CN114047071A - Parallel fatigue test device based on structure test platform - Google Patents
Parallel fatigue test device based on structure test platform Download PDFInfo
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- CN114047071A CN114047071A CN202111395685.0A CN202111395685A CN114047071A CN 114047071 A CN114047071 A CN 114047071A CN 202111395685 A CN202111395685 A CN 202111395685A CN 114047071 A CN114047071 A CN 114047071A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a parallel fatigue test device based on a structural test platform, which comprises the structural test platform for providing a counterforce foundation, wherein a loading cross beam and a fixed cross beam are arranged on the structural test platform at intervals along the front-back direction; a test piece is arranged between the loading cross beam and the fixed cross beam at intervals, and actuators are symmetrically arranged between the loading cross beam and the fixed cross beam which are positioned at two sides of the test piece; the two groups of actuators act on the loading beam at the same time, and the loading beam generates rolling friction or movement under sliding friction relative to the rolling support under stress; therefore, the large-tonnage horizontal fatigue test system with the double actuators connected in parallel is formed based on the structural test platform, the maximum load of the system can reach 2 times of the load of the actuators, the system is convenient to install and disassemble, the application range of the system is wide, the requirement of large-load loading is met, and the stability of the system is good.
Description
Technical Field
The invention relates to the technical field of structural fatigue tests, in particular to a parallel type fatigue test device based on a structural test platform.
Background
The fatigue testing machine is a testing device used for testing the fatigue performance of metal and non-metal materials, parts, engineering structures and the like under certain conditions and environments. With the rapid development of national economy, a batch of major engineering projects such as Gangzhu-Auao bridge, Sichuan-Tibet railway, Beijing Daxing International airport and the like are successively put on the horse, the requirement on the large-tonnage fatigue performance assessment of the engineering structure is continuously increased, and particularly, a large-tonnage and strong-universality test device is required to meet the requirement on the fatigue performance assessment of engineering equipment.
In the prior art, an electro-hydraulic servo system is adopted in a fatigue testing machine with more than 200 tons, and a fatigue actuator is generally arranged. Because fatigue actuator piston rod is heavier, piston rod lateral wear appears in long-term test in-process easily in horizontal installation, and current fatigue test device is mostly vertical structure, and the test installation is inconvenient, the detection object that is suitable for is simple, the equipment maintenance dismouting difficulty just is difficult to realize the heavy load loading requirement.
Disclosure of Invention
The applicant aims at the defects in the prior art, provides a parallel fatigue test device based on a structure test platform and reasonable in structure, utilizes the structure test platform as a counter-force foundation device, adopts a modularized mode to build, thereby forming a large-tonnage horizontal fatigue test device with double actuators connected in parallel, greatly improving the mounting and dismounting efficiency, having good universality and expansibility, effectively ensuring the loading requirement of a large-load test, and having good system stability.
The technical scheme adopted by the invention is as follows:
a parallel type fatigue test device based on a structure test platform comprises the structure test platform, wherein the structure test platform provides a counter-force foundation, a loading cross beam and a fixed cross beam are arranged on the structure test platform at intervals along the front-back direction, a rolling support is arranged between the bottom surface of the loading cross beam and the surface of the structure test platform, the loading cross beam is supported on the rolling support, and the fixed cross beam and the structure test platform are relatively and fixedly installed; a test piece is arranged between the loading cross beam and the fixed cross beam at intervals, and actuators are symmetrically arranged between the loading cross beam and the fixed cross beam which are positioned at two sides of the test piece; the two groups of actuators act on the loading beam simultaneously, and the loading beam is stressed to generate rolling friction or movement under sliding friction relative to the rolling support.
As a further improvement of the above technical solution:
the end faces of the piston rods at the output end parts of the two groups of actuators are connected with the loading beam through cylindrical connectors; the cylindrical surface connector comprises a convex surface connecting part and a concave surface connecting part which are mutually matched through a concave surface and a convex surface.
The end parts opposite to the convex surface connecting part and the concave surface connecting part are respectively arranged to be matched with a convex surface structure and a concave surface structure, and the end parts back to the back of the concave surface connecting part and the convex surface connecting part are respectively fixedly connected with the side surface of the loading beam and the end surface of the piston rod of the actuator.
The convex surface connecting part and the concave surface connecting part are respectively provided with a flange which extends outwards along the circumferential direction, a safety retraction pull rod which is uniformly arranged in the circumferential direction is arranged between the two flanges, the convex surface and the concave surface which are opposite to each other of the convex surface connecting part and the concave surface connecting part are contacted, and the structure centering change caused by the elastic deformation of the loading beam is eliminated through the relative rotation of the concave-convex connecting part.
The strength of the safe retraction pull rod is smaller than the strength of mounting bolts between the two ends of the cylindrical surface connector and the loading cross beam and between the two ends of the cylindrical surface connector and the actuator.
When the loading cross beam and the rolling support are in small displacement, rolling friction exists between the loading cross beam and the rolling support; when the loading beam and the rolling support are in large displacement, sliding friction exists between the loading beam and the rolling support.
The rolling support structure is as follows: the device comprises a base arranged on a structural test platform, wherein a support is arranged on the base, a plurality of rolling grooves are formed in the support along the moving direction of a loading cross beam, rolling bodies are rotatably arranged in the single rolling groove, and the rolling bodies move in the rolling grooves along the moving direction of the loading cross beam; and a sliding plate is fixedly arranged on the bottom surface of the loading cross beam, and the bottom surface of the sliding plate is in contact with the rolling body.
Adjusting wedge blocks are movably mounted on the bases positioned on the periphery of the support, the support is supported on the adjusting wedge blocks, and the support and the adjusting wedge blocks are matched in an inclined plane; the adjusting wedge block moves relative to the base through the rotation of the screw rod, and the height of the adjusting wedge block relative to the base is adjusted through the matched inclined plane.
Run through the loading crossbeam middle part around and seted up square fillet hole, run through fixed cross beam around and seted up the same square fillet hole, two square fillet holes arrange with one heart and common fixed mounting test piece.
The two groups of actuators are respectively provided with a displacement sensor, a force sensor and a servo valve which are electrically connected with the servo controller, and the servo controller collects data of the displacement sensors and the force sensors in real time and controls the action of the servo valve in real time; one group of actuators is used as a main actuator, the other group of actuators is used as a slave actuator, and the slave actuator follows the main actuator at any time; the control force value of the servo controller is the total force value of the two actuators, and the control displacement is the displacement of the main actuator.
The invention has the following beneficial effects:
the large-tonnage horizontal fatigue testing system with the parallel double actuators is compact and reasonable in structure and convenient to operate, the large-tonnage horizontal fatigue testing system with the parallel double actuators is formed based on a structural testing platform, the maximum load of the large-tonnage horizontal fatigue testing system can reach 2 times of the load of the actuators, the functions are various, the testing load is large, the application range is wide, the precision of the system is ensured, the stability of the system is improved, the universality is good, a feasible solution is provided for the large-load fatigue testing requirement of more than 1000 tons, and the breakthrough of the domestic large-tonnage fatigue testing machine technology is greatly assisted;
the equipment has wide application range: the test function is expanded by replacing different test tools, and the test development of various test pieces such as cable structures, civil engineering structures, ship structures and the like can be realized; because the device uses the structural test platform as a counter-force foundation and adopts a modular design, the test function can be expanded by a method of additionally arranging special modules according to a test object;
the test piece is convenient to mount: the horizontal equipment is convenient for the test piece to be installed by using a crane, thereby greatly reducing the test piece installation difficulty and improving the efficiency;
the control precision is high: the complete closed-loop control is adopted, the control precision is high, the system is stable and well-shaped, and accurate and reliable test results can be obtained;
the safety is high: the connecting pieces such as the bolts do not bear fatigue load during testing, the fracture risk is avoided, and the safety is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a top view of the present invention (omitting the structural test platform).
Fig. 3 is a schematic diagram of the construction of the cylinder connector of the present invention.
Fig. 4 is a schematic structural view of the rolling support of the present invention.
Wherein: 100. loading a beam; 200. rolling and supporting; 300. a structural test platform; 400. a cylindrical surface connector; 500. an actuator; 600. fixing the cross beam; 700. a reaction frame;
201. a base; 202. adjusting the wedge block; 203. a support; 204. a rolling body; 205. a slide plate;
401. a concave connecting portion; 402. a convex connecting part; 403. the pull rod is retracted safely.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and fig. 2, the parallel fatigue testing apparatus based on the structural test platform of the present embodiment includes the structural test platform 300, the structural test platform 300 provides a counter force foundation, the structural test platform 300 is provided with loading beams 100 and fixed beams 600 at intervals along the front-back direction, a rolling support 200 is installed between the bottom surface of the loading beam 100 and the surface of the structural test platform 300, the loading beam 100 is supported on the rolling support 200, and the fixed beam 600 and the structural test platform 300 are relatively fixedly installed; a test piece is arranged between the loading beam 100 and the fixed beam 600 at intervals, and the actuators 500 are symmetrically arranged between the loading beam 100 and the fixed beam 600 on the two sides of the test piece; the two sets of actuators 500 simultaneously act on the load beam 100, and the load beam 100 is forced to move under rolling friction or sliding friction relative to the rolling support 200.
In this embodiment, the rolling support 200 supports the load beam 100 while also enabling the load beam 100 to move freely in the loading direction.
The end faces of the piston rods at the output ends of the two groups of actuators 500 are connected with the loading beam 100 through the cylindrical connectors 400; the cylinder connector 400 includes a male connecting portion 402 and a female connecting portion 401 that mate with each other via male and female surfaces, as shown in fig. 3.
The opposite ends of the convex connecting part 402 and the concave connecting part 401 are respectively set to be matched with a convex structure and a concave structure, and the opposite ends of the concave connecting part 401 and the convex connecting part 402 are respectively fixedly connected with the side surface of the loading beam 100 and the end surface of the piston rod of the actuator 500.
In the test, a slight sliding can be generated between the convex structure of the convex connecting part 402 and the concave structure of the concave connecting part 401, so as to compensate the bending deformation generated in the test of the loading beam 100, and the load of the actuator 500 can be uniformly transmitted to the test piece.
The junction of the concave connecting part 401 and the loading beam 100 is a cone flange-shaped structure, which is used for assisting the effective diffusion of the load, and the cone flange-shaped structure is mounted on the side surface of the loading beam 100 through bolts.
The convex connecting part 402 and the concave connecting part 401 respectively extend outwards along the circumferential direction to form flanges, safety retraction pull rods 403 which are uniformly arranged in the circumferential direction are jointly arranged between the two flanges, the opposite convex surface and concave surface of the convex connecting part 402 and the concave connecting part 401 are in contact, and structural centering change caused by elastic deformation of a loading beam is eliminated through relative rotation of the concave-convex connecting parts; the convex structure and the concave structure are connected in contact through the installation of the safety retraction pull rod 403, so that when the actuator 500 is retracted, the loading beam 100 can be pulled back, and the purpose of the concave-convex arrangement is to absorb the bending deformation of the loading beam during the test.
The strength of the safety retraction pull rod 403 is smaller than the strength of the bolts arranged between the two ends of the cylindrical surface connector 400 and the loading beam 100 and between the two ends of the cylindrical surface connector 400 and the actuator 500, so that when an emergency test piece is broken, the safety retraction pull rod 403 can be broken before the bolts, the actuator 500 and the loading beam 100 are effectively prevented from being damaged or the connection parts of the actuator 500 and the loading beam 100 are effectively prevented from being damaged, and the whole service life of the equipment is prolonged.
When the loading beam 100 and the rolling support 200 are in small displacement, rolling friction exists between the loading beam and the rolling support; when the load beam 100 and the rolling support 200 are displaced greatly, they are in sliding friction with each other.
As shown in fig. 4, the rolling support 200 has a structure of: the structure testing device comprises a base 201 arranged on a structure testing platform 300, wherein a support 203 is arranged on the base 201, a plurality of rolling grooves are formed in the support 203 along the moving direction of a loading cross beam 100, rolling bodies 204 are rotatably arranged in the single rolling groove, and the rolling bodies 204 move in the rolling grooves along the moving direction of the loading cross beam 100; a sliding plate 205 is fixedly arranged on the bottom surface of the loading beam 100, and the bottom surface of the sliding plate 205 is in contact with the rolling body 204; in this embodiment, the bottom surface of the sliding plate 205 is provided with a notch, two sides of the notch are fitted with two ends of the rolling element 204, the upper part of the rolling element 204 is inserted into the notch, and the sliding plate 205 plays a role of guiding when moving relative to the rolling element 204 through the notch.
When the loading beam 100 moves with a small displacement, the rolling bodies 204 in the rolling supports 200 roll in the corresponding rolling grooves, so that rolling friction is formed between the loading beam 100 and the rolling supports 200; when the loading beam 100 moves in a large displacement manner, the rolling bodies 204 in the rolling support 200 roll until the ends of the corresponding rolling grooves are limited and cannot roll any more, so that sliding friction is formed between the loading beam 100 and the rolling support 200.
Adjusting wedges 202 are movably mounted on the bases 201 on the periphery of the support 203, the support 203 is supported on the adjusting wedges 202, and the support 203 and the adjusting wedges 202 are matched in an inclined plane; the adjusting wedge 202 moves relative to the base 201 through the rotation of the screw rod, and the height of the adjusting wedge 202 relative to the base 201 is adjusted through the matched inclined surface of the adjusting wedge 203, so that the height of the rolling support 200 and the height of the loading beam 100 are finely adjusted.
The height of the loading beam 100 is adjusted by adjusting the wedge 202, so that on one hand, the mounting level of the loading beam 100 is consistent with that of a test piece on the fixed beam 600; on the other hand, the wear of the rolling body 204 in the use process can be compensated by adjusting the wedge block 202; when the abrasion amount of the rolling body 204 reaches a certain value, the adjustment wedge 202 can be replaced to increase the wedging amount, so that the reduction of the height of the loading beam 100 caused by the abrasion of the rolling body 204 is compensated, and the replacement period of the rolling body 204 is prolonged.
In this embodiment, the arrangement of the rolling support 200 is suitable for the characteristics of heavy weight of the loading beam 100, small cyclic displacement and many cyclic times in a fatigue test, and the bearing cannot meet the requirements.
A square round corner hole is formed in the middle of the front and rear penetrating loading beam 100, the same square round corner hole is formed in the front and rear penetrating fixing beam 600, and the two square round corner holes are concentrically arranged and are used for fixing and mounting a test piece together; the method specifically comprises the following steps: the test piece is connected with the tool through threads or a pin shaft, the tool is provided with a bearing surface, the size of the bearing surface is larger than that of the square round angle hole, and the bearing surface of the tool is directly pressed on the peripheral area of the square round angle hole of the cross beam.
When the device is used, a test piece or a tool can penetrate through the centers of the two square round-angle holes, two ends of the test piece or the tool are respectively fixed on the fixed cross beam 600 and the loading cross beam 100, and during testing, the actuator 500 applies force to the loading cross beam 100, so that load is transferred to the test piece through the loading cross beam 100;
set up to square round corner hole, be in order to pass bigger test piece and avoid the stress concentration influence that the quad slit right angle brought.
In this embodiment, a reaction frame 700 is further installed on the rear side of the fixed beam 600, and the movement of the fixed beam 600 is further limited by the reaction frame 700.
In this embodiment, the self-stressed frame structure is formed by the loading beam 100, the two sets of actuators 500, the cylindrical surface connector 400, and the fixed beam 600, so that the design of a longitudinal bearing beam is avoided, the actuators 500 are used as the longitudinal bearing beam, uncertain factors are effectively reduced, the test space is enlarged, and the system rigidity and response speed are improved, thereby improving the test efficiency and being suitable for more test pieces.
During test loading, the two groups of actuators 500 are loaded simultaneously, the frame structure and the test piece form a self-balancing stress system, and the reaction frame 700 only bears impact load when the test piece is broken.
In this embodiment, the actuator 500 is a double-rod electro-hydraulic servo actuator with hydrostatic bearing.
The two groups of actuators 500 are respectively provided with a displacement sensor, a force sensor and a servo valve which are electrically connected with the servo controller, and the servo controller collects data of the displacement sensor and the force sensor in real time and controls the action of the servo valve in real time; one set of actuators 500 is used as a master actuator, the other set of actuators 500 is used as a slave actuator, and the slave actuator follows the master actuator at any time; the control force value of the servo controller is the total force value of the two actuators 500, and the control displacement is the displacement of the main actuator.
In this embodiment, the force sensor is a differential pressure type force sensor and is embedded in the actuator 500, so that excessive force transmission connecting pieces caused by the external force sensor are avoided, and uncertain factors are reduced.
During testing, the force values measured by the force sensors on the two groups of actuators 500 are respectively F1 (master actuator) and F2 (slave actuator), and the displacement values measured by the displacement sensors are respectively S1 (master actuator) and S2 (slave actuator); the sensor data had the following characteristics: f1 and F2 are not necessarily equal, S1 is equal to S2+ δ (where δ is a minimum value close to 0), the output force value F of the entire tester is equal to F1+ F2, and the output displacement S is equal to (S1+ S2)/2. In actual use, the control force value of the testing machine is the total output force value F, and the control displacement is the displacement value of the main actuator; the method specifically comprises the following steps:
1) load control mode
Setting the force and displacement of the driving actuator as F1 and S1, respectively, the force and displacement of the driven actuator as F2 and S2, respectively, and setting the loading target value as F0; at t, the servo controller takes F as a feedback signal of the tester force closed-loop control (wherein F is F1+ F2), and the actuator force value F is controlled to approach F0 continuously; in the process, the control system takes S1 as a follow control signal of the slave actuator, the servo control system controls the displacement S2 of the slave actuator to be equal to S1 at t + t0, t0 is a value close to 0, and S1-S2 are equal to delta S at t, and t0 can reach 1ms at minimum and delta S can reach 0.001mm at minimum with the support of modern computer technology, so that the follow control system has extremely high follow precision and response speed. In this control mode, the testing machine outputs (displays) a force value of F and a displacement value of (S1+ S2)/2.
2) Displacement control mode
Setting the force and displacement of the driving actuator as F1 and S1, respectively, the force and displacement of the driven actuator as F2 and S2, respectively, and setting the loading target value as S0; at t, the servo controller takes S as a feedback signal of the closed-loop control of the displacement of the testing machine (wherein S is (S1+ S2)/2), and the displacement S of the actuator is controlled to approach S0 continuously; in the process, the control system takes S1 as a follow control signal of the slave actuator, the servo control system controls the displacement S2 of the slave actuator to be equal to values of S1 and t0 which are close to 0 at t + t0, and S1-S2 are equal to delta S at t, the t0 can reach 1ms at minimum and the delta S can reach 0.001mm at minimum under the support of modern computer technology, and the follow control system has extremely high follow precision and response speed. In this control mode, the testing machine outputs (displays) a force value of F1+ F2 and a displacement value of S.
According to the invention, the large-tonnage horizontal fatigue testing system with the double actuators connected in parallel is formed based on the structural testing platform, the maximum load of the system can reach 2 times of the load of the actuators, the system has various functions, large testing load and wide application range, the accuracy of the system is ensured, the stability of the system is improved, the universality is good, a feasible solution is provided for the requirement of the large-load fatigue testing of more than 1000 tons, and the breakthrough of the technology of the domestic large-tonnage fatigue testing machine is facilitated.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (10)
1. The utility model provides a parallel fatigue test device based on structure test platform, includes structure test platform (300), its characterized in that: the structure test platform (300) provides a counter force foundation, the structure test platform (300) is provided with a loading cross beam (100) and a fixed cross beam (600) at intervals along the front-back direction, a rolling support (200) is arranged between the bottom surface of the loading cross beam (100) and the surface of the structure test platform (300), the loading cross beam (100) is supported on the rolling support (200), and the fixed cross beam (600) and the structure test platform (300) are relatively and fixedly installed; a test piece is arranged between the loading cross beam (100) and the fixed cross beam (600) at intervals, and the actuators (500) are symmetrically arranged between the loading cross beam (100) and the fixed cross beam (600) on the two sides of the test piece; the two groups of actuators (500) act on the loading beam (100) simultaneously, and the loading beam (100) is stressed to generate rolling friction or movement under sliding friction relative to the rolling support (200).
2. A parallel fatigue testing device based on a structural testing platform according to claim 1, wherein: the end faces of piston rods at the output ends of the two groups of actuators (500) are connected with the loading beam (100) through cylindrical connectors (400); the cylindrical connector (400) comprises a convex connecting part (402) and a concave connecting part (401) which are matched with each other through a concave surface and a convex surface.
3. A parallel fatigue testing device based on a structural test platform according to claim 2, wherein: the end parts opposite to the convex connecting part (402) and the concave connecting part (401) are respectively arranged to be matched with a convex structure and a concave structure, and the end parts opposite to each other of the concave connecting part (401) and the convex connecting part (402) are respectively fixedly connected with the side surface of the loading beam (100) and the end surface of the piston rod of the actuator (500).
4. A parallel fatigue testing device based on a structural test platform according to claim 2, wherein: the convex surface connecting part (402) and the concave surface connecting part (401) are respectively provided with a flange which extends outwards along the circumferential direction, a safety retraction pull rod (403) which is uniformly arranged in the circumferential direction is arranged between the two flanges, the opposite convex surface and concave surface of the convex surface connecting part (402) and the concave surface connecting part (401) are in contact, and the structure centering change caused by the elastic deformation of the loading beam is eliminated through the relative rotation of the concave-convex connecting part.
5. A parallel fatigue testing device based on a structural testing platform according to claim 4, wherein: the strength of the safety retraction pull rod (403) is smaller than that of mounting bolts between two ends of the cylindrical surface connector (400) and the loading cross beam (100) and between two ends of the cylindrical surface connector and the actuator (500).
6. A parallel fatigue testing device based on a structural testing platform according to claim 1, wherein: when the loading cross beam (100) and the rolling support (200) are in small displacement, rolling friction exists between the loading cross beam and the rolling support; when the loading beam (100) and the rolling support (200) are in large displacement, sliding friction exists between the loading beam and the rolling support.
7. A parallel fatigue testing device based on a structural testing platform according to claim 6, wherein: the rolling support (200) has the structure that: the structure testing device comprises a base (201) arranged on a structure testing platform (300), wherein a support (203) is arranged on the base (201), a plurality of rolling grooves are formed in the support (203) along the moving direction of a loading cross beam (100), rolling bodies (204) are rotatably arranged in the single rolling groove, and the rolling bodies (204) move in the rolling grooves along the moving direction of the loading cross beam (100); and a sliding plate (205) is fixedly mounted on the bottom surface of the loading cross beam (100), and the bottom surface of the sliding plate (205) is in contact with the rolling body (204).
8. A parallel fatigue testing device based on a structural testing platform according to claim 7, wherein: adjusting wedges (202) are movably mounted on the bases (201) positioned on the periphery of the support (203), the support (203) is supported on the adjusting wedges (202), and the support (203) is matched with the adjusting wedges (202) in an inclined plane manner; the adjusting wedge block (202) moves relative to the base (201) through the rotation of the screw rod, and the height of the adjusting wedge block (202) relative to the base (201) is adjusted through the matched inclined surface.
9. A parallel fatigue testing device based on a structural testing platform according to claim 1, wherein: the middle of the front and rear penetrating loading beam (100) is provided with a square fillet hole, the front and rear penetrating fixing beam (600) is provided with the same square fillet hole, and the two square fillet holes are concentrically arranged.
10. A parallel fatigue testing device based on a structural testing platform according to claim 1, wherein: the two groups of actuators (500) are respectively provided with a displacement sensor, a force sensor and a servo valve which are electrically connected with the servo controller, and the servo controller collects data of the displacement sensors and the force sensors in real time and controls the action of the servo valve in real time; one group of actuators (500) is used as a main actuator, the other group of actuators (500) is used as a slave actuator, and the slave actuator follows the main actuator at any time; the control force value of the servo controller is the total force value of the two actuators (500), and the control displacement is the displacement of the main actuator.
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