CN214377222U

CN214377222U - Pulley research demonstration instrument

Info

Publication number: CN214377222U
Application number: CN202120601997.1U
Authority: CN
Inventors: 鲍晔挺; 王文荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-10-08
Anticipated expiration: 2031-03-24

Abstract

The utility model discloses a pulley research demonstration instrument, which comprises a demonstration board, a pulley body, a traction rope, a spring dynamometer and a heavy object; the display board comprises a front wall, a rear wall, a left wall, a right wall, an upper wall and a lower wall, and further comprises a supporting mechanism which enables the display board to stand when the left wall and the lower wall of the display board are positioned below the display board, the front wall of the display board is provided with a plurality of transverse and longitudinal grid lines, and the grid lines form a plurality of square grids; scales which are sequentially increased from 0 are sequentially marked at the positions corresponding to all longitudinal grid lines on the upper side of all the grid areas from left to right, and scales which are sequentially increased from 0 are sequentially marked at the positions corresponding to all transverse grid lines on the right side of all the grid areas from bottom to top; the upper right portion of the grid area is fixed with a screw on the display board, the middle of the pulley body is provided with a trepanning which can be sleeved on the screw, and the outer side wall of the pulley body is provided with a ring groove for winding a traction rope. The principle and the deep layer principle of the fixed pulley and the movable pulley can be respectively researched, so that students can conveniently learn and master the principle and the corresponding knowledge of the pulleys.

Description

Pulley research demonstration instrument

Technical Field

The utility model belongs to experiment teaching field, concretely relates to pulley research demonstration appearance.

Background

The pulley body is divided into a fixed pulley body and a movable pulley body, and is widely applied to life and production of people. Students just begin to learn the principle and relevant application of the pulley body in the beginning, but the explanation in books is not deep enough, so that the students are not easy to understand and master.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: the pulley research demonstration instrument can enable students to research the principle and the use characteristics of the fixed pulley body and the movable pulley body at the same time, and therefore understanding and learning application are deepened.

In order to realize the purpose of the utility model, the following technical scheme is adopted to realize: the pulley research demonstration instrument comprises a demonstration plate, a pulley body, a traction rope, a spring dynamometer and a heavy object; the display board comprises a front wall, a rear wall, a left wall, a right wall, an upper wall and a lower wall, and further comprises a supporting mechanism which enables the display board to stand when the left wall and the lower wall of the display board are positioned below the display board, the front wall of the display board is provided with a plurality of transverse and longitudinal grid lines, and the grid lines form a plurality of square grids; scales which are sequentially increased from 0 are sequentially marked at the positions corresponding to all longitudinal grid lines on the upper side of all the grid areas from left to right, and scales which are sequentially increased from 0 are sequentially marked at the positions corresponding to all transverse grid lines on the right side of all the grid areas from bottom to top; the upper right portion of the grid area is fixed with a screw on the display board, the middle of the pulley body is provided with a trepanning which can be sleeved on the screw, and the outer side wall of the pulley body is provided with a ring groove for winding a traction rope.

As a preferable scheme: the supporting mechanism comprises a first supporting plate and a second supporting plate, wherein the first supporting plate is connected with the left wall of the display board through a hinge, the second supporting plate is connected with the lower wall of the display board through a hinge, the first supporting plate is in contact with the left wall and the lower wall of the display board on one side, the second supporting plate is in contact with the left wall and the lower wall of the display board on the other side, and the first supporting plate and the second supporting plate are detachably connected.

As a preferable scheme: the first side is adhered with a permanent magnet sheet a, and the second side is adhered with a permanent magnet sheet b mutually attracted with the permanent magnet sheet a.

As a preferable scheme: two red rubber rings are sleeved on the traction rope.

As a preferable scheme: the pulley body comprises two menisci and a strip-shaped lever, one of the two menisci is detachably connected with the upper end of the strip-shaped lever, and the other is detachably connected with the lower end of the strip-shaped lever; the meniscus comprises an arc-shaped wall and a flat wall opposite to the arc-shaped wall, a side groove a is formed in the arc-shaped wall of the meniscus, a side groove b is formed in the left end of the strip-shaped lever, a side groove c is formed in the right end of the strip-shaped lever, and the side grooves a, b and c form a complete ring groove; the trepanning is formed in the middle of the strip-shaped lever.

As a preferable scheme: the middle parts of the upper end and the lower end of the strip-shaped lever are respectively provided with an inserting groove, and the flat wall of each meniscus is fixedly connected with an inserting plate inserted with the adjacent inserting groove.

As a preferable scheme: the bar-shaped lever comprises a first rod and a second rod hinged with the first rod, and the adjacent ends of the first rod and the second rod are meniscus walls respectively; one end of the first rod, which is far away from the second rod, is provided with an edge groove b, and the end of the second rod, which is far away from the first rod, is provided with an edge groove c; the middle part of the end of the first rod close to the second rod is connected with a connecting rod, and the middle part of the end of the second rod close to the first rod is provided with a connecting groove for accommodating the connecting rod; the connecting rod is connected with the second rod through a pin shaft.

As a preferable scheme: and a bar magnet is bonded at one end of the inserting plate, which is far away from the meniscus, and an iron sheet attracted by the magnet is bonded in the inserting groove.

Compared with the prior art, the utility model discloses a main beneficial effect is: the supporting mechanism is connected with the display board through the hinge, so that the occupied space is reduced when the supporting plate and the display board are combined and are not used; the pulley body can be split, so can study the principle and the deep principle of fixed pulley body and movable pulley body respectively, be convenient for the student study and master the principle and the corresponding knowledge of pulley body.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic structural view of the display board and the supporting mechanism of the present invention;

fig. 3 is a schematic view of a rubber ring on the traction rope sleeve of the utility model;

fig. 4 is a schematic structural view of the pulley body of the present invention;

FIG. 5 is a schematic view of a meniscus configuration of the present invention;

fig. 6 is a schematic structural diagram of the strip lever of the present invention;

FIG. 7 is a schematic view of a first rod of the present invention;

FIG. 8 is a schematic view of a second rod according to the present invention;

FIG. 9 is a schematic view of the fixed pulley body of the present invention removing a meniscus;

fig. 10 is a schematic view of the fixed pulley body of the present invention relative to an equiarm lever;

fig. 11 is a schematic view of the present invention for studying the force direction of the fixed pulley body;

fig. 12 is a schematic view of the movable pulley body according to the present invention;

FIG. 13 is a schematic view of the present invention, showing a meniscus removed by a movable pulley body wheel;

fig. 14 is a schematic view of the power saving lever of the invention, wherein the movable pulley body is 1: 2.

Reference numerals: 1. a display board; 11. grid lines; 12. calibration; 13. a screw; 2. a first support plate; 21. a first side; 3. a second support plate; 31. a second edge; 4. a pulley body; 41. a meniscus; 411. inserting plates; 412. a side groove a; 42. a bar-shaped lever; 421. a first lever; 4211. a first groove; 4212. a side groove b; 4213. a connecting rod; 422. a second lever; 4221. a second groove; 4222. a side groove c; 4223. connecting grooves; 43. a pin shaft; 5. a hauling rope; 51. a rubber ring; 6. a weight; 7. a spring load cell.

Detailed Description

A detailed description of the present invention will be given below with reference to fig. 1 to 14.

The present embodiment is a pulley research demonstration instrument, as shown in fig. 1, comprising a demonstration board 1, a pulley body 4, a traction rope 5, a spring dynamometer 7 and a weight 6. The display board 1 comprises a front wall, a rear wall, a left wall, a right wall, an upper wall and a lower wall, and further comprises a supporting mechanism which enables the display board 1 to stand when the left wall and the lower wall of the display board 1 are located below the display board 1, a plurality of transverse and longitudinal grid lines 11 are drawn on the front wall of the display board 1, and the grid lines 11 form a plurality of square grids. The positions corresponding to all the longitudinal grid lines 11 on the upper side of all the grid areas are sequentially marked with scales 12 which are sequentially increased from 0 from left to right, and the positions corresponding to all the transverse grid lines 11 on the right side of all the grid areas are sequentially marked with scales 12 which are sequentially increased from 0 from bottom to top. The upper right portion of the grid area is fixed with a screw 13 on the display board 1, the middle of the pulley body 4 is provided with a sleeve hole capable of being sleeved on the screw 13, and the outer side wall of the pulley body 4 is provided with a ring groove for winding the traction rope 5.

The supporting mechanism comprises a first supporting plate 2 connected with the left wall of the display plate 1 through a hinge on one side and a second supporting plate 3 connected with the lower wall of the display plate 1 through a hinge on one side, so that the first supporting plate 2 and the second supporting plate 3 can be unfolded (shown in figure 2), when the supporting mechanism is not used, the two supporting plates can be combined on the display plate 1, the occupied space is reduced, and the carrying is convenient. The two support plates may be right angle triangular plates. The edge of the first support plate 2 contacting with the left wall and the lower wall of the display plate 1 is a first edge 21, the edge of the second support plate 3 contacting with the left wall and the lower wall of the display plate 1 is a second edge 31, and the first edge 21 and the second edge 31 are detachably connected. The first edge 21 is adhered with a permanent magnet sheet a, the second edge 31 is adhered with a permanent magnet sheet b which is mutually attracted with the permanent magnet sheet a, when the first edge 21 and the second edge 31 lean against each other, the two permanent magnet sheets are mutually attracted, the two supporting plates are fixed together, and no matter which supporting plate is positioned at the lowest part, the supporting plate can play a role in supporting the display plate 1.

As shown in fig. 3: two red rubber bands 51 are sleeved on the traction rope 5, and the rubber bands 51 can be moved to appropriate positions on the traction rope 5, such as two ends of the traction rope 5, so that the positions of the two ends of the traction rope can be conveniently recorded.

As shown in fig. 4-8: the pulley body 4 comprises two menisci 41 and a bar-shaped lever 42, wherein one of the two menisci 41 is detachably connected with the upper end of the bar-shaped lever 42, and the other is detachably connected with the lower end of the bar-shaped lever 42. Meniscus 41 is including an arc wall and the relative flat wall of arc wall, the arc wall shaping of meniscus 41 has limit groove a412, bar lever 42 left end is equipped with limit groove b4212, and the right-hand member is equipped with limit groove c4222, complete annular is constituteed to limit groove a412, b, c. Inserting grooves are respectively formed in the middle of the upper end and the lower end of the strip-shaped lever 42, inserting plates 411 which are inserted into the adjacent inserting grooves are fixedly connected to the flat walls of the half-moon plates 41, and the inserting plates 411 are tightly attached to the inserting grooves, so that the inserting plates and the inserting grooves are tightly connected together. The bar-shaped lever 42 comprises a first rod 421 and a second rod 422 hinged with the first rod 421, and the adjacent ends of the first rod 421 and the second rod 422 are meniscal walls respectively. The end of the first rod 421 away from the second rod 422 is provided with an edge groove b4212, and the end of the second rod 422 away from the first rod 421 is provided with an edge groove c 4222. The middle part of the end of the first rod 421 close to the second rod 422 is connected with a connecting rod 4213, the middle part of the end of the second rod 422 close to the first rod 421 is provided with a connecting groove 4223 for accommodating the connecting rod 4213, and the connecting rod 4213 is tightly attached to the connecting groove 4223, so that the first rod 421 and the second rod 422 are prevented from being rotated relatively easily and can be rotated only by manually pulling. The connecting rod 4213 and the second rod 422 are connected by a pin 43, and the trepan is formed in the middle of the bar-shaped lever 42 (i.e. on the pin 43). The right parts of the upper and lower ends of the first rod 421 are respectively provided with a first groove 4211, the left parts of the upper and lower ends of the second rod 422 are respectively provided with a second groove 4221, and the adjacent first groove 4211 and second groove 4221 form an inserting groove.

Picture peg 411 is often extracted from the inserting groove, so just produces not hard up easily for a long time for meniscus 41 is connected infirm with bar lever 42, here the utility model discloses keep away from the one end bonding permanent magnet of meniscus 41 at picture peg 411, it has the iron sheet that is attracted by the permanent magnet to bond in the inserting groove, so make meniscus 41 and bar lever 42 difficult separation, need artificial separation.

As shown in fig. 1: assemble the backup pad (the first limit of two backup pads is in the same place with the attraction on second limit) and fixed show board (the second backup pad is down), hang the pulley body openly as the fixed pulley in the show board, trepanning cover is on the screw, along pulley body wire-wrapping haulage rope, the end heavy object that hangs of right side haulage rope, remove red thin rubber band to the rope end, instruct heavy object initial position, left side haulage rope end-to-end connection spring dynamometer couple, remove second red thin rubber band to the rope end, instruct rope free end initial position. At the moment, the spring dynamometer is moved, the change size of the moving position and the reading number of the spring scale are recorded, the spring dynamometer is compared with the moving position of the heavy object and the gravity, the tension direction of the spring dynamometer can also be changed for recording and comparing, and the use characteristics of the fixed pulley can be visually recognized. Subsequent sequential separation of the two menisci, as shown in FIG. 9, using the menisci in the manner described above, taking care that the menisci do not rotate by too much, preferably within 180 degrees; as shown in fig. 10, the research is further conducted by using a bar-shaped lever, and the fact that the fixed pulley is an equiarm lever can be researched by simplifying the pulley body into a lever step by step. Meanwhile, the angle between the first rod and the second rod of the strip-shaped lever can be adjusted, as shown in fig. 11, the characteristic that the fixed pulley changes the direction of the force but does not change the magnitude of the force is recognized, and the fixed pulley is also an equal-arm lever in essence.

As shown in fig. 12: the first supporting plate is turned downwards, namely 90 degrees anticlockwise on the basis of fig. 1, the left end of the traction rope is fixed at the position of a fixing screw of the display plate, a heavy object is hung at the center of the pulley body by the rope at the position of a pin shaft, the movable pulley is formed by the traction rope, the right free end is connected with a spring dynamometer, a red thin rubber ring is moved to the tail end of the rope, and the starting position (corresponding scale) of the free end of the rope is indicated. At the moment, the spring dynamometer is vertically moved upwards, the change size (the scale difference corresponding to the front and the back) of the moving position of the free end of the rope and the reading number of the spring scale are recorded, and the moving position of the weight and the gravity are compared, so that the use characteristics of the movable pulley can be recognized. Subsequent sequential separation of the two menisci, as shown in FIG. 13, using the menisci in the manner described above, taking care that the menisci do not rotate by too much, preferably within 180 degrees; as shown in fig. 14, the study was conducted again using a bar-shaped lever alone. Through the above steps, the pulley body is simplified into the lever, and the fact that the movable pulley is a labor-saving lever is researched.

Through the utility model discloses can study the principle and the deep principle of fixed pulley and movable pulley respectively, the student of being convenient for learns and masters the principle of pulley, can expand and come, study corresponding applied knowledge.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and the skilled in the art can carry out the common changes and replacements within the technical solution of the present invention.

Claims

1. Pulley research demonstration appearance, its characterized in that: comprises a display board, a pulley body, a traction rope, a spring dynamometer and a weight; the display board comprises a front wall, a rear wall, a left wall, a right wall, an upper wall and a lower wall, and further comprises a supporting mechanism which enables the display board to stand when the left wall and the lower wall of the display board are positioned below the display board, the front wall of the display board is provided with a plurality of transverse and longitudinal grid lines, and the grid lines form a plurality of square grids; scales which are sequentially increased from 0 are sequentially marked at the positions corresponding to all longitudinal grid lines on the upper side of all the grid areas from left to right, and scales which are sequentially increased from 0 are sequentially marked at the positions corresponding to all transverse grid lines on the right side of all the grid areas from bottom to top; the upper right portion of the grid area is fixed with a screw on the display board, the middle of the pulley body is provided with a trepanning which can be sleeved on the screw, and the outer side wall of the pulley body is provided with a ring groove for winding a traction rope.

2. The pulley study demonstration apparatus of claim 1 wherein: the supporting mechanism comprises a first supporting plate and a second supporting plate, the first supporting plate is connected with the lower portion of the left wall of the display board through a hinge, the second supporting plate is connected with the left portion of the lower wall of the display board through a hinge, the first supporting plate is in contact with the left wall and the lower wall of the display board on one side, the second supporting plate is in contact with the left wall and the lower wall of the display board on the other side, and the first supporting plate and the second supporting plate are detachably connected.

3. The pulley study demonstration apparatus of claim 2 wherein: the first side is adhered with a permanent magnet sheet a, and the second side is adhered with a permanent magnet sheet b mutually attracted with the permanent magnet sheet a.

4. The pulley study demonstration apparatus of claim 1 wherein: two red rubber rings are sleeved on the traction rope.

5. The pulley study demonstration apparatus of claim 1 wherein: the pulley body comprises two menisci and a strip-shaped lever, one of the two menisci is detachably connected with the upper end of the strip-shaped lever, and the other is detachably connected with the lower end of the strip-shaped lever; the meniscus comprises an arc-shaped wall and a flat wall opposite to the arc-shaped wall, a side groove a is formed in the arc-shaped wall of the meniscus, a side groove b is formed in the left end of the strip-shaped lever, a side groove c is formed in the right end of the strip-shaped lever, and the side grooves a, b and c form a complete ring groove; the trepanning is formed in the middle of the strip-shaped lever.

6. The pulley study demonstration apparatus of claim 5 wherein: the middle parts of the upper end and the lower end of the strip-shaped lever are respectively provided with an inserting groove, and the flat wall of each meniscus is fixedly connected with an inserting plate inserted with the adjacent inserting groove.

7. The pulley study demonstration apparatus of claim 5 wherein: the bar-shaped lever comprises a first rod and a second rod hinged with the first rod, and the adjacent ends of the first rod and the second rod are meniscus walls respectively; one end of the first rod, which is far away from the second rod, is provided with an edge groove b, and the end of the second rod, which is far away from the first rod, is provided with an edge groove c; the middle part of the end of the first rod close to the second rod is connected with a connecting rod, and the middle part of the end of the second rod close to the first rod is provided with a connecting groove for accommodating the connecting rod; the connecting rod is connected with the second rod through a pin shaft.

8. The pulley study demonstration apparatus of claim 6 wherein: and a permanent magnet is bonded at one end of the inserting plate, which is far away from the meniscus, and an iron sheet attracted by the permanent magnet is bonded in the inserting groove.