CN207268907U - New angular momentum conservation demonstration and quantitative determination experiment instrument - Google Patents
New angular momentum conservation demonstration and quantitative determination experiment instrument Download PDFInfo
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- CN207268907U CN207268907U CN201720652957.3U CN201720652957U CN207268907U CN 207268907 U CN207268907 U CN 207268907U CN 201720652957 U CN201720652957 U CN 201720652957U CN 207268907 U CN207268907 U CN 207268907U
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Abstract
New angular momentum conservation demonstration and quantitative determination experiment instrument are the utility model is related to, including：Support leg, base, leveling spirit bubble, fixation hollow support column, lower wheel shaft, upper whorl axial, hollow center shaft, hollow drum, photoelectric door, positive conductive brush, negative conductive brush, circular small machine, turntable, machine shaft, motor transfer bus, the first transmission line, the second transmission line and electric cabinet.Three leveling support legs are set under base, leveling spirit bubble is provided with base, base center sets fixation hollow support column, hollow center shaft is set among fixation hollow support column, hollow center rotating shaft support column is fixedly connected with hollow center shaft upper end, hollow center rotating shaft support column is alternate successively from down to up to be fixedly mounted photoelectric door, positive conductive brush and negative conductive brush.The beneficial effects of the utility model are：Improved New experiment instrument has directly removed lower wheel disc, and experiment instrument is overall not only light and handy, but also saves material.
Description
Technical field
The utility model patent is related to experiment instrument, more particularly to a kind of new angular momentum conservation demonstration is tested with quantitative determination
Instrument.
Background technology
The existing angular momentum conservation demonstration instrument in physics laboratory, is passively to demonstrate, main presentation format has：First, hand push
Formula, is that pivot link and steel ball are maximum (state 1) away from shaft distance when will hold handle with hand to pull down, and artificially allows pivot link
With steel ball quick rotation, then, hold lever and above push away, pivot link is reduced (state 2) away from shaft distance with steel ball, shape
State 1 is big compared with 2 rotation system rotary inertia of state, since rotation system bonding force square is zero, the conservation of angular momentum, so last current state
(state 2) rotation system angular speed increases, i.e. faster rotational speed；Second, demonstrating the method for the conservation of angular momentum is, a people is sitting in chair
Upper two hands take dumbbell, allow chair to rotate, and the fast of chair rotation is demonstrated by stretching two arms for holding dumbbell hand
Slowly, even two arm stretching, extensions rotate slack-off, and two arms, which retract to rotate, adds block；3rd：One people station can be freely rotated one
On turntable, hand is lifted so as to the runner being freely rotated, then, rotates upborne runner, free turntable will produce and runner
The opposite rotation of rotation direction.Based on this, inventor, which has invented, can not only demonstrate, but can quantitative measurment prove the conservation of angular momentum
Laboratory apparatus, applied in September in 2016 to Patent No. within 28th：ZL 201521032868.6 " conservation of angular momentum is drilled
Show and quantitative determination experiment instrument ".But the experiment instrument is when specifically used or inconvenient, especially motor supply lines, turn
Dynamic system communications line is laid out outside hollow drum, and photoelectric door, conducting ring and conduction brush are separately designed in base with
Lower disk surface, not only apparatus structure complexity is in disorder, but also it is very inconvenient to operate.
Utility model content
In order to overcome the shortage of prior art, the utility model provides a kind of new angular momentum conservation demonstration rational in infrastructure
With quantitative determining experiment instrument.
To realize above-mentioned technical purpose, the utility model employs following technical scheme：
This new angular momentum conservation demonstration and quantitative determination experiment instrument, including it is support leg, base, leveling spirit bubble, solid
Determine hollow support column, lower wheel shaft, upper whorl axial, hollow center shaft, hollow drum, photoelectric door, positive conductive brush, negative conductive
Brush, circular small machine, turntable, machine shaft, motor transfer bus, the first transmission line, the second transmission line and electric cabinet；
Three leveling support legs are set under base, leveling spirit bubble is provided with base, base center sets fixation hollow
Support column, among fixation hollow support column set hollow center shaft, be fixedly connected in hollow center shaft upper end it is hollow in
Heart rotating shaft support column, hollow center rotating shaft support column is alternate successively from down to up to be fixedly mounted photoelectric door, positive conductive brush and bears
Pole conduction brush, positive conductive ring are fixed on hollow drum using two insulated columns are corresponding with positive conductive brush, negative conductive ring
It is fixed on using two insulated columns are corresponding with negative conductive brush on hollow drum, respectively under positive conductive ring and negative conductive ring
Two conducting wires are welded through hollow drum eye position to hollow drum appearance in end, are close to hollow drum appearance and circular small machine is positive and negative
Binding post connects；
Circular small machine is fixed on hollow drum upper end, and turntable is fixed with machine shaft；Hollow drum with hollow turn
Axis is rotatablely connected using upper whorl axial and lower wheel shaft, and the inner edge of upper whorl axial is consolidated with hollow rotating shaft outer surface respectively with lower wheel shaft inner edge
Fixed connection, the outer rim of upper whorl axial are fixedly connected with hollow drum inner surface respectively with the outer rim of lower wheel shaft, and at this time, the bar that is in the light can
Pass freely through and be in the light between transmitting photoelectric door and reception photoelectric door, the contact brush of positive conductive brush coincide with positive conductive ring to be connect
Touch, the contact brush of negative conductive brush coincide with negative conductive ring to be contacted；
Electric cabinet is conductive for positive conductive brush and negative conductive brush by power transmission line, and the contact brush of positive conductive brush is just
Sliding conduction on the conducting ring of pole, the contact brush of the negative conductive brush sliding conduction on negative conductive ring, supplies for circular small machine
Electricity, circular small machine drive turntable to rotate；
Hollow drum is rotated together with the positive conductive ring for being fixed therein side with negative conductive ring, positive conductive brush and
Negative conductive brush is conductive with positive conductive ring and the sliding contact of negative conductive ring respectively.
As preferred：The transmitting photoelectric door transmission line of the photoelectric door and receive photoelectric door transmission line through the second transmission line,
First transmission line imports motor transfer bus and enters electric cabinet.
The utility model has the characteristics that following and beneficial effect：
1st, the utility model patent is to Patent No.：ZL 201521032868.6 " angular momentum conservation demonstration with it is quantitative
Determination experiment instrument " patent drawback, which has, pointedly to be improved.Position is improved to be related to：(1) motor supply lines；(2) rotate
The layout of system communications line；(3) position of photoelectric door, conducting ring and conduction brush and size；
2nd, improved New experiment instrument has directly removed lower wheel disc, and experiment instrument is overall not only light and handy, but also saves material；
3rd, New experiment instrument moves change respectively by inside and outside conducting ring on base and lower wheel disc lower surface conduction brush and photoelectric door
It is filled between central rotating shaft support column and hollow drum, both safety, appearance is overall and beautiful beautiful；
4th, hollow center rotating shaft support column and hollow center shaft different-diameter are employed, can be by annulus conduction brush with realization
It is installed on photoelectric door in hollow center shaft, and positive conductive ring, negative conductive ring and the bar that is in the light is installed on hollow drum
Inner side, is very ingenious to realize that photoelectric information transmits；
5th, as described above, improved " the new conservation of angular momentum and quantitative determination experiment instrument ", the experiment instrument invented earlier above,
Photoelectric information transmission layout is more reasonable.
Brief description of the drawings
Fig. 1 is the conservation of angular momentum and quantitative determination experiment instrument full figure.
Fig. 2 is hollow drum, upper and lower wheel shaft outer rim and motor connecting structure.
Shaft, upper and lower wheel shaft and hollow drum sectional view centered on Fig. 3.
Fig. 4 is photoelectric door, conduction brush and conducting ring and transmission line connection structure diagram.
Fig. 5 is annulus conduction map brushing.
Fig. 6 is conduction brush and conducting ring figure.
Fig. 7 is photoelectric door figure.
Fig. 8 is base and electric cabinet figure.
Embodiment
The utility model is described further with reference to embodiment.The explanation of following embodiments is only intended to help and manages
Solve the utility model.It should be pointed out that for those skilled in the art, the utility model principle is not being departed from
On the premise of, some improvement and modification can also be carried out to the utility model, these are improved and modification also falls into the utility model
In scope of the claims.
As shown in Figure 1, it is the new conservation of angular momentum and quantitative determination experiment instrument full figure.1st, leveling support leg, 2, base, 3,
Leveling spirit bubble, 4, fixation hollow support column, 5, lower wheel shaft, 7, upper whorl axial, 6, hollow center shaft, 6-0, hollow center shaft
Fixed support column, 8, hollow drum, 9, photoelectric door, 10, conduction brush, 10-4, conducting ring and motor connecting wire, 12, circular small
Motor, 13, turntable, 14, machine shaft, 16, motor transfer bus, the 17, first transmission line, the 18, second transmission line, 15, automatically controlled
Case, 15-0, electric cabinet master switch, 15-1, electric cabinet indicator light, 15-2, photoelectric door controlling switch, 15-3, motor control switch,
More than 15-4, hollow drum overall rotating speed shows fluorescent screen, and 15-5, motor speed show fluorescent screen；
Shaft, upper and lower wheel shaft and hollow drum sectional view centered on as shown in figure 3,.5th, lower wheel shaft, 5-1, lower wheel shaft pearl
Son, 5-2, lower wheel shaft inner edge, 5-3, lower wheel shaft outer rim, 6, hollow center shaft, 7, upper whorl axial, 7-1, upper whorl axial pearl, 7-2,
Upper whorl axial inner edge, 7-3, upper whorl axial outer rim, 8, hollow drum；
As shown in figure 4, it is photoelectric door, conduction brush and conducting ring and transmission line connection structure diagram.6th, hollow center shaft, 6-
0th, hollow center rotating shaft support column, 7, upper whorl axial, 8, hollow drum, 9, photoelectric door, 10, positive conductive brush, 11, negative conductive
Brush, 10-0, positive conductive ring, 11-0, negative conductive ring, 12, circular small machine；
As shown in figure 5, it is annulus conduction brush.10th, annulus conduction brush, 100, conducting wire, 110, with lower wheel disc fixing end, 120,
Spring, 130, inner hollow column, 140, overcoat open tubular column, 150, contact brush；
As shown in fig. 6,10-10, insulated column；
As shown in fig. 7, it is photoelectric door structure chart.9th, photoelectric door, 9-0, be in the light bar, 9-20, transmitting photoelectric door transmission line, 9-
30th, photoelectric door transmission line is received.
Photoelectric door and the specific connection structure of electric cabinet and display screen
Transmitting photoelectric door transmission line 9-20 and reception are pulled out from the transmitting photoelectric door 9-2 and reception photoelectric door 9-3 of photoelectric door 9
Photoelectric door transmission line 9-30 enters in hollow center rotating shaft support column through support column lower part, imports photoelectric door, motor power supply second
Transmission line 18, the first transmission line 17, then motor power supply is imported with photoelectricity door motor transfer bus 16, finally accessing electric cabinet
Interior relevant position.
The light that transmitting photoelectric door 9-2 spot light lamp bulbs in photoelectric door 9 are sent, the aperture before received photoelectric door 9-3 connect
Receipts are irradiated to photosensitive tube, and when electric cabinet 15, which opens photoelectric door 9, to work, hollow drum 8 rotates, and drive bar 9-0 rotations of being in the light, tool
Between there are the emitted photoelectric door 9-2 of the bar 9-0 that is in the light of certain thickness and receiving photoelectric door 9-3, launch the light that photoelectric door 9-2 is sent
When being blocked, timer starts timing, when photoelectric door 9 is in the light again timing terminate, 9 transmission line of photoelectric door will believe these
Breath is transmitted to electric cabinet 15, and 15 time set of electric cabinet possesses calculation function, will calculate 8 rotating speed n of hollow drum, at the same time meeting
Shown on the fluorescent screen 15-4 of electric cabinet 15, motor speed n1Also can be shown on the fluorescent screen 15-5 of electric cabinet 15
Out.
The specific connection structure of motor and electric cabinet and display screen
Electric cabinet 15 is that the circular power supply of small machine 12 is respectively in cathode by positive conductive brush 10 and negative conductive brush 11
Sliding contact is realized on conducting ring 10-0 and negative conductive ring 11-0, from positive conductive ring 10-0 and negative conductive ring 11-0
Pick out conducting wire 10-4 to be connected on the positive and negative terminal of circular small machine 12, the positive and negative polarity wire pulled out from electric cabinet 15 is through motor
Transfer bus 16, through the first transmission line 17, the second transmission line 18, be respectively connected to positive conductive brush 10 and negative conductive brush 11
Terminal.Circular 12 rotating speed n of small machine1It can be shown by 15 fluorescent screen 15-5 of electric cabinet.
Annulus conduction brush operation principle
Annulus conduction brush 10 is installed on hollow center rotating shaft support column 6-0, and contact brush 150 is just in conducting ring 10-0
On, spring 120 is compressed, and overcoat open tubular column 140 is retracted, and conducting wire 100 relative telescopic can change in inner hollow column 130, hollow
Rotating cylinder 8, which rotates, drives positive conductive ring 10-0 and negative conductive ring 11-0 to rotate, and positive negative brush 150 can be respectively in positive conductive ring
Sliding contact is conductive on 10-0 and negative conductive ring 11-0, and electric current can be by conduction brush 150 through positive conductive ring 10-0 and anode
Conducting ring 11-0 is that circular small machine 12 is powered, and the rotating speed n of hollow drum 8 can show glimmering in the overall rotating speed of hollow drum more than 8
Shown on optical screen 15-4.
The connection mode of each several part link
Three leveling support legs 1 of setting of base 2 times, are provided with leveling spirit bubble 3,2 centrally disposed fixation of base on base 2
Hollow support column 4, sets hollow center shaft 6 among fixation hollow support column 4, is connected one in 6 upper end of hollow center shaft
The less hollow center rotating shaft support column 6-0 of diameter, the alternate fixation successively from down to up on hollow center rotating shaft support column 6-0
Photoelectric door 9, positive conductive brush 10 and negative conductive brush 11, the transmitting photoelectric door transmission line 9-20 and reception light of photoelectric door 9 are installed
Electric switch transmission line 9-30 imports motor transfer bus 16 through the second transmission line 18, the first transmission line 17 and enters electric cabinet, and cathode is led
Electric ring 10-0 is fixed on hollow drum 8 using two insulated column 10-10 are corresponding with positive conductive brush 10, negative conductive ring 11-
0 is fixed on hollow drum 8 using two insulated column 11-10 are corresponding with negative conductive brush 11, respectively from positive conductive ring 10-0
Two conducting wires are welded through 8 positions of hollow drum to 8 appearance of hollow drum with negative conductive ring 11-0 lower ends, are close to hollow drum
8 appearances are connected with circular 12 positive negative terminal of small machine；Circular small machine 12 is fixed on 8 upper end of hollow drum, in machine shaft
A turntable 13 is fixed on 14；Hollow drum 8 with hollow rotating shaft 6 is rotatablely connected using upper whorl axial 7 and lower wheel shaft 5, upper whorl axial 7
Inner edge 7-2 is fixedly connected with 6 outer surface of hollow rotating shaft respectively with lower wheel shaft inner edge 5-2, the outer rim 7-3 of upper whorl axial 7 and lower wheel shaft 5
Outer rim 5-3 be fixedly connected respectively with 8 inner surface of hollow drum, at this time, the bar 9-0 that is in the light can pass freely through transmitting photoelectric door 9-
It is in the light between 2 and reception photoelectric door 9-3, the contact brush 150 of positive conductive brush 10 coincide with positive conductive ring 10-0 to be contacted, anode
The contact brush 150 of conduction brush 11 coincide with negative conductive ring 11-0 to be contacted；Electric cabinet 15 is positive conductive brush by power transmission line
10 and negative conductive brush 11 it is conductive, the contact brush 150 of positive conductive brush 10 sliding conduction, anode on positive conductive ring 10-0
The contact brush 150 of conduction brush 11 sliding conduction on negative conductive ring 11-0, to power for circular small machine 12, circular small electricity
Machine 12 drives turntable 13 to rotate, its rotating speed n1It can show in the motor speed of electric cabinet 15 and be shown on fluorescent screen 15-5；According to
Understood according to angular momentum conservation law, more than 8 integral part of hollow drum (including circular small machine, turntable and positive and negative anodes conducting ring
And upper and lower wheel shaft outer ring) can be rotated along rotate opposite direction with turntable 13, hollow drum 8 carries bar 9-0 rotations of being in the light, and keeps off
It is in the light between transmitting photoelectric door 9-2 and reception photoelectric door 9-3 that polished rod 9-0 can be Jing Guo photoelectric door 9, transmitting photoelectric door transmission line 9-20
With the photoelectric door transmission line 9-30 information that will can be in the light is received motor transfer bus is imported through the second transmission line 18, the first transmission line 17
16, and be connected with 15 corresponding site of electric cabinet, such more than 8 integral part of hollow drum (including circular small machine, turntable with
Positive and negative anodes conducting ring and upper and lower wheel shaft outer ring) rotating speed n will electric cabinet 15 more than 8 integral part of hollow drum (including
Circular small machine, turntable and positive and negative anodes conducting ring and upper and lower wheel shaft outer ring) rotating speed show and shown on fluorescent screen 15-4；
Hollow drum 8 is rotated together with the positive conductive ring 10-0 and negative conductive ring 11-0 for being fixed therein side, positive conductive brush
10 and negative conductive brush 11 will be conductive with positive conductive ring 10-0 and negative conductive ring 11-0 sliding contacts respectively.
Laboratory operating procedures and principle
1st, laboratory apparatus, leveling base 2 are got out；
2nd, 15 power supply of electric cabinet is connected, connects 15 master switch 15-0 of electric cabinet, 15 indicator light 15-1 of electric cabinet is bright, opens circle
12 controlling switch 15-3 of shape small machine, machine shaft 14 drive turntable 13 to start to rotate, and machine shaft 14 drives 13 rotating speed of turntable
n1It will be read on motor speed display fluorescent screen 15-5；
3rd, 9 controlling switch 15-2 of photoelectric door is opened, according to angular momentum conservation law, more than 8 integral part of hollow drum (bag
Include circular small machine, turntable and positive and negative anodes conducting ring and upper and lower wheel shaft outer ring) it will be rotated along the direction opposite with turntable 13,
At the same time can be in more than 8 integral part of hollow drum (including outside circular small machine, turntable and positive and negative anodes conducting ring and upper and lower wheel shaft
Circle) hollow drum more than 8 overall (including circular small machine, turntable and positive and negative anodes conducting ring are shown on display fluorescent screen 15-4
And up and down wheel shaft outer ring) rotating speed n；
4th, circular small machine rotating speed n is set1(motor speed shows and read on fluorescent screen 15-5), then angular velocity omega1=2 π n1,
Upper wheel coiling center rotating inertia I1, circular small machine surrounds central axis inertia I2, hollow drum is used to around central axis
Measure I3, upper and lower wheel shaft outer rim surrounds central axis inertia I4, positive and negative conducting ring surrounds central axis inertia I5, then hollow turn
Cylinder above integral part (including circular small machine, turntable and positive and negative anodes conducting ring and upper and lower wheel shaft outer ring) surrounds central axis
Inertia is I=I1+I2+I3+I4+I5If photoelectric door measures more than 8 integral part of hollow drum (including circular small machine, turntable
With positive and negative anodes conducting ring and upper and lower wheel shaft outer ring) rotating speed (can show from electric cabinet and be read on fluorescent screen 15-4) for n, then angular speed
The π n of ω=2, calculate wheel disc angular momentum I respectively1ω1With more than 8 integral part of hollow drum (including circular small machine, turntable with just
Negative conductive ring and upper and lower wheel shaft outer ring) angular momentum I ω；
5th, since rotation system bonding force square is zero, according to result of calculation, if I1ω1≈ I ω, then be exactly to pass through the reality
Test instrument quantitative measurment, it was demonstrated that angular momentum conservation law is to set up.
Claims (2)
1. a kind of new angular momentum conservation demonstration and quantitative determination experiment instrument, it is characterised in that：Including leveling support leg (1), bottom
Seat (2), leveling spirit bubble (3), fixation hollow support column (4), lower wheel shaft (5), upper whorl axial (7), hollow center shaft (6), sky
Heart rotating cylinder (8), photoelectric door (9), positive conductive brush (10), negative conductive brush (11), circular small machine (12), turntable (13), electricity
Machine shaft (14), motor transfer bus (16), the first transmission line (17), the second transmission line (18) and electric cabinet (15)；
Three leveling support legs (1) are set under base (2), are provided with leveling spirit bubble (3) on base (2), base (2) center is set
Fixation hollow support column (4) is put, hollow center shaft (6) is set among fixation hollow support column (4), in hollow center shaft
(6) upper end is fixedly connected with hollow center rotating shaft support column (6-0), hollow center rotating shaft support column (6-0) phase successively from down to up
Between photoelectric door (9), positive conductive brush (10) and negative conductive brush (11) is fixedly mounted, positive conductive ring (10-0) is exhausted using two
Edge column (10-10) is corresponding with positive conductive brush (10) to be fixed on hollow drum (8), and negative conductive ring (11-0) is exhausted using two
Edge column (11-10) is corresponding with negative conductive brush (11) to be fixed on hollow drum (8), respectively from positive conductive ring (10-0) with bearing
Pole conducting ring (11-0) lower end welds two conducting wires and passes through hollow drum (8) eye position to hollow drum (8) appearance, is close to hollow turn
Cylinder (8) appearance is connected with the positive negative terminal of circular small machine (12)；
Circular small machine (12) is fixed on hollow drum (8) upper end, and turntable (13) is fixed with machine shaft (14)；Hollow turn
Cylinder (8) with hollow rotating shaft (6) is rotatablely connected using upper whorl axial (7) and lower wheel shaft (5), and the inner edge (7-2) of upper whorl axial (7) is with
Wheel shaft inner edge (5-2) is fixedly connected with hollow rotating shaft (6) outer surface respectively, the outer rim (7-3) of upper whorl axial (7) and lower wheel shaft (5)
Outer rim (5-3) be fixedly connected respectively with hollow drum (8) inner surface, at this time, the bar that is in the light (9-0) can pass freely through transmitting light
It is in the light between electric switch (9-2) and reception photoelectric door (9-3), contact brush (150) and the positive conductive ring of positive conductive brush (10)
(10-0), which coincide, to be contacted, and the contact brush (150) of negative conductive brush (11) coincide with negative conductive ring (11-0) to be contacted；
Electric cabinet (15) is slided by power transmission line by the contact brush (150) of positive conduction brush (10) on positive conducting ring (10-0)
Conduction, the contact brush (150) of negative conductive brush (11) sliding conduction on negative conductive ring (11-0), for circular small machine
(12) power, circular small machine (12) drives turntable (13) to rotate；
Hollow drum (8) is rotated together with the positive conductive ring (10-0) for being fixed therein side with negative conductive ring (11-0),
Positive conductive brush (10) and negative conductive brush (11) are slided with positive conductive ring (10-0) and negative conductive ring (11-0) respectively to be connect
Touch conduction.
2. new angular momentum conservation demonstration according to claim 1 and quantitative determination experiment instrument, it is characterised in that：The light
The transmitting photoelectric door transmission line (9-20) and reception photoelectric door transmission line (9-30) of electric switch (9) are through the second transmission line (18), first
Transmission line (17) imports motor transfer bus (16) and enters electric cabinet (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720652957.3U CN207268907U (en) | 2017-06-07 | 2017-06-07 | New angular momentum conservation demonstration and quantitative determination experiment instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720652957.3U CN207268907U (en) | 2017-06-07 | 2017-06-07 | New angular momentum conservation demonstration and quantitative determination experiment instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207268907U true CN207268907U (en) | 2018-04-24 |
Family
ID=61959652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720652957.3U Expired - Fee Related CN207268907U (en) | 2017-06-07 | 2017-06-07 | New angular momentum conservation demonstration and quantitative determination experiment instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207268907U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766135A (en) * | 2018-05-18 | 2018-11-06 | 浙江大学城市学院 | A kind of angular momentum conservation demonstration experiment instrument |
| CN112697329A (en) * | 2021-03-24 | 2021-04-23 | 山东科技职业学院 | Centrifugal force detection device for physical laboratory |
-
2017
- 2017-06-07 CN CN201720652957.3U patent/CN207268907U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766135A (en) * | 2018-05-18 | 2018-11-06 | 浙江大学城市学院 | A kind of angular momentum conservation demonstration experiment instrument |
| CN112697329A (en) * | 2021-03-24 | 2021-04-23 | 山东科技职业学院 | Centrifugal force detection device for physical laboratory |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180424 Termination date: 20190607 |