Variable inclination angle tool for testing pull-off performance of composite material plate fastener

Abstract

The utility model relates to the technical field of detection tools, in particular to a variable-dip-angle tool for testing the pull-off performance of a composite material plate fastener, which comprises an upper tool and a lower tool, the upper tool comprises a disc, and the bottom of the disc is fixedly connected with an upper pull rod; the upper pull plates are arranged at the bottom of the upper pull rod at intervals; the lower tool comprises an adjusting cross beam, an adjusting plate is slidably mounted on the adjusting cross beam in the length direction, a mounting hole is formed in the upper surface of the adjusting plate, and a fastener sequentially penetrates through the upper pull plate and the mounting hole from bottom to top and then is connected with the bottom of the upper pull rod; the bottom of the adjusting beam is fixedly connected with a lower pull rod, the bottom of the lower pull rod is provided with an angle adjusting mechanism, and the bottom of the angle adjusting mechanism is fixedly connected with a connecting rod. The angle adjusting mechanism is used for swinging the lower pull rod along a horizontal axis perpendicular to the length direction of the adjusting cross beam; through the structural design of the adjusting cross beam and the angle adjusting mechanism, the problem that in the prior art, a fastener variable dip angle pull-off test cannot be carried out is solved.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling technology, and in particular to a variable tilt angle tooling for testing the pull-out performance of fasteners on composite material plates. Background Technology

[0002] Composite material plates are increasingly used in aerospace technology and new energy battery packs. With the development of science and technology, the demand for large-size and structurally complex components in industry is becoming more and more urgent. Due to the limitations of the manufacturing process, it is difficult to directly manufacture large and complex-shaped composite material plates. Therefore, using small-size simple components for secondary connection is an effective way to solve this problem.

[0003] Composite material plates have poor high-temperature mechanical properties, making it impractical to connect materials through high-temperature melting. The simplest and most direct method is to achieve mechanical connection using bolts, screws, and other mechanical fasteners. However, while there has been much experimental research on the mechanical properties of composite materials in recent years, research on the pull-out performance of fasteners on composite material plates is relatively limited, especially on the pull-out performance of fasteners with varying tilt angles (including vertical tension). Therefore, researching the test technology for the pull-out performance of fasteners on composite material plates with varying tilt angles and establishing a scientific evaluation system for the pull-out performance of fasteners on composite material plates is essential for supporting the development of aerospace technology and new energy battery packs.

[0004] Therefore, in order to address the above problems, this utility model urgently needs to provide a variable tilt angle tooling for testing the pull-out performance of fasteners on composite material plates. Utility Model Content

[0005] The purpose of this invention is to provide a variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates. By adjusting the structural design of the crossbeam and the angle adjustment mechanism, this invention solves the problems existing in the prior art, such as the inability to perform pull-out tests on fasteners with variable tilt angles.

[0006] A variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates includes an upper fixture and a lower fixture. The upper fixture includes a disc for clamping with a fixture on a testing machine, and an upper pull rod is fixedly connected to the bottom of the disc. It also includes upper pull plates spaced apart at the bottom of the upper pull rod.

[0007] The lower fixture includes an adjusting beam, on which a horizontally adjustable plate is slidably mounted along its length. The upper surface of the adjusting plate has a mounting hole that passes through the adjusting plate. Fasteners pass through the upper pull plate and the mounting hole from bottom to top and are then fixed to the bottom of the upper pull rod.

[0008] A pull rod is fixed to the bottom of the adjusting beam, and an angle adjustment mechanism is installed at the bottom of the pull rod. A connecting rod for connecting to the fixture on the testing machine is fixed to the bottom of the angle adjustment mechanism. The angle adjustment mechanism is used to swing the pull rod along a horizontal axis perpendicular to the length direction of the adjusting beam.

[0009] Furthermore, the angle adjustment mechanism includes a worm gear fixed to the bottom of the pull rod with its axis perpendicular to the length direction of the adjustment beam, and a worm with its axis parallel to the length direction of the adjustment beam meshing with the bottom of the worm gear; an adjustment base is installed on the top of the connecting rod, and the worm is screwed to the adjustment base.

[0010] Furthermore, two first mounting supports are installed at intervals on the top of the adjusting base. One end of the worm gear is screwed to one of the first mounting supports, and the other end is slidably connected to the other first mounting support.

[0011] Furthermore, two second mounting supports are installed on both sides of the top of the adjusting base, and worm gear shafts are provided on both sides of the worm gear, with the two ends of the worm gear shafts rotatably connected to the two second mounting supports respectively.

[0012] Furthermore, a knob is provided at one end of the worm gear.

[0013] Furthermore, the top of the adjusting beam is provided with a mounting groove, and multiple screws are rotatably connected between the two ends of the mounting groove. The adjusting plate is screwed to each screw and is used to move along the length of the adjusting beam as the screws rotate.

[0014] Furthermore, the diameter of the mounting hole is larger than the diameter of the bottom of the upper pull rod.

[0015] Furthermore, the top of the upper pull rod is provided with two vertically arranged fixing plates, and the disc is clamped between the two fixing plates and connected to the two fixing plates by bolts.

[0016] Furthermore, the side walls and bottom walls of the mounting groove are each provided with a first weight-reducing groove that passes through the adjusting beam.

[0017] Furthermore, the adjustment base is provided with multiple second weight-reducing grooves that penetrate the adjustment base at intervals.

[0018] The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates provided by this utility model has the following advantages compared with the prior art:

[0019] This utility model provides a variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates. A disc can be clamped to the upper clamp of a testing machine, and because it is a disc, the upper clamp can hold the disc at various angles. An adjusting plate can separate the upper pull plate from the upper pull rod. Through the mounting hole in the center of the adjusting plate, the fastener can pass through the upper pull plate and the mounting hole to connect with the upper pull rod. Pulling the upper pull rod upwards achieves a pull-out test between the upper pull plate and the fastener. The angle of the lower pull rod can be adjusted through the meshing of the worm gear and worm. When the lower pull rod and the worm axis are not perpendicular, the position of the adjusting plate can be changed by using a screw to adjust the top of the upper pull rod to be on the same vertical line as the bottom of the lower pull rod. At this time, using the testing machine to perform pull tests on the disc and the lower pull rod respectively achieves a variable tilt angle test for the pull-out performance of fasteners on composite material plates. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram (three-dimensional view) of the variable tilt angle tooling for testing the pull-out performance of fasteners on composite material plates as described in this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Disc; 2. Upper pull rod; 201. Fixing plate; 3. Upper pull plate; 4. Adjusting crossbeam; 401. Mounting slot; 402. Screw; 403. First weight reduction slot; 5. Adjusting plate; 501. Mounting hole; 6. Lower pull rod; 7. Connecting rod; 8. Adjusting base; 801. First mounting support; 802. Second mounting support; 803. Second weight reduction slot; 9. Worm gear; 10. Worm wheel; 11. Worm wheel shaft; 12. Knob. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1 As shown, the present invention provides a variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates, including an upper fixture and a lower fixture. The upper fixture includes a disc 1 for clamping with a fixture on a testing machine, and an upper pull rod 2 is fixedly connected to the bottom of the disc 1; it also includes an upper pull plate 3 spaced apart at the bottom of the upper pull rod 2.

[0028] The lower fixture includes an adjusting beam 4, on which a horizontally set adjusting plate 5 is slidably installed along the length direction. The upper surface of the adjusting plate 5 has a mounting hole 501 that passes through the adjusting plate 5. Fasteners pass through the upper pull plate 3 and the mounting hole 501 from bottom to top and are then fixed to the bottom of the upper pull rod 2.

[0029] A pull rod 6 is fixedly connected to the bottom of the adjusting beam 4. An angle adjustment mechanism is installed at the bottom of the pull rod 6. A connecting rod 7 for connecting to the fixture on the testing machine is fixedly connected to the bottom of the angle adjustment mechanism. The angle adjustment mechanism is used to swing the pull rod 6 along a horizontal axis perpendicular to the length direction of the adjusting beam 4.

[0030] The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates provided by this utility model can be clamped by the upper clamp of the testing machine via a disc 1. Since it is a disc 1, the upper clamp can clamp the disc 1 at various angles. The upper pull plate 3 and the upper pull rod 2 can be separated by the adjusting plate 5. The fastener can pass through the upper pull plate 3 and the mounting hole 501 in the middle of the adjusting plate 5 and connect to the upper pull rod 2 in sequence. Pulling the upper pull rod 2 upward can realize the pull-out test between the upper pull plate 3 and the fastener. The angle of the lower pull rod 6 can be adjusted by the meshing of the worm gear 10 and the worm 9. When the axis of the lower pull rod 6 and the worm 9 are not perpendicular, the position of the adjusting plate 5 can be changed by the screw 402, and the top of the upper pull rod 3 can be adjusted to be on the same vertical line as the bottom of the lower pull rod 6. At this time, the testing machine is used to perform pull tests on the disc 1 and the lower pull rod 6 respectively, so as to realize the variable tilt angle test of the pull-out performance of fasteners on composite material plates.

[0031] like Figure 1 As shown, the angle adjustment mechanism includes a worm gear 10 fixed to the bottom of the pull rod 6 with its axis perpendicular to the length direction of the adjustment beam 4. The bottom of the worm gear 10 is meshed with a worm 9 whose axis is parallel to the length direction of the adjustment beam 4. An adjustment base 8 is installed on the top of the connecting rod 7, and the worm 9 is screwed to the adjustment base 8.

[0032] In this invention, the rotation of the worm 9 causes the worm wheel 10 to shift, resulting in an angular deflection at the bottom of the pull rod 6, thereby changing the inclination angle of the tensile specimen.

[0033] The maximum included angle between the axes of the pull rod 6 and the worm gear 9 is ±45°.

[0034] like Figure 1 As shown, two first mounting supports 801 are installed at intervals on the top of the adjusting base 8. One end of the worm gear 9 is screwed to one of the first mounting supports 801, and the other end is slidably connected to the other first mounting support 801.

[0035] like Figure 1 As shown, two second mounting supports 802 are installed on both sides of the top of the adjusting base 8, and worm gear shafts 11 are provided on both sides of the worm gear 10. The two ends of the worm gear shafts 11 are rotatably connected to the two second mounting supports 802 respectively.

[0036] like Figure 1 As shown, a knob 12 is provided at one end of the worm gear 9.

[0037] like Figure 1 As shown, the top of the adjusting beam 4 has an installation groove 401, and multiple screws 402 are rotatably connected between the two ends of the installation groove 401. The adjusting plate 5 is screwed to each screw 402 and is used to move along the length direction of the adjusting beam 4 as the screws 402 rotate.

[0038] In this embodiment, the diameter of the mounting hole 501 is larger than the diameter of the bottom of the upper pull rod 2.

[0039] like Figure 1 As shown, the top of the upper pull rod 2 is provided with two vertically arranged fixing plates 201 spaced apart, and the disc 1 is clamped between the two fixing plates 201 and connected to the two fixing plates 201 by bolts.

[0040] In this invention, after changing the angle of the lower pull rod 6, the angle of the upper pull rod 2 also changes accordingly. At this time, if a connector similar to the connecting rod 7 is used to connect with the testing machine, the connector will also be angularly offset, making it difficult to connect with the testing machine. Therefore, by setting the disc 1, this invention can ensure that the upper pull rod 2 can be clamped by the clamp of the testing machine regardless of its angle, making it easy to connect with the testing machine.

[0041] like Figure 1 As shown, the side wall and bottom wall of the mounting groove 401 are provided with a first weight-reducing groove 403 that passes through the adjusting beam 4.

[0042] like Figure 1 As shown, the adjustment base 8 has multiple second weight reduction grooves 803 that pass through it at intervals.

[0043] The embodiments of this utility model include the following steps:

[0044] 1) Take at least 8 samples that pass the visual inspection, are free of defects and dimensional discrepancies;

[0045] 2) Measure one width and one length of the sample, and at the same time measure the thickness at four positions around the center hole of the sample and the diameter of the opening. The thickness measurement is accurate to 0.01 mm, and the others are 0.02 mm.

[0046] 3) Take two samples as a group, pass the samples through the upper pull plate 3 and the mounting hole 501 from bottom to top, and lock them to the bottom of the upper pull rod 2; rotate the knob 12 so that the included angle between the axis of the lower pull rod 6 and the worm gear 9 is 0°, 15°, 30° and 45° respectively, and perform 4 groups of tests respectively.

[0047] 4) During each test, the specimen was first preloaded with a 50N load to eliminate the connection gap. Then, a tensile load was continuously applied to the specimen at a loading rate of 1.0mm / min. The test was stopped when the bolt was completely pulled out, and the load-displacement data were continuously recorded.

[0048] 5) Based on the load-displacement data of each group, plot the load-displacement curve to obtain the test results of the fastener's pull-out performance.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates, characterized in that: It includes an upper fixture and a lower fixture. The upper fixture includes a disc (1) for clamping with the fixture on the testing machine. An upper pull rod (2) is fixed to the bottom of the disc (1). It also includes an upper pull plate (3) spaced at the bottom of the upper pull rod (2). The lower fixture includes an adjusting beam (4), on which a horizontally set adjusting plate (5) is slidably installed along the length direction. The upper surface of the adjusting plate (5) is provided with a mounting hole (501) that passes through the adjusting plate (5). Fasteners pass through the upper pull plate (3) and the mounting hole (501) from bottom to top and are connected to the bottom of the upper pull rod (2). A pull rod (6) is fixedly connected to the bottom of the adjusting beam (4), and an angle adjustment mechanism is installed at the bottom of the pull rod (6). A connecting rod (7) for connecting to the fixture on the testing machine is fixedly connected to the bottom of the angle adjustment mechanism. The angle adjustment mechanism is used to swing the pull rod (6) along a horizontal axis perpendicular to the length direction of the adjusting beam (4).

2. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 1, characterized in that: The angle adjustment mechanism includes a worm gear (10) fixed to the bottom of the pull rod (6) with its axis perpendicular to the length direction of the adjustment beam (4). The bottom of the worm gear (10) is meshed with a worm (9) with its axis parallel to the length direction of the adjustment beam (4). An adjustment base (8) is installed on the top of the connecting rod (7), and the worm (9) is screwed to the adjustment base (8).

3. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 2, characterized in that: Two first mounting supports (801) are installed at a distance from each other on the top of the adjusting base (8). One end of the worm gear (9) is screwed to one of the first mounting supports (801), and the other end is slidably mounted to the other first mounting support (801).

4. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 3, characterized in that: Two second mounting supports (802) are installed on both sides of the top of the adjusting base (8). The two sides of the worm wheel (10) are provided with worm wheel shafts (11) extending outward. The two ends of the worm wheel shafts (11) are rotatably connected to the two second mounting supports (802) respectively.

5. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 4, characterized in that: A knob (12) is provided at one end of the worm (9).

6. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 5, characterized in that: The top of the adjusting beam (4) is provided with an installation groove (401). Multiple screws (402) are rotatably connected between the two ends of the installation groove (401). The adjusting plate (5) is screwed to each screw (402) and is used to move along the length direction of the adjusting beam (4) as the screws (402) rotate.

7. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 6, characterized in that: The diameter of the mounting hole (501) is larger than the diameter of the bottom of the upper pull rod (2).

8. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 7, characterized in that: The top of the upper pull rod (2) is provided with two vertically arranged fixing plates (201) spaced apart. The disc (1) is clamped between the two fixing plates (201) and connected to the two fixing plates (201) by bolts.

9. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 8, characterized in that: The side and bottom walls of the mounting groove (401) are provided with a first weight-reducing groove (403) that passes through the adjusting beam (4).

10. The variable tilt angle fixture for testing the pull-out performance of fasteners on composite material plates according to claim 9, characterized in that: Multiple second weight-reducing grooves (803) are provided on the adjusting base (8) at intervals.

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