CN205318714U - Assembly pulley mechanical efficiency measuring device - Google Patents
Assembly pulley mechanical efficiency measuring device Download PDFInfo
- Publication number
- CN205318714U CN205318714U CN201521011611.2U CN201521011611U CN205318714U CN 205318714 U CN205318714 U CN 205318714U CN 201521011611 U CN201521011611 U CN 201521011611U CN 205318714 U CN205318714 U CN 205318714U
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- CN
- China
- Prior art keywords
- rope
- assembly pulley
- spring
- tackleblock
- motor
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Abstract
The utility model provides an assembly pulley mechanical efficiency measuring device, includes the support, hang assembly pulley on the support, around the rope on the assembly pulley, hang the heavy object in the assembly pulley below, the end -to -end connection of rope has the spring scale of measuring the pulling force size, its characterized in that: the support comprises base and riser, the digitated scale that shows the length value of mark on the riser, the upper end and the lower extreme of riser are provided with top sheave and lower sheave respectively, the outer end of spring scale is connected with the index rope, the index rope is walked around link to each other with the motor behind top sheave or the lower sheave. The beneficial effects are that: rising through motor pulling heavy object, not only having ensured reliability at the uniform velocity, especially need not hand the spring scale and stimulate the rope, the concentration that can make the people improves the measuring accuracy to the reading of spring scale, in the experimentation, can also halt the teacher's explanation of being convenient for at any time. Have simple structure, convenient operation, outstanding advantage that the accuracy is high, it is wide to promote application prospect.
Description
Technical field
The utility model relates to a kind of physics teaching instrument, particularly tackleblock mechanical efficiency measuring apparatus.
Background technology
The experiment of existing measurement tackleblock mechanical efficiency, comprise support, the tackleblock being suspended on support, around the rope on tackleblock, it is suspended on the weight below tackleblock, the end of described rope is connected with the spring measuring pulling force size and claims, measure the gravity of weight in advance, then claim at the uniform velocity to pull in the process of weight at hand-held spring, measure 5 amounts: the first position with, longer graduated scale being measured weight, with the last position of weight, the first position of cord free ends (spring claims position) measured by this graduated scale mobile, with position, end, spring claims the pulling force to rope. draw, from the difference of the first position of weight and position, end, the height that weight rises, draw, from the difference of the first position of cord free ends and position, end, the distance pulling rope to move, thus go out the size of mechanical efficiency according to formulae discovery. this experiment bothers and the experiment of difficulty very much during junior physics is tested, and reason is:
1, in experiment, hand-held spring to claim to pull rope, make weight at the uniform velocity rise or decline, the reading that spring claims also is observed on one side, usually can attend to one thing and lose sight of another, and causes accurately reading the registration that spring claims.
2, teacher is when demonstrating, and owing to spring claims with portable, often does a step when being commented on, whole device have to be put down, then does next step and again assemble again, wastes a large amount of instructional blocks of times.
Practical novel content
For above-mentioned the deficiencies in the prior art, the utility model provides a kind of tackleblock mechanical efficiency measuring apparatus, the hand-held of experimenter is replaced to pull spring to claim evenly with motor, thus make the experimenter can wholwe-hearted reading, improve the accuracy of reading, also requirement can suspend at any time, is convenient to teacher's explanation.
The technical solution adopted in the utility model is: a kind of tackleblock mechanical efficiency measuring apparatus, the tackleblock that comprise support, is suspended on support, around the rope on tackleblock, it is suspended on the weight below tackleblock, the end of described rope is connected with the spring measuring pulling force size and claims, it is characterized in that: described support is made up of base and vertical plate, the scale being marked with instruction length value on described vertical plate, upper end and the lower end of described vertical plate are respectively arranged with top sheave and lower sheave;The outer end that described spring claims is connected with index rope, and described index rope is connected with motor after walking around described top sheave or lower sheave, thus pulls weight to rise evenly by motor, and described motor is powered by low-voltage power supply.
The beneficial effects of the utility model are: pull weight to rise by motor, not only ensure reliability at the uniform velocity, particularly do not need hand-held spring to claim to pull rope, on the attention of people can be made to focus on reading that spring claims, it is to increase the accuracy of measurement; In experimentation, it is also possible to suspend at any time, it is convenient to teacher's explanation. Vertical plate upper and lower ends is respectively equipped with pulley, can measure spring and claim to pull-up and the mechanical efficiency under pulling down two kinds of situations. Having the outstanding advantage that structure is simple, easy to operate, accuracy is high, popularizing application prospect is wide.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model (spring claims to pull-up);
Fig. 2 is structural representation of the present utility model (spring claims to pull down);
In figure: 1 base, 2 lower sheaves, 3 vertical plates, 4 weights, 5 travelling block, 6 fixed pulleys, 7 cross bars, 8 top sheaves, 9 springs claim, 10 index ropes, 11 volume poplar wheels, 12 motors, 13 low-voltage power supplies, 14 ropes.
Embodiment
As shown in Figure 1 and Figure 2, base 1 being fixed with vertical plate 2, vertical plate is marked with the scale of instruction length value, upper end and the lower end of vertical plate 3 are respectively arranged with top sheave 8 and lower sheave 2. The cross bar 7 that vertical plate 2 end crosses out is hung with the tackleblock being made up of fixed pulley 6 and travelling block 5, the lower section of travelling block 5 is mounted with weight 4, tackleblock is wound with rope 14, the end of rope 14 is connected with the spring measuring pulling force size and claims 9, spring claims the outer end of 9 to be connected with index rope 10, the other end of index rope 10 is connected with motor 12, and motor 12 is powered by low-voltage power supply 13.
As shown in Figure 1, when being odd number around the rope number of share of stock on the travelling block of tackleblock, should upwards pulling spring to claim 9, the index rope 10 that spring claims 9 outer ends to connect is connected with the volume poplar wheel 11 of motor 12 after walking around top sheave 8.
As shown in Figure 2, when being even numbers around the rope number of share of stock on the travelling block of tackleblock, should pulling down spring of moving and claim 9, the index rope 10 that spring claims 9 outer ends to connect is connected with the volume poplar wheel 11 of motor 12 after walking around lower sheave 2.
Before experiment, measure the gravity of weight, the first position that record weight and spring claim; Start motor, pull weight at the uniform velocity to rise, at uphill process, read the registration that spring claims; Close down motor, the last position that record weight and spring claim, so that it may calculate the mechanical efficiency of tackleblock.
Claims (1)
1. a tackleblock mechanical efficiency measuring apparatus, the tackleblock that comprise support, is suspended on support, around the rope on tackleblock, it is suspended on the weight below tackleblock, the end of described rope is connected with the spring measuring pulling force size and claims, it is characterized in that: described support is made up of base and vertical plate, the scale being marked with instruction length value on described vertical plate, upper end and the lower end of described vertical plate are respectively arranged with top sheave and lower sheave; The outer end that described spring claims is connected with index rope, and described index rope is connected with motor after walking around described top sheave or lower sheave, thus pulls weight to rise evenly by motor, and described motor is powered by low-voltage power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521011611.2U CN205318714U (en) | 2015-12-08 | 2015-12-08 | Assembly pulley mechanical efficiency measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521011611.2U CN205318714U (en) | 2015-12-08 | 2015-12-08 | Assembly pulley mechanical efficiency measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205318714U true CN205318714U (en) | 2016-06-15 |
Family
ID=56315083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521011611.2U Expired - Fee Related CN205318714U (en) | 2015-12-08 | 2015-12-08 | Assembly pulley mechanical efficiency measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205318714U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766137A (en) * | 2018-05-31 | 2018-11-06 | 潍坊科技学院 | Skidding group device in a kind of physics teaching |
-
2015
- 2015-12-08 CN CN201521011611.2U patent/CN205318714U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766137A (en) * | 2018-05-31 | 2018-11-06 | 潍坊科技学院 | Skidding group device in a kind of physics teaching |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160615 Termination date: 20171208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |