CN109459322B - Precise humanoid rod pure bending moment experimental device - Google Patents
Precise humanoid rod pure bending moment experimental device Download PDFInfo
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- CN109459322B CN109459322B CN201811509951.6A CN201811509951A CN109459322B CN 109459322 B CN109459322 B CN 109459322B CN 201811509951 A CN201811509951 A CN 201811509951A CN 109459322 B CN109459322 B CN 109459322B
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- 238000005452 bending Methods 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Gears, Cams (AREA)
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a precise herringbone rod pure bending moment experimental device, wherein a clamping end on the left side of the device can axially move along the horizontal direction through a double-row guide rail; the right clamping end adopts the worm gear and the worm which are the same as the left clamping end to realize the rotation around the vertical direction. And the hand wheel connected with the worms on the two sides of the clamping end realizes power input and drives the worm wheel and the worm to rotate. The fixing device realizes the fixing of the human-shaped rods with different sizes through the waist-shaped holes on the L-shaped plates of the human-shaped rod clamping ends. And the bending moment and the angle of the humanoid rod in the bending process are respectively subjected to data acquisition through the moment sensor and the angle sensor. The angle sensor and the moment sensor with the same model are respectively adopted at the two ends of the invention, so that the symmetrical deformation of the human-shaped rod only generates bending and does not have torsion in the measuring process, thereby more precisely acquiring data. The invention provides a theoretical basis for the research on the mechanical property of the humanoid rod in the pure bending process and the application of the humanoid rod in the actual engineering.
Description
Technical Field
The invention relates to a pure bending moment experimental device for a precise herringbone rod, and belongs to the technical field of super-elastic extension rods in a space foldable and expandable mechanism.
Background
The herringbone rod is a thin-wall cylindrical shell similar to a strip spring, and the cross section of the herringbone rod is similar to the shape of a Chinese character 'ren'. The cross section of the human-shaped rod can be flattened and wound around the cylindrical roller, so that the human-shaped rod can be folded and can be unfolded by means of elastic deformation of the human-shaped rod. In 2011, the first solar sail deployed by NASA in space used a herringbone stick. The human-shaped rod has the characteristics of light weight, high folding ratio, high rigidity, high strength and self-unfolding, and is manufactured by two strip springs through a special process. Although the two strip springs constituting the human-shaped bar have a simple structure, the mechanical properties of the human-shaped bar are complicated and nonlinear. Therefore, the full understanding of the mechanical properties of the humanoid rod is helpful for the application of the humanoid rod in practical engineering. In 2017, two scientists in the united states used non-contact photography to measure the angle at which a human-shaped rod bends when pure bending occurs, which is simple and intuitive, but has large measurement errors. The invention adopts the potentiometer to precisely collect the bending angle of the human-shaped rod.
Disclosure of Invention
The invention aims to accurately measure each parameter of the humanoid rod in a bending experiment, provides a theoretical basis for the application of the humanoid rod in actual work, and further provides a precise humanoid rod pure bending moment experimental device.
The technical scheme adopted by the invention is as follows: a precise humanoid rod pure bending moment experiment device comprises a worm gear and worm transmission device, a clamping device, an angle and moment data acquisition device and an auxiliary supporting device, wherein the worm gear and worm transmission device comprises a worm, a worm gear shaft, a movable Z-shaped plate, a first bearing, a sleeve, a positioning pin, a hand wheel, a fixed Z-shaped plate, a second bearing, a third bearing and a clamp spring; the clamping device comprises an upper pressure plate, a lower supporting plate, an L-shaped plate and an inner hexagon screw; the angle and torque data acquisition device comprises a potentiometer, a connecting block, a torque sensor, a coupler, a U-shaped plate and a set screw; the auxiliary supporting device comprises a bearing seat, a bearing plate, a sliding block, a guide rail, a C-shaped seat and a bottom plate; the worm wheel is meshed with the worm, and the worm wheel is connected with a worm wheel shaft through a flat key; the worm wheel shaft and the sleeve are fixed through a positioning pin; the sleeve is arranged on an L-shaped plate of the clamping device through a bolt; the first bearing is fixed in a hole reserved in the movable Z-shaped plate through a sleeve; the movable Z-shaped plate is fixed on the bearing plate through a bolt; the first bearing is fixed in a hole reserved in the fixed Z-shaped plate through a sleeve; the fixed Z-shaped plate is arranged on the bearing plate through a bolt; the second bearing is fixed in a hole reserved in the bearing plate through a shaft shoulder of the worm wheel shaft; the third bearing is fixed in a hole reserved in the bearing seat through a clamp spring; the potentiometer is arranged on the connecting block through a bolt; the connecting block is arranged on the bearing block through a bolt; the bearing block is arranged on the bearing plate through a bolt; one end of the torque sensor is fixed on the U-shaped plate through a D-shaped head, and the other end of the torque sensor is installed on the coupler through a set screw; the coupling is arranged on a worm wheel shaft through a bolt; the U-shaped plate is arranged on the bearing plate through bolts; the sliding block is arranged on the bearing plate through a bolt; the guide rail is arranged on the bottom plate through a bolt; the bearing plate is mounted on the C-shaped seat through bolts; the C-shaped seat is installed on the bottom plate through bolts.
The worm gear and worm transmission device realizes large-transmission-ratio speed reduction through a worm wheel and a worm.
The clamping device can clamp the human-shaped rods with different sizes by adjusting the distance between the upper pressure plate and the lower supporting plate.
The angle and moment data acquisition device can respectively realize the measurement of the angle and the moment of the humanoid rod when the humanoid rod is subjected to pure bending deformation through the potentiometer and the moment sensor.
The angle and moment data acquisition device adopts two pairs of identical potentiometers and moment sensors to ensure that the angles rotated by the two ends of the humanoid rod relative to the central axis are identical and the moments received by the two ends of the humanoid rod are identical, so that the humanoid rod is ensured to be only bent but not twisted.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts the worm gear and worm transmission device to realize larger reduction ratio, the interval of the bending angles of the humanoid rod which can be measured is smaller, and meanwhile, the adjustability of the clamping end enables the humanoid rod with different section sizes to be tested.
(2) According to the invention, the torque sensor and the angle sensor are arranged at both the two clamping ends, and effective data is acquired once when the readings of the sensors at both ends of any measuring angle are the same, so that the humanoid rod can be ensured to be bent without being twisted, and the accuracy is greatly improved.
Drawings
FIG. 1 is a schematic perspective view (view one) of the overall structure of a precise man-shaped rod pure bending moment experimental device according to the present invention;
FIG. 2 is a schematic perspective view (viewing angle two) of the overall structure of a precise herringbone rod pure bending moment experimental device of the present invention;
figure 3 is a cross-sectional view of a chevron-shaped rod.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The first embodiment is as follows: an embodiment of the apparatus of the present invention will be described with reference to fig. 2. The present embodiment is a mechanism including: the device comprises a worm gear transmission device 1, a clamping device 2, an angle and moment data acquisition device 3 and an auxiliary supporting device 4;
the worm and gear transmission device 1 comprises a worm 101, a worm gear 102, a worm gear shaft 103, a movable Z-shaped plate 104, a first bearing, a sleeve 106, a positioning pin 107, a hand wheel 108, a fixed Z-shaped plate 109, a second bearing, a third bearing and a clamp spring;
the clamping device 2 comprises an upper pressure plate 201, a lower supporting plate 202, an L-shaped plate 203 and an inner hexagon screw 204;
the angle and torque data acquisition device comprises a potentiometer 301, a connecting block 302, a torque sensor 303, a coupler 304, a U-shaped plate 305 and a set screw 306;
the auxiliary supporting device comprises a bearing seat 401, a bearing plate 402, a sliding block 403, a guide rail 404, a C-shaped seat 405 and a bottom plate 406;
the worm wheel 102 is meshed with the worm 101, and the worm wheel 102 is connected with a worm wheel shaft 103 through a flat key; the worm gear shaft 103 and the sleeve 106 are fixed through a positioning pin 107; the sleeve 106 is mounted on the L-shaped plate 203 of the clamping device 2 through bolts; the first bearing is fixed in a hole reserved in the movable Z-shaped plate 104 through a sleeve 106; the movable Z-shaped plate 104 is fixed on the bearing plate 402 through bolts, and the first bearing is fixed in a hole reserved in the fixed Z-shaped plate 109 through a sleeve 106; the fixed Z-shaped plate 109 is installed on the bearing plate 402 through bolts; the second bearing is fixed in a hole reserved in the bearing plate 402 through a shaft shoulder of the worm gear shaft 103; the third bearing is fixed in a hole reserved in the bearing block 401 through a clamp spring; the potentiometer 301 is installed on a connecting block 302 through a bolt; the connecting block 302 is mounted on a bearing block 401 through a bolt; the bearing seat 401 is mounted on the bearing plate 402 through bolts; one end of the torque sensor 303 is fixed on the U-shaped plate 305 through a D-shaped head, and the other end of the torque sensor is installed on the coupling 304 through a set screw 306; the coupling 304 is mounted on the worm gear shaft 103 through bolts; the U-shaped plate 305 is installed on the bearing plate 402 through bolts; the sliding block 403 is mounted on the bearing plate 402 through bolts; the guide rails 404 are mounted on the base plate 406 by bolts; the bearing plate 402 is mounted on the C-shaped seat 405 through bolts; the C-shaped seat 405 is mounted on the base plate 406 by bolts.
The second embodiment is as follows: the worm gear 1 realizes large-ratio speed reduction through the worm wheel 102 and the worm 101.
The third concrete implementation mode: the clamping device 2 can realize clamping of human-shaped rods with different sizes by adjusting the distance between the upper pressing plate 201 and the lower supporting plate 202.
The fourth concrete implementation mode: the clamping device 2 can realize bending at different angles through the movement of the sliding block 403.
The fifth concrete implementation mode: the angle and torque data acquisition device 3 performs angle measurement by means of a potentiometer 301.
The sixth specific implementation mode: the angle and torque data acquisition device 3 performs torque measurement by the torque sensor 303.
The working principle is as follows (see fig. 1-2):
the measuring mechanism consists of a worm gear and worm transmission device 1, a clamping device 2, an angle and moment data acquisition device 3 and an auxiliary supporting device 4, and can complete the measurement of the bending of the humanoid rod and related data.
The worm gear and worm transmission device can convert the rotary motion around the horizontal shaft into the rotary motion of the clamping end around the vertical axis, so that the movement direction is changed by 90 degrees, and the two ends of the humanoid rod are bent simultaneously; through the worm gear, 1: and the reduction ratio of 30 is adopted, so that the measurement data are more accurate. One side of the worm is provided with a potentiometer. The angle of the worm can be measured through a potentiometer, and then the angle is converted into the angle of the bending of the man-shaped rod. The bottom of the worm shaft is provided with a torque sensor. The moment acting on the worm shaft can be measured through the moment sensor, and then the moment is converted into the bending moment borne by the man-shaped rod.
Claims (2)
1. The utility model provides a pure bending moment experimental apparatus of accurate humanoid pole, includes worm gear transmission (1), clamping device (2), angle and moment data acquisition device (3) and auxiliary stay device (4), its characterized in that: the worm and gear transmission device (1) comprises a worm (101), a worm gear (102), a worm gear shaft (103), a movable Z-shaped plate (104), a first bearing, a sleeve (106), a positioning pin (107), a hand wheel (108), a fixed Z-shaped plate (109), a second bearing, a third bearing and a clamp spring; the clamping device (2) comprises an upper pressing plate (201), a lower supporting plate (202), an L-shaped plate (203) and an inner hexagon screw (204); the angle and torque data acquisition device (3) comprises a potentiometer (301), a connecting block (302), a torque sensor (303), a coupler (304), a U-shaped plate (305) and a set screw (306); the auxiliary supporting device (4) comprises a bearing seat (401), a bearing plate (402), a sliding block (403), a guide rail (404), a C-shaped seat (405) and a bottom plate (406); the worm wheel (102) is meshed with the worm (101), and the worm wheel (102) is connected with a worm wheel shaft (103) through a flat key; the worm wheel shaft (103) and the sleeve (106) are fixed through a positioning pin (107); the sleeve (106) is arranged on an L-shaped plate (203) of the clamping device (2) through a bolt; the first bearing is fixed in a hole reserved in the movable Z-shaped plate (104) through a sleeve (106); the movable Z-shaped plate (104) is fixed on the bearing plate (402) through bolts; the first bearing is fixed in a hole reserved in the fixed Z-shaped plate (109) through a sleeve (106); the fixed Z-shaped plate (109) is mounted on the bearing plate (402) through bolts; the second bearing is fixed in a hole reserved in the bearing plate (402) through a shaft shoulder of the worm wheel shaft (103); the third bearing is fixed in a hole reserved in the bearing block (401) through a clamp spring; the potentiometer (301) is installed on the connecting block (302) through a bolt; the connecting block (302) is mounted on the bearing block (401) through a bolt; the bearing seat (401) is installed on the bearing plate (402) through a bolt; one end of the torque sensor (303) is fixed on the U-shaped plate (305) through a D-shaped head, and the other end of the torque sensor is installed on the coupler (304) through a set screw (306); the coupling (304) is mounted on the worm wheel shaft (103) through a bolt; the U-shaped plate (305) is installed on the bearing plate (402) through bolts; the sliding block (403) is installed on the bearing plate (402) through a bolt; the guide rail (404) is mounted on the bottom plate (406) through bolts; the bearing plate (402) is installed on the C-shaped seat (405) through bolts; the C-shaped seat (405) is installed on the bottom plate (406) through bolts;
the clamping device (2) can clamp the human-shaped rods with different sizes by adjusting the distance between the upper pressure plate (201) and the lower supporting plate (202);
the angle and moment data acquisition device (3) can respectively acquire angle and moment data of the humanoid pole during bending through a potentiometer (301) and a moment sensor (303);
the angle and moment data acquisition device (3) adopts two pairs of potentiometers (301) and moment sensors (303) with the same model number to ensure that the angles and moments rotated by the two ends of the humanoid rod relative to the central axis are respectively the same, and further ensure that the humanoid rod is only bent and is not twisted.
2. The precise herringbone rod pure bending moment experimental device of claim 1, which is characterized in that: the worm gear and worm transmission device (1) realizes large-transmission-ratio speed reduction through a worm wheel (102) and a worm (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811509951.6A CN109459322B (en) | 2018-12-11 | 2018-12-11 | Precise humanoid rod pure bending moment experimental device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811509951.6A CN109459322B (en) | 2018-12-11 | 2018-12-11 | Precise humanoid rod pure bending moment experimental device |
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| CN109459322A CN109459322A (en) | 2019-03-12 |
| CN109459322B true CN109459322B (en) | 2021-02-05 |
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| CN201811509951.6A Expired - Fee Related CN109459322B (en) | 2018-12-11 | 2018-12-11 | Precise humanoid rod pure bending moment experimental device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356594B (en) * | 2019-05-22 | 2022-11-29 | 四川航天神坤科技有限公司 | Elastic moment simulator |
| CN110108577B (en) * | 2019-05-28 | 2021-11-19 | 中国航空发动机研究院 | Axial bending loading device for thin-wall structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19645334B4 (en) * | 1996-11-04 | 2004-01-22 | Kunststoff-Zentrum in Leipzig gemeinnützige Gesellschaft mbH | Method and device for testing the kink stability |
| KR100929439B1 (en) * | 2006-12-26 | 2009-12-03 | 한국철도기술연구원 | Cable Torsion Tester |
| CN205898587U (en) * | 2016-08-17 | 2017-01-18 | 上海新高桥凝诚建设工程检测有限公司 | Steel tube bending test device |
| CN206868864U (en) * | 2017-07-03 | 2018-01-12 | 苏州大学应用技术学院 | A kind of bending apparatus of massage armchair backboard |
| CN108839823B (en) * | 2018-07-09 | 2021-04-06 | 安徽大学 | Multi-motor-driven human-shaped rod single-side unfolding mechanism |
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