CN209657598U

CN209657598U - Law of conservation of mechanical energy experimental demonstration device

Info

Publication number: CN209657598U
Application number: CN201821589143.0U
Authority: CN
Inventors: 徐卿瀚
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2019-11-19
Anticipated expiration: 2028-09-28

Abstract

A kind of law of conservation of mechanical energy experimental demonstration device, it is related to teaching aid technical field, it includes device pedestal and dotted timer, support tube is vertically equipped on device pedestal, fixing sleeve is cased on support tube, fixing sleeve is connect by support frame with dotted timer, handwheel is equipped on the outside of support tube, handwheel is connect by transmission shaft with gear, tube inner chamber is supported to be equipped with rack, by sliding slot, inner wall is connect rack up and down with support tube, rack top passes through support tube and support rod one end is welded, support rod bottom end is equipped with fixed pulley, connecting rope is wound on fixed pulley, connecting rope both ends are connect with iron block one and iron block two respectively, one bottom end of iron block is connect by hook with paper slip；The outer surface of dotted timer is equipped with carbon paper, and the outer surface of carbon paper is movably installed with vibration needle, and paper slip is passed through between carbon paper and dotted timer.The reason of this law of conservation of mechanical energy experimental demonstration device realizes the demonstration work of the law of conservation of mechanical energy, intuitively expresses conservation of mechanical energy.

Description

Law of conservation of mechanical energy experimental demonstration device

Technical field

The utility model relates to teaching aid technical fields, and in particular to law of conservation of mechanical energy experimental demonstration device.

Background technique

In physics teaching, the experiment of the law of conservation of mechanical energy is not verified, is caused in junior middle school and teaching of senior high school, only from theory On be briefly described, in junior middle school, only briefly touch upon conversion and the conservation of mechanical energy, illustrate on textbook, roller-coaster is finally assorted It exhausts energy and has stopped getting off, because mechanical energy overcomes air drag to be converted to thermal energy, illustrate that mechanical energy can be converted into it The energy of its form, if mechanical energy keeps conservation in the conversion process without heat-energy losses；In senior middle school, after theoretical calculation It obtains, in the case of only gravity, elastic force acting, the kinetic energy and potential energy of object are mutually converted, but the total amount of mechanical energy It remains unchanged, this conclusion is the law of conservation of mechanical energy.And lacked a kind of experimental provision for being able to verify that the law of conservation of mechanical energy, Students can not be intuitively allowed to understand the meaning of law.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned the shortcomings of the prior art places, and provide a kind of mechanical energy Law of conservation experimental demonstration device, it realizes the demonstration work of the law of conservation of mechanical energy, intuitively expresses conservation of mechanical energy The reason of.

In order to solve the problems existing in background technology, the utility model is adopted the following technical scheme that including device bottom Seat and dotted timer are vertically equipped with support tube on device pedestal, are cased with fixing sleeve on support tube, fixing sleeve by support frame with Dotted timer connection, support tube outside are equipped with handwheel, and handwheel is connect by transmission shaft with gear, and gear is located in support tube, Tube inner chamber is supported to be equipped with rack, rack and gear tooth are intermeshed, and rack passes through sliding slot and support tube inner wall up and down Connection, rack upper and lower part are respectively mounted sliding block, and the inner cavity of sliding block activity installation pulley, rack top pass through support tube Welded with support rod one end, support rod bottom end is equipped with fixed pulley, be wound with connecting rope on fixed pulley, connecting rope both ends respectively with iron block One and iron block two connect, one bottom end of iron block by hook is connect with paper slip；The outer surface of the dotted timer is equipped with manifolding Paper, the outer surface of carbon paper are movably installed with vibration needle, and paper slip is passed through between carbon paper and dotted timer.

The quality of the iron block one is less than the quality of iron block two.

The dotted timer is equipped with and connects power port.

The utility model has the beneficial effects that it is safe and reliable, it is full-featured, by handwheel and rack, reach device liter The purpose of drop meets teaching height, so as to the presentation process of the clear viewing apparatus of students；Paper slip, benefit are pulled by iron block Timer is hit with getting ready, completes the demonstration work of the law of conservation of mechanical energy, so as to the more intuitive more thorough understanding machine of students The reason of tool energy conservation, and then improve efficiency of teaching and learning efficiency.

Detailed description of the invention:

Fig. 1 is the utility model structure diagram；

Fig. 2 is the utility model support tube internal structure chart.

Specific embodiment:

Referring to each figure, the utility model is specifically using being implemented as follows mode: including device pedestal 1 and dotted timer 12, It is vertically equipped with support tube 2 on device pedestal 1, fixing sleeve 3 is cased on support tube 2, fixing sleeve 3 passes through support frame and dotted timer 12 connect, and handwheel 5 is equipped on the outside of support tube 2, and handwheel 5 is connect by transmission shaft 4 with gear 17, and gear 17 is located in support tube 2, 2 inner cavity of support tube is equipped with rack 6, and rack 6 and 17 gear teeth of gear are intermeshed, and rack 6 passes through sliding slot 18 and support tube 2 Upper and lower inner wall connection, 6 upper and lower part of rack are respectively mounted sliding block 19, the inner cavity of sliding block 19 activity installation pulley 20, gear 6 top of bar passes through support tube 2 and 7 one end of support rod is welded, and 7 bottom end of support rod is equipped with fixed pulley 8, is wound with connection on fixed pulley 8 Rope 16,16 both ends of connecting rope are connect with iron block 1 and iron block 29 respectively, and one 10 bottom end of iron block is connected by hook and paper slip 11 It connects；The outer surface of the dotted timer 12 is equipped with carbon paper 13, and the outer surface of carbon paper 13 is movably installed with vibration needle 14, multiple It writes and passes through paper slip 11 between paper 13 and dotted timer 12.The quality of the iron block 1 is less than the quality of iron block 29.It is described Dotted timer 12 be equipped with connect power port 15.

When in use, device pedestal 1 is placed on ground or dais for this law of conservation of mechanical energy experimental demonstration device, The height of support rod 7 is adjusted, the student for meeting heel row in classroom also can be clearly seen that the presentation process of whole device, rotate Handwheel 5, handwheel 5 drive the gear 17 of its end to rotate by transmission shaft 4, due to the gear teeth of gear 17 and the gear teeth of rack 6 Intermeshing, so rack 6 by gear 17 rotate clockwise perhaps rotate counterclockwise reached rise or decline Purpose, and then achieved the purpose that support rod 7 rises or declines.For the smoothly rising or decline of mate gear bar 6, Sliding slot 18 is set in support tube 2, and is equipped with the sliding block 19 for helping sliding in 6 upper and lower part of rack, and set on sliding block 19 There is pulley 20,20 mate gear bar 6 of pulley moves up and down.

Since one end that 6 top of rack passes through 2 top of support tube and support rod 7 is welded, teacher can be according to oneself Height or the seat distances of students adjust the height of support rod 7, the student for reaching each position can be complete and clear The presentation process of the viewing apparatus of Chu.

The present apparatus is in demonstration, by connecing power port 15 for 12 external power supply of dotted timer, and passes through dotted timer 12 Switch open dotted timer 12 it allowed to be preheated, after a period of time, 12 the operation is stable of dotted timer allows iron block 29 It falls by static since eminence, during iron block 29 falls, since the quality of iron block 29 is greater than the matter of iron block 1 Amount, therefore iron block 29 pulls iron block 1 to rise by the effect of fixed pulley 8 and connecting rope 16, iron block 1 and iron block 29 are equal Uniformly accelrated rectilinear motion is done, and then iron block 1 pulls paper slip 11 to do uniformly accelrated rectilinear motion upwards, first by dotted timer 12 Power on, vibration needle 14 can by carbon paper 13 on paper slip 11 one initial point of label, as 0 point, and paper slip 11 rise During, the vibration needle 14 of dotted timer 12 regular can be struck back and forth in carbon paper 13, and carbon paper 13 has multiple Writing is used, therefore the point that needle 14 is beaten that shakes can be marked on paper slip 11 again by carbon paper 13, i.e. vibration needle 14 can pass through carbon paper 13 N point is marked on paper slip 11, measures the 0th point of distance (L) to nth point on paper slip 11, it is known that system gravitional force subtracts On a small quantity, the time interval (frequency that t=n/f, f are alternating current) for getting two o'clock, when getting nth point, iron block 1 and iron block 2 10 Instantaneous velocity can acquire, it is known that the increment of system kinetic energy, i.e., known to potential energy reduction amount it is identical as the incrementss of kinetic energy, when One section of uniform point is chosen in paper slip 11 to measure, and in conjunction with the rule of getting ready of dotted timer 12, can calculate iron block 1 The speed of the different periods to fall with iron block 2 10, in conjunction with the calculating of law of conservation of mechanical energy formula progress different periods, then into Row comparison, can verify in allowable error mechanical energy whether conservation.

In conclusion this law of conservation of mechanical energy experimental demonstration device is full-featured, securely and reliably, pass through handwheel 5 and tooth Bar 6 is taken turns, has achieved the purpose that device is gone up and down, meets teaching height, so as to the presentation process of the clear viewing apparatus of students；It is logical It crosses iron block and pulls paper slip 11, hit timer 12 using getting ready, the demonstration work of the law of conservation of mechanical energy is completed, so as to students The reason of more intuitive more thorough understanding conservation of mechanical energy, and then improve efficiency of teaching and learning efficiency.

Claims

1. a kind of law of conservation of mechanical energy experimental demonstration device, including device pedestal (1) and dotted timer (12), device pedestal (1) support tube (2) vertically are equipped on, are cased with fixing sleeve (3) on support tube (2), fixing sleeve (3) is by support frame and gets timing ready Device (12) connection, it is characterised in that: be equipped with handwheel (5) on the outside of support tube (2), handwheel (5) passes through transmission shaft (4) and gear (17) Connection, gear (17) are located in support tube (2), and support tube (2) inner cavity is equipped with rack (6), and rack (6) and gear (17) are taken turns Tooth intermeshing, by sliding slot (18), inner wall is connect rack (6) up and down with support tube (2), and rack (6) upper and lower part is equal It installs sliding block (19), activity installation pulley (20) of the inner cavity of sliding block (19), rack (6) top passes through support tube (2) and branch The welding of strut (7) one end, support rod (7) bottom end are equipped with fixed pulley (8), are wound with connecting rope (16), connecting rope on fixed pulley (8) (16) both ends are connect with iron block one (10) and iron block two (9) respectively, and iron block one (10) bottom end is connect by hook with paper slip (11), The quality of the iron block one (10) is less than the quality of iron block two (9)；The outer surface of the dotted timer (12) is equipped with multiple It writes paper (13), the outer surface of carbon paper (13) is movably installed with vibration needle (14), between carbon paper (13) and dotted timer (12) Across paper slip (11).

2. law of conservation of mechanical energy experimental demonstration device according to claim 1, it is characterised in that: described gets timing ready Device (12) is equipped with and connects power port (15).