CN114047071B - Parallel fatigue test device based on structural test platform - Google Patents
Parallel fatigue test device based on structural test platform Download PDFInfo
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- CN114047071B CN114047071B CN202111395685.0A CN202111395685A CN114047071B CN 114047071 B CN114047071 B CN 114047071B CN 202111395685 A CN202111395685 A CN 202111395685A CN 114047071 B CN114047071 B CN 114047071B
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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 providing a reaction 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 rolling support is arranged between the bottom surface of the loading cross beam and the surface of the structural test platform, the loading cross beam is supported on the rolling support, and the fixed cross beam and the structural test platform are relatively and fixedly arranged; a test piece is commonly installed between the loading cross beam and the fixed cross beam at intervals, and actuators are commonly and symmetrically installed between the loading cross beams and the fixed cross beams which are positioned at two sides of the test piece; the two groups of actuators act on the loading cross beam simultaneously, and the loading cross beam is stressed to generate rolling friction or movement under sliding friction relative to the rolling support; therefore, the double-actuator parallel large-tonnage horizontal fatigue test system 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 mount and dismount, the application range is wide, the requirement of loading of the large load is met, and the system stability is good.
Description
Technical Field
The invention relates to the technical field of structural fatigue testing, in particular to a parallel fatigue testing device based on a structural testing platform.
Background
The fatigue testing machine is testing equipment for testing fatigue properties 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 lot of heavy engineering projects are successively on horses, such as a port-to-ball bridge, a Sichuan railway, a Beijing great international airport and the like, and the requirements for examining the fatigue performance of engineering structures in large tonnage are continuously increased, and particularly, large tonnage and high universality test equipment is required to meet the requirements for examining the fatigue performance of engineering equipment.
In the prior art, more than 200 tons of fatigue testing machines adopt an electrohydraulic servo system, and a fatigue actuator is generally arranged. Because the fatigue actuator piston rod is heavier, the piston rod side direction wearing and tearing appear easily in long-term test in horizontal installation, and current fatigue test device is mostly vertical structure, and test installation is inconvenient, suitable test object is simple, equipment maintenance dismouting difficulty and be difficult to realize the heavy load loading requirement.
Disclosure of Invention
The applicant provides a reasonable parallel fatigue test device based on a structural test platform aiming at the defects in the prior art, the structural test platform is used as a counter force base device, and the structural test platform is assembled in a modularized mode, so that a double-actuator parallel large-tonnage horizontal fatigue test device is formed, the mounting and dismounting efficiency is greatly improved, the universality and the expansibility are good, the loading requirement of a large-load test can be effectively ensured, and the system stability is good.
The technical scheme adopted by the invention is as follows:
the parallel fatigue test device based on the structure test platform comprises the structure test platform, wherein the structure test platform provides a counterforce 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 arranged; a test piece is commonly installed between the loading cross beam and the fixed cross beam at intervals, and actuators are commonly and symmetrically installed between the loading cross beams and the fixed cross beams which are positioned at two sides of the test piece; the two sets of actuators act on the loading cross beam simultaneously, and the loading cross 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 scheme:
the end faces of piston rods at the output ends of the two groups of actuators are connected with the loading cross 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 concave and convex surfaces.
The opposite ends of the convex connecting part and the concave connecting part are respectively provided with a convex structure and a concave structure which are matched, and the opposite ends of the concave connecting part and the convex connecting part are respectively fixedly connected with the side face of the loading cross beam and the end face of the piston rod of the actuator.
The convex connecting part and the concave connecting part are respectively provided with flanges extending outwards along the circumferential direction, a safe retraction pull rod which is uniformly arranged in the circumferential direction is arranged between the two flanges, the convex surface and the concave surface opposite to the convex connecting part are contacted, and the structural 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 that of the mounting bolts between the two ends of the cylindrical surface connector and the loading cross beam and between the cylindrical surface connector and the actuator.
When the load beam and the rolling support are in small displacement, rolling friction is generated between the load beam and the rolling support; when the loading cross beam and the rolling support are in large displacement, sliding friction is formed between the loading cross 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 grooves, and the rolling bodies move in the rolling grooves along the moving direction of the loading cross beam; and the bottom surface of the loading cross beam is fixedly provided with a sliding plate, and the bottom surface of the sliding plate is contacted with the rolling bodies.
The bases positioned around the support are movably provided with adjusting wedges, the support is supported on the adjusting wedges, and the support and the adjusting wedges are in inclined plane fit; the screw rod rotates to enable the adjusting wedge block to move relative to the base, and the adjusting wedge block adjusts the height of the support seat relative to the base through the matched inclined plane.
Square round angle holes are formed in the middle of the front and rear penetrating loading cross beams, the same square round angle holes are formed in the front and rear penetrating fixing cross beams, and the two square round angle holes are concentrically arranged and fixedly installed with a 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 a servo controller, and the servo controller acquires data of the displacement sensor and the force sensor 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 is used for following 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 beneficial effects of the invention are as follows:
the invention has compact and reasonable structure and convenient operation, forms a double-actuator parallel large-tonnage horizontal fatigue test system based on the structure test platform, has the maximum load of 2 times of the load of the actuators, has various functions, large test load and wide application range, ensures the precision of the system, improves the stability of the system, has good universality, provides a feasible solution for the requirement of the large-load fatigue test of more than 1000 tons, and greatly contributes to the breakthrough of the technology of domestic large-tonnage fatigue test machines;
the application range of the equipment is wide: the test function is expanded through the replacement of different test tools, so that 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 counterforce foundation, and adopts a modularized design, the test function can be expanded by a method of adding a special module according to a test object;
test piece simple to operate: the horizontal equipment is convenient for the test piece to be installed by using the crane, so that the test piece installation difficulty is greatly reduced, and the efficiency is improved;
the control precision is high: the full closed-loop control is adopted, the control precision is high, the stability and the shape of the system are good, and accurate and reliable test results can be obtained;
the safety is high: the connecting pieces such as bolts and the like do not bear fatigue load in the test, the fracture risk is avoided, and the safety is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a plan view of the present invention (the structural test platform is omitted).
Fig. 3 is a schematic structural view of the cylindrical connector of the present invention.
Fig. 4 is a schematic view of the structure of the rolling support of the present invention.
Wherein: 100. loading a cross beam; 200. a rolling support; 300. a structural test platform; 400. a cylindrical 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 element; 205. a slide plate;
401. a concave surface connection portion; 402. a convex connection portion; 403. the pull rod is retracted safely.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and 2, the parallel fatigue testing device based on a structural testing platform of the embodiment includes a structural testing platform 300, the structural testing platform 300 provides a reaction foundation, a loading cross beam 100 and a fixed cross beam 600 are arranged on the structural testing platform 300 at intervals along the front-back direction, a rolling support 200 is installed between the bottom surface of the loading cross beam 100 and the surface of the structural testing platform 300, the loading cross beam 100 is supported on the rolling support 200, and the fixed cross beam 600 and the structural testing platform 300 are relatively and fixedly installed; a test piece is commonly installed between the loading cross beam 100 and the fixed cross beam 600 at intervals, and actuators 500 are commonly and symmetrically installed between the loading cross beam 100 and the fixed cross beam 600 which are positioned at two sides of the test piece; the two sets of actuators 500 act on the load beam 100 simultaneously, and the load beam 100 is forced to move under rolling friction or sliding friction relative to the rolling support 200.
In the present embodiment, the rolling support 200 supports the loading beam 100 while also enabling the loading beam 100 to move freely in the loading direction.
The end faces of piston rods at the output ends of the two groups of actuators 500 are connected with the loading cross beam 100 through the cylindrical surface connectors 400; the cylindrical connector 400 includes a male connection portion 402 and a female connection portion 401 that are mated with each other by a male and female surface, as shown in fig. 3.
The opposite ends of the convex connection part 402 and the concave connection part 401 are respectively provided with a matched convex structure and a matched concave structure, and the opposite ends of the concave connection part 401 and the convex connection part 402 are respectively fixedly connected with the side surface of the loading cross beam 100 and the end surface of the piston rod of the actuator 500.
During the test, a slight sliding motion is generated between the convex structure of the convex connecting portion 402 and the concave structure of the concave connecting portion 401, so as to compensate the bending deformation generated during the test of the loading beam 100, and the load of the actuator 500 can be uniformly transferred to the test piece.
The concave connection 401 is provided in a cone flange-like structure at the junction with the loading beam 100, which is mounted to the side of the loading beam 100 by bolts, to aid in efficient diffusion of load.
The convex connecting part 402 and the concave connecting part 401 are respectively provided with flanges extending outwards along the circumferential direction, a safety retraction pull rod 403 which is uniformly arranged along the circumferential direction is commonly arranged between the two flanges, the convex surface and the concave surface opposite to the convex connecting part 402 and the concave connecting part 401 are contacted, and the structural centering change caused by the elastic deformation of the loading beam is eliminated through the relative rotation of the concave-convex connecting part; the convex structure and the concave structure are connected in contact by the installation of the safety retraction pull rod 403, so that the loading beam 100 can be pulled back when the actuator 500 is retracted, and the purpose of the concave-convex arrangement is to bend and deform the loading beam during an 'absorption' test.
The strength of the safety retraction pull rod 403 is smaller than the strength of the mounting bolts between the two ends of the cylindrical connector 400 and the loading cross beam 100 and the actuator 500, so that when a sudden test piece breaks, the safety retraction pull rod 403 can break before the bolts, thereby effectively avoiding the damage of the actuator 500 and the loading cross beam 100 or the damage of the connecting part thereof, and helping to prolong the whole service life of the equipment.
When the load beam 100 and the rolling support 200 are in small displacement, rolling friction is generated between the load beam and the rolling support; when the loading cross beam 100 and the rolling support 200 are in large displacement, sliding friction is generated between the loading cross beam and the rolling support.
As shown in fig. 4, the rolling support 200 has the structure that: the test platform comprises a base 201 arranged on a structure test 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 grooves, 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 cross beam 100, and the bottom surface of the sliding plate 205 is contacted with the rolling bodies 204; in this embodiment, the bottom surface of the sliding plate 205 is provided with a notch, two sides of the notch are assembled with two ends of the rolling element 204, the upper part of the rolling element 204 is embedded into the notch, and the guiding function is achieved when the sliding plate 205 moves relative to the rolling element 204 through the arrangement of the notch.
When the loading cross beam 100 moves in a small displacement manner, the rolling bodies 204 in the rolling support 200 roll in the corresponding rolling grooves, so that rolling friction is formed between the loading cross beam 100 and the rolling support 200; when the loading cross beam 100 moves in a large displacement manner, the rolling bodies 204 in the rolling support 200 are limited to the ends of the corresponding rolling grooves and cannot continue rolling any more, so that sliding friction is formed between the loading cross beam 100 and the rolling support 200.
The adjusting wedge blocks 202 are movably arranged on the bases 201 around the supporting seats 203, the supporting seats 203 are supported on the adjusting wedge blocks 202, and the supporting seats 203 are matched with the adjusting wedge blocks 202 in an inclined plane manner; the adjusting wedge 202 moves relative to the base 201 through screw rod rotation, and the adjusting wedge 202 adjusts the height of the support 203 relative to the base 201 through the matched inclined plane, so that fine adjustment of the heights of the rolling support 200 and the loading cross beam 100 is realized.
The height of the loading cross beam 100 is adjusted through the adjusting wedge block 202, so that the mounting level of the loading cross beam 100 is consistent with that of a test piece on the fixed cross beam 600 on one hand; on the other hand, the wear of the rolling bodies 204 during use can be compensated by adjusting the wedge blocks 202; when the wear amount of the rolling elements 204 reaches a certain value, the adjusting wedge 202 can be replaced to increase the wedging amount, so that the reduction of the height of the loading cross beam 100 caused by the wear of the rolling elements 204 can be compensated, and the replacement period of the rolling elements 204 can be prolonged.
In this embodiment, the arrangement of the rolling support 200 is adapted to the characteristics of heavy weight of the loading beam 100, small cyclic displacement and a large number of cycles in fatigue test, and the bearing cannot meet these requirements.
Square round angle holes are formed in the middle of the front and rear penetrating loading cross beam 100, the same square round angle holes are formed in the front and rear penetrating fixing cross beam 600, and the two square round angle holes are concentrically arranged and fixedly installed with a test piece together; the method 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 corner hole, and the bearing surface of the tool is directly pressed on the peripheral area of the square round corner hole of the cross beam.
When the test piece or the tool is used, a test piece or the tool can pass 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 beam 600 and the loading beam 100, and when in test, the actuator 500 applies force to the loading beam 100, and the loading beam 100 transmits load to the test piece;
the square round angle hole is arranged to be capable of penetrating through a larger test piece and avoiding the stress concentration influence caused by the right angle of the square hole.
In this embodiment, a reaction frame 700 is further mounted on the rear side of the fixed cross member 600, and the movement of the fixed cross member 600 is further restricted by the reaction frame 700.
In this embodiment, the loading beam 100, the two sets of actuators 500, the cylindrical connector 400 and the fixed beam 600 together form a self-stressed frame structure, so that the design of a longitudinal bearing beam is avoided, and the actuators 500 are used as the longitudinal bearing beam to effectively reduce uncertain factors, enlarge test space, improve system rigidity and response speed, thereby improving test efficiency and being applicable to more test pieces.
During test loading, the two sets 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 breaks.
In this embodiment, the actuator 500 is a dual-output-rod electro-hydraulic servo actuator with hydrostatic bearings.
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 a servo controller, and the servo controller acquires 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 acts as a master actuator, the other set of actuators 500 acts as slave actuators, the slave actuators following the master actuator at all times; 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 built in the actuator 500, so that excessive force transmission connecting pieces brought by an external force sensor are avoided, and uncertain factors are reduced.
In the test, force values measured by force sensors on the two sets of actuators 500 are respectively F1 (main actuator) and F2 (slave actuator), and displacement values measured by displacement sensors are respectively S1 (main actuator) and S2 (slave actuator); the sensor data has the following characteristics: f1 and F2 are not necessarily equal, s1=s2+δ (where δ is a minimum value approaching 0), and the output force value f=f1+f2 of the whole testing machine, the output displacement s= (s1+s2)/2. When in actual use, the control force value of the testing machine is a total output force value F, and the control displacement is a displacement value of the main actuator; the method 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 the loading target value as F0; at t, the servo controller takes F as a feedback signal of closed loop control of the tester force (wherein F=F1+F2), and controls the actuator force value F to continuously approach F0; in the process, the control system takes S1 as a following 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 close to a value of 0, S1-S2=delta S at t, and under the support of modern computer technology, the minimum of t0 can reach 1ms and the minimum of delta S can reach 0.001mm, and the servo control system has extremely high following precision and response speed. In this control mode, the tester outputs (displays) a force value of F and a displacement value of (S1+S2)/2.
2) Displacement control mode
The force and the displacement of the driving actuator are respectively F1 and S1, the force and the displacement of the driven actuator are respectively F2 and S2, and the loading target value is S0; at t, the servo controller takes S as a feedback signal (S= (S1+S2)/2) of closed-loop control of the displacement of the testing machine, and the displacement S of the actuator is controlled to continuously approach S0; in the process, the control system takes S1 as a following control signal of the slave actuator, the servo control system controls the displacement S2 of the slave actuator to be equal to S1 and t0 to be a value close to 0 at t+t0, S1-S2=delta S at t, the minimum t0 can reach 1ms and the minimum delta S can reach 0.001mm under the support of modern computer technology, and the servo control system has extremely high following precision and response speed. In this control mode, the tester outputs (displays) a force value f1+f2 and a displacement value S.
According to the invention, a double-actuator parallel large-tonnage horizontal fatigue test system is formed based on the structural test platform, the maximum load of the double-actuator parallel large-tonnage horizontal fatigue test system can reach 2 times of the load of the actuators, the functions are various, the test 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 test requirement of more than 1000 tons, and the breakthrough of the technology of the domestic large-tonnage fatigue tester is facilitated.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (6)
1. Parallel fatigue test device based on structure test platform, including 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 arranged; a test piece is commonly installed between the loading cross beam (100) and the fixed cross beam (600) at intervals, and actuators (500) are commonly and symmetrically installed between the loading cross beam (100) and the fixed cross beam (600) which are positioned at two sides of the test piece; the two groups of actuators (500) act on the loading cross beam (100) at the same time, and the loading cross beam (100) is stressed to generate rolling friction or movement under sliding friction relative to the rolling support (200);
the end faces of piston rods at the output ends of the two groups of actuators (500) are connected with the loading cross beam (100) through cylindrical connectors (400); the cylindrical surface connector (400) comprises a convex surface connecting part (402) and a concave surface connecting part (401) which are mutually matched through a concave surface and a convex surface;
flanges are respectively and outwards extended along the circumferential direction on the convex surface connecting part (402) and the concave surface connecting part (401), a safety retraction pull rod (403) which is uniformly arranged along the circumferential direction is arranged between the two flanges, the convex surface and the concave surface opposite to the convex surface connecting part (402) and the concave surface connecting part (401) are contacted, and the structural centering change caused by the elastic deformation of the loading beam is eliminated through the relative rotation of the concave-convex connecting parts;
when the loading cross beam (100) and the rolling support (200) are in small displacement, rolling friction is generated between the loading cross beam and the rolling support; when the loading cross beam (100) and the rolling support (200) are in large displacement, sliding friction is formed between the loading cross beam and the rolling support;
the rolling support (200) has the structure that: the device comprises a base (201) arranged on a structure test 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 grooves, 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 cross beam (100), and the bottom surface of the sliding plate (205) is contacted with the rolling bodies (204).
2. The parallel fatigue testing device based on the structural testing platform as claimed in claim 1, wherein: the opposite ends of the convex connecting part (402) and the concave connecting part (401) are respectively provided with a matched convex structure and a matched 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 cross beam (100) and the end surface of a piston rod of the actuator (500).
3. The parallel fatigue testing device based on the structural testing platform as claimed in claim 1, wherein: the strength of the safety retraction pull rod (403) is smaller than that of the mounting bolts between the two ends of the cylindrical surface connector (400) and the loading cross beam (100) and the actuator (500).
4. The parallel fatigue testing device based on the structural testing platform as claimed in claim 1, wherein: the adjusting wedges (202) are movably arranged on the bases (201) around the supporting seat (203), the supporting seat (203) is supported on the adjusting wedges (202), and the supporting seat (203) and the adjusting wedges (202) are in inclined plane fit; the adjusting wedge block (202) moves relative to the base (201) through screw rod rotation, and the adjusting wedge block (202) adjusts the height of the support (203) relative to the base (201) through the matched inclined plane.
5. The parallel fatigue testing device based on the structural testing platform as claimed in claim 1, wherein: square round angle holes are formed in the middle of the front and rear penetrating loading cross beam (100), the same square round angle holes are formed in the front and rear penetrating fixing cross beam (600), and the two square round angle holes are concentrically arranged.
6. The parallel fatigue testing device based on the structural testing platform as claimed in 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 a servo controller, and the servo controller acquires data of the displacement sensor and the force sensor 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 is used for following 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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