CN110648569A - Frictional force demonstration platform for physics experiments - Google Patents
Frictional force demonstration platform for physics experiments Download PDFInfo
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- CN110648569A CN110648569A CN201910899835.8A CN201910899835A CN110648569A CN 110648569 A CN110648569 A CN 110648569A CN 201910899835 A CN201910899835 A CN 201910899835A CN 110648569 A CN110648569 A CN 110648569A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
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Abstract
The invention discloses a friction force demonstration platform for physical experiments, which comprises an experiment table, supporting rods, a lifting box body, a side plate, a lifting assembly, a buffering assembly, a clamping assembly and universal wheels, wherein one end of each of the four supporting rods is uniformly and fixedly arranged at the bottom end of the experiment table; the friction force demonstration platform for the physical experiment can well demonstrate the whole process of the friction force experiment, and the data is reliable; can adjust the height of laboratory bench according to mr and student's height difference, the mr and the student of being convenient for use, drive the test block through the motor at the uniform velocity and remove, the gained experimental result is more convincing, and in order to prevent the maloperation, has set up buffer, can avoid the direct striking motor of test block, can prevent that the slide from sliding, produces the influence to the experimental result.
Description
Technical Field
The invention relates to the technical field of physical experiment teaching aids, in particular to a friction force demonstration platform for a physical experiment.
Background
At present, in the aspect of physical teaching, a plurality of theoretical teaching knowledge points need to be displayed in combination with experimental demonstration teaching, so that students can conveniently understand teaching knowledge, and teachers can conveniently combine experiments to perform teaching demonstration. However, in the friction force teaching experiment process, the commonly adopted experiment teaching method is that a spring tension meter is directly adopted to carry out manual traction test, so that experiment demonstration is realized, the test mode is relatively lack of standardization, the manual traction speed is relatively unstable, no convincing force is provided for the test result of the friction force, friction plates with different friction coefficients are not fixed in the experiment process, the friction plates can slide possibly, the experiment result is influenced, and the heights of teachers and students are different from each other, so that the experiment table cannot be adjusted according to the heights of the teachers and students, and a lot of inconvenience is brought to experimenters.
Disclosure of Invention
The invention aims to provide a friction force demonstration platform for a physical experiment, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a friction force demonstration platform for physical experiments comprises an experiment table, supporting rods, a lifting box body, side plates, a protective cover, a lifting assembly, a buffering assembly, a clamping assembly, a fixed rod, a telescopic rod, a first spring and universal wheels, wherein one end of each of the four supporting rods is uniformly and fixedly arranged at the bottom end of the experiment table, the bottom ends of the supporting rods penetrate through the outer wall of the top end of the lifting box body, and the lifting assembly is arranged in the lifting box body;
the lifting assembly comprises a first screw rod, a rotating wheel, first sliding blocks, a first sliding groove, a connecting rod, a supporting plate, a second sliding block and a second sliding groove, the two sides of the inner wall of the lifting box body, which are close to the bottom, are rotatably connected with the first screw rod, one side of the first screw rod is connected to one side of the outer wall of the lifting box body in a penetrating and rotating mode through a rotating sleeve, the surface of the first screw rod is in threaded connection with the two first sliding blocks, the two sides of the first sliding blocks are movably connected with one end of the connecting rod through hinges, the other end of the connecting rod is movably hinged to the bottom end of;
the buffering assembly comprises a motor, a rotating shaft, a baffle, a stop lever, a second spring, a buffer plate, a third sliding groove, a sliding plate, a test block, a dynamometer and a traction rope, wherein the motor is fixedly installed on one side of the top end of the experiment table through a bolt, the output end of the motor is fixedly connected with one end of the rotating shaft, the baffle is fixedly installed beside the motor and positioned on the top end of the experiment table, six stop levers are uniformly and fixedly installed on one side of the baffle, the second spring is sleeved on the surface of the stop lever, one end of the second spring is fixedly connected to one side of the buffer plate, the buffer plate is slidably connected to one side of the top end of the experiment table, a third sliding groove is formed in one side of the middle of the top end of the experiment table, the sliding;
the clamping assembly comprises a fourth sliding groove, a second screw rod, a rocker, a sleeve, a connecting plate, a third spring and a pressing plate, the bottom end of the third sliding groove is communicated with the fourth sliding groove, the second screw rod is rotatably installed on one side of the fourth sliding groove through a rotating sleeve, one end of the second screw rod is fixedly connected with one end of the rocker, the other end of the rocker is communicated with the inner wall of the fourth sliding groove and is rotatably connected to one side of the experiment table through the rotating sleeve, two sleeves are in threaded connection with two sides of the surface of the second screw rod, the connecting plate is fixedly connected to one side of the sleeve, one ends of the four third springs are fixedly installed on one side of the connecting plate, and the other end of.
According to the technical scheme, both sides of the top end of the experiment table are fixedly provided with the side plates, one side of the top end of the experiment table is fixedly provided with the protective cover, the outer wall of the bottom end of the lifting box body is uniformly and fixedly provided with one end of four fixing rods, the other end of each fixing rod is fixedly connected with the top end of the telescopic rod, the bottom end of each telescopic rod is fixedly connected with the universal wheel, and the joint of each telescopic rod is sleeved with the first spring.
According to the technical scheme, the one end fixed mounting of first screw rod has the runner, and the runner is close to terminal surface one side fixed mounting and has the handle, first slider bottom sliding connection is in first spout, first spout is seted up in lift box bottom inner wall, the second spout has all been seted up to lift box inner wall both sides, sliding connection has the second slider in the second spout, the one end fixed connection of second slider is in backup pad one side.
According to the technical scheme, slide top sliding connection has the test piece, the one end of traction rope is passed through to test piece one side traction block fixedly connected with, traction rope one side fixedly connected with dynamometer, the other end of traction rope link up buffer board, baffle, protection casing one side outer wall fixed connection in proper order and is in the pivot surface.
According to the technical scheme, the universal wheel is provided with the brake pad.
According to the technical scheme, the surfaces of the first screw and the second screw are provided with threads in the positive and negative rotation directions.
According to the technical scheme, friction layers with different friction coefficients are arranged on the surface of the sliding plate.
According to the technical scheme, the top end of the test block is provided with the placing groove, and weights are placed in the placing groove.
According to the technical scheme, the buffer plate is a rubber buffer plate.
According to the technical scheme, the dynamometer is a spring dynamometer.
Compared with the prior art, the invention has the following beneficial effects: the friction force demonstration platform for the physical experiment can well demonstrate the whole process of the friction force experiment, and the data is reliable; through lifting unit's setting, can be different according to mr and student's height, adjust the height of laboratory bench, be convenient for mr and student use, setting through buffering subassembly, it removes to drive the test block at the uniform velocity through the motor, the gained experimental result is more convincing, and in order to prevent the maloperation, buffer has been set up, can avoid the direct striking motor of test block, effectively guarantee mr and student's personal safety, setting through clamping unit, the slide of the different coefficient of friction of change that can be convenient, also can prevent that the slide from sliding simultaneously, produce the influence to the experimental result.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic overall front cut-away construction of the present invention;
FIG. 2 is a front cut-away schematic view of the lift assembly of the present invention;
FIG. 3 is a schematic top view of the present invention;
FIG. 4 is a left side sectional view of the present invention;
FIG. 5 is an enlarged view of area A of FIG. 2;
FIG. 6 is an enlarged view of area B of FIG. 4;
in the figure: 1. a laboratory bench; 2. a support bar; 3. lifting the box body; 4. a side plate; 5. a protective cover; 6. a lifting assembly; 7. a buffer assembly; 8. a clamping assembly; 9. fixing the rod; 10. a telescopic rod; 11. a first spring; 12. a universal wheel; 61. a first screw; 62. a rotating wheel; 63. a first slider; 64. a first chute; 65. a connecting rod; 66. a support plate; 67. a second slider; 68. a second chute; 71. a motor; 72. a rotating shaft; 73. a baffle plate; 74. a stop lever; 75. a second spring; 76. a buffer plate; 77. a third chute; 78. a slide plate; 79. a test block; 710. a force gauge; 711. a hauling rope; 81. a fourth chute; 82. a second screw; 83. a rocker; 84. a sleeve; 85. a connecting plate; 86. a third spring; 87. and (7) pressing a plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution: a friction force demonstration platform for physical experiments comprises an experiment table 1, supporting rods 2, a lifting box body 3, side plates 4, a protective cover 5, a lifting assembly 6, a buffer assembly 7, a clamping assembly 8, fixing rods 9, a telescopic rod 10, a first spring 11 and universal wheels 12, wherein one end of each of the four supporting rods 2 is uniformly and fixedly arranged at the bottom end of the experiment table 1, the bottom end of each supporting rod 2 penetrates through the outer wall of the top end of the lifting box body 3, the side plates 4 are fixedly arranged at two sides of the top end of the experiment table 1, the protective cover 5 is fixedly arranged at one side of the top end of the experiment table 1, one end of each of the four fixing rods 9 is uniformly and fixedly arranged on the outer wall of the bottom end of the lifting box body, a first spring 11 is sleeved at the joint, a brake pad is arranged on the universal wheel 12, and a lifting assembly 6 is arranged in the lifting box body 3;
the lifting component 6 comprises a first screw 61, a rotating wheel 62, a first sliding block 63, a first sliding groove 64, a connecting rod 65, a supporting plate 66, a second sliding block 67 and a second sliding groove 68, the two sides of the inner wall of the bottom of the lifting box body 3 are rotatably connected with the first screw 61, one side of the first screw 61 is connected with one side of the outer wall of the lifting box body 3 through a rotating sleeve in a penetrating and rotating manner, the surface of the first screw 61 is in threaded connection with the two first sliding blocks 63, the two sides of the first sliding blocks 63 are movably connected with one end of the connecting rod 65 through hinges, the other end of the connecting rod 65 is movably hinged at the bottom end of the supporting plate 66 through a connecting block, the rotating wheel 62 is fixedly installed at one end of the first screw 61, a handle is fixedly installed at one side of the rotating wheel 62 close to the end surface, the surface of the first screw 61 is provided with, two sides of the inner wall of the lifting box body 3 are both provided with a second sliding chute 68, a second sliding block 67 is connected in the second sliding chute 68 in a sliding manner, one end of the second sliding block 67 is fixedly connected to one side of the supporting plate 66, and the top end of the experiment table 1 is provided with a buffer assembly 7;
the buffer component 7 comprises a motor 71, a rotating shaft 72, a baffle 73, a stop lever 74, a second spring 75, a buffer plate 76, a third chute 77, a sliding plate 78, a test block 79, a force gauge 710 and a traction rope 711, wherein the motor 71 is fixedly installed on one side of the top end of the experiment table 1 through a bolt, the output end of the motor 71 is fixedly connected with one end of the rotating shaft 72, the baffle 73 is fixedly installed beside the motor 71 and positioned on the top end of the experiment table 1, six stop levers 74 are uniformly and fixedly installed on one side of the baffle 73, the second spring 75 is sleeved on the surface of the stop lever 74, one end of the second spring 75 is fixedly connected on one side of the buffer plate 76, the buffer plate 76 is a rubber buffer plate, the buffer plate 76 is slidably connected on one side of the top end of the experiment table 1, the third chute 77 is arranged on one side of the middle part of the top end of, the top end of the sliding plate 78 is connected with a testing block 79 in a sliding mode, the top end of the testing block 79 is provided with a placing groove, weights are placed in the placing groove, one side of the testing block 79 is fixedly connected with one end of a traction rope 711 through the traction block, one side of the traction rope 711 is fixedly connected with a dynamometer 710, the dynamometer 710 is a spring dynamometer, the other end of the traction rope 711 penetrates through the buffer plate 76, the baffle plate 73 and the outer wall of one side of the protective cover 5 in sequence and is fixedly connected to the surface of the rotating shaft 72, and the bottom end;
the clamping assembly 8 comprises a fourth chute 81, a second screw 82, a rocker 83, a sleeve 84, a connecting plate 85, a third spring 86 and a pressing plate 87, the bottom end of the third chute 77 is provided with the fourth chute 81 in a penetrating manner, one side of the fourth chute 81 is rotatably provided with the second screw 82 through a rotating sleeve, the surface of the second screw 82 is provided with threads in the positive and negative rotation directions, one end of the second screw 82 is fixedly connected with one end of the rocker 83, the other end of the rocker 83 penetrates through the inner wall of the fourth chute 81 and is rotatably connected to one side of the experiment table 1 through the rotating sleeve, two sides of the surface of the second screw 82 are in threaded connection with the two sleeves 84, one side of each sleeve 84 is fixedly connected with the connecting plate 85, one side of each connecting plate 85 is fixedly provided with one end of the four; when the friction force demonstration platform for physical experiments is used, the universal wheel 12 is fixedly installed at the bottom end of the lifting box body 3, an experimenter can move the whole device through the universal wheel 12, the universal wheel 12 is provided with a brake pad and can be well fixed at a place needing to be used, after the fixation is finished, the handle on the rotating wheel 62 is rotated in the forward direction to drive the first screw rod 61 to rotate in the forward direction, so that the two first sliding blocks 63 are driven to slide relatively in the first sliding grooves 64, the connecting rod 65 hinged to one side of the first sliding block 63 is driven to move upwards in the inclined direction, the supporting plate 66 is driven to slide upwards in the second sliding groove 68 through the hinge, the experiment table 1 is driven to move upwards through the supporting rod 2, so that the height needed by the experimenter is reached, during experiments, the motor 71 works to drive the rotating shaft 72 to rotate at a constant speed, the dynamometer 710 is driven to move at a constant speed through the traction rope, at this time, the change of the index indicated by the pointer of the dynamometer 710 can be observed by replacing the weights with different masses in the test block 79, and the change is recorded, when the experimenter operates by mistake, the motor 71 is not turned off, at this time, the test block 79 and the dynamometer 710 collide against the buffer plate 76 under the traction of the traction rope 711, the second spring 75 is compressed by the buffer plate 76 to play a buffer role, personal injury to nearby people caused by direct throwing is avoided, the rocker 83 is rotated forwardly to drive the second screw 82 to rotate forwardly, so that the two sleeves 84 are driven to move in the fourth chute 81 in the opposite direction, the connecting plate 85 is driven to move in the opposite direction, the connecting plate 85 drives the pressing plate 87 to move through the third spring 86, at this time, the sliding plate 78 with different friction coefficients can be replaced, the rocker 83 is rotated reversely to drive the second screw 82 to rotate in the opposite direction, so that the two sleeves 84 are driven, and then drive connecting plate 85 and remove in opposite directions, come extrusion clamp plate 87 through compression third spring 86, carry out fixed clamp to slide 78, prevent that slide 78 from sliding and influence the experimental result, and simultaneously, observe the registration change that dynamometer 710 pointer indicates, and take notes, the experiment is accomplished the back, drive first screw rod 61 antiport through the handle on the antiport runner 62, thereby drive two first sliders 63 and slide in first spout 64 relatively, and then drive the articulated connecting rod 65 oblique lapse in first slider 63 one side, thereby drive backup pad 66 through the hinge and slide downwards in second spout 68, drive laboratory bench 1 lapse through bracing piece 2, thereby resume original height.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a frictional force demonstration platform for physics experiments, includes laboratory bench (1), bracing piece (2), lift box (3), curb plate (4), protection casing (5), lifting unit (6), buffering subassembly (7), clamping component (8), dead lever (9), telescopic link (10), first spring (11) and universal wheel (12), its characterized in that: one ends of four support rods (2) are uniformly and fixedly mounted at the bottom end of the experiment table (1), the bottom ends of the support rods (2) penetrate through the outer wall of the top end of the lifting box body (3), and a lifting assembly (6) is arranged in the lifting box body (3);
the lifting assembly (6) comprises a first screw (61), a rotating wheel (62), a first sliding block (63), a first sliding groove (64), a connecting rod (65), a supporting plate (66), a second sliding block (67) and a second sliding groove (68), the two sides of the inner wall, close to the bottom, of the lifting box body (3) are rotatably connected with the first screw (61), one side of the first screw (61) is connected to one side of the outer wall of the lifting box body (3) in a penetrating and rotating mode through a rotating sleeve, the surface of the first screw (61) is in threaded connection with the two first sliding blocks (63), the two sides of the first sliding blocks (63) are movably connected with one end of the connecting rod (65) through hinges, the other end of the connecting rod (65) is movably hinged to the bottom end of the supporting plate (66) through a connecting block, and the;
the buffer component (7) comprises a motor (71), a rotating shaft (72), a baffle (73), stop rods (74), a second spring (75), a buffer plate (76), a third sliding groove (77), a sliding plate (78), a test block (79), a dynamometer (710) and a traction rope (711), wherein the motor (71) is fixedly installed on one side of the top end of the experiment table (1) through bolts, the output end of the motor (71) is fixedly connected with one end of the rotating shaft (72), the baffle (73) is fixedly installed beside the motor (71) and positioned on the top end of the experiment table (1), six stop rods (74) are uniformly and fixedly installed on one side of the baffle (73), the second spring (75) is sleeved on the surface of each stop rod (74), one end of the second spring (75) is fixedly connected to one side of the buffer plate (76), and the buffer plate (76) is slidably connected to one side of the top end of the experiment table (, a third sliding chute (77) is formed in one side of the middle of the top end of the experiment table (1), a sliding plate (78) is connected in the third sliding chute (77) in a sliding mode, and a clamping assembly (8) is arranged at the bottom end of the third sliding chute (77);
the clamping component (8) comprises a fourth sliding chute (81), a second screw rod (82), a rocker (83), a sleeve (84), a connecting plate (85), a third spring (86) and a pressing plate (87), a fourth sliding chute (81) is formed at the bottom end of the third sliding chute (77) in a penetrating way, a second screw (82) is rotatably arranged at one side of the fourth sliding chute (81) through a rotating sleeve, one end of the second screw rod (82) is fixedly connected with one end of the rocker (83), the other end of the rocker (83) penetrates through the inner wall of the fourth chute (81) and is rotatably connected to one side of the experiment table (1) through a rotating sleeve, two sleeves (84) are connected with two sides of the surface of the second screw (82) in a threaded manner, one side of the sleeve (84) is fixedly connected with a connecting plate (85), one side of the connecting plate (85) is fixedly provided with one end of four third springs (86), the other end of the third spring (86) is fixedly connected to one side of the pressure plate (87).
2. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: laboratory bench (1) top both sides fixed mounting has curb plate (4), laboratory bench (1) top one side fixed mounting has protection casing (5), the even fixed mounting of lift box (3) bottom outer wall has the one end of four dead levers (9), the other end of dead lever (9) and the top fixed connection of telescopic link (10), telescopic link (10) bottom fixedly connected with universal wheel (12), and the junction has cup jointed first spring (11).
3. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: the one end fixed mounting of first screw rod (61) has runner (62), and runner (62) are close to terminal surface one side fixed mounting and have the handle, first slider (63) bottom sliding connection is in first spout (64), first spout (64) are seted up in lift box (3) bottom inner wall, second spout (68) have all been seted up to lift box (3) inner wall both sides, sliding connection has second slider (67) in second spout (68), the one end fixed connection of second slider (67) is in backup pad (66) one side.
4. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: slide (78) top sliding connection has test block (79), the one end of pull block fixedly connected with haulage rope (711) is passed through to test block (79) one side, haulage rope (711) one side fixedly connected with dynamometer (710), the other end of haulage rope (711) link up buffer board (76), baffle (73), protection casing (5) one side outer wall fixed connection in proper order is on pivot (72) surface.
5. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: and the universal wheel (12) is provided with a brake pad.
6. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: the surfaces of the first screw rod (61) and the second screw rod (82) are provided with threads in forward and reverse rotation directions.
7. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: the surface of the sliding plate (78) is provided with friction layers with different friction coefficients.
8. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: the top end of the test block (79) is provided with a placing groove, and weights are placed in the placing groove.
9. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: the buffer plate (76) is a rubber buffer plate.
10. The friction force demonstration platform for the physical experiment according to claim 1, characterized in that: the load cell (710) is a spring load cell.
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