Suspension cable pulley mechanics demonstration board

Abstract

The utility model discloses a kind of demonstration board of cable pulley mechanics, specifically for the technical field of mechanics teaching aid, including rectangular flat plate of mounting plate, moving frame is L-shaped batten, moving frame is installed in rectangular flat plate by fixed bolt;Two sides front side of moving frame are equipped with slide rail, and two sides slide rail are slidably connected with sliding block;The vertical edge of moving frame is close to the side of mounting plate and is equipped with through slot;Sliding block is slidably connected in through slot inside with push rod, and push rod is equipped with the inner slide groove of horizontal arrangement in the side away from mounting plate, limit guide block is installed between push rod and through slot, limit guide block is slidably connected in inner slide groove in the side close to mounting plate, and push rod is fixed with magnetic block inside towards mounting plate;Any sliding block is rotatably connected with dynamometer in the side away from moving frame, and two dynamometer measuring ends are respectively fixed with the end of string, and the hook of string rolling connection or hooking is connected with hook code, and abstract "dead knot" and "live knot" are concretized as visual dynamic experiment process by actual operation.

Description

Technical Field

[0001] This utility model relates to the field of mechanical teaching aids, and more specifically, to a suspension pulley mechanical demonstration board. Background Technology

[0002] In high school physics experiments, the mechanical properties of "dead knots" and "live knots" are a difficult point in the teaching process. As an extension of force analysis problems, the concepts of "dead knots" and "live knots" are difficult to understand because the forces are not intuitive. Therefore, it is necessary to use teaching aids for demonstration.

[0003] However, the following problems exist when using existing teaching aids: 1. It is difficult to apply horizontal lateral force, making force analysis inconvenient; 2. The force display is not intuitive; 3. It is difficult to conduct repeated experiments from multiple angles; 4. It is inconvenient to switch between "dead knot" and "slip knot". Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, this utility model provides a suspension pulley mechanics demonstration board, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a suspension pulley mechanics demonstration board, comprising a mounting plate and a movable frame fixed to the mounting plate. The mounting plate is a rectangular flat plate, and the movable frame is an L-shaped strip. The movable frame is mounted to the rectangular flat plate by fixing bolts, and the two sides of the movable frame are parallel to the edges of the mounting plate. The front sides of the movable frame are provided with slide rails, and sliding blocks are slidably connected to the slide rails on both sides. The sliding blocks are L-shaped blocks, and a positioning bolt is threaded to the side away from the slide rail. A through groove is opened on the vertical side of the movable frame near the mounting plate, and a rectangular section is opened on the side of the through groove facing the movable frame. A push rod is slidably connected inside the through groove. A horizontally arranged inner sliding groove is opened on the side of the push rod away from the mounting plate. A limit guide block is installed between the push rod and the through groove. The limit guide block is slidably connected to the inner sliding groove on the side near the mounting plate. The side of the limit guide block away from the mounting plate is rectangular and slidably connected inside the through groove. A magnetic block is fixed to the inside of the push rod facing the mounting plate. A force gauge is rotatably connected to the side of each sliding block away from the moving frame. The measuring ends of the two force gauges are respectively fixedly connected to the two ends of a rope. The rope is used to connect a type of suspended object, which includes a pulley with rolling connection and a hook weight.

[0006] As a further preferred embodiment of this invention, a weight is attached below the pulley to increase the overall weight of the pulley structure and increase the amount of comparative experiments.

[0007] As a further preferred embodiment of this utility model, the projection line of the position of the rope when it is straightened relative to the mounting plate is used as a marking line, and the marking line serves as a reference line to facilitate the judgment of the rope angle.

[0008] As a further preferred embodiment of this utility model, the end of the push rod away from the magnetic block is threaded with an anti-loosening bolt, and the end of the push rod away from the magnetic block is connected with a push-pull force gauge to facilitate the measurement of push-pull force.

[0009] As a further preferred embodiment of this invention, the magnetic block extends away from the mounting plate to a vertical plane parallel to the mounting plate where the hook is located, thus preventing the pushing and pulling force from shifting back and forth.

[0010] As a further preferred embodiment of this utility model, a plumb line parallel to the side is drawn on the front side of the mounting plate, and a weight with a rope is fixed at the upper end of the plumb line to avoid unnecessary influence on the measurement caused by the direction of gravity not being parallel to the vertical side of the moving frame.

[0011] As a further preferred embodiment of this invention, a double-layer magnetic blackboard sticker is fixed to the back side of the mounting plate for easy installation.

[0012] As a further preferred embodiment of this invention, the L-shaped end of the movable frame is closed to prevent the sliding block from detaching after installation.

[0013] As a further preferred embodiment of this invention, the inner groove is a dovetail groove to ensure a smooth sliding effect.

[0014] As a further preferred embodiment of this utility model, the force gauge is a pressure-transformer electronic force gauge, and the front side of the movable frame is marked with scale lines to reduce the error caused by the deformation of the force gauge in the experiment. The setting of the scale lines makes it easier to obtain the horizontal distance between the two force gauges, and thus facilitates the calculation and experiment.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. Highly intuitive: The abstract concepts of "dead knots" and "live knots" are visualized and transformed into dynamic experimental processes through hands-on activities, allowing students to observe the changes in physical phenomena firsthand and enhancing their intuitive understanding of the knowledge.

[0017] 2. Easy to operate: It is easy to adjust experimental variables such as spacing, mass, and lateral force, and to personally observe the changes in force under different variable conditions, with real-time feedback, which fully satisfies students' desire for exploration. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1This is a three-dimensional view of a suspension pulley mechanics demonstration board according to the present invention.

[0020] Figure 2 This is a front view of a suspension pulley mechanics demonstration board according to the present invention.

[0021] Figure 3 This is a front view of the force gauge in this utility model, which is adjusted in both horizontal and vertical directions and has a hanging weight.

[0022] Figure 4 This is a front view of the force gauge in this utility model, which has its horizontal and vertical positions adjusted and the hook suspended from the pulley.

[0023] Figure 5 This is a front view of the adjustment of the horizontal and vertical positions of the force gauge when the hook weight is suspended from the pulley and subjected to a horizontal external force by the push rod in this utility model.

[0024] Figure 6 for Figure 4 A schematic diagram of the cross-section at point AA.

[0025] The attached diagram is labeled as follows: 1. Movable frame; 2. Fixing bolt; 3. Through groove; 4. Mounting plate; 5. Sliding block; 6. Positioning bolt; 7. Push rod; 8. Inner slide groove; 9. Anti-detachment bolt; 10. Slide rail; 11. Force gauge; 12. Weight with rope; 13. Magnetic block; 14. Pulley; 15. Plumb line; 16. Hook; 17. Rope; 18. Marking line; 19. Limiting guide block; 20. Push-pull force gauge. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See Figure 1-5 As shown, a suspension pulley mechanics demonstration board includes a mounting plate 4 and a movable frame 1 fixed to the mounting plate 4. The mounting plate 4 is a rectangular flat plate, and a double-layer magnetic blackboard sticker is fixed to the back of the mounting plate 4 for easy installation onto a blackboard. The movable frame 1 is an L-shaped strip, and the L-shaped end of the movable frame 1 is closed. The movable frame 1 is installed on the rectangular flat plate by fixing bolts 2, and the two sides of the movable frame 1 are parallel to the edge of the mounting plate 4.

[0028] The movable frame 1 is provided with slide rails 10 on both front sides, and slide blocks 5 are slidably connected to the slide rails 10 on both sides. The slide blocks 5 are L-shaped blocks, and a positioning bolt 6 is threadedly connected to the side away from the slide rails 10. A through groove 3 is opened on the vertical side of the movable frame 1 near the mounting plate 4, and a rectangle is opened on the side of the through groove 3 facing the movable frame 1.

[0029] A push rod 7 is slidably connected inside the through groove 3. An anti-loosening bolt 9 is threadedly connected to the end of the push rod 7 away from the magnetic block 13. A push-pull force gauge 20 is connected to the end of the push rod 7 away from the magnetic block 13. A horizontally set inner sliding groove 8 is opened on the side of the push rod 7 away from the mounting plate 4. The inner sliding groove 8 is a dovetail groove. A limiting guide block 19 is installed between the push rod 7 and the through groove 3. The limiting guide block 19 is slidably connected to the inner sliding groove 8 on the side closer to the mounting plate 4. The side of the limiting guide block 19 away from the mounting plate 4 is rectangular. The rectangular restriction allows the limiting guide block 19 to move horizontally left and right and is slidably connected inside the through groove 3. A magnetic block 13 is fixed to the inside of the push rod 7 facing the mounting plate 4.

[0030] Each of the sliding blocks 5 is rotatably connected to a force gauge 11 on the side away from the moving frame 1. The force gauge 11 is a pressure-transformer electronic force gauge 11, which is used to reduce the error caused by the deformation of the force gauge 11 in the experiment. The measuring ends of the two force gauges 11 are respectively fixedly connected to the two ends of the rope 17. The rope 17 is used to connect a type of suspended object. The suspended object includes a pulley 14 that is rolled and connected and a hook 16 that is hung. The rope 17 is a kite line.

[0031] In the operation of this utility model, by adjusting the positions of the two sliding blocks 5 in the horizontal and vertical directions, the corresponding force gauge 11 is adjusted, and the position of the sliding block 5 is locked by the positioning bolt 6. By rotating the force gauge 11 so that its measuring end is coaxial with the rope 17, and by changing the suspension object, multiple force measurement experiments on the force of the "dead knot" and "slip knot" can be completed.

[0032] like Figure 3 As shown, during the operation of this utility model, when the suspended object is the hook weight 16, the frictional force cannot be ignored, and it is in a dead knot state. By repeatedly adjusting the dynamometer 11 that moves laterally and the dynamometer 11 that moves longitudinally, the hook weight can be in a balanced state in multiple positions. By observing the readings of the dynamometer and the positions of the rope 17 and the marking line 18, it can be concluded that when maintaining a stable position, the angles of the ropes on both sides of the hook weight 16 in the dead knot state are different, and the forces are different, thus completing the static balance experiment of the "dead knot".

[0033] like Figure 4As shown, during the operation of this utility model, when the hook weight 16 is suspended by the pulley 14, it is in a slip knot state. By fixing the horizontally moving force gauge 11 and adjusting the vertically moving force gauge, it can be observed that the reading of the force gauge 11 remains unchanged. It can also be observed that the rope on the right side of the pulley coincides with the marked line, that is, the angle remains unchanged. It can be concluded that when the horizontally moving force gauge 11 is fixed and the stable position is maintained, the force angle on both sides remains unchanged. Furthermore, the horizontal adjustment can be repeatedly performed to obtain that the force on both sides is the same in the slip knot state, and the angle between the rope on the left and right sides of the pulley and the vertical line is the same, thereby completing the dynamic balance experiment.

[0034] Furthermore, since the horizontal part of the moving frame 1 has a scale, the sine of the angle between the rope and the vertical direction can be determined by measuring the horizontal distance between the two force gauges and the rope length. Given that the mass of the weight 16 and the pulley 14 is known, the tension of the rope 17 can be obtained, thus completing the theoretical verification of the experiment.

[0035] Furthermore, by attracting the magnetic block 13 and the hook 16 together, and by pushing and pulling the force gauge 20 from left and right, an experiment was conducted to test the change of force between the "dead knot" and the "live knot" under the influence of a horizontal external force.

[0036] like Figure 1 As shown in this embodiment of the utility model, a plumb line 15 parallel to the side is drawn on the front side of the mounting plate 4, and a weight 12 with a rope is fixed at the upper end of the plumb line 15 to avoid unnecessary influence on the measurement caused by the direction of gravity not being parallel to the vertical side of the moving frame 1.

[0037] During the operation of this utility model, when installing it, it is necessary to ensure that the projection of the rope of the weight 12 with rope coincides with the plumb line.

[0038] like Figure 3-5 As shown, during the operation of this utility model, the projection line of the position of the rope 17 when it is straightened relative to the mounting plate 4 is used as the marking line 18, which facilitates the calculation of the force and experimental verification.

[0039] like Figure 5 As shown, during the operation of this utility model, weights 16 can be added or removed below the pulley 14 to increase the overall weight of the pulley 14 and increase the amount of comparative experiments.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A suspension pulley mechanics demonstration board, comprising a mounting plate and a movable frame fixed to the mounting plate, characterized in that: The mounting plate is a rectangular flat plate, and the movable frame is an L-shaped strip plate. The movable frame is installed on the rectangular flat plate by fixing bolts, and the two sides of the movable frame are parallel to the edge of the mounting plate. The movable frame is provided with slide rails on both front sides, and slide blocks are slidably connected to the slide rails on both sides. The slide blocks are L-shaped blocks, and a positioning bolt is threadedly connected to the side away from the slide rail. A through groove is opened on the vertical side of the movable frame near the mounting plate, and a rectangle is opened on the side of the through groove facing the movable frame. A push rod is slidably connected inside the through groove. A horizontally set inner sliding groove is opened on the side of the push rod away from the mounting plate. A limit guide block is installed between the push rod and the through groove. The limit guide block is slidably connected to the inner sliding groove on the side closer to the mounting plate. The side of the limit guide block away from the mounting plate is rectangular and slidably connected inside the through groove. A magnetic block is fixed to the inside of the push rod facing the mounting plate. Each of the sliding blocks is rotatably connected to a force gauge on the side away from the moving frame. The measuring ends of the two force gauges are respectively fixedly connected to the two ends of a rope. The rope is used to connect a suspended object, which includes a pulley that is rotatably connected to the rope and a hook that is hooked to the rope.

2. The suspension pulley mechanics demonstration board according to claim 1, characterized in that: Weights are attached to the bottom of the pulley.

3. The suspension pulley mechanics demonstration board according to claim 1, characterized in that: The projection line of the rope's position relative to the mounting plate when it is straightened serves as a marker line.

4. The suspension pulley mechanics demonstration board according to claim 1, characterized in that: The end of the push rod away from the magnetic block is threaded with an anti-loosening bolt, and the end of the push rod away from the magnetic block is connected to a push-pull force gauge.

5. A suspension pulley mechanics demonstration board according to claim 1, characterized in that: The magnet extends away from the mounting plate to the vertical plane parallel to the mounting plate where the hook is located.

6. A suspension pulley mechanics demonstration board according to claim 1, characterized in that... A plumb line parallel to the side is drawn on the front side of the mounting plate, and a weight with a rope is fixed at the upper end of the plumb line.

7. The suspension pulley mechanics demonstration board according to claim 1, characterized in that: The mounting plate has a double-layer magnetic blackboard sticker fixed to its back.

8. The suspension pulley mechanics demonstration board according to claim 1, characterized in that: The L-shaped end of the mobile frame is closed.

9. A suspension pulley mechanics demonstration board according to claim 1, characterized in that: The inner groove is a dovetail groove.

10. A suspension pulley mechanics demonstration board according to claim 1, characterized in that: The force gauge is a pressure-variable electronic force gauge, and the front side of the movable frame is marked with scale lines.

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