Portable force arm dynamic teaching device
By combining components such as tracks, spring balances, and transparent sliding sleeves, the dynamic teaching device for lever arms achieves multi-directional adjustment and intuitive display, solving the problems of balance adjustment and numerical representativeness of existing devices, and helping students to correctly understand the concept of lever arms.
Patent Information
- Application Number
- CN202422891098.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing lever arm teaching devices require adjustment to a horizontal position for balance during experiments. The lever arm values are generally integers and not representative, failing to intuitively demonstrate the lever arm and leading students to form incorrect first impressions.
Using a track, spring balance, gravity weights, fixing plate and mounting components, combined with a magnetic base and transparent sliding sleeve, the device can achieve multi-directional adjustment and dynamic display. By observing the change of the lever arm through the inclined spring balance, and combining the principle of two-force balance, the dynamic process of the lever arm can be intuitively demonstrated.
Through dynamic demonstrations and mathematical analysis, students can intuitively understand the essence of the lever arm, establish a correct first impression, form a physical model of the lever arm, and improve the accuracy of their understanding of the concept of the lever arm.
Smart Images
Figure CN223665107U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to teaching equipment technical field especially, relates to a portable force arm dynamic teaching device. BACKGROUND
[0002] The force arm dynamic teaching device is an educational tool used to help students understand and master the concept of force arm in mechanics and its dynamic changes in practical applications.
[0003] Chinese patent publication number CN213751566U, published on 20210720, discloses a lever principle knowledge popular science teaching device, which comprises a drawer box, a fixed rod movably connected to the top of the drawer box, and a mounting slot penetrating through the front to the back of the drawer box, an adjusting screw and two positioning slides movably inserted into the mounting slot, the two positioning slides are movably connected to the adjusting screw, an adjusting rod movably sleeved on the two positioning slides, a tooth groove formed in the top surface of the inner wall of the adjusting rod, a through groove penetrating through the inner wall of the adjusting rod on one side, and a sliding groove formed in the other side of the inner wall of the adjusting rod, a sliding rod movably inserted into the through groove and slidingly connected in the sliding groove, and a lifting ring, an adjusting gear, a limiting block and a positioning gear movably sleeved on the sliding rod.
[0004] The existing force arm teaching device has the following limitations: (1) it needs to be adjusted to a horizontal position for balance before experiment, otherwise it is difficult to accurately measure the value of force arm; (2) the value of force arm is generally an integer, which is not representative in finding general rules; (3) it cannot directly show the force arm, causing students to form an incorrect impression of the nature of the force arm, so there is an urgent need to propose a corresponding portable force arm dynamic teaching device to solve the above problems. UTILITY MODEL CONTENTS
[0005] The utility model aims at: in order to solve the above -mentioned problem, and propose a portable force arm dynamic teaching device.
[0006] In order to achieve the above object, the utility model adopts the following technical scheme:
[0007] A portable force arm dynamic teaching device, comprising a track, a spring dynamometer, a gravity weight, a fixed plate and an installation assembly for installing the fixed plate, the front end surface of the fixed plate is rotatably connected with a tape measure, the front end surface of the tape measure is fixedly connected with a force arm ruler, the tape measure and the track are integrated with a force arm display assembly, the transparent sliding sleeve is integrated on both sides of the force arm ruler, and the spring dynamometer and the gravity weight are connected with two groups of transparent sliding sleeves respectively.
[0008] Preferably, the inner surface walls on both sides of the vertical ends of the two groups of transparent sliding sleeves are integrated with rolling balls, the outer surface walls of the rolling balls abut against the outer surface walls of the force arm ruler, and the top portions of the two groups of transparent sliding sleeves are integrated with fixed portions fixed with the force arm ruler.
[0009] Preferably, the fixed portions comprise positioning rods screwed with the inner surface walls of the top portions of the transparent sliding sleeves, and the open ends of the positioning rods abut against the top portions of the force arm rulers.
[0010] Preferably, the bottom portions of the two groups of transparent sliding sleeves are fixedly connected with circular rings through connecting ropes.
[0011] Preferably, the force arm display assembly comprises a fixedly connected track and a sealing plate, the inner surface walls of the track are slidingly connected with universal bearing wheels, the inside of the leather tape ruler is integrated with a flexible ruler, and the open end of the flexible ruler is hung on the outer surface walls of the universal bearing wheels.
[0012] Preferably, the mounting assembly comprises a magnetic base fixedly connected with the fixed plate through fasteners.
[0013] As described above, the beneficial effects of the present application are as follows:
[0014] 1. In the present application, the cooperation of the magnetic base and the fixed plate enables the device to be placed flat on the desktop or to be adsorbed to the blackboard, and the inclined spring dynamometer can be used, and the size and direction of the leather tape ruler can be automatically changed by changing the orientation of the track. Students can directly observe the entire change process of the force arm and complete the reading of the force arm. Through the inclined spring dynamometer, it is found that the size of the reading changes, but the distance between the action point and the fulcrum does not change. The existence of the force arm is realized, and the nature of the force arm is truly understood.
[0015] 2. In the present application, on the basis of directly demonstrating the force arm, it is found that the force arm also changes when the direction of the rotating power changes. In addition, students are guided to take the roller as the research object to analyze the stress, and it is found that the support force of the track to the roller and the pulling force of the leather tape ruler to the roller are a pair of balanced forces. Since the support force is always perpendicular to the contact surface, by using the knowledge of two-force balance, it is easy to find that the pulling force is also always perpendicular to the track. Finally, it is concluded that the force arm represented by the leather tape ruler is always perpendicular to the action line of the force represented by the track. Therefore, students can understand the force arm from the perspective of the distance from a point to a straight line, and it is concluded that the nature of the force arm is the distance from the fulcrum to the action line of the force. Through the complete dynamic process, the change process of the force arm is directly observed visually, which helps students to establish the correct first impression in their brains and form the physical model of the force arm.
[0016] 3、In the application, the inner surface walls on both sides of the vertical ends of the two groups of transparent sliding sleeves are fixedly connected with the ball bearings, so as to reduce the friction between the sliding sleeve and the force arm ruler, ensure the smoothness of the sliding of the sliding sleeve, and rotate the positioning rod to be screwed with the inner surface wall of the top of the transparent sliding sleeve until the open end of the positioning rod abuts against the top of the force arm ruler, so that the rapid positioning of the sliding sleeve is realized through the friction force, and the stability of the left and right groups of force application positions is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 An overall structure schematic diagram is shown according to an embodiment of the present application.
[0018] Figure 2 A universal bearing wheel structure schematic diagram is shown according to an embodiment of the present application.
[0019] Figure 3 A transparent sliding sleeve structure schematic diagram is shown according to an embodiment of the present application.
[0020] Figure 4 A positioning rod structure schematic diagram is shown according to an embodiment of the present application.
[0021] LEGEND:
[0022] 1, force arm ruler; 2, magnetic base; 3, fixed plate; 4, tape measure; 5, track; 6, flexible ruler; 7, transparent sliding sleeve; 8, connecting rope; 9, spring dynamometer; 10, gravity weight; 11, universal bearing wheel; 12, sealing plate; 13, positioning rod; 14, ball bearing. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0024] Please refer to Figures 1-4 The present application provides a technical solution:
[0025] A portable force arm dynamic demonstration device, comprising a track 5, a spring dynamometer 9, a gravity weight 10, a fixed plate 3 and a mounting assembly for mounting the fixed plate 3, the front end surface of the fixed plate 3 is rotatably connected with a tape measure 4, the front end surface of the tape measure 4 is fixedly connected with a force arm ruler 1, a force arm display assembly is integrated between the tape measure 4 and the track 5, the horizontal two sides of the force arm ruler 1 are integrally provided with transparent sliding sleeves 7, and the spring dynamometer 9 and the gravity weight 10 are connected with the two groups of transparent sliding sleeves 7 respectively.
[0026] The cooperation of the magnetic base 2 and the fixed plate 3 makes the device as a whole can be placed on the desktop, and can also be adsorbed to the blackboard, and the inclined spring dynamometer 9 can be used, and the track 5 can be changed in direction, and the tape measure 4 can automatically change in size and direction, the students can directly observe the whole change process of the force arm, and complete the reading of the force arm, and find that the reading size changes through the inclined spring dynamometer 9, and the distance between the action point and the fulcrum does not change, realize the existence of the force arm, and truly understand the nature of the force arm, on the basis of directly demonstrating the force arm, the direction of the rotating power is found, and it is found that the force arm also changes, in addition, the students are guided to take the roller as the research object to analyze the stress, and it is found that the support force of the track 5 to the roller and the pulling force of the tape measure 4 to the roller are a pair of balanced forces, since the support force is always perpendicular to the contact surface, by using the knowledge of two-force balance, it is easy to find that the pulling force is always perpendicular to the track 5, and finally it is concluded that the force arm represented by the tape measure 4 is always perpendicular to the action line of the force represented by the track 5, so as to help the students understand the force arm from the mathematical point of view of the distance from the point to the straight line, and it is concluded that the nature of the force arm is the distance from the fulcrum to the action line of the force, through the complete dynamic process, the change process of the force arm is directly observed by the vision, and the students are helped to establish the correct first impression in the brain, and form the physical model of the force arm.
[0027] Specifically, as shown in Figure 2 and Figure 4 The outer surface wall of the ball 14 is in abutment with the outer surface wall of the force arm ruler 1, and the top of the two groups of transparent sliding sleeves 7 is integrally formed with a fixed part fixed with the force arm ruler 1, the fixed part includes a positioning rod 13 in screw connection with the inner surface wall of the top of the transparent sliding sleeve 7, and the open end of the positioning rod 13 is in abutment with the top of the force arm ruler 1, the inner surface wall of the vertical end of the two groups of transparent sliding sleeves 7 is fixedly connected with the ball 14, so as to reduce the friction between the sliding sleeve and the force arm ruler 1, ensure the smoothness of the sliding of the transparent sliding sleeve 7, and rotate the positioning rod 13 to make it in screw with the inner surface wall of the top of the transparent sliding sleeve 7, until the open end of the positioning rod 13 is in abutment with the top of the force arm ruler 1, so as to realize the rapid positioning of the transparent sliding sleeve 7 through the friction force, and ensure the stability of the left and right two force application positions.
[0028] Specifically, as shown in Figure 2 and Figure 3As shown, the bottom of the two sets of transparent sliding sleeve 7 is fixedly connected with a ring through connecting rope 8, and the structure characteristics of the spring force gauge 9 and the gravity weight 10 ensure the convenience of disassembly and assembly of the spring force gauge 9 and the gravity weight 10. The force arm display assembly includes the fixedly connected track 5 and the sealing plate 12. The universal bearing wheel 11 is slidably connected to the inner wall of the track 5. The soft ruler 6 is integrated in the inside of the leather tape 4. The open end of the soft ruler 6 is hung on the outer wall of the universal bearing wheel 11. The inclined pull spring force gauge 9 changes the orientation of the track 5, and the leather tape 4 automatically changes the size and direction. Students can directly observe the entire change process of the force arm and complete the reading of the force arm at the same time. The installation assembly includes the magnetic base 2, which is fixedly connected with the fixed plate 3 through fasteners, so that the device can be placed on the desktop or adsorbed to the blackboard.
[0029] Working principle: the cooperation of the magnetic base 2 and the fixed plate 3 makes the device as a whole can be placed on the desktop or adsorbed to the blackboard. The inclined pull spring force gauge 9 changes the orientation of the track 5, and the leather tape 4 automatically changes the size and direction. Students can directly observe the entire change process of the force arm and complete the reading of the force arm at the same time. Through the inclined pull spring force gauge 9, it is found that the size of the reading changes, but the distance between the action point and the fulcrum does not change. The existence of the force arm is realized, and the nature of the force arm is truly understood. On the basis of directly demonstrating the force arm, it is found that the force arm will also change when the direction of the rotating power changes. In addition, students are guided to take the roller as the research object to analyze the stress, and it is found that the support force of the track 5 to the roller and the pulling force of the leather tape 4 to the roller are a pair of balanced forces. Since the support force is always perpendicular to the contact surface, by using the knowledge of two-force balance, it is easy to find that the pulling force is always perpendicular to the track 5. Finally, it is concluded that the force arm represented by the leather tape 4 is always perpendicular to the action line of the force represented by the track 5. Thus, students can understand the force arm from the mathematical point of view, that is, the distance from the point to the straight line, and it is concluded that the nature of the force arm is the distance from the fulcrum to the action line of the force. Through the complete dynamic process, the change process of the force arm is directly observed through the vision, which helps students to establish the correct first impression in the brain, form the physical model of the force arm, and the inner walls of the vertical ends of the two sets of transparent sliding sleeve 7 are fixedly connected with the ball 14, which reduces the friction between the sleeve and the force arm ruler 1, ensures the smoothness of the sliding of the transparent sliding sleeve 7, and can rotate the positioning rod 13 to make it rotate with the inner wall of the top of the transparent sliding sleeve 7, until the open end of the positioning rod 13 abuts against the top of the force arm ruler 1. In this way, the rapid positioning of the transparent sliding sleeve 7 is realized through the friction force, so as to ensure the stability of the left and right force application positions.
[0030] The foregoing description of the embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A portable force arm dynamic demonstration device, comprising a track (5), a spring dynamometer (9), a gravity weight (10), a fixed plate (3) and a mounting assembly for mounting the fixed plate (3), characterized in that, The fixed plate (3) front end surface rotationally connected with the leather tape (4), the leather tape (4) front end surface fixedly connected with the force arm ruler (1), the leather tape (4) and the track (5) between integrated for force arm display assembly, the force arm ruler (1) horizontal both sides are integrated with transparent slide sleeve (7), the spring dynamometer (9) and the gravity weight (10) are connected with two groups of transparent slide sleeve (7) respectively.
2. The portable force arm dynamic teaching device according to claim 1, wherein, Two groups of the transparent slide sleeve (7) vertical end both sides inner wall are integrated with the ball (14), the ball (14) outer wall and the force arm ruler (1) outer wall abut, and two groups of the transparent slide sleeve (7) top are integrated with the fixed part of force arm ruler (1) fixed.
3. The portable force arm dynamic teaching device according to claim 2, characterized in that, The fixed part includes the positioning rod (13) with the transparent slide sleeve (7) top inner wall screw connection, and the positioning rod (13) open end abuts in the force arm ruler (1) top.
4. The portable force arm dynamic teaching device according to claim 3, characterized in that, Two groups of the transparent slide sleeve (7) bottom are fixedly connected with the circular ring through the connecting rope (8).
5. The portable force arm dynamic teaching device according to claim 4, wherein, The force arm display assembly includes fixedly connected track (5) and sealing plate (12), the track (5) inner wall is connected with universal bearing wheel (11), the leather tape (4) inside integrated with soft ruler (6), the soft ruler (6) open end is hung in the universal bearing wheel (11) outer wall.
6. The portable force arm dynamic teaching device according to claim 5, wherein, The installation assembly includes the magnetic base (2), the magnetic base (2) is fixedly connected with the fixed plate (3) through fastener.