is made into a local sample of four waves, two ends of the sample are clamped by clamps 7, and the clamps 7 are respectively arranged on a clamp fixing plate 9 and a sensor sliding supporting plate 6. The slide carriage 12 is moved forward and backward to observe whether or not the state of the sample 8 and the load cell 4 is proper. The extension bolt 3 is adjusted to bring the load cell 4 to an initial state.
Electrifying a motor 11, setting control pulses of reciprocating motion of the preprocessed simulation corrugated pipe in a preset time period, starting the motor 11 to drive a gear 14 to rotate through a speed reducer, engaging the gear 14 with a rack 13 to drive the whole carriage 12 to move according to a set frequency, stretching and loosening a sample 8 under the clamping of clamps 7 at two ends, reciprocating motion, and recording data of a force measuring sensor 4 in the running process of the experimental device. After the experiment is finished, the power supply is cut off, the clamp 7 and the sample 8 are disassembled, and all parts of the equipment are checked and the experimental site is cleaned. And calculating and analyzing the data obtained by the experiment.
The corrugated pipe simulation fatigue test device provided by the embodiment provides power and control through the driving mechanism, realizes various periodic reciprocating motions required by experiments through the matching of the components such as the gear 14, the rack 13, the carriage 12 and the like, can truly simulate the test of fatigue damage caused by annual or annual temperature fluctuation of the components such as the corrugated pipe and the like, and is convenient for researching the stress state of the corrugated pipe, the fatigue damage mechanism, the fatigue life prediction and the like. The reciprocating motion of the carriage 12 driving the sample 8 can simulate the change of the material dimension caused by the temperature in any time period. Meanwhile, the load state of the test sample 8 in the experimental process can be obtained through the force cell 4, and the fatigue mechanism of the test sample can be researched and the fatigue life can be predicted. The corrugated pipe simulation fatigue test device is simple in structure and safe to operate, can realize tests on various samples such as corrugated pipes and springs, is low in cost and is easy to popularize.
The invention further provides a test method of the corrugated pipe simulation fatigue test device.
In this preferred embodiment, a testing method of a bellows simulation fatigue testing apparatus includes the following steps:
step S10, installing displacement and load monitoring equipment on the corrugated pipe using site, collecting displacement data and a load map of the corrugated pipe in a preset time period on the site, and processing the load map of the corrugated pipe in the preset time period to convert the load map into control pulses of a driving mechanism (namely a motor);
step S20, after fixing the two ends of the sample with the clamp 7, adjusting the force cell 4 to reach the initial state;
and step S30, electrifying the driving mechanism, setting the output power of the preprocessed control pulse control driving mechanism, driving the planker 12 to move according to the set frequency by the meshing of the gear 14 and the rack 13, stretching and loosening the sample under the clamping of the clamps 7 at the two ends, reciprocating, and recording the data of the force measuring sensor 4 in the operation process.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (10)
1. A corrugated pipe simulation fatigue test device is characterized by comprising a bottom plate, a motion simulation mechanism and a force measuring mechanism, wherein the motion simulation mechanism and the force measuring mechanism are arranged on the bottom plate,
the motion simulation mechanism comprises a rack fixed on the bottom plate, a dragging plate which is arranged above the bottom plate and can slide relative to the bottom plate, a gear which is positioned above the rack and is meshed with the rack, and a driving mechanism fixed on the dragging plate, wherein an output shaft of the driving mechanism is fixedly connected with a central shaft of the gear, and a clamp is arranged on the dragging plate to be fixedly connected with one end of a sample;
the force measuring mechanism comprises a sensor sliding support plate which can slide relative to the bottom plate, a sensor fixing support plate fixed above the bottom plate and a force measuring sensor, wherein a clamp is installed on one side of the sensor sliding support plate to be fixedly connected with the other end of the sample, and two ends of the force measuring sensor are respectively connected with the sensor fixing support plate and the sensor sliding support plate.
2. A bellows simulation fatigue test apparatus according to claim 1, wherein the driving mechanism includes a motor and a reducer fixed to the carriage, an output shaft of the motor is connected to the reducer, and an output shaft of the reducer is fixedly connected to a central shaft of the gear.
3. A bellows simulation fatigue test apparatus according to claim 2, wherein the motion simulation mechanism further comprises a gear support plate fixed to the carriage, and a central shaft of the gear is erected on one side of the gear support plate and is fixedly connected with an output shaft of the speed reducer.
4. A bellows simulation fatigue test apparatus according to claim 2, wherein the speed reducer is an L-shaped speed reducer, an output shaft of the speed reducer is disposed coaxially with a central axis of the gear, the output shaft of the speed reducer is disposed perpendicularly to an output shaft of the motor, and a length direction of the rack is parallel to the output shaft of the motor.
5. A bellows simulation fatigue test apparatus according to claim 1, wherein the motion simulation mechanism further comprises a clamp fixing plate fixed to the carriage, and a clamp is mounted on an end of the clamp fixing plate facing the test specimen.
6. A bellows simulation fatigue test apparatus according to claim 1, wherein a protruding guide rail is installed above the bottom plate, and the bottom end sliding groove of the carriage is clamped on the guide rail and is slidably connected therewith.
7. A bellows simulation fatigue test device according to claim 1, wherein the force measuring mechanism further comprises a load cell support platform fixed above the base plate, an upper portion of the load cell support platform is slidably connected to the sensor sliding support plate through a rail slider, and the sensor fixing support plate is fixed to the load cell support platform.
8. A bellows simulation fatigue test device according to claim 1, wherein the load cell support platform is provided with two sensor sliding support plate slide rails, a guide rail slider is fixed to each of the two ends of the lower portion of the load cell support platform, and the engaging groove of the guide rail slider is engaged with the sensor sliding support plate slide rails.
9. A bellows simulation fatigue test device according to any one of claims 1 to 8, wherein both ends of the load cell are connected to a sensor fixing support plate and a sensor sliding support plate by bolts; the force sensor is an S-shaped force sensor.
10. A test method based on the bellows simulation fatigue test apparatus according to any one of claims 1 to 9, characterized by comprising the steps of:
installing displacement and load monitoring equipment on a corrugated pipe use site, collecting displacement data and a load map of the corrugated pipe in a preset time period on the site, and processing the load map of the corrugated pipe in the preset time period to convert the load map into control pulses of a driving mechanism;
fixing two ends of the sample with a clamp, and adjusting the force measuring sensor to reach an initial state;
and electrifying the driving mechanism, setting a preprocessed control pulse to control the output power of the driving mechanism, driving the planker to move according to a set frequency by meshing the gear and the rack, stretching and loosening the sample under the clamping of the clamps at the two ends, performing reciprocating motion, and recording the data of the force measuring sensor in the operation process.
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| CN112033833A (en) * | 2020-09-02 | 2020-12-04 | 上海海事大学 | Flexible corrugated pipe micro-motion loading fatigue test device |
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| CN113092004A (en) * | 2021-04-01 | 2021-07-09 | 安徽春辉仪表线缆集团有限公司 | Pressure-resistant fatigue test device for pressure gauge |
| CN113252328A (en) * | 2021-05-13 | 2021-08-13 | 重庆理工大学 | Exoskeleton fatigue life testing device |
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| CN112307608A (en) * | 2020-10-23 | 2021-02-02 | 岭澳核电有限公司 | Nonlinear fatigue damage life evaluation treatment method for austenitic stainless steel pipeline |
| CN112307608B (en) * | 2020-10-23 | 2023-08-22 | 岭澳核电有限公司 | Austenitic stainless steel pipeline nonlinear fatigue damage life assessment processing method |
| CN113092004A (en) * | 2021-04-01 | 2021-07-09 | 安徽春辉仪表线缆集团有限公司 | Pressure-resistant fatigue test device for pressure gauge |
| CN113252328A (en) * | 2021-05-13 | 2021-08-13 | 重庆理工大学 | Exoskeleton fatigue life testing device |
| CN113252328B (en) * | 2021-05-13 | 2022-10-18 | 重庆理工大学 | Exoskeleton fatigue life testing device |
| CN114624127A (en) * | 2021-12-21 | 2022-06-14 | 平高集团有限公司 | Metal bellows fatigue life test device for vacuum interrupter |
| CN114688368A (en) * | 2022-04-06 | 2022-07-01 | 云南省滇中引水工程有限公司 | Preparation method of fracture-resistant buried steel pipe of over-active fault |
| CN114688368B (en) * | 2022-04-06 | 2024-04-12 | 云南省滇中引水工程有限公司 | Preparation method of fracture-resistant buried steel pipe with overactive fault |
| CN115031573A (en) * | 2022-06-01 | 2022-09-09 | 南京理工大学 | Firearm action reliability test device |
| CN115031573B (en) * | 2022-06-01 | 2023-07-18 | 南京理工大学 | Firearm action reliability test device |
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