CN116296885A - Four-bar linkage bending and twisting experimental device - Google Patents
Four-bar linkage bending and twisting experimental device Download PDFInfo
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- CN116296885A CN116296885A CN202310593471.7A CN202310593471A CN116296885A CN 116296885 A CN116296885 A CN 116296885A CN 202310593471 A CN202310593471 A CN 202310593471A CN 116296885 A CN116296885 A CN 116296885A
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- 238000005452 bending Methods 0.000 title claims abstract description 30
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- 239000010959 steel Substances 0.000 claims abstract description 110
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- 238000012360 testing method Methods 0.000 claims description 19
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 abstract description 18
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
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- 230000009286 beneficial effect 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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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
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0021—Torsional
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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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Abstract
The invention relates to the technical field of building structure experiments, in particular to a four-bar linkage bending and twisting experimental device. The four-bar linkage experimental device comprises a guide rail, a ground beam, a top beam, four-bar linkage rods, conversion steel beams, a reaction frame and actuators, wherein the four-bar linkage rods are arranged on the right side of the guide rail, each four-bar linkage rod comprises four steel beams, two adjacent steel beams are hinged, the bottom end of each top beam is fixedly connected with a hinge shaft between the two steel beams positioned on the upper part, the top end of each top beam is fixedly connected with the actuators, the top end of each ground beam is fixedly connected with the hinge shaft between the two steel beams positioned on the lower part, the conversion steel beams are positioned in the center of each four-bar linkage rod, and a plurality of loading connecting holes are uniformly distributed on the right end face of each conversion steel beam; the support assembly comprises a base, boundary steel beams and a pressing beam, wherein a plurality of support connecting holes are uniformly distributed on the left end face of the boundary steel beams. The device has improved the precision of experiment.
Description
Technical Field
The invention relates to the technical field of building structure experiments, in particular to a bending and twisting experimental device, and specifically relates to a four-bar linkage bending and twisting experimental device.
Background
With the development of building structural systems, the load-bearing test pieces often bear the combined action of bending-torsion loads under the influence of design requirements and external environments. The wind power tower structure which is developed rapidly at present belongs to a flexible structure, so that the wind power tower structure is sensitive to bending moment and torque caused by wind load.
The bending torsion experiment device is realized through the cooperative loading of two horizontal actuators in the doctor's thesis of the traditional bending torsion experiment device such as a bending torsion effect research of a curve beam bridge concrete filled steel tube pier published by Wang Yuhang of the university of Qinghai in 2013. The bending torsion experimental device is widely applied due to the good simulation effect, but the experimental device has the following defects when performing the bending torsion experiment: 1) The test piece can axially deform in the bending and torsion experiment process, and the loading beam can axially displace along with the axial deformation, so that the horizontal force acting line of the actuator is downwards deflected, and the accuracy of the experiment is reduced; 2) When a bending torsion experiment is carried out, coordinated loading of two actuators is needed, and the loading process is too complicated.
Disclosure of Invention
The invention aims to solve the problems that the existing bending experiment device is low in experimental accuracy and the coordinated loading process of two actuators is complicated, and provides a four-bar linkage bending experiment device.
The invention is realized by adopting the following technical scheme: a four-bar linkage bending and twisting experimental device comprises a loading assembly and a supporting assembly;
the loading assembly comprises a guide rail, a ground beam, a top beam, four-bar linkage rods, a conversion steel beam, a reaction frame and an actuator, wherein the guide rail, the ground beam, the top beam, the four-bar linkage rods, the conversion steel beam, the reaction frame and the actuator are vertically arranged and are arranged on the right side of the guide rail in parallel;
the support component comprises a base, a boundary steel beam and a pressing beam which are sequentially arranged from bottom to top, a plurality of upper rollers which are uniformly distributed along the left-right direction and the axial direction of which is uniformly distributed along the front-back direction are arranged between the base and the boundary steel beam, a plurality of lower rollers which are uniformly distributed along the left-right direction and the axial direction of which is uniformly distributed along the front-back direction are arranged between the pressing beam and the boundary steel beam, the base and the pressing beam are connected through a long anchor rod, and a plurality of support connecting holes which are fixedly connected with a connecting plate at the other end of a test piece through bolts are uniformly distributed on the left end face of the boundary steel beam.
When in use, the utility model is characterized in that: the bottom of the guide rail, the bottom of the ground beam and the bottom of the base are all fixed at corresponding positions on the ground, then the rest parts of the device are installed, when the four-bar linkage rod piece is installed, a temporary pull rod can be detachably installed at the included angle of the inner sides of two adjacent steel beams so as to guarantee the stability of the four-bar linkage rod piece, after the installation is finished, one end connecting plate of the test piece is fixedly connected with the right end face of the conversion steel beam through bolts, the other end connecting plate of the test piece is fixedly connected with the left end face of the conversion steel beam through bolts, the temporary pull rod is removed during an experiment, the top beam is driven by the actuator to move downwards, the four-bar linkage is forced to deform, and the test piece is subjected to bending and torsion load.
The beneficial effects of the invention are as follows: 1) The device can be suitable for test pieces with various cross-sectional shapes and cross-sectional sizes, and can also realize the fixation of test pieces with different lengths by moving the relative positions of the base relative to the ground beam; 2) When the device is used for a bending experiment, the action line of the actuator cannot deviate due to bending deformation of the test piece, so that the stress performance of the test piece under the action of bending load can be better simulated, and the accuracy of the experiment is improved; 3) When the device is adopted for a bending and twisting experiment, only one actuator is required to act, so that the device is simple in loading and convenient to install, and can be arranged vertically or horizontally to adapt to various laboratory conditions; 4) Through setting up roller bearing and lower roller bearing in supporting component for the axial deformation that the test piece produced under the bending load effect will be released by the orientation, improves the stability and the precision of this experiment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of the whole structure of a four-bar linkage bending and twisting experimental device;
FIG. 2 is a schematic diagram of the overall structure of the four-bar linkage bending and torsion experimental device (no-back frame and actuator);
FIG. 3 is a schematic diagram of the overall structure of the four-bar linkage bending and torsion experimental device of the invention (no-back frame and actuator);
fig. 4 is a schematic diagram of an assembly structure between a hinge shaft, a slider, an inner rolling bearing, an outer rolling bearing and two nuts between a first steel beam and a second steel beam.
In the figure: 1-test piece, 2-connecting plate, 3-actuator, 4-guide rail, 5-floor beam, 6-top beam, 7-conversion steel beam, 8-reaction frame, 9-first steel beam, 10-second steel beam, 11-third steel beam, 12-fourth steel beam, 13-base, 14-boundary steel beam, 15-press beam, 16-upper roller, 17-lower roller, 18-long anchor rod, 19-slider, 20-screw, 21-inner fixed shaft, 22-inner rolling bearing, 23-outer fixed shaft, 24-outer rolling bearing, 25-conversion double lug plate, 26-conversion single lug plate, 27-top beam double lug plate and 28-nut.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the description, it should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms described above will be understood by those of ordinary skill in the art as the case may be.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the invention.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, 2, 3 and 4, the four-bar linkage bending and twisting experimental device comprises a loading assembly and a supporting assembly;
the loading assembly comprises a guide rail 4, a ground beam 5, a top beam 6, four-bar linkage rods, a conversion steel beam 7, a reaction frame 8 and an actuator 3 which are vertically arranged, wherein the four-bar linkage rods are vertically arranged and are arranged in parallel on the right side of the guide rail 4, the four-bar linkage rods comprise four steel beams which are integrally enclosed into a parallelogram and are respectively a first steel beam 9 and a second steel beam 10 which are positioned at the upper part of the center of the parallelogram, a third steel beam 11 and a fourth steel beam 12 which are positioned at the lower part of the center of the parallelogram, the adjacent two steel beams are hinged (how the two steel beams can be hinged by a person in the field can be obtained through conventional means), the hinge structure can be realized through the cooperation of an ear plate and a hinge shaft), the hinge shaft is axially arranged along the left and right direction, the hinge shaft between the first steel beam 9 and the second steel beam 10 is connected with the guide rail 4 in a sliding manner, the bottom end of the top beam 6 is fixedly connected with the hinge shaft between the first steel beam 9 and the second steel beam 10, the top end of the actuator 3 is fixed to the counter-force frame 8 (how the reaction frame 8 is arranged by a conventional technical means of the person in the field, as long as the fixing 3 can be provided), the top end of the top beam 6 and the top end of the top beam 7 is fixedly connected with the steel beam 3 and the bottom end of the fourth steel beam 3 through the opposite to the hinge shaft 7 which is arranged along the hinge shaft corresponding to the opposite to the axial direction of the hinge shaft 7 (the hinge shaft 7) and the opposite to the axial direction of the top end of the conversion steel rod 7, a plurality of loading connecting holes for fixedly connecting with the connecting plate 2 at one end of the test piece 1 through bolts are uniformly distributed in the center of the right end surface of the conversion steel beam 7;
the support component includes from lower supreme base 13, boundary girder steel 14, the pressure roof beam 15 that arranges in proper order, be equipped with a plurality of along controlling the direction equipartition and its axial all along the last roller bearing 16 that the fore-and-aft direction arranged between base 13 and the boundary girder steel 14, be equipped with a plurality of along controlling the direction equipartition and its axial all along the lower roller bearing 17 that the fore-and-aft direction arranged between pressure roof beam 15 and the boundary girder steel 14, base 13 passes through long stock 18 with pressure roof beam 15 and realizes being connected, the left end face equipartition of boundary girder steel 14 has a plurality of support connecting holes that are used for through bolt fixed connection with connecting plate 2 of the other one end of test piece 1.
When in use, the utility model is characterized in that: the bottom of the guide rail 4, the bottom of the ground beam 5 and the bottom of the base 13 are all fixed at the corresponding positions on the ground, then the rest parts of the device are installed, when the four-bar linkage rod piece is installed, a temporary pull rod can be detachably installed at the included angle of the inner sides of two adjacent steel beams so as to ensure the stability of the four-bar linkage rod piece, after the installation is finished, one end connecting plate 2 of the test piece 1 is fixedly connected with the right end face of the conversion steel beam 7 through bolts, the other end connecting plate 2 of the test piece 1 is fixedly connected with the left end face of the conversion steel beam 7 through bolts, during an experiment, the temporary pull rod is removed, the top beam 6 is driven to move downwards by the actuator 3, the four-bar linkage is forced to deform, and the test piece 1 is subjected to bending and torsion load.
In specific implementation, the guide rail 4 is a C-shaped chute, one end, close to the chute, of the hinge shaft between the first steel beam 9 and the second steel beam 10 is fixed with a slide block 19, the left end part of the slide block 19 is located in the chute, the front side surface and the rear side surface of the slide block are both fixed with inner fixed shafts 21 axially arranged along the front-rear direction, the end part of each inner fixed shaft 21, which is not fixed with the slide block 19, is fixedly sleeved with inner rolling bearings 22 in sliding fit with the chute, the right end part of the slide block 19 is located outside the chute, the front side surface and the rear side surface of the slide block 19 are both fixed with outer fixed shafts 23 axially arranged along the front-rear direction, and the end part of each outer fixed shaft 23, which is not fixed with the slide block 19, is fixedly sleeved with outer rolling bearings 24 in sliding fit with the chute, so that friction is greatly reduced, and the stability of the device in experiment is improved.
During concrete implementation, two oppositely arranged steel beams hinged with the conversion steel beam 7 are a first steel beam 9 and a third steel beam 11, conversion double-lug plates 25 are fixed on the inner side surfaces of the first steel beam 9 and the third steel beam 11, conversion single-lug plates 26 matched with the conversion double-lug plates 25 are fixed on two ends of the conversion steel beam 7 corresponding to the first steel beam 9 and the third steel beam 11, and two opposite ends of the conversion steel beam 7 are hinged with the inner side surfaces of the first steel beam 9 and the third steel beam 11 respectively after the hinge shaft passes through the conversion double-lug plates 25 and the conversion single-lug plates 26. The structure is concrete and standardized.
In specific implementation, the bottom end surface of the top beam 6 is fixed with a top beam double-lug plate 27, the hinge shaft of the first steel beam 9 and the hinge shaft of the second steel beam 10 are screw rods 20, the hinge position of the first steel beam 9 and the hinge position of the second steel beam 10 are located between the top beam double-lug plate 27, the bottom end of the top beam 6 is fixedly connected through two nuts 28 located on two sides of the top beam double-lug plate 27, installation and disassembly are convenient, and meanwhile perpendicularity of the four-bar linkage rod is convenient to adjust when the four-bar linkage rod is installed.
In the specific embodiment of the year, the first steel beam 9, the second steel beam 10, the third steel beam 11 and the fourth steel beam 12 are all box-shaped beams or I-shaped beams, so that the stability of the device is improved.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Although described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and they should be construed as covering the scope of the appended claims.
Claims (5)
1. The four-bar linkage bending and twisting experimental device is characterized by comprising a loading assembly and a supporting assembly;
the loading assembly comprises a guide rail (4), a ground beam (5), a top beam (6), four-bar linkage rods, a conversion steel beam (7), a counter-force frame (8) and an actuator (3), wherein the four-bar linkage rods are vertically arranged and are arranged on the right side of the guide rail (4) in parallel, each four-bar linkage rod comprises four steel beams which are integrally enclosed to form a parallelogram and are respectively a first steel beam (9) and a second steel beam (10) which are positioned at the upper part of the center of the parallelogram, a third steel beam (11) and a fourth steel beam (12) which are positioned at the lower part of the center of the parallelogram, the adjacent two steel beams are hinged and the axial direction of a hinge shaft is arranged along the left-right direction, the hinge shaft between the first steel beam (9) and the second steel beam (10) is connected with the guide rail (4) in a sliding manner, the bottom end of the top beam (6) is fixedly connected with the hinge shaft between the first steel beam (9) and the second steel beam (10), the top end of the top beam (3) is fixedly arranged on the counter-force frame (8), the top center of the top beam (6) is fixedly connected with the bottom end of the actuator (3), the action line of the actuator (3) is fixedly connected with the top end of the counter-force frame (7) through the four-bar linkage rod, the top end of the ground beam (5) is arranged along the opposite axial direction of the opposite to the hinge shaft between the opposite side of the four-bar linkage rod (7) and the opposite hinge shaft (7) and the opposite to the hinge shaft arranged along the axial direction of the opposite side, a plurality of loading connecting holes for fixedly connecting with a connecting plate (2) at one end of the test piece (1) through bolts are uniformly distributed in the center of the right end surface of the conversion steel beam (7);
the support assembly comprises a base (13), a boundary steel beam (14) and a pressing beam (15) which are sequentially arranged from bottom to top, a plurality of upper rollers (16) which are uniformly distributed along the left-right direction and are axially arranged along the front-rear direction are arranged between the base (13) and the boundary steel beam (14), a plurality of lower rollers (17) which are uniformly distributed along the left-right direction and are axially arranged along the front-rear direction are arranged between the pressing beam (15) and the boundary steel beam (14), the base (13) and the pressing beam (15) are connected through long anchor rods (18), and a plurality of support connecting holes which are used for being fixedly connected with connecting plates (2) at the other end of a test piece (1) through bolts are uniformly distributed on the left end face of the boundary steel beam (14).
2. The four-bar linkage bending and torsion experimental device according to claim 1, wherein the guide rail (4) is a C-shaped chute, one end, close to the chute, of the hinge shaft between the first steel beam (9) and the second steel beam (10) is fixedly provided with a sliding block (19), the left end part of the sliding block (19) is positioned in the chute, the front side surface and the rear side surface of the sliding block are respectively fixedly provided with an inner fixed shaft (21) axially arranged along the front and rear directions, the end part of each inner fixed shaft (21) which is not fixed with the sliding block (19) is fixedly sleeved with an inner rolling bearing (22) in sliding fit with the chute, the right end part of the sliding block (19) is positioned outside the chute, the front side surface and the rear side surface of the sliding block are respectively fixedly provided with an outer fixed shaft (23) axially arranged along the front and rear directions, and the end part of each outer fixed shaft (23) which is not fixed with the sliding block (19) is fixedly sleeved with an outer rolling bearing (24) in sliding fit with the chute.
3. The four-bar linkage bending-torsion experimental device according to claim 2, wherein two oppositely arranged steel beams hinged with the conversion steel beam (7) are a first steel beam (9) and a third steel beam (11), the inner side surfaces of the first steel beam (9) and the third steel beam (11) are both fixed with conversion double-lug plates (25), two ends of the conversion steel beam (7) corresponding to the first steel beam (9) and the third steel beam (11) are both fixed with conversion single-lug plates (26) matched with the conversion double-lug plates (25), and two opposite ends of the conversion steel beam (7) are hinged with the inner side surfaces of the first steel beam (9) and the third steel beam (11) respectively after the hinge shaft passes through the conversion double-lug plates (25) and the conversion single-lug plates (26).
4. A four-bar linkage bending-torsion experimental device according to claim 3, characterized in that a top beam double-lug plate (27) is fixed on the bottom end surface of the top beam (6), the hinge shaft of the first steel beam (9) and the hinge shaft of the second steel beam (10) are screw rods (20), the hinge position of the first steel beam (9) and the hinge position of the second steel beam (10) are positioned between the top beam double-lug plate (27), and the bottom ends of the top beam (6) are fixedly connected through two nuts (28) positioned on two sides of the top beam double-lug plate (27) respectively.
5. The four-bar linkage bending and torsion experimental device according to claim 4, wherein the first steel beam (9), the second steel beam (10), the third steel beam (11) and the fourth steel beam (12) are box beams or I-beams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310593471.7A CN116296885B (en) | 2023-05-25 | 2023-05-25 | Four-bar linkage bending and twisting experimental device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310593471.7A CN116296885B (en) | 2023-05-25 | 2023-05-25 | Four-bar linkage bending and twisting experimental device |
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| CN116296885A true CN116296885A (en) | 2023-06-23 |
| CN116296885B CN116296885B (en) | 2023-08-29 |
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