CN110164262A - A kind of physics teaching spring force demonstration equipment - Google Patents
A kind of physics teaching spring force demonstration equipment Download PDFInfo
- Publication number
- CN110164262A CN110164262A CN201910481986.1A CN201910481986A CN110164262A CN 110164262 A CN110164262 A CN 110164262A CN 201910481986 A CN201910481986 A CN 201910481986A CN 110164262 A CN110164262 A CN 110164262A
- Authority
- CN
- China
- Prior art keywords
- spring force
- pedestal
- groove
- rectangular opening
- physics teaching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
Abstract
The present invention relates to technical field of experiment equipment, in particular a kind of physics teaching spring force demonstration equipment, including pedestal, it is opened up on pedestal fluted, the sliding slot of positional symmetry is offered on the two sides cell wall of groove, dynamometer is equipped in groove, and it is closely bonded between the bottom end of dynamometer and the bottom end cell wall of groove, sliding block is equipped in groove, one end of pedestal offers the first rectangular opening, ruler is bonded on the upper surface of pedestal, one end of pedestal is equipped with transmission mechanism, and limit assembly is installed on transmission mechanism, the present invention passes through the transmission mechanism installed on the device, facilitate the effect for pulling dynamometer to realize, and the limit assembly by installing on the device, it is fixed so as to carry out easily limit to sliding block, realize the effect to the convenient reading of registration on dynamometer and ruler, in addition also by setting at this The sliding block of standby upper installation knows the effect that stretching distance is shown while elastic force to realize in demonstration.
Description
Technical field
The present invention relates to technical field of experiment equipment, specially a kind of physics teaching spring force demonstration equipment.
Background technique
In physics, many physical equations are dry as dust, and are not easy to remember, and student gets up not feeling emerging even more in study
Interest.Teaching aid can be very good the interest for having transferred student's learning physics knowledge as a kind of model, a kind of tool.It is taught in physics
In, when encountering progress spring force experiment, need to describe the relationship of spring force Yu its deformation, thus spring is used in teaching
Elastic force demonstration equipment comes into being.
Existing spring force demonstration equipment is simpler and cruder, therefore often directly demonstrates bullet with weight beam in teaching process
Spring force can not intuitively obtain spring elongation or compression distance in demonstration;Existing spring force demonstration equipment is vulnerable to artificial
Interference, such as: when stretching or compressed spring, needing to keep state at that time and read, operation is inconvenient, in consideration of it, it is proposed that
A kind of physics teaching spring force demonstration equipment.
Summary of the invention
The purpose of the present invention is to provide a kind of buoyancy effect Factor Experiment equipment, to solve to propose in above-mentioned background technique
The problem of.
To achieve the above object, the invention provides the following technical scheme:
A kind of physics teaching spring force demonstration equipment, including pedestal open up fluted, the groove on the pedestal
Two sides cell wall on offer the sliding slot of positional symmetry, be equipped with dynamometer in the groove, and the bottom end of the dynamometer with
It being closely bonded between the bottom end cell wall of groove, sliding block is equipped in the groove, one end of the pedestal offers the first rectangular opening,
Ruler is bonded on the upper surface of the pedestal, one end of the pedestal is equipped with transmission mechanism, and installs on the transmission mechanism
There is limit assembly.
Preferably, the transmission mechanism includes gear box, closely bonded between the gear box and pedestal, the transmission
The second rectangular opening is offered on the side wall of box, size is identical between second rectangular opening and the first rectangular opening and position is corresponding,
Through-hole is offered on the side wall of the gear box, arc groove is offered in the gear box, between the through-hole and arc groove mutually
It is connected, jack is offered on the side cell wall of the arc groove, the through-hole is corresponding with jack position, sets in the arc groove
There is gear cylinder, shaft is installed on the gear cylinder, the shaft runs through gear cylinder, and between one end and jack of the shaft
Mating, the other end of the shaft passes through outside through-hole to gear box and is closely welded with rocking bar in shaft.
Preferably, the limit assembly includes round bar, closely welded between one end of the round bar and the side wall of gear box
It connects, the round bar and the second rectangular opening are in the same plane, and restraining position ring block, the round bar are closely welded in one end of the round bar
It is equipped with lantern ring, is closely welded with snap-gauge on the lantern ring.
Preferably, interconnect between second rectangular opening and arc groove, and the bottom end of the gear cylinder is in the
In two rectangular openings.
Preferably, being bonded triangle on the side wall of the sliding block refers to that block, the triangle refer to that block is located above groove, and described
Triangle refers to the graduation mark on the tip face ruler of block.
Preferably, the two sidewalls of the sliding block are equipped with protrusion close to bottom position, and each protrusion is embedded
In in sliding slot.
Preferably, being bonded with engagement plate close to bottom position on the left side wall of the sliding block, and glued on the engagement plate
It is connected to the Saw blade of several linear isometry arrangements.
Preferably, one end of the engagement plate is through the first rectangular opening and extends in the second rectangular opening, and the rank
It intermeshes between the gear teeth on Saw blade and gear cylinder on fishplate bar.
Preferably, being engaged by clamping between the snap-gauge and every two Saw blade
Preferably, the outer annular diameter of the stop collar is greater than the annular diameters of lantern ring.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention passes through the transmission mechanism installed on the device, so that the effect for facilitating and pulling dynamometer is realized,
Eliminate interference of the human factor in demonstration;
2, the present invention is fixed by the limit assembly installed on the device so as to carry out easily limit to sliding block,
The effect to the convenient reading of registration on dynamometer and ruler is realized, dynamometer need to artificially be controlled by, which avoiding, stretches or compress survey
The case where power meter, occurs;
3, the present invention knows to show drawing while elastic force to realize by the sliding block installed on the device in demonstration
The effect of distance is stretched, better help teacher explains and the understanding of student.
Detailed description of the invention
Fig. 1 is overall structure figure of the invention;
Fig. 2 is the structure chart of pedestal in the present invention;
Fig. 3 is the explosive view of transmission mechanism in the present invention;
Fig. 4 is the cross-sectional view of gear box in the present invention;
Fig. 5 is the explosive view of limit assembly in the present invention;
Fig. 6 is the structure chart of sliding block in the present invention.
In figure: pedestal 1, groove 11, sliding slot 12, the first rectangular opening 13, dynamometer 2, sliding block 3, triangle refer to block 31, protrusion
32, engagement plate 33, Saw blade 34, ruler 4, transmission mechanism 5, gear box 51, through-hole 511, the second rectangular opening 512, arc groove
513, jack 514, rocking bar 52, gear cylinder 53, shaft 531, limit assembly 6, round bar 61, stop collar 611, lantern ring 62, snap-gauge 63.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
Fig. 1-6 is please referred to, the present invention provides a kind of technical solution:
A kind of physics teaching spring force demonstration equipment offers on pedestal 1 as depicted in figs. 1 and 2, including pedestal 1
Groove 11 offers the sliding slot 12 of positional symmetry on the two sides cell wall of groove 11, and dynamometer 2, and dynamometry are equipped in groove 11
It is closely bonded between the bottom end of meter 2 and the bottom end cell wall of groove 11, is equipped with sliding block 3 in groove 11, one end of pedestal 1 offers the
One rectangular opening 13 is bonded with ruler 4 on the upper surface of pedestal 1, and one end of pedestal 1 is equipped with transmission mechanism 5, and on transmission mechanism 5
Limit assembly 6 is installed.
In specific implementation, 2 upper hook position of face dynamometer is bonded with cord on sliding block 3, and the cord on sliding block 3 ties up to
On the hook of dynamometer 2, to realize connection effect between sliding block 3 and dynamometer 2, and guarantee that the cord on sliding block 3 is in water
Level state, the situation that avoid causes experimental result inaccurate due to there is component when cord pulls sliding block 3 occur.
As shown in Figure 3 and Figure 4, transmission mechanism 5 includes gear box 51, is closely bonded between gear box 51 and pedestal 1, is driven
The second rectangular opening 512 is offered on the side wall of box 51, size is identical between the second rectangular opening 512 and the first rectangular opening 13 and position
It is corresponding, through-hole 511 is offered on the side wall of gear box 51, arc groove 513, through-hole 511 and arc groove are offered in gear box 51
It being interconnected between 513, jack 514 is offered on the side cell wall of arc groove 513, through-hole 511 is corresponding with 514 position of jack,
It is equipped with gear cylinder 53 in arc groove 513, shaft 531 is installed on gear cylinder 53, shaft 531 runs through gear cylinder 53, and shaft 531
One end and jack 514 between it is mating, the other end of shaft 531 passes through that through-hole 511 is outer to gear box 51 and shaft 531
On be closely welded with rocking bar 52.
In the present embodiment, interconnected between the second rectangular opening 512 and arc groove 513, and the bottom end of gear cylinder 53 is in
In second rectangular opening 512, to realize the effect that gear cylinder 53 moves up and down inside gear box 51.
As shown in figure 5, limit assembly 6 includes round bar 61, closely welded between one end of round bar 61 and the side wall of gear box 51
It connects, round bar 61 and the second rectangular opening 512 are in the same plane, and restraining position ring block 611, round bar 61 are closely welded in one end of round bar 61
It is equipped with lantern ring 62, is closely welded with snap-gauge 63 on lantern ring 62.
In the present embodiment, round bar 61 runs through lantern ring 62, and is fixedly connected between snap-gauge 63 and lantern ring 62, so that card can be realized
The effect that plate 63 is freely rotated on round bar 61.
It in the present embodiment, is engaged by clamping between snap-gauge 63 and every two Saw blade 34, stirs snap-gauge 63 and be clamped into Saw blade
, it can be achieved that limit effect to engagement plate 33 when between 34.
In the present embodiment, the outer annular diameter of stop collar 611 is greater than the annular diameters of lantern ring 62, so that it is de- to can avoid lantern ring 62
Occur from the case where round bar 61.
As shown in fig. 6, being bonded triangle on the side wall of sliding block 3 refers to that block 31, triangle refer to that block 31 is located at 11 top of groove, and triangle
Refer to the graduation mark on the tip face ruler 4 of block 31, the two sidewalls of sliding block 3 are equipped with protrusion 32 close to bottom position, and each
Protrusion 32 is embedded in sliding slot 12, is bonded with engagement plate 33 close to bottom position on the left side wall of sliding block 3, and on engagement plate 33
It is bonded with the Saw blade 34 of several linear isometry arrangements.
In the present embodiment, one end of engagement plate 33 through the first rectangular opening 13 and is extended in the second rectangular opening 512, and holds in the mouth
It intermeshes between the gear teeth on Saw blade 34 on fishplate bar 33 and gear cylinder 53, thus while realizing the rotation of gear cylinder 53
The effect for driving engagement plate 33 to move horizontally.
Further, since each raised 32 are embedded in sliding slot 12, thus can realize the limit effect to sliding block 3,
Avoid the problem of sliding block 3 deflects during sliding appearance.
The physics teaching of the present embodiment is in use with spring force demonstration equipment, first ties up to the cord on sliding block 3
On the hook of dynamometer 2, subsequent hand-held rotating rocker 52, due to closely welding and shaft 531 is passed through between rocking bar 52 and shaft 531
Gear cylinder 53 and be bonded with its is worn, so that gear cylinder 53 also rotates synchronously therewith with the rotation of rocking bar 52, according to gear cylinder 53
It intermeshes between the Saw blade 34 on engagement plate 33, final engagement plate 33 is sliding in groove 11 with the rotation of rocking bar 52
It is dynamic, and be fixedly connected between engagement plate 33 and sliding block 3, therefore sliding block 3 moves in groove 11, this process realizes convenient pulling and surveys
The effect of power meter 2, and avoid the interference of human factor;
During rotating rocker 52 causes sliding block 3 to slide, since triangle refers to that block 31 also moves, it is directed toward on ruler 4
Different graduation marks stir snap-gauge 63 when sliding block 3 is moved to required position and be clamped into two neighboring Saw blade 34, due to
Stop collar 611 can carry out position-limiting action to lantern ring 62, the limit fixed effect to sliding block 3 be realized, to realize fixed drawing
The effect of 2 length of dynamometer, the registration on convenient reading dynamometer 2 and ruler 4 are stretched or compress, to preferably demonstrate spring bullet
Power process and inner principle facilitate the understanding of teacher's explanation and student.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited to the above embodiments, described in the above embodiment and specification is only the present invention
Preference, be not intended to limit the invention, without departing from the spirit and scope of the present invention, the present invention also has various
Changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by institute
Attached claims and its equivalent thereof.
Claims (10)
1. a kind of physics teaching spring force demonstration equipment, including pedestal (1), it is characterised in that: opened up on the pedestal (1)
Fluted (11), offer the sliding slot (12) of positional symmetry on the two sides cell wall of the groove (11), in the groove (11)
It is closely bonded equipped with dynamometer (2), and between the bottom end of the dynamometer (2) and the bottom end cell wall of groove (11), the groove
(11) sliding block (3) are equipped in, one end of the pedestal (1) offers the first rectangular opening (13), on the upper surface of the pedestal (1)
It is bonded with ruler (4), one end of the pedestal (1) is equipped with transmission mechanism (5), and is equipped with limit on the transmission mechanism (5)
Component (6).
2. physics teaching according to claim 1 spring force demonstration equipment, it is characterised in that: the transmission mechanism
(5) include gear box (51), closely bonded between the gear box (51) and pedestal (1), on the side wall of the gear box (51)
It offers the second rectangular opening (512), size is identical between second rectangular opening (512) and the first rectangular opening (13) and position pair
It answers, is offered through-hole (511) on the side wall of the gear box (51), offer arc groove (513), institute in the gear box (51)
It states and is interconnected between through-hole (511) and arc groove (513), offer jack on the side cell wall of the arc groove (513)
(514), the through-hole (511) is corresponding with jack (514) position, is equipped with gear cylinder (53) in the arc groove (513), the tooth
Wheel cylinder (53) on be equipped with shaft (531), the shaft (531) run through gear cylinder (53), and one end of the shaft (531) with
Mating between jack (514), the other end of the shaft (531) outside and turns across through-hole (511) to gear box (51)
Rocking bar (52) are closely welded on axis (531).
3. physics teaching according to claim 2 spring force demonstration equipment, it is characterised in that: the limit assembly
(6) include round bar (61), closely welded between one end of the round bar (61) and the side wall of gear box (51), the round bar (61)
In the same plane with the second rectangular opening (512), one end of the round bar (61) is closely welded restraining position ring block (611), described
Round bar (61) is equipped with lantern ring (62), is closely welded with snap-gauge (63) on the lantern ring (62).
4. physics teaching according to claim 3 spring force demonstration equipment, it is characterised in that: second rectangular opening
(512) it is interconnected between arc groove (513), and the bottom end of the gear cylinder (53) is in the second rectangular opening (512).
5. physics teaching according to claim 4 spring force demonstration equipment, it is characterised in that: the sliding block (3)
It is bonded triangle on side wall to refer to block (31), the triangle refers to that block (31) is located above groove (11), and the triangle refers to block (31)
Graduation mark on tip face ruler (4).
6. physics teaching according to claim 5 spring force demonstration equipment, it is characterised in that: the sliding block (3)
Two sidewalls are equipped with raised (32) close to bottom position, and each raised (32) are embedded in sliding slot (12).
7. physics teaching according to claim 6 spring force demonstration equipment, it is characterised in that: the sliding block (3)
It is bonded with engagement plate (33) on left side wall close to bottom position, and is bonded with several linear isometry arrangements on the engagement plate (33)
Saw blade (34).
8. physics teaching according to claim 7 spring force demonstration equipment, it is characterised in that: the engagement plate (33)
One end through the first rectangular opening (13) and extend in the second rectangular opening (512), and the Saw blade on the engagement plate (33)
(34) it intermeshes between the gear teeth on gear cylinder (53).
9. physics teaching according to claim 8 spring force demonstration equipment, it is characterised in that: the snap-gauge (63) with
Every two Saw blade is engaged by clamping between (34).
10. physics teaching according to claim 9 spring force demonstration equipment, it is characterised in that: the stop collar
(611) outer annular diameter is greater than the annular diameters of lantern ring (62).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201910481986.1A CN110164262A (en) | 2019-06-04 | 2019-06-04 | A kind of physics teaching spring force demonstration equipment |
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CN201910481986.1A CN110164262A (en) | 2019-06-04 | 2019-06-04 | A kind of physics teaching spring force demonstration equipment |
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CN110164262A true CN110164262A (en) | 2019-08-23 |
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ID=67627507
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CN201910481986.1A Pending CN110164262A (en) | 2019-06-04 | 2019-06-04 | A kind of physics teaching spring force demonstration equipment |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115100926A (en) * | 2022-07-07 | 2022-09-23 | 淮阴工学院 | Teaching elasticity presentation device based on physical experiment |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN204576908U (en) * | 2015-04-27 | 2015-08-19 | 马旭平 | Adjustable pulling force theorem device |
CN206002228U (en) * | 2016-09-19 | 2017-03-08 | 刘洋 | A kind of device for measuring force |
CN206331692U (en) * | 2016-12-22 | 2017-07-14 | 颜玮千 | A kind of Physical Experiment intellectuality resilience demonstration instrument |
CN107170336A (en) * | 2017-05-25 | 2017-09-15 | 张誉泷 | Elastic force and spring elongation Linear Experiment analogue means |
CN206864042U (en) * | 2017-05-11 | 2018-01-09 | 乐山师范学院 | A kind of physics teaching spring force demonstration device |
CN107560763A (en) * | 2017-08-22 | 2018-01-09 | 泰州市江南教学仪器设备有限公司 | A kind of experimental teaching flat board dynamometer |
CN208027619U (en) * | 2018-04-24 | 2018-10-30 | 冯好 | A kind of novel physical teaching spring force apparatus for demonstrating |
CN208060063U (en) * | 2018-05-04 | 2018-11-06 | 华纬科技股份有限公司 | A kind of high-precision spring force measuring device |
-
2019
- 2019-06-04 CN CN201910481986.1A patent/CN110164262A/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN204576908U (en) * | 2015-04-27 | 2015-08-19 | 马旭平 | Adjustable pulling force theorem device |
CN206002228U (en) * | 2016-09-19 | 2017-03-08 | 刘洋 | A kind of device for measuring force |
CN206331692U (en) * | 2016-12-22 | 2017-07-14 | 颜玮千 | A kind of Physical Experiment intellectuality resilience demonstration instrument |
CN206864042U (en) * | 2017-05-11 | 2018-01-09 | 乐山师范学院 | A kind of physics teaching spring force demonstration device |
CN107170336A (en) * | 2017-05-25 | 2017-09-15 | 张誉泷 | Elastic force and spring elongation Linear Experiment analogue means |
CN107560763A (en) * | 2017-08-22 | 2018-01-09 | 泰州市江南教学仪器设备有限公司 | A kind of experimental teaching flat board dynamometer |
CN208027619U (en) * | 2018-04-24 | 2018-10-30 | 冯好 | A kind of novel physical teaching spring force apparatus for demonstrating |
CN208060063U (en) * | 2018-05-04 | 2018-11-06 | 华纬科技股份有限公司 | A kind of high-precision spring force measuring device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115100926A (en) * | 2022-07-07 | 2022-09-23 | 淮阴工学院 | Teaching elasticity presentation device based on physical experiment |
CN115100926B (en) * | 2022-07-07 | 2023-12-01 | 淮阴工学院 | Teaching elasticity presentation device based on physical experiment |
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