Numerical control lever principle science popularization demonstration and teaching device with arbitrarily adjustable force arms on two sides

Abstract

The utility model discloses a numerical control lever principle science popularization demonstration teaching device with randomly adjustable force arms at two sides, relates to the technical field of lever principle science popularization demonstration teaching, and solves the problems that force and force arms related to an existing lever principle science popularization demonstration teaching device are not digitally expressed, an operator cannot perform quantitative calculation according to a lever principle formula, and the teaching efficiency is high. The technical problems that the experience feeling is not strong, participants cannot exchange game roles, an attack and defense relationship is formed, and the interactivity is poor are solved; comprising a fixed stand column and balance arms hinged to the fixed stand column through pin shafts, and the balance arms are bilaterally symmetrical along the center line of the fixed stand column. According to the utility model, real-time digital display of the force and the force arm required by the lever principle science popularization demonstration and teaching device can be realized, numerical control automatic adjustment of the position of the force arm is realized, the purpose of balancing the lever is achieved, two-person game role interchange can be realized, an attack and defense relationship is formed, and the interactive experience feeling is strong.

Description

Technical Field

[0001] The utility model belongs to the technical field of science popularization and education of lever principle, and particularly relates to a digitally controlled science popularization and education device of lever principle with arbitrarily adjustable double-side force arms. Background Art

[0002] The ancient Greek scientist Archimedes proposed the lever principle in On the Balance of Plane Figures: When two objects are balanced, their distance from the fulcrum is inversely proportional to their weight. In the Warring States Period, Mozi also discussed the balance of levers in Mozi Jingshuoxia: "When you add weight to one side of a balance, you must hit it, and the weights are similar. When they are balanced, the base is short and the standard is long. If the weights added are similar, the standard must go down, and the standard is balanced.

[0003] At present, the existing lever principle science popularization and teaching devices are mainly divided into the following two categories under the premise of fixing the hinge point:

[0004] (1) Under the premise of constant load force, the operator adjusts the lever arm by changing the position in a coordinated manner to explore the lever arm position required for the lever balance point. A typical example is the seesaw type. The specific solution is: the operators on both sides coordinate to adjust their distance from the hinge point according to their own weight, so as to achieve the lever balance effect. This device does not have a digital real-time display of the force and lever arm values. The operator needs to explore the lever arm position required for lever balance by coordinating the position.

[0005] (2) Multiple sets of fixed-distance force arms are formed by coaxial fixed pulleys and several fixed pulleys with different distances from the same side of the fixed hinge support, and the balance point is obtained by the change of corresponding tension. The specific scheme is as follows: a set of coaxial fixed pulleys is arranged on the left side, and a reversing fixed pulley system is formed with fixed pulleys 1, 2, and 3 through three traction ropes 1, 2, and 3, respectively. The load at F1 can be a fixed load or the operator's own weight, and the load at F2, F3, and F4 is the tension of another operator. L1, L2, L3, and L4 are corresponding force arms, respectively. Since the left-side load F1 and force arm L1 are fixed, the operator can experience the change of the required tension through the change of different force arms L2, L3, and L4, and understand the principle of lever. Among them, in the above structure, a digital tension sensor can also be added to display the tension values ​​at F1, F2, F3, and F4 in real time. Although the device can display the tension value after being equipped with a digital tension sensor, its lever arm is fixed in grades and cannot be adjusted to any position. Moreover, due to the asymmetry of the structure, the relationship between the lever arm change and the force can only be experienced on one side, resulting in poor interactivity.

[0006] In summary, the above schemes either do not realize digital real-time display of the force and lever arm of the lever principle or can only realize digital real-time display of the force under the premise of fixed lever arms. The operator cannot obtain the corresponding lever balance position by calculating according to power × power arm = resistance × resistance arm through real-time force and lever arm data while arbitrarily changing the positions of the lever arms on both sides. Automatic and precise positioning of lever arm adjustment is not realized, and the operator is limited by height and strength, resulting in a poor participation experience.

[0007] Therefore, based on the above problems, we designed a CNC lever principle science popularization and education device with arbitrarily adjustable double-sided force arms. Utility Model Content

[0008] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a digitally controlled lever principle science popularization and education device with adjustable double-sided force arms, which solves the technical problems that the force and force arm involved in the existing lever principle science popularization and education device are not digitally expressed, the operator cannot perform quantitative calculations according to the above formula, and the correctness of the calculation results can be verified and statistically scored, the experience is not strong, the participants cannot exchange game roles, form an offensive and defensive relationship, and the interactivity is poor.

[0009] To achieve the above-mentioned purpose, according to the embodiment of the first aspect of the utility model, a CNC lever principle science popularization and education device with arbitrarily adjustable double-sided force arms is provided, comprising a fixed column, a balancing arm hinged to the fixed column through a pin shaft;

[0010] Among them, the balance arm is symmetrical along the center line of the fixed column;

[0011] It also includes: a pair of ball screws, which are symmetrically arranged on the top surfaces of the two cantilever sections of the balance arm, each of the ball screws is threaded with a slide, each slide is provided with a weighing sensor, and the balance arm is provided with a sliding column frame respectively connected to each slide.

[0012] A further improvement is that the device also includes a pair of operating compartments and a PLC control box arranged in the operating compartments, each of the operating compartments is respectively connected to each sliding column frame, and each operating compartment is equipped with a touch screen.

[0013] A further improvement is that each of the ball screws is driven separately by a motor arranged on the balance arm, and the main shaft end of each motor is connected to each ball screw through a coupling. The ball screw can be driven to rotate by the rotation of a separate motor, so that each operating bin, sliding column frame, slide table and weighing sensor can be moved and adjusted separately.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model can realize the real-time digital display of the force and lever arm required for the popular science exhibition and teaching device of the lever principle, and realize the digital automatic control of the lever arm, so that the lever arms on both sides can be arbitrarily adjusted. The operator can calculate the required balancing lever arm according to power×power arm=resistance×resistance arm, and then drive the electric ball screw slide system to adjust the lever arm position to achieve the purpose of balancing the lever. The exhibition and teaching device can realize the role exchange of two people in the game to form an attack and defense relationship, and the interactive experience is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the science popularization and teaching device based on the improved lever principle of the utility model;

[0017] Markings in the figure:

[0018] 1. Operation compartment; 2. Sliding column frame; 3. Balance arm; 4. Motor; 5. Coupling; 6. Ball screw; 7. Slide; 8. Weighing sensor; 9. Pin shaft; 10. Fixed column; 11. Touch screen; 12. PLC control box. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 As shown, a CNC lever principle science popularization and teaching device with adjustable bilateral force arms comprises a fixed column 10 and a balancing arm 3 hinged to the fixed column 10 through a pin 9, and the balancing arm 3 is symmetrical along the center line of the fixed column 10;

[0021] like Figure 1 As shown, the implementation also includes: a pair of ball screws 6, which are symmetrically arranged on the top surfaces of the two cantilever sections of the balance arm 3, each ball screw 6 is threaded with a slide 7, each slide 7 is provided with a weighing sensor 8, and the balance arm 3 is provided with a sliding column frame 2 respectively connected to each slide 7;

[0022] A pair of operating compartments 1 and a PLC control box 12 arranged in the operating compartments 1, each operating compartment 1 is respectively connected to each sliding column frame 2, and each operating compartment 1 is equipped with a touch screen 11;

[0023] Each ball screw 6 is driven separately by a motor 4 arranged on the balance arm 3. The main shaft end of each motor 4 is connected to the end of each ball screw 6 through a coupling 5. During implementation: due to the difference in individual weight of the operators, the force on both sides of the lever is different. By rotating a separate motor 4, the ball screw 6 is driven to rotate, so that each operating bin 1, sliding column frame 2, slide 7 and weighing sensor 8 can be moved and adjusted separately, and the bilateral force arms can be adjusted to different positions at will. Another person calculates the required balance force arm according to the lever principle formula: power × power arm = resistance × resistance arm based on the real-time force and force arm values ​​displayed on the touch screen 11, and then levels the device according to the above method.

[0024] like Figure 1 As shown, in the present embodiment, it should be noted that, when the present application document is implemented, the operator fixes the bottom of the fixed column 10 to the ground by bolts, and connects the top to the balance arm 3 by a pin 9 to form a hinge fulcrum. The motor 4, the coupling 5, the ball screw 6 and the slide 7 constitute an electric ball screw slide system, which is fixed to the upper wing surface of the balance arm 3 by bolts as a whole. With the center line of the fixed column 10 as a reference, one is arranged symmetrically on the left and one on the right. A weighing sensor 8 is arranged on the upper part of the slide 7. The sliding column frame 2 is a U-shaped or L-shaped structure. The top pressure plate is bolted to the slide 7 through the weighing sensor 8. The operating compartment 1 is arranged at the lower part of the sliding column frame 2. A touch screen 11 connected to the PLC control box 12 in the PLC control box 12 is provided in the operating compartment 1.

[0025] Among them, the motor 4 can be a stepper motor or a servo motor, equipped with an encoder connected to the PLC control box 12, and drives the ball screw 6 through the coupling 5 to drive the slide 7 to move horizontally and linearly, thereby realizing precise position control of the sliding column frame 2 and the operating compartment 1, forming an arbitrarily variable force arm.

[0026] The weighing sensor 8 measures the load weight of the sliding column frame 2 and the operating chamber 1 in real time, and transmits the measured value to the touch screen 11 through the PLC control box 12 for display.

[0027] The touch screen 11 communicates with the PLC control box 12 to receive signals from the weighing sensor 8 and the encoder configured for the motor 4, and displays the load force data on both sides of the lever and the position of the slide 7 in real time, thereby realizing real-time digital display of the force and the lever arm. In addition, based on the lever arm related data input by the touch screen 11, the motor 4 can be driven to drive the slide 7 to realize horizontal linear movement of the sliding column frame 2 and the operating compartment 1, thereby realizing digital automatic control of the lever arm.

[0028] A PLC control panel is provided in the PLC control box 12, and a control program is pre-implanted in the PLC control panel, that is, a lever principle verification program (power×power arm=resistance×resistance arm) and a competition statistics and scoring system are preset in the PLC control box 12. This part can be pre-set before implementation. It is the principle setting of the prior art and has been omitted in this application.

[0029] In addition, the application document only improves the shortcomings of the existing lever principle popular science education device, that is, the force and lever arm involved are not digitally expressed, the operator cannot quantify the calculation according to the above formula, and verify and statistically score the correctness of the calculation results, the experience is not strong, the participants cannot exchange game roles, form an offensive and defensive relationship, and the interactivity is poor, but does not involve other aspects;

[0030] The overall working principle of this CNC lever principle popular science teaching device with arbitrarily adjustable double-sided force arms is introduced as follows:

[0031] During operation, two operators enter the left and right operating chambers 1 respectively, one person inputs the proposed position parameters of the double-sided slide 7 through the touch screen 11, and drives the slide 7 to move horizontally and linearly through the PLC control box 12 to achieve the initial positioning of the double-sided operating chamber 1 and establish the initial force arm position. The other person needs to calculate the corresponding balance force arm data according to the weight load value measured by the double-sided weighing sensor 8 and the real-time position data of the double-sided slide 7 displayed on the touch screen 11 in the operating chamber 1, according to the lever principle: power × power arm = resistance × resistance arm. If the calculation is wrong after entering the touch screen 11, the preset lever principle verification program in the PLC control box 12 will trigger an alarm until the parameters are correct, and the required side slide 7 will be driven to move horizontally and linearly, driving the corresponding side sliding column frame 2 and the operating chamber 1 to the corresponding position to achieve the purpose of balancing the lever. The built-in competition statistics and scoring program in the PLC control box 12 can count the calculation results and transmit them to the touch screen 11 for display in real time to increase the fun.

[0032] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A science popularization and teaching device for the principle of a numerically controlled lever with adjustable double-sided force arms, characterized in that: It comprises a fixed column (10) and a balancing arm (3) hinged to the fixed column (10) via a pin shaft (9); The balancing arm (3) is symmetrical along the center line of the fixed column (10); The invention also comprises: a pair of ball screws (6) symmetrically arranged on the top surfaces of the two cantilever sections of the balancing arm (3); a slide table (7) is threadedly sleeved on each of the ball screws (6); a weighing sensor (8) is arranged on each slide table (7); and a sliding column frame (2) is arranged on the balancing arm (3) and is respectively connected to each slide table (7).

2. The device for popularizing and teaching the principle of a CNC lever with adjustable double-side lever arms according to claim 1, characterized in that: The device further comprises a pair of operating chambers (1) and a PLC control box (12) arranged in the operating chambers (1); each of the operating chambers (1) is respectively connected to each sliding column frame (2); and each operating chamber (1) is provided with a touch screen (11).

3. The device for popularizing and teaching the principle of a CNC lever with adjustable double-side lever arms according to claim 1, characterized in that: Each of the ball screws (6) is driven individually by a motor (4) arranged on the balance arm (3); the main shaft end of the motor (4) is connected to each ball screw (6) via a coupling (5).

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