CN211179280U - Novel wedge cantilever beam loading device - Google Patents

Abstract

A new type of wedge-shaped cantilever beam loading device belongs to the field of mechanical testing of wedge-shaped sandwich wall panels in aviation and civil ships. It is applied to dynamic and static tests of wedge-shaped sandwich panel structure under cantilever beam load. The device includes a clamping and fixing area, a specimen connection area, and a loading area. The tight fit between the parts and the fixture ensures the smooth transmission of the load; in the clamping and fixing area, the table-shaped fixing block is fastened on the bearing plate connected with the bearing column by bolts, and the anchor bolts are used to ensure the stability of the test bench. Rigidity; in the loading area, the extension arm can be loaded according to the test requirements while ensuring that the bending moment at the root of the test piece meets the test requirements. One end of the extension arm is connected to the test piece, and the other end is connected to the loading end. The pins are used to connect the testing machine to ensure a certain degree of freedom for clamping.

Description

A new set of wedge-shaped cantilever beam loading device

technical field

The invention relates to a novel wedge-shaped body cantilever beam loading device, which belongs to the field of mechanical testing of wedge-shaped body sandwich wall panels in aviation and civil ships.

Background technique

Wedge-shaped siding is often used in various engineering fields. In order to make the siding lightweight, the sandwich method is often used. The sandwich structure is widely used in aviation, aerospace, shipbuilding and other fields due to its superior mechanical properties. It is composed of two pieces. The thin high-strength panel and the low-density sandwich are connected in a certain way, which can make full use of the high strength and high modulus of the panel material.

Honeycomb sandwich cores are particularly common in the aerospace field. The common honeycomb core layer forms are various, including regular shapes such as squares and irregular shapes. The most widely used is regular hexagonal honeycomb, and the panels are usually aluminum alloy, aromatic Fiber-paper composite materials and carbon fiber composite materials can choose different types of sandwich structures according to actual needs in different fields. The quality and load-bearing capacity of the honeycomb sandwich structure are not only related to the materials used, but also the bonding quality between the skin and the honeycomb core layer. During the service process, the wedge-shaped body panel structure has withstood the test of various complicated working conditions. Among them, the cantilever beam type of carrying form is very common, such as the load form of the UAV wings that play important tasks such as reconnaissance and vanguard strikes in future wars.

Due to the wedge-shaped body sandwich panel structure and its special structural form, a convenient and reliable fixture is used to test the high-strength wedge-shaped body honeycomb panel, or the similar wedge-shaped body sandwich panel during the cantilever beam test. The siding became the crux of the experiment. This set of fixtures also needs to meet the requirements of the bending moment at the root of the specimen while applying a certain load. In order to improve the efficiency of the test, the connection between the fixture and the testing machine also needs to be easily adjusted.

SUMMARY OF THE INVENTION

In order to overcome the problems existing in the above test and meet the requirements, the present invention provides a complete set of loading equipment, from the base to the fixed table, and then to the arm. The design also strengthens the stability of the test.

The technical scheme adopted in the present invention is: a new wedge-shaped cantilever beam loading device, which includes a test bench, a clamping and fixing area, a specimen connecting area and a loading area, and the clamping and fixing area is fixed on the test bench by a bearing column. The bearing plate is placed on both sides of the bearing column and fixed by bearing plate bolts and bearing plate nuts, and the bearing plate arc groove of the bearing plate is matched with the bearing column; the bolts on the back of the fixing block fix the table shape The block is fixed on the bearing plate; the test piece connection area adopts a wedge-shaped body test piece to connect a table-shaped fixed block at one end, and a trapezoidal section table of the extension arm at the other end; the table-shaped fixed block is provided with a fixed block slot and fixed Block blind hole, the fixed block bolts pass through the fixed block spacer and one end of the wedge-shaped body test piece and act on the fixed block blind hole; The cross-section table cushion block, the other end of the wedge-shaped body specimen, the cross-section table through hole and the cross-section table nut interact with the cross-section table nut; the loading area adopts one end of the extension arm to connect the conversion joint through a pin.

The lower surface of the fixed block spacer is smooth, and the fixed block spacer has the same slope as the wedge-shaped body sample;

The conversion joint, the extension arm and the wedge-shaped body test piece are all on the centerline of the bearing plate on the test bench.

In the clamping and fixing area, a table-shaped fixing block with a slot is used to closely fit the test piece, and the end face of the table-shaped fixing block is opened with three semi-transparent threaded holes corresponding to the gasket, and the back bottom The end has six threaded holes distributed in two rows, corresponding to the bearing plate on the test bench for fixing.

The test piece connection area adopts the spacer block and the bolt to connect the test piece. The lower plate of the spacer block is smooth and has the same slope as the test piece. The tight fit between the parts and the fixture ensures the smooth and even transmission of the load. The purpose of using an extension arm in the loading area is to achieve the required load for the test and at the same time to ensure that the bending moment at the root of the test piece meets the test requirements. At the end close to the test piece, three through screw holes are opened in the extension arm, and the spacer block, the test piece and the extension arm are fastened together by bolts. At the loading end of the extension arm, it is connected to the testing machine in the form of an adapter to facilitate flexible loading and unloading of the test piece.

The extension arm of the loading area is solid. At the end close to the test piece, the extension arm has three through screw holes, and the roughness of the transition joint is large, which is used for the clamping of the testing machine. Other bolts and gaskets are solid structures. , and is integrally formed.

All pads in the connection area of the test piece have the same angle and are solid. The adapter, the extension arm and the test piece are all on the center line of the bearing plate on the test bench. The positions of the holes are corresponding and the pitches are the same, the table-shaped fixing block corresponds to the positions of the screw holes of the lateral fixing plate on the test bench and the pitches are the same, and the extension arm is connected to the outside with pins.

The extension arm of the loading area has a rectangular section, and both ends are specially treated. One end is connected to the testing machine, and the adapter is connected with a pin. The other end is a stage with a trapezoidal section. , and can clamp the spacer block to ensure the stability of the test; the fixed table in the clamping and fixed area is also at a certain angle with the horizontal plane, the groove is fixed to fix the gasket, and the bolts pass through the gasket and the test piece to directly lock with the fixed table; The platform is connected to the ground with bolts.

The beneficial effects of the present invention are as follows: the device includes a test stand, a clamping and fixing area, a connecting area for the specimen and a loading area: in the connecting area for the specimen, the specimen is fixed to the specimen through the spacer block and the screw having the same slope as the wedge-shaped specimen. The clamps in the area and the area are connected to realize the close fit between the specimen and the clamp and ensure the smooth transmission of the load; clamp the fixed area, and fasten the table-shaped fixed block on the bearing plate connected with the bearing column by bolts. , and ensure the rigidity of the test bench through the anchor bolts; in the loading area, the extension arm can be loaded according to the test requirements, while ensuring that the bending moment at the root of the test piece meets the test requirements, one end is connected to the test piece, and the other end is connected to the loading end. , and use adapters and pins at the loading end to connect the testing machine to ensure a certain degree of freedom for clamping.

All the parts of the device are solid, and the connecting bolts and pins are of different sizes and lengths, all of which are designed according to the test requirements, which realizes the stability of the test and the controllability of the load. And when the strength meets the requirements, a certain degree of freedom is ensured for clamping, and the advantages of flexible mounting, dismounting and switching are realized. The design of the test bench can strengthen the test piece, the measurement is more accurate, and it will not loosen, so as to avoid the influence of the bearing movement factor outside the test measurement on the test.

The device adopts a simple and quick method to test the strength of the high-strength wedge-shaped body sandwich material, and can improve the utilization rate of the fixture when a large number of repeated tests are performed. The use of inclined angle gaskets and fixed blocks with clamping grooves clamps the test piece, effectively solving the problem of uneven and unstable load transmission. The adapter is used to facilitate the connection of the testing machine. The use of the extension arm provides a way of applying the test load, and the upper and lower symmetrical bolt connections are convenient for the loading and unloading of the test piece.

Description of drawings

Figure 1 is a schematic diagram of a new wedge-shaped cantilever beam loading device.

FIG. 2 is an exploded view of the clamping securing area.

Figure 3 is an exploded view of the connection area of the test piece.

Figure 4 is an exploded view of the loading area.

In the picture: 1. Test bench, 2. Bearing plate, 3. Bearing column, 4. Bearing plate arc groove, 5. Bearing plate bolt, 6. Bearing plate nut, 7. Platform-shaped fixing block , 8, the bolts on the back of the fixed block, 9, the slot of the fixed block, 10, the blind hole of the fixed block, 11, the bolts of the fixed block, 12, the spacer block of the fixed block, 13, the wedge-shaped body specimen, 14, the extension arm, 15, the trapezoid Section table, 16, Section table spacer, 17, Section table bolt, 18, Section table nut, 19, Section table slot, 20, Section table through hole, 21, Adapter, 22, Pin.

Detailed ways

The system of the present utility model patent is further described below with reference to the accompanying drawings, in which the same reference numerals refer to the same elements throughout. It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description The present invention and simplified description, rather than indicating that the referred elements must have a particular orientation and configuration.

Figures 1 to 4 show a new type of wedge-shaped cantilever beam loading device, which includes a test bench 1, a clamping and fixing area, a specimen connecting area and a loading area. The clamping and fixing area is fixed on the On the test bench 1, the bearing plate 2 is placed on both sides of the bearing column 3 and is fixed by the bearing plate bolt 5 and the bearing plate nut 6, and the bearing plate arc groove 4 of the bearing plate 2 is in line with the bearing column 3. Matching; bolts 8 on the back of the fixing block fix the table-shaped fixing block 7 on the bearing plate 2; 15; the table-shaped fixed block 7 is provided with a fixed block slot 9 and a fixed block blind hole 10, and the fixed block bolt 11 passes through the fixed block spacer 12 and one end of the wedge-shaped body test piece 13 and acts on the fixed block blind hole 10. The trapezoidal section table 15 is provided with a section table slot 19 and a section table through hole 20, and the section table bolt 17 passes through the section table block 16, the other end of the wedge-shaped body test piece 13, the section table through hole 20 and the section table The nut 18 interacts with each other; the loading area adopts one end of the extension arm 14 to connect the conversion joint 21 through the pin 22 .

The lower surface of the fixed block spacer 12 is smooth, and the slope of the fixed block spacer 12 and the wedge-shaped body specimen 13 is the same;

The conversion joint 21 , the extension arm 14 and the wedge-shaped body test piece 13 are all on the center line of the bearing plate 2 on the test bench 1 .

Next we describe in detail how to implement it. Before the test, make sure that the test bed 1 has been fixed, and make sure that all the bearing plate bolts 5 and bearing plate nuts 6 above the test bed are fastened.

It should be noted that, during the implementation of the fixture, the specific length of the extension arm 14 can be designed according to the load required for the test. Since it is a solid part, its influence cannot be ignored in small parts and fatigue tests.

The assembly of the fixture and the test piece is shown in Figure 3. First, the extension arm 14 and the wedge-shaped body test piece 13 are assembled with the cross-section table bolt 17 and the cross-section table spacer block 16, and then the fixed block bolt 11 and the fixed block spacer block 12 are used to assemble the table. The fixed block 7 is connected to the left end of the wedge-shaped specimen 13 . Assemble the above-assembled workpiece to the fixing frame on the test bench, make sure that the bolts 8 on the back of the fixing block are tightened, and then assemble the adapter 21, insert the pin 22, as shown in Figure 4, and finally connect the adapter 21 to the testing machine. fixed. The final assembly is shown in Figure 1. Both ends of the specimen are clamped, and both ends are fixed ends, so as to meet the test requirements.

The device adopts a simple and quick method to test the strength of the high-strength wedge-shaped body sandwich material, and can improve the utilization rate of the fixture when a large number of repeated tests are performed. The use of inclined angle gaskets and fixed blocks with clamping grooves clamps the test piece, effectively solving the problem of uneven and unstable load transmission. The adapter is used to facilitate the connection of the testing machine. The use of the extension arm provides a way of applying the test load, and the upper and lower symmetrical bolt connections are convenient for the loading and unloading of the test piece.

Claims (3)

1. A set of novel wedge-shaped cantilever beam loading device, which includes a test bench (1), a clamping and fixing area, a specimen connection area and a loading area, characterized in that: the clamping and fixing area adopts a bearing column (3) It is fixed on the test bench (1), the bearing plate (2) is placed on both sides of the bearing column (3) and is fixed by the bearing plate bolts (5) and the bearing plate nut (6). The arc groove (4) of the bearing plate is matched with the bearing column (3); the bolts (8) on the back of the fixing block fix the table-shaped fixing block (7) on the bearing plate (2); the test piece is connected One end of the wedge-shaped specimen is connected to the table-shaped fixed block (7), and the other end is connected to the trapezoidal section table (15) of the extension arm (14); the table-shaped fixed block (7) is provided with a fixed block slot (9) and the blind hole (10) of the fixed block, the bolts (11) of the fixed block pass through the spacer of the fixed block (12) and one end of the wedge-shaped body specimen (13) and act on the blind hole (10) of the fixed block; the trapezoidal section table (15) A cross-section table clamping slot (19) and a cross-section table through hole (20) are provided, and the cross-section table bolt (17) passes through the cross-section table spacer block (16), the other end of the wedge-shaped body specimen (13), and the cross-section table. The through hole (20) interacts with the section table nut (18); the loading area adopts one end of the extension arm (14) to connect the conversion joint (21) through the pin (22). 2. A new set of wedge-shaped cantilever beam loading device according to claim 1, characterized in that: the lower surface of the fixed block spacer (12) is smooth, the fixed block spacer (12) and the wedge-shaped body test piece ( 13) have the same slope; the lower surface of the cross-section table block (16) is smooth, and the cross-section table block (16) has the same slope as the wedge-shaped specimen (13). 3. A new set of wedge-shaped cantilever beam loading device according to claim 1, characterized in that: the conversion joint (21), the extension arm (14) and the wedge-shaped body test piece (13) are all placed on the test bench (1). ) on the center line of the upper bearing plate (2).

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