Electro-hydraulic dynamic and static integrated fatigue test system for special environment

Abstract

The invention discloses an electro-hydraulic dynamic and static integrated fatigue test system for a special environment, and relates to the technical field of fatigue test detection of metal materials, in particular to an electro-hydraulic dynamic and static integrated fatigue test system for a special environment, comprising: a bearing assembly comprising a first bearing beam and a second bearing beam which are relatively fixed; the static load loading assembly comprises a loading beam and a lead screw power mechanism for driving the loading beam to move, the moving direction of the loading beam is consistent with the direction of a connecting line of the first bearing beam and the second bearing beam, and the lead screw power mechanism is fixedly arranged relative to the first bearing beam or the second bearing beam; and the dynamic load loading assembly comprises a static pressure actuator, the static pressure actuator and the first bearing beam or the second bearing beam are relatively and fixedly arranged, and the force application axis direction of the static pressure actuator is consistent with the movement direction of the loading beam.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue test detection of metal materials, and more specifically to an electro-hydraulic dynamic-static integrated fatigue test system for special environments. Background Art

[0002] The research on the mechanical service performance test of metal materials / components is an important support for the performance test of key components in many fields such as aerospace, vehicles, and rail transit. At present, electro-hydraulic servo fatigue testing machines and electromagnetic resonance fatigue testing machines are mainly used to carry out stress fatigue mechanical performance tests of materials / components, and electronic universal testing machines and hydraulic universal testing machines are mainly used to carry out static tests of materials / components. However, with the sharp compression of the material / component test cycle, the reciprocating switching of dynamic and static tests has greatly affected the test efficiency, and multiple devices have increased the test cost.

[0003] In summary, how to solve the problem in the prior art that the mechanical service performance testing of metal materials / components requires the participation of multiple devices, resulting in low testing efficiency and high costs is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an electro-hydraulic static-dynamic fatigue testing system for special environments, which integrates a static loading assembly and a dynamic loading assembly, uses two power systems to achieve high-precision mechanical loading, and is integrated into one device, effectively reducing testing costs and improving testing efficiency.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An electro-hydraulic dynamic and static integrated fatigue test system for special environments, comprising:

[0007] The bearing assembly comprises a first bearing beam and a second bearing beam which are relatively fixed;

[0008] A static loading assembly, comprising a loading beam and a screw power mechanism for driving the loading beam to move, wherein the movement direction of the loading beam is consistent with the direction of the line connecting the first load-bearing beam and the second load-bearing beam, and the screw power mechanism is fixedly arranged relative to the first load-bearing beam or the second load-bearing beam;

[0009] The dynamic load loading assembly comprises a static pressure actuator, which is fixedly arranged relative to the first load-bearing beam or the second load-bearing beam, and the force axis direction of the static pressure actuator is consistent with the movement direction of the loading beam.

[0010] Preferably, the bearing assembly further includes a plurality of groups of support rods, which are arranged along a connecting line between the first bearing beam and the second bearing beam, and have two ends fixedly connected to the first bearing beam and the second bearing beam, respectively.

[0011] Preferably, the screw power mechanism also includes a motor and at least two groups of screw assemblies, the motor is fixedly arranged relative to the first load-bearing beam, and the motor is dynamically connected to the rotating parts of all the screw assemblies through a reducer and a synchronous transmission mechanism, the two ends of the rotating parts of the screw assemblies are respectively rotatably connected to the load-bearing assembly, and the loading beam is fixedly connected to the rolling part of the screw assembly.

[0012] Preferably, a through hole is provided in the loading beam for allowing the force-applying end of the static pressure actuator to pass through.

[0013] Preferably, a sensor assembly is provided on a side of the loading beam close to the first load-bearing beam or the second load-bearing beam, and a centerline direction of the sensor assembly is consistent with a movement direction of the loading beam.

[0014] Preferably, the sensor assembly comprises a sensor flange and a force sensor, and the force sensor is fixedly connected to the sensor flange;

[0015] Threaded holes for bolt connection are arranged between the sensor flange, the force-applying end of the static pressure actuator and the loading beam.

[0016] Preferably, the force-applying end of the static pressure actuator is coaxially provided with an adapter sleeve, the force-applying end and the adapter sleeve are connected by an adapter rod, both ends of the adapter rod are provided with external threads, the force-applying end and the adjacent ends of the adapter sleeve are both provided with threaded holes for connection with the external threads, and a locking pad is provided between the adjacent ends of the force-applying end and the adapter sleeve, and the locking pad is a circular ring structure with two sets of wedge surfaces fitting each other.

[0017] Preferably, it also includes a lifting assembly, which includes a mounting plate and a driving assembly for driving the mounting plate to move, the driving assembly is fixedly arranged relative to the load-bearing assembly, the mounting plate is used to install and fix the special environment device, and the movement direction of the mounting plate is parallel or perpendicular to the connection direction of the first load-bearing beam and the second load-bearing beam, so as to enable the special environment device to enter or move away from the space between the first load-bearing beam and the second load-bearing beam.

[0018] Preferably, a through hole is provided on the surface of the second load-bearing beam for allowing the special environment device to penetrate;

[0019] The lifting assembly further comprises a plurality of guide posts slidably arranged with the second load-bearing beam, the guide posts are fixedly arranged with the mounting plate, and the length direction of the guide posts is consistent with the connection direction of the first load-bearing beam and the second load-bearing beam;

[0020] The driving assembly comprises two groups of telescopic rods which are arranged in parallel and fixedly connected to the mounting plate, and a hydraulically controlled valve block is arranged in the driving oil circuit of the telescopic rods.

[0021] Preferably, the surface of the second load-bearing beam is provided with a penetrating guide hole for allowing the guide column to slide through, and a connecting plate is provided at one end of the guide column passing through the guide hole, and a limiter is provided in the connecting plate for abutting against the second load-bearing beam to achieve limiting.

[0022] The electro-hydraulic dynamic-static integrated fatigue test system for special environments provided by the present invention has at least the following beneficial effects compared with the prior art:

[0023] 1. The static loading assembly and dynamic loading assembly are integrated at the same time, which can realize fatigue test and high-precision static test, realizing multiple uses of one machine;

[0024] 2. At the same time, the static loading assembly adopts a screw power mechanism for loading, which has the advantages of small size, large stroke, and high mechanical loading accuracy; the dynamic loading assembly adopts a static pressure actuator for loading, which has the ability of high-frequency force loading, thereby improving the efficiency of the test results of the workpiece;

[0025] 3. Set up the load-bearing assembly, use one set of load-bearing beams as the reaction point to fix the test workpiece, and use the other set of load-bearing beams for the static load assembly and the dynamic load assembly to ensure that the force of the entire system is stable during the workpiece testing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the electro-hydraulic dynamic-static integrated fatigue test system for special environments provided by the present invention;

[0028] Figure 2 It is a structural schematic diagram of a specific load-bearing assembly provided by the present invention;

[0029] Figure 3This is a structural schematic diagram of a specific lifting assembly provided by the present invention;

[0030] Figure 4 It is a structural schematic diagram of a specific dynamic load loading assembly and a static load loading assembly provided by the present invention;

[0031] FIG. 5 is a schematic diagram of the assembly of the force-applying end and the adapter sleeve of the specific static pressure actuator provided by the present invention.

[0032] Figure 1 - In Figure 5:

[0033] 1. Static load loading assembly; 101. Motor; 102. Synchronous transmission mechanism; 103. Screw assembly; 104. Loading beam;

[0034] 2. Dynamic loading assembly; 201. Static pressure actuator; 202. Adapter sleeve; 203. Adapter rod; 204. Locking pad;

[0035] 3. Bearing assembly; 301. First bearing beam; 302. Second bearing beam; 303. Support rod;

[0036] 4. Lifting assembly; 401. Mounting plate; 402. Guide column; 403. Telescopic rod; 404. Connecting plate; 405. Stopper;

[0037] 5. Special environmental equipment;

[0038] 6. Sensor assembly; 601. Force sensor; 602. Sensor flange. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The core of the present invention is to provide an electro-hydraulic static-dynamic fatigue testing system for special environments, which integrates static loading assembly and dynamic loading assembly, uses two power systems to achieve high-precision mechanical loading, and is integrated into one device, effectively reducing testing costs and improving testing efficiency.

[0041] Please refer to Figure 1 - Figure 5, an electro-hydraulic dynamic and static integrated fatigue test system for special environments, comprising:

[0042] The bearing assembly 3 includes a first bearing beam 301 and a second bearing beam 302 which are relatively fixed;

[0043] The static loading assembly 1 includes a loading beam 104 and a screw power mechanism for driving the loading beam 104 to move. The movement direction of the loading beam 104 is consistent with the direction of the connection line between the first load-bearing beam 301 and the second load-bearing beam 302. The screw power mechanism is relatively fixedly arranged with the first load-bearing beam 301 or the second load-bearing beam 302.

[0044] The dynamic load assembly 2 includes a static pressure actuator 201 , which is fixedly arranged relative to the first load beam 301 or the second load beam 302 , and the force axis direction of the static pressure actuator 201 is consistent with the movement direction of the loading beam 104 .

[0045] like Figure 1 As shown, by relatively fixedly arranging the first load beam 301 and the second load beam 302, the workpiece can be stably stressed during testing. For example, the second load beam 302 is selected as the reaction point and fixedly connected to one end of the workpiece, and the static load assembly 1 or the dynamic load assembly 2 is used to be fixedly connected to the other end of the workpiece, thereby achieving the purpose of applying static load force and dynamic load force to the workpiece;

[0046] Meanwhile, if the second load beam 302 is used as the reaction point, the static load assembly 1 and the dynamic load assembly 2 need to be arranged relatively fixedly with respect to the first load beam 301, that is, Figure 2 and Figure 4 As shown, the reaction forces of the static loading assembly 1 and the dynamic loading assembly 2 when doing work both act on the first load beam 301, so that the force of the entire system is balanced;

[0047] like Figure 2 As shown, in the static load loading assembly 1, a screw power mechanism is used to drive the loading beam 104 to move, so as to change the distance between the loading beam 104 and the first load beam 301 and / or the second load beam 302, thereby changing the static load force borne by the workpiece. At the same time, the use of the screw power mechanism is helpful to improve the accuracy of static load loading. At the same time, when the size difference of the workpiece is large, the screw power mechanism can achieve a larger stroke with a smaller volume structure, so as to reduce the space occupied in the load bearing assembly 3, thereby meeting the arrangement requirements of the special environment device 5 in the load bearing assembly 3;

[0048] like Figure 4 As shown, the dynamic load loading assembly 2 adopts a static pressure actuator 201, which is driven by oil pressure and controlled by a servo valve, and can achieve high-frequency and high-precision force loading to meet the needs of dynamic load testing;

[0049] And during the test process, the movement direction of the loading beam 104 is the force loading direction of the static load loading assembly 1, and the force direction of the static pressure actuator 201 is the force loading direction of the dynamic load loading assembly 2. Therefore, the force loading directions of the static load loading assembly 1 and the dynamic load loading assembly 2 are consistent. Furthermore, during the test process, the same reaction point can be selected for the dynamic and static load tests. For example, the second load beam 302 is selected as the reaction point to fix the workpiece. That is, when switching between dynamic and static load tests, only the loading assembly end needs to be replaced, which helps to improve the test efficiency.

[0050] In some embodiments, the bearing assembly 3 further includes a plurality of support rods 303, which are arranged along the connecting line of the first bearing beam 301 and the second bearing beam 302, and the two ends of the support rods 303 are respectively fixedly connected to the first bearing beam 301 and the second bearing beam 302;

[0051] The first load beam 301 and the second load beam 302 are supported by providing a support rod 303, and the support direction is consistent with the direction of the workpiece test loading force, which effectively ensures the relative position stability of the first load beam 301 and the second load beam 302 and ensures the stability of equipment use.

[0052] In some embodiments, the screw power mechanism further includes a motor 101 and at least two groups of screw assemblies 103, the motor 101 is fixedly arranged relative to the first load-bearing beam 301, and the motor 101 is dynamically connected to the rotating parts of all the screw assemblies 103 through a reducer and a synchronous transmission mechanism 102, the two ends of the rotating parts of the screw assemblies 103 are respectively rotatably connected to the load-bearing assembly 3, and the loading beam 104 is fixedly connected to the rolling part of the screw assembly 103;

[0053] like Figure 2 As shown, at least two groups of lead screw assemblies 103 are used to support the loading beam 104 to ensure the stability of its movement, and in order to ensure the synchronous rotation of the rotating parts of the multiple groups of lead screw assemblies 103, the motor 101 and the rotating parts of the multiple groups of lead screw assemblies 103 are connected by a reducer and a synchronous transmission mechanism 102, wherein the synchronous transmission mechanism 102 is preferably a combination of a synchronous toothed wheel and a synchronous belt, and a tensioning wheel is also integrated to keep the synchronous belt tensioned to ensure that the rotating parts of the multiple groups of lead screw assemblies 103 can rotate synchronously;

[0054] In actual use, several groups of travel switches are arranged at specific positions between the first load-bearing beam 301 and the second load-bearing beam 302 to limit the maximum travel of the loading beam 104 and avoid collision between the loading beam 104 and the load-bearing beam, which helps to ensure the accuracy of the equipment.

[0055] In some embodiments, a through hole is provided in the loading beam 104 for allowing the force-applying end of the static pressure actuator 201 to pass through;

[0056] The loading directions of the dynamic load loading assembly 2 and the static load loading assembly 1 are consistent. Therefore, a through hole is set on the loading beam 104 for the force-applying end of the static pressure actuator 201 to pass through, so that the loading beam 104 can be avoided during the dynamic load test, that is, the interference of the loading beam 104 with the workpiece or other tooling in the dynamic load test can be avoided, further reducing the space occupied by the static load loading assembly 1 and / or the dynamic load loading assembly 2 in the load-bearing assembly 3, thereby facilitating the arrangement of the special environment device 5.

[0057] In some embodiments, a sensor assembly 6 is disposed on one side of the loading beam 104 close to the first load beam 301 or the second load beam 302 , and the centerline direction of the sensor assembly 6 is consistent with the movement direction of the loading beam 104 ;

[0058] During the static load test, the main test is the tensile test of the workpiece. One end of the workpiece is fixedly connected to the second load-bearing beam 302 through a tooling, and the other end is fixed to the sensor assembly 6. The sensor assembly 6 is fixedly connected to the loading beam 104. The static load of the workpiece is completed through the movement of the loading beam 104, and the sensor assembly 6 can directly detect the static load amount.

[0059] In some embodiments, the sensor assembly 6 includes a sensor flange 602 and a force sensor 601 , and the force sensor 601 is fixedly connected to the sensor flange 602 ;

[0060] Threaded holes for bolt connection are provided between the sensor flange 602 and the force-applying end of the static pressure actuator 201 and the loading beam 104;

[0061] No matter in static load or dynamic load test, one end of the workpiece is fixedly connected to the force sensor 601 through the fixture to detect the load amount. The difference is that in static load test, the sensor flange 602 needs to be fixedly connected to the loading beam 104 through bolts so that the force sensor 601 detects the static load amount; while in dynamic load test, the sensor flange 602 needs to be fixedly connected to the force-applying end of the static pressure actuator 201 through bolts so that the force sensor 601 detects the dynamic load amount; that is, static load test and dynamic load test can share a set of sensor assemblies 6, thereby further simplifying the system structure and reducing the test cost;

[0062] like Figure 2 and Figure 4As shown, the sensor flange 602 is a circular ring structure, which is mounted on the outside of the force-applying end of the static pressure actuator 201 and arranged at the upper end surface of the through hole of the loading beam 104. The sensor flange 602 is provided with threaded holes connected to the loading beam 104 along its own axis, and threaded holes connected to the force-applying end of the static pressure actuator 201 along its own radial direction. In different test links, only the threaded holes connected by the bolts need to be replaced to replace the main body connected to the sensor assembly 6, thereby realizing the sharing of the sensor assembly 6.

[0063] In some embodiments, the force-applying end of the static pressure actuator 201 is coaxially provided with an adapter sleeve 202, and the force-applying end and the adapter sleeve 202 are connected by an adapter rod 203, both ends of the adapter rod 203 are provided with external threads, and the force-applying end and the adjacent ends of the adapter sleeve 202 are both provided with threaded holes for connecting with the external threads, and a locking washer 204 is commonly abutted between the adjacent ends of the force-applying end and the adapter sleeve 202, and the locking washer 204 is a circular ring structure with two sets of wedge surfaces that fit each other;

[0064] In actual use, the force-applying end of the hydrostatic actuator 201 is short and insufficient to penetrate the loading beam 104. Therefore, an adapter sleeve 202 is added to its force-applying end to increase its effective length. An adapter rod 203 with threaded connections at both ends is used for connection, which can effectively ensure the coaxiality of the hydrostatic actuator 201 and the adapter sleeve 202. By providing a locking washer 204, the thread gap existing in the threaded connection can be effectively eliminated, so that there is no axial movable mass between the force-applying end of the hydrostatic actuator 201 and the adapter sleeve 202.

[0065] In some embodiments, a lifting assembly 4 is also included, and the lifting assembly 4 includes a mounting plate 401 and a driving assembly for driving the mounting plate 401 to move. The driving assembly is relatively fixedly arranged with the load-bearing assembly 3. The mounting plate 401 is used to install and fix the special environment device 5. The movement direction of the mounting plate 401 is parallel or perpendicular to the connection direction of the first load-bearing beam 301 and the second load-bearing beam 302, so as to enable the special environment device 5 to enter or move away from the space between the first load-bearing beam 301 and the second load-bearing beam 302.

[0066] When testing the mechanical properties of materials, it is necessary to consider the performance of the materials in different environments, such as high temperature, high humidity, high corrosion, etc. Therefore, the environment can be simulated by a special environment device 5. During the test, the workpiece only needs to be placed in the special environment device 5;

[0067] Therefore, a lifting assembly 4 is provided to drive the installation fixing plate 401 installed with the special environment device 5 to move, so as to realize the automatic arrangement and evacuation of the special environment device 5 .

[0068] In some embodiments, a through hole is provided on the surface of the second load beam 302 for the special environment device 5 to penetrate;

[0069] The lifting assembly 4 further includes a plurality of guide posts 402 arranged in a sliding manner with the second load beam 302. The guide posts 402 are fixedly arranged with the mounting plate 401, and the length direction of the guide posts 402 is consistent with the direction of the connection line between the first load beam 301 and the second load beam 302.

[0070] The driving assembly includes two sets of telescopic rods 403 which are arranged in parallel and fixedly connected to the mounting plate 401 . A hydraulically controlled valve block is arranged in the driving oil circuit of the telescopic rods 403 .

[0071] The special environment device 5 that can be put on the ground can be directly put in from the gap between the first load beam 301 and the second load beam 302, but the special environment device 5 with a larger volume cannot be put in from the gap between the first load beam 301 and the second load beam 302. Therefore, a through hole is set on the top of the second load beam 302 so that the special environment device 5 can enter from the bottom, and the lifting assembly 4 is used to support the special environment device 5 to ensure its stability during the working process;

[0072] At the same time, a hydraulic control valve block is arranged in the oil circuit of the telescopic rod 403. By controlling the on and off of the hydraulic control valve block, the self-locking of the length of the telescopic rod 403 and the control of the lifting speed can be realized, thereby achieving precise control.

[0073] In some embodiments, the exterior of the special environment device 5 is in the form of a stepped shaft, which passes through the through hole of the second load-bearing beam 302 and enters the load-bearing assembly 3. The stepped surface of the special environment device 5 abuts against the end of the through hole of the second load-bearing beam 302, and the special environment device 5 is fixedly connected to the second load-bearing beam 302 by bolts. At this time, the fixing tool at the end of the workpiece is relatively fixedly connected to the special environment device 5, and is indirectly fixedly connected to the second load-bearing beam 302, thereby making the second load-bearing beam 302 a reaction point.

[0074] In some embodiments, a guide hole is provided on the surface of the second load beam 302 for sliding the guide column 402 through the guide hole. A connecting plate 404 is provided at one end of the guide column 402 passing through the guide hole. A stopper 405 capable of abutting against the second load beam 302 to achieve position limiting is provided in the connecting plate 404.

[0075] The end of the movable end of the guide column 402 is connected by the connecting plate 404, so that the guide column 402, the mounting plate 401 and the connecting plate 404 form a closed frame structure with high stability, and by setting a limiter 405 in the connecting plate 404, the maximum movement of the guide column 402 is limited to prevent the lifting assembly 4 from being separated from the second load-bearing beam 302, thereby maintaining the stability of the equipment.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The above is a detailed introduction to the electro-hydraulic dynamic-static integrated fatigue testing system for special environments provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electro-hydraulic dynamic and static integrated fatigue test system for special environments, characterized in that: include: A bearing assembly (3) comprising a first bearing beam (301) and a second bearing beam (302) which are relatively fixed; A static load loading assembly (1), comprising a loading beam (104) and a screw power mechanism for driving the loading beam (104) to move, wherein the movement direction of the loading beam (104) is consistent with the direction of a line connecting the first load-bearing beam (301) and the second load-bearing beam (302), and the screw power mechanism is fixedly arranged relative to the first load-bearing beam (301) or the second load-bearing beam (302); The dynamic load loading assembly (2) comprises a static pressure actuator (201), wherein the static pressure actuator (201) is fixedly arranged relative to the first load-bearing beam (301) or the second load-bearing beam (302), and the force application axis direction of the static pressure actuator (201) is consistent with the movement direction of the loading beam (104).

2. The electro-hydraulic dynamic-static integrated fatigue test system for special environments according to claim 1, characterized in that: The bearing assembly (3) further comprises a plurality of groups of support rods (303), wherein the support rods (303) are arranged along a line connecting the first bearing beam (301) and the second bearing beam (302), and the two ends of the support rods are respectively fixedly connected to the first bearing beam (301) and the second bearing beam (302).

3. The electro-hydraulic dynamic-static integrated fatigue test system for special environments according to claim 1, characterized in that: The screw power mechanism further comprises a motor (101) and at least two groups of screw assemblies (103); the motor (101) and the first load-bearing beam (301) are fixedly arranged relative to each other, and the motor (101) is dynamically connected to the rotating parts of all the screw assemblies (103) via a reducer and a synchronous transmission mechanism (102); both ends of the rotating parts of the screw assemblies (103) are respectively rotationally connected to the load-bearing assembly (3); and the loading beam (104) is fixedly connected to the rolling parts of the screw assemblies (103).

4. The electro-hydraulic dynamic-static integrated fatigue test system for special environments according to claim 3, characterized in that: A through hole is provided in the loading beam (104) for allowing the force-applying end of the static pressure actuator (201) to penetrate through it.

5. The electro-hydraulic dynamic-static integrated fatigue testing system for special environments according to claim 3, characterized in that: A sensor assembly (6) is provided on one side of the loading beam (104) close to the first load-bearing beam (301) or the second load-bearing beam (302), and the centerline direction of the sensor assembly (6) is consistent with the movement direction of the loading beam (104).

6. The electro-hydraulic dynamic-static integrated fatigue test system for special environments according to claim 5, characterized in that: The sensor assembly (6) comprises a sensor flange (602) and a force sensor (601), wherein the force sensor (601) is fixedly connected to the sensor flange (602); Threaded holes for bolt connection are provided between the sensor flange (602), the force-applying end of the static pressure actuator (201), and the loading beam (104).

7. The electro-hydraulic dynamic-static integrated fatigue testing system for special environments according to claim 1, characterized in that: The force-applying end of the static pressure actuator (201) is coaxially provided with an adapter sleeve (202); the force-applying end and the adapter sleeve (202) are connected via an adapter rod (203); both ends of the adapter rod (203) are provided with external threads; the force-applying end and the adjacent ends of the adapter sleeve (202) are both provided with threaded holes for connection with the external threads; and a locking washer (204) is provided between the adjacent ends of the force-applying end and the adapter sleeve (202) in abutment with each other; the locking washer (204) is a circular ring structure with two sets of wedge surfaces fitting each other.

8. The electro-hydraulic dynamic-static integrated fatigue testing system for special environments according to any one of claims 1 to 7, characterized in that: The invention also comprises a lifting assembly (4), the lifting assembly (4) comprising a mounting plate (401) and a driving assembly for driving the mounting plate (401) to move, the driving assembly being fixedly arranged relative to the bearing assembly (3), the mounting plate (401) being used for mounting and fixing a special environment device (5), the movement direction of the mounting plate (401) being parallel or perpendicular to the direction of the line connecting the first bearing beam (301) and the second bearing beam (302), and being used for enabling the special environment device (5) to enter or move away from the space between the first bearing beam (301) and the second bearing beam (302).

9. The electro-hydraulic dynamic-static integrated fatigue test system for special environments according to claim 8, characterized in that: A through hole is provided on the surface of the second load-bearing beam (302) for allowing the special environment device (5) to penetrate through; The lifting assembly (4) further comprises a plurality of guide columns (402) slidably arranged with the second load-bearing beam (302), the guide columns (402) being fixedly arranged with the mounting fixing plate (401), and the length direction of the guide columns (402) being consistent with the direction of the connection line between the first load-bearing beam (301) and the second load-bearing beam (302); The driving assembly comprises two groups of telescopic rods (403) arranged in parallel and fixedly connected to the mounting fixing plate (401), and a hydraulically controlled valve block is arranged in the driving oil circuit of the telescopic rods (403).

10. The electro-hydraulic dynamic-static integrated fatigue test system for special environments according to claim 9, characterized in that: A penetrating guide hole is provided on the surface of the second bearing beam (302) for allowing the guide column (402) to slide through, and a connecting plate (404) is provided at one end of the guide column (402) penetrating the guide hole, and a stopper (405) capable of abutting against the second bearing beam (302) to achieve position limiting is provided in the connecting plate (404).

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