CN116223362A - System and method for testing connection friction coefficient of wood material - Google Patents
System and method for testing connection friction coefficient of wood material Download PDFInfo
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- CN116223362A CN116223362A CN202310203438.9A CN202310203438A CN116223362A CN 116223362 A CN116223362 A CN 116223362A CN 202310203438 A CN202310203438 A CN 202310203438A CN 116223362 A CN116223362 A CN 116223362A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention provides a system and a method for testing the connection friction coefficient of a wood material, wherein the testing system comprises the following steps: the device comprises a base, a supporting platform, a movable platform, a pull shaft, a translation mechanism, a force measuring device, a force application mechanism and a pressure application mechanism, wherein the supporting platform is used for installing and fixing a sample and is fixed on the base; the movable platform is movably arranged on the base, one end of the pull shaft is arranged on the movable platform, the other end of the pull shaft is connected with the force applying mechanism through the force measuring device, the force applying mechanism is used for transmitting tensile force to the movable sample on the fixed sample, the translation mechanism is connected with the movable platform to provide acting force for driving the movable sample to move relative to the fixed sample, accurate reduction of the wood connecting state to be measured is achieved, the friction coefficient of different types of wood connecting interfaces is accurately measured, and particularly, the technical problem that the measurement accuracy of the friction coefficient of different types of connection of wood materials is poor is solved for the connecting interfaces of irregular wood samples.
Description
Technical Field
The invention relates to the technical field of wood property testing, in particular to a system and a method for testing the connection friction coefficient of a wood material.
Background
The friction coefficient refers to the ratio of the friction force between two surfaces to the vertical force acting on one surface thereof, and is related to the roughness of the surface, and is independent of the size of the contact area, and can be classified into a dynamic friction coefficient and a static friction coefficient according to the nature of movement; sliding friction is generated by the relative sliding of two objects in contact with each other.
The wood interface friction refers to the action of friction resistance generated by the relative movement of the contact surface between the wood, and the interface friction performance is an important index and basis for evaluating the stability and the earthquake resistance of the traditional ancient building wood structure and the modern wood structure building structure. Therefore, the method accurately simulates the friction state of the wood interface, and accurately measures the friction coefficient of the wood connecting interface of different connecting types, thereby having an important effect on the stability evaluation of the wood structure building.
At present, a friction coefficient of a high polymer material is usually tested by adopting a mode of friction between two samples or friction between the samples and other materials, fixing the samples on a horizontal experiment table by using a double-sided adhesive tape, fixing another sample or other materials on the lower surface of a sliding block by using the double-sided adhesive tape, and then sliding the sliding block on the experiment table. However, wood is used as an anisotropic elastoplastic material, has complex physical and chemical properties, and the friction performance of a wood connecting interface is related to various factors such as wood grain direction, surface damage degree, load action and the like. Therefore, the interface friction mechanism of the wood is different from that of the conventional polymer film material test, and the connection state of the friction interface of the wood material cannot be accurately simulated by adopting the conventional mode, so that the test accuracy is affected. In conclusion, for the measurement of the connection friction coefficient of the wood material, the technical problems of imperfect measurement facilities, poor measurement accuracy and inconvenient operation exist.
Disclosure of Invention
The invention aims to provide a system and a method for testing the connection friction coefficient of a wood material, which are used for accurately reducing the connection state of the wood and solving the technical problem of poor measurement accuracy of the friction coefficient of the wood material.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a system for testing the connection friction coefficient of a wood material, which comprises the following components: the device comprises a base, a supporting platform, a movable platform, a pull shaft, a translation mechanism, a force measuring device, a force application mechanism and a pressure application mechanism, wherein the supporting platform is used for installing and fixing a sample and is fixed on the base;
the movable platform is movably arranged on the base, one end of the pull shaft is arranged on the movable platform, the other end of the pull shaft is connected with the force applying mechanism through the force measuring device, the force applying mechanism is used for transmitting tensile force to a movable sample on the fixed sample, and the translation mechanism is connected with the movable platform to provide acting force for driving the movable sample to move relative to the fixed sample.
In a preferred embodiment, the pull shaft is a static friction pull shaft, and the wood material connection friction coefficient testing system comprises a spring mounted to the static friction pull shaft.
In a preferred embodiment, the wood material connection friction coefficient testing system comprises a lifting workbench, wherein the movable platform is mounted on the lifting workbench, and the lifting workbench is used for driving the movable platform to move up and down.
In a preferred embodiment, the force measuring device is provided with a level bar.
In a preferred embodiment, the translation mechanism comprises a transmission servo motor, a ball screw and a moving slide block, the lifting workbench is mounted on the moving slide block, and the movable platform is mounted on the lifting workbench 13.
In a preferred embodiment, the support platform comprises a sample mounting plate, and a fixed stop pin is arranged on the sample mounting plate and used for limiting a fixed sample.
In a preferred embodiment, the force applying mechanism comprises a pull strap for attaching the movable specimen.
In a preferred embodiment, the pressing mechanism includes a weight provided on the movable specimen.
In a preferred embodiment, the pressure applying mechanism comprises a high pressure load bearing air cushion for applying pressure to the moving specimen and measuring the magnitude of the pressure by a pressure sensor.
In a preferred embodiment, the pull shaft is a dynamic friction pull shaft, and the wood material connection friction coefficient testing system further comprises a displacement sensor, and the displacement sensor is mounted on the supporting platform.
The invention provides a method for testing the connection friction coefficient of a wood material, which adopts the system for testing the connection friction coefficient of the wood material, and comprises the following steps:
the pressing mechanism applies load to the movable sample and the fixed sample to be tested;
the force measuring device records the acting force in the test process.
The invention has the characteristics and advantages that:
the pressure applying mechanism simulates the applied load of the movable sample and the fixed sample to be tested, the translation mechanism provides acting force for the movable sample to drive the movable sample to move relative to the fixed sample through the force applying mechanism, and the force measuring device records the acting force in the testing process, so that the friction coefficient of the surfaces to be tested of the movable sample and the fixed sample is calculated, and the friction coefficient measurement accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an isometric view of an embodiment of a system for testing coefficient of friction of a wood material joint according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a front view of a further embodiment of a system for testing the coefficient of friction of a wood material joint according to the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic view of the installation of a test specimen in a system for testing the coefficient of friction of a wood material connection provided by the present invention;
fig. 6 is a schematic view of the installation of a fixed specimen.
Reference numerals illustrate:
90. a force application mechanism; 9. binding bands; 10. a level bar;
100. a force measuring device; 1. a tension sensor;
17. static friction pull shaft; 18. a spring;
20. a dynamic friction pull shaft; 4. a displacement sensor;
2. a cover plate strut; 3. a cover plate;
60. a pressing mechanism; 6. a counterweight; 7. fixing a stop pin;
110. a movable platform; 11. a pull shaft fixing seat;
120. a translation mechanism; 12. moving the slide block; 15. a transmission servo motor; 16. a ball screw;
13. lifting the workbench; 14. a base;
190. a support platform; 19. a sample mounting plate;
21. a pressure sensor; 22. high-pressure bearing air cushion;
5. fixing the sample; 8. a movable sample;
23. irregularly fixing the sample; 24. irregular moving specimens.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Scheme one
The invention provides a system for testing the connection friction coefficient of a wood material, which is shown in figures 1-5 and comprises the following components: the device comprises a base 14, a supporting platform 190, a movable platform 110, a pull shaft, a translation mechanism 120, a force measuring device 100, a force application mechanism 90 and a pressure application mechanism 60, wherein the supporting platform 190 is used for installing a fixed sample, and the supporting platform 190 is fixed on the base; the movable platform 110 is movably mounted on the base, one end of the pull shaft is mounted on the movable platform 110, the other end of the pull shaft is connected with the force applying mechanism 90 through the force measuring device 100, the force applying mechanism 90 is used for transmitting a tensile force to a movable sample on the fixed sample, and the translation mechanism 120 is connected with the movable platform 110 to provide an acting force for driving the movable sample to move relative to the fixed sample.
In the test system, the pressing mechanism 60 applies load to the movable sample and the fixed sample to be tested, the translation mechanism 120 provides acting force for driving the movable sample to move relative to the fixed sample through the force application mechanism 90, and the force measuring device 100 records the acting force in the test process, so that the friction coefficient of the surfaces to be tested of the movable sample and the fixed sample is calculated, and the measurement accuracy of the friction coefficient is improved.
The base 14 is used to secure and support the entire coefficient of friction testing system, and the base 14 may be disposed horizontally. In one embodiment, the pull shaft is a static friction pull shaft 17.
Further, the test system further comprises a spring 18, as shown in fig. 2, the spring 18 is mounted on the static friction pull shaft 17 and fixed on the movable platform 110. Specifically, the movable platform 110 is provided with a pull shaft fixing seat 11 for connecting a pull shaft.
In an embodiment, the test system includes a lifting platform, the movable platform 110 is mounted on the lifting platform, and the lifting platform is used for driving the movable platform 110 to move up and down so as to adjust the vertical position of the movable platform. Specifically, the movable platform 110 is fixed to the elevating table 13 by bolting.
Further, a leveling bar is provided on the force measuring device 100, and as shown in fig. 2, a leveling instruction is given by the leveling bar 10, and the height of the lifting table is adjusted so that the tensile force transmitted by the force applying mechanism 90 is maintained horizontal.
The support platform 190 comprises a sample mounting plate 19, a fixed stop pin 7 is arranged on the sample mounting plate 19, and the fixed sample 5 is horizontally arranged on the sample mounting plate 19 and is limited and fixed by the fixed stop pin 7. The fixed sample to be measured can also be fixed by threads.
In one embodiment, the force application mechanism 90 comprises a pulling binding belt 9, the pressure application mechanism 60 comprises a counterweight 6, the counterweight 6 is horizontally placed on the movable sample 8 and connected with the binding belt 9, the vertical load adding is carried out on the to-be-tested piece, and the static friction pulling shaft 17 is connected with the pulling hook of the pulled binding belt 9 through the pulling force sensor 1. The counterweight 6 can increase the fixed load.
In an embodiment, the translation mechanism 120 includes a transmission servo motor 15, a ball screw 16, and a moving slide 12, where the transmission servo motor 15 provides power to drive the moving slide 12 to move along the longitudinal direction of the ball screw 16, so as to drive the movable platform 110 to translate. Specifically, the lifting workbench 13 is mounted on the movable slide block 12, the movable platform 110 is mounted on the lifting workbench 13, power provided by the servo motor 15 is transmitted to the movable slide block 12 through the ball screw 16, the movable platform 110 and the movable test piece are driven to axially move through the lifting workbench 13, and the test is completed by recording the data of the tension sensor 1.
In other embodiments, as shown in fig. 3 and 4, the pull shaft is a dynamic friction pull shaft 20, the test system further comprises a displacement sensor, and when the test is performed, the data such as the sliding distance and time of the tested sample are recorded through the displacement sensor 4, the data of the pull sensor and the displacement sensor are recorded, and the friction coefficient of the surface to be tested is calculated.
In other embodiments, the fixed sample is an irregular fixed sample 23, as shown in fig. 5 and 6, the pressing mechanism 60 comprises a high-pressure bearing air cushion 22, fixed stop pins 7 with different sizes are customized according to the actual shape of the irregular fixed sample 23, and for the appearance characteristics of the irregular movable sample 24, the high-pressure bearing air cushion 22 is injected with gas to form reaction force with a cover plate, and the pressure is determined by the data of the pressure sensor 21, so that the pressure is applied to the irregular movable sample 24.
The wood material connection friction coefficient testing system provided by the invention can accurately restore the wood connection state to be tested, accurately measure the friction coefficient of different types of wood connection interfaces, and particularly solve the technical problem of poor measurement accuracy of the friction coefficient of different connection types of wood materials aiming at the connection interfaces of irregular wood samples. During testing, the pressing mechanism 60 with two modes of fixed load and high-pressure bearing air cushion 22 is provided, the movable sample and the fixed sample to be tested can be simulated and applied with load according to the actual compression state of the appointed connecting structure, and the force application mechanism 90 can carry out closed-loop control on the transmission servo motor 15 through the displacement sensor 4 and the tension sensor 1, so that the test of the dynamic/static friction coefficient of the wood connecting interface under different test conditions such as translation speed, tension and the like is satisfied. The translation mechanism 120 provides acting force for the movable sample to drive the movable sample to move relative to the fixed sample, the force measuring device 100 can record the acting force in the test process in real time, so that the friction coefficient of the surface to be tested of the movable sample and the fixed sample is calculated, the measurement accuracy of the friction coefficient is improved, meanwhile, the force measuring device 100 and the displacement sensor 4 can record dynamic data of the test process, and data support is provided for further test research in later period.
Scheme II
The invention provides a method for testing the connection friction coefficient of a wood material, which adopts the system for testing the connection friction coefficient of the wood material, and comprises the following steps: the pressing mechanism 60 applies a load to the movable specimen and the fixed specimen to be measured; through the force application mechanism 90, the translation mechanism 120 provides a force to the movable sample for urging it to move relative to the fixed sample; the force measuring device 100 records the amount of force during the test. The friction coefficient of the surface to be tested of the movable sample and the fixed sample can be calculated through the data obtained by the testing method for the connection friction coefficient of the wooden material, and the testing method has the technical characteristics and the beneficial effects of the testing system and is not repeated herein.
Further, the test method comprises: the pressing mechanism 60 applies a specified load to the movable sample and the fixed sample to be tested according to the connection working condition of the tested sample; the force application mechanism 90 performs closed-loop control on the transmission servo motor 15 through the displacement sensor 4 and the tension sensor 1, and provides a specified translation speed or a specified tension force for the test system through the transmission servo motor 15; the force measuring device 100 records the magnitude of the applied force during the test; the displacement sensor 4 records the change relation between displacement and time in the test process.
The foregoing is merely a few embodiments of the present invention and those skilled in the art may make various modifications or alterations to the embodiments of the present invention in light of the disclosure herein without departing from the spirit and scope of the invention.
Claims (10)
1. A system for testing the coefficient of friction of a wood material joint, comprising: the device comprises a base, a supporting platform, a movable platform, a pull shaft, a translation mechanism, a force measuring device, a force application mechanism and a pressure application mechanism, wherein the supporting platform is used for installing and fixing a sample and is fixed on the base;
the movable platform is movably arranged on the base, one end of the pull shaft is arranged on the movable platform, the other end of the pull shaft is connected with the force applying mechanism through the force measuring device, the force applying mechanism is used for transmitting tensile force to a movable sample on the fixed sample, and the translation mechanism is connected with the movable platform to provide acting force for driving the movable sample to move relative to the fixed sample.
2. The system for testing the connection friction coefficient of a wood material according to claim 1, wherein,
the pull shaft is a static friction pull shaft, and the wood material connection friction coefficient testing system comprises a spring which is arranged on the static friction pull shaft.
3. The system for testing the connection friction coefficient of a wood material according to claim 1, wherein,
the wood material connection friction coefficient testing system comprises a lifting workbench, wherein the movable platform is arranged on the lifting workbench, and the lifting workbench is used for driving the movable platform to move up and down.
4. The system for testing the connection friction coefficient of a wood material according to claim 3,
and a level bar is arranged on the force measuring device.
5. The system for testing the connection friction coefficient of a wood material according to claim 3,
the translation mechanism comprises a transmission servo motor, a ball screw and a movable sliding block, the lifting workbench is arranged on the movable sliding block, and the movable platform is arranged on the lifting workbench 13.
6. The system for testing the connection friction coefficient of a wood material according to claim 1, wherein,
the supporting platform comprises a sample mounting plate, wherein a fixed stop pin is arranged on the sample mounting plate and used for limiting a fixed sample.
7. The system for testing the connection friction coefficient of a wood material according to claim 1, wherein,
the force application mechanism comprises a pulling and binding belt which is used for connecting the movable sample;
the pressing mechanism comprises a counterweight arranged on the movable sample.
8. The system for testing the connection friction coefficient of a wood material according to claim 1, wherein,
the pressure applying mechanism comprises a high-pressure bearing air cushion, and the high-pressure bearing air cushion is used for applying pressure to the movable sample and measuring the pressure through a pressure sensor.
9. The system for testing the connection friction coefficient of a wood material according to claim 1, wherein,
the pull shaft is a dynamic friction pull shaft, and the wood material connection friction coefficient testing system further comprises a displacement sensor which is arranged on the supporting platform.
10. A method for testing the connection friction coefficient of a wood material, characterized in that the system for testing the connection friction coefficient of a wood material according to any one of claims 1 to 9 is used, the method comprising:
the pressing mechanism applies load to the movable sample and the fixed sample to be tested;
the translation mechanism provides acting force for the movable sample to drive the movable sample to move relative to the fixed sample through the force application mechanism;
the force measuring device records the acting force in the test process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310203438.9A CN116223362A (en) | 2023-03-06 | 2023-03-06 | System and method for testing connection friction coefficient of wood material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310203438.9A CN116223362A (en) | 2023-03-06 | 2023-03-06 | System and method for testing connection friction coefficient of wood material |
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| Publication Number | Publication Date |
|---|---|
| CN116223362A true CN116223362A (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310203438.9A Pending CN116223362A (en) | 2023-03-06 | 2023-03-06 | System and method for testing connection friction coefficient of wood material |
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| CN (1) | CN116223362A (en) |
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- 2023-03-06 CN CN202310203438.9A patent/CN116223362A/en active Pending
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