CN207663634U - A kind of center of mass motion theorem demonstrator - Google Patents
A kind of center of mass motion theorem demonstrator Download PDFInfo
- Publication number
- CN207663634U CN207663634U CN201721432007.6U CN201721432007U CN207663634U CN 207663634 U CN207663634 U CN 207663634U CN 201721432007 U CN201721432007 U CN 201721432007U CN 207663634 U CN207663634 U CN 207663634U
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- China
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- connecting rod
- fixedly connected
- fixed
- hinged
- type connecting
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Abstract
The utility model discloses a kind of center of mass motion theorem demonstrator, including conical plate, it is characterized in that：It is provided with disk on the conical plate, it is provided with bottom plate on the disk, one end of one end and one group of symmetric support bar of fixing axle is fixed on the bottom plate, the other end of supporting rod described in one group is fixed with u-bracket, two handle center's axis are respectively fixedly connected with one end of shape of chinese word Ji connecting rod across the side plate of the hinged u-bracket, circular shaft of the other end of each shape of chinese word Ji connecting rod in fixed block, the middle part of each shape of chinese word Ji connecting rod is hinged one end of L-type connecting rod, the other end of each L-type connecting rod is hinged the upper end of oscillating deck, the both sides of each oscillating deck are fixedly connected with one end of rotation axis, the other end of each rotation axis is hinged on the convex block at the u-bracket both ends, the side of each fixed block is each attached in the fixing axle.
Description
Technical field
The utility model is related to the physics teaching fields of center of mass motion theorem, in particular, it is fixed to be related to a kind of center of mass motion
Manage demonstrator.
Background technology
Center of mass motion theorem is one of physical kinetics general Theorem, can be expressed as：The center of mass motion of system of material points and one
Movement positioned at the particle of barycenter is identical, and the quality of the particle is equal to the gross mass of system of material points, and the active force on the particle is then
On this point of parallelly being moved on to equal to all external force acted on system of material points.It is not special for the teaching demonstration of the theorem at present
Instructional device.This is in place of the deficiencies in the prior art.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of center of mass motion theorem demonstrators, facilitate demonstration barycenter fortune
Dynamic theorem.
The utility model adopts the following technical solution realizes purpose of utility model：
A kind of center of mass motion theorem demonstrator, including conical plate (16), it is characterized in that：It is arranged on the conical plate (16)
There is disk (15), bottom plate (13) is provided on the disk (15), one end of fixing axle (18) is fixed on the bottom plate (13)
With one end of one group of symmetric support bar (14), the other end of supporting rod (14) described in one group is fixed with u-bracket (22), two hands
Handle (24) central shaft is respectively fixedly connected with one end of shape of chinese word Ji connecting rod (26) across the side plate of the hinged U types holder (22),
The other end of each shape of chinese word Ji connecting rod (26) is hinged on the circular shaft (19) of fixed block (20), each shape of chinese word Ji connecting rod
(26) middle part is hinged one end of L-type connecting rod (25), and the other end of each L-type connecting rod (25) is hinged oscillating deck (21)
The both sides of upper end, each oscillating deck (21) are fixedly connected with one end of rotation axis (21a), each rotation axis (21a)
The other end is hinged on the convex block at the u-bracket (22) both ends, and each the side of the fixed block (20) is each attached to described
In fixing axle (18), the other end of the fixing axle (18) passes through the bearing (27) being fixedly connected and consolidates with the bearing (27)
Fixed circular groove (17) is fixedly connected with support plate (4), and the both sides of the circular groove (17), which are fixed, is connected to symmetrical sliding slot (5), each described
One end of sliding slot (5) inner wall is fixedly connected with one end of spring (2), and the other end of the spring (2) is fixedly connected with the one of ball (3)
Side, the other side of each ball (3) are fixedly connected with one end of rope (6), and the other end of the rope (6) is fixed on described
In fixing axle (18), cylinder (8) is provided on the support plate (4), the piston rod of the cylinder (8) is fixedly connected with motor
(10), the output shaft of the motor (10) is fixedly connected at the center of U type connecting rod (11).
It is further limited as to the technical program, the lower end of each oscillating deck (21) is fixedly connected with swing ball
(12)。
It is further limited as to the technical program, each sliding slot (5) both sides upper surface is fixed V-type and connected respectively
The both ends of fishplate bar (7), the both ends of the U type connecting rod (11) are individually positioned in the not ipsilateral of two sliding slots (5).
Compared with prior art, the advantages of the utility model and good effect is：The present apparatus is positioned on the water surface, is loosened
Tight fixed bolt, while two handles are rotated, it drives two shape of chinese word Ji connecting rods to be drawn close to centre, oscillating deck is driven by L type connecting rods
Upper end is drawn close to central rotational, then the lower end of oscillating deck drives swing ball to be swung up, and two angles for swinging balls increase, and are adjusted to
After suitable position, tightens tight fixed bolt and withstand the side plate of u-bracket and fix two handles, and then the angle for fixing two swing balls is big
Small, after adjustment, cylinder and motor running, motor rotation drive U type connecting rod to move in a circle, and the piston rod of cylinder is shunk
When, drive motor to move down, one end of the L-type connecting rod of motor both sides connection is moved down along targeting port, the bar meeting at U type connecting rod both ends
It moving down and is close to V-type connecting plate to drive circle and the rotation of symmetrical sliding slot when U type connecting rod rotation, this is rotated forward for device, by
It is fixed in fixing axle, so two ropes of fixing axle both sides connection can be wrapped in fixing axle, two ropes lead to respectively
It crosses ball and elongates spring, spring is made to be in tensional state, when the elongation of the piston rod of cylinder, pushing motor moves up, motor
One end of the L-type connecting rod of both sides connection is moved up along targeting port, and the bar at U type connecting rod both ends will be shifted up, at this time U type connecting rod both ends
Bar do not contacted with V-type connecting plate, two spring contractions reset, by ball drive rope rotate backward disengaging fixing axle, to
Drive circular groove and symmetrical sliding slot to be rotated to negative direction, this is rotated backward for device, record rotate forward with it is counter-rotational when
Between, the step of two handle of repeated rotation, continues to increase two angles for swinging balls, and after repeating the above steps, record increases two and swings balls
The time for rotating forward and inverting after angle, two swing ball chuck angles are bigger, rotate forward and counter-rotational velocity variable
Greatly, two to swing ball chuck angles smaller, rotate forward it is small with counter-rotational velocity variable, according to the law of conservation of momentum, two circles
Ball generates counter motion with the contraction of spring respectively and finally tends to be static, the system conservation of momentum which is demonstrated, system
Centroid position remains unchanged before and after movement, demonstrates center of mass motion theorem, is grasped with this to complete the demonstration of center of mass motion theorem
Make.The utility model is easy to operate, structure novel, the demonstration center of mass motion theorem that can be accurately illustrated.
Description of the drawings
Fig. 1 is the stereogram one of the utility model.
Fig. 2 is the stereogram two of the utility model.
Fig. 3 is the front view of the utility model.
Fig. 4 is the part-structure schematic diagram of the utility model.
Fig. 5 is the stereogram three of the utility model.
Fig. 6 is the side view of the utility model.
Fig. 7 is the partial enlarged view of A in the utility model Fig. 4.
In figure：1, L-type plate, 2, spring, 3, ball, 4, support plate, 5, sliding slot, 6, rope, 7, V-type connecting plate, 8, gas
Cylinder, 8a, targeting port, 9, L-type connecting rod, 10, motor, 11, U type connecting rod, 12, swing ball, 13, bottom plate, 14, supporting rod, 15,
Disk, 16, conical plate, 17, circular groove, 18, fixing axle, 19, circular shaft, 20, fixed block, 20a, connecting plate, 21, oscillating deck, 21a,
Rotation axis, 22, u-bracket, 23, tight fixed bolt, 24, handle, 25, L-type connecting rod, 26, shape of chinese word Ji connecting rod, 27, bearing.
Specific implementation mode
Below in conjunction with the accompanying drawings, a specific implementation mode of the utility model is described in detail, it is to be understood that this
The protection domain of utility model is not restricted by specific implementation.
As shown in Fig. 1-Fig. 7, the utility model includes conical plate 16, and disk 15 is provided on the conical plate 16, described
Bottom plate 13 is provided on disk 15, be fixed on the bottom plate 13 fixing axle 18 one end and one group of symmetric support bar 14 one
End, the other end of supporting rod 14 described in one group are fixed with u-bracket 22, and two handles, 24 central shaft passes through the hinged U-shaped branch
The side plate of frame 22 is respectively fixedly connected with one end of shape of chinese word Ji connecting rod 26, and the other end of each shape of chinese word Ji connecting rod 26 is hinged on admittedly
Determine the circular shaft 19 of block 20, the middle part of each shape of chinese word Ji connecting rod 26 is hinged one end of L-type connecting rod 25, each L-type connecting rod
25 other end is hinged the upper end of oscillating deck 21, and the both sides of each oscillating deck 21 are fixedly connected with one end of rotation axis 21a, often
The other end of a rotation axis 21a is hinged on the convex block at 22 both ends of the u-bracket, the side of each fixed block 20
Be each attached in the fixing axle 18, the other end of the fixing axle 18 pass through the bearing 27 being fixedly connected and with the bearing 27
Fixed circular groove 17 is fixedly connected with support plate 4, and the both sides of the circular groove 17, which are fixed, is connected to symmetrical sliding slot 5, in each sliding slot 5
One end of wall is fixedly connected with one end of spring 2, and the other end of the spring 2 is fixedly connected with the side of ball 3, each circle
The other side of ball 3 is fixedly connected with one end of rope 6, and the other end of the rope 6 is fixed in the fixing axle 18, the support
Cylinder 8 is provided on plate 4, the piston rod of the cylinder 8 is fixedly connected with motor 10, and the output shaft of the motor 10 is fixedly connected with U
At the center of type connecting rod 11.
The other side of each fixed block 20 is fixedly connected with the u-bracket 22 by connecting plate 20a.
It is threadedly coupled tight fixed bolt 23 on the plectane of each handle 24.
The lower end of each oscillating deck 21, which is fixedly connected with, swings ball 12.
The both sides of the motor 10 are respectively fixedly connected with one end of L-type connecting rod 9, and each the L-type connecting rod 9 is another
End is respectively embedded into the targeting port 8a on the L-type plate 1 for being fixed on the support plate 4.
The both ends of V-type connecting plate 7, the both ends of the U type connecting rod 11 are fixed in each 5 both sides upper surface of the sliding slot respectively
It is individually positioned in the not ipsilateral of two sliding slots 5.
The workflow of the utility model is：The present apparatus is positioned on the water surface, loosens tight fixed bolt 23, while rotating two
Handle 24 drives two shape of chinese word Ji connecting rods 26 to be drawn close to centre, drives the upper end of oscillating deck 21 to turn to centre by L-type connecting rod 25
Dynamic to draw close, then the lower end of oscillating deck 21 drives swing ball 12 to be swung up, and two angles for swinging balls 12 increase, and are adjusted to suitable position
It postpones, tightens tight fixed bolt 23 and withstand the side plate of u-bracket 22 and fix two handles 24, and then fix the folder of two swing balls 12
Angle size, after adjustment, cylinder 8 and motor 10 operate, and motor 10 rotates, and drive U type connecting rod 11 to move in a circle, cylinder 8
Piston rod shrink when, drive motor 10 move down, 10 both sides of motor connection L-type connecting rod 9 one end under targeting port 8a
It moves, the bar at 11 both ends of U type connecting rod, which can move down, is close to V-type connecting plate 7 so that circular groove 17 be driven to be slided with symmetrical when U type connecting rod 11 rotates
Slot 5 rotates, this is rotated forward for device, since fixing axle 18 is fixed, so two ropes of 18 both sides of fixing axle connection
Son 6 can be wrapped in fixing axle 18, and two ropes 6 elongate spring 2 by ball 3 respectively, and spring 2 is made to be in tensional state, when
When the piston rod elongation of cylinder 8, pushing motor 10 moves up, and one end of the L-type connecting rod 9 of 10 both sides of motor connection is along leading
It being moved up to mouth 8a, the bar at 11 both ends of U type connecting rod will be shifted up, and the bar at 11 both ends of U type connecting rod is not contacted with V-type connecting plate 7 at this time, and two
2 retracted for clearance of spring drives rope 6 to rotate backward and is detached from fixing axle 18, to drive circular groove 17 and symmetrical sliding slot by ball 3
5 rotate to negative direction, this is rotated backward for device, and record rotates forward and counter-rotational time, two handle of repeated rotation
24 the step of, continues to increase two angles for swinging ball 12, after repeating the above steps, after two swing 12 angles of ball of record increasing just
To the time of rotation and reversion, two swing 12 angles of ball are bigger, rotate forward, two swings big with counter-rotational velocity variable
12 angle of ball is smaller, rotates forward small with counter-rotational velocity variable, and according to the law of conservation of momentum, two balls 3 are distinguished
Counter motion is generated with the contraction of spring 2 and finally tends to be static, and the system conservation of momentum which is demonstrated, system is moving
Front and back centroid position remains unchanged, and demonstrates center of mass motion theorem, and the demonstration operation of center of mass motion theorem is completed with this.
Disclosed above is only a specific embodiment of the utility model, and still, the utility model is not limited to this,
The changes that any person skilled in the art can think of should all fall into the scope of protection of the utility model.
Claims (3)
1. a kind of center of mass motion theorem demonstrator, including conical plate (16), it is characterized in that：It is provided with circle on the conical plate (16)
Disk (15) is provided with bottom plate (13) on the disk (15), one end and one of fixing axle (18) is fixed on the bottom plate (13)
One end of group symmetric support bar (14), the other end of supporting rod (14) described in one group are fixed with u-bracket (22), two handles (24)
Central shaft is respectively fixedly connected with one end of shape of chinese word Ji connecting rod (26), Mei Gesuo across the side plate of the hinged u-bracket (22)
The other end for stating shape of chinese word Ji connecting rod (26) is hinged on the circular shaft (19) of fixed block (20), in each shape of chinese word Ji connecting rod (26)
Portion is hinged one end of L-type connecting rod (25), and the other end of each L-type connecting rod (25) is hinged the upper end of oscillating deck (21), each
The both sides of the oscillating deck (21) are fixedly connected with one end of rotation axis (21a), and the other end of each rotation axis (21a) is hinged
On the convex block at the u-bracket (22) both ends, the side of each fixed block (20) is each attached to the fixing axle (18)
On, the other end of the fixing axle (18) pass through the bearing (27) being fixedly connected and with the bearing (27) fixed circular groove (17)
It is fixedly connected with support plate (4), the both sides of the circular groove (17), which are fixed, is connected to symmetrical sliding slot (5), each sliding slot (5) inner wall
One end is fixedly connected with one end of spring (2), and the other end of the spring (2) is fixedly connected with the side of ball (3), each circle
The other side of ball (3) is fixedly connected with one end of rope (6), and the other end of the rope (6) is fixed in the fixing axle (18),
Cylinder (8) is provided on the support plate (4), the piston rod of the cylinder (8) is fixedly connected with motor (10), the motor (10)
Output shaft be fixedly connected at the center of U type connecting rod (11).
2. center of mass motion theorem demonstrator according to claim 1, it is characterized in that：The lower end of each oscillating deck (21)
It is fixedly connected with and swings ball (12).
3. center of mass motion theorem demonstrator according to claim 1, it is characterized in that：Each sliding slot (5) both sides upper table
The both ends of V-type connecting plate (7) are fixed in face respectively, and the both ends of the U type connecting rod (11) are individually positioned in two sliding slots (5) no
Ipsilateral.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721432007.6U CN207663634U (en) | 2017-10-31 | 2017-10-31 | A kind of center of mass motion theorem demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721432007.6U CN207663634U (en) | 2017-10-31 | 2017-10-31 | A kind of center of mass motion theorem demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207663634U true CN207663634U (en) | 2018-07-27 |
Family
ID=62937531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721432007.6U Expired - Fee Related CN207663634U (en) | 2017-10-31 | 2017-10-31 | A kind of center of mass motion theorem demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207663634U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107578678A (en) * | 2017-10-31 | 2018-01-12 | 济南大学 | A kind of center of mass motion theorem demonstrator |
-
2017
- 2017-10-31 CN CN201721432007.6U patent/CN207663634U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107578678A (en) * | 2017-10-31 | 2018-01-12 | 济南大学 | A kind of center of mass motion theorem demonstrator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180727 Termination date: 20191031 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |