A herringbone sliding rail strength and rigidity test test fixture and test method

Abstract

The application belongs to the field of aircraft structure strength test, and particularly relates to a kind of herringbone slide rail strength and rigidity test test fixture and test method, wherein the device includes: support fixture, slide rail test piece, loading fixture, actuator structure and the like. Wherein in the loading fixture, relevant joint bearings are arranged, which can balance the small torque generated in the actual loading process. Wherein a tangential slider is installed on the slide rail, which ensures that the loading fixture does not produce tangential sliding relative to the slide rail during the test process. Wherein four displacement sensor displacement measurement points are defined on the slide rail to measure the displacement of the side beam slide rail, to represent the rigidity of the slide rail. Wherein strain gauge measurement points and strain gauge types are defined on the slide rail to measure the stress value of the slide rail, to represent the strength of the slide rail. The application can ensure the accuracy of load loading and the stability of the loading structure during the loading process in the strength and rigidity test of the herringbone slide rail, and accurately determine the strength and rigidity characteristics of the herringbone slide rail.

Description

Technical Field

[0001] This application belongs to the field of aircraft structural strength testing, and specifically relates to a test fixture and test method for testing the strength and stiffness of a herringbone slide rail. Background Technology

[0002] Many flaps use slide rails to drive their position. The herringbone slide rail is unique, containing upper and lower roller track grooves. The rollers on the pulley frame roll within these grooves to achieve various positions. To assess the strength and stiffness of the herringbone slide rail, it's necessary to simulate the load transmitted from the actual rollers to the rail. Therefore, a dedicated test fixture needs to be designed for the herringbone slide rail. Summary of the Invention

[0003] To address the aforementioned problems, a test apparatus for testing the strength and stiffness of a herringbone-shaped slide rail is provided, used to apply loads to the slide rail test piece; the slide rail test piece includes two herringbone-shaped upper and lower tracks; the test fixture includes:

[0004] Supports clamps, upper roller point loading clamps, lower roller point loading clamps, upper roller point load loading actuators, and lower roller point load loading actuators, wherein:

[0005] The slide rail test piece and the support fixture are connected by bolts through two bolt connection holes on the slide rail test piece;

[0006] The upper rail surface of the slide rail test piece contacts the upper roller point loading fixture through the spherical bearing rollers provided in the upper roller point loading fixture;

[0007] The lower rail surface of the slide rail test piece contacts the lower roller point loading fixture through the spherical bearing rollers provided in the lower roller point loading fixture;

[0008] The upper roller point loading fixture and the upper roller point load loading actuator are connected by single and double lugs and bolts;

[0009] The lower roller point loading fixture and the lower roller point load loading actuator are connected by single and double lugs and bolts.

[0010] Preferably, the spherical bearing roller includes: two cantilever shafts disposed on the inner sides of the loading ears of the upper roller point loading fixture and the lower roller point loading fixture, wherein the rollers are mounted on the cantilever shafts via spherical bearings; and the roller sealing edges are installed in the track grooves on both sides of the slide rail test piece.

[0011] Preferably, it further includes: an upper roller point tangential stop block, the upper roller point tangential stop block being connected to the slide rail test piece by two bolts, and the contact surface between the upper roller point tangential stop block and the spherical bearing roller in the roller point loading fixture being parallel to the load direction of the upper roller point load loading actuator cylinder.

[0012] Preferably, it also includes: a tangential stop block at the lower roller point is fixed on the test base frame by a straight arm, the plane of the tangential stop block at the lower roller point contacting the lower roller point loading fixture is parallel to the load direction of the lower roller point load loading actuator, the stop block restricts the roller sliding, and the parallelism between the stop block and the load direction is to avoid the stop block generating a component force in the loading direction, thus avoiding affecting the load loading.

[0013] Preferably, the upper roller point load loading actuator and the lower roller point load loading actuator apply a test load tension.

[0014] Preferably, the spherical bearing rollers provided in the upper roller point loading fixture and the lower roller point loading fixture respectively include: a left spherical bearing roller and a right spherical bearing roller, and the left spherical bearing roller and the right spherical bearing roller are respectively disposed in the track.

[0015] A loading method for testing the strength and stiffness of a herringbone slide rail, employing the aforementioned herringbone slide rail strength and stiffness testing apparatus.

[0016] Multiple strain gauges are attached to the axes of the upper and lower tracks of the slide rail test piece; the support fixture, the upper roller point loading fixture, and the lower roller point loading fixture are connected to the slide rail test piece.

[0017] The slide rail test piece was preloaded with a preload of 40% of the design load. The load was gradually increased in increments of 5% of the design load, and then gradually unloaded to zero. The strain gauges and displacement measurement points were then inspected.

[0018] The slide rail test piece was subjected to a limited load. Between 0% and 65% of the design load, the load was applied in increments of 5% of the design load. Between 65% and 67% of the design load, the load was applied in increments of 2% of the design load. When the load reached 67% of the design load, it was held for 30 seconds. The load was then gradually unloaded to zero. During the test, the strain and displacement were measured at each step.

[0019] The slide rail test specimen was subjected to design load loading and failure test. Between 0% and 65% of the design load, the load was increased in increments of 5% of the design load; between 65% and 67% of the design load, the load was increased in increments of 2% of the design load; between 67% and 70% of the design load, the load was increased in increments of 3% of the design load; after 70% of the design load, the load was increased in increments of 2% of the design load; when the design load was reached, it was held for 3 seconds; if the test specimen did not fail, the load was increased in increments of 2% of the design load until failure; if the test specimen still did not fail when the load was reached, the test was stopped.

[0020] The present invention can ensure the accuracy of load loading and the stability of the loading structure during the strength and stiffness test of the herringbone slide rail, and accurately determine the strength and stiffness characteristics of the herringbone slide rail. Attached Figure Description

[0021] Figure 1 This invention relates to a test device for testing the strength and stiffness of a herringbone-shaped slide rail;

[0022] In the figure, there are slide rail test piece-1, support fixture-2, upper roller point loading fixture-3, lower roller point loading fixture-4, upper roller point tangential stop-5, lower roller point tangential stop-6, upper roller point load loading actuator-7, and lower roller point load loading actuator-8.

[0023] Figure 2 This is a schematic diagram showing the installation position of the tangential pad of the upper roller in this invention;

[0024] Figure 3 This is a schematic diagram of the position of the tangential pad of the lower roller in this invention;

[0025] Figure 4 This is a schematic diagram of the displacement measurement point of the present invention;

[0026] Figure 5 This is a schematic diagram of the strain gauge arrangement of the present invention;

[0027] Figure 6 This is a schematic diagram of the actual testing process of the present invention. Detailed Implementation

[0028] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0029] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0030] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0031] Figure 1 This invention relates to a test device for testing the strength and stiffness of a herringbone-shaped slide rail;

[0032] like Figure 1As shown, the test apparatus for testing the strength and stiffness of a herringbone slide rail may include: a slide rail test piece 1, a support clamp 2, an upper roller point loading clamp 3, a lower roller point loading clamp 4, an upper roller point tangential stop 5, a lower roller point tangential stop 6, an upper roller point load loading actuator 7, and a lower roller point load loading actuator 8. The slide rail test piece 1 is connected to the support clamp 2 by two bolts. The upper track surface of the slide rail test piece 1 contacts the upper roller point loading clamp 3 through the spherical bearing rollers provided in the upper roller point loading clamp 3; the lower track surface of the slide rail test piece 1 contacts the lower roller point loading clamp 4 through the spherical bearing rollers provided in the lower roller point loading clamp 4; the upper roller point loading clamp 3 and the upper roller point load loading actuator 7 are connected by single and double lugs and bolts. The lower roller point loading clamp 4 and the lower roller point load loading actuator 8 are connected by single and double lugs and bolts. The support fixture 2 is connected to the lower roller point tangential stop block 6 and the test base frame. The spherical bearing roller includes two cantilever shafts set on the inner side of the loading ears of the upper roller point loading fixture (3) and the lower roller point loading fixture (4). The rollers are installed on the cantilever shafts through spherical bearings. The roller sealing edge is installed in the track groove on both sides of the slide rail test piece (1).

[0033] Figure 2 This is a schematic diagram showing the installation position of the tangential pad of the upper roller in this invention;

[0034] The upper roller point tangential stop 5 is connected to the slide rail test piece 1 by two bolts. The roller contact surface set in the upper roller point loading fixture 3 of the upper roller point tangential stop 5 is parallel to the load direction.

[0035] Figure 3 This is a schematic diagram of the position of the tangential pad of the lower roller in this invention;

[0036] The plane in contact between the lower roller point tangential stop 6 and the lower roller point loading fixture 4 is parallel to the load direction.

[0037] The present invention also provides a loading method for testing the strength and stiffness of a herringbone slide rail, the method comprising the following steps:

[0038] 1) Commissioning and preloading. The pre-test load is 40% of the design load, and it is applied in increments of 5% of the design load, and then gradually unloaded to zero. The strain gauges, displacement measurement points, etc. are checked.

[0039] 2) Limiting load loading. Between 0% and 65% of the design load, load is applied in increments of 5% of the design load; between 65% and 67% of the design load, load is applied in increments of 2% of the design load; when the load reaches 67% of the design load, it is held for 30 seconds; then it is gradually unloaded to zero. During the test, strain, displacement, etc. are measured step by step.

[0040] 3) Design load loading and failure test. Between 0% and 65% of the design load, load is applied in increments of 5% of the design load; between 65% and 67% of the design load, in increments of 2% of the design load; between 67% and 70% of the design load, in increments of 3% of the design load; after 70% of the design load, load is applied in increments of 2% of the design load; when the design load reaches 100%, hold the load for 3 seconds; if the specimen does not fail, continue loading in increments of 2% of the design load until failure. If the specimen still does not fail after loading to 150%, the test is stopped.

[0041] This invention also provides a method for testing the stiffness of a slide rail, such as... Figure 4 As shown, displacement sensors are arranged at four displacement measurement points to measure the displacement during the experiment and analyze the displacement response.

[0042] This invention also provides a method for testing the strength of a slide rail, such as... Figure 5 As shown, according to Figure 5 Strain gauges are attached to the positions shown in the diagram to measure strain during the test.

[0043] Extensive experiments have shown that the implementation of this invention can ensure the accuracy of load loading, the stability of the loaded structure during the loading process, and accurately determine the strength and stiffness characteristics of the herringbone slide rail in the strength and stiffness test.

[0044] 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 test device for testing the strength and stiffness of a herringbone slide rail, used to apply load to a slide rail test piece (1); the slide rail test piece (1) includes two upper and lower tracks arranged in a herringbone pattern; Its features are, The test fixture includes: Supporting fixture (2), upper roller point loading fixture (3), lower roller point loading fixture (4), upper roller point load loading actuator (7) and lower roller point load loading actuator (8), wherein: The slide rail test piece (1) and the support fixture (2) are connected by bolts through two bolt connection holes on the slide rail test piece (1); The upper rail surface of the slide rail test piece (1) contacts the upper roller point loading fixture (3) through the spherical bearing rollers provided in the upper roller point loading fixture (3); The lower rail surface of the slide rail test piece (1) contacts the lower roller point loading fixture (4) through the spherical bearing rollers provided in the lower roller point loading fixture (4); The upper roller point loading fixture (3) and the upper roller point load loading actuator (7) are connected by single and double lugs and bolts; The lower roller point loading fixture (4) and the lower roller point load loading actuator (8) are connected by single and double lugs and bolts; The spherical bearing roller includes: two cantilever shafts set on the inner side of the loading ears of the upper roller point loading fixture (3) and the lower roller point loading fixture (4), and rollers are installed on the cantilever shafts through spherical bearings; the roller seals are installed in the track grooves on both sides of the slide rail test piece (1); It also includes: an upper roller point tangential stop (5), the upper roller point tangential stop (5) and the slide rail test piece (1) are connected by two bolts, and the contact surface between the upper roller point tangential stop (5) and the spherical bearing roller in the roller point loading fixture (3) is parallel to the load direction of the upper roller point load loading actuator (7); The lower roller point tangential stop (6) is fixed on the test base frame by a straight arm. The plane of the lower roller point tangential stop (6) in contact with the lower roller point loading fixture (4) is parallel to the load direction of the lower roller point load loading actuator (8). The joint bearing rollers set in the upper roller point loading fixture (3) and the lower roller point loading fixture (4) respectively include: a left joint bearing roller and a right joint bearing roller, which are respectively set in the track.

2. The herringbone slide rail strength and stiffness testing apparatus according to claim 1, characterized in that, in: The upper roller point load loading actuator (7) and the lower roller point load loading actuator (8) apply the test load tension.

3. A loading method for testing the strength and stiffness of a herringbone slide rail, employing the herringbone slide rail strength and stiffness testing apparatus as described in any one of claims 1-2, characterized in that, Multiple strain gauges are attached to the axes of the upper and lower tracks of the slide rail test piece (1); the support fixture (2), the upper roller point loading fixture (3), and the lower roller point loading fixture (4) are connected to the slide rail test piece (1). The slide rail test piece (1) was preloaded with a preload of 40% of the design load. The load was gradually increased by 5% of the design load increments, and then gradually unloaded to zero. The strain gauges and displacement measurement points were checked. For the slide rail test piece (1), the load was limited. Between 0% and 65% of the design load, the load was applied in increments of 5% of the design load. Between 65% and 67% of the design load, the load was applied in increments of 2% of the design load. When the load reached 67% of the design load, the load was held for 30 seconds. The load was gradually unloaded to zero. During the test, the strain and displacement measurement points were measured step by step. The slide rail test piece (1) was subjected to design load loading and failure test. Between 0% and 65% of the design load, the load was applied in increments of 5% of the design load; between 65% and 67% of the design load, the load was applied in increments of 2% of the design load; between 67% and 70% of the design load, the load was applied in increments of 3% of the design load; after 70% of the design load, the load was applied in increments of 2% of the design load; when the design load was 100%, it was held for 3 seconds. If the test specimen is not damaged, load it with 2% of the design load increments until it is damaged. If the test specimen is still not damaged after being loaded to 150%, then stop the test.

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