CN203588525U - Teaching aid for demonstrating torsional deformation of solid rectangular-cross section bar - Google Patents
Teaching aid for demonstrating torsional deformation of solid rectangular-cross section bar Download PDFInfo
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- CN203588525U CN203588525U CN201320777727.1U CN201320777727U CN203588525U CN 203588525 U CN203588525 U CN 203588525U CN 201320777727 U CN201320777727 U CN 201320777727U CN 203588525 U CN203588525 U CN 203588525U
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Abstract
Disclosed in the utility model is a teaching aid for demonstrating torsional deformation of a solid rectangular-cross section bar. The teaching aid comprises a support rack, cover plates, and an elastic rubber bar. The elastic rubber bar includes a rectangular-cross section bar, a circular-cross section installing portion, and square-cross section clamping portions; and longitudinal lines that are parallel to a center line and are distributed at equal intervals and horizontal lines that are perpendicular to the center line and are distributed at equal intervals are arranged at the external circumference surface of the rectangular-cross section bar. The support rack includes a pedestal and two support seats that are arranged symmetrically at the left and right sides of the pedestal; the cover plates are respectively arranged above the support seats; and the support rack and the cover plates are locked by bolts. The circular-cross section installing portion is clamped into a circular hole formed by enclosing of a first semicircular notch and a second semicircular notch; and angle scale lines encircling the circular hole are arranged at the inner walls and the outer walls of the cover plates. With the teaching aid, the deformation situation of the solid rectangular-cross section bar during torsion as well as the relation between the torsion change and the material deformation can be demonstrated visually and vividly; and the students can carry out observation conveniently. The teaching aid with the simple structure can be operated conveniently.
Description
Technical field
The utility model relates to teaching aid, for demonstrating the teaching aid of Filled Rectangle section bar torsional deflection.
Background technology
In conjunction with Fig. 1, Figure 2 shows that the situation of Filled Rectangle section bar torsional deflection, in field research process, only depend on the theoretical student of lecturing feel untrue, directly perceived lively, be not easy to understand, often do not reach the effect of hope, make troubles to teacher's teaching.
Utility model content
The purpose of this utility model is to provide a kind of demonstration teaching aid, can show intuitively, visually the phenomenon of Filled Rectangle section bar torsional deflection, so that observation of students, understanding.
For reaching above-mentioned purpose, a kind of Filled Rectangle section bar torsional deflection demonstration teaching aid that the utility model provides, comprise a bracing frame (1), two cover plates (2) and an elastic caoutchouc rod (3), described elastic caoutchouc rod (3) is by the square-section bar (3a) at middle part, be symmetricly set on the round section installation portion (3b) at square-section bar (3a) two ends, the square-section clamping part (3e) that is positioned at round section installation portion (3b) outer end forms, on the lateral wall of square-section bar (3a), be provided with some vertical lines that are parallel to center line and are equally spaced (3c) and some perpendicular to center line the x wire (3d) that is equally spaced, the lateral wall of square-section bar (3a) is divided into some grids, support frame as described above (1) is whole L-shaped, by base (1a), the bearing (1b) that is symmetricly set on base (1a) left and right sides forms, the top of each bearing (1b) is provided with a described cover plate (2), and bracing frame (1) is locked together by bolt (4) with cover plate (2), the upper end of described bearing (1b) has the first semicircle breach (A), the lower end of cover plate (2) has the second semicircle breach (B), described round section installation portion (3b) is clamped in the circular hole that the first semicircle breach (A) and the second semicircle breach (B) surround, in each cover plate (2), on outer wall, be provided with the angle groove around described circular hole.
Be preferably, the starting point of described angle groove be positioned at the second semicircle breach (B) middle part directly over, in all vertical lines (3c), have one to highlight.During use, the vertical line highlighting overlaps with the starting point of angle groove, more can quantitatively demonstrate the relation of square-section bar distortion and rotational angle.
On the lateral wall of the square-section of elastic caoutchouc rod bar, arrange many and be parallel to center line the vertical line being equally spaced and many perpendicular to center line the x wire that is equally spaced, thereby form many grids at the lateral wall of square-section bar.The square-section clamping part at elastic caoutchouc rod two ends, can insert in the sleeve of torque spanner, by torque spanner, elastic caoutchouc rod is applied the couple of a pair of equal and opposite in direction, opposite direction, can find that following variation occurs on elastic caoutchouc rod surface: the vertical line generation warpage of the x wire of (1) each vertical center line and parallel center line, the hypothesis of plane mechanism is no longer set up; (2) grid on square-section bar lateral wall, there is in various degree crooked, surrounding edges and corners, grid right angle does not become, without shear stress, the mid point at each edge from corner angle to cross section, change amount in grid right angle increases gradually, and long limit mid point is maximum, on xsect, has shear stress, long limit mid point is maximum, and edges and corners shear stress is zero.
The beneficial effects of the utility model are: can show intuitively, visually the deformation of Filled Rectangle section bar when reversing and the relation of torsion variation and material deformation, so that observation of students, understanding grasp its change procedure and principle, and simple in structure, easy to operate.
Accompanying drawing explanation
Fig. 1 is the schematic diagram before Filled Rectangle section bar is reversed.
Fig. 2 is the schematic diagram after the torsional deflection of Filled Rectangle section bar.
Fig. 3 is structural representation of the present utility model.
Fig. 4 is the C-C cut-open view of Fig. 3.
Fig. 5 is the decomposing schematic representation of Fig. 3.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
In conjunction with Fig. 3---the Filled Rectangle section bar torsional deflection demonstration teaching aid shown in Fig. 5, is comprised of a bracing frame 1, two cover plates 2, elastic caoutchouc rod 3 and some bolts 4.Elastic caoutchouc rod 3 consists of the square-section bar 3a at middle part, the round section installation portion 3b that is symmetricly set on bar 3a two ends, square-section, the square-section clamping part 3e that is positioned at round section installation portion 3b outer end, the xsect of clamping part 3e is square, mates with the sleeve of torque spanner.On the outer circumference surface of square-section bar 3a, be provided with some the vertical line 3c that are parallel to center line and are equally spaced, some perpendicular to center line the x wire 3d that is equally spaced, the lateral wall of square-section bar 3a is divided into some grids.
Preferably, the starting point of angle groove be positioned at the second semicircle breach B middle part directly over, in all vertical line 3c, have one to highlight, can highlight by the mode of redness or lines overstriking a wherein vertical line 3c.
This demonstration teaching aid can be observed the deformation of Filled Rectangle section bar when reversing and the relation (variation of grid shape that lines intersect to form and the relation of torsion) of torsion variation and material deformation intuitively, can repeatedly repeat demonstration, economic Environmental Safety; The xsect of the two ends clamping part 3e of elastic caoutchouc rod 3 is square, can insert in the sleeve of torque spanner, above the bar 3a of square-section, there are many vertical line 3cs parallel with center line and the x wire 3d vertical with center line, wherein an x wire 3d parallel with center line highlights, and crisscross lines form many grids.During use, the round section installation portion 3b of elastic caoutchouc rod 3 by two ends is put on bracing frame 1, and the square clamping part 3e at two ends is outside bracing frame 1, and bracing frame 1 is fixed together with cover plate 2 use bolts 4; Allow the x wire 3d highlighting overlap with the scale mark starting point on bracing frame 1.Sleeve with torque spanner, insert in the clamping part 3e at elastic caoutchouc rod 3 two ends, select identical torsion, different directions to pull elastic caoutchouc rod 3, can find that the grid shape that lines intersect to form changes, the relative scale mark starting point of the x wire 3d angle highlighting is found to change, and the variation that increases grid shape and windup-degree with torsion also increases.
By above demonstration, illustrate: the vertical line generation warpage of the x wire of (1) each vertical center line and parallel center line, the hypothesis of plane mechanism is no longer set up; (2) grid on square-section bar lateral wall, there is in various degree crooked, surrounding edges and corners, grid right angle does not become, without shear stress, the mid point at each edge from corner angle to cross section, change amount in grid right angle increases gradually, and long limit mid point is maximum, on xsect, has shear stress, long limit mid point is maximum, and edges and corners shear stress is zero.
Claims (2)
1. a Filled Rectangle section bar torsional deflection demonstration teaching aid, it is characterized in that: comprise a bracing frame (1), two cover plates (2) and an elastic caoutchouc rod (3), described elastic caoutchouc rod (3) is by the square-section bar (3a) at middle part, be symmetricly set on the round section installation portion (3b) at square-section bar (3a) two ends, the square-section clamping part (3e) that is positioned at round section installation portion (3b) outer end forms, on the lateral wall of square-section bar (3a), be provided with some vertical lines that are parallel to center line and are equally spaced (3c) and some perpendicular to center line the x wire (3d) that is equally spaced, the lateral wall of square-section bar (3a) is divided into some grids, support frame as described above (1) is whole L-shaped, by base (1a), the bearing (1b) that is symmetricly set on base (1a) left and right sides forms, the top of each bearing (1b) is provided with a described cover plate (2), and bracing frame (1) is locked together by bolt (4) with cover plate (2), the upper end of described bearing (1b) has the first semicircle breach (A), the lower end of cover plate (2) has the second semicircle breach (B), described round section installation portion (3b) is clamped in the circular hole that the first semicircle breach (A) and the second semicircle breach (B) surround, in each cover plate (2), on outer wall, be provided with the angle groove around described circular hole.
2. Filled Rectangle section bar torsional deflection demonstration teaching aid according to claim 1, is characterized in that: the starting point of described angle groove be positioned at the second semicircle breach (B) middle part directly over, in all vertical lines (3c), have one to highlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320777727.1U CN203588525U (en) | 2013-11-29 | 2013-11-29 | Teaching aid for demonstrating torsional deformation of solid rectangular-cross section bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320777727.1U CN203588525U (en) | 2013-11-29 | 2013-11-29 | Teaching aid for demonstrating torsional deformation of solid rectangular-cross section bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203588525U true CN203588525U (en) | 2014-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320777727.1U Expired - Fee Related CN203588525U (en) | 2013-11-29 | 2013-11-29 | Teaching aid for demonstrating torsional deformation of solid rectangular-cross section bar |
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| Country | Link |
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| CN (1) | CN203588525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112133168A (en) * | 2020-10-19 | 2020-12-25 | 西安航空学院 | Small portable entity teaching aid for torsional stress distribution of material mechanics |
-
2013
- 2013-11-29 CN CN201320777727.1U patent/CN203588525U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112133168A (en) * | 2020-10-19 | 2020-12-25 | 西安航空学院 | Small portable entity teaching aid for torsional stress distribution of material mechanics |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20141129 |
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| EXPY | Termination of patent right or utility model |