CN211179280U - Novel wedge cantilever beam loading device - Google Patents
Novel wedge cantilever beam loading device Download PDFInfo
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- CN211179280U CN211179280U CN201921925336.3U CN201921925336U CN211179280U CN 211179280 U CN211179280 U CN 211179280U CN 201921925336 U CN201921925336 U CN 201921925336U CN 211179280 U CN211179280 U CN 211179280U
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Abstract
A novel wedge cantilever beam loading device belongs to the field of mechanical tests of wedge sandwich panels in aviation and civil ships. The method is applied to dynamic and static tests of the wedge-shaped sandwich wall plate structure under the load of a cantilever beam. The device includes centre gripping fixed area, test piece joining region, loading district: the test piece connecting area is used for connecting the test piece with the clamp in the fixing area and the area through the cushion block and the screw which have the same gradient with the wedge test piece, so that the test piece is tightly attached to the clamp, and the stable transmission of load is ensured; the fixing area is clamped, the table-shaped fixing block is fastened on a bearing plate connected with the bearing column through bolts, and the rigidity of the test bed is ensured through foundation bolts; in the loading area, the extension arm can apply load according to the test requirement, meanwhile, the bending moment borne by the root of the test piece is ensured to meet the test requirement, one end of the extension arm is connected with the test piece, the other end of the extension arm is connected with the loading end, and the adapter and the pin are adopted at the loading end to connect the testing machine, so that a certain degree of freedom is ensured to facilitate clamping.
Description
Technical Field
The invention relates to a novel wedge-shaped cantilever beam loading device, and belongs to the field of mechanical tests of wedge-shaped sandwich panels in aviation and civil ships.
Background
Wedge-shaped wall panels are commonly used in various engineering fields, in order to make the wall panels light, sandwich methods are often adopted, sandwich structures are widely applied to the fields of aviation, aerospace, ships and the like due to the superior mechanical properties of the sandwich structures, the wedge-shaped wall panels are formed by connecting two thin high-strength panels and low-density sandwich in a certain mode, and the characteristics of high strength and high modulus of panel materials can be fully utilized.
The honeycomb sandwich is particularly common in the aerospace field, the common honeycomb sandwich layer forms are various, namely regular shapes such as squares and irregular shapes, the most widely applied honeycomb is a regular hexagon honeycomb, the face plate is usually an aluminum alloy, aramid paper composite material and a carbon fiber composite material, and sandwich structures of different types can be selected according to actual requirements in different fields. The quality and the bearing capacity of the honeycomb sandwich structure are related to the used materials, the bonding quality between the skin and the honeycomb core layer is very important, and the strength is very high when the skin and the honeycomb core layer are connected together by adopting a welding technology. The wall plate structure of the wedge-shaped body is tested under various complex working conditions in the service process. The cantilever beam type bearing mode is quite common, such as the load mode borne by the wings of the unmanned aerial vehicle playing important tasks of reconnaissance, pioneer striking and the like in future war.
Due to the wedge-shaped sandwich wall plate structure and the special structural form, when a cantilever beam test is carried out, a convenient and reliable clamp is adopted to test the wedge-shaped honeycomb wall plate with high strength, or the wedge-shaped sandwich wall plate similar to the wedge-shaped honeycomb wall plate becomes the key of the test. The clamp needs to meet the requirement of applying a certain load and the requirement of the bending moment of the root of the test piece. In order to improve the efficiency of the test, the connection of the clamp and the testing machine also needs to be conveniently adjusted.
Disclosure of Invention
In order to overcome the problems of the test and meet the requirements, the invention provides a set of complete loading equipment from a base to a fixed table and then to an arm, the clamp effectively solves the controllability of the load, and is flexible and detachable, and the design of the test table further strengthens the stability of the test.
The technical scheme adopted by the invention is as follows: the novel wedge-shaped cantilever beam loading device comprises a test bed, a clamping fixing area, a test piece connecting area and a loading area, wherein the clamping fixing area is fixed on the test bed by adopting a force bearing column, force bearing plates are arranged on two sides of the force bearing column and fixed with force bearing plate nuts through force bearing plate bolts, and force bearing plate arc-shaped grooves of the force bearing plates are matched with the force bearing column; the table-shaped fixed block is fixed on the bearing plate by bolts on the back of the fixed block; the test piece connecting area adopts a trapezoid cross section table with one end of a wedge-shaped test piece connected with the table-shaped fixed block and the other end connected with the extension arm; the table-shaped fixing block is provided with a fixing block clamping groove and a fixing block blind hole, and a fixing block bolt penetrates through a fixing block cushion block and one end of the wedge-shaped test piece and acts on the fixing block blind hole; the trapezoidal section table is provided with a section table clamping groove and a section table through hole, and a section table bolt penetrates through a section table cushion block, the other end of the wedge-shaped body test piece and the section table through hole to act with a section table nut; the loading area adopts one end of an extension arm to be connected with the adapter through a pin.
The lower surface of the fixed block cushion block is smooth, and the slope of the fixed block cushion block is the same as that of the wedge-shaped body test piece; the lower surface of the section table cushion block is smooth, and the slope of the section table cushion block is the same as that of the wedge-shaped body test piece.
The adapter joint, the extension arm and the wedge body test piece are all arranged on the central line of the bearing plate on the test bed.
The clamping fixing area is formed by tightly attaching a table-shaped fixing block with a clamping groove to a test piece, three semi-permeable threaded holes corresponding to the gasket are formed in the end face of the table-shaped fixing block, and two rows of six threaded holes are formed in the rear bottom end of the table-shaped fixing block and correspond to the bearing plate on the test bed so as to be fixed.
The test piece connecting area adopts cushion and bolted connection test piece, and the cushion hypoplastron is smooth, has the slope the same with the test piece, and three through-holes that run through are all opened to all gaskets for be convenient for tighten the screw, realized closely laminating of test piece and anchor clamps, guaranteed the steady even transfer of load. The loading area adopts the extension arm to ensure that the bending moment borne by the root of the test piece meets the test requirement while achieving the load required by the test. At the one end that is close to the test piece, three penetrating screw holes are opened to the extension arm, and the cushion, test piece and extension arm are fastened together through the bolt. And the loading end of the extension arm is connected to the testing machine in a conversion joint mode so as to be convenient for flexibly loading and unloading the test piece.
The extension arm in loading district is the entity, and in the one end that is close to the test piece, three penetrating screw is opened to the extension arm, and crossover sub department roughness is great for the testing machine centre gripping, and other bolt gasket are solid structure, and integrated into one piece.
All cushion blocks of the test piece connecting area have the same angle and are solid, the adapter, the extension arm and the test piece are all arranged on the central line of the bearing plate on the test bed, the gasket corresponds to the threaded hole positions of the extension arm and the platform-shaped fixed block, the thread pitches of the platform-shaped fixed block and the threaded hole position of the transverse fixed plate on the test bed are the same, and the extension arm is connected with the outside through a pin.
The extension arm of the loading area has a rectangular cross section, both ends of the extension arm are specially processed, one end of the extension arm is connected with the testing machine and is connected with the adapter through a pin, the other end of the extension arm is a platform with a trapezoidal cross section, and the upper surface and the lower surface of the extension arm are respectively provided with a clamping groove which can fix a test piece and clamp a cushion block, so that the stability of the test is ensured; a fixing table for clamping the fixing area forms a certain angle with the horizontal plane, the clamping groove fixes the gasket, and the bolt penetrates through the gasket and the test piece to be directly locked with the fixing table; the test bed is connected with the ground through bolts.
The invention has the beneficial effects that: the device includes test bench, centre gripping fixed area, test piece joining region and loading district: the test piece connecting area is used for connecting the test piece with the clamp in the fixing area and the area through the cushion block and the screw which have the same gradient with the wedge test piece, so that the test piece is tightly attached to the clamp, and the stable transmission of load is ensured; the fixing area is clamped, the table-shaped fixing block is fastened on a bearing plate connected with the bearing column through bolts, and the rigidity of the test bed is ensured through foundation bolts; in the loading area, the extension arm can apply load according to the test requirement, meanwhile, the bending moment borne by the root of the test piece is ensured to meet the test requirement, one end of the extension arm is connected with the test piece, the other end of the extension arm is connected with the loading end, and the adapter and the pin are adopted at the loading end to connect the testing machine, so that a certain degree of freedom is ensured to facilitate clamping.
All parts of the device are solid, the connecting bolts and the pins are different in size and length and are designed according to test requirements, and the stability and the controllability of the test are realized. And under the condition that the strength meets the requirement, certain degree of freedom is ensured so as to facilitate clamping, and the advantages of flexible assembly and disassembly and switchability are realized. The test piece can be reinforced by the design of the test bed, the measurement is more accurate, the looseness is avoided, and the influence of the support moving factors outside the test measurement on the test is avoided.
The device adopts a simple and rapid method to test the strength of the wedge-shaped sandwich material with high strength, and can improve the utilization rate of the clamp when a large number of repeated tests are carried out. Adopt the gasket that has inclination and the fixed block that has the draw-in groove, the chucking has tested the piece, the effectual uneven unstable problem of load transfer that has solved. The adapter is adopted to facilitate the connection of the testing machine. The extension arm is adopted to provide a test load applying mode, and the bolt connection in the vertical symmetry facilitates the assembly and disassembly of the test piece.
Drawings
Fig. 1 is a schematic diagram of a novel wedge cantilever loading device.
Fig. 2 is an exploded view of the clamp attachment area.
Fig. 3 is an exploded view of the test piece connection region.
Fig. 4 is an exploded view of the loading zone.
In the figure: 1. the test bed comprises a test bed body, 2, a bearing plate, 3, a bearing column, 4, a bearing plate arc-shaped groove, 5, a bearing plate bolt, 6, a bearing plate nut, 7, a table-shaped fixing block, 8, a fixing block back bolt, 9, a fixing block clamping groove, 10, a fixing block blind hole, 11, a fixing block bolt, 12, a fixing block cushion block, 13, a wedge-shaped body test piece, 14, an extension arm, 15, a trapezoidal section table, 16, a section table cushion block, 17, a section table bolt, 18, a section table nut, 19, a section table clamping groove, 20, a section table through hole, 21, a conversion joint, 22 and a pin.
Detailed Description
The system of the present invention is further described with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout. It should be understood that the terms "above," "below," "left," "right," "vertical," and the like are used in an orientation or positional relationship relative to one another as illustrated in the figures, but are merely used to facilitate describing and simplify the present invention and are not intended to indicate that the referenced elements must have a particular orientation or configuration.
Fig. 1 to 4 show a set of novel wedge cantilever beam loading device, which comprises a test bed 1, a clamping fixing area, a test piece connecting area and a loading area, wherein the clamping fixing area is fixed on the test bed 1 by adopting a bearing column 3, bearing plates 2 are arranged on two sides of the bearing column 3 and fixed with bearing plate nuts 6 through bearing plate bolts 5, and bearing plate arc-shaped grooves 4 of the bearing plates 2 are matched with the bearing column 3; the table-shaped fixed block 7 is fixed on the bearing plate 2 by a bolt 8 at the back of the fixed block; the test piece connecting area adopts a trapezoid cross section table 15, one end of a wedge test piece is connected with the table-shaped fixing block 7, and the other end of the wedge test piece is connected with the extension arm 14; the table-shaped fixing block 7 is provided with a fixing block clamping groove 9 and a fixing block blind hole 10, and a fixing block bolt 11 penetrates through a fixing block cushion block 12 and one end of a wedge-shaped body test piece 13 and acts on the fixing block blind hole 10; the trapezoidal section table 15 is provided with a section table clamping groove 19 and a section table through hole 20, and a section table bolt 17 penetrates through a section table cushion block 16, the other end of the wedge test piece 13 and the section table through hole 20 to act with a section table nut 18; the loading area is connected to the adapter 21 by a pin 22 using one end of the extension arm 14.
The lower surface of the fixed block cushion block 12 is smooth, and the gradient of the fixed block cushion block 12 is the same as that of the wedge-shaped body test piece 13; the lower surface of the cross-section table cushion block 16 is smooth, and the slope of the cross-section table cushion block 16 is the same as that of the wedge test piece 13.
The adapter 21, the extension arm 14 and the wedge body test piece 13 are all arranged on the central line of the bearing plate 2 on the test bed 1.
Next we describe in detail how to implement. Before testing, the test bed 1 is fixed, and all the bearing plate bolts 5 and the bearing plate nuts 6 above the test bed are fastened.
It should be noted that in the practice of the present clamp, the specific length of the extension arm 14 can be designed according to the load required for the test, and since it is a solid component, its effect is not negligible in small parts and fatigue tests.
Assembling the clamp and the test piece as shown in fig. 3, firstly, the extension arm 14 and the wedge test piece 13 are assembled by using the cross-section table bolt 17 and the cross-section table cushion block 16, and then the table-shaped fixing block 7 and the left end of the wedge test piece 13 are connected by using the fixing block bolt 11 and the fixing block cushion block 12. After the workpiece assembled on the upper surface is assembled on a fixed frame on a test bed and the bolt 8 on the back surface of the fixed block is fastened, the pin 22 is inserted into the adapter 21 after the adapter is assembled, as shown in fig. 4, and finally the adapter 21 is connected and fixed with the testing machine. Finally, assembly and synthesis are carried out as shown in figure 1, two ends of the test piece are clamped, and two ends of the test piece are fixed ends, so that the test requirements are met.
The device adopts a simple and rapid method to test the strength of the wedge-shaped sandwich material with high strength, and can improve the utilization rate of the clamp when a large number of repeated tests are carried out. Adopt the gasket that has inclination and the fixed block that has the draw-in groove, the chucking has tested the piece, the effectual uneven unstable problem of load transfer that has solved. The adapter is adopted to facilitate the connection of the testing machine. The extension arm is adopted to provide a test load applying mode, and the bolt connection in the vertical symmetry facilitates the assembly and disassembly of the test piece.
Claims (3)
1. One set of novel wedge cantilever beam loading device, it includes test bench (1), centre gripping fixed area, test piece joining region and loading district, its characterized in that: the clamping and fixing area is fixed on the test bed (1) by adopting a bearing column (3), the bearing plates (2) are arranged on two sides of the bearing column (3) and fixed with bearing plate nuts (6) through bearing plate bolts (5), and bearing plate arc-shaped grooves (4) of the bearing plates (2) are matched with the bearing column (3); the table-shaped fixed block (7) is fixed on the bearing plate (2) by a bolt (8) at the back of the fixed block; the test piece connecting area adopts a trapezoid cross section table (15) with one end of a wedge test piece connected with the table-shaped fixing block (7) and the other end connected with the extension arm (14); a fixing block clamping groove (9) and a fixing block blind hole (10) are formed in the table-shaped fixing block (7), and a fixing block bolt (11) penetrates through a fixing block cushion block (12) and one end of a wedge-shaped body test piece (13) and acts on the fixing block blind hole (10); the trapezoidal section table (15) is provided with a section table clamping groove (19) and a section table through hole (20), and a section table bolt (17) penetrates through a section table cushion block (16), the other end of the wedge-shaped body test piece (13), the section table through hole (20) and acts with a section table nut (18); the loading area is connected with a conversion joint (21) through a pin (22) by adopting one end of an extension arm (14).
2. The novel set of wedge cantilever beam loading apparatus of claim 1, wherein: the lower surface of the fixed block cushion block (12) is smooth, and the gradient of the fixed block cushion block (12) is the same as that of the wedge-shaped body test piece (13); the lower surface of the section table cushion block (16) is smooth, and the gradient of the section table cushion block (16) is the same as that of the wedge test piece (13).
3. The novel set of wedge cantilever beam loading apparatus of claim 1, wherein: the adapter joint (21), the extension arm (14) and the wedge test piece (13) are all arranged on the central line of the bearing plate (2) on the test bed (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921925336.3U CN211179280U (en) | 2019-11-10 | 2019-11-10 | Novel wedge cantilever beam loading device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921925336.3U CN211179280U (en) | 2019-11-10 | 2019-11-10 | Novel wedge cantilever beam loading device |
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| Publication Number | Publication Date |
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| CN211179280U true CN211179280U (en) | 2020-08-04 |
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| CN201921925336.3U Expired - Fee Related CN211179280U (en) | 2019-11-10 | 2019-11-10 | Novel wedge cantilever beam loading device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618027A (en) * | 2019-11-10 | 2019-12-27 | 大连理工大学 | Novel wedge cantilever beam loading device |
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- 2019-11-10 CN CN201921925336.3U patent/CN211179280U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618027A (en) * | 2019-11-10 | 2019-12-27 | 大连理工大学 | Novel wedge cantilever beam loading device |
| CN110618027B (en) * | 2019-11-10 | 2024-08-06 | 大连理工大学 | Novel wedge cantilever beam loading device |
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Granted publication date: 20200804 |