CN106441968B - Furniture structure node bending fatigue strength testing device and testing method - Google Patents
Furniture structure node bending fatigue strength testing device and testing method Download PDFInfo
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- CN106441968B CN106441968B CN201610903337.2A CN201610903337A CN106441968B CN 106441968 B CN106441968 B CN 106441968B CN 201610903337 A CN201610903337 A CN 201610903337A CN 106441968 B CN106441968 B CN 106441968B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/001—Testing of furniture, e.g. seats or mattresses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
Abstract
The invention relates to a furniture structure node bending fatigue strength testing device and a testing method, which structurally comprises a workbench, a loading unit and a computer control system, wherein a stand column and a test piece clamping mechanism in the loading unit are arranged on a fixed bedplate in the workbench and are installed, adjusted and locked in position through a longitudinal or transverse dovetail groove rail on the fixed bedplate, and the computer control system is arranged on the workbench through a rotating arm. The test method comprises the following steps: (1) mounting and clamping a test piece; (2) installing and adjusting a loading head; (3) setting a force value and carrying out cyclic loading; (4) and (4) carrying out loading test. The advantages are that: 1) the test method can be widely applied to testing the bending fatigue strength and the durability of the furniture structure node component under compression or compression tensile load; 2) the method can provide test basis for researching the strength performance and the strain distribution of the furniture structure node; 3) 1 or more groups of loading units can be configured as required to adapt to the simultaneous test of different numbers of test pieces.
Description
Technical Field
The invention relates to a furniture structure node bending fatigue strength testing device and a testing method, which are suitable for providing test basis for furniture structure optimization, structure design, joint research and strength testing of different materials, and belong to the technical field of material and product testing.
Background
The furniture structure nodes and joints are the places most prone to damage in the use process of furniture, the requirements on the performance, the structural design and the joint strength of furniture materials are highest, the detection and the stress analysis of the structural strength of the furniture nodes not only influence the modeling design of furniture designers, but also have important theoretical and practical significance on research and development of new materials, optimization design of furniture overall structures and research on high-strength joint technologies of the new furniture materials by scientific researchers.
At present, the strength test and stress analysis of furniture structure nodes and joints at home and abroad mostly adopt the methods of static load failure test and finite element analysis. The static load failure test is to judge the structural strength by the maximum failure load (or bending moment) of the furniture structure, but the early test proves that the failure of the furniture structure mainly comes from the fatigue failure of the structural part rather than the static failure; the finite element analysis is combined with the semi-rigid property of the furniture structure node, the stress distribution condition inside the furniture node is known through a simulation method, and the strength of the structure node cannot be truly reflected due to the fact that the simple furniture part finite element analysis has no basis of a cyclic loading test and does not consider the difference of the material performance of the furniture part, and a set of analysis method with high precision and strong systematicness is not formed.
At present, the test of the overall fatigue strength of furniture is used as a product standard at home and abroad, but no definite test method and standard are provided for the fatigue strength of furniture structure nodes or joint nodes, actually, the fatigue strength of the furniture structure nodes is researched to be more suitable for furniture structure design and research and development, the node strength of furniture parts under different furniture materials, different tenon-and-mortise structures, different metal connecting piece structures and different glue joint forms is researched, the target is more accurate, the investment is less, and the flexibility is higher.
Disclosure of Invention
The invention provides a furniture structure node bending fatigue strength testing device and a testing method, which aim to overcome the defects in the prior art, can be widely applied to testing the bending fatigue strength and the durability of furniture structure node parts under compression or compression tensile load, provides test basis for furniture structure optimization, structure design, joint research, structure node strength and strain distribution test of different materials, and has important theoretical guidance significance and practical application value for research and development of a new furniture material high-strength joint technology and research of a furniture overall structure optimization design technology.
The technical solution of the invention is as follows: a furniture structure node bending fatigue strength testing device structurally comprises a workbench, a loading unit and a computer control system, wherein a stand column 12 and a test piece clamping mechanism 7 in the loading unit are respectively arranged on a fixed bedplate 11 in the workbench, and are respectively installed, adjusted and locked in position through a longitudinal dovetail groove rail or a transverse dovetail groove rail on the fixed bedplate 11, and clamping and loading of a test piece 17 are realized; a computer control system 16 is mounted on the table by means of a rotating arm for operating the loading unit.
The test method comprises the following steps:
(1) mounting and clamping a test piece;
(2) installing and adjusting a loading head;
(3) setting a force value and carrying out cyclic loading;
(4) the loading test is automatically controlled and processed by a computer control system.
The invention has the advantages that:
1) the test method can be widely applied to testing the bending fatigue strength and the durability of the furniture structure node component under compression or compression tensile load;
2) the method can provide a test basis for researching the strength performance and the strain distribution of the furniture structure node, and has important theoretical guiding significance and practical application value for research and development of a new furniture material high-strength bonding technology and research of a furniture overall structure optimization design technology;
3) the test device can be configured with 1 or more groups of loading units as required to adapt to the simultaneous test of different numbers of test pieces, the test pieces can be two-dimensional joint pieces, three-dimensional joint pieces or two-dimensional bending pieces, and the cross sections of the test pieces can be square, circular or elliptical.
Drawings
Fig. 1 is a partial structure schematic diagram of a furniture structure node bending fatigue strength testing device.
Fig. 2 is a schematic view of the structure of the pulling and pressing force loading head 15. The device can be arranged at the lower end of a tension pressure sensor 5 and is used in replacement with a pressure loading head 6, so that a one-pressure one-tension cyclic loading test and a pressurization cyclic loading test are respectively realized.
Fig. 3 is a schematic view of the overall structure and specimen mounting and clamping of the present invention. 1 or more groups of loading units can be configured as required to adapt to the simultaneous test of different numbers of test pieces; the computer control system 16 can be installed on the workbench 1 through a rotating arm, and can also be arranged in a split mode in a single console mode; the test piece 17 is arranged on the test piece clamping mechanism 7 and clamped to prevent the test piece from shaking, inclining or rotating; the pressure loading head 6 performs a pressure cycle loading test on the test piece 17.
FIG. 4 is an example of a suitable furniture structure node test piece. The test piece 17 may be a two-dimensional joint, a three-dimensional joint, a two-dimensional curved piece, or the like, and may have a square, circular, oval, or the like cross section.
In the figure, 1 is a displacement sensor, 2 is a guide rod, 3 is a cylinder, 4 is a horizontal support, 5 is a tension and pressure sensor, 6 is a pressure loading head, 7 is a specimen clamping mechanism, 8 is a machine frame, 9 is a branch adjusting valve, 10 is a total pressure adjusting valve, 11 is a fixed platen, 12 is a vertical column, 13 is a horizontal support height adjusting screw, 14 is a support frame, 15 is a tension and pressure loading head, 16 is a computer control system, and 17 is a specimen.
Detailed Description
A furniture structure node bending fatigue strength testing device structurally comprises a workbench, a loading unit and a computer control system, wherein a stand column 12 and a test piece clamping mechanism 7 in the loading unit are respectively arranged on a fixed bedplate 11 in the workbench, and are respectively installed, adjusted and locked in position through a longitudinal dovetail groove rail or a transverse dovetail groove rail on the fixed bedplate 11, and clamping and loading of a test piece 17 are realized; a computer control system 16 is mounted on the table by means of a rotating arm for operating the loading unit.
The working table of the device is as follows: the automatic lifting device comprises a machine frame 8, a fixed bedplate 11 and a supporting frame 14, wherein the fixed bedplate 11 and the supporting frame 14 are installed on the machine frame 8.
The loading unit of the device: the device comprises a displacement sensor 1, a guide rod 2, a cylinder 3, a horizontal support 4, a tension pressure sensor 5, a pressure loading head 6 (or a tension pressure loading head 15), a test piece clamping mechanism 7, a stand column 12, a horizontal support height adjusting screw 13, a sub-adjusting valve 9 and a main pressure regulating valve 10, and is used for clamping and loading a furniture structure node test piece 17, wherein the displacement sensor 1, the guide rod 2, the cylinder 3 and the tension pressure sensor 5 are all arranged on the horizontal support 4; the horizontal bracket 4 is arranged on the upright post 12 and is adjusted in height through an adjusting screw 13; the upright post 12 and the test piece clamping mechanism 7 are respectively arranged on the fixed bedplate 11 and are respectively arranged, adjusted and locked through a longitudinal dovetail groove rail or a transverse dovetail groove rail on the fixed bedplate 11; the lower end of the tension and pressure sensor 5 can be connected with two pressure loading heads 6 or tension and pressure loading heads 15 which can be replaced and independently used in a locking manner, so that a pressurization cycle loading test and a one-pressure one-tension cycle loading test are respectively realized, and the tension and pressure sensor 5 is used for transmitting and feeding back data information of loading force; the cylinder 3 realizes the reciprocating linear sliding of the pressure loading head 6 or the tension pressure loading head 15; the displacement sensor 1 realizes the real-time feedback of the position of the pressure loading head 6 or the tension pressure loading head 15, so that the deformation or damage degree of the test piece can be conveniently recorded; the loading units can be 1 group or more, so as to adapt to the simultaneous test of different numbers of test pieces; the test specimen may be a two-dimensional joint or a three-dimensional joint, the cross-section of which may be square or circular or oval.
The computer control system 16 of the apparatus: the test bench comprises a computer display screen, control software, a signal amplifier, a data acquisition card and the like, is arranged on the workbench 1 through a rotating arm and is used for controlling a loading unit, realizing functions of inputting a loading mode, specifying a load, observing a sensor value, designing a shutdown mode, acquiring and processing test time and data and drawing a chart, and realizing accurate control and real-time monitoring of each test link by experimenters.
The test method comprises the following steps:
(1) mounting and clamping a test piece;
(2) installing and adjusting a loading head;
(3) setting a force value and carrying out cyclic loading;
(4) the loading test is automatically controlled and processed by a computer control system.
The step (1) is to install and clamp the test piece: determining the type and the test requirement of the furniture structure node to be tested, determining the loading position, mounting the furniture structure node test piece 17 to be tested on the test piece clamping mechanism 7, and clamping the test piece through a screw rod and a clamp on the test piece clamping mechanism 7 so as to prevent the test piece from shaking, inclining or rotating.
The step (2) of installing and adjusting the loading head: the height and the front and back positions of the horizontal bracket 4 are adjusted through the upright post 12 and the adjusting screw 13; installing a displacement sensor 1, a guide rod 2, a cylinder 3 and a tension and pressure sensor 5 at the specified position of a horizontal bracket 4; according to the test requirements of the pressurization cycle loading test or the one-pressure one-pull cycle loading test, the types of the pressure loading head 6 or the pull loading head 15 are respectively selected, the pressure loading head 6 or the pull loading head 15 is installed at the lower end of the pull pressure sensor 5 and locked, and the loading points of the pressure loading head 6 or the pull loading head 15 and the test piece 17 are kept at the specified positions of the same vertical line.
Setting a force value and carrying out cyclic loading in the step (3): the loading force is adjusted through a main pressure regulating valve 10, a sub-regulating valve 9 and a tension pressure sensor 5 according to the force value requirements set by a test loading mode, loading frequency, loading duration, test piece damage judgment standards and the like, the test piece 17 is loaded circularly, and the deformation displacement value and the test times are recorded by a displacement sensor 1 and a computer control system 16 respectively.
The loading test in the step (4) is automatically controlled and processed by a computer control system: the whole loading test process is automatically controlled, data processed, monitored and displayed in real time by the computer control system 16; the control system can calculate and output results, automatically output numerical values and draw corresponding charts according to the applied load in a preset output form; when the damage degree of the test piece 17 reaches the set damage degree, namely the deformation displacement value recorded by the displacement sensor 1 exceeds a certain range, or the test reaches the specified test times, the loading test can be automatically stopped.
Referring to fig. 1, which is a schematic view of a local structure of a furniture structure node bending fatigue strength testing device, a displacement sensor 1, a guide rod 2 and a cylinder 3 of a loading unit are all installed on a horizontal bracket 4; the horizontal bracket 4 is arranged on the upright post 12 and is adjusted in height through an adjusting screw 13; the upright post 12 and the test piece clamping mechanism 7 are respectively arranged on a fixed bedplate 11 of the workbench and are respectively installed, adjusted and locked in position through a longitudinal dovetail groove rail or a transverse dovetail groove rail on the fixed bedplate 11; the test piece clamping mechanism 7 is used for clamping a test piece 17; the upper end of a tension pressure sensor 5 is connected with the cylinder 3, and the lower end of the tension pressure sensor is connected with a pressure loading head 6 in a locking mode, so that a pressurization cycle loading test is realized, and the tension pressure sensor is used for conducting and feeding back data information of loading force; the loading units can be 1 group or more, so as to adapt to the simultaneous test of different numbers of test pieces; the branch regulating valve 9, the main pressure regulating valve 10, the fixed bedplate 11 and the supporting frame 14 are arranged on the machine frame 8.
Referring to fig. 2, the drawing and pressing force loading head 15 is a schematic structural diagram, and can be installed at the lower end of the drawing and pressing force sensor 5, and used separately from the pressing and pressing force loading head 6 instead, to respectively implement a one-pressing-one-drawing cyclic loading test and a pressing cyclic loading test.
Referring to fig. 3, the overall structure and the specimen mounting and clamping diagram of the present invention are shown. 1 or more groups of loading units can be configured as required to adapt to the simultaneous test of different numbers of test pieces; the computer control system 16 can be installed on the workbench 1 through a rotating arm, and can also be arranged in a split mode in a single console mode; the test piece 17 is arranged on the test piece clamping mechanism 7 and clamped to prevent the test piece from shaking, inclining or rotating; the pressure loading head 6 performs a pressure cycle loading test on the test piece 17.
Referring to fig. 4, which is an example of a suitable furniture structure node test piece, the test piece 17 may be a two-dimensional joint, a three-dimensional joint, a two-dimensional bending piece, or the like, and the cross section may be square, circular, oval, or the like.
Claims (3)
1. A test method using a furniture structure node bending fatigue strength test device is characterized by comprising the following steps: the furniture structure node bending fatigue strength testing device comprises a workbench, a loading unit and a computer control system, wherein an upright post and a test piece clamping mechanism in the loading unit are respectively arranged on a fixed bedplate in the workbench, and are respectively installed, adjusted and locked in position through a longitudinal or transverse dovetail groove rail on the fixed bedplate, and clamping and loading of a test piece are realized; the computer control system is arranged on the workbench through the rotating arm and used for controlling the loading unit, and the loading unit: the device comprises a displacement sensor, a guide rod, an air cylinder, a horizontal bracket, a tension pressure sensor, a pressure loading head or a tension pressure loading head, a test piece clamping mechanism, a stand column, a horizontal bracket height adjusting screw rod, a sub-adjusting valve and a main pressure adjusting valve, and is used for clamping and loading a furniture structure node test piece, wherein the displacement sensor, the guide rod, the air cylinder and the tension pressure sensor are all arranged on the horizontal bracket; the horizontal bracket is arranged on the upright post, and the height of the horizontal bracket is adjusted through an adjusting screw rod; the upright post and the test piece clamping mechanism are respectively arranged on the fixed bedplate and are respectively arranged, adjusted and locked by a longitudinal dovetail groove rail or a transverse dovetail groove rail on the fixed bedplate; the lower end of the tension pressure sensor is connected with two pressure loading heads or tension pressure loading heads which can be replaced and independently used in a locking manner, so that a pressurization cycle loading test and a one-pressure one-tension cycle loading test are respectively realized, and the tension pressure sensor is used for transmitting and feeding back data information of loading force; the cylinder realizes the reciprocating linear sliding of the pressure loading head or the pull pressure loading head; the displacement sensor realizes the real-time feedback of the position of the pressure loading head or the tension pressure loading head, and is convenient for recording the deformation or damage degree of the test piece; the loading units are 1 group or more so as to adapt to the simultaneous test of different numbers of test pieces; the test specimen is a two-dimensional joint or a three-dimensional joint, and the section of the test specimen is square, circular or oval; the device comprises a machine frame, a fixed bedplate and a support frame, wherein the fixed bedplate and the support frame are arranged on the machine frame; the computer control system: the system comprises a computer display screen, control software, a signal amplifier and a data acquisition card, wherein the computer display screen, the control software, the signal amplifier and the data acquisition card are arranged on a workbench through a rotating arm and are used for controlling a loading unit, so that functions of inputting a loading mode, specifying a load, observing a sensor value, designing a shutdown mode, acquiring and processing test time and data and drawing a chart are realized, and accurate control and real-time monitoring of each test link by experimenters are realized;
the testing method of the furniture structure node bending fatigue strength testing device comprises the following steps:
(1) mounting and clamping a test piece;
(2) installing and adjusting a loading head;
(3) setting a force value and carrying out cyclic loading, regulating the loading force through a main pressure regulating valve, a sub-regulating valve and a tension pressure sensor according to the force value requirement set by a test loading mode, loading frequency, loading duration and a test piece damage judgment standard, carrying out cyclic loading on the test piece, and respectively recording the deformation displacement value and the test times by a displacement sensor and a computer control system;
(4) the loading test is automatically controlled and processed by the computer control system, and the whole loading test process is automatically controlled, data processed, monitored in real time and displayed in real time by the computer control system; the control system can calculate and output results, automatically output numerical values and draw corresponding charts according to the applied load in a preset output form; when the damage degree of the test piece reaches the set damage degree, namely the deformation displacement value recorded by the displacement sensor exceeds the specified range, or the test reaches the specified test times, the loading test can be automatically stopped; the testing method using the furniture structure node bending fatigue strength testing device is applied to testing the bending fatigue strength and the durability of the furniture structure node component under compression or compression tensile load.
2. The test method of the furniture structure node bending fatigue strength test device according to claim 1, characterized in that the step (1) of mounting and clamping the test piece: determining the type and the test requirement of a furniture structure node to be tested, determining a loading position, mounting a furniture structure node test piece to be tested on a test piece clamping mechanism, and clamping the test piece through a screw rod and a clamp on the test piece clamping mechanism to prevent the test piece from shaking, inclining or rotating.
3. The furniture structure node bending fatigue strength testing device testing method according to claim 1, wherein the step (2) of installing and adjusting the loading head: the height and the front and back positions of the horizontal bracket are adjusted through the upright post and the adjusting screw rod; installing a displacement sensor, a guide rod, a cylinder and a tension and pressure sensor at the specified position of a horizontal bracket; and respectively selecting the type of the pressure loading head or the pull loading head according to the test requirements of the pressurization cycle loading test or the one-pressure one-pull cycle loading test, mounting the pressure loading head or the pull loading head at the lower end of the pull pressure sensor, locking the pressure loading head or the pull loading head, and keeping the loading points of the pressure loading head or the pull loading head and the test piece at the specified position of the same vertical line.
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| CN201610903337.2A CN106441968B (en) | 2016-10-18 | 2016-10-18 | Furniture structure node bending fatigue strength testing device and testing method |
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| CN201610903337.2A CN106441968B (en) | 2016-10-18 | 2016-10-18 | Furniture structure node bending fatigue strength testing device and testing method |
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| CN106441968B true CN106441968B (en) | 2020-01-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106989941A (en) * | 2017-03-30 | 2017-07-28 | 中车青岛四方车辆研究所有限公司 | Car lifting J-Horner lift unit load test TT＆C system and method |
| CN113640159B (en) * | 2021-08-24 | 2023-11-10 | 安徽省汉博科技有限公司 | Fatigue strength testing device for furniture node connection part |
| CN113640030B (en) * | 2021-08-25 | 2023-11-14 | 安徽省汉博科技有限公司 | Intensity testing device and method for furniture |
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| US9395288B2 (en) * | 2012-10-10 | 2016-07-19 | Colgate Mattress Atlanta Corporation | Mattress testing apparatus and method |
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| CN101446523A (en) * | 2008-11-12 | 2009-06-03 | 陶泽成 | Computer module comprehensive testing machine for controlling furniture |
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Application publication date: 20170222 Assignee: Shanghai Kuanhong Metal Products Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020980008964 Denomination of invention: A device and method for testing bending fatigue strength of furniture structural joints Granted publication date: 20200110 License type: Common License Record date: 20201209 Application publication date: 20170222 Assignee: Shanghai Baiheng Office Furniture Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020980008922 Denomination of invention: A device and method for testing bending fatigue strength of furniture structural joints Granted publication date: 20200110 License type: Common License Record date: 20201207 |
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Effective date of registration: 20211208 Address after: 210000 floor 6, block a, Kechuang building, Huizhi Industrial Park, Lishui Economic Development Zone, Nanjing, Jiangsu Province Patentee after: Nanjing moqiao Technology Development Co.,Ltd. Address before: Nanjing City, Jiangsu province 210037 Longpan Road No. 159 Patentee before: NANJING FORESTRY University |
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