Pulley block mechanical work efficiency experiment teaching aid

Abstract

The invention relates to the field of experiment teaching aids, and particularly discloses a pulley block mechanical work efficiency experiment teaching aid, which comprises a bearing plate, a measuring assembly arranged on the bearing plate, a driving assembly arranged on the bearing plate, and a weighing assembly arranged on the measuring assembly and connected with the driving assembly. The measuring assembly is provided with a loading assembly connected with the weighing assembly, and a locking assembly is arranged between the measuring assembly and the bearing plate. According to the invention, multiple experiment modes are effectively combined, only one teacher can utilize the same set of experiment apparatus to realize rapid switching between a vertical mechanical efficiency work experiment and an inclined plane mechanical efficiency work experiment, data can be rapidly obtained, and during the inclined plane experiment, mechanical efficiency work experiments at different angles can be adapted, so that the experiment efficiency is greatly improved. The time for splicing experiment apparatuses is saved, the teaching rhythm is prevented from being influenced, the experiment demonstration is more sufficient, the understanding of students on the mechanical working principle is enhanced, and the teaching effect is improved.

Description

Technical Field

[0001] This invention relates to the field of experimental teaching aids, and in particular to an experimental teaching aid for the mechanical work efficiency of a pulley system. Background Technology

[0002] During the educational learning stage, students will encounter experiments on the efficiency of mechanical work. The traditional experimental design for mechanical work and mechanical power is as follows: a weight is suspended below a force gauge to measure the weight of the object, and then the object is moved vertically to measure the distance and time it takes to move. The amount of work done can then be calculated. Usually, teachers will use corresponding teaching aids to conduct experiments and demonstrate them to students for their learning, allowing students to dynamically understand the work process.

[0003] Existing patent CN104346976A discloses an essential teacher-student experimental demonstration device for high school physics mechanics experiments. It consists of a demonstration board, a pulley system, and a weight. Its key features are: helping students understand and firmly grasp the following three points regarding mechanical efficiency: ① Mechanical efficiency is unrelated to the amount of effort saved or the height h to which the weight rises; ② Mechanical efficiency is related to the object of work and the internal structure of the mechanism; ③ Effort-saving mechanisms require more distance but not less work, meaning the amount of effort saved and the amount of work done are two different things. Using this invention is both intuitive and visual, cultivating students' hands-on, mental, and verbal abilities, and more importantly, improving their technical literacy.

[0004] The above structure enables experiments on work efficiency. However, in the educational process, teachers need to conduct multiple sets of experiments, demonstrating the work processes of vertical mechanical efficiency and inclined plane mechanical efficiency in class. Since the same set of experimental equipment is used for both vertical and inclined plane mechanical efficiency experiments, teachers need strong hands-on skills in disassembly and assembly. After completing the vertical mechanical efficiency experiment, the equipment must be reassembled before conducting the inclined plane mechanical efficiency experiment. However, class time is limited, and frequent reassembly of equipment is not only time-consuming but also disrupts the teaching rhythm, leading to insufficient experimental demonstrations, unclear student observation, and consequently, affecting the understanding of the principles of mechanical work and reducing teaching effectiveness.

[0005] Therefore, how to provide an experimental teaching tool for the mechanical work efficiency of pulley systems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] One objective of this invention is to provide an experimental teaching aid for the mechanical work efficiency of a pulley system. This experimental teaching aid includes a support plate, a measuring component mounted on the support plate, a driving component mounted on the support plate, a weighing component connected to the driving component mounted on the measuring component, a load-bearing component connected to the weighing component mounted on the measuring component, a locking component between the measuring component and the support plate, and a telescopic component at one end of the measuring component, with a snap-fit ​​connection between the telescopic component and the measuring component. The measuring component has a follower component at one end and a limiting component on the telescopic component to restrict the free movement of the follower component and the measuring component. During demonstrations of vertical and inclined plane mechanical efficiency work experiments, pulling the telescopic component causes the locking component to separate, and simultaneously the limiting component separates. Rotating and moving the measuring component to a suitable position and releasing the telescopic component forces the locking component to engage. The limiting component restricts the movement of the follower component and the measuring component, enabling rapid switching between vertical and inclined plane mechanical efficiency work experiments.

[0007] Preferably, the measuring assembly includes a vertical measuring ruler disposed on the support plate, a rotating rod connected to the vertical measuring ruler by a bearing, a sliding block fixedly sleeved on the rotating rod, and a rotating measuring ruler adapted to the vertical measuring ruler disposed on the sliding block, the sliding block slidingly penetrating the rotating measuring ruler.

[0008] Preferably, the drive assembly includes a fixed plate disposed on the carrier plate, a drive motor mounted on the fixed plate, a drive shaft connected to the fixed plate by a bearing, the drive shaft being connected to the output shaft of the drive motor, and a take-up roller being fixedly sleeved on the drive shaft.

[0009] Preferably, the weighing assembly includes a fixed pulley mounted on the vertical measuring scale, a pull rope wound around the take-up roller, the pull rope being wound around the fixed pulley, and a force gauge being mounted at the end of the pull rope.

[0010] Preferably, the load-bearing component includes a load block disposed at the output end of the force gauge, the load block being used to hold weights, a guide rail being disposed on the rotating measuring ruler, and a roller adapted to the guide rail being connected to a bearing on the load block.

[0011] Preferably, the locking assembly includes a locking plate hinged to the bottom of the rotating measuring scale, a locking screw threadedly connected to the locking plate, and a threaded hole adapted to the locking screw on the bearing plate.

[0012] Preferably, the telescopic assembly includes a telescopic inner cylinder disposed on the vertical measuring ruler, a telescopic outer cylinder slidably disposed on the outer ring of the telescopic inner cylinder, and a telescopic spring disposed between the telescopic outer cylinder and the vertical measuring ruler.

[0013] Preferably, the snap-fit ​​assembly includes a snap-fit ​​gear fixedly sleeved on the outer ring of the rotating rod, a lever plate is provided on the telescopic outer cylinder, and an internal gear ring that meshes with the snap-fit ​​gear is provided in the lever plate. The diameters of the telescopic inner cylinder and the telescopic outer cylinder are both larger than the diameter of the snap-fit ​​gear.

[0014] Preferably, the follower assembly includes a follower disk disposed on the rotating rod, a follower rod disposed on the follower disk, and a follower block disposed on the follower rod that is adapted to the rotating measuring scale.

[0015] Preferably, the limiting assembly includes a rotating ring connected to the telescopic outer cylinder by a bearing, a connecting rod on the rotating ring, a connecting plate on the connecting rod, a limiting rod penetrating the follower block on the connecting plate, a limiting spring sleeved on the outer ring of the limiting rod between the connecting plate and the follower block, and a plurality of limiting holes adapted to the limiting rod on the rotating measuring scale.

[0016] The beneficial effects of this invention are as follows: In the vertical mechanical efficiency work experiment of this invention, one hand pulls the telescopic component, which causes the locking component to separate, and simultaneously causes the limiting component to separate. At this time, the measuring component is in a rotatable and movable state, and the measuring component is unlocked from the follower component. The locking component is released. The other hand rotates the measuring component to a vertical position, forcing it to move to a suitable position. The telescopic component is then released, forcing the locking component to engage with the measuring component, preventing free rotation. At the same time, the telescopic component causes the limiting component to move, thus restricting the free movement of the measuring component. Move the weight to the load-bearing component, then activate the drive component. The drive component moves the weighing component to a suitable height. The measuring component measures the height. Combining this with the time, the pulling force of the weighing component, and the weight of the load-bearing component, the total work, useful work, and vertical work efficiency can be calculated. After completing the experiment, conduct an inclined plane mechanical efficiency work experiment. To save time, a quick switch is required. Similarly, pull the telescopic component with one hand. The telescopic component causes the locking component to separate, and simultaneously causes the limiting component to separate. At this point, the measuring component is in a rotatable and movable state, and the measuring component is... The follow-up component unlocks, releasing the locking component. With the other hand, rotate the measuring component to an inclined position, simultaneously forcing it to move to the appropriate location. Release the telescopic component, forcing the locking component to engage with the measuring component, preventing free rotation. Simultaneously, the telescopic component moves the limiting component, restricting its free movement. Place a weight of the corresponding amount on the load-bearing component and activate the drive component. The drive component moves, causing the weighing component to rise to the appropriate height. Measure the height and displacement of the inclined plane using the measuring component, and combine this data with the time and the pulling force of the weighing component. By analyzing the force and weight of the load-bearing components, the total work, useful work, and efficiency of work done on the inclined plane can be calculated. In summary, this application's experimental teaching aid for the mechanical work efficiency of pulley systems effectively combines multiple experimental modes. A single teacher can use the same set of experimental equipment to quickly switch between vertical mechanical efficiency work experiments and inclined plane mechanical efficiency work experiments, rapidly obtaining data. Furthermore, in inclined plane experiments, it can adapt to mechanical efficiency work experiments at different angles, saving time in assembling experimental equipment, avoiding disruption to the teaching rhythm, making experimental demonstrations more thorough, enhancing students' understanding of the principles of mechanical work, and improving teaching effectiveness. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2This is a three-dimensional structural entity diagram of the present invention from another perspective; Figure 3 For the present invention Figure 1 Partial structural entity diagram; Figure 4 For the present invention Figure 3 Partial structural entity diagram; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a structural schematic diagram of the load-bearing component of the present invention; Figure 7 This is a diagram showing the connection relationship between the telescopic component and the limiting component of the present invention; Figure 8 For the present invention Figure 7 The structural entity diagram in another direction; Figure 9 For the present invention Figure 7 Exploded view; Figure 10 This is a structural diagram of the telescopic component of the present invention.

[0019] In the diagram: 1. Bearing plate; 2. Measuring assembly; 201. Vertical measuring ruler; 202. Rotating rod; 203. Sliding block; 204. Rotating measuring ruler; 3. Drive assembly; 301. Fixed plate; 302. Drive motor; 303. Drive shaft; 304. Take-up roller; 4. Weighing assembly; 401. Fixed pulley; 402. Pull rope; 403. Force gauge; 5. Load assembly; 501. Load block; 502. Guide rail; 503. Roller; 6. Locking assembly; 601. Locking plate; 602. Locking mechanism 603. Screw; 7. Threaded hole; 8. Telescopic assembly; 9. Telescopic inner cylinder; 10. Telescopic outer cylinder; 11. Telescopic spring; 2. Snap-fit ​​assembly; 3. Snap-fit ​​gear; 4. Actuating plate; 5. Internal gear ring; 6. Follower assembly; 7. Follower disc; 8. Follower rod; 9. Follower block; 10. Limiting assembly; 11. Rotating ring; 12. Connecting rod; 13. Connecting plate; 14. Limiting rod; 15. Limiting spring; 16. Limiting hole. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0021] Example 1: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides a teaching aid for experimental work efficiency of pulley systems, comprising a support plate 1, a measuring component 2 and a driving component 3 on the support plate 1, a weighing component 4 connected to the driving component 3 on the measuring component 2, a load component 5 connected to the weighing component 4 on the measuring component 2, a locking component 6 between the measuring component 2 and the support plate 1, a telescopic component 7 at one end of the measuring component 2, a locking component 8 between the telescopic component 7 and the measuring component 2, a follower component 9 at the other end of the measuring component 2, and a limiting component 10 on the telescopic component 7 to restrict the free movement of the follower component 9 and the measuring component 2. When demonstrating vertical and inclined plane mechanical efficiency work experiments, pulling the telescopic component 7 causes the locking component 8 to separate, and simultaneously the limiting component 10 separates. Rotating and moving the measuring component 2 to a suitable state and releasing the telescopic component 7 forces the locking component 8 to engage. The limiting component 10 limits the follower component 9 and the measuring component 2, enabling rapid switching between vertical and inclined plane mechanical efficiency work experiments.

[0022] Working principle: During the vertical mechanical efficiency work experiment, one hand pulls the telescopic component 7, which causes the locking component 8 to separate. Simultaneously, the telescopic component 7 causes the limiting component 10 to separate. At this time, the measuring component 2 is in a rotatable and movable state, and the measuring component 2 is unlocked from the follower component 9, releasing the locking component 6. The other hand rotates the measuring component 2 to a vertical position, forcing it to move to a suitable position. The telescopic component 7 is then released, forcing the locking component 8 to engage with the measuring component 2, preventing free rotation. Simultaneously, the telescopic component 7 causes the limiting component 10 to move, thus... Restricting the free movement of measuring component 2, a weight of corresponding weight is placed on load component 5. The drive component 3 is activated, causing the weighing component 4 to move upwards to a reasonable height. The height is measured using measuring component 2. Combined with the time, the pulling force of weighing component 4, and the weight of load component 5, the total work, useful work, and vertical work efficiency can be calculated. After completing the experiment, an inclined plane mechanical efficiency work experiment is conducted. To save time, a rapid switch is required. Similarly, one hand pulls the telescopic component 7, causing the locking component 8 to separate. Simultaneously, the telescopic component 7 causes the limiting component 10 to separate. At this point, measuring component 2 is in a rotatable and movable state. The measuring component 2 is in a tilted state, and the follower component 9 is unlocked. The locking component 6 is released, and the measuring component 2 is rotated to a tilted state with the other hand, forcing the measuring component 2 to move to a reasonable position. The telescopic component 7 is released, forcing the locking component 8 to lock the measuring component 2, preventing the measuring component 2 from rotating freely. At the same time, the telescopic component 7 drives the limiting component 10 to move, so that the limiting component 10 restricts the free movement of the measuring component 2. A weight of the corresponding weight is placed on the load component 5, and the drive component 3 is activated. The drive component 3 moves and moves the weighing component 4 to a reasonable height. The measuring component 2 is used to measure the height value of the upward movement and the position of the inclined plane. By combining the values ​​of time, the pulling force of the weighing component 4, and the weight of the load component 5, the total work, useful work, and the efficiency of work done on the inclined plane can be calculated. In summary, the pulley system mechanical work efficiency experimental teaching aid of this application effectively combines multiple experimental modes. Only one teacher can use the same set of experimental equipment to quickly switch between vertical mechanical efficiency work experiments and inclined plane mechanical efficiency work experiments, obtain data quickly, and adapt to mechanical efficiency work experiments at different angles when conducting inclined plane experiments. This saves time in assembling experimental equipment, avoids affecting the teaching rhythm, makes the experimental demonstration more thorough, enhances students' understanding of the principle of mechanical work, and improves teaching effectiveness.

[0023] Example 2: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides an experimental teaching tool for the mechanical work efficiency of a pulley system. The measuring component 2 includes a vertical measuring ruler 201 mounted on a support plate 1. A rotating rod 202 is connected to the vertical measuring ruler 201 by a bearing. A sliding block 203 is fixedly sleeved on the rotating rod 202. A rotating measuring ruler 204 adapted to the vertical measuring ruler 201 is mounted on the sliding block 203. The sliding block 203 slides through the rotating measuring ruler 204.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides a pulley block mechanical work efficiency experimental teaching tool. The drive assembly 3 includes a fixed plate 301 disposed on a support plate 1, a drive motor 302 mounted on the fixed plate 301, a drive shaft 303 connected to the fixed plate 301 by a bearing, the drive shaft 303 being connected to the output shaft of the drive motor 302, and a take-up roller 304 fixedly sleeved on the drive shaft 303.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides a mechanical work efficiency test teaching tool for a pulley system. The weighing component 4 includes a fixed pulley 401 mounted on a vertical measuring ruler 201, a pull rope 402 wound around a winding roller 304, the pull rope 402 being wound around the fixed pulley 401, and a force gauge 403 mounted at the end of the pull rope 402.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the present invention provides a pulley system mechanical work efficiency experimental teaching tool. The load component 5 includes a load block 501 set at the output end of the force gauge 403. The load block 501 is used to place weights. A guide rail 502 is set on the rotating measuring ruler 204. A roller 503 adapted to the guide rail 502 is connected to the load block 501 by a bearing.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides a pulley block mechanical work efficiency experimental teaching tool. The locking assembly 6 includes a locking plate 601 hinged to the bottom of the rotating measuring ruler 204. A locking screw 602 is threadedly connected to the locking plate 601. A threaded hole 603 adapted to the locking screw 602 is provided on the bearing plate 1.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides an experimental teaching tool for the mechanical work efficiency of a pulley system. The telescopic component 7 includes a telescopic inner cylinder 701 disposed on a vertical measuring ruler 201, a telescopic outer cylinder 702 slidably disposed on the outer ring of the telescopic inner cylinder 701, and a telescopic spring 703 disposed between the telescopic outer cylinder 702 and the vertical measuring ruler 201.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides an experimental teaching tool for the mechanical work efficiency of a pulley system. The locking assembly 8 includes a locking gear 801 fixedly sleeved on the outer ring of the rotating rod 202. A toggle plate 802 is provided on the telescopic outer cylinder 702. An inner gear ring 803 that meshes with the locking gear 801 is provided in the toggle plate 802. The diameters of both the telescopic inner cylinder 701 and the telescopic outer cylinder 702 are larger than the diameter of the locking gear 801.

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides an experimental teaching tool for the mechanical work efficiency of a pulley system. The follower component 9 includes a follower disk 901 disposed on a rotating rod 202, a follower rod 902 disposed on the follower disk 901, and a follower block 903 disposed on the follower rod 902 that is adapted to the rotating measuring ruler 204.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention provides an experimental teaching tool for the mechanical work efficiency of a pulley system. The limiting component 10 includes a rotating ring 1001 connected to a telescopic outer cylinder 702 by a bearing. A connecting rod 1002 is provided on the rotating ring 1001. A connecting plate 1003 is provided on the connecting rod 1002. A limiting rod 1004 passing through a follower block 903 is provided on the connecting plate 1003. A limiting spring 1005 sleeved on the outer ring of the limiting rod 1004 is provided between the connecting plate 1003 and the follower block 903. A plurality of limiting holes 1006 adapted to the limiting rod 1004 are provided on the rotating measuring ruler 204.

[0032] Working principle: During the vertical mechanical efficiency work experiment, one hand pulls the actuating plate 802, which causes the telescopic outer cylinder 702 to slide on the telescopic inner cylinder 701. The telescopic spring 703 pulls the rope 402, and at the same time, the actuating plate 802 causes the inner gear ring 803 to move along the locking gear 801, causing the locking gear 801 to separate from the inner gear ring 803. At this time, the rotating rod 202 is in a rotatable state. The movement of the telescopic outer cylinder 702 drives the rotating ring 1001 to move, and the rotating ring 1001 drives the connecting rod 1002 and the connecting plate 1003 to move, connecting... Plate 1003 drives the limiting rod 1004 to move, forcing the limiting rod 1004 to slide out of the limiting hole 1006. The limiting spring 1005 pulls the rope 402. At this time, the follower block 903 separates from the rotating measuring scale 204, that is, the rotating measuring scale 204 is in a movable state. Rotating the locking screw 602 separates the locking screw 602 from the threaded hole 603, and separates the locking piece 601 from the bearing plate 1. The other hand quickly pulls the rotating measuring scale 204, so that the rotating measuring scale 204 moves along the sliding block 203 to a reasonable position, that is, a reasonable vertical displacement value. When the measuring scale 204 is forced to rotate vertically, the rotating rod 202 drives the follower plate 901, follower rod 902, and follower block 903 to rotate synchronously. The follower block 903 drives the rotating ring 1001, connecting rod 1002, connecting plate 1003, limit rod 1004, and limit spring 1005 to rotate synchronously. The actuating plate 802 and telescopic outer cylinder 702 are released, causing the actuating plate 802 to drive the inner gear ring 803 to mesh and engage with the locking gear 801, preventing the measuring scale 204 from rotating freely. Simultaneously, under the action of the telescopic spring 703, the telescopic outer cylinder 702... 02. The telescopic inner cylinder 701 retracts, causing the telescopic outer cylinder 702 to drive the rotating ring 1001 to retract. The rotating ring 1001 drives the connecting rod 1002 and the connecting plate 1003 to retract, forcing the connecting plate 1003 to drive the limiting rod 1004 to insert into the corresponding limiting hole 1006. This forces the follower block 903 to form a locking limit with the rotating measuring ruler 204, preventing the rotating measuring ruler 204 from moving freely. Then, the locking screw 602 is rotated again, causing the locking screw 602 to be threaded into the threaded hole 603, so that the locking plate 601 and the bearing plate 1 form an integral whole, improving stability. Place the corresponding weight on the load block 501, start the drive motor 302, the output shaft of the drive motor 302 rotates and drives the drive shaft 303 to rotate, the drive shaft 303 rotates and drives the winding roller 304 to rotate, the winding roller 304 rotates and drives the pull rope 402 to wind up, forcing the pull rope 402 to pass over the fixed pulley 401, so that the pull rope 402 pulls the force gauge 403, so that the force gauge 403 pulls the load block 501 and the weight upward. Since the load block 501 is vertical, the frictional resistance of the roller 503 rolling on the guide rail 502 can be ignored. Use the vertical measuring ruler 201 and the rotating measuring ruler 204 to obtain the upward height value. Combine the time, the pulling force value of the force gauge 403 and the weight value of the load block 501 and the corresponding weight, the total work, useful work and vertical work efficiency can be calculated. After completing the experiment, a work efficiency experiment on the inclined plane is conducted. To save time, a quick switch is required. Similarly, one hand pulls the actuating plate 802, which causes the telescopic outer cylinder 702 to slide on the telescopic inner cylinder 701. The telescopic spring 703 pulls the rope 402, and at the same time, the actuating plate 802 causes the inner gear ring 803 to move along the locking gear 801, causing the locking gear 801 to separate from the inner gear ring 803. At this time, the rotating rod 202 is in a rotatable state. The movement of the telescopic outer cylinder 702 causes the rotating ring 1001 to move, and the rotating ring 1001 drives the connecting rod 1002 and the connecting plate. Movement 1003 causes the connecting plate 1003 to move, driving the limiting rod 1004 to slide out of the limiting hole 1006. The limiting spring 1005 pulls the rope 402, at which point the follower block 903 separates from the rotating measuring scale 204, meaning the rotating measuring scale 204 is in a movable state. Rotating the locking screw 602 separates the locking screw 602 from the threaded hole 603, causing the locking piece 601 to separate from the bearing plate 1. With the other hand, quickly rotate the rotating measuring scale 204 to a reasonable angle, while simultaneously pushing the rotating measuring scale 204 so that it moves along the sliding block. 203 moves to a reasonable position, i.e., a reasonable displacement value in the tilt direction. Simultaneously, rotating rod 202 drives the follower disc 901, follower rod 902, and follower block 903 to rotate synchronously. Follower block 903 drives rotating ring 1001, connecting rod 1002, connecting plate 1003, limiting rod 1004, and limiting spring 1005 to rotate synchronously. The actuating plate 802 and telescopic outer cylinder 702 are released, causing the actuating plate 802 to drive the inner gear ring 803 to mesh and engage with the locking gear 801, preventing the measuring ruler 204 from rotating freely. Simultaneously, under the action of the telescopic spring 703, the telescopic outer cylinder 702... 02. The telescopic inner cylinder 701 retracts, causing the telescopic outer cylinder 702 to drive the rotating ring 1001 to retract. The rotating ring 1001 drives the connecting rod 1002 and the connecting plate 1003 to retract, forcing the connecting plate 1003 to drive the limiting rod 1004 to insert into the corresponding limiting hole 1006. This forces the follower block 903 and the rotating measuring ruler 204 to form a locking limit again, preventing the rotating measuring ruler 204 from moving freely. The locking screw 602 is rotated again, causing the locking screw 602 to be threaded into another corresponding threaded hole 603, so that the locking piece 601 and the bearing plate 1 form a whole again. A weight of the corresponding weight is placed on the load block 501. The drive motor 302 is started. The output shaft of the drive motor 302 rotates, which drives the drive shaft 303 to rotate. The drive shaft 303 rotates, which drives the winding roller 304 to rotate. The winding roller 304 rotates, which drives the pull rope 402 to wind up, forcing the pull rope 402 to pass over the fixed pulley 401. This causes the pull rope 402 to pull the force gauge 403, which in turn pulls the load block 501 and the weight to tilt upwards along the guide rail 502. Since the roller 503 rolls on the guide rail 502, the rolling friction is small. The vertical measuring ruler 201 is used to obtain the height value of the upward movement, and the rotating measuring ruler 204 is used to obtain the displacement value of the inclined plane. By combining the time, the pulling force of the force gauge 403, and the weight values ​​of the load block 501 and the corresponding weight, the total work, the useful work, and the work efficiency of the inclined plane can be calculated.

[0033] This scheme effectively combines multiple experimental modes, allowing a single teacher to utilize the same set of experimental equipment. On the one hand, it enables rapid switching between experiments on the efficiency of work in vertical directions and those on inclined planes, facilitating quick data acquisition. On the other hand, during inclined plane experiments, it can adapt to experiments on the efficiency of work at different angles, saving time in assembling experimental equipment, avoiding disruption to the teaching pace, making experimental demonstrations more thorough, enhancing students' understanding of the principles of mechanical work, and improving teaching effectiveness.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pulley block mechanical work efficiency experiment teaching aid, characterized in that, The utility model provides a vertical and inclined plane mechanical efficiency working experiment demonstration device, including the bearing plate (1), be provided with the measurement assembly (2) on the bearing plate (1), be provided with the drive assembly (3) on the bearing plate (1), be provided with the weighing assembly (4) with drive assembly (3) is connected on the measurement assembly (2), be provided with the load assembly (5) with weighing assembly (4) is connected on the measurement assembly (2), be provided with locking assembly (6) between the measurement assembly (2) with bearing plate (1), one end of measurement assembly (2) is provided with telescopic assembly (7), be provided with the clamping assembly (8) between telescopic assembly (7) with measurement assembly (2), the other end of measurement assembly (2) is provided with follow-up assembly (9), be provided with the limiting assembly (10) for limiting follow-up assembly (9) with the free movement of measurement assembly (2) on telescopic assembly (7);When demonstrating vertical and inclined plane mechanical efficiency working experiment, pull telescopic assembly (7), make clamping assembly (8) separate, limiting assembly (10) separates simultaneously, rotate and move measurement assembly (2) to reasonable state, release telescopic assembly (7), force clamping assembly (8) to form clamping, limiting assembly (10) to the limiting of follow-up assembly (9) with measurement assembly (2), realize the quick switching of vertical and inclined plane mechanical efficiency working experiment.

2. The pulley block mechanical work efficiency experiment teaching aid according to claim 1, characterized in that, The measurement assembly (2) includes a vertical measuring scale (201) disposed on the bearing plate (1), a rotating rod (202) is connected to the vertical measuring scale (201) through a bearing, a sliding block (203) is fixedly sleeved on the rotating rod (202), a rotating measuring scale (204) matched with the vertical measuring scale (201) is disposed on the sliding block (203), and the sliding block (203) slides through the rotating measuring scale (204).

3. The pulley block mechanical work efficiency experiment teaching aid according to claim 2, characterized in that, The drive assembly (3) includes a fixed plate (301) disposed on the bearing plate (1), a drive motor (302) is installed on the fixed plate (301), a drive shaft (303) is connected to the fixed plate (301) through a bearing, the drive shaft (303) is connected to an output shaft of the drive motor (302), and a winding roller (304) is fixedly sleeved on the drive shaft (303).

4. The pulley block mechanical efficiency experiment teaching aid according to claim 3, characterized in that, The weighing assembly (4) includes a fixed pulley (401) disposed on the vertical measuring scale (201), a pull rope (402) is wound on the winding roller (304), the pull rope (402) is wound around the fixed pulley (401), and a force meter (403) is disposed at an end of the pull rope (402).

5. The pulley block mechanical efficiency experiment teaching aid according to claim 4, characterized in that, The load assembly (5) includes a load block (501) disposed at an output end of the force meter (403), the load block (501) is used for placing weights, a guide rail (502) is disposed on the rotating measuring scale (204), and a roller (503) matched with the guide rail (502) is connected to the load block (501) through a bearing.

6. The pulley block mechanical efficiency experiment teaching aid according to claim 5, characterized in that, The locking assembly (6) comprises a locking sheet (601) hingedly arranged at the bottom of the rotation measuring scale (204), a locking screw (602) is threadedly connected to the locking sheet (601), and a threaded hole (603) compatible with the locking screw (602) is formed in the bearing plate (1).

7. The pulley block mechanical efficiency experiment teaching aid according to claim 6, characterized in that, The telescopic assembly (7) comprises a telescopic inner cylinder (701) arranged on the vertical measuring scale (201), a telescopic outer cylinder (702) is slidingly arranged at the outer ring of the telescopic inner cylinder (701), and a telescopic spring (703) is arranged between the telescopic outer cylinder (702) and the vertical measuring scale (201).

8. The pulley block mechanical efficiency experiment teaching aid according to claim 7, characterized in that, The clamping assembly (8) comprises a clamping gear (801) fixedly sleeved at the outer ring of the rotation rod (202), a driving plate (802) is arranged on the telescopic outer cylinder (702), an internal gear ring (803) compatible with the clamping gear (801) is formed in the driving plate (802), and the diameters of the telescopic inner cylinder (701) and the telescopic outer cylinder (702) are greater than the diameter of the clamping gear (801).

9. The pulley block mechanical efficiency experiment teaching aid according to claim 8, characterized in that, The following component (9) comprises a follower disc (901) arranged on the rotation rod (202), a follower rod (902) is arranged on the follower disc (901), and a follower block (903) compatible with the rotation measuring scale (204) is arranged on the follower rod (902).

10. The pulley block mechanical efficiency experiment teaching aid according to claim 9, characterized in that, The limiting assembly (10) comprises a rotating ring (1001) bearing-connected to the telescopic outer cylinder (702), a connecting rod (1002) is arranged on the rotating ring (1001), a connecting plate (1003) is arranged on the connecting rod (1002), a limiting rod (1004) penetrating through the follower block (903) is arranged on the connecting plate (1003), a limiting spring (1005) sleeved at the outer ring of the limiting rod (1004) is arranged between the connecting plate (1003) and the follower block (903), and a plurality of limiting holes (1006) compatible with the limiting rod (1004) are formed in the rotation measuring scale (204).

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