A large impact acceleration loading test device and test method

Abstract

The application provides a large impact acceleration loading test device, which comprises a frame, upper support rods and support columns hingedly connected to the frame, the upper support rods and the support columns being hingedly connected through lower support rods, upper locking support rods and lower locking support rods being hingedly connected to each other, two ends of the upper locking support rods and the lower locking support rods being hingedly connected to hinge points of the upper support rods and the lower support rods and upper ends of the support columns, springs connecting the upper locking support rods and the support columns, and an actuating cylinder having one end hingedly connected to the frame and the other end hingedly connected to the lower locking support rods, the frame, the upper support rods, the lower support rods and the support columns forming a first four-bar linkage mechanism, the upper locking support rods, the lower locking support rods, the lower support rods and the support columns forming a second four-bar linkage mechanism, and the lower locking support rods being controlled to rotate through the actuating cylinder, so that different overload areas are formed on the first four-bar linkage mechanism and the second four-bar linkage mechanism. The test device utilizes the mutual coupling of the two four-bar linkage mechanisms and the spring force, so that the test device can be improved to a large impact acceleration, and the test device occupies a small space.

Description

Technical Field

[0001] This application belongs to the field of landing gear testing technology, and specifically relates to a large impact acceleration loading test device and test method. Background Technology

[0002] Because landing gear needs to withstand significant impact loads during aircraft landing, it is necessary to conduct impact load tests on the landing gear.

[0003] In the existing technology, due to the large size of the landing gear structure, the equipment for impact load testing of the landing gear usually occupies a large area but can only output a small impact load, which is not conducive to impact load testing of the landing gear.

[0004] Therefore, a testing device or equipment with a small footprint and a large extended impact load is needed. Summary of the Invention

[0005] The purpose of this application is to provide a large impact acceleration loading test device and test method to solve or alleviate at least one of the problems in the background art.

[0006] On one hand, this application provides a large impact acceleration loading test device, the test device comprising:

[0007] frame;

[0008] The upper support rod and the column are respectively hinged to the frame, and the upper support rod and the column are hinged together by the lower support rod;

[0009] The upper and lower locking struts are hinged to each other, and the two ends of the upper and lower locking struts are respectively hinged to the hinge point of the upper strut and the lower strut and the upper end of the support column;

[0010] The spring connecting the locking strut and the support column; and

[0011] An actuator cylinder that is hinged at one end to the frame and at the other end to the lower locking strut;

[0012] The frame, upper support rod, lower support rod, and column constitute the first four-bar linkage mechanism, and the upper locking support rod, lower locking support rod, lower support rod, and column constitute the second four-bar linkage mechanism. The lower locking support rod is rotated by the actuator, thereby forming different overload areas in the first and second four-bar linkage mechanisms.

[0013] Furthermore, a stop bolt is provided at the hinge position of the upper locking support rod and the lower locking support rod, and the stop bolt is used to stop the movement during the hinge closing process of the upper locking support rod and the lower locking support rod.

[0014] Furthermore, the number of springs is one or more.

[0015] On the other hand, this application provides a method for testing large impact acceleration loading, employing any of the large impact acceleration loading testing devices described above, the testing method comprising:

[0016] Determine the overload range of the equipment under test;

[0017] According to the overload range of the device under test, fix the device under test to an upper support rod, lower support rod, column, upper locking support rod or lower locking support rod that is close to the overload range;

[0018] The control actuator retracts to lift the support column;

[0019] Releasing the actuator causes the upper support rod, lower support rod, or column in the first four-bar linkage to experience the first impact. Simultaneously, the upper and lower locking support rods, after approaching their deflection, rapidly fold under the action of the spring and collide in the area of ​​the stop bolt end, thereby creating the required larger impact overload in the second four-bar linkage.

[0020] Furthermore, the overload range that the upper support rod, lower support rod, column, upper locking support rod, or lower locking support rod can provide is obtained by measuring the overload sensor at different locations before the test.

[0021] Furthermore, during the actual testing process, an overload sensor is fixed near the device under test to calibrate and verify the impact overload value experienced by the device under test during the test.

[0022] Furthermore, adjusting the impact overload generated during the test includes:

[0023] 1) Increase or decrease the number of springs;

[0024] 2) Adjust the end thickness or material of the stop bolt;

[0025] 3) Adjust the deflection of the upper support rod, lower support rod, upper locking support rod, lower locking support rod, or support column;

[0026] 4) Adjust the lengths of the upper support rod, lower support rod, upper locking support rod, and lower locking support rod;

[0027] 5) Adjust the release pressure speed of the actuator cylinder;

[0028] 6) Adjust the release pressure of the actuator cylinder;

[0029] 7) Adjust the retraction angle and height of the actuator to pull up the lower locking support rod.

[0030] The large impact load loading test device and test method provided in this application utilize the mutual coupling of two four-bar linkages, combined with spring force, and the collision stop between the locking struts to increase the test equipment to a very large impact acceleration (above 500g). The loading device has a relatively small space, and the loading is flexible and adjustable. Attached Figure Description

[0031] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0032] Fig. 1 This is a schematic diagram of the overall large impact acceleration overload test device of this application.

[0033] Fig. 2 This is a detailed schematic diagram of the high-impact acceleration overload test device of this application.

[0034] Fig. 3 This is a partial enlarged view of the upper and lower locking struts of this application.

[0035] Fig. 4 This is a schematic diagram of the large impact acceleration overload test device of this application in its fully retracted state.

[0036] Fig. 5 This is a schematic diagram of the release process of the large impact acceleration overload test device of this application.

[0037] Fig. 6 This is a schematic diagram showing the state after the release of the large impact acceleration overload test device of this application. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0039] like Figs. 1 to 3 As shown, the large impact acceleration load testing device provided in this application includes: a frame 1, an upper support rod 2, a support column 3, a lower support rod 4, an upper locking support rod 5, a lower locking support rod 6, a spring 7, and an actuator cylinder 8.

[0040] Frame 1 constitutes the support structure of the testing device. It is roughly square and fixed to the bottom surface. In this application, frame 1 is composed of vertical and horizontal rectangular tube structures, with its upper part forming a plane.

[0041] The upper support rod 2, the lower support rod 4, the pillar 3, and the upper locking support rod 5 and the lower locking support rod 6 are all rod-shaped structures with lugs at both ends.

[0042] The upper end of the upper support rod 2 is hinged to the upper plane of the frame 1 through an ear plate structure, and the upper end of the support column 3 is also hinged to the upper plane of the frame 1 through an ear plate structure. The two hinge points are spaced apart.

[0043] The support column 3 has a double-ear structure at approximately the middle position. The two ends of the lower support rod 4 are respectively hinged to the lower end of the upper support rod 2 and the double-ear structure at the middle position of the support column 3, thus forming hinge point A and hinge point B.

[0044] The upper locking strut 5 and the lower locking strut 6 are hinged to form a hinge point C, and a stop bolt 51 is provided at hinge point C. The stop bolt 51 can lock the upper locking strut 5 and the lower locking strut 6 to form a non-bending rod. The other ends of the upper locking strut 5 and the lower locking strut 6 are respectively hinged to the hinge point A of the upper strut 2 and the lower strut 4 and the upper end of the support column 3, thereby forming a hinge point D at the upper end of the support column 3.

[0045] At least one spring 7 connects the locking strut 5 and the support column 3, with the connection points being approximately the middle position F of the locking strut 5 and the position E between the hinge point B of the support column 3 and the lower strut 4 and the upper hinge point D of the support column 3.

[0046] One end of the actuator cylinder 8 is connected to the upper plane of the frame 1, and the other end is connected to the lower locking support rod 6.

[0047] like Figs. 4 to 6 As shown, the usage process of the large impact acceleration load testing device of this application is as follows:

[0048] 1) First, determine the required overload range of the device under test and fix the test device in the required test position.

[0049] The large impact acceleration load testing device of this application can provide an overload of nearly 1000g in the area of ​​the upper locking strut 5, an overload of approximately 500g in the area of ​​the lower locking strut 6, an overload of approximately 10g in the area of ​​the support column 3 and the upper strut 2, and an overload of approximately 50g in the area of ​​the lower strut 4.

[0050] For example, device 91 requires an overload impact test of approximately 50g, therefore it is fixedly mounted on the lower support rod 4. As another example, device 92 requires an impact overload of approximately 500g, therefore it is fixedly mounted on the lower locking support rod 6. Other examples are omitted.

[0051] It should be noted that before testing, the large impact acceleration load testing device provided in this application can first measure the impact overload at different locations using overload sensors to form an expected value. The initial value can be adjusted in different ways as needed to obtain the required overload value. During the actual testing process, overload sensors can also be fixed near the device under test to verify the detailed information of the large impact overload value experienced by the device under test at that time.

[0052] 2) During the test, by controlling the shortening of the actuator 8, the lower locking strut 6 is rotated clockwise. During the rotation, the strut 3 and its struts are moved and held in the desired position.

[0053] The control actuator 8 is pressurized and lowered at the required speed (or pressure is not supplied and oil returns to both ends). During the lowering process, the upper support rod 2 and the lower support rod 4 will straighten to form the first impact. After the upper locking support rod 5 and the lower locking support rod 6 approach their deflection, they will fold extremely quickly under the action of spring force and collide with the end area of ​​the stop bolt 51. During the short-term collision, the required large impact overload can be formed.

[0054] The large impact acceleration load testing device provided in this application has various adjustable modes, including:

[0055] 1) Increasing or decreasing spring 7 can change the overload;

[0056] 2) By varying the end thickness or material of the stop bolt 51, the overload can be varied;

[0057] 3) By varying the deflection of each strut or support, the overload can be varied;

[0058] 4) By adjusting the length of each support rod, different overload conditions can be achieved;

[0059] 5) After the actuator cylinder is lifted, the pressure supply speed can be varied under overload conditions.

[0060] 6) Adjusting the pressure of the actuator cylinder can change the overload.

[0061] 7) Changes in the loading position (retraction angle and height) can change the overload.

[0062] 9) Large impact overloads can be generated by gravity without the need for a brake;

[0063] 10) Different weight blocks can be added to the end of the support column 3 to form different impact overloads.

[0064] The large impact acceleration load testing device provided in this application can generate large impact overloads of various magnitudes, ranging from tens of grams to nearly a thousand grams, with a wide detection range.

[0065] The large impact load testing device provided in this application utilizes the mutual coupling of two four-bar linkages, combined with spring force, and uses the collision stop between the locking struts to increase the testing equipment to a very large impact acceleration (above 500g). This loading device has a relatively small space, and the loading is flexible and adjustable.

[0066] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A large impact acceleration loading test device, characterized in that, The testing apparatus includes: frame; The upper support rod and the column are respectively hinged to the frame, and the upper support rod and the column are hinged together by the lower support rod; The upper and lower locking struts are hinged to each other, and the two ends of the upper and lower locking struts are respectively hinged to the hinge point of the upper strut and the lower strut and the upper end of the support column; The spring connecting the locking strut and the support column; and An actuator cylinder that is hinged at one end to the frame and at the other end to the lower locking strut; The frame, upper support rod, lower support rod, and column constitute the first four-bar linkage mechanism, and the upper locking support rod, lower locking support rod, lower support rod, and column constitute the second four-bar linkage mechanism. The lower locking support rod is rotated by the actuator, thereby forming different overload areas in the first and second four-bar linkage mechanisms. Determine the overload range of the device under test, and fix the device under test to an upper support rod, lower support rod, column, upper locking support rod, or lower locking support rod that is close to the overload range.

2. The large impact acceleration loading test device as described in claim 1, characterized in that, The hinge joint of the upper and lower locking struts is provided with a stop bolt, which stops the movement during the hinged closure process of the upper and lower locking struts.

3. The large impact acceleration loading test device as described in claim 1, characterized in that, The number of springs is one or more.

4. A method for testing large impact acceleration loading, characterized in that, The test method, employing the large impact acceleration loading test apparatus as described in any one of claims 1 to 3, includes: Determine the overload range of the equipment under test; According to the overload range of the device under test, fix the device under test to an upper support rod, lower support rod, column, upper locking support rod or lower locking support rod that is close to the overload range; The control actuator retracts to lift the support column; Releasing the actuator causes the upper support rod, lower support rod, or column in the first four-bar linkage to experience the first impact. Simultaneously, the upper and lower locking support rods, after approaching their deflection, rapidly fold under the action of the spring and collide in the area of ​​the stop bolt end, thereby creating the required larger impact overload in the second four-bar linkage.

5. The large impact acceleration loading test method as described in claim 4, characterized in that, The overload range that the upper support rod, lower support rod, column, upper locking support rod, or lower locking support rod can provide is obtained by measuring the overload sensor at different locations before the test.

6. The large impact acceleration loading test method as described in claim 4, characterized in that, In actual testing, an overload sensor is fixed near the device under test to calibrate and verify the impact overload value experienced by the device under test during the test.

7. The large impact acceleration loading test method as described in claim 4, characterized in that, Adjusting the impact overload generated during the test includes: 1) Increase or decrease the number of springs; 2) Adjust the end thickness or material of the stop bolt; 3) Adjust the deflection of the upper support rod, lower support rod, upper locking support rod, lower locking support rod, or support column; 4) Adjust the lengths of the upper support rod, lower support rod, upper locking support rod, and lower locking support rod; 5) Adjust the release pressure speed of the actuator cylinder; 6) Adjust the release pressure of the actuator cylinder; 7) Adjust the retraction angle and height of the actuator to pull up the lower locking support rod.

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