A load oblique follow-up loading device

Abstract

The present application provides a load oblique follow-up loading device, which includes: a follow-up control device for adjusting the position and angle of the loading load; a hydraulic actuator connected to the follow-up control device for realizing tensile loading or compression loading of the load; the present application provides a load oblique follow-up loading device, which test device can load according to the requirements of a real continuous load spectrum, thereby improving the credibility of the test results; the loading load uses direct loading to avoid errors caused by indirect loading that is decomposed into horizontal and vertical loads, thereby improving the loading accuracy.

Description

Technical Field

[0001] The present application belongs to the technical field of aviation structure strength testing, and in particular relates to an oblique load follow-up loading device. Background Art

[0002] Fatigue test of aircraft components and the whole aircraft structure is one of the full-scale verification tests, the purpose of which is to verify whether the structure meets the service life requirements specified in the system specifications. Aircraft design has many active mechanisms, such as landing gear, doors, flaps, etc. The external loads borne by such active mechanisms change with the change of the activity angle during flight and ground operation (such as Figure 1 The loads in the ground fatigue test are shown in Figure 2), which include changes in load size and load direction. Therefore, these changing loads need to be accurately simulated in the ground fatigue test.

[0003] At present, there are two conventional test methods. One is to divide the continuous load spectrum into multiple discontinuous spectrum blocks according to the loading position, and then load according to the spectrum blocks. This method causes loading distortion; the other is to decompose the oblique load into horizontal and vertical directions, and use two devices to load respectively. The combined force and direction of the two loading devices are the actual load. This method is an indirect loading method, and two sets of position control devices are required to control the position changes in the two directions respectively. Therefore, the current loading device has the disadvantages of low precision, low efficiency and high investment cost. Summary of the invention

[0004] In view of the above technical problems, the present application provides a load oblique follow-up loading device, the loading device comprising:

[0005] A follow-up control device is used to adjust the position and angle of the applied load;

[0006] The hydraulic cylinder is connected to the follow-up control device and is used to achieve tensile loading or compressive loading of the load.

[0007] Preferably, the follow-up control device comprises:

[0008] Loading device base;

[0009] A slide rail component, arranged on the loading device base;

[0010] Wherein, the hydraulic cylinder is arranged on the slide rail component through a hydraulic cylinder mounting base.

[0011] Preferably, the follow-up control device further includes:

[0012] An electric actuator base is arranged on the loading device base;

[0013] An electric actuator cylinder, one end of which is connected to the electric actuator cylinder base, and the other end of which is connected to the hydraulic actuator cylinder mounting base.

[0014] Preferably, the slide rail component comprises:

[0015] A slide rail mounting plate, arranged on the loading device base;

[0016] A linear guide rail, arranged on the slide rail mounting plate;

[0017] A linear bearing slider is arranged on the linear guide rail, and the linear bearing slider can slide along the linear guide rail.

[0018] Preferably, the slide rail component further includes:

[0019] A position locking fixing plate having a locking hole; the position locking fixing plate is arranged on the slide rail mounting plate; wherein the position of the locking hole is determined based on the loading displacement and angle.

[0020] Preferably, the hydraulic cylinder mounting base is arranged on the linear bearing slider.

[0021] Preferably, the hydraulic cylinder is connected to one side of the hydraulic cylinder mounting base via a ball joint; the hydraulic cylinder can rotate around the ball joint.

[0022] Preferably, a locking mechanism is provided on one side of the hydraulic cylinder mounting base.

[0023] Beneficial technical effects of this application:

[0024] The present application provides a load oblique follow-up loading device, which can load according to the requirements of a real continuous load spectrum, thereby improving the credibility of the test results; the loading load uses direct loading to avoid errors caused by indirect loading that is decomposed into horizontal and vertical loads, thereby improving the loading accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of an oblique follower loading provided in an embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of a load oblique follow-up loading device provided in an embodiment of the present application;

[0027] Figure 3 is a structural schematic diagram of a follow-up control device provided in an embodiment of the present application;

[0028] Figure 4 is a structural schematic diagram of a slide rail component provided in an embodiment of the present application;

[0029] Figure 5 is a structural schematic diagram of a locking mechanism provided in an embodiment of the present application;

[0030] Among them, 1-loading device base; 2-slide rail mounting plate; 3-linear guide rail; 4-linear bearing slider; 5-electric actuator cylinder base; 6-electric actuator cylinder; 7-hydraulic actuator cylinder mounting base; 8-position locking fixing plate; 9-locking push rod transition plate; 10-hydraulic locking push rod; 11-locking pin; 12-follow-up control device; 13-hydraulic actuator cylinder. DETAILED DESCRIPTION

[0031] It should be noted that the present application relates to an aviation structure strength test loading device, which is used for dynamic large load oblique loading with a loading point of variable angle and position during fatigue testing.

[0032] The purpose of this application is to change the shortcomings of low precision, low efficiency, and high investment in existing test loading methods, improve the test method of oblique follow-up loading in fatigue testing, and realize fatigue loading with large loads.

[0033] See also Figure 1-5 The large-load oblique follow-up loading device includes a follow-up control device 12 and a hydraulic cylinder 13. The main function of the hydraulic cylinder 13 is to perform large-load tensile or compressive loading, and the follow-up control device 12 is to realize the function of loading the load position and angle.

[0034] In the embodiment of the present application, the slide rail component is composed of a slide rail mounting plate 2, a linear guide rail 3, a linear bearing slider 4 and a position locking fixing plate 8.

[0035] Among them, the linear guide rail 3 is vertically mounted on the slide rail mounting plate 2, and the linear bearing slider 4 matched with the linear guide rail 3 is installed and used in combination, and the linear bearing slider 4 can slide along the linear guide rail 3. A position locking fixing plate 8 is installed on the slide rail mounting plate 2, and a locking hole is set on the position locking fixing plate 8. During the test, the hole position is determined according to multiple displacements and angles of actual loading.

[0036] Among them, two sets of parallel slide rail components are installed on the loading device mounting base 1 to form the final loading fixed part. The hydraulic cylinder mounting base 7 is connected to the linear bearing slider 4 through four mountings, and the hydraulic cylinder is installed on the hydraulic cylinder mounting base 7, so that the hydraulic cylinder can slide up and down in the vertical direction. At the same time, the root of the hydraulic cylinder is a ball joint, and the hydraulic cylinder can rotate around the ball joint.

[0037] The electric actuator base 5 is mounted on the loading device base 1, the lower end of the electric actuator 6 is mounted on the electric actuator base 5, and the upper end is mounted on the hydraulic actuator mounting base 7. The electric actuator 6 is controlled to extend and retract by the control system, thereby pushing the hydraulic actuator mounting base 7 to slide up and down with the hydraulic actuator, and stops after reaching the specified position.

[0038] In a feasible implementation, a locking push rod transition plate 9 is installed on the back of the hydraulic cylinder mounting base 7, the base of the hydraulic locking push rod 10 is installed on the locking push rod transition plate 9, the hydraulic locking push rod 10 is connected to a locking pin 11, and the hydraulic locking push rod 10 is controlled to extend and retract by a control system, thereby pushing the locking pin 11 to insert or pull out of the hole of the position locking fixing plate 8.

[0039] The test device provided by the present application can be loaded according to the requirements of a real continuous load spectrum, thereby improving the credibility of the test results; direct loading is used for loading the load, thereby avoiding errors caused by indirect loading that is decomposed into horizontal and vertical loads, thereby improving loading accuracy; the test loading position is controlled by a program through an electric actuator cylinder, thereby improving the accuracy of the load loading position and angle; the obliquely decomposed vertical load is carried by a locking pin, thereby avoiding the electric actuator cylinder from being overloaded during the test, and therefore a small load electric actuator cylinder can be selected to reduce the cost of the test investment; compared with existing conventional methods, it has the advantage of a high loading frequency.

[0040] The device provided in the present application can be used in fatigue tests of movable parts such as aircraft landing gear, doors, flaps, etc., to achieve multi-position and multi-angle follow-up direct loading of large loads in fatigue tests, increase the test loading frequency, and improve the cycle of the entire test.

[0041] In other embodiments of the present application, the present application proposes an aviation structure strength test loading device, which is used for dynamic large-load oblique loading with variable position and angle of loading point during fatigue testing.

[0042] When implementing the specific test, Figure 1 Schematic diagram (N loading positions and angles can be set in actual tests):

[0043] Step 1: The test piece is located at L 1 and L 2 According to the test loading requirements (position, angle), the theoretical calculation results show that the position of the installation base of the hydraulic actuator is O 1 and O 2 .

[0044] Step 2: The test piece is located at L 1 When the control system commands the electric actuator 6 to start, the displacement sensor inside the electric actuator 6 measures the dynamic position, and the electric actuator 6 pushes the hydraulic actuator mounting base 7 along the linear guide rail 3 to reach position L1 After that, the electric actuator 6 stops moving.

[0045] Step 3: The control system commands the hydraulic locking push rod 10 to start, and the hydraulic locking push rod 10 pushes the locking pin 11 to insert into the corresponding hole of the position locking fixing plate 8 to reach a locking state.

[0046] Step 4: The control system commands the electric actuator 6 to slightly move downward to remove the load it bears, and the hydraulic actuator starts to load the large load. At this time, the vertical and horizontal constraint loads generated by the large load loading are borne by the linear bearing slider 4 and the locking pin 11, and finally transmitted to the loading device base 1.

[0047] Step 5: Until the test piece is at position L 1 When loading is complete, proceed to the next position L 2 load;

[0048] Step 6: The control system commands the electric actuator 6 to move slightly upward to bear the weight load of the base, etc., and the hydraulic locking push rod 10 is started. The hydraulic locking push rod 10 pulls the locking pin 11 out of the corresponding hole of the position locking fixing plate 8 to reach the unlocking state.

[0049] Step 7: The control system commands the electric actuator 6 to push the hydraulic actuator mounting base 7 along the linear guide rail 3 to reach position L 2 , execute L 2 The loader for the location.

[0050] Step 8: Complete the procedure for all loading location points.

Claims

1. A load oblique follow-up loading device, characterized in that: The loading device comprises: A follow-up control device is used to adjust the position and angle of the applied load; A hydraulic cylinder connected to the follow-up control device for realizing tensile loading or compressive loading of the load; The follow-up control device comprises: Loading device base; A slide rail component, arranged on the loading device base; An electric actuator base is arranged on the loading device base; An electric actuator cylinder, one end of which is connected to the electric actuator cylinder base, and the other end of which is connected to the hydraulic actuator cylinder mounting base; Among them, the control system commands the electric actuator cylinder to start, and the displacement sensor inside the electric actuator cylinder measures the dynamic position. After the electric actuator cylinder pushes the hydraulic actuator cylinder mounting base along the linear guide rail to reach position L1, the electric actuator cylinder stops moving; Wherein, the hydraulic cylinder is arranged on the slide rail component through the hydraulic cylinder mounting base; a locking push rod transition plate is installed on the back of the hydraulic cylinder mounting base, the hydraulic locking push rod base is installed on the locking push rod transition plate, the hydraulic locking push rod is connected with a locking pin, and the hydraulic locking push rod is controlled to extend and retract by the control system, thereby pushing the locking pin to be inserted into or pulled out of the locking hole of the position locking fixing plate; the position locking fixing plate is arranged on the slide rail mounting plate; wherein, the position of the locking hole is determined based on the loading displacement and angle; The slide rail component comprises: A slide rail mounting plate, arranged on the loading device base; A linear guide rail, arranged on the slide rail mounting plate; A linear bearing slider is arranged on the linear guide rail, and the linear bearing slider can slide along the linear guide rail.

2. The load oblique follow-up loading device according to claim 1, characterized in that: The hydraulic cylinder mounting base is arranged on the linear bearing slider.

3. The load oblique follow-up loading device according to claim 2, characterized in that: The hydraulic cylinder is connected to one side of the hydraulic cylinder mounting base via a ball joint; the hydraulic cylinder can rotate around the ball joint.

4. The load oblique follow-up loading device according to claim 3, characterized in that: A locking mechanism is arranged on one side of the hydraulic cylinder mounting base.

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