CN108648571B - A kind of demonstrator of rational mechanics equilibrium of couples - Google Patents
A kind of demonstrator of rational mechanics equilibrium of couples Download PDFInfo
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- CN108648571B CN108648571B CN201810755238.3A CN201810755238A CN108648571B CN 108648571 B CN108648571 B CN 108648571B CN 201810755238 A CN201810755238 A CN 201810755238A CN 108648571 B CN108648571 B CN 108648571B
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- drag rope
- elastic drag
- balancing pole
- couples
- tension
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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
Abstract
The invention discloses a kind of demonstrator of rational mechanics equilibrium of couples, bar axis is fixed on bottom plate, rod sleeve is set in sleeve, and sleeve is set to the center of the annulus in the middle part of balancing pole, and is connected by the more springs for being connected with tension-compression sensor with annulus；The left and right side of balancing pole is equipped with the first sliding rail, and multiple first sliding seats are slidably connected on the first sliding rail, and each first sliding seat is connect with one end of an elastic drag rope respectively, and the other end of elastic drag rope is connected with hook；Tension measurement meter and elastic drag rope winding mechanism are also connected on each elastic drag rope；One second sliding rail is also respectively set in the left and right ends of bottom plate, slidably connects multiple second sliding seats on each second sliding rail respectively, is respectively equipped with a link on each second sliding seat；Microprocessor and voice guard are additionally provided on balancing pole.The configuration of the present invention is simple, it is practical, abstract equilibrium of couples principle can be visually shown to come using laboratory apparatus, consequently facilitating student understands the action principle of couple.
Description
Technical field
The present invention relates to physical experiment apparatus field, in particular to a kind of demonstrator of rational mechanics equilibrium of couples.
Background technique
Couple is exactly equivalent, reversed, not conllinear a pair of of the power acted on same object.Couple generates rotation to object
Effect, its measurement indicate with the moment of couple, i.e. vertical range between the size of any one power and two line of forces
Product.
Couple is exactly by equal in magnitude, contrary, the effect of two power parallel to each other.It is to object generation
Pure turning effect (note that pure turning effect does not need the subsidiary conditions such as fixed rotating shaft or fulcrum).Phase between two power in couple
Away from vertical range be known as the arm of couple.Couple should make the turning effect that object generates with two power for constituting couple to couple
It is measured with the square algebraical sum of any point in plane, our the two power are referred to as the moment of couple to the algebraical sum of the square of certain point.So
The moment of couple is measurement of the couple to object turning effect.If with m (F, F') indicate couple (F, F') the moment of couple, then with torque one
Sample, the moment of couple can also indicate that numerical value is equal to the size of a power and the product of the arm of couple in couple, positive and negative with an algebraic quantity
Two kinds of counterturns of couple number are then respectively indicated, is positive if regulation turns to counterclockwise, is negative clockwise.And the plane system of couples
Necessity and the adequate condition of balance are that the algebraical sum of all moments of couple is equal to zero.In physical teaching course, how will be abstracted
Equilibrium of couples principle visually shown using laboratory apparatus come, consequently facilitating student understands the action principle of couple, be
One is worth the project of further investigation.
Summary of the invention
The object of the present invention is to provide a kind of demonstrator of the rational mechanics equilibrium of couples of of simple structure and strong practicability, energy
It is enough to visually show abstract equilibrium of couples principle using laboratory apparatus to come, consequently facilitating student understands the effect of couple
Principle.
The technical scheme is that a kind of demonstrator of rational mechanics equilibrium of couples, including bottom plate, it is fixed on bottom plate
The bar axis perpendicular with backplate surface, the bar axis are arranged in sleeve set by balancing pole middle part, enable balancing pole around rod
Axis rotation, the middle part of the balancing pole are an annulus, which is fixedly connected on the top half of balancing pole and it is divided in lower half
Between, the sleeve is located at the center of the annulus, and is circumferentially uniformly distributed by more around sleeve between sleeve and annulus
Spring be connected, the tension-compression sensor for measuring its tension and compression value is also connected on every spring；The left and right sides of the balancing pole
It is respectively equipped with the first sliding rail along balancing pole longitudinal direction on side, also slidably connects multiple first respectively on every first sliding rail
Sliding seat, each first sliding seat are connect with one end of an elastic drag rope respectively, and the other end of elastic drag rope is connected with hook；Respectively
It is also respectively connected based on the tension measurement by measuring elastic drag rope value of thrust and is connected on elastic drag rope for passing through volume
The elastic drag rope winding mechanism of elastic drag rope value of thrust is adjusted around the method for elastic drag rope；Also distinguish on each first sliding seat
Equipped with the first locking mechanism for locking relative position between the first sliding seat and the first sliding rail；The left and right ends of the bottom plate
One second sliding rail is also respectively set, slidably connects multiple second sliding seats, each second sliding on every second sliding rail respectively
A link and one is respectively equipped on seat for locking the second locking machine of relative position between the second sliding seat and the second sliding rail
Structure；Microprocessor and voice guard, the tension-compression sensor and voice guard difference are additionally provided on the balancing pole
It is connect with the microprocessor signals, microprocessor is electrically connected with power module；The tension-compression sensor is by detected drawing
Pressure value is sent to the microprocessor in real time, after the microprocessor receives the tension and compression value, by the tension and compression value and tension and compression
Value setting range value is compared, when the tension and compression value exceeds the tension and compression value setting range value, the microprocessor control
The voice guard carries out warning note.
Above-mentioned backplate surface is also provided with the annular groove that a center of circle is located on the bar axis, and the annular groove is T shape
Sliding slot slidably connects matched T-shaped slider in the annular groove, and the T-shaped slider is fixed on the balancing pole
The third locking mechanism for locking relative position between balancing pole and bottom plate is additionally provided on lower surface, on balancing pole.
Above-mentioned first locking mechanism, second locking mechanism and third locking mechanism are clamping screws.
The quantity of above-mentioned T-shaped slider be two, two T-shaped sliders respectively with the lower surface of the balancing pole upper end and
The lower surface of balancing pole lower end is mutually fixed；The third locking mechanism is clamping screw, which passes through and be opened in balance
Screw hole on bar is simultaneously threadedly coupled with screw hole, after by clamping screw precession into screw hole, the end of thread of the clamping screw
Head can hold out against the backplate surface, so that frictional force increases between the T-shaped slider and T shape sliding slot, it is flat to reach locking
The purpose of relative position between weighing apparatus bar and bottom plate.
Above-mentioned elastic drag rope winding mechanism includes cylinder and U-shaped circlip, the side wall of the cylinder and corresponding elastic drag rope
Mutually fixed, the cylinder is used to wind corresponding elastic drag rope during axially rotating around it, reaches adjusting elastic drag rope
Value of thrust purpose, the U-shaped circlip be used for after the value of thrust that cylinder adjusts the elastic drag rope, by U-shaped circlip
One elastic arm is inserted into the cylinder, another elastic arm is connected across outside the cylinder, so that the U-shaped circlip tightly blocks
The side wall of the cylinder and the elastic drag rope on cylinder lateral wall are caught, the drawing for the elastic drag rope that locking has been adjusted is reached
The purpose of force value.
The end of two elastic arms of above-mentioned U-shaped circlip is equipped with winding side.
Above-mentioned elastic drag rope is rubber band or diameter is the hairspring silk of 0.8~1.5mm.
Longitudinal direction on above-mentioned balancing pole along every first sliding rail is additionally provided with length scale.
Above-mentioned microprocessor is MSP430 single-chip microcontroller.
Beneficial effects of the present invention: in the embodiment of the present invention, a kind of demonstrator of rational mechanics equilibrium of couples is provided, is made
Used time, by screwing third locking mechanism 25 come the relative position between stable equilibrium bar 7 and bottom plate 1, in favor of equilibrium of couples
The initial stage of lecture experiment operates, and after fixing balancing pole 7, arbitrarily chooses first sliding seat 9 in 7 left side of balancing pole and puts down
One first sliding seat 9 on 7 right side of weighing apparatus bar, respectively by them along the desired position that the first sliding rail 8 adjusts, and screws the first lock
Determine mechanism 14 to be fixed, then pull the elastic drag rope 13 being connected with this two the first sliding seats 9 respectively, two elasticity are drawn
The hook 12 of 13 ends of restricting is mounted on respectively on the link 19 for being in some ipsilateral the second sliding seat 17 of balancing pole 7 with it, will
Two the second sliding seats 17 for mounting sliding hook 12 slide along the second sliding rail 16 being respectively slidably connected and determine its position, make
Two elastic drag ropes 13 it is parallel (at this moment two elastic drag ropes 13 apply the parallel and opposite power in direction to balancing pole 7 or so,
The depth of parallelism between two elastic drag ropes 13 can measure respectively the angle of they and 7 longitudinal edge of balancing pole by protractor come really
Fixed, angle is equal, can determine parallel), the second locking mechanism 18 then screwed on two the second sliding seats 17 is fixed respectively
Position of two the second sliding seats 17 on the second sliding rail 16.Then, pass through the elasticity on two parallel flexible drawstrings 13 of winding
Drawstring winding mechanism 22 adjusts the pulling force of two parallel elastic drag ropes 13, adjusted, so that two parallel elastic drag ropes
13 pulling force is equal, a pair of of couple is constructed on balancing pole 7 to realize, wherein constituting the pulling force of the elastic drag rope 13 of couple
Size can be read by the tension measurement meter 15 connected on elastic drag rope 13, and the arm of couple can be by using ruler
The distance between two elastic drag ropes 13 are measured to obtain, the pulling force of elastic drag rope 13 is multiplied with the arm of couple up to the moment of couple,
According to same principle, another pair moment of couple and the above-mentioned moment of couple contrary couple equal in magnitude are constructed on balancing pole 7, when
After two pairs of couple buildings, then third locking mechanism 25 is gently turned, to unclamp the fixed pass between balancing pole 7 and bottom plate 1
System, then due to couple to object generates be pure turning effect (pure turning effect do not need fixed rotating shaft or fulcrum etc. assist
Condition), thus under the action of above-mentioned two pairs of moments of couple contrary couple equal in magnitude, according to equilibrium of couples principle, i.e.,
Make to have unclamped third locking mechanism 25, the balancing pole 7 is also at equilibrium state, and between the bar axis 2 and sleeve 21
Active force (pressure) is not had, then verifies and demonstrates the equilibrium principle of couple；If there is effect between bar axis 2 and sleeve 21
Power (pressure) then means to be unable to reach equilibrium of couples condition there are biggish experimental error, then should be to the power of two pairs of couples
Size and direction, moment of couple size checked and adjusted, to reduce error, error is made to reach the required reasonable model of experiment
Enclosing (when error is beyond zone of reasonableness, can have biggish pressure, will lead to each bullet in annulus 3 between bar axis 2 and sleeve 21
6 unbalance stress of spring, so that drawing when pulling force suffered by some springs 6 or pressure exceed Representative errors in the reasonable scope
Pressure value setting range value, so as to cause voice guard 24 carry out warning note, with remind experimental implementation person to two pairs of couples into
Row is checked and is adjusted.).Similarly, multipair couple can also be applied on balancing pole 7 to carry out the lecture experiment of equilibrium of couples.It is comprehensive
On, the configuration of the present invention is simple is practical, can visually show abstract equilibrium of couples principle using laboratory apparatus
Come, consequently facilitating student understands the action principle of couple.
Detailed description of the invention
Fig. 1 is overlooking structure diagram of the invention；
Fig. 2 is annulus and its internal associated components enlarged diagram of the invention；
Fig. 3 is cylinder and elastic drag rope connection schematic diagram of the invention；
Fig. 4 is the structural schematic diagram that elastic drag rope has been wound on cylinder of the invention；
Fig. 5 is U-shaped clip spring structure schematic diagram of the invention；
Fig. 6 is by having wound the structural schematic diagram connected and fixed after elastic drag rope and by U-shaped circlip on cylinder of the invention.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
Referring to Fig. 1 and Fig. 2, the embodiment of the invention provides a kind of demonstrators of rational mechanics equilibrium of couples, including bottom plate
1, the bar axis 2 with 1 perpendicular of bottom plate is fixed on bottom plate 1, the bar axis 2 is arranged in sleeve set by 7 middle part of balancing pole
In 21,7 around rod axis 2 of balancing pole is enable to rotate, the middle part of the balancing pole 7 is an annulus 3, which is fixedly connected on flat
Between the top half and lower half portion of bar 7 that weigh, the sleeve 21 is located at the center of the annulus 3, and sleeve 21 and circle
It is connected by more around the circumferential equally distributed spring 6 of sleeve 21 between ring 3, is also connected on every spring 6 for measuring it
The tension-compression sensor 5 of tension and compression value；It is respectively equipped on the left and right side of the balancing pole 7 and is slided along the first of 7 longitudinal direction of balancing pole
Rail 8, also slidably connects multiple first sliding seats 9 on every first sliding rail 8 respectively, each first sliding seat 9 respectively with a bullet
Property drawstring 13 one end connection, the other end of elastic drag rope 13 is connected with hook 12；It is also respectively connected on each elastic drag rope 13
It 15 and is connected with for by the method for coiled elastic drawstring 13 based on tension measurement by measuring 13 value of thrust of elastic drag rope
To adjust the elastic drag rope winding mechanism 22 of 13 value of thrust of elastic drag rope；It further respectively has on each first sliding seat 9 for locking
The first locking mechanism 14 of relative position between fixed first sliding seat 9 and the first sliding rail 8；The left and right ends of the bottom plate 1 are also divided
Not She Zhi one second sliding rail 16, multiple second sliding seats 17 are slidably connected on every second sliding rail 16 respectively, each second is sliding
One is respectively equipped on dynamic seat 17 makes the link 19 linked up with 12 hanging buckles thereon and one for locking the second sliding seat 17 and second
The second locking mechanism 18 of relative position between sliding rail 16；Microprocessor 23 and audible alarm are additionally provided on the balancing pole 7
Device 24, the tension-compression sensor 5 and voice guard 24 are connect with 23 signal of microprocessor respectively, microprocessor 23 with
Power module electrical connection；Detected tension and compression value is sent to the microprocessor 23 by the tension-compression sensor 5 in real time, described
After microprocessor 23 receives the tension and compression value, the tension and compression value is compared with tension and compression value setting range value, when the drawing
Pressure value exceed the tension and compression value setting range value when, the microprocessor 23 control the voice guard 24 carry out alarm mention
Show.
It referring to attached drawing 1, is adjusted, the exceptionally straight elastic drag rope 13 in the upper left corner in figure is made to generate pulling force f1, the lower right corner
Exceptionally straight elastic drag rope 13 generates pulling force-f1, power f1With-f1A pair of of couple is constituted, this makes balancing pole 7 generate the inverse time couple
Needle rotation effect, and the pulling force f that the exceptionally straight elastic drag rope 13 in the lower left corner generates2What the elastic drag rope 13 exceptionally straight with the upper right corner generated
Pulling force-f2Another pair couple is constituted, the couple is for balancing by power f1With-f1The couple of composition and act on balancing pole 7, make
It obtains the generation of balancing pole 7 and rotates clockwise effect, under the action of above-mentioned two pairs of couples, so that balancing pole 7 remains static；By
Then equilibrium of couples, therefore, theoretically the pressure between the bar axis 2 and sleeve 21 without interaction exists, i.e., the described bar axis 2
The fulcrum as lever moment is not used as in the state that balancing pole 7 is in moment of couple balance and there is (general thick stick
Stick force square fulcrum is stress), therefore by whether having more than the pressure of experimental error value just between detection bar axis 2 and sleeve 21
Be able to verify that couple experiment in balancing pole 7 whether be in equilibrium of couples state.
Further, 1 surface of bottom plate is also provided with the annular groove 20 that a center of circle is located on the bar axis 2, described
Annular groove 20 is T shape sliding slot, slidably connects matched T-shaped slider 10, the T-shaped slider in the annular groove 20
10 are fixed on the lower surface of the balancing pole 7, are additionally provided on balancing pole 7 for locking opposite position between balancing pole 7 and bottom plate 1
The third locking mechanism 25 set.
Further, the first locking mechanism 14, second locking mechanism 18 and third locking mechanism 25 are locking
Bolt.
Further, the quantity of the T-shaped slider 10 is two, and two T-shaped sliders 10 are respectively and on the balancing pole 7
The lower surface of 7 lower end of lower surface and balancing pole at end is mutually fixed；The third locking mechanism 25 is clamping screw, the locking screw
Bolt passes through the screw hole being opened on balancing pole 7 and is threadedly coupled with screw hole, described after by clamping screw precession into screw hole
The threaded end of clamping screw can hold out against 1 surface of bottom plate, so that rubbing between the T-shaped slider 10 and T shape sliding slot
It wipes power to increase, achievees the purpose that lock relative position between balancing pole 7 and bottom plate 1.
Further, referring to Fig. 3-Fig. 6, the elastic drag rope winding mechanism 22 includes cylinder 22-1 and U-shaped circlip 22-2,
The side wall of the cylinder 22-1 is fixed with corresponding 13 phase of elastic drag rope, and the cylinder 22-1 is used in the mistake axially rotated around it
Corresponding elastic drag rope 13 is wound in journey, achievees the purpose that the value of thrust for adjusting elastic drag rope 13, the U-shaped circlip 22-2 are used for
After the value of thrust that cylinder 22-1 adjusts the elastic drag rope 13, an elastic arm of U-shaped circlip 22-2 is inserted into the cylinder
In body 22-1, another elastic arm is connected across outside the cylinder 22-1, is stated so that U-shaped circlip 22-2 is tightly clamped residence
The side wall of cylinder 22-1 and the elastic drag rope 13 on cylinder 22-1 side wall reach the elastic drag rope 13 that locking has been adjusted
Value of thrust purpose；Note that enough detailed rules and regulations that the diameter of the cylinder 22-1 is done can be reduced experimental error, such as can be by cylinder
The diameter of body 22-1 accomplishes 1.5~3mm, then the U-shaped circlip 22-2 can be used reinforcing wire and bend, and reinforcing wire should be able to
It is inserted into cylinder 22-1 internal diameter.
Further, referring to Fig. 5, the end of two elastic arms of the U-shaped circlip 22-2 is equipped with winding side 22-2-1.
Winding side 22-2-1, which is arranged, can be pulled to avoid the end of two elastic arms of U-shaped circlip 22-2 and be wound on cylinder 22-1 side wall
Elastic drag rope 13 in, avoid it from damaging elastic drag rope 13.
Further, the elastic drag rope 13 is rubber band or diameter is the hairspring silk of 0.8~1.5mm.
Further, the longitudinal direction on the balancing pole 7 along every first sliding rail 8 is additionally provided with length scale 11.Work as bullet
Property drawstring 13 it is parallel with balancing pole 7 when can by read length scale value come it is convenient determination the moment of couple arm of force size.
Further, the microprocessor 23 is MSP430 single-chip microcontroller.
The present invention provides a kind of demonstrators of rational mechanics equilibrium of couples, in use, by screwing third locking mechanism
25 come the relative position between stable equilibrium bar 7 and bottom plate 1, so that the initial stage of equilibrium of couples lecture experiment operates, fix
After balancing pole 7, first sliding seat on any first sliding seat 9 for choosing 7 left side of balancing pole and 7 right side of balancing pole
9, it respectively by them along the desired position that the first sliding rail 8 adjusts, and screws first locking mechanism 14 and is fixed, then distinguish
The elastic drag rope 13 being connected with this two the first sliding seats 9 is pulled, the hook 12 of two 13 ends of elastic drag rope is mounted respectively
In being on the link 19 of some ipsilateral the second sliding seat 17 of balancing pole 7 with it, two second of sliding hook 12 will be mounted
Sliding seat 17 slides along the second sliding rail 16 being respectively slidably connected and determines its position, so that two elastic drag ropes 13 are parallel
(at this moment two elastic drag ropes 13 apply the parallel and opposite power in direction to balancing pole 7 or so, flat between two elastic drag ropes 13
Row degree can measure respectively their angles with 7 longitudinal edge of balancing pole by protractor to determine, angle is equal, can determine
In parallel), it then screws the second locking mechanism 18 on two the second sliding seats 17 and fixes two the second sliding seats 17 respectively
Position on two sliding rails 16.Then, it is adjusted by the elastic drag rope winding mechanism 22 on two parallel flexible drawstrings 13 of winding
The pulling force of two parallel elastic drag ropes 13, it is adjusted, so that the pulling force of two parallel elastic drag ropes 13 is equal, to realize
A pair of of couple is constructed on balancing pole 7, is drawn wherein the size for constituting the pulling force of the elastic drag rope 13 of couple can pass through elasticity
The tension measurement meter 15 that is connected is read on rope 13, and the arm of couple can be measured by using ruler two elastic drag ropes 13 it
Between distance obtain, the pulling force of elastic drag rope 13 is multiplied with the arm of couple up to the moment of couple, according to same principle, in balancing pole
Another pair moment of couple and the above-mentioned moment of couple contrary couple equal in magnitude are constructed on 7, after two pairs of couples construct, then
Third locking mechanism 25 is gently turned, to unclamp the fixed relationship between balancing pole 7 and bottom plate 1, then object is produced due to couple
Raw is pure turning effect (pure turning effect does not need the subsidiary conditions such as fixed rotating shaft or fulcrum), thus in above-mentioned two pairs of power
Under the action of even square contrary couple equal in magnitude, according to equilibrium of couples principle, even if having unclamped third locking mechanism 25,
The balancing pole 7 is also at equilibrium state, and there will not be active force (pressure) between the bar axis 2 and sleeve 21, then tests
It demonstrate,proves and demonstrates the equilibrium principle of couple；If there are active force (pressure) between bar axis 2 and sleeve 21, mean exist compared with
Big experimental error is unable to reach equilibrium of couples condition, then should size to the power of two pairs of couples and direction, moment of couple size
It is checked and is adjusted, to reduce error, error is made to reach the required zone of reasonableness of experiment (when error is beyond zone of reasonableness
When, there can be biggish pressure between bar axis 2 and sleeve 21, will lead to 6 unbalance stress of each spring in annulus 3, so that
Tension and compression value setting range value when pulling force suffered by some springs 6 or pressure exceed Representative errors in the reasonable scope, thus
Voice guard 24 is caused to carry out warning note, to remind experimental implementation person to check and adjust two pairs of couples).Similarly,
Multipair couple can also be applied on balancing pole 7 to carry out the lecture experiment of equilibrium of couples.To sum up, the configuration of the present invention is simple, it is real
It is strong with property, abstract equilibrium of couples principle can be visually shown to come using laboratory apparatus, consequently facilitating student understands
The action principle of couple.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (9)
1. a kind of demonstrator of rational mechanics equilibrium of couples, including bottom plate (1), it is fixed with and bottom plate (1) surface phase on bottom plate (1)
Vertical bar axis (2), the bar axis (2) are arranged in sleeve (21) set by balancing pole (7) middle part, make balancing pole (7) can
Around rod axis (2) rotation, which is characterized in that the middle part of the balancing pole (7) is an annulus (3), which is fixedly connected on flat
It weighs between the top half and lower half portion of bar (7), the sleeve (21) is located at the center of the annulus (3), and sleeve
(21) it is connected by more around the circumferential equally distributed spring (6) of sleeve (21) between annulus (3), on every spring (6) also
It is connected with the tension-compression sensor (5) for measuring its tension and compression value；It is respectively equipped on the left and right side of the balancing pole (7) along balance
First sliding rail (8) of bar (7) longitudinal direction also slidably connects multiple first sliding seats on every first sliding rail (8) respectively
(9), each first sliding seat (9) connect with one end of an elastic drag rope (13) respectively, the other end connection of elastic drag rope (13)
There are hook (12)；It is also respectively connected based on the tension measurement by measuring elastic drag rope (13) value of thrust on each elastic drag rope (13)
(15) and be connected with for by coiled elastic drawstring (13) method come adjust elastic drag rope (13) value of thrust elasticity drawing
It restricts winding mechanism (22)；It is further respectively had on each first sliding seat (9) for locking the first sliding seat (9) and the first sliding rail
(8) first locking mechanism (14) of relative position between；One second sliding rail is also respectively set in the left and right ends of the bottom plate (1)
(16), multiple second sliding seats (17) are slidably connected on every second sliding rail (16) respectively, on each second sliding seat (17)
A link (19) and one is respectively equipped with for locking the of relative position between the second sliding seat (17) and the second sliding rail (16)
Two locking mechanisms (18)；Microprocessor (23) and voice guard (24) are additionally provided on the balancing pole (7), the tension and compression pass
Sensor (5) and voice guard (24) are connect with the microprocessor (23) signal respectively, microprocessor (23) and power supply mould
Block electrical connection；Detected tension and compression value is sent to the microprocessor (23) by the tension-compression sensor (5) in real time, described micro-
After processor (23) receives the tension and compression value, the tension and compression value is compared with tension and compression value setting range value, when the drawing
When pressure value exceeds the tension and compression value setting range value, the microprocessor (23) controls the voice guard (24) and alarms
Prompt.
2. a kind of demonstrator of rational mechanics equilibrium of couples as described in claim 1, which is characterized in that bottom plate (1) table
Face is also provided with the annular groove (20) that a center of circle is located on the bar axis (2), and the annular groove (20) is T shape sliding slot, should
It is slidably connected matched T-shaped slider (10) in annular groove (20), the T-shaped slider (10) is fixed on the balance
On the lower surface of bar (7), the third for locking relative position between balancing pole (7) and bottom plate (1) is additionally provided on balancing pole (7)
Locking mechanism (25).
3. a kind of demonstrator of rational mechanics equilibrium of couples as claimed in claim 2, which is characterized in that the first locking machine
Structure (14), second locking mechanism (18) and third locking mechanism (25) are clamping screws.
4. a kind of demonstrator of rational mechanics equilibrium of couples as claimed in claim 2, which is characterized in that the T-shaped slider
(10) quantity is two, which mutually fixes；It is described
Third locking mechanism (25) is clamping screw, the clamping screw pass through the screw hole that is opened on balancing pole (7) and with screw hole screw thread
Connection, after by clamping screw precession into screw hole, the threaded end of the clamping screw can hold out against the bottom plate (1) table
Face reaches locking balancing pole (7) and bottom plate (1) so that frictional force increases between the T-shaped slider (10) and T shape sliding slot
Between relative position purpose.
5. a kind of demonstrator of rational mechanics equilibrium of couples as described in claim 1, which is characterized in that the elastic drag rope volume
It include cylinder (22-1) and U-shaped circlip (22-2) around mechanism (22), the side wall of the cylinder (22-1) and corresponding elastic drag rope
(13) it mutually fixes, the cylinder (22-1) is used to wind corresponding elastic drag rope (13) during axially rotating around it, reaches
To the purpose for the value of thrust for adjusting elastic drag rope (13), the U-shaped circlip (22-2) is used to adjust in cylinder (22-1) described
After the value of thrust of elastic drag rope (13), an elastic arm of U-shaped circlip (22-2) is inserted into the cylinder (22-1), another
Elastic arm is connected across the cylinder (22-1) outside, so that the U-shaped circlip (22-2), which is tightly clamped residence, states cylinder (22-1)
Side wall and elastic drag rope (13) on cylinder (22-1) side wall, reach the elastic drag rope (13) that locking has been adjusted
The purpose of value of thrust.
6. a kind of demonstrator of rational mechanics equilibrium of couples as claimed in claim 5, which is characterized in that the U-shaped circlip
The end of two elastic arms of (22-2) is equipped with winding side (22-2-1).
7. a kind of demonstrator of rational mechanics equilibrium of couples as described in claim 1, which is characterized in that the elastic drag rope
(13) the hairspring silk that be rubber band or diameter is 0.8~1.5mm.
8. a kind of demonstrator of rational mechanics equilibrium of couples as described in claim 1, which is characterized in that the balancing pole (7)
On along the longitudinal direction of every first sliding rail (8) be additionally provided with length scale (11).
9. a kind of demonstrator of rational mechanics equilibrium of couples as described in claim 1, which is characterized in that the microprocessor
It (23) is MSP430 single-chip microcontroller.
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| CN110208089A (en) * | 2019-06-13 | 2019-09-06 | 深圳市特发信息股份有限公司 | Optical cable delivery disc core cylinder pressure testing machine |
| CN110319768B (en) * | 2019-07-30 | 2024-03-01 | 宁波市特种设备检验研究院 | Tool structure for measuring opening angle of elevator steel wire rope |
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| CN203982635U (en) * | 2014-06-30 | 2014-12-03 | 浙江工业大学 | A kind of teaching aid of theoretical mechanics equilibrium of couples |
| CN204029224U (en) * | 2014-07-17 | 2014-12-17 | 浙江工业大学 | Theoretical mechanics answering device |
| CN104240564A (en) * | 2014-07-17 | 2014-12-24 | 浙江工业大学 | Theoretical mechanics answer device |
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| CN206370208U (en) * | 2016-09-28 | 2017-08-01 | 刘志行 | A kind of high school physicses apparatus for demonstrating |
| CN206975886U (en) * | 2017-05-25 | 2018-02-06 | 宝鸡文理学院 | A kind of multi-functional statics demonstration teaching aid |
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| US20070190515A1 (en) * | 2006-01-24 | 2007-08-16 | Actus Potentia, Inc. | Software and method for interactive learning of engineering statics |
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