A multi-dimensional life assessment test device for high load-bearing resistance struts

Abstract

This invention discloses a multi-dimensional life assessment test device for high-load-bearing resistance struts. The invention includes: a cyclic load loading device, which achieves precise loading and measurement through a loading actuator, a reaction support, and sensors; a guide rail control device, which simulates actual complex motion patterns using guide rails, sliders, and spherical bearings; a wear assessment device, which simulates wear under actual complex motion patterns at the piston end and fixed end; a temperature control system, which achieves precise control of ambient and operating temperatures using a high-low temperature environment chamber and a hydraulic oil temperature controller; and an MTS structural test loading system, which controls the oil flow in and out of the loading actuator and the resistance strut, and displays sensor data in real time. This invention can comprehensively evaluate the wear resistance, sealing performance, fatigue performance, and overall reliability of resistance struts by simulating multi-physical field coupling conditions such as cyclic loads, composite wear, and high-low temperature environments, providing effective technical support for life prediction and reliability design.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, more particularly, to a high load resistance strut multi-dimensional life evaluation test device and method. BACKGROUND

[0002] The high load resistance strut of an airplane is one of the key load-bearing components in the landing gear system, and its performance is directly related to the safety and overall reliability of the airplane during the take-off and landing phases. During actual operation, this component frequently bears high-frequency and large-amplitude tensile and compressive alternating loads during airplane take-off and landing, so it has very high requirements for its durability, reliability and overall performance. In order to truly reflect the performance of the high load resistance strut in the service environment, it is necessary to conduct a comprehensive life evaluation through a systematic fatigue loading test that simulates actual working conditions. Such a test usually inputs a specified amount of displacement, cyclic load and temperature environment to reproduce the comprehensive stress state involved in various working conditions such as take-off and landing, and then to examine the wear resistance, sealing performance and structural integrity of the test piece under long-term reciprocating action, providing data support for life prediction, reliability optimization and maintenance cycle of the high load resistance strut device.

[0003] However, there is still a lack of mature special test devices and methods for the life test of such components. Existing equipment is often single-function, and it is difficult to achieve comprehensive performance verification of multiple parameters under coupled conditions, and it cannot accurately simulate the durability and failure behavior of the component in the real environment. Therefore, in order to systematically evaluate the wear resistance, sealing performance, fatigue performance and overall reliability of the front landing gear resistance strut, it is urgent to develop a comprehensive test device that can realize the coordinated action of multiple dimensions and multiple parameters, so as to provide solid technical support for the life evaluation and reliability design of the front landing gear resistance strut. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the deficiencies in the prior art, and to provide a high load resistance strut multi-dimensional life evaluation test device, which can more realistically simulate the working state of the front landing gear resistance strut of an airplane during take-off and landing in the actual flight process, and comprehensively examine its working performance, thereby providing effective technical support for the life evaluation and reliability design of the front landing gear resistance strut of an airplane.

[0005] The high load resistance strut multi-dimensional life evaluation test device of the present application is realized by the following technical solution, which comprises a cyclic load loading device, a guide rail control device, a wear examination device, a temperature control system and an MTS structural test loading system.

[0006] The cyclic load loading device comprises a loading actuator, an actuator fixing support, a left counter-force support, a loading lug, a force sensor and a displacement sensor; the loading actuator is fixedly installed at two ends of the left counter-force support and the actuator fixing support respectively, the movable end of the loading actuator is fixed with the loading lug through bolts, the loading lug is connected with the piston end of the resistance support rod as a whole through a pin shaft and is placed in a slider on a guide rail, the force sensor is installed at the movable end of the loading actuator, the fixed end of the resistance support rod is fixed with the support lug fixing plate on the right counter-force support, and the displacement sensor is installed on the resistance support rod to monitor the displacement of the resistance support rod by monitoring the elongation and shortening of the resistance support rod.

[0007] The guide rail control device comprises a guide rail support, guide rails, a pin shaft, a slider, a slide rail fixing lug and a lug joint bearing; two parallel guide rails are installed on the top surface of the guide rail support respectively; the slider is screwed with the slide rail fixing lug, the slider is placed on the guide rail, the upper part of the slide rail fixing lug is provided with a lug joint bearing for rotation of the pin shaft, and the guide rail support is fixedly connected with the floor through bolts.

[0008] The wear examination device comprises a piston end wear examination device and a fixed end wear examination device; the piston end wear examination device comprises a rotating gear, a rack, an adapter flange and a fixed clamp; the pin shaft penetrates through the piston end of the resistance support rod, the loading lug, the slide rail fixing lug, the adapter flange and the rotating gear, the pin shaft is matched with the adapter flange through a hexagonal key, the adapter flange is connected with the rotating gear through bolts, and the rotating gear is reinforced by using a sleeve fixed clamp; the fixed end wear examination device comprises a servo electric cylinder, a servo electric cylinder support, a shaft sleeve and a force transmission fixed rod; the fixed end mounting hole shaft sleeve is connected with the servo electric cylinder through bolts, is directly driven to rotate by the servo electric cylinder, and is rotated relative to the fixed end lug hole, so that the examination of the fixed end joint bearing is realized.

[0009] The temperature control system comprises a special high-low temperature environment box, a hydraulic oil temperature machine and a temperature sensor; two oil ports of the resistance support rod are connected to the hydraulic oil temperature machine through hydraulic oil pipes, and the hydraulic oil temperature machine is provided with the temperature sensor;

[0010] The MTS structure test loading system controls the loading actuator and the resistance support rod to enter and exit oil, and displays real-time data of the force sensor and the displacement sensor.

[0011] The temperature control system comprises an ambient temperature loading device and a working temperature loading device, the ambient temperature loading device is used for wrapping the resistance support rod through a high-low temperature environment box (a high-low temperature environment box specially customized for the resistance support rod, which is equivalent to a cylindrical barrel capable of changing temperature to wrap the resistance support rod), and sealing is performed by using thermal insulation cotton, the test environment temperature is directly adjusted by the high-low temperature environment box, and precise control is realized through temperature feedback; the working temperature loading device is used for using a hydraulic oil temperature machine, a pipe nozzle A and a pipe nozzle B on the pipe body of the resistance support rod are connected to the hydraulic oil temperature machine through high-low temperature resistant hydraulic oil pipes, respectively, a temperature sensor is arranged in the hydraulic oil temperature machine, and the working liquid temperature is stably controlled in the test requirement range: -55 DEG C to +100 DEG C.

[0012] The MTS structure test loading system controls the loading actuating cylinder, specifically: a hydraulic source is connected to the loading actuating cylinder through a servo valve, and the MTS structure test loading system controls the servo valve; the servo valve is composed of a high-pressure oil inlet channel P, a system oil return channel T and oil ports A and B, and reciprocating movement of the loading actuating cylinder is realized through connection of the high-pressure oil inlet channel P and the system oil return channel T with the oil ports A and B; when the high-pressure oil inlet channel P is connected with the oil port A and the system oil return channel T is connected with the oil port B, elongation work of the loading actuating cylinder is realized; when the high-pressure oil inlet channel P is connected with the oil port B and the system oil return channel T is connected with the oil port A, contraction work of the loading actuating cylinder is realized.

[0013] The MTS structure test loading system controls resistance support rod oil inlet and outlet, specifically: the resistance support rod is of a single-cavity structure and is provided with an oil inlet hole and an oil outlet hole, the resistance support rod is filled with oil through the oil inlet hole and discharges the oil through the oil outlet hole; a hydraulic source is connected to the resistance support rod through a proportional pressure reducing valve, and the MTS structure test loading system controls the proportional pressure reducing valve.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The present application constructs a comprehensive test environment of multi-physical field coupling: innovatively integrates three systems of cyclic load loading, rotary wear simulation and high-low temperature change environment, realizes multi-dimensional, full-condition synchronous examination of wear resistance, sealing performance and working reliability of the high-bearing resistance support rod on a single test platform.

[0016] The present application realizes full-condition, high-efficiency synchronous verification: the comprehensive test environment changes the mode that the traditional test device can only perform single item examination, can synchronously apply mechanical load, compound motion and temperature change environment on one device, greatly shortens the test period, and the examination result can truly reflect the comprehensive performance of the product under the multi-field coupling, especially can expose potential faults such as sealing element failure and material performance attenuation under single condition, and provides unprecedented comprehensive data support for product reliability evaluation.

[0017] The application designs a synergistic composite wear evaluation mechanism: in view of the complex motion form of the resistance strut in the actual working condition, the linear motion controlled by the guide rail, the rotary motion of the piston end gear rack and the rotation driven by the fixed end servo cylinder are combined innovatively, so that the wear condition of the joint bearing under the working condition of simultaneously bearing axial force and rotary torque is accurately simulated, which far exceeds the evaluation ability of the traditional single motion form.

[0018] The application significantly improves the authenticity and accuracy of wear evaluation: the composite wear mechanism accurately reproduces the complex motion form of stretching and rotating of the resistance strut during take-off and landing, so that the wear condition of the key parts of the joint bearing is highly consistent with the real service state. The wear data and life prediction obtained are more accurate and reliable, which can effectively guide design improvement and reduce the risk of on-site failure caused by insufficient design verification from the source.

[0019] The application realizes intelligent coordinated control of load and motion: the MTS structural test loading system is adopted to control the working state of the loading actuator cylinder and the resistance strut, and through the closed-loop control strategy of displacement control and pressure feedback, it is ensured that the internal pressure of the resistance strut can accurately reach the specified load value in real time while the displacement loading is carried out according to the predetermined curve, so as to ensure the accurate reproduction of the complex loading spectrum and the synchronous coordination of each dimension action.

[0020] The application ensures the accurate reproduction of the test process and the high reliability of the results: the MTS structural test loading system controls the loading actuator cylinder and the resistance strut through real-time feedback of displacement and pressure, so as to ensure that even in complex conditions such as change of material properties caused by temperature change and fluctuation of friction coefficient, the load spectrum and motion trajectory of each test cycle can still remain highly consistent. This eliminates the additional variables introduced by insufficient control accuracy, so that the test data has good repeatability and strong comparability, which provides a solid technical guarantee for accurately evaluating product life and performance degradation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole schematic diagram of the device,

[0022] Figure 2 It is a guide rail control device,

[0023] Figure 3 It is a piston end wear evaluation device,

[0024] Figure 4 It is a fixed end wear evaluation system,

[0025] Figure 5 Environmental temperature loading schematic diagram,

[0026] Figure 6 Working temperature loading schematic diagram,

[0027] Figure 7 The schematic diagram of the loading system for the MTS structure test,

[0028] Figure 8 The schematic diagram of the resistance strut device. DETAILED DESCRIPTION

[0029] In order to enable the above-mentioned objects, features and advantages of the present application to be clearer, the present application will be described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments and features in the embodiments can be combined with each other without conflict. In the following description, a large number of specific details are described in order to facilitate a full understanding of the present application, and the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0030] Figure 1 The schematic diagram of the device as a whole, the loading actuator cylinder 1 and the resistance strut 4 are fixed on the left counterforce support 301 and the right counterforce support 302 respectively, and the loading actuator cylinder 1 is installed to the actuator cylinder fixing support 2 to be fixed. The loading actuator cylinder 1 and the resistance strut 4 are supported by the guide rail support 6 in the middle, and are connected by the loading lug plate 5 and the pin shaft 8 and placed at the guide rail 7 on the guide rail support 6, and the resistance strut 4 is provided with a cyclic load by the reciprocating elongation and shortening of the loading actuator cylinder 1, and the force sensor on the loading actuator cylinder 1 and the displacement sensor on the resistance strut 4 are fed back to monitor the stress and displacement of the resistance strut 4 in real time, and the resistance strut 4 is tested according to the specified test conditions.

[0031] Figure 2 The guide rail control device, the loading lug plate 5 on the loading actuator cylinder 1 and the piston end 101 of the resistance strut 4 are connected as a whole through the pin shaft 8, and the sliding rail fixing lug plate 10 provided with the sliding block 9 is installed to the both ends of the pin shaft 8, and is connected with the guide rail 7, so that the piston end 101 of the resistance strut 4 will not produce lateral and vertical displacement in the test elongation and contraction process, and the structure remains stable.

[0032] Figure 3 The piston end 101 wear test device, the main components of the piston end 101 wear test device include: rotating gear 12, rack 13, adapter flange 14, fixed clamp 15, etc. Figure 3As shown, the pin shaft 8 is matched with the adapter flange 14 through a hex key, the adapter flange 14 is connected with a gear through a bolt, the gear is reinforced using 2 sets of fixed clamps 15, the guide rail support 6 is provided with a rack 13 which can be matched with the gear, when the loading cylinder 1 is elongated or shortened, the pin shaft 8 is driven to slide on the guide rail 7, the gear is driven to rotate, and then the wear performance of the piston end joint bearing 201 of the piston end 101 can be examined while the load is applied.

[0033] Figure 4 The fixed end 102 wear examination system, the fixed end 102 wear examination device mainly includes the following components: a servo electric cylinder 16, a servo electric cylinder support 17, a shaft sleeve 18, and a force transmission fixed rod 19. Figure 4 As shown, the fixed end 102 mounting hole shaft sleeve 18 is connected with the servo electric cylinder 16 through a bolt, the shaft sleeve 18 is directly driven to rotate by the servo electric cylinder 16, the shaft sleeve 18 is rotated relative to the fixed end 102 ear ring hole, and then the wear performance of the fixed end joint bearing 202 at the fixed end 102 can be examined while the load is applied.

[0034] Figure 5 The environmental temperature loading schematic diagram shows that the resistance support rod 4 temperature is directly applied by the high and low temperature environmental box 20, the high and low temperature environmental box 20 adjusts the test temperature through temperature feedback, and the required temperature for the test can be ensured.

[0035] Figure 6 The working temperature loading schematic diagram is used to ensure the temperature required for the normal temperature test, the high temperature test (+100℃), and the low temperature test (-55℃) in the wear resistance and sealing test. The nozzle A and the nozzle B are connected to the hydraulic oil temperature machine 21 through the high and low temperature resistant hydraulic oil pipes respectively, the hydraulic oil temperature machine 21 is provided with a temperature sensor 22, and the working fluid temperature can be maintained at the required temperature for the test.

[0036] Figure 7 The MTS structure test loading system block diagram shows that the system integrates the loading control and monitoring, including the control of the loading cylinder 1, the control of the resistance support rod 4 in and out of the oil, and the real-time data display of the force sensor and the displacement sensor.

[0037] Figure 8 The resistance support rod device schematic diagram shows that the device is divided into the single ear ring piston end 101 and the double ear ring fixed end 102.

[0038] As shown, Figure 1The diagram shows a multi-dimensional life assessment test device for a high-load-bearing resistance strut. The main structure includes a loading actuator 1, an actuator fixing bracket 2, a left reaction force bracket 301, a right reaction force bracket 302, a loading lug 5, a force sensor 23, a displacement sensor 24, a guide rail bracket 6, a guide rail 7, a slider 9, a guide rail fixing lug 10, a pin 8, a piston end spherical bearing 201, a fixed end spherical bearing 202, a rotating gear 12, a rack 13, a transition flange 14, a fixing clamp 15, a servo electric cylinder 16, a servo electric cylinder support 17, a bushing 18, a force transmission fixing rod 19, a high and low temperature environment chamber 20, a hydraulic oil temperature controller 21, and a temperature sensor 22.

[0039] like Figure 1 The cyclic load loading device shown provides a specified cyclic load to the resistance strut 4. A bushing 18 is provided at the fixed end of the double lugs of the resistance strut 4. The bushing is placed outside the pin and the fixed end spherical bearing 202, and is connected and fixed in the lug of the bracket fixing plate 25 on the right reaction support 302. The loading actuator 1 is fixed to the left reaction support 301 by eight φ20 bolts. The left reaction support 301 and the right reaction support 302 are fixed to the ground rail by twelve M24 bolts. The loading actuator 1 is installed on the actuator fixing bracket 2 for fixation. The intermediate support is provided by the guide rail bracket 6. Both are connected to the pin 8 via the loading lug 5 and placed on the guide rail 7 on the guide rail bracket 6. The reciprocating extension and contraction of the loading actuator 1 applies a cyclic load to the resistance strut 4. Feedback is obtained from the force sensor on the loading actuator 1 and the displacement sensor on the resistance strut 4, allowing real-time monitoring of the force and displacement of the resistance strut 4. The strut is then tested under specified conditions.

[0040] like Figure 2 As shown, the guide rail control device provides a supporting carrier for the cyclic loading device and the resistance strut 4, ensuring that the loading direction remains horizontal at all times. The guide rail 7 is installed on the foundation via the guide rail bracket 6, and a slider 9 is installed on top. The slider 9 is connected to the slide rail fixing lug 10 by bolts. The slide rail fixing lug 10 is equipped with lug spherical bearings 203, which are installed on both sides of the pin 8. This structure can effectively constrain the lateral and vertical displacements generated by the test piece during contraction / elongation, ensuring the motion stability of the test piece.

[0041] like Figure 3As shown, the wear test device is used to evaluate the wear resistance of the piston end joint bearing 201 and the fixed end joint bearing 202 of the resistance strut 4 under high load conditions. The piston end 101 wear test device mainly includes rotating gears 12, a rack 13, adapter flanges 14 and fixed clamps 15. Two racks 13 are fixed to the bottom plate of the guide rail bracket 6 by bolts, and when the two side gears are connected with the pin shaft 8, the hexagonal key is first matched with the adapter flange 14, and then the two side adapter flanges 14 are connected with the gears by bolts, and two sets of fixed clamps 15 are used for reinforcement. When the piston end 101 of the resistance strut is stretched and contracted, it will drive the gear to rotate along the rack 13, and the pin shaft 8 and the piston end joint bearing 201 will also rotate, realizing the rotation of the piston end joint bearing 201 relative to the earring hole under high load. According to the design, when the gear diameter is φ1178mm and the piston end 101 is stretched by 642mm, a rotation angle of 62.5° can be achieved, which can meet the requirements of the test regulations, and the structure size can also be adjusted according to different test conditions.

[0042] As shown in Figure 4 , the fixed end 102 wear test device mainly includes a servo cylinder 16, a servo cylinder support 17, a shaft sleeve 18 and a force transmission fixed rod 19. The shaft sleeve 18 at the double ear ring of the resistance strut 4 is connected with the servo cylinder 16 by bolts, and the shaft sleeve 18 is directly driven to rotate by the servo cylinder 16, which can realize the rotation of 27.5° of the mounting hole shaft relative to the bolt shaft, simulate the rotation wear under actual working conditions, and the structure size can also be adjusted according to different test conditions.

[0043] As shown in Figure 5 , Figure 6 , the temperature control system includes an environmental temperature loading device and a working temperature loading device. The environmental temperature loading device provides the required temperature change environment for the test. The resistance strut 4 is wrapped by a high-low temperature environment box 20, and sealed with thermal insulation cotton. The test environment temperature is directly adjusted by the environment box, and the precise control is realized through temperature feedback. The working temperature loading device mainly uses a hydraulic oil temperature machine 21. The A and B pipe nozzles of the resistance strut 4 are connected to the hydraulic oil temperature machine 21 through high and low temperature resistant hydraulic oil pipes. The built-in temperature sensor 22 of the oil temperature machine can stably control the working fluid temperature in the test required range (-55℃ to +100℃).

[0044] As shown in Figure 7 , the MTS structure test loading system integrates loading control and monitoring. It includes the control of the loading actuator 1, the control of the resistance strut 4 oil inlet and outlet, and the real-time data display of the force sensor and displacement sensor 24.

[0045] Firstly, the control of loading cylinder 1 is loaded by high pressure inlet channel P, system return oil channel T and oil port A, B, and the reciprocating movement of loading cylinder 1 can be realized by connecting high pressure inlet channel P and system return oil channel T with oil port A and oil port B respectively. When high pressure inlet channel P is connected with oil port A and system return oil channel T is connected with oil port B, the extension work of loading cylinder 1 can be realized; when channel P is connected with oil port B and channel T is connected with oil port A, the contraction work of loading cylinder 1 can be realized.

[0046] Secondly, the control of resistance support rod 4 is in and out of oil, because resistance support rod 4 only has a single cavity when the oil inlet and outlet holes are in the actual process, so resistance support rod 4 can only enter oil, and then discharge through the oil outlet. Resistance support rod 4 piston end 101 is divided into two kinds of tension and pressure test methods.

[0047] Among them, the operation mode of pressure test is that high pressure inlet channel P is connected with oil port A, system return oil channel T is connected with oil port B, the extension of loading cylinder 1 is realized, at the same time, oil is fed into resistance support rod 4, so that loading cylinder 1 and resistance support rod 4 resist each other, and real-time monitoring of force and displacement sensor is realized to meet the test condition requirements.

[0048] Among them, the operation mode of tension test is that high pressure inlet channel P is connected with oil port B, system return oil channel T is connected with oil port A, the contraction of loading cylinder 1 is realized, at the same time, the oil inlet of resistance support rod 4 is sealed to make the cavity in a vacuum state, loading cylinder 1 is contracted to the innermost end, the oil pressure of loading cylinder 1 is slowly reduced, at the same time, the proportional pressure reducing valve 11 of resistance support rod 4 is connected to adjust the abdominal pressure in real time, the piston end 101 is contracted at the same time under the tension test through the vacuum abdominal pressure of resistance support rod 4, and real-time monitoring of force and displacement sensor is realized to meet the test condition requirements.

[0049] The left counterforce support 301, the right counterforce support 302, the loading actuator fixed support, the loading ear plate 5, the guide rail support 6, the sliding rail fixed ear plate 10, the rotating gear 12, the adapter flange 14, the fixed clamp 15, the servo cylinder support 17, the force transmission fixed rod 19, the high and low temperature environment box 20 and the like of the present application are specially designed, processed and assembled; the loading actuator cylinder 1, the force sensor, the displacement sensor, the servo cylinder 16, the temperature sensor 22 and the like are market purchased; all standard parts and raw materials are directly purchased from the market.

[0050] The application can carry out cyclic loading test on the resistance strut under different temperature conditions, comprehensively examines the wear resistance, sealing performance and working reliability of the resistance strut, can simulate the cyclic loading, rotary wear and temperature change environment under the actual working condition, realizes the examination of the resistance strut under the elongation and contraction working state through the MTS structure test loading system, solves the problem that the resistance strut cannot be examined under the tension state when the resistance strut piston end is contracted due to the limitation of the single cavity oil port of the resistance strut, and solves the problem that the traditional test method is difficult to reproduce the multi-physical field coupling effect. The test data can provide effective support for the structure optimization, life prediction and reliability evaluation of the high load resistance strut, and is suitable for the comprehensive performance examination of various types of aircraft landing gear resistance strut devices.

[0051] The above only describes the preferred embodiments of the application, and it should be pointed out that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A high bearing resistance strut multi-dimension life evaluation test device, characterized in that, It comprises a cyclic load loading device, a guide rail control device, a wear evaluation device, a temperature control system and an MTS structure test loading system. The cyclic load loading device comprises a loading actuator (1), an actuator fixing support (2), a left counter-force support (301), a loading lug plate (5), a force sensor (23) and a displacement sensor (24). The two ends of the loading actuator (1) are fixedly installed with the left counter-force support (301) and the actuator fixing support (2) respectively. The movable end of the loading actuator is fixed with the loading lug plate (5). The loading lug plate (5) is connected with the piston end (101) of the resistance support rod as a whole and is placed in the sliding block (9) on the guide rail (7). The force sensor (23) is installed on the movable end of the loading actuator (1). The fixed end (102) of the resistance support rod is fixed with the support lug plate (25) on the right counter-force support (302). The displacement sensor is installed on the resistance support rod (4). The guide rail control device comprises a guide rail support (6), a guide rail (7), a pin shaft (8), a sliding block (9), a sliding rail fixing lug plate (10) and a lug joint bearing (203). The sliding block is placed on the guide rail (7). The upper part of the sliding rail fixing lug plate (10) is provided with the lug joint bearing (203) for the rotation of the pin shaft (8). The wear evaluation device comprises a piston end wear evaluation device and a fixed end wear evaluation device. The piston end (101) wear evaluation device comprises a rotating gear (12), a rack (13), an adapter flange (14) and a fixed clamp (15). The pin shaft (8) penetrates through the resistance support rod piston end (101), the loading lug plate (5), the sliding rail fixing lug plate (10), the adapter flange (14) and the rotating gear (12). The pin shaft (8) is matched with the adapter flange (14) through a hexagonal key. The adapter flange (14) is connected with the rotating gear through bolts. The rotating gear is reinforced by using two sets of fixed clamps (15). The fixed end (102) wear evaluation device comprises a servo cylinder (16), a servo cylinder support (17), a shaft sleeve (18) and a force transmission fixed rod (19). The fixed end (102) mounting hole shaft sleeve (18) is connected with the servo cylinder (16) through bolts. The shaft sleeve (18) is directly driven to rotate by the servo cylinder (16), so that the shaft sleeve (18) rotates relative to the ear ring hole of the fixed end (102), thereby realizing the evaluation of the fixed end joint bearing (202). The temperature control system comprises a high-low temperature environment box (20) and a hydraulic oil temperature machine (21). The temperature sensor (22) is installed on the hydraulic oil temperature machine (21).

2. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The two oil ports of the resistance support rod (4) are connected to the hydraulic oil temperature machine (21) through hydraulic oil pipes. The temperature sensor (22) is installed on the hydraulic oil temperature machine (21).

3. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The temperature control system comprises an ambient temperature loading device and a working temperature loading device. The ambient temperature loading device wraps the resistance strut (4) by a high-low temperature environment box (20) and seals it with thermal insulation cotton. The test ambient temperature is directly adjusted by the high-low temperature environment box and is precisely controlled through temperature feedback. The working temperature loading device uses a hydraulic oil temperature machine (21). The nozzles A and B on the pipe body of the resistance strut (4) are connected to the hydraulic oil temperature machine (21) through high-low temperature resistant hydraulic oil pipes. The hydraulic oil temperature machine is provided with a temperature sensor (22) to stabilize the working fluid temperature in the range of-55℃ to +100℃.

4. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The MTS structure test loading system controls the loading actuator cylinder (1) in the following steps: the hydraulic source is connected to the loading actuator cylinder through a servo valve, and the MTS loading system controls the servo valve. The servo valve comprises a high-pressure oil inlet channel P, a system oil return channel T and oil ports A and B. The reciprocating movement of the loading actuator cylinder (1) is realized through the connection of the high-pressure oil inlet channel P and the system oil return channel T with the oil ports A and B. When the high-pressure oil inlet channel P is connected to the oil port A and the system oil return channel T is connected to the oil port B, the extension work of the loading actuator cylinder (1) is realized. When the high-pressure oil inlet channel P is connected to the oil port B and the system oil return channel T is connected to the oil port A, the contraction work of the loading actuator cylinder (1) is realized.

5. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The MTS structure test loading system controls the resistance strut (4) to enter and exit oil in the following steps: the resistance strut (4) is provided with a single cavity structure, an oil inlet hole (nozzle A) and an oil outlet hole (nozzle B). The resistance strut (4) enters oil through the oil inlet hole and discharges the oil through the oil outlet hole. The hydraulic source is connected to the resistance strut through a proportional pressure reducing valve, and the MTS loading system controls the proportional pressure reducing valve.

6. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein Two guide rails (7) arranged in parallel are respectively mounted on the top surface of the guide rail support; the sliding block (9) is screwed with the sliding rail fixed lug plate (10), and the guide rail support (6) is fixedly connected with the floor through bolts.

Images